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Mitsubishi Electric PKA-A12HA, Service Manual, Page: 33 / 36

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Mitsubishi Electric PKA-A12HA Service Manual Download Page 33

33

8. REMOVING THE LIQUID PIPE THERMISTOR AND 
 COND/EVA 

TEMP. 

THERMISTOR

(1) Remove the front panel. (Refer to 2)
(2) Remove the electrical box cover.
(3) Remove the motor band.
(4) Cut the wiring fixed band.
(5) Remove the liquid pipe thermistor and cond/eva temp. ther-

mistor.

(6) Disconnect the connector (CN44) on the indoor 
 controller 

board.

Photo 13

Liquid pipe thermistor (TH2)

Condenser/evaporator temp.  
thermistor (TH5)

Heat exchanger

9. REMOVING THE HEAT EXCHANGER

(1) Remove the front panel (Refer to 2.) and the corner panel
   at right lower side.
(2) Remove the electrical box (Refer to 4.) and the nozzle 
   assembly (Refer to 5.).
(3) Remove the motor band.
(4) Remove the pipe thermistors (Refer to 8.).
(5) Disconnect the connector (CN60) on the indoor controller 
   board and the connector for ground wire. (See Photo 6)
(6) Remove the screws fixing the left side of the heat 
   exchanger. (See Photo 10)
(7) Remove the heat exchanger.

10. REMOVING THE ROOM TEMPERATURE THERMISTOR

(1) Remove the front panel (Refer to 2.).
(2) Remove the electrical box cover.
(3) Remove the room temperature thermistor.
(4) Disconnect the connector (CN20) on the indoor controller
  

board.

NOTE: When room temp. thermistor is replaced, be sure 

to use service parts No. R01 N20 202. 

Photo 14

Photo 15

Electrical box cover (top)

Electrical box cover (side)

Screw (side cover)
Screw (top cover)

Switch board cover

Holder of wireless
controller board

Nozzle assembly

Water cover

Screw
(side
cover)

Room temp. thermistor 
(TH1)

Wire clip

Heat exchanger

Electrical box

PHOTOS

OPERATION PROCEDURE

Summary of Contents for PKA-A12HA

Page 1: ...NCTIONS 4 4 SPECIFICATIONS 7 5 NOISE CRITERION CURVES 8 6 OUTLINES AND DIMENSIONS 9 7 WIRING DIAGRAM 10 8 REFRIGERANT SYSTEM DIAGRAM 11 9 TROUBLESHOOTING 12 10 SPECIAL FUNCTION 27 11 DISASSEMBLY PROCEDURE 30 Indoor unit Model names Service Ref PARTS CATALOG OCB456 No OCH456 March 2009 INDOOR UNIT PKA A12HA PKA A12HA PKA A18HA PKA A18HA PKA A12HAL PKA A12HAL PKA A18HAL PKA A18HAL ON OFF TEMP COOL D...

Page 2: ...ice Ref Service Manual No PUZ A18 24 36NHA3 PUZ A18 24 36NHA3 BS PUY A12 18 24 36NHA3 PUY A12 18 24 36NHA3 BS OCH458 OCB458 PUZ HA36NHA2 OCH426 OCB426 1 2 TECHNICAL DATA BOOK Series Outdoor unit Data Book No PUZ A NHA3 BS PUY A NHA3 BS OCS14 PUZ HA NHA2 OCS15 ...

Page 3: ...t cycle that can cause deterioration of refrigerant oil or malfunction of com pressor 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 Flare tool Electronic refrigerant charging scale Vacuum pump adaptor Size adjustment gauge Gauge manifold Torque wrench Gas leak detector Charge hose Tools for R410A Contami...

Page 4: ...5 3MPa G or over 2 Charge hose Only for R410A 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 3 PART NAMES AND FUNCTIONS Indoor...

Page 5: ...e 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 Louver display Indicates the action of the swing louver Does not appear if the louver is not running Power On indicator Indicates that the power is on Fan Speed indicator Shows the selected fan speed Ventilation indicator Appears when the unit is running in Ven...

Page 6: ...n timer operation or when setting timer button Sets any desired room temperature CLOCK display Displays the current time display Displays the 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 Temperature setting display Indicates the desired temperature setting which is set display D...

Page 7: ...11 290 335 380 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 60Hz 208 230V 15 1 Plate fin coil 0 direct blow Remote controller built in A A kW F L A min CFM Pa mmAq dB mm in mm in mm in mm in kg lbs Service Ref Power supply phase cycle voltage Max Fuse Size Min Circuit Ampacity External finish Heat exchanger Fan Fan drive No Fan motor outp...

Page 8: ...0 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 A12HA PKA A18HA PKA A12HAL PKA A18HAL High NOTCH Low 43 SPL dB 36 LINE UNIT WALL 3 3ft 3 3ft MICROPHONE ...

Page 9: ...115 6 13 16 174 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 only PKA A HA models 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 24 610 Drain hose 7 3 16 184 ...

Page 10: ...am above are Connector Terminal block 2 Indoor and outdoor connecting wires have poIarities 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 syst...

Page 11: ...iner 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 A12HA PKA A18HA PKA A12HAL PKA A18HAL ...

Page 12: ... to 9 4 Troubleshooting by inferior phenomena The trouble is not reoccurring Logged Not logged Consider the temporary defects such as the work of 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 ...

Page 13: ...REMOTE CONTROLLER In 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 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 refrig...

Page 14: ... Number of times Wireless remote controller Wired remote controller Beeper sounds OPERATION INDICATOR lamp blinks Check code Number of times Wireless remote controller Wired remote controller 1 P1 Intake sensor error P9 Pipe TH5 sensor error 2 P2 Pipe TH2 sensor error 3 E6 E7 Indoor outdoor unit communication error 4 P4 Float switch connector CN4F open 5 P5 PA Drain pump error Forced compressor st...

Page 15: ...ot connected 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 ...

Page 16: ... 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 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 controlle...

Page 17: ...c tive Defective outdoor fan control Overcharge of refrigerant Defective refrigerant circuit clogs Bypass circuit of outdoor unit is defective Cooling or drying mode Check clogs of the filter Remove shields Refer to 9 6 Check outdoor fan motor Check operating condition of refrigerant circuit Heating mode Check clogs of the filter Remove shields Refer to 9 6 Check outdoor fan motor Check operating ...

Page 18: ...hen the above mentioned problem of are not applied Diagnose remote controllers a When RC OK is displayed remote con trollers have no problem Turn the power off and on again to check If abnormality generates again replace indoor controller board b When RC NG is displayed replace remote controller c When RC E3 or ERC 00 06 is dis played noise may be causing abnormality If the unit is not normal afte...

Page 19: ...normal point and detection method Cause Countermeasure Fb Indoor controller board Abnormal if data cannot be read normally from the nonvolatile memory of the indoor controller board Defective indoor controller board Replace indoor controller board E1 or E2 Remote controller control board Abnormal if data cannot be read nor mally from the nonvolatile memory of the remote controller control board Er...

Page 20: ...ck S1 and S2 When AC 208 230V is not detected check indoor outdoor unit connecting wire for miswiring When AC 208 230V is detected check below Check the fuse on indoor controller board Check the wiring connection If no problem 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...

Page 21: ...ontroller Check indoor outdoor unit connecting wire for connection failure Check the connection of remote con troller wires in case of twin indoor unit system When 2 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...

Page 22: ...or unit operates as follows 1 Indoor fan is running at high speed Note on the 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 microcomputer has failed it is nesessary to proceed with points 2 and 3 below as in the case of the wired remote control 2 When yo...

Page 23: ...or a detail Room temperature thermistor TH1 Liquid pipe thermistor TH2 Condenser evaporator temperature thermistor TH5 Normal 4 3k 9 6k 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 15k 3 Fixed number of B 3480 2 t Rt 15exp 3480 0 10 20 25 3...

Page 24: ... connector VDC DC294 325V TEST POINT VCC between 4 and 3 of the fan connector VCC DC15V 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 Yes No Check the operation of fan END Yes OK Check the operation END OK Check method of DC fan motor fan motor indoor controller c...

Page 25: ...onnector SW1 Model selection SW2 Capacity setting CN151 Connect to the vane motor MV Jumper wire J41 J42 Pair No setting for wireless remote controller CN01 Connect to the Terminal block TB4 1 3 208 230VAC 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 terminal block TB5 Remote controller...

Page 26: ...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 Marks in the table below Jumper wire Short Open For product Spare parts Indoor controller board type JP3 With JP3 Without JP3 MODELS SETTING PKA A HA L MODELS SETTING A12 A18 ON OFF 1 ...

Page 27: ... of functions Main and sub units operate alternately according to the interval of rotation setting w 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 available only by the grouping contr...

Page 28: ...ck 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 contents In...

Page 29: ...ars on the screen when Maintenance monitor is activated The display now allows you to set a request code No 4 Press the TEMP and buttons to select the desired refrigerant address 5 Press the CLOCK and buttons to set the desired request code No 311 318 321 324 6 Press the button to perform function setting If above setting operations are done correctly Request code number will appear in data displa...

Page 30: ...f 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 the pa...

Page 31: ...ectrical 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 and switch board 7 Remove the holder of wireless controller board 8 Disconnect the connector of wireless controller board and remove the wirel...

Page 32: ...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 11 8 Lift the heat exchanger and pull out the line flow fan to the lower left Photo 9 Photo 10 7 REMOVING THE VANE MOTOR 1 Remove the nozzle assembly Refer to 5 2 Remove the screws of the vane motor unit and pull out the vane motor unit 3 Remove the screws of the vane m...

Page 33: ...e thermistors Refer to 8 5 Disconnect the connector CN60 on the indoor controller board and the connector for ground wire See Photo 6 6 Remove the screws fixing the left side of the heat exchanger See Photo 10 7 Remove the heat exchanger 10 REMOVING THE ROOM TEMPERATURE THERMISTOR 1 Remove the front panel Refer to 2 2 Remove the electrical box cover 3 Remove the room temperature thermistor 4 Disco...

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Page 36: ...UNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN CCopyright 2009 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Mar 2009 No OCH456 PDF 7 Made in Japan New publication effective Mar 2009 Specifications subject to change without notice TM ...

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