Bryant R-22 561G User Manual
Page 5
B.
Cooling Only Procedure—Indoor unit equipped with
TXV—Subcooling Method
Factory charge and subcooling are shown on unit information
plate. To check charge, follow the procedure below.
NOTE: If subcooling charging conditions are not favorable,
charge must be weighed in accordance with unit rating plate, ±0.6
oz/ft. of 3/8-in. liquid line above or below 15 ft, respectively.
Favorable conditions fall within the ranges given on the charging
chart on the outdoor unit plate.
EXAMPLE:
To calculate additional charge required for a 25-ft. line set; 25 ft -
15 ft = 10 ft X 0.6 oz/ft = 6 oz of additional charge.
This system requires charging by the subcooling method.
1. Operate unit a minimum of 10 minutes before checking
charge.
2. Measure liquid service valve pressure by attaching an
accurate gauge to service port.
3. Measure liquid line temperature by attaching an accurate
thermistor type of electronic thermometer to liquid line near
outdoor coil.
4. Refer to unit rating plate for required subcooling tempera-
ture.
5. Refer to Table 3. Find the point where required subcooling
temperature intersects measured liquid service valve pres-
sure.
6. To obtain required subcooling temperature at the specific
liquid line pressure, add refrigerant if liquid line tempera-
ture is higher than indicated or reclaim refrigerant if
temperature is lower. Allow a tolerance of ±3°F.
NOTE: In long-line applications, See the Residential Split Sys-
tem Long-Line Application Guideline for special charging require-
ments.
CARE AND MAINTENANCE
For continuing high performance and to minimize possible equip-
ment failure, it is essential that periodic maintenance be performed
on this equipment.Consult your servicing contractor or Owner’s
Manual for proper frequency of maintenance. Frequency of
maintenance may vary depending upon geographic areas, such as
coastal applications.
Leave Owner’s Manual with homeowner. Explain system opera-
tion and maintenance procedures outlined in manual.
TABLE 3—REQUIRED SUBCOOLING TERMPERATURE
(°F)
LIQUID
PRESSURE AT
SERVICE VALVE
REQUIRED SUBCOOLING TERMPERATURE (°F)
(PSIG)
5
10
15
20
134
71
66
61
56
141
74
69
64
59
148
77
72
67
62
156
80
75
70
65
163
83
78
73
68
171
86
81
76
71
179
89
84
79
74
187
92
87
82
77
196
95
90
85
80
205
98
93
88
83
214
101
96
91
86
223
104
99
94
89
233
107
102
97
92
243
110
105
100
95
253
113
108
103
98
264
116
111
106
101
274
119
114
109
104
285
122
117
112
107
297
125
120
115
110
309
128
123
118
113
321
131
126
121
116
331
134
129
124
119
346
137
132
127
122
359
140
135
130
125
24 VAC HOT
24 VAC COM
R
C
G
W/W1
Y/Y2
R
C
C
A/C
THERMOSTAT
Typical
FAN COIL
AIR
CONDITIONER
G
W2
HEAT STAGE 1
COOL STAGE 1
INDOOR FAN
24 VAC HOT
24 VAC COM
R
C
G
W/W1
Y/Y2
R
C
C
A/C
THERMOSTAT
Typical
FURNACE
AIR
CONDITIONER
Y
G
W
HEAT STAGE 1
COOL STAGE 1
INDOOR FAN
A02326
Fig. 6—Generic Wiring Diagram
(See Thermostat Installation Instructions for wiring specific unit combinations)
—5—