10 - AIR CONDITIONING SYSTEM 298
10.1.3 Air conditioning system (maintenance)
No delivery of cool or warm air from fan-coils
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 ll 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
ows 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.
Fan-coils air setting
Each fan-coil allows setting three speeds and an automatic speed. Select
the required mode.
Room temperature setting
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.
Temperature check of treated water in the fan-coils circuit
The treated water temperature check is performed through two digital con-
trol 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 treat-
ed 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 win-
ter, if the sea water temperature drops below +10°C/50°F, the heating output
of the unit is seriously affected.
Sea water circuit check and cleaning
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 wa-
ter for half an hour, to remove all sea water residues.
Fan-coil cleaning
At least once every six months clean the fan-coils sucking the dust trapped
in the back screen. Disassemble the lter, clean it, disinfect it and reassem-
ble it; if broken, replace it.
Winter cycle
The groups can produce hot water through a water heater.
Simply set the selector switch to “Heat”.
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