Refrigerant Oil Types Explained: POE vs PAG vs Mineral (2026)
Picking the wrong compressor oil can quietly wreck a system. A tech pours in mineral oil where POE oil belongs...
Tag Archives: R-134a
How to Read a Refrigerant PT Chart: Pressure, Temperature, Superheat & Subcooling
A pressure-temperature (PT) chart turns two measurements into a full system diagnosis. Learn saturation, how to read a PT chart step by step, superheat vs subcooling, and how temperature glide changes the rules for blends.