Page 2 of 6 FirstFirst 123456 LastLast
Results 14 to 26 of 78
  1. #14
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,096
    CVHA ,PCV same chiller different control panel . Sounds like a similar situation to the one I had .Get the engineered conversion guys from Trane to help you out you .They will be able to tell you how low you can take the tonnage down and how the chiller will perform at low loads. I really would avoid the multistack the customer and you will regret it . We have customers with 15yr old multistacks that are being torn out to got to the bone yard so they can install a real chiller again .
    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 .

  2. #15
    Join Date
    Jul 2008
    Location
    Edmonton Alberta Canada
    Posts
    89
    Lol... our local trane reps told us using multistacks was the way to go.

  3. #16
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,096
    Obviously a sales guy not a service minded guy . Like the other guys said good commision .!!!!!
    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 .

  4. #17
    Join Date
    Jan 2004
    Posts
    1,176
    You need to rename the post, HAS ANYONE HAD A GOOD EXPERIENCE USING MULTISTACK TRANE MODULAR CHILLERS.
    Federal Reserve, stealing your kids futures since 1913

    UA290

  5. #18
    Join Date
    Sep 2008
    Location
    Texas
    Posts
    371
    Quote Originally Posted by Paulinator View Post
    Lol... our local trane reps told us using multistacks was the way to go.
    Sounds like that would be your local NEW EQUIP sales guy. Your local service sales guy would love to convert that CVHA to 123. If they decide to keep the old chiller they need to eddy-current test the tubes before coverting and I would have them pull the insulation off of the evap shell as these machines are bad about rusting through the shell. If the shell is pitted it can be sand blasted and coated with an epoxy and re-insulated.
    "Dying aint much, its living thats hard." (Josey Whales)

  6. #19
    Join Date
    Apr 2006
    Location
    Motel 6.5
    Posts
    148
    The only bigger POS is an Aire Stack!

  7. #20
    Join Date
    Jul 2008
    Location
    Edmonton Alberta Canada
    Posts
    89
    Yea i've got the strainers covered. I am going to use a self cleaning filter that purges when differential pressure across the filter is greater than a specified value. The cleaning cycle lasts about 20 seconds, in this process the condenser water loop loses water, but there is an automatic make up on it so were fine. It's just a matter of piping the waste line somewhere.

  8. #21
    Join Date
    Jan 2004
    Posts
    1,176
    Whatever you think you have covered, you don't. If you don't want to install a closed loop cooling tower than you will always have problems. It doesn't matter what or how many strainers you install because the junkstack strainers are finer and if you install finer mesh ones ahead of them than you will be cleaning them everyday.
    Federal Reserve, stealing your kids futures since 1913

    UA290

  9. #22
    Join Date
    Dec 2003
    Location
    45th Parallel
    Posts
    957
    Quote Originally Posted by Paulinator View Post
    Yea i've got the strainers covered. I am going to use a self cleaning filter that purges when differential pressure across the filter is greater than a specified value. The cleaning cycle lasts about 20 seconds, in this process the condenser water loop loses water, but there is an automatic make up on it so were fine. It's just a matter of piping the waste line somewhere.

    If it is basically a wye strainer with a solenoid valve to blow down, well, good luck with that.
    If you were filtering out marbles that may work, but I have never seen a blowdown alone be able to clean a filter that has cottonwood, and other small debris that likes to get hung up in the strainer holes. You may end up losing a whole Sh** load of water trying.
    Usually you have to remove the screen from housing and spend some time at the slop sink cleaning.
    Let us know how this works out for you.

  10. #23
    Join Date
    Jul 2008
    Location
    Edmonton Alberta Canada
    Posts
    89
    I will definitely keep you guys posted on how this works out. The filter i am using is a specialty filter from AMIAD filtration systems. We are capable of filtering from 800 to 10 microns ( i have not gone into the details yet, as i still need to meet with the client with my proposed solution).

  11. #24
    Join Date
    Mar 2004
    Location
    midwest
    Posts
    959
    Here is the deal, if you have good water and clean tower loop with a good strainer they run good. If not they are nightmares and do require a good chemical cleaning annually. Customers often get miss led because its new...Had quite a few compressors go bad, heat exchanger ruptures, etc.

    Again good clean water is the key. my 2 cent opinion.
    An astronaut stuck in space was asked by a reporter, "How do you feel?"
    "How would you feel," the astronaut replied, "if you were stuck here, on top of 20,000 parts each one supplied by the lowest bidder?"

    "do it right or do it twice"

  12. #25
    Join Date
    Mar 2003
    Posts
    7,326
    While I agree that the multistack has been very maintenance heavy, and has caused many, many contractors heartache just hearing the name, it really sounds like the lad has his mind made up. There are other options, but whatever. On a seperate note, I heard recently that multi was going to switch to shell and tube design due to the lousy reputation of their products in the past, but have no verification of that yet. The good news is that he will be creating manhours for some contractor, hopefully one that knows better than to offer full maintenance on these crappy machines. The bad news is that he is stubborn enough to not listen to good advice, and may get a bad rap himself for specifying this heap.

  13. #26
    Join Date
    Jul 2008
    Location
    Edmonton Alberta Canada
    Posts
    89
    So, the thing is.... I am only the junior here asking for some food for thought. I have spoken to the senior engineer here who is signing and stamping the drawings about this post and he feels confident in this design. If it was me running the show, i might take a second look at other options like Klove was speaking about. Since i am not running the show, the only thing i can do is voice my opinion and let him make the ultimate decision.

Page 2 of 6 FirstFirst 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