3
G 521 - RFG 361
C1 Eng. 25.11.08 MZ Rev. 02
We reserve the right to make changes without notice
COSTER
6. SITING OF DEVICE
6.1 Detector
This must be sited in a dry space which meets the relevant ambiental requirements given in section 5.
If installed in a location classified as “Hazardous” it must be installed in a cabinet for electrical equipment con
-
structed according to the regulations in force for the class of danger concerned.
The controller can be mounted on a DIN rail and housed in a standard DIN enclosure.
6.
2 Sensors
The correct siting of the sensor is fundamental for the correct functioning of the system. The position depends on
the type of gas to be monitored and, in particular, on its density in respect of air
:
• Methan
e (gas lighter than air which therefore tends to rise).
Position: at a distance of 10…50 cm from the ceiling and, in any event, above doors or windows
.
• Propane-LPG (gas heavier than air which tends to move downwards).
Position: at a distance of 10…50 cm from the floor
.
• Carbon monoxide (CO) (gas with a density very similar to that of air and which therefore tends to diffuse
uniformly). Position: at a height of 150…200 cm from floor
.
Moreover, to ensure the correct operation of the detector and to avoid useless alarms due to a casual and momen
-
tary presence of gas, the sensor must NOT be positioned
:
– less than 1…2 metres from boilers or water heaters
,
– less than 2…3 metres from kitchen ranges and ovens
,
– in spaces where air movement could be hindered (e.g. in corners or enclosed spaces)
,
– near to doors or windows
,
– in places where dust or dirt could contaminate the sensor and so render it ineffective
,
– in places subject to possible sprays of water, particularly sensors positioned near the floor
,
–in places where the temperature or humidity could be outside the limits stated in "TECHNICAL DATA".
6.
3 Solenoid shut-off valve
This must be installed on the gas distribution pipe, taking the following precautions
:
– if possible, in a different space from the one being controlled
,
– in an easily-accessible place, especially for the valves which have to be reset manually
,
– if installed outside, it must be protected against the weather
,
– in installations with external propane (LPG) gas tank, it must be installed downstream of the pressure-reducing
valve (30…40 mbar).
.
7. ELECTRIC WIRING
IMPORTANT: the detection system must always be in operation, so that the electric power supply to the detector
must come directly from the mains supply, without the interposition of switches or other devices
which could accidentally cut it off.
To carry out the wiring, proceed as follows
:
– separate the base from the cover
,
– mount the base on the DIN rail and check that the securing elements (3.
4) anchor it firmly,
– carry out the wiring as in the diagram and in accordance with the safety regulations, using the following
cables
:
• 1,5 mm
2
cross-section for power and relay control outputs,
• 1 mm
2
cross-section for the sensor positioned up to a maximum distance of 50 meters; or 1.5 mm2 cross-
section for the sensor positioned up to a maximum distance of 75 meters
,
– carry out the “Jumper functions” to adapt the detector to the desired type of operational control
,
– switch on power (230 V~) and check its presence at terminals L and N
,
– switch off power, replace cover on base and secure it with the two screws supplied(3.
3)
You are advised not to insert more than two cables in a single terminal of the detector and, if necessary, to use an
external terminal block.
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