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  1. #1
    Join Date
    Apr 2012
    Location
    Iraq
    Age
    35
    Posts
    624
    Rep Power
    16

    outdoor unit fan run before compressor?



    Hi
    In cooling mode
    I noticed in some mini split ac unit in the outdoor unit that fan and compressors not running in the same time but the fan starts then after 3 seconds the compressor run
    and same when outdoor unit turn off
    the compressor turn off then after 3 seconds the fan turn off
    what are the advantage from such operation



  2. #2
    Join Date
    Oct 2001
    Location
    Nottingham UK
    Posts
    5,733
    Rep Power
    51

    Re: outdoor unit fan run before compressor?

    It's to force air across the condenser to reduce the high side pressure so that the compressor starts against the minimum pressure which also reduces the start up amps

  3. #3
    Join Date
    Apr 2006
    Location
    Not so sunny coast (BC Canada)
    Age
    41
    Posts
    1,645
    Rep Power
    23

    Re: outdoor unit fan run before compressor?

    As said above it reduces start up stress on the compressor,
    Now in Redvers Sask.

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