SV9440, SV9540, AND SV9640 SMARTVALVE™ SYSTEM CONTROLS
69-1227—02
14
SERVICE
WARNING
Fire or Explosion Hazard. Can cause property
damage, severe injury or death.
Do not disassemble the ignition control: it
contains no replaceable components. Attempted
disassembly, repair, or cleaning can damage the
control, resulting in gas leakage.
CAUTION
Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment
circuitry.
1. Disconnect power supply before installation.
2. Never apply a jumper across or short any of the
terminals in the SV9440, SV9540 or SV9640
wiring harness. This can damage the system
transformer or the control.
After servicing, verify proper system operation.
IMPORTANT
Allow 60 seconds after shutdown before reener-
gizing step-opening model to assure lightoff at
step pressure.
Sequence of Operation
1.
Make sure the ignition system control switch is in
the ON position.
2.
Follow the sequence of operation as shown in
Fig. 14 for ignition controls using an ST9160 Fan
Timer or 208907 Terminal Board; see Fig. 15 for
two-stage ignition controls with an ST9162 fan
timer.
Fig. 14. Sequence of operation for ignition controls with ST9160 fan timer or 208907 terminal board.
THERMOSTAT CALLS FOR HEAT
AIR PROVING SWITCH PROVED
OPEN?
COMBUSTION AIR BLOWER ON
PILOT VALVE OPENS;
IGNITER POWERED
PILOT LIGHTS AND FLAME IS
SENSED DURING TRIAL
FOR IGNITION?
CIRCULATING AIR FAN ON
AFTER DELAY
MAIN VALVE OPENS;
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
AIR PROVING SWITCH PROVED
CLOSED WITHIN 30 SECONDS?
COMBUSTION AIR BLOWER OFF
PILOT VALVE CLOSES;
PILOT IGNITER OFF
COMBUSTION AIR BLOWER
OFF AFTER POST PURGE
PILOT AND MAIN VALVES CLOSE
COMBUSTION AIR BLOWER OFF
AFTER POSTPURGE
CIRCULATING AIR FAN OFF
AFTER DELAY
WAIT FOR NEXT CALL FOR HEAT
THREE-SECOND FLAME
FAILURE RECYCLE DELAY
NO
YES
YES
YES
NO
NO
PILOT AND MAIN VALVES
CLOSE
YES
NO
YES
NO
M12234C
SV9440; SV9540; SV9640 INTERMITTENT PILOT SmartValve™
SYSTEM CONTROL SEQUENCE OF OPERATION WITH
ST9160 ELECTRONIC FAN TIMER OR 208907 TERMINAL BOARD
2
1
2
CIRCULATING AIR FAN OFF
AFTER DELAY
2
1
2
IGNITER TURNS OFF ABOUT 30 SECONDS INTO THE TRIAL FOR IGNITION
IF THE PILOT FLAME HAS NOT LIT. IT TURNS BACK ON FOR THE FINAL
30 SECONDS OF THE 90 SECOND TRIAL FOR IGNITION. THE PILOT VALVE
IS ENERGIZED DURING THE ENTIRE TRIAL FOR IGNITION. THIS IS NORMAL
OPERATION FOR THIS GAS IGNITION SYSTEM.
THIS FUNCTION OCCURS ONLY WITH ST9160 CONNECTED TO SmartValve™
SYSTEM CONTROL.
POWER APPLIED TO APPLIANCE