Electrical Connection - Wilo Jet WJ Série Notice De Montage Et De Mise En Service

5. Sitting/lnstallation
5.1 Installation
The pump must be operated in strict com-
pliance with local water supply regulations.
Requirements on installation location:
– easy to reach
– well vented, dry and frostfree
– Installation on a concrete socket or directly on a
smooth and horizontal floor, by use of 2 screws
Ø 8 mm.
lt is the Operators responsibility to take all pre-
ventive measures (e. g. provision of alarm sys-
tems, standby pump, etc.) to avoid consequential
damages such as flooding due to pump
failure.
– Suction and discharge piping to be provided on
site by others.
– When using solid pipe connections the pump
must be firmly fixed to the floor.
– If not firmly fixed, flexible connectors must at
least be used for suction and discharge ports.
– The suction pipe must be fully airtight and be
installed free of stress, steadily rising towards
the pump.
– Suction lifts above 5 metres require a suction
pipe size of not less than 1
– Discharge pipe connections must be free of
stress on the pump.
ATTENTION! In order to ensure proper operation
a static discharge head of 30 cm is required; the
discharge pipe must thus be installed with a rise
of at least 30 cm.
– A foot valve is required at the end of the suc-
tion line. lt must be located not less than 30 cm
below the lowest water level. Recommended
is the use of a suction hose set (optional extra)
consisting of suction hose, suction strainer and
foot valve.

5.2 Electrical connection

ATTENTION! Connections and checks should be
carried out by a qualified electrician, in compli-
ance with current local standards.
The power supply of the pump must include a
circuit having a residual current difference device
(earth fault breaker) acting at no more than 30
mA.
In case of cord damaged, make it replace by a
qualified electrician.
– See name plate of the motor for electrical char-
acteristics (frequency, voltage, nominal current).
– Means for disconnection must be incorporated
in the fixed wiring in accordance with the wiring
rules.
– Single-phase motor
The single-phase motors have an integrated
thermal protection. If an extension is added to
the cord supplied with the motor, it must comply
with the applicable standards: 3 conductors (2
phases + earth).
WILO SE 08/2017
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– Three-phase motors
The electrical connection must be as shown by
the diagram inside the cover of the terminal box
(see Fig. 3). Use an electrical cable conforming
with the standard in force (H07 RNF 4 G1 mm²
external diameter: 10 mm max): 4 conductors (3
phases + earth).
– The motors must be protected by a cir-
cuit-breaker set to the current mentioned on the
name plate of the motor. Provide a fuse discon-
necting switch (type aM) to protect the mains
supply.
ATTENTION! DO NOT FORGET TO CONNECT THE
EARTH.
A connection error would damage the motor. The
power cable must never touch the pipe or the
pump ; make sure that it is sheltered from any
humidity.
6. Commissioning
– Check to ensure that a sufficiently high water
level is available in the open break tank or bore.
Dry-running of the pump must be prevented as it
will lead to destruction of the mechanical seal.
– Fill pump and suction line via the fill plug. Only a
filled pump has self-priming capacity.
– Open discharge isolating valve(s) to allow free air
evacuation from the suction pipe.
– Three-phase motors require a rotation check:
Briefly switch on the pump and check whether
actual direction of rotation corresponds with the
arrow on the fan hood of the motor. II necessary,
change any two supply phases.
– Never use the power supply cable for lifting,
transporting or fixing of the pump.
– The pump must not be subjected to direct water
spray.
7. Maintenance
Isolate from power supply before checking the
pump!
In principle, damage to the connecting cable
should only be repaired by a qualified electrician.
To ensure highest operational safety and reliabil-
ity at lowest possible cost the following routine
checks are recommended:
– Check on diaphragm vessel pressure (at least
1.4 bar on standard settings of pressure switch).
– Check pump for leaks.
On danger of freezing it is necessary to com-
pletely drain the pump using the drain plug at the
bottom of the pump housing.
For prolonged standdown periods (e. g. winter
shutdown) the pump needs thorough scouring,
complete draining and dry storage.
On re-commissioning check tor free rotation by
brieflyswitching-on the pump. Then re-fill with
water.
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