The fan coil unit plus fresh air system is divided into two parts, the central air-conditioning fan coil unit and the fresh air system. According to the external static pressure of the fan coil, it can be divided into standard type and high static pressure type, and according to the number of heat exchange coils, it can be divided into two rows and three rows. Fan coil unit is referred to as fan coil unit. It is one of the end devices of the air-conditioning system and consists of small fans, motors and coils (air heat exchangers).
Fan coil unit is referred to as fan coil unit. It is one of the end devices of the air-conditioning system and consists of small fans, motors and coils (air heat exchangers). When cold water or hot water flows through the coil, it exchanges heat with the air outside the coil to cool, dehumidify or heat the air, thereby adjusting the indoor air parameters. It is a common cooling and heating terminal equipment. The classification and characteristics of coils can be divided into vertical, horizontal, wall-mounted, cassette and so on according to the structure. Among them, vertical type is divided into column type and low type; according to the installation method, it can be divided into exposed installation and concealed installation; according to the direction of water inlet, it can be divided into left type and right type. The wall-mounted coil units are all surface-mounted units with compact structure and good appearance, which can be directly hung on the wall. Cassette type (ceiling embedded) unit, beautiful air inlet and outlet are exposed under the ceiling, fans, motors, coils are on the ceiling, it is a semi-exposed unit. All exposed units have beautiful enclosures with their own air inlets and outlets and are installed in the room.

With the help of the coil unit, the indoor air is continuously circulated to be cooled or heated through the coil, thereby maintaining the desired temperature and relative humidity in the room. The cold or hot water used by the vertical concealed fan coil unit is supplied by a centralized cold and heat source. At the same time of the fan coil unit, the fresh air centrally processed in the fresh air air conditioning room is transported to each air conditioning room through the dedicated fresh air pipeline to meet the hygienic requirements of the air conditioning room. Compared with the centralized system, the coil air conditioning system has no large air pipes, only water pipes and small fresh air pipes, which has the advantages of convenient layout and installation, small building space occupation, and good independent adjustment. It is widely used in comfortable air conditioning systems with low temperature and humidity accuracy requirements, many rooms, small rooms, and independent control. The working principle of the coil is not as complicated as the central air conditioner. In fact, we can think of the fan coil unit as an electric fan, but the wind blown by this electric fan is the temperature we need. The structure of the coil unit Fan: driven by a one-way multi-speed low-noise induction system motor, by adjusting the input voltage to change the fan speed, the fan air volume is divided into three levels: high, medium and low.