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Old 06-11-2014, 10:48 AM   #21
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Do you mean the air handlers fins and coils iced up? If so, that is an air flow issue in most cases.
No, it was the water to freon heat exchanger. Happened when sea temp was around 38F and air temp about 25F. Challenging for any heat pump. I don't think the air based unit would do much better. Either would need some sort of defrost cycle and I know my water based unit has no such thing.
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Old 06-11-2014, 11:12 AM   #22
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I still don't see the advantage: Using water as a heat sink usually has more favorable temperatures (cooler than the air in summer, warmer than the air in winter) which should make it easier for the water based unit to do its job. Whether that actually is the case, not sure. I've had my water based unit freeze up and that is no fun. But that might be in the execution, not a flaw in the water based concept.

They do take up deck space, and the handler inside needs wall space...

But they don't crud up from marine life and happens in nutrient rich areas ie, the Chesapeake, some ares of the Caribbean, South America, Most of the East coast.
My bud with the N57 at times has had to clean this strainers and the piping every two weeks or marine growth would choke the water flow and shut down the system.. not too bad to do the strainers.. but the hoses suck!.
Also the marine water exchanged units quit heat output at 40deg. or a bit higher water temps.. air mini units still produce into the high 20 degree air temps.

But they are fughly!

If you can hide the condenser it is a great alternative. See attached pic for N46 with two units..

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Old 06-11-2014, 11:15 AM   #23
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Beauty is in the eye of the beholder!
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Old 06-11-2014, 02:27 PM   #24
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The most common is the Mitsubishi,

Mitsubishi Minisplit AC - mitsubishipro.com‎

Adwww.mitsubishipro.com/‎
Redifining the Industry w/ our VRF Zoning and Split Ductless Systems!

Many of the brands I see at the distributors are Chinese copies.

I would stick with Panasonic or Mitsubishi .

Somehow the freon setup is different and these folks can make heat from -20F air. and not freeze solid!
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Old 06-11-2014, 02:50 PM   #25
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The most common is the Mitsubishi,

Mitsubishi Minisplit AC - mitsubishipro.com‎

Adwww.mitsubishipro.com/‎
Redifining the Industry w/ our VRF Zoning and Split Ductless Systems!

Many of the brands I see at the distributors are Chinese copies.

I would stick with Panasonic or Mitsubishi .

Somehow the freon setup is different and these folks can make heat from -20F air. and not freeze solid!
The unit I have been using at a radio tower building is a Mistubishi. It works quite well when the temperatures in our area reach 10-15 degree outside. That's one of the reasons I am considering using one on my Gulfstar.
As mentioned earlier they might be fugly, I'll agree but if they work half as well as advertised I think it's worth trying one or two on my boat.
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Old 09-11-2014, 10:00 PM   #26
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If its a heat-pump type unit it will heat when the outside air is 40and above. It may have a defrost control so if the outside coil freezes it will defrost (go from heat to cooling ) then back to heat.This will put cool air into the space .Heat pumps are good for 40 and above and will not be efficient below that temp.Electric heat will work better at40 and below. You may want to have a electric heat as the auxiliary.
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Old 09-12-2014, 12:39 AM   #27
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If its a heat-pump type unit it will heat when the outside air is 40and above. It may have a defrost control so if the outside coil freezes it will defrost (go from heat to cooling ) then back to heat.This will put cool air into the space .Heat pumps are good for 40 and above and will not be efficient below that temp.Electric heat will work better at40 and below. You may want to have a electric heat as the auxiliary.
The new mini splits can heat down into the 20deg. Air temps.. old heat pumps were not anywhere as efficent.
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Old 09-12-2014, 01:49 AM   #28
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For us cruisers and not park at the dock guys, how do you run one at night, when at anchor, genset down and temperture outside is below 40F? Diesel heat is my answer. Ditto while cruising and genset down.

I've used these split units a lot in offices, especially in Spain.
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Old 09-12-2014, 06:57 AM   #29
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>Diesel heat is my answer.<

You bet , Dickinson , no electric required , gravity fuel feed and 200G will go all winter !!
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Old 09-12-2014, 10:28 AM   #30
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I have a roof top air/ heat . Are the roof top units that are just for air smaller ? I don't really need the heat and it doesn't heat very well any way . Mine is old and loud . Who makes the quietest roof top?
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Old 09-13-2014, 07:09 AM   #31
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Who makes the quietest roof top?

Most newer units are far quieter than the old RV units.

Dometic does make a marine roof top unit , bigger bucks , but claimed to be better near salt water.????.

WE will be installing the Mini Split, although the roof was builr to accomidate the RV style when rebuilt.

The Mini is really quiet , and uses less noisemaker power when less cooling is needed.
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Old 09-13-2014, 10:42 PM   #32
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Reengineering an air conditioning unit to ďmarineĒ use. Purists should cover their e


Here's something I built a few years ago. Still works great! No issues, no troubles. If you have the space to hide machinery, this is a good option for a non marine A/C.

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Old 09-14-2014, 06:30 AM   #33
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Greetings,
Mr. m. Welcome aboard.
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Old 09-14-2014, 06:38 AM   #34
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The biggest hassle with the rebuilt unit is it requires 240V .
So in an older or smaller marina the noisemaker will still be operating 24/7 .

For folks that get off the beaten path this could be a hassle.

For a liveaboard it looks good , but does not have the low temperature efficient Heat the mini split can provide, so it would depend on Where one lives aboard.
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