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  1. #1
    Join Date
    Aug 2006
    Location
    Vancouver , Canada
    Posts
    297

    Carrier 30HXC Oil filter change

    Greetings:

    I have a 30HXC126 on site that is ' new to me ' and has over 3,000 hours on it.

    Oil pressure is sketchy at times, I am pretty sure the internal and external oil filters have never been changed ( paint is not disturbed and records are non -existant ) - The manual states the internal filters should be changed @ 200 -300 hrs.

    I have new internal and external filters, a manual, and have a question or two:

    It states when changing the external filter that ..... '' A quart of oil is typically what is removed during this process. ''

    The next couple paragraphs go on to detail the internal filter changeout etc., but there is no mention of replacing the quart removed. I also have new oil, and would prefer not to re-use POE; is there any advice from you guys for this procedure and best way to replace the oil - of course I have a hand pump, can slurp it in under vacuum etc.

    Any comments would be appreciated.

    Dave Beauchesne CM
    aka: Freonguy
    Superheat and subcooling tell it all !

  2. #2
    Join Date
    Feb 2003
    Location
    Wichita Ks
    Posts
    1,404
    dont worry about the oil and make sure you have the oring for the internal. before you change it what is the pressure drop on the internal? the external should not need changing. the internal may not need changing either.

  3. #3
    Join Date
    Oct 2006
    Location
    Central Texas
    Posts
    624
    Before you go changing the filter. What do you mean by sketchy oil pressure? Are you getting a high pressure drop alarm over 25 psid? Oil pressure minus condenser pressure. Low oil level? Low oil pressure? There are several different oil trips, what's your tower water temps? do you know if theres condenser regulating h20 valve. Check all your transducers, they all got schraders underneath them, put a brass tee on the port to check accuracy. Food for thought.
    Sic Semper Tyrannis.

  4. #4
    Join Date
    May 2008
    Location
    Central Pennsylvania
    Posts
    435
    Like Freonrick said, check the pressure drop. I think 10 psid sticks in my mind for the tolerence across the internal filter for a HXC. For the internal filter replacement you shouldn't loose much oil, maybe a cup or so. I would just run it fully loaded for an hour or so after you change the filter and add POE 220 as / if needed. A hand pump into the oil line service valve works fine.
    Last edited by chillerguy81; 01-28-2010 at 10:35 AM. Reason: ment cup not quart

  5. #5
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,667
    There is a way of changing the filters without loosing at most an ounce of oil . But I must say that if the oil filters have never been changed then that is a really good sign.
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  6. #6
    Join Date
    May 2008
    Location
    Central Pennsylvania
    Posts
    435
    Txhvac is correct, check all you pressure transducers and such, forgot to add that part.

  7. #7
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,667
    Quote Originally Posted by chillerguy81 View Post
    Like Freonrick said, check the pressure drop. I think 10 psid sticks in my mind for the tolerence across the internal filter for a HXC. For the internal filter replacement you shouldn't loose much oil, maybe a quart or so. I would just run it fully loaded for an hour or so after you change the filter and add POE 220 as / if needed. A hand pump into the oil line service valve works fine.
    I'm gonna guess 20-25 psi filter drop.
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  8. #8
    Join Date
    May 2008
    Location
    Central Pennsylvania
    Posts
    435
    Do tell TGL

    Oops you beat me typing, I ment for your filter changing method. I was just guessing for the pressure drop. I know it's in the IOM. I thought it was 10 psid internal and 20 or 25 psid external. I can check if anyone needs it for sure.

  9. #9
    Join Date
    Dec 2006
    Location
    phoenix
    Posts
    106
    Look up the FD pressure in the pressure menu for both compressors. FD is the internal filter pressure drop. 10 psid is normal and 25 psid will go into alarm. The external oil filters rarely need replacement, however internal oil filters almost always need changing before 5000 hours. I'd change the internal if the FD was close to 20 psid.
    Last edited by tunaguy; 01-28-2010 at 12:19 PM. Reason: Too technical and unsafe

  10. #10
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,667
    Tuna I must say that that sounds like too much work and pretty risky of maybe loosing a compressor that way.
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  11. #11
    Join Date
    Aug 2006
    Location
    Vancouver , Canada
    Posts
    297

    30 HXC oil

    Tuna et al:

    Wow !! From all the replies in less than 12 hours, there must be a bunch of Chiller guys just waiting to answer a post !

    Thanks for the info and insight - I am almost positive the internals havent been done; I will double check the readings - I have between 12 and 15 on the internal filters right now, so I will forge ahead and change them.

    This unit doesn't have a suction valve to the compressor, onlt a DSV - I am stuck with pumping the low side into the high side I guess - I will do it on the run with evap. flow - don't want to pop a tube now, do we ??

    Thanks again - will et you know how it went - -

    Freonguy
    Superheat and subcooling tell it all !

  12. #12
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,667
    You might want to read the manual about changing the filters. Then ad-lib from there , it's not as difficult as pumping out the cooler as some have implied!!!!
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

  13. #13
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,667
    Quote Originally Posted by chillerguy81 View Post
    Do tell TGL

    Oops you beat me typing, I ment for your filter changing method. I was just guessing for the pressure drop. I know it's in the IOM. I thought it was 10 psid internal and 20 or 25 psid external. I can check if anyone needs it for sure.
    I will PM my method to you when I get an opportunity .
    UA 100

    It takes three people to do anything around here. Two do the work, one explains to the crowd of people who showed up when they seen smoke and flames.

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