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  1. #1
    Join Date
    Jun 2009
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    Florida
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    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 08:55 PM. Reason: Brain fart
    Low Pressure Forever!

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  2. #2
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    Dec 2008
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    Dixiana, AL
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    There's a knob on a UCP2?

  3. #3
    Join Date
    Jun 2009
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    Florida
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    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
    Mar 2004
    Location
    ottawa canada
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    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 toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage
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  5. #5
    Join Date
    Oct 2006
    Location
    Central Texas
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    649
    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.

  6. #6
    Join Date
    Mar 2004
    Location
    ottawa canada
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    2,110
    Theres a complete UCP1 control on e-bay for sale . Brand new
    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 .

  7. #7
    Join Date
    Jun 2009
    Location
    Florida
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    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!

  8. #8
    Join Date
    Jun 2009
    Location
    Florida
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    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!

  9. #9
    Join Date
    Dec 2003
    Location
    45th Parallel
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    957
    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-.

  10. #10
    Join Date
    May 2001
    Location
    Western Wa
    Posts
    1,864
    One trick I've seen operators do with a UCP2 is to think, by enabling a temperature reset,
    that they are resetting the fault holding the chiller out. Then I find it sitting there not loading up.

    Haven't seen one make changes on its own, though.
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  11. #11
    Join Date
    Aug 2009
    Location
    Seattle Area
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    58
    Quote Originally Posted by ChillerWisperer View Post
    Also one time, it apparently crashed when he switched from hold to auto on the vane control.
    Why is an operator messing with the manual vane control anyway? There's a problem all in its own! I love trying to figure something out based on information from a maintenance guy, but it never happens when you're there.

  12. #12
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    Jun 2009
    Location
    Florida
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    Quote Originally Posted by Randy S. View Post
    One trick I've seen operators do with a UCP2 is to think, by enabling a temperature reset,
    that they are resetting the fault holding the chiller out. Then I find it sitting there not loading up.

    Haven't seen one make changes on its own, though.

    It's a ucp1...sorry. See my earlier post correcting 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!

  13. #13
    Join Date
    Jun 2009
    Location
    Florida
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    Quote Originally Posted by NWMech View Post
    Why is an operator messing with the manual vane control anyway? There's a problem all in its own! I love trying to figure something out based on information from a maintenance guy, but it never happens when you're there.
    He was logging it and one of the readings he logs is evap ref temp, which can only be accessed through the servicemans menu. He's been around this machine since it was installed in '87, and is very familiar with it so I don't have a problem with him doing that. Most operators...well, I'd have to agree with you there.
    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!

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