Allied Lennox 4AC16LT Series Installationsanleitung Handbuch - Seite 12

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1. Record outdoor ambient temperature using a digital
thermometer.
2.
Attach high pressure gauge set and operate unit for
several minutes to allow system pressures to stabilize.
3.
Compare stabilized pressures with those provided
in Table 8. Minor variations in these pressures may
be expected due to differences in installations.
Significant differences could mean that the system
is not properly charged or that a problem exists with
some component in the system. Pressures higher than
those listed indicate that the system is undercharged.
Verify adjusted charge using the approach method.
4.
Use the same digital thermometer to check liquid line
temperature.
5.
Subtract the outdoor ambient temperature from the
liquid line temperature to determine the approach
temperature.
Capacity
-24
Temp °F
12
Table 5. Subcooling Values
°
°
-
°
=
6.
Compare the approach value with those shown in
Table 6. If the values do not agree with those provided
in Table 6, add refrigerant to lower the approach
temperature or recover refrigerant from the system to
increase the approach temperature.
Check Charge Using Normal Operating
Pressures
Use Table 8 to perform maintenance checks. Table 8 is not
a procedure for charging the system. Minor variations in
these pressures may be due to differences in installations.
Significant deviations could mean that the system is not
properly charged or that a problem exists with some
component in the system.
Capacity
-24
Temp °F
4
Approach value is the liquid line temperature minus the
outdoor ambient temperature (±1°F).
NOTE: For best results, use the same digital thermometer to
check both outdoor ambient and liquid temperatures.
Table 6. Approach Values for TXV Systems
Page 12 of 20
-36
-48
-60
11
9.5
Liquid Line Temperature °F
Outdoor Ambient
Temperature °F
Approach Temperature °F
-36
-48
-60
5
5
Temp
Pressure
°F
32
100.8
33
102.9
34
105.0
35
107.1
36
109.2
37
111.4
38
113.6
39
115.8
40
118.0
41
120.3
42
122.6
43
125.0
44
127.3
45
129.7
46
132.2
47
134.6
7
48
137.1
49
139.6
50
142.2
51
144.8
52
147.4
53
150.1
54
152.8
55
155.5
56
158.2
57
161.0
58
163.9
59
166.7
60
169.6
61
172.6
62
175.5
63
178.5
64
181.6
65
184.3
66
187.7
67
190.9
68
194.1
69
197.3
70
200.6
71
203.9
6
72
207.2
73
210.6
Table 7. R410A Temperature / Pressure Chart
Issue 1827
Temp
Pressure
psig
°F
psig
74
214.0
75
217.4
76
220.9
77
224.4
78
228.0
79
231.6
80
235.3
81
239.0
82
242.7
83
246.5
84
250.3
85
254.1
86
258.0
87
262.0
88
266.0
89
270.0
90
274.1
91
278.2
92
282.3
93
286.5
94
290.3
95
295.1
96
299.4
97
303.8
98
308.2
99
312.7
100
317.2
101
321.8
102
326.4
103
331.0
104
335.7
105
340.5
106
345.3
107
350.1
108
355.0
109
360.0
110
365.0
111
370.0
112
375.1
113
380.2
114
385.4
115
390.7
Temp
Pressure
°F
psig
116
396.0
117
401.3
118
406.7
119
412.2
120
417.7
121
423.2
122
428.8
123
434.5
124
440.2
125
445.9
126
451.8
127
457.6
128
463.5
129
469.5
130
475.6
131
481.6
132
487.8
133
494.0
134
500.2
135
506.5
136
512.9
137
519.3
138
525.8
139
532.4
140
539.0
141
545.6
142
552.3
143
559.1
144
565.9
145
572.8
146
579.8
147
586.8
148
593.8
149
601.0
150
608.1
151
615.4
152
622.7
153
630.1
154
637.5
155
645.0
506467-01