I have a 3 ton Carrier split system heat pump. The condenser fan motor bearing locked
down. I replaced the motor. The old motor was an OEM 3 wire motor. I replaced with a
universal 4 wire motor. Installed a 5 mfd cap. Removed the wires from the duel cap on
the motor. ran my blk wire to the defrost board. ran my yellow wire to the contactor.
brown and brwn/wht wire to the new 5/440 cap.
Started the unit. verified proper rotation. Unit ran for about 10 seconds. contactor disengauged
Defrost board took it out. no 24 volts present at the contactor. I checked my low voltage wires
I have 24 volts across yellow and common going to the defrost board. Board kept the unit off
for about 5 minutes. Then, click the 24 volts was restored to the contactor for about 10 seconds- then off again for 5 minutes.
I disconnected power leads to the compressor . Restarted condenser fan motor came on and stayed on. Reattached compressor wires- restarted compressor pulled 8 amps.
RLA on compressor is 18 amps.
Checked pressures- compressor is running I did not see a low pressure switch. didnn't look that close either.