Mitsubishi Electronics MS24WN User Manual

L

I

S

T

E

D

CUS

SPLIT-TYPE, AIR CONDITIONERS

Revision:

●PARTS LIST have been partially modified.

●Please void OB311.

SERVICE MANUAL

Wireless type Models

MS24WN (W) · MU24WN

No. OB311

REVISED EDITION-A

INDOOR UNIT Indication of model name MS24WN

OUTDOOR UNIT Indication of model name MU24WN

Remote controller

CONTENTS

1. FEATURES·························································3

2. PART NAMES AND FUNCTIONS······················4

3. SPECIFICATION·················································6

4. DATA···································································8

5. OUTLINES AND DIMENSIONS·······················12

6. WIRING DIAGRAM ··········································14

7. REFRIGERANT SYSTEM DIAGRAM··············15

8. MICROPROCESSOR CONTROL ····················16

9. SERVICE FUNCTIONS ····································25

10. TROUBLESHOOTING ······································27

11. DISASSEMBLY INSTRUCTIONS·····················40

12. PARTS LIST······················································44

13. OPTIONAL PARTS ······················BACK COVER

The Slim Line. From Mitsubishi Electric.

TM

Revision:

CAPILLARY TUBE (TAPER PIPE) [0.14X[0.09X1-31/32

E02 784 936

Part number

Part name

Model

MU24WN

Page

47

• Parts No. has been changed due to the color change of outdoor unit parts. WHITE➔NEW WHITE (Brighter)

• Capillary tube has been added to parts list.

1

SWING

LCD wireless remote controller

SWING

FEATURES

MS24WN

MU24WN

Model

MS24WN

Cooling capacity

22,800 Btu/h

SEER

10.5

“I FEEL CONTROL” IN OUR LCD WIRELESS REMOTE CONTROLLER WITH ON/OFF PROGRAM TIMER

Mitsubishi Electric’s new wireless remote controller incorporates a number of advanced features that provide even greater con-

trol and ease-to-use. It has a liquid crystal display which indicates such information as mode, fan speed and temperature selected as well as the programmed ON/OFF timer. It is also equipped with “I Feel Control”, a unique Mitsubishi Electric feature that allows the user to adjust the temperature to exactly the level he or she wants simply by tapping the button that describes present conditions : “Too Cool” or “Too Warm”. The optimum temperature set this way is then memorized for immediate recall whenever the air conditioner is used again.

Select desired air flow direction. REMOTE-CONTROL OPERATION MODE

Using the remote controller, you can select from five airflow set-

tings to match room layout and the location of people. Also, you can set the vane to swing automatically.

AUTO-RESTART FUNCTION

The auto restart function restarts the equipment automatically

when power is restored following an outage. Operation resumes in the mode in which the equipment was running just before the outage.

HIGH PERFORMANCE ROTARY COMPRESSOR

The advanced design of Mitsubishi Electric’s powerful and energy

efficient rotary compressor results in lower operating costs and longer service life.

3

2

Installation plate Installation plate fixing screw 4 x 25 mm(0.16 x 0.98 in.) Remote controller holder Fixing screw for 3 3.5 x 16 mm(0.14 x 0.63 in.) (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping)

1 7 1 2 2 1 1

1 2 3 4 5 6 7

MS24WN

PART NAMES AND FUNCTIONS

INDOOR UNIT

MS24WN

Grille

Deodorizing filter (option) (Gray sponge type)

Air cleaning filter (option) (White bellows type)

Front panel

Air filter

Vertical vane

Operation section

(When the grille is opened)

Emergency operation switch

Air inlet

Remote control receiving section

Horizontal vane

Remote controller

Display section

Operation indicator lamp

Operation Indicator

Receiving section

ACCESSORIES

OUTDOOR UNIT

MU24WN

4

REMOTE CONTROLLER

ON/OFF

TOO

COOL

PM

AM

TOO

WARM

ON/OFF

FAN

TOO

WARM

TOO

COOL

VANE

MODE

STOP

START

HR.

MIN.

WIDE VANE

LONG

I FEEL

COOL

DRY

PM

CLOCK

AM

RESET CLOCK

FAN

Open the front lid.

Signal transmitting section

Operation display section

OPERATE/ STOP

(ON/ OFF)button

TEMPERATURE buttons

OPERATION SELECT button

FAN SPEED CONTROL button

OFF-TIMER button

HR. button

MIN. button

(TIME SET button)

ON-TIMER button

RESET button

VANE button

(Horizontal vane button)

CLOCK SET button

LONG button

WIDE VANE button

(Vertical vane button)

MS24WN

5

3

Item

Model

Cooling capacity Power consumption EER [SEER] INDOOR UNIT MODEL External finish Power supply Max. fuse size (time delay)/ Disconnect switch Min. ampacity Fan motor

Airflow Low—Med.—High Moisture removal

Sound level Low-Med.-High Cond. drain connection O.D.

Dimensions Weight

OUTDOOR UNIT MODEL External finish Power supply Max. fuse size (time delay) Min. ampacity Fan motor

Compressor

Refrigerant control Sound level

Dimensions Weight

REMOTE CONTROLLER Control voltage (by built-in transformer) REFRIGERANT PIPING Pipe size (Min. wall thickness)

Connection method Between the indoor

& outdoor units Refrigerant charge (R22) Refrigerant oil

(Model)

FAN Dry COOL Dry(Wet)

W D H

Model Winding resistance (at 68˚F) Ω

W D H

Liquid Gas Indoor Outdoor Height difference Piping length

Btu/h

W

A A

F.L.A

CFM CFM

p

t./h

dB(A

) in. in. in. in. lb.

A A

F.L.A

R.L.A L.R.A

dB(A

) in. in. in. lb.

in. in.

ft. ft.

oz.

22,800

2,170

10.5 (10.5) MS24WN

White

115V 60Hz 1[

15

1.1

0.82

431-491-565

402(346)-484(417)-565(487

)

7.6

39-43-47

5/8 43-5/16 8-15/16

12-13/16

40

MU24WN

Munsell 5Y7/1

208/230V 60Hz 1[ 3 wires

25 22

0.87

PH33NPBT

C-R 0.84 C-S 2.09

16 58

Linear expansion valve

55 34-1/4 11-5/8 33-1/2

152

Wireless type

12V DC

Not supplied (optional parts)

3/8 (0.0285

)

5/8 (0.0315

) Flared Flared

Max. 25 Max. 50

4 Ib. 5 oz.

27.9

(

MS32N1

)

MS24WN

❈1 ❈1

❈1

❈2

Cooling

Maximum

Minimum

Indoor intake air temperature

95˚FDB, 71˚FWB 67˚FDB, 57˚FWB

Outdoor intake air temperature

115˚FDB

67˚FDB

SPECIFICATION

Notes : Test conditions are based on ARI 210/240

❈1 : Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, (75˚FWB) ❈2 : Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 82˚FDB, 65˚FWB

Operating Range

6

w Height difference

should be within 25ft. regardless of which unit, indoor or outdoor position is high.

w Max. Height

difference 25ft.

Additional Piping Max. length

A

Indoor unit

Outdoor unit

Outside

diameter

Minimum

Wall

thickness

Outside

diameter

Minimum

Wall

thickness

MS24WN MU24WN

Additional piping

Max. length : ft.

A

50

Gas

Piping size : in. Length of connecting pipe : in.

Liquid

Indoor unit

Outdoor unit

Model

Gas :

Liquid :00

Gas :

Liquid :

16-15/16 19-11/16

[ 5/8

[ 3/8

0.0315 0.0285

MAX. REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE

MAX. HEIGHT DIFFERENCE

7

4

Model

Refrigerant piping length (one way)

1.0

25ft. (std.)

0.954

40ft.

0.923

50ft.

MS24WN

Model

Indoor air

Outdoor intake air DB temperature(˚F

)

71 67 63

TC

27.9

26.4

24.9

SHC

13.9

16.7

19.0

TPC

1.93

1.82

1.74

TC

26.1

24.6

23.0

SHC

13.0

15.5

17.6

TPC

2.12

2.01

1.92

TC

24.5

22.8

21.4

SHC

12.2

14.4

16.4

TPC

2.28

2.17

2.07

TC

22.8

21.2

19.5

SHC

11.3

13.4

14.9

TPC

2.40

2.30

2.21

TC

21.0

19.5

17.8

SHC

10.4

12.3

13.6

TPC

2.50

2.41

2.30

IWB (˚F)

75

85 95

105

115

MS24WN

(208V/ 230V)

Notes 1. IWB : Intake air wet-bulb temperature. TC : Total Capacity (x10

3

Btu/h), SHC : Sensible Heat Capacity (x10

3

Btu/h)

TPC : Total Power Consumption (kW)

2. SHC is based on 80˚F of indoor intake air DB temperature.

16

18

20

22

24

26

28

30

65 70 75 80 85 90 95 100 105 110 115

1.4

1.6

1.8

2.0

2.2

2.4

2.6

71 67 63

Total power consumption (kW) Total capacity ( ✕10 Btu/h)

Outdoor intake air DB temperature (°F)

Indoor intake air WB temperature (°F)

Indoor intake air WB temperature (

°F)

Cooling

SHF at rating condition = 0.63

= 487CFM = 0.16

Airflow

Bypass Factor

208V/230V

DATA

4-1. PERFORMANCE DATA

1) COOLING CAPACITY

MS24WN MU24WN

2) COOLING CAPACITY CORRECTIONS

4-2. PERFORMANCE CURVE

MS24WN MU24WN

8

4-3. Condensing pressure

70 75 80 85 90 95 100 104(°F)

40

50

60

70

80

90

100

70 75 80 85 90 95 100 104(°F)

160

180

200

220

240

260

280

300

86 80

75 70

Condensing pressure

Outdoor ambient temperature

(PSIG)

86 80 75 70

Indoor DB temperature

(PSIG)

68

Suction pressure

Outdoor ambient temperature

68

Data is based on the condition of indoor humidity 50%. Air flow should be set at High.

MU24WN

9

•Both wirings can be applied.

MS24WN

INDOOR UNIT

115V 60Hz 1[, 2wires

OUTDOOR UNIT

208/230V 60Hz 1[, 3 wires

SIGNAL WIRE 2 wires 12V DC

OUTDOOR UNIT

208/230V 60Hz 1[, 3 wires

115V 60Hz 1[, 2 wires

Disconnect switch SIGNAL WIRE

2 wires 12V DC

115V

4-4. STANDARD OPERATION DATA

MS24WN

Cooling

22,800

0.63

2.17

MS24WN

115V 60Hz 1[

0.071

0.62

MU24WN

208/230V 60Hz 1[

2.099

9.36/ 8.30

0.67/0.71 250

71 174 115

48 158

25

4 Ib. 5 oz.

80

67

51

50

1,280

487(Wet)

95

—

750/820

1,589/1,765

Capacity SHF Input INDOOR UNIT MODEL Power supply Input Fan motor current OUTDOOR UNIT MODEL Power supply Input Comp. current Fan motor current Condensing pressure Suction pressure Discharge temperature Condensing temperature Suction temperature Comp. shell bottom temp Ref. pipe length Refrigerant charge (R22)

Intake air temperature

Discharge air temperature

Fan speed (High) Airflow (High)

Intake air temperature

Fan speed Airflow

Unit

Btu / h

—

kW

A

kW

A

A PSIG PSIG

˚F ˚F ˚F ˚F ft. — ˚F ˚F ˚F ˚F

rpm

CFM

˚F ˚F

rpm

CFM

DB

WB

DB

WB

DB

WB

Item

Model

Total

Electrical circuit

Refrigerant circuit

Indoor unit

Outdoor unit

POWER SUPPLY

10

✻ Control voltage

Power supply voltage to serial signal circuit is 12V DC. Voltage between 11+ and 33--

on in-out terminal block will be 12V DC peak.

Model

MS24WN

Mode

FAN

COOL

565 487

Air flow

(CFM)

Air speed

(ft./sec.)

Coverage range (ft.)

Function

Dry

Wet

34.2

29.4

20.1

17.2

MS24WN MU24WN

Outdoor unit

precharged (up to 25ft.)

4 lb. 5 oz.

25ft.

0

30ft.

0.81

35ft.

1.62

Refrigerant piping length (one way)

40ft.

2.43

45ft.

3.24

50ft.

4.05

Model

CALCULATION : Xoz. = 0.81/ 5oz./ft. x (Additional Piping Length-25) ft.

Function

Cooling

Standard temperature Maximum temperature Minimum temperature

Maximum humidity

DB (˚F)

80 95 67

WB (˚F)

67 71 57

Indoor

78%

DB (˚F)

95

115

67

WB (˚F)

— — —

Outdoor

—

Condition

Intake air temperature

4-5. OPERATING RANGE

Indoor unit

Outdoor unit

Rating

115V 60Hz 1[

208/230V 60Hz 1[

Guaranteed Voltage

MS24WN

MU24WN

Model

Min. 103V

Max. 127V

115V

Min. 198V Max. 253V

208V

230V

(1) POWER SUPPLY

(2) OPERATION

4-6. OUTLET AIR SPEED AND COVERAGE RANGE

● The air coverage range is the figure up to the position where the air speed is 1 ft./sec., when air is blown out horizontally from the unit properly at the High speed position. The coverage range should be used only as a general guideline since it varies according to the size of the room and furniture arranged in the room.

4-7. ADDITIONAL REFRIGERANT CHARGE (R22(oz.))

11

5

6-3/8

3/4

2-5/16

1-7/8

5/16

12-3/8

10-1/161-7/8

1/8

3-7/8

6-13/16

16-5/16 16-5/16

3/168-7/8

8-15/16

9-15/16

31-1/8

2-3/16

42-1/16

43-5/16

12-13/16

Air out

Air in

Insulation [ 1-1/8

Drain hose [5/8 (Connected part O.D)

{

Liquid line [ 3/8 19-11/16 Gas line [ 3/4 16-15/16 Insulation [ 1-15/16 O.D

[ 1-1/4 I.D

Installation plate

Wall hole [ 2-15/16

Wireless remote controller

Installation plate

Indoor unit

OUTLINES AND DIMENSIONS

MS24WN

INDOOR UNIT

Unit: inch

12

MU24WN

Unit: inch

OUTDOOR UNIT

Air intake

Outlet guide installation hole

Handle for moving

A

17-3/8

7-1/18 20-5/8

1-9/16

Drain hole [1-5/16

7-9/32

Air outlet

11-7/8

2-1/2o7/8 Oval holes

19-11/16

34-1/4

20-5/8

(standard bolt M10)

Air intake

7-9/32

18-7/18

4-1/8

Outdoor Unit-Necessary surrounding clearance

11/16

13

14-1/4

1-9/16 1-1/16

9/16

Terminal block for power line Terminal block for indoor and outdoor unit connection

Handle for moving Service panel

Refrigerant-pipe flared

33-1/2

connection [5/8

21-3/4

Refrigerant-pipe flared

17-17/32

2-3/8

1-5/16

Bottom piping hole

1-5/8

connection [3/8

17-23/32

Knock out hole for front piping

(refrigerant,drainage and wiring)

Knock out hole

1-3/4

for right piping (refrigerant,drainage

and wiring)

2-3/8 4-3/4

13/32

Front opening

13/32

19-11/16

1-3/4

2-1/16

Knock out holes for power line 2-[1-1/16

7-7/8

Note:Allow adequate upper clearance

13/32

5-29/32

19-11/16

Service space

Drain hole [1-5/16

Handle for moving

5-7/16

Rear piping hole

3-3/4

Outdoor Unit-Necessary surrounding clearance (Concentrated installation)

13/32

4

For 10 units or less

The upper side must be open.

7-7/8

39-3/8

2-U-shaped notched holes

Side air intake

Rear fresh air intake

9/32

A

11-5/8

15/16

Conduit hole

NOTE: Do not wire12V DC and

115V AC in same conduit hole.

15/16

1/2

R1/4

1-5/16

R13/16

11/16

Front right piping holesdetail figures

2-9/16

R13/16

1 max.

3-1/8

Standard bolt length

13

6

SYMBOL

TB2 T61 X52 52C

SYMBOL

MF NR61 RT62 RT63 SR61

TB1

SYMBOL

C1 C2

DSAR

F61

LEV

MC

NAME

NAME NAME COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE(3.15A) EXPANSION VALVE COIL COMPRESSOR(INNER PROTECTOR)

OUTDOOR FAN MOTOR(INNER PROTECTOR)

VARISTOR

DISCHARGE TEMPERATURE THERMIST OR

AMBIENT TEMPERA TURE THERMIST OR SOLID STATE RELAY TERMINAL BLOCK

TERMINAL BLOCK TRANSFORMER

COMPRESSOR AUXILIARY RELAY

COMPRESSOR CONTACTOR

TAB12

POWER

FROM OUTDOOR UNIT CONNECTING WIRES

TO OUTDOOR UNIT CONNECTING WIRE

SUPPLY 115V 1 phase 60Hz

CN201

RT13

121

CN

CN211

CN112

TO OUTDOOR UNIT CONNECTING WIRES 12V DC

3

F11

VLT

1-

3+

15

3

REMOTE CONTROLLER

MV2 MV2 MV1

BLK GRY

TRANS

HIC1

C11

N

L1

BLK

ORN

WHT

BRN

YLW

RED

ELECTRONIC CONTROL P.C. BOARD

NR11

RED

MF

RT12

CN 151

CN 101

3

DISPLAY P.C.BOARD

RECEIVER P.C.BOARD

CN 102

SR141

1 3 4

4 3 2 1

RT11

111

CN

1 2 3 4

TB

w

(

)

w A disconnect may be required by local code.

SYMBOL

RT12 RT13

SR141

TB

SYMBOL

MV1

MV2 NR11 RT11

SYMBOL

C11

F11

HIC1

MF

NAME

NAME NAME INDOOR FAN CAPACITOR FUSE(3.15A) DC/DC CONVERTER INDOOR FAN MOTOR (INNER PROTECTOR)

VANE MOTOR(HORIZONTAL) VANE MOTOR(VERTICAL) VARISTOR ROOM TEMPERATURE THERMIST OR

INDOOR COIL THERMISTOR(MAIN) INDOOR COIL THERMISTOR(SUB) SOLID STATE RELAY TERMINAL BLOCK

WIRING DIAGRAM

MS24WN

MODEL WIRING DIAGRAM

INDOOR UNIT

NOTE:1. About the outdoor side 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

SG79J618H02

MU24WN

MODEL WIRING DIAGRAM

OUTDOOR UNIT

FROM INDOOR UNIT CONNECTING WIRE

FROM INDOOR UNIT CONNECTING WIRES 12V DC

TO INDOOR UNIT CONNECTING WIRES 115V 1 phase 60Hz

POWER SUPPLY 208/230V 1 phase 60Hz

GROUND

NOTE:1. About the indoor side electric wiring, refer to the indoor unit electric wiring diagram for servicing.

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

3. Symbols below indicate; : Terminal block, : Connector

TB2

3

1

N

L1

TB1

L1

N

L2

+

-

BLK

RED

GRN/YLW

OUTDOOR ELECTRONIC CONTROL P.C. BOARD

RED

BLU

DSAR

14

RT62 RT63

CN662 CN724

X52

T61

LEV

6

SR61

A2 A1

52C

MF

WHTWHT

BLK

ORN

RED

3456

21

RED

C2

ORN

3

CN711

TAB52

X52

COM

NO

F61

ORN VLT BLU RED

CN730

WHT

RED BLK

1 3 5 7

NR61

1

2

52C

C1

12

BLK

C

S

MC

SG79J606H02

BLU

R

7

Indoor heat exchanger

Outdoor heat exchanger

Flared connection

Room temperature thermistor RT11

Indoor coil thermistor RT13(sub)

Discharge temperature thermistor RT62

Flared connection

Stop valve

Stop valve (with service port)

Capillary tube O.D.0.14✕I.D.0.09✕1-31/32

Refrigerant flow in cooling

Compressor

Refrigerant pipe [5/8 (with heat insulator)

Refrigerant pipe [3/8 (with heat insulator)

Indoor coil thermistor RT12(main)

LEV

Strainer

Accumulator

Ambient temperature thermistor RT63

Strainer

#50

Capillary tube O.D.0.16✕I.D.0.09✕7-7/8 (Upper path)

Capillary tube O.D.0.16✕I.D.0.09✕3-15/16 (Lower path)

SERVICE PORT

FUSIBLE PLUG

#100

REFRIGERANT SYSTEM DIAGRAM

Unit: inch

MS24WN

INDOOR UNIT

MU24WN

OUTDOOR UNIT

15