Mitsubishi Electric SLH Series Technical & Service Manual page 52

(2) Indoor fan control
1 Cold air prevention control
The fan runs at set speed when the indoor coil thermistor RT12 temperature exceeds 22°C. The fan operates at VLo
when the temperature is below 18°C. But the fan stops when the indoor fan operates at VLo and the room temperature
is 15°C or less.
NOTE : At initial in hysteresis this control works.
2 New warm air control.
When compressor starts in heating operation or after defrosting, the fan changes the speed with dependence on the
indoor coil thermistor RT12 temperature to blow out warm air.
After releasing of cold air prevention, when the indoor coil temperature is 37°C or above, the fan speed shifts to the set
speed, and when the fan speed is changed by the remote controller, the fan speed is the set speed.
When the indoor coil temperature is less than 37°C, the fan speed is controlled by time as below.
<Time condition>
• Less than 2 minutes·······································LOW
• 2 minutes or more, less than 4 minutes ········MED.
• 4 minutes or more··········································HIGH
The upper limit of the fan speed is the set speed.
If the thermostat turns off, this operation changes to flow soft control.
3 Flow soft control
After the thermostat turns off, the indoor fan operates at VLo.
NOTE : When the thermostat turns on, the fan operates at the set speed. Due to the cold air prevention control, the fan
does not start until the indoor coil thermistor RT12 reads 22°C or more.
4 Follow the item (6) during defrosting.
(3) Auto vane control
Auto vane position is set to 70 degrees airflow at the start-up of HEAT operation. It can then be changed by the remote
controller.
( i ) At start-up of HEAT operation, the auto vane is set to 70 degrees airflow direction.
( ii ) Discharge direction can be changed with
1
1 Horizontal airflow 30°
2 Downward airflow 45°
3 Downward airflow 55°
In the following cases, airflow direction becomes 30° regardless of the remote controller setting.
1 During the cold air prevention control with fan speed at VLo
2 During defrosting with indoor fan OFF
3 During the thermostat OFF
(4) Outdoor fan control
POWER ON/OFF with the compressor. However during defrosting, follow the item (5).
(5) Reversing valve
Heating · · · · · ON
Cooling · · · · · OFF
Dry · · · · · · · · OFF
NOTE: The Reversing valve reverses for 5 seconds right before start-up of the compressor.
Compressor
Reversing valve
Outdoor fan
Released
Cold Air Prevention
<Indoor fan speed>
button.
2 3
4 Downward airflow 70°
5 Swing
(COOL / DRY)
5 sec.
ON
OFF
ON
OFF
ON
OFF
18°C
22°C
4 5
(HEAT)
5 sec.
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