Bryant R-22 User Manual
Page 46
3. Check electrical connections for tightness and controls for
proper operation each heating (heat pump only) or cooling
season and service as necessary.
CAUTION:
Because of possible damage to the equip-
ment or personal injury, maintenance should be per-
formed by qualified personnel only.
COIL CLEANING
1. Remove top cover. See Remove Top Cover section.
CAUTION:
Coil fin damage can result in higher oper-
ating costs or compressor damage. Do not use flame,
high-pressure water, steam, or volatile or corrosive clean-
ers on fins or tubing.
2. Clean coil using vacuum cleaner and its crevice tool. Move
crevice tool vertically, close to area being cleaned, making
sure tool touches only the dirt on the fins and not the fins.
To prevent fin damage, do not scrub fins with tool or move
tool horizontally against fins.
3. If oil deposits are present, spray coil with ordinary house-
hold detergent. Wait 10 minutes, and proceed to next step.
4. Using garden hose, spray coil vertically downward with
constant stream of water at moderate pressure. Keep nozzle
at a 15° to 20° angle, about 3 in. from coil face and 18 in.
from tube. Spray so debris is washed out of coil and
basepan.
5. Restore power to unit.
CLEANING OUTDOOR FAN MOTOR AND BLADE
1. Remove fan motor and blade. Refer to Remove Fan-Motor
Assembly section of this manual. Be careful not to bend or
dent fan blade.
2. Clean motor and blade with soft brush or cloth. Be careful
not to disturb balance weights on fan blade.
3. Check fan-blade setscrew for tightness.
4. Reinstall fan motor and blade to top cover and check for
alignment.
5. Reinstall top cover and position blade as per Fig. 24.
6. Reconnect electrical power and check for proper operation.
ELECTRICAL CONTROLS AND WIRING
1. Disconnect power to both the outdoor and indoor units.
2. Check all electrical connections for tightness. Tighten all
screws on electrical connections. If any connections appear
to be burned or smoky, disassemble the connection, clean
all parts and stripped wires, and reassemble. Use a new
connector if old one is burned or corroded and crimp
tightly.
3. Reconnect electrical power to the indoor and outdoor units
and observe unit through 1 complete operating cycle.
4. If there are any discrepancies in the operating cycle,
troubleshoot to find the cause, and correct.
REFRIGERANT CIRCUIT
1. Check the refrigerant charge using the superheat or sub-
cooling method, whichever is applicable. If low on charge,
check unit for leaks using an electronic leak detector.
2. If any leaks are found, recover or isolate charge (pump-
down) if applicable and make necessary repairs.
3. Evacuate, recharge, and operate unit through entire cycle.
FINAL CHECKOUT
After the unit has been operating, the following items should be
checked:
1. Check that unit operational noise is not excessive due to
vibration of components, tubing, panels, etc. If present,
isolate problem and correct.
2. Check to be sure caps are installed on service valves and
that they are tight.
TABLE 24—REQUIRED LIQUID-LINE TEMPERATURE
PRESSURE (PSIG)
AT SERVICE FITTING
REQUIRED SUBCOOLING TEMPERATURE (°F)
0
5
10
15
20
25
134
76
71
66
61
56
51
141
79
74
69
64
59
54
148
82
77
72
67
62
57
156
85
80
75
70
65
60
163
88
83
78
73
68
63
171
91
86
81
76
71
66
179
94
89
84
79
74
69
187
97
92
87
82
77
72
196
100
95
90
85
80
75
205
103
98
93
88
83
78
214
106
101
96
91
86
81
223
109
104
99
94
89
84
233
112
107
102
97
92
87
243
115
110
105
100
95
90
253
118
113
108
103
98
93
264
121
116
111
106
101
96
274
124
119
114
109
104
99
285
127
122
117
112
107
102
297
130
125
120
115
110
105
309
133
128
123
118
113
108
321
136
131
126
121
116
111
331
139
134
129
124
119
114
346
142
137
132
127
122
117
359
145
140
135
130
125
120
—46—