Electronic central air conditioner thermostat

by:Edison      2020-08-20

central air conditioner hvac thermostat is to control the temperature of the air conditioning room electrical switchgear. Central air conditioner thermostat controlled by the temperature range of air conditioning room in 18 ℃ - commonly - 28℃。 Window air conditioner commonly used principle of central air conditioner thermostat is pressure to promote contact with broken. Its structure by corrugated pipe, thermal bag ( Test tube) , eccentric, micro switch, etc to form a sealed induction system and a transmit signal power system.

control methods generally fall into two kinds; One is controlled by the temperature change of the object being cooled for, use steam pressure type more central air conditioner thermostat, another by the control to the change of temperature of the cooling object, use the electronic central air conditioner thermostat. is divided into:

mechanical are divided into: steam pressure type thermostat, liquid expansion thermostat, gas adsorption type thermostat, metal expansion type thermostat.

the vapor pressure thermostat is divided into: gas type, liquid gas mixed type and liquid type. Home air conditioning mechanical is given priority to with this type of thermostat.

electronic type can be divided into: resistive temperature controller and thermocouple temperature controller.

the role of the circuit system:

the role of air conditioner system is to control the air conditioning and multi-function run normally, protect the normal operation of the compressor and fan motors. Circuit system of the main components are: central air-conditioning thermostat, thermal protector, master switch, running capacitor, fan motor running capacitor are fixed inside the control box, etc. Left is used by type air conditioner electrical circuit diagram. The role of fan coil thermostat just control the start and stop of compressor.

work

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 suction 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 central air conditioner hvac thermostat

electronic central air conditioner hvac thermostat ( 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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