Filter
Top Products
12427-4-0306
Page 13
START
System Check
Trial for
Ignition
Main Burner
Operation
END
Pilot Valve Opens
Ignitor Powered
Flame Signal
Detected
Thermostat
Calls for Heat
Ignitor OFF
Main
Valve Opens
Internal Check
OK
Pilot Light and Flame is
Sensed During
Trial For
Ignition (1)
Apply 24 VAC
ToAppliance
Main Pilot Valves
Close
Thermostat Call for Heat
Ends
Flame Signal
Lost?
Pilot Valve Ignition OFF
Wait for Flame Signal to
Disappear
Pilot Valve Closes
Ignition OFF
Main Pilot
Valves Close
Flame Lost More
Than 5 Times
in
One Call for Heat
5 Minute Retry Delay
3 Second Flame Recycle
Delay
YES
NO
NO
YES
NO
YES
YES
NO
YES
NO
(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.
SEQUENCE OF OPERATION