S8700B,D-F,J-M DIRECT SPARK IGNITION CONTROLS
69-1299
10
Fig. 9. S8700 Direct Spark Ignition system troubleshooting guide.
M16663
NOTE: BEFORE STARTING TO TROUBLESHOOT THIS SYSTEM:
1. UNDERSTAND THE APPLIANCE SEQUENCE OF OPERATION AS DEFINED BY THE APPLIANCE
MANUFACTURER.
2. ASSURE APPLIANCE INPUT POWER SUPPLY AND GAS SUPPLY ARE CORRECT AND TURNED ON.
WITH APPLIANCE POWERED AND GAS SUPPLY ON, SET
TEMPERATURE CONTROL TO GENERATE A CALL FOR HEAT
LED FLASHES SHOWING S8700 IS POWERED. [LED
FLASHES QUICKLY FOR A SHORT TIME AT START UP,
THEN MOVES TO STEADY ON/OFF PATTERN]
LED FLASHES STEADY ON/OFF CONFIRMING
SAFE START CHECK COMPLETED SUCCESSFULLY.
WAIT FOR PREPURGE DELAY [S8700J, K, L,
M MODELS ONLY – 30 SECONDS TYPICAL]
SPARK OUTPUT ENERGIZED; STRONG
SPARK AT SPARK ELECTRODE
MAIN BURNER GAS CONTROL ENERGIZED.
MAIN BURNER LIGHTS DURING TRIAL FOR
IGNITION.
MAIN BURNER STAYS ON WHEN
TRIAL FOR IGNITION ENDS.
MAIN BURNER STAYS ON THROUGH
END OF CALL FOR HEAT.
CALL FOR HEAT ENDS.
SYSTEM SHUTS OFF.
TROUBLESHOOTING ENDS.
CHECK AND REPAIR LINE VOLTAGE POWER, LOW VOLTAGE TRANSFORMER, LIMIT
CONTROLLERS, THERMOSTATS, WIRING, COMBUSTION AIR BLOWERS AIRFLOW
PROVING SWITCHES AND OTHER CONTROL COMPONENTS THAT PREVENT
POWER FROM REACHING THE IGNITION CONTROL. SEE FIG. 2 AND 3.
CONFIRM 24 VAC BETWEEN THE 24 VAC AND
THE 24 VAC (GND) TERMINALS OF S8700.
IF CONTROL LOCKS OUT [LED ON STEADY],
CHECK FOR FLAME AT MAIN BURNER.
REPLACE S8700
REPLACE S8700
REPLACE S8700
REPLACE S8700
REPLACE GAS CONTROL
IF S8700 GOES INTO LOCKOUT, RESET SYSTEM.
CHECK ALL IGNITION CABLE, BURNER GROUND WIRING, AND CERAMIC
INSULATION FOR LOOSE CONNECTIONS, POOR INSULATION, CRACKING, AND
MOISTURE. CHECK THAT SPARK GAP IS NOT TOO SMALL OR TOO LARGE. ALL OK?
REPAIR/REPLACE
AS NECESSARY
REPAIR/REPLACE
AS NECESSARY
IF S8700 GOES INTO LOCKOUT, RESET SYSTEM.
CHECK FOR 24 VAC BETWEEN S8700 VALVE AND
VALVE (GND) TERMINALS DURING TRIAL FOR IGNITION.
CHECK GAS SUPPLY, GAS CONTROL, AND GAS
CONTROL WIRING. REPAIR/REPLACE AS NECESSARY.
IF S8700 GOES INTO LOCKOUT, RESET SYSTEM.
CHECK ALL IGNITION CABLE, BURNER GROUND WIRING, AND CERAMIC
INSULATION FOR LOOSE CONNECTIONS, CRACKING, SHORTS TO APPLIANCE
CHASSIS. CHECK FLAME ROD FOR CONTAMINATION, DAMAGE, CONTACT WITH
BURNER. CONFIRM THAT MAIN FLAME ENVELOPES THE FLAME SENSE ROD
AND BURNER GROUND TO ALLOW PROPER FLAME SENSE. ALL OK?
IF S8700 GOES INTO LOCKOUT, RESET SYSTEM.
CONFIRM 24 VAC BETWEEN THE 24 VAC AND 24 VAC (GND) TERMINAL ON S8700. CHECK FLAME ROD, FLAME ROD
WIRING, AND BURNER GROUND FOR GOOD CONNECTION. ALSO CHECK FLAME ROD INSULATORS AND WIRING
FOR EXCESSIVE HEAT. TEMPERATURES ABOVE 1000F CAN CAUSE BREAKDOWN IN CERAMIC INSULATION.
NOTE: IF BURNER GROUND IS POOR OR ERRATIC, OR LEADWIRE OR CERAMIC TEMPERATURES ARE TOO HIGH,
SHUTDOWNS MAY OCCUR EVEN IF OPERATION IS NORMAL AT TIME OF CHECKOUT. THIS TYPE OF SITUATION IS
HIGHLY UNLIKELY TO BE CAUSED BY THE S8700 CONTROL. REPAIR/REPLACE FLAME ROD AND WIRING AS NECESSARY.
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NOTES:
– B, D, J AND K MODELS GO THROUGH ONE TRIAL FOR IGNITION PERIOD BEFORE LOCKOUT.
– E, F, L AND M MODELS GO THROUGH THREE TRIAL FOR IGNITION PERIODS (WITH A 30 SECOND
INTERPURGE PERIOD BETWEEN EACH TRIAL FOR IGNITION.) BEFORE LOCKOUT CONTROL STARTS
ANOTHER IGNITION SEQUENCE AUTOMATICALLY AFTER ONE HOUR.
– CONTROL IS IN LOCKOUT WHEN VALVE IS CLOSED, SPARK IS OFF, ALARM IS ACTIVATED AND
LED IS ON STEADY. ON E, F, L, M MODELS, ONE HOUR AUTO RESET TIMER IS ALSO ACTIVATED.
REPEAT PROCEDURE UNTIL TROUBLE-FREE OPERATION IS OBTAINED.
Summary of Contents for S8700 Series
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