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  1. #1
    Join Date
    Jun 2011
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    chiller barrel dp

    Have a problem with low dp across barrel, dp switch wont make to start chiller. pump pressures 75lbs discharge 13lbs suction. only 4lbs dp at barrel, 5 story building. aaon chiller. found gycol pump not operational. pumped glycol in system with aux. pump suction side of pump went from 2lbs to 13lbs. still no change in dp across barrel. any ideas ?

  2. #2
    Join Date
    Jun 2011
    Location
    Baltimore,MD
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    If the pump isnt passing enough water then the dP will be down.
    Use the same guage on both inlet and outlet.
    What is the Chiller design GPM and Pump Design GPM
    Is the 4' the required minimum DP, or the design DP?

  3. #3
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,620
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    What's your dp and GPM supposed to be? Where is the pump in relation to the building and chiller? What is the design head of the pump? At what GPM? You're makin' 143 ft of head (+) across the pump now (assuming your readings are correct). That's a fairly stout pump if this is nothing but a commercial a/c application or something of the sort.

  4. #4
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
    Posts
    11,471
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    Is the chiller actually measuring DP via transducers or the like to determine if there's enough flow? Or is there a separate flow switch? Reason I ask is if so, could be something fouling the transducer, causing it to read low. Transducer itself could be reading low (if that is what the machine has).

    Have you used a separate gauge to measure delta P...are there PT plugs on the inlet and outlet piping for this purpose?
    Building Physics Rule #1: Hot flows to cold.


    Building Physics Rule #2:
    Higher air pressure moves toward lower air pressure


    Building Physics Rule #3:
    Higher moisture concentration moves toward lower moisture concentration.

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