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Does any 424 owner have the factory installed 110v AC? I am thinking of adding 110 AC and ditching the 8,000 btu window unit that sits in the aft companionway. So my questions are: how many compressor units do you have? Where are they located? Where are the air vents located? How many? What size btu? I am thinking of one 16,000 btu unit located on a shelf in the port cockpit locker above the 12v frig/freezer compressor condenser unit. Maybe one vent in the aft cabin somewhere and another in the main saloon hanging locker next to the door, starboard side by the companionway. Any thought would help, Cindy sv Island Bound
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Start of attached email. Subject: New 110 AC
Does any 424 owner have the factory installed 110v AC? I am thinking of adding 110 AC and ditching the 8,000 btu window unit that sits in the aft companionway. So my questions are: how many compressor units do you have? Where are they located? Where are the air vents located? How many? What size btu? I am thinking of one 16,000 btu unit located on a shelf in the port cockpit locker above the 12v frig/freezer compressor condenser unit. Maybe one vent in the aft cabin somewhere and another in the main saloon hanging locker next to the door, starboard side by the companionway. Any thought would help, Cindy sv Island Bound
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Cindy,
My PO replaced what i assume was the factory installed A/C. That original
installation was two compressors, one in the starboard hanging ,locker
under the forward companionway (I think), the other a very small unit
under the seat in the forward cabin. The PO replaced that configuration
with a single larger unit in the hanging locker. Somewhere I have the
specs on that unit, but it is more than 20 years old (but still working)
and the manufacturer is long gone. This unit is barely adequate for the N.
FL summers.
Ducting and compressor location I believe are the key to a satisfactory
installation. Locating the compressor in the cockpit locker would probably
do well for the aft cabin and OK for the main cabin, but my guess is the
long duct run to the forward cabin would not deliver much in the way of
cold air.
My ducting runs both forward and aft from the hanging locker with the
largest vent next to the locker door. That vent pumps air into the galley
area and the saloon. The forward cabin gets OK cooling. The cooling to
the aft cabin is almost non-existent. I think that is because the ducting
had to be very small to fit through the head and behind the shower pan.
Also there is only a single fan blowing the air to all three vents.If and when I replace my A/C I will probably hire a knowledgeable HVAC
expert to design the ducting.Regards,
John Stevenson
http://www.svsarah.com
Sarah’s BlogOn Tue, Jul 21, 2015 at 4:03 PM, Cindy Stein via maillist <
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Start of attached email. Subject: Re: New 110 AC
John, Thanks for your response regarding location of ducts, etc for AC. Regards, Cindy sv Island Bound
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Cindy
I installed a Mermaid Heat Pump (16,500 btu) in Eclipse when I first bought
her 7 years ago
The install is similar to John’s. Compressor is in the hanging locker at
the mid ships companionway.
One fan blows air into 2 branches of ductwork.. 1 branch blows into the
main saloon/galley just aft of the hanging locker door and a smaller branch
from this feeds into the head.
The other branch splits… with 1/2 going forward to the V Berth (thru the
storage areas behind the saloon cushions) and the other 1/2 going aft
behind the shower to the Nav station. The Nav station gets more air than
the V berth. On really hot days we close the aft cabin and duct at the Nav
station and only cool the forward portion of the boat.
Ideally the V berth needs it’s own small (maybe 5k unit).
The Mermaid unit (purchased from Defender) has been reliable.Rick
On Tue, Jul 21, 2015 at 4:03 PM, Cindy Stein via maillist <
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Thanks to John and Steve for their thoughts. I had a frig guy come by yesterday and he suggested one 12,000 btu marine air (dometic) self contained turbo unit mounted on a shelf just aft of the door in the stb midship locker. One vent pointed straight out toward the galley and another vent in the same locker but facing forward above the aft end of the stb saloon cushions. The third would have ducting going thru the head behind the sink lockers, thru the back of the shower (I have a large access hatch above the seat. There is a ton is space behind the shower stall) and out at the nav station facing the port side. I sleep in the aft stateroom, and I’m not too worried about the fwd stateroom at this time. The vent facing fwd in the main saloon may pump some air into the forward stateroom. Dometic came up with a new self contained unit design in 2007 with a turbo fan which may be more efficient than the older units. My window AC sits in the aft companionway and cools the whole boat nicely with 8,000btu. This probably works as the air blows thru the whole boat. I was in Ft Lauderdale and am now in Ft Pierce so it does get hot here! I’m still wondering if 12,000 btu will cool the boat enough. I guess I’ll find out. Anyone else feel like chiming in feel free. Regards, Cindy S/V Island Bound
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Start of attached email. Subject: Re: New 110 AC
Thanks to John and Steve for their thoughts. I had a frig guy come by yesterday and he suggested one 12,000 btu marine air (dometic) self contained turbo unit mounted on a shelf just aft of the door in the stb midship locker. One vent pointed straight out toward the galley and another vent in the same locker but facing forward above the aft end of the stb saloon cushions. The third would have ducting going thru the head behind the sink lockers, thru the back of the shower (I have a large access hatch above the seat. There is a ton is space behind the shower stall) and out at the nav station facing the port side. I sleep in the aft stateroom, and I’m not too worried about the fwd stateroom at this time. The vent facing fwd in the main saloon may pump some air into the forward stateroom. Dometic came up with a new self contained unit design in 2007 with a turbo fan which may be more efficient than the older units. My window AC sits in the aft companionway and cools the whole boat nicely with 8,000btu. This probably works as the air blows thru the whole boat. I was in Ft Lauderdale and am now in Ft Pierce so it does get hot here! I’m still wondering if 12,000 btu will cool the boat enough. I guess I’ll find out. Anyone else feel like chiming in feel free. Regards, Cindy S/V Island Bound
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Don’t know if this helps, but…
A 6000 BTU window unit over the main salon hatch (not the forward
companionway) keeps the main salon livable in 100°F outside temps, with the
forepeak closed off and the aft cabin open, but not very cool until evening.
I’ve got a main boom-length deck awning for shade, which surely helps.Tor
Silverheels, P-424 #17
http://www.silverheels.us
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When I can get myself together to get my A/C from storage, I have a 12,000
or 10,000 BTU unit that fits perfectly into the aft companionway and keeps
the whole boat cool in 90+ degree weather.The problem is that I am too lazy to move it every time I want to sail…
On Fri, Jul 24, 2015 at 7:06 PM, Silverheels via maillist <
> wrote:Quote:Don’t know if this helps, but…A 6000 BTU window unit over the main salon hatch (not the forward
companionway) keeps the main salon livable in 100°F outside temps, with the
forepeak closed off and the aft cabin open, but not very cool until
evening.
I’ve got a main boom-length deck awning for shade, which surely helps.Tor
Silverheels, P-424 #17
http://www.silverheels.us
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Good point, Bob. I was only sharing my set-up’s accomplishments and limitations to give an idea of what comfort 6000 BTU’s will and won’t provide in a 424 in maximum hot-weather conditions. I wouldn’t go sailing – even day sailing – with that window AC on the coachhouse.
What I have works for me now because I’m here to do boat projects, not day sail, and when I’m done here I’ll leave the window AC unit ashore or pass it along, as I’ve done before, and go cruising. Then I’ll live at anchor and settle for whatever breeze comes through the hatches and a couple of 12v fans. My window AC is a cheap solution for a particular need. If I were based at a hot-climate liveaboard marina, sailing once in a while and returning to the dock, I’d opt for an installed AC as Cindy has.
Tor
Silverheels, P-424 #17
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Pete,
Those 3 steps (with storage beneath) and the adjacent cabinet at the forward
c-way are nice! Did you add them, or was that a Pearson brainstorm?Tor
Silverheels, P-424 #17
http://www.silverheels.us
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Sorry Rick, I called you Steve. I found the old conversations re AC in 2009 by doing a search on this forum. Sounds like John is correct that a good installation needs straight, short duct runs of the proper size. The AC guy and I both looked at the space behind the stb settees. We didn’t like the idea of drilling 6″ holes. That’s why we gave up, for now, having a vent in the fwd cabin. If I ever need more cooling in the V berth a small separate unit may work…..Marine Air (dometic) specs call for 6″ ducts for the 12,000 btu unit and 7″ for the 16,000 btu unit. I would rather have good cooling in the main saloon and aft cabin where I sleep….also, AC amps is a consideration. The 12,000 btu unit uses 8.7amp in cool and 10.9 amp in heat mode. The 16,000btu uses 10.4 in cool and 13.6 in heat and would require a 40amp breaker, which would put me over the top for one 50amp shore cord……Tor, I tried the window unit overhead in the main saloon and it cooled only the main saloon and not the V or aft cabin. 8,000 btu window unit works great sitting in the aft companionway blowing straight thru the boat. Regards, Cindy
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Start of attached email. Subject: Re: New 110 AC
Sorry Rick, I called you Steve. I found the old conversations re AC in 2009 by doing a search on this forum. Sounds like John is correct that a good installation needs straight, short duct runs of the proper size. The AC guy and I both looked at the space behind the stb settees. We didn’t like the idea of drilling 6″ holes. That’s why we gave up, for now, having a vent in the fwd cabin. If I ever need more cooling in the V berth a small separate unit may work…..Marine Air (dometic) specs call for 6″ ducts for the 12,000 btu unit and 7″ for the 16,000 btu unit. I would rather have good cooling in the main saloon and aft cabin where I sleep….also, AC amps is a consideration. The 12,000 btu unit uses 8.7amp in cool and 10.9 amp in heat mode. The 16,000btu uses 10.4 in cool and 13.6 in heat and would require a 40amp breaker, which would put me over the top for one 50amp shore cord……Tor, I tried the window unit overhead in the main saloon and it cooled only the main saloon and not the V or aft cabin. 8,000 btu window unit works great sitting in the aft companionway blowing straight thru the boat. Regards, Cindy
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One other configuration for your consideration. Blue Moon has a 16,000 BTU unit located under the aft bunk, in a compartment adjacent the starting battery. I don’t have duct work. I have two evaporator/fan units, one over the aft bunk, and one at the stbd forward end of the main cabin. Refrigerant coolant lines run to the evaporator/fan units. It performs ‘adequately’ in the N. Florida climate in July/August, but won’t exactly run you out during the day. At night you can hang meat in the boat. I try to keep the forward cabin closed off during the day to save cool air.
David Tye
#189 -
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Start of attached email. Subject: Re: New 110 AC
Hi David. What kind of boat do you have? I don’t see how your AC setup would even be possible on my P 424 hull 31. Maybe you have a 422? Thanks, Cindy
Island Bound 424 #31
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Hello Cindy,
My boat is a pretty standard single head 424 ketch. Installation of the air handlers in the aft cabin and main cabin took some custom cabinet work to install, but look pretty attractive. I wish the fans in these units pushed more air than they do, my only real complaint. But they do put out cold air. I can cell phone some photos to you if you’d like.
David
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Start of attached email. Subject: Re: New 110 AC
David, I’d love to see the pics! I sent you my email address you can send there or post on the forum. Thanks, Cindy
Island Bound 424 #31
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We are hull number 189. I posted some pictures to our blog of the AC unit and cabinetry installed by the previous owner. It is a Cruisair. It’s a bit small for the boat but keeps us cool enough. We use a fan to help spread the cooled air. Our blog is http://bluemoonsails.blogspot.com/
If the link doesn’t work, you can copy and paste it.
Pat -
http://bluemoonsails.blogspot.com/
This is a link to our blog. We have pictures posted of our A/C unit and cabinetry installation. A few other items we’ve added as well.
Pat -
Thanks David for posting the AC pics on your website. Whow, those vents are really large in the main saloon and aft cabin. I can see why the v doesn’t get cool. I would think the aft stateroom freezes you out with that 8 or 10″ vent blowing over the bed. I also liked your sink install. Did you put in the coriander counter? It looks real nice! Regards, Cindy
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Start of attached email. Subject: Re: New 110 AC
Thanks David for posting the AC pics on your website. Whow, those vents are really large in the main saloon and aft cabin. I can see why the v doesn’t get cool. I would think the aft stateroom freezes you out with that 8 or 10″ vent blowing over the bed. I also liked your sink install. Did you put in the coriander counter? It looks real nice! Regards, Cindy
Island Bound 424 #31
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Hello Cindy,
The Corian was with the boat when we bought her. Same stuff in the forward cabin and in the head compartment. We’ve had guests stay in the forward cabin, and placed a fan on the main cabin sole blowing forward and they reported it was comfortable. Probably wouldn’t be during the day, but fine at night. Yes, the aft cabin cools very well. She likes it cold, so works out.
David
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