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High Performance HVAC Refrigerant Pressure Temperature Chart

PT Chart for Common Refrigerants

PSIG (Pounds per Square Inch Gauge)	Temperature °Fahrenheit
	Refrigerant Type
	R-410A (HFC)	R-22 (HCFC)	R-134A (HFC)
-5 inches mercury	-66	-48	-22
-4 inches mercury	-64	-47	-21
-3 inches mercury	-63	-45	-19
-2 inches mercury	-62	-44	-18
-1 inches mercury	-61	-43	-16
0	-60	-41	-15
1	-59	-39	-12
2	-58	-37	-10
3	-55	-34	-8
4	-54	-32	-5
5	-52	-30	-3
6	-50	-28	-1
7	-48	-26	1
8	-46	-24	3
9	-44	-22	5
10	-42	-20	7
11	-40	-19	8
12	-39	-17	10
13	-38	-15	12
14	-36	-14	13
15	-34	-12	15
16	-33	-11	16
17	-32	-9	18
18	-30	-8	19
19	-29	-7	21
20	-28	-5	22
21	-27	-4	24
22	-26	-3	25
23	-25	-1	26
24	-24	0	27
25	-22	1	29
26	-20	2	30
27	-19	4	31
28	-18	5	32
29	-17	6	33
30	-16	7	35
31	-15	8	36
32	-14	9	37
33	-13	10	38
34	-12	11	39
35	-11	12	40
36	-10	13	41
37	-9	14	42
38	-8	15	43
39	-7	16	44
40	-6	17	45
42	-4	19	46
44	-3	21	48
46	-2	23	50
48	0	24	51
50	1	26	52
52	3	28	54
54	4	29	56
56	6	31	57
58	7	32	59
60	8	34	60
62	10	35	64
64	11	37	65
66	13	38	66
68	14	40	68
70	15	41	69
72	16	42	71
74	17	44	72
76	19	45	73
78	20	46	75
80	21	48	76
85	24	51	79
90	26	54	82
95	29	56	85
100	32	59	88
105	34	62	90
110	36	64	94
115	39	67	96
120	41	69	98
125	43	72	100
130	45	74	103
135	47	76	105
140	49	78	107
145	51	81	109
150	53	83	112
155	55	85	114
160	57	87	116
165	58	89	118
170	60	91	120
175	62	92	122
180	64	94	123
185	66	96	125
190	67	98	127
200	70	100	129
205	72	102	131
210	73	103	132
220	76	104	134
230	79	108	137
240	82	114	140
250	84	117	143
260	87	120	146
275	90	124	149
290	93	128	153
305	97	132	157
320	99	136	162
335	104	139	166
350	107	143	171
365	109	146	174
380	114	149	177
405	118	182	182
500	134	202	202
600	149	Off the Chart	Off the Chart

R-22 Refrigerant is used a lot in residential and commercial HVAC

Manifold Gages with a PT Chart on the dials for R-22

These are currently the three most widely used refrigerants on the market today for HVAC applications in residential and commercial use. R-22 refrigerant is the king and used widely in the residential and commercial markets followed by R-134A which is used in commercial applications for chillers and in wide use in car air conditioning systems. R-134A replaced R-12 for automobile air conditioning systems. R-410A is currently being phased in for residential use as the phase period for R-22 draws nearer.

The pressure of the refrigerant corresponds with the temperature. Using a PT chart or pressure temperature chart one can determine the pressure or the temperature of the refrigerant. To properly charge an HVAC air conditioning or heat pump system one needs to use the PT chart or pressure temeprature chart, a set of manifold gages, and a thermometer or solid state temperature sensing device. Every set of manifold gages in use today have the pressure temperature chart or PT chart on the dials of the gages so an HVAC technician need not carry a pressure temperature chart or PT chart with them. The gages used for R-22 differ slightly from the gages used for R-410A as the pressures and temperatures are different for each type of system. Depending on the type of metering device the HVAC technician will use either the superheat method, the subcooling method, or use a chart provided by the manufactuer of the equipment to ensure that the charge in the system is correct. If the unit is not a split system but a package unit then a weigh in of refrigerant based on the manufacturers data can be done without using charts or the superheat or subcooling methods. The HVAC technician may decide to use these methods to double check the charge for the weigh in to be sure the charge is correct.

It is also important to note that the oil for R-410A and the oil for R-22 are different oils and precautions taken so that the oils do not mix. This is a good reason why an HVAC technician needs to carry two differnet types of gages, one for R410A and one for R-22. This prevents cross contamination of oils from an R-410A system to and R-22 system. The oil for R-134A is also different than the other oils used for R-22 and R-410A and it is important not to mix oils from other system or systems with different refrigerants and oils.