UL 307A-2018 UL Standard for Safety Liquid Fuel-Burning Heating Appliances for Manufactured Homes and Recreational Vehicles (Ninth Edition).pdf

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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 Vehicles STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTIO

2、N WITHOUT PERMISSION 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 Ninth Edition, Dated July 24, 2018 Summar

3、y of Topics This new edition of ANSI/UL 307A was issued to incorporate editorial updates. No 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

4、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, including but not limited to, the implied warranties of merchantabi

5、lity 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 the inability to use this Standard, even if UL or an authorized

6、 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 ULs Standards for Safety agree to defend, indemnify, and hold U

7、L 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 purchasers computer system. JULY 24, 2018 UL 307A tr1UL COPYRIGHTED MAT

8、ERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 24, 2018 UL 307A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 24, 2018 1 UL 307A Standard for Liquid Fuel-Burning H

9、eating Appliances for Manufactured Homes and Recreational 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 Ed

10、itions were titled Liquid Fuel-Burning Heating Appliances 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

11、Edition February, 2009 Ninth Edition July 24, 2018 This ANSI/UL Standard for Safety consists of the Ninth Edition. 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, Tra

12、nsmittal 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 Development System (CSDS) at https:/. ULs Standards for Safety are copyright

13、ed 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 2018 UNDERWRITERS LABORATORIES INC. ANSI/UL 307A-2005 (R

14、2013)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 24, 2018 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 Co

15、mponents6 3 Units of Measurement .7 4 Glossary .7 CONSTRUCTION ALL APPLIANCES 5 Materials11 6 Assembly .11 7 Accessibility for Servicing .15 8 Burner Equipment16 9 Air-Intake Assemblies 16 10 Base 18 11 Drip Pan or Tray18 12 Casing 19 13 Radiation Shields .19 14 Materials In Air Handling Compartment

16、s .20 14.1 General .20 14.2 Air lters 21 15 Combustion Chamber .21 16 Radiator .21 17 Heating-Surface Joints 21 18Baffles.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 Prima

17、ry 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 Wiring31 25 Separation of Circuits .35 26 Bonding for Grounding 36 ELECTRICAL COMPONENTS ALL APPLIANCES 27 General38 28 Mounting of Electrical Compon

18、ents .39 29 Electrical Enclosures 40 30 Motors and Motor Overload Protection 49 JULY 24, 2018 UL 307A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 31 Capacitors .54 32 Electrical Insulating Material54 33 Switches and Controllers 55 SPACI

19、NGS ALL APPLIANCES 34 High-Voltage Circuits 55 35 Low-Voltage Circuits 57 PROTECTION OF USERS AND SERVICE PERSONNEL ALL APPLIANCES 36 General57 CONSTRUCTION SPECIFIC APPLIANCES 37 Central Furnaces .60 38 Heating Boilers .61 39 Water Heaters61 39.1 Temperature-regulating control.61 39.2 Limit control

20、 .62 39.3 Water storage vessels 62 39.4 Materials contacting water .63 39.5 Dip tubes63 PERFORMANCE ALL APPLIANCES 40 General63 41 Flammability Test .64 42 Test Installation Corner Location 65 43 Test Installation Upow, Downow, and Horizontal Furnaces for Alcove or Closet Location .69 44 Supply and

21、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 measurement77 47.4 Speed measurement .77 47.5 Static pressure measurement 77 47

22、.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 Appliance83 50 Operation Tests 83 51 Limit-Control Cutout Test Warm-Air Appliances and Boilers 84 52 Water-Heater Temperature Control Test .84 53 Limit-Contr

23、ol 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 Appliances89 57 Continuous Operation Temperature Test Water Heaters .90 58 Blocked Register Temperature Test .90 JULY 24, 2018 UL 307

24、A 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 Test Horizontal Appliances

25、 .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 loss100 68.2 Resistance to crushing.100 68.3 Collapse .102 69 Strain-Relief Test 103

26、 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 Corrosion protection .114 76

27、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 Standards for ComponentsA1 JULY 24

28、, 2018 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 manufactured homes and recreational vehic

29、les, 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 combustion by inherent design of the

30、 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 can be used only in manufactur

31、ed 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 Standards, Title 24 CFR, Part 3280, 1

32、994. 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 so that it may be converted to

33、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 any heating appliance covered by

34、this standard, such as a warm air central furnace, a wall furnace, a heating boiler, and a water heater. 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 standards coveri

35、ng 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 superseded by a

36、requirement in this standard. JULY 24, 2018 UL 307A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.4 Specic components are incomp

37、lete 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 be used only under those specic conditions. 3 Units of Measurement 3.1 Unless otherwise in

38、dicated, all voltage and current values mentioned in this standard are rms values. 3.2 Values stated without parentheses 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 ANTIFLOO

39、DING DEVICE A primary safety control that causes fuel ow to be shut off upon a rise in fuel level. It is intended 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 APPLIANC

40、E An appliance in which fuel to the main burner is turned on and ignited automatically. 4.5 BURNER: a) Automatically 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 han

41、d and ignited under supervision. c) Mechanical-Atomizing Type A power-operated burner that prepares and delivers the 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 a

42、tomizing, vertical-rotary atomizing, and vertical-rotary wall-ame burners. 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 principally upon the natural d

43、raft 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 provisi

44、on for admitting air and mixing it with the fuel vapor in combustible proportions. JULY 24, 2018 UL 307A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4.6 CENTRAL FURNACE A self-contained appliance for heating air by transfer of heat of c

45、ombustion through metal to the air, and designed to supply heated air through ducts to spaces remote from or adjacent to the appliance location. 4.7 CONTROL a) LIMIT An automatic safety control responsive to changes in liquid level, pressure, or temperature and intended to be set beyond the operatin

46、g range for limiting the operation of the controlled equipment. b) OPERATING A control, other than a safety control or interlock, to start or regulate burner ring according to demand and to stop or regulate ring on satisfaction of demand or upon reaching the intended temperature or pressure in the a

47、ppliance being red. c) PRIMARY SAFETY The automatic safety control intended to prevent abnormal discharge of fuel at the burner in case of ignition failure or ame failure. d) SAFETY Automatic controls, including relays, switches, and other auxiliary equipment used in conjunction therewith to form a

48、safety control system, which is intended to prevent unsafe operation of the controlled equipment. e) SAFETY COMBUSTION A primary safety control responsive directly to ame properties; sensing the presence of ame and causing fuel to be shut off in event of ame failure. 4.8 DIRECT VENT SYSTEM APPLIANCE

49、 An appliance which is constructed so that all air supplied for combustion, the combustion system of the appliance, and all products of combustion are completely isolated from the atmosphere of the space in which it is installed. 4.9 DRAFT REGULATOR A device which functions to maintain a desired draft in the appliance by automatically reducing the chimney draft to the desired value. 4.10 ELECTRICAL CIRCUITS a)