Page 2 of 3 FirstFirst 123 LastLast
Results 14 to 26 of 39

Thread: Trane 100 Ton

  1. #14
    Join Date
    Jun 2010
    Location
    U.A. (upper Alabama)
    Posts
    839
    Prob. a bad sensor. It will trip on this if the entering water reads colder than the leaving water (on front panel). Another possibility is that your flow switch is closed but you really dont have flow.

  2. #15
    Join Date
    Mar 2010
    Location
    Va.
    Posts
    180
    Quote Originally Posted by jayguy View Post
    the actual minimum pressure drop is 4.0 FEET OF WATER (about 1.73 psid) but i think that the REAL minimum is closer to 3-4 psid...sometimes i think trane allows the marketing department into the engineering department too much.
    Your right it is "ft of water" not psid. Not the first time if spoken without thinking first.

  3. #16
    Join Date
    Sep 2006
    Posts
    85
    replace your water temp sensors they come in a pair

  4. #17
    Join Date
    Sep 2008
    Location
    Delaware
    Posts
    243
    Lets think about compressor loading (or unloading).If something is not operating right with the slide valve and keeping it from completely unloading that could give a sudden temp drop in the water at SU. On the other hand a leak in the loading circuit may allow the compressor to load on SU as the HP rises. Check amp draw, pressures at SU ?

  5. #18
    Join Date
    Apr 2004
    Location
    Napoleon, Ohio
    Posts
    47
    I hooked up my first pressure gauge on the inlet side of the evaporator today and found that I had low pressure TO the evaporator from the water pump! I changed to the back-up water pump and now I have 20 PSI at the entrance and barely 1 PSI at the exit.

    I looked at the chart in the book and found that we are running a higher GPM pump than what we need, but knowing that the delta P should be acceptable.

    It still wonder about the internal design of the evaporator. It is strange that Circuit 1 would work, but not circuit 2.

    Does anyone have a "cut-away" diagram of the evaporator that they could post?

    I appreciate all of the input. Hopefully this is the end of the problem and there aren't any issues in the next day or two.

  6. #19
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,271
    from a Trane bulletin...

    the baffles do not go all the way across and cut off water flow. they go about 2/3 of the way.
    Attached Files Attached Files
    my 1st time jumping out of a plane...http://youtu.be/Kv38G0MHsGo

  7. #20
    Join Date
    Feb 2010
    Location
    MEXICO
    Posts
    467
    give me your email, I send the photo of the evaporator before assembly

  8. #21
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,029
    Has this evaporater ever seen "hot water " temps over 125degrees F will deform the plastic baffles and the heat transfer goes for a S?&$ and your evap temps will take a dive .
    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 .

  9. #22
    Join Date
    Feb 2010
    Location
    MEXICO
    Posts
    467
    I have my profile photo trane evaporator

  10. #23
    Join Date
    Aug 2009
    Location
    Prattville, Alabama
    Posts
    1,998
    Longtime lurker here; sds, I see in your first statement you mention automotive plant. Is this chiller on an open sump? Is there an open tank somewhere in the chilled water system, or any other way for process debris or material to get in the chill water? If so, the chiller barrel could be acting as a strainer and be clogged up with that material. This would affect water flow rate and heat transfer. Flow decreases and pressure drop increases ( think of shutting a valve ). Heat transfer decreases due to insulating effect of material on tubes and maybe even covering some tubes and preventing water from flowing over them. This could also happen if there have been recent additions or repairs made to chill water system and debris was introduced ( this is less likely to cause this much of a problem ). If this is not an open sump.... never mind . I would look at Graham's last post. I have never seen that , but from previous posts I wonder Graham has?

  11. #24
    Join Date
    Feb 2010
    Location
    MEXICO
    Posts
    467
    I open my trane evaporator and metal baffles are both European and American (ertab, ertwb, RTAA)

  12. #25
    Join Date
    Mar 2010
    Location
    Va.
    Posts
    180
    20# entering pressure sounds low to me. Where are your pumps located in relation to the chiller? How many floors is the building? Have you checked the water makeup to make sure it's working? Did you use the same pressure gauge for the entering and leaving pressure readings?

  13. #26
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,029
    I open my trane evaporator and metal baffles are both European and American (ertab, ertwb, RTAA)


    Read page 120 of the IOM it clearly states that the evaporator is constructed using steel. copper and POLYPROPYLENE components .
    Last time I checked polypropylene was a plastic unless I was absent from science class that day ????
    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 .

Page 2 of 3 FirstFirst 123 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