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  1. #1
    Join Date
    Aug 2007
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    Atlanta
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    Loss of Freon When Checking Subcooling Superheat ??

    When a technician is testing the charge level or subcooling or superheat, and is using gauges with hoses that are several feet long, how much Freon is lost from filling up the hoses? Should the technician have a canister of Freon with him to replace what is lost when he completes his system check? Thanks.

  2. #2
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    Aug 2004
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    Kentucky, Michigan, Ohio, Arizona, Colorado, Nevada, and Califormia
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    If the hoses have low loss fittings like most of ours do, the loss is minimal and would take several thousand "checks" before affecting performance.

  3. #3
    Join Date
    Jul 2001
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    VA
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    Fair question

    With low loss fittings and proper techniques you won't lose enough to make a difference with regular service. Should they put more in just because they hooked up? No. The amount you are talking about is not readily measurable, so all they would do is screw the charge up.
    ___________________________________________


  4. #4
    Join Date
    Jan 2004
    Location
    PA
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    Should he have a jug of gas in the truck yes.

    Should he try to put .25 oz. back in, no. ( presuming low lose fittings )
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    How many times must one fix something before it is fixed?

  5. #5
    Join Date
    Nov 2005
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    1,350
    Be careful, many of the techs on this site and many in the field use one set of gauges for all residential refrigerant types. Which means they dump the charges on their gauges after each use. If your system is near critical and the tech has 6 foot hoses it could affect system performance.
    I STARTED WITH NOTHING, AND I STILL HAVE MOST OF IT!

  6. #6
    Join Date
    May 2004
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    12,294
    Quote Originally Posted by emoney1971 View Post
    Be careful, many of the techs on this site and many in the field use one set of gauges for all residential refrigerant types. Which means they dump the charges on their gauges after each use. If your system is near critical and the tech has 6 foot hoses it could affect system performance.

    (cough)

    Bull****

    Please explain to this group what you mean by "critical charge" on a residential unit and how loosing less than on ounce of refrigerant will matter.

  7. #7
    Join Date
    Jul 2001
    Location
    VA
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    critical charge .....resi AC....... naahhhhhh

    besides..... most resi guys do not dump the hose charge between calls, they deal primarily with just a few refrigerants and have a set for each.
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  8. #8
    Join Date
    Jul 2000
    Location
    Northern Wisconsin
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    2,040
    Quote Originally Posted by emoney1971 View Post
    Be careful, many of the techs on this site and many in the field use one set of gauges for all residential refrigerant types. Which means they dump the charges on their gauges after each use. If your system is near critical and the tech has 6 foot hoses it could affect system performance.
    I dump the charge from my hoses after every check. Matter of fact I disconnect from the high side of the equipment first, open the high side of the guage to the crossover and then slowly open the low side of the guage to the crossover. IE: I put what liquid I took out of the system right back in. The only thing thing left in my guage set when im done is whatever gas it'll hold at the pressure of the low side. Anyone ever measured how much that is? Oh........ I run 5' hoses if someone is going to do the measurement.
    Use the biggest hammer you like, pounding a square peg into a round hole does not equal a proper fit.

  9. #9
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    Sep 2006
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    Southern California
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    86
    diminimus

  10. #10
    Join Date
    Jul 2001
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    VA
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    Yeah firecontrol.... I think every good tech does that.... I was just saying that you would not vent the hoses to atmosphere between calls.
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  11. #11
    Join Date
    Jun 2003
    Location
    Florida
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    Quote Originally Posted by firecontrol View Post
    I dump the charge from my hoses after every check. Matter of fact I disconnect from the high side of the equipment first, open the high side of the guage to the crossover and then slowly open the low side of the guage to the crossover. IE: I put what liquid I took out of the system right back in. The only thing thing left in my guage set when im done is whatever gas it'll hold at the pressure of the low side. Anyone ever measured how much that is? Oh........ I run 5' hoses if someone is going to do the measurement.

    I pre-charge my gauge hose set before I hook them up.......




















    yeah,yeah, that's the ticket.

    Actually I don't.
    If everything was always done "by the book"....the book would never change.

  12. #12
    Join Date
    Dec 2002
    Location
    Houston,Tx.
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    16,122
    Quote Originally Posted by GAHomeOwner View Post
    When a technician is testing the charge level or subcooling or superheat, and is using gauges with hoses that are several feet long, how much Freon is lost from filling up the hoses? Should the technician have a canister of Freon with him to replace what is lost when he completes his system check? Thanks.

    O God! how to folks get so bored? I wished I had time to worry about stuff like that,
    heck with my busy life that would be like meditation to me.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  13. #13
    Join Date
    Aug 2003
    Location
    Fort Worth, TX
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    11,376
    Quote Originally Posted by Mr Bill View Post
    O God! how to folks get so bored? I wished I had time to worry about stuff like that,
    heck with my busy life that would be like meditation to me.
    A similar thought crossed my mind...

    ...interesting what questions get asked in this section at times.

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