The air conditioning system consists of an air conditioner group consisting of 2 chiller unit, which can be used either individually or at the same time. The internal heat exchanger with seawater, is capable of delivering both cold air and hot without the use of a water heater (by reversing the operation of the system).
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.
A circulation pump conveys cooled (or heated) fresh water to the fan-coils, until the set temperature is reached.
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 at 230V AC by means of a magneto-thermal switch located on the general electrical panel in the engine room. The compressor unit is located under the aft garage on the starboard side.
To power the chilling unit, activate the button on the separated control panel.
The air conditioning system can be controlled and monitored Even through the monitoring system.
Your yacht can be equipped with three air handling units (AHU).
The AHU manages air treatment and exchange in your yacht’s rooms.
In general, during winter the AHU is responsible for increasing air temperature and humidity, while in summer it decreases the temperature and humidity of the air.
Every room has air-conditioned independent adjustment via Its Command Panel. The descriptions and information on the use and maintenance are described in the manual supplied by the manufacturer.
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.
Apply power to the refrigeration unit and to the fan-coils by means of the switches arranged on the main control panel in the technical room.
CAUTIONOn the main electrical panel there are two circuit breakers AIR CONDITIONING and FANS FAN-COIL, both must be in the ON position to operate correctly the air conditioning system.
Check the correct rotation of the sea water pumps and water treated, observing the arrows located on the body of the same pumps.
The group operates normally only when the sea water circulation and the treated water is correct. After a few seconds, the compressor will start. At the start of the compressor, it will turn the operation lamp on the framework.
Its operation will stop when reaching a temperature of 7÷8°C for chilled water. The chilled water temperature can be controlled by means of the appropriate control panels located in the engine room.
The chilled water circulation pump will circulate water to the different fan-coils.
Fan-coils will exchange heat with the surrounding environment, the return water will be heated and the thermostat will restart the compressor, in a differential range of 3÷4°C, thus keeping the chilled water temperature in a range from 7 to 11°C.
WARNINGThe cleaning of the sea intake strainer must be performed with a periodicity related to the use of the system and by the conditions of the aspirated water.
CAUTIONBefore cleaning the strainer, remember to close the sea cock valve, to stop the unit and then proceed with maintenance. Once this operation is finished, remember to open the valve which supplies the cooling circuit.
For further information on use and maintenance, please refer to the manufacturer’s manual.
Air conditioning system diagram
