404a Operating Pressures (404a pt chart)

What are the 404a operating pressures? Well, in  this guide we  provide you with a 404 pt chart which shows the common operating pressures for 404a at different temperatures.

ac pressure guage

404a Operating Pressure Chart  (404a pt chart) 

Temp(°F)Liquid Pressure (psi)Vapor Pressure (psi)Temp  (°C)
-490.90.3-45
-481.30.7-44.4
-471.71.2-43.9
-462.11.6-43.3
-452.62-42.8
-4432.4-42.2
-433.52.9-41.7
-4243.4-41.1
-414.43.8-40.6
-404.94.3-40
-395.44.8-39.4 
-385.95.3-38.9
-376.45.8-38.3
-3676.3-37.8
-357.56.8-37.2
-3487.4-36.7
-338.67.9-36.1
-329.28.5-35.6
-319.79-35
-3010.39.6-34.4
-2910.910.2-33.9
-2811.510.8-33.3
-2712.211.4-32.8
-2612.812-32.2
-2513.412.7-31.7
-2414.113.3-31.1
-2314.814-30.6
-22  15.414.6-30
-2116.115.3-29.4
-2016.816-28.9
-1917.516.7-28.3
-1818.317.4-27.8
-171918.2-27.2
-1619.818.9-26.7
-1520.519.7-26.1
-1421.320.4-25.6
-1322.121.2-25
-1222.922-24.4
-1123.722.8-23.9
1024.624.6-23.3
-925.424.5-22.8
-826.325.3-22.2
-727.126.2-21.7
-62827-21.1
-528.927.9  -20.6  
-429.828.8-20
-330.829.8– 19.4
-231.730.7– 18.9
-132.731.6-18.3
033.732.6-17.8
134.733.6-17.2
235.734.6– 16.7
336.7  35.6– 25.6
437.736.6-15.6
538.837.7-15
639.838.7-14.4
740.939.8-13.9
84240.9-13.3
943.142-12.8
1044.343.1-12.2
1145.444.3-11.7
1246.645.4-11.1
1347.846.6-10.6
144947.8-10
1550.249-9.4
1651.550.2-8.9
1752.751.5-8.3
185452.7-7.8
1955.354-7.2
2056.655.3-6.7
2157.956.6-6.1
2259.358-5.6
2360.659.3-5
246260.7-4.4
2563.462.1-3.9
2664.863.5-3.3
2766.364.9-2.8
2867.866.4-2.2
2969.267.8-1.7
3070.769.3-1,1
3172.370.8-0.6
3273.872.40
3375.473.90.6
347775.51.1
3578.677.11.7
3680.2 78.72.2
3781,880.32.8
3883.5823.3
3985.283.73.9
4086.985.44.4
4188.687.15
4290.488.85.6
4392.290.66.1
449492.46.7
4595.894.27.2
4697.6967.8
4799.597.98,3
48101.499.88.9
49103.3101.79.4
50105.3103.610
51107.2105.610.6
52109.2107.611.1
5311.2109.611.7
54113.3111.612.2
55115.3113.612.8
56117.4115.713.3
57119.5117.813.9
58121.7119.914.4
59123.8122.115
60126124.215.6
61128.2126.416.1
62130.5128.716.7
63132.7130.917.2
64135133.217.8
65137.3135.518.3
66139.7137.818,9
67142140.219.4
68144.4142.620
69146.914520.6
70149.3147.421.1
71151.8149.921.7
72154.3152.422.2
73156.8154.922.8
74159.4157.523.3
75162160.123.9
76164.6162.724.4
77167.3165.325
7817016825.6
79172.7170.726.1
80175.4173.426.7
81178.2176.227.2
8218117927.8
83183.8181.828.3
84186.7184.728.9
85189.5187.529.4
86192.5190.430
87195.4193.430.6
88198.4196.431.1
89201.4199.431.7
90204.5202.432.2
91207.6205.532.8
92210.7208.633.3
93213.8211.733.9
94217214.934.4
95  220.2218.135
96  223.4221.435.6
97226.7224.636.1
98230227.936.7
99233.423137.2
100236.8234.637.8
101240.2238.138.3
102243.6241.538.9
103247.124539.4
104250.6248.540
105254.2252.140.5
106257.8255.641.1
107261.4259 .341.7
108265.1262.942.2
109268.8266.642.8
110  272.5270.443.3
111276.3274.143.9
112280.127844.4
113284281.845
114287.9285.745.6
115291.8289.646.1
116295.8293.646.7
117299.8297.647.2
118303.8301.747.8
119307.9305.848.3
120312.1309.948.9
121119.13141494
122320.4318.350
123324.7322.550.6
124329326.851.1
125333.3331.251.7
126337.7335.652.2
127342.134052.8
128346.6344.453.3
129351.134953.9
130355.7353.554.4
131360.235.155
132364.9362.855.6
133369.6367.556.1
134374.3372.256.7
135379.137757.2
136383.9381.957.8
137388.8386.858.3
138393.7391.758.9
139398.7396.759.4
140403.7401.760
141408.8406.860.6
142413.941261.1
143419.1417.161.7
144424.3422.462.2
145429.6427.762.8
146434.9433.163.3
147440.3438.563.9
148445.8443.964.4
149451.3449.565
150456.8455.165.6

Read also: R410a Pressure Chart High and Low Side

psi: Pound per square inch, unit of pressure

FAQ

What is the normal suction pressure on a 404a walk in the freezer?

The normal suction pressure on a 404 a walk in freezer is around 10-20 psig (10 is ideal) on the suction side if working properly. 

And the high side is  about 180 or so. High suction pressure could cause the evaporator coils to freeze.

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