Mitsubishi Electric Mr.Slim PCA-M35KA2 Service Manual page 29

9-5. EMERGENCY OPERATION
9-5-1. When wireless remote controller fails or its battery is exhausted
9-5-2. When wired remote controller or indoor unit microprocessor fails
1.When the wired remote control has failed, but all other components work properly,
setting the switch (SWE) on the indoor controller board ON will begin the indoor unit emergency operation.
When emergency operation is activated, the indoor unit operates as follows:
(1) Indoor fan is running at high speed. (2) Drain pump is operating. (option)
Note on the wireless remote control: when the remote control does not function, it is possible to activate
emergency operation by using the indoor unit emergency operation switch (SW1, SW2 of the wireless signal
receiver board).
2.When you activate emergency operation of the cooling or heating, you have to set the switch (SWE) on the indoor
controller board and activate emergency operation of the outdoor unit.
For details on how to activate emergency operation of the outdoor unit, refer to the outdoor unit wiring diagram.
Note: Emergency operation will not work unless outdoor unit is PU series.
3.Before you activate emergency operation, check the following points:
(1) Emergency operation cannot be activated when:
• the outdoor unit malfunctions.
• the indoor fan malfunctions.
• it has detected the malfunction of drain pump during self-diagnosing.
(2) Emergency operation becomes continuous only by switching the power source on/off.
ON/OFF on the remote control or temperature control etc. does not function.
(3) Avoid operating for a long time when the outdoor unit begins defrosting while emergency operation
of the heating is activated because it will start to blow cold air.
(4) Emergency cooling should be limited to 10 hours maximum (The indoor unit heat exchanger may freeze).
(5) After emergency operation has been deactivated, set the switches etc. to their original positions.
(6) Movement of the vanes does not work in emergency operation, therefore you have to slowly set them
manually to the appropriate position.
OCH752
When the remote controller cannot be used
When the batteries of the remote controller run out or the remote controller
malfunctions, the emergency operation can be done using the emergency
buttons on the grille.
A Defrost/STAND BY lamp
B Operation lamp
C Emergency operation switch (heating)
D Emergency operation switch (cooling)
E Receiver
Starting operation
• To operate the cool mode, press the
seconds.
• To operate the heat mode, press the
seconds.
Note: Lighting of the Operation lamp B means the start of operation.
Details of emergency mode are as shown below.
Operation mode
Set temperature
Fan speed
Airflow direction
Finishing operation
• To finish operation, press the
29
button D for more than 2
button C for more than 2
Cool Heat
24°C 24°C
High High
Horizontal Downward 5
button D or the button C .