Toshiba RAC-08EW-E Service Manual

SERVICE MANUAL

ROOM AIR-CONDITIONER

PORTABLE TYPE

FILE NO. A00-9607

RAC-08EW-E

PRINTED IN JAPAN Mar., 1996 S

– 2 –

CONTENTS

1. SPECIFICATIONS..............................................................................................................3

2. SPECIFICATIONS OF ACCESSORIES ............................................................................. 3

3. APPEARANCE ................................................................................................................... 4

4. SPECIFICATIONS OF ELECTRICAL PARTS .................................................................... 4

5. WIRING DIAGRAM (RAC-08EW-E) .................................................................................. 5

6. COOLING CHARACTER CHART ...................................................................................... 6

7. REFRIGERATING CYCLE DIAGRAM.............................................................................. 7

8. MICROCOMPUTER BLOCK DIAGRAM ............................................................................ 8

9. OPERATION DESCRIPTIONS........................................................................................... 9

9-1. Operation Control Knobs on Control Panel ........................................................................................ 9

10. OUTLINE OF OPERATIONS .......................................................................................... 10

10-1. Basic Operation................................................................................................................................ 10

10-2. Economy Mode ................................................................................................................................ 10

10-3. Dry Mode ..........................................................................................................................................11

10-4. Economy Operation ..........................................................................................................................11

11. TROUBLESHOOTING CHART ...................................................................................... 1 2

11-1. What to be Prechecked First............................................................................................................ 12

11-2. How to Judge Faulty Parts by Symptoms ........................................................................................ 13

11-3. PC Board Layout .............................................................................................................................. 22

12. INSTALLATION INSTRUCTION..................................................................................... 24

12-1. Installation Method ........................................................................................................................... 24

12-2. Routine Maintenance ....................................................................................................................... 24

12-3. Water Supply.................................................................................................................................... 24

12-4. Changing of Water ........................................................................................................................... 25

12-5. Relocation of Air Conditioner ............................................................................................................ 25

13. CLEANING METHOD OF CONDENSER....................................................................... 26

13-1. Condenser Servicing Procedures..................................................................................................... 26

14. EXPLODED VIEWS AND PARTS LIST .......................................................................... 27

Note:

A special tool is required to remove the back cabinet.
(In EXPLODED VIEWS AND PARTS LIST, Location No. 256 “Screw Driver”)

– 3 –

Height
Width
Depth

Frequency
Rated voltage
Cooling capacity
Airflow, high
Moisture removal
Running current
Power consumption
Power factor
Model, output

Model

mm
mm
mm
kg
Hz
V
kW
m3/h
lit/h
A
W

1. SPECIFICATIONS

Item

Dimensions

Net weight
Power source

Standard
performance

Electrical
characteristics

Compressor

Condenser
Evaporator

Safety devices
Fan motor
Refrigerant
Air filter

Power cord

Accessories

720
500
315

35
50

1 phase, 220/230/240

2.10/2.18/2.18
390/400/410

1.2

3.82/3.80/3.85
780/800/840

93/92/91

PH94X1-4G1, 750W

Ripple tube type, Forced air ventilation

Finned tube type, Aircooled ventilation
Finned tube type, Aircooled ventilation

Float switch, Over current relay

20W, Induction motor

R-22, (Charged quantity, 0.47 kg)

Polypropylene net filter

3-core (One core for grounding),

1.9 m (6.4 ft) length with plug

Exhaust hose, Caster seat, Exhaust hole,

Cap for exhaust hole

RAC-08EW-E

(for indoor and exhaust)

Specifications are subject to change without notice.

2. SPECIFICATIONS OF ACCESSORIES

Item

Exhaust hose
Caster seat
Exhaust hole
Cap for exhaust hole

Remarks

Q'ty

1
4
3
3

1.4m

C

aster seat Exhaust hole Cap for exhaust hole

– 4 –

3. APPEARANCE

Fig. 3-1

4. SPECIFICATIONS OF ELECTRICAL PARTS

315mm

(12.4 in)

500mm (19.7 in)

Wind direction
control grille
(horizontal)

Air outlet

Wind direction
control grille
(Vertical)

Caster

420mm (16.5 in)

Front door

Water tank

720mm (28.3 in)

Front panel

Control panel

Operation switch
(ON/OFF)

Economy switch

230mm

(9.1in)

Sub cabinet

Back cabinet

Handle

Holder of
power cord

Power cord
(220/240V)

1.9m (6.4ft)

39mm
(1.5 in)

120mm
(4.7 in)

(1.8 in)

45.5mm

285mm

(11.2 in)

Drain hose

Case of hose

Connector of
exhaust hose

Air inlet

Air filter

Specifications

Single phase, 50 Hz, 220/230/240V ~, AC. 750W output
Winding resistance

(Ω) (at 20°C)
Single phase, 50 Hz, 230V, AC. 20W output
Winding resistance

(Ω) (at 20°C)
400V, 20µF (for compressor)
500V, 1µF (for fan motor)
250V, 3A (for fan motor)
250V, 15A (for compressor)
Rated current, 0.1A 100V DC
Primary 220V ~ 240V, Secondary 12.3V ~ 13.6V

Differential ±2°C, Adjustable range 17 ~ 28°C

Differential ±2°C
Copper wire minimum 1.0 mm

2

6.3A

Parts name

Compressor

Fan motor

Running capacitors

Relay

Float switch
Transfor mer
Microcomputer
Room temperature sensor

(Ta-sensor)
Heat-exchanger sensor

(Tc-sensor)
Power supply cord with plug
Fuse

Red-White

13.1

Type

PH94X1-4G1

STF-230-20-4C

EARU40M206UF

EEP2H105HWNB05

AJE6412

PC12D2

FS-085-002F

FT67-2

TMP47C440AN

(Microcomputer)

(Microcomputer)

TSCR

Red-Black

4.55

White-Black

8.55

Black-Orange

102.5

Orange-Blue

111.1

Black-Orange

145.9

Red-Black

205.0

– 5 –

5. WIRING DIAGRAM (RAC-08EW-E)

Fig. 5-1

1
2
3
4
5
6
7
8

9
10
11
12
13
14

1
2
3
4
5
6
7
8

9
10
11
12
13
14

OPERATION

PANEL

PC BOARD

CN06

112

2

12
12

12
12

HEAT

EXCHANGER

SENSOR

THERMO SENSOR

(ROOM TEMPERATURE)

FLOAT

SWITCH

CN05CN04CN02

12123

3

CN01

CONTROL

PC BOARD

WHI RED

BLU BLU

TRANSFORMER

VARISTOR

F01

FUSE

6.3A

C35

1

234

5

6

1

234

5

6

CN03

COMPRESSOR

RUNNING

CAPACITOR

RED

BLK

WHI

RED

BLK

CR01

RY07
RELAY

423

1

FAN MOTOR

WHIBLK

ORN

BLU

GRY

RED

CR03

RY01

RY02

RY03

RUNNING
CAPACITOR

SINGLE

50Hz

220/230/240V~

BLU

BRW

GRN&YEL

GRY
BRW
WHI
BLK
RED
BLU
GRN &YEL

ORN

:
:
:
:
:
:
:

:

GRAY
BROWN
WHITE
BLACK
RED
BLUE
GREEN &
YELLOW
ORANGE

Color Identification

R26
VARISTOR

SURGE
ABSORBER
DSA

CR02

CN08 CN07

– 6 –

6. COOLING CHARACTER CHART

Fig. 6-1

Humidity

2.7

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 C

Ambient temperature

Cooling Capacity kW

40%

50%

60%

70%

2.6

2.5

2.4

2.3

2.2

2.1

2.0

1.9

1.8

1.7

– 7 –

Conditions

Surface temp. of heat exchanger

interchanging pipe (°C)

T

1

10
17

5

Outdoor

35/24
43/26
21/15

Ambient temp.

conditions DB/WB (°C)

Indoor

27/19
32/23
21/15

T

2

50
57
34

Cooling

Standard
High temperature
Low temperature

7. REFRIGERATING CYCLE DIAGRAM

RAC-08EW-E

Fig. 7-1

RAC-08EW-E

Table 7-1

Note:

Measure the heat exchanger temperature at the center of U-bend. (By means of thermistor thermometer.)

Capillary tube
I.D : 1.2 mm
O.D : 2.04 mm
Length : 400 mm

Evaporator

T1

Suction tube
I.D : 6.8 mm
O.D : 8.0 mm

Comp­ressor

Sub condenser (air)

Delivery tube

I.D : 4.8 mm

O.D : 6.0 mm

Main condenser (Water)

T2

– 8 –

8. MICROCOMPUTER BLOCK DIAGRAM

Fig. 8-1

Functions

3-minute delay at Restart for
compressor

Start-up Compensation for fan
motor

Timer
Processing

(Temperature processing)

Clock frequency oscillator circuit

Initializing circuit

C.P.U.

Mode selector

(Cool/Dry/Fan only)

Operation indicator

Economy indicator

Economy indicator

Warning indicator

Timer selector (ON,

CONTINUE, OFF)

Timer setting

Air flow selection

(Fan selector High,

Low, AUTO)

Operation

(ON/OFF)

Temperature setting

Economy selection

(ON/OFF)

Room temperature sensor

(Ta sensor)

Power supply

circuit

Relay driver

Miniature

relay

Relay driver

Transformer

Power relay

Heat-exchanger sensor

(Tc sensor)

AC input

DC 12 volt

DC 5 volt

Compressor ON/OFF signal

Fan motor signal

Compressor

Fan motor

Control unit

Remote control unit

AC 50Hz
220/230/

240V

A bold line denotes a 220/230/240V AC line.

– 9 –

9. OPERATION DESCRIPTIONS

9-1. Operation Control Knobs on Control Panel

Fig. 9-1

FAN ONLY DRY:COOL

MODE FAN SPEED

TIMER SELECT

HIGH LOW:AUTO

OFF CONT. ON

WARNING TIMER ECONOMY OPERATION

TIMER

THERMO

ECONOMY I/O

2 4 6 8 10 12 Hr.

18 20 22 24 26 28 C

RAC-08EW-E

This lamp will light up during the
COOL, DRY, or FAN ONLY
operation. It begins flashing if a
power failure occurs.

This lamp will light up when you
push the ECONOMY button.

This lamp will light up when the
TIMER SELECT knob is set to ON or
OFF.

This lamp will light up when the
water in the tank runs out. When
the tank is refilled, the lamp will go
off.
The red lamp flashes during abnormal
operation. To turn off the lamp, push
the ON/OFF button.
Waiting about five minutes, push the
button again, the OPERATION lamp
will light up and the air conditioner
will start operating.

Lamps

OPERATION
(green)

ECONOMY
(green)

TIMER
(yellow)

WARNING
(red)

I/O button

Push this button to start the air
conditioner, push it again to stop it.

ECONOMY button

Push this button to start the
economy operation, push it again to
cancel the economy operation.

Upon expiry of the number of hours
set using the TIMER knob, the
air conditioner starts operating if the
knob is set at ON or stops operating
if the knob is at OFF.
With the knob set at CONT., the air
conditioner continues operating
regardless of the TIMER setting.

TIMER SELECT knob

The AUTO position automatically
changes the fan speed according to
room temperature.
During DRY and ECONOMY mode,
LOW is used regardless of the setting.

FAN SPEED knob

MODE knob

Use to select the operation mode
COOL, DRY, or FAN ONLY.

THERMO knob

The scale gives just a rough mesure
of the temperature setting.

Set to a desired time.

TIMER knob

– 10 –

10. OUTLINE OF OPERATIONS

10-1.Basic Operation

(1) When I/O button is pushed, the relays RY01,

RY02 or RY03 and power relay RY07 start ac­cording to the conditions set by F AN SPEED knob
selector switch. Thus, the indoor fan motor and
compressor are controlled. (Operations as de­scribed in this paragraph are all programmed. And
following items are same as it.)

(2) When the I/O button is pushed again, the relays

are all disabled, and the air conditioner stops.

(3) When the I/O button is pushed with the timer set

at any desired time, the relays are all disabled
and the air conditioner stops when the timer
reaches the set time. However, if the operation
is started with the timer set to “CONTINUE”, the
operation continues.

(4) To adjust the room temperature, set the knob

mounted on the control panel at desired tempera­ture. The room temperature sensor detects and
controls the adequate temperature.

(5) When the FAN SPEED selector switch is set to

“AUTO”, the volume of air is controlled to be felt
agreeable.

10-2. Economy Mode

This control mode establishes some zones corre­sponding to different combinations of on and off in­tervals of the compressor and selects a suitable zone
depending on the lapse of time from the start of op­eration and the temperature.

Fig. 10-1

Table 10-1 During cooling

Table 10-2 During drying

+4 C
+3 C
+2 C
+1 C

Setting temp.

-1 C

Zone B

Zone D

Zone F

Zone A

Zone C

Zone E

1H 2H 3H

Monitoring
(when room temperature
is not higher than the
set temperature)

Time

Room
temperature

Lapse from

start

0 to 1 hour

1 to 2 hours

2 hours ~

Zone

A
B
C
D
E
F

Compressor

ON OFF 18 – 4 minutes
ON OFF 3 – 4 minutes
ON OFF 5 – 7 minutes
ON OFF 3 – 7 minutes
ON OFF 5 – 10 minutes
ON OFF 3 – 10 minutes

Lapse from

start

0 to 1 hour

1 to 2 hours

2 hours ~

Zone

A
B
C
D
E
F

Compressor

ON OFF 5 – 4 minutes
ON OFF 3 – 4 minutes
ON OFF 5 – 7 minutes
ON OFF 3 – 7 minutes
ON OFF 5 – 10 minutes
ON OFF 3 – 10 minutes