Mitsubishi Electric MSZ-AY25VGKP-E6 Service Manual page 24

9-14. EMERGENCY/TEST OPERATION
In the case of test run operation or the emergency operation, use the emergency operation switch on the right side of the
indoor unit. The emergency operation is available when the remote controller is missing or has failed, or the batteries in the
remote controller are running down. The unit will start and OPERATION INDICATOR lamp will light up.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The indoor fan runs at High speed
and the temperature control does not work.
After 30 minutes of test run operation, the system shifts to EMERGENCY COOL/HEAT MODE with a set temperature of
24°C. The fan speed shifts to Med.
The coil frost prevention works even in the test run or the emergency operation.
In the test run or the emergency operation, the horizontal vane operates in VANE AUTO ( ) mode.
The emergency operation continues until the emergency operation switch is pressed once or twice or the unit receives any
signal from the remote controller. In the latter case, normal operation will start.
NOTE: Do not press the emergency operation switch during normal operation.
9-15. 3-MINUTE TIME DELAY OPERATION
When the system turns OFF, compressor will not restart for 3 minutes as 3-minute time delay function operates to protect
compressor from overload.
OBH930
Emergency
operation switch
(E.O. SW)
COOL/HEAT
Operation mode
Set temperature 24°C
Fan speed Med.
Horizontal vane Auto
The operation mode is indicated by the Operation
Indicator lamp as following
Operation Indicator lamp
EMERGENCY COOL
↓
EMERGENCY HEAT
↓
STOP
24
Lit
Not lit