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

3. Installation requirements

3.1 Location

3.1.1 Installation position
Fig. 3 Horizontal installation of the products
3.1.2 Pit installation
WARNING
Accumulation of explosive gases from
shaft seal leakage
Death or serious personal injury
- Provide adequate ventilation 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
8

4. Electrical connection

4.1 Earthing the pump housing

Fig. 4
Torque: 80 ± 16 Nm.
instructions.
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.
Earthing point of the pump housing