R-437A PT Chart

R-437A saturation pressure, −40 to 150 °F−40 to 65 °C. Used in R-12 retrofits (MO49Plus).

How to use ↓

Safety class A1Zeotropic blendGlide 5.08 °F at 40 °F evapGlide 2.82 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-437A 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-437A saturation pressure by temperature, °F and psig (vacuum in inches of mercury)
°F	Liquid bubble, psig	Vapor dew, psig
-40	9.0 inHg	12.5 inHg
-39	8.5 inHg	12.0 inHg
-38	7.9 inHg	11.5 inHg
-37	7.3 inHg	11.0 inHg
-36	6.7 inHg	10.4 inHg
-35	6.0 inHg	9.9 inHg
-34	5.4 inHg	9.3 inHg
-33	4.7 inHg	8.7 inHg
-32	4.1 inHg	8.1 inHg
-31	3.4 inHg	7.5 inHg
-30	2.7 inHg	6.9 inHg
-29	2.0 inHg	6.2 inHg
-28	1.2 inHg	5.6 inHg
-27	0.5 inHg	4.9 inHg
-26	0.1	4.2 inHg
-25	0.5	3.6 inHg
-24	0.9	2.8 inHg
-23	1.3	2.1 inHg
-22	1.7	1.4 inHg
-21	2.1	0.6 inHg
-20	2.5	0.1
-19	2.9	0.5
-18	3.4	0.8
-17	3.8	1.2
-16	4.3	1.7
-15	4.7	2.1
-14	5.2	2.5
-13	5.7	2.9
-12	6.2	3.4
-11	6.7	3.8
-10	7.2	4.3
-9	7.7	4.8
-8	8.2	5.2
-7	8.7	5.7
-6	9.3	6.2
-5	9.8	6.7
-4	10.4	7.2
-3	11.0	7.8
-2	11.6	8.3
-1	12.2	8.8
0	12.8	9.4
1	13.4	10.0
2	14.0	10.5
3	14.6	11.1
4	15.3	11.7
5	15.9	12.3
6	16.6	12.9
7	17.3	13.6
8	18.0	14.2
9	18.7	14.9
10	19.4	15.5
11	20.1	16.2
12	20.9	16.9
13	21.6	17.6
14	22.4	18.3
15	23.1	19.0
16	23.9	19.7
17	24.7	20.5
18	25.5	21.2
19	26.4	22.0
20	27.2	22.8
21	28.0	23.6
22	28.9	24.4
23	29.8	25.2
24	30.7	26.1
25	31.6	26.9
26	32.5	27.8
27	33.4	28.6
28	34.4	29.5
29	35.3	30.4
30	36.3	31.3
31	37.3	32.3
32	38.3	33.2
33	39.3	34.2
34	40.3	35.2
35	41.4	36.1
36	42.5	37.1
37	43.5	38.2
38	44.6	39.2
39	45.7	40.2
40	46.9	41.3
41	48.0	42.4
42	49.2	43.5
43	50.3	44.6
44	51.5	45.7
45	52.7	46.9
46	54.0	48.0
47	55.2	49.2
48	56.4	50.4
49	57.7	51.6
50	59.0	52.9
51	60.3	54.1
52	61.6	55.4
53	63.0	56.6
54	64.3	57.9
55	65.7	59.3
56	67.1	60.6
57	68.5	61.9
58	70.0	63.3
59	71.4	64.7
60	72.9	66.1
61	74.4	67.5
62	75.9	69.0
63	77.4	70.5
64	79.0	71.9
65	80.5	73.4
66	82.1	75.0
67	83.7	76.5
68	85.3	78.1
69	87.0	79.7
70	88.7	81.3
71	90.3	82.9
72	92.1	84.5
73	93.8	86.2
74	95.5	87.9
75	97.3	89.6
76	99.1	91.3
77	100.9	93.1
78	102.7	94.9
79	104.6	96.7
80	106.5	98.5
81	108.4	100.3
82	110.3	102.2
83	112.3	104.1
84	114.2	106.0
85	116.2	107.9
86	118.2	109.9
87	120.3	111.8
88	122.3	113.8
89	124.4	115.9
90	126.5	117.9
91	128.7	120.0
92	130.8	122.1
93	133.0	124.2
94	135.2	126.3
95	137.4	128.5
96	139.7	130.7
97	142.0	132.9
98	144.3	135.2
99	146.6	137.5
100	149.0	139.8
101	151.3	142.1
102	153.7	144.4
103	156.2	146.8
104	158.6	149.2
105	161.1	151.7
106	163.6	154.1
107	166.2	156.6
108	168.7	159.1
109	171.3	161.6
110	174.0	164.2
111	176.6	166.8
112	179.3	169.4
113	182.0	172.1
114	184.7	174.8
115	187.5	177.5
116	190.3	180.2
117	193.1	183.0
118	195.9	185.8
119	198.8	188.6
120	201.7	191.5
121	204.6	194.4
122	207.6	197.3
123	210.6	200.2
124	213.6	203.2
125	216.7	206.2
126	219.8	209.3
127	222.9	212.4
128	226.0	215.5
129	229.2	218.6
130	232.4	221.8
131	235.6	225.0
132	238.9	228.2
133	242.2	231.5
134	245.6	234.8
135	248.9	238.1
136	252.3	241.5
137	255.8	244.9
138	259.2	248.3
139	262.7	251.8
140	266.3	255.3
141	269.8	258.8
142	273.4	262.4
143	277.1	266.0
144	280.7	269.7
145	284.4	273.3
146	288.2	277.1
147	291.9	280.8
148	295.7	284.6
149	299.6	288.4
150	303.5	292.3

R-437A saturation pressure by temperature, °C and kPa (negative = vacuum)
°C	Liquid bubble, kPa	Vapor dew, kPa
-40	-30.6	-42.4
-39	-27.1	-39.2
-38	-23.4	-36.0
-37	-19.6	-32.6
-36	-15.6	-29.1
-35	-11.4	-25.4
-34	-7.1	-21.5
-33	-2.7	-17.6
-32	1.9	-13.4
-31	6.7	-9.1
-30	11.7	-4.7
-29	16.8	-0.1
-28	22.1	4.7
-27	27.6	9.7
-26	33.3	14.9
-25	39.2	20.2
-24	45.3	25.8
-23	51.6	31.5
-22	58.1	37.4
-21	64.8	43.6
-20	71.7	49.9
-19	78.9	56.5
-18	86.3	63.3
-17	93.9	70.3
-16	101.7	77.5
-15	109.8	85.0
-14	118.2	92.7
-13	126.8	100.7
-12	135.7	108.9
-11	144.8	117.4
-10	154.2	126.1
-9	163.8	135.1
-8	173.8	144.4
-7	184.0	153.9
-6	194.5	163.8
-5	205.4	173.9
-4	216.5	184.3
-3	227.9	195.0
-2	239.6	206.0
-1	251.7	217.4
0	264.1	229.0
1	276.8	241.0
2	289.8	253.3
3	303.2	266.0
4	316.9	279.0
5	331.0	292.3
6	345.4	306.0
7	360.2	320.0
8	375.4	334.4
9	390.9	349.2
10	406.8	364.4
11	423.2	380.0
12	439.9	395.9
13	457.0	412.2
14	474.5	429.0
15	492.4	446.1
16	510.8	463.7
17	529.5	481.7
18	548.7	500.1
19	568.4	519.0
20	588.5	538.3
21	609.0	558.1
22	630.0	578.3
23	651.4	599.0
24	673.4	620.2
25	695.8	641.8
26	718.6	663.9
27	742.0	686.5
28	765.9	709.7
29	790.3	733.3
30	815.2	757.4
31	840.6	782.1
32	866.5	807.3
33	893.0	833.0
34	920.0	859.3
35	947.5	886.1
36	975.6	913.5
37	1004.3	941.5
38	1033.5	970.0
39	1063.4	999.1
40	1093.7	1028.8
41	1124.7	1059.1
42	1156.3	1090.1
43	1188.5	1121.6
44	1221.3	1153.8
45	1254.7	1186.5
46	1288.7	1220.0
47	1323.4	1254.1
48	1358.8	1288.8
49	1394.7	1324.2
50	1431.4	1360.3
51	1468.7	1397.1
52	1506.6	1434.5
53	1545.3	1472.7
54	1584.7	1511.5
55	1624.7	1551.1
56	1665.5	1591.4
57	1707.0	1632.5
58	1749.2	1674.3
59	1792.1	1716.9
60	1835.8	1760.2
61	1880.2	1804.3
62	1925.4	1849.2
63	1971.4	1894.9
64	2018.1	1941.4
65	2065.6	1988.7

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R-437A PT Chart

°F / psig · Safety class A1 · Zeotropic blend

refrigerantptchart.com

°F	Liquid	Vapor
-40	9.0"	12.5"
-39	8.5"	12.0"
-38	7.9"	11.5"
-37	7.3"	11.0"
-36	6.7"	10.4"
-35	6.0"	9.9"
-34	5.4"	9.3"
-33	4.7"	8.7"
-32	4.1"	8.1"
-31	3.4"	7.5"
-30	2.7"	6.9"
-29	2.0"	6.2"
-28	1.2"	5.6"
-27	0.5"	4.9"
-26	0.1	4.2"
-25	0.5	3.6"
-24	0.9	2.8"
-23	1.3	2.1"
-22	1.7	1.4"
-21	2.1	0.6"
-20	2.5	0.1
-19	2.9	0.5
-18	3.4	0.8
-17	3.8	1.2
-16	4.3	1.7
-15	4.7	2.1
-14	5.2	2.5
-13	5.7	2.9
-12	6.2	3.4
-11	6.7	3.8
-10	7.2	4.3
-9	7.7	4.8
-8	8.2	5.2
-7	8.7	5.7
-6	9.3	6.2
-5	9.8	6.7
-4	10.4	7.2
-3	11.0	7.8
-2	11.6	8.3
-1	12.2	8.8
0	12.8	9.4
1	13.4	10.0
2	14.0	10.5
3	14.6	11.1
4	15.3	11.7
5	15.9	12.3
6	16.6	12.9
7	17.3	13.6

°F	Liquid	Vapor
8	18.0	14.2
9	18.7	14.9
10	19.4	15.5
11	20.1	16.2
12	20.9	16.9
13	21.6	17.6
14	22.4	18.3
15	23.1	19.0
16	23.9	19.7
17	24.7	20.5
18	25.5	21.2
19	26.4	22.0
20	27.2	22.8
21	28.0	23.6
22	28.9	24.4
23	29.8	25.2
24	30.7	26.1
25	31.6	26.9
26	32.5	27.8
27	33.4	28.6
28	34.4	29.5
29	35.3	30.4
30	36.3	31.3
31	37.3	32.3
32	38.3	33.2
33	39.3	34.2
34	40.3	35.2
35	41.4	36.1
36	42.5	37.1
37	43.5	38.2
38	44.6	39.2
39	45.7	40.2
40	46.9	41.3
41	48.0	42.4
42	49.2	43.5
43	50.3	44.6
44	51.5	45.7
45	52.7	46.9
46	54.0	48.0
47	55.2	49.2
48	56.4	50.4
49	57.7	51.6
50	59.0	52.9
51	60.3	54.1
52	61.6	55.4
53	63.0	56.6
54	64.3	57.9
55	65.7	59.3

°F	Liquid	Vapor
56	67.1	60.6
57	68.5	61.9
58	70.0	63.3
59	71.4	64.7
60	72.9	66.1
61	74.4	67.5
62	75.9	69.0
63	77.4	70.5
64	79.0	71.9
65	80.5	73.4
66	82.1	75.0
67	83.7	76.5
68	85.3	78.1
69	87.0	79.7
70	88.7	81.3
71	90.3	82.9
72	92.1	84.5
73	93.8	86.2
74	95.5	87.9
75	97.3	89.6
76	99.1	91.3
77	100.9	93.1
78	102.7	94.9
79	104.6	96.7
80	106.5	98.5
81	108.4	100.3
82	110.3	102.2
83	112.3	104.1
84	114.2	106.0
85	116.2	107.9
86	118.2	109.9
87	120.3	111.8
88	122.3	113.8
89	124.4	115.9
90	126.5	117.9
91	128.7	120.0
92	130.8	122.1
93	133.0	124.2
94	135.2	126.3
95	137.4	128.5
96	139.7	130.7
97	142.0	132.9
98	144.3	135.2
99	146.6	137.5
100	149.0	139.8
101	151.3	142.1
102	153.7	144.4
103	156.2	146.8

°F	Liquid	Vapor
104	158.6	149.2
105	161.1	151.7
106	163.6	154.1
107	166.2	156.6
108	168.7	159.1
109	171.3	161.6
110	174.0	164.2
111	176.6	166.8
112	179.3	169.4
113	182.0	172.1
114	184.7	174.8
115	187.5	177.5
116	190.3	180.2
117	193.1	183.0
118	195.9	185.8
119	198.8	188.6
120	201.7	191.5
121	204.6	194.4
122	207.6	197.3
123	210.6	200.2
124	213.6	203.2
125	216.7	206.2
126	219.8	209.3
127	222.9	212.4
128	226.0	215.5
129	229.2	218.6
130	232.4	221.8
131	235.6	225.0
132	238.9	228.2
133	242.2	231.5
134	245.6	234.8
135	248.9	238.1
136	252.3	241.5
137	255.8	244.9
138	259.2	248.3
139	262.7	251.8
140	266.3	255.3
141	269.8	258.8
142	273.4	262.4
143	277.1	266.0
144	280.7	269.7
145	284.4	273.3
146	288.2	277.1
147	291.9	280.8
148	295.7	284.6
149	299.6	288.4
150	303.5	292.3

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-437A PT Chart

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

refrigerantptchart.com

°C	Liquid	Vapor
-40	-30.6	-42.4
-39	-27.1	-39.2
-38	-23.4	-36.0
-37	-19.6	-32.6
-36	-15.6	-29.1
-35	-11.4	-25.4
-34	-7.1	-21.5
-33	-2.7	-17.6
-32	1.9	-13.4
-31	6.7	-9.1
-30	11.7	-4.7
-29	16.8	-0.1
-28	22.1	4.7
-27	27.6	9.7
-26	33.3	14.9
-25	39.2	20.2
-24	45.3	25.8
-23	51.6	31.5
-22	58.1	37.4
-21	64.8	43.6
-20	71.7	49.9
-19	78.9	56.5
-18	86.3	63.3
-17	93.9	70.3
-16	101.7	77.5
-15	109.8	85.0
-14	118.2	92.7
-13	126.8	100.7
-12	135.7	108.9
-11	144.8	117.4
-10	154.2	126.1
-9	163.8	135.1
-8	173.8	144.4
-7	184.0	153.9
-6	194.5	163.8
-5	205.4	173.9

°C	Liquid	Vapor
-4	216.5	184.3
-3	227.9	195.0
-2	239.6	206.0
-1	251.7	217.4
0	264.1	229.0
1	276.8	241.0
2	289.8	253.3
3	303.2	266.0
4	316.9	279.0
5	331.0	292.3
6	345.4	306.0
7	360.2	320.0
8	375.4	334.4
9	390.9	349.2
10	406.8	364.4
11	423.2	380.0
12	439.9	395.9
13	457.0	412.2
14	474.5	429.0
15	492.4	446.1
16	510.8	463.7
17	529.5	481.7
18	548.7	500.1
19	568.4	519.0
20	588.5	538.3
21	609.0	558.1
22	630.0	578.3
23	651.4	599.0
24	673.4	620.2
25	695.8	641.8
26	718.6	663.9
27	742.0	686.5
28	765.9	709.7
29	790.3	733.3
30	815.2	757.4
31	840.6	782.1

°C	Liquid	Vapor
32	866.5	807.3
33	893.0	833.0
34	920.0	859.3
35	947.5	886.1
36	975.6	913.5
37	1004.3	941.5
38	1033.5	970.0
39	1063.4	999.1
40	1093.7	1028.8
41	1124.7	1059.1
42	1156.3	1090.1
43	1188.5	1121.6
44	1221.3	1153.8
45	1254.7	1186.5
46	1288.7	1220.0
47	1323.4	1254.1
48	1358.8	1288.8
49	1394.7	1324.2
50	1431.4	1360.3
51	1468.7	1397.1
52	1506.6	1434.5
53	1545.3	1472.7
54	1584.7	1511.5
55	1624.7	1551.1
56	1665.5	1591.4
57	1707.0	1632.5
58	1749.2	1674.3
59	1792.1	1716.9
60	1835.8	1760.2
61	1880.2	1804.3
62	1925.4	1849.2
63	1971.4	1894.9
64	2018.1	1941.4
65	2065.6	1988.7

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-437A chart

This R-437A 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 charts (Chemours). Reference only: always verify with the manufacturer’s data and your gauges.

FAQ

What is the R-437A pressure at 40 °F?

41.3 psig vapor (dew) and 46.9 psig liquid (bubble) at saturation, from the table above.

What is the R-437A pressure at 100 °F?

139.8 psig vapor (dew) and 149.0 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-437A has 5.08 °F of glide at a 40 °F evaporator, so the two columns differ.

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R-437A PT Chart

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R-437A pressure temperature table

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About this R-437A chart

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