How To Operate System While Failed Outdoor Unit Being Repaired - Toshiba MMY-MAP0806HT8(J)P Service Manual

10-2. How to Operate System While Failed Outdoor Unit
Being Repaired
<Outline>
After refrigerant is recovered from the failed outdoor unit through a pump-down 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 faulty. 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 Failed Outdoor Unit (Pump-Down)".
(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.
Capacity code of outdoor unit under repair
AMP Air Conditioning
[HP]
8
10
12
14
16
18
20
22
− 251 −
Removal amount of refrigerant
[kg]
8
8
10
10.5
11
13
13
13
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