Mitsubishi Electric MUFZ-KJ-NAHZ Series Service Manual page 20

8-11. EMERGENCY/TEST OPERATION
In the case of test run operation or emergency operation, use
EMERGENCY OPERATION switch on 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. In COOL/HEAT MODE, the air outlet selection is
set to 2 FLOW during the test run operation. However, 2 FLOW opera-
tion in HEAT MODE is the same operation as the case that 2 FLOW
operation is selection by the remote controler.
After 30 minutes of test run operation, the system shifts to
EMERGENCY COOL/HEAT MODE with a set temperature of 75°F
(24°C). The fan speed shifts to Medium.
In EMERGENCY COOL/HEAT MODE, the air outlet selection is set to
2 FLOW. 2 FLOW operation is the same operation as the case that 2
FLOW operation is selection by the remote controler.
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.
8-12. 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.
8-13. Changing temperature indication (°F/°C)
• The preset unit is °F.
• °F °C: Press RESET button while the TEMPERATURE buttons are pressed.
• °C °F: Press RESET button while the TEMPERATURE buttons are pressed.
Operation mode
Set temperature
Fan speed
Horizontal vane
Air outlet
The operation mode is indicated by the Operation
Indicator lamp as following
Operation Indicator lamp
EMERGENCY COOL
EMERGENCY HEAT
STOP
Emergency
operation switch
(E.O. SW)
20
COOL/HEAT
75°F (24°C)
Medium
Auto
2 FLOW
Lighted
Not lighted
Press RESET button gently
using a thin instrument.