BS EN 416-1-2009 pdf download.Single burner gas – fired overhead radiant tube heaters for non – domestic use Part 1 : Safety.
Components and controls shall be arranged such that they are readily accessible for adjustment. maintenance or exchange. Where necessary, access doors or removable panels shall be provided.
Parts that are intended to be removed for maintenance or cleaning shall be readily accessible, shall be simple to assemble correctly and difficult to assemble incorrectly. Such parts shall be difficult to assemble incorrectly where Incorrect assembly would create a hazardous condition or result in damage to the appliance and its controls.
Parts of the appliance which are not intended to be removed by the user and for which removal would affect safety shall be capable of removal only with the aid of tools.
5.1.4 Means of sealing
5.1.4.1 Soundness of the gas circuit
Holes for screws, studs, etc., intended for the assembly of components shall not open into the gas ways. The wall thickness between holes (including threads) and gas ways shall be not less than 1 mm,
The soundness of components and assemblies connected to the gas circuit and likely to be dismantled for routine maintenance at the consumer’s premises shall be assured by means of mechanical joints (e.g. metal to metal joints, ‘O-ring joints and packing) but excluding the use of any sealing compound such as tape, mastic or paste. The soundness shall be maintained after dismantling and re-assembly.
Sealing compounds may be used for permanent threaded assemblies. The sealing material shall remain effective under normal conditions of appliance use.
5.1.4.2 Soundness of the combustion circuit (Type B appliances)
The soundness of the combustion circuit of the appliance shall be affected by mechanical means only. with the exception of those parts which do not require to be disconnected for routine maintenance, and which may be joined with mastic or paste in such a way that permanent soundness is assured under normal condition of use.
5.1.4.3 Soundness of the combustion circuit (Type C appliances)
Parts which have to be removed during routine service and affect the soundness of the appliance andlor its ducts, shall be sealed by mechanical means, excluding pastes, liquids and tapes. The need for replacement of the seal(s), following a cleaning or servicing operation as stated by the manufacturer, is permitted.
However, parts of the assembly that are not intended to be dismantled for maintenance may be joined in such a way that permanent soundness is assured during continuous service under normal conditions of use.
The ducts, bends, if any, and the terminal or fitting piece shall fit together correctly and shall form a stable assembly. Parts intended to be dismantled for periodic servicing shall be designed and arranged so that soundness is guaranteed after re-assembly.
Any fitting piece shall allow a sound connection to be made to the system intended for the evacuation of combustion products and supply of air.
5.1.5 Supply of combustion air and evacuation of combustion products
5.1.5.1 General
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.
Unless otherwise stated, fan assisted appliances may be fitted with a means of adjustment in the combustion circuit intended to adapt the appliances to the pressure losses in the installed ducts, either by restnctors or by setting the means of adjustment to pedetermined positions in accordance with detailed instructions from the manufacturer.
According to the appliance type, the manufacturer shall supply any terminal and/or fitting piece, with the appliance for test.
If the appliance has a POCED that is capable of being installed In accordance with the manufacturer’s 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 C3 appliances), shall not undergo any permanent distortion when subjected to the wind load test specified in 4.3.2 of
EN 1859:2000.
5.1.5.2 Air supply and combustion products evacuation ducts
The assembly of the various parts during installation shall be such that no work is necessary other than adjusting the length of the air supply and combustion products evacuation ducts (possibly by cutting them). Such adaptation shall not impair the correct operation of the appliance.
It shall be possible to connect the appliance, the air supply and combustion products evacuation ducts and the terminal or fitting piece using ordinary tools if necessary. All necessary accessories and the fitting instructions shall be supplied by the manufacturer.
The terminal outlets from separate ducts for the supply of combustion air and the evacuation of
combustion products shall fit inside a square of 50 cm for Type C1 and C3 appliances.
NOTE In accordance with the national regulations sampling points in the combustion circuit may be required.BS EN 416-1-2009 pdf download.