Mitsubishi Electric MS-09SN-C1, Service Manual

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Mode
COOL mode of
"I FEEL CONTROL"
DRY mode of
"I FEEL CONTROL"
Initial room temperature
Initial set temperature
more than 13 : , less than 25 :
24 :
Initial room temperature
minus 2
:
Initial room temperature
minus 2
:
❈
1
26 : or more
25 : to 26 :
(4) The initial set temperature is decided by the initial room temperature.
❈
1 When the system is restarted with the remote controller, the system operates with the previous set temperature regard-
less of the room temperature at restart.
The set temperature is calculated by the previous set temperature.
(5) TEMPERATURE buttons
In “I FEEL CONTROL” ( ) mode, set temperature is decided by the microprocessor based on the room temperature.
In addition, set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too
warm. Each time the TOO WARM or TOO COOL button is pressed, the indoor unit receives the signal and emits a
beep tone.
●
Fuzzy control
When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, considering
the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user’s preference to heat
or cool. So this is called “Fuzzy control”, and works only in “I FEEL CONTROL” mode.
In DRY mode of “I FEEL CONTROL”, the set temperature doesn’t change.
… To raise the set temperature 1~2 degrees(°C)
… To lower the set temperature 1~2 degrees(°C)
1 deg. 1.7 deg.
2 deg. 4 deg.
8-1-1. COOL mode of “I FEEL CONTROL”
1. Indoor fan speed control
Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button regard-
less of thermostat’s OFF-ON.
In Auto the fan speed is as follows.
MS-09/10/12/15/17/24SN-
Initial temperature difference
Room temperature minus set temperature : 2 degrees or more·······························High
Room temperature minus set temperature : Between 1 and 2 degrees···················Med.
Room temperature minus set temperature : less than 1 degree·······························Low
C1
2. Coil frost prevention
①
Temperature control
When the indoor coil thermistor RT12 reads 4°C or below(MS-09/10SN) / -1°C or below(MS-12/15/17/18/24SN) for 5 min-
utes, the coil frost prevention mode starts.
The indoor fan operates at the set speed and the compressor stops for 5 minutes.
After that, if RT12 still reads below 4°C(MS-09/10SN) / or below -1°C(MS-12/15/17/18/24SN), this mode is prolonged until
the RT12 reads over 4°C(MS-09/10SN) / -1°C(MS-12/15/17/18/24SN).
Fan speed
Difference between room
temperature and set tem-
perature during operation
TOO
COOL
TOO
WARM
②
Time control
When the three conditions as follows have been satisfied for 1 hour and 45 minutes, the compressor stops for 3 minutes.
The indoor fan operates at the set speed.
a. Compressor has been continuously operating.
b. Indoor fan speed is Low or Med..
c. Room temperature is below 26°C.
1 deg. 1.7 deg.
3 deg.
MS-09/10/12/15SN- , MS-18SN-
Initial temperature difference
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
C1 C2
Fan speed
Difference between room
temperature and set tem-
perature during operation
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