79
Backup Operation
This product offers backup modes of operation to tide over certain emergency situations. If a failure 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.
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Go to SVM-15067-4, 9-2
Go to SVM-15067-4, 9-3,
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A
season outdoor unit backup (see
Notes 1, 3, 4 and 5)
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
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Prohibited
Example
Backed-up compressor Backed-up compressor
Prohibited
Example
Backed-up outdoor unit Backed-up outdoor unit
Prohibited
Example
Backed-up outdoor unit
Backed-up compressor
Prohibited
Example
Backed-up outdoor unit
MMY-MAP1806
(MMY-MAP2006 )
MMY-MAP1606
Prohibited
Example
Backed-up outdoor unit
MMY-MAP1406 MMY-MAP1206
Note 1:
If the compressor has failed due to a fault in its motor coil (e.g. a layer short-circuit), do not perform com-
pressor 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). As for MMY-MAP1806 , MMY-MAP2006 and MMY-MAP2206 , the backup opera-
tion of compressor cannot be done.
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:
With a two-outdoor unit system, do not perform outdoor unit backup operation to back up the MMY-
MAP1406 (or MAP1606 ).
It could lead to compressor failure due to the abnormal operation.
Failure
Failure
Failure
Failure
Failure
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Summary of Contents for SMMS-e
Page 96: ...Quick Reference ...
