Ty breaks down subcooling, flash gas, and why a small percentage of liquid refrigerant has to sacrifice itself (turning to vapor) so the rest of the charge can drop from a hot liquid down to a cold saturated mixture almost instantly. From there, the group gets into how a TXV modulates to hold a constant superheat — and why it does NOT control suction pressure, no matter how often that gets blamed for a low-charge or airflow problem.

What’s covered in this session:

• Refrigeration cycle review — compressor, condenser, subcooling, metering device, evaporator, superheat
• Why liquid refrigerant flashes off and absorbs heat at the metering device
• How boiling refrigerant absorbs heat from the air (and why boiling is a cooling effect)
• TXV operation, constant superheat, and common misdiagnoses
• Sensing bulb placement, insulation, and mounting mistakes
• Airflow measurement tools — Digital TrueFlow® Grid, DG-8 PRESSURE GAUGE, static pressure, and Measure Quick integrations
• How airflow and humidity affect delta T, subcooling, and superheat
• Compressor performance, compression ratio, and manufacturer performance data
• TD vs Delta T vs TDA/CTOA — clearing up the confusion between the terms

This is a great refresher whether you’re new to the trade or you just want to sharpen how you explain the cycle to an apprentice. Understanding airflow, subcooling, and superheat together — instead of chasing one number in isolation — is what separates a real diagnosis from a guess.