UL 307A
Standard for Liquid Fuel-Burning Heating Appliances for Manufactured Homes and Recreational Vehicles

DETAILS
Edition Number:9SCC Approved:--
Edition Date:2018-07-24DOD Approved: --
Price Code:DANSI Approved: 2018-10-08
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements apply to the following types of liquid fuel-burning appliances intended for installation in manufactured homes and recreational vehicles, including travel trailers, camping trailers, truck campers, motor homes, and park trailers.

    a) Direct vent system type heating appliances that provide for complete separation between the indoor atmosphere and combustion system, including the air supplied for combustion by inherent design of the furnace and its venting system.

    b) Vented heating appliances other than of the direct vent system type that provide for separation between the indoor atmosphere and combustion system, including the air supplied for combustion by an installation method. Such appliances can be used only in manufactured homes, not in recreational vehicles.

    1.2 Requirements for the installation and use of these appliances are included in the following standards:

    a) For Manufactured Homes – The Department of Housing and Urban Development Manufactured Home Construction and Safety Standards, Title 24 CFR, Part 3280, 1994.

    b) For Recreational Vehicles – The National Fire Protection Association Standard for Fire Safety Criteria for Recreational Vehicles, NFPA 501C-1993.

    1.3 An appliance constructed to burn liquid fuel or gas and a liquid fuel burning appliance constructed and designed so that it may be converted to burn gas by installation of a specific gas burner shall also comply with the applicable requirements in the Standard for Gas-Burning Heating Appliances For Manufactured Homes and Recreational Vehicles, UL 307B.

    1.4 The term "appliance" as used in this standard refers to any heating appliance covered by this standard, such as a warm air central furnace, a wall furnace, a heating boiler, and a water heater.

  • TABLE OF CONTENTS
    Expand All

    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Components
          • 3 Units of Measurement
          • 4 Glossary
        • CONSTRUCTION – ALL APPLIANCES
          • 5 Materials
          • 6 Assembly
          • 7 Accessibility for Servicing
          • 8 Burner Equipment
          • 9 Air-Intake Assemblies
          • 10 Base
          • 11 Drip Pan or Tray
          • 12 Casing
          • 13 Radiation Shields
          • 14 Materials In Air Handling Compartments
            • 14.1 General
            • 14.2 Air filters
          • 15 Combustion Chamber
          • 16 Radiator
          • 17 Heating-Surface Joints
          • 18 Baffles
          • 19 Flue Collar
          • 20 Flue-Gas Outlet Assembly
          • 21 Control Circuits
          • 22 Controls
            • 22.1 Application
            • 22.2 Combustion air control
            • 22.3 Limit control
            • 22.4 Primary safety control
        • WIRING METHODS – ALL APPLIANCES
          • 23 Field Wiring
            • 23.1 General
            • 23.2 Grounding
            • 23.3 Cord connected appliances
          • 24 Factory Wiring
          • 25 Separation of Circuits
          • 26 Bonding for Grounding
        • ELECTRICAL COMPONENTS – ALL APPLIANCES
          • 27 General
          • 28 Mounting of Electrical Components
          • 29 Electrical Enclosures
          • 30 Motors and Motor Overload Protection
          • 31 Capacitors
          • 32 Electrical Insulating Material
          • 33 Switches and Controllers
        • SPACINGS – ALL APPLIANCES
          • 34 High-Voltage Circuits
          • 35 Low-Voltage Circuits
        • PROTECTION OF USERS AND SERVICE PERSONNEL – ALL APPLIANCES
          • 36 General
        • CONSTRUCTION – SPECIFIC APPLIANCES
          • 37 Central Furnaces
          • 38 Heating Boilers
          • 39 Water Heaters
            • 39.1 Temperature-regulating control
            • 39.2 Limit control
            • 39.3 Water storage vessels
            • 39.4 Materials contacting water
            • 39.5 Dip tubes
        • PERFORMANCE – ALL APPLIANCES
          • 40 General
          • 41 Flammability Test
          • 42 Test Installation – Corner Location
          • 43 Test Installation – Upflow, Downflow, and Horizontal Furnaces for Alcove or Closet Location
          • 44 Supply and Return Ducts – Forced-Air Appliances
          • 45 Test Installation – Heating Boilers and Water Heaters
          • 46 Flue-Gas Outlet Assembly
          • 47 Instrumentation
            • 47.1 Draft measurement
            • 47.2 Fuel input measurement
            • 47.3 Power measurement
            • 47.4 Speed measurement
            • 47.5 Static pressure measurement
            • 47.6 Temperature measurement
          • 48 Initial Test Conditions
            • 48.1 General
            • 48.2 Static pressure for tests
          • 49 Combustion Test – Burner and Appliance
          • 50 Operation Tests
          • 51 Limit-Control Cutout Test – Warm-Air Appliances and Boilers
          • 52 Water-Heater Temperature Control Test
          • 53 Limit-Control Cutout Test – Water Heater
          • 54 Continuity of Operation Test– Warm-Air Appliances
          • 55 Temperature Test
          • 56 Continuous Operation Temperature Test – Central Heating Appliances
          • 57 Continuous Operation Temperature Test – Water Heaters
          • 58 Blocked Register Temperature Test
          • 59 Blocked Outlet Temperature Test
          • 60 Blocked Inlet Temperature Test
          • 61 Fan Failure Temperature Test
          • 62 Stalled Fan Motor Temperature Test
          • 63 Air Flow Test – Horizontal Appliances
          • 64 Seepage and Burnoff Temperature Tests
          • 65 Direct Vent System Leakage Test
          • 66 Short Circuit Test
          • 67 Dielectric Voltage Withstand Test
          • 68 Nonmetallic Dip Tube Tests
            • 68.1 Deformation and weight loss
            • 68.2 Resistance to crushing
            • 68.3 Collapse
          • 69 Strain-Relief Test
          • 70 Leakage-Current Test
        • MANUFACTURING AND PRODUCTION TESTS – ALL APPLIANCES
          • 71 General
          • 72 Production-Line Grounding Continuity Test
        • MARKING – ALL APPLIANCES
          • 73 General
        • CONSTRUCTION – OUTDOOR USE EQUIPMENT
          • 74 General
          • 75 Enclosure
            • 75.1 General
            • 75.2 Corrosion protection
          • 76 Field-Wiring Connections
          • 77 Wiring
          • 78 Electrical Insulating Material
        • PERFORMANCE – OUTDOOR USE EQUIPMENT
          • 79 Rain Test
          • 80 Gaskets
          • 81 Metallic Coating Thickness Test
        • MARKING – OUTDOOR USE EQUIPMENT
          • 82 General
          • 83 Instructions
    • APPENDIX A