chiller flow switch
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  1. #1
    Join Date
    Jan 2001
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    chiller flow switch

    I am working a system with a 3o ton trane chiller with 2 chilled water pumps in parrallel. It has a standard m&m paddle type flow switch on chilled water loop. The bas monitors pumps with current sensors and shuts off chiller call if no chw or cond pumps. The flow switch is part of the actual chiller control. We just replaced it several months ago. the switch failed today not so much a paddle issue. This chiller is very critical for a rare books area(humidty/temp control). My question what other options do I have that may be a little better more reliable. I understand I have seen this style flow switches 20 years old?? The customer is always trying to improve things. I was thinking diff pressure. also the pumps are on hand off auto switches.the way we are runnig them now is pump is on hand valve open while the backup pump is off with valve closed. we rotate bimonthly. I have suggested switching them automatically. thanks for your input.

  2. #2
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    Pressure differential on the chiller barrel or the pumps would work fine.

  3. #3
    Join Date
    Apr 2006
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    329
    Are you having nuisance trips on flow? Do you have low flow through the chiller? I had a chiller that the flow was at the low range of the chiller and sometimes was not enough to operate the flow switch. We also had a 3 way valve in the picture too, though. I think a DP is more accurate than a paddle.

  4. #4
    Join Date
    Jul 2010
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    What about efector flow switches? They are really reliable and easily calibrated.

  5. #5
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    Quote Originally Posted by joey94 View Post
    What about efector flow switches? They are really reliable and easily calibrated.
    my recommendation too. oh...never use a dp switch across a pump to prove flow...look at a pump curve chart...at 0 gpm you have maximum pressure differential.
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  6. #6
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    Jan 2001
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    The flow is within trane specs. Not really nuisance trip total switch failure. The switch was sweating that probably doesn't help. I looked at those flow sensors. I didn't see any on off control. I am surethey have them. Looks like high quality controls though

  7. #7
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    Quote Originally Posted by jayguy View Post
    my recommendation too. oh...never use a dp switch across a pump to prove flow...look at a pump curve chart...at 0 gpm you have maximum pressure differential.
    Your post is making me wonder why I see them ALL the time on the pump.

  8. #8
    Join Date
    Mar 2007
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    3,103
    For my money, IFM Efector is the way to go! I have lots of them installed and no failures yet! No moving parts, easy set up.
    "There is no greater inequality than the equal treatment of unequals."

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  9. #9
    Join Date
    Jun 2005
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    169
    Quote:
    Originally Posted by jayguy
    my recommendation too. oh...never use a dp switch across a pump to prove flow...look at a pump curve chart...at 0 gpm you have maximum pressure differential.


    Quote Originally Posted by y7turbo View Post
    Your post is making me wonder why I see them ALL the time on the pump.
    Because JAYGUY scenario only happens if somebody CLOSED the shutoff discharge valve.
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  10. #10
    Join Date
    Aug 2009
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    Here's another vote for IFM Efector. Also, beware of putting DP switch outdoors (air-cooled chiller?). Small lines with no flow + low ambient temp = freeze damage on small line and loss of water. Also, Turbo, maybe they were put there by building controls guy for feedback on pump status? If so, hope they are not also using them for flow status. A running pump does not neccessarily mean flowing water.

  11. #11
    Join Date
    Feb 2011
    Location
    OH
    Posts
    149
    I HATE THOSE DP THEHY ALLWAYS PLUG EVEN CHILLED WATTER OR COOLING TOWER CONDENSING WATER ,EVEN ON FLUID COOLERS THEY ARE A PAIN LIKE THE PADDELS MYSELF.

  12. #12
    Join Date
    Jun 2013
    Location
    Phoenix Arizona
    Posts
    5
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    Last edited by jpsmith1cm; 06-27-2013 at 09:55 PM.

  13. #13
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    NukeTech

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