Toshiba RAS-18N3KVR-E, RAS-18N3AV-E, RAS-22N3KVR-E, RAS-22N3AV-E SERVICE MANUAL

SERVICE MANUAL

FILE NO. SVM-12070

SPLIT TYPE

Indoor Unit Outdoor Unit

RAS-18N3KVR-E RAS-18N3AV-E

RAS-22N3KVR-E RAS-22N3AV-E

R410A

December, 2012

FILE NO. SVM-12070

CONTENTS

1. SAFETY PRECAUTIONS .......................................................................... 2

2. SPECIFICATIONS ..................................................................................... 5

3. REFRIGERANT R410A ............................................................................. 7

4. CONSTRUCTION VIEWS ........................................................................ 15

5. WIRING DIAGRAM .................................................................................. 17

6. SPECIFICATIONS OF ELECTRICAL PARTS ......................................... 18

7. REFRIGERANT CYCLE DIAGRAM ........................................................ 19

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

9. OPERATION DESCRIPTION................................................................... 24

10. INSTALLATION PROCEDURE ................................................................ 48

11. HOW TO DIAGNOSE THE TROUBLE...................................................... 64

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

13. EXPLODED VIEWS AND PARTS LIST ................................................... 104

– 1 –

FILE NO. SVM-12070

1. SAFETY PRECAUTIONS

The manufacturer shall not assume any liability for the damage caused by not observing the description of this manual.
Be sure to read this installation manual carefully before installing.
Recommend to the owner to perform maintenance periodically when using over long periods of time.
Be sure to follow the precautions provided here to avoid safety risks. The symbols and their meanings are shown below.

DANGER : It indicates that incorrect use of this unit can result in a high possibility of severe injury (*1) or death.
WARNING : It indicates that incorrect use of this unit may cause severe injury of death.
CAUTION : It indicates that incorrect use of this unit may cause personal injury (*2) or property damage (*3).

*1 : A severe injury refers to blindness, injury, burns (hot or cold), electrical shock, bone fracture, or
poisoning that leaves aftereffects and requires hospitalization or extended out-patient treatment.
*2 : Personal injury means a slight accident, burn, or electrical shock which does not require admission
or repeated hospital treatment.
*3 : Preperty damage means greater damage which affects assets or resources.

For general public use

Power supply cord of parts of appliance for outdoor use shall be at least polychloroprene sheathed flexible cord
(design H07RN-F) or cord designation 60245 IEC66 (1.5 mm2 or more). (Shall be installed in accordance with national
wiring regulations.)

CAUTION
New refrigerant air conditioner installation

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

R410A refrigerant is apt to be affected by impurities such as water, oxidizing membranes, and oils because the
pressure of R410A refrigerant is approx. 1.6 times of refrigerant R22. As well as the adoption of this new refrigerant,
refrigerating machine oil has also been changed. Therefore, during installation work, be sure that water, dust,
former refrigerant, or refrigerating machine oil does not enter the refrigeration cycle of a new-refrigerant air
conditioner. To avoid mixing refrigerant and refrigerating machine oil, the sizes of charging port connecting port
connecting sections on the main unit are different from those for the conventional refrigerant, and different size tools
are also required. For connecting pipes, use new and clean piping materials with highpressure withstand
capabilities, designed for R410A only, and ensure that water or dust does not enter. Moreover, do not use any
existing piping as its pressure withstand may be insufficient and may contain impurities.

DANGER

• FOR USE BY QUALIFIED PERSONS ONLY.

• MEANS FOR DISCONNECTION FROM THE SUPPLY HAVING A CONTACT SEPERATION OF AT LEAST 3 mm

IN ALL POLES MUST BE INCORPORATED IN THE FIXED WIRING.

• 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.

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

• CHECK THE EARTH WIRE THAT IT IS NOT BROKEN OR DISCONNECTED BEFORE INSTALLATION.

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

FAILURE TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR EXPLOSION.

• TO PREVENT OVERHEATING THE INDOOR UNIT AND CAUSING A FIRE HAZARD, PLACE THE UNIT WELL
AWAY (MORE THAN 2 M) FROM HEAT SOURCES SUCH AS RADIATORS, HEATERS, FURNACE, STOVES, ETC.

• WHEN MOVING THE AIR CONDITIONER FOR INSTALLING IT IN ANOTHER PLACE AGAIN, BE VERY
CAREFUL NOT TO GET THE SPECIFIED REFRIGERANT (R410A) WITH ANY OTHER GASEOUS BODY INTO
THE REFRIGERATION CYCLE. IF AIR OR ANY OTHER GAS IS MIXED IN THE REFRIGERANT, THE GAS
PRESSURE IN THE REFRIGERATION CYCLE BECOMES ABNORMALLY HIGH AND IT RESULTINGLY CAUSES
BURST OF THE PIPE AND INJURIES ON PERSONS.

• IN THE EVENT THAT THE REFRIGERANT GAS LEAKS OUT OF THE PIPE DURING THE INSTALLATION WORK,
IMMEDIATELY LET FRESH AIR INTO THE ROOM. IF THE REFRIGERANT GAS IS HEATED BY FIRE OR
SOMETHING ELSE, IT CAUSES GENERATION OF POISONOUS GAS.

• WHEN INSTALLING OR RE-INSTALLING THE AIR CONDITIONER, DO NOT INJECT AIR OR OTHER SUBSTANCES
BESIDES THE DESIGNATED REFRIGERANT "R410A" INTO THE REFRIGERATION CYCLE. IF AIR OR OTHER
SUBSTANCES ARE MIXED, AN ABNORMAL PRESSURE CAN OCCUR IN THE REFRIGERATING CYCLEL, AND
THIS CAN CAUSE AN INJURY DUE TO A PIPE RUPTURE.

– 2 –

FILE NO. SVM-12070

WARNING

• Installation work must be requested from the supplying retail dealership or professional vendors. Self-installation may
cause water leakage, electrical shock, or fire as a result of improper installation.

• Specified tools and pipe parts for model R410A are required, and installation work must be done in accordance with
the manual. HFC type refrigerant R410A has 1.6 times more pressure than that of conventional refrigerant (R22).
Use the specified pipe parts, and ensure correct installation, otherwise damage and/or injury may be caused. At the
same time, water leakage, electrical shock, and fire may occur.

• Be sure to install the unit in a place which can sufficiently bear its weight. If the load bearing of the unit is not enough,
or installation of the unit is improper, the unit may fall and result in injury.

• Electrical work must be performed by a qualified elecrical engineer in accordance with the code governing such
installation work, inernal wiring regulations, and the manual. A dedicated circuit and the rated voltage must be used.
Insufficient power supply or improper installation may cause electrical shock or fire.

• Use a cabtyre cable to connect wires in the indoor/outdoor units. Midway connection, stranded wire, and single-wire
connections are not allowed. Improper connection or fixing may cause a fire.

• Wiring between the indoor unit and outdoor units must be well shaped so that the cover can be firmly placed.
Improper cover installation may cause increased heat, fire, or electrical shock at the terminal area.

• Be sure to use only approved accessories or the specified parts. Failure to do so may cause the unit to fall, water
leakage, fire or electrical shock.

• After the installation work, ensure that there is no leakage of refrigerant gas. If the refrigerant gas leaks out of the
pipe into the room and is heated by fire or something else from a fan heater, stove or gas range, it causes generation
of poisonous gas.

• Make sure the equipment is properly earthed. Do not connect the earth wire to a gas pipe, water pipe, lightning
conductor, or telephone earth wire. Improper earth work may be the cause of electrical shock.

• Do not install the unit where flammable gas may leak. It there is any gas leakage or accumulation around the unit,
it can cause a fire.

• Do not select a location for installation where there may be excessive water or humidity, such as a bathroom.
Deterioration of insulation may cause elestrical shock or fire.

• Installation work must be performed following the instructions in this installation manual. Improper installation may
cause water leakage, electrical shock or fire. Check the following items before operating the unit.

- Be sure that the pipe connection is well placed and there are no leaks.

- Check that the service valve is open. If the service valve is closed, it may cause overpressure and result in
compressor damage. At the same time, if there is a leak in the connection part, it may cause air suction and
overpressure, resulting burst or injury.

• In pump down operations, ensure to perform the following procedures.

- Do not inject air into the refrigeration cycle.

- Be sure to close both service valves and stop the compressor before removing the refrigerant pipe. It removing
the refrigerant pipe while the compressor is operating with the service valves opened, it may cause to air absorbed
and abnormal high pressure inside the refrigeration cycle and resulting burst or injury.

• Do not modify the power cable, connect the cable midway, or use a multiple outlet extension cable. Doing so may
cause contact failure, insulation failure, or excess current, resulting in fire or electrical shock.

• Do not use any refrigerant different from the one specified for complement or replacement. Otherwise, abnormally
high pressure may be generated in the refrigeration cycle, which may result in a failure or explosion of the product
or an injury to your body.

• Be sure to comply with local regulations/codes when running the wire from the outdoor unit to the indoor unit,
(Size of wire and wiring method etc.).

• Places where iron or other metal dust is present. If iron or other metal dust adheres to or collects on the interior of
the air conditioner, it may spontaneously combust and start a fire.

• If you detect any damage, do not install the unit. Contact your supplying dealer immediately.

• Never modify this unit by removing any of the safety guards.

• 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.

– 3 –

FILE NO. SVM-12070

CAUTION

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

• Exposure of unit to water or other moisture before installation could result in electric shock. Do not store it in a wet
basement or expose to rain or water.

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

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

level of the unit or where noise and discharged air might disturb neighbors.

• This appliance must be connected to the main power supply by means of a circuit breaker depending on the place
where the unit is installed. Failure to do so may cause electrical shock.

• Follow the instructions in this installation manual to arrange the drain pipe for proper drainage from the unit.
Ensure that drained water is discharged. Improper drainage can result in water leakage, causing water damage
to furniture.

• Tighten the flare nut with a torque wrench using the prescribed method. Do not apply excess torque. Otherwise, the
nut may crack after a long period of usage and it may cause the leakage of refrigerant.

• Wear gloves (heavy gloves such as cotton gloves) for installation work. Failure to do so may cause personal injury
when handling parts with sharp edges.

• Do not touch the air intake section or the aluminum fins of the outdoor unit. It may cause injury.

• Do not install the outdoor unit in a place which can be a nest for small animals. Small animals could enter and contact

internal electrical parts, causing a failure or fire.

• Request the user to keep the place around the unit tidy and clean.

• Make sure to conduct a trial operation after the installation work, and explain how to use and maintain the unit to the

customer in accordance with the manual. Ask the customer to keep the operation manual along with the
installation manual.

– 4 –

2-1. Specifications

FILE NO. SVM-12070

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 Cooling Heating Cooling Heating
characteristic Running current (220 - 240V) (A) 0.30 - 0.28 0.30 - 0.28 0.38 - 0.35 0.38 - 0.35

Power consumption (W) 40 40 50 50
Power factor (%) 60 60 60 60

Outdoor Operation mode Cooling Heating Cooling Heating

Running current (220 - 240V) (A) 6.35 - 5.82 6.98 - 6.40 8.93 - 8.19 9.18 - 8.42
Power consumption (W) 1380 1520 1945 2000
Power factor (%) 99 99 99 99

Starting current (A)
COP 3.52 3.72 3.01 3.41
Sound Pressure Indoor H/M+/M/L+/L (dB-A)
level Outdoor H (dB-A) 49 50 53 52
Sound power Indoor H/M+/M/L+/L (dB-A)
level Outdoor H (dB-A) 64 65 68 67
Indoor unit Unit model

Dimention Height (mm)

Width (mm)

Depth (mm)

Net weigh (kg)
Fan motor output (W)
Air flow rate (Cooling/Heating)

Outdoor unit Unit model

Dimension Height (mm)

Width (mm)

Depth (mm)

Net weigh (kg)
Compressor Motor output (W)

Type

Model

Fan motor output (W)

Air flow rate
Piping Type
connection Indoor unit Liquid side (mm)

Gas side (mm)

Outdoor unit Liquid side (mm)

Gas side (mm)
Maximum length (m)
Maximun chargeless length (m)
Maximum height difference (m)

Refrigerant Name of refrigerant

Weight (kg)

Wiring connection Power supply

Interconnection

Usable temperature range Indoor

Outdoor

Accessary Indoor unit Installation plate

Wireless remote controller

Batteries

Batteries cover

Remote controller holder

Toshiba New IAQ filter (Long)

Mounting screw

Pan head wood screw

Plasma air purifier

Installation instruction

Owner's manual
Outdoor unit Drain nipple

Water-proof rubber cap

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

(m3 / min)

(m3 / min)

(oC)
(oC)

RAS -18N3KVR -E

RAS -18N3AV -E

5.0

1.1 - 6.0

5.8

0.8 -6.3
1Ph/50Hz/220-240V, 1Ph/60Hz/220-230V

- -

44/41/38/35/32 47/44/42/38/35

59/56/53/50/47 62/59/56/53/50

RAS-18N3KVR -E RAS-22N3KVR-E

15.9 16.5

RAS -18N3AV -E

Twin rotary type with DC-inverter variable speed control

DA131S1B-31FZ

36.3 31.9
Flare connection

21~32 ~28

-10~46 -15~24

2 (∅3.1 x 16L), 1 (∅ 3.1 x 25L)

59/56/53/50/47 62/59/57/53/50

320

1050

243

13
30

550
780
290

39

1100

43

∅6.35

∅12.70

∅6.35

∅12.70

20
15
10

R410A

1.40
3 Wires: Includes earth (Outdoor)

4 Wires: Includes earth

1
1
2
1
1

1

6 (∅4 x 25L)

­1
1
1
2 2

RAS -22N3KVR -E

RAS -22N3AV -E

6.0

1.2 - 6.7

7.0

1.0 - 7.5

47/44/41/38/3544/41/38/35/32

320

1050

243

13
30

17.7 18.0

RAS -22N3AV -E

550
780
290

41

1100

DA150A1F-20F

43

38.6 37.2
Flare connection

∅6.35

∅12.70

∅6.35

∅12.70

20
15
10

R410A

1.40

21~32 ~28

-10~46 -15~24
1
1
2
1
1

1

6 (∅4 x 25L)

2 (∅3.1 x 16L), 1 (∅ 3.1 x 25L)

­1
1
1

– 5 –

2-2. Operation Characteristic Curve

<Cooling> <Heating>

FILE NO. SVM-12070

10.00

9.00

8.00

7.00

6.00

5.00

Current (A)

4.00

3.00

2.00

1.00

0.00
0 102030405060708090100110120

RAS-22N3KVR-E

RAS-18N3KVR-E

Compressor Speed (RPS)

10.00

9.00

8.00

7.00

6.00

5.00

Current (A)

4.00

3.00

2.00

1.00

0.00
0 102030405060708090100110120

RAS-22N3KVR-E

RAS-18N3KVR-E

Compressor Speed (RPS)

2-3. Capacity Variation Ratio According to Temperature

<Cooling> <Heating>

105

100

95

90

85

80

75

70

Capacity Ratio (%)

Condition

65

Indoor: DB27°C/WB19°C
Indoor Air-Flow Volume: High
Pipe Length: 7.5m

60

Capacity Ratio : 100% =

5.0kW (RAS-18N3KVR-E)

55

6.0kW (RAS-22N3KVR-E)

120

100

80

60

Capacity Ratio (%)

40

20

Condition
Indoor: DB20°C
Indoor Air-Flow Volume: High
Pipe Length: 7.5m

Capacity Ratio : 100% =

5.8kW (RAS-18N3KVR-E)

7.0kW (RAS-22N3KVR-E)

50

0

32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 –15 –10–50 510

Outdoor Temperature (°C)

Outdoor Temperature (°C)

– 6 –

3. REFRIGERANT R410A

FILE NO. SVM-12070

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 existing 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. 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

As R410A’s pressure is about 1.6 times higher than
that of R22, improper installation/servicing may
cause a serious trouble. By using tools and
materials exclusive for R410A, it is necessary to
carry out installation/servicing safely while taking
the following precautions into consideration.

1. Never use refrigerant other than R410A in an air
conditioner which is designed to operate with
R410A.

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

2. Confirm the used refrigerant name, and use
tools and materials exclusive for the refrigerant
R410A.

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

3. If a refrigeration gas leakage occurs during
installation/servicing, be sure to ventilate fully.

If the refrigerant gas comes into contact with fire,
a poisonous gas may occur.

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

5. After completion of installation work, check to
make sure that there is no refrigeration gas
leakage.

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

6. When an air conditioning system charged with a
large volume of refrigerant is installed in a small
room, it is necessary to exercise care so that,
even when refrigerant leaks, its concentration
does not exceed the marginal 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 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 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 3-2-1.

Never use copper pipes thinner than 0.8 mm
even when it is available on the market.

– 7 –

Table 3-2-1 Thicknesses of annealed copper pipes

Thickness (mm)

FILE NO. SVM-12070

Nominal diameter

1/4

3/8

1/2

5/8

Outer diameter (mm)

6.35

9.52

12.70

15.88

R410A 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

– 8 –

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 R410A 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.

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

FILE NO. SVM-12070

Fig. 3-2-1 Flare processing dimensions

Nominal

diameter

1/4 6.35 0.8

3/8 9.52 0.8

1/2 12.70 0.8

5/8 15.88 1.0

Nominal

diameter

1/4 6.35 0.8

3/8 9.52 0.8

Outer

diameter

(mm)

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

Outer

diameter

(mm)

Thickness

(mm)

Thickness

(mm)

Flare tool for R410A

clutch type

0 to 0.5

0 to 0.5

0 to 0.5

0 to 0.5

Flare tool for R22

clutch type

0 to 0.5

0 to 0.5

A (mm)

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

A (mm)

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

1/2 12.70 0.8

5/8 15.88 1.0

Table 3-2-5 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

– 9 –

0 to 0.5

0 to 0.5

Dimension (mm)

ABCD

9.1 9.2 6.5 13

13.2 13.5 9.7 20

16.0 16.6 12.9 23

19.0 19.7 16.0 25

0.5 to 1.0 1.5 to 2.0

0.5 to 1.0 1.5 to 2.0

Flare nut width

(mm)

17

22

26

29

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

FILE NO. SVM-12070

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

45˚ to 46˚

B A

Dimension (mm)

ABCD

9.0 9.2 6.5 13

13.0 13.5 9.7 20

16.0 16.2 12.9 20

19.0 19.7 16.0 23

23.3 24.0 19.2 34

D

C

43˚ to 45˚

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 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-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 R410A [Reference values]

Nominal
diameter

Outer

diameter

(mm)

Tightening torque

N•m (kgf•cm)

1/4 6.35 14 to 18 (140 to 180)

torque wrenches available on the market

Tightening torque of

N•m (kgf•cm)

16 (160), 18 (180)

3/8 9.52 33 to 42 (330 to 420)

1/2 12.70 50 to 62 (500 to 620)

5/8 15.88 63 to 77 (630 to 770)

– 10 –

42 (420)

55 (550)

65 (650)

FILE NO. SVM-12070

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 R410A 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 R410A (Those which cannot be used for conventional refrigerant (R22))

2. Tools exclusive for R410A, but can be also used for conventional refrigerant (R22)

3. Tools commonly used for R410A and for conventional refrigerant (R22)
The table below shows the tools exclusive for R410A and their interchangeability.

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

Tools whose specifications are changed for R410A and their interchangeability

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

air-water heat pump installation

R410A

Existence of Whether conventional
new equipment equipment can be
for R410A used

Ye s ∗ (Note 1)

Ye s ∗ (Note 1)

Ye s N o

Ye s N o

Ye s N o

Ye s N o

Ye s N o

Ye s N o

∗ (Note 2) No

Conventional air-water

heat pump installation

Whether new equipment
can be used with
conventional refrigerant

Ye s

∗ (Note 1)

No

No

Ye s

Ye s

No

Ye s

No

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

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

(Note 2) Charging cylinder for R410A is being currently 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

– 11 –

FILE NO. SVM-12070

3-4. Recharging of Refrigerant

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

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

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

Connect the charge hose to the vacuum pump
adapter.

Open fully both packed valves at liquid and gas
sides.

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.

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.

(For refrigerant charging, see the figure below.)

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.

(Indoor unit)

Opened

(Outdoor unit)

Refrigerant cylinder

(with siphon)

Check valve

Opened
Open/close
valve for charging

Electronic balance for refrigerant charging

Fig. 3-4-1 Configuration of refrigerant charging

Opened

Closed

Service port

– 12 –

FILE NO. SVM-12070

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 R410A is mixed type of refrigerant.
Accordingly, when charging refrigerant from the refrigerant cylinder to the equipment, charge it turning the
cylinder upside down if cylinder is not equipped with siphon.

[ Cylinder with siphon ] [ Cylinder without siphon ]

Gauge manifold

OUTDOOR unit

Refrigerant

cylinder

Gauge manifold

OUTDOOR unit

cylinder

Refrigerant

Electronic

balance

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

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.

Electronic

balance

Siphon

Fig. 3-4-2

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

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. 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.

– 13 –

Nitrogen gas

cylinder

Pipe

Flow meter

M

Stop valve

From Nitrogen cylinder

Nitrogen gas

Rubber plug

FILE NO. SVM-12070

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

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.

Piping material

Copper - Copper

1. Do not enter flux into the refrigeration cycle.

2. When chlorine contained in the flux remains

3. When adding water to the flux, use water

4. Remove the flux after brazing.

Copper - Iron

Iron - Iron

Used brazing filler

Phosphor copper

Silver

Silver

Used flux

Do not use

Paste flux

Vapor flux

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

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

Fig. 3-5-1

Prevention of oxidation during brazing

– 14 –

FILE NO. SVM-12070

4-1. Indoor Unit

Grille Inlet

Front Panel

73.5 7
50

Knock out system Knock out system

Heat exchanger

320

4. CONSTRUCTION VIEWS

Air Inlet

1050

Air filter

Air outlet

243

50

73.5
7

Drain hose (0.5m)

Connecting pipe (0.39m)

(Flare

50

72 78

132

525

Hanger Hanger

Connecting pipe (0.49m)

12.70)

85

Hanger

786

235

215 215

235

78 72

150 200 222 200 278

(Flare

23

50

Wireless remote controller

Remote controller holder

6.35)

For stud bold (
For stud bold (

57

63

6)
8~

172

18

149

17.5

10)

320

40

47

65

215.5

Hanger

262.5

Center line

262.5

Installation plate outline

– 15 –

Hanger

153.5

Outline of indoor unit

65

109

40

4-2. Outdoor Unit

28

FILE NO. SVM-12070

A

108 125

600

320

50

36

306

R5.5

R

Ø

15

6 hole

A detail Drawing (Back leg)

290

86

320

Ø

FAN-GUARD

436

Ø

550

275

25 Drain outlet

2

-

Ø

11 x 14

(For 8 -

Ø

Hole

10 anchor bolt)

Ø

80

306

320

Ø

6 hole

11x14 hole

Ø

36
50

R

15

B Detail Drawing (Front leg)

COVER-PV

Z

9060090

69

320
342

100 or more

320

100 or more

Z View

600

Air intlel

Air outlel

600 or more

Installation dimension

5

92

4

Service port

137

2 - R5-5 x 17L Ushape

(For ∅ 8 - ∅10 anchor bolt)

600 or more

2 - ∅11 x 14 Long holes (For ∅8- ∅10 anchor bolt)

Liquid side
(Flare 6.35)

Ø

Gas side

(Flare ∅ 12.7)

– 16 –

5-1. Indoor Unit / Outdoor Unit

FILE NO. SVM-12070

5. WIRING DIAGRAM

Compressor

CM

Reactor

RED

P04

1

WHI

P05

2

BLK

P06

3

P25

P24

P23

P22

P21

P20

P35 L03

P34

P19

P18
P11

2

P08

DB01

Q404

P32

P33 P30 BLK

PUR

YEL

YEL

BRW

YEL

ORN

1
2
3

121

Q200 ~ 205
IGBT

Power Relay

DB02

P31

Reactor

R221

R220

R219

C13

+ + +

C12 C14

CT

Relay
CN701 P07

112

2

11223

Coil for

4-way Valve

Indoor Terminal Block

3

Q300 ~ 305
MOS-FET

R321

R320

R319

P. C. Board

L01

Surge

Absorber

MCC-5009

F03 Fuse
250V ~, T3.15A

Varistor

Varistor

F01 Fuse
250V ~, T25A

ORN WHI

123

BLK

P03

WHI

P10
BLK

N

NL321

Power Supply
(From Main Line)

RED

CN300

CN700

CN603

CN602

CN601

CN600

P02

GRN&YEL

BLK

3

3

WHI

2

2

RED

1

1

6

6

5

5

4

4
3 3
2 2
1 1

Pulse Motor Valve

3

3
2

2

1

1

Temp. Sensor

212

1

Temp. Sensor

3

3
2

2

1

1

Discharge pipe

Temp. Sensor

212

1

Condenser pipe

Temp. Sensor

Heat
Exchanger

FM

Fan Motor

PMV

(TS)

Suction pipe

(TO)

Outdoor

(TD)

(TE)

Ion

Electrode

High-voltage

Power Supply

1

1 2

Air purifier

Electrode

2 3

3 4

4

SHEET METAL

BLK

CN01

3

(WHI)

CN02

3

Fuse F01

T3.15A 250VAC

2112

Varistor

Heat Exchanger Sensor

(TC)

Thermo Sensor

(TA)

CN11

(BLK)

CN62
(BLU)

11
22

CN61
(WHI)

BLU

1

BLU

2

2

BLU

3

3

BLU

4

4

BLU

5

5

BLU

6

6

BLU

7

7

BLU

8

8

BLU

9

9

BLU

10 10

WP-027

WHI

11111

CN10

(WHI)

Wireless Unit Assembly

21

CN21
(WHI)

1
1

CN51

Line
Filter

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

10

10

11

11

Main P.C Board

1 44332
1

2

BRW

BRW

BRW

RED

1

BLU

2 1

2 3

41

2 1

2

3 4

CN41

CN42
(WHI) (RED)

DC5V
DC12V
DC15V

MCC-5045

1 32 5

Micro SW

11

33

6 6

CN31

(WHI)

2 2

4 4

CN32

(WHI)

4 6

CN81
(WHI)

44
55

WHI

11

YEL
YEL

33

YEL
YEL

55

DC Motor

Fan Motor

1

1
2

2

3

3

4

4

5

5

Louver Motor

CN22

(WHI)

1
2
3
4

Color indication

YEL:YELLOW
BLK:BLACK
RED:RED
BLU:BLUE

Power Supply Circuit

WHI:WHITE
GRN&YEL:
GREEN & YELLOW

– 17 –

6-1. Indoor Unit

FILE NO. SVM-12070

6. SPECIFICATIONS OF ELECTRICAL PARTS

No.

1

Fan motor (for indoor)

2

Room temp. sensor (TA-sensor)

3

Heat exchanger temp. sensor (TC-sensor)

4

Louver motor

6-2. Outdoor Unit

No.

1

Reactor

2

Outdoor fan motor

3

Suction temp. sensor (TS sensor)

Parts name Model name

MF-340-30-3

( — )

( — )

MSBPC20F04

Parts name

Model name

CH-57-Z-T

ICF-140-43-4R

(Inverter attached)

Rating

DC340V, 30W

10kΩ at 25°C

10kΩ at 25°C

Output (Raed) 1W, 16 poles, DC12V

Rating

L = 10mH, 16A (50Hz)

DC140V, 43W

10kΩ (25°C)

4

Discharge temp. sensor (TD sensor)

5

Outside air temp. sensor (TO sensor)

6

Heat exchanger temp. sensor (TE sensor)

Terminal block (5P)

7

RAS-18N3AV-E

Compressor

8

RAS-22N3AV-E

9

Coil for PMV

10

Coil for 4-way valve

RAS-18N3AV-E

RAS-22N3AV-E

(Inverter attached)

(Inverter attached)

(Inverter attached)

JXO-5B

DA131S1B-31FZ

DA150A1F-20F

CAM-MD12TCTH-5

STF-01AJ646A1

STF-01AJ503K1

62kΩ (20°C), 3.3kΩ (100°C)

10kΩ (25°C)

10kΩ (25°C)

20A, AC250V

3-phases 4-poles 1100W

DC12V

AC220–240V (50/60Hz)

– 18 –

7. REFRIGERANT CYCLE DIAGRAM

7-1. Refrigerant Cycle Diagram

RAS-18N3KVR-E / RAS-18N3AV-E

FILE NO. SVM-12070

P

Pressure measurement
Gauge attaching port

Vacuum pump connecting port

Deoxidized copper pipe
Outer dia. : 12.7mm

Thickness : 0.8mm

4-way valve

(STF-0108-Z)

Accumulater tank

Deoxidized copper pipe
Outer dia. : 6.35mm

Thickness : 0.8mm

Muffler

Muffler

TD

Compressor
DA131S1B-31FZ

INDOOR UNIT

Indoor heat

exchanger

Cross flow fan

Sectional shape
of heat insulator

T1 Temp. measurement

TC

TA

difference: 10m

Allowable height

Strainer

Pulse Modulating valve
at liquid side
(CAM-

Max. : 20m
Min. : 2m
Chargeless : 15m
Charge : 20g/m

(16 to 20m)

Allowable pipe length

BD16TCTH-2)

TS

TO

Outdoor heat
exchanger

Propeller fan

Split capillary
2-dia. 1.2 × 80

TE

Distributor

OUTDOOR UNIT

Refrigerant amount: 1.40kg

NOTE:

Refrigerant flow (Cooling)
Refrigerant flow (Heating)

Gas leak check position

NOTE :

• The maximum pipe length of this air conditioner is 20m. When the pipe length exceeds 15m, the additional
charging of refrigerant, 20g per 1m for the part of pipe exceeded 15m is required. (Max. 100g)

– 19 –

RAS-22N3KVR-E / RAS-22N3AV-E

FILE NO. SVM-12070

P

Pressure measurement
Gauge attaching port

Vacuum pump connecting port

Deoxidized copper pipe
Outer dia. : 12.7mm

Thickness : 0.8mm

4-way valve

0213-Z)

(STF-

Accumulater tank

Deoxidized copper pipe
Outer dia. : 6.35mm

Thickness : 0.8mm

Muffler

Muffler

Compressor

DA150A1F-20F

INDOOR UNIT

Indoor heat

exchanger

Cross flow fan

Sectional shape
of heat insulator

TD

T1 Temp. measurement

TC

TA

difference: 10m

Allowable height

Strainer

Pulse Modulating valve
at liquid side
(CAM-BD16TCTH-2)

Max. : 20m
Min. : 2m
Chargeless : 15m
Charge : 20g/m

(16 to 20m)

Allowable pipe length

TS

TO

Split capillary

Outdoor heat
exchanger

1 -dia. 2 × 100
2 - 4 -dia. 2 × 66

1
2
3
4

Distributor

Propeller fan

OUTDOOR UNIT

TE

NOTE:

Refrigerant amount: 1.40kg

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

NOTE :

• The maximum pipe length of this air conditioner is 15m. When the pipe length exceeds 15m, the additional
charging of refrigerant, 20g per 1m for the part of pipe exceeded 15m is required. (Max. 100g)

– 20 –

7-2. Operation Data

<Cooling>

FILE NO. SVM-12070

Tempeature

condition(°C)

Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps)

27/19 35/24 18N3KVR-E 0.9 to 1.1 11 to 13 40 to 42 67

<Heating>

Tempeature Standard Heat exchanger Indoor Outdoor Compressor

condition(°C) pressure pipe temp. fan mode fan mode revolution

Indoor Outdoor P (MPa) T1 (°C) T2 (°C) (rps)

20/15 7/6 18N3KVR-E 2.5 to 2.6 40 to 42 1 to 3 79

NOTES :

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

2. Connecting piping condition : 7.5 m

Model name

RAS-

22N3KVR-E 0.9 to 1.1 11 to 13 41 to 43 77

Model name

RAS-

22N3KVR-E 2.6 to 2.8 42 to 44 0 to 2 84

Standard Heat exchanger Indoor Outdoor Compressor
pressure pipe temp. fan mode fan mode revolution

HighHigh

High High

– 21 –

8-1. Indoor Unit

FILE NO. SVM-12070

8. CONTROL BLOCK DIAGRAM

Heat Exchanger Sensor (Tc)

Room Temperature Sensor (Ta)

Infrared Rays Signal Receiver

and Indication

Initializing Circuit

Clock Frequency

Oscillator Circuit

Power Supply Circuit

Converter (D.C circuit)

Noise Filter

M.C.U.

Functions

• Cold draft preventing Function

• 3-minute Delay at Restart
for Compressor

• Fan Motor Starting Control

• Processing
(Temperature Processing)

• Timer

• Serial Signal Communication

• Clean Function

Serial Signal Transmitter/Receiver

Indoor Unit Control Unit

Louver Motor
Drive Control

Indoor Fan

Motor Control

Louver

Motor

Indoor

Fan Motor

Air purifier

unit

Micro Switch

From Outdoor Unit

220-240V~, 50Hz
220-230V~, 60Hz

REMOTE CONTROLLER

Serial Signal Communication

(Operation Command and Information)

Remote Controller

Infrared Rays, 36.7kHz

Operation ( )

Operation Mode Selection

AUTO, COOL, DRY, HEAT, FAN

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

ECO

Hi-POWER

COMFORT SLEEP

QUIET

QUIET

SLEEP (1, 3, 5, 9 OFF TIMER)

PURE (Air purifier)

– 22 –

8-2. Outdoor Unit (Inverter Assembly)

OUTDOOR UNIT

Outdoor

Fan motor

FILE NO. SVM-12070

Compressor

MICRO-COMPUTER BLOCK DIAGRAM

MCC5009 (P.C.B)

detect

Current

Gate drive

M.C.U.

• PWM synthesis function

• Input current release control

• IGBT over-current detect control

circuit

detect

Current

• Outdoor fan control

• High power factor correction control

• Inverter output frequency control

• A/D converter function

• PMV control

• Discharge temp. control

Inverter

(DC → AC)

circuit

Gate drive

Clock

frequency

• 4-way valve control

• Signal communication to indoor unit

High Power

factor Correction

4MHz

circuit

Inverter

(DC → AC)

Relay

Converter

(AC → DC)

Driver circuit

sensor

Input current

circuit

of PMV

PMV : Pulse Motor Valve

M.C.U.: Micro Control Unit

valve

4-way

PMV

220-240V~, 50Hz

220-230V~, 60Hz

For INDOOR UNIT

circuit

Indoor unit

send/receive

Discharge

temp. sensor

Outdoor air

Suction

temp. sensor

− 23 −

temp. sensor

temp.sensor

Heat exchanger

Filter

Noise

9. OPERATION DESCRIPTION

FILE NO. SVM-12070

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 in the range from 11 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 controller,
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 motor valve. (PMV)
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.

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 controller and assumes
the 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

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

• PMV 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 (Temperature
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.

– 24 –

9-2. Operation Description

1. Basic operation ........................................................................................................... 26

1. Operation control ................................................................................................... 26

2. Cooling/Heating operation ..................................................................................... 27

3. AUTO operation...................................................................................................... 27

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

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

3. Outdoor fan motor control ........................................................................................... 30

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

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

6. Release protective control by temperature of indoor heat exchanger ........................ 32

7. Defrost control (Only in heating operation)................................................................. 33

8. Louver control ............................................................................................................. 34

1) Louver position....................................................................................................... 34

2) Air direction adjustment ......................................................................................... 34

3) Swing ..................................................................................................................... 34

FILE NO. SVM-12070

9. ECO operation ............................................................................................................ 35

10. Temporary operation................................................................................................... 36

11. Discharge temperature control .................................................................................. 36

12. Pulse motor valve (PMV) control ................................................................................ 37

13. Self-Cleaning function ................................................................................................ 38

14. Remote Controller-A or B selection ............................................................................ 39

15. QUIET mode ............................................................................................................... 40

16. COMFORT SLEEP ..................................................................................................... 40

17. Short Timer ................................................................................................................. 40

18. One Touch Comfort ..................................................................................................... 41

19. Hi POWER Mode ........................................................................................................ 41

20. FILTER Indicator ......................................................................................................... 41

9-3. Auto Restart Function

9-3-1. How to Set the Auto Restart Function ........................................................................ 42

9-3-2. How to Cancel the Auto Restart Function.................................................................. 43

9-3-3. Power Failure during Timer Operation........................................................................ 43

9-4. Remote Controller

9-4-1. Remote Controller and Its Functions ........................................................................... 44

9-4-2. Operation of Remote Controller ................................................................................... 44

9-4-3. Names and Functions of Indications on Remote Controller ........................................ 47

– 25 –

FILE NO. SVM-12070

Item

1. Basic
operation

Operation flow and applicable data, etc.

1. Operation control

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 as shown in the below.

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 motor valve.

Selection of

operation conditions

ON/OFF

Remote controller

Control contents of remote controller

• ON/OFF (Air conditioner)

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

• Temperature setup

• Air direction

• Swing

• Air volume select
(AUTO / LOW / LOW+ / MED / MED+ / HIGH)

• ECO • COMFORT SLEEP

• ON timer setup • QUIET

• OFF timer setup • PRESET

• Hi-POWER • ONE-TOUCH

Description

Signal receiving

Indoor unit control

Operation command

Serial signal send/receive

Serial signal send/receive

Outdoor unit control

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

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

Inverter

• Indoor fan motor

• Louver motor

~

• Compressor

• Outdoor fan motor

• 4-way valve

• Pulse Motor valve
(PMV)

– 26 –

FILE NO. SVM-12070

Item

1. Basic
operation

Operation flow and applicable data, etc.

2. Cooling/Heating operation

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 “8. Louver control”, respectively.

3) The outdoor unit controls the outdoor fan motor, compressor, pulse motor valve and
4-way valve according to the operation signal sent from the indoor unit.

Operation ON

Indoor unit control

Sending of operation command signal

Outdoor unit control

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.

Ta

Cooling operation

Ts + 1

Monitoring (Fan)

Ts – 1

Heating operation

Setup of remote controller

Indoor fan motor control / Louver control / Operation Hz
Control (Requierment)

Compressor revolution control / Outdoor fan motor control /
Operation Hz control (Include limit control)
4-way valve control In cooling operation: ON

Pulse Motor valve control

[ ]

In heating operation: OFF

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.

Description

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 and to avoid
air flow from blowing directly to persons.

[C]

Ta

+

1.0

+

0.5

L (W5)

(W5+W3) / 2

SL (W3)

Tsc

Fan speed

– 27 –

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) + (0.0 to 1.0)

3) When the room temperature is lower
1°C or less than the setup temperature,
turn off the compressor.

FILE NO. SVM-12070

Item

2. Indoor fan
motor control

COOL ON

Fan speed setup

AUTO

Ta

[°C]

+2.5

a

+2.0

b

+1.5

c

+1.0

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)

MANUAL

Indication

L

L+

M

M+

H

(Fig. 1)

Fan speed

W6

(L + M) / 2

W9

(M + H) / 2

WC

(Fig. 2)

Air volume AUTO

M+(WB)

*3

*4

*5

*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

Description

∗∗

∗

∗ Symbols

∗∗

∗∗

UH: Ultra High
H : High
M+: Medium+
M : Medium
L+ : Low+

L : Low

L- : Low–
UL : Ultra Low

: Super Ultra Low

SUL

* 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.

d

+0.5

Ts c

L(W6)

e

(Linear approximation
from M+ and L)

(Table 1) Indoor fan air flow rate

Fan speed

level

WF UH 1100 972 1200 1080

WE H 1100 972 1200 1080
WD M+ 1090 962 1200 1080
WC H 1070 940 1180 1059

WB M+ M 980 843 1080 951
WA 940 799 1020 886

W9 M L+ 890 745 980 843

W8 L 780 626 850 702

W7 L+ L- L+ 750 594 810 659

W6 L L 740 583 800 648

W5 L- UL L- 700 540 760 605

W4 UL UL 700 540 700 540

W3 SUL SUL 650 486 650 485

W2 SUL 500 324 500 324

W1 500 324 500 324

COOL HEAT DRY

RAS-18N3KVR-E RAS-22N3KVR-E

Fan speed Air flow rate Fan speed Air flow rate

(rpm) (m3/h) (rpm) (m3/h)

– 28 –

d

O

.

5

)

)

)

.

)

g

y

g

N

1

d

8

FILE NO. SVM-12070

Item

2. Indoor fan
motor control

HEAT O

Fan speed setup

AUTO

TC ≥ 42°C

NO

Operation flow and applicable data, etc.

<In heating operation>

MANUAL

Indication Fan speed

L

L+

M

M+

H

YES

Tc

52
5

(Fig. 3)

W8

(L + M) / 2

WA

(M + H) / 2

WE

in air flow rate control

imited to Min WD tap

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.

5) In order to prevent Cold draft when
compressor step during heating
operation. Then louver will move to
upper position and fan speed will
reduce or off.

* Fan spee

(Fig. 4)

asic fan control

[°C]

TA

TSC

–0.5

d

–1.0

e

–1.5

f

–2.0

g

–2.5

–5.0

.

*1 : Fan speed = [(M+) – (L+)] x 1 4 + L+
*2 : Fan speed = [(M+) – (L+)] x 2 4 + L+

*3 : Fan speed = [(M+) – (L+)] x 3 4 + L+

(Fig. 5)

TC

(42 + a)) / 10 x (WD

Fan spee

AUT

+ (W9

*1

*2

*3

M+ (WD)

H (WE

*

o limit

W8) + W

Cold draft preventive control

Tc
46 46
45 45 33

33 33 21
32 32 20

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

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

*

o limitation while fan speed MANUAL mode is in stability

* A: When Tsc

Tsc: Set value

34

Fan speed
Fan speed AUTO in stabilit
Fan speed AUTO in startin

24, A is 24, and when Tsc < 24, A is Tsc

H (WE

ine-approximate

H and SUL with Tc

SUL (W2

Stop

ANUAL

n startin

(Fig. 6)

[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

• 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

In stability

– 29 –