Pressure-Temperature Charts

Saturation P-T data for common refrigerants

Select Refrigerant

R-407C

Zeotropic

GWP: 1,774

ODP: 0

Temperature Glide: 7°C

Quick P-T Lookup

Pressure → Temperature

bar

Temperature → Pressure

* Results are interpolated from the P-T table data

Zeotropic Blend

This refrigerant has a temperature glide of 7°C - use the correct saturation point!

Temperature Glide Visualization

Dew Point

100% Vapor

For Superheat

7°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-407C with 7°C glide, this error can significantly affect diagnosis and charging.

Dew Point (Vapor)

Used for suction line / evaporator

°C	°F	bar
-40	-40	1.3
-35	-31	1.7
-30	-22	2.2
-25	-13	2.8
-20	-4	3.4
-15	5	4.2
-10	14	5.0
-5	23	6.0
0	32	7.0
5	41	8.2
10	50	9.5
15	59	11.0
20	68	12.6
25	77	14.3
30	86	16.2
35	95	18.2
40	104	20.5
45	113	22.9
50	122	25.5
55	131	28.3
60	140	31.3

Bubble Point (Liquid)

Used for liquid line / condenser

°C	°F	bar
-40	-40	0.8
-35	-31	1.2
-30	-22	1.6
-25	-13	2.1
-20	-4	2.7
-15	5	3.3
-10	14	4.1
-5	23	4.9
0	32	5.8
5	41	6.8
10	50	8.0
15	59	9.3
20	68	10.7
25	77	12.2
30	86	13.9
35	95	15.7
40	104	17.7
45	113	19.8
50	122	22.2
55	131	24.7
60	140	27.4

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