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Written by Richard   
Saturday, 01 March 2008 08:11

Refrigeration Pressure Temperature Chart

high performance hvac, air conditioners, refrigeration PSIG corresponds to refrigeration temperature. Pressure Temperature
Chart represents the most common refrigerants used today. 

PSIG R-22 R-134A R-410A   PSIG R-22 R-134A R-410A
0 -41 -15 -60   78 46 75 20
2 -37 -10 -58   80 48 76 21
4 -32 -5 -54   85 51 79 24
6 -28 -1 -50   90 54 82 26
8 -24 3 -46   95 56 85 29
10 -20 7 -42   100 59 88 32
12 -17 10 -39   105 62 90 34
14 -14 13 -36   110 64 93 36
16 -11 16 -33   115 67 96 39
18 -8 19 -30   120 69 98 41
20 -5 22 -28   125 72 100 43
22 -3 25 -26   130 74 103 45
24 0 27 -24   135 76 105 47
26 2 30 -20   140 78 107 49
28 5 32 -18   145 81 109 51
30 7 35 -16   150 83 112 53
32 9 37 -14   160 87 116 57
34 11 39 -12   170 91 120 60
36 13 41 -10   180 94 123 64
38 15 43 -8   190 98 127 67
40 17 45 -6   200 101 131 70
42 19 47 -4   210 105 134 73
44 21 49 -3   220 108 137 76
46 23 51 -2   225 110 139 78
48 24 52 0   235 113 142 80
50 26 54 1   245 116 145 83
52 28 56 3   255 119 148 85
54 29 57 4   265 121 151 88
56 31 59 6   275 124 153 90
58 32 60 7   285 127 155 92
60 34 62 8   295 130 158 95
62 35 64 10   305 133 161 97
64 37 65 11   325 137 167 101
66 38 66 13   355 144 173 108
68 40 68 14   375 148 177 112
70 41 69 15   405 155 182 118
72 42 71 16   500 173 202 134
74 44 72 17   600 X X 149
76 45 73 19   700 X X 159

Tools of the HVAC and Refrigeration Trade

The pressure/temperature chart is a tool which is used by HVACR technicians when they are checking the refrigeration circuit. Refrigeration circuits can be found in air conditioners, heat pumps, refrigerators, freezers, walk-in coolers, walk-in freezers, chillers, process cooling systems, and transport refrigerated trailers. It is necessary to know the coressponding temperature to pressure or the corresponding pressure to the temperature of the systems. These readings, using the PT chart, a set of manifold refrigeration gages, and temperature sensors are used to determine if the unit is properly charge or if there is a problem with the refrigeration circuit. A good HVAC technician can determine of the refrigeration circuit has the proper charge, if there is a problem with the compressor, or if there is a problem with migrating oil in the refrigeration circuit just to name a few of the problems which can be found using the tools of the refrigeration trade. Using proven methods such as the superheat method or subcooling method a problem with the refrigeration system can be determined and action taken to correct the problem. To determine superheat or subcooling, a set of refrigeration gages, a temperature sensing device, and a PT chart is needed. In the hands of a good technician these tools are invaluable at ensuring the system is trouble free and working at optimum levels.

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Last Updated ( Saturday, 01 March 2008 08:20 )
 

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