Heat Pump Compressor: Bad Run cap and start assist
I was hoping someone could provide some insight. I noticed yesterday that my outside unit (both compressor and fan) were not working. Breaker was tripped...heat was working of aux ht (coils) which will run up my electric bill.
I was trouble shooting and I turned on the breaker and blew the start assist device on the compressor (PTCR: Positive Coef Resistor Goddman B11416-70 (-71 replacment)). I removed it form the circuit hoping that the 45uf run cap for the compressor would be sufficient for starting; the fan worked fine but the compressor was not starting.
I removed the run cap (45/5) and checked the caps (fan was fine a t ~5 uf; compressor cap 0 uf: open circiuit; that explains why the compressor was not running without the PTCR !
Just purchased a replacement PTCR and a run cap from my local HVAC supplier (PTCR is expensive). My question is what could of caused my problem ? My guess is that the compressor run cap shorted throwing the breaker. Upon turning on the breaker it both blew the PTCR and the compressor cap (now open circuit). I probably should test the resistance of the compressor winding ? Thanks in advance.
Last edited by y2k600f4; 03-04-2013 at 10:33 AM.