General safety references

The design, operation and maintenance of refrigeration systems with flammable refrigerants are subject to particular safety regulations. They include, among others, special safety devices against exceeding the pressure and particularities in the design and arrangement of the electrical operating equipment.

Moreover, measures must be taken that guarantee risk-free ventilation in the event of a refrigerant leak, to prevent the formation of an ignitable gas mixture. The specifications are established in standards (e.g. EN378, ISO5149). However, in view of the high requirements and product liability, a risk assessment by a notified body or jointly with a notified body is in general recommended.

Depending on the design and the refrigerant charge, an assessment according to EU Framework Directives 2014/34/EU (ATEX 95) and 1999/92/EC (ATEX 137) may be necessary. The operation of the system and personal protection are usually subject to national regulations on product safety, operating reliability and accident prevention. To this end, separate agreements between the contractor and the end user must be made. The required risk assessment of the system must be prepared by the system manufacturer. However, the hazard assessment for installation, operation and maintenance of the system is the responsibility of the end user.

Risk of explosion and thus danger to life if refrigerant leaks and in the presence of an ignition source!
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Risk of explosion and thus danger to life if refrigerant leaks and in the presence of an ignition source!

A refrigerant can ignite and also form an explosive atmosphere depending on its concentration in the air!

Avoid open fire and ignition sources in the machinery room and in the hazardous zone!

If it is guaranteed that the compressor will not be operated in an Ex zone, an ATEX or Ex design is not required.

This can be guaranteed, for example, by: