Mitsubishi MSZ-GE06NA, MSY-GE09NA, MSY-GE12NA, MSY-GE15NA, MSY-GE18NA Service Manual

SPLIT-TYPE AIR CONDITIONERS

INDOOR UNIT

SERVICE MANUAL

Models

MSZ-GE06NA
MSZ-GE09NA
MSZ-GE12NA
MSZ-GE15NA
MSZ-GE18NA

MSZ-GE06NA­MSZ-GE09NA­MSZ-GE12NA­MSZ-GE15NA­MSZ-GE18NA-

8,9
8,9
8,9
8,9
8,9

Revision D:

• MSZ-GE06/09/12/15/18NA-9 and MSY­GE09/12/15/18NA-

Please void OBH548 REVISED EDITION-C

9

have been added.

No. OBH548

REVISED EDITION-D

MSZ-GE24NA
MSY-GE09NA
MSY-GE12NA
MSY-GE15NA
MSY-GE18NA
MSY-GE24NA

MSZ-GE06/09/12/15/18NA
MSY-GE09/12/15/18NA

MSY-GE09NA­MSY-GE12NA­MSY-GE15NA­MSY-GE18NA-

CONTENTS

1. TECHNICAL CHANGES

2. PART NAMES AND FUNCTIONS ·····················3

3. SPECIFICATION ················································ 5

4. OUTLINES AND DIMENSIONS ························7

5. WIRING DIAGRAM ············································9

6. REFRIGERANT SYSTEM DIAGRAM ············· 11

7. SERVICE FUNCTIONS ···································12

8. MICROPROCESSOR CONTROL ···················14

9. TROUBLESHOOTING ·····································21

10. DISASSEMBLY INSTRUCTIONS ···················· 40

8,9
8,9
8,9
8,9

Outdoor unit service manual

MUZ-GE•NA MUY-GE•NA

Series (OBH549)

MXZ-B·NA Series (OB444)

·······································

2

NOTE:

RoHS compliant products have <G> mark on the spec name plate.

PARTS CATALOG (OBB548)

Use the specifi ed refrigerant only

OBH548D

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by
failure to follow the instructions.

Revision A:

• MSZ-GE24NA and MSY-GE24NA have been added.

Revision B:

• MSZ-GE06/09/12/15/18NA-8 and MSY-GE09/12/15/18NA-8 have been added.

Revision C:

• Specification has been corrected.

2.7

pt./h

5.1

The value of "Moisture removal" for MSZ-GE24NA and MSY-GE24NA has been corrected. [

Revision D:

• MSZ-GE06/09/12/15/18NA-9 and MSY-GE09/12/15/18NA-9 have been added.

pt./h]

1

TECHNICAL CHANGES

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA MSZ-GE24NA
MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA MSY-GE24NA

1. New model

MSZ-GE06NA
MSZ-GE09NA
MSZ-GE12NA
MSZ-GE15NA
MSZ-GE18NA
MSY-GE09NA
MSY-GE12NA
MSY-GE15NA
MSY-GE18NA

1. These models have been modified to be compatible with Honeywell remote controller.

2. Indoor electronic control P.C. board has been changed.

MSZ-GE06NA ­MSZ-GE09NA ­MSZ-GE12NA ­MSZ-GE15NA ­MSZ-GE18NA ­MSY-GE09NA ­MSY-GE12NA ­MSY-GE15NA ­MSY-GE18NA -

MSZ-GE06NA ­MSZ-GE09NA ­MSZ-GE12NA ­MSZ-GE15NA ­MSZ-GE18NA ­MSY-GE09NA ­MSY-GE12NA ­MSY-GE15NA ­MSY-GE18NA -

8
8
8
8
8
8
8
8
8

MSZ-GE06NA ­MSZ-GE09NA ­MSZ-GE12NA ­MSZ-GE15NA ­MSZ-GE18NA ­MSY-GE09NA ­MSY-GE12NA ­MSY-GE15NA ­MSY-GE18NA -

8
8
8
8
8
8
8
8
8

9
9
9
9
9
9
9
9
9

1. Model name has been changed.

2. New service parts numbers (Refer to OBB548 1-9 to 1-12.)

2

Remote controller

Operation indicator lamp

Remote control receiving section

Emergency operation switch (E.O. SW)

Horizontal vane

Air outlet

Air ¿ lter
[Catechin air ¿ lter

(GENA)

]

Air inlet

Heat exchanger

Front panel

Air cleaning ¿ lter
(Anti-Allergy Enzyme
Filter)

[Nano platinum ¿ lter

(GENA-

8 ,

- 9 )

]

Display section

2

OBH548D

PART NAMES AND FUNCTIONS

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA
MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA

ACCESSORIES

Installation plate 1
Installation plate fi xing screw 4 × 25 mm 5
Remote controller holder 1
Fixing screw for 3.5 × 16 mm (Black) 2
Battery (AAA) for remote controller 2
Wireless remote controller 1
Felt tape (Used for left or left-rear piping) 1

3

MSZ-GE24NA

OBH548D

MSY-GE24NA

Air fi lter
(Nano platinum filter)

Air cleaning filter
(Electrostatic anti-allergy
enzyme filter)

Front panel

Air inlet

Air outlet

ACCESSORIES

Remote controller

Heat exchanger

Horizontal vane

Display section

Installation plate 1
Installation plate fi xing screw 4 × 25 mm 7
Remote controller holder 1
Fixing screw for 3.5 × 16 mm (Black) 2
Battery (AAA) for remote controller 2
Wireless remote controller 1
Felt tape (Used for left or left-rear piping) 1
Air cleaning fi lter 2

4

3

OBH548D

SPECIFICATION

Indoor model MSZ-GE06NA

Power supply V, phase, Hz 208/230, 1, 60
Max. fuse size (time delay)/ Disconnect switch
Min. circuit ampacity A 1.0
Fan motor F.L.A 0.76

Airfl ow
Super High - High - Med. ­Low - Quiet

Moisture removal pt./h – 1.5 2.5
Sound level

Super High - High - Med. ­Low - Quiet

Cond. drain connection O.D. in. 5/8

Dimensions

Weight Ib. 22
External fi nish Munsell 1.0Y 9.2/0.2
Control voltage (by built-in transformer) 12 - 24 VDC

Indoor model

Power supply V, phase, Hz 208/230, 1, 60
Max. fuse size (time delay)/ Disconnect switch
Min. circuit ampacity A 1.0
Fan motor F.L.A 0.76
Airfl ow

Super High - High - Med. ­Low - Quiet (GE15/18)
Powerful - High - Med - Low
(GE24)

Moisture removal pt./h 2.7 4.6 5.1
Sound level

Super High - High - Med. ­Low - Quiet (GE15/18)
Powerful - High - Med - Low
(GE24)

Cond. drain connection O.D. in. 5/8

Dimensions

Weight Ib. 22 37
External fi nish Munsell 1.0Y 9.2/0.2
Control voltage (by built-in transformer) 12 - 24 VDC

NOTE: Test conditions are based on AHRI 210/240.

COOL Dry

HEAT Dry CFM 406-321-233-170-145 406-321-237-170-145

Cooling dB(A)

Heating dB(A) 43-37-30-22-19

W
D 9-1/8
H 11-5/8

COOL Dry

HEAT Dry CFM 463-367-304-247-205 512-431-339-275-230 738-628-469-388

Cooling dB(A) 49-44-38-32-26 49-44-38-33-28

Heating dB(A) 46-40-35-30-26 49-43-38-33-28

W
D 9-1/8 9-3/8
H 11-5/8 12-13/16

A15

CFM

(Wet)

43-37-30-22-19

in.

MSZ-GE15NA
MSY-GE15NA

A15 20

(Wet)

CFM

in.

533-420-335-272-205

(498-385-300-237-170)

31-7/16 43-5/16

MSZ-GE09NA
MSY-GE09NA

399-321-237-170-145

(364-286-201-134-109)

31-7/16

MSZ-GE18NA
MSY-GE18NA

533-420-339-275-230

( 498-385-304-240-194)

MSZ-GE12NA
MSY-GE12NA

45-37-30-22-19

MSZ-GE24NA
MSY-GE24NA

738-628-469-388

(661-562-420-347)

53-49-41-34

52-49-41-32

5

3-1. OPERATING RANGE

OBH548D

(1) POWER SUPPLY

Rated voltage Guaranteed voltage (V)

Min. 187

Indoor unit

208/230 V

1 phase

60 Hz

(2) OPERATION

Mode Condition

Standard temperature 80 67 95 —

Cooling

Heating

Maximum temperature 90 73 115 —
Minimum temperature 67 57 14 —
Maximum humidity 78% —
Standard temperature 70 60 47 43
Maximum temperature 80 67 75 65
Minimum temperature 70 60 -4 -5

3-2. OUTLET AIR SPEED AND COVERAGE

Model Mode Function

HEAT Dry 406 20.6 29.5

MSZ-GE06NA

MSZ-GE09NA
MSY-GE09NA

MSZ-GE12NA
MSY-GE12NA

MSZ-GE15NA
MSY-GE15NA

MSZ-GE18NA
MSY-GE18NA

MSZ-GE24NA
MSY-GE24NA

COOL

HEAT Dry 406 20.6 29.5

COOL

HEAT Dry 406 20.6 29.5

COOL

HEAT Dry 463 23.4 33.5

COOL

HEAT Dry 512 25.9 36.9

COOL

HEAT Dry 738 18.0 36.9

COOL

Dry 321 16.3 23.5

Wet 286 14.5 21.0

Dry 321 16.3 23.5

Wet 286 14.5 21.0

Dry 321 16.3 23.5

Wet 286 14.5 21.0

Dry 420 21.3 30.5

Wet 385 19.5 28.0

Dry 420 21.3 30.5

Wet 385 19.5 28.0

Dry 738 18.0 36.9

Wet 661 16.1 33.2

Airfl ow

(CFM)

208 230 Max. 253

Intake air temperature (°F)

Indoor Outdoor

DB WB DB WB

Air speed

(ft./s.)

Coverage

● The air coverage is the figure up to the

(ft.)

position where the air speed is 1 ft./s.,
when air is blown out horizontally from
the unit properly at the High speed posi­tion.

The coverage should be used only as a

general guideline since it varies accord­ing to the size of the room and furniture
arranged inside the room.

6

4

OBH548D

OUTLINES AND DIMENSIONS

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA
MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA

MSZ-GE06NA- 8 MSZ-GE09NA- 8 MSZ-GE12NA- 8 MSZ-GE15NA­MSY-GE09NA-

3/16

2-3/4

1-3/4

2- 5/16

9-1/8

2-3/16

6 - 1/4

8

MSY-GE12NA- 8 MSY-GE15NA- 8 MSY-GE18NA-

3/4

11-5/8

1-11/16

2-3/16

7/16×1 Oblong hole

Installation plate

31-7/16

30-15/16 1/4

Indoor unit

5-1/824-3/81-15/16

1-15/16

3-1/8

10

8-3/8

1-5/8

5/16

3-15/16

Air out

Insulation ø1 - 3/8 O.D

1-5/8

Liquid line ø1/4 19 - 11/16 (Flared connection ø1/4)
Gas line ø3/8 16 - 15/16

Piping

Drain hose Insulation ø1-1/8 O.D Connected part ø5/8 O.D

13-5/162-3/8

Air in

(Flared connection: ø3/8 (GE06/09/12NA), ø1/2 (GE15/18NA))

8

MSZ-GE18NA- 8

8

8-7/8 8-7/8

6-1/8 6-1/8

Installation plate

1-5/8

4/3/16

4-3/8

13-9/16 2-1/8

Piping

2-3/16

7/16×13/16 Oblong hole

3-1/8

Wall hole ø2-9/16

Drain hose

2-11/16

Unit: inch

7/8

9-15/16

9-1/8

8-5/16

1/8

1-5/8

MSZ-GE06NA- 9 MSZ-GE09NA- 9 MSZ-GE12NA- 9 MSZ-GE15NA­MSY-GE09NA- 9 MSY-GE12NA- 9 MSY-GE15NA- 9 MSY-GE18NA-

Insulation ø1 - 3/8 O.D
Liquid line ø1/4 19 - 11/16 (Flared connection ø1/4)
Gas line ø3/8 16 - 15/16

Piping

Drain hose Insulation ø1-1/8 O.D Connected part ø5/8 O.D

(Flared connection: ø3/8 (GE06/09/12NA), ø1/2 (GE15/18NA))

9

MSZ-GE18NA- 9

9

7

MSZ-GE24NA

OBH548D

MSY-GE24NA

43-5/16

42-7/8 3/16

Installation plate

7/16×1 Oblong hole

5-1/16

8-7/8 8-7/8

7/16×3/4 Oblong hole

4-5/16

27/32

3/16

2-9/16

2-5/16

6-1/4

9-3/8

2-1/2

8-1/4

3 33-1/8 7-1/8

3/4

2-1/2

2-9/16

Indoor unit

1-3/16

2-9/16

9-7/16

11-1/16

1-3/4

1-15/16 19-3/4 17-5/16

Air in

12-13/16

1/2

3-15/16

(

70°

)

4-7/8

Air out

2-1/2

6-5/16
7-1/4

Insulation Ø2 O.D

Liquid line Ø3/8 19-11/16 (Flared connection Ø3/8)

Piping

Gas line Ø1/2 16-15/16 (Flared connection Ø5/8)

Drain hose

Insulation Ø1-1/8 Connected part Ø5/8 O.D

7-27/327-27/32

Installation plate

Piping

2-5/8

2-9/16

1/8

Drain hose

4-3/8

Wall hole Ø3

1/8

11

10-3/16

1-3/4 9-3/8

8

5

OBH548D

WIRING DIAGRAM

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA
MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA

MSZ-GE06NA- 8 MSZ-GE09NA- 8 MSZ-GE12NA- 8 MSZ-GE15NA­MSY-GE09NA- 8 MSY-GE12NA- 8 MSY-GE15NA- 8 MSY-GE18NA-

8

MSZ-GE18NA- 8

8

9

MSZ-GE06NA- 9 MSZ-GE09NA- 9 MSZ-GE12NA- 9 MSZ-GE15NA-

OBH548D

9

MSY-GE09NA-

MSY-GE12NA- 9 MSY-GE15NA- 9 MSY-GE18NA-

MSZ-GE24NA
MSY-GE24NA

9

MSZ-GE18NA- 9

9

10

6

OBH548D

REFRIGERANT SYSTEM DIAGRAM

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA
MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA

Refrigerant pipe ø3/8 (MSZ-GE06/09/12NA, MSY-GE09/12NA)
ø1/2 (MSZ-GE15/18NA, MSY-GE15/18NA)
(with heat insulator)

Indoor
heat
exchanger

Room temperature
thermistor
RT11

Indoor coil
thermistor
RT12 (main)

Indoor coil
thermistor
RT13 (sub)

Flared connection

Flared connection

Refrigerant pipe ø1/4
(with heat insulator)

Unit: inch

MSZ-GE24NA
MSY-GE24NA

Indoor
heat
exchanger

Indoor coil
thermistor
RT13 (sub)

Room temperature
thermistor
RT11

Indoor coil
thermistor
RT12 (main)

Refrigerant flow in cooling
Refrigerant flow in heating

Refrigerant pipe ø5/8
(with heat insulator)

Flared connection

Flared connection

Refrigerant pipe ø3/8
(with heat insulator)

Refrigerant flow in cooling
Refrigerant flow in heating

11

7

OBH548D

SERVICE FUNCTIONS

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA MSZ-GE24NA
MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA MSY-GE24NA

7-1. TIMER SHORT MODE

For service, the set time can be shortened by bridging of JPG and JPS the indoor electronic control P.C. board.
The time will be shortened as follows. (Refer to 9-7.)

• The set time for the ON/OFF timer can be reduced to 1 second for each minutes.

• After the breaker is turned on, the time for starting the compressor, which normally takes 3 minuets, can be reduced to
3 seconds. Restarting the compressor, which takes 3 minuets, cannot be reduced.

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 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 modifi cation 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 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 been restored.

12

7-3. AUTO RESTART FUNCTION

OBH548D

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. “AUTO RESTART FUNCTION” automatically starts operation
in the same mode just before the shut-off of the main power.

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 disable “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.)

JR07

MSZ-GE06/09/12/15/18NA
MSY-GE09/12/15/18NA

Indoor electronic
control P.C. board

CN111CN112CN151CN10A

MSZ-GE24NA
MSY-GE24NA

CN112

CN 111

CN152

CN151

CN10A

JR07

Indoor electronic
control P.C. board

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.

13

8

Signal transmitting section

Operation display section

Indication of
remote controller
model is on back

Temperature buttons

VANE CONTROL button
(Horizontal vane button)

WIDE VANE button

(Vertical vane button)

ON TIMER button

CLOCK SET button

TIME SET buttons
FORWARD button
BACKWARD button

OFF TIMER button

RESET button

POWERFUL button

OPERATE/STOP
(ON/OFF) button

FAN SPEED CONTROL button

OPERATION SELECT button

ECONO COOL button

OBH548D

MICROPROCESSOR CONTROL

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA MSZ-GE24NA
MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA MSY-GE24NA

WIRELESS REMOTE CONTROLLER

E.g.: MSZ type

MSZ-GE06NA MSZ-GE09NA MSZ-GE12NA MSZ-GE15NA MSZ-GE18NA
MSY-GE09NA MSY-GE12NA MSY-GE15NA MSY-GE18NA

Signal transmitting section

Operation display section

OPERATE/STOP
(ON/OFF) button

Temperature buttons

FAN SPEED CONTROL button

OPERATION SELECT button

ECONO COOL button

VANE CONTROL button

SMART SET button

RESET button

Indication of
remote controller
model is on back

OFF TIMER button

ON TIMER button

TIME SET buttons
FORWARD button
BACKWARD button

CLOCK SET button

MSZ-GE24NA
MSY-GE24NA

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.

14

INDOOR UNIT DISPLAY SECTION

OBH548D

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 indication.

Indication Operation state Room temperature

The unit is operating to
reach the set temperature

The room temperature is
approaching the set tem­perature

Standby mode
(Only during multi system
operation)

8-1. COOL (

(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

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.

2. Low outside temperature operation

When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.

) OPERATION

About 4°F(2°C) or more
away from set tempera­ture

About 2 to 4°F(1 to 2°C)
from set temperature

-

Lighted

Blinking

Not lighted

8-2. DRY (

(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 works the same way as that in the COOL mode. (8-1.1.)

2. Low outside temperature operation

Low outside temperature operation works the same way as that in the COOL mode. (8-1.2.)

) OPERATION

15