Mitsubishi Electric MSZ-HE09NA User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES······································· 2
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
No. OBH685
SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
Outdoor unit service manual
MUZ-HE•NA Series (OBH686)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
PARTS CATALOG (OBB685)
MSZ-HE09NA
MSZ-HE12NA
MSZ-HE15NA
MSZ-HE18NA
MSZ-HE24NA
Models
MSZ-HE09NA
MSZ-HE12NA
MSZ-HE15NA
MSZ-HE18NA

2
MSZ-HE09NA
MSZ-HE12NA
MSZ-HE15NA
MSZ-HE18NA
MSZ-HE24NA
1. New model
1TECHNICAL CHANGES
Use the specified 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.
OBH685

3
MSZ-HE09NA MSZ-HE12NA MSZ-HE15NA MSZ-HE18NA
Remote controller
Operation indicator lamp
Remote control receiving section
Emergency operation switch (E.O. SW)
Horizontal vane
Air outlet
Air filter
Air inlet
Heat exchanger
Front panel
Air cleaning filter
(Anti-Allergy Enzyme
Filter, optioin)
Display section
2PART NAMES AND FUNCTIONS
OBH685

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Remote controller
Display section
Front panel
Air filter
Air inlet
Air cleaning filter
(Electrostatic anti-allergy
enzyme filter, option)
Air outlet
Horizontal vane
Heat exchanger
MSZ-HE24NA
ACCESSORIES
Model MSZ-HE09/12/15/18NA MSZ-HE24NA
Installation plate 1 1
Attachment screws for the installation plate
4 × 25 mm 57
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 filter 2 2
OBH685

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Indoor model MSZ-HE09NA MSZ-HE12NA
Power supply V, phase, Hz 208/230, 1, 60
Max. fuse size (time delay)/ Disconnect switch A15
Min. circuit ampacity A 1.0
Fan motor F.L.A 0.76
Airflow
Super High - High - Med. -
Low
COOL Dry
(Wet)
CFM 399-321-237-170
(364-286-201-134)
HEAT Dry CFM 406-321-237-170
Moisture removal pt./h 1.5 2.5
Sound level
Super High - High - Med. -
Low
Cooling dB(A) 43-37-30-22 45-37-30-22
Heating dB(A) 43-37-30-22
Cond. drain connection O.D. in. 5/8
Dimensions
W
in.
31-7/16
D 9-1/8
H 11-5/8
Weight Ib. 22
External finish Munsell 1.0Y 9.2/0.2
Control voltage (by built-in transformer) 12 - 24 VDC
Indoor model MSZ-HE15NA MSZ-HE18NA MSZ-HE24NA
Power supply V, phase, Hz 208/230, 1, 60
Max. fuse size (time delay)/ Disconnect switch A15 20
Min. circuit ampacity A 1.0
Fan motor F.L.A 0.76
Airflow
Super High - High - Med. -
Low
COOL Dry
(Wet)
CFM 533-420-335-272
(498-385-300-237)
533-420-339-275
(498-385-304-240)
629-544-470-388
(562-486-420-347)
HEAT Dry CFM 463-367-304-247 512-431-339-275 629-544-470-360
Moisture removal pt./h 2.7 4.6 5.1
Sound level
Super High - High - Med. -
Low
Cooling dB(A) 49-44-38-32 49-44-38-33 49-45-41-34
Heating dB(A) 46-40-35-30 48-43-38-33 49-45-41-32
Cond. drain connection O.D. in. 5/8
Dimensions
W
in.
31-7/16 43-5/16
D 9-1/8 9-3/8
H 11-5/8 12-13/16
Weight Ib. 22 37
External finish 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.
3SPECIFICATION
OBH685

6
3-2. OUTLET AIR SPEED AND COVERAGE
●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 posi-
tion.
The coverage should be used only as a
general guideline since it varies accord-
ing to the size of the room and furniture
arranged inside the room.
(2) OPERATION
Mode Condition
Intake air temperature (°F)
Indoor Outdoor
DB WB DB WB
Cooling
Standard temperature 80 67 95 —
Maximum temperature 90 73 115 —
Minimum temperature 67 57 14 —
Maximum humidity 78% —
Heating
Standard temperature 70 60 47 43
Maximum temperature 80 67 75 65
Minimum temperature 70 60 -4 -5
3-1. OPERATING RANGE
(1) POWER SUPPLY
Rated voltage Guaranteed voltage (V)
Indoor unit
208/230 V
1 phase
60 Hz
Min. 187 208 230 Max. 253
Model Mode Function Airflow
(CFM)
Air speed
(ft./s.)
Coverage (ft.)
MSZ-HE09NA
HEAT Dry 406 20.6 29.5
COOL Dry 321 16.3 23.5
Wet 286 14.5 21.0
MSZ-HE12NA
HEAT Dry 406 20.6 29.5
COOL Dry 321 16.3 23.5
Wet 286 14.5 21.0
MSZ-HE15NA
HEAT Dry 463 23.4 33.5
COOL Dry 420 21.3 30.5
Wet 385 19.5 28.0
MSZ-HE18NA
HEAT Dry 512 25.9 36.9
COOL Dry 420 21.3 30.5
Wet 385 19.5 28.0
MSZ-HE24NA
HEAT Dry 738 18.0 36.9
COOL Dry 738 18.0 36.9
Wet 661 16.1 33.2
OBH685

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Unit: inch
MSZ-HE09NA MSZ-HE12NA MSZ-HE15NA MSZ-HE18NA
8-5/16
9-1/8
9-15/16
7/8
6-1/8 6-1/8
3-1/8
3-1/8 8-7/8 8-7/8
1/8
3/16
9-1/8
2-3/16 2-3/4
31-7/16
30-15/16 1/4
5-1/824-3/81-15/16
11-5/8
1-15/16
1-5/8
2-3/16
1-11/16
1-5/8
5/16
3-15/16
4/3/16
4-3/8
1-3/4
2-3/16
2-11/16
13-5/162-3/8
8-3/8
10
1-5/8
1-5/8
13-9/16 2-1/8
7/16×1 Oblong hole 7/16×13/16 Oblong hole
Installation plate
Indoor unit Wall hole ø2-9/16
Air in
Air out
Installation plate
Piping
Drain hose
5-1/2
2-1/4 23/32
Piping
Insulation ø1 - 3/8 O.D
Liquid line ø1/4 19 - 11/16 (Flared connection ø1/4)
Gas line ø3/8 16 - 15/16
(Flared connection: ø3/8 (HE09/12NA), ø1/2 (HE15/18NA))
Drain hose Insulation ø1-1/8 O.D Connected part ø5/8 O.D
4OUTLINES AND DIMENSIONS
MSZ-HE24NA
42-7/8 3/16
43-5/16
1-3/4 9-3/8
10-3/16
1/8
11
8-7/8 8-7/8
5-1/16
9-7/16
11-1/16
1-3/4
1-15/16 19-3/4 17-5/16
7-27/327-27/32
4-3/8
2-9/16
2-1/2
3 33-1/8 7-1/8
2-9/16
2-9/16
1-3/16
2-1/2
2-9/16
2-5/8
2-1/2
12-13/16
1/8
3-15/16
4-7/8
6-5/16
4-5/16
( 70° )
9-3/8
3/16
8-1/4
27/32
7-1/4
1/2
Piping
Insulation Ø2 O.D
Liquid line Ø3/8 19-11/16 (Flared connection Ø3/8)
Gas line Ø1/2 16-15/16 (Flared connection Ø5/8)
Drain hose Insulation Ø1-1/8 Connected part Ø5/8 O.D
Air out
Piping
Drain hose
7/16×1 Oblong hole 7/16×3/4 Oblong hole
Installation plate
Indoor unit
Wall hole Ø 3
Air in Installation plate
5-1/2
2-1/4 23/32
OBH685

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MSZ-HE09NA MSZ-HE12NA MSZ-HE15NA MSZ-HE18NA
5WIRING DIAGRAM
MSZ-HE24NA
OBH685

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MSZ-HE09NA MSZ-HE12NA MSZ-HE15NA MSZ-HE18NA Unit: inch
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø3/8 (MSZ-HE09/12NA)
ø1/2 (MSZ-HE15/18NA)
(with heat insulator)
Refrigerant pipe ø1/4
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Refrigerant flow in cooling
Refrigerant flow in heating
6REFRIGERANT SYSTEM DIAGRAM
MSZ-HE24NA
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø5/8
(with heat insulator)
Refrigerant pipe ø3/8
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Refrigerant flow in cooling
Refrigerant flow in heating
OBH685

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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:
MSZ-HE09NA MSZ-HE12NA MSZ-HE15NA MSZ-HE18NA MSZ-HE24NA
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 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.
7SERVICE FUNCTIONS
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.
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.
J2
J1
OBH685