![background image](http://html.mh-extra.com/html/carrier/r-22/r-22_application-manual-and-service-manual_2561468048.webp)
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, trouble-
shoot to find the cause, and correct.
REFRIGERANT CIRCUIT
1. Check the refrigerant charge using the superheat or subcooling
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 (pumpdown)
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.
MODEL
CUBE UNIT
AIR CONDITIONERS
CUBE UNIT
HEAT PUMPS
HORIZONTAL
AIR CONDITIONERS
38CK
38YC
38GN
38GNA
38HDA
38QRA
SERIES
0
1
0
1
1
2
0
0
0
014
—
—
—
—
10
—
—
—
—
018
15
16
11
14
12
—
17
20
10
024
14
11
14
8
—
12
19
17
19
030
12
12
9
10
—
—
—
20
18
036
18
16
11
7
—
—
—
22
26
042
18
17
17
—
—
—
—
—
—
048
—
17
12
—
—
—
—
18
17
060
—
21
10
—
—
—
—
23
17
Table 25—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
48