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A Fan Coil Unit (FCU) is a simple device consisting of a heating and/or cooling heat exchanger or 'coil' and fan. It is part of an HVAC system found in residential, commercial, and industrial buildings. A fan coil unit is a diverse device sometimes using ductwork, and is used to control the temperature in the space where it is installed, or serve multiple spaces.
Fan coils are what they sound like in wording. A fan blowing air over a heat exchanger or so called coil. There can be one or two coils-one for heating & one for cooling.If it is only one for cooling, it will be 2 pipe system, if it have both cooling coil and heating coil, then it is a 4 pipe system.eport Abuse. In the outside fan coil unit: - In the compressor, compression increases the temperature of the refrigerant gas. In the condenser, the forced air flow from the fan first cools then condenses the gas to a high pressure, liquid refrigerant..