Electrical Connection; Start-Up; Filling The Motor With Oil; Pump Priming - Steffens WL Bedienungsanweisung

6. Electrical connection

Before removing the terminal box cover and
before any removal/dismantling of the pump,
make sure that the electricity supply has been
switched off.
The electrical connections should be carried out by an authorized
electrician in accordance with local regulations and the wiring
diagram shown below. The required pressure switch should be
connected to the 1/2" sleeve of the tank.
Maximum cut-out pressure for pumps with built-
in automatic pressure relief unit:
3.5 bar for 4-bar pumps and tanks, 5.5 bar for 6-
bar pumps and tanks.
The pressure switch should never be installed in
Caution
the discharge pipe as the pressure switch will
flutter due to the intermittent operation of the
piston pump. In order to modify the cut-out
pressure, follow the operating instructions of the
pressure switch.
L1
L2
L3
N
PE
p
U1 V1 W1 PE
M
3
Fig. 11
The motor starter overload should be set to the
Caution
rated current.
In case of power failure and open water taps, air
may slip into the system. When starting up again,
the air will escape under pressure.

7. Start-up

When pumping drinking water, the pump should
be flushed through with clean water before start-
up in order to remove any foreign matters such
as preservatives, test liquid or grease.
In the first few days after start-up, it is normal
that the rubber seals leak because the rubber
seals must swell at first, e.g. the upper and lower
seal on the valve plate.
L
N
PE
p
L N PE
M
1

7.1 Filling the motor with oil

Fig. 12 Filling the motor with oil
Fill the motor with oil through the dipstick hole until the upper
dipstick mark. Use branded oil having a viscosity of SAE 30.
WL 1002 - 2404: ca. 0.12 l
WL 2502 - 3003: ca. 0.45 l
WL 4000 - 5000: ca. 0.80 l

7.2 Pump priming

Fill water into the air chamber through the filling holes. During this
process, the pump pulley should be turned several times by hand
in order to fill the cylinder compartment with water. After filling,
replace and tighten the lock screw, start the pump and check the
direction of rotation (the pump should rotate counter-clockwise
when looking at the pump pulley - indicated by an arrow on the
housing).
Fig. 13 Pump priming

8. Maintenance

Before starting work on the pump, make sure that
the electricity supply has been switched off and
that it cannot be accidentally switched on.
The tank pressure should be released. This
maintenance work must only be carried out by
qualified persons!

8.1 Lubrication

The oil level should be checked every three months. Fill up, if
required. Carry out the first oil change three month after start-up
and after this every two years. If the system is operated
continuously, change oil every six months. Drain off the old oil by
unscrewing the oil drain plug.
When changing or draining off oil, make sure to
collect the oil in a suitable container in order to
protect the groundwater.
WN 201: ca. 0.55 l
WN 301: ca. 0.55 l
WN 500: ca. 1.80 l
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