Cool Mode Of “I Feel Control”; Coil Frost Prevention; Dry Mode Of “I Feel Control” - Mitsubishi Electric MSZ-G09SV Service Manual

9-1-1. Cool mode of "I FEEL CONTROL"
1. Indoor fan speed control
Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button
regardless of the thermostat's OFF-ON.
In AUTO the fan speed is as follows.
<MSZ-09SV - , MSZ-G12SV -
E1
Room temperature minus set temperature: 2 degrees or moreover·····························High
Room temperature minus set temperature: Between 1 and 2 degrees ·······················Med.
Room temperature minus set temperature: less than 1 degree····································Low
<MSZ-09SV - , MSZ-G12SV -
E2
Room temperature minus set temperature : 1.7 degrees or more ·······························High
Room temperature minus set temperature : Between 1 and 1.7 degrees·······················Med.
Room temperature minus set temperature : less than 1 degree ·································Low

2. Coil frost prevention

1 Temperature control
The operational frequency of the compressor is controlled based on the temperature of the indoor coil thermistor(RT12).
Temperature of indoor coil thermistor:RT12
Approx. 8°C or above
Approx. 6°C to 8°C
Approx. 4°C to 6°C
Approx. 4°C or below
The indoor fan maintains the actual speed of the moment.
2 Time control
When the three conditions as follows have been satisfied for 1 hour and 45 minutes, compressor stops for 3 minutes.
The indoor fan operates at set speed.
a. Compressor has been continuously operating.
b. Indoor fan speed is Low or Med.
c. Room temperature is below 26:.
When compressor stops, the accumulated time is cancelled. When compressor restarts, time counting starts from the
beginning.
Time counting also stops temporarily when the indoor fan speed becomes High or the room temperature exceeds 26:.
However, when two of the above conditions(b and c.) are satisfied again. Time accumulation is resumed.
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 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.
In Auto fan speed becomes Very Low.
2. The operation of the compressor and indoor fan/ outdoor fan
Compressor operates by temperature control and time control.
1 Set temperature is controlled to fall 2°C from initial set temperature.
2 Indoor fan and outdoor fan operate in the same cycle as the compressor.
3 Operational frequency of compressor during operation is fixed to G09:45Hz / G12:30Hz.
NOTE Coil frost prevention during DRY mode of "I FEEL CONTROL"
The operation is same as coil frost prevention during COOL mode of "I FEEL CONTROL" .
Initial temperature difference
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E1
>
E2
Lower at the rate of 6Hz/min
Compressor is turned OFF for 5 minutes when temperature of
indoor coil thermistor continues approx. 4°C or below for 5 minutes
or more.
Fan speed
Operation frequency
Normal
Fixed
Lower at the rate of 3Hz/min.
37
Difference between room
temperature and set tem-
perature during operation.
4 deg.
2 deg.
1 deg. 1.7 deg.
3 deg.
1 deg. 1.7 deg.