Mitsubishi Electric MSZ-GC50NA Service manual

Revision A:
• MSZ-GC35NA -
C2
has been added.
Please void OBH481.
SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
No. OBH481
SERVICE MANUAL
REVISED EDITION-A
Models
MSZ-GC22NA MSZ-GC25NA MSZ-GC35NA MSZ-GC35NA MSZ-GC50NA MSZ-GC60NA MSZ-GC71NA -
C1
C1
C1
C2
C1
C1
Outdoor unit service manual
MUZ-GC·NA Series(OBH482)
MXZ-A·NA Series (OB430)
C1
CONTENTS
1. PART NAMES AND FUNCTIONS ····················· 3
2. SPECIFICATION ················································ 4
3. OUTLINES AND DIMENSIONS ························ 5
4. WIRING DIAGRAM············································ 7
5. REFRIGERANT SYSTEM DIAGRAM ··············· 9
6. SERVICE FUNCTIONS ··································· 10
7. MICROPROCESSOR CONTROL ··················· 12
8. TROUBLESHOOTING····································· 18
9. DISASSEMBLY INSTRUCTIONS···················· 39
MSZ-GC22/25/35NA
PARTS CATALOG (OBB481)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Revision A:
• MSZ-GC35NA -
C2
MSZ-GC35NA -
has been added.
C1
→ MSZ-GC35NA -
C2
• FAN MOTOR has been changed. (AC → DC)
2
1
PART NAMES AND FUNCTIONS
MSZ-GC22NA
MSZ-GC25NA
MSZ-GC35NA
MSZ-GC50NA
Air cleaning filter
(Anti-allergy enzyme filter, option)
Air inlet
Catechin air filter
Front panel
MSZ-GC60NA
MSZ-GC71NA
Line flow fan
Air outlet
Remote controller
Vertical vane
Horizontal vane
MSZ-GC22NA
MSZ-GC25NA
MSZ-GC35NA
Remote control
receiving section
Emergency operation switch (E.O. SW)
Operation Indicator
lamp
MSZ-GC50NA
Operation Indicator
lamp
Remote control
receiving section
Emergency operation switch
MSZ-GC60NA
MSZ-GC71NA
Operation indicator lamp
Emergency operation switch
Remote control
receiving section
ACCESSORIES
Installation plate
Installation plate fixing screw 4 × 25 mm
Remote controller holder
Fixing 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)
3
MSZ-GC22/25/35/50
MSZ-GC60/71
1
5
1
2
2
1
1
1
7
1
2
2
1
1
2
SPECIFICATION
Indoor model
Function
Power supply
Electrical Running current 1
data
Power input 1
MSZ-GC22NA
Cooling
Heating
A
W
Model
MSZ-GC25NA
Cooling
Heating
Single phase 220 - 230 V, 60 Hz
0.24
45
C1
RC4V18-BA
C2
Fan motor
Special remarks
Current 1
A
Special remarks
Indoor model
Function
Power supply
Electrical Running current 1 A
data
Power input 1
W
Model
Fan motor
Current 1
A
Dimensions W × H × D
mm
Weight
kg
Air flow (Super High)
m3/h
Air flow (High/Med./Low)
Air direction
Sound level (Super High)
Sound level (High/Med./ dB(A)
Low)
Fan speed (Super High)
rpm
Fan speed (High/Med./
Low)
Fan speed regulator
Remote controller model
C1
0.24
Dimensions W × H × D
mm
Weight
kg
576
Air flow (Super High)
m3/h
Air flow (High/Med./Low)
462/354/246
Air direction
Sound level (Super High)
Sound level (High/Med./ dB(A)
Low)
Fan speed (Super High) rpm
1,070
Fan speed (High/Med./
rpm 890/720/550
Low)
Fan speed regulator
Remote controller model
600
480/378/276
MSZ-GC35NA
Cooling
Heating
C2
788 × 295 × 234
9
576
600
462/354/246 480/378/276
4
43
RC4V18-BA
RC0J40-EF
0.24
0.27
534
444/330/234
36/29/21
570
462/354/246
36/29/22
1,100
1,070
1,100
1,080
1,140
920/760/600
890/720/550
920/760/600
930/740/580
960/780/600
4
KM05B
MSZ-GC50NA
Cooling
Heating
0.35
40
RC0J30-CC
0.35
780 × 298 × 210
9
654
594/445/414
4
48
44/38/32
MSZ-GC60NA
MSZ-GC71NA
Cooling
Heating
Cooling
Heating
Single phase 220 - 230 V, 60 Hz
0.6
60
RC0J56-AA
0.6
1,100 × 325 × 258
16
–
1,032/768/522 1,032/786/522 1,032/798/564 1,032/816/564
5
–
54/40/32
54/40/33
1300
–
1,200/1,100/900
1,310/1,030/750 1,310/1,050/750 1,310/1,080/800 1,310/1,080/800
4
KM05B
3
KM05C
NOTE : Test conditions are based on CNS 14464, ISO 5151.
Cooling : Indoor Dry-bulb temperature 27°C
Outdoor Dry-bulb temperature 35°C
Heating : Indoor Dry-bulb temperature 20°C
Outdoor Dry-bulb temperature 7°C
1 Measured under rated operating frequency.
Wet-bulb temperature
19°C
Wet-bulb temperature
6°C
4
Specifications and rating conditions of main electric parts
Model
Item
Fuse
Horizontal vane
motor
Vane motor
Varistor
Terminal block
3
MSZ-GC22/25/35
MSZ-GC50
(F11)
(MV)
MSZ-GC60/71
T3.15AL 250 V
MSBPC20M16
12 VDC 250 Ω (at 25˚C)
—
ERZV14D471
12 VDC
(MV1/MV2)
—
(NR11) S10K320E3K1 (ERZV14D471)
(TB)
3P
—
MP20/MP20
4P
OUTLINES AND DIMENSIONS
MSZ-GC22NA MSZ-GC25NA MSZ-GC35NA
Unit : mm
11 × 26 Oblong hole
11 × 20 Oblong hole
225
225
59
18.5
59
Installation plate
235
253.5
214
155
59
155
335
Indoor unit
320
74
Air in
2
41.5
40.5
254.5
215
788
Wall hole ø65
234
5
Installation plate
8
295
Piping
Drain hose
100
53
607
128
119
Air out
19
Insulation
Liquid line
Gas line
Drain hose
Piping
159
58
137
5
ø35 O.D
ø6.35 - 0.5 m (Flared connection ø6.35)
ø9.52 - 0.43 m (Flared connection ø9.52)
Insulation ø28 O.D Connected part ø16 O.D
MSZ-GC50NA
Unit : mm
11×26 Oblong hole
225
225
55
155
335
Air in
Indoor unit
Wall hole ø65
5
Installation plate
102
Liquid line ø6.35-0.5 m
Gas line ø9.52-0.43 m
Insulation ø35 O.D
ø19 I.D
Drain hose ø16
(Connected part O.D)
90
Insulation ø28
106
19
Air out
159
58
{
100
298
7 or more
210
624.5
70
320
3
155
42.5
215
41.5
780
53.5
55
214
234
273.5
287.5
55
Installation plate
14
11×20 Oblong hole
MSZ-GC60NA MSZ-GC71NA
Unit : mm
Installation plate
Indoor unit
7.5
173
98
414.5
414.5
173
47
2.5
47
255.5
1068
315
98
Wall hole ø75
258
1100
Air in
5
Installation plate
{
325
{
791
56
Air out
19
Drain hose ø16
(Connected part O.D)
Insulation ø28
159
58
253
Liquid line ø6.35-0.5 m
Gas line ø12-0.43 m
Insulation ø50 O.D
ø32 I.D
for MSZ-GC60
Liquid line ø9.52-0.5 m
Gas line ø12-0.43 m
Insulation ø50 O.D
ø32 I.D
for MSZ-GC71
6
4
WIRING DIAGRAM
MSZ-GC22NA MSZ-GC25NA MSZ-GC35NA -
MSZ-GC35NA -
C2
7
C1
MSZ-GC50NA
MSZ-GC60NA MSZ-GC71NA
8
5
REFRIGERANT SYSTEM DIAGRAM
MSZ-GC22NA MSZ-GC25NA
MSZ-GC35NA
MSZ-GC50NA
Unit:mm
Refrigerant pipe ø12.7
(with heat insulator)
Refrigerant pipe ø9.52
(with heat insulator)
Indoor coil
thermistor
RT12(main)
Indoor
heat
exchanger
Indoor
heat
exchanger
Flared connection
Indoor coil
thermistor
RT13(sub)
Indoor coil
thermistor
RT12(main)
Distributor
Flared connection
Indoor coil
thermistor
RT13(sub)
Room temperature
thermistor
RT11
Room temperature
thermistor
RT11
Flared connection
Flared connection
Refrigerant pipe ø6.35
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
MSZ-GC60NA
MSZ-GC71NA
Refrigerant pipe ø15.88
(with heat insulator)
Indoor
heat
exchanger
Refrigerant pipe ø15.88
(with heat insulator)
Indoor coil
thermistor
RT12(main)
Distributor
Indoor
heat
exchanger
Flared connection
Indoor coil
thermistor
RT12(main)
Flared connection
Indoor coil
thermistor
RT13(sub)
Indoor coil
thermistor
RT13(sub)
Room temperature
thermistor
RT11
Room temperature
thermistor
RT11
Strainer
#50
Flared connection
Flared connection
Refrigerant pipe ø9.52
(with heat insulator)
Refrigerant pipe ø6.35
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
9
6
SERVICE FUNCTIONS
MSZ-GC22NA MSZ-GC25NA MSZ-GC35NA MSZ-GC50NA MSZ-GC60NA MSZ-GC71NA
6-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS on the indoor electronic control P.C. board.
The time will be shortened as follows. (Refer to 8-7.)
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.)
6-2. 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
press the RESET button.
J1
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
2 units operation
3 units operation
4 units operation
No. 1 unit
No modification
Same as at left
Same as at left
Same as at left
No. 2 unit
–
Solder J1
Same as at left
Same as at left
No. 3 unit
–
–
Solder J2
Same as at left
No. 4 unit
–
–
–
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 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
6-3. 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 8-7.)
MSZ-GC60/71
JR07
BZ
JR07
BZ
CN112
CN152
CN101
CN151
JR07
CN151
CN112
CN10A
CN151
CN1R1 CN211
CN211
MSZ-GC50
CN112 CN111
MSZ-GC22/25/35
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
7
MICROPROCESSOR CONTROL
MSZ-GC22NA MSZ-GC25NA MSZ-GC35NA MSZ-GC50NA MSZ-GC60NA MSZ-GC71NA
WIRELESS REMOTE CONTROLLER
These pictures show MSZ-GC60/71
Signal transmitting section
Operation display section
VANE CONTROL button
(Horizontal vane button)
FAN SPEED CONTROL button
OPERATE /STOP
(ON /OFF)button
ON/OFF
TOO
WARM
TOO
COOL
OPERATION SELECT button
OFF TIMER button
ECONO COOL button
ON TIMER button
TEMPERATURE buttons
Open the front lid.
LONG button
(MSZ-GC60/71)
LONG
TIME SET buttons
FORWARD button
BACKWARD button
CLOCK SET button
WIDE VANE button
(Vertical vane button)
(MSZ-GC60/71)
RESET button
Indication of remote controller
model is on back.
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 the indicator.
Indication
Operation state
Room temperature
Lighted
Blinking
or
The unit is operating to
reach the set temperature
About 2°C or more away
from set temperature
or
The room temperature is
approaching the set temperature
About 1 to 2°C from set
temperature
or
Standby mode
(Only during multi system
operation)
-
12
Not lighted
7-1. COOL ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns ON.
(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 16 ~ 31°C.
1. Coil frost prevention
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil
from frosting.
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.
7-2. DRY ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns ON.
(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. (7-1.1.)
7-3. HEAT ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns ON.
(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 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 temperature 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 condensing 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.
7-4. AUTO CHANGE OVER ··· AUTO MODE OPERATION
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 2°C below the set
temperature.
HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2°C above the set
temperature.
NOTE 1
If two or more indoor units are operating in multi system, there might be a case that the indoor unit, which is operating in
(AUTO), cannot change over to the other operating mode (COOL ↔ HEAT) and becomes a state of standby.
Refer to NOTE 2 ”FOR MULTI SYSTEM AIR CONDITIONER”.
13
NOTE 2
FOR MULTI SYSTEM AIR CONDITIONER
OUTDOOR UNIT : MXZ series
Multi system air conditioner can connect two or more indoor units with one outdoor unit.
•When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and the others for heating, the operation mode of the indoor unit that operates earlier is selected. Other
indoor units cannot operate, and operation indicator lamp flashes as shown in the figure below. In this case,
please set all the indoor units to the same operation mode.
OPERATION INDICATOR
Lighted
or
Blinking
Not lighted
•When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes
(max. 10 minutes) to blow out the warm air.
•In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant
flowing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.
7-5. 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.
MSZ-GC22/25/35/50
MSZ-GC60/71
(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.
Confirming of standard position is performed in the following cases:
(a) When the operation starts or finishes (including timer operation).
(b) When the test run starts.
(c) When standby mode (only during multi system operation) starts or finishes.
(4) VANE AUTO ( ) mode
The microprocessor automatically determines the vane angle and operation to make the optimum room temperature distribution.
COOL and DRY operation
Vane angle is fixed to Horizontal position or Angle 1.
HEAT operation
Vane angle is fixed to Angle 4.
Upward
14
(5) STOP (operation OFF) and ON TIMER standby
In the following cases, the horizontal vane returns to the closed position.
(a) When OPERATE/STOP (ON/OFF) button is pressed (POWER OFF).
(b) When the operation is stopped by the emergency operation.
(c) When ON TIMER is ON standby.
(6) Dew prevention
During COOL or DRY operation with the vane angle at Angle 2 ~ 4 (GC22/25/35/50) / Angle 4 or 5 (GC60/71) 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
The horizontal vane position is set to Upward.
NOTE : When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat OFF, this
control doesn’t work in the indoor unit.
(9) To change the air flow direction not to blow directly onto your body. (MSZ-GC22/25/35/50)
To change the airflow
direction
Pressing and holding
VANE CONTROL button
for 2 seconds or more,
the horizontal vane
reverses and moves
horizontal position.
Horizontal
position
When to use this function?
COOL/DRY
HEAT
Use this function if you don’t
want the air from the indoor
unit to blow directly onto
your body.
• Depending on the shape
of the room, the air may
blow directly onto your
body.
The air conditioner starts
the cooling or drying operation approx. 3 minutes after
the vane has moved to the
horizontal position.
• When VANE CONTROL
button is pressed again,
the vane returns to the
previously-set position and
the air conditioner starts
the cool or dry operation in
approx. 3 minutes.
The air conditioner starts
heating operation approx.
3 minutes after the vane
has moved to the horizontal
position.
• Sometimes the area
around your feet may
not warm. To warm the
area around the feet, set
the horizontal vane to
(AUTO) or the downwardblowing position.
• Press VANE CONTROL
button again to return the
vane to the previously-set
position.
• When VANE CONTROL
button is pressed again,
the vane returns to the
previously-set position and
the air conditioner starts
the heat operation in approx. 3 minutes.
NOTE :
• If you make the airflow not to blow directly onto your body by pressing VANE CONTROL button, the compressor stops
for 3 minutes even during the operation of the air conditioner.
• The air conditioner operates with Very Low speed until the compressor turns on again.
(10) ECONO COOL ( ) operation (ECONOmical operation)
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 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 or VANE CONTROL button is
pressed or LONG button is pressed or change to other operation mode.
15
(11) LONG (
) MODE (MSZ-GC60/71)
By pressing LONG button indoor fan speed becomes faster than setting fan speed on the remote controller, and the
horizontal vane moves to the position for LONG mode. The remote controller displays “
”. LONG mode is cancelled
when LONG button is pressed once again or VANE button is pressed or ECONO COOL button is pressed in COOL
mode.
• In the following example, the vertical vane is set to
(front.).
COOL / DRY
HEAT
Fan speed : Faster
Solid arrow : When the LONG mode is used.
Dotted arrow : When the LONG mode is not used.
2. Vertical vane (MSZ-GC60/71)
(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
2
3
4
SWING
5
6
(3) Positioning
The vane is once pressed to the vane stopper to confirm the standard position and set to the desired angle.
Confirming of standard position is performed in case of follows.
(a) When OPERATE/STOP (ON/OFF) button is pressed (POWER ON/OFF).
(b) When SWING is started or finished.
(c) When 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
or
is selected.
16
7-6. 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 (
and
) to set the current time.
• Each time FORWARD button (
) is pressed, the set time increases by 1 minute, and each time BACK
) is pressed, the set time decreases by 1 minute.
WARD button (
• 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 (
and
).
OFF timer setting
(a) Press OFF TIMER button (
) during operation.
(b) Set the time of the timer using TIME SET buttons (
and
).
Each time FORWARD button (
) is pressed, the set time increases by 10 minutes; each time BACKWARD 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(
).
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.
(Example 2) The current time is 11:00 AM.
The unit turns off at 11:00 PM, and on at 6:00 AM.
The unit turns on at 5:00 PM, and off at 9:00 PM.
NOTE : If the main power is turned off or a power failure occurs while ON/OFF timer is active, the timer setting is cancelled. As these models are equipped with an auto restart function, the air conditioner starts operating with timer
cancelled when power is restored.
17
7-7. EMERGENCY/TEST OPERATION
In case of test run operation or emergency operation, use EMERGENCY OPERATION switch on the right side 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 runs at High
speed and the system is in continuous operation (The thermostat does not work).
After 30 minutes of test run operation, the system shifts to EMERGENCY COOL/HEAT MODE with a set temperature of
24°C. The fan speed shifts to Med..
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.
Operation mode
Set temperature
Fan speed
Horizontal vane
COOL
24°C
Med.
Auto
HEAT
24°C
Med.
Auto
The operation mode is indicated by the
Operation Indicator lamp as following
Operation Indicator lamp
EMERGENCY OPERATION switch
or
EMERGENCY COOL
This picture shows MSZ-GC22/25/35.
(Refer to “1. PARTS NAMES AND FUNCTIONS” for the other
models.)
↓
↓
or
EMERGENCY HEAT
↓
STOP
Lighted
Not lighted
↓
or
7-8. 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
TROUBLESHOOTING
MSZ-GC22NA MSZ-GC25NA MSZ-GC35NA MSZ-GC50NA MSZ-GC60NA MSZ-GC71NA
8-1. 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 main unit first with the remote controller, and after confirming 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 P.C. board.
3) When removing the 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
18
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 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 8-2., 8-3. and 8-4.
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 a thin instrument, 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.
5. How to install the horizontal vane
MSZ-GC22/25/35
If horizontal vane is not installed correctly, all of the operation indicator lamps will blink.
In this case, install the horizontal vane correctly by following the procedures to .
NOTE : Before installation of the horizontal vane, turn OFF the power supply.
2
In procedure lock the
stoppers until they click
into place.
Lock
1
MSZ-GC50
If horizontal vane is not installed correctly, all of the operation indicator lamps will blink.
In this case, install the horizontal vane correctly by following the procedures to .
NOTE : Before installation of the horizontal vane, turn OFF the power supply.
1
2
Stopper
In procedure lock the
stoppers until they click
into place.
Left
Lock.
Insert this end first.
19
8-2. 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 (8-4.) 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
MSZ-GC22/25/35/50
MSZ-GC60/71
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
Does upper or left lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of
0.5 seconds?
Blinks: Either indoor or outdoor unit is abnormal.
Beep is emitted at the same timing as the
blinking of upper or left lamp of OPERATION INDICATOR lamp. 2
Yes
(Blinks)
Judgment of indoor/outdoor abnormality
Before blinking, does upper or left lamp of
OPERATION INDICATOR lamp stay ON for 3
seconds?
Yes
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
No
1. Regardless of normal or abnormal condition, a short
beep is emitted once the signal is received.
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnormalities that can't be recalled with this way.
Confirm if outdoor unit is abnormal according to the detailed outdoor unit
failure mode recall function.
No
(OFF)
The indoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the indoor unit
failure mode table. (Refer to 8-2.2)
Make sure to check at least two consecutive blinking cycles.
2
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.)
3
Make sure to check at least two consecutive blinking cycles.
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 0.52.5-second OFF second interval
Blinking at 0.52.5-second OFF second interval
ON
OFF
Beeps
Repeated cycle
Beeps
Repeated cycle
3.Blinking pattern when the outdoor unit is abnormal:
Blinking at 0.52.5-second OFF
3-second ON
second interval
Beeps
Repeated cycle
2.5-second OFF
3-second ON
Blinking at 0.5second interval
ON
OFF
No beep
Repeated cycle
Beeps
No beep
Repeated cycle
20
Beeps
Repeated cycle
2. Indoor unit failure mode table
Upper or left lamp
Abnormal point
of OPERATION
(Failure mode)
INDICATOR lamp
Not lighted
Normal
Condition
Correspondence
—
The room temperature thermistor short or
1-time flash every Room temperature
open circuit is detected every 8 seconds dur0.5-second
thermistor
ing operation.
Indoor coil
2-time flash
The indoor coil thermistor short or open circuit
2.5-second OFF
is detected every 8 seconds during operation.
thermistor
3-time flash
The serial signal from outdoor unit is not reSerial signal
2.5-second OFF
ceived for a maximum of 6 minutes.
The rotational frequency feedback signal is
11-time flash
Indoor fan motor
not emit during the 12 seconds the indoor fan
2.5-second OFF
operation.
It cannot properly read data in the nonvolatile
12-time flash
Indoor control
memory of the indoor electronic control P.C.
2.5-second OFF
system
board.
—
Refer to the characteristics of the room temperature
thermistor (8-7.).
Refer to the characteristics of the main indoor coil thermistor, the sub indoor coil thermistor (8-7.).
Refer to 8-6. "How to check miswiring and serial
signal error".
Refer to 8-6.
"Check of indoor fan motor".
Replace the indoor electronic control P.C. board.
NOTE : Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (8-4.).
21
8-3. INSTRUCTION OF TROUBLESHOOTING
Start
Indoor unit operates.
Outdoor unit
doesn't operate.
Outdoor unit
operates only
in Test Run
operation.
Check room
temperature
thermistor.
Refer to 8-7.
"Test point
diagram and
voltage".
Outdoor
unit doesn't
operate even
in Test Run
operation.
Refer to "How
to check
inverter/compressor".
Indoor unit operates.
Outdoor unit doesn't
operate normally.
Unit doesn't
operate normal operation
in COOL or
HEAT mode.
Refer to
"Check of R.V.
coil".
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
operates, when
EMERGENCY
OPERATION
switch is pressed.
Refer to 8-6.
"Check of remote
controller and
receiver P.C.
board".
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
Indoor unit
doesn't operate,
when EMERGENCY OPERATION switch is
pressed.
If blinking of OPERATION INDICATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
1. Check indoor/outdoor connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 8-6. "Check
of indoor electronic
control P.C. board and
indoor fan motor".
"Test Run operation" means
the operation within 30 minutes
after EMERGENCY OPERATION switch is pressed.
Refer to outdoor unit service manual.
GC22/25/35/50
All lamps
Flash on and
off at 0.5-second intervals
Cause:
Indoor unit
• The horizontal vane is
not installed
correctly.
Upper or left
lamp Flash
on and off at
0.5-second
intervals
Cause:
Indoor/Outdoor
unit
• Miswiring
or trouble of
serial signal
Upper or left
lamp 2-time
flash Cause:
Indoor unit
• Trouble
of room
temperature
/ indoor coil
thermistor
Upper or left
lamp
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Upper or left
lamp 4-time
flash Cause:
Indoor unit
• Trouble
of indoor
unit control
system
Upper or left
lamp 5-time
flash Cause:
Outdoor unit
• Outdoor
power
system
abnormality
Upper or left
lamp 6-time
flash Cause:
Outdoor unit
• Trouble of
thermistor in
outdoor unit
Upper or left
lamp 7-time
flash Cause:
Outdoor unit
• Trouble of
outdoor control system
Upper or left
lamp 14-time
flash Cause:
Outdoor unit
• Other abnormality
Refer to 8-6.
"Check
of installation of the
horizontal
vane".
Refer to 8-6.
"How to
check miswiring and
serial signal
error".
Check room Refer to 8-6.
temperature
"Check of
thermistor
indoor fan
and indoor
motor".
coil thermistor. Refer
to 8-7."Test
point diagram
and voltage".
Replace the
indoor electronic control
P.C. board.
Refer to
"How to
check
inverter/compressor".
Refer to
"Check of
outdoor thermistors".
Replace the
inverter P.C.
board or
the outdoor
electronic
control P.C.
board.
Check "Flow
chart of the
detailed
outdoor unit
failure mode
recall function."
22
8-4. 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.
OPERATION INDICATOR
Lighted
or
Blinking
Not lighted
No.
1
Abnormal
point
Miswiring
or serial
signal
Indoor coil
thermistor
2
Room temperature
thermistor
Operation indicator lamp
Symptom
Condition
Upper or left lamp flashes.
0.5-second ON
The serial signal from the outdoor unit is not
received for 6 minutes.
0.5-second OFF
Upper or left lamp flashes.
2-time flash
Correspondence
• Refer to 8-6. "How to check
miswiring and serial signal error".
The indoor coil or the room temperature thermistor is short or open circuit.
• Refer to 8-7. the characteristics
of indoor coil thermistor, and
the room temperature thermistor.
The rotational frequency feedback signal is
not emitted during the indoor fan operation.
• Refer to 8-6. "Check of indoor fan motor".
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
• Replace the indoor electronic
control P.C. board.
2.5-second OFF
Upper or left lamp flashes.
3-time flash
3
Indoor fan
motor
2.5-second OFF
Upper or left lamp flashes.
4-time flash
4
Indoor control system
2.5-second OFF
5
Outdoor
power system
Upper or left lamp flashes.
5-time flash
Indoor unit and
outdoor unit do
not operate.
2.5-second OFF
• Refer to "How to check of inIt consecutively occurs 3 times that the comverter/compressor".
pressor stops for overcurrent protection or
Refer to outdoor unit service
start-up failure protection within 1 minute after
manual
start-up.
• Check the stop valve.
Upper or left lamp flashes.
6-time flash
6
Outdoor
thermistors
The outdoor thermistors short or open circuit
during the compressor operation.
• Refer to "Check of outdoor
thermistor".
Refer to outdoor unit service
manual.
It cannot properly read data in the nonvolatile
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.
An abnormality other than above mentioned
is detected.
• Check the stop valve.
• Confirm the abnormality in
detail using the failure mode
recall function for outdoor unit.
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the outdoor electronic control P.C. board.
• Check the blinking pattern of
the LED on the inverter P.C.
board or the outdoor electronic
control P.C. board.
2.5-second OFF
7
Outdoor
control system
Upper or left lamp flashes.
7-time flash
2.5-second OFF
Upper or left lamp flashes.
14-time flash
8
Other abnormality
2.5-second OFF
9
Outdoor
control sys- Upper or left lamp lights up
tem
Outdoor unit
does not operate
23
or
No.
1
Abnormal
point
Operation indicator lamp
GC22/25/35 All lamps flash at the same time.
/50
Attachment 0.5-second ON
of the horizontal vane 0.5-second OFF
Symptom
Condition
Indoor unit and
outdoor unit do
not operate.
The electricity is not conducted to the interlock switch (Fan) of the horizontal vane.
Correspondence
• Refer to 8-6. "Check of installation of the horizontal vane".
or
No.
1
Abnormal
point
MXZ type
Operation
mode
setting
Operation indicator lamp
Upper or left lamp lights and lower or right
lamp flashes.
2.5-second OFF
Symptom
Condition
Correspondence
The operation mode of the each indoor unit
Outdoor unit
is differently set to COOL (includes DRY) and • Unify the operation mode.
operates but
HEAT at the same time, the operation mode
Refer to outdoor unit service
indoor unit does
of the indoor unit that has operated at first has manual.
not operate.
the priority.
8-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-GC22NA MSZ-GC25NA MSZ-GC35NA MSZ-GC50NA MSZ-GC60NA MSZ-GC71NA
Indoor fan motor (MF)
GC35NA- C2
GC50/60/71
GC22/25/35/50
Horizontal vane motor
(MV)
Measure the resistance between the terminals with a tester.
(Part temperature 10 ~ 30°C)
Color of lead wire
WHT - BLK
BLK - RED
Normal
273 ~ 296 Ω
295 ~ 320 Ω
MAIN
AUX.
FUSE
Color of lead wire
BRN - YLW
Normal range
4.5 ~ 5.5 V
BRN - GRY
(When fan revolved one time)
0V 5V 0V
(Approx.)
WHT
Measure the voltage power ON.
BLK
BRN
YLW
GRY
RED
Indoor fan motor (MF)
GC22/25
GC35NA- C1
INNER FUSE
BA : 135 ± 3°C CUT
OFF
CA : 140 ± 2°C CUT
OFF
Figure
Refer to 8-7. "Test point diagram and voltage", "2. Indoor electronic control
P.C. board", the chart of thermistor.
Motor part
Indoor coil thermistor
(RT12, RT13)
Check method and criterion
Measure the resistance with a tester.
Sensor part
Part name
Room temperature
thermistor (RT11)
Check 8-6. .
Measure the resistance between the terminals with a tester.
(Part temperature 10 ~ 30°C)
Color of the lead wire
Normal
RED - BLK
235 ~ 255 Ω
GC60/71
Measure the resistance between the terminals with a tester.
Horizontal vane motor (Part temperature 20 ~ 30°C)
(MV1)
Color of the lead wire
Normal
Vertical vane motor
RED
BLK
240
~ 260 Ω
(MV2)
24
RED
ROTOR
YLW
BRN
ORN
GRN
RED
ROTOR
YLW
BRN
ORN
GRN
8-6. TROUBLESHOOTING FLOW
A Check of indoor fan motor
The indoor fan motor error has occurred, and the indoor fan doesn't operate.
MSZ-GC22/25/NA
MSZ-GC35/NA - C1
Turn OFF the power supply.
Check connector CN211 visually.
Reconnect the lead wires.
No
Are lead wires connected?
Are soldered points of the connector
correctly soldered to indoor power
P.C. board?
Yes
(open circuit)?
Yes ( 0 or
)
No
(Others)
Turn ON the power supply. Rotate indoor fan slowly for 1
revolution or over with a screwdriver etc. from air outlet, and
measure the voltage No.2(+) and No.1(-) on CN121.
No
Replace the indoor fan motor.
Resolder it.
Yes
Disconnect the lead wires from connector CN211 on indoor power P.C. board.
Measure the resistance between lead wires No.1 and No.4 and then No.4 and No.7.
Is the resistance 0 (short circuit) or
No
Does the voltage repeat 0 and 5 VDC?
Yes
Indoor terminal
P.C.board
Indoor power P.C.board
Fuse (F11)
Replace the indoor power P.C. board and the indoor
terminal P.C. board and the indoor electronic control
P.C. board.
CN121
Varistor
(NR11)
CN211
25
MSZ-GC35/NA -
C2
Turn OFF the power supply.
Pay careful attention to the high voltage on the fan motor connector CN211.
Is there any foreign matter that interferes
the rotation of the line flow fan?
Turn ON the power supply, wait 5 seconds or more, and press EMERGENCY OPERATION switch.
Measure the supply voltage as follows within 12 seconds after EMERGENCY 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.
<Indoor power P.C. board>
1. Measure the voltage between CN211 (+) and (–).
2. Measure the voltage between CN211 (+) and (–).
<Indoor electronic control P.C. board>
1. Measure the voltage between CN10A (+) and JPG(GND)(–).
No
Yes
Remove the foreign matter and
adjust the line flow fan.
Is there 311-325 VDC
between CN211 (+)
and (–) ?
If more than 12 seconds passes after EMERGENCY OPERATION switch
is pressed, the voltage mentioned above 2 goes 0 VDC although the
indoor P.C. board is normal
Does the voltage between CN211
(+) and (–) on the power P.C. board
rise to the range of 2 to 6 VDC within
12 seconds after EMERGENCY
OPERATION switch is pressed?
Yes
Replace the indoor fan motor.
Yes
No
No
Replace the indoor power
P.C. board and the indoor
terminal P.C. board.
Yes
Does the voltage between CN10A
(+) and JPG (GND)(–) on the indoor
electronic control P.C. board fall to
2 V or less within 12 seconds after
EMERGENCY OPERATION switch is
pressed?
Replace the indoor electronic
control P.C. board.
No
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
(+) and (–) while the fan motor is
rotating.
Is it unchanged holding
0 or 15 VDC?
Yes
(Unchanged)
Measure the voltage CN10A (+)
and JPG (GND)(–) on the indoor
No
electronic control P.C board when
(Changed) the fan motor is rotaring.
Replace the indoor fan motor.
Replace the indoor power P.C.
board and the indoor terminal P.C.
board.
Indoor electronic
control P.C. board
Is it unchanged holding
0 or 15 VDC?
Yes
(Unchanged)
Indoor terminal
P.C.board
JPG (GND)
Replace the indoor
electronic control P.C.
board.
Indoor power P.C.board
Fuse (F11)
CN10A
No
(Changed)
Varistor
(NR11)
26
CN211
MSZ-GC50/60/71NA
Turn OFF the power supply.
Pay careful attention to the high voltage on the fan motor connector CN211.
Is there any foreign matter that interferes
the rotation of the line flow fan?
Turn ON the power supply, wait 5 seconds or more, then press EMERGENCY OPERATION switch.
Measure the supply voltage as follows within 12 seconds after EMERGENCY 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.
1. Measure the voltage between CN211 (+) and (-).
2. Measure the voltage between CN211 (+) and (-).
No
Yes
If more than 12 seconds 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 311-325 VDC between
CN211 (+) and (-), and does the
voltage between CN211 (+) and (-)
rise to the range of 3 to 6 VDC within
12 seconds after EMERGENCY
OPERATION switch is pressed?
CN211
Yes
Replace the indoor fan motor.
Indoor electronic
control P.C. board
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
(+) and (-) while the fan motor is
rotating.
Is it unchanged holding
0 or 15 VDC?
Yes
(Unchanged)
Replace the indoor fan motor.
27
No
(Changed)
Replace the indoor electronic control P.C. board.
B Check of remote controller and indoor P.C. board
Check if the remote controller is exclusive for this air conditioner.
Press OPERATE/STOP (ON/OFF)
button on the remote controller.
Is LCD display on the remote controller visible?
Yes
No
(Not clear)
Replace the batteries. (Refer to 8-1.4.)
Remove the batteries, then set them back
and press RESET button. (Refer to 8-1.4.)
Check if the unit operates with the remote
controller.
Does the unit operate with the
remote controller?
No
Turn ON a radio to AM and press
OPERATE/STOP (ON/OFF) button on the
remote controller.
Yes
OK
Is noise heard from radio?
No
Replace the remote controller.
Yes
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1 m?
GC22/25/35/50
Yes
• Reinstall the unit away from lights.
• Attach a filter on receiving part.
No
GC60/71
Measure the voltage between receiver P.C. board connector CN301 No.2(+) and No.3(-) when the remote
controller button is pressed.
Is the voltage approx. 4 VDC?
Replace the indoor electronic control
P.C. board. (Including the receiver)
No
(5 or 0 VDC)
Replace the receiver P.C. board.
28
Yes
Replace the indoor electronic control P.C.
board.
C Check of indoor P.C. board and indoor fan motor
MSZ-GC22/25/35NA
Turn OFF the power supply.
Remove indoor fan motor connector CN211
from indoor power P.C. board and vane
motor connector CN151 from the indoor
electronic control P.C. board and turn ON
the power supply.
Does the unit operate with the remote
controller?
Does OPERATION INDICATOR lamp light
up by pressing EMERGENCY OPERATION
switch?
No
Yes
Measure the resistance of indoor fan
motor. Refer to 8-5.
Short circuit :
Replace the indoor fan motor.
Measure the resistance of the vane
motor coil. Refer to 8-5.
Short circuit :
Replace the vane motor and the indoor
electronic control P.C. board.
Replace the varistor (NR11)
and fuse (F11).
Yes
Are the varistor (NR11)
burnt and the fuse (F11)
blown?
Turn OFF the power supply.
Check both “parts side” and “pattern side” of the indoor terminal P.C.
board visually.
Be sure to check both the fuse
and the varistor in any case.
Is the fuse (F11) blown
only?
GC25
GC35NA -
No
No
Yes
GC35NA -
C1
Measure the resistance between
CN211 (+) and (-) of indoor fan
motor connector. 1, 2
Measure the resistance of indoor fan
motor. Refer to 8-5.
Is the resistance
normal?
No
Yes
C2
Replace the fuse (F11)
and the indoor fan motor.
3
No
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.
Is the resistance 1MΩ
or more?
Yes
3. Please replace the fuse after
removing the indoor terminal P.C.
board from the electrical box.
Replace the fuse (F11).
3
Measure the resistance of cement
resistor R111 on the indoor power
P.C. board.
Is the resistance approx.
4 Ω?
Replace the indoor power P.C. board
and the indoor terminal P.C. board and
the indoor fan motor.
No
Yes
Is the approx. 5 VDC between 5V
(+) and JPG (GND) (-) of the indoor
electronic control P.C. board? Is there
approx. 9 to 13 VDC between 12 V
(+) and JPG (GND) (-) of the indoor
electronic control P.C. board.
Yes
Replace the indoor fan motor.
No
Indoor electronic
control P.C.board
JPG (GND)
Are connector CN10A on the
indoor electronic control P.C.
board or lead wires disconnected?
No
Yes
CN10A
12VDC
Replace the indoor power P.C. board and the
indoor terminal P.C. board.
5VDC
Indoor terminal
P.C.board
Indoor power P.C.board
R111
Fuse (F11)
Varistor
(NR11)
CN211
29
Connect the connector or repair disconnection.
MSZ-GC50/60/71NA
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.
Does the unit operate with the remote
controller?
Does OPERATION INDICATOR lamp light
up by pressing EMERGENCY OPERATION
switch?
No
Yes
Measure the resistance between
CN211 and of the indoor fan motor
connector.
Short/open circuit:
Replace the indoor fan motor.
Measure the resistance of the horizontal vane motor coil.
Refer to 8-5.
Short/open circuit:
Replace the horizontal vane motor and the
indoor electronic control P.C. board.
Replace the varistor (NR11)
and the fuse (F11).
Turn OFF the power supply.
Check both “parts side” and “pattern
side” of the indoor electronic control
P.C. board visually.
Yes
Are the varistor (NR11)
burnt and the fuse (F11)
blown?
No
Be sure to check both the fuse
and the varistor in any case.
Is the fuse (F11) blown
only?
No
Yes
Measure the resistance between
(+) and (-) of the indoor fan motor
connector (to CN211 on the indoor
electronic control P.C. board) . 1, 2
Is the resistance 1 MΩ
or more?
No
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.
Replace the fuse (F11) and the indoor fan motor.
Yes
Replace the fuse. (F11)
Measure the resistance of cement
resistor (R111) on the indoor electronic control P.C. board.
Is the resistance approx.
4 Ω?
No
Replace the indoor electronic control P.C.
board and the indoor fan motor.
Yes
Replace the indoor electronic control P.C. board.
Indoor electronic
control P.C. board
Varistor (NR11)
Fuse (F11)
CN211
30
D How to check miswiring and serial signal error
MSZ-GC22/25/35NA
Turn OFF the power supply.
Is there rated voltage in the
power supply?
Check the power supply.
No
Yes
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
Yes
Check the wiring.
No
Press EMERGENCY OPERATION switch once.
Does the upper lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power
to the indoor unit>
Yes
No
Is serial signal error indicated 6 minutes later?
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor connecting wire?
No
No
Yes
Yes
Correct them.
A
Turn OFF the power supply.
Check once more if the indoor/outdoor
B connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
and S3. 1
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.
3. Be sure to check this within 3 minutes after turning ON.
After 3 minutes, LED blinks 6 times. Even when the
inverter P.C. board or the outdoor electronic control P.C.
board is normal, LED blinks 6 times after 3 minutes.
(Except for outdoor unit of multi system type)
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-secondON quick blinking"? 3
Yes
A
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press EMERGENCY OPERATION
switch.
Is serial signal
error indicated 6
minutes later?
Yes
B
• Reinstall
either the unit
or the light
each other
away.
• Attach a filter
No on remote
control receiving section
of the indoor
unit.
Turn OFF the power supply.
Remove the short-circuit between outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20 VDC
between indoor terminal block S2 and
S3? <Confirmation of serial signal>
Is there rated voltage between indoor
terminal block S1 and S2?
<Confirmation of power voltage>
No
(Lighted
or not
lighted)
No
Replace the inverter P.C. board or the
outdoor electronic control P.C. board.
2
2. Be careful to the residual
voltage of smoothing capacitor.
Is there any error of the indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
Yes
Replace the
indoor/outdoor
connecting wire.
No
Yes
Is there 2 VDC or less between CN10A (+)
and JPG (GND)(-) on the indoor electronic
control P.C. board?
No
Yes
Is there 2 VDC or less between
CN10A (+) and JPG (GND)(-) on
the indoor electronic control P.C.
board?
No
Yes
Replace the indoor power P.C. board
and the indoor terminal P.C. board
Is there 2 VDC or less between
CN10A (+) and JPG (GND)(-) on
the indoor electronic control P.C.
board?
No
Replace the indoor electronic control P.C. board.
Be sure to release the failure-mode recall function after checking.
31
Yes
MSZ-GC50/60/71NA
Turn OFF the power supply.
Is there rated voltage in the
power supply?
Yes
Check the power supply.
No
Turn ON the power supply.
Is there rated voltage between outdoor terminal block S1 and S2?
Yes
No
Check the wiring.
Press EMERGENCY OPERATION switch once.
Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the
power to the indoor unit>
Yes
No
Is serial signal error indicated 6 minutes later?
Yes
Is there any miswiring, poor
contact, or wire disconnection
of the indoor/outdoor connecting wire?
No
Yes
Correct them.
No
A
Turn OFF the power supply.
Check once more if the indoor/outdoor
B connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
and S3. 1
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.
3. Be sure to check this within 3 minutes after turning ON. After
3 minutes, LED blinks 6 times. Even when the inverter P.C.
board or the outdoor electronic control P.C. board is normal,
LED blinks 6 times after 3 minutes.
(Except for outdoor unit of multi system type)
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-secondON quick blinking"? 3
Yes
A
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press EMERGENCY OPERATION
switch.
Is serial signal
error indicated 6
minutes later?
Yes
B
• Reinstall
either the unit
or the light
each other
away.
• Attach a filter
No on remote
control receiving section
of the indoor
unit.
Turn OFF the power supply.
Remove the short-circuit between
outdoor 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 rated voltage between
indoor terminal block S1 and S2?
<Confirmation of power voltage>
Yes
No
(Lighted
or not
lighted)
Is there any error of the indoor/outdoor connecting wire,
such as the damage of the wire,
Yes
intermediate connection, poor
contact to the terminal block?
No
No
No
Replace the inverter P.C. board or the
outdoor electronic control P.C. board.
2
2. Be careful to the residual voltage of smoothing
capacitor.
Is there any error of the indoor/outdoor connecting wire,
such as the damage of the wire,
Yes
intermediate connection, poor
contact to the terminal block?
No
Replace the indoor electronic control P.C. board.
Be sure to release the failure-mode recall function after checking.
32
Replace the indoor/
outdoor connecting
wire.
Replace the indoor/
outdoor connecting
wire.
E Check of installation of the horizontal vane
MSZ-GC22/25/35/50NA
Turn OFF the power supply.
Is the stopper of the horizontal vane
locked to the indoor unit correctly?
Yes
No
Relock the stopper of the horizontal vane to the indoor unit.
(Refer to 8-1.5.)
Turn ON the
power supply.
Are all lamps flashing?
Yes
To check the continuity of the interlock
switch (Fan), measure the resistance of
connector - connected to CN1R1 on
the indoor electronic control P.C. board.
Is there resistance 0 Ω?
Yes
No( )
Turn OFF the power supply.
Replace the interlock switch (Fan).
Replace the indoor electronic
control P.C. board.
33
No
OK
F Electromagnetic noise enters into TV sets or radios
Is the unit earthed?
Yes
Is the distance between the antennas
and the indoor unit within 3 m, or is the
distance between the antennas and the
outdoor unit within 3 m?
No
Earth the unit.
No
Yes
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Is the distance between the TV sets or
radios and the indoor unit within 1 m, or
is the distance between the TV sets or
radios and the outdoor unit within 3 m?
No
Yes
Extend the distance between the TV sets and/or
radios and the indoor unit, or the TV sets or
radios and the outdoor unit.
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the antenna wiring?
No
Yes
Replace or repair the antenna.
Replace or repair the coaxial cable.
Yes
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wiring of the antennas.
Is the indoor/outdoor connecting wire
of the air conditioner and the wiring of
the antennas close?
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 following 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, earth 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.
34
8-7. Test point diagram and voltage
1. Indoor power P.C. board, Indoor terminal P.C. board
MSZ-GC22NA MSZ-GC25NA MSZ-GC35NA Indoor terminal P.C. board
C1
Indoor power P.C. board
Varistor (NR11)
Fuse (F11)( )
Cement resistor (R111)
Indoor fan motor
(CN211)
220-230V AC
Terminal
block
Connector to indoor electronic
control P.C. board (CN20A)
5VDC
12VDC CN121
GND
Please replace the fuse after removing the indoor terminal P.C. board from the electrical box.
MSZ-GC35NA -
C2
Indoor terminal P.C. board
Fuse (F11)( )
Indoor power P.C. board
Varistor (NR11)
Cement resistor (R111)
311-325 VDC
(-) Fiducial terminal of
cathode side on measuring high-voltage DC
15 VDC
(+)3-6 VDC
(+)0 or 15 VDC
Terminal
block
Connector to indoor electronic
control P.C. board (CN20A)
5 VDC
12 VDC
GND
Please replace the fuse after removing the indoor terminal P.C. board from the electrical box.
35
2. Indoor electronic control P.C. board
MSZ-GC22NA MSZ-GC25NA MSZ-GC35NA
Timer short mode
point JPG JPS
(Refer to 6-1.)
Room temperature thermistor RT11 (CN111)
Indoor coil thermistor RT12, RT13 (CN112)
GND
Interlock switch(FAN)(CN1R1)
Connector to
Indoor power P.C. board
(CN10A)
12 VDC
Emergency operation
switch (E.O.SW) (SW1)
Room temperature thermistor (RT11)
Indoor coil thermistor (RT12, RT13)
Resistance (k )
Vane motor (CN151)
5 VDC
Release of Auto restart function
Solder the Jumper wire to JR07
(Refer to 6-3.)
Temperature (°C)
36
MSZ-GC50NA
Varistor (NR11)
Power supply input
220-230 VAC
Fuse(F11)
Cement resistor
(R111)
Indoor fan motor
(CN211)
311-325 VDC
(-) Fiducial terminal of
cathode side on measuring high-voltage DC
15 VDC
(+)3-6 VDC
(+)0 or 15 VDC
Release of Auto restart
function
Solder the Jumper wire
to JR07
(Refer to 6-3.)
Interlock switch(Fan)
(CN1R1)
5 VDC
Indoor coil thermistor
RT12,RT13(CN112)
Horizontal vane
motor(CN151)
Room temperature
thermistor(RT11)
Timer short mode
point JPG, JPS
(Refer to 6-1.)
Power monitor
receiver P.C.
board
Room temperature thermistor (RT11)
Indoor coil thermistor (RT12, RT13)
SW P.C. board
Resistance (k )
Emergency
operation switch
12 VDC
Temperature (°C)
37
MSZ-GC60NA MSZ-GC71NA
Release of Auto restart
function
Solder the Jumper wire
to JR07
(Refer to 6-3.)
Varistor (NR11)
Power supply input
220-230V AC
Fuse(F11)
Cement resistor
(R111)
Indoor fan motor
(CN211)
311-325 VDC
(-) Fiducial terminal of
cathode side on measuring high-voltage DC
Display
P.C.
board
15 VDC
(+)3-6 VDC
(+)0 or 15 VDC
5 VDC
Indoor coil thermistor
RT12,RT13(CN112)
Horizontal vane
motor(CN151)
Room temperature
thermistor(RT11)
12 VDC
Timer short
mode point
JPG, JPS
(Refer to 6-1.)
Vertical vane motor (CN152)
Receiver
P.C. board
Room temperature thermistor (RT11)
Indoor coil thermistor (RT12, RT13)
SW P.C. board
Resistance (k )
Emergency
operation switch
Temperature (°C)
38
9
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
Locking lever
Slide the sleeve.
Pull the terminal while
pushing the locking
lever.
Hold the sleeve, and
pull out the terminal
slowly.
Connector
9-1. MSZ-GC22NA MSZ-GC25NA MSZ-GC35NA
OPERATING PROCEDURE
PHOTOS
1. Removing the panel
Photo 1
(1) Remove the screw caps of the panel. Remove the
screws.
(2) Hold the lower ends part of the panel and pull it slightly
toward you, and then remove the panel by pushing it
upward.
Screws of the panel
2. Removing the indoor electronic control P.C.
board and the room temperature thermistor
Photo 2
(1) Turn the breaker OFF.
(2) Remove the panel (Refer to 1) and the corner box.
(3) Open the indoor electronic control P.C. board holder
(to right side), and disconnect connectors of the indoor
coil thermistor (CN112), vane motor (CN151), interlock
switch (CN1R1) and connector (CN10A) to the indoor
power P.C. board on the indoor electronic control P.C.
board.
(4) Unhook the catches of the indoor electronic control P.C.
board holder from the nozzle and the electrical box
(right side).
(5) Remove the room temperature thermistor from the
hook of the indoor electronic control P.C. board holder.
(6) Open the back side of the indoor electronic control P.C.
board holder, and remove the indoor electronic control
P.C. board.
(7) Remove the room temperature thermistor from the
indoor electronic control P.C. board.
39
Electrical box
Screw of the
electrical cover
V.A. clamp
Indoor coil
thermistor
Catch of indoor electronic Indoor electronic control
control P.C. board holder P.C. board holder
OPERATING PROCEDURE
PHOTOS
3. Remove the indoor power P.C. board, the indoor terminal P.C. board, and the electrical box
(1) Turn the breaker OFF.
(2) Remove the panel (Refer to 1) and the corner box.
(3) Remove the screw of V.A. clamp, and then the indoor/outdoor connecting wire.
(4) Remove the earth wire connected to the indoor heat
exchanger from the electrical box.
(5) Unhook first the lower, then the upper catches of the electrical box, and pull out the electrical box.
(6) Remove the screw of the electrical cover and remove the
electrical cover.
(7) Disconnect all the connectors on the indoor power P.C.
board and unhook all lead wires.
(8) Remove the screw of terminal block on the indoor terminal
P.C. board.
(9) Remove the indoor power P.C. board and the indoor terminal P.C. board.
Photo 3
Catch of indoor electronic
control P.C. board holder
Terminal block
Indoor terminal
P.C. board
Indoor power
P.C. board
Lower catch
Upper catch
Photo 4
4. Removing the vane motor
(1) Turn the breaker OFF.
(2) Remove the panel (refer to 1.) and the corner box.
(3) Remove the indoor electronic control P.C. board holder (refer
to 2.).
(4) Remove the screws of vane motor and remove the vane
motor.
(5) Disconnect the connector from vane motor.
40
Screws of the vane motor
OPERATING PROCEDURE
PHOTOS
5. Removing the indoor fan motor, the indoor coil thermistor, and the line flow fan
(1) Remove the panel (refer to 1.) and the corner box.
(2) Remove the indoor electronic control P.C. board holder (refer to 2.)
and the electrical box (refer to 3.) .
(3) Remove the drain hose from the nozzle assembly, and
remove the nozzle assembly.
(4) Loosen the screw fixing the line flow fan.
(5) Remove the screws fixing the motor bed. Lift the right side
of motor bed a little, and pull right to remove the fan motor
together with motor band/bed.
(6) Remove the indoor coil thermistor from the heat exchanger
( ) Install the indoor coil thermistor in its former position when
assembling it. (Photo 7)
(7) Remove the screws fixing the left side of the heat exchanger.
(8) Lift the left side of the heat exchanger, and pull out the line
flow fan to the lower-left.
Photo 5
Screws of the line flow fan
Photo 6
Photo 7
Indoor coil
thermistor (main)
RT12
Indoor coil
thermistor (sub)
RT13
41
Screws of the motor bed
9-2. MSZ-GC50NA
OPERATING PROCEDURE
PHOTOS
1. Removing the panel
Photo 1
(1) Remove the horizontal vane.
(2) Remove the screw caps of the panel. Remove the screws.
(Photo 1)
(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.
Screws of the panel
Horizontal vane
42
OPERATING PROCEDURE
PHOTOS
2. Removing the electronic control P.C. board, the power Photo 2
monitor receiver P.C. board, SW P.C. board and the
terminal block
(1) Remove the horizontal vane, the panel (refer to 1.) and the
corner box.
(2) Remove the screw of V.A. clamp, and the indoor/outdoor
connecting wire. (Photo 2)
(3) Remove the switch holder from the electrical cover. (See
Photo 3.)
(4) Remove the screw of the electrical cover, and the electrical
cover. (Photo 3)
(5) Remove the earth wire connected to the indoor electronic
control P.C. board from the electrical box. (Photo 4)
(6) Unhook the power monitor receiver P.C. board holder from
the catch. (Photo 4)
(7) Open the rear cover of the power monitor receiver P.C.
board holder and pull out the power monitor receiver P.C.
board.
(8) Open the switch holder and pull out SW P.C. board.
(9) Pull the electronic control P.C. board slightly toward you
from the electrical box, and disconnect TAB3 and all the
connectors on the electronic control P.C. board. (LD101
and LD105 are direct-mounted to the electronic control P.C.
board.)
(10) Pull out the electronic control P.C. board from the electrical
box.
(11) Remove the earth wire connected to the heat exchanger
from the electrical box. (Photo 4)
(12) Unhook the catches of the electrical box, and pull out the
electrical box.
(13) Remove the screws of the terminal block cover, and the terminal block cover and the terminal block holder. (Photo 2)
(14) Remove the terminal block by sliding it.
Screws of
the terminal
block cover
Drain hose
Screw of V.A. clamp
Photo 3
Switch holder
Screw of the
electrical cover.
Photo 4
Earth wires
Fan motor
connector (CN211)
Connector of the
interlock switch(Fan)
(CN1R1)
3. Removing the electrical box
(1) Remove the horizontal vane, the panel (refer to 1.) and the
corner box.
(2) Remove the screw of V.A. clamp, and the indoor/outdoor
connecting wire. (Photo 2)
(3) Remove the switch holder and the electrical cover. (Photo 3)
(4) Remove the ground wire connected to the heat exchanger
from the electrical box. (Photo 4)
(5) Disconnect the following connectors on the electronic
control P.C. board; the fan motor connector <CN211>, the
indoor coil thermistor connector <CN112>, the vane motor
connector <CN151>, the connector of the interlock switch
(Fan) of the horizontal vane <CN1R1>.
(6) Unhook the catches of the electrical box, and pull out the
electrical box.
Indoor coil thermistor
connector (CN112)
Vane motor
connector (CN151)
Power monitor
receiver P.C.
board holder
43
OPERATING PROCEDURE
PHOTOS
4. Removing the horizontal vane motor unit
Photo 5
(1) Remove the horizontal vane and the panel. (Refer to 1.)
(2) Remove the screws of the horizontal vane motor unit, and
pull out the horizontal vane motor unit. (Photo 5)
(3) Disconnect the connector from the horizontal vane motor
unit.
5. Removing the indoor fan motor and the line flow fan
(1) Remove the horizontal vane, the panel (refer to 1.) and the
corner box.
(2) Remove the switch holder and the electrical box. (Refer to 3.)
(3) Pull out the drain hose from the nozzle assembly, and
remove the nozzle assembly.
(4) Remove the screws fixing the motor bed. (Photo 6)
(5) Loosen the screw fixing the line flow fan. (Photo 7)
(6) Remove the motor bed together with fan motor and motor
band.
(7) Release the hooks of the motor band, and remove the
motor band then pull out the indoor fan motor.
(8) Remove the screws fixing the left side of the heat exchanger. (Photo 8)
(9) Lift the heat exchanger, and pull out the line flow fan to the
lower-left.
Screws of the
horizontal vane
motor unit
Photo 6
Screws of
the motor
bed
Photo 7
Screw of
the line flow
fan
Photo 8
Screws of the
left side of the
heat exchanger
44
Motor band
9-3.MSZ-GC60NA MSZ-GC71NA
OPERATING PROCEDURE
PHOTOS
1. Removing the front panel
(1) Remove the screw caps of the front panel. Remove the
screws.
(2) Pull the panel down to your side slightly and unhook the
catches at the top.
Photo 1
Front panel
Screws
2. Removing the electronic control P.C. board, the receiver
P.C. board and the display P.C. board
(1) Remove the front panel. (Refer to 1.)
(2) Remove the screw of the electrical cover. Remove the
electrical cover.
(3) Remove the screws of the cable clamp. Remove the cable
clamp.
(4) Remove the screw of the earth wires, which is soldermounted to the electronic control P.C. board and connected to the terminal block.
(5) While pulling the electronic control P.C. board forward little
by little, disconnect all the connectors from the board.
(6) Remove the R.L holder.
(7) Remove the electronic control P.C. board.
(8) Open the R.L holder, remove the receiver P.C. board and
the display P.C. board.
Photo 2
Screw of
the earth
wires
Fan motor
connector
Indoor
electronic
control
P.C. board
Vane motor
connector
Screw of
the electrical
cover
R.L
holder
3. Removing the electrical box
(1) Remove the front panel. (Refer to 1.)
(2) Remove the electrical cover. (Refer to 2.)
(3) Disconnect the connector of the indoor coil thermistors.
(4) Disconnect the motor connector (CN211) and the vane
motor connector (CN151 and CN152) on the electronic
control P.C. board.
(5) Remove the screw of earth wire to the heat exchanger.
(6) Remove the fan motor lead wire and indoor coil thermistor
from the electrical box.
(7) Remove the lead wire of vane motor from the bottom of
electrical box.
(8) Remove the screw fixing the electrical box and remove the
electrical box.
45
Photo 3
Indoor coil
thermistors
Receiver
P.C.
board
Screw of the
cable clamp
Screw of the
earth wire
Screw of the
electrical cover
Screw of the
electrical box
OPERATING PROCEDURE
PHOTOS
4. Removing the vane motor
(1) Remove the front panel. (Refer to 1.)
(2) Remove the electrical cover. (Refer to 2.)
(3) Remove the lead wire of vane motor. (Refer to 3.)
(4) Remove the R.L. holder.
(5) Pull out the drain hose from the nozzle assembly and
remove the nozzle assembly.
(6) Remove the screws of the vane motor and disconnect the
connector.
(7) Remove the vane motor.
Photo 5
Photo 4
Vane motors
Screws of the
vane motor
Vane motor
5. Removing the line flow fan and the indoor fan motor
(1) Remove the front panel. (Refer to 1.)
(2) Remove the electrical box. (Refer to 3.)
(3) Pull out the drain hose from the nozzle assembly and
remove the nozzle assembly.
(4) Remove the water cut.
(5) Slide the hole cover and remove the hole cover. (Photo 8)
(6) Remove the hexagon socket set screw from the line flow
fan.
(7) Remove the screws fixing the motor bed and remove the
fan motor. (Be careful not to drop the fan motor because it
is heavy.) (Photo 7)
(8) Remove the screws fixing the left side of the heat exchanger. (Photo 6)
(9) Lift the left side of the heat exchanger.
(10) Remove the line flow fan.
Photo 6
Screws fixing
the left side
of the heat
exchanger
Photo 7
Water cut
Photo 8
Hole
cover
Screws of the motor bed
46
Screws
of the
vane
motor
47
TM
HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
Copyright 2007 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD
Distributed in Aug. 2008. No. OBH481 REVISED EDITION-A 6
Distributed in Mar. 2007. No. OBH481
Made in Japan
New publication, effective Aug. 2008
Specifications subject to change without notice.