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  1. #1
    Join Date
    Apr 2014
    Location
    Dallas, Texas, United States
    Posts
    1

    4 ton with a restriction somewhere?

    Check: 4 ton equipments match up- good, liquid line is 90 from condenser to the evap, piston type r22, Low suction, high head, high super heat and high sub cooling, pump down, piston is clean and blew nitrogen from suction and liquid line, found two driers one inside and one outside however no temp drop, at the distributor all feeder tubes are freeze up evenly, check speed tap to blower and any air flow problem-good, (the evap coil was replace last year by another company so I check inside for a manual lol), I wash the condenser to rule that out, did not see a screen before the piston but it did have a 90 before the piston. Also when disengaging from suction foam crap is observed.

    So, any advise on this mess up call?

  2. #2
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,836
    Sounds like oil when you take gauges off.

    What were your pressures and temps, return wb/db and oat?

    Did you remove both driers and install a new one?

    Sent from my SM-N900V using Tapatalk

  3. #3
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,836
    You also might have non condensables. Try pumping down again and run the condenser fan only. Then see if pressure in condenser equals what oat is.

    Sent from my SM-N900V using Tapatalk

  4. #4
    Join Date
    Oct 2010
    Location
    Utah
    Posts
    48
    Just from the info you gave I would say indoor drier is plugged and system is overcharged.


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  5. #5
    Join Date
    May 2014
    Posts
    14
    Guarantee you oil has migrated and Is restricting your orifice. Get your head up by blocking off your condenser and try to get that oil back to the compressor.

  6. #6
    Join Date
    May 2014
    Location
    Memphis, Tennessee, United States
    Posts
    2
    using all previous information on previous post sounds like there's possible restriction either inside the condenser or inside the evaporator coil if all the other methods have failed and you're still getting a high had liposuction clean up the system down again Purge with 300 pounds of nitrogen then release then pull back down again get your my crossbow 500 and then isolates vacuum pump see if it'll hold want to do that recharge check your charger and see if that works

  7. #7
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,150
    remove refrigerant , weigh to see how much they had in there

    Remove both driers , add new one

    Recharge , and If you still have low suction , txv probly bad ( is bulb mounted on suction line ? )

  8. #8
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,876
    Quote Originally Posted by Snapperhead View Post
    remove refrigerant , weigh to see how much they had in there

    Remove both driers , add new one

    Recharge , and If you still have low suction , txv probly bad ( is bulb mounted on suction line ? )
    Think he said it has a piton. So 1 or both of the FDs are most likely the problem.
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  9. #9
    Join Date
    Jun 2005
    Location
    SW Wisconsin
    Posts
    4,966
    Additionally; Check the piping, it may need necessary changes to improve oil return to compressor.
    Too many systems are installed that are not properly piped causing oil to mess-up performance & lead to compressor failures.

  10. #10
    Join Date
    Apr 2012
    Location
    North Carolina
    Posts
    15
    Remove charge and record the weight then remove both LL FDs and install 1 new one.
    Weight the correct charge back in.

  11. #11
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,595
    Verify piston is the correct size for the outdoor unit too.

  12. #12
    Join Date
    Sep 2002
    Posts
    2,728
    90ft run,is it not a little long for a piston?

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