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Charge Using Subcooling Method, Fixed Orifice
Systems
Outdoor Temp. > 65ºF (18ºC)
If charging a fixed orifice system when the outdoor ambient
is 65F (18C) or above, use the subcooling method to
charge the unit.
NOTE − To determine saturation temperature/pressure, use
the R−410A temperature/pressure chart (table 4).
1 − With the manifold gauge hose still on the liquid service
port and the unit operating stably, use a digital thermom-
eter to record the liquid line temperature.
2 − At the same time, record the liquid line pressure reading.
3 − Determine the saturation temperature for the liquid line
pressure reading. See table 4.
4 − Subtract the liquid line temperature from the saturation
temperature (according to the chart) to determine sub-
cooling.
5 − Compare the subcooling value with those in table 5. If
subcooling is greater than shown, recover some refrig-
erant. If subcooling is less than shown, add some refrig-
erant.
TABLE 4
R−410A Temperature (°F) − Pressure (Psig)
°F Psig °F Psig °F Psig °F Psig
32 100.8 64 181.6 96 299.4 126 451.8
34 105.0 66 187.7 98 308.2 128 463.5
36 109.2 68 194.1 100 317.2 130 475.6
38 113.6 70 200.6 102 326.4 132 487.8
40 118.0 72 207.2 104 335.7 134 500.2
42 122.6 74 214.0 106 345.3 136 512.9
44 127.3 76 220.9 108 355.0 138 525.8
46 132.2 78 228.0 110 365.0 140 539.0
48 137.1 80 235.3 112 375.1 142 552.3
50 142.2 82 242.7 114 385.4 144 565.9
52 147.4 84 250.3 116 396.0 146 579.8
54 152.8 86 258.0 118 406.7 148 593.8
56 158.2 88 266.0 120 417.7 150 608.1
58 163.9 90 274.1 122 428.8 152 622.7
60 169.6 92 282.3 124 440.2 154 637.5
62 195.5 94 290.8 126 451.8 156 652.4
TABLE 5
XC13 Subcooling Values − Fixed Orifice Systems
Model −018 −024 −030 −036 −042 −048 −060
Outdoor
Temperature
°F (°C)
Saturation Temperature F (C)
Liquid Line Temperature F (C)
= Subcooling Value F (C)
65 (18)
8 (4.4) 14 (7.7) 10 (5.5) 10 (5.5) 13 (7.2) 15 (8.3) 11 (6)
70 (18)
4 (2.2) 13 (7.2) 9 (5) 8 (4.4) 12 (6.7) 14 (7.7) 10 (5.5)
75 (24)
3 (1.7) 12 (6.7) 8 (4.4) 7 (4) 11 (6) 13 (7.2) 10 (5.5)
80 (24)
2 (1) 11 (6) 7 (4) 7 (4) 11 (6) 12 (6.7) 10 (5.5)
85 (29)
2 (1) 11 (6) 6 (3.3) 6 (3.3) 10 (5.5) 11 (6) 9 (5)
90 (35)
2 (1) 9 (5) 5 (2.7) 5 (2.7) 9 (5) 10 (5.5) 9 (5)
95 (35)
2 (1) 9 (5) 4 (2.2) 4 (2.2) 8 (4.4) 9 (5) 8 (4.4)
100 (41)
1 (0.5) 7 (4) 4 (2.2) 4 (2.2) 7 (4) 9 (5) 8 (4.4)
105 (41)
1 (0.5) 6 (3.3) 3 (1.7) 3 (1.7) 7 (4) 8 (4.4) 7 (4)
110 (41)
1 (0.5) 6 (3.3) 2 (1) 2 (1) 6 (3.3) 7 (4) 7 (4)
115 (45)
1 (0.5) 5 (2.7) 2 (1) 2 (1) 5 (2.7) 6 (3.3) 6 (3.3)
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