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