Mitsubishi MSC-A07YV, MSC-A09YV, MSC-A12YV User Manual

SERVICE MANUAL

HFC

utilized

R410A

SPLIT-TYPE, AIR CONDITIONERS SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

Wireless type Models

(WH)

MSC-A07YV MSC-A09YV MSC-A12YV -

No. OB329

Indication of model name

MSC-A07YV MSC-A09YV MSC-A12YV -

NOTE:

•This manual describes technical data of indoor units.

•As for outdoor units MU-A07/A09/A12YV - , refer to the service manual OB330.

•As for outdoor units MUH-A07/A09/A12YV - , refer to the service manual OB331.

•As for outdoor units MUX-A10/A19/A20/A25/A26WV - , refer to the service manual OB307 REVISED EDITION-A.

•As for outdoor units MUX-A22WV - , refer to the service manual OB318.

•As for outdoor units MXZ-A18/A26/A32WV - , refer to the service manual OB319.

E1 E1 E1

CONTENTS

1. TECHNICAL CHANGES ····································3

2. PART NAMES AND FUNCTIONS······················3

3. SPECIFICATION·················································5

4. NOISE CRITERIA CURVES·······························6

5. OUTLINES AND DIMENSIONS·························7

6. WIRING DIAGRAM ············································8

7. REFRIGERANT SYSTEM DIAGRAM················8

8. MICROPROCESSOR CONTROL ······················9

9. SERVICE FUNCTIONS ····································17

10. TROUBLESHOOTING ······································19

11. DISASSEMBLY INSTRUCTIONS·····················26

12. PARTS LIST······················································28

TECHNICAL CHANGES

MSC-A07WV- ➔MSC-A07YV-

MSC-A09WV- ➔MSC-A09YVMSC-A12WV- ➔MSC-A12YV-

1. Design of front panel has changed.

2. Air filter has changed to the catechin air filter.

MSC-A07YV MSC-A09YV MSC-A12YV -

PART NAMES AND FUNCTIONS

E1E1

INDOOR UNIT

Air cleaning filter (white bellows type)

Panel

Catechin air filter (With deodorizer)

Air outlet

Vertical vanes

Fan

Horizontal vane

Operation section

(When the front panel is opened)

Front panel Air inlet

to Breaker

Power supply cord

Remote control receiving section

Remote controller

Display section

Emergency operation switch

Operation indicator lamp Remote control

receiving section

MSC-A07YV-

Installation plate Installation plate fixing screw 4 o 25 mm Remote controller holder Fixing screw for 3 3.5 o 16 mm Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) Air cleaning filter

1 5 1 2 2 1 1 1

ON/OFF

FAN

TOO

WARM

TOO

COOL

VANE

MODE

ECONO COOL

STOP

START

HR.

MIN.

I FEEL

COOL

DRY

CLOCK

RESET

CLOCK

HEAT /FAN

Open the front lid.

ON/OFF

TOO

COOL

TOO

WARM

Signal transmitting section

Operation display section

OPERATE /STOP

(ON /OFF)button

TEMPERATURE buttons

Indication of remote controller model is on back.

OPERATION SELECT button

FAN SPEED CONTROL button

OFF-TIMER button

HR. button

MIN. button

(TIME SET button)

ON-TIMER button

RESET button

ECONO COOL button

VANE CONTROL button

CLOCK SET button

MSC-A09YVMSC-A12YV-

E1 E1 E1

ACCESSORIES

REMOTE CONTROLLER

Indoor model

Function

Indoor unit power supply

Air flow(High/Med. /Low ) Power outlet Running current Power input Power factor Fan motor current Model Winding resistance(at 20:) Dimensions WOHOD Weight Air direction Sound level(High/Med. /Low ) Fan speed(High/Med. /Low ) Fan speed regulator Thermistor RT11(at 25:) Thermistor RT12(at 25:) Remote controller model

K /h

A W %

rpm

k" k"

MSC-A07YV -

Single phase

230V,50Hz

0.17 35 90

0.17

RC4V19-LA WHT-BLK 413 BLK-RED 334 815O278O244

9 5

3 10 10

KP1A or KG3A

Cooling

474/372 /276

36/31 /25

900/750 /600

Heating

510/420 /342

36/31 /25

950/820 /700

MSC-A09YV -

Single phase

230V,50Hz

0.17 35 90

0.17

RC4V19-LA WHT-BLK 413 BLK-RED 334 815O278O244

9 5

3 10 10

KP1A or KG3A

Cooling

474/384 /306

36/31 /25

900/770 /650

Heating

588/456 /342

39/32 /25

1,050/870 /700

MSC-A12YV -

Single phase

230V,50Hz

0.19 40 92

0.19

RC4V19-KA WHT-BLK 316 BLK-RED 299 815O278O244

3 10 10

KP1A or KG3A

Cooling

582/444 /324

40/33 /26

930/760 /600

Heating

606/498 /396

39/33 /26

960/830 /700

Electrical

data

Fan

motor

Special

remarks

Capacity

SPECIFICATION

NOTE: 1. Test conditions are based on ISO 5151.

Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C Outdoor DB35°C WB24°C OutdoorDB 7°C/WB 6°C Indoor-Outdoor piping length 5m

2.Remote controller model KP1A and KG3A are the same in terms of specification. W Reference value

63 125 250 500 1000 2000 4000 8000

APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

Test conditions,

Cooling : DB27: WB19: Heating : DB20: WB -:

MSC-A07YV- E1

COOL

High

FUNCTIONFAN SPEED

HEAT

SPL(dB

(A)) LINE

63 125 250 500 1000 2000 4000 8000

APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

Test conditions.

Cooling : DB27: WB19: Heating : DB20: WB -:

MSC-A09YV- E1

COOL

High

FUNCTIONFAN SPEED

HEAT 39

SPL(dB

(A)) LINE

63 125 250 500 1000 2000 4000 8000

APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR

BAND CENTER FREQUENCIES, Hz

Test conditions,

Cooling : DB27: WB19:

MSC-A12YV- E1

COOL

FUNCTIONFAN SPEED

HEAT

High

SPL(dB

(A)) LINE

INDOORUNIT

WALL

MICROPHONE

0.8m

NOISE CRITERIA CURVES

OUTLINES AND DIMENSIONS

MSC-A07YV MSC-A09YV -

INDOOR UNIT

278

162

Installation plate

Indoor unit

783

815

606

149

Power supply cord Lead to right 1.0m Lead to left 0.3m

81.5

Air in

Air out

326326

242 5

7 or more

110

244

133.5

231.5

2.5

81.5

Wall hole

Installation plate

Liquid line Gas line

{

Insulation

Drain hose (Connected part O,D)

Insulation

[65

[6.35-0.5m

[9.52-0.43m

[37 O.D

[21 I.D

[16

[28

4.5

271

Unit: mm

Wireless remote controller

MSC-A12YV -

INDOOR UNIT

278

162

Installation plate

783

815

606

Indoor unit

Air in

149

Power supply cord Lead to right 1.0m Lead to left 0.3m

Air out

242

7 or more

244

326326

Installation plate

Liquid line Gas line

{

Insulation

110

161.5161.5

17.5

258

218.5

2.5

81.581.5 Wall hole

[9.52-0.43m

Drain hose (Connected part O,D)

Insulation

[65

[6.35-0.5m

[37 O.D

[21 I.D

[16

[28

Wireless remote controller

SYMBOL

NR11 RT11 RT12

SR141

NAME

NAME NAME INDOOR FAN CAPACITOR FUSE(3.15A) INDOOR FAN MOTOR (INNER FUSE) VANE MOTOR

VARISTOR ROOM TEMPERATURE THERMIST OR INDOOR COIL THERMISTOR SOLID STATE RELAY

TERMINAL BLOCK

SYMBOL

C11 F11

SYMBOL

T11

TRANSFORMER

CIRCUIT BREAKER

SR141

C11

RED

WHT

BRN

YLW

GRY

BLK

121

1 3 5

111

112

RT12

RT11

NR11

F11

ELECTRONIC CONTROL P.C. BOARD

CN211

TAB12 CN201

3 2 1

CN202

2 1

151

BRN RED

BLU

WHT BLK

BLU

BRN

L 3 N 2 1

12V

TO OUTDOOR UNIT CONNECTING

POWER SUPPLY CORD ~/N 230V 50Hz

GRN/YLW

POWER MONITOR, RECEIVER P.C.BOARD

REMOTE CONTROLLER

FOR MUH OR MXZ TYPE

FOR MU OR MUX TYPE

12V

101

T11

GRN

LD103

WIRING DIAGRAM

MSC-A07YV - MSC-A09YV - MSC-A12YV -

INDOOR UNIT

MODELS WIRING DIAGRAM

E1E1E1

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

MSC-A07YV - MSC-A09YV -

INDOOR UNIT

Indoor heat exchanger

REFRIGERANT SYSTEM DIAGRAM

E1E1

Refrigerant pipe [9.52 (with heat insulator)

Indoor coil thermistor RT12

Flared connection

MSC-A12YV -

INDOOR UNIT

Indoor heat exchanger

Room temperature

Room temperature thermistor RT11

Refrigerant flow in cooling

Flared connection

Refrigerant pipe [6.35 (with heat insulator)

thermistor RT11

Indoor coil thermistor

Refrigerant flow in cooling

Refrigerant pipe [12.7 (with heat insulator)

RT12

Flared connection

Refrigerant pipe [6.35 (with heat insulator)

Unit:mm

ON/OFF

FAN

TOO

WARM

TOO

COOL

VANE

MODE

ECONO COOL

STOP

START

HR.

MIN.

I FEEL

COOL

DRY

CLOCK

RESET

CLOCK

HEAT /FAN

Open the front lid.

ON/OFF

TOO COOL

TOO

WARM

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

ECONO COOL button

VANE CONTROL button

CLOCK SET button

MICROPROCESSOR CONTROL

MSC-A07YV MSC-A09YV MSC-A12YV -

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.

WIRELESS REMOTE CONTROLLER

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 does not depend on the shape of lamp.

Operation Indicator

lighted not lighted

Difference between target

Operation stateIndication

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

temperature and room temperature

Approx. 2 :  or more

8-1. COOL ( ) OPERATION

(1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with the OPERATION SELECT button. (3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button)to select the desired temperature.

The setting range is 16 ~ 31°C

1. Thermostat control

Thermostat is ON or OFF by difference between room temperature and set temperature

Room temperature minus set temperature : 0.3 : or more················································ON Room temperature minus set temperature : less than -0.3 :············································OFF

2. Indoor fan speed control

Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button regardless of thermostat’s OFF-ON.

In Auto the fan speed is as follows.

Room temperature minus set temperature : 1.7 degrees or more·······························High Room temperature minus set temperature : Between 1 and 1.7 degrees···················Med. Room temperature minus set temperature : less than 1 degree··································Low

This shows that the room temperature is approaching the

Approx. 2 :  or less

target temperature.

Initial temperature difference Thermostat

Difference between room temperature and set temperature during operation

Set temperature

-0.3 :

0.3 :

Difference between room

Initial temperature difference

Fan speed

temperature and set temperature during operation

3 deg.

1.7 deg.

1 deg.

10 15 20 25 30 35

Set temperature

Initial room temperature

Set temperature and initial room temperature in dry mode

3. Coil frost prevention

① Temperature control

When the indoor coil thermistor RT12 reads 4°C or below(MSC-A07/A09YV) / 0°C or below(MSC-A12YV) for 5 minutes, the coil frost prevention mode starts.

The indoor fan operates at the set speed and the compressor stops for 5 minutes. After that, if RT12 still reads below 4°C (MSC-A07/A09YV) / 0°C (MSC-A12YV), this mode is prolonged until the RT12 reads over 4°C (MSC-A07/A09YV) / 0°C (MSC-A12YV).

② Time control

When the three conditions as follows have been satisfied for 1 hour and 45 minutes, the compressor stops for 3 minutes. The indoor fan operates at the set speed. a. Compressor has been continuously operating. b. Indoor fan speed is Low or Med. c. Room temperature is below 26°C. When compressor stops, the accumulated time is cancelled. When compressor restarts, time counting starts from the beginning. Time counting also stops temporarily when the indoor fan speed becomes High or the room temperature exceeds 26°C. However, when two of the above conditions (b.and c.) are satisfied again, time accumulation is resumed.

Operation chart

Example

Compressor

OFF

Outdoor fan

Indoor fan

( continuously at set speed)

8-2. DRY ( ) OPERATION

(1) Press OPERATE/STOP(ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with the OPERATION SELECT button. (3) The microprocessor reads the room temperature and determines the set tem-

perature. Set temperature is as shown on the right chart.

DRY operation will not function when the room temperature is 13°C or below. (4) When DRY operation functions the fan speed is lower than COOL operation

except at (fan speed) Low.

The system for dry operation uses the same refrigerant circuit as the cooling circuit. The compressor and the indoor fan are controlled by the room temperature.

1. Thermostat control

Thermostat is ON or OFF by difference between room temperature and set temperature.

Initial temperature difference Thermostat Room temperature minus set temperature : 0.3 : or more················································ON Room temperature minus set temperature : less than -0.3 :············································OFF

2. Indoor fan speed control

Indoor fan operates at the set speed by FAN SPEED CONTROL button. In Auto fan speed becomes Low.

3. The operation of the compressor and indoor / outdoor fan <MU-A07/A09/A12YV, MUH-A07/A09/A12YV, MUX-A10/A19/A20/A22/A25/A26WV>

Compressor operates by room temperature control and time control. Indoor fan and outdoor fan operate in the same cycle as the compressor.

● When the room temperature is 23°C or over:

When the thermostat is ON, the compressor repeats 8 minutes ON and 3 minutes OFF. When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.

● When the room temperature is under 23°C.

When the thermostat is ON, the compressor repeats 2 minutes ON and 3 minutes OFF. When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON.

OFF

Difference between room temperature and set temperature during operation

Set temperature

-0.3 :

0.3 :

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