Analize This AC Preformance
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  1. #1
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    Arrow Analize This AC Preformance

    Do you ever work on your own stuff at home?? well I don't that often haha! I gotta say I have limited experience with Residential A/C. My system here at my place I don't think is doing that good of a job at cooling the place here, Yesterday it wouldn't even drop below 80*F where the stat is located, even with the temp outside yesterday around 85F and a bit of sun on 3 bigger windows with blinds closed it couldn't keep up. zoning issue maybe?

    I'm going to pass on some info and we'll see what you guys think about this contraption!

    R-22
    Unit: Carrier M#38CK01834 (1.5ton??)
    Coil: Custom Coils Inc. M#SA6979 (btu's ??)
    Air handler: Temp Mizer High Velocity M# HV-52H 650CFM
    Metering Device: Inline Orface

    Measured at Condensing Unit
    Suction: 67psi @ 42F(low superheat?)
    Liquid: 210psi @ 97F
    Condenser Air: 84F in, 95F out

    Evap Air: 78F return, 61F Supply

    Bristol pump M#H29B16UABCA OC 25
    241V at contactor, 5.3A(@67psi suction)

    Mike
    Sig removed by mod. G-Rated site

  2. #2
    Join Date
    Jan 2008
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    Slightly undercharged? What's your target SH?

  3. #3
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    Apr 2007
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    6,285

  4. #4
    Join Date
    Apr 2008
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    TEXAS
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    if you got 17 degrees drop across evap coil you should be cooling. any heat gain?
    "When the people find they can vote themselves money,that will herald the end of the republic" - Benjamin Franklin

    "Government is not reason, it is not eloquence, it is force;like fire, a troublesome servant and a fearful master. Never for a moment should it be left to irresponsible action"- George Washington

  5. #5
    Join Date
    Aug 2006
    Location
    Houston, Texas
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    21
    What is the sq ft of the area being cooled?
    A 17 degree split is good and you arent undercharged by much with those system pressures

  6. #6
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    I liked the 17 degree drop, but like i mentioned earlier i think it's just air distribution(i said zoning) and yeah i think the evening sun in the front windows are a bit of heat gain, and this is the room the stat is located. Probably nothing I can do. Space is just under 1200sq ft.

    I'm not a fan of a fixed metering device and i was thinking of removing it and slapping in a TEV and a small reciever after the condenser. Think I would get better efficiency out of this or would it increase the load on the condenser. Or would it work OK i wonder. I'm sure i'd have to throw a potential relay and a start cap on the PSC compressor aswell. I may get bored haha!
    Mike
    Sig removed by mod. G-Rated site

  7. #7
    Join Date
    Dec 2007
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    89
    Check Ur Filter!:d

  8. #8
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    Quote Originally Posted by Mrfixit39 View Post
    Check Ur Filter!:d
    ok, yip she's new, lol
    Sig removed by mod. G-Rated site

  9. #9
    Join Date
    Jan 2002
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    Ft.Worth,Tx
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    superheat= maybe 4*
    Might want to undress that evaporator and check it for dirt.If you get pressures up to maybe 76psig and superheat doesn't change then I would check coil for metering problem.
    "Everyday above ground, is a good day".
    "But everyday that you have made a difference in someones life, may insure you stay above ground a little longer".<aircooled>

  10. #10
    Join Date
    Jun 2006
    Posts
    294
    Get the cfm, the supply and return WB temps to get delta h to determine the actual system cooling.

  11. #11
    Join Date
    Apr 2007
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    Quote Originally Posted by sskzekeman View Post
    Get the cfm, the supply and return WB temps to get delta h to determine the actual system cooling.
    http://efficientcomfort.net/jsp/PsychroCoilCalc_Web.jsp

    Get CFM wb and db entering and exiting evap. then use that calc above.

  12. #12
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    Dec 2006
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    this is the info I like to see,

    My CFM is 650 and I'll get some temps. DB temps I have but to get some WB temps just put my Digi thermometer probes in a wet rag and and take a reading, how do you guys get your WB readings with basic tools?

    mike
    Sig removed by mod. G-Rated site

  13. #13
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    67,597
    Digital sling.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

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