Ok have a unit that is under performing per customer.. went and checked it out just a Payne R22 straight electric /cool horizontal system about 6 yrs old with a scroll compressor and txv..
Has a low indoor split delta t around 15 at plenums however i took numbers to verify theres an issue..
The indoor temp was 77 and outdoor was 83 and in the shade the pressure were 87 suction with 4 degree super heat and 176 head with 4 sub cool.
the plate states 10 degree target sc but if i try and add r22 the suction will go up as will the evap temp which wont solve my issues and the SH will drop so low it cause future issues with flooding condenser etc..
My amps for compressor were 3.75 and plate stated rla 7.7..so a little low?
so i didnt have a megger (dont own one yet) or my airflow instruments with me because this is a 6 yr old unit but my first guess is the compressor valves are weak or not opening closing properly etc..
what do you guys think is an issue if any? the suction pressure is way high and sc and sh way low for these condition's IMO and im thinking compressor issues?