Troubleshooting; Gas Control Valve; Pilot Burner Adjustment - Montigo HW38DF Operation Manual

Gas Control Valve

Pilot Adjustment Screw
Inlet
Pressure Manifold Pressure
Test Connection
Figure 33. Sit Nova 820 gas valve.

Pilot Burner Adjustment

1. Locate Pilot Adjustment Screw. (See figure 34.)
2. Adjust pilot screw to provide properly sized flame as shown in
figure 34).
3. After installing or servicing, leak test with a soap solution with
main burner on. Coat pipe and tubing joints, gasket etc. with soap
solution. Bubbles indicate leaks. Tighten any areas where the
bubbles appear until the bubbling stops completely.
Figure 34. Pilot Burner.

Troubleshooting

The following is a troubleshooting chart of possible problems:
PROBLEM
Noisy Pilot Flame
Pilot won't ignite
Main burner will
not light
Part No. XG0190 - 071409
Maintenance
Power
Generator
Wall Switch
Spill Switch
HW38-DF
CORRECTIVE ACTION
Locate pilot adjustment screw on
gas control valve. Flame is decreased by
turning adjustment screw clockwise.
Disconnect remote wires and try to
light pilot. If pilot now works, remote
connections are faulty. Check wiring
diagram figure 30.
1. Check wiring (see figure 30).
2. Check wall switch for proper
connection.
Troubleshooting
HONEYWELL SV9500 /9600
Troublshooting Sequence
NOTE:
Before Troubleshooting, Familiarize Yourself With
The Startup And Checkout Procedure.
START
CHECK:
- Turn Gas Supply Off
- Line voltage power
- Set thermostat to
- Low voltage transformer
call for heat
- Limit Controller
- Thermostat
SV9500 / SV9600 NO
- Wiring
is powered
- Air proving switch on
(24VAC nominal)
combustion air blower system
-Vent damper (if used) is open
and end switch made
YES
Unplug Pilot Burner Cable,
Measure Voltage at
SV9500/SV9600 HSI
Terminals (24VAC
NO
Nominal, see INSET)
Igniter warms up and
glows red.
Replace Igniter /
Flame Rod Assembly
NO
Pilot Valve opens.
Replace SV9500/SV9600
YES
NO
Measure Volume to
Turn gas on.
SV9500 / SV9600 Voltage
Pilot Burner Lights?
must be at least 19.5 VAC
YES
Replace Igniter /
Flame Rod Assembly
NO
Replace Igniter / Flame
Main Valve opens?
Rod Assembly and retain.
Restart troubleshooting
Sequence. Does main
YES
valve open?
SYSTEM OK
If your fireplace still does not operate correctly, consult your dealer or
the manufacturer.
All service and repairs should be performed by a qualified agency.
All spare parts, optional fans, and optional trim finishes are available
from your local dealer or the manufacturer.
HWDF-Series Gas Fireplace
HW38-DF-I
INSET
HSI
Terminals
NO
Replace
SV9500/
SV9600
YES
NO
Check
Transformer
Line Volt
Supply
YES
Replace
NO
SV9500 /
SV9600.
Save old
Igniter/ Flame
Rod Assembly
for service.
YES
Discard old Igniter /
Flame Rod Assembly
Page 21