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  1. #1
    Join Date
    Mar 2013
    Posts
    72

    1991 rheem 2 ton goofy pressures

    Hey guys, have a question. Had a family member call me who owns rental properties and has a unit, rheem 2 ton not cooling. Before I had a chance to get there, they already had someone come out and look at it cause the suction line was freezing all the way to the compressor. He added refrigerant and left. Now I'm in the picture, I hook up my gauges after I check airflow on air handler etcetera etcetera. R-22 system, low side reads, fairly steady 85psig for a saturation temp of I think it was 58*, high side pressure was bouncing steadily back and forth from just under 250psig ALL the way up to slightly over 500 psig. Restriction? Newer to the field and could use a little guidance. ODA was 85*, humid day but don't know wet bulb, superheat was non existent as the temp on the suction line on the compressor pretty much matched the saturation temp, plus or minus a degree or two. What are your guys thoughts? Also, should I just kind of lead them in the direction of its time for a new system? 22 years is a good run. Thanks in advance.


    Sent from my iPhone, Jason

  2. #2
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,854
    Need more info
    Volts
    Amps
    Superheat
    Subcool
    Oat
    Rat db and wb
    Sat db and wb
    Suction temp
    Liquid temp
    Low side
    High side
    Static or true cfm

  3. #3
    Join Date
    Mar 2013
    Posts
    72
    Volts= 247
    Amps= 8-13, it fluctuated along with the pressures
    Low side pressure=85psig
    High side pressure= 250-515psig, fluctuated
    Suction line temp= about 61 degrees
    Outdoor ambient= 89* and humid
    Wet bulb temps= no psychrometer
    Superheat= 1-2 *
    Subcool= did not check because the high side pressures constantly fluctuated


    Sent from my iPhone, Jason

  4. #4
    Join Date
    Nov 2011
    Location
    USA
    Posts
    377
    Dirty coils and overcharged...

  5. #5
    Join Date
    Mar 2013
    Posts
    72
    I cleaned the coils and it still fluctuated . If it was an overcharge, wouldn't you just have a steady higher pressure as opposed to a high pressure that bounced back and forth from 250-500 psig?


    Sent from my iPhone, Jason

  6. #6
    Join Date
    Mar 2013
    Posts
    72
    I took a video of it with my phone, the pressures bouncing back and forth but can't figure out how to upload to here, it will only let me upload pictures .


    Sent from my iPhone, Jason

  7. #7
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,854
    Is it a split coil? How bad was coil before you cleaned it?
    Probably a restriction with overcharge. Hydrolic surge

  8. #8
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,039
    In a situation like this grab the bottle and take all that liquid gold out and get some more normal pressure and then start diagnostics.

  9. #9
    Join Date
    Mar 2013
    Posts
    72
    On a scale of 1-10 the coil was a 6 on the dirty scale. Not sure what ur implying by split coil. Condenser coil outside, evap coil inside.


    Sent from my iPhone, Jason

  10. #10
    Join Date
    Mar 2013
    Posts
    72
    Like I said I'm new and this is the first time I came across this, just looking for ideas and to see if I am thinking about this correctly. I appreciate all the feedback.


    Sent from my iPhone, Jason

  11. #11
    Join Date
    Jul 2010
    Location
    nebraska
    Posts
    1,629
    A way overcharge will bounce the head pressure like that.

  12. #12
    Join Date
    Jul 2010
    Location
    nebraska
    Posts
    1,629
    BTW you don't need a fancy meter to get wet bulb readings. Johnstones has the fieldpiece thermocouple with a cotton sock on it for taking wet bulb and it's cheap.

  13. #13
    Join Date
    Mar 2013
    Posts
    72
    Psychrometer is next on my list for tool to get.


    Sent from my iPhone, Jason

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