Toshiba RAS-10SKH-X, RAS-10SKH-E, RAS-10SAH-E SERVICE MANUAL
TO SH IB A
SERVICE M ANUAL
AIR-CONDITIONER
SPLIT W A LL TY PE
FILE N O . A 00-9619
RAS-10SKH-E
RAS-10SKHX
RAS-10SAH-E
RAS-10SAHX
P R IN T E D IN JAPA N , N ov.,1996 T oM o
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. T emporary 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
– 2 –
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 ...................................................................................................4 4
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 ...................................................................................................................................5 1
9-4-3. How to Reduce the Operation Time of the Anti-Restart Timer .........................................................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
– 3 –
1. SPECIFICATIONS
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
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
Model
kW
*1
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
RAS-10SKH-E/10SAH-E, RAS-10SKHX/10SAHX
COOLING
220V
2.65
220V
0.11/4.58
230V
2.68
0.98/0.99/1.02
95/92/90
230V
0.11/4.57
Polypropylene net filter (Washable)
21 ~ 43
240V
2.70
220/230/240
240V
0.11/4.61
Capillary tube
Flare connection
Flare connection
RAS-10SKH-E/RAS-10SKHX
Finned tube
Cross flow fan
RAS-10SAH-E/RAS-10SAHX
Finned tube
PH120T1-4C
Fuse, Overload relay
220V
3.00
Single
50
220V
0.11/4.17
19
1.2
41/36/31
47/48/49
R-22
0.74
9.52
6.35
10
5
16
265
790
174
8
600
500
400
19
530
770
200
31
Propeller
1600
18
750
Yes
HEATING
230V
3.05
0.89/0.90/0.91
95/92/88
230V
0.11/4.16
– 5 ~ 21
240V
3.10
240V
0.11/4.22
Specifications are subject to change without notice.
– 4 –
Note : *1
• Capacity is based on the following temperature conditions.
JIS C9612-1994Condition
Temperature
(DB)
Indoor unit inlet air temperature
(WB)
(DB)
Outdoor unit inlet air temperature
(WB)
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.
Cooling
27°C
19°C
35°C
24°C
Heating
20°C
12°C
7°C
6°C
– 5 –
2-1. Indoor Unit
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RAS-10SKH-E
RAS-10SKHX
Air inlet
2. CONSTRUCTION VIEWS
Air filter
790
Heat exchanger
174
265
Air outlet
232 326 232
Drain hose (0.54m)
Hanger
Connecting pipe (0.39m)
(Flare ø9.52)
790
Hanger
321
1800
10SKH-E : Without power cord
10SKHX : With power cord
Connecting pipe (0.49m)
(Flare ø6.35)
Front panel
Back body
47
50
10
47
Knock out system
Knock out system
50
10
65965.5
450
Hanger
326
66 or more
Minimum
distance
2.5
46
Minimum
distance
17 20
265
to wall
120 or more 120 or more
3.5
40.5
Center line
to ceiling
Installation
plate outline
HangerHanger
790
– 6 –
12626931976
65.5
Hanger
For stud bolt
(ø8~ø10)
For stud bolt
(ø6)
Minimum
distance to wall
20 2037
40.5
60.5
Wireless
remote
control
Remote
control
holder
55
136
16
112.8
559.6
2-2. Outdoor Unit
RAS-10SAH-E
RAS-10SAHX
Detail Drawing
A
600
36
50
216
230
25
ø11x14 Hole
Handle
R10
ø6 Hole
11
A
230
216
30
Fan guard
36
50
600 85
111
ø25 Drain hole
8-ø6 Holes
(For fixing the outdoor unit)
4-ø11x14 Long holes
(For anchor bolt ø8-ø10)
111
Gas side (flare ø9.52)
Liquid side (flare ø6.35)
200
12
11
525
5
530
ø420
268
89
59
TOSHIBA
770 59
770
268
89
Electric
parts cover
Z
54 62
Access for
charging
250
230
Inlet port
100 or more
View
Z
600
Inlet port
45 or more
Visible outline
of the product
Outlet
port
Center
200 or more
Mounting dimension of anchor bolt
port
600 or more
(Minimum distance
of the wall)
4-ø11x14 Long holes
(For anchor bolt ø8-ø10)
– 7 –
3. WIRING DIAGRAM
Model Section A
RAS-10SKH-E/SAH-E
220/230/240V ~
50Hz
RAS-10SKHX/SAHX
220/230/240V ~
50Hz
GRN&YEL
Section A
L
N
POWER
TERMINAL
BLOCK
BLK
BRW
CN27
L
N
P04
BLU
44
11
2
3
L
N
SG01
DSA
RY02
T02
C.T.
WHI
THERMAL FUSE
77˚C × 2
R109
VARISTOR
F01 FUSE
T3.15A
250V
3
3
RY01
4
4
BLK
RY03
RY04
CR01
CR02
GRY
1
1
R21
LOUVER
MOTOR
GRY
3
3
CN04
CN07
BLU
6
6
R116
IC04
C01
C15
L01
4
23
BLU
2
2
56789
BLU
BLU
4
56789
3
4
56789
3
BLU
BLU
1
BLU
1
1
INFRARED RAYS RECEIVE
AND INDICATION PARTS
PNK
5
5
R01
PNK
YEL
4
4
BLK
ORN
RED
3
2
3
2
DB01
CN13
WHI
CN25
BRW
1
1
C02
FAN MOTOR
DC
MOTOR
BLK
BLU
YEL
WHI
5
5
RED
4
3
2
1
4
3
2
1
CN10
MAIN P.C. BOARD
MCC-713
T01
C06
IC
IC01
2
1
CN03 CN01
2
1
BLK
BLK
THERMO
SENSOR
(TA)
EXCHANGER
DC35V
DC12V
DC7V
DC0V
IC02
2
1
2
1
BLK
BLK
HEAT
SENSOR
(TC)
OVER LOAD
COMPRESSOR
RELAY
BLK
INDOOR
TERMINAL
BLOCK
BLK
RED
CAPACITOR
PNK
WHI
BLK
SOLENOID
COIL
RUNNING
BLK
1
1
BLK
RED
WHI
2
2
RED
RED
BLU
GRN&YEL
3
4
3
4
GRN & YEL
CHASSIS
RUNNING
CAPACITOR
FAN MOTOR
INDOOR
OUTDOOR
WHI
BLK
– 8 –
DSA : Surge absorber
C.T : Current trans
COLOR IDENTIFICATION
:
BRW
:
RED
:
WHI
:
YEL
:
BLU
:
BLK
:
GRY
:
PNK
:
ORN
GRN&YEL
:
BROWN
RED
WHITE
YELLOW
BLUE
BLACK
GRAY
PINK
ORANGE
GREEN &
YELLOW
4-1. Indoor Unit
RAS-10SKH-E
RAS-10SKHX
4. SPECIFICATIONS OF ELECTRICAL PARTS
No.
1
Fan motor (for indoor)
Thermo sensor
2
(TA-sensor)
3
DC-DC transformer (T01)
4
Microcomputer
Power relay (RY01), Com-
5
mon relay (RY02)
Heat exchanger sensor
6
(TC-sensor)
7
Line filter (L01)
8
Diode (DB01)
9
Capacitor (C02)
10
Fuse (F01)
Relay (for outdoor fan motor,
11
solenoid coil) (RY03, RY04)
12
Power supply IC (IC01)
13
Varistor (R21, 109)
14
Resistor (R01)
15
Current trans (T02)
Parts name
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
Specifications
Output (Rated) 19W, 2pole, 1phase, 220/230/240V, 50Hz
10kΩ at 25°C
DC390V, Secondar y DC35V, 12V, 7V
Coil : DC12V 75mA, Rated AC250V 20A
10kΩ at 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
4-2. Outdoor Unit
RAS-10SAH-E
RAS-10SAHX
No.
1
Compressor
2
Fan motor (for outdoor)
Running capacitor
3
(for fan motor)
Running capacitor
4
(for compressor)
Solenoid coil
5
(for 4-way valve)
6
Overload relay
Parts name
Type
PH120T1-4C
UE6-21SJ5P
SK-50CMP
SK-40CMP25U1
LB60012
J-MRA99269-9200
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
Red-Black
4.53
Red-Black
370
White-Black
White-Black
– 9 –
8.73
370
5. REFRIGERANT CYCLE DIAGRAM
g
RAS-10SKH-E / RAS-10SAH-E
RAS-10SKHX / RAS-10SAHX
Cooling
Indoor unit
Evaporator
T1
0.39m
(Connecting pipe)
ø9.52
O.D.:9.52mm O.D.:6.35mm
Cooling
Heating
Heating
Packed valve
Heating
4-way valve
Cooling
Cooling
Heatin
P
(ø9.52)
Compressor
PH120T
Accumulator
Propeller fan
Outdoor unit
Cross flow fan
Optional piping kits
RB-P31BEF1 (3m)
RB-P51BEF1 (5m)
RB-P71BEF1 (7m)
1
-4C
Condenser
Packed valve
(ø6.35)
Capillary tube
ø1.7x1400
Dryer
Refrigerant
R-22 0.74kg
Mark( )means check points of Gas Leak
0.49m
(Connecting pipe)
ø6.35
Fig. 5-1
Table 5-1
Heating
Cooling
50Hz
Standard
High temperature*1
Low temperature
Standard
High temperature
Low temperature
Standard pressure
P
(kg/cm²G)
10SKH-E
10SKHX
15.0
19 ~ 23
12.5
6.0
6.5
4.0
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
Fan speed
(indoor)
High
Low
High
High
High
Low
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.
*
– 10 –
Ambient temp.
conditions DB/WB
(°C)
Indoor
20/–
27/–
20/–
27/19
32/23
21/15
Outdoor
7/6
21/15
–10/–10
35/24
43/26
21/15
6. MICRO-COMPUTER BLOCK DIAGRAM
Operation
C. P. U
Timer
Display
Functions
• Louver Control
Display
ECONO.
Sign Display
• 3-minute Delay at Restart for Compressor
PRE-DEF.
Sign Display
• Motor Revolution Control
Indoor
Fan Motor
• Processing
(Temperature Processing)
• Timer
Louver
ON/OFF Signal
4-Way Valve
ON/OFF Signal
Outdoor Fan
ON/OFF Signal
Compressor
ON/OFF Signal
Motor
Louver
RelayRelayRelay
Relay Driver, Louver Driver
RY01 RY03 RY04
4-Way ValveOutdoor Fan Motor
Compressor
RY02
Relay
Main Unit Control Panel
Current Sensor
Thermo Sensor
Heat Exchanger Sensor
Initializing Circuit
Infrared
(Compressor Current)
Infrared Rays Signal Receiver
Oscillator Circuit
Clock Frequency
Rays
Remote Control
Operation (START/STOP)
Circuit
Power Supply
Thermo Setting
Operation Mode Selection
AUTO, COOL, DRY, HEAT, FAN ONLY
Noise Filter
ON TIMER Setting
Fan Speed Selection
OFF TIMER Setting
– 11 –
ECONO.
Louver AUTO Swing
Louver Direction Setting
AC220/230/240V ~
50Hz
7. OPERATION DESCRIPTIONS
7-1. FAN ONLY Operation
(MODE of the remote control : FAN ONLY)
(1) During this mode, the relay R Y01 is always turned
off so that only the indoor fan is operated. RY 02
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 in Table 7-1-1.
28
27
26
25
(Room temp. – Set temp.)
Set
24
temp.
Fig. 7-1-1 Auto setting of air volume
Table 7-1-1 Manual setting of FAN SPEED
Indication of
FAN SPEED
HIGH
MED
LOW(+)
LOW
LOW
HIGH Air volume
(m3/n)
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.
+1
(Room temp. – Set temp.)
Set
0
temp.
ON
ON ON
OFF
(RY01)
Compressor
Fig. 7-2-1
(2) Relays R Y01 and R Y02 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.
ON
OFF
OFF
(RY02)
(RY04)
4-way valve
Common relay
Outdoor fan
(RY03)
OPERATION
display
LOW
MED
HIGH
400
500
600
(2) Once the setting is made, the operation mode is
memorized in the microcomputer so that the same
operation can be effected thereafter simply by
pushing the START/STOP button.
– 12 –
FAN
Manual
According
to the set
position
+4
+3
+2
+1
(Room temp. – Set temp.)
Set
0
temp.
RY01
OFF
AUTO
HIGH
MED
LOW(+)
LOW
LOW
(continuous)
Fig. 7-2-2
(3) Once the setting is made, the operation mode is
memorized in the microcomputer so that the same
operation can be effected thereafter simply by
pushing the START/STOP button.
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 microcomputer, the louvers will be set to the position
automatically at the next operation.
(2) When the AUT O b utton is pushed, the louv er v er-
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.
ON:6min.
+3
ON:6min.
OFF:4min.
OFF:4min.
+2
+1
(Room temp. – Set temp.)
Set
0
temp.
ON
ON:5min.
OFF:5min.
OFF
(RY01)
Compressor
Common relay
OFF
OFF
(RY04)
(RY02)
4-way valve
ON
ON:5min.
OFF:5min.
(RY03)
Outdoor fan
OPERATION
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
indoor fan will operate in the super low position.
• The indoor fan will operate in the AUTO
position.
(2) The pattern of operation depending on the relation
between room temperature and set temperature
is shown below:
display
– 13 –
Room temp.
Set temp.+1
Set temp.
Compressor
Outdoor fan
Indoor fan
ON ON ON ON
OFF OFF OFF
L.*S.L. S.L.L. L. S.L. L.
*
Super Low
Fig. 7-3-2
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.
0
OFF
ON
ON
(RY04)
(RY02)
Common relay
(RY03)
4-way valve
Outdoor fan
OPERATION
–1
(Room temp. – Set temp.)
Fig. 7-4-1
OFF
ON ON
ON
(RY01)
Compressor
display
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 AUT O b utton is pushed, the louv er v er-
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 temperature detected
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.
(2) Relays R Y01 and R Y02 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 in Table 7-1-1, when the F AN is set to LOW,
MED, or HIGH.
RY01 OFF
Set
0
temp.
-1
-2
-3
-4
(Room temp. – Set temp.)
AUTO
LOW
LOW(+)
MED(-)
MED
FAN
Manual
According
to the set
position
Fig. 7-4-2
(3) Once the setting is made, the operation mode is
memorized in the microcomputer so that the same
operation can be effected thereafter simply by
pushing the START/STOP button.
– 14 –
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 temperature reaches a level at which another mode is selected.
7-5-1. Temporary Au to
When the TEMPORARY button is pushed, the set
temperature is fixed at 24°C and controlled in accordance with the chart shown in Fig. 7-5-1.
Cooling mode
+4
Cooling mode
+1
Fan only mode
–1
Heating mode
(Room temp. – Set temp.)
(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)
Fig. 7-5-1
– 15 –
7-6. ECONO. Mode
7-7. Current Limit Control
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
indoor unit operates quietly and mildly with controlling
airflow .
7-6-1. Cooling
(1) In the ECONO. mode, the set temp. by the remote
control is changed automatically as shown in Fig.
7-6-1.
(2) Fan speed → LOW
(˚C)
Set temp.
is changed
+2
Set temp.
is changed
+1
Set temp.
ECONO. button
is pushed
1H 2H TIME0H
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 detecting the compressor operation current with a current sensor (C.T).
Compressor Outdoor fan
4
Input
current
10A I
9A I
More than I
4
3
More than I3 continues for 5 minutes
continues for 3 seconds
OFF
OFF
ON
Fig. 7-7-1
(2) Current limit control (Heating)
Control is performed as shown in Fig. 7-7-2.
Fig. 7-6-1
7-6-2. Heating
(1) In the ECONO. mode, the set temp. by the remote
control is changed automatically as shown in Fig.
7-6-2.
(2) Fan speed → LOW
ECONO. button
is pushed
1H 2H TIME0H
Set temp.
-1
Set temp.
is changed
-2
Set temp.
is changed
(˚C)
Input
current
10A I
9A I
8A I
7.5A I
Compressor Outdoor fan
More than I
4
3
2
1
More than I3 continues for 5 minutes
4
continues for 3 seconds
OFF
OFF
ON OFF
ON
Fig. 7-7-2
Fig. 7-6-2
– 16 –
7-8. High-Temperature Limit Control
(Heating Operation)
7-10. Cool Airflow Prevention Control
(Heating Operation)
The microprocessor detects the indoor heat exchanger
temperature so as to prevent exceeding the
condensate pressure.
Control is performed as shown in Fig. 7-8-1.
Heat exchanger
temperature
(˚C)
60
*
1
53
52
*
1 ····· Only outdoor fan is turned off.
Compressor,
Outdoor fan
OFF
ON
Fig. 7-8-1
7-9. Low-Temperature Limit Control
(Cooling Operation)
(1) During the heating operation, 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.
Heat exchanger
temperature
(˚C)
30
25
20
Indoor fan speed
According to the
set position
U.L. (Ultra Low)
Room temp.
<
Set temp.
OFF
Room temp.
>
Set temp.
S.L (Super Low)
Fig. 7-10-1
(2) As soon as the defrost operation starts, the indoor
fan stops.
The microprocessor detects the indoor heat exchanger
temperature so as to prevent freezing up the indoor
heat exchanger.
Control is performed as shown in Fig. 7-9-1.
Heat exchanger
temperature
(˚C)
7
5
Compressor
Less than 5˚C continues
Outdoor fan
ON
for 5 minutes
OFF
Fig. 7-9-1
– 17 –
7-11. Defrost Operation
minutes40minutes40minutes40minutes
40
Max 6 minutes 10 minutes
1 cycle
Heating
Heating
Heating
Heating
Defrost
Defrost
Defrost
Defrost
(
)
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 e xample is shown in Fig.
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.
(˚C)
D
19
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 operation 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.
10
Indoor heat exchanger temp.
–Room temp.
A
40 90
B
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) The maximum 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.)
C
min.
Cumulative
compressor
operation time
– 18 –
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 interlocked with the PRE-DEF. lamp. So the PREDEF. lamp is off (the fans stop) f or about 3 minutes after the START/STOP button is turned
on. When the compressor is turned on, the
PRE-DEF. lamp comes on. After the heat exchanger is preheated to about 30°C or higher,
the PRE-DEF. lamp goes off, and the indoor f an
starts.
7-12. Auto Restart Function
This unit is equipped with an Automatic restarting
facility which allows the unit to restart and resume the
set operating conditions in the event of a power 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.
• When the system is stand-by (not running)
7-12-1. How to Set the Auto Restart
To set the Auto Restart function, proceed as follows:
Access the TEMPORARY 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 contin uously f or three seconds.
The unit will acknowledge the setting and beep three
times. The system will now restart automatically.
The above A uto Restart settings can be carried out:
OPERATION
Press the TEMPORARY button
continuously more than three
seconds.
0
TEMPORARY
• When the system is operating
OPERATION
Press the TEMPORARY button
continuously more than three
seconds.
0
TEMPORARY
MOTION
Stand-by
↓
The system starts to operate. The green light will be lit.
↓ about three seconds after
3S
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 the TEMPORARY
button once more or use the remote control and the unit will stop.
MOTION
Operating The green light is lit.
↓
The system stops to operate. The green light is turned off.
↓ about three seconds after
3S
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 orange light is lit.
• The Auto Restart function will not accept an
instruction if timer operation with the remote control
is selected.
(Please refer to the section on setting the timer or
setting the louver.)
• During louver swing (A UTO) oper ation, after restart
by the Auto Restart function the louver swing stops.
– 19 –
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