EsiWelma Sensigas UCE18 Installation Instructions

EsiWelma
Istruzioni di installazione
it
Installation instructions
en
Instruction de installation
fr
en English
These instructions must be kept together with the device.

General Information

The

installation,

the periodical
replacement must be done by qualified technicians.
The installation of a gas leak detection system for methane or
liquid petroleum gas (LPG), do not exempt from the compliance
to the safety rules and to all the laws in force concerning the
installation and the use of gas-operating-devices, for the
ventilation of the rooms and for the discharge of flue gases.
Installation

Mounting position

Check that environmental specifications of the installation place are
compatible with the values listed on Technical Data.
Control Unit UCE18
A on DIN bar (EN50022-35 x 7.5) min length 170mm
B on wall, with 2 screws
C on panel front end using a DIN bar length 195mm,
n°2 50mm spacers, screws and washers
A
Sensors UR.13/A

On wall in an area subject to natural air circulation.

Never close to water jets, suction grids, windows, openings,
etc.

At a suitable distance from gas devices in order to avoid
unexpected system actions due to functional losses.

In an accessible position for controls and inspections.
s
QAG13/A
EsiWelma s.r.l.
®
® s.r.l.
Centralina rivelazione fughe gas
Gas leak detection system
Système de détection de fuite de gaz
inspections, or the
B C
Respect the correct mount orientation
in order to ensure the
convection air flow inside the sensor.
E191.604_En Rev. 4 dated 30/11/2018
URG13/A:
URG13.P/A:
URO13/A:
NOTE for sensor installation
In case of a new plant the sensors should be installed as latest as
possible so that typical working-place activities (particularly welding,
painting, etc.) cannot damage the sensors (particularly their sensing
element). In any case the installation must be completed before gas
devices and gas appliances are activated.
devices

Wiring

Common electric cables can be used. However, when installing in
places subject to high electromagnetic interference, use of shielded
cables is recommended.
The UCE18 must be permanently powered at 24VAC.
There is no protection against accidental connection with
230V on the 24V side.
Use double insulation safety transformers; they should be sized for
continuous operation at rated power (refer to Technical Data).

Comply with all current regulations for wiring

Connections must be done in accordance with the diagrams
reported in the following operating instructions

Conform to indicated cable length and cross section

Connect only valves at 12VDC with power not greater than 13W
each (total max 26W) to EV output

Internal relays with positive logic operation that is always
energized contact in case of alarm or fault absence.
Never touch for any reason the sensing element or
electronic circuit. Any tampering might compromise
the correct system operation.

Commissioning

UCE18 does not require any programming or parameterization.

Check that sensors are suitable for the gas type to be detected:

URG13/A = Methane sensor

URG13.P/A = LPG sensor

URO13/A = Carbon Monoxide (CO) sensor

Check that power absorbed by any devices connected to relay
terminals is lower than or equal to contacts maximum ratings
(please refer to Technical Data).

Make certain that termination resistors R=18Kohm 1/4W, factory
supplied, are disconnected from used sensor inputs, while they
must be connected to any unused sensor inputs (terminals C-
S).

If no valve should be connected to EV output, insert a valve
normal
termination Rv 1.8Kohm 1/2W (factory supplied) in the EV ter-
minal. This will avoid any wrong valve fault signal.
High, 20...30cm from the ceiling, to detect light gases
like methane, etc.
Low, 20...30cm from the floor, to detect heavy gases
like LPG, propane, butane etc.
At about 1,5m from the floor, to detect carbon
monoxide (CO)
E191.604_En
Sensigas®
UCE18
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