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USE THIS LINK FOR A BETTER SCREEN PRESENTATION OF THIS PAGE.

TEMPERATURE PRESSURE RELATIONSHIP
of refrigerants 12 and 22.

The figures in BOLD/ITALICS
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

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