Mitsubishi Electric PKA-A12HA6 Service Manual Download Page 36

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HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN

Distributed in Dec. 2014 No. OCH580

Made in Japan

New publication, effective Dec. 2014

Specifications are subject to change without notice.

Summary of Contents for PKA-A12HA6

Page 1: ... 5 NOISE CRITERION CURVES 11 6 OUTLINES AND DIMENSIONS 12 7 WIRING DIAGRAM 13 8 REFRIGERANT SYSTEM DIAGRAM 14 9 TROUBLESHOOTING 15 10 SPECIAL FUNCTION 29 11 DISASSEMBLY PROCEDURE 32 Indoor unit Model Name Service Ref PARTS CATALOG OCB580 INDOOR UNIT PKA A12HA6 PKA A12HA6 PKA A18HA6 PKA A18HA6 WIRED REMOTE CONTROLLER Option IR WIRELESS REMOTE CONTROLLER Option December 2014 No OCH580 ON OFF TEMP CO...

Page 2: ...A6 BS PUZ A18 24 30 36NHA6 PUZ A18 24 30 36NHA6 BS OCH577 OCB577 PUY A12 18 24 30 36NHA6 PUY A12 18 24 30 36NHA6 BS PUY A12 18 24 30 36NHA6 PUY A12 18 24 30 36NHA6 BS Radio frequency interface Wired remote controller IR wireless remote controller ON OFF TEMP COOL DRY AUTO FAN HEAT RF thermostat Remote controller Optional parts OCH580 ...

Page 3: ... must be ester oil ether oil or alkylbenzene oil in a small amount Make sure that the inside and outside of refrige rant piping is clean and it has no contaminants such as sulfur oxides dirt shaving particles etc which are hazards to refrigerant cycle In addition use pipes with specified thickness Store the piping indoors and both ends of the piping sealed until just before brazing Leave elbow joi...

Page 4: ... Use pressure performance of 5 09MPa G or over 3 Electronic scale 4 Gas leak detector Use the detector for R134a R407C or R410A 5 Adaptor for reverse flow check Attach on vacuum pump 6 Refrigerant charge base 7 Refrigerant cylinder Only for R410A Top of cylinder Pink Cylinder with syphon 8 Refrigerant recovery equipment 2 Additional refrigerant charge When charging directly from cylinder Check tha...

Page 5: ...e Main menu 5 Backlit LCD Operation settings will appear When the backlight is off pressing any button turns the backlight on and it will stay lit for a certain period of time depending on the screen When the backlight is off pressing any button turns the backlight on and does not perform its function except for the ON OFF button 6 ON OFF lamp This lamp lights up in green while the unit is in oper...

Page 6: ...9 Indicates the louver setting Indicates the ventilation setting Appears when the preset temperature range is restricted 1 Operation mode Indoor unit operation mode appears here 2 Preset temperature Preset temperature appears here 3 Clock See the Installation Manual Current time appears here 4 Fan speed Fan speed setting appears here 5 Button function guide Functions of the corresponding buttons a...

Page 7: ... power Weekly timer Restriction Maintenance Initial setting On Off timer Auto Off timer Temp range Operation lock Manual vane angle Main Sub Timer Main display Contrast Display details Auto mode Administrator password Language selection Service Input maintenance info Function setting Lossnay City Multi only Check Self check Maintenance password Remote controller check Test run Clock Auto descendin...

Page 8: ...to be registered in advance to be displayed 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 ...

Page 9: ...e order of timer operation display Displays whether timer is on or off Buttons used to set the hour and minute of the current time and timer settings h and min buttons display display FAN SPEED display indicates which fan speed has been selected display The vertical direction of air flow is indicated display Blinks when model is selected display display CHECK and TEST RUN display indicate that the...

Page 10: ...90 335 380 0 direct blow Remote controller built in 36 40 43 16 5 8 898 35 3 8 249 9 13 16 295 11 5 8 13 29 1 phase 60 Hz 208 230 V 15 1 Plate fin coil 0 direct blow Remote controller built in A A kW F L A K min CFM Pa mmAq dB mm in mm in mm in kg lb Service Ref Power supply phase cycle voltage Max Fuse Size Min Circuit Ampacity External finish Heat exchanger Fan Fan drive o No Fan motor output Fa...

Page 11: ...000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB 0dB 0 0002 µbar BAND CENTER FREQUENCIES Hz PKA A12HA6 PKA A18HA6 High NOTCH Low 43 SPL dB 36 LINE UNIT WALL 3 3ft 3 3ft MICROPHONE OCH580 ...

Page 12: ...4 8 3 8 213 9 5 16 238 10 15 16 278 3 15 1 2 394 11 1 16 281 17 5 8 449 0 Emergency operation switch cooling heating Terminal block for MA remote controller Terminal block for power supply option Front side Grille open Terminal block for indoor outdoor connecting line 17 15 16 457 Gas pipe 21 3 16 539 Liquid pipe 6 5 8 169 6 3 16 158 Drain hose 7 3 16 184 250mm 9 13 16inch or greater with optional...

Page 13: ...DE MODELS PKA A12HA6 PKA A18HA6 ON OFF 1 2 3 4 5 ON OFF 1 2 3 4 5 W B RFI CNRU WHT LD101 B REC1 LED1 LED2 6 2 5 RU Symbol Name Symbol Name I B Indoor controller board FUSE FUSE T3 15AL250V RFI Radio frequency interface for RF thermostat CN2L Connector LOSSNAY CN30 Connector LLC CN105 Connector Radio frequency interface CN152 Connector Back up heating CN90 Connector Remote operation adapter Connect...

Page 14: ...h strainer 50 50 Thermistor TH5 Cond Eva temperature Thermistor TH1 Room temperature Refrigerant flow in cooling Refrigerant flow in heating Strainer 50 Strainer 50 Heat exchanger Refrigerant GAS pipe connection Flare Refrigerant LIQUID pipe connection Flare PKA A12HA6 PKA A18HA6 OCH580 ...

Page 15: ... of the trouble according to 9 4 TROUBLESHOOTING BY INFERIOR PHENOMENA The trouble is not reoccurring Logged Not logged 1Consider the temporary defects such as the work of protection devices in the refrigerant circuit including compressor poor connection of wiring noise etc Re check the symptom and check the installation environment refrigerant amount weather when the trouble occurred matters rela...

Page 16: ...e 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 CHECK lights and refrigerant address 00 blinks Check that the remote controller s display has stopped before continuing Select the refrigerant address of the indoor unit for the self diagnosis Note Set refrigerant address using the ...

Page 17: ...ired remote controller Beeper sounds OPERATION INDICATOR lamp blinks Check code Number of times IR wireless remote controller Wired remote controller 1 P1 Intake sensor error P9 Pipe TH5 sensor error 2 P2 Pipe TH2 sensor error 3 E6 E7 Indoor outdoor unit communication error 4 P4 Float switch connector CN4F open 5 P5 PA Drain pump error Forced compressor stop due to water leakage abnormality 6 P6 F...

Page 18: ...ed Reverse or open phase wiring for the outdoor unit s power terminal block L1 L2 GR Incorrect wiring between indoor and outdoor units incorrect polarity of S1 S2 S3 Remote controller wire short Note Operation is not possible for about 30 seconds after cancellation of function selection Correct operation For description of each LED LED1 2 3 provided on the indoor controller refer to the following ...

Page 19: ...rmistor wiring 4 Defective refrigerant circuit is causing thermistor temperature of 194 F 90 or more or 40 F 40 or less 5 Defective indoor controller board 1 3 Check resistance value of thermistor For characteristics refer to P1 above 2 Check contact failure of connector CN44 on the indoor controller board Refer to 9 7 TEST POINT DIAGRAM Turn the power on and check restart after inserting connecto...

Page 20: ...ctive refrigerant circuit clogs Heating mode 1 Clogged filter reduced airflow 2 Short cycle of air path 3 Over load high temperature operation out of the tolerance range 4 Defective indoor fan motor Fan motor is defective Indoor controller board is defec tive 5 Defective outdoor fan control 6 Overcharge of refrigerant 7 Defective refrigerant circuit clogs 8 Bypass circuit of outdoor unit is defect...

Page 21: ...ive Drain pump clogging Drain pipe clogging 3 Open circuit of float switch 4 Contact failure of float switch connector 5 Dew condensation on float switch Drain water descends along lead wire Drain water is waving due to filter clogging 6 Extension piping connection dif ference at twin triple or quadru ple system 7 Miswiring of indoor outdoor con necting at twin triple or quadru ple system 8 Room t...

Page 22: ...ller E3 or E5 Remote controller transmission error E3 signal receiving error E5 1 Abnormal if remote controller could not find blank of transmission path for 6 sec onds and could not transmit Check code E3 2 Remote controller receives transmitted data at the same time and compares the received and transmitted data Abnormal if these data are judged to be different 30 continuous times Check code E3 ...

Page 23: ...r Normal operation Each connector on vane motor side is disconnected or set ting the fixed vanes by wired remote controller Phenomena Cause Countermeasure 2 Receiver for IR wireless remote controller Weak batteries of IR wireless remote controller Contact failure of connector CNB on IR wireless remote controller board Insert failure Contact failure of connector CN90 on indoor con troller board Ins...

Page 24: ...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 contr...

Page 25: ...to 9 6 1 Thermistor Room temperature thermistor TH1 Liquid pipe thermistor TH2 Condenser evaporator temperature thermistor TH5 Normal 4 3 to 9 6 k Abnormal Open or short 9 6 1 Thermistor Thermistor Characteristic graph Room temperature thermistor TH1 Pipe temperature thermistor liquid TH2 Condenser evaporator temperature thermistor TH5 Thermistor R0 15 k 3 Fixed number of B 3480 2 t Rt 15exp 3480 ...

Page 26: ...ctor VDC 294 325 V DC TEST POINT 2 VCC between 4 and 3 of the fan connector VCC 15 V DC Wiring recovery Replace the indoor controller board Replace the fan motor Replace the indoor controller board Replace the fan motor Is the voltage normal Is there contact failure No 1 2 Yes No Check the operation of fan END Yes OK Check the operation END OK Check method of DC fan motor fan motor indoor controll...

Page 27: ...250 V SWE Emergency operation connector SW1 Model selection SW2 Capacity setting CN151 Connect to the vane motor MV Jumper wire J41 J42 Pair No setting for IR wireless remote controller CN01 Connect to the Terminal block TB4 1 3 208 230 V AC LED1 Power supply I B LED2 Power supply R B LED3 Transmission Indoor outdodr CN3C Transmission Indoor outdodr DC 0 24V CN30 Connector LLC CN22 Connect to the ...

Page 28: ...ontroller setting Control PCB setting J41 J42 Initial setting IR wireless remote controller 0 Control PCB for both J41 and J42 4 pair number settings are supported The pair number settings of the wireless remote controller and indoor control PCB J41 J42 are given in the table on the left in the table indicates the jumper wire is dis connected Jumper wire Short Open For product Spare parts Indoor c...

Page 29: ...nd Back up function Outline of functions Main and sub units operate alternately according to the interval of rotation setting Note Main and sub unit should be set by refrigerant address Outdoor DIP switch setting Refrigerant address 00 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 availa...

Page 30: ... and back up function No 5 314 Rotation ON Alternating interval 3day and back up function No 6 315 Rotation ON Alternating interval 5day and back up function No 7 316 Rotation ON Alternating interval 7day and back up function No 8 317 Rotation ON Alternating interval 14day and back up function No 9 318 Rotation ON Alternating interval 28day and back up function Setting No Request code Setting cont...

Page 31: ...r Error history Refrigerant volume check Refrigerant leak check Smooth maintenance Request code Request code Request Cursor Ref address 0 Request code 004 3 Enter the current maintenance password 4 numerical digits Move cursor to the digit you wat to change with the F1 or F2 button Set each number 0 through 9 with the F3 or F4 button Note The initial maintenance password is 9999 4 Then press the b...

Page 32: ...side of indoor unit and remove the hook Figure 1 2 REMOVING THE FRONT PANEL 1 Press and unlock the knobs on both sides of the front panel and lift the front panel until it is level Pull the hinges forward to remove the front panel See Photo 2 2 Move the horizontal vanes in a downward direction 3 Remove the screw caps of the panel Remove the screws See Photo 1 4 Hold the lower part of both ends of ...

Page 33: ... AND IR WIRELESS CONTROLLER BOARD 1 Remove the front panel Refer to step 2 2 Remove the room temp thermistor TH1 see Photo 3 3 Remove the electrical box covers screw 4 12 See Photo 3 4 Disconnect the connectors on the indoor controller board 5 Remove the switch board cover 6 Pull out the indoor controller board toward you then disconnect the rest of connectors Remove the indoor controller board an...

Page 34: ...r band Remove the motor band Pull out the indoor fan motor 7 Remove the screws fixing the left side of the heat exchanger See Photo 10 8 Lift the heat exchanger and pull out the line flow fan to the lower left Photo 8 Photo 9 7 REMOVING THE VANE MOTOR 1 Remove the nozzle assembly Refer to step 5 2 Remove the screws of the vane motor unit and pull out the vane motor unit 3 Remove the screws of the ...

Page 35: ...nect the connector CN60 on the indoor controller board and the connector for ground wire See Photo 5 6 Remove the screws fixing the left side of the heat exchanger See Photo 9 7 Remove the heat exchanger 10 REMOVING THE ROOM TEMPERATURE THERMISTOR 1 Remove the front panel Refer to step 2 2 Remove the electrical box cover 3 Remove the room temperature thermistor 4 Disconnect the connector CN20 on t...

Page 36: ... 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN CCopyright 2014 MITSUBISHI ELECTRIC CORPORATION Distributed in Dec 2014 No OCH580 Made in Japan New publication effective Dec 2014 Specifications are subject to change without notice ...

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