Mitsubishi Electronics MSZ-FH06NA, MSZ-FH09NA, MSZ-FH12NA, MSZ-FH15NA, MSZ-FH18NA User Manual

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INDOOR UNIT

SERVICE MANUAL

Models

MSZ-FH06NA MSZ-FH09NA

Revision D:

• MSZ-FH06NA and MSZ-FH18NA2 have been added.

Please void OBH683 REVISED EDITION-C.

No. OBH683

REVISED EDITION-D

MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2

Outdoor unit service manual MUZ-FH·NA(H) Series (OBH684) MXZ-C•NA,NAHZ Series (OCH573)

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 ···················· 32

PARTS CATALOG (OBB683)

NOTE:

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

Use the speciﬁ ed refrigerant only

OBH683D

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:

• 3. SPECIFICATION has been modified. (The value of the disconnect switch for MSZ-FH15NA has been modified.)

• 8. MICROPROCESSOR CONTROL has been modified.

• 9. TROUBLESHOOTING has been modified.

Revision B:

• 4. OUTLINE AND DIMENSIONS has been modified. (The length of the connect pipes has been modified.)

• Some descriptions have been modified.

Revision C:

• MSZ-FH18NA has been added.

Revision D:

• MSZ-FH06NA and MSZ-FH18NA2 have been added.

OBH683D

MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA

1. New model

MSZ-FH18NA

1. New model

MSZ-FH06NA MSZ-FH18NA2

1. New model

TECHNICAL CHANGES

OBH683D

PART NAMES AND FUNCTIONS

MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2

Front panel

Air inlet

Emergency operation switch

Air ﬁlter (Nano platinum ﬁlter)

Air cleaning ﬁlter (Electrostatic anti-allergy enzyme ﬁlter and deodorizing ﬁter)

Horizontal vane

i-see SENSOR

Air outlet

Operation indicator lamp

ACCESSORIES

MSZ-FH06NA MSZ-FH09NA

Model

Installation plate 1

Attachment screws for the installation plate 4 × 25 mm

Remote controller holder 1

Screw for the remote controller holder

3.5 × 16 mm (Black)

Battery (AAA) for the remote controller 2 Wireless remote controller 1 Felt tape (For left or left-rear piping) 1 Air cleaning ﬁ lter

(Electrostatic anti-allergy enzyme ﬁ lter) Air cleaning ﬁ lter (Deodorizing ﬁ lter) 1

MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2

Remote controller

Remote control receiving section

OBH683D

SPECIFICATION

Indoor unit model Power supply V, phase, Hz 208/230 , 1 , 60 Disconnect switch A 15 Min. circuit ampacity A 1.0 Fan motor F.L.A 0.67

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

Moisture removal pt./h 0.2 0.6 1.9 4.0 5.1 4.8

Sound level Super high - High Med. - Low - Quiet

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

Dimensions

Weight Ib. 29 External ﬁ 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.

COOL Dry (Wet)

HEAT Dry CFM

Cooling dB(A)

Heating dB(A)

W D 9-3/16 H 12 (+ 11/16)

CFM

in.

MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2

381- 304 - 221 - 167 - 137

(328 - 261 - 190 - 143 - 117) 437 - 325 - 225 - 167 - 140 437 - 325 - 225 - 167 - 140 454 - 325 - 225 - 167 - 140 497 - 394 - 317 - 254 - 201 514 - 394 - 317 - 254 - 201 514 - 394 - 317 - 254 - 201

40 - 36 - 29 - 23 - 20 40 - 36 - 29 - 23 - 20 41 - 36 - 29 - 24 - 21 44 - 39 - 35 - 31 - 27 44 - 39 - 35 - 31 - 27 47 - 39 - 35 - 31 - 27

42 - 36 - 29 - 24 - 20 42 - 36 - 29 - 24 - 20 42 - 36 - 29 - 24 - 21 46 - 39 - 34 - 29 - 25 46 - 39 - 34 - 29 - 25 46 - 39 - 34 - 29 - 25

381- 304 - 221 - 167 - 137

(328 - 261 - 190 - 143 - 117)

398 - 304 - 221 - 167 - 137 (342 - 261 - 190 - 143 - 117)

411 - 355 - 304 - 262 - 225

(354 - 305 - 261 - 225 - 194)

36-7/16

437 - 355 - 304 - 262 - 225

(376 - 305 - 261 - 225 - 194)

459 - 355 - 304 - 262 - 225

(395 - 305 - 261 - 225 - 194)

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

(2) OPERATION

Intake air temperature (°F)

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 -13 -14

DB WB DB WB

Indoor Outdoor

3-2. OUTLET AIR SPEED AND COVERAGE

Model Mode Function

MSZ-FH06NA

MSZ-FH09NA

MSZ-FH12NA

MSZ-FH15NA

MSZ-FH18NA

MSZ-FH18NA2

HEAT Dry 437 19.5 29.8

COOL

HEAT Dry 437 19.5 29.8

COOL

HEAT Dry 454 20.3 31.0

COOL

HEAT Dry 497 22.2 33.8

COOL

HEAT Dry 514 23.0 34.9

COOL

HEAT Dry 514 23.0 34.9

COOL

Airﬂ ow

(CFM)

Dry 381 17.0 26.1

Wet 328 14.6 22.5

Dry 381 17.0 26.1

Wet 328 14.6 22.5

Dry 398 17.8 27.3

Wet 342 15.3 23.5

Dry 411 18.3 28.0

Wet 354 15.7 24.1

Dry 437 19.5 29.8

Wet 376 16.7 25.6

Dry 459 20.5 31.2

Wet 395 17.6 27.0

Air speed

(ft./s)

Coverage

(ft.)

● 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.

OBH683D

MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2

OUTLINES AND DIMENSIONS

Unit: inch

(MSZ-FH06/09/12NA)

(MSZ-FH15/18NA/18NA2)

OBH683D

MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2

WIRING 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

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

OBH683D

REFRIGERANT SYSTEM DIAGRAM

MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA

Unit: inch (mm)

MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2

OBH683D

SERVICE FUNCTIONS

MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2

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 (2) Press Each press of

(3) Press

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.

button on the remote controller for 2 seconds to enter the pairing mode.

button again and assign a number to each remote controller.

button advances the number in the following order: 1 → 2 → 3 → 4.

button to complete the pairing setting.

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

(2) Select the target installation position by pressing positions in order: center → right → left.)

(3) Press

button on the remote controller for 2 seconds to enter the position setting mode.

button. (Each press of the button displays the

button to complete the position setting.

(Left)(Center)(Right)

Installation position Left Center Right

Remote controller display

7-4. AUTO RESTART FUNCTION

OBH683D

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.)

Indoor electronic control P.C. board

CN110CN151

JR77

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.

OBH683D

MICROPROCESSOR CONTROL

MSZ-FH06NA MSZ-FH09NA MSZ-FH12NA MSZ-FH15NA MSZ-FH18NA MSZ-FH18NA2

WIRELESS REMOTE CONTROLLER

Signal transmitting section

Distance of signal : About 20 ft. (6 m)

Beep(s) is (are) heard from the indoor unit when the signal is received.

FAN SPEED CONTROL button

WIDE VANE button VANE CONTROL button

INDIRECT/DIRECT button

TIME, TIMER set buttons FORWARD button BACKWARD button

WEEKLY TIMER set buttons

RESET button

CLOCK button

Lid Slide the lid down to open the remote controller. Slide it down further to get to the weekly timer buttons.

Operation display section

TEMPERATURE buttons

OPERATION SELECT button

ECONO COOL button POWERFUL button

SMART SET button

NATURAL FLOW button

STOP/OPERATE (OFF/ON) button

SENSOR (i-see) button

Indication of remote controller model is on back

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.

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.

Standby mode (only during multisystem 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

8-1. COOL ( ) OPERATION

OBH683D

(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 TEMP 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.

or button to select the desired temperature.

8-2. DRY ( ) OPERATION

(1) Press STOP/OPERATE (OFF/ON) 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 COOL mode. (8-1.1.)

2. Low outside temperature operation

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

8-3. FAN ( ) OPERATION

(1) OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select FAN mode with OPERATION SELECT button.

(3) Select the desired fan speed. When AUTO, it becomes Low. Only indoor fan operates. Outdoor unit does not operate.

8-4. HEAT ( ) OPERATION

(1) Press STOP/OPERATE (OFF/ON) button.

OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select HEAT mode with OPERATION SELECT button. (3) Press TEMPERATURE buttons TEMP The setting range is 61 - 88°F (16 - 31°C).

1. Cold air prevention control

When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room temperature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.

2. High pressure protection

The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the condensing pressure from increasing excessively. When the temperature of indoor heat exchanger becomes too high, the high pressure protection works. The indoor fan operates following the cold air prevention control. This mode continues until the temperature of indoor heat exchanger falls.

3. Defrosting

Defrosting starts when the temperature of outdoor heat exchanger becomes too low.

The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses, and the compressor re-starts.

This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.

or button to select the desired temperature.

8-5. AUTO CHANGE OVER ··· AUTO MODE OPERATION

Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation.

Mode selection

(1) Initial mode

When unit starts the operation with AUTO operation from OFF:

• If the room temperature is higher than the set temperature, operation starts in COOL mode.

• If the room temperature is equal to or lower than the set temperature, operation starts in HEAT mode.

(2) Mode change

COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 2°F (1°C) below the set temperature. HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 2°F (1°C) above the set temperature.

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