Toshiba RAS-M16SMUV-E, RAS-M10SMUV-E, RAS-M16SMUCV-E, RAS-M10SMUCV-E, RAS-M13SMUV-E User Manual

SERVICE MANUAL

AIR-CONDITIONER

SPLIT TYPE

FILE NO. A06-015

INDOOR UNIT

Heat Pump Model Cooling Only Model

RAS-M10SMUV-E RAS-M10SMUCV-E
RAS-M13SMUV-E RAS-M13SMUCV-E
RAS-M16SMUV-E RAS-M16SMUCV-E

R410A

PRINTED IN JAPAN, Apr.,2007 ToMo

ADOPTION OF NEW REFRIGERANT

This Air Conditioner is a new type which adopts a new refrigerant HFC (R410A) instead of the conventional refriger­ant R22 in order to prevent destruction of the ozone layer.

WARNING

Cleaning of the air filter and other parts of the air filter involves dangerous work in high places, so be sure to have a
service person do it. Do not attempt it yourself.

The cleaning diagram for the air filter is there for the service person, and not for the customer.

CONTENTS

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

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

2-1. Combined Outdoor Unit ..................................................................................................................................5

2-2. Indoor Unit ........................................................................................................................................................6

3. REFRIGERANT R410A................................................................................................................8

3-1. Safety During Installation/Servicing ..............................................................................................................8

3-2. Refrig erant Piping Installation .....................................................................................................................8

3-3. Tools ................................................................................................................................................................12

3-4. Recharging of Refrigerant ............................................................................................................................13

3-5. Brazing of Pipes .............................................................................................................................................14

4. CONSTRUCTION VIEWS...........................................................................................................16

4-1. Indoor Unit ......................................................................................................................................................16

5. REFRIGERA TING CYCLE DIAGRAM .......................................................................................17

5-1. Indoor Unit ......................................................................................................................................................17

6. WIRING DIAGRAM .................................................................................................................... 18

6-1. Indoor Unit ......................................................................................................................................................18

7. SPECIFICA TIONS OF ELECTRICAL PARTS ...........................................................................19

7-1. Indoor Unit ......................................................................................................................................................19

8. CONTROL BLOCK DIAGRAM ..................................................................................................20

8-1. Indoor Control Circuit ...................................................................................................................................20

9. OPERATION DESCRIPTION ..................................................................................................... 21

9-1. Outline of Air Conditioner Control...............................................................................................................21

9-2. Operation Description ...................................................................................................................................22

9-3. Intermittent Operation Control for Indoor Fans of the Indoor Unit

at Thermo-off Side in Heating Operation ....................................................................................................37

9-4. Remote Controller .........................................................................................................................................38

10. INSTALLATION MANUAL..........................................................................................................40

Accessory parts and Parts to be procured locally ....................................................................................40

1 PRECAUTIONS FOR SAFETY .......................................................................................................................41

2 SELECTION OF INSTALLATION PLACE ......................................................................................................43

3 INSTALLATION OF INDOOR UNIT ................................................................................................................45

4 DRAIN PIPING WORK ....................................................................................................................................49

5 REFRIGERANT PIPING AND EVACUATING .................................................................................................52

6 EVACUATING ..................................................................................................................................................53

7 ELECTRICAL WORK ......................................................................................................................................54

8 APPLICABLE CONTROLS.............................................................................................................................57

9 TEST OPERATION..........................................................................................................................................59

10 INSTALLATION / SERVICING TOOLS ...........................................................................................................59

11 MAINTENANCE ..............................................................................................................................................60

11. HOW TO DIAGNOSE THE TROUBLE ........................................................................................61

11-1. First Confirmation............................................................................................................................................61

11-2. Primary Judgment .........................................................................................................................................62

11-3. Judgment by Flashing LED of Indoor Unit (Switch Panel) .......................................................................62

11-4. Self-Diagnosis by Remote Controller (Check Code) .................................................................................63

11-5. Judgment of Trouble by Every Symptom ....................................................................................................66

11-6. How to Check Simply the Main Parts ..........................................................................................................70

11-7. P.C. Board Layout...........................................................................................................................................71

11-8. Service P.C. Board Selection Information ...................................................................................................72

12. DETACHMENTS.........................................................................................................................73

12-1. Indoor Unit ......................................................................................................................................................73

13. EXPLODED VIEWS AND PARTS LIST ..................................................................................... 81

13-1. Ceiling Panel ..................................................................................................................................................81

14-2. 4-way Air Discharge Cassette Type .............................................................................................................82

– 2 –

1. SAFETY PRECAUTIONS

For general public use

Power supply cord of outdoor unit shall be 1.5 mm ² (H07RN-F or 60245IEC66) polychloroprene sheathed
flexible cord.

• Read this “SAFETY PRECAUTIONS” carefully before servicing.

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

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

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

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 membrane, and oils because
the working pressure of R410A 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 R410A 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 (R410A) units. For connecting pipes , use new
and clean piping materials with high pressure fittings made for R410A 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

A switch or circuit breaker that can disconnect all poles must be included in the fixed wiring.
Be sure to use an approved circuit breaker or switch.

DANGER

• ASK AN AUTHORIZED DEALER OR QUALIFIED INSTALLATION PROFESSIONAL TO INSTALL/
MAINTAIN THE AIR CONDITIONER.

INAPPROPRIATE SERVICING MAY RESULT IN WATER LEAKAGE, 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 INCOR­RECTLY 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.

– 3 –

• 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 MO VING THE AIR-CONDITIONER FOR INSTALLATION IN ANOTHER PLACE, BE VER Y CARE­FUL 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 MA Y 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 W ORK, 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.

CAUTION

• Exposure of unit to water or other moisture before installation may result 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 install in a place that can amplify
the noise level of the unit or where noise or discharged air might disturb neighbors.

• To avoid personal injury, be careful when handling parts with sharp edges.

• Perf orm the specified installation work to guard against an earthquake.

If the air conditioner is not installed appropriately, accidents may occur due to the falling unit.

For Reference:

If a heating operation would be continuously perf ormed 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.

– 4 –

2. SPECIFICATIONS

2-1. Combined Outdoor Unit

The outdoor units, which can be combined with 4-way Air Discharge Cassette indoor unit are as described
below:

2-1-1. Cooling and Heating Type

Outdoor

unit type

2-room Multi

outdoor unit

3-room Multi

outdoor unit

4-room Multi

outdoor unit

Combined outdoor unit

model name

RAS-M14GAV-E

RAS-M18GAV-E
RAS-3M18SAV-E
RAS-3M26GAV-E
RAS-4M23SAV-E

RAS-4M27GAV-E

2-1-2. Cooling only type

Outdoor

unit type

2-room Multi

outdoor unit

3-room Multi

outdoor unit

4-room Multi

outdoor unit

Combined outdoor unit

model name

RAS-M14GACV-E

RAS-M18GACV-E
RAS-3M18SACV-E
RAS-3M23GACV-E
RAS-4M23SACV-E

RAS-4M27GACV-E

Capacity rank of 4-way Air Discharge Cassette

16 class 13 class 10 class

×××

¡¡¡

¡¡¡

¡¡¡

¡¡¡

¡¡¡

: Combination available, ×: Combination unavailable

¡

Capacity rank of 4-way Air Discharge Cassette

16 class 13 class 10 class

×××

¡¡¡

¡¡¡

×××

¡¡¡

¡¡¡

Conditions

of combination

Combination unavailable

None
None
None
None

Restrict the max. pipe
length 70m to 50m

Conditions

of combination

Combination unavailable

None
None

Combination unavailable

None

Restrict the max. pipe
length 70m to 50m

: Combination available, ×: Combination unavailable

¡

This Service Manual describes about 4-way Air Discharge Cassette indoor units, RAS-M10SMUV-E,
RAS-M13SMUV-E, RAS-M16SMUV-E, RAS-M10SMUCV-E, RAS-M13SMUCV-E and RAS-M16SMUCV-E only.

For the outdoor unit, refer to the Service Manual attached to the combined outdoor unit.

Outdoor unit

RAS-M18GAV-E RAS-M18GACV-E
RAS-3M18SAV-E RAS-3M18SACV-E
RAS-4M23SAV-E RAS-4M23SACV-E

RAS-3M26GAV-E, RAS-4M27GAV-E RAS-4M27GACV-E

File No.
A05-009-1
A06-013
A06-014
A05-011

– 5 –

2-2. Indoor Unit

2-2-1. Heat Pump Model

Model

Power supply

Cooling mode

Heating mode

Fan unit

Outer Depth (mm)
dimension Height (mm)

Appearance

Total weight

Piping connection

Installable ceiling height
of indoor unit

Usable temperature range

Accessory

Indoor unit
Panel

Voltage (V)

Electrical
characteristics

Sound pressure
level

Air flow Medium (m³/min.)

Electrical
characteristics

Sound pressure
level

Air flow Medium (m³/min.)

Fan
Motor output (W)

Indoor unit Width (mm)

Panel Width (mm)

Indoor unit
Panel
Indoor unit (kg)
Panel (kg)

Indoor unit

Panel

Running current (A)
Power consumption (W)
Power factor (%)
High (dB)
Medium+ (dB)
Medium (dB)
Low+ (dB)
Low (dB)
High (m³/min.)
Medium+ (m³/min.)

Low+ (m³/min.)
Low (m³/min.)
Voltage (V)
Running current (A)
Power consumption (W)
Power factor (%)
High (dB)
Medium+ (dB)
Medium (dB)
Low+ (dB)
Low (dB)
High (m³/min.)
Medium+ (m³/min.)

Low+ (m³/min.)
Low (m³/min.)

Height (mm)

Depth (mm)

Type
Liquid side (mm)
Gas side (mm)
Drain port
Minimun (m)
Maximum (m)
Cooling (°C)
Heating (°C)
Wireless remote controller
Batteries
Remote controller holder
Mounting screw
Owner’s manual
Installation manual
Installation manual
Mounting screw

RAS-M10SMUV-E RAS-M13SMUV-E RAS-M16SMUV-E

RB-B11MC (W) E

1 phase, 50Hz 220 to 240 V, 60Hz 220 V

220/230/240 220/230/240 220/230/240

0.21/0.20/0.19 0.21/0.20/0.19 0.21/0.20/0.19
23 23 23
50 50 50
37 38 40
35 36 38
33 34 37
32 32 34
30 30 31

9.8 10.3 11.0

9.1 9.6 10.3

8.4 8.8 9.5

7.7 8.1 8.4

7.2 7.2 7.5

220/230/240 220/230/240 220/230/240

0.21/0.20/0.19 0.21/0.20/0.19 0.21/0.20/0.19
23 23 23
50 50 50
37 38 40
35 36 38
33 34 37
32 32 34
30 30 31

9.8 10.3 11.0

9.1 9.6 10.3

8.4 8.8 9.5

7.7 8.1 8.4

7.2 7.2 7.5
Turbo fan

60
268
575
575

27
700
700

Zinc hot diping steel plate

Moon-white (Muncel 2.5GY, 9.0/0.5)

15

3

Flare connection

Ø6.35

Ø9.52 Ø9.52 Ø12.7

VP25

2.5 2.5 2.5

2.7 2.7 3.5
21 to 32

0 to 29

1 (WH-H3UE)

2
1
1
1
1
1
4

– 6 –

2-2-2. Cooling Only Model

Model

Power supply

Cooling mode

Fan unit

Outer Depth (mm)
dimension Height (mm)

Appearance

Total weight

Piping connection

Installable ceiling height
of indoor unit

Usable temperature range Cooling (°C)

Accessory

Indoor unit
Panel

Voltage (V)

Electrical
characteristics

Sound pressure
level

Air flow Medium (m³/min.)

Fan
Motor output (W)

Indoor unit Width (mm)

Panel Width (mm)

Indoor unit
Panel
Indoor unit (kg)
Panel (kg)

Indoor unit

Panel

Running current (A)
Power consumption (W)
Power factor (%)
High (dB)
Medium+ (dB)
Medium (dB)
Low+ (dB)
Low (dB)
High (m³/min.)
Medium+ (m³/min.)

Low+ (m³/min.)
Low (m³/min.)

Height (mm)

Depth (mm)

Type
Liquid side (mm)
Gas side (mm)
Drain port
Minimun (m)
Maximum (m)

Wireless remote controller
Batteries
Remote controller holder
Mounting screw
Owner’s manual
Installation manual
Installation manual
Mounting screw

RAS-M10SMUCV-E RAS-M13SMUCV-E RAS-M16SMUCV-E

RB-B11MC (W) E

1 phase, 50Hz 220 to 240 V, 60Hz 220 V

220/230/240 220/230/240 220/230/240

0.21/0.20/0.19 0.21/0.20/0.19 0.21/0.20/0.19
23 23 23
50 50 50
37 38 40
35 36 38
33 34 37
32 32 34
30 30 31

9.8 10.3 11.0

9.1 9.6 10.3

8.4 8.8 9.5

7.7 8.1 8.4

7.2 7.2 7.5
Turbo fan

60
268
575
575

27
700
700

Zinc hot diping steel plate

Moon-white (Muncel 2.5GY, 9.0/0.5)

15

3

Flare connection

Ø6.35

Ø9.52 Ø9.52 Ø12.7

VP25

2.5 2.5 2.5

2.7 2.7 3.5
21 to 32

1 (WC-H2UE)

2
1
1
1
1
1
4

– 7 –

3. REFRIGERANT R410A

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

The working pressure of the new refrigerant R410A
is 1.6 times higher than conventional refrigerant
(R22). The refrigerating oil is also changed in
accordance with change of refrigerant, so be careful
that water, dust, and 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 por t
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’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.

Further more, 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.

– 8 –

Table 3-2-1 Thicknesses of annealed copper pipes

Thickness (mm)

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

– 9 –

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

Nominal

diameter

Outer

diameter

(mm)

Thickness

(mm)

Fig. 3-2-1 Flare processing dimensions

Flare tool for R410A

clutch type

ØD

A

A (mm)

Conventional flare tool

Clutch type Wing nut type

1/4
3/8
1/2
5/8

Nominal

diameter

1/4
3/8
1/2
5/8

6.35

9.52

12.70

15.88

0.8

0.8

0.8

1.0

0 to 0.5
0 to 0.5
0 to 0.5
0 to 0.5

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

Outer

diameter

(mm)

6.35

9.52

12.70

15.88

Thickness

(mm)

0.8

0.8

0.8

1.0

Flare tool for R22

clutch type

0 to 0.5
0 to 0.5
0 to 0.5
0 to 0.5

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

0.5 to 1.0 1.5 to 2.0

0.5 to 1.0 1.5 to 2.0

Nominal

diameter

1/4
3/8
1/2
5/8

Table 3-2-5 Flare and flare nut dimensions for R410A

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

– 10 –

Flare nut width

(mm)

17
22
26
29

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

45˚ to 46˚

Thickness

(mm)

0.8

0.8

0.8

1.0

1.0

B A

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

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)

Tightening torque of torque

wrenches available on the market

N•m (kgf•cm)

1/4
3/8
1/2
5/8

6.35

9.52

12.70

15.88

14 to 18 (140 to 180)
33 to 42 (330 to 420)
50 to 62 (500 to 620)
63 to 77 (630 to 770)

– 11 –

16 (160), 18 (180)

42 (420)
55 (550)
65 (650)

3-3. Tools

3-3-1. Required T ools

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

air-water heat pump installation

No.

1

2

3

4
5
6

7
8

9

10

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

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

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

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

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

Usage

Existence of
new equipment
for R410A

Yes

Yes

Yes

Yes

Yes
Yes
Yes

Yes

(Note 2)

R410A

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)

×
×

¡

¡

×

¡

×

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

– 12 –

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.

(Water heat
exchanger 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

– 13 –

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.

– 14 –

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

Copper - Iron

Iron - Iron

Used brazing filler

Phosphor copper

Silver
Silver

Used flux

Do not use

Paste flux

Vapor 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.

M

Flow meter

Stop valve

Nitrogen gas

cylinder

From Nitrogen cylinder

Pipe

Rubber plug

Fig. 3-5-1

Prevention of oxidation during brazing

Nitrogen
gas

– 15 –

4. CONSTRUCTION VIEWS

4-1. Indoor Unit

RAS-M10SMUV-E, RAS-M13SMUV-E, RAS-M16SMUV-E
RAS-M10SMUCV-E, RAS-M13SMUCV-E, RAS-M16SMUCV-E

200

1000 or more

15 or more

1000 or more

Obustacle

1000 or more

15 or more

Space required for

installation and servicing

149

175

207

64

Bottom face
of ceiling

145.5

93

Knockout for flesh
air intake 100 diam.

70

105

595 to 660 Ceiling open dimension

142 64 368.5

29

700 Panel external dimension

595 to 660 Ceiling open dimension

525 Hanging bolt pitch

Check port

( 450)

Check port

(o 450)

200

Check port

( 450)

Drain-up standing-up size

Indoor unit

627.5

or less

Stand-up

Bottom face
of ceiling

Stand-up

850 or less

Note)

As ABS is used for the drain discharge port of the main unit,
the vinyl chlor paste cannot be used.

595 to 660 Ceiling open dimension

Use the flexible hose (Band fix) included in the package.

Wireless remote controller
Heat Pump : WH-H3UE
Cooling only : WC-H2UE

63

18

Bottom face
of ceiling

Ceiling panel

70

125

Drain discharge port

Hanging bolt
M10 or W3/8
local arrange

26.5
63

58

5

Remote contollerRemote contoller holder

268 27

220.5

145.5
134

200

162

105235 235

162 diam.

For branch duct knockout
square hole 150 diam.

Bottom face of ceiling

575 Unit external dimension

Electric parts box

575 Unit external dimension

331.5

320.5

– 16 –

162

diam.

256

177

700 Panel external dimension

595 to 660 Ceiling open dimension

Refrigerant pipe
(Liquid) 6.4 diam.

Refrigerant pipe (Gas)

12.7 diam.
RAS-M16SMUV-E
RAS-M16SMUCV-E

9.5 diam.
RAS-M10SMUV-E, M13SMUV-E
RAS-M10SMUCV-E, M13SMUCV-E

214 105

97.5 42 148

139.5

190.5

Wiring
connection
port

55

9310570

For branch ductt
knockout square
hole 150 diam.

120

21

142

158

5-1. Indoor Unit

5. REFRIGERATING CYCLE DIAGRAM

Heating time
Cooling time

Distributor

Indoor unit

(Strainer
incorporated)

TC sensor

Refrigerant pipe
at liquid side
Outer diameter Ø6.4

RAS-M10SMUV-E, RAS-M10SMUCV-E
RAS-M13SMUV-E, RAS-M13SMUCV-E
RAS-M16SMUV-E, RAS-M16SMUCV-E

TCJ sensor

Air heat

exchanger

Refrigerant pipe
at gas side
Outer diameter A

To outdoor unitTo outdoor unit

Outer diameter A

Ø9.52
Ø9.52
Ø12.7

For the outdoor unit, refer to the Service Manual of the combined outdoor unit.

– 17 –

6. WIRING DIAGRAM

6-1. Indoor Unit

6-1-1. 4-way Air Discharge Cassette Type

5 5
4 4
3 3

LM2

2 2
1 1

5 5
4 4
3 3

LM1

2 2
1 1

Wireless unit

assembly

MCC-5053

FM

FS

5 5
4 4
3 3
2 2
1 1

CN202

(WHI)

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

CN34

(RED)

3 3
1 1

CN33
(WHI)

5 5
4 4
3 3
2 2
1 1

CN201

(BLU)

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

CN333

(WHI)

1 1
3 3
5 5

CN334

(WHI)

1 1

4 4
5 5

1 1
2 2

CN102

(RED)

TCJ

1 1
2 2

CN101

(BLK)

TC

TA

1 1
2 2

CN104

2

(YEL)

MCC-5056

Control P.C. Board for

Indoor Unit

DC20V
DC15V
DC12V
DC 7 V

Power

supply circuit

Motor

drive circuit

+

~~

2
3

2
1

6
5
4
3
2
1

4
3
2
1

(HA)

CN64

(GRN)

CN60
(WHI)

CN08
(WHI)

Symbol

FM
TA
TC

TCJ

LM1, LM2

DP
FS

Parts Name

Fan motor

Indoor temp. sensor

Temp. sensor
Temp. sensor
Louver motor

Drain pump motor

Float switch

RY700

1 3

CN68

1 3

(BLU)

DP

Color

Identification

RED : RED
WHI : WHITE
YEL : YELLOW
BLU : BLUE
BLK : BLACK
GRN : GREEN

– 18 –

Fuse, F301

~

, T3.15A

250V

Indoor unit

earth screw

CN67
(BLK)

220 240V

1 3
1 355

WHIBLK BLKRED

1 2 3

1 2 3

~

220V ~, 60Hz

, 50Hz

P01

Outdoor unit

earth screw

7-1. Indoor Unit

7. SPECIFICATIONS OF ELECTRICAL PARTS

No.

1

Fan motor (for indoor)

2

Thermo. sensor (TA-sensor)

3

Heat exchanger sensor (TCJ-sensor)

4

Heat exchanger sensor (TC-sensor)

5

Float switch

6

Drain pump

Parts name

Type

SWF-230-60-1R

155 mm

Ø6 mm, 1500 mm

Ø6 mm, 1400 mm

FS-0218-103

ADP-1409

Specifications

Output (Rated) 60 W, 220–240 V

10 kΩ at 25°C

10 kΩ at 25°C

10 kΩ at 25°C

– 19 –

8-1. Indoor Control Circuit

8. CONTROL BLOCK DIAGRAM

Indoor unit

Ceiling panel

Sensor display

P.C. board

(MCC-5053))

Louver

motor

Drain

pump

Indoor control P.C. board

(MCC-5056)

DC5V

DC12V

Driver

Outside output

Warning Ready

Thermo. ON

Cool/Heat Fan

CPU

EEPROM

TA sensor

TC sensor

CPU

TCJ sensor

Float input

Run

Indoor

fan motor

DC280V

220–240V,

220V, ~ 60Hz

~

50Hz

Fan motor

Power circuit

123

123

Outdoor unit

control

circuit

AC

synchronous

signal input circuit

Serial

send/receive

circuit

– 20 –

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.

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. (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.

As the compressor adopts four-pole brushless
DC motor, the frequency of the supply power
from inver ter 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

• 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.

– 21 –

9-2. Operation Description

9-2. 1. Basic operation....................................................................................................................... 23

1. Operation control............................................................................................................... 23

2. Operating mode selection when performing 2-room operation ......................................... 24

3. Cooling/Heating operation................................................................................................. 24

4. AUTO operation ................................................................................................................. 25

5. DRY operation ................................................................................................................... 25

2. Indoor fan motor control.......................................................................................................... 26

<In cooling operation> ............................................................................................................ 26

<In heating operation> (Heat pump model)............................................................................ 27

3. Release protective control by temperature of indoor heat exchanger.................................... 28

4. Dain pump control .................................................................................................................. 29

5. Over flow check control .......................................................................................................... 29

6. After-heat elimination.............................................................................................................. 29

7. Louver control ......................................................................................................................... 30

1) Louver position .................................................................................................................. 30

2) Cold draft preventive control .............................................................................................. 30

8. ECO operation ........................................................................................................................ 31

9. Hi power operation.................................................................................................................. 31

10. Temporar y operation............................................................................................................... 31

11. Forced operation stop switch.................................................................................................. 32

12. Indoor fan ON output .............................................................................................................. 33

13. Select switch on remote controller.......................................................................................... 34

14. Auto restar t function ............................................................................................................... 35

15. High ceiling select switch........................................................................................................ 35

16. Setting temperature correction switch .................................................................................... 36

9-3. Intermittent Operation Control for Indoor Fans of the Indoor Unit

at Thermo-off Side in Heating Operation...............................................................37

9-4. Remote Controller...................................................................................................38

9-4-1. Parts Name of Remote Controller ....................................................................................... 38

9-4-2. Names and Functions of Indications on Remote Controller ............................................ 39

– 22 –

Item

Operation flow and applicable data, etc.

Description

1. Basic
operation

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

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

• Temperature setup

• Air direction

• Swing

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

• ECO

• ON timer setup

• OFF timer setup

• High power

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

(P.M.V.)

– 23 –

Item

Operation flow and applicable data, etc.

Description

1. Basic
operation

2. Operating mode selection when performing 2-room operation

1) The outdoor unit operating mode conforms to the instructions of the indoor unit that was pressed first.

2) When combined operation consisting of cooling (dry) and heating, fan and heating, or cleaning
operation and heating is performed, operation conforms to the instructions of the indoor unit that
was pressed first as shown in the following table.

3) The indoor fan stops for the indoor unit that was pressed last and which instr uctions are ignored.

4) When three or four indoor units are operated concurrently, the priority is also given to operating
mode of the indoor unit which was pressed first as same as the case when two indoor units are
operated concurrently.

No.

1

2

3

4

Indoor unit

Pressed first
Pressed last
Pressed first
Pressed last
Pressed first
Pressed last
Pressed first
Pressed last

Set operating mode

Cooling (dry)
Cooling (dry)

Heating
Heating

Cooling (dry)

Heating
Heating

Cooling (dry)

Actual indoor unit operation

Cooling (dry)
Cooling (dry)

Heating
Heating

Cooling (dry)

Fan stopped

Heating

Fan stopped

Actual outdoor unit operation

Cooling

Heating

Cooling

Heating

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

*1. The power coupler of 4-way valve is usually turned off, and it is turned on during defrost

operation. (Only in heating)

Operation ON

Indoor unit control

Setup of remote controller

Indoor fan motor control / Louver control

Sending of operation command signal

Compressor revolution control / Outdoor fan motor control / 4-way valve control

Outdoor unit control

[In cooling operation: OFF, In heating operation: ON]
Pulse motor valve control

– 24 –

Item

Operation flow and applicable data, etc.

Description

1. Basic
operation

4. 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.

Ta

Cooling operation

Ts + 1

Monitoring (Fan)

Ts – 1

Heating operation (Heat pump model)
Fan only operation (Cooling-only model)

*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.

5. 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 lower ing of the room temperature and to avoid
air flow from blowing directly to persons.

[˚C]

+

Ta

1.0

L– (W6)

(W6+W3) / 2

+

0.5

Tsc

SL (W3)

Fan speed

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.

– 25 –

Item

Operation flow and applicable data, etc.

Description

2. Indoor fan
motor control

COOL ON

Fan speed setup

AUTO

Ta

[˚C]

+2.5

a

+2.0

b

+1.5

c

+1.0

d

+0.5

e

Tsc

<In cooling operation>

(This operation controls the fan speed at indoor unit side.)
The indoor fan (Turbo fan) is operated by DC motor.

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

MANUAL

(Fig. 1)

Indication Fan speed

W6

(L + M) / 2

W9

(M + H) / 2

WC

(Fig. 2)

L
L+
M
M+
H

Air volume AUTO

M+(WB)

*3
*4
*5

L(W6)

*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 approximation
from M+ and L)

* 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.

Fan speed

level

WF
WE
WD
WC
WB
WA
W9
W8
W7
W6
W5
W4
W3
W2
W1

Fan speed

level

WF
WE
WD
WC
WB
WA
W9
W8
W7
W6
W5
W4
W3
W2
W1

COOL

FAN

ONLY

UH

H

M+

M

L+

L

L–

UL
SL

(Table 1) Indoor fan air flow rate (Cool/Dry/Fan only)

DRY

L–
UL

SL

RAS-M10SMUV-E

RAS-M10SMUCV-E

Fan speed Air flow rate

(rpm) (m

650 590
650 590
650 590
630 570
600 540
570 500
550 480
530 460
500 430
480 410
450 380
370 290
350 270
350 270
350 270

3

/h)

RAS-M13SMUV-E

RAS-M13SMUCV-E

Fan speed Air flow rate

(rpm) (m

680 620
680 620
680 620
630 570
600 540
590 530
550 480
530 460
500 430
480 410
450 380
370 290
350 270
350 270
350 270

(Table 2) Indoor fan air flow rate (Heat)

HEAT

UH

H

M+

M

L+

L

L–

UL

SL

RAS-M10SMUV-E

Fan speed Air flow rate

(rpm) (m

700 640
650 590
640 580
620 560
600 540
570 500
550 480
520 450
500 430
450 380
440 370
420 350
400 330
370 290
350 270

3

/h)

RAS-M13SMUV-E

Fan speed Air flow rate

(rpm) (m

730 670
680 620
640 580
620 560
600 540
590 530
560 490

530 460

500 430
450 380
440 370
420 350
400 330
370 290
350 270

RAS-M16SMUV-E

RAS-M16SMUCV-E

3

/h)

3

/h)

Fan speed Air flow rate

(rpm) (m

720 660
720 660
720 660
680 620
650 590
630 570
600 540
550 480
520 450
500 430
450 380
370 290
350 270
350 270
350 270

RAS-M16SMUV-E

Fan speed Air flow rate

(rpm) (m

750 690
720 660
690 630
670 610
650 590
630 570
600 540
550 480
520 450
470 400
450 380
420 350
400 330
370 290
350 270

3

/h)

3

/h)

– 26 –