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Thread: subcooling

  1. #14
    Join Date
    Sep 2002
    Posts
    4,970
    Have heard that a lot......seems like a lot less hassel then reclaiming and recharging by weighing in.

  2. #15
    Join Date
    Mar 2002
    Location
    Richmond, Virginia
    Posts
    4,264
    Goodman suggests using 126° over ambient for charging their heat pumps in the heating cycle. Most manufacturers post their own methods inside the od unit. Recovery, evacuation, and weighing back in is probably the most accurate, but the most expensive method for the customer.

    There is nothing more frightful than ignorance in action....Mark Twain

  3. #16
    Join Date
    Jan 2002
    Location
    East Grand Forks, MN
    Posts
    1,373
    Why don't you just charge it in the A/C mode and it's over.
    The reason why i say this is you ask about this right now and it's summer, not winter. unless you're in the southern hemisphere, you don't need to charge it in the heat mode.
    Anyway, i prefer the 126 degree over ambient rule when in the winter i need to charge a heat pump and i don't want be outside freezing.

  4. #17
    Join Date
    Apr 2003
    Location
    the Great Pacific Northwest
    Posts
    607
    Originally posted by HVAC Pro
    Goodman suggests using 126° over ambient for charging their heat pumps in the heating cycle. Most manufacturers post their own methods inside the od unit. Recovery, evacuation, and weighing back in is probably the most accurate, but the most expensive method for the customer.

    Interesting, never installed a Goodman, thanks for the reply.

  5. #18
    Join Date
    Jun 2005
    Location
    Clearwater,FL.
    Posts
    34
    the rule of thumb method will get you by in winter, but you always want to have the customer call you back for a spring checkup to properly set the charge superheat or subcooling whichever applies,i know some manufactures are vague about charging,old daves crazy approach method & wrap the cardboard box around the condenser & charge in cooling in below 60 degree weather for example.heatpump charges are only properly set in the cooling mode in at least 65 or above.

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