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5 ton goodman ac unit

Replaced compressor in 5 ton ac unit. ck for leaks with nitrogen. ran a deep vacum . added freon r 22 to 50 psi pressure before starting. unit ran for about 1/2 hour then stop . Kick out in overload. never fully equalized totally.
thought there might be restricktion in system , ck piston its ok, ck filter in unit its ok . took off high side line set left suction side and ck with nitrogen.
could it be the new replacement compressor bad.

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You MUST WEIGH IN THE NEW CHARGE OF R-22. There should be a label on the side of the a/c unit that states what the factory charge was. This is only a starting point. Once you have the factory charge in the system, then turn on the unit and allow it to stabilize (5 min) . Check pressure on low side and check teperature on low side pipe. Temperature of pipe should be 8 to 15 degrees above what the boiling point of the refrigerant is for the current pressure you are reading. If the temperature is more than 15 degrees, add R-22 in 4oz increments allowing 5min in between each time you add until you are in the "zone". When you do this, your head pressure needs to be 225-250. if you need to cover the coil or block the outdoor fan to do this then do it. Hook up the vacuum pump and start over

Posted on Jun 18, 2008

  • Chris Lyon
    Chris Lyon Jun 18, 2008

    The compressor tripped on overload because there was not enough freon in the system to keep the compressor cool.

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