Horizontal concealed fan coil units main control parameters chosen rated air volume, export static pressure, input power, rated cooling capacity, rated for heat, noise, water resistance and so on. For dual control water system (applicable only on a seasonal basis or only by air-conditioned area heating or air conditioning system cooling transformation) of fan coil units, only one set of coil configuration, winter heating / cooling dual-purpose models. Jingjiang too Island air-conditioning plant 13,952,621,184 weeks. For the four control water system (for heating / cooling air conditioning system frequently conversion) of fan coil units, heating and cooling should configure two coils combined models.