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
System status: All ducts open, clear, filter and evaporator coils
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?