Emergency Operation - Mitsubishi Electric PLA-RP1.6AA Service Manual

10-4. EMERGENCY OPERATION

10-4-1. When wireless remote controller troubles or its battery is exhausted
1. Emergency operation is available in such a case using emergency operation switch equipped next to the receiver of indoor
unit.
2. To start operation
• Cooling Operation·······Press
Heating Operation·······Press
•
wWhen the unit starts operating, the operation lamp is lit.
Emergency operation switch (cooling)
Emergency operation switch (heating)
Receiver
Operation lamp
wEmergency operation will be performed as follows.
Mode
Set temperature
Fan speed
Airflow direction
3. To stop operation
• Press either emergency operation switch (cooling/heating).
10-4-2. When wired remote controller or indoor unit micro computer troubles
1. If there is not any other wrong when trouble occurs, emergency operation starts as the indoor controller board switch (SWE)
is set to ON.
During the emergency operation the indoor unit is as follows;
(1) Indoor fan high speed operation
2. When emergency operating for COOL or HEAT, setting of the switch (SWE) in the indoor controller board and outdoor unit
emergency operation are necessary.
3. Check items and notices as the emergency operation
(1) Emergency operation cannot be used as follows;
• When the outdoor unit is something wrong.
• When the indoor fan is something wrong.
• When drain over flow protected operation is detected during self-diagnosis. (Error code : P5)
(2) Emergency operation will be serial operation by the power supply ON/OFF.
ON/OFF or temperature, etc. adjustment is not operated by the remote controller.
(3) Do not operate for a long time as cold air is blown when the outdoor unit starts defrosting operation during heat emer-
gency operation.
(4) Cool emergency operation must be within 10 hours at most. It may cause heat exchanger frosting in the indoor unit.
(5) After completing the emergency operation, return the switch setting, etc. in former state.
(6) Since vane does not work at emergency operation, position the vane manually and slowly.
(Cooling) switch.
(Heating) switch.
Cooling
24:
High
Horizontal (30deg)
(2) Drain pump operation
Heating
24:
High
Downward (70deg)
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