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