SV9510/SV9520; SV9610/SV9620 DIRECT HOT SURFACE IGNITION SmartValve
SYSTEM CONTROL 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
PREPURGE
AIR PROVING SWITCH PROVED
CLOSED WITHIN 30 SECONDS?
YES
HOT SURFACE IGNITER ON FOR
WARM-UP TIME
MAIN VALVE OPENS
CIRCULATING AIR FAN ON AFTER
DELAY
HOT SURFACE IGNITER OFF
MAIN BURNER LIGHTS AND IS
SENSED DURING TRIAL FOR
IGNITION
CIRCULATING AIR FAN OFF
AFTER DELAY
MAIN VALVE CLOSES
THERMOSTAT CALL FOR HEAT
ENDS
FLAME SENSE LOST?
COMBUSTION AIR BLOWER OFF
AFTER POST PURGE
YES
WAIT FOR NEXT CALL FOR HEAT
YES
NO
NO
WAIT FOR AIR PROVING SWITCH
TO OPEN
FIVE-MINUTE WAIT PERIOD
COMBUSTION AIR BLOWER OFF
BETWEEN TRIAL PURGE
1 HOUR AUTO LOCKOUT RESET
DELAY
MAIN VALVE CLOSES
MAIN VALVE CLOSES
TRIALS FOR IGNITION LESS THAN
FOUR DURING THIS IGNITION
SEQUENCE?
FLAME SENSE LOST MORE THAN
FIVE TIMES IN THIS CALL FOR
HEAT?
CIRCULATING AIR FAN OFF
AFTER DELAY
COMBUSTION AIR BLOWER OFF
AFTER POST PURGE
NO
NO
NO
YES
YES
NO
YES
Fig. 10. SV9510/SV9520; SV9610/SV9620 sequence of operation.
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Содержание PPRTH-50-15
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