Mitsubishi Electric MSZ-A09NA Service Manual page 48

11-9. EMERGENCY/TEST OPERATION
In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoor
unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote
controller run down. The unit will start and OPERATION INDICATOR lamp will light.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The Indoor fan speed runs at
High speed and the system is in continuous operation (with thermostat ON).
After 30 minutes of test run operation the system shifts to EMERGENCY COOL / HEAT MODE with a set temperature of
75°F. The fan speed shifts to Med..
All protective operations such as the coil frost prevention works even in emergency operation.
In the test run or emergency operation, the horizontal vane operates in VANE AUTO (
Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any
signal from the remote controller. In case of latter normal operation will start.
NOTE : Do not press EMERGENCY OPERATION switch during normal operation.
EMERGENCY OPERATION switch
C C Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Apr. 2006. No. OB450 7
Operation mode
Set temperature
Fan speed
E.O.
Horizontal vane
SW
The operation mode is indicated by the Operation
Indicator lamp on the indoor unit as following
Operation indicator lamp
(MSZ type)
Press once <Cool>
Press again <Heat>
Press once again <Stop>
(MSY type)
Press once <Cool>
Press again <Stop>
New publication, effective Apr. 2006
Specifications subject to change without notice.
) mode.
HEAT
COOL
(MSZ)
75°F
75°F
Medium Medium
Auto Auto
Lighted
Not lighted