Toshiba RAS-M10YDCV-E, RAS-M13YDV-E, RAS-M13YDCV-E, RAS-M16YDV-E, RAS-M16YDCV-E Service Manual

R410A

Heat Pump Model Cooling Only Model

RAS-M10YDV-E RAS-M10YDCV-E
RAS-M13YDV-E RAS-M13YDCV-E
RAS-M16YDV-E RAS-M16YDCV-E

PRINTED IN JAPAN, Jul., 2002 ToMo

– 2 –

CONTENTS

APPLICATION .........................................................................................................................2

1. PRECAUTIONS FOR SAFETY........................................................................................3

2. SPECIFICATIONS ...........................................................................................................5

3. CONSTRUCTION VIEWS ................................................................................................7

4. WIRING DIAGRAM ..........................................................................................................8

5. SPECIFICATIONS OF ELECTRICAL PARTS .................................................................9

6. REFRIGERANT CYCLE DIAGRAM ..............................................................................10

7. CONTROL BLOCK DIAGRAM ......................................................................................11

8. OPERATION DESCRIPTION.........................................................................................12

9. INSTALLATION PROCEDURE......................................................................................22

10. DRAIN-UP KIT (Option) ................................................................................................37

11. WIRED REMOTE CONTROLLER (Option) ..................................................................41

12. HO W TO DIA GNOSE THE TROUBLE............................................................................45

13. HOW TO REPLACE THE MAIN PARTS ........................................................................57

14. EXPLODED VIEWS AND PARTS LIST .........................................................................59

Outdoor unit

Heat Pump

4M27YAV-E

Model 3M26YAV-E
RAS-

M18YAV-E

Cooling Only

4M27YACV-E

Model 3M23YACV-E
RAS-

M18YACV-E

Reference Service Manual

File No. A01-0004
File No. A01-0004
File No. A00-9906
File No. A01-0004
File No. A01-0002
File No. A00-9906

Product name

Drain-up kit
Wired remote controller

Model name

RB-F81E

RBC-SH-A1LE

Indoor unit

Outdoor unit
Heat Pump

4M27YAV-E

Model 3M26YAV-E
RAS-

M18YAV-E

Cooling Only

4M27YACV-E

Model 3M23YACV-E
RAS-

M18YACV-E

Heat Pump Model RAS- Cooling Only Model RAS-

M10YDV-E M13YDV-E M16YDV-E M10YCDV-E M13YCDV-E M16YCDV-E

¡¡¡×××
¡¡¡×××
¡¡××××

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××ס¡×

APPLICATION

1. Combination List of Indoor/Outdoor Units (¡: Possible ×: Impossib le)

2. File No. List of Reference Service Manual (Outdoor Units of Multi Air Conditioner)

3. F or the details of the specifications of each
indoor/outdoor unit to be combined, refer to the
next page and after pages with the abov e service
manuals.

4. Optional Parts List

– 3 –

1. PRECAUTIONS FOR SAFETY

For general public use

Po w er supply cord of Outdoor unit shall be more than 2.5mm² (H07RN-F or 245 IEC66) polychloroprene
sheathed flexible cord.

• Read this “Precautions for Safety” carefully before servicing.

• The precautions described below include the important items regarding safety. Observe them without fail.

• After the servicing work, perform a trial operation to check for any problem.

• Turn off the main power supply switch (or breaker) before the unit maintenance.

CAUTION New Refrigerant Air Conditioner Servicing

• THIS AIR CONDITIONER ADOPTS THE NEW HFC REFRIGERANT (R410A) WHICH DOES NOT
DESTROY OZONE LAYER.

The characteristics of R410A refrigerant is easy to absorb water , oxidizing membrane or oil, and its pressure
is approx. 1.6 times of refrigerant R22. Accompanied with adoption of the new refrigerant, refrigerating oil
has been also changed. Therefore, during servicing work, be sure that water, dust, f ormer refrigerant, or
refrigerating oil does not enter into the refrigerating cycle of new refrigerant air conditioner.

To prevent from mixing of refrigerant and refrigerating oil, the sizes of connecting sections of charging port of
the main unit or installation tools are different from those f or the con ventional refrigerant.

Accordingly, the exclusive tools are required for the new refrigerant (R410A).
For connecting pipes, use ne w and clean piping materials with high pressure-tight f orce, which were made for

R410A only, so that water or dust does not enter. Moreover, do not use the existing piping because there are
problems about pressure-tight force and impurity it.

CAUTION To Disconnect the Appliance from the Main Power Supply.

This appliance must be connected to the main power supply by means of a circuit breaker or a switch with a
contact separation of at least 3 mm.

If this is not possible, a pow er supply plug with grounding must be used. This plug must be easily accessible
after installation. The plug must be disconnected from the power supply socket in order to disconnect the
appliance completely from the mains.

The installation fuse (25A D type ) must be used for the power supply line of this condi­tioner.

W ARNINGS

• Ask an authorized dealer or qualified installation professional to install/maintain the air
conditioner.

Inappropriate servicing may result in water leakage, electric shock or fire.

• Turn off the main power supply switch or breaker before attempting any electrical work.

Make sure all power switches are off. Failure to do so may cause electric shock.

• Connect the connecting cable correctly.

If the connecting cable is connected by wrong way, electric parts may be damaged.

• When moving the air-conditioner for installing it in another place again, be very careful not to
get the specified refrigerant with any other gaseous body into the refrigeration cycle.

If air or any other gas is mixed in the refrigerant, the gas pressure in the refrigeration cycle becomes
abnormally high and it resultingly causes burst of the pipe and injuries on persons.

– 4 –

• Never modify this unit by removing any of the safety guards or by by-passing any of the
safety interlock switches.

• Exposure of unit to water or other moisture before servicing may cause a short circuit.

Do not store it in a wet basement or expose to rain or water.

• After unpacking the unit, examine it carefully for possible damage.

• Do not install in a place that can increase the vibration of the unit.

• To avoid personal injury, be careful when handling parts with sharp edges.

• Perform installation work properly according to the Installation Manual.

Inappropriate installation may result in water leakage, electric shock or fire.

• When installing the air conditioner in a small room, provide appropriate measures to ensure
that the concentration of refrigerant in the room does not exceed the critical level should
leakage occur.

It is not dangerous refrigerant; it has not toxicity or combustibility. However, a concentration abo ve 0.3kg/m³
as criterion still causes suffocation. The volume of refrigerant charged to the Multi System air conditioner is
more than the volume charged to a conventional individual system.

• Install the air conditioner securely in a location where the weight of the unit can be sustained
adequately.

• Perform the specified installation work to guard against an earthquake.

If the air conditioner is not installed appropriately, accidents may occur due to the falling unit.

• If refrigerant gas has leaked during the servicing work, ventilate the room immediately.

If the leaked refrigerant gas comes in contact with fire, noxious gas may generate.

• After the installation work, confirm that refrigerant gas does not leak.

If refrigerant gas leaks into the room and flows near a fire source, such as a cooking range, noxious gas
may generate.

• The electrical work must be performed by a qualified electrician in accordance with the Instal­lation Manual. Make sure the air conditioner uses an exclusive circuit.

An insufficient circuit capacity or inappropriate installation may cause fire.

• When wiring, use the specified cables and connect the terminals securely to prevent external
forces applied to the cable from affecting the terminals.

• Be sure to provide grounding.

Do not connect ground wires to gas pipes, water pipes , lightning rods or ground wires for telephone cables.

• Conform to the regulations of the local electric company when wiring the power supply.

Inappropriate grounding may cause electric shock.

• Do not install the air conditioner in a location subject to a risk of exposure to combustible
gas.

Otherwise, the combustib le gas leaks, stays around the unit and a fire may occur.

– 5 –

Indoor unit model name

Cooling capacity (kW)
Cooling capacity range (kW)
Heating capacity (kW)
Heating capacity range (kW)
Power supply (Ø-V-Hz)

Electric characteristics

Operation current (A)
Power consumption (W)

*

2

Power factor (%)
Blower
Blower motor output (W)
Blower speed

Blower unit

Air flow (Cooling High *3) (m³/h)
Air flow (Heating High *3) (m³/h)
External static pressure (Pa)

(Upper limit)
External static pressure (Pa)

(Standard)
Cooling (high) (dB)
Cooling (Medium) (dB)

Sound level *4

Cooling (Low) (dB)
Heating (high) (dB)
Heating (Medium) (dB)
Heating (Low) (dB)
Height (mm)

Dimension Width (mm)

Depth (mm)
Net weight (kg)
Connecting type

Connecting pipe

Liquid side (mm)

Gas side (mm)
Refrigerant
Wiring connection Interconnection
Usable temperature range (°C)

Wireless remote controller

Remote controller holder

Mounting screws

Drain hose

Accessory

Elbow thermal-insulation cover

Batteries (Manganese)

Black screws

Tapping screws

Owner’s manual

Installation manual

RAS-M10YDV-E RAS-M13YDV-E RAS-M16YDV-E

2.7 3.7 4.5

*

1

*

1

*

1

4.0 5.0 5.5

*

1

*

1

*

1

1Ø 220 – 240 V, 50 Hz / 220 V, 60 Hz

0.59
110

81

Multi-blade blower

60

5 (Low, Low+, Med, Med+, High)
720 780 780
720 780 780

54.9 63.7 63.7

(5.6 mmAq) (6.5 mmAq) (6.5 mmAq)

35.3 41.2 41.2

(3.6 mmAq) (4.2 mmAq) (4.2 mmAq)

31 32 33
27 28 29
23 24 25
32 33 34
28 29 30
24 25 26

750
230
440

19

Full Operation
Ø6.35 Ø6.35 Ø6.35
Ø9.52 Ø9.52 Ø12.7

R410A

4 wires : includes earth

21 – 32 / 0 – 28

1
1

2 (Ø3.5 x 16 L)

1
1
2
2

16

1
1

2. SPECIFICATIONS

RAS-M10YDV-E, RAS-M13YDV-E, RAS-M16YDV-E (Heat Pump Model)

*

1 : Refer to the service manual of the outdoor unit to be combined.

*

2 : Electrical characteristics at High fan speed under standard static pressure.

*

3 : Airflow volume at standard static pressure.

*

4 : Sound levels at standard static pressure are measured under the conditions specified by JIS B 8616.

Notes :

• For performance when each indoor unit combined with other unit, refer to the service manual of outdoor unit.

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

– 6 –

Indoor unit model name

Cooling capacity (kW)
Cooling capacity range (kW)
Power supply (Ø-V-Hz)

Electric characteristics

Operation current (A)
Power consumption (W)

*

2

Power factor (%)
Blower
Blower motor output (W)
Blower speed

Blower unit Air flow (Cooling High *3) (m³/h)

External static pressure (Pa)
(Upper limit)

External static pressure (Pa)
(Standard)

Cooling (high) (dB)

Sound level *4 Cooling (Medium) (dB)

Cooling (Low) (dB)
Height (mm)

Dimension Width (mm)

Depth (mm)
Net weight (kg)
Connecting type

Connecting pipe

Liquid side (mm)

Gas side (mm)
Refrigerant
Wiring connection Interconnection
Usable temperature range (°C)

Wireless remote controller

Remote controller holder

Mounting screws

Drain hose

Accessory

Elbow thermal-insulation cover

Batteries (Manganese)

Black screws

Tapping screws

Owner’s manual

Installation manual

RAS-M10YDCV-E RAS-M13YDCV-E RAS-M16YDCV-E

2.7 3.7 4.5

*

1

*

1

*

1

1Ø 220 – 240 V, 50 Hz / 220 V, 60 Hz

0.59
110

81

Multi-blade blower

60

5 (Low, Low+, Med, Med+, High)

720 780 780

54.9 63.7 63.7

(5.6 mmAq) (6.5 mmAq) (6.5 mmAq)

35.3 41.2 41.2

(3.6 mmAq) (4.2 mmAq) (4.2 mmAq)

31 32 33
27 28 29
23 24 25

750
230
440

19

Full Operation
Ø6.35 Ø6.35 Ø6.35
Ø9.52 Ø9.52 Ø12.7

R410A

4 wires : includes earth

21 – 32

1
1

2 (Ø3.5 x 16 L)

1
1
2
2

16

1
1

RAS-M10YDCV-E, RAS-M13YDCV-E, RAS-M16YDCV-E (Cooling Only Model)

*

1 : Refer to the service manual of the outdoor unit to be combined.

*

2 : Electrical characteristics at High fan speed under standard static pressure.

*

3 : Airflow volume at standard static pressure.

*

4 : Sound levels at standard static pressure are measured under the conditions specified by JIS B 8616.

Notes :

• For performance when each indoor unit combined with other unit, refer to the service manual of outdoor unit.

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

– 7 –

3. CONSTRUCTION VIEWS

13

750

24.5

142

200

31

156.5

230

730 (Hanging bolt pitch)

Refrigerant pipe
connecting port
(Liquid side Ø6.35)

Drain-up kit
RB-F81E
(Accessory sold separately)

Drain piping connecting port
(Nominal Ø20 Vinyl chloride pipe)

Gas side D

Duct connecting flange
(Require at site)

Duct connecting flange
(Require at site)

640 (Inside flange)

216.2
(Inside flange)

19.7

650 (Inside flange)

228

(Inside flange)

440

29.7

350

(Hanging bolt pitch)

40

118 211

612

D

Ø9.52
Ø12.7

Model

M10
M13
M16

– 8 –

Diagnosis result

Check to see if the OPERATION indicator goes on and off when the main
switch or breaker is turned on. (Check the transformer and receiver unit.)

Check the power supply voltage between  and . (Refer to the name
plate.) (Check the primary and secondary voltage of the transformer.)
Check for fluctuate voltage between



and .

Check to see if the fuse blows out.
(Check the R01 of the Varistor.)

Check the voltage between  and  on CN11 connector.
(Check the transformer and the power supply circuit of the rated voltage.)

Check the voltage between  and  on CN14 connector.
(Check the transformer and the power supply circuit of the rated voltage.)

Check items

OPERATION
indicator

Terminal
block

Fuse

6.3A

DC 5V

DC 12V

Color

Identification

BRW : BROWN

RED : RED

WHI : WHITE
YEL : YELLOW
BLU : BLUE

BLK : BLACK
GRY : GRAY
PNK : PINK

ORN : ORANGE
GRN : GREEN

PUR : PURPLE

GRN : GREEN &

&YEL YELLOW

1

2

3

4

5

RED

BLK

WHI

BLU
PUP
GRY

BLK
WHI

RED
BLU

PUR
GRY

BLK

HEAT

EXCHANGER

SENSOR

(TC)

INFRARED RAYS

RECEIVING AND

INDICATING PARTS

MAIN P.C. BOARD

MCC-875

DRAIN-UP KIT

(OPTION)

FAN MOTOR

3

4

2

5

1

5

1 2 3 4 5

1 2

1 2

1 2

1 2 1 2 3

1 2

3

1

3

1

2
1

3

2
1

3

2
1

3

2
1

3

2

1

3

1

3

5

3

1

313

1

3

1

3 4 5

4

3

2

1

5

4

3

2

1

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

9

1

2

3

4

5

6

7

8

9

SWITCH P.C. BOARD

MCC-605

BLK

BLK

BLK

212

1

THERMO
SENSOR

(TA)

TRANSFORMER

FLOAT

SWITCH

BLK

BLK

BLK

BLK

212

1

2

4321

1

212

1

WHI

CN11

CN05

CN12

CN13

CN07

CN17 CN04 CN03

DRAIN-PUMP

MOTOR

CN20

CN01

CN19

CN06

CN30

CN15

CN14

CN09

P02P03

MF-CAPA

R01

RY01

GRY
GRN
BLU

WHI
BLK
RED
BLU
BLU

YEL
BLK
BLU

ORN

FUSE

T6, 3A, AC 250V

1Ø
AC220 –240V / 50Hz
AC220V / 60Hz

CONNECTION
CABLE

INDOOR
TERMINAL
BLOCK

RED

WHI

EARTH

EARTH

RED

BLK

WHI

GRY
GRY

WHI

RED

BLU
PUR
GRY

2
1

4

2
1 2

1

3

2

1

3

4

YEL
ORN
RED

BRW

R02

R03

SG01

4. WIRING DIAGRAM

Table 4-1-1 Quick check for failure dia gnosis

Refer to the service data for the detailed failure diagnosis.

– 9 –

No.

1

2
3
4
5

6

7

8
9

10

Parts name

Fan motor (for indoor)

Thermo. sensor (TA-sensor)
Transformer
Microcomputer
Heat exchanger sensor

(TC-sensor)
Line filter (L02)

Running capacitor
(for indoor fan motor)

Fuse (F01)
Var istor (R01, R02, R03)
Drain pump control relay

Type

MF-200-60-4B

( – )

TT-03-3

TMP87PM40AN

( – )

HF-2430-253Y0R8
CMPS45B155UYF
CMPS45B305UYF

TSCR6.3A

15G471K

G2R-1-H

Specifications

Output (Rated ) 60W, 4 pole, 1 phase,
220 – 240, 50Hz/220, 60Hz

Winding resistance (Ω)

M coil A coil

at 20°C

73.8 100
10kΩ at 25°C
AC 240V, Secondary DC 15V/DC 500mA

10kΩ at 25°C

25mH, AC 0.8A

1.5µF, AC 450V (M10, M13)

3.0µF, AC 450V (M16)
T6.3A, AC 250V
470V
10A, AC 250V

5. SPECIFICATIONS OF ELECTRICAL PARTS

5-1. Indoor Unit

– 10 –

INDOOR UNIT

Evaporator

Allowable height difference

Allowable pipe length

Connecting pipe
Thickness : 0.8mm
Ø6.35

NOTE : Gas leak check position

Refrigerant flow (Cooling)
Refrigerant flow (Heating

*

1)

*

1 : Heat pump model only

Connecting pipe
Thickness : 0.8mm
Ø9.52

Sectional shape
of heat insulator

OUTDOOR UNIT

TA

Multi-blade fan

INDOOR UNIT

Evaporator

Allowable height difference

Allowable pipe length

Connecting pipe
Thickness : 0.8mm
Ø6.35

Connecting pipe
Thickness : 0.8mm
Ø12.7

Sectional shape
of heat insulator

OUTDOOR UNIT

TA

Multi-blade fan

•

•

TC

TC

6. REFRIGERANT CYCLE DIAGRAM

RAS-M10YDV-E, RAS-M10YDCV-E
RAS-M13YDV-E, RAS-M13YDCV-E

RAS-M16YDV-E, RAS-M16YDCV-E

• The allowable pipe length, charge amount of refrigerant, and allowable height diff erence differ according to the
outdoor unit to be combined.

For details, refer to the service manual of the outdoor unit to be combined.

– 11 –

7. CONTROL BLOCK DIAGRAM

7-1. Indoor Unit

Remote controller

Functions

• Drain Pump Control

• 3-minutes Delay at Restart for Compressor

• Motor Revolution Control

• Processing

(Temperature Processing)

• Timer

• Serial Signal Communication

M.C.U

Indoor Unit P.C. Board (MMC-875)

From Outdoor Unit

Remote

Controller

Serial Signal Communication

Serial Signal Transmitter/Receiver

Drain Pump Relay

Noise Filter

Float Switch

Drain Pump

Option

Operation Display

Drain Pump ON/OFF Signal

Heat Exchanger Sensor

Temperature Sensor

Infrared Rays Signal Receiver

Initializing Circuit

Clock Frequency

Oscillator Circuit

Power Supply

Circuit

Infrared

Rays

Wireless Remote Controller

RAS-M10YDV-E, M13YDV-E, M16YDV-E

(Heat Pump Model)

RAS-M10YDCV-E, M13YDCV-E, M16YDCV-E

(Cooling Only Mpdel)

Operation (START/STOP)

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

ECO (SLEEP)

Hi-POWER

Operation Mode Selection

AUTO, COOL, DRY, HEAT

Infrared

Rays

Wireless Remote Controller

Operation (START/STOP)

Thermo. Setting

Fan Speed Selection

ON TIMER Setting

OFF TIMER Setting

ECO (SLEEP)

Hi-POWER

Operation Mode Selection

AUTO, COOL, DRY, FAM ONLY

Infrared

Rays

Timer Display

Indoor Fan Motor

Check Display

Voltage setup &

TEMPORARY Switch

– 12 –





8. OPERATION DESCRIPTION

8-1. Outline of Air Conditioner Control

This air conditioner is a capacity-variable type air
conditioner, which uses A C motor for the indoor fan
motor and DC motor for the outdoor fan motor. And
the capacity-proportional control compressor which
can change the motor speed in the range around
from 20 to 100 rps is mounted. The AC motor drive
circuit is mounted to the indoor unit. The compres­sor and the inverter to control outdoor fan 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. (PMV)

Besides, detecting rev olution 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)

• 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) from
the outdoor unit and judgment/display of fail.

(2) Role of outdoor unit controller

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

• Compressor operation
control

• Operation control of
outdoor fan motor

• PMV control

Operations fol­lowed to judgment
of serial signal
from indoor side.

• 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)

• T r ansferring of operation information (Serial
signal) from outdoor unit to indoor unit

• Detection of outdoor temperature and opera­tion revolution control

• Defrost control in heating operation ((Heat
pump model only) Temp. measurement by
outdoor heat exchanger and control f or 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 rev olution] ), 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 rev olution control)

– 13 –

Operation mode

COOL

HEAT

Fan mode

H

L

H

L

Fan speed (rpm)

M10 M13 M16
900 to 1150 950 to 1200 1000 to 1250
600 to 800 650 to 850 700 to 900
900 to 1150 950 to 1200 1000 to 1250
650 to 850 700 to 900 750 to 950

8-1-2. 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.

8-1-3. Indoor Fan Control (AC Fan Motor)

The indoor fan is operated by motor speed non-step
variable AC phase control driv e system. For airflow
rate, motor speed is controlled manually in five steps
(LOW, LOW+, MED , MED+, HIGH), or automatically in
AUTO mode adjusted according to the room tem­perature. It is not selected by relay, so selecting
sound does not generate.

Table 8-1-1 shows the f an speed.
This indoor unit performs the phase output constant

control of the fan motor .
(Does not control the revolution speed.)

Since the fan speed varies according to the ex ternal
static pressure, the values described in the table are
criteria to confirm the motors, etc. However, the
maximum revolution speed is limited to 1300rpm for
protection of the terminal voltage of the running
capacitor.

Table 8-1-1 Reference fan speed

(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 transf erring 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 coincide with the operation command
signal

• Whether protective circuit operates
When no signal is received from the outdoor

unit controller, it is assumed as a troubl e .

8-1-1. Capacity Control

The cooling capacity is varied by changing compres­sor motor speed. The inverter changes compressor
motor speed by changing AC 220 – 240V pow er to
DC once, and controls capacity by changing supply
power status to the compressor with transistor
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 compressor
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 e xchange inverter
output voltage and supply power winding.

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

The range of supply power frequency to the com­pressor differs according to the operation status.

– 14 –

0

Set
temp.

+0.5

+1

+1.5

+2

+2.5

+3

(Set temp.) 25˚C

˚C

M+
*1
*1
*1
L–

(Room temp.) – (Set temp.)

Set
temp.

+3

M+
*1
*1
*1

L–

+2.5
+2
+1.5
+1
+0.5
0

–0.5

˚C

(Room temp.) – (Set temp.)

In normal
operation

8-2. Description of Operation Circuit

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

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

• When pushing [START/STOP] button of the remote
controller, receive sound is issued from the main
unit.

8-2-1. Fan Only Operation

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

• Once the setting is made, the operation mode is
memorized in the microcomputer so that the same
operation can be effected thereafter simply b y
pushing [START/ST OP] button.

• When the FAN button is set to the AUTO position,
the indoor fan motor operates as shown in Fig.
8-2-1. When the FAN SPEED button is set
manually, the motor operates with a constant air
flow.

• ECO mode cannot be set.

NOTE :

*

1: Calculated from difference in motor speed of M+

and L–, and controlled.

Fig. 8-2-1 Auto setting of air flow

8-2-2. 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 b y
pushing [START/ST OP] b utton.

• A cooling operation signal is transmitted to outdoor
unit.

• The indoor fan motor operates as shown in Fig.8-2­2 when FAN button is set to AUTO.

• The motor operates with a constant air flow when
the F AN button is set manually .

• The outdoor unit controls the outdoor fan and the
compressor motor speed according to the opera­tion command signal sent from the indoor unit.

NOTE :

*

1: Calculated from difference in motor speed of M+

and L–, and controlled.

Fig. 8-2-2 Setting of air flow [Air Flow AUTO]

(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, compressor motor speed goes up
with restricting the maximum speed gradually
from operation start.

• When room temperature is lower than set
temperature, indoor fan motor is operated at
fan speed L– as shown in Fig. 8-2-2 while the
outdoor unit stops.

– 15 –

–0.5

0

+0.5

+1.0

+1.5

+2.0

+2.5

*1

L–

UL

(Room temp.) – (Set temp.)

Set
temp.

0

–0.5
–1
–1.5
–2

–5.0
–5.5

(Room temp.) –

(Set temp.)

Set
temp.

[FAN AUTO]

*

2

*

1

LOW

M+

HIGH

(2) Prevent-freezing control

If temperature of indoor heat exchanger detected
by the indoor heat e xchanger sensor is 4°C or
lower, compressor motor speed is gradually
lowered to pre vent freezing of the indoor heat
exchanger. If temperature is 6°C or higher, return
the operation to the above item (1).

(3) 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 15°C or lower, the maximum compres­sor motor speed is limited by the indoor fa n
speed.

8-2-3. 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 b y
pushing [START/ST OP] button.

• Dry operation signal is transmitted to outdoor unit.

• The Cooling operation giving priority to dehumidify-

ing, which restrains the indoor fan speed and
compressor motor speed, is performed.

• The indoor fan motor operates as shown in Fig. 8­2-3. (Fan speed is AUTO only.)

• The outdoor unit controls the outdoor fan relay and
the compressor motor speed according to the
operation command signal sent from the indoor
unit.

NOTE :

*

1 : Middle motor speed betw een L – and UL

Fig. 8-2-3 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.

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 UL
as shown in Fig. 8-2-3 while the outdoor unit stops.

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

8-2-4. Heating Operation

(Heat pump model only)

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.
8-2-4, and operates with a set air flow when selecting
“Low” to “High”.

However, to prev ent cold draft, revolution speed of
the fan is restricted by indoor heat exchanger tem­perature when air flow is A UTO (Fig. 8-2-5) and
starting of FAN Manual.

[Basic control]

NOTE :

*

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

linear according to temperature.

Fig. 8-2-4 Setting of air flow

– 16 –

33

*

3

*

2

32

44
43

20
19

31
30

A

A – 8

A + 4
A – 8

HIGH

TC

(˚C)

SUL

SUL

FAN

AUTO

Starting
of FAN
Manual

Approximate
revolution speed
of HIGH and SUL
linear by Tc.

Stop

( NOTE : *1)

[Cold draft preventing control]

The upper limit of fan re volution speed is shown
below.

NOTES :

*

1 Stops for 2 minutes after thermostat-OFF.

*

224°C when the set temp. is 24°C or more

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

*

3 SUL : Super ultra low

Fig. 8-2-5 Cold draft preventing control

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 for 4-w ay 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 varia-
tion 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
58°C or higher , compressor motor speed is
gradually lowered to prevent over-temp. rising of
compressed pressure.

If temperature becomes below 51°C, return to
above item (1).

(3) Defrost control

1) Detection of frost
In heating operation, time duration while the

compressor operates is counted, and defrost
operation starts by any condition described
below .

a. The counted time is 28 minutes or more,

and status that temperature of the outdoor
heat exchanger detected by the outdoor
heat exchanger is –20°C or low er contin­ued for 3 minutes or more .

b. The counted time is 28 minutes or more,

and status that temperature of the outdoor
heat exchanger detected by the outdoor
heat exchanger is –8°C or low er and
temperature lowered by 2.5 °C than the
minimum value of the outdoor heat e x­changer during 10 to 15 minutes count
time continued for 3 minutes or more.

c. The counted time is 34 minutes or more,

and status that temperature of the outdoor
heat exchanger detected by the outdoor
heat exchanger is –5°C or low er and
temperature lowered by 3.0 °C than the
minimum value of the outdoor heat e x­changer during 10 to 15 minutes count
time continued for 3 minutes or more.

d. The counted time is 4 hours or more, and

status that temperature of the outdoor heat
exchanger detected b y the outdoor heat
exchanger is 0°C or lower and temperature
lowered b y 1.0 °C than the minimum value
of the outdoor heat exchanger during 10 to
15 minutes count time continued for 3
minutes or more.

e. If the following three conditions are satis-

fied, defrost operation (Timer defrost)
starts after heating operation for 48 min­utes.



Setting on remote controller, HEAT
(mode), HIGH (Fan), 30°C (temp.).



Room temp. is 19°C to 24°C, and
outside air temp. is 5°C or lower.



Defrost operation has been already
performed once.

2) Defrost operation
Operation of the compressor is stopped once,

turn off power coupler for 4-way valve after 10
seconds, and then exchange the
4-way valv e.

After 20 seconds, restart operation of the
compressor. Turn off the outdoor fan just when
the compressor stopped.

If temperature of the indoor heat exchanger is
lower than settimg temperature, stop the
indoor fan.

– 17 –

22

Outdoor temp.
(˚C)

Cool mode

20

Fan only mode

Fan only mode (Cooling only model)

Heat mode (Heat pump model)

2˚C

1˚C

1 hour

2 hours

Operation suppression zone

Operation start

Set
temperature

Room
temperature

2˚C

1˚C

Set temperature

Operation
suppression zone

Room
temperature

Operation start

1 hour

2 hours

3) Defrost reset
Resetting operation from defrost to heating is

performed when any one of the following
conditions is satisfied.

a. Temperature of the outdoor heat ex-

changer rose to +8°C or higher.

b. A status that temperature of the outdoor

heat exchanger is +5°C or higher contin-

ued for 80 seconds.
c. Defrost operation continued for 10 minutes.
In resetting defrost operation, the compressor

stops for 50 seconds if defrost has started
under condition a. to d. in item 1, but the
compressor is reset to heating operation
keeping operated if defrost has started under
condition e. in item 1.

8-2-5. Auto Operation

(1) As shown in Fig. 8-2-6, the operation mode

(COOL, FAN ONLY, HEA T) is selected according
to the outside temperature when the operation
has started.

The operation in F an only mode continues until
an operation mode is selected.

If the room temperature is 20°C or higher when

“AUTO” operation started within 2 hours after
“HEAT” operation had stopped, select an oper a-

tion mode after Fan operation of ultr a low fan.
In AU TO operation, the set temperature of each

operation can be corrected by the remote con­troller in the range of 17 to 30°C.

Fig. 8-2-6

(2) After selecting the operation mode (COOL, FA N

ONLY, HEAT), select an operation mode again
when a status that the compressor was turned
off by the room temperature or outside air tem­perature continues for 15 minutes.

8-2-6. ECO Timer Operation

When you push the ECO button during cooling, Dry,
heating, or A operation, the air conditioner will start
the following operation.

The fan speed will be automatically controlled.

• Cooling operation / Dry operation

In the operation suppression zone, where capacity
is kept to the minimum, overcooling is prevented by
raising the temperature setting by 1°C after 1 hour
and by 2°C after 2 hours of operation.

The room temperature is thus regulated between
the operation suppression zone and the set tem­perature.

Fig. 8-2-7

• Heating operation
(Heat pump model only)

In the operation suppression zone, where capacity
is kept to the minimum, ov erheating is prevented by
lowering the temperature setting by 1°C after 1
hour and by 2°C after 2 hours of operation.

The room temperature is thus regulated between
the set temperature and the operation suppression
zone.

Fig. 8-2-8

8-2-7. High POWER Operation

When you push the Hi-POWER b utton during cool­ing, heating, or A operation, the air conditioner will
start the following operation. (A operation : Auto
change over)

• Cooling operation

Performs the cooling operation at 1°C lower than
the setting temperature.

When the room temperature is above the setting
temperature. In addition, fan speed is high*.

Once room temperature is within 1°C of the setting
temperature.

* Noise level raises in accordance with fan speed.

• Heating operation (Heat pump model only)

Performs the heating operation at 2°C higher than
the setting temperature.

– 18 –

220V/230V 240V

220V 230V

AB

AUTO RESTART
OFF ON

TEMPORARY
COOL AUTO

VOL TAGE1

VOL TAGE2 REMOCON

8-3. TEMPORARY Operation

• Setting the TEMPORAR Y switch to “AUTO” starts
the automatic operation, to “COOL” starts the
cooling operation (LOW), respectiv ely.

• Setting the TEMPORAR Y switch to “AUTO” or
“COOL”, the operation can’t be performed from the
remote controller. (without “STOP” button)

• Temporary Auto Operation is operated with the set
temperature fixed at 24°C.

• Temporary Cooling Operation is operated with

Indoor fan speed fixed to Low and with compressor
motor speed fixed to 28.0Hz.

*

1 If the float switch is not reset (closed) within 2 minutes 30 seconds , the operation lamp flashes. (5Hz)

*

2 When the float switch has been reset, the system recogniz es the flashing oper ation lamp and the oper ation of

the outdoor unit resumes after 2 minutes 30 seconds.

Fig. 8-4-2

Thermo OFF Thermo ON

Drain pump

ON

ON

Float switch

CLOSE

Compressor

ON OFF ON

Indoor fan

ON

Operation starts

Drain pump

ON

Float switch

OPEN

Compressor

OFF

Indoor fan

Compressor stops.
Drain pump continues operation.

Operation starts at overflowing Overflow detection durling operation

ON

Overflow detection

ON ON

CLOSE OPEN CLOSE

ON ONOFF

ON

Overflow stops

*

1 2'30"

*

2 2'30"

To stop the temporary operation,

set the switch to “AUTO RESTART OFF”.

Fig. 8-3-1

8-4. Control of Drain-up Kit (Option)

8-4-1. Dain Control

• In cooling, and dry operation, drain pump is
actuated to drain up.

[OPERATION CONTROL]

During cooling, and drying operation :
Drain pump ON.

Fig. 8-4-1

8-4-2. Over Flow Check Control

• Drain level is checked by float switch. If the float switch is actuated (OPEN), stop operation of the outdoor unit
and operate the drain pump exert to drain out.

• In fan only, heating operation (Heat pump model only), and even in stoppage but while float switch is actuated,
drain pump is ON (Operation).

[OVERFLOW CHECK AND CONTROL]

– 19 –

220V/230V 240V

220V 230V

AB

AUT O RESTART
OFF ON

TEMPORARY
COOL AUT O

VOLTA GE1

VOLTA GE2 REMOCON

AUT O RESTART
OFF ON

TEMPORARY
COOL AUT O

AUT O RESTART
OFF ON

TEMPORARY
COOL AUT O

OPERATION

Slide the slide switch to AUTO RESTART ON side.

MOTION

When you set to “ON” position of Auto restart, Pi Pi Pi
sound (3 times) are appear.
(During power supply to the unit)

When power supplying return, system will be restart
automatically.

OPERATION

Slide the slide switch to AUTO RESTART OFF side.

MOTION

When you set to “OFF” position of Auto restart, Pi Pi Pi
sound (3 times) are appear.
(During power supply to the unit)

When power supplying return, system will not be
restart automatically.

8-5. Auto Restart Function

This unit is equipped with an Automatic restarting function which allows the unit to restart and resume the set
operating conditions in the ev ent of a supply power shutdown without the use of the remote controller.

The operation will resume without warning three minutes after the power is restored.

INFORMATION

The AUTO RESTART FUNCTION is not set to work on shipment from the factory, and so it is necessary to
set it to function as required.

CAUTION

When wired remote controller is connected and in case of its
batteries are exhausted or not used, the unit restart FAN ONLY
operation.

• The Auto Restart function will not accept an instruction if timer operation with the remote controller is selected.
(Please refer to the section of setting the timer operation.)

HOW T O CANCEL THE AUTO RESTART

To cancel the AU TO RESTART function, proceed as follows:
The system will now be required to manually restart with the remote controller after the main supply is returned.

HOW T O SET THE AUTO REST ART

To set the auto restart function, proceed as follows: