Toshiba RAS-M10UKCV-E, RAS-M13UKCV-E, RAS-M16UKCV-E, RAS-3M23YACV-E Service Manual

SERVICE MANUAL

FILE NO. SVM-03016

AIR-CONDITIONER

SPLIT TYPE

RAS-M10UKCV-E, RAS-M13UKCV-E, RAS-M16UKCV-E /

RAS-3M23YACV-E

R410A

June, 2003

– 2 –

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 ..................................................................................... 36

10. HOWTO DIA GNOSE THE TROUBLE........................................................................... 50

11. HOW TO REPLACETHE MAIN PARTS........................................................................ 71

12. EXPLODED VIEWS AND PARTS LIST ........................................................................ 82

– 3 –

1. SPECIFICATIONS

1-1. Specifications

• 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 improvement.

RAS-M10UKCV-E, RAS-M13UKCV-E, RAS-M16UKCV-E

RAS-3M23YACV-E

6,7

2,2~7,0

220–240V–1Ph–50Hz

220V 230V 240V

RAS-M10UKCV-E, RAS-M13UKCV-E, RAS-M16UKCV-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-M10UKCV-E RAS-M13UKCV-E RAS-M16UKCV-E

36 39 42
33 35 39

28 28 33

RAS-3M23YACV-E

45
48

RAS-M10UKCV-E RAS-M13UKCV-E RAS-M16UKCV-E

275275275
790 790 790

208 208 208

10 10 10

19 19 19

470 520 600

RAS-3M23YACV-E

695
780
270

48
40

2100

Flare connection

RAS-M10UKCV-E RAS-M13UKCV-E RAS-M16UKCV-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

1

1

2 (Ø3,1 x 16L)

1
1
2

6 (Ø4 x 25L)

1
1
1

Unit model Indoor

Outdoor
Cooling capacity (kW)
Cooling capacity range (kW)
Power supply
Electric

characteristics

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)
COP
Operating noise Indoor Unit model

High (dB•A)
Medium (dB•A)
Low (dB•A)

Outdoor Unit model

10-1 unit operating (dB•A)

3 units operating (dB•A)

Indoor unit Unit model

Dimension Height (mm)

Width (mm)

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

Outdoor unit Unit model

Dimension Height (mm)

Width (mm)

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

Piping connection Type

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)

Refrigerant Name of refrigerant

Weight (kg)

Wiring connection Power supply

Interconnection

Usable temperature range Indoor (°C)

Outdoor (°C)

Accessory Indoor unit Installation plate

Wireless remote control

Label

Remote control holder

Pan head wood screw

Purifying filter

Zeodorizing filter

Batteries

Mounting screw

Installation manual
Outdoor unit Installation manual

Owner's manual

– 4 –

• 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-M10UKCV-E, 13 : RAS-M13UKCV-E, 16 : RAS-M16UKCV-E

Operating

Power

status

supply

(V)

1 unit 220

230
240
220
230
240
220
230
240

2 units 220

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

3 units 220

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)

1-2.

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

– 5 –

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

1-2-1. Operation Characteristic Curve

12
11
10

9
8
7
6
5
4
3
2
1
0

100 2030405060708090100

Inverter output frequency (rps)

Current (A)

• Conditions
Indoor : DB27˚C/WB19˚C
Outdoor : DB35˚C
Air flow : High
Pipe length 5m × 3
3 units operating

220V

240V

230V

105115

110

100

105

100

95

90

85

0

95
90
85
80
75
70
65
60
55
50

32 34 36 38 40 42 44 4614 16

4318 20 22 24

Outdoor temp. (˚C)

* Capacity ratio : 100% = 6,7 kW

Indoor air wet bulb temp. (˚C)

Capacity ratio (%)

Capacity ratio (%)

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

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

Current Limited Start

– 6 –

DB WB

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

NOTE :

Model of Indoor unit 10 : RAS-M10UKCV-E, 13 : RAS-M13UKCV-E, 16 : RAS-M16UKCV-E
MCA : Minimum Circuit Amps .
ICF : Maximum Instantaneous Current Flow

(Equivalent to MCA in case of inverter air conditioner)
MOCP : Maximum Ov ercurrent Protection (Fuse only)
MSC : Maximum Starting Current
FLA : Full Load Amps.

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

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

Voltage range Power supply

Hz

Volts-

Min. Max. MCA ICF

MOCP

Ph.

(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

50 220-1 198 264

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

50 230-1 198 264

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

50 240-1 198 264

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

1-3. Electrical Data

– 7 –

2. REFRIGERANT R410A

(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 ma y 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 shoc k, 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 may 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 valv e 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. Ne ver use copper
pipes thinner than 0,8 mm even when it is
available on the mark et.

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 f or 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 for the refriger ant
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.

– 8 –

(2) Joints

For copper pipes, flare joints or soc k et 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 Tables 2-2-3 ~ 2-2-6
below .

b) Socket Joints

Socket joints are such that they are br azed
for connections, and used mainly for thick
pipings whose diameter is larger than 20 mm.
Thicknesses of socket joints are as sho wn in
T ab le 2-2-2.

T able 2-2-2 Minimum thicknesses of socket joints

Nominal diameter

Reference outer diameter of Minimum joint thickness

copper pipe jointed (mm) (mm)

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

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

– 9 –

A

ØD

Flare nut

width

(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

T able 2-2-3 Dimensions related to flare pr ocessing for R410A

Nominal

Outer

Thickness

diameter

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

A (mm)

Flare tool for

Conventional flare tool

R410A clutch type

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

Table 2-2-4 Dimensions related to flare processing for R22

Nominal

Outer

Thickness

diameter

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

A (mm)

Flare tool for

Conventional flare tool

R22 clutch type

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

T able 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

Dimension (mm)

ABCD

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

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.

– 10 –

43˚

~

45˚

45˚

~

46˚

B A

C

D

Flare nut

width

(mm)

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

Dimension (mm)

ABCD

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

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 .

When it is strong, the flare nut may crack and
may be made non-removab le . 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.

Table 2-2-7 Tightening tor que of flare f or R410A [Reference v alues]

Nominal Outer diameter Tightening torque

Tightening torque of torque

wrenches available on the market

diameter (mm) N•m (kgf•cm)

N•m (kgf•cm)

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

T able 2-2-6 Flare and flare nut dimensions for R22

– 11 –

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

Tools whose specifications are changed for R410A and their interchangeability

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

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

R410A air conditioner

installation

Existence of Whether
new equipment conventional
for R410A equipment can

be used

Yes

*

(Note 1)

Yes

*

(Note 1)

Yes

X

Yes

X

Yes

X

Yes

X

Yes

X

Yes

X

(Note 2)

X

Conventional air

conditioner installation

Whether new equip­ment can be used with
conventional refriger­ant

¡

*

(Note 1)

X
X

¡
¡

X

¡

X

(Note 1) When flaring is carried out for R410A using the con v 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.

General tools (Conventional tools can be used.)

In addition to the above exclusiv 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

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

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

(Opposite side 5mm)

(11) Tape measure
(12) Metal saw

Also prepare the following equipments for other installation method and run chec k.

(1) Clamp meter
(2) Thermometer

(3) Insulation resistance tester
(4) Electroscope

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 following three types.

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

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

– 12 –

(INDOOR unit)

(Liquid side)

Refrigerant cylinder

(With siphon pipe)

Check valve

(Gas side)

Open/Close valve

for charging

Electronic balance for refrigerant charging

Opened

(OUTDOOR unit)

Closed

Service port

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

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

(For refrigerant charging, see the figure below.)

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.

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.

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.



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.
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 .

Fig. 2-4-1 Configuration of refrigerant charging

2-4. Recharging of Refrigerant

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

– 13 –

Gauge manifold

[ Cylinder with siphon ] [ Cylinder without siphon ]

OUTDOOR unit

Gauge manifold

OUTDOOR unit

Refrigerant

cylinder

Electronic

balance

Refrigerant

cylinder

Electronic

balance

Siphon

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.

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.

Fig. 2-4-2

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 allo y of tin and lead. Since it is
weak in adhesive strength, do not use it for
refrigerant pipes.



Phosphor bronze brazing filler tends to react
with sulfur and produce a fragile compound
water solution, which may cause a gas leak­age. Therefore, use an y 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.



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.

– 14 –

Nitrogen gas

cylinder

Pipe

Flow meter

M

Stop valve

From Nitrogen cylind

er

Nitrogen
gas

Rubber plug

Piping

material

Copper - Copper

Copper - Iron

Iron - Iron

Used brazing Used

filler flux

Phosphor copper Do not use

Silver Paste flux
Silver Vapor flux



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 water).



Remove the flux after brazing.

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 prevent the oxide 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 backflo 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 m

3

/Hr or 0,02 MPa (0,2kgf/

cm2) by means of the reducing valve.



After performing the steps above, k eep 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.

Fig. 2-5-1 Prevention of o xidation during brazing

(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

–15 –

3. CONSTRUCTIONVIEWS

3-1. Indoor Unit

Connecting pipe (0.33m)
(For 10,13 series ; Flare ∅9.52

For 16 series ; Flare ∅12.7)

Knock out system

Back body

Front panel

Air outlet

Air inlet

Air filter

Heat exchanger

Knock out system

660

275

790

208

48

48

26

4519040

32

64

590

320

620

235 235

215 215

9090

275

45

150150 160160

120 80

53

660

Hanger

Hanger

Hanger

Hanger

Hanger

Drain hose (0.54m)

Connecting pipe (0.43m)

(Flare ∅6.35)

For stud bolt
(∅8~∅10)

For stud bolt (∅6)

Installation plate outline

Center line

Minimum
distance
to ceiling

170 or more

Minimum
distance
to ceiling

170 or more

65 or more

Minimum
distance
to ceiling

Wireless remote control

57 18

160

RAS-M10UKCV-E, RAS-M13UKCV-E, RAS-M16UKCV-E

– 16 –

3-2. Outdoor Unit

RAS-3M23YACV-E

115,5

780

68,5

Fan
guard

(For ø8-ø10 anchor bolt)

ø11 × 17U-shape hole

8-ø6 hole
(For fixing outdoor unit)

ø11 × 17 long hole

(For ø8-ø10 anchor bolt)

90

50

600

310

296

270

18

B leg part

(ø6 hole pitch)

(Anchor bolt long hole pitch)

A leg part

2-ø6 hole

2-ø6 hole

600

50

11

R15

36

310

296

600

50

11

R15

36

310

296

R5,5

R5,5

Detailed A leg part

Detailed B leg part

Outside line
of product

Outside line
of product

600

310

B

C

A

D

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

Mounting dimensions of anchor bolt

50 or more

Intake

Intake

100 or
more

250 or more

200 or more

(Minimum distance
from wall)

Outside line
of product

Outlet

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

8

687

695

Hanger

123,8

332

86,2

53 53 53

53 53

Z

Charging
port

Valve
cover

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

Connecting pipe port

(Pipe dia.ø6,35)

Connecting pipe port

(Pipe dia.ø9,52)

Connecting pipe port

(Pipe dia.ø12,7)

view

Z

– 17 –

4. WIRING DIAGRAM

4-1. Indoor Unit

RAS-M10UKCV-E
RAS-M13UKCV-E
RAS-M16UKCV-E

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.(Check the primary and secondary voltage of transformer.)

Check for power supply voltage between



and



.(Refer to the name plate.)
(Check the primary and secondary voltage of transformer.)
Check for fluctuate voltage between

–

. (DC 15 ~ 60V)

Check to see if the fuse blows out.
(Checkthe R04 of the varistor.)

Check the voltage at the No.4 pin on CN13 connector of the infrared receiver.
(Check the transformer and the power supply circuit of the rated voltage.)

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

Check the voltage at the No.1 pin on CN10 connector.
(Check the DB01, R05 and C03.)

Refer to the service data for the detailed failure diagnosis.

Check items

OPERATION

INDICATOR

TERMINAL
BLOCK

FUSE

6.3A

DC 5V

DC 12V
DC 35V

1
2

3
4
5
6

Color

Identification

BRW : BROWN

RED : RED

WHI : WHITE
YEL : YELLOW

BLU : BLUE

BLK : BLACK
GRY : GRAY
PNK : PINK

ORN : ORANGE

GRN : GREEN &

&YEL YELLOW

(DC310 ~ 340V)

GRN : GREEN

– 18 –

4-2. Outdoor Unit

RAS-3M23YACV-E

REACTOR

11
22

COLOR IDENTIFICATION

BLK : BLACK
BLU : BLUE

ORN : ORANGE

GRY : GRAY
PNK : PINK

WHI : WHITE

BRW : BROWN

RED : RED

YEL : YELLOW

PUR : PURPLE

GRN : GREEN

SKB : SKY-BLUE

CN08

P.M.V.

A UNIT

POWER
SUPPLY

220–230–240V~

50Hz

SURGE

ABSORBER

CN300

FAN MOTOR

P.C. BOARD

MCC-758

REACTOR

CN301

CT

CONVERTER

MODULE

IGBT MODULE

ELECTRONIC

STARTER

POWER RELAY

G

E
A
~
–
~
+

+

BU
EU
BV
EV

BW
EW

BX
BY
BZ

–

C15C13

C14C12

P07P08

ORN P10

YEL

DB01

P20

BLU

Q200

P18
P17

P19

P09

P06

F01
FUSE
25A

VARISTOR

To

INDOOR

UNIT

A

To

INDOOR

UNIT

B

TD

WHI

YEL

ORN

BLU

RED

GRY

P.M.V.

B UNIT

WHI

YEL

ORN

BLU

RED

GRY

ORN

PNK

WHI

CN501

P12
P13

P11

P14

YEL
YEL

PUR

CN704

BLKBLK

PNK

YEL

RED

WHI

BLK

GRY

P04

RED

P05

WHI

BRW

RED

ORN

YEL

BLK

BRW
RED
ORN
YEL

P06

CN15

P02

GRY

ORN

BLK

BLK

BLK

BLK

BLK

P01

L

321

321

123

1234455

221

1

N 1 2 3 1 2 3

~ ~ ~ ~~~ ~ ~ ~ ~ ~

P03

1 1
2 2

CN02

CN03

CN05

CN14

CN13

1 1
2 2
3 3

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

P.M.V. : PULSE MODULATING VALVE

P.M.V.

C UNIT

WHI

YEL

ORN

BLU

RED

GRY

CN12

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

THERMOSTAT for COMPRESSOR

PHOTO

COUPLER

F03
FUSE
15A

F04
FUSE
3,15A

F01

FUSE 6,3A

313

1

4

3

2

1

4

3

2

1

4

3

2

1

TO

YEL

TGa

CN06

1 1
2 2
3 3

BRW

TGb

CN07

1 1
2 2
3 3

GRN

TGc

RELAY

BLKP23

WHIP22

REDP21

FM

To

INDOOR

UNIT

C

1 2 3 4

~ ~ ~ ~

SUB

P.C. BOARD

MCC-775

3

2

1

3

2

1

COMPRESSOR

CM

REACTOR

REACTOR

– 19 –

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) ICF-340-30-2 DC340V, 30W
2 Ther mo. sensor (TA-sensor) ( – ) 10kΩ at 25°C
3 DC-DC transformer (T01) SWT-70 DC390V, Secondar y DC15V, 12V, 7V

4 Microcomputer ( – )
5

Heat exchanger sensor

( – ) 10kΩ at 25°C

(TC-sensor)
6 Line filter (L01) SS11V-06270 27mH, AC0,64A
7 Diode (DB01) D3SBA60 4A, 600V
8 Capacitor (C03) KMH450VNSN120M25C 120µF, 450V
9 Fuse (F01) FCU250V3.15A T3,15A, 250V

10 Power supply IC (IC01) STR-L472
11 Varistor (R21, R109) 15G561K 560V
12 Resistor (R01) RF-5TK5R6 4,7Ω,5W
13 Louver motor MP24GA Output (Rated) 1W, 1 6poles, 1phase DC12V

5-2. Outdoor Unit

RAS-3M23YACV-E

No. Parts name Model name Rating

1 SC coil (Noise filter)

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

SC-20-01J 20A, 150µH

Primary side DC280V

2 DC-DC transformer SWT-43 Secondary side 7,5V x 1, 13V x 1

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

Coil DC12V
Contact AC125V, 3A

6

Discharge temp. sensor

(Inverter attached) 62kΩ (20°C)

(TD sensor)

7

Outside air temp. sensor

(Inverter attached) 10kΩ (25°C)

(TO sensor)

8

Temp. sensor at A room

(Inverter attached) 10kΩ (25°C)

gas side (TGa sensor)

9

Temp. sensor at B room

(Inverter attached) 10kΩ (25°C)

gas side (TGb sensor)

10

Temp. sensor at C room

(Inverter attached) 10kΩ (25°C)

gas side (TGc sensor)

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

For protection of

3,15A, AC250V

switching power source

12 Fuse

For protection of transistor

15A, AC250V

module breakage

For protection of

25A, AC250V

inverter input overcurrent

13 Electrolytic capacitor

LLQ2G501KHUATF

500µF, DC400V X 4 pieces

400LISN500K35F
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

– 20 –

6. REFRIGERANT CYCLE DIAGRAM

6-1. Refrigerant Cycle Diagram

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.

Connecting pipe
Thickness : 0,8 mm

Ø9,52 :
RAS-M10UKCV-E
RAS-M13UKCV-E

Ø12,7 :
RAS-M16UKCV-E

NOTE :

Gas leak check position
Refrigerant flow

INDOOR UNIT A

T1

Temp. measurement

To

C room

To

B room

Indoor heat

exchanger

Cross flow fan

Sectional shape
of heat insulator

To

C room

To

B room

Allowable height

difference : 10m

Allowable pipe length

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

Total
Max. : 40m

P

Strainer

Pulse modulating
valve at liquid side
(SEV15RC2)

TGa

TGb

TGc

TD

Accumulating tank
Ø51 x 300
(460cc)

Compressor
DA130A1F-21F

T

2

Outdoor heat

exchanger

Temp. measurement

Propeller fan

Refrigerant amount : 1,5kg (R410A)

OUTDOOR UNIT

Connecting pipe

Thickness : 0,8 mm

Ø6,35

Pressure
measurement

Gauge attaching port
Vacuum pump
connecting port

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

– 21 –

6-2. Operation Data

NOTE :

Model of Indoor unit 10 : RAS-M10UKCV-E, 13 : RAS-M13UKCV-E, 16 : RAS-M16UKCV-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)

Temperature

No. of

condition (°C)

operating

Indoor Outdoor

units

1 unit

2 units

27/19 35/–

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

Surface temp. of

pressure

heat exchanger

P (Mpa)

T1 (°C) T2 (°C)

0,92 11 42
0,85 9 47
0,73 8 50
0,96 10,5 to 11,5 4 9
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 5 1
0,98 12 to 13 52
0,98 12 to 13 52
0,98 12 to 13 52

Fan speed

Compressor

revolution

Indoor Outdoor

(rps)

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

– 22 –

7. CONTROL BLOCK DIAGRAM

7-1. Indoor Unit

Remote Control

Operation (START/STOP)

Operation Mode Selection

AUTO, COOL, DRY, FAN ONLY

Temperature Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver Auto Swing

Louver Direction Setting

ECONO.

Infrared

Rays

REMOTE CONTROL

Indoor Unit Control Panel

Heat Exchanger Sensor

Temperature Sensor

Infrared Rays Signal Receiver

Initiallizing Circuit

Clock Frequency
Oscillator Circuit

Power Supply

Circuit

Noise Filter

From Outdoor Unit

M.C.U.

Functions

• Louver Control

• 3-minute Delay at Restart for Compressor

• Motor Revolution Control

• Processing

(Temperature Processing)

• Timer

Louver ON/OFF Signal

Louver Driver

Relay RY04

Outdoor Unit

Operation

Display

Timer

Display

Filter Sign

Display

Indoor Fan

Motor

Fan Only

Sign Display

Louver Motor

Infrared

Rays

Remote

Control

Outdoor unit

ON/OFF Signal

Relay Driver

RAS-M10UKCV-E, RAS-M13UKCV-E, RAS-M16UKCV-E

– 23 –

7-2. Outdoor Unit (Inverter Assembly)

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

220–230–240V ~ 50Hz

For Indoor unit

Outdoor air

temp. sensor

Discharge

temp. sensor

Gas side

A, B, C pipe

temp. sensor

C unit

send/receive

circuit

A unit

send/receive

circuit

B unit

send/receive

circuit

Compressor

Outdoor

fan motor

• PWM synthesis function

• Input current release control

• IGBT over-current detect control

• Outdoor fan control

• High power factor correction control

• Signal communication to MCU

M.C.U

Input current

Sensor

Over current

sensor

Over current

sensor

Converter

(AC

DC)

Inverter

(DC

AC)

Inverter

(DC

AC)

Noise

filter

High power factor

correction circuit

Over current

detect circuit

Over current

detect circuit

Rotor position

detect circuit

Rotor position

detect circuit

Gate drive

circuit

Gate drive

circuit

• Inverter output frequency control

• A/D converter function

• P.M.V. control

• Discharge temp. control

• Error display

• Signal communication to MCU

M.C.U

Driver circuit of P.M.V.

C unit

P.M.V.

P.M.V. : Pulse Modulating Valve

PWM : Pulse Width Modulation

IGBT : Insulated Gate Bipolar Transistor

A unit

P.M.V.

B unit

P.M.V.

– 24 –

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 power
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
control

• Operation control of
outdoor fan motor

• P.M.V . control





Operations followed
to judgment of serial
signal from indoor
side.

• 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

(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 v alue.

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

– 25 –

(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 transferring 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 power
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 by
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 ex­change inverter output voltage and supply power
winding.

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

T able 8-1-1 Compressor re volution range

No. of Combination of Compressor

operating unit indoor units revolution (rps)

RAS-M16UKCV-E 16 to 77

1 unit RAS-M13YKCV-E 16 to 72

RAS-M10YKCV-E 16 to 45

2 units

¡

*

19 to 84

3 units

¡

*

23 to 92

*

: In case that any multiple indoor units are combined.

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

Pow er factor improvement control is performed
mainly aiming to reduce the current on much power
consumption of cooling operation. Controlling starts
from the time when input power has reached at a
certain point. To be concrete, IGBT of the power
factor improv ement circuit is used, and the po wer
factor is improv ed by keeping IGBT on for an arbi­trary period to widen electro-angle of the input
current.

8-1-4. Prevent-Freezing 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 three 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 valv e . In this case,
ticktack sound may be heard.

– 26 –

8-1-6. Louver Control

(1) Vertical air flow louvers

Positions of vertical air flow louv ers are auto­matically controlled according to the operation
status (COOL, AUTO, DRY, FAN ONLY). 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 [AUT O] b utton is pressed during running
operation, vertical air flow louvers start swinging.
When the [AUT O] 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 8-1-3. It is not selected by relay, so selecting
sound does not generate.

T able 8-1-3

NOTE : UL : Ultra Low, SUL : Super Ultra Low

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

Although the outdoor fan motor drives the outdoor f an b y non-step v ariable 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 f an 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.

T able 8-1-4

Compressor revolution (rps)

~

17,4

~

38,9 39

~

Outdoor temp. sensor

TO ≥ 38°C 500 (rpm) 800 (rpm) 800 (rpm)

TO

38°C > TO ≥ 15°C 500 (rpm) 700 (rpm) 800 (rpm)
15°C > TO 390 (rpm) 390 (rpm) 390 (rpm)
TO ≥ 38°C 500 (rpm) 700 (rpm) 800 (rpm)

ECONO. operation 38°C > TO ≥ 15°C 500 (rpm) 500 (rpm) 700 (rpm)

15°C > TO 390 (rpm) 390 (rpm) 390 (rpm)

TO is abnormal 700 (rpm) 700 (r pm) 800 (rpm)

Remote

Motor speed

ir flow rate Motor speed

ir flow rate Motor speed Air flow rate

mode mode Control

( rpm )

( m

/h )

( rpm )

( m

/h )

( rpm )

( m

/h )

H HIGH 1190 560 1210 590 1350 670
M 1080 510 1130 530 1250 610

MED 1100 510 1130 530 1250 610

M MED 1000 460 1050 490 1150 550

LOW 960 440 990 460 1070 500
L 950 430 950 430 1050 490
L LOW 910 400 910 400 980 450
L 850 370 850 370 920 410
L 950 430 950 430 1050 490
L 910 400 910 400 980 450
L 850 370 850 370 920 410

UL 720 300 750 310 920 410

SUL 660 260 700 280 800 340

RAS-M13UKCV-E RAS-M16UKCV-E

DRY

Cooling

and Fan

only

RAS-M10UKCV-E

FanOperation

+

-

+

-

+

+

+