INDOOR UNIT
No. OBH501
SERVICE MANUAL
Wireless type
Models
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
Outdoor unit service manual
MUZ-D•NA Series (OBH502)
MUY-D•NA Series (OBH502)
CONTENTS
·······································
1. TECHNICAL CHANGES
3
2. PART NAMES AND FUNCTIONS····················· 4
3. SPECIFICATION················································ 5
4. OUTLINES AND DIMENSIONS ························ 7
5. WIRING DIAGRAM············································ 8
6. REFRIGERANT SYSTEM DIAGRAM··············· 9
7. SERVICE FUNCTIONS ··································· 10
8. MICROPROCESSOR CONTROL ··················· 12
9. TROUBLESHOOTING····································· 19
10. DISASSEMBLY INSTRUCTIONS···················· 31
PARTS CATALOG (OBB501)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
TECHNICAL CHANGES
1
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
1. New model
3
2
PART NAMES AND FUNCTIONS
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
Air cleaning filter
(Anti-Allergy Enzyme Filter)
Front panel
Air filter
(Catechin air filter)
Air inlet
Emergency operation
switch
Air outlet
Operation indicator
lamp
Horizontal vane
Remote control
receiving section
Remote controller
MSZ-D30NA
ACCESSORIES
MSZ-D36NA
MSY-D30NA
MSY-D36NA
Installation plate
1
7
1
2
2
1
2
1
1
2
Installation plate screw 4 × 25 mm
Remote controller holder
Screw for × 3.5 × 1.6 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
L-Joint pipe
Conduit plate
Air cleaning filter
4
3
SPECIFICATION
Model
MSZ-D30NA
MSY-D30NA
MSZ-D36NA
MSY-D36NA
External finish
White
Power supply
V, phase, Hz
208 / 230 , 1 , 60
Max. fuse size (time delay)/ Disconnect switch
Min. circuit ampacity
Fan motor
A
A
F.L.A
CFM
15
1.0
0.76
HEAT Dry
COOL Dry
445-639-848
—
445-639-848
—
Airflow
Low-Med.-High
CFM
389(350)-639(576)-848(763)
389(350)-639(576)-848(763)
(Wet)
Moisture removal
pt./h
dB(A)
dB(A)
in.
in.
in.
9.9
11.3
32-42-49
34-42-49
11.9
32-42-49
—
Cooling
Heating
32-42-49
34-42-49
32-42-49
—
Sound level
Low-Med.-High
Cond. drain connection O.D.
W
Dimensions
5/8
46-1/16
11-5/8
D
H
in.
14-3/8
Weight
Ib.
40
Remote controller
Control voltage (by built-in transformer)
Wireless type
12-24 VDC
NOTE : Test conditions are based on ARI 210/240.
5
3-1. OPERATING RANGE
(1) POWER SUPPLY
Rated voltage
Guaranteed Voltage
208/230 V
1 phase
60 Hz
Min.187 V 208 V 230 V Max.253 V
Indoor unit
(2) OPERATION
Intake air temperature (°F)
Mode
Condition
Standard temperature
Maximum temperature
Minimum temperature
Maximum humidity
Indoor
78 %
Outdoor
DB
80
90
67
WB
67
73
DB
95
115
14
WB
—
—
Cooling
57
—
—
Standard temperature
Heating Maximum temperature
Minimum temperature
70
80
70
60
67
60
47
75
14
43
65
13
3-2. OUTLET AIR SPEED AND COVERAGE RANGE
Airlow
(CFM)
Air speed
(ft./sec.)
Coverage
range (ft.)
The air coverage range is the figure up
to the position where the air speed is 1
ft./sec., when air is blown out horizon-
tally from the unit properly at the High
speed position.
The coverage range should be used
only as a general guideline since it var-
ies according to the size of the room
and furniture arranged inside the room.
Model
Mode
HEAT
Function
Dry
MSZ-D30NA
MSZ-D36NA
848
848
763
23.6
45.0
45.0
40.7
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
Dry
23.6
21.3
COOL
Wet
6
4
OUTLINES AND DIMENSIONS
Unit : inch
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
Indoor unit
2-11/16
4-11/16
45-1/2
20-7/8
17-11/16
5-3/8
2-3/16
11-5/8
1/4
Wall hole ø3
Air in
46-1/16
Installation plate
Piping
Drain hose
2-15/16
33-11/16
9-1/2
2-5/8
5-7/8
Air out
2-5/16
3/4
Piping
Insulation
ø1-1/4 O.D
ø9/16 I.D
ø3/8 19-11/16
Liquid line
(Flared connection ø3/8)
ø5/8 16-7/8
(Joint connection ø5/8)
ø5/8
ø1-15/16 O.D
ø1-1/4 I.D
ø1-15/16 O.D
ø1-1/4 I.D
Gas line
Joint
Wireless remote controller
(Flared connection ø5/8)
Inslation ø1-1/8 Connected part ø9/16 O.D
Drain hose
Required Space (Indoor Unit)
4-11/16 or more
8-11/16 or more
9-3/8 or more
4-3/16 or more
In case of left,left back,
or left under piping (using spacer) 5-1/8 or more
7
5
WIRING DIAGRAM
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
8
6
REFRIGERANT SYSTEM DIAGRAM
Unit:inch
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
Refrigerant pipe ø5/8
(with heat insulator)
Indoor coil
thermistor
RT12(main)
Indoor
heat
exchanger
Flared connection
Joint
Indoor coil
thermistor
RT13(sub)
Distributor
Joint connection
Room temperature
thermistor
RT11
Flared connection
Strainer
Refrigerant flow in cooling
Refrigerant flow in heating
Refrigerant pipe ø3/8
(with heat insulator)
9
7
SERVICE FUNCTIONS
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
7-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P.C. board.
The time will be shortened as follows. (Refer to 9-7.)
Set time : 1-minute 1-second
Set time : 3-minute 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by short circuit-of JPG and JPS.)
7-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be
modified according to the number of the indoor unit.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below :
NOTE : For modification, take out
the batteries and press
the OPERATE/STOP (ON/
OFF) button twice or 3
times at first.
After finish modification,
put back the batteries then
J1
press the RESET button.
J2
The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.
After modification, press the RESET button.
Table 1
1 unit operation
No modification
2 units operation
Same as at left
3 units operation
Same as at left
Same as at left
Solder J2
4 units operation
Same as at left
Same as at left
No. 1 unit
No. 2 unit
No. 3 unit
No. 4 unit
—
—
—
Solder J1
—
—
Same as at left
Solder both J1 and J2
—
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote
controller for the indoor unit.
The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are
set.
The setting will be cancelled if the breaker has turned off, or the power supply has shut down.
Please conduct the above setting once again after the power has restored.
10
7-3. AUTO RESTART FUNCTION
When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed
are memorized by the indoor electronic control P.C. board. The “AUTO RESTART FUNCTION” sets to work the moment
power has restored after power failure. Then, the unit will restart automatically.
Operation
If the main power has been cut, the operation settings remain.
After the power is restored, the unit restarts automatically according to the memory.
(However, it takes at least 3 minutes for the compressor to start running.)
How to release “AUTO RESTART FUNCTION”
Turn off the main power of the unit.
Solder the Jumper wire JR07 on the indoor electronic control P.C. board. (Refer to 9-7.)
CN152
JR07
BZ
NOTE:
• The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the
remote controller.
• If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is
cancelled.
• If the unit has been off with the remote controller before power failure, the auto restart function does not work as the
power button of the remote controller is off.
• To prevent breaker off due to the rush of starting current, systematize other home appliance not to turn on at the
same time.
• When some air conditioners are connected to the same supply system, if they are operated before power failure, the
starting current of all the compressors may flow simultaneously at restart.
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting
current by adding to the system that allows the units to start one by one.
11
8
MICROPROCESSOR CONTROL
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
WIRELESS REMOTE CONTROLLER
+ These pictures show MSZ type.
Signal transmitting section
Operation display section
OPERATE/STOP
(ON/OFF) button
VANE CONTROL button
(Horizontal vane button)
FAN SPEED
CONTROL button
Temperature buttons
OFF TIMER button
ON TIMER button
OPERATION SELECT button
ECONO COOL button
TIME SET buttons
FORWARD button
BACKWARD button
WIDE VANE button (Vertical vane button)
Indication of
remote controller
model is on back
POWERFUL button
RESET button
CLOCK SET button
NOTE
Use the remote controller
provided with the unit only.
Do not use other remote
controller.
NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the
remote controller with beeps.
INDOOR UNIT DISPLAY SECTION
Operation Indicator lamp
The operation indicator at the right side of the indoor unit indicates the operation state.
•The following indication applies regardless of shape of shape of the indication.
Lighted
Indication
Operation state
Room temperature
Blinking
Not lighted
About 4 °F (2 °C) or
more away from set
temperature
The unit is operating to
reach the set temperature
The room temperature
is approaching the set
temperature
About 2 °F (1 °C) to
4 °F (2 °C) from set
temperature
12
8-1. COOL ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select COOL mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 61 ~ 88 °F (16 ~ 31 °C).
1. Coil frost prevention
When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.
The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor
heat exchanger rises.
2. Low outside temperature operation
When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.
8-2. DRY ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select DRY mode with OPERATION SELECT button.
(3) The set temperature is determined from the initial room temperature.
1. Coil frost prevention
Coil frost prevention is as same as COOL mode. (8-1.1.)
2. Low outside temperature operation
Low outside temperature operation is as same as COOL mode. (8-1.2.)
8-3. HEAT ( ) OPERATION (MSZ)
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select HEAT mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 61 ~ 88 °F (16 ~ 31 °C).
1. Cold air prevention control
When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room tem-
perature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.
2. High pressure protection
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the con-
densing pressure from increasing excessively.
When the temperature of indoor heat exchanger becomes too high, the high pressure protection works.
The indoor fan operates following the cold air prevention control. This mode continues until the temperature of indoor heat
exchanger falls.
3. Defrosting
Defrosting starts when the temperature of outdoor heat exchanger becomes too low.
The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses and the compressor re-starts.
This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.
8-4. FAN(
)OPERATION (MSY)
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone.
(2) Select FAN mode with OPERATION SELECT button.
(3) Select the desired fan speed. When AUTO, it becomes Low.
Only indoor fan operates. Outdoor unit does not operate.
8-5. “I FEEL CONTROL” ( ) OPERATION (MSY)
(1) Press OPERATE/STOP (ON/OFF) button on the remote
Initial room temperature
Mode
controller. OPERATION INDICATOR lamp of the indoor
unit turns on with a beep tone.
(2) Select “I FEEL CONTROL” mode with OPERATION
SELECT button.
(3) The operation mode is determined by the room tempera-
ture at start-up of the operation.
COOL mode of
"I FEEL CONTROL"
77 °F (25 °C) or more
more than 55 °F (13 °C),
less than 77 °F (25 °C) "I FEEL CONTROL"
DRY mode of
•
•
Once the mode is fixed, the mode does not change by room temperature afterwards.
Under the ON TIMER (
operation starts.
) operation, mode is determined according to the room temperature at the set time the
13
(4) The initial set temperature is decided by the initial room temperature.
Model
Initial room temperature
79 °F (26 °C) or more
Initial set temperature
75°F (24 °C)
COOL mode of "I FEEL
CONTROL"
1
77 °F (25 °C) to 79 °F (26 °C) Initial room temperature minus 4 °F (2 °C)
DRY mode of "I FEEL
CONTROL"
more than 55 °F (13 °C),
Initial room temperature minus 4 °F (2 °C)
less than 77 °F (25 °C)
1 When the system is restarted with the remote controller, the system operates with the previous set temperature
regardless of 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 2 ~ 4 °F (1 ~ 2 °C)
··· To lower the set temperature 2 ~ 4 °F (1 ~ 2 °C)
8-6. AUTO CHANGE OVER ··· AUTO MODE OPERATION (MSZ)
Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation.
Mode selection
(1) Initial mode
When unit starts the operation with AUTO operation from off;
• If the room temperature is higher than the set temperature, operation starts in COOL mode.
• If the room temperature is equal to or lower than the set temperature, operation starts in HEAT mode.
(2) Mode change
COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 4 °F (2 °C) below
the set temperature.
HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 4 °F (2 °C) above
the set temperature.
14
8-7. AUTO VANE OPERATION
1. Horizontal vane
(1) Vane motor drive
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approx. 12 V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.
(3) Positioning
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the selected
angle.
(a) The operation starts or finishes (including timer operation).
(b) The test run starts.
(4) VANE AUTO (
) mode
The microprocessor automatically determines the horizontal vane angle and operation to make the optimum room tem-
perature distribution.
COOL and DRY operation
FAN operation (MSY)
HEAT operation (MSZ)
Vane angle is fixed to Angle 4.
Vane angle is fixed to Angle 1.
1
(5) STOP (operation OFF) and ON TIMER standby
In the following cases, the horizontal vane returns to the closed position.
(a) OPERATE/STOP (ON/OFF) button is pressed (POWER OFF).
(b) The operation is stopped by the emergency operation.
(c) ON TIMER is ON standby.
(6) Dew prevention
During COOL or DRY operation with the vane angle at Angle 4 ~ 5 when the compressor cumulative operation time
exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention.
(7) SWING (
) mode
By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically.
(8) Cold air prevention in HEAT operation (MSZ)
The horizontal vane position is set to Upward.
(9) ECONO COOL (
) operation (ECONOmical operation)
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 3.6 °F (2 °C) higher.
Also the horizontal vane swings in various cycle.
SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher, the air
conditioner can keep comfort. As a result, energy can be saved.
ECONO COOL operation is cancelled when ECONO COOL button is pressed once again, when the VANE CONTROL
or POWERFUL button is pressed, or operation mode is changed.
(
10) POWERFUL (
) operation.
The air conditioner automatically adjusts the fan speed and the set temperature, and operates the POWERFUL mode.
The POWERFUL mode is cancelled automatically 15 minutes after operation starts, or when POWERFUL but-
ton is pressed once again within 15 minutes after operation starts. The operation mode returns to the mode prior to
POWERFUL operation. POWERFUL mode also is cancelled, when the ECONO COOL or FAN SPEED SELECT button
is pressed within 15 minutes after operation starts, or operation mode is changed.
15
2. Vertical vane
(1) Vane motor drive
These models are equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the
motor are controlled by pulse signals (approx. 12 V) transmitted from microprocessor.
(2) The vertical vane angle and mode change as follows by pressing WIDE VANE button.
1
4
SWING
5
6
2
3
(3) Positioning
The vane is once pressed to the vane stopper to confirm the standard position and then set to the desired angle.
Confirming of standard position is performed in the following cases.
(a) OPERATE/STOP (ON/OFF) button is pressed (POWER ON/OFF).
(b) SWING is started or finished.
(c) The power supply turns ON.
(4) SWING MODE (
)
By selecting SWING mode with WIDE VANE button, the vertical vane swings horizontally.
The remote controller displays “ ”.
(5) WIDE MODE (
)
By selecting WIDE mode with WIDE VANE button, indoor fan speed becomes faster than setting fan speed on the
remote controller ( ). The remote controller displays “ ”.
NOTE : The position of vane angle 3, angle 4 and angle 5 are different in COOL operation and HEAT operation.
Indoor fan speed becomes faster than setting fan speed on the remote controller even when
ed.
or
is select-
16
8-8. TIMER OPERATION
1. How to set the time
(1) Check that the current time is set correctly.
NOTE : Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display
of TIME MONITOR, so set the current time correctly with CLOCK SET button.
How to set the current time
(a) Press the CLOCK set button.
(b) Press the TIME SET buttons (
• Each time FORWARD button (
) to set the current time.
and
) is pressed, the set time increases by 1 minute, and each time
BACKWARD button (
) is pressed, the set time decreases by 1 minute.
• Pressing those buttons longer, the set time increases / decreases by 10 minutes.
(c) Press the CLOCK set button.
(2) Press OPERATE/STOP (ON/OFF) button to start the air conditioner.
(3) Set the time of timer.
ON timer setting
(a) Press ON TIMER button(
) during operation.
(b) Set the time of the timer using TIME SET buttons (
OFF timer setting
) .
).
and
and
(a) Press OFF TIMER button
during operation.
(
)
(b) Set the time of the timer using TIME SET buttons (
Each time FORWARD button (
) is pressed, the set time decreases by 10 minutes.
2. To release the timer
To release ON timer, press ON TIMER button (
To release OFF timer, press OFF TIMER button (
) is pressed, the set time increases by 10 minutes; each time BACKWARD button (
).
).
TIMER is cancelled and the display of set time disappears.
PROGRAM TIMER
• OFF timer and ON timer can be used in combination. The timer of the set time that is reached first will operate first.
• “ ” and “ ” display shows the order of OFF timer and ON timer operation.
(Example 1) The current time is 8:00 PM.
The unit turns off at 11:00 PM, and on at 6:00 AM.
(Example 2) The current time is 11:00 AM.
The unit turns on at 5:00 PM, and off at 9:00 PM.
PM
PM
PM
AM
NOTE : If the main power is turned OFF or a power failure occurs while ON/OFF timer is active, the timer setting is can-
celled. As these models are equipped with an auto restart function, the air conditioner starts operating with timer
cancelled when power is restored.
17
8-9. EMERGENCY/TEST OPERATION
In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the front of the indoor
unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote
controller run down. The unit will start and OPERATION INDICATOR lamp will light.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The Indoor fan speed runs at
High speed and the system is in continuous operation (with thermostat ON).
After 30 minutes of test run operation the system shifts to EMERGENCY COOL / HEAT MODE with a set temperature of
75 °F (24 °C). The fan speed shifts to Med.
All protective operations such as the coil frost prevention works even in emergency operation.
In the test run or emergency operation, the horizontal vane operates in VANE AUTO (
) mode.
Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any
signal from the remote controller. In case of latter normal operation will start.
NOTE : Do not press EMERGENCY OPERATION switch during normal operation.
HEAT
Operation mode
COOL
(MUZ)
75 °F (24 °C) 75 °F (24 °C)
Set temperature
Fan speed
Med.
Auto
Med.
Auto
Horizontal vane
The operation mode is indicated by the Operation
Indicator lamp as following
Operation Indicator lamp
(MSZ type)
E.O.
SW
EMERGENCY COOL
E.O.
SW
Lighted
Not lighted
↓
EMERGENCY HEAT
STOP
EMERGENCY OPERATION switch
↓
(MSY type)
EMERGENCY COOL
↓
STOP
8-10. 3-MINUTE TIME DELAY OPERATION
When the system turns OFF, compressor will not restart for 3 minutes as 3-minute time delay function operates to protect
compressor from overload.
8-11. CHANGING TEMPERATURE INDICATION (°F /°C)
• The preset unit is °F.
• °F→°C : Press RESET button while the
temperature buttons are pressed.
• °C→°F : Press RESET button or remove
the batteries .
Press RESET button gently using
a thin stick.
18
9
TROUBLESHOOTING
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
9-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn off the unit first with the remote controller, and then after confirm-
ing the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic
control P.C. board.
3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the
components.
4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Lead wiring
Housing point
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing on and off before starting service work.
2) Before servicing check that the connector and terminal are connected properly.
3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the
components for bursting and discoloration.
4) When troubleshooting, refer to 9-2., 9-3. and 9-4.
4. How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, replace the batteries to operate the remote controller normally.
Remove the front lid and insert batteries.
Then reattach the front lid.
Press RESET button with tip end of ball point pen
or the like, and then use the remote controller.
Insert the negative pole of the
batteries first. Check if the polarity
of the batteries is correct.
RESET button
NOTE : 1. If RESET button is not pressed, the remote controller may not operate correctly.
2. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced.
This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the
battery replacement.
19
9-2. FAILURE MODE RECALL FUNCTION
Outline of the function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (9-4.) disappears, the memorized failure details can
be recalled.
This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.
1. Flow chart of failure mode recall function for the indoor/outdoor unit
Operational procedure
The cause of abnormality cannot be found because the abnormality doesn't recur.
Setting up the failure mode recall function
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and TOO COOL button on the
remote controller at the same time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD in operation display section of the
remote controller is displayed after 3 seconds.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is
displayed) with the remote controller headed towards the indoor unit.
1
1. Regardless of normal or abnormal condition, a short
beep is emitted once the signal is received.
Does the left lamp of OPERATION INDICATOR
lamp on the indoor unit blink at the interval of 0.5
seconds?
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnor-
malities that can't be recalled with this way.
Confirm if outdoor unit is abnormal according to the detailed outdoor unit
failure mode recall function.
Blinks: Either indoor or outdoor unit is abnormal.
No
(OFF)
Beep is emitted at the same timing as the
blinking of the left lamp of OPERATION
INDICATOR lamp.
Yes
(Blinks)
2
Judgment of indoor/outdoor abnormality
Before blinking, does the left lamp of OP-
ERATION INDICATOR lamp stay ON for 3
seconds?
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
No
Yes
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the
outdoor unit failure mode table. (Refer to outdoor unit service manual.)
The indoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the indoor unit
failure mode table. (Refer to 9-2.2)
Make sure to check at least two consecutive blinking cycles.
Make sure to check at least two consecutive blinking cycles.
3
2
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
•Turn OFF the power supply and turn it ON again.
•Press RESET button of the remote controller.
Repair the defective parts.
Deleting the memorized abnormal condition
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall
function" mentioned above.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
NOTE: 1. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
2. Blinking pattern when the indoor unit is abnormal:
Blinking at 0.5-
second interval
Blinking at 0.5-
second interval
2.5-second OFF
2.5-second OFF
ON
OFF
Beeps
Beeps
Beeps
Repeated cycle
Repeated cycle
Repeated cycle
3.Blinking pattern when the outdoor unit is abnormal:
Blinking at 0.5-
Blinking at 0.5-
second interval
2.5-second OFF
3-second ON
second interval
2.5-second OFF
3-second ON
ON
OFF
No beep
Beeps
No beep
Beeps
Repeated cycle
Repeated cycle
Repeated cycle
20
2. Indoor unit failure mode table
Left lamp of OP-
Abnormal point
ERATION INDICA-
(Failure mode)
TOR lamp
Condition
—
Correspondence
—
Not lighted
Normal
The room temperature thermistor short or open
circuit is detected every 8 seconds during op-
eration.
1-time flash every Room temperature
Refer to the characteristics of the room temperature
thermistor (9-7.).
0.5-second
thermistor
2-time flash
Indoor coil thermis- The indoor coil thermistor short or open circuit Refer to the characteristics of the main indoor coil
2.5-second OFF
tor
is detected every 8 seconds during operation.
thermistor, the sub indoor coil thermistor (9-7.).
3-time flash
2.5-second OFF
The serial signal from outdoor unit is not re-
ceived for a maximum of 6 minutes.
Refer to 9-6. "How to check miswiring and serial
signal error".
Serial signal
The rotational frequency feedback signal is
not emit during the 12 seconds the indoor fan
operation.
11-time flash
2.5-second OFF
Indoor fan motor
Refer to 9-6. "Check of indoor fan motor".
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
12-time flash
2.5-second OFF
Indoor control
system
Replace the indoor electronic control P.C. board.
NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (9-4.).
21
9-3. INSTRUCTION OF TROUBLESHOOTING
Start
Indoor unit operates.
Indoor unit oper-
Indoor unit
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
Outdoor unit doesn't
ates.
doesn't receive
the signal from
remote controller.
operate normally.
Outdoor unit
doesn't operate.
If blinking of OPERATION INDI-
Indoor unit
Indoor unit
Outdoor unit
operates only
in Test Run
operation.
Outdoor
Unit doesn't
operate normal
operation in
COOL or HEAT
mode.
CATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
operates, when
EMERGENCY
OPERATION
doesn't operate,
when EMERGEN-
CY OPERATION
switch is pressed.
unit doesn't
operate even
in Test Run
operation.
switch is pressed.
"Test Run operation" means the
operation within 30 minutes after
EMERGENCY OPERATION
switch is pressed.
1.Check indoor / out-
door connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2.Refer to 9-6. "Check
of indoor electronic
control P.C. board and
indoor fan motor".
Check room
temperature
thermistor.
Refer to 8-7.
"Test point
diagram and
voltage".
Refer to
Refer to 9-6.
Refer to "How
to check
inverter/
"Check of R.V. "Check of remote
coil".
controller and
receiver P.C.
board".
Refer to outdoor unit service manual.
compressor".
Left lamp
7-time flash 14-time flash
Cause: Cause:
Outdoor unit Outdoor unit
• Trouble of • Other ab-
outdoor con- normality
trol system
Left lamp
Left lamp
Left lamp
Left lamp
Left lamp
Left lamp
Left lamp
6-time flash
Cause:
Flash on and
2-time flash
3-time flash 4-time flash 5-time flash
off at 0.5-sec- Cause:
Cause:
Cause:
Cause:
Outdoor unit
• Trouble of
thermistor in
outdoor unit
ond intervals
Cause:
Indoor unit
Indoor unit Indoor unit
• Trouble of • Trouble
Outdoor unit
• Outdoor
power
• Trouble of
room tem-
perature /
indoor coil
thermistor
Indoor/ Out-
door unit
indoor fan
motor
of indoor
unit control
system
system
abnormality
• Miswiring or
trouble of
serial signal
Refer to 9-6. Check room Refer to 9-6. Replace the Refer to "How Refer to
Replace the Check "Flow
inverter P.C. chart of the
board or the detailed
"How to
temperature
"Check of indoor elec-
to check
"Check of
check miswir- thermistor
ing and serial and indoor
signal error". coil thermis-
tor.Refer to
indoor fan
motor".
tronic control inverter/ com- outdoor
P.C. board.
pressor".
thermistors". outdoor elec- outdoor unit
tronic control failure mode
P.C. board.
recall func-
tion."
9-7."Test
point diagram
and voltage".
22
9-4. TROUBLESHOOTING CHECK TABLE
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
When the indoor unit has started operation and the following detection method has detected an abnormality (the first detection
after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR
lamp flashing.
Lighted
OPERATION INDICATOR
Blinking
Not lighted
Abnormal
No.
1
Operation indicator lamp
Left lamp flashes.
Symptom
Condition
Correspondence
point
Indoor unit
0.5-second ON
Miswiring or
serial signal
and outdoor The serial signal from the outdoor unit is not
• Refer to 9-6. "How to check miswiring
and serial signal error".
unit do not
operate.
received for a maximum of 6 minutes.
0.5-second OFF
Left lamp flashes.
Indoor coil
thermistor
2-time flash
Indoor unit
• Refer to 9-7.the characteristics of indoor
coil thermistor, and the room tempera-
ture thermistor.
and outdoor The indoor coil or the room temperature
2
unit do not
operate.
thermistor is short or open circuit.
2.5-second OFF
Room
temperature
thermistor
Left lamp flashes.
Indoor unit
3-time flash
Indoor fan
motor
and outdoor The rotational frequency feedback signal is not • Refer to 9-6. "Check of indoor fan mo-
3
4
unit do not
operate.
emitted during the indoor fan operation.
tor".
2.5-second OFF
Left lamp flashes.
4-time flash
Indoor unit
and outdoor
unit do not
operate.
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
Indoor con-
trol system
• Replace the indoor electronic control
P.C. board.
2.5-second OFF
Left lamp flashes.
Indoor unit
It consecutively occurs 3 times that the
• Refer to "How to check of inverter/
5-time flash
Outdoor
power sys-
tem
and outdoor compressor stops for overcurrent protection or compressor".
5
unit do not
operate.
start-up failure protection within 1 minute after Refer to outdoor unit service manual.
start-up. • Check the stop valve.
2.5-second OFF
Left lamp flashes.
6-time flash
Indoor unit
Outdoor
and outdoor The outdoor thermistors short or open circuit • Refer to "Check of outdoor thermistor".
6
7
thermistors
unit do not
operate.
during the compressor operation.
Refer to outdoor unit service manual.
2.5-second OFF
Left lamp flashes.
7-time flash
Indoor unit
and outdoor
unit do not
operate.
It cannot properly read data in the nonvola-
tile memory of the inverter P.C. board or the
outdoor electronic control P.C. board.
• Replace the inverter P.C. board or the
outdoor electronic control P.C. board.
Refer to outdoor unit service manual.
Outdoor con-
trol system
2.5-second OFF
Left lamp flashes.
14-time flash
Indoor unit
• Confirm the abnormality in detail using
the failure mode recall function for
outdoor unit.
Other abnor-
mality
and outdoor An abnormality other than above mentioned is
8
unit do not
operate.
detected.
2.5-second OFF
23
9-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
Part name
Check method and criterion
Figure
Room temperature
thermistor(RT11)
Measure the resistance with a tester.
Refer to 9-7. "Test point diagram and voltage", "Indoor electronic control P.C.
board", the chart of thermistor.
Indoor coil thermistor
(RT12(MAIN), RT13(SUB))
Indoor fan motor(MF)
Check 9-6.
.
Measure the resistance between the terminals with a tester.
(Part temperature 50 ~ 86 °F)
Horizontal vane motor (MV1)
RED
Horizontal vane motor
(MV1)
Vertical vane motor
(MV2)
ROTOR
Color of the lead wire
BRN - other one
Normal
YLW
BRN
240 ~ 260 Ω
Vertical vane motor (MV2)
GRN
ORN
Color of the lead wire
BRN - other one
Normal
282 ~ 306 Ω
24
9-6. TROUBLESHOOTING FLOW
OPERATION INDICATOR lamp flashes 3-time.
Indoor fan does not operate.
A Check of indoor fan motor
The indoor fan motor error has occurred, and the indoor fan doesn't operate.
Turn OFF the power supply.
Pay careful attention to the high voltage on the fan motor connector CN211.
Turn ON the power supply, wait 5 seconds or more, and then press
EMERGENCY OPERATION switch.
Measure the supply voltage as follows within 12 seconds after EMER-
GENCY OPERATION switch is pressed.
If more than 12 seconds passes by, turn OFF the power supply and
turn ON it again, then measure the voltage.
Is there any foreign matter that
interferes the rotation of the line
flow fan?
No
1.Measure the voltage between CN211 (+) and (-).
2.Measure the voltage between CN211 (+) and (-).
Yes
If more than 12 seconds or more passes after EMERGENCY OPERATION
switch is pressed, the voltage mentioned above 2 goes 0 VDC although
the indoor electronic control P.C. board is normal
Remove the foreign matter and
adjust the line flow fan.
Is there 294/325 VDC between
CN211
CN211 (+) and (-), and does the
voltage between CN211 (+) and
(-) rise to the range of 3 to 6 VDC
within 12 seconds after EMERGEN-
CY OPERATION switch is pressed?
Indoor electronic
control P.C. board
Replace the indoor fan motor.
Yes
No
Replace the indoor electronic control P.C. board.
The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops.
Measure the voltage between CN211
Is it unchanged holding
(+) and (-) while the fan motor is
rotating.
Replace the indoor electronic control P.C. board.
0 or 15 VDC?
No
(Changed)
Yes
(Unchanged)
Replace the indoor fan motor.
25
Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not operate with the remote controller.
B Check of remote controller and receiver P.C. board
Check if the remote controller is exclusive for this air conditioner.
Switch ON the remote controller.
Is LCD display on the remote controller
Replace the batteries. (Refer to 9-1.4.)
visible?
No
(not clear)
Yes
Remove the batteries, then set them back
and press RESET button. (Refer to 9-1.4.)
Check if the unit operates with the remote
controller.
Does the unit operate with the remote
controller?
Turn ON a radio to AM and press switch
ON the remote controller.
No
Yes
OK
Is noise heard from radio?
Yes
Replace the remote controller.
No
Are there any fluorescent lights of
inverter or rapid-start type within the
range of 3.28 ft.?
•Reinstall the unit away from lights.
•Attach a filter on receiving part.
Yes
No
Measure the voltage between receiver P.C. board
connector CN301 No.2(+) and No.3(-) when the
remote controller button is pressed.
Replace the remote controller.
Is the voltage approx. 4VDC?
No (5 or 0 VDC)
Yes
Replace the receiver P.C. board.
26
The unit does not operate with the remote controller.
Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch.
C Check of indoor electronic control P.C. board and indoor fan motor
Turn OFF the power supply.
Remove indoor fan motor connector CN211
and vane motor connector CN151 from the
indoor electronic control P.C. board and turn
ON the power supply.
Measure the resistance between
CN211 and of the indoor fan motor
connector.
Short/open circuit:
Replace the indoor fan motor.
Does the unit operate with the remote
controller?
Does OPERATION INDICATOR lamp light
up by pressing EMERGENCY OPERATION
switch?
Measure the resistance of the horizon-
tal vane motor coil.
Refer to 9-5.
Short/open circuit:
Replace the horizontal vane motor and the
indoor electronic control P.C. board.
Yes
No
Replace the indoor elec-
tronic control P.C. board.
Yes
Are the varistor(NR11)
burnt and the fuse(F11)
blown?
No
Turn OFF the power supply.
Check both “parts side” and “pattern
side” of the indoor electronic control
P.C. board visually.
Be sure to check both the fuse
and the varistor in any case.
Is the fuse(F11) blown
only?
No
Yes
1.The fan motor connector's lead wire is red, whereas is
black.
2.Connect "+" of the tester to fan motor connector's lead
wire, and "-" to lead wire, otherwise the resistance cannot
be measured properly.
Measure the resistance between
(+) and (-) of the indoor fan motor
connector (to CN211 on the indoor
electronic control P.C. board) . 1,
2
Replace the indoor electronic control
P.C. board and the indoor fan motor.
Is the resistance 1 MΩ
or more?
No
Yes
Replace the indoor electronic
control P.C. board
Measure the resistance of cement
resistor(R111) on the indoor elec-
tronic control P.C. board.
Is the resistance approx.
4 Ω?
Replace the indoor electronic control P.C.
board and the indoor fan motor.
No
Yes
Replace the indoor electronic control P.C. board.
Indoor electronic
control P.C. board
Varistor(NR11)
Fuse(F11)
CN211
27
• Unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION switch.
Indoor unit does not operate.
• OPERATION INDICATOR lamp flashes ON and OFF every 0.5-second.
Outdoor unit does not operate.
D How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage AC in
Check the power supply.
the power supply?
No
Yes
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
Check the wiring.
No
Yes
Press EMERGENCY OPERATION switch once.
Does the left lamp of OPERATION INDICATOR
lamp light up? <Confirmation of the power to
the indoor unit>
No
No
Yes
Is there any miswiring, poor
contact, or wire disconnec-
tion of the indoor/outdoor
connecting wire?
Is serial signal error indicated 6 minutes later?
Yes
Correct them.
Yes
Is fuse (F65) broken?
No
A
Turn OFF the power supply.
Check once more if the indoor/outdoor
connecting wire is not miswiring.
B
1. Miswiring may damage indoor electronic control
P.C. board during the operation.
Be sure to confirm the wiring is correct before
the operation starts.
Short-circuit outdoor terminal block S2
and S3.
1
Turn ON the power supply.
Does the LED on the inverter P.C. board or
the outdoor electronic control P.C. board
repeat "3.6-second-OFF and 0.8-second-
ON quick blinking"?
Replace the inverter P.C. board or the
outdoor electronic control P.C. board.
2
No
(Lighted
or not
2. Be careful to the residual
voltage of smoothing capacitor.
Yes
lighted)
Turn OFF the power supply.
Remove the short-circuit between out-
door terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20 VDC
between outdoor terminal block S2 and
S3? <Confirmation of serial signal>
Yes
Is there any error of the in-
door/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Replace the indoor/out-
door connecting wire.
A
No
Yes
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
No
• Press EMERGENCY OPERATION
switch.
Is there any error of the in-
door/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
No
Is there rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
Replace the indoor/out-
Yes door connecting wire.
• Reinstall
No
either the unit
or the light
each other
Yes
away.
Is serial signal
error indicated 6
minutes later?
• Attach a filter
on remote
control receiv-
ing section
of the indoor
unit.
No
Replace the indoor electronic control P.C. board.
Yes
Be sure to release the failure-mode recall function
after checking.
B
28
E Electromagnetic noise enters into TV sets or radios
Is the unit grounded?
Yes
Ground the unit.
No
Is the distance between the antennas
and the indoor unit within 9.91 ft., or is
the distance between the antennas and
the outdoor unit within 9.91 ft.?
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Yes
No
Is the distance between the TV sets or
radios and the indoor unit within 3.28
ft., or is the distance between the TV
sets or radios and the outdoor unit
within 9.91 ft.?
Extend the distance between the TV sets and/or
radios and the indoor unit, or the TV sets or
radios and the outdoor unit.
Yes
No
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the anten-
na wiring?
Replace or repair the antenna.
Replace or repair the coaxial cable.
Yes
Yes
No
Is the indoor/outdoor connecting wire of
the air conditioner and the wiring of the
antennas close?
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wir-
ing of the antennas.
No
Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength
or the installation condition (combination of specific conditions such as antennas or wiring).
Check the followings before asking for service.
1. Devices affected by the electromagnetic noise
TV sets, radios (FM/AM broadcast, shortwave)
2. Channel, frequency, broadcast station affected by the electromagnetic noise
3. Channel, frequency, broadcast station unaffected by the electromagnetic noise
4. Layout of ;
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver
5. Electric field intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifier such as booster
7. Operation condition of air conditioner when the electromagnetic noise enters in
1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic
noise.
2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller
for power ON, and check for the electromagnetic noise.
3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the
electromagnetic noise.
4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the
indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.
29
9-7. TEST POINT DIAGRAM AND VOLTAGE
MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA
Indoor electronic control P.C. board
Power supply input
208 / 230 VAC
Cement resistor (R111)
Varistor (NR11)
Fuse (F11)
250 V 3.15 A
Indoor fan motor
(CN211)
Release of Auto restart function
Solder the Jumper wire JR07
(Refer to 7-3.)
294 / 325 VDC
(-) Fiducial terminal of
cathode side on measur-
ing high-voltage DC
15 VDC
(+)3-6 VDC
(+)0 VDC or 15 VDC
5 VDC
Power monitor
receiver P.C. board
Indoor coil thermis-
tor RT12(MAIN)
RT13(SUB)
(CN112)
Horizontal vane
motor(CN151)
Room temperature
thermistor(RT11)
(CN111)
Timer short
mode point
}
JPG, JPS
(Refer to 7-1.)
Vertical vane motor (CN152)
12 VDC
Indoor coil thermistor [RT12 (MAIN), RT13 (SUB)]
Room temperature thermistor (RT11)
40
SW P.C. board
30
20
10
0
32 50 68 86 104 122 140
Temperature (°F)
30
10
DISASSEMBLY INSTRUCTIONS
<"Terminal with locking mechanism" Detaching points>
The terminal which has the locking mechanism can be detached as shown below.
There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.
(1) Slide the sleeve and check if there is a locking lever or not.
(2) The terminal with this connector has the
locking mechanism.
Sleeve
ꢀSlide the sleeve.
ꢀHold the sleeve, and
ꢁPull the terminal while
pushing the locking
pull out the terminal
slowly.
Locking lever
lever.
Connector
10-1. MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA
OPERATING PROCEDURE
PHOTOS
1. Removing the panel
Photo 1
Front panel
(1) Press and unlock the knobs on both sides of the front
panel and lift the front panel until it is level, and then pull
the hinges forward to remove the front panel.
(2) Remove the screw caps of the panel.
Remove the screws of the panel.
(3) Hold the lower part of both ends on the panel and pull it
slightly toward you, and then remove the panel by pushing
it upward.
(4) Remove the screw of the corner box. Remove the corner
box.
Screw of the
corner box
Screws
Photo 2
2. Removing the electrical box, the electronic control P.C.
board, the power monitor receiver P.C. board and the SW
P.C. board
Ground wire to indoor
heat exchanger
Water cut
Screw of
electrical side
cover
(1) Remove the panel and corner box. (Refer to 1.)
(2) Remove the screw of the electrical cover. Remove the elec-
trical cover.
(3) Remove the screw of the V.A. clamp.
(4) Remove the V.A. clamp, then remove the indoor/outdoor
connecting wire.
Screw of elec-
trical cover
Screw of V.A.
clamp
(5) Disconnect TAB of the ground wire connected to the indoor
heat exchanger.
(6) Remove the screw of the electrical side cover. Remove the
electrical side cover.
SW holder
(7) Disconnect all the connectors, TAB and TAB4 on the indoor
electronic control P.C. board.
(8) Remove the screw on lower side of the electrical box. (See
photo 3) Remove the electrical box.
(9) Remove the indoor electronic control P.C. board.
(
(
(
10
) Remove the SW holder from the electrical box.
Power monitor
receiver holder
11
) Open the SW holder and pull out the SW P.C. board.
12
) Remove the power monitor receiver holder from the electri-
cal box.
(
13
) Open the power monitor receiver holder and pull out the
power monitor receiver P.C. board.
31
OPERATING PROCEDURE
PHOTOS
Photo 3
3. Removing the nozzle assembly
(1) Remove the panel and the corner box. (Refer to 1.)
(2) Remove the electrical cover. (Refer to 2.)
(3) Remove the electrical side cover, disconnect the vane
motor connector.
(4) Pull out the drain hose from the nozzle assembly, and
remove the nozzle assembly.
Screw of electrical
box
4. Removing the vertical vane motor
(1) Remove the nozzle assembly. (Refer to 3.)
(2) Remove the crank of the vertical vane motor unit from the
vertical vane.
Photo 4
Screws of the vertical
vane motor unit
(3) Remove the screw of the vertical vane motor unit, and pull
the vertical vane motor unit.
(4) Remove the screws of the vertical vane motor unit cover.
(5) Remove the crank of the vertical vane motor unit from the
shaft of the vertical vane motor.
Crank of the vertical
vane motor unit
(6) Remove the vertical vane motor from the vertical vane
motor unit.
(7) Disconnect the connector of vertical vane motor from the
vertical vane motor.
Screws of the vertical vane motor unit cover
Photo 5
Crank of the vertical
vane motor unit
5. Removing the horizontal vane motor
(1) Remove the nozzle assembly. (Refer to 3.)
(2) Remove the screws of the horizontal vane motor unit, and
pull out the horizontal vane motor unit.
(3) Disconnect the connector from the horizontal vane motor.
(4) Remove the screws of the horizontal vane motor.
(5) Remove the horizontal vane motor.
Screws of the vertical
vane motor unit
Screws of the vertical vane motor unit cover
Photo 6
Screws of the
horizontal vane
motor
Screws of the horizontal vane motor unit
32
OPERATING PROCEDURE
PHOTOS
Photo 7
6. Removing the line flow fan and the indoor fan motor
(1) Remove the panel and the corner box. (Refer to 1.)
(2) Remove the electrical box. (Refer to 2.)
(3) Remove the nozzle assembly. (Refer to 3.)
(4) Remove the water cover.
Screw of the motor band
(5) Loosen the screw of the line flow fan.
(6) Remove the screws of the motor bed.
(7) Remove the lead wire of the indoor coil thermistor from the
hooks of the motor bed.
(8) Remove the motor band and the motor bed together with
indoor fan motor. (Be careful not to drop the indoor fan
motor because it is heavy.)
Screws of the motor bed
(9) Remove the screw of the motor band, and remove the
motor band then pull out the indoor fan motor.
(10) Remove the screws of the left side of the heat exchanger.
(11) Lift the left side of the heat exchanger.
Lead wire of the indoor
coil thermistor
(12) Remove the line flow fan to the lower-left.
Photo 8
Photo 9
Screws of the left
side of the heat
exchanger
Screw of the line
flow fan
33
34
35
TM
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
Copyright 2008 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Feb. 2008. No. OBH501 7
Made in Japan
New publication, effective Feb. 2008
Specifications subject to change without notice.
|