Published at Monday, March 25th, 2019 - 00:18:36 AM. wiring. By Harriette Buisson.
One time I had a buddy with 90 “defective” boilers; this was the guy who forgot to check the gas meters. The next time he called me he had 265 defective boilers. Of course, my first question was, “Do you have gas?” After I got called some nasty names, we proceeded with the questioning. I asked him if he had 110 V to terminal L1 and L2. This is always our starting point, making sure the electricity is turned on. I got the classic answer: “How do I know, I’m only a plumber.” I asked to speak to the electrician, who confirmed that he had power to L1 and L2. I asked what the voltage was; sometimes you have lower voltage and the system won’t work. He confirmed that he had 120 V. Next, I asked him if he had continuity through the control circuit. His answer was, “I’m a union electrician, I put power to the boiler and hook up thermostats; I don’t know about boiler wiring.” It was time for a field visit.
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.”
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