Constant Fan - GE AZ45E07EA Series Technical Service Manual

Constant Fan

In Constant Fan mode, the Zoneline operates in
High fan mode regardless of fan setting.
The constant fan feature allows the fan to operate
even when the Zoneline is set in the OFF position.
This will allow continuous air circulation in the room
shall be made available as a selectable option
through the use of an auxiliary set button mode.
The selection of this function will override the CDC
provision.
Fan Operation
Both fan motors are variable speed DC fan motors
with RPM feedback and regulation control. Any time
a fan is energized, the control checks that the fan
reaches the target RPM speed +/- 150 RPMs. If the
target cannot be met, the fan motor will shut down
for 15 minutes, and will set a fault code. It will then
reattempt to run every 15 minutes. If the fan motor
reaches the proper RPM, the fault code will clear.
If the error does not clear, the fault code shall be
stored in memory and the Zoneline will function as
follows:
• For detected indoor fan failures, the Zoneline
will cease all operation until the next try to
energize the fan.
• For detected outdoor fan failures, the Zoneline
will revert to stage 3 heating (if it is trying to run
in stage 1 or stage 2 heating). The Zoneline will
then the run indoor fan only if it is trying to run
in cooling mode.
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