Mitsubishi City Multi PURY-P400 Service Handbook page 49

(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 an 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
Emergency Mode
Codes for which emergency operation is
Pattern
possible.
When a No. 1
Serial transmission abnormality
Compressor Failure
VDC sensor/circuit abnormality
Occurs
Bus voltage abnormality
Radiator panel overheat
protection
Overcurrent protection
IPM alarm output
/Bus voltage abnormality
Thermal sensor abnormality
(Radiator panel)
IAC sensor/circuit abnormality
When No. 2
Overcurrent protection
Compressor Failure
Occurs
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, the indoor units over the limit would be on the
stand-by mode.
No. 1 Compressor Failure
No. 2 Compressor Failure
0403
4200
4220
4230
4240
4250
5110
5301
400 500
× ×
48 % 65 %
× ×
65 % 65 %
Abnormality Codes for
which Emergency
Operation is Impossible
Trouble codes other than
those at left.
–48–
Action
Emergency Operation only with the
No. 2 Compressor
* After the retry operation, even if
there is a different abnormality
code detected within <Inverter
Abnormality> at left, press the
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