Precautions before installing a horizontal concealed fan coil unit: When the indoor heat load changes and the indoor temperature needs to remain constant, the room's air supply volume can be kept constant by changing the air supply temperature to adapt, or the air supply temperature can be fixed to adapt by changing the air supply volume to maintain the same annual air supply volume. The all air system that adapts to changes in air conditioning load by changing the air supply temperature becomes a constant air volume system.
        The system that maintains the same supply air temperature or parameters and adapts to changes in air conditioning load by changing the supply air volume is called a variable air volume system. According to the Chinese standard GB50189-2005 Energy saving Design Standard for Public Buildings, in the same air conditioning system, the load difference and variation of each air conditioner are large, the low load operation time is long, and the temperature of each air conditioning zone needs to be controlled separately.
        In the case where cold air needs to be supplied throughout the year in the building, the all air air conditioning system should use a VAV system fan coil unit. The inlet cold water temperature of the unit should not be lower than 5 ℃, otherwise it may cause condensation of the unit; The temperature of the incoming hot water should not exceed 80 ℃ (usually 60 ℃), otherwise it may cause corrosion of the copper pipes of the unit heat exchanger.
        Suggested operating environment temperature for fan coil units: 16-36 ℃ for cooling and 10-30 ℃ for heating; The relative humidity of the air is 90%. The fan coil unit is only used for comfort air conditioning and should not be used in special occasions. Do not install fan coil units in areas with corrosive gases. Customers of Shandong fan coil units must identify and avoid seeking distant solutions, striving to obtain fan coil units with high cost-effectiveness. The unit should be installed by personnel familiar with the relevant products and local laws and regulations.