Hey, It Works!!! Marine
Air Systems Passport 2,16,000 BTU on 2000 Catalina 36
. Sailed in Lake Michigan & Upper Mississippi
River. This the season to get this thing going! Below is my learning
curve and now works on my boat. Some of these suggestions are obvious, but might get overlooked.
1) Do you have healthy water
discharge? Check water
flow system, from water intake to water discharge for obstructions (zebra muscles might be clogging hoses, valves, screens, fresh water filter filled with algae). You might have to ream out hoses for obstructions.
2) The heat exchanger
, aka evaporator coil) water flows through a box with filled with a copper pipe, surround by freon), air is drawn by the blower over the fins of the evaporator. Heat from the air is transferred to the refrigerant (freon or similar). The heat is transferred to the fresh water and heated water discharged. Hope your coils feel really cold. If you have your windows and hatch
covers open, you will only invite too much moisture in and you CAN freeze up the copper pipes -if you freeze up, there is a defrost cycle on control panel
for the heat exchanger
. You will never cool the boat if you are inviting hot humid air to easily enter cabin
. Close boat up, hopefully you have a hatch
cover alternative - my boat came with zippered hatch cover, snaps in place, with clear plastic flexible plastic window material.
3) if your boat has been in high mineral content waters, there could be a calcium build up in heat exchanger. Disconnect both upper and lower hoses for heat exchanger. Plug
discharge pipe with 24" clear hose and insert funnel to other end of hose. Raise funnel above the top of heat exchanger and Pour vinegar in the funnel until it comes out the heat exchanger on the top (muriatic acid or lime away scares me - vinegar is much less toxic to the environment
and your hands). Secure funnel end so it remains above the top of heat exchanger and let the vinegar sit for a day (or a week). Vinegar will dissolve any calcium deposits in the exchanger.
4). One reason your AC system might not be working is because there may be air bubbles somewhere in the water lines. My set up has a small valve on the discharge side of the pump (between the pump and the hull) that allows me to discharge a small stream of water for a few seconds to purge any air bubbles out of the system (yes, the fresh water hull
valve must be open).
5). Make sure return air grill
next to the heat exchanger (in the cabin) is clean. The return air grill
will be at floor level in the main salon
. You should vacuum it or wash if possible with fresh water. Cat and dog hair stuff these grills up.
6) Make sure the cold air grills in all cabins are un obstructed (yes, this past weekend a family member
conveniently put a book or magazine covering the grill.
7). Read your manual or download and keep printed copy on board.