Warning; Funtional Testing; Description - Geca CTR21/M Manuel D'utilisation

IST-2126.KM03.01
Mounting: The Fig. 2 shows the instrument size. It has to be wall-mounted by four screw anchors. The normally
closed manually resetting valve for the gas cut-off should be installed outside the room in a clearly indicated
position and should be protected from rain.
Cable glands: the lower side of the housing has 3 inputs designed for metric cable glands (M20x1.5 that accept
external cables Ø 6÷12 mm). These passages are closed, but they are not
installation requirements, they must be drilling. To facilitate the operation, they have a centering for the drill bit.
Electrical Connection:
the gas detection system. The device, clearly identified, must act only on Phase and Neutral. If it is necessary, you
may install a surge or lightning protector, etc.
The instrument is supply with non-reversible and plug-in terminals. Therefore the cables should be anchored to the
case in order to avoid terminal overstress. The connection to the detector does not need any hearting.
Fig. 3 shows the 230VAC powering connection with alarm siren and normally closed manual resetting valve.
Fig. 4 shows the 230VAC powering connection with alarm siren and normally open manual resetting valve.
Fig. 5 shows the 230VAC powering connection with alarm siren and our normally closed manual resetting valve
with positioning sensor (models VR420÷VR480,) to verify, if an alarm occurs, the really gas cut-off.
Fig. 5 shows the 12VDC powering connection with both 12VDC alarm siren and normally closed manual resetting
valve with, for example, our power supply unit PS175 (1,2A) or PS180 (2,5A) with internal 12VDC-7Ah battery to
maintain the system powered on in absence of Main power supply.
supply also to 230VAC.

WARNING

The detector doesn't need adjustments after being installed.
Average life: the sensitive element used in this detector has an excellent stability in time. In fresh air and in normal
working condition the sensor's life is more than 5 years from the date of installation.
Important: Catalytic sensors can operate only in presence of Oxygen. Do not use pure gases or a lighter directly on
the sensor since they could damage it irremediably. The detector is not able to detect gas leaks occurring outside
the room where it is installed, neither inside walls nor under the floor.
Attention: please note that in polluted environments, where vapours of flammable agents, especially solvents, might
be present, the sensor's life can be reduced. Some substances cause a permanent reduction in sensitivity. Avoid
contacts of the sensor with vapours of Silicone compounds (paintings and sealing paste), Tetra-ethyl Lead and Phos-
phate esters. Some other substances produce a temporary loss of sensitivity. These "inhibitors" include Hydrogen
sulphide, Chlorine, Chlorinated hydrocarbons and halogenated compounds. The sensitivity is recovered after a short
period of running in clear air.

FUNTIONAL TESTING

Periodical testing: we advise to carry out working tests every 6-12 months.
PAY ATTENTION: This procedure has to be made with extreme attention and by authorized and trained people;
because starting this procedure it will start both Outputs (relays) causing the activation of connected alarm devices.
The TEST key is deactivating when an alarm condition occurs.
Instrument operation check: push the TEST button for 3 seconds until all Led and relays deactivates.
Then the LED will illuminate in sequence. With the LEDs the corresponding relays will activate (Yellow LED and
nd
FAULT relay, 2 red LED and PREAL. Relay, 3
to normal working condition. NOTE: during the Test some conditions occur:
All 5 LEDs illuminates: ONLY when the detector is connected with a control wire for certain types of valves. In this
case the test results correct.
Yellow LED off (after red LEDs): indicates the lack of control wire of the valve or that the valve is closed. If this wire
is disconnected from the detector the test results correct, if not please check the valve and repeat test. If test result
is unchanged, electrical problems are in place, please contact the supplier.
The 3rd Red LED off: ONLY when the detector is connected with a control wire for certain types of valves. The
control wire is disconnected or the valve is open. Please check both the valve status and the wire connection and
repeat the test. If wire is disconnected, check if the wire on the terminal "AUX" is connected and repeat the test.
All other cases: If some LEDs do not light on or some relays do not switch, the detector is damaged. In this case
please replace it or send it back to the supplier.
Calibration testing with gas mixture: the calibration is carried out with specific gas in our laboratory. We advise
to check the calibration only using sample gas bottles with a mixture about 20% or 25%LEL Gas in Air (20.9%
Oxygen) (Gas Methane for CTR21/M and Butane for CTR21/G). Catalytic sensors cannot work without Oxygen.
The calibration testing should be done with Calibration Kit model TC011 (See specific user's manual). Connect the
sample gas bottle to the flow meter, open Gas (0.3 l/min flow rate), wait for 3 minutes and check that the instrument
activate Alarms as shown in chapter OPERATIONAL DESCRIPTION. Note: In case the values are not the required
ones please apply to our Laboratory.
FR

DESCRIPTION

Le CTR21 est un détecteur de gaz pour chaufferies, pour montage aux murs. Utilise un capteur de type catalytique
pour gaz inflammables. Elle est alimentée en 230Vca ou 12÷24Vcc/ca et l'indice de protection du détecteur est IP44.
Le CTR21 est fabriqué en deux versions que présentent les mêmes caractéristiques; la seule différence est consti-
tuée par l'étalonnage qui est effectué avec du gaz spécifique.
 La version CTR21/M qui doit être utilisée avec des installations alimentée en gaz méthane.
GECA S.r.l. Via E.Fermi, 98 GUSSAGO ( BS )
Istruzione / User's Manual / Manuel d'utilisation
The installation must be provided for the mains, a bipolar disconnect switch dedicated for
rd
red LED and ALARM relay). After 5 seconds the instrument returns
manually breakable, according to the
In this case, it is possible to connect the power
Tel: 030/3730218 Fax: 030/3730228
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