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The refrigerant lines joining the indoor coil and the condensing unit are precharged at the factory, wimplifying work on the job The compressor is conâ€" trolled by an indoor therâ€" mostat, preferably comâ€" bined with the heating thermostat _ to _ prevent operation of the furnace and The cooled liquid refrigerant is now pumped back to the evaporator coil, where it is again expanded to a low pressure and, as a consequence, low _ temâ€" perature so it can pick up heat from the indoor air. time The gaseous refrigerant containing the heat is drawn back to the "Compressor‘‘ or pump located in the condenâ€" sing unit, where its pressure and, as a consequence, its temperature are raised. At this higher temperature, the heat can now be rejected. This is done in the condensor coil, where either air or water can be used to take away the heat from the refrigerant. This determines whether the condensing unit will be of the air cooled or water cooled type. Air cooled units are normally installed outdoors, while water cooled units are always installed indoor‘. Residential Air Conâ€" ditioning is rapidly becoming commonplace in the Toronto area. With the advent of air conditioned restaurants, theatres and offices, it is only natural for the homeowner to want the same comfort conditions in his home, particularly with the hot, humid summers in this area. To meet this demand, equipment manuâ€" facturers have concentrated much time and effort on designing and selling equipâ€" ment ideally suited to this segment of the air condiâ€" tioning market. Today, summer comfort is available at the lowest cost in history. The true definition of air conditioning is "the simultaâ€" neous control of temperaâ€" ture, humidity, air moveâ€" ment, air cleanliness and freshness, all accomplished at acceptable sound levels." This article deals only with the central cooling unit which provides summer temperature and humidity control. Principle of Operation Circulated air is passed over a finned copper tube evaporator coil, located in the air duct system. The air is cooled approximately 20 degrees F to 25 degrees F and, in the process, moisture is condensed from the air and collected in a pan thence to a drain pipe. The heat taken from the air has been transferred to a refrigerant, normally a ‘"Freon‘ type. Better living with _ air _ conditioning It is equally important to have the equipment perform at a capacity as close to the estimated load as possible. If the equipment is too small, it will not provide the designed 75 degree temperature inside when the outside temâ€" perature is 90 degrees. If it is too large, then it will be constantly cycling on and off, thereby shortening the life of the equipment. It has so much capacity that the unit only runs for a few minutes to satisfy the load. Choosing the equipment and the installing contractor to air condition your home is a decision many people find difficult. Each one says his equipment is best for your SIZING : It is most imporâ€" tant to have a detailed survey of your house and to have it carried out by a Professional Engineer. He will consider such things as room sizes, window areas, the direction they face, shading from porches, trees and adjacent buildings, roof colour, brick colour, wall construction, duct distribution system, furnace fan capacity, furnace conâ€" dition, electrical service size, drain provisions and many other points. â€" All very important to the proper sizing of the cooling system and to the verification that the present heating distribution system will satisfy the cooling requirements. Residential air conditioning popular EVER INCREASING NUMBER OF UNITS â€" The Westonâ€"Y ork Times, Thursday, May 20, 1971 The final selection should be left to the contractor. Beware of those who size by eye. Units are available in a Do not include rooms subâ€" stantially below grade when estimating the size for your home. On this basis, a 1400 square foot home requires approximately 2 tons of air conditioning. Note, also, that 1 ton of air conditioning â€" 12,000 BTU hr, to convert from BTU hr to tons. and ensuring a leak free system. How Big Should the System Because the â€" central cooling unit must perform two functions, temperature control and humidity conâ€" trol, unit size is very imâ€" portant. The Heating, Refriâ€" geration and Air Condiâ€" tioning Association _ of Canada states that the suggested rate of capacity of the unit should not be less than 9 per cent, nor more than 115 per cent of the calculated cooling requirement of the house. Therefore a proper heat gain for your home _ must calculated to select the correct equipment size. Too large a unit will result in "swamp cooling‘‘ â€" a cool, damp atmosphere. Too small a unit will result in the temperature not being maintained at 15 degree F below the outdoor temâ€" perature. _ The following figures can be used a rough estimate of system capacity: 1 ton â€" 600â€"800 square feet of conditioned space. There are many "QFF~ periods during even a humid day, and the inside air will be very, very, "CLAMMY". Some _ manufacturers, have a variety of sizes of the major components of the cooling systems. These components can be comâ€" The topâ€"ofâ€"theâ€"line IMPERIAL series by Chrysler Airtemp reflect design changes inside and a new look on the outside. The models in cooling capacities of 6,500 to 18,000 BTU‘s have new eloquent decorator fronts that provide for unlimited furniture location and act as a sound baffle for quiet operation. Scenic panels for the IMPERIAL, a first in the industry, offer the utmost for the decorâ€"minded individual. M I f f“_ [ _ (fi â€" _ m‘ 4 BE IN BEAUTIFUL SHAPE THIS SUMMER antin iedÂ¥ / _ PW Ww WwRA A|R CONDITIONING comreo 671 The Queensway, Toronto 18 â€" 252â€"3533 Ask for Tom West, P Fng Your Professional Residential Specialist most accurately match the cooling load. Instead of 3 tons, perhaps 2% tons would be better. bined in a variety of ways to MANUFACTURER : Choose a reputable internaâ€" tional manufacturer, who is well known in the industry wide range of capacities from 1% to 5 tons, to meet any requirement. How Is Air Conditioning Added to an Existing Home? The answer to this wWEST/ get quick, clean, expert instabiation Then we‘ll test and balance your cooling system betore the first warm day Also available in Watercooled style Everything Indoors Call us today $91000 INSTALLED & OPERATING MODE type of home, and who is very active in the residential field. This will ensure a convenient and prompt supply of parts should you require them. For equipment types, you have two choices of fuel: gas and electricity. With electric units you have two choices of condensing mediums, water question depends on the type of heating system and the 18.000 B T U PRICE cooled (located inside) and air cooled, (located outside). Both are refrigerant systems and have the same coil in the furnace duct. from the installing conâ€" questions and give complete tractor for the names of instructions, in a language people who already have this you will be able to underâ€" sort of equipment in their | stand. homes, probably right nearby. They will be the best testimonial of not only the _ Check out your contractor equipment, but also the with the Better Business installing contractor, his Bureau, 363â€"7111; The promptness, his cleanliness Heating, Refrigeration, Air and his service. Conditioning Institute, 677â€" If you are having difficulty deciding on the type of the Carrier central air conditioning 24,000 Btu _ ‘ cooling capacity ;:;’ggm Install new, lowâ€"priced Carrier air conditioning * Your system installed, tested and balanced by Carrierâ€"trained people. Ready to stop sumâ€" mer discomfort immediately A cool way to beat the summer heat 154547 KEELE ST.â€"TOR. 168 Look at what you get! * Famous Carrier quality in a 24,000 Btu unit, complete with thermostat, condenser, cooling coil and tubing, to provide air condiâ€" tioned comfort for the average sixâ€"room house . . . at this low, low price! We have just the right Cartier unit for your house. Call us today! Model 38GCO02 with matching cooling coil $9 50 ;°0 EASTERBROOK Authorized BROS. LIMITED 653â€"6212 (installation included) rugs, walls and furnishings is important. They will wear shoes that slip off easily at the door and will answer any questions and give complete are accustomed to working CONTRACTOR: Choose a contractor who specializes in the residential field. They Deater Rated on in accordance with ARI Standard 210.64 Read your proposal thoroughly, (all items and labour should be specified) as well as the manufacâ€" turer‘s literature, where you will find itemized, a list of operating _ and _ safety 4437 and the American Society _ of Heating, Refrigerating and _ Air Conditioning Engineers, Inc. 366â€"6811, extension 67. Preâ€"Season Special waltn AIR CONDITIONERS T save MOoST IMPORTANT: * Crankcase Heater * Refrigerant Sight Gtass * Low Voltage Transformer AIR TREATMENT SYSTEMS PUT THIS NEXT TO this spring ... YOUR HOME the famous round one made only by Carrier Time Guard Circuit * Crankcase Heater * Refrigerant Sight Glass bat Low Voltage Transformer We Treat Any Air Condition" FMa‘ dins. 4n Vif 1 Air Conditioning â€" Electric Air Cleaning â€" Humidification Now. .when you need it most. At a price you can really afford. Installed promptly expertly. Call today and order yours now. EP W AIR CONDITIONING CO. advantage of thi SAVING. Free Estimate call Phone 279â€"3440 since 1932 The Home Comfort People 7817111 1713 Mattawa Ave. features to ensure complete pare items and features, to comfort and long equipment _ get the most for your money. life. Make a test and comâ€" Authorized @op Deater CLIMATE ENGINEERED BY If installed more than 1 year ago, it may be in desperate need of preventive maintenance. We offer a preâ€"season overhaul which also includes pickâ€"up, steam cleaning and reinstallation for just $39.95 (most makes). 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