8 EN
pressure switch TDS DSP
Operation
Switching the device on
1. Open a consumer at the end of the pressure side, e.g.
water tap or garden sprayer so that any remaining air in
the line is able to escape.
2. Connect the mains plug of the pump with the plug(8) of
the pressure switch.
3. Connect the mains plug of the pressure switch with a
safety socket.
ðThe LED Power(5) is illuminated.
ðThe pressure switch activates the pump.
ðAfter approx. 20 to 25seconds, the pump has built up
the operating pressure. While the pump is in operation,
the LED On(7) is illuminated.
4. Close the tap on the pressure side when the desired
amount of water has been supplied and the air was able to
escape.
ðThe pump continues to operate a little longer, until the
operating pressure that is set in the pressure switch is
reached.
ðIf the pressure switch detects that the flow rate is too
low, it automatically switches off the pump. This serves
as a protection against the pump running dry. In this
case, the LED Failure(6) is illuminated. If so, check
whether the suction hose connected to the pump is
correctly positioned, whether a shut-off valve in the
suction hose is accidentally closed or whether a filter is
contaminated.
Info
It is helpful to fill the suction hose with water to
support the suction procedure of the pump. To do so,
the end of the suction hose has to be provided with a
backflow preventer! Please observe the instructions of
the pump.
If there is no more air in distribution network, opening the water
tap causes the water pressure to drop. This is detected by the
pressure switch. It will automatically activate the garden pump
for as long as the water tap is opened.
After closing the water tap, the pressure in the distribution
network increases. Then the pressure switch switches off after
a few seconds.
Reset
If the pump runs dry and the water flow rate falls below the set
minimum value, the pressure switch switches off the pump for
reasons of safety. The LED Failure(6) is illuminated. Please
proceed as follows to restart the pressure switch and the pump:
1. Stop the pump running dry by filling water into the suction
hose (if possible) or into the pump. For this purpose, many
pumps are equipped with a water filler neck. If necessary,
find out more in the instructions of your pump.
2. When you eliminated the dry run of the pump, press the
button Reset(4) at the pressure switch.
ðThe LED Failure(6) goes out.
ðThe pressure switch activates the pump.
ðThe LED On(7) is illuminated for as long as the pump is
in operation.
Setting the switch-on pressure
Warning
Setting the switch-on pressure may only be carried out
by specialist companies for water installation.
The device is equipped with a pressure setting screw(1). The
setting screw is used to set the pressure value at which the
device switches on the connected pump. For more detailed
information about the required pump pressure please refer to
the start-up chapter.
Please proceed as follows to set the switch-on pressure:
1. Turn the pressure setting screw(1) towards the minus sign
to reduce the switch-on pressure. The minimum switch-on
pressure (screw all the way to the minus sign) is 1.5bar.
ðEvery 360° turn reduces the pressure for approx.
0.2bar.
2. Turn the pressure setting screw(1) towards the plus sign
to increase the switch-on pressure. The maximum switch-
on pressure (screw all the way to the plus sign) is 2.5bar.
ðEvery 360° turn increases the pressure for approx.
0.2bar.
Note for setting the switch-on pressure:
• The switch-on pressure is set too low:
– When the tap is opened, the pump does not start
operating.
– The LED Power(5) is illuminated in green.
– Turn pressure setting screw towards the plus sign.
• The switch-on pressure is set too high:
– The dry-run protection is activated and the pump does
not start operating.
– The LEDs Power(5) and Failure(6) are illuminated
(green/ yellow).
– Turn pressure setting screw towards the minus sign.
• Switch-on pressure is set close to the maximum pressure
of the pump:
