Carel GDWB User Manual Download

Page: 33 / 52

ENG

+0300046IE - rel. 1.2 - 14.01.2021

2. INSTALLATION

IMPORTANT:

the gas detector must only be installed by qualified

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 effectiveness 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
specific 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 affect 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, flanges, 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 flows, 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 flow
of gas is too fast.

To define 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 flow 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, flanges and pipes, avoiding areas with high-pressure gas.

2.2.3 Chillers

Measuring leaks on outdoor chillers is generally more difficult, given the
highly-variable air flow.

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 difficult 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 flow 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
flows 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 floor; 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