vided by the user. When selecting the installation location of the combined air-conditioning unit, the maintenance space of more than 1 meter and the installation space of water and air pipes should be reserved.

When assembling the modular air conditioning unit, rubber and plastic sealing strips are used to seal the functional sections, and bolts are used to lock them tightly to prevent air leakage. Sealant can be applied to the connection if necessary. After the assembly of each component, the internal sundries must be removed. The water pipe of the external connection pipeline must be cleaned before it is connected with the inlet and outlet water pipe of the air conditioning unit to avoid blocking the heat exchanger pipeline. All inlet and outlet water pipes shall be installed with valves and live joints outside the combined air-conditioning unit, and the weight of valves, pipes and equipment externally connected to the unit shall not be borne by the unit; The motor shall be connected to the power supply with protective devices, the shell of the combined air conditioning unit shall be connected to the ground, and the motor starting mode of more than 15KW shall be step-down starting; The condensate drain pipe of the surface cooler shall be installed with water seal to ensure smooth drainage. The water seal shall be provided by the user; The heat exchanger with cold and hot water as medium has water inlet pipe at the bottom and water outlet pipe at the top. The upper part of the heater is the inlet pipe and the lower part is the outlet pipe. The designed working pressure of the surface cooler is 1.6mpa and the steam heater is 1.0mpa.