OB449A.qxp 06.5.9 11:13 AM Page 1

Revision : A

● MU-A12WA-

1 has been added.

Please void OB449.

SPLIT-TYPE AIR CONDITIONERS

OUTDOOR UNIT

SERVICE MANUAL

Wireless type

Models

MU-A09WA

MU-A12WA

MU-A12WA-

1

HFC utilized

R410A

No. OB449

REVISED EDITION-A

Indoor unit service manual

MS-A•WA Series (OB448)

MU-A09WA

MU-A12WA

NOTE:

This service manual describes technical data of the outdoor units.

RoHS compliant products have <G> mark on the spec name plate.

For servicing of RoHS compliant products, refer to the RoHS PARTS

LIST (RoHS compliant).

CONTENTS

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

2. PART NAMES AND FUNCTIONS······················5

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

4. OUTLINES AND DIMENSIONS ·························8

5. WIRING DIAGRAM ············································9

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

7. DATA·································································12

8. TROUBLESHOOTING······································16

9. DISASSEMBLY INSTRUCTIONS ····················17

10. PARTS LIST······················································22

10-1. PARTS LIST·············································22

10-2. RoHS PARTS LIST ··································24

TM

OB449A.qxp 06.5.9 11:13 AM Page 2

Revision : A

• MU-A12WA-

1 has been added.

1 TECHNICAL CHANGES

MU09TW

➔

MU-A09WA

MU12TN

➔

MU-A12WA

1.Outdoor unit model has been changed.

2.Refrigerant has been changed. (R22 ➔ R410A)

3.Compressor has been changed.

MUA12WA

➔

MU-A12WA-

1

1.WIRING DIAGRAM has been changed.

INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT

• This room air conditioner adopts HFC refrigerant (R410A) which never destroys the ozone layer.

• Pay particular attention to the following points, though the basic installation procedure is same as that for R22 air conditioners.

1

As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/ materials are required. Refer to the table below.

2

Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and installation, since it is more susceptible to contaminations than R22.

3

For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant piping.)

4

Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent composition change.

Refrigerant

Composition (Ratio)

Refrigerant handling

Chlorine

Safety group (ASHRAE)

Molecular weight

Boiling point (

°

F)

Steam pressure [77

°

F](PSIG)

Saturated steam density [77

°

F](lb/ft 3 )

Combustibility

ODP w

1

GWP w

2

Refrigerant charge method

Additional charge on leakage

Kind

Color

Smell w 1 :Ozone Destruction Parameter : based on CFC-11 w

2 :Global Warmth Parameter : based on CO

2

New refrigerant

R410A

HFC-32: HFC-125 (50%:50%)

Pseudo-azeotropic refrigerant

Not included

A1/A1

72.6

-60.5

225.82

3.995

Non combustible

0

1730

From liquid phase in cylinder

Possible

Incompatible oil

Non

Non

Previous refrigerant

R22

R22 (100%)

Single refrigerant

Included

A1

86.5

-41.4

136.34

2.772

Non combustible

0.055

1700

Gas phase

Possible

Compatible oil

Light yellow

Non

2

OB449A.qxp 06.5.9 11:13 AM Page 3

New Specification Current Specification

The incompatible refrigeration oil easily separates from refrigerant and is in the upper layer inside the suction muffler.

Raising position of the oil back hole enables to back the refrigeration oil of the upper layer to flow back to the compressor.

Suction muffler

Since refrigerant and refrigeration oil are compatible each, refrigeration oil goes back to the compressor through the lower position oil back hole.

Suction muffler

Compressor

Oil back hole refrigeration oil

Compressor

Oil back hole

Refrigerant

Conversion chart of refrigerant temperature and pressure

580

508

435

363

290

218

145

73

0

R410A

R22

-73

-22 -4 14 32 50 68 86 104 122 140 ( ° F) refrigeration oil /Refrigerant

3

OB449A.qxp 06.5.9 11:13 AM Page 4

1.Tools dedicated for the air conditioner with R410A refrigerant

The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.

R410A tools Can R22 tools be used?

Gauge manifold

Charge hose

Gas leak detector

Torque wrench

Flare tool

Flare gauge

Vacuum pump adapter

Electronic scale for refrigerant charging

No

No

No

Yes

No

Yes

New

New

New

Description

R410A has high pressures beyond the measurement range of existing gauges.

Hose material have been changed to improve the pressure resistance.

Dedicated for HFC refrigerant.

1/4in. and 3/8in.

1/2in. and 5/8in.

Clamp bar hole has been enlarged to reinforce the spring strength in the tool.

Provided for flaring work (to be used with R22 flare tool).

Provided to prevent the back flow of oil. This adapter enables you to use vacuum pumps.

It is difficult to measure R410A with a charging cylinder because the refrigerant bubbles due to high pressure and high-speed vaporization

No : Not Substitutable for R410A Yes : Substitutable for R410A

2.Refrigerant piping

1

Specifications

Use the copper or copper-alloy seamless pipes for refrigerant that meet the following specifications.

Outside diameter(in) Wall thickness (in)

1/4

3/8

1/2

5/8

0.0315

0.0315

0.0315

0.0394

Insulation material

Heat resisting foam plastic

Specific gravity 0.045 Thickness 0.315 in

2

Flaring work and flare nut

Flaring work for R410A pipe differs from that for R22 pipe.

For details of flaring work, refer to Installation manual “FLARING WORK”.

Pipe diameter inch

1/4

3/8

1/2

5/8

R410A

17 (11/16)

22 (7/8)

26 (1-1/32)

29 (1-5/32)

Dimension of flare nut mm(in.)

R22

17 (11/16)

22 (7/8)

24 (15/16)

27 (1-1/16)

4

OB449A.qxp 06.5.9 11:13 AM Page 5

3.Refrigerant oil

Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.

4.Air purge

• Do not discharge the refrigerant into the atmosphere.

Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant circuit.

• Use the vacuum pump for air purging for the purpose of environmental protection.

5.Additional charge

For additional charging, charge the refrigerant from liquid phase of the gas cylinder.

If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and the outdoor unit. In this case, ability of the refrigeration cycle decreases or normal operation can be impossible. However, charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.

Union

Stop valve

Indoor unit

Liquid pipe

Gas pipe

Outdoor unit

Refrigerant gas cylinder operating valve

Service port

Gauge manifold valve (for R410A)

Charge hose (for R410A)

Refrigerant gas cylinder for R410A with siphon

Refrigerant (liquid)

Electronic scale for refrigerant charging

2 PART NAMES AND FUNCTIONS

MU-A09WA MU-A12WA

Air inlet

(back and side)

Piping

Drain hose

Air outlet

Drain outlet

5

Air inlet

(back and side)

Piping

Drain hose

Air outlet

Drain outlet

OB449A.qxp 06.5.9 11:13 AM Page 6

3 SPECIFICATION

Item

Capacity

Rated(Minimum~Maximum)

Power consumption

Rated(Minimum~Maximum)

Cooling

Cooling

❈ 2 Cooling

OUTDOOR UNIT MODEL

❈ 1

❈ 1

External finish

Power supply

Max. fuse size (time delay)

Min. circuit ampacity

Fan motor

Model

Btu/h

W

Compressor

Model

Winding resistance (at 68˚F)

Ω

R.L.A

L.R.A

Refrigerant control

Sound level

Dimensions

W

D

H

Weight

REMOTE CONTROLLER

REFRIGERANT PIPING

Refrigerant pipe size Liquid

(Min. wall thickness) Gas dB(A) in.

in.

in.

Ib.

in.

in.

Connection method

Indoor

Outdoor

Between the indoor

& outdoor units

Height difference

Piping length

Refrigerant charge (R410A)

Refrigerating oil (Model)

V, phase, Hz

A

A

F.L.A

ft.

ft.

cc

MS-A09WA

9,500

870

MS-A12WA

12,000

1,070

10.9 [13.0]

MU-A09WA

11.2 [13.0]

MU-A12WA

15

14

0.63

RN092WHDHT

C-R 0.81 C-S 1.49

9.30

47

Munsell 3Y 7.8/1.1

115, 1, 60

20

16

0.926

RN110WHDHT

C-R 0.66 C-S 1.23

10.82

56

Capillary tube

47

31-1/2

11-1/4

21-5/8

78

52

33-7/16

11-7/16

23-13/16

96

Wireless type

Not supplied

1/4 (0.0315)

3/8 (0.0315) 1/2 (0.0315)

2lb.5oz.

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

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

Flared

Flared

35

65

350 (NE022)

3lb. 1oz.

6

OB449A.qxp 06.5.9 11:13 AM Page 7

❈ 2

Mode Test

ARI SEER

(Cooling)

"A" Cooling Steady State at rated compressor Speed

"B-2" Cooling Steady State at rated compressor Speed

"B-1" Cooling Steady State at minimum compressor Speed

Low ambient Cooling Steady State at minimum compressor Speed

Intermediate Cooling Steady State

At Intermediate compressor Speed

Indoor air condition

Dry bulb Wet bulb

80 67

80

80

80

80

67

67

67

67

Operating Range

Cooling

Maximum

Minimum

Indoor intake air temperature

95˚FDB, 71˚FWB

67˚FDB, 57˚FWB

Outdoor intake air temperature

115˚FDB

67˚FDB

(Unit : [˚F])

Outdoor air condition

Dry bulb Wet bulb

95

82

82

67

87

(75)

(65)

(65)

(53.5)

(69)

7

OB449A.qxp 06.5.9 11:13 AM Page 8

4 OUTLINES AND DIMENSIONS

MU-A09WA

REQUIRED SPACE

15-3/4

Air in

Drainage hole 1-5/8

4 in.

or more Air in

7/8 handle

Air out

1-9/16

2- 3/8 o

13/16 Oval hole

29/32 11-1/4 17/32

8 in

. or m ore

Open two sides of left, right, or rear side.

Unit : inch

Basically open 4inch or more without any obstruction in front and on both sides of the unit.

4 in.

or more

14 in.

or m ore

6-23/32

Liquid pipe : 1/4 (flared)

Gas pipe : 3/8 (flared)

5-15/16

11-29/32

19-11/16

31-1/2

MU-A12WA

Drainage hole [ 5/8

13-31/32

13-3/4

Air in

13/16

2-23/32

REQUIRED SPACE

4 in.

or more

Air in

Drainage

3holes [ 1-5/16

Air out

7-3/16

19-11/16

33-7/16

1-15/16

1-3/16

20 in

. or m ore

Service panel

Liquid refrigerant pipe joint

Refrigerant pipe

(flared) [ 1/4

35

30

6-5/16

Gas refrigerant pipe joint

Rfrigerant pipe

(flared) [ 1/2

3-3/16

2-1/4

8

4 in.

or more

14 in.

or m ore

OB449A.qxp 06.5.9 11:13 AM Page 9

5 WIRING DIAGRAM

MU-A09WA

MU-A12WA

9

OB449A.qxp 06.5.9 11:14 AM Page 10

MU-A12WA-

1

6 REFRIGERANT SYSTEM DIAGRAM

MU-A09WA

Refrigerant pipe

{ 3/8

(with heat insulator)

Stop valve

(with service port)

Flared connection

Service port

Muffler

Service port

Compressor

Outdoor heat exchanger

Unit : inch (mm)

Strainer

#100

Flared connection

Refrigerant pipe

Stop valve

(Option) { 1/4

(with heat insulator)

Capillary tube

O.D. 0.118 x I.D. 0.055 x 21-21/32

( { 3.0 x { 1.4 x 550)

Refrigerant flow in cooling

10

OB449A.qxp 06.5.9 11:14 AM Page 11

MU-A12WA

Refrigerant pipe

{ 1/2

(with heat insulator)

Stop valve

(with service port)

Service port

Muffler

Service port Outdoor heat exchanger

Flared connection

Strainer

#100

Compressor

Flared connection

Stop valve

Refrigerant pipe

(Option) { 1/4

(with heat insulator)

Capillary tube

O.D. 0.118 x I.D. 0.063

x 27-9/16

( { 3.0 x { 1.6 x 700)

Refrigerant flow in cooling

MAX. REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE

Refrigerant piping : ft Piping size : in.

Gas

Model

Additional piping

Max. length

A

Additional piping

Max. length

B

Outside diameter

Minimum

Wall thickness

Outside diameter

MU-A09WA

65 35

[ 3/8

0.0315

[ 1/4

MU-A12WA [ 1/2

Liquid

Minimum

Wall thickness

0.0315

MAX. HEIGHT DIFFERENCE

Indoor unit

Max. Height difference

B

Additional Piping

Max. length

A

Outdoor unit

ADDITIONAL REFRIGERANT CHARGE(R410 : oz.)

Model Outdoor unit precharged

25ft 30ft

Refrigerant piping length (one way)

35ft 40ft 45ft 50ft 55ft

MU-A09WA

MU-A12WA

2lb. 5oz.

3lb. 1oz.

0 1.08

2.16

3.24

4.32

5.40

6.48

60ft

7.56

65ft

8.64

NOTE : Calculation : Xoz.=1.08/5oz./ft ✕ (Refrigerant piping length (ft)-25)

11

OB449A.qxp 06.5.9 11:14 AM Page 12

7 DATA

MS-A09WA MS-A12WA

7-1. PERFORMANCE DATA

1) COOLING CAPACITY

Model

MS-A09WA

MS-A12WA

Indoor air

IWB

(˚F)

71

67

63

71

67

63

TC

11.6

11.0

10.4

14.7

13.9

13.1

75

SHC TPC

6.4

7.5

8.4

8.3

9.7

10.9

0.77

0.73

0.70

0.95

0.90

0.86

TC

10.9

10.3

9.6

13.7

13.0

12.1

85

SHC TPC

5.9

7.0

7.8

7.8

9.1

10.1

Outdoor intake air DB temperature (˚F)

0.85

0.80

0.77

Notes 1. I WB : 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.

1.04

0.99

0.95

TC

10.2

9.5

8.9

12.9

12.0

11.3

95

SHC

5.6

6.5

7.3

7.3

8.4

9.4

TPC

0.91

0.87

0.83

1.12

1.07

1.02

TC

9.5

8.8

8.1

12.0

11.2

10.3

105

SHC TPC

5.2

0.96

6.0

6.6

6.8

7.8

8.6

0.92

0.89

1.18

1.13

1.09

TC

8.7

8.1

7.4

11.0

10.3

9.4

115

SHC TPC

4.8

1.00

5.5

6.0

6.3

7.2

7.8

0.97

0.92

1.23

1.19

1.13

2) COOLING CAPACITY CORRECTIONS

Refrigerant piping length (one way)

Model

25ft (std) 40ft 65ft

MS-A09WA

MS-A12WA

1.0

0.954

0.878

7-2. PERFORMANCE CURVE

NOTE : A point on the curve shows the reference point.

MS-A09WA MS-A12WA

Cooling

SHF at rating condition = 0.68

Airflow = 300CFM

14 16

Indoor intake air WB temperature (

12 14

10 °

F)

12

8

71

67

63

10

6 8

1.1

1.0

0.9

0.8

0.7

0.6

67

Indoor intake air WB temperature (

° F)

75 85 95 105

Outdoor intake air DB temperature (

°

F)

71

67

63

115

1.3

1.2

1.1

1.0

0.9

0.8

67

Cooling

SHF at rating condition = 0.70

Airflow = 363CFM

Indoor intake air WB temperature (

Indoor intake air WB temperature (

° F)

75 85 95 105

Outdoor intake air DB temperature (

°

F)

°

F)

115

71

67

63

71

67

63

12

OB449A.qxp 06.5.9 11:14 AM Page 13

7-3. Condensing pressure

Data is based on the condition of indoor humidity 50%.

Air flow should be set at High.

A point on the curve shows the reference point.

MU-A09WA

(PSIG)

460

440

420

400

380

360

340

320

300

280

260

68 70

In do or D

B te m pe ra tu re

(

° F)

86

80

75

70

75 80 85 90 95

Outdoor ambient temperature

100 105( F)

(PSIG)

200

180

160

140

120

100

68 70

Indoor DB temperature (

° F)

75 80 85 90 95

Outdoor ambient temperature

100 105 ( F)

86

80

75

70

MU-A12WA

(PSIG)

460

440

420

400

380

360

340

320

300

280

260

68 70

In do or D

B te m pe ra tu re

(

° F)

86

80

75

70

75 80 85 90 95

Outdoor ambient temperature

100 105( F)

(PSIG)

200

180

160

140

120

100

68 70

Indoor DB temperature (

°

F)

75 80 85 90 95

Outdoor ambient temperature

100 105 ( F)

86

80

75

70

13

OB449A.qxp 06.5.9 11:14 AM Page 14

7-4. STANDARD OPERATION DATA

Total

Electrical circuit

Refrigerant circuit

Model

Item

Capacity

SHF

Input

INDOOR UNIT MODEL

Power supply (V, phase, Hz)

Input

Fan motor current

OUTDOOR UNIT MODEL

Power supply (V, phase, Hz)

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)

Indoor unit

Outdoor unit

Intake air temperature

Discharge air temperature

Fan speed (High)

Airflow (High)

Intake air temperature

Fan speed

Airflow

Unit

Btu / h

— kW kW

A

DB

WB

DB

WB

DB

WB

˚F

˚F

˚F

˚F

˚F

˚F ft.

— kW

A

A

PSIG

PSIG

˚F

˚F rpm

CFM

˚F

˚F rpm

CFM

48

146

25

2Ib. 5oz.

80

67

57

56

1160

300 (Wet)

95

—

830

1083

MS-A09WA

Cooling

9500

0.68

0.87

MS-A09WA

115, 1, 60

0.019

0.27

MU-A09WA

115, 1, 60

0.851

6.74

0.63

372

144

154

110

50

139

25

3Ib. 1oz.

80

67

59

58

1220

363 (Wet)

95

—

830

1327

MS-A12WA

Cooling

12000

0.70

1.07

MS-A12WA

115, 1, 60

0.035

0.51

MU-A12WA

115, 1, 60

1.035

7.96

0.93

375

150

149

111

14

OB449A.qxp 06.5.9 11:14 AM Page 15

7-5. OPERATING RANGE

(1) POWER SUPPLY

Rating

115V 60Hz 1 [ Outdoor unit

(2) OPERATION

Function

Intake air

temperature

Condition

Standard temperature

Cooling

Maximum temperature

Minimum temperature

Maximum humidity

Guaranteed Voltage

Min. 103V 115V Max. 127V

DB (˚F)

80

95

67

Indoor

WB (˚F)

67

71

57

78%

DB (˚F)

95

115

67

Outdoor

WB (˚F)

—

—

—

—

15

OB449A.qxp 06.5.9 11:14 AM Page 16

8 TROUBLESHOOTING

MU-A09WA MU-A12WA

8-1. Cautions on troubleshooting

1. Before troubleshooting, check the following:

1) Check the power supply voltage.

2) Check the indoor/outdoor connecting wire for mis-wiring.

2. Take care the following during servicing.

1).Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after confirming the horizontal vane is closed, turn OFF the breaker and / or disconnect the power plug.

2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel and the electronic control P.C. board.

3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components.

4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Lead wiring Housing point

8-2. Instruction of trouble shooting

If indoor unit and outdoor unit doesn’t operate, please check of outdoor unit fuse F.

8-3.Trouble criterion of main parts

MU-A09WA

MU-A12WA

Part name

Compressor (MC)

INNER

PROTECTOR

MU-A09WA

302 i

9°F OPEN

194 i

18°F CLOSE

MU-A12WA

338 i

9°F OPEN

194 i

18°F CLOSE

MU-A12WA-

1

311 i

9°F OPEN

194 i 18°F CLOSE

Outdoor fan motor (MF)

Check method and criterion

Measure the resistance between the terminals with a tester.

(Coil wiring temperature 14°F ~ 104°F)

Normal

Color of the lead wire

C-R

C-S

MU-A09WA

0.71~0.87

"

1.31~1.61

"

MU-A12WA

0.58~0.71

"

1.09~1.33

"

INNER

PROTECTOR

MU-A09WA

248 i 9°F OPEN

Measure the resistance between the terminals with a tester.

(Coil wiring temperature 14°F ~ 104°F)

Normal

INNER

PROTECTOR

MU-A12WA

248 i

9°F OPEN

Color of the lead wire

WHT-BLK

BLK-RED

MU-A09WA

51~63

62~76

"

"

MU-A12WA

27~33

34~41

"

"

Figure

S

RED

C

P

WHT

R

BLK

MU-A09WA

MAIN

AUX.

Fuse

BLK

MU-A12WA

RED WHT

MAIN

AUX.

BLK RED ORN WHT

P

:INNER PROTECTOR

16

OB449A.qxp 06.5.9 11:14 AM Page 17

9 DISASSEMBLY INSTRUCTIONS

<"Terminal with locking mechanism" Detaching points>

The terminal which has the locking mechanism can be detached as shown below.

There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.

The terminal without locking mechanism can be detached by pulling it out.

Check the shape of the terminal before detaching.

(1) Slide the sleeve and check if there is a locking lever or not.

(2) The terminal with this connector has the

locking mechanism.

Sleeve

Locking lever

1

Slide the sleeve.

2

Pull the terminal while

pushing the locking

lever.

1

Hold the sleeve, and

pull out the terminal

slowly.

Connector

9-1.

MU-A09WA

OPERATING PROCEDURE

1. Removing the cabinet.

(1) Remove the screw fixing the service panel.

(2) Pull down the service panel and remove it.

(3) Remove the conduit cover.

(4) Disconnect the power supply wire and indoor/outdoor connecting wire.

(5) Remove the screws fixing the top panel.

(6) Remove the top panel.

(7) Remove the screws fixing the cabinet.

(8) Remove the cabinet.

(9) Remove the screws fixing the back panel.

(10) Remove the back panel.

Photo 2

PHOTOS

Photo 1

Screws of the top panel

Screw of the cabinet

Screws of the top panel

Back panel

Screw of the service panel

Hooks

Screw of the conduit cover

Screws of the cabinet

Service panel

Conduit cover Conduit plate

17

OB449A.qxp 06.5.9 11:14 AM Page 18

OPERATING PROCEDURE

2. Removing the electrical parts

(1) Remove the service panel and the cabinet.(Refer to 1.)

(2) Remove the following parts.

•Compressor capacitor (C1)

•Outdoor fan capacitor (C2)

•Terminal block (TB1,TB2)

•Surge absorber (DSAR)

•Compressor contactor (52C)

PHOTOS

Photo 3

Compressor capacitor (C1)

Compressor contactor (52C)

Terminal block

(TB1)

Outdoor fan capacitor (C2)

Surge absorber (DSAR)

Terminal block (TB2)

3. Removing the propeller and the outdoor fan motor

(1) Remove the cabinet. (Refer to 1.)

(2) Remove the propeller nut and the propeller.

NOTE : Loose the propeller in the rotating direction for removal.

When attaching the propeller, align the mark on the propeller and the motor shaft cut section.

Set the propeller in position by using the cut on the shaft and the mark on the propeller.

(3) Remove the lead clamps and outdoor fan motor lead wires.

(4) Remove the screws fixing the outdoor fan motor.

(5) Remove the outdoor fan motor.

Photo 4

Propeller

Screws of the outdoor fan motor

Outdoor fan motor connector

Conduit plate

Sound proof felt

18

OB449A.qxp 06.5.9 11:14 AM Page 19

OPERATING PROCEDURE

4. Removing the compressor

(1) Remove the cabinet. (Refer to 1.)

(2) Remove the relay panel.

(3) Remove the soundproof felt.

(4) Remove the terminal cover on compressor.

(5) Disconnect lead wires from the glass terminal of the compressor.

(6) Recover gas from the refrigerant circuit.

NOTE

● Recover gas from the pipes until the pressure gauge shows

0 PSIG.

(7) Disconnect the welded part of the suction pipe and discharge pipe.

(8) Remove the nuts fixing the compressor.

(9) Remove the compressor.

Photo 5

Glass terminal

PHOTOS

Discharge pipe

Suction pipe

Compressor

Compressor nuts

19

OB449A.qxp 06.5.9 11:14 AM Page 20

9-2.

MU-A12WA

OPERATING PROCEDURE

1. Removing the cabinet

(1) Remove the screws of the cabinet.

(2) Hold the bottom of the cabinet on the both side to remove the cabinet.

(3) Remove the the cabinet.

Photo 1

PHOTOS

Screws of the cabinet

Photo 2

Conduit plate

Service panel

Valve cover

2. Removing the electrical parts

(1) Remove the service panel and the cabinet. (Refer to 1.)

(2) Remove the following parts.

•Compressor capacitor (C1)

•Outdoor fan capacitor (C2)

•Terminal block (TB)

Photo 3

Outdoor fan capacitor (C2)

Terminal block (TB1)

Compressor capacitor (C1)

Terminal block (TB2)

20

OB449A.qxp 06.5.9 11:14 AM Page 21

OPERATING PROCEDURE

3. Removing propeller and the outdoor fan motor

(1) Remove the cabinet. (Refer to 1)

(2) Remove the propeller nut and remove the propeller.

NOTE : Loose the propeller in the rotating direction for removal.

When attaching the propeller, align the mark on the propeller and the motor shaft cut section.

Set the propeller in position by using the cut on the shaft and the mark on the propeller.

(3) Disconnect the connector and remove the lead clamps and outdoor fan motor lead wires.

(4) Remove the screws fixing the outdoor fan motor.

(5) Remove the outdoor fan motor.

Photo 4

Propeller

4. Removing the compressor

(1) Remove the cabinet. (Refer to 1)

(2) Remove the relay panel.

(3) Remove the soundproof felt.

(4) Remove the terminal cover.

(5) Pull out the lead wires from the glass terminal of the compressor.

(6) Recover gas from the refrigerant circuit.

(7) Disconnect the welded part of the suction pipe and discharge pipe.

(8) Remove the nuts fixing the compressor and the compressor.

NOTE

● Before using a burner, reclaim gas from the pipes until the pressure gauge shows 0 PSIG.

● Use the burner under the condition that gas can be recovered even when the inner pressure rises by heat.

Photo 5

Discharge pipe

PHOTOS

Hook Lead clamp

Connector

Propeller nut

Soundproof felt

Relay panel

Glass terminal

Suction pipe

Compressor

Compressor set nuts

21

OB449A.qxp 06.5.9 11:14 AM Page 22

10 PARTS LIST

10-1. PARTS LIST (non-RoHS compliant)

MU-A09WA

1. OUTDOOR UNIT

STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS

17

22

16

15

21

20

19

1

2

3

18

13

14

4

No.

Part No.

6 7

5

Part number that is circled is not shown in the illustration.

Part name

Symbol in Wiring

Diagram

13

14

15

16

17

18

19

20

21

22

23

24

10

11

12

8

9

6

7

3

4

1

2

5

E02 A49 630

E02 A49 301

E02 665 501

E02 903 232

E02 927 521

E02 905 290

E02 075 506

E02 A49 900

E02 A49 661

E02 A49 662

E02 A54 233

E02 A49 245

E02 A50 374

E02 A49 374

E02 A49 350

E02 545 353

E02 A49 340

E02 A49 641

E02 900 293

E02 929 523

E02 900 515

E02 927 297

E02 441 936

E02 282 383

OUTDOOR HEAT EXCHANGER

OUTDOOR FAN MOTOR

PROPELLER

CABINET

GRILLE(OUT)

BASE

COMPRESSOR RUBBER SET

COMPRESSOR

STOP VALVE(GAS)

STOP VALVE(LIQUID)

BACK PANEL

SERVICE PANEL

TERMINAL BLOCK

TERMINAL BLOCK

OUTDOOR FAN CAPACITOR

COMPRESSOR CAPACITOR

COMPRESSOR CONTACTOR

SERVICE PORT

SEPARATOR

CONDENSER NET

MOTOR SUPPORT

TOP PANEL

CAPILLARY TUBE

SURGE ABSORBER

MF

MC

TB1

TB2

C2

C1

52C

DSAR

22

8 9 10

Q'ty/unit

MU-A09WA

1

1

1

1

1

1

1

3

1

1

1

1

1

1

1

1

1

1

1

1

2

1

1

1

11

Remarks

RA6W26-

3RUBBERS/SET

RN092WHDHT

{ 3/8

{ 1/4

3P

2P

7.0

µ

F/250VAC

70

µ

F/220VAC

1PCE/SET

12

O.D. 0.118 x I.D. 0.055x21-21/32

OB449A.qxp 06.5.9 11:14 AM Page 23

MU-A12WA

2. OUTDOOR UNIT

STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS

22

18

17

1

16

2

21

20

19

13

15

14

12

3

11

10

9

4

Part number that is circled is not shown in the illustration.

No.

Part No.

Part name

Symbol in Wiring

Diagram

E02 A50 233

E02 817 232

E02 817 521

E02 141 501

E02 139 515

E02 A50 900

E02 075 506

E02 A27 290

E02 A50 661

E02 A50 662

E02 819 650

E02 A49 641

E02 A50 245

E02 A49 374

E02 A50 374

E02 A50 353

E02 A49 340

E02 A50 350

E02 A50 293

E02 A50 630

E02 A50 301

E02 817 009

E02 134 936

E02 890 383

20

21

22

23

24

16

17

18

19

12

13

14

15

8

9

10

11

5

6

7

3

4

1

2

BACK PANEL

CABINET

GRILLE

PROPELLER

MOTOR SUPPORT

COMPRESSOR

COMPRESSOR RUBBER SET

BASE

STOP VALVE(GAS)

STOP VALVE(LIQUID)

VALVE COVER

SERVICE PORT

SERVICE PANEL

TERMINAL BLOCK

TERMINAL BLOCK

COMPRESSOR CAPACITOR

COMPRESSOR CONTACTOR

OUTDOOR FAN CAPACITOR

SEPARATOR

OUTDOOR HEAT EXCHANGER

OUTDOOR FAN MOTOR

HANDLE

CAPILLARY TUBE

SURGE ABSORBER

MC

TB2

TB1

C1

52C

C2

MF

5 6 7 8

Q'ty/unit

MU-A12WA

1

1

1

1

1

1

1

1

1

1

1

2

1

1

1

1

1

1

1

3

1

1

1

1

Remarks

RN110WHDHT

3RUBBERS/SET

{ 1/2

{ 1/4

1PCE / SET

2P

3P

75 + /220V AC

9.5

+ /250V AC

RA6W50-

O.D. 0.118 ✕ I.D. 0.063 ✕ 27-9/16

23

OB449A.qxp 06.5.9 11:14 AM Page 24

10-2. RoHS PARTS LIST (RoHS compliant)

MU-A09WA

1. OUTDOOR UNIT

STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS

17

16

22

15

21

20

19

1

2

3

18

13

14

4

6 7

5

Part number that is circled is not shown in the illustration.

No.

Part No.

Part name

Symbol in Wiring

Diagram

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

15

16

17

18

19

20

21

22

23

24

8

9

10

11

12

13

14

5

6

7

3

4

1

2

E12 A49 630

E12 A49 301

E12 665 501

E12 903 232

E12 927 521

E12 905 290

E12 075 506

E12 A49 900

E12 A49 661

E12 A49 662

E12 A54 233

E12 A49 245

E12 A50 374

E12 A49 374

E12 A49 350

E12 545 353

E12 A49 340

E12 A49 641

E12 900 293

E12 929 523

E12 900 515

E12 927 297

E12 441 936

E12 282 383

OUTDOOR HEAT EXCHANGER

OUTDOOR FAN MOTOR

PROPELLER

CABINET

GRILLE(OUT)

BASE

COMPRESSOR RUBBER SET

COMPRESSOR

STOP VALVE(GAS)

STOP VALVE(LIQUID)

BACK PANEL

SERVICE PANEL

TERMINAL BLOCK

TERMINAL BLOCK

OUTDOOR FAN CAPACITOR

COMPRESSOR CAPACITOR

COMPRESSOR CONTACTOR

SERVICE PORT

SEPARATOR

CONDENSER NET

MOTOR SUPPORT

TOP PANEL

CAPILLARY TUBE

SURGE ABSORBER

MF

MC

TB1

TB2

C2

C1

52C

DSAR

24

8 9 10

Q'ty/unit

MU-A09WA

1

1

1

1

1

2

1

1

1

1

3

1

1

1

1

1

1

1

1

1

1

1

1

1

11

Remarks

RA6W26-

3RUBBERS/SET

RN092WHDHT

{ 3/8

{ 1/4

3P

2P

7.0

µ

F/250VAC

70

µ

F/220VAC

1PCE/SET

12

O.D. 0.118 x I.D. 0.055x21-21/32

OB449A.qxp 06.5.9 11:14 AM Page 25

MU-A12WA

2. OUTDOOR UNIT

STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS

22

18

17

1

16

2

21

20

19

13

15

14

12

3

11

10

9

4 5 6 7 8

Part number that is circled is not shown in the illustration.

No.

Part No.

Part name

9

10

11

12

13

14

7

8

5

6

3

4

1

2

19

20

21

22

15

16

17

18

23

24

E12 A50 233

E12 817 232

E12 817 521

E12 141 501

E12 139 515

E12 A50 900

E12 075 506

E12 A27 290

E12 A50 661

E12 A50 662

E12 819 650

E12 A49 641

E12 A50 245

E12 A49 374

E12 A50 374

E12 A50 353

E12 A49 340

E12 A50 350

E12 A50 293

E12 A50 630

E12 A50 301

E12 817 009

E12 134 936

E12 890 383

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

G

BACK PANEL

CABINET

GRILLE

PROPELLER

MOTOR SUPPORT

COMPRESSOR

COMPRESSOR RUBBER SET

BASE

STOP VALVE(GAS)

STOP VALVE(LIQUID)

VALVE COVER

SERVICE PORT

SERVICE PANEL

TERMINAL BLOCK

TERMINAL BLOCK

COMPRESSOR CAPACITOR

COMPRESSOR CONTACTOR

OUTDOOR FAN CAPACITOR

SEPARATOR

OUTDOOR HEAT EXCHANGER

OUTDOOR FAN MOTOR

HANDLE

CAPILLARY TUBE

SURGE ABSORBER

Symbol in Wiring

Diagram

Q'ty/unit

MU-A12WA MU-A12WA 1

MC

TB2

TB1

C1

52C

C2

MF

1

1

1

1

1

1

1

2

1

1

1

1

1

1

3

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

2

1

1

1

1

1

1

3

1

1

1

1

1

1

1

1

1

Remarks

RN110WHDHT

3RUBBERS/SET

{ 1/2

{ 1/4

1PCE / SET

2P

3P

75 + /220V AC

9.5

+ /250V AC

RA6W50-

O.D. 0.118 ✕ I.D. 0.063 ✕ 27-9/26

25

OB449A.qxp 06.5.9 11:14 AM Page 26

26

OB449A.qxp 06.5.9 11:14 AM Page 27

27

OB449A.qxp 06.5.9 11:14 AM Page 28

TM

C

Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD.

Distributed in May 2006. No.OB449 REVISED EDITION-A 7

Distributed in Mar. 2006. No.OB449 7

New publication, effective May 2006

Specifications subject to change without notice.

3400 Lawrenceville Suwanee Road

●

Suwanee, Georgia 30024

Toll Free: 800-433-4822

●

Toll Free Fax: 800-889-9904 www.mrslim.com

Specifications are subject to change without notice.