HydroTherm HVX 175, Installation And Operation Instructions Manual

Page: 31 / 40

31
TROUBLESHOOTING
Figure 8.2: Intermittent Ignition System Troubleshooting Sequence
NOTE: “ CALL FOR HEAT ” 24 VAC S UPPLY I S CONNECTED TO THE 24 V TERMINAL ON THE CONTROL.
TURN GA S S UPPLY OFF,
TURN THERMO S TAT
(CONTROLLER) TO
“ CALL FOR HEAT. ”
POWER TO
MODULE? (24 V
NOMINAL)
S PARK
ACRO SS
IGNITER/
S EN S OR
GAP?
PILOT BURNER
LIGHT S ?
S PARK
S TOP S WHEN
PILOT I S
LIT?
S Y S TEM
S HUT S
OFF?
S Y S TEM
RUN S UNTIL “ CALL
FOR HEAT ”
END S ?
MAIN BURNER
LIGHT S ?
TURN GA S S UPPLY
ON AND RECYCLE
“ CALL FOR HEAT. ”
“ CALL FOR HEAT ” END S
CHECK LINE VOLTAGE POWER, LOW VOLTAGE TRAN S FORMER, LIMIT CONTROLLER, THERMO S TAT (CONTROLLER), AND WIRING AL S O.
CHECK AIR PROVING S WITCH ON COMBU S TION AIR BLOWER S Y S TEM (IF U S ED) AND THAT THE VENT DAMPER END S WITCH (IF U S ED)
I S MADE.
CHECK IGNITION CABLE, GROUND WIRING, CERAMIC IN S ULATOR, AND S PARK GAP ARE CORRECT.
CHECK BOOT OF THE IGNITION CABLE FOR S IGN S OF MELTING OR BUCKLING, TAKE PROTECTIVE ACTION TO S HIELD CABLE
AND BOOT FROM EXCE SS IVE TEMPERATURE S .
CHECK THAT ALL MANUAL GA S VALVE S ARE OPEN, S UPPLY TUBING AND PRE SS URE S ARE GOOD, AND PILOT BURNER
ORIFICE I S NOT BLOCKED (PILOT GA S FLOWING).
CHECK ELECTRICAL CONNECTION S BETWEEN MODULE AND PILOT OPERATOR ON GA S CONTROL.
CHECK FOR 24 VAC ACRO SS PV-MV/PV TERMINAL S ON MODULE. IF VOLTAGE I S OKAY, REPLACE GA S CONTROL.
IF NOT, REPLACE MODULE.
NOTE: IT MAY BE NECE
SS ARY TO RECYCLE THE ‘CALL FOR HEAT ” MORE THAN ONCE TO CLEAR THE PILOT S UPPLY TUBE S OF AIR.
NOTE: IF CONTROL GOE S INTO LOCKOUT OR RETRY DELAY, RE S ET THE “ CALL FOR HEAT. ”
CHECK CONTINUITY OF IGNITION CABLE AND GROUND WIRE.
CLEAN FLAME ROD.
CHECK ELECTRICAL CONNECTION
S BETWEEN FLAME ROD AND MODULE.
CHECK FOR CRACKED CERAMIC FLAME ROD IN S ULATOR.
CHECK THAT PILOT FLAME COVER S FLAME ROD AND I S S TEADY AND BLUE.
ADJU S T PILOT FLAME.
IF PROBLEM PER S I S T S REPLACE MODULE.
CHECK FOR 24 VAC ACRO SS PV-MV/PV TERMINAL S ON MODULE. IF NO VOLTAGE, REPLACE MODULE.
CHECK ELECTRICAL CONNECTION S BETWEEN MODULE AND GA S CONTROL INCLUDING S AFETY CONTROL S WIRED IN THE CIRCUIT.
IF OKAY, REPLACE GA S CONTROL.
NOTE: IF CONTROL GOE S INTO LOCKOUT OR RETRY DELAY, RE S ET THE “ CALL FOR HEAT. ”
CHECK CONTINUITY OF IGNITION CABLE AND GROUND WIRE.
NOTE: IF GROUND I
S POOR OR ERRATIC, S HUTDOWN S MAY OCCUR OCCA S IONALLY EVEN THOUGH OPERATION I S NORMAL
AT THE TIME OF CHECKOUT.
CHECK THAT PILOT FLAME COVER
S FLAME ROD AND I S S TEADY AND BLUE, PILOT FLAME MU S T NOT BE MOVING AROUND DUE TO
OUT S IDE AIR FLOW S , ETC.
ADJU S T PILOT FLAME. CHECK GA S PRE SS URE MEET S APPLIANCE S PECIFICATION S WHILE APPLIANCE MAIN BURNER ON AND ALL
OTHER GA S APPLIANCE S ON THE S UPPLY ARE OPERATING AT FULL RATE.
IF CHECK S ARE OKAY, REPLACE MODULE.
CHECK FOR PROPER THERMO S TAT (CONTROLLER) OPERATION.
REMOVE MV LEAD AT MODULE, IF VALVE CLO S E S , RECHECK TEMPERATURE CONTROLLER AND WIRING. IF NOT, REPLACE
GA S CONTROL.
YE S
YE S
YE S
YE S
YE S
NO
NO
NO
NO
NO
YE S
YE S
NO
PULL IGNITION LEAD AND
CHECK
S PARK AT MODULE.
S PARK OK? NO
REPLACE MODULE
YE S
S TART
BEFORE TROUBLE S HOOTING,
FAMILIARIZE YOUR S ELF WITH
THE S TARTUP AND
CHECKOUT PROCEDURE S .
REPEAT PROCEDURE UNTIL
TROUBLE FREE OPERATION
I S OBTAINED.
NO