Contec LES-RACK Installation and operating instructions

Verze 6.5.2022
LES-RACK Local Extinguishing System
Operation Manual and Installation Guide
Product name: LES RACK
This manual serves as a product documentation for installation and commissioning of the
LES-RACK, supplied by CONTEG spol. s r.o. This device is only to be used according to
the instructions and under the operational conditions described in this manual. It is advised to
read it thoroughly and keep it at one’s disposal.

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Contents
●GENERAL INFORMATION 4
○GENERAL 4
○USAGE 4
○GENERAL SAFETY REQUIREMENTS 5
○SAFETY 5
○WORKING CONDITIONS 6
○OPERATOR RESPONSIBILITY 6
○USER RESPONSIBILITY 6
●DESCRIPTION 8
○TECHNICAL PARAMETERS 8
○DESIGN 8
○DESCRIPTION 9
■Front Panel 11
■Back panel 11
■Setting input/output devices 12
●Relay outputs 12
●Door sensor switch 14
●External Sounder LED Beacon 15
●Manual extinguishing release button 16
●External dry contact sensors 17
●External temperature monitoring sensor 19
●RS485 20
●WEB INTERFACE OVERVIEW 22
○MENU 22
○STATUS 22
●Status window: 23
○NETWORK 25
○ALARMS 27
○TEMPERATURES 29
○MAIL 30
○OUTPUTS 30
○DATE AND TIME 31
○LOGS 31
○DOWNLOAD 32
○UPLOAD 33
○MODBUS RTU 34
●INSTALLATION AND COMMISSIONING 36
○SHORT DESCRIPTION 36
○SAFETY 36
○DELIVERED PRODUCT CONSISTS OF FOLLOWING PARTS: 37
○INSTALLATION OF THE DEVICE 37
■General assembly steps 40
○SIGNALING 40
■Signaling of error-free and error states 41

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○RECOVERY AND DEVICE SHUT DOWN 42
■Connection and disconnection of backup batteries with sensor testing 42
●EXTINGUISHING 44
●INSPECTION 45
○DEVICE SWITCH OFF 45
○DEVICE OPERATION 45
■General requirements 45
○MAINTENANCE 45
■General requirements 45
○USER INSPECTION 46
■Weekly inspection 46
■Monthly inspection 46
○SERVICE PROVIDER INSPECTION 47
■Annual service inspection 47
■2-year service inspection 47
○LIST OF REPAIRS AND INSPECTIONS PERFORMED BY SERVICE PROVIDER 47
○INSTALLATION AND COMMISSIONING CHECKLIST 49
●PROBLEM SOLVING 50
●SHOP 53
○EXTERNAL PARTS 53
○ACCESSORIES 54

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●GENERAL INFORMATION
○General
LES-RACK is an autonomous, fully automatic fire detection and extinguishing system
designed for a localized fire protection of control, telecommunication and data center cabinets
and other rack enclosures using the 19" racking system, where the device is sited at the top.
It consists of a fully equipped automatic fire detection system, control, evaluation,
communication and extinguishing unit. In the event of device activation, the manufacturer
recommends the inspection of those equipment that have been exposed to the extinguishing.
CONTEG spol. s r.o. company is not responsible for any damage caused to the data carriers.
The extinguishing agent used in the LES-RACK device is FK 5-1-12 and fulfills EN 15004-2
requirements. FK-5-1-12 is a clean, colourless, delicate-odour liquid agent. The extinguishant
is non-corrosive and non-conductive. Unlike carbon dioxide, it does not cause thermal shock
to extinguished objects. It has a density corresponding to 11 times the density of air, Upon
application, no traces of residue are left as it evaporates. It is totally safe for people and the
environment. It is mainly designed for extinguishing A, B, and C group fires, as well as for
extinguishing of electrical circuits with nominal voltage up to 1000V.
Fire detection is ensured using two optical smoke and temperature detectors, built in the LES-
RACK. These are designed in a redundant connection in such a way that false alarms and
errors in the so-called two-sensor dependency are excluded.
The lifespan of the device, excluding the back-up battery, extinguishing agent and pressurized
nitrogen, is 10 years from the year of manufacture. The life of the batteries depends on the
working environment, especially on the working temperature higher than 25°C, and is set by
the manufacturer for 4 years. In general, the higher the temperature, the shorter the battery
life. Product warranty is 2 years from the moment of purchase, considering the right operating
conditions are ensured and regular maintenance is carried out. See the chapter Maintenance.
Functional test of the entire system, including detection, pressure and drive parts of the
equipment should be performed every 12 months. The quality of the extinguishant, battery
capacity and the pressure inside the tanks and their integrity shall be inspected at least once
every 24 months. Each inspection is performed by a person trained by the manufacturer or
authorized distributor.
○Usage
LES-RACK may only be used in accordance with the operating conditions specified in the
technical documentation and operating instructions. If the device is used in a way that is
outside of defined operating conditions, the manufacturer shall not be liable for any damages
caused by such use. All risks imposed by incorrect use are strictly under the operator’s
responsibility. CONTEG spol. s r.o. is also not liable for any damages caused by fire itself
or damages caused by products of combustion. The operator must also carry out regular

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visual and functional checks in accordance with the operating conditions and the maintenance
plan. Maintenance and service must be documented.
The user of the equipment must draw attention to all changes and modifications in the
monitored and protected area or an object that could affect the function or effectiveness of the
LES-RACK fire extinguishing system (e.g. shading the fire nozzle when installing new
equipment, adding or establishing new ventilation holes in guarded area, etc.). Visual and
functional inspections are fully the responsibility of the customer. Other Inspections may only
be carried out by persons trained by the manufacturer/distributor. More in the Inspection
chapter.
○General Safety requirements
Activation of the LES-RACK fire extinguisher can create risks for the user arising from the
natural form of the fire extinguisher itself, or from decomposition products caused by contact
of the fire extinguisher with fire or hot surfaces. The user of the equipment is obliged to
prevent any exposure of the user to the effect of both the fire extinguisher itself and the
decomposition products, especially by observing regular training.
The actuation of a fire extinguisher may be accompanied by a noise loud enough to attract
attention, but not so loud as to result in injury. A fire extinguisher discharged from a device
nozzle at high velocity can flow with sufficient force to move physical objects in or near its
path. Discharged extinguishing agent may cause currents in the protected space sufficient to
set in motion light unsecured objects.
WARNING: Pressure cartridges are part of the device, therefore it is necessary to treat the
device as a pressure device !
○Safety
The equipment described here has been manufactured in accordance with the latest technical
regulation and recognized safety rules and is characterized by a high degree of operational
safety.
However, the device may present a hazard or damage the system or other property if used
improperly or otherwise than intended. The device may only be used in an undamaged and
fully functional state. The instructions for installation, operation and maintenance of this
device contained in this user manual are aimed at correct, safe and error-free operation. Since
applicable regulations may vary around the world, the applicable national regulations and
laws at the place of use must be followed, even if they conflict with the warnings contained in
this user manual.
Particular attention should be paid to the following:
● National regulations for safety and accident prevention.
● National standards and laws, especially with regard to hazard detection systems.
● National regulations for assembly and installation.
● Generally accepted technical principles.
● This user manual including the safety and warning notices contained therein.
● Characteristics and technical specifications of this device.

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If it is suspected that safe operation is no longer possible (e.g. in the event of damage), the
device must be immediately taken out of service and secured against inadvertent re-
commissioning.
NOTE: This "LES-RACK Fire Extinguisher Assembly and Operating Instructions" serves
as working documentation for the installation and commissioning of the equipment.
However, they cannot fully replace training.
○Working conditions
The device is intended for installation in an area protected against weather conditions class
3K3 according to ČSN EN 60721-3-3 with a temperature range of +5°C to +45°C. The
correct function of the device is conditioned by the working position of the device and its
location in a closed, protected space. The working position must always be horizontal, the
control panel of the device must be easily accessible. The device must be placed in the
highest possible place of the protected area. The working capacity of the device is guaranteed
in the temperature range from +5°C to 45°C with a maximum humidity of 85% and in an
environment where moisture condensation does not occur. Checking whether the maximum
permitted temperature has not been exceeded in the Device assembly chapter assembly
chapter.
WARNING: If the temperature of the device exceeds 45°C, there may be an uncontrolled
leakage of fire extinguishing agent through the safety pressure valve. This is a
consequence of the high temperature of the fire extinguisher in the tank, during which a
gradual change of state from liquid to gas can occur. The result is an increase in pressure
in the tank.
○Operator responsibility
The operator undertakes to allow work on/with the LES-RACK active firefighting system
only to persons who are familiar with the basic regulations on occupational safety and
accident prevention. Who have been instructed in the handling of this device and the entire
system and who have read and understood the instruction manual including the safety and
warning notices contained therein.
○User responsibility
Installation, maintenance, inspections and repairs may only be carried out by persons with
appropriate professional qualifications. Such persons are, for example, "individuals
competent in matters relating to hazard detection systems" or "qualified electricians for
hazard detection systems". The applicable national regulations must be observed, especially
with regard to the required qualification, in the country of use.
Furthermore, all individuals working with the equipment undertake to always comply with
the basic regulations on work safety and accident prevention, to familiarize themselves with
the conditions of the object and its environment, the safety concept, the protection system
and, if applicable, the monitoring system of the superior fire detection system before starting
work. He has read and understood the operator's manual, including its safety and warning

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notices. Any questions regarding the instruction manual should be reported immediately to
the appropriate authorized third party or the equipment manufacturer.
NOTE:
● Unauthorized changes and modifications to the device are not permitted and void
any liability of the manufacturer.
● Use only original spare parts.
● We reserve the right to make changes in the interest of technical development
while maintaining the key features of the described type of device, without
modifying this instruction manual.

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●DESCRIPTION
○Technical parameters
Table number 1
LES-RACK parameters:
Value:
AC supply input voltage range
100-240 VAC
Frequency
50-60 Hz
Current at 230V AC
0,5 A
Efficiency
88%
Current at 230V AC
<1mA
Output voltage
Un = 24 VDC
IP
20
Extinguishant container volume
1,8 l
Operating temperature
+5 až +45
Storage temperature without the extinguishant
-40 až +80oC
Relative humidity (non-condensing)
85%
Dimensions (WxHxD)mm –w/o the nozzle
482x45x602mm
Weight without the extinguishant
14,7 kg
○Design
The casing of the device is made of steel sheet metal. The extinguishant container and the
piping are made of stainless steel and other non-corrosive materials. All materials have been
tested and correspond with the described operating conditions and the extinguishant used and
are to last throughout the lifespan of the device.
All metal components of the casing are finished with black polyester powder coating (RAL
9005). Minimal thickness of the coating is 60 µm. The resistance to separation corresponds to
class 1 according to ISO 2409. The surface should not contain any defects, like scratches,
excess paint, dirt etc.
The inside of the device, including the component placement is shown in the Figure no.1

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○Description
Figure number 1 –Product desccription
The fire extinguishing unit is composed of:
●The fire extinguisher tank (1) consists of a stainless steel non-pressurized
rectangular storage container (1), filled with fire extinguisher (FK-5-1-12,
dodecafluoro-2-methylpentan-3-one). The volume of the tank is 1.8 l, i.e. approx. 2.7
kg of fire extinguisher.
●The level gauge (2) is used to continuously check the amount of fire extinguisher in
the tank. When the level drops below the set limit, the "System fault" signal lights up.
At the same time, this status can be monitored over the network.
●The pressure relief valve (3) is used to protect the device in the event of a
malfunction and overheating of the tank above the permitted temperature limit, when
gasification of the fire extinguisher may occur already in the tank.

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●Compressed nitrogen in the pressure cartridge (4) when extinguishing is started
after opening the electromagnetic valve (5), the reduced pressure will be released and
the fire extinguisher will be pushed out of the tank. The extinguishing agent is then
directed through the open electromagnetic valve (6) and the nozzle (7) and dispersed
under pressure into the protected space.
●The pressure switch (8) is used to check the pressure in the pressure cartridges.
●The bulit-in detectors (9) are stored in the left rear part of the cabinet. It is a
combination of temperature and optical smoke detection. Air is slowly sucked into the
detectors by an auxiliary fan (10).
●Backup battery Un (11) is used to back up the system in the event of a power failure
or DC source failure. The battery capacity will fully cover the energy requirements of
the system during extinguishing for a maximum of 4 hours, however, the time is not
guaranteed throughout the life of the device due to the decreasing life of the batteries.
More in the category Connecting and disconnecting backup batteries
●The AC connector (12) is used to connect the DC source (13) to the 230V AC
distribution network.
●The control board (14) concentrates and evaluates data from all inputs and sensors.
The operation of the entire system is then controlled based on the results.
●The manual control and local signaling board (15) is used for manual control,
control and detection of the system status. Unequivocal indication of device status
using LED elements on the front panel reports any current combination of device
functional states. More in the Singaling chapter.
●The board of external inputs and outputs (16) ensures the collection of signals from
external safety elements and the control of auxiliary devices of the system using
internal relays. At the same time, it enables the connection of 4 potential-free relay
outputs. More in the chapter Setting input/output devices. Setting input/output
devices.

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■Front Panel
The device can be controlled locally using the elements on the front panel or remotely using
the network connection also on the front panel.
The layout of control elements and signal diodes on the front panel is shown in Fig. no. 2.
All control elements and signal diodes are marked with a functional description - functional
label. More in the Singaling chapter..
Figure number 2 –Front panel
■Back panel
On the back panel, the input/output terminal block is equipped with 4 relays for controlling
external devices, connectors for connecting signals from external safety elements and
connectors for switching external devices. All connectors are marked with a function label.
More in the chapter Setting input/output devices.
The layout of the individual connectors is shown in Fig. no.: 3 and 4
Figure number 3 –Back panel
Back-up battery connections switch
Back-up battery disconnection. Located on the bottom side of the panel, apx. 1,5cm
from the left edge and 4cm from the front

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Figure number 4 - Description of the terminal board for connecting Input/Output devices
■Setting input/output devices
For any changes to the software settings, see below, you also need to restart the device after
saving (Main Menu -> Upload -> Reset).
Figure number 5 - Upload
For the software settings, see Getting to know the web interface chapter.
●Relay outputs
The LES-RACK is equipped with 4 SPDT relay outputs, one of which is DPDT switch
(Double Pole Double Throw Switch). Separate activation of the relay can be set up by the
user. It is also possible to activate relays during testing. „TEST“ (Alarms -> Select alarm 20
Test).
The software setting of the relay can be done in the Outputs main menu after logging into the
web interface.
The maximum switching voltages and currents are listed in Table No. 2.
Software settings chapter Outputs.

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Figure number 6 - Switching settings and relay name
Table number 2
Síť:
Umax
Imax / Un
AC
60V
0,5
DC
24V
0,5
NOTE: These outputs can be used, for example, to connect a GSM module, where one of
the outputs will be switched on in the event of a fault (Alarms -> Select alarm: 22
Minor/23 Major) and the other in the event of fire detection and extinguishing (Alarms -
> Select alarm: 25 Extinguishing).
Figure number 7 –Minor alarm setting

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Figure number 8 –Setttings of alarm extinguishing function
●Door sensor switch
Prevents extinguishing to discharge when the door is open. Opening the door turns on the
door switch and this deactivates the extinguishing. The reason is that with the door open, the
extinguishing agent would not reach the required concentration inside the cabinet. The
integrity of the contact circuit is constantly monitored.
The wiring diagram for the door contact is shown in Figure no. 10.
When the extinguishing is blocked, the „EXTINGUISHING” indicator on the front panel
lights up yellow
The door sensor switch must be first set, after connecting to the web interface in the menu
Alarms -> Select alarm 2 Door, by selecting the Blocking function and activating the
functionality of the door switch sensor. Several door sensors can be connected in parallel. The
circuit must always be terminated with a terminating resistor, see Figure no. 10.

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Figure number 9 - Extinguishing blocking setting
The resistance values in the diagram are as follows:
Rp: 1K8 Ohm, 0,1 W
Rs: 470 Ohm, 0,1 W
Resistors are part of the delivery, only 4 pcs of each type.
Figure number 10 - Wiring diagram of door sensor switch
●External Sounder LED Beacon
It is used for acoustic signaling in other, remote areas than the guarded area. The external
sounder LED Beacon is activated simultaneously with the extinguishing command. It can be
turned off with the "MUTE" button on the LES-RACK front panel.
External sounder LED Beacon power supply is Un, maximum current 150mA
The wiring diagram of the external siren is shown in Figure 12.

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The external sounder LED Beacon does not need to be activated by software, but it is
advisable to set an error message (see figure no. 11) if it is disconnected or if there is another
malfunction of the siren.
Figure number 11 - External Sounder LED Beacon setting
The resistance values in the wiring diagram are as follows:
Rp: 1K8 Ohm, 0,1 W
Rectifier diode
Figure number 12 - Wiring diagram of External Sounder LED Beacon
●Manual extinguishing release button
Allows to initiate extinguishing remotely and manually. The integrity of the circuit is
constantly monitored. The setting of the manual extinguishing release button is shown in
Figure no. 13.
The extinguishing action when the button is pushed must first be activated in software after
logging into the web interface (Alarms -> Select alarm: 1 Button). Multiple manual start

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buttons can be connected in parallel. The circuit must always be terminated with a
terminating resistor, see figure no.14.
Figure number 13 –Manual extinguishing release setting
The resistance values in the diagram are as follows:
Rp: 1K8 Ohm, 0,1 W
Rs: 470 Ohm, 0,1 W
Resistors are part of the delivery, only 4 pcs of each type.
Figure number 14 - Wiring diagram of Manual release button
●External dry contact sensors
These inputs allow remote control of the LES-RACK from other devices connected to it
(extinguishing start-up/extinguishing block/connection of fire alarm systems). If the

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connected equipment requires power supply, it should be supplied by an external source.
However, in no case are these inputs intended for connecting external fire detectors, unless
they have a relay output.
The integrity of external sensor circuits is also continuously monitored. If several external
sensors are connected in parallel, the circuit must also be terminated with a terminating
resistor
Wiring diagram of External dry contact sensors is shown in Figure no.15
The resistance values in the diagram are as follows:
Rp: 1K8 Ohm, 0,1 W
Rs: 470 Ohm, 0,1 W
Resistors are part of the delivery, only 4 pcs of each type.
Figure number 15 - Wiring diagram of External dry contact sensors

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Figure Number 16 - Setting the function of the external sensor
NOTE: These inputs can be used, for example, to connect door sensor switches when we
want to distinguish which door sensor is open at a given moment and monitor this status
with the name of the sensor, which will be visible in the log, see figure no. 16 (Text). LES-
RACK can therefore have up to 4 door sensor switches that can be distinguished from each
other. If there is no need to differentiate the door sensors, you can connect the door sensor
switches in parallel. However, it is necessary to observe the same connection principle as
shown above and activate the Blocking function. (Alarms -> Select alarm: 6 Sensor1-3).
●External temperature monitoring sensor
The installation is carried out in the protected space in which the temperature needs to be
monitored. The temperature sensor is used to check the temperature in the guarded area.
When the preset temperature limits are exceeded, the user-selected relay is switched on. The
length of the temperature monitoring cable (included in the product package) is 25 cm, at the
customer's request we can also deliver a cable with a length of up to 2 m or more.
After connection, the sensors must be activated via the web interface (Temperature ->
Thermometer -> Temperature2-3) Figure no. 17.
Figure number 17 - Activation of the external temperature sensor
Relation: relation between the measured temperature and the set temperature
Limit: temperature limit
Hysteresis: idle interval

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Figure number 18 - Setting the function of the external temperature sensor
●RS485
Used to connect standard serial communication. RS-485 (as well as RS-422) is characterized
by a two-wire connection of units. These wires are marked with the letters A and B. In the
idle state, the voltage on wire A is lower than on wire B. The maximum length of the bus is
up to 1,200 m, the maximum number of nodes (i.e. devices transmitting and receiving data
along the line) is 32. When using repeaters, the number of nodes can be higher. The
maximum transmission speed is inversely proportional to the length of the line. The
transmission speed for short connections (up to 10 m) can be up to 10 Mb/s. When
communicating over longer distances, the line must be terminated on both sides with
termination resistors, or terminators. The purpose of "terminators" is to prevent signal
reflections from the ends of the line, they also help to increase the resistance of the line
against interfering signals. Ideally, the terminator should have a value of 110 Ω (so-called
image impedance), the resulting impedance of the line is then 55 Ω (110 Ω || 110 Ω). For
connection, use one of the two RS485 contacts, the other can subsequently be used to connect
another control panel in series (so-called cascade). For more info . Settings in the Network
main menu.