Hey guys... I have a major problem I was hoping someone could help out with.
I have a pretty old r22 central air unit with the compressor outside and the evaporator inside the attic.
It has always been a work horse. No problems. A few years ago it developed a small leak. Refrigerant lasts a few years.
This year it was low so I had my AC tech put it in.
Everything was running great for about 3 weeks. I am in NY so it isnt very hot out yet. mid 70s during the day and significantly cooler at night.
A few weeks after the R22 was added, the unit started freezing up. I didnt realize this and it froze solid and caused a small leak in the ceiling under the attic.
I had a buddy of mine with all equipment test the pressure and everything looked great. I cleaned out the compressor which was unbelievably dirty and it ran great for another 3 days or so and started freezing again. This time I caught it earlier and just turned off the unit.
I called the professional AC tech back and he came and looked at the pressure, condenser and evaporator coil.
He told me the pressure looks fine and it is not being caused by lack of refrigerant.
He said it could be happening because the weather is so much cooler at night. He had me lock the thermostat at 75 degrees and said if it holds it there for a few days without freezing, it is most likely fine and its the outside air temp causing the problme. If it freezes up it is the coil and since they dont make R22 coils anymore, I will need an entire new unit for $5,000 - $6,000. So now Im freaking out. I do not have the money for this right now.
Does any of this make sense? Wouldnt it be more likely that the coil was dirty and clogged than out right bad? And assuming the coil is bad, cant I just get an R22 coil for this unit either online or from a plumbing supply store? Would I really need an entire new unit and have to switch to 410?
that seems very extreme to me...
Any help would be hugely appreciated!!!!!!! Thanks a million in advance.