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

INDOOR UNIT

SERVICE MANUAL	No. OBH736

Models

MSZ-EF09NAW - U1 MSZ-EF15NAW - U1 MSZ-EF09NAB - U1 MSZ-EF15NAB - U1 MSZ-EF09NAS - U1 MSZ-EF15NAS - U1

MSZ-EF12NAW - U1 MSZ-EF18NAW - U1 MSZ-EF12NAB - U1 MSZ-EF18NAB - U1 MSZ-EF12NAS - U1 MSZ-EF18NAS - U1

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

PARTS CATALOG (OBB736)

NOTE:

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

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.

1 TECHNICAL CHANGES

MSZ-EF09NAW - MSZ-EF09NAB - MSZ-EF09NAS -

1. New model

U1

U1

U1

MSZ-EF12NAW - MSZ-EF12NAB - MSZ-EF12NAS -

U1

U1

U1

MSZ-EF15NAW - MSZ-EF15NAB - MSZ-EF15NAS -

U1

U1

U1

MSZ-EF18NAW - MSZ-EF18NAB - MSZ-EF18NAS -

U1

U1

U1

OBH736	2

2 PART NAMES AND FUNCTIONS

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS

MSZ-EF12NAW MSZ-EF12NAB MSZ-EF12NAS

MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS

MSZ-EF18NAW MSZ-EF18NAB 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

Emergency operation switch

Operation	Remote control
indicator lamp	receiving section

ACCESSORIES

Remote controller

		MSZ-EF09NAW	MSZ-EF12NAW MSZ-EF15NAW MSZ-EF18NAW
	Model	MSZ-EF09NAB	MSZ-EF12NAB MSZ-EF15NAB MSZ-EF18NAB
		MSZ-EF09NAS MSZ-EF12NAS MSZ-EF15NAS MSZ-EF18NAS
	Installation plate		1
	Installation plate fixing 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 filter		2

OBH736	3

3			SPECIFICATION
Indoor unit 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
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
Airflow				COOL Dry	CFM	371 - 293 - 222 - 162 - 141	371 - 293 - 222 - 162	- 141	364 - 314 - 272 - 233 - 205	388 - 328 - 279 - 240 - 205
				(Wet)		(319 - 252 - 191 - 140 - 121)	(319 - 252 - 191 - 140	- 121)	(313 - 270 - 234 - 200 - 176)	(334 - 282 - 240 - 206 - 176)
Super high - High - Med. - Low - Quiet
				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				Cooling	dB(A)	42 - 36 - 29 - 23 - 21	42 - 36 - 29 - 24	- 21	42 - 39 - 35 - 31 - 28	43 - 40 - 36 - 33 - 30
Super high - High - Med. - Low - Quiet				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
				W			34-13/16
Dimensions				D	in.			7-11/16
				H				11-3/4
Weight					Ib.			26
							W: Munsell 1.0Y 9.2/0.2
External finish							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 VDC

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

3-1. OPERATING RANGE

(1) POWER SUPPLY

		Rated voltage	Guaranteed voltage (V)
		208/230 V	Min. 187 208			230 Max. 253
	Indoor unit	1 phase
		60 Hz

(2) OPERATION

Mode	Condition			Intake air temperature (°F)
		Indoor				Outdoor
		DB		WB	DB		WB
	Standard temperature	80		67	95		—
Cooling	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

OBH736	4

3-2. OUTLET AIR SPEED AND COVERAGE

	Model	Mode	Function	Airflow	Air speed	Coverage (ft.)
				(CFM)	(ft./s)		● The air coverage is the figure up to the
	MSZ-EF09NAW	HEAT	Dry	420	19.5	29.2
							position where the air speed is 1 ft./s,
	MSZ-EF09NAB	COOL	Dry	371	17.2	25.8	when air is blown out horizontally from
	MSZ-EF09NAS		Wet	319	15.5	23.3	the unit properly at the High speed
	MSZ-EF12NAW	HEAT	Dry	448	20.8	31.1	position.
	MSZ-EF12NAB	COOL	Dry	371	17.2	25.8	The coverage should be used only
	MSZ-EF12NAS		Wet	319	15.5	23.3	as a general guideline since it varies
							according to the size of the room and
	MSZ-EF15NAW	HEAT	Dry	448	20.8	31.1
							furniture arranged inside the room.
	MSZ-EF15NAB	COOL	Dry	364	16.8	25.4
	MSZ-EF15NAS
			Wet	313	15.2	22.9
	MSZ-EF18NAW	HEAT	Dry	466	21.6	32.3
	MSZ-EF18NAB	COOL	Dry	388	20.3	30.4
	MSZ-EF18NAS		Wet	336	18.3	27.4

OBH736	5

4 OUTLINES AND DIMENSIONS

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS

MSZ-EF12NAW MSZ-EF12NAB MSZ-EF12NAS

MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS

MSZ-EF18NAW

MSZ-EF18NAB

MSZ-EF18NAS

Unit: inch

MSZ-EF09/12NA

MSZ-EF15/18NA

OBH736	6

5 WIRING DIAGRAM

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS

MSZ-EF12NAW MSZ-EF12NAB MSZ-EF12NAS

MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS

MSZ-EF18NAW MSZ-EF18NAB MSZ-EF18NAS

OBH736	7

6 REFRIGERANT SYSTEM DIAGRAM

MSZ-EF09NAW MSZ-EF09NAB MSZ-EF09NAS

MSZ-EF12NAW MSZ-EF12NAB MSZ-EF12NAS

MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS

MSZ-EF18NAW MSZ-EF18NAB 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	Indoor coil
	thermistor
heat
	RT12 (main)
exchanger		Flared connection

Indoor coil thermistor RT13 (sub)

Room temperature thermistor

RT11

Flared connection

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

Refrigerant flow in cooling

Refrigerant flow in heating

OBH736	8

7 SERVICE FUNCTIONS

MSZ-EF09NAW	MSZ-EF12NAW
MSZ-EF09NAB	MSZ-EF12NAB
MSZ-EF09NAS	MSZ-EF12NAS
7-1. TIMER SHORT MODE

MSZ-EF15NAW MSZ-EF15NAB MSZ-EF15NAS

MSZ-EF18NAW MSZ-EF18NAB MSZ-EF18NAS

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.

OBH736	9

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.)

Indoor electronic
control P.C. board
IC171
CN104
CN112	BZ
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 cancelled.

•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	10

8 MICROPROCESSOR CONTROL

MSZ-EF09NAW	MSZ-EF12NAW	MSZ-EF15NAW
MSZ-EF09NAB	MSZ-EF12NAB	MSZ-EF15NAB
MSZ-EF09NAS	MSZ-EF12NAS	MSZ-EF15NAS

WIRELESS REMOTE CONTROLLER

MSZ-EF18NAW MSZ-EF18NAB MSZ-EF18NAS

Signal transmitting section

Operation display section

TEMPERATURE buttons

FAN SPEED CONTROL button

OPERATION SELECT button

VANE CONTROL button

ECONO COOL button

	TIME, TIMER set buttons
	FORWARD button
	BACKWARD button
SMART SET button
STOP/OPERATE	WEEKLY TIMER
(OFF/ON) button	set button
	RESET button
Indication of	CLOCK SET button
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	About 4°F (2°C) or more
		away from set tempera-
	reach the set temperature
		ture
	The room temperature is	About 2 to 4°F (1 to 2°C)
	approaching the set tem-
		from set temperature
	perature
	Standby mode	-
	(Only during multi system
	operation)

Lighted

Blinking

Not lighted

OBH736	11