How To Operate System While Troubled Outdoor Unit Being Repaired - Toshiba MMY-MUP0801HT8P-TR Service Manual

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
capacity (HP) combination
-
8 8
10 10 -
12 12 -
14 14 -
16 16 -
18 18 -
20 20 -
22 22 -
24 24 -
26 14 12
28 14 14
30 18 12
32 20 12
34 20 14
36 24 12
38 24 14
40 20 20
42 24 18
44 24 20
46 24 22
48 24 24
50 24 14
52 24 14
54 20 20
56 24 20
58 24 20
60 24 24
62 24 24
64 24 20
Amount of
refrigerant (kg)
- - - 7.5
- - - 7.7
- - - 8.3
- - - 8.3
- - - 10.0
- - - 11.0
- - - 13.0
- - - 14.0
- - - 14.5
- - - 16.6
- - - 16.6
- - - 20.7
- - -
21.3
- - - 21.3
- - - 22.8
- - - 22.8
- - - 26.0
- - - 25.5
- - - 27.5
- - - 28.5
- - - 29.0
12 - - 31.1
14 - - 31.1
14 - - 34.3
12 - -
35.8
14 - - 35.8
12 - - 37.3
14 - - 37.3
20 37.3
System
capacity (HP)
66 24 22
68 24 24
70 24 24
72 24 24
74 24 24
76 24 24
78 24 20
80 24 24
82 24 24
84 24 24
86 24 24
88 24 24
90 24 24
92 24 24
94 24 24
96 24 24
98 24 24
100 24 24
102 24 24
104 24 24
106 24 24
108 24 24
110 24 24
112 24 24
114 24 24
116 24 24
118 24 24
120 24 24
- 263 -
Outdoor unit Amount of
combination refrigerant (kg)
20 - -
20 - -
22 - -
24 - -
14 12 -
14 14 -
20 14 -
20 12 -
20 14 -
24 12 -
24 14 -
20 20 -
22 20 -
24 20 -
24 22 -
24 24 -
24 14 12
24 14
14
20 20 14
24 20 12
24 20 14
24 24 12
24 24 14
24 20 20
24 22 20
24 24 20
24 24 22
24 24 24
41.5
42.0
43.0
43.5
45.6
45.6
48.8
50.3
50.3
51.8
51.8
55.0
56.0
56.5
57.5
58.0
60.1
60.1
63.3
64.8
64.8
66.3
66.3
69.5
70.5
71.0
72.0
72.5