Non-Return Valve - Grundfos Multilift M Serie Instrucciones De Instalación Y Funcionamiento

5.1.4 Motor cable
The motor cable is fitted to the motor via a cable entry.
The enclosure class is IP68. The length of the cable is either 4 or
10 m.
Nameplate, motor
96075378 - A
Prod.- No.
19
~
Motor 3
20
Hz
U
50 400
21
P
I
2.8 kW 5.3
1
1/1
23
$
P
2.2 kW COS 0.77
2
22
IP68
24
25
Made in Germany
26
27
Fig. 3 Nameplate, motor
Pos. Description
19 Product number and model
20 Number of phases
21 Frequency
22 Input power
23 Shaft power
24 Power factor
25 Enclosure class
26 Production country
27 CE mark
28 Production week and year
29 Operating mode
30 Rated speed
31 Weight
32 Insulation class
33 Rated voltage
34 Rated current

5.1.5 Non-return valve

The DN 80 non-return valve includes a drain screw to lift up the
internal valve flap in order to drain the discharge pipe in case of
maintenance or service. The valve is designed and tested
according to EN 12050-4. See fig. 4.
Loosen the lock nut a little before turning the
Note
drain screw.
Drain screw
Fig. 4 Non-return valve
96075389
P. c. 0149 001
28
S3-40%-1min
29
V
-1
n 1405 min
30
Weight
A 24 kg
31
Insul.class F
32
33
34
5.1.6 Level sensor
The piezoresistive pressure sensor placed in the controller is
connected via a hose to a pressure tube in the tank. The screw
cap where the hose is connected includes a condensate trap and
a connection for a DN 100 tube. This tube, the pressure tube,
extends down into the tank. The rising liquid level compresses the
air inside the pressure tube and hose, and the piezoresistive
sensor transforms the changing pressure into an analogue signal.
The control box uses the analogue signal to start and stop the
pump and to indicate high water-level alarm. The pressure tube is
fixed underneath the screw cap and can be taken out for
maintenance, service and for cleaning the inside of the tube.
An O-ring ensures tightness.
The hose is supplied in lengths of 4 or 10 m. The hose must be
connected to the controller.
Fig. 5 Screw cap with hose, DN 100 tube and condensate
trap
13