Grundfos SE1 50 Notice D'installation Et De Fonctionnement page 16

4. Adjust the length of the power cable by coiling
it up on a relief fitting to ensure that the cable
is not damaged during operation. Fasten the
relief fitting to a suitable hook at the top of the
tank. Make sure that the cable is not sharply
bent or pinched.
5. Connect the power cable.
The free end of the cable must not be
submerged as water may penetrate
into the motor.
Free-standing, submerged installation on a ring
stand
5.1.3 Dry installation
In dry installations, the pump must be installed
permanently outside the tank.
The motor is enclosed and watertight, so it cannot
be damaged in case the installation site is
flooded.
Precautions
• As the pump is installed outside the tank,
make sure that the liquid level is high enough
to ensure sufficient NPSH.
• Size the inlet line according to the length and
the desired pump performance. A possible
difference in level between the tank and the
pump inlet must also be taken into account.
• Support the pipes to avoid strain or other
mechanical influences being transmitted to the
pump. Install expansion joints and pipe
hangers.
16
Dry, horizontal installation with brackets
Pos. Description
1 Expansion joint
2 Non-return valve
3 Isolating valve
4 Pipe hanger
• If a reducer is fitted between the inlet line and
the pump, it must be eccentric. Fit the reducer
with the straight edge facing upwards to avoid
air pockets in the inlet line. Air in the inlet line
may cause cavitation.
• Install the pump on a separate foundation.
The weight of the foundation must be
approximately 1.5 times the weight of the
pump. To prevent vibrations from being
transmitted to the building and pipes, place
the pump on vibration absorbing material.
Dry, vertical installation on a base stand