Montigo MD38 BV - Manual (Page 11)

Page 11
MD38-BV Homefire
Maintenance
Troubleshooting
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.
HONEYWELL SV 9500 /SV9600
Troubleshooting Sequence
NOTE:
Before Troubleshooting, Familiarize Yourself With
The Startup And Checkout Procedure.
· Turn Gas Supply off
· Set thermostat to
call for heat
SV9500/SV9600
is powered
(24 VAC nominal)
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
START
Igniter warms up
and glows red.
Pilot Valve opens.
Turn gas on.
Pilot Burner lights?
Main Valve opens?
SYSTEM OK
Unplug Pilot Burner Cable,
Measure Voltage at
SV9500/SV9600 HSI
Terminals (24 VAC
Nominal, See INSET)
Replace Igniter/
Flame Rod Assembly.
Replace Igniter/
Flame Rod Assembly.
Replace SV9500/SV9600
Measure Voltage to SV9500
/SV9600. Voltage must
be at least 19.5 VAC
Discard old Igniter/
Flame Rod Assembly.
Replace Igniter/Flame
Rod Assembly and retain.
Restart Troubleshooting
Sequence. Does main
valve open?
Replace
SV9500/
SV9600
Check
Transformer
Line Volt
Supply
Replace
SV9500/
SV9600.
Save old
Igniter/Flame
Rod Assembly
for service.
INSET
HSI
Terminals
CHECK:
· Line voltage power
· Low voltage transformer
· Limit Controller
· Thermostat
· Wiring
· Air proving switch on
combustion air blower system
· Vent damper (if used) is open
and end switch made
MD38-BV-I Gas Control Valve
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).
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
Manifold Pressure
Test Connection
Pilot Adjustment Screw
Inlet
Pressure
Power
Generator
Wall Switch
Troubleshooting
The following is a troubleshooting chart of possible problems:
PROBLEM CORRECTIVE ACTION
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
figure 12.
Main burner will 1. Check wiring ( see figure 12).
not light 2. Check wall switch for proper
connection.
MD38-BV