Mitsubishi SEZ-KD09NA User Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

Series SEZ

Model name

Model name
<Indoor unit>

<Indoor unit>

SEZ-KD09NA(4)
SEZ-KD12NA(4)
SEZ-KD15NA(4)
SEZ-KD18NA(4)

2012

INDOOR UNIT

TEMP.

WIRED REMOTE CONTROLLER

ON/OFF

CONTENTS

1. PART NAMES AND FUNCTIONS ···········································································2

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

3. OUTLINES AND DIMENSIONS·············································································14

4. WIRING DIAGRAM ································································································15

5. REFRIGERANT SYSTEM DIAGRAM····································································17

6. HEATER CONTROL ······························································································18

7. TROUBLESHOOTING ···························································································21

8. DISASSEMBLY PROCEDURE··············································································34

1

Air outlet duct flange

Air outlet

Air inlet

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

PART NAMES AND FUNCTIONS

Indoor Unit
SEZ-KD09NA(4)
SEZ-KD12NA(4)
SEZ-KD15NA(4)
SEZ-KD18NA(4)

Wired remote controller

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

● Operation buttons

2

● 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 (The 12 hour clock or The 24
hour clock), 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”

● When power is turned ON for the first time, it is normal that “PLEASE WAIT” is displayed on the room temperature indication

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.

(For max. 2minutes). Please wait until this “PLEASE WAIT” indication disappears then start the operation.

3

2

SPECIFICATIONS

Model Name
Capacity

Power source
Power input
Current
Temperature set range Remote controller
Airflow direction
Fan

Type x Quantity
External static press
Motor type
Motor output
Driving mechanism
Airflow rate(Low-Mid-High)
Airflow rate(Low-Mid-High)

Airflow rate(Low-Mid-High)
External finish
External dimension
H x W x D
Net weight
Wiring

Refrigerant
piping diameter

Drain piping diameter
Sound level (Low-Mid-High)
(measured in anechoic room)
Insulation material
Air filter
Refrigerant control device
Protection devices
Heat exchanger
Varistor
Terminal block
Power outlet A
Standard
attachment

Remark

Note

Min.size of wire
Amperage of wire breaker
Liquid
Gas

Document
Accessory

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

<Cooling> Indoor:80˚FD.B. / 67˚FW.B. (26.7˚CD.B. / 19.4˚CW.B.) Outdoor:95˚FD.B. (35˚CD.B.)
<Heating> Indoor:70

2.Power consumption. Run current at 0.06[in.WG] (15Pa) (external static pressure)

3.Cooling capacity value at 1:1system
Heating capacity value at 1:1system

4. < > SEZ-KD NA only

R410A
R410A

˚FD.B. (21.1˚CD.B.) Outdoor:47˚FD.B. / 43˚FW.B. (8.3˚CD.B. / 6.1˚CW.B.)

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

BTU/h

kW
A

˚F(˚C)

in.WG(Pa)

kW

m3/min

CFM
L/S

mm
In.
kg
in.(mm)
A
in.(mm)
in.(mm)
in.(mm)

dB<A>

SEZ-KD09NA(4)

Cooling

8100

208/230V (60Hz)

0.06

0.51

67 to 86 (19 to 30)

0.02-0.06-0.14-0.20 (5-15-35-50)

7-7/8 x 31-1/8 x 27-9/16

Polystyrene foam, Polyethylene foam, Urethane foam

PP Honeycomb fabric (washable)

Cross fin (Aluminum fin and copper tube)

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

Installation Manual, Instruction Book

Drain hose (flexible joint), <Wired Remote Controller>

-

Sirocco fan x 2

DC brushless motor

0.096

Direct-driven

5.5-7.0-9.0

194-247-317

91-116-150
Galvanized

200 x 790 x 700

18

1/8 (1.6)

15
ø1/4 (ø6.35) Flare
ø3/8 (ø9.52) Flare

O.D. 1-1/4 (32)

23-26-30

-

Fuse (250V 6.3A)

ERZV10D471

10

Heating

10900

0.04

0.39

63 to 83 (17 to 28)

SEZ-KD12NA(4)

Cooling

11500

208/230V (60Hz)

0.07

0.57

67 to 86 (19 to 30)

0.02-0.06-0.14-0.20 (5-15-35-50)

Polystyrene foam, Polyethylene foam, Urethane foam

PP Honeycomb fabric (washable)

Cross fin (Aluminum fin and copper tube)

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

Installation Manual, Instruction Book

Drain hose (flexible joint), <Wired Remote Controller>

-

Sirocco fan x 2

DC brushless motor

0.096

Direct-driven

7.0-9.0-11.0
247-317-388
116-150-183

Galvanized

200 x 990 x 700

7-7/8 x 39 x 27-9/16

21

1/8 (1.6)

15
ø1/4 (ø6.35) Flare
ø3/8 (ø9.52) Flare

O.D. 1-1/4 (32)

23-28-33

-

Fuse (250V 6.3A)

ERZV10D471

10

Heating

13600

0.05

0.46

63 to 83 (17 to 28)

4

Model Name
Capacity

Power source
Power input
Current
Temperature set range Remote controller
Airflow direction
Fan

Type x Quantity
External static press
Motor type
Motor output
Driving mechanism
Airflow rate(Low-Mid-High)
Airflow rate(Low-Mid-High)

Airflow rate(Low-Mid-High)
External finish
External dimension

H x W x D
Net weight
Wiring

Refrigerant
piping diameter

Drain piping diameter
Sound level (Low-Mid-High)
(measured in anechoic room)
Insulation material
Air filter
Refrigerant control device
Protection devices
Heat exchanger
Varistor
Terminal block
Power outlet A
Standard
attachment

Min.size of wire
Amperage of wire breaker
Liquid
Gas

R410A
R410A

Document
Accessory

Remark

Note

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

<Cooling> Indoor:80˚FD.B. / 67˚FW.B. (26.7˚CD.B. / 19.4˚CW.B.) Outdoor:95˚FD.B. (35˚CD.B.)
<Heating> Indoor:70

2.Power consumption. Run current at 0.06[in.WG] (15Pa) (external static pressure)

3.Cooling capacity value at 1:1system
Heating capacity value at 1:1system

4. < > SEZ-KD NA only

˚FD.B. (21.1˚CD.B.) Outdoor:47˚FD.B. / 43˚FW.B. (8.3˚CD.B. / 6.1˚CW.B.)

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

BTU/h

kW
A

˚F(˚C)

in.WG(Pa)

kW

m3/min

CFM
L/S

mm
In.
kg
in.(mm)
A
in.(mm)
in.(mm)
in.(mm)

dB<A>

SEZ-KD15NA(4)

Cooling

14100

208/230V (60Hz)

0.09

0.74

67 to 86 (19 to 30)

0.02-0.06-0.14-0.20 (5-15-35-50)

Polystyrene foam, Polyethylene foam, Urethane foam

PP Honeycomb fabric (washable)

Cross fin (Aluminum fin and copper tube)

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

Installation Manual, Instruction Book

Drain hose (flexible joint), <Wired Remote Controller>

-

Sirocco fan x 3

DC brushless motor

0.096

Direct-driven

10.0-12.5-15.0
353-441-529
167-208-250

Galvanized

200 x 990 x 700

7-7/8 x 39 x 27-9/16

23

1/8 (1.6)

15
ø1/4 (ø6.35) Flare
ø1/2 (ø12.7) Flare

O.D. 1-1/4 (32)

30-34-37

-

Fuse (250V 6.3A)

ERZV10D471

20

Heating

18000

0.07

0.63

63 to 83 (17 to 28)

SEZ-KD18NA(4)

Cooling

17200

208/230V (60Hz)

0.09

0.74

67 to 86 (19 to 30)

0.02-0.06-0.14-0.20 (5-15-35-50)

7-7/8 x 46-7/8 x 27-9/16

Polystyrene foam, Polyethylene foam, Urethane foam

PP Honeycomb fabric (washable)

Cross fin (Aluminum fin and copper tube)

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

Installation Manual, Instruction Book

Drain hose (flexible joint), <Wired Remote Controller>

-

Sirocco fan x 4

DC brushless motor

0.096

Direct-driven

12.0-15.0-18.0
423-529-635
200-250-300

Galvanized

200 x 1190 x 700

27

1/8 (1.6)

15
ø1/4 (ø6.35) Flare
ø1/2 (ø12.7) Flare

O.D. 1-1/4 (32)

30-34-38

-

Fuse (250V 6.3A)

ERZV10D471

20

Heating

21600

0.07

0.63

63 to 83 (17 to 28)

5

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-KD09NA(4)

External static pressure:

0.06[in.WG](15Pa)

High

Middle

30

SPL(dB)

26

Low

23

LINE

<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-KD09NA(4)

External static pressure:

0.02[in.WG](5Pa)

High

Middle

29

SPL(dB)

25

Low

22

LINE

<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-KD09NA(4)

External static pressure:

0.20[in.WG](50Pa)

High

Middle

33

SPL(dB)

29

Low

25

LINE

<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-KD09NA(4)

External static pressure:

0.14[in.WG](35Pa)

High

Middle

31

SPL(dB)

28

Low

24

LINE

<60Hz>

NOTCH

SOUND 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.

6

SEZ-KD12NA(4)

External static pressure:

0.02[in.WG](5Pa)

90

NOTCH

High

Middle

Low

SPL(dB)

33
28
23

<60Hz>

LINE

SEZ-KD12NA(4)

External static pressure:

0.06[in.WG](15Pa)

90

NOTCH

High

Middle

Low

SPL(dB)

33
28
23

<60Hz>

LINE

80

70

60

50

40

30

APPROXIMATE

20

TERESHOLD OF

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

HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

SEZ-KD12NA(4)

External static pressure:

0.14[in.WG](35Pa)

90

NOTCH

High

Middle

Low

SPL(dB)

34
29
24

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

<60Hz>

LINE

80

70

60

50

40

30

APPROXIMATE

20

TERESHOLD OF

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

HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

SEZ-KD12NA(4)

External static pressure:

0.20[in.WG](50Pa)

90

NOTCH

High

Middle

Low

SPL(dB)

35
31
25

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

<60Hz>

LINE

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

80

70

60

50

40

30

APPROXIMATE

20

TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

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

80

70

60

50

40

30

APPROXIMATE

20

TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

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.

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-KD15NA(4)

External static pressure:

0.06[in.WG](15Pa)

High

Middle

37

SPL(dB)

34

Low

30

LINE

<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-KD15NA(4)

External static pressure:

0.02[in.WG](5Pa)

High

Middle

36

SPL(dB)

33

Low

29

LINE

<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-KD15NA(4)

External static pressure:

0.20[in.WG](50Pa)

High

Middle

39

SPL(dB)

36

Low

32

LINE

<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-KD15NA(4)

External static pressure:

0.14[in.WG](35Pa)

High

Middle

38

SPL(dB)

35

Low

31

LINE

<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.

8

SEZ-KD18NA(4)

External static pressure:

0.02[in.WG](5Pa)

90

NOTCH

High

Middle

Low

SPL(dB)

37
33
29

<60Hz>

LINE

SEZ-KD18NA(4)

External static pressure:

0.06[in.WG](15Pa)

90

NOTCH

High

Middle

Low

SPL(dB)

38
34
30

<60Hz>

LINE

80

70

60

50

40

30

APPROXIMATE

20

TERESHOLD OF

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

HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

SEZ-KD18NA(4)

External static pressure:

0.14[in.WG](35Pa)

90

NOTCH

High

Middle

Low

SPL(dB)

39
35
31

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

<60Hz>

LINE

80

70

60

50

40

30

APPROXIMATE

20

TERESHOLD OF

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

HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

SEZ-KD18NA(4)

External static pressure:

0.20[in.WG](50Pa)

90

NOTCH

High

Middle

Low

SPL(dB)

39
36
32

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

<60Hz>

LINE

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

80

70

60

50

40

30

APPROXIMATE

20

TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

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

80

70

60

50

40

30

APPROXIMATE

20

TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

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

INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW

SEZ-KD09NA(4)

(External static pressure 0.06[in.WG](15Pa)) 208/230V 60Hz

0

10

20

30

40

50

45678910

Airflow rate(m

3

/min)[CFM]

[141] [176] [212] [247] [282] [318] [353]

External static pressure [in.WG](Pa)

[0.20]

[0.16]

[0.12]

[0.08]

[0.04]

Middle

Low

High

Limit

Rated point

0

40

30

20

10

45678910

Airflow rate(m

3

/min)[CFM]

External static pressure [in.WG](Pa)

SEZ-KD09NA(4)

(External static pressure 0.02[in.WG](5Pa)) 208/230V 60Hz

Middle

Low

High

Rated point

Limit

[0.16]

[0.12]

[0.08]

[0.04]

[141] [176] [212] [247] [282] [318] [353]

45678910

Airflow rate(m

3

/min)[CFM]

[141] [176] [212] [247] [282] [318] [353]

0

10

20

30

40

50

60

70

80

External static pressure [in.WG](Pa)

SEZ-KD09NA(4)

(External static pressure 0.20[in.WG](50Pa)) 208/230V 60Hz

45678910

Airflow rate(m

3

/min)[CFM]

[141] [176] [212] [247] [282] [318] [353]

Middle

Low

High

Limit

Rated point

[0.32]

[0.28]

[0.24]

[0.20]

[0.16]

[0.12]

[0.08]

[0.04]

0

10

20

30

40

50

60

70

80

SEZ-KD09NA(4)

(External static pressure 0.14[in.WG](35Pa)) 208/230V 60Hz

45678910

Airflow rate(m

3

/min)[CFM]

[141] [176] [212] [247] [282] [318] [353]

External static pressure [in.WG](Pa)

[0.32]

[0.28]

[0.24]

[0.20]

[0.16]

[0.12]

[0.08]

[0.04]

Middle

Low

High

Limit

Rated point

10

SEZ-KD12NA(4)

(External static pressure 0.02[in.WG](5Pa)) 208/230V 60Hz

40

[0.16]

30

[0.12]

20

[0.08]

External static pressure [in.WG](Pa)

10

[0.04]

Low

0

6789101112

[212] [282][247] [353] [388][318] [424]

Middle

Airflow rate(m

3

/min)[CFM]

High

Rated point

Limit

SEZ-KD12NA(4)

(External static pressure 0.06[in.WG](15Pa)) 208/230V 60Hz

50

[0.20]

40

[0.16]

30

[0.12]

20

[0.08]

External static pressure [in.WG](Pa)

10

[0.04]

0

6789101112

[212] [282][247] [353] [388][318] [424]

Low

Middle

Airflow rate(m

3

/min)[CFM]

High

Rated point

Limit

SEZ-KD12NA(4)

(External static pressure 0.14[in.WG](35Pa)) 208/230V 60Hz

80

[0.32]

70

[0.28]

60

[0.24]

50

[0.20]

40

[0.16]

Middle

3

/min)[CFM]

Rated point

30

[0.12]

External static pressure [in.WG](Pa)

20

[0.08]

10

[0.04]

0

6789101112

[212] [282][247] [353] [388][318] [424]

Low

Airflow rate(m

Limit

High

SEZ-KD12NA(4)

(External static pressure 0.20[in.WG](50Pa)) 208/230V 60Hz

80

[0.32]

70

[0.28]

60

[0.24]

50

[0.20]

40

[0.16]

30

[0.12]

External static pressure [in.WG](Pa)

20

[0.08]

10

[0.04]

0

6789101112

[212] [282][247] [353] [388][318] [424]

Low

Airflow rate(m

Middle

3

Limit

Rated point

/min)[CFM]

High

11

SEZ-KD15NA(4)

(External static pressure 0.06[in.WG](15Pa)) 208/230V 60Hz

891011 12 13 14 15 16

0

10

20

30

40

50

External static pressure [in.WG](Pa)

[0.20]

[0.16]

[0.12]

[0.08]

[0.04]

Airflow rate(m

3

/min)[CFM]

[282] [318] [353] [388] [424] [494][459] [530] [565]

High

Limit

Rated point

Middle

Low

SEZ-KD15NA(4)

(External static pressure 0.02[in.WG](5Pa)) 208/230V 60Hz

Airflow rate(m

3

/min)[CFM]

891011 12 13 14 15 16

0

40

30

20

10

External static pressure [in.WG](Pa)

[0.16]

[0.12]

[0.08]

[0.04]

[282] [318] [353] [388] [424] [494][459] [530] [565]

Middle

Low

High

Limit

Rated point

SEZ-KD15NA(4)

(External static pressure 0.20[in.WG](50Pa)) 208/230V 60Hz

891011 12 13 14 15 16

0

10

20

30

40

50

60

70

80

External static pressure [in.WG](Pa)

[0.32]

[0.28]

[0.24]

[0.20]

[0.16]

[0.12]

[0.08]

[0.04]

Airflow rate(m

3

/min)[CFM]

[282] [318] [353] [388] [424] [494][459] [530] [565]

Middle

Low

High

Limit

Rated point

SEZ-KD15NA(4)

(External static pressure 0.14[in.WG](35Pa)) 208/230V 60Hz

891011 12 13 14 15 16

0

10

20

30

40

50

60

70

80

External static pressure [in.WG](Pa)

[0.32]

[0.28]

[0.24]

[0.20]

[0.16]

[0.12]

[0.08]

[0.04]

Airflow rate(m

3

/min)[CFM]

[282] [318] [353] [388] [424] [494][459] [530] [565]

Middle

Low

High

Limit

Rated point

12

SEZ-KD18NA(4)

(External static pressure 0.02[in.WG](5Pa)) 208/230V 60Hz

40

[0.16]

Limit

30

[0.12]

20

[0.08]

External static pressure [in.WG](Pa)

10

[0.04]

Low

0

910111213141516171819

[318] [353] [388] [424] [494][459] [530] [565] [600] [671][636]

Middle

Airflow rate(m

High

3

/min)[CFM]

Rated point

SEZ-KD18NA(4)

(External static pressure 0.06[in.WG](15Pa)) 208/230V 60Hz

50

[0.20]

Limit

40

[0.16]

High

30

[0.12]

Middle

20

[0.08]

External static pressure [in.WG](Pa)

10

[0.04]

0

910111213141516171819

[318] [353] [388] [424] [494][459] [530] [565] [600] [671][636]

Low

Airflow rate(m

3

/min)[CFM]

Rated point

SEZ-KD18NA(4)

(External static pressure 0.14[in.WG](35Pa)) 208/230V 60Hz

80

[0.32]

70

[0.28]

60

[0.24]

50

[0.20]

40

[0.16]

30

[0.12]

External static pressure [in.WG](Pa)

20

[0.08]

10

[0.04]

0

910111213141516171819

[318] [353] [388] [424] [494][459] [530] [565] [600] [671][636]

Low

Middle

Airflow rate(m

3

/min)[CFM]

Limit

High

Rated point

SEZ-KD18NA(4)

(External static pressure 0.20[in.WG](50Pa)) 208/230V 60Hz

80

[0.32]

70

[0.28]

60

[0.24]

50

[0.20]

40

[0.16]

30

[0.12]

External static pressure [in.WG](Pa)

20

[0.08]

10

[0.04]

0

910111213141516171819

[318] [353] [388] [424] [494][459] [530] [565] [600] [671][636]

Low

Airflow rate(m

Limit

Middle

3

/min)[CFM]

High

Rated point

13

3

(46-7/8)

1190

(39)

990

(31-1/8)

790

N

(48-25/32)

1239

(40-29/32)

1039

(33-1/16)

839

M

Drain pipe(O.D.ø32(1-1/4))

Terminal block (Remote controller transmission line)

Terminal block (Indoor/outdoor connecting line)

2

Refrigerant piping
flare connection (liquid)

ø12.7(1/2)

mm(in.)

(35-7/16)

(27-9/16)

(19-11/16)

(41-3/4)

(33-7/8)

(26)

(47-1/4)

(39-3/8)

(31-1/2)

(39-3/8)

(31-1/2)

(23-5/8)

(41-3/4)

(33-7/8)

(26)

(47-3/16)

(39-5/16)

(31-7/16)

(45-3/8)

(37-1/2)

(29-5/8)

(43-5/16)

(35-7/16)

(27-9/16)

700

Drain pipe(O.D.ø32(1-1/4))

(Emergency draining)

ø6.35(1/4)

ø9.52(3/8)

SEZ-KD15NA(4)

900 952 998 860

9

800 1000 860

7

700

20

24

16

L

900

500

K

9

5

J

1060

660

H

800600

7

660798752

Knockout hole ø27(1-3/32)

(Remote controller transmission line)

Knockout hole ø27(1-3/32)

(Indoor/outdoor connecting line)

G

1200

F

1000

E

11

D

1060

C

1100B1152

SEZ-KD09NA(4)

SEZ-KD12NA(4)

SEZ-KD18NA(4)

Model A

1198

Gas pipe Liquid pipe

L-ø2.9(1/8)

2X2-ø2.9(1/8)

2XE-ø2.9(1/8)

Control box

Air filter

Suspension bolt hole
4-14X30(9/16X1-3/16) Slot

Refrigerant piping
flare connection (gas)

1

1

2

Drain pipe(O.D.ø32(1-1/4))

(Spontaneous draining)

Air
inlet

Air
outlet

N

M

175±5(6-29/32±7/32)

Less than 300

Less than 550

(11-13/16)

(21-21/32)

More than 20

More than 10

57(2-1/4)

57(2-1/4)

(1-31/32 ~ 5-29/32)

(30-19/32)

(17-23/32)

(11-13/16)

(17-23/32)

More than 300

(13/16)

(13/32)

(3-9/16)

(5-29/32)

(2-25/32)(4-19/32)

70

10(13/32)

(3-15/16)

(1-15/16) (24-5/8)

450

37(1-15/32)

200(7-7/8)

H

157.5(6-7/32)20(13/16)

100(3-15/16)

37(1-15/32)

12(1/2)

12(1/2)

88(3-15/32)

100(3-15/16)XJ=K

100(3-15/16)

88(3-15/32)

777

50(1-31/32)

50 ~ 150

50(1-31/32)

G

450

10(13/32)

49

25(1)

170(6-23/32)

102(4-1/32)

116

100 25(1)

23(29/32)

C

B (Suspension bolt pitch)23(29/32)

A

90

D (Duct)

100(3-15/16)X(E-1)=F

100(3-15/16)

15(19/32)

Drain hose (I.D.ø32(1-1/4))

<accessory>

(Actual length)

Note2

Access door

Required space for service and maintenance

Access door

Ceiling surface

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

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-KD15NA(4) model, which has 3 fans.
SEZ-KD09,12NA(4) models have 2 fans.
SEZ-KD18NA(4) 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.

159(6-9/32)

345(13-19/32)

20(13/16)

30(1-3/16)

23(29/32)

270(10-21/32)

20(13/16)

625(Suspension bolt pitch)

700(27-9/16)
677(26-21/32)

150(Duct)

OUTLINES AND DIMENSIONS

SEZ-KD09NA(4)
SEZ-KD12NA(4)
SEZ-KD15NA(4)
SEZ-KD18NA(4)

Unit : mm(in.)

14

21

1~

M

135

31

1456734

12

4231

12

3

TB15 TB4

PARTS LOCATION

I

. B.

CONTROL BOX

Drainpump

(Yellow)

CN24

LED1

INSIDE SECTION OF CONTROL BOX

CN22

(Red)

LED1

CN3C

CNMF

SW2SW1

CN90

CN32

CN20CN44CN4F

CN41

SWE

ON

OFF

CN51

(Blue)

TO MA REMOTE
CONTROLLER

FS TH2 TH5 TH1

Fan motor

TB15

CN2L

(Blue)

LED3

LED2

I. B.

S1

TB4

S3

S2

TO
OUTDOOR
UNIT

CONNECTOR (BACK-UP HEATING)CN24

CN90 CONNECTOR (WIRELESS)

TB4

LED2

LED3

LED1 POWER SUPPLY (I.B.)

TRANSMISSION (INDOOR-OUTDOOR)

POWER SUPPLY (I.B.)

FS FLOAT SWITCH

TB15

ZNR01,02 VARISTOR

AUX. RELAYX1

FUSE FUSE AC250V 6.3A

DSA

CONNECTOR (CENTRALLY CONTROL)

CN41

CN51

CONNECTOR (HA TERMINAL-A)

CN2L

NAME

SYMBOL EXPLANATION

SW1

SW2

INDOOR CONTROLLER BOARD

CN32

I. B.

SYMBOL SYMBOL NAME

CONNECTOR (LOSSNAY)

CONNECTOR (REMOTE SWITCH)

SWE

ARRESTER

SWITCH (FOR MODEL SELECTION)

SWITCH (FOR CAPACITY CODE)

CONNECTOR (EMERGENCY OPERATION)

TH1 INTAKE AIR TEMP. THERMISTOR

TH2 PIPE TEMP. THERMISTOR/LIQUID

TH5 COND./EVA. TEMP. THERMISTOR

TERMINAL BLOCK
(REMOTE CONTROLLER TRANSMISSION LINE)

TERMINAL BLOCK
(INDOOR/OUTDOOR CONNECTING LINE)

Note1.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.

4.Use copper supply wire.

X1

DC310~340V
Rectify circuit

U

U

FUSE

ZNR01

(Black)

CN01

CNP

ZNR02

(Blue)

DSA

1

M

1
2

t°t

°

t

°

4

WIRING DIAGRAM

SEZ-KD09NA
SEZ-KD12NA
SEZ-KD15NA
SEZ-KD18NA

15

SEZ-KD09NA4

12

1~

M

ON
OFF

SW6

DC294-340V

RECTIFY CIRCUIT

RU

SW1

BZ1

SW2

LED1

CN1

W.B.

RFI

R.B.

1

2

X1

FUSE

DRAINPUMP

135

(BLACK)

CN01

CNP

INSIDE SECTION OF CONTROL BOX

(BLUE)

CN22

31

1

LED1

CN3C

SW2SW1

CN32

CN30(GREEN)

(RED)
CN20

CN41

SWE

ON

OFF

CN51

(BLUE)

1474

59

95

2

12

41

FS TH2 TH5 TH1

FAN MOTOR

TB15

1

2

(RED)

CN105

(RED)

CN4F

(WHITE)

CN90

(WHITE)

CN44

(WHITE)

CNMF

(WHITE)

12

CN2L

TB6

(BLUE)

LED3

3

LED2

I. B.

S1

TB4

S3

S2

1

1

1

19

TRANSMISSION
WIRES DC 12V

-

+

MS

3~

SW2

SWITCH (HEATING ON/OFF)
SWITCH (COOLING ON/OFF)

SW1

RECEIVING UNIT

RU

LED (RUN INDICATOR)

LED1

BUZZER

BZ1

IR WIRELESS REMOTE CONTROLLER BOARD

COND./EVA. TEMP. THERMISTOR

TH5

PIPE TEMP. THERMISTOR/LIQUID

TH2

INTAKE AIR TEMP. THERMISTOR

TH1

CONNECTOR (EMERGENCY OPERATION)

SWITCH (FOR CAPACITY CODE)

SWITCH (FOR MODEL SELECTION)

SWITCH (FOR EMERGENCY OPERATION))

SWE

CONNECTOR (REMOTE SWITCH)

CONNECTOR (LLC)

CONNECTOR (LOSSNAY)
CONNECTOR (BACK-UP HEATING)

NAME NAMESYMBOL SYMBOLSYMBOL

I.B. I.B.

W.B.

OPTIONAL PARTS

R.B.

CN32

CN30

INDOOR CONTROLLER BOARD INDOOR CONTROLLER BOARD

SW2

SW1

SW6

SYMBOL EXPLANATION

NAME

CN2L
CN24

CONNECTOR (HA TERMINAL-A)
CN51
CN90
CN105

CN41

CONNECTOR (CENTRALLY CONTROL)

CONNECTOR (WIRELESS)

CONNECTOR

(RADIO FREQUENCY INTERFACE)

FUSE AC250V 6.3A

FUSE
X1

AUX. RELAY

TB15

FLOAT SWITCH

RADIO FREQUENCY INTERFACE FOR RF THERMOSTAT

FS

RFI

REMOTE CONTROLLER BOARD

POWER SUPPLY (I.B.)

TERMINAL BLOCK
(REMOTE CONTROLLER TRANSMISSION LINE)

TERMINAL BLOCK
(INDOOR/OUTDOOR CONNECTING LINE)

TERMINAL BLOCK
(REMOTE CONTROLLER TRANSMISSION LINE)

TRANSMISSION (INDOOR-OUTDOOR)

POWER SUPPLY (I.B.)

LED1

TB6

LED3

LED2

TB4

Note1. 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 matchingterminal numbers (S1,S2,S3).

3. Symbols used in wiring diagram above are as follows.

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

4. Use copper supply wire.

TO OUTDOOR
UNIT

(YELLOW)

CN24

TB15 TB4

PARTS LOCATION

I

. B.

CONTROL BOX

SEZ-KD12NA4
SEZ-KD15NA4
SEZ-KD18NA4

16

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)

REFRIGERANT SYSTEM DIAGRAM

SEZ-KD09NA(4)
SEZ-KD12NA(4)
SEZ-KD15NA(4)
SEZ-KD18NA(4)

17

6

6-1. Control specifications and Function setting

Table 1 shows how the field-installed heater is controlled. Select the desired pattern in the table below, and set the

Function on the indoor units as shown in Table 1.

Ta ble.1 [Function table]
Select unit numbers 01 to 03 or all units (AL[wired remote controller] / 07[wireless remote controller])

*Refer to the Installation Manual for function settings.

Mode Setting Mode no. Setting

Initial setting

Heater control

23 1

23 2 -

Heater OFF

Inlet air temp. set temp.

Heater ON

Inlet air temp. < set temp.-4.5˚F(2.5˚C)

The fan will stop and the heater will turn off when
[DEFROST] or [ERROR] is displayed.

The fan will drive and the heater will turn on when
[DEFROST] or [ERROR] is displayed.

Set temp.
Set temp.-1.8

˚

F(1˚C)

Set tem p.-4 .5

˚

F(2.5˚C)

Inlet ai r temp.

Heater output

OFF

ON

Heater OFF

Inlet air temp. set temp.

Heater ON

Inlet air temp. < set temp.-1.8˚F(2.5˚C)

Set tem p.
Set temp.-1.8

˚

F(2.5˚C)

Inlet air tem p.

Heater output

OFF

ON

6-2. Fan control

*Refer to the Installation Manual for function settings.

By setting the Mode No. 23 in the Function Table in section 6-1 and using CN4Y on the optional parts PAC-YU25HT, the
following patterns of fan control will become possible when [DEFROST] or [ERROR] is displayed.

Fan control patterns when [DEFROST] or [ERROR] is displayed

*1 Fan speed setting

* If a heater is installed in the duct, do not use CN4Y. By doing so, the fan will turn off when the heater is on,
which may result in fire.

Heater is installed in the duct. No heater is installed in the duct.
Use of CN4Y (PAC-YU25HT)
Heater is off.

Heater is on.

Unused*

Fan ON*1

Fan ON*1

Fan OFF

Fan OFF

Used

Setting

Mode no. Setting

Mode

Fan control

Very low

Heating Thermo-OFF [DEFROST] or [ERROR]

STOP

Remote controller setting

Remote controller setting

Remote controller setting

Very low 25

25

25

1

2

3

Initial setting

-

-

HEATER CONTROL

18

6-3. PAC-YU25HT (Optional Parts) installation

The following section describes installation of the External Heater Adapter that connects to SEZ-KD NA
series indoor unit. This products is the special wiring parts to drive an electric heater with the air conditioner.

(1) Parts list

Check that the following parts are included in the package.

1) External output cable (with a yellow connector).............................2 in total

Tw o types of cables with different connectors are included.

2) Panel heater connector.................................................................. 3 in total

White: 1
Green: 2 (2 types)

(2) Connection to the indoor unit

Use the cables that fit the connectors on the indoor unit control board.

1) External output cable (with a yellow connector)
This cable is used to connect a relay circuit for an interlocked operation with either an electric or a panel heater.
Connect the cable to CN24 on the indoor unit control board.

2) Panel heater connector (with a white connector)
This connector is used to perform an interlocked operation with a panel heater. Depending on the indoor unit
control board specification, connect the cable to CN4Y as appropriate

<Image>

CN4Y for FAN control
(PAC-YU25HT)

(3) Locally procured wiring

A basic connection method is shown below.

Remote control board Relay circuit

Electric Heater

power source

Electric Heater
or panel
heater

Preparations in the field

X

Indoor unit

Adapter

Red 1

X

White 2

White 1

(applicable only when a panel
heater is connected)

Maximum cable length
is 10 m (32ft)

3

control board

CN24

YellowWhite

CN4Y

19

For relay X, use the specifications given below.
Rated voltage: 12VDC
Power consumption: 0.9W or less
* Use the diode that is recommended by the relay manufacturer at both ends of the relay coil.

The length of the electrical wiring for the PAC-YU25HT is 2 meters (6-1/2 ft.)

To extend this length, use sheathed 2-core cable.
Control cable type: CVV, CVS, CPEV or equivalent.
Cable size: 0.5 mm

2

~ 1.25 mm2 (16 to 22 AWG)

Don't extend the cable more than 10 meters (32ft)

(4) Wiring restrictions

Keep the length of the cable connecting to the circuit board of the indoor unit shorter than 10 meters (32ft).

Longer than 10 meters (32ft) could cause improper operation.

Use a transit relay when extending wiring such as remote wiring.

Recommended circuit

Wiring diagram

1-phase
power supply

208V, 230V/60Hz

Control board

FS1, 2 ----- Thermal fuse

H1, H2 ----- Heater

26H --------- Overheat

protection thermostat

88H --------- Electromagnetic contactor

FS1

FS2
FS1

FS2

R

S

R

S

CN24

H2

88H

H1

88H

26H

88H

20

7

Lead wires

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

MENU

BACK DAY

MONITOR/SET

CLOCK

ON/OFF

B

C

A

E D F

ERROR 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.

TROUBLESHOOTING

7-1. 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.

7-2. 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

Indoor Unit’s Refrigerant address

CC

TEMP button

DD

IC : Indoor unit
OC : Outdoor unit

EE

Check code

FF

Indoor Unit No.

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)

22

• Refer to the installation manual that comes with each remote controller for details.

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

On the IR 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.)

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.)

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

[Output pattern A] Errors detected by indoor unit

IR 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

RF thermostat

Check code

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

IR wireless remote controller

Beeper sounds/OPERATION

INDICATOR lamp flashes

(Number of times)

1

2

3

4

5

6

7

8

9
10

11

12

Wired remote controller

RF thermostat

Check code

E9
UP
U3, U4
UF
U2
U1, Ud
U5
U8
U6
U7

U9, UH

–
13
14

–

Others

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 IR 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.

Symptom Remark

• RF thermostat is not established.

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

7-3. SELF-DIAGNOSIS ACTION TABLE

Error Code

P1

P2

Abnormal point and detection method

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˚C[194˚F] or more
Open: -40˚C[-40˚F] or less

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˚C[194˚F] or more
Open: -40˚C[-40˚F] or less

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

such as F, U, and other E.

Cause

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 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˚C[194˚F] or more or

-40˚C[-40˚F] or less.

5 Defective indoor controller board

Countermeasure

1–3 Check resistance value of thermistor.

:[32˚F].......15.0k"

0

10:[50˚F].....9.6k"

20:[68˚F].....6.3k"

30:[86˚F].....4.3k"

40:[104˚F]...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 7-5.
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.

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 7-5. 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.

P4

(5701)

P5

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.

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 Contact failure of connector

(Insert failure)

2 Defective indoor controller

board

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

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

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.

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 shor t-

circuited between
switch connector CN4F and abnormality
reappears.

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

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

3-4 of the drain float

1~4

25

Error Code

P6

Abnormal point and detection method

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

:[5˚F] for three minutes after the

-15
compressor started. Abnormal if it stays
under -15
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
compressor started. Abnormal if the
temperature of over 70
detected again within 10 minutes after
six-minute resume prevention mode.

:[5˚F] for three minutes again

:[158˚F] after the

:[158˚F] is

Cause

(Cooling or drying mode)

1 Clogged filter (reduced airflow)
2 Shor t 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.

Countermeasure

(Cooling or drying mode)

1 Check clogging of the filter.
2 Remove shields.

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

INDOOR CONTROLLER BOARD)

P8

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˚C(-5.4deg˚F) ] (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 defrost­ing mode is over)

Heating range :

3 deg˚C(5.4deg˚F) [ (TH5-TH1)

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

(clogs)

8 Bypass circuit of outdoor unit

is defective.

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.

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

circuit.

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.

Conduct temperature check with outdoor
controller circuit board after connecting

(

‘A-Control Service Tool(PAC-SK52ST)’.

23Check converse connection of extension

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

)

26

Error Code

P9

Abnormal point and detection method

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˚C[194˚F] or more
Open: -40˚C[-40˚F] or less

Cause

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:[194˚F] or more or

-40˚C[-40˚F] or less caused by
defective refrigerant circuit.

5 Defective indoor controller

board

Countermeasure

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 7-5.
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.

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

E0

or

E4

E3

or

E5

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)

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 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.

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.

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.

27

Error Code

E6

E7

Fb

E1

or

E2

Abnormal point and detection method

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.

Indoor/outdoor unit communication
error (Transmitting error)

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

Indoor controller board

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

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)

Cause

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.

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 Defective indoor controller

board

1 Defective remote controller 1 Replace remote controller.

∗ Check LED display on the outdoor control cir-

cuit board. (Connect A-control service tool,
PA C-SK52ST.)
Refer to Outdoor manual.

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.

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

If abnormality generates again, replace
indoor controller board.

1 Replace indoor controller board.

Countermeasure

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[14˚F] 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

7-4. TROUBLESHOOTING BY INFERIOR PHENOMENA

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

controller.

Phenomena

(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 208~230V is not supplied to indoor

unit.

4 Defective indoor controller board

Cause

Countermeasure

1 Check the voltage of outdoor power

supply terminal block (L, N) or (L3, N).

• When AC 208~230V is not detected.
Check the power wiring to outdoor unit
and the breaker.

• When AC 208~230V is detected.

—Check 2 (below).

2 Check the voltage between outdoor

terminal block S1 and S2.

• When AC 208~230V is not detected.

Check the fuse on outdoor controller
circuit board.

Check the wiring connection.

• When AC 208~230V is detected.

—Check 3 (below).

3 Check the voltage between indoor terminal

block S1 and S2.

• When AC 208~230V is not detected.
Check indoor/outdoor unit connecting
wire for mis-wiring.

• When AC 208~230V 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

7-5. TEST POINT DIAGRAM

CN01 Power supply voltage (208 - 230VAC)

SWE Emergency operation

SW1 Model selection

SW2 Capacity setting

CN32 Remote start/stop adapter

CN24 Heater control (12VDC)

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: 294 - 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

CN4Y For Fan control

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

CN4Y

SWE

CN2L

C626

PC672

SW2

CN41

CN22

SW1

CN32

CN24

CN51

CN01

C955

7-5-1. Indoor controller board

SEZ-KD09NA
SEZ-KD12NA
SEZ-KD15NA
SEZ-KD18NA

30

SEZ-KD09NA4

CN01 Power supply voltage (208 - 230VAC)

SWE Emergency operation

SW1 Model selection

SW2 Capacity setting

CN105 Radio frequency interface

CN32 Remote start/stop adapter

CN24 Heater control (12VDC)

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: 294 - 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

CN4Y For Fan control

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

CN4Y

CN105

SWE

CN2L

C626

PC672

SW2

CN41

CN22

SW1

CN32

CN24

CN51

CN01

C955

SEZ-KD12NA4
SEZ-KD15NA4
SEZ-KD18NA4

31

7-6. TROUBLE CRITERION OF MAIN PARTS

Room temperature
thermistor
(TH1)

Condenser/evaporator
temperature thermistor
(TH5)

Measure the resistance with a tester.
(Part temperature 10°C(50°F) ~ 30°C(86°F))

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

SEZ-KD09NA(4)
SEZ-KD12NA(4)
SEZ-KD15NA(4)
SEZ-KD18NA(4)

32

7-7. 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 DC294~340V

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)

33

(A)

(B),(C)

DISASSEMBLY PROCEDURE8

SEZ-KD09NA(4)
SEZ-KD12NA(4)
SEZ-KD15NA(4)
SEZ-KD18NA(4)

1. Control box

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

to remove it.

Exercise caution when removing heavy parts.

Fig. 1

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.

Fig. 2

Fig. 3

34

3. Drainpan

(D) (E)

(a)

(a)

(a)

(a)

(a) Tab

Insulation material

(E)

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.

Exercise caution when removing heavy parts.

Fig. 4

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
Fig. 6.

Fig. 5

Fig. 6

35

4. Thermistor (Condenser / evaporator)

(F)

(G),(H)

(Liquid pipe)

1. Remove the drain pan according to the proce­dure 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: ø3/8inch(ø8mm)
Condenser / evaporator: ø1/4inch(ø6mm)

Exercise caution when removing heavy parts.

Fig. 7

Fig. 8

36

(a)

(a) Tab

5. Fan and fan motor

(J)

(a)

(a) Tab

(a)

(a)

(a)

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.

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

it in the direction of arrow 2.

Exercise caution when removing heavy parts.

Fig. 9

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.

(2) Remove the four fan case fixing screws to

take the top half of the fan casing off.

Fig. 10

Fig. 11

Fig. 12

37

(K)

6. Bearing [KD15·18NA(4) model only]

(L)

(M)

1. Removing the bearing

(1) Remove the two fixing screws on the bearing

cover (K) to remove it.

(2) Remove the two bearing retainer screws to

remove the bearing.

Exercise caution when removing heavy parts.

Fig. 13

Fig. 14

7. Heat exchanger

1. Remove the drain pan according to the proce­dure 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.

Fig. 15

Fig. 16

38

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New publication effective Apr. 2012

Specifications subject to change without notice