R-401A PT Chart

R-401A saturation pressure, −40 to 150 °F−40 to 65 °C. Used in R-12 retrofits (MP39).

How to use ↓

Safety class A1Zeotropic blendGlide 9.45 °F at 40 °F evapGlide 5.25 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-401A 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-401A saturation pressure by temperature, °F and psig (vacuum in inches of mercury)
°F	Liquid bubble, psig	Vapor dew, psig
-40	8.3 inHg	13.8 inHg
-39	7.8 inHg	13.4 inHg
-38	7.2 inHg	12.9 inHg
-37	6.6 inHg	12.4 inHg
-36	6.0 inHg	11.9 inHg
-35	5.3 inHg	11.4 inHg
-34	4.7 inHg	10.9 inHg
-33	4.0 inHg	10.3 inHg
-32	3.3 inHg	9.8 inHg
-31	2.7 inHg	9.2 inHg
-30	2.0 inHg	8.6 inHg
-29	1.3 inHg	8.1 inHg
-28	0.5 inHg	7.5 inHg
-27	0.1	6.9 inHg
-26	0.5	6.2 inHg
-25	0.9	5.6 inHg
-24	1.2	5.0 inHg
-23	1.6	4.3 inHg
-22	2.0	3.6 inHg
-21	2.4	2.9 inHg
-20	2.9	2.2 inHg
-19	3.3	1.5 inHg
-18	3.7	0.8 inHg
-17	4.2	0.0
-16	4.6	0.4
-15	5.1	0.7
-14	5.5	1.1
-13	6.0	1.5
-12	6.5	1.9
-11	7.0	2.3
-10	7.5	2.8
-9	8.0	3.2
-8	8.5	3.6
-7	9.0	4.1
-6	9.6	4.5
-5	10.1	5.0
-4	10.7	5.5
-3	11.2	5.9
-2	11.8	6.4
-1	12.4	6.9
0	13.0	7.4
1	13.6	7.9
2	14.2	8.5
3	14.8	9.0
4	15.5	9.5
5	16.1	10.1
6	16.8	10.7
7	17.4	11.2
8	18.1	11.8
9	18.8	12.4
10	19.5	13.0
11	20.2	13.6
12	20.9	14.3
13	21.7	14.9
14	22.4	15.5
15	23.2	16.2
16	23.9	16.9
17	24.7	17.5
18	25.5	18.2
19	26.3	18.9
20	27.1	19.6
21	27.9	20.4
22	28.8	21.1
23	29.6	21.9
24	30.5	22.6
25	31.4	23.4
26	32.3	24.2
27	33.2	25.0
28	34.1	25.8
29	35.0	26.6
30	36.0	27.4
31	36.9	28.3
32	37.9	29.1
33	38.9	30.0
34	39.9	30.9
35	40.9	31.8
36	41.9	32.7
37	43.0	33.6
38	44.0	34.6
39	45.1	35.5
40	46.2	36.5
41	47.3	37.5
42	48.4	38.5
43	49.5	39.5
44	50.7	40.5
45	51.8	41.6
46	53.0	42.6
47	54.2	43.7
48	55.4	44.8
49	56.6	45.9
50	57.9	47.0
51	59.1	48.1
52	60.4	49.3
53	61.7	50.4
54	63.0	51.6
55	64.3	52.8
56	65.7	54.0
57	67.0	55.2
58	68.4	56.5
59	69.8	57.7
60	71.2	59.0
61	72.6	60.3
62	74.1	61.6
63	75.5	63.0
64	77.0	64.3
65	78.5	65.7
66	80.0	67.1
67	81.6	68.5
68	83.1	69.9
69	84.7	71.3
70	86.3	72.8
71	87.9	74.2
72	89.5	75.7
73	91.1	77.3
74	92.8	78.8
75	94.5	80.3
76	96.2	81.9
77	97.9	83.5
78	99.7	85.1
79	101.4	86.7
80	103.2	88.4
81	105.0	90.0
82	106.8	91.7
83	108.7	93.4
84	110.5	95.2
85	112.4	96.9
86	114.3	98.7
87	116.3	100.5
88	118.2	102.3
89	120.2	104.1
90	122.2	106.0
91	124.2	107.8
92	126.2	109.7
93	128.3	111.7
94	130.4	113.6
95	132.5	115.6
96	134.6	117.6
97	136.7	119.6
98	138.9	121.6
99	141.1	123.7
100	143.3	125.7
101	145.6	127.8
102	147.8	130.0
103	150.1	132.1
104	152.4	134.3
105	154.7	136.5
106	157.1	138.7
107	159.5	141.0
108	161.9	143.2
109	164.3	145.5
110	166.8	147.8
111	169.2	150.2
112	171.7	152.6
113	174.3	154.9
114	176.8	157.4
115	179.4	159.8
116	182.0	162.3
117	184.6	164.8
118	187.3	167.3
119	190.0	169.9
120	192.7	172.4
121	195.4	175.1
122	198.2	177.7
123	201.0	180.3
124	203.8	183.0
125	206.6	185.7
126	209.5	188.5
127	212.4	191.3
128	215.3	194.1
129	218.2	196.9
130	221.2	199.7
131	224.2	202.6
132	227.2	205.5
133	230.3	208.5
134	233.4	211.5
135	236.5	214.5
136	239.7	217.5
137	242.8	220.6
138	246.0	223.7
139	249.3	226.8
140	252.5	229.9
141	255.8	233.1
142	259.1	236.3
143	262.5	239.6
144	265.9	242.9
145	269.3	246.2
146	272.7	249.5
147	276.2	252.9
148	279.7	256.3
149	283.2	259.7
150	286.8	263.2

R-401A saturation pressure by temperature, °C and kPa (negative = vacuum)
°C	Liquid bubble, kPa	Vapor dew, kPa
-40	-28.3	-46.8
-39	-24.7	-43.9
-38	-21.0	-40.9
-37	-17.1	-37.8
-36	-13.2	-34.6
-35	-9.0	-31.2
-34	-4.7	-27.7
-33	-0.3	-24.1
-32	4.3	-20.3
-31	9.1	-16.3
-30	14.0	-12.3
-29	19.1	-8.0
-28	24.4	-3.6
-27	29.9	0.9
-26	35.5	5.6
-25	41.4	10.5
-24	47.4	15.6
-23	53.6	20.8
-22	60.1	26.2
-21	66.7	31.8
-20	73.5	37.6
-19	80.6	43.6
-18	87.9	49.8
-17	95.4	56.2
-16	103.1	62.8
-15	111.0	69.7
-14	119.2	76.7
-13	127.7	84.0
-12	136.3	91.5
-11	145.3	99.2
-10	154.4	107.1
-9	163.9	115.3
-8	173.6	123.8
-7	183.6	132.5
-6	193.8	141.4
-5	204.3	150.7
-4	215.2	160.2
-3	226.3	169.9
-2	237.6	180.0
-1	249.3	190.3
0	261.3	200.9
1	273.6	211.8
2	286.3	223.0
3	299.2	234.5
4	312.5	246.3
5	326.1	258.4
6	340.0	270.9
7	354.3	283.6
8	368.9	296.7
9	383.8	310.2
10	399.1	323.9
11	414.8	338.1
12	430.9	352.6
13	447.3	367.4
14	464.1	382.6
15	481.2	398.2
16	498.8	414.1
17	516.7	430.5
18	535.1	447.2
19	553.8	464.3
20	573.0	481.8
21	592.6	499.7
22	612.6	518.1
23	633.0	536.8
24	653.8	556.0
25	675.1	575.6
26	696.9	595.7
27	719.0	616.2
28	741.7	637.1
29	764.8	658.5
30	788.3	680.4
31	812.4	702.7
32	836.9	725.5
33	861.9	748.8
34	887.3	772.6
35	913.3	796.8
36	939.8	821.6
37	966.8	846.9
38	994.3	872.7
39	1022.3	899.0
40	1050.8	925.9
41	1079.9	953.3
42	1109.5	981.2
43	1139.6	1009.7
44	1170.3	1038.7
45	1201.6	1068.3
46	1233.4	1098.5
47	1265.8	1129.3
48	1298.7	1160.6
49	1332.2	1192.6
50	1366.3	1225.1
51	1401.0	1258.3
52	1436.3	1292.0
53	1472.3	1326.4
54	1508.8	1361.4
55	1545.9	1397.1
56	1583.7	1433.4
57	1622.1	1470.4
58	1661.1	1508.0
59	1700.8	1546.3
60	1741.1	1585.3
61	1782.0	1625.0
62	1823.7	1665.3
63	1866.0	1706.4
64	1909.0	1748.2
65	1952.7	1790.7

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R-401A PT Chart

°F / psig · Safety class A1 · Zeotropic blend

refrigerantptchart.com

°F	Liquid	Vapor
-40	8.3"	13.8"
-39	7.8"	13.4"
-38	7.2"	12.9"
-37	6.6"	12.4"
-36	6.0"	11.9"
-35	5.3"	11.4"
-34	4.7"	10.9"
-33	4.0"	10.3"
-32	3.3"	9.8"
-31	2.7"	9.2"
-30	2.0"	8.6"
-29	1.3"	8.1"
-28	0.5"	7.5"
-27	0.1	6.9"
-26	0.5	6.2"
-25	0.9	5.6"
-24	1.2	5.0"
-23	1.6	4.3"
-22	2.0	3.6"
-21	2.4	2.9"
-20	2.9	2.2"
-19	3.3	1.5"
-18	3.7	0.8"
-17	4.2	0.0
-16	4.6	0.4
-15	5.1	0.7
-14	5.5	1.1
-13	6.0	1.5
-12	6.5	1.9
-11	7.0	2.3
-10	7.5	2.8
-9	8.0	3.2
-8	8.5	3.6
-7	9.0	4.1
-6	9.6	4.5
-5	10.1	5.0
-4	10.7	5.5
-3	11.2	5.9
-2	11.8	6.4
-1	12.4	6.9
0	13.0	7.4
1	13.6	7.9
2	14.2	8.5
3	14.8	9.0
4	15.5	9.5
5	16.1	10.1
6	16.8	10.7
7	17.4	11.2

°F	Liquid	Vapor
8	18.1	11.8
9	18.8	12.4
10	19.5	13.0
11	20.2	13.6
12	20.9	14.3
13	21.7	14.9
14	22.4	15.5
15	23.2	16.2
16	23.9	16.9
17	24.7	17.5
18	25.5	18.2
19	26.3	18.9
20	27.1	19.6
21	27.9	20.4
22	28.8	21.1
23	29.6	21.9
24	30.5	22.6
25	31.4	23.4
26	32.3	24.2
27	33.2	25.0
28	34.1	25.8
29	35.0	26.6
30	36.0	27.4
31	36.9	28.3
32	37.9	29.1
33	38.9	30.0
34	39.9	30.9
35	40.9	31.8
36	41.9	32.7
37	43.0	33.6
38	44.0	34.6
39	45.1	35.5
40	46.2	36.5
41	47.3	37.5
42	48.4	38.5
43	49.5	39.5
44	50.7	40.5
45	51.8	41.6
46	53.0	42.6
47	54.2	43.7
48	55.4	44.8
49	56.6	45.9
50	57.9	47.0
51	59.1	48.1
52	60.4	49.3
53	61.7	50.4
54	63.0	51.6
55	64.3	52.8

°F	Liquid	Vapor
56	65.7	54.0
57	67.0	55.2
58	68.4	56.5
59	69.8	57.7
60	71.2	59.0
61	72.6	60.3
62	74.1	61.6
63	75.5	63.0
64	77.0	64.3
65	78.5	65.7
66	80.0	67.1
67	81.6	68.5
68	83.1	69.9
69	84.7	71.3
70	86.3	72.8
71	87.9	74.2
72	89.5	75.7
73	91.1	77.3
74	92.8	78.8
75	94.5	80.3
76	96.2	81.9
77	97.9	83.5
78	99.7	85.1
79	101.4	86.7
80	103.2	88.4
81	105.0	90.0
82	106.8	91.7
83	108.7	93.4
84	110.5	95.2
85	112.4	96.9
86	114.3	98.7
87	116.3	100.5
88	118.2	102.3
89	120.2	104.1
90	122.2	106.0
91	124.2	107.8
92	126.2	109.7
93	128.3	111.7
94	130.4	113.6
95	132.5	115.6
96	134.6	117.6
97	136.7	119.6
98	138.9	121.6
99	141.1	123.7
100	143.3	125.7
101	145.6	127.8
102	147.8	130.0
103	150.1	132.1

°F	Liquid	Vapor
104	152.4	134.3
105	154.7	136.5
106	157.1	138.7
107	159.5	141.0
108	161.9	143.2
109	164.3	145.5
110	166.8	147.8
111	169.2	150.2
112	171.7	152.6
113	174.3	154.9
114	176.8	157.4
115	179.4	159.8
116	182.0	162.3
117	184.6	164.8
118	187.3	167.3
119	190.0	169.9
120	192.7	172.4
121	195.4	175.1
122	198.2	177.7
123	201.0	180.3
124	203.8	183.0
125	206.6	185.7
126	209.5	188.5
127	212.4	191.3
128	215.3	194.1
129	218.2	196.9
130	221.2	199.7
131	224.2	202.6
132	227.2	205.5
133	230.3	208.5
134	233.4	211.5
135	236.5	214.5
136	239.7	217.5
137	242.8	220.6
138	246.0	223.7
139	249.3	226.8
140	252.5	229.9
141	255.8	233.1
142	259.1	236.3
143	262.5	239.6
144	265.9	242.9
145	269.3	246.2
146	272.7	249.5
147	276.2	252.9
148	279.7	256.3
149	283.2	259.7
150	286.8	263.2

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-401A PT Chart

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

refrigerantptchart.com

°C	Liquid	Vapor
-40	-28.3	-46.8
-39	-24.7	-43.9
-38	-21.0	-40.9
-37	-17.1	-37.8
-36	-13.2	-34.6
-35	-9.0	-31.2
-34	-4.7	-27.7
-33	-0.3	-24.1
-32	4.3	-20.3
-31	9.1	-16.3
-30	14.0	-12.3
-29	19.1	-8.0
-28	24.4	-3.6
-27	29.9	0.9
-26	35.5	5.6
-25	41.4	10.5
-24	47.4	15.6
-23	53.6	20.8
-22	60.1	26.2
-21	66.7	31.8
-20	73.5	37.6
-19	80.6	43.6
-18	87.9	49.8
-17	95.4	56.2
-16	103.1	62.8
-15	111.0	69.7
-14	119.2	76.7
-13	127.7	84.0
-12	136.3	91.5
-11	145.3	99.2
-10	154.4	107.1
-9	163.9	115.3
-8	173.6	123.8
-7	183.6	132.5
-6	193.8	141.4
-5	204.3	150.7

°C	Liquid	Vapor
-4	215.2	160.2
-3	226.3	169.9
-2	237.6	180.0
-1	249.3	190.3
0	261.3	200.9
1	273.6	211.8
2	286.3	223.0
3	299.2	234.5
4	312.5	246.3
5	326.1	258.4
6	340.0	270.9
7	354.3	283.6
8	368.9	296.7
9	383.8	310.2
10	399.1	323.9
11	414.8	338.1
12	430.9	352.6
13	447.3	367.4
14	464.1	382.6
15	481.2	398.2
16	498.8	414.1
17	516.7	430.5
18	535.1	447.2
19	553.8	464.3
20	573.0	481.8
21	592.6	499.7
22	612.6	518.1
23	633.0	536.8
24	653.8	556.0
25	675.1	575.6
26	696.9	595.7
27	719.0	616.2
28	741.7	637.1
29	764.8	658.5
30	788.3	680.4
31	812.4	702.7

°C	Liquid	Vapor
32	836.9	725.5
33	861.9	748.8
34	887.3	772.6
35	913.3	796.8
36	939.8	821.6
37	966.8	846.9
38	994.3	872.7
39	1022.3	899.0
40	1050.8	925.9
41	1079.9	953.3
42	1109.5	981.2
43	1139.6	1009.7
44	1170.3	1038.7
45	1201.6	1068.3
46	1233.4	1098.5
47	1265.8	1129.3
48	1298.7	1160.6
49	1332.2	1192.6
50	1366.3	1225.1
51	1401.0	1258.3
52	1436.3	1292.0
53	1472.3	1326.4
54	1508.8	1361.4
55	1545.9	1397.1
56	1583.7	1433.4
57	1622.1	1470.4
58	1661.1	1508.0
59	1700.8	1546.3
60	1741.1	1585.3
61	1782.0	1625.0
62	1823.7	1665.3
63	1866.0	1706.4
64	1909.0	1748.2
65	1952.7	1790.7

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-401A chart

This R-401A 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: manufacturer and supplier charts (Honeywell, Arkema, National Refrigerants). Reference only: always verify with the manufacturer’s data and your gauges.

FAQ

What is the R-401A pressure at 40 °F?

36.5 psig vapor (dew) and 46.2 psig liquid (bubble) at saturation, from the table above.

What is the R-401A pressure at 100 °F?

125.7 psig vapor (dew) and 143.3 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-401A has 9.45 °F of glide at a 40 °F evaporator, so the two columns differ.

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R-401A PT Chart

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R-401A pressure temperature table

How to use

About this R-401A chart

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