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  1. #1
    Join Date
    Dec 2011
    Location
    Australia
    Posts
    53

    Trane E series unloaders

    What is the best way to control the three capacity control solenoids on a trane e series compressor. I have one to fit and after some options.

  2. #2
    Join Date
    Feb 2006
    Location
    SouthEastern Virginia
    Posts
    1,075
    I recommend suction pressure using 3psig increment. Example(R-22) Suction pressure target is 70, suction pressure falls to 67 then unload. Suction pressure increases to 73 then load.
    It might get loud!

  3. #3
    Join Date
    May 2000
    Location
    Stafford, Va. USA
    Posts
    212
    Hi Redback,
    What is currently controlling the loading and unloading.
    Are you cooling air or water?

    To load and unload that compressor by suction pressure now, you would need to change the handhole cover where the loader solenoids are.

    If you use the existing loader solenoids, you could use a Honeywell W7100 for air or a Honeywell W7900 for water.

    Good Luck,
    Allen
    UA Local 602
    A man who says that he can't learn anything in a class is exactly right.

  4. #4
    Join Date
    Jul 2006
    Location
    Anytown USA
    Posts
    2,043
    Quote Originally Posted by Allen View Post
    Hi Redback,
    What is currently controlling the loading and unloading.
    Are you cooling air or water?

    To load and unload that compressor by suction pressure now, you would need to change the handhole cover where the loader solenoids are.

    If you use the existing loader solenoids, you could use a Honeywell W7100 for air or a Honeywell W7900 for water.

    Good Luck,
    Allen
    No need to change the handhole cover, you can just use pressure switches to energize the electric solenoids. We have many set up this way..

    To do by temperature you can also use one of the Honeywell T775 controllers. I forget the exact model number of the controller, but they work well too.

  5. #5
    Join Date
    Jan 2005
    Location
    Houston TX
    Posts
    866

    A reminder

    Redback- Model "E" solenoids energize to load, de-energize to unload-GEO
    Once in a while everything falls into place and I am able to move forward, most of the time it just falls all over the place and I can't go anywhere-GEO

  6. #6
    Join Date
    Dec 2011
    Location
    Australia
    Posts
    53
    The compressor is cooling air in more than one air handling unit, each air handling unit has a liquid line solenoid coil and can shut down depending on zone temp for that air handler.

    I checked the specs on a renco pressure control and has a minimum diff of 9psi a penn control minimum diff of 7psi, I would like to keep the SST between 30F and 41F on R407C but it would be difficut to set three pressure controls within such a tight range.

  7. #7
    Join Date
    Nov 2006
    Location
    U.S.A.
    Posts
    208
    If the AHs are constatnt volume, use the mechanical suction unloader plate, not the electrical unloaders.

    If a chiller or VAV AH, use electrical unloaders w/ discharge water/air controller.

  8. #8
    Join Date
    Dec 2004
    Location
    Chicago area
    Posts
    1,438
    Quote Originally Posted by redback View Post
    The compressor is cooling air in more than one air handling unit, each air handling unit has a liquid line solenoid coil and can shut down depending on zone temp for that air handler.

    I checked the specs on a renco pressure control and has a minimum diff of 9psi a penn control minimum diff of 7psi, I would like to keep the SST between 30F and 41F on R407C but it would be difficut to set three pressure controls within such a tight range.
    Use a T775 with an analog input and 3 digital outputs. Get a pressure transducer to tee into the suction line to send the analog signal to the T775.

    Or just use three different pressure controls, and dial them in on install.

  9. #9
    Join Date
    Nov 2004
    Location
    Chicago, Illinois
    Posts
    17
    I agree with softtail - Use the mechanical unloading plate and dial in. These compressors with the mechanical unloading work great and trouble free.

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