1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 307A Liquid Fuel-Burning Heating Appliances for Manufactured Homes and Recreational VehiclesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION
2、 FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Liquid Fuel-Burning Heating Appliances for Manufactured Homes and Recreational Vehicles, UL 307A Eighth Edition, Dated February 25, 2009 Summary of Topics Thi
3、s revision to UL 307A 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
4、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 requirement becomes effective. All right
5、s 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, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expresse
6、d 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, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out
7、 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 liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the elect
8、ronic 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 (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standa
9、rd 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. The prior text for requirements t
10、hat have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. SEPTEMBER 17, 2013 UL 307A tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 17, 201
11、3 UL 307A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 25, 2009 (Title Page Reprinted: September 17, 2013) 1 UL 307A Standard for Liquid Fuel-Burning Heating Appliances for Manufactured Homes and Recreatio
12、nal Vehicles The First edition was titled Gas- and Oil-Fired Heating Appliances for Trailer Coaches and numbered UL 307. The Second edition was titled Liquid Fuel-Burning Heating Appliances for Mobile Homes and Travel Trailers. The Third Fifth Editions were titled Liquid Fuel-Burning Heating Applian
13、ces for Mobile Homes and Recreational Vehicles. First Edition May, 1958 Second Edition October, 1965 Third Edition June, 1973 Fourth Edition October, 1976 Fifth Edition September, 1978 Sixth Edition May, 1990 Seventh Edition January, 1995 Eighth Edition February 25, 2009 This ANSI/UL Standard for Sa
14、fety consists of the Eighth Edition including revisions through September 17, 2013. The most recent designation of ANSI/UL 307A as a Reaffirmed American National Standard (ANS) occurred on July 12, 2013. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or
15、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 for Safety are copyrighted by
16、 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 2013 UNDERWRITERS LABORATORIES INC. ANSI/UL 307A-2005 (R2013)
17、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 20, 2009 UL 307A 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .6 2 Compo
18、nents 7 3 Units of Measurement .7 4 Glossary .7 CONSTRUCTION ALL APPLIANCES 5 Materials 11 6 Assembly .11 7 Accessibility for Servicing .15 8 Burner Equipment 16 9 Air-Intake Assemblies 16 10 Base 18 11 Drip Pan or Tray 18 12 Casing 19 13 Radiation Shields .19 14 Materials In Air Handling Compartmen
19、ts .20 14.1 General .20 14.2 Air lters 21 15 Combustion Chamber .21 16 Radiator .21 17 Heating-Surface Joints 21 18 Baffles.22 19 Flue Collar .23 20 Flue-Gas Outlet Assembly .23 21 Control Circuits .24 22 Controls .24 22.1 Application 24 22.2 Combustion air control 25 22.3 Limit control .25 22.4 Pri
20、mary safety control .26 WIRING METHODS ALL APPLIANCES 23 Field Wiring 26 23.1 General .26 23.2 Grounding .29 23.3 Cord connected appliances 29 24 Factory Wiring 31 25 Separation of Circuits .35 26 Bonding for Grounding 36 ELECTRICAL COMPONENTS ALL APPLIANCES 27 General 38 28 Mounting of Electrical C
21、omponents .39 29 Electrical Enclosures 40 30 Motors and Motor Overload Protection 49 FEBRUARY 25, 2009 UL 307A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 31 Capacitors .54 32 Electrical Insulating Material 54 33 Switches and Controller
22、s 55 SPACINGS ALL APPLIANCES 34 High-Voltage Circuits 55 35 Low-Voltage Circuits 57 PROTECTION OF USERS AND SERVICE PERSONNEL ALL APPLIANCES 36 General 57 CONSTRUCTION SPECIFIC APPLIANCES 37 Central Furnaces .60 38 Heating Boilers .61 39 Water Heaters 61 39.1 Temperature-regulating control .61 39.2
23、Limit control .62 39.3 Water storage vessels 62 39.4 Materials contacting water .63 39.5 Dip tubes 63 PERFORMANCE ALL APPLIANCES 40 General 63 41 Flammability Test .64 42 Test Installation Corner Location 65 43 Test Installation Upow, Downow, and Horizontal Furnaces for Alcove or Closet Location .69
24、 44 Supply and Return Ducts Forced-Air Appliances 74 45 Test Installation Heating Boilers and Water Heaters .75 46 Flue-Gas Outlet Assembly .75 47 Instrumentation .76 47.1 Draft measurement .76 47.2 Fuel input measurement 76 47.3 Power measurement 77 47.4 Speed measurement .77 47.5 Static pressure m
25、easurement 77 47.6 Temperature measurement 79 48 Initial Test Conditions .81 48.1 General .81 48.2 Static pressure for tests .82 49 Combustion Test Burner and Appliance 83 50 Operation Tests 83 51 Limit-Control Cutout Test Warm-Air Appliances and Boilers 84 52 Water-Heater Temperature Control Test .
26、84 53 Limit-Control Cutout Test Water Heater 85 54 Continuity of Operation Test Warm-Air Appliances .85 55 Temperature Test .86 56 Continuous Operation Temperature Test Central Heating Appliances 89 57 Continuous Operation Temperature Test Water Heaters .90 58 Blocked Register Temperature Test .90 F
27、EBRUARY 25, 2009 UL 307A 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 59 Blocked Outlet Temperature Test .91 60 Blocked Inlet Temperature Test 92 61 Fan Failure Temperature Test 93 62 Stalled Fan Motor Temperature Test 94 63 Air Flow Tes
28、t Horizontal Appliances .94 64 Seepage and Burnoff Temperature Tests 95 65 Direct Vent System Leakage Test 96 66 Short Circuit Test .97 67 Dielectric Voltage Withstand Test .99 68 Nonmetallic Dip Tube Tests .100 68.1 Deformation and weight loss 100 68.2 Resistance to crushing .100 68.3 Collapse .102
29、 69 Strain-Relief Test 103 70 Leakage-Current Test 103 MANUFACTURING AND PRODUCTION TESTS ALL APPLIANCES 71 General 106 72 Production-Line Grounding Continuity Test .107 MARKING ALL APPLIANCES 73 General 107 CONSTRUCTION OUTDOOR USE EQUIPMENT 74 General 113 75 Enclosure .113 75.1 General 113 75.2 Co
30、rrosion protection .114 76 Field-Wiring Connections .116 77 Wiring 116 78 Electrical Insulating Material 116 PERFORMANCE OUTDOOR USE EQUIPMENT 79 Rain Test .117 80 Gaskets 120 81 Metallic Coating Thickness Test .122 MARKING OUTDOOR USE EQUIPMENT 82 General 123 83 Instructions .123 APPENDIX A Standar
31、ds for ComponentsA1 FEBRUARY 25, 2009 UL 307A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements apply to the following types of liquid fuel-burning appliances intended for installation in manufactur
32、ed homes and recreational vehicles, including travel trailers, camping trailers, truck campers, motor homes, and park trailers. a) Direct vent system type heating appliances that provide for complete separation between the indoor atmosphere and combustion system, including the air supplied for combu
33、stion by inherent design of the furnace and its venting system. b) Vented heating appliances other than of the direct vent system type that provide for separation between the indoor atmosphere and combustion system, including the air supplied for combustion by an installation method. Such appliances
34、 can be used only in manufactured homes, not in recreational vehicles. 1.2 Requirements for the installation and use of these appliances are included in the following standards: a) For Manufactured Homes The Department of Housing and Urban Development Manufactured Home Construction and Safety Standa
35、rds, Title 24 CFR, Part 3280, 1994. b) For Recreational Vehicles The National Fire Protection Association Standard for Fire Safety Criteria for Recreational Vehicles, NFPA 501C-1993. 1.3 An appliance constructed to burn liquid fuel or gas and a liquid fuel burning appliance constructed and designed
36、so that it may be converted to burn gas by installation of a specic gas burner shall also comply with the applicable requirements in the Standard for Gas-Burning Heating Appliances for Manufactured Homes and Recreational Vehicles, UL 307B. 1.4 The term appliance as used in this standard refers to an
37、y heating appliance covered by this standard, such as a warm air central furnace, a wall furnace, a heating boiler, and a water heater. 1.5 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, a
38、nd that involves a risk of re or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, componen
39、ts, materials, or systems conict with specic requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard. FEBRUARY 25, 20
40、09 UL 307A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 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 Appendix A for a list of st
41、andards covering components generally used in the products covered by this standard. 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 su
42、perseded by a requirement 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 u
43、nder limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. 3 Units of Measurement 3.1 Unless otherwise indicated, all voltage and current values mentioned in this standard are rms values. 2.2.2 Values stated without paren
44、theses are the requirement. Values in parentheses are explanatory or approximate information. 4 Glossary 4.1 For the purpose of this standard, the following denitions apply. 4.2 ANTIFLOODING DEVICE A primary safety control that causes fuel ow to be shut off upon a rise in fuel level. It is intended
45、to operate to shut off the fuel ow before excessive fuel can be discharged into the appliance. 4.3 APPLIANCE FLUE The ue passages within the appliance. 4.4 AUTOMATICALLY LIGHTED APPLIANCE An appliance in which fuel to the main burner is turned on and ignited automatically. 4.5 BURNER: a) Automatical
46、ly Lighted One where fuel to the main burner is turned on and ignited by operation of an automatic control. b) Manually Lighted One where fuel to the main burner is turned on only by hand and ignited under supervision. c) Mechanical-Atomizing Type A power-operated burner that prepares and delivers t
47、he fuel and all or part of the air by mechanical process in controllable quantities for combustion. Some examples are air-atomizing, high- and low-pressure atomizing, horizontal-rotary atomizing, vertical-rotary atomizing, and vertical-rotary wall-ame burners. FEBRUARY 25, 2009 UL 307A 7UL COPYRIGHT
48、ED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL d) Mechanical-Draft Type A burner that includes a power driven fan, blower or other mechanism as the principal means for supplying air for combustion. e) Natural-Draft Type A burner that depends principall
49、y upon the natural draft created in the chimney to induce into the burner the air required for combustion. f) Vaporizing Type A burner consisting of a fuel vaporizing bowl or other receptacle to which liquid fuel may be fed in controllable quantities; the heat of combustion being used to vaporize the fuel, with provision for admitting air and mixing it with the fuel vapor in combustible proportions. 4.6 CENTRAL FURNACE A sel
