Heat Pump Problems

[dyoung9121]

I have a Goodman heatpump with a Copeland Scroll compressor. The compressor was grounded so I have changed out the compressor. The compressor failed due to loose compressor wire. So I put in the new compressor and partially charge the unit by dumping liquid into the liquid line. I then start the compressor and the pressures are equalized and amp draw is 6.3 and is rated for 18 Amps. Finally the compressor shuts off so I feel the compressor and the compressor is hot. I figure that the compressor has an internal by-pass and just got too hot and shut down on thermal. Now, I leave the unit and come back the next day and start the compressor. This time the suction is 50 and head is 100. I pull the fan wire off to raise head pressure but it stays at 100. I then pull off the "O" wire for the reversing valve and the guage needle falls. I pull on and off several times and the guage needle does move each time. I know the unit is not fully charged but am not sure exactly whats going on. Any suggestions?

[install monkey]

blockage?
was the system pressure tested?
did you change filter driers?
did you vac it out?

[dyoung9121]

Yes, pressure tested to 100 psi and evacuated to 800 microns. I thought blockage too but then why are my pressures not equalized now?

[Jeremy Martin]

Are you checking pressures in heat mode or cool mode? And to which ports are you attaching your gauges?

** Never mind, I didn't read the OP correctly. Ignore me. **

[Brian_UK]

If pressures are low then reversing valve may not operate properly.

[The Viking]

Did you use OFN whilst you were brazing?
Sure the burned/loose wire was the cause and not a symptom?
Is the heating and the cooling cycles using different expansion/metering devices?

[moideen]

this is scroll compressor.have you check the rotation?

[nike123]

Check reversing valve.
http://www.achrnews.com/articles/don...e-outsmart-you

[dyoung9121]

Moideen it is a single phase compressor

[dyoung9121]

Viking, It is possible that the wire was a symptom but it was pretty loose and had melted insulation.
The cooling side uses an orfice for metering and the heat side uses a TXV

[dyoung9121]

Checking pressures in cool mode and am connecting to the common suction port and liquid line service valve.