Refrigerant 101: Glide, Blends & Why You Can’t Mix Refrigerants

Ty walks through the difference between 400-series zeotropic blends and 500-series azeotropic blends, why some refrigerants have near-zero glide while others have a huge one, and how measureQuick calculates superheat off the dew point instead of the midpoint saturation number most gauges show you. You’ll also see a live glide calculation pulled straight from a pressure/temperature chart, plus a real-world discussion on spotting a contaminated or mixed-refrigerant system in the field — including why a sight glass can catch flashing that your gauges alone will miss.

If you’ve ever had a system where your superheat and subcooling numbers “look fine” but something still feels off, this one’s for you.

What’s covered:

• 400 vs 500 series refrigerants — what makes something a blend
• Glide explained: bubble point, dew point, and midpoint
• Why R438A has such a dramatic glide compared to R410A
• How fractionation happens as a blend boils off in the coil
• Why you must charge blended refrigerants as a liquid, not vapor
• measureQuick’s superheat calculation vs. midpoint saturation
• Live glide calculation walkthrough on R454B
• Real signs of a mixed or contaminated refrigerant system
• Using a sight glass to catch flashing and confirm subcooled liquid
• Why oil return matters in blends like R410A and R454B