Mitsubishi MS09NW Service Manual page 29

8. EMERGENCY-TEST OPERATION
When the remote controller is missing, has failed or the batteries run down, press the EMERGENCY OPERATION switch
on the front of the indoor unit. The unit will start and the OPERATION INDICATOR lamp will light.
The first 30 minutes of operation will be the test run operation. This operation is for servicing. The indoor fan runs at high
speed and the system is in continuous operation. The thermostat is ON and the timer is reset to normal.
After 30 minutes of test run operation the system shifts to EMERGENCY COOL MODE with a set temperature of 75°F
The fan shifts to MED speed.
This operation continues until the EMERGENCY OPERATION switch is pressed again or any button on the remote con-
troller is pressed,and after that normal operation will start.
The coil frost prevention circuit operates in this mode.
In the test run or Emergency operation, auto vane operates in AUTO mode with the set temperature 75°F.
NOTE : Do not press the EMERGENCY OPERATION switch during normal operation.
MS09NW
MS12NN
MS15NN
MS17NN
Emergency operation
switch
Emergency operation
switch
Press once
<Cool>
Press again
<Stop>
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