Positioning The Pump; Control Box Positions - Grundfos MAGNA3 25-80 Installation And Operating Instructions Manual

Step Action
Flanged version:
Fit bolts and nuts. Use the
right size of bolts according
to system pressure.
4 For further information about
torques, see page 64.
Threaded version:
Tighten the union nuts.

3.4 Positioning the pump

Always install the pump with horizontal motor shaft.
• Pump installed correctly in a vertical pipe. See fig.
• Pump installed correctly in a horizontal pipe. See fig.
• Do not install the pump with vertical motor shaft. See fig.
and D).
A
C
Fig. 4 Pump installed with horizontal motor shaft
6
Illustration
4 (A).
4 (B).
4 (C
B
D

3.5 Control box positions

To ensure adequate cooling, make sure that the control box is in
horizontal position with the Grundfos logo in vertical position. See
fig. 5.
Make sure that the isolating valves are closed
before rotating the control box.
Fig. 5 Pump with control box in horizontal position
Twin-head pumps installed in horizontal pipes can
be fitted with an automatic vent, Rp 1/4, in the
upper part of the pump housing if no venting valve
is installed in the system. See fig. 6.
Fig. 6 Automatic vent