Alternative Connection Positions; Terminal Box Positions; Avoiding Condensation In The Motor - Grundfos CM Serie Instrucciones De Instalación Y Funcionamiento

A
Fig. 4 Recommended pipework for a
self-priming pump
Suction lift
(H )
2
[m]
4
5
6
7
8

6.3 Alternative connection positions

The pump is available with various connection
positions on special request. See fig. 5.
Fig. 5 Alternative connection positions
Self-priming pumps:
These pumps are only available with the
Note
discharge port pointing upwards, i.e. in the
same direction as the filling hole.
H
1
H 1
H
2
H
3
Minimum height
(H )
1
[m]
0.2
0.35
0.5
0.6
0.7

6.4 Terminal box positions

The pump is available with various terminal box
positions on special request. See fig. 6.
Fig. 6 Terminal box positions

6.5 Avoiding condensation in the motor

If the liquid temperature falls below the ambient
temperature, condensation may form in the motor
during standstill. Condensation can occur in moist
surroundings or areas with high humidity.
In such cases, use a motor suitable for condensing
environments such as an IPX5 motor available from
Grundfos.
Alternatively, open the bottom drain hole in the motor
flange by removing the plug. See fig. 7. This reduces
the motor enclosure class to IPX5.
1
Fig. 7 Motor drain plug
Pos. Description
1 Motor drain plug
The open drain hole helps prevent condensation in
the motor as it makes the motor self-venting and
allows water and humid air to escape.
When you install the pump outdoors, provide the
motor with a cover to avoid condensation. See fig. 8.
Fig. 8 Examples of covers (not supplied by
Grundfos)
9