1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOctober 14, 20131UL 762POWER ROOF VENTILATORS FOR RESTAURANT EXHAUST APPLIANCESISSUE NO: 7OCTOBER 14, 2013Summary of Topics:This revision of Subject 762 is being issued to in order to cover the d
2、uctfans of the straight-through type.The UL Foreword is no longer located within the UL Outline of Investigation. Forinformation concerning the use and application of the requirements contained inthis Outline of Investigation, the current version of the UL Foreword is located onULStandardsInfoNet at
3、: http:/ issue becomes effective October 14, 2013.COPYRIGHT 2013 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOCTOBER 14, 2013UL 7622No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPROD
4、UCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 General 43 Undated References 4CONSTRUCTION4 Assembly 45 Guarding of Moving Parts 56 Operation 57 Duct Connection 6PERFORMANCE8 Test Installation for Test No. 1 Normal Temperature Test 69 Temperature Measurement and Flue
5、-Gas Generator for Test No. 1 Normal Temperature Test .710 Test No. 1 Normal Temperature Test .810.1 Method .810.2 Requirements .911 Test Installation for Test No. 2 Abnormal Flare Up Test .1212 Temperature Measurement for Test No. 2 Abnormal Flare Up Test .1313 Test No. 2 Abnormal Flare Up Test .13
6、13.1 Method .1313.2 Requirements 1314 Test No. 3 Accelerated Air-Oven Aging Test .1314.1 General .1314.2 Apparatus .1414.3 Method .1415 Test No. 4 Immersion Tests of Gaskets and Seals 1515.1 General .1515.2 Apparatus .1615.3 Method .16INSTRUCTIONS16 Installation Instructions 17OCTOBER 14, 2013 UL 76
7、2 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements cover roof or wall-mounted ventilators and duct fans of the straight-through typefor restaurant exhaust appliances.1.2 Power ventilators for restauran
8、t exhaust appliances covered by these requirements are intended forinstallation in accordance with the Standard of the National Fire Protection Association for the Installationof Equipment for the Removal of Smoke and Grease-Laden Vapors from Commercial Cooking Equipment,NFPA 96.1.3 Power ventilator
9、s for restaurant appliances shall comply with the Standard for Power Ventilators, UL705, modified in that wiring system shall not be located in the path of travel of exhaust products.2 General2.1 A component of a power ventilator shall comply with the requirements for that component, except thatsuch
10、 requirements may be modified if appropriate for the particular application.2.2 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.3 Undated References3.1 Any undated reference to a code or standard appearing in the requirements of
11、this outline shall beinterpreted as referring to the latest edition of that code or standard.CONSTRUCTION4 Assembly4.1 A power ventilator shall include all the essential parts necessary for its normal function when installedas intended. The equipment may be shipped as subassemblies.4.2 All parts, co
12、ntrols, and safety devices requiring normal care shall be accessible. Parts in the assemblywhich are intended to be removed for normal care shall be of such design that their restoration, followingremoval, will not necessitate their realignment to secure their proper relationship with other parts of
13、 theassembly. Special tools or equipment required for normal maintenance by the operator shall accompanythe equipment to the user.4.3 The exhaust shall terminate a minimum of 40 inches (101.6 cm) above the roof line for roof mountedunits. A means shall be provided so that all interior surfaces of th
14、e ventilator exposed to the exhaustproducts can be reached and cleaned by hand without use of specialized tools.OCTOBER 14, 2013UL 7624UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5 Guarding of Moving Parts5.1 As stated in the Standard for
15、Exhaust Hoods for Commercial Cooking Equipment, UL 710, movingparts, such as a belt, coupling, fan, gear, pulley, shaft, etc. shall be enclosed or guarded.5.2 An opening in an enclosure for a moving part shall be of such size or shape or so situated that a rodof the diameter specified below is preve
16、nted from entering the opening:a) If the distance from the face of an opening to a moving part is 1/2 inch (12.7 mm) or less,the diameter of the rod shall be equivalent to the distance measured from a straight edgeplaced across the exterior face of the opening to be checked to the nearest moving par
17、t.b) If the exterior face of an opening is more than 1/2 inch (12.7 mm), but not more than 2inches (50.8 mm) from a moving part, the diameter of the rod shall be 33/64 inch (13.1 mm).c) If the exterior face of an opening is more than 2 inches (50.8 mm), but not more than 4inches (101.6 mm) from a mo
18、ving part, the diameter of the rod shall be 41/64 inch (16.3 mm).d) If the exterior face of an opening is more than 4 inches (101.6 mm), but not more than 6inches (152.4 mm) from a moving part, and the area of the opening is not more than 3 squareinches (19.4 cm2), the diameter of the rod shall be 4
19、9/64 inch (19.4 mm).e) If the exterior face of an opening is more than 6 inches (152.4 mm) from a moving part, thediameter of the rod shall be 1 inch (25.4 mm); except that if the area of the opening is not morethan 6 square inches (38.7 cm2), the diameter of the rod shall be 2 inches (50.8 mm).5.3
20、Conformance to the preceding paragraph is to be determined by attempting to insert a rod 3 inches(76.2 mm) long and of the specified diameter into the openings when the equipment is assembled.5.4 It shall not be necessary to remove a permanently attached guard to lubricate the equipment.6 Operation6
21、.1 A power ventilator shall be capable of delivering the manufacturers rated cubic feet per minute at hisrecommended static pressure and temperature. This rating information shall be marked on the ventilator.6.2 The ventilator shall be capable of delivering air at a minimum velocity of 500 feet per
22、minute (0.51cm/s) through its duct collar.OCTOBER 14, 2013 UL 762 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7 Duct Connection7.1 A means for connection of duct work shall be provided as part of the ventilator.7.2 The connection shall in
23、corporate stops on the interior surfaces if field-installed duct work mayinterfere with the operation of movable parts of the assembly.PERFORMANCE8 Test Installation for Test No. 1 Normal Temperature Test8.1 A representative sample of the style of ventilator to be installed in accordance with the ma
24、nufacturersinstructions.8.2 A straight duct 4 feet (1.22 m) long of the same size as the duct connection on the ventilator shall beattached to the ventilator. A bleeder damper shall be installed in the duct perpendicular to the main airflow to allow regulation of mixing air necessary for Test No. 1
25、Normal Temperature Test. See Figure8.1.This is generated text for figtxt.Figure 8.1Test installationOCTOBER 14, 2013UL 7626UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL9 Temperature Measurement and Flue-Gas Generator for Test No. 1 Normal T
26、emperature Test9.1 The inlet flue gas temperature is to be determined by a thermocouple grid located 6 inches from theventilator collar in a plane perpendicular to the air flow. The grid is made up of nine thermocouples ofidentical length wired in parallel. The duct is to be divided into nine equal
27、areas with a thermocouplelocated in the center of each of the areas. The thermocouples are to be Type J (iron-constantan) not largerthan 24 AWG. See Figure 9.1.This is generated text for figtxt.9.2 The gas generator illustrated by Figure 10.1 is to be connected to the test duct by transition section
28、of 2 feet (0.61 m); 2 feet represents the distance from the cooking surface to the inlet of the hood.9.3 The ambient or room temperature is to be determined by a shielded thermocouple located centrallywithin a 6-inch (152.4 mm) length of aluminum-painted 2-inch (50.8 mm) steel pipe open at both ends
29、,orientated vertically. The ambient temperature shall be measured at a distance 2 feet (0.61 m) from thenearest part of the ventilator and centered vertically in accordance with the height of the ventilator. If it isfound that at this location the thermocouple is in the hot air stream, it is to be m
30、oved out of the air streamin accordance with the intent of the standard.Figure 9.1Thermocouple gridOCTOBER 14, 2013 UL 762 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL10 Test No. 1 Normal Temperature Test10.1 Method10.1.1 A gas fired gene
31、rator (see Figure 10.1) is to be used to supply hot gases to a 4 foot (1.22 m) ductconnected to the power ventilator.This is generated text for figtxt.10.1.2 The generator is to be operated and test conditions are then to be established and maintained toproduce a minimum temperature in the duct of 3
32、00F (149C) or at a higher temperature specified by themanufacturer. The ventilator air flow for this temperature rise should be such as to maximize the load(current input) on the motor and can be attained by adjusting the gas firing rate of the generator. Theoperation is to be continued until equili
33、brium temperatures are attained on all electrical components. Atemperature is considered to be constant when three successive readings, taken at intervals of 10 percentof the previously elapsed duration of the test, but not less than 5 minute intervals, indicate no change. Thetest temperature shall
34、be marked on the ventilator as the maximum normal operating temperatures inservice.Figure 10.1Flue-gas generatorOCTOBER 14, 2013UL 7628UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL10.2 Requirements10.2.1 The maximum temperature obtained on
35、any portion of the ventilator shall not exceed the maximumspecified in Column 1 of Table 10.1. Parts of the ventilator shall not warp, deteriorate or become damagedto any extent which would cause unsafe operation.Table 10.1Maximum temperature risesDevice or MaterialColumn 1 Column 2Degrees DegreesC
36、F C FA. Motorsa,b1. Insulation systems on coil windings of alternating-current motors having aframe diameter of 7 inches (178 mm) or less (not including universal motors).a. Class A insulation systems(1) In open motors Thermocouple or resistance method 75 135 115 207(2) In totally enclosed motors Th
37、ermocouple or resistance method 80 144 115 207b. Class B insulation systems(1) In open motors Thermocouple or resistance method 95 171 140 252(2) In totally enclosed motors Thermocouple or resistance method 100 180 140 252c. Class F insulation systems(1) In open motors Thermocouple or resistance met
38、hod 120 216 150 270(2) In totally enclosed motors Thermocouple or resistance method 125 225 155 2792. Insulation systems on coil windings of alternating-current motors having aframe diameter of more than 7 inches (178 mm) and of direct-current motors anduniversal motors.a. Class A insulation systems
39、(1) In open motors Thermocouple method 65 117 115 207Resistance method 75 135 115 207(2) In totally enclosed systems Thermocouple method 70 126 115 207Resistance method 80 144 115 207b. Class B insulation systems(1) In open motors Thermocouple method 85 153 140 252Resistance method 95 171 140 252(2)
40、 In totally enclosed motors Thermocouple method 90 162 140 252Resistance method 100 180 140 252c. Class F insulation systems(1) In open motorsThermocouple method 115 207 145 261Resistance method 125 225 155 279OCTOBER 14, 2013 UL 762 9Table 10.1 Continued on Next PageUL COPYRIGHTED MATERIAL NOT AUTH
41、ORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 10.1 ContinuedDevice or MaterialColumn 1 Column 2Degrees DegreesC F C F(2) In totally enclosed motorsThermocouple method 120 216 150 270Resistance method 130 234 160 288B. Components1. CapacitorsElectrolytic typec40 72 (N
42、ot specified)Other typesd65 1172. Field wiring 35 63 60 1083. Relay, solenoid, and other coils (thermocouple method)ba. Class 105 insulated winding 65 117 115 207b. Class 130 insulated winding 85 153 140 2524. Sealing compounds 40C (104F) less than its meltingpoint5. Transformer enclosuresba. Class
43、2 transformers 60 108 85 153b. Power and ignition transformers 65 117 90 162C. Insulated Conductorse1. Appliance wiring material75C (167F) rating 50 90 65 11780C (176F) rating 55 99 70 12690C (194F) rating 65 117 80 144105C (221F) rating 80 144 95 171200C (392F) rating 175 315 200 360250C (482F) rat
44、ing 225 405 250 4502. Flexible cord Types SJO, SJT, SO, ST 35 63 60 1083. GTO cable 35 63 60 1084. Wire, CodeTypes RF, FF, RUW 35 63 60 108Types RH, RFH, FFH, RHW, THW, THWN 50 90 75 135Types T, TF, TFF, TW 35 63 60 108Type TA 65 117 90 1625. Other types of insulated wires See note fD. Electrical In
45、sulation Generale1. Fiber used as electrical insulation or cord bushings 65 117 90 1622. Phenolic composition used as electrical insulation or as parts where failure willresult in a hazardous condition.125 225 150 2703. Varnished cloth insulation 60 108 85 1534. Other material 25C (77F) less than it
46、s temperatureratingE. Metalsg1. Aluminum alloysa. 1100 183 330 239 430b. 3003 259 430 294 530c. 2014, 2017, 2024, 5052 294 530 350 6302. Aluminum-coated steelh572 1030 708 12753. Carbon sheet steel and cast iron 461 830 517 930OCTOBER 14, 2013UL 76210Table 10.1 Continued on Next PageUL COPYRIGHTED M
47、ATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 10.1 ContinuedDevice or MaterialColumn 1 Column 2Degrees DegreesC F C F4. Carbon steel-coated with Type A19 ceramic 572 1030 628 11305. Galvanized steeli267 480 350 6306. Stainless steelTypes 302, 303, 304
48、, 321, 347 686 1235 767 1380Type 309S 867 1560 950 1710Types 310, 310B 894 1610 975 1755Type 316 667 1200 748 1345Type 405 683 1230 795 1430Types 403, 409, 410, 416 572 1030 683 1230Type 430 728 1310 808 1455Type 442 877 1580 933 1680Type 446 961 1730 1042 18757. Zinc castings 89 160 145 260F. Any h
49、andle, knob, grip, and the like that the operator may need to touch to operate,regulate or shut off the grease extractor.1. Metallic parts 33 602. Nonmetallic parts 45 80aThe motor diameter is to be measured in the plane of the laminations of the circle circumscribing the stator frame, excludinglugs, boxes, and the like, used solely for motor cooling, mounting, assembly, or connection.bOrdinarily, coil or winding temperatures are to be measured by thermocouples unl
