Results 1 to 10 of 10
  1. #1
    Join Date
    Sep 2008
    Location
    usa
    Posts
    27
    Rep Power
    0

    filter dryer changing?



    i had a guy giggle and tell me i was crazy because i didnt change filter on a large 50 ton R22 system every year. I was always under the impression not to change filter/dryer unless you opened the system for repaire.

    i havent been to school for a long time, maybe they teach something new now? or maybe i slept through that part of the class, it was over 10 years ago so i may have forgot ???



  2. #2
    Join Date
    Oct 2008
    Location
    mallorca, spain,
    Age
    69
    Posts
    771
    Rep Power
    13

    Re: filter dryer changing?

    hi kirt,
    well I agree with you , that is unless you have a moisture prob , or an acid oil prob ,
    carry on as you are = sedgy ,

  3. #3
    Join Date
    May 2007
    Location
    Auckland
    Age
    67
    Posts
    3,362
    Rep Power
    31

    Re: filter dryer changing?

    Be pro-active and change driers annually, why wait for a problem to develop and sell the recovery costs to client, who is going to look like and incompetent idiot. I have enough hassles now without creating more down the track.
    magoo

  4. #4
    Join Date
    Dec 2008
    Location
    Portugal
    Age
    41
    Posts
    1,039
    Rep Power
    12

    Re: filter dryer changing?

    If the moisture sight glass is green; if the filter is clean no significant pressure loss is created the liquid temperature after the filter is the same (no liquid expansion) Why change the filter drier?...unless of course the system be open.
    To make progress is never good enough, I want to do better and better and better

  5. #5
    Join Date
    Jul 2001
    Location
    Sydney, Australia
    Posts
    764
    Rep Power
    19

    Re: filter dryer changing?

    I see no compelling reasons to go changing them for the sake of it
    ...and she said "give it to me you big fridgie"

  6. #6
    Join Date
    Dec 2010
    Location
    ZA
    Posts
    157
    Rep Power
    9

    Re: filter dryer changing?

    Changing them annually in a working system with no moisture, no leaks and no other oil issues is not needed. You might do it every 5 years along with changing the compressor oil though. Most systems have no drier, no oil changes and operate for many years ( unless made down to a price point and using cheap copper pipe and fins) with no problems.

  7. #7
    Join Date
    Mar 2012
    Location
    italy
    Age
    60
    Posts
    75
    Rep Power
    6

    Re: filter dryer changing?

    hello
    I agree with colleghiche precede me, I think that changing a filter for no reason is a waste of energy and money ........... only advantage is to provide work to the disadvantage of the client.

  8. #8
    Join Date
    May 2010
    Location
    ipswich
    Age
    25
    Posts
    26
    Rep Power
    0

    Re: filter dryer changing?

    I agree with magoo... better to be safe then sorry. A small yearly fee or a potetionaly expensive repair?

  9. #9
    Join Date
    Apr 2007
    Location
    england
    Age
    29
    Posts
    372
    Rep Power
    16

    Re: filter dryer changing?

    Quote Originally Posted by jakabus View Post
    I agree with magoo... better to be safe then sorry. A small yearly fee or a potetionaly expensive repair?
    Agreed, but the cost of things is just going up and up, the accountants cheque book getting tighter!


  10. #10
    Join Date
    Sep 2007
    Location
    Somerset
    Age
    63
    Posts
    4,465
    Rep Power
    38

    Re: filter dryer changing?

    Hi Kurt.

    My answer to your question, contains all of the above.
    Simply put the frequency of filter change depends upon several factors.

    The first to consider is the type of filter fitted, meaning if it's the solid core type which has the bolted end-plate.
    Are usually the type that are more frequently changed not least because of the size of system they relate to.
    Yes historically they were changed every year and still should be if the comps are being serviced at the same time.
    If the system in question is not disturbed and has no filter related issues.
    Then provided there is no discernible temp diff across them.
    I look for the temp diff across them to be in low single figures when you get to say a 4 to 6c split.type then they definitely need replacing.
    Others say any temperature diff across the filter then they should be replaced.

    What a lot of the guys are saying which makes absolute sense, with the smaller systems that have the brazed in-line liquid filters.
    They rarely ever need changing which is true. Sometimes you only end up changing them because their rusty bodies are giving concern!
    In fairness the larger the system the more likely the liquid line filters will need more frequent changing.
    When you get to industrial sized plant then a regular maintenance schedule makes most sense.

    At 50T duty it's all down to your site knowledge of usage and issues.
    To make decision as to what option to take.
    Just remember prevention is better than Cure!
    Grizzly

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •