Product Introduction; Product Description; Intended Use; Features - Grundfos LC 241 Montage- Und Betriebsanleitung

• Test the high-level function by stopping the pump manually and
continue to fill the pit with water. Check that the control unit
indicates an alarm when the defined level is reached. Set the
pump to Auto and observe that the pump starts and stops
when the stop level has been reached.
For filling applications:
• Start by draining the tank to be filled. When the tank is empty
and the start level is reached, the pump must start. When the
tank is full and the stop level is reached, the pump must stop.
• Test the high-level function by stopping the pump manually and
continue to fill the tank without the pump with water. Check that
the control unit indicates an alarm when the defined level is
reached.
• Test the dry-running function by starting the pump manually
and wait while the tank with the pump is emptied. Check that
the control unit indicates an alarm and stops the pump when
the defined level is reached. If the pump is placed in a well, this
test may not be possible since the pump cannot empty the well.
Alternatively, pull the dry-run level switch up to simulate a dry-
run situation. The same can be done with a pressure level
sensor.

4. Product introduction

4.1 Product description

The level-control unit switches the pump on and off according to the
liquid level measured by float switches or a pressure sensor. When
the start level is reached, the pump starts, and when the liquid level
has been lowered to the stop level, the pump is stopped by the
control unit. An alarm is indicated in case of for example high-water
level in the tank or sensor failure.
Basic settings are configured via the operating panel and advanced
settings are configured with Grundfos GO Remote. Furthermore,
you can read important operating parameters with Grundfos GO
Remote.

4.2 Intended use

The product is designed to control one pump or two pumps.
The product can be configured for two purposes: emptying a
wastewater pit or filling a pit or tank. The product can be used for
network pumping stations, main pumping stations, commercial
buildings and municipal systems.
If the product is used in an explosive environment, follow local
regulations. If required use additional equipment.
The product must not be exposed to aggressive solvents or oil-
containing liquids.

4.3 Features

The control unit features among others the following functions:
• support of up to two pumps
• manual and automatic control of the pump
• Bluetooth pairing with Grundfos GO Remote
• operating indication, such as power on and pump running
• alarm and warning indication, such as power phase missing
and high-water level
• motor and phase failure protection
• setting of stop delays matching the actual operating conditions
• automatic alternation of pumps.

4.4 Application types

You can choose between two application types:
• Empty
• Fill.
You can set the application type with Grundfos GO Remote.
12
Empty
Pos. Description
1 High level
2 Start level P2: start level for pump 2
3 Start level P1: start level for pump 1
4 Stop level
5 Dry-running level
The pump will start to empty the tank or pit when Start level P1 is
reached.
A second pump will start if the liquid level reaches Start level P2.
The pump stops when the liquid level is lowered to Stop level.
If the inflow of liquid exceeds the capacity of the installed pump, the
level in the tank or pit will rise. Eventually, the High level sensor will
register a high liquid level in the tank or pit. If set, the signal from
the High level sensor can be used to activate an output relay which
can then be used to give a visual or acoustic alarm or send a signal
to a SCADA system.
If the pump is running and the liquid level in the tank or pit falls
below the dry-running level, the dry-running protection will stop the
pump to ensure that it is not damaged mechanically.
Fill
Designation Description
1 High level
2 Stop level
3 Start level P1: start level for pump 1
4 Start level P2: start level for pump 2
5 Dry-running level
In the filling application, the pump is installed in a tank or well from
where it pumps the liquid. The liquid is pumped into a second tank
where the level sensors are installed.
The pump will start to fill the second tank when Start level P1 is
reached.
A second pump will start if the liquid level reaches Start level P2.
The pump stops when the liquid level reaches Stop level.
If the pump for some reason does not stop at Stop level and the
liquid level keeps rising, the High level sensor will eventually
register this. If set, the signal from the High level sensor can be
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