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    cfarnum's Avatar
    cfarnum Posts: 7, Reputation: 1
    New Member
    		  
    #1

    Jun 19, 2008, 06:38 PM
    Txv valve acting up
    I have a refrigertion unit that is not working properly. First there was a problem with the solenoid valve and then a compresser replacement. Unit is still not working. The pressures with unit runnig is 4 psi suction and 200 head, R-22. Unit has plenty of refrigerant because unit is running as the safties are all closed. The compresser does not run hot it is rather comfortable to the touch. I believe the TXV is the culprit. Testing the sensing bulb with hot and cold water should this be done with the unit on?
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #2

    Jun 19, 2008, 07:07 PM
    With the pressure reading of 4/200 it sounds like metering device is restricted, but the compressor would over heat and shut off from the low refrigerant flow coming back to it. With a restriction that bad (at 4 psi on suction) the head pressure should be a lot higher if you had a full charge(around 350 and 450) You may have two problems a restricted metering device or drier and a refrigerant leak.
    cfarnum's Avatar
    cfarnum Posts: 7, Reputation: 1
    New Member
    		  
    #3

    Jun 20, 2008, 08:42 AM
    There is no leak on the system for sure. All safeties are working properly
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Jun 20, 2008, 09:10 AM
    First there was a problem with the solenoid valve

    If this is a pump down system I would revisit the selonoid and controler to check for proper operation and flow..
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