Top Therm LCP Rack / Inline CW

TopTherm LCP Rack CW
TopTherm LCP Inline CW
SK 3311.130/230/260
SK 3311.530/560
Montage-, Installations- und Bedienungsanleitung
Assembly and operating instructions
Notice d’emploi, d’installation et de montage
Montage- en bedieningshandleiding
EN
Foreword
Dear Customer!
Thank you for choosing a Rittal Liquid Cooling Package
(referred to hereafter also as "LCP").
This documentation applies to the following two units in
the LCP series:
– LCP Rack CW
– LCP Inline CW
Those sections where information only applies to one of
the two units are labelled accordingly in the
documentation.
Please take the time to read this documentation
carefully.
Please pay particular attention to the safety instructions
in the text and to Chapter 2 "Safety instructions".
This is the prerequisite for:
– secure assembly of the Liquid Cooling Package
– safe handling and
– the most trouble-free operation possible.
Please keep the complete documentation readily
available so that it is always on hand when needed.
We wish you every success!
Your
Rittal GmbH & Co. KG
Rittal GmbH & Co. KG
Auf dem Stützelberg
35745 Herborn
Germany
Tel.: +49 (0) 27 72/50 5-0
Fax: +49 (0) 27 72/50 5-23 19
E-mail: info@rittal.de
www.rimatrix5.com
www.rimatrix5.de
We are always happy to answer any technical questions
regarding our entire range of products.
2
Rittal Liquid Cooling Package
Contents
1
Notes on documentation .................. 4
1.1
1.2
1.3
1.4
1.5
CE labelling ................................................... 4
Storing the documents .................................. 4
Symbols in these operating instructions ........ 4
Other applicable documents ......................... 4
Normative instructions .................................. 4
1.5.1 Legal information concerning the operating
instructions ........................................................... 4
1.5.2 Copyright ............................................................. 4
1.5.3 Revision ................................................................ 4
2
Safety instructions ............................ 5
2.1
2.2
2.3
Important safety instructions ......................... 5
Service and technical staff ............................ 6
RoHS compliance ......................................... 6
3
Device description ............................ 7
3.1
3.2
General functional description ....................... 7
Air routing ..................................................... 9
6
Installation ...................................... 27
6.1
Connecting the Liquid Cooling Package ..... 27
6.1.1
6.1.2
6.1.3
6.1.4
Electrical connection ..........................................
Cooling water connection ...................................
Connect condensate discharge ..........................
Bleeding the air from the heat exchanger ............
6.2
Cooling operation and control behaviour .... 32
7
Commissioning checklist ................ 33
27
30
31
32
8
Operation ....................................... 36
8.1
Description of operating and display
components ............................................... 36
8.1.1 Hardware of the control unit for the Liquid
Cooling Package ................................................
8.1.2 Hardware of the control unit for the fan module
(RLCP fan) ..........................................................
8.1.3 Hardware of the control unit for the water module
(RLCP water) ......................................................
8.1.4 Hardware for startup current limitation ................
8.2
36
37
38
39
Description of operation ............................. 40
3.2.1 General ................................................................ 9
3.2.2 LCP Rack ............................................................. 9
3.2.3 LCP Inline ........................................................... 10
8.2.1 General .............................................................. 40
8.2.2 Operation in stand-alone mode .......................... 41
8.2.3 Automatic door opening LCP Rack .................... 43
3.3
Equipment assembly ................................... 11
8.3
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
Schematic design ...............................................
Unit components ................................................
Air/water heat exchanger ....................................
Fan module ........................................................
Water module with cold water connection ..........
3.4
3.5
Proper and improper usage ........................ 14
Scope of delivery of a Liquid Cooling
Package ..................................................... 14
Unit-specific instructions ............................. 14
3.6
11
11
13
13
13
3.6.1 Creation of redundancy in the LCP Rack ............ 14
3.6.2 Dewpoint control ................................................ 16
4
Transportation and handling ........... 17
4.1
4.2
Transport .................................................... 17
Unpacking .................................................. 17
5
Assembly and siting ....................... 18
5.1
General ....................................................... 18
5.1.1 Installation requirements ..................................... 18
5.1.2 Prepare installation room for LCP Inline .............. 18
5.1.3 Installation guidelines for LCP Inline .................... 18
5.2
Assembly procedure ................................... 19
5.2.1
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6
5.2.7
General ..............................................................
Dismantle the side panels ...................................
Seal the server enclosure ....................................
Dismantle the server enclosure door ...................
Fit the rear adaptor on the LCP Inline .................
Fit the trim panels if siting without a rear adaptor
Installation and baying of the Liquid Cooling
Package .............................................................
5.2.8 Mounting the side panel .....................................
5.3
19
19
19
21
21
22
22
23
EN
Extended options by connecting the
Basic CMC to a network ............................ 45
8.3.1 Visualisation ....................................................... 45
8.3.2 Backup and transfer of configuration files ........... 59
9
Troubleshooting ............................. 61
10
Inspection and maintenance ........... 63
11
Storage and disposal ...................... 64
12
Technical specifications .................. 65
12.1 30 kW versions .......................................... 65
12.2 60 kW versions .......................................... 66
13
Spare parts .................................... 68
14
Accessories .................................... 69
15
Further technical information ........... 70
15.1 Hydrological information ............................. 70
15.2 Characteristic curves .................................. 71
15.2.1 Cooling output .................................................... 71
15.2.2 Pressure loss ...................................................... 73
15.3 Overview drawings ..................................... 74
15.4 Circuit diagram ........................................... 75
15.5 Water circulation diagram ........................... 76
16
Preparation and maintenance of the
cooling medium .............................. 77
17
Frequently asked questions (FAQ) .. 78
18
Glossary ......................................... 82
Fan installation ............................................ 23
5.3.1 Removing a fan module ...................................... 24
5.3.2 Installing a fan module ........................................ 25
5.4
Install the optional display (SK 3311.030) .... 25
Rittal Liquid Cooling Package
3
1 Notes on documentation
EN
1
Notes on documentation
1.1
CE labelling
Caution!
This warning symbol is used to indicate
procedures which may cause risk of
equipment damage or personal injury.
With the EU declaration of conformity, Rittal GmbH &
Co. KG, the manufacturer, certifies that the cooling units
of the Liquid Cooling Package series are manufactured
and tested in accordance with the following directives:
– EC EMC directive 2004/108/EC
– EC Low Voltage Directive 2006/95/EC
– EN 55022
Information technology equipment – Radio
disturbance characteristics
– EN 60335-1
Safety for household and similar electrical appliances
Part 1: General requirements
– EN 61000-3-2
Electromagnetic compatibility (EMC)
Part 3-2: Limits – Limits for harmonic current
emissions (equipment input current up to and including
16 A per phase)
– EN 61000-6-2
Electromagnetic compatibility (EMC)
Part 6-2: Generic standards – Immunity for industrial
environments
– EN 61000-6-3
Electromagnetic compatibility (EMC)
Part 6-3: Generic standards – Emission standard for
residential, commercial and light-industrial
environments
The cooling unit bears the following mark.
1.2
Storing the documents
The operating and maintenance instructions as well as
all applicable documents are integral components of the
product. They must be handed to those persons who
are engaged with the unit and must always be available
and on hand for operating and maintenance personnel.
1.3
Symbols in these operating instructions
These following symbols are found in this
documentation:
Note:
This instruction symbol indicates information
concerning individual procedures,
explanations, or tips for simplified approaches.
• This symbol indicates an "Action Point“" and shows
that you should carry out an operation/procedure.
1.4
Other applicable documents
In conjunction with these operating and maintenance
instructions, the superordinate system documentation (if
available) also applies.
Rittal GmbH & Co. KG is not responsible for any damage
which may result from failure to comply with these
operating and maintenance instructions. This also
applies to failure to comply with the valid documentation
for accessories used.
1.5
Normative instructions
1.5.1
Legal information concerning the operating
instructions
We reserve the right to make changes in content. Rittal
GmbH & Co. KG is not responsible for mistakes in this
documentation. Liability for indirect damages which
occur through the delivery or use of this documentation
is excluded to the extent allowable by law.
1.5.2 Copyright
The distribution and duplication of this document and
the disclosure and use of its contents are prohibited
unless expressly authorised.
Offenders will be liable for damages. All rights created by
a patent grant or registration of a utility model or design
are reserved.
1.5.3 Revision
Rev. 0B of 15 December 2011
Danger!
This warning symbol is used to indicate
great dangers caused by the product
which may result in injury and even death
if the indicated preventative measures are
not followed.
4
Rittal Liquid Cooling Package
2 Safety instructions
2
Safety instructions
The Liquid Cooling Packages produced by Rittal GmbH
& Co. KG are developed and produced with due regard
to all safety precautions. Nevertheless, the unit still
causes a number of unavoidable dangers and risks. The
safety instructions provide you with an overview of these
dangers and the necessary safety precautions.
In the interest of your safety and the safety of others,
please read these safety instructions carefully before
assembly and commissioning of the Liquid Cooling
Package.
Follow the user information found in these instructions
and on the unit carefully.
2.1
Important safety instructions
Danger! Electric shock!
Contact with live electrical parts may be
lethal.
Before switching on, ensure that it is not
possible to come into contact with live
electrical parts.
Danger! Injury caused by fan impellors!
Keep persons and objects away from the
fan impellors! Do not remove covers until
the power supply is disconnected and
impellors are not moving! Always use
mechanical protection when working!
Shut down the respective fan during
maintenance work, if possible! Tie long
hair back! Do not wear loose clothing!
Fans start up automatically following
power disruptions!
Danger! Cut wounds, especially through
sharp edges of the fan module and heat
exchanger modules!
Put on protective gloves before beginning
assembly or cleaning work!
Caution! Risk of malfunction or damage!
Proper and flawless unit operation can
only be ensured when it is operated under
the intended ambient conditions. As far as
possible, be sure that the ambient
conditions for which the unit is designed
are complied with, e.g. temperature,
humidity, air purity.
Caution! Risk of malfunction or damage!
All media necessary for the control
system, e.g. cooling water, must be
available during the entire operating time.
Caution! Risk of malfunction or damage!
It is vital that the manufacturer's consent
is obtained before adding anti-freeze!
Caution! Risk of malfunction or damage!
During storage and transportation below
freezing point, the water cycle should be
drained completely using compressed air!
Caution! Risk of malfunction or damage!
Only set the temperature control setpoint
as low as is strictly necessary, since the
danger of condensation through
undercutting the dew point increases with
a falling water inlet temperature!
Ensure that the enclosure is sealed on all
sides, particularly at the cable entry
(condensation)!
Danger! Injury due to falling loads!
Do not stand under suspended loads
when transporting the unit with a hoist
trolley, a forklift, or a crane.
Caution! Risk of malfunction or damage!
Do not modify the unit! Use only original
spare parts!
Rittal Liquid Cooling Package
5
EN
2 Safety instructions
2.2
EN
Service and technical staff
The installation, commissioning, maintenance and repair
of this unit may only be carried out by qualified
mechanical and electro-technical trained personnel.
Only properly instructed personnel may carry out service
on a unit while in operation.
2.3
RoHS compliance
The Liquid Cooling Package fulfils the requirements of
EU directive 2002/95/EC on the Restriction of Use of
Certain Hazardous Substances in Electrical and
Electronic Equipment (RoHS) of 13 February, 2003.
Note:
Corresponding information concerning the
RoHS directive is provided by our firm on the
Internet at www.rittal.de/RoHS.
6
Rittal Liquid Cooling Package
3 Device description
3
3.1
Device description
EN
1
General functional description
The Liquid Cooling Package is essentially an air/water
heat exchanger that is used to dissipate high heat losses
from server enclosures or for the effective cooling of
devices built into a server enclosure.
The air routing in the Liquid Cooling Package supports
the "front to back" cooling principle of the devices built
into the server enclosure. The hot air expelled by the
devices in the server enclosure is drawn in by the fans at
the front directly from the server enclosure (LCP Rack)
or from the hot aisle (LCP Inline) and thus routed through
the heat exchanger module.
In the heat exchanger module, the heated air is directed
through an air/water heat exchanger, and its thermal
energy (heat losses from the server) is transferred to a
cold water system. Through this, the air is cooled to a
freely selectable temperature and then routed in front of
the 482.6 mm (19") level in the server enclosure
(LCP Rack) or into the cold aisle (LCP Inline).
2
3
3
4
Fig. 2:
5
1
2
6
3
4
Fig. 1:
Key
1
2
3
4
5
6
Air routing on the LCP Rack – top view
Air inlet
Heat exchanger
Air outlet
Fan module
Second air inlet (optional)
Second air outlet (optional)
Rittal Liquid Cooling Package
Key
1
2
3
4
Air routing on the LCP Inline – top view
Air inlet
Heat exchanger
Air outlet
Fan module
The temperature of the cold air intake is controlled via
constant comparison of the actual temperature with the
setpoint temperature set on the Liquid Cooling Package
control unit (default is +20°C).
If the server-in temperature exceeds the setpoint
temperature, the control valve in the cooling water
system opens, and the heat exchanger is supplied with
cold water. The control valve is infinitely variable (can
open from 0 to 100%).
The temperature differential between the setpoint and
the warm air that is drawn is used to determine and set
the fan speed. The control unit attempts to keep the air
temperature constant in front of the 482.6 mm (19") level
(LCP Rack) or in the cold aisle (LCP Inline) by activating
the control valve.
Any condensate which may develop is collected in the
condensate collecting tray integrated into the water
module of the Liquid Cooling Package.
The collected fluid is drained out of the Liquid Cooling
Package from the tray to outside via the condensate
drain hose.
7
Temperature
3 Device description
5%
10%
15%
20%
20 g/kg
18 g/kg
16 g/kg
14 g/kg
12 g/kg
10 g/kg
8 g/kg
6 g/kg
4 g/kg
2 g/kg
Water
0 g/kg
EN
30%
1.05 kg/m3
40%
40 º
50%
35 º
60%
70%
30 º
80%
1.10 kg/m3
90%
En
tha
lpy
20 º
3
g/m
5k
1.1
10 º
/kg
kJ
40
5º
3
g/m
0k
1.2
0º
/kg
kJ
20
-5 º
3
g/m
5k
1.2
-10 º
/kg
kJ
60
15 º
Rel. Humidity
100%
25 º
g
J/k
0k
-15 º
Mollier h-x diagram for humid air – pressure 0.950 bar (537.000 m / 10.000 °C / 80.000 %rF)
Fig. 3:
8
Mollier h-x diagram for humid air
Rittal Liquid Cooling Package
3 Device description
Note:
The water inlet temperature must always be
selected (controlled) to be above the dew point
for the existing ambient temperature and
humidity in the data centre. The dew point can
be found in the Mollier h-x diagram (Fig. 3).
Furthermore, we advise compliance with the
ASHRAE standard "ASHRAE TC 9.9, 2011
Thermal Guidelines for Data Processing
Environments".
3.2
3.2.2 LCP Rack
The LCP Rack may, as desired, be bayed on the right or
left of a server enclosure.
Air routing
3.2.1 General
In order to achieve sufficient cooling in the server
enclosure, it is important to ensure that the cooling air
passes through the interior of the built-in units and is not
able to flow past at the sides.
Targeted air routing in the server enclosure has a major
effect on the heat loss to be dissipated.
In order to ensure targeted air routing in the system, the
server enclosure is divided vertically into warm air and
cold air sections. The division is accomplished in the
front section of the server assembly to the left and right
of the 482.6 mm (19") level through foam strips, or air
baffle plates which, depending on the enclosure width
and the number of server enclosures to be cooled, can
be ordered as an accessory (see Chapter 14
"Accessories").
Fig. 4:
LCP Rack on a server enclosure
The LCP Rack may also be bayed between two server
enclosures.
If devices which require sideways air throughput are built
into the server enclosure (e.g. switches, router, etc.),
these may be cooled through targeted placement of the
foam strips or air baffle plates.
Note:
The 482.6 mm (19") level must likewise be
completely sealed. This is already the case in a
fully equipped server enclosure. If the server
enclosure is partially equipped, the open
height units (U) of the 482.6 mm (19") level
must be sealed with blanking plates, which are
available from the Rittal accessory range (see
Chapter 14 "Accessories").
As more devices are installed in the server
enclosure, it becomes even more important to
follow this specification.
Rittal Liquid Cooling Package
Fig. 5:
LCP Rack on two server enclosures
Together with the bayed server enclosures, the
LCP Rack forms an airtight cooling system with
horizontal air routing. It places no additional demands on
the room's climate control system.
9
EN
3 Device description
Note:
However, the system does not need to be
completely airtight. This is not necessary due
to the high, coordinated air throughput of the
server and LCP fan.
In fact, a small amount of ambient air is
desirable, since this can prevent the cooling air
from becoming too dry.
EN
3.2.3 LCP Inline
Targeted air routing by hot air extraction from the hot
aisle and cold air blown into the cold aisle has a
fundamental effect on the amount of heat to be
dissipated.
1
Fig. 6:
2
Air routing with a bayed server enclosure – top view
In order to achieve sufficient cooling in the server
enclosure, it is important to ensure that the cooling air
passes through the interior of the built-in units and is
unable to flow past at the sides.
Key
1
LCP Rack
2
Server enclosure
2
Fig. 8:
1
2
2
1
2
Air routing with bayed server enclosures – top view
Key
1
LCP Inline
2
Server enclosure
1
Fig. 7:
2
1
Air routing with two bayed server enclosures – top view
Key
1
Server enclosure
2
LCP Rack
For this purpose, the system consisting of LCP Inline,
server racks and cold aisle containment should be well
sealed in order to avoid a decrease of the cooling
capacity due to mixing of cold and hot air. This ensures
that the cold aisle is sealed via doors at the beginning
and end of the rack rows, and sealed against the ceiling
with roof elements. Existing cable entry glands are
additionally sealed e.g. with suitable brush strips.
In addition, the system consisting of the LCP Rack and
the server enclosure should be sealed as much as
possible in order to prevent a loss of the cooling air. To
accomplish this, the enclosure is equipped with side
panels, roof and gland plates. Any existing cable entries
should be sealed with, e.g. brush strips.
Whilst the system is in operation, both the front and the
rear doors should be kept completely shut.
10
Rittal Liquid Cooling Package
3 Device description
3.3
Equipment assembly
3.3.2
Unit components
EN
3.3.1 Schematic design
The schematic design is illustrated below:
1
2 3
7
6
4
5
13
4
11
5
10
4
4
9
8
6
3
3
Fig. 10: Liquid Cooling Package front – front door open
7
Key
1
2
3
4
5
6
7
8
9
10
11
12
13
2
4
12
Fig. 9:
1
Schematic design of a Liquid Cooling Package –
side view
Fuse box with master switch
Fan PCB
Water PCB
Startup current limitation
Air/water heat exchanger
Water module
Fan 6
Fan 5
Fan 4
Fan 3
Fan 2
Fan 1
Control unit (Basic CMC)
Key
1
2
3
4
5
6
7
LCP door
Optional touch panel (rear)
Levelling foot
Fans (in this instance, four)
Rack
Control unit (Basic CMC)
Fuse box with master switch
The fuse box is comprised of the following components:
• 3-pole master switch
• 3 fuses for the fan modules 1-3
• AC/DC power pack for Basic CMC supply
• I/O connections at the rear
The Liquid Cooling Package consists of a fuse box, a
superordinate control unit (Basic CMC), a fan module, a
water module, a heat exchanger, and six fan modules.
The fan module and the water module contain their own
electronic controls (1 x RLCP fan and 1 x RLCP water),
which are connected to the Basic CMC via an I2C bus.
The fan assemblies are switched on sequentially from
one to six via a startup current limitation once the mains
voltage has been activated.
Rittal Liquid Cooling Package
11
3 Device description
4
EN
1
2
3
Note:
In principle, the rear of the LCP Inline looks
exactly the same as the LCP Rack. However,
it has a perforated door.
The Liquid Cooling Package consists of a solid welded
frame in which the heat exchanger, fan modules, and
the water module are installed.
The frame stands on four levelling feet, which may be
used to align the unit with the bayed server enclosure.
One wide and one narrow wall plate are mounted on
both the left and right sides. A vertical divider plate is
positioned at the joint of the two plates, which separates
the Liquid Cooling Package into warm and cold air
sections.
Fig. 11: Fuse box
Key
1
2
3
4
Miniature circuit-breaker 1 (fan no. 1 and 2)
Miniature circuit-breaker 2 (fan no. 3 and 4)
Miniature circuit-breaker 3 (fan no. 5 and 6)
Master switch
7
6
1
The wide wall plates on right and left sides of the device
form the cold air section together with the divider plate
and the built-in air/water heat exchanger. The wall plates
have been punched with air outlet openings along their
entire length in the front and rear to ensure cold air
supply to the server (LCP Rack) or to the cold aisle
(LCP Inline).
The narrower wall plates close off the rear of the device
and form the warm air section together with the divider
plate. In the LCP Rack, the wall plates have been
punched with air inlet openings along their entire height
and width to ensure the removal of warm air from the
server.
5
Seven shelves are positioned between the wall plates
that divide the front of the Liquid Cooling Package into
several installation spaces of differing heights. The top
shelf supports the power supply unit and/or optionally
the transfer switch, the control unit (Basic CMC), the fan
and water PCB, and the startup current limitation. The
compartments for the fans are below this. All
components of the cooling water supply and
condensate management are integrated into the water
module on the floor of the Liquid Cooling Package.
4
3
2
2
Fig. 12: LCP Rack rear – rear door open
Key
1
2
3
4
5
6
7
12
The front and rear of the Liquid Cooling Package are
each closed with a door with 4-point locking.
In the LCP Rack these doors seal the unit completely. In
the LCP Inline the rear door is perforated to ensure the
dissipation of hot air from the hot aisle.
The optional graphical display (touch panel) for operation
in stand-alone mode is located on the front.
LCP door
Levelling foot
Condensate collecting tray and condensate discharge
Water connection
Air/water heat exchanger
Vent valve
Mains connection, network connection and connection
of optional condensate pump
Rittal Liquid Cooling Package
3 Device description
3.3.3 Air/water heat exchanger
The air/water heat exchanger is installed in the centre
section of the Liquid Cooling Package between both of
the wall plates. In 30 kW units (SK 3311.130/230/530),
the heat exchanger is covered with a spray eliminator on
the air outlet side that catches any occurring
condensate and directs it to the condensate collecting
tray at the bottom of the Liquid Cooling Package.
Three temperature sensors are mounted on the rear of
the spray eliminator at the level of the fan modules. The
sensors record the temperature of the cold air that is
blown in and transfer it to the control unit.
3.3.4
Fan module
8
1
7
2
3
3
2
3
3
3
3
6
4
5
Fig. 13: Fan module in plug-in unit
Key
1
2
3
4
5
6
7
8
Connection cable for graphic display
Mounting bracket
Assembly screws
Connector DC
Earth connection
Connector AC
Fan
Handle
A fan module essentially comprises the fan itself. All fan
modules are controlled by a shared control unit
(RLCP fan). The fans may be operated with linear control
from 0% – 100% (whereby all fans continuously operate
with the same output).
The fan modules are installed on rack-mounted shelves
in the front section of the Liquid Cooling Package.
exchanger in the installed state, enabling the air from the
air/water heat exchanger to be routed directly and
without interruption to the fan module.
Because the individual fan modules are located on
separate angle brackets, it is possible to remove a single
fan module and replace it easily during operation. It
takes about 2 minutes to replace a fan module (see
Chapter 5.3 "Fan installation").
3.3.5 Water module with cold water connection
A significant component of the water module is the
stainless steel condensate collecting tray, on which a
leak sensor and a condensate discharge are located.
In addition to the leak sensor, the condensate tray is also
equipped with a pressureless condensate discharge.
This directs the condensate out of the Liquid Cooling
Package to the rear. The hose must be connected to an
external discharge (see Chapter 6.1.3 "Connect
condensate discharge").
The pipework for the Liquid Cooling Package's cooling
water connection (inlet and return) runs above the
condensate collecting tray.
The lines connect the rear-mounted cooling water
connection with the air/water heat exchanger that is built
into the front of the device. The lines are insulated to
avoid the formation of condensation. A motor-operated
control valve is located in the cooling water inlet line. This
control valve can control the cooling water flow.
The control unit of the water module is fitted in the upper
section, below the power supply to the Liquid Cooling
Package.
The cooling water connection is connected to the main
connections of the cooling water return by two 1½"
externally threaded pipes. The connection nozzles are
positioned horizontally to the rear.
The cooling water connection to the cold water network
can be made by either rigid pipework or flexible hoses,
which are available from the Rittal accessory range
(Model No. SK 3311.040).
The control unit of the fan module is fitted in the upper
section, below the power supply to the Liquid Cooling
Package.
The fan is mounted on top of the support, while the two
connection cables for power supply and the control
cable are mounted underneath the fan. There is a foam
trim panel attached to the air inlet side of the fan, which
connects the fan directly to the unit's air/water heat
Rittal Liquid Cooling Package
13
EN
3 Device description
3.4
EN
Proper and improper usage
The Liquid Cooling Package serves to dissipate high
heat losses and for the effective cooling of devices built
into a server enclosure.
The unit is state of the art and built according to
recognised safety regulations. Nevertheless, improper
use can present a hazard to life and limb of the user or
third parties, or result in possible impairment of the
system and other property.
3.6
Unit-specific instructions
3.6.1 Creation of redundancy in the LCP Rack
It is simple to establish cooling redundancies through
the previously described baying possibilities. The
separation of the server enclosure from the Liquid
Cooling Package makes it possible to achieve differing
levels of redundancy.
1
2
1
The unit should thus only be used properly and in
technically sound condition. Any malfunctions which
impair safety should be rectified immediately! Follow the
operating instructions!
Intended use also includes following the operating
instructions and fulfilling the inspection and maintenance
conditions.
Inappropriate use may result in danger. Inappropriate
use may include:
– Use of impermissible tools.
– Improper use.
– Improper rectification of malfunctions.
– Use of replacement parts which are not authorised by
Rittal GmbH & Co. KG.
3.5
Scope of delivery of a Liquid Cooling
Package
The scope of delivery of a Liquid Cooling Package
includes:
4
3
Fig. 14: Redundant or double cooling with two LCP Racks
Quantity
Parts
1
Liquid Cooling Package, ready for connection
Accessories:
1
1
Condensate hose
1
Vent hose
1
Sealing strip
1
Connector
2
Cable ties and spreading anchors (strain relief
for connection cable)
2
Jumpers for connector
Key
1
2
3
4
LCP Rack
Server enclosure
Inlet cold water system
Return cold water system
Two server enclosures may be cooled with 3
LCP Racks. Depending on the cooling output, the
device bayed in the middle, between the server
enclosures, forms the redundancy for the respective left
and right server enclosure.
Assembly instructions
Tab. 1: Scope of delivery of a Liquid Cooling Package
14
Rittal Liquid Cooling Package
3 Device description
1
2
1
2
1
EN
4
3
Fig. 15: Redundant cooling with three LCP Racks
Key
1
2
3
4
LCP Rack
Server enclosure
Cold water system inlet
Cold water system return
1
2
1
2
1
2
1
2
6
1
5
4
3
Fig. 16: Redundant cooling and double alternating water supply
Key
1
2
3
4
5
6
LCP Rack
Server enclosure
Cold water system inlet 1
Cold water system return 1
Cold water system inlet 2
Cold water system return 2
Rittal Liquid Cooling Package
15
3 Device description
EN
3.6.2 Dewpoint control
There is a dewpoint control installed on the LCP Inline
(SK 3311.530/560) and on the 60 kW version of the
LCP Rack (SK 3311.260).
This form of control depends on the components and
settings of the complete facility and therefore varies from
case to case. If there already is a cooling unit that
controls the air humidity of the room, additional
dewpoint control is not necessary in the majority of
cases, since the existing device already regulates the
humidity according to the recommendations of the
ASHRAE standard "ASHRAE TC 9.9, 2011 Thermal
Guidelines for Data Processing Environments". If the
dew point is to be regulated by the LCP Inline itself, there
are two types of control available with the same
additional scope of installations. First, a humidity sensor
(DK 7320.510) should be installed into the outlet side of
the LCP Inline. It can be mounted easily to the TS 8
frame and be connected without effort to the Basic CMC
of the LCP Inline. The alert triggering range for a
humidity of ≤95% is then set via the included software.
Fig. 17: Humidity sensor settings
The following can be selected from the section
"Combinations" in case of an alarm: either the fans are
switched off (Attention! Cooling capacity is no longer
guaranteed), or the integrated regulating valve is closed,
thereby raising the temperature of the heat exchanger
above the dew point. These solutions may, however,
cause a failure or decrease of the cooling capacity.
The facility must have an independent dew point monitor
if you do not opt for internal control.
In-plant dew point control primarily depends on the way
in which the LCP Inline is supplied with cold water.
Generally, the dew point monitor is to be installed on the
outlet side of the unit. It must be able to raise the inlet
temperature of the water or to switch off the cooling via
a controller.
16
Rittal Liquid Cooling Package
4 Transportation and handling
4
Transportation and handling
4.2
Unpacking
EN
• Remove the unit's packaging materials.
4.1
Transport
The Liquid Cooling Package is delivered shrink-wrapped
on a pallet.
Caution!
Because of its height and small base, the
Liquid Cooling Package is subject to
tipping. Risk of toppling, especially after
the unit is removed from the pallet!
Note:
After unpacking, the packaging materials must
be disposed of in an environmentally friendly
way. They may consist of the following
materials:
Wood, polyethylene film (PE film), strap, edge
protectors.
• Check the unit for damages occurring in transport.
Caution!
Transport of the Liquid Cooling Package
without a pallet:
Use only suitable and technically sound
lifting gear and load-bearing devices with
sufficient load capacity.
Note:
Damage and other faults, e.g. incomplete
delivery, should immediately be reported to the
shipping company and to Rittal GmbH &
Co. KG in writing.
• Place the unit in its intended location.
Rittal Liquid Cooling Package
17
5 Assembly and siting
EN
5
Assembly and siting
5.1
General
5.1.1 Installation requirements
In order to ensure problem-free operation of the Liquid
Cooling Package, the following conditions for the
installation site should be observed:
Supply connections required at the installation site
Type of connection
Connection description:
Power connection:
230 V, 1~, 50/60 Hz
20 A, 1~
400 V, 3~, N, PE, 50/60 Hz with
connection cable DK 7856.025
16 A, 3~, Cekon, 5-pole
Cooling water
connection:
15°C inlet temperature
6 bar permissible operating
pressure
Volumetric flow: depending on
design (see Chapter 15.2
"Characteristic curves")
1½" threaded pipe connection
5.1.2 Prepare installation room for LCP Inline
The installation site of the LCP Inline must be divided
into one cold air zone and one hot air zone. This ensures
that no cooling capacity is lost due to mixing of cold and
hot air.
1
1
2
1
1
3
Tab. 2: Supply connections required at the installation site
Note:
Please see the notes and data regarding the
cold water connection in Chapter 6.1.2
"Cooling water connection" and in
Chapter 15.1 "Hydrological information".
2
Recommendation:
To keep the Liquid Cooling Package easy to
service, maintain a distance of min. 1 m
between the front and rear of the device and
the nearest wall.
Floor conditions
– The floor of the installation space should be rigid and
level.
– Choose the installation site so that the unit is not
situated on a step, unlevel location, etc.
Recommendation:
Room temperature +22°C at 50% relative air
humidity, according to ASHRAE guidelines.
Electromagnetic interference
– Interfering electrical installations (high frequency)
should be avoided.
18
Fig. 18: Installation room with cold aisle containment
Key
1
LCP Inline
2
Hot aisle
3
Cold aisle
Note:
All components required to install suitable
cold aisle containment are available from
Rittal.
5.1.3 Installation guidelines for LCP Inline
The positioning in the rack aisles must be considered in
the layout. The following points are to be considered:
• Heat loss in the adjacent server racks
• Air capacity in the adjacent server racks
• Distances to the adjacent server racks
Rittal Liquid Cooling Package
5 Assembly and siting
Heat losses in the adjacent server racks
If the LCP Inline is used in combination with server racks
with high heat losses, the number of LCP Inline units
must be adapted according to the characteristic curves
(see Chapter 6.2 "Cooling operation and control
behaviour"). The air temperature difference of server inlet
and outlet, which is determined by the equipment used,
is of particular interest. As a rule of thumb, a temperature
difference of 15 K can be expected. There may,
however, be greater differences.
5.2
Air capacity in the adjacent server racks
Due to the containment of the hot and cold zones, it is
important to ensure that the LCP Inline delivers a
sufficient amount of cold air into the cold zone. From
there, the cold air is drawn into the server enclosures
again by the equipment. A small surplus of air should
generally be provided in order to compensate shortterm demands of the equipment.
5.2.2
Distances to the adjacent server racks
The above-mentioned points do not have a major
impact on properties or cooling capacity in small
applications and short aisles if the warm zone is
thoroughly sealed off from the cold zone. For bigger
applications, however, even distribution of the cooling
units should be ensured, due to air capacity loss by
pressure changes and convection or radiation heat of
the equipment. Other factors, such as high temperature
rooms adjacent to the cold zone or exterior walls
warmed by the sun, can also occur.
Assembly procedure
EN
5.2.1 General
Before the Liquid Cooling Package can be bayed onto
the server enclosure, the following work should be
carried out.
– Dismantle the side panels,
– Seal the server enclosure and
– Dismantle the server enclosure door.
Dismantle the side panels
Caution! Risk of injury!
The side panel holders have sharp-edged
teeth, which enable earthing of the server
enclosure's side panel.
If there is a side panel or partition mounted on the server
enclosure side to which the Liquid Cooling Package is to
be bayed, this must be removed first.
• Loosen and remove the 8 assembly screws found on
each side panel of the server enclosure.
• Remove all side panel securing elements from the side
of the server enclosure onto which the Liquid Cooling
Package is to be bayed.
• Dismantle both side panel mountings from the upper
mounting rail of the server enclosure. Use an
appropriate lever to do this.
• Loosen and remove the screws on both of the side
panel mounting brackets (top and bottom) in the
middle of the mounting rail.
• Loosen and remove the screws from the 6 side panel
holders on the side mounting rails.
5.2.3 Seal the server enclosure
In order to ensure targeted air routing in the system, the
server enclosure is vertically divided into warm air and
cold air sections by sealing the 482.6 mm (19") level.
Proceed as follows to seal the 482.6 mm (19") level:
• If the server enclosure is only partially configured, seal
the open sections of the 482.6 mm (19") level using
blanking plates. Screw these tightly into the server rack
from the front side.
Note:
Blanking plates in the various height units (U)
and both narrow and wide foam strips and air
baffle plates are available as Rittal accessories
(see Chapter 14 "Accessories").
• Fasten the broader (Model No. SK 3301.370/
3301.320) of the two foam strips from the LCP Inline
accessories from outside onto one of the front
supports of the server rack (Fig. 19). Make sure to
Rittal Liquid Cooling Package
19
5 Assembly and siting
EN
install this strip on the side of the server enclosure onto
which the LCP Inline is to be bayed.
• If you are only baying the Liquid Cooling Package
on one side: Fasten the narrower (Model No.
SK 3301.380 / 3301.390) of the two foam strips from
the Liquid Cooling Package accessories from outside
onto one of the front supports of the server rack
(Fig. 19). Make sure to install this strip on the side of
the server enclosure which will again be sealed by a
side panel.
Note:
The foam strips can be attached between the
front and rear supports of the server rack along
the entire depth of the devices with air
throughput at the sides (Fig. 20, item 5).
5
5
4
1
2
3
1
2
Fig. 20: Placement of foam strips for devices with sideways air
throughput (top view) – LCP Rack
Fig. 19: Foam strip on a server rack support
Key
1
Foam strip
2
Server rack
If devices which require cooling via sideways air
throughput (e.g. switches, router, etc.) are built into the
server enclosure, cut-outs must be incorporated into the
foam strips.
• To do this, cut out a piece of the foam strip with a
sharp knife.
• If several devices which require sideways air
throughput are included, cut out several pieces of the
foam strip, as is appropriate, so that, ultimately, there
is a cut-out in the foam to the left or right in the height
of each such device in the server rack. Ensure that
there are no gaps on the warm air side of the device
(Fig. 20, item 3).
• Cut additional pieces from the foam strips with a sharp
knife that are at least as long as the height of the builtin devices.
• Attach the foam strips to the cold air side of the
devices facing backward (Fig. 20, item 4). Ensure that
you attach the strips such that all fans built into the
devices can draw air and that none of them are
blocked.
20
Key
1
2
3
4
5
LCP Rack
Server enclosure
Foam strips on warm air side
Foam strips on cold air side
Area in which the foam strips can be positioned
• If there is any remaining length of the foam strip on the
server rack, cut it off at the top edge of the rack.
Note:
The Liquid Cooling Package can, as desired,
be bayed onto a server enclosure with a width
of either 600 mm or 800 mm. For this reason,
the Liquid Cooling Package accessories
include a total of four foam strips or
corresponding air baffle plates with differing
dimensions (see Chapter 14 "Accessories").
• On the side of the server enclosure opposite the Liquid
Cooling Package, mount a side panel on the two side
panel mountings. Align it with the front and rear of the
enclosure.
• Using the 8 assembly screws, screw the side panel
firmly onto the side panel holders and the side panel
mounting brackets.
• Seal off any cable entries which may be present with
corresponding brush strips or similar.
Rittal Liquid Cooling Package
5 Assembly and siting
5.2.4 Dismantle the server enclosure door
Before baying a Liquid Cooling Package, one or both of
the server enclosure doors must be dismantled so that
the attachment points for the baying connectors are
accessible and are not covered by a door edge.
Note:
It is only necessary to dismantle a server
enclosure door when the Liquid Cooling
Package is to be bayed onto a previously
erected server enclosure.
Otherwise, this work is not necessary.
If the Liquid Cooling Package is to be set up
with a new server enclosure, proceed
according to the enclosure's assembly
instructions and bay the Liquid Cooling
Package onto the server enclosure before
assembling the server enclosure doors.
Note:
Support the server enclosure door so that it
will not fall as the door hinges are loosened. If
necessary, work with a second person.
• Remove the server enclosure door (Fig. 21, Step B).
Proceed as follows to dismantle a server enclosure door:
• Remove the sealing bungs from the four door hinges
with an appropriate tool (e.g. screwdriver).
• Release and open the server enclosure door.
• Loosen the hinge pins from the four door hinges by
raising them with an appropriate tool (e.g. screwdriver).
Pull the pins out of the hinge pin holding fixture up to
the catch (Fig. 21, Step A).
Begin with the lowest door hinge.
5.2.5 Fit the rear adaptor on the LCP Inline
In order to achieve an even finish for the LCP Inline and
the server enclosures at the rear, a corresponding
enclosure extension may be installed on the LCP Inline
(see Chapter 14 "Accessories").
• Dismantle the rear door of the LCP Inline in the same
way as the server enclosure (see Chapter 5.2.4
"Dismantle the server enclosure door").
• Dismantle the hinge pin holding fixtures (Fig. 22,
item 1) and corresponding fixing components (Fig. 22,
item 2) from the LCP Inline and reassemble at the rear
of the adaptor in the same way.
1
2
Fig. 22: Assembly components on the Liquid Cooling Package –
rear view
A
1
3
2
B
4
Key
1
Hinge pin holding fixture
2
Fixing component
• Attach the adaptor (Fig. 23, item 2) to the rear opening
of the LCP Inline using four of the supplied screws
(Fig. 23, item 1) each on the left and right.
A
1
Fig. 21: Door hinge – dismantling
Key
1
2
3
4
Door hinges
Hinge pin holding fixture
Hinge joint
Server enclosure door
Rittal Liquid Cooling Package
21
EN
5 Assembly and siting
EN
1
2
Liquid Cooling Package is aligned levelly and that both
enclosures are adjusted to the same height and are
vertically aligned to each other.
• Dismantle the door of the Liquid Cooling Package
whose hinges are on the side on which the server
enclosure is to be bayed. Proceed as described in
Chapter 5.2.4 "Dismantle the server enclosure door".
Note:
If the Liquid Cooling Package is to be bayed
between two server enclosures, both doors of
the Liquid Cooling Package must be
dismantled before the baying connectors are
installed so that the attachment points for the
baying connectors are accessible.
1
3
1
1
Fig. 23: Fit the adaptor on the LCP Inline
Key
1
Assembly screws
2
Adaptor
3
LCP Inline
Attaching the LCP Rack
• Using the corresponding assembly screws, fasten
three baying connectors (Fig. 24, item 2) each onto the
intended attachment points in the mounting strips on
the front and rear of the server enclosure (Fig. 24,
item 1).
1
2
• Fit the door at the rear of the adaptor if you are
securing the LCP Inline to the server enclosure with the
aid of baying clamps.
Note:
If you are securing the LCP Inline to the server
enclosure with the aid of baying clamps, do
not fit the rear door yet.
Fit the trim panels if siting without a rear
adaptor
If no rear adaptor is installed at the rear of the LCP Inline,
with bayed server racks, a gap will appear as a result of
removing the side panels.
• Fit a compensating panel (see Chapter 14
"Accessories") to the server racks in the rear section in
order e.g. to prevent unauthorised access to the server
racks.
2
5.2.6
5.2.7
Installation and baying of the Liquid
Cooling Package
• Position the Liquid Cooling Package on the side of the
server enclosure to which it is to be bayed.
• Pull the LCP Inline forwards until the air outlet holes on
the side of the LCP Inline are completely in front of the
front edge of the server enclosure.
• Align the Liquid Cooling Package with the server
enclosure using the levelling feet. Ensure that the
22
2
Fig. 24: LCP Rack – rear
Key
1
LCP Rack
2
Baying connector
• In the same way, fasten the baying connectors onto
the attachment points provided in the mounting strips
on the front and rear of the server enclosure. As
needed, press the Liquid Cooling Package lightly
against the server enclosure in order to bring the
Rittal Liquid Cooling Package
5 Assembly and siting
baying connectors into alignment with the attachment
points.
Attaching the LCP Inline
• Before baying the LCP Inline, dismantle any partitions
or side panels that may be present on the server
enclosure.
• In the front section, push out a baying clamp (Fig. 25,
item 3) from the server enclosure (Fig. 25, item 2)
through the corresponding notch in the side panel of
the LCP Inline (Fig. 25, item 1).
• From the server enclosure, tighten the baying clamp
(Fig. 25, item 4), so that the frames of the server
enclosure and LCP Inline are firmly connected to one
another.
1
2
3
4
Fig. 25: Baying clamp
Key
1
2
3
4
LCP Inline
Server enclosure
Baying clamp
Assembly screw of baying clamp
• In the same way, insert a second baying clamp to
connect the server enclosure and LCP Inline in the rear
section.
Note:
If the rear frame is fitted on the LCP Inline, it
may alternatively be fitted at the rear between
the frame and the server enclosure, analogous
to the LCP Rack using three baying clamps
(see the section on "Attaching the LCP Rack").
LCP Rack and LCP Inline:
• Where applicable, attach the rear door to the
LCP Rack or to the rear adaptor of the LCP Inline.
• Then, check the stability of the Liquid Cooling Package
once more and adjust the levelling feet if necessary.
Rittal Liquid Cooling Package
5.2.8 Mounting the side panel
If the Liquid Cooling Package is not bayed between two
server enclosures, close it off with a side panel.
Caution! Risk of injury!
The side panel holders have sharp-edged
teeth, which enable earthing of the side
panel through the Liquid Cooling
Package.
Proceed as follows to assemble the side panel:
• Remove the various assembly components from the
optional side panel package (Model. No. SK 8100.235)
or use those from a server enclosure which has already
been dismantled.
• Using the assembly screws, mount the assembly
components (2 side panel mountings, 2 side panel
mounting brackets, 6 side panel holders) onto the side
of the Liquid Cooling Package which is opposite to the
server enclosure.
• Place both side panel mountings as symmetrically as
possible onto the upper mounting rail of the Liquid
Cooling Package and, using your hand, press them
firmly in place.
• Screw down the two side panel mounting brackets
above and below in the middle of the mounting rail
using one screw each.
• Screw down 3 side panel holders onto each of the two
side mounting rails with one screw each.
• Mount a side panel onto the two side panel mountings
of the Liquid Cooling Package and align them to the
front and rear of the unit.
• Using the 8 assembly screws, screw the side panel
firmly onto the side panel holders and the side panel
mounting brackets.
5.3
Fan installation
As delivered, the Liquid Cooling Package contains the
following number of fan modules as standard:
– Version "30 kW" (SK 3311.130/230/530):
One fan module
– Version "60 kW" (SK 3311.260/560):
Four fan modules
Depending on the required cooling output and/or in
order to create redundancy, up to six fan modules in
total may be installed (see Chapter 15.2 "Characteristic
curves").
Note:
If more than three fans are installed in a Liquid
Cooling Package type "30 kW", these are
used to create redundancy or for lower power
consumption by the individual fans. However,
they will not lead to a further increase in the
cooling output.
23
EN
5 Assembly and siting
EN
5.3.1 Removing a fan module
If a fan module is defective, it can be replaced during
operation – quickly and easily.
8
1
Proceed as follows to remove a fan module:
• Open the front door of the Liquid Cooling Package.
• Disconnect the miniature circuit-breaker for the pair of
fans from which one of the fans is to be removed from
the mains.
4
1
2
3
7
2
3
3
2
3
3
3
3
6
4
5
Fig. 27: Fan module in plug-in unit
Key
1
2
3
4
5
6
7
8
Fig. 26: Master switch and miniature circuit-breakers
Key
1
2
3
4
Miniature circuit-breaker 1 (fan no. 1 and 2)
Miniature circuit-breaker 2 (fan no. 3 and 4)
Miniature circuit-breaker 3 (fan no. 5 and 6)
Master switch
Connection cable for graphic display
Mounting bracket
Assembly screws
Connector DC
Earth connection
Connector AC
Fan
Handle
• Remove the two mounting brackets (Fig. 27, item 2).
• Rotate the fan module in the rack by 90° in a clockwise
direction (Fig. 28).
• Should you wish to exchange fan 2 and if the optional
graphics display is installed, please first disconnect the
connection cable connector (Fig. 27, item 1).
• Release the two fan connectors DC and AC on the left
and right (Fig. 27, items 4 and 6).
• Disconnect the earth connection on the fan (Fig. 27,
item 5).
• Loosen the three screws (Fig. 27, item 3) on the fan
mounting brackets on both the left and right.
Fig. 28: Rotated fan module in fan plug-in unit
• Grasp the fan module with both hands on the left and
right, and pull it out of the rack.
24
Rittal Liquid Cooling Package
5 Assembly and siting
5.3.2
5.4
Installing a fan module
Note:
The installation site of individual fan modules
may be varied according to the load.
In its delivered state, all rack mounts not fitted with a fan
are sealed with a metal cover. For units not fully fitted
with fans, these metal covers ensure separation into a
hot and cold air zone inside the device, for targeted air
routing.
Install the optional display (SK 3311.030)
In its delivered state, there is already a suitable opening
provided in the front door of the Liquid Cooling Package
for installing the optional display. This opening is sealed
from the inside by a trim panel.
• Open the front door of the Liquid Cooling Package.
• Loosen the attachments of the trim panel.
• Remove the trim panel to the outside of the door.
• Insert the fixing clamps with screws (Fig. 30, item 2) on
the left and right of the display.
Proceed as follows to install a fan module:
1
• Where applicable, loosen the two assembly screws on
the left and right (Fig. 29, item 1) used to secure the
metal cover in the rack mount.
• Remove the metal cover (Fig. 29, item 2) from the rack
mount.
2
2
3
4
Fig. 30: Preparing the graphic display
1
1
2
1
1
Fig. 29: Metal cover
Key
1
Assembly screws
2
Metal cover
Key
1
2
3
4
Graphic display
Fixing clamps
Connectors for graphic display (4- and 12-pole)
Connection cable
• Insert the connection cable (Fig. 30, item 4) into the
bottom of the display (Fig. 30, item 3).
• Push the display into the cut-out from the outside until
it is in contact with the door (Fig. 31, item 1) of the
Liquid Cooling Package at the front.
• Tighten the two assembly screws (Fig. 31, item 2) from
the inside.
1
• Place the fan module on the shelf rotated through 90°
(Fig. 28) and push it into the rack mount.
• Rotate the fan module through 90° in a counterclockwise direction so that the connection cables are
pointing towards you.
• Secure a metal bracket using three screws each on the
left and right.
• On the left and right, insert one of the fan connectors
into the corresponding socket on the Liquid Cooling
Package.
• Make the earth connection to the fan.
• At the mains power supply or transfer switch, reconnect the miniature circuit-breaker for the pair of
fans of which one fan has been replaced.
• Activate the newly installed fan in the software (see
Fig. 74).
Rittal Liquid Cooling Package
2
2
4
3
Fig. 31: Securing the graphic display
Key
1
2
3
4
Inner view of door, LCP Inline
Assembly screws
Strain relief, connection cable
Connection socket in LCP Inline
25
EN
5 Assembly and siting
EN
• Connect the connection cable of the graphic display to
the corresponding socket in the Liquid Cooling
Package (Fig. 31, item 4).
• Attach the strain relief (Fig. 31, item 3) to the
connection cable to prevent accidental damage to the
cable e.g. when opening the door.
26
Rittal Liquid Cooling Package
6 Installation
6
Installation
6.1
Connecting the Liquid Cooling Package
6.1.1
Electrical connection
General
Note:
Please keep this electrical documentation
readily available so that it is always on hand
when needed. This is the only documentation
which is authoritative for the unit.
Caution!
Work on electrical systems or equipment
may only be carried out by an electrician
or by trained personnel guided and
supervised by an electrician. All work
must be carried out in accordance with
electrical engineering regulations.
The unit may only be connected after the
above-named personnel have read this
information.
Use insulated tools.
The connection regulations of the
appropriate electrical power company are
to be followed.
The voltage values shown in the wiring
plan or on the rating plate must match the
mains voltage.
The pre-fuse specified in the wiring plan
or on the rating plate should be provided
to protect the cable and equipment from
short-circuits. The unit must be
individually fused.
The unit has a high discharge current. For
this reason, it is essential to make an
earth connection before connecting to
the supply circuit.
Caution!
The unit must be connected to the mains
via an isolating device which ensures at
least 3 mm contact opening when
switched off.
No additional control equipment may be
connected upstream of the device at the
supply end.
Power to the Liquid Cooling Package is supplied via
either a separate 3-pole or 5-pole infeed, as desired.
The device is always delivered with a 5-pole mains
connection socket so that the user can attach a
connection cable with a mains plug (3-wire or 5-wire)
depending on the operator's requirements.
Two of the fan modules installed in the Liquid Cooling
Package are on separate phases.
If the Liquid Cooling Package is connected to the mains
using a 3-wire, single-phase, 230 V connection cable (L,
N, PE), one of the phases of this cable must be bridged
to the other two. This is already implemented in the
5-pole plug of this cable.
If the Liquid Cooling Package is connected to the mains
using a 5-wire connection cable (400 V, 3~, N, PE;
DK 7856.025), three separate phases (L1, L2, and L3)
are available.
In this way, if one connection phase fails, four fan
modules will still be supplied with power and the Liquid
Cooling Package will continue to function (redundancy).
Note:
The voltage tolerance must not exceed a
maximum of ±10% of the mains voltage
specified on the rating plate.
Note:
Fusing of the Liquid Cooling Package may be
taken from the technical data on the rating
plate (Chapter 12 "Technical specifications").
Information on the cross-section of the
connection cable may be found in
Chapter 15.4 "Circuit diagram".
Danger!
Take utmost care not to short-circuit one
of the phases with the zero conductor or
the earth conductor. Otherwise, there is a
risk of damage or injury.
Rittal Liquid Cooling Package
27
EN
6 Installation
EN
Electrical connection with the included 5-pole
connector
5-wire, 3-phase connection
To connect the Liquid Cooling Package to the mains
using a 5-wire, 3-phase connection cable, proceed as
follows:
• Remove approximately 45 mm from the rubber cover
of the sheathed flexible cable.
• Trim the neutral conductor (N) and the three phase
conductors (L1, L2, and L3) to a length of
approximately 35 mm. Leave the length of the PE
conductor at approximately 45 mm.
• Remove approximately 9 mm from the insulation of all
conductors with a suitable tool.
Note:
The configuration of the connector may be
found in Chapter 15.4 "Circuit diagram".
• Press the bottom piece of the strain relief housing from
below onto the connector.
• Guide the conductors in the strain relief housing, as
displayed in Fig. 34, and secure the sheathed flexible
cable to the strain relief housing with a cable clamp.
45
1
9
9
2
Fig. 32: Dimensions for removing the rubber cover and insulation
Fig. 34: Connector with strain relief housing
• Attach wire end ferrules without insulating collars to the
ends of the conductors. To crimp the wire end ferrules,
use a suitable crimping tool with an integral lock to
prevent the tool from opening prematurely.
• Connect all conductors to the connector (X-Com plug).
• Insert a screwdriver into an activation opening (Fig. 33,
item 1) and open the screw terminal clamping point of
the conductor entry (Fig. 33, item 2).
• Insert the conductor completely into the conductor
entry and then remove the screwdriver to close the
screw terminal clamping point.
Key
1
Strain relief for conductors with Ø >12 mm
2
Strain relief for conductors with Ø <12 mm
Note:
To provide adequate strain relief for cables
with a diameter of <12 mm as well, it is
necessary to install a second cable clamp
underneath the cable (Fig. 34, item 2).
• Close the strain relief housing by pressing the top
piece of the housing from above onto the bottom piece
(Fig. 35).
1
2
Fig. 33: Connector – rear
Key
1
Activation opening of the screw terminal clamping point
for the conductor entry
2
Conductor entry
28
Fig. 35: Closing the strain relief housing
Rittal Liquid Cooling Package
6 Installation
3-wire, single-phase connection
1
1
Caution!
With a 3-wire, single-phase connection,
the conductor cross-section must be at
least 2.5 mm2.
2
3
4
To connect the Liquid Cooling Package to the mains
using a 3-wire, single-phase connection cable, proceed
as follows:
• Remove approximately 45 mm from the rubber cover
of the sheathed flexible cable.
• Trim the neutral conductor (N) and the phase
conductor (L) to a length of approximately 35 mm.
Leave the length of the PE conductor at approximately
45 mm.
• Remove approximately 9 mm from the insulation of all
conductors with a suitable tool.
Fig. 37: Schematic diagram of the connector with strain relief
housing
Key
1
2
3
4
Bridge for bridging the phase conductors
Phase conductor (L)
Neutral conductor (N)
PE conductor
• To connect the connector, proceed as described in
the section "5-wire, 3-phase connection".
45
3-wire, 2-phase connection (USA)
To connect the Liquid Cooling Package to the mains in
the USA using a 3-wire, 2-phase connection cable,
proceed as follows:
9
9
Fig. 36: Dimensions for removing the rubber cover and insulation
Note:
Example shows German colour code:
blue = neutral conductor N
brown = phase conductor L
yellow/green = PE conductor
• Attach wire end ferrules without insulating collars to the
ends of the conductors. To crimp the wire end ferrules,
use a suitable crimping tool with an integral lock to
prevent the tool from opening prematurely.
• Bypass the phase connections on the connector using
the two included bridges (Fig. 37, item 1). Place one
bridge between phase conductors L1 and L2 and one
bridge between phase conductors L2 and L3.
• Remove approximately 45 mm from the rubber cover
of the sheathed flexible cable.
• Trim both phase conductors (L1 and L2) to a length of
approximately 35 mm. Leave the length of the PE
conductor at approximately 45 mm.
• Remove approximately 9 mm from the insulation of all
conductors with a suitable tool.
45
9
9
Fig. 38: Dimensions for removing the rubber cover and insulation
Note:
Example shows German colour code:
blue = phase conductor L1
brown = phase conductor L2
yellow/green = PE conductor
• Attach wire end ferrules without insulating collars to the
ends of the conductors. To crimp the wire end ferrules,
use a suitable crimping tool with an integral lock to
prevent the tool from opening prematurely.
Rittal Liquid Cooling Package
29
EN
6 Installation
EN
• Bypass the phase connections on the connector using
the two included bridges. Insert the bridges as shown
below (Fig. 39, item 1).
1
1
2
3
4
6.1.2 Cooling water connection
The Liquid Cooling Package is connected to the cold
water network via two 1½" threaded pipe connections
(external thread) on the inlet and return, located on the
lower rear side of the unit. The connection nozzles are
positioned horizontally to the rear. Connection is made
in a downward direction into a raised floor (if available),
or alternatively in an upward direction out of the device.
The dimensions of the mounting openings required for
connection are shown in the overview sketch in
Chapter 15.3 "Overview drawings" (see Fig. 98).
Note:
As much as possible, use flexible hoses for the
cooling water connection (see Chapter 14
"Accessories").
This may be done locally by a suitably qualified
person.
Fig. 39: Schematic diagram of the connector with strain relief
housing
Key
1
2
3
4
Bridge for bridging phase 2
Phase conductor 2
Phase conductor 1
PE conductor
• To connect the connector, proceed as described in
the section "5-wire, 3-phase connection".
Fastening the connection cable
The connection cable must be fastened for the electrical
connection of the Liquid Cooling Package. Proceed as
follows:
2
• Insert the cable tie and spreading anchor from the
accessories into the hole provided on the top of the
Liquid Cooling Package.
• Lay the connection cable and connect it to the
connection socket.
Note:
The following bending radii must not be
exceeded for a fixed installation of the
connection cable.
– 5-wire connection cable: 4 x external
diameter
– 3-wire connection cable: 3 x external
diameter
1
Fig. 40: Cold water network connection:
• Fasten the connection cable with the cable tie.
Key
1
Cooling water return with 1½" external thread
2
Cooling water inlet with 1½" external thread
Caution!
When installing, observe the applicable
specifications concerning water quality
and water pressure.
30
Rittal Liquid Cooling Package
6 Installation
In case of a low water inlet temperature (<12°C), the inlet
and return lines should be appropriately insulated. If this
is not done, condensate may form on the supply lines.
free from iron and manganese, because deposits may
occur which settle in the pipes and block them. At best,
organic substances should only be present in small
quantities, because otherwise sludge deposits and
microbiological contamination may occur.
Note:
Immediately after connecting the water circuit,
the flow rate may be monitored with an
optional touch panel installed. To do this, first
check whether the control valve is completely
open (see Chapter 8.2.2 "Operation in standalone mode"). If the control valve is closed or
only partially open, it can be opened in manual
mode over a network connection using the
setup screen (see Chapter 8.3.1
"Visualisation").
Note:
The Liquid Cooling Package is secured against
excess pressure as regards a maximum
permissible pressure (PS) of 8 bar if no cooling
medium liquid is trapped. If shut-off valves that
could cause cooling medium liquid to become
trapped are installed on site, pressure relief
vessels with safety valves (8 bar blow-off
pressure) must be built into the coolant circuit
of the recooling system.
Note:
The pipework in the building should be
designed according to the Tichelmann
Principle in order to maintain a hydraulically
balanced system.
If this is not the case, the flow volume of each
Liquid Cooling Package must be assured by
using a flow quantity regulator.
Ideally, the Liquid Cooling Package is
connected to the cooling water system using a
water/water heat exchanger.
Advantage:
– Reduction of water volumes in the secondary
circuit,
– setting of a defined water quality,
– setting of a defined input temperature and
– setting of a defined volumetric flow.
Notes on water quality
For safe operation, it is vital that the VBG guidelines on
cooling water are observed (VGB R 455P). Cooling
water must not contain any limescale deposits or loose
debris, and it should have a low level of hardness,
particularly a low level of calcium hardness. For
recooling within the plant, the calcium hardness should
not be too high. On the other hand, however, the water
should not be so soft that it attacks the operating
materials. When recooling the cooling water, the salt
content should not rise too high as the result of
evaporation of large quantities of water, since electrical
conductivity increases as the concentration of dissolved
substances rises, and the water thereby becomes more
corrosive. For this reason, it is not only always necessary
to add a corresponding quantity of fresh water, but also
to remove part of the enriched water. Gypsiferous water
is unsuitable for cooling purposes because it has a
tendency to form boiler scale, which is particularly
difficult to remove. Furthermore, cooling water should be
Rittal Liquid Cooling Package
Note:
Before commencing operation with water, all
supply lines must be adequately flushed.
Note:
To avoid the loss of fluids due to diffusion
(open and closed systems) or evaporation
(open systems), the use of automatic filling is
advisable.
Note:
The 2-way control valve used in the device is
opened at zero current.
6.1.3 Connect condensate discharge
Any condensate which may develop is collected in the
condensate collecting tray (Fig. 41, item 1) in the water
module of the Liquid Cooling Package.
1
2
3
Fig. 41: Condensate discharge
Key
1
Condensate collecting tray
2
Leakage sensor
3
Condensate discharge
31
EN
6 Installation
EN
The Liquid Cooling Package is additionally equipped
with a condensate discharge (Fig. 41, item 3) via which
the condensate is pressurelessly routed out of the Liquid
Cooling Package.
The hose included with the supply (Øint=9.5 mm
Øext=15.5 mm) must be connected to the condensate
discharge. This hose, in turn, must be routed to a drain
with odour seal by the customer, so that cooling fluid
can be discharged from the device in the event of a leak.
Upon reaching a defined condensate level in the
collecting tray, the leakage sensor (Fig. 41, item 2)
triggers a message. The status of the control valve may
be set depending on this "leak message" (Fig. 73).
Note:
In order to ensure safe condensate discharge,
the following points should be observed:
– Lay the drainage hose so that it always runs
downhill and without any kinks.
– Do not constrict the hose cross-section.
Note:
In order to avoid increased condensation and
to reduce energy use, the cooling water
temperature should be adapted to match the
required cooling output.
Note:
Additionally, a condensate pump may be
installed in the Liquid Cooling Package (see
Chapter 14 "Accessories").
1
2
Fig. 42: Bleeding the air from the heat exchanger
Key
1
Ball valve
2
Connector for discharge hose
• Then close the LCP door at the rear.
Note:
The system is usually bled during the course of
commissioning. After bleeding, the ball valve
should be closed again.
6.2
Cooling operation and control behaviour
If the Liquid Cooling Package is supplied with power, the
control valve controls the cooling water flow according
to the established setpoint temperature. For more
detailed explanations, please refer to Chapter 3.1
"General functional description".
Detailed diagrams on cooling output and pressure loss
may be found in Chapter 15.2 "Characteristic curves".
6.1.4 Bleeding the air from the heat exchanger
A vent valve is installed at the uppermost point of the
heat exchanger package in the Liquid Cooling Package.
The unit is delivered with the valve fully closed. However,
the valve must be opened during commissioning.
Proceed as follows:
• Open the rear LCP door.
• Connect the discharge hose included with the
accessories to the top of the vent valve on the
connector (Fig. 42, item 2).
• Route the other end of the hose into a container.
• Open the ball valve (Fig. 42, item 1).
• Close the ball valve again when no further air bubbles
are visible in the collecting container.
The heat exchanger has now been vented.
32
Rittal Liquid Cooling Package
7 Commissioning checklist
7
Commissioning checklist
Rittal GmbH & Co. KG hopes that this checklist will help
its customers and cooperation partners install and
operate the products of the Liquid Cooling Package
family successfully.
Before the installation:
Are shut-off valves installed in the flow and return?
These valves serve to facilitate exchange or
maintenance of the Liquid Cooling Package without
the need to shut off the entire cold water supply.
Is there a Taco-setter installed in the return of each
Liquid Cooling Package?
The Taco-setter ensures a constant volumetric flow
and helps to maintain the hydraulic balance of the
system, especially when operating with other types of
units, such as convectors.
Note:
If the pipework for the Liquid Cooling Package
is carried out according to the Tichelmann
principle, a Taco-setter is not necessary.
Is the water supply properly insulated?
Proper insulation protects against condensate
formation, especially on the parts of the cooling water
flow.
EN
Is there a good water supply available which meets the
quality requirements?
Water quality determines the lasting reliability of the
system. It ensures that no undesirable corrosion or
harmful deposits will occur. The exact manufacturer's
recommendations regarding water quality are found in
Chapter 15.1 "Hydrological information" in the
operating and maintenance instructions of your Liquid
Cooling Package. The recommended water quality
should be ensured even after the installation.
Photo Honeywell
Was the pipework sufficiently flushed before the Liquid
Cooling Package was connected?
It is important to clean or flush the water circuits
appropriately, especially for new installations.
Experience has shown that there are often remnants of
sealants, lubricants, and even metal chips in new
systems, which may lead to a premature failure of the
Liquid Cooling Package. Cleaning the cold water
system carefully before connecting the Liquid Cooling
Package ensures reliable operation later.
Photo Amacell
Are the allowable bend radii of the hoses adhered to?
The hoses must not be kinked too tightly, otherwise
the flow volume may be impaired and the materials
may fatigue prematurely.
Rittal Liquid Cooling Package
33
7 Commissioning checklist
EN
If the water quality of the primary cold water supply is
inadequate, was a separate water circuit with a water/
water heat exchanger installed?
If the cold water supply is strongly contaminated, it
may make sense to install a second, high quality cold
water circuit which is connected to the primary circuit
via a water/water heat exchanger. Even in this case,
the water circuit on the Liquid Cooling Package side
must be carefully cleaned before connecting the
device. Our recommendations regarding water quality
in Chapter 15.1 "Hydrological information" in the
operating and maintenance instructions of your Liquid
Cooling Package apply in this case as well.
Was the water prepared/treated with the appropriate
additives?
In addition to our recommendations regarding water
quality, we recommend that the water be enriched
with corrosion inhibitor and/or antifreeze. Also, a
treatment to prevent algae and biofilms may be
expedient in some cases.
Photo Clariant
Are unused height units in the bayed server enclosures
sealed with vertical blanking plates, and are the side
vertical foam strips installed?
In order to prevent undesired air short circuits and
circulation patterns inside the server enclosure, all
unused height units of the 482.6 mm (19") level should
be closed off with blanking plates. Thus, the air will only
enter the rear side of the server enclosure through the
server itself, where it is drawn off by the Liquid Cooling
Package. The blanking plates are available in various
heights, e.g. Model No. SK 1931.200 for one height
unit. The vertical foam sealing strips installed on each
side of the server enclosure ensure that the cooled air
cannot flow past the 482.6 mm (19") level at the sides.
Sealing strips are available for 2 applications and 2
enclosure widths. The respective model numbers are
found in Chapter 14 "Accessories" in the operating
and maintenance instructions of your Liquid Cooling
Package.
34
Are all electrical, water, and power connections correctly
made?
Before water is admitted, and, ideally before the ball
valves are opened, be sure to check that all
connections are properly made. Take particular care to
ensure that all quick release fasteners are fully
snapped into place.
Is the TS/PS server enclosure equipped with suitable
doors?
The LCP Rack operates with closed air circuits. Thus,
the cooled server enclosure must largely be
hermetically sealed and equipped with unperforated
sheet steel or glass doors on the front and rear.
Exception when using the LCP Inline:
In this case, both the front / front door and the rear /
rear door of the server enclosure must have
unrestricted air permeability.
After admitting cold water:
Are all parts and connections water tight?
Please check to be sure that all parts and connections
which carry water are water tight. The Liquid Cooling
Package is subject to an individual, comprehensive
factory test, which also includes checking for leaks.
This additional check serves to locate problems, such
as possible transport damage, and to prevent greater
damage.
Venting of the Liquid Cooling Package
In order to ensure even water circulation through the
circuit and effective heat transfer, the Liquid Cooling
Package must be vented during commissioning.
Rittal Liquid Cooling Package
7 Commissioning checklist
After installation:
We recommend that the following selected parameters
be gathered and documented within a short time after
installation.
– Inlet temperature
– Return temperature
– Volumetric flow with opened 2-way control valve
EN
Note:
Documenting these parameters helps with
error analysis in case malfunctions occur
during operation.
Please feel free to contact Rittal if you have further
questions or problems:
For malfunctions and repairs
Rittal Service Department
Tel.: +49 (0) 27 72/50 5-18 55
E-mail: RSI@Rittal-Service.com
Rittal Liquid Cooling Package
35
8 Operation
EN
8
Operation
8.1
Description of operating and display
components
Hardware of the control unit for the
Liquid Cooling Package
A Basic CMC forms the control unit of the Liquid Cooling
Package. Its job is to use the I2C bus to poll the
measurements (such as the three server-in
temperatures, three server-out temperatures, six fan
speeds, flow rate, control valve position, inlet and return
temperatures of the cooling water) from the control unit
of the fan modules, the sensors on the heat exchanger,
and from the control unit of the water module, to perform
control functions, and to transfer the setpoints (such as
the fan speed) to the individual units.
C
IOIOI
!
CMC - TC
Basic CMC
8.1.1
1
2
3
4
Fig. 43: Control unit Liquid Cooling Package (Basic CMC) – front
Key
1
2
3
4
Button "C"
Status LED (alarms and warnings)
Status LED (network status)
Serial interface for communication, e.g. via hyperterminal
The control circuit board is built into a standard CMC
plastic housing. The following components are on the
front side of the unit:
Control components
Explanation
Button "C"
Use this button to confirm warnings and alarms.
Status LED
(alarms and warnings)
Displays the internal status of the control unit through a duo LED.
Red: Alarm
Yellow: Warning
Flashing red/yellow/green: Configuration change
Green: Other
Status LED
(network status)
Displays the status of the network connection. The status LED flashes when the unit is polled by the
network via the Ethernet interface. The colour (green or yellow) indicates the network speed.
Various sockets are found on the rear of the control unit.
Power
2
4
1
3
1
2
P-I C
24 VDC
max. 2,5A
1
IOIOI
2
3
4
5
6
Fig. 44: Control unit Liquid Cooling Package (Basic CMC) – rear
Key
1
2
3
4
5
6
36
Sockets for additional sensors
I2C socket (X22)
Socket for controlling the graphical display (X24)
Alarm relay socket
Network connection (X23)
Power supply (X21)
Pin assignment of the sockets for additional sensors:
1
24 V DC
2
GND
3
Sensor ID 1
4
Sensor ID 2
5
Analog input
6
Digital input/output
The 8-pole connector X225 contains the so-called
Power-I2C bus.
Assignment of the I2C bus:
1
N/C
2
N/C
3
N/C
4
N/C
5
GND
6
24 V DC
7
P-SDA
8
P-SCL
Rittal Liquid Cooling Package
8 Operation
The optional graphical display on the front door is
controlled via an RS-232 connection with the RJ12
socket X24.
8.1.2
7 8 7
X24 pin assignment:
1
24 V DC
2
GND
3
TxD
4
RxD
5
RTS
6
CTS
X23 pin assignment:
1
Tx+
2
Tx3
Rx+
4
N/C
5
N/C
6
Rx7
N/C
8
N/C
Power supply pin assignment:
1
24 V DC
2
GND
3
N/C
The control unit is supplied with power via a separate
power pack (DK 7320.425) and a Kycon socket. All
modules are supplied with 24 V DC and are fed together
with the I2C bus.
8
3
4
EN
5
1
2
Alarm relay socket pin assignment:
1
24 V DC
2
GND
3
N/C
4
Relay normally closed
5
Relay common
6
Relay normally open
Connection to an optional network is via an Ethernet
connection using the RJ 45 socket X23 or the
corresponding socket in the rear, upper section of the
Liquid Cooling Package.
Hardware of the control unit for the fan
module (RLCP fan)
9
9
6
9
9
2
1
4
5
3
Fig. 45: Control unit fan module – rear/top view
Key
1
2
3
4
5
6
7
8
9
Control Interface socket (X1) – RJ45
Control Interface socket (X2) – RJ45
Temperature sensors, cold air socket (X3) – 8-pole
Temperature sensors, hot air socket (X4) – 6-pole
Fan setpoint sockets (X5) – 24-pole
Debugger
LED yellow (2x)
LED green (2x)
Earth (4x)
All fan modules are activated jointly by one control unit
(RLCP fan). The control voltage is +24 V and is fed
together with the I2C bus through connectors X1 or X2
of the control unit (Basic CMC).
X1/X2 pin assignment:
1
CAN 1/2 high
2
CAN 1/2 low
3
+24 V
4
GND
5
GND
6
+24 V
7
SDA – I2C
8
SCL – I2C
The fans are equipped with linear control. All fans run
with the same speed and are connected to the control
unit (RLCP fan) via a 24-wire cable using a connector.
The fans are equipped with a Hall sensor, which reports
the speed signal to the control unit (socket X5).
Rittal Liquid Cooling Package
37
8 Operation
EN
X5 pin assignment:
1
SET_1 setpoint fan 1
2
10 V from fan 1
3
SET_2 setpoint fan 2
4
10 V from fan 2
5
SET_3 setpoint fan 3
6
10 V from fan 3
7
SET_4 setpoint fan 4
8
10 V from fan 4
9
SET_5 setpoint fan 5
10 10 V from fan 5
11 SET_6 setpoint fan 6
12 10 V from fan 6
13 SPD_1 actual value, fan 1
14 GND fan 1
15 SPD_1 actual value, fan 2
16 GND fan 2
17 SPD_3 actual value, fan 3
18 GND fan 3
19 SPD_4 actual value, fan 4
20 GND fan 4
21 SPD_5 actual value, fan 5
22 GND fan 5
23 SPD_6 actual value, fan 6
24 GND fan 6
Furthermore, the control unit has two sockets (X3 and
X4) for connecting temperature sensors. One of these
sensors is inside the fan module and one is on the rear
of the heat exchanger. The air temperature in front of the
fans (that is, the temperature of the cold air supplied to
the server enclosure, X3) and the temperature behind
the heat exchanger (that is, the temperature of the air
drawn in from the server enclosure, X4) are measured.
X3 pin assignment:
1
GND temperature sensor 1 cold air
2
GND temperature sensor 2 cold air
3
GND temperature sensor 3 cold air
4
Free
5
Temperature sensor 1 cold air
6
Temperature sensor 2 cold air
7
Temperature sensor 3 cold air
8
Free
X4 pin assignment:
1
GND temperature sensor 1 hot air
2
GND temperature sensor 2 hot air
3
GND temperature sensor 3 hot air
4
Temperature sensor 1 hot air
5
Temperature sensor 2 hot air
6
Temperature sensor 3 hot air
The fan set speed determined by the control unit is
evaluated and the appropriate fan speed is set on the
fans.
8.1.3
Hardware of the control unit for the water
module (RLCP water)
6 7 6
7
3
4
1
2
8
8
5
8
8
2
1
3
4
Fig. 46: Control unit water module – rear/top view
Key
1
2
3
4
5
6
7
8
Control Interface socket (X1) – RJ45
Control Interface socket (X2) – RJ45
Condensate pump controller socket – 6-pole
Sensors and actuators socket – 24-pole
Debugger
LED yellow (2x)
LED green (2x)
Earth (4x)
The water unit also contains a control unit (RLCP water).
The control voltage is +24 V and is fed together with the
I2C bus through connectors X1 or X2 of the control unit
(Basic CMC).
X1/X2 pin assignment:
1
CAN 1/2 high
2
CAN 1/2 low
3
+24 V
4
GND
5
GND
6
+24 V
7
SDA – I2C
8
SCL – I2C
The control unit's software continuously reads the
analog values from the temperature sensors via the
analog channel and establishes an average value for
each sensor. Next, it reads the temperature value in °C
from a table and writes this in the I2C transmission buffer.
Furthermore, the software counts the speed pulses of
the connected fans and also writes this into the I2C
transmission buffer.
38
Rittal Liquid Cooling Package
8 Operation
A condensate pump may optionally be connected to
socket X3.
8.1.4
Hardware for startup current limitation
4
X3 pin assignment:
1
GND
2
GND
3
GND
4
+24V
5
Condensate pump output
6
Addressing input I2C
3
1
EN
2
The sensors and actuators are connected to socket X4
via a 24-wire cable.
X4 pin assignment:
1
Temperature sensor, water inlet
2
Temperature sensor, water return
3
GND flow sensor
4
TxD flow sensor
5
GND optional flow meter
6
Output from flow meter
7
GND leakage sensor
8
+5 V leakage sensor
9
GND condensate sensor
10 +5 V condensate sensor
11 GND control valve
12 Input 0-10 V control valve
13 Temperature sensor, water inlet
14 Temperature sensor, water return
15 RxD flow sensor
16 +5 V flow sensor
17 Output from flow meter
18 +24 V DF
19 Heating function, leakage sensor
20 Optosensor, leakage sensor
21 Heating function, condensate sensor
22 Optosensor, condensate sensor
23 Output 0-10 V control valve
24 +24 V supply, control valve
The water module's software continuously reads the
analog values from the two temperature sensors for the
inlet and return of the cooling water system via the
analog channel of the CPU and establishes an average
value for each sensor. Next, it reads the temperature
value in °C from a table and writes this in the I2C
transmission buffer.
Furthermore, the software counts the pulses from the
flow meter, reads the leakage sensor and the digital
input, and also writes these values to the I2C
transmission buffer. The position (opened/closed) of the
2-way control valve is determined by the control unit.
Rittal Liquid Cooling Package
5
5
4
3
5
2
1
Fig. 47: Startup current limitation – rear/top view
Key
1
2
3
4
5
Terminals for infeed AC (X5) – 5-pole
Socket for fan 1, 2 (X1) – 8-pole
Socket for fan 3, 4 (X2) – 8-pole
Socket for fan 5, 6 (X3) – 8-pole
Earthing (3x)
The startup current limiter is supplied with voltage via
terminal strip X5
X5 pin assignment:
1
Phase conductor L1 (1~ L1)
2
Phase conductor L2 (1~ L1')
3
Phase conductor L3 (1~ L1")
4
Neutral conductor N
5
PE conductor
The fans are supplied with voltage in pairs via sockets X1
(fans 1 and 2), X2 (fans 3 and 4) and X3 (fans 5 and 6).
Assignment of X1 / X2 / X3:
1
PE Fan
2
PE
3
PE
4
PE Fan
5
Neutral conductor fan
6
Phase fan
7
Neutral conductor fan
8
Phase fan
39
8 Operation
8.2
Description of operation
EN
8.2.1 General
A Basic CMC forms the control unit of the Liquid Cooling
Package. Its jobs are to:
– Retrieve all measurements via the I2C bus from the fan
modules and the water module (temperatures,
speeds, flowrates, etc.).
– Evaluate all measurements and generate alarm and
warning signals.
– Calculate the thermal output of the inlet and return
temperature as well as determine the water flow
volume.
– Control air temperature in the server enclosure by
regulating the fan speed and the water volume through
the heat exchanger.
– Set the setpoint temperature for the cold air blown in
(factory setting 20°C).
– Control an optional graphical display (touch panel) via
a RS-232 interface.
– Display the measurements and settings of parameters
and setpoints via the web interface of the CMC.
– Poll the sensor and setting values over SNMP.
Note:
Further explanations concerning the various
setting options and features are available in the
Basic CMC system documentation.
The control unit cyclically polls all measurements from
the connected fan modules and water module. This
communication takes place via the I2C bus. The control
unit thus serves as the master and polls the
measurements from the slave units and returns the
setting data to them.
The measurements supplied by the individual modules
are evaluated by the control unit and possible warning
and alarm signals are generated. If a new warning or
alarm occurs, the internal beeper communicates this. At
the same time, the alarm relay is switched. This acoustic
alarm may be cleared by pressing down the clear button
"C" briefly. The exact cause of malfunction can be
displayed in plain text on the connected optional
graphical display (touch panel). The following messages
can be displayed:
Warning messages
– Speed of fan 1 faulty
– Speed of fan 2 faulty
– Speed of fan 3 faulty
– Speed of fan 4 faulty
– Speed of fan 5 faulty
– Speed of fan 6 faulty
– Flow faulty
– Control valve faulty
40
Alarm messages
– Temperature sensor 1 (server-in/server-out
temperature) faulty
– Temperature sensor 2 (server-in/server-out
temperature) faulty
– Temperature sensor 3 (server-in/server-out
temperature) faulty
– Inlet temperature sensor faulty
– Return temperature sensor faulty
– Water module not present
– Leakage message
– No fan module detected
Note:
After turning on for the first time or after repair
work, it is possible that the Liquid Cooling
Package will operate in emergency operation
mode.
In order to switch the unit to normal operation
(control operation), press down the "C"
button (Fig. 43, item 1) once quickly.
Note:
In emergency operation, cooling of the
device is ensured even with malfunctions
inside the unit. All fans will then operate at
100% output, and the control valve will open
completely.
Design of the temperature control circuit
The actual temperature values of the cold air on the air
input side (server-in temperature) supplied by the three
temperature sensors on the heat exchanger are used to
control the air which is blown into the server enclosure.
The average value is determined from the actual
temperature values. The control unit constantly
compares this (average) actual temperature with the
setpoint temperature. If the setpoint temperature is
exceeded, the control unit attempts to maintain a
constant temperature by opening and closing the
control valve. Only when the actual temperature falls
below the value of "setpoint temperature" is the control
valve kept closed, i.e. no cold water flows through the
heat exchanger. Additionally, the necessary fan speed is
determined and controlled by determining the
temperature difference between the inlet and the outlet
air (server-out temperature / also, in this case, an
average value is determined via the fan modules.) The
respective setpoint speed for the fans and the setting of
the control valve is sent to the connected control units
via the I2C bus.
Four additional standard sensors can be connected to
the control unit (Basic CMC) to monitor additional
physical parameters of the Liquid Cooling Package. The
sensors must simply be connected to one of the four
Rittal Liquid Cooling Package
8 Operation
sockets on the rear of the control unit (Fig. 44, item 1)
and configured via the Basic CMC.
The following standard sensors can be connected in
addition:
Sensor
Model No.
DK
Max.
quantity
Temperature sensor
7320.500
4
Humidity sensor
7320.510
4
Analog sensor input
module "4 – 20 mA"
7320.520
4
Access sensor
7320.530
4x5
Vandalism sensor
7320.540
4
Airflow sensor
7320.550
4
Smoke alarm
7320.560
4
Motion sensor
7320.570
4
Digital input module
7320.580
4
Digital relay output
module
7320.590
4
Voltage monitor
7320.600
4
Voltage monitor with
switch output
7320.610
2
Voltage monitor
7320.611
4
48 V voltage monitor
7320.620
4
Leakage sensor
7320.630
4
Leakage sensor cable
7320.631
4
Acoustic sensor
7320.640
4
Door control unit
7320.790
4
8.2.2 Operation in stand-alone mode
In stand-alone mode, the Liquid Cooling Package can
be operated via the touch panel of the optional graphical
display on the front door. The touch panel may be
ordered as an accessory (see Chapter 14
"Accessories").
Fig. 48: Graphical display
Tab. 3: List of standard sensors
The user interface of the touch panel allows the user to
navigate between the individual menu options of the
Liquid Cooling Package controller using softwarecontrolled buttons.
Fig. 49: Screen page "Home"
On the main screen, the mean of the 3 server-in
temperatures of the sensors on the heat exchanger is
displayed, together with the current cooling capacity.
Depending on the current status of the Liquid Cooling
Package, warnings (see Fig. 50) and alarm messages
(see Fig. 51) may also be output here. Details of pending
messages may be viewed on the screen page "Alarm
list" (see Fig. 59).
Rittal Liquid Cooling Package
41
EN
8 Operation
EN
Fig. 50: Screen page "Home" with warning message
Fig. 53: Screen page "Water-Info"
The following information is displayed on the screen
page "Water-Info"
– Cooling water flow rate in l/min
– Actual setting of control valve
– Water inlet and return temperature in °C
Fig. 51: Screen page "Home" with alarm message
Fig. 54: Screen page "Air-Info"
The following information is displayed on the screen
page "Air-Info"
– 3 x server-out temperature of sensors
– 3 x server-in temperature of sensors
Fig. 52: Screen page "Details"
The following information is displayed on the screen
page "Details"
– 3 x server-out temperature of sensors
– 3 x server-in temperature of sensors
– Speed of individual fan modules
– Water inlet and return temperature in °C
– Actual setting of control valve
– Cooling water flow rate in l/min
Fig. 55: Screen page "Settings"
The following selection options are available on the
screen page "Settings":
– Door opening (with installed option "Automatic door
opening")
– Setpoint
By selecting one of the points, a new screen page will
open.
42
Rittal Liquid Cooling Package
8 Operation
EN
Fig. 56: Screen page "Doors"
Fig. 58: Screen page "Info"
The number of door exits that are defined is shown on
the "Doors" screen page. By selecting an entry, e.g.
"Door 1", the door magnets on this door output are
deactivated for 10 seconds and the door opens. Once
this period has expired, the magnet is re-energised.
On the screen page "Info", detailed information such as
version numbers of the Liquid Cooling Package is
displayed.
By pressing the "Alarm List" key, the screen page "Alarm
List" will appear. Here, all pending alarm messages are
displayed in plain language.
Fig. 57: Screen page "Setpoint"
Fig. 59: Screen page "Alarm list"
On the screen page "Setpoint", you can define the
setpoint for the server-in temperature.
• Increase the displayed value by pressing the "+" key,
or reduce it by pressing the "–" key.
• Confirm the value by pressing the "" key.
• If you do not wish to accept the change, press the ""
key.
Note:
The input mode for the setpoint for the serverin temperature can be locked to prevent
access by unauthorised personnel. Further
information on this may be found in
Chapter 8.3 "Extended options by connecting
the Basic CMC to a network".
Note:
Connect the Basic CMC to a network for
extended setting options (see Chapter 8.3
"Extended options by connecting the Basic
CMC to a network").
8.2.3 Automatic door opening LCP Rack
In conjunction with the LCP cooling systems, the
automatic door-opening feature can be a wise choice
under certain conditions. With this feature, the doors of
the systems are kept closed under normal
circumstances and are opened, if necessary, by a
mechanism.
Possible reasons for use:
Fire extinguishing
Whole-room fire extinguishing systems are already
installed in many existing data centres. However, when
rack-based, high-density cooling is used in closed
enclosures, the extinguishing gas cannot penetrate into
the inside of the rack in the event of a fire. If the doors
are automatically opened when needed, the
extinguishing gas can flow into the enclosure.
Rittal Liquid Cooling Package
43
8 Operation
EN
Emergency cooling
In principle, redundancy with respect to the cooling can
be achieved with the alternating installation of LCPs and
racks (see Fig. 15). If this type of installation is not
possible, the internal temperature of the enclosure can
rise considerably within a short period of time, e.g. if the
cooling water supply fails (e.g. at a power dissipation of
15 kW, the temperature will rise from 22°C to 32°C in
approx. 90 seconds). However, the rise in the air intake
temperature depends greatly on how leak-tight the
server rack is.
Emergency cooling can be achieved by the automatic
door opening feature. However, the installation location
must have adequate air conditioning.
The automatic door opening feature can be effected in
several ways, as follows:
used for emergency cooling, even higher power
dissipation in the server rack can be dissipated.
With this method, the escape route is only blocked at the
back of the server rack. Unauthorised access, is
however, possible through the open rear door. The
separate partition between the cooling system and the
rack is eliminated.
Solid front door (glass/sheet steel) in conjunction
with a solid rear door (glass/sheet steel) of the
server rack
Perforated server rack front door in conjunction with
a glass or sheet steel enclosure rear door
If the need arises, only the rear door of the enclosure is
automatically opened. The air flows into the interior of
the enclosure via the perforated front door, circulates
around the installed equipment and exits the system via
the open rear door of the enclosure. It is important to
ensure that the LCP fans are switched off, otherwise hot
air will be blasted in front of the 482.6 mm (19") level in
the event of emergency cooling.
If this method is used, whether for fire extinguishing
purposes or for emergency cooling purposes, the
installation location must be air-conditioned (ASHRAE
conditions, 22°C, 50% rel. humidity). If this method is
44
If the need arises, both the front and the rear door are
automatically opened. The air flows unhindered into the
interior of the enclosure, circulates around the installed
equipment and exits the system via the open rear door
of the enclosure. It is important to ensure that the LCP
fans are switched off, otherwise hot air will be blasted in
front of the 482.6 mm (19") level in the event of
emergency cooling.
If this method is used, whether for fire extinguishing
purposes or for emergency cooling purposes, the
installation location must be air-conditioned (ASHRAE
conditions, 22°C, 50% rel. humidity).
If this method is used for emergency cooling, even
higher power dissipation in the server rack can be
dissipated.
With this method, the escape route is blocked at both
the front and back of the server rack. Unauthorised
access is possible through the open front and rear
doors. The separate partition between the cooling
system and the rack is eliminated.
Rittal Liquid Cooling Package
8 Operation
If the system used is equipped with an automatic door
opening feature, the latter must be activated via the LCP
software. The necessary settings are explained from
page 43 on.
The following values can be edited in the browser
window of the Basic CMC software and then sent to the
control unit.
– Set temperature
(setpoint used by the control unit to regulate)
8.3
In the Liquid Cooling Package, the network connection
for the Basic CMC is routed to a jack in the upper rear
area of the device. To connect to a network, this jack
should be connected to a free jack on a network access
using a Category 5 patch cable.
Extended options by connecting the
Basic CMC to a network
By connecting the Liquid Cooling Package control unit
(Basic CMC) to a network, you are able to call up various
measurements and warning or alarm messages. These
may then be further processed (e.g. via a Web browser,
SNMP, etc.). Furthermore, various values can be set via
the network and then sent to the control unit. If the
control unit is connected to a network, the status LED
(Fig. 43, item 3) flashes when the unit is polled by the
network via the Ethernet interface.
The following values can be called up and processed via
the network in the browser window of the Basic CMC
software:
– Server-in temperature
(actual temperature)
– Server-out temperature
(hot air temperature; temperature measured behind
the heat exchanger)
– Water-in temperature
(values supplied by the heat exchanger module for the
water inlet temperature)
– Water-out temperature
(values supplied by the heat exchanger module for the
water return temperature)
– Water flow
(values supplied by the heat exchanger module for the
water flow rate in l/min)
– Cooling capacity
(calculated thermal output which is removed from the
server enclosure)
– Setpoint
(set target value)
– Operating mode
(set operating mode either "auto" or "manual")
– Fan speed
(fan speed e.g. 20%)
– Control valve
(the actual value for the control valve setting is
displayed here)
– Leakage alarm
(alarm indicating whether a leak is present)
8.3.1 Visualisation
The examples below explain how to set and change the
values supplied by the Liquid Cooling Package control
unit.
Note:
This documentation refers to the Basic CMC
software with the provisional version 6.42.
Further explanations concerning the operation
and various setting options and features are
available in the separate Basic CMC
documentation.
Firmware updates for the LCP software are
available under www.rimatrix5.com.
Note:
This chapter contains a visualisation of the
LCP Rack by way of an example. For those
areas where there are deviations from the
LCP Inline, the modified/additional parameters
are described accordingly.
Login page
Fig. 60: Login page of the Basic CMC
Fig. 60 shows the login page of the Basic CMC. A user
with admin rights and up to 16 users with restricted
rights can log in to the system here.
Rittal Liquid Cooling Package
45
EN
8 Operation
Status screen
EN
LCP overview
The following values are displayed in the LCP overview
area:
1
2
3
Fig. 61: Status screen of a Liquid Cooling Package
Key
1
Information display
2
Status window
3
Navigation display
Fig. 61 shows the status screen of the browser window
of a Liquid Cooling Package. The screen is divided into
three areas.
At the left edge of the screen, under the Rittal logo, there
is a navigation display which shows the current screen
menu. The number and timing of the most recent alarms
and warnings are also displayed here in the left-hand
window.
The header of the screen contains an information
display. This contains details of the connected units
(Name/Liquid Cooling Package), the location of the unit
(Location), and the responsible contact person
(Contact).
Positioned underneath, in the middle of the status
screen, is the status window, which is divided into four
windows.
1
2
3
Settings
Explanation
Server-in
temperature
Displays the average of the three server-in
temperatures from the fan modules.
Serverout temperature
Displays the average of the three server-out
temperatures from the fan modules.
Water-in
temperature
Displays the water supply temperature.
Waterout temperature
Displays the water return temperature.
Water
flow
Displays the flow of the cooling medium, as
also shown in the graphic overview.
Cooling
capacity
Displays the calculated cooling output of the
Liquid Cooling Package. The output is
calculated from the inlet and return
temperatures as well as from the flow values of
the cooling water circuit (the value is calculated
over approximately one to two minutes).
Setpoint
Displays the current setpoint for the server-in
temperature. This setpoint is used to control
the server-in temperature using the flow
volume of the control valve.
Operating mode
Displays the current operating mode
(Automatic, Manual or Combination (Combi.))
in which the Liquid Cooling Package is
operating.
Fan
speed
Displays the currently set fan speed in %:
0% = fan off
100% = maximum speed
Control
valve
Displays the current setpoint for the position of
the control valve in %:
0% = valve closed,
100% = valve open.
Leakage
alarm
Status of the leakage sensor.
4
Fig. 62: Status window
Key
1
2
3
4
46
LCP overview
Graphical overview
Sensors
Status line
Tab. 4: Displays in the LCP overview display area
All displayed texts are provided as links, which refer you
to the setup page of the respective sensor value.
Rittal Liquid Cooling Package
8 Operation
Graphical overview
The following values are displayed in the graphical
overview in an illustrated depiction of the Liquid Cooling
Package:
Settings
Explanation
Server-in
temperature (3x)
Displays the actual temperature and the status
of each temperature sensor on the cold air
side of the Liquid Cooling Package.
The temperatures are displayed in real values
in °C. The status of the temperature sensors is
represented by the following colours:
green = sensor o.k.
red = sensor defective
Serverout temperature
(3x)
Displays the actual temperature and the status
of each temperature sensor on the warm air
side of the Liquid Cooling Package.
The temperatures are displayed in real values
in °C. The status of the temperature sensors is
represented by the following colours:
green = sensor o.k.
red = sensor defective
Fan
speed
(6x)
Displays the actual speed and the status of
each fan.
The temperatures are displayed in real values
in rpm. The status of the temperature sensors
is represented by the following colours:
green = sensor o.k.
orange = speed less than 400 rpm (with the
fans operational).
The arrangement and the numbering of the
fans on the screen is equivalent to the real
arrangement and numbering in the Liquid
Cooling Package (fan 1, top/fan 6, bottom).
Flow rate
Displays the actual flow rate of the cooling
medium in real values in l/min.
The status of the temperature sensors is
represented by the following colours:
green = sensor o.k.
orange = sensor defective
Control
valve
Displays the actual value for the position of the
control valve in %:
0% = valve closed,
100% = valve open.
Water
temperature (2x)
Displays the actual temperature and the status
of the temperature sensor at the cooling water
inlet and return.
The temperatures are displayed in real values
in °C. The status of the temperature sensors is
represented by the following colours:
green = sensor o.k.
red = sensor defective
Tab. 5: Measurements and display values in the graphical
overview
Sensors
Four additional standard sensors can be connected to
the control unit (Basic CMC) to monitor additional
physical parameters of the Liquid Cooling Package. The
status of these sensors is displayed in this window.
Status line
The status line displays whether or not the unit is
functioning correctly or if a warning or alarm message is
present. The following displays are possible:
– No alarm (green background)
– Warning (orange background)
– Alarm (red background)
– Configuration changed (status line flashes between
red and orange)
1
Fig. 63: Status screen with warning message
Key
1
Warning message
A warning message is displayed in the status line of the
status window in Fig. 63.
1
Fig. 64: Status screen with alarm message
Key
1
Alarm message
An alarm message is displayed in the status line of the
status window in Fig. 64. In this case, the server-out
temperature has exceeded the upper limit.
You can acknowledge alarm and warning messages as
well as the message "Configuration Changed" by
Rittal Liquid Cooling Package
47
EN
8 Operation
EN
pressing the "Clear" button. Acknowledgement of
warning and alarm messages is only possible with the
"Manual Reset" setting (Fig. 65 Alarm reset to "Manual").
You can refresh the overview diagram and sensor
readings in the right-hand section of the window by
pressing the "Refresh" button.
Settings
Explanation
Setpoint
high
This setpoint may be used to generate and
forward an alarm message in case of
overheating (temperature sensor).
Setpoint
warning
This setpoint may be used to generate and
forward a warning message if limits are
exceeded.
Setpoint
low
This setpoint may be used to generate and
forward an alarm message in case of
overcooling (temperature sensor).
Alarm
delay
Used to set a delay time of between 0 and
999 seconds. Any warnings or alarms that
occur are only activated with the set delay
time. Alarms or warnings which are shorter
than the duration set here will not be displayed
or logged. The status change to "OK" occurs
immediately, independently of the value set
here.
Alarm
relay
Used to switch the Basic CMC alarm relay on
and off.
Alarm
beeper
Used to switch the Basic CMC acoustic alarm
on and off.
Alarm
reset
Determine whether activated alarms should be
automatically deleted, or whether manual
confirmation (with the "Clear" button or using
the "C" key on the Basic CMC) is required.
Trap
receiver
Choice as to which receiver a trap is sent when
status is changed.
Scheduled
alarm off
This point may be used to determine that no
alarm should be reported for one or more
timers. The time for the timer must be set in the
timer menu.
Send
e-mail
Select the recipients to whom an e-mail is to
be sent if the status changes. The numbers of
the respective e-mail addresses are linked to
each other with the character "&".
Setup screen
Fig. 65: Setup screen for the server-in temperature
Fig. 65 shows the setup screen of the Liquid Cooling
Package. The left edge of the screen and the header are
not shown, because their layout is the same as that on
the status screen.
The values which have to be set are shown on the setup
screen and can be input there.
Beneath the setup window there are also two buttons,
"Accept" and "Reset". These are used to either accept
or reject the modified settings.
– The "Accept" button is used to accept the changed
values.
– The "Reset" button is used to clear the changed
values.
Tab. 6:
Setup values for the server-in temperature
Fig. 65 shows the setup screen for the server-in
temperature. Either the following values are displayed or
the following settings may be changed in this screen:
Settings
Explanation
Unit
name
Name of the Liquid Cooling Package unit
(max. 10 characters)
Type
Message type
Sensor
status
Temperature and status of the message are
displayed in colour.
Message
Text message which appears in the status
window (may be edited)
48
Rittal Liquid Cooling Package
8 Operation
The settings for the following components are made on
the tab panels 2 through 5:
EN
– Tab panel 2: Server-out temperature
– Tab panel 3: Cooling water inlet temperature
– Tab panel 4: Cooling water return temperature
– Tab panel 5: Flow of the cooling medium
Note:
The flow limits on tab panel 5 should be set to
the value that the system can supply at the
maximum flow rate.
The reactions of the Liquid Cooling Package to warning
and alarm messages from the respective components
are set on tab panels 6 through 11.
– Tab panel 6: Fans. The fans are monitored for a
minimum speed of approx. 400 rpm.
– Tab panel 7: Air temperature sensor. The sensors are
monitored for a viable temperature of between 0°C
and 80°C.
– Tab panel 8: Water temperature sensor. The sensors
are monitored for a viable temperature of between 0°C
and 60°C.
– Tab panel 9: System warning. System warnings
indicate a flow meter failure and a faulty control valve.
– Tab panel 10: Hardware module fault. Module faults
relate to a non-identified fan assembly and a nonidentified water assembly.
– Tab panel 11: Leakage alarm.
Fig. 66: Setup screen for cooling output and server-in
temperature
Fig. 66 shows the setup screen for the cooling capacity
display value. This shows how much cooling output is
being delivered by the recooling systems to the system
at the moment.
The setpoint for the server-in temperature may be
changed in the lower part of the window.
A password must be entered to call up the three setup
screens for the operating data (tabs 13–15). This is done
on a separate login screen. Furthermore, the logged-in
user must have administrator rights.
Note:
Tab panels 2 through 11 have the same layout
as tab panel 1. Only a few parameters are
missing. Therefore, a repeat, detailed
description is not given here again.
Fig. 67: Input password
Rittal Liquid Cooling Package
49
8 Operation
Note:
Password: RittalLcp+XXXXX
The five-digit number at the end of the
password (XXXXX) is the serial number of the
Basic CMC (see table 12 "General settings for
Liquid Cooling Package").
Access to the setup screens is only possible
with full access rights. This must be set up via
the hyperterminal in the Basic CMC of the unit.
Refer to the operating manual for the Basic
CMC for more detailed information.
EN
Settings
Explanation
Combination
status
Displays the status of the combination.
Operating mode
Selection of the Liquid Cooling Package
operating mode. Here, automatic mode is
selected. The additional settings in manual
mode are explained in Tab. 9.
Automatic
mode
Pull-down menu for setting the control of the
fans and the control valve of the Liquid Cooling
Package.
Caution!
Only disclose the password to authorised
personnel.
The setup mode is only used for service
purpose. Setting up of basic operating
parameters should only be carried out by
Rittal service personnel.
Fig. 69: Setting options
Full:
In this mode, the fan speed and the position of
the control valve are controlled automatically.
Fan only:
In this mode, only the fan speed is controlled
automatically. The position of the control valve
can be set to a fixed position using the function
for manual operation. This position is saved
and used again after the system is restarted.
Valve only:
In this mode, only the position of the control
valve is controlled automatically. The fan
speed can be set to a fixed speed using the
function for manual operation. This speed is
saved and used again after the system is
restarted.
If no changes are entered or confirmed in the login
window for more than 10 minutes, the password is reset
and it must be entered again to call up the setup window
for operation data.
Combinations
Call up the "Combinations" screen for setting
the links of the sensor feedbacks for control of
the fans.
Fig. 68: Setup screen 1 for operation parameters –
"Automatic Mode"
Fig. 68 shows the setup screen 1 for the operating
parameters of the Liquid Cooling Package for the
functions in automatic mode.
The following are parameters that are displayed or
settings that may be made on this screen:
50
Rittal Liquid Cooling Package
8 Operation
Settings
Explanation
Fan
control
mode
Pull-down menu for setting the calculation
mode for automatic control of the fan speeds.
The required fan speed for automatic control is
determined from the difference of the serverout temperature and the setpoint for the
server-in temperature (dT = server-out
temperature – setpoint server-in temperature)
and controlled linearly.
The following modes can be selected:
EN
Fig. 71: Display after calling up the setup screen "Combinations"
Fig. 70: Setting options
average temperature:
In this mode, the average value of the serverout temperatures is used to calculate the
required fan speed.
maximum temperature:
In this mode, the highest value of the serverout temperatures is used to calculate the
required fan speed.
In addition, the automatic control of the fan
speeds can be controlled using the values dT
[min. fan speed] and dT [max. fan speed].
dT
[min. fan
speed]
The fans operate at the lowest fan speed
beneath this temperature difference.
dT
[max. fan
speed]
The fans operate at the highest fan speed
above this temperature difference.
Min. fan
speed
Minimum fan speed. In automatic mode, the
fans will always run at this set speed as
minimum.
This page is used to set the required responses of the
fan and the control valve if the conditions of the
"Combinations" are met.
To this end, the status of four sensors can be linked
together. Both of these groups can then also be linked
again with "and/or" (Fig. 71). The rules of "Boolean
Algebra" should be taken into account when making
such links.
The following selection options are available for the
response of the fans and the control valve:
Tab. 7: Operating parameters 1 for automatic mode
Rittal Liquid Cooling Package
51
8 Operation
Display
Fan response
Control valve response
1
Fans off & valve to 100%
Fans are deactivated.
Valve is opened to 100%.
2
Fans to full speed & valve to 100%
Fans are switched to highest speed
(100%).
Valve is opened to 100%.
3
Fans off & valve to minimum
Fans are deactivated.
Valve is closed to minimum level.
4
Fans to full speed & valve to minimum
Fans are switched to highest speed
(100%).
Valve is closed to minimum level.
5
Fans off & valve to automatic
Fans are deactivated.
Fan control remains active.
6
Fans to full speed & valve to automatic
Fans are switched to highest speed
(100%).
Fan control remains active.
7
Fans to automatic & valve to 100%
Fan control remains active.
Valve is opened to 100%.
8
Fans to automatic & valve to minimum
Fan control remains active.
Valve is closed to minimum level.
EN
Tab. 8: Selection options for response of the fans and control valve
Caution!
If one of the two settings is chosen as
"valve to automatic" (no. 5 or no. 6), the
setting for the "Automatic Mode" must be
set to "Full" or "Valve Only" in order for
valve control to continue to work.
If one of the two settings is chosen as
"fans to automatic" (no. 7 or no. 8), the
setting for the "Automatic Mode" must be
set to "Full" or "Fan Only" in order for fan
control to continue to work.
Fig. 72 shows the setup screen for the operating
parameters of the Liquid Cooling Package for the
functions in manual mode.
The following are parameters that are displayed or
settings that may be made on this screen in addition to
the functions in automatic mode:
Settings
Explanation
Operating mode
Selection of the Liquid Cooling Package
operating mode. Here, manual mode is
selected.
Fan
speed
Fan speed setting (0% = off / 100% =
maximum speed).
The last setting that was made is saved and
used again after the system is restarted if the
setting "Valve only" is selected in automatic
mode. Otherwise, the fan modules are
controlled automatically.
Enable
fans
Switch off individual fan modules for testing.
This function is only possible in manual mode.
In automatic mode, all fan modules are
activated.
Valve
Setting of the opening position of the control
valve. This is set as a percentage [%] between
0 and 100%.
The last setting that was made is saved and
used again after the system is restarted if the
setting "Fan only" is selected in automatic
mode. Otherwise, the control valve is
controlled automatically.
Tab. 9: Operating parameters for manual mode
Fig. 72: Setup screen 1 for operating parameters – "Manual
Mode"
Note:
After the Liquid Cooling Package is connected
to the mains or restarted, the controller is
always in automatic mode.
52
Rittal Liquid Cooling Package
8 Operation
Settings
Explanation
Valve
min.
value
Continuous opening of the control valve may
be set here within the range of 0 to 50%
(default value: 0%).
This minimal valve setting is only active in
"Automatic Mode"; the valve can still be
manually closed to 0%. Similarly, in the event
of a malfunction (e.g. leakage), depending on
the setting, the valve is either closed
completely ("close valve") or an alarm message
is output ("alarm message only") (Fig. 73).
This setting guarantees a minimum flow at all
times, whereby the control can react more
spontaneously to sudden capacity increases.
Leakage
mode
This sets the required response of the control
valve in the event of a leakage:
Emergency Mode:
The valve closes completely in the event of a
leakage.
Only Alarm Message:
Only an alarm message is sent in the event of
a leakage. The Liquid Cooling Package
continues controlling in the previously set
mode.
Setpoint
by display
Enable options for the setpoint entry of the
server-in temperature using the graphical
display (touch panel) of the Liquid Cooling
Package:
Enable:
Setpoint entry is possible.
Disable:
Setpoint entry is locked.
Open by
display
Activation or deactivation of door opening on
the touch panel (optional).
Measurement
interval
A log file "lcp_plus.csv" is stored in the
download directory, in which measurements
such as temperatures, setpoints, valve setting,
output etc. are stored. The maximum number
of entries is 1024; thereafter, "old" entries are
overwritten. The interval between two entries
may be set here at between 10...600 s. The
display also shows which time frame is
covered by the time interval set here with the
1024 entries in the log file.
Fig. 73: Setup screen 2 for the operating parameters
Fig. 73 shows the setup screen 2 for the operating
parameters of the Liquid Cooling Package for the
functions in automatic mode.
The following are parameters that are displayed or
settings that may be made on this screen:
Settings
Explanation
Sampling
time
Setting of the control interval for the control
valve. In this interval, the actual temperature
(average from the temperature sensors of the
server-out temperature) is compared with the
setpoint (server-in temperature).
This is set in seconds [s] between 10 and 60 s
(preset to 20 s).
PID
components
Cw value
Values for setting the PID control algorithm
integrated in the LCP software. The following
settings can be made here:
P amount:
Parameter for setting the proportional amount.
This is set as a percentage [%] between 1 and
30% (preset to 10%).
I amount:
Parameter for setting the integral amount. This
is set in seconds [s] between 20 and 150 s
(preset to 80 s).
D amount:
Parameter for setting the differential amount.
This is set in amount per second [1/s] between
0 and 50/s (preset to 0/s).
Specific thermal capacity of the cooling liquid
used.
Rittal Liquid Cooling Package
EN
Tab. 10: Operating parameters 2 for automatic mode
Caution!
The preset values of the parameters
"Sampling Time" and "PID Components"
were calculated based on a series of
experiments, and should only be changed
for good reason, to improve the control
performance.
53
8 Operation
Note:
For components that have been disabled, the
values are displayed highlighted in grey on the
overview page (Fig. 75). Components that
have been disabled also no longer deliver
warning and/or alarm messages. For these
components, no more setpoints can be
entered, simulations can also no longer be
carried out. The cooling capacity can also only
be calculated when the water temperature
sensors and flow meter are available and
active.
EN
Fig. 74: Setup screen 3 for the hardware options
Fig. 74 shows setup screen 3 for setting the hardware
options of the Liquid Cooling Package.
The following are parameters that are displayed or
settings that may be made on this screen:
Settings
Explanation
LCP type
The Liquid Cooling Package is preset in the
factory. This setting must not be altered.
Water
sensors
Flow
meter
Control
valve
Condensation
pump
"Disable Water Sensors" indicates the removal
of the temperature sensors for water inlet and
return from the visualisation. Consquently,
"Disable Flow Meter" and "Disable Control
Valve" indicate the removal of the flow meter
and control valve. If there are customerspecific control components connected
upstream of the Liquid Cooling Package, the
water sensors for inlet and return, the flow
meter and the control valve must be physically
removed from the unit. Otherwise, the internal
control components will continue to be
regulated.
If the optional condensate pump is installed in
the Liquid Cooling Package, the setting
"Enable Condensation Pump" will enable the
"Cycles Condensation Pump" display to be
flashed up in the visualisation. With the setting
"Disable Condensation Pump", this display is
masked out, but the condensate pump
continues to be activated. As standard, there
is no condensate pump installed in the Liquid
Cooling Package.
Installed
fans
Fig. 75: Status screen after disconnection of the components of
the water module
Fig. 76: Setup screen "General Setup"
Following the installation of one or more fans,
these fans need to be activated here.
Allocation of the numbers 1-6 to the installation
location can be viewed on the status screen
(see Fig. 62).
Tab. 11: Settings for the hardware options
54
Rittal Liquid Cooling Package
8 Operation
The setup screen "General Setup" is depicted in Fig. 76.
All general settings for the Liquid Cooling Package are
made here:
Settings
Explanation
Name
Name of the Liquid Cooling Package unit
(max. 40 characters)
Location
Location of the Liquid Cooling Package unit
(max. 40 characters)
Contact
Responsible contact person
(max. 40 characters)
Revision
Revisions and serial numbers of the Liquid
Cooling Package unit
SW: Software revision
HW: Hardware revision
SN: Serial number
Temperature unit
Default setting for the unit of temperature.
The following settings are possible:
Degrees Celsius [°C]
Degrees Fahrenheit [°F]
Measurement
unit
Default setting for the unit of flow.
The following settings are possible:
Litres per minute [l/min]
Gallons per minute [US-Gallons/min]
With SNMP transmission, the value is only
displayed in l/min.
Beeper
Used to switch the Basic CMC alarm beeper
on and off.
Quit
alarm
relay
Here, you can set whether the alarm relay can
be acknowledged using the C key on the
Basic CMC.
Language
Used to change the language of the screen
pages in the browser window (German and
English).
Alarm
relay
options
Used to set the switching position that
generates an alarm message. The following
settings are possible:
Open: Message is generated when the relay
opens.
Close: Message is generated when the relay
closes.
Off: The relay does not switch, and therefore
no message is generated.
Web
access
Background
colour
Display of network access to the Liquid
Cooling Package, as set via Telnet or via the
serial interface. The following displays are
possible:
Full: Full access
View only: read only access
No Access: access prohibited
Settings
Explanation
Actual
date
Current date
Actual
time
Current time
EN
Tab. 12: General settings for Liquid Cooling Package
Fig. 77: Setup screen "Setup eMail (SMTP)"
Fig. 77 shows the setup screen for "Setup eMail
(SMTP)". All settings for sending e-mails via the CMC are
made here:
Settings
Explanation
IP SMTP
server
IP address of a mail server.
SMTP
authent.
If authentication is necessary at the mail
server, activate the option "Yes" here. Then
enter the appropriate data in the fields
"Username Server" and "Password Server".
Sender
name
Sender name of the Liquid Cooling Package or
Basic CMC for outgoing e-mails.
Reply to
Reply address for e-mail replies.
Unit
messages
Activation or deactivation of e-mail sending in
the event of faults at a unit.
E-mail
address
1–4
Input of up to 4 addresses to which the e-mails
are to be sent. Which of these destination
addresses are to be contacted in the event of
a fault can be selected on the tab panels for
the individual sensor settings.
Tab. 13: Settings for sending e-mails
Used to set the background colour of the
screen pages in the browser window.
Rittal Liquid Cooling Package
55
8 Operation
EN
Fig. 78: Setup screen "Setup Timer"
The setup screen "Setup Timer" is depicted in Fig. 78.
Here, all settings for eight timers may be made on the
eight tab panels.
Settings
Explanation
Timer
control
Activate (enable) or deactivate (disable) timer
control.
Day of
week
Select the day of the week. Here, you can
choose between the individual days of the
week, the days "Saturday and Sunday",
"Monday to Friday" and "Monday to Sunday".
Time
interval
Input the time interval for which the timer
remains active.
Timer
function
Select the required timer function to be
triggered at the specified time. Choose
between the following four groups:
Disable Trap Receiver X
Alarm Scheduler X
Disable E-Mail Receiver X
Status E-Mail to Receiver X
The individual Alarm Schedulers may be
activated and deactivated on the respective
tab panels of the individual sensors (Tab. 6).
Timer
status
Display the timer status.
Tab. 14: Settings for the timers
56
Fig. 79: Setup screen "Setup Server Shutdown"
The setup screen "Setup Server-Shutdown" is depicted
in Fig. 79. All settings for the selective shutdown of
servers may be made here. To this end, combinations
may be set with up to four input conditions.
Note:
As a general rule, the setting of combinations
for shutting down servers is similar to the
approach used when setting the combinations
for fan control.
In the lower part of the screen page, you define the
individual servers (up to 10) which are to be shut down if
the conditions of Group 1 and/or Group 2 are met. To
this end, a shutdown client (RCCMD licence) must be
installed on the respective server. The licence may be
ordered under Rittal item number 7857.421.
The "Test Ping" button is used to test whether the
respective server for which the "Enable" checkbox has
been selected is physically present and switched on.
Rittal Liquid Cooling Package
8 Operation
Note:
The overview of event messages will only
appear if the user is logged in as "admin". If
not, the message "Access denied!" will appear
in the window.
Fig. 80: Navigation bar when there are alarms/warnings present
Fig. 82 shows an overview of the times when each user
logged in or logged out. Here again, a total of 150
messages may be stored.
By pressing the "Delete" button, the list of messages
and the corresponding log file (event.log) are deleted
completely.
By pressing the "Refresh" button, the page with the log
entries is updated and refreshed.
Via the navigation bar on the left-hand edge of the
screen, the pages with the alarm messages and event
messages may be retrieved.
Fig. 81: Alarm messages
Fig. 81 shows the last alarm messages; up to a total of
150 messages may be stored. The individual alarms and
warning messages are differentiated based on their
cause (e.g. water-out temperature, failure flow meter,
etc.). For quicker differentiation, the entries are also
highlighted in colour:
– Red: Alarm messages
– Orange: Warning messages
– Green: OK messages
– Blue: Information messages
The "Delete" button is only visible if a user with admin
rights is logged in. By pressing this button, the list of
alarm messages and the corresponding log files
(alarm.csv, alarm.history) are deleted completely.
Fig. 82: Event messages
Rittal Liquid Cooling Package
Fig. 83: "User administration" screen if the user logged in as
"admin"
Fig. 83 shows the "User administration" screen if the
user is logged in as "admin". Settings for up to 16 users
can be made on tab panels 1 through 16.
Settings
Explanation
User
name
User name (min. 3 characters). The stated user
name cannot be retrospectively altered. To do
so, the user must first be deleted (save without
entry) and then re-created.
Password
User password (min. 3 characters). The
password must be entered a second time in
the field "Retype".
Unit 1
(Sensors)
Access right for the sensor values of the Basic
CMC.
Unit 2
(LCP ...)
Access right for the sensor values of the Liquid
Cooling Package.
General
setup
Timer
functions
SMTP
setup
Access rights for the setup settings.
Alarm
logs
Access rights for the various alarm log areas.
57
EN
8 Operation
EN
Settings
Explanation
Timeout
Time after which the user is automatically
logged out when there has been no activity.
Login
status
Here, the administrator can see which user is
logged in.
Tab. 15: User settings
Fig. 86: "Alarm Simulation Menu" screen
Fig. 84: "User administration" screen if the user is not logged in
as "admin"
Fig. 84 shows the "User administration" screen if the
user is not logged in as "admin". The user can change
his password here.
Fig. 86 shows the "Alarm Simulation Menu" screen.
Individual alarms and warnings can be simulated here.
For messages requiring limits to be entered, the
following options are available for selection: "Too Low",
"Warning" and "Too High". When the appropriate
"Simulation" button is then pressed, the respective
alarm or warning is activated for 5 seconds. After that,
the status is automatically reset to OK or to the original
state.
Note:
Only one simulation can run at a time in the
"Alarm Simulation Menu".
Note:
When the simulation is activated, all system
reactions that are stored for the respective
fault (alarm relay, beeper, traps, e-mail) are
initiated. Any combinations entered for a
controller or actuator (if connected) are also
executed.
Fig. 85: "User administration" screen, "Admin" tab panel
Fig. 85 shows the "User administration" screen with the
"Admin" tab panel in the foreground. Settings for the
administrator can be made on this tab panel. In contrast
to the other users, only the user name, password and
time for automatic log-out appear here.
In addition, the administrator can also call in the socalled Alarm Simulation from this tab panel.
58
Rittal Liquid Cooling Package
8 Operation
If the output is already switched off when the warning
value is reached, this reaction is reset when the actual
value reaches the alarm value!
The same settings are made for the output 1/2
accordingly.
8.3.2 Backup and transfer of configuration files
With this function, the configuration of the Basic CMC
can be backed up and then restored onto the system at
a later time, if necessary.
In addition, the configuration can be transferred to other
Basic CMC systems that are wired and set up in exactly
the same way.
Note:
Caution, this function may only be used when
the CMC-TC systems are exactly the same
with respect to:
– The sensor types or ports that are used
– The sensor units or the ports and addresses
that are used
– Software versions
No sensors or sensor units must be missing or
in the wrong position.
If this is not heeded, the configuration of the
Basic CMC will not be accepted.
Fig. 87: "Setup Sensors" screen
Fig. 87 shows the "Setup Sensors" screen with the "1"
tab panel in the foreground. Here, a "Door Magnet"
sensor is connected at sensor port 1. Depending on the
type of sensor connected, the input options on the
individual tab panels may vary from one another.
By activating the "Combinations" button, you can carry
out additional actions for the activated sensor
dependent on the status of other sensors.
Back up configuration file
After initial start-up and installation have been
completed and all texts, limits, links, network settings
etc. are finalised, the information can be backed up to an
external system (network PC).
The Download directory in the Basic CMC may be
accessed via the FTP or SFTP protocol.
In this directory, the following three files can be loaded
and saved to a network PC:
cmc.cfg
(non-editable) system data
cmc.user
(non-editable) user administration data
net.cfg
(editable) network settings
Fig. 88: Setup screen for the output "Door Magnet"
Fig. 88 shows the screen for setting the links for the
output 1/1 (Door Magnet). Specifically, the two sensor
signals for the server-in temperature and the status of
the water sensors are linked here (Group 1). The leakage
alarm is also checked (Group 2). Correspondingly, the
output module is wired in such a way that in this
particular example, the flow of electricity is interrupted
and the magnets are therefore deactivated if either the
conditions of group 1 or the conditions of group 2 are
met. In this case, the front door will open.
If output is to be switched, e.g. in the event of excess
temperature, it is advisable to always use the alarm value
(Too high) for this purpose.
Rittal Liquid Cooling Package
Note:
Caution, when editing the file "net.cfg", the
format or the file layout must not be changed
under any circumstances.
Failure to comply with this instruction can lead
to complete system failure.
59
EN
8 Operation
EN
Transfer of the configuration file
Condition:
The three configuration files have previously been saved/
backed up.
The Upload directory in the Basic CMC may be
accessed via the FTP or SFTP protocol.
Configuration files that are transferred to the destination
unit:
cmc.cfg
(non-editable) system data
cmc.user
(non-editable) user administration data
net.cfg
(editable) network settings
The event log shows whether the individual configuration
files have been correctly transferred.
Fig. 89: Messages following the successful transfer of
configuration files
60
Rittal Liquid Cooling Package
9 Troubleshooting
9
Troubleshooting
EN
Malfunction
location
Malfunction
Cause of malfunction
Effect
Remedy
Control valve
The
Basic CMC
displays flow
even though
the control
valve is
displayed as
closed
The control valve is dirty
The flow meter displays a
value. There is a ΔT.
Use the Basic CMC to open
and close the control valve
several times; contaminants
may be loosened.
It is highly recommended
that a filter be installed in the
system to ensure the
required water quality.
Flow meter
The
Basic CMC
displays no
flow even
though the
control valve
is displayed
as open
Flow meter is dirty
The flow meter displays no
value, even though the
control valve is open and
there is a ΔT.
The flow meter must be
removed and cleaned or
replaced by authorised
personnel. It is highly
recommended that a filter be
installed in the system to
ensure the required water
quality.
Electronics/
Software
The
electronics/
software do
not respond
The system is hung up, e.g.
through loose connection or
incorrect operation
No response, display and
control via the Basic CMC
do not work correctly.
Disconnect power to the
complete Liquid Cooling
Package and restart. Also
disconnect any existing
network connections by
removing the control unit
network connector from the
Basic CMC of the Liquid
Cooling Package.
Liquid Cooling
Package
The Liquid
Cooling
Package is
not regulating
temperature
and is
operating in
emergency
mode
After a power supply
interruption or upon first
installation, the Liquid
Cooling Package may
operate in emergency mode
because of an alarm, e.g.
because there is no water
pressure
The 2-way control valve is
open and the fans operate
at full speed.
Press the "C" button on the
Liquid Cooling Package
control unit for approx.
2 seconds. The system will
then enter regulating mode if
all is properly connected and
the unit is supplied with
electricity and cold water.
The unit is not
providing the
required
cooling
output
Air in the system
If there is air in the system,
the water cannot circulate
properly in the heat
exchanger. Thus, it cannot
remove heat.
Bleeding the air from the
heat exchanger
Increased pressure loss on
the piping network side, e.g.
through a clogged filter or
incorrectly set flow limiter
The external pumps are
not able to pump enough
cold water through the
Liquid Cooling Package.
Clean the filter, set the flow
limiter correctly.
Air routing not correct
The cooled air passes
through unsealed
openings past the
equipment to the back of
the enclosure.
Unused height units in the
482.6 mm (19") level as well
as side slots and openings
must be sealed using
blanking plates or foam
strips. Both are available as
accessories.
Rittal Liquid Cooling Package
61
9 Troubleshooting
EN
In order to prevent malfunctions caused by the cold
water system, the following remedies should be
implemented.
Malfunction
location
Malfunction
Cause of malfunction
Effect
Remedy
Cold water
system
Corrosion
and
contaminants
in the cold
water system
Insufficient cleaning after a
new installation
Unclean and aggressive
water leads to a
weakening of the material
and to improper function.
The function of
components such as the
2-way control valve and
the flow meter is strongly
impaired through
contaminants.
During initial installation, the
pipe network and the system
parts should be flushed out
before the installation of the
Liquid Cooling Package.
62
Improper treatment of the
water with corrosion
protection additives
Rittal GmbH & Co. KG
recommends the installation
of filters and the treatment of
the water with appropriate
corrosion and, if needed,
antifreeze additives. The
recommended notes
regarding water quality are
found in Chapter 15.1
"Hydrological information".
Older systems with existing
contaminants
Upon integration in existing
cold water networks, the use
of a water/water heat
exchanger is recommended.
This forms a second water
cycle.
Rittal Liquid Cooling Package
10 Inspection and maintenance
10
Inspection and maintenance
EN
The Liquid Cooling Package is largely maintenance-free.
An additional external filter should be used if the cooling
water is contaminated. This should be cleaned regularly.
– The condensate discharge device should be checked
regularly for proper function.
– Visually inspect for leaks regularly (annual cycle).
Note:
At an ambient temperature of 40°C, the
nominal service life of the built-in fan is 40,000
operating hours.
Fan module malfunctions are displayed on the
optional graphical display or on the status
screen of the Basic CMC (if the Basic CMC is
connected to a network). Furthermore, the
built-in control that is responsible for two fan
modules compensates fully in the event of a
fan module failure.
Rittal Liquid Cooling Package
63
11 Storage and disposal
EN
11
Storage and disposal
Caution! Risk of equipment damage!
The air/water heat exchanger must not be
subjected to temperatures above +70°C
during storage.
During storage, the air/water heat exchanger must stand
upright.
Disposal can be performed at the Rittal plant.
Please contact us for advice.
Emptying:
During storage and transportation below freezing point,
the air/water heat exchanger should be drained
completely.
To this end, with the Liquid Cooling Package, the valves
in the lowest heat exchanger position should be opened
so that the cooling liquid can run out.
64
Rittal Liquid Cooling Package
12 Technical specifications
12
Technical specifications
EN
12.1 30 kW versions
Fig. 90: Rating plates for LCP Rack 30 CW (SK 3311.130), LCP Rack 30 CW (SK 3311.230) and LCP Inline 30 CW (SK 3311.530)
Technical specifications
Description/Model No. SK
TopTherm LCP Rack 30 CW / 3311.130 (1000 mm depth)
Description/Model No. SK
TopTherm LCP Rack 30 CW / 3311.230 (1200 mm depth)
Description/Model No. SK
TopTherm LCP Inline 30 CW / 3311.530 (1200 mm depth)
Dimensions and weight
Dimensions width x depth x height (mm)
300 x 2000 x 1000 (SK 3311.130) or 1200 (SK 3311.230/530)
Usable U
42
Weight, max. [kg]
200
Electrical connection
Type of electrical connection
Connector
Rated voltage [V, Hz]
230/1~ 50/60
400/3~/N/PE 50/60
Rated current [A]
4.5
1.5
Pre-fuse T [A]
20
16
Duty cycle [%]
100
Cooling output
Number of fans
1
2
3
Cooling output [kW]
10
20
30
Power consumption Pel [kW]
0.19
0.36
1.05
Rittal Liquid Cooling Package
65
12 Technical specifications
EN
Technical specifications
Air throughput, max. [m3/h]
4800
Cooling circuit
Cooling medium
Water (see Internet for specifications)
Coolant inlet temperature [°C]
+15
Permissible operating pressure pmax [bar]
6
Fill quantity [l]
7
Water connection
1½" outer thread
Other information
Temperature control
Linear fan control/2-way control valve
Ambient temperature range [°C]
+6 to +35
Noise level [dB(A)]
(Open air above reflective flooring, distance 1 m)
74.5
Colour
RAL 7035
Tab. 16: Technical specifications for 30 kW versions
12.2 60 kW versions
Fig. 91: Rating plates for LCP Rack 60 CW (SK 3311.260) and LCP Inline 60 CW (SK 3311.560)
66
Rittal Liquid Cooling Package
12 Technical specifications
Technical specifications
EN
Description/Model No. SK
TopTherm LCP Rack 60 CW / 3311.260
Description/Model No. SK
TopTherm LCP Inline 60 CW / 3311.560
Dimensions and weight
Dimensions width x depth x height (mm)
300 x 2000 x 1200
Usable U
42
Weight, max. [kg]
210
Electrical connection
Type of electrical connection
Connector
Rated voltage [V, Hz]
230/1~ 50/60
400/3~/N/PE 50/60
Rated current [A]
12.3
4.1
Pre-fuse T [A]
20
16
Duty cycle [%]
100
Cooling output
Number of fans
4
5
6
Cooling output [kW]
40
50
60
1.7
2.2
2.8
Power consumption Pel [kW]
Air throughput, max. [m
3/h]
8000
Cooling circuit
Cooling medium
Water (see Internet for specifications)
Coolant inlet temperature [°C]
+15
Permissible operating pressure pmax [bar]
6
Fill quantity [l]
7
Water connection
1½" outer thread
Other information
Temperature control
Linear fan control/2-way control valve
Ambient temperature range [°C]
+6 to +35
Noise level [dB(A)]
(Open air above reflective flooring, distance 1 m)
77
Colour
RAL 7035
Tab. 17: Technical specifications for 60 kW versions
Rittal Liquid Cooling Package
67
13 Spare parts
EN
13
Spare parts
Item
Qty./Pack
Control unit
1
Water PCB
1
Fan PCB
1
Startup current limitation
1
Fan, single
1
Leakage sensor
1
Control valve
1
Flow meter 5-100
1
Flow meter 10-200
1
Temperature sensor, hot/cold air
1
Temperature sensor, water inlet
1
Temperature sensor, water return
1
Fuse box with breaker, EMC filter and
power pack
1
Tab. 18: Spare parts list – Liquid Cooling Package
68
Rittal Liquid Cooling Package
14 Accessories
14
Accessories
EN
Item
Model No.
Qty./Pack
Vertical shielding (foam strips) for enclosure width
600 mm, for mounting side panel
SK 3301.380
1
Vertical shielding (foam strips) for enclosure width
600 mm, for mounting Liquid Cooling Package
SK 3301.370
1
Vertical shielding (foam strips) for enclosure width
800 mm, for mounting side panel
SK 3301.390
1
Vertical shielding (foam strips) for enclosure width
800 mm, for mounting Liquid Cooling Package
SK 3301.320
1
Air baffle plate for TS, for enclosure width 600 mm
DK 7151.206
2
Air baffle plate for TS, for enclosure width 800 mm
DK 7151.208
2
Add-on cover
SK 3301.221
1
Connection hose bottom/top
SK 3311.040
2
Connection cable, three-phase
SK 7856.025
1
Touch panel display, colour
SK 3311.030
1
Fan module
SK 3311.010
1
Rear adaptor for LCP Inline
SK 3311.080
1
Server enclosure compensating panel for LCP Inline
DK 7067.200
1
Comments
EU-type
Tab. 19: Accessories list – Liquid Cooling Package
Rittal Liquid Cooling Package
69
15 Further technical information
EN
15
Further technical information
15.1 Hydrological information
To avoid system damage and to ensure safe operation,
Rittal GmbH & Co KG recommends the use of system
water or an additive whose composition does not differ
from that presented in the following summary:
pH value
7 – 8.5
Calcium hardness
> 3 < 8 °dH
Free carbonic acid
8 – 15 mg/dm3
Accompanying
carbonic acid
8 – 15 mg/dm3
Corrosive carbonic
acid
0 mg/dm3
Sulphides
Free
Oxygen
<10 mg/dm3
Chloride ions
< 50 mg/dm3
Sulphate ions
< 250 mg/dm3
Nitrates and nitrites
< 10 mg/dm3
COD
< 7 mg/dm3
Ammonia
< 5 mg/dm3
Iron
< 0.2 mg/dm3
Manganese
< 0.2 mg/dm3
Conductivity
< 2200 µS/cm
Residue on
evaporation
< 500 mg/dm3
Potassium
permanganate
consumption
< 25 mg/dm3
Suspended matter
< 3 mg/dm3
> 3 < 15 mg/dm3 Partial flow
purification recommended
> 15 mg/dm3 Continuous
purification recommended
Tab. 20: Hydrological data
70
Rittal Liquid Cooling Package
15 Further technical information
15.2 Characteristic curves
EN
15.2.1 Cooling output
All information in the diagrams refers to the use of pure
water as a cooling medium. The cooling performance
data when using a water-glycol mixture is available on
request from Rittal.
LCP Rack/Inline 3311.130/230/530 (15˚C water inlet, 60 l/min)
35
Cooling output [kW]
30
25
20
15
10
5
0
1
2
3
Number of fans in LCP
Fig. 92: Cooling output of the Liquid Cooling Package in the "30 kW" version
LCP Rack/Inline CW (3311.260/560) with 4 fans (15˚C water inlet)
42
Cooling output [kW]
40
38
36
34
32
30
80 (4.8)
100 (6)
120 (7.2)
140 (8.4)
Flow rate [l/min; (m³/h)]
Fig. 93: Cooling output of the Liquid Cooling Package in the "60 kW" version with four fans
Rittal Liquid Cooling Package
71
15 Further technical information
EN
LCP Rack/Inline CW (3311.260/560) with 5 fans (15˚C water inlet)
46
Cooling output [kW]
44
42
40
38
36
34
32
30
80 (4.8)
100 (6)
120 (7.2)
140 (8.4)
Flow rate [l/min; (m³/h)]
Fig. 94: Cooling output of the Liquid Cooling Package in the "60 kW" version with five fans
LCP Rack/Inline CW (3311.260/560) with 6 fans (15˚C water inlet)
60
Cooling output [kW]
55
50
45
40
35
30
80 (4.8)
100 (6)
120 (7.2)
140 (8.4)
Flow rate [l/min; (m³/h)]
Fig. 95: Cooling output of the Liquid Cooling Package in the "60 kW" version with six fans
72
Rittal Liquid Cooling Package
15 Further technical information
15.2.2 Pressure loss
EN
Device pressure loss LCP Rack/Inline CW, 30kW (3311.130/230/530)
1
0,9
Pressure loss [bar]
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
0
0
20 (1.2)
30 (1.8)
40 (2.4)
50 (3)
60 (3.6)
70 (4.2)
80 (4.8)
120 (7.2)
140 (8.4)
Water flow rate [l/min; (m³/h)]
Fig. 96: Pressure loss of the Liquid Cooling Package in the "30 kW" version
Device pressure loss LCP Rack/Inline CW, 60kW (3311.260/560)
1,6
1,4
Pressure loss [bar]
1,2
1
0,8
0,6
0,4
0,2
0
0
20 (1.2)
40 (2.4)
60 (3.6)
80 (4.8)
100 (6)
Water flow rate [l/min; (m³/h)]
Fig. 97: Pressure loss of the Liquid Cooling Package in the "60 kW" version
Rittal Liquid Cooling Package
73
Wärmetauscher
Heat exchanger
Wasserbaugruppe
Water assembly
135
View from above (1:3)
Mounting hole for
cooling water connection
from above
ISO-Ansicht ohne linke Seitenwand/
ISO view without left side panel (1:10)
Seitenwand links
Side panel, left
Fronttür mit optionalem Touchpanel
Front door with optional touch panel
Lüfter
Fan
Fachboden für Steuerung
Shelf for control unit
ISO-Ansicht/
ISO view (1:10)
Abdeckblech für die hintere Perforation
Cover plate for perforated area, rear
Seitenwand rechts
Side panel, right
Stromverteilungswanne
Power distribution tray
Auslass / Outlet 1 1/2"
Einlass / Inlet 1 1/2"
Rechts/Right (1:10)
17,5
2016
58,5
(42,5)
55,5
212
View from below (1:3)
Mounting hole for the
cooling water connection
through the raised floor
Luftdurchlass vorn
Punched area, front
169 x 1803
Links/Left (1:10)
1295
Ansicht von unten (1:3)
Montageöffnung für den
Kühlwasseranschluss durch
den Doppelboden
Luftdurchlass hinten
Punched area, rear
255 x 1760
Dachblech zur optionalen Schlauchdurchführung von oben
Roof plate for optional pipe entry from top
Ansicht von unten/
View from below
297
Vorne/Front (1:10)
120,25
Rückansicht ohne Rücktür/
Rear view without rear door (1:10)
Rücktür Standard
Rear door Standard
Rückansicht Standard/
Rear view, standard (1:10)
Tropfenabscheider (modellabhängig)
Optional mist eliminator (depending on version)
(66,25)
Ansicht von oben (1:3)
Montageöffnung für den
Kühlwasseranschluss
von oben
Rücktür Inline
Rear door Inline
80
32,5
600
52,75
493,5
79
74
46,5
Rückansicht Inline/
Rear view, Inline (1:10)
15 Further technical information
EN
15.3 Overview drawings
Fig. 98: Overview drawing of Liquid Cooling Package
Rittal Liquid Cooling Package
15 Further technical information
15.4 Circuit diagram
EN
LCP-X1:
X2:
X3:
X4:
Klemmleiste AC-In / Terminal strip AC-In
AC Klemmleiste Opt. Kd-pumpe / AC terminal strip optional condensate pump
DC Klemmleiste Opt. Kd-pumpe / DC terminal strip optional condensate pump
Busschnittstelle / Bus interface
SV-X1:
X2:
X3:
X4:
Z1:
X48:
A3:
F1:
F3:
F4:
F5:
Klemmleiste AC-In Stromvers./Terminal strip power supply AC-In
Klemmleiste SV AC-Out / Terminal strip power supply AC-Out
Klemmleiste Kond-Pumpe / Terminal strip condensate pump
Klemmleiste 24V CMC / Terminal strip 24V CMC
EMV Netzfilter / EMC line filter
Klemmleiste / Terminal strip
Netzteil AC-DC / Power supply AC-DC
Hauptsicherung / Breaker
Sicherung Lüfter 1-2 / Fuse fan 1-2
Sicherung Lüfter 3-4 / Fuse fan 3-4
Sicherung Lüfter 5-6 / Fuse fan 5-6
LCP-A1:
A2:
A4:
A5:
A6:
A7:
Steuerplatine CMC / Control board CMC
Display Optional / Display optional
Wasserplatine / Water board
Lüfterplatine / Fan board
Kondensatp.-platine Optional / Condensate pump board optional
ESB-Modul / ESB module
M1:
M2:
B1:
B2:
B3.1:
B3.2:
B4:
B5:
Y1:
B6:
B7:
X21:
X22:
X23:
X25:
X26:
X27:
X33/A2:
X2/A6:
X3/A6:
Kondensatpumpe Optional / Condensate pump optional
Lüfter / fan
Temp.Fühler Wasser Vorl. / Temp. sensor water inlet
Temp.Fühler Wasser Rückl. / Temp. sensor water return
Durchflussmesser / Flow meter
Optional DF / Optional flow meter
Leckagefühler / Leakage sensor
Kondensatfühler / Condensate sensor
Regelkugelhahn / Control valve
Temperaturfühler Lüfter 1-6 / Temp. sensor fan 1-6
Temperaturfühler Hex1-6 / Temp. sensor hex 1-6
DC Versorgungskabel CMC / DC power supply cable CMC
I2C Buskabel CMC - Lü.-m. / I2C bus cable CMC fan controller
I2C Buskabel Lüm.-Wam / I2C bus cable fan contr. - water contr.
Displaykabel optional / Display cable optional
DC Eingang Lüfter 1 bis 6 / DC input fan 1 to 6
AC Versorgung Lüfter 1 bis 6 / AC power supply fan 1 to 6
Displayanschluss / Display connection
Optionales AC Kabel Kd.-Pumpe / Optional AC cable cond. pump
Optionales DC Kabel Kd.-Pumpe ein / Optional DC cable cond. pump on
Optional
condensate pump
I = 0,5 A
Achtung / Warnung
Hoher Ableitstrom / High leakage current
Vor Netzanschluss an den Versorgungsstromkreis
unbedingt Erdungsverbindung herstellen! /
Earthing must be made before
connecting the supply!
Fig. 99: Circuit diagram
Rittal Liquid Cooling Package
75
15 Further technical information
15.5 Water circulation diagram
EN
4
5
3
2
6
1
Fig. 100: Water circulation diagram
Key
1
2
3
4
5
6
76
Temperature sensor, inlet
Flow sensor, inlet
Control valve, inlet
Heat exchanger
Non-return valve, return
Temperature sensor, return
Rittal Liquid Cooling Package
16 Preparation and maintenance of the cooling medium
16
Preparation and maintenance of
the cooling medium
EN
Depending on the type of installation to be cooled,
certain purity requirements are placed on the cooling
water in a recooling system. According to the level of
contamination and the size and design of the recooling
systems, a suitable process is used to prepare and/or
maintain the water. The most common types of
contamination and frequently used techniques to
eliminate them in industrial cooling are:
Type of impurity
Procedure
Mechanical
contamination
Filter the water using:
Mesh filter, sand filter, cartridge
filter, precoated filter, magnetic
filter
Excessive hardness
Soften the water via ion exchange
Moderate content of
mechanical
contaminants and
hardeners
Treat the water with stabilisers
and/or dispersing agents
Moderate content of
chemical
contaminants
Treat the water with passivators
and/or inhibitors
Biological
contaminants, slime
bacteria and algae
Treat the water with biocides
Tab. 21: Cooling water contaminants and treatment procedures
Note:
For the proper operation of a recooling system
that uses water on at least one side, the
composition of any additive used or system
water should not deviate substantially from
hydrological data presented in Chapter 15.1
"Hydrological information".
Rittal Liquid Cooling Package
77
17 Frequently asked questions (FAQ)
EN
17
Frequently asked questions (FAQ)
Note:
This chapter contains only a selection of the
frequently asked questions (FAQ). Further
FAQs may be found on our website:
www.rimatrix5.com
In what output ranges is the Rittal Liquid Cooling
Package available?
The cooling output of an air/water heat exchanger is
basically dependent on the inlet temperature and
volumetric flow of the water as well as the air
throughput achieved by the fans which are used. Up to
30 kW of cooling output is possible. In correctly
assessing the information, it is important to note at
what ΔT (temperature differential between server air
inlet and server air outlet) these values were reported.
Modern servers such as 1 U-Dual CPU systems or
blade servers can have a ΔT of up to 25°C. Please
note the recommendations of the server manufacturer.
Are special components required for use with the Liquid
Cooling Package?
All components that follow the "front to back" cooling
principle (99% of IT equipment) may be used without
restriction in connection with the Liquid Cooling
Package. Every Rittal server rack which was previously
cooled conventionally may be cooled with a Liquid
Cooling Package after changing to sealed doors. In
other words, it is possible to retrofit standard racks
and bay them onto the Liquid Cooling Package. The
server enclosure remains unaffected by the side
installation of the Liquid Cooling Package. All height
units remain fully usable in their complete depth.
Further, by locating the foam strips appropriately,
sufficient cooling is also possible for devices which
require sideways air throughput (e.g. switches).
Is the ambient air heated by additional heat coming out
of these enclosures?
The cooling system in the enclosure works completely
independently of the ambient air. All waste heat is
transferred externally through the cooling water circuit.
May the quantity of heat removed be controlled
dependent on the heat loss?
The controlled variable for the Liquid Cooling Package
is the temperature of the air blown in in front of the
482.6 mm (19") level. The values to be used here are
available in the manufacturer's instruction manual.
Upon installation, the desired setpoint temperature is
set once on the Liquid Cooling Package. This value will
be kept constant, irrespective of the cooling output
demands. This occurs through the corresponding
automatic opening and closing of the 2-way control
78
valve. Additionally, the necessary fan output is
adjusted based on the difference between the serverout temperature and the target temperature. In this
manner, the Liquid Cooling Package always cools only
as much as is necessary without wasting energy.
Further, this avoids problems arising from
condensation and desiccation which results from
overcooling.
How is the airflow in the enclosure achieved and what
advantages does this have?
As a general rule, the "front to back" principle is used
in server enclosures. Cold air is supplied to the front of
the enclosure. The units built into the enclosure have
their own fans, which draw in this air and use it
internally for cooling. Thus heated, it is exhausted to
the rear. The special horizontal air routing of the Liquid
Cooling Package, which is adapted especially to this
widespread cooling principle, evenly supplies cooled
air to the complete height of the server enclosure. That
means that all units, independent of their installation
position in the enclosure and their charge state,
receive sufficient cold air. Temperature gradients are
avoided, so that an extremely high cooling output can
be achieved for each enclosure.
Can the LCP Rack be operated with its doors open?
The response of the Liquid Cooling Package upon
operation with opened doors depends chiefly upon the
prevailing ambient conditions. If a front door is opened,
the cool air is mixed marginally with the ambient air.
Thus, no cooling problems are expected in air
conditioned rooms. Overall, no heat is carried into the
room. The back door should only be opened for a
short while during operation, since this breaks the
cooling air circuit, resulting that the waste heat is
carried into the room. However, this does not influence
the cooling of the units in the enclosure.
Why is the Liquid Cooling Package, as an air/water heat
exchanger, installed on the side panel?
It was important to develop a high performance
cooling system which would also meet the
requirements of the coming years. This could only be
achieved by routing the cooling air in a manner which
was tailored to the needs of the devices. The main
problem associated with cooling by air from the raised
floor or with top or bottom heat exchangers is air
routing. Cold air which is fed into the enclosure from
below or above changes its temperature greatly
because of recirculation. Temperature differentials of
up to 20°C were measured from "below" to "above" in
enclosures found in data centres. Thus, a server
installed "below" in an enclosure may have
temperature conditions of up to 20°C "better" than one
installed "above" in an enclosure. Because of this, in
order to achieve sufficient cooling of all systems in the
enclosure when using this sort of cooling, a
Rittal Liquid Cooling Package
17 Frequently asked questions (FAQ)
significantly lower air temperature must be used. When
cooling air is provided from the side, this problem does
not arise. Cooling is more effective and more exact
because the air supplied to the units can be held within
1-2°C.
Because the system is built as its own enclosure, the
system is protected against the risk of leaks. All watercarrying parts are located outside the actual server
enclosure. Connection to the cooling water network is
made in the floor. Further, Rittal has many years of
experience in the field of air/water heat exchangers. All
of this experience is incorporated into the construction
of the Liquid Cooling Package. Because of these
precautionary measures, even in the very unlikely event
of a leak, water cannot find its way into the area for
electronic components. Because of its "thin" profile of
just 300 mm, the pattern achieved in the data centre is
not interrupted. Because the depth of the enclosures
is not increased, the full width of the walkways in the
data centre is maintained.
How is water connected to the Liquid Cooling Package?
For easy installation, connection to the building or
recooling system is made, as desired, from below or
from the rear with 1½" threaded connections. Of
course, these may be exchanged with quick-release
couplings.
Can both air-cooled and water-cooled server
enclosures operate side-by-side in a data centre?
Of course. There must only be a water installation
available for the water-cooled enclosures. The
advantage of this is that the existing room air
conditioning is not further burdened. Thereby, Liquid
Cooling Package systems can be used to intercept
hotspots in the data centre without requiring the
expansion of the air conditioning system.
Which dimensions are usable for the Liquid Cooling
Package?
The Liquid Cooling Package itself has the dimensions
W x H x D 300 x 2000 x 1000/1200 mm. Every Rittal
enclosure with the dimensions H x D 2000 x 1000/
1200 mm, independent of width, can be bayed. Other
sizes available on request.
Does the Liquid Cooling Package require maintenance?
The Liquid Cooling Package is maintenance free. All
components are designed with an extremely long
lifespan. In case of a malfunction a message is
generated through the alarm output of the control unit
or through the Basic CMC.
What advantages does a water-cooled solution have
over an air-cooled solution in a data centre?
The use of water-cooled enclosures allows for
controlled, efficient and cost-saving cooling of heat
Rittal Liquid Cooling Package
losses, which was not possible with conventional air
conditioning. Thus, it is possible to fully use the space,
which is physically available in the enclosures, instead
of being forced to erect half-empty enclosures
because of air conditioning problems. This achieves
considerable savings in the investment and operating
costs of a data centre.
Is a raised floor necessary for installation? If yes, what
height is required?
A raised floor is not required for routing the cooling
water pipes. In principle, the pipes can also be laid in
channels in the floor. A main cooling pipe requires
approx. 150 mm headroom in a raised floor; an
enclosure supply line approx. 50 mm. With highquality composite pipes, such as those used in
underfloor heating, an extremely flexible routing of the
cooling water pipelines is possible.
Can LCP-cooled enclosures also be bayed with one
another?
Basically, the Liquid Cooling Package is just a "small"
enclosure. That means that all accessories for baying
may be used. Thus, LCP-cooled systems may be
bayed without limitation.
How is condensate formation prevented in the Liquid
Cooling Package?
Condensation can only occur when air is significantly
cooled below the ambient temperature. Thus, its
capacity to absorb or "hold" water is reduced. In the
norm, the Liquid Cooling Package works with water
temperatures above the dewpoint. Condensate
formation is thus excluded. If the system is operated
with lower temperatures, the control minimises
condensate formation. Any arising condensate is
effectively hindered from leaving the Liquid Cooling
Package through design measures. These measures
include suitable air routing, wipe-off grids and
condensate management.
How does the Liquid Cooling Package prevent
desiccation?
At the same time that air is cooled, it is also
dehumidified. Because of cable entry points, the
system is not 100% sealed off from its surroundings.
This small amount of exchange with external air is
sufficient to hold the air's relative humidity above 30%
and thus non-critical. At no time is there the danger of
static charges arising in the enclosure.
Can the Liquid Cooling Package be operated together
with the CPU cooling solution?
A combination of direct CPU cooling with water and
the Liquid Cooling Package is always possible.
Depending on the computer system, only up to 70% of
the total heat loss is removed through the water heat
79
EN
17 Frequently asked questions (FAQ)
EN
sinks with direct CPU cooling. In cases of high cooling
output requirements, this means that a combination of
systems is even necessary. Please request our
documentation for individual projects separately.
In case a pipe should break or burst, how is water entry
into the server rack avoided?
Because the components are carefully chosen, it is
practically impossible for a pipe to break. The base unit
of each LCP serves as a collecting tray for water, and
is capable of collecting either condensate or leaked
water. Through the physical separation of the Liquid
Cooling Package from the server enclosure, it is
always ensured that no water can enter into the server
area. Additionally, the integrated leakage sensor
reports even the smallest leak volumes to allow for a
rapid response.
Why does the LCP Rack offer the opportunity of cooling
either one or two enclosures?
The most important design principle was a flexible
cooling system which would correspond to the
enormous volume of air required by a modern server.
Because of the horizontal cooling possibility, options
for "right", left" or "both-sided" cooling arise in
combination with the chosen fans. Cooling a server
rack with two Liquid Cooling Packages has the
advantage of complete system redundancy without
further installation of 482,6 mm (19") equipment (see
Chapter 3.6.1"Creation of redundancy in the
LCP Rack").
In which applications and situations should an air/water
heat exchanger system be used?
Whenever the cooling output of the room air
conditioning system is not sufficient to handle the heat
loads of current high performance servers. With an
optimal design in a newly planned data centre, this limit
is at about 1,000 – 1,200 W/m²; in older data centres,
it is often significantly below that. At best, a maximum
of 4 kW per rack needs to be removed. By contrast,
racks which are filled with blade servers reach up to
17 kW. But the Liquid Cooling Package represents a
possible solution even in applications where there is no
existing air conditioning system. In combination with
Rittal recooling systems, even climate control solutions
for high performance cluster systems can be created.
What additional infrastructure is required to operate the
system?
In addition to the Liquid Cooling Package, pipes to the
individual enclosures and a system for generating the
cooling water are required. With single enclosures, a
direct connection with the cooling water is sufficient.
With multiple enclosures, a cooling water distribution
system, similar to a central heating distribution system,
should be provided. To a great degree, this
80
infrastructure corresponds to that which is already
used in a conventionally air conditioned data centre.
The "cold" water is provided by water chillers (with
adequate redundancy, especially in regard to the
pumps). The water is distributed over a cooling water
network in the data centre to fan coil or ceiling cooling
units.
What key disadvantages of today's air-cooled solutions
are remedied by water cooling?
The chief problem of conventional cooling involves
directing large amounts of cool air through raised
floors, suspended ceilings and within the room. Often,
because of complex flow conditions, the cold air does
not reach the servers in sufficient quantities. There is
actually enough cold produced; often, the cooling
output from raised floor systems lies far above the
electrically connected load of the unit, which needs to
be cooled. In spite of this, the cooling is insufficient.
This effect is explained by the fact that the cooling air
is already warmed too much through recirculation on
its way to the server. By using water to remove the
heat out of the enclosure, an excellent separation
between cold air and removed thermal energy is
achieved. Because of its material characteristics,
water can transport thermal energy almost 4,000 times
"better" than air. Small pipes are capable of
transporting very large quantities of heat.
Can accessories and other equipment from 482.6 mm
(19") enclosures be used in conjunction with the Liquid
Cooling Package?
The Liquid Cooling Package and the accompanying
server enclosure are standard products within the
Rittal family of enclosures. All components and
accessory parts can be used without limitation.
Up to what depth may servers be installed?
Modern server systems may be up to 800 mm deep.
Because of that, it is recommended that the 482.6 mm
(19") level in the enclosure be installed so that the
same distance remains to the door in front and in back.
In combination with the space on the side between the
482.6 mm (19") level and the Liquid Cooling Package,
sufficient room for the air which is fed or emitted is
achieved. The side openings do not need to be
completely open throughout their depth.
How does the Liquid Cooling Package respond to an
elevated ambient temperature or fire?
Because the closed design seals the system to the
outside, even greatly increased ambient air
temperatures are not a problem – as long as the cold
water supply is functioning. This represents an
effective protection against the effects of fire in case of
a fire in the room. Smoke, corrosive gases, water
steam and fire-fighting water are securely kept away.
Rittal Liquid Cooling Package
17 Frequently asked questions (FAQ)
Only extremely high temperatures or direct exposure
to flames would be critical, but the consequences of
fire in the area or in the adjacent room are in any case
restrained.
Does the maximum depth available for installed
equipment correspond with the enclosure's depth?
Almost the entire depth of the enclosure can be used
for installed equipment.
No other space for installed mechanical equipment,
e.g. fans, is required.
Rittal Liquid Cooling Package
EN
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18 Glossary
EN
18
Glossary
1 U server:
1 U servers are very flat and deep, modern high
performance servers, whose height corresponds to
one height unit (1 U = 44.54 mm, the smallest
standard height division). Typical dimensions are
(W x D x H) 482.6 mm (19") x 800 mm x 1 U.
These systems normally include 2 CPUs, many GB
RAM and hard drives, so that they require up to
100 m3/h cooling air at a maximum of 32°C.
482.6 mm (19") level:
The front sides of the devices built into the server
enclosure form the 482.6 mm (19") level.
Blade server:
By orienting dual CPU systems vertically and placing
up to 14 units on a common backplane to provide for
signal routing and power supply, one has a so-called
blade server.
Blade servers can "generate" up to 4.5 kW heat loss
per 7 U and 700 mm depth.
"Front to back" cooling principle:
The devices built into the server enclosure are normally
cooled according to the "front to back" cooling
principle.
Under this cooling principle, cold air supplied by
external air conditioning is blown to the front of the
server enclosure. The fans in the devices built into the
server enclosure direct this air horizontally through the
server enclosure. The air is warmed through this
process and is exhausted out the rear of the enclosure.
Hotspot:
A hotspot is the concentration of thermal energy in a
small area.
Hotspots normally lead to local overheating and can
cause system malfunctions.
Air/water heat exchanger:
Air/water heat exchangers operate according to the
same principle as automobile radiators. A liquid (water)
flows through the heat exchanger, while, at the same
time, air is blown over its surface area (which is as large
as possible), facilitating energy exchange.
Depending on the temperature of the circulating liquid
(water), an air/water heat exchanger may either heat or
cool the circulated air.
Recooling system:
As an initial comparison, a recooling system is like a
refrigerator – through an active cooling circuit, unlike a
household refrigerator, a recooling system produces
cold water. The thermal energy which is removed from
the water is dissipated to the outside by fans. Because
of this, it is normally advisable to locate recooling
systems outside of buildings.
Recooling systems and air/water heat exchangers
form a normal cooling combination.
Switch:
Multiple servers normally communicate with one
another and in the network using switches.
Because as many inputs as possible are located on
the front side of switches, they frequently have an
airflow from the side, not "front to back" cooling.
Fig. 101: "Front to back" cooling principle with bayed LCP Rack
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Rittal Liquid Cooling Package
Enclosures
Power Distribution
Climate Control
IT Infrastructure
Software & Services
1st edition 12.2011 / ID no. 329 045
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RITTAL GmbH & Co. KG
Postfach 1662 z D-35726 Herborn
Phone +49(0)2772 505-0 z Fax +49(0)2772 505-2319
E-mail: info@rittal.de z www.rittal.com