UL 727
Standard for Oil-Fired Central Furnaces

DETAILS
Edition Number:10SCC Approved:--
Edition Date:2018-01-31DOD Approved: 1994-06-17
Price Code:BANSI Approved: --
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover oil-fired central furnaces which include forced-air furnaces of the downflow, horizontal, and upflow 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 standard grade fuel oils as specified in the Specifications 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 International Mechanical Code and the Uniform Mechanical Code.

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • PART 1 – ALL PRODUCTS
          • INTRODUCTION
          • 1 Scope
          • 2 Units of Measurement
          • 3 Glossary
          • 4 Components
          • CONSTRUCTION – MECHANICAL
          • 5 Assembly
          • 6 Servicing
            • 6.1 General
            • 6.2 Moving parts
          • 7 Disposal of Combustion Products
          • 8 Base
          • 9 Casings
          • 10 Radiation Shields or Liners
          • 11 Materials in Air Handling Compartments
          • 12 Air Filters
          • 13 Combustion Chambers
          • 14 Radiators
          • 15 Heating Surface Joints
          • 16 Baffles
          • 17 Flue Collars
          • 18 Dampers and Draft Regulators
          • CONSTRUCTION – ELECTRICAL
          • 19 Controls
            • 19.1 Application
            • 19.2 Limit control
            • 19.3 Fan control
          • 20 Field Wiring
            • 20.1 General
            • 20.2 Leads and terminals
          • 21 Internal Wiring
            • 21.1 General
            • 21.2 Methods
            • 21.3 Short circuit protection
          • 22 Separation of Circuits
          • 23 Bonding for Grounding
          • 24 Servicing and Adjustment
          • 25 Electrical Components
          • 26 Mounting of Electrical Components
          • 27 Electrical Enclosures
            • 27.1 General
            • 27.2 Doors and covers
            • 27.3 Field wiring system connections
          • 28 Motors and Motor Overload Protection
          • 29 Overcurrent Protection of High-Voltage Control-Circuit Conductors
            • 29.1 General
            • 29.2 Direct-connected high-voltage control circuit
            • 29.3 Tapped high-voltage control circuits
            • 29.4 Overcurrent-protective devices
          • 30 Overcurrent Protection of Transformers
            • 30.1 High-voltage transformers
            • 30.2 Low-voltage transformers
          • 31 Switches and Controllers
          • 32 Capacitors
          • 33 Electrical Insulating Material
          • 34 Spacings – High-Voltage Circuit
          • 35 Spacings – Low-Voltage Circuits
          • 36 Accessibility of Uninsulated Live Parts
          • PERFORMANCE
          • 37 General
          • 38 Test Installation for Standard Clearances
            • 38.1 Downflow and upflow furnaces (for installation in other than closets or alcoves)
            • 38.2 Horizontal furnace
          • 39 Test Installation for Alcove or Closet
            • 39.1 Downflow, upflow, and horizontal furnaces
            • 39.2 Air outlet and inlet
          • 40 Instrumentation
            • 40.1 Draft
            • 40.2 Fuel input
            • 40.3 Power measurement
            • 40.4 Speed measurement
            • 40.5 Static pressure
            • 40.6 Temperature measurement
          • 41 Initial Test Conditions
            • 41.1 General
            • 41.2 Furnace equipped with mechanical atomizing burner
            • 41.3 Furnace equipped with vaporizing burner
            • 41.4 Static pressures for tests
          • 42 Combustion Test – Burner and Furnace
          • 43 Operation Tests
          • 44 Limit Control Cutout Test
          • 45 Continuity of Operation Test
          • 46 Airflow, Downflow or Horizontal Furnace Test
          • 47 Temperature Tests
            • 47.1 General
          • 48 Continuous Operation Test
          • 49 Blocked Inlet Test
          • 50 Fan Failure Test
          • 51 Stalled Fan Motor Test
          • 52 Blocked Outlet Test
          • 53 Short-Circuit Test
          • 54 Overload Test, High-Voltage Transformers
          • 55 Burnout Test, High-Voltage Transformers
          • 56 Dielectric Voltage-Withstand Test
          • 57 Flammability Test
          • MANUFACTURING AND PRODUCTION TESTS
          • 58 General
          • 59 Production Line Dielectric Voltage-Withstand Test
          • MARKING
          • 60 General
          • INSTRUCTIONS
          • 61 Operating and Installation Instructions
        • PART 2 – OUTDOOR-USE EQUIPMENT
          • CONSTRUCTION
          • 62 General
          • 63 Enclosure
            • 63.1 General
            • 63.2 Corrosion protection
          • 64 Field-Wiring Connections
          • 65 Internal Wiring
          • 66 Electrical Insulating Material
          • PERFORMANCE
          • 67 Rain Test
          • 68 Wind Test
          • 69 Accelerated Aging Test – Gaskets, Adhesives, and Sealing Compounds
          • 70 Metallic Coating Thickness Test
          • MARKING
          • 71 General
    • APPENDIX A