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1. quid lt 1 gt YLW ORN OUTDOOR UNIT BLK i Quo E Q LED3 ie 9 X1 ORN l G9 LED2 CNP BLU BRN 3 000000000 sine S CN90 9 2 WHT LDSWE LDSWE B SWE2 oooo BLU W B 1 REC1 o e ooo 5 o LED1 1 CN152 10 1 3 ole 69 WHT BLK CN301 LED2 GRN CN151 CN20 CN44 N WHT RED RB 1 5 12 1 4 i j 1 1 t EHH TB5 i j TB6 OPTION PART Table 1 gt Sw1 Table 2 MODEL SELECTION SW2 CAPACITY CODE SETTING MODELS SETTING MODELS SETTING MODELS SETTING 123451 em 12345 ony 123545 ml llai minimini The black square indicates a switch position Notes 1 Symbols used in wiring diagram above are 2 Indoor and outdoor connecting wires have polarities make sure to match terminal numbers S1 S2 S3 for correct wirings 3 Since the outdoor side electric wiring may change be sure to check the outdoor unit electric wiring diagram for servicing 4 This diagram shows the wiring of indoor and outdoor connecting wires specification of 230V adopting superimposed system of power and signal 1 Use copper supply wires Connector2. Operation Monitor Display GREEN ORANGE STOP O The orange lamp follows the switch operation COOL as indicated the left for 5 sedonds and then it will return to the normal display HEAT ON Details of emergency mode are as shown below Operation Mode COOL HEAT Set Temperature 24 75 F 24 75 F Fan Speed High High Airflow Direction Up and Down Horizontal Downward 9 5 2 When wired remote controller or indoor unit microprocessor fails 1 When the wired remote control or the indoor unit microcomputer has failed but all other components work properly if you set the switch SWE on the indoor controller board ON the indoor unit will begin Emergency Operation When Emergency Operation is activated the indoor unit operates as follows 1 Indoor fan is running at high speed Note on the IR wireless remote control When the remote control does not function it is possible to activate Emergency Operation by using the indoor unit Emergency Operation switch However if the indoor unit microprocessor has failed it is nesessary to proceed with points 2 and 3 below as in the case of the wired remote control 2 When you activate Emergency Operation of the cooling or heating you have to set the switch SWE on the indoor controller board and activate Emergency Operation of the outdoor unit For details on how to activate Emergency O
3. 10 Terminal block 8 REFRIGERANT SYSTEM DIAGRAM 24 4 4 PKA A36KA4 TH Strainer 50 Heat exchanger Refrigerant GAS pipe connection Flare L r Thermistor TH2 Refrigerant flow in cooling Pipe temperature Liquid Refrigerant flow in heating Thermistor TH5 Cond Eva temperature Refrigerant LIQUID pipe connection Flare Ez Thermistor TH1 Room temperature Distributor Strainer 50 with strainer 2250 22100 11 9 1 TROUBLESHOOTING 9 TROUBLESHOOTING Error code display by self diagnosis and actions to be taken for service gt Present and past error codes are logged and displayed on the wired remote controller or controller board of outdoor unit Actions to be taken for service and the trouble reoccurrence at field are summarized in the table below Check the contents below before investigating details Unit conditions at service Error code Actions to be taken for service summary Displayed Judge what is wrong and take a corrective action according to 9 3 Self diagnosis action table The trouble is reoccurring Not displayed Conduct troubleshooting and ascertain the cause of the trouble according to 9 4 Troubleshooting by inferior phenomena The trouble is not reoccurring D Consider the temporary defects such as the work of
4. 9 7 TEST POINT DIAGRAM Indoor controller board PKA A24KA4 TH PKA A30KA4 TH PKA A36KA4 TH CNMF Connect to the fan motor MF DC294 325V DC15V DC0 6 5V DCO or DC15V CN105 RFI Radio frequency interface SWE Emergency b operation connector Li SW1 Model selection _ rare OF SW2 Capacity setting CN151 Connect to the vane motor MV Jumper wire J41 J42 Pair No setting for IR wireless remote controller CN152 Connector Back up heating Room temp thermistor TH1 Connector Connector LOSSNAY HA terminal A CN44 Pipe temperature thermistor Q O Liquid TH2 9 05 Condenser Evaporator 5 operation switch Wireless remote controller board 24 CNO1 Connect to the Terminal block TB4 G 208 230VAC FUSE 3 15A 250V LED1 Power supply I B LED2 Power supply R B LED3 Transmission Indoor outdodr CN3C Transmission Indoor outdodr DC 0 24V CN22 Connect to the terminal block TB5 Remote controller connecting wire only PKA A KA CN30 Connector LLC CN32 Remote switch CN90 Connect to the remote operation adapter Centrally control Control signal 13VDC pulse input Operation indicator 13VDC Malfunction indic
5. TIMER CONTROL buttons AUTO STOP OFF timer when this switch is set the air conditioner will be automatically stopped at the preset time AUTO START ON timer when this switch is set the air conditioner will be automatically started at the preset time h and min buttons Buttons used to set the hour and minute of the current time and timer settings LOUVER button Changes left right airflow direction Not available for this model CLOCK button RESET button SET button Service Ref 4 SPECIFICATIONS PKA A24KA4 TH Power supply phase cycle voltage 1 phase 60Hz 208 230V Max Fuse Size 15 Min Circuit Ampacity 1 External finish White Munsell 1 0Y 9 2 0 2 Heat exchanger Plate fin coil Fan Fan drive x No Line flow fan direct x 1 Fan motor output kW 0 056 Fan motor F L A 0 36 Airflow Low Middle High m min CFM Dry 18 20 22 635 705 775 Wet 16 18 20 570 635 700 External static pressure INDOOR UNIT Pa mmAq O direct blow Operation control amp Thermostat Remote controller amp built in Noise level Low Middle High dB 39 42 45 Field drain pipe 1 0 mm in 16 5 8 Dimensions mm in 1170 46 1 16 mm in 295 11 5 8 mm in 365 14 3 8 Service Ref
6. MONITORISET DAY T 1 TEST lt Enter gt button Test Run button Q o 2 Q amp 2 gt lt Ge K PAR 21MAA Timer On Off button CLOCK V OPERATION A CLEAR Set Day button n Airflow Up Down button Louver button Opening the cover PRN VV Operation button To return operation number Built in temperature sensor Ventilation button A Operation button To go to next operation number Note PLEASE WAIT message NOT AVAILABLE message far as any of the indoor units is equipped with the function This message is displayed for approximately 3 minutes when power is supplied to the indoor unit or when the unit is recovering from a power failure This message is displayed if an invalid button is pressed to operate a function that the indoor unit does not have If a single remote controller is used to operate multiple indoor units simultaneously that are different types this message will not be displayed as 5 e IR wireless remote controller Option CHECK STRA display Indicate that the unit is being checked or test run MODEL SELECT display display
7. remote controller board board from the holder Photo 3 Terminal block TB4 Indoor controller Connector board I B for ground wire Terminal block TB2 option Terminal block E TB5 Electrical box 29 OPERATION PROCEDURE 3 REMOVING THE ELECTRICAL BOX 1 Remove the panel and the corner box Refer to step 1 2 Remove the front and side electrical box covers each 1 Screw PHOTOS Terminal block TB4 Photo 4 Indoor controller 3 Remove the indoor outdoor connecting wire from termi Connector board 1 nal block TB4 for ground 4 Disconnect the connectors on the indoor controller board wire 5 Disconnect the connector for ground wire 2 option 6 Remove screw on lower side of the electrical box See Photo 5 Terminal block 7 Push up the upper fixture catch to remove the box then Electrical B remove it from the box fixture box REMOVING THE NOZZLE ASSEMBLY with VANE Photo 5 the bottom and VANE MOTOR AND DRAIN HOSE 1 Remove the panel and corner box Refer to step 1 2 Remove the electrical box covers Refer to step 2 3 Disconnect the vane motor connector CN151 on the indoor controller board 4 Pull out the drain hose from the nozzle assembly and remove nozzle assembly See Photo 5 Vane motor Nozzle assembly Drain hose Screw of electrical box REMOVING THE VA
8. Blinks when model is selected OPERATION MODE display OPERATION MODE display Indicates which operation mode is in effect display The vertical direction of airflow is indicated h 1 display Displays selected fan speed ON OFF button The unit is turned ON and OFF alternately each time the button is pressed FAN SPEED SELECT button Changes the fan speed MODE SELECT button Switches the operation mode between COOLING DRY FAN HEATING and AUTO mode case the outdoor unit is cooling only type the heating and auto mode are not available CHECK TEST RUN button Performs an inspection check or test operation Do not use it for normal operation VANE CONTROL button Changes the air flow direction Lights up while the signal is transmitted to the indoor unit when the button is pressed Temperature setting display Indicates the desired temperature setting which is set CLOCK display Displays the current time TIMER display Displays when in timer operation or when setting timer t display Displays the order of timer operation O O20 display Displays whether timer is on or off button Sets any desired room temperature
9. No trouble generated the past nn LILI Co No corresponding unit EET Unit No pce na x Timer ON OFF button LILI To delete check code 5 Display the error code on the self check result display screen The address for self check will blink when the ON OFF button is pressed twice within 3 seconds To be continued to the next page 13 Refer to following tables for details on check codes Output pattern A Beepersounds Beep Beep Beep Beep Beep Beep Beep operation ll ___ o sl ow os nth ie 1 Repeated INDICATOR apa gt lamp blink Off On On On Off On On pattern Self check APProx 2 5 sec 0 5 sec 0 5 sec 0 5 sec 0 5 sec Approx 2 5 sec 0 5 sec 0 5 sec starts M oy Start signal Y received Number of blinks beeps in pattern indicates the check Number of blinks beeps in pattern indicates code in the following table i e 5 for P5 the check code in the following table Output pattern B Beepersounds Beep Beep Beep Beep Beep Beep operation 1 zw gt fenes de qs 29 Repeated INDICATOR gt gt gt lamp bli
10. PKA A30KA4 TH Power supply phase cycle voltage 1 phase 60Hz 208 230V Fuse Size 15 Min Circuit Ampacity 1 External finish White Munsell 1 0Y 9 2 0 2 Heat exchanger Plate fin coil Fan Fan drive x No Line flow fan direct x 1 Fan motor output kW 0 056 Fan motor F L A 0 36 Airflow Low Middle High 18 20 22 635 705 775 Wet 16 18 20 570 635 700 E z 5 x Q a 2 External static pressure Pa mmAq O direct blow Operation control amp Thermostat Remote controller amp built in Noise level Low Middle High dB 39 42 45 Field drain pipe 1 0 mm in 16 5 8 Dimensions mm in 1170 46 1 16 mm in 295 11 5 8 mm in 365 14 3 8 Service Ref 21 46 PKA A36KA4 TH Power supply phase cycle voltage 1 phase 60Hz 208 230V Max Fuse Size 15 Min Circuit Ampacity 1 External finish White Munsell 1 0Y 9 2 0 2 Heat exchanger Plate fin coil Fan Fan drive x No Line flow fan direct x 1 Fan motor output kW 0 056 Fan motor F L A 0 57 Airflow Low Middle High m3 min CFM Dry 20 23 26 705 810 920 Wet 18 21 23 635 730 830 INDOOR UNIT External static pressure Pa mmAq O direct blow Operation control amp Therm
11. Min 8 21 32 220 Min 2 50 5 2 9 16 65 2 9 16 65 Min 2 27 32 72 4 13 32 10 7 9 27 32 250 Center measurement hole 43 32 42 5 Mount board 15 316 5 S Sos ES Indoor unit outline screw hole DEP 1 1 4 32 i 2 5 8 15 5 ER z z 12125 0 0 31132025 12012 5 1 31 32450 1 15 32 97 5 2 15 16 75 17T 1_ 2 15 32 62 5 IE 3 7 16 87 5 4 118 104 5 3 15 16 100 4 19 32 117 4 20 32 125 zs 5 5 332 129 5 5 19 32 142 Mig ses TV eortetter 8 17 32 217 9 17 32 242 74 EX 14 9 1 32 229 5 11 279 5 X 3 10 13 32 264 5 s 11 1 2 292 ied 12 5 32 308 5 r Ale pe gt 12 1 4 311 2 2 a33 8 5 a V S39 3 5 55 2 8 Was 9 5 sos Knockout hole for Wall hole for rear piping e ong 2 15 16 18 29 32 75 480 7 24 4 WIRING DIAGRAM 4 PKA A36KA4 TH Explanation of symbols Symbol Name Symbol Name LB Indoor controller board M Vane motor CN2L LOSSNAY 5 CN30 LLC S W Switch board C
12. gt gt 1 28 days 1 1 28 days 1 Ex When the request code number is 313 each unit operates alternately in daily cycle Note When the unit is restarted to operate after turning off the power or OFF operation the unit which was operating will start oper ation To operate the main unit refer to the 10 1 2 and set the request code No which is not the same as the current one and set again the former request code No 2 2nd stage cut in function Outline of functions When the 1st unit can NOT supply with sufficient capacity for exceptionally high demand conditions and the actual room temperature reaches set point the 2nd unit starts operation in conjunction with the 1st unit Once the actual room temperature goes down to 4 degrees C 7 5 degrees F below set point the 2nd unit stops operation automatically set point set temperature by R C remote controller 4 6 8 7 5 10 8 14 4 F selectable Number of operating units is determined according to the room temperature and set point When room temperature becomes higher than set point standby unit starts 2 units operation When room temperature falls below set point 4 7 5 F standby unit stops 1 unit operation 26 System constraint This function is available only in cooling mode Ex Set temp by R C 20 C 68 F did E Set point 26 79 F When request code number
13. protection devices in the refrigerant circuit including compressor poor connection of wiring noise and etc Re check the symptom and check the installation environment refrigerant amount weather when the trouble occurred matters related to wiring and etc 9 Reset error code logs and restart the unit after finishing service 9 There is no abnormality in electrical component controller board remote controller and etc Not logged Re check the abnormal symptom 2 Conduct trouble shooting and ascertain the cause of the trouble according to 9 4 Troubleshooting by inferior phenomena Continue to operate unit for the time being if the cause is not ascertained There is no abnormality concerning of parts such as electrical component controller board remote controller and etc 12 9 2 MALFUNCTION DIAGNOSIS METHOD BY REMOTE CONTROLLER n case of trouble during operation When a malfunction occurs to air conditioner both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop lt Malfunction diagnosis method at maintenance service wireless remote controller Procedure ios 1 Press the CHECK button twice CHECK lights and refrigerant etrigeran MITSUBISHI ELECTRIC address address 00 blinks display Check that the remote controller s CHECK display has stopped before continuing display 2 Press th
14. to set the desired request code No 311 318 321 324 6 Press the FILTER button to perform function setting If above setting operations are done correctly Request code number will appear in data display area Example When the 311 of Request code number is set 311 appears on the screen Refererence You can check current request code number setting by setting the request code number 310 or 320 and pressing the FILTER button 8 Example When the current setting is Setting No 2 Request code 311 311 appears the screen 7 To return to normal mode press the OON OFF button 10 2 BACK UP HEATING FUNCTION CN152 Temperature diierence I Bad hie 10 2 1 Operation Z Set temp Room temp signal output Outline of functions The back up heater signal is sent out according to the tempera 220300 ture difference between indoor room temperature and tem 0 lt Z lt 2 5 C 4 5 F Keeping condition perature This function is available only in heating operation 2 5 4 5 Z 10 2 2 How to connect When connecting to the connector CN152 of the indoor unit use PAC SE59RA E optional parts 7 0 25 4 5 OFF 28 11 DISASSEMBLY PROCEDURE PKA A24KA4 TH PKA A30KA4 TH PKA A36KA4 TH Be careful when removing heavy parts OPERATION PROCEDURE PHOTOS amp ILLUSTRATIONS 1 REMOVING THE PANEL Photo 1 Front grille Scr
15. OPERATION INDICATOR lamp blinks Check code Number of times Symptom Remark Indoor outdoor unit communication error 1 E9 Transmitting error Outdoor unit 2 UP Compressor overcurrent interruption 3 U3 U4 Open short of outdoor unit thermistors For details check 4 UF Compressor overcurrent interruption When compressor locked T Abnormal high discharging temperature 49C operated aa ae 5 U2 insufficient refrigerant Nam 6 U1 Ud Abnormal high pressure 63H operated Overheating As for outdoor protection operation unit refer to 7 U5 Abnormal temperature of heatsink outdoor unit s 8 U8 Outdoor unit fan protection stop service manual 9 U6 Compressor overcurrent interruption Abnormal of power module 10 U7 Abnormality of superheat due to low discharge temperature 11 U9 UH Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit Current sensor error 12 B 13 ES 14 Others Other errors Refer to the technical manual for the outdoor unit 1 If the beeper does not sound again after the initial 2 beeps to confirm the self check start signal was received and the OPERATION INDICATOR lamp does not come on there are no error records 2 If beeper sounds 3 times continuously beep beep beep 0 4 0 4 0 4 sec after the initial 2 beeps to confirm the self check start signal was received the specified refrigerant add
16. Weak batteries of IR wireless remote controller Contact failure of connector CNB on IR wireless remote controller board Insert failure G Contact failure of connector CN90 on indoor con troller board Insert failure 4 Contact failure of connector between IR wireless remote controller board and indoor controller board 20 Replace batteries of IR wireless remote controller Check contact failure of each connector If no problems are found of connector replace indoor controller board When the same trouble occurs even if indoor controller board is replaced replace IR wireless remote controller board 9 5 9 5 1 When IR wireless remote controller fails or battery is exhausted When the remote controller cannot be used When the batteries of the remote controller run out or the remote controller malfunctions the emergency operation can be done using the emergency buttons 9 DEFROST STAND BY lamp ORANGE Operation lamp GREEN Emergency operation switch cooling heating Receiver Each press of the emergency operation switch will toggle the operation mode Check COOL HEAT with the operation monitor display The display will appear orange for 5 seconds after pressing the emergency operation switch Heat pump type p Cooling gt Heating gt Stop Cooling Only type rp Cooling gt Stop
17. case of 2 remote con trollers Remote controller is connected with 2 indoor units or more Repetition of refrigerant address Defective transmitting receiving circuit of remote controller Defective transmitting receiving circuit of indoor controller board Noise has entered into trans mission wire of remote control ler Set a remote controller to main and the other to sub Remote controller is connected with only one indoor unit The address changes to a separate setting Diagnose remote controller a When RC OK 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 is displayed replace remote controller When RC or ERC 00 66 is dis played noise may be causing abnormal ity 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 as abnormal under the following condition When 2 or more indoor units are connected to an 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
18. controller board Insert failure Breaking of wire or contact failure of thermistor wiring Defective refrigerant circuit is causing thermistor tempera ture of 90 C 194 F or more or 40 C 40 F or less Defective indoor controller board Check resistance value of thermistor For characteristics refer to P1 above Check contact failure of connector CN44 on the indoor controller board Refer to 9 7 Turn the power on and check restart after inserting connector again Check pipe lt liquid gt temperature with remote controller in test run mode If pipe lt liquid gt 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 extremely difference with actual pipe lt liquid gt temperature replace indoor controller board Turn the power off and on again to operate after check Contact failure of drain float switch CN4F Extract when the connector of drain float switch is disconnected and of connector CN4F is not short circuited Constantly detected during operation Contact failure of connector Insert failure Defective indoor controller board Check contact failure of float switch connec tor Turn the power on again and check after inserting connector again Operate with connector short circuited Rep
19. controller transmission Contact failure at transmission Check disconnection or looseness of indoor error EO signal receiving error E4 wire of remote controller unit or transmission wire of remote controller Abnormal if main or sub remote con remote controllers are set Q Set one of the remote controllers main troller cannot receive any transmission as sub remote controller In if there is no problem with the action above normally from indoor unit of refrigerant this case EO is displayed on Check wiring of remote controller address 0 for 3 minutes remote controller and E4 is Total wiring length max 500m 1640ft Error code EO displayed at LED LED1 LED2 Do not use cable x 3 or more Abnormal if sub remote controller could on the outdoor controller circuit The number of connecting indoor units not receive for any signal for 2 minutes board max 16 units Error code EO Miswiring of remote controller The number of connecting remote control Defective transmitting receiving ler max 2 units Abnormal if indoor controller board circuit of remote controller When the above mentioned problem of D O cannot receive any data normally from Defective transmitting receiving are not applied remote controller board or from other circuit of indoor controller board Diagnose remote controllers indoor controller board for 3 minutes of refrigerant addresses 0 a When RC is displayed remot
20. is 323 Room temp 2 Set point Room temp lt Set point 4 C 7 5 1 Start operation Sub unit start operation Sub unit stop 26 2nd unit i Main 79 F unit IC 1 4 degree C 7 5 degreeF 22C 2 unit Cut out 71 5 IC 2 20 C Mw 68 F 10 1 2 How to set rotation function Back up function 2nd stage cut in function You can set these functions by wired remote controller Maintenance monitor NOTE Both main and sub unit should be set in same setting Every time replacing indoor controller board for servicing the function should be set again 1 Request Code List Rotation setting Setting No Setting contents Initial Request code 9 setting 370 Monitoring the request code of current setting CR s Rotation and Back up OFF Normal group control operation 512 Back up function only Rotation ON Alternating interval 1 day and back up function Rotation ON Alternating interval 3 day and back up function Rotation ON Alternating interval 5 day and back up function Rotation ON Alternating interval 7 day and back up function Rotation ON Alternating interval 14 day and back up function Rotation ON Alternating interval 28 day and back up function 2nd stage cut in setting Setting No Request code 320 Monitoring the request code of current setting 321 Cut in function OFF Initial Setting conte
21. ES Hz BAND CENTER FREQUENCIES Hz UNIT WALL L 3 3 3 3 6 OUTLINES AND DIMENSIONS PKA A24KA4 TH PKA A30KA4 TH PKA A36KA4 TH Unit inch mm Top side 16 11 16 423 7 Left side Right side Mount board Knockout for left piping Eo 2 29 32 74 33 21 32 855 46 1716 1170 Front side Grille open Operation lamp Knocka thola gt for right piping 2 DEFROST STAND BY lamp Receiver M Terminal block for Outdoor unit EJ Terminal block for power supply option S Terminal block for MA remote controller Emergency operation switch cooling heating 1 3 16 30 1 3 8 35 _ 4 27132 123 2193266 18 31 32 482 Liquid pipe 6 1 16 154 23 1 32 585 Drain hose 9 5 9 32 134 Under side Piping connection Vane auto Louver manual Liquid pipe Refrigerant pipe 3 8 0 49 52 Flared connection 3 8F for Toner ping Refrigerant pipe 5 8 0 0 415 88 Sleeve purchased locally Through hole Gas pipe Flared connection 5 8F 2 15 16 15 16 3 run 5 32 Drain hose 5 8 416 0 0 Required space Indoor unit Knockout hole for piping Min 1 7 8 48 Air outlet
22. MITSUBISHI Changes for the Better ELECTRIC SPLIT TYPE HEAT PUMP AIR CONDITIONERS SPLIT TYPE AIR CONDITIONERS November 2010 No OCH488 SERVICE MANUAL Series Wall Mounted R410A Model DUE Service Ref NOTE This manual describes PKA A24KA4 TH da a indoor units RoHS compliant products s EU PKA A36KA4 TH CONTENTS 1 REFERENCE 2 2 SAFETY 3 3 PART NAMES AND 4 ASSPEGIEICATIONS 7 5 NOISE CRITERION 8 6 OUTLINES AND DIMENSIONS 9 7 WIRING nnn 10 8 REFRIGERANT SYSTEM DIAGRAM 11 9 12 10 SPECIAL FUNCTION 24 11 DISASSEMBLY 27 PARTS CATALOG OCB488 CONTROLLER CONTROLLER Option Option LL f S L fin Intertek If 9700058 IR WIRELESS REMOTE WIRED REMOTE 31 US 1 REFERENCE MANUAL OUTDOOR UNIT SERVICE MANUAL Service Ref Service Manual No PUZ A24 30 36NHA4 PUZ A24 30 36NHA4 BS OCH481 PUY A24 30 36NHA4 OCBA81 PUY A24 30 36NHA4 BS B Remote controller Optional parts Radio frequency interface Wired remo
23. N32 Remote switch SWE2 Emergency operation CN41 Connector HA terminal A TB2 Terminal block Indoor unit Power option CN51 Connector Centrally control 4 Terminal block Indoor outdoor connecting line CN90 Connector Remote operation adapter TB5 Terminal block Remote controller transmission line CN105 Connector Radio frequency interface TH1 Room temp Thermistor CN152 Connector Back up heating 32 F 15kQ 77 F 5 4kQ Detect FUSE _ FUSE T3 15AL250V TH2 Pipe temp Thermistor liquid LED1 Power supply I B 32 F 15kQ 77 F 5 4kQ Detect LED2 Power supply R B TH5 Cond eva temp Thermistor LED3 Transmission Indoor outdoor 32 F 15kQ 77 5 4 Detect SW1 Switch Model selection 5 table 1 W B Pcb for IR wireless remote controller Sw2 Switch Capacity code See table 2 LED1 LED Operation indication Green SWE Connector Emergency operation LED2 LED Preparation for heating Orange R B Wired remote controller board Receiving unit TB6 Terminal block Remote controller transmission line Radio frequency interface for RF thermostat
24. NE MOTOR 1 Remove the nozzle assembly Refer to step 4 2 Remove 2 screws of the vane motor unit cover and pull out the vane motor unit 3 Remove 2 screws of the vane motor unit 4 Remove the vane motor from the vane motor unit 5 Disconnect the connector from the vane motor Photo 6 Screws of the vane motor unit Screws of the vane motor unit cover 30 OPERATION PROCEDURE 6 REMOVING THE INDOOR FAN MOTOR AND THE LINE FLOW FAN 1 Remove the panel and the corner box Refer to step 1 2 Remove the electrical box Refer to step 2 and the nozzle assembly Refer to step 3 3 Remove the water cut See Photo 2 4 Remove the screw fixing the line flow fan See Photo 8 5 Remove 5 screws fixing the motor bed See Photo 7 6 Remove the lead wire of pipe thermistor from the hook of motor bed See Photo 7 7 Remove the screw fixing motor band See Photo 7 8 Remove the motor bed together with fan motor and motor band 9 Remove 3 screws fixing the left side of the heat exchanger See Photo 9 10 Lift the heat exchanger and pull out the line flow fan to the lower left Photo 9 Screws of the left side of the heat exchanger 7 REMOVING THE LIQUID PIPE THERMISTOR AND COND EVA PIPE THERMISTOR 1 Remove the panel and the corner box Refer to step 1 2 Remove the electrical box covers Refer to step 2 3 Remove the water cut See Photo 2 4 Remove the li
25. ace No signals from the remote controller can be received OPE lamp is blinking The buzzer makes a short ping sound Note Operation is not possible for about 30 seconds after cancellation of function selection Correct operation For description of each LED 2 3 provided on the 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 addresses 0 LED3 communication between indoor and outdoor units Indicates state of communication between the indoor and outdoor units Make sure that this LED is always blinking 15 9 3 SELF DIAGNOSIS ACTION TABLE Error Code Abnormal point and detection method Note Refer to the manual of outdoor unit for the details of display Cause Such as F U and other E 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 min utes The unit returns to normal opera tion if it has been reset normally Constantly detected during cooling drying and heating oper
26. ard Refer to 9 7 detected Abnormal if the unit does not board Insert failure Turn the power on and check restart after get back to normal within minutes The Breaking of wire or contact inserting connector again unit returns to normal operation if ithas failure of thermistor wiring Operate in test run mode and check pipe lt con been reset normally Temperature of thermistor is DOSE with outdoor Constantly detected during cooling 90 194 or more or bs a drying heating operation except 40 C 40 F or less caused by tek efrosting defective refrigerant circuit d s MES mode refrigerant circuit may have defect Short 90 C 194 F or more Defective indoor controller Open 40 40 or less board Operate in test run mode and check pipe con denser evaporator temperature with outdoor control circuit board If there is extreme difference with actual pipe condenser evaporator 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 Forced compressor stop Drain pump trouble Check the drain pump due to water leakage abnormality Drain defective Check whether water can be drained The u
27. ates that the timer is off The indicator N shows tion of the outcoming ai the direc irflow One Hour Only indicator Shows the room temperature The room temperature display range is 46 102 F The display blinks if the temperature is less than 46 F or 102 F or more Displays if the airflow is Temperature Setting Shows the target temperature according to model also changes low or downward during COOL or DRY mode Operation varies The indicator goes off in 1 hour when the airflow direction set to Louver display Indicates the action of the swing louver Does not appear if the louver is not running Power On indicator Operation Section Temperature setting buttons 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 Down Up Timer Menu button MITSUBISHI ELECTRIC Monitor Set button Mode button Return button ON OFF button Fan Speed button Filter 1 button p Set Time buttons 1 DON OFF oC FILTER ful 5 Cos CA Ahead
28. ation Short 90 C 194 F or more Open 40 C 40 F 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 32 F 10 C 50 F 20 C 68 F 40 C 104 F If you put force on draw or bend the lead wire while measuring resistance value of thermis tor breaking of wire or contact failure can be detected Check contact failure of connector CN20 on the indoor controller board Refer to 9 7 Turn the power on again 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 check 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 194 F or more Open 40 C 40 F or less Defective thermistor characteristics Contact failure of connector 44 on the indoor
29. ation of refrigerant oil or malfunction of com pressor The following tools are necessary to use R410A refrigerant Tools for R410A Flare tool Size adjustment gauge Vacuum pump adaptor Electronic refrigerant charging scale Gauge manifold Charge hose Gas leak detector Torque wrench The refrigerant oil applied to flare and flange connections must be ester oil ether oil or alkylbenzene oil in a small amount Handle tools with care If large amount of mineral oil enters that can cause deterio ration of refrigerant oil etc If dirt dust or moisture enters into refrigerant cycle that can cause deterioration of refrigerant oil or malfunction of com pressor Charge refrigerant from liquid phase of gas cylinder If the refrigerant is charged from gas phase composition change may occur in refrigerant and the efficiency will be lowered 1 Cautions for service Do not use a charging cylinder If a charging cylinder is used the composition of refrigera nt will change and the efficiency will be lowered Ventilate the room if refrigerant leaks during operation If refrigerant comes into contact with a flame poisonous gases will be released 1 Perform service after recovering the refrigerant left in unit completely 2 Do not release refrigerant in the air 3 After completing service charge the cycle with specified amount of refrigera
30. ator 13VDC 9 8 FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the dip switch and the jumper wire on control P C board The black square indicates a switch position Jumper wire Functions Setting by the dip switch and jumper wire Remarks MODELS SETTING SWA1 12345 settings PKA AKA4 EREMO MODELS SETTING MACRO swe Capacity T2315 settings A30 ON E OFF 12345 A36 Mmm 0 E OFF Initial setting Wireless remote Control PCB setting Wireless remote controller 0 Pair number controller setting 41 J42 Control PCB O for both J41 and J42 J41 setting with 0 4 pair number settings are supported J42 wireless 1 x The pair number settings of the wireless remote remote 2 x controller and indoor control PCB J41 J42 are controller 3 9 x x given in the table on the left in the table indicates the jumper wire is dis Jumper wire Short X Open Indoor ontroller Indoor O With board type Spare parts x Without setting 25 10 SPECIAL FUNCTION 10 1 Rotation Function and back up function 2nd stage cut in function This function is only available when using wired remote controller 10 1 1 O
31. day of the week For purposes of this explanation all parts of the display are shown Time Timer Display During actual operation only the relevant items will be lit timer is set Switched off is shown Shows the current time unless the simple or Auto Off If the simple or Auto Off timer is set the time to be Sensor indication Displays when the remote controller sensor is used Identifies the current operation Locked indicator Indicates that remote controller but tons have been locked Shows the operating mode etc Multilanguage display is available MITSUBISHI ELECTRIC TIME SUN MON TUE WED THU FRI SAT di C AFTER I gt L I1 AFTER ERROR CODE FUNCTION LICHCPFC Lii 1r FC Centrally Controlled indicator Indicates that operation from the LR Sao SS D cos ONLY1Hr 4 38 4 Clean The Filter indicator To be displayed on when it is time to Clean the filter Timer indicators il WEEKLY 4 SIMPLE AUTO OFF 3 remote controller has been prohib The indicator comes on if the corre sponding timer is set ited by a master controller tor Up Down Air Direction indica Room Temperature display Timer is Off indicator Indic
32. de Check clogs of the filter Remove blockage Refer to 9 6 Check outdoor fan motor Check operating condition of refrigerant circuit Heating mode Check clogs of the filter Remove blockage Refer to 9 6 Check outdoor fan motor GCheck 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 minutes to detect Note 2 Abnormality P8 is not detected in drying mode Cooling range 3 deg C 5 4deg FJ2 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 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 deg C 5 4deg F S TH5 TH1 Q Slight temperature difference between indoor room temperature and pipe liquid or condenser evaporator gt temperature thermistor Shortage
33. e con Error code E4 Noise has entered into the trollers have no problem Turn the power Indoor controller board cannot receive transmission wire of remote off and on again to check If abnormality any signal from remote controller for 2 controller generates again replace indoor controller minutes Error code E4 board b When RC is displayed replace remote controller c When RC E3 or ERC 00 06 is dis played noise may be causing abnormality If the unit is not normal after replacing indoor controller board in group control indoor controller board of address 0 may be abnormal 18 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 sec onds 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 E3 Abnormal if indoor controller board could not find blank of transmission path Error code E5 Indoor controller board receives trans mitted 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
34. e temperature Select the refrigerant address of the Temperature buttons indoor unit for the self diagnosis ONOFF Note Set refrigerant address using the ay outdoor unit s DIP switch SW1 ON OFF A button p AN AT OMS For more information see the outdoor unit installation manual FAN autostop pO 9249 Point the remote controller at the f an air conditioner error occurs the MODE VANE AUTO STAR sensor on the indoor unit and indoor unit s sensor emits an intermit CHECK LOUVER h press the HOUR button tent buzzer sound the operation lamp CHECK TEST RUN TEES min blinks and the error code is button output It takes 3 seconds at most for error code to appear pru 4 SET RESET CLOCK o 4 Point the remote controller at the The check mode is cancelled sensor on the indoor unit and press the ON OFF button aWired remote controller D Turn on the power Press the CHECK button twice Set address with TEMP button if system control is used Press the ON OFF button to stop self check CHECK button Address SELF CHECK P I TEMP button aM MITSUBISHI ELECTRIC Vu DA IC Indoor unit OC Outdoor unit
35. ection Cooling mode The unit is in 6 minute resume prevention mode if pipe liquid or condenser evapo rator temperature stays under 15 5 for 3 minutes 3 minutes after the compressor started Abnormal if it stays under 15 C 5 F for minutes again within 16 minutes after 6 minute resume prevention mode Overheating protection Heating mode The units is in 6 minute resume prevention mode if pipe liquid or condenser evaporator temperature is detected as over 70 C 158 F after the compressor started Abnormal if the temperature of over 70 C 158 F is detected again within 10 minutes after 6 minute resume prevention mode Cooling or drying mode 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 defec tive Defective outdoor fan control Overcharge of refrigerant C Defective refrigerant circuit clogs 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 defec tive Defective outdoor fan control Overcharge of refrigerant Defective refrigerant circuit clogs Bypass circuit of outdoor unit is defective Cooling or drying mo
36. es trouble of the indoor controller circuit board and fan motor Self check Symptom The indoor fan cannot rotate Wiring contact check Contact of fan motor connector CNMF 4 Is there contact failure gt gt Yes gt V No Power supply check Remove the connector CNMF Measure the voltage in the indoor controller circuit board TEST POINT Voc between 1 and of the fan connector Voc DC294 325V TEST POINT Vcc between 4 and 3 of the fan connector DC15V lt Is the voltage normal gt 3 Indoor controller board fuse check Yes Y lt Is the fuse normal the fuse Yes Y m Repl the ind PS ep ace the Indoor Check the operation gt END controller board OK Check the operation gt END NG Replace fan motor 2 Sensor signal check Measure the voltage between CNMF and DC 0V and DC 15V in the indoor controller circuit board No Does the voltage repeat 35 DC OV and DC 15V C Replace the motor p es Y Yes Check the operation of fan gt END Replace the indoor controller board Y NG G Replace the indoor controller board Y OK Check the operation gt END 4 NG C Replace the fan motor 23
37. ews 1 Press and unlock the knobs on both sides of the front grille and lift the front grille until it is level Pull the hinges forward to remove the front grille See Photo 1 2 Remove 3 screw caps of the panel Remove 5 screws See Photo 1 3 Unfix 3 hooks See Figure 1 4 Hold the lower part of both ends of the panel and pull it slightly toward you and then remove the panel by pushing it upward 5 Remove the screw of the corner box See Photo 1 Screw of the Remove the corner box Screws and screw Caps corner box Figure 1 Hooks 2 REMOVING THE INDOOR CONTROLLER BOARD Photo 2 Screw of electrical AND THE WIRELESS CONTROLLER BOARD Water Cut box cover side 1 Remove the panel and the corner box Refer to step 1 2 Remove the front and side electrical box covers each 1 screw See Photo 2 3 Disconnect the connectors on the indoor controller board See Photo 3 4 Remove the switch board holder and open the cover 5 Pull out the indoor controller board toward you then remove the indoor controller board and switch board See Photo 3 Switch board 6 Remove the holder of IR wireless remote controller board holder 7 Disconnect the connector of IR wireless remote control Screw of electrical Holder of IR wireless ler board and remove the IR wireless remote controller box cover Front
38. ile memory of the indoor controller board Defective indoor controller board Replace indoor controller board Remote controller control board Abnormal if data cannot be read nor mally from the nonvolatile memory of the remote controller control board Error code E1 Abnormal if the clock function of remote controller cannot be operated normally Error code E2 Q Defective remote controller 19 Replace remote controller 9 4 TROUBLESHOOTING BY INFERIOR PHENOMENA Note Refer to the manual of outdoor unit for the detail of remote Phenomena controller Cause Countermeasure 1 Upward downward vane performance failure The vane is not downward during defrosting and heat preparation and when the thermostat is OFF in HEAT mode Working of COOL protection function Vane motor does not rotate Defective vane motor Breaking of wire or connection failure of connector Upward downward vane does not work The vane is set to fixed position Normal operation The vane is set to horizontal regardless of remote control Check left Check the vane motor Refer to How to check the parts Check for breaking of wire or connec tion failure of connector Normal operation Each connector on vane motor side is disconnected or set ting the fixed vanes by wired remote controller 2 Receiver for IR wireless remote controller
39. l Vane motor MV Re Yello Brow Orange Green Connect pin No Measure the resistance between the terminals using a tester Coil temperature 68 F Normal Abnormal Brown Red Q G Brown Orange 0 Brown Yellow 2500 790 Open or short Fan motor MF 9 6 1 Thermistor Refer to 9 6 2 lt Thermistor Characteristic graph Thermistor for lower temperature Room temperature thermistor TH1 Pipe temperature thermistor liquid TH2 32 F 10 C 50 F 20 C 68 F 25 C 77 F 30 86 F 40 C 104 Rt 15exp 3480 TCF Rt 15exp 3480 5 Condenser evaporator temperature thermistor TH5 Thermistor Ro 15kQ 3 Fixed number of B 3480 2 1 1 9 27341 273 1 1 73 132 273 15 9 6 6 3kO 5 4kQ 4 3kQ 3 0kQ lt Thermistor for lower temperature gt 50 40 wo o Resistance kQ N 10 20 10 0 10 20 30 40 50 C 4 14 32 50 68 86 104122 22 9 6 2 DC Fan motor fan motor indoor controller circuit board Check method of DC fan motor fan motor indoor controller circuit board Notes High voltage is applied to the connecter CNMF for the fan motor Pay attention to the service Do not pull out the connector CNMF for the motor with the power supply on It caus
40. lace indoor controller board if abnormality reappears Drain overflow protection operation Suspensive abnormality if drain float switch is detected to be underwater for 1 minute and 30 seconds continuously with drain pump on 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 Malfunction of drain pump Defective drain Clogged drain pump Clogged drain pipe Defective drain float switch Catch of drain float switch or malfunction of moving parts cause drain float switch to be detected under water Switch On 4 Defective indoor controller board Check if drain pump works Check drain function Remove drain float switch connector CN4F and check if it is short Switch On with the moving part of float switch UP or OPEN with the moving part of float switch down Replace float switch if it is short with the moving part of float switch down Replace indoor controller board if it is short circuited between of the drain float Switch connector 4 and abnormality reappears It is not abnormal if there is no problem about the above mentioned O Turn the power off and on again to operate after check Error Code Abnormal point and detection method Cause Countermeasure Freezing overheating protection is operating Freezing prot
41. nit has a water leakage abnor Drain pump clogging mality when the following conditions a Drain pipe clogging and b are satisfied while the above Open circuit of float switch Check the resistance of the float switch mentioned detection is performed Contact failure of float switch 0 Check the connector contact failure 8 The intake temperature subtracted connector with liquid pipe temperature detects to Dew condensation on float switch Check the float switch leadwire mounted be less than 10 C 14 F for a total of Drain water descends along Check the filter clogging 30 minutes When the drain sensor lead wire is detected to be NOT soaked in the Drain water waving due to filter water the detection record of a and b clogging will be cleared amp Extension piping connection amp Check the piping connection b Drain float switch detects to be in the difference at twin triple quad water for more than 15 minutes ruple system Once the water leakage abnormality is Miswiring of indoor outdoor Check the indoor outdoor connecting wires detected abnormality state will not be connecting at twin triple quad released until the main power is reset ruple system Room temperature thermistor Check the room temperature display of liquid pipe temperature thermis remote controller tor detection is defective Check the indoor liquid pipe temperature dis play of outdoor controller board Remote
42. nk Off On On On On Off On On On pattern Self check 2 5 sec Approx 3 sec 0 5 sec 0 5 sec 0 5 sec 0 5 sec Approx 2 5 sec Approx 3 sec 0 5 sec 0 5 sec starts M v J 0 Start signal PEN received Number of blinks beeps in pattern indicates the check Number of blinks beeps in pattern indicates code in the following table i e 5 for U2 the check code in the following table Output pattern A Errors detected by indoor unit IR wireless remote controller Wired remote controller Beeper sounds OPERATION INDICATOR lamp blinks O Check code Symptom Remark Number of times 1 P1 Intake sensor error 2 P2 Pipe TH2 sensor error P9 Pipe TH5 sensor error 3 E6 E7 Indoor outdoor unit communication error 4 P4 Float switch connector CN4F open 5 P5 Drain pump error PA Forced compressor stop due to water leakage abnormality 6 P6 Freezing Overheating protection operation 7 EE Communication error between indoor and outdoor units 8 P8 Pipe temperature error 9 4 E5 Remote controller signal receiving error 10 E 11 Is 12 Fb Indoor unit control system error memory error etc Remote controller transmission error 2 Remote controller control board error Output pattern B Errors detected by unit other than indoor unit outdoor unit etc IR wireless remote controller Wired remote controller Beeper sounds
43. nt 4 When performing service install a filter drier simultaneously Be sure to use a filter drier for new refrigerant 2 Additional refrigerant charge When charging directly from cylinder Check that cylinder for RA10A on the market is syphon type Charging should be performed with the cylinder of syphon stood vertically Refrigerant is charged from liquid phase 3 3 Service tools Use the below service tools as exclusive tools for R410A refrigerant Tool name Specifications Gauge manifold Only for RA10A Use the existing fitting specifications UNF 1 2 Use high tension side pressure of 5 3MPa G or over Charge hose Only for RA10A Use pressure performance of 5 09MPa G or over Electronic scale m Gas leak detector Use the detector for R134a R407C or R410A Adaptor for reverse flow check Attach on vacuum pump Refrigerant charge base Refrigerant cylinder Only for RA10A Top of cylinder Pink Oylinder with syphon Refrigerant recovery equipment 3 PART NAMES AND FUNCTIONS e Indoor unit Front grille ir inlet NN OD 3 ISSR ic Emergency operatlon 2E switc ET Q Air outlet T Vane Wired remote controller Option Display Section Day of Week Shows the current
44. nts setting 22 Cut in Function ON Set point Set temp 4 7 5 F a Cut in Function ON Set point Set temp 6 C 10 8 F IL 524 Function ON Set point Set temp 8 C 14 4 F EE 27 2 Setting method of each function by wired remote controller MITSUBISHI ELECTRIC B Refrigerant address 1 FETA E C Data display area D Request code display area 13 oa gig FQ Ji TEMP CDON OFF D vem CA Qum E B 8 OMENU hall S auten EP Gs amp 5522 CHEK TEST ue qu GD Gp 5 PAR 21MAA CLEARN 8 1 Stop operation 2 Press the TEST button for seconds so that Maintenance mode appears on the screen After a while 00 appears in the refrigerant address number display area at amp 3 Press the CHECK button for seconds to switch to Maintenance monitor Note It is not possible to switch to Maintenance monitor during data request in maintenance mode i e while is blinking since no buttons are operative appears on the screen when Maintenance monitor is activated The display now allows you to set a request code No 4 Press the TEMP Y and A buttons m to select the desired refrigerant address 5 Press the CLOCK V7 and A buttons
45. of refrigerant Disconnected holder of pipe liquid or condenser evaporator thermistor Defective refrigerant circuit Converse connection of extension pipe on plural units connection Converse wiring of indoor outdoor unit connecting wire on plural units connection Defective detection of indoor room temperature and pipe lt condenser evaporator gt temperature thermistor Stop valve is not opened completely Check pipe liquid or condenser evap orator temperature with room tempera ture display on remote controller and outdoor controller circuit board Pipe liquid or condenser evaporator gt temperature display is indicated by set ting SW2 of outdoor controller circuit board as follows controller circuit board after connecting Conduct temperature check with outdoor A Control Service Tool PAC SK52ST Check converse connection of extension pipe or converse wiring of indoor outdoor unit connecting wire Error Code Abnormal point and detection method Cause Countermeasure Pipe temperature thermistor Defective thermistor Check resistance value of thermistor Condenser Evaporator TH5 characteristics For characteristics refer to P1 above The unit is in 3 minute resume protec Contact failure of connector Check contact failure of connector CN44 tion mode if short open of thermistor is CN44 on the indoor controller the indoor controller bo
46. ostat Remote controller amp built in Noise level Low Middle High dB 43 46 49 Field drain pipe I D mm in 16 5 8 Dimensions mm in 1170 46 1 16 mm in 295 11 5 8 mm in 365 14 3 8 5 NOISE CRITERION CURVES PKA A24KA4 TH NOTGHISBUGET UNE PKA A36KA4 TH NOTCH SPL dB LINE 4 High 45 o High 49 0 9 Low 39 e e Low 43 90 90 T T 80 80 e ps B E Be F i 8 8 Lf F 3 lt 70 70 E F T 1 4 NC 70 d i 1 1 E a M NEA m m j 1 i 60 60 d i i 1 gt ES 3 3 60 T Par E m fo 50 E F 1 1 8 c a 40 a 2 40 2 o 2 o 9 30 a 5 3 I T F I I amp 40 APPROXIMATE F ag APPROXIMATE THRESHOLD OF 2627 ONCE THRESHOLD HEARINGFOR 4 X F HEARING FOR 1 1 CONTINUOUS CONTINUOUS 3 NOISE ES NOISE t t E J 3 10 I T i i 10 T T 63 125 250 500 1000 2000 4000 8000 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCI
47. peration 1 Rotation function and Back up function Outline of functions Main and sub units operate alternately according to the interval of rotation setting Main and sub unit should be set by refrigerant address Outdoor Dip switch setting Refrigerant address 00 gt Main unit Refrigerant address 01 Sub unit When error occurs to one unit another unit will start operation Back up function System constraint This function is available only by the grouping control system INDOOR UNIT OUTDOOR UNIT 1 1 of 2 refrigerant groups Refer to Fig 1 Main indoor unit should be connected for wired remote controller and the transmission line TB5 for main and sub unit should also be connected Refer to Fig 1 This function cannot be set by wireless remote controller Set refrigerant address of each unit Dip switch on the outdoor unit Refrigerant address 00 01 Operation pattern Fig 1 Refrigerant address Refrigerant address Back up function only Request code number 312 Error occurs on main unit Start operation Main Sub Rotation function amp Back up function Request code number 313 318 Error occurs on main unit Start operation Main Sub Sub Main Sub OC Outdoor unit Main IC Indoor unit a x PSP Abnormal condition lt Nahe Ron Stop RC Wired remote controller Sub unit IC 2 H 1 1
48. peration of the outdoor unit refer to the outdoor unit wiring diagram 3 Before you activate Emergency Operation check the following points 1 Emergency operation cannot be activated when the outdoor unit malfunctions the indoor fan malfunctions when it has detected the malfunction of drain pump during self diagnosing 2 Emergency Operation becomes continuous only by switching the power source on off ON OFF on the remote control or temperature control etc does not function 3 Avoid operating for a long time when the outdoor unit begins defrosting while Emergency Operation of the heating is activated because it will start to blow cold air 4 Emergency cooling should be limited to 10 hours maximum The indoor unit heat exchanger may freeze 5 After Emergency Operation has been deactivated set the switches etc to their original positions 6 Movement of the vanes does not work in Emergency operation therefore you have to slowly set them manually to the appropriate position 21 9 6 HOW CHECK THE PARTS 24 4 Parts name PKA A30KA4H TH Check points PKA A36KA4 TH Room temperature thermistor 1 Liquid pipe thermistor TH2 Condenser evaporator temperature thermistor TH5 Disconnect the connector then measure the resistance using a tester At the ambient temperature 50 F 86 F Abnormal Open or short Normal 4 3kQ 9 6kQ Refer to the next page for a detai
49. quid pipe thermistor and cond eva thermis tor 5 Disconnect the connector CN44 on the indoor controller board Photo 7 Cond eva thermistor TH5 y Liquid pipe thermistor TH2 PHOTOS Screw of the motor band Lead wire of pipe ther mistor Screws of the motor bed Screw of the line flow fan 31 OPERATION PROCEDURE 8 REMOVING THE HEAT EXCHANGER Photo 11 Heat exchanger PHOTOS Water Cut 1 Remove the panel and the corner box Refer to step 1 2 Remove the electrical box Refer to step 3 and the nozzle assembly Refer to step 4 3 Remove the water cut 4 Remove the pipe thermistors from each holder 5 Disconnect the connector for ground wire 6 Remove 3 screws fixing the left side of the heat exchanger See Photo 9 7 Remove the heat exchanger Photo 12 Lead wire for TH5 Connector for ground Liquid pipe thermistor TH2 9 REMOVING THE ROOM TEMPERATURE THERMISTOR 1 Remove the panel and corner box Refer to step 1 2 Remove the electrical box covers 3 Remove the room temperature thermistor 4 Disconnect the connector CN20 on the indoor controller Indoor controller board I B board 4 Room temp thermistor TH1 HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO LTD New publication effective Nov 2010 Dist
50. ress is incorrect 14 On IR wireless remote controller The continuous buzzer sounds from receiving section of indoor unit Blink of operation lamp On wired remote controller Check code displayed in the LCD Refer to the previous page check code the unit cannot be operated properly after the test run refer to the following table to find out the cause Symptom Wired remote controller LED 1 2 PCB in outdoor unit Cause For about 2 minutes after power on PLEASE WAIT After LED 1 2 are lighted LED 2 is turned off then only LED 1 is lighted Correct operation For about 2 minutes following power on op eration 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 Display messages do not appear even when operation Switch is turned ON operation lamp does not light up Only LED 1 is lighted LED 1 2 blink Connector for the outdoor unit s protection device is not connected Reverse or open phase wiring for the outdoor unit s power terminal block L1 L2 GR Only LED 1 is lighted gt LED 1 blinks twice LED 2 blinks once Incorrect wiring between indoor and outdoor units incorrect polarity of S1 S2 S3 Remote controller wire short On the IR wireless remote controller with condition above following phenomena take pl
51. ributed in Nov 2010 No OCH488 Specifications subject to change without notice Made in Japan
52. signals Contact failure short circuit or miswiring converse wiring of indoor outdoor unit connecting wire Q Defective transmitting receiving circuit of outdoor controller circuit board Defective transmitting receiving circuit of indoor controller board Noise has entered into indoor outdoor unit connecting wire Check LED display on the outdoor control circuit board Connect A control service tool PAC SK52ST Refer to EA EC item if LED displays EA EC 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 2 0 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 indoor controller board receives 1 30 times continuously when indoor controller board transmits 0 signal 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 read normally from the nonvolat
53. te controller IR wireless remote controller RF thermostat 9 o E 2 1 ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal all supply circuits must be disconnected 2 SAFETY PRECAUTION 2 2 CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilising refrigerant RA10A Use new refrigerant pipes Do not use refrigerant other than R410A Make sure that the inside and outside of refrige rant piping is clean and it has no contaminants which are hazards to refrigerant cycle In addition use pipes with specified thickness If other refrigerant R22 etc is used chlorine in refrige rant can cause deterioration of refrigerant oil etc such as sulfur oxides dirt shaving particles etc Use a vacuum pump with a reverse flow check valve Contamination inside refrigerant piping can cause deterio ration of refrigerant oil etc Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil etc Store the piping to be used indoors during installation and keep both ends of the piping sealed until just before brazing Leave elbow joints etc in their packaging Use the following tools specifically designed for use with R410A refrigerant If dirt dust or moisture enters into refrigerant cycle that can cause deterior
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