Grundfos SE1 50 Instrucciones De Instalación Y Funcionamiento página 17

Standard version
Thermal switches
* Pumps from 4 kW and up sold in Australia/New Zealand are fitted with a PTC thermistor.
Fig. 10 Wiring diagram, 10-core cable, star-connected (Y)
Standard version
Thermal switches
* Pumps from 4 kW and up sold in Australia/New Zealand are fitted with a PTC thermistor.
Fig. 11 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.
Thermal switch
PTC thermistor
Yellow/green
Sensor version
Thermal switch, Pt1000, moisture
switch and water-in-oil sensor
Yellow/green
Sensor version
Thermal switch, Pt1000, moisture
switch and water-in-oil sensor
Without cable
< 50 mΩ
> 100 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
With 10 m cable
< 320 mΩ
> 370 mΩ
With 15 m cable
< 390 mΩ
> 440 mΩ
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