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PRESSURE (PSIG)
AT SERVICE FITTING
134
141
148
156
163
171
179
187
196
205
214
223
233
243
253
264
274
285
297
309
321
331
346
359
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.
TABLE 24—REQUIRED LIQUID-LINE TEMPERATURE
REQUIRED SUBCOOLING TEMPERATURE (°F)
0
5
76
71
79
74
82
77
85
80
88
83
91
86
94
89
97
92
100
95
103
98
106
101
109
104
112
107
115
110
118
113
121
116
124
119
127
122
130
125
133
128
136
131
139
134
142
137
145
140
—46—
10
15
66
61
69
64
72
67
75
70
78
73
81
76
84
79
87
82
90
85
93
88
96
91
99
94
102
97
105
100
108
103
111
106
114
109
117
112
120
115
123
118
126
121
129
124
132
127
135
130
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.
20
25
56
51
59
54
62
57
65
60
68
63
71
66
74
69
77
72
80
75
83
78
86
81
89
84
92
87
95
90
98
93
101
96
104
99
107
102
110
105
113
108
116
111
119
114
122
117
125
120
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Table of Contents
Troubleshooting
