UL 295-2007 UL Standard for Safety Commercial-Industrial Gas Burners (First Edition Reprint with Revisions Through and Including January 30 2015)《商用工业燃气燃烧器》.pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 295 Commercial-Industrial Gas BurnersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURT

2、HER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Commercial-Industrial Gas Burners, UL 295 First Edition, Dated December 7, 2007 Summary of Topics This revision to ANSI/UL 295 is being issued to incorporate an editorial revision to 39.7. Text that has been chang

3、ed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the changed requirem

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8、 is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. T

9、he prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. JANUARY 30, 2015 UL 295 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISS

10、ION FROM UL JANUARY 30, 2015 UL 295 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 7, 2007 (Title Page Reprinted: January 30, 2015) 1 UL 295 Standard for Commercial-Industrial Gas Burners First Edition Decem

11、ber 7, 2007 This ANSI/UL Standard for Safety consists of the First edition including revisions through January 30, 2015. The most recent designation of ANSI/UL 295 as an American National Standard (ANSI) occurred on July 21, 2014. ANSI approval for a standard does not include the Cover Page, Transmi

12、ttal Pages, Title Page, or effective date information. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards fo

13、r Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC

14、 ANSI/UL 295-2014UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 28, 2013 COMMERCIAL-INDUSTRIAL GAS BURNERS - UL 295 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMI

15、SSION FROM UL CONTENTS INTRODUCTION 1 Scope .6 2 Components 6 3 Units of Measurements .6A 4 Undated References 7 5 Glossary .7 CONSTRUCTION 6 General .10A 7 Corrosion Protection 10B 8 Protection of Users and Service Personnel 10B 9 Enclosures 16 9.1 General 16 9.2 Accessibility of uninsulated live p

16、arts and lm-coated wire - general .20 9.3 Doors and covers .25 9.4 Field wiring system connection 26 9A General Components and Devices 26A CONSTRUCTION ELECTRICAL COMPONENTS 10 Field Wiring 27 10.1 General .27 10.2 Leads and terminals 29 11 Internal Wiring 30 11.1 General .30 11.2 Methods 31 11.3 Sh

17、ort-circuit protection 34 12 Separation of Circuits .34 13 Bonding for Grounding 36 14 Mounting of Electrical Components .39 15 Motors and Motor Overload Protection 40 15A Motors .41 15A.1 General 41 15A.2 Motor Overload Protection 42B 16 Overcurrent Protection of High-Voltage Control-Circuit Conduc

18、tors .43 16.1 General .43 16.2 Direct-connected high-voltage control circuit .43 16.3 Tapped high-voltage control circuits 43 16.4 Overcurrent-protective devices .45 17 Overcurrent Protection of Transformers 46 17.1 High-voltage transformers General 46 17.2 High-voltage transformers Thermal Protecti

19、on 46 17.3 High-voltage transformers overcurrent protection .47 17.4 Low-voltage transformers General 47 17.5 Low-voltage transformers Overcurrent Protective Devices .48 18 Switches and Controllers 48 19 Capacitors .48A 20 Electrical Insulating Materials .48B OCTOBER 28, 2013 COMMERCIAL-INDUSTRIAL G

20、AS BURNERS - UL 295 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION ELECTRICAL SPACINGS 21 High-Voltage Circuits 48B 22 Low-Voltage Circuits 51 CONSTRUCTION CONTROLS AND SAFETY DEVICES 23 Assembly 52 24 Accessibility for Servic

21、ing .54 25 Fan Housings and Air Tubes 54 26 Combustion Air Control .54 27 Fittings, and Piping and Tubing 56 28 Valves and Regulators 58 28.1 Automatic safety shutoff valves General .58 28.2 Manually operated valves .60 28.3 Gas Pressure regulators 60 29 Bleeds and Vents .61 30 Gauges 62 31 Ignition

22、 Systems General 62 32 Electric High-Tension Ignition 63 32.1 Spark igniters 63 32.2 Electrode and bus bars .63 32.3 Insulators .64 32.4 Leads .64 32.5 Transformers 65 33 Gas Pilots .65 34 Control Applications 66 35 Primary Safety Controls .67 36 Purge and Combustion Air Monitoring Controls .68B 37

23、Gas Pressure Controls 71 38 Interlocks 71 39 Combination Gas-Oil Burners 71 PERFORMANCE 40 Test Methods 72 40.1 Firing conditions 72 40.2 Temperature measurements .73 40.3 Test Installation 73 40.4 Test voltage .74 41 Power Input Test .74 42 Combustion Test .74 43 Endurance Test 75 44 Combustion Air

24、 Failure Test 75 45 Undervoltage Test 76 46 Power Interruption Test 76 47 Pilot Supervision Test .77 48 Ignition Test, Gas-Electric High Tension .77 49 Ignition Test, Multiple Burner .78 50 Delayed Ignition Test 78 51 Temperature Test .78A 52 Strain Relief Test .83 53 Fuel Changeover Test Combinatio

25、n Gas-Oil-Fired Burner Assemblies .83 OCTOBER 28, 2013 COMMERCIAL-INDUSTRIAL GAS BURNERS - UL 295 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 54 Short-Circuit Test 83 55 Overload Test, High-Voltage Transformers 86 56 Burnout Test, High-

26、Voltage Transformers .86 57 Dielectric Voltage-Withstand Test .87 57.1 General .87 57.2 Dielectric withstand ignition assembly .88 57.3 Dielectric withstand electrode insulator 88 MANUFACTURING AND PRODUCTION TESTS 58 General .88 59 Production Line Dielectric Voltage-Withstand Test 89 MARKINGS 60 Ge

27、neral 90 61 Nameplate .90 62 Supplemental Marking .91 INSTRUCTIONS 63 General 93 APPENDIX A JUNE 10, 2011 COMMERCIAL-INDUSTRIAL GAS BURNERS - UL 295 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements

28、 cover commercial-industrial gas burners with input ratings over 400,000 Btu per hour (117.23 kW) intended for installation in heating equipment such as, but not limited to, appliances, furnaces, heaters, ovens, water heaters, and incinerators. These gas burners are required to be equipped with inte

29、gral automatic primary safety controls to restrict the abnormal ow of gaseous fuel in case of ignition failure and/or ame failure. 1.2 Additional installation and operation requirements are available for commercial-industrial gas burners, as dened by the National Fuel Gas Code, NFPA 54 and by the Li

30、queed Petroleum Gas Code, NFPA 58, as applicable. 2 Components 2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with the requirements for that component. See the individual sections of this Standard for component requirements. 2.1 revised June 10, 2011 2

31、2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.3 A component shall be used in accordanc

32、e with its rating established for the intended conditions of use. 2.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, an

33、d shall be used only under those specic conditions. JUNE 10, 2011 COMMERCIAL-INDUSTRIAL GAS BURNERS - UL 295 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Units of Measurements 3.1 Values stated without parentheses are the requirement.

34、Values in parentheses are explanatory or approximate information. JUNE 10, 2011 COMMERCIAL-INDUSTRIAL GAS BURNERS - UL 295 6AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 10, 2011 COMMERCIAL-INDUSTRIAL GAS BURNERS - UL 295 6B No Text

35、on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Undated References 4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that c

36、ode or standard. 5 Glossary 5.1 For the purpose of this standard, the following denitions apply. 5.2 AIR SHUTTER An adjustable device for varying the size of the air inlet or inlets regulating primary or secondary air. 5.3 AIR SHUTTER, AUTOMATICALLY OPERATED An air shutter operated by an automatic c

37、ontrol. 5.4 ALUMINUM-COATED STEEL An aluminum coated steel in which the bond between the steel and the aluminum is an iron-aluminum alloy. 5.5 BURNER, GAS A device for the nal conveyance of the gas, or a mixture of gas and air, to the combustion zone. 5.6 BURNER, AUTOMATICALLY LIGHTED One where fuel

38、 to the main burner is normally turned on and ignited automatically. 5.7 BURNER, MANUALLY LIGHTED One where fuel to the main burner is turned on only by hand and ignited under supervision. 5.8 BURNER, MECHANICAL-DRAFT A burner that includes a power-driven fan, blower, or other mechanism as the princ

39、ipal means for supplying air for combustion. 5.9 BURNER, NATURAL-DRAFT A burner that depends principally upon the natural draft created in the ue to induce into the burner the air required for combustion. 5.10 BURNER HEAD That portion of a burner beyond the outlet end of the mixer tube which contain

40、s the ports. 5.11 COMBUSTIBLE AND NON-COMBUSTIBLE Refer to the Standard Glossary of Terms Relating to Chimneys, Vents, and Heat-Producing Appliances, ANSI/NFPA 97. 5.12 COMBUSTIBLE MATERIAL Combustible material as pertaining to materials adjacent to or in contact with heat-producing appliances, chim

41、ney connectors and vent connectors, steam and hot water pipes, refers to material made of or surfaced with wood, compressed paper, plant bers, or other material that will ignite and burn. Such material shall be considered as combustible even through ameproofed, re-retardant treated, or plastered. 5.

42、13 COMBUSTION As used herein, the rapid oxidation of fuel accompanied by the production of heat, or heat and light. Complete combustion of a fuel is possible only in the presence of an adequate supply of oxygen. 5.14 COMBUSTION CHAMBER The portion of an appliance within which combustion occurs. 5.15

43、 COMBUSTION DETECTOR That part of a primary safety control which is responsive directly to ame properties. DECEMBER 7, 2007 COMMERCIAL-INDUSTRIAL GAS BURNERS - UL 295 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.16 COMBUSTION PRODUCTS

44、Constituents resulting from the combustion of a fuel with the oxygen of the air, including the inerts, but excluding excess air. 5.17 CONDENSATE The liquid which separates from a gas, including ue gases, due to a reduction in temperature. 5.18 CONTROL A device designed to regulate the fuel, air, wat

45、er, or electrical supply to the controlled equipment. It may be automatic, semiautomatic, or manual. 5.19 CONTROL, LIMIT An automatic safety control, responsive to changes in liquid level, pressure, or temperature, for limiting the operation of the controlled equipment. 5.20 CONTROL, OPERATING A con

46、trol other than a safety control or interlock, to start or regulate burner ring according to load demand and to stop or regulate re on satisfaction of demand or upon reaching normal temperature or pressure in the device being red. Operating controls may also actuate auxiliary equipment. 5.21 CONTROL

47、 PRIMARY SAFETY An automatic control that monitors the operation of a gas-red or an oil-red burner. It normally consists of the following sections that may be integrated into a common unit or may be separate units, interconnected by wiring: a) A device that programs the burner through start-up and

48、shutdown operations in response to signals from regulating, limiting, and monitoring devices. It also provides the necessary timings, in proper sequence, for purging, pilot ame ignition, main ame ignition, and in case of ignition or ame failure, for safety shutdown (lockout). b) A device that is res

49、ponsive to ame properties. It monitors the ame at the point of ame supervision and transmits a signal to the programming unit, indicating absence or presence of ame. 5.22 CONTROL, SAFETY Automatic controls, including relays, switches, and other auxiliary equipment used in conjunction therewith to form a safety control system, that is intended to reduce the risk of re, electric shock, or injury to persons during operation of the control