Bad /defective compressor? - http://www.hvacmechanic.com/ Forums
Original message
| Rooky
 |  "Bad /defective compressor?"
, posted Wed 4 Jun 14:55  
Ihad this amana condensing unit. Set t-stat for cooling call and set temp. to about 65 F. Indoor blower runs. I checked the filter, checked the drain line , it took me about 10 minutes to do this. I went outside to connect my pressure gauges and noticed that the outdoor unit was not running. Then after the delay on start relay closes again, the unit started and runs for about five minutes. During this time , I hear the pich sound coming from the compressor ( it's running and drowing about 15,2 amps (, name plate 14,4 Amps RLA ) changes, the low suction side pressure decreases ( falls to a point that the low pressure switch cuts the unit off. It does this all the time. I by-passed the low and high pressure switch and added R-22 to a point where the unit still can run even by doing what it is doing.Question. Is the running capacitor acting up or is the comprtessor defective.?
Thanks a lot.
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Replies:
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| theduke03
| "Re(1):Bad /defective compressor?" , posted Wed 4 Jun 17:17
Before you added freon I would like to have known the:
suction pressure
head pressure
suction line temp
liquid line temp
indoor temp
outdoor temp
I dont think it is a capacitor or the compressor.
Possibly a restriction or faulty txv.
"My dad was the most feared furnace fighter in Northern Indiana."
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| | rooky
| "Re(2):Bad /defective compressor?" , posted Thu 5 Jun 11:54
At first the suction pressure was about 40 PSI ( remember the unit runs for about five minutes then the pressure drops to about 30 PSI and the unit cycles off on low pressure, later It cuts on and the cycle continues ( off because of low pressure then cuts on etc etc etc ) The head pressure was about 280 PSI. that's when I decided to chemicly clean the condenser unit. Then, the low pressure was about the same and my head pressure dropped to about 230 PSI.
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| | theduke03
| "Re(3):Bad /defective compressor?" , posted Thu 5 Jun 18:22
You should always be checking temperatures when troubleshooting. You should also check the evap coil like Freon said. I'm still clueless. Was the suction line cold or room temp?
"My dad was the most feared furnace fighter in Northern Indiana."
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| | Freon
| "Re(3):Bad /defective compressor?" , posted Thu 5 Jun 17:24
How old is the system ?(old means check capacitor but not likely with the head pressure). Filter may be clean but check the evap coil... dirty coil could do this. Superheat and subcooling will tell you much. But all depends on nominal air flow through the evap coil.
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