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  1. #1
    Join Date
    Feb 2009
    Location
    Houston
    Posts
    13

    Recovering refrigerant from a chiller

    Just a question is it best to have the chill water pumps running while recovering refrigerant from a chiller

  2. #2
    Join Date
    Aug 2002
    Location
    Southold.calm
    Posts
    4,846
    Quote Originally Posted by uboatcmdr View Post
    Just a question is it best to have the chill water pumps running while recovering refrigerant from a chiller
    And CDWP
    Unless you like re-tubing!

  3. #3
    Join Date
    Feb 2009
    Location
    Houston
    Posts
    13
    Thank you thats what I thought...just sitting here watching the recovery machine run and second quessing myself. Pumps are on

  4. #4
    Join Date
    Mar 2004
    Location
    ottawa canada
    Posts
    1,844
    Depends if its a high or low pressure chiller.
    The 64 roars to life Whoo hoo ...shes a rolling chassis .
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    Best Austin Healey In Show twice in 2013 .....All those hrs paid off .

  5. #5
    Join Date
    Aug 2007
    Location
    Southern NJ
    Posts
    28
    The pumps should definitely be running during recovery. I have found the fastest way is to use the push-pull method and draw the liquid right off the bottom of the chiller barrel and into the drum. That will make quick work of it.

  6. #6
    Join Date
    Jul 2013
    Location
    Atlanta, GA
    Posts
    33
    You can also valve off and drain the water from the evaporator. It eliminates any possible pump problems if recovering vapor overnight.

  7. #7
    Join Date
    May 2009
    Location
    Calgary AB
    Posts
    42
    Quote Originally Posted by Otis201 View Post
    You can also valve off and drain the water from the evaporator. It eliminates any possible pump problems if recovering vapor overnight.
    Does not eliminatepump problems over night, if you have a blocked tube you'll still be retubing. How do you know that all the tubes are clear? x-ray vision? Always let remaining liquid boil out above the freezing temp of water when you're pulling vapor to be sure that you won't freeze anything up

  8. #8
    Join Date
    Jul 2013
    Location
    Atlanta, GA
    Posts
    33
    If you recovered liquid first doing push pull, any small amount of liquid remaining in the chiller should be well below the level of the tubes when your recovering vapor so I still think your safe. Done it many times with no issues.

  9. #9
    Join Date
    Jul 2013
    Location
    Atlanta, GA
    Posts
    33
    Factory does recommend running pumps though.

  10. #10
    Join Date
    Aug 2009
    Location
    Prattville, Alabama
    Posts
    1,737
    Quote Originally Posted by Otis201 View Post
    If you recovered liquid first doing push pull, any small amount of liquid remaining in the chiller should be well below the level of the tubes when your recovering vapor so I still think your safe. Done it many times with no issues.
    I've done this many times, too. Most always on a Trane. However, I've learned on this site that at least one other manufacturer has a chiller that traps liquid refrigerant in one of the barrels, at a level above the lower row(s) of tubes. The refrigerant trapped there can only be removed as vapor. I don't recall what the brand and model was, but hearing something like that sticks with you.

  11. #11
    Join Date
    Nov 2012
    Location
    Minnesota
    Posts
    34
    Frequently there is no way to run pumps, so you need to know how to remove charge safely with no pumps. I can't even remember the last time I had pumps available when I pulled charge. This is how its done, remove all liquid with push pull, pull down to just above freezing pressure, let sit overnight and check pressure in morning, should be well below ambient temp. converted to pressure. If there are no cold spots, there is no liquid and your good to continue.
    GB

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