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  1. #11

    Re: Sweating AC Grille

    Brian, implemented your suggestion. 2" wide, 1/8" thick adhesive backed foam rubber sold for this very purpose. Applied two layers to everything other than the actual face flange and directional vanes. Have to wait for Summer in eastern NC to get results.

    George, the discharge from the offending vent is located in the salon of the 48 LRC. It is directly across, about 10 feet away, from the entrance door from the cockpit. It is directly above the washer/dryer although these were not operational during the latest event, right after Florence went through New Bern, NC, when we were living on the boat using generator power. Directly to port is the galley. As for humidity level, that time of year and most of the warm weather season, the humidity outside goes close if not to 100% overnight. During daylight, mid afternoon, it may drop in the 50% range. Big part of the problem, is frequent opening and closing of the door to the cockpit. The unit is a 24K BTU with two evaporators of equal size one in the position under discussion and the other low under a corner built in table, directly to the starboard of the cockpit door. And the two evaporators deliver large volumes of really cold air. I have not measured the actual temperature drop across the evaporator coils. Which leads me to one other observation about the installation. When the unit was sized way back when, it had to be able to handle 95 degree outside air, while cooking on the stove with the exhaust fan running, the dryer also operating and a few openings of the cockpit door. Now you take that same system, no cooking, no dryer, evening temperatures and humidity. The system is clearly oversized for this environment. Sounds like the ideal environment for a two speed compressor. Maybe the modern chiller approach helps with this problem. As for the other discharge vents, the ones below in the sleeping/shower quarters do not exhibit the problem. The pilothouse overhead vent will occasionally start some minor sweating but nothing like the profuse sweating of the problem vent.
    Pete
    1976 Hatteras 48 LRC
    Blue Chip

  2. #12

    Re: Sweating AC Grille

    I suspect that a combination of an oversized unit coupled with high internal humidity is the cause. What is the discharge temp at that vent vs the temp in the cabin and have you ever measured the internal humidity when this is happening? A feature of an oversized unit is poor internal humidity removal because you get to set point too fast and the discharge temp can be very cold.

    George
    Florida
    2002 Cabo 47
    MAN mechanical 800/8's

    "You can avoid reality, but you cannot avoid the consequences of avoiding reality"

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