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