How should I jumper the transformer to use a thermostat with my heat pump?
I believe that I should a variable speed unit. The old motor should have had a whole mess of white wires connected to the control board along with a couple colored wires. I have never tried to retrofit one with a PSC motor, other parts of the system probably won’t work. At any rate you would at least need a relay since the blower is 240 volt and the thermostat is 24 volt. If this were a standard PSC motor originally just hook the common to one leg of the contractor and run the speed tap through the relay. Hook the common wire to one side of the coil and the fan wire to the other side of the coil.