1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 732 Oil-Fired Storage Tank Water HeatersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR F
2、URTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Oil-Fired Storage Tank Water Heaters, UL 732 Fifth Edition, Dated September 22, 1995 Summary of Topics This revision to UL 732 is being issued to remove the reference to the withdrawal date of UL 873 and to add
3、ress 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 publishing system is marked with a vertical line in the margin. Changes in requirements ar
4、e 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 part of this publication may be reproduced, stored in a retrieval system, or transmitted i
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9、se 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 revised and that have a future effective date are located after the Standard, and are prece
10、ded by a SUPERSEDED REQUIREMENTS notice. OCTOBER 9, 2013 UL 732 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 9, 2013 UL 732 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION
11、 WITHOUT PERMISSION FROM UL SEPTEMBER 22, 1995 (Title Page Reprinted: October 9, 2013) 1 UL 732 Standard for Oil-Fired Storage Tank Water Heaters The rst through third editions were titled Oil-Fired Water Heaters. First Edition July, 1955 Second Edition June, 1969 Third Edition June, 1974 Fourth Edi
12、tion February, 1988 Fifth Edition September 22, 1995 This ANSI/UL Standard for Safety consists of the Fifth Edition including revisions through October 9, 2013. The most recent designation of ANSI/UL 732 as a Reaffirmed American National Standard (ANS) occurred on July 12, 2013. ANSI approval for a
13、standard does not include the Cover Page, Transmittal Pages, Title Page, or 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 Deve
14、lopment 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 of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of
15、 UL. COPYRIGHT 2013 UNDERWRITERS LABORATORIES INC. ANSI/UL 732-1997 (R2013)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 20, 2009 OIL-FIRED STORAGE TANK WATER HEATERS - UL 732 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHOR
16、IZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Glossary .5 3 General 7 4 Components 8 CONSTRUCTION 5 Assembly 8 6 Accessibility for Servicing 9 7 Base 9 8 Casing 10 9 Radiation Shields 10 10 Insulation Materials .10 11 Combustion Chamber .
17、10 12 Heating Surface Joints 11 13 Baffles.12 14 Flue Collars 12 15 Damper and Draft Regulator .12 16 Materials Contacting Water 12 17 Water-Storage Vessels 12 18 Dip Tubes .13 19 Controls .13 19.1 Application 13 19.2 Limit control .14 19.3 Water-temperature regulating control .14 20 Field Wiring 15
18、 21 Internal Wiring 18 22 Separation of Circuits .22 23 Bonding for Grounding 23 ELECTRICAL COMPONENTS 24 General 25 25 Mounting of Electrical Components .26 26 Electrical Enclosures 26 27 Accessibility of Uninsulated Live Parts, Film-Coated Wire and Moving Parts .32 28 Motors and Motor Protection .
19、36 29 Switches and Controllers 40 30 Capacitors 40A 31 Electrical Insulating Material 41 32 Spacings High-Voltage Circuits .41 33 Spacings Low-Voltage Circuits 42 34 Protection of Users and Service Personnel 43 AUGUST 20, 2009 OIL-FIRED STORAGE TANK WATER HEATERS - UL 732 2AUL COPYRIGHTED MATERIAL N
20、OT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE 35 General 46 36 Test Installation for Other Than Alcove-or Closet-Installed Heaters .47 36.1 Enclosure .47 36.2 Chimney connector .48 37 Test Installation for Alcove-or Closet-Installed Units .49 37.1 Encl
21、osure .49 37.2 Chimney connector .51 38 Instrumentation .54 38.1 Draft measurement .54 38.2 Fuel-input measurement 54 38.3 Power measurement 54 38.4 Speed measurement .55 38.5 Temperature measurement 55 39 Initial Test Conditions .57 39.1 General .57 39.2 Heater equipped with mechanical atomizing bu
22、rner .58 39.3 Heater equipped with vaporizing burner .58 40 Combustion Test Burner and Water Heater 58 41 Water-Temperature Control Test 59 42 Limit-Control Cutout Test 59 43 Temperature Test .60 44 Seepage and Burnoff Test Vaporizing Burner 65 45 Hydrostatic Test on Water-Storage Vessels 66 46 Shor
23、t-Circuit Test .66 47 Dielectric Voltage-Withstand Test .68 48 Torque Test on Screws and Bolts .69 49 Securement Tests on Constant-Level Valve Assemblies .70 50 Bonding-Conductor Test .70 51 Strain-Relief Test .70 52 Nonmetallic Dip Tube Tests 71 52.1 Deformation and weight loss .71 52.2 Resistance
24、to crushing 71 52.3 Collapse 73 MANUFACTURING AND PRODUCTION TESTS 53 General 74 MARKING 54 General 75 INSTALLATION INSTRUCTIONS 55 General 76 APPENDIX A Standards for Components .A1 APRIL 22, 2010 OIL-FIRED STORAGE TANK WATER HEATERS - UL 732 2BUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REP
25、RODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 3, 2005 OIL-FIRED STORAGE TANK WATER HEATERS - UL 732 3 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. FEBRUARY 3, 2005 OI
26、L-FIRED STORAGE TANK WATER HEATERS - UL 732 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover oil-red storage-tank water-heating appliances having a fuel input of not more than 200,000 Btu per
27、 hour (60 kW). These requirements do not apply to heaters that include storage vessels having a water capacity of more than 120 gallons (454.2 liters), or that are intended for heating water to a temperature of more than 200F (93.3C). 1.2 Requirements for the installation and use of oil-burning equi
28、pment are included in the Standard for the Installation of Oil Burning Equipment, ANSI/NFPA 31 and the BOCA Basic/National Mechanical Code. 1.3 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standar
29、d, and 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, comp
30、onents, 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. 2 Glossary
31、2.1 For the purpose of this standard the following denitions apply. 2.2 ANTIFLOODING DEVICE A primary safety control that causes the fuel ow to be shut off upon a rise in fuel level or upon receiving excess fuel, and that operates before discharge of fuel can occur. 2.3 APPLIANCE FLUE The ue passage
32、s within the appliance. 2.4 AUTOMATICALLY LIGHTED APPLIANCE An appliance in which fuel to the main burner is turned on and ignited automatically. 2.5 BAFFLE An object placed in an appliance to direct the ow of air or ue gases. 2.6 BURNER A device for the nal conveyance of fuel or a mixture of fuel a
33、nd air to the combustion zone. 2.7 BURNER, MECHANICAL-ATOMIZING 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 and ve
34、rtical rotary atomizing, and vertical rotary wall-ame burners. 2.8 BURNER, MECHANICAL-DRAFT A burner that includes a power driven fan, blower, or other mechanism as the principal means for supplying air for combustion. 2.9 BURNER, NATURAL-DRAFT A burner that principally depends upon the natural draf
35、t created in the ue to induce into the burner the air required for combustion. FEBRUARY 3, 2005 OIL-FIRED STORAGE TANK WATER HEATERS - UL 732 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.10 BURNER, VAPORIZING A burner consisting of an
36、oil-vaporizing bowl or other receptacle to which liquid fuel may be fed in controllable quantities; the heat of combustion is used to vaporize the fuel, with provision for admitting air and mixing it with the fuel vapor in combustible proportions. 2.11 CASING An enclosure forming the outside of the
37、appliance, no parts of which are likely to be subjected to intense heat. 2.12 CHIMNEY CONNECTOR The pipe that connects a solid or liquid fuel-burning appliance to a chimney. 2.13 COMBUSTIBLE MATERIAL Combustible material as pertaining to materials adjacent to or in contact with heat-producing applia
38、nces, chimney connectors and vent connectors, steam and hot-water pipes, and warm-air ducts means material made of or surfaced with wood, compressed paper, plant bers, or other material that will ignite and burn. Such material shall be considered as combustible even though ameproofed, re-retardant t
39、reated, or plastered. 2.14 COMBUSTION The rapid oxidation of fuel accompanied by the production of heat, or heat and light. 2.15 COMBUSTION CHAMBER The portion of an appliance within which combustion occurs. 2.16 COMBUSTION (FLAME) SAFEGUARD A safety combustion control. 2.17 CONSTANT-LEVEL VALVE A d
40、evice that maintains a constant level of fuel oil in a reservoir for delivery to the burner. 2.18 CONTROL A device intended to regulate the fuel, air, water, or electrical supply to the controlled equipment. It may be automatic, semiautomatic, or manual. 2.19 CONTROL, LIMIT An automatic safety contr
41、ol responsive to changes in liquid level, pressure, or temperature; for limiting the operation of the controlled equipment. 2.20 CONTROL, SAFETY An automatic control including a relay, switch, or other auxiliary equipment used in conjunction therewith to form a safety control system that is intended
42、 to reduce the likelihood of operation of the controlled equipment that would result in a risk of re or injury to persons. 2.21 CONTROL, PRIMARY-SAFETY An automatic safety control intended to reduce the likelihood of abnormal discharge of fuel at the burner in case of ignition failure or ame failure
43、. 2.22 CONTROL, 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. 2.23 DRAFT REGULATOR A device that functions to maintain a desired draft in the appliance by automatically reducing t
44、he chimney draft to the desired value. SEPTEMBER 22, 1995 OIL-FIRED STORAGE TANK WATER HEATERS - UL 732 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.24 ELECTRICAL CIRCUITS: a) High-Voltage Circuit A circuit involving a potential of not
45、 more than 600 volts and having circuit characteristics in excess of those of a low-voltage circuit. b) Low-Voltage Circuit A circuit involving a potential of not more than 30 volts rms alternating-current (42.4 volts peak or direct current) and supplied by: 1) A primary battery; 2) A Class 2 transf
46、ormer; or 3) A combination of transformer and xed impedance that, as a unit, complies with all the performance requirements for a Class 2 transformer. A circuit derived from a high-voltage circuit, by connecting resistance in series with the supply circuit as a means of limiting the voltage and curr
47、ent is not considered to be a low-voltage circuit. c) Safety-Control Circuit A circuit involving one or more safety controls. 2.25 FLUE COLLAR That portion of an appliance constructed for attachment of the chimney or vent connector. 2.26 FLUE GASES Combustion products and excess air. 2.27 FUEL OIL A
48、ny hydrocarbon oil dened by Standard Specications for Fuel Oils, ASTM D396-1992. 2.28 HEATING SURFACE A surface that transmits heat directly from ame or ue gases to the medium to be heated. 2.29 INDIRECT-FIRED APPLIANCE An appliance constructed so that combustion products or ue gases are not mixed i
49、n the appliance with the medium to be heated; hence is provided with a ue collar. 2.30 MAINTENANCE The periodic tasks usually performed to operate and maintain an appliance, such as air, fuel, pressure, and temperature regulation, cleaning, lubrication, resetting of controls, and the like. Repair and replacement of parts other than those expected to be renewed periodically is not considered to be maintenance. Some examples of
