UL 296A-2018 UL Standard for Safety Waste Oil-Burning Air-Heating Appliances (Third Edition).pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 296A Waste Oil-Burning Air-Heating Appliances STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATE

2、RIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Waste Oil-Burning Air-Heating Appliances, UL 296A Third Edition, Dated August 2, 2018 Summary of Topics This new edition of ANSI/UL 296A was issued to incorporate editorial updates. No

3、technical changes were made. These revisions are considered to be non-sustantive and not subject to ULs STP process. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recordi

4、ng, 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 liable for any special, incidental, con

5、sequential, 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 of such damage. In no event shall ULs

6、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, liability, damage, claim, or judgment (includi

7、ng reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. AUGUST 2, 2018 UL 296A tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUG

8、UST 2, 2018 UL 296A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 2, 2018 1 UL 296A Standard for Waste Oil-Burning Air-Heating Appliances Previous numbered and unnumbered editions of standards covering heatin

9、g appliances have been published since 1987. First Edition November, 1990 Second Edition October, 1995 Third Edition August 2, 2018 This ANSI/UL Standard for Safety consists of the Third Edition. The most recent designation of ANSI/UL 296A as an American National Standard (ANSI) occurred on August 1

10、, 2013. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title Page. 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 Dev

11、elopment 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 property

12、of UL. COPYRIGHT 2018 UNDERWRITERS LABORATORIES INC. UL/ANSI 296A-2013UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 2, 2018 WASTE OIL-BURNING AIR-HEATING APPLIANCES - UL 296A 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORI

13、ZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS PART I ALL WASTE OIL-BURNING AIR-HEATING APPLIANCES INTRODUCTION 1 Scope .8 2 General 8 3 Glossary .9 4 Components 14 CONSTRUCTION 5 Protection of Users and Service Personnel15 6 Enclosures 19 6.1 General 19 6.2 Doors a

14、nd covers .26 6.3 Field wiring system connections .28 7 Field Wiring .29 7.1 General 29 7.2 Leads and terminals .31 8 Internal Wiring .32 8.1 General 32 8.2 Methods33 8.3 Short circuit protection .36 9 Separation of Circuits 36 10 Grounding and Bonding .38 ELECTRICAL COMPONENTS 11 General41 12 Mount

15、ing of Electrical Components .41 13 Motors and Motor Overload Protection 42 14 Overcurrent Protection of High-Voltage Control-Circuit Conductors46 14.1 General .46 14.2 Direct-connected high-voltage control circuit .46 14.3 Tapped high-voltage control circuits 46 14.4 Overcurrent-protective devices

16、.47 15 Overcurrent Protection of Transformers48 15.1 High-voltage transformers .48 15.2 Low-voltage transformers50 15.3 Overcurrent protective devices .50 16 Switches and Controllers 51 17 Capacitors .52 18 Electrical Insulating Materials.52 SPACINGS 19 High-Voltage Circuits 52 20 Low-Voltage Circui

17、ts 54 AUGUST 2, 2018 WASTE OIL-BURNING AIR-HEATING APPLIANCES - UL 296A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE 21 General54 22 Test Fuels .55 23 Instrumentation .56 23.1 Draft 56 23.2 Fuel input .56 23.3 Power measureme

18、nt56 23.4 Speed measurement .56 23.5 Static pressure .57 23.6 Temperature measurement 59 24 Test Voltage .61 25 Power Input Test .62 26 Temperature Test.62 27 Stalled Fan Motor Test 65 28 Short-Circuit Test .65 29 Overload Test, High-Voltage Transformers.68 30 Burnout Test, High-Voltage Transformers

19、 69 31 Dielectric Voltage-Withstand Test Appliance70 MANUFACTURING AND PRODUCTION TESTS 32 General70 33 Production Line Dielectric Voltage-Withstand Test 71 MARKINGS 34 Nameplate .72 35 Supplementary .75 INSTRUCTIONS 36 General76 PART II BURNERS CONSTRUCTION 37 General77 38 Materials.78 39 Assembly

20、78 40 Accessibility for Servicing 79 41 Fan Housings and Air Tubes .80 42 Combustion Air Controls .80 43 Fuel Strainers 81 44 Fittings, Piping, and Tubing 85 45 Valves.87 46 Gauges88 47 Ignition Systems 88 48 Electric High-Tension Ignition 89 48.1 Assembly .89 48.2 Electrode and bus bars .89 AUGUST

21、2, 2018 WASTE OIL-BURNING AIR-HEATING APPLIANCES - UL 296A 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 48.3 Insulators .89 48.4 Leads .90 48.5 Transformers 90 49 Gas Pilots .91 50 Control Applications .91 51 Primary Safety Controls .92

22、52 Oil Atomization Control 93 53 Interlocks 93 54 Oil Heating Equipment 93 55 Air Atomizing Equipment.93 56 Combination Gas-Oil Burners 94 PERFORMANCE 57 General94 58 Combustion Tests 95 58.1 Mechanical-atomizing burners general 95 58.2 Extended operation .95 59 Combustion Air Failure Test97 60 Inte

23、rruption of Atomization Test.98 61 Undervoltage Operation Test .98 62 Power Interruption Test99 63 Continuous Operation Temperature Test .100 64 Ignition Tests, Multiple Igniters 100 65 Ignition Tests, Electric High-Tension .100 65.1 Reduced voltage cold oil .100 65.2 Combustion detectors .101 66 Ig

24、nition Tests, Gas Pilot 102 66.1 Reduced voltage 102 66.2 Pilot supervision 102 66.3 Flame failure response.103 66.4 Stability 103 67 Ignition Test, Gas-Electric System .103 68 Ignition Tests, Gas-Electric High-Tension System104 68.1 Reduced voltage cold oil .104 68.2 Dielectric voltage-withstand bu

25、rner 104 68.3 Dielectric voltage-withstand electrode insulators .105 69 Ignition Test, Multiple-Atomizer Burner .105 70 Abnormal Operation Test Oil Heating.106 PART III - BOILERS, FURNACES, AND HEATERS CONSTRUCTION 71 Assembly .106 72 Accessibility for Servicing .109 73 Disposal of Combustion Produc

26、ts109 74 Base .109 75 Casing .111 76 Radiation Shields or Liners .112 77 Materials in Air Handling Compartments 112 78 Air Filters .114 AUGUST 2, 2018 WASTE OIL-BURNING AIR-HEATING APPLIANCES - UL 296A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSIO

27、N FROM UL 79 Combustion Chamber 114 80 Radiators .114 81 Heating Surface Joints .115 82Baffles .115 83 Flue Collars .116 84 Dampers and Draft Regulators 116 85 Controls 116 85.1 Application .116 85.2 Limit control 117 85.3 Fan control .118 PERFORMANCE CENTRAL FURNACES 86 General 118 87 Test Installa

28、tion for Standard Clearances .119 87.1 Downow and upow furnaces enclosure 119 87.2 Chimney connector 120 87.3 Air outlet and inlet forced air furnace.123 87.4 Horizontal furnace enclosure .127 87.5 Chimney connector 128 87.6 Air outlet and inlet .128 88 Initial Test Conditions 132 89 Combustion Test

29、 Burner and Furnace 133 90 Operation Tests .133 91 Limit Control Cutout Test .134 92 Continuity of Operation Test 135 93 Airow Test Downow and Horizontal Furnaces .136 94 Temperature Tests General .137 95 Continuous Operation Test .137 96 Restricted Inlet Test138 97 Fan Failure Test .138 98 Blocked

30、Outlet Test 139 PERFORMANCE UNIT HEATERS 99 General 139 100 Test Installation 140 100.1 Floor-mounted heaters140 100.2 Suspended type heaters 144 101 Initial Test Conditions .146 102 Combustion Test Burner and Heater 146 103 Operation Tests 147 104 Limit Control Cutout Test 147 105 Continuity of Ope

31、ration Test .148 106 Temperature Tests General 148 107 Continuous Operation Test 149 108 Restricted Inlet Test 149 109 Fan Failure Test150 PERFORMANCE BOILERS 110 General .150 AUGUST 2, 2018 WASTE OIL-BURNING AIR-HEATING APPLIANCES - UL 296A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPROD

32、UCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PART IV OUTDOOR USE EQUIPMENT CONSTRUCTION 111 General .151 112 Enclosure151 112.1 General .151 112.2 Corrosion protection 152 113 Field-Wiring Connections 154 114 Internal Wiring .154 115 Electrical Insulating Material .154 PERFORMANCE 116 Rain Test

33、 155 117 Wind Test .158 117.1 Wind velocity 40 miles per hour158 117.2 Wind velocity 10 miles per hour159 118 Accelerated Aging Test Gaskets, Adhesives, and Sealing Compounds 159 119 Metallic Coating Thickness Test 160 MARKING 120 General .162 APPENDIX A Standards for ComponentsA1 AUGUST 2, 2018 WAS

34、TE OIL-BURNING AIR-HEATING APPLIANCES - UL 296A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PART I ALL WASTE OIL-BURNING AIR-HEATING APPLIANCES INTRODUCTION 1 Scope 1.1 These requirements cover air-heating appliances of the central furn

35、ace and unit heater types and boiler assemblies intended for burning waste oil fuels and having fuel inputs rated no more than 20 gallons/hour (75.7 liters/hour) or approximately 3,000,000 Btu/hour (3,160,000 kj/hour). 1.2 These requirements cover automatically-lighted, mechanical-atomizing type bur

36、ners that typically are used with these appliances. The burner is to be factory-installed on or provided with each appliance. 1.3 The burners covered by these requirements are equipped with an automatic primary safety control to prevent the abnormal discharge of oil at the burner in the event of ign

37、ition failure or ame failure. 1.4 Requirements for the installation and use of waste oil-burning appliances are included in the Installation of Oil Burning Equipment, ANSI/NFPA 31. Waste oil-burning appliances are for use only in commercial and industrial applications. 1.5 In addition to being inves

38、tigated for use with waste oils, the heating appliances covered by these requirements are investigated for use with a numerical grade of fuel oil, graded according to the Specication for Fuel Oils, ANSI/ASTM D396. 1.6 The terms combustible and noncombustible, as used in these requirements, are dened

39、 in the Glossary of Terms Relating to Chimneys, Vents, and Heat-Producing Appliances, ANSI/NFPA 97M. 2 General 2.1 The term appliance refers to any equipment covered by this standard. The term furnace refers to a central furnace. The term heater refers to a unit heater. 2.2 Values stated without par

40、entheses are the requirement. Values in parentheses are explanatory or approximate information. 2.3 Unless indicated otherwise, all voltage and current values mentioned in this standard are root-mean-square (rms). AUGUST 2, 2018 WASTE OIL-BURNING AIR-HEATING APPLIANCES - UL 296A 8UL COPYRIGHTED MATE

41、RIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Glossary 3.1 For the purpose of this standard, the following denitions apply. 3.2 ACCESSIBLE, READILY Capable of being reached easily and quickly for operation, adjustment, and inspection. 3.3 AIR, PRIMARY The

42、air introduced into a burner and that mixes with the fuel before it reaches the ignition zone. 3.4 AIR, SECONDARY The air externally supplied to the ame at or beyond the point of ignition. 3.5 AIR SHUTTER An adjustable device for varying the size of the air inlet or inlets regulating primary or seco

43、ndary air. 3.6 APPLIANCE, DIRECT VENT SYSTEM A self-contained appliance that is inherently constructed so that: a) All air supplied for combustion; b) The combustion system of the appliance; and c) All products of combustion are completely isolated from the atmosphere of the space in which the appli

44、ance is installed. 3.7 APPLIANCE, VENTED An indirect-red appliance provided with a ue collar to accommodate a ue pipe for transporting ue gases to the outer air. 3.8 BOILER A closed vessel in which water or some other liquid is heated or in which steam is generated or superheated, under pressure or

45、vacuum, by direct application of heat. 3.9 BOILER, HIGH PRESSURE STEAM A boiler in which steam is generated at a pressure higher than 15 psig (103 kPa). 3.10 BOILER, HIGH TEMPERATURE WATER A boiler intended for operation at a pressure exceeding 160 psig (1103 kPa) or at a temperature exceeding 250F

46、(121C) or both. 3.11 BOILER, HOT WATER A boiler that furnishes hot water at a pressure not exceeding 160 psig (1103 kPa) and at a temperature not exceeding 250F (121C). 3.12 BOILER, LOW PRESSURE STEAM A boiler in which steam is generated at a pressure not exceeding 15 psig (103 kPa). 3.13 BURNER, AU

47、TOMATICALLY LIGHTED One in which fuel to the main burner is normally turned on and ignited automatically. AUGUST 2, 2018 WASTE OIL-BURNING AIR-HEATING APPLIANCES - UL 296A 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.14 BURNER, MANUALL

48、Y LIGHTED One in which fuel to the main burner is turned on only by hand and is ignited under supervision. 3.15 BURNER, MECHANICAL-ATOMIZING TYPE A power-operated burner that prepares and delivers the oil and all or part of the air by a mechanical process in controllable quantities for combustion. S

49、ome examples are air atomizing, high and low pressure atomizing, horizontal rotary atomizing, vertical rotary atomizing, and vertical rotary wall-ame burners. 3.16 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. 3.17 BURNER, NATURAL-DRAFT TYPE A burner that depends principally upon the natural draft created in the ue to induce