1、CGA 3.2-1976 IndustriaZ and Commercial Gas-Fired Package Furnaces (Reaf f i r med 2003) September 1992 CGA-3.2-1976 ir ERRATA #I to CGA9.2-1976 INDUSTRIAL AND COMMERCIAL (formerly CSA 8203.2) GAS-FIRED PACKAGE FURNACES This errata contains printing corrections to National Standard of Canada CGA- 3.2
2、-1976, Industrial and Commercial Gas-Fired Package Furnaces (formerly CSA B203.2). This Standard was published in May 1976. The page(s1 of this errata are dated September 1992 and numbered: 23A and 24A to replace page(s) 23 and 24 and the CONTENTS page is dated September, 1992 to show this addition.
3、 NOTE : New and amended clauses are identified by a vertical line (“redline“) in the left margin. The page(s) are to be inserted into your copy of the Standard. t PUBUSHED BY Canadian Standards Association 5060 Spectrum Way, Suite 100 Mississauga, Ontario, Canada L4W 5N6 Copyright 0 Canadian Standar
4、ds Association - September 1992 Reprinted: 1 September. 1992 CONTENTS LIST OF I.G.A.C. MEMBERS . LIST OF COMMITTEE MEMBERS . INTRODUCTION . STANDARDS OF REFERENCE I ERRATA #1 . STANDARD SECTION 1 SCOPE . SECTION 2 CONSTRUCTION REQUIREMENTS AND VALVE TRAIN DIAGRAMS . . 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8
5、 2.9 2.10 2.11 2.12 2.13 2.14 2.15 SECTION 3 General Marking MainBurner Flame Safeguards . Pilots Piping and Fittings Air Control Mechanical Draft . Valve Trains for Low Pressure Gas . Valve Trains for Medium Pressure Gas . Valve Trains for High Pressure Gas Test Openings . Safety Controls Electrica
6、l Equipment and Wiring Draft Hoods PERFORMANCE 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 General Combustion Automatic Pilots and Pilots Furnace Safety Limiting Devices Temperatures . Combustion Safety Controls Other Safety Controls . Operating Controls Manifold and Control Assembly Capacity . . Elect
7、rical Tests . SECTION 4 INSTRUCTIONS . 4.1 4.2 Operating Instructions Installation and Service Instructions . PAGE iii. iv v. vi. vii viii viii ix 1 2 4 6 6 7 8 9 10 12 12 16 16 17 17 18 19 20 20 21 22 23A 24A 25 25 26 26 26 27 27 28 i 3.3.5 I flame sensing device does not sense a flame. The gas sup
8、ply to the pilot shall then be increased sufficiently only for the pilot flame sensing device to sense the pilot flame. pilot shall effectively ignite the gas within 2 s from the time gas is admitted to the main burner(s) . At this pilot input, the Temperatures of automatic ignition and safety shut-
9、off devices shall not exceed those shown in Table I, Column 1, Appendix B. METHOD OF TEST Thermocouples shall be peened into or brazed to the parts of these devices wherever over-heating may be anticipated. The main burner(s1 and pilot burner(s) shall be operated at normal test pressure until equili
10、brium pilot temperatures have been attained. Temperatures attained at the points listed above shall be recorded and shall not be in excess of those shown in Table I, Column 1, Appendix B, when tested in accordance with Section 3.2. 3.4 Furnace Safety Limiting Devices 3.4.1 The safety limit control w
11、hen adjusted to a maximum setting and minimum differential, shall function to shut off the gas at the maximum air outlet temperature specified by the manufacturer but in any event not in excess of 250F. METHOD OF TEST The furnace shall be fired at rated input with the limit control set at its maximu
12、m temperature setting. established by gradually restricting the circulating air flow until the limit control operates to shut off or reduce the fire. The outlet air temperature shall be 3.4.2 Continuous Operation All units intended for heating purposes shall be capable of continuous operation of max
13、imum normal input without the safety limit control or controls functioning either completely or intermittently to shut off or reduce the fuel input; METHOD OF TEST The furnace shall be fired at rated input and the circulating air flow adjusted to maintain an outlet air temperature 90F (plus or minus
14、 10F) above inlet air temperature. The fan switch, if used, and the limit control shall be operative and each adjusted to the maximum setting and the minimum differential. The limit control shall allow continuous firing of the furnace under the above condition. After equilibrium temperatures are att
15、ained, gradually restrict the cold-air return or filter. The limit control shall function when or before the outlet air temperature reaches the maximum allowed as deter- mined in 3.4.1. If, after the limit control functions, the outlet air temperature exceeds 110 percent of the maximum allowable, th
16、en permit furnace to cycle on limit control until equilibrium or continuously receding temperatures are attained. exceed the limits given in Table I, Column 2, during the first five cycles nor the limits given in Column 1 for succeeding cycles. The maximum temperatures shall not 23A Copyright 0 Cana
17、dian Standards Association - September 1992 3.5 Overatins Temperatures 3.5.1 3.5.2 3.5.3 3.5.4 3.5.5 The temperatures attained by components shall not exceed the values given in Column 1, Table I, Appendix B, when the furnace is operated continuously at rated input. For purposes of this test tempera
18、tures attained will be corrected to an ambient of 77OF. bfETHOD OF TEST The furnace shall be fired as specified in Section 3.2 with the operating control by-passed and the limit control set at the value established by 3.4.1. The furnace shall be operated until maximum temperatures are obtained. The
19、temperature of the components shall not exceed those given in Column 1, Table I, Appendix B. The temperatures attained by combustible construction adjacent to the furnace shall not exceed the temperatures shown in Column 1, Table I, Appendix B. correct to an ambient of 77F. For purposes of this test
20、 temperatures attained will be MZTHOD OF TEST The furnace shall be installed in an enclosure at the clearances specified by the manufacturer. If none are specified, standard clearances of 6 inches above, sides, rear and vent and 18 inches in front shall be used. The furnace will be operated as in 3.
21、5.1. The temperature shall not exceed those given in Column 1, Table I, Appendix B. Blower Failure (Forced Air Units only). described in 3.4.1 fire furnace at rated input until equilibrium temperatures are attained. Then open the electric circuit to fan motor only. equilibrium or receding temperatur
22、es are attained. The maximum temperatures shall not exceed the limits given in Table I, Column 2, Appendix B, during the first five cycles effected by operation of the limit control nor the limits given in Column 1 for succeeding cycles. With the furnace prepared for operation as Continue test, allo
23、wing furnace to cycle on limit control until Blocked Outlet Fire the furnace prepared as for 3.5.3 but with all electrical circuits in order, until equilibrium temperatures are attained. Then close warm-air outlets and allow furnace to cycle on limit control until equilibrium or receding temperature
24、s are attained. temperature shall not exceed the limits given in Table I, Column 2, Appendix B, during the first five cycles effected by operation of the limit control nor the limits given in Column 1 for succeeding cycles. The maximum Blocked Outlet $ Ontario J. F. Zinn Electronics Corp. of America
25、 (Canada) 520 Kipling Avenue South TORONTO, Ontario M8Z 5E5 C. S. Arnold F. R. Skilton (Secretary) The Canadian Gas Association 55 Scarsdale Road DON MILLS, Ontario M3B 2R3 vii INTRODUCTION The gas industry in Canada is now rapidly expanding and the acceptance and increased future use of natural and
26、 liquefied petroleum gases conrmercially and industrially will be largely dependent on the safe and efficient Fethods of application and utilization. These requirements represent fundamental standards of safety based in part on U.L.C. 795, Standard for Commercial-Industrial Gas-Heating Equipment, an
27、d on past experience of the gas industry. STANDARDS OF REFERENCE CGA B .33-1-1960 CGA 3149.1 CGA B149.2 CSA C.22.2 No.3 CGA 3.0 Established List of Bolts, Cap Screws, Set Screws, Studs and Nuts. Installation Code Cor Natural Gas Burning Appliances and Equipment, Installation Code for Propane Burning
28、 Appliances and Equipment. Electrical Features of Fuel Burning Equipment. Definitions and General Field Recommendations viii SECTION I SCOPE - 1.1 1.2 1 a3 01 a4 These requirements apply to natural and liquefied petroleum gas- fired packaged furnaces designed and manufactured primarily for the purpo
29、se of building heating. These requirements apply to a package furnace having a manufacturers maximum input rating within the range of over 400,000 BTUH and up to and hcluding 10,000,000 BTUH. furnaces series extending beyond lO,QO,OOO BTUH input may be investigated according to the lntent of these r
30、equirements. Package These requirements apply to a package furnace provided with automatic control devices and designed for automatic, semi- automatic or manual operation, A furnace which complies with these requirements shall not be acceptable if it has features which impair the results con- templa
31、ted by the requirements. 1 2.9.8 2.9,7 2.9.6 2.12.4 Note: - SECTION 2 CONSTRUCTION REQUIBEMENTS 2.12.5 2.11.2 I 1 2.6.9 or 1 2.6.10 FIGURE 1. TYPICAL GAS VALVlNG ARRANGEMENT FOR SINGLE BWR Refer to indicated sections for requirements or individual items. 2 2.12.5 1 2.9.5 2.6.10 2.9.1 - - - - - 2.12.
32、2 2.9.3 2.9.2 2.12.1 2.12.4 FIGURE 2 TYPICAL GAS VUVING ARRANGEmNT FOR MULTIPLE BURNERS Note: Refer to indicated sections for requirements for individual items. - 3 2.1 General 2.1.1 2.1.2 2,k06 2.1.7 Each furnace shall be newly produced and shall be constructed entirely of new, unused parts and mat
33、erials. Equipment shall be constructed of materials suitable for the purpose and of sufficient strength and durability to insure safe and reliable service of the parts and the assembly for an extended period of service. Aluminum, where used, shall not attain a temperature in excess of that shown in
34、Table I: (Appendix B). Each unit shall include a11 the essential components necessary for fts normal function when installed as intended. It may be furnished as two separate components, one component consisting of the burner assembly and the other consisting of the furnace assembly. The burner assem
35、hly shall include the flame safeguard control. The furnace assembly shall include all the other parts constituting the complete gas-fired unit and may be in one or more component assemblies. (See also clause 2.1.7)m The various parts of the unit shall be constructed and assembled in accordance with
36、this outline in a manner to insure strength, rigidity, and durability. The equipment shall be assembled completely and tested by the manu- facturer before shipment from the factory. The unit, if not assembled by the manufacturer, shall be arranged in as few subassemblies as practicable, Each shall b
37、e capable of being incor- porated readily into the final assembly without requiring alteration, cutting, drilling, threading, welding, or similar tasks by the installer7 In the case of two or more subassemblies FALich must bear a definite relationship to each other for the proper and safe operation
38、of the equipment, they shall be arranged and constructed to allow and facilit or such subassembliez shall be assembled, tested, and shipped from the factory as one element. Each unit shall affard convenient operation, Secondary radiation surfaces shall be readily cleanable without major dismantling
39、of the equipment, Note: The phrase “major dismantling“ does not prohibit removal of the flue pipe, the furnace panels, the burner or those components which are specifically designed tu permit ready removal and replacement. Provision shall be made to permit ready observation of all flames under 811 n
40、ormal firing conditions. Sufficient and reasonable accessibility shall be afforded to all burnersg eonsrols, and safety devices reqciring normal servicing, Combustion chambers and primary heating surfaces shall be co-structed of Cast Iron, Sheet SeeeP or other suitable material. The temperature of t
41、he metal shall not exceed those listed in Table I Appendix 3 when the furnace is operated under the conditions as described in the tests in these requrements, Plain sheet, low carbon steel, if used, shall not be Less than 12 MSG in thickness. 4 2 .I a4 2.1 .I5 2,1,16 2,1,17 2,1.18 2.1.19 2,1020 2.f,
42、22 2,1,24 2,1.25 Combustion chambers shall be Constructed to. allow accessiblity for necessary servicing and cleaning operations within the chamber, Pro- vision shall be made to permit ready observation of all flames under operating conditions. Refractory material, where used, shall be adequately he
43、ld in place and accessible for replacement. The temperatures of secondary radiation surfaces shall not exceed those listed in Table I, Appendix B. Flue collars shall be made of material not lighter than the surface to which they are attached and shall. extend through the casing externally a sufficie
44、nt distance to permit secure attachment Qf the flue connectorsp Joints in heating surfaces shall be continuously welded, brazed, machined and bolted, threaded, or of rigid flanged construction tightly bolted together enclosing gaskets. 2 The construction of furnaces for space heating shall not allow
45、 the products of combustion to become mixed with the varm air discharged from the furnace. Fuel piping and/or fuel-handling components shall not be located within circulating-air channels. The outer casing or jacket shall be made of steel or other suitable material, reinforced if necessary so that i
46、t is not likely to be damaged through handling in shipment, installation and use. Sheet steel casing shall not be less than No, 22 MSG in thickness, and all surfaces shall be protected against corrosion. The finish shall be protected adequately against damage by heat under normal operating condition
47、s, Casing liners or baffles, if made of sheet metal, shall be not less than No. 22 MSG sheet steel. They shall be attached in a secure manner to insure proper spacing and shall be protected against corrosion by a finish that will not be damaged by heat from the furnace. Air filters, where used shall
48、 be of such size that the average velocity through any filter is not greater than 300 feet per minute unless a higher velocity is specified by the filter manufacturer. Filter area shall be based on nominal external dimensions. Baffles in flue gas passages shall be constructed and located in a manner
49、 to provide for reasonable life and shall be fixed securely in position. Extensions rom furnace openhgs, as those for secondary air supply, doors, etc, shall reach through casings enclosing circulating air a sufficient distance to permit secure fastening of outside frames, and shall be constructed to prevent possible leakage of combustion products into warm air channels. Access openings to return-air compartments shall be completely covered, unless provision is made?or the cover to close by gravity or spring tension, or to cause the furnace to become inoperative in the event
