Results 1 to 10 of 10
  1. #1
    Join Date
    Oct 2011
    Location
    Massachusetts
    Posts
    31

    Superheat and Subcooling

    Hey,
    I cant remember from last year but how do you know what your superheat and subcooling should be for 410a and R22 systems? Its been driving me nuts. Thanks guys

  2. #2
    Join Date
    Mar 2009
    Location
    Mount Holly, NC
    Posts
    3,131
    system data plate, or installation instructions.
    The TRUE highest cost system is the system not installed properly...
    The three big summer hearththrobs...
    Mel Gibson
    Dwane Johnson
    The A/C repairman

  3. #3
    Join Date
    Apr 2012
    Location
    Texas
    Posts
    196
    http://www.hvacfun.com/a-proper-resi...rg-methods.htm

    Most R-410A equipment utilizes TXVs and, therefore, you must charge them using subcooling. The recommended subcooling amount for R-410A is also 10 F to 15 F with a 3 F tolerance.

    The days of grabbing the suction line with one hand and your crotch with the other then closing the charging valve when the pressure is to much to bear, are over :-)

  4. #4
    Join Date
    Oct 2011
    Location
    Massachusetts
    Posts
    31
    On all new installs of 410a I run a QIV test for cool smart to make sure the refrigerant level, air flow, and voltages are all in an accetpable range. Thats exactly what they give you for a range. 3 degrees +\- the subcooling goal. They also want a superheat reading which i believe is +\- 5 or 7. The superheat goal is not on the nameplate like the subcooling. So I need to find out how to get the superheat goal. I think theres a chart out there I just need to find it. Thanks for the help

  5. #5
    Join Date
    Mar 2009
    Location
    Southeastern US
    Posts
    25

    Superheat Formula

    SH=(3*IWB-ODB-80)/2

  6. #6
    Join Date
    Dec 2006
    Location
    Goodyear, AZ
    Posts
    197
    You can download this book it has a superheat chart, its FREE

    http://shop.rdholder.com/Troubleshoo...leshooting.htm

    FREE articles on Superheat, Subcooling and A/C Troubleshooting. For the FREE downloading of the articles go to Book and Papers on HVAC on the main page, put them in to the cart then, you must click on the PRINT AND CALL button for payment at check out. This method allows me to process your downloading at NO CHARGE.

  7. #7
    Join Date
    Oct 2011
    Location
    Massachusetts
    Posts
    31
    I feel like that's a virus. Is that legit?

  8. #8
    Join Date
    Dec 2010
    Location
    Toronto
    Posts
    1,253
    Quote Originally Posted by Dennis.Moore View Post
    http://www.hvacfun.com/a-proper-resi...rg-methods.htm

    Most R-410A equipment utilizes TXVs and, therefore, you must charge them using subcooling. The recommended subcooling amount for R-410A is also 10 F to 15 F with a 3 F tolerance.

    The days of grabbing the suction line with one hand and your crotch with the other then closing the charging valve when the pressure is to much to bear, are over :-)
    Sorry Dennis but I had too,

    http://www.youtube.com/watch?v=qLkhx0eqK5w

  9. #9
    Join Date
    Apr 2012
    Location
    Texas
    Posts
    196
    Quote Originally Posted by SolarMike View Post
    Sorry Dennis but I had too,

    http://www.youtube.com/watch?v=qLkhx0eqK5w
    Your life or your lupines!This monetary redistribution concept is more difficult than I had imagined.

  10. #10
    Join Date
    Dec 2010
    Location
    Toronto
    Posts
    1,253
    Dennis Moore, Dennis Moore, steels from the rich and gives to the poor......lupines

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event