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  1. #1
    Join Date
    May 2012
    Location
    AUSTRALIA
    Age
    27
    Posts
    53
    Rep Power
    6

    superheat hvac buddy



    hi guys,
    just recently, I bought a HVAC buddy app. but i feel some thing is wrong.
    to calculate superheat , i plugged in 60 psi suction presure for r22 and suction line temp at 7 deg celcius. and the answer was -11.8 actual superheat .

    If i would have done it on paper i would do suction line temp 7 deg celcius -60 psi(1 deg celcius)= 6 deg superheat. however app tels me -11.8 actual superheat. sorry i can't get it

    please explain what is wrong been done by me.

    Thanks



  2. #2
    Join Date
    Aug 2009
    Location
    New Zealand
    Age
    53
    Posts
    2,556
    Rep Power
    20

    Re: superheat hvac buddy

    are sure your calculated superheat is in C and F

  3. #3
    Join Date
    Aug 2001
    Location
    Gold Coast, Australia
    Posts
    601
    Rep Power
    22

    Re: superheat hvac buddy

    Mad Fridgie may be into seething there. The app cannot accept mixed imperial & metric values. Or alternatives either - eg you can't use Bar instead of kPa.

    The other thing is: HVACBuddy is doing some calculations taking into effect all the data that you have input.
    If you play around with the RA wet bulb or the condenser air-on temps you'll see the results change.
    I believe that they're trying to be more scientific than simply subtracting SST from SPT.
    I find the app somewhat confusing to be honest. And sometimes the diagnostic advice conflicts with the law or just good practice. Remember it's American and they have different working practices & laws there. As I understand it, you can still use R12 there, for example.
    Last edited by FreezerGeezer; 27-11-2013 at 11:07 AM.

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