urmet domus Elkron C420 User manual

1/28 Installazione MP508
DS80SC86-005D LBT80743
Installation Manual
C420
4 – 20 zones
Conventional control panel
GB
0051
12

2 C420 Installation Manual
The information contained in this document has been collected and controlled carefully. However, the company cannot be held
responsible for any possible errors and omissions.
The company reserves the right to make, at any time and without warning, improvements and modifications to the products
described in this manual.
In this manual, you may find references and information about products (hardware or software) or services not commercialized yet.
These references and information do not imply that the company intends to commercialize these products and services.
Elkron is a trademark of URMET S.p.A.
All trademarks mentioned in this document belong to the corresponding owners.
All rights reserved. The total or partial reproduction of this document is authorised only for installation purposes of the C420
System.
Tel. [phone] – Fax [phone]
www.elkron.com – mail to: [email protected]

C420 Installation Manual 3
TABLE OF CONTENTS
1 GENERAL DESCRIPTION........................................................................................................................................................... 4
1.1 MAIN CHARACTERISTICS................................................................................................................................................... 4
1.2 OPTIONS.............................................................................................................................................................................. 4
1.3 CE LABELS AND RELATED DOCUMENTATION ................................................................................................................ 5
2 GENERAL SAFETY RULES........................................................................................................................................................ 6
2.1 SAFETY OF PEOPLE........................................................................................................................................................... 6
2.1.1 Installation, start up and maintenance operations........................................................................................................ 6
2.1.2 Power supply insulating device.................................................................................................................................... 6
2.1.3 Batteries....................................................................................................................................................................... 6
2.1.4 Disposal of batteries .................................................................................................................................................... 6
2.2 PRODUCT SAFETY.............................................................................................................................................................. 7
2.3 SPECIFIC PRECAUTIONS................................................................................................................................................... 7
3 INSTALLATION AND CONNECTIONS....................................................................................................................................... 8
3.1 ELEMENTS INCLUDED........................................................................................................................................................ 8
3.2 INSTALLATION OF THE CONTROL PANEL........................................................................................................................ 8
3.3 INTERNAL LAYOUT OF THE C420 MODULES................................................................................................................... 9
3.3.1 AC/DC power supply unit........................................................................................................................................... 10
3.3.2 CPU board................................................................................................................................................................. 11
3.3.3 Command and control module................................................................................................................................... 12
3.4 BATTERIES INSTALLATION.............................................................................................................................................. 14
3.5 ML420 OPTIONAL MODULE.............................................................................................................................................. 15
3.5.1 ML420 installation...................................................................................................................................................... 16
3.6 MR420 OPTIONAL MODULE ............................................................................................................................................. 17
3.6.1 MR420 installation ..................................................................................................................................................... 18
3.7 RS232/485 OPTIONAL BOARD.......................................................................................................................................... 18
3.7.1 RS232/485 board installation..................................................................................................................................... 18
3.8 SYSTEM START UP........................................................................................................................................................... 19
3.8.1 Functional tests.......................................................................................................................................................... 19
4 COMMANDS AND INDICATORS.............................................................................................................................................. 20
4.1 KEYBOARD ........................................................................................................................................................................ 20
4.2 LED INDICATORS .............................................................................................................................................................. 21
5 INPUTS AND OUTPUTS............................................................................................................................................................ 22
5.1 AUXILIARY POWER SUPPLY UNITS INPUTS.................................................................................................................. 22
5.2 SIREN OUTPUT.................................................................................................................................................................. 22
5.3 SIGNALLING RELAYS........................................................................................................................................................ 22
5.3.1 Fault relay.................................................................................................................................................................. 22
5.3.2 Programmable relay................................................................................................................................................... 22
5.3.3 Siren relay.................................................................................................................................................................. 22
5.3.4 Alarm relay................................................................................................................................................................. 22
6 TECHNICAL CHARACTERISTICS............................................................................................................................................ 23
6.1 DETECTORS ...................................................................................................................................................................... 23
6.2 DETECTION CIRCUIT........................................................................................................................................................ 23
6.3 POWER SUPPLY UNIT ...................................................................................................................................................... 23
6.4 BATTERIES ........................................................................................................................................................................ 23
6.5 SUPERVISED SIREN OUTPUT.......................................................................................................................................... 24
6.6 SUPERVISED SIREN OUTPUTS – MR420........................................................................................................................ 24
6.7 FIELD OUTPUT................................................................................................................................................................... 24
6.8 RELAY OUTPUTS............................................................................................................................................................... 24
6.9 DISTRIBUTION OF CONSUMPTIONS............................................................................................................................... 24
6.10 MECHANICAL – ENVIRONMENTAL CONDITIONS...................................................................................................... 25
7 ELECTRICAL CONNECTIONS ................................................................................................................................................. 26

4 C420 Installation Manual
1 GENERAL DESCRIPTION
1.1 MAIN CHARACTERISTICS
C420 is a modular conventional control panel which can handle from 4 (basic configuration) up to max 20 detection circuits (via
optional circuit modules ML420) where it is possible to connect up to 512 points.
Each circuit covers a zone which can house up to 32 conventional points (the control panel, though, has to be compliant with the
constraint of max 512 total points in the field).
Each zone is permanently associated to a dedicated relay which is activated when the zone goes to alarm condition.
Moreover, the control panel is equipped with the following outputs and relays:
•one cumulative alarm relay output
•one cumulative siren relay output
•one cumulative fault relay output
•one programmable relay output activated as a consequence of lack of AC mains or presence of at least one exclusion
•one supervised siren output
•four supplementary supervised siren outputs, available on the optional module MR420, which can be associated
independently of each other to one or more zones.
The control panel is equipped with an alphanumeric 4X40 display and a 12 keys keyboard. Moreover, an external PS2 keyboard
can be connected to the control panel in order to ease the input during the programming phase.
By using the optional interface board RS232/485, the control panel can be connected to a remote LCD annunciator which shows
the contents of the display during the monitoring phase and a printer with Centronics interface for event log printing.
The control panel is equipped with an event log able to store up to 1000 events.
Also, there is a clock with battery backup for keeping date and time updated even when the control panel is powered off.
The control panel can house internally two 12V-12Ah (RB1212 type) batteries (sold separately).
1.2 OPTIONS
Optional modules
•ML420 module which handles 4 conventional detection circuits and 4 relay outputs
•MR420 module which handles 4 supervised siren outputs
•RS232/485 interface board

C420 Installation Manual 5
1.3 CE LABELS AND RELATED DOCUMENTATION
In compliance with the requirements of the product standards EN54-2 and EN54-4, the “CE” label containing all the required
information is reported below:
is a trademark of URMET S.p.A.
Via Bologna, 188/C - 10154 Torino - Italy
12
0051-CPR-0382
DoP n. 0051-CPR-0382
C420
Fire detection and fire alarm
Control panel
EN 54-2: 1997 + A1:2006
EN 54-4: 1997 + A1:2002 + A2:2006
100-240 V∼-15/+10%, 50/60 Hz, 3 A
V out: 26 V⎓, ± 10%, 4.85 A
Options with requirements list:
7.8 Output to fire alarm device
7.11 Delay to outputs
7.12 Co-incidence detection
10 Test condition
0051
12
0051

6 C420 Installation Manual
2 GENERAL SAFETY RULES
2.1 SAFETY OF PEOPLE
A few general safety instructions to be observed are reported below.
2.1.1 Installation, start up and maintenance operations
Only skilled personnel is allowed to carry out the installation phase, the search of faults and, in general, any intervention on the
control panel or the system.
These personnel must be able to access to the relevant documentation, and this manual in particular. Unqualified personnel is not
authorized to operate on the control panel. Moreover, the control panel must be powered off before any intervention can take place.
2.1.2 Power supply insulating device
The installation standard requires the use of a manually operated power supply insulating device in the connection of the control
panel to the AC mains. This device must be easily identifiable since it will be placed in an electrical cabinet, along with other
equipment.
2.1.3 Batteries
The control panel is equipped with an internal power supply composed of two sealed lead batteries.
WARNING!
If the batteries are replaced with ones of different type there is danger of explosion. Dispose of the exhausted batteries by following
the relevant instructions.
The batteries can be a risk of electric shock or burn due to the very high short circuit current. Please, follow these precautions:
•remove clocks, rings, bracelets and any other metallic object;
•only use objects with insulated handles.;
•do not put metallic tools on the batteries;
RISK OF ELECTRIC SHOCK!
•do not try to modify the cables or the terminals of the batteries; these operations can lead to injuries.
2.1.4 Disposal of batteries
The lead batteries contain harmful substances!
At the end of their lifecycle they must not be disposed of like ordinary waste, but they must be delivered to an authorized waste
recycling and disposal centre.

C420 Installation Manual 7
2.2 PRODUCT SAFETY
The control panel must undergo a permanent installation. Please, look at the relevant section in this manual.
•Do not place the control panel next to liquids or in an excessively humid environment;
•do not let liquids or foreign matter go inside the equipment;
•do not cover the ventilating grilles;
•do not expose the control panel to direct sunrays or close to heat sources.
All the components have been selected for the intended use and their characteristics are guaranteed when the environmental
conditions outside their package complies with the ones specified for the class 3K5 of EN 60721-3-3:1995.
2.3 SPECIFIC PRECAUTIONS
Strictly comply with the sequence of installation and connection instructions described in this manual.
Check the indications reported in the identification plate: they must correspond to the characteristics of the power supply AC mains
where the control panel will be connected.

8 C420 Installation Manual
3 INSTALLATION AND CONNECTIONS
3.1 ELEMENTS INCLUDED
The following elements are provided with the control panel in the same package:
•4 resistors (3300Ωvalue) for detection circuit termination (end of line resistors)
•1 resistor (3300Ωvalue) for siren output circuit termination (end of line resistor)
•4 plastic clips to fix plastic bands to the metal box
•2 female plug type terminals
•black cable for connection of batteries
•red cable (equipped with fuse-holder) for connection of batteries
•grey cable for connection of batteries
•5x20 250V F4A fuse
•User manual
•Programming manual
•Installation manual
•1 black jumper pitch 2.54mm
•1 soldered copper jumper
3.2 INSTALLATION OF THE CONTROL PANEL
•Remove the screw located on the front cover and open the control panel.
•Open the holes located on the top/bottom area of the metallic box if they are convenient for cabling; alternatively, use the
holes already available at the back of the box.
•Fix the control panel to the wall by using the suitable holes placed at the back of the box.
•The control panel is fastened to the wall by means of 4 screw anchors with maximum dimension of 6 mm
•Insert the plastic clips in the holes available at the back of the metal box.
•Let the AC mains cable and the ground connection pass through the hole located under the power supply unit and on the
bottom part of the metallic box.
•Connect the line, neutral and ground cables to the power supply unit.
•For the supply cable, a manually operated power supply switching device externally to the control panel must be used; this
switching device must have a 3 mm minimum distance between contacts.
The switching equipment must disconnect simultaneously the Line and the Neutral conductor.
•Complete the cabling phase by making sure that the other cables are not installed too close to the power supply cable.
When cabling is over, ensure that all the cables and the sheaths of the detection circuits are fixed and do not cause any short
circuit, then power supply the control panel. The connection of the sheaths at ground must be performed by connecting the
available female plug type terminals to the male terminals located on the metallic backplane where the command and control
module is placed.
Use shielded cables with minimum section of 0.50mm
2
for the detection circuits.
The resistance of the circuit must not exceed 25Ωper wire (50Ωtotal).
The following table reports the maximum length of the detection circuit as a function of the section of the cable.
Se
ction
(mm
2
)
Max distance
(m
eters
)
0.5 600
0.75 900
1.0 1200
1.5 1800
A 3300Ωend-of-line resistor must be connected to the output terminals of the last point on the line.
The unused circuits must be closed anyway by using a 3300Ωresistor connected directly to the terminals of each circuit.
Note: Wires with cross-section area of 0.5 mm² or larger must comply with IEC 60332-1-2; wires with cross-section area smaller
than 0.5 mm² must comply with IEC 60332-2-2.

C420 Installation Manual 9
3.3 INTERNAL LAYOUT OF THE C420 MODULES
The control panel is composed of several modules and boards properly connected among them:
•Power supply unit (AC/DC)
•CPU board
•Command and Control module (MCC)
•Display module
•Up to 4 optional ML420 circuit modules – 4 conventional detection circuits and 4 relay outputs per module
•Optional MR420 module – 4 supervised siren outputs
•Optional interface board RS232/485
Figure 1 – Internal layout of modules
DISPLAY

10 C420 Installation Manual
3.3.1 AC/DC power supply unit
The power supply unit, located on the left side of the mechanical chassis, converts the AC mains in a DC voltage suitable to power
the control panel on. The terminals for the connection with the AC mains are located on the module as indicated below.
Figure 2 – Terminal board of the power supply unit
Power supply unit terminals
L Mains cable connection (phase)
N Mains cable connection (neutral)
Ground connection
COM Negative output 26.4V
COM Negative output 26.4V
+V Positive output 26.4V
+V Positive output 26.4V
NOTE: do not remove the connections already in place.

C420 Installation Manual 11
3.3.2 CPU board
The CPU board, located on the foreground inside the box, manages the control panel by communicating with the modules it is
composed of. Several connectors are placed on this board. A few of them are permanently used; other ones are available for
connecting optional modules. Below are reported the lists of connectors and jumpers available on the CPU board.
Figure 3 – CPU board
CPU
board
connectors
KEYBOARD Connector used to connect the internal keyboard, located on the front panel (1)
DISPLAY Connector used to connect the LCD display, located on the front panel (1)
MAIN
MODULE Connector used to connect the CPU board to the Command and Control module, located on the back of the metallic chassis (1)
EXT USB Connector used to connect the optional module IT USB KEY for interfacing with an USB mass
storage
COM1
MODULE Connector used to connect the optional board RS232/485 for interfacing with the printer module and the LCD annunciator
PS2 Connector used to connect a standard PS2 keyboard
(1) Connection already in place.
CPU
board
JP3 jumpers
1-2 Not used
3-4 Not used
5-6 When the jumper is inserted, the auxiliary external power supply units are supervised by the control panel.
The jumper must be inserted/removed with the control panel powered off.
7-8 Reserved – do not insert
DISPLAY
EXT
USB
MAIN
MODULE
KEYBOARD
COM1
MODULE
PS2
JP3
8
6
4
2
7
5
3
1
BATT.
BUZZER

12 C420 Installation Manual
3.3.3 Command and control module
The Command and Control module (MCC), located on the back of the chassis, handles several sections and notifies to the CPU
board any malfunctioning and alarm conditions. This module is composed of the following sections:
•Power supply
•Battery charger
•4 conventional detection circuits
•Supervised siren output
•External power supply units control inputs
•Signalling output (relay) for alarm and fault
Below is reported the description of each element located on the Command and Control module.
Figure 4 – Command and Control module
MCC module connectors
CPU MODULE This connector is used to connect the CPU board (1)
MR420
MODULE This connector is used to connect the optional module MR420
EXPANSION
MODULE This connector is used to connect the optional module ML420 – it is possible to connect up to 4 modules in series.
POWER IN This connector is used to connect the power supply unit (1)
(1) Connection already in place.
JP9
1 2
JP1
JP6
3 2 1 3 2 1 3 2 1 3 2 1
JP7 JP8 JP9
JP12 JP13
3 2 13 2 1
POWER IN
CPU
MODULE
MR420
MODULE
EXPANSION
MODULE
RS485
A+ B-
EXT PS1
+ -
EXT PS2
+ -
BATTERY
- +
OUT
+ -
IND CKT
+ -
S.ALARM
PC CC
ALARM
PC CC
PROG
C NC NO
AULT
C NC NO
CTRL PS
+ -
LINE 1
+ -
LINE 2
+ -
LINE 3
+ -
LINE 4
+ -
RELAY1
CC PC
RELAY2
CC PC
RELAY3
CC PC
RELAY4
CC PC
H3
H1
H2

C420 Installation Manual 13
MCC module terminals
RS485 A+ RS485 A+ output for connection to the printer module and the LCD annunciator
RS485 B- RS485 B- output for connection to the printer module and the LCD annunciator
EXT PS1 + 24V
⎓
auxiliary external power supply unit 1 positive input – the supervision of this input
depends on the JP3 jumper (pin 5,6) of the CPU board
EXT PS1 - Auxiliary external power supply unit 1 negative input
EXT PS2 + 24V
⎓
auxiliary external power supply unit 2 positive input – the supervision of this input
depends on the JP3 jumper (pin 5,6) of the CPU board
EXT PS2 - Auxiliary external power supply unit 2 negative input
BATTERY - Batteries negative input
BATTERY + Batteries 24V
⎓
positive input
OUT + 24V
⎓
1A positive field output
OUT - Negative field output
IND CKT + 24V
⎓
500mA positive siren output
IND CKT - Negative siren output
S. ALARM PC Siren relay dry contact output – NO or NC selected via JP12
S. ALARM CC Siren relay dry contact output
ALARM PC Alarm relay dry contact output – NO or NC selected via JP13
ALARM CC Alarm relay dry contact output
PROG C Programmable relay output – Common dry contact
PROG NC Programmable relay output – Normally Closed dry contact
PROG NO Programmable relay output – Normally Open dry contact
FAULT C Fault relay output – Common dry contact
FAULT NC Fault relay output – Normally Closed dry contact
FAULT NO Fault relay output – Normally Open dry contact
CTRL PS + Output for controlling external power units provided with NC fault contact (see paragraph 5.1)
CTRL PS - Input for controlling external power units provided with NC fault contact (see paragraph 5.1)
RELAY 1 CC Zone 1 alarm relay dry contact output – NO or NC selected via JP6
RELAY 1 PC Zone 1 alarm relay dry contact output
RELAY 2 CC Zone 2 alarm relay dry contact output – NO or NC selected via JP7
RELAY 2 PC Zone 2 alarm relay dry contact output
RELAY 3 CC Zone 3 alarm relay dry contact output – NO or NC selected via JP8
RELAY 3 PC Zone 3 alarm relay dry contact output
RELAY 4 CC Zone 4 alarm relay dry contact output – NO or NC selected via JP9
RELAY 4 PC Zone 4 alarm relay dry contact output
LINE 1 + Detection circuit 1 positive terminal
LINE 1 - Detection circuit 1 negative terminal
LINE 2 + Detection circuit 2 positive terminal
LINE 2 - Detection circuit 2 negative terminal
LINE 3 + Detection circuit 3 positive terminal
LINE 3 - Detection circuit 3 negative terminal
LINE 4 + Detection circuit 4 positive terminal
LINE 4 - Detection circuit 4 negative terminal
The non supervised outputs of the module (relay outputs) cannot drive:
•type “C” fire detection equipment;
•type “E” and type “J” alarm and fault signalling transmission equipment;
•type “G” control equipment for automatic fire protection.
The type of equipment is the one referred to in the EN54-1 standard.

14 C420 Installation Manual
MCC module jumpers
JP1 Not inserted Normal working mode (*)
Inserted If the control panel is powered OFF and the batteries are connected, when this
jumper is inserted the control panel is powered ON directly by the batteries
JP6 1-2 Zone 1 alarm relay – Normally Closed dry contact
2-3 Zone 1 alarm relay – Normally Open dry contact (1)
JP7 1-2 Zone 2 alarm relay – Normally Closed dry contact
2-3 Zone 2 alarm relay – Normally Open dry contact (1)
JP8 1-2 Zone 3 alarm relay – Normally Closed dry contact
2-3 Zone 3 alarm relay – Normally Open dry contact (1)
JP9 1-2 Zone 4 alarm relay – Normally Closed dry contact
2-3 Zone 4 alarm relay – Normally Open dry contact (1)
JP12 1-2 Siren relay – Normally Closed dry contact
2-3 Siren relay – Normally Open dry contact (1)
JP13 1-2 Alarm relay – Normally Closed dry contact
2-3 Alarm relay – Normally Open dry contact (1)
(1) Default setting.
MCC module fuses
F1 Field output protection fuse – 5x20 250V F1A
F2 Siren output protection fuse – 5x20 250V F500mA
3.4 BATTERIES INSTALLATION
The two batteries must be placed inside the control panel and connected in series between them, as shown in the picture below.
Use only the cables found in the package of the control panel to connect the batteries; insert the 5x20 250V F4A fuse in the fuse
holder located on the red cable used to connect the positive terminal. If the fuse breaks, replace it with a new one having the same
characteristics.
Batteries replacement must be performed only by qualified personnel.
Figure 5 – Housing and connection of the batteries

C420 Installation Manual 15
3.5 ML420 OPTIONAL MODULE
The ML420 optional module allows the control panel to increase the number of detection circuits. Each module adds 4 conventional
detection circuits and 4 zone relay outputs. The control panel can be equipped with up to 4 ML420 modules connected in series.
The terminals and connectors of this module are described below.
Figure 6 – ML420 module
ML420
connectors
JP1 This connector is used to connect the module to the MCC module or to the previous ML420
JP3 This connector is used to connect the module to the next ML420
ML420
terminals
RELAY 1 CC Zone 5/9/13/17 alarm relay dry contact output (1)
NO or NC selected via JP6
RELAY 1 PC Zone 5/9/13/17 alarm relay dry contact output (1)
RELAY 2 CC Zone 6/10/14/18 alarm relay dry contact output (1)
NO or NC selected via JP7
RELAY 2 PC Zone 6/10/14/18 alarm relay dry contact output (1)
RELAY 3 CC Zone 7/11/15/19 alarm relay dry contact output (1)
NO or NC selected via JP8
RELAY 3 PC Zone 7/11/15/19 alarm relay dry contact output (1)
RELAY 4 CC Zone 8/12/16/20 alarm relay dry contact output (1)
NO or NC selected via JP9
RELAY 4 PC Zone 8/12/16/20 alarm relay dry contact output (1)
LINE 1 + Positive output for detection circuit 5/9/13/17 (1)
LINE 1 - Negative output for detection circuit 5/9/13/17 (1)
LINE 2 + Positive output for detection circuit 6/10/14/18 (1)
LINE 2 - Negative output for detection circuit 6/10/14/18 (1)
LINE 3 + Positive output for detection circuit 7/11/15/19 (1)
LINE 3 - Negative output for detection circuit 7/11/15/19 (1)
LINE 4 + Positive output for detection circuit 8/12/16/20 (1)
LINE 4 - Negative output for detection circuit 8/12/16/20 (1)
(1) The circuit number and relay number depend on the number of installed modules.
ML420
jumpers
JP6 1-2 Zone 5/9/13/17 alarm relay (1) – normally closed dry contact
2-3 Zone 5/9/13/17 alarm relay (1) – normally open dry contact (2)
JP7 1-2 Zone 6/10/14/18 alarm relay (1) – normally closed dry contact
2-3 Zone 6/10/14/18 alarm relay (1) – normally open dry contact (2)
JP8 1-2 Zone 7/11/15/19 alarm relay (1) – normally closed dry contact
2-3 Zone 7/11/15/19 alarm relay (1) – normally open dry contact (2)
JP9 1-2 Zone 8/12/16/20 alarm relay (1) – normally closed dry contact
2-3 Zone 8/12/16/20 alarm relay (1) – normally open dry contact (2)
(1) Circuit number and relay number depend on the number of installed modules.
(2) Default setting.
3
2
1
3
2
1
3
2
1
3
2
1
RELAY1
CC PC
RELAY2
CC PC
RELAY3
CC PC
RELAY4
CC PC
LINE 1
+ -
LINE 2
+ -
LINE 3
+ -
LINE 4
+ -
H1
H2
H3
JP1 JP3

16 C420 Installation Manual
3.5.1 ML420 installation
The following components can be found in the package of ML420:
•4 3300Ωend of line resistors for detection circuit termination
•2 female plug terminals
•1 plastic spacer
•2 fixing screws
•1 toothed washer
•3 plastic clips to fix plastic bands to the metal box
In order to install the ML420 optional module, please proceed as indicated below:
•Turn the control panel OFF by operating on the power supply insulating device, then open the lid of the control panel and
disconnect the batteries.
•Insert, by pressing gently, the plastic spacer in the hole located in the metallic case on the back of the control panel,
correspondent to the H2 hole located in the module.
•Insert the JP1 connector of the ML420 module in the “EXPANSION MODULE” connector located in the MCC module or in
the JP3 connector of the previous already connected ML420 module.
•Gently press the ML420 module in order to stick the plastic spacer in the H2 hole; at the same time, align the H1 and H3
holes located in the module with the threaded bushings located in the metallic case.
•Insert and fasten one fixing screw in the H1 position of the module.
•Insert the toothed washer in the other fixing screw and fasten it in the H3 position of the module.
•Connect further modules if necessary.
•Insert the plastic clips in the holes located on the back of the case, in correspondence of the module.
•Perform the electrical connections on the modules. If a detection circuit is not used, insert the end of line resistor in the
circuit terminals. Use the female plug terminals to connect the sheaths of the shield of the detection circuits to the metallic
case which supports the MCC module.
•Reconnect the positive cable of the batteries, close the cover lid and power the control panel on.
•Perform the “Cards Initialization” procedure as described in the programming manual.
The outputs of the optional module ML420 cannot drive:
•type “C” fire detection equipment;
•type “E” and type “J” alarm and fault signalling transmission equipment;
•type “G” control equipment for automatic fire protection.
The type of equipment is the one referred to in the EN54-1 standard.

C420 Installation Manual 17
3.6 MR420 OPTIONAL MODULE
The optional module MR420 allows the control panel to expand its outputs by adding 4 supervised siren outputs. The module must
be connected to the Command and Control module. The connectors and terminals of the module are reported below:
Figure 7 – MR420 module
MR420 connectors
JP1 This connector is used to connect the module to the MCC
M
R
420
terminals
S1+ Supervised siren output #1, positive 24V
⎓
250mA terminal
S1- Supervised siren output #1, negative terminal
S2+ Supervised siren output #2, positive 24V
⎓
250mA terminal
S2- Supervised siren output #2, negative terminal
S3+ Supervised siren output #3, positive 24V
⎓
250mA terminal
S3- Supervised siren output #3, negative terminal
S4+ Supervised siren output #4, positive 24V
⎓
250mA terminal
S4- Supervised siren output #4, negative terminal

18 C420 Installation Manual
3.6.1 MR420 installation
The following components are provided along with the MR420 module, in the same package:
•4 3300Ωend of line resistors for siren output termination
•2 plastic spacers
•1 metallic hexagonal spacer
•1 toothed washer
In order to install the MR420 optional module, please proceed as indicated below:
•Turn the control panel OFF by operating on the power supply insulating device, then open the lid of the control panel and
disconnect the batteries.
•Unscrew and remove the fixing screw of the MCC module placed in the H3 hole (see the figure of MCC).
•Place the toothed washer on the H3 hole of the MCC module and screw the metallic hexagonal spacer in it
•Gently insert the plastic spacers in the H1 and H2 holes of the MCC module
•Place the MR420 module above the plastic spacers and the metallic hexagonal spacer in correspondence of the holes of
the module. Make sure that all the contacts of the JP1 connector are placed in the plastic connector below.
•Press gently the MR420 module in order to stick the plastic spacers in the H1 and H2 holes.
•Place the toothed washer on the H3 hole of the MR420 module and fasten in the MCC the screw previously removed.
•Perform the electrical connections on the module. If an output is not used, insert the end of line resistor in the output
terminals.
•Reconnect the positive cable of the batteries, close the cover lid and power supply the control panel
•Perform the “Cards Initialization” procedure as described in the programming manual.
3.7 RS232/485 OPTIONAL BOARD
The RS232/485 optional board provides the control panel with an RS485 serial communication channel which can be used to
connect the control panel to a printer and an LCD annunciator. The RS232/485 optional board is not covered by the EN54-2
standard.
3.7.1 RS232/485 board installation
In order to install the RS232/485 optional board in the control panel, please proceed as indicated below:
•Turn the control panel OFF by operating on the power supply insulating device, then open the lid of the control panel and
disconnect the batteries.
•Insert the RS232/485 board in the COM1 MODULE connector available in the CPU board and fix it to the front panel by
using the available screws.
•Perform the electrical connections on the RS485 channel available at the terminals of the MCC module.
•Reconnect the positive cable of the batteries, close the cover lid and power the control panel on.
•Enable the printer module and/or the LCD annunciator as described in the programming manual.

C420 Installation Manual 19
3.8 SYSTEM START UP
After having carried out the electrical connections, the control panel can be powered on and activated as follows:
•Connect the batteries terminals.
•Close the plastic cover of the control panel.
•Power supply the control panel via the AC mains.
•Wait a few minutes in order to let the conventional detectors perform the automatic calibration.
•Perform the functional tests on the system and the points.
3.8.1 Functional tests
Circuits verification
• Remove a point from the circuit and verify that the control panel signals the opening of the circuit by displaying a message,
turning the fault LED indicator ON and activating the buzzer.
If a malfunctioning is notified to the user, verify that:
•There is no short circuit.
•The polarity of the circuit and the points is correct.
•The points are not consuming too much.
•The end of line resistors are connected.

20 C420 Installation Manual
4 COMMANDS AND INDICATORS
4.1 KEYBOARD
The control panel is equipped with a 12 keys keyboard located on the front panel. For further information, please refer to the
programming manual.
Icon
N
a
me
Fun
ction
INCREASE
DELAY
This key only affects running siren output activation delays;
when this key is pressed, each delay is incremented by 1
minute.
SKIP
DELAY
This key only affects running siren output activation delays;
when this key is pressed, the delays are skipped and the siren
output is activated immediately.
SILENCE/REARM
SIRENS
This key silences the siren outputs activated by a previous
alarm condition and rearms the siren outputs previously
silenced through the same key.
MASTER
ALARM This key activates the master alarm condition.
TEST
LAMP This key turns all the LEDs ON and activates the buzzer for 3
seconds.
GLOBAL
RESET This key restores the control panel to the idle state, by deleting all the active fault and alarm conditions.
UP
DOWN
LEFT
RIGHT
Directional arrows, used for menu navigation.
ESC/MENU This key allows the user to enter the main menu of the control
panel.
ACK This key allows the user to acknowledge the events occurred
in the control panel by silencing the sounding buzzer.
A PS2 standard keyboard can be connected to the control panel.
For further information, please refer to the programming manual.