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

HVAC Refrigerant Pressure Temperature 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. 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