Emergency-Test Operation - Mitsubishi Electric Mr. Slim MSH09NW Service Manual

9-8. 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 POWER MONITOR 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/HEAT MODE with a set temperature of
75˚F.
The fan shifts to Me speed.
This operation continues until the EMERGENCY OPERATION switch is pressed or a button on the remote controller is
pressed, then normal operation will start.
The coil frost prevention circuit operates in this operation, and defrosting operates too.
In the test run or emergency operation, the horizontal vane operates in AUTO mode a the set temperature of 75˚F.
Defrosting of outdoor heat exchanger works in EMERGENCY HEAT MODE.
NOTE : Do not press the EMERGENCY OPERATION switch during normal operation.
MSH09NW
MSH12NN
MSH15NN
MSH17NN
40
Emergency operation
switch
Emergency operation
switch
Press once
<Cool>
Press again
<Heat>
Press once again
<Stop>