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     The heating device is the key link to control whether the constant temperature and humidity machine needs to be heated; the controller outputs voltage to the relay when it gets the temperature rising command, and there is about 3-12v DC added to the solid-state relay; its AC end is equivalent to the wire connection; the contactor also sucks in the voltage at both ends of the heater to make it heat up, which is driven by the circulating fan to bring the heat to the machine Temperature constant humidity machine temperature rise. 　　

&Cooling is an important part of the constant temperature and humidity machine, which directly affects the performance of a constant temperature and humidity machine, including compressor, condenser, throttling device and evaporator. The compressor is the heart of the refrigeration system. It inhales low-temperature and low-pressure gas, turns into high-temperature and high-pressure gas, and then condenses into liquid to release heat, and then takes away the heat through the fan. Therefore, under the machine is the reason for hot air, and then it becomes low-pressure liquid through throttling, then becomes low-temperature and low-pressure gas through the evaporator, and finally returns to the compressor; the refrigerant absorbs heat in the evaporator to complete gasification Process, so as to absorb heat, achieve the purpose of refrigeration, and complete the cooling process of constant temperature and humidity machine.