Bryant AC Won't Stay On

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Old 06-29-13, 11:00 PM
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Bryant AC Won't Stay On

Hello all! Virgin poster here.

I've tried searching through other threads to see if this has already been answered but no luck so far. I have a Bryant AC that's about 10yrs old now. Last summer the compressor would fire up but not the fan so after a bit of googling I went ahead and replaced the capacitor. Problem solved.

This summer, same thing. I thought "surely the capacitor can't be bad again?" so I went and had a friend with some experience in HVAC come take a look. He did the volt tests and found that the capacitor was bad again along with a bad wire so after a run to the supply store we had installed a new capacitor and black power cable.

We both had other obligations so couldn't finish fixing at the time. Now it's 90 degrees inside and the problem is the AC will start (can hear both fan and compressor going) but after an intermittent time (anywhere from 3 seconds to 2 minutes) it will shut back off.

Any ideas?
 
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Old 06-30-13, 04:58 AM
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It could be low on charge and a low pressure switch could be opening the control circuit for the contactor. This can be diagnosed by an EPA certified technician.
 
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Old 06-30-13, 01:21 PM
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Its 90 out

More likely its a dirty condenser coil and tripping on high head pressure. To test, run it again on a hot day except this time have a lawn sprinkler spraying cold water on the top section of the aluminum coils outside that remove the heat. In this was you don't need gauges. The water will remove the heat while the unit is running... If it shuts off even quicker than it did before, that's because the suction pressure will be even lower proving a loss of charge...try it! Make sure the compressor has rested for 1 hour before testing because the compressor may be overheated. We usually cool these off with a bag of ice on top of the compressor to speed things up. Water would do fine as well.
 
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Old 06-30-13, 02:47 PM
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Haven't done the hose thing yet!

It's a lot hotter today than it was yesterday but the AC has been working all day without a hitch. Haven't changed or adjusted or tested anything further.

Odd.
 
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Old 06-30-13, 03:25 PM
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Could also be a condensor fan that is not spinning up to speed......or starts up and then slows down.
 
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Old 06-30-13, 07:30 PM
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If shes running good check the temps of the two refrigerant lines.

The suction line (larger of the two) should be sweating and dripping wet. If not, the compressor hasn't enough cooing to cool the compressor and will shorten its life overheat and burn the oil form sludge and you have a big mess on your hands. feel the small liquid line it should be warm but not hot. If its hot the hose trick will help cool the gas and give more capacity and cool the space and compressor quicker also.


So feel them pipes!!!!!! Can you feel it?????
 
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