1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 727 Oil-Fired Central FurnacesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REP
2、RODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Oil-Fired Central Furnaces, UL 727 Ninth Edition, Dated April 7, 2006 Summary of Topics This revision to UL 727 is being issued to remove the reference to the withdrawal date of UL 873 and to address universal upkeep of
3、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 are marked with a vertical
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7、ility 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 UL harmless from and against any loss, expense, li
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9、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that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUI
10、REMENTS notice. OCTOBER 9, 2013 UL 727 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 9, 2013 UL 727 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM
11、UL APRIL 7, 2006 (Title Page Reprinted: October 9, 2013) 1 UL 727 Standard for Oil-Fired Central Furnaces First Edition March, 1955 Second Edition October, 1957 Third Edition August, 1961 Fourth Edition August, 1972 Fifth Edition June, 1973 Sixth Edition July, 1980 Seventh Edition November, 1986 Eig
12、hth Edition August, 1994 Ninth Edition April 7, 2006 This UL Standard for Safety consists of the Ninth edition including revisions through October 9, 2013. The Department of Defense (DoD) has adopted UL 727 on June 17, 1994 . The publication of revised pages or a new edition of this Standard will no
13、t invalidate the DoD adoption. 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
14、 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 2013 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL
15、 NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 7, 2006 OIL-FIRED CENTRAL FURNACES - UL 727 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS PART 1 ALL PRODUCTS INTRODUC
16、TION 1 Scope .6 2 Units of Measurement .6 3 Glossary .6 4 Components 10 CONSTRUCTION MECHANICAL 5 Assembly .11 6 Servicing 13 6.1 General 13 6.2 Moving parts 13 7 Disposal of Combustion Products 14 8 Base .14 9 Casings .16 10 Radiation Shields or Liners 17 11 Materials in Air Handling Compartments .
17、17 12 Air Filters 19 13 Combustion Chambers 19 14 Radiators 19 15 Heating Surface Joints 19 16 Baffles.20 17 Flue Collars 21 18 Dampers and Draft Regulators .21 CONSTRUCTION ELECTRICAL 19 Controls .21 19.1 Application 21 19.2 Limit control .22 19.3 Fan control 23 20 Field Wiring 23 20.1 General .23
18、20.2 Leads and terminals 25 21 Internal Wiring 26 21.1 General .26 21.2 Methods 27 21.3 Short circuit protection 30 22 Separation of Circuits .30 23 Bonding for Grounding 32 24 Servicing and Adjustment 35 25 Electrical Components .36 26 Mounting of Electrical Components .36 27 Electrical Enclosures
19、37 27.1 General .37 27.2 Doors and covers 45 APRIL 7, 2006 OIL-FIRED CENTRAL FURNACES - UL 727 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 27.3 Field wiring system connections 46 28 Motors and Motor Overload Protection 47 29 Overcurrent
20、 Protection of High-Voltage Control-Circuit Conductors 52 29.1 General .52 29.2 Direct-connected high-voltage control circuit .52 29.3 Tapped high-voltage control circuits 52 29.4 Overcurrent-protective devices .53 30 Overcurrent Protection of Transformers 54 30.1 High-voltage transformers .54 30.2
21、Low-voltage transformers 55 31 Switches and Controllers 56 32 Capacitors .57 33 Electrical Insulating Material 57 34 Spacings High-Voltage Circuit 57 35 Spacings Low-Voltage Circuits 59 36 Accessibility of Uninsulated Live Parts .59 PERFORMANCE 37 General 61 38 Test Installation for Standard Clearan
22、ces 62 38.1 Downow and upow furnaces (for installation in other than closets or alcoves) 62 38.2 Horizontal furnace 68 39 Test Installation for Alcove or Closet 71 39.1 Downow, upow, and horizontal furnaces 71 39.2 Air outlet and inlet 79 40 Instrumentation .80 40.1 Draft 80 40.2 Fuel input .80 40.3
23、 Power measurement 80 40.4 Speed measurement .81 40.5 Static pressure .81 40.6 Temperature measurement 83 41 Initial Test Conditions .85 41.1 General .85 41.2 Furnace equipped with mechanical atomizing burner .86 41.3 Furnace equipped with vaporizing burner 86 41.4 Static pressures for tests 87 42 C
24、ombustion Test Burner and Furnace .88 43 Operation Tests 88 44 Limit Control Cutout Test 89 45 Continuity of Operation Test .89 46 Airow, Downow or Horizontal Furnace Test 90 47 Temperature Tests 91 47.1 General .91 48 Continuous Operation Test .94 49 Blocked Inlet Test .94 50 Fan Failure Test 95 51
25、 Stalled Fan Motor Test 96 52 Blocked Outlet Test .97 53 Short-Circuit Test .98 54 Overload Test, High-Voltage Transformers 100 55 Burnout Test, High-Voltage Transformers .101 APRIL 7, 2006 OIL-FIRED CENTRAL FURNACES - UL 727 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRI
26、BUTION WITHOUT PERMISSION FROM UL 56 Dielectric Voltage-Withstand Test 102 57 Flammability Test 102 MANUFACTURING AND PRODUCTION TESTS 58 General 103 59 Production Line Dielectric Voltage-Withstand Test .104 MARKING 60 General 105 INSTRUCTIONS 61 Operating and Installation Instructions 107 PART 2 OU
27、TDOOR-USE EQUIPMENT CONSTRUCTION 62 General 108 63 Enclosure .108 63.1 General 108 63.2 Corrosion protection .109 64 Field-Wiring Connections .111 65 Internal Wiring .111 66 Electrical Insulating Material 111 PERFORMANCE 67 Rain Test .112 68 Wind Test 115 69 Accelerated Aging Test Gaskets, Adhesives
28、, and Sealing Compounds .116 70 Metallic Coating Thickness Test .117 MARKING 71 General 118 APPENDIX A Standards for Components .A1 APRIL 7, 2006 OIL-FIRED CENTRAL FURNACES - UL 727 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PART 1 ALL
29、 PRODUCTS INTRODUCTION 1 Scope 1.1 These requirements cover oil-red central furnaces which include forced-air furnaces of the downow, horizontal, and upow types. Floor-mounted unit heaters designed to supply heated air through ducts are covered also by these requirements. 1.2 These requirements cove
30、r furnaces intended to burn standard grade fuel oils as specied in the Specications for Fuel Oils, ASTM D396. 1.3 Requirements for the installation and use of oil-burning equipment are included in the Standard for Installation of Oil-Burning Equipment, NFPA 31, and in codes such as the BOCA National
31、 Mechanical Code, the SBCC Standard Mechanical Code, and the IAPMO Uniform Mechanical Code. The applicable requirements are to be utilized in conjunction with this standard. 2 Units of Measurement 2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or app
32、roximate information. 3 Glossary 3.1 For the purpose of this standard the following denitions apply. 3.2 AIR SHUTTER An adjustable device for varying the size of the air inlet or inlets regulating primary and/or secondary air. 3.3 ANTIFLOODING DEVICE A primary safety control which causes the fuel ow
33、 to be shut off upon a rise in fuel level or upon receiving excess fuel, and that operates before the hazardous discharge of fuel can occur. 3.4 APPLIANCE Refers to any equipment covered by these requirements unless specically noted otherwise. 3.5 APPLIANCE FLUE The ue passages within the appliance.
34、 3.6 AUTOMATICALLY LIGHTED APPLIANCE An appliance in which fuel to the main burner is turned on and ignited automatically. 3.7 BURNER, MECHANICAL-ATOMIZING TYPE A power-operated burner that prepares and delivers the oil and all or part of the air by mechanical process in controllable quantities for
35、combustion. Some examples are air and steam atomizing, high and low pressure atomizing, horizontal rotary, vertical rotary atomizing, and vertical rotary wall-ame burners. 3.8 BURNER, MECHANICAL DRAFT TYPE A burner that includes a power-driven fan, blower, or other mechanism as the principal means f
36、or supplying air for combustion. 3.9 BURNER, NATURAL DRAFT TYPE A burner that depends principally upon the natural draft created in the ue to induce into the burner the air required for combustion. APRIL 7, 2006 OIL-FIRED CENTRAL FURNACES - UL 727 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER
37、REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.10 BURNER, VAPORIZING TYPE A burner consisting of an oil-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
38、and mixing it with the oil vapor in combustible proportions. 3.11 COMBUSTIBLE Is dened in the Standard Glossary of Terms Relating to Chimneys, Vents, and Heat Producing Appliances, NFPA 97M. 3.12 CONSTANT-LEVEL VALVE A device for maintaining within a reservoir a constant level of fuel for delivery t
39、o the burner. 3.13 CONTROL, LIMIT As it pertains to this standard, a safety control responsive to changes in temperature normally set beyond the intended operating range of the furnace to limit its operation. 3.14 CONTROL, OPERATING A control, other than a safety control or interlock, to start or re
40、gulate input according to demand, and to stop or regulate input on satisfaction of demand. Operating controls may also actuate auxiliary equipment. 3.15 CONTROL, SAFETY Automatic controls, including relays, switches, and other auxiliary equipment used in conjunction therewith to form a safety contro
41、l system, that are intended to reduce the risk of improper operation of the controlled equipment. 3.16 CONTROL, PRIMARY SAFETY The automatic safety control intended to reduce the risk of abnormal discharge of oil at the burner in case of ignition failure or ame failure. 3.17 CONTROL, SAFETY COMBUSTI
42、ON See Control, Primary Safety. 3.18 DRAFT REGULATOR, BAROMETRIC (AUTOMATIC DAMPER) A device that functions to maintain a desired draft in the appliance by automatically reducing excess chimney draft to the desired value. 3.19 ELECTRICAL CIRCUITS: a) High-Voltage Circuit A circuit involving a potent
43、ial of not 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 Class 2 transformer, or b
44、y a battery, by a battery and xed impedance, or by a transformer and xed impedance each of which, as a unit is in compliance with what is required for a Class 2 transformer; or 2) Is limited to a maximum of 100 volt-amperes. A circuit derived from a source of supply classied as a high-voltage circui
45、t, by connecting resistance in series with the supply circuit as a means of limiting the voltage and current, is not considered to be a low-voltage circuit. c) Isolated Limited Secondary Circuit A circuit of limited energy derived from an isolated secondary winding of a transformer having a maximum
46、capacity of 100 volt-amperes and open- circuit secondary voltage rating not exceeding 1000 volts. d) Safety Control Circuit A circuit involving one or more safety controls. APRIL 7, 2006 OIL-FIRED CENTRAL FURNACES - UL 727 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUT
47、ION WITHOUT PERMISSION FROM UL 3.20 FUEL OIL Any hydrocarbon oil as dened by Specications for Fuel Oils, ASTM D396-86. 3.21 FURNACE, CENTRAL WARM-AIR A self-contained indirect-red appliance constructed to supply heated air through ducts to spaces remote from or adjacent to the appliance location. 3.
48、22 FURNACE, ATTIC CENTRAL A forced-air type central furnace designed specically for installation in an attic or in a space with low headroom, normally unoccupied. 3.23 FURNACE, DOWNFLOW A forced-air type central furnace constructed with air ow through the furnace essentially in a vertical path, disc
49、harging air at or near the bottom of the furnace. See Figure 3.1. 3.24 FURNACE, HORIZONTAL A forced-air type central furnace constructed with air ow through the furnace essentially in a horizontal path. See Figure 3.1. 3.25 FURNACE, UPFLOW A central furnace constructed with air ow through the furnace essentially in a vertical path, discharging air at or near the top of the furnace. See Figure 3.1. 3.26 INDIRECT-FIRED AP
