Mechanical Installation; Preparations Before Installation; Pump Location; Connection - Grundfos NB Original Installation And Operating Instructions

7. Mechanical installation

7.1 Preparations before installation

It is very important to handle the equipment
Caution
correctly before installation!
The contractor must inspect the equipment on delivery and make
sure that it is stored in such a way that corrosion and damage are
avoided.
If more than 6 months will pass before the equipment is put into
operation, it should be considered whether a suitable anti-
corrosive agent should be applied to the internal pump parts.
Ensure
that the agent used does not affect the rubber parts with which it
comes into contact.
that the agent can easily be removed.
To prevent water, dust, etc. from entering the pump, all openings
must be kept covered until the pipes are fitted. The cost of
dismantling the pump during start-up to remove a foreign object
can be very high.
Mechanical shaft seals are precision components. If the
mechanical shaft seal of a recently installed pump fails, this will
normally happen within the first few hours of operation. The main
cause of such failures is improper installation of the shaft seals
and/or mishandling of the pump during installation.
During transport, the pump must be fastened securely to prevent
excessive vibration and/or damage to the shaft and seal caused
by dropping or striking. The pump must not be lifted by means of
the shaft.

7.2 Pump location

The pump should be sited in a well ventilated, but frost-free
location.
Warning
When pumping hot liquids, care should be
taken to ensure that persons cannot
accidentally come into contact with hot
surfaces.
For inspection and repair, suitable clearances for pump or motor
removal must be allowed.
Vertical installation
• Pumps fitted with motors up to and including 4 kW require a
300 mm clearance above the motor.
• Pumps fitted with motors of 5.5 kW and up require at least a
1 metre clearance above the motor to allow the use of lifting
equipment.
0.25 - 4 kW
300 mm
Fig. 8 Clearance above the motor.
Horizontal installation
• Pumps fitted with motors up to and including 4 kW require a
300 mm clearance behind the motor.
• Pumps fitted with motors of 5.5 kW and up require a 300 mm
clearance behind the motor and at least a 1 metre clearance
above the motor to allow the use of lifting equipment.
• NB pumps with base frame must have the same clearance as
pumps with motors from 5.5 to 200 kW.
5.5 - 37 kW
1 m
0.25 - 4 kW
5.5 - 200 kW
1 m
Fig. 9 Clearance behind the motor

7.3 Connection

Arrows on the pump housing show the direction of flow of liquid
through the pump.
The pumps can be installed with the motor/pump shaft in all
positions between vertical and horizontal, but the motor must
never fall below the horizontal plane.
Horizontal motors with feet must always be supported.
0.25 - 37 kW 0.25 - 200 kW
Fig. 10 Installation positions
It is advisable to fit isolating valves on either side of the pump. It
is thus not necessary to drain the system if the pump needs to be
cleaned or repaired.
300 mm
300 mm
15