Refrigerant Pressure Temperature Chart | HVAC Refrigeration - This page offers a temperature pressure relationship chart for use in working with HVAC Systems that use R-410A, R-22, and R-134A. Additional refrigeration information and resources are located below the chart. For more information and comprehensive articles on HVAC Refrigeration see our Refrigeration Category.

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
7-48-261
8-46-243
9-44-225
10-42-207
11-40-198
12-39-1710
13-38-1512
14-36-1413
15-34-1215
16-33-1116
17-32-918
18-30-819
19-29-721
20-28-522
21-27-424
22-26-325
23-25-126
24-24027
25-22129
26-20230
27-19431
28-18532
29-17633
30-16735
31-15836
32-14937
33-131038
34-121139
35-111240
36-101341
37-91442
38-81543
39-71644
40-61745
42-41946
44-32148
46-22350
4802451
5012652
5232854
5442956
5663157
5873259
6083460
62103564
64113765
66133866
68144068
70154169
72164271
74174472
76194573
78204675
80214876
85245179
90265482
95295685
100325988
105346290
110366494
115396796
120416998
1254372100
1304574103
1354776105
1404978107
1455181109
1505383112
1555585114
1605787116
1655889118
1706091120
1756292122
1806494123
1856696125
1906798127
20070100129
20572102131
21073103132
22076104134
23079108137
24082114140
25084117143
26087120146
27590124149
29093128153
30597132157
32099136162
335104139166
350107143171
365109146174
380114149177
405118182182
500134202202
600149Off the ChartOff the Chart

Refrigerant Pressure Temperature Chart

These are currently the three most widely used refrigerants on the market today for HVAC applications in residential and commercial use.HVAC Refrigerant Pressure Temperature Chart 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 temperature chart, a set of manifold gauges, and a thermometer or solid state temperature sensing device. Every set of manifold gauges in use today have the pressure temperature chart or PT chart on the dials of the gauges so an HVAC technician need not carry a pressure temperature chart or PT chart with them. The gauges used for R-22 differ slightly from the gauges 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 manufacturer 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.

refrigerant pressureIt 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 different types of gauges, 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.

High Performance HVAC: Refrigerant Pressure Temperature Chart Information for Air Conditioners and Heat Pump Systems

Additional resources for refrigeration can be found here.

High Performance HVAC

HVAC Refrigerant Pressure Temperature Chart

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