2015DIN EN 12309-1:2015 Gas-fired sorption appliances for heating and/or cooling with a net heat input not exceeding 70 kW - Part 1: Terms and definitions; German version EN 12309-1:2014
1999DIN EN 12309-1:1999 Gas-fired absorption and adsorption air-conditioning and/or heat pump appliances with a net heat input not exceeding 70 kW - Part 1: Safety; German version EN 12309-1:1999
1988DIN 33830-2:1988 Heat pumps; complet absorption pump units; requirements for combustible gases, tests