BS 5991:2006 pdf download
BS 5991:2006 pdf download.Specification for indirect gas fired forced
convection air heaters with rated heat inputs greater than 330 kW but not exceeding 2 MW for industrial and commercial space heating -Safetyand performance requirements (excluding electrical requirements)( 2nd family gases).
7.1.15 Panel anchorage
Panels that are normally removed for servicing shall be fitted with anchor lines where the appliance is intended to be installed other than at floor level. This requirement shall be deemed to be satisfied if suitable hinges are fitted.
7.1.16 Unions and flanges
Unions in fuel gasways shall be of the cone or spherical-seated type. Flange .joirts shall include a gasket resistant to the action of components of the gas and suitable for the temperature to which it. is likely to be exposed.
7.1.17 Flexible pipes
Flexible pipes shall be metal armoured and have screwed or flanged connections. Flexible pipes shall withstand at least three times the working pressure with a minimum of 3.5 bar at both maximum and minimum service temperatures. There shall be electrical continuity across Such pipes. There shall be a manual isolating valve in a readily accessible position upstream of the inlet of any section of flexible pipe.
7.1.18 Components and controls
Components and controls fitted to the appliance shall conform to the requirements of relevant. British Standards.
Gas-carrying controls shall be sited externally to the air duct so as to prevent, ingress of gas into the discharged air.
Where controls are enclosed in a separate compartment, the compartment shall be adequately ventilated. The vent shall be so sited that it cannot be obstructed by foreign matter, birds, etc.
Bypasses shall not be provided around any item of safety equipment.
7.1.19 Air inlets
Where the inlet air is intended t.o be ducted t.o the heater, the appliance shall be provided with flanged or spigot. connections on the air inlet. If necessary the manufacturer shall supply a suitable adaptor in order to meet this requirement.
7.1.20 Air outlets
The air outlet(s) of a ductless heater shall be fitted with directional louvres that. are capable of adjustment between horizontal discharge and discharge at an angle of at. least 45° downwards from the horizontal. When the louvres are in t.he position of maximum closure, the mininuim requirements for functional purposes shall be satisfied.
Ducted air heaters shall have air outlets equipped with flanges or spigots to facilitate connection of ductwork or flexible connectors.
7.1.21 Facility for remote control
Appliances shall be capable of being controlled remotely by means of thermostats and a time control.
Alter the initial burnmg-oll period the appliance shall not give rise to any unpleasant smell.
7.1.25 Disposal of condensate
An appliance with a claimed thermal efficiency in excess of 92% (based on the net calorific value) shall be provided with means for collection and disposal of condensate.
7.2 Appliances designed for permanent outdoor installation
7.2.1 General
Appliances designed for permanent outdoor installation shall be so constructed that they are fully protected against the rigours of the environmental conditions under which they are expected to operate.
iVOTE The top of ouidoo’r units should prçferabiy be so shaped as to prevent the collection of watei
7.2.2 Combustion air inlets
Combustion air inlets shall be so sited that their lowest edge is at least. 500 mm above the base of the appliance, or 500 mm above floor level if this is specified in the manufacturers installation instructions.
Air inlets shall be so designed as to avoid accidental blockage.
7.2.3 Ventilation
The appliance and its casing shall be adequately ventilated.
7.2.4 Access panels and doors
Access Panels and doors and such insulation as needs to be removed dunng normal servicing shall be so designed that repeated removal and replacement does not damage or impair the weatherproofing of the appliance.
