Pressure-Temperature Charts

Saturation P-T data for common refrigerants

Select Refrigerant

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

Pressure → Temperature

kgf/cm²

Temperature → Pressure

* Results are interpolated from the P-T table data

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	kgf/cm²
-50	-58	0.9
-45	-49	1.3
-40	-40	1.8
-35	-31	2.3
-30	-22	2.9
-25	-13	3.6
-20	-4	4.4
-17.8	0	4.8
-15	5	5.3
-10	14	6.3
-5	23	7.4
0	32	8.6
5	41	10.0
10	50	11.5
15	59	13.2
20	68	15.0
25	77	17.0
30	86	19.1
35	95	21.4
40	104	24.0
45	113	26.7
50	122	29.6
55	131	32.8
60	140	36.2

Bubble Point (Liquid)

Used for liquid line / condenser

°C	°F	kgf/cm²
-50	-58	1.3
-45	-49	1.8
-40	-40	2.3
-35	-31	2.9
-30	-22	3.6
-25	-13	4.4
-20	-4	5.3
-17.8	0	5.8
-15	5	6.3
-10	14	7.4
-5	23	8.7
0	32	10.0
5	41	11.6
10	50	13.2
15	59	15.0
20	68	17.0
25	77	19.2
30	86	21.5
35	95	24.1
40	104	26.8
45	113	29.8
50	122	33.0
55	131	36.5
60	140	40.2

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