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SEQUENCE OF OPERATION
FOR FURNACES EQUIPPED WITH TIME DELAY
TIME LINE DESCRIPTION
Start Time
Thermostat Calls for Heat
relay.
circuit.
15 Second Purge Cycle
combustion.
7 Seconds
Ignition Cycle and
Flame Sense
of combustion or gas.
2 & 3 Ignition Cycles
If Needed
not
Heating Cycle
90 Second Shut Down
NOTE: On some models, Sail Switch is before limit switch.
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