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Refrigerant Reference Charts

Access pressure-temperature charts and pipe sizing guides for common refrigerants. These materials are essential for calculating superheat, subcooling, and ensuring proper refrigerant line sizing in HVAC systems.

R410A PT Chart

Pressure-Temperature relationship chart for R410A refrigerant. Essential for calculating superheat and subcooling in systems using R410A.

Use this chart to:

  • Calculate superheat at evaporator outlet
  • Calculate subcooling at condenser outlet
  • Verify proper refrigerant charge
Open R410A Chart

R407C PT Chart

Pressure-Temperature relationship chart for R407C refrigerant. Includes temperature glide information specific to this zeotropic blend.

Important Note: R407C has temperature glide, affecting superheat and subcooling calculations.

Open R407C Chart

Pipe Sizing Guide

Comprehensive refrigerant pipe sizing charts for R410A, R407C, and other common refrigerants.

Includes:

  • Suction line sizing by system capacity
  • Liquid line sizing by system capacity
  • Equivalent length calculations for fittings
  • Guidelines for proper installation
Open Pipe Sizing Guide

Understanding Superheat & Subcooling

Superheat

Superheat is the difference between the actual temperature of the refrigerant vapor and its saturation temperature at the same pressure.

How to Calculate Superheat:

  1. Measure the suction line pressure at the evaporator outlet.
  2. Convert this pressure to saturation temperature using the PT chart.
  3. Measure the actual temperature of the suction line at the same point.
  4. Subtract the saturation temperature from the actual temperature.

Typical Values: 8-12°F (4.4-6.7°C) for most fixed-orifice systems, 10-15°F (5.6-8.3°C) for TXV systems.

Subcooling

Subcooling is the difference between the saturation temperature of the refrigerant liquid and its actual temperature at the same pressure.

How to Calculate Subcooling:

  1. Measure the liquid line pressure at the condenser outlet.
  2. Convert this pressure to saturation temperature using the PT chart.
  3. Measure the actual temperature of the liquid line at the same point.
  4. Subtract the actual temperature from the saturation temperature.

Typical Values: 10-15°F (5.6-8.3°C) for most systems.