1、BRITISH STANDARD BS3376:1994 Specification for Open fires burning solid mineral fuels with convection, with or without boilersBS3376:1994 This British Standard, having been prepared under the directionof the Refrigeration, Heating and Air Conditioning Standards Policy Committee, waspublished under t
2、he authorityof the Standards Boardand comes into effect on 15 June 1994 BSI 05-1999 First published May 1962 Second edition September 1982 Third edition June 1991 Fourth edition June 1994 The following BSI references relate to the work on this standard: Committee referenceRHE/28 Draft for comment89/
3、75667DC ISBN 0 580 22802 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Refrigeration, Heating and Air Conditioning Standards Policy Committee (RHE/-) to Technical Committee RHE/28, upon which the following bodies were represented: As
4、sociation of British Solid Fuel Appliance Manufacturers Association of Building Engineers British Coal Corporation British Fuel and Chimney Manufacturers Association Consumer Policy Committee of BSI Department of the Environment HETAS Ltd. Low Temperature Coal Distillers Association of Great Britain
5、 Ltd. METCOM National Fireplace Council Manufacturers Association Waterheater Manufacturers Association Amendments issued since publication Amd. No. Date CommentsBS3376:1994 BSI 05-1999 i Contents Page Committees responsible Inside front cover Foreword iii Section 1. General 1.1 Scope 1 1.2 Referenc
6、es 1 1.3 Definitions 1 1.4 Classification 2 Section 2. Construction 2.1 General 4 2.2 Minimum dimensions for category b) appliances 4 2.3 Firefront 4 2.4 Bottomgrate 4 2.5 Combustion air control 4 2.6 Ashpan 5 2.7 Ashpit and ashpit cover 5 2.8 Front firebars and fallplate 5 2.9 Deepening bar 6 2.10
7、Deepening plate 6 2.11 Gas ignition burner 6 2.12 Boiler 8 2.13 Boiler flue 8 2.14 Throat restrictor 8 2.15 Convection chamber and airways 9 2.16 Tools 10 2.17 Electrical 10 Section 3. Performance 3.1 Thermal performance 11 3.2 Banking performance 11 3.3 Condition of appliance after test 11 3.4 Thro
8、at restrictor 11 Section 4. Instructions and marking 4.1 Instructions 14 4.2 Marking 14 Annex A (normative) Test methods and conditions 15 Annex B (normative) Test fuels 19 Figure 1 Typical inset open fire showing ash shedding area 3 Figure 2 Example of a suitable aeration device for a natural gas i
9、gnition burner 7 Figure 3 Gas connection elbows 8 Figure 4 Schematic diagram of boiler flue mouth entry 9 Figure A.1 Datum level for various types of open fire 16 Table 1 Materials for construction of appliance components 5 Table 2 Minimum dimensions for category b) appliances 5 Table 3 Minimum ashp
10、an capacity 5 Table 4 Relationship between gas ports and air ports 6 Table 5 Range of adjustment of throat restrictor 9BS3376:1994 ii BSI 05-1999 Page Table 6 Materials and minimum thickness of convection chamber and airways for appliances without fan assisted convection air 10 Table 7 Materials and
11、 minimum thickness of convection chamber and airways for appliances with fan assisted convection air 10 Table 8 Performance of categorya) appliances burning test fuel A or B 12 Table 9 Performance of categoryb) appliances burning test fuel A or B 13 Table 10 Performance of categoryb) appliances burn
12、ing test fuel C and designated as suitable for burning bituminous coal at enhanced efficiency 13 List of references Inside back coverBS3376:1994 BSI 05-1999 iii Foreword This British Standard has been prepared under the direction of the Refrigeration, Heating and Air Conditioning Standards Policy Co
13、mmittee and supersedes BS3376:1991 which is withdrawn. This standard has been revised as a result of revisions to other standards referred to in the text, to prevent duplication and to reflect the latest information. A British Standard does not purport to include all the necessary provisions of a co
14、ntract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesitoiv, pages1to20, an inside back cover
15、and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankBS3376:1994 BSI 05-1999 1 Section 1. General 1.1 Scope This British Standard specifies constructional, dimen
16、sional and performance requirements for inset or freestanding open fires giving space heating by convection in addition to radiation and designed to burn solid mineral fuels (i.e.bituminous coal, Welsh dry steam coal, anthracite or manufactured fuels derived from these coals). NOTEThis standard does
17、 not apply to inset open fires without convection (seeBS4834). The standard covers appliances of nominal widths350mm,400mm,450mm,500mm and550mm designed for use either with fireplace components specified in BS1251 or with special fireplace components or boilers supplied with the appliance. The essen
18、tial components of appliances covered by this standard are the firefront, bottomgrate, ashpit cover, ashpan, means of primary air control and a convection chamber. Specified optional features may comprise a deepening bar, deepening plate, front firebars, undergrate gas igniter, boiler and throat res
19、trictor. Fan(s) may be incorporated for supplying combustion air and/or convection air. Appliances are designated as either intermittent or overnight. 1.2 References 1.2.1 Normative references This British Standard incorporates, by dated or undated reference, provisions from other publications. Thes
20、e normative references are made at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this British Standard only when inco
21、rporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 1.2.2 Informative references This British Standard refers to other publications that provide information or guidance. Editions of these publi
22、cations current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 1.3 Definitions For the purposes of this British Standard, the definitions given in BS1846-1, BS6100-1.5.1, BS3250-1 and BS3323 apply together with the foll
23、owing. 1.3.1 effective grate area the area Y in the plane of the bottomgrate, enclosed by the back and sides of the firebox and by the firefront, when the appliance is installed in accordance with the manufacturers instructions (seeA.4.5) 1.3.2 rectangular bottomgrate a bottomgrate, the sides of whi
24、ch form a rectangle 1.3.3 tapered bottomgrate a bottomgrate, the sides of which form a trapezium 1.3.4 normal output boiler a boiler designed to give a water heating output level of at least2.3kW but less than3.5kW at the target burning rate 1.3.5 high output boiler a boiler designed to give a water
25、 heating output level of at least3.5kW at the target burning rate 1.3.6 target burning rate a designated rate of fuel consumption (on a dry basis), depending upon the nominal width and category of the appliance under specified test conditions 1.3.7 ash shedding area the area Z within the frame of th
26、e bottomgrate, as shown in Figure 1a) or Figure 1b), comprising the projected area of the firebars and the spaces between the firebars in the plane of the bottomgrate (seeA.4.5) 1.3.8 firefront the structure that forms the front of the appliance and which may also be decorativeBS3376:1994 2 BSI 05-1
27、999 1.3.9 ash collection area the maximum area X of the ashpan capable of collecting ash, unless ash deflectors or similar design features are fitted. In this case, the ash collection area X includes the projected area of those parts of the deflectors, etc., that do not overlap the ashpan when it is
28、 in place (seeA.4.5) 1.4 Classification For the purposes of this standard, appliances are categorized as follows. a) Appliances with a tapered bottomgrate seeFigure 1a): 1) without a boiler; 2) with a boiler designed for normal output; 3) with a boiler designed for high output (seenote). b) Applianc
29、es of minimum nominal width400mm (see note), with a rectangular bottomgrate see Figure 1b), with a boiler designed for high output. This category includes appliances designated as capable of burning bituminous coal at enhanced efficiency. This category excludes intermittent appliances. NOTEAppliance
30、s with a rectangular bottomgrate which do not conform the dimensions given in Table 2 and Table 3 are treated as categorya)3) appliances.BS3376:1994 BSI 05-1999 3 Figure 1 Typical inset open fire showing ash shedding areaBS3376:1994 4 BSI 05-1999 Section 2. Construction 2.1 General The components of
31、 the appliance shall be made from the material indicated in Table 1. Component parts which require periodic replacement shall be either designed or marked to ensure correct fitting (seesection4). NOTESuch parts should be easily replaceable. 2.2 Minimum dimensions for categoryb) appliances Categoryb)
32、 appliances shall conform to the minimum dimensions given in Table 2, determined in accordance withA.4.3 andA.4.5.2. NOTEAppliances with a rectangular bottomgrate that do not conform to Table 2 are considered to be categorya)3) appliances (see1.4). 2.3 Firefront Means shall be provided for rigidly f
33、ixing the firefront either directly or indirectly to either the back hearth or the boiler. The width of that part of the firefront designed to fit within the tiled surround (dimension D in Figure 1) shall be the nominal width of the appliance mm. 2.4 Bottomgrate 2.4.1 General The bottomgrate shall b
34、e designed to fit either a fireback conforming to BS1251 or a purpose-made fireback or boiler. It shall be capable of being removed and shall be either designed or marked to ensure correct fitting. The bottomgrate shall consist of a series of firebars and the width of the space between the bars shal
35、l be13mm 2mm. NOTEThe bottomgrate should be supported in such a way as to offer minimum obstruction to the removal of ash. 2.4.2 Assembly If the appliance is supplied with its own fireback or boiler, it shall be assembled in accordance with the manufacturers instructions. Otherwise it shall be assem
36、bled and installed in a model fireback (e.g.constructed from wood) conforming to the mean dimensions specified in BS1251 with a tolerance of 1mm. NOTEIf adjustable, the bottomgrate may be trimmed to the most appropriate dimensions, in accordance with the manufacturers instructions. 2.4.3 Appliances
37、without underfloor air supply When assembled as described in2.4.2, the appliance shall conform to the following. a) The side-to-side movement of the bottomgrate within its support shall not exceed5mm. b) It shall not be possible to pass a20mm diameter sphere from above the bottomgrate into the ashpi
38、t at any point other than a corner. c) It shall not be possible to pass a30mm diameter sphere from above the bottomgrate into the ashpit at a corner. d) There shall be a clearance of not less than6mm in the plane of the bottomgrate at all points between the bottomgrate and adjacent components. 2.4.4
39、 Appliances with underfloor air supply When assembled as described in2.4.2, the appliance shall conform to the following. a) It shall not be possible to pass a20mm diameter sphere from the bottomgrate into the ashpit at any point other than a corner. b) It shall not be possible to pass a30mm diamete
40、r sphere from above the bottomgrate into the ashpit at a corner. c) There shall be a clearance of not less than3mm in the plane of the bottomgrate surface at all points between the bottomgrate and adjacent components. 2.5 Combustion air control The appliance shall be designed so that, when it is ins
41、talled according to the manufacturers instructions, the primary air shall enter the ashpit only through the designated air inlet(s). NOTE 1The primary air may be fan assisted. If for an overnight burning appliance the hearth forms the base of the ashpit, a means of sealing the firefront to the heart
42、h and to either the fireback or boiler shall be provided and be detailed in the manufacturers instructions. The air control shall be capable of maintaining any position in which it is intended to be set. It shall be capable of adjustment to at least three intermediate positions between the fully clo
43、sed and fully open positions. Two of these positions shall be between the fully closed position and30% of the fully open position, measured in terms of the area of the primary air opening. NOTE 2A further means of fine air control in the nearly closed position should be provided. NOTE 3The design of
44、 the fire should be such that spillage of fuel or ash should not prevent complete closure of the air control. 0 3 0 1 0 1 0 1 0 1 BS3376:1994 BSI 05-1999 5 Table 1 Materials for construction of appliance components Table 2 Minimum dimensions for category b) appliances 2.6 Ashpan An ashpan shall be p
45、rovided, constructed of low carbon steel or stainless steel (see Table 1) of minimum thickness0.91mm. The minimum ashpan capacity shall be not less than the value given in Table 3. The capacity shall be determined geometrically. If the ashpan is open at the rear, an angle of repose for the ash of45
46、shall be assumed at the rear end. The ashpan shall be so designed that the ash collection area X shall be not less than the ash shedding area Z when calculated in accordance withA.4.5. NOTEThe ashpan should be designed and constructed to ensure the following: a) that it locates in the ashpit in such
47、 a way that it allows the free passage of primary air and does not obstruct any primary air control; b) that it can be easily and safely withdrawn, carried and emptied when hot, using the tool(s) provided, without undue spillage of ash (see2.16); c) that it does not distort to an extent that makes i
48、t unsuitable for use. Table 3 Minimum ashpan capacity 2.7 Ashpit and ashpit cover The height from the bottom of the inside of the ashpan to the underside of the bottomgrate bars shall be not less than75mm at any point. NOTEThe ashpit cover should be designed to ensure the following: a) that its clos
49、ure is not easily prevented by spilled undergrate material; b) that it is difficult to accidentally dislodge it from the set position; c) that when hot, it can be handled easily and safely with the tool(s) provided (see2.16). 2.8 Fallplate and front firebars 2.8.1 Fallplate If a fallplate is fitted, the design of the fallplate shall be such that, when in the closed position, it will not open without using the tool(s) provided (see2.16). Component Material Cast iron Low carbon steel Other Ashpit cover w w Cast alu
