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Extremely high head and suction pressures

Originally had the same conditions above and came to the conclusion that the evap coil had blockage (we tried several times to clear it) and then removed all the refrigerant, swapped out the evap coil (used nitrogen while brazing), did a pressure test and vacuum test, and recharged with new refrigerant -- note: evap coil uses a piston metering device and we reinstalled the same one -- during the beginning of the recharging process the pressures and temps seemed to be ok but then the hissing noise at the condenser (bypass) started and after a few minutes the head pressure climbed way up and the suction did not follow -- but after we shut off the unit the head remained high and the suction followed -- after a few more minutes the head pressure dropped and the suction pressure remained high -- if the unit is powered back on then the cycle repeats itself -- so we're not sure what to check from here -- I suspected the condensing unit filter/dryer but the temps on either side of the device are not drastic

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  • dochoa838 Aug 14, 2008

    american standard model # wch024b100aa heat pump. starts ok then my head pressure go's real high and my low side go's down then it comes back down and repeats it's self till it trip over load. could it be my txvs or reversing valve going bad?

  • b_neilson Dec 12, 2013

    a restriction to refrigerant flow, faulty txv, plugged screen located at the txv inlet, possibly kinked liquid line.

  • Anonymous Mar 23, 2014

    replacing air conditioning condensing unit, where do i locate the piston metering device

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Disconnect the blower and turn on the ac.see if the coil frosts evenly.when you had the system open,you should have changed the liquid line drier.

Posted on Jul 29, 2008

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