FILE NO.

SVM-07034-2

SERVICE MANUAL

SPLIT TYPE
Indoor Unit
<High Wall, Heat Pump Type>

RAS-M07SKV-E
RAS-M10SKV-E
RAS-M13SKV-E
RAS-M16SKV-E
<High Wall, Cooling Type>

RAS-M10SKCV-E
RAS-M13SKCV-E
RAS-M16SKCV-E

R410A
Revised May, 2009
 CONTENTS

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

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

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

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

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

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

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

8. CONTROL BLOCK DIAGRAM ................................................................ 21

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

10. INSTALLATION PROCEDURE ................................................................ 47

11. HOW TO DIAGNOSE THE TROUBLE ...................................................... 55

12. HOW TO REPLACE THE MAIN PARTS ................................................... 74

13. EXPLODED VIEWS AND PARTS LIST ................................................... 83

–2–
 1. SAFETY PRECAUTIONS

For general public use

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

• Read this “SAFETY PRECAUTIONS” carefully before servicing.

• The precautions described below include the important items regarding safety. Observe them without fail.
• After the servicing work, perform a trial operation to check for any problem.
• Turn off the main power supply switch (or 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
This appliance must be connected to the main power supply by a circuit breaker or a switch with a contact
separation of at least 3 mm.

DANGER
• ASK AN AUTHORIZED DEALER OR QUALIFIED INSTALLATION PROFESSIONAL TO IN-
STALL/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 INCOR-

RECTLY CONNECTED, ELECTRIC PARTS MAY BE DAMAGED.
• CHECK THAT THE EARTH WIRE IS NOT BROKEN OR DISCONNECTED BEFORE SERVICE AND
INSTALLATION. FAILURE TO DO SO MAY CAUSE ELECTRIC SHOCK.

–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 MOVING THE AIR-CONDITIONER FOR INSTALLATION IN ANOTHER PLACE, BE VERY CARE-
FUL NOT TO ALLOW THE SPECIFIED REFRIGERANT (R410A) TO BECOME MIXED WITH ANY
OTHER GASEOUS BODY INTO THE REFRIGERATION CIRCUIT. IF AIR OR ANY OTHER GAS IS
MIXED IN THE REFRIGERANT, THE GAS PRESSURE IN THE REFRIGERATION CIRCUIT WILL
BECOME ABNORMALLY HIGH AND IT MAY RESULT IN THE PIPE BURSTING AND POSSIBLE PER-
SONNEL INJURIES.
• IN THE EVENT THAT THE REFRIGERANT GAS LEAKS OUT OF THE PIPE DURING THE SERVICE
WORK AND THE INSTALLATION WORK, IMMEDIATELY LET FRESH AIR INTO THE ROOM. IF THE
REFRIGERANT GAS IS HEATED, SUCH AS BY FIRE, GENERATION OF POISONOUS GAS MAY
RESULT.

WARNING
• Never modify this unit by removing any of the safety guards or bypass any of the safety interlock
switches.
• Do not install in a place which cannot bear the weight of the unit. Personal injury and property
damage can result if the unit falls.
• After the installation work, confirm that refrigerant gas does not leak.
If refrigerant gas leaks into the room and flows near a fire source, such as a cooking range, noxious gas
may generate.
• The electrical work must be performed by a qualified electrician in accordance with the Installation
Manual. Make sure the air conditioner uses an exclusive circuit.
An insufficient circuit capacity or inappropriate installation may cause fire.
• When wiring, use the specified cables and connect the terminals securely to prevent external
forces applied to the cable from affecting the terminals.
• Be sure to provide grounding.
Do not connect ground wires to gas pipes, water pipes, lightning rods or ground wires for telephone cables.
• Conform to the regulations of the local electric company when wiring the power supply.
Inappropriate grounding may cause electric shock.

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.
• Perform 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 performed for a long time under the condition that the outdoor
temperature is 0°C or lower, drainage of defrosted water may be difficult due to freezing of the bottom plate,
resulting in a trouble of the cabinet or fan.
It is recommended to procure an antifreeze heater locally for a safe installation of the air conditioner.
For details, contact the dealer.

–4–
 Revised-2

2. Specifications

2-1. Combined Outdoor Unit

The outdoor units, which can be combined with M**SKV-E series indoor unit are as described below:

2-2-1. Heatpump type

Outdoor Combined outdoor unit Indoor unit model name

unit type model name M16SKV-E M13SKV-E M10SKV-E M07SKV-E
2-room Multi RAS-M14GAV-E X X
outdoor unit RAS-M18GAV-E X
3-room Multi RAS-3M18SAV-E X
outdoor unit RAS-3M26GAV-E1
4-room Multi RAS-4M23SAV-E X
outdoor unit RAS-4M27GAV-E1

: Combination available
X : Combination unavailable

2-2-2. Cooling only type

Outdoor Combined outdoor unit Indoor unit model name

unit type model name M16SKCV-E M13SKCV-E M10SKCV-E
2-room Multi RAS-M14GACV-E X
outdoor unit RAS-M18GACV-E
3-room Multi RAS-3M18SACV-E
outdoor unit RAS-3M23GACV-E
4-room Multi RAS-4M23SACV-E
outdoor unit RAS-4M27GACV-E

: Combination available
X : Combination unavailable

This service manual describes about M**SKV-E series indoor units, RAS-M07SKV-E,RAS-M10SKV-E,
RAS-M13SKV-E,RAS-M16SKV-E,RAS-M10SKCV-E,RAS-M13SKCV-E and RAS-M16SKCV-E only.
For the multi outdoor unit to be combined, refer to the service manual.

Outdoor unit
File name
Heat Pump Model Cooling only model
RAS-M14GAV-E RAS-M14GACV-E
A05-009-1
RAS-M18GAV-E RAS-M18GACV-E
RAS-3M18SAV-E RAS-3M18SACV-E A06-013
RAS-3M23GACV-E A05-014-1
RAS-4M23SAV-E RAS-4M23SACV-E A06-014
RAS-3M26GAV-E,RAS-4M27GAV-E RAS-4M27GACV-E A05-011-1

–5–
 Revised-2

Specifications

Unit model Indoor RAS-M07SKV-E, RAS-M10SKV-E, RAS-M13SKV-E, RAS-M16SKV-E

Outdoor ∗1
Cooling capacity (kW) ∗1
Cooling capacity range (kW) ∗1
Heating capacity (kW) ∗1
Heating capacity range (kW) ∗1
Power supply 220~240V-1Ph-50Hz / 220V-1Ph-60Hz
Electric Indoor Unit model RAS-M07SKV-E RAS-M10SKV-E RAS-M13SKV-E RAS-M16SKV-E
characteristic Running current (A) 0.21-0.19 0.21-0.19 0.21-0.19 0.21-0.19
Power consumption (W) 35 35 35 30
Power factor (%) 75 75 75 65
Outdoor Operation mode Cooling Heating Cooling Heating Cooling Heating Cooling Heating
Running current (A) ∗1 ∗1 ∗1 ∗1 ∗1 ∗1 ∗1 ∗1
Power consumption (W) ∗1 ∗1 ∗1 ∗1 ∗1 ∗1 ∗1 ∗1
Power factor (%) ∗1 ∗1 ∗1 ∗1 ∗1 ∗1 ∗1 ∗1
Starting current (A) ∗1 ∗1 ∗1 ∗1 ∗1 ∗1 ∗1 ∗1
COP(Cooling/Heating) ∗1 ∗1 ∗1 ∗1 ∗1 ∗1 ∗1 ∗1
Operating Indoor Unit model RAS-M07SKV-E RAS-M10SKV-E RAS-M13SKV-E RAS-M16SKV-E
noise (Cooling/ High 38/38 38/39 39/40 45/45
dB(A) Heating) Medium 33/33 33/34 33/34 40/40
Low 26/28 26/28 26/28 30/31
Outdoor Cooling ∗1
Heating ∗1
Indoor unit Unit model RAS-M07SKV-E RAS-M10SKV-E RAS-M13SKV-E RAS-M16SKV-E
Dimension Height 275 275 275 275
(mm) Width 790 790 790 790
Depth 205 205 205 205
Net weight (kg) 9 9 9 9
Fan motor output (W) 20 20 20 30
Air flow rate (m3/h) (Cooling/Heating) 8.6/9.5 8.6/9.5 9.4/10.5 11.5/12.4
Outdoor unit Dimension Height ∗1
(mm) Width ∗1
Depth ∗1
Net weight (kg) ∗1
Compressor Motor output (W) ∗1
Type ∗1
Model ∗1
Fan motor output (W) ∗1
Air flow rate (m3/h) (Cooling/Heating) ∗1
Type Flare connection
Piping Indoor unit Unit model RAS-M07SKV-E RAS-M10SKV-E RAS-M13SKV-E RAS-M16SKV-E
connection ∅6.35 ∅6.35 ∅6.35 ∅6.35
∅9.52 ∅9.52 ∅9.52 ∅12.7
Outdoor unit Liquid side ∗1
Gas side ∗1
Maximum length (per unit) (m) ∗1
Minimum length (per unit) (m) ∗1
Maximum length (total) (m) ∗1
Maximum chargeless length (m) ∗1
Additional refriderant ∗1
Maximum height difference (m) ∗1
Name of refrigerant R410A
Weight (kg) ∗1
Wiring connection Power supply 3 Wires : includes earth
Interconnection 4 Wires : includes earth
Usable temperature range (° Indoor (Cooling/Heating) 21 - 32/ -
Outdoor (Cooling/Heating) ∗1
Accessory Indoor unit Installation plate 1
Wireless remote control 1
Remote control holder 1
Pan head wood screw 2(∅3.1 x 16L)
Super Oxi Deo filter 1
Super Sterilizer filter 1
Battery 2
Mounting screw 6(∅4 x 25L)
Owner's manual 1
Installation manual 1

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

Note
The specifications may be subject to change without notice for purpose of improvement.

–6–
 Revised-2

Unit model Indoor RAS-M10SKCV-E, RAS-M13SKCV-E, RAS-M16SKCV-E

Outdoor ∗1
Cooling capacity (kW) ∗1
Cooling capacity range (kW) ∗1
Heating capacity (kW) −
Heating capacity range (kW) −
Power supply 220~240V-1Ph-50Hz / 220V-1Ph-60Hz
Electric Indoor Unit model RAS-M10SKCV-E RAS-M13SKCV-E RAS-M16SKCV-E
characteristic Running current (A) 0.21-0.19 0.21-0.19 0.21-0.19
Power consumption (W) 35 35 30
Power factor (%) 75 75 65
Outdoor Operation mode Cooling Heating
Running current (A) ∗1 −
Power consumption (W) ∗1 −
Power factor (%) ∗1 −
Starting current (A) ∗1 −
COP(Cooling/Heating) ∗1 −
Operating Indoor Unit model RAS-M10SKCV-E RAS-M13SKCV-E RAS-M16SKCV-E
noise (Cooling/ High 38/- 39/- 45/-
dB(A) Heating) Medium 33/- 33/- 40/-
Low 26/- 26/- 30/-
Outdoor Cooling ∗1
Heating −
Indoor unit Unit model RAS-M10SKCV-E RAS-M13SKCV-E RAS-M16SKCV-E
Dimension Height 275 275 275
(mm) Width 790 790 790
Depth 205 205 205
Net weight (kg) 9 9 9
Fan motor output (W) 20 20 30
Air flow rate (m3/h) (Cooling/Heating) 8.6/- 9.4/- 11.5/-
Outdoor unit Dimension Height ∗1
(mm) Width ∗1
Depth ∗1
Net weight (kg) ∗1
Compressor Motor output (W) ∗1
Type ∗1
Model ∗1
Fan motor output (W) ∗1
Air flow rate (m3/h) (Cooling/Heating) ∗1
Type Flare connection
Piping Indoor unit Unit model RAS-M10SKCV-E RAS-M13SKCV-E RAS-M16SKCV-E
connection ∅6.35 ∅6.35 ∅6.35
∅9.52 ∅9.52 ∅12.7
Outdoor unit Liquid side ∗1
Gas side ∗1
Maximum length (per unit) (m) ∗1
Minimum length (per unit) (m) ∗1
Maximum length (total) (m) ∗1
Maximum chargeless length (m) ∗1
Additional refriderant ∗1
Maximum height difference (m) ∗1
Name of refrigerant R410A
Weight (kg) ∗1
Wiring connection Power supply 3 Wires : includes earth
Interconnection 4 Wires : includes earth
Usable temperature range (°C) Indoor (Cooling/Heating) 21 - 32/ -
Outdoor (Cooling/Heating) ∗1
Accessory Indoor unit Installation plate 1
Wireless remote control 1
Remote control holder 1
Pan head wood screw 2(∅3.1 x 16L)
Super Oxi Deo filter 1
Super Sterilizer filter 1
Battery 2
Mounting screw 6(∅4 x 25L)
Owner's manual 1
Installation manual 1

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

Note
The specifications may be subject to change without notice for purpose of improvement.

–7–
 3. REFRIGERANT R410A
This air conditioner adopts the new refrigerant HFC 6. When an air conditioning system charged with a
(R410A) which does not damage the ozone layer. large volume of refrigerant is installed in a small
The working pressure of the new refrigerant R410A room, it is necessary to exercise care so that,
is 1.6 times higher than conventional refrigerant even when refrigerant leaks, its concentration
(R22). The refrigerating oil is also changed in does not exceed the marginal level.
accordance with change of refrigerant, so be careful If the refrigerant gas leakage occurs and its
that water, dust, and existing refrigerant or refrigerat- concentration exceeds the marginal level, an
ing oil are not entered in the refrigerant cycle of the oxygen starvation accident may result.
air conditioner using the new refrigerant during 7. Be sure to carry out installation or removal
installation work or servicing time. according to the installation manual.
The next section describes the precautions for air Improper installation may cause refrigeration
conditioner using the new refrigerant. Conforming to trouble, water leakage, electric shock, fire, etc.
contents of the next section together with the
8. Unauthorized modifications to the air conditioner
general cautions included in this manual, perform
may be dangerous. If a breakdown occurs
the correct and safe work.
please call a qualified air conditioner technician
or electrician.
3-1. Safety During Installation/Servicing Improper repair’s may result in water leakage,
As R410A’s pressure is about 1.6 times higher than electric shock and fire, etc.
that of R22, improper installation/servicing may
cause a serious trouble. By using tools and materi- 3-2. Refrigerant Piping Installation
als exclusive for R410A, it is necessary to carry out
installation/servicing safely while taking the following 3-2-1. Piping Materials and Joints Used
precautions into consideration. For the refrigerant piping installation, copper pipes
1. Never use refrigerant other than R410A in an air and joints are mainly used. Copper pipes and joints
conditioner which is designed to operate with suitable for the refrigerant must be chosen and
R410A. installed. Furthermore, it is necessary to use clean
If other refrigerant than R410A is mixed, pressure copper pipes and joints whose interior surfaces are
in the refrigeration cycle becomes abnormally less affected by contaminants.
high, and it may cause personal injury, etc. by a 1. Copper Pipes
rupture.
It is necessary to use seamless copper pipes
2. Confirm the used refrigerant name, and use tools which are made of either copper or copper alloy
and materials exclusive for the refrigerant R410A. and it is desirable that the amount of residual oil
The refrigerant name R410A is indicated on the is less than 40 mg/10 m. Do not use copper
visible place of the outdoor unit of the air condi- pipes having a collapsed, deformed or discolored
tioner using R410A as refrigerant. To prevent portion (especially on the interior surface).
mischarging, the diameter of the service port Otherwise, the expansion valve or capillary tube
differs from that of R22. may become blocked with contaminants.
3. If a refrigeration gas leakage occurs during As an air conditioner using R410A incurs pres-
installation/servicing, be sure to ventilate fully. sure higher than when using R22, it is necessary
If the refrigerant gas comes into contact with fire, to choose adequate materials.
a poisonous gas may occur. Thicknesses of copper pipes used with R410A
4. When installing or removing an air conditioner, do are as shown in Table 3-2-1. Never use copper
not allow air or moisture to remain in the refrig- pipes thinner than 0.8 mm even when it is
eration cycle. Otherwise, pressure in the refrig- available on the market.
eration 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.

–8–
 Table 3-2-1 Thicknesses of annealed copper pipes

Thickness (mm)

Nominal diameter Outer diameter (mm) R410A R22

1/4 6.35 0.80 0.80

3/8 9.52 0.80 0.80

1/2 12.70 0.80 0.80

5/8 15.88 1.00 1.00

2. Joints
For copper pipes, flare joints or 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

Reference outer diameter of Minimum joint thickness

Nominal diameter
copper pipe jointed (mm) (mm)

1/4 6.35 0.50

3/8 9.52 0.60

1/2 12.70 0.70

5/8 15.88 0.80

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.
ØD
By means of the clamp bar, perform the flare A
processing correctly.
Use either a flare tool for R410A or conven-
tional flare tool.
Flare processing dimensions differ according
to the type of flare tool. When using a con-
ventional flare tool, be sure to secure “dimen-
sion A” by using a gauge for size adjustment. Fig. 3-2-1 Flare processing dimensions

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

A (mm)
Nominal Outer Thickness
diameter Flare tool for R410A Conventional flare tool
diameter (mm) (mm)
clutch type Clutch type Wing nut type

1/4 6.35 0.8 0 to 0.5 1.0 to 1.5 1.5 to 2.0

3/8 9.52 0.8 0 to 0.5 1.0 to 1.5 1.5 to 2.0

1/2 12.70 0.8 0 to 0.5 1.0 to 1.5 2.0 to 2.5

5/8 15.88 1.0 0 to 0.5 1.0 to 1.5 2.0 to 2.5

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

A (mm)
Nominal Outer Thickness
diameter Flare tool for R22 Conventional flare tool
diameter (mm) (mm)
clutch type Clutch type Wing nut type

1/4 6.35 0.8 0 to 0.5 0.5 to 1.0 1.0 to 1.5

3/8 9.52 0.8 0 to 0.5 0.5 to 1.0 1.0 to 1.5

1/2 12.70 0.8 0 to 0.5 0.5 to 1.0 1.5 to 2.0

5/8 15.88 1.0 0 to 0.5 0.5 to 1.0 1.5 to 2.0

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

Nominal Outer diameter Thickness Dimension (mm) Flare nut width

diameter (mm) (mm) A B C D (mm)

1/4 6.35 0.8 9.1 9.2 6.5 13 17

3/8 9.52 0.8 13.2 13.5 9.7 20 22

1/2 12.70 0.8 16.6 16.0 12.9 23 26

5/8 15.88 1.0 19.7 19.0 16.0 25 29

– 10 –
 Table 3-2-6 Flare and flare nut dimensions for R22

Nominal Outer diameter Thickness Dimension (mm) Flare nut width

diameter (mm) (mm) A B C D (mm)

1/4 6.35 0.8 9.0 9.2 6.5 13 17

3/8 9.52 0.8 13.0 13.5 9.7 20 22

1/2 12.70 0.8 16.2 16.0 12.9 20 24

5/8 15.88 1.0 19.7 19.0 16.0 23 27

3/4 19.05 1.0 23.3 24.0 19.2 34 36

6˚
to 4
45˚

B A C D

43˚
to 4
5˚

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 tighten-
ing 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]

Tightening torque of torque

Nominal Outer diameter Tightening torque
wrenches available on the market
diameter (mm) N•m (kgf•cm)
N•m (kgf•cm)

1/4 6.35 14 to 18 (140 to 180) 16 (160), 18 (180)

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

1/2 12.70 50 to 62 (500 to 620) 55 (550)

5/8 15.88 63 to 77 (630 to 770) 65 (650)

– 11 –
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
R410A Conventional air-water
air-water heat pump installation heat pump installation
No. Used tool Usage Existence of Whether conven- Whether new equipment
new equipment tional equipment can be used with
for R410A can be used conventional refrigerant
1 Flare tool Pipe flaring Yes *(Note 1) ¡
Copper pipe gauge for
Flaring by
2 adjusting projection Yes *(Note 1) *(Note 1)
conventional flare tool
margin

3
Torque wrench
(For Ø12.7)
Connection of flare nut Yes × ×
4 Gauge manifold Evacuating, refrigerant
5 Charge hose charge, run check, etc.
Yes × ×
6 Vacuum pump adapter Vacuum evacuating Yes × ¡
7
Electronic balance for
refrigerant charging
Refrigerant charge Yes × ¡
8 Refrigerant cylinder Refrigerant charge Yes × ×
9 Leakage detector Gas leakage check Yes × ¡
10 Charging cylinder Refrigerant charge (Note 2) × ×
(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 4. Reamer 9. Hole core drill (Ø65)
Use vacuum pump by attaching 5. Pipe bender 10. Hexagon wrench
vacuum pump adapter. (Opposite side 4mm)
6. Level vial
2. Torque wrench (For Ø6.35, Ø9.52) 11. Tape measure
7. Screwdriver (+, –)
3. Pipe cutter 12. Metal saw
8. Spanner or Monkey wrench

Also prepare the following equipments for other installation method and run check.
1. Clamp meter 3. Insulation resistance tester
2. Thermometer 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.
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
Connect the charge hose to packed valve service power switch.
port at the outdoor unit’s gas side.

Keep the status as it is for 1 to 2 minutes, and ensure

Connect the charge hose to the vacuum pump that the compound gauge’s pointer does not return.
adapter.

Set the refrigerant cylinder to the electronic balance,

Open fully both packed valves at liquid and gas connect the connecting hose to the cylinder and the
sides. connecting port of the electronic balance, and charge
liquid refrigerant.

(For refrigerant charging, see the figure below.)

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.

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
(Outdoor unit)
exchanger unit)

Opened

Refrigerant cylinder
(with siphon)

Check valve
Opened

Opened
Open/close Closed
valve for charging

Service port
Electronic balance for refrigerant charging

Fig. 3-4-1 Configuration of refrigerant charging

– 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 Gauge manifold
OUTDOOR unit OUTDOOR unit

cylinder
Refrigerant
Refrigerant
cylinder

Electronic Electronic
balance balance

Siphon

R410A refrigerant is HFC mixed refrigerant.

Therefore, if it is charged with gas, the composi-
tion of the charged refrigerant changes and the
characteristics of the equipment varies.

Fig. 3-4-2

3-5. Brazing of Pipes

1. Phosphor bronze brazing filler tends to react
3-5-1. Materials for Brazing with sulfur and produce a fragile compound
water solution, which may cause a gas
1. Silver brazing filler leakage. Therefore, use any other type of
Silver brazing filler is an alloy mainly composed brazing filler at a hot spring resort, etc., and
of silver and copper. It is used to join iron, copper coat the surface with a paint.
or copper alloy, and is relatively expensive though 2. When performing brazing again at time of
it excels in solderability. servicing, use the same type of brazing filler.
2. Phosphor bronze brazing filler
Phosphor bronze brazing filler is generally used
to join copper or copper alloy. 3-5-2. Flux

3. Low temperature brazing filler 1. Reason why flux is necessary

Low temperature brazing filler is generally called • By removing the oxide film and any foreign
solder, and is an alloy of tin and lead. Since it is matter on the metal surface, it assists the flow
weak in adhesive strength, do not use it for of brazing filler.
refrigerant pipes. • 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 3-5-3. Brazing
• Activated temperature of flux coincides with the As brazing work requires sophisticated techniques,
brazing temperature. experiences based upon a theoretical knowledge, it
• Due to a wide effective temperature range, flux must be performed by a person qualified.
is hard to carbonize. In order to prevent the oxide film from occurring in
• It is easy to remove slag after brazing. the pipe interior during brazing, it is effective to
• The corrosive action to the treated metal and proceed with brazing while letting dry Nitrogen gas
brazing filler is minimum. (N2) flow.
• It excels in coating performance and is harm-
less to the human body.
As the flux works in a complicated manner as Never use gas other than Nitrogen gas.
described above, it is necessary to select an
1. Brazing method to prevent oxidation
adequate type of flux according to the type and
shape of treated metal, type of brazing filler and 1) Attach a reducing valve and a flow-meter to
brazing method, etc. the Nitrogen gas cylinder.
2) Use a copper pipe to direct the piping mate-
3. Types of flux rial, and attach a flow-meter to the cylinder.
• Noncorrosive flux 3) Apply a seal onto the clearance between the
Generally, it is a compound of borax and boric piping material and inserted copper pipe for
acid. Nitrogen in order to prevent backflow of the
It is effective in case where the brazing tem- Nitrogen gas.
perature is higher than 800°C. 4) When the Nitrogen gas is flowing, be sure to
• Activated flux keep the piping end open.
Most of fluxes generally used for silver brazing 5) Adjust the flow rate of Nitrogen gas so that it
are this type. is lower than 0.05 m3/Hr or 0.02 MPa
It features an increased oxide film removing (0.2kgf/cm2) by means of the reducing valve.
capability due to the addition of compounds 6) After performing the steps above, keep the
such as potassium fluoride, potassium chloride Nitrogen gas flowing until the pipe cools down
and sodium fluoride to the borax-boric acid to a certain extent (temperature at which
compound. pipes are touchable with hands).
4. Piping materials for brazing and used 7) Remove the flux completely after brazing.
brazing filler/flux

Piping material Used brazing filler Used flux

Copper - Copper Phosphor copper Do not use

M Flow meter
Copper - Iron Silver Paste flux

Iron - Iron Silver Vapor flux

Stop valve

Nitrogen gas
1. Do not enter flux into the refrigeration cycle. cylinder

2. When chlorine contained in the flux remains From Nitrogen cylinder

within the pipe, the lubricating oil deteriorates.
Therefore, use a flux which does not contain
chlorine. Pipe
Nitrogen
3. When adding water to the flux, use water gas
which does not contain chlorine (e.g. distilled
water or ion-exchange water). Rubber plug
4. Remove the flux after brazing.

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

– 15 –
 Revised-2
4. CONSTRUCTION VIEWS
RAS-M07SKV-E, RAS-M10SKV-E, RAS-M13SKV-E, RAS-M16SKV-E
RAS-M10SKCV-E, RAS-M13SKCV-E, RAS-M16SKCV-E
790

Front panel Air filter Air inlet 205

275
63

63
48 Heat exchanger 48

7
7

Knock out system Knock out system

49
62 69
116 480 193
Installation plate hanger

157
56 19
Wireless remote controller

Installation plate hanger Drain hose (0.50m)

Connecting pipe (0.35m) Connecting pipe (0.40m)

125
(For 07,10,13 series; Flare 9.52mm) (Flare 6.35mm)
(For 16 series; Flare 12.7mm)
84.5 621 84.5 63 26
235 235
215 215 Remote controller holder
Minimum
65 or more

Hanger distance
to ceiling
45

Minimum Minimum
distance distance
to wall to wall
275

190

170 or more 170 or more

40

40

Hanger Hanger
84.5 150 160.5 160.5 150 84.5
Center line Installation plate outline

– 16 –
 Revised-2

5. WIRING DIAGRAM
5-1. RAS-M07SKV-E, RAS-M10SKV-E, RAS-M13SKV-E,
RAS-M10SKCV-E, RAS-M13SKCV-E

– 17 –
 Revised-2

5-2. RAS-M16SKV-E
RAS-M16SKCV-E

– 18 –
 Revised-2

6. SPECIFICATIONS OF ELECTRICAL PARTS

Indoor Unit

No. Parts name Type Specifications

M07SKV-E, M10SKV-E,
Fan motor M13SKV-E, M10SKCV-E, AFS-220-20-4AR AC240V, 20W
1 M13SKCV-E
(for indoor)
M16SKV-E, M16SKCV-E ICF-340-30-2B DC 340V, 30W
2 Room temp. sensor (TA-sensor) (−) 10kΩ at 25°C
3 Heat exchanger temp. sensor (TC-sensor) (−) 10kΩ at 25°C
4 Louver motor MP24Z3T Output (Rated) 1W, 16 poles, DC12V

– 19 –
 Revised-2

7. REFRIGERANT CYCLE DIAGRAM

T1 Temp. measurement
INDOOR UNIT
Indoor heat TCJ
exchanger

TC

Allowable pipe length

Allowable height
difference : 10m
Cross flow fan TA
Max. : ∗1
Min. : ∗1
P Pressure measurement
Deoxidized copper pipe Chargeless : ∗1
Gauge attaching port Outer dia. : 6.35mm Charge : ∗1
Vacuum pump connecting port Thickness : 0.8mm
Sectional shape
Deoxidized copper pipe of heat insulator
Outer dia. : 9.52mm
Thickness : 0.8mm

M16SKV-E, M16SKCV-E
Deoxidized copper pipe
Outer dia. : 12.7mm
Thickness : 0.8mm

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

– 20 –
 Revised-2

8. CONTROL BLOCK DIAGRAM

8-1. Indoor Unit

RAS-M07SKV-E, RAS-M10SKV-E, RAS-M13SKV-E, RAS-M16SKV-E

Heat Exchanger Sensor (Tcj) M.C.U. Indoor Unit Control Unit

Functions Louver
Heat Exchanger Sensor (Tc) Motor
• Cold draft preventing Function
Room Temperature Sensor (Ta)
Louver Motor
• 3-minute Delay at Restart for Compressor Drive Control
Infrared Rays Signal Receiver
and Indication • Fan Motor Starting Control
Indoor Fan
• Processing Motor Control
Initializing Circuit (Temperature Processing)

• Timer Indoor
Clock Frequency Fan Motor
Oscillator Circuit • Serial Signal Communication

• Clean Function

Power Supply
Circuit

Converter
(D.C circuit)

Noise Filter Serial Signal Transmitter/Receiver

From Outdoor Unit

220-240V ~50Hz Serial Signal Communication
220V ~60Hz (Operation Command and Information)

Remote Controller Infrared Rays, 36.7kHz

REMOTE CONTROLLER
Operation (START/STOP)

Operation Mode Selection

AUTO, COOL, DRY, HEAT

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

ECO

Hi-POWER

COMFORT SLEEP

QUIET

– 21 –
RAS-M10SKCV-E, RAS-M13SKCV-E, RAS-M16SKCV-E

M.C.U. Indoor Unit Control Unit

Heat Exchanger Sensor (Tcj)
Functions Louver
Heat Exchanger Sensor (Tc) Motor
• Cold draft preventing Function
Room Temperature Sensor (Ta)
Louver Motor
• 3-minute Delay at Restart for Compressor Drive Control
Infrared Rays Signal Receiver
and Indication • Fan Motor Starting Control
Indoor Fan
• Processing Motor Control
Initializing Circuit (Temperature Processing)

• Timer Indoor
Clock Frequency Fan Motor
Oscillator Circuit • Serial Signal Communication

• Clean Function

Power Supply
Circuit

Converter
(D.C circuit)

Noise Filter Serial Signal Transmitter/Receiver

From Outdoor Unit

220-240V ~50Hz Serial Signal Communication
220V ~60Hz (Operation Command and Information)

Remote Controller Infrared Rays, 36.7kHz

REMOTE CONTROLLER
Operation (START/STOP)

Operation Mode Selection

AUTO, COOL, DRY, Fan only

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

ECO

Hi-POWER

COMFORT SLEEP

QUIET

– 22 −
 9. OPERATION DESCRIPTION
9-1. Outline of Air Conditioner Control • Detection of inverter input current and current
release operation
This air conditioner is a capacity-variable type air
conditioner, which uses AC or DC motor for the indoor • Over-current detection and prevention operation
for motor and the outdoor fan motor. And the capacity- to IGBT module (Compressor stop function)
proportional control compressor mounted. The DC • Compressor and outdoor fan stop function when
motor drive circuit is mounted to the indoor unit. serial signal is off (when the serial signal does not
The compressor and the inverter to control fan motor reach the board assembly of outdoor control by
are mounted to the outdoor unit. trouble of the signal system)
The entire air conditioner is mainly controlled by the • Transferring of operation information (Serial
indoor unit controller. signal) from outdoor unit controller to indoor unit
controller
The indoor unit controller drives the indoor fan motor
based upon command sent from the remote controller, • Detection of outdoor temperature and operation
and transfers the operation command to the outdoor revolution control
unit controller. • Defrost control in heating operation (Temp.
The outdoor unit controller receives operation com- measurement by outdoor heat exchanger and
mand from the indoor unit side, and controls the control for 4-way valve and outdoor fan)
outdoor fan and the pulse motor valve. (P.M.V) 3. Contents of operation command signal
Besides, detecting revolution position of the compres-
sor motor, the outdoor unit controller controls speed of
(Serial signal) from indoor unit controller to
the compressor motor by controlling output voltage of outdoor unit controller
the inverter and switching timing of the supply power The following three types of signals are sent from
(current transfer timing) so that motors drive according the indoor unit controller.
to the operation command. • Operation mode set on the remote controller
And then, the outdoor unit controller transfers reversely • Compressor revolution command signal defined
the operating status information of the outdoor unit to by indoor temperature and set temperature
control the indoor unit controller. (Correction along with variation of room tempera-
As the compressor adopts four-pole brushless ture and correction of indoor heat exchanger
DC motor, the frequency of the supply power temperature are added.)
from inverter to compressor is two-times cycles • Temperature of indoor heat exchanger
of the actual number of revolution. • For these signals ([Operation mode] and [Com-
pressor revolution] indoor heat exchanger tem-
1. Role of indoor unit controller perature), the outdoor unit controller monitors the
The indoor unit controller judges the operation input current to the inverter, and performs the
commands from the remote controller and assumes followed operation within the range that current
the following functions. does not exceed the allowable value.
• Judgment of suction air temperature of the indoor 4. Contents of operation command signal
heat exchanger by using the indoor temp. sensor. (Serial signal) from outdoor unit controller
(TA sensor) to indoor unit controller
• Judgment of the indoor heat exchanger tempera-
The following signals are sent from the outdoor unit
ture by using heat exchanger sensor (TC sensor)
controller.
(Prevent-freezing control, etc.)
• The current operation mode
• Louver motor control
• The current compressor revolution
• Indoor fan motor operation control
• Outdoor temperature
• LED (Light Emitting Diode) display control
• Existence of protective circuit operation
• Transferring of operation command signal (Serial
signal) to the outdoor unit For transferring of these signals, the indoor unit
controller monitors the contents of signals, and
• Reception of information of operation status
judges existence of trouble occurrence.
(Serial signal including outside temp. data) to the
outdoor unit and judgment/display of error Contents of judgment are described below.
• Whether distinction of the current operation
2. Role of outdoor unit controller status meets to the operation command signal
• Whether protective circuit operates
Receiving the operation command signal (Serial
signal) from the indoor unit controller, the outdoor When no signal is received from the outdoor
unit performs its role. unit controller, it is assumed as a trouble.


• Compressor operation control
• Operation control of outdoor fan motor Operations followed to judgment
• P.M.V. control  of serial signal from indoor side.
• 4-way valve control (Heat Pump model only) 

− 23 −
9-2. Operation Description

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

1. Operation control ................................................................................................... 25
2. Operating mode selection when performing 2-room operation ......................... 26
3. Cooling/Heating operation ..................................................................................... 26
4. AUTO operation .................................................................................................... 27
5. DRY operation ....................................................................................................... 27
2. Indoor fan motor control ............................................................................................. 28
3. Capacity control .......................................................................................................... 30
4. Release protective control by temperature of indoor heat exchanger ........................ 31
5. Louver control ............................................................................................................. 32
1) Louver position ....................................................................................................... 32
2) Air direction adjustment ......................................................................................... 32
3) Swing ..................................................................................................................... 32
6. ECO operation ............................................................................................................ 33
7. Temporary operation ................................................................................................... 34
8. Self-Cleaning function ................................................................................................ 35
9. Selt-Cleaning function release ................................................................................... 36
10. Remote-A or B selection ............................................................................................ 37
11. QUIET mode ............................................................................................................. 38
12. COMFORT SLEEP mode ............ ............................................................................. 38
13. Short Timer ................................................................................................................ 38
14. One-Touch Comfort .................................................................................................. 39
15. Hi-POWER Mode ...................................................................................................... 39
16. FILTER Indicator ............................................................................................... 39
................................................................................................ 40
9-3. Auto Restart Function
9-3-1. How to Set the Auto Restart Function .............................. ........................................ 40
9-3-2. How to Cancel the Auto Restart Function ................................................................ 41
9-3-3. Power Failure During Timer Operation ................................................................... 41

9-4. Remote Controller and Its Fuctions .................................................................... 42

9-4-1. Parts Name of Remote Controller ............................................................................. 42
9-4-2. Operation of remote control ...................................................................................... 42
9-4-3. Name and Functions of Indications on Remote Controller ....................................... 45

– 24 −
 Item Operation flow and applicable data, etc. Description

1. Basic 1. Operation control

operation
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 compres-
sor, outdoor fan motor, 4-way valve and pulse motor valve.

Remote controller

Selection of Control contents of remote controller

operation conditions • ON/OFF
• Operation select
ON/OFF • 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

Indoor unit

Signal receiving Indoor unit control

• Command signal generating function of
Indoor unit control indoor unit operation
• Calculation function (temperature calculation) • Indoor fan motor
• Activation compensation function of indoor fan • Louver motor
Operation command • Cold draft preventive function
• Timer function
Serial signal send/receive • Indoor heat exchanger release control

Outdoor unit
~
Serial signal send/receive Outdoor unit control Inverter
• Frequency control of inverter output
Outdoor unit control • Waveform composite function
• Calculation function • Compressor
(Temperature calculation) • Outdoor fan motor
• AD conversion function • 4-way valve
• Quick heating function • Pulse motor valve
• Delay function of compressor reactivation (P.M.V.)
• Current release function
• GTr over-current preventive function
• Defrost operation function

– 25 –
 Item Operation flow and applicable data, etc. Description

1. Basic 2. Operating mode selection when performing 2-room operation

operation 1) The outdoor unit operation 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 instructions 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. Indoor unit Set operating mode Actual indoor unit operation Actual outdoor unit operation
Pressed first Cooling (dry) Cooling (dry)
1 Cooling
Pressed last Cooling (dry) Cooling (dry)
Pressed first Heating Heating
2 Heating
Pressed last Heating Heating
Pressed first Fan only Fan only
3 Stopped
Pressed last Fan only Fan only
Pressed first Fan only Fan only
4 Cooling
Pressed last Cooling (dry) Cooling (dry)
Pressed first Cooling (dry) Cooling (dry)
5 Cooling
Pressed last Fan only Fan only
Pressed first Cooling (dry) Cooling (dry)
6 Cooling
Pressed last Heating Fan stopped
Pressed first Heating Heating
7 Heating
Pressed last Cooling (dry) Fan stopped
Pressed first Cleaning operation Cleaning operation
8 Stopped
Pressed last Cleaning operation Cleaning operation
Pressed first Cleaning operation Cleaning operation
9 Cooling
Pressed last Cooling (dry) Cooling (dry)
Pressed first Cooling (dry) Cooling (dry)
10 Cooling
Pressed last Cleaning operation Cleaning operation
Pressed first Cleaning operation Cleaning operation
11 Stopped
Pressed last Fan only Fan only
Pressed first Fan only Fan only
12 Stopped
Pressed last Cleaning operation Cleaning operation
Pressed first Cleaning operation Cleaning operation
13 Stopped
Pressed last Heating Fan stopped
Pressed first Heating Heating
14 Heating
Pressed last Cleaning operation Fan stopped

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 contr " land 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 Setup of remote controller

Indoor unit control 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

– 26 –
 Item Operation flow and applicable data, etc. Description

1. Basic 4. AUTO operation 1) Detects the room temperature (Ta) when

operation Selection of operation mode the operation started.
As shown in the following figure, the operation starts by 2) Selects an operation mode from Ta in
selecting automatically the status of room temperature the left figure.
(Ta) when starting AUTO operation. 3) Fan operation continues until an
*1. When reselecting the operation mode, the fan operation mode is selected.
speed is controlled by the previous operation mode. 4) When AUTO operation has started
within 2 hours after heating operation
stopped and if the room temperature is
Ta 20°C or more, the fan operation is
Cooling operation performed with ”Super Ultra LOW” mode
Ts + 1 for 3 minutes.
Then, select an operation mode.
Monitoring (Fan) 5) If the status of compressor-OFF
Ts – 1 continues for 15 minutes the room
Heating operation (Heatpump) temperature after selecting an operation
Monitoring (Fan)(Cooling Only) mode (COOL/HEAT), reselect an
operation mode.

5. DRY operation 1) Detects the room temperature (Ta) when

DRY operation is performed according to the difference the DRY operation started.
between room temperature and the setup temperature 2) Starts operation under conditions in the
as shown below. left figure according to the temperature
In DRY operation, fan speed is controlled in order to difference between the room tempera-
prevent lowering of the room temperature and to avoid ture and the setup temperature (Tsc).
air flow from blowing directly to persons. Setup temperature (Tsc)
= Set temperature on remote controller
(Ts) + (0.0 to 1.0)
[˚C]
3) When the room temperature is lower
Ta L– (W5) 1°C or less than the setup temperature,
turn off the compressor.
+1.0 (W5+W3) / 2
+0.5
SUL (W3)
Tsc
Fan speed

− 27 −
 Revised-2

Item Operation flow and applicable data, etc. Description

2. Indoor fan <In cooling operation>

motor control (This operation controls the fan speed at indoor unit side.) * Symbols
The indoor fan (cross flow fan) is operated by the phase- UH : Ultra High
control induction motor. The fan rotates in 5 stages in H : High
MANUAL mode, and in 5 stages in AUTO mode, respec- M+ : Medium+
tively. (Table 1) M : Medium
L+ : Low+
L : Low
L- : Low–
COOL ON
UL : Ultra Low
SUL : Super Ultra Low

Fan speed setup MANUAL * The fan speed broadly varies due
(Fig. 1) to position of the louver, etc.
The described value indicates one
AUTO Indication Fan speed under condition of inclining
downward blowing.
L W6
1) When setting the fan speed to L,
L+ (L + M) / 2 L+, M, M+ or H on the remote
M W9 controller, the operation is
performed with the constant
M+ (M + H) / 2 speed shown in Fig. 1.
H WC 2) When setting the fan speed to
AUTO on the remote controller,
(Fig. 2) revolution of the fan motor is
controlled to the fan speed level
shown in Fig. 2 and Table 1
Air volume AUTO according to the setup tempera-
Ta ture, room temperature, and heat
[˚C]
exchanger temperature.
M+(WB)
+2.5
+2.0 a *3 *3 : Fan speed = (M + –L) x 3/4 + L

+1.5 b *4 *4 : Fan speed = (M + –L) x 2/4 + L

+1.0 c *5 *5 : Fan speed = (M + –L) x 1/4 + L

+0.5 d (Linear approximation

L(W6)
from M+ and L)
Tsc e

(Table 1) Indoor fan air flow rate

Fan speed RAS-M10SKV-E RAS-M13SKV-E RAS-M16SKV-E
RAS-M07SKV-E
level RAS-M10SKCV-E RAS-M13SKCV-E RAS-M16SKCV-E
COOL HEAT DRY
Fan speed Air flow rate Fan speed Air flow rate Fan speed Air flow rate Fan speed Air flow rate
(rpm) (m3/h) (rpm) (m3/h) (rpm) (m3/h) (rpm) (m3/h)
WF UH 1240 630 1240 630 1240 630 1470 743
WE H 1170 582 1170 582 1240 630 1470 743
WD UH M+ UH 1140 563 1140 563 1190 596 1440 723
WC H H 1100 536 1100 536 1140 563 1390 691
WB M+ M+ M+ 1000 469 1000 469 1040 496 1250 601
WA M 1000 469 1000 469 100 469 1190 563
W9 M L+ 960 443 960 443 960 443 1120 518
W8 L 870 383 870 383 870 383 970 421
W7 L+ L- L+ 850 369 850 369 850 369 950 408
W6 L L 760 309 760 309 760 309 890 370
W5 L- UL L- 760 309 760 309 760 309 870 357
W4 UL UL 700 269 700 269 700 269 810 318
W3 SUL SUL 650 236 650 236 650 236 750 280
W2 SUL 500 135 500 135 500 135 600 183
W1 500 135 500 135 500 135 500 119

– 28 –
 Item Operation flow and applicable data, etc. Description

2. Indoor fan <In heating operation> 1) When setting the fan speed to L,
motor control L+, M, M+ or H on the remote
controller, the operation is per-
formed with the constant speed
HEAT ON shown in Fig. 3 and Table 1.
2) When setting the fan speed to
AUTO on the remote controller,
Fan speed setup MANUAL revolution of the fan motor is
(Fig. 3) controlled to the fan speed level
shown in Fig. 5 according to the set
Indication Fan speed temperature and room temperature.
L W8 3) Min air flow rate is controlled by
temperature of the indoor heat
L+ (L + M) / 2 exchanger (Tc) as shown in Fig. 4.
AUTO
M WA 4) Cold draft prevention, the fan
M+ (M + H) / 2 speed is controlled by temperature
H WE of the indoor heat exchanger (Tc)
as shown in Fig. 6.
YES 5) In order to prevent Cold draft when
TC ≥ 42˚C Min air flow rate control compressor step during heating
operation. Then louver will move to
NO upper position and fan speed will
reduce or off.
Tc Limited to Min WD tap
52
51

42
41
*
No limit
* Fan speed =
(Fig. 4) (TC – – W8) + W8
Cold draft preventive control

Basic fan control Fan speed

TA [˚C] AUTO
Tc
b 46 46 34 H (WE)
TSC
L+ (W9) 45 45 33
c Line-approximate
–0.5
H and SUL with Tc.
d *1 33 33 21
–1.0 32 32 20
e *2
–1.5 *A+4 *A+4 *A+4
f SUL (W2)
–2.0 *3 *A-4 *A-4 *A-4
Stop
g
–2.5

–5.0 M+ (WD) Fan speed MANUAL in starting

Fan speed AUTO in stability
–5.5 Fan speed AUTO in starting
H (WE)

*1: Fan speed = (M + -L+) x 1 4 + L+

*2: Fan speed = (M + -L+) x 2 4 + L+ * No limitation while fan speed MANUAL mode is in stability.
* A: When Tsc ≥ 24, A is 24, and when Tsc < 24, A is Tsc
*3: Fan speed = (M + -L+) x 3 4 + L+ Tsc: Set value
(Calculated with linear approximation from M+ and L+)
(Fig. 5) (Fig. 6)

[In starting and in stability]

In starting In stability
• Until 12 minutes passed after operation start • When 12 to 25 minutes passed after operation start
FAN AUTO • When 12 to 25 minutes passed after operation and room temp. is higher than (set temp. –3°C)
start and room temp. is 3°C or lower than set temp. • When 25 minutes or more passed after operation start
FAN Manual • Room temp. < Set temp. –4°C • Room temp. ≥ Set temp. –3.5°C

– 29 –
 Item Operation flow and applicable data, etc. Description

3. Capacity The cooling or heating capacity depending on the load is 1) The difference between set
control adjusted. temperature on remote controller
According to difference between the setup value of tempera- (Ts) and room temperature (Ta)
ture and the room temperature, the capacity is adjusted by is calculated.
the compressor revolution. 2) According to the temperature
difference, the correction value of
Remote controller Indoor unit Hz signal which determines the
compressor speed is set up.
Set temp. (Ts) Room temp. (Ta)
3) The rotating position and speed
of the motor are detected by the
electromotive force occurred on
Ts –Ta the motor winding with operation
of the compressor.
4) According to the difference
Correction of Hz signal
resulted from comparison of the
correction value of Hz signal with
Detection of electromotive force the present operation Hz, the
of compressor motor winding inverter output and the commuta-
tion timing are varied.
5) Change the compressor motor
Detection of motor speed and rotor position speed by outputting power to the
compressor.
Correction value of Hz signal ≤ Operating Hz * The contents of control
operation are same in cooling
operation and heating
Inverter output change operation
Commutation timing change

Change of compressor speed

Current About "Current release control", Please refer to a service manual of connected Multi outdoor unit.
release control

– 30 –
 Item Operation flow and applicable data, etc. Description

4. Release protective <In cooling/dry operation> 1) When temperature of the indoor

control by tempera- (Prevent-freezing control for indoor heat exchanger) heat exchanger drops below 5°C,
ture of indoor heat the compressor speed is
In cooling/dry operation, the sensor of indoor heat
exchanger reduced. (P zone)
exchanger detects evaporation temperature and
controls the compressor speed so that temperature of 2) When temperature of the indoor
the heat exchanger does not exceed the specified heat exchanger rises in the
value. range from 6°C to under 7°C, the
compressor speed is kept.
(Q zone)
Indoor heat exchanger temperature

Usual cooling capacity control 3) When temperature of the indoor

heat exchanger rises to 7°C or
R higher, the capacity control
operation returns to the usual
7˚C When the value is
in Q zone, the control in cooling operation.
Q compressor speed (R zone)
6˚C is kept.
P
5˚C

Reduction of compressor speed

<In heating operation> 1) When temperature of the indoor

(Prevent-overpressure control for refrigerating cycle) heat exchanger rises in the
range from 50°C to 55°C, the
In heating operation, the sensor of indoor heat ex-
compressor speed is kept.
changer detects condensation temperature and controls
(Q zone)
the compressor speed so that temperature of the heat
exchanger does not exceed the specified value. When temperature of the indoor
heat exchanger drops in the
range from 46°C to under 55°C,
the compressor speed is kept.
(Q zone)
Indoor heat exchanger temperature

Reduction of compressor speed

P 2) When temperature of the indoor
55˚C heat exchanger rises to 55°C or
higher, the compressor speed is
reduced. (P zone)
52˚C When the value is
Q in Q zone, the 3) When temperature of the indoor
compressor speed heat exchanger does not rise to
is kept. 50°C, or when it drops below to
48˚C 46°C, the capacity control
operation returns to the usual
R control in heating operation.
Usual heating capacity control (R zone)

– 31 –
 Item Operation flow and applicable data, etc. Description

5. Louver control This function controls the air direction of the indoor unit.
1) Louver • The position is automatically controlled according to the operation
position mode (COOL/HEAT).
• The set louver position is stored in memory by the microcomputer,
and the louver returns to the stored position when the next operation
is performed. (Cooling/Heating memory position)
The angle of the louver is indicated as the louver closes fully is 0°.

1) Louver position in cooling operation

Initial setting of "Cooling storage position"

Louver : Directs downward (35.3°)

2) Louver position in heating operation

Heating operation/
AUTO (HEAT)

Initial setting of “Heating storage position”

Louver : Directs downward (80.5˚)

2) Air direction adjustment • The louver position can

be arbitrarily set up by
Air direction pressing [FIX] button.

Horizontal Inclined Blowing Inclined Horizontal

blowing blowing downward blowing blowing

3) Swing • Swing operation is performed in width 35° with the stop position as • Swing
the center. When pressing
• If the stop position exceeds either upper or lower limit position, [SWING] button during
swing operation is performed in width 35° from the limit which the operation, the louver
stop position exceeded. starts swinging.

– 32 –
 Revised-2

Item Operation flow and applicable data, etc. Description

6. ECO When pressing [ECO] button on the remote controller, a <Cooling operation>
operation Economic operation is performed.
1) The control target temperature
<Cooling operation> increase 0.5ºC per hour up to 2ºC
This function operates the air conditioner with the difference starting from the set temperature
between the set and the room temperature as shown in the when ECONO has been received.
following figure.
2) The indoor fan speed is depend
on presetting and can change
Zone Frequency every speed after setting ECO
TA
12 Dry Max
FAN operation.
+6.5
11 *12
+6.0 3) The compressor speed is

Fan speed depend on presetting and can change every speed.

10 *11
+5.5
9 *10 controlled as shown in the left
+5.0
8 *9 figure.
+4.5
+4.0 7 *8
6
+3.5
5
+3.0
4
+2.5
3
+2.0
2
+1.5
+1.0 Min
1 Hz
+0.5
TSC
-0.5
-1.0

-2.0
OFF

1H 2H 3H 4H Time

* 12 (DRY max - COOL min) /6 x 5 + COOL min

* 11 (DRY max - COOL min) /6 x 4 + COOL min
* 10 (DRY max - COOL min) /6 x 3 + COOL min
* 9 (DRY max - COOL min) /6 x 2 + COOL min
* 8 (DRY max - COOL min) /6 x 1 + COOL min
M10SKCV-E M16SKV-E
Hz M07SKV-E M13SKV-E M13SKCV-E
M10SKV-E M16SKCV-E
Cool min 20 20 20 13 13
DRY max 35 35 37 31 35

<Heating operation>
<Heating operation>
30 minutes → Time Compressor 1) Setting the compressor speed to
speed Max. aHz, the temperature zone
0Hz
0 in which the operation can be
A
–0.5 performed with Max. cHz is
–1.0 gradually widened after 30
–1.5 B minutes passed when starting
(Room temp. – Set temp.)

A A zone
–2.0 ECO operation.
–2.5 aHz
–3.0 2) The indoor fan speed is depend
–4.0 on presetting and can change
–5.0 every speed after setting ECO
–6.0 operation.
–7.0
–8.0 C B B zone
–9.0 a to cHz
–10.0
–11.0
C zone
C
cHz

M10SKCV-E M16SKV-E
Hz M07SKV-E M13SKCV-E
M13SKV-E M16SKCV-E
a 20 20 13 13
b 50 50 43 50

– 33 –
 Item Operation flow and applicable data, etc. Description

7. Temporary Pressing [RESET] button starts the temporary opera- 1) When pressing [RESET] button, the
operation tion of [AUTO] operation. When keeping [RESET] temporary [AUTO] operation starts.
button pressed for 10 seconds or more, the temporary 2) When keeping [RESET] button pressed
[COOL] operation is performed. for 3 seconds or more, Pi, Pi, Pi sound is
heard and [AUTO RESTART] control is
changed.
YES 3) When keeping [RESET] button pressed
Filter lamp ON Press RESET button.
for 10 seconds or more, “Pi” sound is
NO heard and the temporary [COOL]
Did you press [RESET] button NO operation starts.
Temporary [AUTO] operation
for 3 seconds or more? 4) If the filter lamp goes on, press [RESET]
YES button to go off the filter lamp, and then
press [RESET] button again.
Did you press [RESET] button YES
5) To stop the temporary operation, press
for 10 seconds or more?
the button again.
NO
Switch to [AUTO RESTART] control. Temporary [COOL] Operation

– 34 –
 Item Operation flow and applicable data, etc. Description

8. Self-Cleaning 1. Purpose
function The Self-Cleaning operation is to minimize the
growth of mold, bacteria etc. by running
the fan and drying so as to keep the
inside of the air conditioner clean.
Unit now performing cooling or dry operation
Self-Cleaning operation
When the cooling or dry operation shuts
down, the unit automatically starts the Self-
Press “STOP” button Cleaning operation which is then performed
for the specified period based on duration
of the operation which was performed
prior to the shutdown, after which the
Only timer indicator lights, and Self Cleaning operation starts Self-Cleaning operation stops.
(The Self-Cleaning operation is not
performed after a heating operation.)
2. Operation
Time set now elapses 1) When the stop signal from the remote
controller or timer-off function is received,
only the timer indicator light.
2) The period of the Self-Cleaning operation
Operation stops is determined by the duration of the
operation performed prior to the
reception of the stop code.
3) After the Self-Cleaning operation has
been performed for the specified period,
the unit stops operating.

• During Self-Cleaning operations: The louver opens

slightly. The indoor fan operates continuously at
a speed of 500 rpm.

Self-Cleaning operation times

Operation time Self-Cleaning operation time

No Self-Cleaning operation
Up to 10 minutes performed (0 minutes)
Cooling: Auto (cooling) Dry 10 minutes
or longer 30 mins.

Heating: Auto (heating)

Auto (fan only) No Self-Cleaning operation performed
Shutdown

• To stop an ongoing Self-Cleaning operation at any time

Press the start/stop button on the remote controller twice during the Self-Cleaning
operation. (After pressing the button for the first time, press it for the
second time without delay (within 10 minutes).)

– 35 –
 Item Operation flow and applicable data, etc. Description

8. Self-Cleaning • Self-Cleaning diagram

function

Operation display ON OFF OFF

ON ON
FCU fan OFF
rpm is depend on presetting. (500RPM)

FCU louver OPEN OPEN (12.7º) CLOSE

ON or OFF ON or OFF
Timer display ON
depend on presetting of timer function. depend on presetting of timer function.

ON or OFF
Compressor OFF OFF
depend on presetting per room temperature.

CDU fan ON or OFF

OFF OFF
depend on presetting per room temperature.

Operation time
Cool mode or dry mode Self-Cleaning mode
operation more than 10 mins. operate 30 mins.
Automatically turn-off.
Turn off by remote controller or
timer-off function.

9. Self-Cleaning How to cencel Self-Cleaning function

function release To cancel the Self-Cleaning function, proceed as
follows:
• Press [RESET] button one time or use remote
control to turn on air conditioner. Display will show
in green color.
• Hold down the [RESET] button for more than
20 seconds. (The air conditioner will stop suddenly
when the [RESET] is pressed but keep holding it
continue. The will beep 3 times in the first
3 seconds but it is not related to Self-Cleaning
function)
• After holding about 20 seconds, the air conditioner
will beep 5 times without any blinking of display.
• The Self-Cleaning Operation had been cancelled.
Remark
Presetting of Self-Cleaning function above, AUTO-
RESTART function had been cancelled. To set
AUTO-RESTART again, please follow item 9-3-1
How to set Self-Cleaning function
Hi POWER FILTER PAP TIMER OPERATION

To set the Self-Cleaning function, proceed as follows.

• Press [RESET] button one time or use remote RESET

control to turn on air conditioner. Display will show

in green color.
• Hold down the [RESET] button for more than
20 seconds. (The air conditioner will stop suddenly
when the [RESET] is pressed but keep holding it
continue. Then will beep 3 times is the first 3
seconds but it is not related to Self-Cleaning
function)
• After holding about 20 seconds, the air conditioner
will beep 5 times and OPERATION display blinks
5 times.
• The Self-Cleaning function had been set.
Remark
Presetting of Self-Cleaning function above, AUTO-
RESTART function had been cancelled. To set
AUTO-RESTART again, please follow item 9-3-1

− 36 −
 Item Operation flow and applicable data, etc. Description

10. Remote-A or B Setting the remote controller 1. Purpose

selection To separate using of remote control for each indoor This operation is to operate only one
unit in case of 2 air conditioner are installed nearly. indoor unit using one remote controller.
Remote Control B Setup. 2. Description
1) Press RESET button on the indoor unit to turn
When operating one indoor unit in a
the air conditioner ON. situation where two indoor units have
2) Point the remote control at the indoor unit. been installed in the same room or
3) Push and hold CHK • button on the Remote nearby rooms, this operation prevents the
Control by the tip of the pencil. "00" will be shown remote controller signal from being
shown on the display. received simultaneously by both units,
4) Press MODE • during pushing CHK • . "B" will thus preventing both units from operating.
show on the display and "00" will disappear and 3. Operation
the air conditioner will turn OFF. The Remote The indoor unit on which the remote
Control B is memorized. controller selection has been set to B
receives the signal of the remote control-
Note : 1. Repeat above step to reset Remote Control ler also set to B.
to be A. (At the factory the remote controller
2. Remote Control A has not "A" display. selection is set to A on all the indoor
3. Default setting of Remote Control from units. There is no A setting display.)
factory is A.

− 37 −
 Item Operation flow and applicable data, etc. Description

11. QUIET mode When the [QUIET] button is pressed, the fan of the Quiet mode is the system which, control the
indoor unit will be restricted the revolving speed at revolving speed of indoor fan to work
speed L − until the [QUIET] button is pressed once constantly at lower than speed L. In addition,
again (cancel Quiet mode). noise level of indoor unit is less than usual.
Remarks :
1. Quiet mode is unable to work in dry mode.
2. Quiet mode is appropriate to work with less
cooling load and less heating load condition.
Because of the fan speed L- may cause not
enough the cooling capacity or heating
capacity.

12. COMFORT Cooling mode The principles of comfort sleep mode are:
SLEEP • The preset temperature will increase as • Quietness for more comfortable. When
show on ECO operation (Item No. 9) room temperature reach setting temperature
• Save energy by changing room temperature
• Press the [COMFORT SLEEP] button to
automatically.
choose the operating hours. Repeat
• The air condition can shut down by itself
pressing to select the hours.
automatically.
(1hr, 3hr, 5hr or 9hr)
Remarks:
• If the [COMFORT SLEEP] button is pressed
again means cancel comfort sleep mode. 1. Comfort sleep mode will not operate in dry
mode and fan only mode.
Heating mode
• The preset temperature will drop down as
show on ECO operation (Item No. 9)
• Press the [COMFORT SLEEP] button to
choose the operating hours. Repeat
pressing to setect thehours.
(1hr, 3hr, 5hr or 9 hr)
• If the [COMFORT SLEEP] button is pressed
again means cancel comfort sleep mode.

13. Short Timer In the normal condition, after switching one circuit Purpose
breaker, 3-minute delay time for compressor and To start the unit immediately for the purpose of
1 hour for plasma air purifier are set for the testing, trial...etc, short timer can be used.
maintenance of the unit. maintenance of the unit.
Short Timer Setting
j Press [ ] button to turn the unit OFF.
k Set the operation mode or plasma air
purifier on the remote control without
sending the signal to the unit.
l Use the tip of the pencil to push the
[CHK] button and hold, "00" will show
on display, them press [SET] button
to make "00" disappear.
m Press [ ] button to turn the unit ON.
n When short timer is activated, all
setting on the remote operates
immediately, besides, all indicatiors on
front panel turns ON continuously for
3 seconds.

− 38 −
 Item Operation flow and applicable data, etc. Description

14. One-Touch One touch comfort is the fully automated operation Operation condition for model to Europe
Comfort that is set according to the preferable condition in market
a region.
When an indoor unit receives "One Touch
Comfort Signal" from the remote controller,
the indoor unit operates as following.
Fan 1) Air conditioner starts to operation when
Operation
AUTO
the signal is received, even if the air
* AUTO/L L
conditioner was OFF.
2) Operation mode is set according to room
temperature, the same as AUTO mode.
3) Target temperature is 24ºC.
Time after operation
0 12 25 starts (min) 4) Louver position is set as stored position
of the operating mode.
*AUTO/L: Fan operates depends on the setting
temperature and room temperature. 5) Fan is controlled as followings.

During the One Touch Comfort mode if the indoor

unit receives any signal with other operation mode,
the unit will cancel the comfort mode and operates
according to the signal received.

15. Hi-POWER ([Hi-POWER] button on the remote controller

Mode is pressed)
When [Hi-POWER] button is pressed while the indoor
unit is in Auto, Cooling or Heating operation, Hi-
POWER mark is indicated on the display of the remote
controller and the unit operates as follows.
1. Automatic operation
• The indoor unit operates in according to the
current operation.
2. Cooling operation
• The preset temperature drops 1ºC
(The value of the preset temperature on the
remote controller does not change.)
The indoor unit's fan speed level increase 1 tap
3. Heating operation
• The preset temperature increases 2ºC
(The value of the preset temperature on the
remote controller does not change.)
The indoor unit's fan speed level increase 1 tap .
4. The Hi-POWER mode can not be set in Dry
operation

16. FILTER When the elapsed time reaches 1000 hours after air
Indicator purifier operation, the FILTER indicator lights.
After cleaning the filters, turn off the FILTER indicator.
How to Turn Off FILTER Indicator
Press [RESET] button on the indoor unit.
NOTE :
If [RESET] button is pushed while the FILTER indicator
is not lit, the indoor unit will start the automatic
operation.
When you want a temporary operation while the
FILTER lamp lights, press [RESET] button to turn off
the FILTER lamp. (See page 34)

− 39 −
9-3. Auto Restart Function
This indoor unit is equipped with an automatic restarting function which allows the unit to restart operating with
the set operating conditions in the event of a power supply being accidentally shut down.
The operation will resume without warning three minutes after power is restored.
This function is not set to work when shipped from the factory. Therefore it is necessary to set it to work.

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

To set the auto restart function, proceed as follows:
The power supply to the unit must be on ; the function will not set if the power is off.
Press the [RESET] button located in the center of the front panel continuously for three seconds.
The unit receives the signal and beeps three times.
The unit then restarts operating automatically in the event of power supply being accidentally shut down.

• When the unit is standby (Not operating)

Operation Motions

Press [RESET] button for more than The unit is on standby.

three seconds. (Less than 10 seconds)
↓
The unit starts to operate. The green indicator is on.
↓ After approx. three seconds,
The unit beeps three times The green indicator flashes
and continues to operate. for 5 seconds.
Hi POWER FILTER PAP TIMER OPERATION

If the unit is not required to operate at this time, press [RESET]

RESET
button once more or use the remote controller to turn it off.

• When the unit is in operation

Operation Motions

Press [RESET] button for more than The unit is in operation. The green indicator is on.
three seconds. (Less than 10 seconds)
↓
The unit stops operating. The green indicator is turned off.
↓ After approx. three seconds,
The unit beeps three times. The green indicator flashes
for 5 seconds.
Hi POWER FILTER PAP TIMER OPERATION

If the unit is required to operate at this time, press [RESET] button

RESET
once more or use the remote controller to turn it on.

• While the filter check indicator is on, the RESET button has the function of filter reset betton.

– 40 –
9-3-2. How to Cancel the Auto Restart Function
To cancel auto restart function, proceed as follows :
Repeat the setting procedure : the unit receives the signal and beeps three times.
The unit will be required to be turned on with the remote controller after the main power supply is turned off.

• When the system is on stand-by (not operating)

Operation Motions

Press [RESET] button for more than The unit is on standby.

three seconds. (Less than 10 seconds)
↓
The unit starts to operate. The green indicator is on.
↓ After approx. three seconds,
The unit beeps three times and continues to operate.
Hi POWER FILTER PAP TIMER OPERATION
If the unit is not required to operate at this time, press [RESET]
button once more or use the remote controller to turn it off.
RESET

• When the system is operating

Operation Motions

Press [RESET] button for more than The unit is in operation. The green indicator is on.
three seconds. (Less than 10 seconds)
↓
The unit stops operating. The green indicator is turned off.
↓ After approx. three seconds,
The unit beeps three times.

Hi POWER FILTER PAP TIMER OPERATION

If the unit is required to operate at this time, press [RESET] button
once more or use the remote controller to turn it on.
RESET

9-3-3. Power Failure During Timer Operation

When the unit is turned off because of power failure
during timer operation, the timer operation is can-
celled. In that case, set the timer operation again.
NOTE :
The Everyday Timer is reset while a command signal
can be received from the remote controller even if it
stopped due to a power failure.

– 41 –
9-4. Remote control
9-4-1. Remote control and its functions
1 Infrared signal emitter 1
2 Start/Stop button
3 Mode select button (MODE)
4 Temperature button (TEMP)
5 Fan speed button (FAN
6 Swing louver button (SWING)
7 Set louver button (FIX) PRESET FAN

13 5
8 On timer button (ON) TEMP

4
9 Off timer button (OFF) ONE-TOUCH MODE

14 3
18
10 Sleep timer button (SLEEP)
2 18
19
11 Setup button (SET) QUIET
COMFORT
SLEEP

12
20 Clear button (CLR) 17
15
SWING FIX Hi-POWER ECO
13 Memory and Preset button (PRESET) 6 16
14 One Touch button (ONE-TOUCH) 7 12
TIMER CLR

15 High power button (Hi-POWER) 8 ON OFF 9

16 Economy button (ECO) 10 SLEEP SET
11
21
17
CHK FILTER CLOCK
Quiet button (QUIET) 20
18 Comfort sleep button (COMFORT SLEEP) 19

19 Filter reset button (FILTER)

20 Clock Reset button (CLOCK)
21 Check button (CHK)

9-4-2. Operation of remote control

1. ONE-TOUCH
Press the "ONE-TOUCH" button for fully automated operation that is customised to the typical consumer
preferences in your region of the world. The coutomised settings control temperature air flow strength, air flow
direction and other settings to provide you alternate contact with "ONE-TOUCH" OF THE BUTTON. If you
prefer other settings you can select from the many other operation functions of your Toshiba unit
Press ONE-TOUCH : Start the operaton.

2. AUTOMATIC OPERATION
To automatically select cooling, heating, or fan only operation.
1. Press MODE : Select A.
2. Press MODE : Select A.

3. COOLING / HEATING / FAN ONLY OPERATION

To automatically select cooling, heating, or fan only operation.
1. Press MODE : Select Cool , Heat , or Fan only .
2. Press MODE : Set the desired temperature.
Cooling: Min. 17°C, Heating : Max, 30°C, Fan Only: No temperature indication
3. Press FAN : Select AUTO, LOW , LOW+ , MED , MED+ , or
HIGH .

− 42 −
4. DRY OPERATION (COOLING ONLY)
For dehumidification, a moderate cooling performance is controlled automatically.
1. Press MODE : Select Dry .
2. Press MODE : Set the desired temperature.

5. Hi-POWER OPERATION
To automatically control room temperature and airflow for faster cooling or heating
operation (except in DRY and FAN ONLY mode)
Press HI-POWER : Start and stop the operation.

6. ECO OPERATION
To automatically control room to save energy (except in DRY and FAN ONLY mode)
Press ECO : Start and stop the operation.
Note: Cooling operation; the set temperature will increase automatically 1 degree/
hour for 2 hours (maximum 2 degrees increase). For heating operation the
set temperature will decrease.

7. TEMPORARY OPERATION
In case of the misplaced or discharged remote control
• Pressing the RESET button, the unit can start or stop
without using the remote control.
• Operation mode is set on AUTOMATIC
operation, preset temperature is 24°C
and fan operation is automatic speed.
8. TIMER OPERATION

Setting the ON Timer Setting the OFF Timer

1 Press
ON
: Set the desired ON timer. Press
OFF
: Set the desired OFF timer.

2 Press SET
: Set the timer. Press SET
: Set the timer.

3 Press CLR
: Cancel the timer. Press CLR

Everyday timer allows the user to set both the ON & OFF timers and will be activated on a daily basis.
Setting Everyday Timer

SET
1 Press
ON
: Set the ON timer. 3 Press .

SET

4 Press button during the ( or )

2 Press
OFF
: Set the OFF timer.
mark flashing.

· During the every day timer is activation, both arrows ( or ) are indicated.

Note:
· Keep the remote control in accessible transmission to the indoor unit;
otherwise, the time lag of up to 15 minutes will occur.
· The setting will be saved for the next same operation.

– 43 –
 9. PRESET OPERATION
Set your preferred operation for future use. The setting will be memorized by the
unit for future operation (except air flow direction).
1. Select your preferred operation.
2. Press and hold PRESET for 3 seconds to memorize the setting. The P mark
displays.
3. Press PRESET : Operate the preset operation.

10. AUTO RESTART OPERATION

To automatically restart the conditioner after the power failure (Power of the unit
must be on.)
Setting
1. Press and hold the RESET button on the indoor unit for 3 seconds to set the
operation. (3 beep sound and OPERATION lamp blink 5 time/sec for 5 secpmds)
• Do not operate ON timer and OFF timer.
2. Press and hold the RESET button on the indoor unit for 3 seconds to cancel the
operation. (3 beep sound but OPERATION lamp does not blink)

11. QUIET OPERATION

To operate at super low fan speed for quiet operation (except in DRY mode)
Press QUIET : Start and stop the operation.
Note: Under certain conditions, QUIET operation may not provide adequate
cooling or heating due to low sound features.

12. COMFORT SLEEP OPERATION

To save energy while sleeping, automatically control air flow and automatically turn OFF.
Press COMFORT SLEEP : Select 1, 3, 5 or 9 hrs for OFF timer operation.
Note: The cooling operation, the set temperature will increase automatically
1 degree/hour for 2 hours (maximum 2 degrees increase). For heating operation,
the set temperature will decrease.

13. SLEEP TIMER OPERATION

To start the sleep timer (OFF timer) operation
Press SLEEP : Select 1, 3, 5 or 9 hrs for OFF timer operation.

4 FAN speed indicator

Indicates the selected fan speed.
AUTO or five fan speed levels
(LOW , LOW+ , MED , MED+ ,
HIGH ) can be shown.
Indicates AUTO when the operating mode is
either AUTO or : Dry.

− 44 −
 9-4-3. Name and Functions of Indications on Remote Controller
[Display]
All indications, except for the clock time indicator, are displayed by pressing the button.

1 Transmission mark 5 TIMER and clock time indicator

This transmission mark indicates when the The time setting for timer operation or the clock
remote controller transmits signals to the indoor time is indicated.
unit. The current time is always indicated except
2 Mode indicator
during TIMER operation.
Indicates the current operation mode. 6 Hi-POWER indicator
(AUTO : Automatic control, A : Auto changeover Indicates when the Hi-POWER operation starts.
control, : Cool, : Dry, : Heat)
Press the Hi-POWER button to start and press it
3 Temperature indicator again to stop the operation.
Indicates the temperature setting.
(17°C to 30°C)
7 (PRESET) indicator
Flashes for 3 seconds when the PRESET button is
pressed during operation.
4 FAN speed indicator
The mark is shown when holding down the
Indicates the selected fan speed. button for more than 3 seconds while the mark is
AUTO or five fan speed levels flashing.
(LOW , LOW+ , MED , MED+ , Press another button to turn off the mark.
HIGH ) can be shown. 8 ECO indicator
Indicates AUTO when the operating mode is Indicates when the ECO is in activated.
either AUTO or : Dry.
Press the ECO button to start and press it again
to stop operation.

9 A, B change indicator remote controller

When the remote controller switching function is
9 set, “B” appears in the remote controller display.
(When the remote controller setting is “A”, there is
1 12 2 13 no indication at this position.)
10 10 Comfort sleep
Indicates when comfort sleep is activaled.
Press comfort sleep button to selectter

11 Quiet
Indicates when quiet is activated.
Press quiet button to start and press it again to stop
operation.
11 12 One-Touch
Indicates when one touch comfort is activated.
Press one-touch button to start the operation.

13 Swing
Indicates when louver is swing.
Press swing button to start the swing operation
and press it again to stop the swing operation.
8 5
6 4
3 7

– 45 –
9-5. Intermittent Operation Control for Indoor Fans of the Indoor Unit at Thermo-off
Side in Heating Operation
While heating operation is executed in two rooms, if room temperature reached the setup temperature in one
room and thermo-off occurred, the following operations start. (Refer to the figure belox.)
1. The indoor unit of the room (A room) in which thermo-off did not occur starts a continuous operation with the
setup number of revolution.
2. The indoor unit of the room (B room) in which thermo-off occurred starts intermittent operation of the indoor
fan.
The indoor fan operates with number of revolution of UL or SUL. Fan-ON time is 2 minutes and Fan-OFF
time is 2 to 4 minutes.
However if temperature of the indoor heat exchanger becomes over 55°C or more in B room, the indoor fan
stops the intermittent operation and starts continuous operation.
While heating operation is executed in two rooms, if room temperature reached the setup temperature in both
room nad thermo-off occurred, both indoor units start intermittent operation of the indoor fan.

Indoor fan: Operates with setup number of revolution

A room
Thermo-ON continues
0 rpm

B room thermo-OFF B room thermo-ON

B room thermo-ON
Operated with setup number
Thermo-OFF of revolution

Thermo-ON UL UL UL ∗1 Operated with UL or SUL

(∗1) (∗1) (∗1)
0 rpm
Fan stop Fan stop Fan stop

T on T on T on

T off T off T off

T on=2 min.
∗ In case which Tc sensor temperature exceeds 55°C T off time
in B room, the fan stops intermittent operation and To < 5°C 2 min.
starts continuous operation with UL or SUL (∗1). 5 ≤ To < 10 3 min.
10 ≤ To 4 min.

– 46 –
 Revised-2

10. INSTALLATION PROCEDURE

10-1. Installation Diagram of Indoor and Outdoor Units

65 mm or more
1 70 For the rear left and left piping
mm Hook
o rm j Installation
o re
plate
Wall

Ho o 170
k mm
or m Insert the cushion between the indoor
ore unit and wall, and tilt the indoor unit for
better operation.

Air
Fi lter
Do not allow the drain hose to get slack.
(A
tta
ch
to Cut the piping
the
fro Shield pipe hole sloped
n tp slightly.
an
el .
n )
Super Oxi
Deo filter
o Make sure to run the drain hose sloped
Super downward.
Sterilizer filter
l Batteries
q Pan head
wood screw m Remote control holder The auxiliary piping can be connected to
the left, rear left, rear right, right, bottom
right or bottom left.

Right
Rear
k Wireless remote control right
Left
Bottom Rear
right left Bottom left

Insulate the refrigerant pipes separately

with insulation, not together.

8 mm thick heat resisting

polyethylene foam

Before installing the wireless remote controller

• Loading Batteries
A
C
L

1. Remove the battery cover.

2. Insert 2 new batteries (AAA type)
following the (+) and (− ) positions. 3 Batteries

2 Wireless remote controller

– 47 –
 Revised-2

10-2. Optional Parts, Accessories and Tools

10-2-1. Optional Installation Parts

Part Code Parts name Q’ty

Refrigerant piping

Indoor unit name Liquid side (Outer diameter) Gas side (Outer diameter)
Y 1 ea.
RAS-M07SKV-E, M10SKV-E, M10SKCV-E
RAS-M13SKV-E, M13SKCV-E
6.35 mm 9.52 mm
RAS-M16SKV-E, M16SKCV-E 6.35 mm 12.7 mm

Z Shield pipe (for extension drain hose) (polyethylene foam, 6 mm thick) 1

10-2-2. Accessory and Installation Parts

Part No. Part name (Q’ty) Part No. Part name (Q’ty)


Installation plate × 1 Super Oxi Deo filter x 1
ONE -T OUC H
QUIE T
S WING
T IME R
SLEEP

PR ESET
C HK

‚ †
F IX
ON
F IL T E R

T E MP
Hi-P OWE R
OF F
C L OC K

C OMF OR T

MODE

FAN
SLEEP
ECO
CLR
SET

Wireless remote control × 1 Super Sterilizer filter x 1

<Others>
ƒ ‡ Name

Battery × 2 Mounting screw Ø4 × 25L × 6 Owner’s manual

Installation manual

„ ˆ
Important information and warning*
Remote control
holder mounting screw B/W strips*
Remote control holder × 1 Ø3.1 × 16L × 2 (Energy efficiency labels)

This model is not equipped with an extension drain hose.

– 48 –
10-2-3. Installation/Servicing Tools

Changes in the product and components

In the case of an air conditioner using R410A, in order to prevent any other refrigerant from being charged
accidentally, the service port diameter of the outdoor unit control valve (3 way valve) has been changed.
(1/2 UNF 20 threads per inch)
• In order to increase the pressure resisting strength of the refrigerant piping flare processing diameter and size
of opposite side of flare nuts has been changed. (for copper pipes with nominal dimensions 1/2 and 5/8)

New tools for R410A

New tools for R410A Applicable to R22 model Changes

As pressure is high, it is impossible to measure by means of

Gauge manifold × conventional gauge. In order to prevent any other refrigerant from
being charged, each port diameter has been changed.

In order to increase pressure resisting strength, hose materials

Charge hose × and port size have been changed (to 1/2 UNF 20 threads per inch).
When purchasing a charge hose, be sure to confirm the port size.

As pressure is high and gasification speed is fast, it is difficult to

Electronic balance
for refrigerant charging ¡ read the indicated value by means of charging cylinder, as air
bubbles occur.

The size of opposite sides of flare nuts have been increased.

Torque wrench
(nominal diam. 1/2, 5/8) × Incidentally,
a common wrench is used for nominal diameters 1/4 and 3/8.

By increasing the clamp bar’s receiving hole, strength of spring in

Flare tool (clutch type)
¡ the tool has been improved.

Gauge for projection

adjustment — — Used when flare is made by using conventional flare tool.

Connected to conventional vacuum pump. It is necessary to use

an adapter to prevent vacuum pump oil from flowing back to the

¡
charge hose. The charge hose connecting part has two ports-one
Vacuum pump adapter for conventional refrigerant (7/16 UNF 20 threads per inch) and
one for R410A. If the vacuum pump oil (mineral) mixes with R410A
a sludge may occur and damage the equipment.

Gas leakage detector × Exclusive for HFC refrigerant.

• Incidentally, the “refrigerant cylinder” comes with the refrigerant designation (R410A) and protector coating in the
U. S’s ARI specified rose color (ARI color code: PMS 507).
• Also, the “charge port and packing for refrigerant cylinder” require 1/2 UNF 20 threads per inch corresponding to
the charge hose’s port size.

– 49 –
10-3. Indoor Unit 10-3-2. Drilling a Hole and Mounting Instal-
lation Plate
10-3-1. Installation Place
• A place which provides enough spaces around the Drilling a hole
indoor unit as shown in the diagram.
When install the refrigerant pipes from the rear.
• A place where there are no obstacle near the air
inlet and outlet.
• A place which allows easy installation of the piping
to the outdoor unit.
• A place which allows the front panel to be opened.
• The indoor unit shall be installed so that the top of
the indoor unit is positioned at least 2m in height.
Pipe
• Also, avoid putting anything on the top of the hole
∅65 mm
indoor unit.

CAUTION 100 mm

• Direct sunlight on the indoor unit wireless

receiver should be avoided. Fig. 10-3-2
• The microprocessor in the indoor unit should
not be too close to r-f sources.
(For details, see the owner's manual.)
1. After determining the pipe hole position on the
installation plate ( ð ) drill the pipe hole (Ø65
mm) at a slight downward slant to the outdoor
Remote controller side.
• Should be placed where there are no obstacles,
NOTE :
such as curtains, that may block the signal.
• Do not install the remote controller in a place • When drilling into a wall that contains a metal lath,
exposed to direct sunlight or close to a heating wire lath or metal plate, be sure to use a pipe hole
source, such as a stove. brim ring sold separately.
• Keep the remote controller at least 1 m away from
the nearest TV set or stereo equipment.
(This is necessary to prevent image disturbances or
noise interference.) Mounting the installation plate
• The location of the remote controller should be
determined as shown below.

Anchor bolt holes

62 82.5
Hook
2 m or more from floor

(Side view) (Top view)

Indoor unit

Indoor unit
170

85

Reception 1
Reception Remote range Hook Installation
range controller Pipe hole Hook
Remote controller Thread Pipe hole plate
Indoor unit 7
Weight Mounting screw

Fig. 10-3-1 Fig. 10-3-3

– 50 –
 When the installation plate is directly 10-3-3. Electrical Work
mounted on the wall 1. The supply voltage must be the same as the
rated voltage of the air conditioner.
1. Securely fit the installation plate onto the wall by
screws with the upper and lower catches, that 2. Prepare a power source for the exclusive use of
hold the indoor unit, facing out. the air conditioner.
2. To mount the installation plate on a concrete wall NOTE :
use anchor bolts. Drill the anchor bolt holes as
• Wire type :
illustrated in the above figure.
More than 1.5 mm2 H07RN-F or 60245IEC66.
3. Install the installation plate horizontally and level.
CAUTION
CAUTION
• This appliance can be connected to a main
When installing the installation plate with mount- circuit breaker in either of the following two
ing screw, do not use the anchor bolt hole. ways.
Otherwise the unit may fall down and result in
1. Connection to fixed wiring:
personal injury and property damage.
A switch or circuit breaker which discon-
nects all poles and has a contact separa-
tion of at least 3 mm must be incorporated
in the fixed wiring. An approved circuit
breaker or switch must be used.
Anchor bolt 2. Connection with power supply plug:
Attach power supply plug with power cord
Projection
and plug it into wall outlet. An approved
15mm or less power supply cord and plug must be used.

NOTE :
• Perform wiring work being sure the wire length is
Fig. 10-3-4 long enough.

5 mm dia. hole 10-3-4. Wiring Connection

How to connect the connecting cable

7 Mounting screw
Ø4 × 25L Wiring the connecting cable can be carried
out without removing the front panel.
Clip anchor
(local parts) 1. Remove the air inlet grille. Open the air inlet grille
upward and pull it toward you.
2. Remove the terminal cover and cord clamp.
Fig. 10-3-5
3. Insert the connecting cable (or as according to
local regulations/codes) into the pipe hole on the
wall.
CAUTION
4. Pull the connecting cable through the cable slot
Failure to securely install the unit may result in on the rear panel so that it protrudes about
personal injury and/or property damage if the 15 cm out of the front.
unit falls. 5. Insert the connecting cable fully into the terminal
block and secure it tightly with screws.
• In case of block, brick, concrete or similar type 6. Tightening torque: 1.2 N•m (0.12 kgf•m)
walls, drill 5 mm dia. holes in the wall. 7. Secure the connecting cable with the cord clamp.
• Insert clip anchors for the ‡ mounting screws. 8. Attach the terminal cover, rear plate bushing and
NOTE : air inlet grille on the indoor unit.
• Install the installation plate using mounting screws
between 4 to 6, being sure to secure all four
corners.

– 51 –
 10-3-5. Piping and Drain Hose Installation
CAUTION
• Be sure to refer to the wiring system diagram Piping and drain hose forming
labeled inside the front panel.
• Since condensation results in machine trouble,
• Check local electrical regulations for any make sure to insulate both the connecting pipes
specific wiring instructions or limitations. separately.
(Use polyethylene foam as insulating material.)

Rear right
Cord clamp

Piping preparation
Terminal block Rear left

drain hose
Changing
Terminal cover
Bottom left

Front panel slit

Screw
1 2
Left

Die-cutting
3

Bottom right
Earth line
Right

Fig. 10-3-10
Screw
Screw Connecting cable
1. Die-cutting front panel slit
Cut out the slit on the left or right side of the front
Fig. 10-3-6 panel for the left or right connection and the slit
on the bottom left or side of thefront panel for the
Terminal block bottom left or right connection with a pair of
nippers.
2. Changing drain hose
1 2 3
For left connection, left-bottom connection and
rear-left connection’s piping, it is necessary to
relocate the drain hose and drain cap.

Fig. 10-3-7
How to remove the drain cap
Clip drain cap with needle-nose pliers, and pull out.
Connecting cable

abou
t 15
cm

Fig. 10-3-8
Fig. 10-3-11
110 mm
Earth line
10 mm
How to remove the drain hose
The drain hose is secured in place by a screw.
Remove the screw securing the drain hose, then pull
out the drain hose.

10 mm
50 mm
Fig. 10-3-9

NOTE : Screw Drain hose

WIRE TYPE : more than 1.0mm2.(H07 RN-F or 60245
IEC 66). Fig. 10-3-12

– 52 –
 How to attach the drain cap In case of bottom right or bottom left piping
1. Insert hexagonal wrench (4 mm). • After making slits on the front panel with a knife or
similar tool, cut them out with a pair of nippers or
an equivalent tool.

Slit

Fig. 10-3-16
4 mm

Fig. 10-3-13
Left-hand connection with piping
2. Firmly insert drain cap. Bend the connecting pipes so that they are posi-
tioned within 43 mm above the wall surface.
If the connecting pipes are positioned more than
No gap 43 mm above the wall surface, the indoor unit may
Do not apply lubricating oil be unstable.
(refrigerant machine oil) When bending the connecting pipe, make sure to
when inserting the drain cap.
If applied, deterioration and use a spring bender to avoid crushing the pipe.
drain leakage of the drain
Insert a hexagon plug may occur.
wrench (Ø4mm) Refer to the table below for the bending
radius of each connection pipe.
Fig. 10-3-14 Outer diameter Bending radius
6.35 mm 30 mm
9.52 mm 40 mm
How to attach the drain hose
12.7 mm 50 mm
Always use the original screw that secured the
drain hose to the unit. If using a different screw
may cause water to leak. To connect the pipe after installation of the
Insert the drain hose firmly until the connector unit (figure)
contacts with the insulation, then secure it in place (To the front flare)
using the original screw.
270 mm
Gas side
230 mm
CAUTION Liquid side
Securely insert the drain hose and drain cap;
otherwise, water may leak.
R30 or less (Ø6.35), R40 or less (Ø9. 52), R50 or less (Ø12. 7)
Use polishing (polyethylene core or the like for bending pipe).
43 mm

Outward form of indoor unit

In case of right or left piping
• After making slits on the front panel with a knife or
similar tool, cut them out with a pair of nippers or
Use a screwdriver handle, etc.
an equivalent tool.

Fig. 10-3-17

NOTE :
If the pipe is incorrectly bent, the indoor unit may be
unstable on the wall.
Slit
After passing the connecting pipe through the pipe
hole, connect the connecting pipe to the auxiliary
Fig. 10-3-15 pipes and wrap the facing tape around them.

– 53 –
 10-3-7. Drainage
CAUTION
1. Run the drain hose at a downward sloped angle.
• Bind the auxiliary pipes (two) and connecting
cable with facing tape tightly. NOTE :
In case of leftward piping and rear-leftward • Hole should be made at a slight downward slant
piping, bind the auxiliary pipes (two) only with on the outdoor side.
facing tape.
Indoor unit Do not rise the drain hose. Do not form the drain hose
into the waved shape.
Auxiliary pipes
Connecting
cable 50 mm
Installation or more
plate

Fig. 10-3-18 Do not put the Do not put the drain

drain hose end hose end in the
• Carefully arrange the pipes so that none of the into water. drainage ditch.
pipes stick out of the rear plate of the indoor unit.
• Carefully connect the auxiliary pipes and
connecting pipes to each other and cut off the Fig. 10-3-21
insulating tape wound on the connecting pipe
to avoid double-taping at the joint, moreover,
2. Put water in the drain pan and make sure that the
seal the joint with the vinyl tape, etc.
water is being drained outside.
• Since condensation can result in machine
3. When connecting extension drain hose, insulate
performance trouble, be sure to insulate both
the connection part of extension drain hose with
connecting pipes. (Use polyethylene foam as
shield pipe.
insulating material.)
• When bending a pipe, be careful not to crush it.
Shield pipe

10-3-6. Indoor Unit Installation

Drain hose Inside the room Extension drain hose
1. Pass the pipe through the hole in the wall, and
hook the indoor unit on the installation plate at
the upper hooks.
2. Swing the indoor unit to right and left to confirm Fig. 10-3-22
that it is firmly hooked on the installation plate.
3. While pressing the indoor unit onto the wall, hook
it at the lower part on the installation plate.
CAUTION
Pull the indoor unit toward you to confirm that it is Install the drain pipe for proper drainage.
firmly hooked on the installation plate.
Improper drainage can result in water dripping
1 Hook here inside the room.
1 Installation
plate
This air conditioner has been designed to drain
2 water collected from condensation which forms on
Hook Push (unhook) the back of the indoor unit, to the drain pan.
Fig. 10-3-19 Therefore, do not locate the power cord and other
parts at a high place than the drain guide.
• For detaching the indoor unit from the installation
plate pull the indoor unit toward you while pushing
the bottom up at the specified places. Wall

Drain
guide

Space for
pipes

Push Push
Fig. 10-3-20 Fig. 10-3-23

– 54 –
 11. HOW TO DIAGNOSE THE TROUBLE

11-1. First Confirmation

11-1-1. Confirmation of Power Supply
Confirm that the power breaker operates (ON) normally.

11-1-2. Confirmation of Power Voltage

Confirm that power voltage is AC 220–230–240 ± 10%.
If power voltage is not in this range, the unit may not operate normally.

11-1-3. Operation Which is not a Trouble (Program Operation)

For controlling the air conditioner, the program operations are built in the microcomputer as described in the
following table.
If a claim is made for running operation, check whether or not it meets to the contents in the following table.
When it does, we inform you that it is not trouble of equipment, but it is indispensable for controlling and main-
taining of air conditioner.

Table 11-1-1

No. Operation of air conditioner Description

1 When power breaker is turned “ON”, the The OPERATION lamp of the indoor unit flashes when
operation indicator (Green) of the indoor power source is turned on. If [START/STOP] button is
unit flashes. operated once, flashing stops.
(Flashes also in power failure)

2 Compressor may not operate even if the The compressor does not operate while compressor
room temperature is within range of restart delay timer (3-minutes timer) operates.
compressor-ON. The same phenomenon is found after power source has
been turned on because 3-minutes timer operates.

3 In Dry and ECO mode, FAN (air flow) The air flow indication is fixed to [AUTO].
display does not change even though FAN
(air flow select) button is operated.

4 Increasing of compressor motor speed For smooth operation of the compressor, the compres-
stops approx. 30 seconds after operation sor motor speed is restricted to Max. 41 rps for 2 min-
started, and then compressor motor speed utes, and Max.91 rps for 2 minutes to 3 minutes, respec-
increases again approx. 30 seconds after. tively after the operation has started.

5 In AUTO mode, the operation mode is After selecting Cool or Heat mode, select an operation
changed. mode again if the compressor keeps stop status for 15
minutes.

6 In HEAT mode, the compressor motor The compressor motor speed may decrease by high-
speed does not increase up to the maxi- temp. release control (Release protective operation by
mum speed or decreases before the temp.-up of the indoor heat exchanger) or current
temperature arrives at the set temperature. release control.

– 55 –
11-2. Primary Judgment
To diagnose the troubles, use the following methods.
1) Judgment by flashing LED of indoor unit
2) Self-diagnosis by service check remote controller
3) Judgment of trouble by every symptom

Firstly use the method 1) for diagnosis. Then, use the method 2) or 3) to diagnose the details of troubles.

11-3. Judgment by Flashing LED of Indoor Unit

While the indoor unit monitors the operation status of the air conditioner, if the protective circuit operates, the
contents of self-diagnosis are displayed with block on the indoor unit indication section.

Table 11-3-1

Check
Item code Block display Description for self-diagnosis

OPERATION (Green)
A Power failure (when power is ON)
Indoor indication Flashing display (1 Hz)
lamp flashes.

OPERATION (Green)
B Protective circuit operation for indoor P.C. board
Which lamp Flashing display (5 Hz)
does flash?

OPERATION (Green)
Protective circuit operation for connecting cable
C TIMER (Yellow)
and serial signal system
Flashing display (5 Hz)

OPERATION (Green)
D FILTER (Orange) Protective circuit operation for outdoor P.C. board
Flashing display (5 Hz)

OPERATION (Green)
TIMER (Yellow) Protective circuit operation for others
E
FILTER (Orange) (including compressor)
Flashing display (5 Hz)

NOTES :
1. The contents of items B and C and a part of item E are displayed when air conditioner operates.
2. When item B and C, and item B and a part of item E occur concurrently, priority is given to the block of item B.
3. The check codes can be confirmed on the remote controller for servicing.

– 56 –
11-4. Self-Diagnosis by Remote Controller (Check Code)
1. If the lamps are indicated as shown B to E in Table 11-3-1, execute the self-diagnosis by the remote controller.
2. When the remote controller is set to the service mode, the indoor controller diagnoses the operation condi-
tion and indicates the information of the self-diagnosis on the display of the remote controller with the check
codes. If a fault is detected, all lamps on the indoor unit will flash at 5Hz and it will beep for 10 seconds
(Beep, Beep, Beep ... ). The timer lamp usually flashes (5Hz) during self-diagnosis.

11-4-1. How to Use Remote Controller in Service Mode

1 Press [CHECK] button with a tip of pencil to set the

remote controller to the service mode.
• “ ” is indicated on the display of the remote
controller.

TOSHIBA
2 Press [ON ] or [OFF ] button
If there is no fault with a code, the indoor unit will beep
once (Beep) and the display of the remote controller will
change as follows :

PR ESET FAN •••

T E MP

TEMP
ONE -T OUC H MODE
• The TIMER indicator of the indoor unit flashes continuously.
(5 times per 1 sec.)
QUIE T P UR E
C OMF OR T
SLEEP
• Check the unit with all 52 check codes ( to )
as shown in Table-11-4-1.
S WING F IX Hi-P OWE R ECO • Press [ON ] or [OFF ] button to change the check
code backward.
T IME R CLR
If there is a fault, the indoor unit will beep for 10
ON OF F
SLEEP SET
seconds (Beep, Beep, Beep...).
C HK F IL T E R C L OC K Note the check code on the display of the remote
controller.
• 2-digits alphanumeric will be indicated on the display.
• All indicators on the indoor unit will flash.
(5 times per 1 sec.)

3 Press [CLR] button. After service finish for clear

service code in memory.
Alphanumeric characters are • "7F" is indicated on the display of the remote
used for the check codes. control.
is 5. is 6.
is A.
is C.
is B.
is D.
4 Press [START/STOP] button to release the service mode.
• The display of the remote controller returns to as it
was before service mode was engaged.

Fig. 11-4-1

– 57 –
11-4-2. Caution at Servicing
1. After servicing, press the START/STOP button to return to the normal mode.
2. After servicing by the check code, turn off breaker of the power supply, and turn on breaker of the power
supply again so that memory in the microcomputer returns the initial status.
However, the check codes are not deleted even if the power supply is turned off because they are stored in
the fixed memory.
3. After servicing, press [CLR] button under check mode status and then send the check code “7F” to the
indoor unit. The error code stored in memory is cleared.

Table 11-4-1

Block distinction Operation of diagnosis function

Air Judgment and action

Check Block Check Cause of operation conditioner Remarks
code code status

Indoor P.C. Short-circuit or discon- Operation Displayed when 1. Check the room temp. sensor.
board etc. nection of the room continues. error is detected. 2. When the room temp. sensor is
temperature sensor normal, check P.C. board.
(TA sensor).

Being out of place, Operation Displayed when 1. Check heat exchanger sensor.
disconnection, short- continues. error is detected. 2. When heat exchanger sensor is
circuit, or migration of normal, check P.C. board.
heat exchanger sensor
(TC sensor)

Lock of indoor fan or All off Displayed when 1. Check the motor.
trouble on the indoor fan error is detected. 2. When the motor is normal,
circuit check P.C. board.

Not Trouble on other indoor Operation Displayed when Replace P.C. board.
displayed P.C. boards continues. error is detected.

Connecting Return serial signal is not Operation Flashes when 1. When the outdoor unit never
cable and sent to indoor side from continues. trouble is detected operate:
serial signal operation started. on Return serial 1) Check connecting cable, and
1) Defective wiring of signal, and normal correct if defective wiring.
connecting cable status when signal
is reset. 2) Check 25A fuse of inverter
2) Operation of compres- P.C. board.
sor thermo Gas 3) Check 3.15A of inverter P.C.
shortage Gas leak board.
2. To display [Other] block during
operation, check compressor
thermo. operation and supply
gas (check gas leak also).
3. Unit operates normally during
check.
If return serial signal does not
stop between indoor terminal
board 2 and 3, replace inverter
P.C. board.
If signal stops between indoor
terminal board 2 and 3, replace
indoor P.C. board.

– 58 –
 Block distinction Operation of diagnosis function
Air Judgment and action
Check Check
Block Cause of operation conditioner Remarks
code code
status
Outdoor P.C. Inverter over-current All off Displayed when Even if trying operation again, all
board protective circuit error is detected. operations stop immediately. :
operates. (Short time) Replace P.C. board.
Position-detect circuit All off Displayed when 1. Even if connecting lead wire of
error or short-circuit error is detected. compressor is removed,
between windings of position-detect circuit error
compressor occurred. : Replace P.C. board.
2. Measure resistance between
wires of compressor, and
perform short-circuit. : Replace
compressor.
Current-detect circuit All off Displayed when Even if trying operation again, all
error error is detected. operations stop immediately. :
Replace P.C. board.
Being out of place, All off Displayed when 1. Check sensors (TE, TS).
disconnection or short- error is detected. 2. Check P.C. board.
circuit of the outdoor
heat exchanger sensor
(TE) or suction temp.
sensor (Ts)
Disconnection or short- All off Displayed when 1. Check discharge temp. sensor
circuit of discharge error is detected. (TD).
temp. sensor 2. Check P.C. board
Outdoor fan drive All off Displayed when Position-detect error, over-current
system error error is detected. protective operation of outdoor fan
drive system, fan lock, etc. :
Replace P.C. board or fan motor.
Not Outdoor heat exchanger Operation 1. Check outdoor temp. sensor
displayed temp. sensor error continues —— (TO).
2. Check P.C. board.
Outdoor P.C. Compressor drive output All off Displayed when Check 5-serial LED of outdoor unit.
board error, Compressor error error is detected. When 20 seconds passed after
(lock, missing, etc.), start-up, position-detect circuit error
Break down occurred. : Replace compressor.
Trouble on P.M.V.
Others Return serial signal has Operation Flashes when 1. Repeat Start and Stop with
(including been sent when continues trouble is detected interval of approx. 10 to 40
compressor) operation started, but it on return serial minutes. (Code is not displayed
is not sent from halfway. signal, and normal during operation.)
1) Compressor thermo. status when signal Supply gas.
operation is reset. (Check also gas leak).
Gas shortage 2. Unit operates normally during
Gas leak check.
2) Instantaneous power If return serial signal does not
failure stop between indoor terminal
block 2 and 3, replace inverter
P.C. board.
If signal stops between indoor
terminal block 2 and 3, replace
indoor P.C. board.
Compressor does not All off Displayed when 1. Trouble on compressor
rotate. error is detected. 2. Trouble on wiring of compressor
(Current protective (Missed phase)
circuit does not operate
when a specified time
passed after compressor
had been activated.)
Discharge temp. All off Displayed when 1. Check dischage temp. sensor
exceeded 117°C error is detected. (TD).
2. Gas leakage
3. Trouble on P.M.V.
Break down of All off Displayed when 1. Check power voltage.
compressor error is detected. (220–230–240 V +10%)
2. Overload operation of refrigera-
tion cycle
Check installation condition
(Short-circuit of outdoor diffuser).
4-way valve inverse error Operation 1. Check 4-way valve operation.
(TC sensor value continues
——
lowered during heating
operation.)

– 59 –
 Revised-2

11-5. Judgment of Trouble by Every Symptom

11-5-1. Indoor Unit (Including Remote Controller)
(1) Power is not turned on (Does not operate entirely)
<Primary check>
1. Is the supply voltage normal?
2. Is the normal voltage provided to the outdoor unit?
3. Is the crossover cable connected properly?
4. Is the fuse (F01) blown?
Operation
( RAS-M07, 10,13 Series )
Check Item

Considerable principle cause

Turn off power supply once, and

5 second later, turn it on again. Measures

NO
Item by symptoms
Is OPERATION indicator flashing?
YES

Is it possible to turn on NO Does transmission mark NO

power supply by pushing on remote controller flash
[START/STOP] button normally,and is its signal Remote controller is defective.
on remote controller? transmitted properly?
YES YES
Refer to (5) “Troubleshooting
Unit operates normally. for remote controller”.

Is fuse (F01) YES Parts (R01, C01, C02, R02,

of indoor control C03, D01, D02, D03, D04,
board blown? T101) are defective.
NO

Is voltage
NO (DC12V or 5V) YES
Microcomputer
indicated on rear of Replace main
indoor control is defective.
P.C. board
board normal?

Parts of a power supply circuit

defective.

• Be sure to disconnect the motor connector CN31 after shut off the power supply, or it will be a cause of
damage of the motor.

(2) Power is not turned on though Indoor P.C. board is replaced

<Confirmation procedure>

Turn on power supply.

NO NO
Does OPERATION indicator flash? Is wired correctly to white and
black lead wires of terminal block? Correct wiring.

YES YES
To item of
“Power supply is not turned on”.

– 60 –
 ( RAS-M16 Series )

Operation

Check Item

Considerable principle cause

Turn off power supply once, and

5 second later, turn it on again. Measures

NO
Item by symptoms
Is OPERATION indicator flashing?
YES

Is it possible to turn on NO Does transmission mark NO

power supply by pushing on remote controller flash
[START/STOP] button normally,and is its signal Remote controller is defective.
on remote controller? transmitted properly?
YES YES
Refer to (5) “Troubleshooting
Unit operates normally. for remote controller”.

Is fuse (F01) YES Does fan YES

of indoor control Parts (R04, R05, DB01, C01, motor connector
board blown? C03, IC01 and T01) are defective. between CN10 1 –
3 short-circuit?
NO
NO
Is voltage
NO (DC12V or 5V) YES
indicated on rear of Microcomputer Replace main
indoor control is defective. P.C. board
board normal?

Is DC310–340V NO
supplied between Parts of a power supply circuit
CN10 1 – 3 ? defective.

YES Replace fan

motor.

• Be sure to disconnect the motor connector CN31 after shut off the power supply, or it will be a cause of
damage of the motor.

(2) Power is not turned on though Indoor P.C. board is replaced

<Confirmation procedure>

Turn on power supply.

NO NO
Does OPERATION indicator flash? Is wired correctly to white and
black lead wires of terminal block? Correct wiring.

YES YES
To item of
“Power supply is not turned on”.

– 61 –
 Revised-2

(3) Only the indoor motor fan does not operate

<Primary check>
1. Is it possible to detect the power supply voltage (AC220–240V) between Q and R on the terminal block?
2. Does the indoor fan motor operate in cooling operation?
(In heating operation, the indoor fan motor does not operate for approximately 10 minutes after it is turned
on, to prevent a cold air from blowing in.)
( RAS-M07, 10,13 Series )

Turn off power

supply once, and
turn it on again.

YES
Does fan motor Control P.C. board failure
continue to operate?

Start to operate
indoor unit in cooling
operation at airflow
level “LOW”.

Dose AC120V or NO
Does indoor NO ligher voltage apply to Replace main
fan operate? between red and black lead P.C. board.
of the motor?
YES
YES

Change airflow level

to “HIGH”. Turn OFF the power

Is it possible to NO Replace
rotate cross-flow fan by bearing.
hand properly?

YES

Turn OFF the power

Is it possible to NO
change airflow level Stop the operation
to “HIGH”?
YES

When rotating the

cross-flow fan by hand
at the operation stopNO
condition, is the rotation signal NO
(DC+12V 0V) detected between Replace the fan motor.
2 (Purple lead) and 3
(Blue lead) of the motor
connector (CN33)
(1 pulse / 1 revolutio).

YES

Fan motor Motor circuit (D301, IC31, Q301

12V power circuit (T101) failure. Replace the P.C. board.
operates normally.

– 62 –
( RAS-M16 Series )

Turn off power

supply once, and
turn it on again.

Is it possible to detect
Does fan motor
YES DC 1V or more between NO
continue to operate? 5 + and 3 – of
motor connector (CN31). Peplace indoor
NO fan motor.
YES
Start to operate
indoor unit in cooling
operation at airflow
level “LOW”.

Is it possible to detect
Does indoor
NO DC 310–340V between NO
fan operate? 1 + and 3 – of motor
connector (CN31).
YES
YES
Turn off indoor unit and remove
(Motor connection condition)
Is it possible to detect DC 15V NO connector from motor.
Then push START/STOP button
between 4 + and 3 – of on remote controller to stop
motor connector (CN31). flashing lamp on indoor unit.
YES

Is it possible to detect
Change airflow level DC 15V between 4 + NO Peplace main
to “HIGH”. and 3 – of motor P.C. board.
connector (CN31).
YES
Start to operate the
indoor unit in except
heating operation. NO Turn off indoor unit and
At this time, is it possible to remove connector from motor.
detect DC 1V or more between Then start to operate indoor
5 + and 3 – of motor
unit with remote controller.
connector (CN31)?

YES
Start to operate the
indoor unit in except
heating operation.
Is it possible to NO At this time, is it possible NO
change airflow level to detect DC 1V or more
to “HIGH”? between 5 + and 3 –
of motor connector (CN31)?
YES (Check this condition
within 15 seconds after
starting unit.)

YES
Is it possible to NO Peplace
rotate cross-flow fan by
hand properly? bearing.

YES

Turn off indoor unit

and rotate cross-flow
fan by hand when the
unit is on standby. NO
At this time, is it possible to
detect DC 1V or more
between 5 + and 3 –
of motor connector
(CN31).
Fan motor
operates normally. YES

– 63 –
(4) Indoor fan motor automatically starts to rotate by turning on power supply
(For DC fan motor in RAS-M16SKV-E, RAS-M16SKCV-E)
<Cause>
The IC is built in the indoor fan motor. Therefore the P.C. board is also mounted to inside of the motor.
If the P.C. board is soldered imperfectly or the IC is defective, the fan motor may automatically rotate by turning
on power supply.
<Inspection procedure>
1. Remove the front panel. (Remove 2 screws.)
2. Remove the cover of the fan motor lead wires.
3. Check DC voltage with CN31 connector while the fan motor is rotating.
NOTE :
• Do not disconnect the connector while the fan motor is rotating.
• Use a thin test rod.

Indoor fan starts rotating when power supply is turned on.

P.C. board
CN31
(Check output DC voltage of fan motor on P.C. board.)
6 (Blue)
Yellow 5 (Yellow)
Measure voltage between 3 (GND : BLACK) 4 (White)
and 5 (V line : YELLOW) of motor connector (CN31) Black 3 (Black)
while indoor fan motor is rotating.
2 –
1 (Red)

DC 1.0V or more Under DC 1.0V

DC

P.C. board is defective. Motor is defective.

Replace P.C. board. Replace motor.

– 64 –
 Revised-2
(For AC fan motor in RAS-M07, 10,13SKV-E, RAS-M10,13SKCV-E)

<Inspection procedure>
1. Remove the front panel. (Remove 2 screws.)
2. Remove the cover of the fan motor lead wires.
3. Check AC voltage with CN31 connector while the fan motor is rotating.
NOTE :
• Using a tester, measure the resistance value of each winding coil.
• Use a thin test rod.

AFS-220-20-4AR
• Do not disconnect the connector while the fan motor is rotating.
• For P.C. board side, proceed to the item "Only indoor fan does not oper-
ate" of "Judgment of Trouble by Every Symptom".

WHI
5
CN31 BLK BLK BLK
3 3 3
WHI WHI
RED 2 2
1 RED RED
1 1

BLU BLU BLU

3 3 3
CN33 2 PUR PUR 2 2 PUR
GRY 1 1 GRY
1 GRY
P.C. board

Position (P.C. board) Resistance value

Between 3 (Black) - 1 (Red) 74 ± 15 Ω

Between 3 (Black) - 5 (White) 100 ± 20 Ω

Between 1 (Red) - 5 (White) 174 ± 35 Ω

– 65 –
(5) Troubleshooting for remote controller
<Primary check>
Check that A or B selected on the main unit is matched with A or B selected on the remote controller.

The unit does not beep at all.

Push the START/STOP button. Operation lamp on indoor
unit is not indicated.

NO
Is transmission
mark indicated?

YES

Is receiver Push RESET button

on indoor unit NO
on remote controller
exposed to with tip of pencil.
direct sunlight?
YES
Is there any Does indoor unit
thyristor NO NO operate when moving
fluorescent light remote controller
nearby? near receiver or
indoor unit?
YES
YES

Batteries are
exhausted.

Push the START/

STOP button
Does indoor unit
NO start to operate by
automatic restart Is transmission NO
function? mark indicated?
YES YES
NO Does indoor unit
beep and operate?

YES
Does radio sound
is affected by remote NO
controller when a signal is
transmitted at distance of
5 cm from radio?
YES

P.C. board Remote controller

is defective. is defective.

Keep indoor unit

Avoid direct away from thyristor Replace Replace Normal Replace
sunlight. fluorescent light. P.C. board. batteries. operation remote controller.

NOTE : After replacing batteries,

push the RESET button
with a tip of a pencil.

– 66 –
11-5-2. Wiring Failure (Interconnecting and Serial Signal Wire)
(1) Outdoor unit does not operate
1) Is the voltage between R and S of the indoor terminal block varied?
Confirm that transmission from indoor unit to outdoor unit is correctly performed based upon the follow-
ing diagram.
NOTE:
• Measurement should be performed 2 minutes and 30 seconds after starting of the operation.
• Be sure to prepare a diode for judgment.

Terminal block at indoor side

Red 3 S5277G or equivalent (G or J type)
S5277G (Diode with rated voltage of 400V
White 2 or more is acceptable.)

1 Terminal block Tester

Normal time : Voltage swings between DC15 and 60V. ...................Inverter Assembly check (11-8-1.)
Abnormal time : Voltage does not vary.

(2) Outdoor unit stops in a little while after operation started

<Check procedure> Select phenomena described below.
1) The outdoor unit stops 10 to 20 minutes after operation started, and 10 minutes or more are required to
restart the unit.

Gas circulation amount is down. Gas shortage

Gas leak
Measure gas pressure. Pipe clogging

Thermo. operation of compressor

2) If the unit stops once, it does not operate until the power will be turned on again.

To item of Outdoor unit does not operate.

3) The outdoor unit stops 10 minutes to 1 hour after operation started, and an alarm is displayed.
(Discharge temp. error check code 03, 1E Sensor temp. error check code 02, 1C)

Gas leak
P.M.V. is defective. Refer to the service manual
Miswiring of connecting wires of indoor/outdoor units of the outdoor unit.
Clogging of pipe and coming-off of TC sensor

– 67 –
11-9. How to Check Simply the Main Parts
11-9-1. How to Check the P.C. Board (Indoor Unit)
(1) Operating precautions
1) When removing the front panel or the P.C. board, be sure to shut off the power supply breaker.
2) When removing the P.C. board, hold the edge of the P.C. board and do not apply force to the parts.
3) When connecting or disconnecting the connectors on the P.C. board, hold the whole housing. Do not pull
at the lead wire.
(2) Inspection procedures
1) When a P.C. board is judged to be defective, check for disconnection, burning, or discoloration of the
copper foil pattern or this P.C. board.
2) The P.C. board consists of the following 2 parts
a. Main P.C. board part :
DC power supply circuit, Indoor fan motor control circuit, CPU and peripheral circuits,
buzzer, and Driving circuit of louver.
b. Indication unit of infrared ray receiving infrared ray receiving circuit, LED :
To check defect of the P.C. board, follow the procedure described below.

– 68 –
 Revised-2

(3) Check procedures

( RAS-M07, 10,13 Series )
Table 11-9-1

No. Procedure Check points Causes

1 Turn off the power supply breaker Check whether or not the fuse (F01) Impulse voltage was applied or the
and remove the P.C. board is blown. indoor fan motor short-circuited.
assembly from electronic parts
base. Remove the connecting
cables from the terminal block.

2 Remove the connector of the Check power supply voltage : 1. The terminal block or the crossover
motor and turn on the power 1. Between No. 1 and No. 3 of CN01 cable is connected wrongly.
supply breaker. If OPERATION (AC 220–240V) 2. The capacitor (C01), line filter
indicator flashes (once per 2. Between and of C03 (L01), resistor (R02), or the diode
second), it is not necessary to (DC 310–340V) (D01, D02, D03, D04) is defective.
check steps (1 to 3) in the right 3. T101 is defective.
next column. 3. Between 12V and GND
4. Between 5V and GND 4. IC12 and T101 are defective.

3 Push [START/STOP] button once Check power supply voltage : IC51 and IC52 are defective.
to start the unit. (Do not set the 1. Between CN51 and
mode to On-Timer operation.) No. 1 of CN01 (DC 15–60V)

4 Shorten the restart delay timer Check whether or not all indicators The indicators are defective or the
and start unit. (OPERATION, TIMER, FILTER, housing assembly (CN21) is defective.
PURE) are lit for 3 seconds and they
return to normal 3 seconds later.

5 Push [START/STOP] button once 1. Check whether or not the com- 1. The temperature of the indoor heat
to start the unit, pressor operates. exchanger is extremely low.
• Shorten the restart delay timer. 2. Check whether or not the OP- 2. The connection of the heat ex-
• Set the operation mode to ERATION indicator flashes. changer sensor is loose.
COOL. (The connector is disconnected.)
(CN62)
• Set the fan speed level to
AUTO. 3. The heat exchanger sensor and the
P.C. board are defective.
• Set the preset temperature
(Refer to Table 11-4-1.)
much lower than the room
temperature. (The unit (com- 4. The main P.C. board is defective.
pressor) operates continuously
in the above condition.)

6 If the above condition (No. 5) still 1. Check whether or not the com- 1. The temperature of the indoor heat
continues, start the unit in the pressor operates. exchanger is extremely high.
following condition. 2. Check whether or not the OP- 2. The connection of the heat ex-
• Set the operation mode to ERATION indicator flashes. changer sensor short-circuited.
HEAT. (CN62)
• Set the preset temperature 3. The heat exchanger sensor and the
much higher than room tem- P.C. board are defective.
perature. (Refer to Table 11-4-1.)
4. The main P.C. board is defective

7 Connect the motor connector to 1. Check it is impossible to detect 1. The indoor fan motor is defective.
the motor and turn on the power the voltage (AC120V or higher (Protected operation of P.C. board.)
supply. voltage) between red and black 2. The P.C. board is defective.
Start the unit the following lead of the motor. 3. The connection of the motor
condition. 2. The motor does not operate or connector is loose.
• Set the fan speed level to HIGH. the fan motor does not rotate with
(The unit (compressor) operates high speed.
continuously in the above (But it is possible to receive the
condition in No. 5.) signal from the remote controller.)
3. The motor rotates but vibrates
strongly.

– 69 –
( RAS-M16 Series )

Table 11-9-1

No. Procedure Check points Causes

1 Turn off the power supply breaker Check whether or not the fuse (F01) Impulse voltage was applied or the
and remove the P.C. board is blown. indoor fan motor short-circuited.
assembly from electronic parts
base. Remove the connecting
cables from the terminal block.

2 Remove the connector of the Check power supply voltage : 1. The terminal block or the crossover
motor and turn on the power 1. Between No. 1 and No. 3 of CN23 cable is connected wrongly.
supply breaker. If OPERATION (AC 220–240V) 2. The capacitor (C01), line filter
indicator flashes (once per 2. Between and of C03 (L01), resistor (R02), or the diode
second), it is not necessary to (DC 310–340V) (DB01) is defective.
check steps (1 to 3) in the right 3. IC11, IC13 and T101 are defective.
next column. 3. Between of C10 and output
side of IC08 (DC 15V) 4. IC11, IC13 and T101 are defective.
4. Between 12V and GND 5. IC11, IC13, IC14 and T101 are
5. Between 5V and GND defective.

3 Push [START/STOP] button once Check power supply voltage : IC51 and IC52 are defective.
to start the unit. (Do not set the 1. Between CN51 and
mode to On-Timer operation.) No. 1 of CN01 (DC 15–60V)

4 Shorten the restart delay timer Check whether or not all indicators The indicators are defective or the
and start unit. (OPERATION, TIMER, FILTER, housing assembly (CN21) is defective.
PURE) are lit for 3 seconds and they
return to normal 3 seconds later.

5 Push [START/STOP] button once 1. Check whether or not the com- 1. The temperature of the indoor heat
to start the unit, pressor operates. exchanger is extremely low.
• Shorten the restart delay timer. 2. Check whether or not the OP- 2. The connection of the heat ex-
• Set the operation mode to ERATION indicator flashes. changer sensor is loose.
COOL. (The connector is disconnected.)
(CN62)
• Set the fan speed level to
AUTO. 3. The heat exchanger sensor and the
P.C. board are defective.
• Set the preset temperature
(Refer to Table 11-4-1.)
much lower than the room
temperature. (The unit (com- 4. The main P.C. board is defective.
pressor) operates continuously
in the above condition.)

6 If the above condition (No. 5) still 1. Check whether or not the com- 1. The temperature of the indoor heat
continues, start the unit in the pressor operates. exchanger is extremely high.
following condition. 2. Check whether or not the OP- 2. The connection of the heat ex-
• Set the operation mode to ERATION indicator flashes. changer sensor short-circuited.
HEAT. (CN62)
• Set the preset temperature 3. The heat exchanger sensor and the
much higher than room tem- P.C. board are defective.
perature. (Refer to Table 11-4-1.)
4. The main P.C. board is defective

7 Connect the motor connector to 1. Check it is impossible to detect 1. The indoor fan motor is defective.
the motor and turn on the power the voltage (DC 15V) between 3 (Protected operation of P.C. board.)
supply. and 4 of the motor terminals. 2. The P.C. board is defective.
Start the unit the following 2. The motor does not operate or 3. The connection of the motor
condition. the fan motor does not rotate with connector is loose.
• Set the fan speed level to HIGH. high speed.
(The unit (compressor) operates (But it is possible to receive the
continuously in the above signal from the remote controller.)
condition in No. 5.) 3. The motor rotates but vibrates
strongly.

– 70 –
 Revised-2

11-9-2. P .C . Board Layout

( RAS-M07, 10, 13 Series )

+5V

+12V

[1] Sensor characteristic table

100
90
80
Resistance value (k )

70
60
50
40
TA, TC, TCJ
30 TA : Room temp. sensor
20 TC : Heat exchanger temp. sensor
TCJ : Heat exchanger temp. sensor
10
0
0 10 20 30 40 50
Temperature (˚C)

– 71 –
( RAS-M16 Series )

GND

+12V +5V

[1] Sensor characteristic table

100
90
80
Resistance value (k )

70
60
50
40
30 TA, TC, TCJ
TA : Room temp. sensor
20 TC : Heat exchanger temp. sensor
TCJ : Heat exchanger temp. sensor
10
0
0 10 20 30 40 50
Temperature (˚C)

– 92 –
11-9-3. Indoor Unit (Other Parts)
No. Part name Checking procedure
1 Room temp. (TA) sensor Disconnect the connector and measure the resistance value with tester.
Heat exchanger (TC, TCJ) (Normal temp.)
sensor Temperature
Sensor 10°C 20°C 25°C 30°C 40°C
TCJ, TA, TC (kΩ) 20.7 12.6 10.0 7.9 4.5

2 Remote controller Refer to 11-5-1. (5).

3 Louver motor Measure the resistance value of each winding coil by using the tester.
MP24Z3T (Under normal temp. 25°C)
White 1 1 Position Resistance value
Yellow 2 2 1 to 2
Yellow 3 3 1 to 3 250 ± 20Ω
Yellow 4 4 1 to 4
Yellow 5 5 1 to 5

4 Indoor fan motor Refer to 11-5-1. (3) and (4).

– 73 –
 12. HOW TO REPLACE THE MAIN PARTS

WARNING
• Since high voltages pass through the electrical parts, turn off the power without fail before proceeding with
the repairs.
Electric shocks may occur if the power plug is not disconnected.
• After the repairs have been completed (after the front panel and cabinet have been installed), perform a
test run, and check for smoking, unusual sounds and other abnormalities.
If this check is omitted, a fire and/or electric shocks may occur.
Before proceeding with the test run, install the front panel and cabinet.
• Ensure that the following steps are taken when doing repairs on the refrigerating cycle.
1. Do not allow any naked flames in the surrounding area.
If a gas stove or other appliance is being used, extinguish the flames before proceeding.
If the flames are not extinguished, they may ignite any oil mixed with the refrigerant gas.
2. Do not use welding equipment in an airtight room.
Carbon monoxide poisoning may result if the room is not properly ventilated.
3. Do not bring welding equipment near flammable objects.
Flames from the equipment may cause the flammable objects to catch fire.
• If keeping the power on is absolutely unavoidable while doing a job such as inspecting the cir-
cuitry, wear rubber gloves to avoid contact with the live parts.
Electric shocks may be received if the live parts are touched.
High-voltage circuits are contained inside this unit.
Proceed very carefully when conducting checks since directly touching the parts on the control circuit
board may result in electric shocks.

12-1. Indoor Unit

No. Part name Procedures Remarks

 Front panel 1) Stop operation of the air conditioner and

turn off its main power supply.
2) Open the air inlet grille, push the arm
toward the outside, and remove the grille.

3) Press "PUSH" part under the front panel

and remove hooks of the front panel from
the installation plate. Installation plate

Front panel

Press

– 74 –
No. Part name Procedures Remarks

 Front panel 5) Remove the front panel fixing screws.

(2 pcs.)
6) Take off three hooks of panel from rear
side.

2 Screws

Three hooks

<How to assemble the front panel>

1) Press three center positions and two lower center positions of the air outlet, and
then hang the hanging hooks (3 pcs.) at the top side of the front panel to the rear
plate.

2) Tighten two screws.

• Incomplete hanging or incomplete pressing may cause a dewdrops or generation
of a fluttering sound.

– 75 –
No. Part name Procedures Remarks

k Electric parts 1) Follow the procedure up to 3) in ‚ above.

box assembly 2) Remove screw of earth lead attached to the
end plate of the evaporator.
3) Remove the lead wire cover, and remove
connector for the fan motor and connec-
tor for the louver motor from the electric
parts box assembly.
4) Pull out TC sensor from sensor holder of the
Electric part
evaporator. box cover
5) Pull out TCJ sensor from sensor holder of
the evaporator.
6) Disengage the display unit by simply pushing
TCJ sensor
at the top of the display unit. TC sensor
Fan motor
Earth Screw connector
7) Remove the fixing screw that secures the
electric parts box assembly, and remove the
assembly.

Fixing screw AC fan motor

connector
(For RAS-M10,
M13 models only)
Louver motor
connecto

<How to assemble the electric parts box>

1) Hook the top part of the electric parts box
assembly onto the claws on the back body,
and secure it using the fixing screw.
Now attach the display unit. Connect the
connectors for the fan motor and louver motor.
2) Secure the grounding wire using the fixing
screw. Insert the TC sensor into the sensor
holder.
* Be absolutely sure to loop the grounding
wire and TC sensor leads once at the
bottom.

– 76 –
No. Part name Procedures Remarks

l Horizontal louver 1) Remove shaft of the horizontal

louver from the back body.
(First remove the left shaft, and
then remove other shafts while
sliding the horizontal louver
leftward.)

m Evaporator 1) Follow to the procedure in the item k .

(Heat exchanger) 2) Remove the pipe holder from the rear side of the main unit.
3) Remove two fixing screws at the left side of the end plate of the heat exchanger.

2 screws

4) Remove one fixing screw on the

heat exchage fixing holder to separate the Heat exchanger fixing Screw
heat exchage from the back body. holder

5) Remove right side of the end plate from

two fixing rib while sliding slightly the
heat exchanger rightward.

Rib on the right side of the end plate

– 77 –
No. Part name Procedures Remarks

n Bearing 1) Follow to the procedure in the item m.

2) Remove the two screws used to secure the
bearing base.

Two screws

3) Remove the bearing base.

<Caution at assembling>
• If the bearing is out from the housing, push it
into the specified position and then incorporate
it in the main body.
Bearing
Bearing base

– 78 –
No. Part name Procedures Remarks

o Fan motor 1) Follow to the procedure till item m.

2) Loosen the set screw of the cross flow fan.
3) Remove two fixing screws of the motor cover
and them remove the motor cover.
4) Remove two more fixing screws of the
motor band and remove the motor band.

Set screw

Two Screws Two screws on

motor band
Motor cover

5) Pull the fan motor outward.

– 79 –
No. Part name Procedures Remarks

p Cross flow fan <Caution at reassembling>

5 mm
1) To incorporate the fan motor, remove the fan
motor rubber (at shaft core side), incorporate
the motor into the position in the following
figure, and then install the fan motor.

• Install the cross flow fan so that the right

end of the 1st joint from the right of the
cross flow fan is set keeping 70.5 mm from
wall of rear plate of the main unit.
• Holding the set screw, install the cross flow
fan so that U-groove of the fan motor comes
to the mounting hole of the set screw.

• Perform positioning of the fan motor as

follows:
• When assembling the fan motor, the fan
motor must be installed in such a way that
the fan motor leads will be taken out is
positioned at the bottom front.
• After assembling the two hooking claws of
the motor band (right) into the main body,
position the fan motor, insert it, and then
secure the motor band (right) using the two
fixing screws.

U groove

– 80 –
 Revised-2

12-2. Microcomputer

No. Part name Procedure Remarks

 Common procedure 1) Turn the power supply off to stop the Replace terminal block,
operation of air-conditioner. microcomputer ass’y and the
2) Remove the front panel. P.C. board ass’y.
• Remove the 2 fixing screws.
3) Remove the electrical part base.

<P.C. board layout>

( RAS-M07, 10, 13 Series )

R02 CN31 CN33

R01

C01

FUSE

L01

C02

C03

IC12
CN51 C121 C133
T01

– 81 –
( RAS-M16 Series )

R05 L01 C01 CN23 FUSE R04 R01 CN10

DB01

C03

T01

IC01 C20 IC03 J04

– 82 –
 Revised-2

13. EXPLODED VIEWS AND PARTS LIST

13-1. Indoor Unit (1)

Location Part Location Part

Description Description
No. No. No. No.
201 43T21397 LOUVER MOTOR 214 43T39327 BEARING BASE
202 43T21371 FAN MOTOR 215 43T39328 MOTOR BAND (LEFT)
(FOR RAS-M16SKV-E,SKCV-E) 216 43T39329 MOTOR BAND (RIGHT)
202 43T21393 FAN MOTOR 217 43T09409 HORIZONTAL LOUVER
(FOR RAS-M07,10,13SKV-E,SKCV-E) 218 43T79313 DRAIN CAP
203 43T22312 MOLD BEARING ASSEMBLY 219 43T44409 REFRIGERANT CYCLE ASSEMBLY
204 43T70313 DRAIN HOSE (FOR RAS-M07,10,13SKV-E,SKCV-E)
205 43T20325 CROSS FLOW FAN ASSEMBLY 219 43T44410 REFRIGERANT CYCLE ASSEMBLY
206 43T11301 PIPE SHIELD (FOR RAS-M16SKV-E,SKCV-E)
(FOR RAS-M07,10,13SKV-E,SKCV-E) 221 43T00488 PANEL SERVICE ASSEMBLY
206 43T11320 PIPE SHIELD 222 43T80318 AIR FILTER (R)
(FOR RAS-M16SKV-E,SKCV-E) 223 43T80319 AIR FILTER (L)
207 43T83003 REMOTE CONTROL HOLDER 224 43T09410 GRILLE OF AIR INLET (ORIGINAL,WHITE)
208 43T60382 MOTOR CORD 226 43T62328 TERMINAL COVER
209 43T82310 INSTALLATION PLATE 227 43T69616 WIRELESS REMOTE CONTROL
211 43T19333 SENSOR FIX PLATE (FOR RAS-M10,13,16SKCV-E)
212 43T09408 PIPE HOLDER 227 43T69691 WIRELESS REMOTE CONTROL
213 43T03360 BACK BODY ASSEMBLY (FOR RAS-M07,10,13,16SKV-E)

– 83 –
 Revised-2

Indoor Unit (2)

407

403
405

402 401
404
406

Location Part Location Part

Description Description
No. No. No. No.
401 43T69319 TEMPERATURE SENSOR 407 43T69671 PC BOARD (FOR RAS-M16SKCV-E)
402 43T50306 TEMPERATURE SENSOR 407 43T69672 PC BOARD (FOR RAS-M10SKV-E)
403 43T60002 TERMINAL BLOCK; 3P 407 43T69673 PC BOARD (FOR RAS-M13SKV-E)
404 43T69320 TEMPERATURE SENSOR 407 43T69674 PC-BOARD (FOR RAS-M10SKCV-E)
405 43T62003 CORD CLAMP 407 43T69675 PC-BOARD (FOR RAS-M13SKCV-E)
406 43T69633 PC BOARD ASSY,WRS-LED 407 43T69826 PC-BOARD (FOR RAS-M07SKV-E)
407 43T69670 PC BOARD (FOR RAS-M16SKV-E)

– 84 –
 (THAILAND) CO.,LTD.
144/9 MOO 5, BANGKADI INDUSTRIAL PARK, TIVANON ROAD, TAMBOL BANGKADI,
AMPHUR MUANG, PATHUMTHANI 12000, THAILAND.