Published at Tuesday, March 26th, 2019 - 00:40:38 AM. wiring. By Leola Dupond.
The HVACR Wiring Troubleshooting Trainer Program is a module designed to help teach HVACR students how to troubleshoot heating and cooling control systems. It contains an interactive computer program, instructor’s manual, student workbook, student assessment, PowerPoint presentations, and the instructions on how to build instructor and/or student hands-on trainers. This module training program covers five areas of study: symbols, sequence of operation, series and parallel circuits, relays (coils and contacts), and troubleshooting. The interactive computer program uses a basic heating and cooling control ladder wiring diagram. The module can be taught in a four-hour block time frame or spread out over the instructor’s whole lesson plan.
The first things we need to do are check the compressor electrically and make sure it is safe to start; after making sure the compressor is safe to start, we need to reconnect it and see if it will start — the start assist (PTC) device may be defective; and when and if the compressor starts, we need to give the system a thorough check up to see why the technician was even doing what he was doing to cause him to disconnect the compressor,” Bob replied. “How can we make sure the compressor is safe to start?” Tim asked. “We want to make sure that it is safe to apply power to the terminals, Bob said. ”Use the Ohmmeter set on RX10K (10,000 Ohms). Second, fasten one lead to a good ground, scrape any scale or paint off the suction line, for example, and firmly hold the lead to the bare spot. Then, touch the other lead to one of the compressor terminals and record any reading. There should not be a reading. If there is a reading, the compressor has a ground circuit in the compressor. A circuit from the motor windings to ground. ”To illustrate how your meter works, you should be able to read a slight reading through your body if you hold one lead in each hand,” Bob continued. ”
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