I ordered a 16K BTU a/c system to replace my 8 yr old working 12K BTU factory Cruisair system. With the 12K unit, even with towels over the hatches the system is unable to maintain 75F cabin temperature on 90+ days especially when the water temps get into the high 80's. The 12K system works fine, has the right Freon charge and there is adquate water flow too.
What I've learned though is that Four Winns really didn't have the minimum required return air area outlined by Cruisair for even the factory 12K system. Cruisair recommends 130 sq in of area and what's in my boat is one 10 by 10 inch grill which has a filtered size of 8.5" square. This amounts to nearly half the minimum area. The 16K unit needs a minimum of 160 sq in so I'm adding two 5 by 10 grills to get what's needed.
Also, not sure if anyone has noticed but FW put an unfiltered return air 'slot' in the galley seat base in the area just next to the A/C system. This help the return air but is horrible since dirt and lint are directly sucked into the filter on the evaporator coil. By the way, supply air grill area is very good on the system and well within Cruisair specs.
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