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  1. #1

    4 Ton Icp Restriction???

    Hi Guys This Is My First Post So Please Bare With Me. I Was On A Roof Top Unit Today And Had To Change Out The Compressor. Did The Normal New Drier, Suction Line Filter, Contactor. Nitro And Evac. Weighted In The Charge 11 Lbs R-22. Here Is Were It Gets Interesting, Started Up And Imediantly 10 Lbs Suction 200 Head. Shut Down Tried Agian Several Times Best Suction Was 22. Ok Observed A Frost Line From Outlet Side Of Suction Line Filter Through The Accumulater To Compressor. Since The System Was Monkeyed With Before Went Ahead And Changed The Suction Filter Again. Recharged, Same Problem. This System Has Fixed Tubes At The Evap Could They Be Stopped Up? Can A Accumulater Stop Up? What Am I Missing. Any Help Greatly Apreciated.

    (forgot I Tried It In Heat Mode Same Problem)

  2. #2
    Join Date
    Apr 2007
    Location
    Philadelphia
    Posts
    2,193
    Quote Originally Posted by red949597 View Post
    Hi Guys This Is My First Post So Please Bare With Me. I Was On A Roof Top Unit Today And Had To Change Out The Compressor. Did The Normal New Drier, Suction Line Filter, Contactor. Nitro And Evac. Weighted In The Charge 11 Lbs R-22. Here Is Were It Gets Interesting, Started Up And Imediantly 10 Lbs Suction 200 Head. Shut Down Tried Agian Several Times Best Suction Was 22. Ok Observed A Frost Line From Outlet Side Of Suction Line Filter Through The Accumulater To Compressor. Since The System Was Monkeyed With Before Went Ahead And Changed The Suction Filter Again. Recharged, Same Problem. This System Has Fixed Tubes At The Evap Could They Be Stopped Up? Can A Accumulater Stop Up? What Am I Missing. Any Help Greatly Apreciated.

    (forgot I Tried It In Heat Mode Same Problem)
    how good was the vacuum you pulled on it?

  3. #3
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    maybe the compressor that was changed was not bad!



    .

  4. #4
    first compressor was grounded on all three legs. have acid away in place.

  5. #5
    one hour vacum, nitrogen to 250, held fine, one hour vacum weighed in charge 11 lbs.

  6. #6
    Join Date
    Nov 2007
    Location
    Charlotte,nc
    Posts
    15
    I know you typed fixed tubes, but can you take the distrubitor apart if it contains a piston, I changed a compressor on a old York 5 ton rtu unit 7 month sago and the same problem, Since the compressor was lock up and had a leak, no refirgerant in the system, I removed the old compressor, installed the new compressor, and replaced the liquid line drier, evacuated the system, weighed the charge it 10.5lbs, and the same thing happend to me, recovered the refrigerant, took the metering device apart and found that the metering device/piston had debri blocking it, removed debri, and it ran like a champ.

  7. #7
    it has a header with short tubes between it and the evap coil. i am assuming this is where the metering devices are. looks like about five pairs. but i do not have any sweat?frost at these locations? all of the lines are dry?

  8. #8
    Join Date
    Feb 2005
    Posts
    284
    purchase a new metering header assy.

  9. #9
    Join Date
    Nov 2007
    Location
    Charlotte,nc
    Posts
    15
    suction line drier? does it have access valves on both sides and if so I guess you check pressure drop. and this might sound crazy, and by no means judging your abilities but is suction line drier between the compressor and revering valve?

  10. #10
    Join Date
    Nov 2007
    Location
    Charlotte,nc
    Posts
    15
    Quote Originally Posted by joebear View Post
    purchase a new metering header assy.
    as in a question to purchase a header assembly?
    My misunderstanding I overlooked the part where you said it was a Heatpump, and that you tried it in heat and the same thing, pressure of 200 was it the discharge off the compressor or the liquid line pressure?

  11. #11
    suction line filter is between rsv and acumulater before compressor. hard to check as acess to filter is limited. i can see frost on the outlet side of the suction filter, same as first filter so i would be thinking filter clogged. but that quick. havent run unit for more than a few minutes.

  12. #12
    200 head at the compressor then went to 160 right before i shut it off

  13. #13
    Join Date
    Nov 2007
    Location
    Charlotte,nc
    Posts
    15
    Suction line drier, pancake type or one of the large ones, and you typed that the suction pressure dropped at start up, not after a short time of running, Was the compressor a burn out or just grounded, if it was a burn out I would guess sluge in the liquid line drier but it happens in heat also, rules out liquid line drier stopped up, it would not be that quick, I would remove the suction line drier, and then try it, Suction line drier used only for a short time frame any way, use your best judgment on using one, I use them only after a burn out or I suspect acid in the system, and no matter what I remove them after 2 days if possible. If you are going to remove the suction line drier add an access valve on the suction line at the evaporator so you can check suction pressure there in the cooling mode, may help in future trouble shooting and make it easier for yourself in the future.

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