GF - A 1
Furnace Sequences Of Operation
Communication Mode ........................................................................................................................ 2
Indoor Blower motor operation thermostat fan switch “ON” ........................................................... 3
24VAC Mode ....................................................................................................................................... 4
Thermostat call for W2 after W1 .................................................................................................... 4
W2 satisfied, W1 still called for ..................................................................................................... 4
W1 satisfied .................................................................................................................................. 4
Thermostat call for heat (1 stage heating thermostat) .................................................................... 4
Indoor Blower motor operation thermostat fan switch “CONTINUOUS”.......................................... 5
IFC Inducer Learning Routine Sequence ........................................................................................ 6
PS-1, PS-2 Inducer Learning Routine ............................................................................................ 6
High Heat Inducer Learning Routine................................................................................................ 8
Alert Code Recovery .........................................................................................................................10
Three-Stage Gas Furnace ................................................................................................................12
UD2 Communication Mode...............................................................................................................14
Comfort control call for 1st stage heat ((*A/T)CONT900)...............................................................14
Comfort control call for 2nd stage after 1st stage..........................................................................14
2nd stage satisfied, 1st stage still called for .................................................................................14
1st stage satisfied ........................................................................................................................14
Indoor Blower motor operation thermostat fan switch “CONTINUOUS”.........................................14
Indoor Blower Timing ....................................................................................................................14
UD2 24v Mode ....................................................................................................................................16
Thermostat call for 1st stage heat (2 stage heating thermostat) ...................................................16
Thermostat call for 2nd stage after 1st stage ................................................................................16
2nd stage satisfied, 1st stage still called for .................................................................................16
1st stage satisfied ........................................................................................................................16
Thermostat call for heat (1 stage heating thermostat) ...................................................................16
Thermostat satisfied .....................................................................................................................16
Indoor Blower motor operation thermostat fan switch “ON” ...........................................................17
Indoor Blower Timing ....................................................................................................................17
Alert Code Recovery .........................................................................................................................18
UH3 Sequence of Operation.............................................................................................................20
UH3 Inducer Learning Routine Sequence ......................................................................................22
Third stage inducer learning routine ..............................................................................................22
Indoor blower timing ......................................................................................................................23
Communicating Gas Furnaces
Section A
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