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  1. #40
    Join Date
    Nov 2002
    Location
    NJ - WORK IN NYC AREA
    Posts
    1,456

    Cool

    I have work on Multi's since they first arrived her in NYC.
    Never had problems with their operations.

    However, as stated in other posts, " closed cond loop!" or you will have problems.
    "My hands are for sale"

  2. #41
    Join Date
    Jul 2007
    Location
    The Hot South
    Posts
    1,316
    Check out the RTWD

  3. #42
    All right guys, I am doing a middle school. Multi stack chillers and open cooling towers. What do you guys think.

  4. #43
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,610
    Quote Originally Posted by pipefitter fred View Post
    All right guys, I am doing a middle school. Multi stack chillers and open cooling towers. What do you guys think.
    I believe that if you read this thread, you'll get the answer to your question without having to make everyone repeat themselves.

  5. #44
    Join Date
    Mar 2008
    Posts
    64
    Quote Originally Posted by pipefitter fred View Post
    All right guys, I am doing a middle school. Multi stack chillers and open cooling towers. What do you guys think.
    Not to worry, there are items to discuss.

    For us, we are closed loop, so that pretty well removes that as a concern, though the Clima Cool (which I am not endorsing, though it is on the list due to its features) it has the back-flush feature, as well as optional filters, so for a reasonably clean system, that should make it a non issue.

    From the reports, you would be much better off using a heat exchanger to keep the Multi Stack isolated, and from the comments, shell and tube rather than brazed plate. Maybe even dual.

    I do have a brazed plate heat exchanger isolating a primary non glycol system from a secondary glycol loop. The water is not treated on the primary side (Boilers) and we do have some gunk in the secondary side, and have had no issues with it blocking up.

    That said, given a new system, you would be better off going with the higher success rate of shell and tube in a possibly questionable application (i.e. eliminate as many of the possible problems as you can).

  6. #45
    Join Date
    May 2001
    Location
    Western Wa
    Posts
    1,837
    Quote Originally Posted by pipefitter fred View Post
    All right guys, I am doing a middle school. Multi stack chillers and open cooling towers. What do you guys think.
    I think you are nuts.
    God Bless our Veterans

    God Bless the USA

  7. #46
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,057
    .........Hello ......Hellllooooooo ........ anybody home ?????????????? did you not read the post . Repeat after me ....... Multistack is junk ....... POS ...... never ever install one and if you really really must used a closed tower.
    The 64 roars to life Whoo hoo ...shes a rolling chassis .
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    Best Austin Healey In Show twice in 2013 .....All those hrs paid off .

  8. #47
    Join Date
    Jul 2008
    Location
    Washington, DC
    Posts
    1,582
    Anyone ever seen the multistack screw? Incredibly quiet, I was really surprised when I started one up. This was in 2001, I guess they still make them. Otherwise, I have to agree, they are maintenance intensive.

  9. #48
    Quote Originally Posted by RC20 View Post
    Not to worry, there are items to discuss.

    For us, we are closed loop, so that pretty well removes that as a concern, though the Clima Cool (which I am not endorsing, though it is on the list due to its features) it has the back-flush feature, as well as optional filters, so for a reasonably clean system, that should make it a non issue.

    From the reports, you would be much better off using a heat exchanger to keep the Multi Stack isolated, and from the comments, shell and tube rather than brazed plate. Maybe even dual.

    I do have a brazed plate heat exchanger isolating a primary non glycol system from a secondary glycol loop. The water is not treated on the primary side (Boilers) and we do have some gunk in the secondary side, and have had no issues with it blocking up.

    That said, given a new system, you would be better off going with the higher success rate of shell and tube in a possibly questionable application (i.e. eliminate as many of the possible problems as you can).
    The multi stack is already in place and started up buy Trane about 6 weeks ago. Two ruptured heat exchangers already. Sand filter on system that fiters sub micron. Water looks clear, but when pulling down chiller to get to heat exchanger, red thick slim in the strainers. Just on a fact finding mission.

  10. #49
    Join Date
    Jan 2004
    Posts
    1,175
    You know , I am sorry, but I can't do anything but laugh.
    Federal Reserve, stealing your kids futures since 1913

    UA290

  11. #50
    Join Date
    May 2001
    Location
    Western Wa
    Posts
    1,837
    Sand filters make very good incubators.

    What are you running for a biocide?
    God Bless our Veterans

    God Bless the USA

  12. #51
    Join Date
    Dec 2003
    Location
    45th Parallel
    Posts
    954

    http://en.wikipedia.org/wiki/Caveat_emptor


  13. #52
    Join Date
    Mar 2008
    Posts
    64
    Quote Originally Posted by directman View Post
    Might want to have a look at a Smardt Chiller using the Turbocor oilless compressor. They come in compact and fit in the elevator just like the Multi crap. Use R134A and are more efficient than a screw and since they don't have any oil in the system you won't have to worry about oil loss or loss of efficiency due to oil in the ref. Comp draws less than 5 amps on start up due to liquid cooled VFD on the motor and it gets its best efficiency at part load conditions where most chillers run most of the time. Most importantly it uses shell and tube cond and evap so no problem with cleaning or keeping clean as per the multi crap and its plate heat exchangers.
    I would not touch a VFD driven device unless the mfg discuses what they have done to stop the bearing arching in their literature. While some will argue, my experience is that all new VFDs destroys bearings, its just a matter of how soon.

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