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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 40ton (capacity type 480) system
(combination of outdoor unit: 14ton + 14ton + 12ton):
Amount of refrigerant to be removed from this system = 6.16 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
072
096
120
144
168
192
216
240
264
288
312
336
360
384
408
432
456
480
High heat
Outdoor unit
capacity type
072
096
120
144
192
240
288
360
Combination outdoor units
Unit 1
Unit 2
Unit 3
072
-
-
096
-
-
120
-
-
144
-
-
168
-
-
096
096
-
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
168
120
168
168
144
Combination outdoor units
Unit 1
Unit 2
Unit 3
072
-
-
096
-
-
120
-
-
072
072
-
096
096
-
120
120
-
096
096
096
120
120
120
Compensation by outdoor unit capacity type
lbs
2.20
2.64
-1.10
0.33
6.16
5.28
2.53
2.97
8.80
0.66
6.49
12.32
11.44
3.30
9.13
14.96
11.22
12.65
Compensation by outdoor unit capacity type
lbs
-2.20
-1.65
3.30
-4.40
-3.30
6.60
-4.95
9.90
- 258 -
kg
1.00
1.20
-0.50
0.15
2.80
2.40
1.15
1.35
4.00
0.30
2.95
5.60
5.20
1.50
4.15
6.80
5.10
5.75
kg
-1.00
-0.75
1.50
-2.00
-1.50
3.00
-2.25
4.50
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Troubleshooting
