Page 11
Superheat RFC Charge
If value is greater than
shown, add refrigerant;
if less than shown,
remove refrigerant.
ABOVE
Outdoor
Ambient 40ºF
(4ºC)?
START: Measure outdoor ambient temperature
BELOW
NOTE − Do not at-
tempt to charge sys-
tem where a dash ap-
pears, system could
be overcharged. Su-
perheat is taken at va-
por line service port.
Vapor line superheat
must never be less
than 5ºF at the vapor
line service port.
USE WEIGH-IN METHOD
Weigh-in or remove refriger-
ant based upon line length
SHº (Superheat) Values (+/−5ºF)
Wet Bulb (air entering indoor coil)
ºF* 50 52 54 56 58 60 62 64 66 68 70 72 74 76
40 15 18 20 23 26 29 32 34 38 41 43 46 48 51
45 13 16 18 21 24 27 30 33 36 39 41 44 46 49
50 11 14 16 19 22 25 28 31 34 37 39 42 44 47
55 9 12141720232730333638404244
60 7 10121518212427303335384043
65 - 6 10 13 16 19 21 24 27 30 33 36 38 41
70 - - 7 1013161921242730333639
75 - - - 6 9 121518212428313437
80 - - - - 5 8 12 15 18 21 25 28 31 35
85 ------811151922263033
90 - - - - - - 5 9 13 16 20 24 27 31
95 -------6101418222529
100 - - - - - - - - 8 12 16 21 24 28
105 --------5913172226
110 ---------611152025
115 ----------8141824
* Dry−bulb temperature (ºF) of entering outdoor ambient air.
If refrigerant added or
removed, retest to
confirm that unit is
properly charged
1.. Confirm proper airflow across coil using figure
11.
2.. Check liquid and vapor line pressures and
compare unit pressures with Normal Operating
Pressures listed in table 2.
(Note: Table 2 is a general guide. Expect minor
pressures variations. Significant differences
may mean improper charge or other system
problem.)
3.. Use SUPERHEAT to correctly charge unit or to
verify the charge is correct.
SUPERHEAT METHOD
4.. Set thermostat to call for heat (must have a
cooling load between 70-80ºF (21−26ºC)
5.. Connect gauge set
6.. When heat demand is satisfied, set thermostat
to call for cooling
7.. Allow temperatures and pressures to stabilize
8.. Measure the vapor line pressure and use the
use value to determine saturation temperature
(table 4 on page 11) SATº =_________
9.. Record vapor line
temperature VAPº =_________
10.. Subtract to determine superheat (SHº):
11.. VAPº − _____ SATº ______ = SHº______
12.. Record the wet bulb temperature (air entering
indoor coil) WB =__________
13.. Record outdoor ambient temperature
14.. Compare results with table to the left
Table 4
HFC−410A Temperature (°F) − Pressure (Psig)
°F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig °F Psig
32 100.8 48 137.1 63 178.5 79 231.6 94 290.8 110 365.0
125 445.9
141 545.6
33 102.9 49 139.6 64 181.6 80 235.3 95 295.1 111 370.0 126 451.8 142 552.3
34 105.0 50 142.2 65 184.3 81 239.0 96 299.4 112 375.1 127 457.6 143 559.1
35 107.1 51 144.8 66 187.7 82 242.7 97 303.8 113 380.2 128 463.5 144 565.9
36 109.2 52 147.4 67 190.9 83 246.5 98 308.2 114 385.4 129 469.5 145 572.8
37 111.4 53 150.1 68 194.1 84 250.3 99 312.7 115 390.7 130 475.6 146 579.8
38 113.6 54 152.8 69 197.3 85 254.1 100 317.2 116 396.0 131 481.6 147 586.8
39 115.8 55 155.5 70 200.6 86 258.0 101 321.8 117 401.3 132 487.8 148 593.8
40 118.0 56 158.2 71 203.9 87 262.0 102 326.4 118 406.7 133 494.0 149 601.0
41 120.3 57 161.0 72 207.2 88 266.0 103 331.0 119 412.2 134 500.2 150 608.1
42 122.6 58 163.9 73 210.6 89 270.0 104 335.7 120 417.7 135 506.5 151 615.4
43 125.0 59 166.7 74 214.0 90 274.1 105 340.5 121 423.2 136 512.9 152 622.7
44 127.3 60 169.6 75 217.4 91 278.2 106 345.3 122 428.8 137 519.3 153 630.1
45 129.7 61 172.6 76 220.9 92 282.3 107 350.1 123 434.5 138 525.8 154 637.5
46 132.2 62 175.4 77 224.4 93 286.5 108 355.0 124 440.2 139 532.4 155 645.0
47 134.6 78 228.0 109 360.0 140 539.0
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