Mitsubishi Electric MSZ-FE12NA Service Manual download pdf (Page 20)

(Example 1) The current time is 8:00 PM.

The unit turns off at 11:00 PM, and on at 6:00 AM.

• OFF timer and ON timer can be used in combination. The timer of the set time that is reached first will operate first.

• “ ” and “ ” display shows the order of OFF timer and ON timer operation.

PROGRAM TIMER

(Example 2) The current time is 11:00 AM.

The unit turns on at 5:00 PM, and off at 9:00 PM.

NOTE: If the main power is turned OFF or a power failure occurs while ON/OFF timer is active, the timer setting is can-

celled. As these models are equipped with an auto restart function, the air conditioner starts operating with timer

cancelled when power is restored.

Emergency

operation switch

(E.O. SW)

8-9. EMERGENCY/TEST OPERATION

In 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, has failed or the batteries of the

remote controller run down. The unit will start and AREA lamp (MSZ-FE09/12NA)/OPERATION INDICATOR lamp (MSZ-

FE18NA) will light.

The first 30 minutes of operation is the test run operation. This operation is for servicing.

The indoor fan runs at High speed and temperature control does not work.

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 Med.

All protective operations such as 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 case of latter, normal operation will start.

NOTE: Do not press EMERGENCY OPERATION switch during normal operation.

Operation mode COOL HEAT

Set temperature 75°F (24°C) 75°F (24°C)

Fan speed Med. Med.

Horizontal vane Auto Auto

Vertical vane

MSZ-FE09/12NA

Straight Straight

The operation mode is indicated by the AREA lamp as following

NOTE:

This is the indication of EMERGENCY OPERATION mode.

AREA setting is not available during EMERGENCY OPERATION.

Lighted

Not lighted

AREA lamp L AREA R

EMERGENCY

COOL

↓

EMERGENCY

HEAT

↓

STOP

MSZ-FE09NA MSZ-FE12NA

MSZ-FE18NA

Emergency

operation switch

(E.O. SW)

EMERGENCY COOL

↓

EMERGENCY HEAT

↓

STOP

Lighted

Not lighted

MSZ-FE09NA MSZ-FE12NA

MSZ-FE18NA

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Mitsubishi Electric MSZ-FE12NA Service Manual Page 20

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