Trojan Boat Forum

First off let me say I love this forum,Have been away for some time and spent alot of time reading the past posts. Enough said, My question.... my boat is a 10 meter international the heat and a/c enters the boat from vents in the ceiling. The air flow is fair but almost nothing in the foward sleeping area. Last summer I had to remove the complette mirror assm. in the head. The a/c was on and I noticed alot of air flow coming from the opening, same thing when I went to replace one of the florecent lights in the port side. Any ideas ???

Your AC unit most likely has a plenum (box) on top with two or three ducts coming off it. They may have dampers in their openings or not. If they do, you can try to play with those to get the flow going where you need it. Usually the berth is farthest from the AC unit so that is why less flow. You should check to see that the duct is not crushed on its path from the AC unit to the vent. You can also control flow by restricting the flow in the head by closing the vents as much as possible and the back pressure will force more air to the berth. Typically there would be less air going to the v-berth because of less solar load on that space than the cabin and the head probably has more air because of its proximity to the AC unit and to help dehumidify the head.

The 10 meter express HVAC has duts that are built into the ceiling headliner of the salon.

There is more pressure closer to the fan than at the end of the run, toward the bow.

I found some similar air leaking around the medicine cabinet in th ehead. A quick dousing with some spray foam insulation will take care of this stray air.

When performing properly, the 16,000 BTU unit is quite capable of cooling the vessel.

Look for air leaks around the engine room cover on the bulkhead (engine room side)

Additionally there should be a flexible piece of ductwork running from the top of the HVAC unit output to the upright plenum of the boat. If this is torn or not sealing properly you won't be getting proper cooling.

Also a quick pressure check to the lo and high pressure sides of the system may be a good idea too.

RWS

I don't have a 10 meter but I do have a 11 meter. We had a low flow of air when we got the boat. I started searching and found that the top had dropped down in the cabinet area. I had to put a brace in there to get the duct back to shape. I would check for collapsed duct too. This duct was factory duct that had slipped down at the entrance to the maind salon.