Carel GDWBI20A00, User Manual

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9
ENG
+0300046IE - rel. 1.3 - 05.01.2022
2. INSTALLATION
IMPORTANT: the gas detector must only be installed by qualifi ed
personnel
IMPORTANT: Carel requires a bump test or calibration to be
performed immediately after installation to verify that the device is
functioning correctly. See “Calibration and bump test” for more details.
2.1 General information
The performance and overall eff ectiveness of the system strictly depend
on the characteristics of the place where the gas detector is installed. It
is therefore necessary to scrupulously comply with and carefully analyse
every detail of the installation process, including (but not limited to) the
following aspects:
•
local, state and national regulations and standards governing the
installation of gas monitoring equipment;
•
electrical standards governing the laying and connection of power
and signal cables to gas monitoring equipment;
•
all possible environmental conditions that the devices will be exposed
to;
•
the physical characteristics of the gas to be detected (in particular, its
specifi c weight);
•
the characteristics of the application (e.g. possible leakages, movement
of air, areas where gas may stagnate, high pressure areas, etc.);
•
the accessibility needed for routine maintenance and repairs;
•
the types of equipment and accessories needed to manage the
system;
•
any limiting factors or regulations that may aff ect system performance
or installations.
IMPORTANT: the installation surfaces must not be exposed to
continuous vibrations so as to prevent damage to the connections and
electronic devices.
2.2 Installation tips
CAUTION: THERE IS NO GENERAL RULE for establishing the
appropriate number of sensors and their location for each application.
Therefore, the guidelines described below are intended as support for
installers, and not as rules in their own right. Carel accepts no liability for
the installation of the gas detectors.
2.2.1 Equipment rooms
In equipment rooms, the gas detectors can be installed as follows:
•
Position the gas detectors near areas with a high concentration of
refrigerant, such as compressors, cylinders, storage tanks, pipes and
conduits. Avoid vibrating surfaces.
•
Position the gas detectors near mechanical parts such as pressure
reducers, valves, fl anges, joints (brazed or mechanical) and pipes. In
particular, above or below these in relation to the type of gas (see
below).
•
Position the gas detectors around the perimeter of the room, so as to
completely surround the equipment.
•
Position the gas detectors in all enclosed areas (stairwells, pits, enclosed
corners, etc.) where pockets of stagnant gas may form.
•
Position the gas detectors near ventilation air fl ows, both natural and
mechanical (if present).
•
Do not place the gas detectors too close to areas with high-pressure
gas, to allow this to spread in the space around the gas detector.
Otherwise the device may not detect the refrigerant leak if the fl ow
of gas is too fast.
To defi ne the installation height of the gas detector, refer to the following
images and table
2.2.2 Cold rooms
In cold rooms, position the gas detectors near the return air fl ow from
the evaporator, ideally on a side wall, but not directly in front of the
evaporator.
Where there are several evaporators, it may be possible to use one gas
detector for every two evaporators, if their positioning allows.
Finally, position the gas detectors near mechanical parts or joints such as
valves, fl anges and pipes, avoiding areas with high-pressure gas.
2.2.3 Chillers
Measuring leaks on outdoor chillers is generally more diffi cult, given the
highly-variable air fl ow.
Generally, it is recommended to install the gas detectors near the
compressor, as this is the place where refrigerant leaks are most likely to
occur. In particular, check if it is possible to install the gas detector inside
the closed unit near the compressor, where gas is more likely to stagnate.
However, avoid vibrating surfaces or surfaces that are diffi
cult to access
for maintenance.
It is also recommended to install gas detectors along the ventilation
system, especially in the event of low or variable air fl ow speeds.
2.2.4 Air conditioning - direct VRF/VRV systems
In air conditioned buildings, it is recommended to install at least one gas
detector in each room, identifying the areas of greatest risk, such as air
fl ows from ventilation systems and heating systems such as radiators.
In these spaces, the refrigerant gas is usually denser than air: consequently,
the gas detectors should be installed close to the fl oor; see the images at
the end of this paragraph.
Also consider installing the gas detector in ceilings or false ceilings, if not
adequately sealed.
Do not install the gas detectors underneath mirrors/washbasins and
inside bathrooms.
Do not install the gas detectors near sources of steam.
Recommended height for gas detector installation
Category Height Refrigerants
Refrigerant gases with high
relative density (>1) max 300 mm
from the fl oor R-32, R-134A, R-290, R-404A,
R-407A, R-407F, R-410A, R-448A,
R-449A, R-450A, R-452A, R-452B,
R-454A, R-454B, R-455A, R-466A,
R-507A, R-513A, R-744 (CO2),
R-1233ZD(E), R-1234YF,
R-1234ZE(E), R-1270
Refrigerant gases with low
relative density (<1) max 300 mm
from the ceiling R-717 (NH3), R-1150 (ETHYLENE)
Tab. 2.a