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  1. #1
    Join Date
    Jan 2001
    Posts
    747

    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
    Join Date
    Jul 2006
    Location
    Anytown USA
    Posts
    2,044
    Pressure differential on the chiller barrel or the pumps would work fine.

  3. #3
    Join Date
    Apr 2006
    Posts
    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
    Posts
    56
    What about efector flow switches? They are really reliable and easily calibrated.

  5. #5
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,017
    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.
    It's tube brushing season...93% done (39.35 miles of tubing)...only 1,242 tubes to go!

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  6. #6
    Join Date
    Jan 2001
    Posts
    747
    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
    Join Date
    Jul 2006
    Location
    Anytown USA
    Posts
    2,044
    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
    Posts
    3,074
    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."

    -Thomas Jefferson

  9. #9
    Join Date
    Aug 2009
    Location
    Prattville, Alabama
    Posts
    1,771
    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.

  10. #10
    Join Date
    Jan 2001
    Posts
    747
    bergermech do you know what model you use. All I need is to send signal back to chiller to sense flow. look like high quality controls

  11. #11
    Join Date
    Oct 2001
    Posts
    6,858
    if you go differential mount the switch on the wall and pipe over to the taps the pump and water in the pipes willl make even more problems...if not on the walll...saw those resistance flow switches were they sense water flow and you set the sensitivity with the pumps on and then cycle for brake...saw them on a hostital York chiller MER job never again...swetting flow switch is always fun on the chiller side
    "when in doubt...jump it out" http://www.youtube.com/watch?v=Px5YcOeQB4I

  12. #12
    Join Date
    Mar 2007
    Posts
    3,074
    This is the stuff I use. These part numbers are from their website...

    SN0150 VS3000 controller
    EVC074 M12 angled connector
    E40174 clamp adapter
    SF6200 SFG flow sensor
    "There is no greater inequality than the equal treatment of unequals."

    -Thomas Jefferson

  13. #13
    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.

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