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  1. #1
    Join Date
    Feb 2009
    Location
    Winnipeg MB
    Posts
    16
    Post Likes

    Geothermal Heat Pump Problem...

    Problem: Evap coil is icing up and not cooling space down to setpoint.
    Data:
    R410A 340 High Side 76.5 Low Side
    10.7 degrees F Subcooling
    78 degrees F EWT
    82.5 degrees F LWT
    SA - 64.6 degrees F
    RA 74.4 degrees F
    Superheat 55.9

    These are the technical data values that are listed in the manual for cooling:
    244PSI High side 81PSI Low side
    8 degrees F Subcooling
    51.2 degrees F EWT
    65.4 LWT
    SA 48
    RA 71
    Superheat 12

    I think i know what is wrong, but i've only had a small about of experience working on geothermal heat pumps. I'd like to know what someone with more experience thinks. Thanks in advance for your response's. Unit is a Northern Heat Pump MN: RAVE-312-C131

  2. #2
    Join Date
    Jul 2013
    Posts
    63
    Post Likes
    Look at it like its an air to air. You're not having trouble with the water side. Still doing the same thing.

  3. #3
    Join Date
    Mar 2007
    Location
    Cedar Rapids, Iowa
    Posts
    126
    Post Likes
    What is the flow rate through the loop? What is the Heat of Rejection? Why are you putting a gauge set on the unit BEFORE performing the HR/HE calculations?

    Bergy

  4. #4
    Join Date
    Feb 2009
    Location
    Winnipeg MB
    Posts
    16
    Post Likes
    Tommyz23: If it were an air to air, i would think the TXV is stuck closed and needs to be replaced.

    Bergy: I have never checked the flow rate through a loop. How would i do it? I'm not sure what the HR/HE calculations are. Can you explain?

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