1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 727 Oil-Fired Central Furnaces STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHOR
2、IZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Oil-Fired Central Furnaces, UL 727 Tenth Edition, Dated January 31, 2018 Summary of Topics This New Edition of UL 727 is being issued to address the editorial maintenance of UL Standards for Safety. A
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5、sing out 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 t
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7、c Standard on the purchasers computer system. JANUARY 31, 2018 UL 727 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 31, 2018 UL 727 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTR
8、IBUTION WITHOUT PERMISSION FROM UL JANUARY 31, 2018 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 Eighth E
9、dition August, 1994 Ninth Edition April, 2006 Tenth Edition January 31, 2018 This UL Standard for Safety consists of the Tenth edition. 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 not invalidate the DoD
10、 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 https:/. ULs Standards for Safety are copyrighted by UL. Neither a p
11、rinted 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.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR
12、 FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 31, 2018 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 INTRODUCTION 1 Scope .6
13、2 Units of Measurement .6 3 Glossary .6 4 Components 11 CONSTRUCTION MECHANICAL 5 Assembly .11 6 Servicing13 6.1 General 13 6.2 Moving parts 14 7 Disposal of Combustion Products 15 8 Base .15 9 Casings.17 10 Radiation Shields or Liners 18 11 Materials in Air Handling Compartments .18 12 Air Filters
14、20 13 Combustion Chambers 20 14 Radiators 20 15 Heating Surface Joints 20 16Baffles.21 17 Flue Collars 22 18 Dampers and Draft Regulators .22 CONSTRUCTION ELECTRICAL 19 Controls .22 19.1 Application 22 19.2 Limit control .23 19.3 Fan control 24 20 Field Wiring 24 20.1 General .24 20.2 Leads and term
15、inals 26 21 Internal Wiring27 21.1 General .27 21.2 Methods 28 21.3 Short circuit protection 31 22 Separation of Circuits .31 23 Bonding for Grounding 33 24 Servicing and Adjustment 36 25 Electrical Components.37 26 Mounting of Electrical Components .37 27 Electrical Enclosures 38 27.1 General .38 2
16、7.2 Doors and covers 46 JANUARY 31, 2018 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 connections47 28 Motors and Motor Overload Protection 48 29 Overcurrent Protection of High
17、-Voltage Control-Circuit Conductors52 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 Transformers54 30.1 High-voltage transformers .54 30.2 Low-voltage transform
18、ers55 31 Switches and Controllers 56 32 Capacitors .57 33 Electrical Insulating Material57 34 Spacings High-Voltage Circuit 57 35 Spacings Low-Voltage Circuits59 36 Accessibility of Uninsulated Live Parts.59 PERFORMANCE 37 General61 38 Test Installation for Standard Clearances 62 38.1 Downow and upo
19、w 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 Power measurement80 40.4 S
20、peed 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 burner86 41.4 Static pressures for tests 87 42 Combustion Test Burner and Fur
21、nace .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 Tests91 47.1 General .91 48 Continuous Operation Test.94 49 Blocked Inlet Test.94 50 Fan Failure Test 95 51 Stalled Fan Motor Test 96 52 Bl
22、ocked Outlet Test .97 53 Short-Circuit Test .98 54 Overload Test, High-Voltage Transformers100 55 Burnout Test, High-Voltage Transformers.101 JANUARY 31, 2018 OIL-FIRED CENTRAL FURNACES - UL 727 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM
23、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 Instructions107 PART 2 OUTDOOR-USE EQUIPMENT CONSTRUCTION
24、 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, and Sealing Compounds .116 70 Me
25、tallic Coating Thickness Test .117 MARKING 71 General 118 APPENDIX A Standards for Components .A1 JANUARY 31, 2018 OIL-FIRED CENTRAL FURNACES - UL 727 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PART 1 ALL PRODUCTS INTRODUCTION 1 Scope
26、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 cover furnaces intended to burn sta
27、ndard grade fuel oils as specied in the Specications for Fuel Oils, ASTM D396. 1.3 The oil-burning equipment covered by these requirements are intended for installation in accordance with the National Fire Protection Association Standard for Installation of Oil-Burning Equipment, NFPA 31, the Intern
28、ational Mechanical Code and the Uniform Mechanical Code. 2 Units of Measurement 2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 3 Glossary 3.1 For the purpose of this standard the following denitions apply. 3.2 AIR SHUTTER
29、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 to be shut off upon a rise in fuel level or upon receiving excess fuel, and that operates before the hazardous disch
30、arge 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. 3.6 AUTOMATICALLY LIGHTED APPLIANCE An appliance in which fuel to the main burner is turned on and ignited automatic
31、ally. 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 combustion. Some examples are air and steam atomizing, high and low pressure atomizing, horizontal rotary, vertical r
32、otary atomizing, and vertical rotary wall-ame burners. JANUARY 31, 2018 OIL-FIRED CENTRAL FURNACES - UL 727 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.8 BURNER, MECHANICAL DRAFT TYPE A burner that includes a power-driven fan, blower,
33、 or other mechanism as the principal means for supplying air for combustion. 3.9 BURNER,NATURALDRAFTTYPEAburnerthatdependsprincipallyuponthenaturaldraftcreated in the ue to induce into the burner the air required for combustion. 3.10 BURNER, VAPORIZING TYPE A burner consisting of an oil-vaporizing b
34、owl 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 oil vapor in combustible proportions. 3.11 COMBUSTIBLE Is dened in the Standard Glossary of Terms Relati
35、ng 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 to the burner. 3.13 CONTROL, LIMIT As it pertains to this standard, a safety control responsive to changes in temperature normal
36、ly 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 regulate input according to demand, and to stop or regulate input on satisfaction of demand. Operating controls may also actuate
37、auxiliary equipment. 3.15 CONTROL, SAFETY Automatic controls, including relays, switches, and other auxiliary equipment used in conjunction therewith to form a safety control system, that are intended to reduce the risk of improper operation of the controlled equipment. 3.16 CONTROL, PRIMARY SAFETY
38、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 COMBUSTION See Control, Primary Safety. 3.18 DRAFT REGULATOR, BAROMETRIC (AUTOMATIC DAMPER) A device that functions to maintain a desir
39、ed 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 potential of not more than 600 volts and having circuit characteristics in excess of those of a low-voltage circuit. b) Low-Voltage C
40、ircuit 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 by a battery, by a battery and xed impedance, or by a transformer and xed impedance each of which, as a unit is in compliance wi
41、th 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 circuit, by connecting resistance in series with the supply circuit as a means of limiting the voltage and current, is not considered
42、 to be a low-voltage circuit. JANUARY 31, 2018 OIL-FIRED CENTRAL FURNACES - UL 727 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL c) Isolated Limited Secondary Circuit A circuit of limited energy derived from an isolated secondary winding
43、of a transformer having a maximum 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. 3.20 FUEL OIL Any hydrocarbon oil as dened by Specications for Fuel Oils, ASTM D396-86. 3.21
44、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. 3.22 FURNACE,ATTICCENTRALAforced-airtypecentralfurnacedesignedspecicallyforinstallation in an attic or in a space with low hea
45、droom, normally unoccupied. 3.23 FURNACE, DOWNFLOW A forced-air type central furnace constructed with air ow through the furnace essentially in a vertical path, discharging air at or near the bottom of the furnace. See Figure 3.1. This is generated text for gtxt. JANUARY 31, 2018 OIL-FIRED CENTRAL F
46、URNACES - UL 727 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Figure 3.1 Types of forced-air central furnaces Note: Arrows indicate direction of air ow JANUARY 31, 2018 OIL-FIRED CENTRAL FURNACES - UL 727 9UL COPYRIGHTED MATERIAL NOT AUT
47、HORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 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
48、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 APPLIANCE An appliance constructed so that combustion products or ue gases are not mixed in the appliance with the medium, that is, to be heated; hence is provided with
49、a ue collar. 3.27 NONCOMBUSTIBLE Is dened in the standard Glossary of Terms Relating to Chimneys, Vents, and Heating Producing Appliances, NFPA 97M. 3.28 RADIATION SHIELDAs eparate panel or panels interposed between heating surfaces and adjacent objects to reduce heat transmission by radiation. 3.29 RADIATOR Auxiliary heat transfer surfaces within the casing, connected between the combustion chamber and the ue
