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  1. #1
    Join Date
    Jun 2009
    Location
    Florida
    Posts
    540

    UCP2 chilled water setpoint

    Anyone ever have a problem with the chilled water setpoint pot on a ucp1 going screwy and drifting off setpoint? I have one under contract that seems to be doing it, but I haven't caught it yet. The plant operator says he has seen the setpoint up as high as 60 when scrolling through the menu and then by just touching the knob, it drops right back to 45 and the chiller starts. Never any diagnostic, it's just the ucp1 "seeing" no cooling required and off cycling. Also one time, it apparently crashed when he switched from hold to auto on the vane control. Don't know if that's related, it may have been coincidental that the setpoint happened to drift passed the diff to stop setpoint at that moment. When I look at it, it will never do it. I can raise and lower setpoint and the display shows it being exactly where it should be for the knob position. I'm thinking just some contact cleaner might help it out. Any thoughts? When this starts to happen, is it just a matter of time before having to replace the 1U3 mod?
    I've had to replace them when they fail internally before, just never seen this type of failure.
    Last edited by ChillerWisperer; 09-29-2009 at 07:55 PM. Reason: Brain fart
    Low Pressure Forever!

    If you know heavy metal, you can work anywhere-Dave Andreson

    Anchors Aweigh my boys, Anchors Aweigh!
    Farewell to foreign shores, We sail at break of day. Through our last night on shore, Drink to the foam. Until we meet once more. Here's wishing you a happy voyage home!

  2. #2
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,610
    There's a knob on a UCP2?

  3. #3
    Join Date
    Jun 2009
    Location
    Florida
    Posts
    540
    Quote Originally Posted by klove View Post
    There's a knob on a UCP2?
    ucp2...did I say ucp2

    Yep...sorry. I meant ucp1.

    Had ucp2 on the brain because I was thinking of another machine I was working on today.
    Low Pressure Forever!

    If you know heavy metal, you can work anywhere-Dave Andreson

    Anchors Aweigh my boys, Anchors Aweigh!
    Farewell to foreign shores, We sail at break of day. Through our last night on shore, Drink to the foam. Until we meet once more. Here's wishing you a happy voyage home!

  4. #4
    Join Date
    Oct 2006
    Location
    Central Texas
    Posts
    634
    UCP695. Assuming the sensor is good, try doing a power supply check out 1U2, verify 1U3 ops. CVHE-SB-22A should help. Hope this can help.
    Sic Semper Tyrannis.

  5. #5
    Join Date
    Jun 2009
    Location
    Florida
    Posts
    540
    Quote Originally Posted by txhvac View Post
    UCP695. Assuming the sensor is good, try doing a power supply check out 1U2, verify 1U3 ops. CVHE-SB-22A should help. Hope this can help.
    Sensor appears to be good. Reading is spot on in ice water. I just pulled up SB-22 and was reading through it.
    Low Pressure Forever!

    If you know heavy metal, you can work anywhere-Dave Andreson

    Anchors Aweigh my boys, Anchors Aweigh!
    Farewell to foreign shores, We sail at break of day. Through our last night on shore, Drink to the foam. Until we meet once more. Here's wishing you a happy voyage home!

  6. #6
    Join Date
    Dec 2003
    Location
    45th Parallel
    Posts
    954
    Sounds like a dirty POT like Graham said.
    I have had pretty good luck getting them to work properly by turning them rapidly from limit to limit about 8-10 times.
    Usually works. There is likey some lint or dust built up in the POT and that is all it takes to clear it.
    Cheaper than replacing the whole Mod-.

  7. #7
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,064
    Sounds like a dirty pot to me . How do you plan to replace the 1U3 mod after December 31st 09??? Unless you have a spare already .
    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. #8
    Join Date
    Jun 2009
    Location
    Florida
    Posts
    540
    Quote Originally Posted by graham View Post
    Sounds like a dirty pot to me . How do you plan to replace the 1U3 mod after December 31st 09??? Unless you have a spare already .
    That's why I was wondering if I should just go ahead and replace it while it is still available.
    Low Pressure Forever!

    If you know heavy metal, you can work anywhere-Dave Andreson

    Anchors Aweigh my boys, Anchors Aweigh!
    Farewell to foreign shores, We sail at break of day. Through our last night on shore, Drink to the foam. Until we meet once more. Here's wishing you a happy voyage home!

  9. #9
    Join Date
    Nov 2008
    Posts
    366
    Quote Originally Posted by ChillerWisperer View Post
    That's why I was wondering if I should just go ahead and replace it while it is still available.
    Hey whisper I went to one doing the exact same thing to day.

    Ordered an new 1U3 board. As of this afternoon Trane had 5 in stock.

  10. #10
    Join Date
    Nov 2004
    Location
    North Florida/South Georgia
    Posts
    988

    Opportunity is knocking

    MCS controls can custom make you a panel with a graphic display for far le$$ than you probably would think.
    All my leon freaked out!

  11. #11
    Join Date
    Jun 2009
    Location
    Lawng Eyeland
    Posts
    97
    how much?

  12. #12
    Join Date
    Nov 2008
    Posts
    366
    Quote Originally Posted by chiller mekanik View Post
    MCS controls can custom make you a panel with a graphic display for far le$$ than you probably would think.
    As far as I know Trane supports the stuff they sell for 20 years or more.

    Are you sure that the company that you speak of will do the same.

    I checked out their website and they have only been in business since 1994.
    The question I have is will they still be around and supporting their flavor of the week in 20 years.

  13. #13
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    2,064
    Theres a complete UCP1 control on e-bay for sale . Brand new
    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 .

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