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  1. #1
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    copeland discus oil pressure

    What should the oil differential pressure be on a copeland discus compressor? I just replaced one today (grounded) and the new compressor will unload when still having a call for y2. Starts loaded with no voltage to unloader and after running about five minutes, cylinder unloads. I am thinking it has something to do with the oil pressure but do not know what the range is. This is a 15 ton split york. Oil burnt so I installed suction shell. Going back tomarrow to replace oil, suction filter, and liquid line drier again. Also the suction screen on the inlet of bad compressor was completly plugged. Currently I have 35 delta P oil (loaded and unloaded). Any suggestions?

  2. #2
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    Sep 2004
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    Kansas City, Kansas, United States
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    what controls the electric unloader?
    i would guess a call for y2 would deenergize the electric unloader?
    does it just load and unload on suction pressure?
    does it load on discharge air or chilled water temp?

    it is a york so i guess it is a pump out system not a pump down?
    I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
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  3. #3
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    Two stage thermostat. Y2 deenergizes soleniod 24v. It does not pump down.

  4. #4
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    Quote Originally Posted by socotech View Post
    What should the oil differential pressure be on a copeland discus compressor? I just replaced one today (grounded) and the new compressor will unload when still having a call for y2. Starts loaded with no voltage to unloader and after running about five minutes, cylinder unloads. I am thinking it has something to do with the oil pressure but do not know what the range is. This is a 15 ton split york. Oil burnt so I installed suction shell. Going back tomarrow to replace oil, suction filter, and liquid line drier again. Also the suction screen on the inlet of bad compressor was completly plugged. Currently I have 35 delta P oil (loaded and unloaded). Any suggestions?
    If it has an electric unloader on, then it cannot unload or load by itself. If the solenoid coil is de-energized, then it should unload.

    Did you install a new unloader with a new compressor ???? Or you used the old one ?

  5. #5
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    New unloader. Old one was leaking.

  6. #6
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    Las Vegas NV
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    Is it a single head compressor, 3D model?

  7. #7
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    No voltage before and after unloading

  8. #8
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    Quote Originally Posted by powell View Post
    Is it a single head compressor, 3D model?
    It is a one head compressor

  9. #9
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    Jun 2005
    Location
    Las Vegas NV
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    Quote Originally Posted by socotech View Post
    It is a one head compressor
    Ah, it uses the "Moduload" type unloader. It unloads based on compression ratio. It will be easier for you to understand if you read the AE bulletin from Copeland.

    Here's the link

    http://www.hvacrinfo.com/ae_index.htm

    Bulletin 21-1278

  10. #10
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    Quote Originally Posted by powell View Post
    Ah, it uses the "Moduload" type unloader. It unloads based on compression ratio. It will be easier for you to understand if you read the AE bulletin from Copeland.

    Here's the link

    http://www.hvacrinfo.com/ae_index.htm

    Bulletin 21-1278
    Thanks for the link. I needed that.

  11. #11
    Join Date
    Sep 2008
    Location
    Western PA
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    35 PSID is low for a typical copeland.

    I look for 50 net oil on a new and I've seen it as high as 55-57 on a new pump.

    I would immediately be looking for issues with a 35# net oil pressure.

    Is the oil level adequate? Is the system very dirty?

  12. #12
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    Quote Originally Posted by jpsmith1cm View Post
    35 PSID is low for a typical copeland.

    I look for 50 net oil on a new and I've seen it as high as 55-57 on a new pump.

    I would immediately be looking for issues with a 35# net oil pressure.

    Is the oil level adequate? Is the system very dirty?
    Oil level maybe a little high. Its about 3/4 sightglass. Yes system is dirty.

  13. #13
    Join Date
    Dec 2005
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    Quote Originally Posted by socotech View Post
    ...Yes system is dirty.
    You may want to pump it down and check the oil filter screen.

    Also, there may be trash in the load/unload chamber so that the needle does not seat/seal well or tightly. Thus, the unloading piston chamber is exposed to the suction side and makes it running unload.

    https://opi.emersonclimate.com/CPID/...AEB/ae1278.pdf

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