Document Ddy114vgjr1XgBRpjaao2O7YN

930 CHAPTER 64 1965 Guide And Data Book Table ] . Typical Performance and Physical Data for Conventional Room Air Conditioners Btuh Volts Amperes Watts Btu/whr Dehumidification Pts/Hr Evaporator cfm Ventilation cfm Exhaust cfm ` Cabinet Height. In. Cabinet NVidth, In. Cabinet Depth. In. Net Weight, Lb Sensible Heat-Ratio, % 6500 115 7.5 890 7.3 8500 115 12.0 1350 6.3 9500 230 8.1 1600 5.9 10,800 12,000 14,000 16,000 18,000 20,000 25,000 30,000 115 230 230 230 230 230 230 230 12.0 9.4 10.0 11.5 12.7 13.0 18.5 22.0 1400 1950 2200 2500 2750 2800 3900 4950 7.72 6.2 6.3 6.4 6.6 7.2 6.4 6.1 6.62 1.8 240 35 45 X5H 25 . 16H 115 -70.5 2.5 280 50 60-j 2.8 290 50 65 15H 15)4 25 25 ..J6)$ .18)4. ' 125 - -"130 69.0 '69.0 2.9' -- 3.6" 4.0 5.0 355 350 410 420 55 70 80 95 75 xj ^80/ . - ,90/ . ? loo t W17 ' _S15 15>$ 26 25 25 .24)4. .21 . ?3H 173 ' '150 "165 71.5- -09.2 69:5 ' if * 25 23)$ 175 " 67:0'- 5.3 495 95 *100/ ' 18"' 25 25,.-185*' -69;o 6.2 7.5 9.0 535 680 950 110 110 125 120; -. 125 J70,. ri75 20' 22 ^ 22~ ` - 22' 27 27 27 28 35 ... 36)$ 36)$. ' 220 ' -280' ' 350' 350 * `67.0 "68.0- 68)0 i- 68.0 The ftbor* dt* represent compiled evente of eeml makes of room air eoaditiooen a* reported in the Air CeacKCtemns, Btatinc Rtfriemtian ffwte* of Jan. , 1902. - ................................. ................................-.............................. ...... .................. ................................. PERFORMANCE DATA . Industry standards for the performance of`room air,con ditioners are presented in NEMA Standards `PublicatianWo'.' CN-1. These standards prescribe the various tests which-any production room air conditioner' must pass and prescribe minimum performance standards for`such room air; condi tioners. The following tests are specified: Cooling Capacity: Units must be tested using the ASHRAE' Standard 16--61, Method of Testing for Rating Room Air Condi tioners. The test conditions axe: ! >' Indoor Room Air * 80 F db, 67 F wb Outdoor Air 95 F db, 75 F wb - . . ' - A certification program under, the-sponsorship of'NEMA coven the great majority of room air conditioners manufac tured. Under this program, the cooling capacity of any certified model must be within 02 percent of the units' nameplate value. Total watts and ampere input must be within 110 percent of the. unit's nameplate value. Table 1, gives cooling capacity values for units which are born mdered conventional as to size and performance. '` - Heating Capacity: Units must-be rated at the following test conditions: . Indoor Room Air 70 F db Outdoor Air 45 F db, 42.9 F wb - > The heating capacity of any production unit must be within 02 percent of its nameplate rating. ' Maximum Operating Conditions: - Indoor Room Air 90 F db, 73 F wb: Outdoor Air = 110 F db, 78 F wb. The unit shall be run at this condition at 90, 100, and 110 percent of rated voltage, continuous for three hours after which the power hnll be cut off-for two minutes and the unit must restart within five minutes and run for one hour. Inclosure Sweat Test: Indoor Room Air - 80 F db, 75 wb; Outdoor Air 80 F db, 75 F wb. During-the test, no condensate water shall drip, run or blow off the unit. Condensate Disposal Test: Indoor Room Air *= 80 F db, 75 F wb; Outdoor Air 80 F db, 75 F wb. During this test the room air conditioner h<dl have the ability to dispose of all condensate and there'shall be no dripping or blowing off of water from the unit such that the build ing or surroundings may become wet. Locked Rotor Currents; The total locked rotor current of any room air conditioner motor designed for simultaneous start by the cdntrols provided shall not exceed the amperage specified in the following tabulation. Capacity -- Btuh Operating Voltage Amperage Up to and including 20,000 115 volts, single phase Up to and including 20,000 . 208/230 volts, single , . .phase 20,000,to 33,000 208/230 volts, sinfde . phase - 50 60 -60* - * Plus 3 amps per 1000 Btuh in excess'of-20,00Q Btuh. . ;!, i Freeze-up tests: ' ''^ : Indoor Room Air .* 70 F db, 60 F wb; Outdoor Air * 70 F'db,. 60 F wb. During these tests frost or ice on the evaporator coil shall' not build up tb-the extent that air flow cannot circulate through- the-unit and at no time shall-ice or water drip or blow off the' uniton the room side. , > Power Factor test: * *' Indoor Room Air;*=80F db, 67 F wb; Outdoor Air = 95 F db) 75 F wb.The minimum power factor of any production unit'run' at these conditions shall be as follows: Btuh . , ' ' Up to 4000 4000-6000/ Over.6000:- PF, percent ,, ' ' ' -75 ' 80 !' ; 85 .Another important performance factor is the Btu/whr value of a room air conditioner. Table 1 indicates'values ranging from 5.9 to 7.72: These data axe useful in comparing operating costs of dif ferent units which may have'identiea! coming capacities. - .' The ratio of sensible to total heat is .another, performance factor that is often oyerlooked. Table. 1 indicates values rang ing from 67.0 percent to 71.5,percent. While a value dose to! 70 percent has been considered optimum by many manufac turers, certain areas of the eouhtiy such as Phoenix and New Orleans might be better served by units.with much higher and V-.!'lower ratios respectively.^!.-, -. - . It diould he. noted that the axes of room air conditioners vary almost directly with cooling capacity. This is necessarily so since -compressors, condenser and evaporator coils and air moving -means all increase in sixe as cooling capacities are increased.; v. . ... ,!/!,, .\ ; ; v ; SPEOA^ DESIGN; FEATURE) j .. Conventional -room air conditioners extend.-considerably beyond .the building when mounted-flush .with-the inside wall, but-thin models protrude only, about a foot,,and,, therefore, present a somewhat better appearance on the outside. Low capacity'models generally are smaller than higher capacity RoomAir Conditioners and Dehumidifiers 931 modelsand therefore, are less obtrusive.'All window-mounted units block out some of the window light! Conventional units usually block'less light than thin units. Through-the^oaU units provide a better appearance than window-mounted units, because they do not interfere-with the window or block out light. Condenser grilles are often designed to harmonise with the exterior architecture.of-vari ous buildings. Much effort is directed toward harmonising'the design-of room air conditioners with the modem decor of rooms. Some designers prefer a.subdued approach, and.blend the unit into its surroundings, 'others favor a more decorative approach. Plastics, fabrics, and perforated metals in a multiplicity of colors provide the industrial designerwith the necessary-ma terials, for- control .knobs, grilles, escutcheons and-frames corresponding with modem taste. Even adhesives and similar materials contribute to improved styling. .- ;> - Most units have adjustable louvers or deflectors. to:dis- tribute-the air into the'room-with satisfactory throw.and without drafts. When the unit has only one deflector, all air is-delivered in one direction;, when it has several deflectors, the air can be deflected in several directious simultaneously. Discharge air velocities range from 300 to 1200 fpm with low velocities preferred in,rooms where people are at rest. - Most room air conditioners are designed for bringing in out door. air or exhausting room air, or both. Controls usually permit these features to function independently for maximum individual effect. When ventilating is provided with codling, the amount of ventilation air is reduced since it will add to the cooling load. Temperature control of- room air conditioners is provided by a built-in'adjustable-thermostat which cycles'-the com pressor on and off but keeps the fan running. This provides for continuous air-circulation and makes' the thermostat more sensitive to room temperature changes. -- :::: -Most room air conditionera are simple to operate. Usually one control serves to electrically operate the'unit and-a second 'to- control the temperature. Additional-knobs-or levers are provided to operate louvers,-deflectors, ventilation and exhaust dampers and other special features offered. Accessibility'of the control knobs is-essential. They are usually arranged on'the front of the unit, or concealed behind a readily accessible door, but they may-also be arranged on top or sides of the unit. The legend at the controls is usually legible and large enough to be seen easily when adjustments are made. ' Filters on* room air conditioners remove airborne dirt to provide clean air to the room;'They also keep dirt off-the cooling coilsurfaces. They are made of expanded metal; with or without a viscous oil coating, glass fiber or synthetic ma terials and are of the throw-away or reusable' type. - ' filters are usually readily accessible; One of the most'fre- quent causes for unsatisfactory performance is a dirty filter, which causes a reduction in cooling and air circulation, and frequently frost accumulation on the cooling coil. Therefore, filters are so located that they can be checked and replaced easily.- .- . Some* units have louvers or grilles at the rear to-pro tect the condenser 'fins, which is particularly important for units installed on the first floor;These louvers separate the air streams to and from the condenser, and thus reduce recircula tion. However, they restrict' tire air flow somewhat, and add to the cost of tire unit* Side louvers on the outsideof the unit improve condenser1 air flow) but usually'cannot be' used bn through-the-wall ingtoHatinnK - ' ' Quietness of the rqom. air conditioner is of prime impor tance, particularly when' the unit is'installed in a bedroom. A certain amount of noise is to be expected due to the move ment of the air through the unit and the operation of the compressor. However, the sound level of well-designed room air conditioners is relatively Low and free from high pitched and metallic noises. Sometimes fan motors with two or more speeds are used to provide a slower fan speed for operation during night hours. To avoid rattles and vibration in the building structure, all units must be correctly installed. (See section Installation and Service.) Room air conditioners usually have a durable finish, par ticularly on the parts exposed to the' weather. Good practice calls for baked finishes over phosphatixed or zinc coated steels. Nonferrous materials like aluminum, and occasionally stain less steel, are also used. CODES AND STANDARDS Standards for Safety for Room Air Conditioners (Under writers' Laboratories--Bulletin UL 484, rev. 1961), must.be observed with regard to such items os strength of the window mount, rain tests for shock hazards, fusing for abnormal volt age and load conditions, temperature rise tests for electrical breakdown, fire hazards and the like before a room air con ditioner will be approved by the Underwriters' Laboratories. Units to be approved are sent to UL where they undergo ex tensive tests. Further tests and inspections are performed.in the manufacturers' plant. Approved room air conditioners are listed in the official UL publication Electrical Appliances and Utilization Equipment fast under the manufacturer's name and by model number and may carry the UL label. It should be noted that the Underwriters' Laboratories' Standards are in conformance with the National Electrical Code. -The Canadian Standards Association Code has similar requirements (Specification C22.2 No. 117-1960, Construction and Test of Room Air Conditioners, which must be met before a room air conditioner will , be approved by the Canadian Standards Association. Units to be approved are sent'to the CSA Testing Laboratories for tests, although under certain circumstances evidence of compliance with UL requirements may suffice in lieu of actual testing. Approved roomair conditioners are listed in the official CSA publication List of Approved Electrical Equipment. It should be noted that the Canadian Standards Association Code is in conformance with the Rules of the Canadian Elec trical .Code, Part I. . !.s\. The American Standard Safety Code for Mechanical Re frigeration, ASA B9.1-1964, gives the pressure requirements in the refrigeration system which must be met to obtain UL approval. UL listings are accepted by nearly all government agencies, although in a few localities, additional requirements may be enforced. The Federal Housing Authority has pub lished specifications governing conditioners installed in build ings insured by FHA (PHA Minimum Property Standards[ P206-2G7)--and other government agencies have doae'tife same'(See, for example Military Specification MIL-A-21047 B and General Services Administration Specification 00-A-372, -being revised.) These specifications generally follow the com mercially accepted standards to obtain the best possible con ditioners at the lowest price. Exceptions are made only for special applications. ` ',! i The National Safe Transit Committee develops and pro motes package testing standards to assure safe transport*;! tion of products. (NSTC, 45 E. 22 St., New York, N. Y., Test Procedures 1963.) Packages carrying the NSTC'seal of ap^ proval have been tested by NSTC approved laboratories and comply with these standards. t The National'Electrical Manufacturers Association Staid-