Grundfos SL1 Serie Montage- Und Betriebsanleitung Seite 14

Standard version
Thermal switch and
moisture switch*
* Pumps from 4 kW and up sold in Australia/New Zealand are fitted with a PTC thermistor.
Fig. 8 Wiring diagram, 10-core cable, star-connected (Y)
Standard version
Thermal switch and
moisture switch*
* Pumps from 4 kW and up sold in Australia/New Zealand are fitted with a PTC thermistor.
Fig. 9 Wiring diagram, 10-core cable, delta-connected (D)
To find out whether the pump is fitted with a thermal switch or a
PTC thermistor, measure the motor winding resistance. See table
below.
Without cable
Thermal switch < 50 mΩ
PTC thermistor > 100 mΩ
14
Yellow/green
Sensor version
Thermal switch, Pt1000 resistor,
moisture switch and water-in-oil sensor
Yellow/green
Sensor version
Thermal switch, Pt1000 resistor,
moisture switch and water-in-oil sensor
With 10 m With 15 m
cable cable
< 320 mΩ < 390 mΩ
> 370 mΩ > 440 mΩ
Sensor version
Thermal switch, PTC thermistor*,
moisture switch and water-in-oil sensor
Sensor version
Thermal switch, PTC thermistor*,
moisture switch and water-in-oil sensor