交流溫度傳感器的選型及分類

Control indoor ambient temperature;
Condenser tube temperature;
The temperature sensor for air conditioner is negative temperature coefficient thermistor, 簡稱NTC. Its resistance decreases with increasing temperature and increases with decreasing temperature. The resistance at 25℃ is nominal value. Common faults of NTC include resistance increase, 開路, resistance change due to moisture and mildew, 短路, poor contact between plug and socket or leakage, ETC. Abnormal voltage at the detection terminal of air conditioner CPU causes air conditioner failure.

Function of Air Conditioner Temperature Sensor

5×25 Stainless Steel Air Conditioner NTC Temperature Sensor 10K

交流溫度傳感器測量房間溫度與室外溫度

空調常用NTC熱敏電阻
共有三種類型: 室內環境溫度NTC, 室內線圈NTC, 和室外線圈NTC. 高端空調也採用外部環境溫度NTC, 壓縮機吸氣、排氣NTC, ETC.

NTC has two main uses in the circuit as shown in Figure 1: Temperature changes cause NTC resistance to change, and the voltage at the CPU terminal also changes accordingly. The CPU determines the working state of the air conditioner based on the change in voltage.

Function of air conditioner temperature sensor
我. 室內環境溫度傳感器:
(1) Used to automatically control indoor temperature during heating or cooling.
(2) Heating is used to control the operation of the auxiliary electric heater.

2. 室內盤管溫度傳感器:
(1) Used to prevent cold wind control during winter heating.
(2) Used to prevent freezing protection during summer cooling.
(3) Used to control the wind speed of the indoor unit.
(4) Cooperate with the chip to realize fault self-protection.
(5) Control the frost of the outdoor unit during heating.

3. 室外環境溫度傳感器:
(1) The system automatically protects when the outdoor temperature is too high or too low.
(2) Used for outdoor unit wind speed during cooling or heating.

4. 室外盤管溫度傳感器:
(1) Used for outdoor unit dehumidification during heating.
(2) Used for overheating protection or anti-freezing protection during cooling or heating.

5. Outdoor unit compressor exhaust temperature sensor:
(1) The system automatically protects when the compressor exhaust temperature is too high.
(2) Used to control the opening degree of the electronic expansion valve and the increase or decrease of the compressor frequency in variable frequency air conditioners. Function of indoor ambient temperature NTC:
Indoor ambient temperature NTC detects the temperature of the indoor environment and automatically starts, stops or changes frequency according to the set working state. Fixed frequency air conditioner makes the indoor temperature difference range to the set value + 1℃, 那是, if the cooling is set to 24℃, the compressor will stop when the temperature drops to 23℃, and the compressor will work when the temperature rises to 25℃. If the heating is set to 24℃, the compressor will stop when the temperature rises to 25℃, and the compressor will work when the temperature falls back to 23℃.
It is worth noting that the temperature setting range is generally between 15℃-30℃, so cooling does not work at an ambient temperature below 15℃, and heating does not work at an ambient temperature above 30℃.