10-2. How to Operate System While Troubled Outdoor Unit Being Repaired
<Outline>
After refrigerant is recovered from the troubled outdoor unit through a reclaim operation, the overall amount of
refrigerant held by the system becomes excessive, and this makes it impossible to operate the remaining
outdoor units even though they are not troubled. However, operation is still possible if the system-wide amount
of refrigerant is adjusted in accordance with the procedure described below.
<Work procedure>
(1) Follow the steps specified in “10-1. Refrigerant Recovery from Troubled Outdoor Unit (Reclaim)”.
(2) Adjust the amount of refrigerant held by the system by removing some of it using a refrigerant recovery
device, etc.
Determine the amount of refrigerant to be removed according to the capacity of the failed outdoor unit. (See
the table below.)
Example: If you are under repairing of a 16HP outdoor unit in the 50HP system
(combination of outdoor unit: 18HP + 16HP + 16HP):
Amount of refrigerant to be remove from this system = 11 kg
(3) Set up the outdoor unit from which refrigerant has been recovered in the manner described in “9-3. Outdoor
Unit Backup Operation Setting”.
This completes the procedure.
System Outdoor unit Amount of
System Outdoor unit Amount of
capacity (HP) combination refrigerant (kg)
capacity (HP) combination refrigerant (kg)
8 8 7.5
10 10 7.7
66 24 22 20
41.5
12 12 8.3
68 24 24 20
42.0
14 14 8.3
70 24 24 22
43.0
16 16 10.0
72 24 24
24
43.5
18 18 11.0
74 24 24 14 12
45.6
20 20 13.0
76 24 24 14 14
45.6
22 22 14.0
78 24 20 20 14
48.8
24 24 14.5
80 24 24 20 12
50.3
26 14 12 16.6
82 24 24 20 14
50.3
28 14 14 16.6
84 24 24 24 12
51.8
30 18 12
20.7
86 24 24 24 14
51.8
32 20 12
21.3
88 24 24 20 20
55.0
34 20 14
21.3
90 24 24
22 20
56.0
36 24 12
22.8
92 24 24
24 20
56.5
38 24 14
22.8
94 24 24 24 22
57.5
40 20 20
26.0
96 24 24 24 24
58.0
42 24 18
25.5
98 24 24
24 14
12 60.1
44 24 20
27.5
100 24 24 24 14
14 60.1
46 24 22
28.5
102 24 24 20 20
14 63.3
48 24 24
29.0
104 24 24 24 20
12 64.8
50 24 14 12
31.1
106
24 24
24 20
14 64.8
52 24 14 14
31.1
108
24 24
24 24
12 66.3
54 20 20 14
34.3
110
24 24
24 24
14 66.3
56 24 20 12
35.8
112
24 24
24 20
20 69.5
58 24 20 14
35.8
114
24 24
24 22
20 70.5
60 24 24 12
37.3
116
24 24
24 24
20
71.0
62 24 24 14
37.3
118 24 24
24 24
22
72.0
64 24 20 20
37.3
120 24 24 24 24
24 72.5
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14A 14A 9.8
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