How To Enable Bluetooth On The Operating Panel; How To Disable Bluetooth On The Operating Panel; Testing The Product; Product Introduction - Grundfos CU 241 Instrucciones De Instalación Y Funcionamiento

Related information
6.22 Starting the startup wizard with the operating panel

3.4 How to enable Bluetooth on the operating panel

If the Bluetooth signal on the operating panel has been disabled for
some reason, you are not able to connect with Grundfos GO
Remote. You must enable Bluetooth first.
1. Press and hold the connect button on the operating panel for
15 seconds. Wait for the blue LED to light up.
2. Press the Bluetooth CONNECT button on Grundfos GO
Remote.
3. Press the connect button on the operating panel. The blue LED
above the connect button is flashing blue until your device is
connected.
Grundfos GO Remote is now loading the data for the product.
Related information
3.1 Connecting to Grundfos GO Remote

3.5 How to disable Bluetooth on the operating panel

In some installation areas, it is not allowed to have a Bluetooth
signal enabled during operation. After installation, the Bluetooth
signal must be disabled manually.
1. Press and hold the connect button on the operating panel for
15 seconds. Wait for the blue LED to switch off.
Grundfos GO Remote is no longer connected to the product.
Related information
3.1 Connecting to Grundfos GO Remote

3.6 Testing the product

When you have made all the electrical installations and completed
the startup wizard, you can test the system.
For emptying applications:
• Fill the pit with water and check that the pump starts
automatically at the defined level.
• Test the dry-running function by starting the pump manually
and wait while the pit with the pump is emptied. Check that the
control unit indicates an alarm and stops the pump when the
defined level is reached.
• 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.
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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.
The control unit is only intended for use in control panels.
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:
• 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

4.4 Application types

You can choose between two application types:
• Empty
• Fill.
You can set the application type with Grundfos GO Remote.
Empty
Pos. Description
1 High level
2 Not in use
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.
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.
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