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Check the nameplate for unit specific designed subcooling:
i.
If subcooling is low and superheat is normal, add charge to raise the subcooling to 7°F to 9°F.
ii.
If subcooling is low and superheat is high, add charge to raise the subcooling to 7°F to 9°F,
and adjust TXV if required.
iii.
If subcooling and superheat is low, adjust the TXV to 7°F to 9°F superheat and add or remove
charge if required.
iv.
If subcooiing is normal and superheat is low, adjust the TXV to raise the superheat to 7°F to 9°F
and remove charge if required.
v.
If subcooling is normal and superheat is high, adjust the TXV to lower the superheat to 7°F to 9°F
and add charge if required.
vi.
If subcooling is high and superheat is normal, remove charge to lower the subcooling to 7°F to 9°F.
vii.
If subcooling is high and superheat is low, remove charge to lower the subcooling to 7°F to 9°F
and adjust TXV.
viii.
If subcooling and superheat is high, adjust the TXV to lower the superheat to 7°F to 9°F
and remove or add charge if required.
11.3 ADJUSTING SYSTEM CHARGE FOR SYSTEMS USING FIXED ORIFICE
Procedure:
1. Follow the steps 1-4 from paragraph 10.2.
2. Check superheat. The system superheat should be adjusted according to TABLE 3. A dash indicates that
charging at this condition should not be attempted. Slugging may occur, leading to compressor damage.
Outdoor
Ambient
117
DB (°F)
65
65
70
58
75
51
80
-
85
-
90
-
95
-
100
-
105
-
110
-
115
-
120
-
125
-
11.4 RECORD SYSTEM INFORMATION
Record system pressures and temperatures after charging is complete. The total system charge shall
be marked on the condensing unit nameplate.
Model Number =
Serial Number =
Measured Outdoor Ambient =
Outdoor Leaving Air Temperature =
Indoor Air CFM =
Indoor Ambient =
Indoor Leaving Air Temperature =
Measured Liquid Line Temp =
Measured Suction Line Temp =
Liquid Gage Pressure =
Suction Gage Pressure =
Total System Charge =
Charging Chart
Evaporator Suction Pressure - PSIG
120
123
126
129
132
135
Evaporator Suction Temperature – Fahrenheit (°F)
70
-
-
-
-
-
63
68
-
-
-
-
56
61
66
70
-
-
50
54
59
63
68
72
-
-
53
58
62
66
-
-
-
51
56
60
-
-
-
-
51
55
-
-
-
-
-
51
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
R-410A
138
141
144
147
150
153
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
71
-
-
-
-
-
64
68
72
-
-
-
59
62
66
70
-
-
55
58
62
65
69
-
-
56
59
62
65
68
-
-
56
59
62
65
-
-
-
58
60
62
-
-
-
-
-
61
-
-
-
-
-
ºF DB
ºF DB
156
159
162
-
-
-
-
-
-
-
-
-
-
-
-
TABLE 3.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
67
-
-
64
66
68
63
64
66
62
63
64
W415-2973 / B / 07.18.22
21
IOM
ºF
ºF
ºF WB
ºF WB
ºF
ºF
PSIG
PSIG
OZ
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