Technibel MCAF78MR5I, MCAF248R5I, MCAF98MR5I, MCAF128MR5I, MCAF188R5I Technical & Service Manual

INDOOR UNIT : MCAF78MR5I

MCAF98MR5I
MCAF128MR5I
MCAF188R5I
MCAF248R5I

DC INVERTER MULTI-SYSTEM AIR CONDITIONER

FILE NO.

REFERENCE NO. SM700739

Destination: Europe

Indoor Model No.Capacity

2.20 kW

2.65 kW

3.50 kW

5.15 kW

7.10 kW

Product Code No.

< Applicable Multi-Outdoor Units >

GRF148MR5I (2-room multi unit)
GRF198MR5I (2-room multi unit)
GRF248MR5I (4-room multi unit)
GRF318MR5I (4-room multi unit)

For details about the combinations, refer
to "Unit Combination Table" in the

T. Service

Manual

for the Multi Outdoor Units.

NOTE

MCAF78MR5I

MCAF98MR5I

MCAF128MR5I

MCAF188R5I

MCAF248R5I

MCAF78MR5IAA

MCAF98MR5IAA

MCAF128MR5IAA

MCAF188R5IAA

MCAF248R5IAA

(1 852 349 58)

(1 852 349 59)

(1 852 349 60)

(1 852 349 61)

(1 852 349 62)

Wall Mounted Type Indoor Unit

RoHS

WARNING

• This product does not contain any hazardous substances prohibited by the RoHS Directive.

• You are requested to use RoHS compliant parts for maintenance or repair.

• You are requested to use lead-free solder.

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AIR CO

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MCAF78MR5I
MCAF98MR5I
MCAF128MR5I

MCAF188R5I
MCAF248R5I

Do not vent R410A into atmosphere : R410A is a fluorinated greenhouse gas,
covered by Kyoto Protocol, with a Global Warming Potential (GWP) = 1975.

F-GAS REGULATION (EC) No 842 / 2006

TECHNICAL &
SERVICE MANUAL

When Wiring

ELECTRICAL SHOCK CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH.
ONLY A QUALIFIED, EXPERIENCED
ELECTRICIAN SHOULD ATTEMPT TO
WIRE THIS SYSTEM.

SPECIAL PRECAUTIONS

This symbol refers to a hazard
or unsafe practice which can
result in severe personal
injury or death.

This symbol refers to a hazard
or unsafe practice which can
result in personal injury or
product or property damage.

CAUTION

CAUTION

WARNING

WARNING

Important!
Please Read Before Starting

This air conditioning system meets strict safety and
operating standards. As the installer or service person, it
is an important part of your job to install or service the
system so it operates safely and efficiently.

For safe installation and trouble-free operation, you
must:

Carefully read this instruction booklet before beginning.
Follow each installation or repair step exactly as shown.
Observe all local, state, and national electrical codes.
Pay close attention to all warning and caution notices
given in this manual.

If Necessary, Get Help

These instructions are all you need for most installation
sites and maintenance conditions. If you require help for
a special problem, contact our sales/service outlet or
your certified dealer for additional instructions.

In Case of Improper Installation

The manufacturer shall in no way be responsible for
improper installation or maintenance service, including
failure to follow the instructions in this document.

Do not supply power to the unit until all wiring and
tubing are completed or reconnected and checked.
Highly dangerous electrical voltages are used in this
system. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and
inadequate grounding can cause accidental injury or
death.
Ground the unit following local electrical codes.
Connect all wiring tightly. Loose wiring may cause
overheating at connection points and a possible fire
hazard.
Install a protective leakage breaker depending on the
installation location (especially a damp or humid
location). If a leakage breaker is not installed, electric
shock can occur.

When Transporting

Be careful when picking up and moving the indoor and
outdoor units. Get a partner to help, and bend your knees
when lifting to reduce strain on your back. Sharp edges or
thin aluminum fins on the air conditioner can cut your
fingers.

When Installing

In a Ceiling or Wall

Make sure the ceiling/wall is strong enough to hold the
unit’s weight. It may be necessary to construct a strong
wood or metal frame to provide added support.

In a Room

Properly insulate any tubing run inside a room to prevent
"sweating" that can cause dripping and water damage to
walls and floors.

In Moist or Uneven Locations

Use a raised concrete pad or concrete blocks to provide a
solid, level foundation for the outdoor unit. This prevents
water damage and abnormal vibration.

In an Area with High Winds

Securely anchor the outdoor unit down with bolts and a
metal frame. Provide a suitable air baffle.

In a Snowy Area (for Heat Pump-type Systems)

Install the outdoor unit on a raised platform that is higher
than drifting snow. Provide snow vents.

When Connecting Refrigerant Tubing

Use the flare method for connecting tubing.
Apply refrigerant lubricant to the matching surfaces of
the flare and union tubes before connecting them, then
tighten the nut with a torque wrench for a leak-free
connection.
Check carefully for leaks before starting the test run.

When Servicing

Tu rn the power off at the main power box (mains) before
opening the unit to check or repair electrical parts and
wiring.
Keep your fingers and clothing away from any moving
parts.
Clean up the site after you finish, remembering to check
that no metal scraps or bits of wiring have been left
inside the unit being serviced.

Others

Ventilate any enclosed areas when installing or testing
the refrigeration system. Escaped refrigerant gas, on
contact with fire or heat, can produce dangerously toxic
gas.
Confirm upon completing installation that no refrigerant
gas is leaking. If escaped gas comes in contact with a
stove, gas water heater, electric room heater or other
heat source, it can produce dangerously toxic gas.

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2

APPLICABLE MULTI-OUTDOOR UNITS

1. OPERATING RANGE

2. SPECIFICATIONS

2-1. Unit Specifications
2-2. Major Component Specifications
2-3. Other Component Specifications

3. DIMENSIONAL DATA

4. REFRIGERANT FLOW DIAGRAM

4-1. Refrigerant Flow Diagram

5. PERFORMANCE DATA

5-1. Air Throw Distance Charts

6. ELECTRICAL DATA

6-1. Electric Wiring Diagrams

7. FUNCTIONS

7-1. Operation Functions
7-2. Protective Functions

8. TROUBLESHOOTING

8-1. Precautions before Performing Inspection or Repair
8-2. Method of Self-Diagnostics
8-3. Checking the Indoor and Outdoor Units
8-4. Trouble Diagnosis of Fan Motor
8-5. Noise Malfunction and Electromagnetic Interference

APPENDIX A INSTRUCTION MANUAL

(MCAF78MR5I, MCAF98MR5I, MCAF128MR5I)

APPENDIX B INSTRUCTION MANUAL

(MCAF188R5I, MCAF248R5I)

APPENDIX C INSTALLATION INSTRUCTIONS

Table of Contents

4

5

6
11
16

17

19

20

25

27
29

30
30
32
33
34

A-1

A-2

A-3

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Page

3

APPLICABLE MULTI-OUTDOOR UNITS

MCAF78MR5I

Indoor Unit

Multi-Outdoor Unit

YES YES YES YES

MCAF98MR5I YES YES YES YES

MCAF128MR5I YES YES YES YES

MCAF188R5I NO YES YES YES

MCAF248R5I NO NO YES YES

2-Room 2-Room 4-Room 4-Room

GRF148MR5I GRF198MR5I GRF248MR5I GRF318MR5I

4

1. OPERATING RANGE

Maximum

Minimum

Maximum

Minimum

32 °C D.B. / 23 °C W.B.

19 °C D.B. / 14 °C W.B.

27 °C D.B.

16 °C D.B.

Temperature Indoor Air Intake Temp.

43 °C D.B.

19 °C D.B.

24 °C D.B. / 18 °C W.B.

–

D.B . / – 15 °C W.B.

Outdoor Air Intake Temp.

Cooling

Heating

5

2. SPECIFICATIONS

2-1. Unit Specifications

Indoor Unit MCAF78MR5I

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Vertical

dB-AIndoor : Hi/Me/Lo/Qt*

Air Filter

Refrigerant

0.11
25

0.11
25

2.2

7,500

2.5

8,500

Shipping Volume

Cooling Heating

410

1.3

Cooling Heating

Depth
Net
Shipping

Package Dimensions

Weight

Width
Depth
Height
Width

mm

kg
kg

m

3

mm
mm
mm
mm

220 to 240V Single-Phase 50Hz

mm

460

-

198 to 264

Dimensions & Weight

(*Qt = Quiet mode)
Refrigerant Tubing Connections

Unit Dimensions Height

Operation Sound

Electrical Rating

Air Circulation (High)
Moisture Removal (High)

WPower Input

V
A

Available Voltage Range
Running Amperes

Refrigerant Tube Kit / Accessories

Narrow tube
Wide tube

Refrigerant mm (in.)

Tube Diameter mm (in.)

350

9.0

11.0

0.08

825
189
255
900

Indoor Unit

285

6.35 (1/4)

9.52 (3/8)

Flare Type

33 / 30 / 27 /2333 / 30 / 27 / 23

R410A

Washable, Anti-Mold

Manual

Auto

Timer

Indoor Fan Speeds

24-Hour ON or OFF Timer, 1-Hour OFF Timer

Auto and 3 steps

Airflow Direction (Indoor) Horizontal

Controls / Temperature Control
Control Unit

Microprocessor / I.C. Thermister

Wireless Remote Control Unit

Features

Optional / Air Clean Filter

kW

Performance

Type

Power Source

Liters/h

BTU/h

Capacity

m

3

/h

Wall Mounted Type Indoor Unit

230VVoltage Rating

6

Indoor Unit MCAF98MR5I

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Vertical

dB-AIndoor : Hi/Me/Lo/Qt*

Air Filter

Refrigerant

0.15
35

0.15
35

2.65

9,000

3.6

12,300

Shipping Volume

Cooling Heating

440

1.6

Cooling Heating

Depth
Net
Shipping

Package Dimensions

Weight

Width
Depth
Height
Width

mm

kg
kg

m

3

mm
mm
mm
mm

220 to 240V Single-Phase 50Hz

mm

480

-

198 to 264

Dimensions & Weight

(*Qt = Quiet mode)
Refrigerant Tubing Connections

Unit Dimensions Height

Operation Sound

Electrical Rating

Air Circulation (High)
Moisture Removal (High)

WPower Input

V
A

Available Voltage Range
Running Amperes

Refrigerant Tube Kit / Accessories

Narrow tube
Wide tube

Refrigerant mm (in.)

Tube Diameter mm (in.)

350

9.0

11.0

0.08

825
189
255
900

Indoor Unit

285

6.35 (1/4)

9.52 (3/8)

Flare Type

34 / 31 / 28 / 2334 / 31 / 28 / 23

R410A

Washable, Anti-Mold

Manual

Auto

Timer

Indoor Fan Speeds

24-Hour ON or OFF Timer, 1-Hour OFF Timer

Auto and 3 steps

Airflow Direction (Indoor) Horizontal

Controls / Temperature Control
Control Unit

Microprocessor / I.C. Thermister

Wireless Remote Control Unit

Features

Optional / Air Clean Filter

kW

Performance

Type

Power Source

Liters/h

BTU/h

Capacity

m

3

/h

Wall Mounted Type Indoor Unit

230VVoltage Rating

7

Indoor Unit MCAF128MR5I

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Vertical

dB-AIndoor : Hi/Me/Lo/Qt*

Air Filter

Refrigerant

0.15
35

0.15
35

3.5

11,900

4.2

14,300

Shipping Volume

Cooling Heating

480

2.0

Cooling Heating

Depth
Net
Shipping

Package Dimensions

Weight

Width
Depth
Height
Width

mm

kg
kg

m

3

mm
mm
mm
mm

220 to 240V Single-Phase 50Hz

mm

500

-

198 to 264

Dimensions & Weight

(*Qt = Quiet mode)
Refrigerant Tubing Connections

Unit Dimensions Height

Operation Sound

Electrical Rating

Air Circulation (High)
Moisture Removal (High)

WPower Input

V
A

Available Voltage Range
Running Amperes

Refrigerant Tube Kit / Accessories

Narrow tube
Wide tube

Refrigerant mm (in.)

Tube Diameter mm (in.)

350

9.0

11.0

0.08

825
189
255
900

Indoor Unit

285

6.35 (1/4)

9.52 (3/8)

Flare Type

34 / 31 / 29 / 2536 / 33 / 29 / 25

R410A

Washable, Anti-Mold

Manual

Auto

Timer

Indoor Fan Speeds

24-Hour ON or OFF Timer, 1-Hour OFF Timer

Auto and 3 steps

Airflow Direction (Indoor) Horizontal

Controls / Temperature Control
Control Unit

Microprocessor / I.C. Thermister

Wireless Remote Control Unit

Features

Optional / Air Clean Filter

kW

Performance

Type

Power Source

Liters/h

BTU/h

Capacity

m

3

/h

Wall Mounted Type Indoor Unit

230VVoltage Rating

8

Indoor Unit MCAF188R5I

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Vertical

dB-AIndoor : Hi/Me/Lo/Qt*

Air Filter

Refrigerant

0.15
35

0.15
35

Shipping Volume

Cooling Heating

850

2.3

Cooling Heating

Depth
Net
Shipping

Package Dimensions

Weight

Width
Depth
Height
Width

mm

kg
kg

m

3

mm
mm
mm
mm

220 to 240V Single-Phase 50Hz

mm

850

-

198 to 264

Dimensions & Weight

(*Qt = Quiet mode)
Refrigerant Tubing Connections

Unit Dimensions Height

Operation Sound

Electrical Rating

Air Circulation (High)
Moisture Removal (High)

WPower Input

V
A

Available Voltage Range
Running Amperes

Refrigerant Tube Kit / Accessories

Narrow tube
Wide tube

Refrigerant mm (in.)

Tube Diameter mm (in.)

379

12.0

15.0

0.12

1,065

218
289

1,140

Indoor Unit

298

6.35 (1/4)

12.7 (1/2)

Flare Type

40 / 37 / 34 / 2841 / 38 / 34 / 28

R410A

Washable, Anti-Mold

Manual

Auto

Timer

Indoor Fan Speeds

24-Hour ON or OFF Timer, 1-Hour OFF Timer

Auto and 3 steps

Airflow Direction (Indoor) Horizontal

Controls / Temperature Control
Control Unit

Microprocessor / I.C. Thermister

Wireless Remote Control Unit

Features

Optional / Air Clean Filter

kW

Performance

Type

Power Source

Liters/h

BTU/h

Capacity

m

3

/h

Wall Mounted Type Indoor Unit

230VVoltage Rating

5.15

17,600

6.0

20,500

9

Indoor Unit MCAF248R5I

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Vertical

dB-AIndoor : Hi/Me/Lo/Qt*

Air Filter

Refrigerant

0.2
45

0.2
45

Shipping Volume

Cooling Heating

920

2.3

Cooling Heating

Depth
Net
Shipping

Package Dimensions

Weight

Width
Depth
Height
Width

mm

kg
kg

m

3

mm
mm
mm
mm

220 to 240V Single-Phase 50Hz

mm

920

-

198 to 264

Dimensions & Weight

(*Qt = Quiet mode)
Refrigerant Tubing Connections

Unit Dimensions Height

Operation Sound

Electrical Rating

Air Circulation (High)
Moisture Removal (High)

WPower Input

V
A

Available Voltage Range
Running Amperes

Refrigerant Tube Kit / Accessories

Narrow tube
Wide tube

Refrigerant mm (in.)

Tube Diameter mm (in.)

379

12.0

15.0

0.12

1,065

218
289

1,140

Indoor Unit

298

6.35 (1/4)

15.88 (5/8)

Flare Type

43 / 40 / 37 / 3044 / 41 / 38 / 30

R410A

Washable, Anti-Mold

Manual

Auto

Timer

Indoor Fan Speeds

24-Hour ON or OFF Timer, 1-Hour OFF Timer

Auto and 3 steps

Airflow Direction (Indoor) Horizontal

Controls / Temperature Control
Control Unit

Microprocessor / I.C. Thermister

Wireless Remote Control Unit

Features

Optional / Air Clean Filter

kW

Performance

Type

Power Source

Liters/h

BTU/h

Capacity

m

3

/h

Wall Mounted Type Indoor Unit

230VVoltage Rating

7.1

24,200

8.5

29,000

10

2-2. Major Component Specifications

2-2-1. Indoor Unit

Indoor Unit MCAF78MR5I

Flap Motor

Type Stepping Motor

Coil Resistance Ohm

(Ambient Temp. 25 °C)

Each Pair of Terminal : 400 +/- 7%

Aluminum Plate Fin / Copper Tube

2

1.3

0.188 Face Area

Coil

Rows

Fin Pitch

Heat Exchanger Coil

m

2

mm

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Rating DC 12V

Model MP24Z3

Over-Heat Protection

Yes

Control PCB

Control Circuit Fuse

Controls

Part No.

Microprocessor

250V 3.15A

CB-KMRV74EH

1 ... D94 / L634

RCS-4MHVPIN4E

Cross-Flow

DC Motor

SIC-39CVL-D847-4 ... 1

8

-

47

1,050 / 1,100

Internal Controller

Yes

-

-

Fan

Remote Control Unit

Q'ty ... Dia. and Length

Type

mm

Fan Motor

Nominal Output
Coil Resistance

Rough Measure RPM (Cool / Heat)

Type
Model ... Q'ty
No. of Poles

Safety Device

Type
Over- Current Protection

(Ambient Temp. 20 °C)

Run Capacitor Micro F

VAC

W

Ohm

11

Indoor Unit MCAF98MR5I

Flap Motor

Type Stepping Motor

Coil Resistance Ohm

(Ambient Temp. 25 °C)

Each Pair of Terminal : 400 +/- 7%

Aluminum Plate Fin / Copper Tube

2

1.3

0.188 Face Area

Coil

Rows
Fin Pitch

Heat Exchanger Coil

m

2

mm

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Rating DC 12V

Model MP24Z3

Over-Heat Protection

Yes

Control PCB

Control Circuit Fuse

Controls

Part No.

Microprocessor

250V 3.15A

CB-KMRV94EH

1 ... D94 / L634

RCS-4MHVPIN4E

Cross-Flow

DC Motor

SIC-39CVL-D847-4 ... 1

8

-

47

1,100 / 1,150

Internal Controller

Yes

-

-

Fan

Remote Control Unit

Q'ty ... Dia. and Length

Type

mm

Fan Motor

Nominal Output
Coil Resistance

Rough Measure RPM (Cool / Heat)

Type
Model ... Q'ty
No. of Poles

Safety Device

Type
Over- Current Protection

(Ambient Temp. 20 °C)

Run Capacitor Micro F

VAC

W

Ohm

12

Indoor Unit MCAF128MR5I

Flap Motor

Type Stepping Motor

Coil Resistance Ohm

(Ambient Temp. 25 °C)

Each Pair of Terminal : 400 +/- 7%

Aluminum Plate Fin / Copper Tube

2

1.3

0.188 Face Area

Coil

Rows
Fin Pitch

Heat Exchanger Coil

m

2

mm

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Rating DC 12V

Model MP24Z3

Over-Heat Protection

Yes

Control PCB

Control Circuit Fuse

Controls

Part No.

Microprocessor

250V 3.15A

CB-KMRV124EH

1 ... D94 / L634

RCS-4MHVPIN4E

Cross-Flow

DC Motor

SIC-39CVL-D847-4 ... 1

8

-

47

1,200 / 1,200

Internal Controller

Yes

-

-

Fan

Remote Control Unit

Q'ty ... Dia. and Length

Type

mm

Fan Motor

Nominal Output
Coil Resistance

Rough Measure RPM (Cool / Heat)

Type
Model ... Q'ty
No. of Poles

Safety Device

Type
Over- Current Protection

(Ambient Temp. 20 °C)

Run Capacitor Micro F

VAC

W

Ohm

13

Indoor Unit MCAF188R5I

Flap Motor

Type Stepping Motor

Coil Resistance Ohm

(Ambient Temp. 25 °C)

Each Pair of Terminal : 400 +/- 7%

Aluminum Plate Fin / Copper Tube

2

1.3

0.285 Face Area

Coil

Rows
Fin Pitch

Heat Exchanger Coil

m

2

mm

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Rating DC 12V

Model MP24Z3

Over-Heat Protection

Yes

Control PCB

Control Circuit Fuse

Controls

Part No.

Microprocessor

250V 3.15A

CB-KRV184EH

1 ... D94 / L845

RCS-4MHVPINW4E

Cross-Flow

DC Motor

SIC-39CVL-D847-2 ... 1

8

-

30

1,200 / 1,200

Internal Controller

Yes

-

-

Fan

Remote Control Unit

Q'ty ... Dia. and Length

Type

mm

Fan Motor

Nominal Output
Coil Resistance

Rough Measure RPM (Cool / Heat)

Type
Model ... Q'ty
No. of Poles

Safety Device

Type
Over- Current Protection

(Ambient Temp. 20 °C)

Run Capacitor Micro F

VAC

W

Ohm

14

Indoor Unit MCAF248R5I

Flap Motor

Type Stepping Motor

Coil Resistance Ohm

(Ambient Temp. 25 °C)

Each Pair of Terminal : 400 +/- 7%

Aluminum Plate Fin / Copper Tube

2

1.3

0.285 Face Area

Coil

Rows

Fin Pitch

Heat Exchanger Coil

m

2

mm

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Rating DC 12V

Model MP24Z3

Over-Heat Protection

Yes

Control PCB

Control Circuit Fuse

Controls

Part No.

Microprocessor

250V 3.15A

CB-KRV244EH

1 ... D94 / L845

RCS-4MHVPINW4E

Cross-Flow

DC Motor

SIC-39CVL-D847-2 ... 1

8

-

30

1,300 / 1,300

Internal Controller

Yes

-

-

Fan

Remote Control Unit

Q'ty ... Dia. and Length

Type

mm

Fan Motor

Nominal Output

Coil Resistance

Rough Measure RPM (Cool / Heat)

Type

Model ... Q'ty

No. of Poles

Safety Device

Type
Over- Current Protection

(Ambient Temp. 20 °C)

Run Capacitor Micro F

VAC

W

Ohm

15

2-3. Other Component Specifications

10

1

2

3

4

5

6

7

8

9

10

15 20 25 30 35 40

Resistance (k ohm)

Temperature (°C)

0

0102030405060708090

40

60

80

100

120

140

160

180

200

20

Resistance (k ohm)

Temperature (°C)

Indoor air temp sensor

PTM-D51H­S3 TH2

Model No.

of sensor

Sensor Name

111

Quantity of Sensor

00

PTM-D51H­S3-2 TH2

00011

MCAF78MR5I MCAF98MR5I MCAF128MR5I

MCAF188R5I MCAF248R5I

Indoor heat exchanger sensor

PTM-D51H­S3 TH1

Model No.

of sensor

Sensor Name

111

Quantity of Sensor

00

PTM-D51H­S3-2 TH1

00011

MCAF78MR5I MCAF98MR5I MCAF128MR5I

MCAF188R5I MCAF248R5I

16

3. DIMENSIONAL DATA

Indoor Unit MCAF78MR5I

MCAF98MR5I
MCAF128MR5I

Unit: mm

17

Indoor Unit MCAF188R5I

MCAF248R5I

Unit: mm

18

Indoor heat
exchanger

O.D. 9.52 mm (3/8")

O.D. 6.35 mm (1/4")

Cooling cycle

Heating cycle

Indoor unit

Indoor heat
exchanger

O.D. 12.7 mm (1/2")

O.D. 6.35 mm (1/4")

Cooling cycle

Heating cycle

Indoor unit

Indoor heat
exchanger

O.D. 15.88 mm (5/8")

O.D. 6.35 mm (1/4")

Cooling cycle

Heating cycle

Indoor unit

4. REFRIGERANT FLOW DIAGRAM

4-1. Refrigerant Flow Diagram

Indoor Unit MCAF78MR5I

MCAF98MR5I
MCAF128MR5I

Indoor Unit MCAF188R5I

Indoor Unit MCAF248R5I

19

Horizontal distance (m)

Axis air velocity (m/s)

Vertical distance (m)

Room air temp. : 20°C
Fan speed : High

Heating

Horizontal distance (m)

Axis air velocity (m/s)

Vertical distance (m)

Room air temp. : 27°C
Fan speed : High

Cooling

: Flap angle 0°, : Axis air velocity 0

°

: Flap angle 30°, : Axis air velocity 30

°

: Flap angle 45°, : Axis air velocity 45

°

: Flap angle 60°, : Axis air velocity 60

°

5. PERFORMANCE DATA

5-1. Air Throw Distance Charts

Indoor Unit MCAF78MR5I

20

0

1

2

3

4

012345678910

0

1

2

3

4

5

0123456789

Horizontal distance (m)

Axis air velocity (m/s)

Vertical distance (m)

Room air temp. : 20°C
Fan speed : High

Heating

Horizontal distance (m)

Axis air velocity (m/s)

Vertical distance (m)

Room air temp. : 27°C
Fan speed : High

Cooling

: Flap angle 0°, : Axis air velocity 0

°

: Flap angle 30°, : Axis air velocity 30

°

: Flap angle 45°, : Axis air velocity 45

°

: Flap angle 60°, : Axis air velocity 60

°

Indoor Unit MCAF98MR5I

21

0

1

2

3

4

012345678910

0

1

2

3

4

5

0123456789

Horizontal distance (m)

Axis air velocity (m/s)

Vertical distance (m)

Room air temp. : 20°C
Fan speed : High

Heating

Horizontal distance (m)

Axis air velocity (m/s)

Vertical distance (m)

Room air temp. : 27°C
Fan speed : High

Cooling

: Flap angle 0°, : Axis air velocity 0

°

: Flap angle 30°, : Axis air velocity 30

°

: Flap angle 45°, : Axis air velocity 45

°

: Flap angle 60°, : Axis air velocity 60

°

Indoor Unit MCAF128MR5I

22

0

1

2

3

4

012345678910

0

1

2

3

4

5

0123456789

Horizontal distance (m)

Axis air velocity (m/s)

Vertical distance (m)

Room air temp. : 20°C
Fan speed : High

Heating

Horizontal distance (m)

Axis air velocity (m/s)

Vertical distance (m)

Room air temp. : 27°C
Fan speed : High

Cooling

: Flap angle 0°, : Axis air velocity 0

°

: Flap angle 30°, : Axis air velocity 30

°

: Flap angle 45°, : Axis air velocity 45

°

: Flap angle 60°, : Axis air velocity 60

°

Indoor Unit MCAF188R5I

23

0

1

2

3

4

012345678910

0

1

2

3

4

5

0123456789

Horizontal distance (m)

Axis air velocity (m/s)

Vertical distance (m)

Room air temp. : 20°C
Fan speed : High

Heating

Horizontal distance (m)

Axis air velocity (m/s)

Vertical distance (m)

Room air temp. : 27°C
Fan speed : High

Cooling

: Flap angle 0°, : Axis air velocity 0

°

: Flap angle 30°, : Axis air velocity 30

°

: Flap angle 45°, : Axis air velocity 45

°

: Flap angle 60°, : Axis air velocity 60

°

Indoor Unit MCAF248R5I

24

0

1

2

3

4

012345678910

0

1

2

3

4

5

0123456789

8FA-2-5257-72600-1

1
2
3
4
5
6

1
2
3
4

1
2
3
4

1
2
3
4

5

1
2
3
4
5

1
2
3
4
5

1
2
3
4
5

1
2
3
4
5

6

1
2
3
4
5
6
7
8
9

10

1
2
3
4
5
6
7
8
9

10

1
2
3
4
5
6
7
8
9

10

1
2
3
4
5
6
7
8
9

10

FAN MOTOR

FLAP MOTOR

CONNECTOR

TERMINAL BASE

ROOM THERMISTOR

CONTROLLER

COIL THERMISTOR

CONNECTOR

ION ASSY

TO OUTDOOR UNIT

IND LAMP ASSY

EVAPORATOR

FM

FLAP

GRN/YEL

BLU

YEL

WHT

BLK

RED

RED
PNK
BLU
BRN

YEL

RED

WHT

BLK

1

2

3

4

RED
WHT
WHT
WHT
WHT
WHT
WHT
WHT
WHT
WHT

1
2
3

1

1 2 3 4

1 2 3 4
1 2 3 4

2
3

1
2
3

1
2
3

WHT
RED

BLK

BLK
BLK
BLK
BLK

AC1

FLAP
5P (WHT)

DCM
6P (BLU)

LAMP

10P (WHT)

ROOM/COIL

4P (WHT)

ION

3P (WHT)

HA

JEM-A

ION
TERMINAL

4P (WHT)

SIAC2

BLK

BLK

BLK

RED

WHT

6. ELECTRICAL DATA

6-1. Electric Wiring Diagrams

Indoor Unit MCAF78MR5I

MCAF98MR5I
MCAF128MR5I

WARNING

To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.

25

8FA-2-5257-68200-0

1
2
3
4
5
6

1
2
3
4

1
2
3
4

1
2
3
4

5

1
2
3
4
5

1
2
3
4
5

1
2
3
4
5

1
2
3
4
5

6

1
2
3
4
5
6
7
8
9

10

1
2
3
4
5
6
7
8
9

10

1
2
3
4
5
6
7
8
9

10

1
2
3
4
5
6
7
8
9

10

FAN MOTOR

FLAP MOTOR

CONNECTOR

TERMINAL BASE

ROOM THERMISTOR

CONTROLLER

COIL THERMISTOR

ION ASSY

TO OUTDOOR UNIT

IND LAMP ASSY

EVAPORATOR

FM

FLAP

GRN/YEL

GRN/YEL

BLU

YEL

WHT

BLK

RED

RED
PNK
BLU
BRN

YEL

RED

WHT

BLK

1

2

3

4

RED
WHT
WHT
WHT
WHT
WHT
WHT
WHT
WHT
WHT

1
2
3

1

1 2 3 4

1 2 3 4
1 2 3 4

2
3

BLK
BLK
BLK
BLK

AC1

FLAP
5P (WHT)

DCM
6P (BLU)

E

LAMP

10P (WHT)

ROOM/COIL

4P (WHT)

ION

3P (WHT)

HA

JEM-A

ION
TERMINAL

4P (WHT)

SIAC2

BLK

BLK

BLK

RED

WHT

Indoor Unit MCAF188R5I

MCAF248R5I

WARNING

To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.

26

Emergency operation SENSOR DRY

AUTO cooling/heating operation

Selecting the operation mode

During DRY operation, the system adjusts the room
temperature and fan speed according to the conditions in the
room, in order to maintain a comfortable room environment.

SENSOR DRY operation

• DRY operation is as shown in the figure below.

PAM- control

• In order to further improve inverter performance, control is

switched between PWM control at low operation speeds, and
PA M control at high operation speeds, making the most
effective use of power.

The compressor operation frequency varies.
The indoor fan operates with 1/f fluctuation.

The compressor operates at a low operating frequency.
The indoor fan operates with 1/f fluctuation.

• Monitoring operation takes place when the room temperature
is below 15 °C, or more than 3 °C below the set temperature.

• When the monitoring range is entered, the compressor stops,
and the indoor fan operates with 1/f fluctuation.

DRY A

DRY B

Monitor

Conditions are monitored at all
times when the room temperature
is below 15 °C.

Load

COOL zone

A zone

B zone

Emergency operation is available when the remote
controller malfunctions, has been lost, or otherwise
cannot be used.

• The set temperature is 2 °C below the detected room

temperature in the case of cooling operation, and 2 °C
above the room temperature in the case of heating
operation. The flap and fan speed settings are AUTO.

(GREEN) (RED) (Lamp Off)

COOL HEAT STOP

• When AUTO mode is selected, the microprocessor calculates

the difference between the set temperature and the room
temperature, and automatically switches to Cooling or
Heating mode.

• As shown by the example in the figure below, with AUTO
cooling/heating operation, the mode changes between
Heating and Cooling mode according to changes in the
relationship between the current room temperature and the
set temperature.

Room temp. Set temp. COOL
Room temp. Set temp. HEAT

23

Zone A

Zone B

Zone C

Zone C

Zone B

Zone A

OFF OFF

Compressor

Operation mode

Room temp.

HeatingCooling Cooling

ON ON ON

More than

1 hour

Within

1 hour

Set temp.

Example
Example of operation in AUTO mode with the set room temperature
at 23 °C.

When multiple indoor units are used and units in other rooms are
already operating, they will be set to the same mode of operation
as the operating indoor units.

To operate the system, press the OPERATION button,

which is also used as the receiver, below the unit display.

Each time this button is pressed, the OPERATION lamp
changes color to indicate the type of operation. Select the
desired type of operation.

7. FUNCTIONS

7-1. Operation Functions

NOTE

27

• When NIGHT SETBACK operation is set, the temperature and
fan speed settings will be adjusted automatically to allow
comfortable sleep.

• When NIGHT SETBACK operation is set, " mark" appears on
the remote controller. The main unit display lamp also becomes
dimmer.

COOL and DRY modes

When the night setback mode is selected, the air conditioner
automatically raises the temperature setting 1°C when 30
minutes have passed after the selection was made, and then
another 1°C after another 30 minutes have passed, regardless
of the indoor temperature when night setback was selected.
This enables you to save energy without sacrificing comfort.
This function is convenient when gentle cooling is needed.

HEAT mode

When the night setback mode is selected, the air conditioner
automatically lowers the temperature setting 2°C when 30
minutes have passed after the selection was made, and then
another 2°C after another 30 minutes have passed, regardless
of the indoor temperature when night setback was selected.
This enables you to save energy without sacrificing comfort.
This function is convenient when gentle heating is needed.

HIGH POWER

NIGHT SETBACK

Lamp colors

Timer backup

This function acts to raise the power but keeps the AC system in
the same operating mode.
This function is set with the HIGH POWER button on the remote
controller.
(It can be set regardless of the temperature and fan speed
settings.)

HIGH POWER operation from remote controller

The unit operates at maximum output for 30 minutes,
regardless of the desired temperature.
The fan speed is 1 step above "High."

OPERATION lamp

• When HIGH POWER operation ends, the unit operates at low

Hz for 5 minutes, regardless of the thermostat OFF conditions.

• When in DRY mode, operation is in the cooling zone.

• Operation stops if there are no operator controls for 25 hours or

longer after unit operation switched from OFF to ON by use of
ON timer operation.

Frequency

MAX

0

Start End

Time

30 min. 5 min.

Setting
temperature

Press the NIGHT
SETBACK button

TIMER lamp Green

QUIET lamp Green

ION lamp Green

HEAT operation Red
DRY operation Orange
COOL operation Green
DEFROSTING operation Red and Orange

alternately

NOTE

30 min. 30 min.

Time

1°C(2°F)

Setting
temperature

Press the NIGHT
SETBACK button

30 min. 30 min.

Time

1°C(2°F)

2°C(4°F)

2°C(4°F)

28

Overload prevention during heating

During HEAT operation, the temperature of the indoor heat
exchanger is used to control the frequency and lessen the load
on the compressor before the protective device is activated.

Cold-air prevention during heating

During heating, the fan speed is set to "LL" (very low) or stopped.
As the temperature of the indoor heat exchanger rises, the fan
speed is changed to the set speed.

Freeze prevention

During COOL or DRY operation, freezing is detected and
operation is stopped when the temperature of the indoor heat
exchanger matches the conditions below.

1.

Freeze-prevention operation is engaged when the
temperature of the indoor heat exchanger is below 6 °C.

2.

Restart after freeze-prevention operation occurs when the
temperature of the indoor heat exchanger reaches 8 °C or
above.

a.

Area: Automatic capacity control

b.

When Point A has been exceeded, the operation frequency is
reduced by a certain proportion.

c.

Area: Frequency increase is prohibited.

d.

At Point B and below, overload prevention is ended and
control is the same as in the

a

area.

a.

Area: Automatic capacity control

b.

When the temperature drops below Point A, the operation
frequency is reduced by a certain proportion.

c.

Area: Frequency increase is prohibited.

d.

When the temperature reaches Point C or above, freezing
prevention is ended and control is the same as in the

a

area.

* When the temperature drops to below 2 °C (continuously for 2

minutes or longer), the compressor stops.
Once the freeze condition is detected, the air conditioner will
work less than the maximum frequency until it is turned off.

Approx.

53

At stability of operation

At start of operation

A

High

LL

Stopped

A

*

B

C

B

Indoor heat exchanger
A. Control start
B. Control end

Set fan speed

25 30 Approx. 40

abc d

abcd

Indoor heat exchanger

temperature (°C)

Indoor heat exchanger

temperature (°C)

Indoor heat exchanger

temperature (°C)

Approx.

47

2

6

8

• The fan speed is forcibly changed to "LL" beginning 30 seconds

after the thermostat turns OFF.

• At stability of operation refers to operation when the room

temperature has approached the set temperature.

• When HEAT operation starts, the indoor fan is stopped until the

temperature of the indoor heat exchanger reaches 20 °C or
higher, or until the room temperature reaches 15 °C or higher.

NOTE

7-2. Protective Functions

29

1HR.
TIMER
button

ON/OFF
operation
button

ACL
(Reset)
button

ION
button

8. TROUBLESHOOTING

8-1. Precautions before Performing Inspection or Repair

NOTE

After checking the self-diagnostics monitor, turn the power OFF before starting inspection or repair.

High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an electrical charge
(charging voltage DC 310V) even after the power is turned OFF, and some time is required for the charge to dissipate. Be
careful not to touch any electrified parts before the controller LED (red) turns OFF.

If the outdoor controller is normal, approximately 30 seconds will be required for the charge to dissipate. However, allow at
least 5 minutes for the charge to dissipate if there is thought to be any trouble with the outdoor controller.

1: If the operation lamp blinks every 0.5 seconds immediately when the

power is turned ON, there is an external ROM (OTP data) failure on the
indoor circuit board, or a ROM socket insertion problem, or the ROM
has not been installed.

2: The failure mode is stored in memory even when the power is not ON.

Follow the procedure below to perform diagnostics.

8-2. Method of Self-Diagnostics

Follow the procedure below to perform detailed trouble diagnostics.

< Clock display >

Test run mode

Self-diagnostics mode

PROCEDURE

Step 1: Press and hold the remote controller ION button and 1 HR TIMER

button. Then, press and hold the ACL (reset) button with a pointed
object such as the tip of a pen. After 5 seconds, release ACL
button first, then release ION and 1 HR TIMER buttons, "oP-1"
(test run) appears, blinking in the remote controller clock display
area.

Step 2: Next, press the 1 HR TIMER button once to change the display

from "oP-1" to "oP-3" (self-diagnostics). (The display continues to
blink.)

Step 3: Finally press the ON/OFF button to engage self-diagnostics mode.

• The self-diagnostics function utilizes the 3 indicator lamps on the main
unit, in combinations of ON lamps, blinking lamps, and OFF lamps, to
report the existence of sensor trouble or a protective operation. (The
lamps blink or remain ON for 5 seconds, then turn OFF for 2 seconds.)
Self-diagnostics is completed when the buzzer sounds 3 short beeps.

• A maximum of 3 self-diagnostics reports are displayed, for 5 seconds
each, beginning with the most recent report. Following this display the
lamps turn OFF. In order to view the self-diagnostics results again,
press the ON/OFF button again.

• The 3 lamps remain OFF if no trouble has occurred.

<IMPORTANT> After self-diagnostics is completed, be sure to press the

ACL (reset) button to return to normal mode. The air
conditioner will not operate if this is not done.

After turning on power to the air conditioner, use the remote controller and
follow the steps below to execute self-diagnostics.

30

•

Since the indications cover various units, the corresponding parts listed below may not be present in some models.

REMOTE CONTROL receiver

(1) OPERATION lamp
(2) TIMER lamp
(3) QUIET lamp
ION lamp

OPERATION button

INDOOR UNIT

(1) Self-diagnostics Lamps

Indication on indoor unit

....

OFF

Timer Operation

Code Diagnostics items Diagnostics contents

S01

Room temperature sensor failure

Indoor heat exchanger sensor failure

Humidity sensor failure

Compressor temperature sensor failure

Outdoor heat exchanger sensor failure

Outdoor air temperature sensor failure

Indoor/outdoor communications failure
(serial communications)

Outdoor unit external ROM (OTP data)
failure

Peak current cut-off

• HIC circuit failure

• Power Tr (transistor) circuit failure

PAM circuit failure
Active circuit failure

Outdoor system communications failure
OLR operation
Outdoor power supply open phase
Outdoor coil freezing

Compressor discharge overheat
prevention activated.

Indoor fan operating failure

No-refrigerant protection

DC compressor drive circuit failure

Outdoor fan operating failure

Freeze-prevention operation activated.

4-way valve switching failure
Indoor zero-cross failure

Outdoor electrical current detection
failure

S02

S03

S04

S05

S06

S07

E01

E02

E03

E04

E05

E06

E07

E08

E09

E10

E11

E12

E13

....

Blinking

....

ON (Illuminated)

Quiet

(3) (2) (1)

(1) Sensor open circuit or short circuit
(2) Contact failure at connector or open circuit at terminal crimping location

(short-circuit detection only for the humidity sensor)

(3) Indoor/outdoor PCboard failure

(1) Sensor open circuit or short circuit
(2) Contact failure at connector or open circuit at terminal crimping location
(3) Outdoor PCboard failure

Outdoor PCboard failure

(1) Mis-wiring (2) AC power failure (3) Blown fuse (4) Power Relay failure
(5) Indoor or outdoor PCboard failure (6) Outdoor Fan Motor failure (7) Reactor failure
(8) High-Pressure Switch failure (9) Overload Relay failure (10) Magnetic Coil failure
* See detailed flowchart in this section.

(1) HIC or power Tr failure (2) Outdoor fan does not turn. (3) Instantaneous power outage
(4) Service valve not opened. (5) Outdoor fan blocked. (6) Continuous overload operation
(7) Compressor failure (8) Outdoor PCboard failure

(1) External ROM data failure (2) Outdoor PCboard failure

(1) Instantaneous power outage (2) HIC or power transistor failure
(3) Outdoor PCboard failure

(1) Outdoor PCboard failure (2) Outdoor power supply voltage failure

(1) Electric expansion valve failure (2) Capillaries choked (3) Shortage of refrigerant
(4) Continuous overload operation (5) Outdoor fan does not rotate (6) Outdoor

PCboard

failure

(1) Fan motor failure (2) Contact failure at connector (3) Indoor PCboard failure

(1) 4-way valve failure (heat pump model only)
(2) Outdoor PCboard failure

(1) Service valve not opened. (2) Shortage of refrigerant

(1) Open phase (2) Outdoor PCboard failure

(1) Fan motor failure (2) Contact failure at connector (3) Outdoor PCboard failure

(1) Mis-wiring (2) Blown fuse (3) Power Relay failure (4) Outdoor PCboard failure
(5) Compressor failure
* See detailed flowchart in this section.

(1) Indoor fan system failure (2) Shortage of refrigerant (3) Low-temperature operation

31

(2) If the self-diagnostics function fails to operate

8-3. Checking the Indoor and Outdoor Units

(1) Checking the indoor unit

(2) Checking the outdoor unit

(3) Checking the serial communications

Using the TEST/T-RUN terminals

Check the indoor unit.

Is the fuse blown?

ControlNo. Check items (unit operation)

Replace the controller.

Replace the circuit

board or the fuse.

No indicators illuminate and the
indoor fan does not rotate.

Check the power voltage.

•

•

T-RUN : Test run (compressor and fan motor turn ON).
TEST/MV : Compresses time to 1/60th (accelerates

operation by 60 times faster than normal).

Use the remote controller to operate the
unit in "TEST run" mode. To determine
whether the mode is currently in
"TEST run" mode, check the 4 indicator
lamps on the unit. If all 4 are blinking,
the current mode is "TEST run."

If there are no problems with the above, then check the outdoor unit.

1

The rated voltage must be present between inter-unit wirings 1 and 2.
Connect a 5 k ohm resistor between inter-unit wirings 2 and 3. When the
voltage at both ends is measured, approximately 12 to 15V DC must
be output and the multimeter pointer must bounce once every 8
seconds.
Or instead of measuring the voltage, you can insert an LED jig and
check that the LED flickers once every 8 seconds.

•

•

ControlNo. Check items (unit operation)

Apply the rated voltage between outdoor
unit terminals L and N.

If there are no problems with the above, then check the indoor unit.

Tu rn the power OFF before performing short circuiting procedures.

Refer to the previous pages when performing system self-diagnostics.

So that the check can be made quickly, indicators blink at first communication after power ON.

Before performing the above checks, perform “TEST run” operation, and check that the rated voltage is output to terminals 1 and 2
on the outdoor unit. If it is not output, there is a failure related to the indoor unit power.

1 The control panel LED (red) must illuminate.

Short-circuit the outdoor unit COM terminal
to the T-RUN terminal.

2 The compressor, fan motor, and 4-way valve must all turn on.

•

•

Normal

Blown

TEST/T-RUN terminals

(TEST)/MV T-RUN COM

For the "Test run" procedure, refer to 5. "HOW TO TEST RUN THE AIR CONDITIONER" on Appendix C.

Probable location of malfunction

Indoor unit circuit board failure

Outdoor unit circuit board failure

Failure (open circuit, contact failure, etc.)
in the inter-unit wirings

Outdoor unit circuit board failure

Short-circuit terminals 2 and 3 on
the outdoor unit terminal plate.

Short-circuit terminals 2 and 3 on
the indoor unit terminal plate.

Initial self-diagnostics

Control 1 Control 2

....

OFF

....

Blinking

....

Illuminated

Quiet

( 3 )

Timer

( 2 )

Operation

( 1 )

Quiet

( 3 )

Timer

( 2 )

Operation

( 1 )

Quiet

( 3 )

Timer

( 2 )

Operation

( 1 )

32

8-4. Trouble Diagnosis of Fan Motor

8-4-1. Indoor Fan Motor

This indoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil
resistance, and the following procedure should be used to check the motor.
To perform diagnosis, operate the unit in cooling mode with indoor fan speed "High". Next, make sure that the
indoor unit receive the signals from the remote controller when the ON/OFF operation button is pressed.

[Trouble symptom 1] The fan does not stop when the unit stops. Indoor unit controller trouble.

[Trouble symptom 2] The fan motor does not rotate when the unit is operating.

(Diagnostic procedure)

* Disconnect the motor connectors and measure the voltage at the DC motor connectors on the indoor

unit controller (3 locations).

(Diagnostic results)

All of the above measured values are normal. Fan motor trouble (Replace the motor.)
Any one of the above measured values is not normal. Indoor unit controller trouble

(Replace the controller .)

(Reference) DC motor connector pin arrangement

Pin 1: Vm (red)
Pin 2: Not used
Pin 3: Gnd (black)
Pin 4: Vcc (white)
Pin 5: Vs (yellow)
Pin 6: PG (blue)

[Trouble symptom 3] Motor rotates for some time (several seconds), but then quickly stops, when the indoor unit

operates.
(There is trouble in the system that provides feedback of motor rotation speed from the
motor to the indoor unit controller.)

[Trouble symptom 4] Fan motor rotation speed does not change during indoor unit operation.

[Trouble symptom 5] Fan motor rotation speed varies excessively during indoor unit operation.

(Remedy for symptom 3 to 5)

It is not possible to identify whether the trouble is indoor unit controller trouble or motor trouble.
Therefore, first replace the indoor unit controller, then (if necessary) replace the DC motor.

Important:

(A) Turn OFF the power before connecting or disconnecting the motor connectors.
(B) When performing voltage measurement at the indoor controller connector for (3) in the table

below, the DC motor will trip and voltage output will stop approximately 1 minute after operation
is started. For this reason, to measure the voltage again, turn OFF the unit once using the
remote controller, and then start the air conditioner again.

(1) Vm-Gnd: Between pin 1 and pin 3
(2) Vcc-Gnd: Between pin 4 and pin 3
(3) Vs-Gnd: Between pin 5 and pin 3

Measurement location

DC 230V or more
DC 14V or more
Fluctuation between DC 1.7 to 6.1V

Normal value

33

8-5. Noise Malfunction and Electromagnetic Interference

An inverter A/C operates using pulse signal control and high frequencies. Therefore, it is susceptible to the effects of external
noise, and is likely to cause electromagnetic interference with nearby wireless devices.

A noise filter is installed for ordinary use, preventing these problems. However, depending on the installation conditions, these
effects may still occur. Please pay attention to the points listed below.

(1) Noise malfunction

This refers to the application of high-frequency noise to the signal wires, resulting in abnormal signal pulses and malfunction.

Locations most susceptible to noise

1. Locations near broadcast stations where
there are strong electromagnetic waves

2. Locations near amateur radio (short wave)
stations

3. Locations near electronic sewing machines
and arc-welding machines

Correction

(The fundamental concept is to make the

system less susceptible to noise.)

- Insulate for noise or

distance from the noise source. -

1. Use shielded wires.

2. Move unit away from the noise source.

Trouble

Either of the following trouble may occur.

1. The unit may stop suddenly during
operation.

2. Indicator lamps may flicker.

(2) Electromagnetic interference

This refers to noise generated by high-speed switching of the microcomputer and compressor. This noise radiates through
space and returns to the electric wiring, affecting any wireless devices (televisions, radios, etc.) located nearby.

Locations most susceptible to noise

1. A television or radio is located near the
A/C and A/C wiring.

2. The antenna cable for a television or
radio is located close to the A/C and A/C
wiring.

3. Locations where television and radio
signals are weak.

Correction

1. Select a separate power source.

2. Keep the A/C and A/C wiring at least 1 meter
away from wireless devices and antenna cables.

3. Change the wireless device’s antenna to a high­sensitivity antenna.

4. Change the antenna cable to a BS coaxial cable.

5. Use a noise filter (for the wireless device).

6. Use a signal booster.

Trouble

1. Noise appears in the television picture,
or the picture is distorted.

2. Static occurs in the radio sound.

34

INSTRUCTION MANUAL

MCAF78MR5I
MCAF98MR5I

MCAF128MR5I

(OI-852-6-4181-047-00-0)

APPENDIX A

A-1

OPERATING INSTRUCTIONS • INSTRUCCIONES DE USO

NOTICE D’UTILISATION • BEDIENUNGSANLEITUNG

ISTRUZIONI D’USO

This air conditioner uses the new refrigerant R410A

MCAF78MR5I
MCAF98MR5I

MCAF128MR5I

Save These Instructions• Guardéis estas instrucciones

Conserver ce notice d’utilisation• Bewahren Sie bitte diese Bedienungsanleitung auf

Split air conditioner system • Acondicionador de aire de consola partida sistema split

Climatiseurs split • Split-klimagerät • Condizionatore d’aria split system

Pub. OI-85264181047000

Conservate queste istruzioni

12/2007

Features

This air conditioner is an inverter type unit that automatically adjusts capability as appropriate. Details on these
functions are provided below; refer to these descriptions when using the air conditioner.

• Microprocessor Controlled Operation

The interior compartment of the remote control
unit contains several features to facilitate
automatic operation, easy logically displayed for
easy use.

• Simple One-touch Wireless Remote Control

The remote control unit has several features to
facilitate automatic operation.

• 24-Hour ON or OFF Timer

This timer can be set to automatically turn the
unit on or off at any time within a 24 hour period.

• 1-Hour OFF Timer

This timer can be set to automatically turn off the
unit at any time after one hour.

• Night Setback

This function saves energy by controlling
operation to provide a quieter operating sound
than normal.

• Automatic and 3-step Fan Speed

Auto/High/Medium/Low

• Air Sweep Control

This function moves a flap up and down in the air
outlet, directing air in a sweeping motion around
the room and providing comfort in every corner.

• Auto. Flap Control

This automatically sets the flap to the optimum
position during heating, cooling, and drying
operation.

• Hot Start Heating System

Right from the start, the air is warm and
comfortable. This system prevents any cold blasts
at the beginning while the heat pump is warming
up, or even defrosting.

• Automatic Restart Function for Power Failure

Even when power failure occurs, preset
programmed operation can be reactivated once
power resumes.

• High Power Operation

If not in Auto Operation, the unit operates at
maximum output for 30 minutes, regardless of the
desired temperature.
The fan speed is 1 step above “High”.

• Quiet Operation

The fan rotates slower than the fan speed setting
to provide a quieter operating sound.

• ION Operation

While it is operating, the unit generates negative
ions that freshen up the air in the room.

• Anti-Mold Filter

This unit is equipped with an anti-mold filter that
inhibits the growth of mold and bacteria.

• Air Clean Filter

An air filter that eliminates unpleasant odors and
cleans the air is available.
Purchase a replacement filter at your local dealer.
(model STK-FDXB)

2

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Contents

Page

Features............................................................................................................ 2

Product Information........................................................................................... 3

Alert Symbols.................................................................................................... 3

Installation Location .......................................................................................... 4

Electrical Requirements .................................................................................... 4

Safety Instructions............................................................................................. 4

Names of Parts ................................................................................................. 5

Using the Remote Control Unit ....................................................................... 10

Operation with the Remote Control Unit ......................................................... 12

1. Automatic Operation .............................................................................. 12

2. Manual Operation .................................................................................. 13

3. Adjusting the Fan Speed........................................................................ 14

4. Night Setback Mode............................................................................... 15

5. QUIET Mode .......................................................................................... 16

6. HIGH POWER Mode ............................................................................. 16

7. ION Mode............................................................................................... 16

Special Remarks............................................................................................. 17

Setting the Timer............................................................................................. 18

Using the 1-Hour OFF Timer .......................................................................... 20

Tips for Energy Saving.................................................................................... 20

Adjusting the Airflow Direction ........................................................................ 21

Operation without the Remote Control Unit .................................................... 22

Care and Cleaning .......................................................................................... 22

Troubleshooting............................................................................................... 25

Operating Range............................................................................................. 25

Product Information

If you have problems or questions concerning your Air Conditioner, you will
need the following information. Model and serial numbers are on the nameplate
on the bottom of the cabinet.

Model No. ______________________ Serial No. ____________________
Date of purchase ________________________________________________
Dealer’s address ________________________________________________

Phone number ________________

DECLARATION OF CONFORMITY

This product is marked « » as it satisfies EEC Directive No. 89/336/ EEC, 73/
23/EEC, 93/68/EEC and 92/31/EEC.
This declaration will become void in case of mis-usage and/or from non
observance though partial of Manufacturer’s installation and/or operating
instructions.

Alert Symbols

The following symbols used in this manual, alert you to potentially
dangerous conditions to users, service personnel or the appliance:

This symbol refers to a hazard or unsafe
practice which can result in severe
personal injury or death.

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CAUTION

This symbol refers to a hazard or unsafe
practice which can result in personal
injury or product or property damage.

3

Installation Location

• We recommend that this air conditioner be installed properly by

qualified installation technicians in accordance with the Installation
Instructions provided with the unit.

• Before installation, check that the voltage of the electric supply in your home

or office is the same as the voltage shown on the nameplate.

• Do not install this air conditioner where there are fumes or
flammable gases, or in an extremely humid space such as a
greenhouse.

• Do not install the air conditioner where excessively high heat­generating objects are placed.

Avoid: To protect the air conditioner from heavy corrosion, avoid installing the

outdoor unit where salty sea water can splash directly onto it or in
sulphurous air near a spa.

Electrical Requirements

1. All wiring must conform to the local electrical codes. Consult your dealer or a

qualified electrician for details.

2. Each unit must be properly grounded with a ground (or earth) wire or

through the supply wiring.

3. Wiring must be done by a qualified electrician.

CAUTION

Safety Instructions

• Read this Instruction Manual carefully before using this air
conditioner. If you still have any difficulties or problems, consult your
dealer for help.

• This air conditioner is designed to give you comfortable room
conditions. Use this only for its intended purpose as described in this
Instruction Manual.

• Never use or store gasoline or other flammable vapor or liquid near
the air conditioner — it is very dangerous.

• This air conditioner has no ventilator for intaking fresh air from
outdoors. You must open doors or windows frequently when you
use gas or oil heating appliances in the same room, which consume
a lot of oxygen from the air. Otherwise there is a risk of suffocation
in an extreme case.

• Do not turn the air conditioner on and off from the power mains
switch. Use the ON/OFF operation button.

• Do not stick anything into the air outlet of the outdoor unit. This is
dangerous because the fan is rotating at high speed.

• Do not let children play with the air conditioner.

• Do not cool or heat the room too much if babies or invalids are
present.

4

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Names of Parts

Air intakes

Air outlet

Remote control unit

Refrigerant tubes

OUTDOOR UNIT

INDOOR UNIT

Drain hose

Air outlet

NOTE

Air Intake Air from the room is drawn into this section and passes through air filters

Air Outlet Conditioned air is blown out of the air conditioner through the air outlet.

Remote Control Unit The wireless remote control unit controls power ON/OFF, operation mode

Refrigerant Tubes The indoor and outdoor units are connected by copper tubes through which

Drain Hose Moisture in the room condenses and drains off through this hose.

Outdoor (Condensing) Unit The outdoor unit contains the compressor, fan motor, heat exchanger coil,

This illustration is based on the external view of a standard model.
Consequently, the shape may differ from that of the air conditioner which you
have selected.

This air conditioner consists of an indoor unit and an outdoor unit. You can
control the air conditioner with the remote control unit.

which remove dust.

selection, temperature, fan speed, timer setting, and air sweeping.

refrigerant gas flows.

and other electrical components.

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5

IMPORTANT

Avoid using radio equipment
such as mobile phone near
(within 1 m) the remote
control receiver. Some radio
equipment may cause
malfunction of the unit.

If the trouble happens,
disconnect power and restart
the air conditioner after a few
minutes.

Unit Display and Operation Button

INDOOR UNIT

OPERATION lamp
TIMER lamp
QUIET lamp

ION lamp

OPERATION button

REMOTE CONTROL receiver

REMOTE CONTROL receiver This section picks up infrared signals from the remote control unit

(transmitter).

OPERATION button When the remote control cannot be used, pressing this button enables

heating and cooling operation.

Each time this button is pressed, the type of operation conducted is indicated
by the changing color of the OPERATION lamp. Press the button and select
the lamp color that suits your preference for operation.

Cooling operation

(green)

Heating operation

(red)

Stop

(lamp off)

OPERATION lamp This lamp lights when the system is in the continuous AUTO (red or green),

HEAT (red), DRY (orange), and COOL (green) mode.
The OPERATION lamp lights up red and orange alternately when the system
is defrosting.

TIMER lamp This lamp lights when the system is being controlled by the timer.

QUIET lamp This lamp lights during operation in the QUIET mode.

ION lamp This lamp lights during operation in ION mode while the indoor unit is

operating.

NOTE

6

The unit’s display lamps are dimmed during operation in the NIGHT
SETBACK mode.

OI-047-6-EG

Displayed when the

time display is set to

12-hour time.

Remote Control Unit (Display)

Displayed when transmitting data

Displayed when indoor unit sensor
is in use
Displayed when setting
temperature

Displayed when temperature is
shown

Displayed when setting timer

Symbols

(1) Operation mode

AUTO .....................................

HEAT ......................................

MILD DRY..............................

COOL.....................................

(2) Fan speed

Automatic operation ...............

HIGH .....................................

MEDIUM.................................

LOW.......................................

(4) Timer

24-hour clock with ON/OFF

program Timer........................

ON Timer................................

OFF Timer..............................

1-hour OFF Timer...................

(5) NIGHT SETBACK ..................

(6) Confirmation

of transmission .......................

(7) Auto. flap indication................

Flap angle indication ..............

(3) Temperature setting

16–30°C
When set to 28 °C

temperature indication............

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Sweep indication ....................

(8) High power operation .............

(9) Quiet operation.......................

(10) ION operation.......................

7

Remote Control Unit

Transmitter

ION button

QUIET button

FAN SPEED selector button

FLAP button

ON TIME

setting

buttons

Advance button

Return button

CANCEL button

SENSOR button

Display

Sensor

(Cover closed)

ON/OFF operation button

1 HR. TIMER button

Temperature setting buttons (TEMP.)

MODE selector button
NIGHT SETBACK button

HIGH POWER button

Advance button

Return button

OFF TIME
setting
buttons

CLOCK button

Time display selector button

ADDRESS switch

ACL button

Temperature display

selector button

NOTE

The illustration above pictures the remote control unit after the cover has
been opened.

Transmitter When you press the buttons on the remote control unit, the mark appears

in the display to transmit the setting changes to the receiver in the air
conditioner.

Sensor A temperature sensor inside the remote control unit senses the room

temperature.

Display Information on the operating conditions is displayed while the remote control

unit is switched on. If the unit is turned off, FLAP setting and FAN SPEED
setting are not displayed.

ION button : This button is for turning the negative ions generated during

operation on and off.

ON/OFF operation button This button is for turning the air conditioner on and off.

1 HR. TIMER button

(1-HOUR OFF TIMER)

: When you press this button, regardless of whether the unit is

operating or stopping, the unit operates for one hour and then shuts
down.

8

OI-047-8-EG

Remote Control Unit (continued)

Temperature setting buttons

(TEMP.)

Press the button to increase the set temperature.
Press the button to reduce the set temperature.
The temperature setting changes by 1 °C or 2 °F each time one of the TEMP.
buttons is pressed.

QUIET button : When you press this button, the fan rotates slower than the fan

speed setting to provide a quieter operating sound.

MODE selector button Use this button to select AUTO, HEAT, DRY or COOL mode.

(AUTO) : The air conditioner calculates the difference between the thermostat

setting and room temperature, and automatically selects ‘‘COOL’’ or
‘‘HEAT’’ mode as appropriate.

(HEAT) : The air conditioner makes the room warmer.

(DRY) : The air conditioner reduces the humidity in the room.

(COOL) : The air conditioner makes the room cooler.

NOTE

When multiple indoor units are used and units in other rooms are already
operating, they will be set to the same mode of operation as the operating indoor
units.

FAN SPEED selector button : The air conditioner automatically decides the fan speeds.

: High fan speed
: Medium fan speed
: Low fan speed

NIGHT SETBACK button For details, see “4. Night Setback Mode”. When you press this button in the

HEAT, DRY or COOL mode, the mark appears in the display, and the
remote control unit will automatically adjust the set temperature to save
energy.

FLAP button Press this button either to select the setting of the airflow direction to the

auto. flap in each mode or one of the six possible positions manually or to
select the sweep function which moves the flap up and down automatically.

: Auto flap setting: If selected in a heating operation, the flap is set to

position (3) in the following chart. If selected in a cooling or dry

operation, the flap is set at position (7) in the following chart.
: The airflow direction can be set manually. (six positions)
: The flap moves up and down automatically.

NOTE

When you press the FLAP button, the air flow direction will be changed one
by one as follows.

SWEEP

HIGH POWER button : If this button is pressed during HEAT, DRY or COOL operation, the

unit operates at maximum output for 30 minutes, regardless of the

desired temperature.

The fan speed is 1step above ‘‘HIGH’’.

ON TIME/OFF TIME setting

buttons

No display: The timer does not operate.

: The air conditioner starts at the set time.
: The air conditioner stops at the set time.

: The air conditioner stops and starts, or starts and stops, at

the set times every day. For details, see “Setting the Timer”.

OI-047-9-EG

9

Remote Control Unit (continued)

SENSOR button When you press this button (use a small-tipped object such as a ballpoint

pen), the mark will appear at the display. And the room temperature is
detected by the sensor which is built into the indoor unit and the air
conditioner is controlled accordingly.

NOTE

Temperature Display Selector

button

Time Display Selector button This switches the time display between 24-hour time and 12-hour time.

ACL button (ALL CLEAR) Puts the remote control unit into pre-operation status. Always press this

ADDRESS switch • The address switch changes to prevent mixing of signals from remote

NOTE

The remote control unit sends the temperature signal to the air conditioner regularly at five minute
intervals. If the signal from the remote control unit stops for more than 15 minutes due to the loss of
the remote control unit or other trouble, the air conditioner will switch to the temperature sensor which
is built into the indoor unit and control the room temperature. In these cases, the temperature around
the remote control unit may differ from the temperature detected at the air conditioner’s position.

If the remote control is located near a heat source, such as a space heater or in
direct sunlight, press the SENSOR button to switch to the sensor on the indoor
unit.

This switches the temperature display between °C and °F.

button after replacing the batteries.

control units when two air conditioners are installed next to each other.
Normally, the address switch is set to A. For more information, please
contact the dealer where you made the purchase.

• Normally, the tabs on the remote control unit should not be bent.

Using the Remote Control Unit

How to Install Batteries

ACL button

NOTE

1. Slide the cover in the direction

indicated by the arrow and remove it.

2. Install two AAA alkaline batteries.

Make sure the batteries point in the
direction marked in the battery
compartment.

3. Use a thin object such as the tip of a

pen to press the ACL button.

• The batteries last about six months, depending on how much you
use the remote control unit. Replace the batteries when the remote
control unit’s display fails to light, or when the remote control cannot
be used to change the air conditioner’s settings.

• Use two fresh leak-proof type-AAA alkaline batteries.

• In replacing batteries, follow the instructions as mentioned in the
sub-section “How to Install Batteries”.

• If you do not use the remote control unit more than 1 month, take out
the batteries.

10

OI-047-10-EG

Using the Remote Control Unit (continued)

How to Use the Remote

Control Unit

Remote Control Unit

Installation Position

DO NOT • In direct sunlight

When using the remote control unit, always point the unit’s transmitter head
directly at the air conditioner’s receiver.

Air conditioner
(Indoor unit)

Receiver

Remote control

(Transmitter head)

unit

The remote control unit may be operated either from a non-fixed position or
from a wall-mounted position. To ensure that the air conditioner operates
correctly, DO NOT install the remote control unit in the following places:

• Behind a curtain or other places where it is covered

• More than 8 m away from the air conditioner

• In the path of the air conditioner’s airstream

• Where it may become extremely hot or cold

• Where it may be subject to electrical or magnetic noise

• Where there is an obstacle between the remote control unit and air
conditioner (since a check signal is sent from the remote control unit every
5 minutes)

Mounting the Remote Control

Unit

Mounting screws

4 x 16 (included)

When Holding the Remote

Control Unit

Before mounting the remote control unit, press the ON/OFF operation button
at the mounting location to make sure that the air conditioner operates from
that location. The indoor unit should make a beeping sound to indicate that it
has received the signal.

Remote control

Rear side

unit mount

Press

Set in
place

Hole

• To prevent loss of the remote control
unit, you can connect the remote
control unit to the mount by passing
a string through the remote control
unit and attachment hole.

To take out the remote control unit, pull it forward.

• When using the remote control unit and during air conditioner operation,
the transmitter on the remote control unit should be pointed toward the
receiver on the indoor unit.

• Make sure that there are no objects between the remote control unit and
receiver which could block the signal.

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11

Operation with the Remote Control
Unit

1. Automatic Operation

The air conditioner calculates the difference between the thermostat setting
and room temperature, and automatically selects ‘‘COOL’’ or ‘‘HEAT’’ mode as
appropriate.

STEP 2

STEP 1

NOTE

NOTE

Check that the circuit breaker on the power panel is turned on.

Once mode is selected and the unit is preset by following the steps below,
you can have the air conditioner automatically bring the room to the desired
temperature simply by pressing the ON/OFF operation button.

STEP 1 Press the MODE selector button to .

STEP 2 Press the ON/OFF operation button.

To stop the air conditioner, press the ON/OFF operation button again.

• To change the temperature setting; press the temperature setting buttons
and change the setting to the desired temperature.

12

OI-047-12-EG

2. Manual Operation

Operation with the Remote Control Unit (continued)

STEP 2

STEP 3

STEP 1

STEP 4

NOTE

STEP 5

Check that the circuit breaker on the power panel is turned on.

If the automatic operation settings of the unit do not meet your needs, press
the setting buttons as described below and change the settings as desired.

STEP 1 Press the MODE selector button and select the desired

mode.

For heating operation →
For dehumidifying operation →
For cooling operation →

STEP 2 To start the air conditioner, press the ON/OFF operation

button.

STEP 3 Press the TEMP. setting buttons to change the temperature

setting to the desired temperature.
Adjustable temperature range:

30 °C max.

16 °C min.

or 86 °F max.

60 °F min.

STEP 4 Set the FAN SPEED selector button to the setting you want.

STEP 5 Press the FLAP button and set the airflow direction as

desired.
(Refer to “Adjusting the Airflow Direction” on page 21.)

NOTE

OI-047-13-EG

To stop the air conditioner, press the ON/OFF operation button again.

When multiple indoor units are used and units in other rooms are already
operating, they will be set to the same mode of operation as the operating indoor
units.

13

Operation with the Remote Control Unit (continued)

NOTE

• Choose the best position in the room for the remote control unit, which
also acts as the sensor for room comfort and transmits the operating
instructions. Once you’ve found this best position, always keep the remote
control unit there.

• This appliance has a built-in 5-minute time delay circuit to ensure reliable
operation. When the operation button is pressed, the compressor will start
running within three minutes. In the event of power failure, the unit will
stop.

3. Adjusting the Fan Speed

A. Automatic fan speed Simply set the FAN SPEED selector button to the position.

This automatically sets the best fan speed for the room temperature.

B. Manual fan speed If you want to adjust fan speed manually during operation, just set the FAN

SPEED selector button as desired. [ , , or ]

14

OI-047-14-EG

4. Night Setback Mode

Operation with the Remote Control Unit (continued)

Night Setback Mode is used for saving energy.

Press the NIGHT SETBACK button while operation.
The mark appears in the display.

To release the night setback function, press the NIGHT SETBACK button
again.

A. In Cooling and DRY

Mode: ( and )

B. In Heating Mode: ( )

When the night setback mode is selected, the air conditioner automatically
raises the temperature setting 1 °C when 30 minutes have passed after the
selection was made, and then another 1 °C after another 30 minutes have
passed, regardless of the indoor temperature when night setback was
selected. This enables you to save energy without sacrificing comfort. This
function is convenient when gentle cooling is needed.

1°C (2°F)

Setting
temperature

Press the NIGHT

1°C (2°F)

30 min.

30 min.

Time

SETBACK button

When the night setback mode is selected, the air conditioner automatically
lowers the temperature setting 2 °C when 30 minutes have passed after the
selection was made, and then another 2 °C after another 30 minutes have
passed, regardless of the indoor temperature when night setback was
selected. This enables you to save energy without sacrificing comfort. This
function is convenient when gentle heating is needed.

OI-047-15-EG

Setting
temperature

Press the NIGHT
SETBACK button

30 min.

2°C (4°F)

30 min.

2°C (4°F)

Time

15

5. QUIET Mode

6. HIGH POWER Mode

Operation with the Remote Control Unit (continued)

QUIET Mode is used to reduce the fan sound of the indoor unit.

Press the QUIET button.
The mark appears in the display.

To cancel, press QUIET button again.

• In QUIET Mode, the fan rotates at a slower speed than the fan speed
setting.

• If the unit is already operating with a very low airflow, the fan sound may
not change even if the QUIET button is pressed.

HIGH POWER mode can be used to increase the output of the indoor unit for
all operation modes except automatic operation.

7. ION Mode

Press the HIGH POWER button.
The mark appears in the display.

To cancel, press HIGH POWER button again.

• When the HIGH POWER button is pressed, the unit operates at maximum
output for 30 minutes, regardless of the desired temperature. The fan
speed is 1 step above “High”.

• HIGH POWER Mode cannot be used when the operation mode is
Automatic Operation.

• QUIET Mode and HIGH POWER Mode cannot be used at the same time.

NOTE

• When set to High fan speed during heating operation, the
fan runs at High fan speed even though the mark is
displayed.

• Depending on the operating conditions, the fan speed may
be increased by a small amount only.

The ION mode is used during operation to generate negative ions that
freshen up the air in the room.

Press the ION button.
The mark appears in the display.

To cancel, press ION button again.

16

• The indoor unit’s ION lamp lights up while negative ions are being
generated.

• ION “on” is the remote control unit’s initial setting.

• The negative ions are generated from the negative ion generator.

OI-047-16-EG

Special Remarks

‘‘DRY’’ ( ) Operation

How it works? • Once the room temperature reaches the level that was set, the unit’s

operation frequency is changed automatically.

• During DRY operation, the fan speed automatically runs at lower speed for
providing a comfortable breeze.

• ‘‘DRY’’ operation is not possible if the indoor temperature is 15 °C or less.

Heating ( ) Operation

Heating performance • Because this air conditioner heats a room by drawing in the heat of the

outside air (heat pump system), the heating efficiency will fall off when the
outdoor temperature is very low. If sufficient heat cannot be obtained with
this air conditioner, use another heating appliance together with it.

Defrosting • When the outdoor temperature is low, frost or ice may form on the heat

exchanger coil, reducing heating performance. When this happens, a
microcomputer defrosting system operates. At the same time, the fan on
the indoor unit stops and the OPERATION lamp lights red and orange
alternately until defrosting is completed. Heating operation restarts after
several minutes. (This interval will vary slightly depending upon the
outdoor temperature and the way in which frost forms.)

Cold draft prevention • For several minutes after the start of heating operation, the indoor fan runs

at a lower speed until the indoor heat exchanger coil has warmed up
sufficiently. However, the fan may remain stopped when the room
temperature is low. This is because the COLD DRAFT PREVENTION
SYSTEM is in operation.

Power failure during

operation

Clicking Sound

Clicking sound is heard from

the air conditioner

Remote Control Unit

• In the event of power failure, the unit will stop. When the power is
resumed, the unit will restart automatically within 15 minutes by the
remote control unit.

• In heating or cooling operation, any plastic parts may expand or shrink due
to a sudden temperature change. In this event, a clicking sound may occur.
This is normal, and the sound will soon disappear.

• The remote control unit sends the setting condition signals to the air
conditioner regularly at five minute intervals.

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17

Setting the Timer

NOTE

1. How to set the present
time

In the descriptions below, the following settings are used for the temperature
and time indicator selector button on the bottom front section of the remote
control.

• Temperature: °C

• Time: AM, PM

(Example) To set to 10:30 pm.

Operation Indication

1. Press the CLOCK button once if

the time indicator is not flashing.

2. Press the Advance, Return ( ,

) button until PM 10:30 is

displayed.

3. Press the CLOCK button again. This completes the setting of the

The time indication alone flashes.

The time can be set in 1-minute
increments. Holding down the
button advances the time rapidly in
10-minute increments.

current time.

2. How to set the OFF time

18

(Example) To stop the air conditioner at 11:00 am.

1. Press the OFF TIME setting

button once.

The timer indication is
displayed, and the present OFF
time is shown.

2. Press the Advance, Return ( ,

) button until AM 11:00 is

displayed.

The timer indication blinks.
The time can be set in 10-minute
increments. Holding down the
button advances the time rapidly in
10-minute increments.

3. Wait a few seconds, and then

the setting is complete.

The timer indication stops
blinking and the present time is
displayed.

OI-047-18-EG

Setting the Timer (continued)

3. How to set the ON time

4. How to set DAILY ON/OFF
REPEAT timer

(Example) To start operation at 7:10 am.

Operation Indication

1. Press the ON TIME setting

button once.

The timer indication is
displayed, and the present ON time
is shown.

2. Press the Advance, Return ( ,

) button until AM 7:10 is

displayed.

The timer indication blinks.
The time can be set in 10-minute
increments. Holding down the
button advances the time rapidly in
10-minute increments.

3. Wait a few seconds, and then

the setting is complete.

The timer indication stops
blinking and the present time is
displayed.

(Example) To start operation at 7:10 am. and stop the air conditioner at 11:00
am.

10:30 pm.

Present time

7:10 am.

ON

11:00 am.

OFF

1. Set the timer ON/OFF times as

shown in 2-1, 2, 3 and 3-1, 2, 3.

NOTE

• The ON/OFF combination timer uses the current time as
the reference, and it is activated starting from whichever
set time comes first.

• With the ON/OFF combination timer, the settings are
repeated every day.

• You can check the timer ON/OFF times after you have set
them by pressing the ON TIME and OFF TIME setting
buttons.

To cancel a timer program • Press the CANCEL button.

• When either an ON or OFF timer is to be canceled, press the button
corresponding to the timer whose program is to be canceled, and then
press the CANCEL button.

NOTE

• The airflow direction, fan speed and temperature setting can be changed
after a timer program has been set even when the unit is stopped. Even
when operation is stopped during an ON timer program, the unit will start
operating when the set time is reached provided that the program is not
canceled.

• When the ON timer and OFF timer are set to the same time, the timer
operates as if it is turned off.

The present time 10:30 pm. and

are displayed.

OI-047-19-EG

19

Using the 1-Hour OFF Timer

1. 1-Hour OFF Timer This function causes the unit to operate for one hour and then stop,
regardless of whether the unit is on or off when this button is pressed.

The indicator in the display indicates that this function is operating.

Setting procedure:

Regardless of whether the unit is operating or stopped, press the 1 HR.
TIMER button.

appears in the display.

Cancellation procedure:

Press the ON/OFF operation button to turn the unit off, wait for the unit to stop
operating, and then press the ON/OFF operation button again.
The 1-Hour Timer function is now cancelled and the unit operates normally.

NOTE

2. Operation together with the
DAILY ON/OFF REPEAT Timer

Do not • Block the air intake and outlet of the unit. If they are obstructed, the

Do • Always try to keep the air filter clean. (Refer to “Care and Cleaning”.) A

• If, while the 1-Hour Timer function is operating, the 1HR. TIMER button is

pressed once to cancel the function and then again, the unit continues to
operate for one hour from that point in time and then stops.

• It is not possible to use the OFF Timer and 1-Hour OFF Timer together.

Whichever function is set last takes precedence. If the 1 HR. TIMER
button is pressed while the TIMER OFF function operates, the OFF Timer
is cancelled and the unit will stop operating one hour later.

The 1-Hour OFF Timer setting is given priority over the DAILY ON/OFF
REPEAT setting.

Tips for Energy Saving

unit will not work well, and may be damaged.

• Let direct sunlight into the room. Use sunshades, blinds or curtains. If the

walls and ceiling of the room are warmed by the sun, it will take longer to
cool the room.

clogged filter will impair the performance of the unit.

• To prevent conditioned air from escaping, keep windows, doors and any

other openings closed.

20

OI-047-20-EG

Adjusting the Airflow Direction

1. Horizontal The horizontal airflow can be adjusted by moving the vertical vanes with your

hands to the left or right.

CAUTION

2. Vertical The vertical airflow can be adjusted by moving the flap with the remote

A. Sweep function

The flap starts moving up and down to
deliver air over the sweep range.

C. Auto flap function

The flap is set to the recommended
position.

When the humidity is high, the vertical vanes should be in the front
position during the cooling or dehumidifying operation. If the vertical
vanes are positioned all of the way to the right or left, condensation
may begin to form around the air vent and drip down.

control unit. Do not move the flap with your hands. Confirm that the remote
control unit has been turned on. Use the FLAP button to set either the sweep
function or one of the six airflow direction settings.

SWEEP

COOL

DRY

B. Setting the airflow manually

Referring to the above illustration, use the
FLAP button to set the airflow direction
within the range used during the heating,
cooling, or dehumidifying operation.

SWEEP

HEAT

NOTE

CAUTION

OI-047-21-EG

• The flap automatically closes when the unit is off.

• During the heating operation, the fan speed will be very low and the flap

will be in the horizontal position (position ) until the air being blown out
of the unit begins to warm. Once the air warms up, the flap position and
fan speed change to the settings specified with the remote control.

• Use the FLAP button on the remote control to adjust the position of

the flap. If you move the flap by hand, the flap position according to
the remote control and the actual flap position may no longer match.
If this should happen, shut off the unit, wait for the flap to close, and
then turn on the unit again; the flap position will now be normal
again.

• Do not have the flap pointed down during cooling operation.

Condensation may begin to form around the air vent and drip down.

21

Operation without the Remote
Control Unit

INDOOR UNIT If you have lost the remote control unit or it has trouble, follow the steps

below.

When the air conditioner is not running

Each time the OPERATION button is pressed, the type of operation
conducted is indicated by the changing color of the OPERATION lamp. Press
the button and select the lamp color that suits your preference for operation.

OPERATION button

NOTE

Cooling operation

(green)

The temperature is set to the room temperature minus 2°C during the cooling
operation and to the room temperature plus 2°C during the heating operation,
and the fan speed and flap are set to Auto.

Heating operation

(red)

Stop

(lamp off)

Care and Cleaning

1. For safety, be sure to turn the air conditioner off and also to
disconnect the power before cleaning.

2. Do not pour water on the indoor unit to clean it. This will damage the
internal components and cause an electric shock hazard.

Casing and Grille (Indoor Unit) Clean the casing and grille of the indoor unit with a vacuum cleaner brush, or

wipe them with a clean, soft cloth.

If these parts are stained, use a clean cloth moistened with a mild liquid
detergent. When cleaning the grille, be careful not to force the vanes out of
place.

CAUTION

22

1. Never use solvents, or harsh chemicals when cleaning the indoor
unit. Do not wipe the plastic casing using very hot water.

2. Some metal edges and the fins are sharp and may cause injury if
handled improperly; be especially careful when you clean these
parts.

3. The internal coil and other components of the outdoor unit must be
cleaned every year. Consult your dealer or service center.

OI-047-22-EG

Care and Cleaning (continued)

Anti-Mold Filter The anti-mold filter behind the air intake grille should be checked and cleaned

at least once every two weeks.

How to remove the anti-mold

filter

Cleaning Use a vacuum cleaner to remove light dust. If there is sticky dust on the filter,

How to replace the anti-mold

filter

1. Grasp both ends of the air

Air intake grille

intake grille, and remove it
by opening towards the
front and pulling towards
you.

2. Remove the anti-mold filter
attached to the rear of the

Anti-mold filter

air intake grille.

wash the filter in lukewarm, soapy water, rinse it in clean water, and dry it.

1. With the FRONT mark of
the anti-mold filter at the

Anti-mold filter

front, align the two
indentions near the mark
with the hooks at the rear
of the air intake grille, and
then mount the anti-mold
filter.

FRONT mark

Hook

NOTE

OI-047-23-EG

2. Allow the edge of the air
intake grille to slide into the
top of the indoor unit, and
then insert it all the way
inside.

3. Press in the bottom right

Air intake grille

Groove

Pin

Air intake grille

and left corners of the air
intake grille to attach the
indoor unit.

Attach so that the round pins at the top right and left corners of the air intake
grille are inserted into the grooves at the top right and left of the indoor unit.

23

Care and Cleaning (continued)

Air Clean Filter The air clean filter removes dust and dirt from the air, and reduces odors and

smoke from tobacco.

This air clean filter cannot remove harmful gases or vapors nor ventilate
air in the room. You must open doors or windows frequently when you
use gas or oil heating appliances. Otherwise there is a risk of
suffocation in extreme cases.

How to install the air clean

filter

The air clean filter needs to be
installed behind the air intake grille.

1. Remove the air intake grille.

2. Install the air clean filter in

the position shown in the
figure.

3. Remount the air intake grille.

Air clean filter

How to clean the air clean filter • In general, the filter should be sucked to remove dust in low fan speed of a

vacuum cleaner once every three months.

• If there is heavily grime on the filter, soak the filter in lukewarm water with
neutral detergent diluted 1:500 for 1 to 2 minutes then wash it.

• Rinse the filter in clean water, then let it dry on the towel in room temperature.

NOTE

• Do not bend nor give excessive force onto the air clean filter.

• If the filter surface is heavily blocked with dirt or damaged, replace it with new
one. Purchase a replacement filter at your local dealer. (model STK-FDXB)

Cleaning the main unit and

remote control unit

• Wipe clean using a soft, dry cloth.

• To remove stubborn dirt, moisten a cloth in warm water no hotter than
40 °C, wring thoroughly, and then wipe.

• The air intake grille can be removed in order to wash it with water.

Removing and remounting the

air intake grille

Refer to “How to remove the anti-mold filter” and “How to replace the anti­mold filter” on page 23.

When using a footstool or the like, be careful not to let it tip over.

CAUTION

Washing the grille with water • Clean the grille gently using a soft sponge, or the like. Then wipe away any

remaining moisture.

• Neutral detergent may be used to remove stubborn dirt. Then rinse
thoroughly with water and wipe away any remaining moisture.

Cleaning the negative ion

generator

Follow the steps below when the
generator has become dirty.

For safety, be sure to turn the air
conditioner off and also to disconnect
the power before cleaning.

Remove the dust on the negative ion
generator.

• Use a toothbrush, etc. to dust off the
end.

• Use a cotton swab, etc., to clean around
the generator inside the plastic case,

Negative ion generator
(metal electrodes inside plastic case)

taking care not to touch the electrodes.

NOTE

• During use, the negative ion generator and other metal parts may become
discolored: this is normal and not indicative of malfunctioning.

• If the dirt on and around the negative ion generator is left to build up, a
puffing or sputtering sound will eventually be heard. In this case, clean the
generator immediately.

• Do not apply excessive force while performing maintenance.

24

OI-047-24-EG

Troubleshooting

If your air conditioner does not work properly, first check the following points before requesting service. If it still does
not work properly, contact your dealer or service center.

Trouble Possible Cause Remedy

Air conditioner does not run at all. 1. Power failure. 1. Restore power.

2. Leakage circuit breaker tripped.

3. Line voltage is too low. 3. Consult your electrician or dealer.

2. Contact service center.

4. Batteries in remote control unit
have run down.

OPERATION lamp blinks and air
conditioner does not operate.

Compressor runs but soon stops. Obstruction in front of condenser coil. Remove obstruction.

Poor cooling (or heating)
performance.

Clicking sound is heard from the air
conditioner.

Trouble in system. Contact service center.

1. Dirty or clogged air filter. 1. Clean air filter to improve airflow.

2. Heat source or many people in
room.

3. Doors and/or windows are open. 3. Shut them to keep the heat (or

4. Obstacle near air intake or air
discharge port.

5. Thermostat is set too high for
cooling (or too low for heating).

6. (Outdoor temperature is too low for
heating.)

In heating or cooling operation, any
plastic parts may expand or shrink
due to a sudden temperature change.
In this event, a clicking sound may
occur.

4. Replace batteries.

2. Eliminate heat source if possible.

cold) out.

4. Remove it to ensure good airflow.

5. Set the temperature lower (or
higher).

6. (Consult your dealer or try to use
another heat appliance.)

This is normal, and the sound will
soon disappear.

OPERATION lamp lights but outdoor
unit will not run.

The use of cellular phones near the
air conditioner may cause
disturbance to its normal operation.

1. Turn off the power then restart the
air conditioner after a while.

2. Consult your dealer.

Operating Range

The air conditioner is operable within the temperature ranges as listed below:

Temperature Indoor air temperature Outdoor air temperature

COOLING Max. 32 °C DB / 23 °C WB 43 °C DB

Min. 19 °C DB / 14 °C WB 19 °C DB

HEATING Max. 27 °C DB 24 °C DB / 18 °C WB

Min. 16 °C DB – DB/ –15 °C WB

OI-047-25-EG

25

INSTRUCTION MANUAL

MCAF188R5I
MCAF248R5I

(OI-852-6-4181-048-00-0)

APPENDIX B

A-2

OPERATING INSTRUCTIONS • INSTRUCCIONES DE USO

NOTICE D’UTILISATION • BEDIENUNGSANLEITUNG

ISTRUZIONI D’USO

This air conditioner uses the new refrigerant R410A

MCAF188R5I
MCAF248R5I

Save These Instructions• Guardéis estas instrucciones

Conserver ce notice d’utilisation• Bewahren Sie bitte diese Bedienungsanleitung auf

Split air conditioner system • Acondicionador de aire de consola partida sistema split

Climatiseurs split • Split-klimagerät • Condizionatore d’aria split system

Pub. OI-85264181048000

Conservate queste istruzioni

12/2007

Features

This air conditioner is an inverter type unit that automatically adjusts capability as appropriate. Details on these
functions are provided below; refer to these descriptions when using the air conditioner.

• Microprocessor Controlled Operation

The interior compartment of the remote control
unit contains several features to facilitate
automatic operation, easy logically displayed for
easy use.

• Simple One-touch Wireless Remote Control

The remote control unit has several features to
facilitate automatic operation.

• 24-Hour ON or OFF Timer

This timer can be set to automatically turn the
unit on or off at any time within a 24 hour period.

• 1-Hour OFF Timer

This timer can be set to automatically turn off the
unit at any time after one hour.

• Night Setback

This function saves energy by controlling
operation to provide a quieter operating sound
than normal.

• Automatic and 3-step Fan Speed

Auto/High/Medium/Low

• Air Sweep Control

This function moves a flap up and down in the air
outlet, directing air in a sweeping motion around
the room and providing comfort in every corner.

• Auto. Flap Control

This automatically sets the flap to the optimum
position during heating, cooling, and drying
operation.

• Automatic Switching between Cooling and
Heating

When the remote control’s S/M switch is at the
“S” (Single) position

This unit automatically switches between cooling
operation and heating operation according to the
difference between the room temperature and the
temperature setting.

When the remote control’s S/M switch is at the
“M” (Multiple) position

Unlike when the switch is at the “S” position as
described above, the function for automatically
switching between cooling and heating does not
work.

• Hot Start Heating System

Right from the start, the air is warm and
comfortable. This system prevents any cold blasts
at the beginning while the heat pump is warming
up, or even defrosting.

• Automatic Restart Function for Power Failure

Even when power failure occurs, preset
programmed operation can be reactivated once
power resumes.

• High Power Operation

If not in Auto Operation, the unit operates at
maximum output for 30 minutes, regardless of the
desired temperature.
The fan speed is 1 step above “High”.

• Quiet Operation

The fan rotates slower than the fan speed setting
to provide a quieter operating sound.

• ION Operation

While it is operating, the unit generates negative
ions that freshen up the air in the room.

• Anti-Mold Filter

This unit is equipped with an anti-mold filter that
inhibits the growth of mold and bacteria.

• Air Clean Filter

An air filter that eliminates unpleasant odors and
cleans the air is available.
Purchase a replacement filter at your local dealer.
(model STK-FDXB)

IMPORTANT

• “Single use” means that only one indoor unit is connected with one outdoor unit in a one-unit-to­one-unit configuration and that the remote control's S/M switch is at the “S” (Single) position.

• “Multiple use” means that two or more indoor units are connected with one outdoor unit in a
multiple-unit-to-one-unit configuration and that the remote control’s S/M switch is at the “M”
(Multiple) position. (Refer to “Using the Remote Control Unit” on page 10.)

2

OI-048-2-EG

Contents

Page

Features............................................................................................................ 2

Product Information........................................................................................... 3

Alert Symbols.................................................................................................... 3

Installation Location .......................................................................................... 4

Electrical Requirements .................................................................................... 4

Safety Instructions............................................................................................. 4

Names of Parts ................................................................................................. 5

Using the Remote Control Unit ....................................................................... 10

Operation with the Remote Control Unit ......................................................... 12

1. Automatic Operation .............................................................................. 12

2. Manual Operation .................................................................................. 13

3. Adjusting the Fan Speed........................................................................ 14

4. Fan Only................................................................................................. 14

5. Night Setback Mode............................................................................... 15

6. QUIET Mode .......................................................................................... 16

7. HIGH POWER Mode ............................................................................. 16

8. ION Mode............................................................................................... 16

Special Remarks............................................................................................. 17

Setting the Timer............................................................................................. 18

Using the 1-Hour OFF Timer .......................................................................... 20

Tips for Energy Saving.................................................................................... 20

Adjusting the Airflow Direction ........................................................................ 21

Operation without the Remote Control Unit .................................................... 22

Care and Cleaning .......................................................................................... 22

Troubleshooting............................................................................................... 25

Operating Range............................................................................................. 25

Product Information

If you have problems or questions concerning your Air Conditioner, you will
need the following information. Model and serial numbers are on the nameplate
on the bottom of the cabinet.

Model No. ______________________ Serial No. ____________________
Date of purchase ________________________________________________
Dealer’s address ________________________________________________

Phone number ________________

DECLARATION OF CONFORMITY

This product is marked « » as it satisfies EEC Directive No. 89/336/ EEC, 73/
23/EEC, 93/68/EEC and 92/31/EEC.
This declaration will become void in case of mis-usage and/or from non
observance though partial of Manufacturer’s installation and/or operating
instructions.

Alert Symbols

The following symbols used in this manual, alert you to potentially
dangerous conditions to users, service personnel or the appliance:

This symbol refers to a hazard or unsafe
practice which can result in severe
personal injury or death.

OI-048-3-EG

CAUTION

This symbol refers to a hazard or unsafe
practice which can result in personal
injury or product or property damage.

3

Installation Location

• We recommend that this air conditioner be installed properly by

qualified installation technicians in accordance with the Installation
Instructions provided with the unit.

• Before installation, check that the voltage of the electric supply in your home

or office is the same as the voltage shown on the nameplate.

• Do not install this air conditioner where there are fumes or
flammable gases, or in an extremely humid space such as a
greenhouse.

• Do not install the air conditioner where excessively high heat­generating objects are placed.

Avoid: To protect the air conditioner from heavy corrosion, avoid installing the

outdoor unit where salty sea water can splash directly onto it or in
sulphurous air near a spa.

Electrical Requirements

1. All wiring must conform to the local electrical codes. Consult your dealer or a

qualified electrician for details.

2. Each unit must be properly grounded with a ground (or earth) wire or

through the supply wiring.

3. Wiring must be done by a qualified electrician.

CAUTION

Safety Instructions

• Read this Instruction Manual carefully before using this air
conditioner. If you still have any difficulties or problems, consult your
dealer for help.

• This air conditioner is designed to give you comfortable room
conditions. Use this only for its intended purpose as described in this
Instruction Manual.

• Never use or store gasoline or other flammable vapor or liquid near
the air conditioner — it is very dangerous.

• This air conditioner has no ventilator for intaking fresh air from
outdoors. You must open doors or windows frequently when you
use gas or oil heating appliances in the same room, which consume
a lot of oxygen from the air. Otherwise there is a risk of suffocation
in an extreme case.

• Do not turn the air conditioner on and off from the power mains
switch. Use the ON/OFF operation button.

• Do not stick anything into the air outlet of the outdoor unit. This is
dangerous because the fan is rotating at high speed.

• Do not let children play with the air conditioner.

• Do not cool or heat the room too much if babies or invalids are
present.

4

OI-048-4-EG

Names of Parts

Air intakes

Air outlet

Remote control unit

Refrigerant tubes

OUTDOOR UNIT

INDOOR UNIT

Drain hose

Air outlet

NOTE

Air Intake Air from the room is drawn into this section and passes through air filters

Air Outlet Conditioned air is blown out of the air conditioner through the air outlet.

Remote Control Unit The wireless remote control unit controls power ON/OFF, operation mode

Refrigerant Tubes The indoor and outdoor units are connected by copper tubes through which

Drain Hose Moisture in the room condenses and drains off through this hose.

Outdoor (Condensing) Unit The outdoor unit contains the compressor, fan motor, heat exchanger coil,

This illustration is based on the external view of a standard model.
Consequently, the shape may differ from that of the air conditioner which you
have selected.

This air conditioner consists of an indoor unit and an outdoor unit. You can
control the air conditioner with the remote control unit.

which remove dust.

selection, temperature, fan speed, timer setting, and air sweeping.

refrigerant gas flows.

and other electrical components.

OI-048-5-EG

5

IMPORTANT

Avoid using radio equipment
such as mobile phone near
(within 1 m) the remote
control receiver. Some radio
equipment may cause
malfunction of the unit.

If the trouble happens,
disconnect power and restart
the air conditioner after a few
minutes.

Unit Display and Operation Button

INDOOR UNIT

OPERATION lamp
TIMER lamp
QUIET lamp

ION lamp

OPERATION button

REMOTE CONTROL receiver

REMOTE CONTROL receiver This section picks up infrared signals from the remote control unit

(transmitter).

OPERATION button When the remote control cannot be used, pressing this button enables

heating and cooling operation.

Each time this button is pressed, the type of operation conducted is indicated
by the changing color of the OPERATION lamp. Press the button and select
the lamp color that suits your preference for operation.

Cooling operation

(green)

Heating operation

(red)

Stop

(lamp off)

OPERATION lamp This lamp lights when the system is in the continuous AUTO (red or green),

HEAT (red), DRY (orange), COOL (green) and FAN (green) mode (but no
FAN mode at M of the S/M switch on the remote control unit).
The OPERATION lamp lights up red and orange alternately when the system
is defrosting.

TIMER lamp This lamp lights when the system is being controlled by the timer.

QUIET lamp This lamp lights during operation in the QUIET mode.

ION lamp This lamp lights during operation in ION mode while the indoor unit is

operating.

NOTE

6

The unit’s display lamps are dimmed during operation in the NIGHT
SETBACK mode.

OI-048-6-EG

Displayed when the

time display is set to

12-hour time.

Remote Control Unit (Display)

Displayed when transmitting data

Displayed when indoor unit sensor
is in use
Displayed when setting
temperature

Displayed when temperature is
shown

Displayed when setting timer

Symbols

(1) Operation mode

AUTO .....................................

HEAT ......................................

MILD DRY..............................

COOL.....................................

FAN ........................................

(2) Fan speed

Automatic operation ...............

HIGH .....................................

MEDIUM.................................

(4) Timer

24-hour clock with ON/OFF

program Timer........................

ON Timer................................

OFF Timer..............................

1-hour OFF Timer...................

(5) NIGHT SETBACK ..................

(6) Confirmation of transmission..

(7) Auto. flap indication................

Flap angle indication ..............

LOW.......................................

(3) Temperature setting

16–30°C
When set to 28 °C

temperature indication............

OI-048-7-EG

Sweep indication ....................

(8) High power operation .............

(9) Quiet operation.......................

(10) ION operation.......................

7

Remote Control Unit

Transmitter

ION button

QUIET button

FAN SPEED selector button

FLAP button

ON TIME

setting

buttons

Advance button

Return button

CANCEL button

SENSOR button

Display

Sensor

(Cover closed)

ON/OFF operation button

1 HR. TIMER button

Temperature setting buttons (TEMP.)

MODE selector button
NIGHT SETBACK button

HIGH POWER button

Advance button

Return button

OFF TIME
setting
buttons

CLOCK button
Time display selector button

ADDRESS switch

ACL button

Temperature display

selector button

NOTE

The illustration above pictures the remote control unit after the cover has
been opened.

Transmitter When you press the buttons on the remote control unit, the mark appears

in the display to transmit the setting changes to the receiver in the air
conditioner.

Sensor A temperature sensor inside the remote control unit senses the room

temperature.

Display Information on the operating conditions is displayed while the remote control

unit is switched on. If the unit is turned off, FLAP setting and FAN SPEED
setting are not displayed.

ION button : This button is for turning the negative ions generated during

operation on and off.

ON/OFF operation button This button is for turning the air conditioner on and off.

1 HR. TIMER button

(1-HOUR OFF TIMER)

: When you press this button, regardless of whether the unit is

operating or stopping, the unit operates for one hour and then shuts
down.

8

OI-048-8-EG

Remote Control Unit (continued)

Temperature setting buttons

(TEMP.)

Press the button to increase the set temperature.
Press the button to reduce the set temperature.
The temperature setting changes by 1 °C or 2 °F each time one of the TEMP.
buttons is pressed.

QUIET button : When you press this button, the fan rotates slower than the fan

speed setting to provide a quieter operating sound.

MODE selector button Use this button to select AUTO, HEAT, DRY, COOL or FAN mode.

(AUTO) : When this setting is selected, the air conditioner calculates the

difference between the thermostat setting and the room temperature
and automatically switches to the ‘‘COOL’’ or ‘‘HEAT’’ mode as
appropriate except at “M” of the Single/Multiple switch.

(HEAT) : The air conditioner makes the room warmer.

(DRY) : The air conditioner reduces the humidity in the room.

(COOL) : The air conditioner makes the room cooler.

(FAN) : The air conditioner works only as a circulation fan except at “M” of the

Single/Multiple switch.

FAN SPEED selector button : The air conditioner automatically decides the fan speeds.

: High fan speed
: Medium fan speed
: Low fan speed

NIGHT SETBACK button For details, see “5. Night Setback Mode”. When you press this button in the

HEAT, DRY or COOL mode, the mark appears in the display, and the
remote control unit will automatically adjust the set temperature to save
energy.

FLAP button Press this button either to select the setting of the airflow direction to the

auto. flap in each mode or one of the six possible positions manually or to
select the sweep function which moves the flap up and down automatically.

: Auto flap setting: If selected in a heating operation, the flap is set to

position (3) in the following chart. If selected in a cooling or dry

operation, the flap is set at position (7) in the following chart.
: The airflow direction can be set manually. (six positions)
: The flap moves up and down automatically.

NOTE

When you press the FLAP button, the air flow direction will be changed one
by one as follows.

SWEEP

HIGH POWER button : If this button is pressed during HEAT, DRY, COOL or FAN operation,

the unit operates at maximum output for 30 minutes, regardless of the

desired temperature.

The fan speed is 1step above ‘‘HIGH’’.

ON TIME/OFF TIME setting

buttons

No display: The timer does not operate.

: The air conditioner starts at the set time.
: The air conditioner stops at the set time.

: The air conditioner stops and starts, or starts and stops, at

the set times every day. For details, see “Setting the Timer”.

OI-048-9-EG

9

Remote Control Unit (continued)

SENSOR button When you press this button (use a small-tipped object such as a ballpoint

pen), the mark will appear at the display. And the room temperature is
detected by the sensor which is built into the indoor unit and the air
conditioner is controlled accordingly.

NOTE

Temperature Display Selector button

Time Display Selector button This switches the time display between 24-hour time and 12-hour time.

ACL button (ALL CLEAR) Puts the remote control unit into pre-operation status. Always press this

ADDRESS switch • The address switch changes to prevent mixing of signals from remote

S/M (Single/Multiple switch) • Initially, the S/M switch is set to S (Single).

NOTE

NOTE

The remote control unit sends the temperature signal to the air conditioner regularly at five minute
intervals. If the signal from the remote control unit stops for more than 15 minutes due to the loss of
the remote control unit or other trouble, the air conditioner will switch to the temperature sensor which
is built into the indoor unit and control the room temperature. In these cases, the temperature around
the remote control unit may differ from the temperature detected at the air conditioner’s position.

If the remote control is located near a heat source, such as a space heater or in
direct sunlight, press the SENSOR button to switch to the sensor on the indoor unit.

This switches the temperature display between °C and °F.

button after replacing the batteries and setting the S/M switch.

control units when two air conditioners are installed next to each other.
Normally, the address switch is set to A. For more information, please
contact the dealer where you made the purchase.

• Normally, the tabs on the remote control unit should not be bent.

• Set this switch to M (Multiple) for multiple operation.

• Always press ACL button by a thin object such as the tip of a pen after
setting the S/M switch.

When multiple indoor units are used and units in other rooms are already operating,
they will be set to the same mode of operation as the operating indoor units.

How to Install Batteries

ACL button

NOTE

Using the Remote Control Unit

1. Slide the cover in the direction

indicated by the arrow and remove it.

2. Install two AAA alkaline batteries.

Make sure the batteries point in the
direction marked in the battery
compartment.

3. Use a thin object such as the tip of a

pen to press the ACL button.

• The batteries last about six months, depending on how much you
use the remote control unit. Replace the batteries when the remote
control unit’s display fails to light, or when the remote control cannot
be used to change the air conditioner’s settings.

• Use two fresh leak-proof type-AAA alkaline batteries.

• In replacing batteries, follow the instructions as mentioned in the
sub-section “How to Install Batteries”.

• If you do not use the remote control unit more than 1 month, take out
the batteries.

10

OI-048-10-EG

Using the Remote Control Unit (continued)

How to Use the Remote

Control Unit

Remote Control Unit

Installation Position

DO NOT • In direct sunlight

When using the remote control unit, always point the unit’s transmitter head
directly at the air conditioner’s receiver.

Air conditioner
(Indoor unit)

Receiver

Remote control

(Transmitter head)

unit

The remote control unit may be operated either from a non-fixed position or
from a wall-mounted position. To ensure that the air conditioner operates
correctly, DO NOT install the remote control unit in the following places:

• Behind a curtain or other places where it is covered

• More than 8 m away from the air conditioner

• In the path of the air conditioner’s airstream

• Where it may become extremely hot or cold

• Where it may be subject to electrical or magnetic noise

• Where there is an obstacle between the remote control unit and air
conditioner (since a check signal is sent from the remote control unit every
5 minutes)

Mounting the Remote Control

Unit

Remote control

unit mount

Mounting screws

4 x 16 (included)

When Holding the Remote

Control Unit

Before mounting the remote control unit, press the ON/OFF operation button
at the mounting location to make sure that the air conditioner operates from
that location. The indoor unit should make a beeping sound to indicate that it
has received the signal.

Rear side

Press

Set in
place

Hole

• To prevent loss of the remote control
unit, you can connect the remote
control unit to the mount by passing
a string through the remote control
unit and attachment hole.

To take out the remote control unit, pull it forward.

• When using the remote control unit and during air conditioner operation,
the transmitter on the remote control unit should be pointed toward the
receiver on the indoor unit.

• Make sure that there are no objects between the remote control unit and
receiver which could block the signal.

OI-048-11-EG

11

Operation with the Remote Control
Unit

1. Automatic Operation

When the remote control’s S/M switch is at the “S” (Single) position

This unit automatically switches between cooling operation and heating
operation according to the difference between the room temperature and the
temperature setting.

When the remote control’s S/M switch is at the “M” (Multiple) position

Unlike when the switch is at the “S” position as described above, the function
for automatically switching between cooling and heating does not work.

STEP 2

NOTE

NOTE

STEP 1

Check that the circuit breaker on the power panel is turned on.

Once mode is selected and the unit is preset by following the steps below,
you can have the air conditioner automatically bring the room to the desired
temperature simply by pressing the ON/OFF operation button.

STEP 1 Press the MODE selector button to .

STEP 2 Press the ON/OFF operation button.

To stop the air conditioner, press the ON/OFF operation button again.

• To change the temperature setting; press the temperature setting buttons
and change the setting to the desired temperature.

12

OI-048-12-EG

2. Manual Operation

Operation with the Remote Control Unit (continued)

STEP 2

STEP 3

STEP 1

STEP 4

NOTE

STEP 5

Check that the circuit breaker on the power panel is turned on.

If the automatic operation settings of the unit do not meet your needs, press
the setting buttons as described below and change the settings as desired.

STEP 1 Press the MODE selector button and select the desired

mode.

For heating operation →
For dehumidifying operation →
For cooling operation →

For fan only operation →
(No FAN mode at M of the S/M switch on the remote control
unit.)

STEP 2 To start the air conditioner, press the ON/OFF operation

button.

STEP 3 Press the TEMP. setting buttons to change the temperature

setting to the desired temperature.
Adjustable temperature range:

30 °C max.

16 °C min.

or 86 °F max.

60 °F min.

OI-048-13-EG

STEP 4 Set the FAN SPEED selector button to the setting you want.

STEP 5 Press the FLAP button and set the airflow direction as

desired.
(Refer to “Adjusting the Airflow Direction” on page 21.)

To stop the air conditioner, press the ON/OFF operation button again.

13

Operation with the Remote Control Unit (continued)

NOTE

• Choose the best position in the room for the remote control unit, which
also acts as the sensor for room comfort and transmits the operating
instructions. Once you’ve found this best position, always keep the remote
control unit there.

• This appliance has a built-in 5-minute time delay circuit to ensure reliable
operation. When the operation button is pressed, the compressor will start
running within three minutes. In the event of power failure, the unit will
stop.

3. Adjusting the Fan Speed

A. Automatic fan speed Simply set the FAN SPEED selector button to the position.

This automatically sets the best fan speed for the room temperature.

B. Manual fan speed If you want to adjust fan speed manually during operation, just set the FAN

SPEED selector button as desired. [ , , or ]

4. Fan Only

STEP 2

NOTE

STEP 1

STEP 3

If you want to circulate air without any temperature control, follow these steps:

STEP 1 Press the MODE selector button to switch to the fan mode

.

STEP 2 Press the ON/OFF operation button.

STEP 3 Press the FAN SPEED selector button to select the fan

speed of your choice ( , or ).

There is no FAN only function at M of the S/M switch on the remote control
unit.

14

OI-048-14-EG

5. Night Setback Mode

Operation with the Remote Control Unit (continued)

Night Setback Mode is used for saving energy.

Press the NIGHT SETBACK button while operation.
The mark appears in the display.

To release the night setback function, press the NIGHT SETBACK button
again.

A. In Cooling and DRY

Mode: ( and )

B. In Heating Mode: ( )

When the night setback mode is selected, the air conditioner automatically
raises the temperature setting 1 °C when 30 minutes have passed after the
selection was made, and then another 1 °C after another 30 minutes have
passed, regardless of the indoor temperature when night setback was
selected. This enables you to save energy without sacrificing comfort. This
function is convenient when gentle cooling is needed.

1°C (2°F)

Setting
temperature

Press the NIGHT

1°C (2°F)

30 min.

30 min.

Time

SETBACK button

When the night setback mode is selected, the air conditioner automatically
lowers the temperature setting 2 °C when 30 minutes have passed after the
selection was made, and then another 2 °C after another 30 minutes have
passed, regardless of the indoor temperature when night setback was
selected. This enables you to save energy without sacrificing comfort. This
function is convenient when gentle heating is needed.

OI-048-15-EG

Setting
temperature

Press the NIGHT
SETBACK button

30 min.

2°C (4°F)

30 min.

2°C (4°F)

Time

15

6. QUIET Mode

7. HIGH POWER Mode

Operation with the Remote Control Unit (continued)

QUIET Mode is used to reduce the fan sound of the indoor unit.

Press the QUIET button.
The mark appears in the display.

To cancel, press QUIET button again.

• In QUIET Mode, the fan rotates at a slower speed than the fan speed
setting.

• If the unit is already operating with a very low airflow, the fan sound may
not change even if the QUIET button is pressed.

HIGH POWER mode can be used to increase the output of the indoor unit for
all operation modes except automatic operation.

8. ION Mode

Press the HIGH POWER button.
The mark appears in the display.

To cancel, press HIGH POWER button again.

• When the HIGH POWER button is pressed, the unit operates at maximum
output for 30 minutes, regardless of the desired temperature. The fan
speed is 1 step above “High”.

• HIGH POWER Mode cannot be used when the operation mode is
Automatic Operation.

• QUIET Mode and HIGH POWER Mode cannot be used at the same time.

NOTE

• When set to High fan speed during heating operation, the
fan runs at High fan speed even though the mark is
displayed.

• Depending on the operating conditions, the fan speed may
be increased by a small amount only.

The ION mode is used during operation to generate negative ions that
freshen up the air in the room.

Press the ION button.
The mark appears in the display.

To cancel, press ION button again.

16

• The indoor unit’s ION lamp lights up while negative ions are being generated.

• ION “on” is the remote control unit’s initial setting.

• The negative ions are generated from the negative ion generator.

OI-048-16-EG

Special Remarks

‘‘DRY’’ ( ) Operation

How it works? • Once the room temperature reaches the level that was set, the unit’s

operation frequency is changed automatically.

• During DRY operation, the fan speed automatically runs at lower speed for
providing a comfortable breeze.

• ‘‘DRY’’ operation is not possible if the indoor temperature is 15 °C or less.

Heating ( ) Operation

Heating performance • Because this air conditioner heats a room by drawing in the heat of the

outside air (heat pump system), the heating efficiency will fall off when the
outdoor temperature is very low. If sufficient heat cannot be obtained with
this air conditioner, use another heating appliance together with it.

Defrosting • When the outdoor temperature is low, frost or ice may form on the heat

exchanger coil, reducing heating performance. When this happens, a
microcomputer defrosting system operates. At the same time, the fan on
the indoor unit stops and the OPERATION lamp lights red and orange
alternately until defrosting is completed. Heating operation restarts after
several minutes. (This interval will vary slightly depending upon the
outdoor temperature and the way in which frost forms.)

Cold draft prevention • For several minutes after the start of heating operation, the indoor fan runs

at a lower speed until the indoor heat exchanger coil has warmed up
sufficiently. However, the fan may remain stopped when the room
temperature is low. This is because the COLD DRAFT PREVENTION
SYSTEM is in operation.

Cooling ( ) Operation

Power failure during

operation

Clicking Sound

Clicking sound is heard from

the air conditioner

Remote Control Unit

• Sometimes the indoor unit may not get to the set fan speed such as LOW
and QUIET under cool operation at very low outdoor temperatures due to
the indoor unit being protected from ice or frost.

• In the event of power failure, the unit will stop. When the power is
resumed, the unit will restart automatically within 5 minutes or 15 minutes
at M position of the S/M switch on AUTO mode by the remote control unit.

• In heating or cooling operation, any plastic parts may expand or shrink due
to a sudden temperature change. In this event, a clicking sound may occur.
This is normal, and the sound will soon disappear.

• The remote control unit sends the setting condition signals to the air
conditioner regularly at five minute intervals.

OI-048-17-EG

17

Setting the Timer

NOTE

1. How to set the present
time

In the descriptions below, the following settings are used for the temperature
and time indicator selector button on the bottom front section of the remote
control.

• Temperature: °C

• Time: AM, PM

(Example) To set to 10:30 pm.

Operation Indication

1. Press the CLOCK button once if

the time indicator is not flashing.

2. Press the Advance, Return ( ,

) button until PM 10:30 is

displayed.

3. Press the CLOCK button again. This completes the setting of the

The time indication alone flashes.

The time can be set in 1-minute
increments. Holding down the
button advances the time rapidly in
10-minute increments.

current time.

2. How to set the OFF time

18

(Example) To stop the air conditioner at 11:00 am.

1. Press the OFF TIME setting

button once.

The timer indication is
displayed, and the present OFF
time is shown.

2. Press the Advance, Return ( ,

) button until AM 11:00 is

displayed.

The timer indication blinks.
The time can be set in 10-minute
increments. Holding down the
button advances the time rapidly in
10-minute increments.

3. Wait a few seconds, and then

the setting is complete.

The timer indication stops
blinking and the present time is
displayed.

OI-048-18-EG

Setting the Timer (continued)

3. How to set the ON time

4. How to set DAILY ON/OFF
REPEAT timer

(Example) To start operation at 7:10 am.

Operation Indication

1. Press the ON TIME setting

button once.

The timer indication is
displayed, and the present ON time
is shown.

2. Press the Advance, Return ( ,

) button until AM 7:10 is

displayed.

The timer indication blinks.
The time can be set in 10-minute
increments. Holding down the
button advances the time rapidly in
10-minute increments.

3. Wait a few seconds, and then

the setting is complete.

The timer indication stops
blinking and the present time is
displayed.

(Example) To start operation at 7:10 am. and stop the air conditioner at 11:00
am.

10:30 pm.

Present time

7:10 am.

ON

11:00 am.

OFF

1. Set the timer ON/OFF times as

shown in 2-1, 2, 3 and 3-1, 2, 3.

NOTE

• The ON/OFF combination timer uses the current time as
the reference, and it is activated starting from whichever
set time comes first.

• With the ON/OFF combination timer, the settings are
repeated every day.

• You can check the timer ON/OFF times after you have set
them by pressing the ON TIME and OFF TIME setting
buttons.

To cancel a timer program • Press the CANCEL button.

• When either an ON or OFF timer is to be canceled, press the button
corresponding to the timer whose program is to be canceled, and then
press the CANCEL button.

NOTE

• The airflow direction, fan speed and temperature setting can be changed
after a timer program has been set even when the unit is stopped. Even
when operation is stopped during an ON timer program, the unit will start
operating when the set time is reached provided that the program is not
canceled.

• When the ON timer and OFF timer are set to the same time, the timer
operates as if it is turned off.

The present time 10:30 pm. and

are displayed.

OI-048-19-EG

19

Using the 1-Hour OFF Timer

1. 1-Hour OFF Timer This function causes the unit to operate for one hour and then stop,
regardless of whether the unit is on or off when this button is pressed.

The indicator in the display indicates that this function is operating.

Setting procedure:

Regardless of whether the unit is operating or stopped, press the 1 HR.
TIMER button.

appears in the display.

Cancellation procedure:

Press the ON/OFF operation button to turn the unit off, wait for the unit to stop
operating, and then press the ON/OFF operation button again.
The 1-Hour Timer function is now cancelled and the unit operates normally.

NOTE

2. Operation together with the
DAILY ON/OFF REPEAT Timer

Do not • Block the air intake and outlet of the unit. If they are obstructed, the

Do • Always try to keep the air filter clean. (Refer to “Care and Cleaning”.) A

• If, while the 1-Hour Timer function is operating, the 1HR. TIMER button is

pressed once to cancel the function and then again, the unit continues to
operate for one hour from that point in time and then stops.

• It is not possible to use the OFF Timer and 1-Hour OFF Timer together.

Whichever function is set last takes precedence. If the 1 HR. TIMER
button is pressed while the TIMER OFF function operates, the OFF Timer
is cancelled and the unit will stop operating one hour later.

The 1-Hour OFF Timer setting is given priority over the DAILY ON/OFF
REPEAT setting.

Tips for Energy Saving

unit will not work well, and may be damaged.

• Let direct sunlight into the room. Use sunshades, blinds or curtains. If the

walls and ceiling of the room are warmed by the sun, it will take longer to
cool the room.

clogged filter will impair the performance of the unit.

• To prevent conditioned air from escaping, keep windows, doors and any

other openings closed.

20

OI-048-20-EG

Adjusting the Airflow Direction

1. Horizontal The horizontal airflow can be adjusted by moving the vertical vanes with your

hands to the left or right.

CAUTION

2. Vertical The vertical airflow can be adjusted by moving the flap with the remote

A. Sweep function

The flap starts moving up and down to
deliver air over the sweep range.

C. Auto flap function

The flap is set to the recommended
position.

When the humidity is high, the vertical vanes should be in the front
position during the cooling or dehumidifying operation. If the vertical
vanes are positioned all of the way to the right or left, condensation
may begin to form around the air vent and drip down.

control unit. Do not move the flap with your hands. Confirm that the remote
control unit has been turned on. Use the FLAP button to set either the sweep
function or one of the six airflow direction settings.

COOL

DRY

FAN

B. Setting the airflow manually

Referring to the above illustration, use the
FLAP button to set the airflow direction
within the range used during the heating,
cooling, or dehumidifying operation.

SWEEP

SWEEP

HEAT

NOTE

CAUTION

OI-048-21-EG

• The flap automatically closes when the unit is off.

• During the heating operation, the fan speed will be very low and the flap

will be in the horizontal position (position ) until the air being blown out
of the unit begins to warm. Once the air warms up, the flap position and
fan speed change to the settings specified with the remote control.

• Use the FLAP button on the remote control to adjust the position of

the flap. If you move the flap by hand, the flap position according to
the remote control and the actual flap position may no longer match.
If this should happen, shut off the unit, wait for the flap to close, and
then turn on the unit again; the flap position will now be normal
again.

• Do not have the flap pointed down during cooling operation.

Condensation may begin to form around the air vent and drip down.

21

Operation without the Remote
Control Unit

INDOOR UNIT If you have lost the remote control unit or it has trouble, follow the steps

below.

When the air conditioner is not running

Each time the OPERATION button is pressed, the type of operation
conducted is indicated by the changing color of the OPERATION lamp. Press
the button and select the lamp color that suits your preference for operation.

OPERATION button

NOTE

Cooling operation

(green)

The temperature is set to the room temperature minus 2°C during the cooling
operation and to the room temperature plus 2°C during the heating operation,
and the fan speed and flap are set to Auto.

Heating operation

(red)

Stop

(lamp off)

Care and Cleaning

1. For safety, be sure to turn the air conditioner off and also to
disconnect the power before cleaning.

2. Do not pour water on the indoor unit to clean it. This will damage the
internal components and cause an electric shock hazard.

Casing and Grille (Indoor Unit) Clean the casing and grille of the indoor unit with a vacuum cleaner brush, or

wipe them with a clean, soft cloth.

If these parts are stained, use a clean cloth moistened with a mild liquid
detergent. When cleaning the grille, be careful not to force the vanes out of
place.

CAUTION

22

1. Never use solvents, or harsh chemicals when cleaning the indoor
unit. Do not wipe the plastic casing using very hot water.

2. Some metal edges and the fins are sharp and may cause injury if
handled improperly; be especially careful when you clean these
parts.

3. The internal coil and other components of the outdoor unit must be
cleaned every year. Consult your dealer or service center.

OI-048-22-EG

Care and Cleaning (continued)

Anti-Mold Filter The anti-mold filter behind the air intake grille should be checked and cleaned

at least once every two weeks.

How to remove the anti-mold

filter

Cleaning Use a vacuum cleaner to remove light dust. If there is sticky dust on the filter,

How to replace the anti-mold

filter

1. Grasp both ends of the air

Air intake grille

intake grille, and remove it
by opening towards the
front and pulling towards
you.

2. Remove the anti-mold filter
attached to the rear of the

Anti-mold filter

air intake grille.

wash the filter in lukewarm, soapy water, rinse it in clean water, and dry it.

1. With the FRONT mark of
the anti-mold filter at the

Anti-mold filter

front, align the two
indentions near the mark
with the hooks at the rear
of the air intake grille, and
then mount the anti-mold
filter.

FRONT mark

Hook

NOTE

OI-048-23-EG

2. Allow the edge of the air
intake grille to slide into the
top of the indoor unit, and
then insert it all the way
inside.

3. To attach the air intake

Air intake grille

Groove

Pin

Air intake grille

grille to the indoor unit,
press its bottom right and
left corners as well as its
bottom center into place.

Attach so that the round pins at the top right and left corners of the air intake
grille are inserted into the grooves at the top right and left of the indoor unit.

23

Care and Cleaning (continued)

Air Clean Filter The air clean filter removes dust and dirt from the air, and reduces odors and

smoke from tobacco.

This air clean filter cannot remove harmful gases or vapors nor ventilate
air in the room. You must open doors or windows frequently when you
use gas or oil heating appliances. Otherwise there is a risk of
suffocation in extreme cases.

How to install the air clean

filter

The air clean filter needs to be
installed behind the air intake grille.

1. Remove the air intake grille.

2. Install the air clean filter in

the position shown in the
figure.

3. Remount the air intake grille.

Air clean
filter

How to clean the air clean filter • In general, the filter should be sucked to remove dust in low fan speed of a

vacuum cleaner once every three months.

• If there is heavily grime on the filter, soak the filter in lukewarm water with
neutral detergent diluted 1:500 for 1 to 2 minutes then wash it.

• Rinse the filter in clean water, then let it dry on the towel in room temperature.

NOTE

• Do not bend nor give excessive force onto the air clean filter.

• If the filter surface is heavily blocked with dirt or damaged, replace it with new
one. Purchase a replacement filter at your local dealer. (model STK-FDXB)

Cleaning the main unit and

remote control unit

• Wipe clean using a soft, dry cloth.

• To remove stubborn dirt, moisten a cloth in warm water no hotter than
40 °C, wring thoroughly, and then wipe.

• The air intake grille can be removed in order to wash it with water.

Removing and remounting the

air intake grille

Refer to “How to remove the anti-mold filter” and “How to replace the anti­mold filter” on page 23.

When using a footstool or the like, be careful not to let it tip over.

CAUTION

Washing the grille with water • Clean the grille gently using a soft sponge, or the like. Then wipe away any

remaining moisture.

• Neutral detergent may be used to remove stubborn dirt. Then rinse
thoroughly with water and wipe away any remaining moisture.

Cleaning the negative ion

generator

Follow the steps below when the
generator has become dirty.

For safety, be sure to turn the air
conditioner off and also to disconnect
the power before cleaning.

Remove the dust on the negative ion
generator.

• Use a toothbrush, etc. to dust off the end.

NOTE

• Use a cotton swab, etc., to clean around
the generator inside the plastic case,
taking care not to touch the electrodes.

• During use, the negative ion generator and other metal parts may become

Negative ion generator
(metal electrodes inside plastic case)

discolored: this is normal and not indicative of malfunctioning.

• If the dirt on and around the negative ion generator is left to build up, a
puffing or sputtering sound will eventually be heard. In this case, clean the
generator immediately.

• Do not apply excessive force while performing maintenance.

24

OI-048-24-EG

Troubleshooting

If your air conditioner does not work properly, first check the following points before requesting service. If it still does
not work properly, contact your dealer or service center.

Trouble Possible Cause Remedy

Air conditioner does not run at all. 1. Power failure. 1. Restore power.

2. Leakage circuit breaker tripped.

3. Line voltage is too low. 3. Consult your electrician or dealer.

2. Contact service center.

4. Batteries in remote control unit
have run down.

OPERATION lamp blinks and air
conditioner does not operate.

Compressor runs but soon stops. Obstruction in front of condenser coil. Remove obstruction.

Poor cooling (or heating)
performance.

Clicking sound is heard from the air
conditioner.

Trouble in system. Contact service center.

1. Dirty or clogged air filter. 1. Clean air filter to improve airflow.

2. Heat source or many people in
room.

3. Doors and/or windows are open. 3. Shut them to keep the heat (or

4. Obstacle near air intake or air
discharge port.

5. Thermostat is set too high for
cooling (or too low for heating).

6. (Outdoor temperature is too low for
heating.)

In heating or cooling operation, any
plastic parts may expand or shrink
due to a sudden temperature change.
In this event, a clicking sound may
occur.

4. Replace batteries.

2. Eliminate heat source if possible.

cold) out.

4. Remove it to ensure good airflow.

5. Set the temperature lower (or
higher).

6. (Consult your dealer or try to use
another heat appliance.)

This is normal, and the sound will
soon disappear.

OPERATION lamp lights but outdoor
unit will not run.

The use of cellular phones near the
air conditioner may cause
disturbance to its normal operation.

1. Turn off the power then restart the
air conditioner after a while.

2. Consult your dealer.

Operating Range

The air conditioner is operable within the temperature ranges as listed below:

Temperature Indoor air temperature Outdoor air temperature

COOLING Max. 32 °C DB / 23 °C WB 43 °C DB

Min. 19 °C DB / 14 °C WB For Single use –15 °C DB

For Multiple use 19 °C DB

HEATING Max. 27 °C DB 24 °C DB / 18 °C WB

Min. 16 °C DB – DB/ –15 °C WB

OI-048-25-EG

25

INSTALLATION INSTRUCTIONS

MCAF78MR5I
MCAF98MR5I

MCAF128MR5I

MCAF188R5I
MCAF248R5I

(II-852-6-4190-445-00-0)

APPENDIX C

A-3

Model Combinations

Combine indoor and outdoor units only as listed
below.

Indoor Unit Outdoor Unit

MCAF78MR5I GRF148MR5I
MCAF98MR5I GRF198MR5I
MCAF128MR5I GRF248MR5I
MCAF188R5I GRF318MR5I
MCAF248R5I

Power Source:
50 Hz, single-phase, 220 – 240 VAC

Combinations of indoor and outdoor units

Connect indoor and outdoor units only in the
combinations listed in the catalog or installation
manual.

Connecting any other model may result in
operation failure and system damage.

Français

English

85264190445000 12/2007

Contents

Page

IMPORTANT!

Please Read Before Starting .................................. 2

1. GENERAL .......................................................... 3

1-1. Tools Required for Installation (not supplied)
1-2. Accessories Supplied with Unit
1-3. Optional Copper Tubing Kit
1-4. Type of Copper Tube and Insulation Material
1-5. Additional Materials Required for Installation

2. INSTALLATION SITE SELECTION ................... 4

2-1. Indoor Unit
2-2. Embedding the Tubing and Wiring

3. HOW TO INSTALL THE INDOOR UNIT ............. 6

3-1. Remove the Rear Panel from the Unit
3-2. Make a Hole
3-3. Install the Rear Panel on the Wall
3-4. Remove the Grille to Install the Indoor Unit
3-5. Shape the Indoor Side Tubing
3-6. Wiring Instructions
3-7. Wiring Instructions for Inter-unit Connections
3-8. Mounting
3-9. Drain Hose

4. MULTIPLE SWITCH ON THE REMOTE
CONTROL UNIT INDOOR UNIT TYPES

(MCAF188R5I, MCAF248R5I) ...........................15

5. HOW TO TEST RUN THE AIR CONDITIONER ... 16

6. REMOTE CONTROL UNIT INSTALLATION

POSITION ......................................................... 17

6-1. Mounting on a Wall

7. ADDRESS SWITCH.......................................... 18

7-1. Address Setting of the Remote

Control Unit

8. CONNECTING A HOME AUTOMATION

DEVICE.............................................................. 19

9. INSTALLATION CHECK SHEET ...................... 19

COOL/ DRY/ HEAT Model

Be sure to read the yellow instruction sheet
attached to the outdoor unit for models using the
new refrigerant R410A.

The illustrations are based on the typical appearance
of a standard model. Consequently, the shape may
differ from that of the air conditioner that you are
installing.

For Indoor Unit

CAUTION

This air conditioner uses the new refrigerant R410A.

INSTALLATION INSTRUCTIONS

– Multi Split system air conditioner –

NOTE

2

English

IMPORTANT!
Please Read Before Starting

This air conditioning system meets strict safety and oper­ating standards. As the installer or service person, it is an
important part of your job to install or service the system
so it operates safely and efficiently.

For safe installation and trouble-free operation, you
must:

G

Carefully read this instruction booklet before beginning.

G

Follow each installation or repair step exactly as
shown.

G

Observe all local, state, and national electrical codes.

G

Pay close attention to all warning and caution notices
given in this manual.

This symbol refers to a hazard
or unsafe practice which can
result in severe personal injury
or death.

This symbol refers to a hazard
or unsafe practice which can
result in personal injury or prod­uct or property damage.

If Necessary, Get Help

These instructions are all you need for most installation
sites and maintenance conditions. If you require help for a
special problem, contact our sales/service outlet or your
certified dealer for additional instructions.

In Case of Improper Installation

The manufacturer shall in no way be responsible for
improper installation or maintenance service, including
failure to follow the instructions in this document.

SPECIAL PRECAUTIONS

When Wiring

ELECTRICAL SHOCK CAN CAUSE
SEVERE PERSONAL INJURY OR DEATH.
ONLY A QUALIFIED, EXPERIENCED
ELECTRICIAN SHOULD ATTEMPT TO
WIRE THIS SYSTEM.

• Do not supply power to the unit until all wiring and
tubing are completed or reconnected and checked.

• Highly dangerous electrical voltages are used in this
system. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and
inadequate grounding can cause accidental injury or

death.

• Ground the unit following local electrical codes.

• Connect all wiring tightly. Loose wiring may cause over­heating at connection points and a possible fire hazard.

• Install a protective leakage breaker depending on the
installation location (especially a damp or humid loca­tion). If a leakage breaker is not installed, electric
shock can occur.

When Transporting

Be careful when picking up and moving the indoor and out­door units. Get a partner to help, and bend your knees when
lifting to reduce strain on your back. Sharp edges or thin
aluminum fins on the air conditioner can cut your fingers.

When Installing…

…In a Ceiling or Wall

Make sure the ceiling/wall is strong enough to hold the
unit’s weight. It may be necessary to construct a strong
wood or metal frame to provide added support.

…In a Room

Properly insulate any tubing run inside a room to prevent
“sweating” that can cause dripping and water damage to
walls and floors.

…In Moist or Uneven Locations

Use a raised concrete pad or concrete blocks to provide a
solid, level foundation for the outdoor unit. This prevents
water damage and abnormal vibration.

When Connecting Refrigerant Tubing

• Do not add any refrigerant, air, or substance into the
refrigeration circuit other than the designated refrigerant
(R410A). Adding anything other than the specified
refrigerant may cause the pressure to rise excessively
in the refrigeration circuit, rupturing the circuit and
causing injury or damage.

• Use all-new tubing and flare nuts to make the tubing
connections. Using any previous parts (from R22-based
systems) may result in damage to the equipment, and
may lead to the refrigeration circuit rupturing, causing a
serious accident.

• Apply refrigerant lubricant to the matching surfaces of
the flare and union tubes before connecting them, then
tighten the nut with a torque wrench for a leak-free con­nection.

• Check carefully for leaks before starting the test run.

When Servicing

• Turn the power OFF at the main power box (mains)
before opening the unit to check or repair electrical
parts and wiring.

• Keep your fingers and clothing away from any moving
parts.

• Clean up the site after you finish, remembering to
check that no metal scraps or bits of wiring have been
left inside the unit being serviced.

Others

• Ventilate any enclosed areas when installing or testing
the refrigeration system. Escaped refrigerant gas, on
contact with fire or heat, can produce dangerously toxic
gas.

• Confirm upon completing installation that no refrigerant
gas is leaking. If escaped gas comes in contact with a
stove, gas water heater, electric room heater or other
heat source, it can produce dangerously toxic gas.

WARNING

WARNING

CAUTION

CAUTION

3

English

1. General

This booklet briefly outlines where and how to install
the air conditioning system. Please read over the
entire set of instructions for the indoor and outdoor
units and make sure all accessory parts listed are with
the system before beginning.

1-1. Tools Required for Installation (not supplied)

1. Standard screwdriver

2. Phillips head screwdriver

3. Knife or wire stripper

4. Tape measure

5. Carpenter’s level

6. Sabre saw or key hole saw

7. Hacksaw

8. Core bits

9. Hammer

10. Drill

11. Tube cutter

12. Tube flaring tool

13. Torque wrench

14. Adjustable wrench

15. Reamer (for deburring)

1-2. Accessories Supplied with Unit

Table 1

1-3. Optional Copper Tubing Kit

Copper tubing for connecting the outdoor unit to the
indoor unit is available in kits which contain the narrow
and wide tubing, fittings and insulation. Consult your
nearest sales outlet or Air Conditioner workshop.

1-4. Type of Copper Tube and Insulation Material

If you wish to purchase these materials separately
from a local source, you will need:

1. Deoxidized annealed copper tube for refrigerant
tubing as detailed in Table 2.

Cut each tube to the appropriate lengths +30 cm
to 40 cm to dampen vibration between units.

2. Foamed polyethylene insulation for the specified
copper tubes as required to precise length of tub­ing. Wall thickness of the insulation should be not
less than 8 mm.

3. Use insulated copper wire for field wiring. Wire
size varies with the total length of wiring. Refer to
3-6. Wiring Instructions for details.

CAUTION

Check local electrical codes
and regulations before
obtaining wire. Also, check
any specified instructions or
limitations.

Model

Narrow Tube Wide Tube

Outer Dia. Thickness Outer Dia. Thickness

MCAF78 6.35 mm 0.8 mm 9.52 mm 0.8 mm

MCAF98 6.35 mm 0.8 mm 9.52 mm 0.8 mm

MCAF128 6.35 mm 0.8 mm 9.52 mm 0.8 mm

MCAF188 6.35 mm 0.8 mm 12.70 mm 0.8 mm

MCAF248 6.35 mm 0.8 mm 15.88 mm 1.0 mm

Table 2

Parts Figure

Remote
control unit

Remote control
unit holder

AAA alkaline
battery

Q’ty Q’ty Q’ty

1

1

2

Parts Figure

Tapping screw

Tapping screw

Truss-head
Phillips
4 16 mm

Truss-head
Phillips
4 30 mm

2

8

Parts Figure

Air clean filter

Clamp

Packed in the indoor unit.

2

1

4

English

1-5. Additional Materials Required for Installation

1. Refrigeration (armored) tape

2. Insulated staples or clamps for connecting wire
(See local codes)

3. Putty

4. Refrigeration lubricant

5. Clamps or saddles to secure refrigerant tubing

2. Installation Site Selection

2-1. Indoor Unit

AVOID:

G direct sunlight.

G nearby heat sources that may affect performance of the

unit.

G areas where leakage of flammable gas may be expected.

G placing or allowing any obstructions near the Air Condi-

tioner inlet or outlet.

G installing in rooms that contain instant-on (rapid-start)

fluorescent lamps. (These may prevent the Air Conditioner
from receiving signals.)

G places where large amounts of oil mist exist.
G installing in locations where there are devices that

generate high-frequency emissions.

DO:

G select an appropriate position from which every corner of

the room can be uniformly cooled. (High on a wall is best.)

G select a location that will hold the weight of the unit.

G select a location where tubing and drain hose have the

shortest run to the outside. (Fig. 1)

G allow room for operation and maintenance as well as

unrestricted air flow around the unit. (Fig. 2)

G install the unit within the maximum elevation difference

(H1, H2, H3, H4) above or below the outdoor unit and
within a total tubing length (L1+L2, L1+L2+L3,
L1+L2+L3+L4) from the outdoor unit as detailed in Table 3
and Fig. 3a.

Fig. 1

Fig. 2

INDOOR
UNIT (1)

INDOOR
UNIT (4)

INDOOR
UNIT (3)

INDOOR
UNIT (2)

Tubing length (L1)

L2

L3

L4

H2

H3

H4

OUTDOOR
UNIT

Elevation
difference (H1)

Fig. 3a

WARNING

To prevent abnormal heat generation
and the possibility of fire, do not
place obstacles, enclosures and
grilles in front of or surrounding the
air conditioner in a way that may
block air flow.

Indoor unit

Floor level

Wall

Minimum height
from floor level

1.5 m

Fig. 3b

For stable operation of the air
conditioner, do not install
wall-mounted type indoor
units less than 1.5 m from
floor level.

CAUTION

5 cm

min.

Indoor unit

Outside drainage

Front View

15 cm min.

Drain hose

5 cm
min.

5

English

G Install the indoor unit more than 1 meter away from

any antenna or power lines or connecting wires used
for television, radio, telephone, security system, or
intercom. Electrical noise from any of these sources
may affect operation.

G install in a sturdy manner to avoid increased operat-

ing noise.

Table 3

* If total tubing length becomes 45 to 60 m (max.) or 45 to 70 m (max.), charge additional refrigerant (R410A) by 20 g/m.

No additional charge of compressor oil is necessary.

Max. Allowable Max. Allowable Total Limit of Limit of Elevation Required Amount

Tubing Length Tubing Length Total Tubing Length Difference of Additional

Model per unit at shipment (L1+L2) or (L1+L2+L3) (H1, H2, H3, H4) Refrigerant

(m) (L1+L2) or (L1+L2+L3) or (L1+L2+L3+L4) (m) (g/m)*

or (L1+L2+L3+L4) (m)

(m)

GRF148 20 30 (L1+L2) 30 (L1+L2) 15 –

GRF198 25 45 (L1+L2) 45 (L1+L2) 15 –

GRF248 25 45 (L1+L2+L3+L4) 60 (L1+L2+L3+L4) 15 20

GRF318 30 45 (L1+L2+L3+L4) 70 (L1+L2+L3+L4) 15 20

2-2. Embedding the Tubing and Wiring

G Before beginning embedding installation work,

consult fully with agencies or offices related to the
building’s foundation, construction, electricity, and
water.

G Wait to make connections to the embedded portion.

Each connection step is described later in this
manual.

G Securely cover the end of the embedded tubing to

prevent intrusion of dirt or moisture.

G If an embedded tube is to be left for a long time, fill

the tube with nitrogen and seal both ends securely.
If a tube is left open for an extended time, moisture
in the air inside the tubing may condense into water
droplets, and lead to water contamination of the
refrigerant circuit.

G In order to prevent insulation breakdown and ground

faults, do not allow wiring ends to come in contact
with rainwater, or be subjected to condensation or
dew.

G Apply sufficient thermal insulation to the refrigerant

tubing and drain pipes

6

English

Fig. 6

Fig. 7

Fig. 8

3. How to Install the Indoor Unit

3-1. Remove the Rear Panel from the Unit

(1) Remove and discard the set screw on the rear

panel. (Fig. 6)

(2) Press the 2 LL marks on the frame cover and dis-

engage the stationary tabs from the frame. (Fig. 7)

(3) Remove the rear panel.

Tubing can be extended in 5 directions as shown in
Fig. 8. Select the direction you need providing the
shortest run to the outside unit.

G When left tubing is to be done, switch the drain

hose and drain cap. (For details, refer to “Switching
drain hose and drain cap” on page 14.)

3-2. Make a Hole

(1) Place the rear panel from the indoor unit on the

wall at the location selected. Make sure the panel
is horizontal, using a carpenter’s level or tape mea­sure to measure down from the ceiling. Wait until
after cutting the hole before attaching the rear
panel to the wall.

(2) Determine which side of the unit you should make

the hole for tubing and wiring. (Fig. 9a or 9b)

In the case of left-rear tubing, use the measurement
points from the edge of the rear panel for precise
placement of the hose outlet. (Fig. 9a or 9b)

(3) Before making the hole, check carefully that no

studs or pipes are directly run behind the spot to
be cut.

The above precautions are also applicable if tub­ing goes through the wall in any other location.

Fig. 9b

CAUTION

Also avoid areas where elec­trical wiring or conduits are
located.

Fig. 9a

(MCAF78/98/128)

(MCAF188/248)

NOTE

Set screw only for transportation

NOTE

Left
tubing

Left-rear
tubing

Rear panel

marks

Right-rear
tubing
(recommended)

Right tubing

Downward tubing

70 mm

60 mm

7

English

Hole should be made at a slight downward slant to the
outdoor side.

Fig. 10

Fig. 12

Fig. 11

(4) Using a sabre saw, key hole saw or hole-cutting

drill attachment, cut a hole in the wall. See Table 4
and Fig. 10.

Table 4

(5) Measure the thickness of the wall from the inside

edge to the outside edge and cut PVC pipe at a
slight angle 6 mm shorter than the thickness of the
wall. (Fig. 11)

(6) Place the plastic cover over the end of the pipe (for

indoor side only) and insert the pipe in the wall.
(Fig. 12)

3-3. Install the Rear Panel on the Wall

Be sure to confirm that the wall is strong enough to
suspend the unit.

See either Item a) or b) below depending on the wall
type.

a) If Wooden Wall

(1) Attach the rear panel to the wall with the 8 screws

provided. (Fig. 13a or 13b)

If you are not able to line up the holes in the rear
panel with the beam locations marked on the wall,
use rawl plugs or toggle bolts to go through the
holes on the panel or drill 5 mm dia. holes in the
panel over the stud locations and then mount the
rear panel.

(2) Double check with a carpenter’s level or tape mea-

sure that the panel is level. This is important to
install the unit properly. (Fig. 14)

(3) Make sure the panel is flush against the wall. Any

space between the wall and unit will cause noise
and vibration.

b) If Block, Brick, Concrete or Similar Type Wall

Make 4.8 mm dia. holes in the wall. Insert rawl plugs
for appropriate mounting screws. (Fig. 15)

Hole Dia. (mm)

MCAF78/98/128 MCAF188/248

65 80

Fig. 13b

Fig. 14

Fig. 15

Fig. 13a

(MCAF78/98/128)

(MCAF188/248)

NOTE

Indoor
side

Outdoor
side

PVC pipe (Locally purchased)

Cut at slight angle

INSIDE OUTSIDE

Wall

Plastic cover

(Locally purchased)

PVC pipe

Slight
angle

4.8 mm dia. hole

Rawl plug
(Locally purchased)

English

3-4. Remove the Grille to Install the Indoor Unit

3-4-1. Indoor unit types

(MCAF78/98/128)

Basically, these models can be installed and wired without
removing the grille. If access to any internal part is needed,
follow the steps as given below.

How to remove the grille

(1) Grasp both ends of the air intake grille, and remove it

by opening towards the front and pulling towards you.

(Fig. 16a)
(2) Remove the 2 screws. (Fig. 16b)
(3) Remove the screw on the right side cover plate and

open the cover. (Fig. 17a)
(4) Take out the thermistor from the grille. (Fig. 17b)
(5) Pull the lower part of the grille towards you to remove.

(Fig. 18a)
(6) Use a standard screwdriver to push on the tabs to

remove the grille.

How to replace the grille

(1) Reinstall the grille into the lower part while aligning

its tabs on the upper part. (Fig. 18b) Insert the tabs
in the slots and push the lower part of the grille back
into position.

(2) Make sure that the grille and frame are firmly fitted

together by engaging the tabs.
(3) Attach the thermistor on the grille. (Fig. 17a)
(4) Close the cover and replace the screw. (Fig. 17a)
(5) Affix the grille with the 2 previously removed screws.

(Fig. 16b)
(6) Install the air intake grille.

(a) Allow the edge of the air intake grille to slide into

the top of the indoor unit, and then insert it all the
way inside. (Fig. 19a)

(b) Press the bottom right and left corners of the air

intake grille to attach it to the indoor unit. (Fig. 19b)

Attach so that the round pins at the top right and left
corners of the air
intake grille are
inserted into the
grooves at the top
right and left of the
indoor unit.

Fig. 16a

Fig. 16b

Fig. 17a

Fig. 17b

Fig. 18a

Fig. 18b

Fig. 19b

Fig. 19a

CAUTION

Be sure to wear work gloves
during installation to avoid being
cut by the sharp aluminum fins
of the heat exchanger.

8

Screw cover

Thermistor

Air intake grille

Cover

Grille

Thermistor

NOTE

Tab

*

*

Grille

Frame

Ta b

*

*

Grille

Frame

Ta b

Groove

Pin

9

English

3-4-2. Indoor unit types

(MCAF188/248)

Basically, these models can be installed and wired
without removing the grille. If access to any internal
part is needed, follow the steps as given below.

How to remove the grille

(1) Grasp both ends of the air intake grille, and

remove it by opening towards the front and pulling

towards you. (Fig. 16a-1)
(2) Remove the 3 screws. (Fig. 16b-1)
(3) Remove the screw on the right side cover plate

and open the cover. (Fig. 17a-1)
(4) Take out the thermistor from the grille. (Fig. 17b-1)
(5) Press the 3 tabs at the top of the grille and the 3

tabs on the front face to separate the grille from

the frame. (Fig. 18a-1)
(6) Pull the grill towards you to remove it.

How to replace the grille

(1) When installing the grille, place the bottom of the

grille into the frame first. (Fig. 18b-1)
Then insert the tabs on the top of the grille and on
the front face into the frame.

(2) Make sure that the grille and frame are firmly fitted

together by engaging the tabs.
(3) Attach the thermistor on the grille. (Fig. 17a-1)
(4) Close the cover and replace the screw.

(Fig. 17a-1)
(5) Affix the grille with the 3 previously removed

screws. (Fig. 16b-1)
(6) Install the air intake grille.

(a) Allow the edge of the air intake grille to slide

into the top of the indoor unit, and then insert it
all the way inside. (Fig. 19a-1)

(b) Press the bottom right and left corners and

center of the air intake grille to attach it to the
indoor unit. (Fig. 19b-1)

Attach so that the round pins at the top right and left
corners of the air intake grille are inserted into the
grooves at the top right and left of the indoor unit.

Fig. 16a-1

Fig. 16b-1

Fig. 17a-1

Fig. 17b-1

Fig. 18a-1

Fig. 18b-1

Fig. 19b-1

Fig. 19a-1

Pin

Groove

Air intake grille

Grille

Thermistor

Cover

Thermistor

Ta b

NOTE

Ta b

10

English

3-5. Shape the Indoor Side Tubing

(1) Arrangement of tubing by directions

a) Right or left tubing

Cut out the corner of the right/left frame with a
hacksaw or the like. (Figs. 20 and 21)

b) Right-rear or left-rear tubing

In this case, the corner of the frame need not be
cut.

(2) To mount the indoor unit on the rear panel:

Hang the 2 mounting slots of the unit on the
upper tabs of the rear panel. (Fig. 22)

3-6. Wiring Instructions

General precautions on wiring

(1) Before wiring, confirm the rated voltage of the unit

as shown on its nameplate, then carry out the
wiring closely following the wiring diagram.

(2) Provide a power outlet to be used exclusively for

each unit, with a power supply disconnect and cir­cuit breaker for overcurrent protection provided in
the exclusive line.

(3) To prevent possible hazard due to insulation fail-

ure, the unit must be grounded.

(4) Each wiring connection must be done tightly and in

accordance with the wiring system diagram. Wrong
wiring may cause the unit to misoperate or become
damaged.

(5) Do not allow wiring to touch the refrigerant tubing,

compressor, or any moving parts of the fan.

(6) Unauthorized changes in the internal wiring can

be very dangerous. The manufacturer will accept
no responsibility for any damage or misoperation
that occurs as a result of such unauthorized
changes.

Fig. 21

Fig. 22

Fig. 20

Frame

Left tubing
outlet

Frame

Right tubing
outlet

11

English

3-7. Wiring Instructions for Inter-unit Connections

(1) Grasp both ends of the air intake grille, and

remove it by opening towards the front and pulling
towards you.

(2) Remove the screw on the right side cover plate

and open the cover. (Fig. 24)

(3) Insert the inter-unit wiring into the through-the-wall

PVC pipe. Lead the power wiring into the room
allowing approx. 25 cm to extend from the wall
face. (Fig. 25)

(4) Route the inter-unit wiring from the back of the

indoor unit and pull it towards the front for connec­tion. (Fig. 26)

(5) Connect the inter unit wiring to the corresponding

terminals on the terminal plate (Fig. 26) while
referring to the wiring diagram.

(6) Be sure to secure the wiring with the provided

clamp.

When closing the air intake grille, press the bottom
right and left corners and center. (Fig. 27)

Please refer to “How to replace the grille” on page 8 or
9 for installing the air intake grille.

Fig. 25

Fig. 24

Fig. 26

Fig. 27

NOTE

Cover

Rear
panel

Plastic
cover

Wiring

25 cm

12

English

When connecting each power wire to the correspond­ing terminal, follow the instructions “How to connect
wiring to the terminal” and fasten the wire securely
tight with the fixing screw of the terminal plate.

How to connect wiring to the terminal

a) For Indoor Unit

(1) Cut the wire end with a cutting pliers, then strip

the insulation to expose the wire about 7 mm. See
the label (Fig. 28) near the terminal plate.

(2) Using a screwdriver, loosen the terminal screw on

the terminal plate.

(3) Insert the wire and tighten the terminal screw

completely using a screwdriver.

b) For Outdoor Unit

I For solid core wiring (or F-cable)

(1) Cut the wire end with a cutting pliers, then strip

the insulation to expose the solid wire about 25
mm. (Fig. 29)

(2) Using a screwdriver, remove the terminal screw(s)

on the terminal plate.

(3) Using the pliers, bend the solid wire to form a loop

suitable for the terminal screw.

(4) Shape the loop wire properly, place it on the ter-

minal plate and fix it securely with the removed
terminal screw using a screwdriver.

I For stranded wiring

(1) Cut the wire end with a cutting pliers, then strip

the insulation to expose the stranded wiring about
10 mm and tightly twist the wire ends. (Figs. 30
and 31)

(2) Using a screwdriver, remove the terminal screw(s)

on the terminal plate.

(3) Using a ring connector fastener or pliers, securely

clamp each stripped wire end with a ring connec­tor. (Fig. 30)

(4) Place the ring connector wire, and replace and

tighten the removed terminal screw using a screw­driver. (Fig. 32)

Fig. 29

Fig. 28

Fig. 30

Fig. 32

WARNING

Loose wiring may cause the
terminal to overheat or result
in unit malfunction. A fire
hazard may also exist. There­fore, be sure all wiring is
tightly connected.

Fig. 31

STRIP
SIZE

7 mm (ACTUAL

SIZE)

Solid wire

Loop

Strip 25 mm

Insulation

Stranded wire

Ring
connector

Strip 10 mm

Twist wire ends

Wire

Special
washer

Screw

Ring connector

Te r mi nal plate

Wire

Screw and
special washer

Ring
connector

13

English

3-8. Mounting

(1) To install the indoor unit, mount the indoor unit

onto the 2 tabs on the upper part of the rear plate.

(2) Hold down the air discharge outlet and press the

lower part of the indoor unit until it clicks to
securely fasten to the 2 tabs on the lower part of
the rear plate. (Fig. 33)

For tubing, choose either the right or left tubing direc­tion and follow the steps below. This work can be made
easier by placing padding material (such as styrofoam)
at the rear right side of the indoor unit. (Fig. 34)

I Right-side tubing

(1) Shape the refrigerant tubing so that it can easily

go into the wall hole. (Fig. 35)

(2) Push the wiring, refrigerant tubing, and drain hose

through the hole in the wall. Adjust the indoor unit
so it is securely seated on the rear panel. (Fig. 36)

(3) Carefully bend the tubing (if necessary) to run

along the wall in the direction of the outdoor unit
and then tape as far as the fittings. (See Caution
on page 15 in the outdoor unit installation manu­al.) The drain hose should come straight down the
wall to a point where water runoff won’t stain the
wall.

(4) Connect the refrigerant tubing to the outdoor unit.

(After performing a leak test on the connecting
part, insulate it with the tubing insulation. (Fig. 37))
Also, refer to Section 3-6. Tubing connections in
the outdoor unit installation manual.

(5) Assemble the refrigerant tubing, drain hose, and

inter-unit wiring as shown in Fig. 37.

Cover

Refrigerant
tubing

Rear panel

Drain hose

Inter-unit
wiring

Fig. 35

Fig. 36

Fig. 37

Fig. 33

Fig. 34

Insulation

NOTE

Push

Padding material