Toshiba RAS-M13NCKV-E, RAS-10NKV-E, RAS-M13NKCV-E, RAS-M10NKCV-E, RAS-M10NKV-E SERVICE MANUAL

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SERVICE MANUAL

AIR-CONDITIONER

RAS-M10NKV-E, RAS-M13NKV-E, RAS-M16NKV-E

FILE NO.SVM-05019

SUPPLEMENT

SPLIT TYPE

RAS-M10NKCV-E, RAS-M13NKCV-E, RAS-M16NKCV-E

(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

May, 2005

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

FILE NO. SVM-05019

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 –

1. SPECIFICATIONS

Specifications

RAS-M10NKV-E, RAS-M13NKV-E, RAS-M16NKV-E

FILE NO. SVM-05019

Power supply

Electric Unit model

characteristice Running current (A)

Power consumption (W)

Power factor (%)

Operating High dB (A)

noise Medium dB (A)

Low dB (A)

Dimension Height (mm)

Width (mm)

Depth (mm)

Net weight (kg)

Fan motor output (W)

Air flow rate

(Cooling/Heating)

Piping Type

connection Liquid side

Gas side

Refrigerant

Wiring connection (Interconnection)

(m3/h) 570/610 590/620 650/660

220/230/240V, 1Ph, 50/60Hz

RAS-M10NKV-E RAS-M13NKV-E RAS-M16NKV-E

0.15 0.15 0.15

303030

87 87 87

36/39

33/35

28/29

275 275275

790

218

∅6.35

∅9.52

4 wires : includes earth

39/40

35/35

28/29

Flare connection

∅6.35

∅9.52

R410A

790

218

42/42

39/39

33/33

790

218

∅6.35

∅12.7

RAS-M10NKCV-E, RAS-M13NKCV-E, RAS-M16NKCV-E

Power supply

Electric Unit model

characteristice Running current (A)

Power consumption (W)

Power factor (%)

Operating High dB (A)

noise Medium dB (A)

Low dB (A)

Dimension Height (mm)

Width (mm)

Depth (mm)

Net weight (kg)

Fan motor output (W)

Air flow rate (m3/h)

Piping Type

connection Liquid side

Gas side

Refrigerant

Wiring connection (Interconnection)

220/230/240V, 1Ph, 50/60Hz

RAS-M10NKCV-E RAS-M13NKCV-E RAS-M16NKCV-E

0.15 0.15 0.15

30 30 30

87 87 87

36 39 42

33 35 39

28 28 33

275 275 275

790 790 790

218 218 218

10 10 10

20 20 30

570 590 650

Flare connection

∅6.35

∅9.52 ∅9.52 ∅12.7

4 wires : includes earth

∅6.35 ∅6.35

R410A

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

– 2 –

Indoor Unit

FILE NO. SVM-05019

2. CONSTRUCTION VIEWS

Front panel

Knock out system

Air inlet

Air filter

Heat exchanger

790

275

Air outlet

120 80

590

Hanger

218

Knock out system

Drain hose (0.54m)

Hanger

Minimum distance to ceiling

275

170 or more

320

620

235 235

215 215

Minimum distance to ceiling

65 or more

Hanger

– 3 –

Connecting pipe (0.43m)

(Flare ∅6.35) Connecting pipe (0.33m) (For 10,13 series ; Flare ∅9.52

For 16 series ; Flare ∅12.7)

Hanger

For stud bolt (∅6)

Hanger

150150 160160 Installation plate outline

Center line

For stud bolt (∅8~∅10)

Minimum distance to ceiling

170 or more

9090

4519040

160

57 18

Wireless remote control

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

COLOR INDICATION

BROWN

BRW

RED

WHITE

WHI

YELLOW

YEL

BLUE

BLU

BLACK

BLK

GRAY

GRY

PINK

PNK

ORANGE

ORN

GREEN & YELLOW

GRN&YEL

GREEN

GRN

BLK BLK

HEAT EXCHANGER

SENSOR

(TC)

THERMO SENSOR

RECEIVING AND

INFRARED RAYS

MCC-861

(TA)

INDICATING PARTS

CN25 (WH I)

BLK

BLU

WHI

CN01 (BLU)

CN03 (WHI)

CN13 (WHI)

TERMINAL

BLOCK

MAIN P.C. BOARD

3. WIRING DIAGRAM

３

２

BLK WHI RED

CN23

CN24

FUSE

F01

T3.15A

250VAC

WP-004

CN21

LINE

FILTER

R04

CN11 CN10

YEL

CN08

JEM-A

Drive ci rcuit

GRY

150°C

Fan Motor

BRW

supply circ uit

+12 VDC

+5 VDC

INDOOR

UNIT

Power

BLK

WHI

FILE NO. SVM-05019

OUTDOOR

UNIT

CN07

(WH I)

WHI

RED

AC FAN MOTOR

YEL

LOUVER MOTOR

Simple Check for Failure Diagnosis

Chec k It em

Check to see if the OPERATION indicator goes on

OPERAT ION

INDICATOR

TERMINAL

(AC 220~24 0V)

and off when t he main s witch or b reaker is turned on. (Check the primary and secondary voltage of the transformer.)

Check the power supply voltage b etween and . (Refer to the name plate.) (Check the primary and secondary voltage of the transformer.)

BLOCK

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

FUSE

Check to see if the fuse blows out.

3.15A

(Check the R04 of the varis tor.)

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

DC5V

(Check the transform er and the pow er supply ci rcuit of the rated voltage.)

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

DC12V

(Check the transform er and the pow er supply ci rcuit of the rated voltage.)

Check the voltage at the No.1 pin on CN10 connecto r and CN24. (Check the F01)

Refer to the service data for the detailed failure diagnosis.

Diagnosis Result

– 4 –

3-2. Indoor Unit (For 16k)

COLOR INDICATION

BROWN

BRW

RED

WHITE

WHI

YELL OW

YEL

BLUE

BLU

BLACK

BLK

GRAY

GRY

PINK

PNK

ORANGE

ORN

GREEN & YE LLOW

GRN&YEL

GREEN

GRN

HEAT EXCHANGER

SENSOR

(TC)

THERMO SENSOR

(TA)

CN25 (WHI)

RECEIVING AND

INFRARED RAYS

INDICATING PARTS

MCC-861

CN01 (BLU)

BLK

CN03 (WHI)

BLK

CN13

(WHI)

BLU

BLU BLU BLU BLU BLU BLU BLU

BLU WHI

TERMINAL

BLOCK

FUSE

F01

T3.15A

250VAC

CN24

BLK

WHI

CN23

MAIN P.C. BOARD

MCC-867or MCC-5014

RED

R04

CN08

JEM-A

CN21

FILTER

LINE

R05

DB01

-+ ~

C03

INDOOR

UNIT

DC5V DC12V

FILE NO. SVM-05019

OUTDOOR

UNIT

CN10

(WHI)

CN07 (WHI)

CIRCUIT

POWER SUPPLY

FAN MOTOR

RED

BLK

WHI YEL BLU

DC MOTOR

WHI

YEL

LOUVER MOTOR

Simple Check for Failure Diagnosis

Check Item

OPERATION

INDICATOR

TERMINAL

BLOCK

(DC310 340V)

DC12V

DC325V

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 (Refer to the name plate.) (Check the primary and secondary voltage of the transformer.) Check the fluctuating voltage between and . (15

60VDC)

Check to see if the fuse blows out.

FUSE

(Check the R04 of the varistor.)

3.15A

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

DC5V

(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 connector. (Check the DB01, R05 and C03.)

Refer to the service data for the detailed failure diagnosis.

Diagnosis Result

– 5 –

FILE NO. SVM-05019

4. SPECIFICATIONS OF ELECTRICAL PARTS

RAS-M10NKV-E, RAS-M13NKV-E RAS-M10NKCV-E, RAS-M13NKCV-E

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 5 Heat exchanger sensor

(TC-sensor) 6 Line filter (L01) SS11V-06270 27 µH , AC 0.64A 7 Diode (DB01) KBP06M 1.5A, 420V 8 Capacitor (C50) 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) 15G561K 560 V

µPD780024AGK

——— 10 kΩ at 25°C

LXV35VB2200MJ20 2200 µF, 35V

13 Louver motor 24BYJ48 DC 12V

RAS-M16NKV-E, RAS-M16NKCV-E

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

(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) 15G561K 560 V

——— 10 kΩ at 25°C

12 Resistor (R01) RF-5TK4R7 4.7Ω, 5 W

13 Louver motor 24BYJ48 12VDC

– 6 –

5. CONTROL BLOCK DIAGRAM

FILE NO. SVM-05019

5-1. Indoor Unit

Heat Exchanger Sensor

Temperature Sensor

Infrared Rays Signal Receiver

Infrared

Rays

Remote

Control

Initiallizing Circuit

Clock Frequency Oscillator Circuit

Power Supply

Circuit

Noise Filter

Indoor Unit Control Panel

M.C.U.

Functions

• Louver Control

• 3-minute Delay at Restart for Compressor

• Motor Revolution Control

• Processing

(Temperature Processing)

• Timer

Outdoor unit

ON/OFF Signal

Louver ON/OFF Signal

Louver Driver

Operation

Display

Timer

Display

Filter Sign

Display

Fan Only

Sign Display

Indoor Fan

Motor

Louver Motor

From Outdoor Unit

REMOTE CONTROLLER

RAS-M10NKV-E, RAS-M13N

(Heat pump model)

Remote Controller

Operation ( )

Operation Mode Selection

AUTO, COOL, DRY, HEAT

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

KV-E, RAS-M16NKV-E

Infrared

Rays

Outdoor Unit

RAS-M10NKCV-E, RAS-M13N

(Cooling only model)

Remote Controller

Operation ( )

Operation Mode Selection

AUTO, COOL, DRY, FAN ONLY

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

Louver AUTO Swing

Louver Direction Setting

KCV-E, RAS-M16NKCV-E

Infrared

Rays

ECONO.

– 7 –

6. OPERATION DESCRIPTION

FILE NO. SVM-05019

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 ex-

changer 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

control

• Operation control of

outdoor fan motor

•

P.M.V. control

• Detection of inverter input current and current

release operation

• Over-current detection and prevention opera-

tion 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 opera-

tion 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)

Operations followed





to judgment of serial signal from



indoor side.



− 8 −

FILE NO. SVM-05019

(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

mode

COOL

No. of

operating

unit

1 unit

2 units

3 units

4 units

Combination

of indoor units

M10

M13

M16

Compressor

revolution

(rps)

20 to 28

20 to 43

20 to 53

20 to 66

31 to 69

* In case that any multiple indoor units are combined.

6-1-2. Current Release 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.

Operation

mode

HEAT

No. of

operating

unit

1 unit

2 units

3 units

4 units

Combination

of indoor units

M10

M13

M16

Compressor

revolution

(rps)

15 to 52

15 to 63

15 to 67

15 to 90

17 to 90

22 to 90

6-1-3. Power Factor Improvement Control

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 −

FILE NO. SVM-05019

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.

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.

operation

mode

Cooling

and Fan

only

DRY

Heating

Table 6-1-2

Fan

mode

H M+

L+ L LL+ L L-

SUL

H M+

L+ L L-

Remote

Control

HIGH

MED+ MED LOW+

LOW

HIGH

MED+ MED LOW+

LOW

Motor speed

(rpm)

M10

Air flow rate

(m3/h)

1190

1120 1120 1050

980 930

910 850 930

910

850

720

660 1250 1200 1160 1060

1000

1050

940 930

570 530 530

490

440

420

410

370

420 410 370 290 260 610 570 550 490 460 490

420 420

Motor speed

(rpm)

1210

1130 1130 1050

M13

Air flow rate

980 930 910 850 930

910 850 750

700 1290 1280 1200 1100

1020 1050

940 930 420

(m3/h)

590 530 530 490 440

420

410

370

420

410 370 310 280

620

570 520 470 490

420

M16

Motor speed

(rpm)

Air flow rate

1350

1250 1250 1150

1070

1000

980 920 410

1000

980 920 920 800

1370

1360 1280 1180

1100

1150 1020

1000 460

(m3/h)

650 610 610 550 500 460

440

460 440

410 410 340

660 660 620

560 520 550

470

NOTE :

• UL : Ultra Low, SUL : Super Ultra Low

− 10 −

FILE NO. SVM-05019

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)

Outdoor temp.

sensor

ECONO.

operation

TO ≥ 38°C

TO < 38°C

TO ≥ 38°C

TO < 38°C

TO is abnormal

1 to 2 units 3 to 4 units

20.3

390 (rpm) 700 (rpm) 700 (rpm) 700 (rpm) 390 (rpm) 640 (rpm) 640 (rpm) 700 (rpm) 390 (rpm) 500 (rpm) 640 (rpm) 700 (rpm) 390 (rpm) 640 (rpm) 640 (rpm) 640 (rpm) 390 (rpm) 500 (rpm) 500 (rpm) 500 (rpm) 500 (rpm) 640 (rpm) 640 (rpm) 640 (rpm)

~ 50.3 ~ 62.8 63.4 ~

<HEAT>

Table 6-1-4

Compressor revolution (rps)

Outdoor temp. sensor TO ≥ 5°C

TO TO < 5°C

ECONO. operation

TO ≥ 5°C TO < 5°C

TO is abnormal

20.3 ~ 33.3 ~ 33.9

390 (rpm) 640 (rpm) 640 (rpm) 500 (rpm) 640 (rpm) 640 (rpm) 390 (rpm) 500 (rpm) 500 (rpm) 390 (rpm) 500 (rpm) 500 (rpm) 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 po wer 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. 62-1. 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.

− 11 −

˚C

+3 +2.5 +2 +1.5 +1 +0.5

(Room temp.) – (Set temp.)

Set 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

M+ *1 *1 *1 L–

FILE NO. SVM-05019

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.62-2 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.

˚C

+2.5

+1.5

(Room temp.) – (Set temp.)

+0.5

Set temp.

0 –0,5

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]

M+

*1 L–

In normal operation

(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 pre vent 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

14.2

13.7

Current value

Normal control

speed down

Comp. motor speed keep

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 −

FILE NO. SVM-05019

(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

rate

HIGH

M+

MED

L–

SUL

M10 M13 M16

(rps) (rps) (rps)

32 48 54 29 42 46 24 28 38 20 20 30 20 20 30 20 20 20 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.

(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.

(˚C)

120

115

111

108

101

Zone

Operation stop zone

Normal down zone of motor speed

Slow down of motor speed

Keep zone : Motor speed is not changed.

Slow-up zone of motor speed

Normal operation zone

Fig. 6-2-4 Compressor motor speed control

– 13 –

Release of motor speed

FILE NO. SVM-05019

(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.

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.

Fig. 6-2-5

(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 −

FILE NO. SVM-05019

–0.5

+0.5

+1.0

+1.5

+2.0

+2.5

L–

SUL

(Room temp.) – (Set temp.)

Set temp.

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 dehumidi-

fying, 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.)

• 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.

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 tempera-

ture, indoor fan motor is operated at fan speed SUL as shown in Fig. 6-2-6 while the outdoor unit stops.

• ECONO Hi POWER, QUIET and COMFORT-

SLEEP mode cannot be set.

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

− 15 −

6-2-4. Heating Operation

44 43

20 19

31 30

−

A + 4 A

−

HIGH

SUL

FAN

AUTO

Starting of FAN Manual

Approximate revolution speed of HIGH and SUL linear by Tc.

Stop

( NOTE : *1)

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 sta

rting of FAN

Manual.

[Basic control]

(3) SUL : Super ultra low

[In star ting and in stability]

In star ting

• Until 12 minutes

passed after operation start

FAN AUTO

• When 12 to 25

minutes passed after operation start and room temp. is 3°C or lower than set temp.

FILE NO. SVM-05019

In stability

• When 12 to 25

minutes passed after operation start and room temp. is higher than (set temp. --3°C)

• When 25 minutes or

more passed after operation start

Set temp.

−

(Room temp.)

(Set temp.)

1, *2 : Approximate revolution speed of M+ and L to

−0.5

−

1.5

−

5.0

−

5.5

[FAN AUTO]

LOW

M+

HIGH

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.

FAN Manual

• Room temp.≥  Set temp. − 4°C

• Room temp. > 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).

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

(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 −

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