• UL 731:6ED 2018-01

    Current The latest, up-to-date edition.

    Oil-Fired Unit Heaters

    Available format(s):  Hardcopy

    Language(s):  English

    Published date:  31-01-2018

    Publisher:  Underwriters Laboratories

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    Table of Contents - (Show below) - (Hide below)

    Foreword
    Introduction
    1. Scope
    2. Glossary
    3. Components
    Construction
    4. Assembly
    5. Burners
    6. Accessibility for Servicing
    7. Disposal of Combustion Products
    8. Base
    9. Casing
    10. Radiation Shields and Materials in Air-Handling
         Compartments
    11. Air Filter
    12. Combustion Chamber
    13. Radiator
    14. Heating Surface Joints
    15. Baffles
    16. Flue Collar
    17. Damper and Draft Regulator
    18. Controls
    19. Field Wiring
    20. Internal Wiring
    21. Separation of Circuits
    22. Bonding for Grounding
    23. Electrical Components - General
    24. Mounting of Electrical Components
    25. Electrical Enclosures
    26. Motors and Motor Overload Protection
    27. Overcurrent Protection of High-Voltage Control-
         Circuit Conductors
    28. Overcurrent Protection of Transformers
    29. Switches and Controllers
    30. Capacitors
    31. Electrical Insulating Material
    32. High-Voltage Circuits Spacings
    33. Low-Voltage Circuits Spacings
    Protection of Users and Service Personnel
    34. General
    Performance
    35. General
    36. Test Installation - Floor-Mounted Heaters
    37. Test Installation - Suspended Type Heaters
    38. Instrumentation
    39. Initial Test Conditions
    40. Combustion Test - Burner and Heater
    41. Continuous Operation Tests
    42. Limit Control Cutout Test
    43. Continuity of Operation Test
    44. Temperature Test
    45. Continuous Operation Temperatures
    46. Fan Failure Test
    47. Stalled Fan Motor Test
    48. Blocked Inlet Test
    49. Short Circuit Test
    50. Overload Test, High-Voltage Transformers
    51. Burnout Test, High-Voltage Transformers
    52. Dielectric Voltage-Withstand Test
    Manufacturing and Production Tests
    53. General
    Marking
    54. General
    Installation Instructions
    55. General
    Appendix A
    Standards for Components

    Abstract - (Show below) - (Hide below)

    This revision of ANSI/UL 731 dated November 11, 2021 is being issued to update the title page to reflect the most recent designation as a Reaffirmed American National Standard (ANS).

    Scope - (Show below) - (Hide below)

    1.1 These requirements apply to oil-fired unit heaters as defined herein.

    General Product Information - (Show below) - (Hide below)

    Development Note NEW CHILD REV 1 2021 IS NOW ADDED
    Document Type Standard
    Product Note NEW CHILD REV 1 2021 IS NOW ADDED
    Publisher Underwriters Laboratories
    Status Current

    Standards Referencing This Book - (Show below) - (Hide below)

    UL 514A:11ED 2013-02 Metallic Outlet Boxes
    UL 5085-3:1ED 2006-04 Low Voltage Transformers - Part 3: Class 2 and Class 3 Transformers
    UL 61131-2:2ED 2008-06 Programmable Controllers - Part 2: Equipment Requirements and Tests
    UL 4248-11:1ED 2007-02 Fuseholders - Part 11: Type C (Edison Base) and Type S Plug Fuse
    UL 343:9ED 2008-12 Pumps for Oil-Burning Appliances
    UL 83:16ED 2017-07 Standard for Thermoplastic-Insulated Wires and Cables
    UL 4248-9:1ED 2007-02 Fuseholders - Part 9: Class K
    UL 6 : 2014 ELECTRICAL RIGID METAL CONDUIT - STEEL
    UL 296:11ED 2017-02 Oil Burners
    UL 248-12:3ED 2011-05 Low-Voltage Fuses - Part 12: Class R Fuses
    UL 248-11:3ED 2011-05 Low-Voltage Fuses - Part 11: Plug Fuses
    UL 372:6ED 2007-07 Automatic Electrical Controls for Household and Similar Use - Part 2: Particular Requirements for Burner Ignition Systems and Components
    UL 746A:6ED 2012-09 Polymeric Materials - Short Term Property Evaluations
    UL 429:7ED 2013-11 Electrically Operated Valves
    UL 60730-1:5ED 2016-08 Automatic Electrical Controls - Part 1: General Requirements
    UL 4248-6:1ED 2007-02 Fuseholders - Part 6: Class H
    UL 4248-15:1ED 2007-02 Fuseholders - Part 15: Class T
    UL 4248-4:1ED 2007-02 Fuseholders - Part 4: Class CC
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