Vermont Casting Cfm Specialty Air Conditioner Msy D36na User Manual

INDOOR UNIT  
No. OBH501  
SERVICE MANUAL  
Wireless type  
Models  
MSZ-D30NA  
MSZ-D36NA  
MSY-D30NA  
MSY-D36NA  
Outdoor unit service manual  
MUZ-DNA Series (OBH502)  
MUY-DNA 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 lter  
(Anti-Allergy Enzyme Filter)  
Front panel  
Air lter  
(Catechin air lter)  
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 lter  
4
3
SPECIFICATION  
Model  
MSZ-D30NA  
MSY-D30NA  
MSZ-D36NA  
MSY-D36NA  
External nish  
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  
Airow  
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 modication  
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.  
Conrm 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 conrm 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 conrm 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 ash every Room temperature  
Refer to the characteristics of the room temperature  
thermistor (9-7.).  
0.5-second  
thermistor  
2-time ash  
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 ash  
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 ash  
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 ash  
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  
ashing 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 ash 14-time ash  
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 ash  
Cause:  
Flash on and  
2-time ash  
3-time ash 4-time ash 5-time ash  
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 ashes.  
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 ashes.  
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 ashes.  
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 ashes.  
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 ashes.  
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 ashes.  
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 ashes.  
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 ashes.  
14-time flash  
Indoor unit  
• Conrm 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  
ow 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 ow 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 uorescent lights of  
inverter or rapid-start type within the  
range of 3.28 ft.?  
•Reinstall the unit away from lights.  
•Attach a lter 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? <Conrmation 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 conrm 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? <Conrmation 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?  
<Conrmation 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 lter  
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 fullled, the electromagnetic noise may enter, depending on the electric eld strength  
or the installation condition (combination of specic 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 eld intensity of the broadcast station affected by the electromagnetic noise  
6. Presence or absence of amplier 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.  

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