AIREDALE LogiCool InRak User manual

LogiCool InRak™
Technical Manual
EMS52086FM00542
• Direct Expansion
• Chilled Water
• Dual Circuit Chilled Water

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Customer Services
Warranty, Commissioning & Maintenance
As standard, Airedale guarantees all non consumable parts only for a period of 12 months, variations tailored to suit
product and application are also available; please contact Airedale for full terms and details.
To further protect your investment in Airedale products, Airedale can provide full commissioning services,
comprehensive maintenance packages and service cover 24 hours a day, 365 days a year (UK mainland).
For a free quotation contact Airedale or your local Sales Engineer.
All Airedale products are designed in accordance with EU Directives regarding prevention of build up of water,
associated with the risk of contaminants such as Legionella.
For effective prevention of such risk it is necessary that the equipment is maintained in accordance with Airedale
recommendations.
SafeCool
In addition to commissioning, a 24 hour, 7 days a week on-call service is available throughout the year to UK mainland
sites. This service will enable customers to contact a duty engineer outside normal working hours and receive
assistance over the telephone. The duty engineer can, if necessary, attend site, usually within 24 hours or less.
Full details will be forwarded on acceptance of the maintenance agreement.
CAUTION
Warranty cover is not a substitute for maintenance. Warranty cover is conditional to maintenance being carried out
in accordance with the recommendations provided during the warranty period. Failure to have the maintenance
procedures carried out will invalidate the warranty and any liabilities by Airedale International Air Conditioning Ltd.
Spares
A spares list for 1, 3 and 5 years will be supplied with every unit and is also available from our Spares department on
request.
Training
As well as our comprehensive range of products, Airedale offers a modular range of Refrigeration and Air Conditioning
Training courses, for further information please contact Airedale.
Customer Services
For further assistance, please e-mail: [email protected] or telephone:
UK Sales Enquiries + 44 (0) 113 239 1000 [email protected]
International Enquiries + 44 (0) 113 239 1000 [email protected]
Spares Hot Line + 44 (0) 113 238 7878 [email protected]
Airedale Service + 44 (0) 113 239 1000 [email protected]
Technical Support + 44 (0) 113 239 1000 [email protected]
Training Enquiries + 44 (0) 113 239 1000 [email protected]
For information, visit us at our web site: www.airedale.com

EN378-1 :2008 (100 year life)
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Health and Safety
IMPORTANT
The information contained in this manual is critical to the correct operation and maintenance of the unit and should be
read by all persons responsible for the installation, commissioning and maintenance of this Airedale unit.
Safety
The equipment has been designed and manufactured to meet international safety standards but, like any mechanical/
electrical equipment, care must be taken if you are to obtain the best results.
CAUTION
When working with any air conditioning units ensure that the electrical isolator is switched off prior to servicing or repair
work and that there is no power to any part of the equipment.
Also ensure that there are no other power feeds to the unit such as re alarm circuits, BMS circuits etc.
Electrical installation commissioning and maintenance work on this equipment should be undertaken by competent and
trained personnel in accordance with local relevant standards and codes of practice.
The refrigerant used in this range of products is classied under the COSHH regulations as an irritant, with set
Workplace Exposure Levels (WEL) for consideration if this plant is installed in conned or poorly ventilated areas.
A full hazard data sheet in accordance with COSHH regulations is available should this be required.
Personal Protective Equipment
Airedale recommends that personal protective equipment is used whilst installing, maintaining and commissioning
equipment.
Refrigerant Warning
The Airedale LogiCool InRak unit uses R410A refrigerant which requires careful attention to proper storage and handling
procedures.
Use only manifold gauge sets designed for use with R410A refrigerant. Use only refrigerant recovery units and cylinders
designed for high pressure refrigerants.
R410A must only be charged in the liquid state to ensure correct blend makeup.
The refrigerant must be stored in a clean, dry area away from sunlight. The refrigerant must never be stored above
50°C.
Global Warming Potential
R410A = 1900
Manual Handling
Some operations when servicing or maintaining the unit may require additional assistance with regard to manual
handling. This requirement is down to the discretion of the engineer.
Remember do not perform a lift that exceeds your ability.

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Environmental Considerations
Freeze Protection
Airedale recommends the following actions to help protect the unit during low temperature operation. This also includes
the units subject to low ambient temperatures. The Logicool InRak must have a minimum of 20% glycol as standard.
Units with supply water temperatures below +5°C
Glycol is recommended when a supply water temperature of +5°C or below is required or when static water can be
exposed to freezing temperatures.
Units subject to ambient temperatures lower than 0°C
Glycol of an appropriate concentration (1) must be used within the system to ensure adequate freeze protection.
Please ensure that the concentration is capable of protection to at least 3°C lower than ambient.
Water/glycol solution should be constantly circulated through all waterside pipework and coils to avoid static water from
freezing.
Ensure that pumps are started and running even during shut down periods, when the ambient is within 3°C of the
solution freeze point (1) (i.e. if the solution freezes at 0°C, the pump must be operating at 3°C ambient).
Additional trace heating is provided for interconnecting pipework.
(1) Refer to your glycol supplier for details.
Environmental Policy
It is our policy to:
• Take a proactive approach to resolve environmental issues and ensure compliance with regulatory requirements.
• Train personnel in sound environmental practices.
• Pursue opportunities to conserve resources, prevent pollution and eliminate waste.
• Manufacture products in a responsible manner with minimum impact on the environment.
• Reduce our use of chemicals and minimise their release to the environment.
• Measure, control and verify environmental performance through internal and external audits.
• Continually improve our environmental performance.
CE Directive
Airedale certify that the equipment detailed in this manual conforms with the following EC Directives:
Electromagnetic Compatibility Directive (EMC) 2014/30/EU
Low Voltage Directive (LVD) 2014/35/EU
Machinery Directive (MD) 89/392/EEC version 2006/42/EC
Pressure Equipment Directive (PED) 97/23/EC
Article 13 of 2014/68/EU
To comply with these directives appropriate national & harmonised standards have been applied. These are listed on the
Declaration of Conformity, supplied with each product.
Airedale Ltd endeavours to ensure that the information in this document is correct and fairly stated, but none of the
statements are to be relied upon as a statement or representation of fact. Airedale Ltd does not accept liability for any
error or omission, or for any reliance placed on the information contained in this document. The development of Airedale
products and services is continuous and the information in this document may not be up to date. It is important to check
the current position with Airedale Ltd at the address stated. This document is not part of a contract or licence unless
expressly agreed. No part of this document may be reproduced or transmitted in any form or by any means, electronic
or mechanical, including photocopying, recording, or information storage and retrieval systems, for any purpose other
than the purchaser’s personal use, without the express written permission of Airedale Ltd.
© 2016 Airedale International Air Conditioning Limited. All rights reserved. Printed in the UK.

Customer Services 2
Health and Safety 3
Manual Handling 3
Environmental Considerations 4
Freeze Protection 4
Environmental Policy 4
Speciers Guide 7
Nomenclature 7
Introduction 7
Standard and Optional Features 8
Unit Overview 10
Front Door Assembly 12
Rear Door Assembly 13
Optional Features 13
Packaging 13
Cooling Mode - Chilled Water Cooling (C0) 14
Cooling Mode - Direct Expansion Cooling (DX) 15
Electrical 17
Controls 18
Technical Data - Direct Expansion 22
Operating Limits 22
Performance Data - Single Compressor (X1) 23
Performance Data - Tandem Compressor (X2) 24
Mechanical Data - Single Compressor (X1) 28
Electrical Data - Single Compressor (X1) 29
Mechanical Data - Tandem Compressor (X2) 30
Electrical Data - Tandem Compressor (X2) 31
Sound Data - (X1 / X2) 32
Technical Data - Chilled Water 33
Operating Limits 33
Performance Data - (C0) 34
Mechanical Data - (C0) 38
Electrical Data - (C0) 39
Sound Data - (C0) 40
Unit Pressure Drops (C0) 41
Unit and Solenoid Valve Pressure Drops (C0) 41
Technical Data - Dual Circuit Chilled Water 42
Operating Limits 42
Performance Data - (CC) 43
Mechanical Data - (CC) 48
Electrical Data - (CC) 49
Sound Data - (CC) 50
Unit Pressure Drops (CC) 51
Unit and Leak Isolation Pressure Drop (CC) 51
Contents
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Installation 52
Dimensions 52
Unpacking and Lifting 53
Positioning 54
Levelling 55
Incoming Services 56
Electrical Services Incoming Cabling 59
Interconnecting Wiring 60
Refrigeration Pipe work 62
Refrigerant Pipe Sizing Guide 62
Oil Charging Guide 67
System Refrigerant Charging 68
Breaking the System Vacuum 68
Operation Checks 68
Evaporator Superheat 68
Condenser Liquid Drain Subcooling 68
EEV Subcooling 68
Oil Sump Temperature 68
Pipework Schematics 69
Commissioning 75
Maintenance 77
General Inspections 78
Electrical Inspection 79
Refrigeration 80
Waterside 81
Controls 82
System 83
Troubleshooting 84
General Faults 84
Alarms 86
Alarm Menu Display 86
Alarms 87
Contents
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Speciers Guide
Nomenclature
LogiCool InRak
LIR
LIR 60 42U X2 50 0
Case Width (mm x 10 = 600)
60
42U Case Height
X2
C0
CC
X1
Single Circuit, Tandem Compressor
Single Circuit, Single Compressor
Single Circuit, Chilled Water Cooling
Dual Circuit, Chilled Water Cooling
400 V / 3PH /N/ 50Hz
380V / 3PH /N/ 60Hz
Cooling Capacity (kW)
50
0
1
Example
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Introduction
The LogiCool InRak is an efcient in-row IT cooling solution for data centre applications.
The InRak delivers complete condence, with redundancy features such as hot swappable fans and dual power
supplies. It is extremely efcient, offering the latest fan technology coupled with sophisticated controls logic designed to
optimise operation.
The InRak delivers even greater efciency when combined with Airedale’s latest free cooling chillers.
Providing industry-leading cooling for its footprint, the InRak offers the ultimate in scalable solutions for the modern data
centre. The InRak is designed to t in between industry standard server racks and offer “plug and play“ connectivity.
The InRak is available for 50 Hz and 60 Hz power supplies as follows:-
X1 X2 C0 CC
400 V / 3PH / 50 Hz Supply ● ● ● ●
380 V / 3PH / 60 Hz Supply ●–● ●
Construction
The cabinet shall be manufactured with galvanised sheet steel to provide a smooth aesthetically pleasing nish. The
galvanised sheet steel panels shall be coated with an epoxy baked powder paint to provide a durable nish.
Standard unit colours shall be Black Grey (RAL 7021) or Light Grey (RAL 7035).

C0 CC X1 X2
Door
Hot Swappable Fan Assembly ●●●●
Independent Fan Isolation ●●●●
Discharge Grille ●●●●
Removable Access Panel ●●●●
Secure Door Locks ●●●●
Return Air Grille ●●●●
Mains Isolator ●●●●
G4 Return Door Air Filter ○○○○
Levelling Feet ●●●●
Castors ●●●●
Anti-Recirculation Brush Seal ●●●●
Electrical
Electrical Switch Gear ●●●●
Door Electric Isolator ●●●●
Controller Capacitive Backup ●●●●
Energy Manager ○○○○
Phase Rotation Monitoring ○○○○
Thyristor Controlled Electric Heat ○○○○
IEC 60309 Plug and Socket ○○○○
Dual Power Change Over Switch ○○○○
Standard and Optional Features
●Standard Feature ○ Optional Feature – Not Avaliable
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Standard and Optional Features
C0 CC X1 X2
Controls
Microprocessor Control ●●●●
Graphical Display ●●●●
Unit Status LED ●●●●
Dew Point Control ●●●●
Filter Change Monitoring ○○○○
Touch Screen Display ○○○○
Rack Pressure Management ○○○○
Dynamic Air Volume Control ○○○○
Water Detection ○○○○
Fire / Smoke Detection ○○○○
Refrigerant Leak Detection – – ○ ○
Chilled Water
Efcient Chilled Water Coil ● ● – –
Bleed / Drain Valves ● ● – –
Modulating Control Valves ● ● – –
3 Way Chilled Water Valve ○ ○ – –
2 Way Chilled Water Valve ○ ○ – –
Chilled Water Isolation ○ ○ – –
Chilled Water Solenoid Valve ○ ○ – –
Refrigeration
Efcient Fixed Speed Scroll Compressor –––●
Efcient EC Inverter Scroll Compressor – – ● ●
Electronic Expansion Valve – – ● ●
Refrigeration Sight Glass – – ● ●
Oil Separator – – ● ●
Liquid Line Solenoid Valve – – ● ●
Refrigerant Pump down – – ○ ○
●Standard Feature ○ Optional Feature – Not Avaliable
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Unit Overview
Standard Front Door Features
•Hot Swappable Fan Assembly
•Independant Fan Isolation
•Discharge Grille
• Removable Access Panel
• Secure Door Lock
Standard Construction Features
• Levelling Feet
•Castors
• Anti-Recirculation Brush Seal
• Side Access Panels
Standard Rear Door Features
• Secure Door Lock
• Return Air Grille
• Mains Isolator
Optional Rear Door Features
• G4 Return Door Air Filter
Standard Electrical Components
•Electrical Switch Gear
•Door Electric Isolator
• Controller UPS Backup
Optional Electrical Components
• Condensate Pump
• Energy Manager
• Phase Rotation Monitoring
•Thyristor Controlled Electric Heat
• IEC 60309 Plug and Socket
Standard Chilled Water Features
• Efficient Chilled Water Coil (Single or Dual Circuit)
• Bleed / Drain Valves
• Modulating Control Valve
Optional Chilled Water Features
• 3 Way Chilled Water Valve
• 2 Way Chilled Water Valve
• Isolating Solenoid Valves
• Bypass Regulating Valve
Standard Refrigeration Features
• Efficient Fixed Speed Scroll Compressor
• Efficient EC Inverter Scroll Compressor
• Electronic Expansion Valve
• Refrigeration Sight Glass
•Oil Separator
• Liquid Line Solenoid Valve
Optional Refrigeration Features
• Refrigerant Pump down
Standard Control Features
•Microprocessor Control
• Graphical Display
• Unit Status LED
• Dew Point Control
Optional Control Features
• Touch Screen Colour Display
• Filter Change Monitoring
• Rack Pressure Management
• Dynamic Air Volume Control
• Water Detection
• Fire / Smoke Detection
• Refrigerant Leak Detection
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Standard Front Door Features
•Hot Swappable Fan Assembly
•Independant Fan Isolation
•Discharge Grille
• Removable Access Panel
• Secure Door Lock
Standard Construction Features
• Levelling Feet
•Castors
• Anti-Recirculation Brush Seal
• Side Access Panels
Standard Rear Door Features
• Secure Door Lock
• Return Air Grille
• Mains Isolator
Optional Rear Door Features
• G4 Return Door Air Filter
Standard Electrical Components
•Electrical Switch Gear
•Door Electric Isolator
• Controller UPS Backup
Optional Electrical Components
• Condensate Pump
• Energy Manager
• Phase Rotation Monitoring
•Thyristor Controlled Electric Heat
• IEC 60309 Plug and Socket
Standard Chilled Water Features
• Efficient Chilled Water Coil (Single or Dual Circuit)
• Bleed / Drain Valves
• Modulating Control Valve
Optional Chilled Water Features
• 3 Way Chilled Water Valve
• 2 Way Chilled Water Valve
• Isolating Solenoid Valves
• Bypass Regulating Valve
Standard Refrigeration Features
• Efficient Fixed Speed Scroll Compressor
• Efficient EC Inverter Scroll Compressor
• Electronic Expansion Valve
• Refrigeration Sight Glass
•Oil Separator
• Liquid Line Solenoid Valve
Optional Refrigeration Features
• Refrigerant Pump down
Standard Control Features
•Microprocessor Control
• Graphical Display
• Unit Status LED
• Dew Point Control
Optional Control Features
• Touch Screen Colour Display
• Filter Change Monitoring
• Rack Pressure Management
• Dynamic Air Volume Control
• Water Detection
• Fire / Smoke Detection
• Refrigerant Leak Detection
Unit Overview
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Front Door Assembly#
Standard Features
EC Fan motor
310mm diameter backward curved centrifugal fans with EC motors mounted with
inlet ring shall be provided to ensure optimum efciency.
The fan section shall be designed as a hot swap assembly which can be changed
quickly minimising downtime during replacement or maintenance. The assembly
incorporates a fan isolation switch to interrupt power before removal.
N+1 Fan Redundancy
The InRak has the option for N+1 redundancy. This runs the unit at 75% airow
under normal conditions. If a fan fails the remaining healthy fans speed up to
100% achieving the full design airow.
Optional Features
Condensate Pump
The following graphs illustrate the TOTAL static (head) pressure available. The system horizontal pipe losses and
vertical lift should be factored in when calculating the condensate pump performance.
IMPORTANT
Use only 10mm (3/8”) copper tube when connecting the discharge stub to the condensate pump. The discharge line
from the pump should rise no more than 6 metres vertically and no more than 8 metres in total length before being
interrupted with a swan neck air break and tundish.
0
2
4
6
8
10
12
14
026 8 10 12 14
4
16
18
Head / metre
Litres / min

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Packaging
For specic markets units shall be shipped, mounted on wooden pallet and covered with polythene. The pallet shall be
mechanically xed to the unit for transportation only.
Optional Features
Sterling Board LAT (Wooden Case) Packing
Units shall be supplied complete with additional LAT corner protection and cross braces to afford extra transit protection.
Sterling board heat treated man made material shall be used (including pallet) to comply with phytosanity import
regulations (please contact Airedale for this option).
Rear Door Assembly
Standard Features
G4 ltration
The unit shall be tted with G4 Filtration.

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Cooling Mode - Chilled Water Cooling (C0)
Standard Features
Chilled Water Coil
3/8” plain tube cooling coil with 1.8 mm n pitch and hydrophilic ns.
Dependant on model the coil shall be single (C0) or dual circuit (CC).
Bleed and Drain Valves
Valves shall be factory tted to easily bleed the system of any air and drain water for maintenance.
Bypass Regulating Valve
A bypass regulating valve shall be tted in the bypass leg of the system to enable constant ow when there is no cooling
demand. This simulates the coil pressure drop ensuring that the water ow rate does not change irrespective of the ow
through the chilled water coil.
This enables ow through each cooling module without the need for a Cooling Distribution unit (CDU).
Optional Features
0-10 Volts DC Chilled Water 3 Way Valve
A 0-10 VDC chilled water 3 way regulating valve shall be tted. This shall be used
to govern the chilled water ow to the coil when there is a demand for cooling.
0-10 Volts DC Chilled Water 2 Way Valve
A 0-10 VDC chilled water 2 way regulating valve shall be tted.
This shall be used to govern the chilled water ow to the coil when there is a
demand for cooling.
Isolating Solenoid Valves (C0 Only)
Isolating solenoid valves shall be tted to the inlet and outlet connections. This
shall control the water ow to and from the cooling module in the event of fault
or power failure. The valves have a low pressure drop and are fast acting. The
valves shall be Normally Closed (NC) operation.
Leak Isolation Valve (CC Only)
A combination of the chilled water valve and a non return valve shall be tted to
ensure water isolation in the event of fault or power failure. The valve has a low
pressure drop and fast acting.

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Cooling Mode - Direct Expansion Cooling (DX)
Single EC Inverter Driven Compressor
Comprising of an EC inverter driven scroll compressor which provides variable control of the system performance, by
adjusting its speed. This output allows external load demands to be met with greater precision, eliminating unnecessary
temperature and humidity variations. Consequently, system efciency and reliability are much improved by extending
major component working hours.
Tandem EC Inverter and Fixed Speed Compressors
Combining a xed speed compressor and EC inverter driven scroll compressor provides a more exible variable control
of the system performance, by adjusting one compressors speed.
This output allows greater external load demands to be met than with the single inverter option with greater precision,
eliminating unnecessary temperature and humidity variations.
Consequently, system efciency and reliability are much improved by extending major component working hours.
Electronic Expansion Valves (EEV)
Electronic expansion valves differ to the traditional thermostatic expansion valves in their ability to maintain control of the
suction superheat at reduced head pressures. This can lead to signicant energy savings particularly at reduced loading
and low ambient temperatures.
Heat of Rejection
Reduction in
Compressor Input
Power
Enthalpy kJ/kgIncrease in
Cooling Duty
Evaporating
Pressure
Reduced
Condensing
Pressure
Presssure
Bara
Thermostatic Expansion Valve (1)
Electronic Expansion Valve (2)
1
2
3
4
(1) Cooling Cycle @ 22°C ambient with a conventional TEV tted.
(2) Cooling cycle @ 22°C ambient, demonstrating a typical EEV condensing temperature taking full advantage of lower
ambient air temperatures (below 35°C).
1 Compression
2 Condensation
3 Expansion
4 Evaporation

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Refrigeration Components
Standard Features
Oil Separator
Fitted to ensure higher than usual levels of circulatory oil of the variable speed compressor stay within the unit, and are
not lost to external pipe work causing damage to the compressor.
The component is tted in the discharge line of the compressor and used to separate the oil from the unit’s refrigerant.
The separated oil is then fed back into the suction line to ensure adequate amounts return to the compressor.
Sight Glass
A liquid line sight glass is tted to give an indication of the state of the refrigerant within the system. If the sight glass
becomes yellow it is an indication that the lter drier requires changing.
Optional Features
Refrigerant Leak Detection
If the leak detector reaches the alarm set point, a leak alarm will be set and a message displayed. By default after
detecting a leak, the unit will give an alarm but will continue to run normally. This can be changed to give an alarm and
also shut down the unit and isolate it by closing the liquid line solenoid valve.
If pump-down features are present on the unit, it can be set to give an alarm and also pump-down when a leak is
detected.
Indirect Detection
As well as optional direct leak detection the unit also has indirect refrigerant leak detection as standard. This uses
intelligent monitoring in the software to establish if there is a leak.
If all the following conditions are present then a leak alarm will be generated:
• High superheat with the expansion valve fully open and superheat not reducing.
• High discharge superheat.
• Low sub cool.
Pump-down
Pump-down is used to pump all the refrigerant in the circuit into the outdoor coil and contain it there either when a leak is
detected or when the unit turns off. Containing all the refrigerant in one outdoor area is good practice for safety reasons
as well as being the best way of preventing liquid ood-back to the compressor on restart.

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Dual Power Switch
Dual supply for redundancy and backup in the event of mains supply failure
shall be provided. The dual power supply switch ensures that the InRak always
has an incoming power supply.
For the dual power supplies to operate effectively, the incoming power supplies
must have the same voltage and frequency and be within 120° phase angle.
The dual power switch does not provide protection to the external condenser.
Further provision must be made for this.
Electrical
Standard Electrical features include
• Mains Isolator
• MCB’s
• Withdrawable Main Control Panel
Energy Manager
Three-phase compressors can rotate in either direction depending upon
phasing of the power.
Since there is a 50-50 chance of connecting power in such a way as to cause
rotation in the reverse direction, phase rotation is monitored on a digital input
to the controller to prevent start-up of the compressor upon detection of
reverse phase rotation.
The power meter within the InRak products is capable of monitoring many
different electrical parameters:
• Phase Voltages
• Line Voltages
• Phase Currents
• Unit Power
• Unit Power Factor
Thyristor Controlled Electric Heat
Finned electric heating elements complete with auto and manual reset overheat cut-out protection. Standard electric
heating elements are phase balanced for increased efciency. The thyristor control offers precision control between 0 to
100% via the microprocessor
IEC 60309 Plug and Socket
A IEC 60309 plug and socket shall be tted enabling quick connection of power to the unit.
Ultracap UPS
The Ultracap module is an external backup device for the controller. The
module guarantees temporary power to the controller in the event of power
failures and allows for enough time to keep the controller running with time to
change power supplies. The module is made using Ultracap storage capacitors
(EDLC = Electric Double Layer Capacitor), which are recharged independently
by the module.
These ensure reliability in terms of much longer component life than a module
made with lead batteries: the life of the Ultracap module is at least 10 years.
Optional Features

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Controls
Display/Keypad
The display keypad features a simple array of keys to navigate through the in built menus.
With an 8 x 22 character (132 x 64 pixel) screen size, back lit in white for improved contrast, the large screen shall
provide for user friendly viewing and easy status recognition by displaying a combination of text and icons.
The default screen shall show the unit status and room condition (°C/RH %) without the need for interrogation and an
easy to navigate menu structure for further interrogation and adjustment shall be provided.
Chilled Water Valve Position
Cooling Indication
Heating Indication
Fans
Dehumidification
Display Symbols
Display for illustration only.

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Controls
Standard Features
Temperature/ Humidity Sensor
Unit mounted temperature and humidity sensor shall be supplied as standard. This shall be mounted at the inlet side of
the unit monitoring return air conditions.
Water Temperature Sensor
A water temperature sensor shall be tted to the water inlet pipe work.
Tri colour LED for Easy Fault Detection
LED indication for alarm status shall be incorporated in the front face of the InRak unit which signals Healthy, Non
Critical and Critical Alarm respectively (Green, Yellow and Red.)
Optional Features
Flood Detection
Leak detection for the water system, able to report alarm status to the BMS system shall be provided. The unit shall then
be shut down before any damage occurs.
The leak detection tape shall be tted within the base of the unit.
Smoke Detector
Shall be tted into the roof of the unit to shut down the unit and activate the alarm upon sensing the presence of smoke.
Fire Detector
Shall be installed in the return air stream to shut down the unit in the event of an unusually high return air temperature.
Filter Change Monitoring
A lter change software timer is included to record the time since the lter was changed and give an alarm if the time is
exceeded. This must be manually reset when the lters are changed.
Aisle Pressure Management
The InRak shall be tted with Aisle pressure management, which allows the differential pressure across the IT
equipment to be monitored and controlled to achieve:
• Positive air pressure in the cold aisle.
• Negative air pressure in the hot aisle at the server outlet, to prevent backwash of hot air (behind InRak coil guard).
• Controlled differential pressure across the IT hardware so that air is not ‘forced’ through the IT equipment
Dynamic Air Volume
The compressor will maintain the “air off” temperature while the fans control to the air volume as long as the evaporating
temperature remains within the operating band. However, if the evaporating temperature changes beyond the high
or low differential limits, the fans will modulate to bring the evaporating temperature back within the band, up to the
minimum or maximum air volume band limits. If the evaporating temperature changes beyond that, the compressor will
modulate to bring the evaporating temperature back within the control band. The evaporating temperature set point can
be changed in the controls.
The unit will try to maintain the evaporating temperature as close as possible to the set point whilst maintaining the
cooling demand and the air volume.
Note that at 12°C evaporating temperature the inverter will limit the compressor maximum speed to 90rps from 120rps.
This is to protect the inverter against high currents.
Energy Manager
Analysis of system energy consumption can be monitored via a dedicated LCD display. Unit parameters can be adjusted
via the unit microprocessor control to affect energy usage in line with the system need.

LogiCool InRak™ IT Cooling
20
Introduction
InRak™ Technical Manual 7462807 V1.11.0_04_2016
Controls
Lon BMS Connection
The Airedale controllers, using special serial cards, shall be integrated into LonWorks® networks. The RS485 and the
FTT10 standards shall be supported by the LonWorks® serial cards.
The types of LonWorks® serial cards shall be FTT-10A 78 kbs (TP/FT-10) on the LonWorks® network.
pCOWeb
pCOWeb is a new generation of Airedale supervisory plug-in cards which make communicating with an Airedale unit
simply a matter of logging onto the ofce Intranet or via the web.
Based on Ethernet TCP/IP secure technology, pCOWeb shall require no proprietary cabling. It shall have little or no set-
up on site and can be pre-programmed with an IP address prior to dispatch from airedale.
BACnet Protocol
The BACnet protocol option shall be supplied either with a pCOWeb (Ethernet) or pCONet (RS485) interface card.
Modbus/Carel BMS Connection
The Airedale controllers shall be able to communicate directly using the Modbus® protocol.
The Modbus® card shall be a small PCB (60mm x 30mm), which can be plugged into the controller to provide it with the
following protocol support
• Modbus® - JBus slave
• RTU mode (Remote Terminal Unit) with 8 bit encoding and error handling using 16 bit CRC
• Communication standard connection options of RS485 (multipoint) or RS232 (point-point)
• Maximum Baud Rate of 19200
The data communication shall be asynchronous serial, 8 data bits, 2 stop bits and no parity (in total 11 bits/datum).
The data/parameters from the controller shall be represented within Modbus® registers, each register containing
information pertaining to temperatures, pressures, setpoint, status, etc and is available to the site integration company in
a spreadsheet format
Programming Smart Key
A smart key shall be supplied to offer software back-up of the control strategy. The key shall feature simple plug in
operation and allow transfer of software programs from the key to the microprocessor and vice versa. The use of a
service laptop shall not be necessary.
Expansion Board
An expansion board can be added as an option to add up to 4 additional supply or return air temperature sensors to the
unit. These can be placed on server racks adjacent to the unit to give better regulation over the controlled temperature
and help prevent hot-spots occurring on a server rack or within the room.
Constant Pressure Control (CW units)
Constant pressure control is a method of maintaining a pressure differential between the hot and cold aisles by
modulating the fan speed of the InRak unit.
A -100 to +100Pa differential pressure sensor is used to monitor the pressure difference between the aisles (the same
sensor can be easily changed to -50/+50Pa using a jumper connection depending on individual requirements). This
signal is sent back to the InRak unit microprocessor to modulate the fan speed to maintain a target differential pressure
set point of -10Pa (adjustable). The fan speed modulates to maintain the target differential.
In the event of the differential pressure sensor failing, (open circuit), the unit will revert to the xed fan speed (as
commissioned). The xed fan speed can be adjusted in the Manufacturer > Parameters > Evaporator fans menu.
As the pressure difference decreases the fan speed will increase until the pressure difference reaches the set point
again. If the pressure difference was to increase the fans would lower their speed and decrease the pressure difference
back to the set point.