Lack of treated water in pipes. Check if the pressure gauge operates at the minimum pressure of 10 m with idle system. In case the gauge reads 0, most probably there are air pockets in the circuit or water leaks. Stop the system and fill water through a cock so as to reach a pressure of 10- 15 m. Purge air by means of the relevant valves installed on the heat exchanger, the fan-coils and the manifolds, keep the purge valve open. If the treated water flows regularly, and the outlet does not release warm or cold air, check if the fan turns and if the room thermostat is set to correct summer-winter position.

Each fan-coil allows setting three speeds and an automatic speed. Select the required mode.

To obtain the desired room temperature, set the thermostat to +21, +22°C / +70, +72°F in winter cycle and to +24, +25°C / +75, +77°F in summer cycle. Refer to the instruction manual.

The treated water temperature check is performed through two digital control panels. The water temperature inside the fan-coil circuit may vary from 0 °C/32°F +60°C/+140°F and by exactly the water temperature in the fan-coil circuit.

For a good BTU/h performance, the thermometer should indicate +7 + 8 °C/+45, +46°F in summer and +45°C/+113°F in winter after 15-20 minutes of operation.
When the set temperature is reached, the compressor stops, while the treated water pump keeps running.
The compressor starts automatically when water temperature decreases by 3°C/37°F in winter cycle or increases by 3°C/37°F in summer cycle. In winter, if the sea water temperature drops below +10°C/50°F, the heating output of the unit is seriously affected.

Check the strainer located on sea water suction periodically, specially when the yacht is shored.
Never leave water in the system when the yacht is out of water.
At least once a year, it is important to have the system rinsed with fresh water for half an hour, to remove all sea water residues.

At least once every six months clean the fan-coils sucking the dust trapped in the back screen. Disassemble the filter, clean it, disinfect it and reassemble it; if broken, replace it.

Winter cycle

The units can produce hot water for heating purposes, by using the heat pump, reverse cycle principle. Just set selector on “Heat” and the unit will start producing hot water at about 45°C/113°F.
The selector acts on the solenoid valves for cycle inversion. In winter, the heating capacity of the unit depends on the sea water temperature; efficiency diminishes as sea water temperature grows colder.

WARNING

Pay attention not to damage the airtight chilling circuit.

CAUTION

The topping-up of the chilling liquid must be carried out by skilled and qualified personnel, according to the indications of the Manufacturer.

CAUTION

The air inlets of the air conditioning system must always be free; their obstruction beyond involving the system performance, can also generate serious problems.

10.1.3 Air conditioning system (maintenance)