Mitsubishi Electric MSZ-FS12NA-U1 User manual

INDOOR UNIT
SERVICE MANUAL
INDOOR UNIT
Models
MSZ-FS06NA -U1
MSZ-FS09NA -U1
MSZ-FS12NA -U1
MSZ-FS15NA -U1
MSZ-FS18NA -U1
No. OBH872
PARTS CATALOG (OBB872)
Outdoor unit service manual
MUZ-FS∙NA(H) Series (OBH873)
MXZ-C∙NA,NAHZ Series (OBH702)
CONTENTS
1. TECHNICAL CHANGES ······························3
2. PART NAMES AND FUNCTIONS ··················4
3. SPECIFICATION·········································5
4. OUTLINES AND DIMENSIONS ·····················6
5. WIRING DIAGRAM ·····································7
6. REFRIGERANT SYSTEM DIAGRAM ·············8
7. SERVICE FUNCTIONS································9
8. MICROPROCESSOR CONTROL················· 11
9. TROUBLESHOOTING·······························20
10. DISASSEMBLY INSTRUCTIONS·················33

2
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.
OBH872

3
1TECHNICAL CHANGES
MSZ-FS06NA - U1
MSZ-FS09NA - U1
MSZ-FS12NA - U1
MSZ-FS15NA - U1
MSZ-FS18NA - U1
1. New model
OBH872

4
2PART NAMES AND FUNCTIONS
ACCESSORIES
Model
MSZ-FS06NA
MSZ-FS09NA
MSZ-FS12NA
MSZ-FS15NA
MSZ-FS18NA
Installation plate 1
Attachment screws for the installation
plate 4 × 25 mm 5
Remote controller holder 1
Screw for the remote controller holder
3.5 × 16 mm (Black) 2
Battery (AAA) for the remote controller 2
Wireless remote controller 1
Felt tape (For left or left-rear piping) 1
Air cleaning lter
(Electrostatic anti-allergy enzyme lter) 1
Air cleaning lter (Deodorizing lter) 1
Operation indicator lamp Remote control receiving
section
Emergency
operation
switch
Horizontal
vane
Air inlet
Air filter
(Nano platinum filter)
Air cleaning filter
(Electrostatic anti-allergy
enzyme filter and deodorizing fiter)
Front panel
Air outlet
i-see sensor
Remote controller
MSZ-FS06NA MSZ-FS09NA MSZ-FS12NA MSZ-FS15NA MSZ-FS18NA
OBH872

5
3SPECIFICATION
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
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.
(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 -13 -14
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 Airow
(CFM) Air speed (ft./s)
Coverage (ft.)
MSZ-FS06NA HEAT Dry 437 19.5 29.8
COOL Dry 381 17.0 26.1
Wet 328 14.6 22.5
MSZ-FS09NA HEAT Dry 437 19.5 29.8
COOL Dry 381 17.0 26.1
Wet 328 14.6 22.5
MSZ-FS12NA HEAT Dry 454 20.3 31.0
COOL Dry 424 19.0 29.0
Wet 364 16.2 24.8
MSZ-FS15NA HEAT Dry 514 23.0 34.9
COOL Dry 437 19.5 29.8
Wet 376 16.7 25.6
MSZ-FS18NA HEAT Dry 514 23.0 34.9
COOL Dry 437 19.5 29.8
Wet 376 16.7 25.6
Indoor unit model MSZ-FS06NA MSZ-FS09NA MSZ-FS12NA MSZ-FS15NA MSZ-FS18NA
Power supply V, phase, Hz 208/230 , 1 , 60
Disconnect switch A 15
Min. circuit ampacity A 1.0
Fan motor F.L.A 0.65
Airow
Super high - High -
Med. - Low - Quiet
COOL Dry
(Wet)
CFM
381- 304 - 221 - 167 - 137
(328 - 261 - 190 - 143 - 117)
381- 304 - 221 - 167 - 137
(328 - 261 - 190 - 143 - 117)
424 - 304 - 221 - 167 - 137
(364- 261 - 190 - 143 - 117)
437 - 355 - 304 - 262 - 225
(376 - 305 - 261 - 225 - 194)
437 - 355 - 304 - 262 - 225
(376 - 305 - 261 - 225 - 194)
HEAT Dry CFM 437 - 381 - 225 - 167 - 140 437 - 381 - 225 - 167 - 140 454 - 367 - 282 - 226 - 155 514 - 410 - 350 - 272 - 201 514 - 410 - 350 - 272 - 201
Moisture removal pt./h 0.2 0.6 1.9 4.0 5.1
Sound level
Super high - High -
Med. - Low - Quiet
Cooling dB(A) 40 - 36 - 29 - 23 - 20 40 - 36 - 29 - 23 - 20 44 - 36 - 29 - 24 - 21 44 - 39 - 35 - 31 - 27 44 - 39 - 35 - 31 - 27
Heating dB(A) 42 - 39 - 29 - 24 - 20 42 - 39 - 29 - 24 - 20 43 - 38 - 32 - 28 - 21 46 - 40 - 37 - 31 - 25 46 - 40 - 37 - 31 - 25
Cond. drain connection O.D. in. 5/8
Dimensions Win. 36-7/16 D 9-3/16
H 12 (+ 11/16)
Weight Ib. 29
External nish Munsell 1.0Y 9.2/0.2
Remote controller Wireless type
Control voltage (by built-in transformer) 12 - 24 VDC
NOTE: Test conditions are based on AHRI 210/240.
OBH872

6
4OUTLINES AND DIMENSIONS
Unit: inch
MSZ-FS06NA MSZ-FS09NA MSZ-FS12NA MSZ-FS15NA MSZ-FS18NA
(MSZ-FS06/09/12NA) (MSZ-FS15/18NA)
OBH872

7
5WIRING DIAGRAM
MSZ-FS06NA MSZ-FS09NA MSZ-FS12NA MSZ-FS15NA MSZ-FS18NA
OBH872

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6REFRIGERANT SYSTEM DIAGRAM
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø3/8 (ø9.52)
(with heat insulator)
Refrigerant pipe ø1/4 (ø6.35)
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Refrigerant flow in cooling
Refrigerant flow in heating
Unit: inch (mm)
Indoor
heat
exchanger
Flared connection
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø1/2 (ø12.7)
(with heat insulator)
Refrigerant pipe ø1/4 (ø6.35)
(with heat insulator)
Indoor coil
thermistor
RT12 (main)
Indoor coil
thermistor
RT13 (sub)
Refrigerant flow in cooling
Refrigerant flow in heating
MSZ-FS15NA MSZ-FS18NA
MSZ-FS06NA MSZ-FS09NA MSZ-FS12NA
OBH872

9
7SERVICE FUNCTIONS
7-1. TIMER SHORT MODE
For service, the following set time can be shortened by bridging JPG and JPS on the electronic control P.C. board.
(Refer to 9-7.)
Set time: 3 minutes → 3 seconds (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by bridging JPG and JPS.)
7-2. HOW TO SET REMOTE CONTROLLER EXCLUSIVELY FOR A PARTICULAR INDOOR UNIT
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
To operate the indoor units individually with each remote controller, assign a number to each remote controller according
to the number of the indoor unit.
This setting can be set only when all the following conditions are met:
• The remote controller is powered OFF.
• Weekly timer is not set.
• Weekly timer is not being edited.
(1) Hold down button on the remote controller for 2 seconds to enter the pairing mode.
(2) Press button again and assign a number to each remote controller.
Each press of button advances the number in the following order: 1 → 2 → 3 → 4.
(3) Press button to complete the pairing setting.
After you turn the breaker ON, the remote controller that first sends a signal to an indoor unit will be regarded as the
remote controller for the indoor unit.
Once they are set, the indoor unit will only receive the signal from the assigned remote controller afterwards.
7-3. SETTING THE INSTALLATION POSITION
Be sure to set the remote controller according to the installed position of the indoor unit.
Installation position:
Left: Distance to objects (wall, cabinet, etc.) is less than 50 cm to the left
Center: Distance to objects (wall, cabinet, etc.) is more than 50 cm to the left and right
Right: Distance to objects (wall, cabinet, etc.) is less than 50 cm to the right
The installation position can be set only when all the following conditions are met:
• The remote controller is powered OFF.
• Weekly timer is not set.
• Weekly timer is not being edited.
(1) Hold down button on the remote controller for 2 seconds to enter the position setting mode.
(2) Select the target installation position by pressing button. (Each press of the button displays the
positions in order: center → right → left.)
(3) Press button to complete the position setting.
Installation position Left Center Right
Remote controller
display
(Left)(Center)(Right)
MSZ-FS06NA MSZ-FS09NA MSZ-FS12NA MSZ-FS15NA MSZ-FS18NA
OBH872

10
7-4. 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 shutoff 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 for the unit.
Cut the jumper wire to JR77 on the indoor electronic control P.C. board. (Refer to 9-7.)
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 can-
celled.
• 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.
JR77
CN110CN151
BZ
Indoor electronic control
P.C. board
OBH872