The air conditioning system generally consists of four parts: a refrigeration system, a heating system, a ventilation system, and a control system. Whether the refrigeration system is put into operation is marked by whether the electromagnetic clutch 125 of the compressor is energized or not; whether the heating system works or not depends mainly on whether there is circulating hot water from the heater in the heater radiator. Whether it is cooling, heating or ventilation, the blower 131 (or 120) is put into action. The operating mechanism is to change the direction and opening of the airflow through the circuit switch, the lever (knob) to pull the wire (or use the vacuum solenoid valve), to achieve the purpose of adjusting the indoor temperature and humidity, such as maintaining the indoor temperature at 18-27T, humidity 40 -70%.
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