How To Operate System While Troubled Outdoor Unit Being Repaired - Toshiba MMY-MUP0721FT6P-UL 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 14ton (capacity type 168) outdoor unit in 42ton (capacity type 504) system
(combination of outdoor unit: 14ton + 14ton + 14ton):
Amount of refrigerant to be removed from this system = 4.4 Ibs
(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.
Standard
Outdoor unit
capacity type
6ton 072
8ton 096
10ton 120
12ton 144
14ton 168
16ton 192
16ton 192
18ton 216
20ton 240
22ton 264
24ton 288
26ton 312
28ton 336
30tton 360
32ton 384
34ton 408
36ton 432
38ton 456
40ton 480
42ton 504
High heat
Outdoor unit
capacity type
6ton 072
8ton 096
10ton 120
12ton 144
16ton 192
20ton 240
24ton 288
30ton 360
Combination outdoor units
Unit1 Unit2 Unit3
072 － －
096 － －
120 － －
144 － －
168 － －
192 － －
072 072 －
144 072 －
144 096 －
168 096 －
144 144 －
168 144 －
168 168 －
168 096 096
144 144 096
168 144 096
168 168 096
168 144 144
168 168 144
168 168 168
Combination outdoor units
Unit1 Unit2 Unit3
072 － －
096 － －
120 － －
072 072 －
096 096 －
120 120 －
096 096 096
120 120 120
- 297 -
Amount of additional
refrigerant(lbs)
2.2
2.2
0.0
2.2
4.4
5.5
4.4
4.4
4.4
6.6
4.4
6.6
8.8
8.8
6.6
8.8
11.0
8.8
11.0
13.2
Amount of additional
refrigerant(lbs)
2.2
2.2
6.6
4.4
4.4
13.2
6.6
19.8
Amount of additional
refrigerant(kg)
1.0
1.0
0.0
1.0
2.0
2.5
2.0
2.0
2.0
3.0
2.0
3.0
4.0
4.0
3.0
4.0
5.0
4.0
5.0
6.0
Amount of additional
refrigerant(kg)
1.0
1.0
3.0
2.0
2.0
6.0
3.0
9.0