Mitsubishi Electric SEZ-KD12NA4 Operating manual

TECHNICAL & SERVICE MANUAL
CONTENTS
1. PART NAMES AND FUNCTIONS ········2
2. SPECIFICATIONS·································3
3. OUTLINES AND DIMENSIONS··········13
4. WIRING DIAGRAM ·····························14
5.
REFRIGERANT SYSTEM DIAGRAM ·······15
6. HEATER CONTROL ···························16
7. TROUBLESHOOTING·························19
8. DISASSEMBLY PROCEDURE ···········30
INDOOR UNIT
Indoor unit
[Model names] [Service Ref.]
SEZ-KD09NA4 SEZ-KD09NA4.TH
SEZ-KD12NA4 SEZ-KD12NA4.TH
SEZ-KD15NA4 SEZ-KD15NA4.TH
SEZ-KD18NA4 SEZ-KD18NA4.TH
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
Model name
indication
No.HWE0802A
REVISED EDITION-B
December 2010
CM
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2
1PART NAMES AND FUNCTIONS
Indoor Unit
SEZ-KD09NA4.TH
SEZ-KD12NA4.TH
SEZ-KD15NA4.TH
SEZ-KD18NA4.TH
Air outlet duct flange
Air outlet
Air inlet

3
2SPECIFICATIONS
BTU/h
kW
A
˚F(˚C)
Fan
in.WG(Pa)
kW
m3/min
CFM
L/S
mm
In.
kg
in.(mm)
A
Liquid in.(mm)
Gas in.(mm)
in.(mm)
dB<A>
Net weight
R410A
Motor output
Airflow rate(Low-Mid-High)
Airflow rate(Low-Mid-High)
Airflow rate(Low-Mid-High)
Motor type
External finish
Wiring
Capacity
Model Name
Power source
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:80˚FD.B. / 67˚FW.B. (26.7˚CD.B. / 19.4˚CW.B.) Outdoor:95˚FD.B. (35˚CD.B.)
Insulation material
Air filter
Refrigerant control device
Protection devices
Note
Pipe length:24-9/16ft (7.5m) Height difference:0ft (0m)
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
<Heating> Indoor:70˚FD.B. (21.1˚CD.B.) Outdoor:47˚FD.B. / 43˚FW.B. (8.3˚CD.B. / 6.1˚CW.B.)
1.Cooling/Heating capacity indicates the maximum value at operation under the following condition.
Refrigerant
piping diameter R410A
Sound level (Low-Mid-High)
(measured in anechoic room)
Heat exchanger
Terminal block
Power outlet A
Accessory
Min.size of wire
Amperage of wire breaker
Cooling
9000
0.06
0.50
67 to 86 (19 to 30)
Heating
10900
0.04
0.39
63 to 83 (17 to 28)
208/230V (60Hz)
-
Sirocco fan x 2
0.02-0.06-0.14-0.20 (5-15-35-50)
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
7-7/8 x 31-1/8 x 27-9/16
19
1/8 (1.6)
15
ø1/4 (ø6.35) Flare
ø3/8 (ø9.52) Flare
O.D. 1-1/4 (32)
23-26-30
Polystyrene foam, Polyethylene foam, Urethane foam
PP Honeycomb fabric (washable)
-
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)
SEZ-KD09NA4
Cooling
12000
0.07
0.57
67 to 86 (19 to 30)
Heating
13600
0.05
0.46
63 to 83 (17 to 28)
208/230V (60Hz)
-
Sirocco fan x 2
0.02-0.06-0.14-0.20 (5-15-35-50)
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
22
1/8 (1.6)
15
ø1/4 (ø6.35) Flare
ø3/8 (ø9.52) Flare
O.D. 1-1/4 (32)
23-28-33
Polystyrene foam, Polyethylene foam, Urethane foam
PP Honeycomb fabric (washable)
-
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)
SEZ-KD12NA4

4
3.Cooling capacity value at 1:1system
Heating capacity value at 1:1system
BTU/h
kW
A
˚F(˚C)
Fan
in.WG(Pa)
kW
m3/min
CFM
L/S
mm
In.
kg
in.(mm)
A
Liquid in.(mm)
Gas in.(mm)
in.(mm)
dB<A>
Net weight
R410A
Motor output
Airflow rate(Low-Mid-High)
Airflow rate(Low-Mid-High)
Airflow rate(Low-Mid-High)
Motor type
External finish
Wiring
Capacity
Model Name
Power source
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:80˚FD.B. / 67˚FW.B. (26.7˚CD.B. / 19.4˚CW.B.) Outdoor:95˚FD.B. (35˚CD.B.)
Insulation material
Air filter
Refrigerant control device
Protection devices
Note
Pipe length:24-9/16ft (7.5m) Height difference:0ft (0m)
2.Power consumption. Run current at 0.06[in.WG] (15Pa) (external static pressure)
<Heating> Indoor:70˚FD.B. (21.1˚CD.B.) Outdoor:47˚FD.B. / 43˚FW.B. (8.3˚CD.B. / 6.1˚CW.B.)
1.Cooling/Heating capacity indicates the maximum value at operation under the following condition.
Refrigerant
piping diameter R410A
Sound 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
15000
0.09
0.74
67 to 86 (19 to 30)
Heating
18000
0.07
0.63
63 to 83 (17 to 28)
208/230V (60Hz)
-
Sirocco fan x 3
0.02-0.06-0.14-0.20 (5-15-35-50)
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
24
1/8 (1.6)
15
ø1/4 (ø6.35) Flare
ø1/2 (ø12.7) Flare
O.D. 1-1/4 (32)
30-34-37
Polystyrene foam, Polyethylene foam, Urethane foam
PP Honeycomb fabric (washable)
-
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)
SEZ-KD15NA4
Cooling
17200
0.09
0.74
67 to 86 (19 to 30)
Heating
21600
0.07
0.63
63 to 83 (17 to 28)
208/230V (60Hz)
-
Sirocco fan x 4
0.02-0.06-0.14-0.20 (5-15-35-50)
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
7-7/8 x 46-7/8 x 27-9/16
28
1/8 (1.6)
15
ø1/4 (ø6.35) Flare
ø1/2 (ø12.7) Flare
O.D. 1-1/4 (32)
30-34-38
Polystyrene foam, Polyethylene foam, Urethane foam
PP Honeycomb fabric (washable)
-
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)
SEZ-KD18NA4

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-KD09NA4.TH
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-KD09NA4.TH
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-KD09NA4.TH
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-KD09NA4.TH
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
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-KD12NA4.TH
External static pressure:
0.06[in.WG](15Pa)
High
Middle
33
SPL(dB)
28
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-KD12NA4.TH
External static pressure:
0.02[in.WG](5Pa)
High
Middle
33
SPL(dB)
28
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-KD12NA4.TH
External static pressure:
0.20[in.WG](50Pa)
High
Middle
35
SPL(dB)
31
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-KD12NA4.TH
External static pressure:
0.14[in.WG](35Pa)
High
Middle
34
SPL(dB)
29
Low 24
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.

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-KD15NA4.TH
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-KD15NA4.TH
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-KD15NA4.TH
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-KD15NA4.TH
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
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-KD18NA4.TH
External static pressure:
0.06[in.WG](15Pa)
High
Middle
38
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-KD18NA4.TH
External static pressure:
0.02[in.WG](5Pa)
High
Middle
37
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-KD18NA4.TH
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-KD18NA4.TH
External static pressure:
0.14[in.WG](35Pa)
High
Middle
39
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.

9
INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW
SEZ-KD09NA4
(External static pressure 0.06[in.WG](15Pa)) 208/230V 60Hz
0
10
20
30
40
50
45678910
Airflow rate(m3/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(m3/min)[CFM]
External static pressure [in.WG](Pa)
SEZ-KD09NA4
(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(m3/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-KD09NA4
(External static pressure 0.20[in.WG](50Pa)) 208/230V 60Hz
45678910
Airflow rate(m3/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-KD09NA4
(External static pressure 0.14[in.WG](35Pa)) 208/230V 60Hz
45678910
Airflow rate(m3/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-KD12NA4
(External static pressure 0.06[in.WG](15Pa)) 208/230V 60Hz
6789101112
0
10
20
30
40
50
External static pressure [in.WG](Pa)
[0.20]
[0.16]
[0.12]
[0.08]
[0.04]
Airflow rate(m3/min)[CFM]
[212] [282][247] [353] [388][318] [424]
Middle
Low
High
Limit
Rated point
6789101112
SEZ-KD12NA4
(External static pressure 0.02[in.WG](5Pa)) 208/230V 60Hz
0
40
30
20
10
External static pressure [in.WG](Pa)
[0.16]
[0.12]
[0.08]
[0.04]
Airflow rate(m3/min)[CFM]
[212] [282][247] [353] [388][318] [424]
Middle
Low
High
Limit
Rated point
0
20
10
30
40
50
60
70
80
SEZ-KD12NA4
(External static pressure 0.20[in.WG](50Pa)) 208/230V 60Hz
6789101112
External static pressure [in.WG](Pa)
[0.32]
[0.28]
[0.24]
[0.20]
[0.16]
[0.12]
[0.08]
[0.04]
Airflow rate(m3/min)[CFM]
[212] [282][247] [353] [388][318] [424]
Middle
Low
High
Limit
Rated point
0
20
10
30
40
50
60
70
80
SEZ-KD12NA4
(External static pressure 0.14[in.WG](35Pa)) 208/230V 60Hz
6789101112
External static pressure [in.WG](Pa)
[0.32]
[0.28]
[0.24]
[0.20]
[0.16]
[0.12]
[0.08]
[0.04]
Airflow rate(m3/min)[CFM]
[212] [282][247] [353] [388][318] [424]
Middle
Low
High
Limit
Rated point

11
SEZ-KD15NA4
(External static pressure 0.06[in.WG](15Pa)) 208/230V 60Hz
8 9 10 11 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(m3/min)[CFM]
[282] [318] [353] [388] [424] [494][459] [530] [565]
High
Limit
Rated point
Middle
Low
SEZ-KD15NA4
(External static pressure 0.02[in.WG](5Pa)) 208/230V 60Hz
Airflow rate(m3/min)[CFM]
8 9 10 11 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-KD15NA4
(External static pressure 0.20[in.WG](50Pa)) 208/230V 60Hz
8 9 10 11 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(m3/min)[CFM]
[282] [318] [353] [388] [424] [494][459] [530] [565]
Middle
Low
High
Limit
Rated point
SEZ-KD15NA4
(External static pressure 0.14[in.WG](35Pa)) 208/230V 60Hz
8 9 10 11 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(m3/min)[CFM]
[282] [318] [353] [388] [424] [494][459] [530] [565]
Middle
Low
High
Limit
Rated point

12
SEZ-KD18NA4
(External static pressure 0.06[in.WG](15Pa)) 208/230V 60Hz
9 10111213141516171819
0
10
20
30
40
50
External static pressure [in.WG](Pa)
[0.20]
[0.16]
[0.12]
[0.08]
[0.04]
[318] [353] [388] [424] [494][459] [530] [565] [600] [671][636]
Middle
Low
High
Limit
Rated point
Airflow rate(m3/min)[CFM]
SEZ-KD18NA4
(External static pressure 0.02[in.WG](5Pa)) 208/230V 60Hz
Airflow rate(m3/min)[CFM]
9 10111213141516171819
0
40
30
20
10
External static pressure [in.WG](Pa)
[0.16]
[0.12]
[0.08]
[0.04]
[318] [353] [388] [424] [494][459] [530] [565] [600] [671][636]
Middle
Low
High
Limit
Rated point
SEZ-KD18NA4
(External static pressure 0.20[in.WG](50Pa)) 208/230V 60Hz
9 10111213141516171819
0
10
20
30
40
60
70
50
80
External static pressure [in.WG](Pa)
[0.32]
[0.28]
[0.24]
[0.20]
[0.16]
[0.12]
[0.08]
[0.04]
[318] [353] [388] [424] [494][459] [530] [565] [600] [671][636]
Middle
Limit
Rated point
Low
High
Airflow rate(m3/min)[CFM]
SEZ-KD18NA4
(External static pressure 0.14[in.WG](35Pa)) 208/230V 60Hz
9 10111213141516171819
0
10
20
30
40
60
70
50
80
External static pressure [in.WG](Pa)
[0.32]
[0.28]
[0.24]
[0.20]
[0.16]
[0.12]
[0.08]
[0.04]
[318] [353] [388] [424] [494][459] [530] [565] [600] [671][636]
Airflow rate(m3/min)[CFM]
Middle
Limit
Rated point
Low
High

13
OUTLINES AND DIMENSIONS
3
Unit : mm(in.)
SEZ-KD09NA4.TH
SEZ-KD12NA4.TH
SEZ-KD15NA4.TH
SEZ-KD18NA4.TH
(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-KD15NA4
900 952 998 860 9800 1000 860 7700 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
1100
B
1152
SEZ-KD09NA4
SEZ-KD12NA4
SEZ-KD18NA4
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
12
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)
G450
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-KD15NA4 model,which has 3 fans.
SEZ-KD09,12NA4 models have 2 fans.
SEZ-KD18NA4 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)

14
4WIRING DIAGRAM
SEZ-KD09NA4.TH
SEZ-KD12NA4.TH
SEZ-KD15NA4.TH
SEZ-KD18NA4.TH
12
1~
M
ON
OFF
SW6
DC294-340V
RECTIFY CIRCUIT
RU
SW1
BZ1
SW2
LED1
CN1
W.B.
RFI
R.B.
12
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
12
(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 MODE SELECTION)
SWITCH (FOR MODEL SELECTION)
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

15
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)
SEZ-KD09NA4.TH
SEZ-KD12NA4.TH
SEZ-KD15NA4.TH
SEZ-KD18NA4.TH

16
6HEATER CONTROL
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.
Table.1 [Function table]
Select unit numbers 01 to 03 or all units (AL [wired remote controller] / 07 [IR 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 temp.-4.5
˚ F(2.5 ˚C )
Inlet air 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 temp.
Set temp.-1.8
˚ F(2.5 ˚C )
Inlet air temp.
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 to 2 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
-
-

17
The following section describes installation of the External Heater Adapter that connects to SEZ-KD NA4
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
Two 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
CN4Y for FAN control
(PAC-YU25HT)
<Image>
6-3. PAC-YU25HT (Optional Parts) installation
(3) Locally procured wiring
A basic connection method is shown below.
CN24
X
X
Remote control board Relay circuit Adapter
Indoor unit
control board
Electric Heater power source
Electric Heater
or panel
heater
Red 1
White 2
Preparations in the field Maximum cable length
is 10 m (32ft)
YellowWhite
White 1
(applicable only when a panel
heater is connected)
3
CN4Y

18
For relay X use the specifications given below Operation coil
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 mm2~ 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

19
7TROUBLESHOOTING
7-1. CAUTIONS ON TROUBLESHOOTING
(1) Before troubleshooting, check the followings:
1Check the power supply voltage.
2Check the indoor/outdoor connecting wire for mis-wiring.
(2) Take care the followings during servicing.
1Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn
off the breaker.
2When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the
components.
3When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Lead wires

20
7-2. SELF-CHECK FUNCTION
• Refer to the installation manual that comes with each remote controller for details.
• RF thermostat is not established.
• 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 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 min-
utes 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