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SV9401/SV9402/SV9403, SV9501/SV9502/SV9503, SV9601/SV9602 SMARTVALVE™
SV9X01/SV9X02/SV9X03 SmartValve™ FAMILY SEQUENCE OF OPERATION
START
APPLY 24 VAC TO APPLIANCE
THERMOSTAT CALLS FOR HEAT
PREPURGE/
SYSTEM
CHECK
PREPURGE (SV9X02 ONLY)
FLAME SIGNAL DETECTED?
INTERNAL CHECK OKAY?
TRIAL
• PILOT VALVE OPENS
FOR
• IGNITER POWERED
IGNITION
PILOT LIGHTS AND FLAME IS SENSED
DURING TRIAL FOR IGNITION?
MAIN
• IGNITER OFF
BURNER
• MAIN VALVE OPENS
OPERATION
ELECTRONIC FAN TIMER (EFT) OUTPUT ENERGIZES
FLAME SIGNAL LOST?
THERMOSTAT CALL FOR HEAT ENDS
• MAIN AND PILOT VALVES CLOSE
• EFT OUTPUT DE-ENERGIZES
END
IGNITER WILL TURN OFF ABOUT 30 SECONDS INTO THE TRIAL FOR IGNITION IF THE PILOT FLAME HAS NOT LIT. IT WILL TURN BACK
1
ON FOR THE FINAL 30 SECONDS OF THE 90 SECOND TRIAL FOR IGNITION. THE PILOT VALVE WILL BE ENERGIZED DURING THE
ENTIRE TRIAL FOR IGNITION. THIS IS NORMAL OPERATION FOR THIS GAS IGNITION SYSTEM.
Fig. 13. SV9401/SV9402/SV9403, SV9501/SV9502/SV9503, SV9601/SV9602 SmartValve sequence of operation.
5. Make sure the appliance call for heat function
provides proper inputs to the ignition control through
the 2X2 power connector.
6. Follow the Operating Sequence and Troubleshoot-
ing flow charts Fig. 13 and Fig. 14 to determine if the
ignition control system is defective.
YES
NO
NO
YES
NO
1
YES
YES
NO
13
• WAIT FOR FLAME SIGNAL TO DISAPPEAR.
• PILOT VALVE/IGNITER REMAIN OFF
THREE-SECOND FLAME
FAILURE RECYCLE DELAY
• PILOT VALVE CLOSES
• IGNITER OFF
SV9X01, SV9X02
SV9X03
LOCKOUT
• MAIN AND PILOT VALVES CLOSE
• EFT OUTPUT DE-ENERGIZES
FLAME LOST MORE THAN FIVE TIMES
IN ONE CALL FOR HEAT?
YES SV9X01, SV9X02
YES SV9X03
NOTE: Most modern gas appliances have more than
one component in the control string. Improper
operation of any one component in the control
string can cause the appliance to fail to operate.
Use Fig. 14 to locate and correct the true source
of the problem.
FIVE-MINUTE
RETRY DELAY
NO
M17218
69-1004—2
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