The air conditioning system consists of a conditioning unit with heat pump equipped with inner heat exchanger that cools (or heats in winter) the fresh water of a closed circuit. This unit is used to cool water used as a thermal exchange with the air of the rooms to be cooled down.
In winter the inversion of the cooling circuit (by heat pump) allows the water heating instead of the cooling, in this way the rooms get warmed up.
The fresh water, by means of a circulation pump, delivers cooled (or heated) water to the fan-coils until it reaches the set temperature.
WARNINGCheck that fresh water circulates regularly. Because of a pressure drops or of a long period of inactivity, stop the system and top up water through supply valve until the requested pressure is achieved, this will be indicated by proper pressure switch installed on the unit. After this, close the supply valve.
The entire system is powered by 230VAC, and is controlled by a magneto-thermal on the main electrical panel in the engine room. The compressor unit is located in the engine room under the garage.
Each conditioned room is equipped with self-adjusting control panel.
CAUTIONTwo magneto-thermal switches for AIR CONDITIONING and FAN COIL BLOWERS are installed on the main electrical panel, both switches must be set to ON, in order to operate the air conditioning system correctly.
For operation and maintenance descriptions and information, please refer to the relevant Manufacturer’s Manual.
Before starting the system, check the free rotation of the sea water pump and the circulation pump.
Rotation should be free, in case the pump is locked, do not start, but eliminate troubles first (dirt, rust, scraps, etc..).
Check that the sea water inlet and outlet valves are both open. Power the chiller using the selector located on the separate electrical panel.
It is advisable to check the power absorbed by the pumps and to compare it with the plate data.
The unit will work normally if the circulation of sea water and treated water is correct. After a few seconds the compressor will start.
Its operation will stop when reaching the temperature of chilled water 7 to 8°C. The temperature of the chilled water can be checked by suitable thermometers placed on the unit. The cooled water temperature can be set by means of the thermostat on the unit’s control panel. The chilled water circulation pump will circulate water to the different fan-coils. Fancoils will exchange heat with surrounding ambient, the return water will be heated and the thermostat will automatically start the compressor, in a differential range of 3 to 4°C, thus keeping the chilled water temperature in the range from 7 to 11°C.
CAUTIONClean the strainer of the sea cock according to the time interval of the system use and to the pollution conditions of the sucked waters (seaweeds, mucilage’s, etc..).
CAUTIONBefore cleaning the strainer, remember to close the sea cock valve, to stop the generator and then proceed with maintenance. Once this operation is finished, remember to open the valve which supplies the cooling circuit.
CAUTION
When the yacht is connected to the shore socket, due to the limited power that can be drawn from the 200 V-50 A socket (equal to 10 kVA), it is necessary to limit the maximum power absorbed by the A/C unit, excluding at least one of the three compressors; this is to prevent the thermal protection from tripping.
For further information on use and maintenance, please refer to the manufacturer’s manual.
CAUTION
When starting the unit after a prolonged shut down check the correct operation of the sea water pump and make sure of proper circulation.
CAUTIONThe excessive use of conditioned air may cause infirmities due to the great difference of temperature between the yacht inside and the outside.
CAUTIONNever clog the temperature sensors located in each air conditioned room; as their clogging could impair the correct operation of the system.
Air conditioning system diagram:
