Grundfos SCALA Instructions Manual page 4

3.3.3 Connecting the piping system
Make sure that the pump is not stressed by the
piping system.
Always loosen and tighten the union nuts on the inlet
and outlet ports by hand. Damage to the inlet and
outlet parts increases the risk of leakage.
1. Turn the union nuts by hand to loosen the inlet and outlet
ports. See fig. 3.
2. Seal the pipe fittings with thread sealing tape.
3. Carefully screw the inlet and outlet connections to the pipe
fittings using a pipe wrench or similar tool. Keep the union nut
on the pipe fitting if you have removed it from the pump.
The pump is equipped with flexible connections, ± 5 °, to
facilitate the connection of inlet and outlet pipes.
4. Fasten the connections to the inlet and outlet. Hold the
connection with one hand and tighten the union nut with the
other hand.
1
2
3
Fig. 3 How to fit the connections
Pos. Description
1 Inlet and outlet port
2 Union nut
3 Pipe fitting
3.3.4 How to reduce noise in the installation
We recommend to use flexible hoses and mount the
pump on a vibration-damping rubber pad.
Vibrations from the pump may be transferred to the surrounding
structure and create noise in the 20-1000 Hz spectrum, also
called the bass spectrum.
Correct installation using a vibration-damping rubber pad, flexible
hoses and correctly placed pipe hangers for rigid pipes can
reduce the noise experienced by up to 50 %. See fig. 4.
Place pipe hangers for the rigid pipes close to the connection of
the flexible hose.
4
Pipe hanger for rigid pipe
Flexible hose
Fig. 4 How to reduce noise in the installation
3.3.5 Installation examples
Fittings, hoses and valves are not supplied with the pump.
We recommend to follow the installation examples in sections
3.3.6 to 3.3.8.
3.3.6 Mains water pressure boosting
2
7
10
5
3
Fig. 5 Mains water pressure boosting
Pos. Description
1 Highest tapping point
2 Pipe hangers and supports
3 Isolating valves
4 Flexible hoses
5 Bypass valve
Optional pressure-reducing valve on the inlet side if the
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inlet pressure can exceed 10 bar (145 psi)
Optional pressure-relief valve on the outlet side if the
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installation cannot withstand a pressure of 6 bar (87 psi)
Drip tray. Install the pump on a small stand to prevent
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the ventilation holes from being flooded.
9 Pressure gauge
10 Mains water pipe
Rubber pad
1
3 9 4
6 2
8