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2 | Safety instructions for use of
flammable refrigerants
2.1 Safety instructions
DANGER
D
GB
F
E
INFO
2.2 Qualifications required of personnel
6
• Explosion and fire risk! Hydrocarbons and synthetic HFO
refrigerants are colourless, combustible gases which
occur naturally and which are explosive in a certain blend!
• Hydrocarbons are classified into the safety group A3 (highly-
inflammable refrigerant) according to EN 378.
• HFO refrigerants are classified into the safety group A2L (hardly-
inflammable refrigerant) according to EN 378.
As they are heavier than air, the operating location must be above
ground level to allow unrestricted discharge of the gas.
• By means of a risk and hazard analysis, appropriate technical
measures are to be identified in order to achieve sufficient risk
reduction. If necessary, a classification of the hazardous areas
according to EN60079-10-1 should be carried out. If the refriger-
ant concentration exceeds the value of 25% of the lower flamma-
bility limit (LEL), all equipment in the hazardous area which is not
permitted for operation in hazardous areas must be immediately
switched off without any voltage.
• Use only suitable equipment approved for flammable refrigerants.
• Observe the national regulations.
Semi-hermetic compressors are to be classified as "technically
tight" (see e.g. TRBS 2152 part 2 / TRGS 722).
WARNING
Inadequately qualified personnel poses the risk of accidents, the
consequence being serious or fatal injury. Work on compressors
is therefore reserved for personnel which is qualified in handling
flammable refrigerants.
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