ÖNORM EN 778

This standard specifies the requiremenh and test methods for the safety and efficiency of domestic gas-fired air heaters with (an) atmospheric burner(s) and without a fan to assist the transportation of combustion air andlor flue gases, hereafier referred to as "appliances". This standard applies to Type B11, B11AS, B11BS, C11, C21, C31 and C41 appliances with an input not exceeding 70 kW (net cv-basis), intended primarily for use in single unit residential dwellings. Provision of the heated air may be by means of ducting. This standard does not apply to: appliances of the condensing type; appliances for outdoor installation; dual purpose air conditioning appliances (heating and cooling); appliances where the air is heated by an intermediate fluid; appliances with forced draught burners; appliances fitted with a manual or automatic means of adjusting the combustion air supply or the combustion products evacuation (including flue dampers); portable or transportable forced convection appliances; appliances having multiple heating units with a single draught diverter; appliances fitted with more than one flue outlet; C21 and C41 appliances for 3rd family gases. NOTE: For C41 appliances: See all requirements and test methods that are valid for C21 appliances, unless otherwise stated. This European Standard Covers type-testing only.