Climate systems – OEM quality for retrofitting
 Unwinding after a marvellous day at sea …
Regardless of whether it’s cold or hot outside – you enjoy a perfect climate. The Dometic air conditioner cools or heats your cabin, simultaneously it filters the air and reduces the humidity level. With powerful, efficient and environment-friendly technology in original equipment quality – the outcome of fifty years of experience in boat air conditioning. Dometic marine climate systems are available in two performance categories, 5,000 or 15,000 BTU/h. Retrofitting is worthwhile in every respect.
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Marine climate systems for retrofitting
It’s all included in the kit: MCS 5 and MCS 15 are self-contained air conditioners with all A/C components mounted on a single chassis – this saves space and cost. Air ducts, seawater pump, electrical box, control panel, all components required for installing and using your marine climate system is included in the delivery kit. The ideal retrofit solution for smaller yachts and boats. |
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Accessories for marine climate systems
Cooling or heating two cabins with one air conditioner – it’s possible with the Dometic MCS 15 in combination with the optional dual air distribution kit, which neatly adapts to the MCS15. |
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How to select unit size
Selecting the right climate system for your application depends on the size of the room to be conditioned and in which part of the boat it is located. A cabin below deck will require less capacity per square metre of room area than an upper-deck cabin with large windows directly exposed to the sun. Our calculations assume an average headroom of two metres and ambient temperatures of 20°C to 35°C.
| Maximum air conditioned room size (at ambient temperatures of 20 – 35°C) |
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Below deck (no windows) |
Mid deck (small windows) |
Above deck (large windows) |
| Dometic MCS 5 |
8 m² |
5 m² |
4 m² |
| Dometic MCS 15 |
23 m² |
15 m² |
12 m² | |
 Compact, seawater-cooled, installer-friendly:
the new Dometic marine climate systems have been designed for retrofitting.
Depending on the size of the cabin you can choose between a 5,000 or 15,000 BTU/h model. If you opt for the MCS 15 and add the dual air distribution kit you can condition two cabins at the same time. Dometic marine climate systems also provide heating. Efficient heat pump technology makes sure it works at water temperatures as low as 6°C. Additionally, the air conditioner dehumidifies the air.
The high-velocity fan generates a powerful and quiet air flow. The blower outlet can be adjusted horizontally and vertically, depending on the installation conditions.
An easy-to-use control panel for all essential functions adds the finishing touch to your comfort climate solution.
 Reduced starting current
 The Dometic MCS 15 air conditioner has real power – and therefore also has a higher compressor starting current. This can however be reduced by up to 65% using the new Dometic SmartStart soft starter. It makes starting absolutely problem-free even at moorings with low electrical circuit protection. This compact solution can be quickly and easily integrated into new or existing systems.
How it works and how it’s installed
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Dometic MCS 5 and MCS 15 marine climate systems work on the heat pump principle, so they can be used for cooling as well as for heating.
As with all air conditioners, their operation is based on the transfer of heat. In cooling mode heat is extracted from the cabin air, transferred to the refrigerant and then released into the seawater. In heating mode, the cycle is simply reversed – from the seawater into the cabin. It even works in water temperatures as low as 6°C.
The diagram on the left shows a typical installation layout for the Dometic MCS 15. This unit allows air conditioningor heating of two cabins by ducting the air flow in two directions with the optional air distribution kit.
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1) A/C unit MCS 15
2) Control panel
3) Supply air grille
4) Return air grille
5) Air duct, insulated |
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Correct installation of the air distribution system
Once you have selected a good place for the air conditioner (e.g. under a settee, in a piece of furniture or under a V-berth) and mounted it , you connect the insulated air ducting.
The return air grill should be installed close to the A/C unit, in the lower part of the cabin – the supply air grill should be placed as high as possible [ cool air falls ] and as far away from the return air grill as possible to ensure good air circulation.
Seawater connection – important things for you to note
The seawater components must be installed below the water line – with a steady upward incline from the through-hull inlet through the strainer and pump to the A/C unit.
This prevents air becoming trapped in the seawater components. The discharge from the A/C unit to the seawater outlet should be as short and direct as possible to a point just above the water line.
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CORRECT: The pump is installed under the water line. A steady upward flow from the through-hull inlet to the A/C unit is provided. The discharge from the A/C unit to the hull outlet shows a slightly downward flow. All hoses are laid correctly (without kinks and loops) and secured with double clamps. |
INCORRECT: The hoses have kinks, loops or high/low spots where air can be trapped. The seawater strainer must be installed below the pump. The hose connections are secured with single clamps only. |
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