Mechanical Installation - Grundfos MAGNA1 Installation And Operating Instructions Manual

3.3 Mechanical installation

The pump range includes both flanged and threaded versions.
These installation and operating instructions apply to both
versions, but give a general description of flanged versions. If the
versions differ, the threaded version will be described separately.
Install the pump so that it is not stressed by the pipes. For
maximum permissible forces and moments from pipe connections
acting on the pump flanges or threaded connections, see page
26.
You can suspend the pump directly in the pipes, provided that the
pipes support the pump.
Twin-head pumps are prepared for installation on a mounting
bracket or base plate. Pump housing with M12 thread.
To ensure adequate cooling of motor and electronics, observe the
following requirements:
• Position the pump in such a way that sufficient cooling is
ensured.
• The ambient temperature must not exceed 40 °C.
Step Action
Arrows on the pump housing
indicate the liquid flow direction
through the pump. The liquid flow
1
direction can be horizontal or
vertical, depending on the
control-box position.
Close the isolating valves and
make sure that the system is not
2
pressurised during installation of
the pump.
Mount the pump with gaskets in
3
the pipes.
Flanged version:
Fit the bolts, washers and nuts.
Use the correct size of bolts
according to system pressure.
4 For further information about
torques, see page 26.
Threaded version:
Tighten the union nuts.
3.3.1 Pump positions
Always install the pump with horizontal motor shaft.
• Pump installed correctly in a vertical pipe. See fig. 8, pos. A.
• Pump installed correctly in a horizontal pipe.
See fig. 8, pos. B.
• Do not install the pump with vertical motor shaft.
See fig. 8, pos. C and D.
A
C
Illustration
Fig. 8
3.3.2 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. 9.
Fig. 9
Fig. 10 Automatic vent
B
D
Pump installed with horizontal motor shaft
Pump with control box in horizontal position
Fit twin-head pumps installed in horizontal pipes
with an automatic air vent, Rp 1/4, in the upper part
of the pump housing. See fig. 10.
5