R12 Refrigerant Ph Chart — Pdf !!link!!

For decades, R12 (dichlorodifluoromethane, or Freon-12) was the undisputed king of refrigerants. It powered everything from automotive AC systems in your grandfather’s Cadillac to grocery store freezers and domestic refrigerators. However, following the Montreal Protocol, R12 production was phased out globally due to its high Ozone Depletion Potential (ODP). While new systems no longer use R12, millions of legacy systems are still in operation, relying on reclaimed, recycled, or carefully managed stocks of this refrigerant.

Without the original , you are retrofitting blind.

Even with a high-quality , technicians often make these mistakes: R12 Refrigerant Ph Chart Pdf

Download a high-resolution , print it on 11×17 paper, laminate it, and hang it next to your gauge set. In five years, when everyone else has given up on that 1985 reach-in cooler, you’ll be the one who brings it back to life—with science, not luck.

You might be tempted to use a general refrigeration chart or retrofit data for R134a. This is a critical mistake. R12 and R134a have different molecular weights, boiling points, and pressure-temperature relationships. Using an incorrect Ph chart will lead to: While new systems no longer use R12, millions

At the condenser outlet, the refrigerant is a saturated liquid at 100°F. This is on the left side of the dome, at the intersection of 138.8 psia and the saturated liquid line.

Before diving into the specifics of the R12 PDF, let’s review the basics. A Pressure-Enthalpy diagram is a graphical representation of a refrigerant’s thermodynamic properties. On any , you will find specific axes: In five years, when everyone else has given

The is more than just a graph; it is a key to understanding fundamental thermodynamics without relying on automated software. It teaches you how pressure, temperature, enthalpy, and entropy interact visually.

⚠️ Most “PH charts” online have wrong saturation curves or mismatched units. One wrong value = one dead compressor.

Let’s say you have an old True freezer running R12. Your gauges read suction and 120 psig discharge. Here’s how the PH chart helps: