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  1. #1
    Join Date
    Jul 2002
    Location
    NorthEast
    Posts
    811

    Condenser water inline booster pumps

    I have a new site with a six story building.
    Water cooled units on each floor
    The Computer room A.C. (CRAC) units 2 - 3 tons each have
    Condenser water in line booster pumps coming off the main C,W,supply riser

    The new facilities manager wants to turn the booster pumps off and open the bypass
    to save electricity.
    One example he is using are two parallel 3/4 h.p. B&G pumps
    The strainers were removed from the pumps for over 6 months (water issue)
    He feels pumps are obsolete because there is no change in discharge pressure when they
    turn off the pumps.
    and the CRAC units continued to run without
    tripping out on High Head
    Although, they did trip out on High head this morning.
    I argue to him that
    1)All the booster pumps are necessary(why were they installed)
    2)Many buildings use them
    3) The two B&G pumps are probably damaged although they draw amps
    due to long running without strainers
    4)Booster pumps will provide some flow even if the 24/7/ main pumps shut down
    5)Flow can be present even if there is not a noticeable change in discharge pressure
    6) the pumps will keep the units running in the event of low water flow
    dirt strainers or clogged pipes

  2. #2
    Join Date
    Sep 2008
    Location
    Mesquite Tx.
    Posts
    369
    Do the main (building) pumps shut down at night? do they ever shut down? I am sure your pumps are there for redundancy. 3/4 hp pumps dont use much power. sooner or later you may regret removing the strainers.
    Nos operor non pensio volutabrum

  3. #3
    Join Date
    Jan 2009
    Location
    Central Iowa
    Posts
    213
    Check two things....
    1. The CRAC unit manufacturer's specifications on flow requirements for the units.
    2. The actual flow through the condensors. If there is not a flow station... put one in.
    This will tell you if the main pumps are keeping up with the unit's requirements. If they are not, the booster pumps need to be repaired and the strainers replaced. After that, the strainers need to be blown down and inspected on a regular basis. Also.. a 3/4hp booster is a big bad boy for one piece of equipment. Can you get by with a smaller, fractional horsepower booster?

    Hope this helps...

  4. #4
    HVAC CLOSED LOOP QUESTION: I have been playing around with this site for the past 20 minutes attempting to navigate to a place where I can post my question. I have to get back to work. Is there anyone who has experienced soluble iron content in a closed loop hvac unit that has clogged strainers in a multi unit complex?

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