Easy Radiant Works PPRTH-50-15 Installation & Operating Instructions Manual page 39

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?
YES
COMBUSTION AIR BLOWER ON
AIR PROVING SWITCH PROVED
CLOSED WITHIN 30 SECONDS?
YES
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
YES
CIRCULATING AIR FAN ON AFTER
DELAY
FLAME SENSE LOST?
NO
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
NO
WAIT FOR AIR PROVING SWITCH
TO OPEN
FIVE-MINUTE WAIT PERIOD
NO
COMBUSTION AIR BLOWER OFF
BETWEEN TRIAL PURGE
NO
MAIN VALVE CLOSES
TRIALS FOR IGNITION LESS THAN
FOUR DURING THIS IGNITION
1
SEQUENCE?
YES
MAIN VALVE CLOSES
FLAME SENSE LOST MORE THAN
FIVE TIMES IN THIS CALL FOR
HEAT?
1
Fig. 10. SV9510/SV9520; SV9610/SV9620 sequence of operation.
YES
NO
NO
YES
1 HOUR AUTO LOCKOUT RESET
DELAY
CIRCULATING AIR FAN OFF
AFTER DELAY
COMBUSTION AIR BLOWER OFF
AFTER POST PURGE