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  1. #1
    Join Date
    Sep 2004
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    Kansas City, Kansas, United States
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    13,833

    Confused dx chiller unloading

    on a recip chiller ie trane e compressor,
    why can't you use mechanical or suction unloaders?
    i do not understand.


    st65
    I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
    YOU SHUT THE HELL UP AND QUIT RUNNING YOUR MOUTH!

  2. #2
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
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    3,725
    How many tons is it? Are you sure it doesn`t have any unloaders?Maybe internal of the compressor?
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  3. #3
    Join Date
    Jan 2008
    Location
    windy city
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    4,444
    didn't know there were any left in the field. 'e' and 'f' had an adjustment screw on the left manhole. some of the 'f' line had 3 electric solenoids on the right side

  4. #4
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
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    13,833

    Confused

    Quote Originally Posted by heavymetaldad View Post
    didn't know there were any left in the field. 'e' and 'f' had an adjustment screw on the left manhole. some of the 'f' line had 3 electric solenoids on the right side
    that is my question???
    why can't you use mechanical unloaders?
    why must they be electric???????????
    I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
    YOU SHUT THE HELL UP AND QUIT RUNNING YOUR MOUTH!

  5. #5
    Join Date
    Jan 2008
    Location
    windy city
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    4,444
    Quote Originally Posted by supertek65 View Post
    that is my question???
    why can't you use mechanical unloaders?
    why must they be electric???????????
    not quite sure how to answer - probably need to change compressor to the style you prefer. i would think the indv. solenoids, depending how you fire em, would give more flexibility. the 'screw' type locks you in to 9 - 10# range

  6. #6
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
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    3,725
    One option would be put use some pressure switches to unloaded at your predetermined pressure settings.
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  7. #7
    Join Date
    Sep 2008
    Location
    Pittsburgh,PA
    Posts
    64
    Just changed a model "E" last monday, it came with a mechanical unloader even though we needed the electric ones so we just had to change the hand hole cover. Model "E" and "F" compressors are no longer made just remanufactured in Charlotte N.C.

  8. #8
    Join Date
    Jan 2008
    Location
    windy city
    Posts
    4,444
    i stand corrected. haven't done it (swap covers). have to do anything with the oil lines?

  9. #9
    Join Date
    Sep 2008
    Location
    Pittsburgh,PA
    Posts
    64
    No oil lines need changed, just the hand hole cover.

  10. #10
    Join Date
    May 2008
    Location
    Jax Fl.
    Posts
    1,943
    Chillers do not use suction pressure actuated unloaders, only electric or Pneumatic.

    The suction unloader sideplate can be used on a chiller with a pneumatic 0-20 signal piped into the atmospheric reference port beside the setpoint adjustment.

    DX uses Suction unloaders or Pneumatic.

  11. #11
    Join Date
    Sep 2004
    Location
    Kansas City, Kansas, United States
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    13,833
    Quote Originally Posted by JRINJAX View Post
    Chillers do not use suction pressure actuated unloaders, only electric or Pneumatic.

    The suction unloader sideplate can be used on a chiller with a pneumatic 0-20 signal piped into the atmospheric reference port beside the setpoint adjustment.

    DX uses Suction unloaders or Pneumatic.
    if a recip chiller has txv's is it not dx?
    I WILL SELL WORK,GENERATE BUSINESS, GO GET NEW CUSTOMERS!
    YOU SHUT THE HELL UP AND QUIT RUNNING YOUR MOUTH!

  12. #12
    Join Date
    May 2008
    Location
    Jax Fl.
    Posts
    1,943
    Usually DX [direct expansion] refers to directly cooling the load [air] and chillers cool the intermediate or secondary refrigerant [brine] in most instances.

  13. #13
    Join Date
    Aug 2000
    Location
    Austell, Ga.
    Posts
    1,296
    Many times I have tried to keep the suction pressure loaders on the E-compressor, modifying the various springs on the CNT-4,and as JRINJAX stated, you would need a RA pneumatic signal to the Lil' 1/8" pipe thread
    beside the adjusting slot cover nut to maintain a decent controlled temperature of CHW. If memory serves a 3psi/deg sensitivity worked quite well in the past.
    Personally, anything you can do to get away from that Hi-dollar 4-stage electric thermostat furnished will be an improvement....
    Ain't "None" of us as smart as "All" of us..

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