GAS HEAT SEQUENCE OF OPERATION LGT092H-150H
First Stage Heat:
1 -
2 -
A3 Ignition Control. The Ignition control then routes
Ignition control energizes the combustion air blower
B6.
3 - After the combustion air blower B6 has reached
contacts close. The A3 routes 24VAC through N.C.
contacts of combustion air proving switch S18 to
energize the ignition module A3.
4 -
Second Stage Heat:
demand initiates W2 in the thermostat.
6 -
Unit Controller.
valve GV1.
End of Second Stage Heat:
8 -
is de-energized.
9 -
module.
End of First Stage Heat:
is de-energized.
11 -
turn de-energizing terminal LO of GV1. Combustion
air blower relay K13 located in the A3 ignition control
is also de-energized.
Optional Low Ambient Kit:
12 -
only) is routed through the low ambient kit fuses
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