Wayne EHG User Manual page 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 4 UDNER "IGNITON ARC
ESTABLISHED - NO FLAME".
1. ADJUST HIGH AND LOW GAS PRESSURE SWITCHES AS OUTLINED
IN SECTION II.14 IF THERE IS NO GAS FLOW CONTINUE BELOW.
2. CHECK TO INSURE THERE IS ADEQUATE GAS PRESSURE AND
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.
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.
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.
6. UTILIZE THE PRESSURE TAPS TO MEASURE THE GAS PRESSURE
AFTER EACH VALVE TO DETERMINE WHICH VALVE IS NOT OPENING.
OK
OK
OK
OK
OK
IF BURNER FIRES, ADJUST HIGH AND LOW GAS PRESSURE
SWITCHES AS OUTLINED IN SECTION II.14
IF NO GAS PRESSURE IS PRESENT CORRECT THE PROBLEM WITH THE
GAS SUPPLY.
CORRECT WIRING IF INCORRECT.
IF NO VOLTAGE IS PRESENT, CHECK THE PRESSURE ADJUSTMENT ON
THE SWITCH WITH NO VOLTAGE. IF PROPERLY ADJUSTED REPLACE
SWITCH.
OPEN COIL REPLACE VALVE.
REPLACE GAS VALVE.
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