Tecnogas CRD/1 User manual
CRD CONTROL UNITS FOR GAS AND FIRE DETECTION REV.1 072022
TECNOGAS CRD control units are produced in 4 versions:
• CRD/1 with one zone in 3 DIN module box
• CRD/2 with two zones in 3 DIN modules box
• CRD/3 with three zones in 6 DIN modules box
• CRD/4 with four zones in 6 DIN modules box
TECHNICAL FEATURES CRD 1-2 CRD 3-4
Power supply (see specifications below) 230 Vac - 12 Vac - 12 Vdc
Sensor lines voltage 12 Vdc 12 Vdc
Number of lines 1-2 3-4
Smoke sensors per line Max 10 Max 10
Gas detectors per line Max 1 Max 1
Load limitations 0.6 A 1.1 A
Alarm relay C NO NC 10 A 1 1
Acoustic signal at 1 m 10 db a 12 V a 30 cm
Alarm LED (red) 2 4
Detector fault LED (yellow) 2 4
Power LED (green) 1 1
System failure LED (yellow) 1 1
End of line resistance* 3300 Ω 3300 Ω
*Included in the box
WARNING!
THE INSTALLATION OF THE GAS DETECTOR DOES NOT EXEMPT
FROM THE OBSERVATION OF ALL THE RULES REGARDING
THE CHARACTERISTICS, THE INSTALLATION AND USE OF THE
GAS APPLIANCES, THE VENTILATION OF THE ROOMS AND THE
DISCHARGE OF THE COMBUSTION PRODUCTS PRESCRIBED BY
THE REGULATIONS AND LAWS IN FORCE.
The CRD/1-2-3-4 control units are designed to
be housed in a DIN bar. They can manage remote
detectors for gas detection (methane [CH4] and
LPG) or for fire.
They are extremely reliable and easy to use and
install.
The CRD control units can be used with remote
gas detectors produced by TECNOGAS (RMP) or
with any 4÷20 mA sensor.
The CRD control units work with a power
supply voltage of:
• 230 Vac with internal stabilized power
supply, protected against short-circuits and
overloads;
• or 12 Vac (code 554411 - 554413 - 554416
and 554418) with external power supply;
• or 12 Vdc with external power supply
(exclusively for codes 554431- 554433 -
554436- 554438).
The CRD control units are managed by a
microcontroller. They have been designed to
snap action with a 4÷20 mA signal and allow the
connection of a remote gas detector or up to ten
smoke sensors per line.
They have an alarm relay, a buzzer and two LEDs
for visual signals:
• a green LED relating to the power supply
(POWER)
• a yellow system FAULT LED, in compliance with
the new European standards EN 50271.
The CRD control units have:
• visual reference signal for each connected
remote detector: red for ALARM and yellow for
FAULT
• an overcurrent protection circuit for the power
supplies of the remote detectors. This circuit
intervenes either on the pair of remote detectors
or on the single remote detector, according to the
type of control panel. For example: in the CRD/1
control unit the protection intervenes on the single
detector; in the CRD/2 control panel it intervenes
on the pair of remote detectors, etc.
Note for the installation of remote gas detectors
(detector for methane and LPG protected against
water splashes IP55): the gas detectors require
the connection of a 3.3 KΩ end-of-line resistor
between the + and S connections of the terminal
board supplied to the same; the latter will serve
to avoid a false sensor anomaly being reported.
See the diagram below and the remote gas
detector documentation. The same caution must
be observed if the remote detectors set up for the
chosen control panel model are not connected.
In this case, the end-of-line resistor will be
positioned between the + and S connections of
the terminal board of the control unit itself.
EXAMPLE:
4-zone control unit used with 3 zones (insert a
resistance also in the fourth zone).
Gas detection systems: if, following an alarm,
the gas concentration returns below the alarm
threshold, the CRD control units return to
normal working conditions (buzzer and relay
at rest) but the alarm signal that occurred
with relative ignition remains of the flashing
red LED.
On the front of the control units there are the reference visual signals for the control unit itself and for the connected detectors.
VISUAL SIGNALS
FUNCTIONAL DESCRIPTION
TECNOGAS srl - Viale L. Da Zara, 10 - 35020 Albignasego - Padova - Italy
CRD CONTROL UNITS FOR GAS AND FIRE DETECTION
SIGNALS REFERRED TO CRD 1 - 2 - 3 - 4 CENTRAL UNITS
SIGNALS REFERRED TO RMP REMOTE DETECTORS
ELECTRICAL CONNECTIONS
WARRANTY
GREEN LED (POWER) A: indicates the correct power supply of the device.
YELLOW LED (FAULT [FAULT] SYSTEM) B: indicates a malfunction of the CRD control unit or the microcontroller.
RED LED (ALARM) C: turns on when the alarm threshold is exceeded and stays on until the control unit is reset by pressing the TEST / RESET key.
YELLOW LED (FAULT [FAULT] SYSTEM) D: lights up in case of faulty sensor, interrupted line (open circuit); blinks 6 months before the sensor reaches its
expiration date and stays on steadily after expiration. The sensors have an end of life after 5 years from installation, an expiration that is anticipated
by the system in the event of premature deterioration of the sensor due to humid, greasy and dusty environments.
The CRD control units signal the achievement of an alarm threshold as soon as the sensor reaches the alarm state. Following the signal, the red ALARM
LED relating to the sensor in alarm will light up, the relay will activate, blocking the gas flow and a buzzer will emit an intermittent sound. The acoustic and
visual signals and the relay will remain active until the TEST / RESET button is pressed. If the alarm conditions remain after pressing the key, the control
unit goes back to the alarm state.
The TEST / RESET key has two functions:
• if it is simply pressed and released, it allows the alarms to be reset;
• if it is pressed for 5 seconds, the control unit checks its operation and for 1 second all the anomaly and alarm signalling LED and the buzzer light up.
In case of persistence of an alarm or a fault, the signals will return to highlight the alarm or fault even after the memory has been cleared.
NOTE FOR INSTALLERS:
After 5 years of installation (a date that can be anticipated due to premature deterioration of the sensor in humid, greasy and dusty environments), the
sensors reach the end of their life. Approaching the deadline is signalled 6 months earlier with the flashing of the FAULT LED (yellow). On expiry the LED
remains always on. To clear the sensor expiration memory, perform the following operations:
• all sensors connected to the control unit and any “plug” resistors are disconnected;
• press the TEST / RESET button for 5 seconds;
• the FAULT LEDs will flash quickly for a few seconds to indicate that the sensor expiration memory has been cleared and then they will remain on because
the sensors are disconnected;
• connecting the new sensors and any “plug” resistors, the “FAULT” LEDs will switch off.
TERMINAL BOARDS
230Vac: 230Vac power supply input
12Vac: 12Vac power supply input
12Vdc: 12Vdc power supply input
C NO NC / ALARM: free exchange alarm relay output (max 10 A)
S1 ... S4 / DETECTORS: S inputs for detections from the detectors
+ - / DETECTORS: 12 Vdc detector power supply
(these outputs should only be used to connect the detectors).
To connect the detectors, refer to the table for the section of the cables to be used:
Note for the installation of smoke detectors:
smoke detectors require the connection of a 3.3 KΩ
end-of-line resistor; the latter will serve to avoid a
false sensor anomaly being reported. The diagram
shown above is a principle diagram, for more details
please refer to the document on the packaging of the
smoke detectors you will install.
The equipment is guaranteed for a period of 12 months from the date of purchase.
CONDITIONS: free replacement of components recognized as defective by the factory. The equipment must be sent to the retailer or alternatively directly
to TECNOGAS srl Viale L. da Zara 10 - 35020 Albignasego (PD), carriage paid. The warranty excludes failures due to tampering by unauthorized personnel,
carelessness in use or resulting from incorrect or improper installations and caused by phenomena unrelated to the normal operation of the appliance. We
are not liable for any damage, direct or indirect, caused to people or things by damage to the product or consequent to the forced suspension of use of the
same. For any dispute, the competent court is that of Padua.
line conductor section table
Cable section mm2
M line Smoke detectors Gas detectors
50 0.50 0.75
100 0.75 1
200 1 1.50
300 1.50 2.50
TECNOGAS srl - Viale L. Da Zara, 10 - 35020 Albignasego - Padova - Italy
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