Schwank STSp-WP - Manual (Page 29)

SP-MSWP-BX-09A
STSp-WP Manual
RD: MAY 2004
RL: 9
KH
Page 25
MAIN BURNER LIGHTS
SPARK STOPS WHEN
BURNER LIGHTS
SYSTEM RUNS UNTIL CALL
FOR HEAT ENDS
CALL FOR HEAT ENDS:
SYSTEM SHUTS OFF
YES
NO
NO
• CHECK FOR GOOD SPARK AT IGNITER.....
(SEE PREVIOUS PAGE)
• CHECK OUTPUT VOLTAGE FROM CONTROL
TERMINALS....IF NONE REPLACE CONTROL.
• CHECK FOR 25 VAC ACROSS GAS VALVE.
• CHECK ELECTRICAL WIRING BETWEEN IGN-
TION CONTROL AND GAS VALVE.... IF
OK, .........REPLACE GAS VALVE.
CONTROL IS NOT SENSING FLAME WITHIN THE
21 SECOND TFI AND IS STILL TRYING TO LIGHT
• CHECK CONTINUITY OF SENSOR CABLE AND
GROUND WIRE.
• CHECK BURNER FLAME IS COVERING SEN-
SOR.
• IF CHECKS ARE OKAY.... REPLACE CONTROL.
NOTE: IF IGNITION CONTROLS GOES INTO A
LOCKOUT,SHUT DOWN BURNER AND RESTART
• CHECK CONTINUITY OF SENSOR CABLE AND
GROUND WIRE AS A POOR GROUND COULD
RESULT IN ERRATIC BEHAVIOUR AND NUI-
SANCE SHUTDOWNS EVEN THOUGH OPERA-
TION IS NORMAL AT THE TIME OF CHECKOUT.
• IF CHECKS ARE OK, .........REPLACE CONTROL
• CHECK TEMPERATURE CONTROLLER.
• CHECK FOR PINCHED WIRING,
• REMOVE GAS VALVE LEAD AT CONTROL, IF
V A L V E C L O S E S , R E C H E C K T H E
TEMPERATURE CONTROLLER AND WIRING,
• IF VALVE STAYS OPEN... REPLACE GAS
VALVE.
TROUBLESHOOTING ENDS
YES
NO
NO
YES
YES
cont’d