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

SPLIT-TYPE AIR CONDITIONERS

SERVICE MANUAL

Wireless type Models

No. OB228

MS-18NV -

(WH)

· MU-18NV -

CONTENTS

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

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

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

4. OUTLINES AND DIMENSIONS·························5

5. WIRING DIAGRAM ············································6

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

E4E4

TECHNICAL CHANGES

MS-18NV - ➔MS-18NV -

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

MU-18NV - ➔MU-18NV -

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)

PART NAMES AND FUNCTIONS

E4E3

INDOOR UNIT

MS-18NV -

Air cleaning filter(option)

Grille

Deodorizing filter(option)

(When the grille is open)

Remote control receiving section

TEMPERATURE buttons

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)

VANE CONTROL button

OFF-TIMER button

RESET button

SWING buttons

OUTDOOR UNIT MU-18NV -

REMOTE CONTROLLER

MS-18NV -

Capacity

Electrical data

Compressor

Indoor

fan motor

Outdoor

fan motor

Dimensions

Weight

Special remarks

Model

Function

Power supply

Coefficient of performance(C.O.P)

Capacity Dehumidification Air flow(Hi) Power outlet Running current Power input Auxiliary heater Power factor Starting current Compressor motor current Fan motor current

Model Output Winding resistance(at20:) Model Winding resistance(at20:) Model Winding resistance(at20:)

Indoor unit

Outdoor unit

Indoor unit Outdoor unit Air direction Sound level (Hi) Fan speed (Hi) Fan speed regulator Refrigerant filling capacity(R-22) Refrigerating oil (Model)

Thermistor

Width Height Depth Width Height Depth

Indoor unit Outdoor unit Indoor unit Outdoor unit Indoor unit Outdoor unit

RT11(at25:) RT12(at25:)

R/h

K /h

A A

A(kW)

A A A



"

mm mm mm mm mm mm

kg kg

dB rpm rpm

cc k" k"

MS-18NV -

Single phase, 220-240V, 50Hz

—

WHT-BLK183.8 BLK-RED250.5

1,015

320 190 850 605 290

10 10

Cooling

5.1

2.5

INDOOR 756 / OUTDOOR 2340-2400

9.1

1,910-2,010

95-92 51-55

8.46

INDOOR 0.25 / OUTDOOR 0.39

2.67-2.54

PH-33VPET

1,500

C-R1.08

C-S 2.18

RA4V27-EA or EF

RA6V50-OF or OG

WHT-BLK116.4 BLK-RED111

42 52

1,180

830-860

1.05

900 (MS32N1)

SPECIFICATION

NOTE:Test conditions

Cooling : Indoor DB27: / WB19:

Outdoor DB35: / WB24:

3 297

450 450

352438

254

150 648 217

5190

995

19077550

320

1015

17.5

160

4holes 11o20

Indoor unit

Installation plate

Wireless remote controller

Power supply cord Lead to right 2m Lead to left 1m

Wall hole [75

Installation plate

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

[28 I.D

Insulation [28

Drain hose [16

Air out

{

Air in

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

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

OUTLINES AND DIMENSIONS

MS-18NV -

INDOOR UNIT

Unit : mm

MU-18NV -

OUTDOOR UNIT

SYMBOL

RT12

52C

SYMBOL

IC141

MF MV

NR11

RT11

SYMBOL

C11

DSAR

F11 F12

HIC1

NAME

NAME NAME INDOOR FAN CAPACITOR SURGE ABSORBER FUSE(3.15A) THERMAL FUSE(93¡C) DC / DC CONVERTER

HYBRID IC INDOOR FAN MOTOR VANE MOTOR VARISTOR ROOM TEMPERATURE THERMIST OR

INDOOR COIL THERMISTOR TERMINAL BLOCK CONTACTOR

WIRING DIAGRAM

MS-18NV -

INDOOR UNIT

O OUTDOOR

T UNIT CONNECTING

220-240V~

POWER SUPPLY CORD ~/N 220-240V 50Hz

CIRCUITBREAKER

MODEL WIRING DIAGRAM

GRN/YLW

BRN

BLU

BRN

F12

BLU

WHT

BLU

BRN

DSAR

RECEIVER P.C.BOARD

BLU

CN 101

GRN/YLW

REMOTE CONTROLLER

2 1

LD1

BLU

102

DISPLAY P.C.BOARD

HIC1

CN201

3 1

151

ELECTRONIC CONTROL P.C BOARD

52C

TRANS

F11

IC141

NR11

CN 112

121

CN211

C11

2 1

CN 111

RT12

BRN YLW GRY WHT RED BLK

RT11

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 -

OUTDOOR UNIT

SYMBOL

C1 C2

MODEL WIRING DIAGRAM

220-240V~

FROM INDOOR UNIT CONNECTING

GRN/YLW

NAME COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR

SYMBOL

WHT

NAME NAME FUSE(2A) COMPRESSOR(INNER THERMOSTAT)

BLU

RED ORN WHT BLU

WHT

1 2 3 4

RED ORN WHT BLK

SYMBOL

RED

BLK

OUTDOOR FAN MOTOR(INNER THEMOSTAT) 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.

Indoor unit

w Max. Height difference 5m

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

Outdoor unit

Refrigerant Piping

Max.length

Model

Outdoor unit precharged

1050

Refrigerant piping length (one way)

15m

120

10m

MS-18NV - E4

Model

Refrigerant piping

Max. length : m

Piping size O.D : mm

Length of connecting pipe : m

Indoor unit

Gas 0.43

Liquid 0.5

Gas

15.88

Liquid

6.35

Outdoor unit

Gas 0

Liquid 0

MS-18NV -

REFRIGERANT SYSTEM DIAGRAM

MS-18NV -

INDOOR UNIT

Indoor heat exchanger

Distributor

Room temperature thermistor RT11

Refrigerant pipe [15.88 (Option) (with heat insulator)

Indoor coil thermistor

RT12

Stop valve (with service port)

Flared connection

Stop valve

Refrigerant pipe [6.35 (Option)

(with heat insulator)

Accumulator

Capillary tube [3.0X[2.0X700

Compressor

Refrigerant flow in cooling

MU-18NV -

OUTDOOR UNIT

Outdoor heat

Strainer

exchanger

Unit:mm

MAX. REFRIGERANT PIPING LENGTH

MAX. HEIGHT DIFFERENCE

ADDITIONAL REFRIGERANT CHARGE(R-22 : g)

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

Wet and dry-bulb thermometers

Dry-bulb thermometers

PERFORMANCE CURVES

MS-18NV -

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

(2) AIR FLOW

Air flow should be set at MAX.

(3) MAIN READINGS

(1) Indoor intake air wet-bulb temperature :°CWB (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.

),50Hz

Cooling

}

INDOOR UNIT

OUTDOOR UNIT

MS-18NV - E4

15 20

25 60

30 70(%)

35(:)

0.3

0.4

0.5

0.6

0.7

18 32

220V/240V

15 20

25 60

30 70(%)

35(:)

220V/240V

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation

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

Dry-bulb temperature

20 25

Relative humidity(%)

50 60

30 70

Air flow should be set at MAX.

The 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/ff• G)

(kgf/F•G)(MPa•G)

MU-18NV -

Outdoor low pressure

MU-18NV -

Outdoor unit current(A)

Ambient temperature(˚C)Ambient humidity(%)

lighting not lighting

About 2 :  or more

Difference betweeen set temperature and room temperature

About 2 :  or less

This shows that the air conditioner is operating to reach the target temperature. Please wait unitil the target temperature is obtained.

This shows that the room temperature is approaching the target temperature.

Operation state

Indication

Operation Indicator

Operation Indicator lamp

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

INDOOR UNIT DISPLAY SECTION

MICROPROCESSOR CONTROL

WIRELESS REMOTE CONTROLLER

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

MS-18NV -

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

25: or more more than 13:,

less than 25:

● 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.

mode

COOL mode of

“I FEEL CONTROL“

DRY mode of

“I FEEL CONTROL”

Example

Previous operation

COOL mode of “I FEEL CONTROL” or COOL mode

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

Previous operation

COOL mode of “I FEEL CONTROL” or COOL mode

Restart

COOL mode of “I FEEL CONTROL”

Restart

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

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