Calculating Subcooling; Table 34 R407C Pressure/Temperature Chart For Subcooling Only (Liquid Measurements) - Emerson Liebert Challenger 3000 Installation Manual

Table 34 R407C pressure/temperature chart for subcooling only (liquid measurements)
Temperature Pressure Gauge
°F °C Psig
36.0 2.2 73
37.0 2.8 74
38.0 3.3 76
39.0 3.9 77
40.0 4.4 79
41.0 5.0 81
42.0 5.6 82
43.0 6.1 84
44.0 6.7 86
45.0 7.2 87
46.0 7.8 89
47.0 8.3 91
48.0 8.9 93
49.0 9.4 95
50.0 10.0 96
51.0 10.6 98
52.0 11.1 100
53.0 11.7 102
54.0 12.2 104
55.0 12.8 106
56.0 13.3 108
57.0 13.9 110
58.0 14.4 112
- - -
NOTE
Use this table for subcooling calculation ONLY. See Table 33 for superheat or control
adjustment.
8.1

Calculating Subcooling

Example
Measure the liquid pressure (e.g., 200 psig). Find the liquid saturation temperature at that pressure
on Table 34 (e.g., 93°F). Measure the temperature of the liquid line (e.g., 90°F). Subtract the actual
temperature from the liquid saturation temperature to obtain the subcooling (e.g., 93 – 90 = 3°F). If
the actual temperature is greater than the liquid saturation temperature, then there is no subcooling,
and the fluid may be a mixture of liquid and vapor.
Why There Are Two R407C Temperature and Pressure Tables
R407C is a blend of refrigerants that exhibits a temperature "glide" of approximately 8 to 12°F
(4 to 7°C). This "glide" is the difference between the liquid and vapor saturation temperatures at a
given pressure. Use the correct table for the saturation temperature you need. Table 33 is for super-
heat or operating controls. Table 34 is for subcooling only.
Temperature
kPa °F °C
500 59.0 15.0
511 60.0 15.6
522 61.0 16.1
533 62.0 16.7
544 63.0 17.2
556 64.0 17.8
567 65.0 18.3
579 66.0 18.9
591 67.0 19.4
602 68.0 20.0
615 69.0 20.6
627 70.0 21.1
639 72.0 22.2
652 74.0 23.3
664 76.0 24.4
677 78.0 25.6
690 80.0 26.7
704 82.0 27.8
717 84.0 28.9
730 86.0 30.0
744 88.0 31.1
758 90.0 32.2
772 92.0 33.3
- - -
Pressure Gauge Temperature
Psig kPa °F
114 786 94.0
116 801 96.0
118 815 98.0
120 830 100.0
123 845 102.0
125 860 104.0
127 875 106.0
129 891 108.0
131 906 110.0
134 922 112.0
136 938 114.0
138 954 116.0
143 987 118.0
148 1021 120.0
153 1055 122.0
158 1090 124.0
163 1126 126.0
169 1163 128.0
174 1201 130.0
180 1239 132.0
185 1279 134.0
191 1319 136.0
197 1360 138.0
- - 140.0
78
R407C Refrigerant
Pressure Gauge
°C Psig kPa
34.4 203 1402
35.6 209 1444
36.7 216 1488
37.8 222 1532
38.9 229 1578
40.0 236 1624
41.1 242 1671
42.2 249 1720
43.3 257 1769
44.4 264 1819
45.6 271 1870
46.7 279 1922
47.8 287 1975
48.9 294 2029
50.0 302 2085
51.1 310 2141
52.2 319 2198
53.3 327 2256
54.4 336 2315
55.6 345 2376
56.7 354 2437
57.8 363 2500
58.9 372 2563
60.0 381 2628