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: It is prohibited to combine compressor backup operation and outdoor unit backup operation.
ukcab fo dohteMtluaf fo stnetnoC p operation Setting procedure
Go to 10-2.
)2 etoN ees( pukcab rosserpmoC)1 etoN ees( sliaf tinu emas eht ni srosserpmoc eht fo enO
liaf tinu emas eht ni srosserpmoc eht llA
Outdoor unit backup or cooling-
season outdoor unit backup
(see Notes 1 and 3)
Go to 10-3. or 10-4.
A fault occurs in a compressor motor coil (e.g. a layer short-circuit)
A fault occurs in a refrigerating cycle part, fan or related part, or electrical part
A fault occurs in a temperature sensor or pressure sensor
10 BACKUP OPERATION
(EMERGENCY OPERATION)
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.
10-1. Note for Backup Operation
The method of backup operation differs according to the contents of fault as shown in the table below.
Faulty
Prohibited
Example
Backed-up compressor
Backed-up compressor
Faulty
Prohibited
Example
Backed-up compressor
− 215 −
Faulty
Backed-up outdoor unit
Faulty
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