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  1. #1
    Join Date
    Feb 2005
    Posts
    29
    I work only in Ultra Low temp,so here is my question.
    I helped a buddy of mine install a heat pump resently 22000 btu,the unit is pre-charged ,as I assume they all are?; However we needed an additional 25'Feet of pipping size (5/8).So how much more refrigerant should we add to compensate for the additional lenght of pipping?

    Thx....

  2. #2
    Join Date
    Mar 2005
    Location
    Suppy NC
    Posts
    4,510
    read the lable it is ritten on it
    so many oz for every so many feet after the precharged lenth. normaly it goes by the liquid line lenth

  3. #3
    Join Date
    Jun 2003
    Location
    Jacksonville, FL.
    Posts
    4,313
    The installation manual should tell you that; every make is different.

  4. #4
    Join Date
    Feb 2005
    Location
    small island in the Pacific Ocean
    Posts
    558
    Usually it is 3oz for every 5' over 15'

    25-15=10 divided by 5 = 2 times 3= 6 ounces

  5. #5
    Join Date
    Jun 2002
    Location
    Bemidji, Mn
    Posts
    3,573
    Generally it is .6 oz, yes .6 oz, for every extra foot over 15ft.

    So, if you used 25 feet of lineset, you need an extra 6 oz.

    (10 extra feet)x.6oz= 6oz...

    You picked a fine time to leave me loose wheel...

    http://rapalaguy.spaces.live.com/

  6. #6
    Join Date
    Sep 2004
    Location
    Glendale AZ
    Posts
    299
    What brand of pump? Some come precharged for 15 ft.( york, rheem,ect) and some (carrier, bryant ect.) come precharged for 25 ft. Check your lable as tiknocker advised.

    Also the 5/8 is the suction line(gas). You should have a 3/8 liquid line. If you have a 1/4 liquid line you will have to adjust the additional charge per ft. for 1/4 line.(I have seen 1/4 liquid lines on 2 ton units)

    [Edited by danj on 04-10-2005 at 08:52 PM]
    The bitterness of poor quality remains long after the sweetness of low price has gone.

  7. #7
    Join Date
    Feb 2005
    Posts
    29
    Thx...Gentlemen and my appologies it was a 3/8 line.

  8. #8
    Join Date
    Feb 2005
    Location
    small island in the Pacific Ocean
    Posts
    558
    Chad711 - .6 for every foot over 15 is 3oz. for every 5 - its the same thing

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