Troubleshooting techniques often require simultaneous knowledge of temperature, pressure, voltage, and current values in a system, which means that a single-function meter won't permit a complete analysis of the system. Frequently, multiple tools are required.
This article provides information on troubleshooting the refrigeration system while applying the principles of superheat and subcooling to HVACR equipment. It will also teach you the proper methods to tackle some typical troubleshooting tasks using thermometers, digital multimeters, pressure/vacuum modules, and HVACR accessories. Basic refrigeration principles are provided solely to illustrate how digital thermometers, multimeters, and accessories can make servicing and maintaining HVACR systems straightforward, fast, and accurate.