Out of production – LAARS Mighty Max VW (Sizes 320M - 400M) - Installation, Operation and Maintenance Instructions User Manual
Page 27
Mighty Max Volume Water Heater
Page 27
5.3.2 Electrical Troubleshooting
Troubleshooting procedures should only be
performed by professional service technicians
qualified in heater maintenance.
Some electrical components are wired in parallel,
so it is necessary to troubleshoot in the order that they
appear on the wiring diagram or the troubleshooting
flow chart (see Figure 19).
The following steps should be used when
troubleshooting the heater:
1.
Remove the lower front panel (see Figure 20).
2.
Turn the manual gas valve on the heater off.
3.
If the heater has locked out turn the toggle switch
off for 5 seconds then back on to reset the heater.
4.
Use the troubleshooting flow chart (Figure 19) 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 heater on and
fire the heater.
CAUTION
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
ATTENTION
Au moment de l’entretien des commandes, mettez
des étiquettes sur tous les fils avant de les
débrancher. Des erreurs de câblage peuvent
causer un fonctionnement inadéquat et dangereux.
Vérifier que tout fonctionne bien après votre
entretien.
SECTION 6.
Parts List for Mighty Max VW Heater
6.1 General Information
To order or purchase parts for the Laars Mighty
Max VW heater, contact your nearest Laars contractor
or distributor. If they cannot supply you with what
you need, contact:
Customer Service Department
Laars Heating Systems
6000 Condor Drive
Moorpark, California, 93021
Telephone (805) 529-2000
In Canada, contact:
Customer Service Department
Laars Heating Systems
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 520M 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
OUT OF
PRODUCTION