Instruction Working principle and features:The fan coil unit (FCU as below) have no energy itself but through pipeline of central air conditioner supplying with chilled or cooled water into the copper tube of heat exchanger inside house, and the fan blow through the heat exchanger to cool or heat the temperature of the house. The FCU is characterized with energy-saving, high efficiency, low noise, reliable and convenient to select and install. Model:FP-WA series horizontal inside type FCU have r