Wilo Smart 25/4 Instrucciones De Instalación Y Funcionamiento página 17

ENGLISH
observed (e.g. VDE regulati-
ons in Germany).
– According to Part 1 of the VDE
0730, the
connected to the electrical sup-
ply by a solid wire equipped with
a plug or an all-pole switch. The
width of the contact gap must be
at least 3 mm.
– To guarantee protection against
dripping water and the strain
relief of the PG screwed joint, a
connecting cable of suitable
external diameter is to be used
(e.g. H 05 VV-F 3 G 1.5).
– The supply cable must be laid in
such a way that it never touches
the pipework and/or the pump
and motor casing.
– Check that the mains current
and voltage comply with the
data on the rating plate.
– Connect to the mains in accor-
dance with fig. 5 [Phase (L) -
Zero (N) - Earth ( )].
– The pump/installation must be
earthed in compliance with the
applicable regulations.
– After connecting to the electricity
network, lock the terminal box.
6 Operation
Filling and ventilating the unit
The pump may need venting e.g. if
the heating and pump are working
14
pump must
but the heating element remains
cold. If there is air in the pump
chamber, the pump will not pump
be
water.
Carefully fill the unit with water.
The pump rotor chamber will vent
automatically after a short running
period. Brief dry running will not
damage the pump. If it becomes
necessary to vent the pump, plea-
se observe the following procedu-
re:
– Switch off the pump.
Risk of burning if the
pump is touched!
Depending on the opera-
ting condition of the pump
and/or
temperature)
pump can become very
hot.
– Close the valve on the discharge
side.
Risk of scalding!
Depending on the fluid
temperature
system pressure, if the vent
screw is completely loose-
ned hot liquid or gas can
escape or even shoot out
at high pressure.
– Carefully loosen and fully remo-
ve the vent plug using a suitable
screwdriver (fig. 6).
installation (fluid
the entire
and the