LAARS Mighty Therm HH-PH (Sizes 175-400) - Installation, Operation and Maintenance Instructions User Manual
Page 22
LAARS HEATING SYSTEMS
Page 22
8.
Tag and remove all wires from the gas valve
terminals.
9.
Pull the burner tray out of the boiler (see
Figure 32).
NOTE: Due to sharp edges on the metal burners,
wear protective gloves for the next steps.
10. Hold the gas burner or pilot burner firmly, and
push it away from the manifold until it is clear of
the orifice. Slide the burner to be replaced out of
the burner tray (see Figure 32).
11. To replace the gas burner, insert the burner into
the slot at the rear of the burner tray, line it up
with the proper orifice and snap it into position.
12. To replace the pilot burner, install the pilot
assembly on the new pilot burner and install it in
the burner tray.
13. Screw the new gas valve onto the manifold pipe.
Make sure the arrow on the bottom of the gas
valve that indicates the direction of gas flow is in
the proper direction. Also make sure the brass
fitting is on the right side.
14. Connect the pilot gas tube to the pilot assembly
and the gas valve.
15. Slide the burner tray back into the boiler and
fasten it with the two brackets.
16. Install the anti-rotation bracket to the inner panel
and fasten with two screws (see Figure 32).
17. Install the manifold bracket and fasten with
screws.
18. Connect the service union in the gas line, and
screw the main gas pipe to the gas valve (see
Figure 32).
19. Turn ON the gas valve to the boiler following the
lighting instructions found on the inside of the
boiler.
20. Turn on the main gas supply at the manual gas
cock or the gas meter.
21. Check the system for leaks using a soap solution.
22. Reconnect the electrical wires to the gas valve
following the wiring diagram found on the inside
of the boiler.
23. Install the front access door on the boiler.
24. Turn all electrical power to the boiler ON.
SECTION 5.
Parts List for HH and PH Boilers
5A. General Information
To order or purchase parts for the Laars HH-PH
boilers, contact your nearest Laars dealer or
distributor. If they cannot supply you with what you
need, contact:
Laars Customer Service, 6000 Condor Drive,
Moorpark, California, 93021, Telephone (800) 900-
9276, or
20 Industrial Way, Rochester, New Hampshire 03867,
Telephone (603) 335-6300.
In Canada, contact 480S. Service Road,
Oakville, Ontario, Canada L6K 2H4, Telephone (905)
844-8233.
5B. Parts List
Item
Description
Part Number
PILOT GAS SYSTEM
1.
Burner, Pilot Only,
Standing Pilot, Nat. .................................. W0036300
Standing Pilot, Propane ........................... W0036400
2.
Pilot Thermocouple Only ......................... W0036500
3.
Pilot Burner
Electrode Assy., Nat. ............................... W0030600
Electrode Assy., Propane ........................ W0039600
4.
Pilot Bracket Shield ................................. 10461100
5.
Ceramic Insulator Assy. ........................... 10418805
MAIN GAS SYSTEM
6.
Burner Tray Assembly
Nat. IID, On/Off ........................................ 10571802-05
Nat. IID, Mech. Mod. ............................... 10572102-05
Nat. IID, 2-Stage ...................................... 10581802-05
Nat. Standing Pilot, On/Off ...................... 10571602-05
Nat. Standing Pilot, Mech. Mod. .............. 10571902-05
Propane IID, On/Off ................................. 10737502-05
Propane IID, Mech. Mod. ........................ 10737402-05
Propane IID, 2-Stage ............................... 10737302-05
Propane Standing Pilot, On/Off ............... 10571702-05
Propane Standing Pilot, Mech. Mod. ....... 10572002-05
7.
Gas Valve
Nat. IID .................................................... R0099400
Nat. Stdg Pilot, (Model 175) .................... V0058900
Nat. Stdg Pilot, (Model 250) .................... V0073300
Nat. Stdg Pilot, (Model 325-400) ............. V0049900
Propane IID, O/O, MM
(Models 175 thru 400) ............................. V0073600
Propane IID, 2-Stage
(Models 175 thru 250) ............................. V0073100
Propane IID, 2-Stage
(Models 325 and 400) ............................. V0073200
Propane. Standing Pilot ........................... RV0073700
8.
Burner, Main ............................................ RL0052300
9.
Burner, Main w/Pilot Bracket ................... 10457500
10. Orifice, Main Burner, Nat. ........................ L0032200
Orifice, Main Burner, Propane ................. L0032900
11. Burner Tray Weldment ............................ R0099502-05