Honeywell SmartValve SV9520H - Page 12

SV9520H SMARTVALVE™ SYSTEM CONTROL LINE VOLTAGE POLARITY SENSE MODELS
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Fig. 11. SV9520 sequence of operation.
APPLY POWER TO APPLIANCE
THERMOSTAT CALLS FOR HEAT
AIR PROVING SWITCH PROVED
OPEN?
COMBUSTION AIR BLOWER ON
HOT SURFACE IGNITER ON
FOR WARM-UP TIME
CIRCULATING AIR FAN ON
AFTER DELAY
MAIN BURNER LIGHTS AND IS
SENSED DURING TRIAL
FOR IGNITION?
MAIN VALVE OPENS
HOT SURFACE IGNITER OFF
FLAME SENSE LOST?
THERMOSTAT CALL FOR
HEAT ENDS
FIVE-MINUTE WAIT PERIOD
WAIT FOR AIR PROVING
SWITCH TO OPEN
FLAME SENSE LOST MORE
THAN FIVE TIMES IN THIS CALL
FOR HEAT OR OTHER
ABNORMAL OPERATION?
PREPURGE
30 SECONDS
BETWEEN TRIAL PURGE
AIR PROVING SWITCH PROVED
CLOSED WITHIN 30 SECONDS?
COMBUSTION AIR BLOWER OFF
MAIN VALVE CLOSES
COMBUSTION AIR BLOWER
OFF AFTER POST PURGE
1 HOUR AUTO LOCKOUT
RESET DELAY
MAIN VALVE CLOSES
COMBUSTION AIR BLOWER OFF
AFTER POST PURGE
CIRCULATING AIR FAN OFF
AFTER DELAY
WAIT FOR NEXT CALL FOR HEAT
FAILED TRIALS FOR IGNITION
LESS THAN FOUR DURING
THIS IGNITION SEQUENCE?
NO
NO
YES
YES
YES
NO
NO
MAIN VALVE CLOSES
YES
YES
NO
YES
NO
M17610
SV9520 DIRECT HOT SURFACE IGNITION SmartValve™ SYSTEM CONTROL
SEQUENCE OF OPERATION WITH ST9160 ELECTRONIC FAN TIMER OR 208907 TERMINAL BOARD
2
3
1
CIRCULATING AIR FAN OFF
AFTER DELAY
2
1
2
3
WHEN SmartValve™ IS POWERED, LED WILL BE IN
"HEARTBEAT" MODE (BRIGHT-DIM-BRIGHT-DIM, ETC.).
THIS FUNCTION OCCURS ONLY WITH ST9160
CONNECTED TO SmartValve™ SYSTEM CONTROL.
SEE TROUBLESHOOTING SECTION FOR DETAILED INFORMATION.
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