21
GAS TRAIN TROUBLESHOOTING
CHECK TO MAKE SURE 120 VOTLS IS PRESENT ACROSS THE WIRES FEEDING THE GAS TRAIN DURING IGNITION TRIALS. IF NOT, RETURN TO STEP
ESTABLISHED - NO FLAME”.
ST HIGH AND LOW GAS PRESSURE SWITCHES AS OUTLINED
IN SECTION II.14 IF THERE IS NO GAS FLOW CONTINUE BELOW.
IF BURNER FIRES, ADJUST HIGH AND LOW GAS PRESSURE
SWITCHES AS OUTLINED IN SECTION II.14
2. CHECK TO INSURE THERE IS ADEQUATE GAS
CAPACITY. INSTALL A PRESSURE GAGE AT THE INLET PRESSURE TAP.
WHEN THE BURNER IS OFF, THE GAS PRESSURE SHOULD BE
BETWEEN 3” AND 14” W.C.
IF NO GAS PRESSURE IS PRESENT CORRECT THE PROBLEM WITH THE
GAS SUPPLY.
3. CHECK THE WIRING AT EACH
GAS PRESSURE SWITCH AND EACH
GAS VALVE TO INSURE PROPER CONNECTIONS AND PROPPER WIRE
ROUTING. REFER TO FGIURE 11.
4. CHECK THE OPERATION OF THE GAS PRESSURE SWITCHES.
DURING A 4 SECOND IGNITION TRIAL, MEASURE THE VOLTAGE
BETWEEN THE VC CONNECTION ON THE HIGH PRESSURE SWITCH
AND L2. THEN MEASURE THE VOLTAGE BETWEEN THE N.O.
CONNECTION ON THE LOW PRESSURE SWITCH AND L2. BOTH
SHOULD READ 120 VOLTS.
CORRECT WIRING IF INCORRECT.
IF NO VOLTAGE IS PRESENT, CHECK THE PRESSURE ADJUSTMENT ON
THE SWITCH WITH NO VOLTAGE. IF PROPERLY ADJUSTED REPLACE
5. AT THIS POINT, ONE OF THE GAS VALVES MUST NOT BE OPENING.
CHECK THE RESISTANCE OF EACH SOLENOID COIL AND REPLACE IF
THE COIL IS ELECTRICALLY OPEN.
OPEN COIL
REPLACE VALVE.
6. UTILIZE THE PRESSURE TAPS TO MEASURE THE GAS PRESSURE
AFTER EACH VALVE TO DETERMINE WHICH VALVE IS NOT OPENING.
REPLACE GAS VALVE.
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