GAS HEAT SEQUENCE OF OPERATION
First Stage Heat:
1 -
2 - 24VAC is routed from TB1 to ignition control A3
through P2. A3 proves N.C. primary limit S10 and
N.C. rollout switch S47.
3 - Combustion air inducer blower B6 is energized.
4 - After the combustion air inducer B6 has reached
contacts close.
Second Stage Heat:
6 -
7 - A second stage heating demand is received by TB1.
The second stage heat signal passes from TB1 to
A3.
8 -
GV1.
End of Second Stage Heat:
9 -
is de-energized.
10 - Terminal HI of GV1 is de-energized by A3 control
module.
End of First Stage Heat:
11 -
is de-energized.
12 - Ignition A3 is de-energized in turn de-energizing
terminal LO of GV1.
Optional Low Ambient Kit:(ETL/CSA -50° C Low
Ambient Kit)
13 - Line voltage is routed through the N.C. low ambient
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