R-424A PT Chart

R-424A saturation pressure, −40 to 150 °F−40 to 65 °C. Used in R-22 retrofits (RS-44b).

How to use ↓

Safety class A1Zeotropic blendGlide 7.81 °F at 40 °F evapGlide 4.34 K at 4.4 °C evap

PT lookup

Step 1 Refrigerant

Step 2 I know the

Temperature Pressure

Step 3 Temperature

°F°C

Type a temperature to see the saturation pressure.

R-424A pressure temperature table

Liquid = bubble (subcooling). Vapor = dew (superheat). Below 0 psig: inches of mercury vacuum. Highlighted: 40 °F and 100 °F.Liquid = bubble (subcooling). Vapor = dew (superheat). Negative kPa = vacuum. Highlighted: 4 °C and 38 °C.

R-424A saturation pressure by temperature, °F and psig (vacuum in inches of mercury)
°F	Liquid bubble, psig	Vapor dew, psig
-40	0.4 inHg	7.3 inHg
-39	0.2	6.6 inHg
-38	0.6	6.0 inHg
-37	1.0	5.3 inHg
-36	1.4	4.6 inHg
-35	1.8	3.9 inHg
-34	2.2	3.2 inHg
-33	2.7	2.5 inHg
-32	3.1	1.7 inHg
-31	3.5	0.9 inHg
-30	4.0	0.1 inHg
-29	4.5	0.3
-28	4.9	0.7
-27	5.4	1.1
-26	5.9	1.6
-25	6.4	2.0
-24	6.9	2.4
-23	7.4	2.9
-22	8.0	3.3
-21	8.5	3.8
-20	9.1	4.3
-19	9.6	4.7
-18	10.2	5.2
-17	10.8	5.7
-16	11.4	6.2
-15	12.0	6.8
-14	12.6	7.3
-13	13.2	7.8
-12	13.8	8.4
-11	14.5	9.0
-10	15.1	9.5
-9	15.8	10.1
-8	16.5	10.7
-7	17.2	11.3
-6	17.9	11.9
-5	18.6	12.6
-4	19.3	13.2
-3	20.1	13.8
-2	20.8	14.5
-1	21.6	15.2
0	22.3	15.9
1	23.1	16.6
2	23.9	17.3
3	24.7	18.0
4	25.6	18.7
5	26.4	19.5
6	27.3	20.2
7	28.1	21.0
8	29.0	21.8
9	29.9	22.6
10	30.8	23.4
11	31.7	24.2
12	32.7	25.1
13	33.6	25.9
14	34.6	26.8
15	35.6	27.7
16	36.6	28.6
17	37.6	29.5
18	38.6	30.4
19	39.6	31.4
20	40.7	32.3
21	41.7	33.3
22	42.8	34.3
23	43.9	35.3
24	45.1	36.3
25	46.2	37.3
26	47.3	38.4
27	48.5	39.4
28	49.7	40.5
29	50.9	41.6
30	52.1	42.7
31	53.3	43.9
32	54.6	45.0
33	55.9	46.2
34	57.1	47.4
35	58.4	48.6
36	59.8	49.8
37	61.1	51.0
38	62.5	52.3
39	63.8	53.5
40	65.2	54.8
41	66.6	56.1
42	68.1	57.5
43	69.5	58.8
44	71.0	60.2
45	72.5	61.5
46	74.0	62.9
47	75.5	64.4
48	77.0	65.8
49	78.6	67.3
50	80.2	68.7
51	81.8	70.2
52	83.4	71.8
53	85.1	73.3
54	86.7	74.9
55	88.4	76.4
56	90.1	78.0
57	91.9	79.7
58	93.6	81.3
59	95.4	83.0
60	97.2	84.7
61	99.0	86.4
62	100.8	88.1
63	102.7	89.9
64	104.6	91.6
65	106.5	93.5
66	108.4	95.3
67	110.4	97.1
68	112.3	99.0
69	114.3	100.9
70	116.4	102.8
71	118.4	104.7
72	120.5	106.7
73	122.6	108.7
74	124.7	110.7
75	126.8	112.8
76	129.0	114.8
77	131.2	116.9
78	133.4	119.0
79	135.6	121.2
80	137.9	123.3
81	140.2	125.5
82	142.5	127.7
83	144.8	130.0
84	147.2	132.2
85	149.6	134.5
86	152.0	136.9
87	154.5	139.2
88	156.9	141.6
89	159.4	144.0
90	162.0	146.4
91	164.5	148.9
92	167.1	151.4
93	169.7	153.9
94	172.3	156.5
95	175.0	159.0
96	177.7	161.7
97	180.4	164.3
98	183.2	167.0
99	185.9	169.7
100	188.8	172.4
101	191.6	175.1
102	194.5	177.9
103	197.4	180.7
104	200.3	183.6
105	203.2	186.5
106	206.2	189.4
107	209.2	192.3
108	212.3	195.3
109	215.4	198.3
110	218.5	201.4
111	221.6	204.4
112	224.8	207.5
113	228.0	210.7
114	231.2	213.8
115	234.5	217.1
116	237.8	220.3
117	241.1	223.6
118	244.5	226.9
119	247.9	230.2
120	251.3	233.6
121	254.8	237.0
122	258.3	240.5
123	261.8	244.0
124	265.4	247.5
125	269.0	251.1
126	272.6	254.7
127	276.3	258.3
128	280.0	262.0
129	283.7	265.7
130	287.5	269.4
131	291.3	273.2
132	295.2	277.0
133	299.0	280.9
134	303.0	284.8
135	306.9	288.7
136	310.9	292.7
137	314.9	296.7
138	319.0	300.8
139	323.1	304.9
140	327.2	309.0
141	331.4	313.2
142	335.6	317.5
143	339.9	321.7
144	344.2	326.0
145	348.5	330.4
146	352.9	334.8
147	357.3	339.2
148	361.8	343.7
149	366.3	348.2
150	370.8	352.8

R-424A saturation pressure by temperature, °C and kPa (negative = vacuum)
°C	Liquid bubble, kPa	Vapor dew, kPa
-40	-1.2	-24.7
-39	3.6	-20.7
-38	8.5	-16.6
-37	13.6	-12.3
-36	18.9	-7.8
-35	24.4	-3.1
-34	30.1	1.7
-33	36.0	6.7
-32	42.2	11.9
-31	48.5	17.3
-30	55.0	22.9
-29	61.7	28.7
-28	68.7	34.7
-27	75.9	40.9
-26	83.3	47.4
-25	91.0	54.1
-24	98.9	61.0
-23	107.1	68.1
-22	115.5	75.5
-21	124.2	83.1
-20	133.2	91.0
-19	142.4	99.1
-18	151.9	107.5
-17	161.6	116.2
-16	171.7	125.1
-15	182.1	134.3
-14	192.7	143.8
-13	203.7	153.6
-12	214.9	163.7
-11	226.5	174.1
-10	238.4	184.8
-9	250.6	195.9
-8	263.2	207.2
-7	276.1	218.9
-6	289.3	230.9
-5	302.9	243.3
-4	316.9	256.0
-3	331.2	269.0
-2	345.9	282.4
-1	360.9	296.2
0	376.3	310.4
1	392.2	324.9
2	408.4	339.8
3	425.0	355.1
4	442.0	370.9
5	459.4	387.0
6	477.2	403.5
7	495.5	420.5
8	514.2	437.9
9	533.3	455.7
10	552.9	473.9
11	572.9	492.7
12	593.4	511.8
13	614.4	531.5
14	635.8	551.6
15	657.7	572.1
16	680.1	593.2
17	702.9	614.8
18	726.3	636.8
19	750.2	659.4
20	774.6	682.5
21	799.5	706.1
22	824.9	730.3
23	850.9	755.0
24	877.4	780.2
25	904.4	806.0
26	932.0	832.4
27	960.2	859.3
28	988.9	886.9
29	1018.2	915.0
30	1048.1	943.7
31	1078.6	973.0
32	1109.7	1003.0
33	1141.4	1033.5
34	1173.7	1064.7
35	1206.6	1096.6
36	1240.2	1129.1
37	1274.4	1162.2
38	1309.2	1196.1
39	1344.7	1230.6
40	1380.9	1265.8
41	1417.7	1301.7
42	1455.2	1338.3
43	1493.4	1375.7
44	1532.3	1413.7
45	1571.9	1452.6
46	1612.2	1492.1
47	1653.3	1532.4
48	1695.0	1573.5
49	1737.5	1615.4
50	1780.8	1658.1
51	1824.8	1701.6
52	1869.5	1745.8
53	1915.1	1790.9
54	1961.4	1836.9
55	2008.5	1883.7
56	2056.4	1931.4
57	2105.1	1979.9
58	2154.7	2029.3
59	2205.1	2079.6
60	2256.3	2130.8
61	2308.3	2182.9
62	2361.2	2236.0
63	2415.0	2290.0
64	2469.7	2345.0
65	2525.3	2400.9

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R-424A PT Chart

°F / psig · Safety class A1 · Zeotropic blend

refrigerantptchart.com

°F	Liquid	Vapor
-40	0.4"	7.3"
-39	0.2	6.6"
-38	0.6	6.0"
-37	1.0	5.3"
-36	1.4	4.6"
-35	1.8	3.9"
-34	2.2	3.2"
-33	2.7	2.5"
-32	3.1	1.7"
-31	3.5	0.9"
-30	4.0	0.1"
-29	4.5	0.3
-28	4.9	0.7
-27	5.4	1.1
-26	5.9	1.6
-25	6.4	2.0
-24	6.9	2.4
-23	7.4	2.9
-22	8.0	3.3
-21	8.5	3.8
-20	9.1	4.3
-19	9.6	4.7
-18	10.2	5.2
-17	10.8	5.7
-16	11.4	6.2
-15	12.0	6.8
-14	12.6	7.3
-13	13.2	7.8
-12	13.8	8.4
-11	14.5	9.0
-10	15.1	9.5
-9	15.8	10.1
-8	16.5	10.7
-7	17.2	11.3
-6	17.9	11.9
-5	18.6	12.6
-4	19.3	13.2
-3	20.1	13.8
-2	20.8	14.5
-1	21.6	15.2
0	22.3	15.9
1	23.1	16.6
2	23.9	17.3
3	24.7	18.0
4	25.6	18.7
5	26.4	19.5
6	27.3	20.2
7	28.1	21.0

°F	Liquid	Vapor
8	29.0	21.8
9	29.9	22.6
10	30.8	23.4
11	31.7	24.2
12	32.7	25.1
13	33.6	25.9
14	34.6	26.8
15	35.6	27.7
16	36.6	28.6
17	37.6	29.5
18	38.6	30.4
19	39.6	31.4
20	40.7	32.3
21	41.7	33.3
22	42.8	34.3
23	43.9	35.3
24	45.1	36.3
25	46.2	37.3
26	47.3	38.4
27	48.5	39.4
28	49.7	40.5
29	50.9	41.6
30	52.1	42.7
31	53.3	43.9
32	54.6	45.0
33	55.9	46.2
34	57.1	47.4
35	58.4	48.6
36	59.8	49.8
37	61.1	51.0
38	62.5	52.3
39	63.8	53.5
40	65.2	54.8
41	66.6	56.1
42	68.1	57.5
43	69.5	58.8
44	71.0	60.2
45	72.5	61.5
46	74.0	62.9
47	75.5	64.4
48	77.0	65.8
49	78.6	67.3
50	80.2	68.7
51	81.8	70.2
52	83.4	71.8
53	85.1	73.3
54	86.7	74.9
55	88.4	76.4

°F	Liquid	Vapor
56	90.1	78.0
57	91.9	79.7
58	93.6	81.3
59	95.4	83.0
60	97.2	84.7
61	99.0	86.4
62	100.8	88.1
63	102.7	89.9
64	104.6	91.6
65	106.5	93.5
66	108.4	95.3
67	110.4	97.1
68	112.3	99.0
69	114.3	100.9
70	116.4	102.8
71	118.4	104.7
72	120.5	106.7
73	122.6	108.7
74	124.7	110.7
75	126.8	112.8
76	129.0	114.8
77	131.2	116.9
78	133.4	119.0
79	135.6	121.2
80	137.9	123.3
81	140.2	125.5
82	142.5	127.7
83	144.8	130.0
84	147.2	132.2
85	149.6	134.5
86	152.0	136.9
87	154.5	139.2
88	156.9	141.6
89	159.4	144.0
90	162.0	146.4
91	164.5	148.9
92	167.1	151.4
93	169.7	153.9
94	172.3	156.5
95	175.0	159.0
96	177.7	161.7
97	180.4	164.3
98	183.2	167.0
99	185.9	169.7
100	188.8	172.4
101	191.6	175.1
102	194.5	177.9
103	197.4	180.7

°F	Liquid	Vapor
104	200.3	183.6
105	203.2	186.5
106	206.2	189.4
107	209.2	192.3
108	212.3	195.3
109	215.4	198.3
110	218.5	201.4
111	221.6	204.4
112	224.8	207.5
113	228.0	210.7
114	231.2	213.8
115	234.5	217.1
116	237.8	220.3
117	241.1	223.6
118	244.5	226.9
119	247.9	230.2
120	251.3	233.6
121	254.8	237.0
122	258.3	240.5
123	261.8	244.0
124	265.4	247.5
125	269.0	251.1
126	272.6	254.7
127	276.3	258.3
128	280.0	262.0
129	283.7	265.7
130	287.5	269.4
131	291.3	273.2
132	295.2	277.0
133	299.0	280.9
134	303.0	284.8
135	306.9	288.7
136	310.9	292.7
137	314.9	296.7
138	319.0	300.8
139	323.1	304.9
140	327.2	309.0
141	331.4	313.2
142	335.6	317.5
143	339.9	321.7
144	344.2	326.0
145	348.5	330.4
146	352.9	334.8
147	357.3	339.2
148	361.8	343.7
149	366.3	348.2
150	370.8	352.8

Liquid = bubble (use for subcooling). Vapor = dew (use for superheat). Italic " = inches of mercury vacuum. Bold rows: 40 °F and 100 °F. Reference only: always verify with the manufacturer’s data and your gauges.

R-424A PT Chart

°C / kPa (gauge) · Safety class A1 · Zeotropic blend

refrigerantptchart.com

°C	Liquid	Vapor
-40	-1.2	-24.7
-39	3.6	-20.7
-38	8.5	-16.6
-37	13.6	-12.3
-36	18.9	-7.8
-35	24.4	-3.1
-34	30.1	1.7
-33	36.0	6.7
-32	42.2	11.9
-31	48.5	17.3
-30	55.0	22.9
-29	61.7	28.7
-28	68.7	34.7
-27	75.9	40.9
-26	83.3	47.4
-25	91.0	54.1
-24	98.9	61.0
-23	107.1	68.1
-22	115.5	75.5
-21	124.2	83.1
-20	133.2	91.0
-19	142.4	99.1
-18	151.9	107.5
-17	161.6	116.2
-16	171.7	125.1
-15	182.1	134.3
-14	192.7	143.8
-13	203.7	153.6
-12	214.9	163.7
-11	226.5	174.1
-10	238.4	184.8
-9	250.6	195.9
-8	263.2	207.2
-7	276.1	218.9
-6	289.3	230.9
-5	302.9	243.3

°C	Liquid	Vapor
-4	316.9	256.0
-3	331.2	269.0
-2	345.9	282.4
-1	360.9	296.2
0	376.3	310.4
1	392.2	324.9
2	408.4	339.8
3	425.0	355.1
4	442.0	370.9
5	459.4	387.0
6	477.2	403.5
7	495.5	420.5
8	514.2	437.9
9	533.3	455.7
10	552.9	473.9
11	572.9	492.7
12	593.4	511.8
13	614.4	531.5
14	635.8	551.6
15	657.7	572.1
16	680.1	593.2
17	702.9	614.8
18	726.3	636.8
19	750.2	659.4
20	774.6	682.5
21	799.5	706.1
22	824.9	730.3
23	850.9	755.0
24	877.4	780.2
25	904.4	806.0
26	932.0	832.4
27	960.2	859.3
28	988.9	886.9
29	1018.2	915.0
30	1048.1	943.7
31	1078.6	973.0

°C	Liquid	Vapor
32	1109.7	1003.0
33	1141.4	1033.5
34	1173.7	1064.7
35	1206.6	1096.6
36	1240.2	1129.1
37	1274.4	1162.2
38	1309.2	1196.1
39	1344.7	1230.6
40	1380.9	1265.8
41	1417.7	1301.7
42	1455.2	1338.3
43	1493.4	1375.7
44	1532.3	1413.7
45	1571.9	1452.6
46	1612.2	1492.1
47	1653.3	1532.4
48	1695.0	1573.5
49	1737.5	1615.4
50	1780.8	1658.1
51	1824.8	1701.6
52	1869.5	1745.8
53	1915.1	1790.9
54	1961.4	1836.9
55	2008.5	1883.7
56	2056.4	1931.4
57	2105.1	1979.9
58	2154.7	2029.3
59	2205.1	2079.6
60	2256.3	2130.8
61	2308.3	2182.9
62	2361.2	2236.0
63	2415.0	2290.0
64	2469.7	2345.0
65	2525.3	2400.9

Liquid = bubble (use for subcooling). Vapor = dew (use for superheat). Negative kPa = vacuum. Bold rows: 4 °C and 38 °C. Reference only: always verify with the manufacturer’s data and your gauges.

How to use

Choose Temperature or Pressure and type the number. The answer shows straight away.
Blends show two values: use vapor (dew) for superheat and liquid (bubble) for subcooling.
Tap °C · kPa for metric. Below 0 psig, pressure is in inches of mercury (inHg) vacuum.
Press Print pocket chart for a one-page chart (Letter or A4) for the van or the tool bag.

About this R-424A chart

This R-424A pressure temperature chart gives the saturation pressure for every degree, in psig with °F or kPa (gauge) with °C. As a blend, it has a liquid (bubble) and a vapor (dew) column. Below 0 psig the °F table shows inches of mercury (inHg) vacuum.

Source: supplier chart (). Reference only: always verify with the manufacturer’s data and your gauges.

FAQ

What is the R-424A pressure at 40 °F?

54.8 psig vapor (dew) and 65.2 psig liquid (bubble) at saturation, from the table above.

What is the R-424A pressure at 100 °F?

172.4 psig vapor (dew) and 188.8 psig liquid (bubble) at saturation.

Which column do I use for superheat and subcooling?

Use vapor (dew) for superheat and liquid (bubble) for subcooling. R-424A has 7.81 °F of glide at a 40 °F evaporator, so the two columns differ.

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R-424A PT Chart

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R-424A pressure temperature table

How to use

About this R-424A chart

FAQ

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