User Guide

9
English (US)
4.4 Mechanical installation
The pump range includes flanged versions.
Install the pump so that it is not stressed by the pipes. For
maximum permissible forces and moments for pipe connections
acting on the pump flanges, see Appendix.
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. The pump housing has an M12 thread.
To ensure adequate cooling of the motor and electronics, observe
the following requirements:
• Make sure that the control box is in horizontal position with the
Grundfos logo in vertical position. See 4.6 Control box
positions.
• The ambient temperature must not exceed 104 °F (40 °C).
As an alternative to insulating shells, you can insulate the pump
housing and pipes as illustrated in fig. 5.
Fig. 5 Insulation of the pump housing and pipe
4.5 Positioning the pump
Always install the pump with a horizontal motor shaft.
• Pump installed correctly in a vertical pipe. See fig. 6 (A).
• Pump installed correctly in a horizontal pipe. See fig. 6 (B).
• Do not install the pump with a vertical motor shaft. See fig. 6
(C and D).
Fig. 6 Pump installed with a horizontal motor shaft
Step Action Illustration
1
Arrows on the pump
housing indicate the
flow direction through
the pump. The flow
direction can be
horizontal or vertical,
depending on the
control box position.
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2
Close the isolating
valves and make sure
that the system is not
pressurized during the
installation of the pump.
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3
Mount the pump with
gaskets in the pipes.
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4
Flanged version:
Fit bolts and nuts. Use
the right size of bolts
according to system
pressure.
For further information
about torques, see
Appendix.
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5 Fit the insulating shells.
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Do not insulate the control box or cover the operating
panel.
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Step Action Illustration
BA
DC