Mitsubishi SLZ-KA25VA(L), SLZ-KA35VA(L), SLZ-KA50VA(L) 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

No. OC320

Indoor unit
[Model names] [Service Ref.]

SLZ-KA25VA SLZ-KA25VA.TH
SLZ-KA35VA SLZ-KA35VA.TH
SLZ-KA50VA SLZ-KA50VA.TH
SLZ-KA25VAL SLZ-KA25VAL.TH
SLZ-KA35VAL SLZ-KA35VAL.TH
SLZ-KA50VAL SLZ-KA50VAL.TH

CONTENTS

Note :

•This manual does not cover
outdoor units. When servicing
outdoor units, please refer
to the service manual
No.OC322 together with this
manual.

1. PART NAMES AND FUNCTIONS ········2

2. SPECIFICATIONS·································5

3. OUTLINES AND DIMENSIONS············7

4. WIRING DIAGRAM·····························10

5.

Model name
indication

INDOOR UNIT

REFRIGERANT SYSTEM DIAGRAM

6. TROUBLESHOOTING ························12

7. 4-WAY AIR FLOW SYSTEM ···············19

·······11

8. DISASSEMBLY PROCEDURE ···········21

9. PARTS LIST········································24

TEMP.

SLZ-KA25,35,50VAL.TH SLZ-KA25,35,50VA.TH

REMOTE CONTROLLER

ON/OFF

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-KA25VAL.TH SLZ-KA25VA.TH
SLZ-KA35VAL.TH SLZ-KA35VA.TH
SLZ-KA50VAL.TH SLZ-KA50VA.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.

Wireless remote controller
SLZ-KA25VAL.TH
SLZ-KA35VAL.TH
SLZ-KA50VAL.TH

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.

SET TEMPERATURE
button

SET TEMPERATURE
button sets and any
desired room temperature.

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

Wired remote controller

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

MENU

BACK DAY

MONITOR/SET

CLOCK

ON/OFF

Set Temperature 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
door.

Start/Stop button

Fan Speed button

Filter button
(<return sign> button)

Test Run button

Service button (Clear button)

Airflow Up/Down button

Louver button
( Operation button)

To preceding operation
number.

Ventilation button
(

Operation button)

To next operation number.

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

SLZ-KA25VA.TH
SLZ-KA35VA.TH
SLZ-KA50VA.TH

● Operation buttons [ PAR-21MAA ]

3

● Display

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

˚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

Identifies the current operation

Shows the operating mode, etc.
* Multilanguage display is sup-

ported.

“Centrally Controlled” indicator

Indicates that operation of 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, shows the time
remaining.

“Sensor” indication

Displayed when the remote controller
sensor is used.

“Locked” indicator

Indicates that remote controller but­tons have been locked.

“Clean The Filter” indicator

Comes 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

The indicator shows the direc­tion of the outcoming airflow.

“One Hour Only” indicator

Displayed if the airflow is set to
weak and downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off after one
hour, at which time the airflow di­rection also changes.

Room Temperature display

Shows the room temperature.

Louver display

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

(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.

Caution

● Only the Power display lights when the unit is stopped and power supplied to the unit.

● When power is turned ON for the first time the (Centrally controlled) display appears to go off momentarily but this is not a

malfunction.

● “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 “PLEASE WAIT” is displayed on the room temperature indica­tion (For max. 2minutes). Please wait until this “PLEASE WAIT” indication disappear then start the operation.

4

2

SLZ-KA25VAL.TH

SLZ-KA25VA.TH

SLZ-KA35VAL.TH

SLZ-KA35VA.TH

Indoor model

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 (at20:)

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.TH

SLZ-KA50VA.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.TH)

145:i2:

240V AC 15W

INDOOR UNIT

Item

Model

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

SLZ-KA25VAL.TH SLZ-KA35VAL.TH SLZ-KA50VAL.TH

(C1)

(FUSE)

(MV)

(TB)

(H2)

SLZ-KA25VA.TH SLZ-KA35VA.TH SLZ-KA50VA.TH

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:

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

SLZ-KA35VAL.TH
SLZ-KA35VA.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

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

High

Medium

39

SPL(dB)34LINE

<50Hz>

NOTCH

Low

30

6

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

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)

1/4F

flared connection

{ 6.35mm

1/4F

flared connection

{ 6.35mm

{ 9.52mm

flared connection

3/8F

1/2F

flared connection

Refrigerent pipe (liquid)

Refrigerent pipe (gas)

Models

{ 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

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

Unit : mm

7

WIRELESS 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

8

WIRED REMOTE CONTROLLER

130

120

19

Unit : mm

9