Mitsubishi SLZ-KA25VA(L)(1), SLZ-KA35VA(L)(1), SLZ-KA50VA(L)(1) Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

ON/OFF

RESET

TOO

WARM

TOO
COOL

MODE

AUTO COOL

DRY

HEAT

FAN

VANE

SELECT

TIME

TECHNICAL & SERVICE MANUAL

Indoor unit
[Model names] [Service Ref.]

SLZ-KA25VA SLZ-KA25VA.TH

SLZ-KA25VA

SLZ-KA35VA SLZ-KA35VA.TH

SLZ-KA35VA

SLZ-KA50VA SLZ-KA50VA.TH

SLZ-KA50VA

SLZ-KA25VAL SLZ-KA25VAL.TH

SLZ-KA25VAL

SLZ-KA35VAL SLZ-KA35VAL.TH

SLZ-KA35VAL

SLZ-KA50VAL SLZ-KA50VAL.TH

SLZ-KA50VAL

1.TH

1.TH

1.TH

1.TH

1.TH

1.TH

July 2007

No. OC320

REVISED EDITION-B

Revision:

• SLZ-KA25/35/50VA(L)1.TH
are added in REVISED
EDITION-B.

• Some descriptions have
been modified.

•Please void OC320 REVISED

EDITION-A.

Note:

• This manual describes only

service data of the indoor

units. When servicing out­door units, please refer to
the service manual
No.OC322 or OC323
together with this manual.

• RoHS compliant products
have <G> mark on the spec
name plate.

• For servicing RoHS
compliant products, refer
to the RoHS Parts List.

CONTENTS

1. TECHNICAL CHANGES······················2

2. PART NAMES AND FUNCTIONS·······3

3. SPECIFICATIONS································6

4. OUTLINES AND DIMENSIONS ···········8

Model name
indication

SLZ-KA25,35,50VAL.TH

SLZ-KA25,35,50VAL1.TH

REMOTE CONTROLLER

INDOOR UNIT

SLZ-KA25,35,50VA.TH

SLZ-KA25,35,50VA1.TH

TEMP.

ON/OFF

5. WIRING DIAGRAM ····························11

6.

REFRIGERANT SYSTEM DIAGRAM

······12

7. TROUBLESHOOTING·······················13

8. 4-WAY AIR FLOW SYSTEM··············25

9. DISASSEMBLY PROCEDURE··········27

10. PARTS LIST·······································30

11. RoHS PARTS LIST ····························34

1

TECHNICAL CHANGES

SLZ-KA25VAL.TH ➔ SLZ-KA25VAL1.TH

SLZ-KA35VAL.TH ➔ SLZ-KA35VAL1.TH
SLZ-KA50VAL.TH ➔ SLZ-KA50VAL1.TH
SLZ-KA25VA.TH ➔ SLZ-KA25VA

1.TH

SLZ-KA35VA.TH ➔ SLZ-KA35VA1.TH
SLZ-KA50VA.TH ➔ SLZ-KA50VA1.TH

• PANEL has been changed.
SLP-2AL ➔ SLP-2ALW
SLP-2AA ➔ SLP-2AAW
(White : 0.70Y 8.59/0.97) ➔ (Pure white : 6.4Y 8.9/0.4)

2

2

Auto Air Swing Vane
Disperses airflow up and

down and adjusts the angle
of airflow direction.

Grille

Filter
Removes dust and pollutants

from inhaled air.

Horizontal Air Outlet
Sets horizontal airflow automatically

during cooling or dehumidifying.

Air Intake
Inhales air from room.

ON/OFF

RESET

TOO

WARM

TOO

COOL

MODE

AUTO COOL

DRY

HEAT

FAN

VANE

SELECT

TIME

h

ON / OFF button

To start and to stop operation.

VANE CONTROL button

To change the airflow
direction.

FAN SPEED button

To set fan speed to Low,
Medium or High.

TIMER SELECT button

To set time to start or stop
unit operation.

TEMPERATURE
SETTING button

To set any

desired room

temperature.

MODE SELECT button

To change the operation
mode; Auto, Cooling ,
Heating and Drying . (SLZ)

PART NAMES AND FUNCTIONS

Indoor Unit
SLZ-KA25VAL.TH SLZ-KA25VA.TH SLZ-KA25VAL1.TH SLZ-KA25VA1.TH
SLZ-KA35VAL.TH SLZ-KA35VA.TH SLZ-KA35VAL1.TH SLZ-KA35VA1.TH
SLZ-KA50VAL.TH SLZ-KA50VA.TH SLZ-KA50VAL1.TH SLZ-KA50VA1.TH

Wireless remote comtroller
SLZ-KA25VAL.TH
SLZ-KA35VAL.TH
SLZ-KA50VAL.TH
SLZ-KA25VAL1.TH
SLZ-KA35VAL1.TH
SLZ-KA50VAL1.TH

Attention:

• Avoid pushing buttons with fingernails and other sharp objects. Sharp objects may damage remote controller.

3

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

MENU

BACK DAY

MONITOR/SET

CLOCK

ON/OFF

Temperature setting 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
lid

ON/OFF button

Fan Speed button

Filter button
(<Enter> button)

Test Run button

Check button (Clear button)

Airflow Up/Down button

Louver button
( Operation button)

T o return operation
number

Ventilation button
( Operation button)

To go to next operation
number

Built-in temperature sensor

● Wired remote controller

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

SLZ-KA25VA.TH SLZ-KA25VA1.TH
SLZ-KA35VA.TH SLZ-KA35VA1.TH
SLZ-KA50VA.TH SLZ-KA50VA1.TH

4

● Wired remote controller

●

●

˚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

Note:

“PLEASE WAIT” message
This message is displayed for approximately 3 minutes when power is supplied to the indoor unit or when the unit is recovering from a power failure.
“NOT A V AILABLE” message
This message is displayed if an invalid button is pressed (to operate a function that the indoor unit does not have).
If a single remote controller is used to operate multiple indoor units simultaneously that are different types, this message will not be displayed as
far as any of the indoor units is equipped with the function.

Display Section

For purposes of this explanation,
all parts of the display are shown
as lit. During actual operation, only
the relevant items will be lit.

Identifies the current operation

Shows the operating mode, etc.
*Multilanguage display is available.

“Centrally Controlled” indicator

Indicates that operation from 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, unless the simple or Auto Off
timer is set.
If the simple or Auto Off timer is set, the time to be
switched off is shown.

“Sensor” indication

Displayed when the remote controller
sensor is used.

“Locked” indicator

Indicates that remote controller but­tons have been locked.

“Clean The Filter” indicator

To be displayed 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

Shows the direction of the
outcoming airflow.

“One Hour Only” indicator

Room Temperature display

Shows the room temperature. The room
temperature display range is 8~39:.
The display blinks if the temperature
is less than

8: or 39:

or more.

Louver display

Indicates the action of the swing louver.
Does not appear if the louver is not
running.

(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.

Displayed if the airflow is set to
low or downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off in one hour,
when the airflow direction also
changes.

5

3

SLZ-KA25VAL(1).TH

SLZ-KA25VA

(1).TH

SLZ-KA35VAL

(1).TH

SLZ-KA35VA

(1).TH

Indoor service ref.

Function

Power supply

Single phase

230V, 50Hz

600/540/480

10

0.35
75

0.014

0.19

PK6V15-LD

4

37/31/28

650/530/480

3
10
10
10

Cooling

90

Heating

93

Single phase

230V, 50Hz

660/540/480

10

0.40
85

0.014

0.26

PK6V20-LL

4

38/33/29

690/570/510

3
10
10
10

Cooling

94

Heating

94

Air flow

(High/Medium/Low)
Power outlet
Running current ✽1
Power input Rated frequency
Dew prevention heater
Power factor ✽1
Fan motor current ✽1
Model

Winding
resistance (at 26:)

Width
Height

Depth
Weight
Air direction
Sound level(High/Medium/Low)
Fan speed(High/Medium/Low)
Fan speed regulator
Thermistor TH1(at25:)
Thermistor TH2(at25:)
Thermistor TH5(at25:)

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 : 86
BLU-YLW : 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 : 393 BLK-BLU : 164
BLU-YLW : 47 BRN-RED : 319

SLZ-KA50VAL(1).TH

SLZ-KA50VA

(1).TH

Single phase

230V, 50Hz

660/540/480

20

0.65
85

0.014

0.27

PK6V20-LM

4

39/34/30

710/590/530

3
10
10
10

Cooling

97

Heating

97

WHT-BLK : 325 BLK-BLU : 143
BLU-YLW : 47 BRN-RED : 309

1.5+ 440V
250V 6.3A

MSBPC20 12V 250"

TO OUTDOOR UNIT : 3P TO WIRED REMOTE CONTROLLER : 2P (SLZ-KA25/35/50VA)

141:i3:

240V AC 15W

INDOOR UNIT

Item

Service ref.

Indoor fan capacitor
Fuse
Vane motor
Terminal block
Indoor fan motor thermal fuse
Cord Heater

SLZ-KA25VAL

(1).TH SLZ-KA35VAL(1).TH SLZ-KA50VAL(1).TH

(C1)

(FUSE)

(MV)

(TB)

(H2)

SLZ-KA25VA

(1).TH SLZ-KA35VA(1).TH SLZ-KA50VA(1).TH

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. 15:
Refrigerant piping length (one way): 5m

✽1 Measured under rated operating frequency

Specifications and rating conditions of main electric parts

Outdoor D.B. 7: W.B. 6:

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

SLZ-KA35VAL.TH
SLZ-KA35VA.TH
SLZ-KA35VAL

1.TH

SLZ-KA35VA

1.TH

High

Medium

38

SPL(dB)33LINE

<50Hz>

NOTCH

Low

29

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-KA25VAL.TH
SLZ-KA25VA.TH
SLZ-KA25VAL

1.TH

SLZ-KA25VA

1.TH

High

Medium

37

SPL(dB)31LINE

<50Hz>

NOTCH

Low

28

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-KA50VAL.TH
SLZ-KA50VA.TH
SLZ-KA50VAL

1.TH

SLZ-KA50VA

1.TH

High

Medium

39

SPL(dB)34LINE

<50Hz>

NOTCH

Low

30

NOTE: The sound level is measured in an anechoic room where echoes are few, when compressor stops. The sound

may be bigger than the indicated level in actual use due to surrounding echoes. The sound level can be high­er by about 2 dB than the indicated level during cooling and heating operation.

7

4

SLZ-KA50VA(L)

SLZ-KA35VA(L)

SLZ-KA25VA(L)

Brand label

(Case of Wired remote controller)

Terminal block

Terminal block

87

Suspension bolt

M10 or 3/8

(procure locally)

1/4 inch

flared connection

{ 6.35mm

1/4 inch

flared connection

{ 6.35mm

{ 9.52mm

flared connection

3/8 inch

1/2 inch

flared connection

Refrigerent pipe (liquid)

Refrigerent pipe (gas)

Models

{ 6.35mm

flared connection

1/4 inch

Refrigerent pipe

(liquid)

Refrigerent pipe

(gas)

{ 12.7mm

{ 9.52mm

flared connection

3/8 inch

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

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

DEFROST/STAND BY lamp

(WIRELESS PANEL)

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

Ceiling surface

235
208

27

+5

0

193

20

93

38~58

66121

17 202

56
57

31

Ceiling hole

Suspension bolt pitch

15~37 15~37576~620

420

570
335

199

352

335

Suspension bolt

pitch

Ceiling hole

V/M

V/M

V/M

OUTLINES AND DIMENSIONS

SLZ-KA25VAL.TH
SLZ-KA35VAL.TH
SLZ-KA50VAL.TH
SLZ-KA25VA.TH
SLZ-KA35VA.TH
SLZ-KA50VA.TH
SLZ-KA25VAL1.TH
SLZ-KA35VAL1.TH
SLZ-KA50VAL1.TH
SLZ-KA25VA1.TH
SLZ-KA35VA1.TH
SLZ-KA50VA1.TH

Unit : mm

8

WIRELESS REMOTE CONTROLLER

Installation area

• Area in which the remote controller is not exposed to direct sunshine

• Area in which there is no heating source nearby

• 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 2 tapping screws.
2 Insert 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

9

WIRED REMOTE CONTROLLER

130

120

19

43.5

Unit : mm

10

5

SWE

GRILLE

OFF

ON

SW3

OFF

54321

ON

SW2

OFF

54321

ON

WHT

RED

RED

CNDK

(POWER
BOARD)

ZNR

X1

RED

ORN

YLW

YLW

BLU

BLU

BLU

BLU

LED3

CN2L

CN32 CN51 CN41

(REMOCON)

BLU

TO OUTDOOR UNIT

S3

ORN

MF

MV

MV

MV

MV

5

5

5

5

H2

5

21

P.B

3

TB4

S1
S2

TB15

1
2

TO MA-REMOTE
CONTROLLER
DC8.7-13V

}

REMOTE
CONTROLLER

W.R

9

5

CN6V

(VANE)

GRN

BLU

WHT

ORN

RED

YLW

YLW

X5

X5 X4

X4X7X6

X6 X7

97531

C1

BLK

WHT

BLU

YLW

BRN

RED

I.B

CNB

BZ

LED2

LED1

SW1

SW2

RU

W.B

9

CN22

1

(2 PHASE)

CN29

BLK

WHT

RED

(INTAKE)

(LIQUID)

CN31

3

CN20

CN21

112

212

2

12

DS

TH5

TH1

TH2

X1

YLW

BLU

(D·U·M)

CNP

RED

(D·HEATER)

CNC

313131

CND

(POWER)

ORN

FUSE

(CONTROL)

CN3C

BLU

3131

LED1

12

12

TRANS

DC13.1V
CN2S(WHT)

AC220-240V
CNSK(RED)

WHT

BLK

2

1

(POWER
BOARD)

CN2D

WHT

LED2

* Case of wireress model

* Case of wired model

See fig:w1

MODELS

KA25

KA35

KA50

<fig:w1>

ON

OFF

12345

ON

OFF

12345

ON

OFF

12345

SW2

YLW

YLW

RED

ORN

YLW

WHT

BLU

17451089236

DP

GRY

VLT

BLU

YLW

ORN

RED

BRN

SKYBLU

PINK

WHT

(WIRELESS)

CN90

987654321

654321

(FAN)

FAN

WHT

BRN
RED
ORN
YLW
BLU

VLT
GRY
PINK

SKY BLU

123456789

(DRAIN)

WHT

NOTES : 1. 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 have polarities, make sure to match terminal numbers(S1,S2,S3) for correct wiring.

3. Symbols used in wiring diagram above are, : Connector, : Terminal (block).

w For details on how to operate self-diagnosis, refer to the technical manuals etc.

SWITCH(COOLING ON/OFF)

LED(RUN INDICATOR)

SWITCH(HEATING ON/OFF)

LED(HOT ADJUST)

BUZZER

RECEIVING UNIT

WIRELESS REMOTE CONTROLLER BOARD

SW2

SW1

LED2

RU

LED1

BZ

W.B

H2

DP
DS

MV

MF FAN MOTOR

VANE MOTOR

DRAIN PUMP
DRAIN SENSOR
DEW PREVENTION HEATER

C1 CAPACITOR(FAN MOTOR)

FUSE(T6.3AL250V)

X7

X6

X5

X4

X1

ZNR

RELAY(FAN MOTOR Me)

RELAY(FAN MOTOR Hi)

RELAY(FAN MOTOR LL)
RELAY(FAN MOTOR Lo)

DRAIN PUMP/DEW PREVENTION HEATER

VARISTOR

SYMBOL NAME

SWITCH(CAPACITY CODE)

SW3

SW2

SWE SWITCH(EMERGENCY OPERATION)

SWITCH(MODE SELECTION)

TRANSMISSION(INDOOR-OUTDOOR)

LED1
LED2
LED3

POWER SUPPLY(I.B)
POWER SUPPLY(I.B)

CN51

CENTRALLY CONTROL

FUSE

P.B

CONNECTOR(HA TERMINAL-A)

CONNECTOR(REMOTE SWITCH)

CONNECTOR(LOSSNAY)

CN41

CN32

CN2L

INDOOR CONTROLLER BOARD

INDOOR POWER BOARD

I.B

NAMESYMBOL

TB4

TB15

TH1

TH2

TH5

TERMINAL BLOCK(INDOOR/OUTDOOR CONNECTING LINE)
TERMINAL BLOCK(REMOTE CONTROLLER
TRANSMISSION LINE)
ROOM TEMP.THERMISTOR
(0°C/15kΩ, 25°C/5.4kΩ DETECT)
PIPE TEMP.THERMISTOR/LIQUID
(0°C/15kΩ, 25°C/5.4kΩ DETECT)
COND./EVA.TEMP.THERMISTOR
(0°C/15kΩ, 25°C/5.4kΩ DETECT)

[LEGEND]

WIRING DIAGRAM

SLZ-KA25VAL.TH SLZ-KA25VA.TH SLZ-KA25VAL1.TH SLZ-KA25VA1.TH
SLZ-KA35VAL.TH SLZ-KA35VA.TH SLZ-KA35VAL1.TH SLZ-KA35VA1.TH
SLZ-KA50VAL.TH SLZ-KA50VA.TH SLZ-KA50VAL1.TH SLZ-KA50VA1.TH

11

6

Pipe temperature
thermistor/liquid
(TH2)

Distributor
with strainer
#50

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

SLZ-KA25VAL.TH SLZ-KA25VA.TH SLZ-KA25VAL1.TH SLZ-KA25VA1.TH
SLZ-KA35VAL.TH SLZ-KA35VA.TH SLZ-KA35VAL1.TH SLZ-KA35VA1.TH
SLZ-KA50VAL.TH SLZ-KA50VA.TH SLZ-KA50VAL1.TH SLZ-KA50VA1.TH

12