Many households have wall-mounted air conditioners, offering numerous benefits but also prone to issues like temperature sensor malfunctions. This article provides a detailed analysis of wall-mounted air conditioner temperature sensor malfunctions and the principles behind these sensors.
The wall-mounted temperature sensor is an ideal solution for various applications, including libraries, archives, production workshops, industrial automation, HVAC, pharmaceuticals, telecommunications, environmental monitoring, clean rooms, smart buildings, and telecommunication base stations. This sensor utilizes a high-quality integrated digital temperature and humidity sensor as the probe, ensuring excellent long-term stability, low latency, and strong resistance to chemical pollution. It also boasts high repeatability, easy maintenance, quick calibration-free replacement, and cost-effectiveness.
Principles of Wall-Mounted Air Conditioner Temperature Sensor:
The air conditioner temperature sensor is a negative temperature coefficient thermistor, abbreviated as NTC. Its resistance decreases with increasing temperature and vice versa.
At a resistance value of 25°C, considered the standard, NTC commonly experiences faults such as increased resistance, potential open or short circuits, poor contact between plugs and sockets, or leakage, gradually causing abnormal voltage at the air conditioner CPU detection terminals.
Common NTCs in air conditioners include indoor ambient temperature NTC, indoor coil NTC, and outdoor coil NTC. High-end air conditioners may have additional sensors like outdoor ambient temperature NTC and compressor suction/discharge NTC.
NTCs, when integrated into the circuit, exhibit resistance changes with temperature variations, influencing the NTC resistance value and subsequently the CPU terminal voltage. The CPU uses this voltage change to determine the air conditioner's operational status.
Analysis of Wall-Mounted Air Conditioner Temperature Sensor Malfunctions:
Symptoms: Poor heating performance of the air conditioner, consistently low fan speed.
Causes: Upon on-site inspection, the heating function is active, but the fan speed remains low, and the air outlet is hot. Switching to cooling or fan-only mode allows adjustment of fan speed, indicating the fan motor is normal. Suspected changes in the characteristics of the indoor coil temperature sensor.
Solution: After replacing the indoor coil temperature sensor, the unit operates normally.
Additional Insights:
During heating, the indoor fan operates at low speed until the coil temperature reaches 25°C. Above 38°C, the fan operates at the set speed. The malfunction was initially observed as low fan speed and high outlet temperature. After confirming normal fan speed, the analysis focused on potential incorrect temperature readings from the sensor, leading to the replacement of the sensor.
Conclusion:
Temperature sensor malfunctions contribute significantly to air conditioner faults. Understanding their functionality is crucial for accurate diagnostics. Air conditioning control systems typically include three temperature sensors: room temperature, indoor coil, and outdoor defrosting. Each plays a distinct role in ensuring optimal operation and protection against freezing conditions.
In summary, this article provided an in-depth exploration of wall-mounted air conditioner temperature sensor malfunctions, offering insights into their principles and solutions for better comprehension and troubleshooting.
The wall-mounted temperature sensor is an ideal solution for various applications, including libraries, archives, production workshops, industrial automation, HVAC, pharmaceuticals, telecommunications, environmental monitoring, clean rooms, smart buildings, and telecommunication base stations. This sensor utilizes a high-quality integrated digital temperature and humidity sensor as the probe, ensuring excellent long-term stability, low latency, and strong resistance to chemical pollution. It also boasts high repeatability, easy maintenance, quick calibration-free replacement, and cost-effectiveness.
Principles of Wall-Mounted Air Conditioner Temperature Sensor:
The air conditioner temperature sensor is a negative temperature coefficient thermistor, abbreviated as NTC. Its resistance decreases with increasing temperature and vice versa.
At a resistance value of 25°C, considered the standard, NTC commonly experiences faults such as increased resistance, potential open or short circuits, poor contact between plugs and sockets, or leakage, gradually causing abnormal voltage at the air conditioner CPU detection terminals.
Common NTCs in air conditioners include indoor ambient temperature NTC, indoor coil NTC, and outdoor coil NTC. High-end air conditioners may have additional sensors like outdoor ambient temperature NTC and compressor suction/discharge NTC.
NTCs, when integrated into the circuit, exhibit resistance changes with temperature variations, influencing the NTC resistance value and subsequently the CPU terminal voltage. The CPU uses this voltage change to determine the air conditioner's operational status.
Analysis of Wall-Mounted Air Conditioner Temperature Sensor Malfunctions:
Symptoms: Poor heating performance of the air conditioner, consistently low fan speed.
Causes: Upon on-site inspection, the heating function is active, but the fan speed remains low, and the air outlet is hot. Switching to cooling or fan-only mode allows adjustment of fan speed, indicating the fan motor is normal. Suspected changes in the characteristics of the indoor coil temperature sensor.
Solution: After replacing the indoor coil temperature sensor, the unit operates normally.
Additional Insights:
During heating, the indoor fan operates at low speed until the coil temperature reaches 25°C. Above 38°C, the fan operates at the set speed. The malfunction was initially observed as low fan speed and high outlet temperature. After confirming normal fan speed, the analysis focused on potential incorrect temperature readings from the sensor, leading to the replacement of the sensor.
Conclusion:
Temperature sensor malfunctions contribute significantly to air conditioner faults. Understanding their functionality is crucial for accurate diagnostics. Air conditioning control systems typically include three temperature sensors: room temperature, indoor coil, and outdoor defrosting. Each plays a distinct role in ensuring optimal operation and protection against freezing conditions.
In summary, this article provided an in-depth exploration of wall-mounted air conditioner temperature sensor malfunctions, offering insights into their principles and solutions for better comprehension and troubleshooting.
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