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Old 06-01-2018, 04:55 PM   #1
greysailor
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City: Matagorda Bay
Vessel Name: Salty
Vessel Model: 2005 Defever 44
Join Date: May 2013
Posts: 227
A/C Charging Specs

I have one of my 3 split system A/C units (R22) that will only obtain ~14 degrees TD....The other 2 units are doing 18-20 degrees TD. Good condenser flow through all units and evaporator coil/filter clean.

I checked the pressures and suction line temp and came up with ~4 degrees of superheat...seems a little low (too much charge) to me as most non-TXV units call for 15-20 degrees of superheat, if memory serves. I called the manufacturer's "tech line" who referred me to several authorized dealers for charging info. I called 3 of them, and got 3 different answers as to target superheat. One of them even used the old shade tree mechanic adage "beer can sweat" on the suction line, so I discounted him right away!

I intend to play with the pressures a little and watch the evaporator TD, but would like to know if there is a spec for target superheat before I start. Any Marine Airrrrr pros out there?
Thanks in advance!
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