8
WILO SE 02/2016
English
- Position the switch of pump 1 on “HAND", the
pump shall start (LED lit on the control box);
check the correct sense of rotation of the motor.
- Proceed in the same way for pump 2.
- In case of wrong direction, reverse 2 wires of the
phase.
WARNING!
Before changing over the phases,
switch off the installation main switch.
- After this operation, position the pump switches
on “OFF“.
8.4 Setting description
8.4.1 Pressure switch setting (Fig. 8)
The adjustment is made by turning the nut
(pos. 1) to set the high point (stopping of pump)
and the nut (pos. 2) to adjust the low point
(starting of pump).
- Turning the nut (pos. 1) clockwise increases the
value of the hight point.
- Turning the nut (pos. 2) clockwise decreses the
value of the low point (the difference increases).
Before adjusting pressure switches PR1 and PR2 ,
choose the starting and stopping pressures (if nec-
essary, use the nomographs).
Proceed as follows:
Remove the cover of contactor PR1.
Turns the nuts (item 1 & 2)
fully clockwise without tightening them.
Set the switch of on pump to “MANU” and hold to
increase the pressure in the installation.
Release the switch at the desired pump stopping pressure
(read on pressure gauge).
Turn the nut (item 1) anticlockwise until there
is an audible click.
Open the discharge valve to lower the pressure
to the desired pump starting level
(read on pressure gauge).
Turn the nut (item 2) anticlockwise.
If there is a click.
Set the switch of one pump to
“AUTO” and hold to check
you adjustments.
adjustment OK
Put the cover
back on.
Remove the
cover of
contactor
PR2.
Commission
Adjustments
imprecise.
See § "prin-
ciple" and refi-
ne the
Adjustments.
adjustment OK
If no click.
Check your operating points
and the tank pre-pressuri-
zation pressure
(it must be 0,3 bar
less than the pump
starting pressure).
If necessary, choose 2 new
points and adjust the pre-
pressurization pressure.
NOTE : the high points (pressure – stop) of both
pumps are similar. The low points (pressure –
start) show a deviation of 0.5 bar Pf from PR2
< 0.5 Pf from PR1.
8.4.2 Setting of the motor protection
Check voltage set on thermal relays
(Fig. 3, pos. 5) by comparing with the data men-
tioned on the pump type plates. If need be reset
the value by turning the thumb wheel.
8.4.3 Float switch for connection to a tank
Set the float switch in order to keep a minimum
water level about 40 cm over the booster inlet
port to be able to resist to the strainer foot-
valve.
Be sure the electric connection is right by activat-
ing the float switch per hand to generate the
lighting of the dry running LED on the control box.
