UL 732
Standard for Oil-Fired Storage Tank Water Heaters

DETAILS
Edition Number:6SCC Approved:--
Edition Date:2018-01-31DOD Approved: --
Price Code:AANSI Approved: 2018-08-09
Type:ulstd

  • SCOPE

    1 Scope

    1.1 These requirements cover oil-fired storage-tank water-heating appliances having a fuel input of not more than 200,000 Btu per hour (60 kW). These requirements do not apply to heaters that include storage vessels having a water capacity of more than 120 gallons (454.2 liters), or that are intended for heating water to a temperature of more than 200°F (93.3°C).

    1.2 The oil-burning equipment covered by these requirements are intended for installation in accordance with the National Fire Protection Association Standard for the Installation of Oil Burning Equipment, NFPA 31, the International Mechanical Code and the Uniform Mechanical Code.

  • TABLE OF CONTENTS
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    • Cover
    • Transmittal
    • Table of Contents
      • Body
        • INTRODUCTION
          • 1 Scope
          • 2 Glossary
          • 3 Units of Measurement
          • 4 Components
        • CONSTRUCTION
          • 5 Assembly
          • 6 Accessibility for Servicing
          • 7 Base
          • 8 Casing
          • 9 Radiation Shields
          • 10 Insulation Materials
          • 11 Combustion Chamber
          • 12 Heating Surface Joints
          • 13 Baffles
          • 14 Flue Collars
          • 15 Damper and Draft Regulator
          • 16 Materials Contacting Water
          • 17 Water-Storage Vessels
          • 18 Dip Tubes
          • 19 Controls
            • 19.1 Application
            • 19.2 Limit control
            • 19.3 Water-temperature regulating control
          • 20 Field Wiring
          • 21 Internal Wiring
          • 22 Separation of Circuits
          • 23 Bonding for Grounding
        • ELECTRICAL COMPONENTS
          • 24 General
          • 25 Mounting of Electrical Components
          • 26 Electrical Enclosures
          • 27 Accessibility of Uninsulated Live Parts, Film-Coated Wire and Moving Parts
          • 28 Motors and Motor Protection
          • 29 Switches and Controllers
          • 30 Capacitors
          • 31 Electrical Insulating Material
          • 32 Spacings – High-Voltage Circuits
          • 33 Spacings – Low-Voltage Circuits
          • 34 Protection of Users and Service Personnel
        • PERFORMANCE
          • 35 General
          • 36 Test Installation for Other Than Alcove-or Closet-Installed Heaters
            • 36.1 Enclosure
            • 36.2 Chimney connector
          • 37 Test Installation for Alcove-or Closet-Installed Units
            • 37.1 Enclosure
            • 37.2 Chimney connector
          • 38 Instrumentation
            • 38.1 Draft measurement
            • 38.2 Fuel-input measurement
            • 38.3 Power measurement
            • 38.4 Speed measurement
            • 38.5 Temperature measurement
          • 39 Initial Test Conditions
            • 39.1 General
            • 39.2 Heater equipped with mechanical atomizing burner
            • 39.3 Heater equipped with vaporizing burner
          • 40 Combustion Test – Burner and Water Heater
          • 41 Water-Temperature Control Test
          • 42 Limit-Control Cutout Test
          • 43 Temperature Test
          • 44 Seepage and Burnoff Test – Vaporizing Burner
          • 45 Hydrostatic Test on Water-Storage Vessels
          • 46 Short-Circuit Test
          • 47 Dielectric Voltage-Withstand Test
          • 48 Torque Test on Screws and Bolts
          • 49 Securement Tests on Constant-Level Valve Assemblies
          • 50 Bonding-Conductor Test
          • 51 Strain-Relief Test
          • 52 Nonmetallic Dip Tube Tests
            • 52.1 Deformation and weight loss
            • 52.2 Resistance to crushing
            • 52.3 Collapse
        • MANUFACTURING AND PRODUCTION TESTS
          • 53 General
        • MARKING
          • 54 General
        • INSTALLATION INSTRUCTIONS
          • 55 General
    • APPENDIX A