Electrical Connection; Checking The Direction Of Rotation (Three-Phase Motors) - Grundfos JP 6 Installation And Operating Instructions Manual

5.2.1 Ejector valve setting
The ejector valve in the plug hole (V) can be turned
to two positions. See fig. 4.
Figure 3 shows an example of how the ejector valve
position may affect the QH curve.
[m]
45
40
35
30
25
20
15
10
5
0
0.0 0.5 1.0 1.5
Fig. 3 QH curve and ejector valve positions
Pos. 1
Turn the valve to the left (out).
Select pos. 1 when the suction pipe is empty and the
pump is to be primed.
Select also pos. 1 when a small quantity of water and
a high pressure are required.
Pos. 2
Turn the valve to the right (in).
Select pos. 2 when the pump has been primed, and
a large quantity of water and a low pressure are
required.
Pos. Ejector valve
1
2
Fig. 4 Ejector valve positions
8
J P 5
IS O 9906 An
2.0 2.5 3.0 3.5 4.0 Q
Direction
Left
(out)
Right
(in)

6. Electrical connection

Carry out the electrical connection according to local
regulations.
Warning
During electrical installation, make
sure that the power supply cannot be
accidentally switched on.
Warning
The pump must be connected to an
external mains switch with a minimum
contact gap of 3 mm in all poles.
As a precaution, the pump must be
connected to a socket with earth
connection.
We recommend to fit the permanent
installation with an earth leakage
circuit breaker (ELCB) with a tripping
≤
current 30 mA.
Single-phase motors incorporate a thermal switch
and require no additional motor protection.
Three-phase motors must be connected to an
external mains switch and a motor-protective circuit
breaker.
Carry out the electrical connection as shown in the
diagram on the inside of the terminal box cover.
6.1 Checking the direction of rotation
(three-phase motors)
Warning
Do not start the pump until it has been
filled with liquid.
Arrows on the motor fan cover indicate the correct
direction of rotation.
If the direction of rotation is wrong, switch off the
power supply and interchange any two of the
incoming supply wires.