The thing I like about these units is that all the vital HP functions are in the outdoor unit and only the commands for the indoor temp measuring is on the indoor unit.
Currently, I just have the motor sitting on top of a 5gal water heater (in series with the rads) which functions as a table to hold the electronics and something to put sensors and valves on. The motor just tells me when the outdoor unit is on and its speed is a bit of an indicator of compressor speed (not very accurate).
I have not disconnected it because the lack of feedback from it would cause an error code.
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