EN 778-2009 pdf download.Domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 70 kW, without a fan to assist transportation of combustion air and/or combustion products.
5.1.7.2 Appliance flue gas outlet
The cross-section of the appliance flue gas outlet shall not be adjustable.
If the appliance has a POCED that is capable of being installed in accordance with the manufacturers instructions such that its outlet, when fitted with any terminal supplied with the appliance, or specified in the manufacturer’s instructions, extends beyond the external surface of a building by more than 1.5 m, this duct, together with any associated air supply duct (Type C1 and C appliances), shall not undergo any permanent distortion when subjected to the wind load test specified in 4.32 of EN 1859:2000.
5.1.7.3 Type B1,, BIIAS, B11 and appliances
All appliances shall be designed so that there is an adequate supply of combustion air during ignition and over the whole range of possible heat inputs stated by the manufacturer.
Connection to the flue shall be made by means of a flue outlet preceded by a draught diverter. This device Is part of the appliance. The flue outlet shall be female and shall allow, if necessary by means of an adaptor supplied with the appliance, connection to a flue pipe whose diameter complies with the standards in force where the appliance is to be installed (see A.7). The internal diameter of the flue outlet shall be such as to ensure compliance with requirements concerning operation. It shall be possible to insert a flue pipe of nominal external diameter (0- 2) mm to a depth of at least 0/4 (where 0 is the internal diameter of the flue outlet) but not so far that the evacuation of the combustion products is impaired.
Appliances shall be constructed to prevent release of combustion products in a dangerous quantity into the installation room under abnormal draught condition (see 6.2.8 and 6.2.9). To meet this requirement. Type B11 appliances shall be factory fitted with a suitable device; In this case the appliance is designated as a Type
or B1185 appliance, according to the device (see 4.2.2.1 for dassifications).
However, appliances intended to be installed in a place separated from living rooms and provided with appropriate ventilation directly to the outside need not carry such a device, but In this case, appropriate warnings on the packaging and in the instructions shall clearly indicate the limit on the use of this type of appliance; in this case the appliance is designated as a Type B11 appliance.
The device shall be an integral part of the appliance and resist the thermal, chemical and mechanical effects occurring in normal use. The device shall be protected by the manufacturer against adjustment The combustion products discharge safety device shall be so designed that it cannot be dismantled without a tool. It shall be difficult to fit the device incorrectly after servicing.
5.1.7.4 Type 841 appliances
The draught diverter shall either be integral with the appliance or be supplied with the appliance by the manufacturer.
The POCED shall either be supplied with the appliance by the manufacturer or specified in the manufacturer’s instructions. The specification shall include a description of the duct including any bends, its materials of construction and any critical tolerances (e.g. in length, diameter, thickness, insertion depth).
Appliances shall be constructed to prevent release of combustion products in a dangerous quantity into the installation room under abnormal draught condition (see 6.2.8 and 6.2.9). To meet this requirement. Type Bt appliances shall be factory fitted with a suitable device; in this case the appliance is designated as a Type B41 or B4IBS appliance, according to the device (see 4.2.2.1 lot dassificatioris).
However, appliances intended to be installed in a place separated from living rooms and provided with appropriate ventilation directly to the outside need not carry such a device, but in this case, appropriate warnings on the packaging and in the instructions shall clearly indicate the limit on the use of this type of appliance: in this case the appliance is designated as a Type 841 appliance.
The device shall be an integral part of the appliance and resist the thermal, chemical and mechanical effects occurring in normal use. The device shall be protected by the manufacturer against adjustment. The combustion products discharge safety device shall be so designed that it cannot be dismantled without a tool. It shall be difficult to fit the device incorrectly after servicing.
5.1.7.5 Type C,, appliances
5.1.7.5.1 Flue terminal and ducts
The terminal shall be supplied by the appliance manufacturer and any necessary combustion air and combustion products ducts shall be described in the installation instructions.
The flue system shall be designed taking into account the possible penetration of rain or snow.
An opening in a terminal shall not permit the entry of a ball of 16 mm diameter when applied with a force of 5 N. EN 778-2009 pdf download.