SPECIFICATIONS

Brand Name: TENGZHIWEI

Choice: yes

High-concerned chemical: none

Lead length: 1M 2M

Material: Mixture

Origin: Mainland China

Output: Analog Sensor

Resistance value: 5K-10K-15K-20K-50K-100K

Theory: Resistance Sensor

Type: Temperature Sensor

Use: Temperature Sensor

encapsulation: Epoxy resin encapsulation

is_customized: Yes

plug: XH2.54-2Y White

Shopkeeper tips: Generally hang up with 5K- 10K more. The cabinet machine uses 10K- 20K more. The specific need to use a multimeter to measure the resistance value

The general ambient temperature sensor is a small black fin near the wall of the outdoor unit. The pipe temperature sensor is plugged into the wall of the coil inside the outdoor unit.

Copper head is the detection of copper pipe, temperature conduction fast; The rubber head is generally used to detect the ambient temperature, corrosion resistance, high reliability

How to judge the resistance value of air conditioning temperature sensor

The air conditioning circuit designer takes the normal temperature of 25 degrees as the benchmark, that is, 25%, RTl=R1, RT2=R2, and the voltage at point A and B is 2.5V. Some circuits are equipped with R3 and R4, which mainly play a buffer role. When the ambient temperature rises, the RTI resistance decreases, the voltage at point A rises, and the comparator outputs a differential pressure. After a series of processing within the CPU, the internal and external machine running state is controlled.

Large air conditioning, variable frequency air conditioning outside the control board, temperature sensor VI sampling voltage is not 2.5V, but 1/4 power supply voltage, that is, 1.25V, in fact, to determine the thermistor resistance value there is a particularly simple method, choose a 50k potentiometer and a thermistor universal plug, for convenience, between can be connected with a long wire, Unplug the suspected thermistor, plug in the universal plug, power on the air conditioner, test the voltage of the two terminals of the potentiometer with a multimeter 5v, slowly turn the potentiometer handle, when the voltage is 2.5V, stop turning, then the resistance value of the potentiometer is the resistance value of the thermistor. For example, if the resistance value is 8k and the ambient temperature is about 30 ° C, the resistance value of the temperature sensor is 10k.

How to judge the quality of air conditioning temperature sensor

If the air conditioning temperature sensor is broken, the following phenomena will occur, which can be used to judge the quality of the air conditioning temperature sensor:

1. The resistance value of the indoor ring temperature sensor increases, causing the air conditioner to start frequently.

2. The resistance value of the indoor pipe temperature sensor becomes small, causing the whole machine protection shortly after starting.

3. The temperature sensing performance of indoor ring temperature and pipe temperature changes, causing the air conditioner to work improperly.

4. The indoor pipe temperature change value is 0Ω, resulting in no response to the remote startup of the whole machine.

Air conditioning temperature sensor is broken solution:

The temperature sensor barrier occupies a relatively large proportion in the air conditioning fault, to accurately judge the first thing to understand its function, the air conditioning control part is equipped with three temperature sensors:

1. Room temperature sensor: mainly detect the indoor temperature, when the indoor temperature reaches the set requirements, control the operation of the internal and external machine, the external machine stops when cooling, the internal machine continues to run, and the internal machine stops after blowing waste heat when heating.

2. Indoor pipe temperature sensor: mainly detects the coil temperature of the indoor evaporator, and plays the role of anti-cold air, anti-overheating protection and automatic temperature control during heating.

3. Outdoor defrosting temperature sensor: mainly detects the temperature of outdoor condenser coil. When the outdoor coil temperature is lower than -6 degrees Celsius for 2 consecutive minutes, the inner unit will turn into defrosting state.

The displayed temperature of the air conditioner is inconsistent with the actual perceived temperature Cause analysis:

1. The remote control is not set correctly;

2. The filter is not cleaned in time;

3. There are items in the air conditioner inlet and outlet affecting the heating effect, and the room has a heat source or many indoor personnel resulting in poor cooling effect;

4. The room insulation effect is poor;

5. The indoor power supply voltage is too low, resulting in low air conditioning efficiency;

6. The ambient temperature is too high or too low, resulting in poor effect.

During the maintenance of the air conditioner, the temperature sensor (thermistor) has a high proportion of faults. Once the fault occurs, such as open circuit, short circuit, or poor characteristic curve, the air conditioner displays an abnormal code and cannot work normally. Because the temperature sensor is not marked with parameters and resistance values, it is often difficult to determine in maintenance, that is, the same brand, different models, the resistance value is not necessarily the same.

Temperature sensor, that is, the resistance value decreases when the temperature rises; The resistance value increases when the temperature decreases. The negative sampling voltage of the CPU comparator is 1/2 of the CPU power supply voltage, which is 2.5V. While the peripheral circuit RTl and RT2 op amp comparator positive pull-up resistance, R1 and R2 are the lower bias resistance.