LAARS Mighty Max HH (Sizes 320M - 400M) - Installation, Operation and Maintenance Instructions - Manual (Page 28)

Page 28
LAARS Heating Systems
4. Use the troubleshooting flow chart (see Figure
20) to determine what components and wiring
should be tested first.
5. Test each component by checking for 24 Vac or
120 Vac entering and exiting the device. If there
is voltage entering the safety device, but none
leaving then there is an open circuit and it must
be determined why it is open. When testing
components between “MV1” of the ignition
control and the gas valve install a meter and let
the heater cycle through one complete sequence
of operation. During the sequence of operation
these safeties will only be energized for the
seven second trial for ignition.
6. Turn the manual gas valve on the boiler on and
fire the boiler.
SECTION 6.
Parts List for Mighty Max HH Boiler
6.1 General Information
To order or purchase parts for the Laars Mighty
Max HH boiler, contact your nearest Laars contractor
or distributor. If they cannot supply you with what
you need, contact:
Laars Customer Service Department
6000 Condor Drive
Moorpark, California 93021
Telephone (805) 529-2000
Telephone (800) 900-9276
In Canada, contact:
Laars Customer Service Department
480 S. Service Road West
Oakville, Ontario, Canada L6K 2H4
Telephone (905) 844-8233.
Item Description Part Number
1. Base Assembly
320M ........................................................... 20157801
400M ........................................................... 20157802
2. Burner and Burner Plenum Weldment
320M ........................................................... 20268401
400M ........................................................... 20268402
3. Venturi Assembly
320M ........................................................... 20158601
400M ........................................................... 20158602
4. Combustion Chamber Weldment
320M ........................................................... 20159101
400M ........................................................... 20159102
5. Gas Train Assembly
320M ........................................................... 20254901
400M ........................................................... 20254902
Gas Valve
320M, 400M ................................................ V2003900
Orifice Holder
320M, 400M ................................................ P2017500
6. Motor, Blower
320M thru 400M Nat. & Prop. Gas ............. A2088100
7. Electrical Controls
High limit Control ........................................... E0015900
Toggle Switch ................................................. E0109200
Indicator Light ................................................ E0071300
Fusible Link ................................................... E0099403
Transformer ................................................... E0086100
Fuse Holder ................................................... E2000300
Fuse, 2 Amp .................................................. E2043600
Flow Switch .................................................... E0013000
Burner Temperature Switch ........................... E2076100
Low Water Cutoff ........................................... E2075100
Pump Time Delay .......................................... E2077700
8. Sight Glass .................................................... F0044800
9. Igniter, Hot Surface ....................................... W0038001
10. Gasket, Igniter Hot Surface ........................... 20409800
11. Control, Remote Ignition ................................ E2101300
12. Control, Temperature ..................................... E2101400
13. Display, Temperature ..................................... E2101600
15. Heat Exchanger Assy., 4 pass, Copper Tubes
320M ........................................................... 20259601
400M ........................................................... 20259602
Heat Exchanger Assy., 4 pass, Cupronickel tubes
320M ........................................................... 20104701
400M ........................................................... 20104702
16. Cover, Machined In/Out ................................. 20150200
17. Plate, Mach. Adapter
320M, 400M ................................................ 20150302
18. Flange, Machined
320M, 400M ................................................ 20255400
19. Cover, Machined Rear ................................... 20150100
20. Pressure Switch, Differential 320-775 ........... E0115200
Pressure Switch, Differential 1000 ................. E0161400
21. Flue Collector Assembly (with gaskets)
320M ........................................................... 20155401
400M ........................................................... 20155402
Figure 21. Lower Front Panel Removal.
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PRODUCTION