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Thread: superheat

  1. #1
    Join Date
    May 2004
    Posts
    23
    ok how do you find out what the proper superheat should be.
    senerio outside temp 86 indoor wet bulb 58 indoor dry bulb 72.

  2. #2
    Senior Tech Guest
    Go to the "For your interest" section. Read up on superheat and subcool and then come back with your questions.

  3. #3
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,939
    Originally posted by 25skeet
    ok how do you find out what the proper superheat should be.
    senerio outside temp 86 indoor wet bulb 58 indoor dry bulb 72.
    What? I will save this one for Norm.
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  4. #4
    Join Date
    Dec 2002
    Posts
    174

    go to...

    ...the supply house and buy a slide rule calculator...Trane makes a good one

  5. #5
    Join Date
    May 2004
    Posts
    23

    slide rule calc

    none of the supply houses here in great falls mt have them i have been trying to find one online but cant. Can I get one direct from trane?

  6. #6
    Check the equipment spec sheets... they will give you a chart for the different types of metering devices.

    Some will even go further with SP, LP, Amps, SH, SC, etc, etc...

  7. #7
    Join Date
    Apr 2004
    Posts
    395

    Hmm

    There is a guy on ebay that sells Carrier charts for like 15 bucks. I have a SH-31 and never using it.Its good for P/M work. Or as a learning tool, But you cant beat a good thermometer and a Temp Clamp. I carry a Fieldpiece thermometer and a Fluke line clamp in my tool bag fits nicey nice in bag. If you got a Fluke 16 they work well for line temps as well.

    [Edited by fitter638nyc on 06-23-2005 at 03:36 AM]
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  8. #8
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,903
    Originally posted by 25skeet
    ok how do you find out what the proper superheat should be.
    senerio outside temp 86 indoor wet bulb 58 indoor dry bulb 72.
    58 x 3 = 174

    174 - 80 = 94

    94 - 86 = 14

    14 / 2 = 7

    7° super heat for your senario.
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  9. #9
    Join Date
    Apr 2002
    Location
    Omaha, NE
    Posts
    1,561

    Re: slide rule calc

    Originally posted by 25skeet
    none of the supply houses here in great falls mt have them i have been trying to find one online but cant. Can I get one direct from trane?
    Yes, you can order them directly from Trane or Carrier, but there is a minimum order of $25 plus shipping & tax. It gets rather expensive for just one.

    Here's a source with a minimum order of $10, but you can meet that by buying an R-22 slide-chart and an R-410A slide-chart, plus shipping of course.

    http://www.123supply.com/clearspec.html

    If you just want a simple chart that uses indoor WB and outdoor DB then look here:

    http://www.rhvactools.com/
    and click on "A/C supherheat card"


  10. #10
    Join Date
    Sep 2002
    Location
    South Dakota
    Posts
    6,579

    I see you are in Great Falls. Go to the Johnstone Supply there and ask them for one. They are a Coleman supplier and Coleman has such a slide rule. I have several.

    Coleman has them for both R22 and 410A.

    Norm


  11. #11
    Join Date
    May 2004
    Posts
    23
    Great thanks I will get one from johnstone.

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