Wilo Sub TWU 4 Serie Instrucciones De Instalación Y Funcionamiento página 41

6.2.2 If the direction of rotation is not correct
When using Wilo switching devices
Wilo switching devices are designed so that the con-
nected products are driven in the right direction. If the
rotation direction is wrong, 2 phases/leads of the
mains supply to the switching device must be replaced.
With switching devices provided by the customer:
If the rotation direction is wrong, with direct start
motors, 2 phases must be swapped. In the case of
star-delta start-up motors, the connections of two
windings must be swapped e.g. U1 with V1 and U2
with V2.
6.3 Adjusting the level-control device
For correct adjustment, please see the installation and
operation manual for the level control device.
Please observe the information on the minimum
water coverage of the product!
6.4 Adjusting the Plug&Pump systems
6.4.1 TWU...P&P/FC (Economy 1)
The fluid control is factory preset.
6.4.2 TWU...P&P/DS (Economy 2)
Specifying the switching on/off pressures
Before the system can be adjusted, the required
switching on and off pressures must be specified.
For the minimum and maximum values, see the over-
view below:
Unit
TWU 4-0407
TWU 4-0409
TWU 4-0414
The following values are factory preset:
• Switch-on pressure: 2 bar
• Switch-off pressure: 3 bar
If other switch-on and switch-off pressures are
required, these must lie within the permissible func-
tioning range of the pressure switch.
After specifying the required pressures for switching
on and off, the diaphragm pressure container must be
pressurized.
Pressurization of the diaphragm pressure container
Check the pressure in the container and fill the con-
tainer through the valve if required. The required con-
tainer pressure is: A switch-on pressure of 0.3 bar.
Pressure manometer
Cut off the nozzles on the manometer to achieve the
required atmospheric pressure equalization.
Installation and operating instructions Wilo-Sub TWU 4..., TWU 4-...-QC, TWU 4-...-P&P
Switch-on pressure Switch-off
pressure
min. 1.5 bar max. 2.8 bar
min. 3 bar max. 6 bar
min. 4 bar max. 9 bar
Adjusting the pressure switch
Fig. 5: Adjusting screws
Adjusting screw for
1
switch-off pressure
The adjustment can only be performed if the system is
sufficiently pressurized.
Functional principle for adjusting the switch-on and
switch-off pressures:
• The adjustment of the switch-on and switch-off pres-
sures is made by turning the respective adjusting
screw.
• Turning the threaded nut clockwise reduces the pres-
sure.
• Turning the threaded nut counterclockwise increases
the pressure.
When the required switch-on and switch-off pres-
sures have been defined and the diaphragm pressure
container has been pressurized, these pressures may
then be adjusted as follows:
• Open the discharge side shut-off valves and a tapping
point to depressurize the system.
• Close the tapping point.
• Open the pressure switch shroud.
• Turn both adjusting screws 1 and 2 clockwise without
fully tightening them.
• The pumps start running to build up the pressure.
• When the desired switch-off pressure is reached (read
this on the manometer), switch off the pump.
• Turn adjusting screw 1 counterclockwise until an audi-
ble "click" can be heard.
• Open the tapping point to allow the system pressure to
reduce to the desired switch-on pressure for the pump
(read this on the manometer).
• Once the switch-on pressure is reached, slowly close
the tapping point again.
• Turn adjusting screw 2 counterclockwise.
If an audible "click" is heard:
• Switch on the pump and check the settings by open-
ing and closing a tapping point.
• If fine adjustments are necessary, proceed according to
the previously described principle.
When the adjustments are completed, close the pres-
sure switch shroud and put the system into operation.
If no audible "click" is heard:
• Check the operating point of the pump and the pres-
surization of the diaphragm pressure container (the
required container pressure is: a switch-on pressure of
0.3 bar).
• If necessary, select new switch-on and switch-off
pressures and reset the pressurization of the dia-
phragm pressure container accordingly.
• Repeat all adjustments until the system is sure to func-
tion as desired.
6.5 Startup
The work area of the unit is not a recreational
area and is to be kept free of persons! No per-
sons are allowed in the work area during switch-
ing on and/or during operation.
English
Adjusting screw for
2
switch-on pressure
41