Hydraulic Connections; Electrical Connection - Wilo Initial JET System 4-4-50 Notice De Montage Et De Mise En Service

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5.2 Installation
Install the system on a smooth, level floor or on
a concrete foundation block with attachment by
anchor bolts.
Place an insulating material (cork or reinforced
rubber) under the concrete block to prevent any
transmission of flowing-water noise.

5.3 Hydraulic connections

Water supply
• With a reinforced hose, a spiral wrap or a pipe.
• Water used for the domestic water system may
be taken from:
- a well -the pump's max. suction head must be
considered;
- a storage tank.
• It is essential to provide a foot valve for the
strainer in the case of a well or a stream.
• The diameter of the suction piping must never
be smaller than that of the pump. Limit the hori-
zontal length of the suction piping and avoid all
causes of head losses (necking, bends, etc.).
• No air leak can be allowed in this suction piping.
Use supports with collars for rigid pipes so that
the pump does not bear the weight of the pipes.
Distribution
• By Ø 1» - 26/34 threaded piping connected to
the brass coupling on the pump outlet.
• Thoroughly seal the piping with suitable products.
CAUTION! Bear in mind that the altitude of the
place of installation and the water temperature
may reduce the suction head of the pump.
Altitude Loss of head
0 m
500 m 0.60 m w.g.
1000 m 1.15 m w.g.
1500 m 1.70 m w.g.
2000 m 2.20 m w.g.
2500 m 2.65 m w.g.
3000 m 3.20 m w.g.
CAUTION! In order to separate the domestic
water system from the installation for adjustment
purposes or other works, install valves (quar-
ter-turn or similar) at both suction and discharge
piping (Fig. 1, pos. 11, 12).

5.4 Electrical connection

DANGER! Connections and checks should be car-
ried out by a qualified electrician, in compliance
with current local standards.
Power supply network
Single-phase 230 V: connect using the cord
(H07RN-F or equivalent) with normalised plug
(Fig. 1, pos. 6).
12
Temperature
0 m w.g. 20°C
30°C
40°C
DO NOT FORGET TO CONNECT TO EARTH.
DANGER! 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. Commisioning
CAUTION! The system must never be operated in
a dry state, not even briefly.
6.1 Pressurisation of tank
Check the tank pressure and correct it if necessary
by pressurising via the tank valve (Fig. 1, pos. 9).
The pressure must be 0.3 bar less than the pump's
starting pressure.
6.2 Filling and venting
Pump under pressure
• Close the discharge valve.
• Unscrew and remove the filling plug.
• Gradually open the suction valve and proceed to
fill the pump completely via the filling port.
• Screw the filling plug back when the water has
flowed out and air has completely escaped.
Pump in suction mode
Only one filling is enough for priming the pump.
• Open the discharge valve (pos. 12).
• Open the suction valve (pos. 11).
• Unscrew and remove the filling plug (pos. 2).
• Insert the funnel into the port, fill the pump
slowly and completely.
• After water flows out and all air has escaped, fil-
ling is completed.
• Screw the plugs back in.
Loss of head
6.3 Adjustment of pressure contactor (Fig. 3, 4)
0.20 m w.g. The adjustment of pressure contactor is made at
factory. But it's possible to change it.
0.40 m w.g.
Proceed as follow:
0.70 m w.g.
• Unscrew the nut (pos. 1) of the setscrew for
pressure difference.
• Adjust the pump's switch-on pressure the nut
(pos. 2).
• Adjust the setscrew for pressure difference (pos.
1) to obtain the impact pressure of the pump.
NOTE: The selection of the switch-on and switch-
off points of the pump must be compatible with
the operating range of the contactor (Fig. 4).
7. Maintenance
• The motor bearings are lubricated for life.
• The mechanical seal does not require any main-
tenance during operation.
• In the case of a longer shutdown or frost, it must
be drained by unscrewing the bottom plug.
CAUTION! Fill the pump before restarting it.
Do not let the pump run more than a few
minutes with a closed discharge valve.
WILO SE 02/2018