Mitsubishi SEZ-A12AR.TH, SEZ-A18AR.TH, SEZ-A24AR.TH Service Manual
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
ON/OFF
CENTRALLY CONTROLLED
ERROR CODE
CLOCK
ON OFF
˚C
CHECK
CHECK MODE
FILTER
TEST RUN
FUNCTION
˚C
1Hr.
NOT AVAILABLE
STAND BY
DEFROST
TEMP.
TECHNICAL & SERVICE MANUAL
No. OC303
Series SEZ
Ceiling Concealed
R410A
Indoor unit
[Model names] [Service Ref.]
SEZ-A12AR SEZ-A12AR.TH
SEZ-A18AR SEZ-A18AR.TH
SEZ-A24AR SEZ-A24AR.TH
•This manual does not cover
the following outdoor units.
When servicing them,
please refer to the service
manual No.OC304 and this
manual in a set.
CONTENTS
1. PART NAMES AND FUNCTIONS········2
2. SPECIFICATIONS·································4
3. OUTLINES AND DIMENSIONS············7
Model name
indication
4. WIRING DIAGRAM ·······························8
5.
REFRIGERANT SYSTEM DIAGRAM
········9
6. TROUBLESHOOTING························10
7. DISASSEMBLY PROCEDURE ···········17
INDOOR UNIT
8. PARTS LIST········································20
9. OPTIONAL PARTS·····························22
WIRED REMOTE
CONTROLLER
1
Air outlet duct flange
Air outlet
Air inlet
(Selecting the either back side or bottom side)
PAR-20MAA
ON/OFF
CENTRALLY CONTROLLED
ERROR CODE
CLOCK
ON OFF
˚C
CHECK
CHECK MODE
FILTER
TEST RUN
FUNCTION
˚C
1Hr.
NOT AVAILABLE
STAND BY
DEFROST
FILTER
CHECK TEST
TEMP.
TIMER SET
This sets the ventilation fan speed.
VENTILATION button
Press this button to switch the cooling,
electronic dry (dehumidify), automatic
and heating modes.
OPERATION SWITCH button
This sets the room temperature. The
temperature setting can be performed
in 1: units
Setting range
Cooling 19: to 30:
Heating 17: to 28:
TEMP. ADJUSTMENT button
This switches between continuous
operation and the timer operation.
TIMER button
This switches between the operation
and stop modes each time it is pressed.
The lamp on this button lights during
operation.
ON/OFF button
Only press this button to perform an
inspection check or test operation.
Do not use it for normal operation.
CHECK-TEST RUN button
This switch the horizontal fan motion
ON and OFF.
LOUVER button
AIR DIRECTION button
This resets the filter service indication
display
FILTER button
This sets the current time, start time
and stop time.
TIME SETTING button
This sets the ventilation fan speed.
FAN SPEED button
(Not available for this model.)
(Not available for this model.)
This adjusts the vertical angle of the
ventilation.
(Not available for this model.)
PART NAMES AND FUNCTIONS
Indoor Unit
SEZ-A12AR.TH
SEZ-A18AR.TH
SEZ-A24AR.TH
Wired remote controller
On the controls are set, the same operation mode can be repeated by simply pressing the ON/OFF button.
● Operation buttons
2
● Display
PAR-20MAA
ON/OFF
CENTRALLY CONTROLLED
ERROR CODE
CLOCK
ON OFF
˚C
CHECK
CHECK MODE
FILTER
TEST RUN
FUNCTION
˚C
1Hr.
NOT AVAILABLE
STAND BY
DEFROST
FILTER
CHECK TEST
TEMP.
TIMER SET
CENTRALLY
CONTROLLED display
This indicates when the unit is con-
trolled by optional features such as
central control type remote controller.
TIMER display
This indicates when the continuous
operation and time operation modes
are set.
It also display the time for the timer
operation at the same time as when
it is set.
OPERATION MODE display
This indicates the operation mode.
STANDBY display
The [STANDBY] symbol is only dis-
played from the time the heating
operation starts unit the heated air
begins to blow.
DEFROST display
This indicates when the defrost oper-
ation is performed.
CLOCK display
The current time , start time and stop
time can be displayed in ten second
intervals by pressing the time switch
button. The start time or stop time is
always displayed during the timer
operation.
In this display example on the bottom left, a condition where all display lamps light is shown for explanation purposes although this differs
from actual operation.
AIR DIRECTION display
This displays the air direction.
(Not available for this model.)
AIR SPEED display
The selected fan speed is displayed.
ROOM TEMPERATURE display
The temperature of the suction air
is displayed during operation. The
display range is 8°C to 39°C. The
display flashes 8°C when the actual
temperature is less than 8°C and
flashes 39°C when the actual temperature is greater than 39°C.
Operation lamp
This lamp lights during operation,
goes off when the unit stops and
flashes when a malfunction occurs.
This display lights in the check mode
or when a test operation is performed.
CHECK MODE
TEST RUN
display
FILTER display
CHECK display
This indicates when a malfunction
has occurred in the unit which should
be checked.
SET TEMPERATURE display
This displays the selected setting
temperature.
Caution
● Only the Power display lights when the unit is stopped and power supplied to the unit.
● When the central control remote control unit, which is sold separately, is used the ON-OFF button, operation switch button
and TEMP. adjustment button do not operate.
● “NOT AVAILABLE” is displayed when the Air speed button are pressed.This indicates that this room unit is not equipped
with the fan direction adjustment function and the louver function.
● When power is turned ON for the first time, it is normal that “H0” is displayed on the room temperature indication (For max.
2minutes). Please wait until this “H0” indication disappear then start the operation.
POWER display
This lamp lights when electricity is
supplied to the unit.
This lamp lights when the filter need
to be cleaned.
3
2
SEZ-A12AR.TH SEZ-A18AR.TH
Indoor model
Function
Power supply
Single phase
230V, 50Hz
780/600
10
0.21
33
—
0.21
PK6V19-EF
1100o270o700
33.5
1
35/30
770/630
3
10
10
10
PAR-20MAA
Cooling
94
Heating
95
Single phase
230V, 50Hz
1020/720
20
0.27
49
—
0.27
PK6V32-EF
1100o270o700
33.5
1
39/31
840/640
3
10
10
10
PAR-20MAA
Cooling
97
Heating
98
Air flow (High/Low)
Power outlet
Running current ✽1
Power input Rated frequency
Auxiliary heater
Power factor ✽1
Fan motor current ✽1
Model
Winding
resistance (at20:)
Dimensions WoHoD
Weight
Air direction
Sound level (High/Low)
Fan speed (High/Low)
Fan speed regulator
Thermistor RT11 (at 25:)
Thermistor RT12 (at 25:)
Thermistor RT13 (at 25:)
Remote controller model
K /h
A
A
W
A(kW)
%
A
"
mm
kg
dB(A)
rpm
k"
k"
k"
Electrical
data
Fan
motor
Special remarks
Capacity
WHT-BLK : 251.4 BLK-BLU : 19.9
BLU-YLW : 26.5 YLW-BRN : 13.2
BRN-RED : 50.0
WHT-BLK : 161.9 BLK-BLU : 50.3
BLU-YLW : 18.7 YLW-BRN : 8.0
BRN-RED : 39.2
SEZ-A12/18AR.TH : 2.5+ 440V SEZ-A24AR.TH : 3.0+ 440V
250V 3.15A
ERZV10D471
POWER SUPPLY : 3P TO OUTDOOR UNIT : 4P
G4A-1A-E-PS 12V DC
145:i2:
INDOOR UNIT
Item
Model
Indoor fan capacitor
Fuse
Varistor
Terminal block
Contactor
Indoor fan motor thermal fuse
SEZ-A12AR.TH SEZ-A18AR.TH SEZ-A24AR.TH
(C1)
(FUSE)
(ZNR1)
(TB)
(52C)
SPECIFICATIONS
NOTE : Test conditions are based on ISO 5151
Cooling : Indoor D.B. 27: W.B. 19:
Outdoor D.B. 35: W.B. 24:
Heating : Indoor D.B. 20: W.B. 5:
Outdoor D.B. 7: W.B. 6:
Refrigerant piping length (one way): 5m
✽1 Measured under rated operating frequency.
Specifications and rating conditions of main electric parts
4
Indoor model
SEZ-A24AR.TH
Function
Power supply
Capacity
NOTE : Test conditions are based on ISO 5151
Air flow (High/Low)
Power outlet
Running current ✽1
Power input Rated frequency
Auxiliary heater
Electrical
data
Power factor ✽1
Fan motor current ✽1
Model
Winding
Fan
motor
resistance (at20:)
Dimensions WoHoD
Weight
Air direction
Sound level(High/Low)
Fan speed(High/Low)
Fan speed regulator
Thermistor RT11 (at 25:)
Thermistor RT12 (at 25:)
Special remarks
Thermistor RT13 (at 25:)
Remote controller model
Cooling : Indoor D.B. 27: W.B. 19:
Outdoor D.B. 35: W.B. 24:
Heating : Indoor D.B. 20: W.B. 15:
Outdoor D.B. 7: W.B. 6:
Refrigerant piping length (one way): 5m
✽1 Measured under rated operating frequency.
K /h
A
A
W
A(kW)
%
A
"
mm
kg
dB(A)
rpm
k"
k"
k"
WHT-BLK : 101.1 BLK-BLU : 56.1
BLU-YLW : 14.7 YLW-BRN : 6.7
BRN-RED : 28.2
Cooling
98
Heating
Single phase
230V, 50Hz
1200/720
20
0.34
64
—
98
0.34
PK6V50-EF
1100o270o700
33.5
1
43/32
890/660
3
10
10
10
PAR-20MAA
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-A18AR.TH
Hi
Lo
39
SPL(dB)
31
LINE
<50Hz>
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-A12AR.TH
Hi
Lo
35
SPL(dB)
30
LINE
<50Hz>
NOTCH
NOISE CRITERION CURVES
UNIT
External static
pressure 30Pa
1.5m
MICROPHONE
90
80
70
60
50
40
30
20
10
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
TERESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
SEZ-A24AR.TH
Hi
Lo
43
SPL(dB)
32
LINE
<50Hz>
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.
6
3
42 930
Terminal
block
3/8F
flared connection
[9.52mm
[6.35mm
flared connection
1/4F
SEZ-A24AR
SEZ-A18AR
Air outlet
duct flange
Air outlet duct flange
51
25
930
(Inlet size)
PLATE (B) o2
After installation, remove the
transportation support PLATE (B).
PLATE (A)
In case of bottom side suction,
mount the PLATE (A) on the rear side.
39
955
7
o100=700
100
77.5
(Inlet size)
215
Air inlet (bottom side) dimensions
w Select the either
back side or bottom side.
Air inlet (rear side) dimensions
w Select the either back side or bottom side.
29
955
7
o100=70010077.5
240
120
12.5
25
(Inlet size)
(Inlet size)
Air inlet
(bottom side)
24-[2.9 holes
24-[2.9 holes
215
120
12.5 240
450
1/4F
flared connection
[6.35mm
(It is necessary to
maintain a working
service area from
the ceiling.)
150
(10) 50
Electrical parts box
2o2-[2.9
holes
50 880
7
o100=700
100
40
9o2-[2.9 holes
100 32.5
75 170 25
(10) 50
flared connection
[15.88mm
5/8F
flared connection
1/2F
[12.7mm
Refrigerent pipe
(gas)
Refrigerent pipe
(liquid)
1/4F
flared connection
[6.35mm
SEZ-A12AR
Models
1000
50
50
27
1016
77
150
600
Air inlet
(rear side)
Electrical parts box
700
Access door
Service space
Air outlet
38
60
680
350
Suspension bolt pitch
Suspension bolt pitch
1070
Suspension bolt
M10 or 3/8
(procure locally)
(Suspension bolt pitch)
Electrical parts box
(1070)
1100
20 or more
270
30
Access door
Wiring entry
Refrigerent pipe (liquid)
Refrigerent pipe (gas)
Drain plug R1 male
108
20
94 80
25
350
OUTLINES AND DIMENSIONS
SEZ-A12AR.TH
SEZ-A18AR.TH
SEZ-A24AR.TH
Unit : mm
7
4
FOR A18/24 (1:1 SYSTEM)
OR MULTI SYSTEM
FOR A12
(1:1 SYSTEM)
X5
X4
X2
REMOTE CONTROLLER
BOARD
R.B
RT12
RT11
I.B
RT13
FUSE
X4
X2
ZNR1
52C
4
3
w
TRANS
DC13.1V
BLK
C1
MF
X5
N
w BLU
CIRCUIT BREAKER
TB
GRN/YLW
N
w WHT
GRN/YLW
w BLU
TO OUTDOOR
UNIT
CONNECTING
w RED
L
12VDC
220-240V~
2
N
3
w WHT
TB
POWER SUPPLY
~/N
220-240V 220V
50Hz 60Hz
2
TO OUTDOOR
UNIT
CONNECTING
12V DC
3
[LEGEND]
INDOOR CONTROLLER
BOARD
I.B
52C
COMPRESSOR CONTACTOR
RELAY(FAN MOTOR)
X2,X4,X5
NAME
SYMBOL
NAME
SYMBOL
VARISTOR
ZNR1
FUSE(3.15A)
FUSE
MF
FAN MOTOR
ROOM TEMPERATURE
THERMISTOR
RT11
RT12
PIPE TEMPERATURE
THERMISTOR / LIQUID
C1
FAN MOTOR CAPACITOR
TERMINAL BLOCK
TB
RT13
CONDENSER / EVAPORATOR
TEMPERATURE THERMISTOR
1.Since the indoor fan motor(MF) is connected with 50Hz power,if 60Hz power is used, change the wiring
connection showing fig: *1
Indoor Fan Motor(MF) for 60Hz
2.About the outdoor side electric wiring refer to the outdoor unit electlic wiring diagram for servicing.
3.Use copper conductors only. (For field wiring)
4.Symbols below indicate.
: Terminal block : Connector
How to remove the terminals shown at " w " mark.
sleeve
1Slide the sleeve.
2Pull the wire while pushing the locking lever.
locking lever
" w " shows the terminals with a lock mechanism, so they cannot be removed when you pull the lead wire.
Be sure to pull the wire by pushing the locking lever (projected part) of the terminal with a finger.
NOTES:
60
BLUE
YELLOW
50
fig: *1
BLUE
BLU
TRANSMISSION WIRE
DC12V
2
1
TB
CN2
R.B
1
BLU
BLU
2
TB
(REMOCON)
BLU
CN22
21
2
2
1
1
(LIQUID)
(INTAKE)
CN21
CN20
RED
WHT
CN29
BLK
2
1
(2 PHASE)
FAN1
FAN2(FAN)
RED
CND(POWER)
(FAN)
5
3
1
7
5
3
1
WHT
WHT
BLU
YLW
1
3
5
WHT
BRN
RED
ORN
★
★
★ The 12V DC is NOT always against the ground.
Terminal 3 has 12V DC against terminal N.
However, between 3 and 2, these terminals are
NOT electrically insulated by the transformer or
other device.
WIRING DIAGRAM
SEZ-A12AR.TH
SEZ-A18AR.TH
SEZ-A24AR.TH
8
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