I have over 30 years in the industrial electrical field with limited experience troubleshooting HVAC control systems so am acquainted with your craft. Having worked alongside HVAC techs I am familiar with the terminology and theory of operation, but have no practical experience charging a system (essentially when called I determine if it's an electrical problem and that's it).
Home air unit CAC/BDP Product ID HAICJX042000AAAA Mod HAICJ042-A manufactured with 7.63lbs R-22 Hi 300, low 150 from factory, ten years use in Central Florida.
Problem: Evaporator icing; when de-iced AC cooling inadequately. Another problem I'm not concerned with presently is that the reversing coil for the heat pump is stuck in cool (but we hardly ever need to heat, so get by with emergency heat with compressor unit power disconnected).
System status: All ducts open, clear, filter and evaporator coils clean.
Parameters: System start +5min temperature readings- air temp at filter inlet 75 deg, airspace on cool side of evaporator 68 deg outdoor amb @80 deg currently.
Low side pressure 28 psi; High side 175
Diagnosis: refrigerant leak (high side line outside unit exposed and may have been slightly damaged by lawnmower bumping against it).
I have gauges, air flow meter, temperature differential probes, a tif
5600A leak detector (that doesn't currently work and should keep me occupied a while as I repair it), 30lbs of R-22, gas, and my standard electricians tools, all of which I am not afraid to use.When the leak is found, fixed, and refrigerant is added what should my low and high pressures be?