Mitsubishi Electric MSZ-HM09NA-U1, MSZ-HM24NA-U1, MSZ-HM12NA-U1, MSZ-HM15NA-U1, MSZ-HM18NA-U1 Service Manual
INDOOR UNIT
INDOOR UNIT
SERVICE MANUAL
Models
U1
MSZ-HM09NA
MSZ-HM12NA
-
U1
-
Revision B:
• 3-1. OPERATING RANGE has been modified.
Please void OBH746 REVISED EDITION-A.
No. OBH746
REVISED EDITION-B
MSZ-HM15NA
MSZ-HM18NA
MSZ-HM24NA
MSZ-HM24NA
U1
-
U1
-
U1
-
Outdoor unit service manual
MUZ-HM•NA Series (OBH747)
CONTENTS
1. TECHNICAL CHANGES
2. PART NAMES AND FUNCTIONS ·····················3
3. SPECIFICATION ················································ 5
4. OUTLINES AND DIMENSIONS ························7
5. WIRING DIAGRAM ············································8
6. REFRIGERANT SYSTEM DIAGRAM ···············9
7. SERVICE FUNCTIONS ··································· 10
8. MICROPROCESSOR CONTROL ··················· 12
9. TROUBLESHOOTING ·····································16
10. DISASSEMBLY INSTRUCTIONS ····················30
·······································
2
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
PARTS CATALOG (OBB746)
Use the speci¿ ed refrigerant only
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-HM09/12/15/18NA-U1 have been added.
Revision B:
• 3-1. OPERATING RANGE has been modified.
1
TECHNICAL CHANGES
MSZ-HM24NA
1. New model
MSZ-HM09NA
MSZ-HM12NA
MSZ-HM15NA
MSZ-HM18NA
1. New model
U1
-
U1
-
U1
-
U1
-
U1
-
OBH746B
2
2
PART NAMES AND FUNCTIONS
MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA
Air ¿ lter
Air cleaning ¿ lter
(Anti-Allergy Enzyme
Filter, option)
Air inlet
Air outlet
Horizontal vane
Display section
Remote control receiving section
Front panel
Heat exchanger
Remote controller
ACCESSORIES
Installation plate 1
Attachment screws for the installation plate
4 × 25 mm
Battery (AAA) for remote controller 2
Wireless remote controller 1
Felt tape (For left or left-rear piping) 1
Operation indicator lamp
Emergency operation switch
5
OBH746B
3
MSZ-HM18NA MSZ-HM24NA
Front panel
Air ¿ lter
Air inlet
Air cleaning ¿ lter
(Anti-Allergy Enzyme
Filter, option)
ACCESSORIES
Installation plate 1
Attachment screws for the installation
plate 4 × 25 mm
Wireless remote controller 1
Felt tape (For left or left-rear piping) 1
Battery (AAA) for remote controller 2
Heat exchanger
Air outlet
Horizontal vane
Remote controller
Display section
Remote control receiving section
Operation indicator lamp
Emergency operation switch
5
OBH746B
4
3
Indoor model MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA
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
AirÀ ow
Super High - High - Med. Low
Moisture removal pt./h 1.5 2.5 2.7
Sound level
Super High - High - Med. Low
Fan speed
Super High - High - Med. Low
Cond. drain connection O.D. in. 5/8
Dimensions
Weight Ib. 22
External ¿ 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.
SPECIFICATION
COOL Dry
(Wet)
HEAT Dry CFM 406 - 321 - 237 - 170 463 - 367 - 304 - 247
Cooling dB(A) 43 - 37 - 30 - 22 45 - 37 - 30 - 22 49 - 44 - 38 - 32
Heating dB(A) 43 - 37 - 30 - 22 46 - 40 - 35 - 30
Cooling rpm 1,020 - 860 - 670 - 530 1,280 - 1,060 - 880 - 740
Heating rpm 1,040 - 860 - 670 - 530 1,140 - 950 - 810 - 690
W
D9-1/8
H11-5/8
A15
CFM
in.
399 - 321 - 237 - 170
(364 - 286 - 201 - 134)
31-7/16
533 - 420 - 335 - 272
(498 - 385 - 300 - 237)
Indoor model MSZ-HM18NA MSZ-HM24NA
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 0.67
AirÀ ow
Super High - High - Med. Low
Moisture removal pt./h 2.1 2.3
Sound level
Super High - High - Med. Low
Fan speed
Super High - High - Med. Low
Cond. drain connection O.D. in. 5/8
Dimensions
Weight Ib. 28
External ¿ 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 625 - 530 - 431 - 307 702 - 579 - 448 - 346
Cooling dB(A) 47 - 42 - 37 - 30 50 - 44 - 38 - 33
Heating dB(A) 47 - 42 - 37 - 30 50 - 44 - 38 - 32
Cooling rpm 1,140 - 1,000 - 850 - 690 1,250 - 1,000 - 850 - 730
Heating rpm 1,140 - 1,000 - 850 - 660 1,250 - 1,070 - 880 - 720
W
D9-13/16
H12
A15
(Wet)
CFM
in.
625 - 530 - 431 - 328
(562 - 477 - 388 - 295)
36-5/16
702 - 530 - 431 - 353
(632 - 477 - 388 - 318)
OBH746B
5
3-1. OPERATING RANGE
(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(NA), 5(NA2)-5 (NA), 4 (NA2)
3-2. OUTLET AIR SPEED AND COVERAGE
Model Mode Function
HEA T Dry 406 20.6 29.5
MSZ-HM09NA
MSZ-HM12NA
MSZ-HM15NA
MSZ-HM18NA
MSZ-HM24NA
COOL
HEA T Dry 406 20.6 29.5
COOL
HEA T Dry 463 23.4 33.5
COOL
HEA T Dry 625 28.5 42.6
COOL
HEA T Dry 702 32.0 47.7
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 420 21.3 30.5
Wet 385 19.5 28.0
Dry 625 28.5 42.6
Wet 562 25.6 38.4
Dry 702 32.0 47.7
Wet 632 28.8 43.1
AirÀ ow
(CFM)
208 230 Max. 253
Intake air temperature (°F)
Indoor Outdoor
DB WB DB WB
Air speed
(ft./s.)
Coverage
(ft.)
Ɣ The air coverage is the figure up to the
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.
OBH746B
6
4
OUTLINES AND DIMENSIONS
MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA
2-1/4
5-1/2
11/16
Unit: inch
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 (HM09/12NA), ø1/2 (HM15NA))
MSZ-HM18NA MSZ-HM24NA
1/4
9-13/16
3/16
12
2-1/2
2-1/4
2-1/4
5-1/2
11/16
2-1/16
2-1/2
2-9/16
2-1/16
36-5/16
35-13/16
27-15/16
2-9/16
3-11/16
Installation plate
Indoor unit
6-5/16
3-11/16
10-3/8
8-3/4
1-5/8
2-13/16
2-5/16
1×7/16 Oblong hole
15-7/8
3-15/16
1/4
Air out
8-7/8 8-7/8
8-11/16
Air in
8-1/16
2-9/16
4-1/2
5-3/4
15-3/16
Wall hole Ø3
Installation plate
Piping
2-9/16
7/16×13/16
Oblong hole
3
Drain hose
3-11/16
8-11/16
1/8
7/8
9-7/16
10-5/16
1-11/16
MSZ-HM18NA
OBH746B
Insulation
Liquid line Ø5/16 15-3/8 (Flared connection Ø1/4)
Piping
Gas line Ø15/32 13-3/8 (Flared connection Ø1/2)
Drain hose
Ø2 O.D
Insulation Ø1-1/8 Connected part Ø5/8 O.D
MSZ-HM24NA
Insulation
Liquid line Ø5/16 15-3/8 (Flared connection Ø3/8)
Piping
Gas line Ø15/32 13-3/8 (Flared connection Ø5/8)
Drain hose
Ø2 O.D
Insulation Ø1-1/8 Connected part Ø5/8 O.D
7
5
MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA
WIRING DIAGRAM
MSZ-HM18NA MSZ-HM24NA
OBH746B
8
6
REFRIGERANT SYSTEM DIAGRAM
MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA
Refrigerant pipe ø3/8 (ø9.52) (MSZ-HM09/12NA)
ø1/2 (ø12.7) (MSZ-HM15NA)
(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 (ø6.35)
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
Unit: inch (mm)
MSZ-HM18NA MSZ-HM24NA
Refrigerant pipe ø1/2 (ø12.7) (MSZ-HM18NA)
ø5/8 (ø15.88) (MSZ-HM24NA)
(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 (ø6.35) (MSZ-HM18NA)
ø3/8 (ø9.52) (MSZ-HM24NA)
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
OBH746B
9
7
SERVICE FUNCTIONS
MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA MSZ-HM18NA MSZ-HM24NA
7-1. TIMER SHORT MODE
For service, the set time can be shortened by bridging of the timer short point on 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 minute.
• After the breaker is turned on, the time for starting the compressor, which normally takes 3 minutes, can be reduced to
3 seconds. Restarting the compressor, which takes 3 minutes, cannot be reduced.
7-2. REMOTE CONTROLLER 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, the remote controller P.C. boards 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:
J2
J1
NOTE: For modification, take out the
batteries and press the STOP/
OPERATE (OFF/ON) button 2
or 3 times at first.
After finish modification, put
back the batteries then press
the RESET button.
The remote controller 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 modi¿ 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 is turned OFF, or the power supply is shut down.
Please conduct the above setting once again after the power has been restored.
OBH746B
10
7-3. AUTO RESTART FUNCTION
When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed
are memorized by the indoor electronic control P.C. board. “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. (HM09/12/15NA)
Cut the Jumper wire JR77 on the indoor electronic control P.C. board. (HM18/24NA) (Refer to 9-7.)
MSZ-HM09/12/15NA
Indoor electronic
control P.C. board
JR07
CN111CN112
CN151
CN10A
MSZ-HM18/24NA
Indoor electronic
control P.C. board
CN151
CN112
CN110
JR77
CN10ACN111
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 turned 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 the breaker from tripping 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.
OBH746B
11
8
MICROPROCESSOR CONTROL
MSZ-HM09NA MSZ-HM12NA MSZ-HM15NA MSZ-HM18NA MSZ-HM24NA
WIRELESS REMOTE CONTROLLER
Signal transmitting section
Operation display section
OFF/ON (stop/operate) button
Fan speed control button
Operation select button
Timer mode select button
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.
Temperature buttons
ECONO COOL button
Vane control button
Time set buttons
RESET button
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 indication.
Indication Operation state Room temperature
The unit is operating to
reach the set temperature
About 4°F (2°C) or more
away from set temperature
Lighted
Blinking
Not lighted
The room temperature is
approaching the set temperature
About 2 to 4 °F (1° to 2°C)
from set temperature
8-1. COOL ( ) OPERATION
(1) Press STOP/OPERATE (OFF/ON) 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.
OBH746B
12
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