TROUBLE SHOOTING THE GAS CONTROL SYSTEM
SIT 820 NOVA MILLIVOLT VALVE
GLASS DOOR TO BE REMOVED BEFORE SERVICE WORK
START
GAS SUPPLY ON
▼
CHECK
NO |
|
▼ | • SHUTOFF VALVE OPEN |
| |
| • CONFIRM GAS |
|
|
LIGHT PILOT WITH
PIEZO IGNITION
YES
NO
▼
•ELECTRODE GAP MIN. 1/8"
•ELECTRODE CRACKED
•ELECTRODE CABLE ATTACHED
•PIEZO IGNITOR GENERATES SPARK
•ELECTRODE CABLE NOT GROUNDED
▼
PILOT STAYS ON
YES
NO
▼
•FLAME ENGULFING THERMOCOUPLE BY 3/8"
•THERMOCOUPLE ATTACHED TO VALVE
•MNIMUM MILLIVOLT:
OPEN CIRCUIT 18MV
CLOSED CIRCUIT 5MV
•VENT SAFETY SWITCH TIGHT AND NO SHORTS
(FOR UNITS EQUIPPED WITH VENT SAFETY SWITCH)
▼
MAIN BURNER ON
NO
▼
•REMOTE SYSTEM ON
•REMOTE SYSTEM WIRE SHORTING OUT
•MINIMUM MILLIVOLT: OPEN CIRCUIT 300MV CLOSED CIRCUIT 165MV
•FLAME ENGULFING THERMOPILE/THERMOCOUPLE
•VALVE IS IN ON POSITION
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