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In this conversation, we're covering the basics of TXV's (thermostatic expansion valves) and superheat with longtime tech, teacher and Refrigeration Mentor Community Ambassador, Andrew Freeburg. We breakdown the purpose of superheat, how to measure it, and variations between different applications and manufacturer specs. We also discuss different supermarket conditions, proper TXV adjustments and service tips every refrigeration technician needs to know to thoroughly understand these important system components.

In this episode, we cover:

(02:08) Superheat Basics Explained

(04:04) Measuring Superheat

(05:25) Target Superheat Ranges

(14:19) When To Adjust TXVs

(17:32) TXV Types And Selection

(19:00) How A TXV Works

(25:44) Bulb Placement

(28:32) Equalizer Line Placement

(29:30) Equalizer Tube Oil Seal Story

(31:10) Bulb Mounting and Insulation

(37:18) Low Temp Startup and Pull Down

(40:35) Cold Capillary Tube Failures

(45:04) Refrigerant Glide and Dew Point

Helpful Links & Resources:

Episode 16. TXV/TEV - A discussion about Thermostatic Expansion Valves

Episode 279. CO2 Experts: Superheat - Controls & Common Issues with Chris Griffiths and John Rothery

Episode 324.  Using AI To Learn and Troubleshoot Refrigeration Systems

Episode 350. Supermarket Refrigeration Tips and Tricks with Robert Ochs