Mitsubishi Electric Mr. Slim PLA-A12BA Service Manual Download Page 15 | Manualshive

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Thermistor TH2
Pipe temperature (Liquid)

Distributor
with strainer (#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)

9

REFRIGERANT SYSTEM DIAGRAM

PLA-A12BA

PLA-A18BA

PLA-A24BA

PLA-A30BA

PLA-A36BA

PLA-A42BA

PLA-A12BA

1

PLA-A18BA

1

PLA-A24BA

1

PLA-A30BA

1

PLA-A36BA

1

PLA-A42BA

1

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Summary of Contents for Mr. Slim PLA-A12BA

Page 1: ...ribes only service data of the indoor units RoHS compliant products have G mark on the spec name plate PARTS CATALOG OCB420 WIRED REMOTE CONTROLLER WIRELESS REMOTE CONTROLLER ON OFF TEMP ON OFF TEMP INDOOR UNIT Model name indication No OCH420 REVISED EDITION A October 2007 PLA A12BA PLA A12BA1 PLA A18BA PLA A18BA1 PLA A24BA PLA A24BA1 PLA A30BA PLA A30BA1 PLA A36BA PLA A36BA1 PLA A42BA PLA A42BA1 ...

Page 2: ...PUZ HA36NHA OCH426 OCB426 2 1 OUTDOOR UNIT SERVICE MANUAL Series Outdoor unit PUZ A NHA BS PUY A NHA BS Data Book No OCS04 2 2 TECHNICAL DATA BOOK 1 TECHNICAL CHANGES PLA A12BA PLA A12BA1 PLA A18BA PLA A18BA1 PLA A24BA PLA A24BA1 PLA A30BA PLA A30BA1 PLA A36BA PLA A36BA1 PLA A42BA PLA A42BA1 INDOOR CONTROLLER BOARD I B has been changed 11 SPECIAL FUNCTION is added ...

Page 3: ...ing tools are necessary to use R410A refrigerant Keep the tools with care If dirt dust or moisture enters into refrigerant 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 Vac...

Page 4: ...MPa G or over Electronic scale 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 R410A Top of cylinder Pink Cylinder with syphon Refrigerant recovery equipment 2 Additional refrigerant charge When charging directly from cylinder Check that cylinder for R410A on the market is syphon ...

Page 5: ...5 4 PART NAMES AND FUNCTIONS Drain pipe Filter Vane Gas pipe Liquid pipe Air outlet i see sensor option Air intake Intake grille ...

Page 6: ...om 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 Ventilation mode Operation S...

Page 7: ...in 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 ...

Page 8: ...Power supply phase cycle voltage Max Fuse Size Min Circuit Ampacity External finish Panel Heat exchanger Fan Fan drive No Fan motor output Fan motor Airflow Low Medium2 Medium1 High External static pressure Booster heater Operation control Thermostat Noise level Low Medium2 Medium1 High Field drain pipe O D Dimensions Weight W D H INDOOR UNIT PLA A12BA PLA A12BA1 UNIT 840 33 1 16 PANEL 950 37 3 8 ...

Page 9: ... High Field drain pipe O D Dimensions Weight PLA A30BA PLA A30BA1 UNIT 840 33 1 16 PANEL 950 37 3 8 UNIT 840 33 1 16 PANEL 950 37 3 8 UNIT 258 10 3 16 PANEL 35 1 3 8 UNIT 23 51 PANEL 6 13 Single phase 60Hz 208 230V 15 1 Munsell 6 4Y 8 9 0 4 Plate fin coil Turbo fan direct 1 0 05 0 51 Dry 14 16 18 21 490 570 640 740 Wet 13 15 17 20 460 530 600 710 0 direct blow Remote controller built in 28 30 32 3...

Page 10: ...PROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 BAND CENTER FREQUENCIES Hz PLA A24BA PLA A24BA1 PLA A30BA PLA A30BA1 NOTCH SPL dB LINE High 32 Medium1 31 Medium2 29 Low 28 NOTCH SPL dB LINE High 34 Medium1 32 Medium2 30 Low 28 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40...

Page 11: ...OXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 BAND CENTER FREQUENCIES Hz 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 BAND CENTER FREQUENCIES Hz OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 bar OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 bar UNIT...

Page 12: ...nal block Emergency operation switch Cooling Emergency operation switch Heating Indoor unit Ceiling Cut out hole Burring hole pitch 3 1 8 3 2 8 Burring hole Detail drawing of fresh air intake hole Burring hole 14 1 8 Cut out hole Burring hole pitch Cut out hole Detail connecting of Branch duct Both aspects 77 3 1 32 85 3 11 32 298 11 3 4 11 1 16 281 74 80 258 241 2 29 32 3 5 32 10 3 16 PLA A36BA P...

Page 13: ... wiring may change be sure to check the outdoor unit electric wiring for servicing Self diagnosis 1 For details on how to operate self diagnosis with the wireless remote control refer to the technical manuals etc 2 For the wired remote control When you quickly press twice the CHECK switch on the remote control the unit begins self diagnosis and Check Codes generated in the past appear on the displ...

Page 14: ... SDVW DSSHDU RQ WKH GLVSOD W B RU BZ LED1 LED2 SW1 SW2 OPTION PART PCB FOR WIRELESS REMOTE CONTROLLER RECEIVING UNIT BUZZER LED OPERATION INDICATION GREEN LED PREPARATION FOR HEATING ORANGE EMERGENCY OPERATION HEAT DOWN EMERGENCY OPERATION COOL UP H VXUH WR WXUQ RII WKH SRZHU VRXUFH and then disconnect fan motor connector DLOXUH WR GR VR ZLOO FDXVH WURXEOH LQ IDQ PRWRU CN24 CONNECTOR BACK UP HEATI...

Page 15: ...ature Refrigerant flow in cooling Refrigerant flow in heating Strainer 50 Strainer 50 Heat exchanger Refrigerant GAS pipe connection Flare Refrigerant LIQUID pipe connection Flare 9 REFRIGERANT SYSTEM DIAGRAM PLA A12BA PLA A18BA PLA A24BA PLA A30BA PLA A36BA PLA A42BA PLA A12BA1 PLA A18BA1 PLA A24BA1 PLA A30BA1 PLA A36BA1 PLA A42BA1 ...

Page 16: ...occurred and wiring related Reset error code logs and restart the unit after finishing service There is no abnormality in electrical components controller boards and remote controller Recheck the abnormal symptom Identify the cause of the trouble and take a corrective action according to TROUBLESHOOTING BY INFERIOR PHENOMENA 10 4 Continue to operate unit for the time being if the cause is not asce...

Page 17: ...OSIS METHOD BY 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 ...

Page 18: ...er 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 open 5 P5 PA Drain pump error Forced compressor stop due to ...

Page 19: ...s not 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 t...

Page 20: ...istor For characteristics refer to P1 above Check contact failure of connector CN44 on the indoor controller board Refer to 10 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 li...

Page 21: ...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 mode Check clogs of the filter Remove shields Refer to 10 6 Check outdoor fan motor Check operating condition of refrigerant circuit Heating mode Check clogs ...

Page 22: ...remote control ler max 2 units When 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 is displayed d When ERC 00 06 is displayed c d 1RLVH PD EH...

Page 23: ...rmal 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 Erro...

Page 24: ...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 25: ... controller 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 a...

Page 26: ...e control when the remote control does not function it is possible to activate emergency operation by using the indoor unit emergency operation switch SW1 SW2 of the wireless signal receiver board However if the indoor unit microcomputer has failed it is necessary 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 ...

Page 27: ... tester At the ambient temperature of 20 C 68 F 30 C 86 F Vane motor MV Vane motor for i see sensor Option Abnormal Open or short Red Yellow Red Blue Red Orange Red White Connector Normal 300 Measure the resistance between the terminals with a tester At the ambient temperature of 20 C 68 F 30 C 86 F Abnormal Open or short Red Yellow Red Blue Red Orange Red White Connector Normal 250 Normal Do not ...

Page 28: ... board Power supply check Remove the connector CNMF Measure the voltage in the indoor controller circuit board TEST POINT VDC between 1 and 4 of the fan connector VDC DC294 325V TEST POINT VCC between 5 and 4 of the fan connector VCC DC15V Wiring recovery Replace drain pump DP Replace indoor controller board Replace the fan motor Replace indoor controller board I B Replace fan motor MF Replace ind...

Page 29: ...utput DP 208 230V AC CN01 Connect to the Terminal Block TB4 Indoor outdoor connecting line Between and 208 230V AC CNV Vane motor output MV 12V pulse output SWE Emergency operation Jumper wire J41 J42 Pair No setting for wireless remote controller FUSE 6 3A 250V CNMF Fan motor DC 294 325V DC15V DC0 6 5V Stop DC0 or 15V Operation DC7 5V 0 15V pulse VSP Voltage between pins of C626 DC0V FAN stop DC1...

Page 30: ...es the jumper wire is disco nnected There is no jumper JP1 because these models have the cond eva temperature thermistor TH5 Marks in the table below Jumper wire Short Open Without TH5 With TH5 Model JP1 Product Service parts Indoor controller board type JP3 1 2 3 4 5 ON OFF MODELS Service PLA A BA Service PLA A12BA MODELS ON OFF 1 2 3 4 5 Service PLA A30BA MODELS ON OFF 1 2 3 4 5 PLA A18BA ON OFF...

Page 31: ...n function and Back up function Outline of functions Operating the unit of main and sub alternately according to the interval setting Rotation function The setting of main sub unit depends on the refrigerant address The setting of dip switch on the outdoor unit Refrigerant address 00 Main unit Refrigerant address 01 Sub unit If an error occurrs to one unit the other unit starts Back up function Sy...

Page 32: ...ng contents Rotation ON Alternating interval 28days and back up function Rotation ON Alternating interval 14days and back up function Rotation ON Alternating interval 1day and back up function Back up function only No 5 324 Rotation ON Alternating interval 7days and back up function Rotation ON Alternating interval 5days and back up function Rotation ON Alternating interval 3days and back up funct...

Page 33: ...No 311 318 321 324 331 335 6 Press the button to perform function setting If the above operations are set correctly request code number will appear in data display area at Example When the request code number is 311 311 appears on the screen at Refererence You can check the request code number of current setting by setting the request code number 310 320 or 330 and press the button Example When th...

Page 34: ...rd I B 1 Remove the air intake grille and the filter See Figure 1 2 Remove the 2 screws from the electrical box cover 3 Disconnect the connectors CNMF White 7P for fan motor CN44 White 4P for thermistor TH2 TH5 CNP Blue 3P for drain pump CN4F White 4P for float switch CN01 Black 5P for earth and reactor CNV White 20P for vane motor 4 Remove the 6 supports from indoor controller board 5 Remove the ...

Page 35: ...oto 2 3 Remove the turbo fan nut 4 Pull out the turbo fan 5 Remove the wire cover 3 screws 6 Remove 2 wiring clamps 7 Disconnect the connector of the fan motor CNMF 8 Remove the 3 nuts and washers and rubber mounts of the fan motor 7 Removing the drain pan 1 Remove the air intake grille and the filter See Figure 1 2 Remove the 2 screws from the electrical box cover 3 Disconnect the connectors Refe...

Page 36: ... drain pan See photo 6 2 Remove the 3 screws of the piping cover and pull out piping cover 3 Remove the 2 screws of coil plate 4 Remove the 2 screws of the coil 5 Remove the screw of the coil support 6 Pull out the heat exchanger Photo 10 Coil support fixing screw Heat exchanger fixing screw Coil support Heat exchanger Coil plate Piping cover HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKY...

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