High - Mitsubishi Electric MCFH-13NV-E4 Service Manual

3. Outdoor fan control <MUCFH-24NV -
Outdoor fan speed is controlled according to the temperature of ambient temperature
thermistor RT63.
Outdoor fan Low operation : When the outside temperature decreases to 28.5°C or less.
Outdoor fan High operation : Until when the outside temperature decreases to 28.5°C.
9-1-2. DRY mode of "I FEEL CONTROL"
The system for dry operation uses the same refrigerant circuit as the cooling circuit.
The compressor and the indoor fan are controlled by the room temperature.
By such controls, indoor air flow amounts will be reduced in order to lower humidity without much room temperature
decrease.
1. Indoor fan speed control
Indoor fan operates at the set speed by FAN SPEED CONTROL button.
However, in AUTO fan operation, fan speed becomes Low.
2. The operation of the compressor and indoor/ outdoor fan
Compressor operates by room temperature control and time control.
Set temperature is controlled to fall 2°C from initial room temperature.
Indoor fan and outdoor fan operate in the same cycle as the compressor.
• When the room temperature is 23°C or over:
When the thermostat is ON, the compressor repeats 8 minutes ON and 3 minutes OFF.
When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.
• When the room temperature is under 23°C.
When the thermostat is ON, the compressor repeats 2 minutes ON and 3 minutes OFF.
When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.
Operation time chart
Example
OFF
Thermostat
Indoor fan OFF
Outdoor fan OFF
Compressor
3. Coil frost prevention
• The operation is as same as coil frost prevention during COOL mode of "I FEEL CONTROL".
• Indoor fan operates at the set speed and the compressor stops for 5 minutes, because protection (Coil frost
prevention) has the priority.
However, when coil frost prevention works while the compressor is not operating, it's speed becomes Low.
9-1-3. HEAT mode of "I FEEL CONTROL"
1. Indoor fan speed control
(1) In AUTO the fan speed is as follows.
Set temperature minus room temperature: 2 degrees or more ···························High
Set temperature minus room temperature: Between 1 and 2 degrees ···············Med.
Set temperature minus room temperature: less than 1 degree ···························Low
>
E3
Until when the outside temperature goes to 31°C.
When the outside temperature goes to 31°C or more.
ON
ON
ON
OFF
ON
ON
OFF
8 min.
3 min.
Initial temperature difference
OFF
ON
OFF
ON
OFF
4 min.
1 min.
Fan speed
34
Ambient temperature
thermistor RT63 temperature
Outdoor fan speed
Low
28.5:31:
ON
Difference between room
temperature and set temperature
during operation
2deg. 4deg.
1deg. 1.7deg.

High