7-1 Outline of Air Conditioner Control
7-2 Description of Operation Circuit
7-3 Hi POWER Mode
7-4 High-Temperature Limit Control
7-5 Low-Temperature Limit Control
7-6 Defrosting Operation
7-7 Auto Restart Function
7-8 Filter Check Lamp
8. INSTALLATION PROCEDURE
8-1 Safety Cautions
8-2 Installation Diagram of Indoor and Outdoor Units
8-3 Installation
8-4 Indoor Unit
8-5 Outdoor unit
8-6 How to Set Remote Control Selector Switch
8-7 How to Use Drain Pump Kit of Option
8-8 Others
FILE NO. SVM-04031-(1)
– 1 –
Page 3
9. TROUBLESHOOTING CHART
9-1 Troubleshooting Procedure
9-2 Basic Check Items
9-3 Primary Judgement
9-4 Self-Diagnosis by Remote Control (Check Code)
9-5 How to Diagnose Faulty Parts
9-6 Troubleshooting for Indoor Unit
9-7 Troubleshooting for Wiring (Interconnect Cable and Serial Signal Wire)
9-8 Troubleshooting for P.C. Board
9-9 Troubleshooting for Remote Control
10. PARTS REPLACEMENT
10-1 Indoor Unit
10-2 Outdoor Unit (RAS-18UAH-ES3, RAS-18UA-ES3)
10-3 Outdoor Unit (RAS-24UAH-ES3, RAS-24UA-ES3)
11. EXPLODED VIEWS AND PARTS LIST
11-1 Indoor Unit (E-Parts Assy)
11-2 Indoor Unit
11-3 Outdoor Unit (RAS-18UAH-ES3)
11-4 Outdoor Unit (RAS-18UA-ES3)
11-5 Outdoor Unit (RAS-24UAH-ES3)
11-6 Outdoor Unit (RAS-24UA-ES3)
FILE NO. SVM-04031
• This air conditioner is charged with HFC (R-410A)
that does not deplete the Ozone layer.
• This air conditioner requires special service tools
for the refrigerant R-410A.
Over 15m up to 20m (20g/m) Over 15m up to 25m (30g/m)
JIS C9612-1994
CoolingHeating
(DB)27°C20°C
(WB)19°C12°C
(DB)35°C7°C
(WB)24°C6°C
– 4 –
Page 6
2-1. Indoor Unit
FILE NO. SVM-04031
2. CONSTRUCTION VIEWS
Front panel
1093
UNDER CEILING & CONSOLE INSTALLATION
208
633
Knock out system
Grille air inlet
Back Body
For stud bolt
(∅8 - ∅10)
For stud bolt (∅6)
200 Min
330165
∅74
1093
1015
742
450
2020
– 5 –
Installation plate
Mount plate
M10 Suspention bolt
633
460
70 Min
Wireless remote control
Knock out system
160
5718
Page 7
2-2. Outdoor Unit (RAS-18UAH-ES3)
10
-∅
8
11x14
∅
∅
anchor bolt
for
4x
600 or more
600
600 or
Air inlet
more
Liquid side
Electric
Parts cover
6.35)
∅
(Flare
12.7)
∅
Gas side
(Flare
FILE NO. SVM-04031-(1)
Installation dimension
120
Air inlet
325
100 or more
Air
outlet
100 or more
6 holes
-∅
8
10 anchor bolt)
— ∅
8
11x14 holes
∅
∅
(for fixing outdoor unit)
or
6-
25 Drain outlet
∅
Service Port
54
344
9
1
60
50
90
600
830
A
R10
600
50
35
Detail Drawing
A
52
325
23
6 hole
∅
11x14 hole
∅
Fan guard
Handle
420
∅
90
538
300
– 6 –
Page 8
2-3. Outdoor Unit (RAS-18UA-ES3)
10
-∅
8
11x14
∅
∅
or
anchor bolt
4x
600 or more
FILE NO. SVM-04031-(1)
600 or
325
more
100 or more
600
Air inlet
Installation dimension
Air inlet
100 or more
Air
outlet
Electric parts cover
6 hole
-∅
(for fixing outdoor unit)
8
6.35)
∅
Gas side
Liquid side
(Flare
27
12.7)
∅
(Flare
Service
Port
130
100
344
65.5
9090
120
A
600
Detail Drawing
A
50
R10
35
52.5
325
23
∅6 hole
301
325
11x14 hole
∅
4-∅11x14 hole
(for Ø8-Ø10 anchor bolt)
25Drain outlet
∅
420
∅
Fan guard
538
Handle
600
300
780
– 7 –
Page 9
2-4. Outdoor Unit (RAS-24UAH-ES3, RAS-24UA-ES3)
10
∅
8
12X18
∅
600
600 or
more
-∅
for
4
600 or
more
anchor bolt
Electric
Parts cover
Liquid side
6.35)
∅
(Flare
Gas side
2.7)
∅1
(Flare
FILE NO. SVM-04031-(1)
Service Port
1212
more
52
Air inlet
340
68
Installation dimension
100 or
25 Drain outlet
∅
120
Air outlet
100 or
more
140
600
310
23
Handle
340 (pitch)
88
74
880
364
A
600
Detail Drawing
A
50
63.8
340
27
12x18 hole
∅
340
690
Handle
– 8 –
Page 10
3. WIRING DIAGRAM
3-1. RAS-18UFHP-ES3 / RAS-18UAH-ES3
FILE NO. SVM-04031-(1)
COLOR IDENTIFICA TION
BR W: BROWN
RED: RED
WHI: WHITE
YEL: YELLOW
BLU: BLUE
BLK: BLACK
GR Y: GRA Y
PNK: PINK
ORN: ORANGE
GRN&YEL : GREEN&
GRN: GREEN
PUR: PURPLE
YELLOW
BLK
WHI
RED
GRN&YEL
CN30
CN31
BLK
CN23
P04
SG01
R22
FUSE
F01
250V AC
T6.3A
J401
2
111232 3
FOR FLOA T SWITCH
(OPTION)
When you use float
switch you should
cut J401
LOUVER
MOT OR
R09 R507
R21
CN402CN401CN11
IC04
C15
R Y401
R405
CR401
FOR DRAIN PUMP
(OPTION)
CN07
ORN
RED
PNK
YEL
BR W
BLU
L01
123
654
654
C501
321
321
MAIN PCB
MCC-865A
R Y501
5 3
5 311
BR W
GR Y
YEL
CN25
CN13
R01
C01
CR502
CR501
CN10BLK
WHI
1 1
RED
3 3
BLK
6 6
3 3
2 2
1 1
INFRARED RA YS RECEIVE
AND INDICA TION P AR TS
123
456
BLU
DB01
BLU
DC12V
DC5V
IC03
WHI
RED
456
BLU
456
456
C02
PUR
GR Y
BLU
BLU
789
7891010
BLU
BLU
789
7891010
BLU
123
BLU
123
123
R506
BLU
POWER SUPPLY
WHI
CIRCUIT
CN100
CN03
1 1
2 2
CN01
1 1
2 2
WHI
11
GRY
22
GRY
33
BLK
BLK
BLK
BLK
FAN
MOTOR
CN101
THERMO
SENSOR
(TA)
HEAT
EXCHANGER
SENSOR
(TC)
1
2
3
MCC-865B
SWITCH
PCB
OUTDOOR
TERMINAL
BLOCK
C
SR
COMPRESSOR TERMINAL
INDOOR
TERMINAL
BLOCK
POWER SUPPLY
220-240 V~ 50 Hz
L
N
FERRITE CORE
i
2
1
2
1
BLK
BLK
RED
RED
MAGNETIC
CONTACTOR
R
GRN&YEL
S
T
A1
52C
U
V
CAPACITORCAPACITOR
RED
S
WHI
PNK
C
R
COMPRESSOR
A2
W
BLK
RED
WHI
RE
3
3
CHASSIS
D
FAN MOTOR
INDOOR
UNIT
OUTDOOR
UNIT
GRN&YEL
BLK
TRANSFORMER
COIL FOR
4 WAY VALVE
BLK
BLK
RED
RED
BLK
BLK
WHI
RED
GRY
BLU
YEL
BLU
BLU
1
3
1
3
1
3
5
7
9
131
11
33
MAIN P.C. BOARD (MCC-890)
1
2
CN06
3
1
CN05
3
1
3
5
CN01
7
9
CN11
3
SG01
F01
250VAC T6. 3A
CR11
TNR
R74
CN02
CR12
CR13
BLK
1
1
CN03
RY07
RY05
3
TNR
R73
RY06
CN07
CN08
DISCHARGE
PIPE
SENSOR (TD)
BLU
1
1
2
3
3
BLU
BLK
1
1
2
3
3
BLK
HEA
T
EXCHANGER
SENSOR (TE)
− 9 −
Page 11
3-2. RAS-24UFHP-ES3 / RAS-24UAH-ES3
FILE NO. SVM-04031-(1)
COLOR IDENTIFICA TION
BR W: BROWN
RED: RED
WHI: WHITE
YEL: YELLOW
BLU: BLUE
BLK: BLACK
GR Y: GRA Y
PNK: PINK
ORN: ORANGE
GRN&YEL : GREEN&
GRN: GREEN
PUR: PURPLE
YELLOW
BLK
WHI
RED
GRN&YEL
CN30
CN31
BLK
CN23
P04
SG01
R22
F01
FUSE
T6.3A
250V AC
J401
2
111232 3
FOR FLOA T SWITCH
(OPTION)
When you use float
switch you should
cut J401
LOUVER
MOT OR
R09 R507
R21
CN402CN401CN11
IC04
C15
R Y401
R405
CR401
FOR DRAIN PUMP
(OPTION)
CN07
L01
123
ORN
RED
PNK
YEL
BR W
BLU
654
654
C501
321
321
MAIN PCB
MCC-865A
R Y501
5 3
5 311
BR W
GR Y
YEL
CN25
CN13
R01
C01
CR502
CR501
CN10BLK
WHI
1 1
RED
3 3
BLK
6 6
3 3
2 2
1 1
INFRARED RA YS RECEIVE
AND INDICA TION P AR TS
123
456
BLU
DB01
BLU
DC12V
DC5V
IC03
WHI
RED
456
BLU
456
456
C02
PUR
GR Y
BLU
BLU
789
7891010
BLU
BLU
789
7891010
BLU
123
BLU
123
123
R506
BLU
POWER SUPPLY
WHI
CIRCUIT
CN100
CN03
1 1
2 2
CN01
1 1
2 2
WHI
11
GR Y
22
GR Y
33
BLK
BLK
BLK
BLK
FAN
MOTOR
CN101
1
2
3
THERMO
SENSOR
(TA)
HEAT
EXCHANGER
SENSOR
(TC)
SWITCH
PCB
MCC-865B
OUTDOOR
TERMINAL
BLOCK
C
SR
COMPRESSOR TERMINAL
POWER SUPPLY
220-240 V~ 50 Hz
L
BLK
RED
BLK
(1/L1)
(2/T1)
CAPACITOR
RED
WHI
PNK
COMPRESSOR
INDOOR
TERMINAL
BLOCK
i
N
FERRITE CORE
RED
MAGNETIC
CONTACTOR
R
S
(3/L2)
(4/T2)
U
V
S
C
R
BLK
1
1
GRN&YEL
T
(5/L3)
(6/T3)
W
A1
52C
A2
2
3
2
3
CHASSIS
INDOOR
UNIT
OUTDOOR
UNIT
GRN&YEL
TRANSFORMER
BLK
BLK
RED
RED
BLK
BLK
WHI
RED
GRY
1
3
1
3
1
3
5
7
9
MAIN P.C. BOARD (MCC-890)
1
2
CN06
3
1
CN05
3
1
3
5
CN01
7
9
SG01
F01
250VAC T6. 3A
TNR
R74
TNR
R73
CN07
CN08
DISCHARGE
PIPE
SENSOR (TD)
BLU
1
1
2
3
3
BLU
BLK
1
1
2
3
3
BLK
HEA
T
EXCHANGER
SENSOR (TE)
RY07
BLU
131
CN11
3
RED
WHI
RE
CAPACITOR
D
BLK
YEL
BLU
BLU
COIL FOR
4 WAY VALVE
11
33
CN02
CR11
CR12
CR13
BLK
1
1
CN03
RY05
RY06
3
FAN MOTOR
− 10 −
Page 12
3-3. RAS-18UFP-ES3 / RAS-18UA-ES3
FILE NO. SVM-04031
CO LO R IDE NT IF IC ATIO N
BR W: B R OW N
R ED: R E D
WH I: WHI TE
YE L: YE LL OW
BL U: B LUE
BL K: B LA CK
GR Y: GR AY
PN K: PIN K
OR N: OR AN GE
GR N &YE L : GR E E N&
GR N: GR E E N
PU R: PU R PL E
YE L LOW
BL K
WH I
R ED
GR N &YE L
BL K
CN 30
CN 31
P0 4
CN 27
11
33
S G01
R 22
F0 1
FU S E
T6 .3A
250V AC
J4 01
2111232
CN 402C N401CN 11
FO R F LOAT S WI TC H
(OP T ION )
Whe n you us e float
switch you s hould
cut J 401
R 09 R5 07
R 21
CR 0 2
R Y0 4
LO UV ER
MOT OR
FO R DR AI N P UMP
IC 04
R Y40 1
R 405
CR 4 01
(OP T ION )
C1 5
OR N
R ED
PN K
YE L
BR W
BL U
654
L01
123
654
C5 01
321
321
MAI N P CB
MC C- 865A
R Y50 1
5 3
5 311
BR W
GR Y
YE L
BL K
CN 07
3
INF R AR E D R AY S R EC E IV E
AND IND IC ATIO N PA R TS
123
CN 25
123
BL U
BL U
123
CN 13
123
R 01
DB 01
C0 1
CR 5 02
DC 12V
DC 5V
CR 5 01
CN 10BL K
WH I
R ED
IC 03
R 506
1 1
3 3
6 6
3 3
2 2
1 1
BL U
WH I
R ED
C0 2
PU R
456
456
BL U
456
456
BL U
GR Y
BL U
789
7891010
BL U
BL U
789
7891010
BL U
BL U
WH I
CN 100
CN 101
S WIT CH
WH I
11
1
PC B
GR Y
22
2
GR Y
33
3
MC C-8 65B
P OWE R S U PP LY
C IR CU IT
CN 03
1 1
2 2
CN 01
1 1
2 2
BL K
BL K
BL K
BL K
FA N
MOT OR
TH ER M O
S EN S OR
(TA)
HE AT
E XC HAN GE R
S EN S OR
(T C)
OUTDOOR
TERMINAL
BLOCK
RED
WHI
PNK
POWER SUPPLY
220 − 240 V ~ 50 Hz
BLK
MAGNETIC
CONTACTOR
CAPACITOR
S
R
COMPRESSOR
INDOOR
TERMINAL
BLOCK
L
N
BLK
RED
GRN&YEL
RED
2
1
1
RED
3
2
3
BLK
BLK
GRN&YEL
CHASSIS
INDOOR
UNIT
OUTDOOR
UNIT
SPARK KILLER
GRY
R
U
T
S
V
(or A)
A1
(or B)
A2
W
CAPACITOR
RED
C
BLK
WHI
RED
BLK
FAN MOTOR
C
R
S
COMPRESSOR TERMINAL
− 11 −
Page 13
3-4. RAS-24UFP-ES3 / RAS-24UA-ES3
FILE NO. SVM-04031
COLOR IDENTIFICA TION
BR W: BROWN
RED: RED
WHI: WHITE
YEL: YELLOW
BLU: BLUE
BLK: BLACK
GR Y: GRA Y
PNK: PINK
ORN: ORANGE
GRN&YEL : GREEN&
GRN: GREEN
PUR: PURPLE
YELLOW
BLK
WHI
RED
GRN&YEL
BLK
CN30
CN31
CN27
P04
11
33
SG01
R22
F01
FUSE
T6.3A
250V AC
J401
2111232
CN402CN401CN11
FOR FLOA T SWITCH
(OPTION)
When you use float
switch you should
cut J401
R09 R507
R21
CR02
R Y04
LOUVER
MOT OR
FOR DRAIN PUMP
IC04
R Y401
R405
CR401
(OPTION)
ORN
RED
PNK
YEL
BR W
BLU
654
L01
123
654
C501
321
321
MAIN PCB
MCC-865A
R Y501
5 3
5 311
BR W
GR Y
YEL
BLK
CN07
C15
3
INFRARED RA YS RECEIVE
AND INDICA TION P AR TS
123
CN25
123
BLU
BLU
123
CN13
123
R01
DB01
C01
CR502
CR501
R506
CN10BLK
WHI
1 1
RED
3 3
6 6
3 3
2 2
1 1
BLU
DC12V
DC5V
IC03
WHI
RED
456
456
BLU
456
456
C02
PUR
GR Y
789
10
789
10
BLU
BLU
BLU
BLU
BLU
WHI
789
10
10
789
CN100
CN101
SWITCH
WHI
11
1
PCB
GR Y
22
2
GR Y
33
3
MCC-865B
POWER SUPPL Y
CIRCUIT
BLU
CN03
1 1
2 2
CN01
1 1
2 2
BLK
BLK
BLK
BLK
FA N
MOT OR
THERMO
SENSOR
(TA)
HEA T
EXCHANGER
SENSOR
(TC)
OUTDOOR
TERMINAL
BLOCK
INDOOR
TERMINAL
BLOCK
POWER SUPPLY
220 − 240 V ~ 50 Hz
L
N
BLK
BLK
RED
RED
MAGNETIC CONTACTOR
RED
BLKBLK
SPARK KILLER
A1A2
52C
RU
SV
TW
1
1
2
2
GRN&YEL
RED
CAPACITOR
3
3
GRY
CHASSIS
RED
RED
CAPACITOR
S
WHI
PNK
R
COMPRESSOR
INDOOR
UNIT
OUTDOOR
UNIT
WHI
RED
C
FAN MOTOR
BLK
COMPRESSOR TERMINAL
BLK
C
SR
− 12 −
Page 14
FILE NO. SVM-04031
4. SPECIFICATION OF ELECTRICAL PARTS
4-1. Indoor Unit
No.Parts nameTypeSpecifications
1Fan motor (for indoor)AFP-220-50-4AOutput (Rated) 50W, 220-240V
2Thermo sensor (TA-sensor)———10kΩ at 25°C
3DC-DC transformer (T01)SWT-47DC 390V, Secondary DC 12V, 7V
4MicrocomputerTMP87CM40AN
Note : Measure the heat exchanger temperature at the center of U-bend. (By means of TC sensor.)
*1 : During heating overload, the high temperature limit control operation is included.
– 16 –
Page 18
5-2. RAS-18UFP-ES3 / RAS-18UA-ES3
FILE NO. SVM-04031
0.39m
(Connecting pipe)
∅12.70 mm
0.39m
(Flexible pipe)
∅12.70 mm
O.D.:12.70 mm
Compressor
P
Packed valve
(∅12.70)
5KS225DAA
Indoor unit
Evaporator
Multi blade fan
Condenser
Propeller fan
Outdoor unit
T
0.49m
(Connecting pipe)
∅6.35 mm
O.D.:6.35 mm
Packed valve
(∅6.35)
Capillary tube
∅
1.7x600
S
Refrigerant
R-410A 1.14 Kg
Mark ( ) means check points of Gas Leak
Ambient temp.
conditions DB/WB
(°C)
IndoorOutdoor
50Hz
Standard
pressure P
(MPaG)
Surface temp. of heat
exchanger interchanging
pipe T (°C)
Fan speed
(indoor)
Standard0.910.0High27/1935/24
CoolingHigh temperature1.013.0High32/2343/26
Low temperature0.62.0Low21/1521/15
Note : Measure the heat exchanger temperature at the center of U-bend. (By means of TC sensor.)
Note : Measure the heat exchanger temperature at the center of U-bend. (By means of TC sensor.)
*1 : During heating overload, the high temperature limit control operation is included.
– 18 –
Page 20
5-4. RAS-24UFP-ES3 / RAS-24UA-ES3
FILE NO. SVM-04031
0.39m
(Connecting pipe)
∅12.70 mm
0.39m
(Flexible pipe)
∅12.70 mm
O.D.:12.70 mm
Cooling
Tank
Compressor
P
Packed valve
(∅12.70 )
5JS315DAG01
Indoor unit
Evaporator
Multi blade fan
T
0.49m
(Connecting pipe)
∅6.35 mm
O.D.:6.35 mm
Packed valve
(∅6.35)
Capillary tube
∅2.0x700S
Condenser
Refrigerant
R-410A 1.60 Kg
Fan speed
(indoor)
Ambient temp.
conditions DB/WB
(°C)
IndoorOutdoor
50Hz
Cooling
Propeller fan
Outdoor unit
Standard
pressure P
(MPaG)
Mark ( ) means check points of Gas Leak
Surface temp. of heat
exchanger interchanging
pipe T (°C)
Standard 0.9 6.0 High 27/19 35/24
Cooling High temperature 0.8 10.0 High 32/23 43/26
Low temperature 0.6 2.0 Low 21/15 21/15
Note : Measure the heat exchanger temperature at the center of U-bend. (By means of TC sensor.)
– 19 –
Page 21
6. CONTROL BLOCK DIAGRAM
6-1. RAS-18UFHP-ES3, RAS-24UFHP-ES3
Indoor Unit Control Panel
Heat Exchanger Sensor
Temperature Sensor
Functions
• Louver Control
• 3-minute Delay at Restart for Compressor
FILE NO. SVM-04031
8 MHzM.C.U.
Hi POWER
Display
FILTER Sign
Display
Infrared Rays Signal Receiver
Initiallizing Circuit
Infrared
Rays
36.7 kHz
Remote
Control
From Outdoor Unit
Clock Frequence
Oscillator Circuit
Power Supply
Circuit
Noise Filter
• Motor Revolution Control
• Processing
(Temperature Processing)
• Timer
• Drain Pump ON/OFF
• Serial Signal Communication
Serial Signal
Transmitter/
Receiver
Serial Signal Communication
Relay
RY401
Louver ON/OFF Signal
Louver Driver
PRE DEF.
Sign Display
TIMER
Display
OPERATION
Display
Indoor Fan
Motor
Louver Motor
Float
Switch
Drain
Pump
REMOTE CONTROL
Infrared Rays
Remote Control
Operation (START/STOP)
Operation Mode Selection
AUTO, COOL, DRY, HEAT, FAN ONLY
Temperature Setting
Fan Speed Selection
ON TIMER Setting
OFF TIMER Setting
Louver Auto Swing
Louver Direction Setting
ECO
Hi power
Filter Reset
– 20 –
Page 22
6-2. RAS-18UFP-ES3, RAS-24UFP-ES3
Indoor Unit Control Panel
Heat Exchanger Sensor
Temperature Sensor
Functions
• Louver Control
• 3-minute Delay at Restart for Compressor
FILE NO. SVM-04031
8 MHzM.C.U.
Hi POWER
Display
FILTER Sign
Display
Infrared Rays Signal Receiver
Initiallizing Circuit
Infrared
Rays
36.7 kHz
Remote
Control
From Outdoor Unit
Clock Frequency
Oscillator Circuit
Power Supply
Circuit
Noise Filter
• Motor Revolution Control
• Processing
(Temperature Processing)
• Timer
• Drain Pump ON/OFF
• Compressor ON/OFF
Driver
Relay
RY04
Compressor
Relay
RY401
Louver ON/OFF Signal
Louver Driver
FAN-ONLY
Sign Display
TIMER
Display
OPERATION
Display
Indoor Fan
Motor
Louver Motor
Float
Switch
Drain
Pump
REMOTE CONTROL
Infrared Rays
Remote Control
Operation (START/STOP)
Operation Mode Selection
AUTO, COOL, DRY, FAN ONLY
Temperature Setting
Fan Speed Selection
ON TIMER Setting
OFF TIMER Setting
Louver Auto Swing
Louver Direction Setting
ECO
Hi power
Filter Reset
– 21 –
Page 23
7. OPERATION DESCRIPTION
FILE NO. SVM-04031
7-1. Outline of Air Conditioner Control
This is a fixed capacity type air conditioner, which uses
a AC motor for an indoor fan. The AC motor drive
circuit is mounted in the indoor unit. And electrical
parts which operate the compressor and the outdoor
fan motor, are mounted in the outdoor unit.
The air conditioner is mainly controlled by the indoor
unit controller. The controller operates the indoor fan
motor based upon commands transmitted by the
remote control and transfers the operation commands
to the outdoor unit controller.
The outdoor unit controller receives operation
commands from the indoor unit, and operates the
outdoor fan motor and the compressor.
(1) Role of indoor unit controller
The indoor unit controller receives the operation
commands from the remote control and executes
them.
• Temperature measurement at air inlet of the
indoor unit by the indoor temperature sensor.
• Temperature setting of the indoor heat
exchanger by the heat exchanger sensor.
• Louver motor control.
• Indoor fan motor operation control.
• LED display control.
• Transferring of operation commands to the
outdoor unit.
• Receiving of information of the operation status
and judging of the information or indication of
error.
(2) Role of outdoor unit controller
The outdoor unit controller receives the operation
commands from the indoor controller and
executes them.
• Compressor operation
control
• Operation control of
outdoor fan motor
• Turning off the compressor and outdoor fan
when the outdoor unit receives the shutdown
command.
• Defrost control in heating operation
(Temperature measurement by the outdoor heat
exchanger and control for the four-way valve
and the outdoor fan motor.) Heating and Cooling
Model only.
Operations according
to the commands from
the indoor unit
7-1-1. Louver control
(1) Vertical air flow louver
Position of veritcal air flow louver is automatically
controlled according to the operation mode.
Besides, position of vertical air flow louver can be
arbitrarily set by pressing [FIX] button.
The louver position which is set by [FIX] button is
stored in the microcomputer, and the louver is
automatically set at the stored position for the next
operation.
(2) Swing
If [SWING] button is pressed when the indoor unit
is in operation, the vertical air flow louver starts
swinging. When [SWING] button is pressed, it
stops swinging.
7-1-2. Indoor fan control (AC Fan motor)
(1) The indoor fan is operated by the stepless speed
change AC motor.
(2) For air flow level, speed of the indoor fan motor is
controlled in five steps (LOW, LOW
+
, MED, MED
and HIGH). If AUTO mode is selected, the fan
motor speed is automatically controlled by the
difference between the preset temperature and
the room temperature.
Table 7-1-1
RAS-18UFHP-ES3 RAS-24UFHP-ES3
MODEL
CoolingHIGH10608001170900
andMED9006801000750
Fan onlyLOW800580850650
HeatingMED9507001020760
MODEL
CoolingHIGH10608001170900
andMED9006801000750
Fan onlyLOW800580850650
Motor speed Air flow level Motor speed Air flow level
(rpm)(m3/h)(rpm)(m3/h)
HIGH11208301210930
LOW850650860660
RAS-18UFP-ES3
LOW+=
LOW+MED
RAS-24UFP-ES3
2
MED+=
MED+HIGH
2
+
– 22 –
Page 24
FILE NO. SVM-04031
7-2. Description of Operation Circuit
(1) When turning on the breaker, the operation lamp
blinks. This means that the power is on (or the
power supply is cut off.)
(2) When pressing [START / STOP] button on the
remote control, receiving beep sounds from the
indoor unit, and the next operation is performed
together with opening the vertical air flow louver.
(3) Once the operation mode is set, it is memorized in
the microcontroller so that the previous operation
can be effected thereafter simply by pressing
[START / STOP] button.
7-2-1. Fan only operation
([MODE] button on the remote control is set
to the fan only operation.)
(1) When [FAN] button is set to AUTO, the indoor fan
motor operates as shown in Fig. 7-2-1. When
[FAN] button is set to LOW, LOW+, MED, MED+ or
HIGH, the motor operates with a constant air flow.
7-2-2. Cooling operation
([MODE] button on the remote control is set
to the cooling operation.)
(1) The compressor, 4-way valve, outdoor fan and
operation display on the remote control are
controlled as shown in Fig. 7-2-2.
ONON
OFF ON OFF OFF ON
Compressor
4-way valve
Common relay
(Preset temp.)
—
(Room temp.)
Preset
temp.
0.5
0
Fig. 7-2-2
display
Outdoor fan
OPERATION
+3
+2.5
(Preset temp.)
+2
—
+1.5
+1
+0.5
(Room temp.)
Preset
temp.
0
NOTE :
*1: The values marked with *1 are calculated and
controlled by the difference in motor speed
between M+ and L–.
Fig. 7-2-1 Setting of air flow [FAN:AUTO]
(2) ECO and Hi Power operation cannot be set.
M+
*1
*1
*1
L
(2) When [FAN] button is set to AUTO, the indoor fan
motor operates as shown in Fig. 7-2-3. When
[FAN] button is set to LOW, LOW+, MED, MED+ or
HIGH, the motor operates with a constant air flow.
—
Preset
temp.
+3
+2.5
(Preset temp.)
+2
—
+1.5
+1
+0.5
(Room temp.)
0
-0.5
M+
*1
*1
*1
L
—
NOTE :
*1: The values marked with *1 are calculated and
controlled by the difference in motor speed
between M+ and L–.
Fig. 7-2-3 Setting of air flow [FAN:AUTO]
– 23 –
Page 25
FILE NO. SVM-04031
(R
)
(P
)
7-2-3. Dry operation
([MODE] button on the remote control is set
to the dry operation.)
(1) The compressor, 4-way valve, outdoor fan and
operation display on the remote control are
controlled as shown in Fig. 7-2-4.
ON:6min.
OFF
ON:5min.
OFF
4-way valve
OFF:4min.
ON
OFF:5min.
Outdoor fan
(Preset temp.)
—
(Room temp.)
Preset
temp.
+3
+2
+1
ON:6min.
OFF:4min.
ON
ON:5min.
OFF:5min.
OFF
0
Compressor
Common relay
Fig. 7-2-4
(2) The microcontroller turns the compressor on and
off at the regular intervals (4 to 6 minutes). While
the compressor is turning off, the indoor fan motor
operates in the SUPER LOW position.
The pattern of operation depending on the relation
between room temperature and preset
temperatures is shown in Fig. 7-2-5.
Room temp.
Preset temp.+1
Preset temp.
7-2-4. Heating operation *Heating and cooling model only
([MODE] button on the remote control is set to
the heating operation.)
(1) The compressor, 4-way valve, outdoor fan and
operation display on the remote control are
controlled as shown in Fig. 7-2-6.
Preset
temp.
display
OPERATION
0
reset temp.
-0.5
—
oom temp.
ONON
OFF
ON
Compressor
Common relay
Fig. 7-2-6
(2) When [FAN] button is set to AUTO, the indoor fan
motor operates as shown in Fig. 7-2-7. When
[FAN] button is set to LOW, LOW+, MED, MED+ or
HIGH, the motor operates with a constant air flow.
Preset
temp.
0
-0.5
-1
-1.5
-2
(Preset temp.)
—
ON
OFF
ON
4-way valve
L
*1
*2
+
M
display
Outdoor fan
OPERATION
Compressor
Outdoor fan
Indoor fan
ONONONON
OFFOFFOFF
L.*S.L.S.L.L.L.S.L.L.
*
Super Low
Fig. 7-2-5
(3) [FAN] button on the remote control is set to AUTO
only.
(4) The ECO and Hi POWER operations can not be
set.
-5.0
-5.5
[FAN AUTO]
(Room temp.)
*1, *2 : The values marked with *1 and *2 are
calculated and controlled by the difference in
motor speed between M+ and L.
Fig. 7-2-7 Setting of air flow [FAN:AUTO]
– 24 –
H
Page 26
FILE NO. SVM-04031
(3) The indoor heat exchanger restricts revolving
speed of the fan motor to prevent a cold draft. The
upper limit of the revolving speed is sho wn in Fig.
7-2-8 and Table 7-2-1.
AUTO
34
46
33
45
21
33
20
32
*2
A + 4
A – 8
*6
A + 4
A – 8
*5
*4
SUL*3
SUL*1
Stop
Manual
(one of 5
steps)
L – H
(Up to
setting
speed)
NOTES :
*1: The fan stops for 2 minutes after thermostat-OFF.
*2: A is 24°C when the preset temperature is 24°C or
more and A is the preset temperature when it is
under 24°C.
*3: SUL means Super Ultra Low.
*4: Calculated from difference in motor speed
between SUL and HIGH.
Fig. 7-2-8 Cold draft preventing control
*5 and *6:
7-2-5. Automatic operation
([MODE] button on the remote control is set
to the automatic operation.)
(1) One of 3 operations (Cooling, Fan only or Heating)
is selected according to difference between the
preset temperature and the room temperature at
which the automatic operation has started, as
shown in Fig. 7-2-9. The Fan only operation
continues until the room temperature reaches a
level at which another mode is selected.
(2) Temporary Auto
When the TEMPORARY button on the indoor unit
is pushed, the preset temperature is fixed at 24°C
and the indoor unit is controlled as shown in
Fig. 7-2-9.
°C
Cooling operation
The louver moves to the position same
as Hi POWER operation.
• Up until 12 minutes
passed after starting
the unit
• From 12 to 25 minutes
passed after starting
the unit and room
temperature is 3°C
lower than preset
temperature
• Room temperature
<
Preset temperature
–4°C
Fig. 7-2-9
*6
Stabilized period
• From 12 to 25 minutes
passed after starting
the unit and room
temperature is between
preset temperature and
3°C lower than preset
temperature
• 25 minutes or more
passed after starting
the unit
• Room temperature
Preset temperature
–3.5°C
– 25 –
Page 27
FILE NO. SVM-04031
7-3. Hi POWER Mode
([Hi POWER] button on the remote
control 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
control 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 3°C.
(The value of the preset temperature on the
remote control does not change.)
• If the difference between the preset temperature
and the room temperature is big, the horizontal
louver moves to the Hi POWER position
automatically. Then when the difference
between them gets smaller, the horizontal
louver returns automatically.
• FAN speed : [AUTO]
If the difference between the preset temperature
and room temperature is big, the air conditioner
operates at maximum airflow level. If the
difference between the preset temperature and
the room temperature is small, the air
conditioner operates at normal airflow level.
• FAN speed : One of 5 levels
The air conditioner operates at normal airflow
level.
7-4. High-Temperature Limit Control
The microcontroller detects the indoor heat exchanger
temperature to prevent pressure of a refrigerating cycle
from increasing excessively.
The compressor and outdoor fan motor are controlled
as shown in Fig. 7-4-1.
Compressor
OFF
ON
ON
Outdoor fan
OFF
OFF
ON
Fig. 7-4-1
7-5. Low-Temperature Limit Control
The microcontroller detects the indoor heat exchanger
temperature to prevent the indoor heat exchanger from
freezing.
The compressor and outdoor fan motor are controlled
as shown in Fig. 7-5-1
Heat exchanger
temperature
6
2
Compressor
Less than 2 continues
Outdoor fan
ON
for 5 minutes
OFF
(3) Heating operation *Heating and Cooling Model
only
• The preset temperature increases 2°C,
(The value of the preset temperature on the
remote control does not change.)
• The indoor unit operates in normal heating
mode except the preset temperature is higher
(+2°C).
(4) The Hi POWER mode can not be set in Dry or Fan
only operation.
Fig. 7-5-1
7-6. Defrosting Operation
*Heating and Cooling Model only
When the indoor unit is in heating operation, if the
refrigerant evaporation temperature detected by the
outdoor heat exchanger sensor is under the specified
temperature, the outdoor unit starts the defrosting
operation. At this time, the 4-way valve relay and the
outdoor fan motor are turned off. The indoor fan motor
is also turned off by the cold draft preventing control of
the indoor microcomputer. Then, [PRE. DEF.] lamp on
the indoor unit comes on.
The defrosting operation stops and the 4-way valve
relay, outdoor fan motor and the indoor fan motor are
turned on automatically when the refrigerant
evaporation increases to the specified temperature, or
when the defrosting time is over 12 minutes.
– 26 –
Page 28
FILE NO. SVM-04031
PRE.DFILTERHi POWER
PRE.DFILTERHi POWER
7-7. Auto Restart Function
The 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 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.
7-7-1. How to set 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.
Push the [TEMPORARY] 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 on standby (Not operating)
OperationMotions
Push [TEMPORARY] button for moreThe unit is on standby.
than three seconds.
The unit starts to operate.The green lamp is on.
The unit beeps three timesThe lamp changes from
and continues to operate.green to orange.
If the unit is not required to operate at this time, push [TEMPORARY]
TEMPORARY
button
0
3S
→
→
button once more or use the remote control to turn it off.
After approx. three seconds,
When the unit is in operation
OperationMotions
Push [TEMPORARY] button for moreThe unit is in operation.The green lamp is on.
than three seconds.
The unit stops operating.The green lamp is turned off.
→
→
After approx. three seconds,
TEMPORARY
button
0
3S
The unit beeps three times.
If the unit is required to operate at this time, push [TEMPORARY]
button once more or use the remote control to turn it on.
• While this function is being set, if the unit is in
operation, the orange lamp is on.
• While the filter check lamp is on, the TEMPORARY
button has the function of filter reset button.
• This function can not be set if the timer operation
has been selected.
• When the unit is turned on by this function, the
louver will not swing even though it was swinging
automatically before shutting down.
– 27 –
Page 29
7-7-2. How to cancel auto restart function
PRE.DFILTERHi POWER
PRE.DFILTERHi POWER
To cancel auto restart function, proceed as follows:
Repeat the setting prodedure: the unit receives the
signal and beeps three times.
The unit will be required to be turned on with the
remote control after the main power supply is turned
off.
When the unit is on standby (Not operating)
OperationMotions
Push [TEMPORARY] button for moreThe unit is on standby.
→
than three seconds.
The unit starts to operate.The orange lamp is on.
→
FILE NO. SVM-04031
After approx. three seconds,
The unit beeps three timesThe lamp changes from
and continues to operate.orange to green.
If the unit is not required to operate at this time, push [TEMPORARY]
TEMPORARY
button
0
3S
button once more or use the remote control to turn it off.
When the unit is in operation
OperationMotions
Push [TEMPORARY] button for moreThe unit is in operation.The orange lamp is on.
→
than three seconds.
The unit stops operating.The orange lamp is turned off.
→
After approx. three seconds,
0
3S
TEMPORARY
button
• While this function is being set, if the unit is in
operation, the orange lamp is on.
7-7-3. Power failure during timer operation
When the unit is in Timer operation, if it is turned off
because of power failure, the timer operation is
cancelled. Therefore, set the timer operation again.
The unit beeps three times.
If the unit is required to operate at this time,
push [TEMPORARY]
button once more or use the remote control to turn it on.
7-8. Filter Check Lamp
When the elapsed time reaches 1000 hours, the filter
check lamp indicates. After cleaning the filters, turn off
the filter check lamp.
7-8-1. How to turn off filter check lamp
(1) Press [FILTER] button on the remote control.
(2) Push [TEMPORARY] button on the indoor unit.
Note:
If [TEMPORARY] button is pushed while the filter
check lamp is not indicating, the indoor unit will start
the Automatic Operation.
– 28 –
Page 30
FILE NO. SVM-04031
8. INSTALLATION PROCEDURE
8-1. Safety Cautions
For general public use
Power supply cord of Outdoor unit shall be more than 4 mm2 (H07RN-F or 245IEC66 : polychloroprene
sheathed flexible cord) or 3.5 mm2 (AWG-12).
CAUTION
• THIS AIR CONDITIONER USES THE NEW HFC REFRGERANT (R-410A), WHICH DOES NOT
DESTROY THE OZONE LAYER.
R-410A refrigerant is apt to be affected by impurity such as water, oxidizing membranes, and oils because
the pressure of R-410A refrigerant is approx. 1.6 times of refrigerant R-22. As well as the adoption of this
new refrigerant, refrigerating machine oil has also been changed. Therefore, during installation work, be sure
that water, dust, former refrigerant, or refrigerating machine oil does not enter into the refrigerating cycle of a
new-refrigerant air conditioner.
To avoid mixing refrigerant and refrigerating machine oil, the sizes of charging port connecting sections on
the main unit are different from those for the conventional refrigerant, and different size tools are also
required. Accordingly, special tools are required for the new refrigerant (R-410A) as shown below. For
connecting pipes, use new and clean piping materials with high-pressure withstand capabilities, designed for
R-410A only, and ensure that water or dust does not enter. Moreover, do not use any existing piping as its
pressure withstand may be insufficient, and may contain impurities.
CAUTION
This appliance must be connected to the main power supply by means of a circuit breaker or a switch with a
contact separation of at least 3 mm.
If this is not possible, a power supply plug with earth must be used. This plug must be easily accessible after
installation. The plug must be disconnected from the power supply socket in order to disconnect the
appliance completely from the mains.
New Refrigerant Air conditioner Installation
To Disconnect the Appliance from the Main Power Supply
– 29 –
Page 31
FILE NO. SVM-04031
DANGER
• FOR USE BY QUALIFIED PERSONS ONLY.
• TURN OFF MAIN POWER SUPPLY BEFORE ATTEMPTING ANY ELECTRICAL WORK. MAKE SURE
ALL POWER SWITCHES ARE OFF. FAILURE TO DO SO MAY CAUSE ELECTRIC SHOCK.
• CONNECT THE CONNECTING CABLE CORRECTLY. IF THE CONNECTING CABLE IS CONNECTED
WRONGLY, ELECTRIC PARTS MAY BE DAMAGED.
• CHECK THE EARTH WIRE THAT IT IS NOT BROKEN OR DISCONNECTED BEFORE INSTALLATION.
• DO NOT INSTALL NEAR CONCENTRATIONS OF COMBUSTIBLE GAS OR GAS VAPORS.
FAILURE TO FOLLOW THIS INSTRUCTION CAN RESULT IN FIRE OR EXPLOSION.
• TO PREVENT OVERHEATING THE INDOOR UNIT AND CAUSING A FIRE HAZARD, PLACE THE UNIT
WELL AWAY (MORE THAN 2 M) FROM HEAT SOURCES SUCH AS RADIATORS, HEATORS,
FURNACE, STOVES, ETC.
• WHEN MOVING THE AIR-CONDITIONER FOR INSTALLING IT IN ANOTHER PLACE AGAIN, BE VERY
CAREFUL NOT TO GET THE SPECIFIED REFRIGERANT (R-410A) WITH ANY OTHER GASEOUS
BODY INTO THE REFRIGERATION CYCLE. IF AIR OR ANY OTHER GAS IS MIXED IN THE
REFRIGERANT, THE GAS PRESSURE IN THE REFRIGERATION CYCLE BECOMES ABNORMALLY
HIGH AND IT RESULTINGLY CAUSES BURST OF THE PIPE AND INJURIES ON PERSONS.
• IN THE EVENT THAT THE REFRIGERANT GAS LEAKS OUT OF THE PIPE DURING THE
INSTALLATION WORK, IMMEDIATELY LET FRESH AIR INTO THE ROOM. IF THE REFRIGERANT GAS
IS HEATED BY FIRE OR SOMETHING ELSE, IT CAUSES GENERATION OF POISONOUS GAS.
WARNING
• Never modify this unit by removing any of the safety guards or bypassing 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.
• Before doing the electrical work, attach an approved plug to the power supply cord.
Also, make sure the equipment is properly earthed.
• Appliance shall be installed in accordance with national wiring regulations.
If you detect any damage, do not install the unit. Contact your TOSHIBA dealer immediately.
CAUTION
• Exposure of unit to water or other moisture before installation could result in electric shock.
Do not store it in a wet basement or expose to rain or water.
• After unpacking the unit, examine it carefully for possible damage.
• Do not install in a place that can increase the vibration of the unit. Do not install in a place that can amplify
the noise level of the unit or where noise and discharged air might disturb neighbors.
• To avoid personal injury, be careful when handling parts with sharp edges.
• Please read this installation manual carefully before installing the unit. It contains further important instruc-
tions for proper installation.
REQUIREMENT OF REPORT TO THE LOCAL POWER SUPPLIER
Please make absolutely sure that the installation of this appliance is reported to the local power supplier
before installation. If you experience any problems, or if the installation is not accepted by the supplier, the
service agency will take adequate countermeasures.
Remark per EMC Directive 89/336/EEC
To prevent flicker impressions during the start of the compressor (technical process) following installation
conditions do apply.
1. The power connection for the air conditioner has to be done at the main power distribution. This distribution
has to be of an impedance.
Normally the required impedance is reached at a 32A fusing point. Air conditioner fuse has to be 16A max.!
2. No other equipment should be connected to this power line.
3. For detailed installation acceptance, please contact your power supplier whether its restriction does apply
for products like washing machines, air conditioners or electrical ovens.
4. For power details of the air conditioner, refer to the rating plate of the product.
– 30 –
Page 32
FILE NO. SVM-04031-(1)
8-2. Installation Diagram of Indoor and Outdoor Units
For installation of the indoor unit, use the Paper pattern, which is inside the package box cover.
(Under Ceiling Installation)
200 mm or more
Before install the wireless
remote control
• With the remote control cover
open, load the batteries supplied
correctly, observing their polarity.
22
2 Wireless remote control
22
Cover
33
3 Batteries
33
Insulate the refrigerant
pipes separately with
insulation, not together.
70 mm or more
200 mm or more
2 Wireless remote
control
9 Pan head
wood screw
Pipe
shield
4 Remote control
holder
1 Installation
plate
200 m
or more
m
6 Zeolite filter
Air filter
(Console Installation)
70 mm or more
5 Filter frame
7 Bioenzyme filter
Hook
200 mm
or m
8
Mounting
screw
ore
6 mm thick heat resisting
polyethylene foam
Loop the connective cable
(about 100 mm in diameter and 300 – 350 mm long).
1
0
0
mm
or mo
r
e
more
r
o
mm
00
6
18 Class
Heat pump
m
or
m
m
0
10
600 mm or more
ore
Extension
drain hose
(Option:
RB–821SW)
Electric
parts
cover
6
0
0
mm
o
r
m
o
r
e
Cooling only
– 31 –
Vinyl tape Apply
after carrying out
a drainage test
Saddle
Extension
r more
m o
m
0
10
e
r
o
600 mm or more
1
0
0
mm
or mo
r
e
6
0
0
mm
o
r
m
o
re
r m
o
mm
600
drain hose
(Option:
RB–821SW)
Electric
parts cover
6
0
0
m
o
r
m
mo
r
e
24 Class18 Class
Loop the connective cable
(about 100 mm in diameter and 300 – 350 mm long).
Page 33
8-3. Installation
8-3-1. Optional installation parts
FILE NO. SVM-04031-(1)
Part
Code
Parts name
Refrigerant piping
Liquid side : ∅6.35 mm
A
Gas side: ∅12.70 mm
Pipe insulating material
B
(polyethylene foam, 6 mm thick)
Putty, PVC tapes
C
<Fixing bolt arrangement of outdoor unit>
RAS-18UAH-ES3, RAS-18UA-ES3
600 mm
52 mm
325 mm
Air inlet
120 mm
Q'ty
One
each
1
One
each
Air outlet
Drain outlet
Fig. 8-3-1
RAS-24UAH-ES3, RAS-24UA-ES3
600 mm
120 mm
120 mm
64 mm
340 mm
52 mm
Air outlet
Fig. 8-3-2
Air inlet
Drain outlet
RAS-18UA-ES3
325 mm
52 mm
600 mm
Air inlet
120 mm
Air outlet
Air outlet
Fig. 8-3-3
• Secure the outdoor unit with fixing bolts and nuts if the unit is likely to be exposed to a strong wind.
• Use ∅8 mm or ∅10 mm anchor bolts and nuts.
• If it is necessary to drain the defrost water, attach Drain nipple ! to the bottom plate of the outdoor unit
before installing it.
– 32 –
Page 34
8-3-2. Accessory and installation parts
FILE NO. SVM-04031
Part
No.
Part name (Q'ty)
1
Installation plate x 1
2
Wireless remote control x 1
3
Battery x 2
4
Remote control holder x 1
Part
No.
Part name (Q'ty)
5
Filter frame x 2
6
Zeolite filter x 1
7
Bioenzyme filter x 1
8
Mounting screw ∅4 x 25 s x 8
Part
No.
Part name (Q'ty)
9
Pan head wood screw
∅3.1 x 16 s x 2
!
Drain nipple x 1 (Packaged with
the outdoor unit)
"
Flexible pipe x 1
#
Pipe shield x 1
Others : Owner's manual, Installation manual
Option : For the Extension drain hose, use an optionally available RB-821SW or commercially available one.
This model is not equipped with an Extension drain hose.
– 33 –
Page 35
FILE NO. SVM-04031
8-3-3. Installation/Servicing tools
<Changes in the product and components>
In the case of an air conditioner using R-410A, 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
size of opposite side of flare nuts have been changed. (for copper pipes with nominal dimensions 1/2 and 5/8)
New tools for R-410AApplicable to R-22 modelChanges
Gauge manifoldAs pressure is high, it is impossible to measure by
Charge hoseIn order to increase pressure withstand strength,
Electronic balanceAs pressure is high and gasification speed is fast,
for refrigerant chargingit is difficult to read the indicated value by means
withstand
strength of the refrigerant piping, flare processing diameter and
means of conventional gauge. In order to prevent
any other refrigerant from being charged, each
port diameter has been changed.
hose materials 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.
of a charging cylinder, as air bubbles occur.
Torque wrench
(nominal dia. 1/2, 5/8)Incidentally, a common wrench is used for nominal
Flare toolBy increasing the clamp bar's receiving hole,
(clutch type)strength of spring in the tool has been improved.
Gauge for projectionUsed when flare is made with a conventional flare
adjustmenttool.
V acuum pump adapterConnected to conventional vacuum pump. It is
Gas leakage detectorExclusive for HFC refrigerant.
• Incidentally, the “refrigerant cylinder” comes with the refrigerant designation (R-410A) and protector coating in
the U. 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 port size of the charge hose.
—
The size of opposing flare nuts has been increased.
diameters 1/4 and 3/8.
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 for conventional refrigerant (7/16 UNF 20
threads per inch) and one for R-410A. If the
vacuum pump mineral oil mixes with R-410A, a
sludge may occur and damage the equipment.
– 34 –
Page 36
FILE NO. SVM-04031
8-4. Indoor Unit
8-4-1. Installation place
• A place which provides the spaces around the
indoor unit as shown in the above diagram.
• A place where there is no obstacle near the air inlet
and outlet.
• A place that allows easy installation of the piping to
the outdoor unit.
• A place which allows the Front panel to be opened.
CAUTION
• Direct sunlight or fluorescent light to the indoor
unit's wireless receiver should be avoided.
• The microprocessor in the indoor unit should not
be too close to RF noise sources.
(For details, see the owner's manual.)
<Remote control>
• A place where there are no obstacles such as a
curtain that may block the signal from the indoor
unit.
• Do not install the remote control in a place exposed
to direct sunlight or close to a heating source, such
as a stove.
• Keep the remote control at least 1 m apart from the
nearest TV set or stereo equipment. (This is
necessary to prevent image disturbances or noise
interference.)
• The location of the remote control should be
determined as shown below.
<Remote control usage>
• Under Ceiling Installation
Ceiling
Wall
5 m
Reception range
* Axial distance
Fig. 8-4-1
• Console Installation
Reception
Wall
range
7 m
Remote control
Reception range
5 m
*7 m
Remote control
7 m
Remote control
Floor
5 m
Reception range
* Axial distance
5 m
Remote control
Fig. 8-4-2
NOTICE
The Paper pattern is inside the package box cover.
Do not bend and dispose of it before installing.
– 36 –
*7 m
Page 37
FILE NO. SVM-04031
8-4-2. Before installation
<Remove the Air inlet grille>
1. Open the Air inlet grille with both hands.
2. Loosen three screws for fixing the Panel arm.
Do not remove the screws at this time.
1
2
1
Screw
2
Panel
arm
Fig. 8-4-3
3. First, move the Air inlet grille upward, then turn it
backwards.
4. Remove the Grille stopper from the axis of the Front
panel. After that, remove the Air inlet grille
5. Remove the Panel arms from the Front panel.
Panel arm
5
Grille stopper
3
3
8-4-3. After installation
<Install the Air inlet grille>
1. Insert the three Panel arms on the Air inlet grille and
fix each securely by screws.
Panel arm
Fig. 8-4-5
CAUTION
• The screws that fixed with Panel arms must not
be loose.
2. Set the Air inlet grille arm to the axis of the Front
panel.
3. Insert the Grille stopper to the correct position and
fix it securely with screws.
4. Push the Air inlet grille to the correct position.
Fig. 8-4-4
Air inlet
grille arm
Axis of the
Front panel
Rib
Fig. 8-4-6
– 35 –
Page 38
FILE NO. SVM-04031
8-4-4. Under ceiling installation
For the installation of the indoor unit, use the Paper
pattern, which is inside the package box cover.
<Install the Suspension bolts>
• Install the suspension bolts so that it can support
the indoor unit.
240 mm or more
1093
1015
140
330
60
235 mm
or more
Fig. 8-4-7
• Adjust distance to ceiling before installation.
25~30 mm
40~45 mm
Suspension
bolt
Washer
Nut (M10)
Spring
washer
<Install the indoor unit>
1. Remove the Side covers and the Installation plate
1.
2. Insert the Suspension bolts into the metal fittings of
the indoor unit.
3. Set to nuts, spring washers and washers on both
sides of the metal fittings and then move the indoor
unit backward.
4. Secure it with the M10 Nuts. (4pcs)
5. Attach the Side covers to the unit.
11
1 Installation plate
Suspension bolt
Side cover
3
2
4
Nut (M10)
11
Suspension bolt
Side cover
Fig. 8-4-9
Spring
washer
Fig. 8-4-8
Washer
Nut (M10)
Suspension
bolt (M10)
<Condition for installation>
• The unit must not decline more than 15 mm in either
axis.
15 mm
15 mm
Fig. 8-4-10
– 37 –
Page 39
FILE NO. SVM-04031
<Piping and Drain hose installation>
• The piping direction can be 4 ways as illustrated.
• The Drain hose is only one way.
Upper piping
Rear upper piping
Side piping
Rear piping Drain hose
Fig. 8-4-11
• How to install the Drain hose.
1. Remove the two screws and the Drain band.
2. Cut a slit for the drain hose hole.
Slit for drain hose hole
• Rear side piping with Drain hose. (Recommended
direction)
Ceiling
175 mm
or more
Rear piping hole ∅80
Ceiling
140 mm
Wall
Fig. 8-4-14
1. Cut or remove the determined direction slit or cover.
2. Pipes and the Drain hose should be fixed together
by the Drain band with two screws.
Cut
Drain band
Screws
Fig. 8-4-12
3. Place the Drain hose on the U- shape space and
secure it with the Drain band and two screws.
Fig. 8-4-13
Fig. 8-4-15
• Other direction piping.
1. Cut the slit of connecting only upper direction.
Slit for upper piping
Cover for rear
Cover for side piping
upper piping
Drain hose
Fig. 8-4-16
2. Connect the Flexible pipe " to the large pipe (Gas
side).
Big pipe
– 38 –
""
" Flexible pipe
""
Fig. 8-4-17
Page 40
FILE NO. SVM-04031
8-4-5. Console installation
• Select the terminal of Selector-SW from [C position] to
[F position].
B
F
INSTALL
REMOCON
A
C
Fig. 8-4-18
<Cutting a hole and mounting the installation plate>
• When installing the rear piping, determine the pipe
hole position, drill the pipe hole (∅80 mm) at a slight
downward slant to the outdoor side.
• For mounting of the Installation plate 1, use the Paper
pattern, which is inside the package box cover.
1093
742
375 mm
or more
<Install the indoor unit>
• Install the Installation plate 1 at the wall according to
the Paper pattern.
• Hang the indoor unit on the hooks of the Installation
plate 1.
• Fix the lower portion of the indoor unit with Mounting
screws 8 (2 places).
Indoor unit
Hook
11
1 Installation
11
plate
88
8 Mounting screw
88
160
390 mm
or more
320
Floor
140
Rear piping hole. ∅80
633
60
Fig. 8-4-19
Anchor bolt
Projection
5 mm dia. hole
Clip anchor
(local parts)
88
8 Mounting
88
screw
∅4 x 25
15 mm or less
ss
s
ss
Fig. 8-4-20
CAUTION
Failure to firmly install the unit may result in personal
injury and property damage if the unit falls.
88
8 Mounting screw
88
Fig. 8-4-21
<Condition for installation>
• The unit must not decline more than 15 mm in either
axis.
15 mm
Fig. 8-4-22
• In case of block, brick, concrete or similar type walls,
make 5 mm dia. holes in the wall.
• Insert clip anchors for appropriate Mounting screws 8.
NOTE:
• Secure four corners and lower parts of the Installation
plate 1 with 6 to 8 mounting screws to install it.
– 39 –
Page 41
FILE NO. SVM-04031
<Piping and Drain hose installation>
• The piping direction can be the following 3 ways with
the Drain hose.
• Each piping direction should be connected with the
Flexible pipe ".
Rear piping
Side piping
Bottom piping
Fig. 8-4-23
• Cut or remove the determined direction slit or cover.
Slit for upper piping
Cover for side piping
Cover for rear upper
piping
8-4-6. Wiring connection
<How to connect the connecting cable>
Terminal cover
Screws
Cord clamp
Earth terminal
Fig. 8-4-25
1. Remove the Terminal cover and the Cord clamp.
2. Insert the connecting cable into the pipe hole on the
wall.
3. Insert the connecting cable fully into the Terminal
block and secure it tightly with the screw.
Tightening torque: 1.2 N·m (0.12kgf·m)
4. Fix the connecting cable by the Cord clamp with two
screws.
5. Fix the Terminal cover.
<Stripping length of the connecting cable>
Fig. 8-4-24
10
10
40
50
Earth line
Fig. 8-4-26
NOTE:
Use strand wire only.
• Wire type : More than 1.5 mm2 (H07RN-F or 245
IEC66) or 1.3 mm2 (AWG-16)
Fig. 8-4-27
NOTE:
Connect the earth line to the metallic part (i mark)
located at the side of 3P terminal.
– 40 –
Page 42
FILE NO. SVM-04031
8-4-7. Pipe shield for flare nut connection
Joints in liquid and gas pipes of the indoor unit should
be insulated with an attached Pipe shield #.
<How to install the Pipe shield>
1. Cut the Pipe shield # to appropriate length.
2. Set the Pipe shield #.
3. In case of a ceiling installation, orient the slit at the
top of the pipe.
4. Fix the Pipe shield # with vinyl tape.
Vinyl tape
##
# Pipe shield
##
Slit
Fig. 8-4-28
8-4-8. Drainage
1. Run the Drain hose sloping downward.
NOTE:
• The hole should be made at a slight downward slant
on the outdoor side.
Under Ceiling InstallationConsole Installation
50 mm
or more
50 mm
or more
Fig. 8-4-29
NOTICE
In the case of upward drainage from the unit,
(Under Ceiling Installation), it is necessary to use
Drain pump kit of optional part.
CAUTION
1. Do not raise the Drain hose.
2. Do not put the Drain hose into water.
3. Do not form the Drain hose into a wave shape.
4. Do not put the Drain hose end in the drainage
ditch.
2. Open the louver manually and put some water into it.
Then check the flow of water from the Drain hose.
Fig. 8-4-30
3. When connecting the Extension drain hose, insulate
the connecting part of Extension drain hose with the
Pipe shield.
Pipe Shield
Drain hose
Inside the room
Extension drain hose
Fig. 8-4-31
CAUTION
Arrange the drain pipe for proper drainage from the
unit.
Improper drainage can result in dew-dropping.
(Provided by customer)
– 41 –
Page 43
FILE NO. SVM-04031
8-5. Outdoor Unit
8-5-1. Installation place
• A place which provides the spaces around the
outdoor unit as shown in the left diagram.
• A place which can bear the weight of the outdoor
unit and does not allow an increase in noise level
and vibration.
• A place where the operation noise and discharged
air do not disturb your neighbors.
• A place which is not exposed to a strong wind.
• A place free of a leakage of combustible gases.
• A place which does not block a passage.
• When the outdoor unit is to be installed in an
elevated position, be sure to secure its feet.
• An allowable length of the connecting pipe is up to
15 m (Refer to the table of TO CHARGEREFRIGERANT for detail.)
• An allowable height level is up to 8 m.
• A place where the drain water does not raise any
problem.
CAUTION
1. Install the outdoor unit without anything
blocking the air discharging.
2. When the outdoor unit is installed in a place
always exposed to strong wind like a coast or on
a high storey of a building, secure the normal fan
operation using a duct or a wind shield.
3. Especially in windy area, install the unit to
prevent the admission of wind.
4. Installation in the following places may result in
trouble.
Do not install the unit in such places.
• A place full of machine oil.
• A saline-place such as the coast.
• A place full of sulfide gas.
• A place where high-frequency waves are likely
to be generated as from audio equipment,
welders, and medical equipment.
8-5-2. Refrigerant piping connection
1. Cut the pipe with a pipe cutter.
90°
Obliquity
Roughness
Fig. 8-5-2
2. Insert a flare nut into the pipe, and flare the pipe.
A
Die
Pipe
Fig. 8-5-3
Projection margin in flaring : A (Unit : mm)
Outer dia.
of copper pipe
6.35
12.70
Rigid
1.0 to 1.5
1.0 to 1.5
A
Imperial
1.5 to 2.0
2.0 to 2.5
Warp
Strong
wind
Fig. 8-5-1
– 42 –
Page 44
FILE NO. SVM-04031
<Tightening connection>
Align the centers of the connecting pipes and tighten
the flare nut as far as possible with your fingers. Then
tighten the nut with a spanner and torque wrench as
shown in the figure.
CAUTION
• Do not apply excess torque, otherwise the nut
may crack depending on the conditions.
(Unit : N·m)
Outer dia.
of copper pipe
∅6.35 mm
∅12.70 mm
• Tightening torque of flare pipe connections
The operating pressure of R-410A is higher than that
of R-22 (Approx. 1.6 times). It is therefore necessary to
tighten firmly flare pipe connecting sections (which
connect the indoor and outdoor units) up to the
specified tightening torque. Incorrect connections may
not only cause a gas leakage, but also damage the
refrigerant cycle.
Fig. 8-5-4
Half union
Externally
threaded side
Use a wrench to secure.
Tightening torque
16 to 18 (1.6 to 1.8 kgf·m)
50 to 62 (5.0 to 6.2 kgf·m)
Flare at
outdoor unit side
Flare nut
Internally
threaded side
Use a torque wrench to tighten.
8-5-3. Evacuating
After the piping has been connected to the indoor unit,
you can perform the air purge together at once.
AIR PURGE
Evacuate the air in the connecting pipes and in
the indoor unit using vacuum pump. Do not use the
refrigerant in the outdoor unit.
For details, see the manual of the vacuum pump.
<Using a vacuum pump>
Be sure to use a vacuum pump with counter-flow
prevention function so that inside oil of the pump does
not flow backward into pipes of the air conditioner
when the pump stops. (If inside oil of the vacuum pump
enters into the air conditioner which adopts R-410A, a
trouble of the refrigeration cycle may be caused.)
1. Connect the charge hose from the manifold valve to
the service port of the gas side packed valve.
2. Connect the charge hose to the port of the vacuum
pump.
3. Open fully the low pressure side handle of the
gauge manifold valve.
4. Operate the vacuum pump to start for evacuating.
Perform evacuating for about 15 minutes if the
piping length is 20 meters. (15 minutes for 20
meters) (Assuming a pump capacity of 27 liters per
minute.) Then confirm that the compound pressure
gauge reading is –101 kPa (–76 cmHg).
5. Close the low pressure side valve handle of gauge
manifold.
6. Open fully the valve stem of the packed valves (both
sides of Gas and Liquid).
7. Remove the charging hose from the service port.
8. Securely tighten the caps on the packed valves.
Compound pressure gauge
-101kPa (-76cmHg)
Handle Lo
Charge hose
(For R-410A only)
Pressure gauge
Manifold valve
Handle Hi
(Keep full closed)
Charge hose
(For R-410A only)
Fig. 8-5-5
CAUTION
• KEEP IMPORTANT 4 POINTS FOR PIPING
WORK
(1) Take away dust and moisture (Inside of the
connecting pipes).
(2) Tight connection (between pipes and unit).
(3) Evacuate the air in the connecting pipes using
VACUUM PUMP.
(4) Check gas leak (connected points).
– 43 –
Connecting pipe
Vacuum pump
adapter for
counter-flow
prevention
(For R-410A only)
Vacuum
pump
Packed valve at gas side
Service port
(Valve core (Setting pin))
Packed valve at liquid side
Fig. 8-5-6
Page 45
FILE NO. SVM-04031-(1)
TO CHARGE REFRIGERANT
No need to charge
refrigerant
Need to charge
refrigerant
RAS-18UFHP-ES3 / 18UAH-ES3
RAS-18UFP-ES3 / 18UA-ES3
15 m or less
Over 15 m up to
20 m (20g/m)
RAS-24UFHP-ES3 / 24UAH-ES3
RAS-24UFP-ES3 / 24UA-ES3
15 m or less
Over 15 m up to
25 m (20g/m)
<Packed valve handling precautions>
• Open the valve stem all the way out; but do not try to
open it beyond the stopper.
• Securely tighten the valve stem cap with torque in
the following table:
Pipe sideATightening torque
Gas side
(∅12.70 mm)
Liquid side
(∅6.35 mm)
Service port
50 to 62 N·m
(5.0 to 6.2 kgf·m)
16 to 18 N·m
(1.6 to 1.8 kgf·m)
9 to 10 N·m
(0.9 to 1.0 kgf·m)
4 mm
Same as
Gas side
• Hexagonal wrench : A (Unit : mm)
Hexagonal wrench
is required.
A
<Stripping length of connecting cable>
Terminal block
LN132
Terminal
screw
Cord clamp
Power supply cord
Earth line
Screw
Cord clamp
Connecting cable
Fig. 8-5-8
L
N
10
10
60
Power supply cord
70
Earth line
123
10
10
60
Connecting cable
Fig. 8-5-9
Power source
Maximum running
current
Plug socket &
fuse rating
Power cord
RAS-18UFHP-ES3 / 18UAH-ES3
RAS-18UFP-ES3 / 18UA-ES3
50 Hz, 220 – 240 V Single phase
16A18A
4 mm2 (H07RN-F or 245 IEC 66) or 3.5 mm
(AWG-12)
RAS-24UFHP-ES3 / 24UAH-ES3
RAS-24UFP-ES3 / 24UA-ES3
20A
70
2
Fig. 8-5-7
8-5-4. Wiring connection
1. Remove the electric parts cover from the outdoor
unit.
2. Connect the connecting cable to the terminal as
identified with their respective matched numbers on
the terminal block of indoor and outdoor unit.
3. When connecting the connecting cable to the
outdoor unit terminal, make a loop as shown in the
installation diagram of indoor and outdoor unit, to
prevent water coming in the outdoor unit.
4. Insulate the unused cords (conductors) from any
water coming in the outdoor unit. Proceed them so
that they do not touch any electrical or metal parts.
CAUTION
• Wrong wiring connection may cause some
electrical parts burn out.
• Be sure to comply with local codes on running
the wire from indoor unit to outdoor unit (size of
wire and wiring method etc).
• Every wire must be connected firmly.
NOTE: Connecting cable
• Wire type : More than 1.5 mm2 (H07RN-F or 245
IEC66) or 1.3 mm2 (AWG-16)
– 44 –
Page 46
FILE NO. SVM-04031
8-6. How to Set Remote Control Selector
Switch
When two indoor units ae installed in seperated rooms,
there is no need to change the selector switch.
<Remote control selector switch>
• When two indoor units are installed in the same
room or the adjacent two rooms, they may be
controlled simultaneously with a single remote
control. To prevent this, set either unit and its remote
control to B setting. (Both units are set to A setting
before shipment.)
• The remote control signal is not recived when the
indoor unit setting is different from the remote
control one.
1. Set the remote control selector switch with the
indoor unit.
1) Turn the circuit breaker of the main power switch off
before setting the selector switch.
2) Remove the Air inlet grille. (Refer to page 35, 8-4-2)
2. Set the remote control selector switch with the
remote control
[B] is indicated on the liquid crystal display when
setting remote control selector switch to B. [A] is not
indicated on the display even if the selector switch
is set to A.
1) Load the remote control with the batteries.
2) Press the [CHECK] button using something with
sharp point. (The preset temperature on the remote
control changes to [00].)
3) Press the [MODE] button while pressing the
[CHECK] button, [B] is indicted at the right of the
present temperature display.
• To reset the switch to the [A] setting, press the
[MODE] button again while pressing the [CHECK]
button.
A
B
AB
Fig. 8-6-1
3) Select the terminal of selector switch from [A
position] to [B position].
C
A
REMOCON
INSTALL
F
B
Fig. 8-6-2
PRESET
START/STOP
ECO
AUTO
Hi-POWER
MEMO
CLOCK CHECKRESET
[MODE] button
FANMODE
SWING
TIMER
FIX
ON
OFFSETCLR
FILTER
[CHECK] button
Fig. 8-6-3
3. Confirm that the indoor unit can operate with the
new setting.
– 45 –
Page 47
FILE NO. SVM-04031
PRE.DFILTERHi POWER
8-7. How to Use Drain Pump Kit of Option
In the case of upward drainage from the unit (Under
ceiling installation). It is necessary to use Drain pump
kit of option parts. By using a Drain pump kit, it
becomes possible to raise 300 mm from a ceiling side.
Please follow the installation manual of Drain pump kit
(TCB-DP10CE) attachment.
300 mm
Drain pump kit
Fig. 8-7-1
8-8. Others
8-8-1. Gas leak test
Electric parts cover
Flare nut connections
(Outdoor unit)
D
B
Valve stem cap connection
Fig. 8-8-1
• Check the flare nut connections, valve stem cap
connections and service port cap connections for
gas leak with a leak detector or soap water.
8-8-2. Test operation
To switch the TEST RUN (COOL) mode, press
TEMPORARY b utton for 10 sec.
(The beeper will make a short beep.)
C
Flare nut connections
(Indoor unit)
Valve stem cap
connection
A
Service cap connection
TEMPORARY
button
Fig. 8-8-2
8-8-3. Auto restart setting
This product is designed so that, after a power failure,
it can restart automatically in the same operating mode
as before the power failure.
Information
The product was shipped with Auto Restart function
in the off position. Turn it on as required.
<How to set the auto restart>
• Press and hold the TEMPORARY button for about 3
seconds. After 3 seconds, the electronic beeper
makes three short beeps to tell you the Auto Restart
has been selected.
• To cancel the Auto Restart, follow the steps
described in the section Auto Restart Function of
the Owner’s Manual.
– 46 –
Page 48
9. TROUBLESHOOTING CHART
FILE NO. SVM-04031
9-1. Troubleshooting Procedure
9-2-2. Incorrect cable connection between indoor
and outdoor units
Follow the details of 9-2. Basic Check Items.
If there is no trouble corresponding to 9-2, check
whether or not there are faulty parts following
9-4. Self-Diagnosis by Remote Control.
The indoor unit is connected to the outdoor unit with 4
cables. Check that the indoor and outdoor units have
been properly connected with terminals assigned the
same numbers. If the connectors are not properly
9-2. Basic Check Items
connected, the outdoor unit will not operate normally,
or OPERATION lamp and TIMER lamp will blink (5Hz).
9-2-1. Power supply voltage
The line voltage must be AC 220 – 240V. If it is not
within this range, the air conditioner may not operate
normally.
9-2-3. Program control
The microcomputer operates as shown in Table 9-2-1
to control the air conditioner. If there are any operational problems, check whether or not the problems
correspond to Table 9-2-1. If they correspond to the
Table, they are not problems with the air conditioner,
but they are indispensable operations to control and
maintain the air conditioner properly.
Table 9-2-1
No.Operation of Air ConditionerDescriptions
1When the main power supply is turned on,
the OPERATION lamp on the indoor unit
blinks.
The OPERATION lamp blinks to indicate that power is turned on.
If the [START/STOP] b utton is pressed, the lamp stops blinking.
2The indoor fan motor speed does not change
in the Dry operation.
3The compressor is not turned off even though
the room temperature is in the range that the
compressor is turned off.
4The compressor is not turned on and off even
though the thermo control is operated in the
Dry operation.
5The PRE-DEF. lamp is indicated when the
Heating operation starts.
6The outdoor fan motor stops in the Heating
operation.
7The compressor is not turned on even though
the room temperature is in the range that the
compressor is turned on.
8The operation mode changes in the Auto-
matic operation.
9The Fan only operation continues in the
Automatic operation.
The indoor fan motor speed is automatically controlled in the Dry
operation.
The compressor has a function that it is not turned off for
3 minutes after it is turned on even though the room temperature
is in the range that the compressor is turned off.
In the Dry operation, the compressor is turned on and off
automatically at the regular intervals, independent of the thermo
control.
The PRE-DEF. lamp is indicated during the Defrosting
operation or if the indoor heat exchanger temperature is low when
the Heating operation starts. At this time, the indoor fan motor
stops to prevent cold air from blowing in the room.
When the indoor heat exchanger temperature is high, the outdoor
fan motor is stopped by the high-temperature limit control
operation.
The compressor is not turned on in the restart delay timer
(3-minutes timer) operation. It is also not turned on after the power
supply is turned on because of this timer operation.
In Automatic operation, the room temperature is detacted every
15 minutes and the operation mode is changed according to
difference between the room temperature and the preset
temperature.
When the room temperature is in the range (Preset temperature
± 1°C), the Fan only operation is selected.
10The Hi-POWER operation does not work.
This operation does not work when the unit is in the Dry operation
or Fan only operation.
– 47 –
Page 49
FILE NO. SVM-04031
9-3. Primary Judgement
9-3-1. Role of indoor unit controller
The indoor unit controller receives the operation
commands from the remote control and executes
them.
• Temperature measurement at the air outlet of the
indoor heat exchanger by the indoor temperature
sensor
• Temperature setting of the indoor heat exchanger by
the heat exchanger sensor
• Louver motor control
• Indoor fan motor operation control
• LED display control
• Transferring of operation commands to the outdoor
unit
Table 9-3-1
LampsSelf-diagnosis
AOPERATION lamp is blinking. (1Hz)
BOPERATION lamp is blinking. (5Hz)
COPERATION lamp is blinking. (5Hz)
DOPERATION lamp is blinking. (5Hz)
EOPERATION lamp is blinking. (5Hz)
FOPERATION and TIMER lamps are blinking.
(5Hz)
9-3-2. Failure diagnosis
The indoor unit diagnoses the operation condition and
indicates the information of the self-diagnosis with the
lamps on the display panel of the indoor unit.
Power failure (when the power supply is turning on)
Thermo sensor (TA) short or break
Heat exchanger sensor (TC) short or break
Indoor fan motor lock or failure
Indoor P.C. board failure
Wrong wiring of connecting cable
GOPERATION, TIMER and PRE-DEF.
(or FAN ONLY or cooling only model) lamps
are blinking.
HOPERATION, TIMER and PRE-DEF.
(or FAN ONLY or cooling only model) lamps
are blinking.
Table 9-3-2 Diagnosis by detective operation
SymptomCheckPrimary judgement
The remote control
does not work.
The outdoor fan
does not rotate.
Turn off the power supply once,
then turn it on. Try to operate
the remote control.
The compressor operates.
The compressor does not
operate.
• Gas shortage or other refrigerant cycle trouble
• Heat exchanger sensor open, break or short
• Overload relay or thermostat trouble of compressor
Cycle failure
The remote control
still does not work.
The remote control
works.
The indoor unit (and/or remote
control) is/are defective .
OK.
The outdoor unit (Outdoor fan
motor) is defective.
An internal part of the
compressor is defective.
– 48 –
Page 50
9-4. Self-Diagnosis by Remote Control
(Check Code)
(1) If the lamps are indicated as shown B to H in Table
9-3-1, exchanger the self-diagnosis by the remote
control.
(2) When the remote control is set to the service
mode, the indoor controller diagnoses the operation condition and indicate the information of the
self-diagnosis on the display of the remote control
with the check codes. If a fault is detected, all
lamps on the indoor unit will blink at 5Hz and it will
beep for 10 seconds (Pi, Pi, Pi....). The timer lamp
usually blinks (5Hz) during the self-diagnosis.
9-4-1. How to use Remote control in service mode
SETCLR
CLOCK CHECKRESET
FILE NO. SVM-04031
(1) Press [CHECK] button with a tip of pencil to set the
remote control to the service mode.
• “00” is indicated on the display of the remote
control.
• The timer lamp on the indoor unit blinks continu
ously. (5 times per 1 sec.)
AUTOA
AB
PRESET
START/STOP
ECO
AUTO
Hi-POWER
MEMO
CLOCK CHECKRESET
FANMODE
SWING
TIMER
FIX
ON
OFFSETCLR
FILTER
• Alphanumeric characters are used for the check code.
(2) Press [TIMER 8] button.
If there is no fault with a code, the indoor unit will
beep once (Pi) and the display of the remote
control will change as follows:
; 00 ; 01 ; 02 ··· 1d ; 1E ; 22
• Check the unit with all 35 check codes (00 to 22).
as shown in Table 9-4-1.
• Press [TIMER 9] button to change the check
code backwards.
If there is a fault, the indoor unit will beep for 10
seconds (Pi, Pi, Pi...).
Note the check code on the display of the remote
control.
• 2-digits alphanumeric will be indicated on the
display.
• All lamps on the indoor unit will blink. (5 times
per 1 sec.)
(3) Press [CLR] button. After service finish for clear
service code in memory.
• “7F” is indicated on the display of the remote
control.
is 5.is 6.
is A.is B.
is C.is D.
(4) Press [START/STOP] button to release the service
mode.
• The display of the remote control returns to as it
was before service mode was engaged.
– 49 −
Page 51
Table 9-4-1
Block levelDiagnosis function
Check
codecodestatus
Block
Indoor
P.C. board
Cable
connection
Outdoor
P.C. board
Other parts
(including
compressor)
Check
Symptom
The indoor thermo sensor (TA) is
defective.
Disconnection or short-circuit
The indoor heat exchanger
sensor (TC) is defective.
Disconnection or short-circuit
The indoor fan motor or its circuit
is defective.
The part other than the above
parts on the indoor P.C. board is
defective.
EEPROM access error
IOL operation
The serial signals can not be
transmitted and received between
indoor and outdoor units.
• The crossover wire is
connected wrongly.
• The serial signal transmitting
circuit on the outdoor P.C. board
is defective.
• The serial signal receiving
circuit on the indoor P.C. board
is defective.
The operation command signals
are not transmitted from the
indoor unit to the outdoor unit.
The outdoor thermo sensor (TE)
is defective.
Disconnection or short-circuit
The outdoor heat exchanger (TD)
sensor is defective.
Disconnection or short-circuit
The reply serial signal has been
transmitted when starting the
unit, but stops being transmitted
shortly after.
1. Compressor thermo operation
• Gas shortage
• Gas leak
2. Instantaneous power failure
The discharge temperature is
over 120°C.
The IOL operation is defective.
Unit
Operation
continues.
Operation
continues.
All off
Operation
continues.
All off
Operation
continues.
Operation
continues.
All off
All off
Operation
continues
.
All off
All off
Condition
The lamp on the
indoor unit blinks
when error is
defected.
The lamp on the
indoor unit blinks
when error is
defected.
The lamp on the
indoor unit blinks
when error is
defected.
The lamp on the
indoor unit blinks
when error is
defected.
The lamp on the
indoor unit blinks
when error is
defected.
The lamp on the
indoor unit blinks
when error is
defected.
The lamp on the
indoor unit blinks
when error is
defected. And it
returns to the
normal condition
when recovering
from errors.
The lamp on the
indoor unit blinks
when error is
defected.
The lamp on the
indoor unit blinks
when error is
defected.
The lamp on the
indoor unit blinks
when error is
defected. And it
returns to the
normal condition
when recovering
from errors.
The lamp on the
indoor unit blinks
when error is
defected.
The lamp on the
indoor unit blinks
when error is
detected.
FILE NO. SVM-04031-(1)
Judgement and action
1. Check the indoor thermo sensor (TA).
2. Check the indoor P.C. board.
1. Check the indoor heat exchanger
sensor (TC).
2. Check the indoor P.C. board.
1. Check the connector circuit of the
indoor fan motor (CN10).
2. Check the indoor fan motor.
3. Check the indoor P.C. board.
1. Check the indoor P.C. board.
(EEPROM and peripheral circuits)
Overload operation of refrigerating cycle
1. In the case of the outdoor unit not
operating at all;
• Check the crossover cable and
connect it properly.
•
Check the outdoor P.C. board.
2. In the case of the outdoor unit operating
normally;
• Check whether or not both of serial
LED (Green) and serial LED (Orange)
is blinking.
If the serial LED (Green) is not
blinking, check the outdoor P.C. board.
If the serial LED (Orange) is not
blinking, check the indoor P.C. board.
If the operation command signals continue
to be transmitted between 2 and 3 of the
indoor terminal block, replace the outdoor
P.C. board.
1. Check the outdoor thermo sensor (TE).
2. Check the outdoor P.C. board.
1. Check the outdoor heat exchanger
sensor (TD).
2. Check the outdoor P.C. board.
1. Repeatedly turn the indoor unit on and
off with the interval of approx. 10 to 40
minutes. (The check code is not
indicated during operation.) And supply
gas. (Check gas leak.)
2. The indoor unit operates normally
during the check.
If the reply serial signal continues to be
transmitted between 2 and 3 of the
indoor terminal block, replace the
outdoor P.C. board.
If the signal stops between them,
replace the indoor P.C. board.
1. Check the heat exchanger sensor (TD).
2. Gas purging
When turning on the unit, the normal
phase (RST) is detected but T-R waveform
has not been detected for 120 seconds or
more.
− 50 −
Page 52
9-5. How to Diagnose Faulty Parts
Operation
Measure
Item by symptoms
Check item
Conceivable principle
cause
[04 Serial signal error]
FILE NO. SVM-04031
Does outdoor
unit operate?
YES
NO
Are 1, 2 and 3 crossover
wires connected properly?
YES
Is connector
connected properly?
YES
Does LED (Orange) on
outdoor P.C. board blink?
YES
Does LED (Green) on
outdoor P.C. board blink?
YES
NO
NO
NO
NO
Outdoor P.C. board
is defective.
Indoor P.C. board
is defective.
Connect crossover
wires properly.
Connect crossover
properly.
Replace
P.C. board.
Replace
P.C. board.
[08 Four-way valve error]
Does four-way valve
operate properly?
Is TC sensor resistance
value (10kΩ at 25°C)
YES
normal?
NO
NO
YES
Does coil terminal
have 220 – 240 V
in heating operation?
NO
Are circuit
wires normal?
YES
Is outdoor P.C. board
normal?
YES
YES
NO
NO
– 51 –
Four-way valve
is defective.
Outdoor P.C. board
is defective.
Indoor P.C. board
is defective.
Replace
Four-way valve
Circuit check/modification
Replace
P.C. board.
Replace
P.C. board.
Replace TC sensor.
Page 53
[09 Other cycle error] (1)
FILE NO. SVM-04031
NO
Replace TC
sensor.
YES
Connect TC
sensor properly.
Does compressor
operate?
YES
Is compressor
turned off shortly?
NO
Is TC sensor
resistance value
(10kΩ at 25°C) normal?
YES
Is TC sensor
disconnected from the
sensing element?
NO
NO
YES
(in compressor)
Is circuit wiring
P.C. board normal?
Does inner
overload relay
operate?
NO
normal?
YES
Is outdoor
YES
YES
NO
NO
Check charged amount of refrigerant.
Check defective overload.
Check compressor.
Failure
Wiring check/modification
Outdoor P.C. board
is defective.
Indoor P.C. board
is defective.
Replace
compressor.
Replace
P.C. board.
Replace
P.C. board.
[09 Other cycle error] (2)
NO
Connect
connector
properly.
NO
Replace
condenser.
NO
Replace
fan motor.
Is connector
connected properly?
Is condenser
Is indoor fan
motor normal?
YES
normal?
YES
YES
NO
Does indoor fan
operate?
Are filters clogged?
Is TC sensor
resistance value (10kΩ
at 25°C) normal?
Is charged amount of
refrigerant normal?
Is outside air
low load?
YES
NO
YES
YES
NO
YES
NO
NO
YES
Clean filters.
Replace
TC sensor.
Anti-freezing
operation
Charge
refrigerant.
Anti-freezing
operation
Indoor P.C. board
is defective.
– 52 –
Replacd
P.C. board.
Page 54
[0C Indoor TA sensor error]
FILE NO. SVM-04031
Is CN03 (TA sensor connector)
connected properly?
YES
Is TA sensor resistance value
(10 kΩ at 25°C) normal?
YES
[0d Indoor TC sensor error]
Is CN01 (TC sensor connector)
connected properly?
YES
NO
NO
NO
Indoor P.C. board is defective.
Connect CN03
properly.
Replace T A sensor.
Replace P.C. board.
Connect CN01
properly.
Is TC sensor resistance value
(10 kΩ at 25°C) normal?
YES
[18 outdoor TE sensor error]
Is TE sensor connector
connected properly?
YES
Is TE sensor resistance value
(10 kΩ at 25°C) normal?
YES
NO
NO
NO
Indoor P.C. board is defective.
Replace TC sensor.
Replace P.C. board.
Connect connector
properly.
Replace TE sensor.
Indoor P.C. board is defective.
– 53 –
Replace P.C. board.
Page 55
[19 outdoor TD sensor error]
FILE NO. SVM-04031
Is TD sensor
connected properly?
YES
Is TD sensor resistance value
(50 kΩ at 25°C) normal?
YES
[1E Discharge temp. error]
Is protective controller
such as discharge
thermostat normal?
YES
NO
NO
NO
Indoor P.C. board is defective.
Are wires connected to
connector properly?
NO
Connect connector
properly.
Replace TD sensor.
Replace P.C. board.
Connect wires to
connector properly.
Is charged amount
of refrigerant normal?
YES
Is overload relay normal?
NO
Is TD sensor resistance value
(50 kΩ at 25°C) normal?
YES
NO
YES
NO
Outdoor P.C.board is defective.
Check and modify charged
amount of refrigerant.
Unit operates normally.
Replace TD sensor.
Replace P.C. board.
– 54 –
Page 56
9-6. Troubleshooting for Indoor Unit
Operation
Measure
Item by symptoms
Check item
Conceivable principle
cause
9-6-1. Power can not be turned on. (The unit does not operate at all.)
<Primary check>
(1) Is the supply voltage normal?
(2) Is the connection to the AC output OK?
(3) Are the connection of the primary side and the secondary side of
the power transformer inserted into the P.C. board?
(4) Is the fuse (F01) blown?
Is fuse (F01)
of indoor
control board
(DC 12V or 5V)
indicated on
rear of indoor
control board
310 - 340V
supplied to
primary side
of transfer
Are AC 14V,
supplied to
secondary
blown?
NO
Is voltage
normal?
NO
Is DC
switch?
YES
and
AC 7V
side of
transfer
switch?
YES
YES
YES
NO
NO
Turn off power
supply once, and
5 second later,
turn it on again.
Is OPERATION
lamp blinking?
Is it possible to
turn on power
supply by pressing
[START/STOP]
remote control?
transmission mark
on remote control
flash normally, and
Check selector
switch of remocon
A or B is correct
remote controller
Parts (R21,
R22, SG01,
C15, C01,
DB01, C02,
and T01) are
defective.
Refer to
<Primary check>
or this problem is
one step short of
power P.C. board
block.
Turn off breaker
once and turn it
on again after
removing motor.
button on
NO
Does
is its signal
transmitted
properly?
YES
same as
YES
YES
NO
NO
Are AC 14
and AC 7V
supplied to
secondary
side of
transfer
switch?
YES
Remote control is
defective.
Does the
fan motor
connector between
1and 3
short-circuit?
YES
Microcomputer is
defective.
V
SW transformer
NO
(T01) or Tr (Q01)
for power supply
is defective.
FILE NO. SVM-04031-(1)
Unit operates
normally.
Refer to 9-9
Troubleshooting for
Remote Control.
Select switch to
remocon A,B for
correct same as
remote controller
NO
Replace main P.C.
board.
Replace motor.
– 55 –
Page 57
9-6-2. Only indoor fan motor does not operate.
Shut off the
power supply once.
Turn the power supply.
FILE NO. SVM-04031
Does the fan stop in
no operating status?
YES
Start the operation
with low fan setting
in cool operation.
Does the fan rotate?
YES
Change the setting of
cooling to high fan.
Does the fan speed
become higher?
YES
NO
NO
NO
Control P.C. board is defective.
Does AC 120V
or higher voltage apply
to between red and black
lead of fan motor?
YES
Shut off the power supply.
Does the cross flow
fan rotate normally?
YES
Turn on the power supply.
Operation
stops
Replace the P.C. board.
Does connecting
terminal, connecting
NONO
NO
cable or power supply
cord completely?
Does not found the short
wire about connecting
cable and power cord?
YES
Repair the
bearing of
the fan.
Motor control circuit failure
(IC30, IC03, RY501) or 12V
power circuit failire
(D305, D306, Q301, T01).
Replace the P.C. board.
Thermal fuse operated
due to prevent
temperature rising cause
of incompleted connecting.
Normal
Is the rotation signal
(DC+5V-0V)output between 3
(Brown lead wire) and 2 (Gray
lead wire) of the motor connector
(CN11) when rotating the cross
flow fan by hand in no operating
status? (3 pulses/one turn)
YES
Replace the control
P.C. board.
– 56 –
NO
Replace the of
fan motor
Replace connecting the
cable (or power cord),
thermal fuse and
terminal block.
Page 58
9-6-3. Compressor does not operate.
<Primary check>
(1) Is the preset temperature higher than the room temperature in cooling operation?
(2) Is the crossover cable connected properly?
<Inspection procedure>
-Cooling only model-
Turn on power supply.
FILE NO. SVM-04031
Does OPERATION
lamp blink?
YES
Does miniature relay RY04
switch on and off due to
temperature changes?
YES
Is it possible to detect AC
220 – 240V between 2
and 3 on terminal block?
YES
Are all of compressor cords normal?
YES
Is compressor motor winding
Is capacitor for compressor normal?
normal?
(Check winding resistor.)
YES
NO
NO
NO
Is resistance value of
thermo sensor (TA) and heat
exchanger sensor (TC) normal?
YES
Microcomputer is defective.
Miniature relay RY04
is defective.
NO
NO
NO
Compressor is defective.
Capacitor is defective.
NO
Refer to 9-6-1
“Power can not be
turned on”.
Thermo sensor or
heat exchanger
sensor is defective.
Replace thermo sensor or
heat exchanger sensor.
Replace P.C. board.
Rewire or replace
defective cords.
Replace compressor.
Replace capacitor.
YES
Is overload relay normal?
YES
Does compressor start?
YES
Does compressor stop after a while?
YES
Is gas quantity normal?
(Check gas pressure.)
YES
Compressor is defective.
YES
Replace P.C. board.
NO
NO
NO
Overload relay is defective.
Compressor is defective.
Gas shortage (Gas leak)
– 57 –
Replace overload relay.
Replace compressor.
Supply gas.
Page 59
<Inspection procedure>
- Colling model -
Turn on power supply.
FILE NO. SVM-04031-(1)
Does OPERATION
lamp blink?
YES
Is it possible to start
unit by remote control?
YES
Is it possible to detect AC 200V
between 2 and 3 on terminal block?
YES
Is crossover cable normal?
YES
Are all of compressor cords normal?
YES
Is compressor motor winding normal?
(Check winding resistor.)
YES
Is capacitor for compressor normal?
YES
NO
NO
NO
NO
NO
NO
NO
Compressor is defective.
Capacitor is defective.
Refer to item Power
can not be turned on .
Refer to 9-9 Troubleshooting
for Remote Control .
Replace P.C. Board
and TC sensors.
Connect crossover
cable properly.
Rewire or replace
defective cords.
Replace compressor.
Replace compressor.
Is overload relay normal?
YES
Does compressor start?
YES
Does compressor stop after a while?
YES
Is gas quantity normal?
(Check gas pressure.)
YES
Compressor is defective.
YES
Replace P.C. borad
NO
NO
NO
Overload relay is defective.
Compressor is defective.
Gas shortage (Gas leak)
Replace overload relay.
Replace compressor.
Supply gas.
− 58−
Page 60
<Inspection procedure)
- Heating model -
AC 70-100V
FILE NO. SVM-04031-(1)
Replace transformer
outdoor
P.C. board.
−59 −
Page 61
YES
FILE NO. SVM-04031-(1)
Are all of compressor cords normal?
YES
Is compressor motor winding normal?
(Check winding resistor.)
YES
Is capacitor for compressor normal?
YES
Is overload relay normal?
YES
Does compressor start?
YES
Does compressor stop after a while?
YES
Is gas quantity normal?
(Check gas pressure.)
YES
NO
NO
NO
NO
NO
NO
Compressor is defective.
Capacitor is defective.
Overload relay is defective.
Compressor is defective.
Gas shortage (Gas leak)
Rewire or replace
defective cords.
Replace compressor.
Replace capacitor.
Replace overload relay.
Replace compressor.
Supply gas.
Compressor is defective.
YES
Replace compressor.
– 60 –
Page 62
FILE NO. SVM-04031-(1)
9-7. Troubleshooting for Wiring (Interconnect cable and Serial Signal Wire)
9-7-1. Outdoor unit does not operate.
<Inspection procedure>
(1) Is the voltage between and of the indoor terminal block varied?
1
(2) Are signals from the indoor unit to the outdoor unit transmitted correctly based upon the following diagram?
NOTE:
Measure the voltage for 2 minutes and 30 seconds after starting the unit.
Prepare a diode for checking.
Heatpump model
Terminal block on indoor side
Red
2
3
White
2
1
Terminal block
Tester
Normal condition : Voltage varied between AC70 ~ 100V
Abnormal condition : Voltage does not vary.
Cooling model
Terminal block on indoor side
Red
White
3
2
1
Terminal block
Tester
Fig. 9-7-1
Normal condition : After start operated about 2 minutes and 30 seconds. Voltage between 2 and 3 of the
of the indoor's Terminal block should be equal AC 220 ~ 240V.
Abnormal condition : Don't found voltage AC 220 ~ 240V (For Asia model), AC 220V from terminal block (0V).
9-7-2. Outdoor unit stops a while after starting the unit.
<Confirmation procedure> Select one of 3 cases below and follow the procedure.
(1) The outdoor unit stops between 10 and 20 minutes passed after starting and it takes 10 minutes or more to
restart the unit.
Gas has a low circulation.
Measure gas pressure.
Compressor is turned off and on automatically by thermo sensor
(Heat pump Model) or thermostat (Cooling only Model).
Gas shortage
Gas leak
Pipe clogging
(2) The outdoor unit stops once, it would not operate until the power is turned on again.
Refer to 9-6-4 "Compressor does not operate"
(3) The outdoor unit stops between 10 minutes to 1 hour after starting and a check code is indicated on the
remote control. (Check code 03-1E : Refer to Table 9-4-1.)
−61−
Page 63
FILE NO. SVM-04031-(1)
9-8. Troubleshooting for P.C. Board
9-8-1. How to check indoor P.C. board
<Cautions for handling P.C. board>
(1) When removing the front panel and the P.C. board,
be sure to turn off the power supply.
(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 housing. Do not pull at
lead wires.
<Inspection procedure>
(1) If the P.C. board is detective, check for
disconnection, burn or discoloration of the copper
foil pattern of the P.C. board.
(2) The P.C. board consists of the following 2 parts:
a. Main P.C. board parts:
Power relay, indoor fan motor drive circuit and
control circuit, C.P.U. and peripheral circuits, buzzer
drive circuit and buzzer.
b. Infrared rays parts:
Infrared rays receiving circuit
Check the defects of the P.C. board with Table 9-8-1.
Table 9-8-1 Inspection procedure
No.ProcedureCheck pointsCauses
1Turn off the power supply and
remove the P.C. board assembly
from electric parts base. Remove the
connecting cables from the terminal
block.
2Remove the connector of the motor
and turn on the power supply. If
OPERATION lamp blinks (once per
second), it is not neccessary to
check steps (1 to 3) in the right next
column.
Check whenther or not the fuse (F01)
is blown.
Check power supply voltage;
1. Between TP3 and TP4 of CN30
and CN31 (220 – 240V AC)
2. Between + and – of C02
(DC310 – 340V)
3. Between 12V and GND
4. Between 5V and GND
Impluse voltage was applied or the
indoor fan motor short-circuited.
1. The terminal block or the crossover cable is connected wrongly.
2. The capacitor (C01 and C15), line
filter (L01), resistor (R01), or the
diode (DB01) is defective.
3. Q301, F02 and T01 are defective.
4. Q301, F03, IC07 and T01 are
defective.
3Press [START/STOP] button once to
start the unit. (Do not set the mode
to Fan Only or On-Timer operation.)
4Shorten the line of the restart delay
timer and start unit.
5Press [START/STOP] button once to
start the unit.
• Shorten the time of the restart
delay timer.
• Set the operation mode to COOL.
• Set the fan speed level to AUTO.
• Set the preset temperature much
lower than the room temperature.
(The unit (compressor) operates
continuously in the above
condition.)
Check power supply voltage;
<Heating and cooling model>
1. Between CN31 and CN23
(AC70 – 100V)
<Cooling only model>
1. Between collector of Q33 and
GND (for relay coil (DC12V))
2. Between 2 and 3 of terminal block
for connecting cable
Check whether or not all lamps
(OPERA TION, TIMER,
PRE.-DEF. (or FAN ONLY), ECO and
AUTO) are indicated for 3 seconds
1. Check whether or not the
compressor operates.
2. Check whether or not the
OPERATION lamp blinks.
<Heating and cooling model.>
IC05 and IC06 are defective.
<Cooling only model>
1. The wire of the relay coil (RY04)
comes down or the relay drive
(Q33) is defective.
2. CN27 or RY04 is connected
wrongly.
The lamps are defective or the
housing assembly (CN13) is
defective.
1. The temperature of the indoor
heat exchanger is extremely low.
2. The connection of the heat
exchanger sensor is loose.
(The connector is disconnected.)
(CN01)
3. The heat exchanger sensor and
the P.C. board are defective.
(Refer to Table 9-8-2.)
4. The main P.C. board is defective.
– 62 –
Page 64
FILE NO. SVM-04031-(1)
No.ProcedureCheck pointsCauses
6If the above condition (No. 6) still
continues, start the unit in the
following condition.
• Set the operation mode to HEAT.
• Set the preset temperature much
higher than room temperature.
1. Check whether or not the
compressor operates.
2. Check whether or not the
OPERATION lamp blinks.
1. The temperature of the indoor
heat exchanger is extremely high.
2. The connector of the heat exchanger sensor short-circuited.
(CN01)
3. The heat exchanger sensor and
the P.C. board are defactive.
(Refer to Table 9-8-2.)
4. The main P.C. board is defective.
6Connect the motor connector to the
motor and turn on the power supply.
Start the unit in the following
condition.
• Set the operation mode to FAN.
• Set the fan speed level to HIGH.
(The unit (compressor) operates
continuously in the above
1. Check it is impossible to detect
the voltage between 2 and 3 of
the CN11.
2. The motor does not operate.
(But it is possible to receive the
signal from the remote control.)
2. The motor rotates but vibrates
strongly.
1. The indoor fan motor is defectiv e.
(Protected operation of
P.C. board)
2. The connection of the motor
connector is loose.
3. The P.C. board is defective.
condition.)
Table 9-8-2 Approximate resistance value of thermo sensor
Temperature0°C10°C20°C25°C30°C
Resistance value35.820.712.610.07.92
(kΩ)
9-8-2. How to shorten time of restart delay timer
1 Press [CLR] button while pressing [CHECK] button
with a tip of a pencil.
2 Then press [START/STOP] button ot transmit the
signal to the indoor unit.
AUTOA
START/STOP
FANMODE
SWING
ON
ECO
TIMER
FIX
OFFSETCLR
FILTER
AB
PRESET
AUTO
Hi-POWER
MEMO
CLOCK CHECKRESET
2
1
– 63 –
Page 65
9-8-4. P.C. board layout
FILE NO. SVM-04031
T op View
Bottom View
– 64 –
Page 66
9-9. Troubleshooting for Remote Control
FILE NO. SVM-04031
Is receiver on
indoor unit exposed
to direct sunlight?
YES
NO
Is there any
thyristor fluorescent
light nearby?
YES
NONO
Press START/STOP
button.
Is transmission
mark indicated?
YES
Does indoor unit
operate when
moving remote control
near receiver or
indoor unit?
YES
Batteries are
exhausted.
The unit does not beep at all.
OPERATION lamp on
indoor unit is not indicated.
NO
Press RESET button
on remote control
with tip of pencil.
Press START/STOP
button.
Avoid direct
sunlight.
NO
Keep indoor unit
away from
thyristor
fluorescent light.
Does indoor unit
start to operate by
automatic restart
function?
YES
Does radio sound
is affected by
remote control when
a signal is transmitted
at distance of 5 cm
from radio?
YES
P.C. board is
defective.
Replace
P.C. board.
Is transmission mark
indicated?
NO
Does indoor unit
beep and operate?
NO
Replace
batteries.
Note : After replacing batteries,
press the RESET button
with a tip of a pencil.
Normal
operation
NO
YES
YES
Remote control
is defective.
Replace
remote control.
– 65 –
Page 67
FILE NO. SVM-04031
10. PARTS REPLACEMENT
10-1. Indoor Unit
No.Part nameProceduresRemarks
Air Inlet grille
1<How to remove the Air inlet grille>
1) Stop the operation of the Air conditioner
and turn off its main power supply.
2) Open the Air inlet grille with both hands.
Air inlet grille
3) Unfasten 3 screws (about two to three
rounds) for fixing the Panel arms.
4) Move the Air inlet grille toward.
5) Remove the Grille stopper from the axis of
the Front panel. After that, remove the Air
inlet grille.
6) Remove the Panel arms from the Front panel.
Panel arm
Grille stopper
Air inlet grille
Panel arm
<How to install the Air inlet grille>
1) Insert three Panel arms on the Air inlet
grille and fix each securely by screws.
2) Set the Air inlet grille arm to the axis of the
Front panel. (Refer to page 34, 8-4-3)
3) Insert the Grille stopper to the correct
position and fix it securely with screws.
4) Push the Air inlet grille to the correct position.
– 66 –
Page 68
FILE NO. SVM-04031
No.Part nameProceduresRemarks
Front panel
2<How to remove the Front panel>
1) Remove the Air inlet grille. (1)
2) In case of the Drain hose is installed
through the Front panel.
: Remove the Drain band from the Front
panel.
: Cut away the Opening base for piping
from Front panel and keep parts.
3) Open 3 Cap screws and remove the
screws.
4) Remove 5 screws fixing the Front panel.
Drain band
Cap screws
Front Panel
Drain panel
5) Remove the hooks of the Panel LED nearly
side from the Drain pan.
(Continue)
– 67 –
Screws
Page 69
FILE NO. SVM-04031
No.Part nameProceduresRemarks
Front panel
26) Remove both side hooks and remove the
Front panel by turn to air inlet part
direction.
<How to install the Front panel>
1) In case of the Drain hose installation
through the Front panel, install the opening
base for piping in the Back body by a screw
(M4 x 12). Prepare it by yourself.
2) Fit the Front panel in the Drain pan. Then
fix it in the Drain pan with 2 hooks in the
center of the air outlet.
3) Fix 5 hooks around the Front panel with
conformation the Guide-rib is inserting into
the Back body.
4) Fix 8 screws and close 3 Cap screws.
5) Install the Drain band into the Front panel.
6) Check the gap between the Front panel
and the Back body.
3<How to remove the Drain pan>
Drain pan
assembly
1) Remove the Air inlet grille and the Front
panel. (1, 2)
2) Remove the Louver motor from the Drain
pan.
Hook
Guide-rib
3) Remove the shaft of Horizontal louver.
4) Remove the LED base and Electrical wire.
5) Remove the TA sensor wire.
6) Remove the Drain hose.
(Continue)
Louver motor
Electrical wire
Shaft of Horizontal lover
Drain hose
LED base
TA sensor
– 68 –
Page 70
FILE NO. SVM-04031
No.Part nameProceduresRemarks
Drain pan
37) Remove 7 screws and remove the Drain
assembly
pan assembly.
Screw
Screw
Drain Pan
Electrical parts
4<How to remove the Electrical parts assembly>
assembly
1) Remove the Air inlet grille, the Front panel
and the Drain pan assembly. (1, 2, 3)
2) Remove the Terminal cover.
3) Unfasten the screw of Cord clamp and
disconnect the connecting cable.
4) Remove the Connector cover and
disconnect the Fan motor cords.
5) Remove the TC sensor and earth wire from
Refrigeration assembly.
6) Remove the Electrical parts assembly.
NOTE : When install the electrical parts
assembly, fix the screw after the Back body
is fixed.
5
Refrigeration
assembly
<How to remove the Refrigeration assembly>
1) Remove the Air inlet grille, the Front panel
and the Drain pan assembly. (1, 2, 3)
2) Stop the gas at the Outdoor unit.
3) Remove 2 pipes from the Refrigeration
assembly.
4) Remove the TC sensor from holder.
5) Remove the pipe holder.
6) Remove the earth wire.
Connecting
cable
Electrical parts
assembly
Cord clamp
Earth wire
TC sensor
Earth wire
Fan motor cords
TC sensor
Refrigeration
assembly
Pipe holder
– 69 –
(Continue)
Page 71
FILE NO. SVM-04031
No.Part nameProceduresRemarks
Refrigeration
57) Remove 2 screws and remove the
assembly
6<How to remove the Multiblade fan and
Multiblade fan
and Fan motor
refrigeration assembly with pushing it to
right hand.
2 Screws
Fan cover
Fan motor>
1) Remove the Air inlet grille and the Front
panel. (1, 2)
2) Disconnect 2 connectors.
3) Remove the Fan covers.
4) Remove the Motor band with holding the
Fan motor and then remove the Fan motor
with the Multi-blade fans.
5) Unfasten the Set-screw and remove the
Multi-blade fans.
Motor band
Motor
Multi-blade fan
2 Connectors
– 70 –
Page 72
FILE NO. SVM-04031
10-2. Outdoor Unit (RAS-18UAH-ES3)
No. Part name Procedures Remarks
1 Common
procedure
1) Stop the operation of the air conditioner and turn off
its main power supply or remove the power supply
cord.
2) Remove the electrical parts cover.
(4 screws ∅4 x 10L)
3) Remove 2 cord clamps (4 screws ∅4 x 22L) and
disconnect the power supply cord and connecting
cable after removing 6 screws on the terminal block
and 1 ground screw on the electrical parts base.
4) Remove the front cabinet. (8 scerws ∅4 x 10L)
(Pull the front lower portion toward you, and pull out
it upward to remove it.)
5) Remove the side cabinet. (8 screws ∅4 x 10L)
Remove
8 screws ∅4 x 10L
4 screws ∅4 x 22L4 screws ∅4 x 10L
2 Running
capacitor
for compressor
3 Running
capacitor
for fan motor
4 Magnetic
contactor
5 Transformer
6 P.C. Board
1) Perform the common procedure 1
2) Remove the capacitor band. (1 screw ∅4 x 10L)
3) Disconnect the lead wires from the capacitor
terminal.
1) Perform the common procedure 1
2) Remove the fixing screw. (1 screw ∅4 x 10L)
3) Disconnect the lead wires from the capacitor
terminal.
1) Perform the common procedure 1
2) Remove the fixing screw. (2 screws ∅4 x 10L)
3) Disconnect the lead wires from the relay terminal.
1) Perform the common procedure 1
2) Remove the fixing screw. (2 screws ∅4 x 10L)
3) Disconnect the housing from the P.C. Board.
1) Perform the common procedure 1
2) Disconnect the lead wires from the P.C. Board.
3) Remove P.C. Board after unhooking 4 clams.
Running capacitor
for compressor
P.C. Board
Transformer
Running capacitor
for fan motor
Magnetic
contactor
− 71−
Page 73
FILE NO. SVM-04031
10-3. Outdoor Unit (RAS-18UA-ES3)
No. Part name Procedures Remarks
1 Common
procedure
1) Stop the operation of the air conditioner and turn off
its main power supply or remove the power supply
cord.
2) Remove the electrical parts cover.
(2 screws ∅4 x 10L)
3) Remove 2 cord clamps (4 screws ∅4 x 22L) and
disconnect the power supply cord and connecting
cable after removing 6 screws on the terminal block
and 1 ground screw on the electrical parts base.
4) Remove the front cabinet. (8 scerws ∅4 x 10L)
(Pull the front lower portion toward you, and pull out
it upward to remove it.)
5) Remove the back cabinet. (4 screws ∅4 x 10L)
Remove
8 screws ∅4 x 10L
4 screws ∅4 x 22L 4 screws ∅4 x 10L
2 Running
capacitor
for compressor
3 Running
capacitor
for fan motor
4 Magnetic
contactor
5 Spark killer
1) Perform the common procedure 1
2) Remove the capacitor band. (1 screw ∅4 x 10L)
3) Disconnect the lead wires from the capacitor
terminal.
1) Perform the common procedure 1
2) Remove the fixing screw. (1 screw ∅4 x 10L)
3) Disconnect the lead wires from the capacitor
terminal.
1) Perform the common procedure 1
2)
Remove the fixing screw. (2 screw ∅4 x 10L)
3) Disconnect the lead wires from the relay terminal.
1) Perform the common procedure 1
2) Remove the fixing screw. (1 screw ∅4 x 10L)
3) Disconnect the lead wires from the terminal.
Running
capacitor for
compress or
Running
capacitor for
fan motor
Spark killer
Magnetic
contactor
−72−
Page 74
FILE NO. SVM-04031-(1)
10-4. Outdoor Unit (RAS-24UAH-ES3, RAS-24UA-ES3)
No. Part name Procedures Remarks
1 Common
procedure
1) Stop the operation of the air conditioner and turn off
its main power supply or remove the power supply
cord.
2) Remove the electrical parts cover.
(4 screws ∅4 x 10L)
3) Remove 2 cord clamps (4 screws ∅4 x 22L) and
disconnect the power supply cord and connecting
cable after removing 6 screwson on the terminal
block and 1 ground screw on the electrical parts
base.
4) Remove the top cabinet. (7 screws ∅4 x 10L)
5) Remove the front cabinet. (2 screws ∅4 x 10L)
6) Remove the side cabinet
(4 screws ∅4 x 10L & 2 screws ∅4 x 14L)
Top cabinet
Front cabinetSide cabinet
4 screws ∅4 x 22L
Electrical
parts cover
2 Running
capacitor
for compressor
3 Running
capacitor
for fan motor
4 Magnetic
contactor
5 Transformer
(Heat pump model)
6 P.C. Board
(Heat pump model)
7 Spark killer
(Cooling only model)
1) Perform the common procedure 1
2) Remove the capacitor band. (1 screw ∅4 x 10L)
3) Disconnect the lead wires from the capacitor
terminal.
1) Perform the common procedure 1
2) Remove the fixing screw. (1 screw ∅4 x 10L)
3) Disconnect the lead wires from the capacitor
terminal.
1) Perform the common procedure 1
2) Remove the fixing screw. (2 screws ∅4 x 10L)
3) Disconnect the lead wires from the terminal.
1) Perform the common procedure 1
2) Remove the fixing screw. (2 screws ∅4 x 10L)
3) Disconnect the housing from the P.C. Board.
1) Perform the common procedure 1
2) Disconnect the lead wires from the P.C. Board.
3) Remove P.C.Board after unhooking 4 clams.
1) Perform the common procedure 1
2) Remove the fixing screw. (1 screw ∅4 x 10L)
3) Disconnect the lead wires from the terminal.
Magnetic contactor
P.C. Board
Transformer
Spark killer
Running capacitor
for compressor
Running capacitor
for fan motor
RAS-24UAH-ES3
Running capacitor
for compressor
− 73 −
Magnetic contactor
RAS-24UA-ES3
Running capacitor
for fan motor
Page 75
11. EXPLODED VIEWS AND PARTS LIST
11-1. Indoor Unit (E-Parts Assy)
FILE NO. SVM-04031
LocationPart
No.No.
401 43T69311 PC Board (RAS-24UFHP-ES3)
401 43T69312 PC Board (RAS-24UFP-ES3)
401 43T69313 PC Board (RAS-18UFHP-ES3)
401 43T69314 PC Board (RAS-18UFP-ES3)
40243T50004 Temperature sensor
40343T60002 Terminal
40443T62003 Cord clamp
Description
LocationPart
No.No.
40543T69315 Display unit
40643T50302 Temperature sensor
407 43T69311 PC Board (RAS-24UFHP-ES3)
407 43T69312 PC Board (RAS-24UFP-ES3)
407 43T69313 PC Board (RAS-18UFHP-ES3)
407 43T69314 PC Board (RAS-18UFP-ES3)
40843T08349 Switch cover