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  1. #1
    Join Date
    Oct 2010
    Location
    oklahoma city
    Posts
    61

    how to warm up a centrifugal

    I need to do an oil change on a CVHE. There is no hot water available near the chillers, so I need to find a portable water heater solution to warm the barrel. Preferably without taking 6 hours. Anyone have a piece of equipment they recommend? I think a propane heater would work the best, as the only power sources nearby are 120v or feeds equipment. Thanks.

  2. #2
    Join Date
    Sep 2007
    Location
    Somewhere in the world.
    Posts
    1,618
    http://www.westsidewholesale.com/plu...osch-rp7p.html

    You could mabey use some thing like this just a thought.
    Arguing with your Boss is like wrestling with a pig in
    mud.
    After a while you realize that while you are getting
    dirty, the pig is actually enjoying it.

    It is not exactly cheating, I prefer to consider it
    creative problem solving.

    25 years ago we had Bob Hope , Steve Jobs , and Johnny Cash today we have no Hope no Jobs and no Cash !
    I can fix broke but i can't fix stupid !

  3. #3
    Join Date
    Mar 2007
    Posts
    3,140
    You don't need to pressurize a low pressure chiller to do an oil change. You can do it in about 30 minutes with the machine in a vacuum if you've got the right tools.
    The key to happiness is lower expectations.

  4. #4
    Join Date
    Jul 2007
    Location
    The Hot South
    Posts
    1,374
    Quote Originally Posted by Tech Rob View Post
    You don't need to pressurize a low pressure chiller to do an oil change. You can do it in about 30 minutes with the machine in a vacuum if you've got the right tools.
    AGREED!

    I have never heated up a low pressure chiller to do an oil change and it takes me 30 minutes with minimal tools.

  5. #5
    Join Date
    Sep 2007
    Location
    Somewhere in the world.
    Posts
    1,618
    The real simple way is to start the machine get it down to 45 deg. chw nice vacumm shut it down and work on it. You need to be quick about it.
    Arguing with your Boss is like wrestling with a pig in
    mud.
    After a while you realize that while you are getting
    dirty, the pig is actually enjoying it.

    It is not exactly cheating, I prefer to consider it
    creative problem solving.

    25 years ago we had Bob Hope , Steve Jobs , and Johnny Cash today we have no Hope no Jobs and no Cash !
    I can fix broke but i can't fix stupid !

  6. #6
    Join Date
    Feb 2006
    Location
    Float'N Vally, MS
    Posts
    1,879
    Quote Originally Posted by bluke1 View Post
    How do you warm up a chiller

    Kiss it gently and tell her how much you love her.

    Life is too short, Behappy!
    TFMM

  7. #7
    Join Date
    Mar 2007
    Posts
    3,140
    One of the guys who used to come on this board had a 123 refrigerant drum that he converted to a vacuum chamber with isolation valves on the inlet and outlet. He would evacuate the drum to a pressure lower than the chiller, open the isolation valve, and it would suck the oil right out of the chiller. Use the vacuum in the chiller to draw the new oil in.
    The key to happiness is lower expectations.

  8. #8
    Join Date
    Sep 2007
    Location
    Somewhere in the world.
    Posts
    1,618
    Invest in a good gear pump and your troubles will be over.
    Arguing with your Boss is like wrestling with a pig in
    mud.
    After a while you realize that while you are getting
    dirty, the pig is actually enjoying it.

    It is not exactly cheating, I prefer to consider it
    creative problem solving.

    25 years ago we had Bob Hope , Steve Jobs , and Johnny Cash today we have no Hope no Jobs and no Cash !
    I can fix broke but i can't fix stupid !

  9. #9
    Join Date
    Aug 2009
    Location
    Prattville, Alabama
    Posts
    2,145
    Quote Originally Posted by york56 View Post
    Invest in a good gear pump and your troubles will be over.
    +1.

  10. #10
    Join Date
    Jul 2007
    Location
    The Hot South
    Posts
    1,374
    We also use an oil transfer pump.

  11. #11
    Join Date
    Jan 2005
    Location
    Houston TX
    Posts
    880
    bluke1 - Okay here it is, no hot water generation needed only 120 volt outlet. From the sump valve on the oil tank connect a 1/2" refrigerant hose to a gear pump inlet side with a check valve on the discharge side to prevent back flow. Leave the sump valve closed at this point. Install a line from the check valve outlet with a sight glass on the end and connect to a vacuum pump, if you have any ball valves that would help. Start the vacuum pump and once the vacuum drops below the level of the sump pressure open the sump valve and watch for oil moving to the sight glass. Valve off the sight glass, shut off the vacuum pump and start the gear pump and drain your 7 gallons into a 100 # refrigerant can (now a waste oil drum) . This doesn't take long, but once your pump looses prime your done. Your can either suck the new oil in or valve off the sump and reverse the gear pump and pump the oil back in the sump. Just remember to purge the air out of the connection at the oil sump before opening that valve. I always pump the oil in as I know I won't get air in the sump. Good luck- 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

  12. #12
    Join Date
    Oct 2010
    Location
    oklahoma city
    Posts
    61
    Thanks for the advice. I have researched the question before I asked here. The local trane office told me that their method was to warm the chiller. I have searched gear pumps, but most seemed too large, high gpm. Can anyone be specific on the manuf. and model of the pump you are using?

  13. #13
    Join Date
    Jan 2005
    Location
    Houston TX
    Posts
    880
    bluke- You don't need a high dollar hydraulic oil pump, I have a 1/2 hp, 120volt pump that came from W.W,Grainger. Yes, it is preferable to heat the entire vessel up as then you can also do a leak check. bluke please remember though you ask for advice and got it. The guys on hvac-talk.com have years of experience doing this and have been in your situation long before we had this easy method of getting professional advice. I have almost 30 years myself and I still request information from others. Like the man said "Ain't none of us as smart as all of us". I am a professional technician in training and will be for years to come. Good luck -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

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