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 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 thermostat is ON, but 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 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

Straight

Straight

 

 

 

The operation mode is indicated by the AREA lamp as following

AREA lamp L AREA R

EMERGENCY

COOL

EMERGENCY

HEAT

STOP

Lighted Not lighted

NOTE:

This is the indication of EMERGENCY OPERATION mode.

AREA setting is not available during EMERGENCY OPERATION.

8-10. 3-MINUTE TIME DELAY OPERATION

When the system turns OFF, compressor will not restart for 3 minutes as 3-minute time delay function operates to protect compressor from overload.

8-11. Changing temperature indication (°F/°C)

The preset unit is °F.

°F→°C : Press RESET button while the

temperature buttons are pressed.

• °C→°F : Press RESET button or remove the batteries .

Press RESET button gently using a thin stick.

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Mitsubishi Electronics MSZ-FD09NA service manual EMERGENCY/TEST Operation, Minute Time Delay Operation

MSZ-FD09NA specifications

The Mitsubishi Electronics MSZ-FD09NA is a wall-mounted split-type air conditioning unit that exemplifies the brand's commitment to efficiency, comfort, and advanced technology. This unit is designed to provide optimal cooling and heating solutions for residential and light commercial spaces, ensuring a comfortable environment year-round.

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The MSZ-FD09NA is equipped with Mitsubishi’s advanced inverter technology, which allows the compressor to adjust its speed according to the desired temperature. This ensures that energy is used efficiently and that fluctuations in temperature are minimized, resulting in enhanced comfort levels. The inverter technology also helps in reducing noise levels, creating a quieter operation compared to traditional HVAC systems.

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