BS 5990:2006 pdf download
BS 5990:2006 pdf download.Specification for directgas-fired forced
convection air heaterswith rated heat inputsgreater than 330 kW butnot exceeding 2 MW forindustrial and commercialspace heating -Safetyand performance requirements (excludingelectrical requirements)(2nd family gases).
7.1.11 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.
The fittings of suitable hinges is deemed to satisfy this requirement.
7.1.12 Unions and flanges
Unions in fuel gasways shall be of the cone or spherical-seated type. Flange joints 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.
7.1.13 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.
7.1.14 Air strainer
A strainer shall be fitted on the air inlet, to the appliance. The maximum strainer hole (limension shall be not less than 6.5 mm, nor shall it permit the entry of a ball of diameter 16 mm applied with a force of5N.
The strainer shall be readily accessible for cleaning or replacement; it may be of the cleanable or throw-away type.
7.1.15 Air inlets
Air heaters, other than portable air heaters, shall have flanged or spigot connections on the air inlet.
7.1.16 Air outlets
The air outlet(s) of a ductless heater, other than a transportable heater, shall be fitted with directional louvres that are capable of justment between horizontal discharge and (llscharge at an angle of at least 45° downwards from the horizontal. When the louvres are in the position of maximum closure, the minimum 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.
7.1.17 Facility for remote control
Appliances shall be capable of being controlled remotely by means of thermostats and a time control.
7.1.18 Durability of protective finishes
7.1.18.1 General
Materials that are used for the construction of parts that are not normally subject to service and maintenance shall be adequately protected against corrosion.
7.1.18.2 Galvanized parts
Galvanized parts shall conform to the requirements of BS EN ISO 1461, BS EN 10143 or BS 4921 as appropriate.
Galvanized parts, or samples thereof, shall be sub.jected to nondestructive tests as specified in BS EN 12329, or other relevant standards, and shall conform to the requirements specified in those standards.
7.1.18.3 Painted and plastics coated parts
Painted or plastics coated surfaces shall conform to the following requirements.
a) Resistance to heating. There shall be no appreciable change of colour on any part of the appliance and the finish shall not become tacky or show other signs of (letenoration at the end of the drying out period as specified in 6.2.
This requirement does not apply to parts that conic into direct contact with the flame.
b) Resistance to abrasion. Surfaces shall be tested for resistance to scratciung. The hardness shall be such that the protective film is not penetrated when subjected to the following test. The scratch shall not have a width greater than 1 mm at an.y pomt along its length.
Method. Apply the apparatus (see Figure 1) to the surface under test and move the ball, after loading with a force of 10 N, at 30 mm/s to 40 nun/s relative to the surface. If the indicator lamp lights, the surface is deemed to have been penetrated.
