Refrigerants & Charging
PT basics, superheat and subcooling, A2L refrigerants, recovery, leaks.
How to Read a PT Chart: Saturation, Dew Point, Bubble Point and Glide
Use a pressure-temperature chart to turn gauge pressure into saturation temperature, and know when to use dew point vs. bubble point on blends.
R-32 vs. R-454B: The Differences That Matter on a Service Call
Side-by-side comparison of R-32 and R-454B for techs, covering composition, GWP, pressures, glide, discharge temperature, charging and safety.
R-454B for Technicians: Pressures, Charging, Tools and Safety
What changes when you service R-454B, the A2L that replaced R-410A in many new systems, from glide and liquid charging to A2L tools and leak sensors.
Superheat vs. Subcooling: What Each Tells You and When to Charge by Which
What superheat and subcooling measure, how to take them, which one to charge by for TXV and fixed-orifice systems, and how to read them together.