I recently got a call on a small kitchen make up air blower that had a slab DX coil "patched" into it. The compressor had shorted windings and the owner wanted me to replace it. I told him I didn't think it would last due to the high suction pressures you would likely see on a very hot day. He said the unit worked fine for years.
I would guess this thing to be about a 4 ton A/C (model # unreadable), which would run when the make up air blower was on. The only other control was a low ambient t'stat that would cut it out below 65 degrees F. How could this thing have possibly survived for "years" with 100% outside air and temperatures that can come close to the century mark and high humidity? I don't want to do the job because even if the thing did last for years I don't know if he would be so lucky again.
Would it be possible to add a CPR valve and set it around 70# to protect the compressor?