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START
SYSTEM CHECK
TRIAL FOR
IGNITION
MAIN BURNER
OPERATION
END
(1) Ignitor will turn OFF about 30 seconds into the trial for ignition if the pilot flame has not lit. It will turn back ON for the final 30 seconds
of the 90 second trial for ignition. The pilot valve will be energized during the entire trial for ignition. This is normal operation for this gas
ignition system.
Apply 24 VAC
to Appliance
Thermostat
Calls for Heat
Flame Signal
Detected
Internal Check
OK
Pilot Light and lame is
Sensed During
Trial
For Ignition (1)
Ignitor Off
Main
Valve Opens
Pilot Valve Opens
Ignitor Powered
Flame Signal
Lost?
Thermostat Call
for Heat Ends
Main Pilot Valve
Close
Flame Lost More
Than 5 Times in
One Call for Heat
Main Pilot
Valves Close
3 Second Flame
Failure Recycle
Delay
Pilot Valve Closes
Ignition OFF
5 Minute Retry
Delay
Pilot Valve Ignition OFF
Wait for Flame Signal to
Disappear
DVC-35IPT INTERMITTENT PILOT SEQUENCE OF OPERATION