Mechanical Installation; Installation Of Pump; Pipework - Grundfos CM 1 Manual De Instrucciones

6. Mechanical installation

Before installing the pump, check that the pump type
and parts are as ordered.
Warning
When pumping hot or cold liquids,
make sure that persons cannot
accidentally come into contact with hot
or cold surfaces.

6.1 Installation of pump

Install the pump on a plane surface and fix it so that
it cannot be displaced during start-up and operation.
Install the pump so that air locks are avoided in the
pump housing and pipework.
Figure 1 and the table below show the permissible
pump positions.
Fig. 1 Pump positions
Pump Non-self-priming
position pumps
1
2
3
4
5
6
● Mounting in this position is allowed.
Install the pump so that inspection, maintenance and
service can easily be performed.
Install the pump in a well-ventilated location.
10
Up
Floor
Self-priming
pumps
- -
● -
● -
● ●
- -
● ●

6.2 Pipework

We recommend to fit isolating valves on either side
of the pump. It is thus not necessary to drain the
system if the pump needs service.
If the pump is installed above the liquid level, a
non-return valve must be fitted in the suction pipe
below the liquid level. See fig. 4.
Self-priming pumps:
We recommend an opening pressure of
the non-return valve which is lower
Note
than 0.05 bar. Otherwise the additional
resistance will reduce the suction
capability of the pump.
If the pump is to be used for pumping rainwater or
well water, we recommend to fit a filter to the inlet of
the suction pipe.
The pump must not be stressed by the pipework.
Install the pipes according to the design
requirements given in EN ISO 13480-3:2012.
Tolerances must comply with EN ISO 13920:1996,
class C.
The pipework must be correctly sized taking due
account of the pump inlet pressure.
Install the pipes so that air locks are avoided,
especially on the suction side of the pump.
See fig. 2.
Fig. 2 Pipework