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1. GENERAL INFORMATION
1.1 APPLICATIONS
Fan coils are used to directly treat the air in the room where they are installed.
They can be used both for heating and cooling applications; in the latter case, the air is also dehumidified.
1.2 OPERATION
The effectiveness of a fan coil is due to the large surface area of the finned heat exchanger (coil) where the air drawn from
the room by the fan passes through.
Heating operation: the hot water circulating in the finned coil supplies heat to the air passing through the heat exchanger.
Cooling operation: the chilled water circulating in the finned coil removes heat from the air passing through the heat exchanger.
The air is also dehumidified and the condensed water vapour must be discharged from the unit: suitable drains must therefore
be provided to drain the condensed water that collects in the condensate tray.
1.3 PERFORMANCES
The performance of a fan coil can vary greatly with changes in the temperature and in the amount of water circulating
through the coil, as well as with changes in the temperature and in the amount of air circulating through the coil.
When using the direct expansion coil, thermal performances in cooling and heating depend on the performance of the
condensing unit connected to the fan coil.
The air volume is determined by selecting the proper fan speed (MIN-MED-MAX) through electronic or digital regulators
(also for BMS systems), while the water flow rate is determined by the specifications of the system and of the pump.
Thermal performances of the unit can be optimised by controlling the inlet flow rate of the water with proper regulating
valves (ON/OFF or modulating type), which can be supplied as accessories.
For each model, thermal performances in heating and cooling depend on the number of rows of the coil installed, which
gives the opportunity to make the air treatment suit every condition required.
In cooling function, under the same operating conditions, the more rows the heat exchanger has, the more it will dehumidify.
1.4 OPERATING LIMITS
Each fancoil can work properly only if the operating limits listed below are respected:
• Maximum operating pressure (water side): 1600 kPa
• Maximum pressure of the refrigerant fluid for fancoils with direct expansion: 2400 kPa
• Minimum inlet water temperature in cooling: 5 °C
• Maximum inlet water temperature in cooling: 20 °C
• Minimum inlet water temperature in heating: 35 °C
• Maximum inlet water temperature in heating: 85 °C
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