Mechanical Installation; Installation Of Pump; Pipework; Pipe Connection - Grundfos CM Instrucciones De Instalación Y Funcionamiento

7. Mechanical installation

Before installing the pump, confirm that the pump type and parts
are as ordered by checking the nameplate.

7.1 Installation of pump

The pump must be installed on a plane surface and secured so
that it cannot be displaced during start-up and operation.
If the liquid temperature becomes lower than the ambient
temperature, condensation may form in the motor during
inactivity. In such cases, the plug must be removed from the drain
hole in the motor, and the drain hole must point downwards.
See fig. 3.
Drain hole
Fig. 3 Drain hole position
The pump must be installed so that air locks are avoided in the
pump housing and pipework. Fig. 4 shows the permissible pump
positions.
Fig. 4 Pump positions
The pump should be installed with easy access for inspection,
maintenance and service.
The pump should be installed in a well-ventilated location.
Min. 2"
Fig. 5 Allow minimum 2" distance from motor fan to a surface

7.2 Pipework

Install isolating valves at the suction and discharge sides of the
pump for ease of maintenance and 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.
The pump must not be stressed by the pipework. The pipework
must be correctly sized taking due account of the pump inlet
pressure.
If the pump is installed at the lowest point of the system,
impurities and sludge may accumulate in the pump.
Install the pipes so that air locks are avoided, especially on the
suction side of the pump. See fig. 6.
Fig. 6

7.2.1 Pipe connection

Up
Fig. 7
Torques
Floor
Suction and discharge ports

7.3 Alternative connection positions

The pump is available with various connection positions on
special request. See fig. 8.
Fig. 8
Pipework
Avoid damaging the pump when connecting the
suction and discharge pipes.
The torques in the table below must not be
exceeded.
Discharge port
Suction and discharge ports
Torque [ft-lbs (Nm)]
1" 37 - 44 (50 - 60)
1 1/4" 37 - 44 (50 - 60)
1 1/2" 37 - 44 (50 - 60)
2" 37 - 44 (50 - 60)
Alternative connection positions
Suction
port
7