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Air conditioning options for CD 22 or Venture 23
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ssobol



Joined: 27 Oct 2012
Posts: 3580
City/Region: SW Michigan
State or Province: MI
C-Dory Year: 2008
C-Dory Model: 22 Cruiser
Vessel Name: SoBELLE
Photos: SoBelle
PostPosted: Sun Jan 15, 2023 1:49 pm    Post subject: Reply with quote

I have a window AC unit that fits the center window of my CD22. The unit sits on the floor of the cabin just aft of where the porta-potti sits when not in use. Having this unit allows the AC system to be left at home when not needed.

I use split pipe insulation around the edges of the window to block the gap. I also put some runners on the bottom of the unit (from PVC lumber) that has a notch cut into them to grab the window frame. There is another piece cut that goes outside the window on the top of the trunk to support the back end of the unit. I have to disconnect the window strut from the frame to fit my AC unit. However, this allows the strut to hold the window fully open by putting the end on the top of the trunk.

I used to boat in the mid-Atlantic region. While it does not get as hot as the SW, the humidity is brutal in the summer. The window unit worked pretty well to cool and dehumidify the cabin, but it helped to put the window shades up on the sunny side of the boat.

I can run my AC unit off my Honda EU1000 without any problems.

One thing to keep in mind is that these small AC units get some of their cooling by slinging water. As the run, the condensate is collected in the bottom of the unit for the fan to pick up and sling. Some small units have drains to dump excess water, some don't. If you have a unit without a drain you are likely to get wet picking the unit up if you don't keep it level. One unit I had did have a drain which I could connect a hose to that allowed water to drain overboard. The current unit does not have a drain so I added a small drain valve that allows me to dump the water before moving the unit.

The opening to the window on a 22 is not that big. AC units in the 5000BTU units will fit, but you should measure to be sure. I did buy one once that did not fit and had to be exchanged.

Mechanical controls on the unit are probably better than electronic controls because the power supply may not be that stable.

Since the AC unit mounted in the window tends to blow to the back of the cabin, I have a 12v fan that is positioned in the berth entry to blow the cabin air into the berth when sleeping. This works very well.

Yes, this AC installation can look a bit kludged together if you are concerned with appearances. Me, I just enjoy the cold cabin.
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thataway



Joined: 02 Nov 2003
Posts: 21469
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
PostPosted: Sun Jan 15, 2023 4:41 pm    Post subject: Reply with quote

Quote:
Powered by a 2200 Honda EU, burns 1 gallon of gas for 5.5 hours of coolness.


Do you use an easy-start system on the 13,500 AC unit?

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Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL
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ssobol



Joined: 27 Oct 2012
Posts: 3580
City/Region: SW Michigan
State or Province: MI
C-Dory Year: 2008
C-Dory Model: 22 Cruiser
Vessel Name: SoBELLE
Photos: SoBelle
PostPosted: Sun Jan 15, 2023 7:15 pm    Post subject: Reply with quote

-Waypoint- wrote:
... Powered by a 2200 Honda EU, burns 1 gallon of gas for 5.5 hours of coolness. ...


FWIW. It is pretty easy to set up a Honda gen to run off an external tank. I have a 3 gallon boat tank that I connect to my gen. Cruised the Erie canal in Aug. and didn't use much of it running the AC.
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-Waypoint-



Joined: 02 Nov 2019
Posts: 123
City/Region: Jensen Beach, Florida
State or Province: FL
C-Dory Year: 1998
C-Dory Model: 22 Cruiser
Vessel Name: Waypoint
Photos: Waypoint
PostPosted: Mon Jan 16, 2023 8:48 am    Post subject: Reply with quote

I installed the easy starter in the rooftop ac. I did this install for a smaller Generac 2000EU generator. The Generac would not start the ac even with this. I believe that Generac inflated the numbers on this generator. So I bit the bullet and went for the new Honda 2200EU. After watch reviews on youtube about the Honda, it appears that it will start and run a 13,500 btu roof top ac with out the Easy Start installed. I haven't tested this, because there are advantages with having the easy starter other than for the generator and kept it in the ac unit.
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daninPA



Joined: 16 Aug 2020
Posts: 249
City/Region: MOUNT JOY
State or Province: PA
C-Dory Year: 1994
C-Dory Model: 22 Cruiser
Vessel Name: NAVIRE
Photos: daninPA
PostPosted: Mon Jan 16, 2023 9:34 am    Post subject: Reply with quote

-Waypoint- wrote:
I installed the easy starter in the rooftop ac. I did this install for a smaller Generac 2000EU generator. The Generac would not start the ac even with this. I believe that Generac inflated the numbers on this generator. So I bit the bullet and went for the new Honda 2200EU. After watch reviews on youtube about the Honda, it appears that it will start and run a 13,500 btu roof top ac with out the Easy Start installed. I haven't tested this, because there are advantages with having the easy starter other than for the generator and kept it in the ac unit.


Thanks for this post -- I wasn't sure if the Easy Start made sense for us as the Dometic A/C unit runs off the Yamaha EF2200 Generator (18.3 amps @ 120V)
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thataway



Joined: 02 Nov 2003
Posts: 21469
City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
PostPosted: Mon Jan 16, 2023 11:34 am    Post subject: Reply with quote

daninPA wrote:


Thanks for this post -- I wasn't sure if the Easy Start made sense for us as the Dometic A/C unit runs off the Yamaha EF2200 Generator (18.3 amps @ 120V)


The Micro-aire Easy Start should allow you to run the Honda 2200 on eco mode to run the 13,500 AC. It also allows the generator to drop back to idle when the compressor is not running. Thus your fuel usage should drop significantly.

I see that Dometic has two new 12 volt roof air conditioners. These appear to be used for vans,, and small travel trailers.
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daninPA



Joined: 16 Aug 2020
Posts: 249
City/Region: MOUNT JOY
State or Province: PA
C-Dory Year: 1994
C-Dory Model: 22 Cruiser
Vessel Name: NAVIRE
Photos: daninPA
PostPosted: Mon Jan 16, 2023 12:13 pm    Post subject: Reply with quote

thataway wrote:
The Micro-aire Easy Start should allow you to run the Honda 2200 on eco mode to run the 13,500 AC. It also allows the generator to drop back to idle when the compressor is not running. Thus your fuel usage should drop significantly.

I see that Dometic has two new 12 volt roof air conditioners. These appear to be used for vans,, and small travel trailers.


Thanks for the feedback, although our infrequent use (so far) means for us the C/B ratio (Easy Start / fuel cost) isn't positive.

Our unit is the low-profile 12v meant for R/Vs, but it's worked fine on the CD.

Are there any other benefits? Does the Easy Start prolong the life of the A/C unit?
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-Waypoint-



Joined: 02 Nov 2019
Posts: 123
City/Region: Jensen Beach, Florida
State or Province: FL
C-Dory Year: 1998
C-Dory Model: 22 Cruiser
Vessel Name: Waypoint
Photos: Waypoint
PostPosted: Mon Jan 16, 2023 3:31 pm    Post subject: Reply with quote

I don't think the easy start prolongs the life of the ac. It means that it's easy on the start up amperage draw. The advantage of having one is that you can run your big rooftop ac on a standard 15 amp 120v plug without popping the breaker. So no need for 30amp service at the dock or campground anymore. The Honda app on my phone shows start up 300 amps. for the fan, then slowly starts the compressor and brings everything up to 1586 amps. This takes up to 3-4 seconds for the ac to fully come up to the full draw. The hotter it is outside the harder the compressor is to start.
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daninPA



Joined: 16 Aug 2020
Posts: 249
City/Region: MOUNT JOY
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C-Dory Year: 1994
C-Dory Model: 22 Cruiser
Vessel Name: NAVIRE
Photos: daninPA
PostPosted: Mon Jan 16, 2023 3:42 pm    Post subject: Reply with quote

-Waypoint- wrote:
I don't think the easy start prolongs the life of the ac. It means that it's easy on the start up amperage draw. The advantage of having one is that you can run your big rooftop ac on a standard 15 amp 120v plug without popping the breaker. So no need for 30amp service at the dock or campground anymore. The Honda app on my phone shows start up 300 amps. for the fan, then slowly starts the compressor and brings everything up to 1586 amps. This takes up to 3-4 seconds for the ac to fully come up to the full draw. The hotter it is outside the harder the compressor is to start.


300 amps on startup? 1586 to run?

Shocked
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thataway



Joined: 02 Nov 2003
Posts: 21469
City/Region: Pensacola
State or Province: FL
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C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
PostPosted: Mon Jan 16, 2023 4:32 pm    Post subject: Reply with quote

Quote:
Our unit is the low-profile 12v meant for R/Vs, but it's worked fine on the CD.


A Easy Start would probably not be of much value on the 6800 BTU and 4100 BTU 12 DC volt models. Are you sure that you have a true 12volt unit, with no AC 120 Volt power? What is the BTU of your unit? For example many have the Polar Cub which is 9200 BTU on C Dorys.

Quote:
300 amps on startup? 1586 to run?


I suspect he means watts, not amps. The 13,500 Roof AC generally are in the 13 +/- amp range. Watts would be correct for the draws.
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-Waypoint-



Joined: 02 Nov 2019
Posts: 123
City/Region: Jensen Beach, Florida
State or Province: FL
C-Dory Year: 1998
C-Dory Model: 22 Cruiser
Vessel Name: Waypoint
Photos: Waypoint
PostPosted: Mon Jan 16, 2023 5:11 pm    Post subject: Reply with quote

Sorry watts not amps.
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ssobol



Joined: 27 Oct 2012
Posts: 3580
City/Region: SW Michigan
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C-Dory Year: 2008
C-Dory Model: 22 Cruiser
Vessel Name: SoBELLE
Photos: SoBelle
PostPosted: Mon Jan 16, 2023 5:18 pm    Post subject: Reply with quote

The Dometic website says that the 2000 model needs 19 amps in ECO mode and the 1000 model only needs 18 amps in ECO mode.

These units are around $3000.
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daninPA



Joined: 16 Aug 2020
Posts: 249
City/Region: MOUNT JOY
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C-Dory Year: 1994
C-Dory Model: 22 Cruiser
Vessel Name: NAVIRE
Photos: daninPA
PostPosted: Mon Jan 16, 2023 5:26 pm    Post subject: Reply with quote

ssobol wrote:
The Dometic website says that the 2000 model needs 19 amps in ECO mode and the 1000 model only needs 18 amps in ECO mode.

These units are around $3000.


Not sure about that (it came with the boat when I bought it). Of course, the model # are different each year, but it's very similar to this one:

https://www.dometic.com/en-us/outdoor/rv-and-van/rv-air-conditioners/dometic-penguin-ii-high-efficiency-74975
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daninPA



Joined: 16 Aug 2020
Posts: 249
City/Region: MOUNT JOY
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C-Dory Model: 22 Cruiser
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PostPosted: Mon Jan 16, 2023 5:27 pm    Post subject: Reply with quote

-Waypoint- wrote:
Sorry watts not amps.


Thanks for clarifying! Smile
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daninPA



Joined: 16 Aug 2020
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City/Region: MOUNT JOY
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Photos: daninPA
PostPosted: Mon Jan 16, 2023 5:32 pm    Post subject: Reply with quote

thataway wrote:
A Easy Start would probably not be of much value on the 6800 BTU and 4100 BTU 12 DC volt models. Are you sure that you have a true 12volt unit, with no AC 120 Volt power? What is the BTU of your unit? For example many have the Polar Cub which is 9200 BTU on C Dorys.


Good question -- I will confirm tomorrow, as I plan to climb around and do some measurements for solar panel and NMEA 200 installation projects. I checked the manual but it's rather generic (it suggests reading the data plate on the unit).
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