Toshiba RAS-B13U2FVG-TR, RAS-B18U2FVG-TR, RAS-B18U2FVG-E, RAS-25U2FVG-ND, RAS-25U2AVPG-ND Service Manual

SERVICE MANUAL

SPLIT TYPE

Indoor Unit

<Console

, Heat Pump Type>

RAS-B10

U2FVG-E,-TR

RAS-B13

U2FVG-E,-TR

RAS-B18

U2FVG-E,-TR

May, 2018

R32

FILE NO. SVM-18048

CONTENTS

1. SAFETY PRECAUTIONS .......................................................................... 3

2. SPECIFICATIONS ..................................................................................... 7

3. REFRIGERANT R410A ............................................................................. 9

4. CONSTRUCTION VIEWS ........................................................................ 17

5. WIRING DIAGRAM .................................................................................. 18

6. SPECIFICATIONS OF ELECTRICAL PARTS ......................................... 19

7. REFRIGERANT CYCLE DIAGRAM ........................................................ 20

8. CONTROL BLOCK DIAGRAM ................................................................ 22

9. OPERATION DESCRIPTION................................................................... 23

10.

INSTALLATION PROCEDURE ................................................................ 57

11.

HOW TO DIAGNOSE THE TROUBLE...................................................... 65

12.

HOW TO REPLACE THE MAIN PARTS................................................... 88

13.

EXPLODED VIEWS AND PARTS LIST ................................................... 95

FILE NO. SVM-18048

- 2 -

1. SAFETY PRECAUTIONS

FILE NO. SVM-18048

- 3 -

SAFETY PRECAUTIONS

The important contents concerned to the safety are described on the product itself and on this Service Manual.
Please read this Service Manual after understanding the described items thoroughly in the following contents
(Indications/Illustrated marks), and keep them.

[Explanation of indications]

Indication Explanation

DANGER

WARNING

CAUTION

* Property damage : Enlarged damage concerned to property, furniture, and domestic animal/pet

Indicates contents assumed that an imminent danger causing a death or serious injury of the
repair engineers and the third parties when an incorrect work has been executed.

Indicates possibilities assumed that a danger causing a death or serious injury of the repair
engineers, the third parties, and the users due to troubles of the product after work when an
incorrect work has been executed.

Indicates contents assumed that an injury or property damage (*) may be caused on the repair
engineers, the third parties, and the users due to troubles of the product after work when an
incorrect work has been executed.

[Explanation of illustrated marks]

Mark Explanation

Indicates prohibited items (Forbidden items to do)
The sentences near an illustrated mark describe the concrete prohibited contents.

Indicates mandatory items (Compulsory items to do)
The sentences near an illustrated mark describe the concrete mandatory contents.

Indicates cautions (including danger/warning)
The sentences or illustration near or in an illustrated mark describe the concrete cautious contents.

For general public use

Power supply cord of outdoor unit shall be more than 1.5 mm2 (H07RN-F or 60245IEC66) polychloroprene
sheathed flexible cord.

• Read this “SAFETY PRECA UTIONS” carefully before servicing.

• The precautions described below include the important items regarding safety. Observe them without fail.

• After the servicing work, perform a trial operation to check for any problem.

• Turn off the main power supply switch (or break er) before the unit maintenance.

• THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R32) WHICH DOES NOT
DESTROY OZONE LAYER.

R32 refrigerant is apt to be affected by impurities such as water, oxidizing membrane, and oils because the
working pressure of R32 refrigerant is approx. 1.6 times of refrigerant R22. Accompanied with the adoption
of the new refrigerant, the refrigeration machine oil has also been changed. Therefore, during installation
work, be sure that water, dust, former refrigerant, or refrigeration machine oil does not enter into the new
type refrigerant R32 air conditioner circuit.

To prevent mixing of refrigerant or refrigerating machine oil, the sizes of connecting sections of charging
port on main unit and installation tools are different from those used for the conventional refrigerant units.

Accordingly, special tools are required for the new refrigerant (R32) units. For connecting pipes, use new
and clean piping materials with high pressure fittings made for R32 only, so that water and/or dust does not
enter. Moreover, do not use the existing piping because there are some problems with pressure fittings and
possible impurities in existing piping.

CAUTION

TO DISCONNECT THE APPLIANCE FROM THE MAIN POWER SUPPLY

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

■

Important information regarding the refrigerant used

This product contains fl uorinated greenhouse gases covered by the Kyoto Protocol. Do not vent gases into
the atmosphere. Refrigerant type: R32

GWP

(1)

value: 675*

(1)

GWP = global warming potential

The refrigerant quantity is in dicated on the unit name plate.
* This value is based on F gas regulation 517/2014

CAUTION

CAUTION

New Refrigerant Air Conditioner Installation

Read the precautions in this manual
carefully before operating the unit.

This appliance is fi lled with R32.
(Flammable Material)

Information included in the Operation
Manual and/or Installation Manual.

Service personnel should be handing this equipment
with reference to the Installation Manual.

FILE NO. SVM-18048

- 4 -

• ASK AN AUTHORIZED DEALER OR QUALIFIED INSTALLATION PROFESSIONAL TO IN-

STALL/MAINTAIN THE AIR CONDITIONER.

INAPPROPRIATE SERVICING MAY RESULT IN WATER LEAKA GE, ELECTRIC SHOCK OR FIRE.

• TURN OFF MAIN POWER SUPPLY BEFORE ATTEMPTING ANY ELECTRICAL WORK. MAKE SURE

ALL POWER SWITCHES ARE OFF. FAILURE TO DO SO MAY CAUSE ELECTRIC SHOCK.

DANGER: HIGH VOLTAGE

The high voltage circuit is incorporated.
Be careful to do the check service, as the electric shock may be caused in case of touching parts

on the P.C. board by hand.

• CORRECTLY CONNECT THE CONNECTING CABLE. IF THE CONNECTING CABLE IS INCOR-

RECTLY CONNECTED, ELECTRIC PARTS MAY BE DAMAGED.

• CHECK THAT THE EARTH WIRE IS NOT BROKEN OR DISCONNECTED BEFORE SERVICE AND

INSTALLATION. FAILURE TO DO SO MAY CAUSE ELECTRIC SHOCK.

DANGER

• DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OR GAS VAPORS. FAILURE

TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR EXPLOSION.

• TO PREVENT THE INDOOR UNIT FROM OVERHEATING AND CAUSING A FIRE HAZARD, PLACE

THE UNIT WELL AWAY (MORE THAN 2 M) FROM HEAT SOURCES SUCH AS RADIATORS, HEAT
REGISTORS, FURNACE, STOVES, ETC.

• WHEN MOVING THE AIR-CONDITIONER FOR INSTALLATION IN ANOTHER PLACE, BE VERY CARE-

FUL NOT TO ALLOW THE SPECIFIED REFRIGERANT (R410A) TO BECOME MIXED WITH ANY
OTHER GASEOUS BODY INTO THE REFRIGERATION CIRCUIT. IF AIR OR ANY OTHER GAS IS
MIXED IN THE REFRIGERANT, THE GAS PRESSURE IN THE REFRIGERATION CIRCUIT WILL
BECOME ABNORMALLY HIGH AND IT MAY RESULT IN THE PIPE BURSTING AND POSSIBLE PER­SONNEL INJURIES.

• IN THE EVENT THAT THE REFRIGERANT GAS LEAKS OUT OF THE PIPE DURING THE SERVICE

WORK AND THE INSTALLATION WORK, IMMEDIATELY LET FRESH AIR INTO THE ROOM. IF THE
REFRIGERANT GAS IS HEATED, SUCH AS BY FIRE, GENERATION OF POISONOUS GAS MAY
RESULT.

WARNING

• Never modify this unit by removing any of the safety guards or bypass any of the safety interlock

switches.

• Do not install in a place which cannot bear the weight of the unit. Personal injury and property

damage can result if the unit falls.

• After the installation work, confirm that refrigerant gas does not leak.

If refrigerant gas leaks into the room and flows near a fire source, such as a cooking range, noxious gas
may generate.

• The electrical work must be performed by a qualified electrician in accordance with the Installation

Manual. Make sure the air conditioner uses an exclusive circuit.

An insufficient circuit capacity or inappropriate installation may cause fire.

• When wiring, use the specified cables and connect the terminals securely to prevent external

forces applied to the cable from affecting the terminals.

• Be sure to provide grounding.

Do not connect ground wires to gas pipes, water pipes, lightning rods or ground wires for telephone cables.

• Conform to the regulations of the local electric company when wiring the power supply.

Inappropriate grounding may cause electric shock.

• Manufacturer pay no responsibility to any damage, caused by heating cable, being outside of unit.

FILE NO. SVM-18048

- 5 -

•

•

•

Do not pierce or burn as the appliance is pressurized. Do not expose the appliance to heat, fl ame, sparks, or
other sources or ignition. Else, it may explode and cause injury or death.
For R32 model, use pipes, fl are nut and tools which is specifi ed for R32 refrigerant. Using of existing (R22)
piping, fl are nut and tools may cause abnormally high pressure in the refrigerant cycle (piping), and possibly
result in explosion and injury.
Thickness of copper pipes used R32 must be more than 0.8mm. Never use copper pipes thinner than 0.8mm.

Do not perform flare connection inside a building or dwelling or room, when joining the heat exchanger of
indoor unit with interconnection piping. Refrigerant connection inside a building or dwelling or room must be
made by brazing or welding. Joint connection of indoor unit by flaring method can only be made at outdoor or
at outside of building or dwelling or room. Flare connection may cause gas leak and flammable atmosphere.
After completion of installation or service, confirm there is no leakage of refrigerant gas. It may generate toxic
gas when the refrigerant contacts with fire.

•

•

• Appliance and pipe-work shall be installed, operated and stored in a room with a floor area large than A

min

m

2

How to get A

min

m2 : A

min

= (M / (2.5 x 0.22759 x h0))

2

M is the refrigerant charge amount in appliance in kg. h0 is the installation height of the appliance in m : 0.6 m
for floor standing/1.8m for wall mounted/1.0 m for window mounted/2.2 m for ceiling mounted.

• Comply with national gas regulations.

CAUTION

• E

xposure of unit to water or other moisture before installation may res

ult in an electrical short.

Do not store in a wet basement or expose to rain or water.

• Do not install in a place that can increase the vibration of the unit. Do not ins

tall in a place that can amplify

the noise level of the unit or where noise or dischar

ged air might disturb neighbors.

• T

o avoid personal injury

, be careful when handling parts with sharp edges.

• P

erform the specified installation work to guard against an earthquake.

If the air conditioner is not installed appropriately, ac

cidents may occur due to the falling unit.

For Reference:

If a heating operation would be continuously performed for a long time under the condition that the outdoor
temperature is 0°C or lower, drainage of defrosted water may be difficult due to freezing of the bottom
plate, resulting in a trouble of the cabinet or fan.

It is recommended to procure an antifreeze heater locally for a safe installation of the air conditioner.
For details, contact the dealer.

FILE NO. SVM-18048

- 6 -

2-1. Specifications

2. SPECIFICATIONS

Unit model Indoor

Outdoor

Cooling capacity (kW)

Cooling capacity range (kW)

Heating capacity (kW)

Heating capacity range (kW)

Power supply

Electric Indoor Operation mode

characteristic Running current (A)

Power consumption (W)

Power factor (%)

Outdoor Operation mode

Running current (A)

Power consumption (W)

Power factor (%)

Starting current (A)

COP (Cooling / Heating) 4.20

Operating Indoor High (Cooling / Heating) (dB-A)

noise Medium (Cooling / Heating) (dB-A)

Low (Cooling / Heating) (dB-A)

Outdoor (Cooling / Heating) (dB-A)

Indoor unit Unit model

Dimention Height (mm)

Width (mm)

Depth (mm)

Net weight (kg)

Fan motor output (W)

Air flow rate (Cooling / Heating)

(m

3

/ min)

Outdoor unit Unit model

Dimention Height (mm)

Width (mm)

Depth (mm)

Net weight (kg)

Compressor Motor output (W)

Type

Model

Fan motor output (W)

Air flow rate (Cooling / Heating)

(m

3

/ min)

Piping Type

connection Indoor unit Liquid side (mm)

Gas side (mm)

Outdoor unit Liquid side (mm)

Gas side (mm)

Maximum length (m)

Maximun charge-less length (m)

Maximum height difference (m)

Refrigerant Name of refrigerant

Weight (kg)

Wiring Power supply

connection Interconnection 4 Wires:Includes earth 4 Wires:Includes earth 4 Wires:Includes earth

Usable temperature range Indoor (Cooling / Heating)

(

o

C)

Outdoor (Cooling / Heating)

(

o

C)

Accessory Indoor unit Installation plate

Wireless remote controller
Batteries
Toshiba New IAQ Filter
Install screw
Remote controller holder
Pan head wood screw
for Remote control holder
Insulate pipe
Installation manual
Owner's manual

Outdoor unit Drain nipple

Water-proof rubber cap

* The specification may be subject to change without notice for purpose of improvement.

8

1

2

*

1

1

1

*

1

1

2

2

*

Cooling Heating

0.20-0.19 0.24-0.22

25 30

56 57

Cooling

1

1

1

*

2

1

1

2

2

8

1

∅6.35

∅9.52

Flare connection

R32

8

1

2

1

1

2

2

1

1

1

*
*

Cooling Heating

0.27-0.24 0.30-0.28

35 40

60 60

R32

21-32/0-28

-10-46/-15-24

∅6.35

∅12.7

Flare connection

220

16

41

10.0/10.7

600

700

3.01/3.21

46/46

40/40

34/34

8.49-7.78

Heating

1Ph/50Hz/220-240V

1Ph/60Hz/220-230V

Cooling

RAS-B13U2FVG-E,-TR

*

21-32/0-28

-10-46/-15-24

220

16

41

8.5/9.2

600

700

3.33-3.36

40/40

33/33

27/27

5.06-4.65

1Ph/50Hz/220-240V

1Ph/60Hz/220-230V

Heating

RAS-B13U2FVG-E,-TR

R32

21-32/0-28

-10-46/-15-24

∅6.35

∅9.52

Flare connection

220

16

41

7.8/8.5

600

700

4.20/4.27

39/39

32/32

26/26

54

Cooling

3.04-2.78

56

Heating

0.20-0.19

25

1Ph/50Hz/220-240V

1Ph/60Hz/220-230V

Cooling Heating

0.17-0.15

20

RAS-B10U2FVG-E,-TR

*

*

RAS-B13U2FVG-E,-TR

RAS-B13U2FVG-E,-TRRAS-B10U2FVG-E,-TR

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*
*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

* *
* *

* *
* *

*

*

*

*

*

*

*

* * * *

*

*

FILE NO. SVM-18048

- 7 -

2-2. Combined multi-split outdoor unit

The multi-split outdoor units, which can be combined with B**U2FVG series indoor unit are as described below:

Outdoor

unit type

B18U2FVG B13U2FVG B10U2FVG

X

2-room Multi

outdoor unit

X

X

3-room Multi

outdoor unit

4-room Multi

outdoor unit

5-room Multi

outdoor unit

: Combination available
X : Combination unavailable

This service manual describes about B**U2FVG series indoor units only.
For the multi-split outdoor unit to be combined, refer to the service manual.

Outdoor unit

SVM-18051
SVM-18052
SVM-18053

SVM-18020

RAS-2M18U2AVG-E,-TR

RAS-2M14U2AVG-E,-TR

RAS-5M34U2AVG-E,-TR

RAS-4M27U2AVG-E,-TR

RAS-3M26U2AVG-E,-TR

File name

Heat Pump Model

Combined outdoor unit

model name

Indoor unit model name

RAS-3M18U2AVG-E,-TR

X

X

RAS-2M18U2AVG-E,-TR

RAS-2M14U2AVG-E,-TR

RAS-5M34U2AVG-E,-TR

RAS-4M27U2AVG-E,-TR

RAS-3M26U2AVG-E,-TR

RAS-3M18U2AVG-E,-TR

RAS-2M10U2AVG-E,-TR

SVM-18005

RAS-2M10U2AVG-E,-TR

FILE NO. SVM-18048

- 8 -

3. REFRIGERANT R32

This air conditioner adopts the new refrigerant HFC
(R32) which does not damage the ozone layer.

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

3-1. Safety During Installation/Servicing

The basic installation servicing work procedures are
the same as conventional R410A models.

As R32’s pressure is about 1.6 times higher than that
of R22, improper installation/servicing may cause a
serious trouble. By using tools and materi-als exclusive
for R32, it is necessary to carry out installation/
servicing safely while taking the following precautions
into consideration.

1. Never use refrigerant other than R32 in an air
conditioner which is designed to operate with R32.
If other refrigerant than R32 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 refrigerant.
The refrigerant name R32 is indicated on the visible
place of the outdoor unit of the air conditioner using
R32 as refrigerant. To prevent mischarging, the
diameter of the service port differs from that of R22.

R32 and other HFCs are heavier than air, and
therefore they are inclined to settle near the floor
surface.
If the gas fills up the room or the bottom part of a
room, it may also cause oxygen deficiency and may
reach its combustion concentration.

In order to prevent oxygen deficiency and R32
combustion, keep the room well-ventilated for a
healthy work environment.

In particular, using HFCs in a basement room or
confined area creates a higher risk; be sure to
furnish the room with local exhaust ventilation.
If a refrigerant leak is confirmed in a room an
inadequately ventilated location, do not use a flame
until the area has been ventilated appropriately and
the work environment has been improved.
The same applies in case of brazing, ensure
appropriate ventilation to prevent oxygen deficiency
and R32 combustion.
Check that there are no dangerous or combustible
items nearby, and ensure a fire extinguisher is close
at hand.
Keep a sufficient distance away from causes of fire
(ignition sources) such as gas-burning equipment
and electric heaters in places where installation,
repairs, or similar work on air-conditioning
equipment is performed.

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 moisture dust or oil 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 level.
If the refrigerant gas leakage occurs and its
concentration exceeds the marginal level, 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 may result in water leakage,
electric shock and fire, etc.

3-2. Refrigerant Piping Installation

3-2-1. 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 blocked with contaminants.

As an air conditioner using R32 incurs pres-sure
higher than when using R22, it is necessary to
choose adequate materials.

Thicknesses of copper pipes used with R32 are as
shown in Table 3-2-1. Never use copper pipes
thinner than 0.8 mm even when it is available on
the market.

FILE NO. SVM-18048

- 9 -

Table 3-2-1 Thicknesses of annealed copper pipes

Nominal diameter

1/4

3/8

1/2

5/8

Outer diameter (mm)

6.35

9.52

12.70

15.88

Thickness (mm)

R32 R22

0.80 0.80

0.80 0.80

0.80 0.80

1.00 1.00

2. Joints

For copper pipes, flare joints or socket 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 3-2-3 to 3-2-6 below.

b) Socket Joints

Socket joints are such that they are brazed for connections, and used mainly for thick pipings whose
diameter is larger than 20 mm.

Thicknesses of socket joints are as shown in Table 3-2-2.

Table 3-2-2 Minimum thicknesses of socket joints

Nominal diameter

1/4

3/8

1/2

5/8

Reference outer diameter of

copper pipe jointed (mm)

6.35

9.52

12.70

15.88

Minimum joint thickness

(mm)

0.50

0.60

0.70

0.80

3-2-2. 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 than lubricating oils used in the installed air-water heat pump 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.

c) Insertion of Flare Nut

FILE NO. SVM-18048

- 10 -

A

ØD

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 R32 or conven­tional flare tool.

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. 3-2-1 Flare processing dimensions

Table 3-2-3 Dimensions related to flare processing for R32

Nominal

diameter

1/4

3/8

1/2

5/8

Outer

diameter

(mm)

6.35

9.52

12.70

15.88

Thickness

(mm)

0.8

0.8

0.8

1.0

A (mm)

Flare tool for R32

clutch type

0 to 0.5

0 to 0.5

0 to 0.5

0 to 0.5

Conventional flare tool

Clutch type Wing nut type

1.0 to 1.5 1.5 to 2.0

1.0 to 1.5 1.5 to 2.0

1.0 to 1.5 2.0 to 2.5

1.0 to 1.5 2.0 to 2.5

Table 3-2-4 Dimensions related to flare processing for R22

Nominal

diameter

1/4

3/8

1/2

5/8

Outer

diameter

(mm)

6.35

9.52

12.70

15.88

Thickness

(mm)

0.8

0.8

0.8

1.0

A (mm)

Flare tool for R22

clutch type

0 to 0.5

0 to 0.5

0 to 0.5

0 to 0.5

Conventional flare tool

Clutch type Wing nut type

0.5 to 1.0 1.0 to 1.5

0.5 to 1.0 1.0 to 1.5

0.5 to 1.0 1.5 to 2.0

0.5 to 1.0 1.5 to 2.0

Table 3-2-5 Flare and flare nut dimensions for R32

Nominal
diameter

1/4

3/8

1/2

5/8

Outer diameter

(mm)

6.35

9.52

12.70

15.88

Thickness

(mm)

0.8

0.8

0.8

1.0

Dimension (mm)

ABCD

9.1 9.2 6.5 13

13.2 13.5 9.7 20

16.6 16.0 12.9 23

19.7 19.0 16.0 25

Flare nut width

(mm)

17

22

26

29

FILE NO. SVM-18048

- 11 -

43° to 45°

45° to 46°

B A

C

D

Table 3-2-6 Flare and flare nut dimensions for R22

Nominal
diameter

1/4

3/8

1/2

5/8

3/4

Outer diameter

(mm)

6.35

9.52

12.70

15.88

19.05

Thickness

(mm)

0.8

0.8

0.8

1.0

1.0

Dimension (mm)

ABCD

9.0 9.2 6.5 13

13.0 13.5 9.7 20

16.2 16.0 12.9 20

19.7 19.0 16.0 23

23.3 24.0 19.2 34

Flare nut width

(mm)

17

22

24

27

36

Fig. 3-2-2 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 R32 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-removable. When choosing the tighten­ing torque, comply with values designated by manufacturers. Table 3-2-7 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 3-2-7 Tightening torque of flare for R32 [Reference values]

Nominal
diameter

1/4

3/8

1/2

5/8

Outer diameter

(mm)

6.35

9.52

12.70

15.88

Tightening torque

N•m (kgf•cm)

14 to 18 (140 to 180)

33 to 42 (330 to 420)

50 to 62 (500 to 620)

63 to 77 (630 to 770)

Tightening torque of torque

wrenches available on the market

N•m (kgf•cm)

16 (160), 18 (180)

42 (420)

55 (550)

65 (650)

FILE NO. SVM-18048

- 12 -

Tools exclusive for R410A (The following tools for R32 are required.)

Tools whose specifications are changed for R32 and their interchangeability

No.

1

2

3

4

5

6

7

8

9

10

Used tool

Flare tool

Copper pipe gauge for
adjusting projection
margin

Torque wrench
(For Ø12.7)

Gauge manifold

Charge hose

Vacuum pump adapter

Electronic balance for
refrigerant charging

Refrigerant cylinder

Leakage detector

Charging cylinder

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

R32

air-water heat pump installation

Existence of
new equipment
for R32

Ye s

Ye s

Ye s

Ye s

Ye s

Ye s

Ye s

Ye s

(Note 2)

Whether conven­tional equipment
can be used

*(Note 1)

*(Note 1)

×

×
×

×
×

×
×

Conventional air-water
heat pump installation

Whether new equipment
can be used with
conventional refrigerant

¡

*(Note 1)

×

×

¡

¡

×

¡

×

(Note 1) When flaring is carried out for R32 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 R32 is being currently developed.

General tools (Conventional tools can be used.)

In addition to the above exclusive 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, Ø9.52)

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 4mm)

11. Tape measure

12. Metal saw

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

1. Clamp meter

2. Thermometer

3. Insulation resistance tester

4. Electroscope

3-3. Tools

3-3-1. Required Tools

The service port diameter of packed valve of the outdoor unit in the air-water heat pump using R32 is
changed to prevent 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. Tools exclusive for R32 (Those which cannot be used for conventional refrigerant (R22))

2. Tools exclusive for R32, but can be also used for conventional refrigerant (R22)

3. Tools commonly used for R32 and for conventional refrigerant (R22)

The table below shows the tools exclusive for R32 and their interchangeability

.

FILE NO. SVM-18048

- 13 -

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 to 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.

(Indoor unit)

(Outdoor unit)

Opened

Opened

Refrigerant cylinder

(with siphon)

Check valve

Open/close
valve for charging

Electronic balance for refrigerant charging

Opened

Closed

Service port

3-4. Recharging of Refrigerant

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

1. Never charge refrigerant exceeding the specified amount.

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

3. 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. 3-4-1 Configuration of refrigerant charging

FILE NO. SVM-18048

- 14 -

Gauge manifold

[ Cylinder with siphon ] [ Cylinder without siphon ]

OUTDOOR unit

Gauge manifold

OUTDOOR unit

Refrigerant

cylinder

Electronic

balance

Refrigerant

cylinder

Electronic

balance

Siphon

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

2. 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 R32 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.

R32 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.

3-5. Brazing of Pipes

3-5-1. 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.

1. 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.

2. When performing brazing again at time of
servicing, use the same type of brazing filler.

3-5-2. Flux

1. Reason why flux is necessary

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

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

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

Fig. 3-4-2

FILE NO. SVM-18048

- 15 -

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 temperature 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 brazing 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 removing
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
brazing filler/flux

1. Do not enter flux into the refrigeration cycle.

2. When chlorine contained in the flux remains
within the pipe, the lubricating oil deteriorates.
Therefore, use a flux which does not contain
chlorine.

3. When adding water to the flux, use water
which does not contain chlorine (e.g. distilled
water or ion-exchange water).

4. Remove the flux after brazing.

3-5-3. 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

1) Attach a reducing valve and a flow-meter to
the Nitrogen gas cylinder.

2) Use a copper pipe to direct the piping mate­rial, and attach a flow-meter to the cylinder.

3) Apply a seal onto the clearance between the
piping material and inserted copper pipe for
Nitrogen in order to prevent backflow of the
Nitrogen gas.

4) When the Nitrogen gas is flowing, be sure to
keep the piping end open.

5) 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.

6) 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).

7) Remove the flux completely after brazing.

Fig. 3-5-1 Prevention of oxidation during brazing

Piping material

Copper - Copper

Copper - Iron

Iron - Iron

Used brazing filler

Phosphor copper

Silver

Silver

Used flux

Do not use

Paste flux

Vapor flux

FILE NO. SVM-18048

- 16 -

Indoor Unit

4-1.

B10

U2FVG series

B13U2FVG series

B18U2FVG series

FILE NO. SVM-18048

- 17 -

RAS-B10 U2FVG-E,-TR
RAS-B13 U2FVG-E,-TR
RAS-B18 U2FVG-E,-TR

5. WIRING DIAGRAM

ORG

YEL : YELLOW

BLU : BLUE
WHI : W HITE
ORG : ORANGE
GRN & YEL :
GREEN & YELLOW

BLK : BLACK
RED : RED

Color indication

POWER SUPPLY
(From outdoor unit)

1∅ 220-240~ ,50Hz
1∅ 220-230~ ,60Hz

4
5

1
2
3

6
7
8
9

10

11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

9

10

11
12
13
14
15
16
17
18

20

4
5

2

1

3

4
5

2

1

3

4
5

2

1

3

4
5

2

1

3

4
5

2

1

3

4
5

2

1

3

4
5

2

1

3

4
5

2

1

3

13
13

8

12 11 10 9 8
12 11

10 9

5

67

567

44123

12

3

4455667

7

112 3 10 9 8

445

5

67

11223

3

CN212

1 432

HA

(WHI)

1

12

121

2

121

2

121

2

1
22

5

5

6634 1

34 1

3

2 1

Wireless Unit

Assembly

WP-021

CN381

(WHI)

CN301

(WHI)

CN201

(WHI)

CN261

(WHI)

CN401

(RED)

CN51
(WHI)

CN604

(WHI)

CN601

(WHI)

CN603

(YEL)

CN602
(BLU)

CN21

Main P.C Board

MCC-5068A

Power Supply Circuit

DC5V
DC12V

+

Fuse F01

T3.15A
250VAC

CN501 CN03 CN01

456112

~

-

+

~

CN801

R01

Varistor

Line
Filter

Thermo Sensor
(TA)

Heat Exch anger Sens or

(TCJ)

Heat Exch anger Sens or

(TC)

Indoor Terminal Block

RED

WHI

BLK

Heat
Exchanger

Fan Motor Base

GRN&YEL

GRN&YEL

SHEET
METAL

BLK

WHI
YEL
YEL
YEL
YEL

WHI

YEL
YEL
YEL

YEL

RED

BLU

BLU

BLU

BLU

BLU

ORG

ORG

BLU

BLU

WHI

45 233

DC MOTOR

Fan Motor

BLU

YEL

WHI

BLK

RED

Stepper motor

(Vertical air flow louver)

Stepper motor

(Damper)

RED

BLK

BLK

BLK

BLK

BLK

BLK

DC29V

3

FILE NO. SVM-18048

- 18 -

6. SPECIFICATIONS OF ELECTRICAL PARTS

6-1. Indoor Unit

No.

Fan motor (for indoor)

2 Room temp. sensor (TA-sensor)

10kΩ at 25°C

3

Heat exchanger temp. sensor (TC-sensor)

10kΩ

at 25°C

5 Louver motor

Output (Rated), 16 poles, DC12V

( - )

( -)

MP24Z3N

ICF-340-41-1 DC340, 41W

Parts n ame

1

Specif icat io nsType

6

Dumper motor

Output (Rated), 16 poles, DC12V

MP24Z3N

4

10kΩ

at 25°C

( -)

Heat exchanger temp. sensor (TCJ-sensor)

FILE NO. SVM-18048

- 19 -

7. REFRIGERANT CYCLE DIAGRAM

Outer dia. : 9.52mm
Thickness : 0.8mm

T1

Temp. measurement

TC

TA

INDOOR UNIT

Indoor heat

exchanger

Cross flow fan

Deoxidized copper pipe
Outer dia. : 6.35mm
Thickness : 0.8mm

Sectional shape
of heat insulator

Allowable height

difference : 10m

Allowable pipe length

Max. : *1
Min. : *1
Chargeless : *1

Charge : *1

*1 : Refer to the service manual of multi outdoor unit to be combined.

For RAS-B18U2FVG Series

Outer dia. : 12.7mm
Thickness : 0.8mm

P Pressure measurement
Gauge attaching port
Vacuum pump connecting port

Deoxidized copper pipe :

For RAS-B10U2FVG Series
RAS-B13U2FVG Series

7-1. Refrigerant Cycle Diagram

FILE NO. SVM-18048

- 20 -

7-2. Operation Data

<Cooling>

Heat exchanger pipe

temp.

Indoor fan

mode

Outdoor fan

mode

Indoor Outdoor T1 (°C) T2 (°C)

B10U2FVG-E,-TR

* * * * * *

B13U2FVG-E,-TR

* * * * * *

B18U2FVG-E,-TR

* * * * * *

<Heating>

Heat exchanger pipe

temp.

Indoor fan

mode

Outdoor fan

mode

Indoor Outdoor T1 (°C) T2 (°C)

* * * * * *
* * * * * *
* * * * * *

NOTES :

* Refer to service manual of outdoor unit which combined.

27/19 35/-

Compressor

revolution

(rps)

Tempeature

condition(°C)

Model name

RAS-

Standard

pressure

P (MPa)

Tempeature

condition(°C)

Model name

RAS-

Standard

pressure

P (MPa)

Compressor

revolution

(rps)

20/- 7/6

B10U2FVG-E,-TR
B13U2FVG-E,-TR
B18U2FVG-E,-TR

FILE NO. SVM-18048

- 21 -

8. CONTROL BLOCK DIAGRAM

8-1. Indoor Unit

M.C.U.

Indoor Unit Control Unit

Serial Signal Communication

(Operation Command and Information)

Serial Signal Transmitter/Receiver

Converter

(D.C circuit)

Noise Filter

Indoor

Fan Motor

Louver

Motor

Louver Motor
Drive Control

Indoor Fan

Motor Control

Initializing Circuit

Clock Frequency

Oscillator Circuit

Power Supply

Circuit

Infrared Rays, 36.7kHz

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

REMOTE CONTROL

FLOOR (ON/OFF)

ECO

Heat Exchanger Sensor (TC)

Room Temperature Sensor (TA)

Infrared Rays Signal Receiver

and Indication

Functions

• Cold draft preventing Function

• 3-minute Delay at Restart for Compressor

• Fan Motor Starting Control

•

Processing
(Temperature Processing)

•

Timer / Weekly Timer

• Serial Signal Communication

• Clean Function

Heat Exchanger Sensor (TCJ)

Power Supply
From Outdoor Unit

Damper

Drive Control

Damper

Motor

•

Power Selection

Hi-POWER

COMPORT SLEEP

Remote Control

Operation (START/STOP)

Operation Mode Selection

AUTO, COOL, DRY, HEAT

Thermo. Setting

FILE NO. SVM-18048

- 22 -

.
.
.

9. OPERATION DESCRIPTION

9-1. Outline of Air Conditioner Control

This air conditioner is a capacity-variable type air
conditioner, which uses DC motor for the indoor fan
motor and the outdoor fan motor. And the capacity­proportional control compressor which can change the
motor speed 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 controller
or indoor unit display buttons 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 valve. (P.M.V)
Besides, detecting revolution position of the compres­sor motor, the outdoor unit controller controls speed of
the compressor motor by controlling output voltage of
the inverter 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 reversely
the operating status information of the outdoor unit to
control the indoor unit controller.

2. Role of outdoor unit controller

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

• Compressor operation control

• Operation control of outdoor fan motor

• P.M.V. control

• 4-way valve control

Operations followed to judgment
of serial signal from indoor side.

• Detection of inverter input current and current
release operation

• Over-current detection and prevention operation
to IGBT 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 controller to indoor unit
controller

• Detection of outdoor temperature and operation
revolution control

• Defrost control in heating operation (Temp.
measurement by outdoor heat exchanger and
control for 4-way valve and outdoor fan)

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 controller

• 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.)

• Temperature of indoor heat exchanger

• For these signals ([Operation mode] and [Com-

pressor revolution] indoor heat exchanger tem­perature), the outdoor unit controller monitors the
input current to the inverter, and performs the
followed operation within the range that current
does not exceed the allowable value.

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.

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

1. Role of indoor unit controller

The indoor unit controller judges the operation
commands from the remote control or indoor unit
display buttons, and assumesthe following functions.

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

• Judgment of the indoor heat exchanger tempera­ture by using heat exchanger sensor (TC sensor)
(Prevent-freezing control, etc.)

• Louver motor control

• Indoor fan motor operation control

• LED (Light Emitting Diode) 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

NOTE :

FILE NO. SVM-18048

- 23 -

FILE NO. SVM-18048

- 24 -

9-2. Operation Description

1. Basic operation ........................................................................................................... 25

1.

Operation control ................................................................................................... 25

2.

Cooling/Heating operation ..................................................................................... 26

3.AUTO operation ......................................................................................................26

4.

DRY operation ........................................................................................................ 27

2.

Indoor fan motor control ............................................................................................. 28

3.

4.

Capacity control .......................................................................................................... 31

5.

Current release control ............................................................................................... 31

6.

Release protective co

ntrol by temperature of indoor heat exchanger........................ 31

7.

Defrost

control (Only in heating operation) ................................................................ 31

8.

Air outlet selection ...................................................................................................... 33

9.

Lower air outlet louver control ..................................................................................... 34

10.

Upper air outlet louver control .................................................................................... 35

11.

EC

O operation ........................................................................................................... 36

13.

Discharge temperature control ................................................................................... 37

14.

Pulse Modulating valve (P.M.V.) control ...................................................................... 38

15.

Self-Cleaning function ................................................................................................. 39

16.

Selt-Cleaning function release .................................................................................... 40

17.

Remote-A or B selection ............................................................................................ 41

9-

3. Auto Restart Function .............................................................................................47

9-

3-1. How to Set the A u

to Restart Function .............................. ........................................47

9-

3-2. How to Cancel t

he Au to Restar t Function ................................................................. 48

9-3-3. Power Failure During Timer Operation .................................................................... 48

23.

FIL

TER Indicator ...............................................................................................43

9-

4. Remote Control .........................................................................................................49

9-4-1. Remote control and its functions ................................................................................. 49

9-4-2. Operation of remote control ...................................................................................... 49

18.

QUIET mode ............................................................................................................. 42

19.

COMFORT SLEEP ................................................................................................... 42

20.

Short

Timer ................................................................................................................ 42

21.

One-Touch

Comfort .................................................................................................. 43

22.

Hi-PO

WER Mode ...................................................................................................... 43

9-4-3. Name and Functions of Indications on Remote Contr oller ........................................ 55

Outdoor Quiet control .

................................................................................................ 45

24.

Set temp. correction .

................................................................................................. 44

9-5. Indoor Unit Display & Unit Operation Panel ......................................................... 56

12.

Test operation ............................................................................................................ 37

Item

1. Basic
operation

Operation flow and applicable data, etc.

1. Operation control

Description

Receiving the user’s operation condition setup, the operation statuses of indoor/outdoor units are
controlled.

1) The operation conditions are selected by the remote controller or indoor unit display buttons as

shown in the bolow.

2) A signal is sent by ON button of the remote controller.

3) The signal is received by a sensor of the indoor unit and processed by the indoor controllers as
shown in the below.

4) The indoor controller controls the indoor fan motor and louver motor.

5) The indoor controller sends the operation command to the outdoor controller, and sends/receives
the control status with a serial signal.

6) The outdoor controller controls the operation as shown in the left, and also controls the compres­sor, outdoor fan motor, 4-way valve and pulse Modulating valve.

Indoor unit

Indoor unit control

• Command signal generating function of
indoor unit operation

• Calculation function (temperature calculation)

• Activation compensation function of indoor fan

• Cold draft preventive function

• Timer function

• Indoor heat exchanger release control

• Indoor fan motor

• Louver motor

Outdoor unit

Outdoor unit control

• Frequency control of inverter output

• Waveform composite function

• Calculation function
(Temperature calculation)

• AD conversion function

• Quick heating function

• Delay function of compressor reactivation

• Current release function

• GTr over-current preventive function

• Defrost operation function

• Compressor

• Outdoor fan motor

• 4-way valve

• Pulse Modulating valve
(P.M.V.)

Signal receiving

Indoor unit control

Operation command

Serial signal send/receive

Serial signal send/receive

Outdoor unit control

Inverter

~

Remote controller

Control contents of remote controller

• ON/OFF

• Operation select (COOL/HEAT/AUTO/DRY)

• Temperature setup

• Air direction

• Swing

• Air volume select

• ECO

• ON timer setup

• OFF timer setup

• Hi-POWER

Selection of

operation conditions

ON/OFF

(AUTO/LOW/LOW+/MED/MED+/HIGH)

• COMFORT SLEEP

• QUIET

• PRESET

• ONE-TOUCH

• FLOOR

Selecton
of
operation
conditions

Control contents of

unit display buttons

• ON/OFF

• Operation select

(AUTO/COOL/HEAT)

• Temperature setup

• Air outlet select

(AUTO/Upper/Lower

Indoor unit display buttons

FILE NO. SVM-18048

- 25 -

Operation ON

Setup of remote controller

Indoor fan motor control / Louver control / Operation Hz

Control (Requierment)

Indoor unit control

Sending of operation command signal

Outdoor unit control

[ ]

Compressor revolution control / Outdoor fan motor control /

4-way valve control In cooling operation: ON
In heating operation: OFF
Pulse Modulating valve control

Item

1. Basic
operation

Operation flow and applicable data, etc.

2. Cooling/Heating operation

Description

The operations are performed in the following parts by controls according to cooling/heating conditions.

1) Receiving the operation ON signal of the remote controller, the cooling or heating operation signal
starts being transferred form the indoor controller to the outdoor unit.

2) At the indoor unit side, the indoor fan is operated according to the contents of “2. Indoor fan
motor control” and the louver according to the contents of “9. Louver control”, respectively.

3) The outdoor unit controls the outdoor fan motor, compressor, pulse Modulating valve and

4-way valve according to the operation signal sent from the indoor unit.

3. AUTO operation

Selection of operation mode
As shown in the following figure, the operation starts by
selecting automatically the status of room temperature
(TA) when starting AUTO operation.

*1. When reselecting the operation mode, the fan

speed is controlled by the previous operation mode.

1) Detects the room temperature (TA) when
the operation started.

2) Selects an operation mode from TA in
the left figure.

3) Fan operation continues until an
operation mode is selected.

4) When AUTO operation has started
within 2 hours after heating operation
stopped and if the room temperature is
20°C or more, the fan operation is
performed with ”Super Ultra LOW” mode
for 3 minutes.
Then, select an operation mode.

5) If the status of compressor-OFF
continues for 15 minutes the room
temperature after selecting an operation
mode (COOL/HEAT), reselect an
operation mode.

Ts + 1

Ts – 1

Ta

Cooling operation

Monitoring (Fan)

Heating operation

Operation Hz control (Include limit control)

FILE NO. SVM-18048

- 26 -

1. Basic
operation

Operation flow and applicable data, etc.

Description

Item

4. DRY operation

DRY operation is performed according to the
difference between room temperature and the setup
temperature as shown below.

In DRY operation, fan speed is controlled in order to
prevent lowering of the room temperature.

1) Detects the room temperature (TA) when
the DRY operation started.

2) Starts operation under conditions in the
left figure according to the temperature
difference between the room tempera­ture and the setup temperature (Tsc).
Setup temperature (Tsc)
= Set temperature on remote controller

(Ts) + (-1.0 to 0.0)

3) When the room temperature is lower
2°C or less than the setup temperature,
turn off the compressor.

4) The time correction is performed every
8 minutes.

Fan Time

TA speed correction

(°C)

12 35 37 49 W8
11 32 34 42 W6
10 30 31 36

9272830
8252624
7222318
6202011
5W5
4W4
3
2
1

−1 zone

OFF OFF OFF (min 1)

+1 zone

±0

0

Compressor speed (rps)

B10U2FVG

Series

B13U2FVG

Series

B18U2FVG

Series

Zone

+4.5
+4.0
+3.5

+3.0
+2.5

+2.0
+1.5
+1.0
+0.5

0.0

−1.0

−1.5

−2.0

−0.5

FILE NO. SVM-18048

- 27 -

Item

2. Indoor fan
motor control

Operation flow and applicable data, etc.

<In cooling operation>

(This operation controls the fan speed at indoor unit side.)
The indoor fan (cross flow fan) is operated by the phase-

control induction motor. The fan rotates in 5 stages in
MANUAL mode, and in 5 stages in AUTO mode, respec­tively. (Table 1)

Description

* Symbols

UH : Ultra High
H : High
M+ : Medium+
M : Medium
L+ : Low+
L: Low
L- : Low–
UL : Ultra Low
SUL : Super Ultra Low

* The fan speed broadly varies due

to position of the louver, etc.
The described value indicates one
under condition of inclining
downward blowing.

1) When setting the fan speed to L,
L+, M, M+ or H on the remote
controller, the operation is
performed with the constant
speed shown in Fig. 1.

2) When setting the fan speed to
AUTO on the remote controller,
revolution of the fan motor is
controlled to the fan speed level
shown in Fig. 2 and Table 1
according to the setup tempera­ture, room temperature, and heat
exchanger temperature.

(Fig. 1)

(Fig. 2)

L

L+

M

M+

H

W7

(L + M) / 2

WA

(M + H) / 2

WD

Indication

Fan speed

Fan speed setup

COOL ON

AUTO

+2.5

TA-Tsc

[°C]

+2.0

+1.5

+1.0

+0.5

Tsc

a

b

c

d

e

M+(WC)

*3

*4

*5

L(W7)

MANUAL

*3 : Fan speed = (M + −L) x 3/4 + L

*4 : Fan speed = (M + −L) x 2/4 + L

*5 : Fan speed = (M + −L) x 1/4 + L

(Linear appro ximation
from M+ and L)

Hi Power

Fan speed

H+(WD)

*6

*7

*8

L+(W8)

*6 : Fan speed = (H −L+) x 3/4 + L+

*7 : Fan speed = (H −L+) x 2/4 + L+

*8 : Fan speed = (H −L+) x 1/4 + L+

(Linear appro ximation
from H and L+)

Hi-POWER

W8

(L + M) / 2

WC

(M + H) / 2

WE

Fan speed

level

Fan speed Air flow rate Fan speed Air flow rate Fan speed Air flow rate

(rpm) (m3/h) (rpm) (m3/h) (rpm) (m3/h)
WF 530 498 560 528 650 624
WE UH 530 498 560 528 650 624

WD H 500 468 540 510 630 600

WC M+

450 414 490 459

560 528

WB

450 414 490 459

560 528

WA M

400 366 440 408

500 468

W9

360 324 390 354

450 414

W8 L+

350 315 390 354

450 414
W7 L 300 258 340 300 400 366
W6

L−

260 216 270 228 360 324
W5 UL 260 216 270 228 340 300
W4 240 198 250 210 320 282
W3 SUL 240 198 240 198 300 258
W2 240 198 240 198 300 258
W1 240 198 240 198 300 258

RAS-B13U2FVG

Series

RAS-B18U2FVG

Series

Cool

RAS-B10U2FVG

Series

(table 1) Indoor fan air flow rate <Cooling>

FILE NO. SVM-18048

- 28 -

Item

2. Indoor fan
motor control

Operation flow and applicable data, etc.

<In heating operation>

Description

1) When setting the fan speed to L,
L+, M, M+ or H on the remote
controller, the operation is per­formed with the constant speed
shown in Fig. 3 and Table 1.

2) When setting the fan speed to
AUTO on the remote controller,
revolution of the fan motor is
controlled to the fan speed level
shown in Fig. 5 according to the set
temperature and room temperature.

3) Min air flow rate is controlled by
temperature of the indoor heat
exchanger (TC) as shown in Fig. 4.

4) Cold draft prevention, the fan
speed is controlled by temperature
of the indoor heat exchanger (TC)
as shown in Fig. 6.

(Fig. 3)

(Fig. 4)

Cold draft preventive control

(Fig. 6)

* No limitation while fan speed MANUAL mode is in stability.
* A: When Tsc ≥ 24, A is 24, and when Tsc < 24, A is Tsc

Tsc: Set value

H (WE)

Line-approximate

M+and SUL with TC.

SUL (W2)

Stop

46 46TC34
45 45 33

33 33 21
32 32 20

*A+4 *A+4 *A+4

*A-4 *A-4 *A-4

Fan speed MANUAL in starting
Fan speed AUTO in stability
Fan speed AUTO in star ting

Fan speed setup

HEAT ON

AUTO

YES

NO

MANUAL

TC ≥ 42 C

Min air flow rate control

Tc

52
51

42
41

Limited to Min WD tap

* Fan speed =

(TC –

– W8) + W8

No limit

*

Fan speed

Basic fan control

TSC

b

- 0.5

c

- 1.0

d

- 1.5

e

- 2.0

f

- 2.5

g

- 5.0

L+ (W9)

*1

*2

*3

M+(WD)

*1: Fan speed = (M + −L+) x 1/5 + L+
*2: Fan speed = (M + −L+) x 2/5 + L+
*3: Fan speed = (M + −L+) x 3/5 + L+
*4: Fan speed = (M + −L+) x 4/5 + L+
(Calculated with linear approximation from M+ and L+)

TA-Tsc [°C]

Hi Power

*4

H(WE)

M(W8)

*5

*6

*7

*8

- 5.5

*5: Fan speed = (H −M) x 1/5 + M
*6: Fan speed = (H −M) x 2/5 + M
*7: Fan speed = (H −M) x 3/5 + M
*8: Fan speed = (H −M) x 4/5 + M
(Calculated with linear approximation from H and M)

L

L+

M

M+

H

W8

(L + M) / 2

WB

(M + H) / 2

WE

Indication

Fan speed Hi-POWER

W9

(L + M) / 2

WD

(M + H) / 2

WF

(Fig. 5)

FILE NO. SVM-18048

- 29 -

(Table 2) Indoor fan air flow rate <Heating>

Fan speed

level

Fan speed Air flow rate Fan speed Air flow rate Fan speed Air flow rate

(rpm) (m3/h) (rpm) (m3/h) (rpm) (m3/h)
WF UH 560 528 600 570 690 666
WE H 540 510 580 552 670 642
WD M+

480 443

520 486

590

570

WC 440 408

470 435

570 540

WB M

430

399 460 426 520 486

WA 380 342

410 376

460 426

W9 L+

370 334 400 366

460 426

W8 L

320 282

340 300 400 366
W7 L- 260 216 270 228 360 324
W6 260 216 270 228 340 300
W5 UL 260 216 270 228 340 300
W4 260 216 270 228 340 300
W3 260 216 270 228 340 300
W2 SUL 240 198 250 210 320 282
W1 240 198 240 198 240 198

HEAT

Item

Operation flow and applicable data, etc. Description

[In starting and in stability]

FAN AUTO

FAN Manual

In starting

• Until 12 minutes passed after operation start

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

• Room temp. < Set temp. –4°C

In stability

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

• When 25 minutes or more passed after operation start

• Room temp. = Set temp. –3.5°C

RAS-B13U2FVG

Series

RAS-B18U2FVG

Series

RAS-B10U2FVG

Series

FILE NO. SVM-18048

- 30 -