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  1. #1
    Join Date
    Jun 2007
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    High Suction Pressure..

    Hello, I installed a 1.5 ton Tane Heatpump for the second floor of a 2 zone system. After starting the system up I noticed the suction pressure was running around 100 psi and the head pressure was around 215 psi. it is an R 22 system. The outside air temp was 95 degrees and the inside temp was 85 degrees when I started the system up. I am getting around a 67 degree discharge and the suction line is sweating back to the compressor. I'm not sure what is causing the suction pressure to run that high. I was thinking maybe the TXV valve was not working correctly. Doeas anyone have any Suggestions?

  2. #2
    Join Date
    Mar 2007
    Myrtle Beach, SC
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    At startup it is normal for the suction pressure to be around 100 PSI with a TXV at the indoor coil. After it runs a while, the suction pressure will come down. You have a very high load and the TXV is trying to cool that load.
    Remember, Air Conditioning begins with AIR.

  3. #3
    Join Date
    Jan 2004
    Post Likes
    ID wetbulb
    Delta across evap coil, taken at unit, not grilles.
    SH, and SC
    DB delta across condenser coil.

    Might just have been high load.
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    How many times must one fix something before it is fixed?

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