Toshiba RAS-10SKH-X, RAS-10SKH-E, RAS-10SAH-E SERVICE MANUAL

T O S H I B AF I L E N O . A

S E R V I C E M A N

A I R - C O

S P L I T

RA S - 1R0ASSK-H1

RA S -1R0ASSK-H1

P R I N T E D I N J A P

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

– 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 ...................................................................................................		44
9-3-5. Only Outdoor Fan does not Operate ...................................................................................................		45
9-3-6. Only 4-Way Valve does not Operate ....................................................................................................		46
9-3-7. Only the Indoor Fan does not Operate ................................................................................................		47
9-4. How to Check the Remote Control (Including the Indoor PC Board) ................................		48
9-4-1. How to Check the PC Board .................................................................................................................		49
9-4-2.	PC Board Layout ...................................................................................................................................	51
9-4-3.	How to Reduce the 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

Model

RAS-10SKH-E/10SAH-E, RAS-10SKHX/10SAHX

Item

COOLING

HEATING

Capacity

*1

kW

220V

230V

240V

220V

230V

240V

2.65

2.68

2.70

3.00

3.05

3.10

Phase

Single

Power source

V

220/230/240

Hz

50

Power consumption

kW

0.98/0.99/1.02

0.89/0.90/0.91

Power factor

%

95/92/90

95/92/88

Running current

A

220V

230V

240V

220V

230V

240V

Indoor/Outdoor

0.11/4.58

0.11/4.57

0.11/4.61

0.11/4.17

0.11/4.16

0.11/4.22

Starting current

A

19

Moisture removal

lit/h

1.2

Noise

Indoor (H/M/L)

dB

41/36/31

Outdoor (220/230/240V)

dB

47/48/49

Refrigerant

Name of refrigerant

R-22

Rated volume

kg

0.74

Refrigerant control

Capillary tube

Gas side size

mm

9.52

Connection type

Flare connection

Liquid side size

mm

6.35

Interconnection pipe

Connection type

Flare connection

Maximum length (of one way)

m

*2

10

Maximum height difference

Indoor unit

5

−

m

Outdoor unit

↓

Condensate drain pipe

Outer diameter

mm

16

INDOOR UNIT

RAS-10SKH-E/RAS-10SKHX

Height

mm

265

Dimensions

Width

mm

790

Depth

mm

174

Net weight

kg

8

Evaporator type

Finned tube

Indoor fan type

Cross flow fan

High fan

m3/h

600

Air volume

Medium fan

m3/h

500

Low fan

m3/h

400

Fan motor output

W

19

Air filter

Polypropylene net filter (Washable)

OUTDOOR UNIT

RAS-10SAH-E/RAS-10SAHX

Height

mm

530

Dimensions

Width

mm

770

Depth

mm

200

Net weight

kg

31

Condenser type

Finned tube

Outdoor fan type

Propeller

Airflow volume

m3/h

1600

Fan motor output

W

18

Compressor

Model

PH120T1-4C

Output

W

750

Safety device

Fuse, Overload relay

Auto louver

Yes

Usable outdoor temperature range

°C

21 ~ 43

– 5 ~ 21

Specifications are subject to change without notice.

– 4 –

Note : *1

• Capacity is based on the following temperature conditions.

Condition		JIS C9612-1994
Temperature	Cooling	Heating
(DB)	27°C	20°C
Indoor unit inlet air temperature
(WB)	19°C	12°C
(DB)	35°C	7°C
Outdoor unit inlet air temperature
(WB)	24°C	6°C

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.

– 5 –

2. CONSTRUCTION VIEWS

2-1. Indoor Unit

RAS-10SKH-E

RAS-10SKHX

Air inlet	Air filter	Heat exchanger
	790	174

265	АААААА€@@@@@@,,,,,,€€€€€
	АААААА€@@@@@@,,,,,,€€€€€			50
	1800	10SKH-E : Without power cord	47	10
Air outlet		10SKHX : With power cord

Knock out system

	790
232	326	232	Front panel
	Hanger		Back body

		47
		50
Drain hose (0.54m)	321	10
Hanger		Knock out system
Connecting pipe (0.39m)		Connecting pipe (0.49m)
	(Flare ø9.52)	(Flare ø6.35)

		65.5		659	65.5	Hanger	Wireless
				450
						For stud bolt	remote
	Hanger			326			control
						(ø8~ø10)
				66 or more
				Minimum		For stud bolt
46	20	2.5		distance	20	(ø6)
				to ceiling
							55
		Minimum			20	Minimum	Remote
265	17	distance				distance to wall	control
		to wall					holder
		120 or more			120 or more
40.5	3.5				37	40.5
			Hanger	Hanger
			Center line	Installation			59.6
				plate outline
					60.5
		76	319	269	126
				790
				– 6 –

136

16

112.8 5

2-2. Outdoor Unit
RAS-10SAH-E
RAS-10SAHX
	A Detail Drawing			A	36
			600
		36	R10
		50
			230	216	30
230	216	25			50
ø11x14 Hole			ø6 Hole
	Handle
			11		Fan guard
				ø420

525

530

268

5

600

85

111

ø25 Drain hole		Gas side (flare ø9.52)

		Liquid side (flare ø6.35)
	8-ø6 Holes	200
	(For fixing the outdoor unit)	12
	4-ø11x14 Long holes
		11
	111 (For anchor bolt ø8-ø10)
	TOSHIBA	Electric
		parts cover

Z

	54	62
		Access for
	89	charging
770	59	250

89

230

268

59	770
	Z View
or more	600
	Inlet port
45		600 or more
Inlet port
100 or more	Visible outline	(Minimum distance
	of the product	of the wall)

	more	Outlet	4-ø11x14 Long holes
			(For anchor bolt ø8-ø10)
		port
	or		Center
	200
			port

Mounting dimension of anchor bolt

– 7 –

3. WIRING DIAGRAM

Model	Section A
RAS-10SKH-E/SAH-E	L
220/230/240V ~	N
50Hz		THERMAL FUSE
RAS-10SKHX/SAHX	L	77˚C × 2
220/230/240V ~	N	GRY
50Hz

1

1

BLK SG01 R109

GRN&YEL P04 DSA VARISTOR

F01 FUSE

	LOUVER
	MOTOR						DC		FAN MOTOR
						MOTOR
GRY		BLU PNK YEL ORN RED BRW				WHI BLU YEL BLK RED
3	CN04	6 5 4 3			2 1	5 4 3		2 1
3		CN07 6	5 4	3	2 1	5 4	3	2 1	CN10
	R116						MAIN P.C. BOARD
								MCC-713
	IC04

	L	BRW	T3.15A	R01	DB01	T01
Section A	N		250V	C01	C02	DC35V
		BLU

POWER

3

3 R21

C15

L01

DC12V

TERMINAL

RY02

RY01

BLOCK

4

4

DC7V

T02

BLK

C.T.

WHI

DC0V

C06

IC02

IC

IC01

RY03

RY04

1

2

3 4

5

6

7

8

9

CN13

1

2

CN03

1

2

CN01

BLU BLU BLU BLU BLU BLU PNK BLK WHI

1

2

1

2

CR01

BLK BLK

BLK BLK

1

1

1

2

3 4

5

6

7

8

9

1

2

3 4

5

6

7

8

9 CN25

2

CR02

INFRARED RAYS RECEIVE

3

4 4

AND INDICATION PARTS

THERMO

HEAT

CN27

SENSOR

EXCHANGER

(TA)

SENSOR

RED BLU GRN&YEL

(TC)

INDOOR

BLK WHI

DSA : Surge absorber

TERMINAL

C.T : Current trans

BLOCK 1

2 3 4

INDOOR

OUTDOOR

OVER LOAD

1

2 3 4

COLOR IDENTIFICATION

RELAY

GRN & YEL

BRW : BROWN

BLK

BLK

CHASSIS

RED : RED

BLK

WHI : WHITE

RED

SOLENOID

RUNNING

YEL : YELLOW

BLU : BLUE

CAPACITOR

COIL

BLK

BLK : BLACK

RED

GRY : GRAY

COMPRESSOR

RUNNING

RED

PNK : PINK

CAPACITOR

ORN : ORANGE

PNK

WHI

GRN&YEL : GREEN &

WHI

BLK

YELLOW

FAN MOTOR

– 8 –

4. SPECIFICATIONS OF ELECTRICAL PARTS

4-1. Indoor Unit

RAS-10SKH-E

RAS-10SKHX

	No.	Parts name	Type	Specifications
			ICF-35-19-3
	1	Fan motor (for indoor)	or	Output (Rated) 19W, 2pole, 1phase, 220/230/240V, 50Hz
			TICF-35-19-3
	2	Thermo sensor	(microprocessor)	10kΩ at 25°C
		(TA-sensor)
	3	DC-DC transformer (T01)	SWT-34	DC390V, Secondary DC35V, 12V, 7V
	4	Microcomputer	TMP87CK40F
	5	Power relay (RY01), Com-	DI1U	Coil : DC12V 75mA, Rated AC250V 20A
		mon relay (RY02)
	6	Heat exchanger sensor	(microprocessor)	10kΩ at 25°C
		(TC-sensor)
	7	Line filter (L01)	RF-103YOR6	10mH, AC 0.6A
	8	Diode (DB01)	RBV-406	4A, 600V
	9	Capacitor (C02)	CEAUF2W101M20	100μF, 450V
	10	Fuse (F01)	MT3	T3.15A, 250V
	11	Relay (for outdoor fan motor,	AJQ1341	Coil DC12V, 33mA, Rated 1A 250V AC
		solenoid coil) (RY03, RY04)
	12	Power supply IC (IC01)	MA2830-FJ	4A, 600V
	13	Varistor (R21, 109)	15G561K	560V
	14	Resistor (R01)	ERF-5TK5R6	5.6 Ω, 5W
	15	Current trans (T02)	CT422920S-01

4-2. Outdoor Unit

RAS-10SAH-E

RAS-10SAHX

No.	Parts name	Type	Specifications
			Output (Rated) 750W, 2pole, 1phase, 220/230/240V, 50Hz
1	Compressor	PH120T1-4C	Ω	)	Red-Black	White-Black
			Winding resistance (
			(at 20°C)		4.53	8.73
			Output (Rated) 18W, 6pole, 1phase, 220/230/240V, 50Hz
2	Fan motor (for outdoor)	UE6-21SJ5P	Ω	)	Red-Black	White-Black
			Winding resistance (
			(at 20°C)		370	370
3	Running capacitor	SK-50CMP	500V AC, 1.5μF
	(for fan motor)
4	Running capacitor	SK-40CMP25U1	400V AC, 25μF
	(for compressor)
5	Solenoid coil	LB60012	AC : 200/240V
	(for 4-way valve)
6	Overload relay	J-MRA99269-9200	U/T 6.8A (90°C), OPEN 135±5°C, CLOSE 69±11°C

– 9 –

	5. REFRIGERANT CYCLE DIAGRAM
RAS-10SKH-E / RAS-10SAH-E
RAS-10SKHX / RAS-10SAHX		T1
		Indoor unit
	Cooling	Evaporator
0.39m	Heating		0.49m
			(Connecting pipe)
(Connecting pipe)
ø9.52		Cross flow fan	ø6.35

						Optional piping kits
O.D.:9.52mm				P		RB-P31BEF1 (3m)				O.D.:6.35mm
						RB-P51BEF1 (5m)
						RB-P71BEF1 (7m)
			Packed valve				Packed valve
				(ø9.52)			(ø6.35)

Cooling	Heating
	4-way valve
Heating	Cooling Compressor	PH120T1-4C
	Accumulator			Capillary tube
				ø1.7x1400
		Dryer
		Condenser
				Refrigerant
		Propeller fan		R-22 0.74kg
	Cooling	Outdoor unit	Mark(	)means check points of Gas Leak
	Heating
		Fig. 5-1

Table 5-1

			Standard pressure			Surface temp. of heat				Ambient temp.
				P		exchanger interchanging
									Fan speed	conditions DB/WB
		50Hz	(kg/cm²G)			pipe	T1	(°C)
										(°C)
									(indoor)
			10SKH-E			10SKH-E
			10SKHX			10SKHX
										Indoor	Outdoor
		Standard	15.0			40.0			High	20/–	7/6
Heating		High temperature*1	19 ~ 23			52.0 ~ 59.0			Low	27/–	21/15
		Low temperature	12.5			35.0			High	20/–	–10/–10
		Standard	6.0			12.0			High	27/19	35/24
Cooling		High temperature	6.5			15.0			High	32/23	43/26
		Low temperature	4.0			2.0			Low	21/15	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.

– 10 –

– 11 –

Heat Exchanger Sensor

Thermo Sensor

Current Sensor

(Compressor Current)

Infrared Rays Signal Receiver

Infrared

Rays

Remote Control

Operation (START/STOP)

Operation Mode Selection

AUTO, COOL, DRY, HEAT, FAN ONLY

Thermo Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

ECONO.

AC220/230/240V ~ 50Hz

Main Unit Control Panel	C. P. U
Functions				Operation
				Display
• Louver Control
				Timer
				Display

• 3-minute Delay at Restart for Compressor

ECONO.

Sign Display

Initializing Circuit

• Motor Revolution Control

PRE-DEF.

Sign Display

Clock Frequency

• Processing

Oscillator Circuit

(Temperature Processing)

Indoor

• Timer

Fan Motor

Power Supply

Compressor

Outdoor Fan

4-Way Valve

Louver

Circuit

ON/OFF Signal

ON/OFF Signal

ON/OFF Signal

ON/OFF Signal

Noise Filter Relay Driver, Louver Driver

Louver

Motor

Relay	Relay	Relay
RY01	RY03	RY04

Relay

RY02

Compressor		Outdoor Fan Motor		4-Way Valve

DIAGRAM BLOCK COMPUTER-MICRO .6

7. OPERATION DESCRIPTIONS

7-1. FAN ONLY Operation

(MODE of the remote control : FAN ONLY)

(1)During this mode, the relay RY01 is always turned off so that only the indoor fan is operated. RY02 is always turnd on.

1)When the FAN is set to AUTO, the indoor fan motor operates as shown in Fig 7-1-1.

2)When the FAN is set to LOW, MED, or HIGH, the indoor fan motor operates with a constant in volume as listed in Table 7-1-1.

	Set temp.)		28
	–			HIGH
	temp.		27
				MED
	(Room		26	LOW(+)
			25
	Set		24	LOW
	temp.			LOW

Fig. 7-1-1 Auto setting of air volume

Table 7-1-1 Manual setting of FAN SPEED

Indication of	HIGH Air volume
FAN SPEED	(m3/n)
LOW	400
MED	500
HIGH	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.

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.

temp.)			ON			ON
Set–		+1
temp.			OFF	ON	OFF	OFF	ON
(Room
Set		0
temp.			Compressor (RY01)	relayCommon (RY02)	valveway-4 (RY04)	fanOutdoor (RY03)	OPERATION display

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.

				FAN
temp.)
				AUTO	Manual
Set–		+4		HIGH
				MED
temp.		+3		LOW(+)	to the set
					According
(Room		+2			position
				LOW
		+1
Set		0		LOW
				(continuous)
temp.
			RY01
			OFF

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.

– 12 –

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 vertically 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.

	temp.)		+3	ON:6min.	OFF:4min.			ON:6min.	OFF:4min.
	temp.– Set			ON:5min.	OFF:5min.			ON:5min.	OFF:5min.
			+2			ON	OFF			ON
	(Room
			+1	OFF				OFF
	Set		0
	temp.			Compressor	(RY01)	relayCommon (RY02)	valveway-4 (RY04)	fanOutdoor	(RY03)	OPERATION display

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:

Room temp.

Set temp.+1

Set temp.

Compressor	ON		ON		ON		ON
Outdoor fan		OFF		OFF		OFF
Indoor fan
	L.	*S.L.	L.	S.L.	L.	S.L.	L.
	*Super Low

Fig. 7-3-2

– 13 –

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.

temp.)Set–	0
temp.			OFF	ON	OFF
(Room			ON			ON
	–1
			ON		ON
			Compressor (RY01) Common relay (RY02)	4-way valve (RY04)	Outdoor fan (RY03)	OPERATION display

Fig. 7-4-1

(2)Relays RY01 and RY02 are turned on to energize the outdoor unit, and a heat operation is carried out. The indoor fan motor operates as shown in Fig. 7-4-2, when the FAN is set to AUTO.

The motor operates with a constant air volume as listed in Table 7-1-1, when the FAN is set to LOW, MED, or HIGH.

			RY01 OFF	FAN
	Set		0	AUTO	Manual
	temp.
	temp.)		-1
			-2	LOW	According
				LOW(+)
	Set		-3		to the set
				MED(-)	position
	–		-4
	temp.(Room
				MED

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.

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 vertically swings within range of 25deg.

And the louver position is stored in the microcomputer, 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.

– 14 –

7-5. AUTO Operation

(MODE of the remote control : AUTO)

(1)One of the 3 modes, Cooling, Fan only and Heating 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.

(Room temp. – Set temp.)

		Cooling mode	(The same cooling mode as the room temperature control is set at set temp. –1˚C)
			The Louver moved downward.
	+4
		Cooling mode	(The same cooling mode as the room temperature control is set at set temp. –1˚C)
	+1
		Fan only mode	(Only the indoor fan operates at Low speed)
	–1
		Heating mode	(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

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.	0H	1H	2H	TIME

ECONO. button is pushed

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

0H	1H	2H	TIME
Set temp.
-1
	Set temp.
	is changed
-2
		Set temp.
		is changed
(˚C)
	Fig. 7-6-2

7-7. Current Limit Control

The microprocessor detects the input current so as to prevent it exceeds a specified value by means of controlling the outdoor fan control as described in (1) and (2).

(1)Current limit control (Cooling)

Control is performed as shown below by detecting the compressor operation current with a current sensor (C.T).

				Compressor		Outdoor fan
Input				More than I4 continues for 3 seconds
current					OFF
10A	I4
				More than I3 continues for 5 minutes
9A	I3				OFF
					ON

Fig. 7-7-1

(2)Current limit control (Heating)

Control is performed as shown in Fig. 7-7-2.

		Compressor		Outdoor fan
Input		More than I4 continues for 3 seconds
current			OFF
10A	I4	More than I3 continues for 5 minutes
9A	I3		OFF
8A	I2	ON		OFF
7.5A	I1
			ON

Fig. 7-7-2

– 16 –

7-8. High-Temperature Limit 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

Compressor, (˚C) Outdoor fan

60 *1

53

OFF

52

ON

*1 ····· Only outdoor fan is turned off.

Fig. 7-8-1

7-9. Low-Temperature Limit Control

(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.

Heat exchanger
temperature	Compressor Outdoor fan

	(˚C)	ON
	7
		Less than 5˚C continues
	5	for 5 minutes
		OFF

Fig. 7-9-1

7-10. Cool Airflow Prevention Control

(Heating 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. Room temp.

<	>
Set temp.	Set temp.
OFF	S.L (Super Low)

Fig. 7-10-1

(2) As soon as the defrost operation starts, the indoor fan stops.

– 17 –

7-11. Defrost Operation

During the heating operation, the outdoor heat exchanger temperature goes down and sometimes it is frozen.

In this case, the air conditioner stops the heating operation and starts the defrost operation to melt ice.

7-11-1. Condition to Start the Defrost Operation

The defrost operation starts whichever below conditions are specified.

(1)When the cumulative compressor operation time is longer than 40 or 90 minutes and difference between the indoor heat exchanger temperature and the room temperature is less than the specified value. (This value is decided by the microprocessor.) (Control example 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.

temp.	(˚C)

exchangerheatIndoor temp.–Room			D
	19
	10	A	B	Cumulative
			C	compressor
				operation time
		40	90	(min.)

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.)

minutes		minutes		minutes		minutes
40		40		40		40
Heating	Defrost	Heating	Defrost	Heating	Defrost	Heating	Defrost
		Max 6 minutes			10 minutes
			1 cycle
			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.

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) 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.

– 18 –

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 continuously for three seconds. The unit will acknowledge the setting and beep three times. The system will now restart automatically.

The above Auto Restart settings can be carried out:

OPERATION			MOTION
Press the TEMPORARY button		Stand-by
continuously more than three		↓
seconds.		The system starts to operate.	The green light will be lit.
		↓	about three seconds after
0		The unit beeps three times.	The orange light will be lit.
	3S	↓
TEMPORARY		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.
• When the system is operating
OPERATION			MOTION
Press the TEMPORARY button		Operating	The green light is lit.
continuously more than three		↓
seconds.		The system stops to operate.	The green light is turned off.
		↓	about three seconds after
0		The unit beeps three times.
	3S	↓
		The system stops.
TEMPORARY
		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 (AUTO) operation, after restart by the Auto Restart function the louver swing stops.

– 19 –