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-717 (Ammonia)

Pure
GWP: 0
ODP: 0
Safety Class: B2L

Natural refrigerant with zero GWP. Excellent thermodynamic properties and high efficiency. Toxic and mildly flammable (B2L). Primarily used in industrial applications with proper safety measures. Strong odor provides self-warning for leaks.

Quick P-T Lookup

psig

* Results are interpolated from the P-T table data

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

°C °F psig
-50 -58 -5.4
-45 -49 -2.7
-40 -40 0.6
-35 -31 4.5
-30 -22 9.2
-25 -13 14.7
-20 -4 21.2
-15 5 28.7
-10 14 37.5
-5 23 47.5
0 32 58.9
5 41 71.9
10 50 86.6
15 59 103.2
20 68 121.9
25 77 143.0
30 86 166.4
35 95 192.6
40 104 221.6
45 113 253.6
50 122 289.0
55 131 327.8
60 140 370.4
65 149 417.0
70 158 467.9