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  1. #1
    Join Date
    Apr 2008
    Location
    Greenwood Lake, ny
    Posts
    49

    Suction line frost

    I was working on rheem/ruud 048-10 seer
    indoor coil looked clean and spotless.Cleaned outdoor unit.
    When doing my checks it would have frost up to the compressor.
    I had 55 psi on lowside/175 on highside, wb 61 db 73-74
    my superheat was between 6 and 7, ODA between 70 and 72
    I do not work on many units , I am certified , went to a class
    for a week . I do not know everything like some of you guys
    who have bin doing this for yrs. I am a oil tech and the company
    is expanding to do other things . can someone help a newbee!!!
    I want to do it right and not take 3or more hours to do it

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,874
    Did you look at both sides of the indoor coil.
    Your SH indicates either a low air flow.

    After you verify air flow, recheck your SH, and SC.


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  3. #3
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
    Posts
    6,058
    Quote Originally Posted by beenthere View Post
    Did you look at both sides of the indoor coil.
    Your SH indicates either a low air flow.

    After you verify air flow, recheck your SH, and SC.


    To go into more technical things, you will need to apply for pro membership. Get your post count up to 15 and then apply.
    Been, look at the head it's 175psig...why do you say low air flow?

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    67,874
    Because low air flow will decrease head.
    Yes, it could just be that thing too. But I've gone back to systems where someone said the ID coil was clean. And they did you know what. And after I cleaned the coil. Guess what I had to do.
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  5. #5
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
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    Quote Originally Posted by beenthere View Post
    Because low air flow will decrease head.
    Yes, it could just be that thing too. But I've gone back to systems where someone said the ID coil was clean. And they did you know what. And after I cleaned the coil. Guess what I had to do.
    It's 175, high for those temps.

  6. #6
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    67,874
    Quote Originally Posted by hvaclover View Post
    It's 175, high for those temps.
    Not for a 10 SEER.

    Hate to say it this way. But its only 20F over outdoor ambient.

    Now my 13 SEER at home, that would be high head.
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  7. #7
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,956
    Quote Originally Posted by beenthere View Post
    Because low air flow will decrease head.
    Yes, it could just be that thing too. But I've gone back to systems where someone said the ID coil was clean. And they did you know what. And after I cleaned the coil. Guess what I had to do.
    Recover a big refrigerant overcharge, because they had been trying to get the suction pressure up by adding charge, explains head pressure.

  8. #8
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    Quote Originally Posted by udarrell View Post
    Recover a big refrigerant overcharge, because they had been trying to get the suction pressure up by adding charge, explains head pressure.
    Yep.

    I don't mind a tech making a mistake. I just hate having to clean the coil he should have CLEANED.
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  9. #9
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
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    Thats low load usually, but that head is slightly higher than it should be, assuming it's been run long enough.

    How's the condenser look for cleanliness? Hows the filters?

  10. #10
    Join Date
    Apr 2008
    Location
    Greenwood Lake, ny
    Posts
    49
    I am a newbee trying to do it right so forgive me.
    The indoorcoil was not frozen only suctionline has lot of frost
    at outdoor at the time and onsideof compressor. Could it be
    that the day was not a heavy load . to me it seemed it may be
    over charged not sure. customer said unit has bin working
    noproblems and cooled house. looked at fan speed it was set at
    med high could that have bin problem that not enough air movment
    over indoor coil.

  11. #11
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    Jan 2004
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    Its possible that its a low load problem.
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  12. #12
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
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    Quote Originally Posted by kw10925 View Post
    I am a newbee trying to do it right so forgive me.
    The indoorcoil was not frozen only suctionline has lot of frost
    at outdoor at the time and onsideof compressor. Could it be
    that the day was not a heavy load . to me it seemed it may be
    over charged not sure. customer said unit has bin working
    noproblems and cooled house. looked at fan speed it was set at
    med high could that have bin problem that not enough air movment
    over indoor coil.
    If that is a half horsepower motor than it is moving too slow.

    If you are icing heavy than the coil is probably froze too. Recheck the underside to be sure.

    Turn the furnace on to get a good inside load to get usable readings.

  13. #13
    Join Date
    Apr 2008
    Location
    Greenwood Lake, ny
    Posts
    49
    How do you check indoor coil to see if it is dirty.
    I looked at the top looked clean. Filters were clean also.
    I did clean OD unit. Its rheem/ruud.

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