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Old 07-24-2010, 07:53 AM   #1
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compressor stops after 10 minutes - new capacitor


I replaced a failed blower motor in our air handler unit recently. After restarting the AC unit the compressor will only run for approximately 10 minutes, while the condensor fan continues running. I believe it is overheating and the thermal switch cuts out. 120 degree case temp. I have replace the capacitor and have the same problem.

I have connected a gauge set and the low side pressure is 50 PSI, suction temp is 78 degrees. Outdoor air temp was 89, indoor temp at vents was 65, with humidity at 83%.

This is a 15 year old unit.
Thanks

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Old 07-24-2010, 08:24 AM   #2
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compressor stops after 10 minutes - new capacitor


Sounds like you have lost a good portion of the freon due to a leak. Not enough left to cool the compressor. Good chance the ice formed from the blower failure damaged the indoor coil.

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Old 07-24-2010, 10:13 AM   #3
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compressor stops after 10 minutes - new capacitor


I'd hook up the high side if you can and make sure the head pressure is not going way up. If your condensor coils are clogged you may be going out on high head pressure.

Don't take it for granted that a visible inspection of the condenser coils is good enough. There may be crud buried between the fins you can't see. Take the top off and spray from the inside out with a water hose (pull disconnect first or shut off breaker)

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Old 07-24-2010, 10:35 AM   #4
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compressor stops after 10 minutes - new capacitor


Wouldn't have low suction pressure with dirty condensing coils. Head pressure would be driven up as would the suction pressure. Dirty evap coil will cause low suction pressure but not a high temp on the suction line. It's low on charge, low enough that it has gone past freezing up to not working.
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Old 07-24-2010, 11:16 AM   #5
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compressor stops after 10 minutes - new capacitor


Well you are right Marty, it's definately low on charge.. or clogged inside AND out

Please let us know what you come up with MW.
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Old 07-24-2010, 12:36 PM   #6
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compressor stops after 10 minutes - new capacitor


Thank you for the input. I will check the areas you suggested. I know there was frost on the outside line at the time of the blower failure.

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