SYSTEM OPERATION
25
The compressor may be de-energized for a short
delay during the reversing valve shift. (The delay period
is adjustable via the CoolCloud HVAC app or the push
buttons on the indoor board. The compressor delay
is intended to eliminate compressor noise during the
reversing valve shift.) The compressor will energize (or re-
energize) at high stage.
The UC control sends a request for defrost operation
to the integrated air handler control. The air handler control
energizes the electric heat sequencer outputs and operates
the ECM blower model at the electric heat speed.
Once the defrost cycle is terminated, the heat pump
commands the air handler/modular blower to end defrost
operation.
The system returns to heat pump heating operation
that was in eect prior to the defrost cycle.
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