HVAC Toolkit

Pressure-Temperature Charts

Saturation P-T data for common refrigerants

Select Refrigerant

HFC / HCFC

R-22 R-32 R-125 R-134a R-143a R-404A Z R-407C Z R-410A R-507A

Low GWP (HFO)

R-449A Z R-454B Z Low GWP R-513A R-1234yf Low GWP R-1234ze(E) Low GWP

Natural

R-290 (Propane) Low GWP R-600a (Isobutane) Low GWP R-744 (CO2) Low GWP R-717 (NH3) Low GWP

Pressure Unit

psig kPa bar kgf/cm²

R-449A

Zeotropic
GWP: 1,397
ODP: 0
Safety Class: A1
Temperature Glide: 6°C

Retrofit replacement for R-404A/R-507A. Lower discharge temp than R-404A. Requires POE oil. Use dew point for superheat, bubble point for subcooling.

Quick P-T Lookup

kPa

* Results are interpolated from the P-T table data

Z

Zeotropic Blend

This refrigerant has a temperature glide of 6°C - use the correct saturation point!

Temperature Glide Visualization

Dew Point
100% Vapor
For Superheat
6°C Glide
Higher Temp Lower Temp
Bubble Point
100% Liquid
For Subcooling

DEW Suction Side / Superheat

  • • Superheat = Suction Temp - Dew Point Temp
  • • Use at evaporator outlet
  • • Low pressure gauge reading
  • • Temperature where last liquid evaporates

BUBBLE Liquid Side / Subcooling

  • • Subcooling = Bubble Point Temp - Liquid Temp
  • • Use at condenser outlet
  • • High pressure gauge reading
  • • Temperature where first bubble forms

Important: Using the wrong saturation point will give incorrect superheat/subcooling readings. For R-449A with 6°C glide, this error can significantly affect diagnosis and charging.

Dew Point (Vapor)

Used for suction line / evaporator

°C °F kPa
-50 -58 86.0
-45 -49 126.0
-40 -40 172.0
-35 -31 224.0
-30 -22 284.0
-25 -13 352.0
-20 -4 430.0
-17.8 0 473.0
-15 5 517.0
-10 14 615.0
-5 23 724.0
0 32 846.0
5 41 980.0
10 50 1,128.0
15 59 1,290.0
20 68 1,468.0
25 77 1,662.0
30 86 1,873.0
35 95 2,102.0
40 104 2,350.0
45 113 2,618.0
50 122 2,906.0
55 131 3,216.0
60 140 3,550.0

Bubble Point (Liquid)

Used for liquid line / condenser

°C °F kPa
-50 -58 130.0
-45 -49 176.0
-40 -40 228.0
-35 -31 288.0
-30 -22 356.0
-25 -13 434.0
-20 -4 521.0
-17.8 0 572.0
-15 5 618.0
-10 14 727.0
-5 23 849.0
0 32 984.0
5 41 1,132.0
10 50 1,295.0
15 59 1,474.0
20 68 1,668.0
25 77 1,880.0
30 86 2,111.0
35 95 2,360.0
40 104 2,630.0
45 113 2,921.0
50 122 3,235.0
55 131 3,574.0
60 140 3,939.0

Pressure Units: psig = Gauge pressure (relative to atmosphere) kPa / bar / kgf/cm² = Absolute pressure