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viper 07-25-2012 04:27 PM

Need power interrupt delay, compressor reversing
I just witnessed my compressor reversing. We had a pretty good power dip to about 50V and was only momentary. I thought to go check the AC immediately and it was very loud. I figured it reversed and shut down immediately. Probably ran for 20sec that way. Afterwards, I went to look at the condensor and both the suction and liquid lines were cool. I waited a few minutes and restarted the system and it runs fine.

Had I not been around, I am sure it either would have blown the fuses, tripped something else out, or blown up. I would like to protect the system from future occurances. No one else in the house would know to shut it down.

turnermech 07-25-2012 05:16 PM

I don't see how it would have reversed by low voltage. In fact I can't see it reversing rotation by any means if it is a single phase unit.

biggles 07-25-2012 05:19 PM

keep in mind any unit equalizes after shut down from the hi side into the low side the real problem would of been a restart before it equalizes for an easy restart....

beenthere 07-25-2012 08:51 PM

Do you have a digital thermostat with time delay on it? Did the indoor unit stop running?

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