We had Fresco Refrigeration (322 297 1684) come by and re-charge Mermaid Marine Air our 12000 BTU AC unit in the salon. He (Don) did a fine job and it now freezes your out! This was in May 2014. He is listed in the Vallarta Nautica magazine.
Here is how he got to the right amount of R22, there are not many blends of refrigerant here in Mexico
Water temp & return air temp on chart to find R22 PSI
Was 30 lbs and was charged to 85 lbs.
Water temp 87 and return air was 83 deg.
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