Laars Mighty Therm, Installation And Operation Instructions Manual

Page 1: ...njury 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...

Page 2: ...ce Igniter 15 4 1 3 Combustion Air Pressure Switch 15 4 1 4 Operating Controls 15 4 1 5 High Limit Control 15 4 1 6 Flow Switch 16 4 1 7 Low Water Cut Off 16 4 2 Start Up Requirements 16 4 3 Normal Op...

Page 3: ...Canada CAN 1 13149 requirements When required by the authority having jurisdiction the installation must conform to American Society of Mechanical Engineers safety codes for controls and safety devic...

Page 4: ...ANSI standard Z223 1 and any local codes that may be applicable Inadequate combustion air supply may result in incomplete combustion sooting of the heat exchanger and unsafe operation of the boiler 2...

Page 5: ...d have at least a 1 4 6mm rise per foot in the direction of flow A vent connector should be supported for the design and weight of the material used to maintain clearances and prevent physical damage...

Page 6: ...r windows exhaust fans fireplace dampers and any other gas burning appliances to their previous condition of use 7 Any improper operation of the common venting system should be corrected so the instal...

Page 7: ...ler should be in accordance with the latest edition of CSA C22 1 Canadian Electrical Code Part 1 Do not rely on the gas or water piping to ground the metal parts of the boiler Plastic pipe or dielectr...

Page 8: ...lean When manually operating lever water will discharge through the drain line Precautions must be taken to avoid contact with hot water and water damage 3 2 Heating Boiler PH Model 3 2 1 Variable Wat...

Page 9: ...mer Auto Resetting Set at 15 Minute SPDT Suggested Wiring Diagram For Tempering System Water at Changeover From Heating To Cooling Figure 8 Boiler Chiller Installation From Chiller control valve or ot...

Page 10: ...is from the make up water line Reopen make up water valve 13 Check gauge for correct water pressure and also check water level in system If the height indicated above the boiler insures that water is...

Page 11: ...ttings in the loop no smaller than the following Model Pipe Size 500 through 715 2 1 2 1010 through 1825 3 2 Model PW heater is not suitable for heating swimming pools or any other application where t...

Page 12: ...2 Figure 12 Hot Water Supply System with Vertical Tank Figure 13 Hot Water Supply System with Horizontal Tank NOTES Heavy line indicates Heater to Tank Circulating Loop NOTES Heavy line indicates Heat...

Page 13: ...ted to a separate storage vessel a temperature and pressure relief valve must be installed on the storage vessel The temperature and pressure relief valve must be design Figure 14 Hot Water Supply Sys...

Page 14: ...tes and drain valves are accessible 3 Be sure the tank is suitable for the water in the system Some water is corrosive and requires a protected tank with a special lining 4 If the tank is glass lined...

Page 15: ...main gas valve s and goes into lockout 4 1 2 Hot Surface Igniter This is a 120 VAC silicon carbide igniter During ignition cycle the igniter will glow for a few seconds until reaching the proper igni...

Page 16: ...flow 4 1 7 Low Water Cut Off The low water cut off automatically shuts off the heater whenever water level drops below probe The probe is located at the heater water inlet header 4 2 Start Up Require...

Page 17: ...limit is turned back up to its original setting and the hi limit is reset 4 5 Start Up Procedure See Section 4 2 for Startup Requirements WARNING If you do not follow these instructions exactly a fir...

Page 18: ...ontrols 1 Set the temperature controller at the system design temperature 2 For boilers with the temperature controller bulb at the boiler inlet set the high limit 40 F to 50 F above temperature contr...

Page 19: ...cal and gas supply to the heater 2 Remove the screws holding the blower housing cover to expose the blower see Figure 20 3 Remove the air orifice off the blower inlet to inspect the blower wheel Clean...

Page 20: ...or improper operating practices 1 Water temperature controls 2 Ignition control system 3 Air pressure proving switch es 4 Automatic electric and manual gas valve s 5 Water flow sensing safety device 6...

Page 21: ...rature controller is set high enough to call for heat 9 Make sure none of the manual reset controls i e low water cutoff high limit etc have tripped Reset any tripped switches If the pump is circulati...

Page 22: ...LAARS HEATING SYSTEMS Page 22 Figure 21 Troubleshooting Chart...

Page 23: ...ressure reducing valve Look for closed valve water line or a leak in the system C Clogged Y strainer C Remove strainer element and clean screen D Debris from system piping is D Remove header covers Ex...

Page 24: ...LAARS HEATING SYSTEMS Page 24 Figure 22 Parts Identification...

Page 25: ...Rear Panel 10540401 10540403 10540405 10540407 10540409 Heat Shield Weldment 17 End Panel Upper Right 10531600 10531600 10531600 10531600 10531600 18 End Panel Upper Left 10534000 10534000 10534000 10...

Page 26: ...3300 A0063600 A0063600 A0063600 3 4 NPT 75 PSI 125 PSI PW Model A0001200 A0001200 A0001200 A0001200 A0063500 44 M R Low Water Cutoff Switch E2075100 E2075100 E2075100 E2075100 E2075100 45 Pump Motor I...

Page 27: ...e 27 Figure 23 Tile Assemblies When ordering tiles Assembly number is for all tiles Part numbers shown for the front of unit are the same for the rear tiles Check dimensions of old tile as shown here...

Page 28: ...0954500 5 Front Tile Support 10536501 10536503 10536505 10356507 10356509 6 Rear Tile Support 10955101 10955103 10955105 10955107 10955109 7 Rear Base Closure Panel 10950901 10950903 10950905 10950907...

Page 29: ...00 E0015900 E0015900 E0015900 E0015900 4 Controller Water Temp 2 stage E0093200 E0093200 E0093200 E0093200 E0093200 Controller Water Temp on off E0014400 E0014400 E0014400 E0014400 E0014400 5 Terminal...

Page 30: ...e Size Size No 500 715 1010 1430 1825 1 Valve Gas Combination Dual V0077200 V0077200 2 Valve Gas Manual V0004300 V0004300 V0004300 3 Valve Gas Safety V0046700 V0046700 V0046800 4 Valve Gas Combination...

Page 31: ...53901 3 Housing Blower Right 10955901 10955901 10955901 10955901 10955901 Housing Blower Left 10955902 10955902 10955902 10955902 10955902 4 Panel Right Mount Blower 10953401 10953401 10953401 1095340...

Page 32: ...92900 P0092900 P0092900 2 2 2 2 2 17 Grommet Seal E0095500 E0095500 E0095500 E0095500 E0095500 18 Sensor Flame W0041600 W0041600 W0041600 W0041600 W0041600 19 Igniter Hot Surface W0042000 W0042000 W00...

Page 33: ...0657103 10657105 10657107 10657109 4 Upper Rear Panel 10658701 10658703 10658705 10658707 10658709 5 Gap Closure Side 10660200 10660200 10660200 10660200 10660200 2 2 2 2 2 6 Gap Closure Middle 106601...

Page 34: ...Extension 10659701 10659703 10659705 10659707 10659709 14 Door Panel Weldment 20050401 20050403 20050405 20050407 20050409 Door Panel Weldment Left 20100705 20100707 20100709 15 Front Windshield 1065...

Page 35: ...Mighty Therm Lo Nox Page 35...

Page 36: ...805 529 2000 FAX 805 529 5934 20 Industrial Way Rochester NH 03867 603 335 6300 FAX 603 335 3355 480 S Service Road West Oakville Ontario Canada L6K 2H4 905 844 8233 FAX 905 844 2635 www laars com Lit...