1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDECEMBER 8, 20171UL 724Outline of Investigation for Indirect Fired, Oil Burning Commercial CookingAppliancesIssue Number: 2December 8, 2017Summary of TopicsThis New Issue of the Outline of Invest
2、igation for Indirect Fired, OilBurning Commercial Cooking Appliances, UL 724. This new issueincludes editorial updates.ULs Outlines of Investigation are copyrighted by UL LLC. Neither a printed norelectronic copy of an Outline of Investigation should be altered in any way. All ofULs Outlines of Inve
3、stigation and all copyrights, ownerships, and rights regardingthose Outlines of Investigation shall remain the sole and exclusive property of ULLLC.COPYRIGHT 2017 UL LLCUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDECEMBER 8, 2017UL 7242No
4、Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .62 Components 63 Units of Measurement .74 Undated References 75 Glossary .7CONSTRUCTION MECHANICAL6 Assembly .117 Servicing 147.1 General 147.2 Movin
5、g parts 148 Base .159 Casings .1510 Radiation Shields .1611 Combustion Chambers 1612 Heating Surface Joints 1613 Baffles.1814 Flue Collars 1815 Dampers and Draft Regulators .1816 Air Intake Terminals .1917 Direct Vent (Vent-Air Intake Assemblies) 20CONSTRUCTION ELECTRICAL18 Cord Connected Appliances
6、 2118.1 Power supply cords .2118.2 Bushings 2118.3 Strain and push back relief 2219 Controls .2219.1 Application 2219.2 Limit control oil fired fryers .2319.3 Thermostats .2419.4 Liquid level controls 2520 Field Wiring 2520.1 General .2520.2 Leads and terminals 2621 Internal Wiring 2821.1 General .2
7、821.2 Methods 2821.3 Short circuit protection 3122 Separation of Circuits .3223 Grounding .3324 Electrical Components .3725 Mounting of Electrical Components .3726 Electrical Enclosures 3826.1 General .3826.2 Electrical enclosure access panels and covers .46DECEMBER 8, 2017 UL 724 3UL COPYRIGHTED MA
8、TERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL27 Motors and Motor Overload Protection 4727.1 General .4727.2 Motor overload protection .5028 Overcurrent Protection of High-Voltage Control-Circuit Conductors .5328.1 General .5328.2 Direct-connected high-volta
9、ge control circuit .5328.3 Tapped high-voltage control circuits 5328.4 Overcurrent-protective devices .5429 Overcurrent Protection of Transformers 5529.1 High-voltage transformers .5529.2 Low-voltage transformers 5630 Switches and Controllers 5631 Electrical Insulating Material 5732 Spacings High-Vo
10、ltage Circuit 5733 Spacings Low-Voltage Circuits 58PERFORMANCE34 General 5935 Test Installation for Floor Mounting .5936 Instrumentation .6536.1 Flue draft 6536.2 Fuel input .6536.3 Power measurement 6536.4 Speed measurement .6536.5 Temperature measurement 6637 Initial Test Conditions .6637.1 Genera
11、l .6638 Combustion Test .6739 Combustion Air Failure Test 6840 Burner Operating Characteristics .6941 Direct Acting Thermostat Calibration Tests .6941.1 Ovens 6941.2 Fryers 7041.3 Water filled cooking appliances 7042 Limit Control Test Oil-Fired Fryers 7143 Temperature Tests 7143.1 General .7144 Con
12、tinuous Operation Test .7445 Fan Failure 7646 Door Relief .7647 Strain Relief and Push Back Relief Tests 7747.1 Strain relief 7747.2 Push back relief 7748 Ground Continuity Test 7749 Leakage Current Test Cord Connected Appliances Only .7850 Stability 7851 Structural Integrity Overall Appliance 7952
13、Structural Integrity Food Supports, Shelves, Storage/Warming Areas 7953 Structural Integrity Drop Doors 8054 Structural Integrity Nonmetallic Covers, Guards, Panels, and Windows 8055 Transformer Burnout Test 8056 Short-Circuit Test 81DECEMBER 8, 2017UL 7244UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR
14、FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL57 Dielectric Voltage-Withstand Test .8358 Direct Vent Appliance Tests 84MANUFACTURING AND PRODUCTION TESTS59 General 8460 Production Line Dielectric Voltage-Withstand Test 8561 Grounding Continuity .87MARKING62 General 87INSTRUCTIONS63 O
15、perating and Installation Instructions .91DECEMBER 8, 2017 UL 724 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements cover indirect fired oil-burning floor-supported food service equipment equippedwith a
16、n oil burner providing coverage for griddles, baking and roasting ovens, deep fat fryers, and kettles,hereinafter referred to as “appliances,” constructed entirely of new, unused parts and materials for use infood service centers of commercial, industrial, institutional and public assembly buildings
17、.1.2 These requirements cover appliances intended to burn standard Grades No. 1 and 2 fuel oils asspecified in the Specification for Fuel Oils, ASTM D396, and standard Grades No. 1 and 2 diesel fuels asspecified in the Specification for Diesel Fuel Oils, ASTM D975.1.3 The oil-burning equipment cover
18、ed by these requirements are intended for installation in accordancewith the National Fire Protection Association Standard for Installation of Oil-Burning Equipment, NFPA 31,the International Mechanical Code, and the Uniform Mechanical Code.1.4 Appliances generating steam, at pressures above atmosph
19、eric, for cooking purposes are not coveredby these requirements.2 Components2.1 Except as indicated in 2.2, a component of a product covered by this outline shall comply with therequirements for that component. See the individual sections of this Outline of Investigation for componentrequirements.2.
20、2 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 theproduct covered by this outline, orb) Is superseded by a requirement in this outline.2.3 A component shall be used in accordance wit
21、h its rating established for the intended conditions ofuse.2.4 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 notexceeding specified limits, and sha
22、ll be used only under those specific conditions.DECEMBER 8, 2017UL 7246UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3 Units of Measurement3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapp
23、roximate information.4 Undated References4.1 Any undated reference to a code or standard appearing in the requirements of this outline shall beinterpreted as referring to the latest edition of that code or standard.5 Glossary5.1 For the purpose of this standard the following definitions apply.5.2 AI
24、R SHUTTER An adjustable device for varying the size of the air inlet or inlets regulating primaryand/or secondary air.5.3 APPLIANCE Refers to any equipment covered by these requirements unless specifically notedotherwise.5.4 APPLIANCE FLUE The flue passages within the appliance.5.5 AUTOMATICALLY LIG
25、HTED APPLIANCE An appliance in which fuel to the main burner is turnedon and ignited automatically.5.6 BASE The lowest supporting frame or structure of the appliance, exclusive of legs.5.7 BODY The principal structure of the appliance, including the supporting frame, which gives strengthand rigidity
26、 to the appliance.5.8 BURNER BOX The surfaces immediately surrounding a burner.5.9 BURNER, MECHANICAL-ATOMIZING TYPE A power-operated burner that prepares and deliversthe oil and all or part of the air by mechanical process in controllable quantities for combustion. Someexamples are air and steam at
27、omizing, high and low pressure atomizing, burners.5.10 CASING An enclosure forming the outside of the appliance, no parts of which are likely to besubjected to intense heat.5.11 COMBUSTIBLE MATERIAL Combustible material as pertaining to materials adjacent to or incontact with heat-producing applianc
28、es, chimney connectors and vent connectors, refers to material madeof or surfaced with wood, compressed paper, plant fibers, or other material that will ignite and burn. Suchmaterial shall be considered as combustible even though flameproofed, fire-retardant treated, orplastered.5.12 COMBUSTION CHAM
29、BER The portion of an appliance within which combustion occurs.DECEMBER 8, 2017 UL 724 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5.13 CONTROL, LIMIT As it pertains to this standard, a safety control responsive to changes intemperature n
30、ormally set beyond the intended operating range of the appliance to limit its operation.5.14 CONTROL, PRIMARY SAFETY The automatic safety control intended to reduce the risk ofabnormal discharge of oil at the burner in case of ignition failure or flame failure.5.15 CONTROL, SAFETY Automatic controls
31、, including relays, switches, and other auxiliary equipmentused in conjunction therewith to form a safety control system, that are intended to reduce the risk ofimproper operation of the appliance.5.16 CONTROL, SAFETY COMBUSTION See Control, Primary Safety.5.17 COOKING VESSEL The liquid container in
32、 which the cooking process is conducted.5.18 DEEP FAT FRYER, FOOD SERVICE An appliance including a cooking vessel in which oils or fatsare placed to such a depth that the cooking food is essentially supported by displacement of the cookingfluid or a perforated container immersed in the cooking fluid
33、 rather than by the bottom of the vessel. Forthe purpose of this standard, a deep fat fryer shall be limited to a capacity of 300 lb or less of cooking oilas determined by the manufacturers rating, and shall be designed primarily for use in hotels, restaurants,clubs and similar institutions.5.19 DRA
34、FT REGULATOR, BAROMETRIC (AUTOMATIC DAMPER) A device that functions tomaintain a desired draft in the appliance by automatically reducing excess chimney draft to the desiredvalue.5.20 ELECTRICAL CIRCUITS a) High-Voltage Circuit A circuit involving a potential of not more than 600 volts and havingcir
35、cuit 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 rms alternating-current (42.4 volts peak) or direct current and supplied by:1) A Class 2 transformer, or by a battery, by a battery and fixed impedance, o
36、r by atransformer and fixed impedance each of which, as a unit is in compliance with what isrequired for a Class 2 transformer; or2) Is limited to a maximum of 100 volt-amperes.A circuit derived from a source of supply classified as a high-voltage circuit, by connectingresistance in series with the
37、supply circuit as a means of limiting the voltage and current, is notconsidered to be a low-voltage circuit.c) Isolated Limited Secondary Circuit A circuit of limited energy derived from an isolatedsecondary winding of a transformer having a maximum capacity of 100 volt-amperes and open-circuit seco
38、ndary voltage rating not exceeding 1000 volts.d) Safety Control Circuit A circuit involving one or more safety controls.DECEMBER 8, 2017UL 7248UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5.21 ELECTRICAL ENCLOSURE The part of the appliance
39、that surrounds insulated and uninsulatedcurrent-carrying live parts and that is intended to contain a fire resulting from an electrical fault.5.22 GRIDDLE An appliance having a cooking surface which transfers heat directly to a food productthrough convection or conduction.5.23 INDIRECT-FIRED APPLIAN
40、CE An appliance constructed so that combustion products or fluegases are not mixed in the appliance with the medium, that is, to be heated; hence is provided with a fluecollar.5.24 INDIRECT OVEN THERMOSTAT SYSTEM A control system of two or more integrated automaticdevices to maintain an oven tempera
41、ture as selected by the operator. That portion of the systemresponsive to oven temperature causes operation of another portion of the system to turn on or shut offthe oil supply to the oven burner.5.25 INTENDED OPERATION Normal operation of the appliance where the fire, shock, and mechanicalhazards
42、are mitigated.5.26 KETTLE An appliance with a cooking chamber which is heated either by a steam jacket in whichsteam is generated by fuel heat or by direct fuel heat applied to the cooking chamber.5.27 NON-COMBUSTIBLE MATERIAL Non-combustible material as pertaining to materials adjacent toor in cont
43、act with heat-producing appliances, chimney connectors and vent connectors, refers to materialsthat will not ignite and burn.5.28 NORMAL CARE The periodic tasks usually performed to operate and maintain an appliance, suchas air, fuel, pressure, and temperature regulation, cleaning, lubrication, and
44、resetting of controls. Repairand replacement of parts other than those expected to be renewed periodically is not considered to beservicing. Some examples of servicing are:a) Cleaning or replacing nozzles, atomizers, and pilots.b) Setting ignition electrodes.c) Cleaning strainers or replacing strain
45、er or filter element.d) Resetting safety control.e) Replacing igniter cable.5.29 OVEN, BAKING AND ROASTING An oven primarily intended for volume food preparation whichcan be composed of one or more sections or units of the following types:a) Cabinet Oven. An oven having one or more cavities heated b
46、y a single burner or group ofburners.b) Reel-Type Oven. An oven employing trays that are moved by mechanical means.c) Sectional Oven. An oven composed of one or more independently heated cavities.DECEMBER 8, 2017 UL 724 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION
47、WITHOUT PERMISSION FROM UL5.30 OVEN, INDIRECT An enclosed compartment in which cooking is accomplished primarily byconvected heat in which the flue gases do not flow through the oven compartment.5.31 POSTPURGE PERIOD The period of time after the fuel delivered to the burner is stopped andduring whic
48、h the burner motor or fan continues to run to supply air to the combustion chamber.5.32 PREPURGE PERIOD The period of time during the burner start-up in which air is introduced intothe combustion chamber and the associated flue passages in such volume and manner as to completelyreplace the air or fu
49、el-air mixture contained therein prior to initiating ignition.5.33 PRIMARY AIR The air introduced into a burner and which mixes with the fuel before it reachesthe ignition zone.5.34 READILY ACCESSIBLE Capable of being reached easily and quickly for operation, adjustment,and inspection.5.35 SAFETY SHUTDOWN (LOCKOUT) The shutting off of all fuel and ignition energy to the burner bymeans of a safety control or controls so that restart cannot be accomplished without manual reset.5.36 SEC
