Multi-connected air conditioning unit

The invention provides a multi-connected air conditioning unit. The multi-connected air conditioning unit comprises a refrigerant loop, a water system heat exchange module, a first electromagnetic valve, a second electromagnetic valve and a controller. One end of the water system heat exchange module communicates with the four-way valve, and the other end of the water system heat exchange module communicates with the throttling element; the first electromagnetic valve is arranged between the water system heat exchange module and the four-way valve; one end of the second electromagnetic valve is connected between the first electromagnetic valve and the water system heat exchange module; a switch; the controller is connected to the switch, the first electromagnetic valve, the second electromagnetic valve and the four-way valve, and the controller is configured to receive a control signal output by the switch, control communication of a valve port of the four-way valve and opening or closing of the first electro