To "220V Cooling Fan" sensor installation position selection should pay attention to the sensor in the proper position, try to make the sensor can be directly clamped surface to be cooled. In operation, a temperature-controlled fan will run at a faster pace if the thermistor feel higher temperatures; and at lower temperatures, it will operate at low speed; in these higher and lower middle, "220V Cooling Fan" will hardly speed due to temperature change. When the temperature changes slow the fan, the fan speed changes are slow, will not suddenly change the fan speed and noise. The reaction time depends mainly on the length of its heat-sensing sensor sensitivity. "220V Cooling Fan" monitoring and protection despite the frequency motor has a high reliability, but it is still mechanical devices, in the long-term use, the speed may drop even stopped, so it is best to fan operation status real-time monitoring, to facilitate the timely detection of problems.