Ambient temperature is low Cooling Fan Manufacturer slow speed.

Thermostat "Cooling Fan Manufacturer" into true and false temperature thermostat two, the difference between the two: A. True temperature control circuit design and speed curve, its advantages and disadvantages: Advantages: One circuit design is relatively stable when adjusted by the thermistor resistance change caused by IC internal bandwidth control to control the speed of the speed, the fan speed changes. Second thermistor body does not heat, to ensure the nature and characteristics of the life cycle. Its three models can be applied to large current. "Cooling Fan Manufacturer" Disadvantages: One circuit design of high complexity costs. Second NA minicomputer species (internal PCB disposal located no less)
B. False temperature control circuit design and speed curve as shown below, its advantages and disadvantages: Advantages: One circuit design simple low cost. The second can be applied minicomputer species. Cons: One circuit is designed to the positive terminal of the power series a thermistor, a thermistor for limiting value change (down) to control the speed of the fan speed, the relative speed of change is also unstable. "Cooling Fan Manufacturer" Second thermistor series negative cut because the entire circuit, its easy to heat the body, the resistance changes very unstable. Third NA high current models.