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  1. #1
    Join Date
    Dec 2012
    Posts
    7

    r-22 mcquay chiller

    I'm new at working on chillers. I 'm working on an older Mcquay high pressure chiller that has no Freon in it. Some of the guys say there is a leak in the evaporator barrel. There is water running through the barrel. Will water get into the refrigerate system. I'm willing to learn teach me.

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,776
    Moved to chillers forum.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  3. #3
    Join Date
    Jan 2005
    Location
    Houston TX
    Posts
    873
    While I can appreciate your wanting to learn chillers " Baptism by fire" at this point is not the time or place to do it. There are far too many variables to deal with in your case. The best educational idea I can give you is to call a well seasoned tech, stand back and take good notes. -GEO
    Once in a while everything falls into place and I am able to move forward, most of the time it just falls all over the place and I can't go anywhere-GEO

  4. #4
    Join Date
    Jul 2008
    Location
    Metro Atlanta
    Posts
    70
    To answer your question directly, water will only enter the refrigerant circuit if the pressure on the water side is greater than the pressure on the refrigerant side. If the refrigerant has completely leaked out, water has likely made its way in there. Like GA1279 said, there are MANY things to consider here. An eddy current needs to be done to determine the integrity of the tubes in the evap barrel. You can plug tubes if they are compromised, any then leak check the system again. You'll likely have to change the oil in the compressor, im assuming they are old recipe, and then evacuate the system to remove the rest of the moisture. This will be expensive for the customer, make sure you have the resources before taking on a job like this one.

  5. #5
    Join Date
    Aug 2009
    Location
    Prattville, Alabama
    Posts
    1,997
    I can't help but wonder why "some of the guys" aren't teaching you. Are they not experienced on chillers, either?

  6. #6
    Join Date
    Oct 2005
    Location
    Phoenix, Arizona
    Posts
    353
    Quote Originally Posted by hvac1973 View Post
    I'm new at working on chillers. I 'm working on an older Mcquay high pressure chiller that has no Freon in it. Some of the guys say there is a leak in the evaporator barrel. There is water running through the barrel. Will water get into the refrigerate system. I'm willing to learn teach me.
    You can start by looking for the I.O.M. for the chiller so you can get somewhat familiar with what your looking at , but like already stated you might want to get someone with more experience with chillers and ask ask ask questions. Good Luck buddy.
    RTFM!!!

  7. #7
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,307
    Are "those guys" that say evap is leaking guessing? I would put nitrogen in and leak search before I assume chiller barrel is leaking. How long has the chiller been down?

  8. #8
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,594
    Quote Originally Posted by socotech View Post
    Are "those guys" that say evap is leaking guessing? I would put nitrogen in and leak search before I assume chiller barrel is leaking. How long has the chiller been down?
    Ya do a leak test before assuming anything. You also didn't give us a model number either so we know what kind of evaporator we're talking about...

  9. #9
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,269
    Quote Originally Posted by hvac1973 View Post
    ...I'm willing to learn teach me.
    i am willing to teach...but you need to reply back when you are being taught.
    my 1st time jumping out of a plane...http://youtu.be/Kv38G0MHsGo

  10. #10
    Join Date
    Dec 2012
    Posts
    7

    Confused

    sorry guys for not getting back faster. found a leak at sight glass made repair. about the leak in the evap. barrel. I leak checked with nitrogen 100 psig for one hour. no drop in pressure. pulled vacuum down to 700 micron let set over night raised back to 730 micron the next morning. get me on the right track PLEASE.

  11. #11
    Join Date
    Apr 2012
    Location
    winnipeg
    Posts
    1,330
    the right track is learning before you go into action..... hope all worked out for you....
    it was working.... played with it.... now its broke.... whats the going hourly rate for HVAC repair

  12. #12
    Join Date
    Oct 2005
    Location
    Phoenix, Arizona
    Posts
    353
    U should try to pull the circuit down below 500 microns. If u can't get it below 500 u might have leak or contamination in the system. How big is the chiller or the circuit u are working on ?
    RTFM!!!

  13. #13
    Join Date
    Aug 2006
    Location
    Mixing oil and fire with a big spoon.
    Posts
    4,269
    Quote Originally Posted by manny238 View Post
    U should try to pull the circuit down below 500 microns...
    agreed. go lower. below 500 microns is better but lower is best. lower and holding is an even better proof to a non leaking system. keep in mind that some things leak under a vacuum and some things leak under pressure so continue to leak check. since this is a unit that has had a lot of issues, you need to keep going until you checked everything several times and then several times again.
    my 1st time jumping out of a plane...http://youtu.be/Kv38G0MHsGo

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