I don’t know what type of metering your unit has, TXV or Piston; but it does not make any difference if ½ the A coil is freezing you most likely have plugged distribution tubes in the A coil. Any unit that is freezing over is without a doubt slugging liquid back to the compressor and that compressor is going to die sooner rather than later.
It would be absolute suicide to reuse the old A coil as it is, and only replace the compressor.
If you do not replace the entire unit make sure your HVAC guy knows how to clean up the system.
Make sure your guy knows how to check superheat, subcooling and airflow and is capable of making sure the system is performing to rated capacity before they leave the job.
If the last guy charged you $750 under warrantee and left it with debris plugging up the A coil he obviously never did the required clean up and startup proceecures and would appear to be either unqualified, unethical or both.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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