– 251 –
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 a 10HP outdoor unit is under repair in a 30HP system:
Amount of refrigerant required by system as it was initially (30HP in capacity) = 34.5kg
Amount of refrigerant required by system with available outdoor units only (20HP in capacity) = 26.0kg
Amount of refrigerant to be removed from system = 34.5 – 26.0 = 8.5kg
(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 capacity (HP) Outdoor unit combination Amount of refrigerant (kg)
0.3188
0.410101
0.512121
0.024141
16
0.3288
0.2261
0.3201881
0.62010102
0.82210122
24
5.03888
5.032121
26
5.030188
5.03
6101
28
5.2301018
5.236121
30
5.43010101
5.436141
32
8888 40.0
5.536161
34
88810 40.0
5.73212101
36
8 8 10 10 40.0
5.83212121
38
8 101010 40.0
5.04612101
40
10 140 10 10 41.0
5.14612121
42
10 10 10 12 42.0
5.24614121
44
10 10 12 12 44.0
5.44616121
46
10 12 12 12 46.0
5.64616141
48
12 12 12 12 48.0
5.84616161
To Next Page
Loading...
Need help?
General
