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Thread: filter changing

  1. #1
    Join Date
    Dec 2003
    Posts
    149
    I just started my first HVAC job a few months ago at the STL Zoo; a bunch of different equipment, Residential Split Systems, RTU's, Chillers, ect. Anyway, went to PM the penguin building, a very critical building, obviously. Two 180 ton York Chillers feeding Temptrol(Spelling?) AHU's. On the each of the AHU's there are gauges showing pressure drop across the filters. Today they were showing about .4 inches of water column. At what value would you change the filters? I opened the doors, and they didn't look too bad, they were dated 7/29, so it hasn't even been a month since they were changed. Thanks for the help, Adam.
    Still learning....

  2. #2
    Join Date
    Aug 2004
    Location
    chicago
    Posts
    123
    i cant remember what we changed are filters in a hotel i used to work, in critical systems i would say going by the water column is better, the chief at the hotel wasnt very helpful at times allthough he knew a lot, i tink he looked at as if i wanted to know to find out on my own, he just told me to change them once a month thats the way weve been doing for the last 10 years

  3. #3
    Join Date
    Jul 2001
    Posts
    40
    Generally speaking, keep pressure drop across filters at less than 1.0 inch of water column...

  4. #4
    Join Date
    Sep 2003
    Posts
    3
    A good rule of thumb is to record the initial clean filter pressure drop, then change when the drop doubles. Most pre-filter manufacturers do limit maximum drop to less than 1" WG total, as umd has stated. HEPA filters are another story.

    [Edited by fused on 08-20-2004 at 09:47 AM]

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