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

kgf/cm²

* 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 kgf/cm²
-50 -58 0.4
-45 -49 0.6
-40 -40 0.7
-35 -31 1.0
-30 -22 1.2
-25 -13 1.6
-20 -4 1.9
-15 5 2.4
-10 14 3.0
-5 23 3.6
0 32 4.4
5 41 5.3
10 50 6.3
15 59 7.4
20 68 8.7
25 77 10.2
30 86 11.9
35 95 13.8
40 104 15.9
45 113 18.2
50 122 20.8
55 131 23.6
60 140 26.7
65 149 30.2
70 158 33.9