Mitsubishi Electronics MUZ-FDNA - U Manuel D’Utilisation

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(2) Mode change

In case of the following conditions, the operation mode is changed.

COOL mode changes to HEAT mode when 15 minutes have passed with the room temperature 4 °F below the set 

temperature.

HEAT mode changes to COOL mode when 15 minutes have passed with the room temperature 4 °F above the set 

temperature.

In the other cases than the above conditions, the present operation mode is continued.

NOTE1: Mode selection is performed when multi standby (refer to NOTE2) is released and the unit starts operation with 

ON-timer.

NOTE2: If two or more indoor units are operating in multi system, there might be a case that the indoor unit, which is  

operating in AUTO ( 

 ), cannot change over the other operating mode (COOL 

 HEAT) and becomes a state 

of standby.

(3) Indoor fan control/ Vane control

As the indoor fan speed and the horizontal vane position depend on the selected operation mode, when the operation 
mode changes over, they change to the exclusive ones. 

       Fan speed is switched according to the compressor frequency.

1. Horizontal vane
(1) Cold air prevention in HEAT operation (MUZ)

When any of the following conditions occurs in HEAT operation, the vane angle changes to Horizontal position automati-
cally to prevent cold air blowing on users.

 Compressor is not operating.
 Defrosting is performed.
 Indoor coil thermistor temperature does not exceed 102 °F within about 3 minutes after compressor starts.

NOTE: When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat off, 

this control doesn’t work in the indoor unit. 

(2) ECONO COOL (   ) operation (ECONOmical operation)
 

When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 3.6 °F higher than that in 
COOL mode.

 

Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger (indoor coil 
thermistor).

 

SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher than that 
in COOL mode, the air conditioner can keep comfort. As a result, energy can be saved.

 

ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL button is 
pressed or change to other operation mode.

<Relation between compressor frequency and fan speed>

Compressor frequency (Hz)

Down

Up

33

44

33

44

39

54

Fan speed

High

Low

Down

Up

Compressor frequency

Min.

Max.