TECHNICAL & SERVICE MANUAL SLZ
Contents
1. 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 B4 a LE SH T H2 DP 13 L OUTDOOR mM o 1 UNIT 1 t 7 5 2 ER 1 8 1 8 T 1 6 5 MEG i 513 1802 LED Sy SW 51 sw2 O 1 RU PHASE INTAKE REMOTE 1 EP W RLCONTROLLER A 0 19 WH 7 2 i fig MODELS swe KA25 D 12345 KA35 12345 1 ON Case of wireless model lt _ tee o ag 12345 he black square m indicates a switch position lt 1 gt Case of wired model LEGEND SYMBOL NAME SYMBOL NAME P B INDOOR POWER BOARD C1 CAPACITOR FAN MOTOR INDOOR CONTROLLER BOARD DP DRAIN PUMP CN2L _ CONNECTOR LOSSNAY DS DRAIN SENSOR CN32 CONNECTOR REMOTE SWITCH H2 DEW PREVENTION HEATER CN41 CONNECTOR HA2. Function guide I ackli Operation settings will appear J 7 Function button Fi When the backlight is off pressing any Main display Press to change the operation button turns the backlight on and it mode will stay lit for a certain period of time depending on the screen Main menu Press to move the cursor down 8 Function button F2 Main display Press to decrease temperature 6 ON OFF lamp Main menu Press to move the cursor up This lamp lights up in green while the unit is in operation It blinks while the remote i controller is starting up or when there is I 9 Function button F3 an error Main display Press to increase temperature Main menu Press to go to the previous page p 10 Function button Main display Press to change the fan speed Main menu Press to go to the next page Main menu list Setting and display items Seiting details Lossnay Vane Louver Vent Use to set the vane angle Select a desired vane setting from five 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 op
3. Transmitting error Outdoor unit insufficient refrigerant U1 Ud UD 1 Abnormal high pressure 63H operated Overheating protection operation Wired remote controller Remark Check code Symprom P1 Intake sensor error P2 Pipe TH2 sensor error P9 Pipe TH5 sensor error E6 E7 Indoor outdoor unit communication error P4 Drain sensor error P5 Drain pump error P6 Freezing Overheating protection operation PL Abnormal refrigerant circuit EE Communication error between indoor and outdoor units P8 Pipe temperature error E4 E5 Remote controller signal receiving error Fb FB 1 Indoor unit control system error memory EO E3 Remote controller transmission error E1 E2 Remote controller control board error Errors detected by unit other than indoor unit outdoor unit etc Wired remote controller Check code Symptom Remark E9 Indoor outdoor unit communication error UP Compressor overcurrent interruption U3 U4 Open short of outdoor unit thermistors For details check UF Compressor overcurrent interruption When compressor locked the LED display U2 Abnormal high discharging temperature 49C operated of the outdoor controller board As for outdoor unit refer to U5 Abnormal temperature of heatsink outdoor unit s U8 Outdoor unit fan protection stop service manual U6 Compressor overcurrent interruption Abnorm
4. r 1 Timer indicators ERROR CODE NEHON The indicator comes on if the corre PU al sponding timer is set S AL irc ONLY1Hr WEEKLY al AUTO OFF Ex CICS fy CUNT aggre NI Centrally Controlled indicator obs Indicates that operation from the v remote controller has been prohib ited by a master controller Fan Speed indicator Shows the selected fan speed Up Down Air Direction indica Room Temperature display tor Shows the room temperature The room The indicator shows the direc temperature display range is 8 39 C tion of the outcoming airflow The display blinks if the temperature is less than 8 or 39 C or more Ventilation indicator Appears when the unit is running in Ventilation mode Timer is Off indicator Indicates that the timer is off One Hour Only indicator 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 Louver display Indicates the action of the swing louver Does not appear if the louver is not running Temperature Setting Shows the target temperature Power On indicator Indicates that the power
5. Error Code Abnormal point and detection method Cause Countermeasure Pipe temperature thermistor Condenser Evaporator TH5 The unit is in 3 minute resume protec tion mode if short open of thermistor is detected Abnormal if the unit does not get back to normal within 3 minutes The unit returns to normal operation if it has been reset normally Constantly detected during cooling drying and heating operation except defrosting Short 90 C or more Open 40 C or less Defective thermistor characteristics Contact failure of connector CN29 on the indoor controller board Insert failure Breaking of wire or contact failure of thermistor wiring Temperature of thermistor is 90 C or more or 40 C or less caused by defective refrigerant circuit Defective indoor controller board Check resistance value of thermistor For characteristics refer to P1 above Q Check contact failure of connector CN29 on the indoor controller board Refer to 8 5 Turn the power on and check restart after inserting connector again Operate in test run mode and check pipe lt condenser evaporator gt temperature with outdoor controller circuit board If pipe lt condenser evaporator gt temperature is extremely low in cooling mode or high in heating mode refrigerant circuit may have defect Operate in test run mode and check pipe lt condenser evaporator gt temperature with
6. When LED is lit connect remote controller wires again and if LED2 is blinking remote controller is defective if LED2 is lit connection failure of remote controller terminal block etc has returned to normal 8 5 TEST POINT DIAGRAM 8 5 1 Indoor power board SLZ KA25VAQ TH SLZ KA35VAQ TH SLZ KA50VAQ TH SLZ KA25VAQR1 TH SLZ KA35VAQR1 TH SLZ KA50VAQR1 TH CN2S Connect to the indoor controller board CN2D between to 12 6 13 7V DC fe oWO sive 2 28 tg 2 O M CNSK Connect to the indoor controller board CNDK between to 220 240V AC SLZ KA25VAQ2 TH SLZ KA35VAQR2 TH SLZ KA50VAQR2 TH CN2S Connect to the indoor controller board CN2D between to 12 6 13 7V DC Pin sc oe CNSK Connect to the indoor controller board CNDk between to 220 240V AC OCH493D 20 8 5 2 Indoor controller board 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 CN2D LED1 Connector to the indoor Power supply LED2 LED3 power board CN2S Power supply Transmission 12 5 13 7V DC Indoor outdoor CN3C CN22 Transmission co Remote controller 0 24V DC P 10 4 14 6 DC CN20 Room temperature p thermistor TH1 jl CN
7. Remove blockage Measure the resistance of fan motor s winding Measure the output voltage of fan s connector FAN on the indoor controller board XThe indoor controller board should be normal when voltage of AC 220 240V is detected while fan motor is connected Refer to 8 5 Check outdoor fan motor Check operating condition of refrigerant circuit Heating mode Check clogs of the filter Remove blockage Measure the resistance of fan motor s winding Measure the output voltage of fan s connector FAN on the indoor controller board The indoor controller board should be normal when voltage of AC 220 240V is detected while fan motor is connected Refer to 8 5 Check outdoor fan motor 9 8 Check operating condition of refrigerant circuit Pipe temperature Cooling mode Detected as abnormal when the pipe tem perature is not in the cooling range 3 min utes after compressor start and 6 minutes after the liquid or condenser evaporator pipe is out of cooling range Note 1 It takes at least 9 min to detect Note 2 Abnormality P8 is not detected in drying mode Cooling range 3 deg 2 TH TH1 TH Lower temperature between liquid pipe temperature TH2 and condenser evaporator temperature TH5 TH1 Intake temperature Heating mode When 10 seconds have passed after the compressor starts operation and the hot adjustment mode has finished the unit is
8. If you put force on draw or bend the lead wire with measuring resistance value of thermitor breaking of wire or contact failure can be detected Check contact failure of connector CN20 on the indoor controller board Refer to 8 5 Turn the power back on and check restart after inserting connector again Check room temperature display on remote controller Replace indoor controller board if there is abnormal difference with actual room temperature Turn the power off and on again to operate after checking Pipe temperature thermistor Liquid TH2 The unit is in 3 minute resume prevention mode if short open of thermistor is detected Abnormal if the unit does not reset normally after 3 min utes The unit returns to normal opera tion if it has been reset normally Constantly detected during cooling drying and heating except defrosting operation Short 90 C or more Open 40 C or less Defective thermistor characteristics Contact failure of connector CN21 on the indoor controller board Insert failure Breaking of wire or contact failure of thermistor wiring Defective refrigerant circuit is causing thermistor temperature of 90 C or more or 40 C or less Defective indoor controller board Check resistance value of thermistor For characteristics refer to P1 above 9 Check contact failure of connector CN21 on the indoor controller board Refer to 8 5 Turn t
9. 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 trouble shoot the problem OCH493D 4 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 Display Section For purposes of this explanation all parts of the display are shown During actual operation only the relevant items will be lit 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 Sensor indication Displays when the remote controller sensor is used Locked indicator Indicates that remote controller but tons have been locked switched off is shown Clean The Filter indicator To be displayed on when it is time to clean the filter Identifies the current operation Shows the operating mode etc gt MITSUBISHI ELECTRIC Multilanguage display is available TIME SUN MON TUE WED THU FRI SAT di d Hr AFTER gt 1_ 1_ AFTER
10. 2 screws fixed to the control box cover and remove the control box cover 5 Disconnect the connector of the fan from the indoor con troller board 6 Remove the 3 screws fixed to the piping cover and remove the piping cover See Photo 9 7 Remove the pipe temperature thermistor liquid and condenser evaporator temperature thermistor Refer to Procedure 7 8 Disconnect the lead wires to the direction of the fan motor 9 Remove the 1 coil support screw the 2 inside coil screws See Photo 10 and the 4 outside coil screws See Photo 9 from the heat exchanger and remove the heat exchanger OCH493D 29 Screws of piping cover Piping cover Lead wires Control box Photo 10 Coil screws Coil support Coil support screw Heat exchanger Mir SLIM MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2010 MITSUBISHI ELECTRIC CORPORATION Distributed in Oct 2012 No OCH493 REVISED EDITION D Distributed in Feb 2012 No OCH493 REVISED EDITION C Distributed in Dec 2011 No OCH493 REVISED EDITION B Distributed in Mar 2011 No OCH493 REVISED EDITION A Distributed in Dec 2010 No OCH493 Made in Japan New publication effective Oct 2012 Specifications are subject to change without notice
11. C 40 C 15kO 9 6 6 3kQ 5 2 4 3kQ 3 0kQ Thermistor for drain sensor Thermistor Ro 6 0kKQ 5 Fixed number of B 3390 2 Rt 6exp 3390 1 _1 __ 2734t 273 oc 10 20 25 C 30 C 40 C 60 C 6 0 3 9kO 2 6kQ 2 2kQ 1 8kQ 1 3kQ 0 6kQ OCH493D 24 Resistance kQ Resistance kQ lt Thermistor for lower temperature gt 20 10 0 10 20 30 40 50 Temperature Thermistor for drain sensor gt 20 0 20 40 60 80 Temperature 9 4 WAY AIR FLOW SYSTEM 9 1 FRESH AIR INTAKE LOCATION FOR INSTALLATION At the time of installation use the duct holes cut out located at the positions shown in following diagram as and when required Fresh air intake 1 Drain pipe Electrical Box Refrigerant pipe Unit mm Detail drawing of fresh air intake 100 25 73 4 Cut out hole Ceiling surface 9 2 FRESH AIR INTAKE AMOUNT
12. TERMINAL A MF FAN MOTOR WITH THERMAL FUSE CN51 CENTRALLY CONTROL MV VANE MOTOR FUSE _ FUSE T6 3AL250V TB4 TERMINAL BLOCK LED1 POWER SUPPLY INDOOR OUTDOOR CONNECTING LINE LED2 POWER SUPPLY TB15 TERMINAL BLOCK REMOTE CONTROLLER LED3__ TRANSMISSION INDOOR OUTDOOR TRANSMISSION LINE sw2 SWITCH CAPACITY CODE TH1 ROOM TEMP THERMISTOR SW3 SWITCH MODE SELECTION 0 C 15kQ 25 C 5 4 DETECT SWE SWITCH EMERGENCY OPERATION TH2 PIPE TEMP THERMISTOR LIQUID x1 DRAIN PUMP DEW PREVENTION HEATER 0 C 15 25 C 5 4 DETECT X4 RELAY FAN MOTOR LL TH5 COND EVA TEMP THERMISTOR X5 RELAY FAN MOTOR Lo 0 C 15kQ 25 C 5 4 DETECT X6 RELAY FAN MOTOR Hi OPTION PART X7 RELAY FAN MOTOR Me R B WIRED REMOTE CONTROLLER BOARD W B WIRELESS REMOTE CONTROLLER BOARD TB6 TERMINAL BLOCK REMOTE CONTROLLER RU RECEIVING UNIT TRANSMISSION LINE BZ BUZZER LED1 LED RUN INDICATOR LED2 LED HOT ADJUST SW1 SWITCH HEATING ON OFF Sw2 SWITCH COOLING ON OFF 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 are made with polarities make wiring matching terminal numbers S1 S2 S3 3 Symbols used in wiring diagram above are o oJ Connector Terminal block For details on how to operate self diagnosis refer to the technical manuals etc OCH
13. detected as abnormal when condenser evaporator pipe temperature is not in heat ing range within 20 minutes Note 3 It takes at least 27 minutes to detect abnormality Note 4 It excludes the period of defrosting Detection restarts when defrosting mode is over Heating range 3 deg TH5 TH1 OCH493D Slight temperature difference between indoor room temperature and pipe lt liquid or condenser evaporator gt temperature thermistor Shortage of refrigerant Disconnected holder of pipe liquid or condenser evaporator thermistor Defective refrigerant circuit Converse connection of extension pipe on plural units connection G Converse wiring of indoor outdoor unit connecting wire on plural units connection Defective detection of indoor room temperature and pipe condenser evaporator temperature thermistor Stop valve is not opened completely 15 Check pipe liquid or condenser Check converse connection of extension pipe or converse wiring of indoor outdoor unit connecting wire evaporator temperature with room temperature display on remote controller and outdoor controller circuit board Pipe liquid or condenser evaporator temperature display is indicated by setting SW2 of outdoor controller circuit board as follows controller circuit board after connecting Conduct temperature check with outdoor A Control Service Tool PAC SK52ST
14. is on Operation Section ON OFF button Fan Speed button Temperature setting buttons Cv Down A Up Timer Menu button Monitor Set button C MITSUBISHI ELECTRIC Filter 41 button lt Enter gt button Test Run button Check button Clear button Mode button Return button Temp CA 1 _ Cisse OMENU ON OFF FILTER C 6 Nf CS Ja PES CA Ahgad BACK MONITOR SET DAY CHECK TEST A CLOCK V OPERATION A CLEAR Set Time buttons _ Airflow Up Down button Louver button VY Operation button To return operation number Ventilation button A Operation button To go to next operation number PAR 21MAA Timer On Off button Set Day button Opening the cover AN Built in temperature sensor OCH493D 5 SPECIFICATIONS Indoor 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 Function Cooling Heating Cooling Heating Cooling Heating Cooling Heating Power supply Single
15. lt ela Os E 1 i Air intake grille 7 5 9 7 vane motor 35 55 377 Air intake hole OCH493D SLZ KA50VAQ TH SLZ KA50VAQR1 TH SLZ KA50VAQR2 TH Unit mm Detail drawing of fresh air intake 100 3 2 8 hole Burring hole Ceiling surface Wiring entry 25 T z gt A WIRELESS PANEL Operation lamp Receiver Pe oe Emergency operation switch cooling Emergency operation switch heating Service ref Refrigerent pipe Refrigerent pipe liquid gas SLZ KA25VAQ 6 35 9 52mm SLZ KA25VAQR1 flared connection flared connection SLZ KA25VAQ2 1 4 F 3 8 F SLZ KA35VAQ 6 35mm 9 52mm SLZ KA35VAQA1 flared connection flared connection SLZ KA35VAQR2 1 4 3 8F SLZ KA50VAQ 6 35mm 12 7 SLZ KA50VAQA1 flared connection flared connection SLZ KA50VAQR2 1 4 1 2 WIRED REMOTE CONTROLLER Option PAR 21MAA PAR 30MAA OCH493D 130 MITSUBISHI ELECTRIC Unit mm 19 EM 6 WIRING DIAGRAM
16. 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 O Set refrigerant address using SW1 3 6 on outdoor controller circuit board 2 LED2 on indoor controller board is blinking OCH493D When LED1 on indoor controller board is also blinking Connection failure of indoor outdoor unit connecting wire When LED1 is lit Miswiring of remote controller wires Under twin indoor unit system 2 or more indoor units Refrigerant address for outdoor unit is wrong or not set Under grouping control system there are some units whose refrigerant address is 0 Short cut of remote controller wires Defective remote controller 19 Check indoor outdoor unit connecting wire for connection failure Check the connection of remote controller wires in case of twin triple indoor unit system When 2 or more indoor units are wired in one refrigerant System connect remote controller wires to one of those units Check the setting of refrigerant address in case of grouping control system If there are some units whose refrigerant addresses are 0 in one group set one of the units to 0 using SW1 3 6 on out door controller circuit board Remove remote controller wires and check LED2 on indoor controller board e When LED2 is blinking check the short cut of remote controller wires
17. phase 230V 50Hz Single phase 230V 50Hz Single phase 230V 50Hz Single phase 230V 50Hz Capacity Air flow High Medium Low 600 540 480 660 540 480 660 540 480 660 540 480 Electrical Power outlet 10 10 10 20 Running current 1 0 35 0 40 0 40 0 65 Power input Rated frequency 75 85 85 85 Dew prevention heater 0 014 0 014 0 014 0 014 Power factor 1 90 93 94 94 94 94 97 97 Fan motor current 1 0 19 0 26 0 26 0 27 Model PK6V15 LD PK6V20 LL PK6V20 LL PK6V20 LM Winding resistance at 26 C WHT BLK 407 BLK BLU 86 BLU YLW 30 BRN RED 165 WHT BLK 393 BLK BLU 164 BLU YLW 47 BRN RED 319 WHT BLK 393 BLK BLU 164 BLU YLW 47 BRN RED 319 WHT BLK 325 BLK BLU 143 BLU YLW 47 BRN RED 309 Dimensions Width UNIT 570 22 7 16 PANEL 650 25 9 16 Height UNIT 235 9 1 4 PANEL 20 13 16 Depth UNIT 570 22 7 16 PANEL 650 25 9 16 Weight UNIT 16 5 PANEL 3 Air direction 4 4 4 4 Sound level High Medium Low 37 31 28 38 33 29 38 33 29 39 34 30 Fan speed High Medium Low 650 530 480 690 570 510 690 570 510 710 590 530 Fan speed regulator 3 3 3 3 Thermistor TH1 at 25 C 10 10 10 10 Thermistor
18. state will not be released until the main power is reset OCH493D Drain pump trouble Drain defective Drain pump clogging Drain pipe clogging Open circuit of drain sensor side heater Contact failure of drain sensor connector Dew condensation on drain sensor Drain water trickles along lead wire Drain water waving due to filter clogging Extension piping connection difference at twin triple quadruple system Miswiring of indoor outdoor connecting at twin triple quadruple system Room temperature thermistor liquid pipe temperature themistor detection is defective 18 Check the drain pump Performance Please check whether water can be drained Check the resistance of the drain sensor side heater Check the connector contact failure Check the drain sensor lead wire mounted Check the filter clogging amp Check the piping connection Check the indoor outdoor connecting wires Check the room temperature display of remote controller Check the indoor liquid pipe temperature display of outdoor controller board 8 4 TROUBLESHOOTING OF PROBLEMS Phenomena Note Refer to the manual of outdoor unit for the detail of remote controller Cause Countermeasure 1 LED2 on indoor controller board is off When LED1 on indoor controller board is also off Power supply of rated voltage is not supplied to out door unit D
19. 096 and 50 to 9096 in 1096 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 fixed 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 sett
20. 1 Power 9 Pipe temperature supply input SES thermistor Liquid TH2 208 230V AC j z Ek CN29 do gy Condenser evaporator 5 o 60228 lt temperature thermistor TH5 FUSE X wr iB 6 3A 250V ils 8238 Drain sensor DS CNDK E Connect to the 5 e 4 Connect to the wire indoor power 2 less remote controller board CNSK board CNB 208 230V AC E CN6V CNP 3 pm motor output MV Drain pump leri output DP CN41 208 230V AC d Connector 0 terminal A CNC TO CN24 o 00 Dew prevention CN105 heater H2 CN92 208 230V AC is CN51 RJ Centrally control SUNL P 0 0 Control signal e 13V pulse input Y Operation indicator 13VDC Malfunction indicator 2 13VDC gt 2 FAN CN2L Fan motor output Connector LOSSNAY Jumper connector SW3 SWE SW2 J11 J15 Mode selection Emergency operation Capacity setting Unit setting OCH493D 21 8 6 FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the dip switch on control P C board Model setting and capacity setting are memorised in the nonvolatile memory of the indoor controller board The black square indicates a switch position Functions Setting by the dip switch and jumper wire Remarks Capacity setting M
21. 493D 10 7 REFRIGERANT SYSTEM DIAGRAM 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 Strainer 50 Heat exchanger lar Condenser evaporator temperature thermistor TH5 Refrigerant GAS pipe connection e Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection Flare LL Pipe temperature Room temperature thermistor liquid thermistor TH1 TH2 Distributor d with strainer 50 OCH493D 11 8 TROUBLESHOOTING 8 1 CAUTIONS ON TROUBLESHOOTING 1 Before troubleshooting check the followings Check the power supply voltage Check that the indoor outdoor connecting wire is correct 2 Take care of the followings during servicing Before servicing the air conditioner be sure to turn off the remote controller first to stop the main unit and then turn off the breaker When removing the indoor controller board hold the edge of the board with care NOT to apply stress on the components When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires X e 3 Lead wire Housing point 8 2 MALFUNCTION DIAGNOSIS METHOD BY REMOTE CONTROLLER Errors detected by indoor unit
22. MITSUBISHI ELECTRIC SPLIT TYPE HEAT PUMP AIR CONDITIONERS Changes for the Better October 2012 No OCH493 REVISED EDITION D TECHNICAL amp SERVICE MANUAL Series SLZ Ceiling Cassettes Indoor unit Model names Service Ref we SLZ KAZ5VAQ TH ous SLZ KA25VAQR1 TH sz ewe SLZ KA25VAQ2 TH R410A evision SLZ KA35VAQ SLZ KA35VAQ TH Please void OCH493 SLZ KA35VAQR1 TH SLZ KA35VAQR2 TH SLZ KA50VAQ SLZ KA50VAQ TH Flease REVISED EDITION C SLZ KA50VAQR1 TH SLZ KA50VAQR2 TH WIRED REMOTE CONTROLLER Option CONTENTS 1 TECHNICAL CHANGES 2 2 REFERENCE SERVICE MANUAL 2 3 PART NAMES AND FUNCTIONS 2 ESPEGIEICATIONSES RR 6 5 OUTLINES AND DIMENSIONS 8 6 WIRING DIAGRAM enn 10 7 REFRIGERANT SYSTEM DIAGRAM 11 8 TROUBLESHOOTING 12 9 4 WAY AIR FLOW SYSTEM 25 10 DISASSEMBLY PROCEDURE 27 PARTS CATALOG OCB493 Mir SLIM Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products We will not be held responsible for mechanical failure system malfunction u
23. NOTCH SPL dB LINE NOTCH sPL dB LINE SLZ KA25VAQR1 TH Hig 37 High_ 38 d Medium 31 4 SLZ KA35VAQR1 TH Medium 33 4 ow 28 1 4 OW 29 1 4 SLZ KA35VAQR2 TH 90 q a 90 1 T A 2 80 80 N N 2 2 S S 70 70 a a o a ta 5 60 9 60 gt gt 4 4 50 50 2 J eo 7 o ao a 40 40 z 2 o N 9 30 lt lt m m F w ul i gt I i gt I I 20 TumesHoLD oF gt E 20 EOM oe o ae ae aL i gt CONTINUOUS g x JNC 20 3 NOISE i I i 1 NOISE i HE i Y 10 i T 10 T i 63 125 250 500 1000 2000 4000 8000 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz BAND CENTER FREQUENCIES Hz lt 50Hz gt SLZ KA50VAQ TH NOTCH SPL dB LINE High 39 o o SLZ KA50VAQR1 TH Medium SLZ KA50VAQR2 TH Low 30 UNIT 90 EE 5 i i i i E CEILING 2 80 I 1 1 x t T i F i i I e a ee 22225 lt a I dde L Ae ae 3 a T 60 1 5 gt 4 5 50 MICROPHONE a 40 g o 2 30 lt a 2 APPROXIMATE 5 20 THRESHOLD OF o HEARING FOR CONTINUOUS NOISE 10 18 gt I 1 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES Hz NOTE The sound level is measured in an anechoic room where echoes are few when compressor stops The sound may be bigger than the indi
24. Refer to Procedure 2 Photo 4 Connectors Control box Drain plug Scre Room temperature thermistor TH1 gt M i Drain pan 6 Screw Fan guard Removing the pipe temperature thermistor liquid TH2 and condenser evaporator temperature thermistor TH5 1 Remove the panel Refer to Procedure 3 2 Remove the drain pan Refer to Procedure 6 3 Disconnect the indoor coil thermistor from the holder 4 Remove the 3 screws fixed to the piping cover and remove the piping cover See Photo 9 5 Remove the 2 screws fixed to the control box cover and remove the control box cover Pipe temperature thermistor liquid TH2 6 Remove the connector CN21 from the indoor controller board and disconnect the pipe temperature thermistor liquid Condenser evaporator temperature thermistor TH5 6 Remove the connector CN29 from the indoor controller board and disconnect the condenser evaporator temperature thermistor Photo 5 Control box Pipe temperature thermistor liquid TH2 Condenser evaporator temperature thermistor TH5 Removing the fan motor MF 1 Remove the panel Refer to Procedure 3 2 Remove the drain pan Refer to Procedure 6 3 Remove the nut and the washer from the turbo fan and remove the turbo fan 4 Remove the 2 screws fixed to the control box cover and remove the control box cover 5 Disconnect the connectors of the fan 1 and the fan 2 from
25. Set temp Auto 21 2 5 Basic mode 2 14 38 Fri 3 Cool Set temp Auto All icons are displayed for explanation The main display can be displayed in two different modes Full and Basic Appears when the buttons are locked 13 1 Operation mode Indoor unit operation mode appears here 2 Preset temperature Preset temperature appears here Appears when the On Off timer or Night setback function is enabled 3 Clock Us en See the Installation Manual Appears when the Weekly timer is enabled 115 Q Current time appears here I 4 Fan speed Fan speed setting appears here Appears while the units are operated in the energy save mode 5 Button function guide p 16 Sy BO Functions of the corresponding buttons appear Appears while the outdoor units are operated in s the silent mode p pm ee the ON OFF operation is centrally Wher he controlled 5 remote controller is activated to monitor the 1 7 eis room temperature a Appears when the operation mode is centrally 15 appears when the thermistor on the controlled indoor unit is activated to monitor the room 13 Qj temperature Appears when the preset temperature is centrally I 18 o controlled Indicates the vane setting 1 amp Appears when the filter reset function is centrally controlled Indicates the louver setting U
26. TH2 at 25 C 10 10 10 10 Thermistor TH5 at 25 C 10 NOTE Test conditions are based on ISO 5151 10 10 10 Cooling Indoor D B 27 C W B 19 C Outdoor D B 35C W B 24 C Heating Indoor D B 20C W B 15 Outdoor D B 7C 6C Refrigerant piping length one way 5 m 1 Measured under rated operating frequency Specifications and rating conditions of main electric parts INDOOR UNIT Service ref SLZ KA25VAQ TH SLZ KA25VAQR1 TH SLZ KA25VAQ2 TH SLZ KA35VAQ TH SLZ KA35VAQR1 TH SLZ KA35VAQR2 TH 1 5uF 440V 250V 6 3A MSBPC20 12V 2500 TO OUTDOOR UNIT TO WIRED REMOTE CONTROLLER 2P 141C 3C 240V AC 15W SLZ KA50VAQ TH SLZ KA50VAQR1 TH Item SLZ KA50VAQR2 TH Indoor fan capacitor Fuse Vane motor Terminal block Indoor fan motor thermal fuse Cord Heater OCH493D 6 NOISE CRITERION CURVES lt 50 2 gt SLZ KA25VAQ2 TH lt 50 2 gt SLZ KA25VAQ TH
27. al of power module U7 Abnormality of superheat due to low discharge temperature U9 UH Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit Current sensor error Others Other errors Refer to the technical manual for the outdoor unit 1 The check code in the parenthesis indicates PAR 30MAA model continued to the next page OCH493D 12 On wired remote controller Check code displayed in the LCD If the unit cannot be operated properly after the test run refer to the following table to find out the cause Symptom Wired remote controller Cause PLEASE WAIT For about 2 minutes after power on For about 2 minutes after power on operation of the remote controller is not possible due to system start up Correct operation PLEASE WAIT Error code Subsequent to about 2 minutes after power on No messages appear even when operation switch is turned ON operation lamp does not light up Connector for the outdoor unit s protection device is not connected Reverse or open phase wiring for the outdoor unit s 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 th
28. amp STATIC PRESSURE CHARACTERISTICS 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 Taking air into the unit Static pressure P Pa How to read curves Duct characteristics Curve inthe at site Q Designed amount of fresh air intake 50 Air flow Q m min 9 LP ENS lt m3 min gt 0 5 1 0 1 5 20 25 30 35 0 M A Static pressure loss of fresh air 0 intake duct system with air flow amount Q Pa 50 B Forced static pressure at air condi tioner inlet with air flow amount Q 100 lt gt C Static pressure of booster fan with 150 air flow amount Q Pa ul D Static pressure loss increase 200 Q amount of fresh air intake duct 250 system for air flow amount Q Pa E Static pressure of indoor unit with 300 air flow amount Q lt Pa gt NOTE Fresh air intake amount should be 20 or less of whole air amount to prevent dew dripping Qa Estimated amount of fresh air 9 3 OPERATION IN CONJUNCTION WITH DUCT FAN BOOSTER FAN e Whenever the indoor unit operates the duct fan operates 1 Connect the optional multiple remote controller adapter PAC SA88HA E to the connector CN51 on the indoor controller board 2 Drive the relay after connecting the 12V DC relay between the Yellow and Orange c
29. cated 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 OCH493D 7 5 OUTLINES AND DIMENSIONS SLZ KA25VAQ TH SLZ KA25VAQR1 TH SLZ KA25VAQ2 TH SLZ KA35VAQ TH SLZ KA35VAQR1 TH SLZ KA35VAQR2 TH eo D 3 Fresh air x intake N 2 2 530 8 5 Suspension bolt 3 m 200 Z y rol Sd n eic wo e S18 TUS Cice te S 5 ite 5 N 7 1 570 N J Nur ee D y 1 oo ceo I a 26 o 199 352 335 576 620 Ceiling hole 15 37 ri Refrigerent Drain pi ipe gas rain pipe 4 VP 25 connection Refrigerent O D 32 pipe liquid amp o PRESS Suspension bolt M10 or 3 8 Terminal block 38 58 Suspension bolt lower edge T Grille Ceili Terminal block Ing surtace Case of Wired remote controller procure locally Wo O N N DEFROST STAND BY lamp 650 J 301 A Brand label Air outlet hole Grille B VM Drain hole X Sz mmm ae M Auto vane o o 2 2 HIS
30. e indoor controller refer to the following table LED1 power for microprocessor always lit Indicates whether control power is supplied Make sure that this LED is LED2 power for wired remote controller Indicates whether power is supplied to the wired remote controller This LED lights only in the case of the indoor unit which is connected to the outdoor unit refrigerant address 0 LED3 communication between indoor and Indicates state of communication between the indoor and outdoor units outdoor units Make sure that this LED is always blinking OCH493D 13 Note Refer to the manual of outdoor unit for the details of display such as F U and other E 8 3 SELF DIAGNOSIS ACTION TABLE Error Code Abnormal point and detection method Cause Countermeasure Room temperature thermistor TH1 The unit is in 3 minute resume prevention mode if short open of thermistor is detected Abnormal if the unit does not reset normally after 3 minutes The unit returns to normal operation if it has been reset normally Constantly detected during cooling drying and heating operation Short 90 C or more Open 40 C or less Defective thermistor characteristics Contact failure of connector CN20 on the indoor controller board Insert failure Breaking of wire or contact failure of thermistor wiring Defective indoor controller board Check resistance value of thermistor
31. efective outdoor controller circuit board Power supply of 220 240V is not supplied to indoor unit Defective indoor power board Defective indoor controller board D Check the voltage of outdoor power supply terminal block L N or Ls N When AC 220 240V is not detected check the power wiring to outdoor unit and the breaker When AC 220 240V is detected check below Check the voltage between outdoor terminal block S1 and S2 When AC 220 240V is not detected check the fuse on outdoor controller circuit board check the wiring connection When AC 220 240V is detected check below Check the voltage between indoor terminal block S1 and S2 When AC 220 240V is not detected check indoor outdoor unit connecting wire for miswiring When AC 220 240V is detected check below Check voltage output from CN2S on indoor power board DC13 1V Refer to 8 5 When no voltage is output check the wiring connection When output voltage is between DC12 5V and DC13 7V check amp below Check the wiring connection between indoor controller board and indoor power board Check the fuse on indoor controller board If no problems are found indoor controller board is defective When LED1 on indoor controller board is lit Mis setting of refrigerant address for outdoor unit There is no unit corresponding to refrigerant address 0 Check the setting
32. efrigerant circuit or replace refrigerant Remote controller transmission error EO signal receiving error E4 Abnormal if main or sub remote con troller cannot receive any transmission normally from indoor unit of refrigerant address 0 for 3 minutes Error code EO Abnormal if sub remote controller could not receive for any signal for 2 minutes Error code EO Q Abnormal if indoor controller board cannot receive normally any data from remote controller board or from other indoor controller board for 3 minutes Error code E4 Indoor controller board cannot receive any signal from remote controller for 2 minutes Error code E4 OCH493D Contact failure at transmission wire of remote controller All remote controllers are set as sub remote controller In this case EO is displayed on remote controller and E4 is displayed at LED LED1 LED2 on the outdoor controller circuit board G Miswiring of remote controller Defective transmitting receiving circuit of remote controller Defective transmitting receiving circuit of indoor controller board of refrigerant address 0 amp Noise has entered into the transmission wire of remote controller 16 Check disconnection or looseness of indoor unit or transmission wire of remote controller Set one of the remote controllers main if there is no problem with the action above G Check wiring of remote controller To
33. eration 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 filter status The filter 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 specified 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
34. g converse wiring of indoor outdoor unit connecting wire Defective transmitting receiv ing circuit of indoor controller board Defective transmitting receiving circuit of indoor controller board Noise has entered into indoor outdoor unit connecting wire Check disconnection or looseness of indoor outdoor unit connecting wire of indoor unit or outdoor unit Check all the units in case of twin indoor unit system Turn the power off and on again to check If abnormality generates again replace indoor controller board or outdoor controller circuit board Other indoor controller board may have defect in case of twin indoor unit system Indoor outdoor unit communication error Transmitting error Abnormal if 1 receiving is detected 30 times continuously though indoor controller board has transmitted 0 Defective transmitting receiving circuit of indoor controller board Noise has entered into power supply Noise has entered into outdoor control wire Turn the power off and on again to check If abnormality generates again replace indoor controller board Indoor controller board Abnormal if data cannot be normally read from the nonvolatile memory of the indoor controller board Defective indoor controller board Replace indoor controller board The check code in the parenthesis indicates PAR 30MAA model Remote controller control board Abno
35. g protection Cooling mode The unit is in 6 minute resume prevention mode if pipe lt liquid or condenser evap orator gt temperature stays under 15 C for 3 minutes after the compressor start ed Abnormal if it stays under 15 C for 3 minutes again within 16 minutes after 6 minute resume prevention mode Overheating protection Heating mode The units is in 6 minute resume pre vention mode if pipe condenser evaporator temperature is detected as over 70 C after the compressor started Abnormal if the temperature of over 70 C is detected again within 10 min utes after 6 minute resume prevention mode Cooling or drying mode Q Clogged filter reduced airflow Short cycle of air path Low load low temperature operation out of the tolerance range Defective indoor fan motor Fan motor is defective Indoor controller board is defective Defective outdoor fan control Overcharge of refrigerant Defective refrigerant circuit clogging Heating mode Clogged filter reduced airflow Short cycle of air path Overload high temperature operation out of the tolerance range Defective indoor fan motor Fan motor is defective Indoor controller board is defective Defective outdoor fan control Overcharge of refrigerant C Defective refrigerant circuit clogging Bypass circuit of outdoor unit is defective Cooling or drying mode Check clogging of the filter
36. he power on and check restart after inserting connector again Check pipe liquid temperature with 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 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 Drain sensor DS Suspensive abnormality if short open of thermistor is detected for 30 seconds continuously Turn off compressor and indoor fan Short open is detected for 30 seconds continuously during suspensive abnormality The unit returns to normal operation if it has been reset normally Detect the following condition During cooling and drying operation In case that pipe liquid temperature room temperature 10 deg Except defrosting When pipe liquid temperature or room temperature is short open temperature During drain pump operation Defective thermistor characteristics Contact failure of connector CN31 on the indoor controller board Insert failure G Breaking of wire or contact failure of drain sensor wiring Defective indoor controller board G Check resistance value of thermistor 1 3kQ Check contact failure of connector CN31 on the indoor contr
37. ing is valid only when indoor units with the AUTO mode function are connected Administrator pass The administrator password is required to make the settings for the following items word 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 e 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
38. low o direction Horizontal 30 Downward 45 Downward 55 Downward 70 A 21mm 25 mm 28 mm 30 mm The vanes can be set between 21mm and 30 mm A Caution Do not set the up down vanes passed the specified range Condensation could form and drop from the ceiling or the unit could malfunction OCH493D 26 10 SLZ KA25VAQ TH SLZ KA35VAQ TH SLZ KA25VAQR1 TH SLZ KA35VAQR1 TH SLZ KA25VAQ2 TH SLZ KA35VAQR2 TH OPERATING PROCEDURE DISASSEMBLY PROCEDURE SLZ KA50VAQ TH SLZ KA50VAQR1 TH SLZ KA50VAQR2 TH Be careful when removing heavy parts PHOTOS amp ILLUSTRATIONS 1 Removing the air intake grille 1 Slide the knob of air intake grille to the direction of the arrow to open the air intake grille 2 Remove the string hook from the panel to prevent the grille from dropping 3 Slide the hinge of the intake grille to the direction of the arrow and remove the air intake grille Figure 1 Air intake grille 2 Removing the fan guard 1 Open the air intake grille 2 Remove the 3 screws of fan guard lt Air intake grille 3 Removing the panel 1 Remove the air intake grille Refer to Procedure 1 Corner panel See Figure 2 1 Remove the screw of the corner 2 Slide the corner panel to the direction of the arrow and remove the corner panel Panel See Photo 2 1 Disconnect the connector that connects with the unit 2 Remove the 2 screws f
39. mal KA25VAQ KA25VAQ2 KA50VAQ WHT BLK 386 4280 373 4130 308 3410 BLK BLU 81 910 155 1720 135 1510 BLU YLW 28 32Q 44 490 44 490 BRN RED 157 1740 302 3350 293 3240 Opened or short circuited B Thermal fuse 141 3 C Vane motor MV Measure the resistance between the terminals with a tester At the ambient temperature 20 C 30 C Connector Normal Abnormal Red Yellow Red Blue Red Orange Red White Open or short Blue Yellow Drain pump DP Measure the resistance between the terminals with a tester Relay At the ambient temperature 20 C 30 C connector Yellow 1 Normal Abnormal 2900 Open or short Ye llow Measure the resistance between the terminals with a tester Measure the resistance after 3 minutes have passed since the power supply was intercepted At the ambient temperature 0 C 60 C Drain sensor DS Normal Abnormal WV 0 6kQ 6 0kQ Open or short Refer to the next page for a detail OCH493D 23 lt Thermistor Characteristic graph gt Thermistor for lower temperature Room temperature thermistor TH1 Pipe temperature thermistor liquid TH2 Condenser evaporator temperature thermistor TH5 Thermistor Ro 15kQ 396 Fixed number of B 3480 2 Rt 15exp 3480 _1 2734 273 oc 10 20 25 C 30
40. nit breakdown or accidents caused by failure to follow the instructions 1 TECHNICAL CHANGES 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 KAS50VAQR1 TH TURBO FAN and WASHER have been changed 2 REFERENCE SERVICE MANUAL 2 1 OUTDOOR UNIT S SERVICE MANUAL 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 OCHS530 OCB530 2 2 TECHNICAL DATA BOOK Series Outdoor unit Data Book No SUZ KA VA OCSO03 SUZ KA VAH SUZ KA VA3 3 PART NAMES AND FUNCTIONS 3 1 Indoor unit Horizontal Air Outlet Sets horizontal airflow automatically during cooling or dehumidifying Removes dust and pollutants from drawn in air Auto Air Swing Vane Disperses airflow up and down and adjusts the angle of airflow direction Draws in air from room OCH493D 2 3 2 Wired remote controller Option PAR 30MAA The functions which can be used are restricted according to the model Display The factory setting is Full 13 15 Full mode 12 14 16 17 18 Room 28 C e acai 20 Cool
41. o B 120 R Indicates when filter needs maintenance m Indicates the ventilation setting B Room temperature 121 See the Installation Manual Appears when the preset temperature range is Current room temperature appears here restricted Controller interface afa MITSUBISHI ELECTRIC 5 6 eo e 4 3 2 1 Function buttons When the backlight is off pressing any button turns the backlight on and does not perform its function except for the button Most settings except ON OFF mode fan speed temperature can be made from the Menu screen OCH493D 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 I 1 ON OFF button Press to turn ON OFF the indoor unit I 2 SELECT button Press to save the setting RETURN button Press to return to the previous screen 4 MENU button Press to bring up the Main menu Main Mainmenu V3 Vane Louver Vent Lossnay High power Timer Weekly timer OU silent mode Main display 14 38 Fri Room 28 Settemp Auto p IRo 1
42. odels Setting SLZ KA25VAQ SLZ KA25VAQ 2 SLZ KA35VAQ SLZ KA50VAQ Function setting Dip switch Function Action by switch opration OFF ON SW3 1 Power failure automatic recovery OFF ON SW3 2 Set temperature in heating mode 4 deg up Available Not available SW3 3 Fan speed when the thermostat is OFF during heating mode Extra low Stop SW3 4 SW3 5 SW3 function Not available Available Function setting becomes effective when the Dip switch SW3 5 is ON Switch off SW3 5 when the function setting is done by wired remote controller OCH493D 22 Initial setting 8 7 TROUBLE CRITERION OF MAIN PARTS 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 Part name Check method and criterion Room temperature Measure the resistance with a tester thermistor Part temperature 10 C 30 C TH1 Pipe temperature thermistor liquid TH2 Condenser evaporator temperature thermistor TH5 Normal Abnormal 4 3kQ 9 6kQ Opened or short circuited Indoor fan motor Measure the resistance between the terminals with a tester Coil wiring temperature 10 C 30 C Normal KA35VAQ Abnor
43. oller board Refer to 8 5 Turn the power back on and check restart after inserting connector again Replace indoor controller board if drain pump operates with the line of drain sensor connector CN31 and is short circuited and abnormality reappears Turn the power off and on again to operate after checking Malfunction of drain pump DP Suspensive abnormality if thermistor of drain sensor heats itself and temperature rises slightly Turn off compressor and indoor fan Drain pump is abnormal if the condition above is detected during suspensive abnormality Constantly detected during drain pump operation OCH493D C Malfunction of drain pump Defective drain Clogged drain pump Clogged drain pipe Attached drop of water at the drain sensor Drops of drain trickles from lead wire Clogged filter is causing wave of drain Defective indoor controller board 14 Check if drain pump works Check drain function Check the setting of lead wire of drain sen sor and check clogs of the filter Replace indoor controller board if drain pump operates with the line of drain sensor connector CN31 and is short circuited and abnormality reappears Refer to 8 5 Turn the power off and on again to operate after checking Error Code Abnormal point and detection method Cause Countermeasure Freezing overheating protection is oper ating Freezin
44. onnector wires Use a nonpolar 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 OCH493D intake without D ms min Q a Qa Be sure to secure insulation Bi material by tape etc Dre sse i CN51 5 Green on Yellow gt X est p Orange indoor unit lt board 1 Connector 5P Indoor unit side Installation at site I Multiple remote gt controller adapter Be sure to secure insulation PAC SA88HA E material by tape etc Indoor controller board O Distance between indoor controller board and relay must be within 10m 9 4 FIXING HORIZONTAL VANE Horizontal vane of each air outlet can be fixed according to the environment where it is installed Setting procedure 1 Turn off a main power supply Turn off a breaker 2 Remove the vane motor connector in the direction of the arrow shown below with pressing the unlocking button as in the figure below Insulate the disconnected connector with the plastic tape Vane motor a Connector Unlocking button Vane motor Horizontal vane 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 4 A Horizontal vane lt Specified range gt Up down airf
45. outdoor control circuit board If there is extreme difference with actual pipe lt condenser evaporator gt temperature replace indoor controller board There is no abnormality if none of above comes within the unit Turn the power off and on again to operate In case of checking pipe temperature with outdoor controller circuit board be sure to connect A control service tool PAC SK52ST Abnormal refrigerant circuit During Cooling Dry or Auto Cooling operation when the following are regarded as failures when detected for one second a The compressor continues to run for 30 or more seconds b The liquid pipe temperature or the condense evaporator temperature is 75 C or more These detected errors will not cancelled until the power source is reset Abnormal operation of 4 way valve Disconnection of or leakage in refrigerant pipes Air into refrigerant piping Abnormal operation no rotation of indoor fan Defective fan motor Defective indoor control board Defective refrigerant circuit clogging When this error occurs be sure to replace the 4 way valve Check refrigerant pipes for disconnection or leakage After the recovery of refrigerant vacuum dry the whole refrigerant circuit Refer to section 8 7 Check refrigerant circuit for operation To avoid entry of moisture or air into refrigerant circuit which could cause abnormal high pressure purge air in r
46. rmal if data cannot be normally read from the nonvolatile memory of the remote controller control board Error code E1 Abnormal if the clock function of remote controller cannot be normally operated Error code E2 OCH493D Defective remote controller 17 Q Replace remote controller Error Code Abnormal point and detection method Cause Countermeasure Forced compressor stop due to water leakage abnormality When the intake temperature subtracted from liquid pipe temperature is less than 10 C drain sensor detects whether it is soaked in the water or not at the interval of 90 seconds Drain pump will start operating when the drain sensor detects to be soaked in the water The unit has a water leakage abnormality when the following conditions a and b are satisfied while the above mentioned detection is performed a The drain sensor detects to be soaked in the water 10 times in a row b The intake temperature subtracted from liquid pipe temperature is detected to be less than 10 C for a total of 30 minutes When the drain sensor detects to be NOT soaked in the water the detection record of a and b will be cleared The drain sensor detection is performed in operations other than cooling When the unit stops operating during heating or fan operation when the unit stops because of some abnormality Once the water leakage abnormality is detected abnormality
47. roller is connected with 2 indoor units or more G Repetition of refrigerant address Defective transmitting receiving circuit of remote controller Defective transmitting receiving circuit of indoor controller board Noise has entered into transmis sion wire of remote controller Set a remote controller to main and the other to sub Remote controller is connected with only indoor unit The address changes to a separate setting Diagnose remote controller a When RC is displayed remote con trollers have no problem Turn the power off and on again to check When becoming abnormal again replace indoor controller board b When RC NG is displayed replace remote controller c When RC or ERC 00 66 is displayed noise may be causing abnormality Indoor outdoor unit communication error Signal receiving error Abnormal if indoor controller board cannot receive any signal normally for 6 minutes after turning the power on Abnormal if indoor controller board cannot receive any signal normally for 3 minutes Consider the unit abnormal under the following condition When 2 or more indoor units are connected to one outdoor unit indoor controller board cannot receive a signal for 3 minutes from outdoor controller circuit board a signal which allows outdoor controller circuit board to transmit signals Contact failure short circuit or miswirin
48. rom the panel and loose another 2 screws which are fixed to the oval hole have different diameter 8 Rotate the panel a little to remove the screws Slide the panel so that the screw comes to a larger diameter of the oval hole which has 2 different diameters Figure 2 Corner Screw panel Panel Corner panel Photo 2 Connectors 4 Removing the electrical parts 1 Remove the 2 screws and the control box cover Electrical parts in the control box Indoor controller board 1 Terminal block TB4 Indoor power board P B OCH493D 27 Photo 3 Indoor power board P B Terminal block TB4 Indoor controller board 1 OPERATING PROCEDURE PHOTOS amp ILLUSTRATIONS 5 Removing the room temperature thermistor TH1 1 Remove the panel Refer to Procedure 3 2 Pull out the room temperature thermistor from the drain pan 3 Remove the 2 screws fixed to the control box cover and remove the control box cover 4 Remove the connector CN20 from the indoor controller board and disconnect the room temperature thermistor Removing the drain pan 1 Remove the panel Refer to Procedure 3 2 Remove the room temperature thermistor and the 2 lead wires held with fastener wireless controller board relay connector 9P red and panel relay connector 10P white 3 Remove the 4 screws fixed to the drain pan and remove the drain pan 4 Remove the fan guard
49. tal wiring length max 500 m Do not use cable x 3 or more The number of connecting indoor units max 16 units The number of connecting remote controller max 2 units When the above mentioned problem of O are not seen Diagnose remote controllers a When RC 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 is displayed replace remote controller c When RC or ERC 00 66 is displayed noise may be causing abnormality Error Code Abnormal point and detection method Cause Countermeasure Remote controller transmission error E3 signal receiving error E5 Abnormal if remote controller could not find blank of transmission path for 6 seconds and could not transmit Error code E3 Remote controller receives transmitted data at the same time compares the data and when detecting it judges different data to be abnormal 30 continuous times Error code Abnormal if indoor controller board could not find blank of transmission path Error code E5 Indoor controller board receives transmitted data at the same time compares the data and when detecting it judges different data to be abnormal 30 continuous times Error code E5 2 remote controllers are set as main In case of 2 remote controllers Remote cont
50. 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 OCH493D 28 Photo 6 Flat plate Screw Nut Screws Fan motor Screws OPERATING PROCEDURE PHOTOS amp ILLUSTRATIONS 9 Removing the drain pump DP and drain sensor DS 1 Remove the panel Refer to Procedure 3 2 Remove the drain pan Refer to Procedure 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 6 Disconnect the lead wires to the direction of the drain pump See Photo 7 7 Remove the 3 screws of the drain pump 8 Cut the drain hose band pull out the drain hose from the drain pump 9 Pull out the drain pump 10 Remove the drain sensor and the holder Photo 7 Screw Cover Control box Y Lead wires Photo 8 Drain pump DP Fixing band Control box 10 Removing the heat exchanger 1 Remove the panel Refer to Procedure 3 2 Remove the drain pan Refer to Procedure 6 3 Remove the nut and the washer from the turbo fan and remove the turbo fan 4 Remove the
Download Pdf Manuals
Related Search