Mitsubishi SLZ-KA25VAL3 Series, SLZ-KA25VAL3.TH, SLZ-KA50VAL3 Series, SLZ-KA35VAL3 Series, SLZ-KA25VAL3.TH-ER Technical & Service Manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

June 2014

No. OCH564

Indoor unit
[Model Name] [Service Ref.]

SLZ-KA25VAL3

SLZ-KA25VAL3.TH

SLZ-KA25VAL3.TH-ER

SLZ-KA35VAL3

SLZ-KA35VAL3.TH

SLZ-KA35VAL3.TH-ER

SLZ-KA50VAL3

SLZ-KA50VAL3.TH

SLZ-KA50VAL3.TH-ER

Note:

• This manual describes only
service data of the indoor units.

Model name
indication

ON/OFF

TOO

TOO

WARM

COOL

FAN

SELECT

AUTO COOL

TIME

VANE

DRY

HEAT

MODE

RESET

REMOTE CONTROLLER

INDOOR UNIT

WIRED REMOTE CONTROLLER

(Option)

CONTENTS

1. REFERENCE MANUAL

2. PARTS NAMES AND FUNCTIONS

3. SPECIFICATIONS

4. OUTLINES AND DIMENSIONS

5. WIRING DIAGRAM

6.

REFRIGERANT SYSTEM DIAGRAM

7. TROUBLESHOOTING

8. 4-WAY AIR FLOW SYSTEM

9. DISASSEMBLY PROCEDURE

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PARTS CATALOG (OCB564)

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2
2
6

8
11
12
13
27
29

Use the specied refrigerant only

OCH564

Never use any refrigerant other than that specied.

Doing so may cause a burst, an explosion, or re when the unit is being used, serviced, or disposed of.
Correct refrigerant is specied in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.

1

REFERENCE MANUAL

1-1. OUTDOOR UNIT’S SERVICE MANUAL

Service Ref. Service Manual No.

SUZ-KA25/35/50VA4.TH

OCH545/OCB545

1-2. TECHNICAL DATA BOOK

Series (Outdoor unit) Data Book No.

SUZ-KA

•

VA4 OCS26

2

PARTS NAMES AND FUNCTIONS

2-1. INDOOR UNIT

Horizontal Air Outlet
Sets horizontal airflow automatically

during cooling or dehumidifying.

Filter
Removes dust and pollutants

from drawn in air.

Grille

Auto Air Swing Vane
Disperses airflow up and

down and adjusts the angle
of airflow direction.

Air Intake
Draws in air from room.

2-2. WIRELESS REMOTE CONTROLLER

OCH564

TEMPERATURE
SETTING button

To set any

h

temperature.

desired room

ON/OFF

TOO

WARM

TOO

COOL

ON / OFF button

To start and to stop operation.

MODE SELECT button

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

AUTO COOL

DRY

HEAT

MODE

FAN

VANE

SELECT

TIME

RESET

TIMER SELECT button

To set time to start or stop
unit operation.

FAN SPEED button

To set fan speed to Low,
Medium or High.

VANE CONTROL button

To change the airflow
direction.

Attention:

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

33

2-3. Wired remote controller (Option) PAR-31MAA

OCH564

The functions which can be used are restricted according to each model.

Display

Full mode

6

7

8

9

10

1

11

The main display can be displayed in two different modes: "Full" and "Basic."
The initial setting is "Full."

15

13

14

12

Room

Cool Auto

Mode Temp. Fan

Set temp.

21

Basic mode

Cool

1

Mode Temp. Fan

Note: All icons are displayed for explanation.

1 Operation mode

Indoor unit operation mode appears here.

181716

3

Fri

19

20

2 Preset temperature

Preset temperature appears here.

3 Clock

(See the Installation Manual.)

Current time appears here.

4 Fan speed

4

Fan speed setting appears here.

5 Button function guide

Functions of the corresponding buttons appear

2

5

here.

6

Appears when the ON/OFF operation is centrally
controlled.

7

2

3

Fri

AutoSet temp.

4

Appears when the operation mode is centrally
controlled.

8

Appears when the preset temperature is centrally
controlled.

9

Appears when the filter reset function is centrally
controlled.

10

Indicates when filter needs maintenance.

11 Room temperature

5

(See the Installation Manual.)

Current room temperature appears here.

12

Appears when the buttons are locked.

13

Appears when the On/Off timer or Night setback
function is enabled.

14

Appears when the Weekly timer is enabled.

15

Appears while the units are operated in the
energy-save mode.

16

Appears while the outdoor units are operated in
the silent mode.

17

Appears when the built-in thermistor on the
remote controller is activated to monitor the
room temperature (a).

appears when the thermistor on the
indoor unit is activated to monitor the room
temperature.

18

Indicates the vane setting.

19

Indicates the louver setting.

20

Indicates the ventilation setting.

21

Appears when the preset temperature range is
restricted.

Controller interface

*

1234

Function buttons

10987

• When the backlight is off, pressing any button turns the backlight on and

does not perform its function. (except for the ON/OFF button)

• Most settings (except ON/OFF, mode, fan speed, temperature) can be

made from the Menu screen.

1 ON/OFF button

Press to turn ON/OFF the indoor unit.

2 SELECT button

Press to save the setting.

3 RETURN button

5

Press to return to the previous screen.

4 MENU button

Press to bring up the Main menu.

6

5 Backlit LCD

Operation settings will appear.
When the backlight is off, pressing any
button turns the backlight on and it
will stay lit for a certain period of time
depending on the screen.

6 ON/OFF lamp

This lamp lights up in green while the unit
is in operation. It blinks while the remote
controller is starting up or when there is
an error.

The functions of the function buttons
change depending on the screen. Refer
to the button function guide that appears
at the bottom of the LCD for the functions
they serve on a given screen.
When the system is centrally controlled,
the button function guide that
corresponds to the locked button will not
appear.

Main display Main menu

Room

Set temp.

Cool Auto

Mode Temp. Fan

7 8 9 0 7 8 9 0

Function guide

Main

Fri

Main menu

Vane·Louver·Vent. (Lossnay)
High power
Timer
Weekly timer
OU silent mode

Main display:

Cursor Page

7 Function button F1

Main display: Press to change the operation
mode.
Main menu: Press to move the cursor down.

8 Function button F2

Main

display
Main menu: Press to move the cursor up.

: Press to decrease temperature.

9 Function button F3

Main

display

Main menu: Press to go to the previous page.

: Press to increase temperature.

10 Function button F4

Main

display

Main menu: Press to go to the next page.

: Press to change the fan speed.

4 5

Main menu list

OCH564

Setting and display items Setting details

Vane · Louver · Vent.

(Lossnay)

High power Use to reach the comfortable room temperature quickly.

Timer On/Off timer* Use to set the operation On/Off times.

Auto-Off timer Use to set the Auto-Off time.

Filter information Use to check the lter status.

Error information Use to check error information when an error occurs.

Weekly timer* Use to set the weekly operation On / Off times.

Energy saving Auto return Use to get the units to operate at the preset temperature after performing energy-save operation for a specied

Schedule* Set the start/stop times to operate the units in the energy-save mode for each day of the week, and set the

Night setback* Use to make Night setback settings.

Restriction Temp. range Use to restrict the preset temperature range.

Operation lock Use to lock selected functions.

Maintenance Auto descending panel Auto descending panel (Optional parts) Up / Down you can do.

Manual vane angle Use to set the vane angle for each vane to a xed position.

Initial setting Main/Sub When connecting two remote controllers, one of them needs to be designated as a sub controller.

Clock Use to set the current time.

Main display Use to switch between "Full" and "Basic" modes for the Main display.

Contrast Use to adjust screen contrast.

Initial setting Display details Make the settings for the remote controller related items as necessary.

Auto mode Whether or not to use the AUTO mode can be selected by using the button.

Administrator

word

Language selection Use to select the desired language.

Service Test run Select "Test run" from the Service menu to bring up the Test run menu.

Input maintenance Select "Input maintenance Info." from the Service menu to bring up the Maintenance information screen.

Function setting Make the settings for the indoor unit functions via the remote controller as necessary.
LOSSNAY setting
(City Multi only)

Check Error history: Display the error history and execute "delete error history".

Self check Error history of each unit can be checked via the remote controller.

Maintenance password Take the following steps to change the maintenance password.

Remote controller
check

* Clock setting is required.

pass-

Use to set the vane angle.

• Select a desired vane setting from ve different settings.

Use to turn ON / OFF the louver.

• Select a desired setting from "ON" and "OFF."

Use to set the amount of ventilation.

• Select a desired setting from "Off," "Low," and "High."

• Units can be operated in the High-power mode for up to 30 minutes.

• Time can be set in 5-minute increments.

• Time can be set to a value from 30 to 240 in 10-minute increments.

• The lter sign can be reset.

• Check code, error source, refrigerant address, unit model, manufacturing number, contact information (dealer's phone
number) can be displayed.

(The unit model, manufacturing number, and contact information need to be registered in advance to be displayed.)

• Up to eight operation patterns can be set for each day.

(Not valid when the On/Off timer is enabled.)

time period.

• Time can be set to a value from 30 and 120 in 10-minute increments.

(This function will not be valid when the preset temperature ranges are restricted.)

energy-saving rate.

• Up to four energy-save operation patterns can be set for each day.

• Time can be set in 5-minute increments.

• Energy-saving rate can be set to a value from 0% and 50 to 90% in 10% increments.

Select "Yes" to enable the setting, and "No" to disable the setting. The temperature range and the start/stop times can be set.

•

• Different temperature ranges can be set for different operation modes.

• The locked functions cannot be operated.

• The initial setting is "Full."

Clock: The initial settings are "Yes" and "24h" format.
Temperature: Set either Celsius (°C) or Fahrenheit (°F).
Room temp. : Set Show or Hide.
Auto mode: Set the Auto mode display or Only Auto display.

This setting is valid only when indoor units with the AUTO mode function are connected.

The administrator password is required to make the settings for the following items.

• Timer setting • Energy-save setting • Weekly timer setting

• Restriction setting • Outdoor unit silent mode setting • Night set back

• Test run • Drain pump test run

The following settings can be made from the Maintenance Information screen.

• Model name input • Serial No. input • Dealer information input

This setting is required only when the operation of City Multi units is interlocked with LOSSNAY units.

Refrigerant leak check: Refrigerant leaks can be judged.

Smooth maintenance: The indoor and outdoor maintenance data can be displayed.
Request cord: Details of the operation data including each thermistor temperature and error history can be checked.

When the remote controller does not work properly, use the remote controller checking function to trouble­shoot the problem.

5

3

OCH564

SPECIFICATIONS

Indoor service ref.

Mode

Power supply (phase, cycle, voltage)

Input
Running current*
Dew prevention heater
Power factor*

Electrical

data

Fan motor output*

Airflow (Low/Midium/High)

K/h

Noise level (Low/Midium/High)

Width

snoisnemiD

Depth
Height

Weight

NOTE : Test conditions are based on ISO 5151.
Cooling : Indoor D.B. 27˚C W.B. 19˚C
Outdoor D.B. 35˚C W.B. 24˚C
Heating : Indoor D.B. 20˚C W.B. 15˚C
Outdoor D.B. 7˚C W.B. 6˚C
Refrigerant piping length (one way): 5m
*Measured under rated operating frequency

mm (in)
mm (in)
mm (in)

kW

A
W
%

kW

dB

kg

SLZ-KA25VAL3.TH(-ER)

Cooling Heating

Single phase
50 Hz, 230 V

0.05 0.03

0.37 0.26

0.014

59 51

0.05

480/540/660

29/33/38

SLZ-KA35VAL3.TH(-ER)

Cooling

Heating

Single phase
50 Hz, 230 V

0.05 0.03

0.37 0.26

0.014

59 51

0.05

480/540/660

29/33/38

UNIT: 570 (22-7/16) PANEL: 650 (25-9/16)
UNIT: 570 (22-7/16) PANEL: 650 (25-9/16)
UNIT: 235 (9-1/4) PANEL: 20 (13-13/16)
UNIT: 16 PANEL: 3

SLZ-KA50VAL3.TH(-ER)

Cooling

Heating

Single phase
50 Hz, 230 V

0.05 0.03

0.37 0.26

0.014

59 51

0.05

480/540/660

30/34/39

Specifications and rating conditions of main electric parts

INDOOR UNIT

Item

Fuse

Vane motor

Terminal block

Cord Heater

Service ref.

(FUSE)

(MV)

(TB)

(H2)

SLZ-KA25VAL3.TH(-ER)

TO OUTDOOR UNIT: 3P TO WIRED REMOTE CONTROLLER: 2P

SLZ-KA35VAL3.TH(-ER)

250V 6.3A

MSBPC20 12V 250"

240V AC 15W

SLZ-KA50VAL3.TH(-ER)

NOISE CRITERION CURVES

OCH564

SLZ-KA25VAL3.TH(-ER)
SLZ-KA35VAL3.TH(-ER)

NOTCH

High

Medium

Low

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

<50Hz>

SPL(dB)33LINE

38

29

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

SLZ-KA50VAL3.TH(-ER)

NOTCH

High

Medium

Low

90

80

70

60

50

40

30

APPROXIMATE

20

THRESHOLD OF

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

HEARING FOR
CONTINUOUS
NOISE

10

63 125 250 500 1000 2000 4000 8000

BAND CENTER FREQUENCIES, Hz

<50Hz>

SPL(dB)34LINE

39

30

NC-70

NC-60

NC-50

NC-40

NC-30

NC-20

UNIT

CEILING

1.5m

MICROPHONE

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.

77

4

OCH564

OUTLINES AND DIMENSIONS

SLZ-KA25VAL3.TH
SLZ-KA35VAL3.TH
SLZ-KA50VAL3.TH
SLZ-KA25VAL3.TH-ER
SLZ-KA35VAL3.TH-ER
SLZ-KA50VAL3.TH-ER

570

335

Unit: mm

Refrigerent pipe

(gas)

flared connection

{ 9.52mm

Refrigerent pipe

(liquid)

flared connection

{ 6.35mm

Models

18248

Wiring entry

Suspension bolt

M10 or 3/8

(procure locally)

87

31

Drain pipe

VP-25 connection

(O.D. { 32)

235

208

193

20

0

Brand label

27

+5

Grille

Auto vane

Drain hole

SLZ-KA25VAL3

377

3/8 inch

flared connection

{ 9.52mm

1/4 inch

flared connection

{ 6.35mm

SLZ-KA35VAL3

Air intake hole

3/8 inch

{ 12.7mm

1/4 inch

{ 6.35mm

1/2 inch

flared connection

1/4 inch

flared connection

SLZ-KA50VAL3

Vane motor

Air intake grille

Fresh air

intake

530

Suspension bolt

pitch

Ceiling hole

{ 73.4

Cut out hole

570

Suspension bolt pitch

420

120

V/M

Ceiling surface

15~37 15~37576~620

352

335

Ceiling hole

576~620

15~37 15~37

230

17 202

66121

Refrigerent pipe (liquid)

Refrigerent pipe (gas)

199

56
57

Grille

301

650

Terminal block

Air outlet hole

Terminal block

(Case of Wired remote controller)

lower edge
Suspension bolt

93

38~58

V/M

55 35

Air outlet hole

301

650

Receiver

V/M

V/M

377

Air intake hole

35 55

25

{ 100

3- { 2.8 hole

Detail drawing of fresh air intake

Burring hole

Operation lamp

118

120

Ceiling surface

(WIRELESS PANEL)

DEFROST/STAND BY lamp

Emergency operation switch(cooling)

Emergency operation switch(heating)

WIRELESS REMOTE CONTROLLER

OCH564

57 17.5

Unit: mm

h

B

D

C

A

140

ON/OFF

AUTO COOL

HEAT

MODE

DRY

TOO

WARM

FAN

VANE

TOO

COOL

SELECT

TIME

RESET

Installation area

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

• 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.

99

WIRED REMOTE CONTROLLER PAR-31MAA

OCH564

(Option)

Unit: mm

19120

120

46

83.5