Note For Backup Operation - Toshiba SMMS-e Quick Reference Manual

COMPRESSOR BACKUP
This product offers backup modes of operation to tide over certain emergency situations. If a fault
occurs in one of the compressors, it is possible to operate the system on an emergency basis by
operating only the remaining compressor, (compressor backup operation).
If one of the outdoor units fails in a combined outdoor unit system, the system can be operated on
an emergency basis by keeping only the remaining outdoor unit(s), (outdoor unit backup operation).
Perform backup operation setting in accordance with the procedure described below

Note For Backup Operation

The method of backup operation differs according to the contents of fault as shown in the table
below.
Note 1: If the compressor has failed due to a fault in its motor coil (e.g. a layer short-circuit), do not
perform compressor backup operation because of severe oil degradation. It could damage other
outdoor units.
Note 2: Keep the number of backed-up outdoor units under compressor backup operation to one in
the system (single refrigerant line).
Note 3: Keep the number of backed-up outdoor units under outdoor unit backup operation to one
in the system (single refrigerant line).
Note 4: It is prohibited to combine compressor backup operation and outdoor unit backup
operation.
Note 5 : When the chassis of different size are combined,
do not perform back up operation with the large size chassis.
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