The main unit can be installed on the ground, roof or wall. If it is installed on the ground or wall, in order to ensure that the heat absorption and heat dissipation of the heat exchanger of the mainframe is not hindered, the distance between the mainframe and the surrounding wall or other obstacles should not be too small, and the foundation of the equipment should be prepared. The equipment should be installed on the ground and fixed with expansion bolts. If installed on the roof, the load-bearing capacity of the roof should be considered. Roofs that do not meet the load-bearing requirements are not allowed to be installed. If it can be installed on the roof, attention should be paid to the outlet direction of the air source heat pump. The outlet direction of the main unit should be set in the downwind direction, and the heat exchange effect of the body is better.