Toshiba RAS-M16GKV-E2, RAS-M13GKV-E2, RAS-M13GKCV-E2, RAS-M10GKV-E2, RAS-M10GKCV-E2 SERVICE MANUAL

FILE NO.SVM-06036

SUPPLEMENT

SERVICE MANUAL

AIR-CONDITIONER

SPLIT TYPE

RAS-M10GKV-E2, RAS-M13GKV-E2, RAS-M16GKV-E2

RAS-M10GKCV-E2, RAS-M13GKCV-E2, RAS-M16GKCV-E2

(This service manual provide information only on the indoor units. For information on the outdoor unit please refer to the service manual of the outdoor unit.)

R410A

June, 2006

FILE NO. SVM-06036

CONTENTS

1.Specifications

2.Construction Views

3.Wiring Diagram

4.Specifications of Electrical Parts (Indoor unit only)

5.Control Block Diagram (Indoor unit only)

6.Operation Description

7.Installation Procedure

8.How to Diagnose the trouble

9.How to Replace the main parts (Indoor unit only) 10. Exploded Views and Parts list (Indoor unit only)

– 1 –

FILE NO. SVM-06036

1. SPECIFICATIONS

Specifications

RAS-M10GKV-E2, RAS-M13GKV-E2, RAS-M16GKV-E2

Power supply			220/230/240V, 1Ph, 50/60Hz
Electric	Unit model		RAS-M10GKV-E2	RAS-M13GKV-E2		RAS-M16GKV-E2
characteristice	Running current	(A)	0.15	0.15		0.15
	Power consumption	(W)	30	30		30
	Power factor	(%)	87	87		87
Operating	High	dB (A)	36/39	39/40		42/42
noise	Medium	dB (A)	33/35	35/35		39/39
	Low	dB (A)	28/29	28/29		33/33
Dimension	Height	(mm)	275	275		275
	Width	(mm)	790	790		790
	Depth	(mm)	218	218		218
Net weight		(kg)	10	10		10
Fan motor output		(W)	20	20		30
Air flow rate		(m3/h)	570/610	590/620		650/660
(Cooling/Heating)
Piping	Type			Flare connection
connection	Liquid side		6.35	6.35		6.35
	Gas side		9.52	9.52		12.7
Refrigerant				R410A
Wiring connection (Interconnection)				4 wires : includes earth
RAS-M10GKCV-E2, RAS-M13GKCV-E2, RAS-M16GKCV-E2
Power supply			220/230/240V, 1Ph, 50/60Hz
Electric	Unit model		RAS-M10GKCV-E2	RAS-M13GKCV-E2		RAS-M16GKCV-E2
characteristice	Running current	(A)	0.15	0.15		0.15
	Power consumption	(W)	30	30		30
	Power factor	(%)	87	87		87
Operating	High	dB (A)	36	39		42
noise	Medium	dB (A)	33	35		39
	Low	dB (A)	28	28		33
Dimension	Height	(mm)	275	275		275
	Width	(mm)	790	790		790
	Depth	(mm)	218	218		218
Net weight		(kg)	10	10		10
Fan motor output		(W)	20	20		30
Air flow rate		(m3/h)	570	590		650
Piping	Type			Flare connection
connection	Liquid side		6.35	6.35		6.35
	Gas side		9.52	9.52		12.7
Refrigerant				R410A
Wiring connection (Interconnection)				4 wires : includes earth

∙The specifications may be subject to change without notice for purpose of improvement.

–2 –

FILE NO. SVM-06036

2. CONSTRUCTION VIEWS

Indoor Unit

Front panel

Air inlet Air filter Heat exchanger

790	218

275

60	Air outlet	60
6		6
		48

Knock out system

120

Drain hose (0.54m)

Hanger

		45
		Minimum
		distance
	275	to ceiling
		170 or more

90 150

Knock out system

48

64	53
590	80
Hanger

	320		Connecting pipe (0.43m)
			(Flare	6.35)
			Connecting pipe (0.33m)
			(For 10,13 series ; Flare 9.52
			For 16 series ; Flare 12.7)
	620			For stud bolt
235		235
215		215		( 8~ 10)
Minimum	more	Hanger		For stud bolt (		6)
distance	65or			26
to ceiling
					45
				Minimum
				distance	190		160
				to ceiling
				170 or more
				32	40
Hanger			Hanger			57	18
160		160	150	90		Wireless remote control

Installation plate outline

Center line

– 3 –

FILE NO. SVM-06036

3. WIRING DIAGRAM

3-1. Indoor Unit (For 10k & 13k)

	COLOR INDICATION
	BRW : BROWN						TERMINAL		2	1
	RED : RED
	WHI : WHITE						BLOCK
	YEL : YELLOW
	BLU : BLUE
	BLK : BLACK
	GRY : GRAY
	PNK : PINK									BLK	WHI	RED
	ORN : ORANGE
	GRN&YEL : GREEN & YELLOW
	GRN : GREEN
					CN01				CN24		CN23	CN21
				BLK	(BLU)
					1	1
				BLK	2	2
HEAT EXCHANGER
	SENSOR				CN03			FUSE
	(TC)				(WHI)
				BLKBLK					F01		3
					1	1	T3.15A
THERMO SENSOR					2	2		250VAC
		(TA)
		CN25			CN13
		(WHI)		BLUBLU	(WHI)
	RECEIVINGAND INDICATINGPARTS	1	1		1	1
INFRAREDRAYS		2	2	BLU 2		2			WP-004
		10	10	BLU	10	10
		3	3		3	3
		4	4	BLU	4	4
		5	5	BLU	5	5
		6	6	BLU	6	6
		7	7	BLU	7	7
		8	8	BLU	8	8	MAIN P.C. BOARD
		9 9 BLU 9 9
		11 11		WHI 11 11
MCC-861												CN08

INDOOR OUTDOOR

UNIT UNIT

LINE
FILTER	5

				Power		CN07
			supply circuit
						(WHI)
R04
				+12 VDC		1	1
				+5 VDC		2	2
		Fan Motor				3	3
						4	4
		Drive circuit
						5	5
CN11 1	2	3	CN10	5	3	1	6
1	2	3		5	3	1

YEL GRY BRW

WHI

BLK

RED

WHI 1		1
YEL	2	2
YEL	3	3
YEL	4	4
YEL	5	5

LOUVER MOTOR

1 2 3 4 56 1 2 3 4 56

	1	4	1 2 3 4	150°C	AC FAN MOTOR
			HA
			JEM-A

Simple Check for Failure Diagnosis

	Check Item		Diagnosis Result
			Check to see if the OPERATION indicator goes on
	1	OPERATION	and off when the main switch or breaker is turned on.
		INDICATOR	(Check the primary and secondary voltage of the
			transformer.)
			Check the power supply voltage between 1 and 2 .
			(Refer to the name plate.)
	2	TERMINAL	(Check the primary and secondary voltage of the
		BLOCK	transformer.)
			Check the fluctuating voltage between 2 and 3 .
			(15~60VDC)

	FUSE
3
	3.15A

4 DC5V

5 DC12V

Check to see if the fuse blows out. (Check the R04 of the varistor.)

Check the voltage at the No.4 pin on CN13 connector of the infrared receiver.

(Check the transformer and the power supply circuit of the rated voltage.)

Check the voltage at the white lead of the louver motor.

(Check the transformer and the power supply circuit of the rated voltage.)

			Check the voltage at the No.1 pin on CN10
	6
			connector and CN24.
			(Check the F01)
	(AC 220~240V)

Refer to the service data for the detailed failure diagnosis.

– 4 –

FILE NO. SVM-06036

3-2. Indoor Unit (For 16k)

COLOR INDICATION

BRW : BROWN

RED : RED

WHI : WHITE

YEL : YELLOW

BLU : BLUE

BLK : BLACK

GRY : GRAY

PNK : PINK

ORN : ORANGE

GRN&YEL : GREEN & YELLOW

GRN : GREEN

						CN01
					BLKBLK	(BLU)
						1	1
HEAT EXCHANGER						2	2
		SENSOR				CN03
		(TC)			BLKBLK	(WHI)
						1	1
THERMO SENSOR						2	2
			(TA)			CN13
			CN25
			(WHI)		BLUBLU	(WHI)
			1	1		1	1
INFRARED RAYS	RECEIVING AND	INDICATING PARTS	2	2	BLUBLU	2	2
			3	3		3	3
			4	4	BLU	4	4
			5	5	BLU	5	5
			6	6	BLU	6	6
			7	7	BLU	7	7
			8	8	BLU	8	8
			9	9	BLU	9	9
			10 10			10 10
			11 11		WHI	11 11
MCC-861

1

4

TERMINAL

2

1 2 3

INDOOR

OUTDOOR

BLOCK

UNIT

UNIT

BLK

WHI

RED

CN24

CN23

CN21

6

CN10

FAN MOTOR

(WHI)

1 1 RED

FUSE

3

3

WHIBLK

DC MOTOR

F01

4

4

BLUYEL

T3.15A

3

5

5

250VAC

6

6

LINE

DC5V

DC12V

5

FILTER

R05

DB01

POWERSUPPLY

CIRCUIT

4

4 4

MAIN P.C. BOARD

~

4

YEL

CN07

-

+

+

(WHI)

1

1

R04

~

1

1

WHI

2

2

YEL

2

2

C03

3

3

YEL

3

3

MCC-867or MCC-5014

5 5 YEL 5 5

CN08		LOUVER MOTOR

1 2 3 4

HA

JEM-A

Simple Check for Failure Diagnosis

Check Item

1 OPERATION INDICATOR

2 TERMINAL BLOCK

3	FUSE
	3.15A

4 DC5V

5 DC12V

Diagnosis Result

Check to see if the OPERATION indicator goes on and off when the main switch or breaker is turned on. (Check the primary and secondary voltage of the

transformer.)

Check the power supply voltage between 1 and 2 .

(Refer to the name plate.)

(Check the primary and secondary voltage of the transformer.)

Check the fluctuating voltage between 2 and 3 . (15 ~60VDC)

Check to see if the fuse blows out. (Check the R04 of the varistor.)

Check the voltage at the No.4 pin on CN13 connector of the infrared receiver.

(Check the transformer and the power supply circuit of the rated voltage.)

Check the voltage at the white lead of the louver motor.

(Check the transformer and the power supply circuit of the rated voltage.)

			Check the voltage at the No.1 pin on CN10
	6
		DC325V	connector.
			(Check the DB01, R05 and C03.)
	(DC310~340V)

Refer to the service data for the detailed failure diagnosis.

– 5 –

FILE NO. SVM-06036

4. SPECIFICATIONS OF ELECTRICAL PARTS

RAS-M10GKV-E2, RAS-M13GKV-E2

RAS-M10GKCV-E2, RAS-M13GKCV-E2

No.	Parts name	Type	Specifications
1	Fan motor (for indoor)	SKF-220-20-4A-1	AC Motor with 150°C thermo fuse
2	Thermo. sensor (TA-sensor)	———	10 kΩ at 25°C
3	AC-AC transformer (T01)	TT-10	187 − 276V, 6VA
4	Microcomputer	μPD780024AGK
5	Heat exchanger sensor	———	10 kΩ at 25° C
	(TC-sensor)
6	Line filter (L01)	SS11V-06270	27 μH , AC 0.64A
7	Diode (DB01)	KBP06M	1.5A, 420V
8	Capacitor (C50)	LXV35VB2200MJ20	2200 μF, 35V
9	Fuse (F01)	BET 3.15A 250VAC	T3.15A, 250 V
10	Regulator IC (IC08)	NJM7812	12VDC, 1.5A max
11	Regulator IC (IC11)	NJM7805	5VDC, 1.5A max
12	Varistor (R21, R109)	TND15G561K	560 V
13	Louver motor	24BYJ48	DC 12V

RAS-M16GKV-E2, RAS-M16GKCV-E2

No.	Parts name	Type	Specifications
1	Fan motor (for indoor)	ICF-340-30-2	DC 340 V, 30 W
2	Thermo. sensor (TA-sensor)	———	10 kΩ at 25° C
3	DC-DC transformer (T01)	SWT-70	DC 390 V, Secondary DC 15 V, 12 V, 7 V
4	Microcomputer	μPD780024AGK
5	Heat exchanger sensor	———	10 kΩ at 25° C
	(TC-sensor)
6	Line filter (L01)	SS11V-06270	27mH, AC 0.6A
7	Diode (DB01)	D3SBA60	4A, 600 V
8	Capacitor (C03)	KMH450VSSN120M25C	120µF, 450 V
9	Fuse (F01)	FCU250V, 3.15A	T3.15A, 250 V
10	Power supply IC (IC01)	STR-L472
11	Varistor (R21, R109)	TND15G561K	560 V
12	Resistor (R01)	RF-5TK4R7	4.7Ω , 5 W
13	Louver motor	24BYJ48	12VDC

– 6 –

FILE NO. SVM-06036

5. CONTROL BLOCK DIAGRAM

5-1. Indoor Unit

Indoor Unit Control Panel

M.C.U.

Functions

Heat Exchanger Sensor

Operation

•

Louver Control

Display

•

3-minute Delay at Restart for Compressor

Temperature Sensor

Timer

•

Motor Revolution Control

Display

Infrared Rays Signal Receiver

•

Processing

Filter Sign

Display

(Temperature Processing)

Infrared

Initiallizing Circuit

•

Fan Only

Rays

Timer

Clock Frequency

Sign Display

Oscillator Circuit

Indoor Fan

Motor

Power Supply

Remote

Circuit

Outdoor unit

Louver ON/OFF Signal

ON/OFF Signal

Control

Noise Filter

Louver Driver

Louver Motor

From Outdoor Unit

Outdoor Unit

REMOTE CONTROLLER

RAS-M10GKV-E2, RAS-M13GKV-E2, RAS-M16GKV-E2 RAS-M10GKCV-E2, RAS-M13GKCV-E2, RAS-M16GKCV-E2

	(Heat pump model)				(Cooling only model)
	Infrared				Infrared
		Rays				Rays
	Remote Controller				Remote Controller
	Operation ( )				Operation ( )
	Operation Mode Selection				Operation Mode Selection
	AUTO, COOL, DRY, HEAT				AUTO, COOL, DRY, FAN ONLY
	Thermo. Setting				Thermo. Setting
	Fan Speed Selection				Fan Speed Selection
	ON TIMER Setting				ON TIMER Setting
	OFF TIMER Setting				OFF TIMER Setting
	Louver AUTO Swing				Louver AUTO Swing
	Louver Direction Setting				Louver Direction Setting
	ECONO.				ECONO.

– 7 –

FILE NO. SVM-06036

6. OPERATION DESCRIPTION

6-1. Outline of Air Conditioner Control

This air conditioner is a capacity-variable type air conditioner. The capacity proportional control compressor which can change the motor speed is mounted. The indoor unit motor drive circuit is mounted to the indoor unit. The compressor and the inverter to control outdoor unit motor are mounted to the outdoor unit. The entire air conditioner is mainly controlled by the indoor unit controller.

The indoor unit controller drives the indoor fan motor based upon command sent from the remote controller, and transfers the operation command to the outdoor unit controller.

The outdoor unit controller receives operation command from the indoor unit side, and controls the outdoor fan and the pulse modulating valve.

Besides, detecting revolution position of the compressor motor, the outdoor unit controller controls speed of the compressor motor by controlling output voltage of the inverter and switching timing of the supply power (current transfer timing) so that motors drive according to the operation command.

And then, the outdoor unit controller transfers reversely the operating status information of the outdoor unit to control the indoor unit controller.

As the compressor adopts four-pole brushless DC motor, the frequency of the supply power from inverter to compressor is two-times cycles of the actual number of revolution.

(1)Role of indoor unit controller

The indoor unit controller judges the operation commands from the remote controller and assumes the following functions.

∙Judgment of suction air temperature of the indoor heat exchanger by using the indoor temp. sensor.

∙Temperature setting of the indoor heat exchanger by using heat exchanger sensor (Prevent-freezing control)

∙Louver motor control

∙Indoor fan motor operation control

∙LED display control

∙Transferring of operation command signal (Serial signal) to the outdoor unit

∙Reception of information of operation status (Serial signal including outside temp. data) to the outdoor unit and judgment/display of error

(2)Role of outdoor unit controller

Receiving the operation command signal (Serial signal) from the indoor controller, the outdoor unit performs its role.

	∙ Compressor operation	Operations followed
	control
	∙ Operationcontrol of	to judgment of
		serial signal from
	outdoor fan motor

indoor side.

∙P.M.V. control

∙Detection of inverter input current and current release operation

∙Over-current detection and prevention operation to transistor module (Compressor stop function)

∙Compressor and outdoor fan stop function when serial signal is off (when the serial signal does not reach the board assembly of outdoor control by trouble of the signal system)

∙Transferring of operation information (Serial signal) from outdoor unit to indoor unit

∙Detection of outdoor temperature and operation revolution control

∙Defrost control in heating operation (Temp. measurement by outdoor heat exchanger and control for 4-way valve and outdoor fan)

(3)Contents of operation command signal (Serial signal) from indoor unit controller to outdoor unit controller

The following three types of signals are sent from the indoor unit controller.

∙Operation mode set on the remote controller

∙Compressor revolution command signal defined by indoor temperature and set temperature

(Correction along with variation of room temperature and correction of indoor heat exchanger temperature are added.)

∙For these two types of signals ( [Operation mode] and [Compressor revolution] ), the outdoor unit controller monitors the input current to the inverter, and performs the followed operation within the range that current does not exceed the allowable value.

∙Temperature of indoor heat exchanger by indoor heat exchanger sensor

(Minimum revolution control)

− 8 −

FILE NO. SVM-06036

(4)Contents of operation command signal (Serial signal) from outdoor unit controller to indoor unit controller

The following signals are sent from the outdoor unit controller.

•The current operation mode

•The current compressor revolution

•Outdoor temperature

•Existence of protective circuit operation

For transferring of these signals, the indoor unit controller monitors the contents of signals, and judges existence of trouble occurrence.

Contents of judgment are described below.

•Whether distinction of the current operation status meets to the operation command signal

•Whether protective circuit operates

When no signal is received from the outdoor unit controller, it is assumed as a trouble.

6-1-1. Capacity Control

The cooling capacity is varied by changing compressor motor speed. The inverter changes compressor motor speed by changing AC 220–240V power to DC once, and controls capacity by changing supply power status to the compressor with transis-tor module (includes 6 transistors). The outline of the control is as follows : The revolution position and revolution speed of the motor are detected by detecting winding electromotive force of the com pressor motor under operation, and the revolution speed is changed so that the motor drives based upon revolution speed of the operation command by changing timing (current transfer timing) to ex change inverter output voltage and supply power winding.

Detection of the revolution position for controlling is performed 12 times per 1 revolution of compressor.

The range of supply power frequency to the com pressor differs according to the operation status (COOL, DRY).

Table 6-1-1 Compressor revolution range

	Operation	No. of	Combination	Compressor		Operation	No. of	Combination	Compressor
		operating		revolution			operating		revolution
	mode	unit	of indoor units	(rps)		mode	unit	of indoor units	(rps)
			M10	20 to 28				M10	15 to 52
		1 unit	M13	20 to 43			1 unit	M13	15 to 63
			M16	20 to 53				M16	15 to 67
	COOL					HEAT
		2 units	*	20 to 66			2 units	*	15 to 90
		3 units	*	31 to 69			3 units	*	17 to 90
		4 units	*	31 to 69			4 units	*	22 to 90

* In case that any multiple indoor units are combined.

6-1-2. Current Release Control

6-1-3. Power Factor Improvement Control

The outdoor main circuit control section (Inverter assembly) detects the input current to the outdoor unit. If the current value with compressor motor speed instructed from indoor side exceeds the specified value, the outdoor main circuit control section controls compressor motor speed by reducing motor speed so that value becomes closest to the command within the limited value.

Power factor improvement control is performed mainly aiming to reduce the current on much power consumption of cooling/heating operation. Controlling starts from the time when input power has reached at a certain point. To be concrete, IGBT of the power factor improvement circuit is used, and the power factor is improved by keeping IGBT on for an arbitrary period to widen electro-angle of the input current.

− 9 −

6-1-4. Prevent-Freezing Control

The indoor heat exchanger sensor detects refrigerant vapor temperature in COOL/DRY operation. If the temperature is below the specified value, compressor motor speed is reduced so that operation is performed in temperature below the specified value to prevent-freezing of indoor heat exchanger.

6-1-5. P. M. V. (Pulse Modulating Valve)

Using P.M.V., refrigerant flow of refrigeration cycle is varied for the optimum temperature. Controlling each unit separately by four P.M.V. corresponds to difference of pipe length, fan speed, and unit temperature.

If an error occurs on cycle temperature when power source of the air conditioner has been turned on, and if start/stop times of the outdoor unit are 30 times, move the valve once until it hits on the stopper for positioning of the valve. In this case, ticktack sound may be heard.

FILE NO. SVM-06036

6-1-6. Louver Control

(1) Vertical air flow louvers

Positions of vertical air flow louvers are automatically controlled according to the operation status (AUTO, COOL, DRY, HEAT). Besides, positions of vertical air flow louvers can be arbitrarily set by pressing the [FIX] button. The louver position which has been set by the [FIX] button is stored in microcomputer, and the louver is automatically set at the stored position in the next operation.

(2) Swing

If the [SWING] button is pressed during running operation, vertical air flow louvers start swinging. When the [SWING] button is pressed again, swinging stops.

6-1-7. Indoor Fan Control

The indoor fan is operated by motor speed non-step variable drive system motor. For flow rate, motor speed is controlled manually in five steps and with the unit of 10 rpm from upper limit to lower limit in AUTO mode as described in Table 6-1-2. It is not selected by relay, so selecting sound does not generate.

Table 6-1-2

operation	Fan	Remote
mode	mode
		Control

M10

Motor speed	Air flow rate
(rpm)	(m3/h)

M13		M16
Motor speed	Air flow rate	Motor speed	Air flow rate
(rpm)	(m3/h)	(rpm)	(m3/h)

	H	HIGH	1190	570	1210	590	1350	650
Cooling	M+	MED+	1120	530	1130	530	1250	610
	M		1120	530	1130	530	1250	610
and Fan		MED	1050	490	1050	490	1150	550
only		LOW+			980	440	1070	500
			980	440
	L+	LOW	930	420	930	420	1000	460
	L		910	410	910	410	980	440
	L-		850	370	850	370	920	410
	L+		930	420	930	420	1000	460
DRY	L		910	410	910	410	980	440
	L-		850	370	850	370	920	410
	UL		720	290	750	310	920	410
	SUL		660	260	700	280	800	340
	H	HIGH	1250	610	1290	620	1370	660
	M+		1200	570	1280	620	1360	660
		MED+	1160	550	1200	570	1280	620
Heating	M	MED	1060	490	1100	520	1180	560
		LOW+	1000	460	1020	470	1100	520
	L+	LOW	1050	490	1050	490	1150	550
	L		940	420	940	420	1020	470
	L-		930	420	930	420	1000	460

NOTE :

• UL : Ultra Low, SUL : Super Ultra Low

− 10 −

FILE NO. SVM-06036

6-1-7. Outdoor Fan Control (DC Fan Motor)

Although the outdoor fan motor drives the outdoor fan by non-step variable system of the revolution speed, the revolution speed is restricted to three steps on the convenience of controlling.

If a strong wind is lashing outside of the room, the operation may be continued as the outdoor fan stops in order to protect the outdoor fan motor.

If a fan lock occurred due to entering of foreign matter, the air conditioner stops and an alarm is displayed.

<COOL, DRY>

Table 6-1-3

Compressor revolution (rps)							20.3	~ 50.3	~ 62.8	63.4 ~
Outdoor temp.			TO ≥		38°C		390 (rpm)	700 (rpm)	700 (rpm)	700 (rpm)
sensor		TO < 38°C			1 to 2 units		390 (rpm)	640 (rpm)	640 (rpm)	700 (rpm)
TO
					3 to 4 units		390 (rpm)	500 (rpm)	640 (rpm)	700 (rpm)
ECONO.			TO ≥		38°C		390 (rpm)	640 (rpm)	640 (rpm)	640 (rpm)
operation			TO < 38°C				390 (rpm)	500 (rpm)	500 (rpm)	500 (rpm)
	TO is abnormal						500 (rpm)	640 (rpm)	640 (rpm)	640 (rpm)
<HEAT>
						Table 6-1-4
Compressor revolution (rps)							20.3	~ 33.3	~ 33.9
Outdoor temp. sensor				TO ≥ 5°C			390 (rpm)	640 (rpm)	640 (rpm)
TO				TO < 5°C			500 (rpm)	640 (rpm)	640 (rpm)
ECONO. operation				TO ≥ 5°C			390 (rpm)	500 (rpm)	500 (rpm)
				TO < 5°C			390 (rpm)	500 (rpm)	500 (rpm)
	TO is abnormal						390 (rpm)	500 (rpm)	640 (rpm)

6-2. Description of Operation Circuit

•Turning [ON] the breaker flashes the operation lamp.

This is the display of power-ON (or notification of power failure).

•When pushing [ ] button of the remote controller, receive sound is issued from the main unit, and the next operations are performed together with opening the vertical air flow louvers.

6-2-1. Fan Only Operation

(The Remote controller [MODE] Button is Set to the FAN ONLY Operation)

•This mode is only for the cooling only model.

•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 [ ] button.

•When the [FAN] button is set to the AUTO position,

the indoor fan motor operates as shown in Fig. 6- 2-1. When the [FAN] button is set to LOW, LOW+ MED, MED+, or HIGH, the motor operates with a constant air flow.

•ECONO, Hi POWER and COMFORT SLEEP

mode cannot be set.

		˚C
		temp.)		+3
		(Set–		M+
				+2
				+2.5
				*1
		temp.)		*1
				+1.5
				*1
		(Room		+1
				L–
				+0.5
Set				0
temp.

(Set temp.) 25˚C

NOTE :

*1: Calculated from difference in motor speed of M+ and L–, and controlled.

Fig. 6-2-1 Auto setting of air flow

− 11 −

6-2-2. Cooling Operation

(The Remote controller [MODE] Button is Set to the COOL Position)

•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 [ ] button.

•A cooling operation signal is transmitted to outdoor unit.

•The indoor fan motor operates as shown in Fig.6- 2-2 when [FAN] button is set to AUTO.

•The motor operates with a constant air flow when the [FAN] button is set to LOW, LOW+, MED, MED+,

or HIGH.

∙The outdoor unit controls the outdoor fan relay R01, R02 and R03, and the compressor motor speed according to the operation command signal

sent from the indoor unit.

temp.)		˚C
		+3
(Set–		+2.5			M+
				*1
temp.)		+2
		+1.5		*1
(Room		+1		*1
					L–
		+0.5
Set			0
					In normal
temp.
			–0,5		operation

NOTE :

*1: Calculated from difference in motor speed of M+ and L–, and controlled.

Fig. 6-2-2 Setting of air flow [Air Flow AUTO]

FILE NO. SVM-06036

(1)Cooling capacity control

•The cooling capacity and room temperature are controlled by changing the compressor motor speed according to both the difference between the temperature detected by the room temperature sensor and the temperature set by [TEMP] button and also any change in room temperature.

•When compressor has been activated or reactivated, it operates with Max. 33 rps for 2 minutes and with Max. 57 rps from 2 to 4 minutes passed.

•When room temperature is lower than set temperature and indoor fan motor is operated at fan speed L– as shown in Fig. 6-2-2 while the outdoor unit stops.

(2)Prevent-freezing control

If temperature of indoor heat exchanger detected by the indoor heat exchanger sensor is 5°C or lower, compressor motor speed is gradually lowered to prevent freezing of the indoor heat exchanger. If temperature is 7°C or higher, return the operation to the above item (1).

(3)Current release control

The input current of compressor and outdoor fan motor (Precisely inverter main circuit control section) which occupy most of air conditioner input is detected by the outdoor current sensor, and compressor motor speed is gradually lowered so that current value does not exceed 11.5A if current value exceeds 11.5A. When the current value lowers to 11.0A, return the operation to the above item (1).

		Comp. motor
value	14.2	speed down
Current		Comp. motor
	13.7	speed keep
		Normal control

Fig. 6-2-3

(4) Outdoor temperature release control

The outdoor temperature release is controlled by changing the current release points 14.2 and 13.7 in the above item according to temperature detected by the outdoor temperature sensor.

For example, if the outdoor temperature is 43°C, the value of current release points becomes 9.6A.

− 12 −

(5)Limit for maximum compressor motor speed by indoor fan speed

When outdoor temperature sensor detected 32°C or lower, and indoor heat exchanger sensor detected 17°C or lower, the maximum compressor motor speed is limited by the indoor fan speed.

For example, when 1 unit only operates, the compressor motor speed is limited as described in the table below.

Table 6-2-1

Air flow	M10	M13	M16
rate	(rps)	(rps)	(rps)
HIGH	32	48	54
M+	29	42	46
MED	24	28	38
L	20	20	30
L–	20	20	30
UL	20	20	20
SUL	20	20	20

(6)Louver control

The vertical air flow louvers are automatically set to horizontal or cool memory position.

When temperature of indoor heat exchanger becomes 5°C or lower by the prevent-freezing control and the compressor is turned off, the vertical air flow louvers close once and then return to the position of previous time.

FILE NO. SVM-06036

(7)Discharge temperature control

The discharge temperature of refrigerant gas from the compressor is detected by the discharge temperature sensor, and controls operating compressor motor speed.

1)Control 1 (A zone) : Normal operation zone

When TD detect value is 101°C or lower, the operation is performed with operating motor speed instructed by the serial signal.

2)Control 2 (B zone) : Slow-up zone of motor speed

When TD detect value is 101°C or higher, operating motor speed is slowly up.

3)Control 3 (C zone) : Keep zone

When TD detect value is 108°C or higher, operating motor speed is not changed if raising operation speed.

4)Control 4 (D zone) : Slow down zone of motor speed

When TD detect value is 111°C or higher, operating motor speed is slowly down.

5)Control 5 (E zone) : Normal down of motor speed

When TD detect value is 115°C or higher, operating motor speed is down.

6)Control 6 (F zone) : Operation stop zone

If TD detect value exceeds 120°C during operation, stop the operation immediately.

Then, restart the operation when TD detect value becomes 108°C or lower.

	TD	Zone
	(˚C)	F	Operation stop zone
	120
		E	Normal down zone of motor speed
	115
			Release of motor speed
	111	D	Slow down of motor speed
		C	Keep zone : Motor speed is not changed.
	108
		B	Slow-up zone of motor speed
	101
		A	Normal operation zone

Fig. 6-2-4 Compressor motor speed control

– 13 –

FILE NO. SVM-06036

(8)ECONO operation control

When the [ECO] button is pushed, ECONO operation is performed by restraining air flow

and compressor motor speed. The set temperature is changed also.

Fig. 6-2-5

1)The set temperature increased 0.5°C per hour up to 2°C starting from the set temperature when ECONO has been received.

2)Indoor air flow is controlled between L+ and UL. The compressor motor speed in control as shown in Fig. 6-2-5

(9) COMFORT SLEET operation control.

When the [COMFORT SLEEP] button is pushed, the ECONO operation activate together with the timer OFF function. Each time of pressing [COMFORT SLEEP] button the off timer setting changes in the sequence of 1, 3, 5 or 9 hours.

(10)Hi POWER operation control.

When the [Hi POWER] button is pushed

Hi Power operation is performed by change set temperature and air flow (display on the remote control does not change).

1) Changing of set temperature.

Fig. 6-2-6

− 14 −

2) Changing of air flow (Fan setting : AUTO)

When the Hi POWER is started, the fan of the indoor unit operates at higher air flow level than

normal air flow AUTO (normal air flow AUTO

is shown in Fig. 6-2-2). Because of the

difference between room temperature and set temperature are increased automatically.

3)Changing of air flow (Fan setting : One of 5 levels)

When the Hi POWER is started, the fan of the indoor unit operates at higher consecutive air flow level. (Fan speed on the display of remote control does not change)

4)Changing of louver position

If the room temperature is higher than setting temperature by 3.5 °C or more, the louver is automatically set to the maximum air flow position. If it is not, position of louver is not change. When room temperature is reach to setting temperature. The louver moves back to set position.

(11)Quiet operation control.

When the [QUIET] button is pushed, the fan is restricted the revolution speed at L- level until the [QUIET] button is pushed once again (cancel QUIET operation).

Remarks :

QUIET operation is appropriate to work with less cooling load condition. Because of the fan speed L- may cause not enough the cooling capacity.

6-2-3. DRY Operation

(The Remote controller [MODE] Button is Set to the DRY Position)

∙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 [] button.

∙Dry operation signal is transmitted to outdoor unit.

∙The Cooling operation giving priority to dehumidifying, which restrains the indoor fan speed and compressor motor speed, is performed.

∙The indoor fan motor operates as shown in Fig.

6-2-7. (Fan speed is AUTO only.)

FILE NO. SVM-06036

∙The outdoor unit controls the outdoor fan relay R01, R02 and R03, and the compressor motor speed according to the operation command signal sent from the indoor unit.

	temp.)(Set	+2.5
		+2.0	L–
	–	+1.5
			*1
	temp.)
		+1.0
	(Room		SUL
		+0.5

Set 0 temp.

–0.5

NOTE :

*1 : Middle motor speed between L– and SUL

Fig. 6-2-7 Setting of air flow

(1)Dehumidifying-preferential Cooling capacity control

∙The cooling capacity and room temperature are controlled by changing the compressor motor speed according to both the difference between the temperature detected by the room temperature sensor and the temperature set by [TEMP] button and also any change in room temperature.

∙When the air conditioner operates in Dry mode, the maximum compressor motor speed is restricted.

M10 : Max. 20 rps

M13 : Max. 20 rps

M16 : Max. 22 rps

While multiple indoor units operate, compressor motor speed is calculated in the outdoor unit to operate.

∙ When room temperature is lower than set temperature, indoor fan motor is operated at fan speed SUL as shown in Fig. 6-2-7 while the outdoor unit stops.

∙ ECONO Hi POWER, QUIET and COMFORTSLEEP mode cannot be set.

∙ Other controls than the above-mentioned controls are common to those of cooling operation.

− 15 −

6-2-4. Heating Operation

Transferring of heating operation signal from indoor unit to outdoor unit starts.

The indoor fan motor operates by the room temperature when selecting "AUTO" of "FAN" as shown in

Fig. 6-2-8, and operates with a set air flow when selecting LOW to HIGH.

However, to prevent cold draft, revolution speed of the fan is restricted by indoor heat exchanger when air flow is AUTO (Fig. 6-2-9) and starting of FAN Manual.

[Basic control]

Set	0		LOW
temp.	-0.5
	-1	* 1
−	-1.5
temp.)	- 2		* 2
temp.)			M+
(Room (Set	-5.0
	-5.5

[FAN AUTO]	HIGH

*1, *2 : Approximate revolution speed of M+ and L to linear according to temperature.

Fig. 6-2-8 Setting of air flow

[Cold draft preventing control]

The upper limit of fan revolution speed is shown below.

				HIGH
44	33
43	32			Approximate
				revolution speed
31	20			of HIGH and SUL
				linear by Tc.
30	19			SUL*3
A + 4	A*2
				SUL ( NOTE : *1)
A - 8	A - 8
				Stop
FAN	Starting
	of FAN
AUTO
	Manual

Fig. 6-2-9 Cold draft preventing control

NOTES :

(1)Stops for 2 minutes after thermostat-OFF.

(2)24°C when the set temp. is 24°C or more

Set temp. when the set temp. is below 24°C

	FILE NO. SVM-06036
(3) SUL : Super ultra low
[In star ting and in stability]
	In star ting	In stability
	· Until 12 minutes	· When 12 to 25
	passed after	minutes passed
	operation start	after operation start
FAN	· When 12 to 25	and room temp. is
		higher than (set
AUTO	minutes passed
		temp. --3°C)
	after operation start
		· When 25 minutes or
	and room temp. is
	3°C or lower than	more passed after
	set temp.	operation start
FAN	· Room temp.³	· Room temp. >
Manual	Set temp. - 4°C	Set temp. -3,5°C

The outdoor unit controls the outdoor fan based upon the operation signal sent from the indoor unit, and also controls revolution speed of the compressor motor.

The power coupler (IC20) for four-way valve is turned on, and turned off in defrost operation.

(1)Heating capacity control

Calculate the difference between temperature detected by room temp. sensor every minute and the set temp. set on "Temp. indicator" and variation amount of room temp.

Then, obtain the correction amount of the command signal, and correct the current frequency command signal.

(2)High-temp. release control

If temperature of the indoor heat exchanger detected by the indoor heat exchanger sensor is 55°C or higher, compressor motor speed is gradually lowered to prevent over-temp. rising of compressed pressure.

If temperature becomes below 48°C, return to above item (1).

(3)Current release control

The input current of compressor and outdoor fan motor (Precisely inverter main circuit control section) which occupy most of air conditioner input is detected by the outdoor current sensor. The compressor motor speed is lowered gradually according to the range of TO (outside air temp.) if the input current exceeds the current value determined in each zone as shown in Fig. 6-2-10 so that the input current does not exceed the set value.

In case that the current lowered by approx. 0.3A to 0.5A than each set value, return to above item (1).

− 16 −