Toshiba RAS-3M31SAH-E SERVICE MANUAL
SERVICE MANUAL
AIR-CONDITIONER
MULTI SPLIT WALL TYPE
FILE NO. A00-9709
PRINTED IN JAPAN, May,1997 ToMo
CONTENTS
1. SPECIFICATIONS............................................................................................................ 4
2. CONSTRUCTION VIEWS ................................................................................................ 7
2-1. Indoor Unit .................................................................................................................................. 7
2-2. Outdoor Unit ............................................................................................................................... 8
3. WIRING DIAGRAM .......................................................................................................... 9
4. SPECIFICATIONS OF ELECTRICAL PARTS ............................................................... 11
4-1. Indoor Unit ................................................................................................................................ 11
4-2. Outdoor Unit ............................................................................................................................. 12
4-2-1. Upper Outdoor Unit...............................................................................................................................12
4-2-2. Lower Outdoor Unit...............................................................................................................................12
5. REFRIGERANT CYCLE DIAGRAM............................................................................... 13
6. MICROCOMPUTER BLOCK DIAGRAM........................................................................ 15
6-1. Upper Unit ................................................................................................................................. 15
6-2. Lower Unit................................................................................................................. ................ 16
7. OPERATION DESCRIPTIONS....................................................................................... 1 7
7-1. FAN ONLY Operation ................................................................................................................ 17
7-2. COOL Operation............................................................................................................. .......... 17
7-2-1. Louver Control ......................................................................................................................................18
7-3. DRY Operation .............................................................................................................. ............ 18
7-4. HEAT Operation............................................................................................................. ........... 19
7-4-1. Louver Control ......................................................................................................................................19
7-4-2. Cool Airflow Control .............................................................................................................................19
7-5. AUTO Operation ....................................................................................................................... 20
7-5-1. Temporary Auto..................................................................................................................................... 20
7-6. ECONO. Mode ........................................................................................................................... 21
7-6-1. Cooling................................................................................................................................................... 21
7-6-2. Heating .................................................................................................................. ................................. 21
7-7. Current Limit Control............................................................................................................... 21
7-8. High-Temperature Limit Control (Heating Operation) .......................................................... 22
7-9. Low-Temperature Limit Control (Cooling Operation) .......................................................... 22
7-10. Cool Airflow Prevention Control (Heating Operation) ......................................................... 22
7-11. Defrost Operation......................................................................................................... ............ 23
7-11-1. Condition to Start the Defrost Operation............................................................................................23
7-11-2. Defrost Operation Time Control...........................................................................................................23
7-11-3. Ending Condition at Defrost Operation ..............................................................................................23
7-12. Auto Restart Function ..................................................................................................... ........ 24
7-12-1. How to Set the Auto Restart.................................................................................................................24
7-12-2. How to Cancel the Auto Restart ..........................................................................................................25
7-12-3. In Case of Power Failure During the Timer Operation .......................................................................25
7-13. Operation Control of Lower Outdoor Unit............................................................................. 26
7-13-1. In Case of Operation in a Single Room...............................................................................................26
7-13-2. In Case of Concurrent Operation in Two Rooms................................................................................26
– 2 –
8. INSTALLATION PROCEDURE ...................................................................................... 27
8-1. Safety Cautions ........................................................................................................................ 27
8-2. Installation Diagram of Indoor and Outdoor Units ............................................................... 2 9
8-3. Installation ................................................................................................................................ 30
8-3-1. Optional Parts........................................................................................................... .............................3 0
8-3-2. Kit Parts .................................................................................................................................................31
8-4. Indoor Unit ................................................................................................................................ 32
8-4-1. Cutting a Hole and Mounting Installation Plate .................................................................................32
8-4-2. Electrical W or k.......................................................................................................................................33
8-4-3. Wiring Connection ................................................................................................................................ 3 4
8-4-4. Piping and Drain Hose Installation......................................................................................................36
8-4-5. Indoor Unit Installation .........................................................................................................................37
8-4-6. Drainage.................................................................................................................................................37
8-5. Outdoor Unit ............................................................................................................................. 38
8-5-1. Refrigerant Piping Connection ............................................................................................................3 9
8-5-2. Vacuum Pumping ..................................................................................................................................39
8-5-3. Wiring Connection ................................................................................................................................ 4 1
8-6. Others ........................................................................................................................................ 43
8-6-1. Gas Leak Test ........................................................................................................................................43
8-6-2. Test Operation .......................................................................................................................................43
8-6-3. Auto Restart Setting .............................................................................................................................43
9. TROUBLESHOOTING CHART...................................................................................... 44
9-1. What to be Prechecked First ................................................................................................... 44
9-1-1. Power Supply Voltage ...........................................................................................................................44
9-1-2. Incorrect Cable Connection between Indoor and Outdoor Units.....................................................44
9-1-3. Misleading but Good Operations.........................................................................................................45
9-2. Primary Judgement of Trouble Sources ................................................................................ 46
9-2-1. Role of Indoor Unit Controller..............................................................................................................46
9-2-2. Display of Abnormalities and Judgement of the Abnormal Spots...................................................4 6
9-3. Troubleshooting Flowcharts ................................................................................................... 50
9-3-1. Power can not be Turned on .................................................................................................................5 0
9-3-2. Power can not be Turned on after Replacing Indoor PC Board ........................................................51
9-3-3. Outdoor Unit does not Operate ...........................................................................................................51
9-3-4. Only Compressor does not Operate ...................................................................................................52
9-3-5. Only Outdoor Fan does not Operate ...................................................................................................53
9-3-6. Only 4-Way Valve does not Operate ....................................................................................................54
9-3-7. Only the Indoor Fan does not Operate................................................................................................5 5
9-4. How to Check the Remote Control (Including the Indoor PC Board) .................................56
9-4-1. How to Check the PC Board.................................................................................................................57
9-4-2. PC Board Layout (Indoor Unit).............................................................................................................59
9-4-3. PC Board Layout (Outdoor Unit)..........................................................................................................60
9-4-4. How to Reduce the Operation Time of the Anti-Restart Timer..........................................................61
10. PART REPLACEMENT.................................................................................................. 62
10-1. Indoor Unit ............................................................................................................... ................. 62
10-2. Microcomputer ......................................................................................................................... 64
10-3. Outdoor Unit ............................................................................................................................. 65
11. CAUTIONS ON REPLACEMENT OF PC BOARD ASSEMBLY .................................... 69
12. EXPLODED VIEWS AND PARTS LIST ......................................................................... 70
12-1. Indoor Unit (1)........................................................................................................................... 7 0
Indoor Unit (2)........................................................................................................................... 71
Indoor Unit (3)........................................................................................................................... 72
12-2. Outdoor Unit ............................................................................................................................. 73
– 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
(220/230/240V)
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, 10SKH-E, 13SKH-E / RAS-3M31SAH-E
Cooling Heating
220V 230V 240V 220V 230V 240V
8.45 8.50 8.50 9.60 9.65 9.70
Single
220/230/240
50
3.30/3.38/3.48 2.97/3.09/3.23
96/93/90 94/93/89
220V 230V 240V 220V 230V 240V
0.37/15.24 0.37/15.36 0.37/15.71 0.37/13.92 0.37/14.14 0.37/14.70
19+19+25
1.2+1.2+2.0
10SKH-E: 41/36/31 13SKH-E: 44/39/36
52/53/54
R-22
2.28 (0.7+0.7+0.88)
Capillary tube
10SKH-E: 9.52 13SKH-E: 12.7
Flare connection
6.35
Flare connection
15
6
16
RAS-10SKH-E RAS-13SKH-E
265
790
174
8
Finned tube
Cross flow fan
600 650
500 560
400 510
19
Polypropylene net filter (Washable)
RAS-3M31SAH-E
1125
830
300
106
Finned tube
Propeller
1830/1920/2010
28
PH120T1-4C x 2 + PH170T2-4L2
750W x 2 + 1100W x 1
Fuse, Overload relay
Yes
21 ~ 43 – 5 ~ 21
Specifications are subject to change without notice.
– 4 –
Item
Capacity *1
Power source
Power consumption
Power factor
Running current
Item
Capacity *1
Power source
Power consumption
Power factor
Running current
Item
Capacity *1
Power source
Power consumption
Power factor
Running current
Item
Capacity *1
Power source
Power consumption
Power factor
Running current
model
kW
Phase
V
Hz
kW
%
A
Indoor/Outdoor
model
kW
Phase
V
Hz
kW
%
A
Indoor/Outdoor
model
kW
Phase
V
Hz
kW
%
A
Indoor/Outdoor
model
kW
Phase
V
Hz
kW
%
A
Indoor/Outdoor
RAS-10SKH-E, 13SKH-E / RAS-3M31SAH-E
Cooling Heating
220V 230V 240V 220V 230V 240V
5.95 6.00 6.00 6.80 6.85 6.90
Single
220/230/240
50
2.28/2.33/2.39 2.08/2.16/2.25
97/94/91 95/93/90
220V 230V 240V 220V 230V 240V
0.26/10.47 0.26/10.51 0.26/10.73 0.26/9.73 0.26/9.81 0.26/10.12
RAS-10SKH-E, 10SKH-E / RAS-3M31SAH-E
Cooling Heating
220V 230V 240V 220V 230V 240V
5.0 5.0 5.0 5.6 5.6 5.6
Single
220/230/240
50
2.04/2.10/2.18 1.78/1.86/1.96
95/92/89 94/91/87
220V 230V 240V 220V 230V 240V
0.22/9.54 0.22/9.70 0.22/9.96 0.22/8.38 0.22/8.66 0.22/9.16
RAS-13SKH-E / RAS-3M31SAH-E
Cooling Heating
220V 230V 240V 220V 230V 240V
3.45 3.50 3.50 4.00 4.05 4.10
Single
220/230/240
50
1.26/1.28/1.30 1.19/1.23/1.27
98/96/92 95/95/93
220V 230V 240V 220V 230V 240V
0.15/5.70 0.15/5.66 0.15/5.75 0.15/5.54 0.15/5.48 0.15/5.54
RAS-10SKH-E / RAS-3M31SAH-E
Cooling Heating
220V 230V 240V 220V 230V 240V
2.50 2.50 2.50 2.80 2.80 2.80
Single
220/230/240
50
1.02/1.05/1.09 0.89/0.93/0.98
95/92/89 94/91/87
220V 230V 240V 220V 230V 240V
0.11/4.77 0.11/4.85 0.11/4.98 0.11/4.19 0.11/4.33 0.11/4.58
– 5 –
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
<RAS-13SKH-E / RAS-3M31SAH-E>
• No additional refrigerant required.
• This air conditioner accepts a connection piping length of up to 15m and a head of up to 6m.
• There is no need to add the refrigerant as long as the total length of the connection piping is up to 15m.
<RAS-10SKH-E / RAS-3M31SAH-E>
• This air conditioner accepts a connection piping length of up to 15m 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.
• There is need to add the refrigerant 20g/m as long as the each length of the connection piping is up to 11m to
15m.
Cooling
27°C
19°C
35°C
24°C
Heating
20°C
—
7°C
6°C
– 6 –
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2-1. Indoor Unit
RAS-10SKH-E
RAS-13SKH-E
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)
13SKH-E: (Flare ø12.7)
10SKH-E: (Flare ø9.52)
790
Hanger
321
Connecting pipe (0.49m)
(Flare ø6.35)
Front panel
Back body
47
47
Knock out system
50
10
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
– 7 –
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-3M31SAH-E
600 or more
4-φ11x14
for φ8-φ10
anchor bolt
Liquid side
Electrical
parts cover
(Flare φ6.35)
Gas side
(Flare φ12.7)
Liquid side
Electrical
parts cover
(Flare φ6.35)
Gas side
(Flare φ9.52)
Air inlet
600
Air inlet
Mounting dimension of anchor bolt
325
100 or more
φ25 Drain outlet
120
600 or more
300
Air outlet
100 or more
4-φ11x14 hole
(for φ8–φ10 anchor bolt)
8-φ6 hole
(for fixing outdoor unit)
186
Service port
54677.5
Handle
60
Service port
54545491
325 (pitch)(8.5) (8.5)
600 90 55
835 60 342
A
52.5
325
R12
600
Detail Drawing
36
50
A
23
φ 6 hole
311
325
φ11x14 hole
1125
Drain outlet
90
29
– 8 –
INDOOR UNIT
UPPER UNIT
(RAS-13SKH-E)
INDOOR UNIT
1
2
3
4
INDOOR
TERMINAL
BLOCK
BLK
WHI
RED
BLU
GRN&YEL
GRN&YEL
L
N
POWER
TERMINAL
BLOCK
BLK
P04
BRW
BLU
44
CN27
SG01
DSA
RY02
11
2
3
THERMAL FUSE
77˚C × 2
R109
VARISTOR
3
4
T02
C.T.
WHI
RY03
F01 FUSE
BLK
RY04
T3.15A
250V
3
RY01
4
CR01
CR02
LOUVER
MOTOR
GRY
GRY
3
1
CN04
1
3
R116
C15
R21
INFRARED RAYS RECEIVE
AND INDICATION PARTS
IC04
1
BLU
1
1
L01
23
BLU
2
2
CN07
4
BLU
BLU
4
3
4
3
PNK
YEL
BLU
4
6
5
5
R01
C01
56789
BLU
BLU
PNK
BLK
56789
56789
ORN
3
346
DB01
CN13
WHI
CN25
RED
2
2
BRW
1
1
C02
FAN MOTOR
DC
MOTOR
BLK
BLU
YEL
RED
WHI
4
3
5
2
1
4
3
5
2
1
CN10
MAIN P.C. BOARD
MCC-713
T01
C06
IC
IC01
2
1
CN03 CN01
2
1
BLK
BLK
THERMO
SENSOR
(TA)
DC 35V
DC 12V
DC 7V
DC 0V
IC02
2
1
2
1
BLK
BLK
HEAT
EXCHANGER
SENSOR
(TC)
COLOR IDENTIFICATION
:
BROWN
BRW
:
RED
RED
:
WHITE
WHI
:
YELLOW
YEL
:
BLUE
BLU
:
BLACK
BLK
:
GRAY
GRY
:
PINK
PNK
:
ORANGE
ORN
:
GRN&YEL
GREEN &
YELLOW
DSA : Surge absorbor
C.T : Current trans
OUTDOOR UNIT
(3M31SAH-E)
TERMINALS
OVERLOAD RELAY
THERMOSTAT FOR
COMPRESSOR
COMPRESSOR
BLK
BLK
BLK
PNK
WHI
BRW
SOLENOID
COIL
RED
CAPACITOR
1
BRW
RED
2
3
4
RED
FAN MOTOR
GRN & YEL
CHASSIS
CAPACITOR
WHI
BLK
LOWER UNIT
(RAS-10SKH-E)
BLK
GRN&YEL
L
N
POWER
TERMINAL
BLOCK
GRN & YEL
BLK
WHI
RED
BLU
INDOOR
1
2
3
TERMINAL
BLOCK
4
P04
44
CN27
SG01
DSA
BRW
BLU
RY02
11
2
3
THERMAL FUSE
VARISTOR
3
4
T02
C.T.
WHI
RY03
77˚C × 2
R109
F01 FUSE
BLK
RY04
T3.15A
250V
3
RY01
4
CR01
CR02
LOUVER
MOTOR
GRY
GRY
3
1
CN04
1
3
R116
IC04
C15
R21
INFRARED RAYS RECEIVE
AND INDICATION PARTS
1
BLU
1
1
L01
23
BLU
2
2
CN07
4
BLU
BLU
4
3
4
3
PNK
YEL
BLU
4
6
5
5
R01
C01
56789
BLU
BLU
PNK
BLK
56789
56789
ORN
3
346
DB01
CN13
WHI
RED
2
2
CN25
BRW
1
1
C02
DC
MOTOR
BLK
BLU
YEL
RED
WHI
4
3
5
2
1
4
3
5
2
1
CN10
MAIN P.C. BOARD
MCC-713
T01
C06
IC
IC01
2
1
CN03 CN01
2
1
BLK
BLK
THERMO
SENSOR
(TA)
FAN MOTOR
DC35V
DC12V
DC7V
DC0V
IC02
2
1
2
1
BLK
BLK
HEAT
EXCHANGER
SENSOR
(TC)
DSA : Surge absorbor
C.T : Current trans
GRN&YEL
L
N
POWER
TERMINAL
BLOCK
BLK
1
WHI
2
RED
3
BLU
4
BLK
P04
GRN & YEL
11
2
3
44
CN27
SG01
DSA
BRW
BLU
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
LOUVER
MOTOR
GRY
GRY
3
1
CN04
1
3
R116
IC04
C15
R21
INFRARED RAYS RECEIVE
AND INDICATION PARTS
1
BLU
1
1
L01
23
BLU
2
2
CN07
4
BLU
BLU
4
3
4
3
PNK
YEL
BLU
4
6
5
5
R01
C01
56789
BLU
BLU
PNK
BLK
56789
56789
ORN
3
346
DB01
CN13
WHI
CN25
RED
2
2
BRW
1
1
C02
DC
MOTOR
BLK
BLU
YEL
RED
WHI
4
3
5
2
1
4
3
5
2
1
CN10
MAIN P.C. BOARD
MCC-713
T01
C06
IC
IC01
2
1
CN03 CN01
2
1
BLK
BLK
THERMO
SENSOR
(TA)
FAN MOTOR
DC35V
DC12V
DC7V
DC0V
IC02
2
1
2
1
BLK
BLK
HEAT
EXCHANGER
SENSOR
(TC)
1
2
3
4
TERMINALS
1
RED
2
WHI
3
BLK
4
TERMINALS
BLK
L
RED
N
YEL & GRN
BLK
RED
WHI
BLK
BLK
RED
WHI
TRANSFORMER
BLU
YEL
ORN
FAN MOTOR
4 3
RY01
CN09
1
1
3
3
CN04
4 3
RY02
CN10
1
1
CN05
3
3
MAIN P.C. BOARD (MCC-738)
F01
R01
Fuse
5
5
3
3
SG01
300V
1
1
CN01
1
1
CN02
3
3
CN
131
03
22
3
CN08 CN07 CN06
5
5
BLK RED
BLK
RED
WHI
R02
RY06
CR04 CR02 CR01
1
3
1
3
12
RED
CAPACITOR
C01 C02
RY04
13 13
BLK BLK
UNIT B
COIL FOR
4 WAY
VALVE
UNIT A
COIL FOR
4 WAY
VALVE
RY03
OVERLOAD
RELAY
BLK
OVERLOAD
RELAY
BLK
CAPACITOR
WHI
PNK
COMPRESSOR
CAPACITOR
WHI
PNK
COMPRESSOR
CN11
1
2
3
4
5
6
7
8
RED
RED
INDOOR UNIT
UPPER UNIT
(RAS-13SKH-E)
INDOOR UNIT
1
2
3
4
INDOOR
TERMINAL
BLOCK
BLK
WHI
RED
BLU
GRN&YEL
GRN&YEL
L
N
POWER
TERMINAL
BLOCK
BLK
P04
BRW
BLU
44
CN27
SG01
DSA
RY02
11
2
3
THERMAL FUSE
77˚C × 2
R109
VARISTOR
3
4
T02
C.T.
WHI
RY03
F01 FUSE
BLK
RY04
T3.15A
250V
3
RY01
4
CR01
CR02
LOUVER
MOTOR
GRY
GRY
3
1
CN04
1
3
R116
C15
R21
INFRARED RAYS RECEIVE
AND INDICATION PARTS
IC04
1
BLU
1
1
L01
23
BLU
2
2
CN07
4
BLU
BLU
4
3
4
3
PNK
YEL
BLU
4
6
5
5
R01
C01
56789
BLU
BLU
PNK
BLK
56789
56789
ORN
3
346
DB01
CN13
WHI
CN25
RED
2
2
BRW
1
1
C02
FAN MOTOR
DC
MOTOR
BLK
BLU
YEL
RED
WHI
4
3
5
2
1
4
3
5
2
1
CN10
MAIN P.C. BOARD
MCC-713
T01
C06
IC
IC01
2
1
CN03 CN01
2
1
BLK
BLK
THERMO
SENSOR
(TA)
DC 35V
DC 12V
DC 7V
DC 0V
IC02
2
1
2
1
BLK
BLK
HEAT
EXCHANGER
SENSOR
(TC)
COLOR IDENTIFICATION
:
BROWN
BRW
:
RED
RED
:
WHITE
WHI
:
YELLOW
YEL
:
BLUE
BLU
:
BLACK
BLK
:
GRAY
GRY
:
PINK
PNK
:
ORANGE
ORN
:
GRN&YEL
GREEN &
YELLOW
DSA : Surge absorbor
C.T : Current trans
OUTDOOR UNIT
(3M31SAH-E)
TERMINALS
OVERLOAD RELAY
THERMOSTAT FOR
COMPRESSOR
COMPRESSOR
BLK
BLK
BLK
PNK
WHI
BRW
SOLENOID
COIL
RED
CAPACITOR
1
BRW
RED
2
3
4
RED
FAN MOTOR
GRN & YEL
CHASSIS
CAPACITOR
WHI
BLK
LOWER UNIT
(RAS-10SKH-E)
BLK
GRN&YEL
L
N
POWER
TERMINAL
BLOCK
GRN & YEL
BLK
WHI
RED
BLU
INDOOR
1
2
3
TERMINAL
BLOCK
4
P04
44
CN27
SG01
DSA
BRW
BLU
RY02
11
2
3
THERMAL FUSE
VARISTOR
3
4
T02
C.T.
WHI
RY03
77˚C × 2
R109
F01 FUSE
BLK
RY04
T3.15A
250V
3
RY01
4
CR01
CR02
LOUVER
MOTOR
GRY
GRY
3
1
CN04
1
3
R116
IC04
C15
R21
INFRARED RAYS RECEIVE
AND INDICATION PARTS
1
BLU
1
1
L01
23
BLU
2
2
CN07
4
BLU
BLU
4
3
4
3
PNK
YEL
BLU
4
6
5
5
R01
C01
56789
BLU
BLU
PNK
BLK
56789
56789
ORN
3
346
DB01
CN13
WHI
RED
2
2
CN25
BRW
1
1
C02
DC
MOTOR
BLK
BLU
YEL
RED
WHI
4
3
5
2
1
4
3
5
2
1
CN10
MAIN P.C. BOARD
MCC-713
T01
C06
IC
IC01
2
1
CN03 CN01
2
1
BLK
BLK
THERMO
SENSOR
(TA)
FAN MOTOR
DC35V
DC12V
DC7V
DC0V
IC02
2
1
2
1
BLK
BLK
HEAT
EXCHANGER
SENSOR
(TC)
DSA : Surge absorbor
C.T : Current trans
GRN&YEL
L
N
POWER
TERMINAL
BLOCK
BLK
1
WHI
2
RED
3
BLU
4
BLK
P04
GRN & YEL
11
2
3
44
CN27
SG01
DSA
BRW
BLU
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
LOUVER
MOTOR
GRY
GRY
3
1
CN04
1
3
R116
IC04
C15
R21
INFRARED RAYS RECEIVE
AND INDICATION PARTS
1
BLU
1
1
L01
23
BLU
2
2
CN07
4
BLU
BLU
4
3
4
3
PNK
YEL
BLU
4
6
5
5
R01
C01
56789
BLU
BLU
PNK
BLK
56789
56789
ORN
3
346
DB01
CN13
WHI
CN25
RED
2
2
BRW
1
1
C02
DC
MOTOR
BLK
BLU
YEL
RED
WHI
4
3
5
2
1
4
3
5
2
1
CN10
MAIN P.C. BOARD
MCC-713
T01
C06
IC
IC01
2
1
CN03 CN01
2
1
BLK
BLK
THERMO
SENSOR
(TA)
FAN MOTOR
DC35V
DC12V
DC7V
DC0V
IC02
2
1
2
1
BLK
BLK
HEAT
EXCHANGER
SENSOR
(TC)
1
RED
2
3
4
TERMINALS
BLK
1
RED
2
WHI
3
BLK
4
TERMINALS
BLK
L
RED
N
YEL & GRN
BLK
WHI
BLK
RED
WHI
TRANSFORMER
BLU
YEL
ORN
FAN MOTOR
4 3
RY01
CN09
1
1
3
3
CN04
4 3
RY02
CN10
1
1
CN05
3
3
MAIN P.C. BOARD (MCC-738)
F01
R01
Fuse
5
5
3
3
SG01
300V
1
1
CN01
1
1
CN02
3
3
CN
131
03
22
3
CN08 CN07 CN06
5
5
BLK RED
BLK
RED
WHI
R02
RY06
CR04 CR02 CR01
1
3
1
3
12
RED
CAPACITOR
C01 C02
RY04
13 13
BLK BLK
UNIT B
COIL FOR
4 WAY
VALVE
UNIT A
COIL FOR
4 WAY
VALVE
RY03
OVERLOAD
RELAY
BLK
OVERLOAD
RELAY
BLK
CAPACITOR
WHI
PNK
COMPRESSOR
CAPACITOR
WHI
PNK
COMPRESSOR
CN11
1
2
3
4
5
6
7
8
RED
RED
4-1. Indoor Unit
RAS-10SKH-E
RAS-13SKH-E
4. SPECIFICATIONS OF ELECTRICAL PARTS
No.
1
Fan motor (for indoor)
Thermo sensor
2
(TA-sensor)
DC-DC transformer (T01)
3
4
Microcomputer
Power relay (RY01), Com-
5
mon relay (RY02)
Heat exchanger sensor
6
(TC-sensor)
Line filter (L01)
7
Diode (DB01)
8
Capacitor (C02)
9
10
Fuse (F01)
Relay (for outdoor fan motor,
11
solenoid coil) (RY03, RY04)
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
Specifications
DC 35V, 19W
10kΩ at 25°C
DC390V, Secondary 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
Power supply IC (IC01)
12
Var istor (R21, R109)
13
Resistor (R01)
14
Current trans (T02)
15
16
Louver motor
MA2830-FJ
15G561K
ERF-5TK5R6
CT422920S-01
MP35EA7
4A, 600V
560V
5.6 Ω, 5W
Output (Rated) 2W, 10 poles, 1 phase DC 12V
– 11 –
– 11 –
4-2. Outdoor Unit
RAS-3M31SAH-E
4-2-1. Upper Outdoor Unit
No.
Compressor
1
Fan motor (for outdoor)
2
Running capacitor
3
(for fan motor)
Running capacitor
4
(for compressor)
Solenoid coil
5
(for 4-way va lve)
Overload relay
6
Thermostat for Compressor
7
Parts name
4-2-2. Lower Outdoor Unit
Type
PH170T2-4L2
AF-230-28P
SK-50FMP
SK-40CMP35U1
LB60012
J-MRA99257-9200
CS-7
Specifications
Output (Rated) 1,100W, 2 pole, 1 phase, 220/230/240V, 50Hz
Winding resistance (Ω)
(at 20°C)
Output (Rated) 28W, 6 pole, 1 phase, 220/230/240V, 50Hz
Winding resistance (Ω)
(at 20°C)
500V AC, 1.5µF
400V AC, 35µF
AC : 200/240V
UT 8.0A (80°C), OPEN 145±5°C, CLOSE 75±11°C
130°C OFF, 70°C ON
Red-Black
2.22
Red-Black
198
White-Black
3.04
White-Black
160
No.
Compressor
1
Fan motor (for outdoor)
2
Running capacitor
3
(for fan motor)
Running capacitor
4
(for compressor)
Solenoid coil
5
(for 4-way va lve)
Overload relay
6
Transformer
7
Outdoor PC board
8
Parts name
Type
PH120T1-4C
AF-230-28P
SK-45FMP
SK-40CMP25U1
LB60012
J-MRA99269-9200
FT-70
MCC-738
Specifications
Output (Rated) 750W, 2 pole, 1 phase, 220/230/240V, 50Hz
Winding resistance (Ω)
(at 20°C)
Output (Rated) 28W, 6 pole, 1 phase, 220/230/240V, 50Hz
Winding resistance (Ω)
(at 20°C)
450V AC, 2µF
400V AC, 25µF
AC : 200/240V
U/T 6.8A (90°C), OPEN 135±5°C, CLOSE 69±11°C
AC : 220/240V
Red-Black
4.53
Red-Black
198
White-Black
8.73
White-Black
160
– 12 –
5. REFRIGERANT CYCLE DIAGRAM
RAS-13SKH-E
RAS-3M31SAH-E (Upper Unit)
Cooling
Indoor Unit
Heat exchanger
T1
(Note)
Maximum pipe length is 15m
Maximum pipe head is 6m
0.49m
(Connecting pipe)
ø12.7
O.D.:12.7mm O.D.:6.35mm
Cooling
Heating
Heating
P
Packed valve
(ø12.7)
Gas container connection (Reinstall etc.)
Heating
4-way valve
Cooling
Cooling
Heating
Compressor
Accumulator
PH170T2-4L2
Heat exchanger
Propeller fan
Cross flow fan
Outdoor Unit
Packed valve
(ø6.35)
Capillary tube
ø0.6x1500
Capillary tube
ø1.7x400
Mark ( ) means check points of Gas Leak
Capillary tube
ø1.2x400
Refrigerant
R-22 0.88kg
0.39m
(Connecting pipe)
ø6.35
Fig. 5-1
Table 5-1
Surface temp. of heat
exchanger interchanging
pipe T1 (°C)
13SKH-E
43.0
52.0 ~ 59.0
35.0
10.0
14.0
2.0
Fan speed
(indoor)
High
Low
High
High
High
Low
Heating
Cooling
50Hz
Standard
High temperature*1
Low temperature
Standard
High temperature
Low temperature
Standard pressure
P
(kg/cm²G)
13SKH-E
15.0
19 ~ 23
12.5
5.0
6.0
4.0
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.
*
– 13 –
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
RAS-10SKH-E, RAS-10SKH-E
RAS-3M31SAH-E (Lower Unit)
Indoor Unit
Indoor heat exchanger A
Indoor heat exchanger B
Packed valve Packed valve
(3/8) (1/4)
Heating
Cooling
PH120T1-4C
Accumulator
50Hz
Standard
High temperature*1
Low temperature
Standard
High temperature
Low temperature
4-way valve
PH120T1-4C
Outdoor heat exchanger
Outdoor Unit
Standard pressure
P
(kg/cm²G)
10SKH-E
15.0
19 ~ 23
12.5
6.0
6.5
4.0
Check
valve
CompressorCompressor
Fig. 5-2
Table 5-2
Surface temp. of heat
exchanger interchanging
pipe T1 (°C)
10SKH-E
40.0
52.0 ~ 59.0
35.0
12.0
15.0
2.0
Capillary
for heating
ø1.7x300
Capillary
for cooling & heating
ø1.7x700
Dryer
Fan speed
(indoor)
High
Low
High
High
High
Low
Cooling
Heating
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
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.
*
– 14 –
6. MICROCOMPUTER BLOCK DIAGRAM
6-1. Upper Unit
RAS-13SKH-E / RAS-3M31SAH-E
Operation
C. P. U
Functions
Timer
Display
• 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
Signal
Louver
ON/OFF
Signal
ON/OFF
4-Way Valve
Signal
ON/OFF
Outdoor Fan
Signal
ON/OFF
Compressor
Motor
Louver
Relay
Relay
RY01 RY03 RY04
Relay Driver, Louver Driver
Relay
4-Way ValveOutdoor Fan MotorCompressor
RY02
Relay
Main Unit Control Panel
Current Sensor
Thermo Sensor
Heat Exchanger Sensor
Initializing Circuit
(Compressor Current)
Infrared Rays Signal Receiver
Oscillator Circuit
Clock Frequency
Rays
Infrared
Remote Control
Power
Circuit
Supply
Thermo Setting
Fan Speed Selection
Operation Mode Selection
Operation (START/STOP)
AUTO, COOL, DRY, HEAT, FAN ONLY
– 15 –
Noise Filter
ON TIMER Setting
OFF TIMER Setting
ECONO.
Louver AUTO Swing
Louver Direction Setting
AC220/230/240V ~
50Hz
6-2. Lower Unit
RAS-10SKH-E / RAS-3M31SAH-E
50Hz
ON/OFF Signal
Compressor (A)
C. P. U
4-Way
Valve (A)
RY03
Relay
Relay
Driver
ON/OFF Signal
Compressor (B)
ON/OFF Signal
4-Way Valve (A)
4-Way
Valve (B)
RY04
Relay
Outdoor Fan
ON/OFF Signal
4-Way Valve (B)
Outdoor
Fan Motor
RY06
Relay
ON/OFF Signal
Circuit
Initializing
Oscillator Circuit
Clock Frequency
• Compressor (A), (B) Control
• 4-Way Valve (A), (B) Control
• Outdoor Fan Control
• Defrost Control
Circuit
Power Supply
AC 220/230/240V
Transformer
Relay
ON/OFF Signal
Compressor (A)
RY01
ON/OFF Signal
4-Way Valve (A)
Compressor (A)
Indoor
Unit (A)
Outdoor Fan
ON/OFF Signal
Compressor (B)
– 16 –
RY02
Relay
ON/OFF Signal
ON/OFF Signal
4-Way Valve (B)
Compressor (B)
Indoor
Unit (B)
Outdoor Fan
ON/OFF Signal
Note:
If unit (A) and (B) operation modes are different (as Cool, Heater Auto), operating priority is
given for “Heat” mode unit, and “Cool” mode unit will be stopped due to overload relay actuate.
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. 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 in Table 7-1-1.
28
27
Room temp.
26
25
24
Fig. 7-1-1 Auto setting of air volume
Table 7-1-1 Manual setting of F AN SPEED
Indication of
F AN SPEED
HIGH
MED
LOW(+)
LOW
LOW
HIGH Air volume (m3/h)
13SKH-E 10SKH-E
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 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.
ON
OFF
OFF
(RY02)
(RY04)
4-way valve
Common relay
Outdoor fan
(RY03)
OPERATION
display
LOW
MED
HIGH
510 400
560 500
650 600
(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/ST OP b utton.
AUTO
+4
+3
+2
+1
(Room temp. – Set temp.)
Set
0
temp.
RY01
OFF
HIGH
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/ST OP b utton.
– 17 –
MED
LOW
LOW
FAN
Manual
According
to the set
position
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 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.
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 tur ns 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 A UT O position.
(2) The pattern of operation depending on the relation
between room temperature and set temperature
is shown below:
display
– 18 –
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) Compressor, 4-way valve, outdoor fan and
operation display are controlled as shown in Fig.
7-4-1.
0
–1
(Room temp. – Set temp.)
Fig. 7-4-1
OFF
ON ON
ON
(RY01)
Compressor
OFF
ON
ON
(RY04)
(RY02)
Common relay
(RY03)
4-way valve
Outdoor fan
OPERATION
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 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 ne xt 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 LO W ,
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/ST OP b utton.
– 19 –
7-5. AUTO Operation
(MODE of the remote control : AUTO)
(1) One of the 3 modes, Cooling, F an 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 Auto
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
– 20 –
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).
Input
current
13SKH: 13.5A
10SKH: 10.0A
13SKH: 12.5A
10SKH: 9.0A
I
4
I
3
Compressor Outdoor fan
More than I
More than I3 continues
4
continues
for 3 seconds
OFF
for 5 minutes
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
13SKH: 13.5A
10SKH: 10.0A
13SKH: 12.5A
10SKH: 9.0A
13SKH: 10.0A
10SKH: 8.0A
13SKH: 9.0A
10SKH: 7.5A
Compressor Outdoor fan
More than I
I
4
I
3
I
2
I
1
More than I3 continues
4
continues
for 3 seconds
OFF
for 5 minutes
OFF
ON OFF
ON
Fig. 7-7-2
Fig. 7-6-2
– 21 –
7-8. High-Temperature Limit Control
(Heating Operation)
7-10. Cool Airflow Prevention Contr ol
(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 Contr ol
(Cooling Operation)
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 and 7-9-
2.
<RAS-13SKH-E>
Heat exchanger
temperature
(˚C)
6
2
Compressor
Less than 2˚C continues
Outdoor fan
ON
for 5 minutes
OFF
(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 and
7-10-2.
<RAS-13SKH-E>
Heat exchanger
temperature
(˚C)
35
32
30
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
< RAS-10SKH-E>
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. 7-10-2
(2) As soon as the defrost operation starts, the in-
door fan stops.
< RAS-10SKH-E>
Heat exchanger
temperature
(˚C)
7
5
Fig. 7-9-1
Compressor
Less than 5˚C continues
Fig. 7-9-2
Outdoor fan
ON
for 5 minutes
OFF
– 22 –
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 perf ormed 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 perfo rmed 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
– 23 –
DEFROST LAMP :
• During defrost operation, the PRE-DEF . lamp is
on and the indoor and outdoor fans are off .
• The compressor star t protection timer is interlocked with the PRE-DEF. lamp. So the PREDEF. lamp is off (the f ans stop) for 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
fan starts.
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