The saturation temp in mQ does not agree with my refrigerant PT chart, my digital gauges, or my refrigerant app, why? The superheat and subcooling are the same.

The saturation temp in mQ does not agree with my refrigerant PT chart, my digital gauges, or my refrigerant app, why? The superheat and subcooling are the same.

The saturation temp in mQ does not agree with my refrigerant PT chart, my digital gauges, or my refrigerant app, why?

The superheat and subcooling are the same.

This is normal and an advantage to using mQ. Your TP chart and most apps do not determine or consider the average coil temperature. measureQuick calculates the average coil temperatures using the weighted midpoint or the midpoint of the refrigerant glide. This is so we can determine the target pressures based on design temperature differences AND so that you know the coil temperature.

The superheat and subcooling are calculated from the dew point and bubble point of the refrigerant.

For a detailed explanation with images and video, see How measureQuick Calculates Superheat & Subcooling. For other refrigerant-related questions, see Refrigeration FAQs.

    • Related Articles

    • Bluetooth Troubleshooting

      A bug preventing some Android devices from detecting Seitron digital manifolds during Bluetooth scans has been fixed. Make sure you are running the latest version of measureQuick. This document provides information to help you with the Bluetooth ...

    • App Troubleshooting: Crashes, Errors & Cache Clearing

      App Crashes or Freezes Force-close and reopen iOS: Swipe up from the bottom (or double-tap Home), find measureQuick, swipe it up to close. Android: Open Recent Apps, swipe measureQuick away. Reopen the app. Unsaved data from the current session may ...

    • How do I work with a High Efficiency / Oversized Evaporator in mQ?

      A high efficiency or oversized evaporator is elected when the evaporator is larger than the condenser (ie. the condenser is a 3-ton and the evaporator is 3.5 ton) to drive up the suction pressure and the efficiency by decreasing the compression ...

    • Report Troubleshooting: Generation, Branding & Sharing

      Report Not Generating "Generate Reports" button is missing or grayed out You need a saved test before reports are available. Complete your measurements, then tap Save before generating a report. If you started a project but did not run a test ...

    • Sync Troubleshooting: Projects Won't Load & Data Recovery

      Projects Not Loading or Stuck on "Loading Projects" Check your internet connection. Cloud-synced projects require a data connection to load. Try switching between Wi-Fi and cellular data. Force-close and reopen the app. This clears the sync queue and ...