1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 307B Gas-Burning Heating Appliances for Manufactured Homes and Recreational VehiclesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL
2、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Gas-Burning Heating Appliances for Manufactured Homes and Recreational Vehicles, UL 307B Fifth Edition, Dated October 31, 2006 Summary of Topics This revision to UL 3
3、07B is being issued to remove the reference to the withdrawal date of UL 873 and to address universal upkeep of UL Standards for Safety. These revisions are considered to be non-substantive and not subject to ULs STP process. Text that has been changed in any manner or impacted by ULs electronic pub
4、lishing 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 requirement becomes effective. All rights reserved. No par
5、t of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, 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, incl
6、uding 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, 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
7、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 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
8、ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchase
9、rs 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. The prior text for requirements that have been revi
10、sed and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. SEPTEMBER 17, 2013 UL 307B tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 17, 2013 UL 307B tr2 No T
11、ext on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 31, 2006 (Title Page Reprinted: September 17, 2013) 1 UL 307B Standard for Gas-Burning Heating Appliances For Manufactured Homes and Recreational Vehicles The First edit
12、ion was titled Gas- and Oil-Fired Heating Appliances for Trailer Coaches and numbered UL 307. The Second edition was titled Gas-Heating Appliances for Mobile Homes and Travel Trailers. The Third Edition was titled Gas-Burning Heating Appliances for Mobile Homes and Recreational Vehicles. First Editi
13、on May, 1958 Second Edition October, 1965 Third Edition February, 1982 Fourth Edition January, 1995 Fifth Edition October 31, 2006 This UL Standard for Safety consists of the Fifth Edition including revisions through September 17, 2013. Comments or proposals for revisions on any part of the Standard
14、 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 for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All
15、of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2013 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 31
16、, 2006 UL 307B 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .9 2 General 9 2.1 Components .9 2.2 Units of measurement 10 2.3 Terminology 10 3 Glossary 10 CONSTRUCTION GENERAL 4 Assembly
17、.16 5 Accessibility for Servicing .20 6 Air-Intake Assemblies 21 7 Base .22 7.1 General 22 7.2 Warm air appliances .23 8 Casing 23 9 Radiation Shields 24 10 Combustion Chamber .24 11 Radiator .24 12 Heating-Surface Joints 24 13 Baffles.25 13.1 General .25 13.2 Water heaters .26 14 Flue Collar .26 15
18、 Flue-Gas Outlet Assembly .26 16 Draft Hoods 27 17 Warm Air Appliance Air Handling System 28 18 Warm Air Handling System for Installation Downstream From a Cooling System .28 19 Materials In Air Handling Compartments of Warm Air Appliance 29 19.1 General .29 19.2 Air lters 30 20 Water Heater Storage
19、 Vessels .30 21 Water Heater Dip Tubes .31 BURNER EQUIPMENT AND CONTROLS 22 General 31 23 Gas Piping, Tubing, And Fittings 32 24 Main Burner and Flame Spreaders 33 25 Combustion Air Supply and Control .34 25.1 General .34 25.2 Air shutters 35 25.3 Combustion air dampers 35 26 Orice Spuds and Orice F
20、ittings .35 27 Manual Valves .36 28 Gas Appliance Pressure Regulators .36 OCTOBER 31, 2006 UL 307B 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 29 Gas Bleeds and Vents 37 30 Pilot Gas Filters 38 31 Control Circuits .38 32 Controls .38 32
21、.1 General .38 32.2 Warm air appliance limit control 39 32.3 Warm air appliance fan control .39 32.4 Boiler limit control 40 32.5 Water heater limit control 40 32.6 Water heater temperature regulating control .41 33 Automatic Gas Valves .41 34 Automatic Gas Ignition Systems 42 WIRING METHODS 35 Fiel
22、d Wiring 43 35.1 General .43 35.2 Grounding .46 35.3 Cord-connected appliances 47 36 Factory Wiring 48 37 Electrical Systems Rated 12 Volt DC 52 38 Separation of Circuits .52 39 Bonding for Grounding 54 ELECTRICAL COMPONENTS 40 General 56 41 Electrical Enclosures 57 41.1 General .57 41.2 Doors and c
23、overs 63 41.3 Field wiring system connections 64 42 Motors and Motor Overload Protection 65 43 Capacitors .69 44 Electrical Insulating Material 69 45 Switches and Controllers 70 SPACINGS 46 High-Voltage Circuits 70 47 Low-Voltage Circuits 72 PROTECTION OF USERS AND SERVICE PERSONNEL 48 General 72 PE
24、RFORMANCE GENERAL 49 General 76 50 Instrumentation .76 50.1 Draft measurement .76 50.2 Fuel input measurement 76 OCTOBER 31, 2006 UL 307B 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 50.3 Power measurement 76 50.4 Speed measurement .77 5
25、0.5 Static pressure measurement 77 50.6 Temperature measurement 79 50.7 Warm air appliances 80 50.8 Boilers 82 50.9 Water heater 82 DUCT-CONNECTED APPLIANCE TEST INSTALLATION 51 General 82 52 Corner Installation For Central Furnaces .85 53 Alcove or Closet Installation for Appliance Furnaces 89 54 W
26、all Furnace Installation .94 55 Recessed Furnace Installation 94 BOILER AND WATER HEATER TEST INSTALLATION 56 General 94 FLUE-GAS OUTLET ASSEMBLY 57 General 95 INITIAL TEST CONDITIONS, TEST PRESSURES, AND BURNER ADJUSTMENTS 58 Initial Test Conditions .96 58.1 General .96 58.2 Warm air appliance .96
27、59 Test Pressures and Burner Adjustments .97 APPLIANCE TESTS 60 Combustion Burner and Appliance 98 61 Burner Operating Characteristics 100 61.1 Flash back .100 61.2 Back pressure 101 61.3 Flame extinguishment-water heaters .102 62 Pilot Operating Characteristics 102 62.1 Ignition .102 62.2 Flame tra
28、vel 103 62.3 Protection from drafts 103 62.4 Carbon deposits 104 62.5 Automatic relight pilot system .104 63 Operation of Pilot Actuated Safety Shutoff Devices 105 63.1 Pilot ame establishing period 105 63.2 Shutoff time 105 63.3 Nonautomatic shutoff 106 64 Direct Ignition Tests 106 64.1 General 106
29、 64.2 Ignition time 107 64.3 Flame failure .107 64.4 Venting 108 OCTOBER 31, 2006 UL 307B 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 65 Temperature Test 108 66 Wind Test 111 66.1 General 111 66.2 Main burners .112 66.3 Carbon monoxide
30、.112 66.4 Operating characteristics .113 66.5 Carbon dioxide .113 66.6 Water heater tests 113 67 Direct Vent System Leakage Test .114 68 Field Wiring Strain Relief Test .115 69 Short-Circuit Test 116 69.1 Test no. 1 116 69.2 Test no. 2 117 69.3 Motor circuits .118 70 Dielectric Voltage-Withstand Tes
31、t 118 WARM AIR APPLIANCE TESTS 71 Limit-Control Cutout Test .119 72 Continuity of Operation Test 120 73 Continuous Operation Temperature Test .121 74 Blocked Register Temperature Test 122 75 Blocked Outlet Temperature Test 123 76 Blocked Inlet Temperature Test .123 77 Fan Failure Temperature Test .1
32、24 78 Stalled Fan Motor Temperature Test .124 79 Heating Element Endurance Test 125 80 Horizontal Central Furnace Air Flow Test .127 81 Condensate Test 127 82 Surface Temperature Test 128 83 Ignition of Flammable Fabric and Related Hazards Test 128 BOILER TESTS 84 Limit Control Cutout Test .130 85 L
33、ow Water Level Control Cutout Test 130 86 Continuous Operation Temperature Test .130 WATER HEATER TESTS 87 Water Temperature Control Test 131 88 Thermostat Control Test 131 89 Limit-Control Cutout Test .132 90 Continuous Operation Temperature Test .132 91 Burner Durability Test 132 92 Blocked Flue T
34、est .133 93 Draft Hoods .133 93.1 Blocked draft hood 133 93.2 Downdraft I .134 93.3 Downdraft II 134 93.4 Static load 135 93.5 Flue gases I 135 93.6 Flue gases II 135 OCTOBER 31, 2006 UL 307B 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL
35、93.7 Smoke leakage .136 94 Vent System Leakage Test .136 95 Nonmetallic Dip Tube Tests .136 95.1 Deformation and weight loss 136 95.2 Resistance to crushing .137 95.3 Collapse .139 96 Hydrostatic Pressure Test 140 97 Strain-Relief Test 140 98 Leakage-Current Test 141 MANUFACTURING AND PRODUCTION TES
36、TS 99 General 143 100 Production-Line Grounding Continuity Test 144 MARKING AND INSTRUCTIONS 101 General .144 102 Warm Air Appliance .153 103 Water Heater 153 104 Instructions 157 104.1 All appliances .157 104.2 Instructions for central furnaces 160 104.3 Instructions for water heaters 160 OUTDOOR U
37、SE EQUIPMENT CONSTRUCTION 105 General .160 106 Enclosure 161 106.1 General .161 106.2 Corrosion protection 161 107 Field-Wiring Connections 164 108 Wiring .164 109 Electrical Insulating Materials 165 PERFORMANCE 110 Rain Test 165 110.1 General .165 110.2 Vents .169 111 Gaskets .169 112 Metallic Coat
38、ing Thickness Test 171 MARKING 113 General .172 APPENDIX A Standards for ComponentsA1 OCTOBER 31, 2006 UL 307B 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APPENDIX B OCTOBER 31, 2006 UL 307B 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR F
39、URTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements apply to the following gas fuel-burning heating appliances: a) Direct-vent system appliances for manufactured homes and recreational vehicles; and b) Vented appliances for manufactured homes ot
40、her than the direct-vent system type that provide for separation of the combustion system from the atmosphere of the manufactured home by an installation method. 1.2 Requirements for the installation and use of heating appliances in manufactured homes and recreational vehicles are included in: a) Th
41、e Department of Housing and Urban Development Manufactured Home Construction and Safety Standards, Chapter II of 24 CFR, Part 3280-1994; and b) The Standard for Recreational Vehicles, NFPA 501C-1993. 1.3 An appliance designed to burn either oil or gas, and a gas appliance designed to be converted to
42、 burn oil by the installation of an optional factory-furnished burner, shall also comply with the requirements in the Standard for Liquid Fuel-Burning Heating Appliances for Manufactured Homes and Recreational Vehicles, UL 307A. 1.4 A product that contains features, characteristics, components, mate
43、rials, or systems new or different from those covered by the requirements in this Standard, and that involve a risk of re, electric shock, or injury to persons shall be evaluated using the appropriate additional component and end-product requirements as determined necessary to maintain the acceptabl
44、e level of safety as originally anticipated by the intent of this Standard. A product whose features, characteristics, components, materials, or systems conict with specic requirements or provisions of this Standard cannot be judged to comply with this Standard. Where considered appropriate, revisio
45、n of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this Standard. 2 General 2.1 Components 2.1.1 Except as indicated in 2.1.2, a component of a product covered by this standard shall comply with the requirements f
46、or that component. See Appendix A for a list of standards covering components generally used in the products covered by this standard. 2.1.2 A component need not comply with a specic requirement that: a) Involves a feature or characteristic not needed in the application of the component in the produ
47、ct covered by this standard; or b) Is superseded by a requirement in this standard. OCTOBER 31, 2006 UL 307B 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.1.3 A component shall be used in accordance with its recognized rating establishe
48、d for the intended conditions of use. 2.1.4 Specic components are recognized as being 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 and shall
49、 be used only under those specic conditions for which they have been recognized. 2.2 Units of measurement 2.2.1 If a value for measurement is followed by a value in other units in parentheses, the second value may be only approximate. The rst stated value is the requirement. 2.2.2 Unless indicated otherwise, all voltage and current values mentioned in this standard are rms. 2.3 Terminology 2.3.1 The term appliance as used in this standard refers to any heating appliance covered by this sta
