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central air conditioner hvac thermostat manufacturer - Central air conditioner thermostat works
steam pressure type
action of bellows in spring, spring tension is controlled by a knob on the panel, the capillary on the air conditioner indoor air inhaled FengKouChu, react to the indoor cycling return air temperature. When the room temperature rising to the setting temperature, thermal dose of gas expansion of capillary and bellows, bellows elongation and overcome the spring tension connected the switch contact, the compressor operation, refrigeration system, until the room temperature and fell to the set temperature, the heat pack gas contraction, corrugated pipe shrinkage action with spring and puts switch off position, make the compressor motor circuit is cut off. This action repeatedly, so as to achieve the goal of control room temperature.
electronic temperature controller
electronic temperature controller, Resistive) Is using the resistance method to measure the thermal, generally USES the white gold, copper, tungsten, and semiconductor ( Thermistors, etc. ) As the temperature resistance, the resistance of each has its optimum point. Most household air conditioning sensor based on thermal resistance type.
thermistor thermostat is made according to the principle of wheatstone bridge, ( Left) Is a wheatstone bridge. On both ends of BD E the power is connected, according to the kirchhoff's law, as the bridge of the resistor R1 * R3 and R4 = R2 potential of two points A and C are equal, the output end there is no current flows through the between A and C, the impedance of the thermal resistor R1 vary with ambient temperature increase or decrease the size of the change, the balance is damaged, between the AC output current. Therefore, when a thermostat, can easily by selecting the appropriate thermistor to change the temperature adjusting range and working temperature.
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