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  1. #1
    Join Date
    Jul 2019
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    Evacuating a flooded evaporator on a chiller barrel

    Hello all, first post here. I知 working on a Smardt(dumb) chiller with a flooded evap. This unit has two compressors with 2 chiller barrels that have the same water lines heading to all the air handlers. We had to recover all the freon out of one circuit to fix a freon leak, and left the other operating. I知 to the point now of pulling a vacuum, as nitro held at 145psi for four days. My question is with cold water still going thru this evacuated barrel, is there any chance of moisture building up inside. Thanks all

  2. #2
    Join Date
    Jan 2008
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    New Jersey
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    If there wasn't any moisture in the system you will be fine.

    Sent from my ASUS_P00J using Tapatalk

  3. #3
    Join Date
    Mar 2004
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    ottawa canada
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    Whats “Freon” ??
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage and yes it still gives me goosebumps
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    In the new big shop , greasin', oilin' . tweakin' n shinin' !!

  4. #4
    Join Date
    Nov 2011
    Location
    East Side
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    Water has to be in the refrigerant side to begin with.

    145 psi for 4 days isn稚 really a helpful test. Trace gas with pressure test close to low side factory test, and leak check with electronic and soap would tell you more.

  5. #5
    Join Date
    Apr 2016
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    Maryland
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    I would triple evacuate - breaking with nitrogen - to 1000K micons or less . I am not happy until I achieve 1000K or less . There is a site I work that has thier people witness a 24HR vacuum test before I place refrigerant into the repaired area . I am OK with that - LIABILITY and doubt non existent . I have repaired MANY YORK YTs and YKs along with Carrier 17FAs

  6. #6
    Join Date
    Aug 2006
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    Mixing oil and fire with a big spoon.
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    Quote Originally Posted by CHILLERSVCMAN View Post
    I would triple evacuate - breaking with nitrogen - to 1000K micons or less . I am not happy until I achieve 1000K or less...
    1000K? Isn稚 that 1 million microns?
    "Right" is not the same as "Wise".

    Don't step on my favorite part of the Constitution just to point out your favorite part.

  7. #7
    Join Date
    Apr 2016
    Location
    Maryland
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    ONE thousand

  8. #8
    Join Date
    Jan 2013
    Location
    United Kingdom
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    1k is a 1000


    Sent from my iPhone using Tapatalk

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  10. #9
    Join Date
    Jul 2009
    Location
    New Orleans
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    Cold water running through a heat exchanger with one side open the atmosphere could lead to quite a bit of water build. If the system was open just long enough to make a simple leak repair you should be ok. 145psi for 4 days is a good indication that your system is tight but 1000 microns for an hour would be better to prove the integrity of the system. You probably wouldn't get to 1K if you had any significant water in the system.

  11. #10
    Join Date
    Apr 2012
    Location
    So.Fl. & NYC
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    Hi Guys, yes a triple evacuation would be the order of the day. I致e had refrigerant leaks pull through to the evacuated portion of an evaporator before. From a running system on a dual evaporator. So evacuate and pressurize and do a quick leak check.

  12. #11
    Join Date
    Nov 2019
    Posts
    1
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    Hi
    What type for metering does flooded evap use?

  13. #12
    Join Date
    Jul 2009
    Location
    New Orleans
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    Flooded Metering

    Quote Originally Posted by Sako93 View Post
    Hi
    What type for metering does flooded evap use?
    It can be fixed orifice, variable orifice, float assembly, metering plate or expansion valve. Essentially anything that you can think of.

  14. #13
    Join Date
    Nov 2014
    Location
    Australia
    Posts
    127
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    Triple evac - less than 500 microns - good standing test - like 24hrs (is possible).

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