The air conditioning system consists of two 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 whole system is supplied with 230V AC, and driven by a magnetothermal switch located on the main electrical panel of the crew area. The compressors set are located in the engine room on the starboard and port side.
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 further information on use and maintenance, please refer to the manufacturer’s manual.
Before starting the system, check the sea-water and circulation pumps for free rotation, by rotating the cooling fan of the electric motor with a screwdriver. Rotation should be free, in case the pump is locked, do not start, but eliminate troubles first (dirt, rust, scraps, etc..).
Check that sea-water intake and outlet valves are both open.
Check the correct rotation of sea water and treated water pumps, by looking at the arrow that is marked on the pump body.
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.
At the compressor start the running light will switch on together with the hour meter.
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.
CAUTIONWhen 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
