Multi-split central air conditioning system for simultaneous cooling and heating

A multi-split central air conditioning system for simultaneously performing cooling and heating, comprising a condensation module, a plurality of indoor fan coils, a high-pressure flow pipe, a medium-pressure flow pipe, a low-pressure flow pipe, and an evaporation module, wherein the condensation module comprises a compressor, a condenser, and a liquid storage tank which are connected in a listed sequence, and the high-pressure flow pipe is connected with an exhaust end of the compressor;

• the medium-pressure flow pipe is connected with the liquid storage tank and the evaporation module;
• the low-pressure flow pipe is connected with a suction end of the compressor and the evaporation module;
• the plurality of indoor fan coils are connected with the high-pressure flow pipe through a first branch pipe, connected with the low-pressure flow pipe through a second branch pipe, and connected with the medium-pressure flow pipe through a third branch pipe, wherein a first solenoid valve is provided on the first branch pipe, and a second solenoid valve is provided on the second branch pipe.