Trane ACONT900AC43UA Service Manual page 125

IFC Inducer Learning Routine Sequence
· The furnace IFC now stores this learned operating
3
inducer RPM for 65% (medium) heat in its memory.
· The furnace IFC will use this stored learned operating
3
inducer RPM for 65% (medium) heat calls it receives in
the future.
· If the furnace IFC
3
heat operation it will now start the learning routine for
40% (low) heat.
· The furnace IFC will then continue to reduce the
3
inducer motor RPM in steps until the furnace IFC
6b
detects that PS-1 is open.
5a
· When PS-1 opens, the furnace IFC
5a
the inducer motor RPM.
6b
· The furnace IFC then adds an additional number
3
of RPM to the 40% (low) heat inducer motor
RPM until PS-1 closes.
· The additional number of RPM plus this NOTED RPM
is the learned 40% (low) heat inducer operating RPM.
· The furnace IFC now stores this learned inducer
3
operating RPM for 40% (low) heat in its memory.
· The furnace IFC
3
inducer operating RPM for 40% (low) heat calls it
receives in the future.
· Whenever the furnace is powered up or after a
RESET, the furnace IFC
learning routine for 100% (high) heat until it receives a
call for 100% (high) heat.
is still receiving a call for low
will NOTE
3
NOTED
6b
5a
will use this stored learned
will not go through a
3
Furnace Sequences Of Operation
4a
3
6a
5a
4b
1
2
10
7
9
6b
5b 5c
4c 4d
8
*
GF - A 7