Arkansas HVACR NewsMagazine March 2025

HVACR NewsMagazine March 2025

Tech News

to open and close the orifice as needed to maintain a constant superheat. We still need to measure the superheat to ensure the EEV is doing its job. These EEVs can also be misdiagnosed due to poor airflow or insufficient liquid at the valve. Superheat is a measurement that I think we have slowly drifted away from because it has seemingly lost some of its value. Piston-style metering devices are less common nowadays, so we don't set the charge by superheat as often anymore. And while most modern HVAC systems utilize TXVs or EEVs to maintain a manufacturer's superheat I still think the case could be made that it is a valuable measurement when looking at the overall health of the system. So, let's take a look at solving superheat. Using the Diagnostic Solve Sheet The first measurement to take is the actual suction line temperature. There are no tricks here; we are simply measuring the suction line's temperature. By attaching a reliable temperature measuring tool, such as a temperature clamp, we can determine the temperature of the refrigerant at that point in the suction or low-side line. Suction Line Temperature

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