Toshiba RAS-18YAH-A, RAS-18YAH-E, RAS-18YKH-A, RAS-18YKH-E SERVICE MANUAL
SERVICE MANUAL
AIR-CONDITIONER
SPLIT WALL TYPE
FILE NO. A00-0001
SUPPLEMENT
RAS-18YKH-E
RAS-18YKH-A
/
RAS-18YAH-E
/
RAS-18YAH-A
PRINTED IN THAILAND, Apr.,2000
CONTENTS
1. SPECIFICATIONS....................................................................................... 3
2. CONSTRUCTION VIEWS............................................................................ 5
3. WIRING DIA GRAM ..................................................................................... 7
4. SPECIFICATIONS OF ELECTRICAL PARTS ............................................ 8
5. REFRIGERANT CYCLE DIAGRAM............................................................ 9
6. CONTROL BLOCK DIAGRAM ................................................................. 10
7. OPERATION DESCRIPTION .................................................................... 12
8. INSTALLATION PROCEDURE ................................................................. 16
9. TROUBLESHOO TING CHART ................................................................. 20
10. EXPLODED VIEWS AND PARTS LIST .................................................... 37
– 2 –
1. SPECIFICATIONS
Model
Item
Capacity *1 (kW)
Phase
Power source (V)
(Hz)
Power consumption (kW)
Power factor (%)
Running current
Starting current (A)
Moisture removal (lit/h)
Noise
Refrigerant
Refrigerant control
Interconnection pipe
Codensate drain pipe Outer diameter (mm)
INDOOR UNIT
Dimension Width (mm)
Net weight (kg)
Evaporator type
Indoor fan type
Air volume Medium fan (m³/h)
Fan motor output (W)
Air filter
OUTDOOR UNIT
Dimension Width (mm)
Net weight (kg)
Condenser type
Outdoor fan type
Airflow volume (m³/h)
Fan motor output (W)
Compressor
Safety device
Auto louver
Usable outdoor temperature range (°C)
Indoor (A)
Outdoor (A)
Indoor (H/M/L) (dB)
Outdoor (dB)
Name of refrigerant
Rated volume (kg)
Gas side size (mm)
Connection type
Liquid side size (mm)
Connection type
Maximum length (of one way) *2(m)
Maximum height difference
Indoor unit
Outdoor unit
Height (mm)
Depth (mm)
High fan (m³/h)
Low fan (m³/h)
Height (mm)
Depth (mm)
Model
Output (W)
↑
↓
(m)
Specifications are subject to change without notice.
RAS-18YKH-E, RAS-18YAH-E RAS-18YKH-A, RAS-18YAH-A
Cooling Heating Cooling Heating
220–240V 240V
5,0 6,35–6,50 5,0 6,50
Single
220–240V 240V
50
2,03–2,20 2,33–2,52 2,20 2,52
91–81 92–85 81 85
0,28–0,30 0,28–0,30 0,30 0,30
9,82–11,00 11,22–12,10 11,00 12,10
60
2,0
44/41/38
54–56 55–57 56 57
R-22
1,45
Capillary tube
12,7
Flare connection
6,35
Flare connection
15
6
16
RAS-18YKH-E / RAS-18YKH-A
298
1050
180
12
Finned tube
Cross flow fan
750
650
550
31
Polypropylene net filter (Washable)
RAS-18YAH-E RAS-18YAH-A
690
880
310
65
Finned tube
Propeller
220V 240V 240V
3380 3560 3560
65
PH280X3-4MS
2000
Fuse, overload relay
Yes
11 to 43 –10 to 21 11 to 43 –10 to 21
– 3 –
Note : *1
• Capacity is based on the following temperature conditions.
Condition
T emperature
(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 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.
Cooling Heating
27°C 20°C
19°C —
35°C 7°C
24°C 6°C
JIS C9612-1994
– 4 –
2-1. Indoor Unit
RAS-18YKH-E, RAS-18YKH-A
Deodorizing filter
Air inlet
298
2. CONSTRUCTION VIEWS
Indoor heat exchanger
Dust collecting filter
1050
Air filter
180
Air outlet
261 264 274 251
Drain hose
0,60m
Auxiliary pipe (0,39m)
Flare Ø12,7
Power cord (1,7m)
1040
Hanger
Auxiliary pipe (0,49m)
Detail of installing dimensions of the indoor unit
30
274 264
154020
Hanger
44
Hanger
Flare Ø6,35
990
450
Minimum distance
from ceiling
or more
Front panel
Rear plate
Wireless
remote control
Remote control holder
30
Anchor bolt hole
Anchor bolt hole
55 16
112.8 136
59.6 5
Ø8 ~ Ø10
Ø6
298
248
304010
Minimum distance
from wall
80 or more
Ø65
Piping hole
123
Center line
1050
– 5 –
Installation plate
Minimum distance
from wall
130 or more
123402402
47
Ø65
Piping hole
2-2. Outdoor Unit
RAS-18YAH-E, RAS-18YAH-A
A
340
63,8
4–Ø12 x 18 hole
(for Ø8–Ø10 anchor bolt)
690
120
600
880
Ø25 Drain outlet
140
Handle
74
88
68 52
12
23
310
340 (pitch)
364
Electric
Parts cover
Liquid side
(Flare Ø6,35)
Gas side
(Flare Ø15,88)
Service port
12
Handle
Mounting dimension of anchor bolt
600
100 or more
Air inlet
340
100 or more
Air outlet
Air inlet
600 or more
600 or more
4 x Ø12 x 18 for Ø8–Ø10 anchor bolt
– 6 –
Detail Drawing
A
340
600
50
27
Ø12 x 18 hole
3. WIRING DIAGRAM
CN16
COLOR
IDENTIFICATION
BRW : BROWN
RED : RED
WHI : WHITE
YEL : YELLOW
BLU : BLUE
BLK : BLACK
GRY : GRAY
PNK : PINK
ORN : ORANGE
GRN & YEL: GREEN &
ORANGE
Indoor terminal block
Outdoor terminal block
Power supply
18YAH-E : 220–240V ~, 50Hz
18YAH-A : 240V ~, 50Hz
L
N
Ferrite core
BLK
RED
GRN & YEL
BLK
RED
Switch parts
1 2 3
WHI
1
1 2 3
CN15
F01 Fuse
CN03
1
1
BLK WHI
1
BLU
2 3
T5A
250V
3 5
2
BLU
GRN
&
YEL
53
Grand
terminal
321
Chassis
CN25
TNR
R106
RED
3
GRN & YEL
Louver
Indication parts
4 5 6 7 8 9321
4 5 6 7 8 9321
WHI
BRW
BRW
BRW
4 5 6 7 8 9321
4 5 6 7 8 9321
BRW
C28
BRW
BRW
L01
Filter
BRW
BRW
C27
motor
CR01
TRIAC D04
MAIN P.C. BOARD (MCC-1293)
CN17
1 2 3
1 2 3
WHI
RED
1 2 3
1 2 3
Infrared rays
receive parts
Transformer
BLK
PJ18
Thermal fuse
BLU
YEL
RED
WHI
BLK
BLK
WHI
RED
GRY
1 1
3 3
1 1
3 3
1 1
3 3
5 5
7 7
9 9
CN26
ORN
77˚C
2
21
21
ORN
CN06
CN05
TNR R74
CN01
21
21
BLK
BLK
Thetmo.
sensor
MAIN P.C. BOARD (MCC-1275)
T5A, 250V AC
PNK
BLU
5 4 3 2 1
6
6 5 4 3 2 1
TNR R98
TH01
PTH
21
21
BLK
BLK
Heat exchanger
sensor
DSA
YEL
CN10CN24
RED
ORN
CN13
C26
Running
capacity
CN07
CN12
CN01
CN22CN05CN04
1 2
1 2
WHI
1 2
Buzzer
parts
TNR
R73
BRW
BLU
5
3
1
2
CN30
Thermal fuse
164˚C
YEL
11
GRY
22
BRW
33
WHI
5
BLK
3
RED
1
WHI
33
RED
1
CN32
GRY
33
BLU
11
CN11
CN11
T01
313
1
Fan motor
IC
MCC-629
1 1
2
3 3
1 1
2
3 3
Transformer
1
2
3131
CN33
Discharge
temperature
sensor (TD)
BLK
BLK
Heat
exchanger
sensor (TE)
BLK
BLK
Crank case
heater
1 1
2 2
RED
Fuse
BLK
3A
Fuse
3A
BLK
Capacitor Capacitor
RED
WHI
PNK
Compressor
Magnetic
relay
21
5L3
3L2
22
6T3
4T2
RED
RED
BLK BLK
WHI
A1
1L1
52C
A2
2T1
Fan motor
BLU
YEL
BLK
BLK
Coil for
4-way valve
BLU
1 1
3 3
5
1 1
3 3
1 1
3 3
1 1
– 7 –
3
CN04
CN11
CN02
CN03
CR11
CR12
RY07
RY05
TNR R96
IC07
4. SPECIFICATIONS OF ELECTRICAL PARTS
4-1. Indoor Unit
RAS-18YKH-E, RAS-18YKH-A
No. Parts name Type Specifications
Output (Rated) 31W, 2poles, DC35V, 19W
1 Fan motor (for indoor) AFP-220-31-4B
2 Thermo. sensor (TA-sensor) (microprocessor) 10kΩ at 25°C
3 Transformer (T01) TTZ MCC-629
4 Microcomputer TMP87CK40AN
5 Heat exchanger sensor (microprocessor) 10kΩ at 25°C
(TC-sensor)
6 Line filter (L01) 25mH, AC 0,7A
7 Diode (DB01) KBP06M
8 Capacitor (C01) ECAIEHG222E 220µF, 25V
9 Fuse (F01) MT3 T5A, 250V
10 Varistor (R98, R106) 15G431K 430V
11 PTH (TH01) 82Ω
12 Louver motor MP35EA7 Output (Rated) 2W, 10poles, 1phase DC12V
Winding resistance (Ω)
(at 20°C)
Red-Black White-Black
267,8 147,7
4-2. Outdoor Unit
RAS-18YAH-E, RAS-18YAH-A
No. Parts name Type Specifications
Output (Rated) 2000W, 2poles, 1phase, 220–240V, 50Hz
1 Compressor PH280X3-4MS
2 Fan motor (for outdoor) MMF-230-65C
3 Running capacitor (for fan motor) SK45FMP AC 450V, 3,5µF
4 Running capacitor SK42CMP45U1 AC 420V, 45µF
(for compressor)
5 Solenoid coil (for 4-way valve) LB60012 AC 200/240V
6 Thermo. sensor TE, TD 10kΩ at 25°C
7 Case heater 240V, 28W
8 Magnetic switch FC2S 3a1b
9 Transformer FT67 220–240V
10 Microcomputer TMP470840
11 Varistor (R73, 74, 86) 15G471K 470V
12 Fuse (F01) MT3 T5A, 250V
Winding resistance (Ω)
(at 20°C)
Output (Rated) 65W, 6poles, 1phase, 220–240V, 50Hz
Winding resistance (Ω)
(at 20°C)
Red-Black White-Black
1,35 2,68
Red-Black White-Black
71,2 139,0
– 8 –
5. REFRIGERANT CYCLE DIAGRAM
INDOOR UNIT A
T1
Cooling
0,39m
(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
Accumulator
Compressor
PH280X3-4MS
Indoor heat
exchanger
Cross flow fan
Packed valve
(Ø6,35)
Liquid tank
550cc
Capillary tube
Ø1,7 x 600
(Note)
Maximum pipe length is 15m
Maximum pipe head is 6m
0,49m
(Connecting pipe)
Ø6,35
Capillary tube
Ø1,2 x 700
Outdoor heat exchanger
Propeller fan
Cooling
Heating
Standard pressure Surface temp. of heat
50Hz
Standard 21,0 53,0 High
Heating High temperature*1 20,5 to 25,5 52,0 to 61,0 Low
Low temperature 17,0 45,0 High
Standard 3,0 9,0 High
Cooling High temperature 3,5 11,0 High
Low temperature 2,5 1,5 Low
P exchanger interchanging Fan speed
(kg/cm²G) pipe T1 (°C) (indoor)
18YAH-E, A 18YKH-E, A
OUTDOOR UNIT
Mark ( ) means check points of Gas Leak
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.
Refrigerant
R-22 1,45kg
Ambient temp.
conditions DB/WB
(°C)
Indoor Outdoor
20/– 7/6
27/– 21/15
20/– –10/–10
27/19 35/24
32/23 43/26
21/15 21/15
– 9 –
6-1. Indoor Unit
– 10 –
Heat Exchanger Sensor
Temperature Sensor
Infrared Rays Signal Receiver
CLOCK FREQUENCY 36,864kHz
Remote Control
Operation (START/STOP)
Operation Mode Selection
AUTO, COOL, DRY, FAN ONLY
Thermo. Setting
Fan Speed Selection
Infrared
Rays
Indoor Unit Control Panel
Initializing Circuit
Clock Frequency
Oscillator Circuit
8MHz
Power Supply
Circuit
M.C.U
Functions
• Louver Control
• 3-minute Delay at Restart for Compressor
• Motor Revolution Control
• Processing
(Temperature Processing)
• Timer
• Serial Signal Communication
Operation
Display
Timer
Display
6. CONTROL BLOCK DIAGRAM
ECONO.
Sign Display
PRE DEF.
Sign Display
ON TIMER Setting
OFF TIMER Setting
Louver AUTO Swing
Louver Direction Setting
From Outdoor Unit
ECONO.
Photo Triac
Noise Filter
Indoor
Fan Motor
Louver ON/OFF Signal
Louver Driver
Serial Signal Transmitter/Receiver
Transformer Serial Signal Communication (outdoor unit)
Louver
Motor
6-2. Outdoor Unit
– 11 –
TD
Discharge
Temperature
Sensor
TE
Heat
Exchanger
Sensor
Serial Signal
Communication
(Indoor Unit)
Serial Signal
Transmitter/
Receiver
C.P.U
4-Way Valve
ON/OFF Signal
Compressor
ON/OFF Signal
Outdoor Fan
ON/OFF Signal
• Compressor Control
• 4-Way Valve Control
• Outdoor Fan Control
• Defrost Operation
• Serial Signal Communication
Relay
RY05
Relay
Driver
Relay
RY07
Photo
Coupler
Initializing Circuit
Clock frequency
Oscillator Circuit
Power Supply Circuit
Triac
6MHz
4-Way
Valve
Magnetic
Switch
Outdoor
Fan Motor
Power
Supply
(for Indoor Unit)
Transformer
Compressor
RAS-18YAH-E : AC220–240V, 50Hz
RAS-18YAH-A : AC240V, 50Hz
7. OPERATION DESCRIPTION
7-1. FAN ONLY Operation
(MODE of the remote control : FAN ONLY)
(1) Fan speed setting
1) When the FAN is set to A UTO, 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 A uto setting of air volume
T a ble 7-1-1 Manual setting of FAN SPEED
Indication of HIGH Air volume
F AN SPEED (m3/h)
LOW 550
MED 650
HIGH 750
(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.
HIGH
MED
LOW(+)
LOW
LOW
7-2. COOL Operation
(MODE of the remote control : COOL)
(1) Compressor, 4-way v alve, outdoor fan and
operation display are controlled as shown in Fig.
7-2-1.
+1
Set temp.)
(Room temp. –
Set
0
temp.
Fig. 7-2-1
ON
OFF
Compressor
(2) A cool operation is carried out when the indoor
microcomputer sends the operation signal to the
outdoor microcomputer.
1) When the FAN is set to A UTO, 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.
AUTO
+1,5
+1,0
+0,5
+0
(Room temp. – Set temp.)
Set
–0,5
temp.
RY01 OFF
HIGH
MED (+)
MED
LOW (+)
LOW
Fig. 7-2-2
ON
OFFOFFON ON
4-way valve
FAN
Manual
According
to the set
position
Outdoor fan
Common relay
display
OPERATION
– 12 –
(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 louv ers will be set to the position
automatically at the next operation.
(2) When the AUT O b utton is pushed, the louv er
vertically swings within range of 25deg.
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