Mitsubishi SLZ-KA25VAQ, SLZ-KA35VAQ, SLZ-KA25VAQ2, SLZ-KA50VAQ Service Manual

TECHNICAL & SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

CONTENTS

1. TECHNICAL CHANGES

......................

2

2. REFERENCE SERVICE MANUAL

......

2

3. PART NAMES AND FUNCTIONS

.......

2

4. SPECIFICATIONS

...............................

6

5. OUTLINES AND DIMENSIONS

...........

8

6. WIRING DIAGRAM

............................

10

7.

REFRIGERANT SYSTEM DIAGRAM

.....

11

8. TROUBLESHOOTING

.......................

12

9. 4-WAY AIR FLOW SYSTEM

..............

25

10. DISASSEMBLY PROCEDURE

..........

27

October 2012

No. OCH493

REVISED EDITION-D

WIRED REMOTE CONTROLLER

(Option)

Indoor unit
[Model names] [Service Ref.]

SLZ-KA25VAQ.TH
SLZ-KA25VAQR1.TH
SLZ-KA25VAQ2.TH
SLZ-KA35VAQ.TH
SLZ-KA35VAQR1.TH
SLZ-KA35VAQR2.TH
SLZ-KA50VAQ.TH
SLZ-KA50VAQR1.TH
SLZ-KA50VAQR2.TH

INDOOR UNIT

Model name
indication

ON/OFF

TEMP.

Note:

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

PARTS CATALOG (OCB493)

Revision:

• SLZ-KA25VAQ2.TH and
SLZ-KA35/50VAQR2.TH

have been added in

REVISED EDITION-D.

• Some descriptions have
been modified.

• Please void OCH493
REVISED EDITION-C.

SLZ-KA25VAQ

SLZ-KA25VAQ2
SLZ-KA35VAQ

SLZ-KA50VAQ

2

Auto Air Swing Vane
Disperses airflow up and

down and adjusts the angle
of airflow direction.

Grille

Filter
Removes dust and pollutants

from drawn in air.

Horizontal Air Outlet
Sets horizontal airflow

automatically during
cooling or dehumidifying.

Air Intake
Draws in air from room.

3-1. Indoor unit

3

PART NAMES AND FUNCTIONS

Use the specifi ed refrigerant only

Never use any refrigerant other than that specifi ed.

Doing so may cause a burst, an explosion, or fi re when the unit is being used, serviced, or disposed of.
Correct refrigerant is specifi 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

TECHNICAL CHANGES

2

REFERENCE SERVICE MANUAL

2-1. OUTDOOR UNIT’S SERVICE MANUAL

2-2. TECHNICAL DATA BOOK

Service Ref Service Manual No.
SUZ-KA25/50VA3.TH-A OCH511/OCB511

SUZ-KA25/35/50VA2.TH OCH472/OCB472
SUZ-KA25/35/50VA2.TH-A OCH473/OCB473
SUZ-KA25/35/50VA3.TH OCH530/OCB530

SLZ-KA35VAQR1.TH SLZ-KA35VAQR2.TH
SLZ-KA50VAQR1.TH SLZ-KA50VAQR2.TH

• INDOOR CONTROLLER BOARD has been changed.

SLZ-KA25VAQ.TH SLZ-KA25VAQR1.TH
SLZ-KA35VAQ.TH SLZ-KA35VAQR1.TH
SLZ-KA50VAQ.TH SLZ-KA50VAQR1.TH

• TURBO FAN and WASHER have been changed.

Series (Outdoor unit) Data Book No.
SUZ-KA

•

VA

SUZ-KA

•

VAH

OCS03

SUZ-KA

•

VA3 OCS22

OCH493D

33

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

Fri

Mode Temp. Fan

Room

Cool Auto

Set temp.

Fri

Cool

Mode Temp. Fan

AutoSet temp.

1

2

3

4

5

20

19

4

3

181716

15

14

13

12

6
8

10

1

11

7
9

21

5

2

Fan speed setting appears here.

4 Fan speed

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

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

Preset temperature appears here.

Appears when the ON/OFF operation is centrally
controlled.

Current time appears here.

Appears when the buttons are locked.

Indoor unit operation mode appears here.

Appears when the operation mode is centrally
controlled.

15

16

2 Preset temperature

6

12

1 Operation mode

7

Indicates the vane setting.

18

Indicates the louver setting.

Indicates the ventilation setting.

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

19

20

13

Indicates when filter needs maintenance.

Appears when the filter reset function is centrally
controlled.

Appears when the preset temperature is centrally
controlled.

10

9

8

Appears when the Weekly timer is enabled.

14

Appears when the preset temperature range is
restricted.

21

Functions of the corresponding buttons appear
here.

5 Button function guide

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.

17

3 Clock

(See the Installation Manual.)

Current room temperature appears here.

11 Room temperature

(See the Installation Manual.)

* All icons are displayed for explanation.

5

6

1234

Press to turn ON/OFF the indoor unit.

1 ON/OFF button

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.

Press to save the setting.

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

Press to return to the previous screen.

Main

display

: Press to decrease temperature.

Main menu: Press to move the cursor up.

Press to bring up the Main menu.

Main

display

: Press to increase temperature.

Main menu: Press to go to the previous page.

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.

Main

display

: Press to change the fan speed.

Main menu: Press to go to the next page.

6 ON/OFF lamp

2 SELECT button

7 Function button F1

3 RETURN button

8 Function button F2

4 MENU button

9 Function button F3

5 Backlit LCD

10 Function button F4

Fri

Room

Set temp.

Mode Temp. Fan

Cool Auto

Main

Main display:

Cursor Page

Main menu

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

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

Function guide

7890 7890

• 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.

Display

Full mode

Basic mode

Controller interface

Function buttons

10987

3-2. Wired remote controller (Option) PAR-30MAA

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

OCH493D

4

Setting and display items Setting details

Vane · Louver · Vent.
(Lossnay)

Use to set the vane angle.

• Select a desired vane setting from fi 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."

High power Use to reach the comfortable room temperature quickly.

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

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

• Time can be set in 5-minute increments.
* Clock setting is required.

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

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

Filter information Use to check the fi lter status.

• The fi lter sign can be reset.

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

• Error 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.

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

• Up to eight operation patterns can be set for each day.
* Clock setting is required.
* Not valid when the On/Off timer is enabled.

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

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.

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

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.
* Clock setting is required.

Night setback Use to make Night setback settings.

•

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

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

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

Operation lock Use to lock selected functions.

• The locked functions cannot be operated.

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 fi 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.

• The default setting is "Full."

Contrast Use to adjust screen contrast.

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

Clock: The factory 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.

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

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

Administrator

pass-

word

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

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.

• Test run • Drain pump test run

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

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

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

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

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

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

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.

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

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

Main menu list

OCH493D

5

°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

PAR-21MAA

ON/OFF

FILTER

CHECK

OPERATION

CLEAR

TEST

TEMP.

MENU

BACK DAY

MONITOR/SET

CLOCK

ON/OFF

Display Section

For purposes of this explanation,
all parts of the display are shown.
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

Displays 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

The 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.

Operation Section

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
cover

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

Displays if the airflow is set to
Low or downward during COOL
or DRY mode. (Operation varies
according to model.)
The indicator goes off in 1 hour,
when the airflow direction also
changes.

3-3. Wired remote controller (Option) PAR-21MAA

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

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

OCH493D

6

SPECIFICATIONS

4

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:
Outdoor D.B. 7: W.B. 6:
Refrigerant piping length (one way): 5 m
*1 Measured under rated operating frequency

Specifications and rating conditions of main electric parts

SLZ-KA25VAQ.TH

SLZ-KA35VAQ.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

Cooling90Heating

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(at 25)
Thermistor TH2(at 25)
Thermistor TH5(at 25)

* /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 : 235(9-1/4) 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

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

SLZ-KA50VAQ.TH

SLZ-KA25VAQR1.TH

SLZ-KA35VAQR2.TH SLZ-KA50VAQR2.TH

SLZ-KA35VAQR1.TH

SLZ-KA25VAQ2.TH

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

SLZ-KA50VAQR1.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

Cooling97Heating

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

141 $ 3

240V AC 15W

INDOOR UNIT

Item

Service ref.

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

SLZ-KA50VAQ.TH
SLZ-KA50VAQR1.TH
SLZ-KA50VAQR2.TH

SLZ-KA25VAQ.TH
SLZ-KA25VAQR1.TH
SLZ-KA25VAQ2.TH

SLZ-KA35VAQ.TH
SLZ-KA35VAQR1.TH
SLZ-KA35VAQR2.TH

(C1)

(FUSE)

(MV)

(TB)

(H2)

OCH493D

77

NOISE CRITERION CURVES

UNIT

1.5 m

MICROPHONE

CEILING

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.

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD 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-KA50VAQ.TH
SLZ-KA50VAQR1.TH
SLZ-KA50VAQR2.TH

High

Medium

39

SPL(dB)34LINE

<50Hz>

NOTCH

Low

30

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD 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-KA25VAQ.TH
SLZ-KA25VAQR1.TH

High

Medium

37

SPL(dB)31LINE

<50Hz>

NOTCH

Low

28

90

80

70

60

50

40

30

20

10

63 125 250 500 1000 2000 4000 8000

APPROXIMATE
THRESHOLD 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-KA25VAQ2.TH
SLZ-KA35VAQ.TH
SLZ-KA35VAQR1.TH
SLZ-KA35VAQR2.TH

High

Medium

38

SPL(dB)33LINE

<50Hz>

NOTCH

Low

29

OCH493D

8

OUTLINES AND DIMENSIONS

5

(Case of Wired remote controller)

Terminal block

Terminal block

Suspension bolt
M10 or 3/8
(procure locally)

Refrigerent
pipe (liquid)

Refrigerent
pipe (gas)

Grille

Drain pipe
VP-25 connection
(O.D. W 32)

Suspension bolt

lower edge

230

18248

Wiring entry

Ceiling surface

235

208

27

+5

0

193

20

93

38~58

66121

17 202

87

15~37 15~37

576~620

570

530

Fresh air
intake

56

57

31

Ceiling hole

Suspension bolt pitch

15~37 15~37576~620

420

570

335

199

352
335

Suspension bolt
pitch

Ceiling hole

Brand label

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

377

377

650

650

V/M

V/M

V/M

Detail drawing of fresh air intake

Ceiling surface

Cut out hole

W 73.4

Burring hole

3- W 2.8 hole

W 100

118

25

120°

120°

Emergency operation switch (cooling)

Emergency operation switch (heating)

Operation lamp

DEFROST/STAND BY lamp

(WIRELESS PANEL)

Receiver

SLZ-KA50VAQ
SLZ-KA50VAQR1
SLZ-KA50VAQR2

SLZ-KA35VAQ
SLZ-KA35VAQR1
SLZ-KA35VAQR2

SLZ-KA25VAQ
SLZ-KA25VAQR1
SLZ-KA25VAQ2

1/4 F

flared connection

W 6.35mm

1/4 F

flared connection

W 6.35mm

W 9.52mm

flared connection
3/8 F

1/2 F

flared connection

Service ref.

W 6.35mm

flared connection
1/4 F

Refrigerent pipe
(liquid)

Refrigerent pipe
(gas)

W 12.7mm

W 9.52mm

flared connection
3/8 F

Unit : mm

SLZ-KA25VAQ.TH SLZ-KA35VAQ.TH SLZ-KA50VAQ.TH
SLZ-KA25VAQR1.TH SLZ-KA35VAQR1.TH SLZ-KA50VAQR1.TH
SLZ-KA25VAQ2.TH SLZ-KA35VAQR2.TH SLZ-KA50VAQR2.TH

OCH493D

99

WIRED REMOTE CONTROLLER

Unit : mm

PAR-21MAA

PAR-30MAA

130

12083.5

19.5

19

120

120

46

46

83.5

(Option)

OCH493D