Results 1 to 11 of 11
  1. #1
    Join Date
    Oct 2009
    Location
    new jersey
    Posts
    246

    high head pressure

    A 20 ton rooftop york dm240n24b2aaa1e 2 years old. Head pessure 350 ambient today 75 on roof. Suction at best 60. Warm suction line. Subcooling 18. Customers sprinkler on roof because lint from laundry mat cloggs coil. Funny . Water on coil head down to about 225-250 subcooling the same suction line still warm. Still 55- 60 suction press. Temp. Accross drier dropped 5 deg. Circuit 1. Circuit 2 no refrigerant. Off on lpc. Im going back on monday to change drier. What do you think. Ill report back monday night.

  2. #2
    Join Date
    Apr 2012
    Location
    lexington, NC
    Posts
    32
    Did you clean the coils or just spray them down with water? Lint is hell on coils.

  3. #3
    Join Date
    Oct 2009
    Location
    new jersey
    Posts
    246
    The sprinkler is already there.

  4. #4
    Join Date
    Jun 2012
    Location
    Queens, New York
    Posts
    66
    Check the coil it might have to be split. I don't know if York does it but Trane doubles the coil and lint will build up in between the 2 coils. It looks clean but you would be surprised how much dirt builds up.

  5. #5
    Join Date
    Oct 2009
    Location
    new jersey
    Posts
    246
    Terrible suction press. With high head. Only circ1 trying.bad super heat. Ok subcooling at 16- 18 electronic sh/ sc checker.ill report next week after new drier on circ 1 and leak check #2. Itll be 20 tons if fun.

  6. #6
    Join Date
    May 2012
    Posts
    32
    sounds like a restriction probably the drier

  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,081
    Sounds like the compressor/compressors have been cooking for a while. Those mid sized Sunlines only move a little over 700CFM per ton through the condenser. So if your getting lint in the coils, it won't take long to cook the compressors, and clog the LLFDs. Put them on a monthly condenser coil cleaning program. And they'll get a better life span out of the compressors.
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  8. #8
    Join Date
    Aug 2011
    Location
    Pearl Miss
    Posts
    14
    Some Yorks have a 2nd row of the cod coil you would need to pull the top off carfully spreed and clean. Lint and cotten wood are hell.
    Last edited by beenthere; 06-03-2012 at 08:24 AM. Reason: fixed brand name spelling

  9. #9
    Join Date
    Aug 2011
    Location
    Pearl Miss
    Posts
    14
    Yorks not yours (opps)

  10. #10
    Join Date
    Oct 2009
    Location
    new jersey
    Posts
    246
    Thanks for the responces.

  11. #11
    Join Date
    Dec 2011
    Location
    Michigan
    Posts
    119
    York...probably a restriction usually the drier. Sometimes the orifice. Other times the condenser. I'd change the drier and blow through with nitrogen

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