Locking Pin; Installation Examples - Grundfos SCALA2 Instructions Manual

5.5 Locking pin

The pump may produce a clicking noise if there is positive pressure
at the inlet of the pump. In this case, you can mount a locking pin to
avoid this noise. When a locking pin is mounted, the self-priming
function is not applicable.
If the pump has a negative pressure at the inlet, removing the
locking pin is necessary to enable the self-priming function.
5.5.1 Mounting the locking pin
To mount the locking pin, proceed as follows:
1. Turn off the pump.
2. Close the inlet and outlet valves to the pump to avoid backflow.
3. Loosen and remove the drain plug.
4. Insert the locking pin.
5. Mount and tighten the drain plug.
6. Open the inlet and outlet valves and turn on the pump.
7. If necessary, prime the pump.
5.5.2 Removing the locking pin
To remove the locking pin, proceed as follows:
1. Turn off the pump.
2. Close the inlet and outlet valves to the pump to avoid backflow.
3. Loosen and remove the drain plug.
4. Remove the locking pin with a small plier.
5. Mount and tighten the drain plug.
6. Open the inlet and outlet valves and turn on the pump.
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5.6 Installation examples

Fittings, hoses and valves are not supplied with the pump.
We recommend to follow the installation examples in sections
Mains water pressure boosting to Suction from freshwater tank.
All installations must be carried out in accordance with lo-
cal regulations.
Related information
5.6.1 Mains water pressure boosting
5.6.2 Suction from a well
5.6.3 Suction from freshwater tank
5.6.4 Inlet pipe length