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]
| designation | RT |
| temperature sensor | KTY 81-210 |
| dimensions | Ø5; h=20mm |
| isolation of sensor | heat shrink |
| wire | OMY 2×0,34mm²; l=2,5m |
| designation | RT823 |
| temperature sensor | KTY 81-210 |
| dimensions | Ø8; h=40mm |
| isolation of sensor | steel sleeve |
| wire | heat-resist SIHF 2×0,5mm²; l=2,5m |
