Mitsubishi Electric CITY MULTI PUHY-400YMF-B, Service Handbook

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(13) Operation Mode
1) Operating modes of the indoor unit
The following five modes can be set by the remote control.
1
Cooling mode
2
Heating mode
3
Dry mode
4
Fan mode
5 Stop mode
2) Operating modes of the outdoor unit
The following are the 3 modes for the outdoor unit.
1
Cooling mode All indoor units are operated in cooling mode
2
Heating mode All indoor units are operated in heating mode
3
Stop mode All indoor units are in fan or stop mode
Note : If the outdoor unit has been in the cooling mode and the other indoor units (in stop, fan, thermostat off) are set
to the heating mode, those indoor units will not be operated and the heating indicator will be flashed on the
remote controller. The reverse also applies when the outdoor unit is operated in the heating mode and the
cooling indicator will be flashed on the remote controller.
(14) 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 trouble reset using the remote control.
1) Starting the Emergency Operation Mode
1 Trouble occurs (Display the trouble code root and trouble code on the remote control).
2
Carry out trouble reset with the remote control.
3
If the trouble 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 trouble reset (without entering the emergency operation mode).
4 If the same trouble 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 trouble.
Table Emergency Operation Mode Patterns and Trouble 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
Trouble 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 trouble code
detected within <Inverter
Trouble> 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
Serial transmission trouble 0403
VDC sensor/circuit trouble 4200
Breaking of overcurrent 4210
Bus voltage trouble 4220
Radiator panel overheat
protection
4230
Overcurrent protection 4240
Cooling fan trouble 4260
Thermal sensor trouble
(Radiator panel)
5110
IDC sensor/circuit trouble 5301
Overcurrent protection
400 500
No. 1 Compressor Failure
×
48 %
×
65 %
No. 2 Compressor Failure
×
65 %
×
65 %