Mitsubishi Electronics MSZ-EF09NAW, MSZ-EF12NAW, MSZ-EF15NAW, MSZ-EF18NAW, MSZ-EF09NAB User Manual

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INDOOR UNIT

SERVICE MANUAL

Models

No. OBH736

MSZ-EF09NAW MSZ-EF15NAW MSZ-EF09NAB MSZ-EF15NAB MSZ-EF09NAS MSZ-EF15NAS -

MSZ-EF12NAW MSZ-EF18NAW MSZ-EF12NAB MSZ-EF18NAB MSZ-EF12NAS MSZ-EF18NAS -

Outdoor unit service manual MXZ- ∙C∙NA(HZ) Series (OCH573)

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

NOTE:

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

PARTS CATALOG (OBB736)

Use the speciﬁ ed refrigerant only

OBH736

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.

TECHNICAL CHANGES

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS -

1. New model

MSZ-EF12NAW -

MSZ-EF12NAB -

MSZ-EF12NAS -

MSZ-EF15NAW -

MSZ-EF15NAB -

MSZ-EF15NAS -

MSZ-EF18NAW -

MSZ-EF18NAB -

MSZ-EF18NAS -

OBH736

PART NAMES AND FUNCTIONS

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

Front panel

Air ¿ lter (Nano platinum ¿ lter)

Air cleaning ¿ lter (Electrostatic anti-allergy enzyme ¿ lter)

Air inlet

Horizontal vane

Air outlet Heat exchanger

Operation indicator lamp

ACCESSORIES

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

Model

Installation plate 1 Installation plate ﬁ 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 ﬁ lter 2

MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

Emergency operation switch

Remote control receiving section

Remote controller

OBH736

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 0.6 2.1 3.6 4.4

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

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

Dimensions

Weight Ib. 26

External ﬁ nish

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 7-11/16 H 11-3/4

MSZ-EF09NAW

MSZ-EF09NAB MSZ-EF09NAS

371 - 293 - 222 - 162 - 141

CFM

(319 - 252 - 191 - 140 - 121)

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

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

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

in.

MSZ-EF12NAW

MSZ-EF12NAB MSZ-EF12NAS

371 - 293 - 222 - 162 - 141

(319 - 252 - 191 - 140 - 121)

W: Munsell 1.0Y 9.2/0.2 B: Munsell 3.7PB 2.0/0.1 S: Munsell 3.1PB 8.2/0.2

MSZ-EF15NAW

MSZ-EF15NAB MSZ-EF15NAS

364 - 314 - 272 - 233 - 205

(313 - 270 - 234 - 200 - 176)

34-13/16

MSZ-EF18NAW

MSZ-EF18NAB MSZ-EF18NAS

388 - 328 - 279 - 240 - 205

(334 - 282 - 240 - 206 - 176)

3-1. OPERATING RANGE

(1) POWER SUPPLY

Rated voltage Guaranteed voltage (V)

Indoor unit

208/230 V

1 phase

(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 -13 -14

60 Hz

Min. 187

DB WB DB WB

208 230 Max. 253

Intake air temperature (°F)

Indoor Outdoor

3-2. OUTLET AIR SPEED AND COVERAGE

OBH736

Model Mode Function

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS

MSZ-EF12NAW MSZ-EF12NAB MSZ-EF12NAS

MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS

MSZ-EF18NAW MSZ-EF18NAB MSZ-EF18NAS

HEAT Dry 420 19.5 29.2

COOL

HEAT Dry 448 20.8 31.1

COOL

HEAT Dry 448 20.8 31.1

COOL

HEAT Dry 466 21.6 32.3

COOL

Airﬂ ow

(CFM)

Dry 371 17.2 25.8

Wet 319 15.5 23.3

Dry 371 17.2 25.8

Wet 319 15.5 23.3

Dry 364 16.8 25.4

Wet 313 15.2 22.9

Dry 388 20.3 30.4

Wet 336 18.3 27.4

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.

OBH736

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

OUTLINES AND DIMENSIONS

Unit: inch

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

OBH736

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

WIRING DIAGRAM

OBH736

REFRIGERANT SYSTEM DIAGRAM

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

Unit: inch (mm)

Refrigerant pipe ø3/8 (ø9.52) (MSZ-EF09/12) ø1/2 (ø12.7) (MSZ-EF15/18) (with heat insulator)

Indoor heat exchanger

Indoor coil thermistor RT13 (sub)

Room temperature thermistor RT11

Indoor coil thermistor RT12 (main)

Flared connection

Refrigerant pipe ø1/4 (ø6.35) (with heat insulator)

Refrigerant flow in cooling Refrigerant flow in heating

OBH736

SERVICE FUNCTIONS

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

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 (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. AUTO RESTART FUNCTION

OBH736

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

IC171

CN104CN112

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.

OBH736

MICROPROCESSOR CONTROL

MSZ-EF09NAW MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW MSZ-EF09NAB MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS

WIRELESS REMOTE CONTROLLER

Signal transmitting section

Operation display section

TEMPERATURE buttons

OPERATION SELECT button

ECONO COOL button

SMART SET button

STOP/OPERATE (OFF/ON) button

Indication of remote controller model is on back

FAN SPEED CONTROL button

VANE CONTROL button

TIME, TIMER set buttons FORWARD button BACKWARD button

WEEKLY TIMER set button

RESET button

CLOCK SET 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.

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 multi system 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

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