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Installation and Operation Instructions Document 3006S

H00

6730

0S

Model APSizes 500 - 1825

These instructions are to be stored in thepocket provided on the heater.

Installation and OperationInstructions for

Mighty ThermPool Heating Boiler

WARNINGIf the information in this manual is notfollowed exactly, a fire or explosion mayresult causing property damage, personalinjury or loss of life.

Do not store or use gasoline or otherflammable vapors and liquids in the vicinityof this or any 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'sinstructions.

• If you cannot reach your gas supplier, callthe fire department.

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

FOR YOUR SAFETY: This product must be installed and serviced by a professional service technician,qualified in hot water boiler 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.

AVERTISSEMENTAssurez-vous de bien suivres les instructionsdonnées dans cette notice pour réduire auminimum le risque d’incendie ou d’explosion oupour éviter tout dommage matériel, touteblessure ou la mort.

Ne pas entreposer ni utiliser d’essence nid’autres vapeurs ou liquides inflammables dansle voisinage de cet appareil ou de tout autreappareil.QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ:

• Ne pas tenter d’allumer d’appareils.• Ne touchez à aucun interrupteur. Ne pas vous

servir des téléphones dansle bâtiment où vousvous trouvez.

• Appelez immédiatement votre fournisseur degaz depuis un voisin. Suivez les instructionsdu fournisseur.

• Si vous ne pouvez rejoindre le fournisseur degaz, appelez le sservice des incendies.

L’installation et l’entretien doivent être assurés parun installateur ou un service d’entretien qualifié oupar le fournisseur de gaz.

LAARS HEATING SYSTEMS

TABLE OF CONTENTS

SECTION 1.General Information1.1 Introduction ................................................... 31.2 Heater Identification ..................................... 31.3 Primary/Secondary Pump and Piping ........... 31.4 Certifications ................................................. 31.5 Engineering Assistance ................................ 3

SECTION 2.Installation2.1 Boiler Placement .......................................... 42.2 Installation of Indoor Boilers ......................... 42.2.1 Combustion Air Supply ................................. 42.2.2 Venting ......................................................... 52.2.3 Common Venting System

Test Procedure ............................................. 62.2.3 Instructions Relatives au Test des

Systèmes à Évent Commun ......................... 62.3 Installation of Outdoor Boilers ...................... 72.4 Gas Supply and Piping ................................. 72.5 Electrical Wiring ............................................ 82.6 General Piping Instructions .......................... 92.7 Boiler By-Pass Piping ................................... 92.8 Temperature Sensor Placement

and Installation ............................................ 102.9 Automatic Chlorinators ............................... 10

SECTION 3.Operation3.1 Controls - General ...................................... 113.2 Initial Start-Up ............................................. 123.3 Safety Shutoff Component Checkout ......... 123.4 Inlet Temperature and

Temperature Rise Adjustment .................... 133.5 Heater Shut Down ...................................... 133.6 Spring and Fall Operation

Stand-by Service ........................................ 133.7 Winter Operation Complete Shutdown ....... 143.8 Time Clock Operation ................................. 143.9 Therapeutic Pools (Spas) ........................... 14

SECTION 4.Maintenance ..............................................15

SECTION 5.Troubleshooting .......................................16

SECTION 6.Parts Description and Order Numbers ....... 18

Mighty Therm Commercial Pool Heating Boiler

SECTION 1.General Information1.1 Introduction

This manual provides information for theinstallation and operation of Laars Model AP poolheating boilers. It is strongly recommended that allapplication and installation procedures be reviewedcompletely before proceeding with the installation.Consult the Laars factory, or local factoryrepresentative, with any problems or questionsregarding this equipment. Experience has shown thatmost problems are caused by improper installation, notsystem design.

Some accessory items are shipped in separatepackages. Verify receipt of all packages listed on thepacking 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.

The warranty does not apply to heaters notinstalled or operated in accordance with theseprocedures. Consult local building and safety codesbefore proceeding with work. The installation mustconform to the requirements of the authority havingjurisdiction or, in the absence of such requirements, tothe latest edition of the National Fuel Gas Code; ANSIZ223.1, National Electrical Code ANSI/NFPA 70. InCanada, the installation must conform with the latestedition of CAN/CGA-B149 requirements.

When required by the authority havingjurisdiction, the installation must conform to

Figure 1. Heater Identification (model nomenclature).

WARNINGThe model AP commercial pool heating boilermust be used on potable water only. Forheating pools containing salt water, a speciallyequipped heater must be used; consult yourdistributor or factory representative. The poolheating boiler must be installed in accordancewith the procedures outlined in this manual.

MODEL

AP-POOL

REVISION

P-PUMP (U.S.)Q-PUMP (CAN)

HEAT EXCHANGER

C-GLASS LINED/COPPERN-GLASS LINES/CU-NIK-BRONZE/COPPERS-BRONZE/CU-NI

VERSION

1 - 8 TUBEB-10 TUBE

I-INDOOR

E-OUTDOOR

FUEL

N-NATURALP-PROPANE

IGNITION

04-SPARK 110V09-SPARK 24V

11-SPARK 24V

16-STND. PILOT

SIZE

BTU/HR X 10000500060007150850099910101200143016701825

C

FIRING MODE

ON/OFF

1 2 3 4 5 6 7 8 9 10 11 12 13 14

American Society of Mechanical Engineers safetycodes for controls and safety devices for automaticallyfired heaters No. CSD-1, and in Canada CGA 3.3.Any modification of the heater, its gas controls, gasorifices, wiring or drafter diverter may void the Laarswarranty. If field conditions require suchmodifications, consult factory.

1.2 Heater IdentificationConsult rating plate on the heating boiler. Shown

below is a breakdown of the model nomenclature.Laars commercial pool heating boilers are available intwo configurations: an indoor version and an outdoorversion. Outdoor models are not available in Canada.

1.3 Primary/Secondary Pump and PipingAll models are supplied with integrally mounted

pumps. The 1825 models use a 3/4 HP pump and allother models are supplied with 1/2 HP pumps. Thesepumps are sized for the pressure drop through the heatexchanger and through the bypass piping as shown inFigure 10.

Any deviations from the arrangement shown mayincrease the head on the pump, reduce flow and hinderperformance (see Section 2.7). For spas see Section3.9.

This piping arrangement and the integral pumpallow hot water to be recirculated to the heater inlet,thus raising the inlet temperature and greatly reducingcondensation.

1.4 CertificationsAll models are design-certified by AGA and

CGA for natural or propane gas and conform toASME Code requirement for 160 PSI water pressure.

1.5 Engineering AssistanceConsult the factory or distributor regarding any

questions or problems which arise in the specification,installation or operation of Laars equipment. Anexperienced engineering staff is ready to assist inassuring the proper performance and application ofLaars products.


SECTION 2.Installation2.1 Boiler Placement

The pool heating boiler must be placed toprovide specific clearances on all sides formaintenance and inspections. There must also beminimum distances maintained from combustiblesurfaces. These clearances also apply tononcombustible materials because the pool heatingboiler requires air circulation for proper operation.

The pool heating boiler should be mounted on alevel surface. An integral base for an installation oncombustible flooring is provided as standardequipment on outdoor models. For indoor models,special base rails part number 10539000 must be usedfor combustible flooring.

Do not install a pool heating boiler on carpeting.Under the national Fuel Gas Code, ANSI

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

2.2 Installation of Indoor BoilersLocate the pool heating boiler to provide

adequate clearance for inspection and service on allsides. See Table 1. For alcove installation, seeFigure 6.

Install indoor heaters on a waterproof floor withan adequate floor drain and a 6" (152mm) minimumcurb on all four sides to protect the building if heaterrepairs are required. The manufacturer will not beheld liable for any water damage in connectionwith this boiler.

2.2.1 Combustion Air SupplyThe heater location must provide sufficient air

supply for proper combustion and ventilation of thesurrounding area as outlined in the latest edition ofANSI standard Z223.1, and any local codes that maybe applicable. Inadequate combustion air supply mayresult in incomplete combustion, sooting of the heatexchanger, and unsafe operation of the boiler.

a. Conventional VentilationIn the United States, these requirements specify

that small boiler rooms should be provided with twopermanent air supply openings communicatingdirectly through the wall to outside air one within 12inches (305mm) of the ceiling, and the other within12 inches (305mm) of the floor. Each opening shouldhave a minimum free area of one square inch(6.5 sq. cm) per 4,000 BTU/hr input of the total inputrating of all appliances in the enclosed area. See Table2 for recommended air supply for each model. Animproperly ventilated equipment room can get

Clearance Indoor Outdoorfrom in. mm in. mm

Top 30 762 unobstructed

Water Conn. side 12* 305 24 610

Pump side 6* 152 24 610

Front Alcove* unobstructed

Rear 8 203 24 610

Vent pipe** 6 152 - - -

Hot water pipes per code per code

* Water connection and pump side clearances of 24" (610mm)and front clearances of 48" (1219mm) will allow easierservice access.

** Using type B vent (refer to Manufacturer's Instructions).

Table 1. Minimum boiler clearances fromadjacent surfaces.

Figure 2. Typical Boiler Installation on Concrete Slab.

Figure 3. Typical Boiler Installation on Roof UsingRaised Platform (wood).

excessively hot and cause accelerated deteriorationof controls and electrical components.

In Canada, Table 2 does not apply. Consult localbuilding codes or, in the absence of suchrequirements, follow CGA requirements and/or CAN/CGA B-149 standard.


Figure 4. Typical Boiler Installation on RoofUsing 4x4 Stringer.

Figure 5. Installation on Concrete Blocks or Tile.

b. Forced-Air VentilationIn the United States: any equipment which

exhausts air from the boiler room can deplete thecombustion air supply or reverse the natural draftaction of the venting system. This could cause flueproducts to accumulate in the boiler room. Additionalair must be supplied to compensate for such exhaust.The information in Table 2 is not applicable ininstallations where exhaust fans or blowers of anytype are used. Such installations must be designed byqualified engineers.

In Canada: follow Canadian standard, CAN/CGA B-149 or local codes.

If a blower or fan is used to supply air to theboiler room, the installer should make sure it does notcreate drafts which could cause nuisance shutdowns ofthe pilot. If a blower is necessary to provide adequatecombustion air to the boiler, a suitable switch orinterlock must be wired into the heater control circuitto prevent the heater from firing unless the blower isoperating.

The boiler must be completely isolated andprotected from any source of corrosive chemical fumessuch as trichlorethylene, perchloroethylene, chlorine, etc.

2.2.2 VentingLaars boilers have built-in draft diverters for

natural draft operation and must not be connected toany portion of a mechanical draft system underpositive pressure. The flue outlet must be connected toa clear, unobstructed vent of adequate capacity endingabove the highest point of the building with anapproved vent cap. The venting system should beinstalled according to the latest edition of ANSIZ223.1 and/or, in Canada, CAN/CGA B-149 and anylocal codes having jurisdiction.

Do not weld or fasten the vent pipe to the boilerdrafthood. The weight of the stack must not rest on theboiler. The drafthood and boiler top must be easilyremovable for normal boiler service and inspection.

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

Avoid using long horizontal runs of the ventpipe, and too many 90° elbows, reductions orrestrictions. Horizontal runs should have at least a1/4" (6mm) rise per foot in the direction of flow. Avent connector should be supported for the design andweight of the material used to maintain clearances andprevent physical damage and separation of joints.

Avoid terminating boiler vents near airconditioning or air supply fans. The fans can pick upexhausted flue products from the boiler and returnthem inside the building creating a possible healthhazard. A minimum of 4 feet (1.2m), in Canada 6 feet(1.8m), horizontal distance must be maintained fromelectrical meters, gas meters, and relief equipment.

Figure 6. Alcove Installation.

Base must extend outmin. 12" (305mm) onall sides of heater frame.

20 ga. min.galvanizedsheet metal under entireheater.

Concrete blocks or tile min. 7" (178mm)high with 3" (76mm) min. air openings.

Blocks must provide solid base and be braced so theycannot slip out of place. Air openings in blocks must bearranged to provide unobstructed opening through entirewidth or length of base.

* When the ceiling height exceeds 8 feet, you are only allowed to consider 8 feet whencalculating the total volume of the enclosure.

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WaterHeater

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CLOSET INSTALLATION(UNACCEPTABLE)

A closet is any 4 sided enclosure which isless than 16* times the total volume of allthe gas fired appliances within theenclosure.

ROOM INSTALLATION(ACCEPTABLE)

A room is any enclosure which is at least16* times greater than the total volumeof all the gas fired appliances within theenclosure.

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WaterHeater

ALCOVE INSTALLATION(ACCEPTABLE)

An alcove suitable for the installation ofa water heater is a restricted section ofa room not separated from the room bya door or partition and which meets theminimum clearances for the specificmodel water heater listed below.


Always use double-wall or insulated vent pipe(Type B or equivalent). In cold weather, uninsulatedoutside vents can chill the rising flue productsblocking the natural draft action of the ventingsystems. This can create a health hazard by spillingflue products in the boiler room.

Avoid oversized vent piping or extremely longruns of pipe which may cause excessive cooling andcondensation. Rule of Thumb: the total length of thevent, including the connector and any offset, shouldnot exceed 15 feet (4.6m) for every inch (25mm) ofvent diameter. Longer total lengths shown in ventingtables are based on maximum capacity, notcondensation factors.

When the installation of a draft fan is necessaryin connecting a venting system to a Laars boiler, theinstallation should be engineered by competentpersonnel following good engineering practices. Thedraft fan supplier should be consulted for correct size.The installation should be in accordance with thelatest edition of ANSI Z223.1 and/or, in Canada,CAN/CGA B-149 and any local codes havingjurisdiction. When a draft fan is installed, a suitabledraft switch must be wired into the boiler controlcircuit at terminal designated "Field Interlock" toprevent firing of the boiler unless a positive draft hasbeen established.

2.2.3 Common Venting SystemTest ProcedureAt the time of the removal of an existing heater,

the following steps shall be followed with eachappliance remaining connected to the common ventingsystem. During the testing of each unit, the otherappliances remaining connected to the commonventing system should not be operated.1. Seal any unused openings in the common

venting system.2. Visually inspect the venting system for proper

size and horizontal pitch. Determine that there isno blockage or restriction, leakage, corrosion, orother deficiencies which could cause an unsafecondition.

3. Insofar as it is practical, close all building doorsand windows. Also close all doors between thespace in which the appliances remainingconnected to the common venting system arelocated and the other spaces of the building. Turnon any clothes dryer and any appliance notconnected to the common venting system. Turnon any exhaust fans, including range hoods andbathroom exhausts, so they will operate atmaximum speed. Do not operate a summerexhaust fan. Close all fireplace dampers.

4. Place in operation the appliance being inspected.Follow the lighting instructions for the unit.Adjust the thermostat so the appliance willoperate continuously.

5. Test for spillage at the draft hood relief openingafter 5 minutes of main burner operation. Use theflame of a match or candle, or smoke from acigarette, cigar, or pipe.

6. After it has been determined that each applianceremaining connected to the common ventingsystem properly vents when tested as outlinedabove, return doors, windows, exhaust fans,fireplace dampers and any other gas-burningappliance to their previous condition of use.

7. Any improper operation of the common ventingsystem should be corrected so the installationconforms with the National Fuel Gas Code,ANSI Z223.1 and/or CAN/CGA B149,Installation Codes. When resizing any portion ofthe common venting system, the commonventing system should be resized to approach theminimum size as determined using theappropriate tables in Appendix G in the NationalFuel Gas Code, ANSI Z223.1 and/or CAN/CGAB149 Installation Codes.

2.2.3 Instructions Relatives au Test des Systèmesà Évent CommunAu moment du restrait d’une chaudière existante,

les mesures suivantes doivent être prises pour chaqueappareil toujours reccordé au système d’évacuation nefonctionnet pas:1. Sceller toutes les ouvertures non utilisées du

systèmes d’évacuation.2. Inspecter de façon visuelle le système

d’évacuation pour déterminer la grosseur etl’inclinaison horizontale qui conviennent ets’assurer que le système est exemptd’obstruction, d’étranglement, de fuite, decorrosion et autres défaillances qui pourraientprésenter des risques.

3. Dans la mesure du possible, fermer toutes lesportes et les fenêtres du bâtiment et toutes lesportes entre l’espace où les appareils toujoursraccordés au système d’évacuation sont installéset les autres espaces du bâtiment. Mettre enmarche les sécheuses, tous les appareils nonraccordés au système d’évacuation common ettous les ventilateurs d’extraction comme leshottes de cuisinière et les ventilateurs des sallesde bain. S’assurer que ces ventilateursfonctionnent à la vitesse maximale. Ne pas fairefonctionner les ventilateurs d’été. Fermer lesregistres des cheminées.

4. Mettre l’appareil inspecté en marche. Suivre lesinstructions d’allumage. Régler le thermostat defaçon que l’appareil fonctionne de façoncontinue.

5. Faire fonctionner le brûleur principal pendant 5min ensuite, déterminer si le coupe-tiragedéborde à louverture de décharge. Utiliser la


flamme d’une chandelle ou la fumée d’unecigarette, d’une cigare ou d’une pipe.

6. Une fois qu’il a été déterminé, selon la méthodeindiquée ci-dessus, que chaque appareil raccordéau systéme d’évacuation est mis à l’air libre defaçon adéquate. Remettre les portes et lesfenêtres, les ventilateurs, les registres decheminées et les appareils au gaz à leur positionoriginale.

7. Tout mauvais fonctionnement du systémed’évacuation commun devrait être corrigé defaçon que l’installation soit conforme auNational Fuel Gas Code, ANSI.Z223.1 et (ou)aux codes d’installation CAN/CGA-B149. Si lagrosseur d’une section du système d’évacuationdoit être modifiée, le système devrait êtremodifié pour respecter les valeurs minimales destableaux pertinents de l’appendice G du NationalFuel Gas Code, ANSI Z2231.1 et (ou) des codesd’installation CAN/CGA-B149.

2.3 Installation of Outdoor Boilers(Not available in Canada)

1. Locate the boiler to provide the clearances aslisted in Table 1, “Minimum Boiler Clearances.”

2. Do not place the boiler in an enclosure or wallrecess. Avoid locations where wind deflectionoff structures might cause downdraft. When suchwind conditions are possible, place the heater atleast 3 feet (0.9m) from the structures.

3. Never install the boiler under any kind of roofoverhang. Do not place the boiler 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 CSA designedcertified for outdoor installations, suchinstallations are not recommended in areas wherethe danger of freezing exists unless properprecautions are taken for freeze protection.

Outdoor installations are not recommended inareas where the danger of snow blockage exists.

WARNINGLiquefied petroleum gas is heavier than air.Therefore, the pool heating boiler should not beinstalled in pits or other locations where gascould accumulate.

The boiler should be located a safe distance fromPropane gas storage and filling equipment. Consultlocal codes and fire protection authorities for adviceon specific installation restrictions.

2.4 Gas Supply and PipingReview the following instructions before

proceeding with the installation.1. Verify that the boiler is fitted for the proper type

of gas by checking the rating plate. Laars boilersare normally equipped to operate below a2000 foot (609.6m) altitude. Boilers equipped tooperate at higher altitudes have appropriatestickers or tags attached, also printed informationon rating plate.

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

3. A sediment trap (drip leg) must be providedahead of the gas controls (see Figure 8). Amanual gas shutoff valve must also be providedfor service convenience and safety. Check thelocal codes.

Boiler Each Opening*Size square inches square cm

500 125 806.5600 150 967.8

715 179 1154.9

850 213 1374.3

1010 253 1632.4

1200 300 1935.6

1430 358 2309.8

1670 418 2696.9

1825 457 2948.6

* Net Free Area.

Check with louver manufacturers for net free area of louvers.Correct for screen resistance to the net free area if a screen isinstalled. Check all local codes applicable to combustion air.

Area indicated is for one of two openings: one at floor leveland one at the ceiling, so the total net free area could bedouble the figures indicated. For special conditions refer to thelatest editon of ANSI Z223.1.

Consult factory if openings do not communicate directlythrough the walls with the outdoors.

Table 2. Minimum Recommended Air Supply to Boiler.

Figure 7. Incorrect Outdoor Installation.


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

factory tested and conforms to the safe lighting andother performance criteria specified in the latesteditions of ANSI Z21.13.CSA4.9 Low Pressure BoilerStandard.

Before operating the boiler, the complete gassupply system and all connections must be tested forleaks using a soap solution. Do not use raw flame.

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.

2.5 Electrical Wiring

WARNINGThe boiler must be electrically grounded inaccordance with the most recent edition of theNational Electrical Code, ANSI/NFPA 70. InCanada, all electrical wiring to the boiler shouldbe in accordance with the latest edition of CSAC22.1 Canadian Electrical Code, Part 1. Do notrely on the gas or water piping to ground themetal parts of the boiler. Plastic pipe ordielectric unions often isolate the boilerelectrically. Service and maintenancepersonnel who work on or around the heatermay be standing on wet floors and could beelectrocuted by an ungrounded boiler.

Wiring diagrams are included in the informationpacket provided with each unit.

1. All Model AP pool heating boilers need 115V60Hz supply voltage unless specifically orderedotherwise.

2. The 1825 models are supplied with 3/4 HP pumpmotors rated at 115/230V, FLA 8.8/4.4. All othermodels are supplied with 1/2 HP pump motorsrated at 115/230V, FLA 5.8/2.9. Consult theNational Electrical Code or the CanadianElectrical Code regarding branch circuitrequirements for equipment with these motors.

3. The boilers should be wired exactly as shown inthe wiring diagram.

Distance from Gas MeterBoiler or Last Stage RegulatorSize 0-100' 100-200' 200-300'

0-30.5m 30.5-61m 61-91.4m

500 1½" 2" 2"600 1½" 2" 2½"715 2" 2" 2½"850 2" 2½" 2½"

1010 2" 2½" 3"1200 2½" 3" 3"1430 2½" 3" 3"1670 2½" 3" 3

1825 2½" 3" 3½"

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 Propane Gas, reduce pipe diamter one size. Anaverage number of tees and elbows have been taken into account.

Table 3. Gas Piping Sizes.

Figure 8. Sediment Trap Installation.

ToEquipmentInlet

Gas SupplyInlet

TeeFitting

3" (76mm) Min.

Cap

Nipple

4. The boiler and its individual shutoff valve mustbe disconnected from the gas supply pipingsystem during any pressure testing of that systemat test pressures in excess of 1/2 psig (3.5kPa).The boiler must be isolated from the gas supplypiping system by closing its individual manualgas shutoff valve during any pressure testing ofthe piping system at test pressures equal to orless than 1/2 psig (3.5kPa).

5. Provide gas supply pressure to the heater asfollows:

Natural Gas Propane GasIn. W.C. kPa In. W.C. kPa

Max. 10 2.5 14 3.4Min. 6.5 1.6 11 2.7

NOTE: the heater and all other gas appliances sharingthe boiler gas supply line must be firing at maximumcapacity to properly measure the inlet supply pressure.Low gas pressure could be an indication of anundersized gas meter and /or obstructed gas supplyline.


IMPORTANT NOTE: The pool filter pump andboiler must be electrically interlocked so the boilercannot come on unless the pump is running and thereis full flow in the filter piping where the boiler isconnected. If the pool filter pump operation isintermittent the boiler must be shut off prior to pumpshutdown. See paragraph heading Auxiliary TimeClock Wiring below. If the backwash operation ismanual the boiler must be shut off manually duringbackwashing.

Auxiliary Time Clock Wiring:If a time clock is used to control the filter pump

operation, a separate switch or relay must be used toshut off the boiler at least 15 minutes before the filterpump is shut off. Wire the switch or relay (often calledthe Fireman Switch) to the terminals shown in thewiring diagram as “Field Interlock.”

4. All field installed electrical safety devices and allfield installed controllers (valve end switches,draft switches, relays, timers) can be connectedto the boiler control to the terminals shown in thewiring diagram designated “Field Interlock.”

5. Field location of the temperature sensor isdescribed in Section 2.8.

Where the boiler is installed with a draft fan referto the fan manufacturer's wiring diagram. The draftswitch should be wired across the field interlockterminals in the boiler control panel.

2.6 General Piping InstructionsIn addition to the bypass valve “B” and outlet

valve “A” shown in Figures 10 and 11, an inlet valve“C” should be provided so that the heater can bereadily isolated for service. All valves should bebutterfly or ball style, not gate valves. For spasapplication see Section 3.9.

Figure 9. Pressure Relief Valve Location.

Since heater outlet temperatures can reach150°F (66°C) in some cases, copper or CPVC arerecommended materials for heater connection piping.PVC material may be used for the inlet valve and thepiping upstream of it.

When pipe, fittings, grids or any other element ofthe filter system are made of plastic materials, theymay be damaged by the momentary "back siphoning"of hot water from the heater when the filter pumpstops running.

The pressure relief valve installed in the tappedopening provided in the outlet header (see Figure 9),must be piped, but not connected, to a drain or floorsink. The drain pipe must be the same size as the valveoutlet and must pitch downward from the valve.Where no special setting of the relief valve is ordered,the factory will furnish a 75 psi setting.

The pressure relief valve lever must be tripped atleast once a year to insure that waterways are clean.When manually operating lever, water will dischargethrough the drain line. Precautions must be taken toavoid contact with hot water and water damage.

2.7 Boiler By-Pass PipingModel 500-1825 boilers do not have an internal

bypass valve and MUST BE PIPED AS SHOWN inFigures 10 and 11. For spas see Section 3.9.

All models are supplied with integral pumps,These pumps are sized for the pressure drop throughthe heat exchanger and through the bypass piping asshown in Figures 10 and 11.

Any deviations from the arrangement shownmay reduce flow, hinder performance, and will voidthe warranty.

2½ inch NPT piping is shown, however, models500I-1430I and models 500E-1010E may be installedusing 2 inch NPT piping.

All models must be installed in the parallelarrangement shown. The "secondary" or boiler pipingmust tee into the filter piping with the inlet and outletconnection spaced a maximum of 18" (450mm) apart(see Figure 11).

To insure that pool inlet water does not exceed104°F, the filter pump loop must circulate at theminimum flow rates shown in Table 4.

The outlet valve “A” and the bypass valve “B”must have a provision for locking the handles in place(or removing them) after the temperature rise and inlettemperature adjustments have been made.

Boiler Model Minimum Filter Pump Flow Rate

500-850 90 GPM

1010-1200 110 GPM

1430 140 GPM

1670-1825 180 GPM

Table 4. Minimum Flow to Supply Heater Loop.


Figure 10. Boiler By-Pass Piping.

2.8 Temperature Sensor Placementand InstallationA temperature sensor with 15 feet (5m) of cable

and an immersion well assembly are supplied with theboiler. These must be installed in the field. Refer toFigures 10 through 12.

1. The immersion well body is provided with a 1/2"NPT. Mount the immersion well on theunderside of the filter circulation piping, justupstream of the boiler inlet tee as close to theboiler as possible (see Figure 11). DO NOTINSTALL in secondary piping or downstreamof the boiler inlet tee.

2. Thread the spring and retainer onto the sensorcable and secure sensor into the immersion well.

3. Route cable to heater control panel in a locationwhere it will not be subject to damage. Securewith nylon cable ties.

2.9 Automatic ChlorinatorsA concentration of chlorine in the heater can be

very destructive, therefor the following rules about theinstallation and operation of such devices must befollowed:

1. The chlorinator should be installed so itintroduces the gas or solution downstream fromthe boiler.

Figure 11. Heater Piping Arrangement.

Suggested By-Pass Loop Fitting

Item Description Material

1 2½" Elbow (See Note) 2½" S-80

2 2½" x 2" ReducingBushing (See Note) CPVC

3 2½" Tee (All Sizes) Copper isoptional

4 2½" Tee (See Note)

A, B,C, D

2½" Ball Valve (See Note)

Note: 2" pipe, fittings and valves are optional for indoor size(500 through 1430) and outdoor size (500 through 1010).


Figure 12. Controls Location.

Rating Plate

ManualPilotValve

WaterCirculatingPump

SafetyGasValve

Operating/SafetyGas Valve

Ignition Control

FlowSwitch

PressureReliefValve

Power(On/Off/Auto)Switch

Pump TimeDelay Relay

OperatingControl

Terminal Strip

In

Out

Hi-Limit

ManualMainGas Valve

2. The chlorinator should be wired so it cannotoperate unless the filter pump is running.

3. The chlorinator should be provided with an anti-siphon device so that the draining of the pipingafter the pump shuts off will not siphon chlorinesolution into the boiler.

4. When the operation of a chlorinator is such thatit must be installed in the pump suction, or someother place where the chlorine solution flowsthrough the heater, corrosion of the heater canoccur. Excessive concentrations of chlorinecaused by improper adjustment or failure of thechlorination equipment cause this corrosion. Theresulting damage to the heat exchanger is notcovered by heater warranty.

SECTION 3.Operation3.1 Controls - General

(see Figures 12 and 13)1. Electronic Ignition Controls:

a. Intermittent Ignition:

Pilots are automatically lit when theoperating control calls for heat (Systems #4and #9). The unit performs its own safetycheck and opens the main valves only afterthe pilot is proven to be lit. Whenever the

pilot flame is interrupted, the main gasvalve closes within 0.8 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:An electronic temperature control is provided onmodel AP boilers to control the pool watertemperature. The temperature sensor (thermistor)is located in the filter circulation piping (seeSection 2.8).

3. Boiler Power (On/Off/Auto) Switch:This provides for constant or automatic pumpoperation.

4. High Limit Controls:The manual reset high limit switch is provided asstandard equipment on all boilers. Thetemperature sensing bulb of the switch is alwayslocated in the heater outlet. Burners willautomatically shut down whenever overheatingof water occurs.

5. Flow Switch:Standard on all AP pool heating boilers. Theswitch is mounted in a tee fitting on the outletheader. This is a paddle type switch which isdeflected by the water flow in the fitting. Anycondition which interrupts or decreases the flow


through the secondary loop will shut down theburners.

6. Low Water Cut Off (optional):The low water cut off automatically shuts offboiler whenever water level in the heatexchanger drops below probe level. It is locatedin the inlet header.

3.2 Initial Start-Up

WARNING

Do not use this appliance if any part has beenunder water. Immediately call a qualifiedservice technician to inspect the heater. thepossible damage to a flooded appliance can beextensive and present numerous safetyhazards. Any appliance that has been underwater must be replaced.

On a newly constructed pool, be sure to run thefilter pump long enough for a complete “turn-over” ofthe pool water before starting heater so that dirt andresidue from construction will have been removed.The filter may clog rapidly during this period, causingsevere cycling of the heater.

1. Before placing the heater in operation, be certainthat the heater is filled with water and that all airis purged from the system. Open all the valves inthe secondary piping.

2. With the filter pump running, run the heaterpump in manual “CONSTANT PUMP” forminimum of 10 minutes and listen for the flowswitch to make as the pump is started. Loosenthe pipe plug on the top of the pump scrollcasting to bleed off any air. NOTE: If the systemwill be operated in a manner that causes air to bedrawn into the heater and the secondary piping,an automatic float type air vent should bepermanently installed on top of the pump scroll.

3. To check the heater firing, proceed as follows:

a. Turn off the power switch.

b. Turn off all manual gas valves and waitfive minutes (Figure 14).

c. Set operating control to the lowest setting.

d. After placing the manual pilot gas valve inthe open position and resetting all safetydevices (high limit, low water cutoff, etc.),the pilot(s) can be lit following theprocedure on the heater rating plate.

e. For standing pilot system, press on pilotrelay knob (see Figure 16), light pilot andkeep relay knob depressed for one minute

then release. Once the pilot is lit, turnpower switch to “AUTO PUMP.”

f. Wait 5 minutes and turn up operatingcontrol until heater fires (for intermittentignition system, the pilot will be ignitedautomatically). The main burners shouldignite smoothly. Turn the operating controlback to the lowest setting.

NOTE: DO NOT OPERATE HEATER UNTILTHE FOLLOWING SAFETY CHECKS HAVEBEEN PERFORMED.

3.3 Safety Shutoff Component Checkout1. Once the pilot(s) is lit and has been established

for five minutes, the flame failure response timeshould be checked as follows:

Systems 4 and 9 - (intermittent ignition). With thissystem pilots are automatically lit when the operatingcontrols call for heat. If the pilot flame fails for anyreason, the main valve is shut off within one secondand the pilot spark ignition is initiated until the pilotflame has been reestablished. This sequence should bechecked by turning off the manual pilot gas valve (seeFigure 15), and, at the same time, monitoring theaudible sparking at the pilot burner and signalinterruption to the 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 standing pilotsystem). Extinguish the pilot flame by placing themanual pilot valve in the closed positions (seeFigure 15), and at the same time, begin recording thetime it takes for the output signal from the electronicignition control to be interrupted. The signalinterruption can be detected either with a test light or avoltmeter. The response time should never exceed onesecond.2. Hi-Limit Checkout. For spas see Section 3.9. The

manual reset high limit is factory preset to 150°F(66°C). Confirm this set point on the unit andadjust if necessary. After running the heater in afiring mode for 10 minutes, slowly close theoutlet valve “A” to raise the outlet temperature asindicated on the outlet thermometer. The highlimit should trip within 2°F (1°C) or 3°F (2°C) ofthe 150°F (66°C) setpoint and shut off theburners. If this does not occur, adjust the setpoint on the unit to shut off the burners when theoutlet thermometer reads 150°F (66°C). Open theoutlet valve “A” and push the reset button. Themain burners should reignite.


3. Flow Switch: See attached vendor literature.4. Low Water Cutoff (optional): See attached

vendor literature.

3.4 Inlet Temperature and TemperatureRise AdjustmentFor proper operation the bypass and outlet valves

must be adjusted to obtain the correct heatertemperature rise and the correct inlet temperature.Please refer to Table 5 which shows these values foreach model. Refer to Section 1.2 and the heaternameplate to determine the model number of yourheater. Inlet and outlet thermometers are provided onthe unit. For spas see Section 3.9.

1. Make sure that the heater has been firing for atleast 10 minutes and that the operating control isset at 5° or 10°F (3° or 6°C) above the pooltemperature.

2. Throttling the OUTLET valve “A” will raise theinlet temperature. Throttling both the OUTLETvalve and the BYPASS valve “B” will increasethe total rise across the heater. Severaladjustments will be necessary to obtain BOTHthe correct temperature rise and the correct inlettemperature. Wait about 5 minutes betweenadjustments for the unit to stabilize.

3. After both temperatures have been set, lock thehandles on the valves or remove the handles toprevent tampering with or accidental changes tothe valve positions.

4. When the pool has reached the desired operatingtemperature check the temperatures again andadjust if necessary. NOTE: The heater outlettemperature should not exceed 140°F (60°C).Reduce heater temp rise if necessary.

POOL OPERATING CONTROL ADJUSTMENT:5. Adjustable Differential Feature: Remove the

cover from the control box and verify that thewhite differential potentiometer is set at about2°F (1°C). NOTE: a 2°F differential means that,if the thermostat is set at 80°F, the heater willcome on at 78°F and go off when the poolreaches 80°F. The 2°F value is a good startingpoint for most installations. This differential maybe adjusted up or down to suit individualapplications.

6. The operating control temperature setting can beadjusted incrementally to obtain the desired pooloperating temperature.

7. An adjustable pump time delay relay is mountedin the control panel (see Figure 12). This relaykeeps the pump running after the burners shutoff. The delay should be set to 5-6 minutes formodels 500-850 and 9-10 minutes for models1010-1825.

Figure 13. Safety Components.

Manual ResetHigh Limit

FlowSwitch

Low WaterCutoff

(Optional)

Part #E21039Part #E131 Indoor

Part #E130 Outdoor

Part #20751

Figure 14. Pilot Burners.

Honeywell(spark ignition, IID)

Honeywell(standing pilot)

Part # W00358 (Nat.)Part # W00344 (Propane)

3.5 Heater Shut Down1. If heater is firing, turn operating control to

lowest value, wait 10 minutes for pump to stoprunning, then turn power switch to off.

2. If heater is not firing, turn power switch to off.

3.6 Spring and Fall OperationStand-by ServiceTurn the thermostat down to approximately

70°F (21°C). This will prevent the pool andsurrounding ground from becoming chilled and alsopermit the pool to be raised to swimming temperaturein a shorter time.

A pool may be maintained at a lower temperaturethan 70°F (21°C) with some increased likelihood ofcondensation and damage to the unit. Models 500through 1010 will maintain an inlet temperature of85°F (29°C) to 90°F (32°C) (if the bypass is properlyadjusted) with a pool temperature of 60°F (16°C).Models 1200 and 1430 can maintain the above with apool temperature of 65°F (18°C). For models 1670and 1825 pool temperature should be maintained at70°F (21°C) or above. See item 3 in the next section.

Part # W00343 (Nat.)Part # W20015 (Propane)

W00365Thermo-couple


Table 5. Temperature Settings.

3.7 Winter OperationComplete Shutdown

1. To shut down the heater for periods of severalmonths or more, turn manual main gas valve andpilot gas valve to "OFF." Where danger offreezing does not exist, some water should flowthrough the heater during the normal filter cycleall year long, even when the heater is turned offor shut down completely, if all bypass valves areopened.

2. If the heater is not protected from freezingtemperatures, it should be completely drainedbefore the first frost. Drain the heater byremoving the drain plug on the bottom of thefront header casting. Leave the plug out untilready to use the heater again. Heater must belevel to permit adequate draining. Whencompressed air is used to blow out lines, it is stillnecessary to follow the above procedure.Keeping the pool heated and the filter pumprunning continuously will not be adequateprotection. If there is a pump failure or anelectrical power failure, the boiler cannot fireand may freeze and be damaged.

3. Improper Use of Heater: The Laars PoolHeating Boiler is not designed for continuous useas an "anti-freezing" device for pools. Operatingthe heater with low water temperatures willcause the fins on the heat exchanger to bepartially blocked with condensation. Incompletecombustion and prolonged operation under theseconditions will result in the heat exchangersooting up. This can seriously damage the heaterand may create a dangerous fire hazard.

3.8 Time Clock OperationDuring the warm-up period, the heater must run

continuously so it can raise the pool temperature fromcold to above 70°F (21°C).

Remove all time clock stops and permit theheater to raise pool temperature to 70°F (21°C) orabove in one continuous operation.

When the time clock stops are replaced, be sureto allow the filter pump and the heater to stay on longenough to keep the pool up to the desired temperature.

3.9 Therapeutic Pools (Spas)Therapeutic pools or "spa" pools are usually

piped and controlled so that very warm or hot water,often with air injection, is forced at high velocity intoa confined area of a swimming pool or into a smallseparate pool. For the purposes of this manual, anyapplication in which the water temperature ismaintained above 85°F (30°C) is considered a spa.SPECIAL SET-UP AND OPERATINGPROCEDURES APPLY TO SPAS.1. Models 1010I and 1010E and larger should not

be used for spas due to their higher temperaturerises.

2. Since outlet temperatures can approach 140°F(60°C) units must be piped in a secondary,parallel loop similar to that shown in Figure 10.The bypass line between the inlet and outlet canbe deleted or, if it is installed, the BYPASS valveshould be closed with the handle removed.

3. To insure that the spa inlet water does not exceed104°F (40°C), the spa filter pump must circulateat the minimum flow rates shown in Table 6.

Boiler Model Minimum Filter Pump Flow Rate

500 220 GPM

600 270 GPM

715 320 GPM

850 380 GPM

Table 6. Minimum Filter Pump Flow Rates For Spas.Note: Maximum Spa Temperature Is

Assumed To Be 100°F (38°C).

4. The high limit stop should be changed to 140°F(60°C). The set point should then be checkedfollowing the procedure in 3C-2.

5. Use the outlet valve “A” to set the temperaturerise as shown in Table 5. Note there should be nobypass piping or flow in these installations.

6. Spas are excellent for relaxation, body-conditioning and for arthritic and rheumaticproblems, but can be hazardous. The ConsumerProduct Safety Commission has recommendedthe following "Safety Rules for Hot Tubs:"a. Spa or hot tub water temperature should

never exceed 104°F (40°C). A temperatureof 100°F (38°C) is considered safe for ahealthy adult. Special caution is suggestedfor young children.

Heater Size Heater Temp. Rise Inlet Temp Difference*Indoor Outdoor (TOUT - TIN) (TINLET - TPOOL)

500 E 14°F 8°C 30°F 17°C500 I 600 E 16°F 9°C 30°F 17°C600 I 715 E 19°F 11°C 30°F 17°C715 I 850 E 23°F 13°C 25°F 14°C850 I 1010 E 26°F 15°C 25°F 14°C

1200 E 30°F 17°C 25°F 14°C1010 I 30°F 17°C 25°F 14°C1200 I 1430 E 35°F 20°C 20°F 11°C1430 I 37°F 21°C 20°F 11°C1670 I 1670 E 38°F 21°C 20°F 11°C1825 I 1825 E 38°F 21°C 20°F 11°C

*ADD this number to pool temperature (TPOOL) to get desired inlettemperature (TINLET). i.e., for 500 E: If pool temperature is 65°F (18°C),inlet thermometer should read 95°F (35°C). Field adjustmenttolerance +_1°F (.5°C).


b. Drinking of alcoholic beverages before orduring spa or hot tub use can causedrowsiness which could lead tounconsciousness and subsequently result indrowning.

c. Pregnant women beware! Soaking in waterabove 102°F (39°C) can cause fetal damageduring the first three months of pregnancy(resulting in the birth of a brain-damaged ordeformed child). Pregnant women shouldstick to the 100°F (38°C) maximum rule.

d. Before entering the spa or hot tub, usersshould check the water temperature with anaccurate thermometer; spa or hot tubthermostats may err in regulating watertemperatures by as much as four degreesFahrenheit (2.2°C).

Figure 16. Pilot Safety Relay.

Pilot ResetSwitch

e. Persons with a medical history of heartdisease, circulatory problems, diabetes orblood pressure problems should obtain theirphysician's advice before using spas or hottubs.

f. Persons taking medications which inducedrowsiness, such as tranquilizers,antihistamines or anticoagulants, should notuse spas or hot tubs.

SECTION 4.Maintenance1. Lubricate the pump seal every 6 months with

½ oz. of SAE 30 non-detergent oil. Slowly addto pump oil cup located on top of the bearingbracket.

2. At start-up and every six (6) months thereafter,the pilot and main burner flame should beobserved for proper performance (see Figure 17).See attached lighting and shut-down instructionsfor proper pilot flame pattern. If flame has theappearance of "sooting" tips, check for debrisnear orifices and call the Laars ServiceDepartment.

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

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

5. Be certain all combustion air and ventilationopenings in the room are unobstructed.

6. 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 daysand 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 with a flashlight bylocating a mirror under the burners. An alternatemethod is to remove the venting and top panelsas necessary to inspect the heat exchanger fromabove. Also check the vent system for defects atthis time. (If cleaning is required, shut off allelectrical and gas supply to the heater.)

7. To expose the heat exchanger:Indoor Models: Remove the flue pipe, top ofunit, rear upper jacket, flue collector rear paneland heat exchanger baffles.

Pilot Relay ManualReset Switch(Standing Pilot Systems) Part # W0030000

Figure 15. Manual Gas Valves.

Pilot Valve

Main Gas Valve

Pilot Valve

Main Gas Valve

ON POSITION

OFF POSITION


Outdoor Models: Remove vent top assembly,rear upper jacket, flue collector rear panel andheat exchanger baffles.

8. To 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 inlet union(s).Remove the four (4) retaining screws. Grasp themanifold pipe and slide out 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.

9. Clean heat exchanger using a wire brush toremove soot and loose scale from the unit. Cleanfallen debris from bottom of heater. Make sureburner ports are clear and pilot assembly is freeof debris.

10. Reassemble in reverse order and be sure the heatexchanger baffles are replaced.

11. The gas and electric controls installed on theheater are engineered for both dependableoperation and long life, but the properfunctioning of these components is necessary forsafe operation of the heater. It is stronglyrecommended that the basic items be checked bya competent serviceman every year and replacedwhen necessary. The basic controls are:

a. Water temperature controls.

b. Pilot safety system.

c. Automatic electric gas valve(s)

d. Flow switch.

12. Low water cutoffs should be inspected every six(6) months, when provided.

NOTE: The warranty does not cover anydamage caused by lack of required maintenanceor improper operating practices.

13. Pool Water Chemistry

The mineral content of the pool water increasesevery day. This is due to the natural evaporationwhich removes only distilled water and leaves theminerals behind. The regular addition of algicidaland sanitizing chemicals also adds greatly to themineral content of the pool. If the concentration ofminerals in the pool is permitted to become too

Figure 17. Main Burner Flame Pattern.

high, the minerals will precipitate out of the waterand deposit onto the walls of the pool, in the filterand in the tubes of the heat exchanger.

For this reason it is very advantageous to drainthe pool regularly (at least every two years). Thisprecautionary measure will save the cost ofexpensive repairs to the finish, filter system andheater.

Another important safety precaution - alwayskeep the pH of the pool water between 7.3 and7.7. This will add years to the life of the poolfinish, filter system and heater.

Most algicidal and sanitizing chemicals containsodium hypochlorite, while others containcalcium hypochlorite. Sodium is not a scalingchemical but calcium is. When using calciumhypochlorite it is especially important tofrequently check the pH of the pool and tochange the pool water when the dissolved solidsindicate an excessive mineral content.

SECTION 5.Troubleshooting

For proper service and problem diagnosis of theheater and heater system, the following tools arerequired:

a. Gas pressure test kit with range from zero to 14W.C. Either a slack tube manometer or anaccurate gas pressure gauge is acceptable withproper adapters to connect to the availablefittings in the line and on the gas valve.

b. Multi-meter with the following ranges:

0 to 500 volts A.C.

0 to 1000 ohms continuity.

0 to 50 millivolts.

c. Tube cleaning kit consisting of reamer, stainlesssteel brush, speed handle and handle extensions.

d. A pool thermometer with a proper range.

e. A pressure gauge with proper range.


1. Symptom: heater is pounding, knocking or emitting steam from relief valvePossible Cause What to Do

A. Low or no water flow A. Is the heater wired into the filter pump circuit so that the heater cannot fire(most likely). unless the pump is running?

Check to see that all valves in system are open to be sure that water cancirculate through the heater.

Check pool filter, clean if clogged.

Examine heater pump for clogged or frozen impeller.

Check flow switch for proper operation and range setting.

B. Debris from system piping B. Remove header covers. Examine all tubes and waterways. Clean out tubes.is blocking tubes. Use new gaskets when reassembling.

C. Scale has formed in tubes C. Clean tubes with tube cleaning kit. Determine hardness. Check water flow, andfrom high mineral content. clean pool filter.

2. Symptom: heater will not fireA. Heater not getting power. A. Check to see that power switch is "ON." Use testing device to trace power to

heater power source. Check fuse and secondary voltage in heater control.

B. Operating or safety control has B. Turn off power. Check continuity across terminals of each operating and safetyopened circuit to electric gas valve. control switch up to the electric gas valve. Replace defective control.

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

D. Manual reset device has tripped. D. Reset pilot safety and all manual reset safety switches. Follow instructions forstart-up.

E. No gas pressure to burners. E. Trace gas line to service shutoff cock. If service cock is open, trace gas line tometer. If no pressure is present at meter, call for public utility service. If gas ispresent in heater inlet, check pressures in following sequence: (1) downstreamfrom pressure regulator; (2) downstream from electric gas valve. Replace oradjust as necessary.

F. Electric gas valve operator is F. Disconnect wiring harness at gas valve terminals. Check continuity of actuatorburned out or shorted. coil. If open circuit or short is indicated, replace coil or operator.

G. Pump does not run. G. Operate in manual. Check power to pump from relay, Check that pump/motor isfree to rotate. Replace relay or motor as necessary.

H. Pump runs, but flow switch H. Check continuity across flow switch. Inspect paddle for proper movement.not closing. Adjust flow range setting.

I. Field interlock open. I. Jumper terminals and isolate problem in other equipment.

3. Symptom: pressure relief valve leaking intermittently or steadilyA. Faulty relief valve. A. Replace with a new relief valve with proper setting (see rating plate).

4. Symptom: soot in flueways or in tubes, or noxious fumes from bad combustionA. Combustion air supply to heater A. Check air supply opening. Look for debris in screen or louvre which covers

room is inadequate. combustion air opening, or for objects blocking the opening.

B. Stack or vent is blocked or restrictive. B. Look for blocked stack and excessive number of elbows in stack or excessivelength of horizontal runs.

C. Severe downdraft is causing C. Check for (1) proper vent cap on stack; (2) adequate height of stack abovespillage of flue products into room. roof; (3) equipment exhausting air from inside of building; and (4) proper

installation of draft diverter.

D. Gas pressure to burners is excessive. D. Check gas pressure with manometer, and adjust with heater firing at full rate.

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

F. Heater installed at high altitude F. Installations at altitudes in excess of 2000 ft. above sea level are subject towithout proper derating. jurisdiction of the local inspection authorities. Check orifice size, contact your

dealer or factory for proper size.

5. Symptom: water dripping in fireboxA. Tube in heat exchanger has A. Tube failure is almost always caused by scale formation in the tube, or

overheated and ruptured. inadequate water flow through the heater.

B. Heater is condensing from low B. Check bypass valve adjustment.inlet temperature.


SECTION 6. Parts Description and Order Numbers

Key

Des

crip

tio

nS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

No

500

600

715

850

1010

1200

1430

1670

1825

Jack

et a

nd

Co

mb

ust

ion

Ch

amb

er C

om

po

nen

ts1

Top

Pan

el A

ssem

bly

1053

5701

1053

5702

1053

5703

1053

5704

1053

5705

1053

5706

1053

5707

1053

5708

1053

5709

2S

pace

r, F

lue

Col

lect

or-

--

1054

0800

1054

0800

1054

0800

1054

0800

1054

0800

1054

0800

3E

nd P

anel

, Flu

e C

olle

ctor

, Lef

t10

5337

0010

5337

0010

5337

0010

5337

0010

5337

0010

5337

0010

5337

0010

5337

0010

5337

004

End

Pan

el, F

lue

Col

lect

or, R

ight

1053

3800

1053

3800

1053

3800

1053

3800

1053

3800

1053

3800

1053

3800

1053

3800

1053

3800

5R

ear

Pan

el, F

lue

Col

lect

or {

Indo

or}

1053

5501

1053

5502

1053

5503

1053

5504

1053

5505

1053

5506

1053

5507

1053

5508

1053

5509

6F

ront

Sup

port

, Flu

e C

olle

ctor

{In

door

}10

5344

0110

5344

0210

5344

0310

5344

0410

5344

0510

5344

0610

5344

0710

6621

0810

6621

097

Tile

Cov

er, F

ront

/Rea

r {I

ndoo

r}10

5342

0110

5342

0210

5342

0310

5342

0410

5342

0510

5342

0610

5342

0710

6615

0810

6615

09(2

)(2

)(2

)(4

)(4

)(4

)(4

)(4

)(4

)8

Tile

Hea

t Shi

eld/

Spa

cer,

1056

0100

--

--

--

--

Fro

nt a

nd R

ear

(2)

9T

ile H

eat S

hiel

d/S

pace

r, F

ront

-10

5479

0110

5479

02-

-10

5479

0310

5479

0110

5479

0410

5479

0310

Tile

Hea

t Shi

eld/

Spa

cer,

Fro

nt-

--

1054

8002

1054

8003

--

-10

5480

0111

Tile

Hea

t Shi

eld/

Spa

cer,

Fro

nt-

--

--

1054

8101

1054

8102

1054

8103

1054

8104

12T

ile H

eat S

hiel

d/S

pace

r, R

ear

-10

5482

0110

5482

02-

-10

5482

0310

5482

0110

5482

0410

5482

0313

Tile

Hea

t Shi

eld/

Spa

cer,

Rea

r-

--

1054

8302

1054

8303

--

-10

5483

0114

Tile

Hea

t Shi

eld/

Spa

cer,

Rea

r-

--

--

1054

8401

1054

8402

1054

8403

1054

8404

15S

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)

16Lo

wer

End

Pan

el/

1054

0701

1054

0701

1054

0701

1054

0701

1054

0701

1054

0701

1054

0701

1054

0701

1054

0701

Hea

t Shi

eld

Wel

dmen

t, R

ight

17Lo

wer

End

Pan

el/

1054

0702

1054

0702

1054

0702

1054

0702

1054

0702

1054

0702

1054

0702

1054

0702

1054

0702

Hea

t Shi

eld

Wel

dmen

t, Le

ft18

Low

er R

ear

Pan

el10

5329

0110

5329

0210

5329

0310

5329

0410

5329

0510

5329

0610

5329

0710

5329

0810

5329

09W

eldm

ent

19M

iddl

e R

ear

Pan

el/

1054

0401

1054

0402

1054

0403

1054

0404

1054

0405

1054

0406

1054

0407

1054

0408

1054

0409

Hea

t Shi

eld

Wel

dmen

t20

End

Pan

el, U

pper

Rig

ht10

5316

0010

5316

0010

5316

0010

5316

0010

5316

0010

5316

0010

5316

0010

5316

0010

5316

0021

End

Pan

el, U

pper

Lef

t10

5340

0010

5340

0010

5340

0010

5340

0010

5340

0010

5340

0010

5340

0010

5340

0010

5340

0022

Upp

er R

ear

Pan

el/

1054

0501

1054

0502

1054

0503

1054

0504

1054

0505

1054

0506

1054

0507

1054

0508

1054

0509

Hea

t Shi

eld

Wel

dmen

t23

Fro

nt P

anel

, Upp

er10

5315

0110

5315

0210

5315

0310

5315

0410

5315

0510

5315

0610

5315

0710

5315

0810

5315

0924

Bra

cket

, 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)

25D

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

0926

Dra

fthoo

d, R

elie

f Baf

fle, L

eft

1054

1001

1054

1002

1054

1003

1054

1004

1054

1005

1054

1006

1054

1007

1054

1008

1054

1009

27Lo

wer

Fro

nt P

anel

/10

5546

0110

5546

0210

5546

0310

5546

0410

5546

0510

5546

0610

5546

0710

5546

0810

5546

09H

eat S

hiel

d W

eldm

ent

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 18. Parts Identification.

LAARS HEATING SYSTEMSK

eyD

escr

ipti

on

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eN

o50

060

071

585

010

1012

0014

3016

7018

25

28M

iddl

e F

ront

Pan

el {

Indo

or}

1055

4401

1055

4402

1055

4403

1055

4404

1055

4405

1055

4406

1055

4407

1066

2008

1066

2009

29S

wee

p S

heet

, Flu

e C

olle

ctor

{In

door

}10

5339

0110

5339

0210

5339

0310

5339

0410

5339

0510

5339

0610

5339

0710

6622

0810

6622

0930

Con

trol

Box

Wel

dmen

t10

5458

0010

5458

0010

5458

0010

5458

0010

5458

0010

5458

0010

5458

0010

5458

0010

5458

0031

Con

trol

Box

Cov

er {

Indo

or}

1054

7200

1054

7200

1054

7200

1054

7200

1054

7200

1054

7200

1054

7200

1054

7200

1054

7200

32B

ase/

Tile

Sup

port

Ass

embl

y {I

ndoo

r}10

5369

0110

5369

0210

5369

0310

5369

0410

5369

0510

5369

0610

5369

0710

5369

0810

5369

0933

Tile

Ass

embl

ies

{R

efer

to

Fig

ure

20

for

con

fig

ura

tio

ns

and

Par

t N

um

ber

s}O

pti

on

al It

ems

Non

-Com

bust

ible

Bas

e {R

ail}

1053

9000

1053

9000

1053

9000

1053

9000

1053

9000

1053

9000

1053

9000

1053

9000

1053

9000

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

Wat

er S

yste

m34

8-T

ube

Ass

embl

y, C

oppe

r T

ubes

/10

5347

0110

5347

0210

5347

0310

5347

0410

5347

0510

5347

0610

5347

07-

-C

ast I

ron

Tub

s {I

ndoo

r}8-

Tub

e A

ssem

bly,

Cop

per

Tub

es/

1054

2901

1054

2902

1054

2903

1054

2904

1054

2905

1054

2906

1054

2907

--

Bro

nze

Tub

s {I

ndoo

r}8-

Tub

e A

ssem

bly,

CU

-NI T

ubes

/10

5536

0110

5536

0210

5536

0310

5536

0410

5536

0510

5536

0610

5536

07-

-C

ast I

ron

Tub

s {I

ndoo

r}8-

Tub

e A

ssem

bly,

CU

-NI T

ubes

/10

5537

0110

5537

0210

5537

0310

5537

0410

5537

0510

5537

0610

5537

07-

-B

ronz

e T

ubs

{Ind

oor}

10-T

ube

Ass

embl

y, C

oppe

r T

ube/

--

--

--

-10

6659

0810

6659

09C

ast I

ron

Tub

s {I

ndoo

r}10

-Tub

e A

ssem

bly,

Cop

per

Tub

e/-

--

--

--

2000

1108

2000

1109

Bro

nze

Tub

s {I

ndoo

r}10

-Tub

e A

ssem

bly,

CU

-NI T

ubes

/-

--

--

--

2000

1008

2000

1009

Cas

t Iro

n T

ubs

{Ind

oor}

10-T

ube

Ass

embl

y, C

U-N

I Tub

es/

--

--

--

-10

6704

0810

6704

09B

ronz

e T

ubs

{Ind

oor}

35B

affle

, Hea

t Exc

hang

er F

ront

/10

5343

0110

5343

0210

5343

0310

5343

0410

5343

0510

5343

0610

5343

0720

0201

0820

0201

09R

ear

{Ind

oor}

(2)

(2)

(2)

(4)

(4)

(4)

(4)

(4)

(4)

36B

affle

, Hea

t Exc

hang

er {

8-T

ube}

1053

4601

1053

4602

1053

4603

1053

4604

1053

4605

1053

4606

1053

4607

--

(7)

(14)

(14)

(14)

(14)

(28)

(28)

--

Baf

fle, H

eat E

xcha

nger

{10

-Tub

e}-

--

--

--

1066

7708

1066

7709

(28)

(14)

Baf

fle, H

eat E

xcha

nger

{10

-Tub

e}-

--

--

--

-10

6677

02(1

4)

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

tio

nS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

No

500

600

715

850

1010

1200

1430

1670

1825

37In

let/O

utle

t Hea

der,

Mac

hine

d10

3645

0010

3645

0010

3645

0010

3645

0010

3645

0010

3645

0010

3645

0010

3645

0010

3645

00[S

0094

300

Gla

ssed

Cas

t Iro

n]In

let/O

utle

t Hea

der,

Mac

hine

d10

3645

0110

3645

0110

3645

0110

3645

0110

3645

0110

3645

0110

3645

0110

3645

0110

3645

01[S

0064

000

Bro

nze]

38F

lang

e, 2

-1/2

" N

PT

Mac

hine

d10

3913

0310

3913

0310

3913

0310

3913

0310

3913

0310

3913

0310

3913

0310

3913

0310

3913

03[S

0063

600

Cas

t Iro

n]F

lang

e, 2

-1/2

" N

PT

Mac

hine

d10

3913

0410

3913

0410

3913

0410

3913

0410

3913

0410

3913

0410

3913

0410

3913

0410

3913

04[S

0064

400

Bro

nze]

39T

ee, M

achi

ned

Fla

nge

2013

0002

2013

0002

2013

0002

2013

0002

2013

0002

2013

0002

2013

0002

2013

0002

2013

0002

[Gla

ssed

Cas

t Iro

n]T

ee, M

achi

ned

Fla

nge

[Bro

nze]

2015

0303

2015

0303

2015

0303

2015

0303

2015

0303

2015

0303

2015

0303

2015

0303

2015

0303

40B

affle

, Wat

er In

let

1033

8300

1033

8300

1033

8300

1033

8300

1033

8300

1033

8300

1033

8300

1033

8300

1033

8300

41B

arrie

r, W

ater

2023

0101

2023

0101

2023

0101

2023

0101

2023

0101

2023

0101

2023

0101

2023

0101

2023

0101

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

42F

lang

e G

aske

tS

0063

700

S00

6370

0S

0063

700

S00

6370

0S

0063

700

S00

6370

0S

0063

700

S00

6370

0S

0063

700

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

43H

eade

r G

aske

t w/B

arrie

rS

0095

100

S00

9510

0S

0095

100

S00

9510

0S

0095

100

S00

9510

0S

0095

100

S00

9510

0S

0095

100

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

44W

ell,

Imm

ersi

onE

2074

000

E20

7400

0E

2074

000

E20

7400

0E

2074

000

E20

7400

0E

2074

000

E20

7400

0E

2740

0045

Wel

l, H

igh

Lim

itE

0025

900

E00

2590

0E

0025

900

E00

2590

0E

0025

900

E00

2590

0E

0025

900

E00

2590

0E

0025

900

46V

alve

, Pre

ssur

e R

elie

fA

0063

300

A00

6330

0A

0063

300

A00

6360

0A

0063

600

A00

6360

0A

0063

600

A00

6360

0A

0063

600

3/4

NP

T 7

5 P

SI

47T

empe

ratu

re G

auge

A20

8950

0A

2089

500

A20

8950

0A

2089

500

A20

8950

0A

2089

500

A20

8950

0A

2089

500

A20

8950

0(2

)(2

)(2

)(2

)(2

)(2

)(2

)(2

)(2

)48

Flo

w S

witc

h {I

ndoo

r}E

0013

100

E00

1310

0E

0013

100

E00

1310

0E

0013

100

E00

1310

0E

0013

100

E00

1310

0E

0013

100

Flo

w S

witc

h {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

049

Pum

p, M

otor

, Im

pelle

rA

2001

800

A20

0180

0A

2001

800

A20

0180

0A

2001

800

A20

0180

0A

2001

800

A20

0180

0A

2001

900

50P

ump

Ada

pter

{G

lass

ed C

ast I

ron}

1036

4200

1036

4200

1036

4200

1036

4200

1036

4200

1036

4200

1036

4200

1036

4200

1036

4200

Pum

p A

dapt

er {

Cas

t Bro

nze}

1036

4201

1036

4201

1036

4201

1036

4201

1036

4201

1036

4201

1036

4201

1036

4201

1036

4201

51P

ump

Hou

sing

{G

lass

ed C

ast I

ron}

1026

1501

1026

1501

1026

1501

1026

1501

1026

1501

1026

1501

1026

1501

1026

1501

1026

1501

Pum

p H

ousi

ng {

Bro

nze}

1048

3301

1048

3301

1048

3301

1048

3301

1048

3301

1048

3301

1048

3301

1048

3301

1048

3301

52B

affle

, Diff

user

1033

8400

1033

8400

1033

8400

1033

8400

1033

8400

1033

8400

1033

8400

1033

8400

1033

8400

53P

ump

Hou

sing

Gas

ket

S00

2460

0S

0024

600

S00

2460

0S

0024

600

S00

2460

0S

0024

600

S00

2460

0S

0024

600

S00

2460

054

Pum

p M

otor

Gas

ket,

A00

2140

0A

0021

400

A00

2140

0A

0021

400

A00

2140

0A

0021

400

A00

2140

0A

0021

400

A00

2140

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

tio

nS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

No

500

600

715

850

1010

1200

1430

1670

1825

Gas

Sys

tem

55B

urne

r T

ray,

IID

, On/

Off,

1055

0601

1055

0602

1055

0603

1055

0604

1055

0605

1055

0606

1055

0607

1055

0608

1055

0609

Sin

gle

Sec

t. M

anifo

ld {

Nat

.}B

urne

r T

ray,

IID

, On/

Off,

2009

7401

2009

7402

2009

7403

2009

7404

2009

7405

2009

7406

2009

7407

2009

7408

2009

7409

Sin

gle

Sec

t. M

anifo

ld {

LP}

Bur

ner

Tra

y, S

t. P

ilot,

On/

Off,

1052

6201

1052

6202

1052

6203

1052

6204

1052

6205

1052

6206

1052

6207

1052

6208

1052

6209

Sin

gle

Sec

t. M

anifo

ld {

Nat

.}B

urne

r T

ray,

St.

Pilo

t, O

n/O

ff,10

5296

0110

5296

0210

5296

0310

5296

0410

5296

0510

5296

0610

5296

0710

5296

0810

5296

09S

ingl

e S

ect.

Man

ifold

{LP

}56

Gas

Man

ifold

Wel

dmen

t10

5259

0110

5259

0210

5259

0310

5259

0410

5259

0510

5259

0610

5259

0710

5259

0810

5259

09{S

ingl

e In

let}

57B

urne

r, M

ain

L005

2300

L005

2300

L005

2300

L005

2300

L005

2300

L005

2300

L005

2300

L005

2300

L005

2300

58P

ilot B

rack

et/B

urne

r W

eldm

ent

1052

9502

1052

9502

1052

9502

1052

9502

1052

9502

1052

9502

1052

9502

1052

9502

1052

9502

{Hon

eyw

ell}

59P

ilot B

urne

r {H

oney

wel

l}W

0035

800

W00

3580

0W

0035

800

W00

3580

0W

0035

800

W00

3580

0W

0035

800

W00

3580

0W

0035

800

Sta

ndin

g P

ilot {

Nat

.}P

ilot B

urne

r {H

oney

wel

l}W

0034

400

W00

3440

0W

0034

400

W00

3440

0W

0034

400

W00

3440

0W

0034

400

W00

3440

0W

0034

400

Sta

ndin

g P

ilot {

LP}

Pilo

t Bur

ner

{Hon

eyw

ell}

W00

3430

0W

0034

300

W00

3430

0W

0034

300

W00

3430

0W

0034

300

W00

3430

0W

0034

300

W00

3430

0IID

Pilo

t {N

at.}

Pilo

t Bur

ner

{Hon

eyw

ell}

W20

0150

0W

2001

500

W20

0150

0W

2001

500

W20

0150

0W

2001

500

W20

0150

0W

2001

500

W20

0150

0IID

Pilo

t {LP

}60

Orif

ice,

Nat

. Gas

- 4

" W

.C.

L005

0700

L005

0700

L005

0700

L005

0700

L005

0700

L005

0700

L005

0700

L005

0700

L005

0700

{Sea

Lev

el}

(22)

(26)

(30)

(36)

(42)

(50)

(60)

(70)

(76)

Orif

ice,

Pro

pane

- 9

" W

.C.

L003

2900

L003

2900

L003

2900

L003

2900

L003

2900

L003

2900

L003

2900

L003

2900

L003

2900

{Sea

Lev

el}

(22)

(26)

(30)

(36)

(42)

(50)

(60)

(70)

(76)

61V

alve

, Man

ual,

Gas

{N

at.}

V00

0420

0V

0004

200

V00

0420

0V

0004

300

V00

0430

0V

0004

300

V00

0430

0V

0004

300

V00

0430

0V

alve

, Man

ual,

Gas

{LP

}V

0004

800

V00

0480

0V

0004

800

V00

0480

0V

0004

200

V00

0420

0V

0004

300

V00

0430

0V

0004

300

62S

afet

y G

as V

alve

, On-

Off

{Nat

.}V

0046

600

V00

4660

0V

0046

600

V00

4660

0V

0046

700

V00

4670

0V

0046

700

V00

4670

0V

0046

800

Saf

ety

Gas

Val

ve, O

n-O

ff {L

P}

V00

4660

0V

0046

600

V00

4660

0V

0046

600

V00

4660

0V

0046

600

V00

4670

0V

0046

700

V00

4670

063

Val

ve, G

as, O

pera

ting/

Reg

.V

0051

200

V00

5120

0V

0051

200

V00

5120

0V

0051

300

V00

5130

0V

0051

300

V00

5140

0V

0051

400

On-

Off

{N

at.}

Val

ve, G

as, O

pera

ting/

Reg

.V

0054

800

V00

5480

0V

0054

800

V00

5480

0V

0054

800

V00

5480

0V

0054

900

V00

5490

0V

0054

900

On-

Off

{LP

}64

Val

ve, P

ilot,

Gas

Man

ual

W00

0210

0W

0002

100

W00

0210

0W

0002

100

W00

0210

0W

0002

100

W00

0210

0W

0002

100

W00

0210

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

tio

nS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

No

500

600

715

850

1010

1200

1430

1670

1825

65M

anifo

ld C

over

Pla

te A

ssem

bly

1055

2901

1055

2902

1055

2903

1055

2904

1055

2905

1055

2906

1055

2907

1055

2908

1055

2909

{Sin

gle

Pilo

t}66

Bur

ner

Ant

i-Rot

atio

n B

rack

et10

5253

0110

5253

0210

5253

0310

5253

0410

5253

0510

5253

0610

5253

0710

5253

0810

5253

09{S

ingl

e P

ilot}

67B

urne

r T

ie D

own

Bra

cket

, Lef

t10

5257

0110

5257

0210

5257

0310

5257

0410

5257

0510

5257

0710

5257

0810

5257

0910

5257

10{S

ingl

e P

ilot}

68B

urne

r T

ie D

own

Bra

cket

, Rig

ht10

5420

0110

5420

0210

5420

0310

5420

0410

5420

0510

5420

0710

5420

0810

5420

0910

5420

10{S

ingl

e P

ilot}

69T

herm

ocou

ple

{Sta

ndin

g P

ilot}

W00

3650

0W

0036

500

W00

3650

0W

0036

500

W00

3650

0W

0036

500

W00

3650

0W

0036

500

W00

3650

070

Pilo

t Sol

enoi

d V

alve

(IID

)W

0019

300W

0019

300

W00

1930

0W

0019

300

W00

1930

0W

0019

300

W00

1930

0W

0019

300

W00

1930

0M

an. R

eset

Pilo

t Rel

ay (

std.

pilo

t)W

0030

000

W00

3000

0W

0030

000

W00

3000

0W

0030

000

W00

3000

0W

0030

000

W00

3000

0W

0030

000

Ele

ctri

cal C

om

po

nen

ts71

Igni

tion

Con

trol

, Ele

ctro

nic,

E01

0090

0E

0100

900

E01

0090

0E

0100

900

E01

0090

0E

0100

900

E01

0090

0E

0100

900

E01

0090

0U

.S. {

Nat

.}Ig

nitio

n C

ontr

ol, E

lec.

Can

./E

2033

900

E20

3390

0E

2033

900

E20

3390

0E

2033

900

E20

3390

0E

2033

900

E20

3390

0E

2033

900

Spa

rk L

P/C

SD

-1 {

100%

Lko

ut}

72T

rans

form

er, 1

15V

/24V

E00

8610

0E

0086

100

E00

8610

0E

0086

100

E00

8610

0E

0086

100

E00

8610

0E

0086

100

E00

8610

073

Sw

itch,

Hig

h Li

mit,

Man

ual R

eset

E21

0390

0E

2103

900

E21

0390

0E

2103

900

E21

0390

0E

2103

900

E21

0390

0E

2103

900

E21

0390

074

Con

trol

ler,

Wat

er T

emp.

E21

0380

0E

2103

800

E21

0380

0E

2103

800

E21

0380

0E

2103

800

E21

0380

0E

2103

800

E21

0380

075

Sen

sor,

Wat

er T

emp.

E21

0360

0E

2103

600

E21

0360

0E

2103

600

E21

0360

0E

2103

600

E21

0360

0E

2103

600

E21

0360

0E

lect

rica

l Co

mp

on

ents

{O

pti

on

al}

M/R

Hig

h G

as P

ress

ure

Sw

itch

E00

2330

0E

0023

300

E00

2330

0E

0023

300

E00

2330

0E

0023

300

E00

2330

0E

0023

300

E00

2330

0M

/R L

ow G

as P

ress

ure

Sw

itch

E00

2350

0E

0023

500

E00

2350

0E

0023

500

E00

2350

0E

0023

500

E00

2350

0E

0023

500

E00

2350

0M

/R L

ow W

ater

Cut

Off

E20

7510

0E

2075

100

E20

7510

0E

2075

100

E20

7510

0E

2075

100

E20

7510

0E

2075

100

E20

7510

0V

ent V

alve

120

Vol

ts {

Sys

tem

4}

V00

1900

0V

0019

000

V00

1900

0V

0019

000

V00

1900

0V

0019

000

V00

1900

0V

0019

000

V00

1900

0V

ent V

alve

24

Vol

ts {

Sys

tem

9, 1

1}V

2000

100

V20

0010

0V

2000

100

V20

0010

0V

2000

100

V20

0010

0V

2000

100

V20

0010

0V

2000

100

Ou

tdo

or

Jack

et, C

om

bu

stio

n C

ham

ber

, Hea

t E

xch

ang

er C

om

po

nen

tsR

efer

To

Fig

ure

19

Fo

r P

lace

men

t5

Rea

r P

anel

, Flu

e C

olle

ctor

{O

utdo

or}

1066

1701

1066

1702

1066

1703

1066

1704

1066

1705

1066

1706

1066

1707

1066

1708

1066

1709

6F

ront

Sup

port

, Flu

e C

olle

ctor

1066

2101

1066

2102

1066

2103

1066

2104

1066

2105

1066

2106

1066

2107

1066

2108

1066

2109

{Out

door

}7

Tile

Cov

er, F

ront

/Rea

r {O

utdo

or}

1066

1501

1066

1502

1066

1503

1066

1504

1066

1505

1066

1506

1066

1507

1066

1508

1066

1509

(2)

(2)

(2)

(4)

(4)

(4)

(4)

(4)

(4)

28M

iddl

e F

ront

Pan

el {

Out

door

}10

6620

0110

6620

0210

6620

0310

6620

0410

6620

0510

6620

0610

6620

0710

6620

0810

6620

0929

Sw

eep

She

et, F

lue

Col

lect

or10

6622

0110

6622

0210

6622

0310

6622

0410

6622

0510

6622

0610

6622

0710

6622

0810

6622

09{O

utdo

or}

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 19. Tile Assemblies.

When ordering tiles: Assembly number isfor all tiles. Part numbers shown for the frontof unit are the same for the rear tiles. Checkdimensions of old tile as shown here toconfirm part number.


Figure 20. Outdoor Parts.

1

2

3

4

5

6

7

8

9

10

1112

14

15

16

17

18

19

13

20

LAARS HEATING SYSTEMSK

eyD

escr

ipti

on

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eN

o50

060

071

585

010

1012

0014

3016

7018

25

31C

ontr

ol B

ox C

over

{O

utdo

or}

1063

0300

1063

0300

1063

0300

1063

0300

1063

0300

1063

0300

1063

0300

1063

0300

1063

0300

32N

on-C

ombu

stib

le B

ase/

Tile

1060

2301

1060

2302

1060

2303

1060

2304

1060

2305

1060

2306

1060

2307

1060

2308

1060

2309

Sup

port

Ass

embl

y {O

utdo

or}

3410

-Tub

e A

ssem

bly,

1066

5901

1066

5902

1066

5903

1066

5904

1066

5905

1066

5906

1066

5907

1066

5908

1066

5909

Cop

per

Tub

e/C

ast I

ron

Tub

s {O

utdo

or}

10-T

ube

Ass

embl

y,20

0011

0120

0011

0220

0011

0320

0011

0420

0011

0520

0011

0620

0011

0720

0011

0820

0011

09C

oppe

r T

ube/

Bro

nze

Tub

s {O

utdo

or}

10-T

ube

Ass

embl

y,20

0010

0120

0010

0220

0010

0320

0010

0420

0010

0520

0010

0620

0010

0720

0010

0820

0010

09C

U-N

I Tub

es/ C

ast I

ron

Tub

s {O

utdo

or}

10-T

ube

Ass

embl

y,10

6704

0110

6704

0210

6704

0310

6704

0410

6704

0510

6704

0610

6704

0710

6704

0810

6704

09C

U-N

I Tub

es/ B

ronz

e T

ubs

{Out

door

}35

Baf

fle, H

eat E

xcha

nger

Fro

nt/R

ear

2002

0101

2002

0102

2002

0103

2002

0104

2002

0105

2002

0106

2002

0107

2002

0108

2002

0109

{Out

door

}(2

)(2

)(2

)(2

)(2

)(2

)(2

)(2

)(2

)36

Baf

fle, H

eat E

xcha

nger

, 10-

Tub

e10

6677

0110

6677

0210

6677

0310

6677

0410

6677

0510

6677

0610

6677

0710

6677

0810

6677

09(7

)(1

4)(1

4)(1

4)(1

4)(2

8)(2

8)(2

8)(1

4)B

affle

, Hea

t Exc

hang

er, 1

0-T

ube

--

--

--

--

1066

7702

(14)

Ref

er T

o F

igu

re 2

1 F

or

Pla

cem

ent

1T

op P

anel

1066

0701

1066

0702

1066

0703

1066

0704

1066

0705

1066

0706

1066

0707

1066

0708

1066

0709

2R

ear

Win

dshi

eld

1065

8101

1065

8102

1065

8103

1065

8104

1065

8105

1065

8106

1065

8107

1065

8108

1065

8109

3U

pper

Rea

r Lo

uver

shi

eld

1065

7101

1065

7102

1065

7103

1065

7104

1065

7105

1065

7106

1065

7107

1065

7108

1065

7109

4U

pper

Rea

r P

anel

1065

8701

1065

8702

1065

8703

1065

8704

1065

8705

1065

8706

1065

8707

1065

8708

1065

8709

5G

ap C

losu

re-S

ide

1066

0200

1066

0200

1066

0200

1066

0200

1066

0200

1066

0200

1066

0200

1066

0200

1066

0200

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

6G

ap C

losu

re-M

iddl

e10

6601

0110

6601

0210

6601

0310

6601

0410

6601

0510

6601

0610

6601

0710

6601

0810

6601

097

Low

er R

ear

Pan

el A

ssem

bly

1066

0501

1066

0502

1066

0503

1066

0504

1066

0505

1066

0506

1066

0507

1066

0508

1066

0509

8R

ear

End

Pan

el L

eft a

nd R

ight

1065

7700

1065

7700

1065

7700

1065

7700

1065

7700

1065

7700

1065

7700

1065

7700

1065

7700

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

(2)

9Lo

wer

Rea

r S

hiel

d-In

ner

1065

9901

1065

9902

1065

9903

1065

9904

1065

9905

1065

9906

1065

9907

1065

9908

1065

9909

10R

ear

Bas

e E

xten

sion

1065

8501

1065

8502

1065

8503

1065

8504

1065

8505

1065

8506

1065

8507

1065

8508

1065

8509

11G

as T

rain

Inte

rfac

e P

late

2005

0200

2005

0200

2005

0200

2005

0200

2005

0200

2005

0200

2005

0200

2005

0200

2005

0200

12Le

ft F

ront

End

Pan

el10

6575

0110

6575

0110

6575

0110

6575

0110

6575

0110

6575

0110

6575

0110

6575

0110

6575

0113

Rig

ht F

ront

End

Pan

el10

6575

0210

6575

0210

6575

0210

6575

0210

6575

0210

6575

0210

6575

0210

6575

0210

6575

0214

Fro

nt B

ase

Ext

ensi

on10

6597

0110

6597

0210

6597

0310

6597

0410

6597

0510

6597

0610

6597

0710

6597

0810

6597

0915

Doo

r P

anel

Wel

dmen

t20

0504

0120

0504

0220

0504

0320

0504

0420

0504

0520

0504

0620

0504

0720

0504

0820

0504

09Le

ft D

oor

Pan

el W

eldm

ent

--

--

2010

0705

2010

0706

2010

0707

2010

0708

2010

0709

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

tio

nS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

Siz

eS

ize

No

500

600

715

850

1010

1200

1430

1670

1825

16F

ront

Win

dshi

eld

1065

9101

1065

9102

1065

9103

1065

9104

1065

9105

1065

9106

1065

9107

1065

9108

1065

9109

17U

pper

Fro

nt P

anel

1065

8901

1065

8902

1065

8903

1065

8904

1065

8905

1065

8906

1065

8907

1065

8908

1065

8909

18F

lue

Pan

el F

ront

1065

9501

1065

9502

1065

9503

1065

9504

1065

9505

1065

9506

1065

9507

1065

9508

1065

9509

19F

lue

Pan

el R

ear

1065

9301

1065

9302

1065

9303

1065

9304

1065

9305

1065

9306

1065

9307

1065

9308

1065

9309

20P

ump

Cov

er A

ssem

bly

2005

0100

2005

0100

2005

0100

2005

0100

2005

0100

2005

0100

2005

0100

2005

0100

2005

0100

Pu

mp

Par

tsP

ump

Cou

pler

Ass

embl

y,A

2010

500

A20

1050

0A

2010

500

A20

1050

0A

2010

500

A20

1050

0A

2010

500

A20

1050

0A

2010

500

Arm

stro

ng 1

050

Pum

p M

odul

e, S

haft

and

Bea

ring,

A20

1010

0A

2010

100

A20

1010

0A

2010

100

A20

1010

0A

2010

100

A20

1010

0A

2010

100

A20

1010

0A

rmst

rong

105

0S

eal K

it, A

rmst

rong

150

A20

1020

0A

2010

200

A20

1020

0A

2010

200

A20

1020

0A

2010

200

A20

1020

0A

2010

200

A20

1020

0Im

pelle

r, A

rmst

rong

105

0, 4

.53"

dia

.A

2010

304

A20

1030

4A

2010

304

A20

1030

4A

2010

304

A20

1030

4A

2010

304

A20

1030

4-

Impe

ller,

Arm

stro

ng 1

050,

4.8

5" d

ia.

--

--

--

--

A20

1030

5

H00

6730

0S

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 0310 Document 3006S

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