Toshiba RAS-M10YKV-E, RAS-M10YKCV-E, RAS-M18YAV-E, RAS-M18YACV-E SERVICE MANUAL

SERVICE MANUAL

AIR-CONDITIONER

FILE NO. A00-9906

SUPPLEMENT

SPLIT TYPE

RAS-M10YKV-E, RAS-M13YKV-E

/

RAS-M18YAV-E

R AS-M10YKCV-E, RAS-M13YKCV-E

RAS-M18YACV-E

/

R410A

PRINTED IN JAPAN, Nov.,1999 ToMo

CONTENTS

1. SPECIFICATIONS ...................................................................................... 3

2. REFRIGERANT R410A .............................................................................. 8

3. CONSTRUCTION VIEWS......................................................................... 16

4. WIRING DIA GRAM................................................................................... 18

5. SPECIFICATIONS OF ELECTRICAL PARTS.......................................... 21

6. REFRIGERANT CYCLE DIAGRAM......................................................... 22

7. CONTROL BLOCK DIA GRAM................................................................. 25

8. OPERATION DESCRIPTION ................................................................... 28

9. INSTALLATION PROCEDURE ................................................................ 41

10. HOW T O DIAGNOSE THE TROUBLE ...................................................... 49

11. HOW TO REPLACE THE MAIN PARTS ................................................... 69

12. EXPLODED VIEWS AND PARTS LIST.................................................... 80

– 2 –

1. SPECIFICATIONS

1-1. Specifications

RAS-M10YKV-E, RAS-M13YKV-E / RAS-M18YAV-E

Unit model Indoor
Current limited

Cooling capacity (kW)
Cooling capacity range (kW)
Heating capacity (kW)
Heating capacity range (kW)
Power supply
Electric Indoor Unit model
characteristics

COP (Cooling/Heating)
Operating noise Indoor Unit model

Indoor unit Unit model

Outdoor unit Unit model

Piping connection Type

Refrigerant Name of refrigerant
Wiring connection Power supply
Usable temperature range Indoor (Cooling/Heating) (°C)
Accessory Indoor unit Installation plate

Outdoor

Running current (A)
Power consumption (W)
Power factor (%)

Outdoor Unit model

Operation mode
Running current (A)
Power consumption (W)
Power factor (%)
Starting current (A)

High (dB•A)
Medium (dB•A)
Low (dB•A)

Outdoor Unit model

10-1 indoor unit operating (dB•A)
13-1 indoor unit operating (dB•A)
2 indoor unit operating (dB•A)

Dimension Height (mm)

Width (mm)

Depth (mm)
Net weight (kg)
Fan motor output (W)
Air flow rate (Cooling/Heating) (m3/h)

Dimension Height (mm)

Width (mm)

Depth (mm)
Net weight (kg)
Compressor Motor output (W)

Type

Model
Fan motor output (W)
Air flow rate (m3/h)

Indoor unit Unit model

Liquid side

Gas side
Outdoor unit Unit model

A unit liquid side/gas side

B unit liquid side/gas side
Maximum length (per unit) (m)
Maximum length (total) (m)
Maximum chargeless length (m)
Maximum height difference (m)

Weight (kg)

Interconnection

Outdoor (Cooling/Heating) (°C)

Wireless remote control

Label

Remote control holder

Pan head wood screw

Purifying filter

Deodorizing filter

Batteries

Mounting screw

Installation manual
Outdoor unit Installation manual

Owner's manual

RAS-M10YKV-E (Cooling / Heating) RAS-M13YKV-E (Cooling / Heating)

Twin rotar y type with DC-inverter variable speed control

• For performance when each indoor unit is combined with other unit, ref er to the separate table .

• The specifications may be subject to change without notice f or purpose of improv ement.

RAS-M10YKV-E, RAS-M13YKV-E

RAS-M18YAV-E

—

5,2

1,4 – 6,2

6,7

0,9 – 8,7

220 – 230 – 240V – 1Ph – 50 Hz

RAS-M10YKV-E RAS-M13YKV-E

0,15 0,15

30 30
87 87

RAS-M18YAV-E

Cooling Heating

7,90 / 7,57 / 7,28 8,55 / 8,17 / 7,81

1660 1790

95% 95%

9,86 / 9,43 / 9,04

3,02 / 3,62

36 / 39 39 / 40
33 / 35 35 / 35
30 / 30 30 / 30

RAS-M18YAV-E (Cooling / Heating)

42 / 45
46 / 49
46 / 49

RAS-M10YKV-E RAS-M13YKV-E

265 265
790 790
189 189

88

19 19

470 / 520 520 / 560

RAS-M18YAV-E

550
780
270

44

1100

DA130A1F-21F

40

2060

Flare connection

RAS-M10YKV-E RAS-M13YKV-E

Ø6,35 Ø6,35
Ø9,52 Ø9,52

RAS-M18YAV-E

Ø6,35 / Ø9,52
Ø6,35 / Ø9,52

20
30
30
10

R410A

1,15
3 Wires : includes earth
4 Wires : includes earth

21 – 32 / 0 – 28

21 – 43 / –5 – 21

1
1
2
1

2 (Ø3,1 x 16L)

1
1
2

6 (Ø4 x 25L)

1
1
1

– 3 –

RAS-M10YKCV-E, RAS-M13YKCV-E / RAS-M18YACV-E

Unit model Indoor
Cooling capacity (kW)

Cooling capacity range (kW)
Power supply
Electric Indoor Unit model

characteristics

COP
Operating noise Indoor Unit model

Indoor unit Unit model

Outdoor unit Unit model

Piping connection Type

Refrigerant Name of refrigerant
Wiring connection Power supply
Usable temperature range Indoor (°C)
Accessory Indoor unit Installation plate

Outdoor

Running current (A)
Power consumption (W)
Power factor (%)

Outdoor Unit model

Running current (A)
Power consumption (W)
Power factor (%)
Starting current (A)

High (dB•A)
Medium (dB•A)
Low (dB•A)

Outdoor Unit model

10-1 indoor unit operating (dB•A)
13-1 indoor unit operating (dB•A)
2 indoor unit operating (dB•A)

Dimension Height (mm)

Width (mm)

Depth (mm)
Net weight (kg)
Fan motor output (W)
Air flow rate (m3/h)

Dimension Height (mm)

Width (mm)

Depth (mm)
Net weight (kg)
Compressor Motor output (W)

Type

Model
Fan motor output (W)
Air flow rate (m3/h)

Indoor unit Unit model

Liquid side

Gas side
Outdoor unit Unit model

A unit liquid side/gas side

B unit liquid side/gas side
Maximum length (per unit) (m)
Maximum length (total) (m)
Maximum chargeless length (m)
Maximum height difference (m)

Weight (kg)

Interconnection

Outdoor (°C)

Wireless remote control

Label

Remote control holder

Pan head wood screw

Purifying filter

Deodorizing filter

Batteries

Mounting screw

Installation manual
Outdoor unit Installation manual

Owner's manual

RAS-M10YKCV-E, RAS-M13YKCV-E

RAS-M18YACV-E

5,2

1,4 – 6,2

220 – 230 – 240V – 1Ph – 50 Hz

RAS-M10YKCV-E RAS-M13YKCV-E

0,15 0,15

30 30
87 87

RAS-M18YACV-E

7,90 / 7,57 / 7,28

1660

95%

8,20 / 7,87 / 7,58

3,02

RAS-M10YKCV-E RAS-M13YKCV-E

36 39
33 35
30 30

RAS-M18YACV-E

42
46
46

RAS-M10YKCV-E RAS-M13YKCV-E

265 265
790 790
189 189

88

19 19

470 520

RAS-M18YACV-E

550
780
270

42

1100

Twin rotar y type with DC-inverter variable speed control

DA130A1F-21F

40

2060

Flare connection

RAS-M10YKCV-E RAS-M13YKCV-E

Ø6,35 Ø6,35
Ø9,52 Ø9,52

RAS-M18YACV-E

Ø6,35 / Ø9,52
Ø6,35 / Ø9,52

20
30
30
10

R410A

1,15
3 Wires : includes earth
4 Wires : includes earth

21 – 32
21 – 43

1
1
2
1

2 (Ø3,1 x 16L)

1
1
2

6 (Ø4 x 25L)

1
1
1

• For performance when each indoor unit is combined with other unit, ref er to the separate table .

• The specifications may be subject to change without notice f or purpose of improv ement.

– 4 –

1-2. Specifications of Performance When Each Indoor Unit is Combined with Other Unit

<Cooling>

Volts

V

220

230

240

Operation

status

1 unit

2 units

1 unit

2 units

1 unit

2 units

Operating Unit capacity Cooling Running Power Outdoor

indoor unit (kW) capacity current consumption

ABAB kW A W dB

10 — 2,7 — 2,7 4,13 770 42
13 — 3,7 — 3,7 6,58 1240 46
10 10 2,55 2,55 5,1 8,14 1700 46
13 10 3,01 2,19 5,2 8,20 1720 46
10 — 2,7 — 2,7 3,95 770 42
13 — 3,7 — 3,7 6,30 1240 46
10 10 2,55 2,55 5,1 7,78 1700 46
13 10 3,01 2,19 5,2 7,87 1720 46
10 — 2,7 — 2,7 3,79 770 42
13 — 3,7 — 3,7 6,03 1240 46
10 10 2,55 2,55 5,1 7,46 1700 46
13 10 3,01 2,19 5,2 7,58 1720 46

(1,1 to 3,2) (1,65 to 4,99) (255 to 930)
(1,1 to 4,2) (1,65 to 7,25) (255 to 1430)
(1,4 to 6,1) (1,68 to 10,29) (260 to 2150)
(1,4 to 6,2) (1,68 to 10,38) (260 to 2170)
(1,1 to 3,2) (1,59 to 4,78) (255 to 930)
(1,1 to 4,2) (1,59 to 6,94) (255 to 1430)
(1,4 to 6,1) (1,62 to 9,84) (260 to 2150)
(1,4 to 6.2) (1,62 to 9,93) (260 to 2170)
(1,1 to 3,2) (1,52 to 4,58) (255 to 930)
(1,1 to 4,2) (1,52 to 6,65) (255 to 1430)
(1,4 to 6,1) (1,55 to 9,43) (260 to 2150)
(1,4 to 6,2) (1,55 to 9,52) (260 to 2170)

operating noise

<Heating>

Volts

Operation

V

220

230

240

status

1 unit

2 units

1 unit

2 units

1 unit

2 units

Operating Unit capacity Heating Running Power Outdoor

indoor unit (kW) capacity current consumption

ABAB kW A W dB

10 — 4,0 — 4,0 6,94 1450 45
13 — 5,0 — 5,0 9,86 2060 49
10 10 3,2 3,2 6,4 8,47 1770 49
13 10 3,72 2,98 6,7 8,85 1850 49
10 — 4,0 — 4,0 6,64 1450 45
13 — 5,0 — 5,0 9,43 2060 49
10 10 3,2 3,2 6,4 8,10 1770 49
13 10 3,72 2,98 6,7 8,47 1850 49
10 — 4,0 — 4,0 6,36 1450 45
13 — 5,0 — 5,0 9,04 2060 49
10 10 3,2 3,2 6,4 7,76 1770 49
13 10 3,72 2,98 6,7 8,11 1850 49

(0,7 to 5,2) (1,10 to 8,13) (170 to 1700)
(0,7 to 6,5) (1,10 to 12,11) (170 to 2530)
(0,9 to 8,3) (1,10 to 11,43) (170 to 2390)
(0,9 to 8,7) (1,10 to 11,72) (170 to 2450)
(0,7 to 5,2) (1,06 to 7,78) (170 to 1700)
(0,7 to 6,5) (1,06 to 11,58) (170 to 2530)
(0,9 to 8,3) (1,06 to 10,94) (170 to 2390)
(0,9 to 8,7) (1,06 to 11,21) (170 to 2450)
(0,7 to 5,2) (1,01 to 7,46) (170 to 1700)
(0,7 to 6,5) (1,01 to 11,10) (170 to 2530)
(0,9 to 8,3) (1,01 to 10,48) (170 to 2390)
(0,9 to 8,7) (1,01 to 10,75) (170 to 2450)

operating noise

• The above specification values are those under the conditions
Cooling indoor : DB/WB=27/19°C Cooling outdoor : DB=35°C

Heating indoor : DB=20°C Heating outdoor : DB/WB=7/6°C

– 5 –

1-2-1. Operation Characteristic Curve

<Cooling> <Heating>

10

9

8

7

6

5

Current (A)

4

3

• Conditions
Indoor : DB 27˚C/WB 19˚C

2

1

Outdoor : DB 35˚C
Air flow : High
Pipe length : 5m x 2
2 units operating
230V

0

10

0 20 30 40 50 60 70 80 90 100 0 20 40 60 80 100 120 140

12

10

8

6

Current (A)

4

2

0

• Conditions
Indoor : DB 20˚C
Outdoor : DB 7˚C/WB 6˚C
Air flow : High
Pipe length : 5m x 2
2 units operating
230V

Compressor speed (rps) Compressor speed (rps)

1-2-2. Cooling Capacity Variation Ratio According to Temperature

105115

• Conditions
Indoor : DB27˚C

110

Outdoor : DB35˚C
Indoor air flow : High
Pipe length 5m×2

105

2 units operating

100

95

Capacity ratio (%)

90

85

0

100

95
90
85
80
75
70

Capacity ratio (%)

65
60
55
50

32 34

Current Limited Start

• Conditions
Indoor : DB27˚C/WB19˚C
Indoor air flow : High
Pipe length 5m×2
2 units operating

36 38 40 4233 35 37 39 41 4314 16 18 20 22 24

– 6 –

Outdoor temp. (˚C)Indoor air wet bulb temp. (˚C)

* Capacity ratio : 100% = 5,2 kW

1-3. Electrical Data

<Cooling>

Combination

of indoor unit

operation

AB

10 —
13 —
10 10
13 10

<Heating>

Combination

of indoor unit

operation

AB

10 —

System

Voltage range Power supply

Volts-

Hz

50 230–1 198 264

Hz

Ph.

Volts-

Ph.

Min. Max. MCA ICF

System

Voltage range Power supply

Min. Max. MCA ICF

MOCP

(Amps)

5,81 5,81 15
8,51 8,51 15
12,10 12,10 15
12,21 12,21 15

MOCP

(Amps)

9,56 9,56 15

Compressor Fan motor FLA

MSC RLA Indoor Outdoor

4,13 4,13 0,15 x 1=0,15 0,50
6,29 6,29 0,15 x 1=0,15 0,50
9,04 9,04 0,15 x 2=0,30 0,50
9,13 9,13 0,15 x 2=0,30 0,50

Compressor Fan motor FLA

MSC RLA Indoor Outdoor

7,13 7,13 0,15 x 1=0,15 0,50

13 —

50 230–1 198 264

10 10
13 10

14,31 14,31 15
13,47 13,47 15
13,81 13,81 15

NOTE :

Model of Indoor unit :

10 : RAS-M10YKV-E, RAS-M10YKCV-E

13 : RAS-M13YKV-E, RAS-M13YKCV-E
MCA : Minimum Circuit Amps.
ICF : Maximum Instantaneous Current Flow

(Equivalent to MCA in case of inv erter air conditioner)
MOCP : Maximum Overcurrent Protection (Fuse only)
MSC : Maximum Starting Current
FLA : Full Load Amps.
RLA : Rated Load Amps. RLA under conditions on the right.

10,93 10,93 0,15 x 1=0,15 0,50
10,14 10,14 0,15 x 2=0,30 0,50
10,41 10,41 0,15 x 2=0,30 0,50

<Cooling>

DB WB

Indoor temp. °C 27 19
Outdoor temp. °C 35 —

<Heating>

DB WB

Indoor temp. °C 20 —
Outdoor temp. °C 7 6

– 7 –

2. REFRIGERANT R410A

This air conditioner adopts the new refrigerant HFC
(R410A) which does not damage the ozone lay er.

The working pressure of the new refrigerant R410A
is 1,6 times higher than conventional refrigerant
(R22). The refrigerating oil is also changed in
accordance with change of refrigerant, so be careful
that water , dust, and e xisting refrigerant or refrigerat­ing oil are not entered in the refrigerant cycle of the
air conditioner using the new refrigerant during
installation work or servicing time.

The next section describes the precautions for air
conditioner using the new refrigerant. Conf orming to
contents of the next section together with the
general cautions included in this manual, perform
the correct and safe work.

2-1. Safety During Installation/Servicing

As R410A’s pressure is about 1,6 times higher than
that of R22, improper installation/servicing may
cause a serious trouble. By using tools and materi­als exclusive for R410A, it is necessary to carry out
installation/servicing safely while taking the following
precautions into consideration.

(1) Never use refrigerant other than R410A in an air

conditioner which is designed to operate with
R410A.

If other refrigerant than R410A is mixed, pres­sure in the refrigeration cycle becomes abnor­mally high, and it may cause personal injury, etc.
by a rupture.

(2) Confirm the used refrigerant name, and use

tools and materials exclusive f or the refrigerant
R410A.

The refrigerant name R410A is indicated on the
visible place of the outdoor unit of the air condi­tioner using R410A as refrigerant. To prevent
mischarging, the diameter of the service port
differs from that of R22.

(3) If a refrigeration gas leakage occurs during

installation/servicing, be sure to ventilate fully .
If the refrigerant gas comes into contact with fire,

a poisonous gas may occur .

(4) When installing or removing an air conditioner,

do not allow air or moisture to remain in the
refrigeration cycle. Otherwise , pressure in the
refrigeration cycle may become abnormally high
so that a rupture or personal injury may be
caused.

(5) After completion of installation work, check to

make sure that there is no refrigeration gas
leakage.

If the refrigerant gas leaks into the room, coming
into contact with fire in the fan-driven heater,
space heater, etc., a poisonous gas may occur.

(6) When an air conditioning system charged with a

large volume of refrigerant is installed in a small
room, it is necessary to exercise care so that,
even when refrigerant leaks , its concentration
does not exceed the marginal lev el.

If the refrigerant gas leakage occurs and its
concentration exceeds the marginal le v el, an
oxygen starvation accident may result.

(7) Be sure to carry out installation or removal

according to the installation manual.
Improper installation may cause refrigeration

trouble, water leakage , electric shock, fire, etc.

(8) Unauthorized modifications to the air conditioner

may be dangerous. If a breakdown occurs
please call a qualified air conditioner technician
or electrician.

Improper repair’s ma y result in water leakage ,
electric shock and fire, etc.

2-2. Refrigerant Piping Installation

2-2-1. Piping Materials and Joints Used

For the refrigerant piping installation, copper pipes
and joints are mainly used. Copper pipes and joints
suitable for the refrigerant must be chosen and
installed. Furthermore, it is necessary to use clean
copper pipes and joints whose interior surfaces are
less affected by contaminants.

(1) Copper Pipes

It is necessary to use seamless copper pipes
which are made of either copper or copper alloy
and it is desirable that the amount of residual oil
is less than 40 mg/10 m. Do not use copper
pipes having a collapsed, deformed or discol­ored portion (especially on the interior surface).
Otherwise, the expansion v alv e or capillary tube
may become bloc ked with contaminants.

As an air conditioner using R410A incurs
pressure higher than when using R22, it is
necessary to choose adequate materials.

Thicknesses of copper pipes used with R410A
are as shown in Table 2-2-1. Never use copper
pipes thinner than 0,8 mm even when it is
availab le on the market.

– 8 –

T a ble 2-2-1 Thicknesses of annealed copper pipes

Thickness (mm)

Nominal diameter Outer diameter (mm) R410A R22

1/4 6,35 0,80 0,80
3/8 9,52 0,80 0,80
1/2 12,70 0,80 0,80
5/8 15,88 1,00 1,00

(2) Joints

For copper pipes, flare joints or soc ket joints are
used. Prior to use, be sure to remove all con­taminants.

a) Flare Joints

Flare joints used to connect the copper pipes
cannot be used for pipings whose outer
diameter exceeds 20 mm. In such a case,
socket joints can be used.

Sizes of flare pipe ends, flare joint ends and
flare nuts are as shown in T ables 2-2-3 ~ 2-2­6 below.

Table 2-2-2 Minimum thicknesses of socket joints

Nominal diameter

1/4 6,35 0,50
3/8 9,52 0,60
1/2 12,70 0,70

Reference outer diameter of Minimum joint thickness

copper pipe jointed (mm) (mm)

b) Socket Joints

Socket joints are such that the y are braz ed
for connections, and used mainly f or thic k
pipings whose diameter is larger than 20 mm.
Thicknesses of sock et joints are as shown in
T ab le 2-2-2.

5/8 15,88 0,80

2-2-2. Processing of Piping Materials

When performing the refrigerant piping installation,
care should be taken to ensure that water or dust
does not enter the pipe interior, that no other oil
other than lubricating oils used in the installed air
conditioner is used, and that refrigerant does not
leak. When using lubricating oils in the piping
processing, use such lubricating oils whose water
content has been removed. When stored, be sure to
seal the container with an airtight cap or any other
cover .

(1) Flare Processing Procedures and Precautions

a) Cutting the Pipe

By means of a pipe cutter, slo wly cut the pipe
so that it is not deformed.

b) Removing Burrs and Chips

If the flared section has chips or burrs,
refrigerant leakage may occur. Carefully
remove all b urrs and clean the cut surface
before installation.

– 9 –

c) Insertion of Flare Nut
d) Flare Processing

Make certain that a clamp bar and copper
pipe have been cleaned.

By means of the clamp bar, perform the flare
processing correctly.

Use either a flare tool for R410A or conven­tional flare tool.

Table 2-2-3 Dimensions related to flare processing for R410A

Flare processing dimensions differ according
to the type of flare tool. When using a con­ventional flare tool, be sure to secure “dimen­sion A” by using a gauge for size adjustment.

ØD

A

Fig. 2-2-1 Flare processing dimensions

Nominal

diameter

Outer

diameter

(mm)

1/4 6,35 0,8
3/8 9,52 0,8
1/2 12,70 0,8
5/8 15,88 1,0

T a ble 2-2-4 Dimensions related to flare processing for R22

Nominal

diameter

Outer

diameter

(mm)

1/4 6,35 0, 8
3/8 9,52 0, 8
1/2 12,70 0,8

Thickness

(mm)

Thickness

(mm)

A (mm)

Flare tool for

R410A clutch type

Conventional flare tool

Clutch type Wing nut type

0 to 0,5 1,0 to 1,5 1,5 to 2,0
0 to 0,5 1,0 to 1,5 1,5 to 2,0
0 to 0,5 1,0 to 1,5 2,0 to 2,5
0 to 0,5 1,0 to 1,5 2,0 to 2,5

A (mm)

Flare tool for

R22 clutch type

Conventional flare tool

Clutch type Wing nut type

0 to 0,5 0,5 to 1,0 1,0 to 1,5
0 to 0,5 0,5 to 1,0 1,0 to 1,5
0 to 0,5 0,5 to 1,0 1,5 to 2,0

5/8 15,88 1,0

Table 2-2-5 Flare and flare nut dimensions for R410A

Nominal Outer diameter Thickness

diameter (mm) (mm)

1/4 6,35 0, 8
3/8 9,52 0, 8
1/2 12,70 0,8
5/8 15,88 1,0

0 to 0,5 0,5 to 1,0 1,5 to 2,0

Dimension (mm)

Flare nut

width

ABCD

(mm)

9,1 9,2 6,5 13 17
13,2 13,5 9,7 20 22
16,6 16,0 12,9 23 26
19,7 19,0 16,0 25 29

– 10 –

Table 2-2-6 Flare and flare nut dimensions for R22

Nominal Outer diameter Thickness

diameter (mm) (mm)

1/4 6,35 0,8
3/8 9,52 0,8
1/2 12,70 0,8
5/8 15,88 1,0
3/4 19,05 1,0

46˚

~

45˚

B A

Dimension (mm)

Flare nut

width

ABCD

(mm)

9,0 9,2 6,5 13 17
13,0 13,5 9,7 20 22
16,2 16,0 12,9 20 24
19,4 19,0 16,0 23 27
23,3 24,0 19,2 34 36

D

C

43˚

~

45˚

Fig. 2-2-2 Relations between flare nut and flare seal surface

(2) Flare Connecting Procedures and Precautions

a) Make sure that the flare and union portions

do not have any scar or dust, etc.

b) Correctly align the processed flare surface

with the union axis.

c) Tighten the flare with designated torque by

means of a torque wrench. The tightening
torque for R410A is the same as that for
conventional R22. Incidentally, when the
torque is weak, the gas leakage may occur .

T a ble 2-2-7 Tightening torque of flare for R410A [Reference values]

Nominal Outer diameter Tightening torque

diameter (mm) N•m (kgf•cm)

1/4 6,35 14 to 18 (140 to 180) 16 (160), 18 (180)

When it is strong, the flare nut may cra c k and
may be made non-remov abl e. When choos­ing the tightening torque, comply with values
designated by manufacturers . Table 2-2-7
shows reference values.

Note:

When applying oil to the flare surface, be sure to use
oil designated by the manufacturer. If any other oil is
used, the lubricating oils may deteriorate and cause
the compressor to burn out.

Tightening torque of torque

wrenches available on the market

N•m (kgf•cm)

3/8 9,52 33 to 42 (330 to 420) 42 (420)
1/2 12,70 50 to 62 (500 to 620) 55 (550)
5/8 15,88 63 to 77 (630 to 770) 65 (650)

– 11 –

2-3. Tools

2-3-1. Required Tools

The service port diameter of packed v alve of the outdoor unit in the air conditioner using R410A is changed to pre vent
mixing of other refrigerant. To reinforce the pressure-resisting strength, flare processing dimensions and opposite side
dimension of flare nut (For Ø12,7 copper pipe) of the refrigerant piping are lengthened.

The used refrigerating oil is changed, and mixing of oil may cause a trouble such as generation of sludge ,
clogging of capillary, etc. Accordingly, the tools to be used are classified into the f ollo wing three types.

(1) Tools exclusive f or R410A (Those which cannot be used f or conventional refrigerant (R22))
(2) Tools exclusive f or R410A, b ut can be also used for conventional refrigerant (R22)
(3) Tools commonly used for R410A and for con v entional refrigerant (R22)

The table below shows the tools e xclusiv e for R410A and their interchangeability .

Tools exclusive for R410A (The following tools for R410A are required.)

Tools whose specifications are changed for R410A and their interchangeability

R410A air conditioner

installation

No. Used tool

 Flare tool

Copper pipe gauge for

 adjusting projection

margin
Torque wrench



(For Ø12,7)

 Gauge manifold
 Charge hose

 Vacuum pump adapter

Electronic balance for



refrigerant charging

 Refrigerant cylinder
 Leakage detector
 Charging cylinder

(Note 1) When flaring is carried out for R410A using the conv entional flare tools , adjustment of projection

margin is necessary . For this adjustment, a copper pipe gauge, etc. are necessary.

(Note 2) Charging cylinder for R410A is being currently developed.

Usage

Pipe flaring
Flaring by

conventional flare
tool

Connection of flare
nut

Evacuating, refriger­ant charge, run
check, etc.

Vacuum evacuating
Refrigerant charge

Refrigerant charge
Gas leakage check
Refrigerant charge

Existence of Whether
new equipment conventional
for R410A equipment can

Yes

Yes

Yes

Yes

Yes
Yes
Yes

Yes

(Note 2)

be used

(Note 1)

*

(Note 1)

*

X
X

X
X

X
X
X

Conventional air

conditioner installation

Whether new equip­ment can be used with
conventional refriger­ant

¡

(Note 1)

*

X
X

¡
¡

X

¡

X

General tools (Conventional tools can be used.)

In addition to the above e xclusive tools, the following equipments which serve also for R22 are necessary
as the general tools.

(1) Vacuum pump

Use vacuum pump by

attaching vacuum pump adapter.
(2) Torque wrench (For Ø6,35)
(3) Pipe cutter

Also prepare the following equipments f or other installation method and run check.

(1) Clamp meter
(2) Thermometer

(4) Reamer
(5) Pipe bender
(6) Level vial
(7) Screwdriver (+, –)
(8) Spanner or Monkey wrench

(3) Insulation resistance tester
(4) Electroscope

(9) Hole core drill (Ø65)
(10) Hexagon wrench

(Opposite side 5mm)

(11) Tape measure
(12) Metal saw

– 12 –

2-4. Recharging of Refrigerant

When it is necessary to recharge refrigerant, charge the specified amount of new refrigerant according to the
following steps.

Recover the refrigerant, and check no refrigerant
remains in the equipment.

Connect the charge hose to packed valve service
port at the outdoor unit’s gas side.

When the compound gauge’s pointer has indicated
–0,1 Mpa (–76 cmHg), place the handle Low in the
fully closed position, and turn off the vacuum pump’s
power switch.

Connect the charge hose of the vacuum pump
adapter.

Open fully both packed valves at liquid and gas
sides.

Place the handle of the gauge manifold Low in the
fully opened position, and turn on the vacuum pump’s
power switch. Then, evacuating the refrigerant in the
cycle.

Never charge refrigerant e xceeding the specified amount.



If the specified amount of refrigerant cannot be charged, charge refrigerant bit by bit in COOL mode.



Do not carry out additional charging.



Keep the status as it is for 1 to 2 minutes, and ensure
that the compound gauge’s pointer does not return.

Set the refrigerant cylinder to the electronic balance,
connect the connecting hose to the cylinder and the
connecting port of the electronic balance, and charge
liquid refrigerant.

(For refrigerant charging, see the figure below.)

When additional charging is carried out if refrigerant leaks, the refrigerant composition changes in the
refrigeration cycle, that is characteristics of the air conditioner changes, refrigerant exceeding the
specified amount is charged, and working pressure in the refrigeration cycle becomes abnormally
high pressure, and may cause a rupture or personal injury.

(INDOOR unit)

Refrigerant cylinder

(With siphon pipe)

Check valve

Open/Close valve

for charging

Electronic balance for refrigerant charging

Fig. 2-4-1 Configuration of refrigerant charging

(Liquid side)

(Gas side)

– 13 –

(OUTDOOR unit)

Opened

Closed

Service port

Be sure to make setting so that liquid can be charged.



When using a cylinder equipped with a siphon, liquid can be charged without turning it upside down.



It is necessary for charging refrigerant under condition of liquid because R410A is mixed type of refrigerant.
Accordingly, when charging refrigerant from the refrigerant cylinder to the equipment, charge it turning the
cylinder upside down if cylinder is not equipped with siphon.

[ Cylinder with siphon ] [ Cylinder without siphon ]

Gauge manifold

OUTDOOR unit

Refrigerant

cylinder

Gauge manifold

OUTDOOR unit

cylinder

Refrigerant

Electronic

balance

R410A refrigerant is HFC mixed refrigerant.
Therefore, if it is charged with gas, the compo­sition of the charged refrigerant changes and
the characteristics of the equipment varies.

2-5. Brazing of Pipes

2-5-1. Materials for Brazing

(1) Silver brazing filler

Silver brazing filler is an alloy mainly composed
of silver and copper . It is used to join iron,
copper or copper alloy, and is relatively expen­sive though it excels in solderability.

(2) Phosphor bronze brazing filler

Phosphor bronze brazing filler is generally used
to join copper or copper alloy.

(3) Low temperature brazing filler

Low temperature brazing filler is generally called
solder, and is an alloy of tin and lead. Since it is
weak in adhesive strength, do not use it for
refrigerant pipes.

Fig. 2-4-2

Electronic

balance

Siphon

Phosphor bronze brazing filler tends to react



with sulfur and produce a fragile compound
water solution, which may cause a gas leak­age. Therefore, use any other type of brazing
filler at a hot spring resort, etc., and coat the
surface with a paint.

When performing brazing again at time of



servicing, use the same type of brazing filler.

2-5-2. Flux

(1) Reason why flux is necessary

• By removing the oxide film and any foreign
matter on the metal surface, it assists the flo w
of brazing filler .

• In the brazing process, it prevents the metal
surface from being o xidized.

• By reducing the brazing filler’s surface tension,
the brazing filler adheres better to the treated
metal.

– 14 –

(2) Characteristics required for flux

• Activated temperature of flux coincides with
the brazing temperature.

• Due to a wide effective temper ature range,
flux is hard to carbonize.

• It is easy to remove slag after brazing.

• The corrosive action to the treated metal and
brazing filler is minimum.

• It excels in coating performance and is
harmless to the human body .

As the flux works in a complicated manner as
described above, it is necessary to select an
adequate type of flux according to the type and
shape of treated metal, type of brazing filler and
brazing method, etc.

(3) Types of flux

• Noncorrosive flux

Generally, it is a compound of borax and boric
acid.
It is effective in case where the br azing
temperature is higher than 800°C.

• Activated flux

Most of fluxes generally used f or silv er br azing
are this type.
It features an increased oxide film remo ving
capability due to the addition of compounds
such as potassium fluoride, potassium chlo­ride and sodium fluoride to the borax-boric
acid compound.

(4) Piping materials for brazing and used braz-

ing filler/flux

2-5-3. Brazing

As brazing work requires sophisticated techniques,
experiences based upon a theoretical knowledge, it
must be performed by a person qualified.

In order to prev ent the o xide film from occurring in
the pipe interior during brazing, it is effective to
proceed with brazing while letting dry Nitrogen gas
(N2) flow .

Never use gas other than Nitrogen gas.

(1) Brazing method to prevent oxidation

Attach a reducing valve and a flow-meter to



the Nitrogen gas cylinder.
Use a copper pipe to direct the piping



material, and attach a flow-meter to the
cylinder.

Apply a seal onto the clearance between the



piping material and inserted copper pipe for
Nitrogen in order to prevent bac kflo w of the
Nitrogen gas.

When the Nitrogen gas is flowing, be sure to



keep the piping end open.
Adjust the flow rate of Nitrogen gas so that it



is lower than 0,05 m3/Hr or 0,02 MPa (0,2kgf/
cm2) by means of the reducing valve .

After performing the steps above , keep the



Nitrogen gas flowing until the pipe cools
down to a certain extent (temperature at
which pipes are touchable with hands).

Remove the flux completely after brazing.



Piping

material

Copper - Copper

Copper - Iron

Iron - Iron

Do not enter flux into the refrigeration cycle.



When chlorine contained in the flux remains



within the pipe, the lubricating oil deterio­rates. Therefore, use a flux which does not
contain chlorine.

When adding water to the flux, use water



which does not contain chlorine (e.g. distilled
water or ion-exchange w ater).

Remove the flux after brazing.



Used brazing Used

filler flux

Phosphor copper Do not use

Silver Paste flux
Silver Vapor flux

M

Flow meter

Stop valve

Nitrogen gas

cylinder

From Nitrogen cylinder

Pipe

Rubber plug

Fig. 2-5-1 Prevention of oxidation during brazing

– 15 –

Nitrogen
gas

3. CONSTRUCTION VIEWS

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3-1. Indoor Unit

RAS-M10YKV-E, RAS-M13YKV-E
RAS-M10YKCV-E, RAS-M13YKCV-E

Air inlet

265

Air outlet

Air filter

790

Heat exchanger

50 94

47

189

47

Knock out system

50

10

External
length reference

Hanger

26

46

265

178,5

37

3,5

790

Hanger

232 326 232

321

Connecting pipe (0,39m)

Hanger

Drain hose (0,54m)

Connecting pipe (0,49m)
(Flare ø6,35)(Flare ø9,52)

65965,5

65,5
450
344
326

Minimum
distance

2,5

to ceiling

66 or more

Minimum
distance

17 20

to wall

20 20

120 or more 120 or more

37

Hanger

60,5

126269319

10,5

76

Hanger

Installation
plate outline

Center line

790

Front panel

Back body

47

50

10

Knock out system

Hanger

For stud bolt
(ø8~ø10)

For stud bolt
(ø6)

Minimum
distance to wall

40,5

Wireless
remote control

55

136

16

– 16 –

3-2. Outdoor Unit

RAS-M18YAV-E
RAS-M18YACV-E

310

A leg part

296

270

600

ø25 drain hole

115

76

90

ø11 × 17U-shape hole

50

(For ø8-ø10 anchor bolt)

Hanger

(ø6 hole pitch)

(Anchor bolt long hole pitch)

B leg part

ø4,5 embossing (ø4STS used)
(For sunshade roof attaching)

14749,5

21

540

550

8

Fan guard

16

115,5

780 61

8-ø6 hole
(For fixing outdoor unit)

ø11 × 17 long hole

(For ø8-ø10 anchor bolt)

Valve cover

Charging
port

122,8

Earth terminal

157

332

59

21

Z

53 53 53

96,2

Connecting pipe port

(Pipe dia.ø6,35)

Connecting pipe port

(Pipe dia.ø9,52)

4 × ø11 × 17U-shape hole
(For ø8-ø10 anchor bolt)

Intake

100 or

C

310

more

200 or more

Mounting dimensions of anchor bolt

600

50 or

more

D

Outlet

B

Intake

Outside line
of product

4 × ø11 × 17 long hole
(For ø8-ø10 anchor bolt)

Z

view

A

250 or more

(Minimum distance
from wall)

Detailed A leg part

50
36

11

310

296

R5,5

11

310

296

36
50

Detailed B leg part

600

2-ø6 hole

2-ø6 hole

600

R15

Outside line
of product

Outside line
of product

R15

R5,5

– 17 –

4-1. Indoor Unit

RAS-M10YKV-E, RAS-M13YKV-E
RAS-M10YKCV-E, RAS-M13YKCV-E

BLK
P04

SG01 DSA

VARISTOR

T6,3A 250V

F01 FUSE

INDOOR

TERMINAL

BLOCK

3

2

BLK

1
2
3

WHI
RED

CN30

4. WIRING DIAGRAM

LOUVER

MOTOR

R109

R116

J04

R21

IC04

L01

C15

MAIN P.C. BOARD

(MCC-772)

BLU

PNK

YEL

ORN

RED

6 5 4 3 2 1
6 5 4 3 2 1

CN07

R01

C01

C02

BRW

DB01

FAN MOTOR

DC MOTOR

4 3 2

5

4

3 211

5

CN10

TO1

C06

65

DC35V

DC12V

DC7V

DC0V

IC02

OUTDOOR

UNIT

Check items

OPERATION
indicator

Terminal
block

Fuse
6,3A

DC 5V

DC 12V

DC 35V

GRN & YEL

INDOOR

UNIT

CN23

CN13

1

2

3

4

BLU

BLU

BLU

BLU

1

2

3

1

1

INFRARED RAYS RECEIVE

AND INDICATION PARTS

4

2

3

4

5

BLU

5
5

6

BLU

6
6

4

7

PNK

7
7

8

BLK

8
8

9

WHI

9
9

Table 4-1-1 Simple check points for diagnosing faults

Diagnosis result

Check to see if the OPERATION indicator goes on and off when the main
switch or breaker is turned on, or the power cord is plugged in the wall
outlet. (Check the primary and secondary voltage of transformer.)

Check for power supply voltage between  – . (Refer to the name
plate.) (Check the primary and secondary voltage of transformer.)
Check for fluctuate voltage between  – . (DC 15 to 60V)

Check to determine if the fuse is open.
(Check Varistor : R109, R21)

Check for voltage at the pink lead of the infrared rays receive parts.
(Check the transformer and the rated voltage power supply circuit.)

Check for voltage at the  lead of louver motor.
(Check the transformer and the rated voltage power supply circuit.)

Check for voltage at the CN10 connector side point.
(Check the transformer and the rated voltage power supply circuit.)

CN25

CN03

21
21

BLK

BLK

THERMO
SENSOR

(TA)

IC

IC01

CN01

BLK

IDENTIFICATION

GRN

&YEL

21
21

BLK

HEAT

EXCHANGER

SENSOR

(TC)

COLOR

BROWNBRW :
REDRED :
WHITEWHI :
YELLOWYEL :
BLUEBLU :
BLACKBLK :
GRAYGRY :
PINKPNK :
ORANGEORN :
GREEN &

:

YELLOW

For detailed diagnostic procedure, refer to the ser vice data.
DSA : Surge Absorber

– 18 –

4-2. Outdoor Unit

RAS-M18YAV-E

ORN P10

G
E
A

~

MODULE

–

CONVERTER

~

DB01

+

YEL

+
BU
EU
BV
EV

BW
EW

BX

IGBT MODULE

BY

BZ

–

Q200

BLU

P09

P19
P20

P18
P17

4 way
valve

3

CN701

POWER RELAY

ELECTRONIC

STARTER

P.C. BOARD

MCC-758

REACTOR

1

11223

L01

POWER
SUPPLY

220–230–240V~

FAN MOTOR

FM

PNK

YEL

RED

WHI

CN300

BLK

321
321

P06

SURGE

ABSORBER

VARISTOR

L03

GRY

221

P07P08

C14C12

CN301

RELAY

RY04

C15C13

CT

RELAY
RY06

1234455
123

F03
FUSE
15A

F04
FUSE
3,15A

50/60Hz

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

L

WHI

BLKBLK

F01
FUSE
25A

To

INDOOR

UNIT

A

N 1 2 3 1 2 3

BRW

1

RED

2

CN704

ORN

3

YEL

4

1

CN501

313

P11

YEL

YEL

P12
P13

P14

REDP21
WHI

P22

BLKP23

REACTOR

11
22

REACTOR

PUR

1

1

2

2

3

3

To

INDOOR

UNIT

B

THERMOSTAT for COMPRESSOR

ORN

P04

RED

P05

WHI

P06

BRW

1

1

RED

2

2

CN15

ORN

3

3

YEL

4

4

BLK

GRY

CM

F01

FUSE 6,3A

P02
P01

PHOTO

COUPLER

SUB

P.C. BOARD

MCC-775

COMPRESSOR

CN01

WHI

CN08

WHI

CN02

WHI

CN03

WHI

CN04

BLK

CN05

YEL

CN14

CN13

1 1
2 2

1 1
2 2

1 1
2 2
3 3

1 1
2 2

1 1
2 2

1 1
2 2
3 3

6 6
5 5
4 4
3 3
2 2
1 1

6 6
5 5
4 4
3 3
2 2
1 1

GRY
RED
BLU
ORN
YEL
WHI

GRY
RED
BLU
ORN
YEL
WHI

BLK

YEL

TE

TD

TO

TS

TGa

P.M.V.

A UNIT

P.M.V.

B UNIT

– 19 –

COLOR IDENTIFICATION

BLK : BLACK
BLU : BLUE

ORN : ORANGE

GRY : GRAY
PNK : PINK
SKB : SKY-BLUE

P.M.V. : PULSE MODULATING VALVE

WHI : WHITE

BRW : BROWN

RED : RED

YEL : YELLOW

PUR : PURPLE

RAS-M18YACV-E

ORN P10

G

E
A
~

MODULE

–

CONVERTER

~

DB01

+

YEL

+
BU
EU
BV
EV

BW
EW

BX

IGBT MODULE

BY
BZ

–

Q200

BLU

P.C. BOARD

P09

POWER RELAY

ELECTRONIC

P19
P20

P18
P17

REACTOR

CN701

MCC-758

STARTER

CN704

CN501

P11

P12
P13

P22

To

INDOOR

UNIT

A

BRW

1

RED

2

ORN

3

YEL

4

1

313

YEL
YEL

P14

REDP21
WHI
BLKP23

POWER

SUPPLY

220–230–240V~

FAN MOTOR

FM

1

123

L01

PNK

YEL

RED

WHI

GRY

221

P07P08

C14C12

CN301

C15C13

CT

RELAY
RY06

1234455
123

F03
FUSE
15A

F04
FUSE
3,15A

CN300

BLK

321
321

P06

SURGE

ABSORBER

VARISTOR

L03

50/60Hz

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

L

N 1 2 3 1 2 3

BLKBLK

WHI

F01
FUSE
25A

REACTOR

11
22

REACTOR

PUR

1

1

2

2

3

3

To

INDOOR

UNIT

B

THERMOSTAT for COMPRESSOR

ORN

P04

RED

P05

WHI

P06

BRW

1

1

RED

2

2

CN15

ORN

3

3

YEL

4

4

BLK

GRY

FUSE 6,3A

P02
P01

F01

PHOTO

COUPLER

SUB

P.C. BOARD

MCC-775

COMPRESSOR

CM

CN08

WHI

CN02

WHI

CN03

WHI

CN04

BLK

CN05

YEL

CN14

CN13

1 1
2 2

1 1
2 2
3 3

1 1
2 2

1 1
2 2

1 1
2 2
3 3

6 6
5 5
4 4
3 3
2 2
1 1

6 6
5 5
4 4
3 3
2 2
1 1

GRY
RED
BLU
ORN
YEL
WHI

GRY
RED
BLU
ORN
YEL
WHI

BLK

YEL

TD

TO

TS

TGa

P.M.V.

A UNIT

P.M.V.

B UNIT

– 20 –

COLOR IDENTIFICATION

BLK : BLACK

BLU : BLUE

ORN : ORANGE

GRY : GRAY
PNK : PINK

SKB : SKY-BLUE

P.M.V. : PULSE MODULATING VALVE

WHI : WHITE

BRW : BROWN

RED : RED

YEL : YELLOW

PUR : PURPLE

5. SPECIFICATIONS OF ELECTRICAL PARTS

5-1. Indoor Unit

RAS-M10YKV-E, RAS-M13YKV-E / RAS-M10YKCV-E, RAS-M13YKCV-E

No. Parts name Type Specifications

1 Fan motor (for indoor) TICF-35-19-4 DC35V, 19W
2 Thermo. sensor (TA-sensor) ( – ) 10kΩ at 25°C
3 DC-DC transformer (T01) SWT-34 or SWT-46 DC390V, Secondary DC35V, 12V, 7V

4 Microcomputer

Heat exchanger temp. sensor

5

(TC-sensor)
6 Line filter (L01) UF-253Y0R7 25mH, AC0,7A
7 Diode (DB01) RBV-406 or D3SBA60 4A, 600V
8 Capacitor (C02) KMH450VNSN100M25B 100µF, 450V
9 Fuse (F01) TSCR6,3A T6,3A, 250V

10 Power supply IC (IC01) MA2830-FJ 4A, 600V
11 Varistor (R21, R109) 15G561K 560V
12 Resistor (R01) ERF-5TK5R6 5,6Ω, 5W
13 Louver motor MP35EA7 Output (Rated) 2W, 10poles, 1phase DC12V

5-2. Outdoor Unit

RAS-M18YAV-E / RAS-M18YACV-E

No. Parts name Model name Rating

1 SC coil (Noise filter)

2 DC-DC transformer SWT-43 Secondary side
3 Reactor CH38Z-K L=10mH, 16A x 2

4 Reactor CH43Z-K L=10mH, 1A
5 Outside fan motor ICF-140-40-7 DC140V, 40W

6 Fan control relay AJQ1341

Suction temp. sensor

7

(TS sensor)

Discharge temp. sensor

8

(TD sensor)

Outside air temp. sensor

9

(TO sensor)

Temp. sensor at A room

10

gas side (TGa sensor) RAS-M18YAV-E .............62kΩ (20°C)

11 Terminal block (9P) ——— 20A, AC250V
12 Terminal block (3P) ——— 20A, AC250V

13 Fuse

14 Electrolytic capacitor
15 Transistor module 6MBI25GS-060-01 25A, 600V

16 Compressor DA130A1F-21F 3-phases 4-poles 1100W
17 Compressor thermo. PW-2AL OFF: 125 ± 4°C, ON: 90 ± 5°C
18 Converter module MP7002 Diode: 25A, 600V, IGBT: 40A, 600V

Heat exchanger temp. sensor

19

(TE-sensor) (H/P only)

L03 SC-15-S06J 15A, 0,6mH
L01 SC-20-01J 20A, 150µH

TMP87PM40AF or

TMP87CM40AF

( – ) 10kΩ at 25°C

Primary side DC280V
7,5V x 1, 13V x 1, 26,5V x 3, 16V x 1, 15V x 1

Coil DC12V
Contact AC125V, 3A

(Inverter attached) 10kΩ (25°C)
(Inverter attached) 62kΩ (20°C)
(Inverter attached) 10kΩ (25°C)
(Inverter attached)

For protection of

switching power source

For protection of transistor

module breakage

For protection of

inverter input overcurrent

LLQ2G501KHUATF

400LISN500K35F

(Inverter attached) 10kΩ at 25°C

RAS-M18YACV-E .......... 10k Ω (25°C)

3,15A, AC250V
15A, AC250V
25A, AC250V
500µF, DC400V X 4 pieces

– 21 –

6. REFRIGERANT CYCLE DIAGRAM

6-1. Refrigerant Cycle Diagram

RAS-M10YKV-E, RAS-M13YKV-E
RAS-M18YAV-E

To B room

INDOOR UNIT

Indoor heat

exchanger

T1 Temp. measurement

To B room

P

Pressure measurement
Gauge attaching port

Vacuum pump connecting port

Deoxidized copper pipe
Both A and B rooms

Outer dia. : 9,52mm
Thickness : 0,8mm

Muffler
Ø25 x 80

4 way valve
(VHV-0213)

Accumulating tank
Ø51 x 200
(290cc)

TS

Cross flow fan

Deoxidized copper pipe
Both A and B rooms
Outer dia. : 6,35mm
Thickness : 0,8mm

Sectional shape
of heat insulator

Muffler
Ø25 x 80

TGa

Muffler
Ø25 x 80

Muffler
Ø25 x 160

TD

Compressor
DA130A1F-21F

Outdoor heat

exchanger

Split capillary

Strainer

Ø1,5 x 200

Allowable height

difference : 10m

Strainer
Capillary

Ø2,2 x 200

Pulse modulating
valve at liquid side
(SEV15RC2)

Per 1 unit
Max. : 20m
Total : 30m

Allowable pipe length

Temp. measurement

T

2

Propeller fan

OUTDOOR UNIT

Ø1,5 x 200

TE

NOTE :

Refrigerant amount : 1,15kg

Gas leak check position
Refrigerant flow (Cooling)
Refrigerant flow (Heating)

T able 6-1-1

Each length in one room

Total length in two rooms

Unnecessary to add refrigerant

A room B room

(Standard) 10 m 5 m 5 m Do not add the refrigerant

(Maximum) 30 m 20 (10) m 10 (20) m Do not add the refrigerant

NOTE :

• The maximum pipe length of this air conditioner is 30 m. The additional charging of refrigerant is unneces­sary because this air conditioner is designed with charge-less specification.

• To connect only one indoor unit, use connecting pipe with length by 5m or more.

– 22 –

RAS-M10YKCV-E, RAS-M13YKCV-E
RAS-M18YACV-E

To B room

INDOOR UNIT

Indoor heat

exchanger

T1

Temp. measurement

To B room

P

Pressure measurement
Gauge attaching port

Vacuum pump connecting port

Deoxidized copper pipe
Both A and B rooms

Outer dia. : 9,52mm
Thickness : 0,8mm

Muffler
Ø25 x 80

Accumulating tank
Ø51 x 200
(290cc)

TS

Muffler
Ø25 x 80

Outdoor heat

exchanger

Cross flow fan

Deoxidized copper pipe
Both A and B rooms
Outer dia. : 6,35mm
Thickness : 0,8mm

Sectional shape
of heat insulator

TGa

TD

Compressor
DA130A1F-21F

Split capillary

Ø1,5 x 200

Allowable height

difference : 10m

Strainer

Capillary
Ø2,2 x 200

Pulse modulating
valve at liquid side
(SEV15RC2)

Per 1 unit
Max. : 20m
Total : 30m

Allowable pipe length

Temp. measurement

T

2

Propeller fan

OUTDOOR UNIT

Ø1,5 x 200

TE

NOTE :

Refrigerant amount : 1,15kg

Gas leak check position
Refrigerant flow

T able 6-1-2

Each length in one room

Total length in two rooms

Unnecessary to add refrigerant

A room B room

(Standard) 10 m 5 m 5 m Do not add the refrigerant

(Maximum) 30 m 20 (10) m 10 (20) m Do not add the refrigerant

NOTE :

• The maximum pipe length of this air conditioner is 30 m. The additional charging of refrigerant is unneces­sary because this air conditioner is designed with charge-less specification.

– 23 –

6-2. Operation Data

<Cooling>

Temperature

condition (°C)

Indoor Outdoor

27/19 35/–

<Heating>

Temperature

condition (°C)

Indoor Outdoor

20/– 7/6

No. of

operating

units

1 unit

2 units

No. of

operating

units

1 unit

2 units

Operating combination

(Unit)

AB

M13YKCV -E
M13YKV -E

M10YKCV -E
M10YKV -E

M13YKCV -E M10YKCV -E
M13YKV -E M10YKV-E

M10YKCV -E M10YKCV -E
M10YKV -E M10YKV-E

Operating combination

(Unit)

AB

M13YKV-E 3,5 to 3,7

M10YKV-E 3,3 to 3,5
M13YKV-E M10YKV-E 2,5 to 2,7
M10YKV-E M10YKV-E 2,5 to 2,7

Standard

pressure

P (MPa)

0,7 to 0,9

0,9 to 1,1

0,8 to 1,0

0,8 to 1,0

Standard

pressure

P (MPa)

Heat exchanger

pipe temp.

T1 (°C) T2 (°C)

9 to 11 46 to 48 High High 62

11 to 13 45 to 47 High MED. 38

11 to 13 50 to 52 High High 74

10 to 12 50 to 52 High High 74

Heat exchanger

pipe temp.

T1 (°C) T2 (°C)

53 to 55 0 to 2 High High 79
48 to 50 0 to 2 High MED. 63
41 to 43 –2 to 0 High High 9 7
41 to 43 –2 to 0 High High 9 7

Indoor Outdoor Compressor

fan fan revolution

mode mode (rps)

Indoor Outdoor Compressor

fan fan revolution

mode mode (rps)

NOTES :

(1) Measure surface temperature of heat exchanger pipe around center of heat e xchanger path U bent.

(Thermistor themometer)

(2) Connecting piping condition : 5 m x 2 units

– 24 –

7-1. Indoor Unit

Heat Exchanger Sensor

Temperature Sensor

Infrared Rays Signal Receiver

7. CONTROL BLOCK DIAGRAM

Indoor Unit Control Panel

M.C.U

Functions

• Louver Control

• 3-minute Delay at Restart for Compressor

Operation

Display

Timer

Display

Infrared

Initializing Circuit

Rays

Clock Frequency

Oscillator Circuit

Remote

Control

From Outdoor Unit

REMOTE CONTROL

RAS-M10YKV-E, RAS-M13YKV-E

(Heat pump model)

Power Supply

Circuit

Noise Filter

• Motor Revolution Control

• Processing
(Temperature Processing)

• Timer

• Serial Signal Communication

Louver ON/OFF Signal

Serial Signal Transmitter/Receiver

Serial Signal Communication

RAS-M10YKCV-E, RAS-M13YKCV-E

Infrared

Rays

Louver Driver

(Cooling only model)

ECONO.

Sign Display

FAN-ONLY

Sign Display

Indoor

Fan Motor

Louver

Motor

Infrared

Rays

Remote Control

Operation (START/STOP)

Operation Mode Selection

AUTO, COOL, DRY, HEAT

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

ECONO.

Remote Control
Operation (START/STOP)
Operation Mode Selection

AUTO, COOL, DRY, FAN ONLY

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

ECONO.

– 25 –

7-2. Outdoor Unit (Inverter Assembly)

RAS-M18YAV-E

CONTROL BLOK DIAGRAM (Outdoor unit)

220–230–240 V ~ 50 Hz

MCC-775 (SUB P.C.B) MCC-758 (MAIN P.C.B)

– 26 –

Outdoor Heat­exchanger
temp.sensor

Discharge
temp. sensor

Suction temp.
sensor

Gas side pipe
temp. sensor

Outdoor air
temp. sensor

A unit

send/receive

circuit

B unit

send/receive

circuit

M.C.U

• Inverter output frequency control

• A/D converter function

• P.M.V. control

• Discharge temp. control

• Error display

• Signal communication to MCU

Driver circuit of P.M.V.

A unit

P.M.V.

B unit

P.M.V.

Noise

filter

M.C.U

• PWM synthesis function

• Input current release control

• IGBT over-current detect control

• Outdoor fan control

• High power factor correction control

• Signal communication to MCU

High power factor

correction circuit

Converter

(AC DC)

Relay
RY04

Input current

Sensor

Over current
detect circuit

Rotor position

detect circuit

Rotor position

detect circuit

Over current

detect circuit

Gate drive

Over current

sensor

Over current

sensor

circuit

Gate drive

circuit

Inverter

AC)

(DC

Inverter

(DC AC)

Outdoor

fan motor

Compressor

P.M.V. : Pulse Modulating Valve
PWM : Pulse Width Modulation
IGBT : Insulated Gate Bipolar Transistor

4 way valve

RAS-M18YACV-E

CONTROL BLOK DIAGRAM (Outdoor unit)

220–230–240 V ~ 50 Hz

MCC-775 (SUB P.C.B) MCC-758 (MAIN P.C.B)

– 27 –

Discharge
temp. sensor

Suction temp.
sensor

Gas side pipe
temp. sensor

Outdoor air
temp. sensor

A unit

send/receive

circuit

B unit

send/receive

circuit

M.C.U

• Inverter output frequency control

• A/D converter function

• P.M.V. control

• Discharge temp. control

• Error display

• Signal communication to MCU

Driver circuit of P.M.V.

A unit

P.M.V.

B unit

P.M.V.

M.C.U

• PWM synthesis function

• Input current release control

• IGBT over-current detect control

• Outdoor fan control

• High power factor correction control

• Signal communication to MCU

High power factor

correction circuit

Noise

filter

Input current

Sensor

Converter

(AC DC)

Over current
detect circuit

Rotor position

detect circuit

Over current
detect circuit

Gate drive

Over current

sensor

Over current

sensor

Rotor position

circuit

detect circuit

Gate drive

circuit

Inverter

(DC AC)

Inverter

AC)

(DC

Outdoor

fan motor

Compressor

P.M.V. : Pulse Modulating Valve
PWM : Pulse Width Modulation
IGBT : Insulated Gate Bipolar Transistor

8. OPERATION DESCRIPTION

8-1. Outline of Air Conditioner Control

This air conditioner is a capacity-variable type air
conditioner, which uses DC motor f or the indoor fan
motors and the outdoor fan motor . And the capacity­proportional control compressor which can change
the motor speed in the range from 13 to 120 rps is
mounted. The DC motor drive circuit is mounted to
the indoor unit. The compressor and the inverter to
control fan motor are mounted to the outdoor unit.
The entire air conditioner is mainly controlled by the
indoor unit controller.

The indoor unit controller drives the indoor fan motor
based upon command sent from the remote control,
and transfers the operation command to the outdoor
unit controller.

The outdoor unit controller receives operation
command from the indoor unit side, and controls the
outdoor fan and the pulse modulating valv e.
Besides, detecting revolution position of the com­pressor motor, the outdoor unit controller controls
speed of the compressor motor by controlling output
voltage of the inv erter and switching timing of the
supply power (current transfer timing) so that motors
drive according to the operation command. And
then, the outdoor unit controller transfers re v ersely
the operating status information of the outdoor unit
to control the indoor unit controller.

As the compressor adopts four-pole
brushless DC motor, the frequency of the
supply power from in verter to compressor is
two-times cycles of the actual number of
revolution.

(1) Role of indoor unit controller

The indoor unit controller judges the operation
commands from the remote control and as­sumes the following functions.

• Judgment of suction air temperature of the
indoor heat exchanger by using the indoor
temp. sensor.

• Temperature setting of the indoor heat ex­changer by using heat exchanger sensor
(Prevent-freezing control)

• Louver motor control

• Indoor fan motor operation control

• LED display control

• Transferring of operation command signal
(Serial signal) to the outdoor unit

• Reception of information of operation status
(Serial signal including outside temp. data) to
the outdoor unit and judgment/display of error

(2) Role of outdoor unit controller

Receiving the operation command signal (Serial
signal) from the indoor controller, the outdoor
unit performs its role.

• Compressor operation

Operations followed

control

• Operation control of
outdoor fan motor

• P.M.V. control

• Detection of inverter input current and current
release operation

• Over-current detection and prev ention opera­tion to transistor module (Compressor stop
function)

• Compressor and outdoor fan stop function
when serial signal is off (when the serial signal
does not reach the board assembly of outdoor
control by trouble of the signal system)

• Transferring of operation information (Serial
signal) from outdoor unit to indoor unit

• Detection of outdoor temperature and opera­tion revolution control

• Defrost control in heating operation (Temp.
measurement by outdoor heat exchanger and
control for four-w ay valve and outdoor fan)



to judgment of serial



signal from indoor
side.



– 28 –

(3) Contents of operation command signal (Serial

signal) from indoor unit controller to outdoor unit
controller

The following three types of signals are sent
from the indoor unit controller.

• Operation mode set on the remote control

• Compressor revolution command signal defined
by indoor temperature and set temperature
(Correction along with variation of room
temperature and correction of indoor heat
exchanger temperature are added.)

• For these two types of signals ( [Operation
mode] and [Compressor revolution] ), the
outdoor unit controller monitors the input
current to the inverter, and perf orms the
followed operation within the range that
current does not exceed the allowab le value.

• T emperature of indoor heat e xchanger b y indoor
heat exchanger sensor
(Minimum revolution control)

(4) Contents of operation command signal (Serial

signal) from outdoor unit controller to indoor unit
controller

The following signals are sent from the outdoor
unit controller.

• The current operation mode

• The current compressor revolution

• Outdoor temperature

• Existence of protective circuit operation
For transf erring of these signals, the indoor

unit controller monitors the contents of signals,
and judges existence of trouble occurrence .

Contents of judgment are described below.

• Whether distinction of the current operation
status meets to the operation command
signal

• Whether protective circuit operates
When no signal is received from the

outdoor unit controller, it is assumed as a
trouble.

8-1-1. Capacity Control

The cooling capacity is varied by changing compres­sor motor speed. The inverter changes compressor
motor speed by changing AC 220–230–240V pow er
to DC once, and controls capacity by changing
supply power status to the compressor with transis­tor module (includes 6 transistors). The outline of the
control is as follows: The revolution position and
revolution speed of the motor are detected b y
detecting winding electromotive force of the com­pressor motor under operation, and the revolution
speed is changed so that the motor drives based
upon revolution speed of the operation command b y
changing timing (current transfer timing) to e x­change inverter output voltage and supply power
winding.

Detection of the revolution position f or controlling is
performed 12 times per 1 rev olution of compressor.
The range of supply power frequency to the com­pressor differs according to the operation status
(COOL, DRY).

Table 8-1-1 Compressor revolution range

Operation

mode

COOL

HEAT

No. of

operating revolution

unit

1 unit

2 units

1 unit

2 units

Combination

of indoor units

M10 — 13 to 45
M13 — 13 to 69
M10 M10 13 to 91
M13 M10 13 to 91
M10 — 13 to 72
M13 — 13 to 92
M10 M10 13 to 120
M13 M10 13 to 120

Compressor

(rps)

8-1-2. Current Release Control

The outdoor main circuit control section (Inverter
assembly) detects the input current to the outdoor
unit. If the current v alue with compressor motor
speed instructed from indoor side exceeds the
specified value, the outdoor main circuit control
section controls compressor motor speed by reduc­ing motor speed so that value becomes closest to
the command within the limited value.

8-1-3. Power Factor Improvement Control

Po w er f actor impro v ement control is perf ormed
mainly aiming to reduce the current on much power
consumption of cooling / heating operation. Control­ling starts from the time when input power has
reached at a certain point. To be concrete, IGBT of
the power factor improvement circuit is used, and
the power factor is impro ved by keeping IGBT on for
an arbitrary period to widen electro-angle of the
input current.

– 29 –

8-1-4. Prevent-Freezing Control

8-1-6. Louver Control

The indoor heat exchanger sensor detects refriger­ant vapor temperature in COOL/DR Y operation. If
the temperature is below the specified value, com­pressor motor speed is reduced so that operation is
performed in temperature below the specified value
to prevent-freezing of indoor heat e xchanger.

8-1-5. P. M. V. (Pulse Modulating Valve)

Using P.M.V., refrigerant flow of refrigeration cycle is
varied for the optimum temperature . Controlling
each unit separately by two P.M.V. corresponds to
difference of pipe length, fan speed, and unit tem­perature.

If an error occurs on cycle temperature when power
source of the air conditioner has been turned on,
and if start/stop times of the outdoor unit are 30
times, move the valve once until it hits on the
stopper for positioning of the valve. In this case,
ticktack sound may be heard.

(1) Vertical air flow louvers

Positions of v ertical air flow louvers are auto­matically controlled according to the operation
status (AUTO, COOL, DRY, HEAT). Besides,
positions of vertical air flow louvers can be
arbitrarily set by pressing the [SET] button. The
louver position which has been set by the [SET]
button is stored in microcomputer , and the louv er
is automatically set at the stored position in the
next operation.

(2) Swing

If the [AUTO] button is pressed during running
operation, vertical air flow louvers start swinging.
When the [AUTO] button is pressed again,
swinging stops.

8-1-7. Indoor Fan Control (DC Fan Motor)

The indoor fan is operated by motor speed non-step
variable DC drive system motor. For flow rate, motor
speed is controlled manually in three steps (LOW,
MED , HIGH), and with the unit of 10 rpm from upper
limit to lower limit in AUTO mode as described in
Table 8-1-2. It is not selected by relay, so selecting
sound does not generate.

T able 8-1-2

M10 M13

Operation Fan

mode mode

H 1100 470 1200 520

COOL M 1010 440 1140 470

L 910 380 1050 380

DRY — 810 320 820 330

H 1200 520 1280 560

HEAT M 1100 470 1100 470

L 930 390 930 390

Motor speed Air flow rate Motor speed Air flow rate

(rpm) (m³/h) (rpm) (m³/h)

– 30 –

8-1-8. Outdoor Fan Control (DC Fan Motor)

Although the outdoor fan motor drives the outdoor fan b y non-step variable system of the revolution speed, the
revolution speed is restricted to three steps on the conv enience of controlling. If a strong wind is lashing outside
of the room, the operation may be continued as the outdoor fan stops in order to protect the outdoor fan motor.

If a fan lock occurred due to entering of foreign matter, the air conditioner stops and an alarm is displayed.

<COOL, DRY>

T able 8-1-3

Compressor revolution (rps) ~ 17,4 ~ 47,9 48 ~

Outdoor temp. sensor

TO

TO ≥ 38°C 500 (rpm) 820 (rpm) 820 (rpm)

TO < 38°C 500 (rpm) 700 (rpm) 820 (rpm)

TO ≥ 38°C 500 (rpm) 700 (rpm) 820 (rpm)

ECONO. operation

TO < 38°C 500 (rpm) 500 (rpm) 700 (rpm)

TO is abnormal 700 (rpm) 700 (rpm) 820 (rpm)

<HEAT>

T able 8-1-4

Compressor revolution (rps) ~ 28,1 ~ 72,9 73,0 ~

Outdoor temp. sensor

TO

TO ≥ 5°C 450 (rpm) 650 (rpm) 820 (rpm)
TO < 5°C 650 (rpm) 650 (rpm) 820 (rpm)
TO ≥ 5°C 450 (rpm) 450 (rpm) 650 (rpm)

ECONO. operation

TO < 5°C 450 (rpm) 650 (rpm) 650 (rpm)

TO is abnormal 450 (rpm) 650 (rpm) 820 (rpm)

8-2. Description of Operation Circuit

• Turning [ON] the breaker flashes the operation
lamp.

This is the display of power-ON (or notification of
power failure).

• When pushing [START/STOP] button of the
remote control, receive sound is issued from the
main unit, and the next operations are performed
together with opening the vertical air flow louvers.

8-2-1. Fan Only Operation

(The Remote Control MODE Button is
Set to the FAN ONLY Operation)

• Once the setting is made, the operation mode is
memorized in the microcomputer so that the
same operation can be effected thereafter simply
by pushing [START/STOP] button.

• When the FAN button is set to the AUT O position,
the indoor fan motor operates as shown in Fig. 8­2-1. When the FAN SPEED b utton is set to
LOW, MED, or HIGH, the motor operates with a
constant air flow .

• ECONO. mode cannot be set.

˚C

Set
temp.

(Room temp.) – (Set temp.)

+3
+2,5
+2
+1,5
+1
+0,5
0

(Set temp.) 25˚C

M+
*1
*1
*1
L–

NOTE :

*1 :Calculated from difference in motor speed of M+

and L–, and controlled.

Fig. 8-2-1 Auto setting of air flow

– 31 –

8-2-2. Cooling Operation

Normal control

11,5

11,0

Current value (A)

Comp. motor
speed down

Comp. motor
speed keep

(The Remote Control MODE Button is
Set to the COOL Position)

• Once the setting is made, the operation mode is
memorized in the microcomputer so that the
same operation can be effected thereafter simply
by pushing [START/STOP] button.

• A cooling operation signal is transmitted to
outdoor unit.

• The indoor fan motor operates as shown in Fig.8­2-2 when F AN button is set to AUTO.

• The motor operates with a constant air flow when
the FAN button is set to LOW, MED, or HIGH.

• The outdoor unit controls the outdoor fan relay
R01, R02 and R03, and the compressor motor
speed according to the operation command
signal sent from the indoor unit.

˚C

+3
+2,5
+2
+1,5
+1

(Room temp.) – (Set temp.)

+0,5

Set
temp.

0
–0,5

NOTE :

1: Calculated from difference in motor speed of

*

M+ and L–, and controlled.

M+
*1
*1
*1

L–

In normal
operation

(1) Cooling capacity control

• The cooling capacity and room temperature
are controlled by changing the compressor
motor speed according to both the difference
between the temperature detected by the
room temperature sensor and the temperature
set by TEMP button and also any change in
room temperature.

• When compressor has been activated or
reactivated, it operates with Max. 28 rps for 1
minute, with Max. 57 rps from 1 minute to 3
minutes, and with Max. 83 rps after 3 minutes
passed.

• When room temperature is lower than set
temperature, indoor fan motor is oper ated at
fan speed L– as shown in Fig. 8-2-2 while the
outdoor unit stops.

(2) Prevent-freezing control

If temperature of indoor heat exchanger de­tected by the indoor heat exchanger sensor is
5°C or lower , compressor motor speed is
gradually lowered to prevent freezing of the
indoor heat exchanger . If temperature is 7°C or
higher, return the operation to the abov e item
(1).

(3) Current release control

The input current of compressor and outdoor fan
motor (Precisely inverter main circuit control
section) which occupy most of air conditioner
input is detected by the outdoor current sensor ,
and compressor motor speed is gradually
lowered so that current value does not exceed
11,5A if current value exceeds 11,5A. When the
current value lowers to 11,0A, return the opera­tion to the above item (1).

Fig. 8-2-2 Setting of air flow [Fan AUTO]

Fig. 8-2-3

(4) Outdoor temperature release control

The outdoor temperature release is controlled by
changing the current release points 11,5 and
11,0 in the above item according to temperature
detected by the outdoor temperature sensor .

For e xample, if the outdoor temperature is 43°C,
the value of current release point becomes 8,0A.

– 32 –

(5) Limit for maximum compressor motor speed

by indoor fan speed

When outdoor temperature sensor detected
32°C or lower , and indoor heat exchanger
sensor detected 17°C or lower , the maxim um
compressor motor speed is limited by the indoor
fan speed.

For example , when 1 unit only operates , the
compressor motor speed is limited as described
in the table below.

T able 8-2-1

Air flow rate

M10 M13

(rps) (rps)

HIGH 46 69

M+ 42 59

MED. 34 40

L–, L 31 31

UL, SUL 31 31

(6) Louver control

The vertical air flow louvers are automatically set
to horizontal or cool memory position.

When temperature of indoor heat exchanger
becomes 5°C or lower by the pre v ent-freezing
control and the compressor is turned off, the
vertical air flow louvers close once and then
return to the position of previous time.

(7) Discharge temperature control

(Common control to cooling and heating)

The discharge temperature of refrigerant gas
from the compressor is detected by the dis­charge temperature sensor, and controls operat­ing compressor motor speed.

1) Control 1 (A zone) : Normal operation zone

When TD detect value is 101°C or lower, the
operation is performed with operating motor
speed instructed by the serial signal.

2) Control 2 (B zone) : Slow-up zone of motor

speed
When TD detect v alue is 101°C or higher,

operating motor speed is slowly up .

3) Control 3 (C zone) : Keep zone

When TD detect v alue is 108°C or higher,
operating motor speed is not changed if
raising operation speed.

4) Control 4 (D zone) : Slow down zone of motor

speed
When TD detect v alue is 111°C or higher,

operating motor speed is slowly down.

5) Control 5 (E zone) : Normal down of motor

speed
When TD detect v alue is 115°C or higher,

operating motor speed is down.

6) Control 6 (F zone) : Operation stop zone

If TD detect v alue exceeds 120°C during
operation, stop the operation immediately.

Then, restart the operation when TD detect
value becomes 108°C or lower.

TD

(˚C)
120

115

111

108

101

Zone

F

E

D

C

B

A

Operation stop zone

Normal down zone of motor speed

Slow down of motor speed

Keep zone : Motor speed is not changed.

Slow-up zone of motor speed

Normal operation zone

Fig. 8-2-4 Compressor motor speed contr ol

– 33 –

Release of motor speed

(8) ECONO. operation contr ol

When the ECONO. button of the remote control
is pushed, quiet and mild operation is performed
by restraining air flow and operating motor
speed.

1) Indoor air flow is controlled between SUL
and L– (Low air (–)).

2) Setting M10 at 23,3 rps and M13 at 26,3 rps
as the maximum operating compressor motor
speed, the minimum capacity operation range
is widened every 1 hour and 2 hours hav e
passed after ECONO. operation had started.

Compressor motor speed

3,5

3

2,5

2

1,5

(Room temp.) – (Set temp.)

1

0,5

8-2-3. DRY Operation

(The Remote Control MODE Button is
Set to the DRY Position)

Fig. 8-2-5

Time2H1H

Air volume

+2,5

M13M10

20 rps16 rpsL–

13 to 20 rps13 to 16 rpsUL

13 rps13 rpsSUL

• Once the setting is made, the operation mode is
memorized in the microcomputer so that the
same operation can be effected thereafter simply
by pushing [START/STOP] button.

• Dry operation signal is transmitted to outdoor
unit.

• The Cooling operation giving priority to dehumidi­fying, which restrains the indoor fan speed and
compressor motor speed, is performed.

• The indoor fan motor operates as shown in Fig.
8-2-6. (Fan speed is AUTO only.)

• The outdoor unit controls the outdoor fan relay
R01, R02 and R03, and the compressor motor
speed according to the operation command
signal sent from the indoor unit.

– 34 –

+2,0

+1,5

+1,0

+0,5

(Room temp.) – (Set temp.)

Set
temp.

0

–0,5

NOTE :

*1 : Middle motor speed between L– and SUL

Fig. 8-2-6 Setting of air flow

L–

*1

SUL

8-2-4. Heating Operation

[In starting and in stability]

Transferring of heating operation signal from indoor
unit to outdoor unit starts.

The indoor fan motor operates by the room tempera­ture when selecting “AUTO” of “FAN” as shown in
Fig. 8-2-7, and oper ates with a set air flo w when
selecting “Low” to “High”.

Howev er, to prevent cold draft, re volution speed of
the fan is restricted by indoor heat exchanger when
air flow is AUTO (Fig. 8-2-8) and starting of FAN
Manual.

[Basic control]

Set
temp.

(Room temp.) –

–0,5
–1
–1,5
–2

(Set temp.)

–5,0
–5,5

[FAN AUTO]

0

LOW

1

*

2

*

MED.

HIGH

*1, *2 : Approximate revolution speed of M- and L- to
linear according to temperature.

Fig. 8-2-7 Setting of air flow

[Cold draft preventing control]

The upper limit of fan rev o lution speed is sho wn
below .

45
44

32
31

A + 4
A – 8

FAN

AUTO

33
32

20
19

*

A

A – 8

Starting
of FAN
Manual

2

HIGH

Approximate
revolution speed
of HIGH and SUL
linear by Tc.

3

*

SUL

( NOTE : *1)

SUL

Stop

Fig. 8-2-8 Cold draft preventing control

NOTES :

(1) Stops for 2 minutes after thermostat-OFF.
(2) 24°C when the set temp. is 24°C or more

Set temp. when the set temp. is belo w 24°C

(3) SUL : Super ultra low

FAN
AUTO

FAN
Manual

In starting

• Until 12 minutes
passed after
operation start

• When 12 to 25
minutes passed
after operation start
and room temp. is
3°C or lower than
set temp.

• Room temp. ≤ Set
temp. –4°C

In stability

• When 12 to 25
minutes passed
after operation start
and room temp. is
higher than (set
temp. –3°C)

• When 25 minutes or
more passed after
operation start

• Room temp. > Set
temp. –4°C

The outdoor unit controls the outdoor fan based
upon the operation signal sent from the indoor unit,
and also controls revolution speed of the compres­sor motor.

The power coupler (IC20) for four-way valve is
turned on, and turned off in defrost operation.

(1) Heating capacity control

Calculate the difference between temperature
detected by room temp. sensor every minute and
the set temp. set on “Temp. indicator” and
variation amount of room temp.

Then, obtain the correction amount of the
command signal, and correct the current fre­quency command signal.

(2) High-temp. release contr ol

If temperature of the indoor heat exchanger
detected by the indoor heat exchanger sensor is
55°C or higher, compressor motor speed is
gradually lowered to prev ent over-temp. rising of
compressed pressure.

If temperature becomes below 48°C, return to
above item (1).

(3) Current release control

The input current of compressor and outdoor fan
motor (Precisely inverter main circuit control
section) which occupy most of air conditioner
input is detected by the outdoor current sensor .
The compressor motor speed is lowered gradu­ally according to the range of TO (outside air
temp.) if the input current e xceeds the current
value determined in each zone as shown in Fig.
8-2-9 so that the input current does not exceed
the set value.

In case that the current lowered by appro x. 0,3A
to 0,5A than each set value, return to above item
(1).

– 35 –

TO

16,0
15,5
11,0
10,5

Outside air temp. (˚C)

(4) Defrost control

1) Detection of frost
In heating operation, time duration while the

compressor operates is counted, and defrost
operation starts by any condition described
below .

a. The counted time is 28 minutes or more,

and status that temperature of the outdoor
heat exchanger detected by the outdoor
heat exchanger is –20°C or lower contin­ued for 3 minutes or more.

b. The counted time is 28 minutes or more,

and status that temperature of the outdoor
heat exchanger detected by the outdoor
heat exchanger is –8°C or lower and
temperature lowered by 2,5 °C than the
minimum value of the outdoor heat e x­changer during 10 to 15-minutes count
time continued for 3 minutes or more.

c. The counted time is 34 minutes or more,

and status that temperature of the outdoor
heat exchanger detected by the outdoor
heat exchanger is –5°C or lower and
temperature lowered by 3,0 °C than the
minimum value of the outdoor heat e x­changer during 10 to 15-minutes count
time continued for 3 minutes or more.

d. If the following three conditions are satis-

fied, defrost operation (Timer defrost)
starts after heating operation for 48
minutes.

 Setting on remote control, HEAT

(mode), HIGH (Fan), 30°C (temp .).

 Room temp. is 19°C to 24°C, and

outside air temp. is 5°C or lower.

 Defrost operation has been already

performed once.

Fig. 8-2-9

10,7A

12,0A

13,4A

2) Defrost operation
Operation of the compressor is stopped

once, turn off power coupler for f our-way
valve after 10 seconds, and then exchange
the four-wa y valv e.

After 10 seconds, restart operation of the
compressor. Turn off the outdoor fan just
when the compressor stopped.

If temperature of the indoor heat exchanger
lowered than 38°C, stop the indoor f an.

3) Defrost reset
Resetting operation from defrost to heating is

performed when any one of the following
conditions is satisfied.

a. T emperature of the outdoor heat ex-

changer rose to +8°C or higher.

b. A status that temperature of the outdoor

heat exchanger is +5°C or higher contin­ued for 80 seconds.

c. Defrost operation continued for 10 min-

utes.

In resetting defrost operation, the compressor
stops for 50 seconds if defrost has started
under condition a. to c. in item 1), but the
compressor is reset to heating operation
keeping operated if defrost has started under
condition d. in item 1).

(5) Louver control

The vertical air flow louvers are automatically set
to heating position or heat memory position.
When the compressor is turned off by high-temp.
release control, the vertical air flow louvers close
once and then return to the position of previous
time.

– 36 –

8-2-5. Automatic Operation

8-3. Temporary Operation

(1) As shown in Fig. 8-2-10, the operation mode

(COOL, DRY, HEAT) is selected according to the
outside temperature when the operation has
started.

The operation in Fan mode contin ues until an
operation mode is selected.

If the room temperature is 20°C or higher when
“AUTO” operation started within 2 hours after
“HEAT” operation had stopped, select an opera­tion mode after Fan operation of ultra lo w f an.

In AUTO operation, the set temperature of each
operation can be corrected by the remote control
in the range of Ts = ± 5°C.

TO

Powerful Cool mode

32

Cool mode

22

Fan mode

20

Outside air temp. (˚C)

Heat mode

• Temporary Auto operation, existence of Auto
Restart, and Temporary Cooling operation can be
set by the TEMPORARY button of the indoor
controller.

TEMPORARY
button

TEMPORARY

T able 8-3-1

TEMPORARY b utton Control

OFF → ON Temporary Auto operation start

After pushing button

for 3 seconds

After pushing button Temporary Cooling

for 10 seconds operation star t

Auto Restart control select

Fig. 8-2-10

(2) After selecting the operation mode (COOL, DRY,

HEAT), select an operation mode again when a
status that the compressor was turned off by the
room temperature or outside air temperature
continues for 15 minutes.

(3) After selecting DRY operation, a status that the

room temperature is the set temp. –2°C contin­ues for 15 minutes, select an operation mode
again.

(4) Powerful Cool mode control

When the outside temperature is above 32°C
and indoor temperature is above 28°C , select
Cool mode control. In Cool mode, the air flow
louver directs downward. When the room tem­perature gains access to the set temperature, it
becomes cool memory position.

8-3-1. Temporary Auto Operation

• When the TEMPORARY button is pushed, the
Auto operation with set temperature fixed at 24°C
starts. Controlling is same as that of Auto opera­tion by the remote control.

• When the TEMPORARY button is pushed again,
the operation stops.

• During Temporary Auto operation, operation by
the remote control is accepted.

• Using the Auto Restart function, the Temporary
Auto operation starts when power failure is reset.

8-3-2. Temporary Cooling Operation

• When the TEMPORARY operation button keeps
pushed for 10 seconds, Cooling operation of
which compressor motor speed and the indoor
fan speed are fix ed starts.

Compressor motor speed :

M10 : 31 rps
M13 : 31 rps

Indoor fan speed : Lo w

• When the TEMPORARY operation button is
pushed again, the operation stops.

• Auto Restart function is unavailable.

– 37 –

8-4. Auto Restart Function

8-4-1. How to Set the Auto Restart

This unit is equipped with an Automatic restarting
facility which allows the unit to restart and resume
the set operating conditions in the event of a po wer
supply shutdown without the use of the hand control.

The operation will resume without warning three
minutes after the power is restored.

The Auto Restart function is set not to work on
shipment from the factory, and so it is necessary to
set it to function as required.

• When the system is stand-by (not operating)

Operation

Push the TEMPORARY button
continuously more than three
seconds.

Stand-by

↓

The system starts to operate. The green light goes on.

↓ about three seconds after

0

3S

The unit beeps three times. The orange light goes on.

↓

TEMPORARY

The system is operating.
If the system is not required to run at this time, push the TEMPORARY

button once more or use the remote control and the unit will stop.

To set the Auto Restart function, proceed as follows:
Access the TEMPORARY button located in the lower

right hand corner beneath the hinged front panel of
the indoor unit (please refer to Fig. 8-3-1). The
power supply to the unit must be on - the function
will not be set if the power is off.

To enable the Auto Restart function, push the
TEMPORARY b utton continuously f or three
seconds.

The unit will acknowledge the setting and beep three
times. The system will now restart automatically.

The above A uto Restart settings can be carried out:

Motion

• When the system is operating

Operation

Push the TEMPORARY button
continuously more than three
seconds.

Operating The green light goes on.

↓

The system stops to operate. The green light goes off.

↓ about three seconds after

0

3S

The unit beeps three times.

↓

TEMPORARY

The system stops.
If the system is not required to stop at this time, use the remote control

and to restart.

During subsequent operation, the orange light goes on.

• The Auto Restart function will not accept an
instruction if timer operation with the remote
control is selected.

Motion

• During louver swing (A UTO) operation, after
restart by the Auto Restart function the louver
swing stops.

– 38 –

8-4-2. How to Cancel the Auto Restart

To cancel the Auto Restart function, proceed as
follows:

Repeat the setting procedure: the unit will
acknowledge the instruction and beep three times.

• When the system is stand-by (not operating)

The system will now be required to manually restart
with the remote control after the main supply is
turned off.

Cancellation is carried out:

Operation

Push the TEMPORARY button
continuously more than three
seconds.

0

TEMPORARY

• When the system is operating

Operation

Push the TEMPORARY button
continuously more than three
seconds.

0

TEMPORARY

Motion

Stand-by

↓

The system starts to operate. The orange light goes on.

↓ about three seconds after

3S

The unit beeps three times. The green light goes on.

↓

The system is operating.
If the system is not required to run at this time, push the TEMPORARY

button once more or use the remote control and the unit will stop.

Motion

Operating The orange light goes on.

↓

The system stops to operate. The orange light goes off.

↓ about three seconds after

3S

The unit beeps three times.

↓

The system stops.
If the system is not required to stop at this time, use the remote control

and to restart.

During subsequent operation, the green light goes on.

8-4-3. In Case of Power Failure during the

Timer Operation

(1) If ON-TIMER operation is reserved with setting

of Auto Restart operation, it is cancelled with
power failure . (The OPERATION lamp on the
main unit goes on and off to inform of power
failure.) In that case, try to reserve ON-TIMER
operation once again.

(2) If OFF-TIMER operation is reserved without

setting of Auto Restart operation, the reservation
is cancelled with power failure.
(The OPERATION lamp on the main unit goes
on and off to inform of power failure .) In that
case, try to reserve OFF-TIMER operation.
When Auto Restart operation is set, OFF-TIMER
reservation is also cancelled with power failure.

– 39 –

8-5. Remote Control

8-5-1. Parts Name of Remote Control

START/STOP

Push this button to start/stop the air
conditioner.

AUTO

(Auto louver) button
Push this button to swing the vertical air
flow louvers automatically.

MODE

Push this button to select an operation
mode.

ACL

button
Push this button when the batteries of
the remote control have been replaced.

ON

(On timer) button
Push this button to start the unit at the
time set by the timer.

button

(Mode select) button

MODE

AUTO

COOL

DRY

FAN ONLY

AUTO

MODE

ON OFF

Transmitter

TEMP.

B

˚C

Hr.ON OFF TIMER

TEMP.

START/STOP

SET

ACL

CHK

TIMER

RSV CNL

FAN

AUTO
LOW
MED.
HIGH

FAN

ECONO.

TEMP.

(Temperature) buttons
Push this button to set a desired
temperature.

FAN

(Fan speed) button

Push this button to change air flow.

SET

button

Push this button to change wind direction.

ECONO.

Push this button to operate economically.

CHK

Service man pushes this button to check
the location of a problem.

CNL

Push this button to cancel reservation of
timer operation.

(Economy) button

(Check) button

(Cancel) button

OFF

(Off timer) button
Push this button to stop the unit at the
time set by the timer.

8-5-2. Name of Indications on Remote Control

All indication that appear on the remote control are shown for e xplanation.

<Cooling only model> <Heat pump model>

Transmission indicator
This mark is indicated
when a button is pushed.

Selected operation
mode with the
MODE button is
indicated.

MODE

AUTO
COOL

DRY

FAN ONLY

Selected degree of air
flow (HIGH, MED., LOW
or AUTO) is indicated.

TEMP.

B

˚C

Hr.ON OFF TIMER

Set temperature
is indicated
(17˚C to 30˚C).

FAN

AUTO
LOW
MED.
HIGH

Selected operation mode with
the MODE button is indicated.

MODE

AUTO

COOL

DRY

HEAT

RSV

(Reserve) button
Push this button to reserve timer
operation.

TEMP.

FAN

AUTO
LOW

B

˚C

Hr.ON OFF TIMER

MED .
HIGH

This mark is indicated
when the ECONO.
button is pushed.

Set time for
timer operation
is indicated.

– 40 –

– 41 –

9. INSTALLATION PROCEDURE

9-1. Safety Cautions

Power supply cord of parts of appliance for outdoor use

For general public use

UK PLUGS AND SOCKETS ETC (SAFETY) REGULATIONS 1994, SI NUMBER 1768

With regard to Schedule 3, item 7 of the above UK Regulations, this appliance must be permanently
connected to the fixed wiring of the main electrical supply by means other than the use of an
approved 13 Amp plug-top as outlined in the Regulations.

Electrical work must be carried by suitably qualified persons and in accordance with all relevant
safety standards and codes of practice.

We recommend that the power supply for this appliance is deriv ed from a suitably protected
dedicated circuit.

CAUTION New Refrigerant Air Conditioner Installation

• THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R410A) WHICH DOES
NOT DESTROY OZONE LAYER.

R410A refrigerant is apt to be affected by impurity such as water, oxidizing membrane, and oils
because pressure of R410A refrigerant is approx. 1,6 times of refrigerant R22. Accompanied with
adoption of the new refrigerant, refrigerating machine oil has been also changed. Theref ore, during
installation work, be sure that water, dust, f ormer refrigerant, or refrigerating machine oil does not
enter into the refrigerating cycle of new-refrigerant air conditioner.

T o pre vent mixing of refrigerant or refrigerating machine oil, the sizes of connecting sections of charging
port of the main unit or installation tools are different from those for the conventional refrigerant.
Accordingly , the exclusiv e tools are required for the ne w refrigerant (R410A) as shown below.

For connecting pipes, use new and clean piping materials with high pressure-tight f orce, which w ere
made for R410A only , so that water or dust does not enter. Moreov er, do not use the existing piping
because there are problems about pressure-tight force and inner impurity in the existing piping.

CAUTION To Disconnect the Appliance from the Mains Supply .

This appliance must be connected to the mains by means of a circuit breaker or a switch with a
contact separation of at least 3 mm.

DANGER Engage Dealer or Specialist for Installation.

• FOR ELECTRICAL WORKS THE WIRING AND CABLES MUST BE PERFORMED IN
COMPLIANCE WITH NATIONAL WIRING STANDARD OR REGULATION.

IF INCORRECT AND INCOMPLETE WIRING IS CARRIED OUT, IT WILL CAUSE AN ELECTRI­CAL FIRE OR ELECTRICAL SHOCK.

• USE THE SPECIFIED CABLE (1,0mm² or more) AND CONNECT TIGHTLY FOR INDOOR/
OUTDOOR CONNECTION. CONNECT TIGHTLY AND CLAMP THE CABLE SO THAT
EXTERNAL FORCE WILL BE ACTED ON THE TERMINAL.

• WIRE ROUTING MUST BE PROPERLY ARRANGED SO THAT CONTROL BOARD COVER IS
FIXED PROPERLY.

• DO NOT DAMA GE OR SCRATCH THE CONDUCTIVE CORE AND INNER INSULATOR OF THE
CABLES.

shall be more than polychloroprene sheathed flexible cord
(design H05 RN-F), or cord designation 245 IEC 57.

(for U.K. only)

• DO NOT DEFORM OR SMASH ON THE SURFACE OF THE CABLES. DO NOT PRESS OR FIX
THE CORD AND CABLES FIRMLY WITH STAPLES, etc.

• DO NOT USE THE INTER-CONNECTING CABLE. NEVER EXECUTE THE CONNECTION OF
WIRING WITH OTHER METHOD THAN THE APPROVED ONE. OTHERWISE, OVERHEAT,
SMOKE OR FIRE MAY BE GENERATED BY CONTACT ERROR.

• TURN OFF MAIN POWER SUPPLY AND BREAKER BEFORE ATTEMPTING ANY ELECTRI­CAL WORK. MAKE SURE ALL POWER SWITCHES AND BREAKER TURN OFF. FAILURE TO
DO SO MAY CAUSE ELECTRIC SHOCK.

• CONNECT THE CONNECTING CABLE CORRECTLY. IF THE CONNECTING CABLE IS
CONNECTED BY WRONG WAY, ELECTRIC PARTS MAY BE DAMAGED.

• GROUNDING WIRE WORKS MUST BE CONSTRUCTED IN COMPLIANCE WITH INSTALLA­TION MANUAL.

• BE SURE TO USE THE CORD-CLAMPS AND THE UNIT COVER TO THE SPECIFIED
POSITIONS WITH ATTACHED TO THE PRODUCT. MOUNT THE UNIT COVER FOR CABLES
OF CONNECTING SECTION FIRMLY WITH THE SCREWS.

• DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OF GAS VAPORS.
FAILURE TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR EXPLOSION.

• IF A REFRIGERATION GAS LEAKS DURING INSTALLATION, BE SURE TO PERFORM
VENTILATION.

IF THE REFRIGERANT GAS COMES INTO CONTACT WITH FIRE, A POISONOUS GAS MA Y
OCCUR.

WHEN INSTALLING AN AIR CONDITIONER, DO NOT ALLOW AIR OR MOISTURE TO
REMAIN IN THE REFRIGERATION CYCLE. OTHERWISE, PRESSURE IN THE REFRIGERA­TION CYCLE MAY BECOME ABNORMALLY HIGH SO THAT A RUPTURE OR PERSONAL
INJURY MAY BE CAUSED.

WARNING

• Never modify this unit by removing an y of the safety guards of by-passing any of the safety
interlock switches.

• Do not install in a place which cannot bear the weight of the unit.
Personal injury and property damage can result if the unit falls.

• Before doing the electrical work, attach an approved cable to the power supply cord.
And make sure the equipment to be earthed.

• For installation, use the tools and piping materials exclusively manufactured f or R410A, and
install securely in compliance with this Installation Manual.

Pressure of the used HFC R410A refrigerant becomes higher approx. 1,6 times of that of the
conventional refrigerant. Therefore, if the exclusive piping materials are not used or incomplete
installation is carried out, it may cause a rupture or personal injury, as well water leak, electrical
shock, and a fire may be caused.

• When installing or moving the air conditioner, do not mix air and so on than the specified refrigerant
(R410A) in the refrigeration cycle. If air and so on is mix ed, the pressure in the refrigeration cycle may
become abnormally high so that personal injury may be caused by a rupture.

CAUTION

• Exposure of unit to water or other moisture before installation will result in an electrical short.
Do not store in a wet basement or expose to rain or water.

• After unpacking the unit, examine it carefully for possib le damage.

• Do not install in a place that can increase the vibration of the unit. Do not install in a place that
can amplify the noise level of the unit or where noise and discharged air might disturb user’ s
neighbors.

• T o a void personal injury, be careful when handling parts with sharp edges.

• Please read the installation manual carefully before installing the unit. It contains further
important instructions for proper installation.

• Never install a power capacitor f or po wer f actor improvement.

– 42 –

Indoor unit

Pipe
hole

65,5mm

120mm

Thread

Weight

1
Installation
plate

9

Mounting
screw

Pipe hole

65,5mm

40mm

Anchor bolt hole

66mm

9-2. Indoor Unit

Hanger

Hanger

Hanger

Pan head

5

wood screw

4

66 mm or more

Remote
control
holder

Batteries

3

Cover

120 mm or more

Front cabinet

Front panel

(Attach to the front cabinet.)

7

Deodorizing
filter

Before installing the wireless remote control

• With the remote control cover opened,
load the supplied batteries correctly,
observing their polarity.

Clip anchor
(local part)

Air filter

6

Purifying
filter

Wireless remote control

2

Wireless
remote
control

2

9-2-1. Accessor y and Installation Parts

Part

No.

1

Installation plate x 1

2

Wireless remote control x 1

Name of parts (Q'ty)

9

1

120 mm

or more

Mounting
screw

Part
No.

For the rear left and left piping

Installation
plate

Shield pipe
(local part)

6

7

Insert the something by fist-size between
the indoor unit and wall, and lift indoor
unit to make work easier.

Do not allow the drain hose to get slack.

Make sure to run the drain hose sloped
downward.

The auxiliary piping can be
connected the left, rear left, rear,
right or bottom.

Right

Rear

Bottom

Insulation of refrigerant pipes insulates the pipes
separately, not together.

Use 6-mm thick heat resisting polyethylene foam
(Inside of the ceiling).
Use 10-mm thick heat resisting polyethylene foam
outside of the room.

Name of parts (Q'ty)

Purifying filter x 1

Deodorizing filter x 1

Wall

Cut the piping hole
sloping slightly

Rear left

Left

9-2-2. Installation Place

• A place which provides the spaces around the
indoor unit as shown in the installation diagram.

• A place where there is no obstacle near the air
inlet and outlet.

• A place which allows an easy installation of the
piping to the outdoor unit.

• A place which allows the front panel to be
opened.

CAUTION

• Direct sunlight to wireless receiver of the
indoor unit should be avoided.

• The microprocessor in the indoor unit should
not be too close to r-f noise sources.

Remote Control

• A place where there are no obstacles such as a
curtain that may block the signal from the remote
control.

• Do not install the remote control in a place
exposed to direct sunlight or close to a heating
source, such as a stove.

• Keep the remote control at least 1 m apart from
the nearest TV set or stereo equipment.
(This is necessary to prevent image distur­bances or noise interference.)

• The location of the remote control should be
determined as shown below.

7m

9-2-3. Cutting a Hole and Mounting

Installation Plate

Cutting a Hole

The center of the piping slot

The center of the pipe
hole is above the arrow.

is above the arrow.

80mm

Pipe hole

65mm

Fig. 9-2-2

1. After determining the pipe hole position on the
mounting plate (80 mm

), drill the pipe hole
(ø65 mm) at a slight downward slant to the
outdoor side.

NOTE :

• When drilling the pipe hole in the wall that the a
metal lath, wire lath or metal plate covers
inside, be sure to use a pipe hole brim ring sold
separately .

• There may be a wire conduit embedded in
the wall. Check on the blueprint or ask the
builder whether it is done or not.

• Make sure of the proper installation of the
installation plate before mounting the indoor
unit.

Mounting the Installation Plate

For installation of the indoor unit, use the paper
pattern on the back.

40,5

mm

3

4

5

Battery x 2

Remote control holder x 1

Pan head wood screw Ø3,1x 16

x 6

B

Fig. 9-2-1

Fig. 9-2-3

8

B Label x 2

9

Mounting screw Ø4 x 25

10

x 2

Indoor unit Installation manual x 1

– 43 –

• When the installation plate is directly
mounted on the wall

1. Securely fit the installation plate onto the wall
by screwing it in the upper and lower parts to
hook up the indoor unit.

2. Install the installation plate using 4 to 6 pieces
of mounting screw securing four corners.

3. Install the installation plate horizontally in the
wall.

Anchor bolt

Projection
15mm or less

Fig. 9-2-4

• In the case of a reinforced concrete wall

1. In the selected area on the reinforced
concrete wall, bore holes at intervals of 450
mm, and drive clip anchors or hole in anchors
into them.

2. Attach the installation plate to the wall by
screwing bolts or nuts into the anchors.
However, in the case where hole in anchors
are used, the depth of the holes should be
adjusted so that the nut-heads extend no
more than 15 mm.

Hole in anchor Installation plate

Hole in anchor

Bolt

Installation

Concrete wall Concrete wall

plate

Nut with threaded
hole 8 mm dia.

Less than 15 mm

Fig. 9-2-5

• In the case of the BRICK wall

5 mm dia. hole

9 Mounting screw

Clip anchor
(local parts)

Fig. 9-2-6

CAUTION

When installing the installation plate with
mounting screw, do not use the anchor bolt
hole. Otherwise the unit may f all do wn and
result in personal injury and property damage.

9-2-4. Wiring Connection

How to connect the inter-connect cable

• After removing the front cabinet, remove the
terminal cover and the cord clamp.

• Connect and secure the inter-connect cable
and secure the cord clamp and the terminal
cover.

• Be sure to smooth out the notch with a file, etc.

CAUTION

• Be sure to refer the wiring system diagram
labeled inside the front panel.

• Check local electrical codes and also any
specific wiring instructions or limitation.

Terminal block

Cord

Terminal
Connecting
cable

about 15cm

Screw

cover

Screw

clamp

Screw

Fig. 9-2-7

Stripping length of connecting cable

123

10mm

40mm

NOTE :

Use stranded wire only .
WIRE TYPE: more than H05 RN-F

Fig. 9-2-8

1 2 3

NOTE :

Connect the earth line to the metallic part (
mark) located at the side of 3P terminal.

Fig. 9-2-9

10mm

Earth
line

50mm

Earth line

Connecting
cable

9-2-5. Piping and Drain Hose Installation

In case of rightward piping

• After scribing slits of the front cabinet and the
rear panel by a knife or a marking-off pin, cut
them by a pair of nippers or the like.

Slit
(front cabinet)

Slit (rear panel)

Fig. 9-2-10

In case of downward piping

• After scribing the slit of the front cabinet and
slit in the lower part of the rear panel by a knife
or a marking-off pin, cut them by a pair of
nippers or the like.

Slit
(front cabinet)

Slit

(rear panel)

Fig. 9-2-11

Left-hand connection with piping

Bend the connecting pipe so that it is laid within
43 mm above the wall surface. If the connecting
pipe is laid exceeding 43 mm above the w all
surface, the indoor unit may unstab ly be set on
the wall. When bending the connecting pipe,
make sure to use spring bender so as not to
crush the pipe.

Bend the connection pipe within a radius of
30 mm.

To connect pipe after installation of unit (figure)

(To the forefront of flare)

196mm

96mm

R 30mm (Use polisin or the like for bending pipe.)

43mm

Liquid side

Gas side

Outward form of indoor unit

80˚

Use the handle of screwdriver,etc.

Fig. 9-2-12

NOTE :

If the pipe is bent incorrectly , the indoor unit may
unstably be set on the wall.

After passing the connecting pipe through the
pipe hole, connect the connecting pipe to the
auxiliary pipes and wrap around them wirh the
facing tape.

CAUTION

• Bind the auxiliary pipes (two) and
connecting cable with facing tape tightly.
In case of leftward piping and rear-leftward
piping, bind the auxiliary pipes (two) only
with facing tape.

Indoor unit

Auxiliary
pipes

Installation
plate

Fig. 9-2-13

• Carefully arrange pipes so that any pipe
does not stick out of the rear plate of the
indoor unit.

• Carefully connect the auxiliary pipes and
connecting pipes to each other and cut off
the insulating tape wound on the
connecting pipe to avoid double-taping at
the joint, moreover, seal the joint with the
vinyl tape, etc.

• Since dewing results in a machine trouble,
make sure to insulate both the connecting
pipes.

(Use polyethylene foam as insulating
material.)

• When bending a pipe, carefully do it not to
crush it.

Connecting
cable

– 44 –

9-2-6. Drainage

1. Run the drain hose sloping downwards.

• Hole should be made at a slight downward
slant to the outdoor side.

Do not form the drain hose
into the waved shape.

Do not put the
drain hose end
into water.

Do not put the drain
hose end in the
drainage ditch.

50 mm
or more

Do not rise the
drain hose.

Fig. 9-2-14

2. Put water in the drain pan and make sure that
the water is drained outdoors.

3. When connecting extension drain hose,
insulate the connecting part of extension drain
hose with shield pipe.

Shield pipe (local parts)

Drain hose

Inside the room

Extension drain hose

Fig. 9-2-15

CAUTION

Arrange the drain pipe for proper drainage
from the unit.

Improper drainage may result in dew-dropping.

9-2-7. Indoor Unit Fixing

1. Pass the pipe through the hole in the wall,
and hook the indoor unit on the installation
plate at the upper hooks.

2. Swing the indoor unit to right and left to
confirm that it is firmly hooked up on the
installation plate.

3. While pressing the indoor unit onto the wall
by the lower part, hook it up on the
installation plate by the lower part. Pull the
indoor unit toward you b y the lower part to
confirm that it is firmly hooked up on the
installation plate.

9-2-8. Setting of Remote Control

Selector Switch

When two indoor units are installed in the
separated rooms, there is no need to change
the select switches.

Remote Control Selector Switch

• When two indoor units are installed in the
same room or adjacent two rooms, if
operating a unit, two units may receive the
remote control signal simultaneously and
operate. In this case , the operation can be
preserved by setting either one indoor unit
and remote control to B setting (Both are
set to A setting in factory shipment).

• The remote control signal is not received
when the settings of indoor unit and remote
control are different.

• There is no relation between A setting/B
setting and A room/B room when
connecting the piping and cables.

1. Setting of remote control switch at the
indoor unit side

• Remove the front panel.

(1) Before you open the front panel, be sure to

turn off the circuit breaker or the main power
switch.

(2) Open the screw caps and remove the two

screws securing the front cabinet.
(3) Close the screw caps.
(4) Open the vertical air flow louver horizontally

by hand.
(5) Slightly open the lower part of the front

cabinet then pull the upper part of the front

cabinet toward you to remov e it from the rear

panel.

How to remove the front cabinet

(5)

(5)

How to open the screw cap

Fig. 9-2-18

• Place your finger on the lower part and
push to open the screw cap.

• Remove the connector cover.

(1) Remove the screws securing the connector

cover.

• Remove the electrical parts cover.

(1) Remove the screws securing the electrical

parts cover.

• Change the remote control selector switch
to [B].

(1) Pull out P.C. board from the electrical parts

box up to the place where the remote control

selector switch can be observed.
(2) Change both switches.
(3) Return the P.C. board to original position.

• Mount the electrical parts cover and the
connector cover each with screws.

• Mount the front panel.

After fastening the two screws, one each at the
left and right of the air outlet, be sure to push
the upper center (1), right end (2), left end (3)
and the lower center part (4) of the air outlet,
and confirm that no gap is left between the
front panel and the rear plate.

• If cooling (dry) operation is made without
pushing the air outlet, dew can be deposited
on the front panel surface. In addition a gap
between the front panel and the rear plate
will become wider, spoiling the appearance.

• Adhesion of B label (When setting to [B])

Be sure to adhere the B label above the label
and on the remote control.

Screws

Screws

Connector cover

Electrical parts cover

Switch
(Selector switch)

P.C. board

Pull out

Fig. 9-2-19

• How to set the remote control selector
switch

A setting B setting

ON

1 2

Push Push

3

1

4

Push

ON

1 2

Push

2

2

Hook

Hook here

1

1

Installation
plate

Press

(un-hook)

Fig. 9-2-16

(2) (3)

Vertical air flow louver

(4) (2) (3)

Fig. 9-2-17

Color label

Fig. 9-2-20

8

B label

– 45 –

2. Setting of remote control selector at the
remote control side

[B] of the remote control is displayed with
liquid crystal only when it is set to [B].

There is no display of [A].

• Enter the battery.

• Push the [CHK] button by something with thin
edge. ([

] is displayed.)

• If [MODE] button is pushed while pushing
[CHK] button, the small [B] is displayed at the
right of the setting temperature indication
section.

T o reset to [A] setting, push the [MODE]

*

button again while pushing the [CHK]
button.

3. Confirm the indoor unit can operate with
the changed setting of the remote control.

MODE FANTEMP .

AUTO
COOL
DRY
FAN ONLY

AUTO

MODE

ON OFF RSV CNL

WC-E1BE

Hr.ON OFF TIMER

TEMP.

START/STOP

SET

ACL CHK

TIMER

AUTO
LOW

B

MED.

C

HIGH

FAN

ECONO.

B
C

CHK button
MODE button

Fig. 9-2-21

The above remote control is one for cooling

*

only model.

9-2-9. Check and Test Operation

¨ 1. Check the unit is firmly hooked up on the

installation plate.

¨ 2. Check the connecting pipes tightened

securely.
Confirm that there is no gas leakage.

¨ 3. Confirm that all connecting cables are

secured and correct.

¨ 4. Check the pipes insulation.
¨ 5. Check the drainage.
¨ 6. Connection of the grounding wire.
¨ 7. To switch the TEST R UN (COOL) mode,

turn the switch on.
T o switch the TEST RUN (COOL) mode,
press TEMPORAR Y b utton f or 10 sec.
(The beeper will make a short beep.)

TEMPORARY
button

TEMPORARY

Fig. 9-2-22

¨ 8. Operate the unit at cooling operation mode

for 15 minutes or more.
Measure the temperature of the intake and
discharge air. Ensure the diff erence
between the intake temperature and the
discharge one is more than 8°C.

NOTE:

Three-minutes protection feature
A protection feature prevents the air

conditioner from being activated for about
3 minutes when it is restarted immediately
after operation or when the power switch is
turned on.

¨ 9. Check the remote control operation.

When finished the check and test operation,
make sure to return to REMOTE CONTROL.
(Push the TEMPORARY button with once
again.)

¨ 10. Explain to the customer on the correct

usage of air conditioner with simple
layman’s terms.

9-3. Outdoor Unit

9-3-1. Accessory and Installation Parts

1

Owner's manual x 1

2

Outdoor unit
installation manual x 3

3

Specifications x 3

4

Drain nipple x 1
(Heat pump model only)

Required tools for installation work

1) Philips screw driver

2) Hole core drill (65 mm)

3) Spanner

4) Pipe cutter

5) Knife

6) Reamer

7) Gas leak detector

8) Tape measure

9) Thermometer

10) Mega-tester

11) Electro circuit tester

12) Hexagonal wrench (5 mm)

13) Flare tool

14) Pipe bender

15) Level vial

16) Metal saw

R410A (Special requirement)

17) Gauge manifold
(Charge hose : R410A special requirement)

18) Vacuum pump
(Charge hose : R410A special requirement)

19) Torque wrench
1/4 (17 mm) 16N•m (1,6 kgf•m)
3/8 (22 mm) 42N•m (4,2 kgf•m)
1/2 (26 mm) 55N•m (5,5 kgf•m)

20) Copper pipe gauge adjusting projection
margin

21) Vacuum pump adapter

SPECIFICATIONS

9-3-2. Refrigerant Piping

• Piping kit used for the conventional refrigerant
cannot be used.

• Use copper pipe with 0,8 mm or more
thickness.

• Flare nut and flare works

• Flare nut and flare works are also different
from those of the conventional refrigerant.

Take out the flare nut attached to the main unit
of the air conditioner, and use it.

9-3-3. Installation Place

• A place which provides the spaces around the
outdoor unit.

• A place where the operation noise and
discharged air do not disturb your neighbors.

• A place which is not exposed to a strong wind.

• A place which does not block a passage.

• When the outdoor unit is to be installed in an
elevated position, be sure to secure its f eet.

• There must be sufficient spaces for carrying
the unit into and out of the site.

• A place where the drain water does not raise
any problem.

CAUTION

1. Install the outdoor unit without anything
blocking the air discharging.

2. When the outdoor unit is installed in a
place exposed always to a strong wind like
a coast or on a high story of a building,
secure the normal fan operation using a
duct or a wind shield.

3. Specially in windy area, install the unit to
prevent the admission of wind.

Strong
wind

Fig. 9-3-1

4. Installation in the following places may
result in trouble. Do not install the unit in
such places.

• A place full of machine oil.

• A place full of sulfide gas.

• A place where high-frequency waves are
likely to be generated as from audio
equipment, welders, and medical
equipment.

– 46 –

9-3-4. Optional Installation Parts

(Local Supply)

Parts name

Refrigerant piping

A

Liquid side : ø6,35 mm
Gas side : ø9,52 mm or ø12,7 mm

Pipe insulating material

B

(polyethylene f oam, 6 mm thick)

C

Putty, PVC tapes

Q’ty

Each

one

Each

one

9-3-5. Optional Installation Parts

(Separate Sold)

Parts name

RB-M43RE Reducer (Ø12,7 → Ø9,52)
RB-M34EE Expander (Ø9,52 → Ø12,7)

9-3-6. Refrigerant Piping Connection

CAUTION

KEEP IMPORT ANT 4 POINTS FOR PIPING
WORK

1. T ak e a wa y dust and moisture .
(Inside of the connecting pipes)

2. Tight connection (between pipes and unit)

3. Evacuate the air in the connecting pipes
using VA CUUM PUMP.

4. Check gas leak. (connected points)

Flaring

1. Cut the pipe with a pipe cutter.

90˚

2. Insert a flare nut into the pipe, and flare the
pipe.

As the flaring sizes of R410A differ from those
of refrigerant R22, the flare tools newly
manufactured for R410A are recommended.
However , the
conventional tools can
be used by adjusting
projection margin of
the copper pipe.

Obliquity Roughness Warp

Fig. 9-3-2

Fig. 9-3-3

• Projection margin in flaring : B (Unit : mm)

Rigid (Clutch type)

Outer dia.

of copper

1

R410A tool used

R410A R22

pipe

0 ~ 0,5 (Same as left)

6,35

0 ~ 0,5 (Same as left)

9,52

0 ~ 0,5 (Same as left)

12,7

Conventional tool used

R410A R22

1,0 ~ 1,5 0,5 ~ 1,0
1,0 ~ 1,5 0,5 ~ 1,0
1,0 ~ 1,5 0,5 ~ 1,0

Imperial (Wing nut type)

Outer dia. of

copper pipe

6,35 1,5 ~ 2,0 1,0 ~ 1,5
9,52 1,5 ~ 2,0 1,0 ~ 1,5

12,7 2,0 ~ 2,5 1,5 ~ 2,0

R410A R22

Fixing bolt arrangement of outdoor unit

600

Suction side

115

310

76

Diffuser

Fig. 9-3-6

• Secure the outdoor unit with the fixing bolts
and nuts if the unit is likely to be exposed
to a strong wind.

• Use ø8 mm or ø10 mm anchor bolts and
nuts.

Drain hole

• Flaring size : A (Unit : mm)

+ 0

A

Outer dia. of

copper pipe

6,35 9,1 9,0
9,52 13,2 13,0

12,7 16,6 16,2

In the case of flaring for R410A

*

with the conventional flare tool,

R410A R22

– 0,4

pull out it approx. 0,5 mm more
than that for R22 to adjust to the
specified flare size.
The copper pipe gauge is
useful for adjusting projection
margin size.

Fig. 9-3-4

9-3-7. Installation

NOTE : For installation, at least 3 dimensions

Drainage

ø25

Bottom plate
Drain nipple

Fig. 9-3-7

• Install the provided drain nipple in the hole
of the bottom plate.

• Perf orm proper drainage processing using
a drain hose sold separately or one on the
market. (Inner diameter : 16 mm)

• Do not use an ordinary hose on the market,
because it tends to get flat and as a result,
it prevents water from draining.

Drain hose sold
separately or one
on the market.

should be kept free from obstacles (walls).

1. Piping connections to the outdoor unit should
be arranged in the sequence A, B, starting
from the bottom.

100mm or

more from wall

50mm or more

from wall

600mm or more

(For each piping connection, the gas pipe is
on the bottom and the liquid pipe is on the
top.)

2. When multiple indoor units are to be
connected to the outdoor unit, make the ends

250mm or

more from wall

B

200mm or more

of the pipes and wires from each indoor unit
to ensure that they will be connected to the
outdoor unit correctly .
(Problems caused by indoor units being
connected to the outdoor unit incorrectly are

• Total piping length : Two room Multi (A + B)
= 30 m or less

• Minimum piping length : A or B
= 2 m or more

• Maximum indoor piping length :
A or B = 20 m or less

• Maximum piping height difference :
A or B = 10 m or less

• Maximum piping / height difference

between two rooms = 10 m or less

A

10 m
or less

Outdoor

unit

B

Fig. 9-3-8

4. If the outdoor unit is to be mounred on a wall,
make sure that the platform supporting it is
sufficiently strong.

The platform should be designed and
manufactured to maintain its strength over a
long period of time, and sufficient consider­ation should be given to ensuring that the
outdoor unit will not fall.

5. When the outdoor unit is to be mounted high
on a wall, take particular care to ensure that
parts do not fall installer is protected.

6. When doing installation work on level ground,
it is usual to wiring and piping connections to
the indoor units. And/then make to the outdoor
unit.

However if outdoor work is difficult it is
possible instead to make changes to the
procedure.

For example by making adjustments to the
wiring and piping length on the inside (rather
than the outside).

How to remove the valve cover

1. Remove a screw of the valve cover.

2. Pull the valve cover downward.

very common in multiple-unit installations.)

As shown in the figure, hang power cord
and connecting cable downward, and
take out it along piping connection port.

Fig. 9-3-5

3. The length and height difference of the
connecting pipes between the indoor and
outdoor units must be within the ranges
indicated below.

Valve
cover

Fig. 9-3-9

Tightening connection

5mm

Connecting
cable

Power cord

Earth line Earth line

10

10

LN

30

10

30

40

10

40

123

Align the centers of the connecting pipes and
tighten the flare nut as far as possible with your
fingers. Then tighten the nut with a spanner and
torque wrench as shown in the figure.

CAUTION

• Do not apply excess torque. Otherwise ,
the nut may crack depending on the
conditions.

(Unit : N·m)

Outer dia. of copper pipe

ø6,35 mm
ø9,52 mm
ø12,7 mm

• Tightening torque of flare pipe connections

Pressure of R410A becomes higher than that
of R22. (Approx. 1,6 times) Therefore, using a
torque wrench, tighten firmly the flare pipe
connecting sections which connect the indoor
and outdoor units up to the specified
tightening torque. Incorrect connections ma y
cause not only a gas leakage,

– 47 –

but also a trouble of the refrigeration cycle.

Fig. 9-3-10

Never apply refrigerating machine oil to
the flare surface.

Half union

Externally
threaded side

Use a wrench to secure.

B

A

Outdoor unit

Fig. 9-3-11

Tightening torque

14 to 18 (1,4 to 1,8 kgf•m)
33 to 42 (3,3 to 4,2 kgf•m)
50 to 62 (5,0 to 6,2 kgf•m)

Flare at
indoor
unit side

Flare at
outdoor
unit side

Flare nut

Use a torque wrench to tighten.

ø6,35
ø9,52
ø6,35
ø9,52

Internally
threaded side

B UNIT

A UNIT

Indoor unit

9-3-8. Evacuating

After the piping has been connected to all indoor
unit(s), you can perform the air purge together at
once.

AIR PURGE

Evacuate the air in the connecting pipes and
in the indoor unit using vacuum pump.

Do not use the refrigerant in the outdoor unit.
For details, see the manual of vacuum pump.

Use a vacuum pump

Be sure to use a vacuum pump with counter-flow
prevention function so that inside oil of the pump
does not flow backward into pipes of the air
conditioner when the pump stops. (If inside oil of
the vacuum pump enters into the air conditioner
which adopts R410A, a trouble of the refrigeration
cycle may be caused.)

1. Connect the charge hose from the manifold
valve to the service port of the gas side
packed valv e.

2. Connect the charge hose to the port of
vacuum pump.

3. Open fully the low pressure side handle of the
gauge manifold valve.

4. Operate the vacuum pump to start for
evacuating.
Perform e vacuating f or about 15 min utes if the
total piping length is 30 meters. (15 minutes
for 30 meters) (assuming a pump capacity of
27 liters per minute.)
Then confirm that the pressure gauge reading
is –101 kPa ( –76 cmHg).

5. Close the low pressure side valve handle of
gauge manifold.

6. Open fully the valve stem of the packed
valves (both side of Gas and Liquid).

7. Remove the charging hose from the service
port.

8. Securely tighten the caps on the packed valves.

9. Execute above works from 1 to 8 on the each
connected indoor unit.

Compound pressure gauge

–101kPa (–76cmHg)

Handle Lo

Charge hose
(For R410A only)

Connecting
pipe

Service port
(Valve core (Setting pin))

Pressure gauge

Packed valve at liquid side
Packed valve at gas side

Fig. 9-3-12

Manifold valve

Handle Hi
(Keep full closed)

Charge hose
(For R410A only)

Vacuum pump adapter
for counter-flow prevention
(For R410A only)

Vacuum
pump

Packed valve handling precautions

• Open the valve stem all the way out; so not try
to open it beyond the stopper .

• Securely tighten the valve stem cap torque is
as follows :

Gas side

(ø12,7 mm)

Gas side

(ø9,52 mm)

Liquid side

(ø6,35 mm)

Service port

50 to 62 N•m

(5,0 to 6,2 kgf•m)

33 to 42 N•m

(3,3 to 4,2 kgf•m)

14 to 18 N•m

(1,4 to 1,8 kgf•m)

14 to 18 N•m

(1,4 to 1,8 kgf•m)

Hexagon wrench is required.

Fig. 9-3-13

9-3-9. Electrical Work

For the air conditioner that has no power cord,
connect a power cord to it as mentioned below.

Cord clampScrew

Maximum

running

current

8,5 A

Terminal block
(Connecting cable)

Connecting cable

(A unit)

Fig. 9-3-14

Fuse

rating

2,0mm

10A

(AWG-14)

or more

Connecting cable

(B unit)

Power

cord

Earth line

Power

source

220–230–240
Single phase

50 Hz

Terminal block
(Power supply)

Power cord

How to wiring connection

1. Connect the connecting cable to the terminal
as identified with their respective matched
numbers on the terminal block of indoor and
outdoor unit. (1,0 mm2 AWG 18 or more)

2. When connecting the connecting cable to the
outdoor unit terminal, prevent water coming in
the outdoor unit.

3. Insulate the unused cords (conductors) with
strip the sheath of connecting cable with PVC
tape.
Process them so that they do not touch any
electrical or metal parts.

4. For inter-unit wiring, do not use a cut wire
jointed to another on the way.
Use wires long enough to cover the entire
length.

CAUTION

• Wrong wiring connection may cause some
electrical parts burn out.

• Be sure to use the cord clamps specified
positions with attached to the product.

• Do not damage or scratch the conductive
core and inner insulator of power and inter­connecting cables when peeling them.

• Be sure to comply with local codes on
running the wire from outdoor unit to indoor
unit (size of wire and wiring method etc.)

• Use the power cord and Inter-connecting
cable with specified thickness, specified
type, and protective devices specified.

2

Stripping length power cord and
connecting cable

Fig. 9-3-15

– 48 –

9-3-10. Check and Test Operation

For R410A, use the leak detector exclusively
manufactured for HFC refrigerant (R410A,
R134a, etc.).

The conventional leak detector for HCFC

*

refrigerant (R22, etc.) cannot be used because
its sensitivity for HFC refrigerant lowers to
approx. 1/40.

• Pressure of R410A becomes approx. 1,6 times
of that of R22. If installation work was
incompletely finished, a gas leakage may
occur in the cases such as pressure rise
during operation. Theref ore, be sure to test the
piping connections for leaking.

Flare nut connections
(Indoor unit)

• Flare nut connections
(Outdoor unit)

• Valve stem cap connection

• Service port cap connection

Fig. 9-3-16

• Check the flare nut connections, valve stem
cap connections and service port cap
connections for gas leak with a leak detector or
soap water.

CAUTION

• Use a circuit breaker of a type that is not
tripped by shock waves.

• If incorrect/incomplete wiring is carried out,
it will cause an electrical fire or smoke.

• Prepare the power source for exclusive use
with the air conditioner.

• This product can be connected to the mains.

Connection to fixed wiring :
A switch or circuit breaker which
disconnects all poles and has a contact
separation of at least 3 mm must be
incorporate in the fixed wiring.
An approved short circuit breaker or
switches must be used.

(A breaker having a sensitivity of

*

approximately 0,1 second or less and
a capacity of approximately 30 mA is
usually used.)

9-3-11. MISWIRING (MISPIPING) CHECK

Make sure that the wiring and piping for each
room have the same alphabetical code (A, B, C).

Connect and secure the power cord.
Use the power cord / cables with thickness, type,

and protective devices specified in this manual.
Insulate the unused cords (conductors) with PVC

tape.

1. Turn on the electrical power breaker.

2. Operate the indoor unit with cooling mode.

3. Start the check.

• Run the indoor unit in A room, and confirm
cool air blows out.

• Confirm the indoor units in B, C rooms do
not run. (In this time, also check flowing
sound of refrigerant is not heard.)

• Stop operation of the indoor unit in A
room, and execute the same checks on
the indoor unit in B and C rooms.

9-3-12. Useful Functions

Self-Diagnosis by LED Indication

• For this outdoor unit, the self-diagnosis is
possible by using five LEDs (Red).

• Refer to the table in page 61, for more details.
LEDs (Red) (D11 to D15) locate on the sub-

*

control board underneath of the inverter.

1. If a trouble occurs, LED (Red) goes on
according to the contents of trouble as shown
in the left table.

2. When two or more troubles occur, LEDs go on
cyclically (alternately).

3. Usually, LEDs (Red) go off .

Wiring port

D11 D12 D13 D14 D15

LED (Red)

Fig. 9-3-17

9-3-13. Installation/Servicing Tools Changes in the product and components

In the case of an air conditioner using R410A, in order to prevent any other refrigerant from being
charged accidentally, to service port diameter of the outdoor unit control valve (3 way v alv e) has been
changed. (1/2 UNF 20 threads per inch)

• In order to increase the pressure resisting strength of the refrigerant piping flare processing diameter
and size of opposite side of flare nuts has been changed. (for copper pipes with nominal dimensions 1/
2 and 5/8)

New tools for R410A

New tools for R410A Applicable to R22 model

As pressure is high, it is impossible to measure by means of

Gauge manifold

Charge hose

Electronic balance
for refrigerant charging

Torque wrench
(nominal diam. 1/2, 5/8)

Flare tool
(clutch type)

Gauge for projection
adjustment

Vacuum pump adapter

Gas leakage detector

X

X

¡

X

¡

———

¡

X

conventional gauge. In order to prevent any other refrigerant from
being charged, each port diameter has been changed.

In order to increase pressure resisting strength, hose materials and
port size have been changed (to 1/2 UNF 20 threads per inch).
When purchasing a charge hose, be sure to confirm the port size.

As pressure is high and gasification speed is fast, it is difficult to
read the indicated value by means of charging cylinder, as air
bubbles occur.

The size of opposite sides of flare nuts have been increased.
Incidentally, a common wrench is used for nominal diameters 1/4
and 3/8.

By increasing the clamp bar’s receiving hole, strength of spring in
the tool has been improved.

Used when flare is made by using conventional flare tool.

Connected to conventional vacuum pump. It is necessary to use an
adapter to prevent vacuum pump oil from flowing back to the charge
hose. The charge hose connecting part has two ports-one for
conventional refrigerant (7/16 UNF 20 threads per inch) and one for
R410A. If the vacuum pump oil (mineral) mixes with R410A a
sludge may occur and damage the equipment.

Exclusive for HFC refrigerant.

• Incidentally, the “refrigerant cylinder” comes with the refrigerant designation (R410A) and protector
coating in the U. S’s ARI specified rose color (ARI color code: PMS 507).

• Also, the “charge port and packing for refrigerant cylinder” require 1/2 UNF 20 threads per inch
corresponding to the charge hose’s port size.

Changes

10. HOW TO DIAGNOSE THE TROUBLE

The pulse modulating circuits are mounted to both
indoor and outdoor units. Therefore, diagnose
troubles according to the trouble diagnosis proce­dure as described below. (Refer to the check points
in servicing written on the wiring diagrams attached
to the indoor/outdoor units.)

T able 10-1

No. Troubleshooting Procedure Page

1 First Confirmation 49
2 Primary Judgment 50
3 Judgment by Flashing LED of Indoor Unit 5 1

Self-Diagnosis by Service Check Remote

4

Control
5 Judgment of Trouble by ever y symptom 55
6 How to Check Simply the Main Parts 63

52

NOTE :

A large-capacity electrolytic capacitor is used in the
outdoor unit controller (inverter). Therefore, if the
power supply is turned off, charge (charging voltage
DC280V) remains and discharging takes a lot of
time. After turning off the pow er source, if touching
the charging section before discharging, an electri­cal shock may be caused. Discharge the electrolytic
capacitor completely by using soldering iron, etc.

< Discharging method >

(1) Remove the inverter cover (plating) b y opening

four mounting claws.

(2) As shown below, connect the discharge resis-

tance (approx. 100Ω40W) or plug of the solder­ing iron to voltage between + – terminals of the
C15 (“CAUTION HIGH VOLTAGE 320V” is
indicated.) electrolytic capacitor (500µF/400V)
on P.C. board, and then perf orm discharging.

10-1. First Confirmation

10-1-1. Confirmation of Power Supply

Confirm that the power breaker operates (ON)
normally .

Discharging position
(Discharging period
10 seconds or more)

Fig. 10-1

10-1-2. Confirmation of Power Voltage

Confirm that power voltage is AC 220–230–240 ±
10%. If power voltage is not in this range, the unit
may not operate normally.

Plug of
soldering iron

Inverter cover

P. C. board
(Soldered surface)

– 49 –

10-1-3. Operation Which is not a Trouble (Program Operation)

For controlling the air conditioner , the prog ram operations are built in the microcomputer as described in the
following table. If a claim is made for running operation, check whether or not it meets to the contents in the
following table . When it does, we inf orm you that it is not troub le of equipment, b ut it is indispensab le f or control­ling and maintaining of air conditioner.

T able 10-1-1

No.

1

When power breaker is turned “ON”, the
operation lamp (Green) of the indoor unit
flashes.

2

Compressor may not operate even if the
room temperature is within range of
compressor-ON.

3

In Dry and ECONO. mode, FAN (air flow)
display does not change ev en though FAN
(air flow select) button is operated.

4

Increasing of compressor motor speed
stops approx. 30 seconds after operation
started, and then compressor motor speed
increases again approx. 30 seconds after.

5

The set value of the remote control should
be below the room temperature.

Operation of air conditioner

Description

The OPERATION lamp of the indoor unit flashes when
power source is turned on. If [START/STOP] b utton is
operated once, flashing stops. (Flashes also in power
failure)

The compressor does not operate while compressor
restart delay timer (3-minutes timer) operates.
The same phenomenon is found after power source has
been turned on because 3-minutes timer operates.

The air flow indication is fixed to [AUTO].

For smooth operation of the compressor , the compressor
motor speed is restricted to Max. 28 rps for 1 minute , and
Max. 57 rps for 1 min ute to 3 min utes , respectiv ely after
the operation has started.

If the set value is above the room temperature , Cooling
operation is not performed. And check whether battery of
the remote control is consumed or not.

6

In AUT O mode , the operation mode is
changed.

7

In HEAT mode, the compressor motor
speed does not increase up to the maxi­mum speed or decreases before the
temperature arrives at the set tempera­ture.

8

Cool, Dry, or Heat oper ation cannot be
performed.

10-2. Primary Judgment

To diagnose the troubles, use the following methods.
(1) Judgment by flashing LED of indoor unit
(2) Self-diagnosis by service check remote control
(3) Judgment of trouble by e very symptom

After selecting Cool or Heat mode, select an operation
mode again if the compressor keeps stop status for 15
minutes.

The compressor motor speed may decrease by high-temp .
release control (Release protective operation b y temp .-up
of the indoor heat exchanger) or current release control.

When the unit in other room operates previously in differ­ent mode, Fan Only operation is performed because of
first-push priority control. (Cool operation and Dry opera­tion can be concurrently performed.)

Firstly use the method (1) for diagnosis. Then, use
the method (2) or (3) to diagnose the details of
troubles.

For any troub le occurred at the outdoor unit side ,
detailed diagnosis is possible by 5-serial LED on the
inverter P.C. board.

– 50 –

10-3. Judgment by Flashing LED of Indoor Unit

While the indoor unit monitors the operation status of the air conditioner, if the protectiv e circuit operates , the
contents of self-diagnosis are displayed with bloc k on the indoor unit indication section.

T able 10-3-1

Indoor

indication

lamp flashes.

Which lamp

does flash?

Item

A

B

C

*

D

*

Check

code

OPERATION
ECONO.
TIMER
FAN-ONLY

OPERATION
ECONO.
TIMER
FAN-ONLY

OPERATION
ECONO.
TIMER
FAN-ONLY

OPERATION
ECONO.
TIMER
FAN-ONLY

Block display Description for self-diagnosis

OPERATION (Green)
Flashing display (1 Hz)

OPERATION (Green)
Flashing display (5 Hz)

OPERATION (Green)
TIMER (Yellow)
Flashing display (5 Hz)

OPERATION (Green)
FAN ONLY (Orange)
Flashing display (5 Hz)

Power failure (when power is ON)

Protective circuit operation for
indoor P.C. board

Protective circuit operation for
connecting cable and serial signal
system

Protective circuit operation for
outdoor P.C. board

OPERATION

E

*

ECONO.
TIMER
FAN-ONLY

OPERATION (Green)
TIMER (Yellow)
FAN ONLY (Orange)
Flashing display (5 Hz)

Protective circuit operation for others
(including compressor)

*If there is any trouble on the outdoor unit side, the details can be confirmed b y 5-serial LED

on the outdoor P.C. board.

NOTES :

(1) The contents of items B and C and a part of item E are displayed when air conditioner operates.
(2) When item B and C, and item B and a part of item E occur concurrently , priority is given to the b lock of item B .
(3) The check codes can be confirmed on the remote control for servicing.
(4) When connecting the changing kit, first-push priority control is executed. The secondary operation lamp

continues flashing. F or details , ref er the section 10. Changing Kit.

– 51 –

10-4. Self-Diagnosis by Remote Control (Check Code)

(1) The self-diagnosis by the check code is performed while items B to E bloc ks are displayed.
(2) When turning the operation mode on the remote control to the service mode, and operating the remote

control, the controller of the indoor unit can self-diagnose operation of the protection circuit by display ed
contents (check code) on the remote control, by whether all the lamps flash (5Hz) and the receiving sound
(Pi, Pi, Pi ... for 10 seconds) is heard. The timer lamp usually flashes (5Hz) during self-diagnosis .

10-4-1. Self-Diagnosis

Push the CHK button by something with thin edge.

1

• Check is displayed in the indication
part of the remote control.

Push toward the remote control one by one.
If it is normal, the receiving sound “Pi” is heard
every pushing it and check code in the indication
part of the remote control changes.

The timer lamp of the air conditioner flashes.
(5 times for 1 second)

• Check all of 35 check codes ( to ).

• Push to return to the objective code if passed.

MODE

AUTO

COOL

DRY

FAN ONLY

TEMP.

B

˚C

Hr.ON OFF TIMER

TEMP.

START/STOP

FAN

AUTO
LOW
MED.
HIGH

ACL

CHK

TIMER

E

2

AUTO

MODE

ACL

SET

CHK

FAN

ECONO.

If a trouble occurs, the receiving sound “Pi”
changes to Pi, Pi, Pi (continues for approx.
10 seconds).

TIMER

ON OFF

RSV CNL

Check the check code in the indication part
of the remote control.

• 2-digits alphanumeric characters are displayed in the
indication part of the remote control.

• All the lamps of the air conditioner flash
(5 times for 1 second).

Alphanumeric characters are
used for the check codes.

is 5. is 6.
is A. is B.
is C. is D.

To release the self-diagnosis function, push

3

button.

• Display returns to one before check.

START/STOP

Fig. 10-4-1

10-4-2. Operation Control by Rated Frequency in Service Mode

In the service mode, pushing “ON” or “OFF” operates the air conditioner by rated frequency of COOL or HEAT
mode for 30 minutes. (Cooling function operates under condition of room temperature by 24°C or more while
heating function by 23°C or less, respectively.)

– 52 –

10-4-3. Caution at Servicing

(1) After servicing, push the ST ART/STOP button to return to the normal mode.
(2) After servicing by the check code, turn off breaker of the power supply, and turn on breaker of the power

supply again so that memory in the microcomputer returns the initial status. Howe ver, the check codes are
not deleted even if the po wer supply is turned off because they are stored in the fix ed memory.

(3) After servicing, reset the check code by sending [ ] to the indoor unit in the service mode.

Then, the non-volatile memory is reset.

T able 10-4-1

Block distinction

Check

code

Block

Indoor P.C.
board etc.

Not
displayed

Connecting
cable and
serial signal

Check

code

Operation of diagnosis function

Cause of operation

Short-circuit or discon­nection of the room
temperature sensor
(TA sensor).

Being out of place,
disconnection, short­circuit, or migration of
heat exchanger sensor
(TC sensor)

Lock of indoor fan or
trouble on the indoor fan
circuit

Trouble on other indoor
P.C. boards

Return serial signal is not
sent to indoor side from
operation started.
(1) Defective wiring of

connecting cable

(2) Operation of compres-

sor thermo.
Gas shortage
Gas leak

Air

conditioner

status

Operation
continues.

Operation
continues.

All off

Operation
continues.

Operation
continues.

Remarks

Displayed when
error is detected.

Displayed when
error is detected.

Displayed when
error is detected.

Displayed when
error is detected.

Flashes when
trouble is detected
on Return serial
signal, and normal
status when signal
is reset.

Judgment and action

1. Check the room temp. sensor.

2. When the room temp. sensor is
normal, check P.C. board.

1. Check heat exchanger sensor.

2. When heat exchanger sensor is
normal, check P.C. board.

1. Check P.C. board.

2. When P.C. board is normal, check
the motor.

Replace P.C. board.

1. When the outdoor unit never
operate:

(1) Check connecting cable, and

correct if defective wiring.

(2) Check 25A fuse of inverter P.C.

board.

(3) Check 3,15A of inverter P.C.

board.

2. To display [Other] block during
operation, check compressor
thermo. operation and supply gas
(check gas leak also).

3. Unit operates normally during
check.
If Return serial signal does not
stop between indoor terminal
board 2 and 3, replace inverter
P.C. board.
If signal stops between indoor
terminal board 2 and 3, replace
indoor P.C. board.

Operation command
signal is not sent to
outdoor side.

Operation
continues.

– 53 –

Flashes when
trouble is detected
on Operation
command signal,
and normal status
when signal is
reset.

If Operation command signal does
not stop between indoor terminal
board 2 and 3, replace inverter P.C.

Check

code

Block

Outdoor P.C.
board

Not
displayed

Outdoor P.C.
board

Others
(including
compressor)

Check

code

∗

∗

Operation of diagnosis functionBlock distinction

Cause of operation

Inverter over-current
protective circuit operates.
(Short time)

Position-detect circuit
error or short-circuit
between windings of
compressor

Current-detect circuit
error

Being out of place,
disconnection or short­circuit of outdoor temp.
sensor

Disconnection or short­circuit of exhaust temp.
sensor

Outdoor fan drive system
error

Outdoor heat exchanger
temp. sensor error

Compressor drive output
error, Compressor error
(lock, missing, etc.),
Break down

Error exclusive for
multiple type

Return serial signal has
been sent when operation
started, but it is not sent
from halfway.
(1) Compressor thermo.

operation
Gas shortage
Gas leak

(2) Instantaneous power

failure

Compressor does not
rotate. (Current protective
circuit does not operate
when a specified time
passed after compressor
had been activated.)

Discharge temp.
exceeded 120°C.

Break down of
compressor

Four-way valve inverse
error (TC sensor value
lowered during heating
operation.)

Air

conditioner

status

All off

All off

All off

All off

All off

All off

Operation
continues.

All off

All off

Operation
continues.

All off

All off

All off

Operation
continues.

Remarkes

Displayed when
error is detected.

Displayed when
error is detected.

Displayed when
error is detected.

Displayed when
error is detected.

Displayed when
error is detected.

Displayed when
error is detected.

——

Displayed when
error is detected.

Displayed when
error is detected.

Flashes when
trouble is detected
on Return serial
signal, and normal
status when signal
is reset.

Displayed when
error is detected.

Displayed when
error is detected.

Displayed when
error is detected.

——

Judgment and action

Even if trying operation again, all
operations stop immediately. :
Replace P.C. board.

1. Even if connecting lead wire of
compressor is removed, position­detect circuit error occurred. :
Replace P.C. board.

2. Measure resistance between wires
of compressor, and perform short­circuit. : Replace compressor.

Even if trying operation again, all
operations stop immediately. : Replace
P.C. board.

Check 5-serial LED.

1. Check outdoor temp. sensors
(TE, TS).

2. Check P.C. board.

1. Check discharge temp. sensor
(TD).

2. Check P.C. board.

Position-detect error, over-current
protective operation of outdoor fan
drive system, fan lock, etc. : Replace
P.C. board or fan motor.

1. Check outdoor heat exchanger
temp. sensor (TE).

2. Check P.C. board.

Check 5-serial LED.
When 20 seconds passed after start­up, position-detect circuit error
occurred. : Replace compressor.

Check 5-serial LED.

1. Miswiring of connecting wire of A/
B rooms in indoor/outdoor units

2. Check gas leakage.

3. Check disconnection of sensor.

4. Electronic control valve error

1. Repeat Start and Stop with inter val
of approx. 10 to 40 minutes. (Code
is not displayed during operation.)
Supply gas. (Check also gas leak).

2. Unit operates normally during
check.
If Return serial signal does not
stop between indoor terminal block
2 and 3, replace inverter P.C.
board.
If signal stops between indoor
terminal block 2 and 3, replace
indoor P.C. board.

1. Trouble on compressor

2. Trouble on wiring of compressor
(Missed phase)

1. Check dischage temp. sensor (TD).

2. Degassing

3. Trouble on P.M.V.

1. Check power voltage.
(220–230–240 V ±10%)

2. Overload operation of refrigeration
cycle
Check installation condition
(Short-circuit of outdoor diffuser).

1. Check four-valve operation.

For 1C and 1E marked with ∗, refer to the column in page 60.

– 54 –

10-5. Judgment of Trouble by Every Symptom

10-5-1. Indoor Unit (Including Remote Control)

(1) Power is not turned on (Does not operate entirely)

Operation

Check Item

Is fuse of indoor control

board blown? (F01)

Is temp. fuse blown?

Is voltage indicated

NO

on rear of indoor control

board (DC12V or 5V)

Is DC310 to 340V

applied to primary

side of SW trans.

(T01) applied?

Turn off the power supply
once, and turn on it again
after 5 seconds passed.

NO

normal?

NO

Does the operation

lamp flash?

Is the power supply

turned on by pressing

[START/STOP] button

on remote control?

YES

NO

YES

NO

To item of Pre-check or
trouble before power board

YES

YES

Parts (R21, R109, SG01,

C15, C01, DB01, C02,

IC01, T01) are defective.

Connection of connecting

wire is defective.

YES

Does send display

of remote control flash

normally, and is the signal

sent securely?

(No trouble)

YES

Microcomputer

NONO

is defective.

Considerable main cause

Measures

Item by symptom

Remote control error

Refer to the item
of Remote control
check. (p.68)

Replace temp.
fuse set.
Check connecting
wire.

Replace main
board.

Is DC35V,

DC12V, DC7V

applied to secondary

side of SW trans.

(T01) applied?

YES

Turn "OFF" breaker

NO

once, and "ON"
again after removing
motor.

Is DC35V,

DC12V, DC7V

applied to secondary

side of SW trans.

(T01) applied?

YES

SW trans.,

IC (IC01) for

power supply, ]

or fan motor

Motor is defective.

• Be sure to disconnect the motor connector CN10 after shut off the power supply, or it will be a cause of
damage of the motor.

(2) Power is not turned on though Indoor P.C. board is replaced

<Confirmation procedure>

Turn on power supply.

Does operation lamp flash?

NO NO

YES YES

Is wired correctly to white and black

lead wires of terminal block?

Correct wiring.

To item of "Power supply
is not turned on".

– 55 –

(3) Only the indoor fan does not operate

Operation

Turn off the
power supply.

Turn on the
power supply.

Does the fan

stop in no operating

status?

YES

Start the operation
with low fan setting
in cool operation.

Does the fan rotate?

YES

NO

NO

Control board is defective.

Is the DC 35V

measured between

1

(red lead wire) and

2

(black lead wire)

of the motor connector

(CN10) ?

YES

NO

Check Item

Considerable main cause

Measures

Item by symptom

Replace the board.

Turn off the power supply,
and turn it on after
removing the motor from
the board.

Change the setting of
cooling to high fan.

Does the fan speed

become higher?

YES

Turn off the power supply.

Does the cross

flow fan rotate

normally?

YES

Turn on the power supply.

NO

Operation
stops

Is the rotation signal

(DC+5V 0V) output between

4 (blue lead wire) and

®

¬

lead wire) of the motor connector

(CN10) when rotating the cross

flow fan by hand in no operating

status ? (2 pulses/one turn)

YES

NO

2

(black

Repair the
bearing of the
cross flow fan.

Is the voltage of

DC35V measured

between 1 and 2 GND of

the motor connector

(CN10) ?

NO

YES

NO

Replace
the board.

Normal

Replace the
control board.

Replace the
fan motor.

– 56 –

(4) Indoor fan motor starts rotating by turning on power supply alone

(Operation may be normally performed (selected) b y operation on the remote contr ol.)

<Cause>

IC is built in the indoor fan motor, therefore P.C. board is also mounted to inside of the motor.
If soldering of P.C. board in the motor is def ective or IC is defective, the fan motor may rotate by only inputting

the power (turning on power supply).

<Confirmation procedure>

(1) Remove the front panel.(Remov e 2 scre ws and clicks.)
(2) Remove cov er of the fan motor lead wire. (1 clic k)
(3) Check the voltage (DC) using CN10 connector while the fan rotates.

NOTE :

• Do not disconnect the connector while the fan rotates.

• Use a thin tester rod.

Indoor fan starts rotating when power supply breaker is turned "ON".

(Check output voltage (DC) of the fan motor on P.C. board.)

Measure the voltage of the motor connector

CN10 pin 2 (GND : Black) and pin 3 (V line : Yellow)

under condition that the indoor fan rotates.

Above DC 0.4V

P.C. board is defective.

Below DC 0.4V

Motor is defective.

Yellow

Black

DC

P.C. board

CN10

5
4 Blue
3 Yellow
2 Black
1 Red

– 57 –

(5) How to examine whether remote control is good or bad

• Does setting (A/B) of the remote control selection match with that at indoor unit?

Operation

Check Items

Considerable main cause

Measures

Item by symptom

Is there direct
sunlight on the
receptor of the
air conditioner?

YES

NO

Is there any

thyristor

fluorescent light

near by?

YES

NO

Push the START/STOP button.

Does the transmission

indicator of remote

control light?

YES

<Cooling only
model>

Is operation

NO

possible when the

transmitter is moved

nearer to the infrared

signal receiver of the

air conditioner?

YES

Battery life

There is no beep from
the indoor unit.
The operation lamp of
the air conditioner main
unit does not light.

NO

Short-circuit ACL
switch with a coin or
others at rear side
of remote control.

<Heat pump
model>

Take out the batteries
and insert them again.
(rear side of remote
control)

Avoid direct
sunlight.

NO

Keep the air

conditioner away

from thyristor

fluorescent light.

Is Temporary Cool

operation possible when

keeping the temporary

switch of the air conditioner

main unit pressed for

10 seconds or more?

YES

Can any signal tone

be heard in a transistor

radio when transmitting

within 5cm distance

from the radio?

YES

Replace

P.C. board.

NO

NO

Replace the
battery.

Push the START/
STOP button

Does the transmission

indicator light?

YES

Is there any receiving

sound and operation?

YES

Normal

NO

Remote

control

is failure.

– 58 –

10-5-2. Wiring Failure (Interconnecting and Serial Signal Wire)

(1) Outdoor unit does not operate

1) Is the voltage between  and  of the indoor terminal block varied?
Confirm that transmission from indoor to outdoor is correctly performed based upon the following dia-

gram.

NOTE:

• Measurement should be performed 2 minutes and 30 seconds after starting of the operation.

• Be sure to prepare a diode for judgment.

Terminal block at indoor side

Red

White

Normal time : Voltage swings between DC15 and 60V.
Abnormal time : Voltage does not vary .

3
2

Terminal block

1

S5277G

S5277G or equivalent (G or J type)
(Diode with rated voltage of 400V
or more is acceptable.)

Tester

Fig. 10-5-1

(2) Outdoor unit stops in a little while after operation started

<Check procedure> Select phenomena described below.

(1) The outdoor unit stops 10 to 20 minutes after operation started, and 10 minutes or more are required to

restart the unit.

Gas circulation amount is down.

Measure gas pressure.

Thermo. operation of compressor

Gas shortage
Gas leak
Pipe clogging

(2) If the unit stops once, it does not operate until the power will be turned on again.

To item of Compressor does not operate.

(3) The outdoor unit stops 10 minutes to 1 hour after operation started, and an alarm is displayed.

(Discharge temp. error check code 03, 1E Sensor temp. error check code 02, 1C)

Gas leak
P.M.V. is defective.
Miswiring of connecting wires of indoor/outdoor units
Clogging of pipe and coming-off of TG, TC sensors

Refer to the chart in 11-6.

– 59 –

10-6.

Check Code 1C (Miswiring in indoor/outdoor units, disconnection of TGa sensor) and 1E

<Check procedure>

1C 1C 1E

Disconnection of
TGa sensor,
P.M.V. sensor error
(Check code 02, 1C)

Miswiring in indoor/outdoor
units, gas leakage,
disconnection of TS/TC
sensors (Check code 02, 1C)

Discharge temp. error,
gas leakage
(Check code 03, 1E)

Operation

Check Item

Is there miswiring of

connecting cable in A/B rooms

of indoor/outdoor rooms?

YES

Replace cables in A/B rooms
of outdoor terminal block.

Valve drive check

Is coil of the pulse modulation valve

(P.M.V.) correctly set?

YES

Is connector of coil connected to inverter?

Are connections of A/B rooms correct?

YES

Is positioning sound of valve (sound hitting to stopper) heard from valve
when the air conditioner starts the operation after turning off power of the
air conditioner once?
NOTE :
After all the operations stopped by the remote control, the power keeps
being supplied to outdoor unit for approx. 3 minutes. If operating the air
conditioner by remote control again just after all the operations stopped by the
remote control, positioning of the valve is not performed when outdoor unit is
activated because supplying power to the outdoor unit is not interrupted.
After positioning of the valve, activate the compressor and the outdoor fan.
It takes approx. 7 seconds for positioning of the valve, and sound ticktack
(hitting sound to stopper) is heard for approx. 0.5 seconds at least of that
period. As the sound is low, check sound by using screwdriver, etc.

YES

NO

NO

NO

NO

Considerable main cause

Measures

Item by symptom

Set it correctly.

Set it correctly.

Replace coil valve.

Are temp. sensors of indoor/outdoor units correctly set to the holder?
NOTE :
The temperature sensors which are used to control electronic control
valve include indoor heat exchanger sensor (TC), A room gas side temp.
sensor (TGa), and outdoor suction temp. sensor (TS).

YES

Gas amount check and valve clogging check
Check them when operation is performed in only one of A or B room.

Remove TC sensor connector from the P.C. board in indoor unit.(Remove connector from the P.C. board.)
Operate the air conditioner in COOL mode by TEMP button (“Pi” sound is heard if keeping pushed for 10 seconds.).
The operation enters temporary operation mode which fixes opening degree of P.M.V. and No. of revolution of
compressor. Check condensation at outlet of P.M.V., and then check operating pressure from the service port.

Existence of condensation at outlet of P.M.V.

If there is condensation at outlet (1/4 inch=Ø6,35mm valve side),

the valve is clogged.

Check the operating pressure from service port, and add gas if pressure is low.

NO

YES

– 60 –

Set it correctly.

Replace valve.

Add gas.

10-7. Trouble Diagnosis by Outdoor LED

For the outdoor unit, the self-diagnosis is possible by
five LEDs (Red).

• LEDs (Red) (D11 to D15) are provided on the
sub-control board under surface of the inv erter ,
and as shown below , the y are chec k ed from the
wiring port when removing the wiring cover.

(1) If a trouble occurs, LED (Red) goes on accord-

ing to the trouble as described in the table below.

(2) When two or more troubles occur, LEDs go on

cyclically.

(3) Usually, LEDs (Red) go off.

Wiring port

D11 D12 D13 D14 D15

Fig. 10-7-1

: LED ON, l : LED OFF P.M.V. : Pulse modulating valve

¤

LED (Red)

*

LED display

D11 D12 D13 D14 D15

lllll

llll

¤

l

¤¤

ll

¤

ll
l

lll

¤

lll

¤

l

¤¤
¤¤

¤¤

¤¤¤

lll

*

2, 3

*
*1

3

1

l

¤

¤

¤¤¤¤

l

¤¤

¤¤¤l ¤

ll

l

l
ll
ll

l

¤

ll

l
l

¤

Indoor

check

code

None

07
14

16
17
18
18
19
1A

1B
1C
1C

––

––

Description

During normal operation
Compressor thermo. operation, instantaneous power failure, gas

leak
IGBT short circuit, compressor motor rear shor t
Position-detect circuit error
Current-detect circuit error
Outdoor heat exchanger temp. sensor (TE) error
Suction temp. sensor (TS) error
Discharge temp. sensor (TD) error
Outdoor fan error
Outside temp. sensor (TO) error
Compressor system error
A room gas side temp. sensor (TGa) error
Gas leakage, TS sensor disconnection, P.M.V. sensor error
Indoor heat exchanger sensor (TC) disconnection, P.M.V. sensor

error

*

lll

3

*

2, 3

*

3

ll

¤
¤¤

ll

¤

l

¤

¤¤

1 Back-up operation is performed without block displa y of the indoor unit.

*

2 Operated normally when the air conditioner is driven in one room only. If operating in two rooms, b loc k-

*

display is performed (Instant and after approx. 30 minutes passed), the operation stops.

3 Refer to measures when indoor check code is “1C”.

*

l

l
l

¤¤
¤¤

¤¤

l

¤

l

¤

l

¤

1C
1C

1C
1D

1E

1F

Indoor/outdoor miswiring, gas leakage, TS/TC sensor
disconnection, P.M.V. sensor error

TGa sensor disconnection, P.M.V. sensor error
Communication error between MCU
Compressor lock
Discharge temp. error, gas leakage
Compressor break down

– 61 –

10-8. How to Diagnose Trouble in Outdoor Unit

10-8-1. Summarized Inner Diagnosis of Inverter Assembly

Diagnosis/Process flowchar t Item

Preparation

Remove
connector of
compressor.

Check 25A fuse

(Part No.F01).

OK

Check

15A fuse

(Part No.F03).

OK

NG

Replace fuse.

capacitor, diode

NG

Replace control
board assembly.

Check

electrolytic

block, etc.

Check

Check

Contents

Turn “OFF” the power breaker,
and remove 3P connector
which connects inverter and
compressor.

• Check whether 25A fuse on
the control board assembly
is blown or not. (F01)

Check whether 15A fuse on
the control board assembly
is blown or not. (F03)

• 15A fuse (F03) on the
control board is provided for
power factor improvement
control circuit. The operation
continues even if fuse is
blown.

Summary

If fuse was blown, be sure to
check the electrolytic
capacitor and diode block.
(DB01)

• Connect discharge
resistance (approx.
100Ω40W) or soldering
iron (plug) between +, –
terminals of the electro­lytic capacitor (500µF) of
C15 (with printed CAU­TION HIGH VOLTAGE) on
P.C. board.

Discharging position
(Discharging period
10 seconds or more)

Plug of
soldering
iron

Check

terminal voltage

of electrolytic

capacitor.

OK

Does outdoor

fan rotate?

YES

Does LED on control
board flash or go on?

CN300 of outdoor fan

NG

tester, check resistance

value between every

phases at motor side.

Replace
outdoor
fan motor.

NG

Check

electrolytic

capacitor, diode

block, etc.

NO

NO

Remove connector

motor, and using a

OK

YES

CBA

Operation

Measurement

Check

Stop

Check

Measurement

Turn on power breaker, and
operate the air conditioner in
COOL mode by short-circuit of
the timer.
Measure terminal voltage of
the electrolytic capacity.

500µF:400WV x 4
After operation, turn off the

power breaker after 2 minutes
20 seconds passed, and
discharge the electrolytic
capacity by soldering iron.
Check voltage between motor
phases.

• Is not winding between

, -

, or - opened



-

or short-circuited?

• Is not frame grounded with
, or ?

, 

If 15A fuse is blown,
discharge both edges of
the electrolytic capacitor
with soldering iron.

OK if 500µF

→→

→ DC140V

→→

Remove CN300 while
pushing the part indicated
by an arrow because CN01
is a connector with lock.

→→

→ Resistance between

→→

phases should be approx. 55
to 77Ω.

→→

→ Should be 10MΩ or more.

→→

– 62 –

Diagnosis/Process flowchar t Item

Contents

Summary

fan motor

NG

Replace
outdoor
fan
motor.

Check

compressor

winding

resistance.

OK

Replace

control board.

CBA

Check

winding of

compressor.

OK

Check

position

detect
signal.

OK

Replace control
board assembly.

NG

Replace

compressor.

NG

Replace
com­pressor.

Check

Operation

Check

Check winding resistance
between phases of compres­sor, and resistance between
outdoor frames by using a
tester.

• Is not grounded.

• Is not shor t-circuited
between windings.

• Winding is not opened.

Remove connector CN300 of
the outdoor fan motor, turn
on the power breaker, and
perform the operation.
(Stops though activation is
prompted.)
Check operation within 2
minutes 20 seconds after
activation stopped.

<Output check of fan motor
position detect signal>

While connecting connector
5P (CN301) for position
detection, using a tester,
measure voltage between

- . Between  -  : 5V



→→

→ OK if 10MΩ or more

→→



→→

→ OK if 0,51Ω → 0,57Ω

→→



(Check by a digital tester.)



a)One or two of three

voltages should be 5V,
and others should be 0V.
(When all are 0V or 5V, it
is not accepted.)

b)When rotating the fan

slowly with hands, the
voltage between pins
should move from 0V to
5V.
(Check it with an analog
tester.)

10-9. How to Check Simply the Main

Parts

10-9-1. How to Check the P.C. Board

(Indoor Unit)

(1) Operating precautions

1) When removing the front panel or the P.C.
board, be sure to shut off the power supply
breaker .

2) When removing the P.C. board, hold the edge
of the P.C. board and do not apply force to the
parts.

3) When connecting or disconnecting the
connectors on the P.C. board, hold the whole
housing. Do not pull at the lead wire .

(2) Inspection procedures

1) When a P.C. board is judged to be defective,
check for disconnection, b urning, or discol­oration of the copper foil pattern or this P.C.
board.

2) The P.C. board consists of the following 2
parts

a. Main P .C. board part:

DC power supply circuit (5V, 12V, 35V),
Indoor fan motor control circuit, CPU and
peripheral circuits, buzzer , and Driving
circuit of top/bottom louvers

b. Indication unit of infrared ray receiving

Infrared ray receiving circuit, LED:

To check defect of the P.C. board, f ollo w
the procedure described below.

– 63 –

(3) Check procedures

T able 10-9-1

No.

1

Shut off the power supply and
remove the P.C. board assembly
from the electronic parts base.

Remove the connecting cable from
the terminal block.

2

Remove the connector for the
motor, and turn the power on.

If the OPERATION lamp flashes
(0,5 sec. :ON, 0,5 sec. :OFF) when
the power turning on, the checking
points described as 1-5 of right
column are not necessary to
perform.

3

Make the operation status by
pushing once the START/STOP
button, except the status of [FAN
ONLY], [ON TIMER].

Procedure

Check point (Symptom)

1.Is the fuse blown?

Voltage check

1.Between TP1 and TP2
(220–230–240V AC)

2.Between TP2 and pin 1 of CN04
(220–230–240V AC)

3.Between TP2 and pin 3 of CN04
(220–230–240V AC)

4.Between + and – of C02
(310 ~ 340V DC)

5.Between 35V and GND

6.Between 12V and GND

7.Between 5 V and GND

Voltage check

1. Voltage of relay coil. (DC 12V)
Between pin 10 of IC31 and GND
Between pin 11 of IC31 and GND

2. Between No. 1 and 2 of connecting
cable terminal block.

(220–230–240V AC)

Causes

1.* Application of shock voltage.
* Overload by short-circuit of the

parts.

1.* AC power cord is defective.
* Poor contact of the terminal plate.
* Miss wiring of the power relay.

2.Fuse is defective.

3.Operation of the thermal fuse.

4.* Capacitor (C01, C15) is defective.
* Line filter (L01) is defective.
* Resistor (R01) is defective.
* Diode (DB01) is defective.

5.IC01, IC02, T01 are defective.

6.IC01, IC02, T01, F03 are defective.

7.IC01, IC02, T01, F02, Q29, IC03
are defective.

1.Breaking wire of the relay coil,
defective relay dr iver. (IC31)

2.Poor contact of relay.

4

Start the operation with the system
which the time of the restart delay
timer is shortened.

5

Make the operation status by pressing
once the START/STOP button.

1.The time of the restart delay timer
is shortened.

2.Cool operation

3.Air volume [AUTO]

4. Make the setting temperature lower
enough than room temperature.

5.Continuous operation.

Turn the power on after connecting

6

the motor connector.
Start the operation with the following

condition.

1.Operation [Cooling]

2.Airflow [High fan]

3.Continuous operation

1.All indicators light for 3 sec.

2. Indicators do not indicate nor mally
after approximate 3 sec.

1.Compressor does not operate.

2. OPERATION lamp flashes.

1.The voltage of DC 35V is not
measured between the red and
black of the motor terminals.

2. Motor does not rotate.
(The key operation is accepted.)

3. The motor rotates, but it vibrates too
much.



Defective indicator, or poor



housing assembly. (CN13)



1.The temperature of the indoor heat
exchanger is abnormally low.

2.Poor contact of the heat exchanger
sensor. (The connector is
disconnected.) (CN01)

3.Heat exchanger sensor, main P.C.
board are defective.

4.Main P.C. board is defective.

1.Indoor fan motor is defective.
(Protecting operation on the P.C.
board.)

2. Poor contact of the motor
connector.

3.P.C. board is defective.

– 64 –

10-9-2. P.C. Board Layout

[1] Sensor characteristic table

100

90
80
70
60
50

Cooling
only model

40
30

Resistance value (kW)

20
10

0

0102030 4050

TGa

Temperature (˚C)

Bottom View

(For the Top View, refer to page 71.)

TGa

Heat pump model

TD

TA, TC, TO, TE, TS

TD : Discharge temp. sensor
TGa : Gas side temp. sensor
TA : Room temp. sensor
TC : Heat exchanger temp. sensor
TO : Outdoor temp. sensor
TE : Outdoor heat exchanger temp. sensor
TS : Suction temp. sensor

– 65 –

10-9-3. Indoor Unit (Other Parts)

No. Part name

1 Room temp. (TA) sensor

Heat exchanger (TC) sensor

2 Remote control

3 Louv er motor

MP35EA7

4 Indoor f an motor

10-9-4. Outdoor Unit

Checking procedure

Disconnect the connector and measure the resistance value with tester .
(Normal temp.)

Temperature

Sensor

TA, TC (kΩ) 20,7 12,6 10,0 7,9 4,5

10°C 20°C 25°C 30°C 40°C

To item of How to judge whether remote control is good or bad of the
Judgment of trouble b y symptom.

Measure the resistance value of each winding coil by using the tester .
(Under normal temp. 25°C)

Red

Pink
Blue

1
2
3
4
5
6

Brown

Orange

Yellow

Position Resistance value

1 to 4
1 to 6
2 to 3

130 ± 10 Ω

2 to 5

Since judgment of DC motor is difficult on the single motor, ref er to 10­5-1. (3).

No. Part name

1 Compressor

(Model : D A130A1F-21F)

2 Outdoor f an motor

(Model : ICF-140-40-7)

3 Compressor thermo . Bimetal

type (Model : PW - 2AL)

4 Outdoor temperature sensor

(TO), pipe temperature sensor
(TGa), discharge temperature
sensor (TD), suction tempera­ture sensor (TS), outdoor heat
exchanger temperature sensor
(TE)

Checking procedure

Measure the resistance value of each winding by using the tester.

Red

White Black

Position Resistance value

Red - White 0,51 to 0,57 Ω
White - Black 0,51 to 0,57 Ω
Black - Red 0,51 to 0,57 Ω

Under 20°C

Measure the resistance value of winding by using the tester.

Red

White Black

1 Yellow
4 Pink

5 Gray

Position Resistance value

Yellow- Pink 5 to 20 k Ω

For details, ref er to Section 10-10.

Check conduction by using the tester.

Disconnect the connector, and measure resistance v alue with the
tester. (Normal temperature)

Sensor

Temperature

TD, TGa (kΩ) 105 64 41 27 18

10°C 20°C 30°C 40°C 50°C

TGa : Heat pump model only.
TO , TS, TE, TGa (Cooling only model) : Refer to the T A, TC characteris-

tic table in Indoor (Refer to Table 10-9-3, No. 1).

– 66 –

10-9-5. Checking Method for Each Part

No. Part name

1 Electrolytic capacitor

(For raising pressure,
smoothing)

2 Conv erter module

Checking procedure

1. Turn OFF the power supply breaker.

2. Discharge all four capacitors completely.
3 . Check that safety v alve at the bottom of capacitor is not broken.
4 . Check that vessel is not s wollen or exploded.
5 . Check that electrolytic liquid does not blow off .

6. Check that the normal charging characteristics are shown in
continuity test by the tester .

C12 C13 C14 C15

Case that product is good

Pointer swings once, and
returns slowly. When
performing test once again
under another polarity, the
pointer should return.

Heat sink IGBT side

MCC-758
Soldered
surface

C12, C13, C14, C15 → 500µF/400V
1 . Turn OFF the power supply breaker .

2 . Discharge all four capacitors completely.
3 . Check that the normal rectification characteristics are shown in

continuity test by the tester .

+ ~ – ~

Diode check IGBT check

Tester rod

+ –
~

1

–

~

2

~

+

E

1

~

2

~

1

~

2

A

E G

2

Resistance value

in good product

50kW or more

(0W in trouble)

+ ~1– ~

Tester rod

+ –
~

2

G

Mark

A

2

Resistance value

in good product

E
E

50kW or more

(0W in trouble)

E G

– 67 –

10-10. How to Simply Judge Whether Outdoor Fan Motor is Good or Bad

1. Symptom

• Outdoor fan motor does not rotate.

• Outdoor fan motor stops within several tens seconds though it started rotating.

• Outdoor fan motor rotates or does not rotate according to the position where the fan stopped., etc.
Remote control check code “02 : Outdoor block, 1A : Outdoor fan drive system error”

2. Cause

The following causes are considered when the outdoor f an motor does not normally rotate.

1) Mechanical lock of the outdoor fan motor

2) Winding error of the outdoor fan motor

3) Position-detect circuit error inside of the outdoor f an motor
or

4) Motor drive circuit error of the outdoor P.C. board

3. How to simply judge whether outdoor fan motor is good or bad

Turn OFF the breaker.

Disconnect two connectors (CN300 and CN301)

of the outdoor fan motor from the inverter.

Does the fan rotate without trouble

when rotating it with hands?

YES

If the resistance value between
1 (Red lead) – 2 (White lead)
2 (White lead) – 3 (Black lead)
3 (Black lead) – 1 (Red lead)

1 (Yellow lead) – 4 (Pink lead)

(CN301 : Motor position detection)

of the connector
(CN300 : Motor winding)
is 50 to 80

If the resistance value between

of the connector

is 5k to 20k , it is normal.

Fan motor is normal.

(Outdoor P.C. board error)

, it is normal.

YES

YES

NO

NO

NO

CN300

Fan motor error

NOTE :

Howe ver, GND circuit error inside of the motor may be accepted in some cases when the above check is
performed.

When the fan motor does not become normal even if P.C. board is replaced, replace the outdoor f an motor.

– 68 –

11-1. Indoor Unit

11. HOW TO REPLACE THE MAIN PARTS

No.



Part name

Front panel

1) After stopping the operation of the air conditioner, be
sure to turn off the circuit breaker or disconnect the
power plug from the AC wall socket.

2) Open the screw caps and remove the two screws
fixing the front panel.

3) Close the screw caps as they were.

4) Open the horizontal louver right below by your finger.

5) Open the lower side of front panel until it touches the
horizontal louver, and remove it from the indoor unit
by turning it.

<To assemble the front panel>

1) Fix the two screws to secure the front panel.

2) Close the screw caps as they were.

3) Press four places where are the center, right end, left
end and lower portions of the air outlet.

4) Check the gap between the front panel and the main
unit.

If cooling or drying operation is performed without
pressing the center of the air outlet, the surface of
the front panel may be covered with frost and have a
waterdrop.

RemarksProcedure

5 5

23 4 2 3

3 3 3

3

Electrical part



assembly

Drain-pan



assembly

1) Perfor m the process  above.

2) Remove the screw securing the shield metal plate.

3) Remove the electrical part cover by pressing the nail
located on upper portion of the electrical part cover.

4) Remove the drain guide.

5) Remove the screw securing to the end plate of the
heat exchanger.

6) Remove the connector (5p) for the fan motor and the
connector (6p) for the louver motor from the micro­computer assembly.

7) After unhooking the electrical part base by pressing
the fixing nail located on its lower portion, draw the
electrical part base out toward you to remove it from
the main unit.

8) Pull the TC sensor out from the holder of the heat
exchanger.

9) Dress the connecting cable securely as shown in the
right illustration.

(Improper dressing will cause water leakage.)

1) Perfor m the process  above.

2) Remove the drain-pan by pressing the four hooks
downwards.

(Keep it with the drain hose.)

Screw

Drain guide

Screw

Lower fixing nail

When assembling dress the connecting
cable in loop and put it into the drain-pan.

Upper nail

Electrical
part cover

Screw

TC sensor

– 69 –

Hooks

Part name

Procedure

RemarksNo.

Horizontal grille



Note:

The horizontal
grille can not be
removed without
removing the
louver motor.

Heat exchanger



Cross flow fan



1) Perfor m the process .

2) Remove the screw fixing the louver motor, and
remove the louver motor.

3) Remove the shaft of the horizontal grille from the
drain-pan.

1) Perfor m the process .

2) Remove the pipe holder from the rear side of main
unit by removing the screw.

3) Unhook the hooks fixing the left side of the heat
exchanger and remove the screw fixing it, then
remove the right side of the end plate from the rib
fixing the main unit by sliding the heat exchanger
slightly to the right side.

1) Perfor m the process .

2) Loosen the set screw of the cross flow fan.

3) Remove the screw fixing the shaft bearing base.

4) Lift slightly up the left side of the heat exchanger,
and pull the shaft bearing base out left downwards.

Louver motor

Horizontal grille Screw

Hooks

Pipe holder

Hooks fixing the
heat exchanger

Shaft bearing
base

Screw fixing the
heat exchanger

Hook

Screw

Shaft bearing



Fan motor



When assembling it, fix it with the set screw on the
position where the gap between the rear plate surface
and the left end surface of the cross flow fan is 6 ~ 7
mm.

1) Perfor m the process  above.

2) Remove the shaft bearing from the shaft bearing base.

<Caution for assembling>

• If a part of the shaft bear ing is protr uded from the
housing, assemble it after pushing its portion into the
correct position in the housing.

1) Perfor m the process  above.

2) Perfor m the process -2) above.

3) Remove the left and right motor bands.

4) Remove the fan motor after pulling the cross flow fan
out sliding it left and right.

Shaft

Shaft

bearing base

bearing base

6~7mm

RibsRibs

Cross

Cross

flow fan

flow fan

Rear plate

Mount the fan motor as
shown in figure below
when assembling.

Put the end of lead
wire at the portion
between two ribs.

– 70 –

11-2. Microcomputer

No.



Part name

Common
procedure

<P.C. board layout>

Procedure

1) Tur n the power supply off to stop the operation of air­conditioner.

2) Remove the front panel.

• Remove the two fixing screws. (φ4 x 14

3) Remove the electrical part base.

ll

l)

ll

Remarks

Replace the thermal fuse, terminal
block, microcomputer ass’y and the
P.C. board ass’y.

– 71 –

11-3. Outdoor Unit

RAS-M18YACV-E / RAS-M18YAV-E

No. Part name

Common



procedure

Procedure

1. Detachment

1) Stop operation of the air conditioner, and remove
the power plug of the indoor unit from plug
socket.

2) Remove the valve cover. (ST1TØ4 x 10

• After removing screw, remove the valve cover

pulling it downward.

3) Remove wiring cover (ST1TØ4 x 10
and then remove connecting cable.

4) Remove the upper cabinet.
(ST1TØ4 x 10

• After removing screws, remove the upper

cabinet pulling it upward.

2. Attachment

1) Attach the upper cabinet.
(ST1TØ4 x 10

• Hook the rear side of the upper cabinet to claw

of the rear cabinet, and then put it on the front
cabinet.

2) Perform cabling of connecting cable, and attach
the wiring cover .

• Insert the upper part into the upper cabinet,

insert claw which has been hooked to the
lower part into the square hole, and then fix it
with screw. (ST1TØ4 x 10

3) Attach the valve cover. (ST1TØ4 x 10

• Insert the upper part to the upper cabinet, set

hook claw of the valv e cover to square holes
(at three positions) of the main unit, and attach
it pushing upward.

ll

l 2 pcs.)

ll

ll

l 2 pcs.)

ll

ll

l 1 pc.)

ll

ll

l 1 pc.)

ll

ll

l 2 pcs.),

ll

ll

l 1 pc.)

ll

Remarks

Upper cabinet

Wiring
cover

Valve
cover

Front cabinet



1. Detachment

1) Perform work of item 1 of .

2) Remove screws (ST1TØ4 x 10
front cabinet and inverter cover and scre ws
(ST1TØ4 x 10
lower part.

• The left side of the front is made to insert to

the rear cabinet, so remove it pulling upward.

2. Attachment

1) Insert claw at the left side of the front into the
rear cabinet.

2) Hook the lower part at the right side of the front
to concave part of the bottom plate. Insert claw
of the rear cabinet into square hole of the front
cabinet.

3) Attach the removed screws to the original
positions.

ll

l 3 pcs.) of the front cabinet and

ll

ll

l 1 pc.) of the

ll

– 72 –

Claw

Square hole

No. Part name

Procedure

Remarks



Inverter
assembly

1. Detachment

1) Perform work of item 1 of .

2) Remove screw (ST1TØ4 x 10

ll

l 1 pc.) of the

ll

upper part of the front cabinet.

• If removing the inverter cover in this condition,

P.C. board can be checked.

• If there is no space in the upper part of the

upper cabinet, perform work of .

Be careful to check the in verter because
high-voltage circuit is incorporated in it.

3) Perform discharging by connecting + , – polarity
by discharging resistance (approx. 100Ω40W) or
plug of soldering iron to + , – terminals of the
C15 (printed “CAUTION HIGH VOLT AGE” is
attached.) electrolytic capacitor (500µF) on P.C.
board.

Be careful to discharge the capacitor
because the electrolytic capacitor cannot
naturally discharge and voltage remains
according to trouble type in some cases.

Inverter cover

Discharging position
(Discharging period
10 seconds or more)

Bundled
part

P. C. board
(Soldered surface)

Plug of
soldering
iron

NOTE :
This capacitor is one with mass capacity .
Therefore, it is dangerous that a lar ge
spark generates if short-circuiting be­tween + , – polarity with screwdriver, etc.
for discharging.

4) Remove screw (ST1TØ4 x 10

ll

l 1 pc.) fixing the

ll

main body and the inverter box.

5) Remove various lead wires from the holder at
upper part of the inverter box and wiring holder
at right side of the terminal block.

6) Remove the lead wire from the bundled part at
left side of the terminal block.

7) Pull the inverter box upward.

8) Disconnect connectors of various lead wires.

Requirement :
As each connector has a lock mecha­nism, avoid to remove the connector by
holding the lead wire, but b y holding the
connector.

Holder

Terminal block

The connector is one with lock,
so remove it while pushing the
part indicated by an arrow.

– 73 –

The connector which is inserted
into terminal block is one with
lock. Be sure to remove the
connector by holding the connec­tor, not b y pulling the lead wire .

No. Part name

Procedure

Remarks

Control board



assembly

1) Disconnect lead wires and connectors connected
from the control board assembly to other parts.

1. Lead wires

• Connection with terminal block : 5 wires
(Black, Orange, Red, T w o white wires)

• Connection with compressor : Remove the
connector (3P).

• Connection with reactor : Remove the rela y
connectors from P07, 08 (2P, White) and
P12, 13 (2P, Yellow).

2. Connectors

• Main control board assembly side
CN300 : Outdoor f an (3P, White)
CN301 : Outdoor f an position detection

(5P, White)

CN701 : 4 valv e (3P, Yellow) (M18YAV-E only)

• Sub-control board assembly side
CN01 : TE sensor (2P, White)
CN02 : TD sensor (3P, White)
CN04 : TS sensor (3P, Black)
CN05 : TGa sensor (3P, Yellow)
CN08 : Case thermo. (2P, White)
CN13 : B room pulse modulating v alv e

(6P, Red)

CN14 : A room pulse modulating v alv e

(6P, Black)

2) Disconnect cable connecting the main control
board assembly side and sub-control board
assembly.

• Main control board assembly side
CN704 : Connecting cable (4P, White)

• Sub.-control board assembly side
CN15 : Connecting cab le (4P, White)

3) Remove the control board assembly from P.C.
board base.

1. Main control board assemb ly side

• Remove two claws of P.C. board base, and
remove upward the heat sink with hands .

• Remove three screws fixing the heat sink
and main control board assembly side, and
replace the board with a new one.

2. Sub- control board assembly side

• Remove P.C. board base from the in verter
box.

• Remove two claws of P.C. board base, and
replace the board with a new one.

CN300, CN301 and CN701
(M18YAV-E only) at the main
control board assembly side and
CN08 and 15 at the sub- control
board assembly side are connec­tors with locks. Therefore ,
remove the connector while
pushing the part indicated by an
arrow .

When mounting a new board,
check that the board is correctly
set in the groove of base holder
of P.C. board base .



Rear cabinet

1) Perform work of item 1 of , and  .

2) Remove fixed screws fixing to the bottom plate .
(ST1TØ4 x 10

3) Remove fixed screws fixing to the heat
exchanger. (ST1TØ4 x 10

4) Remove fixed scre w fixing to the v alve mounting
plate. (ST1TØ4 x 10

ll

l 3 pcs.)

ll

ll

l 1 pc.)

ll

ll

l 2 pcs.)

ll

– 74 –

No. Part name

RemarksProcedure





Fan motor

Compressor

1) Perform work of item 1 of  and .

2) Remove the flange nut fixing the fan motor and
the propeller.

• Flange nut is loosened by turning clockwise.

(To tighten the flange nut, turn counterclock­wise.)

3) Remove the propeller fan.

4) Disconnect the connector for fan motor from the
inverter.

5) Remove the fixing screws (3 pcs.) holding by
hands so that the fan motor does not fall.

1) Perform work of item 1 of  and , , , .

2) Extract refrigerant gas.

3) Remove the partition board.
(ST1TØ4 x 10l 2 pcs.)

4) Remove the sound-insulation material.

5) Remove terminal cover of the compressor , and
disconnect lead wire of the compressor thermo.
and the compressor from the terminal.

6) Remove pipe connected to the compressor with
a burner.

7) Remove the fixing screw of the bottom plate and
heat exchanger . (ST1TØ4 x 10l 1 pc.)

8) Remove the fixing screw of the bottom plate and
valve clamping plate. (ST1TØ4 x 10l 2 pcs.)

9) Pull upward the refrigeration cycle.

10) Remove nut fixing the compressor to the

bottom plate.

Fan motor

Propeller fan

Flange nut

Partition
board

Valve
clamping
plate

Compressor
thermo.

Compressor



Reactor

1) Perform work of item 1 of , and .

2) Remove lead wires clung in holder on the
partition board.

3) Remove screws fixing the reactor .
(ST1TØ4 x 10l 2 pcs.)

– 75 –

Reactor

No. Part name

RemarksProcedure





Pulse
modulating
valve coil

Fan guard

1. Detachment

1) Perform work of item 1 of , and , , .

2) Turn the coil clockwise (counterclockwise) by 90
degrees, and remove coil from the pulse modu­lating valve.

2. Attachment

1) Set take-out part of the lead wire of coil to the
coil inserting position of the pulse modulating
valve, and attach the coil.

2) Turn the coil by 90 degrees , set surely the
concave part at lower part of the coil to the
positioning hole of the pulse modulating valve,
and then fix the coil.

The pulse modulating valve has A room
side and B room side. After mounting it,
check that coil at B room side (Red
marking is marked on the pulse modulat­ing valve.) is connected to CN13 of the
control board assembly.

1. Detachment

1) Perform work of item 1 of , and .

2) Remove the front cabinet, and put it down so
that fan guard side directs downward.

Perform work on a corrugated car dboar d,
cloth, etc. to prevent flaw to the product.

Take-out part
of lead wire

Notch

Coil inserting
position

Coil inserting
position

Coil fix
position

Positioning
hole

Minus screwdriver

Hooking claw

3) Remove the hooking claws by pushing minus
screwdriver according to the arrow mark in the
right figure, and remove the fan guard.

2. Attachment

1) Insert claw of the fan guard in the hole of the
front cabinet. Push the hooking cla ws (10
positions) by hands and fix the claws.

All the attaching works have completed.
Check that all the hooking claws are fix ed
to the specified positions.

– 76 –

No. Part name

RemarksPr ocedure

11 Replacement

of temperature
sensor for
servicing only

Common service
parts of sensor
TO , TS, TE, TGa
(without TD , TGa
for heat pump
model)

1) Cut the sensor 100 mm longer than old one.

2) Cut the protective tube after pulling out it
(200 mm).

3) Move the protective tube toward the thermal
sensor side and tear the tip of lead wire in
two then strip the covering part.

4) Pass the stripped part through the thermal
constringent tube.

5) Cut the old sensor 100 mm length on the
connector side, and recycle that connector.

6) Tear the lead wire in two on the connector
side and strip the covering part.

7) Twist the leads on the connector and sensor
sides, and solder them.

8) Move the thermal constringent tubes toward
the soldered parts and heat them with the
dryer and constring them.

9) Wind the attached color tape round the both
terminals of the protective tube when colored
protective tube is used.

10)Fix the sensor again.

NOTES :

1) Store the joint part of the sensor and the
connector in the electric parts box.

2) Never joint them near the thermal sensor
part. Otherwise it would cause insulation
inferiority because of dew drops.

3) When replacing the sensor using the colored
protective tube, wind the color tape matching
the color of that tube.

Thermal
sensor part

200

Thermal
constringent tube

Cutting here

100

15

70

Winding the color tape

Connector

Soldered part

Dryer

Cutting here

100

Cutting here

15

70

These are parts
for servicing
sensors.

Please check
that the accesso­ries shown in the
right table are
packed.

Parts name Q'ty Remarks

1 Sensor 1 Length : 3m
2 Sensor Spring (A) 1 For spare
3 Sensor Spring (B) 1 For spare
4 Thermal constringent tube 3 Including one spare
5 Color tape 1 9 colors
6 T erminal 3

– 77 –

MCC-758

– 78 –

MCC-775

– 79 –

12-1. Indoor Unit (1)

RAS-M10, M13YKV-E
RAS-M10, M13YKCV-E

402

12. EXPLODED VIEWS AND PARTS LIST

407 : RAS-M10YKCV-E
408 : RAS-M13YKCV-E
409 : RAS-M13YKV-E
410 : RAS-M10YKV-E

404

412

403

405

Location Part

No. No.

402 43T60002 T erminal Block, 3P,

AC 300V, 20A

403 43T69004 Sensor, Heat Exchanger

10kΩ, 25°C

404 43T69005 Sensor, Thermostat

10kΩ, 25°C

405 43T69031 P.C. Board, Assembly ,

WRS-LED, MCC-766

407 43T69046 P.C. Board Assembly,

MCC-772 (M10YKCV -E)

Description

Location Part

No. No.

408 43T69047 P.C. Board Assemb ly,

MCC-772 (M13YKCV -E)

409 43T69050 P.C. Board Assemb ly,

MCC-772 (M13YKV -E)

410 43T69049 P.C. Board Assemb ly,

MCC-772 (M10YKV -E)

412 43T61001 Base, E-Parts,

ABS, Black UL94-5V

413 43T62006 Base, Shield

SGCC-Z08-LUB

Description

413

– 80 –

Indoor Unit (2)

201

202

206

245

203

207

210

211

214

216

217

215

221

208

222

212

209

229

230

244

243

213

239

219

228

218

220

231

224

225

241

233

232

226

227

236

237

204

Location Part

No. No.

201 43T00043 Front Panel Assembly
202 43T00044 Grille, Suction
203 43T80001 Air Filter (L)
204 43T80002 Air Filter (R)
206 43T07021 Screw Cap (L)
207 43T07020 Screw Cap (R)
208 43T08085 LED Panel (M10YKCV-E)
208 43T08086 LED Panel (M13YKCV-E)
208 43T08088 LED Panel (M10YKV -E)
208 43T08089 LED Panel (M13YKV -E)
209 43T19004 Accepted Signal Filter
210 43T09035 Horizontal Louver Assembly

for Service
211 43T09004 Louver Assembly
212 43T70001 Drain Hose Assembly
213 43T21003 Motor, Stepping
214 43T07001 Bushing
215 43T44020

215 43T44024
216 43T47006 Pipe, Delivery

217 43T47005 Pipe, Suction
218 43T49007 Pipe, Shield
219 43T19003 Holder, Sensor

Refrigerantion Cycle Assembly

(M10YKCV -E, M13YKCV -E)

Refrigerantion Cycle Assembly

(M10YKV -E, M13YKV -E)

Description

242

Location Part

No. No.

220 43T49003 Spring
221 43T49028 Plate, EVA-SEAL
222 43T49023 Holder of Plate of EVA-SEAL
224 43T79002 Drain Guide
225 43T39002 Motor Band (Left)
226 43T39001 Motor Band (Right)
227 43T21010 Fan Motor
228 43T20007 Fan, Cross Flow
229 43T22002 Bearing
230 43T39003 Base, Bearing
231 43T03001 Rear Plate
232 43T07002 Pipe Holder
233 43T82001 Installation Plate
236 43T69032 Wireless Remote Control

236 43T69044 Remote Control
237 43T63002 Holder, Remote Control

238 43T62020 Cover , E-P arts
239 43T62002 Cover, Up, Terminal
241 43T62003 Cord Clamp
242 43T62004 Shield Cover
243 43T39010 Drain Guide (UP)
244 43T49024 U Pipe Holder
245 43T01002 Mark

238

Description

(M10YKCV -E, M13YKCV -E)
(M10YKV -E, M13YKV -E)

– 81 –

12-2. Outdoor Unit

31

32

27

2

17, 18

1

8

11, 13

19

7

10

28

20

12, 14

21

23

9

22

24, 25

6

2

5

33

1

4

26

3

4

22
23

30

Location Part

No. No.

01 43005368 Cabinet, Back, Assembly
02 43005369 Cabinet, Upper, Assembly
03 43005401 Cabinet, Front, Assembly
04 4301V030 Guard, Fan
05 43042461 Base, Assembly
06 4301V012 Cover, Valve, Packed
07 43062230 Cover, Wiring, Assembly
08 43019903 Hanger
09 43041771 Compressor
10 43043633 Condenser, Assembly
11 43046332 Valve, Packed, 6,35
12 43046349 Valve, Packed, 9,52
13 43147196 Bonnet, 1/4 IN
14 43047401 Bonnet, 3/8 IN
15 43047491 Tube, Capillary, I.D.1,5
16 43146448 Tube, Capillary
17 43046351 Valve, Pulse Modulating

Description

5

Location Part

No. No.

18 43046347 Coil, P.M.V.
19 43058264 Reactor
20 43050298 Thermo. Bimetal, CS-7
21 4302C019 Motor, Fan, DC
22 43047549 Nut, Flange
23 43020310 Fan, Propeller
24 43097166 Nut
25 43049643 Cushion, Rubber
26 43063187 Holder, Sensor
27 43049654 Holder, Sensor
28 43063195 Holder, Thermo. Bimetal
29 43019904 Holder, Sensor
30 4308N277 Manual
31 43046352 Valve, 4-way (M18YAV-E)
32 43046348 Solenoid Coil (M18YAV-E)
33 43032441 Drain Nipple (M18YAV-E)

29

Description

15, 16

– 82 –

12-3. P.C. Board Layout

RAS-M18YAV-E / RAS-M18YACV-E

706

704

702

709

708

705

710

712

TO Sensor
TE Sensor (Ø6)
TS Sensor
TGa Sensor (Ø4)

TD Sensor (Ø4)

703

Heat pump model

702

TO Sensor
TS Sensor

TGa Sensor
TD Sensor

4

4

3

2

1

4

3

2

1

711

703

Cooling model

707

Location Part

No. No.

Description

702 43050382 Sensor, TC (Ø6)
703 43050334 Sensor, TD (Ø4)
704 43060052 Fuse, 25A, 250V, Lead Type
705 4306A027 Terminal block, 9P
706 43060726 Fuse, 15A, 250V, Lead Type
707 4306A026 Terminal block, 3P
708 43062215 Base, P.C. Board
709 43063306 Heatsink

– 83 –

Location Part

No. No.

Description

710 4306S180 P.C. Board Assemb ly,

MCC-758 (M18Y A CV -E)

710 4306S181 P.C. Board Assemb ly,

MCC-758 (M18Y AV-E)

711 4306S177 P.C. Board Assemb ly,

MCC-775 (M18Y A CV -E)

711 4306S178 P.C. Board Assemb ly,

MCC-775 (M18Y AV-E)

712 43050398 Sensor, TGa (F4)

(M18Y AV-E)