Emergency Operation - LG ARUV Series Service Manual

Function

4.3 Emergency operation

- If a compressor is out of order, the system can be run except the defective compressor by backup function.
- There are two backup modes. One is the backup of constant speed compressor, and the other is the backup of
inverter compressor.
- In inverter compressor backup mode, there is a restriction on the capacity of the running indoor units. In case of
inverter failure, backup operation is possible when 110kBtu/hr. or more indoor units are ON.
- On the case of single outdoor unit, the required indoor operating capacity is 70kBtu/hr.
- Under the limit capacity in inverter backup mode, outdoor unit will not be run even indoor units are still running.
normal
C2 fail in
sub1
C2, C5, and
Inv. fail
C4 and C5
fail
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Only for training and service purposes
main
inv C1 C2
1 2 3 4 5 6 7 8
inv C1 C2
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
inv C1 C2
1 2 3 4 5 6 7 8
inv C1 C2
- 218 -
sub1
C3 C4
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
C3 C4
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
C3 C4
1 2 3 4 5 6 7 8
C3 C4
sub2
C5
1 2 3 4 5 6 7 8
C5
1 2 3 4 5 6 7 8
C5
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
C5
LGE Internal Use Only