OK well here it goes. I am no HVAC tech but I am not helpless. With that said I have a lennox e11? central air what I believe to be a 1.5 ton system using a orifice tube. the air worked fine our first hot stretch this year. turned it off when it cooled back down then tried it again a week later and nada. I hooked up a ****ty gauge to see what was going on and there went my r22.... ok so I called a guy to fill it up. he says he put 1.5 lbs in it but doesn't like his low side pressure and discharge temp. he also thought high side was a little high but I only saw 300 for high side and like 32 for low side and around 40* line temp. ambient was around 76*
Now it is my understanding that these systems are installed using pre-filled lines? Is this correct?
So my high pressure line goes from the compressor/condenser unit into my basement the routes over by the furnace(electric) then u-turns back to the outer wall then another U-turn to the evaporator. Now right at the evaporator is I believe the orifice tube(slightly larger diameter before the fiting to the evaporator). is this correct?
Now the problem; The liguid line starts to freeze at the second U-turn by the outer wall all the way to the inlet of the evaporator.
Diag; attempted to fit a guage to see what t read and leaked out a bunch of r22. called a guy to fill it and he says he put about 1.5 lbs in but couldn't get his discharge temp where he wanted it without it freezing at the liquid line coming out of the condenser. I cut out the evaporator and cleaned the fins(very dirty, mow very clean) replaced the filter. fired it up and saw the frost forming right at that second U-turn I described. there are no kinks .
Is there a restriction in the U-turn. if so is it the compressor coming apart or just 25 years of wear. or should I just try to replace the orifice tube like 12 feet away from where the freezing starts? what about replacing the pressure line orifice and condenser?
Thanks a million in advance!