MITSUBISHI ELECTRIC P500YMF-C User Manual
Page 50
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(12) Emergency response operating mode
The emergency operation mode is a mode in which the unit is run in an emergency to respond to the trouble when the
compressors (No. 1, No. 2) break down, making it possible to carry out a abnormality reset using the remote control.
1) Starting the Emergency Operation Mode
1
Trouble occurs (Display the abnormality code root and abnormality code on the remote control).
2
Carry out trouble reset with the remote control.
3
If the abnormality indicted in
1
above is of the kind that permits emergency operation (see the table below),
initiate a retry operation.
If the trouble indicated in
1
above is of the kind where emergency operation is impossible (see the table below),
restart operation after carrying out the previous abnormality reset (without entering the emergency operation
mode).
4
If the same abnormality is detected again during the retry operation in
3
above, carry out trouble reset once
more with the remote control, then try emergency operation starting corresponding to the contents of the
abnormality
Table Emergency Operation Mode Patterns and Abnormality Codes for which Emergency Operation is Possible or Impossible
Caution
During emergency operation, only X marked percentage of indoor units can be operated during emergency operation.
In case, more than X marked percentage of indoor units are operated, over than the percentage of indoor units
would be on the stand-by mode.
Codes for which emergency operation is
possible.
Emergency Mode
Pattern
Abnormality Codes for
which Emergency
Operation is Impossible
Action
When a No. 1
Compressor Failure
Occurs
When No. 2
Compressor Failure
Occurs
Trouble codes other than
those at left.
Emergency Operation only with the
No. 2 Compressor
* After the retry operation, even if
there is a different abnormality
code detected within
button and after resetting, start
the unit by emergency operation.
[Example]
4250
→
Reset
→
Retry
→
4240
→
Reset
→
Emergency
operation
Emergency Operation only with the
No. 1 Compressor
Serial transmission abnormality
0403
VDC sensor/circuit abnormality
4200
Bus voltage abnormality
4220
Radiator panel overheat
protection
4230
Overcurrent protection
4240
IPM alarm output
4250
/Bus voltage abnormality
Thermal sensor abnormality
(Radiator panel)
5110
IAC sensor/circuit abnormality
5301
Overcurrent protection
400
500
No. 1 Compressor Failure
Ч
48 %
Ч
65 %
No. 2 Compressor Failure
Ч
65 %
Ч
65 %