Toshiba RAS-M16YKCV-E SERVICE MANUAL

CONTENTS

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

2. REFRIGERANT R410A................................................................................................... 7

3. CONSTRUCTION VIEWS.............................................................................................. 15

4. WIRING DIAGRAM ....................................................................................................... 17

5. SPECIFICATIONS OF ELECTRICAL PARTS .............................................................. 19

6. REFRIGERANT CYCLE DIAGRAM.............................................................................. 20

7. CONTROL BLOCK DIAGRAM ..................................................................................... 22

8. OPERATION DESCRIPTION ........................................................................................ 24

9. INSTALLATION PROCEDURE ..................................................................................... 35

10. HOW T O DIAGNOSE THE TR OUBLE ........................................................................... 43

11. HOW TO REPLACE THE MAIN PARTS........................................................................ 62

12. EXPLODED VIEWS AND PARTS LIST ........................................................................ 73

– 2 –

1. SPECIFICATIONS

1-1. Specifications

Unit model Indoor
Cooling capacity (kW)

Cooling capacity range (kW)
Power supply
Electric

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

Indoor Unit model

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 unit operating (dB•A)

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

Indoor unit Unit model

Liquid side

Gas side
Outdoor unit Unit model

A unit

B unit

C unit
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

• 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-M10YKCV-E, RAS-M13YKCV-E, RAS-M16YKCV-E

RAS-3M23YACV-E

6,7

2,2~7,0

220–240V–1Ph–50Hz

220V 230V 240V

RAS-M10YKCV-E, RAS-M13YKCV-E, RAS-M16YKCV-E

0,15

30

91 87 83

RAS-3M23YACV-E

9,84 9,39 8,98

2060

95

10,29 9,84 9,43

3,12

RAS-M10YKCV-E RAS-M13YKCV-E RAS-M16YKCV-E

36 39 42
33 35 39
30 30 33

RAS-3M23YACV-E

45
48

RAS-M10YKCV-E RAS-M13YKCV-E RAS-M16YKCV-E

265 265 265
790 790 790
189 189 189

888

19 19 19

470 520 600

RAS-3M23YACV-E

695
780
270

48
40

2100

Flare connection

RAS-M10YKCV-E RAS-M13YKCV-E RAS-M16YKCV-E

Ø6,35 Ø6,35 Ø6,35
Ø9,52 Ø9,52 Ø12,7

RAS-3M23YACV-E

Ø6,35 / Ø12,7
Ø6,35 / Ø9,52
Ø6,35 / Ø9,52

20
40
40
10

R410A

1,5
3 Wires : includes earth
4 Wires : includes earth

21–32
10–43

1
1
2
1

2 (Ø3,1 x 16L)

1
1
2

6 (Ø4 x 25L)

1
1
1

– 3 –

1-2.

Specifications of Performance When Each Indoor Unit is Combined with Other Unit

Operating

status

1 unit 220

2 units 220

3 units 220

Power

supply

(V)

230
240
220
230
240
220
230
240

230
240
220
230
240
220
230
240
220
230
240
220
230
240
220
230
240

230
240
220
230
240
220
230
240
220
230
240

Indoor unit Unit capacity (kW)

ABCABC

10 — — 2,7 — —
10 — — 2,7 — —
10 — — 2,7 — —
13 — — 3,7 — —
13 — — 3,7 — —
13 — — 3,7 — —
16 — — 4,5 — —
16 — — 4,5 — —
16 — — 4,5 — —
10 10 — 2,7 2,7 —
10 10 — 2,7 2,7 —
10 10 — 2,7 2,7 —
10 13 — 2,45 3,35 —
10 13 — 2,45 3,35 —
10 13 — 2,45 3,35 —
10 16 — 2,21 3,69 —
10 16 — 2,21 3,69 —
10 16 — 2,21 3,69 —
13 13 — 2,95 2,95 —
13 13 — 2,95 2,95 —
13 13 — 2,95 2,95 —
13 16 — 2,71 3,29 —
13 16 — 2,71 3,29 —
13 16 — 2,71 3,29 —
16 16 — 3,05 3,05 —
16 16 — 3,05 3,05 —
16 16 — 3,05 3,05 —
10 10 10 2,13 2,13 2,13
10 10 10 2,13 2,13 2,13
10 10 10 2,13 2,13 2,13
10 10 13 1,99 1,99 2,72
10 10 13 1,99 1,99 2,72
10 10 13 1,99 1,99 2,72
10 13 13 1,80 2,45 2,45
10 13 13 1,80 2,45 2,45
10 13 13 1,80 2,45 2,45
10 10 16 1,83 1,83 3,04
10 10 16 1,83 1,83 3,04
10 10 16 1,83 1,83 3,04

Cooling Power Operation Outdoor

capacity consumption current noise

(kW) (W) (A) (dB)

2,7 770 4,12 45

(1,4 to 3,2) (320 to 950) (2,08 to 5,08)

2,7 770 3,94 45

(1,4 to 3,2) (320 to 950) (1,99 to 4,86)

2,7 770 3,77 45

(1,4 to 3,2) (320 to 950) (1,90 to 4,66)

3,7 1200 6,34 48

(1,4 to 4,4) (320 to 1470) (2,08 to 7,51)

3,7 1200 6,07 48

(1,4 to 4,4) (320 to 1470) (1,99 to 7,18)

3,7 1200 5,81 48

(1,4 to 4,4) (320 to 1470) (1,90 to 6,88)

4,5 1600 7,66 48

(1,4 to 4,9) (320 to 1750) (2,08 to 8,37)

4,5 1600 7,32 48

(1,4 to 4,9) (320 to 1750) (1,99 to 8,01)

4,5 1600 7,02 48

(1,4 to 4,9) (320 to 1750) (1,90 to 7,68)

5,4 1500 7,18 48

(1,8 to 6,0) (360 to 1880) (2,34 to 9,00)

5,4 1500 6,86 48

(1,8 to 6,0) (360 to 1880) (2,24 to 8,60)

5,4 1500 6,58 48

(1,8 to 6,0) (360 to 1880) (2,14 to 8,25)

5,8 1800 8,61 48

(1,8 to 6,3) (360 to 1970) (2,34 to 9,43)

5,8 1800 8,24 48

(1,8 to 6,3) (360 to 1970) (2,24 to 9,02)

5,8 1800 7,89 48

(1,8 to 6,3) (360 to 1970) (2,14 to 8,64)

5,9 1830 8,76 48

(1,8 to 6,4) (360 to 2000) (2,34 to 9,57)

5,9 1830 8,38 48

(1,8 to 6,4) (360 to 2000) (2,24 to 9,15)

5,9 1830 8,03 48

(1,8 to 6,4) (360 to 2000) (2,14 to 8,77)

5,9 1830 8,76 48

(1,8 to 6,4) (360 to 2000) (2,34 to 9,57)

5,9 1830 8,38 48

(1,8 to 6,4) (360 to 2000) (2,24 to 9,15)

5,9 1830 8,03 48

(1,8 to 6,4) (360 to 2000) (2,14 to 8,77)

6,0 1850 8,85 48

(1,8 to 6,4) (360 to 2000) (2,34 to 9,57)

6,0 1850 8,50 48

(1,8 to 6,4) (360 to 2000) (2,24 to 9,15)

6,0 1850 8,11 48

(1,8 to 6,4) (360 to 2000) (2,14 to 8,77)

6,1 1870 8,95 48

(1,8 to 6,5) (360 to 2050) (2,34 to 9,81)

6,1 1870 8,56 48

(1,8 to 6,5) (360 to 2050) (2,24 to 9,38)

6,1 1870 8,20 48

(1,8 to 6,5) (360 to 2050) (2,14 to 8,99)

6,4 1880 9,00 48

(2,2 to 7,0) (420 to 2300) (2,73 to 11,0)

6,4 1880 8,60 48

(2,2 to 7,0) (420 to 2300) (2,61 to 10,53)

6,4 1880 8,25 48

(2,2 to 7,0) (420 to 2300) (2,50 to 10,09)

6,7 2150 10,29 48

(2,2 to 7,0) (420 to 2300) (2,73 to 11,0)

6,7 2150 9,84 48

(2,2 to 7,0) (420 to 2300) (2,61 to 10,53)

6,7 2150 9,43 48

(2,2 to 7,0) (420 to 2300) (2,50 to 10,09)

6,7 2150 10,29 48

(2,2 to 7,0) (420 to 2300) (2,73 to 11,0)

6,7 2150 9,84 48

(2,2 to 7,0) (420 to 2300) (2,61 to 10,53)

6,7 2150 9,43 48

(2,2 to 7,0) (420 to 2300) (2,50 to 10,09)

6,7 2150 10,29 48

(2,2 to 7,0) (420 to 2300) (2,73 to 11,0)

6,7 2150 9,84 48

(2,2 to 7,0) (420 to 2300) (2,61 to 10,53)

6,7 2150 9,43 48

(2,2 to 7,0) (420 to 2300) (2,50 to 10,09)

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

• Indoor unit 10 : RAS-M10YKCV-E, 13 : RAS-M13YKCV -E, 16 : RAS-M16YKCV -E

– 4 –

1-2-1. Operation Characteristic Curve

12

• Conditions

11

Indoor : DB27˚C/WB19˚C
Outdoor : DB35˚C

10

Air flow : High
Pipe length 5m × 3

9

3 units operating

8
7
6
5

Current (A)

4
3
2
1
0

100 2030405060708090100

Inverter output frequency (rps)

220V

240V

230V

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

105115

• Conditions

110

105

100

Capacity ratio (%)

Indoor : DB27˚C
Outdoor : DB35˚C
Indoor air flow: High
Pipe length 5m × 3
3 units operating

95

90

85

0

Indoor air wet bulb temp. (˚C)

100

95
90
85
80
75
70

Capacity ratio (%)

65
60
55
50

32 34 36 38 40 42 44 4614 16

Current Limited Start

• Conditions
Indoor : DB27˚C/WB19˚C
Indoor air flow: High
Pipe length 5m × 3
3 units operating

Outdoor temp. (˚C)

* Capacity ratio : 100% = 6,7 kW

4318 20 22 24

– 5 –

1-3. Electrical Data

Combination of

indoor unit operation

1 unit 10 — —

13 — —
16 — —

2 units 10 10 —

13 10 —
16 10 —
13 13 —
16 13 —
16 16 —

3 units 10 10 10

13 10 10
13 13 10
16 10 10

1 unit 10 — —

13 — —
16 — —

2 units 10 10 —

13 10 —
16 10 —
13 13 —
16 13 —
16 16 —

3 units 10 10 10

13 10 10
13 13 10
16 10 10

1 unit 10 — —

13 — —
16 — —

2 units 10 10 —

13 10 —
16 10 —
13 13 —
16 13 —
16 16 —

3 units 10 10 10

13 10 10
13 13 10
16 10 10

System

Volts-

Hz

50 220-1 198 264

50 230-1 198 264

50 240-1 198 264

Voltage range Power supply

Ph.

Min. Max. MCA ICF

MOCP

(Amps)

4,99 4,99 8,46
7,76 7,76 13,45
9,41 9,41 16,42

8,78 8,78 15,16
10,56 10,56 18,37
10,75 10,75 18,71
10,75 10,75 18,71
10,86 10,86 18,91
10,99 10,99 19,14
11,01 11,01 19,06
12,63 12,63 21,97
12,63 12,63 21,97
12,63 12,63 21,97

4,76 4,76 8,05

7,43 7,43 12,85

8,99 8,99 15,66

8,38 8,38 14,44
10,10 10,10 17,54
10,28 10,28 17,86
10,28 10,28 17,86
10,43 10,43 18,13
10,50 10,50 18,26
10,51 10,51 18,16
12,06 12,06 20,95
12,06 12,06 20,95
12,06 12,06 20,95

4,55 4,55 7,67

7,10 7,10 12,26

8,61 8,61 14,98

8,03 8,03 13,81

9,66 9,66 16,75

9,84 9,84 17,07

9,84 9,84 17,07

9,94 9,94 17,25
10,05 10,05 17,45
10,08 10,08 17,38
11,55 11,55 20,03
11,55 11,55 20,03
11,55 11,55 20,03

Compressor Fan motor FLA

MSC RLA Indoor Outdoor

3,47 3,47 0,15 x 1 = 0,15 0,5
5,69 5,69 0,15 x 1 = 0,15 0,5
7,01 7,01 0,15 x 1 = 0,15 0,5
6,38 6,38 0,15 x 2 = 0,30 0,5
7,81 7,81 0,15 x 2 = 0,30 0,5
7,96 7,96 0,15 x 2 = 0,30 0,5
7,96 7,96 0,15 x 2 = 0,30 0,5
8,05 8,05 0,15 x 2 = 0,30 0,5
8,15 8,15 0,15 x 2 = 0,30 0,5
8,05 8,05 0,15 x 3 = 0,45 0,5
9,34 9,34 0,15 x 3 = 0,45 0,5
9,34 9,34 0,15 x 3 = 0,45 0,5
9,34 9,34 0,15 x 3 = 0,45 0,5
3,29 3,29 0,15 x 1 = 0,15 0,5
5,42 5,42 0,15 x 1 = 0,15 0,5
6,67 6,67 0,15 x 1 = 0,15 0,5
6,06 6,06 0,15 x 2 = 0,30 0,5
7,44 7,44 0,15 x 2 = 0,30 0,5
7,58 7,58 0,15 x 2 = 0,30 0,5
7,58 7,58 0,15 x 2 = 0,30 0,5
7,70 7,70 0,15 x 2 = 0,30 0,5
7,76 7,76 0,15 x 2 = 0,30 0,5
7,65 7,65 0,15 x 3 = 0,45 0,5
8,89 8,89 0,15 x 3 = 0,45 0,5
8,89 8,89 0,15 x 3 = 0,45 0,5
8,89 8,89 0,15 x 3 = 0,45 0,5
3,12 3,12 0,15 x 1 = 0,15 0,5
5,16 5,16 0,15 x 1 = 0,15 0,5
6,37 6,37 0,15 x 1 = 0,15 0,5
5,78 5,78 0,15 x 2 = 0,30 0,5
7,09 7,09 0,15 x 2 = 0,30 0,5
7,23 7,23 0,15 x 2 = 0,30 0,5
7,23 7,23 0,15 x 2 = 0,30 0,5
7,31 7,31 0,15 x 2 = 0,30 0,5
7,40 7,40 0,15 x 2 = 0,30 0,5
7,30 7,30 0,15 x 3 = 0,45 0,5
8,48 8,48 0,15 x 3 = 0,45 0,5
8,48 8,48 0,15 x 3 = 0,45 0,5
8,48 8,48 0,15 x 3 = 0,45 0,5

NOTE :

Model of Indoor unit 10 : RAS-M10YKCV-E, 13 : RAS-M13YKCV -E, 16 : RAS-M16YKCV -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

Indoor temp. °C 27 19

FLA : Full Load Amps.
RLA : Rated Load Amps. RLA under conditions on the right.

Outdoor temp. °C 35 —

– 6 –

DB WB

2. REFRIGERANT R410A

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

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 prev ent
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 lev 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 w ater 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 valve or capillary tube
may become block ed 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
available on the mark et.

– 7 –

Table 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 k et joints are
used. Prior to use, be sure to remo ve 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 Tables 2-2-3 ~ 2-2-6
below .

T a ble 2-2-2 Minim um thic knesses 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 they are br azed
for connections, and used mainly f or thic k
pipings whose diameter is larger than 20 mm.
Thicknesses of socket 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, slowly 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 burrs and clean the cut surface
before installation.

– 8 –

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, perf orm the flare
processing correctly .

Use either a flare tool for R410A or conv en­tional flare tool.

T a ble 2-2-3 Dimensions related to flare pr ocessing f or R410A

Nominal

diameter

Outer

diameter

(mm)

Thickness

(mm)

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.

Fig. 2-2-1 Flare processing dimensions

Flare tool for

R410A clutch type

ØD

A

A (mm)

Conventional flare tool

Clutch type Wing nut type

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

Table 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
5/8 15,88 1,0

T a ble 2-2-5 Flare and flare nut dimensions f or R410A

Thickness

(mm)

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

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

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

– 9 –

T a ble 2-2-6 Flare and flare nut dimensions f or 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 .

Table 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)

– 10 –

2-3. Tools

2-3-1. Required T ools

The service port diameter of pac ked valv e of the outdoor unit in the air conditioner using R410A is changed to prev ent
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 ollowing three types .

(1) T ools e xclusive for R410A (Those which cannot be used for con v entional refrigerant (R22))
(2) T ools e xclusive for R410A, but can be also used for con ventional refrigerant (R22)
(3) T ools commonly used f or R410A and f or conventional refrigerant (R22)

The table below shows the tools exclusive 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

 Refr igerant cylinder
 Leakage detector
 Charging cylinder

(Note 1) When flaring is carried out for R410A using the conventional 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 dev eloped.

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 xclusiv e 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

– 11 –

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)

– 12 –

(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 f oreign
matter on the metal surface, it assists the flow
of brazing filler.

• In the brazing process, it prevents the metal
surface from being oxidiz ed.

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

– 13 –

Nitrogen gas

cylinder

Pipe

Flow meter

M

Stop valve

From Nitrogen cylinder

Nitrogen
gas

Rubber plug

(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 for silver brazing
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.



Copper - Copper

Piping

material

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

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

– 14 –

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,,,,,,,

,,,,,,,

,,,,,,,

,,,,,,

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,,,,,,

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3. CONSTRUCTION VIEWS

3-1. Indoor Unit

RAS-M10YKCV-E, RAS-M13YKCV-E, RAS-M16YKCV-E

Air inlet

265

Air outlet

Air filter

790

Heat exchanger

50 94

790

Hanger

232 326 232

47

Back body

Knock out system

Front panel

189

47

50

10

External
length reference

Hanger

26

46

265

178,5

37

3,5

321

Connecting pipe (0,39m)

Flare ø9,52 : RAS-M10YKCV-E, RAS-M13YKCV-E

( )

Flare ø12,7 : RAS-M16YKCV-E

Hanger

65965,5

Drain hose (0,54m)

Connecting pipe (0,49m)

(Flare ø6,35)

65,5
450
344
326

Minimum
distance

2,5

to ceiling

66 or more

Minimum

17 20

distance
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

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

– 15 –

3-2. Outdoor Unit

RAS-3M23YACV-E

310

A leg part

296

270

600

90

ø11 × 17U-shape hole

50

(For ø8-ø10 anchor bolt)

Hanger

(ø6 hole pitch)

(Anchor bolt long hole pitch)

B leg part

Fan
guard

687

695

8

18

115,5

780

8-ø6 hole
(For fixing outdoor unit)

ø11 × 17 long hole

(For ø8-ø10 anchor bolt)

Charging
port

68,5

123,8

332

Valve
cover

53 53 53 53 53

86,2

Z

Connecting pipe port

(Pipe dia.ø6,35)

Connecting pipe port

(Pipe dia.ø9,52)

Connecting pipe port

(Pipe dia.ø12,7)

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

Intake

310

100 or

C

more

For installation of the outdoor unit,
open (60cm or more) two directions at
least of A , B , C , and D directions.

Z

Mounting dimensions of anchor bolt

50 or more

200 or more

B

D

Outlet

600

Outside line
of product

Intake

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

view

A

250 or more

(Minimum distance
from wall)

Detailed A leg part

50
36

11

310

296

R5,5

310

296

11

36
50

Detailed B leg part

600

2-ø6 hole

2-ø6 hole

Outside line
of product

600

R15

Outside line
of product

R15

R5,5

– 16 –

4-1. Indoor Unit

RAS-M10YKCV -E
RAS-M13YKCV -E
RAS-M16YKCV -E

INDOOR

TERMINAL

BLOCK

2

BLK

1

WHI

2

RED

3

BLK

P04

CN31
CN30
CN23

R109

VARISTOR

SG01 DSA

T6,3A 250V

F01 FUSE

3

4. WIRING DIAGRAM

LOUVER

MOTOR

BLU

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

R116

J04

R21

IC04

L01

C15

MAIN P.C. BOARD

(MCC-772)

C01

PNK

YEL

CN07

R01

ORN

RED

BRW

DB01

C02

FAN MOTOR

DC MOTOR

5 4 3 2
5 4 3 211

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

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

T a ble 4-1-1 Simple chec k points f or diagnosing faults

Diagnosis result

Turn on the main switch or breaker to check if the OPERATION indicator
flashes. (Check the primar y and secondar y 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

IC

IC01

THERMO
SENSOR

(TA)

CN01

21
21

BLK

BLK

HEAT

EXCHANGER

SENSOR

(TC)

COLOR

IDENTIFICATION

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

GRN

:

&YEL

YELLOW

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

– 17 –

4-2. Outdoor Unit

RAS-3M23YACV-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

P19
P20

P18
P17

REACTOR

MCC-758

ELECTRONIC

STARTER

POWER
SUPPLY

220–230–240V~

50Hz

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

L

N 1 2 3 1 2 3

FAN MOTOR

FM

1

PNK

YEL

RED

WHI

GRY

221

P07P08

C14C12

CN301

C15C13

CT

RELAY

1234455
123

F03
FUSE
15A

F04
FUSE
3,15A

CN300

BLK

321
321

P06

SURGE

ABSORBER

VARISTOR

WHI

BLKBLK

F01
FUSE
25A

CN704

CN501

P11

P12
P13

P14

To

INDOOR

UNIT

A

BRW

1

RED

2

ORN

3

YEL

4

1

313

YEL

11
22

YEL

PUR

REDP21
WHIP22
BLKP23

To

INDOOR

UNIT

B

REACTOR

PNK
ORN
RED

WHI

BRW

RED

ORN

YEL

BLK

GRY

REACTOR

1

1

2

2

CM

3

3

COMPRESSOR

To

INDOOR

UNIT

C

~ ~ ~ ~

1 2 3 4

REACTOR

THERMOSTAT for COMPRESSOR

1
2
3
4

1
2
3
4

P03
P04
P05
P06

CN15

FUSE 6,3A

P02
P01

F01

PHOTO

COUPLER

CN08

CN02

CN03

CN05

CN06

CN07

CN14

SUB

P.C. BOARD

MCC-775

CN13

CN12

1 1
2 2

1 1
2 2
3 3

1 1
2 2

1 1
2 2
3 3

1 1
2 2
3 3

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

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

ORN

BLK

BLK

BLK

BLK

BLK

GRY
RED
BLU
ORN
YEL
WHI

GRY
RED
BLU
ORN
YEL
WHI

GRY
RED
BLU
ORN
YEL
WHI

YEL

BRW

GRN

TD

TO

TGa

TGb

TGc

P.M.V.

A UNIT

P.M.V.

B UNIT

P.M.V.

C UNIT

– 18 –

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

GRN : GREEN

5. SPECIFICATIONS OF ELECTRICAL PARTS

5-1. Indoor Unit

RAS-M10YKCV-E, RAS-M13YKCV-E, RAS-M16YKCV-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 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) MA2830P-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-3M23YACV-E

TMP87PM40AF or

TMP87CM40AF

( – ) 10kΩ at 25°C

No. Parts name Model name Rating

1 SC coil (Noise filter)

2 DC-DC transformer SWT-43 Secondary side 7,5V x 1, 13V x 1
3 Reactor CH38Z-K L=10mH, 16A x 2

4 Outside fan motor ICF-140-40-8 DC140V, 40W
5 Fan control relay AJQ1341

Discharge temp. sensor

6

(TD sensor)

Outside air temp. sensor

7

(TO sensor)

Temp. sensor at A room

8

gas side (TGa sensor)

Temp. sensor at B room

9

gas side (TGb sensor)

Temp. sensor at C room

10

gas side (TGc sensor)

11 Terminal block (9P) ——— 20A, AC250V (9P x 2)

12 Fuse

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

15 Compressor DA130A1F-21F 3-phases 4-poles 1100W
16 Compressor thermo. PW-2AL OFF: 125 ± 4°C, ON: 90 ± 5°C
17 Converter module MP7002 Diode: 25A, 600V, IGBT: 40A, 600V
18 Reactor CH43Z-K L = 10mH, 1A x 2

SC-15-S06J 15A, 0,6mH

SC-20-01J 20A, 150µH

Primary side DC280V

Coil DC12V
Contact AC125V, 3A

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

For protection of

switching power source

For protection of transistor

module breakage

For protection of

inverter input overcurrent

LLQ2G501KHUATF

400LISN500K35F

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

26,5V x 3, 16V x 1, 15V x 1

– 19 –

6. REFRIGERANT CYCLE DIAGRAM

6-1. Refrigerant Cycle Diagram

To

C room

To

B room

INDOOR UNIT A

Indoor heat

exchanger

T1

Temp. measurement

To

C room

To

B room

Connecting pipe
Thickness : 0,8 mm

Ø9,52 :
RAS-M10YKCV-E
RAS-M13YKCV-E

Ø12,7 :
RAS-M16YKCV-E

Pressure

P

measurement
Gauge attaching port

Vacuum pump
connecting port

Cross flow fan

Connecting pipe
Thickness : 0,8 mm

Ø6,35

Sectional shape
of heat insulator

(Ø9,52) (Ø9,52) (Ø12,7) (Ø6,35) (Ø6,35) (Ø6,35)

TGaTGbTGc

Allowable height

Strainer

Pulse modulating
valve at liquid side
(SEV15RC2)

Per 1 unit
Max. : 20m
Min. : 2m

Total
Max. : 40m

difference : 10m

Allowable pipe length

Accumulating tank
Ø51 x 300
(460cc)

Temp. measurement

Outdoor heat

T

2

OUTDOOR UNIT

TD

Compressor
DA130A1F-21F

exchanger

Propeller fan

Refrigerant amount : 1,5kg (R410A)

NOTE :

Gas leak check position
Refrigerant flow

NOTE :

The maximum pipe length of this air conditioner is 40 m. The additional charging of refrigerant is unnecessary
because this air conditioner is designed with charge-less specification.

– 20 –

6-2. Operation Data

Temperature
condition (°C)

Indoor Outdoor

27/19 35/–

No. of

operating

units

1 unit

2 units

3 units

Combinations

of indoor units

10 — —
13 — —
16 — —
10 10 —
13 10 —
16 10 —
13 13 —
16 13 —
16 16 —
10 10 10
13 10 10
16 10 10
13 13 10

Standard

pressure

P (Mpa)

0,92 1 1 42
0,85 9 47
0,73 8 50
0,96 10,5 to 11,5 49
0,92 11 to 12 51
0,92 11 to 12 51
0,92 11 to 12 51
0,92 11 to 12 51
0,92 11 to 12 51
1,04 12,5 to 13,5 51
0,98 12 to 13 52
0,98 12 to 13 52
0,98 12 to 13 52

Surface temp. of

heat exchanger

T1 (°C) T2 (°C)

Fan speed

Indoor Outdoor

High Med. 37
High High 57
High High 73
High High 69
High High 78
High High 78
High High 78
High High 78
High High 78
High High 81
High High 89
High High 89
High High 89

Compressor

revolution

(rps)

NOTE :

Model of Indoor unit 10 : RAS-M10YKCV-E, 13 : RAS-M13YKCV-E, 16 : RAS-M16YKCV-E

NOTES :

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

(Thermistor themometer)

(2) Connecting piping condition : 5 meters x 3 units (5m / each unit)

– 21 –

7-1. Indoor Unit

– 22 –

Heat Exchanger Sensor

Temperature Sensor

Infrared Rays Signal Receiver

Remote Control

Operation (START/STOP)

Operation Mode Selection

AUTO, COOL, DRY, FAN ONLY

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

Infrared

Rays

Indoor Unit Control Panel

Initializing Circuit

Clock Frequency
Oscillator Circuit

Power Supply

Circuit

Noise Filter

M.C.U

Functions

• Louver Control

• 3-minute Delay at Restart for Compressor

• Motor Revolution Control

• Processing
(Temperature Processing)

• Timer

• Serial Signal Communication

Louver ON/OFF Signal

Operation

Display

Timer

Display

ECONO.

Sign Display

FAN-ONLY

Sign Display

Indoor

Fan Motor

7. CONTROL BLOCK DIAGRAM

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

ECONO.

From Outdoor Unit

Louver Driver

Serial Signal Transmitter/Receiver

Serial Signal Communication

Louver

Motor

For Indoor unit

220–230–240V ~ 50Hz

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

7-2. Outdoor Unit (Inverter Assembly)

– 23 –

A unit

send/receive

circuit

Discharge
temp. sensor

Gas side
A, B, C pipe
temp. sensor

Outdoor air
temp. sensor

B unit

send/receive

circuit

C 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.

C 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

DC)

(AC

Over current

detect circuit

Rotor position

detect circuit

Over current
detect circuit

Gate drive

Over current

sensor

Over current

sensor

circuit

Rotor position

detect circuit

Gate drive

circuit

Inverter

(DC AC)

Inverter

(DC AC)

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 frequenc y of the supply po wer
from inverter to compressor is two-times
cycles of the actual number of rev olution.

(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 opera-

tion 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 opera-

tion revolution control

(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 emper ature of indoor heat exchanger b y indoor

heat exchanger sensor
(Minimum rev olution control)



to judgment of serial



signal from indoor
side.



– 24 –