UL 296-2017 UL Standard for Safety Oil Burners (Eleventh Edition Reprint with Revisions Through and Including November 29 2017).pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 296 Oil Burners STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHE

2、R REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Oil Burners, UL 296 Eleventh Edition, Dated February 24, 2017 Summary of Topics This new edition of ANSI/UL 296 is being issued to revise requirements for programming and timing of burners. Editorial changes have al

3、so been incorporated. The revised requirements are substantially in accordance with Proposal(s) on this subject dated August 26, 2016 and December 9, 2016. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, elect

4、ronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be

5、liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility

6、 of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liabili

7、ty, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. FEBRUARY 24, 2017 UL 296 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DI

8、STRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 24, 2017 UL 296 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 24, 2017 1 UL 296 Standard for Oil Burners First Edition May, 1927 Second Edition January, 1934 T

9、hird Edition December, 1955 Fourth Edition May, 1959 Fifth Edition April, 1973 Sixth Edition September, 1974 Seventh Edition August, 1980 Eighth Edition February, 1989 Ninth Edition June, 1994 Tenth Edition September, 2003 Eleventh Edition February 24, 2017 This ANSI/UL Standard for Safety consists

10、of the Eleventh edition. The most recent designation of ANSI/UL 296 as an American National Standard (ANSI) occurred on February 24, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title Page. The Department of Defense (DoD) has adopted UL 296 on January 27

11、, 1992. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. 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 Stand

12、ards Development System (CSDS) at https:/. ULs Standards for 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 p

13、roperty of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 296-2017UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 24, 2017 OIL BURNERS - UL 296 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPR

14、ODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .6 2 Components6 3 Units of Measurement .6 4 Undated References 7 5 Glossary .7 CONSTRUCTION MECHANICAL 6 General.11 7 Servicing11 8 Assembly .12 9 Bases 15 10 Fan Housings and Air Tubes .15 11 Fire Pots and Vaporizers

15、 15 12 Combustion Air Controls .16 13 Prepurge and Post-Purge 17 14 Draft Regulators 18 15 Strainers.18 16 Constant-Level Devices .23 17 Floats .23 18 Fittings, and Piping and Tubing.23 19 Valves.26 20 Stuffing Boxes 27 21 Gauges28 22 Gas Pilots .28 23 Manually-Lighted Burners 28 24 Antiooding Devic

16、es 29 CONSTRUCTION ELECTRICAL 25 Servicing and Adjustment 30 26 Ignition Systems 31 27 Electric High-Tension Ignition 32 27.1 Assembly .32 27.2 Electrode and bus bars .32 27.3 Insulators .33 27.4 Leads .33 27.5 Transformers 34 28 Electric Hot-Wire Ignition 34 29 Control Applications .34 30 Primary S

17、afety Controls .35 31 General Components and Devices 37 32 Field Wiring 38 32.1 General .38 32.2 Leads and terminals 41 33 Internal Wiring43 33.1 General .43 33.2 Methods 43 FEBRUARY 24, 2017 OIL BURNERS - UL 296 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOU

18、T PERMISSION FROM UL 33.3 Short circuit protection 46 34 Overcurrent Protection of High-Voltage Control-Circuit Conductors46 34.1 General .46 34.2 Direct-connected high-voltage control circuit .47 34.3 Tapped high-voltage control circuits 47 34.4 Overcurrent-protective devices .48 35 Overcurrent Pro

19、tection of Transformers49 35.1 High-voltage transformers .49 35.2 Thermal protection .49 35.3 Overcurrent protection 50 35.4 Low-voltage transformers50 35.5 Overcurrent protective devices .51 36 Separation of Circuits .51 37 Accessibility 53 38 Bonding for Grounding 55 39 Mounting of Electrical Comp

20、onents .58 40 Electrical Enclosures 59 40.1 General .59 40.2 Burners having a minimum input in excess of 3 gph (11.4 L/h).62 40.3 Burners having a minimum input 3 gph (11.4 L/h) or less .64 40.4 Doors and covers 67 40.5 Field-wiring system connections69 41 Motors and Motor Overload Protection 70 42

21、Switches and Controllers 74 43 Capacitors .75 44 Electrical Insulating Material75 45 Spacings High-Voltage Circuits .76 46 Spacings Low-Voltage Circuits77 47 Combination Gas-Oil Burners 78 PERFORMANCE 48 General78 49 Measurements .79 50 Test Voltage .80 51 Combustion Tests 80 51.1 General .80 51.2 M

22、echanical-atomizing burners test no. 1 .81 51.3 Vaporizing burners test no. 2 82 52 Combustion Air Failure Test Test No. 384 53 Interruption of Atomization Test Test No. 4.85 54 Undervoltage Test Test No. 5 85 55 Power Interruption Test Test No. 6 86 56 Temperature Test Test No. 7 .87 57 Ignition Te

23、sts, Multiple Igniters .87 58 Ignition Tests, Electric High-Tension 87 58.1 Reduced voltage cold oil test no. 8 .87 58.2 Combustion detectors test no. 9 91 59 Ignition Test, Electric Hot-Wire .91 59.1 Reduced voltage test no. 10 .91 59.2 Reduced voltage test no. 11 .92 59.3 Endurance test no. 12 92

24、59.4 Component temperatures test no. 13 .93 FEBRUARY 24, 2017 OIL BURNERS - UL 296 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 60 Ignition Tests, Gas 93 60.1 Reduced voltage test no. 14 .93 60.2 Pilot supervision test no. 1594 60.3 Flam

25、e failure response test no. 1694 60.4 Stability test no. 17 .95 61 Ignition Test, Gas-Electric Test No. 18.95 62 Ignition Test, Gas-Electric High-Tension .95 62.1 Reduced voltage cold oil test no. 19 95 63 Ignition Tests, Gas-Electric Hot-Wire 96 63.1 Reduced voltage test no. 20 .96 63.2 Reduced vol

26、tage cold oil test no. 21 97 64 Ignition Tests, Manual .97 64.1 Time for ignition test no. 22 97 64.2 Stability of ignition test no. 23 98 64.3 Ignition ash test no. 24 .98 64.4 Reduced voltage (electric or gas-electric) test no. 25 .99 65 Ignition Test, Multiple-Atomizer Burner Test No. 26 100 66 I

27、gnition Tests, Multiple-Vaporizer Burner Test No. 27.101 67 Return of Ignition Test No. 28 .101 68 Seepage and Burnoff Test Test No. 29 .102 69 Dielectric Voltage-Withstand Test Test No. 30 .102 70 Short Circuit Test Test No. 31 .103 71 Overload Test, High-Voltage Transformers106 72 Burnout Test, Hi

28、gh-Voltage Transformers.106 MANUFACTURING AND PRODUCTION TESTS 73 General 107 MARKING 74 General 108 75 Instructions .111 FEBRUARY 24, 2017 OIL BURNERS - UL 296 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These

29、requirements cover oil burners intended for ring appliances and devices such as boilers; central, oor, wall, and special furnaces; storage tank water, air, and direct-red air heater units; and ovens. These burners are required to be equipped with automatic primary safety controls to restrict abnorma

30、l discharge of oil at the burner in case of ignition failure or ame failure. 1.2 Requirements for the installation and use of oil-burning equipment are included in the National Fire Protection Association Standard for the Installation of Oil-Burning Equipment, NFPA 31. These heaters are intended for

31、 installation in accordance with codes such as the BOCA National Mechanical Code, the Standard Mechanical Code, and the Uniform Mechanical Code. 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 t

32、he individual sections of this Standard for component requirements. 2.2 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 req

33、uirement in this standard. 2.3 A component shall be used in accordance 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 cond

34、itions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. FEBRUARY 24, 2017 OIL BURNERS -

35、 UL 296 6UL 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 code

36、 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 ANTIFLOODING DEVICE A primary safety control that causes the fuel ow to be shut

37、off upon a rise in fuel level or upon receiving excess fuel, and that operates before the hazardous discharge of fuel can occur. 5.4 BURNER, AUTOMATICALLY-LIGHTED One where fuel to the main burner is turned on and ignited automatically. 5.5 BURNER, MANUALLY-LIGHTED One where fuel to the main burner

38、is turned on only by hand and ignited under supervision. 5.6 BURNER, MECHANICAL-ATOMIZING TYPE A power-operated burner that prepares and delivers the oil and all or part of the air by mechanical process in controllable quantities for combustion. Some examples are air and steam atomizing, high and lo

39、w pressure atomizing, horizontal rotary, vertical rotary atomizing, and vertical rotary wall-ame burners. 5.7 BURNER, MECHANICAL-DRAFT TYPE A burner that includes a power-driven fan, blower, or other mechanism as the principal means for supplying air for combustion. 5.8 BURNER, NATURAL-DRAFT TYPE A

40、burner that depends principally upon the natural draft created in the ue to induce into the burner the air required for combustion. 5.9 BURNER, VAPORIZING TYPE A burner consisting of an oil-vaporizing bowl or other receptacle to which liquid fuel may be fed in controllable quantities; the heat of co

41、mbustion being used to vaporize the fuel, with provision for admitting air and mixing it with the oil vapor in combustible proportions. 5.10 CENTRAL HEATING APPLIANCE A stationary indirect-red vented appliance comprising the following classes: boilers, central furnaces, oor furnaces, and recessed he

42、aters. A oor-mounted unit heater to be connected to a duct system is classied also as a central heating appliance. 5.11 CONSTANT-LEVEL VALVE A device for maintaining within a reservoir a constant level of fuel for delivery to the burner. 5.12 CONTROL A device that functions to regulate the fuel, air

43、, water, or electrical supply to the controlled equipment. It may be automatic, semiautomatic, or manual. 5.13 CONTROL, LIMIT A safety control responsive to changes in liquid level, pressure, or temperature, normally set beyond the intended operating range of the controlled equipment to limit its op

44、eration. FEBRUARY 24, 2017 OIL BURNERS - UL 296 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.14 CONTROL, OPERATING A control, other than a safety control or interlock, to start or regulate input according to demand, and to stop or regu

45、late input on satisfaction of demand. Operating controls may also actuate auxiliary equipment. 5.15 CONTROL, SAFETY An automatic control, such as a relay or switch used in conjunction with other auxiliary equipment to form a safety control system that is relied upon to reduce the risk of re, electri

46、c shock, or injury to persons. 5.16 CONTROL, 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: Programming Uni

47、t A device that programs the burner through start-up and shut-down operations in response to signals from regulating, limiting, and monitoring devices. It also provides the timings, as required, in proper sequence, for purging, ame establishing periods, and in case of ame failure, for safety shutdow

48、n (lockout). Combustion Detector A device that is responsive 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. 5.17 CONTROL, SAFETY COMBUSTION See Control, Primary Safety 5.16. 5.18 DRAFT REGU

49、LATOR, BAROMETRIC (Automatic Damper) A device that functions to maintain a desired draft in the appliance by automatically reducing excess chimney draft to the desired value. 5.19 ELECTRICAL CIRCUITS a) High-Voltage Circuit A circuit involving a potential of not more than 600 volts and having circuit characteristics in excess of those of a low-voltage circuit. b) Low-Voltage Cir