Emergency/Test Operation; 3-Minute Time Delay Operation; Emergency Cool; Emergency Heat - Mitsubishi Electric MSZ-FT25VG-E1 Service Manual

9-12. EMERGENCY/TEST OPERATION

In the case of test run operation or emergency operation, use EMERGENCY OPERATION switch in the right side of the
indoor unit. Emergency operation is available when the remote controller is missing or has failed, or when 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 Medium. The coil frost prevention works even in the test run or the emergency operation.
In the test run or emergency operation, the horizontal vane operates in VANE AUTO ( ) mode.
Emergency operation continues until 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 EMERGENCY OPERATION switch during normal operation.

9-13. 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 pro-
tect compressor from overload.
OBH864
Operation mode
Set temperature
Fan speed
Horizontal vane
The operation mode is indicated by the Operation
Indicator lamp as following
Operation Indicator lamp

EMERGENCY COOL

EMERGENCY HEAT

STOP
21
COOL/HEAT
24°C
Med.
Auto
Lit
↓
Not lit
↓