What do you think of these numbers?
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  1. #1
    Join Date
    Mar 2010
    Location
    Downriver, Michigan
    Posts
    14

    What do you think of these numbers?

    Here in Michigan it's 87 degrees outside and the discharge tempature is 52.3 degrees.

    D

  2. #2
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,776
    Indoor supply air temps alone don't tell us what other things we need to know in order to tell how the system is performing.

    What data is needed:
    Performance Data Collection – Best Time to collect data is late afternoon around 4:30 pm, when attic is HOT; also when outdoor temps are around 85; 95; 105F or, anywhere in between.
    *All U need is a good thermometer (digital reading in tenths preferable) & and indoor Humidity Gauge

    1) Helpful; Tonnage & SEER of Unit & outdoor condenser model number: ___________

    2) TXV or, orifice metering device? _______. Only if U know…

    3) Outdoor condenser’s discharge-air-temperature ______-F
    Subtract Outdoor air temperature: _______
    Outdoor Condenser Air-Temp-Split _______

    4) Need the ‘Indoor’ percent of relative humidity - in the middle of the rooms or, at Return-Air inlet grilles ___
    5) Indoor Return-Air Temperature ______
    Subtract Indoor Supply-Air Temperature ______ -F
    Indoor temperature-split _______-F

    We need the above information, plus "a Tech's" Pressure readings & Superheat & Subcooling temps, for troubleshooting & performance analysis.

    Example below:
    A Goodman 2-Ton 13-SEER condenser, 800-cfm indoor airflow; 80-F indoor dry bulb & 50% relative humidity; Indoor temp-split 18 to 19-F.
    @ 85-F outdoors; 103.9-F - 85-F outdoors or around an 18.9-F temp-split;
    @ Indoor 75-F & 50% RH condenser temp-split is only around 14.9-F.

  3. #3
    Join Date
    Jan 2008
    Posts
    1,943
    52.3 degrees might be great, might not.
    Post all the readings you have.
    "Hey Lama, hey, how about a little something, you know, for the effort." And he says, "there won't be any money, but when you die, on your deathbed, you will receive total consciousness." So I got that goin' for me, which is nice. - Carl Spackler

  4. #4
    Join Date
    Feb 2004
    Location
    chicago suburbs
    Posts
    4,422
    ill be even more impressed if you tell me your return air temp is 72.3 degrees.
    FILL OUT YOUR PROFILE!!

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