Download Air Conditioning and Refrigeration by Rex Miller PDF

By Rex Miller

Air-con and Refrigeration is helping you know todays cooling and weather keep an eye on 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 assistance to studying the alternate for college kids, execs, and owners who are looking to do their very own installations or repairs.
Written through skilled academics Rex and Mark R. Miller-whose Carpentry & development has been a development vintage for greater than 25 years-Air Conditioning and Refrigeration has the entire task-simplifying information you wish for any venture. within the well known Miller variety, this whole and present consultant helps:
•New and pupil technicians. construct on-the-job abilities 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 recent cost-cutting applied sciences, refrigerants, and tools.
•Do-it-yourselfers and householders. Make specialist apparatus and gear offerings and attain stronger effects, economically.
•Service body of workers, technicians, contractors, engineers, and facility managers. locate up to date info on codes, criteria, security assistance, and methods.
•Anyone who wishes transparent, illustrated, step by step directions for effective, low in cost, and present equipment in deciding on, fitting, retaining, troubleshooting, servicing, and repairing todays AC and refrigeration apparatus.

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Extra resources for Air Conditioning and Refrigeration

Example text

The correct voltage is needed for the equipment to operate according to its designed specifications. The voltage range is usually stamped on the nameplate of the device. Some will state 208 V. This voltage is obtained from a three-phase connection. Most home or residential voltage is supplied at 120 V or 230 V. The range is 220 to 240 V for normal residential service. The size of the wire used to connect the equipment to the line is important. If the wire is too small, voltage will drop. There will be low voltage at the consuming device.

The superheat at any point in a refrigeration system is found by first measuring the actual refrigerant temperature at that point using an electronic thermometer. Then the boiling point temperature of the refrigerant is found by connecting a compound pressure gage to the system and reading the boiling temperature from the center of the pressure gage. The difference between the actual temperature and the boiling point temperature is superheat. If the superheat is zero, the refrigerant must be boiling inside.

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. 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.

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