Mitsubishi MS-18NV- E4, MU-18NV- E4 Service Manual

SPLIT-TYPE AIR CONDITIONERS

No. OB228

SERVICE MANUAL

Wireless type

Models

MS-18NV - E4 (WH) · MU-18NV - E4

CONTENTS

		1. TECHNICAL CHANGES ····································2
		2. PART NAMES AND FUNCTIONS······················2
		3. SPECIFICATION·················································4
		4. OUTLINES AND DIMENSIONS ·························5
		5. WIRING DIAGRAM ············································6
	MS-18NV - E4	6. REFRIGERANT SYSTEM DIAGRAM ················7
		7. PERFORMANCE CURVES ································8
		8. MICROPROCESSOR CONTROL ····················10
		9. SERVICE FUNCTIONS ····································16
		10.	TROUBLESHOOTING······································18
		11. DISASSEMBLY INSTRUCTIONS·····················24
		12.	PARTS LIST··················································· ···28
		13.	OPTIONAL PARTS···········································31

1 TECHNICAL CHANGES

MS-18NV - E3 MS-18NV - E4

1. Indoor electronic control P.C. board has changed.

MU-18NV - E3 MU-18NV - E4

1.Compressor has changed.(NH-33VMDT PH-33VPET)

2.Outdoor heat exchanger has changed.

3.Refrigerant filling capacity(R-22) has changed.(1.65kg 1.05kg)

2 PART NAMES AND FUNCTIONS

INDOOR UNIT

MS-18NV - E4

Grille

Air cleaning filter(option)

Deodorizing filter(option)

Remote control receiving section

(When the grille is open)

2

OUTDOOR UNIT

MU-18NV - E4

REMOTE CONTROLLER

MS-18NV - E4

Signal transmitting section

Operation display section

OPERATE /STOP (ON /OFF)button

OPERATION SELECT button

FAN SPEED CONTROL button

SLEEP button

ON-TIMER button

CLOCK SET button

HR. button MIN. button (TIME SET button)

TEMPERATURE buttons

VANE CONTROL button SWING buttons

OFF-TIMER button RESET button

3

3

SPECIFICATION

Model

MS-18NV -

E4

Function

Cooling

Power supply

Single phase, 220-240V, 50Hz

Capacity

kW

5.1

Capacity

Dehumidification

R/h

2.5

Air flow(Hi)

K /h

INDOOR 756 / OUTDOOR 2340-2400

Power outlet

A

15

Running current

A

9.1

Power input

W

1,910-2,010

Electrical data

Auxiliary heater

A(kW)

—

Power factor

%

95-92

Starting current

A

51-55

Compressor motor current

A

8.46

Fan motor current

A

INDOOR 0.25 / OUTDOOR 0.39

Coefficient of performance(C.O.P)

2.67-2.54

Model

PH-33VPET

Compressor

Output

W

1,500

Winding resistance(at20:)

"

C-R1.08 C-S 2.18

Indoor

Model

RA4V27-EA or EF

fan motor

Winding resistance(at20:)

"

WHT-BLK183.8 BLK-RED250.5

Outdoor

Model

RA6V50-OF or OG

fan motor

Winding resistance(at20:)

"

WHT-BLK116.4 BLK-RED111

Width

mm

1,015

Indoor unit

Height

mm

320

Dimensions

Depth

mm

190

Width

mm

850

Outdoor unit

Height

mm

605

Depth

mm

290

Weight

Indoor unit

kg

14

Outdoor unit

kg

48

Air direction

5

Sound level

Indoor unit

dB

42

(Hi)

Outdoor unit

dB

52

Fan speed

Indoor unit

rpm

1,180

(Hi)

Outdoor unit

rpm

830-860

Special remarks

Fan speed

Indoor unit

4

regulator

Outdoor unit

1

Refrigerant filling capacity(R-22)

kg

1.05

Refrigerating oil

(Model)

cc

900 (MS32N1)

Thermistor

RT11(at25:)

k"

10

RT12(at25:)

k"

10

NOTE:Test conditions

Cooling : Indoor

DB27: / WB19:

Outdoor

DB35: / WB24:

4

4 OUTLINES AND DIMENSIONS

MS-18NV - E4

INDOOR UNIT

995

4holes 11o20

150

648

60

40

450

450

438

Unit : mm

Indoor unit

217

	20
254	297

3

352

Installation plate

1015

190

320				Air in
50	775		190	Air out
		17.5		Power supply cord
	56			Lead to right 2m
				Lead to left 1m
	160

Wireless remote controller

MU-18NV - E4

OUTDOOR UNIT

Wall hole [75

5

Installation plate

Liquid line [8-0.5m {Gas line [12-0.43m Insulation [50 O.D

[28 I.D

Drain hose [16

Insulation [28

If the front or right/left sides are vacant, the top has only to be 10cm unobstructed.

If the right/left sides or back side is vacant,the front has only to be 50cm unobstructed.

5

5 WIRING DIAGRAM

MS-18NV - E4

MODEL WIRING DIAGRAM

INDOOR UNIT

L

TB

BRN

w

CN

RT12

TO OUTDOOR

BRN

HIC1

IC141

112

UNIT

CONNECTING

w

F12

BLU

w

3

BRN

220-240V~

2

2

4

NR11

CN

WHT

BLU

CN201

w 3 52C

121

YLW

w

1

N w

3

CN211

GRY

BLU

C11

BLU

TRANS

WHT

MF

1

4

BLU

BRN

F11

2

RED

BLK

GRN/YLW

LD1

1

POWER

CN

CN

CN

SUPPLY

ELECTRONIC CONTROL P.C BOARD

CN

RT11

CORD

DSAR

101

102

151

111

~/N 220-240V

5

50Hz

3

3

MV

RECEIVER

DISPLAY

CIRCUITBREAKER

P.C.BOARD

P.C.BOARD

GRN/YLW

REMOTE

CONTROLLER

SYMBOL	NAME	SYMBOL	NAME	SYMBOL	NAME
C11	INDOOR FAN CAPACITOR	IC141	HYBRID IC	RT12	INDOOR COIL THERMISTOR
DSAR	SURGE ABSORBER	MF	INDOOR FAN MOTOR	TB	TERMINAL BLOCK
F11	FUSE(3.15A)	MV	VANE MOTOR	52C	CONTACTOR
F12	THERMAL FUSE(93¡C)	NR11	VARISTOR
HIC1	DC / DC CONVERTER	RT11	ROOM TEMPERATURE THERMISTOR

NOTE:1. For the outdoor electric wiring refer to the outdoor unit electric wiring diagram for servicing.

2.Use copper conductors only.(For field wiring)

3.Symbols below indicate.

:Terminal block, : Connector

MU-18NV - E4

OUTDOOR UNIT MODEL WIRING DIAGRAM

		220-240V~	TB
		2	w		WHT
			WHT				C
	FROM				C1
		N	w	BLU		RED	MC
	INDOOR UNIT
						S
	CONNECTING						R
			F			BLK

GRN/YLW

C2

RED RED

ORN 1 ORN

WHT 2 WHT MF

BLU 3 BLK

			4
SYMBOL	NAME	SYMBOL	NAME	SYMBOL	NAME
C1	COMPRESSOR CAPACITOR	F	FUSE(2A)	MF	OUTDOOR FAN MOTOR(INNER THEMOSTAT)
C2	OUTDOOR FAN CAPACITOR	MC	COMPRESSOR(INNER THERMOSTAT)	TB	TERMINAL BLOCK

NOTE:1. Use copper conductors only.(For field wiring)

2.“w”show the terminals with a lock mechanism, so they cannot be removed when you pull the lead wire.

Be sure to pull the wire by pushing the locking lever(projected part) of the terminal with a finger.

3.Symbols below indicate.

: Terminal block,

: Connector

1.Slide the sleeve. 2.Pull the wire while

pushing the locking lever.

6

6 REFRIGERANT SYSTEM DIAGRAM

MS-18NV - E4		Unit:mm
		MU-18NV - E4
INDOOR UNIT	Refrigerant pipe [15.88	OUTDOOR UNIT
	(Option)
	(with heat insulator)

Accumulator

Indoor coil

Stop valve

Indoor

Outdoor

heat

thermistor

(with service port)

heat

RT12

exchanger

Strainer

exchanger

Distributor

Flared

connection

Compressor

Room temperature

thermistor

Capillary tube

RT11

Stop valve

[3.0X[2.0X700

Refrigerant pipe [6.35

(Option)

(with heat insulator)

Refrigerant flow in cooling

MAX. REFRIGERANT PIPING LENGTH

Refrigerant piping

Length of connecting pipe : m

Model

Piping size O.D : mm

Max. length : m

A

Gas

Liquid

Indoor unit

Outdoor unit

MS-18NV -

15

15.88

6.35

Gas 0.43

Gas 0

E4

Liquid 0.5

Liquid 0

MAX. HEIGHT DIFFERENCE

Indoor unit

	Refrigerant Piping
w Max. Height	Max.length
difference 5m	A

Outdoor unit

wHeight difference should be within 5m regardless of which unit, indoor or outdoor position is high.

ADDITIONAL REFRIGERANT CHARGE(R-22 : g)

	Model			Outdoor unit precharged		Refrigerant piping length (one way)
					7m	10m	15m
	MS-18NV -			1050	0	45	120
		E4

Calculation : Xg=15g/mO(A-7)m

7

7 PERFORMANCE CURVES

MS-18NV - E4

The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions vary according to the areas where these units are installed. The following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.

(1) GUARANTEED VOLTAGE

Rated voltage : ±10% (198 ~ 264V),50Hz

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

(1)	Indoor intake air wet-bulb temperature	:°CWB	}	Cooling
(2)	Indoor outlet air wet-bulb temperature	:°CWB
(3)	Outdoor intake air dry-bulb temperature	:°CDB
(4) Total input		:W

Indoor air wet-bulb temperature difference on the left side of the chart on next page shows the difference between the indoor intake air wet-bulb temperature and the indoor outlet air wet-bulb temperature for your reference at service.

How to measure the indoor air wet-bulb temperature difference

1.Attach at least 2 sets of wet-and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets of wet-and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high.

2.Attach at least 2 sets of dry-bulb thermometers to the outdoor air inlet. Cover the thermometers to prevent direct rays of the sun.

3.Check that the air filter is cleaned.

4.Open windows and doors of room.

5.Press the EMERGENCY OPERATION switch to start the EMERGENCY operation.

6.When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.

7.10 minutes later, measure temperature again and check that the temperature does not change.

INDOOR UNIT	OUTDOOR UNIT
Wet and dry-bulb	Dry-bulb
thermometers
	thermometers

8

MS-18NV - E4

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation

1 Both indoor and outdoor unit are under the same temperature/humidity condition.

Dry-bulb temperature	Relative humidity(%)
20	50
25	60
30	70

2 Air flow should be set at MAX.

3The unit of pressure has been changed to MPa on the international system of units(SI unit system). The conversion factor is : 1(MPa • G) =10.2(kgf/f • G)

(kgf/F•G)(MPa•G)							MU-18NV -
												E4
pressure	7	0.7
			0.6
	6
									220V/240V
low	5				0.5
Outdoor
				0.4
	4
			0.3
	3
		15					18 20		25		30 32 35(:)
							50		60		70(%)

Ambient temperature(˚C)Ambient humidity(%)

Outdoor unit current(A)

MU-18NV - E4

11
10
9
8					220V/240V
7
6
						30 32 35(:)
15 18 20			25
50			60			70(%)

Ambient temperature(˚C)Ambient humidity(%)

9

8 MICROPROCESSOR CONTROL

WIRELESS REMOTE CONTROLLER

Signal transmitting section
Operation display section
OPERATE /STOP
(ON /OFF)button
OPERATION SELECT button	TEMPERATURE buttons
FAN SPEED CONTROL button	VANE CONTROL button
SLEEP button	SWING buttons
ON-TIMER button	OFF-TIMER button
CLOCK SET button	RESET button
HR. button
MIN. button
(TIME SET button)

MS-18NV - E4

Once the operation mode are set, the same operation mode can be repeated by simply turning the OPERATE/STOP(ON/OFF) button ON.

Indoor unit receives the signal with a beep tone.

When the system turns off, 3-minute time delay will operate to protect system from overload and compressor will not restart for 3 minutes.

8-1. “I FEEL CONTROL” ( ) OPERATION

(1)Press OPERATE/STOP(ON/OFF) button on the remote controller. Operation Indicator lamp of the indoor unit turns on with a beep tone.

(2)Select “I FEEL CONTROL”( ) mode with the OPERATION SELECT button.

(3)The operation mode is determined by the room temperature at start-up of the operation.

	Initial room temperature	mode
	25: or more	COOL mode of
		“I FEEL CONTROL“
	more than 13:,	DRY mode of
	less than 25:	“I FEEL CONTROL”

INDOOR UNIT DISPLAY SECTION

Operation Indicator lamp

The operation indicator at the right side of the indoor unit indicates the operation state.

Operation Indicator

lighting

not lighting

●Once the mode is fixed, the mode does not change by room temperature afterwards.

●Under the ON-TIMER ( ) operation, the mode is determined according to the room temperature as the operation starts.

●When the system is stopped with the

OPERATE/STOP(ON/OFF) button on the remote controller, and restarted within 2 hours in “I FEEL CONTROL” ( ) mode, the system operates in previous mode automatically regardless of the room temperature.

Example
Previous operation				Restart
COOL mode of				COOL mode of
“I FEEL CONTROL” or				“I FEEL CONTROL”
COOL mode

Difference betweeen set

Indication Operation state temperature and room temperature

This shows that the air conditioner is operating to reach

the target temperature.

About 2 :

Please wait unitil the target temperature is obtained.

or more

This shows that the
room temperature is	About 2 :
approaching the	or less
target temperature.

When the system is restarted after 2 hours and more, the operation mode is determined by the room temperature at start-up of the operation.

Example				Restart
				COOL or DRY mode of
Previous operation				“I FEEL CONTROL” that
COOL mode of				determined by room
“I FEEL CONTROL”				temperature at start-up
or COOL mode				of the operation.

10