Page 1 of 6 123456 LastLast
Results 1 to 13 of 78
  1. #1
    Join Date
    Jul 2008
    Location
    Edmonton Alberta Canada
    Posts
    89

    Anybody have bad experience with Multistack (Trane) Modular Chillers?

    I got hired to do consulting on an existing office tower in my city. Chiller is up in penthouse and I am going to provide the client with modular chillers because they can fit in the elevator and up the stairs. I was wondering if anyone has ever had any experience with these machines and if it was a good or bad experience. Thanks!

  2. #2
    Join Date
    Nov 2008
    Posts
    366
    My office sells and services quite a few.

    They seem to be as good as anthing else (short of a centravac), and are particularly suited for the situation that you describe.

  3. #3
    Join Date
    Dec 2003
    Location
    45th Parallel
    Posts
    957
    My personal opinion is, use them only as a last resort.
    They are a maint. nightmare.
    They will generate a lot of work for a service shop, but as an owner you will probably be sorry.
    Fouled heat exchangers(plate frame), lack of accessibility to replace txv powerheads, etc, etc,.
    They are not a very efficient unit.

    I would take apart a centrifugal piece by piece before I would put those in my building.

    Oh, by the way, they are NOT a Trane Product. Trane sells them, but they are not made by Trane.
    Salesman love them cuz they get higher commision on them. Not sure why but they do.

  4. #4
    Join Date
    Jul 2008
    Location
    Edmonton Alberta Canada
    Posts
    89
    I'm installing a filter on the condenser water supply to avoid any pine needles/debris from entering. Thanks for your input guys!

  5. #5
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,093
    They dont call them MULTICRAP for nothing . They are the worst POS ever to reside in a mechanical room . Nothing but poorly designed cheap crap, service nightmare !!!!
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage
    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 .

  6. #6
    Join Date
    Aug 2000
    Location
    USA
    Posts
    4,995
    LOL, that DOES NOT WORK. Ive seen the inline filters, filters on the towers, etc. Same problem, by the end of the cooling season, the end modules are tripping off on head pressure. A real nitemare to clean. JMHO
    Quote Originally Posted by Paulinator View Post
    I'm installing a filter on the condenser water supply to avoid any pine needles/debris from entering. Thanks for your input guys!
    Your poor planning does not constitute an emergency on my part!!!!

  7. #7
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,093
    Paulinator .. type in multistack in the keyword search and see what the guys on here think of them ????
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage
    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. #8
    Join Date
    Jul 2008
    Location
    Edmonton Alberta Canada
    Posts
    89
    Looks like lots of people hate these suckers, and a few people don't have problems with them. I don't really have any other options. The roof is full of piping everywhere, we do not have helicopters available, cutting a hole in the roof or wall is nearly impossible...

    They've got an old R-11 centravac in there now, its way oversized. I redid the load calculations and it was half of what the original centravac was. Their problem is chiller cycling, and with the multistacks i can have them cycle down to a really low cooling load. I am still confident that this is the best option.

  9. #9
    Join Date
    Nov 2008
    Posts
    366
    My knowledge of these is not first hand. My office does sell alot of them but our recip. dept. services them. I have never worked on one myself but the recip. guys say that they like them.

    If you don't like plate and frame you will not like the new small tonnage air cooled from trane(although it is in the chw).

    If the shells are still good on the centravac we do alot of turbocore retrofits and again I don't personally work on them but the recip. guys like that option as well.
    They tell me that 2 guys can carry a 100 ton comp. up the stairs.

    I know that they just did one on about a 350 ton Carrier screw that was oversized and used 3 or 4 comps. and they tell me that it worked out great.

  10. #10
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,093
    What kind of Trane centravac is it , look into the possibility of converting the chiller to
    R123 and cutting back the wheels to drop the tonnage ????
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage
    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 .

  11. #11
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,093
    I had a customer with an old PCV 3 with hot gas bypass on it . It was way oversized and an energy hog, we did an engineered conversion ,removed the hot gas bypass ,put a CH531control package on it and had the wheels cut back to drop the tonnage to 180 from 300. Chiller now purrs like a kitten and the customer loves it and no major changes in the mech room except for the ventilation for the R123 .
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage
    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 .

  12. #12
    Join Date
    Jul 2008
    Location
    Edmonton Alberta Canada
    Posts
    89
    Trane model CVHA (A means comes assembled). 362 Tons design capacity. Did cooling load calcs, and im at 200 Tons. I am going to propose to the client we change the centravac to R-123, add in emergency ventilation, and add one 70 Ton scroll multistack with a pump. The only drawback is that the old centravac will still cycle on/off, but i will be able to capture the shoulder season cooling demands. If the client doesn't bite i'll be scraping the centravac and intalling three multistacks.

  13. #13
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,611
    Depending on what capacity you need, have you considered small tonnage water cooled screws? It's kind of a pain, but you can take them all to pieces and put them in a freight or regular elevator. I know the York YWSC goes up to around 240TR, don't know on the Trane RTW, but either one in multiple machines will fill the bill and give you redundancy.

    On the filter issue - I, too, have seen full flow filters on applications like this. Strainers on your condenser pumps is one thing, but if you're doing actual filters, you better think about duplexing them, or you may have a lot of sleepless nights during cooling season.

Page 1 of 6 123456 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event