Mitsubishi SEZ-KD71VAQ.TH, SEZ-KD35VAQ.TH, SEZ-KD25VA(L), SEZ-KD60VA(L), SEZ-KD71VA(L) Service Manual

TECHNICAL & SERVICE MANUAL

CONTENTS

1. PART NAMES AND FUNCTIONS ········2

2. SPECIFICATIONS·································4

3. OUTLINES AND DIMENSIONS··········17

4. WIRING DIAGRAM ·····························18

5.

REFRIGERANT SYSTEM DIAGRAM

·······19

6. TROUBLESHOOTING·························20

7. DISASSEMBLY PROCEDURE···········32

INDOOR UNIT

Indoor unit
[Model names] [Service Ref.]

SEZ-KD25VAQ SEZ-KD25VAQ.TH
SEZ-KD35VAQ SEZ-KD35VAQ.TH
SEZ-KD50VAQ SEZ-KD50VAQ.TH
SEZ-KD60VAQ SEZ-KD60VAQ.TH
SEZ-KD71VAQ SEZ-KD71VAQ.TH

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

WIRED REMOTE

CONTROLLER

(option)

ON/OFF

TEMP.

Model name
indication

No.HWE10080

REVISED EDITION-B

December 2010

2

1

PART NAMES AND FUNCTIONS

Indoor Unit

Air outlet duct flange

Air outlet

Air inlet

● Operation buttons

Once the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.

Wired remote controller (option)

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

MENU

BACK DAY

MONITOR/SET

CLOCK

ON/OFF

Set Temperature buttons

Down

Up

Timer Menu button
(Monitor/Set button)

Mode button (Return button)

Set Time buttons

Back

Ahead

Timer On/Off button
(Set Day button)

Opening the
door

Start/Stop button

Fan Speed button

Filter button
(<return sign> button)

Test Run button

Service button (Clear button)

Airflow Up/Down button

Louver button
(

Operation button)

To preceding operation
number

Ventilation button
(

Operation button)

To next operation number

3

● Display

For purposes of this explanation,
all parts of the display are shown
as lit. During actual operation, only
the relevant items will be lit.

˚F˚C

˚F˚C

ERROR CODE

AFTER

TIMER

TIME SUN MON TUE WED THU FRI SAT

ON
OFF

Hr
AFTER

FILTER

FUNCTION

ONLY1Hr.

WEEKLY

SIMPLE

AUTO OFF

Identifies the current operation

Shows the operating mode, etc.
* Multilanguage display is sup-

ported.

“Centrally Controlled” indicator

Indicates that operation of the re­mote controller has been prohib­ited by a master controller.

“Timer Is Off” indicator

Indicates that the timer is off.

Temperature Setting

Shows the target temperature.

Day-of-Week

Shows the current day of the week.

Time/Timer Display

Shows the current time, unless the simple or Auto Off
timer is set.
If the simple or Auto Off timer is set, shows the time
remaining.

“Sensor” indication

Displayed when the remote controller
sensor is used.

“Locked” indicator

Indicates that remote controller but­tons have been locked.

“Clean The Filter” indicator

Comes on when it is time to clean the
filter.

Timer indicators

The indicator comes on if the corre­sponding timer is set.

Up/Down Air Direction indica­tor

The indicator shows the direc­tion of the outcoming airflow.

“One Hour Only” indicator

Displayed if the airflow is set to
Low and downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off after one
hour, at which time the airflow di­rection also changes.

Room Temperature display

Shows the room temperature.

Louver display

Indicates the action of the swing
louver. Does not appear if the
louver is stationary.

(Power On indicator)

Indicates that the power is on.

Fan Speed indicator

Shows the selected fan speed.

Ventilation indicator

Appears when the unit is running in
Ventilation mode.

Caution

● Only the Power on indicator lights when the unit is stopped and power supplied to the unit.

● If you press a button for a feature that is not installed in the indoor unit, the remote controller will display the “Not Available”

message.
If you are using the remote controller to operate multiple indoor units, this message will appear only if the feature is not
present at the parent unit.

● When power is turned ON for the first time, it is normal that “PLEASE WAIT” is displayed on the room temperature indication
(For max. 2minutes). Please wait until this “PLEASE WAIT” indication disappears then start the operation.

4

2

SPECIFICATIONS

kW

kW
A

˚C(˚F)

Fan

Pa

kW

m3/min

mm
In.
kg
mm(in.)
A

Liquid

mm(in.)

Gas

mm(in.)
mm(in.)

dB<A>

Net weight

R410A

Motor output

Airflow rate(Low-Mid-High)

Motor type

External finish

Wiring

Capacity

Model Name

Power source

Optional parts
Remark

Document

Standard
attachment

Power input
Current

Type x Quantity

Airflow direction

Temperature set range Remote controller

Varistor

External static press

Driving mechanism

External dimension

Drain piping diameter

H x W x D

<Cooling> Indoor: 27˚CD.B./19˚CW.B. (81˚FD.B. / 66˚FW.B. Outdoor:35˚CD.B. (95˚FD.B. )

Insulation material
Air filter

Connectable outdoor unit

Refrigerant control device

Protection devices

Note

Pipe length: 7.5m (24-9/16ft) Height difference: 0m (0ft)

2.The external static pressure is set to 15 Pa at factory shipment.

<Heating> Indoor:20

˚CD.B. (68˚FD.B.) Outdoor:7˚CD.B. / 6˚CW.B. (45˚FD.B. / 43˚FW.B.)

1.Cooling/Heating capacity indicates the maximum value at operation under the following condition.

Refrigerant
piping diameter

R410A

Noise level (Low-Mid-High)
(measured in anechoic room)

Heat exchanger

Terminal block
Power outlet A

Accessory *3

Min.size of wire
Amperage of wire breaker

Cooling

2.5

0.04

0.39

19 to 30 (67 to 86)

Heating

3.0

0.04

0.39

17 to 28 (63 to 83)

230V (50Hz)

-

Sirocco fan x 2

5-15-35-50

DC blushless motor

0.096

Direct-driven

5.5-7.0-9.0
Galvanized

200 x 700 x 700

7-7/8 x 27-9/16 x 27-9/16

18

1.6 (1/8)
15

ø6.35 (ø1/4) Flare
ø9.52 (ø3/8) Flare

O.D. 32 (1-9/32)

23-26-30

Polystyrene foam, Polyethylene foam, Urethane foam

PP Honeycomb fabric (washable)

-

R410A SUZ-KA25VA(H)

Fuse (250V 6.3A)

Cross fin (Aluminum fin and copper tube)

ERZV10D471

To outdoor unit : 3P To wired remote controller : 2P

10

Installation Manual, Instruction Book

Drain hose (flexible joint), Remote Controller

Drain Iift-up mechanism (PAC-KE07DM-E)

SEZ-KD25VAQ

Cooling

3.5

0.05

0.46

19 to 30 (67 to 86)

Heating

4.0

0.05

0.46

17 to 28 (63 to 83)

230V (50Hz)

-

Sirocco fan x 2

5-15-35-50

DC blushless motor

0.096

Direct-driven

7.0-9.0-11.0
Galvanized

200 x 900 x 700

7-7/8 x 35-7/16 x 27-9/16

21

1.6 (1/8)
15

ø6.35 (ø1/4) Flare
ø9.52 (ø3/8) Flare

O.D. 32 (1-9/32)

23-28-33

Polystyrene foam, Polyethylene foam, Urethane foam

PP Honeycomb fabric (washable)

-

R410A SUZ-KA35VA(H)

Fuse (250V 6.3A)

Cross fin (Aluminum fin and copper tube)

ERZV10D471

To outdoor unit : 3P To wired remote controller : 2P

10

Installation Manual, Instruction Book

Drain hose (flexible joint), Remote Controller

Drain Iift-up mechanism (PAC-KE07DM-E)

SEZ-KD35VAQ

5

kW

kW
A

˚C(˚F)

Fan

Pa

kW

m3/min

mm
In.
kg
mm(in.)
A

Liquid

mm(in.)

Gas

mm(in.)
mm(in.)

dB<A>

Net weight

R410A

Motor output

Airflow rate(Low-Mid-High)

Motor type

External finish

Wiring

Capacity

Model Name

Power source

Optional parts
Remark

Document

Standard
attachment

Power input
Current

Type x Quantity

Airflow direction

Temperature set range Remote controller

Varistor

External static press

Driving mechanism

External dimension

Drain piping diameter

H x W x D

<Cooling> Indoor: 27˚CD.B./19˚CW.B. (81˚FD.B. / 66˚FW.B. Outdoor:35˚CD.B. (95˚FD.B. )

Insulation material
Air filter

Connectable outdoor unit

Refrigerant control device

Protection devices

Note

Pipe length: 7.5m (24-9/16ft) Height difference: 0m (0ft)

2.The external static pressure is set to 15 Pa at factory shipment.

<Heating> Indoor:20

˚CD.B. (68˚FD.B.) Outdoor:7˚CD.B. / 6˚CW.B. (45˚FD.B. / 43˚FW.B.)

1.Cooling/Heating capacity indicates the maximum value at operation under the following condition.

Refrigerant
piping diameter

R410A

Noise level (Low-Mid-High)
(measured in anechoic room)

Heat exchanger

Terminal block
Power outlet A

Accessory *3

Min.size of wire
Amperage of wire breaker

Cooling

5.0

0.07

0.63

19 to 30 (67 to 86)

Heating

6.0

0.07

0.63

17 to 28 (63 to 83)

230V (50Hz)

-

Sirocco fan x 3

5-15-35-50

DC blushless motor

0.096

Direct-driven

10.0-12.5-15.0
Galvanized

200 x 900 x 700

7-7/8 x 35-7/16 x 27-9/16

23

1.6 (1/8)
15

ø6.35 (ø1/4) Flare
ø12.7 (ø1/2) Flare

O.D. 32 (1-9/32)

30-34-37

Polystyrene foam, Polyethylene foam, Urethane foam

PP Honeycomb fabric (washable)

-

R410A SUZ-KA50VA

Fuse (250V 6.3A)

Cross fin (Aluminum fin and copper tube)

ERZV10D471

To outdoor unit : 3P To wired remote controller : 2P

20

Installation Manual, Instruction Book

Drain hose (flexible joint), Remote Controller

Drain Iift-up mechanism (PAC-KE07DM-E)

SEZ-KD50VAQ

Cooling

5.5

0.07

0.63

19 to 30 (67 to 86)

Heating

7.0

0.07

0.63

17 to 28 (63 to 83)

230V (50Hz)

-

Sirocco fan x 4

5-15-35-50

DC blushless motor

0.096

Direct-driven

12.0-15.0-18.0
Galvanized

200 x 1100 x 700

7-7/8 x 43-5/16 x 27-9/16

27

1.6 (1/8)
15

ø6.35 (ø1/4) Flare

ø15.88 (ø5/8) Flare

O.D. 32 (1-9/32)

30-34-38

Polystyrene foam, Polyethylene foam, Urethane foam

PP Honeycomb fabric (washable)

-

R410A SUZ-KA60VA

Fuse (250V 6.3A)

Cross fin (Aluminum fin and copper tube)

ERZV10D471

To outdoor unit : 3P To wired remote controller : 2P

20

Installation Manual, Instruction Book

Drain hose (flexible joint), Remote Controller

Drain Iift-up mechanism (PAC-KE07DM-E)

SEZ-KD60VAQ

6

kW

kW
A

˚C(˚F)

Fan

Pa

kW

m3/min

mm
In.
kg
mm(in.)
A

Liquid

mm(in.)

Gas

mm(in.)
mm(in.)

dB<A>

Net weight

R410A

Motor output

Airflow rate(Low-Mid-High)

Motor type

External finish

Wiring

Capacity

Model Name

Power source

Optional parts
Remark

Document

Standard
attachment

Power input
Current

Type x Quantity

Airflow direction

Temperature set range Remote controller

Varistor

External static press

Driving mechanism

External dimension

Drain piping diameter

H x W x D

<Cooling> Indoor: 27˚CD.B./19˚CW.B. (81˚FD.B. / 66˚FW.B. Outdoor:35˚CD.B. (95˚FD.B. )

Insulation material
Air filter

Connectable outdoor unit

Refrigerant control device

Protection devices

Note

Pipe length: 7.5m (24-9/16ft) Height difference: 0m (0ft)

2.The external static pressure is set to 15 Pa at factory shipment.

<Heating> Indoor:20

˚CD.B. (68˚FD.B.) Outdoor:7˚CD.B. / 6˚CW.B. (45˚FD.B. / 43˚FW.B.)

1.Cooling/Heating capacity indicates the maximum value at operation under the following condition.

Refrigerant
piping diameter

R410A

Noise level (Low-Mid-High)
(measured in anechoic room)

Heat exchanger

Terminal block
Power outlet A

Accessory *3

Min.size of wire
Amperage of wire breaker

Cooling

7.1

0.10

0.84

19 to 30 (67 to 86)

Heating

8.1

0.10

0.84

17 to 28 (63 to 83)

230V (50Hz)

-

Sirocco fan x 4

5-15-35-50

DC blushless motor

0.096

Direct-driven

12.0-16.0-20.0
Galvanized

200 x 1100 x 700

7-7/8 x 43-5/16 x 27-9/16

27

1.6 (1/8)
15

ø9.52 (ø3/8) Flare

ø15.88 (ø5/8) Flare

O.D. 32 (1-9/32)

30-35-40

Polystyrene foam, Polyethylene foam, Urethane foam

PP Honeycomb fabric (washable)

-

R410A SUZ-KA71VA

Fuse (250V 6.3A)

Cross fin (Aluminum fin and copper tube)

ERZV10D471

To outdoor unit : 3P To wired remote controller : 2P

20

Installation Manual, Instruction Book

Drain hose (flexible joint), Remote Controller

Drain Iift-up mechanism (PAC-KE07DM-E)

SEZ-KD71VAQ

7

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD25VAQ.TH

External static pressure: 15Pa

High

Middle

30

SPL(dB)

26

Low

23

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD25VAQ.TH

External static pressure: 5Pa

High

Middle

29

SPL(dB)

25

Low

22

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD25VAQ.TH

External static pressure: 50Pa

High

Middle

33

SPL(dB)

29

Low

25

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD25VAQ.TH

External static pressure: 35Pa

High

Middle

31

SPL(dB)

28

Low

24

LINE

<50/60Hz>

NOTCH

NOISE CRITERION CURVES

NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops.The sound

may be bigger than displayed level under actual installation condition by surrounding echoes. The sound level
can be higher by about 2 dB than the displayed level during cooling and heating operation.

8

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD35VAQ.TH

External static pressure: 15Pa

High

Middle

33

SPL(dB)

28

Low

23

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD35VAQ.TH

External static pressure: 5Pa

High

Middle

33

SPL(dB)

28

Low

23

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD35VAQ.TH

External static pressure: 50Pa

High

Middle

35

SPL(dB)

31

Low

25

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD35VAQ.TH

External static pressure: 35Pa

High

Middle

34

SPL(dB)

29

Low

24

LINE

<50/60Hz>

NOTCH

NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound

may be bigger than displayed level under actual installation condition by surrounding echoes. The sound level
can be higher by about 2 dB than the displayed level during cooling and heating operation.

9

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD50VAQ.TH

External static pressure: 15Pa

High

Middle

37

SPL(dB)

34

Low

30

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD50VAQ.TH

External static pressure: 5Pa

High

Middle

36

SPL(dB)

33

Low

29

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD50VAQ.TH

External static pressure: 50Pa

High

Middle

39

SPL(dB)

36

Low

32

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD50VAQ.TH

External static pressure: 35Pa

High

Middle

38

SPL(dB)

35

Low

31

LINE

<50/60Hz>

NOTCH

NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound

may be bigger than displayed level under actual installation condition by surrounding echoes. The sound level
can be higher by about 2 dB than the displayed level during cooling and heating operation.

10

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD60VAQ.TH

External static pressure: 15Pa

High

Middle

38

SPL(dB)

34

Low

30

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD60VAQ.TH

External static pressure: 5Pa

High

Middle

37

SPL(dB)

33

Low

29

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD60VAQ.TH

External static pressure: 50Pa

High

Middle

39

SPL(dB)

36

Low

32

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD60VAQ.TH

External static pressure: 35Pa

High

Middle

39

SPL(dB)

35

Low

31

LINE

<50/60Hz>

NOTCH

NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound

may be bigger than displayed level under actual installation condition by surrounding echoes. The sound level
can be higher by about 2 dB than the displayed level during cooling and heating operation.

11

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD71VAQ.TH

External static pressure: 15Pa

High

Middle

40

SPL(dB)

35

Low

30

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD71VAQ.TH

External static pressure: 5Pa

High

Middle

39

SPL(dB)

34

Low

29

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD71VAQ.TH

External static pressure: 50Pa

High

Middle

42

SPL(dB)

37

Low

32

LINE

<50/60Hz>

NOTCH

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

SEZ-KD71VAQ.TH

External static pressure: 35Pa

High

Middle

41

SPL(dB)

36

Low

31

LINE

<50/60Hz>

NOTCH

NOTE: The sound level is measured in an anechoic room where

echoes are few, when compressor stops. The sound may be
bigger than displayed level under actual installation condi­tion by surrounding echoes.The sound level can be higher
by about 2 dB than the displayed level during cooling and
heating operation.

Measurement location

2m

1m

Aux. duct

1.5m

test unit

12

INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW

SEZ-KD25VAQ

(External static pressure 15Pa) 220-240V 50/60Hz

External static pressure (Pa)

0

10

20

30

40

50

Airflow rate(m

3

/min)

4 5678910

Middle

Low

High

Limit

Rated point

0

40

30

20

10

45678910

Airflow rate(m

3

/min)

External static pressure (Pa)

SEZ-KD25VAQ

(External static pressure 5Pa) 220-240V 50/60Hz

Middle

Low

High

Rated point

Limit

0

10

20

30

40

50

60

70

80

45678910

Airflow rate(m

3

/min)

External static pressure (Pa)

SEZ-KD25VAQ

(External static pressure 50Pa) 220-240V 50/60Hz

Middle

Low

High

Limit

Rated point

0

10

20

30

40

50

60

70

80

45678910

Airflow rate(m

3

/min)

External static pressure (Pa)

SEZ-KD25VAQ

(External static pressure 35Pa) 220-240V 50/60Hz

Middle

Low

High

Limit

Rated point

13

External static pressure (Pa)

SEZ-KD35VAQ

(External static pressure 15Pa) 220-240V 50/60Hz

Airflow rate(m

3

/min)

0

10

20

30

40

50

6789101112

Middle

Low

High

Limit

Rated point

0

40

30

20

10

External static pressure (Pa)

6789101112

Airflow rate(m

3

/min)

SEZ-KD35VAQ

(External static pressure 5Pa) 220-240V 50/60Hz

Middle

Low

High

Limit

Rated point

0

20

10

30

40

50

60

70

80

External static pressure (Pa)

Airflow rate(m

3

/min)

SEZ-KD35VAQ

(External static pressure 50Pa) 220-240V 50/60Hz

6789101112

Middle

Low

High

Limit

Rated point

0

20

10

30

40

50

60

70

80

External static pressure (Pa)

SEZ-KD35VAQ

(External static pressure 35Pa) 220-240V 50/60Hz

6789101112

Airflow rate(m

3

/min)

Middle

Low

High

Limit

Rated point

14

External static pressure (Pa)

SEZ-KD50VAQ

(External static pressure 15Pa) 220-240V 50/60Hz

Airflow rate(m

3

/min)

891011 12 13 14 15 16

0

50

40

30

20

10

High

Limit

Rated point

Middle

Low

External static pressure (Pa)

SEZ-KD50VAQ

(External static pressure 5Pa) 220-240V 50/60Hz

Airflow rate(m

3

/min)

0

40

30

20

10

891011 12 13 14 15 16

Middle

Low

High

Limit

Rated point

External static pressure (Pa)

SEZ-KD50VAQ

(External static pressure 50Pa) 220-240V 50/60Hz

Airflow rate(m

3

/min)

891011 12 13 14 15 16

0

10

20

30

40

50

60

70

80

Middle

Low

High

Limit

Rated point

External static pressure (Pa)

SEZ-KD50VAQ

(External static pressure 35Pa) 220-240V 50/60Hz

Airflow rate(m

3

/min)

891011 12 13 14 15 16

0

10

20

30

40

50

60

70

80

Middle

Low

High

Limit

Rated point

15

External static pressure (Pa)

SEZ-KD60VAQ

(External static pressure 15Pa) 220-240V 50/60Hz

Airflow rate(m

3

/min)

910111213141516171819

0

50

40

30

20

10

Middle

Low

High

Limit

Rated point

External static pressure (Pa)

SEZ-KD60VAQ

(External static pressure 5Pa) 220-240V 50/60Hz

Airflow rate(m

3

/min)

910111213141516171819

0

40

30

20

10

Middle

Low

High

Limit

Rated point

External static pressure (Pa)

SEZ-KD60VAQ

(External static pressure 50Pa) 220-240V 50/60Hz

Airflow rate(m

3

/min)

910111213141516171819

0

10

20

30

40

60

70

50

80

Middle

Limit

Rated point

Low

High

External static pressure (Pa)

SEZ-KD60VAQ

(External static pressure 35Pa) 220-240V 50/60Hz

Airflow rate(m

3

/min)

910111213141516171819

0

10

20

30

40

60

70

50

80

Middle

Limit

Rated point

Low

High

16

External static pressure (Pa)

SEZ-KD71VAQ

(External static pressure 15Pa) 220-240V 50/60Hz

Airflow rate(m

3

/min)

0

50

40

30

20

10

11 12 13 14 15 16 17 18 19 20 21

Middle

High

Low

Limit

Rated point

External static pressure (Pa)

SEZ-KD71VAQ

(External static pressure 5Pa) 220-240V 50/60Hz

Airflow rate(m

3

/min)

0

40

30

20

10

11 12 13 14 15 16 17 18 19 20 21

Middle

Low

High

Limit

Rated point

External static pressure (Pa)

SEZ-KD71VAQ

(External static pressure 50Pa) 220-240V 50/60Hz

Airflow rate(m

3

/min)

2120191817161514131211

0

10

20

30

40

50

80

70

60

Middle

Low

High

Limit

Rated point

External static pressure (Pa)

SEZ-KD71VAQ

(External static pressure 35Pa) 220-240V 50/60Hz

Airflow rate(m

3

/min)

0

10

20

30

40

50

80

70

60

2120191817161514131211

Middle

Low

High

Limit

Rated point

17

OUTLINES AND DIMENSIONS

3

Unit : mm

24

20

16

900

700

500

9

7

5

1060

860

660

LJHK

{12.7

SEZ-KD71VAQ

SEZ-KD60VAQ

SEZ-KD50VAQ

SEZ-KD35VAQ

700 752 798 660 7 600 800

{15.88

{9.52

{6.35

{9.52

1198

998

AModel

SEZ-KD25VAQ

1152

952

B

1100

900

C

1060

860

D

11

9

E

1000

800

F

1200

1000

G

Air
outlet

Air
inlet

Terminal block
(Remote controller transmission line)

Drain pipe(O.D.{32)(Spontaneous draining)

1

Gas pipe

1

Liquid pipe

2

Refrigerant piping
flare connection (gas)

2

Refrigerant piping
flare connection (liquid)

Terminal block
(Indoor/outdoor connecting line)

Suspension bolt hole
4-14X30 Slot

Air filter

Control box

2XE-{2.9

2X2-{2.9

L-{2.9

Knockout hole {27
(Indoor/outdoor connecting line)

Knockout hole {27
(Remote controller transmission line)

10

170

57

More than 300

450

G

50

50~150

50

777

450

15

20

100

100X(E-1)=F

30

D (Duct)

625

(Suspension bolt pitch)

90

A

23

B (Suspension bolt pitch)

C

23 677

700

25100

23

150

(Duct)

116 70

270

102

More than 10mm

More than 20mm

25

49

10

88

100

100XJ=K 8812

12

37

100

20 157.5

20 H

200

37

Access door

Note2

Note1.Use M10 screw for the suspension bolt (field supply).

2.Keep the service space for the maintenance at the bottom.

3.This chart indicates for SEZ-KD50VAQ model,which has 3 fans.
SEZ-KD25,35VAQ models have 2 fans.
SEZ-KD60,71VAQ models have 4 fans.

4.In case an inlet duct is used,remove the air filter(supply with
the unit), then install the filter(field supply) at suction side.

Make the access door at the appointed position properly
for service maintenance.

Ceiling surface

Access door

Required space for service and maintenance

18

4

WIRING DIAGRAM

L1:ONLY
SEZ-KD71VAQ

INSIDE SECTION OF CONTROL BOX

CN22(BLUE)

LED1

CN3C(BLUE)

CNMF

SW2SW1

CN32

CN20(RED)CN44CN4F

CN41

SWE

ON

OFF

CN51

FS TH2 TH5 TH1

TB15

CN4F

CN2L

LED3

LED2

I.B.

S1

TB4

S3

S2

TO
OUTDOOR
UNIT

FAN MOTOR

ARRESTER

CONNECTOR (EMERGENCY OPERATION)

INTAKE AIR TEMP. THERMISTOR

PIPE TEMP. THERMISTOR/LIQUID

COND. /EVA. TEMP. THERMISTOR

AC REACTOR (POWER FACTOR IMPROVEMENT)

FLOAT SWITCH

SWE

TH1

TH2

TH5

L1

FS

POWER SUPPLY (I.B.)

TRANSMISSION (INDOOR-OUTDOOR)

LED2

LED3

SWITCH (FOR MODE SELECTION)

SWITCH (FOR CAPACITY CODE)

TERMINAL BLOCK
(REMOTE CONTROLLER TRANSMISSION LINE)

TERMINAL BLOCK
(REMOTE CONTROLLER TRANSMISSION LINE)

TB15

CONNECTOR (REMOTE SWITCH)

CONNECTOR (LOSSNAY)

R.B.

I.B.

CN32

REMOTE CONTROLLER BOARD

INDOOR CONTROLLER BOARD

SW2

SW1

TB4

TERMINAL BLOCK
(INDOOR/OUTDOOR CONNECTING LINE)

SYMBOL EXPLANATION

CN2L

CONNECTOR (HA TERMINAL-A)

CN51

LED1

CN41

CONNECTOR (CENTRALLY CONTROL)

POWER SUPPLY (I.B.)

DSA

FUSE AC250V 6.3A

FUSE

TB6

X1

AUX. RELAY

VARISTOR

ZNR01,02

MS

3~

135

31

1456734

12

4231

1324

12

3

TB6

R.B.

1
2

X1

DC310~340V

RECTIFY CIRCUIT

U

U

FUSE

ZNR01

(BLACK)

CN01

CNP

ZNR02

(BLUE)

DSA

1

t˚ t˚t˚

1

2

L1

DRAINPUMP

1~

M

NAMESYMBOL SYMBOL NAME

NOTE)1. Since the outdoor side electric wiring may change be sure to

check the outdoor unit electric wiring for servicing.

2. Indoor and outdoor connecting wires are made with polarities, make
wiring matching terminal numbers(S1,S2,S3).

3. Symbols used in wiring diagram above are,

:CONNECTOR
:TERMINAL
(HEAVY DOTTED LINE):FIELD WIRING
(THIN DOTTED LINE)

:OPTIONAL PARTS

19

REFRIGERANT SYSTEM DIAGRAM

5

Pipe temperature
thermistor/liquid
(TH2)

Distributor

Condenser/evaporator
temperature thermistor
(TH5)

Room temperature
thermistor (TH1)

Refrigerant flow in cooling
Refrigerant flow in heating

Strainer
#50

Strainer
#50

Heat exchanger

Refrigerant GAS pipe connection
(Flare)

Refrigerant LIQUID pipe connection
(Flare)

20

6

TROUBLESHOOTING

6-1. CAUTIONS ON TROUBLESHOOTING

(1) Before troubleshooting, check the followings:

1 Check the power supply voltage.
2 Check the indoor/outdoor connecting wire for mis-wiring.

(2) Take care the followings during servicing.

1 Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn

off the breaker.

2 When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the

components.

3 When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Lead wires

˚C

˚C

SIMPLE

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

MENU

BACK DAY

MONITOR/SET

CLOCK

ON/OFF

B

C

A

E D

6-2. SELF-CHECK FUNCTION

Wired remote controller

(1) Turn on the power.
(2) Press the [CHECK] button twice.
(3) Set refrigerant address with [TEMP] button

if system control is used.

(4) Press the [ON/OFF] button to stop the

self-check.

AA

CHECK button

BB

Refrigerant address

CC

TEMP button

DD

IC : Indoor unit

OC : Outdoor unit

EE

Check code

1 Check code Symptom Remark
P1 Intake sensor error
P2 Pipe (TH2) sensor error
P9 Pipe (TH5) sensor error
E6,E7 Indoor/outdoor unit communication error
P4 Drain sensor error
P5 Drain pump error
P6 Freezing/Overheating protection operation
EE Communication error between indoor and outdoor units
P8 Pipe temperature error
E0, E3~E5 Remote controller transmission error
E1, E2 Remote controller control board error
Fb Indoor unit control system error (memory error, etc.)
E9 Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
UP Compressor overcurrent interruption
U3,U4 Open/short of outdoor unit thermistors
UF Compressor overcurrent interruption (When compressor locked)
U2 Abnormal high discharging temperature/49C worked/insufficient refrigerant
U1,Ud Abnormal high pressure (63H worked)/Overheating protection operation
U5 Abnormal temperature of heat sink
U8 Outdoor unit fan safeguard stop
U6 Compressor overcurrent interruption/Abnormal of power module
U7 Abnormality of super heat due to low discharge temperature
U9,UH Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit

/Current sensor error

Others Other errors (Refer to the technical manual for the outdoor unit.)

For details, check the LED display
of the outdoor controller board.
As for outdoor unit, refer to
service manual OC322.

• On wired remote controller.

1 Check code displayed in the LCD.

• For description of each check code, refer to the following table.

21

•

If the unit cannot be operated properly after the test run has been performed, refer to the following table to remove the cause.

Symptom

Cause

Wired remote controller LED 1, 2 (PCB in outdoor unit)

On the wireless remote controller with condition above, following phenomena take place.

• No signals from the remote controller are accepted.

• Operation lamp is blinking.

• The buzzer makes a short piping sound.

PLEASE WAIT

PLEASE WAIT → Error code

Display messages do not
appear even when operation
switch is turned ON (operation
lamp does not light up).

For about 2
minutes after
power-on

After about 2
minutes has
expired after
power-on

After LED 1, 2 are lighted, LED 2 is

turned off, then only LED 1 is

Only LED 1 is lighted. →

LED 1, 2 blink.

Only LED 1 is lighted.

→

LED 1 blinks twice,
LED 2 blinks once.

•For about 2 minutes after power-on,op­eration of the remote controller is not possible
due to system start-up. (Correct operation)

•Connector for the outdoor unit’s protection
device is not connected.

•Reverse or open phase wiring for the outdoor
unit’s power terminal block (L1, L2, L3)

•Incorrect wiring between indoor and outdoor
units (incorrect polarity of S1, S2, S3)

•Remote controller wire short

Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)

For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.

LED1 (power for microcomputer) Indicates whether control power is supplied. Make sure that this LED is

always lit.

LED2 (power for remote controller)

Indicates whether power is supplied to the remote controller.
This LED lights only in the case of the indoor unit which is connected to the
outdoor unit refrigerant address “0”.

LED3 (communication between indoor and
outdoor units)

Indicates state of communication between the indoor and outdoor units.
Make sure that this LED is always blinking.

lighted.

(Correct operation)

Wireless remote controller

(1) Turn on the power to the unit at least 12 hours before the test run.
(2) Press the TEST RUN button AAtwice continuously.

(Start this operation from the status of remote controller display turned off.)

and current operation mode are displayed.

(3) Press the MODE button BBto activate COOL mode, then check whether

cool air is blown out from the unit.

(4) Press the MODE button BBto activate HEAT mode, then check whether

warm air is blown out from the unit.
(5) Press the FAN button CCand check whether fan speed changes.
(6) Press the VANE button DDand check whether the auto vane operates prop-

erly.
(7) Press the ON/OFF button to stop the test run.

Note:

• Point the remote controller towards the indoor unit receiver while fol-

lowing steps (2) to (7).

• It is not possible to run the in FAN, DRY or AUTO mode.

TEST RUN

22

• If the unit cannot be operated properly after the above test run has been performed, refer to the following table to remove the cause.

On the wireless remote controller with conditions above, following phenomena takes place.

• No signals from the remote controller are accepted.

• OPE lamp is blinking.

• The buzzer makes a short ping sound.

Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)

PLEASE WAIT

PLEASE WAIT

→

Error code

Display messages do not appear
even when operation switch is
turned ON (operation lamp does
not light up).

Symptom

After LED 1, 2 are lighted, LED 2 is turned
off, then only LED 1 is lighted. (Correct
operation)

Only LED 1 is lighted.

→

LED 1, 2 blink.

Only LED 1 is lighted.

→

LED 1, 2 blinks

twice, LED 2 blinks once.

• For about 2 minutes after power-on, operation of the
remote controller is not possible due to system start-up.
(Correct operation)

• Connector for the outdoor unit’s protection device is not
connected.

• Reverse or open phase wiring for the outdoor unit’s power
terminal block (L1, L2, L3)

• Incorrect wiring between indoor and outdoor units
(incorrect polarity of S1, S2, S3)

• Remote controller wire short

For about 2 minutes

following power-on

After about 2 min­utes has expired

following power-on

LED 1, 2 (PCB in outdoor unit)Wired remote controller

Cause

[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)

Wireless remote controller

Beeper sounds/OPERATION INDICATOR

lamp flashes (Number of times)

1
2
3
4
5
6
7
8
9

10

11

12
13
14

Symptom

Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
Compressor overcurrent interruption
Open/short of outdoor unit thermistors
Compressor overcurrent interruption (When compressor locked)
Abnormal high discharging temperature/49C worked/ insufficient refrigerant
Abnormal high pressure (63H worked)/ Overheating safeguard operation
Abnormal temperature of heat sink
Outdoor unit fan protection stop
Compressor overcurrent interruption/Abnormal of power module
Abnormality of super heat due to low discharge temperature
Abnormality such as overvoltage or voltage shortage and abnormal
synchronous signal to main circuit/Current sensor error
–
–
Other errors (Refer to the technical manual for the outdoor unit.)

Remark

For details, check the LED
display of the outdoor controller
board.

[Output pattern A] Errors detected by indoor unit

Wireless remote controller

Beeper sounds/OPERATION

INDICATOR lamp flashes

(Number of times)

1
2
3
4
5
6
7
8

9
10
11
12

No sound

Wired remote

controller

Check code

P1
P2, P9
E6, E7
P4
P5
P6
EE
P8
E4
–
–
Fb
– –

Symptom

Intake sensor error
Pipe (Liquid or 2-phase pipe) sensor error
Indoor/outdoor unit communication error
Drain sensor error
Drain pump error
Freezing/Overheating safeguard operation
Communication error between indoor and outdoor units
Pipe temperature error
Remote controller signal receiving error
–
–
Indoor unit control system error (memory error, etc.)
No corresponding

Remark

*1 If the beeper does not sound again after the initial two beeps to confirm the self-check start signal was received and the OPERATION INDICATOR lamp does not

come on, there are no error records.

*2 If the beeper sounds three times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 sec.)” after the initial two beeps to confirm the self-check start signal was

received, the specified refrigerant address is incorrect.

• On wireless remote controller
The continuous buzzer sounds from receiving section of indoor unit.
Blink of operation lamp

• On wired remote controller
Check code displayed on the LCD.

23

Indicates whether control power is supplied. Make sure that this LED is always lit.

Indicates whether power is supplied to the remote controller. This LED lights only in the case of

the indoor unit which is connected to the outdoor unit refrigerant address “0”.

Indicates state of communication between the indoor and outdoor units. Make sure that this LED is

always blinking.

LED 1 (power for microcomputer)

LED 2 (power for remote controller)

LED 3 (communication between indoor and outdoor units)

AUTO RESTART FUNCTION

Indoor controller board

This model is equipped with the AUTO RESTART FUNCTION.
When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are memorized by the indoor controller board.
The auto restart function sets to work the moment the power has restored after power failure, then, the unit will restart automatically.
Set the AUTO RESTART FUNCTION using the wireless remote controller. (Mode no.1).

For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.

24

6-3. SELF-DIAGNOSIS ACTION TABLE

Note: Refer to the manual of outdoor unit for the details of display

such as F, U, and other E.

Error Code

Abnormal point and detection method

Cause

Countermeasure

P1

Room temperature
thermistor (TH1)

1 The unit is in three-minute resume

prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after three
minutes. (The unit returns to normal
operation, if it has normally reset.)

2 Constantly detected during cooling,

drying and heating operation
Short: 90: or more
Open: -40: or less

1 Defective thermistor

characteristics

2 Contact failure of connector

(CN20) on the indoor controller
board (Insert failure)

3 Breaking of wire or contact

failure of thermistor wiring

4 Defective indoor controller

board

1–3 Check resistance value of thermistor.
0: ······15.0k"
10: ····9.6k"
20: ····6.3k"
30: ····4.3k"
40: ····3.0k"
If you put force on (draw or bend) the lead wire
with measuring resistance value of thermistor
breaking of wire or contact failure can be
detected.
2 Check contact failure of connector (CN20) on

the indoor controller board. Refer to 6-5.
Tu rn the power on again and check restart
after inserting connector again.

4 Check room temperature display on remote

controller.
Replace indoor controller board if there is
abnormal difference with actual room
temperature.

Tu rn the power off, and on again to operate
after check.

P2

Pipe temperature
thermistor/Liquid (TH2)

1 The unit is in three-minute resume

prevention mode if short/open of
thermistor is detected. Abnormal if the
unit does not reset normally after three
minutes. (The unit returns to normal
operation, if it has normally reset.)

2 Constantly detected during cooling,

drying, and heating (except defrosting)
operation.
Short: 90: or more
Open: -40: or less

1 Defective thermistor

characteristics

2 Contact failure of connector

(CN44) on the indoor controller
board (Insert failure)

3 Breaking of wire or contact

failure of thermistor wiring

4 Defective refrigerant circuit is

causing thermistor temperature
of 90: or more or -40: or

less.

5 Defective indoor controller board

1–3 Check resistance value of thermistor.

For characteristics, refer to (P1) above.
2 Check contact failure of connector (CN44) on

the indoor controller board. Refer to 6-5. Turn
the power on again and check restart after
inserting connector again.

4 Check pipe <liquid> temperature with remote

controller in test run mode. If pipe <liquid>
temperature is extremely low (in cooling
mode) or high (in heating mode), refrigerant
circuit may have defective.

5 Check pipe <liquid> temperature with remote

controller in test run mode. If there is extreme
difference with actual pipe <liquid> temperature,
replace indoor controller board.

Tu rn the power off, and on again to operate
after check.

P4

(5701)

Contact failure of drain float switch (CN4F)

1 Extract when the connector of drain float

switch is disconnected.
(3 and 4 of connector CN4F is not
short-circuited.)

2 Constantly detected during operation.

1 Contact failure of connector

(Insert failure)

2 Defective indoor controller

board

1 Check contact failure of float switch connec-

tor.
Tu rn the power on again and check after
inserting connector again.

2 Operate with connector (CN4F) short-circuited.

Replace indoor controller board if abnormali­ty reappears.

P5

Drain overflow protection operation

1 Suspensive abnormality, if drain float

switch is detected to be underwater for 1
minute and 30 seconds continuously
with drain pump on.
Tu rn off compressor and indoor fan.

2 Drain pump is abnormal if the condition

above is detected during suspensive
abnormality.

3 Constantly detected during drain pump

operation.

1 Malfunction of drain pump
2 Defective drain

Clogged drain pump
Clogged drain pipe

3 Defective drain float switch

Catch of drain float switch or
malfunction of moving parts
cause drain float switch to be
detected under water (Switch
On)

4 Defective indoor-controller

board

1 Check if drain-up machine works.
2 Check drain function.

3 Remove drain float switch connector CN4F

and check if it is short (Switch On) with the
moving part of float switch UP, or OPEN with
the moving part of float switch down.
Replace float switch if it is short with the
moving part of float switch down.

4 Replace indoor controller board if it is short-

circuited between 3-4 of the drain float
switch connector CN4F and abnormality
reappears.

It is not abnormal if there is no problem about
the above-mentioned 1~4

Tu rn the power off, and on again to operate
after check.

25

Error Code

Abnormal point and detection method

Cause

Countermeasure

P6

Freezing/overheating protection is
working

1 Freezing protection (Cooling mode)

The unit is in six-minute resume prevention
mode if pipe <liquid or condenser/evap­orator> temperature stays under

-15: for three minutes after the com-
pressor started. Abnormal if it stays
under -15: for three minutes again
within 16 minutes after six-minute
resume prevention mode.

2 Overheating protection (Heating mode)

The units is in six-minute resume
prevention mode if pipe <Liquid or con­denser / evaporator> temperature is
detected as over 70: after the com­pressor started. Abnormal if the temper­ature of over 70: is detected again
within 10 minutes after six-minute
resume prevention mode.

P8

1 Slight temperature difference

between indoor room
temperature and pipe <liquid
or condenser / evaporator>
temperature thermistor

• Shortage of refrigerant

• Disconnected holder of pipe
<liquid or condenser /

evaporator> thermistor

• Defective refrigerant circuit

2 Converse connection of

extension pipe (on plural units
connection)

3 Converse wiring of indoor/

outdoor unit connecting wire
(on plural units connection)

4 Defective detection of indoor

room temperature and pipe
<condenser / evaporator>
temperature thermistor

5 Stop valve is not opened

completely.

(Cooling or drying mode)

1 Clogged filter (reduced airflow)
2 Short cycle of air path
3 Low-load (low temperature)

operation beyond the tolerance
range

4 Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is
defective.

5 Defective outdoor fan control
6 Overcharge of refrigerant
7 Defective refrigerant circuit

(clogs)

(Heating mode)

1 Clogged filter (reduced airflow)
2 Short cycle of air path
3 Over-load (high temperature)

operation beyond the tolerance
range

4 Defective indoor fan motor

• Fan motor is defective.

• Indoor controller board is
defective.

5 Defective outdoor fan control
6 Overcharge of refrigerant
7 Defective refrigerant circuit

(clogs)

8 Bypass circuit of outdoor unit

is defective.

(Cooling or drying mode)

1 Check clogging of the filter.
2 Remove shields.

4 Refer to 6-7. DC Fan motor (FAN MOTOR/

INDOOR CONTROLLER BOARD)

5 Check outdoor fan motor.
67 Check operating condition of refrigerant

circuit.

(Heating mode)

1 Check clogs of the filter.
2 Remove shields.

4 Refer to 6-7. DC Fan motor (FAN MOTOR/

INDOOR CONTROLLER BOARD)

5 Check outdoor fan motor.
6~8Check operating condition of refrigerant

circuit.

Pipe temperature

<Cooling mode>
Detected as abnormal when the pipe tem­perature is not in the cooling range 3 min­utes after compressor start and 6 minutes
after the liquid or condenser/evaporator pipe
is out of cooling range.
Note 1) It takes at least 9 minutes. to

detect.

Note 2) Abnormality P8 is not detected in

drying mode.
Cooling range : -3 deg ] (TH-TH1)
TH: Lower temperature between: liquid

pipe temperature (TH2) and con­denser/evaporator temperature (TH5)

TH1: Intake temperature

<Heating mode>
When 10 seconds have passed after the
compressor starts operation and the hot
adjustment mode has finished, the unit is
detected as abnormal when
condenser/evaporator pipe temperature is
not in heating range within 20 minutes.

Note 3) It takes at least 27 minutes to

detect abnormality.
Note 4) It excludes the period of defrosting

(Detection restarts when defrost-

ing mode is over)
Heating range : 3 deg [ (TH5-TH1)

1~4 Check pipe <liquid or condenser /

evaporator> temperature with room
temperature display on remote
controller and outdoor controller circuit
board.
Pipe <liquid or condenser / evaporator>
temperature display is indicated by
setting SW2 of outdoor controller circuit
board as follows.

23Check converse connection of extension

pipe or converse wiring of indoor/outdoor
unit connecting wire.

Conduct temperature check with outdoor
controller circuit board after connecting
‘A-Control Service Tool(PAC-SK52ST)’.

(

)

26

Error Code

Abnormal point and detection method

Cause

Countermeasure

P9

Abnormality of pipe temperature ther­mistor / Condenser-Evaporator (TH5)

1 The unit is in three-minute resume pro-

tection mode if short/open of thermistor
is detected. Abnormal if the unit does
not get back to normal within three min­utes. (The unit returns to normal opera­tion, if it has normally reset.)

2 Constantly detected during cooling, dry-

ing, and heating operation (except
defrosting)
Short: 90: or more
Open: -40: or less

1 Defective thermistor

characteristics

2 Contact failure of connector

(CN44) on the indoor controller
board (Insert failure)

3 Breaking of wire or contact

failure of thermistor wiring

4 Temperature of thermistor is

90: or more or -40: or less
caused by defective refrigerant
circuit.

5 Defective indoor controller

board

1–3 Check resistance value of thermistor.

For characteristics, refer to (P1) above.

2 Check contact failure of connector (CN44)

on the indoor controller board.
Refer to 6-5.
Tu rn the power on and check restart after
inserting connector again.

4 Operate in test run mode and check pipe

<condenser / evaporator> temperature.
If pipe <condenser / evaporator> tempera­ture is extremely low (in cooling mode) or
high (in heating mode), refrigerant circuit
may have defect.

5 When no problems are found in 1-4 above,

replace the indoor unit control board.

E0

or

E4

Remote controller transmission
error(E0)/signal receiving error(E4)

1 Abnormal if main or sub remote con-

troller can not receive normally any
transmission from indoor unit of refriger­ant address “0” for three minutes.
(Error code : E0)

2 Abnormal if sub remote controller could

not receive for any signal for two min­utes. (Error code: E0)

1 Abnormal if indoor controller board can

not receive normally any data from
remote controller board or from other
indoor controller board for three minutes.
(Error code: E4)

2 Indoor controller board cannot receive

any signal from remote controller for two
minutes. (Error code: E4)

1 Check disconnection or looseness of indoor

unit or transmission wire of remote controller.

2 Set one of the remote controllers “main”.

If there is no problem with the action above.

3 Check wiring of remote controller.

•Total wiring length: max.500m
(Do not use cable ✕ 3 or more)

• The number of connecting indoor units:
max.16units

• The number of connecting remote con­troller: max.2units

When it is not the above-mentioned problem of

1~3
4 Diagnose remote controllers.

a) When “RC OK” is displayed,

Remote controllers have no problem.
Tu rn the power off, and on again to check.
If abnormality generates again, replace
indoor controller board.

b) When “RC NG” is displayed,

Replace remote controller.
c) When “RC E3” is displayed,
d) When “ERC 00-06” is displayed,
[ c),d)→Noise may be causing abnormality. ]

∗ If the unit is not normal after replacing

indoor controller board in group control,
indoor controller board of address “0”
may be abnormal.

E3

or

E5

Remote controller transmission
error(E3)/signal receiving error(E5)

1 Abnormal if remote controller could not

find blank of transmission path for six
seconds and could not transmit.

(Error code: E3)

2 Remote controller receives transmitted

data at the same time, compares the
data, and when detecting it, judges
different data to be abnormal 30
continuous times. (Error code: E3)

1 Abnormal if indoor controller board could

not find blank of transmission path.

(Error code: E5)

2 Indoor controller board receives trans-

mitted data at the same time, compares
the data,and when detecting it, judges
different data to be abnormal 30
continuous times. (Error code: E5)

1 Set a remote controller to main, and the

other to sub.

2 Remote controller is connected with only one

indoor unit.

3 The address changes to a separate setting.

4~6 Diagnose remote controller.

a) When “RC OK”is displayed, remote con-

trollers have no problem.

Tu rn the power off,and on again to check.
When becoming abnormal again, replace

indoor controller board.
b)When “RC NG”is displayed, replace

remote controller.
c)When “RC E3”or “ERC 00-66”is displayed,

noise may be causing abnormality.

1 Contact failure at transmission

wire of remote controller

2 All remote controllers are set

as “sub” remote controller. In
this case, E0 is displayed on
remote controller, and E4 is
displayed at LED (LED1, LED2)
on the outdoor controller circuit
board.

3 Mis-wiring of remote controller
4 Defective transmitting receiving

circuit of remote controller

5 Defective transmitting receiving

circuit of indoor controller board
of refrigerant address “0”

6 Noise has entered into the

transmission wire of remote
controller.

1 Tw o remote controller are set

as “main.”

(In case of 2 remote con-

trollers)

2 Remote controller is connected

with two indoor units or more.

3 Repetition of refrigerant

address

4 Defective transmitting receiving

circuit of remote controller

5 Defective transmitting receiving

circuit of indoor controller
board

6 Noise has entered into trans-

mission wire of remote con­troller.

27

E6

1 Contact failure, short circuit or,

mis-wiring (converse wiring) of
indoor/outdoor unit connecting
wire

2 Defective transmitting receiving

circuit of indoor controller board

3 Defective transmitting receiving

circuit of indoor controller board

4 Noise has entered into indoor/

outdoor unit connecting wire.

∗ Check LED display on the outdoor control cir-

cuit board. (Connect A-control service tool,
PA C-SK52ST.)
Refer to EA-EC item if LED displays EA-EC.

1 Check disconnection or looseness of indoor/

outdoor unit connecting wire of indoor unit or
outdoor unit.

Check all the units in case of twin triple
indoor unit system.

2-4 Tu rn the power off, and on again to check.

If abnormality generates again, replace
indoor controller board or outdoor
controller circuit board.

∗ Other indoor controller board may have

defect in case of twin triple indoor unit
system.

E7

Indoor/outdoor unit communication
error (Transmitting error)

Abnormal if “1” receiving is detected 30
times continuously though indoor controller
board has transmitted “0”.

1 Defective transmitting receiving

circuit of indoor controller board

2 Noise has entered into power

supply.

3 Noise has entered into outdoor

control wire.

1-3 Tu rn the power off, and on again to check.

If abnormality generates again, replace
indoor controller board.

Indoor/outdoor unit communication
error (Signal receiving error)

1 Abnormal if indoor controller board

cannot receive any signal normally for
six minutes after turning the power on.

2 Abnormal if indoor controller board

cannot receive any signal normally for
three minutes.

3 Consider the unit as abnormal under the

following condition: When two or more
indoor units are connected to an
outdoor unit, indoor controller board
cannot receive a signal for three minutes
from outdoor controller circuit board, a
signal which allows outdoor controller
circuit board to transmit signals.

Error Code

Abnormal point and detection method

Cause

Countermeasure

Fb

Indoor controller board

Abnormal if data cannot be read normally
from the nonvolatile memory of the indoor
controller board.

1 Defective indoor controller

board

1 Replace indoor controller board.

E1

or

E2

Remote controller control board

1 Abnormal if data cannot be read normal-

ly from the nonvolatile memory of the
remote controller control board.

(Error code: E1)

2 Abnormal if the clock function of remote

controller cannot be operated normally.

(Error code: E2)

1 Defective remote controller 1 Replace remote controller.

PA

(2500)

Water leakage

This detection is performed during the
operation (stop, heating, fan, or error stop
mode etc.) other than cooling and dry.
1 When a) and b) are found, water leakage

occurs.
a) Pipe <liquid> temperature - inlet tem-

perature < -10˚C for 30 minutes

b) When drain float switch is detected to

be soaked in the water for 15 minutes
or more.

* When drain float switch is detected to

be NOT soaked in the water, each
counting of a) and b) is cleared.

*When this error is detected, the error
will not be reset until the main power is
reset.

1 Mis-piping of extension pipes

(When connected with multiple
units)

2 Mis-wiring of indoor/outdoor

unit connecting wire (When
connected with multiple units)

3 Detection failure of the indoor

unit inlet/ pipe <liquid> ther­mistor

4 Drain pump failure

5 Drainage failure

· Clogged drain pump

· Clogged drain pipe

6 Drain float switch failure

· Drain float switch is detected
to be soaked in the water (ON
status) due to the operation
failure of the moving parts.

· Contact failure of drain float
switch connector
(Loose connector)

1Check the extension pipes for mis-piping.

2Check the Indoor/outdoor unit connecting

wire for mis-wiring.

3Check room temperature display on remote

controller and indoor pipe <liquid> tempera­ture. (Refer to the countermeasure on P2.)

4Check if drain-up machine works.

5 Check drain function.

6Check drain float switch. (Refer to the coun-

termeasure on P4 and P5.)

28

6-4. TROUBLESHOOTING BY INFERIOR PHENOMENA

Note: Refer to the manual of outdoor unit for the detail of remote

controller.

Phenomena

Cause

Countermeasure

(1)LED2 on indoor controller board

is off.

• When LED1 on indoor controller board is also off.

1 Power supply of rated voltage is not supplied to out-

door unit.

2 Defective outdoor controller circuit board

3 Power supply of 220~240V is not supplied to indoor

unit.

4 Defective indoor controller board

1 Check the voltage of outdoor power

supply terminal block (L, N) or (L

3, N).

• When AC 220~240V is not detected.
Check the power wiring to outdoor unit
and the breaker.

• When AC 220~240V is detected.

—Check 2 (below).

2 Check the voltage between outdoor

terminal block S1 and S2.

• When AC 220~240V is not detected.

Check the fuse on outdoor controller
circuit board.

Check the wiring connection.

• When AC 220~240V is detected.

—Check 3 (below).

3 Check the voltage between indoor terminal

block S1 and S2.

• When AC 220~240V is not detected.
Check indoor/outdoor unit connecting
wire for mis-wiring.

• When AC 220~240V is detected.

—Check 4 (below).

4 Check the fuse on indoor controller board.

Check the wiring connection.
If no problem are found, indoor controller
board is defective.

(2)LED2 on indoor controller board

is blinking.

• When LED1 on indoor controller board is also blinking.
Connection failure of indoor/outdoor unit connecting
wire

• When LED1 is lit.

1 Mis-wiring of remote controller wires

Under twin triple indoor unit system, 2 or more indoor
units are wired together.

2 Refrigerant address for outdoor unit is wrong or not

set.

Under grouping control system, there are some units
whose refrigerant address is 0.

3 Short-cut of remote controller wires
4 Defective remote controller

Check indoor/outdoor unit connecting wire
for connection failure.

1 Check the connection of remote con-

troller wires in case of twin triple indoor
unit system. When 2 or more indoor units
are wired in one refrigerant system,
connect remote controller wires to one of
those units.

2 Check the setting of refrigerant address

in case of grouping control system.

If there are some units whose refrigerant
addresses are 0 in one group, set one of
the units to 0 using SW1 (3-6) on outdoor
controller circuit board.

34 Remove remote controller wires and

check LED2 on indoor controller board.

• When LED2 is blinking, check the
short-cut of remote controller wires.

• When LED2 is lit, connect remote
controller wires again and:

if LED2 is blinking, remote controller
is defective; if LED2 is lit, connection
failure of remote controller terminal
block etc. has returned to normal.

29

6-5. TEST POINT DIAGRAM

6-5-1. Indoor controller board

CN01 Power supply voltage (220 - 240VAC)

SWE Emergency operation

SW1 Model selection

SW2 Capacity setting

CN32 Remote start/stop adapter

CN22 For MA remote controller cable con-

nection
(10 - 13 VDC (Between 1 and 3.))

CN51 Centralized control

CN41 JAMA standard HA terminal A

CN44 Thermistor

(liquid/condenser/evaporator
temperature)

CN4F Float thermistor

CN20 Thermistor (Inlet temperature)

CN3C Indoor-outdoor transmission

(0 - 24VDC)

CNMF Fan motor output

1 - 4: 310 - 340 VDC
5 - 4: 15 VDC
6 - 4: 0 - 6.5 VDC
7 - 4: Stop 0 or 15 VDC
Run 7.5 VDC

(0 - 15 pulse)

CNP Drain-up mechanism output (200VAC)

CN2L LOSSNAY

CN90 Wireless remote controller

(*1)

V

FG

Voltage on the (-) side of PC672 and
C955
(Same with the voltage between 7 (+)
and 4 (-) of CNMF)

V

CC

Voltage between the C955 pins 15
VDC
(Same with the voltage between 5 (+)
and 4 (-) of CNMF)

V

sp Voltage between the C626 pins

0VDC (with the fan stopped)
1 - 6.5VDC (with the fan in operation)
(Same with the voltage between 6 (+)
and 4 (-) of CNMF)

CN3C

CNP

Fuse(6.3A 250V)

CNMF

CN20

CN44

CN90

CN4F

LED1

LED2

LED3

SWE

CN2L

C626

PC672

SW2

CN41

CN22

SW1

CN32

CN51

CN01

C955

30

6-6. TROUBLE CRITERION OF MAIN PARTS

Room temperature
thermistor
(TH1)

Condenser/evaporator
temperature thermistor
(TH5)

Measure the resistance with a tester.
(Part temperature 10°C ~ 30°C)

Pipe temperature
thermistor/liquid
(TH2)

Wiring diagram

Check method and criterion

Part name

Normal

8kΩ~20kΩ

Abnormal

Opened or short-circuited

Motor

Board with build-in motor

Current detecting resistor

Regulator Hall IC

Motor winding

Powe r

device

Pre

driver

Vm (Power supply for motor)

Vcc (Power supply for control)

Vsp (Speed command voltage)

PG (Pulse output for rotation)

GND

31

6-7. DC FAN MOTOR (FAN MOTOR/ INDOOR CONTROLLER BOARD)

Notes

· High voltage is applied to the connecter (CNMF) for the fan motor. Give attention to the service.

· Do not pull out the connector (CNMF) for the motor with the power supply on.
(It causes trouble of the indoor controller circuit

board and fan motor.)

Self check
Symptom : The indoor fan cannot turn around.

No

NG

NG

Wiring contact check

Contact of fan motor connector (CNMF)

Check the fuse (FUSE) on indoor
controller board.

Power supply check (Remove the connector (CNMF))

Measure the voltage in the indoor controller circuit

board.

TEST POINT

1 :VDC (between 1 (+) and 4 (-) of the fan connector): VDC DC310~340V

TEST POINT 2 :VCC (between 5 (+) and 4 (-) of the fan connector): VCC DC15V

Wiring recovery

Replace drain pump (DP).

Replace indoor controller board.

Replace the fan motor.

Replace indoor controller board (I.B).
Replace fan motor (MF).

Replace indoor

controller board.

Replace the fan motor.

Is the voltage normal?

Is there no contact failure?

Ye s

1

2

Ye s

No

Did the fuse blow?

Check the drain pump (DP)
Is the resistance between
terminals normal?

No

Ye s

Ye s

No

Check the operation of fan. END

Ye s

OK

Check the operation. END

OK

Check method of DC fan motor (fan motor / indoor controller circuit board)

32

1. Control box

1. Removing the control box cover
(1) Remove the two fixing screws on the cover (A)

to remove it.

2. Thermistor (Intake air)

1. Remove the control box cover according to the
procedure in section [1].

(1) Pull out the thermistor holder (B) and thermis-

tor (C) on the control box.

(A)

Fig. 1

Fig. 2

SEZ-KD·VA model only

KD71VA(L) model only

(B),(C)

Fig. 3

DISASSEMBLY PROCEDURE7

Exercise caution when removing heavy parts.

33

3. Drainpan

Exercise caution when removing heavy parts.

1. Removing the filter and the bottom plate
(1) Push up the tab on the filter, and pull out the

filter in the direction of the arrow 1.

(2) Remove the fixing screws on the bottom plate

(D), (E) to remove it.

2. Removing the drainpan
(1) Pull out the drain pan in the direction of the

arrow 1.

Note

• Drain the water out of the drain pan before
removing it.

• To avoid dew condensation, use insulated
screws in the places marked with circles in
Figure 6.

(D) (E)

(a)

(a)

(a)

(a)

(a) Tab

Fig. 4

Fig. 5

Insulation material

(E)

Fig. 6

34

4. Thermistor (Condenser / evaporator)
(Liquid pipe)

1. Remove the drain pan according to the proce-

dure in section [3].

2. Removing the Heat exchanger cover
(1) Remove the four fixing screws on the heat

exchanger cover (F) to remove it.

3. Removing the thermistor
(1) Remove the thermistor (G) from the thermistor

holder (H) on the copper tube.

Thermistor size
Liquid pipe: ø8mm
Condenser / evaporator: ø6mm

(F)

Fig. 7

(G),(H)

Fig. 8

Exercise caution when removing heavy parts.

35

3. Removing the motor cable
(1) Remove the motor cable threw the rubber

bush.

4. Removing the fan motor and the Sirocco fan
(1) Remove the two motor fixing screws to

remove the motor and the Sirocco fan in the
direction of arrow 3.

Fig. 11

(2) Remove the four fan case fixing screws to

take the top half of the fan casing off.

Fig. 12

Exercise caution when removing heavy parts.

2. Removing the fan casing (bottom half)
(1) Squeeze the tabs on the fan casing to remove

it in the direction of arrow 2.

(a)

(a) Tab

Fig. 10

5. Fan and fan motor

1. Removing the filter and the bottom plate
(1) Push down the tab on the filter, and pull out

the filter in the direction of the arrow 1.

(2) Remove the fixing screws on the bottom plate

(J) to remove it.

(J)

(a)

(a) Tab

(a)

(a)

(a)

Fig. 9

36

(K)

Fig. 13

(2) Remove the two bearing retainer screws to

remove the bearing.

Fig. 14

6. Bearing [KD50·60·71VAQ model only]

1. Removing the bearing
(1) Remove the two fixing screws on the bearing

cover (K) to remove it.

7. Heat exchanger

1. Remove the drain pan according to the proce-

dure in section [3].

2. Remove the heat exchanger cover according to

the procedure in section [4] 2.

3. Removing the cover
(1) Remove the two fixing screws on the cover (L)

to remove it.

4. Removing the Heat exchanger
(1) Remove the fixing screws on the heat

exchanger (M) to remove it.

(L)

Fig. 15

(M)

Fig. 16

Exercise caution when removing heavy parts.

New publication, effective Dec. 2010

Specifications subject to change without notice.

HWE10080
Printed in Japan

TM