Thermostat (Thermostat), according to the temperature changes in the working environment, physical deformation occurs inside the switch to produce some special effects, resulting in a series of automatic control components, also known as the temperature switch, temperature protector, temperature controller, referred to as the thermostat. Or through the temperature protector will be the temperature to the temperature controller, the temperature controller to send a switch command, so as to control the operation of the equipment in order to achieve the desired temperature and energy-saving effect, the scope of its application is very wide, according to the different kinds of thermostats used in home appliances, motors, refrigeration or heating, and so on in many products.

Its working principle is through the temperature sensor on the ambient temperature automatically sampling, instant monitoring, when the ambient temperature is higher than the control setpoint when the control circuit is activated, you can set the control back difference. If the temperature is still rising, when it rises to the set overrun alarm temperature point, start the overrun alarm function. When the controlled temperature can not be effectively controlled, in order to prevent the destruction of equipment can also be tripped by the function to stop the equipment to continue to run. Mainly used in the power sector to use a variety of high and low voltage switchgear, dry-type transformers, box-type substations and other related temperature using the field.

Wiring method

Take a close look at the three feet on the thermostat, they are all useful in both English letters and numbers instead of two methods, respectively: H (6), L (3), C (4).

H (6) connects to the brown wire, which is the power supply's fire wire;

L (3) connects to the gray wire, which is the light's fire wire;

C (4) connects to the white wire, which is the compressor's fire wire.

Control method

The control method is generally divided into two kinds; one is controlled by the temperature change of the object to be cooled, mostly using vapor pressure type temperature controller, and the other is controlled by the temperature difference change of the object to be cooled, mostly using electronic temperature controller.

The fuzzy control techniques it uses such as PID control, P (Proportional) proportional + I (Integral) integral + D (Differential) differential control.

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