Installation Requirements; Location; Bypass With Pressure Relief Valve; Electrical Connection - Grundfos NB Installation And Operating Instructions Manual

3. Installation requirements

3.1 Location

3.1.1 Horizontal or vertical installation
NB, NBG
Fig. 3 Installation of NB, NBG pumps
TP, TPD
Fig. 4 Installation of a TP and a TPD pump
with a motor size smaller than 11 kW
Fig. 5 Installation of a TP and a TPD pump
with a motor size of 11 kW and above
3.1.2 Pit installation
WARNING
Accumulation of explosive gases from
shaft seal leakage
Death or serious personal injury
- Provide adequate ventilation around the
pump if the pump is installed in a pit. A
minimum air exchange of 1.5 times per
hour is required.

3.2 Bypass with pressure relief valve

CAUTION
Overheating
Minor or moderate personal injury
- The pump must not run against a closed
outlet valve or a closed shut-off element
as this may cause overheating. Install a
bypass with a pressure relief valve.
Observe the minimum flow rate. See section
1.2 Related installation and operating

4. Electrical connection

4.1 Earthing the pump housing

DANGER
Electric shock
Death or serious personal injury
- The pump housing must be earthed.
DANGER
Ignition of explosive environment
Death or serious personal injury
- The pump housing must be earthed.
Remove coating from the earthing point to
ensure proper grounding connection.
Fig. 6 Earthing point of the pump housing
Torque: 80 ± 16 Nm.
instructions.
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