UL 733-2019 pdf download

UL 733-2019 pdf download.Oil-Fired Air Heaters and Oil-Fired Direct-Fired Heaters.
1 Scope 1.1 These requirements apply to oil-fired air heaters and oil fired direct-fired heaters. 1.2 Requirements for the installation and use of oil-burning equipment are included in the Standard for the Installation of Oil-Burning Equipment, NFPA 31. 1.3 This standard is not intended for permanently installed heaters. 2 General 2.1 The term “appliance” refers to any equipment covered by this Standard. 2.2 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 2.3 Except as indicated in 2.4, a component of a product covered by this standard shall comply with the requirements for that component. See Appendix A for a list of standards covering components generally used in the products covered by this standard. 2.4 A component is not required to comply with a specific requirement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.5 A component shall be used in accordance with its rating established for the intended conditions of use. 2.6 Specific components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specified limits, and shall be used only under those specific conditions.
5.3 AIR SHUTTER – An adjustable device for varying the size of the air inlet or inlets regulating primary and/or secondary air. 5.4 ANTIFLOODING DEVICE – A primary safety control which causes the fuel flow to be shut off upon a rise in fuel level or upon receiving excess fuel, and which operates before the hazardous discharge of fuel can occur. 5.5 APPLIANCE FLUE – The flue passages with in the appliance. 5.6 AUTOMATICALLY LIGHTED APPLIANCE – An appliance in which fuel to the main burner is normally turned on and ignited automatically. 5.7 BAFFLE – An object placed in an appliance to direct the flow of air or flue gases. 5.8 BURNER, MECHANICAL-ATOMIZING TYPE – A power-operated burner which prepares and delivers the oil and all or part of the air by mechanical process in controllable quantities for combustion. Some examples are air atomizing, high and low pressure atomizing, horizontal rotary, vertical rotary atomizing, and vertical rotary wall-flame burners. 5.9 BURNER, MECHANICAL DRAFT TYPE – A burner which includes a power-drive fan, blower, or other mechanism as the principal means for supplying air for combustion. 5.10 BURNER, NATURAL DRAFT TYPE – A burner which depends principally upon the natural draft created in the flue to induce into the burner the air required for combustion. 5.11 BURNER, VAPORIZING TYPE – A burner consisting of an oil-vaporizing bowl or other receptacle to which liquid fuel may be fed in controllable quantities; the heat of combustion being used to vaporize the fuel, with provision for admitting air and mixing it with the oil vapor in combustible proportions.
5.18 CONTROL, PRIMARY SAFETY – The automatic safety control intended to prevent abnormal discharge of oil at the burner in case of ignition failure of flame failure. 5.19 CONTROL, SAFETY COMBUSTION – A primary safety control responsive directly to flame properties; sensing the presence of flame and causing fuel to be shut off in event of flame failure. 5.20 DAMPER – A valve or plate for regulating draft or flow of flue gases. A damper is generally considered as being located on the downstream side of the combustion chamber, usually in a flue passage of the appliance or in the chimney connector. 5.21 DAMPER, AUTOMATICALLY OPERATED – A damper operated by an automatic control. 5.22 DAMPER, MANUALLY OPERATED – An adjustable damper manually set and locked in the desired position. 5.23 DIRECT-FIRED HEATER – A heater, equipped with one or more oil burners, safety controls, electrical equipment as needed, and related equipment, manufactured for assembly as a complete unit, in which combustion products or flue gases are mixed with the air being heated, such as a salamander. 5.24 DRAFT REGULATOR – A device which functions to maintain a desired draft in the appliance by automatically reducing the chimney draft to the desired value. 5.25 ELECTRICAL CIRCUITS: a) High-Voltage Circuit – A circuit involving a potential of not more than 600 volts and having circuit characteristics in excess of those of a low-voltage circuit; b) Low-Voltage Circuit – A circuit involving a potential of not more than 30 volts alternating-current (42.4 peak) or direct current and supplied by: 1) A Class 2 transformer, or by a battery, by a battery and fixed impedance, or by transformer and fixed impedance, each of which, as a unit is in compliance with what is required for a Class 2 transformer; or 2) Is limited to a maximum of 100 volt-amperes.UL 733-2019 pdf download.