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Electrical problems account for more than 80% of all service scenarios. Electricity for HVAC&R - A Guide to Troubleshooting provides the technician with the information necessary to successfully diagnose electrical problems.Electricity for HVAC&R - A Guide to Troubleshooting is a practical view of what electricity is and how it works. It is more than just a textbook. Each subject is addressed by answering the most frequently asked questions about electricity.