Suction Pipe Length; Electrical Connection; Starting Up The Product; Priming The Pump - Grundfos SCALA2 Installation And Operating Instructions Manual

3.6 Suction pipe length

The overview below shows the different possible pipe lengths,
depending on the vertical pipe length.
The overview is only intended as a guide.
L
Fig. 7 Suction pipe length
DN 32
H L
[m (ft)] [m (ft)]
0 (0) 68 (223)
3 (10) 43 (141)
6 (20) 17 (56)
7 (23) 9 (30)
8 (26) 0 (0)
Preconditions:
Maximum flow velocity: 1 l/s (16 gpm)
Inside roughness of pipes: 0.01 mm (0.0004 inch).
Size Inside pipe diameter Pressure loss
DN 32 28 mm (1.1 inches)
DN 40 35.2 mm (1.4 inches)

3.7 Electrical connection

3.7.1 Plug connection
Warning
Check that the voltage and frequency of the
product match voltage and frequency of the
installation site.
Warning
If the power supply cable is damaged, it must be
replaced by the manufacturer, his service agent
or similarly qualified persons in order to avoid
hazard.
Warning
As a precaution, the product must be connected
to a socket with earth connection.
We recommend that you fit the permanent
installation with an earth leakage circuit breaker
Note
(ELCB) with a tripping current < 30 mA.
The pump incorporates current and temperature dependent
motor protection.
DN 40
H L
[m (ft)] [m (ft)]
0 (0) 207 (679)
3 (10) 129 (423)
6 (20) 52 (171)
7 (23) 26 (85)
8 (26) 0 (0)
0.117 m/m (5 psi/100 ft)
0.0387 m/m (1.6 psi/100 ft)
3.7.2 Connections without plug
Warning
The electrical connection must be carried out by
an authorised electrician in accordance with local
regulations.
Warning
Before making any connections in the product,
make sure that the power supply has been
switched off and that it cannot be accidentally
switched on.
The product must be connected to an external
mains switch with a contact gap of at least 3 mm
[0.12 inch] in all poles.

4. Starting up the product

Do not start the pump until it has been filled with
Caution
liquid.

4.1 Priming the pump

1. Unscrew the priming plug and pour minimum 1.7 litres (0.45
gallons) of water into the pump housing. See fig. 8.
2. Screw the priming plug on again.
If the suction depth exceeds 6 m (20 ft), it may be
Note
necessary to prime the pump more than once.
Caution
Always tighten priming and drain plugs by hand.

4.2 Starting the pump

1. Open a tap to prepare the pump for venting.
2. Insert the power plug into the socket or turn on the power
supply and the pump will start.
3. When water flows without air, close the tap.
4. Open the highest tapping point in the installation, preferably a
shower.
5. Adjust the pressure to the required pressure by means of the
buttons.
6. Close the tapping point.
Startup has been completed.
Fig. 8 Priming the pump
5