Control Elements And Indicator Lights; Level Sensor; Installation; Location - Grundfos LC 220 Montage- Und Betriebsanleitung

4.2 Control elements and indicator lights

The table below gives a description of the function of the various
control elements and indicator lights:
Element Function Description
The operating mode is selected by the
ON-OFF-AUTO selector switch which
has three different positions:
POS I:
Starts the pump manually.
Selection of
POS O:
operating
• Stops the pump manually
mode
• Resets alarm indications.
POS AUTO:
Automatic operation. The pump will
start and stop according to the signal
from the level sensor.
Indication
of power Green indicator light, indicating that
supply the power supply is on.
status
Red and green indicator lights,
Indication
indicating pump status:
of pump
Green: Pump is running.
status
Red: Pump fault.
Red indicator light, indicating high
High-level water level. The LED lights up if the
alarm level sensor measures a certain level
in the collecting tank.
Red indicator light, indicating wrong
Phase-
phase sequence (three-phase pumps).
sequence
Change phase sequence by following
fault
the instruction in fig. 3.
Sensor
Red indicator light, indicating faulty or
failure
missing connection to the level sensor.
alarm
External Red indicator light, indicating an alarm
level alarm from an external level switch.
Yellow indicator light, indicating that it
Indication is time for service. This function can
of time for be switched on and off by the DIP
service switch. The factory setting is one year
according to EN 12056-4.
Fig. 3 Changing phases of a three-phase controller with
phase inverter

4.3 Level sensor

The piezoresistive pressure sensor placed in the controller is
connected via a hose to a pressure tube in the tank. The pressure
tube extends down into the tank. The rising liquid level
compresses the air inside the pressure tube and hose, and the
piezoresistive sensor transforms the changing pressure into an
analogue signal. The controller uses the analogue signal to start
and stop the pump and to indicate high water-level alarm.
The pressure tube is fixed underneath a cap and can be taken out
for maintenance, service and for cleaning the inside of the tube.
Please note that different pressure tubes are used for Multilift and
Unolift. Multilifts have a DN 100 tube with a screw cap, whereas
Unolift comes with a DN 50 tube with a cap to be inserted.
Fig. 4 Pressure tube with hose

5. Installation

Warning
Before making any connections in LC 220 or
working on pump, pit, etc., make sure that the
power supply has been switched off and that it
cannot be accidentally switched on.
The installation must be carried out by authorised personnel in
accordance with local regulations.

5.1 Location

Warning
Do not install the LC 220 controller in explosion
hazard areas.
LC 220 can be installed at ambient temperatures ranging from
0 °C to +40 °C.
Enclosure class: IP56.
Install the controller as close as possible to the lifting station.
When installed outdoors, LC 220 must be placed in a protective
shed or enclosure. LC 220 must not be exposed to direct sunlight.
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