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 could create carbon monoxide gas in flue gases which could cause serious injury, property damage, or death. Improper installation and/or operation will void the warranty. WARNING If the information in this manual is not followed exactly, a fire or explosion may result causing 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 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'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 gas supplier. H0117400E Installation and Operation Instructions for Mighty Therm Hydronic Boilers Models HH and PH Sizes 500-1825 These instructions are to be stored in the pocket provided on the boiler Installation and Operation Instructions Document 1049E
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Transcript
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.
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.
H01
1740
0E
Installation and OperationInstructions for
Mighty ThermHydronic Boilers
Models HH and PHSizes 500-1825
These instructions are to be stored in the pocket provided on the boiler
Installation and Operation Instructions Document 1049E
Water Systems ............................................. 51F. Freeze Protection ......................................... 5
SECTION 2.Installation2A. Boiler Placement .......................................... 62B. Installation of Indoor Boilers .......................... 62B-1. Combustion Air Supply ................................. 62B-2. Venting ......................................................... 82C. Installation of Outdoor Boilers ....................... 92D. Gas Supply and Piping ................................. 92E. Electrical Wiring .......................................... 102F. Water Piping of System .............................. 112G. Filling Fully-Connected System................... 11
SECTION 3.Operation3A. Controls - General ...................................... 123B. Initial Start-Up ............................................. 133C. To Start Up System .................................... 133D. To Turn Off Boiler ....................................... 143E. To Shut Down System ................................ 14
1A. IntroductionThis manual provides information for the
installation and operation of Laars hydronic boilers. Itis strongly recommended that all application andinstallation procedures be reviewed completely beforeproceeding with the installation. Consult the Laarsfactory, or local factory representative with anyproblems or questions regarding this equipment.Experience has shown that most problems are causedby improper installation not system design.
Some accessory items are shipped in separatepackages. Verify receipt of all items 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.
IMPORTANT WARNING:
The model HH and PH hydronic boilers must beinstalled in accordance with the procedures outlinedin this manual. The warranty does not apply to boilersnot installed or operated in accordance with theseprocedures. Consult local building and safety codesbefore proceeding with work. The installation must
conform to the requirements of the authority havingjurisdiction or, in the absence of such requirements, tothe latest edition of the National Fuel Gas Code;ANSI Z223.1, National Electrical Code ANSI/NFPA70 and/ or in Canada CAN 1 -13149 requirement.
When required by the authority havingjurisdiction, the installation must conform toAmerican Society of Mechanical Engineers safetycodes for controls and safety devices for automaticallyfired boilers No. CSD-1, and in Canada CGA 3.3. Anymodification to the boiler, its gas controls, gasorifices, wiring or draft diverter may void the Laarswarranty. If field conditions require suchmodifications, consult factory.
1B. Boiler IdentificationConsult rating plate on the boiler. The following
example simplifies the boiler identification.
1 2 3 4 5 6PH 1670 I N 09 L
(1) Basic boiler model (see descriptions below).(2) Input rate X 1000 BTU/hr.(3) Indoor (1) or Outdoor (E) installation.(4) Gas type: Natural (N) or Propane (P).(5) Ignition system: I.I.D. (09) or continuous pilot
(16). Special option: I.I.D. (04) 115 volts.(6) Firing modes:
Model HH hydronic heating boilers. There mustbe a field installed pump to circulate water.
Model PH hydronic heating boilers are basicallythe same as the HH models except that the PH boilerscome with integrally mount pumps. Pumps are sizedfor pressure drop through the heat exchanger and shortruns of pipe for primary-secondary systems.
Laars hydronic boilers are available in twoconfigurations: an indoor version and an outdoorversion. Both are available from the factory (seeFigure 1).
1C. Flow RequirementsAll low volume hydronic boilers must have
continuous flow through the heat exchanger for properoperation. The system pump must be capable ofdeveloping sufficient pressure to overcome theFigure 1. Boiler Configuration.
LAARS Heating SystemsPage 4
Design Temperature Rise Across The Boiler
20°F 11°C 25°F 14°C 30°F 17°C 35°F 19°CIndoor Outdoor Flow H/L Flow H/L Flow H/L Flow H/LSizes Sizes GPM l/s Ft. m GPM l/s Ft. m GPM l/s Ft. m GPM l/s Ft. m
resistance of the boiler plus the entire circulatingsystem at the designated GPM (see Table 1). Thetemperature rise across the boiler should never exceed40°F (22°C). Primary-secondary pumping is the mosteffective way to assure proper flow through the boilerresulting in longer boiler life and greater systemefficiency (see Figure 2).
1D. Variable Water Flow SystemsHeating systems using zone valves, zone pumps
or 3-way valves can experience reduced water flowthrough the boiler. This can result in an excessivewater temperature rise and unstable boiler operation.If the system water flow is variable, it must not beallowed to fall below 30% of full flow. The boilermust be equipped with staged or modulated fire withthe temperature sensor installed in the outlet water.State variable flow when ordering. Laars recommendsprimary-secondary pumping for all variable flowsystems. Primary-secondary pumping is mandatoryfor variable flow systems where minimum flows areless than 30% of full flow conditions. The boilerpump in a primary-secondary system maintainsconstant flow through the boiler even though thesystem flow is variable. In a primary-secondarysystem the pressure drop of the boiler is not added tothe system (see Figure 2).
Table 1. Flow Requirements.
A Special Note About 3-Way Water Valves3-way water valves (2 position or proportional)
are sometimes used to divert water around a boilerand control the temperature of water being supplied tothe system. Valves installed in this manner must besupplied with an end switch or some other suitablecontrol to shut off the boiler when the flow is reducedto 30%. The boiler must be supplied with staged ormodulated fire as indicated in Section 1D, VariableWater Flow Systems.
It is often possible to accomplish excellent watertemperature control without 3-way valves throughproper application of staged or modulated firingsystems. Consult the factory or local Laarsrepresentative for assistance with such systems.
System Pressure RequirementsThe model HH and PH boilers are designed to
operate on closed, pressurized systems. A minimum of12 psi should be maintained on the system whereboiler supply water temperatures are 200°F (93°C) orless. If higher temperatures are required, the minimumsystem pressure should be at least 15 psi above thewater vapor pressure corresponding to the elevatedwater temperature.
The hydronic boilers are not suitable for opensystems unless the supply water temperatures are keptbelow 180°F (82°C), and minimum of 5 psi statichead is maintained within the boiler.
Mighty Therm Hydronic Boiler Page 5
1E. Warning Regarding ChilledWater SystemsWhen a boiler is connected to an air
conditioning system where the same water is used forheating and cooling, chilled water must be preventedfrom entering the boiler. When changing such asystem from cooling to heating, the chilled watershould be allowed to circulate through the building(after the chiller has been turned off) for a period long
enough for the water to warm up to at least 70°F(21°C) before the water is allowed to flow into theboiler. It is equally important to prevent hot waterfrom entering the chiller. The system shown in Figure3 is suggested to make sure that the system water isneither too hot nor too cold when a changeover fromheating to cooling, or vice versa, takes place. When aboiler is connected to heating coils located in airhandling units (where they may be exposed torefrigerated air circulation), the boiler piping systemshall be equipped with a flow control valve or otherautomatic means to prevent gravity circulation ofchilled water through the boiler. Chilled water in theboiler will create condensation on the boiler tubeswhich will drip on the burners and may extinguish thepilot.
Boilers installed in violation of either of theabove requirements may void the warranty.
1F. Freeze ProtectionBoiler installations are not recommended in
areas where the danger of freezing exists unlessproper precautions are taken for freeze protection. Thepreferred method of freeze protection is bymaintaining a mixture of no more than 50% properlyinhibited HVAC glycol. This mixture will protect theboiler to temperatures of about -35°F (-37°C). To getthe desired temperature rise across the boiler whenthis mixture is used, increase the water flow by 15%above the original recommendation. Increase the headloss requirement by 20%.
Figure 3. Boiler-Chiller Installation.
Figure 2. Typical Schematic for a Primary-Secondary System.
Suggested Wiring Diagram For Tempering System Waterat Change-over From Heating to Cooling.
LAARS Heating SystemsPage 6
SECTION 2.Installation
2A. Boiler PlacementThe boiler must be placed to provide specific
clearances on all sides for maintenance andinspection. There must also be minimum distancesmaintained from combustible surfaces. Theseclearances also apply to non-combustible materials,because the boiler requires air circulation for properoperation.
Boiler should be mounted on a level surface. Anintegral combustible flooring base is provided asstandard equipment on all outdoor models. Indoormodels can be installed on a combustible floor with aspecial base assembly which is available from thefactory, or with a base that complies with local coderequirements. See rating plate for part number of thebase assembly.
Do not install boiler on carpeting.Under the National Fuel Gas Code, ANSI
Z223.1, it is permissible to place the boiler on floorsother than non-combustible when the installationcomplies with the American Insurance Code. Figures5, 6, 7, and 8 show common installation oncombustible flooring.
2B. Installation of Indoor Boilers1. Locate the boiler to provide adequate
clearance for inspection and service on all sides(see Table 2). We recommend minimums of 24"from front (for proper access to and service ofcontrols) and 18" at water connection end. Foralcove installation, see Figure 9.
2B-1. Combustion Air Supply1. The boiler 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/or inCanada CAN 1 - B1 49 requirements, and anylocal codes that may be applicable. Inadequatecombustion air supply may result in incompletecombustion, sooting of the heat exchanger, andunsafe operation of the boiler.
2. (a.) In the United States, the generalrequirements specify that boiler rooms should beprovided with two permanent air supplyopenings communicating directly through thewall to outside air; one within 12 inches(305mm) of the ceiling, and the other within 12inches (305mm) 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 3 for recommended air supply for eachmodel. An improperly ventilated equipmentroom can get excessively hot and causeaccelerated deterioration of controls andelectrical components.
Clearance Indoor OutdoorFrom inches mm inches mmTop 30 762 unobstructWater Conn. Side 12 305 24 610Opposite Side 6 152 24 610Front Alcove UnobstructRear 8 203 24 610Vent Pipe* 6 152 —Hot Water Pipes Per Code Per Code*1" when using type B Vent (refer to Manufacturer'sInstructions
2. Install the boiler on a waterproof floor with anadequate floor drain and a 6" (152mm)minimum curb on all four sides to protect thebuilding if boiler repairs are required. Themanufacturer will not be held liable for anywater damage in connection with this boiler.
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.
Mighty Therm Hydronic Boiler Page 7
(b.) In Canada, consult local building and safetycodes or, in the absence of such requirements,follow CGA requirements and/or CAN 1 - B149standard. (Table 3 does not apply).
3. Exhaust Fans or Vents: Any equipment whichexhausts air from the boiler room can deplete thecombustion air supply or reverse the naturaldraft action of the venting system.The boiler must be completely isolated and thiscould cause flue products to accumulate in theroom. Additional air must be supplied tocompensate for such exhaust. The information inTable 3 is not applicable in installations whereexhaust fans or blowers of any type are used.Such installations must be designed by qualifiedengineers.
Figure 4. Base for Combustible Floors.
Figure 5. Typical Boiler Installation on Concrete Slab.
Figure 6. Typical Boiler Installation on Raised Platform(Wood).
Figure 7. Typical Boiler Installation on Roof Using a4 x 4 Stringer.
Figure 8. Installation on Concrete Blocks or Tile.
LAARS Heating SystemsPage 8
Figure 9. Alcove Installation.
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 boiler, a suitable switch or equivalent mustbe wired into the boiler control circuit to preventthe boiler from firing unless the blower isoperating.
5. The boiler must be completely isolated andprotected from any source of corrosive chemicalfumes such as trichlorethylene, perchlorethylene,chlorine, etc.
2B-2. Venting1. Laars boilers 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 installedaccording to the latest edition of ANSI Z223.1and/or, in Canada, CAN1-13149 requirementand any local codes 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 boilerdraft hood. The weight of the stack must not reston the boiler. The draft hood and boiler top mustbe easily removable for normal boiler 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 tomaintain clearances and prevent physicaldamage and separation of joints.
4. Avoid ending heater vents near air conditioningor air supply fans. The fans can pick up exhaustflue products from the boiler and return theminside the building, creating a possible healthhazard. A minimum of 4 feet (1.2m) horizontaldistance must be maintained from electricalmeters, gas meters, 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 boiler 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 (4.6m)for every inch of vent diameter. Longer totallengths shown in venting tables are based onmaximum capacity, not condensation factors.
7. When the installation of a draft fan is necessaryin connecting a venting system to a Laars boiler,the installation should be engineered bycompetent personnel following good engineeringpractices. The draft fan supplier should beconsulted for correct size. The installationshould be in accordance with the latest edition ofANSI Z223.1 and/or, in Canada, CAN 1-B149requirement and any local codes havingjurisdiction. When a draft fan is installed, asuitable draft switch must be wired into theboiler control circuit at terminal designated“Field Interlock” to prevent firing of the boilerunless a positive draft has been established.
8. When an existing boiler is removed from acommon venting system, the common ventingsystem is likely to be too large for proper ventingof the appliances remaining connected to it.At the time of removal of an existing boiler, thefollowing steps shall be followed with eachappliance remaining connected to the commonventing system placed in operation, while the
Mighty Therm Hydronic Boiler Page 9
other appliances remaining connected to thecommon venting system are not in operation.(a) Seal any unused openings in the common
venting system.(b) Visually inspect the venting system for
proper size and horizontal pitch anddetermine there is no blockage orrestriction, leakage, corrosion and otherdeficiencies which could cause an unsafecondition.
(c) Insofar as is practical, close all buildingdoors and windows and all doors betweenthe space in which the appliancesremaining connected to the commonventing system are located and other spacesof the building. Turn on clothes dryers andany appliance not connected to the commonventing system. Turn on any exhaust fans,such as range hoods and bathroomexhausts, so they will operate at maximumspeed. Do not operate a summer exhaustfan. Close fireplace dampers.
(d) Place in operation the appliance beinginspected. Follow the lighting instructions.Adjust thermostat so appliance will operatecontinuously.
(e) Test for spillage at the draft hood relief open-ing after 5 minutes of main burner operation.Use the flame of a match or candle, or smokefrom a cigarette, cigar or pipe.
(f) After it has been determined that eachappliance remaining connected to thecommon venting system properly ventswhen tested as outlined above, returndoors, windows, exhaust fans, fireplacedampers and any other gasburningappliance to their previous conditions ofuse.
(g) Any improper operation of the commonventing system should be corrected so theinstallation conforms with the latest editionof the National Fuel Gas Code, ANSIZ223.1. When resizing any portion of thecommon venting system, the commonventing system should be resized toapproach the minimum size as determinedusing the appropriate tables in Appendix Gin the National Fuel Gas Code,ANSI Z223. 1.
2C. Installation of Outdoor Boilers1. Locate the boiler to provide the minimum
clearances as listed in Table 2, “BoilerClearances.” See Service Clearance, 2 B.1.
2. Do not place the boiler in an enclosure or wallrecess. Avoid locations where wind deflection
off structures might cause a down draft. Whensuch wind conditions are possible, place theboiler at least three (3) feet (0.9m) from thestructures.
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 10).
Figure 10. Incorrect Outdoor Installation.
4. Although these models are AGA designedcertified for outdoor installations, suchinstallations are not recommended in areaswhere the danger of freezing exists unless properprecautions are taken for freeze protection.
CautionOutdoor installations are not recommended
in areas where the danger ofsnow blockage exists.
2D. 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 a 2000foot (610m) altitude. Boilers equipped to operateat higher altitudes have appropriate stickers ortags attached.
2. Use the figures in Table 4 to provide adequategas piping from the gas meter to the boiler.
3. A trap (drip leg) must be provided ahead of thegas controls (see Figure 11). A manual gas
LAARS Heating SystemsPage 10
shutoff valve must also be provided for serviceconvenience and safety. Check the local codes.
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. The boilermust be isolated from the gas supply pipingsystem by closing its individual manual gasshutoff valve during any pressure testing of thegas supply piping system at test pressures equalto or less than 1/2 psig.
5. Provide gas supply pressure to the boiler asfollows:
Natural Gas LPG
Min. (inches Per Rating Platewater column)
Max. (inches 9 14water column)
Note: The boiler and all other gas appliancessharing the boiler gas supply line must be firing atmaximum capacity to properly measure the inlet
supply pressure. Low gas pressure could be anindication of an undersized gas meter and/orobstructed gas supply line.6. The correct burner manifold gas pressure is
stamped 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.
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 WiringElectrical diagrams are included with the packet
provided with each unit.
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 Canadian ElectricalCode, CSA C22.1 Part 1. Do not rely on thegas or water piping to ground the metal partsof the heater. Frequently, plastic pipe ordielectric unions isolate the boiler electrically.Service and maintenance personnel who workon or around the boiler may be standing on wetfloors and could be electrocuted by anunderground boiler.
1. Check boiler wiring and pump for correctvoltage, frequency and phase. If the pump circuitis other than 115V, check to see that the boiler isprovided with an appropriate transformer.
2. Wire the boiler and pump exactly as shown inthe wiring diagram supplied with the boiler.
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.
Figure 11. T-Fitting Sediment Trap Installation.
Mighty Therm Hydronic Boiler Page 11
3. The pump and boiler must be electricallyinterlocked so the boiler cannot come on unlessthe pump is running.
4. All field installed electrical safety devices andall field 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 12), 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.
5. Check piping diagrams with local applicableplumbing, heating and building safety codes.
6. A boiler installed above radiation level must beprovided with a low water cutoff device either aspart of the boiler or at the time of boilerinstallation.
7. Install manual and/or automatic bleeding devicesat high points in the system to eliminate air.Install a correctly sized air charger and tankdrainer, as appropriate.
2G. Filling Fully-Connected System1. Close all bleeding devices and open make-up
water valve. Allow system to fill slowly.2. If make-up water pump is employed, adjust
pressure switch on pumping system to provide aminimum of 12 psi at the highest point in theheating loop.
3. If a water pressure regulator is provided on themake-up water line, adjust the pressure regulatorto provide at least 12 psi at the highest point inthe heating loop.
4. Open bleeding devices on all radiation units atthe highest points in the piping throughout thesystem, unless automatic air bleeders areprovided at such points.
5. Run system circulating pump for a minimum of30 minutes with the boiler shut off.
6. Open all strainers in the circulating system andcheck for debris.
7. Recheck all air bleeders as described in Step 4above.
8. Check liquid level in expansion tank. With thesystem full of water and under normal operatingpressure, the level of water in the expansion tankshould not exceed 1/4 of the total, with thebalance filled with air.
9. Start up boiler according to procedure describedin Section 3B. Operate the entire system,including the pump, boiler, and radiation unitsfor one (1) hour.
10. Recheck the water level in the expansion tank. Ifthe water level exceeds 1/4 of the volume of theexpansion tank, open the tank drainer and drainto that level.
11. Shut down the entire system and vent allradiation units and high points in the systempiping as described in Step 4 above.
12. Close make-up water valve and check strainer inpressure reducing valve for sediment or debrisfrom the make-up water line. Reopen make-upwater valve.
Figure 12. Pressure Relief Valve Location.
PressureRelief Valve
Special attention must be given to relief valvesettings in installations where the boiler 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 75 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, waterwill discharge through drain line. Precautionsmust be taken to avoid contact with hot waterand water damage.
4. The weight of all water and gas piping should besupported by suitable hangers or floor stands.
LAARS Heating SystemsPage 12
13. Check gauge for correct water pressure and alsocheck water level in system. If the heightindicated above the boiler insures that water is atthe highest point in the circulating loop, then thesystem is ready for operation.
14. Within three (3) days of start-up, recheck all airbleeders and expansion tank as described inSteps 4 and 8 above.
a. Intermittent Ignition:Pilots are automatically lit when theoperating aquastat calls for heat (System #4and #9) The unit performs its own safetycheck and opens the main valves only afterthe pilot is proven to be lit. Whenever thepilot 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.
Single, two-stage, four-stage or modulatingaquastats are provided in models HH andPH boilers to control the desired servicewater temperature. The temperaturesensing bulb is located in the boiler inlet.
b. Modu-Snap Valves (MechanicalModulation Only):These valves are furnished in addition tothe main electric gas valve. Each valve hasa remote capillary bulb immersed in a wellat the outlet header to maintain a constantoutlet temperature. Consult Table 5 fordesired temperature setting.
3. High Limit Controls:The manual reset high limit switches areprovided as standard equipment on allboilers. Automatic reset switches areoptionally provided. The temperaturesensing bulb of the switch is always locatedin the boiler outlet. Burners willautomatically shut down wheneveroverheating of water occurs.
Mighty Therm Hydronic Boiler Page 13
4. Flow Switch:Standard on all models: Models HH andPH, the switch is mounted in the outlet“tee” connection. The flow switch shutsdown all burners in case of pump failure.
5. Low Water Cut Off (Optional):The low water cut off automatically shutsoff boiler whenever water level dropsbelow probe. Located at boiler inlet (modelPH) and at return header (model HH).
3B. Initial Start-UpLighting: Safe lighting and other performance
criteria were met with the gas manifold and controlassembly provided on the boiler when it underwenttests specified in the ANSI Z21.13 standard.
Before placing the boiler in operation, be certainthat the boiler is filled with water and all air is purgedfrom the system. Once the boiler is connected to thegas supply, the automatic safety shutoff devices mustbe checked.1. Before beginning the tests, make sure the main
manual gas valve, and any other boiler firingvalves are in the “OFF” position.
2. Make sure the boiler’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 followingthe procedure located on the boiler 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), natural
gas only: With this system pilots are automatically litwhen the operating controls call for heat. If the pilotflame fails for any reason, the main valve is shut offwithin one second and the pilot spark ignition isinitiated until the pilot flame has been reestablished.On propane systems, unit locks out for safety. Thissequence should be checked by turning off the manualpilot gas valve, 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 boiler 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 be Figure 14. Gas Manual Valves.
interrupted. 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 main
burners can be achieved by slowly opening themain valve. The result should be a smoothlighting of the main burners.
Hi-Limit Checkout :After running the boiler for a long enough
period, bring the water temperature within the rangeof the hi-limit and slowly back off the high limitsetting until the boiler shuts off. The main burnersshould reignite when the hi-limit is reset and turnedback up to its original setting. The boiler should nowrun until it shuts off automatically on operatingaquastat.
3C. To Start Up System:1. Start Up Boiler
Be certain system pump is running, then proceedas follows:a. Turn off main electrical switch.b. Turn off all manual gas valves and wait
five minutes (see Figure 14).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).
LAARS Heating SystemsPage 14
Figure 16. Main Burner Flame Pattern.
f. Open manual pilot valve. Turn on mainelectrical switch.
g. Set temperature controller to desiredtemperature. Pilot will light automaticallyto ignite main burners whenever theaquastat calls for heat.
h. For standing pilot system, press on pilotrelay knob (see Figure 15), light pilot andkeep relay knob depressed for one minutethen release. Once the pilot is lit, the poweris supplied through the aquastat to the maingas valve.
remove 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 reducing
valve 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 16).See attached lighting and shut-down instructionsfor proper pilot flame pattern). If flame has theappearance of “sooting” tips, check for debrisnear orifices. Call serviceperson.
Figure 15. Pilot Safety Relay.
2. To set the temperature and high-limit controls:a. Set the temperature controller at the system
design temperature.b. Set the high-limit to 40-50°F above
temperature controller setting.c. Models with Mechanical Modulation
Set the temperature controller (Modu-Snapvalve) dial to the desired water temperature(see Table 5).
3. Minimum input rates:The low firing rate setting must be equal to orgreater than the specified minimum input ratingas shown on the appliance rating plate. Laars’boilers use gas valves which are factory set toprovide an input on low fire that meet or exceedthe specified minimum.
3D. To Turn Off Boiler:1. Turn off main electric switch.2. Close all manual gas valves.
3E. To Shut Down System:To shut down boiler, turn off all manual gas
valves and electrical disconnect switches. Wheneverdanger of freezing exists, shut off water supply and
4. Inspect the venting system for obstruction,leakage and corrosion at least once each year.
5. Keep boiler area clear and free from combustiblematerial, gasoline and other flammable vaporsand liquids (see Table 2 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.
Mighty Therm Hydronic Boiler Page 15
a. If cleaning is required, shut off allelectrical 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 exchanger baffles.
Outdoor Models:Remove vent top assembly, rear upper jacket,
flue collector rear panel and heat exchanger baffles.c. Remove all burners:
It is usually more convenient to remove theburner tray assembly. Disconnect sensorwire, ignition cable (or thermocouplegenerator) and pilot gas line. Disconnectmanifold inlet union(s). Remove the four(4) retaining screws. Grasp burner/pilotassembly firmly at the front. Push it back,disengaging it from the gas orifice. Lowerthe 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 from bottomof heater. Make sure burner ports are clear and pilotassembly is free of debris.
d. Reassemble in reverse order: Be sure theheat exchanger baffles are replaced.
8. The gas and electric controls installed on boilersare 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 serviceperson 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 damage
caused 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.
LAARS Heating SystemsPage 16
4. PRESSURE RELIEF VALVES LEAKINGINTERMITTENTLY OR STEADILY.
3. BOILER 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 toboiler junction box.
B. Operating or safety control has B. Turn off power. Use continuityopened circuit to electric across terminals of eachgas valve. operating and safety control
switch up to the electric gasvalve. Replace defectivecontrol.
C. Pilot flame is out. C. Relight pilot per instruction.
D. Manual reset device has tripped. D. Follow instructions for start-up.Reset Pilot safety and allmanual reset safety switchesand reset manual safety gasvalve.
E. No gas pressure to burners. E. Trace gas line to service shutoffcock. If service cock is open,trace gas line to meter. If nopressure is present at meter,call for public utility service. Ifgas is present in boiler inlet,check pressures in followingsequence: (1) downstream frompressure regulator;(2) downstream from electric gasvalve. Replace or adjust asnecessary.
F. Electric gas valve operator is F. Disconnect wiring harness at gasburned out or shortened. valve terminals. Check continuity
to actuator coil. If open circuit orshort is indicated, replace coil oroperator.
Possible Cause What To Do
A. Static pressure in system A. Calculate height of water inexceeds setting of relief valve. system above boiler. Install new
valve with psi setting 25% aboverequired static system workingpressure. Do not exceed 160 psi.
B. Expansion tank is waterlogged B. Drain expansion tank, then(if installed). reopen it to the system. Look for
leaks in expansion tank orfittings. Calculate requiredvolume of expansion tank inrelation to system to determine
that tank is adequate.
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. Strap on digital temperature gauge to checktemperature rise.
2. In addition, the boiler should be equipped with asystem pressure gauge with proper ranges forboiler operation.
Mighty Therm Hydronic Boiler Page 17
5. BOILER IS POUNDING, KNOCKING OR EMITTINGSTEAM FROM RELIEF VALVES.
Possible Cause What To Do
A. Low or no water flow. A. This condition is usuallycaused by lack of adequateflow through boiler.Check the following:(1) Is the boiler wired intothe pump circuit so that theboiler cannot fire unlessthe pump is running?(2) Check to see that allvalves in system are opento be sure that water cancirculate through the boilerand the system.(3) If the system hasautomatic water valves (2-way or 3-way) that can cutoff the water flow throughthe boiler check to seethat they are equipped withend-switches which shutthe boiler down when thewater flow through theboiler is reduced by 70%from full flow.(4) Examine pump forclogged impeller.
B. Low or no system pressure. B. Clean strainer in pressurereducing valve. Look forclosed valve water line ora leak in the system.
C. Clogged "Y" strainer. C. Remove strainer elementand clean screen.
D. Debris from system piping is D. Remove header covers.blocking tubes. Examine all tubes and
waterways. Use newgaskets when reassembling.Clean out tubes.
E. Scale has formed in tubes. E. This is always caused bythe inflow of raw water intothe system. Clean tubeswith tube cleaning kit.Determine hardness.Check for modified flow ifnecessary.
7. WATER DRIPPING IN FIREBOX.
Possible Cause What To Do
6. SOOT IN FLUEWAYS OR IN TUBES,OR NOXIOUS FUMES INDICATIVE
OF BAD COMBUSTION.
Possible Cause What To Do
A. Combustion air supply to A. Check air supply opening.boiler room is inadequate. Look for debris in screen or
louvre which coverscombustion air opening, orfor material blocking theopening.
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 cap onspillage of flue products into stack; (2) adequate height ofroom. stack above roof; (3) equipment
exhausting air from inside ofbuilding; and (4) properinstallation of draft diverter.
D. Gas pressure to burners is D. Check gas presssure withexcessive. Manometer, and adjust
with heater firing at full rate.
E. Boiler not fitted for the fuel E. See nameplate for correctbeing supplied. fuel.
F. Boiler installed at high F. Installations at altitudes inaltitude without proper excess of 2000 ft. abovederating. sea level are subject to
jurisdiction of the localinspection authorities.
Tub in heat exchanger has A tube failure is almost alwaysoverheated and ruptured. caused by (1) scale formation in the
tube or (2) inadequate water flowthrough the boiler.
LAARS Heating SystemsPage 18
Key
Des
crip
tion
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elN
o50
060
071
585
010
1012
0014
3016
7018
25
1To
p P
anel
Ass
embl
y10
5357
0110
5357
0210
5357
0310
5357
0410
5357
0510
5357
0610
5357
0710
5357
0810
5357
09
2Sp
acer
, Flu
e C
olle
ctor
——
1054
0800
1054
0800
1054
0800
1054
0800
1054
0800
1054
0800
3E
nd P
anel
, Flu
e C
olle
ctor
(lef
t)10
5337
0010
5337
0010
5337
0010
5337
0010
5337
0010
5337
0010
5337
0010
5337
0010
5337
00
4E
nd P
anel
, Flu
e C
olle
ctor
(rig
ht)
1053
3800
1053
3800
1053
3800
1053
3800
1053
3800
1053
3800
1053
3800
1053
3800
1053
3800
5R
ear P
anel
, Flu
e C
olle
ctor
1053
5501
1053
5502
1053
5503
1053
5504
1053
5505
1053
5506
1053
5507
1053
5508
1053
5509
6R
ear P
anel
, Ext
., Fl
ue C
olle
ctor
——
——
——
——
——
——
——
——
——
——
——
——
—N
ot R
equi
red—
——
——
——
——
——
——
——
——
——
—
7Fr
ont S
uppo
rt, F
lue
Col
lect
or10
5344
0110
5344
0210
5344
0310
5344
0410
5344
0510
5344
0610
5344
0710
5344
0810
5344
09
8Ti
le C
over
, Fro
nt &
Rea
r10
5342
0110
5342
0210
5342
0310
5342
0410
5342
0510
5342
0610
5342
0710
5342
0810
5342
09(2
)(2
)(2
)(4
)(4
)(4
)(4
)(4
)(4
)
9B
affle
, Hea
t Exc
h. (F
rt &
Rea
r)10
5343
0110
5343
0210
5343
0310
5343
0410
5343
0510
5343
0610
5343
0710
5343
0810
5343
09(2
)(2
)(2
)(4
)(4
)(4
)(4
)(4
)(4
)
10,1
1 B
affle
, Hea
t Exc
hang
er10
5346
0110
5346
0210
5346
0310
5346
0410
5346
0510
5346
0610
5346
0710
5346
0810
5346
01(7
)(1
4)(1
4)(1
4)(1
4)(2
8)(2
8)(2
8)(1
4)—
——
——
——
——
——
——
——
—10
5346
02(1
4)
12R
etur
n H
eade
r (S
-009
81)
1036
4300
1036
4300
1036
4300
1036
4300
1036
4300
1036
4300
1036
4300
1036
4300
1036
4300
Ret
urn
Hea
der (
S00
642)
Bro
nze
1036
4301
1036
4301
1036
4301
1036
4301
1036
4301
1036
4301
1036
4301
1036
4301
1036
4301
13In
let/O
utle
t Hea
der (
S-0
0943
)10
3645
0010
3645
0010
3645
0010
3645
0010
3645
0010
3645
0010
3645
0010
3645
0010
3645
00In
let/O
utle
t Hea
der (
S00
640)
1036
4501
1036
4501
1036
4501
1036
4501
1036
4501
1036
4501
1036
4501
1036
4501
1036
4501
Bro
nze
14Fl
ange
, 2"
(S00
636)
1039
1302
1039
1302
1039
1302
1039
1302
——
——
——
——
——
Flan
ge, 2
1/2
“ (S
0063
5)—
——
——
——
—10
3913
0310
3913
0310
3913
0310
3913
0310
3913
03Fl
ange
, 2 1
/2" (
S00
644)
, Bro
nze
1039
1304
1039
1304
1039
1304
1039
1304
1039
1304
1039
1304
1039
1304
1039
1304
1039
1304
15Fl
ange
Gas
ket
S00
6370
0S
0063
700
S00
6370
0S
0063
700
S00
6370
0S
0063
700
S00
6370
0S
0063
700
S00
6370
0
16H
eade
r Gas
ket w
/Bar
rier
S00
9510
0S
0095
100
S00
9510
0S
0095
100
S00
9510
0S
0095
100
S00
9510
0S
0095
100
S00
9510
0
17H
eade
r Gas
ket
Use
S00
951
00-C
ut O
ut B
arrie
r
18B
affle
, Wat
er In
let
1033
8300
1033
8300
1033
8300
1033
8300
1033
8300
1033
8300
1033
8300
1033
8300
1033
8300
19B
arrie
r, W
ater
1039
7500
1039
7500
1039
7500
1039
7500
1039
7500
1039
7500
1039
7500
1039
7500
1039
7500
20W
ell,
Aqu
asta
tE
0025
900
E00
2590
0E
0025
900
E00
2590
0E
0025
900
E00
2590
0E
0025
900
E00
2590
0E
0025
900
Wel
l, A
quas
tat F
/4 S
tage
E00
8570
0E
0085
700
E00
8570
0E
0085
700
E00
8570
0E
0085
700
E00
8570
0E
0085
700
E00
8570
0
NO
TE: N
umbe
rs in
() r
epre
sent
qua
ntity
requ
ired
for e
ach
size
. Qua
ntity
is o
ne o
ther
wis
e.
SECTION 6. Parts Descriptions and Order Numbers
Mighty Therm Hydronic Boiler Page 19
Figure 19. Parts Identification.
NOTE:Temperature Control Wells -Inlet/Outlet Header1. Firing Mode L, K, & C -
B. Propane Gas Boilers & Heaters500 thru 850 - 2 Dry Wells1010 thru 1852 - 3 Dry Wells
LAARS Heating SystemsPage 20
Key
Des
crip
tion
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elN
o50
060
071
585
010
1012
0014
3016
7018
2521
Tile
, Hea
t Shi
eld/
Spcr
, Frt.
& R
r.10
5601
00—
——
——
——
——
——
——
——
—(2
)
22Ti
le, H
eat S
hiel
d/Sp
acer
, Fro
nt—
—10
5479
0110
5479
02—
——
—10
5479
0310
5479
0110
5479
0410
5479
03
23Ti
le, H
eat S
hiel
d/Sp
acer
, Fro
nt—
——
——
—10
5480
0210
5480
03—
——
——
—10
5480
01
24Ti
le, H
eat S
hiel
d/Sp
acer
, Fro
nt—
——
——
——
——
—10
5481
0110
5481
0210
5481
0310
5481
04
25Ti
le, H
eat S
hiel
d/Sp
acer
, Rea
r—
—10
5482
0110
5482
02—
——
—10
5482
0310
5482
0110
5482
0410
5482
03
26Ti
le, H
eat S
hiel
d/Sp
acer
, Rea
r—
——
——
—10
5483
0210
5483
03—
——
——
—10
5483
01
27Ti
le, H
eat S
hiel
d/Sp
acer
, Rea
r—
——
——
——
——
—10
5484
0110
5484
0210
5484
0310
5484
04
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 Pan
el &
Baf
fleR
ear
Wel
dmen
t10
5329
0110
5329
0210
5329
0310
5329
0410
5329
0510
5329
0610
5329
0710
5329
0810
5329
09
32M
iddl
e R
ear P
anel
/Hea
tS
hiel
d W
eldm
ent
1054
0401
1054
0402
1054
0403
1054
0404
1054
0405
1054
0406
1054
0407
1054
0408
1054
0409
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 Pan
el/H
eat
Shi
eld
Wel
dmen
t10
5405
0110
5405
0210
5405
0310
5405
0410
5405
0510
5405
0610
5405
0710
5405
0810
5405
09
36Fr
ont P
anel
, Upp
er10
5315
0110
5315
0210
5315
0310
5315
0410
5315
0510
5315
0610
5315
0710
5315
0810
5318
09
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 Fr
ont P
anel
1055
4401
1055
4402
1055
4403
1055
4404
1055
4405
1055
4406
1055
4407
1055
4408
1055
4409
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: N
umbe
rs in
() r
epre
sent
qua
ntity
requ
ired
for e
ach
size
. Qua
ntity
is o
ne o
ther
wis
e.
Mighty Therm Hydronic Boiler Page 21
Figure 20. Tile Assemblies.
LAARS Heating SystemsPage 22K
eyD
escr
iptio
nM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
No
500
600
715
850
1010
1200
1430
1670
1825
43Ig
nitio
n C
ontro
l, E
lect
roni
cE
0100
900
E01
0090
0E
0100
900
E01
0090
0E
0100
900
E01
0090
0E
0100
900
E01
0090
0E
0100
900
44Tr
ansf
orm
er, 1
1 5V
/24V
E00
8610
0E
0086
100
E00
8610
0E
0086
100
E00
8610
0E
0086
100
E00
8610
0E
0086
100
E00
8610
045
Con
trol B
ox W
eldm
ent
1054
5800
1054
5800
1054
5800
1054
5800
1054
5800
1054
5800
1054
5800
1054
5800
1054
5800
46C
ontro
l Box
Cov
er10
5472
0010
5472
0010
5472
0010
5472
0010
5472
0010
5472
0010
5472
0010
5472
0010
5472
0047
Win
g N
ut, #
8-32
F003
2100
F003
2100
F003
2100
F003
2100
F003
2100
F003
2100
F003
2100
F003
2100
F003
2100
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
48B
ase
Tile
Sup
port
Ass
y.10
5369
0110
5369
0210
5369
0310
5369
0410
5369
0510
5369
0610
5369
0710
5369
0810
5369
0949
Bur
ner,
Mai
nL0
0523
00L0
0523
00L0
0523
00L0
0523
00L0
0523
00L0
0523
00L0
0523
00L0
0523
00L0
0523
0050
Pilo
t Brk
t/Bur
ner
Wel
dmen
t(J
ohns
on P
ilot)
1052
9501
1052
9501
1052
9501
1052
9501
1052
9501
1052
9501
1052
9501
1052
9501
1052
9501
(Hon
eyw
ell P
ilot)
1052
9502
1052
9502
1052
9502
1052
9502
1052
9502
1052
9502
1052
9502
1052
9502
1052
9502
51P
ilot B
urne
r (Jo
hnso
n)St
andi
ng 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)St
andi
ng P
ilot,
Nat
W00
3580
0W
0035
800
W00
3580
0W
0035
800
W00
3580
0W
0035
800
W00
3580
0W
0035
800
W00
3580
052
Pilo
t Bur
ner (
John
son)
Stan
ding
Pilo
t, P
ropa
neW
0034
600
W00
3460
0W
0034
600
W00
3460
0W
0034
600
W00
3460
0W
0034
600
W00
3460
0W
0034
600
Pilo
t Bur
ner (
Hon
eyw
ell)
Stan
ding
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 (Jo
hnso
n)IID
Pilo
t, N
atW
0034
500
W00
3450
0W
0034
500
W00
3450
0W
0034
500
W00
3450
0W
0034
500
W00
3450
0W
0034
500
Pilo
t Bur
ner (
Hon
eyw
ell)
IID P
ilot,
Nat
W00
3430
0W
0034
300
W00
3430
0W
0034
300
W00
3430
0W
0034
300
W00
3430
0W
0034
300
W00
3430
054
Gas
Man
ifold
Wel
dmen
t (si
ngle
)10
5259
0110
5259
0210
5259
0310
5259
0410
5259
0510
5259
0610
5259
0710
5259
0810
5259
0955
Orif
ice,
Nat
, Gas
L005
0700
L005
0700
L005
0700
L005
0700
L005
0700
L005
0700
L005
0700
L005
0700
L005
0700
(22)
(26)
(30)
(36)
(42)
(50)
(60)
(70)
(76)
56O
rific
e, P
ropa
ne -
9" W
.C.
L003
2900
L003
2900
L003
2900
L003
2900
L003
2900
L003
2900
L003
2900
L003
2900
L003
2900
(22)
(26)
(30)
(36)
(42)
(50)
(60)
(70)
(76)
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
0958
Bur
ner,
Ant
i Rot
atio
n B
rkt (
left)
1052
5301
1052
5302
1052
5303
1052
5304
1052
5305
1052
5306
1052
5307
1052
5308
1052
5309
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 Tie
Dow
n B
rack
et (l
eft)
1052
5701
1052
5702
1052
5703
1052
5704
1052
5705
1052
5702
1052
5703
1052
5704
1052
5704
(2)
(2)
(2)
1052
5705
61B
urne
r Tie
Dow
n B
rack
et (r
ight
)10
5420
0110
5420
0210
5420
0310
5420
0410
5420
0510
5420
0210
5420
0310
5257
0410
5257
04
62Va
lve,
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
63Va
lve,
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: N
umbe
rs in
() r
epre
sent
qua
ntity
requ
ired
for e
ach
size
. Qua
ntity
is o
ne o
ther
wis
e.
Mighty Therm Hydronic Boiler Page 23
Key
Des
crip
tion
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elN
o50
060
071
585
010
1012
0014
3016
7018
2564
Saf
ety
Gas
Val
ve, O
n-O
ff,Tw
o St
age
(Nat
)V
0046
600
V00
4660
0V
0046
00V
0046
00V
0046
700
V00
4670
0V
0046
700
V00
4670
0V
0046
800
65S
afet
y G
as V
alve
, On-
Off,
Two
Stag
e (P
ro)
V00
4660
0V
0046
600
V00
4660
0V
0046
600
V00
4660
0V
0046
600
V00
4670
0V
0046
700
V00
4670
0
66Va
lve,
Gas
, Ope
ratin
g / R
eg.
On-
Off,
Tw
o St
age
(Nat
)V
0051
200
V00
5120
0V
0051
200
V00
5120
0V
0051
300
V00
5130
0V
0051
300
V00
5140
0V
0051
400
67Va
lve,
Gas
, Ope
ratin
g / O
n-O
ffTw
o St
age
(Pro
)V
0054
800
V00
5480
0V
0054
800
V00
5480
0V
0054
800
V00
5480
0V
0054
900
V00
5490
0V
0054
900
68Va
lve,
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
" - 1
3 x
4 1/
2"F0
0287
00F0
0287
00F0
0287
00F0
0287
00F0
0287
00F0
0287
00F0
0287
00F0
0287
00F0
0287
00
72S
crew
, Cap
, 1/2
" - 1
3 x
2 1/
4"F0
0231
00F0
0231
00F0
0231
00F0
0231
00F0
0231
00F0
0231
00F0
0231
00F0
0231
00F0
0231
00
73S
crew
, Cap
, 1/2
" - 1
3 x
1 1/
2"F0
0133
00F0
0133
00F0
0133
00F0
0133
00F0
0133
00F0
0133
00F0
0133
00F0
0133
00F0
0133
00
74W
ashe
rF0
0114
00F0
0114
00F0
0114
00F0
0114
00F0
0114
00F0
0114
00F0
0114
00F0
0114
00F0
0114
00
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
" NP
TP
0026
900
P00
2690
0P
0026
900
P00
2690
0P
0026
900
P00
2690
0P
0026
900
P00
2690
0P
0026
900
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
" -75
PSI
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
80Fl
ow S
witc
h (in
door
)E
0013
100
E00
1310
0E
0013
100
E00
1310
0E
0013
100
E00
1310
0E
0013
100
E00
1310
0E
0013
100
(out
door
)E
0013
000
E00
1300
0E
0013
000
E00
1300
0E
0013
000
E00
1300
0E
0013
000
E00
1300
0E
0013
000
81N
ippl
e, 2
" x c
l. - G
aIv
P00
3850
0P
0038
500
P00
3850
0P
0038
500
——
——
——
——
——
——
——
——
——
——
82N
ippl
e, 2
1/2
" x 3
" GaI
v—
——
——
——
——
——
——
——
—P
0022
000
P00
2200
0P
0022
000
P00
2200
0P
0022
00
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 Fo
r Pum
p R
equi
rem
ents
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/
4F0
0092
00F0
0092
00F0
0092
00F0
0092
00F0
0092
00F0
0092
00F0
0092
00F0
0092
00F0
0092
0
NO
TE: N
umbe
rs in
() r
epre
sent
qua
ntity
requ
ired
for e
ach
size
. Qua
ntity
is o
ne o
ther
wis
e.
LAARS Heating SystemsPage 24K
eyD
escr
iptio
nM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
No
500
600
715
850
1010
1200
1430
1670
1825
89P
lug,
3/4
, Sq.
Hd.
P00
2700
0P
0027
000
P00
2700
0P
0027
000
P00
2700
0P
0027
000
P00
2700
0P
0027
000
P00
2700
090
Pip
e E
xten
sion
1/2
" Fem
ale
Pip
e E
xten
sion
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 (N
at)
1055
0601
1055
0602
1055
0603
1055
0604
1055
0605
1055
0606
1055
0607
1055
0608
1055
0609
93B
urne
r Tra
y, S
t. P
ilot,
2 St
age,
SG
L, S
ect.
Man
ifold
(Pro
)10
5296
0110
5296
0210
5296
0310
5296
0410
5296
0510
5296
0610
5296
0710
5296
0810
5296
0994
Bur
ner T
ray,
I I D
, 4 S
tage
,Sp
lit M
anifo
ld (N
at)
1055
0701
1055
0702
1055
0703
1055
0704
1055
0705
1055
0706
1055
0707
1055
0708
1055
0709
95B
urne
r Tra
y, S
t. P
ilot,
4 St
age,
Split
Man
ifold
(Pro
)10
5503
0110
5503
0210
5503
0310
5503
0410
5503
0510
5503
0610
3303
0710
3305
0810
3305
0996
Bur
ner T
ray,
IID
, Mec
h. M
od.
Split
Man
ifold
(Nat
)10
5507
0110
5507
0210
5507
0310
5507
04—
——
——
——
——
—97
Bur
ner T
ray,
I I D
, Mec
h. M
od.,
3 &
4 S
ect.
Man
ifold
(Nat
)—
——
——
——
—10
5512
0110
5512
0210
5512
0310
5512
0410
5512
0598
Bur
ner T
ray,
St.
Pl.
Mec
h.M
od. S
pIt.
Man
ifold
(Pro
)10
5503
0110
5503
0210
5503
0310
5503
04—
——
——
——
——
—99
Bur
ner T
ray,
St.
Pl.,
Mec
h.M
od.,
3 S
ect.
Man
ifold
(Pro
)—
——
——
——
—10
5505
0110
5505
0210
5505
0310
5505
0410
5505
0510
0C
ombi
natio
n G
as V
alve
,V
0059
600
V00
5960
0V
0059
600
V00
7040
0V
0070
400
V00
7040
0—
——
——
—4
Stag
e, (N
at)
(2)
(2)
(2)
(2)
(2)
(2)
101
Saf
ety
Gas
Val
ve, 4
Sta
ge (N
at)
——
——
——
——
——
——
V00
4670
0V
0046
800
V00
4680
010
2O
pera
ting/
Reg
. Gas
Val
ve,
4 St
age
(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
Stag
e, (P
ro)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
104
Saf
ety
Gas
Val
ve,
4 St
age,
(Pro
)—
——
——
——
——
——
——
—V
0046
700
V00
4670
010
5O
pera
ting/
Reg
. Gas
Val
ve,
4 St
age
(Pro
——
——
——
——
——
——
——
V00
5490
0V
0054
900
(2)
(2)
106
Mod
usna
p G
as V
alve
, (H
H &
PHV
0045
100
V00
4510
0V
0045
100
V00
4510
0—
——
——
——
——
—O
nly)
, Mec
h. M
od. (
Nat
& P
ro)
V00
7110
0V
0071
100
V00
7110
0V
0071
100
V00
7110
0V
0071
100
V00
7110
0V
0071
100
V00
7110
0(3
)(3
)(3
)N
(4) &
P(3
)N
(4) &
P(3
)10
7O
pera
ting/
Reg
. Gas
Val
ve,
Mec
h. M
od. (
Nat
)V
0047
600
V00
4760
0V
0047
600
V00
4760
0V
0047
700
V00
4770
0V
0047
700
V00
4780
0V
0047
800
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
OTE
: Num
bers
in (
) rep
rese
nt q
uant
ity re
quire
d fo
r eac
h si
ze. Q
uant
ity is
one
oth
erw
ise.
Mighty Therm Hydronic Boiler Page 25
Figure 21. Outdoor Parts.
LAARS Heating SystemsPage 26K
eyD
escr
iptio
nM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
No
500
600
715
850
1010
1200
1430
1670
1825
1To
p P
anel
Ass
embl
y10
6607
0110
6607
0210
6607
0310
6607
0410
6607
0510
6607
0610
6607
0710
6607
0810
6607
09
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 Lou
ver S
hiel
d10
6571
0110
6571
0210
6571
0310
6571
0410
6571
0510
6571
0610
6571
0710
6571
0810
6571
09
4R
ear P
anel
Upp
er10
6587
0110
6587
0210
6587
0310
6587
0410
6587
0510
6587
0610
6587
0710
6587
0810
6587
09
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
0010
6601
0010
6601
0010
6601
0010
6601
0010
6601
0010
6601
0010
6601
0010
6601
00
7Lo
wer
Rea
r 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 E
nd P
anel
Lft.
& R
t.10
6577
0010
6577
0010
6577
00(2
)10
6577
0010
6577
0010
6577
0010
6577
0010
6577
0010
6577
00(2
)(2
)(2
)(2
)(2
)(2
)(2
)(2
)(2
)
9Lo
wer
Rea
r Shi
eld
Inne
r10
6599
0110
6599
0210
6599
0310
6599
0410
6599
0510
6599
0610
6599
0710
6599
0810
6599
09
10R
ear B
ase
Ext
ensi
on10
6585
0110
6585
0210
6585
0310
6585
0410
6585
0510
6585
0610
6585
0710
6585
0810
6585
09
11G
as T
rain
Inte
rface
Pla
te20
0502
0020
0502
0020
0502
0020
0502
0020
0502
0020
0502
0020
0502
0020
0502
0020
0502
00
12Fr
ont E
nd P
anel
1065
7500
1065
7500
1065
7500
1065
7500
1065
7500
1065
7500
1065
7500
1065
7500
1065
7500
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
(2)
13Fr
ont B
ase
Ext
ensi
on10
6597
0110
6597
0210
6597
0310
6597
0410
6597
0510
6597
0610
6597
0710
6597
0810
6597
09
14D
oor
1066
0801
1066
0802
1066
0803
1066
0804
1066
0805
1066
0806
1066
0807
1066
0808
1066
0809
(2)
(2)
(2)
(2)
(2)
15Fr
ont
Win
dshi
eld
1065
9101
1065
9102
1065
9103
1065
9104
1065
9105
1065
9106
1065
9107
1065
9108
1065
9109
16Fr
ont P
anel
Upp
er10
6589
0110
6589
0210
6589
0310
6589
0410
6589
0510
6589
0610
6589
0710
6589
0810
6589
09
17Fl
ue P
anel
Fro
nt10
6595
0110
6595
0210
6595
0310
6595
0410
6595
0510
6595
0610
6595
0710
6595
0810
6595
09
18Fl
ue P
anel
Rea
r10
6593
0110
6593
0210
6593
0310
6593
0410
6593
0510
6593
0610
6593
0710
6593
0810
6593
09
19R
ain
Shi
eld-
Con
trol B
ox10
6604
0010
6604
0010
6604
0010
6604
0010
6604
0010
6604
0010
6604
0010
6604
0010
6604
00(N
ot s
how
n)
NO
TE: N
umbe
rs in
() r
epre
sent
qua
ntity
requ
ired
for e
ach
size
. Qua
ntity
is o
ne o
ther
wis
e.
SECTION 7. Outdoor Parts Descriptions and Order Numbers
Mighty Therm Hydronic Boiler Page 27
Key
Des
crip
tion
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elM
odel
Mod
elN
o50
060
071
585
010
1012
0014
3016
7018
25
See
Part
s Ill
ustr
atio
n O
n Pa
ge 2
1
5R
ear P
anel
, Flu
e C
olle
ctor
1066
1701
1066
1702
1066
1703
1066
1704
1066
1705
1066
1706
1066
1707
1066
1708
1066
1709
6R
ear P
anel
, Flu
e C
olle
ctor
Ext
.10
6618
0110
6618
0210
6618
0310
6618
0410
6618
0510
6618
0610
6618
0710
6618
0810
6618
09
7Fr
ont S
uppo
rt, F
lue
Col
lect
or10
6621
0110
6621
0210
6621
0310
6621
0410
6621
0510
6621
0610
6621
0710
6621
0810
6621
09
8Ti
le C
over
, Fro
nt &
Rea
r10
6615
0110
6615
0210
6615
0310
6615
0410
6615
0510
6615
0610
6615
0710
6615
0810
6615
09(2
)(2
)(2
)(4
)(4
)(4
)(4
)(4
)(4
)
10B
affle
, Hea
t Exc
hang
er10
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)
41M
iddl
e Fr
ont P
anel
1066
2001
1066
2002
1066
2003
1066
2004
1066
2005
1066
2006
1066
2007
1066
2008
1066
2009
42S
wee
p S
heet
Flu
e10
6622
0110
6622
0210
6622
0310
6622
0410
6622
0510
6622
0610
6622
0710
6622
0810
6622
09C
olle
ctor
48B
ase
Tile
Sup
port
1060
2301
1060
2302
1060
2303
1060
2304
1060
2305
1060
2306
1060
2307
1060
2308
1060
2309
69Tu
be A
ssem
bly,
Cop
per
1066
5901
1066
5902
1066
5903
1066
5904
1066
5905
1066
5906
1066
5907
1066
5908
1066
5909
70Tu
be A
ssem
bly,
Cup
ro-N
icke
l10
6704
0110
6704
0210
6704
0310
6704
0410
6704
0510
6704
0610
6704
0710
6704
0810
6704
09
NO
TE: N
umbe
rs in
() r
epre
sent
qua
ntity
requ
ired
for e
ach
size
. Qua
ntity
is o
ne o
ther
wis
e.
Pump Rotating Sections and Repair Parts
Electrical OptionsAutomatic Reset Temp. Limit Switch .......................................................................................................................E0014400Manual Reset High Gas Pressure Switch ...............................................................................................................E0023300Manual Reset Low Gas Pressure Switch ................................................................................................................E0023500Outdoor Reset, On/Off 1:1 Reset Ratio ..................................................................................................................E0067600Outdoor Reset, Two Stage, 1:1 Reset Ratio ...........................................................................................................E0084200Outdoor Reset, Two Stage, 1:1.5 Reset Ratio ........................................................................................................E0081900Low-water Cut-off, Electronic, Manual Reset ..........................................................................................................E2075100
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.
Energy Management Monitor (EM2)STANDARD COMPONENTS
Description Part No.On/Off Auto Switch E0109200Time Delay Relay, 24 VAC E2077700
OPTIONAL EQUIPMENTDescription Part No.Remote Aquastat, 110-240F E0014400Immersion Well E0025900Note: The Remote Aquastat and the Immersion Well, whenrequired, should be ordered separately.
SECTION 8. Optional Parts Descriptions and Order Numbers
H011
7400
E
Standard PH Model Pumps (Armstrong 1050)PH Model Part Number Description
500-850 A2000700 1/3 hP with 3-1/2" Impeller
1010-1200 A2000800 1/2 hP with 4-1/4" Impeller
1430-1670 A2000900 3/4 hP with 5-1/4" Impeller
Optional PH Model Pumps (B&G 1522)PH Model Part Number Description
500-715 A0048600 1/4 hP with 3-1/2" Impeller
850-1010 A0047100 1/3 hP with 4" Impeller
1200-1825 A0047300 3/4 hP with 5-1/4" Impeller
Standard Pump Replacement Parts(for standard Armstrong 1050 pumps only)Description Part Number