Two years after the installation, we had the original installer put a TX valve at the AHU to replace the orifice check which apparently had packed it in.
Prior to the job, he said that the unit would be pumped down to do the job and I thought this meant that the refrigerant would be captured in the outdoor unit and then reused after. If that is the case:
1) How much refrigerant would be necessary to get a 3.5 ton unit with 40 feet of lineset back up and running?
2) After the installation he billed me for 9 lbs of refrigerant. Is that normal?
I asked him why so much was required and he said that he had to replace the dirty refrigerant from the lines. Huh? If it's dirty-Why? Why was so much in the lines? I saw him blow out the small line with Nitrogen into a rag and nothing came out.