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  1. #1
    Join Date
    Feb 2012
    Posts
    24

    stumped! and not too proud to admit it

    i have an issue that has me baffled for the first time in years....
    any help would be greatly appreciated.
    split system 2 ton.... evaporator is and old apollo hydro unit
    no problem with the hydronic heat...

    anyway....replaced condensing unit ( dead comp )
    triple vac'd
    held vacuum overnight.

    charged unit by weight.r22

    turned system on. all should be well...but not

    evap has hisssing sound and unit runs 49psi low and 178 high

    added a few oz r22. pressures rise and then fall to exact as before

    my question is.... is it possible to only have a leak in one direction? ( positive pressure )

    or do i have another issue?

    again.... any help would be greatly appreciated

  2. #2
    Join Date
    Jan 2008
    Location
    In the work truck
    Posts
    2,990
    Are you in the trade? Is there someone at work you can ask for help?

    Pressures alone are not going to help us figure out your problem. How old is the evaporator? Txv or piston? Is the hydronic coil a separate coil or one coil with both water and DX? How many CFM are your moving across your air handler.. These are the questions you need answers to, to begin troubleshooting. THere are more but I won't ask them now..

    Unfortunately, We can't go into too much detail in an open forum. Good luck.
    Gotta have the right tool for the job!

    Where is all the stuff MADE IN THE USA?

    "Thats what we do Troy. Incredible, Invisible, Imbelivable things. We are an Unseen, Unknown, Unvincible fraternity of craftsman.."

  3. #3
    Join Date
    Feb 2012
    Posts
    24
    evap is probably 15 years old...;piston( installed new piston w/ condens unit). and separate coils. air blows like the wind.... no need to measure cfm.

    and yes i am in the trade. nccr & aces cert 10 yrs exp.

  4. #4
    Join Date
    Dec 2008
    Location
    Buffalo NY
    Posts
    3,078
    Coil is to old for your new condenser. You have a mismatch.


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  5. #5
    Join Date
    Jan 2008
    Location
    In the work truck
    Posts
    2,990
    Since when is wind a measurement in HVAC? I must have missed that..The wind is blowing slowly here today!

    I don't know what them certifications are but THey don't teach you to insure proper airflow before charging equipment?

    IF you would like you can get your post count up and apply for Pro Membership but that is not going to help you right now.

    Good luck your going to need it
    Gotta have the right tool for the job!

    Where is all the stuff MADE IN THE USA?

    "Thats what we do Troy. Incredible, Invisible, Imbelivable things. We are an Unseen, Unknown, Unvincible fraternity of craftsman.."

  6. #6
    Join Date
    Feb 2012
    Location
    Toronto Canada
    Posts
    1,090
    CFM= can't f ing matter she blows like the wind.

    Go easy on the guy he has problems lol

  7. #7
    Join Date
    Feb 2012
    Posts
    24
    qwerty hvac.... i know it's old... but i have replaced condensing units for this property owner in the past, with no problems. i am not asking for anyone's diagnosis@pascone 10
    i was just curious if it was possible to have a leak in one direction and not the other.

  8. #8
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,007
    Aren't all leaks one direction?

  9. #9
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,381
    Quote Originally Posted by philstanley1 View Post
    i was just curious if it was possible to have a leak in one direction and not the other.
    What exactly do you mean by that question?

  10. #10
    Join Date
    Feb 2012
    Posts
    24
    is it possible to have a leak in positive pressure but not negative (vacuum)

  11. #11
    Join Date
    Jan 2009
    Location
    Etters PA.
    Posts
    499
    Quote Originally Posted by SBKold View Post
    Aren't all leaks one direction?
    not if the comp. is running the system in a vac. and the leek is on the low side.

    And to answer your ? with a ? how can a system under pressure only leak in one direction. I believe you may be just having a brain fart momment.

  12. #12
    Join Date
    Jan 2008
    Location
    In the work truck
    Posts
    2,990
    There is more pressure in the tubing with say nitrogen then in a vacuum. The leak should be more noticeable the higher the pressure as compared to a vacuum.
    Gotta have the right tool for the job!

    Where is all the stuff MADE IN THE USA?

    "Thats what we do Troy. Incredible, Invisible, Imbelivable things. We are an Unseen, Unknown, Unvincible fraternity of craftsman.."

  13. #13
    Join Date
    Jan 2008
    Location
    In the work truck
    Posts
    2,990
    Why are you worried about a leak? Do you think it is leaking out of there as fast as your putting it in? Then stops leaking when your pressures are 49/178???
    Gotta have the right tool for the job!

    Where is all the stuff MADE IN THE USA?

    "Thats what we do Troy. Incredible, Invisible, Imbelivable things. We are an Unseen, Unknown, Unvincible fraternity of craftsman.."

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