KB-200-5
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5.2
Use of flammable refrigerants of the A2L
safety group (e.g. R1234yf)
Information
The information in this chapter about the use of
refrigerants of the A2L safety group refer to
European regulations and directives. In regions
outside the EU, observe the local regulations.
This chapter describes the additional residual risks
posed by the condensing unit when using class A2L re-
frigerants and provides explanations. This information
helps the system manufacturer carry out the required
risk assessment. The information alone can in no way
replace the risk assessment for the system.
Design, maintenance and operation of refrigeration sys-
tems using refrigerants of the A2L safety group are
subject to particular safety regulations.
When installed in accordance with these operating in-
structions and under normal operating conditions
without malfunction, the components of these condens-
ing units are free from ignition sources that could ignite
the flammable refrigerants of the A2L safety group.
They are considered technically tight. The condensing
units are not designed for operation in an Ex zone.
Information
When using a flammable refrigerant:
Affix the warning sign “Warning: flammable ma-
terials” (W021 according to ISO7010) well vis-
ibly to the compressor. An adhesive label show-
ing this warning sign is enclosed with the Oper-
ating Instructions.
The combustion of refrigerant in the compressor’s ter-
minal box can only happen when several very rare er-
rors occur simultaneously. The probability of this event
occurring is extremely low. Combustion of fluorine-
based refrigerants can release lethal amounts of toxic
gases.
DANGER
Life-threatening exhaust gases and residues of
combustion!
Sufficiently ventilate the machinery room for at
least 2 hours.
Never inhale combustion products.
Use appropriate, acid-resistant gloves.
In case of suspected burnt refrigerant in the terminal
box of the compressor:
Do not enter the place of installation and ventilate it for
at least 2 hours. Do not enter the place of installation
until the combustion gases have completely escaped.
Never inhale combustion products. The potentially toxic
and corrosive exhaust air must be released into the at-
mosphere. It is necessary to use suitable, acid-resistant
gloves. Do not touch moist residues, but allow them to
dry, because they may contain dissolved toxic sub-
stances. Have trained staff clean the parts concerned
or, if the parts are corroded, dispose of them properly.
5.2.1
Use restrictions for flammable refrigerants
For flammable refrigerants of safety group A2L, only
condensing units whose liquid receivers or water-
cooled condensers are identified by the label "Fluid
Group 1 + 2" on the name plate can be used; further re-
strictions vary depending on the configuration.
Not approved for flammable refrigerants:
• Condensing units with condenser type LH265E
• Condensing units with 2-stage compressors
• Configurations with:
– Check valve > DN25, or with oil separator and
check valve > DN25
– Filter drier, screwed
– Pressure switch KP17..
5.2.2
Condensing unit and refrigeration system
requirements
The specifications are established in standards (e.g.
EN378). In view of the high requirements and product
liability, it is generally advisable to conduct the risk as-
sessment in cooperation with a notified body. Depend-
ing on the design and the refrigerant charge, an as-
sessment according to EU Framework Directives
2014/34/EU and 1999/92/EC (ATEX 137) may be re-
quired.
DANGER
Fire hazard in the event of refrigerant leakage
and in the presence of an ignition source!
Avoid open fire and ignition sources in the en-
gine room and in the hazardous zone!
▶ Pay attention to the ignition point in air of the refri-
gerant used, see also EN378-1.
▶ Vent engine room according to EN378 or install an
extraction device.
▶ To open the pipelines, use only pipe cutters and no
open flame!
▶ Install components from which refrigerant may leak
(e.g. low and high pressure limiter or low and high
pressure cut-out) only outside the switch cabinet!
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