Hotel central air conditioning only has power button, air volume button and temperature adjustment button, but there is no hot key for refrigeration. Why?

It is normal that the central air conditioner in the hotel has no hot key for heating, for the following reasons:

1. The cooling and heating modes of the hotel's large central air conditioner are all controlled by the computer room, and all cold air or heating flows through the pipes at both ends. Unlike a home computer, this computer cannot control the cooling and heating modes at its terminal.

2. Because the central air-conditioning hosts are large units, each unit needs to provide air conditioning or heating for multiple indoor fan coils. If there are multiple internal units under a mainframe, wouldn't it be a mess if this room is equipped with refrigeration and that room is equipped with heating?

3. Because most of the central air-conditioning fan trays in the hotel are water-cooled, it is only necessary to set an electromagnetic valve in the indoor room to control whether the water conveying cold air or heating flows through the fan coil of the indoor unit, and then the indoor wind speed can be selected. The adjustment of the set temperature is to control the opening and closing of this solenoid valve, thus determining whether the indoor unit will continue to exhaust air or heat.