Toshiba RAS-10SKH-E User manual

SERVICE M ANUAL
SPLIT W A LL TY PE
TO SH IB A
P R IN TE D IN JA P A N ,N ov.,1996 T oM o
FIL E N O .A 00-9619
AIR-CONDITIONER
RAS-10SKH-E RAS-10SAH-E
RAS-10SKHX RAS-10SAHX

– 2 –
CONTENTS
1. SPECIFICATIONS............................................................................................................ 4
2. CONSTRUCTION VIEWS ................................................................................................ 6
2-1. Indoor Unit .................................................................................................................................. 6
2-2. Outdoor Unit ............................................................................................................................... 7
3. WIRING DIAGRAM .......................................................................................................... 8
4. SPECIFICATIONS OF ELECTRICAL PARTS ................................................................. 9
4-1. Indoor Unit .................................................................................................................................. 9
4-2. Outdoor Unit ............................................................................................................................... 9
5. REFRIGERANT CYCLE DIAGRAM .............................................................................. 10
6. MICRO-COMPUTER BLOCK DIAGRAM .......................................................................11
7. OPERATION DESCRIPTIONS....................................................................................... 12
7-1. FAN ONLY Operation ............................................................................................................... 12
7-2. COOL Operation ....................................................................................................................... 12
7-2-1. Louver Control ......................................................................................................................................13
7-3. DRY Operation.......................................................................................................................... 13
7-4. HEAT Operation........................................................................................................................ 14
7-4-1. Louver Control ......................................................................................................................................14
7-4-2. Cool Airflow Control .............................................................................................................................14
7-5. AUTO Operation ....................................................................................................................... 15
7-5-1. Temporary Auto .....................................................................................................................................15
7-6. ECONO. Mode........................................................................................................................... 16
7-6-1. Cooling...................................................................................................................................................16
7-6-2. Heating ...................................................................................................................................................16
7-7. Current Limit Control............................................................................................................... 16
7-8. High-Temperature Limit Control (Heating Operation).......................................................... 17
7-9. Low-Temperature Limit Control (Cooling Operation) .......................................................... 17
7-10. Cool Airflow Prevention Control (Heating Operation) ......................................................... 17
7-11. Defrost Operation..................................................................................................................... 18
7-11-1. Condition to Start the Defrost Operation............................................................................................18
7-11-2. Defrost Operation Time Control ..........................................................................................................18
7-11-3. Ending Condition at Defrost Operation ..............................................................................................18
7-12. Auto Restart Function ............................................................................................................. 19
7-12-1. How to Set the Auto Restart.................................................................................................................19
7-12-2. How to Cancel the Auto Restart ..........................................................................................................20
7-12-3. In Case of Power Failure during the Timer Operation.......................................................................20
8. INSTALLATION PROCEDURE...................................................................................... 21
8-1. Safety Cautions ........................................................................................................................ 21
8-2. Installation Diagram of Indoor and Outdoor Units............................................................... 23
8-3. Installation ................................................................................................................................ 24
8-3-1. Optional Parts........................................................................................................................................24
8-3-2. Kit Parts .................................................................................................................................................25

– 3 –
8-4. Indoor Unit ................................................................................................................................ 26
8-4-1. Cutting a Hole and Mounting Installation Plate .................................................................................26
8-4-2. Electrical Work ......................................................................................................................................27
8-4-3. Wiring Connection ................................................................................................................................28
8-4-4. Piping and Drain Hose Installation......................................................................................................30
8-4-5. Indoor Unit Installation .........................................................................................................................31
8-4-6. Drainage.................................................................................................................................................31
8-5. Outdoor Unit ............................................................................................................................. 32
8-5-1. Refrigerant Piping Connection ............................................................................................................33
8-5-2. Vacuum Pumping ..................................................................................................................................33
8-5-3. Wiring Connection ................................................................................................................................34
8-6. Others........................................................................................................................................ 35
8-6-1. Gas Leak Test ........................................................................................................................................35
8-6-2. Test Operation .......................................................................................................................................35
8-6-3. Auto Restart Setting .............................................................................................................................35
9. TROUBLESHOOTING CHART...................................................................................... 36
9-1. What to be Prechecked First .................................................................................................. 36
9-1-1. Power Supply Voltage...........................................................................................................................36
9-1-2. Incorrect Cable Connection between Indoor and Outdoor Units.....................................................36
9-1-3. Misleading but Good Operations.........................................................................................................37
9-2. Primary Judgement of Trouble Sources ............................................................................... 38
9-2-1. Role of Indoor Unit Controller..............................................................................................................38
9-2-2. Display of Abnormalities and Judgement of the Abnormal Spots...................................................38
9-3. Troubleshooting Flowcharts................................................................................................... 42
9-3-1. Power can not be Turned on ................................................................................................................42
9-3-2. Power can not be Turned on after Replacing Indoor PC Board .......................................................43
9-3-3. Outdoor Unit does not Operate ...........................................................................................................43
9-3-4. Only Compressor does not Operate ...................................................................................................44
9-3-5. Only Outdoor Fan does not Operate ...................................................................................................45
9-3-6. Only 4-Way Valve does not Operate ....................................................................................................46
9-3-7. Only the Indoor Fan does not Operate................................................................................................47
9-4. How to Check the Remote Control (Including the Indoor PC Board) ................................ 48
9-4-1. How to Check the PC Board.................................................................................................................49
9-4-2. PC Board Layout ...................................................................................................................................51
9-4-3. How to Reduce the OperationTime of the Anti-RestartTimer .........................................................52
10. PART REPLACEMENT ................................................................................................. 53
10-1. Indoor Unit ................................................................................................................................ 53
10-2. Microcomputer ......................................................................................................................... 55
10-3. Outdoor Unit ............................................................................................................................. 56
11. CAUTIONS ON REPLACEMENT OF PC BOARD ASSEMBLY.................................... 57
12. EXPLODED VIEWS AND PARTS LIST......................................................................... 58
12-1. Indoor Unit (1)........................................................................................................................... 58
Indoor Unit (2)........................................................................................................................... 59
Indoor Unit (3)........................................................................................................................... 60
12-2. Outdoor Unit ............................................................................................................................. 61

– 4 –
HEATING
0.89/0.90/0.91
95/92/88
– 5 ~ 21
RAS-10SKH-E/10SAH-E, RAS-10SKHX/10SAHX
Single
220/230/240
50
19
1.2
41/36/31
47/48/49
R-22
0.74
Capillary tube
9.52
Flare connection
6.35
Flare connection
10
5
16
RAS-10SKH-E/RAS-10SKHX
265
790
174
8
Finned tube
Cross flow fan
600
500
400
19
Polypropylene net filter (Washable)
RAS-10SAH-E/RAS-10SAHX
530
770
200
31
Finned tube
Propeller
1600
18
PH120T1-4C
750
Fuse, Overload relay
Yes
COOLING
0.98/0.99/1.02
95/92/90
21 ~ 43
1. SPECIFICATIONS
Specifications are subject to change without notice.
Model
kW
Phase
V
Hz
kW
%
A
Indoor/Outdoor
A
lit/h
dB
dB
kg
mm
mm
m *2
m
mm
mm
mm
mm
kg
m3/h
m3/h
m3/h
W
mm
mm
mm
kg
m3/h
W
W
°C
Item
Capacity
Power source
Power consumption
Power factor
Running current
Starting current
Moisture removal
Noise
Refrigerant
Refrigerant control
Interconnection pipe
Condensate drain pipe
INDOOR UNIT
Dimensions
Net weight
Evaporator type
Indoor fan type
Air volume
Fan motor output
Air filter
OUTDOOR UNIT
Dimensions
Net weight
Condenser type
Outdoor fan type
Airflow volume
Fan motor output
Compressor
Safety device
Auto louver
Usable outdoor temperature range
*1
Indoor (H/M/L)
Outdoor (220/230/240V)
Name of refrigerant
Rated volume
Gas side size
Connection type
Liquid side size
Connection type
Maximum length (of one way)
Maximum height difference
Indoor unit
Outdoor unit
Outer diameter
Height
Width
Depth
High fan
Medium fan
Low fan
Height
Width
Depth
Model
Output
220V
2.65 240V 2.70 230V 3.05
220V
3.00 240V 3.10
230V
2.68
220V
0.11/4.58 230V 0.11/4.57 240V 0.11/4.61 220V 0.11/4.17 230V 0.11/4.16 240V 0.11/4.22
↑
↓

– 5 –
Note : *1
• Capacity is based on the following temperature conditions.
Cooling
27°C
19°C
35°C
24°C
Heating
20°C
12°C
7°C
6°C
JIS C9612-1994Condition
(DB)
(WB)
(DB)
(WB)
Temperature
Indoor unit inlet air temperature
Outdoor unit inlet air temperature
Notes : *2 CHARGELESS
• No additional refrigerant required.
• This air conditioner accepts a connection piping length of up to 10m and a head of up to 5m.
• There is no need to add the refrigerant as long as the total length of the connection piping is up to 10m.

– 6 –
2. CONSTRUCTION VIEWS
2-1. Indoor Unit
RAS-10SKH-E
RAS-10SKHX
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,
,,,,,,,
,,,,,,,
,,,,,,,
,,,,,,,
,,,,,,,
,,,,,,,
,,,,,,,
,,,,,,,
,,,,,,,
,,,,,,,
,,,,,,,
,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,,
,,,,,,
,,,,,,
,,,,,,
,,,,,,
,,,,,,
,,,,,,
,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,
,,,,,,
,,,,,,
@@@@@@
@@@@@@
@@@@@@



ÀÀÀÀÀÀ
ÀÀÀÀÀÀ
ÀÀÀÀÀÀ
,,,,,,,,
,,,,,,,,
,,,,,,,,
,,,,,,,,
,,,,,,,,
,,,,,,,,
,,,,,,,,
,,,,,,,,
,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
,,,,,,,,,,,,,,,,
Air filter 790 Heat exchanger
Air inlet
265
Air outlet 47
10 50
174
47
10 50
Wireless
remote
control
55 16
559.6
Remote
control
holder
112.8 136
Knock out system
790
232 326 232
Hanger
321
Drain hose (0.54m)
Connecting pipe (0.39m) (Flare ø6.35)
(Flare ø9.52)
Hanger
65965.5
326
450
65.5
For stud bolt
(ø8~ø10)
For stud bolt
(ø6)
Hanger
Minimum
distance to wall
Minimum
distance
to ceiling
265
Knock out system
Front panel
Back body
20 2037
40.5
60.5
790 12626931976
Center line Installation
plate outline
HangerHanger
40.5
3.5
Hanger
Minimum
distance
to wall
17 20
46
120 or more 120 or more
66 or more
2.5
Connecting pipe (0.49m)
1800 10SKH-E : Without power cord
10SKHX : With power cord

– 7 –
2-2. Outdoor Unit
RAS-10SAH-E
RAS-10SAHX
600 85
36 111 ø25 Drain hole
50
30
216 230
8-ø6 Holes
(For fixing the outdoor unit)
4-ø11x14 Long holes
(For anchor bolt ø8-ø10)
Gas side (flare ø9.52)
Liquid side (flare ø6.35)
111
A
600
R10
50
36
25
216 230
ø11x14 Hole ø6 Hole
Handle
11
525 530
5
268
Fan guard
ø420
TOSHIBA
770 59
89
200
11
12
Electric
parts cover
Z
54 62
Access for
charging
250
Z
View
600
45 or more
Inlet port
600 or more
(Minimum distance
of the wall)
4-ø11x14 Long holes
(For anchor bolt ø8-ø10)
200 or more
Outlet
port
Center
port
230
100 or more
Inlet port Visible outline
of the product
A
Detail Drawing
Mounting dimension of anchor bolt
268
770
59
89

– 8 –
3. WIRING DIAGRAM
123456789
123456789
123456789 12
1212
12
L
N
1234
44
3
2
11
1
2
3
4
65
IC
FAN MOTOR
BLK
WHI
PNK
WHI
BLK BLK
RED
SOLENOID
COIL
RED
RUNNING
CAPACITOR
RUNNING
CAPACITOR
BLK
OVER LOAD
RELAY GRN & YEL
CHASSIS
INDOOR
OUTDOOR
BLK
WHI
RED
BLU
GRN&YEL
CN27
GRN&YEL P04
BLK
BRW
BLU
PNK YEL
ORN
RED BRW GRY GRY
BLU
CN04 CN07 CN10
BLU
CN03 CN01
CN13
CN25
BLK BLK BLK BLK
IC01
IC02
C06
DC35V
DC12V
DC7V
DC0V
T01
MAIN P.C. BOARD
MCC-713
C02
DB01
R01
C01
L01
C15
IC04
R109
F01 FUSE
T3.15A
250V
R21
RY01
RY02
WHI
BLK
3
4
3
4
T02
C.T.
RY03 RY04
POWER
TERMINAL
BLOCK
INDOOR
TERMINAL
BLOCK
INFRARED RAYS RECEIVE
AND INDICATION PARTS THERMO
SENSOR
(TA)
HEAT
EXCHANGER
SENSOR
(TC)
LOUVER
MOTOR FAN MOTOR
:
:
:
:
:
:
:
:
:
:
BROWN
RED
WHITE
YELLOW
BLUE
BLACK
GRAY
PINK
ORANGE
GREEN &
YELLOW
BRW
RED
WHI
YEL
BLU
BLK
GRY
PNK
ORN
GRN&YEL
COLOR IDENTIFICATION
THERMAL FUSE
77˚C × 2
VARISTOR
3
1
1
2
3
4
651
2
3
4
51
2
3
4
5
3
1
DC
MOTOR
SG01
DSA
CR01
CR02
BLU BLU BLU BLU BLU PNK BLK WHI
R116
RAS-10SKH-E/SAH-E
220/230/240V ~
50Hz
RAS-10SKHX/SAHX
220/230/240V ~
50Hz
L
N
L
N
Model Section A
Section A
1234
COMPRESSOR
DSA : Surge absorber
C.T : Current trans
BLK
RED
BLU YEL
BLK
RED
WHI

– 9 –
Specifications
Output (Rated) 19W, 2pole, 1phase, 220/230/240V, 50Hz
10kΩat 25°C
DC390V, Secondary DC35V, 12V, 7V
Coil : DC12V 75mA, Rated AC250V 20A
10kΩat 25°C
10mH, AC 0.6A
4A, 600V
100µF, 450V
T3.15A, 250V
Coil DC12V, 33mA, Rated 1A 250V AC
4A, 600V
560V
5.6 Ω, 5W
4. SPECIFICATIONS OF ELECTRICAL PARTS
4-1. Indoor Unit
RAS-10SKH-E
RAS-10SKHX
Specifications
Output (Rated) 750W, 2pole, 1phase, 220/230/240V, 50Hz
Winding resistance (Ω)
(at 20°C)
Output (Rated) 18W, 6pole, 1phase, 220/230/240V, 50Hz
Winding resistance (Ω)
(at 20°C)
500V AC, 1.5µF
400V AC, 25µF
AC : 200/240V
U/T 6.8A (90°C), OPEN 135±5°C, CLOSE 69±11°C
No.
1
2
3
4
5
6
Type
PH120T1-4C
UE6-21SJ5P
SK-50CMP
SK-40CMP25U1
LB60012
J-MRA99269-9200
Parts name
Compressor
Fan motor (for outdoor)
Running capacitor
(for fan motor)
Running capacitor
(for compressor)
Solenoid coil
(for 4-way valve)
Overload relay
Red-Black
4.53 White-Black 8.73
White-Black
370
Red-Black
370
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Type
ICF-35-19-3
or
TICF-35-19-3
(microprocessor)
SWT-34
TMP87CK40F
DI1U
(microprocessor)
RF-103YOR6
RBV-406
CEAUF2W101M20
MT3
AJQ1341
MA2830-FJ
15G561K
ERF-5TK5R6
CT422920S-01
Parts name
Fan motor (for indoor)
Thermo sensor
(TA-sensor)
DC-DC transformer (T01)
Microcomputer
Power relay (RY01), Com-
mon relay (RY02)
Heat exchanger sensor
(TC-sensor)
Line filter (L01)
Diode (DB01)
Capacitor (C02)
Fuse (F01)
Relay (for outdoor fan motor,
solenoid coil) (RY03, RY04)
Power supply IC (IC01)
Varistor (R21, 109)
Resistor (R01)
Current trans (T02)
4-2. Outdoor Unit
RAS-10SAH-E
RAS-10SAHX

– 10 –
5. REFRIGERANT CYCLE DIAGRAM
RAS-10SKH-E / RAS-10SAH-E
RAS-10SKHX / RAS-10SAHX
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.
Surface temp. of heat
exchanger interchanging
pipe T1 (°C)
10SKH-E
10SKHX
40.0
52.0 ~ 59.0
35.0
12.0
15.0
2.0
Standard pressure
P
(kg/cm²G)
10SKH-E
10SKHX
15.0
19 ~ 23
12.5
6.0
6.5
4.0
Outdoor
7/6
21/15
–10/–10
35/24
43/26
21/15
Heating
Cooling
50Hz
Standard
High temperature*1
Low temperature
Standard
High temperature
Low temperature
Ambient temp.
conditions DB/WB
(°C)
Fan speed
(indoor)
High
Low
High
High
High
Low
Fig. 5-1
Table 5-1
Indoor
20/–
27/–
20/–
27/19
32/23
21/15
Evaporator
Indoor unit
Cross flow fan
Optional piping kits
RB-P31BEF1 (3m)
RB-P51BEF1 (5m)
RB-P71BEF1 (7m)
Cooling Heating
4-way valve
Heating Cooling Compressor
Accumulator
Condenser
Propeller fan
Outdoor unit
Dryer
Capillary tube
ø1.7x1400
PH120T
1 -4C
Cooling
Heatin
g
Mark( )means check points of Gas Leak
O.D.:9.52mm O.D.:6.35mm
Cooling
Heating
Packed valve
(ø9.52) Packed valve (ø6.35)
0.39m
(Connecting pipe)
ø9.52
0.49m
(Connecting pipe)
ø6.35
T1
P
Refrigerant
R-22 0.74kg

– 11 –
6. MICRO-COMPUTER BLOCK DIAGRAM
Infrared Rays Signal Receiver
Current Sensor
Thermo Sensor
Functions • Louver Control • 3-minute Delay at Restart for Compressor • Motor Revolution Control • Processing (Temperature Processing) • Timer
ECONO.
Louver Direction Setting
Louver AUTO Swing
OFF TIMER Setting
ON TIMER Setting
Fan Speed Selection
Thermo Setting
Operation Mode Selection
AUTO, COOL, DRY, HEAT, FAN ONLY
Operation (START/STOP)
Relay Driver, Louver Driver
Clock Frequency
Oscillator Circuit
Heat Exchanger Sensor
Infrared
Rays Initializing Circuit
C. P. U
Main Unit Control Panel
AC220/230/240V ~ 50Hz
Remote Control
Operation
Display
Timer
Display
ECONO.
Sign Display
PRE-DEF.
Sign Display
Indoor
Fan Motor
Louver
ON/OFF Signal
4-Way Valve
ON/OFF Signal
Outdoor Fan
ON/OFF Signal
Compressor
ON/OFF Signal
RelayRelayRelay
4-Way ValveOutdoor Fan Motor
Louver
Motor
Compressor
(Compressor Current)
RelayRY02
RY01 RY03 RY04
Noise Filter
Power Supply
Circuit

– 12 –
7. OPERATION DESCRIPTIONS
7-1. FAN ONLY Operation
(MODE of the remote control : FAN ONLY)
(1) During this mode, the relay RY01 is always turned
off so that only the indoor fan is operated. RY02
is always turnd on.
1) When the FAN is set to AUTO, the indoor fan
motor operates as shown in Fig 7-1-1.
2) When the FAN is set to LOW, MED, or HIGH,
the indoor fan motor operates with a constant
in volume as listed inTable 7-1-1.
7-2. COOL Operation
(MODE of the remote control : COOL)
(1) Compressor 4-way valve, outdoor fan and
operation display are controlled as shown in Fig.
7-2-1.
Fig. 7-2-2
(3) Once the setting is made, the operation mode is
memorizedin the microcomputer so thatthe same
operation can be effected thereafter simply by
pushing the START/STOP button.
Fig. 7-1-1 Auto setting of air volume
Table 7-1-1 Manual setting of FAN SPEED
Indication of
FAN SPEED
LOW
MED
HIGH
HIGH Air volume
(m3/n)
400
500
600
(2) Once the setting is made, the operation mode is
memorizedin the microcomputer so thatthe same
operation can be effected thereafter simply by
pushing the START/STOP button.
HIGH
MED
LOW(+)
LOW
LOW
28
27
26
25
24
(Room temp. – Set temp.)
Set
temp.
Fig. 7-2-1
(2) Relays RY01 and RY02 are turned on to energize
the outdoor unit, and a cool operation is carried
out.
1) When the FAN is set to AUTO, the indoor fan
motor operates as shown in Fig 7-2-2.
2) When the FAN is set to LOW, MED, or HIGH,
the indoor fan motor operates with a constant
in volume as listed in Table 7-1-1.
(Room temp. – Set temp.)
+1
0
Set
temp.
ON
OFF
4-way valve
(RY04)
Outdoor fan
(RY03)
OPERATION
display
ON
OFF
OFF
ON ON
Compressor
(RY01)
Common relay
(RY02)
(Room temp. – Set temp.)
MED
LOW(+)
LOW
LOW
(continuous)
+4
+3
+2
+1
0
RY01
OFF
Set
temp.
Manual
FAN
According
to the set
position
HIGH
AUTO

– 13 –
7-2-1. Louver Control
(1) By pushing the SET button of the remote control
during the operation, the louver can be set to the
desired position.
And the louver position is stored in the microcom-
puter, the louvers will be set to the position
automatically atthe next operation.
(2) When the AUTO button is pushed, the louver ver-
tically swings within range of 25deg.
7-3. DRY Operation
(MODE of the remote control : DRY)
(1) Compressor 4-way valve, outdoor fan and
operation display are controlled as shown in Fig.
7-3-1.
Fig. 7-3-2
Fig. 7-3-1
• The microprocessor turns the compressor on
and off at regular intervals (4 to 6 minutes on
and/or off). During the compressor off, the
indoorfan will operate in thesuper lowposition.
• The indoor fan will operate in the AUTO
position.
(2) Thepattern of operation depending onthe relation
between room temperature and set temperature
is shown below:
Room temp.
Set temp.+1
Set temp.
Compressor
Outdoor fan
Indoor fan L.
* S.L. S.L.L. L. S.L. L.
ON ON ON ON
OFF OFF OFF
* Super Low
(Room temp. – Set temp.)
Set
temp.
OFF ON
+3
+2
+1
0OFF
4-way valve
(RY04)
Outdoor fan
(RY03)
OPERATION
display
Compressor
(RY01)
Common relay
(RY02)
ON:6min. OFF:4min.
ON:5min. OFF:5min.
OFF
ON:6min. OFF:4min.
ON:5min. OFF:5min.
ON

– 14 –
7-4. HEAT Operation
(MODE of the remote control : HEAT)
(1) Relays, 4-way valve, outdoor fan and operation
display are controlled as shown in Fig. 7-4-1.
Fig. 7-4-1
(2) Relays RY01 and RY02 are turned on to energize
the outdoor unit, and a heat operation is carried
out. The indoor fan motor operates as shown in
Fig. 7-4-2, when the FAN is set to AUTO.
The motor operates with a constant air volume as
listed inTable 7-1-1, when the FAN is set to LOW,
MED, or HIGH.
Fig. 7-4-2
(3) Once the setting is made, the operation mode is
memorizedin the microcomputer so thatthe same
operation can be effected thereafter simply by
pushing the START/STOP button.
7-4-1. Louver Control
(1) By pushing the SET button of the remote control
during the operation, the louver can be set to the
desired position.
(2) When the AUTO button is pushed, the louver ver-
tically swings within range of 25deg.
And the louver position is stored in the microcom-
puter, and at the next operation, the louvers will
be set to the stored position automatically at the
next operation.
7-4-2. Cool Airflow Control
(1) If the indoor heat-exchanger temperaturedetected
by the indoor heat-exchanger sensor is 20°C or
below, the indoor fan stops and if the temperature
rises to 25°C or above, the fan is restarted.
Details are in 7-10.
0
–1 ON
OFF
ON
OFF
ON
ON ON
(Room temp. – Set temp.)
4-way valve
(RY04)
Outdoor fan
(RY03)
OPERATION
display
Compressor
(RY01)
Common relay
(RY02)
(Room temp. – Set temp.)
0
-1
-2
-3
-4
Set
temp.
MED
RY01 OFF
MED( - )
LOW(+)
LOW
FAN
Manual
AUTO
According
to the set
position

– 15 –
7-5. AUTO Operation
(MODE of the remote control : AUTO)
(1) One of the 3 modes, Cooling, Fan only and Heat-
ing is selected according to room temperature at
which operation is to start, as shown in Fig. 7-5-1.
The Fan mode will continue until room tempera-
ture reaches a level at which another mode is se-
lected.
7-5-1. Temporary Auto
When the TEMPORARY button is pushed, the set
temperature is fixed at 24°C and controlled in accor-
dance with the chart shown in Fig. 7-5-1.
Fig. 7-5-1
Cooling mode
Cooling mode
Fan only mode
Heating mode
+4
+1
–1
(The same cooling mode as the room temperature control is set at set temp. –1˚C)
The Louver moved downward.
(The same cooling mode as the room temperature control is set at set temp. –1˚C)
(Only the indoor fan operates at Low speed)
(The same heating mode as the room temperature control is set at set temp. +1˚C)
(Room temp. – Set temp.)

– 16 –
7-6. ECONO. Mode
When the ECONO. button is pushed, during COOL,
HEAT and AUTO operation, the OPERATION display
is turned off and the ECONO. display is lit and the
indoorunit operates quietly andmildly with controlling
airflow.
7-6-1. Cooling
(1) Inthe ECONO. mode, the set temp. bythe remote
control is changed automatically as shown in Fig.
7-6-1.
(2) Fan speed →LOW
7-7. Current Limit Control
The microprocessor detects the input current so as to
prevent it exceeds a specified value by means of
controlling the outdoor fan control as described in (1)
and (2).
(1) Current limit control (Cooling)
Control is performed as shown below by detect-
ing the compressor operation current with a cur-
rent sensor (C.T).
Fig. 7-6-2
+2
+1
Set temp.
1H 2H TIME0H
(˚C)
ECONO. button
is pushed
Set temp.
is changed
Set temp.
is changed
Fig. 7-6-1
7-6-2. Heating
(1) Inthe ECONO. mode, the set temp. bythe remote
control is changed automatically as shown in Fig.
7-6-2.
(2) Fan speed →LOW
-1
-2
Set temp.
1H 2H TIME0H
(˚C)
ECONO. button
is pushed
Set temp.
is changed
Set temp.
is changed
10A I 4
Input
current
9A I 3
Compressor Outdoor fan
More than I
4 continues for 3 seconds
OFF
More than I 3 continues for 5 minutes
OFF
ON
Fig. 7-7-1
(2) Current limit control (Heating)
Control is performed as shown in Fig. 7-7-2.
10A I 4
Input
current
9A I 3
8A I 2
Compressor Outdoor fan
More than I
4 continues for 3 seconds
OFF
More than I 3 continues for 5 minutes
OFF
ON OFF
ON
7.5A I 1
Fig. 7-7-2

– 17 –
7-8. High-Temperature Limit Control
(Heating Operation)
Themicroprocessordetects the indoorheat exchanger
temperature so as to prevent exceeding the
condensate pressure.
Control is performed as shown in Fig. 7-8-1.
7-10. Cool Airflow Prevention Control
(Heating Operation)
(1) Duringthe heatingoperation, the indoor fan speed
is controlled automatically in accordance with the
indoor heat exchanger temperature to prevent
blowing the cool air.
Control is performed as shown in Fig. 7-10-1.
Fig. 7-8-1
7-9. Low-Temperature Limit Control
(Cooling Operation)
Themicroprocessordetects the indoorheat exchanger
temperature so as to prevent freezing up the indoor
heat exchanger.
Control is performed as shown in Fig. 7-9-1.
Fig. 7-10-1
(2) As soon as the defrost operation starts, the indoor
fan stops.
Compressor
Less than 5˚C continues
for 5 minutes
OFF
ON
Outdoor fan
7
Heat exchanger
temperature
5
(˚C)
Fig. 7-9-1
60
53
52
(˚C)
Compressor,
Outdoor fan
OFF
ON
* 1 ····· Only outdoor fan is turned off.
* 1
Heat exchanger
temperature
According to the
set position
Indoor fan speed
30
25
20
Heat exchanger
temperature
(˚C)
U.L. (Ultra Low)
Room temp.
Set temp.
S.L (Super Low)
Room temp.
Set temp.
OFF
> <

– 18 –
7-11. Defrost Operation
During the heating operation, the outdoor heat
exchanger temperature goes down and sometimes it
is frozen.
In this case, the air conditioner stops the heating
operation and starts the defrost operation to melt ice.
7-11-1. Condition to Start the Defrost
Operation
The defrost operation starts whichever below
conditions are specified.
(1) When the cumulative compressor operation time
is longer than 40 or 90 minutes and difference
between the indoor heat exchanger temperature
and the room temperature is less than the
specified value. (This value is decided by the
microprocessor.)(Control exampleisshowninFig.
7-11-1. In case of B or C, the defrost operation
starts.)
(2) When the current limit control or the high
temperature limit control is performed for total of
90 minutes.
Fig. 7-11-1 (Indoor fan speed : M)
7-11-2. Defrost Operation Time Control
<In case of B>
(1) The heating operation is performed for at least 40
minutes.
(2) Themaximum defrost operation time is 6 minutes.
The defrost operation time for the 4th cycle is 10
minutes. (When the outdoor temperature is very
low, however, the defrost operation time is 10
minutes.)
minutes
40 minutes 40 minutes 40 minutes 40
Max 6 minutes 10 minutes
1 cycle
Heating Heating Heating Heating
Defrost Defrost Defrost Defrost
Fig.7-11-2
<In case of C>
(1) The heating operation is performed for at least 90
minutes.
(2) The defrost operation time is 10 minutes.
7-11-3. Ending Condition at Defrost
Operation
(1) When the compressor current becomes 7.5A or
more during defrost operation, the defrost opera-
tion stops and the heat operation restarts. (The
current sensor detects the compressor current.)
(2) The defrost operation continues for at most 6
minutes or 10 minutes.
DEFROST LAMP :
• During defrost operation, the PRE-DEF. lamp
is on and the indoor and outdoor fans are off.
• The compressor start protection timer is inter-
locked with the PRE-DEF. lamp. So the PRE-
DEF.lamp is off (the fans stop) for about 3 min-
utes after the START/STOP button is turned
on. When the compressor is turned on, the
PRE-DEF. lamp comes on. After the heat ex-
changer is preheated to about 30°C or higher,
the PRE-DEF.lamp goes off, and the indoor fan
starts.
Cumulative
compressor
operation time
40 90
Indoor heat exchanger temp. –Room temp.
AB
D
C
(˚C)
19
10
(
min.
)

– 19 –
7-12. Auto Restart Function
This unit is equipped with an Automatic restarting
facility which allows the unit to restart and resume the
setoperating conditionsin the event of apower supply
shutdown without the use of the hand control.
The operation will resume without warning three
minutes after the power is restored.
The Auto Restart function is set not to work on
shipment from the factory, and so it is necessary to
set it to function as required.
7-12-1. How to Set the Auto Restart
To set the Auto Restart function, proceed as follows:
Access theTEMPORARY button located in the lower
right hand corner beneath the hinged front panel of
the indoor unit (please refer to section on PARTS
NAME). The power supply to the unit must be on -
the function will not be set if the power is off.
To enable the Auto Restart function, press the
TEMPORARY button continuously for three seconds.
The unit will acknowledge the setting and beep three
times. The system will now restart automatically.
The above Auto Restart settings can be carried out:
During subsequent operation, the orange light is lit.
• The Auto Restart function will not accept an
instructionif timeroperation withthe remotecontrol
is selected.
(Please refer to the section on setting the timer or
setting the louver.)
• When the system is stand-by (not running)
• Duringlouver swing(AUTO) operation,afterrestart
bytheAutoRestart function the louverswingstops.
• When the system is operating
OPERATION
Press the TEMPORARY button
continuously more than three
seconds.
MOTION
Stand-by
↓
The system starts to operate. The green light will be lit.
↓about three seconds after
The unit beeps three times. The orange light will be lit.
↓
The system is operating. The orange light is lighting.
If the system is not required to run at this time, press theTEMPORARY
button once more or use the remote control and the unit will stop.
OPERATION
Press the TEMPORARY button
continuously more than three
seconds.
MOTION
Operating The green light is lit.
↓
The system stops to operate. The green light is turned off.
↓about three seconds after
The unit beeps three times.
↓
The system stops.
If the system is not required to stop at this time, use the remote control
and to restart.
TEMPORARY
03S
TEMPORARY
03S

– 20 –
7-12-2. How to Cancel the Auto Restart
To cancel the Auto Restart function, proceed as
follows:
Repeat the setting procedure: the unit will
acknowledge the instruction and bleep three times.
The system will now be required to manually restart
with the remote control after the main supply is turned
off.
Cancellation is carried out:
• When the system is stand-by (not running)
OPERATION
Press the TEMPORARY button
continuously more than three
seconds.
MOTION
Stand-by
↓
The system starts to operate. The orange light will be lit.
↓about three seconds after
The unit beeps three times. The green light will be lit.
↓
The system is operating.
If the system is not required to run at this time, press theTEMPORARY
button once more or use the remote control and the unit will stop.
• When the system is operating
OPERATION
Press the TEMPORARY button
continuously more than three
seconds.
MOTION
Operating The orange light is lit.
↓
The system stops to operate. The orange light is turned off.
↓about three seconds after
The unit beeps three times.
↓
The system stops.
If the system is not required to stop at this time, use the remote control
and to restart.
During subsequent operation, the green light is lighting.
7-12-3. In Case of Power Failure during the
Timer Operation
(1) If ON-TIMER operation is reserved with setting of
Auto Restart operation, it is cancelled with power
failure. (The OPERATION lamp on the main unit
goes on and off to inform of power failure.) In that
case, try to reserve ON-TIMER operation once
again.
TEMPORARY
03S
TEMPORARY
03S
(2) If OFF-TIMER operation is reserved without
setting of Auto Restart operation, the reservation
is cancelled with power failure.(The OPERATION
lamp on the main unit goes on and off to inform of
power failure.) In that case, try to reserve OFF-
TIMER operation. When Auto Restart operation
is set, OFF-TIMER reservation is also cancelled
with power failure.