ELECTRONIC CONTROL SEQUENCE OF OPERATION
Compressor and Reversing Valve Control
Active Mode | Compressor | Reversing Valve State |
Cooling | On | |
Heat - Heat Pump | On | Energized |
Heat - Electric | Off |
|
Fan Only | Off |
|
* The Reversing valve stays in the last state until a call for heat or cooling (see figure below)
Compressor Operation:
The reversing valve only changes when required to provide cooling or heat pump. The RV valve stays in it's last state until required to change.
Cooling Mode
Once the ambient temperature rises past the cool demand threshold (Cool Set Point + 1.5 ˚F) (see figure below), and the compressor is not locked out, the cooling cycle begins. As shown in the figure below, the fan is started 5 seconds prior to the compressor. Once the ambient temperature has been lowered to the cool set point (Cool Set Point minus
.25 ˚F), the cooling cycle starts to terminate by shutting off the compressor. After a 30 seconds delay, the fan is shut off. (See figure below for graphic details)
23
