Honeywell SmartValve SV9520H Manual page 12

SV9520H SMARTVALVE™ SYSTEM CONTROL LINE VOLTAGE POLARITY SENSE MODELS
SEQUENCE OF OPERATION WITH ST9160 ELECTRONIC FAN TIMER OR 208907 TERMINAL BOARD
APPLY POWER TO APPLIANCE
THERMOSTAT CALLS FOR HEAT
AIR PROVING SWITCH PROVED
OPEN?
COMBUSTION AIR BLOWER ON
AIR PROVING SWITCH PROVED
CLOSED WITHIN 30 SECONDS?
PREPURGE
HOT SURFACE IGNITER ON
FOR WARM-UP TIME
MAIN VALVE OPENS
HOT SURFACE IGNITER OFF
MAIN BURNER LIGHTS AND IS
SENSED DURING TRIAL
FOR IGNITION?
CIRCULATING AIR FAN ON
AFTER DELAY
FLAME SENSE LOST?
THERMOSTAT CALL FOR
HEAT ENDS
MAIN VALVE CLOSES
COMBUSTION AIR BLOWER OFF
AFTER POST PURGE
CIRCULATING AIR FAN OFF
AFTER DELAY
WAIT FOR NEXT CALL FOR HEAT
69-1383
SV9520 DIRECT HOT SURFACE IGNITION SmartValve™ SYSTEM CONTROL
1
NO
YES
NO
YES
NO
YES
2
YES
NO
1
Fig. 11. SV9520 sequence of operation.
WAIT FOR AIR PROVING
SWITCH TO OPEN
FIVE-MINUTE WAIT PERIOD
COMBUSTION AIR BLOWER OFF
30 SECONDS
BETWEEN TRIAL PURGE
MAIN VALVE CLOSES
FAILED TRIALS FOR IGNITION
LESS THAN FOUR DURING
THIS IGNITION SEQUENCE?
NO
MAIN VALVE CLOSES
FLAME SENSE LOST MORE
THAN FIVE TIMES IN THIS CALL
FOR HEAT OR OTHER
ABNORMAL OPERATION?
3
YES
1 WHEN SmartValve™ IS POWERED, LED WILL BE IN
"HEARTBEAT" MODE (BRIGHT-DIM-BRIGHT-DIM, ETC.).
2 THIS FUNCTION OCCURS ONLY WITH ST9160
CONNECTED TO SmartValve™ SYSTEM CONTROL.
3 SEE TROUBLESHOOTING SECTION FOR DETAILED INFORMATION.
12
1 HOUR AUTO LOCKOUT
RESET DELAY
CIRCULATING AIR FAN OFF
AFTER DELAY
YES
COMBUSTION AIR BLOWER
OFF AFTER POST PURGE
NO
2
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