Electrical Connection; Starting Up The Product; Priming The Pump; Shaft Seal Run-In - Grundfos JPC Series Installation And Operating Instructions Manual

2.4 Electrical connection

Carry out the electrical connection according to local
regulations.
Check that the supply voltage and frequency
correspond to the values stated on the nameplate
and that it is possible to make a good earth
connection.
Warning
The electrical installation must be carried
out by an authorised person in accordance
with local regulations and the wiring
diagram in the terminal box.
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 that you provide the
permanent installation with an earth
leakage circuit breaker (ELCB) with a
tripping current equal to or less than 30
mA.
Single-phase motors incorporate a thermal switch
and require no additional motor protection.
6

3. Starting up the product

Warning
Do not start the pump until it has been
filled with liquid.
The pump must not be started more than
20 times in one hour so as not to subject

Caution

the motor to excessive terminal shock.
The pump must not run without delivering
Caution
water for more than five minutes.

3.1 Priming the pump

1. Remove the priming plug. See fig. 6.
2. Fill the pump with water.
3. Refit the priming plug and tighten by hand.
The pump can now be started.
Fig. 6 Priming the pump
If there is a suction lift, up to five minutes may pass
from the moment the pump is started until it delivers
water. This period depends on the length and
diameter of the inlet pipe.

3.2 Shaft seal run-in

The seal faces are lubricated by the pumped liquid,
meaning that there may be a certain amount of
leakage from the shaft seal.
When the pump is started up for the first time, or
when a new shaft seal is installed, a certain run-in
period is required before the leakage is reduced to
an acceptable level. The time required for this
depends on the operating conditions, i.e. every time
the operating conditions change, a new run-in period
will be started.
Under normal conditions, the leaking liquid will
evaporate. As a result, no leakage will be detected.