Mitsubishi Electric MS-18NV, MU-18NV, MS-18NV-E4, MS-18NV-E4WH, MU-18NV-E Service Manual

SERVICE MANUAL

SPLIT-TYPE AIR CONDITIONERS

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

Wireless type Models

MS-18NV -

(WH)

· MU-18NV -

E4E4

No. OB228

MS-18NV -

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)

E4E3

PART NAMES AND FUNCTIONS

INDOOR UNIT

Remote control receiving section

Air cleaning filter(option)

Deodorizing filter(option)

Grille

(When the grille is open)

MS-18NV -

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

MS-18NV -

OUTDOOR UNIT MU-18NV -

REMOTE CONTROLLER

NOTE:Test conditions

Cooling : Indoor DB27: / WB19:

Outdoor DB35: / WB24:

SPECIFICATION

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)

OUTLINES AND DIMENSIONS

MS-18NV -

MU-18NV -

OUTDOOR UNIT

INDOOR UNIT

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.

Unit : mm

WIRING DIAGRAM

MU-18NV -

MODEL WIRING DIAGRAM

OUTDOOR UNIT

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.

SYMBOL

C1 C2

SYMBOL

NAME

NAME NAME COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR

FUSE(2A) COMPRESSOR(INNER THERMOSTAT)

OUTDOOR FAN MOTOR(INNER THEMOSTAT) TERMINAL BLOCK

MS-18NV -

MODEL WIRING DIAGRAM

INDOOR 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

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

BLK

WHT

RED ORN

220-240V~

BLU

WHT

BLK

RED

WHT

ORN

RED

WHT

1 2 3

GRN/YLW

FROM INDOOR UNIT CONNECTING

CIRCUITBREAKER

50Hz

220-240V~

BRN

DSAR

GRN/YLW

LD1

REMOTE CONTROLLER

3 1

DISPLAY P.C.BOARD

101

102

151

ELECTRONIC CONTROL P.C BOARD

BLU

RECEIVER P.C.BOARD

F11

BLU

~/N 220-240V

CORD

POWER SUPPLY

O OUTDOOR UNIT CONNECTING

BRN

GRN/YLW

52C

BRN

CN201

F12

WHT

BLU

BLU BLU

TRANS

HIC1

111

4 2 1

C11

CN211

BLK

WHT

GRY RED

RT11

121

112

NR11

IC141

RT12

YLW

BRN

REFRIGERANT SYSTEM DIAGRAM

MS-18NV -

MU-18NV -

INDOOR UNIT

OUTDOOR UNIT

Indoor heat exchanger

Room temperature thermistor RT11

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

Flared connection

Indoor coil thermistor

RT12

Refrigerant pipe [6.35 (Option)

(with heat insulator)

Stop valve

Capillary tube [3.0X[2.0X700

Compressor

Accumulator

Stop valve (with service port)

Outdoor heat exchanger

Refrigerant flow in cooling

Strainer

Unit:mm

Distributor

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

MAX. HEIGHT DIFFERENCE

ADDITIONAL REFRIGERANT CHARGE(R-22 : g)

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 -

MAX. REFRIGERANT PIPING LENGTH

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

PERFORMANCE CURVES

Wet and dry-bulb thermometers

Dry-bulb thermometers

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 (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

}

Cooling

MS-18NV -

MS-18NV - E4

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

OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation

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)

Dry-bulb temperature

Relative humidity(%)

30 70

15 20

256030

70(%)

35(:)

0.3

0.4

0.5

0.6

0.7

18 32

220V/240V

15 20

256030

70(%)

35(:)

220V/240V

MU-18NV -

Ambient temperature(˚C)Ambient humidity(%)

Outdoor low pressure

(kgf/F•G)(MPa•G)

Outdoor unit current(A)

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.

MICROPROCESSOR CONTROL

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

Example

Previous operation

COOL mode of “I FEEL CONTROL” or COOL mode

● 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

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.

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.

MS-18NV -

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

Initial room temperature

25: or more more than 13:,

less than 25:

mode

COOL mode of

“I FEEL CONTROL“

DRY mode of

“I FEEL CONTROL”

WIRELESS REMOTE CONTROLLER

+ 22 hidden pages

Mitsubishi Electric MS-18NV, MU-18NV, MS-18NV-E4, MS-18NV-E4WH, MU-18NV-E Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual