Mitsubishi Electric MS-A08ND, MS-A10ND, MS-A12ND, MS-A15ND, MU-A08ND Service Technical Manual
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SERVICE TECHNICAL GUIDE
SPLIT-TYPE, AIR CONDITIONERS
Wireless type
Models
No. OBT10
MS-A08ND MS-A10ND MS-A12ND MS-A15ND -
(WH)
(WH)
(WH)
(WH)
CONTENTS
MICROPROCESSOR CONTROL
1.“I FEEL CONTROL” OPERATION·································2
2. COOL OPERATION ·······················································5
3. DRY OPERATION··························································5
4. FAN OPERATION ··························································5
5. FAN MOTOR CONTROL···············································5
6. AUTO VANE OPERATION·············································5
7. TIMER OPERATION ······················································7
8. EMERGENCY / TEST OPERATION······························7
· MU-A08ND -
· MU-A10ND -
· MU-A12ND -
· MU-A15ND -
C1C1
C1C1
C1C1
C1C1
TM
MICROPROCESSOR CONTROL
Signal transmitting section
Operation display section
TEMPERATURE buttons
VANE CONTROL button
TIME SET button
RESET button
FAN SPEED CONTROL button
ECONO COOL button
POWERFUL COOL button
OPERATION SELECT button
TIMER MODE SELECT button
OPERATE/STOP (ON/OFF) button
Lighted
Not lighted
Approx. 2 :
or more
Difference
between target
temperature
and room
temperature
Approx. 2 :
or less
This shows that the
air conditioner is
operating to reach
the target temperature.
Please wait unit the
target temperature is
obtained.
This shows that the
room temperature is
approaching the
target temperature.
Operation stateIndication
Operation Indicator
Operation Indicator lamp
The operation indicator at the right side of the indoor
unit indicates the operation state.
INDOOR UNIT DISPLAY SECTION
• The following indication applies regardless of shape
of the indicator.
MS-A08ND - MS-A10ND - MS-A12ND - MS-A15ND MU-A08ND - MU-A10ND - MU-A12ND - MU-A15ND -
WIRELESS REMOTE CONTROLLER
C1C1C1C1
C1C1C1C1
Once the operation mode are set, the same operation mode
can be repeated by simply turning the
OPERATE/STOP(ON/OFF) button ON.
Indoor unit receives the signal with a beep tone.
When the system turns off, compressor will not restart for 3
minutes as 3-minute time delay function operates to protect
compressor from overload.
1. “I FEEL CONTROL” () OPERATION
(1) Press OPERATE/STOP(ON/OFF) button on the remote
controller. OPERATION INDICATOR lamp of the indoor
unit turns on with a beep tone.
(2) Select “I FEEL CONTROL”( ) mode with the
OPERATIONSELECT button.
(3) The operation mode is determined by the initial room
temperature at start-up of the operation.
Initial room temperature
25°C or more
more than 13°C,
less than 25°C
● Once the mode is fixed, the mode does not change by
room temperature afterwards.
● Under ON-TIMER ( ) operation, the mode is deter-
mined according to the room temperature at set time the
operation starts.
● When the system is stopped by the remote controller and
restarted within 2 hours in “I FEEL CONTROL” ( )
mode, the system operates in previous mode automatically
regardless of the room temperature.
Operation time chart
Example
Previous operation
COOL mode of
“I FEEL CONTROL”
or COOL mode
When the system is restarted after 2 hours and
more, the operation mode is determined by the
room temperature at start-up of the operation.
Operation time chart
Example
Previous operation
COOL mode of
“I FEEL CONTROL”
or COOL mode
Mode
COOL mode of
“I FEEL CONTROL”
DRY mode of
“I FEEL CONTROL”
Restart
COOL mode of
“I FEEL CONTROL”
Restart
COOL or DRY mode of
“
I FEEL CONTROL”
determined
temperature at start-up
of the operation.
that
by room
2
TOO
COOL
TOO
WARM
(4) The initial set temperature is decided by the initial room temperature.
Mode
COOL mode of
“I FEEL CONTROL”
DRY mode of
“I FEEL CONTROL”
Initial room temperature
26°C or more
25°C to 26°C
more than13°C, less than 25°C
Initial set temperature
24°C
Initial room temperature
minus 2
°C
Initial room temperature
minus 2 °C
❈ 1
❈1 When the system is restarted with the remote controller, the system operates with the previous set temperature
regardless 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
cold. 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 (:)
…
To lower the set temperature 1 ~ 2 degrees (:)
COOL mode of “I FEEL CONTROL”
1-1.
1. Thermostat control
Thermostat is ON or OFF by difference between room temperature and set temperature
Difference between room
temperature and set temperature during operation
Initial temperature difference Thermostat
Room temperature minus set temperature : 0.3 : or more················································ON
Room temperature minus set temperature : less than -0.3 :············································OFF
2. Indoor fan speed control
Indoor fan operates at the set speed by FAN SPEED CONTROL button.
In Auto the fan speed is as follows.
Initial temperature difference Fan speed
Room temperature minus set temperature : 1.7 degrees or more····························High
Difference between room
temperature and set temperature during operation
Room temperature minus set temperature : Between 1 and 1.7 degrees················Med.
Room temperature minus set temperature : less than 1 degree······························Low
1 deg.
3. Coil frost prevention
① Temperature control
When the indoor coil thermistor RT12 reads 6°C or below for 5 minutes, 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 6°C, this mode is prolonged until the RT12 reads over 6°C.
Set temperature
-0.3 :
0.3 :
1.7 deg.
3 deg.
3
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