Mitsubishi SLZ-A09AR.TH, SLZ-A12AR.TH, SLZ-A18AR.TH Service Manual
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
ON/OFF
RESET
TOO
WARM
TOO
COOL
MODE
AUTO COOL
DRY
HEAT
FAN
VANE
SELECT
TIME
h
TECHNICAL & SERVICE MANUAL
No. OC302
Series SLZ
Ceiling Cassettes
R410A
Indoor unit
[Model names] [Service Ref.]
SLZ-A09AR SLZ-A09AR.TH
SLZ-A12AR SLZ-A12AR.TH
SLZ-A18AR SLZ-A18AR.TH
•This manual does not cover
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·································3
3. OUTLINES AND DIMENSIONS············5
4. WIRING DIAGRAM ·······························7
5.
REFRIGERANT SYSTEM DIAGRAM
INDOOR UNIT
6. TROUBLESHOOTING ··························9
7. 4-WAY AIR FLOW SYSTEM ···············16
8. DISASSEMBLY PROCEDURE ···········18
9. PARTS LIST········································21
REMOTE CONTROLLER
·········8
1
ON/OFF
RESET
TOO
WARM
TOO
COOL
MODE
AUTO COOL
DRY
HEAT
FAN
VANE
SELECT
TIME
h
PART NAMES AND FUNCTIONS
Indoor Unit
SLZ-A09AR.TH
SLZ-A12AR.TH
SLZ-A18AR.TH
Horizontal Air Outlet
Sets airflow horizontal automatically
during cooling or dehumidifying.
Filter
Remove dust and pollutants
from inhaled air
Grille
Auto Air Swing Vane
Disperses airflow up and
down and adjusts the angle
of airflow direction.
Air Intake
Inhales air from room.
Remote controller
SET TEMPERATURE
button
SET TEMPERATURE
button sets and any
desired room temperature.
ON / OFF button
Pushing button starts
operation. Pushing again
stops operation.
MODE SELECT button
This button is used to change
between auto, cooling,
heating and drying operation
modes. (SLZ)
Attention :
● Avoid operation of buttons with fingernails or other sharp objects. Sharp objects may scratch remote controller.
TIMER SELECT button
Used for selecting timed
starting or stopping.
FAN SPEED button
This button is used to set
fan speed to low, medium
or high.
VANE CONTROL button
Used to change the airflow
direction.
2
2
SLZ-A09AR.TH SLZ-A12AR.TH
Indoor model
Function
Power supply
Single phase
230V, 50Hz
600/540/480
10
0.18
40
0.014
0.18
PK6V15-LA
4
38/35/32
650/580/530
3
10
10
10
MPPC
Cooling
91
Heating
92
Single phase
230V, 50Hz
660/600/540
10
0.23
52
0.014
0.23
PK6V20-LE
4
39/37/34
690/630/570
3
10
10
10
MPPC
Cooling
94
Heating
95
Air flow (High/Med./Low)
Power outlet
Running current ✽1
Power input Rated frequency
Dew prevention heater
Power factor ✽1
Fan motor current ✽1
Model
Winding
resistance (at20:)
Width
Height
Depth
Weight
Air direction
Sound level(High/Med./Low)
Fan speed(High/Med./Low)
Fan speed regulator
Thermistor RT11(at25:)
Thermistor RT12(at25:)
Thermistor RT13(at25:)
Remote controller model
K /h
A
A
W
(kW)
%
A
"
mm(in)
mm(in)
mm(in)
kg
dB(A)
rpm
k"
k"
k"
Electrical
data
Fan
motor
Special
remarks
Capacity
Dimensions
WHT-BLK : 407 BLK-BLU : 55
BLU-YLW : 31 YLW-BRN : 30
BRN-RED : 165
UNIT : 570(22-7/16) PANEL : 650(25-9/16)
UNIT : 208(8-3/16) PANEL : 20(13/16)
UNIT : 570(22-7/16) PANEL : 650(25-9/16)
UNIT : 16.5 PANEL : 3
WHT-BLK : 384 BLK-BLU : 111
BLU-YLW : 49 YLW-BRN : 46
BRN-RED : 311
SLZ-A18AR.TH
Single phase
230V, 50Hz
660/600/540
20
0.24
53
0.014
0.24
PK6V20-LF
4
40/38/35
710/650/590
3
10
10
10
MPPC
Cooling
97
Heating
97
WHT-BLK : 317 BLK-BLU : 88
BLU-YLW : 52 YLW-BRN : 45
BRN-RED : 301
1.5+ 440V
250V 3.15A
MSBPC20 12V 250"
POWER SUPPLY : 3P TO OUTDOOR UNIT : 4P
G4A-1A-E-PS 12V DC
145:i2:
240V AC 15W
INDOOR UNIT
Item
Model
Indoor fan capacitor
Fuse
Vane motor
Terminal block
Contactor
Indoor fan motor thermal fuse
Cord Heater
SLZ-A09AR.TH SLZ-A12AR.TH SLZ-A18AR.TH
(C1)
(F11)
(MV)
(TB)
(52C)
(H2)
SPECIFICATIONS
NOTE : Test conditions are based on ISO 5151
Cooling : Indoor D.B. 27: W.B. 19:
Heating : Indoor D.B. 20: W.B. 15:
Refrigerant piping length (one way): 5m
✽1 Measured under rated operating frequency.
Specifications and rating conditions of main electric parts
Outdoor D.B. 35: W.B. 24:
Outdoor D.B. 7: W.B. 6:
3
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
SLZ-A12AR.TH
Hi
Me
39
SPL(dB)37LINE
<50Hz>
NOTCH
Lo
34
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
SLZ-A09AR.TH
Hi
Me
38
SPL(dB)35LINE
<50Hz>
NOTCH
Lo
32
NOISE CRITERION CURVES
UNIT
1.5m
MICROPHONE
CEILING
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
SLZ-A18AR.TH
Hi
Me
40
SPL(dB)38LINE
<50Hz>
NOTCH
Lo
35
4
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.
3
Suspension bolt
M10 or 3/8
(procure locally)
1/4F
flared connection
[6.35mm
1/4F
flared connection
[6.35mm
[9.52mm
flared connection
3/8F
1/2F
flared connection
SLZ-A18AR
SLZ-A12AR
Refrigerent pipe (liquid)
Refrigerent pipe (gas)
Models
SLZ-A09AR
[6.35mm
flared connection
1/4F
Refrigerent pipe
(liquid)
Refrigerent pipe
(gas)
[12.7mm
[9.52mm
flared connection
3/8F
15~37 15~37
576~620
570
530
Grille
Fresh air
intake
Drain pipe
VP-25 connection
(O.D.[32)
Vane motor
Drain hole
V/M
V/M
V/M
V/M
Air intake grille
55 35
35 55
Auto vane
Grille
Air intake hole
Air intake hole
Air outlet hole
Air outlet hole
301
301
Emergency operation
switch(cooling)
Emergency operation switch(heating)
Operation lamp
(WIRELESS PANEL)
DEFROST/STAND BY lamp
Receiver
Detail drawing of fresh air intake
Ceiling surface
Cut out hole
[73.4
Burring hole
3-[2.8 hole
[100
118
25
120°
120°
377
377
650
650
Suspension
bolt lower edge
230
18248
Wiring entry
Terminal block
Ceiling surface
235
208
27
+5
0
193
20
93
38~58
66121
17 202
56
57
72
31
Ceiling hole
Suspension bolt pitch
15~37
15~37
576~620
420
570
335
199
352
335
Suspension bolt
pitch
Ceiling hole
OUTLINES AND DIMENSIONS
SLZ-A09AR.TH
SLZ-A12AR.TH
SLZ-A18AR.TH
Unit : mm
5
REMOTE CONTROLLER
Installation area
• Area in which the remote controller is not exposed direct sunshine.
• Area in which there is no nearby heating source.
• Area in which the remote controller is not exposed to cold (or hot) winds.
• Area in which the remote controller can be operated easily
• Area in which the remote controller is beyond the reach of children.
Installation method
1 Attach the remote controller holder to the desired location using two tapping screws.
2 Place the lower end of the controller into the holder.
A Wireless remote controller (Accessory)
B Wall
C Remote controller holder (Accessory)
D Fixing screw (Accessory)
• The signal can travel up to approximately 7 meters (in a straight line) within 45
degrees to both right and left of the center line of the receiver.
In addition, the signal may not be received if there is interference of light of fluorescent
lights or strong sunlight.
A
C
B
D
ON/OFF
RESET
TOO
WARM
TOO
COOL
MODE
AUTO COOL
DRY
HEAT
FAN
VANE
SELECT
TIME
h
57 17.5
140
Unit : mm
6
4
GRILLE
FOR A18 (1:1 SYSTEM)
OR MULTI SYSTEM
FOR A09/12
★
★
(1:1 SYSTEM)
TO OUTDOOR
UNIT
CONNECTING
CONDENSER/EVAPORATOR
TEMPERATURE THERMISTOR
RT13
RT13
3
12VDC
★ 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.
TO OUTDOOR
UNIT
CONNECTING
2
N
TB
TERMINAL BLOCK
MV MV MV MV
CNB
BZ
LED2
LED1
SW1
SW2
RU
W.B
POWER SUPPLY
~/N
220-240V 220V
50Hz 60Hz
FAN MOTOR
CAPACITOR
C1
5
5
5
5
H2
5
BLK
DC13.1V
TRANS
X5
X5
W.R
REMOTE
CONTROLLER
TB
: Connector
: Terminal block
(For field wiring)
2.Use copper conductors only.
3.Symbols below indicate.
PIPE TEMPERATURE
THERMISTOR / LIQUID
RT12
W.R
WIRELESS REMOTE
CONTROLLER
RT11
ROOM TEMPERATURE
THERMISTOR
VANE MOTORMV
FAN MOTOR
MF
DEW PREVENTION
HEATER
H2
DRAIN SENSOR
DRAIN-UP
MACHINE
DP
DS
FUSE
FUSE(3.15A)
w WHT
3
N
2
220-240V~
12VDC
L
3
4
52C
ZNR1
DP
MF
X1
X2
X3
X4
X4
X3
X2
X1
w RED
w BLU
GRN/YLW
w WHT
N
GRN/YLW
TB
CIRCUIT BREAKER
w BLU
1.About the outdoor side electric wiring refer to the outdoor unit electlic wiring diagram for servicing.
How to remove the terminals
shown at "
w " mark.
" 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.
locking lever
1 Slide the sleeve.
2 Pull the wire
while pushing
the locking lever.
sleeve
NOTES:
9
BUZZER
ZNR1
VARISTOR
NAME
SYMBOLSYMBOL
NAME
SYMBOL
NAME
X1
X2-X5
RELAY(D.PUMP
/D.HEATER)
RELAY
(FAN MOTOR)
COMPRESSOR
CONTACTOR
52C
BZ
LED1
LED2
SW1
SW2
I.B
INDOOR
CONTROLLER
BOARD
W.B
WIRELESS REMOTE
CONTROLLER
BOARD
RU
LED
(RUN INDICATOR)
LED
(HOT ADJUST)
SWITCH
(HEATING ON/OFF)
SWITCH
(COOLING ON/OFF)
RECEVING UNIT
[LEGEND]
FUSE
C1
I.B
RT11
RT12
DS
(2 PHASE)
1
2
BLK
CN29
1
3
1
3
BRN
RED
ORN
YLW
BLU
VLT
GRY
PINK
SKY BLU
YLW
YLW
RED
ORN
YLW
WHT
BLU
1
745
10
89
ORN
RED
BRN
YLW
BLU
WHT
YLW
YLW
BLU
RED
WHT
RED
GRN
WHT
WHT
1
3
5
7
1
3
1
3
5
5
3
1
CNP(PUMP)
CNC
CND(POWER)
RED
CN31
CN20
CN21
(DRAIN)
(INTAKE)
(LIQUID)
CN90
(WIRELESS)
CN6V
(VANE)
(HEATER)
1
2
3
1
1
2
2
12345
1
2
3
4
5
6
7
8
9
FAN2(FAN)
FAN1(FAN)
BLU
WHT
ORN
RED
YLW
6
WHT
WHT
SKY BLU
PINK
GRY
VLT
BLU
YLW
ORN
RED
BRN
YLW
YLW
236
123456789
w
WIRING DIAGRAM
SLZ-A09AR.TH
SLZ-A12AR.TH
SLZ-A18AR.TH
7
5
Pipe temperature
thermistor/liquid
(RT12)
Distributor
with strainer
#50
Condenser/evaporator
temperature thermistor
(RT13)
Room temperature
thermistor (RT11)
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
SLZ-A09AR.TH
SLZ-A12AR.TH
SLZ-A18AR.TH
8
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