Grundfos NB Series, Installation And Operating Instructions Manual

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6. Installation
6.1 Preparations before installation
Note: It is very important to handle the equipment 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-corro-
sive 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 dis-
mantling the pump during start-up to remove a foreign object can
be very high.
Mechanical shaft seals are precision components. If the mechan-
ical 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 or the pipe
for barrier fluid and/or mishandling of the pump during installa-
tion.
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.
6.2 Pump location
The pump should be sited in a well ventilated, but frost-free loca-
tion.
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. See fig. 7.
• 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. See fig. 7.
Fig. 7 Clearance above the motor.
Horizontal installation:
• Pumps fitted with motors up to and including 4 kW require a
300 mm clearance behind the motor, fig. 8.
• 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. See
fig. 8.
Fig. 8 Clearance behind the motor
The lifting eye of pump motors of 4 kW and up may only be used
for lifting the pump head (motor, motor stool and impeller). The
lifting eye
must not be used for lifting the entire pump.
6.3 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 posi-
tions between vertical and horizontal, but the motor must never
fall below the horizontal plane. See fig. 9.
Horizontal motors with feet must always be supported.
Fig. 9 Installation
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.
When pumping hot liquids, care should be taken to
ensure that persons cannot accidentally come into
contact with hot surfaces.
T
M
03
41
28
17
06
300 mm 1 m
0.25 - 4 kW 5.5 - 30 kW
T
M
03
41
27
17
06
T
M
03
41
26
17
06
300 mm
0.25 - 4 kW
300 mm
5.5 - 200 kW
1 m
0.25 - 30 kW 0.25 - 200 kW