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Describes AVPTC air handler features, including variable speed and multi-position.
Describes the design and operation of the condensing unit, including compressors.
Explains the principles and operation of the cooling cycle.
Details the defrost cycle control mechanism for ComfortNet systems.
A diagnostic chart to identify causes and remedies for cooling/heat pump issues.
Procedures for checking voltage, wiring integrity, and thermostat connections.
Lists diagnostic codes and troubleshooting steps for air handler control boards.
Provides a table of unitary diagnostic codes, possible causes, and corrective actions.
Details safety warnings and procedures for checking compressor windings and ground.