FAN COIL UNITS | What, Where & How

What is a fan coil unit, what does it do & how does it work?… A fan coil unit is a relatively small piece of equipment that consists of a fan, a coil, and other components, that are used to cool or heat the air recirculating within a room. Some will also add fresh air to the space.

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The units are quite common and can be found in most commercial or residential applications.

Typically, to operate in cooling mode, a wall or duct-mounted thermostat will note the space temperature is over setpoint controlling a modulating/on/off valve, the fan will blow air across the chilled water coil that is fed from the building central system, with the cooled conditioned air flowing back into the room, cooling the space.

The cooling coil could also be supplied via a Direct Expansion [Dx] System using refrigerant. 

Typically, to operate in heating mode, a wall or duct-mounted thermostat will note the space temperature is below-set point controlling a modulating/on/off valve, the fan will blow air across the heating coil that is fed from the building central system, with the heated conditioned air flowing back into the room, heating the space.

The heating coil could also be an electric type.

They are pretty versatile and inexpensive, having options to be installed in concealed in ceilings, exposed [out of ceiling], underfloor, or mounted vertically against a wall.