Vermont Casting DVRT36, DVRT43, DVRT39 Troubleshooting the Gas Control System, Start, 10002428

Vermont Castings, Majestic Products DVRT36/39/43

Troubleshooting the Gas Control System

SIT 822 Valve with a Honeywell Electronic Igniter

START

•TURN GAS SUPPLY OFF NO

• TURN ON/OFF SWITCH TO CALL FOR HEAT "ON" POWER TO MODULE

CHECK: • LINE VOLTAGE (120VAC)

•LOW VOLTAGE TRANSFORMER (19.5 minimum VAC)

•ON/OFF SWITCH

•WIRING CONNECTIONS

(24V NORMAL)

YES SPARK ACROSS

NO

UNPLUG IGNITION LEAD

AND CHECK SPARK NO • REPLACE MODULE AT MODULE

IGNITOR SENSOR GAP

YES

• TURN GAS ON NO

PILOT BURNER LIGHTS?

YES

(24VAC normal)

SPARK OK?

YES

•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.

SPARK STOPS WHEN	NO	NOTE: IF S8600B GOES INTO LOCKOUT, RESET SYSTEM.
PILOT IS LIT?		• CHECK CONTINUITY OF IGNITION CABLE AND GROUND WIRE.
YES		• 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.

NO

MAIN BURNER LIGHTS?

YES

SYSTEM RUNS UNTIL NO ON/OFF SWITCH IS IN

"OFF" POSITION YES

TROUBLESHOOTING

ENDS

•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.

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