UL 307B
Standard for Gas-Burning Heating Appliances For Manufactured Homes and Recreational Vehicles

DETAILS
Edition Number:5SCC Approved:--
Edition Date:2006-10-31DOD Approved: --
Price Code:CANSI Approved: --
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements apply to the following gas fuel-burning heating appliances:

    a)    Direct-vent system appliances for manufactured homes and recreational vehicles; and

    b)    Vented appliances for manufactured homes other than the direct-vent system type that provide for separation of the combustion system from the atmosphere of the manufactured home by an installation method.

    1.2 Requirements for the installation and use of heating appliances in manufactured homes and recreational vehicles are included in:

    a)     The Department of Housing and Urban Development Manufactured Home Construction and Safety Standards, Chapter II of 24 CFR, Part 3280-1994 ; and

    b)    The Standard for Recreational Vehicles, NFPA 501C-1993.

    1.3 An appliance designed to burn either oil or gas, and a gas appliance designed to be converted to burn oil by the installation of an optional factory-furnished burner, shall also comply with the requirements in the Standard for Liquid Fuel-Burning Heating Appliances for Manufactured Homes and Recreational Vehicles, UL 307A.

    1.4 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this Standard, and that involve a risk of fire, electric shock, or injury to persons shall be evaluated using the appropriate additional component and end-product requirements as determined necessary to maintain the acceptable level of safety as originally anticipated by the intent of this Standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this Standard cannot be judged to comply with this Standard. Where considered appropriate, revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this Standard.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 General
            • 2.1 Components
            • 2.2 Units of measurement
            • 2.3 Terminology
          • 3 Glossary
        • CONSTRUCTION
          • GENERAL
          • 4 Assembly
          • 5 Accessibility for Servicing
          • 6 Air-Intake Assemblies
          • 7 Base
            • 7.1 General
            • 7.2 Warm air appliances
          • 8 Casing
          • 9 Radiation Shields
          • 10 Combustion Chamber
          • 11 Radiator
          • 12 Heating-Surface Joints
          • 13 Baffles
            • 13.1 General
            • 13.2 Water heaters
          • 14 Flue Collar
          • 15 Flue-Gas Outlet Assembly
          • 16 Draft Hoods
          • 17 Warm Air Appliance Air Handling System
          • 18 Warm Air Handling System for Installation Downstream From a Cooling System
          • 19 Materials In Air Handling Compartments of Warm Air Appliance
            • 19.1 General
            • 19.2 Air filters
          • 20 Water Heater Storage Vessels
          • 21 Water Heater Dip Tubes
          • BURNER EQUIPMENT AND CONTROLS
          • 22 General
          • 23 Gas Piping, Tubing, And Fittings
          • 24 Main Burner and Flame Spreaders
          • 25 Combustion Air Supply and Control
            • 25.1 General
            • 25.2 Air shutters
            • 25.3 Combustion air dampers
          • 26 Orifice Spuds and Orifice Fittings
          • 27 Manual Valves
          • 28 Gas Appliance Pressure Regulators
          • 29 Gas Bleeds and Vents
          • 30 Pilot Gas Filters
          • 31 Control Circuits
          • 32 Controls
            • 32.1 General
            • 32.2 Warm air appliance limit control
            • 32.3 Warm air appliance fan control
            • 32.4 Boiler limit control
            • 32.5 Water heater limit control
            • 32.6 Water heater temperature regulating control
          • 33 Automatic Gas Valves
          • 34 Automatic Gas Ignition Systems
          • WIRING METHODS
          • 35 Field Wiring
            • 35.1 General
            • 35.2 Grounding
            • 35.3 Cord-connected appliances
          • 36 Factory Wiring
          • 37 Electrical Systems Rated 12 Volt DC
          • 38 Separation of Circuits
          • 39 Bonding for Grounding
          • ELECTRICAL COMPONENTS
          • 40 General
          • 41 Electrical Enclosures
            • 41.1 General
            • 41.2 Doors and covers
            • 41.3 Field wiring system connections
          • 42 Motors and Motor Overload Protection
          • 43 Capacitors
          • 44 Electrical Insulating Material
          • 45 Switches and Controllers
          • SPACINGS
          • 46 High-Voltage Circuits
          • 47 Low-Voltage Circuits
          • PROTECTION OF USERS AND SERVICE PERSONNEL
          • 48 General
        • PERFORMANCE
          • GENERAL
          • 49 General
          • 50 Instrumentation
            • 50.1 Draft measurement
            • 50.2 Fuel input measurement
            • 50.3 Power measurement
            • 50.4 Speed measurement
            • 50.5 Static pressure measurement
            • 50.6 Temperature measurement
            • 50.7 Warm air appliances
            • 50.8 Boilers
            • 50.9 Water heater
          • DUCT-CONNECTED APPLIANCE TEST INSTALLATION
          • 51 General
          • 52 Corner Installation For Central Furnaces
          • 53 Alcove or Closet Installation for Appliance Furnaces
          • 54 Wall Furnace Installation
          • 55 Recessed Furnace Installation
          • BOILER AND WATER HEATER TEST INSTALLATION
          • 56 General
          • FLUE-GAS OUTLET ASSEMBLY
          • 57 General
          • INITIAL TEST CONDITIONS, TEST PRESSURES, AND BURNER ADJUSTMENTS
          • 58 Initial Test Conditions
            • 58.1 General
            • 58.2 Warm air appliance
          • 59 Test Pressures and Burner Adjustments
          • APPLIANCE TESTS
          • 60 Combustion – Burner and Appliance
          • 61 Burner Operating Characteristics
            • 61.1 Flash back
            • 61.2 Back pressure
            • 61.3 Flame extinguishment-water heaters
          • 62 Pilot Operating Characteristics
            • 62.1 Ignition
            • 62.2 Flame travel
            • 62.3 Protection from drafts
            • 62.4 Carbon deposits
            • 62.5 Automatic relight pilot system
          • 63 Operation of Pilot Actuated Safety Shutoff Devices
            • 63.1 Pilot flame establishing period
            • 63.2 Shutoff time
            • 63.3 Nonautomatic shutoff
          • 64 Direct Ignition Tests
            • 64.1 General
            • 64.2 Ignition time
            • 64.3 Flame failure
            • 64.4 Venting
          • 65 Temperature Test
          • 66 Wind Test
            • 66.1 General
            • 66.2 Main burners
            • 66.3 Carbon monoxide
            • 66.4 Operating characteristics
            • 66.5 Carbon dioxide
            • 66.6 Water heater tests
          • 67 Direct Vent System Leakage Test
          • 68 Field Wiring Strain Relief Test
          • 69 Short-Circuit Test
            • 69.1 Test no. 1
            • 69.2 Test no. 2
            • 69.3 Motor circuits
          • 70 Dielectric Voltage-Withstand Test
          • WARM AIR APPLIANCE TESTS
          • 71 Limit-Control Cutout Test
          • 72 Continuity of Operation Test
          • 73 Continuous Operation Temperature Test
          • 74 Blocked Register Temperature Test
          • 75 Blocked Outlet Temperature Test
          • 76 Blocked Inlet Temperature Test
          • 77 Fan Failure Temperature Test
          • 78 Stalled Fan Motor Temperature Test
          • 79 Heating Element Endurance Test
          • 80 Horizontal Central Furnace Air Flow Test
          • 81 Condensate Test
          • 82 Surface Temperature Test
          • 83 Ignition of Flammable Fabric and Related Hazards Test
          • BOILER TESTS
          • 84 Limit Control Cutout Test
          • 85 Low Water Level Control Cutout Test
          • 86 Continuous Operation Temperature Test
          • WATER HEATER TESTS
          • 87 Water Temperature Control Test
          • 88 Thermostat Control Test
          • 89 Limit-Control Cutout Test
          • 90 Continuous Operation Temperature Test
          • 91 Burner Durability Test
          • 92 Blocked Flue Test
          • 93 Draft Hoods
            • 93.1 Blocked draft hood
            • 93.2 Downdraft – I
            • 93.3 Downdraft – II
            • 93.4 Static load
            • 93.5 Flue gases – I
            • 93.6 Flue gases – II
            • 93.7 Smoke leakage
          • 94 Vent System Leakage Test
          • 95 Nonmetallic Dip Tube Tests
            • 95.1 Deformation and weight loss
            • 95.2 Resistance to crushing
            • 95.3 Collapse
          • 96 Hydrostatic Pressure Test
          • 97 Strain-Relief Test
          • 98 Leakage-Current Test
          • MANUFACTURING AND PRODUCTION TESTS
          • 99 General
          • 100 Production-Line Grounding Continuity Test
        • MARKING AND INSTRUCTIONS
          • 101 General
          • 102 Warm Air Appliance
          • 103 Water Heater
          • 104 Instructions
            • 104.1 All appliances
            • 104.2 Instructions for central furnaces
            • 104.3 Instructions for water heaters
        • OUTDOOR USE EQUIPMENT CONSTRUCTION
          • 105 General
          • 106 Enclosure
            • 106.1 General
            • 106.2 Corrosion protection
          • 107 Field-Wiring Connections
          • 108 Wiring
          • 109 Electrical Insulating Materials
        • PERFORMANCE
          • 110 Rain Test
            • 110.1 General
            • 110.2 Vents
          • 111 Gaskets
          • 112 Metallic Coating Thickness Test
        • MARKING
          • 113 General
    • APPENDIX A
    • APPENDIX B