Mitsubishi Electric MSZ-EF18NAW-U1 Manuale utente

SERVICE MANUAL

INDOOR UNIT

No. OBH736

REVISED EDITION-C

Models

MSZ-EF09NAW -U1 , U2 MSZ-EF12NAW -U1 , U2

MSZ-EF15NAW -U1 , U2 MSZ-EF18NAW -U1 , U2

MSZ-EF09NAB -U1 , U2 MSZ-EF12NAB -U1 , U2

MSZ-EF15NAB -U1 , U2 MSZ-EF18NAB -U1 , U2

MSZ-EF09NAS -U1 , U2 MSZ-EF12NAS -U1 , U2

MSZ-EF15NAS -U1 , U2 MSZ-EF18NAS -U1 , U2

Outdoor unit service manual

MXZ- •C•NA Series (OBH702, OCH573)

MXZ- •C•NAHZ Series (OBH702, CH573)

OBH736 REVISED EDITION-B is void.

Revision C:

• 9-7. TEST POINT DIAGRAM AND

VOLTAGE has been modied.

CONTENTS

1. TECHNICAL CHANGES ······························2

2. PART NAMES AND FUNCTIONS ··················3

3. SPECIFICATION ········································4

4. OUTLINES AND DIMENSIONS ·····················6

5. WIRING DIAGRAM ·····································7

6. REFRIGERANT SYSTEM DIAGRAM ·············8

7. SERVICE FUNCTIONS································9

8. MICROPROCESSOR CONTROL················· 11

9. TROUBLESHOOTING·······························19

10. DISASSEMBLY INSTRUCTIONS·················31

PARTS CATALOG (OBB736)

MSZ-EF09NAW - U1 MSZ-EF12NAW - U1 MSZ-EF15NAW - U1 MSZ-EF18NAW - U1

MSZ-EF09NAB - U1 MSZ-EF12NAB - U1 MSZ-EF15NAB - U1 MSZ-EF18NAB - U1

MSZ-EF09NAS - U1 MSZ-EF12NAS - U1 MSZ-EF15NAS - U1 MSZ-EF18NAS - U1

1. New model

MSZ-EF09NAW - U1 MSZ-EF09NAW - U2

MSZ-EF09NAB - U1 MSZ-EF09NAB - U2

MSZ-EF09NAS - U1 MSZ-EF09NAS - U2

MSZ-EF12NAW - U1 MSZ-EF12NAW - U2

MSZ-EF12NAB - U1 MSZ-EF12NAB - U2

MSZ-EF12NAS - U1 MSZ-EF12NAS - U2

MSZ-EF15NAW - U1 MSZ-EF15NAW - U2

MSZ-EF15NAB - U1 MSZ-EF15NAB - U2

MSZ-EF15NAS - U1 MSZ-EF15NAS - U2

MSZ-EF18NAW - U1 MSZ-EF18NAW - U2

MSZ-EF18NAB - U1 MSZ-EF18NAB - U2

MSZ-EF18NAS - U1 MSZ-EF18NAS - U2

1. Model name has been changed.

Revision A:

• 4. OUTLINES AND DIMENTIONS has been modified.

• Some descriptions have been modified.

Revision B:

• MSZ-EF09/12/15/18NAW/B/S-U2 have been added.

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.

Prepare the proper tools.

Prepare the proper protectors.

Provide adequate ventilation.

After stopping the operation of the air conditioner, turn off the power-supply breaker and pull the power plug.

Discharge the capacitor before the work involving the electric parts.

Do not perform the work involving the electric parts with wet hands.

Do not pour water into the electric parts.

Do not touch the refrigerant.

Do not touch the hot or cold areas in the refrigeration cycle.

When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to

touch the live parts.

WARNING

• When the refrigeration circuit has a leak, do not execute pump down with the compressor.

• When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.

The compressor may burst if air etc. get into it.

• When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap

between the valve stem and the valve body, resulting in injuries.

Revision C:

• 9-7. TEST POINT DIAGRAM AND VOLTAGE has been modied.

1 TECHNICAL CHANGES

OBH736C

PART NAMES AND FUNCTIONS2

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW

MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB

MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

ACCESSORIES

Model

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW

MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB

MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

Installation plate 1

Installation plate xing screw 4 × 25 mm 5

Remote controller holder 1

Fixing screw for 3.5 × 16 mm (Black) 2

Battery (AAA) for remote controller 2

Wireless remote controller 1

Felt tape (For left or left-rear piping) 1

Soft dry cloth (NAB type only) 1

Air cleaning lter 2

Remote controller

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)

Heat exchanger

Front panel

Air outlet

OBH736C

3 SPECIFICATION

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

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

Indoor unit model MSZ-EF09NAW

MSZ-EF09NAB

MSZ-EF09NAS

MSZ-EF12NAW

MSZ-EF12NAB

MSZ-EF12NAS

MSZ-EF15NAW

MSZ-EF15NAB

MSZ-EF15NAS

MSZ-EF18NAW

MSZ-EF18NAB

MSZ-EF18NAS

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

Airow

Super high - High - Med. - Low - Quiet

COOL Dry

(Wet) CFM

371 - 293 - 222 - 162 - 141

(319 - 252 - 191 - 140 - 121)

371 - 293 - 222 - 162 - 141

(319 - 252 - 191 - 140 - 121)

364 - 314 - 272 - 233 - 205

(313 - 270 - 234 - 200 - 176)

388 - 328 - 279 - 240 - 205

(334 - 282 - 240 - 206 - 176)

HEAT Dry CFM

420 - 314 - 219 - 162 - 141 448 - 314 - 219 - 162 - 141 448 - 350 - 275 - 222 - 194 466 - 392 - 318 - 258 - 226

Moisture removal pt./h 0.6 2.1 3.6 4.4

Sound level

Super high - High - Med. - Low - Quiet

Cooling dB(A)

42 - 36 - 29 - 23 - 21 42 - 36 - 29 - 24 - 21 42 - 39 - 35 - 31 - 28 43 - 40 - 36 - 33 - 30

Heating dB(A)

45 - 37 - 29 - 24 - 21 46 - 38 - 30 - 24 - 21 48 - 41 - 35 - 30 - 28 49 - 43 - 37 - 33 - 30

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

Dimensions

in.

34-13/16

D 7-11/16

H 11-3/4

Weight Ib. 26

External nish

W: Munsell 1.0Y 9.2/0.2

B: Munsell 3.7PB 2.0/0.1

S: Munsell 3.1PB 8.2/0.2

Remote controller Wireless type

Control voltage (by built-in transformer) 12 - 24 V DC

NOTE: Test conditions are based on AHRI 210/240.

OBH736C

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.

Model Mode Function Airow

(CFM)

Air speed

(ft./s)

Coverage

(ft.)

MSZ-EF09NAW

MSZ-EF09NAB

MSZ-EF09NAS

HEAT Dry 420 19.5 29.2

COOL Dry 371 17.2 25.8

Wet 319 15.5 23.3

MSZ-EF12NAW

MSZ-EF12NAB

MSZ-EF12NAS

HEAT Dry 448 20.8 31.1

COOL Dry 371 17.2 25.8

Wet 319 15.5 23.3

MSZ-EF15NAW

MSZ-EF15NAB

MSZ-EF15NAS

HEAT Dry 448 20.8 31.1

COOL Dry 364 16.8 25.4

Wet 313 15.2 22.9

MSZ-EF18NAW

MSZ-EF18NAB

MSZ-EF18NAS

HEAT Dry 466 21.6 32.3

COOL Dry 388 20.3 30.4

Wet 336 18.3 27.4

OBH736C

4OUTLINES AND DIMENSIONS

Unit: inch

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW

MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB

MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

2-3/8

7-5/8

11/16

3-3/8

2-3/16

1-15/16

2-13/16

8-7/8

7-1/16 7-1/16

10-1/16

3-1/4

8-3/8

9-1/8 7/8

1-3/4

1/4

9-3/161-3/4

2-7/16 2-15/1614-15/16 14-1/2

34-13/16

34-7/16 3/16

9-13/16

7-11/163/16

2-13/16

1-7/8

26-11/16 6

(80 )

1/4

3-15/16

4-5/16

3-11/16

2-3/16

2-5/16

11-3/4

(2-1/8)

Air out

Installation plate

Piping

Drain hose

7/16 × 1 Oblong hole

7/16 × 13/16 Oblong hole

Installation plate

Indoor unit

Wall hole

2-15/16

Air in

In case of left,

left back,or

left under piping

(using spacer),

4-3/8 or more.

1/4 or more

2-1/4 or more

1-3/8 or more

1 or more

MSZ-EF09/12NA MSZ-EF15/18NA

OBH736C

WIRING DIAGRAM5

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW

MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB

MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

OBH736C

6 REFRIGERANT SYSTEM DIAGRAM

Unit: inch (mm)

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW

MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB

MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Flared connection

Refrigerant pipe ø3/8 (ø9.52) (MSZ-EF09/12)

ø1/2 (ø12.7) (MSZ-EF15/18

)

(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

OBH736C

SERVICE FUNCTIONS7

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.)

• The set time for the ON/OFF timer can be reduced to 1 second for each minutes.

• After the breaker is turned on, the time for starting the compressor, which normally takes 3 minuets, can be reduced to

3 seconds. Restarting the compressor, which takes 3 minuets, cannot be reduced.

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.

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW

MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB

MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

OBH736C

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 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 start-

ing 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

IC171

CN104CN112

Indoor electronic

control P.C. board

OBH736C

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