AAON RQ SERIES, Installation Operation & Maintenance, Page: 66 / 100

66
The system is undercharged if the superheat
is too high and the sub-cooling is too low
Correct an undercharged system by adding
refrigerant to the system to reduce superheat
and raise sub-cooling.
If the sub-cooling is correct and the
superheat is too high, the TXV may need
adjustment to correct the superheat.
Table 17 - R-410A Refrigerant Temperature-Pressure Chart
°F PSIG °F PSIG °F PSIG °F PSIG °F PSIG
20
78.3
47
134.7
74
213.7
101
321.0
128
463.2
21 80.0 48 137.2 75 217.1 102 325.6 129 469.3
22
81.8
49
139.7
76
220.6
103
330.2
130
475.4
23 83.6 50 142.2 77 224.1 104 334.9 131 481.6
24
85.4
51
144.8
78
227.7
105
339.6
132
487.8
25 87.2 52 147.4 79 231.3 106 344.4 133 494.1
26 89.1 53 150.1 80 234.9 107 349.3 134 500.5
27 91.0 54 152.8 81 238.6 108 354.2 135 506.9
28 92.9 55 155.5 82 242.3 109 359.1 136 513.4
29 94.9 56 158.2 83 246.0 110 364.1 137 520.0
30 96.8 57 161.0 84 249.8 111 369.1 138 526.6
31
98.8
58
163.8
85
253.7
112
374.2
139
533.3
32 100.9 59 166.7 86 257.5 113 379.4 140 540.1
33
102.9
60
169.6
87
261.4
114
384.6
141
547.0
34 105.0 61 172.5 88 265.4 115 389.9 142 553.9
35
107.1
62
175.4
89
269.4
116
395.2
143
560.9
36 109.2 63 178.4 90 273.5 117 400.5 144 567.9
37 111.4 64 181.5 91 277.6 118 405.9 145 575.1
38 113.6 65 184.5 92 281.7 119 411.4 146 582.3
39 115.8 66 187.6 93 285.9 120 416.9 147 589.6
40
118.1
67
190.7
94
290.1
121
422.5
148
596.9
41 120.3 68 193.9 95 294.4 122 428.2 149 604.4
42
122.7
69
197.1
96
298.7
123
433.9
150
611.9
43 125.0 70 200.4 97 303.0 124 439.6
44
127.4
71
203.6
98
307.5
125
445.4
45 129.8 72 207.0 99 311.9 126 451.3
46 132.2 73 210.3 100 316.4 127 457.3