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Gas Control Valve
Pilot Adjustment Screw
Inlet
Pressure
Manifold Pressure
Test Connection
Figure 12. Sit Nova 820 gas valve.
Pilot Burner Adjustment
1. Locate Pilot Adjustment Screw. (See figure 12.)
2. Adjust pilot screw to provide properly sized flame as shown in
figure 13).
f i r e - p a r t s . c o m
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 13. Pilot Burner
Troubleshooting
The following is a troubleshooting chart of possible problems:
PROBLEM
Noisy Pilot Flame
Locate pilot adjustement screw on gas
control valve. Flame is decreased by
turning adjustment screw clockwise.
Pilot won't ignite
Disconnect remote wires and try to
light pilot. If pilot now works, remote
connections are faulty. Check wiring
diagram
Main burner will
1. Check wiring (see figure 12).
not light
2. Check wall switch for proper
connection.
Maintenance
Power
Generator
Wall Switch
MD38-BV
CORRECTIVE ACTION
12.
figure
Troubleshooting
HONEYWELL SV 9500 /SV9600
Troubleshooting 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
(24 VAC 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 (24 VAC
NO
Nominal, See INSET)
Igniter warms up
and glows red.
Replace Igniter/
Flame Rod Assembly.
Pilot Valve opens.
NO
Replace SV9500/SV9600
YES
NO
Measure Voltage to SV9500
Turn gas on.
/SV9600. Voltage must
Pilot Burner lights?
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
Discard old Igniter/
Flame Rod Assembly.
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.
MD38-BV Homefire
MD38-BV-I
INSET
HSI
Terminals
NO
Replace
SV9500/
SV9600
YES
Check
NO
Transformer
Line Volt
Supply
YES
Replace
NO
SV9500/
SV9600.
Save old
Igniter/Flame
Rod Assembly
YES
for service.
Page 11
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