The step transformer controller have the special characteristic that the ventilators make no noise “hum” in the lower rotation. The step transformer control the fan speed from self 6-step up/down according the temperature. Temperature as Hysteresis (sensitivity) can be set on two knob’s. A internal hardware setting (Jumper) you can choose if the minimum speed is 0 “zero” off position or if the fan should keep working in the lowest step to prevent odors escaping.
TEMPERATURE STEP TRANSFORMER CONTROLLER 2 FAN (2.5 AMP)
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