Installation Requirements; Location; Minimum Clearance; Installation Positions - Grundfos NBS Serie Notice D'installation Et De Fonctionnement

4. Installation requirements

4.1 Location

CAUTION
Hot or cold surface
Minor or moderate personal injury
‐
When pumping hot or cold liquids, make sure that no
one can accidentally come into contact with hot or cold
surfaces.
The pump must be sited in a well-ventilated, but frost-free location.

4.1.1 Minimum clearance

For inspection and repair, allow suitable clearance for pump and
motor removal.
• Pumps fitted with motors up to and including 4 kW (5 hp) require
a 12 inches (0.3 m) clearance behind the motor.
A is minimum 12 inches (0.3 m).
• Pumps fitted with motors of 7.5 hp (5.5 kW) and up require a 12
inches (0.3 m) clearance behind the motor and at least a
clearance of 40 inches (1 m) above the motor to allow for the
use of lifting equipment.
A
A is minimum 40 inches (1 m), B is minimum 12 inches (0.3 m).

4.2 Installation positions

Arrows on the pump housing show the direction of the flow of liquid
through the pump.
Only horizontal installation is allowed for NBS pumps. Contact
Grundfos for information on extra installation requirements if special
installation positions are needed.
The motor must never be positioned below the horizontal plane.
Horizontal motors with feet must always be supported.

5. Mechanical installation

5.1 Foundation

• We recommend that you install the pump on a flat concrete
foundation that is heavy enough to provide permanent support
for the entire pump.
• The foundation must be adequate for absorbing any vibration,
normal strain or shock.
• The foundation may float on springs or be a raised part of the
floor.
• Optimally, the weight of the concrete foundation must be at least
1.5 times the weight of the pump.
• The foundation must have a completely even surface.
• The foundation length and width must always be 8 inches (200
mm) larger than the length and width of the pump. See the
figure below.
A
B
• The minimum height of the foundation, indicated by hf, can be
calculated with the following formula:
h f =
h
f
L
f
B
f
m
pump
δ
concrete
The density of concrete, indicated by δ, is usually taken as 0.08
lb/in
• In installations where noiseless operation is particularly
important, we recommend a foundation with a mass up to 5
times that of the pump.
L
f
L
f
m pump × 1.5
L f × B f × δ concrete
Height of the foundation [in] ([m])
Length of the foundation [in] ([m])
Width of the foundation [in] ([m])
Mass of the pump [lbs] ([kg])
Density of the concrete [lb/in
3 3
(2,200 kg/m )
After installation is finished, tighten the screws connecting
the flange, feet and the anchor bolts according to the
tightening torques. You must apply an anti-loose method,
such as mounting lock washers.
3 3
] ([kg/m ])
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