Caution – AAON LL-540 User Manual
Page 45
45
in
the
summer
when
the
ambient
temperature is cold:
Once enough charge has been added to get
the evaporator superheat and sub-cooling
values to the correct setting more charge
may need to be added. If the ambient
temperature is 0°F no more charge is
required. If the ambient temperature is
around 40°F add approximately 40% of the
receiver tank volume.
The unit will have to be checked for proper
operation once the ambient temperature is
above 80°F.
Table 10 - R-134a Refrigerant Temperature-Pressure Chart
°F
PSIG
°F
PSIG
°F
PSIG
14
15
63
61
111
149
16
16
64
63
113
154
18
17
66
66
115
158
19
18
68
68
117
163
21
19
70
71
118
167
23
21
72
74
120
172
25
22
73
76
122
177
27
24
75
79
124
181
28
25
77
82
126
186
30
26
79
85
127
191
32
28
81
88
129
197
34
30
82
91
131
202
36
31
84
94
133
207
37
33
86
97
135
213
39
34
88
100
136
218
41
36
90
104
138
224
43
38
91
107
140
229
45
40
93
111
142
235
46
42
95
114
144
241
48
44
97
118
145
247
50
46
99
121
147
253
52
48
100
125
149
260
54
50
102
129
151
266
55
52
104
133
153
272
57
54
106
137
154
279
59
56
108
141
156
286
61
59
109
145
158
293
DO NOT OVERCHARGE!
Refrigerant overcharging leads to
excess refrigerant in the condenser
coils resulting in elevated compressor
discharge pressure.
CAUTION