PART 3 - EXECUTION

Bicol International Airport Development Project Division 15 - Mechanical Section VI- Technical Specifications Unitary Air Conditioning (Split-Type) Systems

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PART 3 - EXECUTION 3.1 INSTALLATION

Application and installation practices for unitary air-conditioning systems shall conform to the requirements of ARI 260.

3.1.1 General

Install equipment and components in a manner to insure proper and sequential operation of the equipment and its control. Installation of equipment not covered herein or in the manufacturer's representative. Provide proper foundations for mounting of equipment, accessories, appurtenances, piping and controls including, but not limited to, supported vibration isolators, stands, guides, anchors, clamps and brackets. Foundations for equipment shall conform to equipment manufacturer's recommendation, unless otherwise shown on the drawings. Set anchor bolts and sleeves accurately using properly constructed templates. Anchor bolts shall be of adequate length and provided with welded-on plates on the head end embedded in the concrete. Level equipment bases, using jacks or steel wedges, and neatly grouted-in with a non-shrinking type of mortar grout. Locate equipment so that working space is available for all necessary servicing such as shaft removal, disassembling compressor cylinders and pistons, replacing or adjusting drives, motors, or shaft seals, access to water valves and head of shell and tube equipment, tube cleaning or replacement, access to automatic controls, refrigerant charging, lubricator, oil draining and working clearance under overhead lines. Provide electric isolation between dissimilar metals for the purpose of minimizing galvanic corrosion.

3.1.2 Air Conditioning System

Install system as indicated, in accordance with the requirements of ASHRAE 15-78, and as recommended in the manufacturer's installation and operational instructions.

3.1.3 Electrical Work

Electric motor driven equipment specified herein shall be provided complete with motors, motor starters, and controls. Electrical equipment and wiring shall be provided with complete "Interior Wiring Systems". Motor starters shall be provided complete with properly sized thermal overload protection and other appurtenances necessary for the motor control specified. Provide manual or automatic control and protective devices required for the operation, herein specified and any control wiring required for controls and devices but not indicated.

3.1.4 Refrigerant Piping

Piping and fitting installation shall conform to the requirements of ASME B31.1. Pipe shall be cut accurately to measurements established at the jobsite, and worked into place without springing or forcing, completely clearing all windows, doors, and other openings. Cutting or other weakening of the building structure to facilitate piping installation will not be permitted without written approval. Pipe or tubing shall be cut square, shall have burrs removed by reaming, and shall permit free expansion and contraction without causing damage to the building structure, pipe, joints, or hangers. Changes in direction shall be made with fittings, except that bending of pipe 100 mm (4 inches) and smaller will be permitted, provided a pipe bender is used and wide weep bends are formed. Mitering or notching pipe or other similar construction to form elbows or tees will not be permitted. The centerline radius of bends shall not be less than 6 diameters of the pipe. Bent pipe showing kinks wrinkles, flattening, or other malformations will not be accepted. Piping shall be installed 4 mm per m (1/2 inch per 10 feet) of pipe in the direction of flow to ensure adequate oil drainage. Open ends of refrigerant lines or equipment shall be properly capped or plugged during installation to keep moisture, dirt, or other foreign material out of the system. Piping shall remain capped until installation. Equipment piping shall be in accordance with the equipment manufacturer's recommendations and the contract drawings. Equipment and piping arrangements shall fit


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into space allotted and allow adequate acceptable clearances for installation, replacement, entry, servicing, and maintenance.

3.1.5 Fans

Installation shall conform to NFPA 91, and SMACNA Round Industrial Duct Construction Standards, and SMACNA Rectangular Industrial Duct Construction Standards. Provide mounting and supports for equipment and accessories, including structural supports, hangers, vibration isolators, stands, clamps and brackets, access doors, and dampers. Install accessories in accordance with manufacturer's instructions.

a. Installation of Supports b. Selection

Selection of equipment support system shall take into account the best practice recommendations and requirements of SMACNA Round Industrial Duct Construction Standards, SMACNA Rectangular Industrial Duct Construction Standards, and NEFA 91; location and precedence of work under other sections; interferences of various piping and electrical work; facility equipment; building configuration; structural and safety factor requirements; vibrations and imposed loads under normal and abnormal service conditions. Indicated support sizes, configurations, and spacing are the minimal type of supporting component required for normal loads. Where installed loads are excessive for the normal support spacing, provide heavier duty components or reduce the element spacing. After system start-up, replace or correct support elements, which vibrate and cause noise or possible fatigue failure. Exercise special care to prevent cascading failure.

3.2 FIELD TESTS AND INSPECTIONS 3.2.1 Tests

All tests shall be performed and the Contractor shall furnish materials and equipment required for test. Tests after installation and prior to acceptance shall be performed in the presence of the Engineer and subject to his approval. Equipment and material certified as having been successfully tested by the manufacturer in accordance with referenced specifications and standards will not require retesting before installation. Equipment and materials not tested at the place of manufacturer will be tested before or after installation, as applicable, where necessary to determine compliance with referenced specifications and standards.

a. Leak Testing

Upon completion of installation of the air conditioning equipment, test all factories as well as field refrigerant piping with an electronic-type leak detector to acquire leak tight refrigerant systems. If leaks are detected at the time of installation or during the guarantee period, remove the entire refrigerant charge from the system, correct the leaks and retest the system.

b. Evacuation, Dehydration, and Charging

After system is found to be without leaks, evacuate the system using a reliable gage and a vacuum pump capable of pulling a vacuum of at least 1 mm Hg absolute. Evacuate system in strict accordance with the triple-evacuation and blotter method or in strict accordance with equipment manufacturer's printed instructions. System leak testing, evacuation, dehydration, and charging with refrigerant shall comply with the requirements contained in ARI Standard 260.


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c. Start-Up and Operation Tests

Follow the manufacturer's start-up and initial operation procedures and place the system under all modes of operation to ensure that it is functioning correctly. Adjust safety and automatic control instruments as necessary to ensure proper operation and sequence. Initial operation period shall be not less than 8 hours.

d. Performance Tests

Upon completion of evacuation, charging, start-up, final leak testing, and proper adjustment of controls, the system shall be performance tested to demonstrate that it complies with the performance and capacity requirements of the specifications and plans. Test the system for not less than 8 hours, during which time hourly readings shall be recorder. At the end of the test period, the readings shall be averaged and the average shall be considered to be the system performance.

4.0 METHOD OF MEASUREMENT

Indoor unit and outdoor unit, refrigerant piping and other piping accessories shall be either counted or measured in linear meters, actually installed and accepted to the satisfaction of the Engineer.

5.0 BASIS OF PAYMENT

The quantities determined as provided in Method of Measurement, shall be paid for at the contract unit price, respectively for each of the Pay Items listed below and shown in the Bill of Quantities, which price and payment shall be full compensation for furnishing and placing all materials, including all labor, equipment, tools and incidentals necessary to complete the work prescribed in this Section.

Payment will be made in accordance with the Bill of Quantities.

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Bicol International Airport Development Project Division 15 - Mechanical Section VI- Technical Specifications Air-Cooled Water Chillers

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SECTION 15682 - AIR-COOLED WATER CHILLERS PART 1 - GENERAL 1.1 SECTION INCLUDES

a. Chillers b. Charge of refrigerant and oil c. Controls and control connections d. Chilled water connections e. Starters f. Electrical power connections

1.2 SUBMITTALS

a. Submit drawings indicating components, assembly, dimensions, weights and loadings, required clearances, and location and size of field connections. Indicate accessories where required for a complete system.

b. Submit product data indicating rated capacities, weights, specialties and accessories,

electrical requirements and wiring diagrams. c. Submit manufacturer's installation instructions.

1.3 OPERATING AND MAINTENANCE

a. Submit operation data. b. Include start-up instructions, maintenance data, controls, and accessories. c. Submit manufacturer's installation instructions.

1.4 REGULATORY REQUIREMENTS

a. Conform to ANSI/ARI 590 or ANSI/ARI 550. b. Conform to ANSI/ASME SEC 8 for construction and testing of water chillers. c. Conform to ANSI/ASHRAE 15 code for construction and operation of water chillers.

1.5 STORAGE AND HANDLING

a. Comply with manufacturer's installation instructions for rigging, unloading, and transporting units.

b. Protect units from physical damage. Factory coil shipping covers shall be kept in place

until installation.

c. Unit controls shall be capable of withstanding 203 degrees F (95 degrees C) storage temperatures in the control compartment for an indefinite period of time.

1.6 WARRANTY

a. Provide a full parts warranty for one year from start-up or 18 months from shipment, whichever comes first.


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b. Provide five-year warranty for replacement compressors including materials and labor.

PART 2 - PRODUCTS 2.1 PACKAGED AIR COOLED CHILLERS 2.1.1 General Unit Description

Provide factory assembled, designed and tested air-cooled liquid chillers consisting of helical rotary screw compressors, condenser, evaporator, thermal or electronic expansion valve, refrigeration accessories, starter, and control panel. Construction and ratings shall be in accordance with ANSI/ARI 550.

2.1.2 Compressors

a. Construct multiple rotary screw compressors with heat treated forged steel or ductile iron shafts, aluminum alloy connecting rods, automotive type pistons, rings to prevent gas leakage, discharge valves, and sealing surface immersed in oil. Rotors shall be of high-grade steel or cast iron alloy.

b. Statically and dynamically balance rotating parts. c. Provide oil lubrication system with oil charging valve and oil filter to

ensure adequate lubrication during starting, stopping, and normal operation. d. Provide compressor with automatic capacity reduction equipment consisting of suction

capacity control slide valve (rotary). Use lifting mechanism operating by oil pressure. Compressor must start unloaded for soft start on motors.

e. Provide constant speed 1800 rpm compressor motor, suction gas cooled with solid-

state sensor and electronic winding overheating protection, designed for across the line or star delta starting. Furnish with starter. Compressor motor power factor shall be .90 or greater. If the compressor motor power factor is less than 0.90, power factor correction capacitors must be installed.

f. Provide crankcase heater to evaporate refrigerant returning to crankcase during

shutdown. Energize heater when compressors is not operating. g. Refrigerants shall be ozone friendly of the HCFCs or the HFCs-134A type. CFCs will

not be accepted.

2.1.3 Evaporators

a. Provide shell and tube type evaporator, seamless or welded steel construction with cast iron or fabricated steel heads; seamless internally finned copper tubes, roller expanded into tube sheets. Copper tubes shall be removable from each end by removing cover plates or head.

b. Design, test, and stamp refrigerant side for 300 psig (2,068 kPa) working pressure and

water side for 25 psig (1,482 kPa) working pressure, in accordance with ANSI/ASME SEC 8.

c. Insulate with 0.75-inch (20 mm) minimum thick flexible elastomeric rubber closed cell

insulation with maximum K value of 0.26

d. Provide water drain connection, vent and fittings for factory installed leaving water temperature control and low temperature cutout sensors.


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e. Water connection shall be victaulic. Evaporator shall have only one entering and one leaving connection. If manufacturer shall provide manifold and pressure gauges to ensure equal flow is provided to each evaporator.

2.1.4 Condenser

Extended-surface fin-and-tube type condenser construction. Condenser coils shall be constructed of copper tubes and aluminum fins. Fins shall be hydraulically or mechanically bonded to tubes and installed in a metal casing. Coils shall be circuited and sized for a minimum of minus 15 degrees C (5 degrees F) sub-cooling and full pump down capacity. Provide a coating as specified in the paragraph entitled "Coatings for Finned Tube Coils." Coils to be coated shall be part of the manufacturer's standard product for the capacities and ratings indicated and specified. Fins shall be plate type.

2.1.5 Enclosures

a. House components in 12 gauges galvanized steel frame and mounted on welded structural steel base. Hot dip galvanized steel frame coating shall be UL recognized as G90-U, UL Guide No.DTHW2.

b. Unit panels and control panels shall be finished with a baked on powder plant. Control

panel doors shall have door stays. Paint system shall meet the requirements for outdoor equipment of federal government policies.

c. Provide factory mounted 4 inch square, heavy wire mesh access guards that covers

the service area beneath the condenser coils. d. Mount starters and disconnects in weatherproof panel provided with full access doors.

Provide lockable disconnect operating handle external to panel and clearly visible from outside of unit indicating if power is on or off.

e. Casings fabricated from steel that do not have a zinc coating conforming to ASTM

A123 or ASTM A525 shall be treated for the prevention of corrosion with a factory coating or paint system. The coating or paint system shall withstand 500 hours in a salt spray fog test in accordance with ASTM B117. Each specimen shall have a standard scribe mark as defined in ASTM D1654. Upon completion of exposure, the coating or paint system shall be evaluated and rated in accordance with procedures A and B of ASTM D1654. The rating of failure at the scribe mark shall not be less than six (average creepage not greater than 1/8 inch). The rating of unscribed area shall not be less than ten (no failure). Thickness of coating or paint system on the actual equipment shall be identical to that on the test specimens with respect to materials, conditions of application, and dry film thickness.

2.1.6 Refrigerant Circuit

a. All units shall have an independent refrigeration circuits, each with one compressor on each circuit.

b. Provide for each refrigerant circuit: (1) Liquid line shutoff valve. (2) Filter dryer (replaceable core type). (3) Liquid line sight glass and moisture indicator.

(4) Electronic or thermal expansion valve sized for maximum operating pressure. (5) Charging valve.

(6) Discharge and oil line check valves. (7) Compressor suction and discharge service valves. (8) High side pressure relief valve. (9) Full operating charge service valves. (10) Unit factory leak tested at 200 psig.


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c. Capacity Modulation: Provide capacity modulation by either slide valve or un-loader valves.

Unit shall be capable of operation down to 15 percent. In the event a manufacturer cannot provide unit with modulation down to 15 percent hot gas bypass must be provided.

2.1.7 Controls

a. On chiller, mount weatherproof control panel, containing starters, power and control wiring, molded case disconnect switch (UL approved) with external lockable operator handle, factory wired with terminal block power connection. Provide single point power connection on units with MCA less than 500 amps.

b. For each compressor, provide across-the-line starter on 460-volt applications. c. Provide the following safety controls with indicating lights or diagnostic readouts.

(1) Low chilled water temperature protection. (2) High refrigerant pressure. (3) Low oil flow protection. (4) Loss of chilled water flow. (5) Contact for remote emergency shutdown. (6) Loss of refrigerant charge protection. (7) Motor current overload. (8) Phase reversal/unbalance/single phasing. (9) Over/undue voltage. (10) Failure of water temperature sensor used by controller. (11) Compressor status (on or off).

d. Provide the following operating controls:

(1) Eight or more step leaving chilled water temperature controller which cycles

compressors and activates slide valve based on PI algorithms. If manufacturer is unable to prove at least eight steps unloading, providing hot gas bypass shall be required.

(2) A Five minute solid state anti-recycle timer to prevent compressor from short

cycling. If a greater than 5-minute solid-state anti-recycle timer is provided, hot gas bypass shall be provided to insure accurate temperature control in light load applications.

(3) Load limit thermostat to limit compressor loading on high return water

temperature to prevent nuisance trip out. (4) High ambient un-loader pressure stat unloads compressors to keep head

pressure under control and help prevent high pressure nuisance trip out on days when outside ambient is above design.

(5) Compressor current sensing un-loader unit that unloads to help prevent current

overload nuisance trip-out. (6) Auto lead-lag functions that constantly evens out running hours and

compressors starts automatically. If manufacturer can not provide this function then cycle counter and hour meter shall be provided for each compressor so Owner can be instructed by the Contractor on how to manually change lead-lag on compressors and even out compressor starts running hours.

(7) Condenser fan sequencing which automatically cycles fans in response to

ambient, condensing pressure and expansion valve pressure differential thereby optimizing unit efficiency.


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e. Provide pre-piped gauge board with pressure gauges for suction and discharge refrigerant pressures on digital display of pressure on microprocessor.

f. Provide ammeters for each compressor or digital display of percent RLA on

microprocessor. g. Provide remote mounted alarm and display panel with a minimum of the following

features:

(1) Leaving chilled water temperature set-point adjustment. (2) Display diagnostic in 2.8 C. (3) Display entering and leaving water temperatures. (4) Display active chilled water and current limit set point. (5) Display ambient temperatures. (6) Display parts failures

(i) Water temperature and ambient temperature sensors (ii) Motor contactors (iii) Unit controller (iv) Condenser and evaporator refrigerant temperature sensors.

2.2 DDC SEQUENCING PANEL

a. General: A microprocessor based control panel shall provide chiller plant control. The control panel shall be factory programmed and require only minimal configuration at the job site. The chiller sequencing software shall incorporate the following features and strategies.

b. Piping System: The sequencing panel shall support single system pump.

c. System Enable: System start shall be initiated by a generic BAS System through the

closure of a set binary contact or by the operator from the DDC Sequencing panel key pad.

d. Set-point Control: The system chilled water set point shall be operator adjustable

through the panel keypad and display.

e. Chilled Water Reset: The sequencing panel software shall provide the option of either load based or ambient based chilled water reset.

f. Soft Loading: A soft loading function shall prevent start of a lag chiller during initial

chilled water loop pull-down for twice the normal delay.

g. Failure Recovery: On failure of the lead chiller, the lag chiller shall be enabled and remain enabled until the lead chiller is back on line.

h. User Interface: The user shall access the system through the panel keypad and display.

System security can be added to prevent unauthorized access to the panel control capabilities.

i. User Display/Adjustments: In addition to setup parameters, the user shall be able to

view and edit (if applicable) the following system information through the panel keypad and display:

(1) System supply water temperature (2) System returns water temperature (3) Active system set point (4) Chiller 1 status (Auto/Manual) (5) Chiller 2, 3, 4 Status (Auto/Manual) (6) System Enable (Auto/Stop)


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PART 3 - EXECUTION 3.1 MANUFACTURER’S FIELD SERVICES

a. Supply service of factory-trained representative for a period of 5 days to supervise testing, startup, and instruction on operation and maintenance to Owner.

b. Supply initial charge of refrigerant and oil. c. Manufacturer to regularly inspect the installation and to check if the work related to the

chiller installation is in accordance to their recommended installation 4.0 METHOD OF MEASUREMENT

Air cooled chillers shall be counted in sets actually installed and accepted to the satisfaction of the Engineer.


The quantities determined as provided in Method of Measurement, shall be paid for at the contract unit price, of the Pay Item listed below and shown in the Bill of Quantities, which price and payment shall be full compensation for furnishing and placing all materials, including all labor, equipment, tools and incidentals necessary to complete the work prescribed in this Section.


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Bicol International Airport Development Project Division 15 - Mechanical Section VI- Technical Specifications Air Handling and Distribution Equipment

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SECTION 15856 - AIR HANDLING AND DISTRIBUTION EQUIPMENT PART 1 - GENERAL 1.1 APPLICABLE PUBLICATIONS

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

1.1.1 Air-conditioning and Refrigeration Institute (ARI) Publications 410-81 Forced-Circulation Air-Cooling and Air-Heating Coils 430-85 Central-Station Air Handling Units 440-84 Room Fan-Coil Air-Conditioners 880-83 Air Terminals 1.1.2 Air Movement and Control Association (AMCA) Publications 210-85 Laboratory Method of Testing Fans for Rating 220-82 Test Method for Air Curtain Units 1.1.3 American Society for Testing and Materials (ASTM) Publications A 123-84 Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products B 117-85 Salt Spray (Fog) Testing 1.1.4 National Electrical Manufacturers Association (NEMA) Publications ICS 2-83 Industrial Control Devices, Controllers and

(Rev. 1-84) Assemblies

ICS 6-83 Enclosures for Industrial Controls and Systems (Rev. 2-86) MG 1-78 Motors and Generators (Including Rev. 1 through Rev. 8) 1.1.5 National Fire Protection Association (NFPA) Publications 90A-85 Installation of Air Conditioning and Ventilating Systems 1.1.6 Underwriters Laboratories Inc. (UL) Publications 883-80 Fan-Coil Units and Room Fan-Heater Units


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1.2 GENERAL REQUIREMENTS Section 15011, “Mechanical General Requirements,” applies to this section with the additions and modifications specified herein.

1.3 WORK INCLUDED a. Packaged Central station air handling units. b. Fan Coils c. Chilled Water Ceiling Cassette Units 1.4 QUALITY ASSURANCE

a. Air Handling Units: Product of manufacturer regularly engaged in production of components who issues complete catalog data on total product offering.

b. Constant/Variable Air Volume Air Handling Units: Certify air volume, static pressure,

fan speed, brake horsepower and selection procedures in accordance with ARI 430. Manufacturer shall be responsible for expenses associated with testing of units after fabrication to verify capacities of fan(s).

c. Air Coils: Certify capacities, pressure drops and selection procedures in accordance

with ARI 410-87.

d. Chilled Water Ceiling Cassette Units: Certify capacities, pressure drops and selection procedures in accordance with ARI 410-87.

1.5 SUBMITTALS 1.5.1 Central station Air Handler, Fan Coil Units.

a. Submit as-built drawings and product data under provisions of Section 15011.

b. As-built drawings shall show total unit configuration in direction of airflow, unit dimensions, and field duct connection details.

c. Product data shall indicate dimensions, weights, coil performance, motor electrical

characteristics, and finishes of materials, filter media, filter sizes, and filter quantities.

d. Submit manufacturer's installation instructions under provisions of Section 15011.

e. Provide fan curves with specified operating point clearly plotted. Fan curves shall indicate air volume, static pressure, fan speed and brake horsepower.

f. Submit sound power levels by octave band for air handling units at scheduled

design conditions. Provide sound power levels for "discharge" and "inlet plus cabinet" sound paths in accordance with AMCA 300 (or ASHRAE 68) and AMCA 301.

1.6 OPERATION AND MAINTENANCE DATA

a. Submit operation and maintenance data under provisions of Section 15011.

b. Include instructions for lubrication, filter replacement, motor and drive replacement, belt tension adjustments, and wiring diagrams. 1.7 DELIVERY, STORAGE, AND HANDLING


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a. Deliver products to site under provisions of Section 15011. Units shall ship fully

assembled on factory-installed base rails up to practical shipping and rigging limitations. Units not shipped fully assembled shall have tags and airflow arrows on each section to indicate location and orientation in direction of airflow. Each section shall have lifting lugs or shipping skid to allow for field rigging and final placement of section.

b. Units shall be cleaned and wrapped at the factory prior to shipment. Cleaning shall

consist of wiping the entire unit down with lint-free wipes using a solution of 80% de-ionized water and 20% isopropyl alcohol. After wipe down, the units shall be double-wrapped in polyethylene to minimize the potential for contamination while in transit or storage.

c. Deliver units to site with fan motors, sheaves, and belts completely assembled and

mounted in units. Mount motors as specified in Article 2.3 Paragraph D and Article 2.4 Paragraph A.

d. Store and protect products under provision of Section 15011.

e. Store wrapped units in clean, dry place and protect from weather and construction

traffic. Handle carefully to avoid damage to components, enclosures and finish. 1.8 ENVIRONMENTAL REQUIREMENTS

Do not operate units for any purpose, temporary or permanent, until ductwork is clean, filters are in place, bearings lubricated and fan has been test run under observation.

1.9 EXTRA STOCK

Provide two sets of disposable filters. PART 2 - PRODUCTS 2.1 GENERAL

Manufacturer must clearly define any exceptions made to Plans and Specifications. Manufacturer is responsible for expenses that occur due to exceptions made.

2.2 Central-Station Air Handlers

a. Fabricate draw-through type air-handling units with fan sections, coil sections, filter sections, and mixing box.

b. Factory fabricates air-handling units of sizes, capacities, and configurations as

scheduled on drawings. c. Provide factory-installed base rails to support all sections of units. Construct base

rails of minimum 10-gauge steel channels or I-beams. Base rail shall be chemically cleaned, coated with rust-inhibiting primer, and finished with epoxy paint.

2.2.1 Casing

a. Construct casings of minimum 16-gauge G90-u galvanized steel structural frames and minimum 50 mm (2-inches) thick double wall panels. Construct double wall panels of minimum 18-gauge epoxy-painted steel exterior panels and minimum 20-gauge steel interior panels or single wall panel of minimum 18 gauge epoxy-painted steel exterior panel as specified in the Equipment Schedule. In order to properly clean the interior of the air handler of particulate other debris, the casings shall be


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constructed such that structural frames are free standing and wall panels are non-load bearing. Contractor shall be responsible to provide connection flanges and all other framework that is needed on unit to ensure that removal of wall panels shall not affect structural integrity of unit.

b. Construct casing sections located upstream of supply fan for operation at 4 inches

water gage negative static pressure and casing sections located downstream of supply fan for operation at 6 inches water gage positive static pressure. Seal joints between casing sections with closed-cell foam gasketing for leak seal and thermal and acoustical break. All joints shall be caulked on both the interior and exterior.

c. Panels shall be fully removable to allow for a proper way to thoroughly clean panels

and to access internal parts. Secure panels to structural frames with stainless steel screws. Seal joints between exterior panels and structural frames with closed-cell foam gasketing for leak seal and thermal and acoustical break. All joints shall be caulked on both the interior and exterior.

d. Casings shall have removable access panels or doors as scheduled on drawings.

Construct access doors on minimum 18-gauge, epoxy-painted steel exterior panels and minimum 22-gauge epoxy-painted steel interior panels. Provide automotive style neoprene gasketing around full perimeter of access doors to prevent air leakage. Provide "ventlock" style non-corrosive alloy latches operable from the inside or outside of unit. If access doors do not open against unit operating pressure, provide safety latches that allow access doors to partially open after first handle movement and fully open after second handle movement. Insulate access doors with 1-inch thick 1-½ pound per cubic foot density matt-faced fiberglass insulation.

e. Panels shall be fully removable to allow for a proper way to thoroughly clean panels

and to access internal parts. Secure panels to structural frames with stainless steel screws. Seal joints between exterior panels and structural frames with closed-cell foam gasketing for leak seal and thermal and acoustical break. All joints shall be caulked on both the interior and exterior.

f. Casing shall have removable access panels or doors as scheduled on drawings.

Construct access doors on minimum 18-gauge, epoxy painted steel exterior and minimum 22-gauge epoxy painted steel interior panels. Provide automotive type neoprene gasketing around full perimeter of access doors to prevent air leakage. Provide "ventlock" style non-corrosive alloy latches operable from the inside or outside of unit. If access doors do not open against unit operating pressure, provide safety latches that allow access doors to partially open after first handle movement and fully open after second handle movement. Insulate access doors with 2-inch thick, 1-½ pound per cubic foot density matt-faced fiberglass insulation.

g. Insulate casing sections with 1-inch thick, 1-½ pound per cubic foot density matt-

faced fiberglass insulation. Provide double wall casing construction and encase insulation between exterior and interior casing panels such that no insulation is exposed to airstreams. Foil facing on insulation is not acceptable as alternate to double wall construction. Insulate all structural channels connected to casing panels and cover openings in structural channels with epoxy painted steel. Insulation shall comply with NFPA 90A. Insulation for single wall casing shall be the same as in double wall casing however exposed face of insulation shall be applied with neoprene coating suitable for this application.

h. Insulate fan sections and discharge plenums with 1-inch thick, 1-½ pound per cubic

foot density matt-faced fiberglass insulation. Provide double wall casing construction and encase insulation between exterior and interior casing panels such that no insulation is exposed to air stream. Foil facing on insulation is not acceptable as alternate to double wall construction. Insulate all structural channels connected to


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casing panels and cover openings in structural channels with epoxy painted steel. Insulation shall comply with NFPA 90A.

i. Provide sealed double wall drain pass constructed of minimum 18-gauge epoxy

painted exterior pans and minimum 18-gauge 304 stainless steel interior panels. Encase manufacturer's standard insulation between exterior and interior panels. Drain pans shall be sloped in 2 planes; cross break interior pans and pitch toward drain connections to ensure complete condensate drainage. Units with cooling coils shall have drains pans under complete cooling coil section. All drain pan connections will be to the side of the unit.

2.2.2 Fans

a. Provide supply fan section(s) with BI or AF double width, double inlet centrifugal fan designed and suitable for class of service indicated in the unit schedule. Fan shaft to be properly sized and protectively coated with a thin coat of epoxy paint applied after shaft installation. Fan shafts shall be solid and properly designed so that fan shaft does not pass through first critical speed as unit comes up to rated RPM. Fans shall be statically and dynamically tested as an assembly at the required RPM to meet design specifications. Key fan wheels to fan shaft to prevent slipping.

b. Provide self-aligning, grease lubricated pillow-block ball bearings selected for L-10;

200,000-hour minimum life per ANSI/AFBMA 9. Extend grease lubrication fittings to drive side of unit with stainless steel tubes and Zerk fittings rigidly attached to casing.

c. Mount fans on minimum 16-gage epoxy painted steel isolation bases. Internally

mount motors on same isolation bases and internally isolate fans with 2-inch housed spring seismic isolators. Install flexible ducts of heavy glass fabric double-coated between fan and casings to ensure proper isolation and prevent vibration and noise from being transmitted through the unit. Flexible ducts shall comply with NFPA 90A.

d. Fan sections shall have full height, double wall, hinged, removable access doors on

both sides for inspection and maintenance of internal components. Construct doors in accordance with Article 2.2 Paragraph D. To facilitate inspection of internal components, provide 8- by 10-inch sealed glass and wire view windows on access doors and provide marine lights inside fan sections. Construct marine lights of sealed glass fixtures with wire guards to keep electrical sockets dry and protect fixtures from damage.

e. Statically and dynamically balance fan section assemblies. Fan section assemblies

include fan wheels, shafts, bearings, drives, belts, isolation bases and isolators. Allow isolators to free float when performing fan balance. Measure vibration at each fan shaft bearing in horizontal, vertical and axial directions.

2.2.3 Motor and Drives

a. Factory installs all motors on slide base to permit adjustment to belt tension.

b. Fan motors shall be heavy duty, high efficiency TEFC, operable at 460 volts, 60 Hz, 3-phase.

c. V-belt drive shall be constant pitch rated at 1.2 times the motor nameplate.


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2.2.4 Coils

a. Coils shall be manufactured by the same company as the supplier of the air handling unit. Install coils such that headers and return bends are enclosed by unit casings.

b. Construct coils of configuration plate fins and seamless tubes. Fins shall have collar

drawn, belled and firmly bonded to tubes by means of mechanical expansion of tubes. Do not use soldering or tinning in bonding process.

c. Construct coil casings of minimum 16-gauge stainless steel with formed end

supports and top and bottom channels. If two or more coils are stacked in unit, install intermediate drain channels between coils to drain condensate to main drain pans without flooding lower coils or passing condensate through air stream.

2.2.5 Filters

a. Provide factory-fabricated filter section of the same construction and finish as unit casings. Filter sections shall have filter guides and full height, double wall, hinged, removable access doors for filter removal. Construct doors in accordance with Article 2.2 Paragraph D. Filter sections shall flange to other unit components. Provide filter block-offs as required to prevent air bypass around filters.

b. Provide 4-inch flat filter sections with maximum face velocity of 550 feet per minute with disposable filters. Filters shall be coated with an anti-microbial coating to prevent microbes from growing in the filters. Filters shall be removable from both side(s) of filter sections.

c. Provide high-efficiency filter sections as indicated on plans with maximum face velocity of 550 feet per minute with cartridge filters and disposable panel pre-filters. High efficiency filters shall be efficient with rated in accordance with ASHRAE 52 and UL Class 1 or Class 2. Filters shall be coated with an anti-microbial coating to prevent microbes from growing in the filters. Filters shall be removable from both sides of filter sections.

2.2.6 Mixing Box

Include equally sized openings, sized to handle full air capacity. Provide manual dampers as indicated.

2.3 CHILLED WATER CEILING CASSETTE UNIT

Cassette unit shall be design for air-foil blade centrifugal fan, high efficiency, quiet, and four way air distribution pattern. Return air enters the cassette unit through a large grille, cleaned by an easily removable and washable filter. The unit shall be equipped with an automatic condensate drain pump.

2.4 DUCTWORK SECTION 15895, “Ductwork and Ductwork Accessories” 2.5 ENVIRONMENTAL CONTROLS Section 15971, “Space Temperature Control Systems.” PART 3 - EXECUTION 3.1 INSTALLATION


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Install air distribution equipment as indicated and in accordance with the manufacturer’s instructions. Provide clearance for inspection, repair, replacement, and service. Electrical work shall conform to NFPA 70 and Division 16, “Electrical”. Provide overload protection in the operating disconnect switches and magnetic starters.

3.2 FIELD INSPECTION AND TESTS

Schedule and administer the specified tests. Provide personnel, instruments, and equipment for such tests. Correct defects and repeat the respective inspection and tests. Give the Engineer ample notice of the dates and times scheduled for tests and trial operations. Conduct inspection and testing in the presence of the Engineer and Owner’s representative.

3.2.1 Field Inspection

Prior to initial operation, inspect equipment installation for conformance with drawings and specifications.

3.2.2 Field Tests 3.2.2.1 Preliminary Tests

For each item of air handling and distribution equipment and its components, perform an operational test for a minimum period of 8 hours.

3.2.2.2 Testing and Balancing

After preliminary tests, test, adjust, and balance the air handling and distribution equipment in accordance with Section 15895, “Ductwork and Ductwork Accessories” 15996, “Testing and Balancing Air and Water Systems”.


Air handling units and chilled water type ceiling cassette fan coil units shall be counted by the actual sets installed and accepted to the satisfaction of the Engineer.




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Bicol International Airport Development Project Division 15 – Mechanical Section VI- Technical Specifications Industrial Ventilation and Exhaust Systems

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SECTION 15871- VENTILATION AND EXHAUST SYSTEMS (FANS & BLOWERS) PART 1 - GENERAL 1.1 APPLICABLE PUBLICATIONS

The latest editions of the publications listed below form a part of this specification to the extent referenced. The publications are referenced to in the text by the basic designation only.

1.1.1 US Department of Labor Occupational Safety and Health Administration (OSHA)

Standards 1.1.2 Air Movement and Control Association, Inc. (AMCA) Publications: 99 Standards Handbook 210 Laboratory Methods of Testing Fans for Rating 1.1.3 American Conference of Governmental Industrial Hygienists (ACGIH) Manual Industrial

Ventilation A Manual of Recommended Practice 1.1.4 American National Standards Institute (ANSI) Publications Z49.1-83 Safety in Welding and Cutting 1.1.5 American Welding Society (AWS) Publications D1.1 Structural Welding Code, Steel D1.3-81 Structural Welding Code – Sheet Steel 1.1.6 National Electrical Manufacturer’s Association (NEMA) Publications

ICS 2 – 1983 Industrial Control Devices, Controllers and Assembles (Rev 1-3) ICS 6-1983 Enclosures for Industrial Controls and System

MG 1-78 Motors and Generators R 1981 Rev. 1-8

1.1.7 National Fire Protection Association (NFPA) Publications

91.83 Installation of Blower and Exhaust System for dust, stock, and vapor removal or conveying

1.1.8 Sheet Metal and Air Conditioning Contractors’ National Association, Inc. (SMACNA) Publications 1975-1 Accepted Industry Practice for Industrial Duct Construction 1977 (Rev. A) High Pressure Duct Construction Standards. 1980-3 Rectangular Industrial Duct Construction Standards 1977-2 Round Industrial Duct Construction Standards


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1.1.9 Steel Structures Painting Council (SSPC) Specifications SP 5-85 White Metal Blast Cleaning PA 2-82 Measurement of Dry Paint Thickness with Magnetic Gages

1.1.10 Underwriters Laboratories Inc. (UL) Publications 555-79 Fire Dampers and Ceiling Dampers Building Materials Directory

705-79 Power Roof Ventilator 1.2 GENERAL REQUIREMENTS

Section 15011, "Mechanical General Requirements" applies to this section with the modifications specified herein.

1.2.1 Submittals 1.2.2 Shop Drawing a. Fan installation drawings

b. Duct systems

c. Support and anchor location, field-fabricated roof curbs, load imposed and structural

design calculations.

1.2.3 Manufacturer's Data and Shop Drawings

Submit manufacturer’s brochures and layout drawings for approval before delivery of materials and equipment. They shall contain enough detailed information to determine that the equipment conforms with the requirements of the Specification:

a. Fans including fan curves or rating tables, derating factors, and temperature ratings

b. Sleeve bearing data

c. Supports and hangers

d. Vibration isolators

1.2.4 Procedures a. Welding b. Testing agenda

c. Testing procedures

1.2.5 Certified Test Reports a. Fan data, including sound power level data

b. System test reports

1.2.6 Performance Curves for Fans

Submit certified performance curves including maximum and minimum settings. Indicate power, mechanical efficiency, static pressure, and total pressure plotted against flow rate in m³/hr, cmh (ft³/min., cfm).


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1.2.7 Operation and Maintenance Manuals

Furnish three complete sets of bound operating and maintenance instructions specifically for this installation. Operating portion shall be bound separately from Maintenance portion. Explain in detail any component or method peculiar to a particular system. Furnish one complete manual prior to the time that the equipment tests are performed. Provide a table of contents. Instruction sheets shall be legible and easily understood, with large sheets of drawings folded in. The manual shall be complete for all equipment, accessories, and appurtenances stipulated. Include as a minimum the following:

a. System layouts showing machinery and controls

b. Wiring and control diagrams with data to explain detailed operation of each component

c. Control sequence describing start-up, operation, and shutdown

d. Installation instructions

e. Safety precautions, trouble-shooting diagrams, and illustrations

f. Test procedures

g. Performance data

h. Parts lists, with manufacturers’ names and catalog numbers

i. Preventive maintenance schedules

j. Service organizations with names, addresses, and telephone numbers

1.2.8 Posted Operating Instructions Shall be provided at the time of final inspection and acceptance 1.3 QUALIFICATIONS 1.3.1 Qualification of Welders

The quality of welding and welding procedures shall be determined by testing the welders’ ability to make sound welds under standard working conditions, with the equipment to be used on the project, and in conformance with AWS D1.1. Submit certified copies of the qualifications of the welders employed on the contract. The Project Engineer shall be notified 24 hours in advance as to the time and place the tests will be conducted. Whenever practical, the tests shall be performed at the work site. The Project Engineer shall be furnished with a listing of the names and symbols to be used to identify the work performed by the welder or welding operator who, after completing a welded joint, shall identify it as his work by applying his assigned symbol for a permanent record. Welders who make acceptable procedure qualification test welds will be considered performance-qualified for the welding procedure used. Welders making defective welds during the qualification tests and welders responsible for making defective welds after passing the test shall be given a re-qualification test. Reassign a welder who fails a re-qualification test.

1.4 SAFETY PRECAUTIONS 1.4.1 Guards and Screens

Provide metal personnel safety guards for fans mounted within 2.1 m (7 ft) of occupied space and/or otherwise normally accessible unducted fan inlets and discharges and moving power transmission components in accordance with OSHA 29 CFR 1910.219. Construct guards and screens to provide, as applicable: required strength and clearance with minimal reduction in free area at fan inlets and discharges; cooling; access panels and tachometer readings; ease of sectional disassembly for maintenance and inspection functions where guard total weight exceeds 23 kg (50 lb.); weather protection where components are weather-exposed. Installed guards and screens shall not negate noise control and vibration isolation provisions.


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Fan RPM should not exceed that recommended in performance tables.

Insulate surfaces with service temperatures in excess of 60°C (140°F) and accessible to personnel from normal operating or maintenance location for burn protection as part of work under Section 15250, "Insulation of Mechanical Systems".

1.4.2 Welding Conform to ANSI Z49.1 for safety in welding and cutting. Part 2 - PRODUCTS 2.1 FANS

Statically and dynamically balanced; overall run-out shall not be greater than 1.6 mm (0.0625 in.). Fan types, arrangements, air-moving capacities and pressure ratings as indicated on the equipment schedule. Fans shall be AMCA certified. Fan performances indicated on the drawings shall be minimums.

Fan bearing life shall be minimum 200,000 hours (L50) at operating conditions. Fans shall be equipped with gravity back-draft dampers or electric motorized dampers where indicated; multidirectional vibration isolators to relieve vibration transmission from the unit; corrosion-resistant screens to exclude birds, debris, or insects. V-belt drives shall be factory preset to the specified rpm. Pulleys shall be sized for at least 150% of driven horsepower.

Fans shall have thermal overload protection in the operating disconnect switches within the building.

2.1.1 Centrifugal In-line Fans

AMCA “B” construction: The fan shall have a non-ferrous impeller and non-ferrous ring about the opening through which the shaft passes. Ferrous hubs, shafts, and hardware are allowed provided construction is such that a shift in impeller or shaft will not permit two ferrous parts of the fan to rub or strike. Direct - or belt-driven; non-overloading, backward-curved blower wheels; deep spun venturi; galvanized- or painted steel frame and casing. Electric motor shall be isolated from air stream. Shall have removable, gasketed, panels for access to interior. Provide hanger-type isolators with brackets for overhead installation on structural members; flexible neoprene shear pads or rubber isolators with support channels for floor installation.

2.1.2 Centrifugal Roof Exhauster

Heavy gauge aluminum hoods die-formed for uniformity, with a rolled bead for improved strength, can be easily removed for access to motor compartment. Fan and motor. Combinations are individually tested to insure the balance of motor capacity to fan’s requirements, insuring proper motor loading for longer life. Backward curved non-overloading aluminum airfoil impeller is statically and dynamically balanced for smooth, vibration free performance. The following accessories shall be provided by the fan manufacturer; bird screen made of 13 mm x 13 mm hardware cloth; un-fused safety disconnect switches; Internal wiring between motor and disconnect; gravity back draft dampers and factory fabricated roof curb.

2.1.3 Supply Fans

Centrifugal in-line supply fan, backward inclined, non-overloading fan complete with filter and TEFC motor. Motor can be serviced without disturbing the inlet/discharge duct connection. Access doors shall be provided to allow servicing of wheel, bearings, shaft and drive components.


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2.2 DUCT WORKS Section 15895, "Ductwork and Ductwork Accessories." 2.2.1 Motors and Motor Starters Refer to electrical drawings.

2.2.2 Wall-Mounted Exhaust Fans

Sidewall direct driven propeller fan with backdraft damper, ODP motor and rain hood. Provide connection of permanent wiring. Refer to equipment schedule for the airflow capacity and electrical data.

Part 3 - EXECUTION 3.1 INSTALLATION 3.1.1 Installation Requirements

Installation shall conform to NFPA 91, and SMACNA Round Industrial Duct Construction Standards, and SMACNA Rectangular Industrial Duct Construction Standards. Provide mounting and supports for equipment, ductwork, and accessories, including structural supports, hangers, vibration isolators, stands, clamps and brackets, access doors, blast gates, and dampers. Install accessories in accordance with the manufacturers' instructions. Positive pressure duct inside buildings shall be constructed airtight.

Steps shall be taken to insure that the impeller, bearings, and shaft are adequately attached and/or restrained to prevent a lateral or axial shift in these components.

3.1.2 Electrical Ground Continuity

Where electrical ground continuity is required, provide brazed connection insulated, multi-strand, copper wire jumpers across points of discontinuity. Connection to ground and continuity testing shall be provided as part of the work of Division 16.

3.1.3 Special Installation Requirements for Productivity Coated Steel Ductwork for Corrosive Fume

and Vapor Exhaust

Slope horizontal ducts flow or in the direction of air flow or in the direction opposite to airflow. Where necessary, slope duct to common drainage point. Provide drains at low points, at internal duct restrictions, as base of risers and where indicated.

3.1.4 Building Penetrations 3.1.4.1 General Penetration Requirements

Provide properly sized, fabricated, located, and trade coordinated sleeves and prepared openings, for duct mains, branches, and other item penetrations, during the construction of the surface to be penetrated. Provide sleeves for round duct and items 381 mm (15 inches) and smaller and prepared openings for round duct larger than 381 mm (15 inches) and square or rectangular duct. Sleeves, except as otherwise specified or indicated, shall be 20-gauge, 0.0396-inch (one-mm) thick mill galvanized sheet metal. Sleeves penetrating load-bearing surfaces shall be standard weight galvanized steel pipe. Provide roof penetrations as shown in SMACNA Accepted Industry Practice for Industrial Duct Construction.

3.1.4.2 Framed Opening

Provide framed openings in accordance with approved shop drawings. Refer to paragraph entitled "Fire Dampers," in this section, for related work.


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3.1.4.3 Clearances

Provide a minimum 25.4 mm (one inch) clearance between penetrating and penetrated surfaces. Fill clearance space with bulk fibrous glass or mineral wool and seal and close.

3.1.4.4 Tightness

Penetration shall be weather-tight, fireproof where fire rated surfaces are penetrated, vapor-tight to prevent vapor transmission to conditioned spaces, sound-tight to prevent vapor transmission normally occupied or finished spaces, flammable substances or gases could migrated.

3.1.4.5 Sealants

Sealant shall be elastomeric type. Apply to oil free surfaces to a minimum 10 mm (3/8 inch) depth.

3.1.4.6 Closure Collars

Provide a minimum 102 mm (4 inches) wide, unless otherwise indicated, for exposed ducts and items on each side of penetrated surface, except where equipment is installed. Install collar tight against the surface and fit snugly around penetrating item without contact. Sharp edges shall be ground smooth to prevent damage to penetrating surface. Collars for round ducts 381 mm (15 inches) in diameter or less shall be fabricated from 20-gauge, (0.0396-inch) one-mm nominal thickness, mill galvanized steel. Use a minimum of 4 fasteners to attach collars where the opening is 305 mm (12 inches) in diameter or less, a minimum of 8 fasteners where the opening is 508 mm (20 inches) in diameter or less. Fabricate collars for square and rectangular ducts with a maximum size of 381 mm (25 inches) or less from 20-gauge, (0.0396-inch) one-mm nominal thickness, and mill-galvanized steel. Fabricate collars for round, square, and rectangular ducts with minimum dimension over 381 mm (15 inches) from 28-gauge, (0.0516 inch) 1.3 mm in nominal thickness, mill galvanized steel. Install collars with fasteners a maximum of 152 mm (6 inches) on center.

3.1.5 Installation of Flexible Connectors

Flexibly connect duct and vibration isolated fans and specified components. When fans are started, stopped, or operating, flexible connector surfaces shall be curvilinear, free of stress induced by misalignment or fan reaction forces, and shall not transmit vibration. Leakage shall not be perceptible to the hand when place within 152 mm (6 inches) of the flexible connector surface or joint. Provide a minimum of 152 mm (6 inches) and a maximum of (2 feet) 0.6 m active length with a minimum of 25 mm (one inch) of slack, secured at each end by folding in to 24-gauge sheet metal or by metal collar framed.

3.1.6 Installation of Supports 3.1.6.1 Selection

Selection of duct and equipment support system shall take into account the best practice recommendations and requirements of SMACNA Industrial Duct Construction Standards, and NFPA 91; location and precedence of work under other sections; interferences of various piping and electrical work; facility equipment; building configuration; structural and safety factor requirements; vibration and imposed loads under normal and abnormal service conditions. Indicated support sizes, configurations, and spacing are the minimal type of supporting component required for normal loads. Where installed loads are excessive for the normal support spacing, provide heavier duty components or reduce the element spacing. After system start-up, replace or correct support elements, which vibrate and cause noise or possible fatigue failure. Exercise special care to prevent cascading failure.


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3.1.6.2 General Requirements for Supports

Securely attach supporting elements to building structural steel or structural slabs. Where supports are required between building structural members provide supplementary structural steel as specified for work under this section. On submittals, show location of supports and anchors and loads imposed on each point of support or anchor. Do not hang equipment from piping other equipment. Attach supports only to structural framing member and concrete slab. Do not anchor supports to metal decking unless a means is provided and approved for preventing the anchor from puncturing the metal decking. Where supports are required between structural framing members, provide suitable intermediate metal framing. Where C-clamps are used, provide retainer clips. A maximum span of 3 m (10 ft) shall exist between any two points, with lesser spans as specified or as required by duct assemblies, interferences, and loads imposed or permitted. Provide a minimum one set of two vertical support elements for each point of support and each length of duct, except as otherwise specified. Install supports on both sides of all duct turns, branch fittings, and transitions. Cross-brace hangers sufficiently to eliminate sway. Perforated straphangers are prohibited. Where ductwork system contains heavy equipment, hang such equipment independently of the ductwork. Duct support shall be vibration isolated from structure at point indicated. Provide vibration isolators in indicated discharge ducting system for a minimum distance of 50 m (164 feet) beyond the fan. Coordinate deflection of equipment mountings and conform to Section 15200, "Noise, Vibration, and Control". The location of supporting elements shall be limited by the allowable load on the purlin which shall be limited so that no greater than the moment produced by one Kip load at mid-span of purlin. When the hanger load exceeds these limits, provide reinforcing of purlins or additional support beams. When an additional beam is used, the beam shall bear on the top chord of the roof trusses and bearing shall be over gusset plats of top chord. Stabilize beam by connection to roof purlin along bottom flange.

3.1.6.3 Methods of Attachment

Attachment to building structural steel shall be by bolting or by welding, in accordance with AWA D1.1. Masonry anchors selected for overhead applications shall be constructed of ferrous materials only. Install masonry anchors in rotary, non-percussion, and electric drilled holes. Self-drilling anchors may be used provided masonry drilling is performed with electric hammers selected and applied in such a manner as to prevent concrete spalling or cracking. Pneumatic tools are prohibited.

3.1.7 Welding

Welding shall be done in accordance with the applicable provisions of AWS D1.1 and AWS D1.3.

3.1.8 Test Ports

Provide test access ports at points required for work under paragraph 3.2, "Testing, Adjusting, and Balancing", in this section. Locate test ports in straight duct as far as practical downstream of fans, change of direction fittings, takeoffs, interior to duct accessories, and like turbulent flow area.

3.1.9 Protective Coating Work 3.1.9.1 General Requirements for Protective Coating Work

Provide protective coating on exterior surfaces of ducts and surfaces of equipment with system as specified hereafter. Prime coat exterior surfaces of ducts and equipment with inorganic zinc coating as part of work under this section. Brush primer or protective coating where no primer is specified, onto corners and into crevices and welds, working the material into irregular surfaces for a holiday free finish.


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3.1.9.2 Inorganic Zinc Coating System 3.1.9.2.1 General Requirements, Inorganic Zinc Coating System

The following shall govern for a protective coating system primer based on inorganic zinc coating intended for shop application to specified black carbon steel surfaces with subsequent field finishing with compatible tie coat and modified acrylic top coat.

3.1.9.2.3 Surface Preparation SSPC SP 5 3.1.9.2.4 Application

Apply one coat at 2 to 3 mils (51 to 76 microns) dry film thickness by airless or conventional spray equipment. Use only those thinners and cleaners in amount recommended by the manufacturer.

3.1.9.2.4 Repair Field repair damaged surfaces in accordance with manufacturer's instructions.

3.1.9.3 Field Inspection of Protective Coating Work

Visually inspect coated surfaces from a maximum distance of (5 feet) 1.5 m with special attention given to corners and crevices. Check coating thickness in accordance with SSPC PA 2. Perform inspection immediately prior to erection of ductwork and equipment and in the presence of the Contracting Engineer. Repair coating as required. Apply additional coating if thickness is not sufficient.

3.1.10 Factory and Field Painting and Finishing 3.1.10.1 Factory Work

Factory finish interior ferrous metal and other specified metallic equipment and component surfaces with manufacturer's standard surface preparation, primer, and finish coating. Factory finish exterior to building space ferrous metal surfaces and other exterior to building and interior to building metallic or nonmetallic surfaces with specified protective coating system in accordance with the paragraph entitled "Protective Coating Material", in this section and otherwise with manufacturer's standard surface preparation, primer and finish which meet the requirements of paragraph entitled "Corrosion Prevention."

3.1.10.2 Field Work

Touch-up or if necessary, repaint factory applied finishes which are marred, damaged, or degraded during shipping, storage, handling, or installation to match the original finish. Field or shop fabricated ferrous metals required for installation specified under this section shall be cleaned and primed. Painting of surfaces not otherwise specified and finish painting of items primed at the factory or elsewhere, are specified as part of the work.

3.2 TESTING, ADJUSTING, AND BALANCING

Testing, adjusting and balancing shall be in accordance with the requirements of Section 15996. 3.3 SYSTEM OPERATION DEMONSTRATION

After systems and equipment testing, adjusting, and balancing has been completed and accepted, demonstrate the complete and correct functioning of systems equipment and controls by operation through normal ranges and sequences, and by simulation of abnormal conditions, including the manual tripping of fire dampers. Manually and automatically cause every device


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to function as intended. Readjust, as necessary, any settings and after sufficient operating time, but not less than 6 hours, verify ability of equipment and controls to establish and maintain stable and accurate operation and required system performance. Note any abnormal deviations, such as excessive vibration, noise, and head, binding damper mechanisms, and incorrect fan rotation. Make any necessary repairs, replacements or adjustments.


Exhaust fans, exhaust air duct and exhaust pipe support shall be either counted or measured in linear meters, actually installed and accepted to the satisfaction of the Engineer.




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Bicol International Airport Development Project Division 15 – Mechanical Section VI- Technical Specifications Ductwork and Ductwork Accessories

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SECTION 15895 - DUCTWORK AND DUCTWORK ACCESSORIES Part 1 - GENERAL 1.1 APPLICABLE PUBLICATIONS

The latest edition of publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

1.1.1 Sheet Metal and Air Conditioning Contractors’ National Association (SMACNA) Publications HVACDCS HVAC Duct Construction Standards – Metal and Flexible HVACTAB HVAC Systems - Testing, Adjusting, and Balancing HVACALTM HVAC Air Duct Leakage Test Manual 1.1.2 Air Diffusion Council (ADC) Publications ADC 1062R4 Air Diffusing Equipment Certification, Rating, and Test Material

ADC-63 Measurement of Room-to-Room Sound Transmission through Plenum Air Systems

1.1.3 American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE)

Publication

ASTM A 123 Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

ASTM A 167 Specification for Stainless and Heat-Resisting Chromium-Nickel Steel

Plate, Sheet, and Strip

ASTM A 527 / A 527M Specification for Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process, Lock- Forming Quality

ASTM B 117 Salt Spray (Fog) Testing ASTM C 553 Mineral Fiber Blanket and Felt Insulation (Industrial Type)

ASTM D 1654 Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments

ASTM E 96 Water Vapor Transmission of Materials

ASTM E 437 Specification for Industrial Wire Cloth and Screens (Square Opening Series)

1.1.4 Air Movement and Control Association, Inc. (AMCA) Publication AMCA 500 Test Methods for Louvers, Dampers, and Shutters 1.1.5 National Fire Protection Association (NFPA) Publication NFPA 90A Air Conditioning and Ventilating Systems 1.2 GENERAL REQUIREMENTS

Section 15011, "Mechanical General Requirements," applies to this section with the additions and modifications specified herein.


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1.3 SUBMITTALS 1.3.1 Shop Drawings

Submit shop-drawing showing the general arrangement of equipment, duct connections, hangers and others. Indicate also the equipment/duct sizes including control distances.

1.3.2 Manufacturer's Data

a. Dampers

b. Duct Connectors

c. Flexible Ducts and Connectors

d. Insulation and Vapor Barrier

e. Louvers

f. Air Filters

g. Eliminators

h. Drip Pans

i. Insect Screens

j. Diffusers, Registers, and Grilles

k. Sheet Metals

l. Test Holes

m. Acoustic Duct Liner

n. Variable Air Volume Boxes

1.3.3 Certificates of Conformance

a. Fire Dampers and Automatic Dampers 1.3.4 Certified Test Reports

a. Automatic Dampers. Submit certification of damper leakage testing and conformance with AMCA 500 and specified maximum leakage or pressure drop requirements.

b. Corrosion Protection

1.3.5 Field Test Reports 1.3.6 SMACNA Duct Construction Manuals

The SMACNA recommendations shall be considered as mandatory requirements. Substitute the word "shall" for the word "should" in these manuals. No negative pressure construction for 100-mm (4-inch), 150-mm (6-inch), or 250-mm (10-inch) water gauge is provided herein.

1.3.7 Pressure -Velocity Qualification Conforms to SMACNA HVACDCS Section I, “Basic Duct Construction”. 1.4 TESTING FOR CORROSION PROTECTION

Comply with ASTM A 123 or protect the equipment with a corrosion-inhibiting coating or paint system that has proved capable of satisfactory withstanding corrosion in accordance with ASTM B 117. Test shall be 125 hours for equipment installed indoors and 500 hours for equipment


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installed outdoors or subjected to marine atmosphere. Each specimen shall have a standard scratch as defined in ASTM D 1654.

1.4.1 Corrosion Criteria

Upon completion of exposure, coating or paint shall show no indication of 4deterioration or loss of adhesion, nor shall there be indication of rust or corrosion extending further than 3 mm (1/8 in.) on either side of original scratch.

1.4.2 Thickness of Coating

Thickness of coating or paint system on the actual equipment shall be identical to that on the test specimens with respect to materials, conditions of application, and dry film thickness.

1.5 PRESSURE VELOCITY CLASSIFICATION Conforms to SMACNA HVACDCS, Section I, “Basic Duct Construction” PART 2 - PRODUCTS 2.1 BASIC MATERIALS 2.1.1 Galvanized Steel Sheets (For all ordinary air-conditioning and ventilation ducts)

Thickness shall correspond with the G90 coating designation within ASTM A525; lock-forming grade shall conform to ASTM A527.

a. Rigid Metal Ducts : General configuration; materials; application limits; and construction,

including reinforcements, joints, and seams shall be guided by SMACNA HVACDCS Section I “Basic Duct Construction”.

b. Duct Fittings : SMACNA HVACDCS Section II, “Fittings and Other Constructions” shall

guide Construction. c. Duct Hangers and Supports : SMACNA HVACDCS Section IV, “Hangers and Supports”

shall guide Configuration. d. Bird Screens : Galvanized steel; nominal 2 x 2 mesh with 1.6-mm (0.063-in.) wire

diameter. e. Insect Screens : Provide removable nominal 8 x 8 mesh with 0.028 in. wire dia. insect

screens of grooved type, with vinyl or neoprene spline insert for securing screen cloth. f. Air Filters: Disposable-element or washable type as indicated on equipment schedule.

Permanent holding frames shall be aluminum or galvanized steel. Filter-media identification and airflow direction shall be indicated on frame.

2.1.2 Replaceable Cartridge

UL 95%, Class 2, UL classified and factory assembled, use filter media of Ultra-fine glass fiber having 95% average dust spot efficiencies, as indicated on plans, with final resistance of 249 Pa (1-inch W.G.) maximum velocity of 3.18 m/sec (625 FPM) and capacity indicated.

2.1.3 Ceiling Diffusers

Steel or aluminum construction. Four-way diffusion pattern, Surface mounted. Mitered flat face borders with gaskets to overlap ceiling opening and minimize smudging on ceiling surface. Removable directional cores to provide access to accessories like opposed blade damper and connecting duct. Factory chemical treatment of bare metal surfaces prior to application of primer and baked enamel finish. Color to be selected and approved by Architect.


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2.1.4 Air Grilles

Extruded aluminum construction. Mitered flat face borders to overlap ceiling or sidewall opening. Gaskets on supply air grille borders shall minimize smudging on ceiling or wall surfaces. Single or double set of individually adjustable streamline section blades. Retainer to firmly hold deflection setting. Factory chemical treatment of bare metal surfaces prior to application of primer and powder coated finish. Color to be selected and approved by Architect.

2.1.5 Opposed-Blade Dampers

For mounting on the neck of diffusers and grilles. Extruded aluminum construction. Gang-operated blades mounted in a rigid frame. Opposed-acting blades shall be key- or screwdriver-operated from the face of diffuser or grille. Plain mill finished.

2.1.6 Air Registers

Grilles with integral opposed-blade volume dampers. Factory assembled using rivets or retaining clips. Refer to individual description of Grilles and Opposed-Blade Volume Dampers.

2.1.7 Variable Air Volume

VAV terminal units shall be the type, size, and capacity shown and shall be mounted in the ceiling and shall be suitable for single or dual duct system applications. Actuators and controls shall be as specified in paragraph CONTROLS. Unit enclosures shall be constructed of galvanized steel not lighter than 0.85 mm (22 gauge 22 gauge or aluminum sheet not lighter than 1.3 mm (18 gauge).18 gauge. Single or multiple discharge outlets shall be provided as required. Units with flow limiters are not acceptable. Unit air volume shall be factory preset and readily field adjustable without special tools. Reheat coils shall be provided as indicated. A flow chart shall be attached to each unit. Acoustic performance of the terminal units shall be based upon units tested according to ARI 880. Sound power level shall be as indicated.. Acoustical lining shall be according to NFPA 90A.

2.2 DUCT SEALANTS

Mastic Type. Shall have excellent adhesion and elasticity for resistance to weathering, cracking, chipping, peeling, or shrinking.

Gaskets. Elastomeric type or open- or closed-cell rubber. 2.3 VOLUME DAMPERS

Balancing, factory-fabricated type. Galvanized-steel frame and blades zinc-plated shafts; and bronze bushings. Opposed-acting, die-formed interlocking blades. Blades shall operate simultaneously with minimum torque. Provide dampers with an extended shaft, quadrant operator, lever, locking setscrew, and bushing brought through the side of ducts. When installed on ducts to be thermally insulated, equip each damper-operator with stand-off mounting brackets, bases, or adapters to provide clearance between the duct and operator not less than the thickness of insulation. Stand-off mounting items shall be integral with the operator or standard accessory of damper manufacturer. Where quadrant operators are used, they shall be zinc plated with no exposed sharp edges. Quadrant shall have markings to indicate fully open or fully closed position of damper blades.

2.3.1 Fire Dampers UL 555


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2.3.2 Back draft Dampers (Gravity Dampers or Shutters)

Factory-fabricated, with statically balanced blades that open automatically when the fan starts and close by gravity when the fan stops. Provide the edges of blades with felt or rubber strips to prevent rattling.

2.3.3 Motorized Combination Fire & Smoke Damper - unit shall be made of galvanized steel with

multiple blade damper, fire rated at 1 1/2 hour, UL standard 555, damper and actuator shall be factory assembled and tested to assure operation.

2.4 VARIABLE AIR VOLUME (VAV) BOX

Unit casing shall be constructed of not less than 22 gauge galvanized sheet metal, with round inlet collars of the proper diameter and slip and drive connection on discharge opening. Single duct terminal units shall be factory assembled with a primary air damper assembly contained in a single unit housing. Interior surface of the unit casing shall be thermally and acoustically lined with a 25mm (1 inch) thick fibrous glass blanket with a black top layer and a green core. Complies with NFPA 90A, NFPA 90B, UL 181, and ASTM C 1071. Thermal conductance shall be 0.26 Btu/hr-ft2-°F. The unit shall be also equipped with differential pressure sensor and actuator.

2.5 DUCTS OF PRESSURE CLASS 150 MM (6 INCH) OR LESS WATER GAUGE

Construction, metal gauge, hangers and supports, and reinforcements shall conform to SMACNA HVACDCS. Ductwork shall be airtight and shall not vibrate or pulsate when system is in operation. Air leakage shall be less than 5 percent of the system capacity. Construct ductwork of galvanized steel.

2.5.1 Laps

Make laps at joints in the direction of airflow. Space button-punch or bolt-connection in standing seams at fixed centers not greater than 150 mm. Longitudinal locks or seams, known as "Button Punch Snap-Lock" may be used in lieu of Pittsburgh Lock.

2.6 DUCT SLEEVES AND PREPARED OPENINGS 2.6.1 General Penetration Requirements

Provide sleeves or prepared openings for duct mains, branches, and other item penetrations during the construction of the surface to be penetrated. The Contractor shall be responsible for the proper size and location of sleeves and prepared openings.

a. Duct Sleeves

Provide sleeves for round ducts and items 375 mm (15 in.) diameter and smaller. Sleeves, unless otherwise specified, shall be 20-ga. galvanized steel. Install structural steel sleeves where load-bearing surfaces are penetrated. Allow 25-mm (1-in.) clearance between duct and sleeve or, for insulated ducts, between insulation and sleeve, except at diffusers, grilles, and registers.

b. Prepared Openings

Provide prepared openings for rectangular ducts, round ducts, items larger than 375 mm (15 in.). Allow a 25-mm (1-in.) clearance between duct and edge of opening or, for insulated ducts, between insulation and edge of opening, except at diffusers, grilles, and registers.


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c. Closure Collars

Provide a collar, a minimum of 100 mm (4 in.) wide, on each side of walls or floors where sleeves or prepared openings are installed. Fit collars snugly around ducts and insulation. Grind smooth edges of collar to preclude tearing or puncturing insulation covering or vapor barrier. Use nails with maximum 150 mm (6 in.) centers on collars.

2.7 DEFLECTORS

Factory-fabricated and factory-or-field-assembled units consisting of curved turning vanes for uniform air distribution and change of direction with minimum turbulence and pressure loss. Provide curved vanes for square elbows.

2.8 ACCESS DOORS

Weld doorframe in place. Door shall be rigid and airtight with neoprene gaskets and two or more galvanized steel hinges and tension fasteners. Provide doors as large as practical. Mount doors, if possible, so that air pressure holds them closed.

2.9 BACK-DRAFT DAMPERS (GRAVITY DAMPERS OR SHUTTERS)

Factory-fabricated, with statically and dynamically balanced blades that open automatically when the fan starts and close by gravity when the fan stops. Provide the edges of blades with felt or rubber strips to prevent rattling.

2.10 FLEXIBLE DUCTS AND CONNECTIONS

UL 181, CLASS 1, UL LISTED, SMACNA HVACDS, and additional requirements herein specified. Use to connect between rigid ducts and outlets and terminals. There shall be no erosion, delamination, loose fibers, or odors from duct into the air stream. Flexible ducts shall be maximum 8 feet in length. Maximum bend radius shall be twice of the duct diameter.

2.10.1 Materials Interlocking spiral or helically corrugated type constructed of aluminum. 2.10.2 Insulation and Vapor Barrier

ASTM C 553; minimum 50mm (2 inch) nominal thickness and 48 kg/cu.m. (3-lb/cu ft.) density The insulation shall be sheathed with a vapor barrier having a maximum water vapor permeance of 0.02 ppm ASTM F 96. Procedure C, coat ends of insulation with cement to prevent erosion and delamination.

2.10.3 Joints

Make airtight slip-joints, seal with pressure-sensitive vapor-seal tape or duct sealer, and secure with metal screws. To prevent insulation compression, place 50 mm (2 inch) wide by one -inch thick closed cell foam plastic spacer over the joints under vapor barrier such spacer.

2.11 ACOUSTICAL DUCT LINING

Acoustic duct lining shall not be less than one-inch thick flexible unicellular rubber and perforated plate. Increase duct sizes indicated to compensate for thickness of lining. Provide 6 duct diameter downstream and upstream from the air handling unit.


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Installation shall conform to SMACNA HVACDCS and NFPA 90A, Provide mounting and support of ductwork and accessories including, but not limited to, structural supports, hangers, vibration isolators, stands, clamps and brackets, access doors, and dampers. Install ductwork accessories as indicated in accordance with the manufacturer's printed instruction. Allow clearance for inspection, repair, replacement, and service.

3.1.1 Ductwork

When air distribution systems are operated, there shall be no chatter, vibration, or dust marks. After ducts are thermally or acoustically insulated, ensure airflow area equal to duct cross section dimensions indicated.

3.1.1.1 Field Changes to Ductwork

Those required to suit the sizes of factory-fabricated equipment actually furnished, shall be designed to minimize expansion and contraction. Use gradual transitions in field changes as well as modifications to connecting ducts.

3.1.1.2 Deflectors

Provide in square elbows, duct-mounted supply outlets, take-off or extension collars to supply outlets, and tap-in branch-off connections. Adjust supply outlets to provide air volume and distribution as indicated or specified.

3.1.1.3 Access Doors

Provide for maintenance, automatic dampers, volume dampers, coils, thermostats, temperature controllers, valves, filters, humidifiers and other concealed apparatus requiring service and inspection in the duct systems.

3.1.1.4 Duct Sleeves and Prepared Openings

Install for duct mains, duct branches, and ducts passing through roofs and ceilings. The Contractor shall be responsible for the proper size and location of sleeves and prepared openings.

3.1.2 Duct Hangers and Supports

SMACNA HVACDCS, Section 4. Unless otherwise indicated, provide not less than two 25 mm (one-inch) by 1.5 mm (1/16-inch) galvanized strap-iron hangers spaced one on each side of duct. Provide seismic restraint complying with SMACNA GFSR. Anchor risers in the center of the vertical run to allow ends of riser free vertical movements. Attach supports only to structural framing members and concrete slabs. Do not anchor supports to metal decking unless a means is provided and approved for preventing the anchors from puncturing the metal decking. Where supports are required between structural framing members, provide suitable intermediate metal framing. Where C clamps are used, use retainer clips.

3.1.2.1 Flexible Ducts

Support ducts by hangers every 915 mm (3 feet), unless supported by ceiling construction. Use stretch flexible air ducts to smooth out corrugations, and long radius elbows, where possible, using a minimum length to make connections.


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3.1.2.2 Flexible Connectors

Provide flexible connectors between fans and ducts or casings and where ducts are of dissimilar metals. For round ducts, securely fasten flexible connectors by zinc-coated steel clinch-type draw-bands. For rectangular ducts, lock flexible connectors to metal collars.

3.1.3 Inspection Plates and Test Holes

Provide inspection plates and test ports at points required for work under Section 15996, “Testing, Adjusting, and Balancing”, in this Division. Locate test ports in straight ducts as far as practical downstream of fans, change-of-direction fittings, takeoffs, interior to duct accessories, and similar turbulent flow sections. Test ports shall be factory-fabricated, airtight, and corrosion-resistant with screw caps and gaskets. Extend caps through insulation.

3.1.4 Flashings

Provide waterproof flashings where ducts pass through exterior walls and roofs. The roofing contractor shall do flashings.

Tightness: Penetrations shall be weather-tight; fireproof where fire-rated surfaces are penetrated; vapor-tight to prevent vapor transmission to conditioned space; sound-tight to prevent sound transmission; and airtight to normally-occupied or finished spaces where inflammable substances or gases could migrate.

3.1.5 Cleaning of Ducts

Remove all debris and dirt from ducts and wipe clean. Before installing air outlets, use the fan to blow dry air through entire system at maximum attainable velocity. Provide temporary air filters on return ducts for this operation.

3.1.6 Air Filters Install with sealant and gaskets to prevent by-passing of air. 3.1.7 Eliminators

Equip each cooling coil in casings having an air velocity of over 3.0 m/s (600 fpm) through the net face area with moisture eliminators, unless the coil manufacturer guarantees, over the signature of a responsible company official, that no moisture will be carried beyond the drip pans under actual conditions of operation.

3.1.8 Drain Pans, Drain Connections, and Drain Lines

Provide coils and eliminators with drain and drain connections. Where coils are sectionalized, with one section above the other, install intermediate drain pans. There shall be no entrainment of water in air stream. Drain condensate from drain pans to the nearest floor drains. Equip drain lines with U-traps and a seal height 25 mm (one-inch) greater than the maximum static pressure rating of the fan system.

3.2 FIELD TESTS AND INSPECTIONS

The Contractor is responsible for the administration and direction of tests. Furnish instruments, equipment, connecting devices, and personnel for the tests. Notify Engineer 14 days before inspection or testing is scheduled. Correct all defects in the work. Repeat tests until the work is in compliance.


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3.2.1 Air Duct Leakage Tests

Comply with SMACNA HVACALTM. Test ducts, plenums, and casings for air leakage. Prior to application of insulation, subject new ductwork to static pressure equivalent to that indicated. Before installing supply outlets, apply temporary caps where outlets will be connected. Connect a test blower temporarily to inlet end of duct and, by throttling its intake, adjust static pressure in duct to required value. Read voltage and current to blower motor and total static pressure across blower wheel. Apply these data to AMCA certified performance table for the test blower to derive volumetric flow rate (cfm) of air injected into duct. Remove temporary caps and test blower. Verify the maximum allowable air leakage of the total air that the duct is required to deliver. Perform the measurement of leakage using a calibrated orifice tube with its individual calibration curve.

3.2.2 Performance Testing and Balancing Section 15996, "Testing and Balancing Air and Water Systems." PART 4 - CIRCULAR VAV AND CAV

4.1 AIR VOLUME CONTROL TERMINALS

4.1.1 Installation Instructions:

VAV terminals shall be installed using at least two support brackets (DIN-rail or L-profile), with anti-vibration rubber under the terminal. Each of these brackets shall be fixed with two threaded rods to the ceiling slab above.

This installation method:

a. Shall prevent the body of the VAV terminal from high mechanical tension, which could damage the construction and performance of the terminal.

b. Shall prevent torsion on the VAV terminals, which could cause malfunction of the damper blades.

c. Provides some flexibility to the final location of the VAV terminals.

d. Use at least 1x diameter straight duct length before the VAV inlet.

e. Additional manual volume control dampers (VCD’s) before the inlet are not required/ recommended.

f. All connections shall be thermally isolated.

g. Pressure sensing tubes of Flo-Cross® airflow sensor shall not be “kinked” or otherwise obstructed by the external duct insulation.

Installation of circular VAV terminals can be done in a similar way, with the only assumption that two circular support brackets with anti-vibration rubber (installation clamps) instead of DIN-rail or L-profile shall be used. To prevent the VAV terminal from rotation, we recommend to use a complete clamp (support + top bracket), so that the terminal is ‘clammed’ in between.

Optional 4 x Mupro fixing hooks can be used (see drawing).


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Duct works (PVC or Metal), diffusers, registers, grilles, VAV boxes and sheet metal shall either be counted or measured in linear meters, actually installed and accepted to the satisfaction of the Engineer.




******

Bicol International Airport Development Project Division 15 – Mechanical Section VI- Technical Specification Secondary Cables and Wire

for Load Side of Mech’l Equipment

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SECTION 15896 – SECONDARY CABLES AND WIRE FOR LOAD SIDE OF MECHANICAL EQUIPMENT

PART 1 – SECONDARY CABLES AND WIRE 1.1 SECONDARY CABLES AND WIRE

(1) The cables to be considered as “Secondary Cable and Wire” shall be the cables from distribution panels to final load.

(2) When possible these secondary cables and wires shall be of the same type as the

main cables. (XLPE multi-core cables) (3) When wires shall be used for secondary connection (only), the wires shall be in

accordance with the following:

(a) All wires shall be copper, soft-drawn and annealed, shall be of 99% conductivity, shall be smooth and true of cylindrical form and variation shall be within 1% of the actual size called for.

(b) All wires and cables shall comply with the requirement of the Underwriters

Laboratories, the A.S.T.M., I.C.E.A. and other relevant Standards as they apply to the particular usage.

(c) All wires and cables shall be as manufactured from a reputable and approved

manufacturer. (d) Wires and cables for power and lighting system shall be plastic insulated for

600 volts working pressure type “THHN” type unless otherwise noted on plans or specified.

(e) All wires for lightings power shall be stranded copper. (f) For Lighting and power systems no wire smaller than 3.5 mm sq. shall be

used, except for control leads or otherwise specified. (g) Color Coding Shall be provided for all service, feeder, branch, control and signaling circuit

conductors. Color shall be green for grounding conductors, and black for neutrals. The color of the underground conductors in different voltage systems shall be as follows:

(i) 230 volts, 1-phase : Phase A-Red Phase B-Yellow

(ii) 460 volt, 3-phase : Phase A-Red Phase B-Yellow Phase C-Blue (iii) The grounded conductors should be only of yellow/green type. (h) Splices and Termination Components Connectors for wires 5.5 mm2and smaller shall be insulated pressure-type or

twist lock splicing connector. Solder less lugs shall be provided on stranded conductors.



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1.2 CONTROL CABLES

(1) All control cable shall be as JIS, PEC, NEC or equivalent standard. Control cable shall be rigid copper type with minimum size of 1.0 mm2, PVC or XLPE insulation. They shall be of the control type with a standard number of cores of 12, 19, 27 or 37.

(2) The instrumental cable type can be used as well if of the following type: (a) Collectively screened (b) No armour (3) The collectively screened instrument cable type shall be used when electromagnetic

influences are present, or to ease installation. (4) The instrument cable type shall include only the following standard number of pairs 5,

10, 30 or 50. 1.3 CABLE MARKING AND SPLICES

(1) The Contractor shall develop a cable numbering list to be submitted to the Engineer for approval.

(2) All main and control cables shall be labeled at both ends with clear indication of the

cable number in accordance with the developed cable list. (3) Conductor identification shall be provided within each enclosure where a tap, splice

or termination is made. For conductors 16 mm2 and larger, color coding shall be by plastic-coated self –sticking markers, colored nylon cable ties and plates, or heat-shrink type sleeves. Control circuit terminations shall be identified.

(4) Splices shall be made in accessible locations; splices in conductors 5.5mm2 and

smaller shall be made with an insulated pressure type connector, splices in conductor 8 mm2 and larger, color coding shall be by plastic-coated self-sticking markers, colored nylon cable ties and plates, or heat-shrink type sleeves. Control circuit terminations shall be identified.

1.4 CABLE AND WIRES- INSTALLATION

1.4.1 Secondary Cables and Wires Routing

(1) Secondary cables and wire shall use cable trays or ladder. (2) Where this is not possible the routing has to be made in accordance with the

following: (a) Conduits in general shall be Intermediate Metallic Conduit (IMC) with an

interior coating. (b) Polyvinyl-chloride conduit (PVC) shall be heavy wall, schedule 40, with factory

made bends, couplings and fittings. (c) No Conduits shall be used in any system smaller than 20mm (3/4 inch)

diameter electric trade size, nor shall have more than four (4) 90 degree bends in any one run and where necessary, pull boxes shall be provided as directed.

(d) No wire shall be pulled into any conduit until the conduit system is completed

in all details, in the case of concealed work until all rough plastering masonry



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has been completed, and in the case of exposed work until the conduit work has been completed in every detail.

(e) The ends of all conduits shall be tightly plugged to avoid entrance of plaster,

dust and moisture while the construction of building is in progress. All conduits shall be reamed to remove all burrs.

(f) All pipes and fittings on exposed work shall be IMC and be secured by means

of metal clips, which shall be held in place by means of machine screws. When running over concrete surface, the screws shall be held in place by means of expansion sleeves. All pipes on exposed work shall be run at right angles to and parallel with the surroundings walls. No diagonal runs shall be allowed and all bends and offsets shall be avoided as much as possible. Where necessary conduit fittings shall be used. Conduits in all cases, shall be supported at 1.50 meter intervals maximum.

(g) No splicing of wires shall be made inside the conduit run from equipment to

box or from one box to another box. Splicing shall be done only in boxes.

1.4.2 Insulated Bushings

Bushing shall be made in such way to protect cables and wires as well as allowing easy maintenance.

PART 2 – PANEL AND CABINETS 2.1 Except when specified, all panels and cabinets shall be of the surface mounted type. 2.2 Standard panels and cabinets, as much as possible, shall be used and assembled on Site. All

panels shall be dead front construction, furnished with trims for mounting as required. Cabinets shall be code gauge steel with gutters at least 100mm wide and wider if necessary. The trim for all panels shall be finished in industrial gray enamel over a coat of rust inhibitor.

2.3 Panelboard main bus work shall be ampacity rated to equal or exceed overcurrent protective

device immediately ahead of it. All buswork shall be properly secured to withstand available short circuit forces at the location.

2.4 Distribution panels shall be equipped with two poles and three poles air circuit breakers of

sizes, voltage ratings and interrupting capacity as called for on the Drawings. 2.5 Panelboard buses: Copper bus bars shall be supported on bases independent of the circuit

breakers. Main buses and back pans shall be designed so that breakers may be changed without machining, drilling, or tapping. A separate ground bus marked with a green stripe along its front shall be provided and bonded to the steel cabinet for connecting grounding conductors.

2.6 Mounting heights: Panelboards, circuit breakers and disconnecting switches shall be mounted

so the height of the operating handle at its highest position shall not exceed 1.8m from the floor.

PART 3 – INDIVIDUAL BREAKERS AND SWITCHES 3.1 GENERAL (1) Individual circuit breakers, safety switches and disconnect switches shall be provided

where indicated on the Drawings or as required by the situation and the price is deemed to be included in the bid.

(2) Voltage ratings shall be suitable in each case of service application.



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(3) Enclosures shall be General Purpose. (4) Unless otherwise specified, minimum interrupting level for 230 volts circuit breakers

shall be 10 KA. 3.2 OPERATION TYPE (1) Circuit breakers shall consist of a quick-make, quick-break type entirely trip-free

operating mechanism with contact, arch-interrupter, and thermal magnetic trip unit for each pole, all enclosed in a molded-phenolic case.

(2) The thermal-magnetic trip unit shall provide time-delayed overload protection in case

of overload or short circuit current in any one pole. (3) Circuit breaker shall be trip indicating, with the tripped position of breaker handle

midway between “ON” and “OFF” positions. 3.3 RESIDUAL CURRENT CIRCUIT BREAKER (RCCB) (1) Shall be pole 250 volts maximum, 60Hz, rated at 25 amperes with adjustable ground

fault current sensitivity. (2) RCCB shall provide protection against ground fault (earth-leakage) current. (3) It shall stay independent in operation using a core balance current transformer for

differential current sensing and tripping. (4) RCCB shall have complete mounting box and accessories. (5) RCCB shall be of approved manufacture. PART 4 – DISCONNECT MEANS 4.1 Disconnect means shall be provided as indicated on the Drawings at motor locations.

Disconnect switches shall be fusible or non-fusible as required and of sizes as indicated on the Drawings.

4.2 Disconnects shall be KW rated, of sufficient capacity to carry the continuous current of the

load it controls and of the correct voltage rating. 4.3 Air or Gas circuit breakers shall be used where feeder and motor protective means require.

Circuit breaker shall be provided at each motor location where it is not within the sight of respective control starter, unless indicated otherwise on the Drawings. All circuit breakers shall be totally enclosed.

* * * * *

Bicol International Airport Development Project Division 15 – Mechanical Section VI- Technical Specification Space Temperature Control Systems

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SECTION 15971 - SPACE TEMPERATURE CONTROL SYSTEMS

PART 1 - GENERAL

1.1 APPLICABLE PUBLICATIONS

The publications listed below form a part of this specification to the extent referenced. The publication is referred to in the text by basic designation only.

1.1.1 American National Standards Institute (ANSI) Publications B31.1-83 Power piping; Addenda B 31.1 A-84; Addenda B 31.1B-84 Addenda B 31.1 C-84; Addenda B 31.1D-84

B31.5 83 Refrigeration Piping; Addenda B 31.5 A-85

1.1.2 American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE)

Publications 15-78 Safety Code for Mechanical Refrigeration 1.1.3 American Society of Mechanical Engineers (ASME) Publications Boiler and Pressure Vessel Codes (AM 80, Am 82) 1.1.4 American Society for Testing and Materials (ASTM) Publications A 126-84 Gray Iron Casting for Valves, Flanges, and Pipe Fittings, Specification for 1.1.5 Factory Mutual System (FM) Publications Approval Guide (1984) 1.1.6 National Fire Protection Association (NFPA) Publications 70-84 National Electrical Code (NEC) 1.1.7 Sheet Metal and Air Conditioning Contractors National Association (SMACNA) Publications 1976-1 Low Pressure Duct Construction Standards (1976) 1975-4 High Pressure Duct Construction Standards (1975-4) 1.1.8 Underwriters Laboratories Inc. (UL) Publications 1980 Fire Protection Equipment List. 1.2 GENERAL REQUIREMENTS

Section 15011, "Mechanical General Requirements" applies to this section, with the additions and modifications specified herein.

1.2.1 Description of Work

The work includes providing new automatic space temperature control (ATC) systems including associated equipment and appurtenances. Provide each system complete and ready for operation. Equipment, materials, installation, and workmanship shall be in accordance with ANSI B31.1, ANSI B31.5, ASHRAE 15, ASME Boiler and Pressure Vessel Codes, NFPA 70, and SMACNA Low and High Pressure Duct Construction Standards, except as specified or


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indicated otherwise. In the publications referred to herein, the advisory provisions shall be considered to be mandatory, as though the word "shall" had been substituted for "should" wherever it appears; reference to the "authority having jurisdiction" shall be interpreted to mean the Engineer. Provide control systems to maintain the conditions indicated, to perform the functions indicated, and to operate in the sequence specified. Provide control systems of the electronic, or electric type, or any combination of these types compatible with the existing controls. Control diagrams showing one type of control system on the drawings are not intended to show a preference for that type system. Installation shall be made by or under the direct supervision of competent technicians regularly employed in the installation and calibration of automatic temperature controls (ATC). Control equipment, valves, panels, and dampers shall bear the manufacturer's name plate. Where the distance from the sensing element to a panel exceeds the manufacturer's recommended capillary length, provide a remote transmitter between the sensing element, and the operating and adjusting mechanism at the panel. The contractor shall verify with the equipment manufacturer/supplier to ensure that the control system will have no conflict on its operation.

1.2.2 Submittals Required 1.2.2.1 Manufacturer's Data a. Valves and operators

b. Stand Alone Control Units and Accessories

c. Temperature sensors, including complete wiring and connection diagrams

d. Pressure sensors, including complete wiring and connection diagrams

e. Dew point and humidity sensors, including complete wiring and connection diagrams

f. Switches, relays, including complete wiring and connection diagrams

g. Smoke detection devices

h. Temperature indicators including remote bulb sensor.

i. Damper Actuators

1.2.2.2 Shop Drawings a. Temperature control schematic and wiring diagrams

b. Sequence of operation for each system and function

c. Control panels

d. Equipment interlocks as specified under "Sequence of Operations"

e. One-line diagrams from sensor and control points to stand alone control unit, including

all components signal values, cables, and terminal markings.

1.2.2.3 Certificates of Compliance a. Valves b. Smoke detectors 1.2.2.4 Operation and Maintenance Manuals

Furnish an operation and maintenance manual for each item of equipment listed under "Manufacturer's Data." The manuals shall contain full hardware support documentation, which shall include, without being limited to, the following:

a. General description and specifications

b. Installation and initial checkout procedures


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c. Principles and theory of operation

d. Detailed electrical and logical description

e. Complete trouble-shooting procedures, diagrams, and guidelines

f. Complete alignment and calibration procedures for all components

g. Preventive maintenance requirements

h. Detailed schematics and assembly drawings

i. Complete spare parts lists

j. Signal identification and timing diagrams

PART 2 - PRODUCTS 2.1 SYSTEM COMPONENTS

Sensors, industrial or commercial grade, shall be compatible with the automatic temperature control (ATC) equipment provided and shall have accuracies as stated herein. Instrument characteristics such as hysteresis, relaxation time, span, including maximum and minimum limits shall be coordinated for all applications of sensors and controls, so that the control system shall operate smoothly and accurately throughout the design range.

2.1.1 Stand-alone Control Units and Accessories

The system shall utilize intelligent distributed Stand-Alone Control Units to interface sensors being monitored and equipment being controlled by the system. Each unit shall be microprocessor based and has the capability to perform the following functions:

a. Evaluate and report changes of state and or value that occur among points associated

with the remote unit.

b. Locally perform direct digital control (DDC) of all common mechanical system functions. Such functions shall be programmed using a sequential, numbered-statement programming language.

c. Acquire, process, accept, transfer information and execute commands, to and from the

central computer, network computer, operators, terminal & other remote units or other input devices.

Each stand-alone control unit shall execute all application programs, calculations and commands via a 16-bit microcomputer resident in the unit. All data base for each unit and the operating system and all application programs for each unit shall be stored within the unit. Each stand-alone control unit shall contain a real time clock to enable the unit to automatically perform time-based functions.

Each control unit shall be capable of full operation either as a completely independent unit or as a part of the building wide control system. All units shall contain the necessary equipment for direct interface to sensors and actuators connected to it. Control strategies shall be owner definable at multiple control unit locations, and for all control units in the system from any one operator terminal.

Each stand-alone control unit shall include its own microcomputer direct digital controller, power supply input/output modules, and battery. The battery shall be self-charging and be capable of supporting all memory/within the control unit if the commercial power to the unit is interrupted or lost for a minimum of eight (8) hours.

Each unit shall perform continuous diagnostics and any malfunction shall be annunciated at the operator's console as well as visually at the remote unit.


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Failure of any unit on the system shall not affect the proper operation of the remaining system components.

The system shall be capable of phased startup. That is, any unit shall be capable of properly communicating with the rest of the system while remaining units are being installed.

Surge transient protecting shall be provided in each unit for the purpose of suppressing induced voltage transients.

All units shall be listed by Underwriters laboratories (UL) against fire and shock hazard as a signal system appliance unit.

Units shall have all metal cabinets. Each unit including cabinet, power supply, function cards and termination modules shall be approved by U.L. Each unit shall have a pin-hinged door and master keyed lock. Remote units shall be capable of proper operation in an ambient environment of 0 degree C (32 degrees F) and 10% to 90% RH.

2.1.2 Input / Output Types

Each stand-alone control unit shall be capable of accepting multiple point inputs and outputs. These shall be of four types corresponding to industry nomenclature. They are as follows:

a. DIGITAL IN for monitoring status, alarms and accumulating pulses.

b. DIGITAL OUT for commanding two and three state devices.

c. ANALOG IN for measuring values

d. ANALOG OUT for positioning set points

It shall be possible for each remote unit to monitor the following types of inputs, without the addition of equipment outside the remote unit cabinets:

a. Analog Inputs (1) 4-20mA

(2) Thermistors b. Digital Inputs (1) Dry Contact Closure (2) Pulse accumulator

The remote unit shall directly control electronic actuator and control devices. Each control unit shall be capable of providing the following control outputs without the addition of equipment outside the remote unit cabinet:

a. Digital Outputs (contact closure)

(1) Motor Starters, Sizes 1-4 b. Analog Outputs (1) 4-20mA

(2) 0-16vDC (3) 0-135 Ohms


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2.1.3 Operators Interface

The control system shall permit full operator communication including: obtaining information about the performance of his system; allowing the operator to change the system operation; and diagnosing system malfunctions. Operator communication shall be through the use of any one of the following operator terminals which can directly connected to the remote unit.

a. Printer

b. 17 inch LCD monitor

c. Central Computer

d. Network (Personal) computer

e. Portable Programming Unit

2.1.4 User Programmability

All temperature control strategies shall be definable by the operator through a portable programming unit. The system shall be provided complete with all equipment and documentation necessary to allow the operator to independently perform the functions listed below:

a. Read the value of a measured variable (i.e. temperature)

b. Start or stop equipment

c. Monitor the status of equipment being controlled

d. Read the set point of a control loop

e. Determine the control strategies that have been defined for a specific piece of equipment

f. Generate displays of control strategies

g. Add/delete control loops to the system

h. Add/delete points to the system

i. Creates, modify or delete control strategies

j. Assign sensors and/or actuators to a control strategy

k. Tune control loops through the adjustment of control loop parameters

l. Enable or disable control strategies

m. Generate hardcopy records of control strategies on a printer

n. Select points to be alarmable and define the alarm state(s)

2.1.5 Automatic Temperature Control Valves

Provide minimum ANSI Class 125, cast iron (for steel piping systems) valves installed with stems horizontal or above. Valves shall have flanged end connections, except valves smaller than 65 mm may have threaded end connections with a union on all but one side of the valve. Cast iron components shall conform to ASTM A 126, Class B or C.

2.1.6 Self Diagnostics and Alarm Reporting

Each stand alone unit shall contain self diagnostics that continuously monitor the proper operation of the unit. A malfunction of the unit will be reported, and will inform the operator of the nature or the malfunction and the control unit affected. It shall be possible to annunciate malfunction as well as other control unit at a selected operator’s terminal.


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2.1.7 Valve Operators

Provide electronic type with spring return so that, in the event of power failure, they will FAIL SAFE in either the normally open or closed position as indicated or specified. Operators shall function properly within range of 85 to 110 percent of the motive power of the system.

2.1.8 Temperature Sensors

Provide analog or binary type, as specified or indicated. Analog temperature sensors shall provide an output signal that varies linearly and continuously with the sensed temperature, within a specified range, and shall be thermistor or resistance type. Binary temperature sensors shall provide an output signal that is either ON or OFF depending upon whether the sensed temperature is above or below the set point temperature and shall be electric type. All sensors of a particular category in any one building shall be of the same type and manufacturer. Temperature sensors shall be suitable for one or more of the following mounting styles: room (space) type, insertion (air duct) type, or immersion (liquid) type. Provide temperature sensors with the following characteristics:

a. Insertion or Immersion Types -- Stem or tip sensitive type only, unless otherwise

indicated.

b. Sensing Elements -- Hermetically sealed, except for bimetal type for room thermostats,

c. Stem, Tip, or Extended Element Construction -- Type 304 stainless steel or copper.

d. External Trim Material -- Completely corrosion resistant to media in which it is inserted or immersed, with all parts assembled into a watertight (except room type), vibration-proof, heat resistant assembly.

e. Thermometer Wells -- Of bronze or stainless steel materials; thermal transmission material shall be compatible with the sensor.

2.1.8.1 Electronic Analog Temperature Sensors

Sensors shall operate throughout the range of minus -40 (-40) to plus 102 degree C (216 degrees F) for normal heating, ventilating, and air conditioning (HVAC) sensing; and throughout the range of zero to 260 degrees C (500 degrees F) for high temperature sensing. Where specified or indicated, sensors shall be individually calibrated to provide an allowable deviation not to exceed plus minus 0.10 degrees F. Sensors shall have a time constant response to achieve 63 percent of a step temperature change in 3 seconds and 98 percent of a step temperature change in 6 seconds in water flowing at 3 fps. All sensors of the same type shall be interchangeable without subsequent calibration, and shall provide an allowable deviation not to exceed that defined in the following equation:

D = 0.005 times the absolute value of (X - 70F) + 0.5 F

where D = Allowable Deviation, plus or minus, degrees F F = degree Fahrenheit X = Any temperature through out range, minus -1.1.C (30F) to

plus 135 C (275F), or zero to plus 260 C (500F) 2.1.8.2 Outside Air Sensing Type

Provide sun shades to minimize solar effects and shall be mounted to minimize building outside air film effects.

2.1.9 Pressure Sensors

Construct the entire assembly so that shock, vibration, and pressure surges of 150 percent of operating pressure range, but not less than 1.77 kg/sq. cm-gauge (25 psig), above or below


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scale will neither harm the sensor or affect its accuracy. Provide pressure sensors with the following characteristics:

a. Ambient Temperature -- 40 to 140 degrees F.

b. Pressure Sensing Elements -- Provide corrosion resistant type.

c. Switches -- Provide snap-action type with platinum alloy, silver alloy, or gold-plated

wiping contacts rated for the application consistent with switched voltages and power levels.

2.1.10 Relative Humidity Sensors

Sensors shall be suitable for indoor and outdoor use. Sensors mounted outdoors shall be protected from wind and rain by a suitable weather hood. Provide a suitable shield for sensors mounted indoor and subject to air velocities greater than manufacturer's recommended limits.

2.1.10.1 Relative Humidity Sensor

Sensor shall be an analog precision resistance or hygro-mechanical gage type relative humidity detector. Sensor shall have an allowable deviation of plus or minus 1.0 percent of relative humidity over the range of zero to 100 percent relative humidity.

2.1.11 Fire Protection Devices

Provide Smoke detectors in the supply and return air ducts. Detectors shall be UL listed or FM approved for duct installation (To be provided by electrical contractor).

2.1.11.1 Smoke Duct Detectors

See Division 16 Section 16722. Provide duct detectors with approved duct housing, mounted exterior to the duct and with perforated sampling tubes extending across the width of the duct. Activation of duct detectors shall cause shut down of the associated air handling unit and operation of dampers; and annunciation or the signal source and tripping of the master fire alarm box or other building fire alarm transmitter, but shall not cause sounding of the building interior alarm devices.

2.2 ELECTRICAL AND ELECTRONIC POWER SUPPLY AND WIRING

120 volts or less, 60 Hertz, 2 pole, 3-wire with ground. The devices shall be UL listed or FM approved.

2.2.1 Relays Provide open contact, mercury tube or electronic type with dustproof enclosures. 2.2.2 Manual Transfer Switches

Provide with operating levers and index plates showing switch positions and names of apparatus controlled or other appropriate designations.

2.2.3 Wiring

Provide complete electric wiring for temperature control apparatus, including wiring to transformer primaries. Control circuit conductors run in same conduit as power circuit conductors shall have same insulation level as power circuit conductors. Circuits operating at more than 100 volts shall be in accordance with Section 16402, "Interior Wiring Systems." Circuits operating at 100 volts or less shall be defined as low voltage and shall be run in rigid or flexible conduit, metallic tubing, metal raceways or wire way, armored cable, or multi-conductor cable. Provide switches and fuses for the protection and convenient operation of the system.


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Aluminum sheathed cable or aluminum conduit may be used but shall not be buried in concrete. Protect exposed wiring from abuse and damage in an approved manner. Wire for low voltage AC shall be insulated copper No. 20 AWG or larger and shall conform to NFPA 70, Type MTW, THHN, TFFN or BN. For low voltage DC and electronic circuits carrying less than 0.5 amperes, cables of two or more conductors, not smaller than No. 22 AWG Solid copper if shielded or No. 20 AWG solid copper if not shielded, may be used in lieu of individual wires. Shield cable carrying analog signals. Cable shall terminate in solder or screw type terminal strips. Cable shall not be tapped at intermediate points. Wires, whether individual or in cables, shall be intermediate color coded or numbered for identification. Cables terminating in screw type terminal strips shall have pressure type connectors. Wire in physical contact with compression screw will not be acceptable.

2.3 TEMPERATURE INDICATORS

Provide an indicator with remote bulb sensors. Indicators shall have midpoint readings approximately equal to the normal temperature of air. Provide indicators with stainless steel case, 90 mm (3.5 inch) minimum diameter dial with glass face gasketed within the case; accuracy within one percent of scale range. Provide scale range suitable for intended service.


Provide all necessary, wiring and conduit to connect the ATC components to secure an operational ATC system.

3.1.1 Wiring

Wiring from sensors and control devices, indicated or specified shall be provided to terminal blocks located in the Stand Alone Control Units. Permanently mark the terminal blocks and wires for identification.

3.1.2 Workmanship Wiring and the installation thereof shall conform to NFPA 70. 3.1.3 Identification

Label or code each field wire at each end. Permanently label or code each point of all field terminal strips to show the instrument or item served. Color coded cable with annotated cable diagrams may be used to accomplish cable identification.

3.1.4 Temperature Sensors

Stabilize sensors to permit on-the-job installations that will require minimum field adjustments or calibrations. Temperature sensor assemblies shall be readily accessible and adaptable to each type of application in such a manner as to allow for quick, easy replacement and servicing without special tools or skills. Strap-on mountings, utilizing helical screw stainless steel clamps, shall be permitted on hot water piping up to 75 mm (3-inch) sizes only, when pipe is cleaned to bright metal and strap on bulb and pipe is suitably insulated after installation. All other liquid temperature sensors shall be provided with wells. Outdoor installations shall be of weatherproof construction, designed to exclude driving rain or snow, or in NEMA 3R enclosures. Sensors shall be with brushed- aluminum or brushed stainless steel enclosures where located in finished spaces.

3.1.5 Duct Sensors

Provide sensors in ducts in general location indicated on drawings; specific location within duct shall allow accurate sensing of the air properties indicated or specified. Do not locate in dead air spaces or positions obstructed by such items as ducts or equipment. The location of


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installation shall be within the vibration and velocity limits of the sensing element. Where an extended surface element is required to properly sense the average or lowest air temperature, it shall be positioned and securely mounted within the duct in a manner approved by the sensor manufacturer. Temperature sensing elements shall be thermally isolated from brackets and supports to respond to air temperature only. Provide separate duct flange for each sensing element; securely seal ducts where elements or connections penetrate duct. Seal penetrations of duct insulation vapor barrier with vapor barrier coating compound to provide a vapor tight covering. Mount sensor enclosures so that they may be removed and serviced without disturbance or removal of the duct installation or vapor barrier.

3.1.6 Pipe Sensors

Provide all sensors measuring temperatures in pressure vessels or in pipes larger than 25 mm (1 inch) in diameter, except as specified herein, with wells properly fabricated for the service. Wells shall be non-corrosive to the medium being measured and shall have sufficient physical strength to withstand all (including test) pressures and velocities to which they are subjected. Where piping diameters are smaller than the length of the wells, provide wells in the piping at elbows to affect proper flow across the entire area of the well; wells may either look up-stream or down-stream. Provide suitable thermal transmission material within the well to speed the response of temperature measurement. Provide wells with sealing nuts to contain the thermal transmission material and allow for easy removal. Well shall not restrict flow area to less than 70 percent of line-size-pipe normal flow area.

3.1.7 Pressure Sensors

Provide sensors in NEMA 3R enclosures and provide sensors which are corrosion resistant throughout.

3.1.8 Temperature Indicators Mount temperature indicators to allow readability when standing at floor level.

3.2 ADJUSTMENTS

Adjust controls and equipment to maintain the conditions indicated, to perform the functions indicated, and to operate in the sequence specified.

3.3 INSTRUCTING OPERATING PERSONNEL

Upon completion of the work and at a time designated by the Engineer, provide the services of a competent technician regularly employed by the Contractor of the temperature controls for the instruction of the Airport personnel in the proper operation and maintenance of each automatic space temperature control system. The period of instruction shall be for not less than three-8-hour working days.

3.4 NAMEPLATES

Provide laminated plastic nameplates for all control items listed or shown in the submittal and approved control diagrams. Each inscription shall identify its function; such as mixed air controller,' 'cold deck sensor,' and when applicable, its position. Laminated plastic shall be 3mm thick Melamine plastic, black with white center core. Surface shall be a matte finish. All corners shall be square. The lettering shall be accurately aligned and engraved into the white core. Size of nameplates shall be 25 mm by 65 mm minimum. Lettering shall be minimum 6mm high normal block lettering. Key nameplates to a chart and schedule for each system. Mount charts and schedules under glass, in a frame, and place where directed near each system. Furnish two copies of each chart and schedule to the Engineer prior to final acceptance.


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3.5 TESTING

Contractor shall submit two copies of the operation and maintenance manual and two copies of a test plan to the Engineer not less than 14 days prior to acceptance testing. Test plan shall, as a minimum, indicate how ATC system is to be tested, what variables will be monitored during test, and what criteria for acceptance should be used. Indicate how operation of HVAC system and ATC system in all seasonal conditions shall be simulated. If the Engineer witnesses any tests, such tests shall be subject to his approval. If the Engineer elects not to witness the tests, Contractor shall provide performance certification.

3.5.1 Field Testing

Upon completion of 72 hours of continuous HVAC and ATC systems operations and before final acceptance of the work, Contractor shall test the automatic temperature control systems in service with the ventilating and air conditioning systems to demonstrate conformance with the contract requirements. Test controls through every cycle of operation, including simulation of each season in so far as possible. Test safety controls to demonstrate performance of their required function. Test data terminal cabinet for the presence of properly identified and accurate signals at each terminal connected to a sensor. Test for proper response to signals transmitted to the ATC controllers and actuators. Contractor shall furnish instruments, power supply, connecting devices, and personnel for the tests. If any of the automatic space temperature control equipment is proved to be defective in workmanship or material, adjust, repair, or replace the system. Repeat the tests to demonstrate conformance with the contract requirements.

PART 4 - CONTROLS DEVICES ACCESSORIES

4.1 SCOPE OF WORK

The contractor shall supply and install all the control equipment, auxiliary devices, instruments, etc. to perform satisfactory operations of all systems described in the specifications and/or indicated on the drawings. The drawings and the specifications are complemented each to the other. The sequence of operation of each system or piece of equipment is specified either under the equipment specification section or detailed on the drawings.

4.2 GENERAL REQUIREMENTS

a. Control system shall be of the electric, or electronics, (solid state) or a combination of them to provide the required sequence of operation. Controls shall have interface to building management and DCC systems.

b. Provide all relays, switches, gauges, sources of electricity and all other auxiliaries, accessories and connections necessary to make a complete operable system.

c. Install controls so that adjustments and calibrations can be readily made.

d. Unless otherwise noted, install all wall mounted thermostats 1400 mm above the floor, measured to the center line of instruments.

e. Insertion type thermostats shall have adjusting head at eye level, wherever practicable, for adjustment and calibration.

f. Install all control valves horizontally with the power unit up.

g. Unless stated otherwise temperatures shall be controlled within plus or minus 2°F(1°C) and humidity within plus or minus 5 per cent of the set point.


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h. Provide positive positioner devices on all controls operated in sequence and/or where specified or required to maintain the set point within the required limits without override.

i. After completion of installation, all automatic controls shall be regulated and adjusted and placed in complete operating conditions subject to the approval of the Engineer and a maintenance brochure including all operating instructions, specifications and sheets for all instruments shall be submitted by the Contractor.

j. Electric control systems shall conform to the requirements shown on the Drawings and shall effect the operation of the air conditioning systems contemplated by the design.

k. After all controls, valves and motors have been connected, test the systems in the presence of the Engineer to demonstrate the capability of each automatic control system to meet contract requirements.

l. Basic components shall be standard catalogue products of single reputable Manufacturer.

m. Do not duplicate factory furnished controls of unitary equipment like refrigeration machines, fan coil units, etc. but modify them to conform to these specifications.

Obtain from the manufacturer of unitary equipment, and submit written certification that proposed control circuit modifications do not conflict with or invalidate Manufacturer’s equipment warranty.

n. Instrument wire shall be run in conduits separate from other types of writing and shall terminate on identified terminal strips.

o. The wire terminals on instruments shall not be used as junction points to facilitate removal of instruments without disturbing others.

p. Instruments shall have laminated plastic name tags with tag numbers and service engraved on the tag. Tags shall be securely fastened to the instrument. Tags shall be black with white lettering.

q. The equipment shall be restarted after a power failure in the same sequence and with the same time delays as specified for normal start-up.

4.3 CONTROL PANEL AND CONTROL SYSTEM

a) Control panels shall be installed where shown and as required on the Drawings. Each panel shall include start-stop and pilot lights for all major equipment being controlled together with their starters and necessary heat detector, alarm and other related safety and fire alarm systems.

b) The control system shall be of DDC type and shall be complete with all necessary transformers, thermostats, valves, dampers, damper operators, and associated regulators required to maintain the conditions desired together with the thermometers, gauges, and other necessary accessories and the control wiring.

c) Shop drawings shall be schematic diagrams showing all the components of the control systems and the interconnection scheme. Each component shall be identified by name and/or schedule number of equipment item it controls.

d) Manufacturer’s detailed Shop Drawings, specifications, and data sheets for all equipment to be furnished shall be submitted to the Engineer for approval.


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4.4 CONTROL DEVICES

a. TEMPERATURE CONTROLLERS (With Remote Sensors)

Shall be supplied complete with metal cases and manual set point adjusters.

Room type controllers shall be mounted 1800 mm above the floor and in an accessible location.

Panel-mounted controllers shall be supplied with metal mounting adaptor plate and mounting assembly.

Controllers shall be designed for a throttling range of 2°F (1 °C) for a 3Vdc output change with a control dial range 55-85 °F (13-29°C) and shall be suitable for ambient operating limits 40-135 °F (4-57 °C).

b. DAMPERS

(1) Motorized automatic dampers shall be of the louver type with not less than 13 gauge welded steel frames and galvanized finish. Blades shall have interlocking edges, stainless steel side springs (or vinyl or neoprene gaskets), and Teflon-coated stainless steel thrust washers. Blades shall be edged with neoprene if the damper is to operate in outside air service either as an intake or discharge damper. Damper blades shall have steel trunnions mounted in nylon or iolite bearings.

(2) Dampers shall be not more than 1200mm. in length between bearings.

Modulating dampers shall be of the opposed blade type unless specified otherwise. Blades shall be not over 200mm. in width and shall not be less than 16 gauge galvanized steel. Hardware shall be zinc plated. One damper actuator shall be provided for each 1.5 sq. meter of damper area.

(3) Provide parallel blade dampers arranged for maximum turbulence and mixing of outside air with return air. Arrange dampers as necessary to prevent stratification or provide baffles necessary to correct stratification problems.

(4) Provide dampers of low leakage construction, so designed that the maximum leakage shall be 10 cfm/ft2 (0.005 m3/s/m2) of damper with 4” WG. (1 Kpa) Pressure differential applied.

c. Temperature Sensors

Duct temperature sensors shall have their sensing elements immersed inside the duct and the wiring enclosure mounting on the outer surface of the duct and shall be of the averaging duct type with linear output and suitable for ambient limits -40 to 250 °F (-40 to 150 °C).

Sensor shall be complete with a steel wiring enclosure with ½” (13mm) conduit knockout (top and bottom) and a 5 feet (1.5m) long sensing element.

Sensors shall be of corrosion proof construction.

Sensing elements for water pipe mounting shall be of the rod and tube type with linear output and shall be furnished complete with separable stainless steel bulb wells filled with heat conductive compound. Sensors shall be factory calibrated and tamperproof. If easily adjustable sensors are provided, they shall be located inside metal enclosures with cylinder lock and key to prevent unauthorized setting.


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d) Room Thermostats

(1) Shall have metal locking covers and shall be provided with concealed adjustment means, and with thermometers.

Each room thermostat shall be supplied with metal auxiliary mounting bases and metal subbase for surface mounting applications; plus a plastic guard to protect thermostat from damage.

(2) Line voltage on/off thermostats shall be of the bimetal operated snap action switch. They shall be underwriter’s laboratories Inc., listed at an electrical rating appropriate to the application. Thermostat shall operate on 2°F (1°C) differential and shall have a control dial range 55-85 °F (13-29 °C).

(3) Low voltage thermostats shall be of the self contained type with a 1000 ohm sensing element and an amplifier. Thermostat shall have a control dial range 55-85 °F (13-29°C) and a throttling range of 2°F (1°C) for a 3 Vdc output change.

4.5 Motorized Valves and Actuators

4.5.1 Motorized Control Valves- Type B

Motorized Control Valve shall be low voltage, 2-way, 2 modulating flow through operation of motor actuator and valve linkage in response to signal from proportional controller. To have the following features:

a. Application: As indicated on plans (AHUs and FCUs).

b. Single seated valve, straight-through pattern; screwed end connections, bronze body and removable brass seat on 15 to 50 mm sizes; flanged end connections, cast iron body and removable bronze seat on 65mm sizes and above; stainless steel stem and composition disc with removable throttling plugs.

c. reversing type motor, oil-immersed gear train, die- cast aluminium case, dual stroke (90 and 160 degrees), double-ended crankshaft and die-cast aluminium cover with built-in transformer.

d. Linkage directly mounted on motor, without adjustment requirements and comprising roller, slide mechanism, cam and stem position indicator and with 160 lb. seal-off force

e. Valve rated 240 deg. F maximum water temperature and 125 psi maximum pressure for flanged end connections and 150 psi for screwed end connections.

f. Motor rated 125 deg. F maximum ambient temperature.

g. Valve shall be sized to produce a full flow pressure drop approximately 1.5 times the full flow pressure drop of the unit by-passed, unless noted otherwise.

h. Valve analogue signal to be 2-10 vdc or 4-20m A.

i. Valves should be selected to withstand system pressure and operate at the selected pump pressure.


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4.5.2 Motorized Control Valves – Type C

Motorized Control Valve shall be low voltage, 2-way, 2-position, providing open-closed control of water flow through operation of motor actuator and valve linkage in response to signal from an on-off switch. To have the following features:

a. single seated valve, straight-through pattern; screwed end connections, bronze body and removable brass seat on 15 to 40 mm sizes; flanged end connections, cast iron body and removable bronze seat on 50 to 80 mm sizes; stainless steel stem and composition disc with removable throttling plugs.

b. reversing type motor, with oil-immersed gear train, die-cast aluminium case, dual stroke (90 and 160 degrees), double-ended crankshaft and die-cast aluminium cover with built-in transformer.

c. linkage directly mounted on motor, without adjustment requirements and comprising roller, slide mechanism, cam and stem position indicator and with 160 lb. seal-off force

d. valve rated 240 deg. F maximum water temperature and 125 psi maximum pressure for flanged end connections and 150 psi for screwed end connections.

e. motor rated 125 deg. F maximum ambient temperature.

f. Valve shall be sized to produce a full flow pressure drop approximately 1.5 times the full flow pressure drop of the unit by-passed, unless noted otherwise.

g. valve analogue signal to be 2-10 vdc or 4-20m A.

h. Valves should be selected to withstand system pressure and operate at the selected pump pressure.

4.5.3 CONTROL MOTOR (Actuator)

a. for valves and dampers specifications.

b. Electric, reversible, spring-return, proportional type complete with linkage.

c. Suitable for damper and motorized valve operation.

d. Shall be sized to operate with sufficient reserve power to provide smooth modulating action or two-position action as specified.

e. Damper actuator shall be suitable for 220/50 Hz power supply.


Stand-alone control units and accessories, input and output devices, valve operators and sensors shall be the number of sets actually installed and accepted to the satisfaction of the Engineer.


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Bicol International Airport Development Project Division 15 - Mechanical Section VI- Technical Specifications BMS Instrumentation

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SECTION 15972 - BMS INSTRUMENTATION

PART 1- GENERAL

1.1 WORK INCLUDED

a. Comply with Division 1, General Requirements and all documents referred to therein.

b. Provide all labor, materials, products, equipment and services to supply, install, wire calibrate and commission the electronic control and monitoring system instrumentation as specified in the point schedules, in this specification and as required to make a complete and functional system.

c. Coordinate instrumentation provisions with the BMS equipment specified in Section 16965.

2.2 QUALITY ASSURANCE

a. Instrumentation work shall be performed by one firm specializing in the installation of control systems for building environmental control or by the qualified BMS installer.

b. Products referenced under this Section establish the minimum acceptable standards of product quality, features and performance. Products provided under this Section shall be provided by the same supplier as the BMS system.

c. Engineer in-charge supervising the work shall be a duly Registered Electronics Engineer as required by R.A 9292 and revised National Building Code or as Registered Professional Mechanical Engineer experienced in BMS for HVAC System Application (R.A.8495).

PART 2 – PRODUCTS

2.1 RELATED WORK

a. Where the application of any special software package requires additional instrumentation to meet the requirements specified, provide the necessary instrumentation at no additional cost whether or not such instrumentation is identified.

b. Any required additional instrumentation shall meet the requirements of this Section. Submit details for review prior to installation.

c. Provide actuators and terminal unit controller for all VAV, constant volume controllers, fan coil units and other terminal devices. Where possible, have actuators and controls installed in the terminal unit manufacturer’s factory.

2.2 PRESSURE TO CURRENT TRANSMITTERS

a. Provide pressure to current transmitters, Instrument Code C1 having the following minimum specifications:

Documents

PART 3 - EXECUTION