Results 1 to 8 of 8
  1. #1
    Join Date
    Aug 2014
    Location
    Ottawa, Ontario
    Posts
    3

    Multistack Maglev Chiller with Flexsys Control

    Have our first Maglev chiller, 250 Tons, 2 TT400 Compressors. Been having a lot of issues, not sure if it's due to system design. Inverter alarms/faults have been daily since startup. Don't have anything to compare to and was wondering for those of you that have this type of chiller what your expierences have been?

  2. #2
    Join Date
    Aug 2009
    Location
    Prattville, Alabama
    Posts
    2,065
    This thread would probably get a better response in a chiller forum.
    I don't have any experience on these.
    But, there are several guys here who have extensive experience, I believe.

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,074
    Moved to Chiller forum.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  4. #4
    Join Date
    Jun 2008
    Location
    Windsor, Ont.
    Posts
    500
    Have 3 of them down our way, running reliably and pretty much fault free. What type of inverter faults are you getting??

  5. #5
    Join Date
    Aug 2014
    Location
    Ottawa, Ontario
    Posts
    3
    We are getting inverter faults, motor bearing faults. This is a very small loop, with 2 ahu's and about half dozen fan coils. The manufacture is saying there is not enough thermal mass in the system. When we have a 20c+ ambient day, the chiller starts up, C1 will start and trip on inverter fault after a couple minutes, then C2 starts and is good for the day. This Flexsys controller is in command of the vfd's for the chilled and condenser pumps, the condenser and chilled water bypass valves and the tower fan. Whenever the outdoor ambient is 18 or below, the compressors cycle like crazy and the alarms and faults increase. The manufacture has done a ton of tweaking and things have improved a little. Again this is our first Flexsys Maglev so I was wondering how these chillers our running elsewhere? Can you describe your system nyrb?

  6. #6
    Join Date
    Jun 2008
    Location
    Windsor, Ont.
    Posts
    500
    The systems we have run at fixed flow rates both chilled and condenser, one site has light load but generally once a compressor is on it stays on, and if it cycles periodically it's no big deal in my opinion. The inverter fault on C1 you are having would be my primary concern, is it "High Inverter Temperature" or what??

    I will add that most of our sites have TT300 compressors and a fair amount of time was dedicated by our people to set up the chiller to best match the site at various load conditions. It's easy to just blame the chiller, but most of the time external conditions are causing most of the headaches such as small loop volume etc.

  7. #7
    Join Date
    Aug 2014
    Location
    Ottawa, Ontario
    Posts
    3
    Yes high inverter temps. People are blaming the chiller but I agree with you, the chiller reacts to the conditions it's put in.

  8. #8
    Join Date
    Jun 2008
    Location
    Windsor, Ont.
    Posts
    500
    Hard to offer much guidance on a system with the limited information but the high inverter temps should be easy enough to trace out and that's where I would start as it seems to only happen with C1 from what you say.

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