EN 12309-2:2026

Gas-fired sorption appliances for heating and/or cooling with a net heat input not exceeding 70 kW - Part 2: Safety

Publication date:   Aug 24, 2026

Scope

1.1 Scope of EN 12309 series
Appliances covered by this EN 12309 series include one or a combination of the following:
- gas fired sorption chiller;
- gas fired sorption chiller/heater;
- gas fired sorption heat pump.
This EN 12309 series applies to appliances only when used for space heating and cooling with or without heat recovery.
This EN 12309 series applies to appliances having flue gas systems of type B and C (according to EN 1749:2020) and to appliances designed for outdoor installations, including type A. EN 12309 does not apply to air conditioners, it only applies to appliances having:
- integral burners under the control of fully automatic burner control systems;
- closed system refrigerant circuits in which the refrigerant does not come into direct contact with the water or air to be cooled or heated;
— mechanical means to assist transportation of the combustion air and/or the flue gas.
The above appliances can have one or more primary or secondary functions (i.e. heat recovery - see definitions in EN 12309-1:2023). In the case of packaged units (consisting of several parts), the standard applies only to those designed and supplied as a complete package.
The appliances having their condenser cooled by air and by the evaporation of external additional water are not covered by this document.
Installations used for heating and/or cooling of industrial processes are not within the scope of these standards.
NOTE All the symbols given in this text are used regardless of the language used.
1.2 Scope of this document
This document deals with the safety of gas-driven sorption appliances for heating and/or cooling having net heat input not exceeding 70 kW as defined in EN 12309-1:2023. It only applies to appliances:
1) where the temperature of the water does not exceed 105 °C during normal operation;
2) where the maximum operating pressure in the water circuit does not exceed 6 bar;
3) types B12, B13, B22, B23, C12, C13, C32, C33 and C63;
4) for outdoor installations, including type A appliances.
This document does not include specific requirements on surface temperatures of external parts particular to children and elderly people.