Temperature regulator RT-833

Operation
Once the temperature rises above the set point Tmin, the fan starts, and its rotational speed will be proportional to the measured temperature and regulator settings:
- for temperature Tmin the rotational speed will be equal to the set minimum speed.
- for temperature Tmin + Δ the rotational speed is 100%.
- for temperature in range Tmin <> Tmin + Δ rotational speed is mapped proportionally in the range from the set minimum speed up to 100%.

The regulator has a relay output that signals too high temperature or damage (no power) to the regulator.
During normal operation, the contact 7-9 is closed. If the measured temperature is higher than the maximum value (Tmin+Δ) for a period of three minutes, the contact is switched off. If the regulator is damaged or the power is off, contacts 7-9 can be used for error signaling.

To avoid the problem with the motor stalling at low speeds, the regulator can start from the maximum speed - the fan starts from the maximum speed and then slows down to a suitable value.
          

Dedicated temperature probe [F&F]