14
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Unit installation
Installer and user reference guide
62
LREN8~12A7 + LRNUN5A7
CO₂ ZEAS outdoor unit and capacity up unit
4P704142-1 – 2022.08
Access category
Description
Examples
Authorized access
Rooms, parts of buildings, buildings
where only authorized persons have
access, who are acquainted with
general and special safety precautions
of the location and where
manufacturing, processing or storage of
material or products take place.
Manufacturing facilities, e.g. for chemicals,
food, beverage, ice, ice cream, refineries,
cold stores, dairies, abattoirs, non-public
areas in supermarkets.
14‒2 Description of location classification
Location classification
Description
Class I
Mechanical equipment
located within the occupied
space
If the refrigerating system or refrigerant-containing parts are located
in the occupied space, the system is considered to be of class I, unless
the system complies with the requirements of class II.
Class II
Compressors in machinery
room or open air
If all compressors and pressure vessels are either located in a
machinery room or in the open air, the requirements for a class II
location shall apply, unless the system complies with the
requirements of class III. Coils and pipework including valves may be
located in an occupied space.
Class III
Machinery room or open air If all refrigerant-containing parts are located in a machinery room or
in the open air, the requirements for a class III location shall apply.
The machinery room shall fulfil the requirements of EN 378-3.
Class IV
Ventilated enclosure
If all refrigerant-containing parts are located in a ventilated
enclosure, the requirements for a class IV location shall apply. The
ventilated enclosure shall fulfil the requirements of EN 378-2 and EN
378-3.
Appropriate measures
INFORMATION
Appropriate measures are field supply. Choose and install all required appropriate
measures in accordance with EN 378-3:2016.
▪
(natural or mechanical) ventilation
▪
safety shut-off valves
▪
safety alarm, in combination with a CO
2
refrigerant leak detector (a safety alarm
alone is NOT considered an appropriate measure where occupants are restricted
in their movements)
▪
CO
2
refrigerant leak detector
WARNING
Install the unit ONLY in locations where the doors of the occupied space are NOT
tight fitting.
WARNING
When using safety shut-off valves, make sure to install measures such as a bypassing
piping with a pressure relief valve (from liquid pipe to gas pipe). When the safety
shut-off valves close and no measures are installed, increased pressure may damage
the liquid piping.
