LAARS Mighty Therm LO-NOx VW (Sizes 250/400) - Installation, Operation and Maintenance Instructions - Manual (Page 27)

Mighty Therm LO-NOx Volume Water Heater Page 27
5.2.10 Heater Will Not Shut Off
1. If the heater stays on with the brown wire on the
gas valve disconnected, replace the gas valve.
WARNING
Never attempt to repair the gas valve. Such
attempts will void the warranty, and could lead to
dangerous results.
2. Check electrical components for loose wires.
3. Check all wiring connections for correct order of
the components wiring, follow the wiring
diagram provided with the heater.
SECTION 6.
Replacement Parts
6.1 Ordering Information
To order or purchase parts for Laars products,
contact your nearest Laars dealer or distributor. If they
cannot supply you with what you need, contact Laars
Customer Service at the address shown on the back
cover of this manual.
Visit our website at www.laars.com for Service
Center listings.
6.2 Parts List
Key Model Order
No. Description No. Part No.
IGNITER SYSTEM
1 Transformer, 115V/24V 40VA Ignition ..... All E0086100
2 Ignition Control ........................................ All R0328800
3 In-Line Fuse Assembly ............................ All E0228900
4 Hot Surface Ignitor .................................. All R0317200
Key Model Order
Figure 39. Controls Location.
No. Description No. Part No.
MAIN GAS ASSEMBLY
5 Burner Tray Assembly ............................. 250 R0360003
................................................................ 400 R0360005
6 Air Inlet Elbow ......................................... All R0360300
7 Gas Valve ................................................ All R0336800
8 Gas Orifice (set of 8) (Note 1) ................. All R0360100
9 Anti-Rotation Bracket .............................. All R0331800
10 Burner, Main ............................................ All R0360400
11 Gas Pipe with Attachment ....................... All R0360200
12 Flame Sensor .......................................... All R0360900
13 Manifold ................................................... 250 R0365803
................................................................ 400 R0365805
14 Air Inlet Hose ........................................... All R0360600
ELECTRICAL SYSTEM
15 Fusible Link Assembly ............................. All R0361800
16 Fusible Link ............................................. All R0361900
17 Blower ..................................................... All R0360500
18 Air Pressure Switch with Tubing .............. All R0360700
19 Toggle Switch (on/off) (not shown) .......... All E0077000
Toggle switch (EM2) (not shown) ............ All E0109200
20 Hi-Limit, Manual Reset ............................ All E0015900
21 Temp Controller, On/Off ........................... All E0014400
22 Flow Switch ............................................. All E0013000
23 Switch BVSS, Drafthood ......................... 250 E0121000
24 Switch BVSS, Harness ............................ 250 10697802
25 BVSS Adaptor Cable ............................... 250 10887300
26 Top Enclosure ......................................... 250 R0343403
................................................................ 400 R0343405
27 Top Filler Plate ........................................ 250 R0343703
................................................................ 400 R0343705
28 Rainshield Kit .......................................... 250 R0318303
................................................................ 400 R0318305
29 Flue Collector Assembly .......................... 250 R0316403
................................................................ 400 R0316405
30 Outdoor Vent Cap .................................... 250 10561503
................................................................ 400 10561505
31 Indoor Drafthood ..................................... 250 R0368703
................................................................ 400 10561405
32 Flue Transition Plate ............................... 250 10861903
................................................................ 400 10861905
33 Adapter Plate .......................................... 250 10535303
................................................................ 400 10535305
34 Clip .......................................................... All 10211000
35 Flue Collector Hold Down Bracket .......... All 10726200
WATER SYSTEM
36 Heat Exch, Tube Assy, Copper ................ 250 R0095503
................................................................ 400 R0095505
Heat Exch, Tube Assy, Cupronickel ........ 250 R0095603
................................................................ 400 R0095605
37 Plug, 1/4 inch NPT .................................. All P0026800
38 In/Out Header
Cast Iron (S0079200), 2-Pass ................. All 10593800
Bronze (S0075900), 4-Pass .................... All 10546900
39 Return Header
Cast Iron (S0079200), 2-Pass ................. All 10593800
Bronze (S0075900), 4-Pass .................... All 10546800
40 Header Gasket (18) ................................. All R0050800
41 Bolt, Dome Head (8) ............................... All F0046100
42 Screw, Hex Cap (4) ................................. All F0051400
OUT OF
PRODUCTION