Is there a waiting period when turning on the breaker to the A/C?
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  1. #1
    Join Date
    Aug 2007
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    Is there a waiting period when turning on the breaker to the A/C?

    Well, the humidity is here. Is there a waiting period when flipping the power to the compressor? Thank you.

  2. #2
    Join Date
    Dec 2008
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    Buffalo NY
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    If you are warm turn it on.


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  3. #3
    Join Date
    Aug 2007
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    Quote Originally Posted by qwerty hvac View Post
    If you are warm turn it on.


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    LOL, thanks!

  4. #4
    Join Date
    Jun 2005
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    SW Wisconsin
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    All systems are different; some have compressor time delays after a shut down to provide the refrigerant system pressure time to equalize, allowing a restart without installed start kit capacitor assist.

    You could wait 5 minutes or, you could try it without delaying; the compressor, with some systems, will not be able to start until the refrigerant system requires a little more time to equalize.

  5. #5
    Join Date
    May 2000
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    Indianapolis, IN, USA
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    Some units have a heater for the compressor to boil off any liquid refrigerant that is sitting in the oil. Turning on the power 12 hours before using lets the heater do its job. But if it is warm out, not real critical.

  6. #6
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    Quote Originally Posted by BaldLoonie View Post
    Some units have a heater for the compressor to boil off any liquid refrigerant that is sitting in the oil. Turning on the power 12 hours before using lets the heater do its job. But if it is warm out, not real critical.
    If you live in a climate where nights are rather cold then the compressor [U]should to have a crank-case heater component; by all means it is good practice to turn that breaker on to the condenser a few days or so before running the A/C.

    Therefore, as Baldloonie is indicating, if it starts up with liquid refrigerant in the compressor oil, the oil will be pumped throughout the system, insulating the evaporator coil & settling in low areas. This can also cause early compressor failures due to lack of oil lubrication. Therefore, a crankcase heater can be a very important component...

  7. #7
    Join Date
    Aug 2012
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    2,573
    My question is why are you turning the power off in the first place?
    My name is TooCoolforschool and I am a chronic over charger.

  8. #8
    Join Date
    Jan 2009
    Location
    Keokuk, IA
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    Quote Originally Posted by toocoolforschool View Post
    My question is why are you turning the power off in the first place?
    +1, why was it turned off.

    No need to shut off the power or FWIM cover the unit up in winter time. In some areas with lots of trees, you might use a small cover just on the top. But full covers can actually trap in moisture and accelerate corrosion.

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