Ventilation Air Conditioning

Download Electrical Applications for Air Conditioning & Refrigeration by Billy C. Langley PDF

By Billy C. Langley

Electric troubleshooting is potentially the main overlooked region of holding air con and refrigeration gear. This textual content explains and illustrates tools for troubleshooting the complete spectrum of electric or digital circuits of those structures. finished sections supply assurance of electric basics, single-phase electrical cars, three-phase vehicles, keep watch over units, electric keep an eye on circuits, use of schematic diagrams in troubleshooting, ice makers, good nation electronics, and uncomplicated digital controls. The author's transparent, concise assurance of controls allows you to fast comprehend either how a selected form of keep watch over works, and the way it's utilized in the method. you will find a wealth of helpful directions for making operational exams and troubleshooting for correct operation. The e-book is very easily divided into application-specific devices, making it effortless to quick locate details particular to a specific task handy.

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Additional info for Electrical Applications for Air Conditioning & Refrigeration Systems

Sample text

It will automatically return the meter to operation after the overload has been removed. The other method is to use an internal fuse that will blow and must be changed before the meter can be used again. Meters are available in single meter cases and multimeter type cases. There are advantages and disadvantages to both types. The more meters in one case the more expensive it is to buy. Also, when one meter needs repair the complete unit must be sent to the repair shop. Thus, making it more difficult to find a temporary replacement.

The voltmeter can also be used to test the voltage across a capacitor. Connect the voltmeter to the terminals of the capacitor and start the unit. After the unit has started read the voltage indicated. This will indicate the minimum voltage requirement of the capacitor.

See Figure 6-7. Figure 6-7 Circuit for example 6. Step 1 Determine which formula to use. P = I2R. Step 2 Fill in the known components. P = 72 × 15. Step 3 Solve for the formula. P = 735 W. Page 33 Unit 7 Electrical Instruments Air conditioning and refrigeration systems use electricity for control systems, fan motor operation, and compressor operation, to name the major uses of electricity for these systems. About 80% of all troubles with these systems are electrical in nature. To efficiently service these systems electric meters are used on a daily basis.

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