English
26
WILO SE 11/2010
Table 1:
Gas supply pressure PN2 diaphragm pressure ves-
sel in relation to the switch-on pressure pE
Conversion of pressure units:
1 bar = 100000 Pa = 0.1 MPa = 0.1 N/mm²
= 10200 kp/m² = 1.02 kp/cm² (at)
1 bar = 0.987 atm = 750 Torr = 10.2 m/Ws
8.2
Filling and bleeding
Only a completely filled pump without air inclu-
sions can draw in fluid optimally. Perform filling
and bleeding as follows:
a) Pump with inlet pressure (Fig. 2)
• Close stop valve on the pressure side (Fig. 2,
no. 12)
• Undo filling/vent screw (Fig. 1, no. 2)
• Slightly open stop valve on the intake side
(Fig. 2, no. 11), until water emerges from the
filler opening and the pump is completely bled.
WARNING! Risk of scalding!
Depending on the temperature of the fluid and
the system pressure, when the vent screw is
opened completely, hot or gaseous fluid may
escape or shoot out at high pressure.
• Screw the filler screw back in tightly when the
water emerges free from bubbles
• Open the stop valve on the pressure side (Fig. 2,
no. 12)
• Continue commissioning with the pressure switch
setting
b) Self-priming pump in suction mode (Fig. 3)
(maximum suction head 8 m)
• Open the check valve on the pressure side (Fig. 3,
no. 12)
• Remove the filler screw (Fig. 1, no. 2)
• Using a funnel, slowly and completely fill the
pump at the filler opening, until water emerges
from the opening
• Screw the filler screw back in tightly when the
water emerges free from bubbles
• Continue commissioning with the pressure
switch setting
WARNING! Risk of burns!
The entire system may get very hot, depending
on the operating status of the domestic water
system (temperature of the fluid). Risk of burns
on contact!
NOTE:
This pump is not allowed to be operated for more
than 10 minutes with volume flow Q = 0 m
3
/h
(closed stop valve)
c) Non-self-priming pump in suction mode (Fig. 3)
(max. suction head HA = 7 m)
• Open check valve on the pressure side (Fig. 3,
no. 12)
• Remove filler screw (Fig. 1, no. 2)
• Using a funnel, slowly and completely fill the
pump at the filler opening, until water emerges
from the opening
• Screw the filler screw back in tightly when the
water emerges free from bubbles
• Start the domestic water system briefly (approx.
20 sec.) so that the air will collect in the pump
housing.
• Switch off the domestic water system
• Repeat the filling procedure until the pump and
suction line have been completely bled.
• Continue commissioning with the pressure switch
setting
WARNING! Risk of burns!
The entire system may get very hot, depending
on the operating status of the domestic water
system (temperature of the fluid) Risk of burns
on contact!
NOTE:
The pump is not allowed to be operated for more
than 10 minutes with volume flow Q = 0 m
3
/h
(closed stop valve).
Rotation direction monitoring (only for three-
phase AC motor version
DM):
Switch on briefly to
check whether the sense of rotation of the pump
matches the arrow on the pump housing. If the
sense of rotation is wrong, swap over 2 phases in
the terminal box of the pump.
DANGER! Danger of death!
Electrical connection must be carried out by an
electrician authorised by the local electricity
supply company and in accordance with the
applicable local regulations [e.g. VDE regula-
tions].
8.3 Setting the pressure switch
NOTE:
The switch-on and switch-off pressures of the
pressure switch have been factory-set according
to the characteristic curve of the pump used
(see rating plate).
To adapt to local conditions, it is possible to
change or adapt the settings of the pressure
switch as follows.
The switch-off pressure (setscrew Fig. 4a/4b,
no. 1 or 5a/5b, no. 1) and the pressure difference
(setscrew Fig. 4a/4b, no. 2 or 5a/5b, no. 2) are set
in relation to the switch-on pressure at the pres-
sure switch (version EM and DM).
pE
[bar]
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
PN2
[bar]
1.8
2.3
2.8
3.2
3.7
4.2
4.7
5.2
5.7
6.1
6.6
7.1
7.5
8
8.5
9
9.5
