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EMERGENCY OPERATION switch
E.O.
SW
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 (
) mode.
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.
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Jun. 2008. No. OB450 REVISED EDITION-C 6
Distributed in May 2007. No. OB450 REVISED EDITION-B 7
Distributed in Dec. 2006. No. OB450 REVISED EDITION-A 7
Distributed in Apr. 2006. No. OB450 7
Made in Japan
New publication, effective Jun. 2008
Specifications subject to change without notice.
11-10. Changing temperature indication (°F/°C)
The preset unit is °F.
Press RESET button while
the temperature buttons
are pressed.
Press RESET button gently
using a thin stick.
MSZ-A•NA-
1
MSY-A•NA-
1
Operation mode COOL HEAT (MSZ)
Set temperature 75°F 75°F
Fan speed Med. Med.
Horizontal vane Auto Auto
The operation mode is indicated by the Operation
Indicator lamp as following
Lighted
Not lighted
MSZ type
EMERGENCY
COOL
↓
EMERGENCY
HEAT
↓
STOP
MSY type
EMERGENCY
COOL
↓
STOP