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  1. #1
    Anthony Alderman's Avatar
    Anthony Alderman Guest

    Default frost on suction line

    I found this frost on the foam sleeve on suction line in the crawlspace. I've never seen this before and don't know if it's a problem soooo HELP!
    I cant find any info on this.
    Thanks Tony

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  2. #2
    Join Date
    Mar 2007
    Location
    Plano, Texas
    Posts
    4,170

    Default Re: frost on suction line

    Frost on the suction line means only ONE thing, the suction line is less than 32 degrees.
    No it is not normal for air conditioners, but don't get too excited, yet.
    What was the indoor and outdoor temperature and was the A/C set to an unusually low setting.
    Next question, was there sufficient air flow.

    Jim Luttrall
    www.MrInspector.net
    Plano, Texas

  3. #3
    Anthony Alderman's Avatar
    Anthony Alderman Guest

    Default Re: frost on suction line

    Sorry should given more info...
    Heat pump
    outside temp 38
    inside at 68
    heat pump was running


  4. #4
    Join Date
    Mar 2008
    Location
    Charlotte NC
    Posts
    2,303

    Default Re: frost on suction line

    Quote Originally Posted by Anthony Alderman View Post
    Sorry should given more info...
    Heat pump
    outside temp 38
    inside at 68
    heat pump was running
    Anthony, it sounds like the transfer valve has the unit in cooling mode. The heat you are seeing inside the house is from the heat strips. I have seen this before. In the case I saw it was due to shorted wiring at the thermostat. Heating bills were through the roof!


  5. #5
    Anthony Alderman's Avatar
    Anthony Alderman Guest

    Default Re: frost on suction line

    how would you check that?


  6. #6
    Join Date
    Mar 2008
    Location
    Charlotte NC
    Posts
    2,303

    Default Re: frost on suction line

    Quote Originally Posted by Anthony Alderman View Post
    how would you check that?

    The technically exhaustive way is to look for 24v on the Orange control wire. Normally has 24v when in the cooling mode and 0v when in the heating mode. This is not always the case depending on mfg. but most often.
    The quick and dirty is to switch from heat to cool and listen for the transfer. The gas line (large) should become warm when in the heat mode, cold when in the cooling mode.


  7. #7
    Anthony Alderman's Avatar
    Anthony Alderman Guest

    Default Re: frost on suction line

    Thanks Vern
    I will see about that. How long do I need to wait between switching between heat to cool?


  8. #8
    Join Date
    Mar 2008
    Location
    Charlotte NC
    Posts
    2,303

    Default Re: frost on suction line

    Heatpumps switch between heat and cool on the fly everytime they go into defrost. There is no need to wait.


  9. #9
    Anthony Alderman's Avatar
    Anthony Alderman Guest

    Default Re: frost on suction line

    Thanks Vern


  10. #10
    David Bell's Avatar
    David Bell Guest

    Default Re: frost on suction line

    also look for a new thermostat,,,very often people change stats and don't know whether orange or blue wire activates reversing valve. By the looks of that suction line the coil is probably a block of ice


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