Vermont Casting DVRT41 - Manual (Page 34)

34
DVRT41 Direct Vent Gas Fireplace
10006740
SIT 822 Valve with a Honeywell Electronic Igniter
Troubleshooting the Gas Control System
START
•TURN GAS SUPPLY OFF
• TURN ON/OFF SWITCH
TO CALL FOR HEAT "ON"
POWER TO MODULE
(24V NORMAL)
SPARK ACROSS
IGNITOR SENSOR GAP
YES
YES
YES
• TURN GAS ON
PILOT BURNER LIGHTS?
SPARK STOPS WHEN
PILOT IS LIT?
MAIN BURNER LIGHTS?
SYSTEM RUNS UNTIL
ON/OFF SWITCH IS IN
"OFF" POSITION
TROUBLESHOOTING
ENDS
YES
YES
YES
NO
NO
NO
NO
NO
NO
CHECK: • LINE VOLTAGE (120VAC)
• LOW VOLTAGE TRANSFORMER
(19.5 minimum VAC)
• ON/OFF SWITCH
• WIRING CONNECTIONS
UNPLUG IGNITION LEAD
AND CHECK SPARK
AT MODULE
(24VAC normal)
SPARK OK?
• REPLACE MODULE
• CHECK IGNITION CABLE GROUND WIRING, CERAMIC INSULATOR
AND GAP. CORRECT AS NECESSARY
• CHECK BOOT OF IGNITION CABLE FOR SIGNS OF MELTING OR
BUCKLING. TAKE PROTECTIVE ACTION TO SHIELD
CABLE AND BOOT FROM EXCESSIVE TEMPERATURES.
• CHECK THAT ALL MANUAL GAS VALVES ARE OPEN, SUPPLY TUBING
AND PRESSURES ARE GOOD, AND PILOT BURNER ORIFICE
IS NOT BLOCKED.
• CHECK ELECTRICAL CONNECTIONS BETWEEN MODULE AND
PILOT OPERATOR ON GAS CONTROL.
• CHECK FOR 24VAC ACROSS PV-MVPV TERMINALS ON MODULE IF
VOLTAGE IS OKAY, REPLACE GAS CONTROL IF NOT, REPLACE
MODULE.
NOTE: IF S8600B GOES INTO LOCKOUT, RESET SYSTEM.
• CHECK CONTINUITY OF IGNITION CABLE AND GROUND WIRE.
• CLEAN FLAME ROD
• CHECK ELECTRICAL CONNECTIONS BETWEEN FLAME ROD & MODULE.
• CHECK FOR CRACKED CERAMIC FLAME ROD INSULATOR.
• CHECK THAT PILOT FLAME COVERS FLAME ROD AND IS STEADY BLUE
• ADJUST PILOT FLAME.
• IF PROBLEM PERSISTS, REPLACE MODULE.
• CHECK FOR 24VAC ACROSS MV-MVPV TERMINALS IF NO
VOLTAGE, REPLACE MODULE.
• CHECK ELECTRICAL CONNECTIONS BETWEEN MODULE AND GAS
CONTROL. IF OKAY, REPLACE GAS CONTROL, OR GAS CONTROL
OPERATOR.
NOTE: IF S8600B GOES INTO LOCKOUT, RESET SYSTEM
• CHECK FOR CONTINUITY OF IGNITION CABLE AND GROUND WIRE.
NOTE: IF GROUND IS POOR OR ERRATIC, SHUTDOWN MAY OCCUR
OCCASIONALLY EVEN THOUGH OPERATION IS NORMAL AT THE TIME
OF CHECKOUT.
• CHECK THAT THE PILOT FLAME COVERS FLAME ROD AND IS STEADY
AND BLUE.
• IF CHECKS ARE OKAY, REPLACE MODULE.
NO
YES