Replacement Of Differential-Pressure Sensor - Grundfos UPE 2000 FZ Series Montage- Und Betriebsanleitung

5. Replacement of differential-pressure sensor

Dismantling
Warning
Please note that the pump may be hot for a while after being
switched off and that hot liquid may escape from the pump
during dismantling.
Warning
Never make any connections in the pump control box unless
the power supply has been switched off for at least 5 minutes.
Make sure that voltage supplies from other external systems
have been switched off as well.
1. Switch off the power supply to the pump, and make sure that it cannot be
accidentally switched on again during replacement.
2. Close the isolating valves on either side of the pump or empty pipe
system for water.
3. Remove the four screws securing the control box cover. Remove the
cover. See fig. 2.
4. Disconnect the plug from the terminal block (D). See fig. 13. Refer to
section Wiring diagram in the general installation and operating
instructions.
5. Unscrew the cable entry. See fig. 14.
6. Remove the two screws securing the metal block with the differential
pressure sensor to the pump housing. See fig. 15.
7. Remove the metal block with the sensor from the pump. See fig. 15.
8. Dispose of the faulty differential pressure sensor according to
section 10. Disposal.
Assembly
1. Place the O-ring from the sensor kit on the pump housing. See fig. 17.
1. Fit the metal block holding the sensor on the pump housing without
damaging the O-ring. See fig. 16.
2. Tighten the two screws. See fig. 15.
3. Enter the lead into the control box bottom.
4. Fit the plug into the terminal block (D). See fig. 13.
5. Tighten the cable entry. See fig. 14.
6. Mount the cover, fit and tighten the four screws. See fig. 2.
7. Open the isolating valves on either side of the pump.
The pump is now ready for operation. See section 9. Start-up.
10