Montigo MD44 DV - Manual (Page 16)

Part No. XG0120 Page 16
MD44-DV Direct Vent Vented Fireplace
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 other accessories are available
from the manufacturer or your local dealer.
D44DV-I
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
Gas Control Valve
Pilot Burner Adjustment
1. Remove Pilot Adjustment Cap. (See figure 22.)
2. Adjust pilot key to provide properly sized flame. (See figure 21).
3. Replace pilot adjustment cap.
4. 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 21. Pilot Burner
Troubleshooting
The following is a troubleshooting chart of possible problems:
PROBLEM CORRECTIVE ACTION
Noisy Pilot Flame Remove pilot adjuster cap, located
next to gas shut off 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 22
Main burner will 1. Check wiring (see figure 22)
not light 2. Check wall switch for proper
connection.
MD44-DV
Manifold Pressure
Test Connection
Pilot Adjustment Screw
Inlet
Pressure
Power
Generator
Wall Switch
Figure 22. Sit 820 gas valve.