Results 1 to 6 of 6
  1. #1
    Join Date
    Feb 2004
    Location
    Australia
    Posts
    286
    Rep Power
    21

    Dunham Bush Chiller



    I don't suppose anyone would have a wiring diagram on computer for a Dunham Bush Chiller ??

    Even the identification plate is missing from this one. All I know is it has 2 Refcomp compressors (I just rebuilt one of them) and have to change from star delta to part winding start,

    Cheers


    a problem shared is a problem halved

  2. #2
    LRAC's Avatar
    LRAC is offline Veteran Poster I am starting to push the Mods: of RE
    Join Date
    Sep 2006
    Location
    Midlands
    Posts
    453
    Rep Power
    18

    Re: Dunham Bush Chiller

    Hi Iceman007

    Try this site the electrical diagrams are always at the bottom of the PDF's

    http://www.dunham-bush.com/dls.html

    Converting to part wind shouldn't be a problem, you probably know this but what the hell. measure the resistance of the windings and check that 1 set of windings does not read higher than the other set if they do the compressor might be a 60/40 split, if they do read the same its a 50/50 split so it doesn't matter which set of windings activate first. As usual add a timer set to secounds to bring in the secound set of windings after the first has activated.Remove the third spare contactor and you should be ok, unless the secound set of windings try to start in the oposite direction?

    Kind regards
    Lrac
    Last edited by LRAC; 09-05-2007 at 08:21 PM.

  3. #3
    Join Date
    Aug 2006
    Location
    Canada
    Age
    61
    Posts
    150
    Rep Power
    18

    Re: Dunham Bush Chiller

    How do you make sure that it is not starting in the wrong direction?

    On a motor, where the shaft is visible, I would run the motor unloaded on one set of windings, then run it on the other set, and make certain that they are running in same direction. I am thinking that I would do the same thing on a compressor, only this would require pulling the head. Is there another way?

    I have never seen a motor with 2 sets of windings, where they were not the same? 60/40 split? Didnt know that you could buy that. I am not sure if that will make a big difference...but am thinking that I would want to start on the 60% winding first.

  4. #4
    LRAC's Avatar
    LRAC is offline Veteran Poster I am starting to push the Mods: of RE
    Join Date
    Sep 2006
    Location
    Midlands
    Posts
    453
    Rep Power
    18

    Re: Dunham Bush Chiller

    Quote Originally Posted by Sledge View Post
    How do you make sure that it is not starting in the wrong direction?

    I have never seen a motor with 2 sets of windings, where they were not the same? 60/40 split? Didnt know that you could buy that. I am not sure if that will make a big difference...but am thinking that I would want to start on the 60% winding first.
    Hi Sledge follow the link below and download the compressor field guide it has quite a lot if info that explains partwind compressors.
    http://www.thermagroup.com/compressors.php

    Kind regards
    Lrac

  5. #5
    Join Date
    Aug 2006
    Location
    Canada
    Age
    61
    Posts
    150
    Rep Power
    18

    Re: Dunham Bush Chiller

    Quote Originally Posted by LRAC View Post
    Hi Sledge follow the link below and download the compressor field guide it has quite a lot if info that explains partwind compressors.
    http://www.thermagroup.com/compressors.php

    Kind regards
    Lrac

    Great link, Didnt realize there were so many compressor manufacturers.

    Thanks

  6. #6
    Join Date
    Feb 2004
    Location
    Australia
    Posts
    286
    Rep Power
    21

    Re: Dunham Bush Chiller

    Quote Originally Posted by LRAC View Post
    Hi Iceman007

    Try this site the electrical diagrams are always at the bottom of the PDF's

    http://www.dunham-bush.com/dls.html

    Converting to part wind shouldn't be a problem, you probably know this but what the hell. measure the resistance of the windings and check that 1 set of windings does not read higher than the other set if they do the compressor might be a 60/40 split, if they do read the same its a 50/50 split so it doesn't matter which set of windings activate first. As usual add a timer set to secounds to bring in the secound set of windings after the first has activated.Remove the third spare contactor and you should be ok, unless the secound set of windings try to start in the oposite direction?

    Kind regards
    Lrac
    It's a 50/50 motor. What I am doing is taking the timer down (to half a second or so). I can't do much with it until the BMS people have been out as there are problems enabling it. I will put the first timer into A1 on the first coil and take a lead from a set of contacts (normally open) through the time delay to the second contactor.

    Cheers
    a problem shared is a problem halved

Similar Threads

  1. Dunham Bush Chiller Alarm
    By Regulator in forum Air Conditioning
    Replies: 11
    Last Post: 08-12-2010, 02:42 AM
  2. DIY aquarium chiller
    By BarraCuda in forum Technical Discussions
    Replies: 18
    Last Post: 06-10-2010, 11:02 PM
  3. Dunham Bush
    By frank in forum Air Conditioning
    Replies: 9
    Last Post: 03-09-2005, 05:38 PM
  4. Dunham Bush Chillers
    By frank in forum Air Conditioning
    Replies: 14
    Last Post: 11-08-2002, 12:13 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •