Abstract: A system for analyzing and charging an HVAC line set is provided herein. The system includes an input connector configured to receive pressurized gas from an external source, an HVAC high port and an HVAC low port configured to connect to high-pressure and low-pressure sides of the HVAC line set, respectively, and a reference volume chamber fluidly connectable to the HVAC ports. The system further includes electronically controlled valves configured to selectively establish fluid pathways between the input connector, reference volume chamber, HVAC ports, and a vent, a vacuum connection configured to connect to a vacuum pump, a precision pressure sensor configured to measure pressure within the system, and a controller. The controller is configured to operate the valves in a purge mode, measurement mode, leak test mode, vacuum mode, and charge mode.