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  1. #27
    Quote Originally Posted by Milk man View Post
    The head pressure will sky rocket with an undersized coil on a Lennox heat pump. The only way to match an indoor coil with a Lennox heat pump is with the engineering data.
    Correct to properly match you need to match the coil but the unit is tripping head pressure almost instantly. Mismatched coil would take longer to trip.

  2. #28
    Join Date
    Nov 2001
    east kansas
    Right. Unless it's overcharge to begin with. It's been a while since I've seen an undersized coil. I think it took about three minute of run time with the pressures slowly raising then only a minute or two to hit the high pressure switch.

    First step has already been mentioned. Pull some gas so it will run and the diagnostic reading can be captured. Then the guessing can stop and the fixing can begin.
    Beware of advice given by some guy on the Internet.

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