TEMPERATURE PRESSURE RELATIONSHIP
of refrigerants 12 and 22.
are measurements of vacuum in inches of mercury.
All others are in gauge measurement pounds per square inch.
For more information on what consumers and customers are hearing about R-410A, dealers are invited to visit www.410A.com.
| CHART I | CHART II | CHART III | ||||||||
| Temper- ature | Refrigerant | Temper- ature | Refrigerant | Temper- ature | Refrigerant | |||||
| °F | 12 | 22 | °F | 12 | 22 | °F | 12 | 22 | ||
|---|---|---|---|---|---|---|---|---|---|---|
| -60 | 19.0 | 11.9 | 12 | 15.8 | 34.9 | 43 | 39.7 | 73.5 | ||
| -55 | 17.3 | 9.1 | 13 | 16.5 | 35.9 | 44 | 40.7 | 75.0 | ||
| -50 | 15.4 | 6.0 | 14 | 17.1 | 36.9 | 45 | 41.7 | 76.6 | ||
| -45 | 13.3 | 2.6 | 15 | 17.7 | 37.9 | 46 | 42.6 | 78.2 | ||
| -40 | 10.9 | 0.6 | 16 | 18.4 | 38.9 | 47 | 43.6 | 79.8 | ||
| -35 | 8.3 | 2.7 | 17 | 19.0 | 40.0 | 48 | 44.6 | 81.4 | ||
| -30 | 5.4 | 5.0 | 18 | 19.7 | 41.1 | 49 | 45.7 | 83.0 | ||
| -25 | 2.3 | 7.5 | 19 | 20.4 | 42.2 | 50 | 46.7 | 84.7 | ||
| -20 | 0.5 | 10.3 | 20 | 21.0 | 43.3 | 55 | 52.0 | 93.3 | ||
| -18 | 1.3 | 11.5 | 21 | 21.7 | 44.4 | 60 | 57.7 | 102.5 | ||
| -16 | 2.0 | 12.7 | 22 | 22.4 | 45.5 | 65 | 63.7 | 112.2 | ||
| -14 | 2.8 | 13.9 | 23 | 23.2 | 46.7 | 70 | 70.1 | 122.5 | ||
| -12 | 3.6 | 15.2 | 24 | 23.9 | 47.8 | 75 | 76.9 | 133.4 | ||
| -10 | 4.4 | 16.6 | 25 | 24.6 | 49.0 | 80 | 84.1 | 145.0 | ||
| -8 | 5.3 | 18.0 | 26 | 25.4 | 50.2 | 85 | 91.7 | 157.2 | ||
| -6 | 6.2 | 19.4 | 27 | 26.1 | 51.5 | 90 | 99.7 | 170.1 | ||
| -4 | 7.1 | 20.9 | 28 | 26.9 | 52.7 | 95 | 108.2 | 183.7 | ||
| -2 | 8.1 | 22.5 | 29 | 27.7 | 54.0 | 100 | 117.1 | 197.9 | ||
| 0 | 9.2 | 24.1 | 30 | 28.5 | 55.2 | 105 | 126.5 | 212.9 | ||
| 1 | 9.7 | 24.9 | 31 | 29.3 | 56.5 | 110 | 136.4 | 228.7 | ||
| 2 | 10.2 | 25.7 | 32 | 30.1 | 57.8 | 115 | 146.7 | 245.3 | ||
| 3 | 10.7 | 26.6 | 33 | 30.9 | 59.2 | 120 | 157.6 | 262.6 | ||
| 4 | 11.2 | 27.4 | 34 | 31.7 | 60.5 | 125 | 169.0 | 280.7 | ||
| 5 | 11.8 | 28.3 | 35 | 32.6 | 61.9 | 130 | 181.0 | 299.3 | ||
| 6 | 12.3 | 29.2 | 36 | 33.4 | 63.3 | 135 | 193.5 | 319.6 | ||
| 7 | 12.9 | 30.1 | 37 | 34.3 | 64.6 | 140 | 206.6 | 341.3 | ||
| 8 | 13.5 | 31.0 | 38 | 35.2 | 66.1 | 145 | 220.3 | 364.0 | ||
| 9 | 14.0 | 32.0 | 39 | 36.1 | 67.5 | 150 | 234.6 | 387.2 | ||
| 10 | 14.6 | 32.9 | 40 | 37.0 | 69.0 | 155 | 249.5 | 410.8 | ||
| 11 | 15.2 | 33.9 | 41 | 37.9 | 70.5 | 160 | 265.1 | 434.6 | ||
| 42 | 38.8 | 72.0 | ||||||||
To use the charts, just choose a temperature from the left column of one of the charts and go to the right across to either refrigerant 12 (like refrigerators) or refrigerant 22 (like most home air conditioning) and see what the pressure will be if it is in a sealed container or system at that exact temperature and is not being pumped by the compressor. Refrigerant 22 at 140 (as would be a can of it sitting outside in the sun) would have a pressure inside the can of 341.3 pounds. You can also select a pressure from one of the columns such as R-22 down the third chart to find the pressure of 341.3 pounds and see what the ambient (air around the can) temperature is at that pressure. These pressure temperature charts are important for many reasons, but an easy example would be to see what the temperature of the refrigerant is inside the evaporator if the suction pressure is, say, 70 pounds and your pressure gauge doesn't show this temperature/pressure conversion. Look at the chart under R-22 and down to the pressure of 70 pounds and see that the temperature of the refrigerant inside the cooling coil is 41 °F. Isn't this convenient? Chart courtesy James' A/C Co. www.longviewweb.com Information on other refrigerants r-11, r-13, r-113, r-114, r-500, r-502, r-503, r-123, r-124, r-401a, r-401b, r-402a, r-402b, r-409a, r-23, r-134a, r-245fa, r-422d, r-404a, r-407c, r-407f, r-408a, r-507, r-508b and Gentron ST-20™ Flush
