Mitsubishi Electric SLZ-KA25VA Technical & Service Manual Download Page 1

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TECHNICAL & SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

CONTENTS

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

2. PART NAMES AND FUNCTIONS ·······3

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

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

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

July 2007

No. OC320

REVISED EDITION-B

REMOTE CONTROLLER

ON/OFF

RESET

TOO

WARM

TOO

COOL

MODE

AUTO COOL

DRY

HEAT

FAN

VANE

SELECT

TIME

Indoor unit
[Model names]

[Service Ref.]

SLZ-KA25VA

SLZ-KA25VA.TH
SLZ-KA25VA

.TH

SLZ-KA35VA

SLZ-KA35VA.TH
SLZ-KA35VA

.TH

SLZ-KA50VA

SLZ-KA50VA.TH
SLZ-KA50VA

.TH

SLZ-KA25VAL

SLZ-KA25VAL.TH
SLZ-KA25VAL

.TH

SLZ-KA35VAL

SLZ-KA35VAL.TH
SLZ-KA35VAL

.TH

SLZ-KA50VAL

SLZ-KA50VAL.TH
SLZ-KA50VAL

.TH

INDOOR UNIT

Model name
indication

ON/OFF

TEMP.

SLZ-KA25,35,50VAL.TH

SLZ-KA25,35,50VAL

.TH

SLZ-KA25,35,50VA.TH

SLZ-KA25,35,50VA

.TH

Revision:
• SLZ-KA25/35/50VA(L)

.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 out-

door 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.

OC320B-1.qxp 07.7.19 8:45 AM Page 1

Summary of Contents for SLZ-KA25VA

Page 1: ...KA35VA TH SLZ KA35VA1 TH SLZ KA50VA SLZ KA50VA TH SLZ KA50VA1 TH SLZ KA25VAL SLZ KA25VAL TH SLZ KA25VAL1 TH SLZ KA35VAL SLZ KA35VAL TH SLZ KA35VAL1 TH SLZ KA50VAL SLZ KA50VAL TH SLZ KA50VAL1 TH INDOOR UNIT Model name indication ON OFF TEMP SLZ KA25 35 50VAL TH SLZ KA25 35 50VAL1 TH SLZ KA25 35 50VA TH SLZ KA25 35 50VA1 TH Revision SLZ KA25 35 50VA L 1 TH are added in REVISED EDITION B Some descrip...

Page 2: ... KA35VAL1 TH SLZ KA50VAL TH SLZ KA50VAL1 TH SLZ KA25VA TH SLZ KA25VA1 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 1 TECHNICAL CHANGES ...

Page 3: ...KA50VA1 TH 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 th...

Page 4: ...utton Fan Speed button Filter button Enter button Test Run button Check button Clear button Airflow Up Down button Louver button Operation button To 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 SL...

Page 5: ...mer 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 but tons have...

Page 6: ...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 3...

Page 7: ...VAL TH SLZ KA25VA TH SLZ KA25VAL1 TH SLZ KA25VA1 TH High Medium 37 SPL dB 31 LINE 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 S...

Page 8: ...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 ...

Page 9: ...te 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 signa...

Page 10: ...10 WIRED REMOTE CONTROLLER Unit mm 130 120 19 43 5 ...

Page 11: ...1 2 3 4 5 6 7 8 9 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 tech...

Page 12: ...hermistor 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 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 ...

Page 13: ... 4 Press the ON OFF button to stop the self check A CHECK button B Address C TEMP button D IC Indoor unit OC Outdoor unit E Check code F Unit No G Timer ON OFF button A F C B B E E D G To delete check code 1 Display the error code on the self check result display screen 2 The address for self check will blink when the G ON OFF button is pressed twice within 3 seconds No trouble generated in the pa...

Page 14: ... Symptom Remark Number of times Wireless remote controller Wired remote controller Beeper sounds OPERATION INDICATOR lamp blinks 1 Check code Number of times Wireless remote controller Wired remote controller 1 P1 Intake sensor error P9 Pipe TH5 sensor error 2 P2 Pipe TH2 sensor error 3 E6 E7 Indoor outdoor unit communication error 4 P4 Drain sensor error 5 P5 Drain pump error 6 P6 Freezing Overhe...

Page 15: ... power terminal block Incorrect wiring between indoor and outdoor units incorrect polarity of S1 S2 S3 Remote controller wire short Note Operation is not possible for about 30 seconds after cancellation of function selection Correct operation For description of each LED LED1 2 3 provided on the indoor controller refer to the following table LED1 power for microcomputer Indicates whether control po...

Page 16: ...ith remote controller in test run mode If pipe liquid temperature is extremely low in cooling mode or high in heating mode refrigerant circuit may have defect 5 Check pipe liquid temperature with remote controller in test run mode If there is extreme difference with actual pipe liquid temperature replace indoor controller board Turn the power off and on again to operate after checking P4 Drain sen...

Page 17: ...ng or drying mode 1 Check clogging of the filter 2 Remove shields 4 Measure the resistance of fan motor s winding Measure the output voltage of fan s connector FAN on the indoor controller board WThe indoor controller board should be normal when voltage of AC 220 240V is detected while fan motor is connected Refer to 7 5 5 Check outdoor fan motor 67 Check operating condition of refrigerant circuit...

Page 18: ...e number of connecting remote con troller max 2 units When the above mentioned problem of 1 3 are not seen 4 Diagnose remote controllers a When RC OK is displayed remote controllers have no problem Turn the power off and on again to check If abnormality generates again replace indoor controller board b When RC NG is displayed replace remote controller c When RC E3 is displayed d When ERC 00 06 is ...

Page 19: ... memory of the remote controller control board Error code E1 2 Abnormal if the clock function of remote controller cannot be normally operated Error code E2 1 Defective remote controller 1 Replace remote controller PA 2502 2500 Forced compressor stop due to water leakage abnormality 1 When the intake temperature subtracted with liquid pipe temperature is less than 10 drain sensor detects whether i...

Page 20: ...lit 1 Mis setting of refrigerant address for outdoor unit There is no unit corresponding to refrigerant address 0 1 Check the setting of refrigerant address for outdoor unit Set the refrigerant address to 0 For grouping control system under which 2 or more outdoor units are connected set one of the units to 0 Set refrigerant address using SW1 3 6 on outdoor controller circuit board 2 LED2 on indoo...

Page 21: ...H 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 CNSK Connect to the indoor controller board CNDK between 1 to 3 220 240V AC CN2S Connect to the indoor controller board CN2D between 1 to 3 12 6 13 7V DC Pin1 ...

Page 22: ... operation SW2 Capacity setting Jumper connector J11 J15 Unit setting CN2L Connector LOSSNAY CN51 Centrally control CN6V Vane motor output MV CN90 Connect to the wireless remote controller board CNB CN31 Drain sensor DS CN29 Condenser evaporator temperature thermistor TH5 CN21 Pipe temperature thermistor Liquid TH2 CN20 Room temperature thermistor TH1 CN22 Remote controller connecting wire 10 4 14...

Page 23: ... the resistance between the terminals with a tester Coil wiring temperature 10 C 30 C Pipe temperature thermistor liquid TH2 Indoor fan motor MF Check method and criterion Part name Normal KA25VA L Normal WHT BLK BLK BLU BLU YLW BRN RED 386 428 81 91 28 32 157 174 KA35VA L 373 413 155 172 44 49 302 335 KA50VA L 308 341 135 151 44 49 293 324 4 3kΩ 9 6k Abnormal Abnormal Opened or short circuited Op...

Page 24: ...temperature thermistor TH5 Thermistor R0 15k 3 Fixed number of B 3480 2 Rt 15exp 3480 0 15k 10 9 6k 20 6 3k 25 5 2k 30 4 3k 40 3 0k Thermistor R0 6 0k 5 Fixed number of B 3390 2 Rt 6exp 3390 0 6 0k 10 3 9k 20 2 6k 25 2 2k 30 1 8k 40 1 3k 60 0 6k Thermistor for lower temperature 1 273 t 1 273 1 273 t 1 273 20 0 20 40 60 80 Thermistor for drain sensor Temperature 0 1 2 3 4 5 6 7 8 9 10 Resistance k ...

Page 25: ...etween the Yellow and Orange connector wires Use a relay of 1W or smaller MB Electromagnetic switch power relay for duct fan X Auxiliary relay 12V DC LY 1F Multiple remote controller adapter PAC SA88HA E Indoor controller board Distance between indoor controller board and relay must be within 10m Be sure to secure insulation material by tape etc 5 Green Yellow Orange Connector 5P Indoor unit side ...

Page 26: ...connector with the plastic tape Vane motor Horizontal vane Connector Unlocking button Vane motor 3 Set the vertical vane of the air outlet by hand slowly within the range in the table below Measured standard position of the grille Horizontal vane Standard of horizontal position Dimension A mm 21 25 28 30 Level 30 Min Downward 45 Downward 55 Downward 70 Max w Dimension between 21 mm and 30 mm can b...

Page 27: ...ille knob 3 Removing the panel 1 Remove the air intake grille Refer to 1 Corner panel See figure 2 1 Remove the screw of the corner 2 Slide the corner panel to the direction of the arrow 3 and remove the corner panel Panel See photo 2 1 Disconnect the connector that connects with the unit 2 Remove the 2 screws from the panel and loose another 2 screws which are fixed to the oval hole have differen...

Page 28: ...d the fan 2 from the indoor controller board 6 Remove the 3 screws fixed to the piping cover and remove the piping cover See photo 9 7 Remove the 6 screws fixed to the flat plate and remove the flat plate 8 Disconnect the lead wires to the direction of the fan motor and remove the 3 nuts of the fan motor Photo 5 6 Removing the drain pan 1 Remove the panel Refer to 3 2 Remove the room temperature t...

Page 29: ...to 9 from the heat exchanger and remove the heat exchanger 9 Removing the drain pump DP and drain sensor DS 1 Remove the panel Refer to 3 2 Remove the drain pan Refer to 6 3 Remove the 2 screws fixed to the control box cover and remove the control box cover 4 Remove the connectors of the CNP and the CN31 from the indoor controller board 5 Remove the 1 screw fixed to the cover and remove the cover ...

Page 30: ...B MV E07 103 003 E07 158 003 E07 103 317 E07 103 037 E07 103 975 E07 103 100 E07 103 010 E07 103 303 E07 103 044 E07 103 031 E07 103 032 AIR OUTLET GRILLE AIR OUTLET GRILLE WIRELSS REMOTE CONTROL BOARD AUTO VANE CORNER PANEL AIR FILTER INTAKE GRILLE VANE MOTOR VANE BUSH GEAR V GEAR M Parts name SLP 2AL SLP 2AA Q ty set PANEL PARTS SLP 2AL FOR SLZ KA25 35 50VAL TH SLP 2AA FOR SLZ KA25 35 50VA TH 1 ...

Page 31: ...5 E07 162 447 E07 164 447 E07 166 447 E07 162 375 E07 156 375 E07 154 440 E02 095 350 FUSE VARISTOR INDOOR CONTROLLER BOARD INDOOR CONTROLLER BOARD INDOOR CONTROLLER BOARD TERMINAL BLOCK TERMINAL BLOCK INDOOR POWER BOARD INDOOR FAN CAPACITOR FUSE ZNR I B I B I B TB4 TB15 P B C1 250V 6 3A 3P S1 S2 S3 2P 1 2 1 5 440VAC 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 SLZ...

Page 32: ...SLZ KA35VAL TH SLZ KA50VAL TH SLZ KA25VA TH SLZ KA35VA TH SLZ KA50VA TH ON OFF RESET TOO WARM TOO COOL MODE AUTO COOL DRY HEAT FAN VANE SELECT TIME 1 2 3 4 5 6 8 9 10 11 13 7 15 19 21 22 17 12 3 23 22 25 20 18 14 24 16 ON OFF TEMP 27 26 ...

Page 33: ...AN MOTOR INDOOR FAN MOTOR FLAT PLATE TURBO FAN SPL WASHER DRAIN PAN ROOM TEMPERATURE THERMISTOR FAN GUARD DRAIN PLUG COIL SUPPORT PIPE TEMPERATURE THERMISTOR LIQUID DRAIN HOSE DRAIN SENSOR SENSOR HOLDER DRAIN PUMP LEG 2 COVER DRUM WIRELESS REMOTE CONTROLLER REMOTE CONTROLLER HOLDER REMOTE CONTROLLER REMOTE CONTROLLER CABLE 1 1 2 1 1 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 MF MF MF TH1 TH5 TH2 DS D...

Page 34: ...3 010 E17 103 303 E17 103 044 E17 103 031 E17 103 032 AIR OUTLET GRILLE AIR OUTLET GRILLE AIR OUTLET GRILLE AIR OUTLET GRILLE WIRELSS REMOTE CONTROL BOARD AUTO VANE AUTO VANE CORNER PANEL CORNER PANEL AIR FILTER INTAKE GRILLE INTAKE GRILLE VANE MOTOR VANE BUSH GEAR V GEAR M Parts name AL SLP 2 AA 1 1 4 4 1 1 4 8 4 4 1 4 4 1 1 4 8 4 4 ALW AAW Q ty set G G G G G G G G G G G G G G G G PANEL PARTS SLP...

Page 35: ...l Recom mended Q ty 1 2 3 4 5 6 7 E17 006 382 E12 661 385 E17 162 447 E17 164 447 E17 166 447 E17 162 375 E17 156 375 E17 154 440 E12 095 350 FUSE VARISTOR INDOOR CONTROLLER BOARD INDOOR CONTROLLER BOARD INDOOR CONTROLLER BOARD TERMINAL BLOCK TERMINAL BLOCK INDOOR POWER BOARD INDOOR FAN CAPACITOR FUSE ZNR I B I B I B TB4 TB15 P B C1 250V 6 3A 3P S1 S2 S3 2P 1 2 1 5 440VAC 1 1 1 1 1 1 1 1 1 1 1 1 1...

Page 36: ...Z KA35VA TH SLZ KA50VA TH SLZ KA25VAL1 TH SLZ KA35VAL1 TH SLZ KA50VAL1 TH SLZ KA25VA1 TH SLZ KA35VA1 TH SLZ KA50VA1 TH ON OFF RESET TOO WARM TOO COOL MODE AUTO COOL DRY HEAT FAN VANE SELECT TIME 1 2 3 4 5 6 8 9 10 11 13 7 15 19 21 22 17 12 3 23 22 25 20 18 14 24 16 ON OFF TEMP 27 26 ...

Page 37: ...PLATE TURBO FAN SPL WASHER DRAIN PAN ROOM TEMPERATURE THERMISTOR FAN GUARD DRAIN PLUG COIL SUPPORT PIPE TEMPERATURE THERMISTOR LIQUID DRAIN HOSE DRAIN SENSOR SENSOR HOLDER DRAIN PUMP LEG 2 COVER DRUM WIRELESS REMOTE CONTROLLER REMOTE CONTROLLER HOLDER REMOTE CONTROLLER REMOTE CONTROLLER CABLE 1 1 2 1 1 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 MF MF MF TH1 TH5 TH2 DS DP W R PK6V15 LD PK6V20 LL PK6V2...

Page 38: ...38 ...

Page 39: ...39 ...

Page 40: ... MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Jul 2007 No OC320 REVISED EDITION B PDF 7 Distributed in Sep 2006 No OC320 REVISED EDITION A PDF 7 Distributed in Feb 2005 No OC320 PDF 8 Made in Japan New publication effective Jul 2007 Specifications subject to change without notice ...

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