What are the types of central air conditioning thermostat
The air conditioning temperature controller is an electric switch device that controls the temperature of the air conditioning room. There are two types of central air-conditioning temperature controllers: electronic and mechanical. Different types of central air-conditioning temperature controllers have different working principles.
The air conditioning temperature controller is an electric switch device that controls the temperature of the air conditioning room. There are two types of central air-conditioning temperature controllers: electronic and mechanical. Different types of central air-conditioning temperature controllers have different working principles.
Mechanical thermostat can be divided into vapor pressure thermostat, liquid expansion thermostat, gas adsorption thermostat and metal expansion thermostat. The steam pressure temperature controller can be divided into gas filled type, liquid gas mixed type and liquid filled type. This kind of thermostat is the main mechanical type of household air conditioners.
When the steam pressure temperature controller works, the action of the bellows acts on the spring. The spring force is controlled by the knob on the control panel. The capillary tube of the pipe wooden support is placed at the air inlet of the indoor air conditioner to react to the temperature of the indoor circulating return air.
When the room temperature rises to the set temperature, the temperature sensing agent gas in the capillary tube and bellows expands to make the bellows extend and overcome the spring force to connect the switch contact. At this time, the compressor operates and the system cools. When the room temperature drops to the set temperature again, the temperature sensing package gas shrinks, the bellows shrinks and the spring act together, and the switch is placed in the off position to cut off the motor circuit of the compressor. This action is repeated to control the room temperature.
The electronic type is divided into resistance type temperature controller and thermocouple type temperature controller.
Electronic temperature controller (resistance type) is measured by resistance temperature sensing method. Generally, platinum wire, copper wire, tungsten wire and semiconductor (thermistor, etc.) are used as temperature measuring resistors. These resistors have their own advantages and disadvantages.
Most sensors of household air conditioners are thermistor type. Therefore, when constituting the thermostat, it is easy to change the temperature adjustment range and working temperature by selecting an appropriate thermistor.