Midea Forest MOAA31-12CN1-NB8, Technical Manual

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 Page 31 

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1.6.3  Outdoor Fan Control

For on-off models, outdoor units just have one single fan 
speed. The operation of outdoor fan is consistent with the 
operation of compressor, except the following situations.

•  High temperature protection of evaporator
•  Defrosting
•  Current protection

1.6.4  Defrosting mode 

•  The unit enters defrosting mode according to the 

temperature difference between T2 and T1, as well as 
the compressor runtime.

•  In defrosting mode, the compressor continues to run, 

the indoor and outdoor motor will cease operation, 
the defrost light of the indoor unit will turn on, and 

the “

” symbol is displayed.

•  If any one of the following conditions is satisfied, 

defrosting ends and the machine switches to normal 
heating mode:

•  Compressor current is over than I

defrost 

and lasts for 

7s

•  The defrosting time has reached the setting value.
•   T2≥2°C(3.6°F) after entering defrosting mode for 3 

minutes.

•  After entering defrosting mode for 2 minutes, 

check the value of T2. The minimum temperature 
of T2 is marked as T2min. If T2-T2min≥2°C(3.6°F) 
during the following 4 minutes, AC will exit 
defrosting mode(if T2≤-15°C(5°F),considers it as 
-15°C(5°F)).

1.6.5  Evaporator Temperature Protection

When the evaporator temperature exceeds a preset 
protection value, the compressor stops.

1.7  Auto-mode

•  This mode can be selected with the remote controller

.

•  In auto mode, the machine selects cooling, heating, or 

fan-only mode on the basis of 

∆

T (

∆

T =T1-Ts).

∆T

Running mode

∆T>2

℃

Cooling

-3

℃

≤∆T≤2

℃

Fan-only

∆T<-3

℃

Heating*

Heating*: In auto mode, cooling only models run the fan

•  AC will run in auto mode in the below cases:

•  Pressing the forced auto button.
•  If AC is off, it will run in auto mode when the timer 

on function is active.

•  After setting the mode, AC will run in auto mode if 

the compressor keeps not running for certain time.

1.8  Drying mode

•  The compressor is cycled running with 10 minutes 

on and then 5 minutes off. The indoor fan will keep 
running at low speed.

•  In drying mode, if room temperature is lower than 

10

°C

, the compressor will stop and not resume until 

room temperature exceeds 13

°C

.

•  The evaporator anti-freezing protection is the same as 

that in cooling mode.

1.9  Forced operation function

•  Forced cooling mode:

The compressor and outdoor fan continue to run and 
the indoor fan runs at low speed. After running for 30 
minutes, the AC will switch to auto mode with a preset 
temperature of 24°C.

•  Forced auto mode:

Forced auto mode operates the same as normal auto mode 
with a preset temperature of 24°C.

•  The unit exits forced operation when it receives the 

following signals:

•  Switch on 
•  Switch off 
•  Timer on 
•  Timer off 
•  Changes in:

•  mode
•  fan speed
•  sleeping mode

1.10  Auto-Restart function

•  The indoor unit has an auto-restart module that 

allows the unit to restart automatically. The module 
automatically stores the current settings (not including 
the swing setting) and, in the case of a sudden power 
failure, will restore those setting automatically within 3 
minutes after power returns.

•  If the unit was in forced cooling mode, it will run in 

this mode for 30 minutes and turn to auto mode with