Dry Mode Of “I Feel Control”; The Operation Of The Compressor And Indoor/ Outdoor Fan - Mitsubishi Electric Mr.Slim MSZ09UN Service Manual

OFF
Compressor and
Outdoor fan motor
ON
Indoor fan motor
8-1-2. 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 temperature.
By such controls, amount of air flow of indoor unit will be reduced in order to lower humidity without much room tempera-
ture drop.
MSZ09UN
1. Indoor fan speed control
Indoor fan operates at the set speed by FAN SPEED CONTROL button.
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 4˚F as initial set temperature.
Indoor fan and outdoor fan operate in the same cycle as the compressor.
Operational frequency control at compressor is fixed 30Hz.
Operation time chart
Example
OFF
Thermostat
Very
Indoor fan
Low
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, the speed becomes the set speed.
MSZ12UN
1. Indoor fan speed control
Indoor fan operates at the set speed by FAN SPEED CONTROL button.
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 4˚F as initial set temperature.
Indoor fan and outdoor fan operate in the same cycle as the compressor.
Operational frequency control at compressor is fixed 30Hz.
• When the room temperature is 73˚F 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 73˚F.
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.
ON
(continuously at set speed)
ON
ON
ON
ON
OFF
OFF
Very
Low
OFF
26
ON
ON
ON