Liquid Cooling Unit LCU CW

SK 3313.610 Liquid Cooling Unit LCU CW

The unit essentially comprises an air/water heat exchanger, EC fans and
the controller. It is used to dissipate heat from network/server racks
and ensures the effective cooling of the built-in components.
The unit is installed at the side adjacent to the 482.6 mm (19") level
in a network/server rack or security safe. The dimensions make it
suitable for installation in server racks with a width of > 800 mm, a
depth of > 1000 mm and a height of > 2000 mm It may be installed on
either the right or left side of the rack.
The unit has 3 fan modules, each with 3 EC fans. Fan modules may be
replaced while the system is still operational. By default, the fan
speed is controlled to the temperature difference between the
temperature in front of and behind the heat exchanger.
Optionally, it may also be controlled to the pressure difference in
front of and behind the servers. The required pressure difference is
adjustable.
The heated air is drawn in at the rear third of the rack, cooled via the
heat exchanger, and then expelled from the end face in the front section
of the rack. Air routing is horizontal. The device regulates the server
intake air temperature, which is individually adjustable.
The water connections are located on the end face of the device facing
the server rack door (G ¾" AG). The connections are readily accessible
and the pipework inside the server rack or micro data centre may be
fitted at the top, side or bottom.
Integral leak monitoring is included. A sensor installed in the
condensate tray detects leaks. The controller issues an alarm and
interrupts the supply of cooling medium. All components in the
condensate section are made from non-corroding materials.

The quantity of condensate produced if the temperature drops below the
dew point can be minimised or eliminated altogether using the condensate
prevention function. The function is activated by default, but may be
deactivated if necessary. If the temperature is approaching the dew
point, the server intake air temperature is increased until it is
sufficiently far above the dew point.
The unit is equipped with a 7-segment display.
The unit features an NFC interface with a parametrisation app.
The unit is equipped as standard with an integral controller for linking
into the network which monitors and controls operation. The setpoints,
alarm thresholds and response in emergency mode can be set within the
admissible limits. If the controller should fail, an integral fail-safe
mode allows the device to continue cooling. The operator can choose
whether the device should continue operating at the set fan speed and
water volume when the controller failure occurred, or alternatively, may
select and pre-set the fan speed and flow rate of the cooling medium for
emergency mode.
The following controller interfaces are accessible from the outside
(device end face at the top rear):
2 network interfaces (Ethernet to IEEE 802.3 via 10/100/1000 Base T)
USB interface as an external memory
USB C interface for servicing
Alarm relay as a change-over contact 48VDC/1A
CAN bus connection for 16 Rittal CMC III sensors
A software concept for setting and monitoring all technical parameters
is pre-integrated as standard.

Network interfaces: 2xRJ 45 (switched), 10/100/1000 Mbit/s each
Supported protocols: IPv4 / IPv6,
integral web server, HTTP, HTTPS, SSL, SSH,
NTP, Telnet, TCP/IP v4 and v6, DHCP, DNS, NTP,
Syslog, SNMP v1, v2c and v3, Traps,
OPC-UA, Modbus/TCP,
FTP/SFTP (update / file transfer),
email transmission (SMTP)
NFC interface with parametrisation app
User administration including rights management: Yes
LDAP(S) / Radius connection: Yes
USB port for firmware update / data logging function: Yes
Initial commissioning / mass configuration via predefined CSV file
CAN bus interface: RJ45, for connection of ) pc(s) CMC III sensors
Optional CAN sensor types: Temperature,
temperature/humidity (combined), infrared access sensor,
leaks, airflow, EFD, smoke detector,
vandalism, differential pressure
Alarm relay: 48V DC/1A
Serial interface:
RS232 (RJ 12) for LTE unit 7030.571
Conformity: CE, UL-listed, CB report
Standards:
Safety: EN 62368
EMC:
EN 55022 / B
EN 61000-4-2
EN 61000-4-3
EN 61000-6-2
EN 61000-6-3
Low-voltage directive: 2014/35/EU
EMC directive: 2014/30/EU
MTBF (at 40 °C) 100,000 hours
Protection category: IP20 (EN 60529)
Protection class: Class 1
Contamination level: 2
Overvoltage category: II
Environmental characteristics: 2011/65/EU (RoHS 2), WEEE
Storage temperature: -20 °C to +70 °C
Ambient temperatures +5 °C to +50 °C
Ambient humidity: 10 - 95% relative humidity, non-condensing
Operating altitude (max.): 3000 m asl

Technical specifications for the device:
Dimensions WxHxD: 110x1866.5x756 mm
Cooling output: 7.9 kW at 15 °C water inlet temperature and 24 °C server
intake air temperature
Air throughput (unimpeded airflow) 1500 m³/h
Rated voltage 90-264 V / 1~ 50/60 Hz
Rated output 0.5 kW
Operating temperature range 10-50 °C
Water connections ¾" AG
Coolant: Water / water/Antifrogen N
Cooling medium temperature range 10-30 °C, non-condensing
Admissible pressure of water circuit 1 MPA
Flow rate: 0- 20 l/min
Fill volume: Approx. 3 l
Noise level: Approx. 73 dB(A); free-standing; distance 1 m
Protection category IP20
Weight: 53 kg
CE Declaration of Conformity
Approvals: UL listed
There is a support rail for attachment inside the VX IT network/server
rack and a condensate discharge hose (3 m) with two 90° connection
brackets included with the supply.

Maintenance: Simple maintenance of the device. The fan assemblies are
easily replaced; the controller slides out in a drawer compartment.