GF - A 17
Furnace Sequences Of Operation
1
3
4a
4e4c 4d4b
5a 5b
7
9
10
6
8a
8b
UD2 24v Mode
2a
2b2c
2d
If the furnace was operating on 1st stage heat, the indoor
motor will operate at 1st stage heating airflow for the
duration of the 1st stage heating fan off delay.
Indoor Blower motor operation thermostat fan
switch “ON”
R and G thermostat contacts close signaling a continuous
fan call. The continuous fan cfm is field selectable and can be
adjusted through the User Interface menu. The factory
setting is 50% of the cooling cfm selected but can be set at
25%, 50%, 75%, or 100%. If the system has a 2 stage outdoor
unit, the setting is 50% of the 2nd stage cooling cfm.
Indoor Blower Timing
The furnace control module (IFC) controls the variable speed
motor in the heating mode. The fan “ON” time is set at 45
seconds and is not field selectable. The blower “OFF” delay is
factory set at 100 seconds and can be adjusted.
10
2a
2d
1
3
10
*
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