Download e-book for kindle: Air Conditioning and Refrigeration by Rex Miller

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By Rex Miller

ISBN-10: 0071487417

ISBN-13: 9780071487412

Air con and Refrigeration is helping you already know 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 images and illustrations-offer step by step information to studying the exchange for college students, pros, and owners who are looking to do their very own installations or repairs.
LEARN WITH THE PROS
Written via skilled lecturers Rex and Mark R. Miller-whose Carpentry & building has been a development vintage for greater than 25 years-Air Conditioning and Refrigeration has the entire task-simplifying info you wish for any undertaking. within the well known Miller type, this entire and present consultant helps:
•New and pupil technicians. construct on-the-job abilities and the information had to reach a fast-growing, profitable field.
•AC and refrigeration professionals. Refine and replace talents, with complete info at the newest cost-cutting applied sciences, refrigerants, and tools.
•Do-it-yourselfers and householders. Make specialist gear and gear offerings and accomplish enhanced effects, economically.
•Service team of workers, technicians, contractors, engineers, and facility managers. locate up to date details on codes, criteria, defense guidance, and methods.
•Anyone who wishes transparent, illustrated, step by step directions for effective, low cost, and present equipment in picking out, fitting, conserving, troubleshooting, servicing, and repairing todays AC and refrigeration apparatus.

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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. For the best performance, gages should be graduated to twice the normal system-operating pressure. This extra margin provides a safety factor in preventing overpressure damage.

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. However, it must be used to measure volt-amperes (VA) instead of watts. To measure watts, it is necessary to use DC only or convert the VA to watts by using the power factor. The power factor times the volt-amperes produces the actual power consumed in watts. Since most cooling equipment use AC, it is necessary to convert to watts by this method.

Most gage manufacturers have both stock items and specially manufactured gages. 10 Air-Conditioning and Refrigeration Tools and Instruments Since 1939, gages used for pressure measurements have been standardized by the American National Standards Institute (ANSI). Most gage manufacturers are consistent in face patterns, scale ranges, and grades of accuracy. Industry specifications are revised and updated periodically. Gage accuracy is stated as the limit that error must not exceed when the gage is used within any combination of rated operating conditions.

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Air Conditioning and Refrigeration by Rex Miller


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