7 Operation
EN
22
Rittal LCU DX
7
Operation
This section describes operation of the LCU DX using
the control and display devices.
7.1
Control and display devices
Control and display device 1 is located in the 3 U trim
panel on the maintenance side of the rack. In the "single"
version, there is one such display device installed, and in
the "redundant" version there are two.
Fig. 14:
Control and display device 1
Key
1
ON/OFF button
2
"Up" button (temperature)
3
"Down" button (temperature)
Control and display device 2 is likewise located in the
3 U trim panel on the maintenance side of the rack. In
both the "single" version and in the "redundant" version,
there is only one control device of this type installed.
In addition to control and display device 1, control and
display device 2 regulates the start-up response follow-
ing a power failure or if the minimum cooling load is un-
dercut.
Fig. 15:
Control and display device 2
Key
1
"Up" button (temperature)
2
"Down" button (temperature)
3
ON/OFF button
4
Set button
5
Defrost switch (deactivated)
6
Light
Control and display device 3 is located on the end face
of the internal unit. In the "single" version, there is one
such control and display device installed, and in the "re-
dundant" version there are two.
The operating status can be read from control and dis-
play device 3 on the internal unit. In addition to the con-
trol lights for operation, malfunction and defrost, the set
temperature or a fault code can be read from the two-
digit LCD display.
Fig. 16:
Control and display device 3
Key
1
Manual (to request operating statuses)
2
Operation (permanently illuminated during operation,
flashes when the system is being booted up)
3
Timer (no function)
4
DEF/FAN (no function)
5
Alarm (flashes red in case of malfunction)
6
LCD display 1 and 2 (displays a fault code in case of an
alarm)
7.2
Switching the LCU DX on and off
7.2.1
Switching on the internal and external units
Once both the internal unit and the external unit are elec-
trically connected, carry out the following two steps:
Switch on the on-site power supply to the external
unit.
The internal unit is supplied with power via the external
unit.
Switch on the LCU DX on control and display device 1
using the "ON/OFF button".
7.2.2
Switching off the internal and external units
To switch off the LCU DX and the condenser, proceed
as follows:
Switch off the LCU DX on control and display device 1
using the "ON/OFF button".
Switch off the on-site power supply to the external
unit.
7.2.3
Switching off in an emergency
To switch off the LCU DX in an emergency, proceed as
follows:
Switch off the on-site power supply to the external
unit.
7.3
Setting the setpoint temperature
The setpoint temperature (outlet temperature of the in-
ternal unit or server air intake temperature) is set on con-
trol and display devices 1 and 2 using the arrow keys. It
is essential that both values are set identically.
Observe the manufacturer's information on temperature
settings for the components built into the server enclo-
sure. We recommend a setting within the range 22°C–
25°C. Because the LCU DX cannot actively regulate hu-
midity, where necessary the set temperature should be
adjusted in line with the ambient conditions.
2
1
3
2
1
3
5
6
4
1
2
3
4
5
6
7
