Mitsubishi Electric MUZ-WR-NA Series Manual de usuario

Outdoor unit service manual

MUZ-WR•NA Series (OBH819)

PARTS CATALOG (OBB818)

MSZ-WR24NA

INDOOR UNIT

SERVICE MANUAL

INDOOR UNIT

Models

MSZ-WR09NA -U1 ,U2

MSZ-WR12NA -U1 ,U2

MSZ-WR18NA -U1

MSZ-WR24NA -U1

CONTENTS

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

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

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

4. OUTLINES AND DIMENSIONS·····················7

5. WIRING DIAGRAM·····································8

6. REFRIGERANT SYSTEM DIAGRAM···········10

7. SERVICE FUNCTIONS······························11

8. MICROPROCESSOR CONTROL ················13

9. TROUBLESHOOTING·······························17

10. DISASSEMBLY INSTRUCTIONS·················32

No. OBH818

REVISED EDITION-C

OBH818 REVISED EDITION-B is void.

Revision C:

• MSZ-WR09/12NA - U2 have been added.

1TECHNICAL CHANGES

MSZ-WR09NA - U1

MSZ-WR12NA - U1

MSZ-WR18NA - U1

MSZ-WR24NA - U1

1. New model

MSZ-WR09NA - U1 MSZ-WR09NA - U2

MSZ-WR12NA - U1 MSZ-WR12NA - U2

1. Indoor electronic control P.C. board and indoor power P.C. board have been changed.

Revision A:

• 3. SPECIFICATION has been corrected.

Use the specied refrigerant only

Never use any refrigerant other than that specified.

Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.

Correct refrigerant is specified in the manuals and on the spec labels provided with our products.

We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by failure to

follow the instructions.

Prepare the proper tools.

Prepare the proper protectors.

Provide adequate ventilation.

After stopping the operation of the air conditioner, turn off the power-supply breaker and pull the power plug.

Discharge the capacitor before the work involving the electric parts.

Do not perform the work involving the electric parts with wet hands.

Do not pour water into the electric parts.

Do not touch the refrigerant.

Do not touch the hot or cold areas in the refrigeration cycle.

When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to

touch the live parts.

WARNING

• When the refrigeration circuit has a leak, do not execute pump down with the compressor.

• When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.

The compressor may burst if air etc. get into it.

• When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap

between the valve stem and the valve body, resulting in injuries.

Revision B:

• 9-7. TEST POINT DIAGRAM AND VOLTAGE has been modified.

Revision C:

• MSZ-WR09/12NA - U2 have been added.

OBH818C

2PART NAMES AND FUNCTIONS

MSZ-WR09NA MSZ-WR12NA

Operation indicator lamp

Remote control receiving section

Emergency operation switch

Horizontal vane

Air outlet

Air ﬁlter

Air inlet

Heat exchanger

Front panel

Air cleaning ﬁlter

(Anti-Allergy Enzyme

Filter, option)

Remote controller

ACCESSORIES

Installation plate 1

Attachment screws for the installation plate

4 × 25 mm 5

Battery (AAA) for remote controller 2

Wireless remote controller 1

Felt tape (For left or left-rear piping) 1

OBH818C

MSZ-WR18NA MSZ-WR24NA

ACCESSORIES

Installation plate 1

Attachment screws for the installation

plate 4 × 25 mm 5

Wireless remote controller 1

Felt tape (For left or left-rear piping) 1

Battery (AAA) for remote controller 2

Remote controller

Operation indicator lamp

Remote control receiving section

Emergency operation switch

Horizontal vane

Air outlet

Air ﬁlter

Air inlet

Heat exchanger

Front panel

Air cleaning ﬁlter

(Anti-Allergy Enzyme

Filter, option)

OBH818C

3SPECIFICATION

Indoor model MSZ-WR18NA MSZ-WR24NA

Power supply V, phase, Hz 208/230, 1, 60

Max. fuse size (time delay)/ Disconnect switch

A 15

Min. circuit ampacity A 1.0

Fan motor F.L.A 0.67

Airow

Super High - High - Med. - Low

COOL Dry

(Wet)

CFM 625 - 530 - 431 - 328

(562 - 477 - 388 - 295) 702 - 530 - 431 - 353

(632 - 477 - 388 - 318)

HEAT Dry CFM 625 - 530 - 431 - 307 702 - 579 - 448 - 346

Moisture removal pt./h 2.1 2.3

Sound level

Super High - High - Med. - Low Cooling dB(A) 47 - 42 - 37 - 30 50 - 44 - 38 - 33

Heating dB(A) 47 - 42 - 37 - 30 50 - 44 - 38 - 32

Fan speed

Super High - High - Med. - Low Cooling rpm 1,140 - 1,000 - 850 - 690 1,250 - 1,000 - 850 - 730

Heating rpm 1,140 - 1,000 - 850 - 660 1,250 - 1,070 - 880 - 720

Cond. drain connection O.D. in. 5/8

Dimensions Win. 36-5/16

D 9-13/16

H 12

Weight Ib. 28

External nish Munsell 1.0Y 9.2/0.2

Control voltage (by built-in transformer) 12 - 24 V DC

NOTE: Test conditions are based on AHRI 210/240.

Indoor model MSZ-WR09NA MSZ-WR12NA

Power supply V, phase, Hz 208/230, 1, 60

Max. fuse size (time delay)/ Disconnect switch

A 15

Min. circuit ampacity A 1.0

Fan motor F.L.A 0.76

Airow

Super High - High - Med. - Low

COOL Dry

(Wet)

CFM 399 - 321 - 237 - 170

(364 - 286 - 201 - 134)

HEAT Dry CFM 406 - 321 - 237 - 170

Moisture removal pt./h 1.5 2.5

Sound level

Super High - High - Med. - Low Cooling dB(A) 43 - 37 - 30 - 22 45 - 37 - 30 - 22

Heating dB(A) 43 - 37 - 30 - 22

Fan speed

Super High - High - Med. - Low Cooling rpm 1,020 - 860 - 670 - 530

Heating rpm 1,040 - 860 - 670 - 530

Cond. drain connection O.D. in. 5/8

Dimensions Win. 31-7/16

D 9-1/8

H 11-5/8

Weight Ib. 22

External nish Munsell 1.0Y 9.2/0.2

Control voltage (by built-in transformer) 12 - 24 V DC

NOTE: Test conditions are based on AHRI 210/240.

OBH818C

(2) OPERATION

Mode Condition Intake air temperature (°F)

DB WB

Cooling

Standard temperature 80 67

Maximum temperature 90 73

Minimum temperature 67 57

Maximum humidity 78%

Heating Standard temperature 70 60

Maximum temperature 80 67

Minimum temperature 70 60

3-1. OPERATING RANGE

(1) POWER SUPPLY

Rated voltage Guaranteed voltage (V)

Indoor unit 208/230 V

1 phase

60 Hz

Min. 187 208 230 Max. 253

3-2. OUTLET AIR SPEED AND COVERAGE

● The air coverage is the figure up to the

position where the air speed is 1 ft./s.,

when air is blown out horizontally from

the unit properly at the High speed posi-

tion.

The coverage should be used only as a

general guideline since it varies accord-

ing to the size of the room and furniture

arranged inside the room.

Model Mode Function Airow

(CFM) Air speed

(ft./s.) Coverage

(ft.)

MSZ-WR09NA HEAT Dry 406 20.6 29.5

COOL Dry 321 16.3 23.5

Wet 286 14.5 21.0

MSZ-WR12NA HEAT Dry 406 20.6 29.5

COOL Dry 321 16.3 23.5

Wet 286 14.5 21.0

MSZ-WR18NA HEAT Dry 625 28.5 42.6

COOL Dry 625 28.5 42.6

Wet 562 25.6 38.4

MSZ-WR24NA HEAT Dry 702 32.0 47.7

COOL Dry 702 32.0 47.7

Wet 632 28.8 43.1

OBH818C

Unit: inch

MSZ-WR09NA MSZ-WR12NA

MSZ-WR18NA MSZ-WR24NA

4OUTLINES AND DIMENSIONS

Piping

Insulation

MSZ-WR24NA

Ø2 O.D

Liquid line Ø5/16 15-3/8 (Flared connection Ø3/8)

Gas line Ø15/32 13-3/8 (Flared connection Ø5/8)

Drain hose

Insulation Ø1-1/8 Connected part Ø5/8 O.D

Piping

Insulation

MSZ-WR18NA

Ø2 O.D

Liquid line Ø5/16 15-3/8 (Flared connection Ø1/4)

Gas line Ø15/32 13-3/8 (Flared connection Ø1/2)

Drain hose

Insulation Ø1-1/8 Connected part Ø5/8 O.D

11/16

5-1/2

2-1/4

2-1/2

9-13/16

3/16

35-13/16

36-5/16

1/4

27-15/16 6-5/16

2-1/16

2-9/16

2-13/16

2-1/2

2-9/16

3-11/16

2-1/16

9-7/16

10-5/16

1/8

8-7/8 8-7/8

3-11/16

8-3/4

10-3/8

2-5/16 15-7/8

8-11/16

3-11/16

7/8

1×7/16 Oblong hole

7/16×13/16

Oblong hole

Installation plate

Indoor unit

Wall hole Ø3

Air in

Installation plate

8-1/16

15-3/16

1-5/8

8-11/16

1-11/16

2-9/16

4-1/2

5-3/4

1/4

Air out

Piping

Drain hose

3-15/16

11/16

5-1/2

2-1/4

Piping

Insulation ø1 - 3/8 O.D

Liquid line ø1/4 19 - 11/16 (Flared connection ø1/4)

Gas line ø3/8 16 - 15/16

(Flared connection: ø3/8

Drain hose Insulation ø1-1/8 O.D Connected part ø5/8 O.D

OBH818C

5WIRING DIAGRAM

MSZ-WR09NA -U1 MSZ-WR12NA -U1

MSZ-WR09NA -U2 MSZ-WR12NA -U2

OBH818C

MSZ-WR18NA MSZ-WR24NA

OBH818C

MSZ-WR18NA MSZ-WR24NA

Unit: inch (mm)

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Flared connection

Refrigerant pipe ø1/2 (ø12.7) (MSZ-WR18NA)

(with heat insulator) ø5/8 (ø15.88) (MSZ-WR24NA)

Refrigerant pipe ø1/4 (ø6.35) (MSZ-WR18NA)

(with heat insulator) ø3/8 (ø9.52) (MSZ-WR24NA)

Indoor coil

thermistor

RT12 (main)

Indoor coil

thermistor

RT13 (sub)

Refrigerant flow in cooling

Refrigerant flow in heating

6REFRIGERANT SYSTEM DIAGRAM

Indoor

heat

exchanger

Flared connection

Room temperature

thermistor

RT11

Flared connection

Refrigerant pipe ø3/8 (ø9.52)

(with heat insulator)

Refrigerant pipe ø1/4 (ø6.35)

(with heat insulator)

Indoor coil

thermistor

RT12 (main)

Indoor coil

thermistor

RT13 (sub)

Refrigerant flow in cooling

Refrigerant flow in heating

MSZ-WR09NA MSZ-WR12NA

OBH818C

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