CL20 Brochure May 2020 v4

ColdLogik
CL20 Rear Door Cooler

ColdLogik CL20 Rear Door Cooler
Contents
CL20 Rear Door Cooler
Overview and principle Page 3-5
A proven solution Page 6
CL20 Rear Door Cooler range Page 7
Technical information Page 8-11
Power requirements Page 12-13
CL20 Smart Passive Page 14-20
CL20 Interface frame Page 21
ColdLogik Management System (CMS) Page 22-23
Room Management System (RMS) Page 24-25
CL20 Cabinets and options Page 26-27
ColdLogik Rear Door Coolers are the award winning data

centre cooling solution – recognised with the award of the
UK’s most prestigious business prize: the Queen’s Award for
Enterprise: Innovation, 2013.
In 2013/2014, two major UK data centres, where ColdLogik is

used exclusively, have won the BCS, The Chartered Institute for
IT, Certified Energy Efficient Datacentre (CEEDA) award – one
won Gold for best in class capability, the other Silver for
advanced capability.
The Gold winner also won the 2012 Project Excellence Award,
an annual prize given to a public or private sector entrant for
the most outstanding data centre project.
We are also in the unrivalled position of having two top 10

projects in the current Green 500 list, demonstrating the
most efficient data centres in the world.
Since then, we have gone on to sell the ColdLogik solution in

six continents for small , medium and large, prestige sites with
ColdLogik Rear Door Coolers are designed, developed,
continued success.
manufactured and sold internationally by USystems.. They
replace the traditional approach to data centre cooling,
allowing load removal of up to 92 kW per cabinet
USystems Limited, EMEA, Systems House, 235 Ampthill Road, BEDFORD MK42 9QG United Kingdom
Tel: +44 (0) 1234 761 720 sales@usystems.co.uk
USystems Inc. NORTH AMERICA , 10 Glenlake Parkway, Suite 130, ATLANTA Georgia 30328 USA
+1 214 307 6033 sales@usystems.com

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Overview and principle
ColdLogik CL20 Rear Door Coolers are fitted to the back of an enclosure, typically
being IEC 297 3 and EIA STD 310 compliant. The coolers ensure optimum thermal and
energy performance by removing the heat generated by the active equipment
directly at source, preventing hot exhaust air entering the data room.
Ambient air is pulled into the cabinet by the active equipment fans – the hot air
produced by the equipment passes over a heat exchanger matrix, either by its own
velocity or being pulled through via EC centrifugal fans mounted in the CL20 door. The
heat is rejected to coolant and chilled air is passed back into the room at a
predetermined ambient temperature.
The coolers can be sited within an existing data centre to work with existing computer
room air-conditioning to provide additional cooling. They also reduce energy
consumption, remove hot spots and can be retrofitted to existing or new build OEM
cabinets using an interface frame or fitted directly to a ColdLogik compliant USpace
cabinet.
Single source solution
To gain the optimum energy performance from ColdLogik, the coolers should be
deployed as a single source – i.e. used to control the entire computer room / data
centre without additional air conditioning, including retrofit scenarios.
How ColdLogik
cools a data cabinet
Exit air returned to data centre at

predetermined temperature
Coil removes heat at

Room ambient air
source
pulled into cabinet
Active equipment air

exhaust to cooler
Page 3

ColdLogik Management System – CMS
The key element in controlling the room environment is the ColdLogik Management System (CMS).
Each rear cooler is intelligently managed for optimum efficiency by embedded computers which
continually adjust the operational parameters in response to the heat removal demands placed on the
system. By making these continual load adjustments, the CMS controllers maintain the room ambient
temperature There’s more information about CMS on page 20-21
ColdLogik Room Management System – RMS

The Room Management System (RMS) monitors and manages devices and plant on the ColdLogik
network by best optimisation, ensuring the room environment is maintained in the most energy
efficient way. The RMS can be viewed remotely and locally providing full access and control.
River, sea, lake

Room Management System (RMS)
return water
Borehole injection
CL20 rear cooler

CL20 rear cooler low medium to high
to medium duty duty deployment
deployment
CL20 rear cooler

low duty UPS room
deployment
SAN coolers
Fitted on cabinet using
overhead system
Options for Aisle Cooling Distribution

CL80 InRow containment Unit (CDU) with Leak
internal cooling cooler Prevention System
(LPS) in an enclosure
Page 4
Another unique but important attribute of the ColdLogik solution is the option of a patented Leak Prevention System
(LPS), which is incorporated within the Cooling Distribution Unit (CDU).
As water is present in most data centres, they have the same inherent weaknesses – such as leak detection systems
shutting down parts of the cooling system when moisture is detected.
In the event of a pipework breach, the LPS – Leak Prevention System – stops water escaping from the pipework and allows
the cooling system to continue running unimpaired, providing uptime, safety and system resilience.
External cooling options

River, lake, sea water and
similar natural sources supply External cooling selection is less restrictive with a ColdLogik system – in
many cases you do not have to rely on traditional mechanical cooling
products such as chillers.
Hybrid adiabatic cooler
This is primarily due to the design and control func-
Cooling tower tions of the CL20 rear coolers – the rear coolers
Chiller utilise much higher water supply temperatures
compared to other forms of computer room air-
conditioning to achieve the same room ambient
temperature.
Consequentially, free cooling can be obtained from

a wider range of options – as outlined in our illus-
tration.
Free cooling
module
Borehole extraction
When all the facts are taken into account, our bold claim
of 90% energy savings over and above standard computer
room aircon systems is easily justified.
Cooling Distribution Unit (CDU)

with Leak Prevention System
(LPS) on a skid
Options for
external cooling
Page 5
A proven solution
ColdLogik Rear Door Coolers replace the traditional approach to data centre
cooling, allowing loads of up to 92kW per cabinet with the added benefit of
removing real estate inherent with hot aisle/cold aisle, in row cooling, CRAC
cooling and aisle containment designs.
The waste heat generated by active equipment within a cabinet is removed at

source using water cooling – without the risk of leakage – by deploying a patented
Leak Prevention System (LPS).
ColdLogik Rear Door Coolers allow supply water temperatures to rise from the
traditional 50°F/10°C for CRAH systems to between 57°F/13.9°C and 79°F/26.1°C,
reducing chiller size and energy costs. They also increase the availability of energy
efficient ‘free cooling’, delivering up to the ASHRAE maximum 81°F/27°C (2013) ColdLogik Rear Door Coolers
room Temperature via hybrid, adiabatic or dry air coolers. utilise space far more efficiently
than hot aisle cold aisle, in row
Energy saving cooling, CRAC cooling and aisle
containment designs.
There are many energy metrics used within different industries – the air
conditioning industry uses the energy efficiency ratio (EER) and data centres often
refer to PUE (power usage effectiveness).
Power usage effectiveness (PUE)

The PUE may vary between 1.03 and 1.5 depending on the geographical location
and external ColdLogik cooling solution chosen to pair with ColdLogik Rear Door
Coolers, site conditions and architecture. Properly designed ColdLogik
installations can be between 1.03 and 1.1 for the full datacentre at full load.
These figures are not based on partial PUE but refer to the full DC environment.
A few examples of performance achieved on ColdLogik installed sites
USA west coast DC, large recent installation of 250+ coolers (4MW) which on IST showed the ColdLogik solution to need
only 50% of the water flow compared to their ‘existing’ similar solution
USA – Texas DC, Two, 1MW rooms running with Chiller/Dry air cooler & LPS @ 74°F/23.3°C supply water and 80°F/26.7°C
room temperatures. First USA DC with CEEDA Gold efficiency award for both design and operation.
UK data centre, 1MW design load, runs at approx. 700-750kW IT load – draws 25kW (winter) to 44kW (summer) cooling
power. CEEDA Gold efficiency awarded site. Uses cooling towers (only) with LPS, no chillers.
UK University, 1.2MW design load, runs at approx. 900-1200kW IT load, building with three data halls, two using AHU
and hot aisle containment (2-300kW) and one with ColdLogik coolers (7-900kW) – runs at 1.12 to 1.2 PUE. Uses Hybrid
coolers, no chillers.
Kuwait Co-Lo, ColdLogik data hall uses 50% less cooling energy than the existing AHU data hall, both systems run on
chillers (with up to 60°C/140°F ambient).
Page 6
CL20 range
CL20 C8 Rear Door Cooler—Page 8 What is Free cooling?
The C8 is capable of a maximum 45kW of ‘sensible’ cooling and is complete with Free cooling is the ability of a chiller
unit to utilise the environment it is in
the ColdLogik Management System (CMS) and five EC fans. to make the system significantly more
efficient. In the right geographical loca-
CL20 C12 Rear Door Cooler—Page 9 tions, and dependent on water design
temperatures, this technique can be
The C12 is capable of a maximum 55kW of ‘sensible’ cooling and is complete with used to cool 100% of the requirement
the ColdLogik Management System (CMS) and five EC fans. for over 90% of the year. This can lead
to seasonal efficiency figures of well in
CL20 C14 Rear Door Cooler—Page 10 excess of 100 and PUE’s on projects to
be as low as 1.03.
The C14 is capable of a maximum 85kW of ‘sensible’ cooling with an air on of 52°C
or 125°f and is complete with the ColdLogik Management System (CMS) and five
or six EC fans.
What is Sensible cooling?
CL20 C18 Rear Door Cooler—Page 11
Sensible cooling is the process of cool-
The C18 for use in 48U/52U 29.5”/750mm 31.5”/800mm coolers is capable of a ing air so that the temperature and
maximum 92kW of ‘sensible’ cooling with an air on of 53°C or 127°f and is relative humidity doesn’t pass below
‘dew point’. This is the point at which
complete with the ColdLogik Management System (CMS) and six EC fans. relative humidity becomes too high
and water will start to be collected at
CL20 Smart Passive—Pages 14-20 the point of cooling., condensation will
occur By operating at higher water
The ColdLogik CL20 Smart Passive in its active build and has a unique modular temperatures, which is the preferred
upgrade path for a ‘pay as you grow’ ethos to counter costly and wasteful ‘rip out solution, and still neutralising the same
and replace’ upgrades—see performance charts on pages 16 to 19. amount of heat you can avoid the dew
point and with it the need to manage
Available complete on a USpace 4210Z cabinet or on its own as retrofit option condensate in the space.
which can be fitted to any OEM cabinet via the CL20 interface frame.
ColdLogik Rear Door Coolers can be run with water temperatures of up to 75°F/23.9°C
Page 7
Technical information
CL20 C8 Rear Door Coolers

General specification
Maximum capacity 45kW
EER at maximum capacity 36.3
Height 42U and 48U
Width 23.62”/600mm 29.53”/750mm 31.50”/800mm
Other sizes available on request
Weight - dry 140lb/63.5kg
Weight - wet 168lb/76.3kg
Volume capacity 1.32 US gallons/5 litres
Power requirement See page 12
CL20 C8 Rear Door Cooler—Liquid cooled

The C8 is capable of the capacity you see in the graph below. This is based on a flow and return differential
of 6°C or 10.8°F utilising water as our standard medium.
Page 8
Maximum Capacity 55kW
Height 42U and 48U
Width 23.62”/600mm 29.53”/750mm 31.50”/800mm
Volume capacity 1.95 US gallons/7.4 litres
CL20 C12 Rear Door Cooler—Liquid cooled

Page 9
Technical information

Height 42U and 48U
Width 23.62”/600mm 29.53”/750mm 31.50”/800mm
Volume capacity 2.90 US gallons/10.96 litres
CL20 C14 Rear Door Cooler —Liquid cooled

Page 10
Height 48U and 52U
Width 29.53”/750mm 31.50”/800mm

Volume capacity 2.41US gallons/10.96 litres
CL20 C18 Rear Door Cooler —Liquid cooled

The C18 for use in 48U 29.5”/750mm 31.5”/800mm coolers is capable of the capacity you see in the graph
below. This is based on a flow and return differential of 6°C or 10.8°F utilising water as our standard medium.
Page 11
Power requirements for five fan doors
The ColdLogik rear door cooler is AC powered in the range 196-253Vac/50-60Hz/12.5A (max) and can be wired Phase to
Neutral or Phase to Phase thus covering most configurations. Phase to Neutral or Phase to Phase must be specified at
the time of ordering. Two supplies can be accommodated; the system has internal switchover and alarm functions.
A separate protective earth connection must be provided. The site must provide an appropriately rated single pole dis-
connect per door (either MCB or Contactor) for Phase to Neutral systems, and a dual pole disconnect for Phase to Phase
systems so that both break simultaneously. Maximum rating 20A.
ColdLogik Rear Door Cooler Current Draw Readings

Five fan coolers @ 208V 60Hz /230V 50Hz
Power for five fans Power for five fans
Fan Speed %/cfm
@ 208V 60Hz @ 230V 50Hz
25%/1045cfm 1.6A/333w 1.5A/302w
30%/1255cfm 1.9A/390w 1.7A/352w
35%/1463cfm 2A/410w 1.8A/370w
40%/1672cfm 2.2A/440w 2.0A/347w
45%/1881cfm 2.3A/480w 2.1A/434w
50%/2090cfm 2.5A/510w 2.3A/461w
60%/2509cfm 2.8A/570w 2.6A/515w
70%/2927cfm 3.3A/680w 3.0A/614w
80%/3345cfm 4A/829w 3.6A/750w
90%/3763cfm 4.7A/976w 4.4A/882w
100%/4181cfm 5.1A/1269w 4.7A/1147w
Phase to Phase Phase to Neutral
Page 12
Power requirements for six fan doors
The ColdLogik rear door cooler is AC powered in the range 196-253Vac/50-60Hz/12.5A (max) and can be wired Phase to
Neutral or Phase to Phase thus covering most configurations. Phase to Neutral or Phase to Phase must be specified at
the time of ordering. Two supplies can be accommodated; the system has internal switchover and alarm functions.
A separate protective earth connection must be provided. The site must provide an appropriately rated single pole dis-
connect per door (either MCB or Contactor) for Phase to Neutral systems, and a dual pole disconnect for Phase to Phase
systems so that both break simultaneously. Maximum rating 20A.
ColdLogik Rear Door Cooler Current Draw Readings

six fan coolers @ 208V 60Hz/230V 50Hz
Power for six fans Power for six fans
Fan Speed %/cfm
@ 208V 60Hz @ 230V 50Hz
25%/1255cfm 1.6A/333w 1.5A/302w
30%/1505cfm 1.8A/375w 1.6A/339w
35%/1756cfm 2A/416w 1.8A/376w
40%/2007cfm 2.3A/478w 2.1A/432w
45%/2258cfm 2.6A/541w 2.4A/489w
50%/2509cfm 2.9A/603w 2.7A/545w
60%/3011cfm 3.5A/728w 3.2A/658w
70%/3513cfm 4.3A/895w 3.9A/804w
80%/4015cfm 5.1A/1061w 4.7A/959w
90%/4516cfm 6.1A/1269w 5.5A/1147w
100%/5018cfm 7.1A/1477w 6.4A/1335w
Page 13
CL20 Smart Passive
Why ‘Smart Passive’?

As a worldwide community we all have a finite resource with which to work. At
USystems we hold sustainability at the heart of our design philosophy.
The CL20 Smart Passive is designed with sustainability in mind, allowing you to plan
for the future without discarding a proven energy efficient solution of today. This
has been achieved by providing a unique upgrade path from a self cooling passive
RDC to a proactively cooled RDC able to fully control both the environment within
the cabinet and the room temperature itself.
Anticipating the next generation computer chip sets, heat load densities are set to
rise in the next few years—will have major ramifications on the decisions you make
today in designing your data centre with an upgrade path allowing for such higher
density equipment.
The Smart Passive enables the installation of a passive solution now, without it be-
coming redundant once there is such a change in new active equipment.
The CL20 Smart Passive is available as a complete cabinet solution and is also com-
patible with the ColdLogik Adaptor frame enabling existing OEM or populated cabi-
nets to be retrofitted on site without disruption.
Smart Passive
From passive to active

The upgrade path has been designed to enable a smooth transition from passive to
active. This is achieved by removing the passive front grille and replacing with the
active module which would initially contain 3 variable speed EC fans which ramp up
and down together in order to provide a reliable airflow across all sections of the
cabinet
Thermistors are positioned within the cabinet which are controlled by the introduc-
tion of the ColdLogik Management System and the system is ready to run.
At this point there is also the option to add in an additional two way valve to more
accurately control the water flow and therefore the returning air to the room ambi-
ent, the CMS has capacity for the specific valve operation included as standard. The
addition of such a 2 way valve can greatly increase the efficiency of inverter driven
pumps on site by reducing the volumetric load required through the coil and still
maintaining the desired room ambient temperature.
The further two upgrades consist of single fan upgrades. This allows for an im-
proved duty that is available from the door whilst still maintaining the room tem-
perature required. When these additional fans are added to also become part of
the centrally controlled bank and will respond with all other fans to ensure smooth
performance and maximum efficiency.
Smart Passive with interface frame
Page 14
Upgrade path
Step 1 Step 2
Remove vent panel and top cover Fit fan panel, ColdLogik Management System, fan panels and fan cover
PROS OF UPGRADABLE PASSIVE RDC

Zero running costs – no electrical components
Lower capital cost – No fans, controller or monitoring
Easy Installation – requires only water connection and hanging
Silent running – no external fans
The ColdLogik CL20 Smart Passive uniquely has a modular upgrade path for a ‘pay as you grow’ ethos to counter costly and
wasteful ‘rip out and replace’ upgrades.
CONS OF NON UPGRADABLE PASSIVE RDC
Uncontrolled room environment – Without a controller, fans and monitoring, passive RDC’s cannot precisely control the lo-
cal and general room temperature, not without additional costly cooling equipment, such as CRAC units.
Passive RDC’s do not support energy efficient servers – As passive RDC’s rely upon on the air pressure and volume generated
by the active equipment fans, only aggressive powerful server fans can generate the necessary air pressure and volume to
meet the higher duty requirements.
Undetected hot-spots – Passive RDC’s do not have monitoring capability, therefore hotspots can go undetected, increasing
the likelihood of product downtime, software glitches and hardware failure.
Life before ‘Smart Passive’ – In the event that the incumbent passive RDC’s prove to be insufficient for needs of the datacen-
tre, then the only recourse was to replace the passive RDC with an active RDC or change the adopted cooling philosophy and
replace with a new design, which can be costly and disruptive to operations.
Page 15
Passive performance data 600w
Basic 42Ux600 Smart Passive unit performance table based on active IT equipment in the cabinet producing the follow-
ing assumptive parameters of varying air flow and water temperatures entering and leaving the door
Entering and 14°C-(57°F) 14°C-(57°F) 14°C-(57°F) 14°C-(57°F) 14°C-(57°F) 14°C-(57°F)

leaving water temp 20°C-(68°F) 20°C-(68°F) 20°C-(68°F) 20°C-(68°F) 20°C-(68°F) 20°C-(68°F)
Max Duty
9kW 16kW 23kW 29kW 34kW 39kW
Airflow
1000m³h 2000m³h 3000m³h 4000m³h 5000m³h 6000m³h
Air pressure drop

1.9pa 6.1pa 11.8pa 19.0pa 27.4pa 37.0pa
across coil
Fluid flow 1.3m³h 2.4m³h 3.4m³h 4.2m³h 5.0m³h 5.7m³h

(5.6US GPM) (10.4US GPM) (14.6US GPM) (18.1US GPM) (21.5US GPM) (24.5US GPM)
Fluid pressure
0.89psi 2.54psi 4.57psi 6.89psi 9.13psi 11.61psi
drop
Basic 48Ux600 Smart Passive unit performance table based on active IT equipment in the cabinet producing the follow-
ing assumptive parameters of varying air flow and water temperatures entering and leaving the door

Max Duty
Airflow
1000m³h 2000m³h 3000m³h 4000m³h 5000m³h 6000m³h
Air pressure drop

1.6pa 4.9pa 9.5pa 15.2pa 22.0pa 29.7pa
across coil
Fluid pressure
drop
Page 16
Passive performance data 800w
Basic 42Ux800 Smart Passive unit performance table based on active IT equipment in the cabinet producing the following
assumptive parameters of varying air flow and water temperatures entering and leaving the door

Max Duty
Airflow
1000m³h 2000m³h 3000m³h 4000m³h 5000m³h 6000m³h
Air pressure drop

1.3pa 3.9pa 7.7pa 12.3pa 17.8pa 24pa
across coil
Fluid pressure
1.2 psi 3.4psi 6.3psi 9.43psi 12.97psi 16.66psi
drop
Basic 48Ux800 Smart Passive unit performance table based on active IT equipment in the cabinet producing the following
assumptive parameters of varying air flow and water temperatures entering and leaving the door

Max Duty
Airflow
1000m³h 2000m³h 3000m³h 4000m³h 5000m³h 6000m³h
Air pressure drop

1pa 3.2pa 6.2pa 9.9pa 14.3pa 19.3pa
across coil

(5.6US GPM) (10.75US GPM) (15.5US GPM) (19.8US GPM) (24US GPM) (27.5US GPM)
Fluid pressure
drop
Under the right circumstances and with the correct active equipment in the cabinet, CL20 Smart Passive rear door
coolers can make a tremendous difference to an individual sites efficiency - more commonly referred to as ‘PUE’.
Given this correct design environment in some Data Centres passive doors can make a real difference to the operation.
Page 17
Active performance data 600w
Basic unit plus Upgrade Basic unit plus Upgrade Complete system up-
42U 600w Active
One Two grade
Backward curved centrifugal
3 fans 4 fans 5 fans
IP44 rated EC fans
Maximum Duty 30kW 37kW 44kW
Fluid Flow 4.3m³h /19.33 USGPM 5.4m³h /23.77 USGPM 6.3m³h /27.9 USGPM
Pressure drop 7.11psi 10.59psi 14.10psi
Water Supply 14c/57f 14c/57f 14c/57f
Max air flow 4200m³h /2472cfm 5600m³h/3296cfm 7000m³h/4120cfm
Start up current 3.5A 5.5A 6A
Max running current 2.9A 4A 5.1A
Basic unit plus Upgrade Basic unit plus Upgrade Complete system up-
48U 600w Active
One Two grade
IP44 rated EC fans
Maximum Duty 31.8kW 39kW 46kW
Power Consumption—all active models
25% 189w 237w 285w
50% 325w 417w 510w
75% 512w 667w 822w
100% 761w 1000w 1239w
Page 18
Active performance data 800w
Basic unit plus Upgrade Basic unit plus Upgrade Complete system
42U 800w Active
One Two upgrade
IP44 rated EC fans
Maximum Duty 32kW 42kW 50kW
Basic unit plus Upgrade Basic unit plus Upgrade Complete system
48U 800w Active
One Two upgrade
IP44 rated EC fans
Maximum Duty 33kW 43kW 50.5kW
An active CL20 door is up to 90% more efficient operationally than a traditional CRAC system
Where the CL20 Smart Passive really excels is the flexibility the upgrade path can provide in a typical data
centre environment. Through a variety of methods, whether through a ‘Pay as you grow’ methodology
which would allow you to incrementally upgrade the door over periods of time in reaction to increases in
duty, or though an efficiency drive to see if the passive will suffice before upgrading should the need arise -
ensuring the highest possible efficiency.
Page 19
CL20 Smart Passive Dimensions
ColdLogik CL20 Smart Passive door 600w
Height 42U 48U

Depth 6.18”/157mm 6.18”/157mm
Width 23.6”/600mm 23.6”/600mm
Weight (dry) 109.12lb/49.6kg 124.39lb/56.54kg
Weight (wet) 120.1lb/54.6kg 136.92lb/62.24kg
ColdLogik CL20 Smart Passive active upgrade 600w

Height 42U 48U
Depth 12.24”/311mm 12.24”/311mm
Width 23.6”/600mm 23.6”/600mm
Weight (wet) 175.13kg/79.6kg 199.65lb/90.75kg
Pipe Connections 1”/25mm 1”/25mm
Volume capacity 1.29 US gallons/5 L 1.47 US gallons/5.7 L
Smart Passive
ColdLogik CL20 Smart Passive door 800w
Height 42U 48U
Depth 6.18”/157mm 6.18”/157mm
Width 31.5”/800mm 31.5”/800mm
Weight (wet) 160.2lb/72.8kg 182.6lb/83kg
ColdLogik CL20 Smart Passive active upgrade 800w
Height 42U 48U
Depth 12.24”/311mm 12.24”/311mm
Width 31.5”/800mm 31.5”/800mm
Weight (dry) 211.50lb/96.14kg 241.12lb/109kg
Weight (wet) 226.02lb/102.74kg 256.52lb/116.60kg
Pipe Connections 1”/25mm 1”/25mm
Volume capacity 1.72 US gallons/6.7L 1.96 US gallons/7.6 L
Smart Passive—upgrade
Page 20
CL20 Interface frame
One of the biggest advantages of the CL20 Rear Door Cooler is its
ability attach to a USystems cabinet or another manufacturers
cabinet via an interface frame.
The interface frame is a universal product, so all standard and some

nonstandard enclosures can be accommodated. It allows a secure
fixing of the rear cooler without transferring any additional weight
to the existing cabinet.
The frame brings many of the benefits of the CL20 cooler family
without the need to decommission old cabinets – or even entire
data centres.
By working in harmony with the incumbent air conditioning system,

many of the benefits of the ColdLogik system can be realised:
• Removal of hot spots.
• Increase cabinet kW density – and data centre density by

housing more active equipment.
• Reduce carbon footprint.
• Save HVAC energy.
• Save energy costs.

The CL20 interface frame fitted
NB. Standard recognisable manufacturers racks can be to a data cabinet
accommodated without feet, castors or plinths. If these are used, a
CAD step file would be required of the rack to enable us to design a
made to order interface frame.
Standard sizes
42U x 600/750/800 (23.62”/29.53”/31.50”)
48U x 600/750/800 (23.62”/29.53”/31.50”)
Other non standard sizes are available
The CL20 ColdLogik Rear

Door Cooler
Page 21
ColdLogik Management System (CMS)
The ColdLogik Management System (CMS) lies at the heart of the

ColdLogik solution.
The room ambient temperature is controlled locally at cabinet level by

the CMS. It automatically adjusts the fan speed, water flow rate and, if
necessary, the output water temperature from the cooling medium
chiller the result is a consistent delivery of cooled air into the data
centre, with no operator intervention.
The whole process can also be overseen and controlled at individual

cabinet level, room level and remotely via any of the industry standard
communication protocols.
The CMS is built into the cooler. It ensures all variants of the ColdLogik
system operate on a ‘sensible cooling’ principle – ‘water above dew
point’ – and the system remaining free of condensation. The ColdLogik Management System (CMS)
The ColdLogik Rear Door Cooler is AC powered in the range 196-253Vac/50-60Hz/12.5A (max) and can be wired Phase
to Neutral or Phase to Phase thus covering most configurations. Phase to Neutral or Phase to Phase must be specified
at the time of ordering. Dual supply (A&B) is incorporated as standard—the system has internal switchover and alarm
functions.
A separate protective earth connection must be provided. The site must provide an appropriately rated single pole
disconnect per door (either MCB or Contactor) for Phase to Neutral systems, and a dual pole disconnect for Phase to
Phase systems so that both break simultaneously. Maximum rating 20A.
In order to better serve our customers we now offer both of these options on the CMS system.
Please see below a brief and basic explanation on the power scenarios typically found where the CMS box is installed.
Page 22
The ColdLogik Management System (CMS) is configurable to suit each installation and includes these functions:
• Coolant flow control (0 to 10V)
• Integral 24V AC motorised valve supply
• 0 to 10V EC fan control
• Industry standard thresholds and differentials on all user definable parameters
• Valve (coolant) position
• Individual fan monitoring
• Communication protocols Modbus, TCP/IP and RS-485, optional SNMP and BACnet protocols
• Network BMS or volt free contact connections for room monitoring 50+ alarms, including individual fan fail
alarm and a common alarm
• Local door alarm indicator – colour change on door logo.
• High and low temperature alarm
• Full alarm log (requires commissioning tool to access and reset).
• User definable time delays on alarm functions
• Automatic dual supply change over
• Power fail alarm on supply change over.
Options:
• Leak detection alarm.
• Chiller regulation based on room values and set point
• Power monitoring
• Processor monitor fail safe
• Local individual cabinet display screen
• System display monitor and log up to 300 CMS via the RMS
• Set up/commissioning tool
Page 23
ColdLogik Room Management System (RMS)
The ColdLogik solution may be supplied with an optional Room Management System (RMS). The Unit can
be fitted in or outside of the DC at the entrance to the data hall for instance, monitoring the operational
condition of the DC or any individual connected item.
It is designed to provide ‘all’ details of the ColdLogik Data Centre cooling, interfacing before the Building
Management System, but working with any BMS installed (Modbus, TC/IP protocol).
The RMS uses Modbus over TCP/IP communication to access information from each ColdLogik unit (CMS -
ColdLogik Management System – built into each cooler).
The RMS has IP address (Network port), six USB ports and options to upgrade the built-in software with vari-
ous ‘control or logic’ options. The unit is “bare” until the ColdLogik installation data is programmed in.
User interface provides:
• A list of all devices including—In row Coolers, Rear Door Coolers, External plant, LPS
• Monitoring & logging of alarms – both active and cleared
• Monitoring of parameter changes including a log of changed details
• Logging of actual system parameters
• Output of history/logged information
• Different alarm priorities with e-mail alarm output
• Remote access via network or independent SIM/router (as an option)
• BMS output Modbus via TCP/IP – BACnet client and BACnet server available as options
• Parameter changes (including alarm reset) via password protected access
The entry level ColdLogik RMS monitor.
It can monitor up to 100 devices.
300 device option is also available
Page 24
The ColdLogik Room Management System (RMS) is the complete and reliable solution for management,
monitoring and optimisation of data centre cooling. It may work with a BMS providing more detailed in-
formation and allowing greater in-depth management of the ‘white space’ within the Data Hall.
Modbus TCP/IP connection to the ColdLogik coolers as standard.
Secure remote access is also available, as an option, allowing USystems to provide both training and sup-
port as required.
A keyboard, mouse and monitor may be attached to the RMS for local access.
The RMS is password protected and allows remote viewing of monitored conditions on the ColdLogik
CMS. Four user types may be configured on the RMS allowing different levels of access to the RMS facili-
ties.
Cooler notifications and alarms may be transmitted by email, SMS or IM as well as being displayed on the
RMS. There are also three no-volts relays for connection to legacy BMS systems, if required.
Customised reports may be created with PDF, CSV or HTML output format.
Parameter changes may be broadcast to individual or multiple cabinets and the RMS can reset concluded
CMS alarms.
100 and 300 device versions are available.
System management on screen (example)
Page 25
CL20 options
Cabinets
ColdLogik compliant cabinets
42U or 48U x 23.62”/600mm, 29.53”/750mm, 31.50”/800mm
wide, 39.37”/1000mm or 47.24”/1200mm deep. These
cabinets have a special cooler direct mounting facility,
AirTech V front door, internally locking side panels and front
and rear mounting angles.
Colour: light grey RAL 7035.
Other non standard sizes are available
ColdLogik anti-recirculation sealing kits

Standard with ColdLogik compliant cabinets, option for OEM
cabinets. Anti-recirculation foam sealing kit – seals gaps in
42U and 48U 23.62”/600mm 29.53”/750mm and
31.50”/800mm wide cabinet to stop recirculation of airflow.
A range of 19” blanking panel options are also available from

USystems to assist with directing airflow.
ColdLogik compliant cabinet
ColdLogik miscellaneous electronic

options/accessories
• Commissioning (set up) tool with RJ11 lead.
• ColdLogik cooler leak detection
• SNMP protocol communications
• BACnet protocol communications
ColdLogik commissioning tool
Page 26
ColdLogik compliant hoses
ColdLogik compliant RDC silicone hoses are manufactured from a mix of galvanised
wire, fabric, rubber and silicone – making them ultra-pliable and with a smaller bend
radius than all other hoses. Their construction helps prevent twisting while still
being extremely flexible.
They are suitable for positive or negative pressure and are supplied in pairs – one
red and one blue in standard lengths of 13’/3.7m.
Hoses are supplied with 1”/25mm male cone to cone fittings with either 1”/25mm
tapered BSP or 1”/25mm tapered NPT brass adaptors for pipe work connections.
ColdLogik CL20 general options and accessories

• Commissioning valves (FODRV/DRV)
• Flow control valve C8 and C12 up to 30 kW.*
• Flow control valve C12 and C14 up to 58 kW.*
• Flow control valve C18 up to 92kW.*
• Various size pipe work adaptors
• Custom length hoses (up to 5m max) ColdLogik compliant

hoses are ultra-pliable.
RDC pipe connections

1.26”/32mm headers with 1.1”/28mm flow and return pipes each with 1”/25mm female cone for hose
attachment.
flow and return pipes female cone tapered BSP tapered NPT
* Flow control valves may be standard 2-way ball valve or Electronic

Pressure Independent Control (EPIC) with flow reading.
Page 27
C l i m ate c ha nge — c l im ate co ntro l
created by
Putting our planet first
USystems Limited,
EMEA, Systems House, 235 Ampthill Road, BEDFORD MK42 9QG United Kingdom
Tel: +44 (0) 1234 761 720 sales@usystems.co.uk
USystems Inc.
NORTH AMERICA , 10 Glenlake Parkway, Suite 130, ATLANTA Georgia 30328 USA
+001 214 307 6033 sales@usystems.com
USystems Limited
Systems House, 235 Ampthill Road, Bedford MK42 9QG England
T +44 (0) 1234 761 720 E sales@usystems.co.uk W www.usystems.co.uk
May 2020 Issue 04
Page 28

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ColdLogik

CL20 Rear Door Cooler

ColdLogik Rear Door Coolers are the award winning data

In 2013/2014, two major UK data centres, where ColdLogik is

We are also in the unrivalled position of having two top 10

Since then, we have gone on to sell the ColdLogik solution in

Tel: +44 (0) 1234 761 720 sales@usystems.co.uk

+1 214 307 6033 sales@usystems.com

Single source solution

Exit air returned to data centre at

Coil removes heat at

Active equipment air

Overview and principle

ColdLogik Room Management System – RMS

River, sea, lake

CL20 rear cooler

CL20 rear cooler

Options for Aisle Cooling Distribution

External cooling options

Consequentially, free cooling can be obtained from

Cooling Distribution Unit (CDU)

The waste heat generated by active equipment within a cabinet is removed at

Power usage effectiveness (PUE)

A few examples of performance achieved on ColdLogik installed sites

CL20 C8 Rear Door Coolers

CL20 C8 Rear Door Cooler—Liquid cooled

CL20 C12 Rear Door Cooler—Liquid cooled

CL20 C14 Rear Door Coolers

Power requirement See page 12

CL20 C14 Rear Door Cooler —Liquid cooled

Other sizes available on request

Weight - dry 176lb/79.8kg

CL20 C18 Rear Door Cooler —Liquid cooled

Power requirements for five fan doors

ColdLogik Rear Door Cooler Current Draw Readings

30%/1255cfm 1.9A/390w 1.7A/352w

35%/1463cfm 2A/410w 1.8A/370w

40%/1672cfm 2.2A/440w 2.0A/347w

45%/1881cfm 2.3A/480w 2.1A/434w

50%/2090cfm 2.5A/510w 2.3A/461w

60%/2509cfm 2.8A/570w 2.6A/515w

70%/2927cfm 3.3A/680w 3.0A/614w

80%/3345cfm 4A/829w 3.6A/750w

90%/3763cfm 4.7A/976w 4.4A/882w

100%/4181cfm 5.1A/1269w 4.7A/1147w

Phase to Phase Phase to Neutral

ColdLogik Rear Door Cooler Current Draw Readings

30%/1505cfm 1.8A/375w 1.6A/339w

35%/1756cfm 2A/416w 1.8A/376w

40%/2007cfm 2.3A/478w 2.1A/432w

45%/2258cfm 2.6A/541w 2.4A/489w

50%/2509cfm 2.9A/603w 2.7A/545w

60%/3011cfm 3.5A/728w 3.2A/658w

70%/3513cfm 4.3A/895w 3.9A/804w

80%/4015cfm 5.1A/1061w 4.7A/959w

90%/4516cfm 6.1A/1269w 5.5A/1147w

100%/5018cfm 7.1A/1477w 6.4A/1335w

Phase to Phase Phase to Neutral