Read e-book online Air Conditioning and Refrigeration PDF
By Rex Miller
Air-con and Refrigeration is helping you realize todays cooling and weather regulate systems-so expertly so that you can use it because the starting place for a occupation! transparent instructions-with over 800 photos and illustrations-offer step by step suggestions to studying the exchange for college kids, execs, and householders who are looking to do their very own installations or repairs.
LEARN WITH THE PROS
Written by way of skilled lecturers Rex and Mark R. Miller-whose Carpentry & development has been a development vintage for greater than 25 years-Air Conditioning and Refrigeration has all of the task-simplifying info you would like for any undertaking. within the well known Miller kind, this entire and present consultant helps:
•New and scholar technicians. construct on-the-job talents and the data had to reach a fast-growing, profitable field.
•AC and refrigeration professionals. Refine and replace talents, with complete details at the most modern cost-cutting applied sciences, refrigerants, and tools.
•Do-it-yourselfers and owners. Make professional gear and power offerings and attain improved effects, economically.
•Service team of workers, technicians, contractors, engineers, and facility managers. locate updated info on codes, criteria, security suggestions, and methods.
•Anyone who wishes transparent, illustrated, step by step directions for effective, cost-efficient, and present tools in determining, fitting, retaining, troubleshooting, servicing, and repairing todays AC and refrigeration gear.
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Extra info for Air Conditioning and Refrigeration
A restriction screw protects the gage against sudden impact, shock, or pulsating pressure. A heavyduty movement of stainless steel and Monel steel prevents corrosion and gives extra-long life. The inner arc on the dial shows pressure. The other arc shows the corresponding temperature. See Fig. 1-24. Fig. 1-24 Ammonia gage. (Marsh) Line Pressure The important consideration regarding line pressures is to determine whether the pressure reading will be constant or whether it will fluctuate. The maximum pressure at which a gage is continuously operated should not exceed 75 percent of the full-scale range.
Air-conditioning units and systems also rely upon volume and velocity for proper distribution of conditioned air. Only a small number of contractors are equipped to measure volume and velocity correctly. The companies that are doing the job properly are in great demand. Professional handling of air volume and velocity ensures the efficient use of equipment. Large buildings are very much in need of the skills of airbalancing teams. Some people attempt to obtain proper airflow by measuring air temperature.
Remove the reaction plate. Scrape its surface with a knife or screwdriver blade, or install a new plate. ELECTRICAL INSTRUMENTS Several electrical instruments are used by the airconditioning serviceperson to see if the equipment is working properly. Studies show that the most trouble calls on heating and cooling equipment are electrical in nature. The most frequently measured quantities are volts, amperes, and ohms. In some cases, wattage is measured to check for shorts and other malfunctions. A wattage meter is available.
Air Conditioning and Refrigeration by Rex Miller