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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.
main sub1
sub2
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 81 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 81 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
normal
C2 fail in
sub1
C2, C5, and
Inv. fail
1 2 3 4 5 6 7 81 2 3 4 5 6 7 8
C4 and C5
fail
1 2 3 4 5 6 7 81 2 3 4 5 6 7 81 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
inv C1 C2 C3 C4 C5
inv C1 C2 C3 C4 C5
inv C1 C2 C3 C4 C5
inv C1 C2 C3 C4 C5
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