CTP24 (29.05.2019) Manual de ususario / User’s Manual / Manuel d’utilisation Pag.5/10
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tive logic. It is normally used to stop the gas through the manual reset solenoid valve and/or the interruption of the
electrical power at the plant only, the control unit must remain powered.
The display shows the channel, in alarm, alternately displaying the value and writing AL2.
If the manual button is connected to the AUX1 input, when pressed, the ALARM 2 relay will be activated.
If it has been installed a manual reset solenoid valve N.C. with magnetic sensor (mod. VR420÷VR480) connected to AUX2 input, in case
the valve has not closed the gas, the yellow LED and the FAULT Relay will activate (see FAULTS section).
“RESET” Key: this key has two functions:
SILENCING: when the key is pressed, the Red LED flashes and the ALARM 1 relay connected to the Siren is si-
lenced, but after 120 seconds, it will automatically reactivate.
RESET: if the 2
nd
alarm threshold is exceeded, the ALARM 2 relay remains activated (latched), even if the gas con-
centration decreases (because the valve is closed, if installed). The display shows the channel, in alarm, alternate-
ly displaying the value and writing AL2. After having eliminated the cause of the alarm, to restore the normal work-
ing conditions press the RESET key. For safety, the key cannot operate when the remote detector is detecting gas.
Faults: The control unit indicates a fault condition of a remote gas detector. The display shows FLT (FAULT) on the
faulty channel, turns on the yellow LED, and activates the FAULT relay that is normally energized with voltage-free
changeover contacts, if necessary; it can be used both to signal remotely an occurred damage and to signal the ab-
sence of power to the instrument. Fault signals must not be connected to the alarm signals.
Manual reset solenoid valve NC with magnetic sensor failure: this situation appears ONLY when is installed an electro
valve with magnetic sensor; connected to AUX2 imput. If the valve does not close the gas, (with the ALARM 2 relay in alarm), the magnetic
sensor signals to the control unit the malfunction. If the problem will be resolved, (the solenoid valve is closed) the fault condition (yellow LED
on and FAULT relay activated) will be canceled by pressing the RESET key. If, however, by pressing the RESET key, the alarm ends, (Gas
concentration below 10% LIE) the fault condition will be canceled anyway.It is therefore advisable to check that the solenoid valve is not
blocked and that the connecting cables with the solenoid valve are not interrupted.
INSTALLATION
The control unit and detectors should be installed according to the national disposition in force on the matter.
Positioning: The control unit must be installed in an accessible location, easily visible and away from heat sources.
The control unit cannot be installed outdoors.
Please note that for safety, the control unit is to be installed in safe areas where there are present or can form
flammable atmospheres and concentrations exceeding 24 % volume oxygen.
The remote detectors: it has to be installed as described in the specific instructions attached with it. After the in-
stallation and referred to the gas indicated on the testing label of the remote gas detector, apply on the CTP24, the
self-sticking label with the name of the detected gas inserted in the package.
Valve: The manually resetting solenoid valve for the gas cut-off should be installed outside the room in a clearly in-
dicated position and should be protected from direct sunlight and rain.
Mounting: The Fig.2 shows the instrument size. It has to be wall-mounted by four screw anchors. The housing
opens and closes with the 4 screws on the cover.
IMPORTANT: TO AVOID IRREVERSIBLE DAMAGE, DISCONNECT THE POWER SUPPLY TO THE CONTROL PANEL, DURING INSTALLATIO (WIRING
CABLES) OR BEFORE UNPLUG OR RE-CONNECT THE FLAT CABLE.
Only if necessary, for maintenance or installation requirements, the housing cover can be separated from its base,
first remove power supply, then disconnect the flat cable; press on the two side tabs as shown in Fig. 3. To recon-
nect it, push the flat cable into the connector, respecting the polarization, the two levers close automatically locking
it. Only then you can reconnect power supply.
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 manually breakable, according to the in-
stallation requirements, they must be drilling. To facilitate the operation, they have a centering for the drill bit.
Electrical Connection: The installation must be provided for the mains, a bipolar disconnect switch dedicated for
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 control unit does not need any hearting. The remote
sensor can be placed at a max. distance of 100 meters from the control unit with a cable of 3x1.5mm
2
or to a distance
of 200 meters using a 3x2.5 mm
2
cable. It is not necessary to use shielded cables.
Fig. 4 shows the 110÷230VAC powering connection with alarm siren and normally open manual resetting valve.
Fig. 5 shows the 110÷230VAC powering connection with alarm siren and normally closed manual resetting valve.
Fig. 6 shows the 24VDC powering connection with both 24VDC alarm siren and normally closed manual resetting
valve with, for example, our power supply unit PS180/24VDC (max load 2,5A) with No.2 internal 12V/7Ah Pb battery
to maintain the system powered on in absence of Main power supply.
Dip-Switch Setting: Before powering unit, you must set up the Dip-Switches on the housing cover board.
ENABLE/DISABLE: SW1 Dip Switches No.1, No.2, No.3, No.4 enable or disable the corresponding
input of the remote gas detector (SENSOR-1, SENSOR-2, SENSOR-3 e SENSOR-4). See Table 1.
ON = Enabled input: the detector is installed, the measurement and the Alarms and Fault relays
are in operation. (BY DEAULTS ARE ALL CONFIGURED ON)
OFF = Disabled Input the detector is absent, the display shows Sx off. Fault relays and alarms do
not intervene. (Can also be used to exclude a faulty detector or removed for maintenance).
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