English
16
WILO AG 01/2008
8 Commissioning
8.1 Commissioning
NOTE: The pump will not start if the connection is
incorrect.
CAUTION! Risk of damage!
Risk of damage of the mechanical seal. Never
allow the pump to run dry, even for a short time!
• Check all the electrical connections, the electrical
protection and also the fuses once more.
• Check the current consumption phase by phase
and compare with the values on the name plate.
Never exceed the current consumption permit-
ted for the motor.
• Check the voltage with the motor running.
Permitted tolerance: +/- 10 % von U
N
.
• Vent the pressure port to avoid pressure surges
when starting.
• The slide valves on the pressure side must be half
open for the first commissioning so that the pipe
can be vented.
• Never operate the pump for more than 2 minutes
with the valve closed.
8.2 Adjustment of Sub-Economy 1
The Fluid control is already pre-set at the works.
8.3 Sub-Economy 2 settings
8.3.1 Pressurisation of the diaphragm pressure vessel
• Check the tank pressure and fill the tank via the
valve if necessary.The necessary tank pressure is:
start-up pressure -0.3 bar.
8.3.2 Pressure gauge
• Cut off the sockets on the pressure gauge to cre-
ate the necessary atmospheric pressure balance.
8.3.3 Setting the pressure switch (Fig. 3)
The adjustment can only be made if the system
has been adequately pressurised.
Principle: The switch-off pressure is set by turning
the threaded nut (1). The set pressure is set by
adjusting the nut.
• Turn the threaded nut (2) in the clockwise direc-
tion: Reduction of the start-up pressure (the pres-
sure difference increases).
• Turn the threaded nut (2) in the clockwise direc-
tion: Reduction of the start-up pressure (the pres-
sure difference increases).
Establish the necessary switch-on/switch-off
pressures before setting the pressure switch.
If other switch-on/switch-off pressures are nec-
essary, these must be within the permitted func-
tion range of the pressure switch.
After establishing the necessary switch-on/
switch-off pressures, the adjustments are made
as follows:
• Open check valves on the pressure side and a tap
connection to depressurise the system
• Close the tap again.
• Open the pressure switch hood.
• Turn the adjusting nuts (1, 2) in the clockwise
direction without tightening them.
• Start the pump and build up the pressure.
• When the required switch-off pressure has been
reached (read it off at the pressure gauge), switch
off the pump.
• Turn the threaded nut (1) anti-clockwise until you
hear a click.
• Open the tap to reduce the system pressure to the
required start-up pressure of the pump (read off
on the pressure gauge.Close the tap again slowly
once the pressure is reached.
• Turn threaded nut (2) anti-clockwise.
• If you hear
a "click"
:
• Switch on the pump and check the settings by
opening and closing a tap.
• If necessary, make fine adjustments according
to the principle described above.
• When the adjustments have been completed,
close the pressure switch hood and start up the
installation.
• If you do not hear
a "click"
:
• Check the duty point of the pump and the pres-
surisation of the diaphragm pressure vessel (the
necessary tank pressure is: start-up pressure -
0.3 bar)
• If necessary, select new switch-on/switch-off
pressures and re-set the pressurisation of the
diaphragm pressure vessel accordingly.
• Make all the adjustments again until the required
function of the installation is guaranteed.
8.4 Medium temperatu
re
At nominal current, submersible pumps may be
operated between a minimum temperature of 3°C
and a maximum temperature of 30°C. To guaran-
tee cooling of the motor at higher temperatures,
the flow rate must be reduced proportionally to
the motor power (see following table).
NOTE: Do not operate the motors at medium tem-
peratures that exceed 55°C!
Pump type
Start-up
pressure
Switch-off
pressure
TWU 4-0405 EM
1.5 bar
2.8 bar
TWU 4-0410 EM
3.0 bar
6.0 bar
TWU 4-0415 EM
4.0 bar
9.0 bar
Medium temperatu
re
Water
temperatur
e
Adjustment (%) of the nominal
current from 0.37 kW to 5.5 kW
35°C
95 %
40°C
95%
45°C
90%
50°C
80%
55°C
70%
Summary of Contents for Wilo-Sub TWU 4 Series
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