Published at Tuesday, March 26th, 2019 - 08:41:22 AM. wiring. By Natuche Adam.
This book provides HVAC/R service technicians with exceptionally practical information on the unique wiring diagrams, methods, technician short-cuts, and potential pitfalls encountered on the job. It begins with a discussion of general electricity and electrical circuits, and then moves quickly into explaining wiring diagrams for HVAC and refrigeration systems, and the new devices that are encountered with each new diagram. It features accessible, technician-levelexplanations of electronics. KEY TOPICS: Electrical Concepts. Simple Currents. Standing Pilot Furnaces. Heating/Air Conditioning Circuits. Troubleshooting Strategies. Testing and Replacing Common Devices. Repair Strategies. Commercial Systems. Motor Applications. Power Wiring. Testing and Replacing Motors and Start Relays. How Motors Work. Low-Voltage Room Thermostats. Electronic Ignition Gas-Fired Furnaces. Oil Heat. Electric Heat. Boilers. Heat Pump. Ice Makers. Miscellaneous Devices and Accessories. Wiring Techniques. DDC Controllers.MARKET: For HVAC/R service technicians. Well-known industry author and instructor Jim Johnson is offering a new video for technicians who want to sharpen their troubleshooting skills.”This HVAC training video program, is available in DVD format, is somewhat of a departure from what we’ve offered in the past,” said Johnson. ”It was produced specifically for technicians who really don’t need theory on electrical fundamentals, but want to know more about how to read schematic diagrams and then use them to track down the source of the problem in an HVAC/R system that’s down.” According to Johnson, ”Using Schematics To Troubleshoot HVAC/R Electrical Circuits, Part 1” came about because of feedback from the industry. ”It’s shorter than our fundamentals training videos, and the Technician’s Resource Guide contains only the diagrams and a short introduction of fill-in-the-blank information It doesn’t incorporate review questions and in-depth theory like our fundamentals programs do.”
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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