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9
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.
9-1. Note for Backup Operation
The method of backup operation differs according to the contents of fault as shown in the table below.
O
n
e
f o
h t
e
c
o
m
p
e r
s s
o
s r
n i
h t
e
A
l l
h t
e
c
o
m
p
e r
s s
o
s r
n i
h t
e
s
a
m
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
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). As for MMY-MAP1806*, MMY-MAP2006* and MMY-MAP2206, the
backup operation 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 : When the chassis of different size are combined,
do not perform back up oueration with the large size chassis.
C
o
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n
s t
f o
a f
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s
a
m
e
u
n
t i
a f
s l i
s (
e
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N
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) 1
e
u
i n
f t
l i a
Example
Prohibited
Example
Prohibited
Backed-up compressor
Example
Prohibited
M
e
h t
o
d
f o
b
C
o
m
p
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s s
r o
b
O
u
d t
o
r o
u
n
t i
b
season outdoor unit backup (see
Notes 1, 3, 4 and 5)
Backed-up compressor Backed-up compressor
Backed-up outdoor unit Backed-up outdoor unit
Faulty
Faulty
Backed-up outdoor unit
Faulty
Example
Prohibited
Example
Prohibited
− 239 −
a
c
k
u
p operation
Setting procedure
a
k c
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p
s (
e
e
N
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) 2
G
o
o t
- 9
. 2
a
k c
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p
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c
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n i l
- g
Go to 9-3. or 9-4.
Backed-up outdoor unit
Faulty
MMY-MAP1406*
MMY-MAP1206*
(MMY-MAP1606*)
Backed-up outdoor unit
Faulty
MMY-MAP1806*
MMY-MAP1606*
(MMY-MAP2006*)
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