Mitsubishi Electric MSZ-HE09NA, MSZ-HE12NA, MSZ-HE15NA, MSZ-HE18NA, MSZ-HE24NA Service Manual
SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
Models
MSZ-HE09NA
MSZ-HE12NA
MSZ-HE15NA
MSZ-HE18NA
MSZ-HE24NA
No. OBH685
MSZ-HE09NA
MSZ-HE12NA
MSZ-HE15NA
MSZ-HE18NA
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
Outdoor unit service manual
MUZ-HE•NA Series (OBH686)
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 ···················· 32
PARTS CATALOG (OBB685)
·······································
2
Use the specifi ed refrigerant only
OBH685
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.
1
TECHNICAL CHANGES
MSZ-HE09NA
MSZ-HE12NA
MSZ-HE15NA
MSZ-HE18NA
MSZ-HE24NA
1. New model
2
2
OBH685
PART NAMES AND FUNCTIONS
MSZ-HE09NA MSZ-HE12NA MSZ-HE15NA MSZ-HE18NA
Air filter
Air cleaning filter
(Anti-Allergy Enzyme
Filter, optioin)
Air inlet
Front panel
Heat exchanger
Air outlet
Horizontal vane
Display section
Remote control receiving section
Operation indicator lamp
Emergency operation switch (E.O. SW)
Remote controller
3
MSZ-HE24NA
OBH685
Air cleaning filter
(Electrostatic anti-allergy
enzyme filter, option)
Front panel
Air filter
Air inlet
Air outlet
Heat exchanger
Horizontal vane
Display section
ACCESSORIES
Model MSZ-HE09/12/15/18NA MSZ-HE24NA
Installation plate 1 1
Attachment screws for the installation plate
4 × 25 mm
Battery (AAA) for the remote controller 2 2
Wireless remote controller 1 1
Felt tape (For left or left-rear piping) 1 1
Air cleaning fi lter 2 2
57
Remote controller
4
3
OBH685
Indoor model MSZ-HE09NA MSZ-HE12NA
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
Moisture removal pt./h 1.5 2.5
Sound level
Super High - High - Med. Low
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
SPECIFICATION
COOL Dry
(Wet)
HEAT Dry CFM 406-321-237-170
Cooling dB(A) 43-37-30-22 45-37-30-22
Heating dB(A) 43-37-30-22
W
D 9-1/8
H 11-5/8
A15
CFM
in.
399-321-237-170
(364-286-201-134)
31-7/16
Indoor model MSZ-HE15NA MSZ-HE18NA MSZ-HE24NA
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
Moisture removal pt./h 2.7 4.6 5.1
Sound level
Super High - High - Med. Low
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 463-367-304-247 512-431-339-275 629-544-470-360
Cooling dB(A) 49-44-38-32 49-44-38-33
Heating dB(A) 46-40-35-30 48-43-38-33
W
D 9-1/8 9-3/8
H 11-5/8 12-13/16
A15 20
(Wet)
CFM
in.
533-420-335-272
(498-385-300-237)
31-7/16 43-5/16
533-420-339-275
(498-385-304-240)
629-544-470-388
(562-486-420-347)
49-45-41-34
49-45-41-32
5
3-1. OPERATING RANGE
OBH685
(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-HE09NA
MSZ-HE12NA
MSZ-HE15NA
MSZ-HE18NA
MSZ-HE24NA
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 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
Indoor Outdoor
DB WB DB WB
Air speed
(ft./s.)
Max. 253
Intake air temperature (°F)
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
OBH685
OUTLINES AND DIMENSIONS
MSZ-HE09NA MSZ-HE12NA MSZ-HE15NA MSZ-HE18NA
3/16
2-3/4
1-3/4
2-1/4 23/32
5-1/2
9-1/8
2-3/16
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
Unit: inch
7/16×13/16 Oblong hole
8-7/8 8-7/8
6-1/8 6-1/8
13-5/162-3/8
13-9/16 2-1/8
Air in
Installation plate
Piping
1-5/8
2-11/16
4/3/16
4-3/8
(Flared connection: ø3/8 (HE09/12NA), ø1/2 (HE15/18NA))
2-3/16
3-1/8
Wall hole ø2-9/16
Drain hose
8-5/16
1/8
1-5/8
7/8
9-1/8
9-15/16
MSZ-HE24NA
9-3/8
3/16
2-9/16
2-1/2
2-1/4 23/32
5-1/2
43-5/16
42-7/8 3/16
8-1/4
3 33-1/8 7-1/8
2-1/2
2-9/16
Installation plate
Indoor unit
1-3/16
2-9/16
7/16×1 Oblong hole
5-1/16
9-7/16
11-1/16
1-3/4
1-15/16 19-3/4 17-5/16
Air in
12-13/16
8-7/8 8-7/8
7-27/327-27/32
Installation plate
Piping
2-5/8
1/2
3-15/16
Air out
(
70°
)
4-7/8
6-5/16
7-1/4
2-9/16
1/8
Drain hose
2-1/2
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
7/16×3/4 Oblong hole
4-5/16
27/32
11
10-3/16
1/8
1-3/4 9-3/8
4-3/8
Wall hole Ø3
7
5
OBH685
MSZ-HE09NA MSZ-HE12NA MSZ-HE15NA MSZ-HE18NA
MSZ-HE24NA
WIRING DIAGRAM
8
6
OBH685
REFRIGERANT SYSTEM DIAGRAM
MSZ-HE09NA MSZ-HE12NA MSZ-HE15NA MSZ-HE18NA
Refrigerant pipe ø3/8 (MSZ-HE09/12NA)
ø1/2 (MSZ-HE15/18NA)
(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-HE24NA
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
9
7
OBH685
SERVICE FUNCTIONS
MSZ-HE09NA MSZ-HE12NA MSZ-HE15NA MSZ-HE18NA MSZ-HE24NA
7-1. TIMER SHORT MODE
For service, the following set time can be shortened by bridging JPG and JPS on the indoor electronic control P.C. board.
(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. 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:
J2
J1
NOTE : For modification, take out
the batteries and press
the OPERATE/STOP (ON/
OFF) button 2 or 3 times at
first.
After finish modification,
put back the batteries then
press the RESET button.
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 restored.
10
7-3. AUTO RESTART FUNCTION
OBH685
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.)
MSZ-HE24NAMSZ-HE09/12/15/18NA
JR07
Indoor electronic
control P.C. board
CN111CN112CN151CN10A
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.
11
8
OBH685
MICROPROCESSOR CONTROL
MSZ-HE09NA MSZ-HE12NA MSZ-HE15NA MSZ-HE18NA MSZ-HE24NA
WIRELESS REMOTE CONTROLLER
Signal transmitting section
Operation display section
ON/OFF (operate/stop) 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
The room temperature is
approaching the set temperature
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
8-1. 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
12
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