By Billy C. Langley
Electric troubleshooting is potentially the main overlooked zone of keeping air con and refrigeration gear. This textual content explains and illustrates tools for troubleshooting the total spectrum of electric or digital circuits of those platforms. finished sections provide assurance of electric basics, single-phase electrical automobiles, three-phase vehicles, keep watch over units, electric regulate circuits, use of schematic diagrams in troubleshooting, ice makers, strong country electronics, and uncomplicated digital controls. The author's transparent, concise assurance of controls lets you fast comprehend either how a selected kind of keep watch over works, and the way it's utilized in the process. you will find a wealth of helpful directions for making operational assessments and troubleshooting for correct operation. The publication is comfortably divided into application-specific devices, making it effortless to fast locate info particular to a specific activity handy.
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Additional info for Electrical Applications for Air Conditioning & Refrigeration Systems
When the piece of fur is brought close to the suspended rubber rod without them touching, the opposite charges will cause the two objects to be attracted to each other. The rod will tend to swing toward the fur. See Figure 3-5b. Page 13 When the positively charged glass rod is brought close to the suspended rubber rod without them touching, the two rods will be attracted to each other. Causing the suspended rubber rod to swing toward the glass rod. See Figure 3-5c. When a piece of silk is brought close to the suspended rubber rod without them touching, the like charges will tend to cause the rubber rod to swing away from the piece of silk.
This will indicate if the line voltage is out or if the fuse is blown. When a voltage is indicated the fuse is blown. When a voltage is indicated the fuse is usually good. See Figure 7-6. Figure 7-6 Checking fuses with a voltmeter with the power on. Page 40 To check for a voltage drop, connect the meter leads to the terminals of the component being tested and observe the voltage reading while the unit is starting. The voltage may drop slightly during the starting phase and then return to normal.
These are generally used when testing the windings in electric motors. All electric circuits and devices have some resistance that is inherent to them. The resistance of the components will depend on their designed use. Technicians in this field must know how this affects total unit operation and be able to make the necessary tests to determine the condition of unit components. When the resistance reading is outside the manufacturers recommended tolerances the component can be assumed defective and must be replaced.