Installation and Operation Instructions for Mighty Therm · 2012. 1. 4. · Sizes 500-1825 These instructions are to be stored in the pocket provided on the boiler. ... Introduction

FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,qualified in hot water heater installation and maintenance. Improper installation and/or operation couldcreate carbon monoxide gas in flue gases which could cause serious injury, property damage, or death.Improper installation and/or operation will void the warranty.

WARNINGIf the information in this manual is not followed exactly, a fire or explosion may resultcausing property damage, personal injury or loss of life.

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this orany other appliance.

WHAT TO DO IF YOU SMELL GAS• Do not try to light any appliance.• Do not touch any electrical switch; do not use any phone in your building.• Immediately call your gas supplier from a nearby phone. Follow the gas supplier's

instructions.• If you cannot reach your gas supplier, call the fire department.

Installation and service must be performed by a qualified installer, service agency, or gassupplier.

Installation and OperationInstructions for

Mighty Therm

Volume Water HeatersModels VW, PW and IWSizes 500-1825

These instructions are to be stored in the pocket provided on the boiler.

H01

0500

0D

Installation and Operation Instructions Document 2040D

LAARS HEATING SYSTEMSPage 2

SECTION 1.General Information1A. Introduction................................................... 31B. Heater Identification ..................................... 31C. Flow Requirements ...................................... 41D. Water Chemistry ........................................... 4

SECTION 2.Installation2A. Heater Placement ......................................... 42B. Installation of Indoor Heaters ....................... 42B-1. Combustion Air Supply ................................. 62B-2. Venting ......................................................... 62C. Installation of Outdoor Heaters ..................... 72D. Gas Supply and Piping ................................. 72E. Electrical Wiring ............................................ 82F. Water Piping of System ................................ 82G. Water Expansion .......................................... 92H. Pump Performance and Installation ........... 102I. Water Pressure .......................................... 162J. Tank Installation ......................................... 162K. Two-Temperature System .......................... 16

SECTION 3.Operation3A. Controls - General ...................................... 163B. Initial Start-Up ............................................. 17

TABLE OF CONTENTS

3C. To Start Up System .................................... 183D. To Turn Off Heater ....................................... 193E. To Shut Down System ................................ 19

SECTION 4.Maintenance

................................................................... 19

SECTION 5.Troubleshooting and Analysis ofService Problems

................................................................... 20

SECTION 6.Parts Descriptions and Order Numbers

................................................................... 22

SECTION 7.Outdoor Parts Descriptions andOrder Numbers

................................................................... 30

SECTION 8.Optional Parts Descriptions andOrder Numbers

................................................................... 32

Mighty Therm Volume Water Heater Page 3

SECTION 1.General Information

1A. IntroductionThis manual provides information for the

installation and operation of Laars volume waterheaters. It is strongly recommended that all applicationand installation procedures be reviewed completelybefore proceeding with the installation. Consult theLaars factory, or local factory representative, with anyproblems or questions regarding this equipment.Experience has shown that most problems are causedby improper installation.

Some accessory items are shipped in separatepackages. Verify receipt of all packages listed on thepackage slip. Inspect everything for possible damageupon delivery, and inform the carrier of any shortagesor impairments. Any such claims should be filed withthe carrier. The carrier, not the shipper, is responsiblefor shortages and damage to the shipment whethervisible or concealed.

WARNINGAll volume water heaters must be installed inaccordance with the procedures outlined in thismanual. The warranty does not apply toheaters not installed or operated in accordancewith these procedures. Consult local buildingand safety codes before proceeding with work.The installation must conform to therequirements of the authority having jurisdictionor, in the absence of such requirements, to thelatest edition of the National Fuel Gas Code;ANS1 Z223.1, National Electrical Code ANSI/NFPA 70 and/or in Canada CAN1-B149requirement.When required by the authority havingjurisdiction, the installation must conform toAmerican Society of Mechanical Engineerssafety codes for controls and safety devices forautomatically fired heaters No. CSD-1, and inCanada CGA 3.3. Any modification to the waterheater, its gas controls, gas orifices, wiring ordraft diverter may void the Laars warranty. Iffield conditions require such modifications,consult factory.

1B. Heater IdentificationConsult rating plate on the heater. The following

example simplifies the heater identification.

1 2 3 4 5 6

PW 1670 I N 09 C

1. Basic heater model.*2. Input rate X 1000 BTU/hr.3. Indoor (I) or Outdoor (E) installation.4. Gas type: Natural (N) or Propane (P).5. Ignition system: I.I.D. (09) or continuous pilot

(16).**6. Firing rate: On/Off (C), 2-stage (K), 4-stage (L).

*Model VW water heaters for use with separatestorage tank. There must be a field installed pump tocirculate water between the heater and the storagetank.

*Model PW water heaters are basically the sameas the VW series except that the PW heaters comewith integrally mount pumps.

*Model IW water heaters are tanklessinstantaneous heaters, complete with mount pump foruse in applications having a suitable diversity in heaterload.

**Special Options: I.I.D. (04) 115 volts.Laars commercial water heaters are available in

two models: an indoor version and an outdoor version.Both are available from the factory (see Figure 1).

Figure 1. Boiler Configuration.

Pump12¼(311)

GasConn.

A

Fro

nt

Top

V

10¼(260)

295/8(752)

58(1473)

C

17(432)

28¼(718)Side

17¾(197)

RearOut In

29(737)

B

Pump(PH Models)

19(483)

GasInlet

12(305)

A

Front

30¾(781)

61(1549)

Out In

14(356)7¾

(197)

41¾(1060)Side

4(102)


1C. Flow RequirementsFor proper operation, all low volume hot water

heaters must have continuous flow through the heatexchanger when firing. The system pump must becapable of developing sufficient pressure to overcomethe resistance of the heater plus the entire circulatingsystem at the designed flow rate.

1D. Water ChemistryLaars equipment is designed for use in a wide

variety of water conditions. The water velocitymaintained in the heat exchanger tubes is kept highenough to prevent scaling from hard water and lowenough to avoid corrosion from soft water. Ninety-five percent of the urban areas in the country havewater that is compatible with this equipment, but insome areas a water supply will contain a large quantityof scaling chemicals or the water may be extremelysoft and corrosive. In rare situations the water willcontain both scaling chemicals and corrosivechemicals such as calcium or sodium chloride. Theseconditions may be the result of a nearby well orpumping station and the particular condition may notbe characteristic of the entire city water system.

If an installer observes damage from theseconditions to any water handling equipment in thearea, a factory representative should be contactedimmediately for assistance in minimizing maintenancecosts. If erosion is present, the pump impeller can bereplaced to reduce water velocity. If scaling conditionsare bad, tube cleaning maintenance schedules can beestablished to prevent tube burn-out and cracking.Neglecting the problem could mean serious damage tothe heater and water system.

Scaling can be recognized as a layer depositedon the inner walls of the tube which reduces the innerdiameter of the tube. Scale can be any color or texture;smooth or rough, granular or amorphous. Signs oferosion are generally pitting, cavitation, ridges and“islands” on the inner walls of the tubes. Since thiscondition results from extremely soft water sources, oras a result of a water softening program, the internalcopper surfaces will be extremely shiny. Otherchemicals, such as chlorine or chlorides in the water,will cause dark surfaces of erosion.

In areas where the water supply is extremelycorrosive, it is advisable to order the heater withcupro-nickel tubes in the exchanger.

Damage From Scaling, Corrosion, or Erosionis Not Covered by the Warranty.

SECTION 2.Installation

2A. Heater PlacementThe heater must be placed to provide specific

clearances on all sides for maintenance and inspection.There must also be minimum distances maintainedfrom combustible surfaces. These clearances alsoapply to non-combustible materials because the heaterrequires air circulation for proper operation.

Heater should be mounted on a level surface. Anintegral combustible flooring base is provided asstandard equipment on outdoor models. Indoor modelscan be installed on a combustible floor with a specialbase assembly which is available from the factory, orwith a base that complies with local coderequirements. See rating plate for part number of thebase assembly.

Do not install a heater on carpeting.Under the National Fuel Gas Code, ANSI

Z223.1, it is permissible to place the heater on floorsother than non-combustible when the installationcomplies with the American Insurance Code. Figures2, 3, 4 and 5 show common installation oncombustible flooring.

2B. Installation of Indoor Heaters1. Locate the water heater to provide adequate

clearance for inspection and service on all sides(see Table I). We recommend minimums of 24"from front (for proper access to and service ofcontrols) and 18" at water connection end. Foralcove installation (see Figure 6).

2. Install the heater on a waterproof floor with anadequate floor drain and a 6" minimum curb onall four sides to protect the building if heaterrepairs are required. The manufacturer will notbe held liable for any water damage inconnection with this heater.

Table 1. Minimum Boiler ClearancesFrom Combustible Surfaces.

Clearance Indoor OutdoorFrom (inches) (inches)

Top 30 unobstructWater Conn. Side 12 24Opposite Side 6 24Front Alcove UnobstructRear 8 24Vent Pipe* 6 —Hot Water Pipes Per Code Per Code

*1" when using type B Vent (refer to Manufacturer'sInstructions


Figure 2. Typical Heater Installation with Base forCombustible Floors, Example A.

Figure 3. Typical Heater Installation with Base forCombustible Floors, Example B.

Figure 4. Typical Heater Installation with Base forCombustible Floors, Example C.

Figure 5. Installation on Concrete Blocks or Tile.

* When the ceiling height exceeds 8 feet, you are only allowed toconsider 8 feet when calculating the total volume of the enclosure.

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WaterHeater

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CLOSET INSTALLATION(UNACCEPTABLE)

A closet is any 4 sided enclosurewhich is less than 16* times the totalvolume of all the gas fired applianceswithin the enclosure.

ROOM INSTALLATION(ACCEPTABLE)

A room is any enclosure which is atleast 16* times greater than the totalvolume of all the gas fired applianceswithin the enclosure.

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WaterHeater

ALCOVE INSTALLATION(ACCEPTABLE)

An alcove suitable for the installationof a water heater is a restricted sectionof a room not separated from theroom by a door or partition and whichmeets the minimum clearances forthe specific model water heater listedbelow.

Figure 6. Alcove Installation.


2B-1. Combustion Air Supply1. The heater location must provide sufficient air

supply for proper combustion and ventilation ofthe surrounding area as outlined in the latestedition of ANSI standard Z223.1, and any localcodes that may be applicable. Inadequatecombustion air supply may result in incompletecombustion, sooting of the heat exchanger, andunsafe operation of the heater.

2. In general, these requirements specify that smallheater rooms should be provided with twopermanent air supply openings communicatingdirectly through the wall to outside air; onewithin 12 inches of the ceiling, and the otherwithin 12 inches of the floor. Each openingshould have a minimum free area of one squareinch per 4,000 BTUH input of the total inputrating of all appliances in the enclosed area. SeeTable 2 for recommended air supply for eachmodel. An improperly ventilated equipmentroom can get excessively hot and causeaccelerated deterioration of controls andelectrical components.

IMPORTANT: In beauty shops, barber shops,cleaning establishments and self-service laundrieswith dry cleaning equipment, it is important that thewater heater be installed in a location where

combustion and ventilation air is received from asource outside the building. Please refer to the mostrecent edition of the National Fuel Gas Code, ANSIZ223.1, or in Canada, CGA requirements.

3. (a) In the United States: Exhaust Fans or Vents:Any equipment which exhausts air from theheater room can deplete the combustion airsupply or reverse the natural draft action of theventing system. This could cause flue products toaccumulate in the heater room. Additional airmust be supplied to compensate for such exhaust.The information in Table 2 is not applicable ininstallations where exhaust fans or blowers ofany type are used. Such installations must bedesigned by qualified engineers.(b) In Canada: Follow Canadian standard,CANI-B149or local codes.

4. If a blower or fan is used to supply air to theheater room, the installer should make sure itdoes not create drafts which could causenuisance shutdowns of the pilot. If a blower isnecessary to provide adequate combustion air tothe heater, a suitable switch or equivalent mustbe wired into the heater control circuit to preventthe heater from firing unless the blower isoperating.

5. The heater must be completely isolated andprotected from any source of corrosive chemicalfumes such as trichlorethylene, perchlorethylene,chlorine, etc.

2B-2. Venting1. Laars heaters have built-in draft diverters for

natural draft operation and must not beconnected to any portion of a mechanical draftsystem under positive pressure. The flue outletmust be connected to a clear, unobstructed ventof adequate capacity ending above the highestpoint of the building with an approved vent cap.The venting system should be installed accordingto the latest edition of ANSI Z223.1 and/or, inCanada, CAN1-B149 requirement and any localcodes having jurisdiction.

IMPORTANT NOTE: Do not use sheet metalscrews at the snap lock joints of Type B gas vents.

2. Do not weld or fasten the vent pipe to the heaterdraft hood. The weight of the stack must not reston the heater. The draft hood and heater top mustbe easily removable for normal heater serviceand inspection.

3. Avoid using long horizontal runs of the ventpipe, and too many 90° elbows, reductions orrestrictions. Horizontal runs should have at leasta 1/4" rise per foot in the direction of flow. Avent connector should be supported for thedesign and weight of the material used to

Table 2. Minimum RecommendedAir Supply to Boiler.

Heater Each Opening*Model (Square Inches)

500 125600 150715 179850 213

1010 2531200 3001430 3581670 4181825 457

*Net Free Area in Square Inches

Area indicated is for one of two openings; one atfloor level and one at the ceiling, so the total netfree area could be double the figures indicated.For special conditions refer to the latest edition ofANSI Z223.1.

Consult factory if not communicating directlythrough the walls with the outdoors.

Note: Check with louver manufacturers for netfree area of louvers. Correct for screenresistance to the net free area if a screen isinstalled. Check all local codes applicable tocombustion air.


maintain clearances and prevent physical damageand separation of joints.

4. Avoid ending heater vents near air conditioningor air supply fans. The fans can pick up exhaustflue products from the heater and return theminside the building, creating a possible healthhazard. A minimum of 4 feet horizontal distancemust be maintained from electrical meters, gasmeters, and relief equipment.

5. Always use double-wall or insulated vent pipe(Type B or equivalent). In cold weather,uninsulated outside vents can chill the rising flueproducts, blocking the natural draft action of theventing system. This can create a health hazardby spilling flue products into the heater room.

6. Avoid oversize vent piping or extremely longruns of the pipe which may cause excessivecooling and condensation. Rule of Thumb: Thetotal length of the vent, including the connectorand any offset, should not exceed 15 feet forevery inch of vent diameter. Longer total lengthsshown in venting tables are based on maximumcapacity, not condensation factors.

7. When the installation of a draft fan is necessaryin connecting a venting system to a Laars heater,the installation should be engineered bycompetent personnel following good engineeringpractices. The draft fan supplier should beconsulted for correct size. The installation shouldbe in accordance with the latest edition of ANSIZ223.1 and/or, in Canada, CAN1-B149requirement and any local codes havingjurisdiction. When a draft fan is installed, asuitable draft switch must be wired into theheater control circuit at terminal designated“Field Interlock” to prevent firing of the heaterunless a positive draft has been established.

2C. Installation of Outdoor Heaters1. Locate the heater to provide the minimum

clearances as listed in Table 1, “Placement ofHeater”.

2. Do not place the heater in an enclosure or wallrecess. Avoid locations where wind deflectionoff structures might cause down draft. Whensuch wind conditions are possible, place theheater at least three (3) feet from the structures.

3. Never install the heater under any kind of roofoverhang. Do not place the heater below oradjacent to any doors, windows, louvers, grills,etc. which connect in any way with an inhabitedarea of a building. This includes other structuressuch as garages or utility rooms (see Figure 7).

4. Although these models are AGA and CGAdesigned certified for outdoor installations, suchinstallations are not recommended in areas where

Figure 7. Incorrect Outdoor Installation.

the danger of freezing exists unless properprecautions are taken for freeze protection.

2D. Gas Supply and PipingReview the following instructions before

proceeding with the installation.

1. Verify that the heater is fitted for the proper typeof gas by checking the rating plate. Laars heatersare normally equipped to operate below a 2000foot altitude. Heaters equipped to operate athigher altitudes have appropriate stickers or tagsattached.

2. Use the figures in Table 3 to provide adequategas piping from the gas meter to the heater.

3. A trap (drip leg) must be provided ahead of thegas controls (see Figure 8 ). A manual gasshutoff valve must also be provided for serviceconvenience and safety. Check the local codes.

Table 3. Gas Piping Sizes.

Distance from Gas Meteror Last Stage Regulator

Size 0-100' 100-200' 200-300'

50060071585010101200143016701825

1-1/2"1-1/2"

2"2"2"

2-1/2"2-1/2"2-1/2"2-1/2"

2"2"2"

2-1/2"2-1/2"

3"3"3"3"

2"2-1/2"2-1/2"2-1/2"

3"3"3"3"

3-1/2"

Note: These figures are for Natural Gas (.65 Sp. Gr.), and arebased on 1/2" water column pressure drop. Check supplypressure with a manometer, and local code requirements forvariations. For LPG, reduce pipe diameter one size, but maintaina 1" minimum diameter. A normal number of Tees and elbowshave been taken into allowance.


4. The boiler and its individual shutoff valve must bedisconnected from the gas supply piping systemduring any pressure testing of that system at testpressures in excess of 1/2 psig. The boiler mustbe isolated from the gas supply piping system byclosing its individual manual gas shutoff valveduring any pressure testing of the gas supplypiping system at test pressures equal to or lessthan 1/2 psig.

5. Provide gas supply pressure to the heater asfollows:

Natural Gas LPG

Min. (inches water column)

Max. (inches water column)

Note: The heater and all other gas appliancessharing the heater gas supply line must be firing atmaximum capacity to properly measure the inletsupply pressure. Low gas pressure could be anindication of an undersized gas meter and/orobstructed gas supply line.

6. The correct burner manifold gas pressure isstamped on the rating plate. The regulator ispreset at the factory and normally requires nofurther adjustment.

7. The gas manifold and control assembly wastested and conform to the safe lighting and otherperformance criteria specified in the latesteditions of ANSI Z21.13 and CGA 3.3 LowPressure Boiler Standard.

8. Before operating the boiler, the complete gassupply system and all connections must be testedfor leaks using a soap solution. Do not use rawflame.

Figure 8. T-Fitting Sediment Trap Installation.

Per Rating Plate

9 14

CautionSince some leak test solutions (including soapand water) may cause corrosion or stresscracking, the piping must be rinsed with waterafter testing, unless it has been determinedthat the leak test solution is noncorrosive.

2E. Electrical Wiring

WARNINGThe heater must be electrically grounded inaccordance with the most recent edition of theNational Electrical Code, ANSI/NPA 70. InCanada, all electrical wiring to the heatershould be in accordance with the CanadianElectrical Code, CSA C22.1 Part 1. Do not relyon the gas or water piping to ground the metalparts of the heater. Oftentimes, plastic pipe ordielectric unions isolate the heater electrically.Service and maintenance personnel who workon or around the heater may be standing onwet floors and could be electrocuted by anunderground heater.

1. Check heater wiring and pump for correctvoltage, frequency and phase. If the pump circuitis other than 115V, check to see that the heater isprovided with an appropriate transformer.

2. Wire the heater and pump exactly as shown inthe wiring diagram supplied with the heater.

3. The pump and heater must be electricallyinterlocked so the heater cannot come on unlessthe pump is running.

4. All field installed electrical safety devices and allfield installed devices (draft switches, relays,timers, outdoor temperature reset devices, etc.)can be connected to the heater wiring at pointsshown in the wiring diagram designated “FieldInterlock”.

2F. Water Piping of System1. Be sure to provide valves at the inlet and outlet

of the boiler so it can be readily isolated forservice. A butterfly or similar type of valve isrecommended.

2. The pressure relief valve installed in the tappedopening provided in the outlet header (seeFigure 9), must be piped, but not fastened, to adrain or floor sink. The drain pipe must be thesame size as the valve outlet and must pitchdownward from the valve.


Special attention must be given to relief valvesettings in installations where the heater islocated on the ground floor of a tall building.The static pressure of the system is elevated andcould cause the relief valve to leak. Where nospecial setting of the relief valve is ordered, thefactory will furnish a 125 psi setting. Neverreduce the relief valve openings.

3. Pressure relief valve lever must be tripped atleast once a year to insure that waterways areclean. When manually operating lever, water willdischarge through drain line. Precautions must betaken to avoid contact with hot water and waterdamage.

4. The weight of all water and gas piping should besupported by suitable hangers or floor stands.

5. Check piping diagrams with local applicableplumbing, heating and building safety codes.

6. All two-temperature systems using temperaturevalves must have forced recirculation in the lowtemperature building loop.

7. A check valve installed at the hot water inlet tothe tempering valve will prevent cold water frombeing drawn in reverse through the temperingvalve into the hot water.

8. When installing a tempering valve, place atbottom of antithermosyphon loop at least 24"high to prevent excessive hot water fromentering mixed water supply. Bring the coldwater supply up from the floor to the valve (seeFigure 10).

2G. Water ExpansionWhen cold water is heated the water expands. If

no water is being used during the heat-up period theexpanded water will normally back up into the citymains.

A water pressure reducing valve installed in theincoming cold water line may act as a check valve andprevent the expanded water from moving backward.This will cause pressure to rise in the heater, whichwill be relieved by the pressure relief valve.

If the relief valve pops frequently a mineraldeposit may build up on the valve seat, causing it toleak.

The following suggestions may solve the problem:

1. Install a properly sized expansion tank.

2. Replace the installed water pressure reducing valvewith a suitable valve having a back flow port. Thesevalves have a back flow port which allows waterto flow backwards when the pressure in the systemexceeds the pressure in the mains.

3. Install a check valve around the pressure reducingvalve to permit reverse flow. This will allowthe expanded water to back flow into the mains.

4. Install an auxiliary small relief valve set at 25 psiless than the main relief valve. The valve must bepiped to a drain and may require occasionalcleaning. It will bleed off the expanded waterand protect the main pressure relief valve frombecoming fouled.

Figure 9. Pressure Relief Valve Location.

Figure 10. Tempering Valve Installation.


2H. Pump Performance and Installation1. The factory provided pump on PW heaters and

the recommended field provided pump formodel VW heaters are sized to provide propercirculation through the heater and heater-to-tank circulation loop (see Figures 11 and 12). Ifthe heater-to-tank circulating loop does notcontain more than 6 elbows or 30 feet ofpipe, use pipe fittings in the loop no smallerthan the following:

Model Pipe Size

500 through 850 2"1010 through 1825 2-1/2"

If the heater-to-tank circulating loop containsmore than 6 elbows or 30 feet of pipe, use pipeor fittings in the loop no smaller than thefollowing:

Model Pipe Size

500 through 850 2-1/2"1010 through 1825 3"

To assure free circulation, do not use globevalves, side outlet tee connections or otherrestrictive fittings in heater-to-tank loop.

2. The Model IW heater is designed for use in asystem without a hot water storage tank. The hotwater supply line to usage point must have areturn leg to the heater (see Figure 13, 14 and15). A built-in circulating pump and internal heatexchanger bypass maintains the heater in astandby condition. It also maintains thetemperature at the controller setting of the waterin the entire building circulating loop whether ornot there is any use of hot water.

A separate circulating pump is required forcirculation of water in the building loop. Thecontrol system provides variable heat inputs tomatch periods of higher or lower waterconsumption.

3. The Model IW heater requires a minimum ofcirculating hot water in the building circulationloop. To prevent excessive temperaturefluctuations in the delivered water, the wholebuilding system, including the return loop, musthave the equivalent volume of pipe shownbelow:

MinimumReservoir Equivalent Pipe

Model IW Gallons* Size and Length

500 through 850 ...............6.3 ................. 1 1/4" x 100 ft.1010 through 1220 .........10.2 ................. 1 1/2" x 100 ft.1430 through 1670 .........17.0 ....................... 2" x 100 ft.1825 ................................ 27.0 ................. 2 1/2" x 100 ft.

* The gallons shown are the calculated volumes of the pipes.

4. Model VW, PW and IW heaters are not suitablefor heating swimming pools or any otherapplication where temperature of the waterflowing through the heater remains below thedew point (110°F).

In applications requiring the rapid use ofmeasured volumes of water, the recovery of theheater between the time intervals of use mustequal the volume used. See the recovery table inthe current Document 2045 (Submittal Data).

5. Pump Sizing: A suitable pump must be field-provided for circulation of water between ModelVW heaters and the storage tank. This pumpmust be sized to avoid excessive temperature riseand to provide correct flow for water hardnessconditions. Specifications in Table 4 includeallowance for 30 feet of piping and normalfittings between heater and tank.

6. Install pump in a cool location. When pump isinstalled where it is subjected to excessive heat,the life of the pump will be shortened. Heat willembrittle motor insulation and dry out bearinglubricants. If the pump motor is equipped withthermal protection, excessive heat may trip thethermal switch and shut down the pumpintermittently. This could result in rapid scalingof the heater.

IMPORTANT: Check oil level in pump beforestarting. Oil pump every three (3) months. Fill bearingassembly to lower level of overflow vent. Add five (5)or six (6) drops of oil to front and rear of motor. Use20W non-detergent oil. Pumps located in excessivelyhot or dusty locations should be oiled once a month.Self lubricating pumps do not require oiling.

7. The pump should be accessible for lubrication,inspection and service.

8. If pump is designed for floor mounting, installsecurely on concrete block or pad at least six (6)inches above floor level. This will preventflooding of motor when floor is washed. Be surethat floor mounted pumps are not suspendedfrom piping and that piping is plumbed to avoidstrain on the pump casing.


Figure 11. Hot Water Supply System (Model VW & PW).

WithVertical

Tank

WithHorizontal

Tank

NOTES:Heavy line indicates Heater to Tank Circulating Loop.


CAUTION:1. This piping arrangement is required on split systems to provide constant hot water temperatures.2. Pipe size and length must conform to the recommendations for each heater model.3. A loop circulator is required to maintain forced circulation in the building hot water piping system.

Figure 13. Split System Piping Diagram, Model IW.

Figure 12. Hot Water Supply System Using Model PW with Dual Tanks, Building Loop Return and Circulating Pump.


Figure 15. Single Installation Piping Diagram, Model IW.

Figure 14. Dual Installation Piping Diagram, Model IW.

NOTES:1. All water connections 2" N.P.T. models.2. Drain valve per ASME requirements.3. A loop circulator is required to maintain forced circulation in the building hot water piping system.

NOTES:1. All water connections 2" N.P.T. models.2. Drain valve per ASME requirements.3. A loop circulator is required to maintain forced circulation in the building hot water piping system.


Figure 16. Two-Temperature Hot Water Supply System (Model VW or PW).

WithVertical

Tank

WithHorizontal

Tank

LegendB - Check Valve in Hot Water Supply

to Tempering ValveC - Check Valve in Return Line from

Building LoopD - Tempering ValveE - Venturi (Suction) TeeH - Throttling Valves in Building Loop

ReturnsI - Circulating Pump for 180° Building

LoopJ - Circulating Pump for 140° Building

LoopK - Service Valves to Isolate Heater

and Pump for Service

LegendB - Check Valve in Hot Water Supply

to Tempering ValveC - Check Valve in Return Line from

Building LoopD - Tempering ValveE - Venturi (Suction) TeeH - Throttling Valves in Building Loop

ReturnsI - Circulating Pump for 180° Building

LoopJ - Circulating Pump for 140° Building

LoopK - Service Valves to Isolate Heater

and Pump for Service


Figure 17. Two-Temperature Hot Water Supply System with Vertical Tank for Models VW and PW Water Heaters.

LegendB - Check ValveC - Check ValveD - Tempering ValveH - Throttling Valves in Building Loop ReturnsJ - Circulating Pump for Return LoopK - Service Valves to Isolate Heater and Pump

for Service


2I. Water PressureIt is very important that water pressure in the

system be maintained above 30 psi. If the systempressure should drop below this, the vapor pressure ofwater in the suction side of the pump can causehammer and cavitation in the pump and damage theheater through lack of water circulation. If for anyreason the water supply is turned off temporarily toservice a piece of equipment, the manual gas valveon the Model IW should be closed until the waterpressure has been restored and the lines bled ofaccumulated air. If the heater fails to fire when it isturned back on, it may be airlocked. To eliminate theairlock, open the pressure relief valve and allow air tobleed out until water flows. As soon as full circulationis resumed, the entrained air will be carried outthrough the hot water faucets.

2J. Tank Installation1. Be sure the floor is waterproof and structurally

capable of supporting the tank when it is filledwith water.

2. The tank should be placed so that manholes,inspection covers, nameplates and drain valvesare accessible.

3. Be sure the tank is suitable for the water in thesystem. Some water is corrosive and requires aprotected tank with a special lining.

4. If the tank is glass-lined, it should be equippedwith a suitable magnesium anode. It is goodpractice to replace the anode when it isapproximately 50% used. The factory warrantyon a glass-lined tank will be void if a satisfactoryanode is not in place at the time of a failure or ifit is consumed by cathodic action.

5. Make sure the tank connections in the heater-tank circulating loop are the proper size as listedin Section 2H. If tappings are smaller than therecommended pipe size, a larger pump may berequired. Consult the factory if in doubt.

6. Install a pipe in the tank drain fitting that goes toa floor sink, and install a drain valve. If a floorsink is not available, install a hose bib.

7. Hot water tanks in an existing installation arelikely to have a deposit of silt on the bottom.Therefore, it is important to extend the pumpsuction pipe in the tank to a position near the top.Pipe the return from the heater to the bottom ofthe tank.

2K. Two-Temperature SystemSee Figures 16 and 17 for piping schematics.

This system is designed to maintain the temperedwater circulating loop at the desired temperatureduring idle periods as well as when there is a demandfor hot water. It is recommended for general purposewater supply including shower and bathingapplications. Water at 180°F is available directly fromthe tank.

SECTION 3.Operation

3A. Controls - General1. Electronic Ignition Controls:

a. Intermittent Ignition:

Pilots are automatically lit when theoperating aquastat calls for heat (System #9and #4)

The unit performs its own safety check andopens the main valves only after the pilot is

Flow Head* Temp. Rise Water Rate Loss Across

Model Category (GPM) (ft.) Heater, (°F)

Soft 45 5.0 17500 Normal 68 9.9 11

Hard 90 15.7 8

Soft 45 5.1 20600 Normal 68 10.0 14

Hard 90 15.9 10

Soft 45 5.3 24715 Normal 68 11.0 16

Hard 90 17.8 12

Soft 45 5.4 30850 Normal 68 11.1 20

Hard 90 18.1 15

Soft 45 3.9 351010 Normal 68 7.5 23

Hard 90 11.7 18

Soft** 68 7.8 271200 Normal 68 7.8 27

Hard 90 12.2 21

Soft** 68 8.1 321430 Normal 68 8.1 32

Hard 90 12.6 24

Soft** 68 8.3 371670 Normal 68 8.3 37

Hard 90 13.0 28

Soft** 90 13.5 301825 Normal** 90 13.5 30

Hard 90 13.5 30

Water Category Grain Hardness per Gal. Soft 1 through 7.5 Normal 7.6 through 17 Hard Over 17

* Pressure drop includes loss through 30 feet of pipe and normal fittings whenheater is installed with storage tank. Pipe and fittings are assumed to be 2" onModels (500-850) and 2 1/2" on Models (1010-1825)

** To prevent erosion, these models must be ordered with cupro-nickel heatexchanger tubes.

Table 4. Pump Performance Requirements.


proven to be lit. Whenever the pilot flame isinterrupted, the main gas valve closes within0.8 seconds.

b. Electronically Supervised Standing PilotSystem (System #16):

When pilot flame fails, the ignition controlmodule responds in less than 0.8 secondsand provides 100% safety shutdown.

2. Operating Controls:

a. Electrically Operating Controls:

Single, two-stage, four-stage or modulatingaquastats are provided in models VW, PWand IW heaters to control the desiredservice water temperature. The temperaturesensing bulb is located in the heater inlet.

b. Modu-snap Valves:

These valves are furnished in addition tothe main electric gas valve when heater isordered with mechanical modulation. Eachvalve has a remote capillary bulb immersedin a well at the outlet header to maintain aconstant outlet temperature. Consult Table5 for desired temperature setting.

3. High Limit Controls:

The manual reset high limit switches areprovided as standard equipment on all heaters.Automatic reset switches are optionally

provided. The temperature sensing bulb of theswitch is always located in the heater outlet.Burners will automatically shut down wheneveroverheating of water occurs.

4. Flow Switch:Standard on all models: Models VW and PW, theswitch is mounted in the outlet “tee” connection.Model IW, the switch is mounted directly in theheader outlet. The flow switch shuts down allburners in case of low water condition or pumpfailure.

5. Low Water Cut Off:The low water cut off automatically shuts offheater whenever water level drops below probe.Located at heater inlet (model IW and PW) andat return header (model VW).

3B. Initial Start-UpBefore placing the heater in operation, be certain

that the heater is filled with water and all air is purgedfrom the system. Once the heater is connected to the

Figure 18. Single Installation Piping Diagram, Model IW.

Dial No. 1 2 3 4 5 6 7 8 9+

Temp °F 120 128 135 143 150 158 165 173 180+

Table 5. Modu-Snap Temperature Settings.


gas supply, the automatic safety shutoff devices mustbe checked.1. Before beginning the tests, make sure the main

manual gas valve, and any other heater firingvalves are in the “OFF” position.

2. Make sure the heater’s power switch is in the“ON” position. After placing the manual pilotgas valve in the open position and resetting allsafety devices, (high limit, pressure switch, low-water cutoff, etc.) pilot(s) can be lit following theprocedure located on the heater rating plate.

3. Once the pilot(s) is lit and has been establishedfor five minutes, the flame failure response timeshould be checked as follows:Systems 9 and 4 - (Intermittent ignition): With

this system pilots are automatically lit when theoperating controls call for heat. If the pilot flame failsfor any reason, the main valve is shut off within onesecond and the pilot spark ignition is initiated until thepilot flame has been reestablished. On propanesystems, unit locks out for safety. This sequenceshould be checked by turning off the manual pilot gasvalve, and, at the same time, monitoring the audiblesparking at the pilot burner and signal interruption tothe main valve.

CautionPropane gas is heavier than air and sinks tothe ground. Exercise extreme care in lightingthe heater when so equipped.

System 16 - (Electronically supervised standingpilot system): Extinguish the pilot flame by placingthe manual pilot valve in the closed position, and atthe same time, begin recording the time it takes for theoutput signal from the electronic ignition control to beinterrupted. The signal interruption can be detectedeither with a test light or a voltmeter. The responsetime should never exceed one second.

4. With the pilots lit, initial activation of the mainburners can be achieved by slowly opening themain manual valve. The result should be asmooth lighting of the main burners.

Hi-Limit Checkout:After running the heater for a long enough

period, bring the water temperature within the range ofthe hi-limit and slowly back off the high limit settinguntil the heater shuts off. The main burners shouldreignite when the hi-limit is reset and turned back upto its original setting. The heater should now run untilit shuts off automatically on operating aquastat.

3C. To Start Up System:1. Start Up BoilerBe certain system pump is running, then proceed

as follows:

a. Turn off main electrical switch.b. Turn off all manual gas valves and wait five

minutes (see Figure 19).c. Set operating control to lowest setting.d. Slowly turn manual gas valve to “ON”.e. Reset all safety valve switches (manual reset

high limit and low water cut off).f. Open manual pilot valve. Turn on main electrical

switch.g. Set temperature controller to desired

temperature. Pilot will light automatically toignite main burners whenever the aquastat callsfor heat.For standing pilot system, press on pilot relay

knob, see Figure 20, light pilot and keep relay knob

Figure 19. Gas Manual Valves.

Figure 20. Pilot Safety Relay.


depressed for one minute then release. Once the pilotis lit, the power is supplied through the aquastat to themain gas valve.

2. To set the temperature and high-limit controls:When using a tank aquastat:Set the tank aquastat to the desired tank

temperature. Set the heater temperature control 20°Fhigher than tank aquastat. Set the manual reset highlimit 50°F higher than tank aquastat. Example: Ifdesired temperature is 140°F, set the tank aquastat at140°F, set the heater temperature control at 160°F, andset the manual reset high limit at 190°F. If the heateris equipped with a pump time delay, the three-positionswitch on the side of the heater can be put into the“Auto Pump” pposition, so that the pump will onlyrun when the tank aquastat calls for heat. then, whenthe call for heat is satisfied, the heater will turn off,but the pump will run for the set amount of delay time(adjustable between 0.1 and 10 minutes).

When a tank aquastat is not used:The pump on the heater must run continuously,

so the heater's temperature control will sense the tank'swater temperature. Set the heater temperature controlto the desired tank temperature. Set the manual resethigh limit 50°F higher than the heater temperaturecontrol. Example: If desired temperature is 140°F, setthe heater temperature control at 140°F, and set themanual reset high limit at 190°F.

3D. To Turn Off Heater:1. Turn off main electric switch.2. Close all manual gas valves.

3E. To Shut Down System:To shut down heater, turn off all manual gas

valves and electrical disconnect switches. Wheneverdanger of freezing exists, shut off water supply andremove drain plug in the bottom of front header cover.Drain every part of system subject to freezingtemperature.

SECTION 4.Maintenance1. Lubricate the water circulating pump (see

instructions found on the pump).

2. If a strainer is employed in a pressure reducingvalve or in piping, clean it every six (6) months.

3. At start-up and every six (6) months thereafter,the pilot and main burner flame should beobserved for proper performance (see Figure 21).See attached lighting and shut-down instructionsfor proper pilot flame pattern). If flame has the

appearance of “sooting” tips, check for debrisnear orifices. Call serviceman.

4. Inspect the venting system for obstruction,leakage and corrosion at least once each year.

5. Keep heater area clear and free from combustiblematerial, gasoline and other flammable vaporsand liquids (see Table 1 for minimumclearances).

6. Be certain all combustion air and ventilationopenings are unobstructed.

7. Check for fouling on the external surfaces of theheat exchanger every six months. (NOTE: Afterinstallation and first start-up, check the heatexchanger for fouling after the following periodsof operation: 24 hours, 7 days, 30 days, 90 days,and once every six months thereafter).

Fouling on the external surfaces of the heatexchanger is caused by incomplete combustionand is a sign of combustion air and/or ventingproblems. As soon as any fouling is observed,the cause of the fouling should be corrected (seeSection 5, Troubleshooting Guide). The heatexchanger can be checked by locating a mirrorunder the burners with a flashlight. An alternatemethod is to remove the venting and top panel asnecessary to inspect from above. Also check thevent system for defects at this time.a. If cleaning is required, shut off all electrical

and gas supply to the heater.b. To expose the heat exchanger:Indoor Models:Remove flue pipe, top of unit, rear upper jacket,flue collector rear panel and heat exchangerbaffles.Outdoor Models:Remove vent top assembly, rear upper jacket,flue collector rear panel and heat exchangerbaffles.c. Remove all burners:It is usually more convenient to remove theburner tray assembly. Disconnect sensor wire,ignition cable (or thermocouple generator) andpilot gas line. Disconnect manifold inletunion(s). Remove the four (4) retaining screws.Grasp burner/pilot assembly firmly at the front.Push it back, disengaging it from the gas orifice.

Figure 21. Main Burner Flame Pattern.


Lower the front of the burner (to avoid damagingpilot shield) then remove the burner tray.

CautionBlack carbon or green soot on a dirty heatexchanger can, under certain conditions, beignited by a random spark or open flame. Toprevent this unlikely occurrence, dampen thesoot deposits with wet brush or fine waterspray before servicing or cleaning the heatexchanger.

With a wire brush, remove soot and loose scalefrom heat exchanger. Clean fallen debris frombottom of heater. Make sure burner ports areclear and pilot assembly is free of debris.d. Reassemble in reverse order:Be sure the heat exchanger baffles are replaced.

8. The gas and electric controls installed on heatersare engineered for both dependable operationand long life, but the safety of this equipmentcompletely depends on their proper functioning.It is strongly recommended that the basic itemsbe checked by a competent serviceman everyyear and replaced when necessary. The basiccontrols are:a. Water temperature controls.b. Pilot safety system.c. Automatic electric gas valve(s).d. Flow sensing safety device.

9. Low water cutoffs should be inspected every six(6) months, including flushing of float types.

NOTE: Warranty does not cover any damagecaused by lack of required maintenance or improperoperating practices.10. Both modulating and stage valve are adjusted at

the factory for minimum permissible rates andshould not be readjusted.

SECTION 5.Troubleshooting and Analysis ofService Problems1. For proper service and problem diagnosis of the

heater and heater system, the following tools arerequired:a. Gas pressure test kit with range from zero

to 14 W.C. Either a slack tub manometer oran accurate gas pressure gauge isacceptable with proper adapters which willconnect to the available fittings in the lineand on the gas valve.

b. Multi-meter with the following ranges:0 to 500 volts A.C.0 to 1000 ohms continuity.

c. Tube cleaning kit consisting of reamer,stainless steel brush, speed handle andhandle extensions.

d. Heater thermometer (with 1/2" NPT well)100-240°F.

2. In addition, the heater should be equipped with asystem pressure gauge with proper ranges forheater operation.

I. HEATER WILL NOT FIRE.

Possible Cause What To Do

A. Electric power is off A. Check to see that main powerswitch is “ON.” Use testingdevice to trace power toheater junction box.

B. Operating or safety control B. Turn off power. Use continuityhas opened circuit to electric across terminals of eachgas valve. operating and safety control

switch up to the electric gasvalve. Replace effectivecontrol.

C. Pilot flame is out. C.Relight pilot per instruction.

D. Manual reset device has D.Follow instructions for start-tripped. up. Reset Pilot safety and all

manual reset safety switchesand reset manual safety gasvalve.

E. No gas pressure to burners. E. Trace gas line to serviceshutoff cock. If service cock isopen, trace gas line to meter.If no pressure is present atmeter, call for public utilityservice. If gas is present inheater inlet, check pressuresin following sequence:(1) downstream from pressureregulator. (2) downstreamfrom electric gas valve.Replace or adjust asnecessary.

F. Electric gas valve operator is F. Disconnect wiring harness atburned out or shortened. gas valve terminals. Check

continuity to actuator coil. Ifopen circuit or short isindicated, replace coil oroperator.


II. HEATER IS POUNDING, KNOCKING OREMITTING STEAM FROM RELIEF VALVES.


A. Low or no water flow. A. This condition is usuallycaused by lack of adequatewater flow through heater.Check the following:1. Is the heater wired into thepump circuit so that the heatercannot fire unless the pump isrunning?2. Check to see that all valvesin system are open to be surethat water can circulatethrough the heater and thesystem.3. If the system has automaticwater valves (2-way or 3-way)that can cut off the water flowthrough the heater check tosee that they are equipped withend-switches which shut theheater down when the waterflow through the heater isreduced by 70% from full flow.4. Examine pump for cloggedimpeller.

B. Low or no system pressure. B. Clean strainer in pressurereducing valve. Look for closedvalve water line or a leak in thesystem.

C. Clogged “Y” strainer. C. Remove strainer element andclean screen.

D. Debris from system piping D. Remove header covers.is blocking tubes. Examine all tubes and

waterways. Use new gasketswhen reassembling. Cleanout tubes.

E. Scale has formed in tubes. E. This is always caused by theinflow of raw water into thesystem. Clean tubes with tubecleaning kit. Determinehardness. Check water flow,replace pump for modifiedflow if necessary.

IV. PRESSURE RELIEF VALVES LEAKINGINTERMITTENTLY OR STEADILY.


A.Static pressure in system A. Calculate height of water inexceeds setting of relief valve. system above heater. Install

new valve with psi setting 25%above required static systemworking pressure. Do notexceed 160 psi.

B. Expansion tank is water- B. Drain expansion tank, thenlogged (if installed). reopen it to the system. Look

for leaks in expansion tank orfittings. Calculate requiredvolume of expansion tank inrelation to system to determineif tank is adequate.

V. SOOT IN FLUEWAYS OR IN TUBES, ORNOXIOUS FUMES INDICATIVE OF BADCOMBUSTION.


A. Combustion air supply to A. Check air supply opening.heater room is inadequate. Look for debris in screen or

louvre which coverscombustion air opening, or formaterial blocking the opening.

B. Stack or vent is blocked or B. Look for blocked stack andrestrictive. excessive number of elbows in

stack or excessive length ofhorizontal runs.

C.Severe down draft is causing C.Check for (1) proper vent capspillage of flue products into on stack; (2) adequate heightroom. of stack above roof;

(3) equipment exhausting airfrom inside of building; and(4) proper installation of draftdiverter.

D.Gas pressure to burners is D.Check gas pressure withexcessive. nanometer, and adjust with

heater firing at full rate.

E. Heater not fitted for the fuel E. See nameplate for correct fuel.supplied.

F. Heater installed at high F. Installations at altitudes inaltitude without proper excess of 2000 ft. above seaderating. level are subject to jurisdiction

of the local inspectionauthorities.

III. WATER DRIPPINGIN FIREBOX.


Tube in heat exchanger has A tube failure is almost alwaysoverheated and ruptured. caused by (a) scale formation

in the tube or (b) inadequatewater flow through the boiler.


Key

Des

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Mo

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Mo

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50

06

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71

58

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1010

1200

1430

1670

1825

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Ass

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05

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05

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05

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61

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71

05

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81

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10

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SECTION 6. Parts Descriptions and Order Numbers


Figure 22. Parts Identification.

NOTE:Temperature Control Wells -Inlet/Outlet Header1. Firing Mode L, K, & C -

2 Dry Wells2. Firing Mode H

A. Natural Gas Boilers & Heaters500 thru 850 - 2 Dry Wells1010 thru 1430 - 3 Dry Wells1670 thru 1825 - 4 Dry Wells

B. Propane Gas Boilers & Heaters500 thru 850 - 2 Dry Wells1010 thru 1852 - 3 Dry Wells


Key

Des

crip

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Mo

del

Mo

del

Mo

del

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del

Mo

del

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del

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1430

1670

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r, F

ront

——

——

——

——

——

1054

8101

1054

8102

1054

8103

1054

8104

25Ti

le,

Hea

t S

hiel

d/S

pace

r, R

ear

——

1054

8201

1054

8202

——

——

1054

8203

1054

8201

1054

8204

1054

8203

26Ti

le,

Hea

t S

hiel

d/S

pace

r, R

ear

——

——

——

1054

8302

1054

8303

——

——

——

1054

8301

27Ti

le,

Hea

t S

hiel

d/S

pace

r, R

ear

——

——

——

——

——

1054

8401

1054

8402

1054

8403

1054

8404

28S

addl

e A

ssem

bly,

End

Tile

1053

3600

1053

3600

1053

3600

1053

3600

1053

3600

1053

3600

1053

3600

1053

3600

1053

3600

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

29Lo

wer

End

Pan

el/H

eat S

hiel

dW

eldm

ent,

Rig

ht10

5407

0110

5407

0110

5407

0110

5407

0110

5407

0110

5407

0110

5407

0110

5407

0110

5407

01

30Lo

wer

End

Pan

el/H

eat

Shi

eld

Wel

dmen

t, Le

ft10

5407

0210

5407

0210

5407

0210

5407

0210

5407

0210

5407

0210

5407

0210

5407

0210

5407

02

31Lo

wer

Rea

r P

anel

& B

affle

Rea

r W

eldm

ent

1053

2901

1053

2902

1053

2903

1053

2904

1053

2905

1053

2906

1053

2907

1053

2908

1053

2909

32M

iddl

e R

ear

Pan

el/H

eat

Shi

eld

Wel

dmen

t10

5404

0110

5404

0210

5404

0310

5404

0410

5404

0510

5404

0610

5404

0710

5404

0810

5404

09

33E

nd P

anel

, Upp

er R

ight

1053

1600

1053

1600

1053

1600

1053

1600

1053

1600

1053

1600

1053

1600

1053

1600

1053

1600

34E

nd P

anel

, Upp

er L

eft

1053

4000

1053

4000

1053

4000

1053

4000

1053

4000

1053

4000

1053

4000

1053

4000

1053

4000

35U

pper

Rea

r P

anel

/Hea

tS

hiel

d W

eldm

ent

1054

0501

1054

0502

1054

0503

1054

0504

1054

0505

1054

0506

1054

0507

1054

0508

1054

0509

36F

ront

Pan

el, U

pper

1053

1501

1053

1502

1053

1503

1053

1504

1053

1505

1053

1506

1053

1507

1053

1508

1053

1809

37B

rack

ets,

Sup

port

, End

Tile

1055

1000

1055

1000

1055

1000

1055

1000

1055

1000

1055

1000

1055

1000

1055

1000

1055

1000

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

38D

rafth

ood,

Rel

ief B

affle

, Rig

ht10

5409

0110

5409

0210

5409

0310

5409

0410

5409

0510

5409

0610

5409

0710

5409

0810

5409

09

39D

rafth

ood,

Rel

ief B

affle

, Lef

t10

5410

0110

5410

0210

5410

0310

5410

0410

5410

0510

5410

0610

5410

0710

5410

0810

5410

09

40Lo

wer

Rig

ht P

anel

/Hea

tS

hiel

d W

eldm

ent

1055

4601

1055

4602

1055

4603

1055

4604

1055

4605

1055

4606

1055

4607

1055

4608

1055

4609

41M

iddl

e F

ront

Pan

el10

5544

0110

5544

0210

5544

0310

5544

0410

5544

0510

5544

0610

5544

0710

5544

0810

5544

09

42S

wee

p S

heet

, Flu

e C

olle

ctor

1053

3901

1053

3902

1053

3903

1053

3904

1053

3905

1053

3906

1053

3907

1053

3908

1053

3909

NO

TE

: Num

bers

in (

) re

pres

ent q

uant

ity r

equi

red

for

each

siz

e. Q

uant

ity is

one

oth

erw

ise.


Figure 23. Tile Assemblies.

LAARS HEATING SYSTEMSPage 26K

eyD

escr

iptio

nM

od

elM

od

elM

od

elM

od

elM

od

elM

od

elM

od

elM

od

elM

od

elN

o5

00

60

07

15

85

010

1012

0014

3016

7018

25

43

Igni

tion

Con

trol

, E

lect

roni

cE

01

00

90

0E

01

00

90

0E

01

00

90

0E

01

00

90

0E

01

00

90

0E

01

00

90

0E

01

00

90

0E

01

00

90

0E

01

00

90

0

44

Tran

sfor

mer

, 11

5V

/24V

E0

08

61

00

E0

08

61

00

E0

08

61

00

E0

08

61

00

E0

08

61

00

E0

08

61

00

E0

08

61

00

E0

08

61

00

E0

08

61

00

45

Con

trol

Box

Wel

dmen

t1

05

45

80

01

05

45

80

01

05

45

80

01

05

45

80

01

05

45

80

01

05

45

80

01

05

45

80

01

05

45

80

01

05

45

80

0

46

Con

trol

Box

Cov

er1

05

47

20

01

05

47

20

01

05

47

20

01

05

47

20

01

05

47

20

01

05

47

20

01

05

47

20

01

05

47

20

01

05

47

20

0

47

Win

g N

ut,

#8-3

2F

00

32

10

0F

00

32

10

0F

00

32

10

0F

00

32

10

0F

00

32

10

0F

00

32

10

0F

00

32

10

0F

00

32

10

0F

00

32

10

0(2

)(2

)(2

)(2

)(2

)(2

)(2

)(2

)(2

)

48

Bas

e Ti

le S

uppo

rt A

ssy.

10

53

69

01

10

53

69

02

10

53

69

03

10

53

69

04

10

53

69

05

10

53

69

06

10

53

69

07

10

53

69

08

10

53

69

09

49

Bur

ner,

Mai

nL

00

52

30

0L

00

52

30

0L

00

52

30

0L

00

52

30

0L

00

52

30

0L

00

52

30

0L

00

52

30

0L

00

52

30

0L

00

52

30

0

50

Pilo

t B

rkt/B

urne

r W

eldm

ent

(Joh

nson

Pilo

t)10

5295

0110

5295

0110

5295

0110

5295

0110

5295

0110

5295

0110

5295

0110

5295

0110

5295

01(H

oney

wel

l Pilo

t)10

5295

0210

5295

0210

5295

0210

5295

0210

5295

0210

5295

0210

5295

0210

5295

0210

5295

02

51P

ilot B

urne

r (J

ohns

on)

Sta

ndin

g P

ilot,

Nat

W00

3470

0W

0034

700

W00

3470

0W

0034

700

W00

3470

0W

0034

700

W00

3470

0W

0034

700

W00

3470

0P

ilot B

urne

r (H

oney

wel

l)S

tand

ing

Pilo

t, N

atW

0035

800

W00

3580

0W

0035

800

W00

3580

0W

0035

800

W00

3580

0W

0035

800

W00

3580

0W

0035

800

52P

ilot B

urne

r (J

ohns

on)

Sta

ndin

g P

ilot,

Pro

pane

W00

3460

0W

0034

600

W00

3460

0W

0034

600

W00

3460

0W

0034

600

W00

3460

0W

0034

600

W00

3460

0P

ilot B

urne

r (H

oney

wel

l)S

tand

ing

Pilo

t, P

ropa

neW

0034

400

W00

3440

0W

0034

400

W00

3440

0W

0034

400

W00

3440

0W

0034

400

W00

3440

0W

0034

400

53P

ilot B

urne

r (J

ohns

on)

IID P

ilot,

Nat

W00

3450

0W

0034

500

W00

3450

0W

0034

500

W00

3450

0W

0034

500

W00

3450

0W

0034

500

W00

3450

0P

ilot B

urne

r (H

oney

wel

l)IID

Pilo

t, N

atW

0034

300

W00

3430

0W

0034

300

W00

3430

0W

0034

300

W00

3430

0W

0034

300

W00

3430

0W

0034

300

54G

as M

anifo

ld W

eldm

ent (

sing

le)

1052

5901

1052

5902

1052

5903

1052

5904

1052

5905

1052

5906

1052

5907

1052

5908

1052

5909

55O

rific

e, N

at, G

asL0

0507

00L0

0507

00L0

0507

00L0

0507

00L0

0507

00L0

0507

00L0

0507

00L0

0507

00L0

0507

00(2

2)(2

6)(3

0)(3

6)(4

2)(5

0)(6

0)(7

0)(7

6)

56O

rific

e, P

ropa

ne -

9"

W.C

.L0

0329

00L0

0329

00L0

0329

00L0

0329

00L0

0329

00L0

0329

00L0

0329

00L0

0329

00L0

0329

00(2

2)(2

6)(3

0)(3

6)(4

2)(5

0)(6

0)(7

0)(7

6)

57M

anifo

ld C

over

Pla

t Ass

y.10

5529

0110

5529

0210

5529

0310

5529

0410

5529

0510

5529

0610

5529

0710

5529

0810

5529

09

58B

urne

r, A

nti R

otat

ion

Brk

t (le

ft)10

5253

0110

5253

0210

5253

0310

5253

0410

5253

0510

5253

0610

5253

0710

5253

0810

5253

09

59B

urne

r, A

nti R

otat

ion

Brk

t (rig

ht)

1054

2701

1054

2702

1054

2703

1054

2704

1054

2705

1054

2706

1054

2707

1054

2708

1054

2709

60B

urne

r Ti

e D

own

Bra

cket

(le

ft)10

5257

0110

5257

0210

5257

0310

5257

0410

5257

0510

5257

0210

5257

0310

5257

0410

5257

04(2

)(2

)(2

)10

5257

05

61B

urne

r T

ie D

own

Bra

cket

(rig

ht)

1054

2001

1054

2002

1054

2003

1054

2004

1054

2005

1054

2002

1054

2003

1052

5704

1052

5704

62V

alve

, Man

ual,

Gas

, Nat

ural

V00

0420

0V

0004

200

V00

0420

0V

0004

200

V00

0430

0V

0004

300

V00

0430

0V

0004

300

V00

0430

0

63V

alve

, Man

ual,

Gas

, Pro

pane

V00

0480

0V

0004

800

V00

0480

0V

0004

800

V00

0420

0V

0004

200

V00

0430

0V

0004

300

V00

0430

0

NO

TE

: Num

bers

in (

) re

pres

ent q

uant

ity r

equi

red

for

each

siz

e. Q

uant

ity is

one

oth

erw

ise.


Key

Des

crip

tion

Mo

del

Mo

del

Mo

del

Mo

del

Mo

del

Mo

del

Mo

del

Mo

del

Mo

del

No

50

06

00

71

58

50

1010

1200

1430

1670

1825

64

Saf

ety

Gas

Val

ve, O

n-O

ff,Tw

o S

tage

(N

at)

V00

4660

0V

0046

600

V00

4600

V00

4600

V00

4670

0V

0046

700

V00

4670

0V

0046

700

V00

4680

0

65S

afet

y G

as V

alve

, On-

Off,

Two

Sta

ge (

Pro

)V

0046

600

V00

4660

0V

0046

600

V00

4660

0V

0046

600

V00

4660

0V

0046

700

V00

4670

0V

0046

700

66V

alve

, Gas

, Ope

ratin

g / R

eg.

On-

Off,

Tw

o S

tage

(N

at)

V00

5120

0V

0051

200

V00

5120

0V

0051

200

V00

5130

0V

0051

300

V00

5130

0V

0051

400

V00

5140

0

67V

alve

, Gas

, Ope

ratin

g / O

n-O

ffTw

o S

tage

(P

ro)

V00

5480

0V

0054

800

V00

5480

0V

0054

800

V00

5480

0V

0054

800

V00

5490

0V

0054

900

V00

5490

0

68V

alve

, Pilo

t, G

as, M

anua

lW

0002

100

W00

0210

0W

0002

100

W00

0210

0W

0002

100

W00

0210

0W

0002

100

W00

0210

0W

0002

100

69Tu

be A

ssem

bly,

Cop

per

1053

4701

1053

4702

1053

4703

1053

4704

1053

4705

1053

4706

1053

4707

1053

4708

1053

4709

70Tu

be A

ssem

bly,

Cup

ro-n

icke

l10

5537

0110

5537

0210

5537

0310

5537

0410

5537

0510

5537

0610

5537

0710

5537

0810

5537

09

71S

crew

, Cap

, 1/2

" -

13 x

4 1

/2"

F00

2870

0F

0028

700

F00

2870

0F

0028

700

F00

2870

0F

0028

700

F00

2870

0F

0028

700

F00

2870

0

72S

crew

, Cap

, 1/2

" -

13 x

2 1

/4"

F00

2310

0F

0023

100

F00

2310

0F

0023

100

F00

2310

0F

0023

100

F00

2310

0F

0023

100

F00

2310

0

73S

crew

, Cap

, 1/2

" -

13 x

1 1

/2"

F00

1330

0F

0013

300

F00

1330

0F

0013

300

F00

1330

0F

0013

300

F00

1330

0F

0013

300

F00

1330

0

74W

ashe

rF

0011

400

F00

1140

0F

0011

400

F00

1140

0F

0011

400

F00

1140

0F

0011

400

F00

1140

0F

0011

400

75P

lug,

Sq.

Hd.

, 1 “

NP

TP

0033

000

P00

3300

0P

0033

000

P00

3300

0P

0033

000

P00

3300

0P

0033

000

P00

3300

0P

0033

000

76P

lug,

1/2

" N

PT

P00

2690

0P

0026

900

P00

2690

0P

0026

900

P00

2690

0P

0026

900

P00

2690

0P

0026

900

P00

2690

0

77N

ippl

e, B

rass

, 3/4

" x

2"P

0025

300

P00

2530

0P

0025

300

P00

2530

0P

0025

300

P00

2530

0P

0025

300

P00

2530

0P

0025

300

78Va

lve,

Pre

ss, R

elie

f 3/4

" -7

5 P

SI

A00

6360

0A

0063

600

A00

6360

0A

0063

600

A00

6360

0A

0063

600

A00

6360

0A

0063

600

A00

6360

0

79Te

mp/

Pre

ss G

auge

A00

7900

0A

0079

000

A00

7900

0A

0079

000

A00

7900

0A

0079

000

A00

7900

0A

0079

000

A00

7900

0

80F

low

Sw

itch

(indo

or)

E00

1310

0E

0013

100

E00

1310

0E

0013

100

E00

1310

0E

0013

100

E00

1310

0E

0013

100

E00

1310

0(o

utdo

or)

E00

1300

0E

0013

000

E00

1300

0E

0013

000

E00

1300

0E

0013

000

E00

1300

0E

0013

000

E00

1300

0

81N

ippl

e, 2

" x

cl. -

GaI

vP

0038

500

P00

3850

0P

0038

500

P00

3850

0—

——

——

——

——

——

——

——

——

——

—

82N

ippl

e, 2

1/2

" x

3" G

aIv

——

——

——

——

——

——

——

——

P00

2200

0P

0022

000

P00

2200

0P

0022

000

P00

2200

83R

ed. T

ee, 2

x 2

x 1

, GaI

vP

0028

500

P00

2850

0P

0028

500

P00

2850

0—

——

——

——

——

——

——

——

——

——

—R

ed. T

ee, 2

1/2

x 2

1/2

x 1

, GaI

v—

——

——

——

——

——

——

——

—P

0055

900

P00

5590

0P

0055

900

P00

5590

0P

0055

900

84P

ump

Rot

atin

g A

ssem

bly

See

Cur

rent

Doc

umen

t 204

0 F

or P

ump

Req

uire

men

ts

85P

ump

Hou

sing

1026

1501

1026

1501

1026

1501

1026

1501

1026

1501

1026

1501

1026

1501

1026

1501

1026

1501

86G

aske

t, P

ump

Hou

sing

S00

2460

0S

0024

600

S00

2460

0S

0024

600

S00

2460

0S

0024

600

S00

2460

0S

0024

600

S00

2460

0

87P

ump

Ada

pter

1036

4200

1036

4200

1036

4200

1036

4200

1036

4200

1036

4200

1036

4200

1036

4200

1036

4200

88S

crew

, Hex

Hd.

1/2

- 1

3 x

1 3/

4F

0009

200

F00

0920

0F

0009

200

F00

0920

0F

0009

200

F00

0920

0F

0009

200

F00

0920

0F

0009

20

NO

TE

: Num

bers

in (

) re

pres

ent q

uant

ity r

equi

red

for

each

siz

e. Q

uant

ity is

one

oth

erw

ise.


eyD

escr

iptio

nM

od

elM

od

elM

od

elM

od

elM

od

elM

od

elM

od

elM

od

elM

od

elN

o5

00

60

07

15

85

010

1012

0014

3016

7018

25

89

Plu

g, 3

/4, S

q. H

d.P

00

27

00

0P

00

27

00

0P

00

27

00

0P

00

27

00

0P

00

27

00

0P

00

27

00

0P

00

27

00

0P

00

27

00

0P

00

27

00

0

90

Pip

e E

xten

sion

1/2

" F

emal

eP

ipe

Ext

ensi

on 1

/2"

Mal

eP

0072

300

P00

7230

0P

0072

300

P00

7230

0P

0072

300

P00

7230

0P

0072

300

P00

7230

0P

0072

300

91B

affle

, Diff

user

1033

8400

1033

8400

1033

8400

1033

8400

1033

8400

1033

8400

1033

8400

1033

8400

1033

8400

92B

urne

r Tra

y, II

D, 2

Sta

ge, S

GL

Sec

t. M

anifo

ld (

Nat

)10

5506

0110

5506

0210

5506

0310

5506

0410

5506

0510

5506

0610

5506

0710

5506

0810

5506

09

93B

urne

r Tr

ay,

St.

Pilo

t, 2

Sta

ge,

SG

L, S

ect.

Man

ifold

(P

ro)

1052

9601

1052

9602

1052

9603

1052

9604

1052

9605

1052

9606

1052

9607

1052

9608

1052

9609

94B

urne

r T

ray,

I I D

, 4 S

tage

,S

plit

Man

ifold

(N

at)

1055

0701

1055

0702

1055

0703

1055

0704

1055

0705

1055

0706

1055

0707

1055

0708

1055

0709

95B

urne

r Tr

ay,

St.

Pilo

t, 4

Sta

ge,

Spl

it M

anifo

ld (

Pro

)10

5503

0110

5503

0210

5503

0310

5503

0410

5503

0510

5503

0610

3303

0710

3305

0810

3305

09

96B

urne

r Tr

ay, I

ID, M

ech.

Mod

.S

plit

Man

ifold

(N

at)

1055

0701

1055

0702

1055

0703

1055

0704

——

——

——

——

——

97B

urne

r Tr

ay, I

I D

, Mec

h. M

od.,

3 &

4 S

ect.

Man

ifold

(N

at)

——

——

——

——

1055

1201

1055

1202

1055

1203

1055

1204

1055

1205

98B

urne

r Tra

y, S

t. P

l. M

ech.

Mod

. SpI

t. M

anifo

ld (

Pro

)10

5503

0110

5503

0210

5503

0310

5503

04—

——

——

——

——

—

99B

urne

r Tra

y, S

t. P

l., M

ech.

Mod

., 3

Sec

t. M

anifo

ld (

Pro

)—

——

——

——

—10

5505

0110

5505

0210

5505

0310

5505

0410

5505

05

100

Com

bina

tion

Gas

Val

ve,

V00

5960

0V

0059

600

V00

5960

0V

0070

400

V00

7040

0V

0070

400

——

——

——

4 S

tage

, (N

at)

(2)

(2)

(2)

(2)

(2)

(2)

101

Saf

ety

Gas

Val

ve, 4

Sta

ge (

Nat

)—

——

——

——

——

——

—V

0046

700

V00

4680

0V

0046

800

102

Ope

ratin

g/R

eg. G

as V

alve

,4

Sta

ge (

Nat

)—

——

——

——

——

——

—V

0051

300

V00

5130

0V

0051

300

(2)

(2)

(2)

103

Com

bina

tion

Gas

Val

ve,

V00

7080

0V

0070

800

V00

7080

0V

0070

900

V00

7090

0V

0070

900

V00

7090

0—

——

—4

Sta

ge, (

Pro

)(2

)(2

)(2

)(2

)(2

)(2

)(2

)

104

Saf

ety

Gas

Val

ve,

4 S

tage

, (P

ro)

——

——

——

——

——

——

——

V00

4670

0V

0046

700

105

Ope

ratin

g/R

eg. G

as V

alve

,4

Sta

ge (

Pro

——

——

——

——

——

——

——

V00

5490

0V

0054

900

(2)

(2)

106

Mod

usna

p G

as V

alve

, (H

H &

PH

V00

4510

0V

0045

100

V00

4510

0V

0045

100

——

——

——

——

——

Onl

y), M

ech.

Mod

. (N

at &

Pro

)V

0071

100

V00

7110

0V

0071

100

V00

7110

0V

0071

100

V00

7110

0V

0071

100

V00

7110

0V

0071

100

(3)

(3)

(3)

N(4

) &

P(3

)N

(4)

& P

(3)

107

Ope

ratin

g/R

eg. G

as V

alve

,M

ech.

Mod

. (N

at)

V00

4760

0V

0047

600

V00

4760

0V

0047

600

V00

4770

0V

0047

700

V00

4770

0V

0047

800

V00

4780

0

108

Ope

ratin

g/R

eg. G

as V

alve

,V

0054

800

V00

5480

0V

0054

800

V00

5480

0V

0054

800

V00

5480

0V

0054

900

V00

5490

0V

0054

900

Mec

h. M

od. (

Pro

)N

OT

E: N

umbe

rs in

()

repr

esen

t qua

ntity

req

uire

d fo

r ea

ch s

ize.

Qua

ntity

is o

ne o

ther

wis

e.


Figure 21. Outdoor Parts.


eyD

escr

iptio

nM

od

elM

od

elM

od

elM

od

elM

od

elM

od

elM

od

elM

od

elM

od

elN

o5

00

60

07

15

85

010

1012

0014

3016

7018

25

1To

p P

anel

Ass

embl

y1

06

60

70

11

06

60

70

21

06

60

70

31

06

60

70

41

06

60

70

51

06

60

70

61

06

60

70

71

06

60

70

81

06

60

70

9

2R

ear

Win

dshi

eld

10

65

81

01

10

65

81

02

10

65

81

03

10

65

81

04

10

65

81

05

10

65

81

06

10

65

81

07

10

65

81

08

10

65

81

09

3U

pper

Rea

r Lo

uver

Shi

eld

10

65

71

01

10

65

71

02

10

65

71

03

10

65

71

04

10

65

71

05

10

65

71

06

10

65

71

07

10

65

71

08

10

65

71

09

4R

ear

Pan

el U

pper

10

65

87

01

10

65

87

02

10

65

87

03

10

65

87

04

10

65

87

05

10

65

87

06

10

65

87

07

10

65

87

08

10

65

87

09

5G

ap C

losu

re-S

ide

10

66

02

00

10

66

02

00

10

66

02

00

10

66

02

00

10

66

02

00

10

66

02

00

10

66

02

00

10

66

02

00

10

66

02

00

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

6G

ap C

losu

re-M

iddl

e1

06

60

10

01

06

60

10

01

06

60

10

01

06

60

10

01

06

60

10

01

06

60

10

01

06

60

10

01

06

60

10

01

06

60

10

0

7Lo

wer

Rea

r P

anel

Ass

embl

y1

06

60

50

11

06

60

50

21

06

60

50

31

06

60

50

41

06

60

50

51

06

60

50

61

06

60

50

71

06

60

50

81

06

60

50

9

8R

ear

End

Pan

el L

ft. &

Rt.

10

65

77

00

10

65

77

00

10

65

77

00

(2)

10

65

77

00

10

65

77

00

10

65

77

00

10

65

77

00

10

65

77

00

10

65

77

00

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

9Lo

wer

Rea

r S

hiel

d In

ner

10

65

99

01

10

65

99

02

10

65

99

03

10

65

99

04

10

65

99

05

10

65

99

06

10

65

99

07

10

65

99

08

10

65

99

09

10

Rea

r B

ase

Ext

ensi

on1

06

58

50

11

06

58

50

21

06

58

50

31

06

58

50

41

06

58

50

51

06

58

50

61

06

58

50

71

06

58

50

81

06

58

50

9

11G

as T

rain

Int

erfa

ce P

late

20

05

02

00

20

05

02

00

20

05

02

00

20

05

02

00

20

05

02

00

20

05

02

00

20

05

02

00

20

05

02

00

20

05

02

00

12

Fro

nt E

nd P

anel

10

65

75

00

10

65

75

00

10

65

75

00

10

65

75

00

10

65

75

00

10

65

75

00

10

65

75

00

10

65

75

00

10

65

75

00

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

13

Fro

nt B

ase

Ext

ensi

on1

06

59

70

11

06

59

70

21

06

59

70

31

06

59

70

41

06

59

70

51

06

59

70

61

06

59

70

71

06

59

70

81

06

59

70

9

14

Do

or

10

66

08

01

10

66

08

02

10

66

08

03

10

66

08

04

10

66

08

05

10

66

08

06

10

66

08

07

10

66

08

08

10

66

08

09

(2)

(2)

(2)

(2)

(2)

15

Fro

nt W

inds

hiel

d1

06

59

10

11

06

59

10

21

06

59

10

31

06

59

10

41

06

59

10

51

06

59

10

61

06

59

10

71

06

59

10

81

06

59

10

9

16

Fro

nt P

anel

Upp

er1

06

58

90

11

06

58

90

21

06

58

90

31

06

58

90

41

06

58

90

51

06

58

90

61

06

58

90

71

06

58

90

81

06

58

90

9

17

Flu

e P

anel

Fro

nt1

06

59

50

11

06

59

50

21

06

59

50

31

06

59

50

41

06

59

50

51

06

59

50

61

06

59

50

71

06

59

50

81

06

59

50

9

18

Flu

e P

anel

Rea

r1

06

59

30

11

06

59

30

21

06

59

30

31

06

59

30

41

06

59

30

51

06

59

30

61

06

59

30

71

06

59

30

81

06

59

30

9

19

Rai

n S

hiel

d-C

ontr

ol B

ox1

06

60

40

01

06

60

40

01

06

60

40

01

06

60

40

01

06

60

40

01

06

60

40

01

06

60

40

01

06

60

40

01

06

60

40

0(N

ot s

how

n)

See

Par

ts Il

lust

rati

on

On

Pag

e 21

5R

ear

Pan

el, F

lue

Col

lect

or10

6617

0110

6617

0210

6617

0310

6617

0410

6617

0510

6617

0610

6617

0710

6617

0810

6617

09

6R

ear

Pan

el, F

lue

Col

lect

or E

xt.

1066

1801

1066

1802

1066

1803

1066

1804

1066

1805

1066

1806

1066

1807

1066

1808

1066

1809

NO

TE

: Num

bers

in (

) re

pres

ent q

uant

ity r

equi

red

for

each

siz

e. Q

uant

ity is

one

oth

erw

ise.

SECTION 7. Outdoor Parts Descriptions and Order Numbers


Key

Des

crip

tion

Mo

del

Mo

del

Mo

del

Mo

del

Mo

del

Mo

del

Mo

del

Mo

del

Mo

del

No

50

06

00

71

58

50

1010

1200

1430

1670

1825

7F

ront

Sup

port

, F

lue

Col

lect

or1

06

62

10

11

06

62

10

21

06

62

10

31

06

62

10

41

06

62

10

51

06

62

10

61

06

62

10

71

06

62

10

81

06

62

10

9

8Ti

le C

over

, Fro

nt &

Rea

r1

06

61

50

11

06

61

50

21

06

61

50

31

06

61

50

41

06

61

50

51

06

61

50

61

06

61

50

71

06

61

50

81

06

61

50

9(2

)(2

)(2

)(4

)(4

)(4

)(4

)(4

)(4

)

10

Baf

fle,

Hea

t E

xcha

nger

10

66

77

01

10

66

77

02

10

66

77

03

10

66

77

04

10

66

77

05

10

66

77

06

10

66

77

07

10

66

77

08

10

66

77

09

(7)

(14)

(14)

(14)

(14)

(28)

(28)

(28)

(14)

41

Mid

dle

Fro

nt P

anel

10

66

20

01

10

66

20

02

10

66

20

03

10

66

20

04

10

66

20

05

10

66

20

06

10

66

20

07

10

66

20

08

10

66

20

09

42

Sw

eep

She

et F

lue

10

66

22

01

10

66

22

02

10

66

22

03

10

66

22

04

10

66

22

05

10

66

22

06

10

66

22

07

10

66

22

08

10

66

22

09

Col

lect

or

48

Bas

e T

ile S

uppo

rt1

06

02

30

11

06

02

30

21

06

02

30

31

06

02

30

41

06

02

30

51

06

02

30

61

06

02

30

71

06

02

30

81

06

02

30

9

69

Tub

e A

ssem

bly,

Cop

per

10

66

59

01

10

66

59

02

10

66

59

03

10

66

59

04

10

66

59

05

10

66

59

06

10

66

59

07

10

66

59

08

10

66

59

09

70

Tub

e A

ssem

bly,

Cup

ro-N

icke

l1

06

70

40

11

06

70

40

21

06

70

40

31

06

70

40

41

06

70

40

51

06

70

40

61

06

70

40

71

06

70

40

81

06

70

40

9

NO

TE

: Num

bers

in (

) re

pres

ent q

uant

ity r

equi

red

for

each

siz

e. Q

uant

ity is

one

oth

erw

ise.

Pump Rotating Sections and Repair PartsCheck pump assembly on heater for H.P. rating and find correct Laars part number from table below.

Description 1/4 HP 1/3 HP 3/4 HP

Pump Rotating Assembly, B&G, 1522 w/3 “ IMP, Bronze, 1P A0048700 —— ——Pump Rotating Assembly, B&G, Series 90 w/3 “ Impeller, 1P A0077100 —— ——Pump Rotating Assembly, TACO 1630 w/3 “ Impeller, 1P A0071000 —— ——Pump Rotating Assembly, TACO 1630 w/4" Impeller, 1P —— A0071200 ——Pump Rotating Assembly, B&G, 1522 w/4" Impeller, Bronze, 1P —— A0047500 ——Pump Rotating Assembly, B&G Series 90, w/4" Impeller, 1P —— A0077200 ——Pump Rotating Assembly, TACO 1630 w/5 “ Impeller, 1P —— —— A0071400Pump Rotating Assembly, B&G 1522 w/5 “ Impeller, Bronze, 1P —— —— A0047700Pump Rotating Assembly, B&G Series 90, w/5 “, Impeller, 1P —— —— A0077300Motor, Pump, B&G 1522 - I P A0054400 A0054800 A0055600Coupler, Pump, B&G - Universal A0020200 A0020200 A0020200Bearing Assembly, Pump, B&G 1522 - Universal A0021600 A0021600 A0021600Bearing Assembly, Pump, B&G 1522, Bronze A0022100 A0022100 A0022100Gasket, Pump, B&G 1522 - #PW1 -2151 A0021400 A0021400 A0021400Mounting Ring, B&G 1522 Motors A0065100 A0065100 A0065100Impeller, B&G 1522 - 3" A0058100 A0058100 A0058100Impeller, B&G 1522 - 4" A0058200 A0058200 A0058200Impeller, B&G 1522 - 5" A0058400 A0058400 A0058400

Automatic Reset Temp. Limit Switch .....................................................................................................................E0014400Manual Reset High Gas Pressure Switch ...............................................................................................................E0023300Manual Reset Low Gas Pressure Switch ................................................................................................................E0023500Alarm Bell, 110 Volts ...............................................................................................................................................A0014200Outdoor Reset, Single Stage 30' Bulb .....................................................................................................................E0067600Outdoor Reset, Two Stage, 30' Bulb .......................................................................................................................E0084200Low-water Cut-off, Electronic, Manual Reset ..........................................................................................................E0067900Low-water Cut-off, Electronic, Automatic Reset With Test Button ...........................................................................E2024200

Gas valve types and sizes vary with different boiler models, with different fuels and with different firing options. For service and replacement,copy exact number from nameplate giving manufacturer’s name and pipe size.

SECTION 8. Optional Parts Descriptions and Order Numbers

Energy Management Monitor (EM2)STANDARD COMPONENTS

Description Part No.

On/Off Auto Switch E0109200Time Delay Relay, 24 VAC E2077700Time Delay Relay, 120 VAC E2077800

OPTIONAL EQUIPMENT

Description Part No.Remote Aquastat, 110-240F E0014400Immersion Well E0025900Note: The Remote Aquastat and the Immersion Well, whenrequired, should be ordered separately.

Waterpik Technologies, Inc.6000 Condor Drive, Moorpark, CA 93021 • 805.529.2000 • FAX 805.529.593420 Industrial Way, Rochester, NH 03867 • 603.335.6300 • FAX 603.335.3355480 S. Service Road West, Oakville, Ontario, Canada L6K 2H4 • 905.844.8233 • FAX 905.844.2635www.laars.com Litho in U.S.A. © Laars Heating Systems 0011 Document 2040DH

0105

000D

Documents

Installation and Operation Instructions for Mighty Therm · 2012. 1. 4. · Sizes 500-1825 These instructions are to be stored in the pocket provided on the boiler. ... Introduction