G3IR-1000-35-SP-9001_R1.PDF

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ISSUED FOR DESIGN

07 Jun 2012

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Client Name: BASF India Limited

Project Name: Project GIR

Document No. : G3IR-1000-35-SP-9001

Date 07 June 2012

Project Number G3IR Page 2 of 41

HVAC GENERAL SPECIFICATION

G3IR-1000-35-SP-9001, Rev 1 Page 2 of 41

Record of Revisions

This specification has been revised as indicated below and described in the revision record on the following page.Please destroy all previous revisions.

Revision

No.

Date Description

0 29 May 2012 Issued for Clients Review

1 07 June 2012 Clients comments incorporated. Issued for Design.

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G3IR-1000-35-SP-9001, Rev 1 Page 3 of 41

Table of Contents

1.0 ...........................................................................................................................................................5SCOPE

2.0 ........................................................................................................................6CODES AND STANDARDS

3.0 ................................................................................................................................................7EQUIPMENT

3.1 .............................................................................................................................................7General

3.2 ................................................................................................................8Water Chilling Machines

3.3 .........................................................................10Variable Refrigerant Flow (VRF/VRV) System

3.4 .................................................................................................13Precision Air-conditioning Units

3.5 ............................................................................................15Air-cooled package air-conditioners

3.6 ....................................................................................................................16Fan Coil Units (FCU)

3.7 .........................................................................................................17Split Type Air-Conditioners

3.8 ........................................................................................................................18Centrifugal Pumps

3.9 .........................................................................................................................19Air Handling Unit

3.10 .............................................................................................................................................21Filters

3.11 ..................................................................................................................................21Heating Unit

3.12 .............................................................................................................................21Humidifier Unit

3.13 ............................................................................................................................21Expansion Tank

3.14 ............................................................................................................................21Ventilation Fans

4.0 .......................................24SPECIAL REQUIREMENTS FOR HAZARDOUS AREA APPLICATION

5.0 ....................................................................................................................................................25DUCTING

5.1 ...........................................................................................................................................25General

5.2 ......................................................................................................................25Ductwork Materials

5.3 ......................................................................................................26Fabricated Duct Components

5.4 .........................................................................................................................26Flexible Ductwork

5.5 ....................................................................................................................26Plenums and Casings

5.6 ..................................................................................................................................27Access Doors

5.7 .........................................................................................................................................27Dampers

5.8 ...................................................................................................29Grilles, Registers and Diffusers

5.9 ........................................................................................................................29Louvers and Vents

6.0 .........................................................................................................................................................30PIPING

7.0 ..............................................................................................................................................30INSULATION

8.0 .....................................................................................................................................31NOISE CONTROL

9.0 ..............................................................................................................34CONTROLS & INSTRUMENTS

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G3IR-1000-35-SP-9001, Rev 1 Page 4 of 41

10.0 ............................................................................................................................................35ELECTRICAL

11.0 .............................................................................35TESTING, ADJUSTING AND BALANCING (TAB)

12.0 ..................................................................................................................36INSPECTION AND TESTING

13.0 ..............................................................................................................39PROTECTION AND PAINTING

14.0 .......................................................................................................39PACKING AND IDENTIFICATION

15.0 ............................................................................................................................................40SPARE PARTS

16.0 ........................................................................................................................................41ATTACHMENTS

16.1 ..........................................................................41BLANK DATASHEETS OF HVAC SYSTEM

17.0 ...................................................................................................................41REFERENCE DOCUMENTS

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G3IR-1000-35-SP-9001, Rev 1 Page 5 of 41

1.0 SCOPEThe purpose of this specification is to define the minimum basic design & construction requirements of the HVACsystem. The HVAC design specification will govern the production and contents of the following documents:

Design-build packages

Technical specifications

HVAC general arrangement drawings

Detailed HVAC designs

Standard HVAC details

CONTRACTOR is required to comply with the requirements as outlined in this specification. Any deviation fromthis specification shall be clearly highlighted & taken permission of the COMPANY.

A.

Scope of Work:-Contractors scope of work shall include all activities e.g. Engineering, Procurement, Construction, Supplies

and Services necessary for turnkey execution of the project from basic design to commissioning and successful

performance guarantee test run at site of HVAC system.

B. The Contractors scope of services shall include but not be limited to the following:-

a. Design and Engineering comprising preparation of the following documents:-

Performing engineering design,

P&ID,

Equipment list with sizes etc.

b. Detailed Engineering comprising of:-

Single line diagram,

Layouts,

General arrangement drawings,

Fabrication and assembly drawings, etc

c. Procurement of material and bought outs items.

d. Shop/Site fabrication and testing.

e. Assembly of sub-assemblies.

f. Stage wise inspection and testing including third party inspection (if applicable) at shop.

g. Insulation, cladding, and painting.

h. Supply & Transportation to site.

i. Unloading, prolong storage/preservation and security at site.

j. Movement of material equipment, consumables etc at site.

k.

Construction, erection, installation, assembly, hook ups and field testing.l. Filling of lubricants, Oils, consumables etc. (for first filling and replacement as required before handing

over to owner).

m. Clear the work space of all construction aids debris etc. and provide a tidy work place from pre-

commissioning stage.

n. Pre commissioning and commissioning.

o. Satisfactory performance guarantee tests at site.

p. Handing over of plant to the owner as per Owners satisfaction.

q. Training of the Client Engineering and Operating Personnel.

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G3IR-1000-35-SP-9001, Rev 1 Page 6 of 41

r. All statutory clearances and permits from local, statutory and other bodies such as Chief controller of

explosives, Factory inspector, Labor Inspector, Electrical inspector, pollution controls board etc.s. Contractor shall carry out requisitioning activities and the requisition shall contain the following as a

minimum:-

Equipment data sheets including accessories and auxiliaries etc. indicating operating parameters,

performance requirements, construction features, instrumentation & controls, inspection and testing.

Scope of supply of equipment vendor and supply by others.

List of applicable specifications as well as Codes and Standards

Vendor documentation and data requirement.

Mechanical and Performance Guarantees.

Mandatory spare parts list.

Erection and Commissioning spares list.

Enquiry document for 2 (two) years recommended normal operating spares.

t. Issue of Request for Quotation to approved vendors.

u. Preparation of Detailed Purchase Requisition.

v. Post Order review of vendors drawings, data sheets & deliverables.

w. Vendors site support services for construction and commissioning

C. Scope of Supply:-

Contractors scope of supply shall include but not be limited to the following on turnkey basis:-

a. Complete HVAC system for each building including auxiliaries and accessories.

b. All electrical, instrumentation and controls.

c. All supports for equipment, piping, ducting etc.

d. Foundations and Foundation Bolts and grouting for all equipment and supports

e. First fill of all lubricants, refrigerants, heat transfer media as applicable & all other consumables and

subsequent filling before handing over to Owner.f. Any special tools and tackles required for operation and maintenance of the plant and equipment.

g. Spares for start-up and commissioning.

h. Mandatory Spares

i. Spares for 2 years normal operation (only itemized price list with recommended quantity to be furnished).

j. Any other item though specifically not asked for in the document but required for safe and efficient

operation of the plant and equipment.

2.0 CODES AND STANDARDSAll HVAC equipment shall be designed, manufactured and tested in accordance with the latest applicable sections

of the following regulations, codes, standards or specifications.

ASHRAE American Society of Heating, Refrigerating and Air Conditioning Engineers

ARI Air Conditioning and Refrigeration Institute

AMCA Air Movement and Control Association International

AABC Associated Air Balance Council

ADC Air Diffusion Council

UL Underwriters Laboratories Inc

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G3IR-1000-35-SP-9001, Rev 1 Page 7 of 41

NFPA National Fire Protection Association

ANSI American National Standards Institute

IEC International Electro-technical Commission

IEEE Institute of Electrical and Electronics Engineers

ASTM American Society for Testing and Materials

SMACNA Sheet Metal and Air Conditioning Contractors National Association

OSHA Occupational Safety and Health Administration

TEMA Tubular Exchanger Manufacturers Association

NBC National Building Code of India

BIS Bureau of Indian Standards

3.0 EQUIPMENT3.1 Generali. Materials and equipment shall be standard products of established manufacturers who have produced

continuously the type of equipment suitable for the conditions specified. All materials and equipment shall benew and of high quality insuring long life and reliable operation.

ii. All HVAC equipment shall be designed for continuous operation in an industrial environment.

iii. Units shall be factory assembled, factory wired and all operating functions tested before shipment. Unit casingsshall be high efficiency, of weather tight construction and suitably insulated to provide good thermal protectionand soundproofing.

iv. All electrical components, devices and equipment shall comply with IEC, NEMA and UL requirements andcarry the appropriate seals of approval.

v. Noise level of HVAC units shall not exceed 85 dB(A) at 1 m. distance from source.

vi. Air-cooled condensers shall be sized to reject the total heat at design outdoor air temperature.

vii. Fans shall be rated heavy duty centrifugal type. All fan wheel assemblies shall be statically and dynamicallybalanced.

viii.

Fan bearings shall be anti-friction, self aligning, grease lubricated, ball or roller type. Bearings shall be selectedfor continuous operation with minimum life of 60,000 hours. Facilities for lubricating bearing, such as greaseand relief fittings, shall have extended lube line to the front of the access panel.

ix. Blowers shall be provided with multi-V-belt (minimum 2 belts) drive and belt guard. Belts shall be sized totransmit the nameplate power rating with a minimum service factor of 1.5.

x. Fan motors shall be rated for fan duty, with a 1.15 service factor, mounted on adjustable slide base and pre-wired in flexible conduit to the control panel. Internal vibration isolation shall be provided for the fan and motor

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assembly as well as a neoprene coated heavy duty flexible connector between the fan outlet and the unit casingwall.

xi. Guards shall be designed to fit around all rotating machinery including couplings, V-belts, and chains. All suchguards shall be designed for easy removal and accessibility to equipment.

xii. Refrigerant used in air conditioning systems shall be environmental friendly with an ozone depletion potentialof zero and chlorine free (such as R-134a, R407c and R410a). R-22 may be used for unitary AC equipment onlysuch as window/split AC if these are not available with above mentioned refrigerants.

3.2 Water Chilling Machinesi. General:-

Water chillers shall comply with applicable standards as given below:

(a)

ARI standard 550/590 latest revision(b) ASHRAE 15 safety code(c) ANSI B31.5 Refrigeration piping

ii. Type:-Water chilling machines shall be with screw compressor. Water chilling machines shall be suitable forrefrigerant R-134a/R-407c/R410a. Air-cooled unit shall be provided with anticorrosive paint/coating suitablefor the site environment.

iii. Compressor:-Screw Compressor:-The compressor shall be as per manufacturers standard design and the offered model shallhave proven track record of satisfactory operation for a minimum period of 8000 hours for similar application.Compressor shall be equipped with automatic unloaded starting arrangement. The compressor shall behermetic/semi-hermetic/open type compressor. Compressor should be provided with fully modulating control towork from 100% to 20% of full load.

iv. Lubricating System:-An adequate oil supply will be made available to compressor at all times. An immersion heater, if manufacturersstandard design, will be provided to effectively remove oil from refrigerant. Provision shall be provided to removeoil from evaporator if it has reached evaporator. The oil shall be returned back to compressor automatically.

(a) The compressor shall be provided with all the safety features as per compressor manufacturers standardproven design.

(b) The compressor shall be factory tested with dry nitrogen against leak at pressure of 30 kg/cm2(g) or as perapproved standard practice of manufacturer for 2 hours and there shall be no leakage to valves, casing etc.

(c) Lubrication system as per manufacturers standard proven design and safety features shall be acceptable.

v.

Air Cooled Condenser:-The air-cooled condenser of the chiller shall consist of the following:

A. Coils

The tubes shall be of Seamless copper

The fins shall be of Aluminium

Condenser coils for installation in corrosive atmosphere shall be constructed of copper tubes andaluminium fins with galvanized steel end sheets. Alternatively the condenser coils shall beprovided with anti-corrosive protective coating.

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B. Fans

Propeller type or centrifugal type fans with direct drive or belt-drive arrangement.

Belt drives shall be completely enclosed within the unit casing or equipped with a guard.

Fans shall be statically and dynamically balanced.

C. Motors

Totally enclosed, fan-cooled suitable for all installations where motor is exposed to the weather or

in an air stream.

Motor starter shall be a magnetic across the line type within a watertight enclosure.

Thermal protection shall be of the manual or automatic reset type.

vi. Chiller:-Chiller shall be mechanically cleanable shell and tube type with removable heads. The tubes shall be internally

enhanced seamless copper and shall be rolled into tube sheets. Chiller shall be complete in all respects and shall beprovided with water in and out sensors for temperature & pressure.

In the event of the chilling unit having more than one compressor, there will be equal number of Independentrefrigeration circuits (If one circuit fails, it should not affect other circuits). Chiller shall have refrigerant reliefdevice as per ASHRAE safety code. Chiller and the cold refrigerant pipes to be neatly insulated with elastomericnitrile rubber / XLPE insulation (insulate all surface where condensation may occur) and weatherproofcoating/painting as per manufacturers standard. Water velocity shall not exceed 3.6 m/sec in tubes.

vii. Refrigerant Circuit:-The following components shall be provided in the Refrigerant lines.(a) Oil separator, Oil Heater (if manufacturers standard design).(b) High & low side pressure relief valve.

(c)

NRV at compressor discharge and liquid line shut off valves.(d) Liquid line filter cum dryer.(e) Moisture indicating sight glass.(f) Suction and discharge valves for each compressor.(g) Refrigerant and lube oil to be factory charged.(h) Provision for field charging post with valve.(i) Suction strainers to prevent any debris during system maintenance.

viii. Controls, Diagnostics and Safeties:-

A. Controls:

a) Unit controls shall include a PLC/Microprocessor based local control panel and LOCAL/OFF/REMOTEswitch and graphical diagnostic display with soft keypad.

b)

Shall be capable of performing the following functions:1) Automatic compressor lead / lag switching.2) Capacity control based on leaving chilled fluid temperature with return fluid temperature sensing.3) Limiting the chilled water temperature pull-down rate at start-up to an adjustable range to prevent

excessive demand spikes at start-up (Soft start) with Microprocessor based protection unit.4) Seven - day time scheduling of pump(s) and chiller(s).5) Display of percentage of full load operation at any time.6) Display of important parameters such as Water Temperature for condenser and chiller, evaporator

pressure, condenser pressure, incoming voltage, compressor Amps, load as part of full load inpercentage etc. Contractor shall furnish details with complete description, indications/display, setpoints, operational and diagnostic parameters.

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7) Access to the set points through ID and password recognition which will be defined in three differentlevels.

8) Operating parameters shall be stored in non-volatile memory to eliminate reprogramming the chiller.

B. Diagnostics:-

a) Display module shall be capable of displaying set points, time system status (including system ready to start,system running, system safety shut down, system auto start, temperatures, pressures and percent loading)and any alarm or alert conditions. Alarm shall be generated in different colours for different type ofindication.

C. Safety Features:-

a) Unit shall be equipped with all necessary components, and in conjunction with the control system shallprovide the unit with protection against the following:-1) Evaporator low pressure

2)

Condenser high pressure3) Discharge high / low temperature4) Anti-freeze protection5) Loss of refrigerant charge.6) Low chilled fluid temperature.7) Low oil pressure (each compressor circuit)8) Electrical overload9) Electrical and control power failure10) Low and high oil temperature.

Safety features specified above are general safety requirement as per prevailing industry practice. If vendorsoffered model deviates from the below, same shall be highlighted with reasoning. Control system as permanufacturers standard proven design/ safety features shall also be acceptable.

ix.

Electrical Requirement:-a) Electrical Power supply shall enter the unit at a single location.

b) Unit shall be suitable for 415V 10%, 3 phase, 50Hz 5% power supply.c) Unit shall be shipped with factory control & power wiring installed.d) Single phase wiring shall be 240V AC derived from 415V, AC through transformer. Chiller shall have its own

step down voltage arrangement.e) All the control system wiring shall be 24V DC, intrinsically safe, derived internally in the panel by the vendor.f) Unit shall be provided with differential pressure transmitter/flow sensor so that power is disconnected in case

of failure of water flow, through chiller and condenser respectively.g) The unit shall be provided with soft starter Electronic type, so as to limit the starting current.

3.3 Variable Refrigerant Flow (VRF/VRV) Systemi.

Type:-Unit shall be air cooled. Variable refrigerant volume air conditioner consisting of one outdoor unit and multipleindoor units. Each indoor unit shall have capability to cool independently for the requirement of the rooms. Allindoor units shall be provided with isolation valves so that a particular unit can be isolated and removed forservicing, while system keeps functioning in normal way.

It shall be possible to connect multiple indoor units on one refrigerant circuit. The indoor units on any circuitcan be of different type and also controlled individually. Following type of indoor units shall be connected tothe system:- Ceiling mounted cassette type.

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- Ceiling mounted ductable type.- Wall mounted Hi-Wall type.- Floor mounted type.

Compressor installed in outdoor unit shall be equipped with capacity control mechanism (inverter scroll/digitalscroll), and capable of changing the rotating speed / mass flow rate of refrigerant by scroll engaging / dis-engaging mechanism to follow variations in cooling. Outdoor unit shall be suitable for mix-match connection ofall type of indoor units.

The refrigerant piping between indoor units and out door units shall be extendable upto 100m with maximum50 m level difference without any oil traps. Oil recovery system shall be managed without disturbance tonormal operation cycle of the system / compressor.

Both indoor unit and outdoor unit shall be factory assembled, tested and filled with first charge of refrigerantbefore delivery at site.

ii. Out Door Unit:-The outdoor unit shall be factory assembled, weather proof casing constructed from heavy gauge mild steelpanels with powder coated finish. Outdoor unit shall be provided with anti-corrosive coating.

In case of outdoor units with multiple compressor, the operation shall not be disrupted with failure of anycompressor. The noise level shall not be more than 65 dB (A) at normal operation measured horizontally 1maway and 1.5 m above ground level. The outdoor unit shall be modular in design with possible futureexpansions. The unit shall be provided with microprocessor control panel.

iii. Compressor:-The compressor shall be high efficiency scroll type and capable for capacity controlling (inverter scroll/digitalscroll mechanism). It shall change the speed / refrigerant mass flow rate in accordance to the variation in

cooling load requirement. Refrigerant mass flow rate can be changed by speed modulation of compressor /mechanical control (scroll engaging / dis-engaging mechanism) system.

All outdoor units shall have multiple steps of capacity control to meet load fluctuation and indoor unitindividual control. All parts of compressor shall be sufficiently lubricated. Forced lubrication may also beemployed. Oil heater shall be provided in the compressor casing, if manufacturers standard design.

iv. Heat Exchanger:-The Heat Exchanger shall be constructed with copper tubes mechanically bonded to aluminium fins to form across fan coil and larger surface area. The fins shall have anticorrosion treatment for Heat Exchanger Coil. Thetreatment shall be suitable for areas of high pollution, moisture and salt laden air. The casings, fans, motors etc.shall also be with anticorrosion treatment as a standard features. The unit shall be provided with necessarynumber of direct driven low noise level propeller type fans arranged for vertical / horizontal discharge. Each

fan shall have a safety guard.

v. Refrigerant Circuit:-The Refrigerant Circuit shall include liquid receiver /accumulator, liquid & gas shut off valves and a solenoidvalve. All necessary safety devices shall be provided to ensure the safety operation of the system.

vi. Safety Devices:All necessary safety devices shall be provided to ensure safe operation of the system. Following safety devicesshall be part of the outdoor unit:-high pressure switch, low pressure switch, fuse, crankcase heater, fusible plug,over current protection for inverter, and short recycling guard timer.

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vii. Piping:-All connections of Refrigerant piping shall be in high grade Copper of Refrigeration quality with Eddy CurrentTesting and material test Certificates. All connections, tees, reducers etc. shall be standard make fittings.

Insulation of cold lines shall be carried out with elastomeric nitrile rubber insulation sheets and tubes ofappropriate thickness so that condensation does not occur. For individual Piping 50 / 100 mm wide AluminiumTape shall be used at joints of Piping with Bands for identification. For outdoor piping, the finish shall bewoven GRP Mat finished with coloured Epoxy paints to withstand outside ambient conditions and UVRadiation.

viii. Oil Recovery System:-Unit shall be equipped with an oil recovery system to ensure stable operation with long refrigerant piping.System shall be designed for proper oil return to compressor along with the distribution of oil to individualcompressor. The refrigerant piping shall be extended upped 100 M with 50-M level difference without oil traps.

ix.

Indoor Units:-Units shall be factory assembled, wired, piped and tested. Units shall have DX coils with copper tubes andbonded aluminium fins for highly efficient heat transfer. Units shall have Centrifugal fans for adequate amountof Air circulation and low Noise. Units shall have inlet filters, which are easily cleanable and replaceable. Allcomponents of Units are easily accessible for connection, repairs and maintenance. Units shall have very lownoise. All units with Factory manufactured Units, Grills shall have auto swing feature for proper Airdistribution. All units shall be controlled by electronic Expansion Valves only. All units mounted inside theceiling shall have fans capable of sustaining duct connections, and special filters if necessary. Visible indoorunits shall have wireless remotes. Price of the same shall be included in cost of unit by default. Concealedindoor units shall have sensor mounted on supply air grilles / diffusers which can be controlled with wirelessremotes. All units shall have adequate insulation or Lining to avoid condensation.

Cooling coil and refrigeration parameters shall be designed in such a way that supply air temperature shall not

be less than 140

C or 10

C above room dew point temp, whichever is more. Contractor shall guarantee insideconditions with selected supply air temperature.

x. Ceiling Mounted Cassette Type Unit (Multi-Flow Type):-The unit shall be ceiling mounted type. The unit shall include pre-filter, fan section and DX-coil section. Thehousing of the unit shall be powder coated galvanised steel. The body shall be light in weight and shall bepossible to suspend from four corners. Unit shall have an external attractive panel for supply and return air.Unit shall have four way supply air grilles on sides and return air grille in centre. Each unit shall have high liftdrain pump, fresh air intake provision (if specified), low gas level detection system and very low operatingsound.

xi. Ceiling Mounted Ductable Type Unit:-Unit shall be suitable for ceiling mounted type. The unit shall include pre filter, fan section & DX-coil section.

The housing of unit shall be light weight powder coated galvanised steel. The unit shall have high static fan forductable arrangement.

xii. High Wall Mounted Units:-The units shall be high wall mounted type. The unit shall include pre-filter, fan section & DX-coil section. Thehousing of unit shall be light weight powder coated galvanised steel. Unit shall have an attractive externalcasing for supply and return air.

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xiii. Floor Mounted Units:-The unit shall be suitable for floor mounting. The unit shall include, pre-filter fan section, DX. Coil section.The housing of unit shall be light weight powder coated galvanised / anodised aluminium panels. Unit shallhave an attractive external casing with supply & return air grilles.

xiv. Central Remote Controller:-A multi-functional microprocessor based centralized controller (central remote controller) shall be providedfor VRV units control. The controller shall be able to perform following functions:- Temperature setting for each zone, or group, or indoor unit.- On/Off as a zone or individual unit.- The controller shall have wide screen liquid crystal display.

xv. Condensate:-25mm dia uPVC pipes, 40mm dia uPVC headers & fittings shall be used for condensate, from Evaporator Unitto drain point. The joints shall be properly sealed so that there is no water leakage. U-trap shall be provided at

the end. Additional insulation drain tray shall be provided below the Evaporator Unit, if required.

xvi. Mounting:-All indoor units shall be mounted with Brackets, Hangers etc. with proper size anchor Fasteners.

xvii. Electrical installation:-For Variable Refrigerant flow systems, power will be provided to outdoor units. HVAC Contractor to providesuitable distribution panel along with 3-phase power to outdoor units and single phase power to all indoor unitsfed by these outdoor units. Power / control cabling along with supports shall be included.

3.4 Precision Air-conditioning Unitsi. Type:-

The Precision air-conditioning Unit shall be complete with microprocessor controller and shall consist of

hermetically sealed Scroll compressors, evaporator fan, motor, humidifier, strip heaters for winter heating andmonsoon reheat control, integral refrigerant piping and control panel duly wired to compressor and air cooledcondenser all mounted on steel frame. Microprocessor control panel shall be provided with required diagnosticsfeatures and safety interlocks. The Air cooled condenser with fan duly mounted on a common frame shall beinstalled on the wall openings / terrace with suitable angle iron / channel frame to be provided by contractor.The suitable starters, switches, power control cabling between Indoor unit and outdoor unit shall be included bythe contractor.

ii. Compressor and Motor:-Compressor shall be hermetic Scroll, serviceable type. The motor shall be suction gas cooled and shall be sealedagainst dirt and moisture. The motor shall be suitable for 41510% 50 Hz, A.C. supply.

iii. Refrigerant piping and controls:-

Refrigerant piping and fittings interconnecting compressor condenser shall be all copper and valves shall bebrass / gunmetal construction. Piping thickness shall be designed based on type of refrigerant and superheatedgas pressure at full load, corresponding to ambient design temperature.

iv. Casing:-The indoor & outdoor units shall be sectionalized / cabinet construction. Indoor units shall be consisting ofcompressor, fan section, coil section, heater and humidification section, pre/fine filter section, and drain pan.Outdoor unit shall consist of condenser coil and propeller type fan. Each section shall be constructed of thicksheet steel all welded / bolted construction, adequately reinforced with structural members and provided withsufficient access panels for proper lubrication and maintenance. Base panel shall be constructed of fabricatedsteel structure provided with an under frame suitably braced. Each unit shall include one piece drain pan

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constructed of 20 gauge galvanised sheet steel plate. Drain pan shall extend under coil and fan sections withdrain connections. Removable panels in fan and coil sections shall provide access to all internal parts. Casingpanels shall be internally lined with 25 mm thick fiberglass/PUF for the thermal insulation and acoustic lining.The outdoor Air-cooled condenser shall be weatherproof type incorporating high efficiency, direct drive, motorswith axial blade fans. The condenser shall be corrosion resistant through special anti corrosive coatings. Heavyduty mounting legs and all assembly hardware shall be included. Condensers shall be suitable for 24 hoursoperation.

v. Fan motor and drive:-Fan motor shall be AC/DC as per manufacturers standard. Motors shall be especially designed for quiteoperation and motor speed shall not exceed 1440 rpm.

vi. Fan:-Fan wheels and housing shall be fabricated from heavy gauge steel. Fan wheels shall be of forward/backward-curve, multi-blade type enclosed in a housing and mounted on a common shaft. Fan housing shall be made of

die-formed steel sheets with stream-lined inlets to ensure smooth air flow into the fans, fan shaft bearing shallbe oil/grease lubricated. All rotating parts shall be dynamically balanced individually, and the completeassembly shall be statically and hydraulically balanced. Fan speed shall not exceed 1000 rpm and maximumfan outlet velocity shall be 550 meters per minute.

vii. Filters:-The filter chamber shall be an integral part of the system and withdraw able from the front of the unit. Filtrationshall be provided by dry media disposable filters capable of filtering air to 95% down to 5 micron efficiency.

viii. Cooling coil:-Cooling coils shall be of fin and tube type having aluminium fins firmly bonded to copper tubes assembled inzinc coated steel frame. Face and surface areas shall be such as to ensure rated capacity from each unit and airvelocity across each coil shall not exceed 500 FPM. The coil shall be pitched in the unit casing for proper

drainage. Each coil shall be factory-tested at 21 Kg. per sq.cm air pressure under water. Tube shall bemechanically / hydraulically expanded for minimum thermal contract resistance with fins. Number of fins percm. shall be 4 to 5.

ix. Vibration Isolators:-The indoor and outdoor units shall be provided with ribbed rubber pad vibration isolators.

x. Painting:-Units shall be factory finished with durable alkyd spray enamel. Shop coats of paint that have become marredduring shipment or erection shall be cleaned off with mineral spirits, then coated with enamel paint to match thefinish over the adjoining shop-painted surface. Outdoor unit shall be provided with anticorrosive paint suitablefor the site environment.

xi.

Performance Rating:-The unit shall be selected for the lowest operating noise level (65 dBA at 3m). Capacity rating and powerconsumption with operating points clearly indicated shall be submitted and verified at the time of testing andcommissioning of the installation. For site verification of working of humidification / dehumidification systems,set point RH shall be changed below/above (respectively) actual RH. Similar procedure shall be adopted fortemperature control system. Test report shall indicated selected set point for RH and temperature and achievedvalues of these process variables after humidification / dehumidification cycles are activated.

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3.5 Air-cooled package air-conditionersi.

Type:-The Air Cooled Packaged Unit shall consist of hermetically sealed Reciprocating/Scroll compressor, motor,integral refrigerant piping and control panel duly wired to compressor and air cooled condenser all mounted ona steel frame. The Air cooled condenser with fan duly mounted on a common frame shall be installed on thewall openings with suitable angle iron / channel frame to be provided by contractor. The suitable starters,switches, power control cabling between Air Cooled Packaged Unit and Air Cooled Condenser shall beincluded by the contractor.

ii. Compressor and motor:-Compressor shall be hermetic reciprocating/Scroll, serviceable type and shall have dual pressure stat, and anoperating oil charge. The motor shall be suction gas cooled and shall be sealed against dirt and moisture. Themotor shall be suitable for 41510% / volts or 23010 % volts, 50 Hz, A.C. supply.

iii.

Refrigerant piping and controls:-Refrigerant piping and fittings interconnecting compressor condenser shall be all copper and valves shall bebrass / gunmetal construction.

iv. Casing:-The indoor & outdoor units shall be sectionalised / cabinet construction. Indoor units shall be consisting of fansection, coil section, filter section, and drain pan. Outdoor unit shall consist of condenser coil, fan &compressor. The compressor may be mounted within the indoor units if manufacturers standard design. Eachsection shall be constructed of thick sheet steel all welded / bolted construction, adequately reinforced withstructural members and provided with sufficient access panels for proper lubrication and maintenance. Basepanel shall be constructed of fabricated steel structure provided with an under frame suitably braced. Each unitshall include one piece drain pan constructed of 20 gauge galvanised sheet steel plate. Drain pan shall extendunder coil and fan sections with drain connections. Removable panels in fan and coil sections shall provide

access to all internal parts. Panels shall be internally lined with 25 mm thick fibreglass for the thermal insulationand acoustic lining.

v. Fan motor and drive:-Fan motor shall be suitable for 415 10% volts or 23010% volts, 50 Hz, A.C. Supply, Single phase, motorsshall be provided with permanent capacitor. Motors shall be especially designed for quite operation and motorspeed shall not exceed 1440 rpm.

vi. Fan:-Fan wheels and housing shall be fabricated from heavy gauge steel. Fan wheels shall be of double-width,double inlet forward-curve, multi-blade type enclosed in a housing and mounted on a common shaft. Fanhousing shall be made of die-formed steel sheets with stream-lined inlets to ensure smooth air flow into thefans, fan shaft bearing shall be oil/grease lubricated. All rotating parts shall be dynamically balancedindividually, and the complete assembly shall be statically and hydraulically balanced. Fan speed shall notexceed 1000 rpm and maximum fan outlet velocity shall be 550 meters per minute.

vii. Cooling coil:-Cooling coils shall be of fin and tube type having aluminium fins firmly bonded to copper tubes assembled inzinc coated steel frame. Face and surface areas shall be such as to ensure rated capacity from each unit and airvelocity across each coil shall not exceed 500 FPM. The coil shall be pitched in the unit casing for properdrainage. Each coil shall be factory-tested at 21 Kg. per sq.cm air pressure under water. Tube shall bemechanically / hydraulically expanded for minimum thermal contract resistance with fins. The number of finsper cm. shall be 4 to 5.

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viii. Vibration Isolators:-The indoor and outdoor units shall be provided with ribbed rubber pad vibration isolators.

ix. Painting:-Split units shall be factory finished with durable alkyd spray enamel. Shop coats of paint that have becomemarred during shipment or erection shall be cleaned off with mineral spirits, then coated with enamel paint tomatch the finish over the adjoining shop-painted surface.

Outdoor unit shall be provided with anticorrosive paint/coating suitable for the site environment.

x. Performance Rating:-The unit shall be selected for the lowest operating noise level. Capacity rating and power consumption withoperating points clearly indicated shall be submitted with the tenders and verified at the time of testing andcommissioning of the installation.

3.6 Fan Coil Units (FCU)i. Type:-

The fan coil units shall be vertical type for floor mounting, horizontal type for ceiling-suspension. Floor-mounted vertical units shall have vertical top discharge; and horizontal units mounted within ceiling spaceshall have horizontal discharge and shall be ductable. All units shall be complete with chilled water/DXRefrigerant coil, one or more centrifugal fans and motor, cleanable fabric filters, insulated condensatedrain pan.

ii. Cabinets:-Cabinets for floor mounted exposed FCU shall be constructed of 18 gauge die-formed cold-rolled galvanizedsheet steel, bonderized and painted with approved shade of powder coating finish. The cabinets shall be ofsufficient size to enclose all piping and control valves, and shall have access doors to piping and controls.Access panels shall have positive locking fasteners for easy removal. Horizontal furred-in type units mounted

within ceiling space shall be provided with a GI casing of 18 gauge, the coil and fan section with provisionto mount filters within the fan section.

iii. Interior Chassis:-The interior chassis shall be constructed of not less than 16 gauge cold rolled galvanized sheet steel bonderizedand painted with approved shade of powder coating finish. All ceiling suspended vertical fan coil units shall besecurely mounted from the building structure with top panel set dead level in both directions. In case of ceilingsuspended horizontal units fan deck and cooling coil shall be easily removable from FCU without loweringdown of the FCU or disturbing the other installation.

iv. Drain Pan:-Primary drain pan shall be pre-pressed 22 gauge SS-304 and an additional inner bottom panel of 22 gaugeSS-304 shall be provided to prevent damage to, and floatation of the bottom panel insulation. The pan shall

be insulated with not less than 6 mm thick nitrile rubber (class O as per BS 476) insulation shall be effective toprevent condensation. The pan shall be of sufficient size to catch all drippage of condensation from any part ofthe unit. In all cases pan shall be large enough to cover cooling coil supply and return water headers and bends,control valves and ball valves with copper pipes. All drain pans shall be with powder coating finish as perinterior chassis defined above.

v. Cooling Coil:-All cooling coils shall be standard three-row staggered seamless copper tube with aluminum sine wave fins. Thecoil shall be fitted with dielectric coupling for connection with MS pipes by HVAC contractor. Tubes shall beminimum 10 mm OD and wall thickness shall be minimum 0.41 mm. Fin spacing shall be 12 fins per inch. Allbends and joints shall be enclosed within insulated end sections of the base unit for protection against sweating.

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Tubes shall be mechanically expanded for minimum thermal contact resistance with fins. Air vent shall beprovided in headers at a level higher than coils. The cooling coil shall be easily removable from back side ofFCU along with fan section without disturbing the Installations. All coils shall be factory tested at 21 KG persq. cm (300 psig) air pressure while submerged in water.

vi. Fans:-Fans shall be centrifugal forward curve DIDW, direct/belt driven by a fractional horse power motor.

vii. Motor:-Motor shall be 220 6% volts, 50 cycles single phase, energy efficient, six pole, shaded pole type, speednot exceeding 1000 rpm at maximum airflow. Motors shall have three speed windings and shall be factorywired to a terminal block mounted within the fan section. Motors shall have extended shaft on both sides.

viii. Installation:-Ceiling suspended horizontal units and units mounted within the ceiling space shall be hung through rubber-in-

shear vibration isolator suspenders.

ix. Painting:-Shop coats of paints that have become marred during shipment or erection shall be cleaned off with mineralspirits, wire brushed and spot primed over the affected areas, then coated with enamel paint to match the finishover the adjoining shop painted surfaces.

x. Performance Data:-Fan coil units shall be selected for the lowest operating noise level having standard sound level rating of NC 30 atlow speed and NC 35 at medium/high speed. Fan performance rating and power consumption data, with operatingpoints clearly indicated, shall be submitted by the Contractor and verified at the time of testing andcommissioning of the installation.

xi.

Testing:-Cooling capacity of various fan coil unit models shall be computed from the measurements of air flow and dryand wet bulb temperatures of air entering and leaving the coil. Flow measurements shall be by anemometerand temperature measurements by accurately calibrated mercury-in-glass thermometers. Computed ratingsshall conform to the specified capacities. Power consumption shall be computed from measurements ofincoming voltage and input current.

3.7 Split Type Air-Conditionersi. The unit offered shall be by a reputed manufacturer who is represented locally and can provide an efficient

maintenance and spare part service. The units shall meet the specified duties for air flow and cooling capacities.

ii. The casing shall consist of a heavy gauge steel chassis with sheet metal casing. The minimum thickness shall be

1.2 mm. The whole unit shall be protected against corrosion and finished inside and outside with stoned primerand paint. The casing for the inside unit shall be the same as mentioned above or of rigid plastic as supplied bythe manufacturer.

iii. The fan shall be of the forward curved centrifugal type. The air filters shall be of nylon fibre / glass fibrematerial or as supplied by the manufacturer. The filter shall be easily removable for cleaning. The inside unitfan and condenser fan motors shall factory lubricated bearings of the sealed for life type. The motor windingand electrical components shall be impregnated or protected to avoid problems with condensation. Thecompressor in the outside unit shall be the hermetically sealed pattern complete with resilient mountings. Thecondenser and evaporator coils shall be formed of copper primary tubes with aluminium fins or copper fins. Ifcopper fins are used they shall be electro -tinned after manufacture. The fins shall be mechanically bonded to

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the tubes. The unit shall have control giving three running speeds and an off position. The outlet grille shall befully adjustable to enable the direction of airflow to be set to the desired direction. Where the units are floormounted the supply grilles shall be on the top of the unit.

iv. The units shall be installed in accordance with the manufacturer's recommendations to unit location, refrigerantpiping, power and condensate piping. Where the units are of the concealed type the CONTRACTOR shallensure adequate access is provided for the removal of a complete unit. The condensate pipe work shall be run tothe nearest drain.

v. The air conditioning unit shall be capable of handling the cooling loads when operating in design ambientconditions at the medium speed. The outdoor unit shall be designed to operate at outdoor ambient designtemperature of site. The safety devices for the compressors shall be as per the manufacturer's recommendations.

3.8 Centrifugal Pumpsi. Capacity:-

All pumps shall be of capacity & size in accordance with the requirements worked out by the CONTRACTOR.The equipment shall be capable of developing the required total head at rated capacity. The pump shall be suitablefor parallel operation & should not overload in single pump operation.

ii. Casing:-Pump casing shall be of heavy section grained cast iron, making possible complete servicing of rotating partswithout breaking piping or motor connections. Motor to pump connection shall be of the flexible coupling type.Suction passages shall be such to promote smooth entry to impeller and increased efficiency. The casing jointingfaces shall be fully machined and shall be with a gasket. Pump casing shall be designed to withstand dischargepressure plus static head of system.

iii. Impeller:-The pump impeller shall be of bronze or other suitable material, hydraulically balanced and passages smoothfinished for minimum friction and maximum efficiency. Wherever rings are fitted to the impeller, these shall be ofthe same material as of impeller and shall be secured from relative movement by tongue and groove fittings.

iv. Bearings:-The bearings shall be heavy duty ball or roller type, suitably designed to take radial & axial loads & for the dutyinvolved. Oil level indicators shall be provided for pump. Bearings shall be effectively sealed against the entranceof dust, moisture and leakage of lubricant. Bearing shall also be easily approachable without disturbing the shaftalignment.

v. Shaft and Seals:-The pump shaft shall be of High tensile steel (SS 304), protected by S.S sleeves. Shaft shall be finished to closetolerance for the impeller, coupling & bearing diameters. The impeller, pulley & shaft sleeves shall be firmly

secured to the shaft by key / lock nut.

The shaft shall be sealed by faster fitted mechanical seal. The seal shall allow zero leakage.

vi. Fittings and Pressure Gauges:-Pumps shall be provided with two air valves, drain plug and water seal connections. Pressure gauges at suctionand delivery shall be provided. Pipe connection shall be flanged type and suction & discharge shut-off valve anddischarge check valve shall be provided with each pump. Coupling - Pump / Motor coupling shall be flexiblespacer type to allow dismantling without disturbing the pump & motor positions. Coupling guard shall beprovided for safe operation.

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vii. Alignment:-All pumps shall be factory-aligned prior to shipment by the manufacturer. Prior to testing, the pump alignmentmay be verified for each pump with a dial indicator within 0.05 mm for each pump.

viii. Motor:-Motor shall be as per motor specification. The bidder shall select their drives suitable for parallel operation asrequired by design. Motor shall be provided with heavy duty bearing with easily access able grease nipple.

ix. Painting:-All pumps, motors and bases shall be supplied with approved finish. Paint that has become marred duringshipment or erection shall be cleaned off, coated with enamel paint to match the adjoining areas.

x. Performance Data:-Each pump shall deliver not less than the quantity of water required against the total head of the system asinstalled. The supplier shall supply with his offer a copy of the guaranteed characteristic performance curves for

each pump.

3.9 Air Handling Uniti. The air handling unit shall be of double skin sectionalized/cabinet construction. Unit casing shall be thermally

insulated. The air handling units shall be double skin construction, draw-thru type comprising of varioussections, filter section, coil section and fan section, mixing box, (wherever the return air is ducted). Airhandling unit shall be of blow thru configuration, in case, placed outside in ambient environment.

ii. Double skinned panels shall be 23 / 46 mm thick made of galvanized steel, pressure injected withfoam insulation (density 38/40 kg/m3) shall be fixed to 1.5 mm thick aluminium alloy twin box sectionstructural framework with stainless steel screws. Outer sheet of panels shall be made of galvanised

preplasticised sheet of 0.63 mm thick, and inner sheet of 0.63 mm thick plain G.I. Sheet. AHUs such asTFA units, AHU with mixing box having return air ducted or AHU which are placed outside shall be providedwith thermal break profile. Also these AHUs shall be provided with minimum 46 mm thick panel.

iii. Entire framework shall be mounted on an aluminium alloy or galvanized steel (depending on size) channel baseas per manufacturers recommendation. The panels shall be sealed to the framework by heavy duty gaskets heldcaptive in the framed extrusion. All panels shall be detachable or hinged. Hinges shall be made of die castaluminum/hard nylon with stainless steel pivots, handles shall be made of hard nylon and be operationalfrom both inside and outside of the unit. Units supplied with various sections shall be suitable for on siteassembly with continuous foam gasket. All fixing and gaskets shall be concealed.

iv. Units shall have hinged, quick opening access door in the fan section and also in filter section where filters arenot accessible from outside. Access doors shall be double skin type. Condensate drain pan shall be fabricated

from 18 gauge stainless steel sheet with all corners welded.

v. AHUs requiring mixing boxes shall be complete with fresh and return air dampers.

vi. AHU Dampers shall be opposed blade type. Blades shall be made of double skinned aerofoil aluminiumsections with integral gasket and assembled within a rigid extruded aluminium alloy frame. All linkages andsupporting spindles shall be made of aluminium or nylon, turning in teflon bushes. Manual dampersshall be provided with a bakelite knob for locking the damper blades in position. Linkages shall be extendedwherever specified for motorised operation. Damper frames shall be sectionalised to minimise blade warping.Air leakage through dampers when in the closed position shall not exceed 1.5% of the maximum design airvolume flow rate at the maximum design air total pressure.

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vii. For direct expansion units, damper section shall have face & bypass dampers. Bypass area shall not be less than1/4th of the face area.

viii. Filter section shall be provided with cleanable synthetic media filters. Filters shall be selected for a pressuredrop of 4 mm WG maximum in clean condition. Filters shall be capable of filtering dust from mixture of returnand fresh air up to 10-micron dust particles with an efficiency of 90%.

ix. Fan motors shall be energy efficient and shall be 41510% volts, 50 cycles, three phase, totally enclosed fan-cooled class F, with IP-55 protection. Motors shall be especially designed for quiet operation and motor speedshall not exceed 1440 rpm. Drive to fan shall be provided through belt-drive arrangement. Belts shall be of theoil-resistant type.

x. Fans shall be centrifugal, backward curved so as to give maximum efficiency for given duty condition. In caseof ceiling suspended units with low static pressure requirement, forward curved fans may be used. Fans shall be

selected for maximum efficiency. Fan casing shall be made of galvanised steel sheet. Fan outlet velocity shallbe restricted within 9.2 m/s. Fan wheels shall be made of galvanised steel. Fan shaft shall be grounded C40carbon steel and supported in self-aligning plummer block operating less than 75% of first critical speed,grease lubricated bearings. Fan wheels and pulleys shall be individually tested and precision balanceddynamically. Fan motor assembly shall be statically and dynamically balanced. Computerized fan selectionprint outs shall be submitted along with the offer. Both fan and motors assemblies shall be mounted on a deepsection aluminium alloy or galvanised steel (depending on size) base frame. Combination spring and rubber antivibration mounts shall be provided for isolating the unit casing. Frame retardant, waterproof silicone rubberimpregnated flexible connection shall be provided at the fan discharge.

xi. Cooling coil shall be minimum 4 rows deep. Chilled water coils shall have 12.5 to 15 mm dia (O.D )tubesminimum 0.4 mm thick with sine wave aluminium fins firmly bonded to copper tubes assembled in zinccoated steel frame. The coil shall be pitched in the unit casing for proper drainage. The coil shall have copper

header with chilled water supply & return connections protruding out of AHU casing by minimum 150 mm andfitted with dielectric coupling for connection with MS pipes. Each coil shall be factory-tested at 21 kg per sq. mair pressure under water. Tube shall be hydraulically/mechanically expanded for minimum thermal contactresistance with fins. In case AHU has multiple coil stacked one above another, intermediate drain of SS 304(18 gauge) shall be provided so that upper level of coil drains into this train. Copper / SS 304 piping shall beprovided from this train upto main bottom tray.

xii. Fine filters, if called for in design basis, shall be of minimum efficiency of 95% down to 3 micron. Fine filtershall be provided in blow thru mode w.r.t. AHU fan. Alternatively, if space does not permit, fine filters may beprovided in supply air plenum outside AHU.

xiii. Each air handling unit shall be provided with manual air vent at high point in the cooling coil and drain plug inthe bottom of the coil. In addition, the following accessories may be required at air handling units:--

Insulated butterfly valves, balancing valves, `Y strainer, union & condensate drain piping with U trapupto sump or floor drain in air handling unit room.- Temperature Gauge in the thermowells & pressure gauge (with cocks) within gauge ports in chilled water

supply and return lines.- Water resistance marine light with power cabling.- Vibration isolators shall be provided with all air handling units. Vibration isolators shall be cushyfoot

mounting type. Minimum vibration isolation efficiency shall be 90%.

xiv. A weather proof canopy shall be provided for the unit, if the unit is required to be located outdoor.

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3.10 Filtersi.

Pre-Filters (G4)Pre-filters shall be installed in fresh air intake of fans and AHUs. The filter shall be capable of filtration of dustparticles up to 10 micronswith an efficiency of 90%. The filter shall be made of non-woven synthetic mediaand shall be capable of being washed repeatedly for re-use. The media shall return its shape, size and thicknesseven after repeated washing. The media shall be easily removable for washing. The filter shall conform to G-4of EN-779. The filter housing shall be made of aluminium frame or electro-galvanized steel frame.

ii. Fine Filters Panel/Flange Type (F7)Fine filter shall be flanged type having efficiency of 95% down to 3 micron. Filter media shall be importedsynthetic medium supported by HDPE mesh and Al-mesh. Casing for filter shall be Anodised Aluminium.Maximum initial and final pressure drop shall be 8 mm to 20 mm. Sealing medium shall be epoxy.

3.11 Heating UnitHeating shall be preheating and / or reheating as per psychometric process requirement. Heating shall beelectric heater type. Electric strip heaters shall be complete with heating thermostats/ humidistat, safetythermostats and contactors. Hot water / steam coils shall be complete with control valve, humidistat/ thermostat,etc.

3.12 Humidifier UnitHumidifier shall be steam pan type. Pan humidifier shall be complete with immersion type electric heatersactuated by humidistat, water float valve, stop valve in water make up line, level switch interlocked withheaters. Pan shall be fabricated with 3 mm stain less steel sheets. The outer surfaces shall be thermallyinsulated. The humidifier shall be sized to deliver 110% of capacity required. Humidifier provided as a part ofprecision AC shall be as per manufacturers standard.

3.13 Expansion TankExpansion tank shall be provided in chilled water system and installed atleast 1 m above the highest point of thesystem. Tank shall be of size 800 x 800 x 800 mm minimum (unless otherwise required because of systemdesign requirement) fabricated from 6 mm thick carbon steel plates in welded construction. The tank shall becomplete with float valve assembly backed up with gate valve for make up, quick fill gate valve, drain withvalve and overflow. Tank shall have rigid supporting arrangement of structural steel per IS 2062 / ASTM A36.The tank shall be suitably insulated as per specifications.

3.14 Ventilation Fans3.14.1 General

i. All fans shall be furnished with fans, drivers, drive components and all necessary accessories that arerequired for the specified service.

ii. The fans shall not be rated in the surge area on the left of peak head of performance curve.iii. Belt driven fans shall be fitted with pulleys suitable for V -belts. The pulleys shall be fixed by taper

lock type bushes and shall be secured to the fan and motor shaft by keys fitted into machined keyways.iv. All fans which are too large or heavy to be man handled, safety shall be provided with eyebolts or

other lifting facilities to enable mechanical lifting equipment to be used.v. The whole fan assembly shall be fully finished against corrosion.vi. Access shall be provided to carry out all necessary maintenance required.

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vii. The electrical terminal box shall be located to allow for easy connection and disconnection theelectrical supply.

viii. Where required suitable guards shall be installed to protect against all moving parts including themotor.

ix. All motors are to be positioned to permit effective ventilation of the motor and all components of thefan and motor are to be suitable to withstand the temperature conditions expected.

x. All fans shall be installed to avoid vibration and noise to the ductwork or building fabric.xi. Each fan motor shall be designed to drive its respective fan when the fan is operating at a

speed or pitch angle 10 % in excess of that required to meet the fan performance.xii. Wherever required, flexible connections shall be installed at both the inlet and outlet of each fan.xiii. All exhaust fans shall be provided with an electrical isolator adjacent to the unit.xiv. The fan motors shall be insulated to a minimum of a Class 'B' insulationxv. All fans shall be capable of operating at ambient temperatures of 50 C and the casing material shall be

able to withstand sun radiation temperature up to 85 C.

3.14.2

Centrifugal Exhaust Fans

i. Centrifugal fan shall be DWDI / SWSI Class I construction arrangement 3 (i.e. bearings on both thesides) for DWDI fans, squirrel-cage induction motor, V-belt drive, belt guard and vibrationisolators, direction of discharge / rotation, and motor position shall be as per the Approved-for-Construction shop drawings.

ii. The fan housing shall be rigidly built and braced. Where the fan scroll is 450 mm or more in width, anaccess door with frame and gasket shall be provided. All access doors shall be fabricated so that theinner surface is flush with the inside of the fan scroll.

iii. The fans shall not produce excessive noise as compared to units of like size and power when used withthe specified vibration isolation.

iv. The fan manufacturer shall provide for approval for each fan, certified sound power ratings with anoctave band analysis and also the volume, horsepower, pressure characteristic curves from shut-off to

free delivery.v. Fan Wheel shall be backward-curved non-over loading type. Fan wheel and housing shall be statically

and dynamically balanced. For fans upto 450 mm dia, fan outlet velocity shall not exceed 550meter/minute and maximum fan speed shall not exceed 1450 rpm. For fans above 450 mm dia, theoutlet velocity shall be within 700 meter/minute and maximum fan speed shall not exceed 1000 RPM.High static pressure fan speed shall be as per manufacturer standard.

vi. The fan impeller shall have ample strength and shall be statically and dynamically balanced to avoidvibration.

vii. The blades shall be designed to ensure quiet and efficient operation. The fans shall be V-belt drivenunless otherwise indicated.

viii. The motor pulley shall be an adjustable type for two (2) grooves or less. Drives requiring three (3)grooves or more shall be the variable pitch type.

ix. Drives for fractional horsepower motors may have one belt rated at 200 % of motor horsepower. All

other fans shall have not less than two belts and shall have sufficient capacity to drive the fan with onebelt broken.x. The fans shall be provided with belt and pulley guards manufactured of perforated metal or other

approved material. Covers shall be provided in the guard for the fan and motor shafts for ease of takingtachometer readings without removal of the guard.

xi. The fan motor shall be sized to drive its respective fan when the fan is operating at a speed 10 % inexcess of that required to meet the fan performance. No motor shall operate within the service factor.

xii. All fans discharging directly up though the roof shall be equipped with a 40 mm casing drain whichshall be connected to the nearest floor drain.

xiii. All fans shall be factory coated with one coat of primer and one coat of machine enamel. The interiorof the fans shall be painted as per the manufacturer's standard.

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xiv. The fan shaft shall be supported by least two roller or ball bearings with easy access to the lubricationpoints where required.

xv. All fans scheduled to be located outdoors shall be furnished with weather proof motor and drivehousings. Also fans shall be provided with anti-corrosive coating/paint.

3.14.3 Axial Exhaust Fans

i. Axial flow fans shall be capable of giving the design flow when tested to BS 848.ii. The fan casing shall be constructed of mild steel plates with angle stiffeners, with the easing hot dip

galvanized after manufacture.iii. The inlet and outlet of the axial flow fans shall be flanged for connection to the system.iv. The casing shall cover both impeller and motor so that the fan can be removed without disturbing

adjacent ductwork or other components of the system.v. A flame proof external terminal box shall be fitted on the casing.vi. All lubrication points shall be extended to outside the casing and in a position that will permit easy

access.vii. The impellers shall be die cast in aluminium or cast steel.viii. The impeller shall be capable of running continuously at 20 % in excess of the rated speed.ix. The impeller shall be keyed and locked to the shaft, which shall be statically and dynamically balanced

and tested at over speed prior to dispatch from the manufacturer's works.x. The blade angle shall be adjustable over at least a 30 range with markings at the base to indicate the

blade angle.xi. The speed of the fans shall not exceed 1000 RPM for fans with impeller diameter above 450 mm, and

1440 RPM for fans with impeller diameter 450 mm and less. For lowest sound level, fan shall beselected for maximum efficiency or minimum horsepower. Motor conduit box shall be mounted onexterior of fan casing, and lead wires from the motor to the conduit box shall be protected from the airstream by enclosing in a flexible metal conduit.

xii. All motors are to be positioned to permit effective ventilation of the motor and all components parts of

the fan and motor are to be suitable to withstand the temperature conditions expected.xiii. A suitable support is to be provided for each fan. The frame is to be fabricated from rolled steel

channel with adequate cross members for bolting the fan in position.xiv. Anti-vibration mountings and flexible connection shall be provided to isolate the fans from the

adjacent ductwork and building fabric.xv. Fan shall be provided with anti-corrosive coating suitable for site environment.

3.14.4 Wall and Window Mounted Exhaust Fans

i. Exhaust fan shall be of the propeller type suitable for wall/window mounting.ii. The fan construction shall be of molded plasticiii. Motors shall be of the shaded pole induction type enclosed in aluminium alloy case and protected by a

thermal over load cut out.

iv.

The motor bearings shall be self alignment sealed for life type.v. The fans shall be provided with a solenoid operated back draught shutters. The solenoid shall open andclose the back draught damper silently as the fan is switched ON and OFF.

vi. Fan shall be provided with anti-corrosive coating suitable for site environment.

3.14.5 Propeller Type Exhaust Fans

i. The impeller shall be of steel or aluminium and the blades shall be fixed to the hub or the blades andhub shall be formed in one piece.

ii. The bearings shall be ball, roller or sleeve type sealed for life or with accessible lubrication points.iii. The propeller fans may be ring mounted or diaphragm mounted in a casing. The casing shall be longer

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than the length of the motor and fan.iv. The casing shall be of steel construction with flanged ends and shall incorporate an inspection door.v. The terminal box shall be mounted externally on the casing.vi. The tip speed of the fans shall not exceed 20 m/s.vii. Accessories : The following accessories shall be provided with propeller fans :

a. Wire guard on inlet side and birdscreen at the outlet.b. Fixed or gravity louvers built into a steel frame at the outlet.c. Regulator for controlling fan speed for single phase fan motor.d. Single phase preventors for 3 phase fans.

viii. Fan shall be provided with anti-corrosive coating suitable for site environment.

3.14.6 Kitchen and Smoke Exhaust Fans

i. The fans shall be especially designed for smoke and kitchen exhaust.

ii.

The fans can be either belt or direct driven with the motor fixed on resilient mountings outside the airstream.

iii. Kitchen exhaust fans shall be fitted with a housing drain and grease trap easily removable for cleaning.iv. The fans shall be suitable for removal of smoke and grease laden vapors. Fan shall be provided with

anti-corrosive coating suitable for site environment.

3.14.7 Protectively Coated Exhaust Fans for Corrosive or Hazardous Use

i. Where the fans are required to handle corrosive toxic flammable explosive or high temperature gasesthe materials and construction shall be required to suit the application and all relevant safetyregulations shall apply. Fan shall be of spark-proof construction.

ii. Bearing and lubrication arrangements shall be suitable for the conditions expected.iii. Protective coating is required to use with corrosive gases the coating shall cover all parts of the

complete fan, motor and casing assembly which will be in contact with the corrosive gases.iv. No fan shall be installed if the protective coating has been damaged in any way.v. The fan motors for hazardous use or required to handle flammable or explosive gases shall be flame

proof.

3.14.8 Power Roof Ventilator

i. Ventilator fan shall be centrifugal, direct drive or belt driven type.ii. Fan wheel shall have backwardly curved blades and made of aluminium. Inlet cone shall be provided.iii. Motor compartment cap, fan shroud and curb base cap shall be of heavy gauge aluminium. Discharge

end shall be equipped with galvanized bird screen.iv. Fan and drive shall be out of stream. Fan, its drive and the support frame shall be mounted on vibration

isolators. When steel frame is provided, it shall be heavy gazed galvanized steel.

v.

When roof curb is specified, it shall be made of aluminium or galvanized steel and shall be of waterproof. Wood strip shall be equipped on top of curb.

4.0 SPECIAL REQUIREMENTS FOR HAZARDOUS AREA APPLICATIONi. All the air-conditioning and ventilation equipment shall meet the area classification requirement of

respective area in which they are being installed.ii. General requirements for hazardous area application:

a. All electrical equipment such as motor, heaters, switchgear, control system shall be of flameproof type and shall be suitable for the area classification of respective area in which they are

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being installed.b. All rotating equipment (fans, compressor etc.) shall be of spark-proof construction. Ideally

rotating parts should be constructed of non-ferrous material. If ferrous material is used for twomating/intended for rubbing during operation, they should be provided with non-ferrousmaterial coating/lining to eliminate any possibility of spark generation while operation.

c. If, belt driven, anti-static belts shall be used.

5.0 DUCTING5.1 General

The air distribution systems should be designed to stay within the established limits of pressure drop, velocityand sound level to transmit the required flow rate to each space, while maintaining proper air distribution. Thefollowing items directly influence the first costs and operating costs:

Heat gain or loss from the duct

Aspect ratio of the duct

Duct friction rate

Type of fittings

Both horizontal branch and low-pressure ducts shall be designed by the Equal Friction" method with a pressuredrop less than 2.5 mm WG/30 m. Duct velocity shall not exceed 7.6 m/sec for main supply air duct and 5.0m/sec for return air duct. For branch ducts leading to diffusers, velocity shall be restricted to 4.0 m/sec. Alloutlets / diffusers shall be designed with a terminal velocity not exceeding 3.0 m/sec. Manufacturers publisheddata shall be taken into account for proper air throw/distribution, noise, and pressure drop. Selection must bemade to ensure sound levels below NC 35. Sound attenuators shall be installed in ducts, as required. An orderlyprocedure, necessary for the design of air conditioning or ventilating systems requiring ducts, may be outlinedas follows:

A careful study of the plan of the building and the elevations in order to design the most convenientsystems.

Avoidance of all obstructions for maintenance and access to other plant services.

Keeping the design simple with gradual bends and gradual transitions.

Arrangement of duct outlets to ensure proper distribution of the air in the space to be ventilated.

Determination of size of outlet, based on volume of air required, number of outlets required, allowablevelocity, and angle of throw. Ensure that all grilles or registers have an adequate free area.

5.2 Ductwork MaterialsA. Construct ductwork from galvanized sheet steel, lock forming quality, with 120 grams per square meter of

zinc-coating (Class VIII as per IS 277).B. Aluminum ductwork, fittings or attachments will be limited to shower, laundry dryer exhaust and

washroom exhaust air systems.

C.

For lined ductwork, liner shall be fiberglass type with erosion-proof neoprene facing conforming to TIMA(Thermal Insulation Manufacturers Association) AAC-101. Attach liner to ducting surface with adhesiveand fasteners

D. Duct sealants shall have a maximum flame spread rating of 25 and smoke develop rating of 50, in the drystate conforming, to ASTM E84, and be fire resistive and nonflammable in accordance with ASTM D93when wet.

E. Duct tape alone for sealing purpose will not be permitted.

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5.3 Fabricated Duct ComponentsA.

Shop-fabricated ductwork in conformance with SMACNA HVAC Duct Construction Standards-Metal andFlexible.1. Conform to standard requirements of SMACNA for metal thickness, reinforcing, joints and sealing for

maximum system static pressures as indicated on the drawings and specification. Minimum duct metalthickness used shall be at least 26 gauge.

2. Except where otherwise indicated on the drawings, construct ductwork as follows:a. Design for positive 750Pa static pressure for supply ductwork.b. Design for negative 50Pa static pressure for return ductwork.c. Design for negative 50Pa static pressure for exhaust ductwork.

3. Rectangular ductwork shall have standing seam joints, angle bracing and companion angleconnections. Round ductwork shall have spiral seam to 1220 mm diameter and welded longitudinalseam for larger than 1220 mm diameter. Provide beaded sleeve or flanged and gasketted joints forround duct.

4.

Duct shall be in level from bottom. Taper pieces shall taper from top.5. Watertight duct construction shall have all continuously welded seam.6. Hangers and supports shall be galvanized steel angle with galvanized steel rods with sizes and

configuration in accordance with ASHRAE Standards. Maximum spacing between hangers shall notexceed 3 meters. Trapeze hangers shall be used for rectangular ductwork and belly band hangers usedfor round ductwork.

B. Fittings shall conform to the following:1. Elbowsa. Provide long radius type with centerline radius minimum of 1.5 of duct width.b. Provide short radius or square elbows where indicated, or where required to fit restricted spaces.c. Provide turning vanes on all short radius elbows.d. Provide double thickness vanes on square elbows and elbows with face area over 0.08 m2.

e.

Where acoustical lining is provided, provide turning vanes of perforated metal type with fiberglassinsulation inside.

2. Parallel Flow BranchesProvide long radius takeoffs at parallel flow branches, or square elbows where indicated.

3. Branch ConnectionsProvide 45 entry, or conical taps. Butt taps are not permitted.

5.4 Flexible DuctworkA. Flexible ductwork shall be spiral wound flexible non-metallic material with 25 mm thick, 24 kg per cubic

meter, factory applied flexible glass fiber thermal insulation conforming to UL 181 Class I and NFPA 90A.B. Maximum leakage shall be 1 percent at 1-1/2 times working pressure.C. Maximum length from takeoff to air outlet shall not exceed 3 meters.D. Maximum one 90 bend in any length.

E.

Provide continuous length with no intermediate joints.F. Connect each end with stainless steel screw operated drawbands.G. Support ductwork for maximum sag of 42 mm per meter and clear of the ceiling tile, light fixtures and air

terminals.

5.5 Plenums and CasingsA. Construct plenums and casings to withstand either a negative or positive static pressure of 1500Pa.B. All outdoor located plenums and casings shall have weather-proof and watertight construction.C. Single wall plenums and casings shall be constructed 18 gauge galvanized steel sheet, standing seam

construction and with suitable steel angle reinforcement.

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D. Double-wall plenums and casings shall be constructed of minimum 25 mm thick prefabricated insulatedpanel assemblies 18 gauge galvanized steel outer sheets. Provide 25 mm thick high density rigid glass fiberinsulation conforming to NFPA 90A with maximum flame spread of 25 and smoke developed of 50.

E. Construct doors of same material as casings and of minimum size 510 mm x 1370 mm and with airtightneoprene door seal.

F. Provide 250 mm x 250 mm wire reinforced double pane windows with airtight gasket.

5.6 Access DoorsA. Provide access doors in casings, plenums and ducts where required for ready access to operating parts

including fire dampers, smoke dampers, valves and concealed coils.B. Construct and install access doors in accordance with SMACNA standards to suit the static pressure

classifications and the locations where installed.C. Access door shall be constructed of the same material as duct but of one sheet metal gauge heavier and of

minimum 20 gauges thick complete with sheet metal angle frame. For insulated ducts, door shall be of

sandwich construction and complete with insulation.D. Access doors shall have neoprene or close-cell rubber type gaskets, piano hinges and quick acting lockingdevices. Fabricate access doors with two butt hinges and two sash locks for sizes up to 450 mm, two hingesand two compression latches with outside and inside handles for sizes up to 610 mm x 122 mm andadditional hinge for larger siz

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G3IR-1000-35-SP-9001_R1.PDF