Mitsubishi Electric Mr. Slim PLA-A12BA4 Service Manual Download Page 1 | Manualshive

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SERVICE MANUAL

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS

CONTENTS

1. REFERENCE MANUAL ........................ 2
2. SAFETY PRECAUTION ........................ 3
3. PART NAMES AND FUNCTIONS ........ 5
4. SPECIFICATIONS ................................. 8
5. NOISE CRITERION CURVES............. 10
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

NOTE:

• This manual describes only
service data of the indoor units.
• RoHS compliant products have

<G> mark on the spec name
plate.

PARTS CATALOG (OCB482)

WIRED REMOTE

CONTROLLER

(Option)

IR WIRELESS REMOTE

CONTROLLER

(Option)

ON/OFF

TEMP

ON/OFF

TEMP.

INDOOR UNIT

Model name
indication

No. OCH482

November 2010

PLA-A12BA4

PLA-A18BA4

PLA-A24BA4

PLA-A30BA4

PLA-A36BA4

PLA-A42BA4

PLA-A12BA4

PLA-A18BA4

PLA-A24BA4

PLA-A30BA4

PLA-A36BA4

PLA-A42BA4

Indoor unit

[Model names]

[Service Ref.]

3 3 2 2 3

1
2
3
...
»

Summary of Contents for Mr. Slim PLA-A12BA4

Page 1: ...SPECIAL FUNCTION 29 11 DISASSEMBLY PROCEDURE 32 NOTE This manual describes only service data of the indoor units RoHS compliant products have G mark on the spec name plate PARTS CATALOG OCB482 WIRED REMOTE CONTROLLER Option IR WIRELESS REMOTE CONTROLLER Option ON OFF TEMP ON OFF TEMP INDOOR UNIT Model name indication No OCH482 November 2010 PLA A12BA4 PLA A18BA4 PLA A24BA4 PLA A30BA4 PLA A36BA4 PL...

Page 2: ...H481 OCB481 PUZ A18 24 30 36 42NHA4 BS PUZ A18 24 30 36 42NHA4 BS PUY A12 18 24 30 36 42NHA4 PUY A12 18 24 30 36 42NHA4 PUY A12 18 24 30 36 42NHA4 BS PUY A12 18 24 30 36 42NHA4 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 ...

Page 3: ...r 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 Contamination inside refrigerant piping can cause deterio ration...

Page 4: ...r completing service charge the cycle with specified amount of refrigerant 4 When performing service install a filter drier simultaneously Be sure to use a filter drier for new refrigerant No Tool name Specifications 1 Gauge manifold Only for R410A Use the existing fitting specifications UNF1 2 Use high tension side pressure of 5 3MPa G or over 2 Charge hose Only for R410A Use pressure performance...

Page 5: ...5 3 PART NAMES AND FUNCTIONS Drain pipe Filter Vane Gas pipe Liquid pipe Air outlet i see sensor option Air intake Intake grille ...

Page 6: ...erature 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 Section ...

Page 7: ...hen 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 disp...

Page 8: ... Ref 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 A12BA4 UNIT 840 33 1 16 PANEL 950 37 3 8 UNIT ...

Page 9: ...edium1 High Field drain pipe O D Dimensions Weight PLA A30BA4 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 34 32...

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 A24BA4 PLA A30BA4 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 NC 30 NC 20 NC 70 B...

Page 11: ...RESHOLD 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 5ft MICRO...

Page 12: ...h 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 A36BA4 PLA A42BA4 PLA A24BA4 PLA A30BA4 9 ...

Page 13: ... PART PCB FOR IR WIRELESS REMOTE CONTROLLER RECEIVING UNIT BUZZER LED OPERATION INDICATION GREEN LED PREPARATION FOR HEATING ORANGE EMERGENCY OPERATION HEAT DOWN EMERGENCY OPERATION COOL UP Be sure to turn off the source power and then disconnect fan motor connector Failure to do so will cause trouble in Fan motor 1 Use copper supply wires CN24 CONNECTOR BACK UP HEATING CN30 CONNECTOR LLC ROOM TEM...

Page 14: ...ure 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 8 REFRIGERANT SYSTEM DIAGRAM PLA A12BA4 PLA A18BA4 PLA A24BA4 PLA A30BA4 PLA A36BA4 PLA A42BA4 ...

Page 15: ...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 9 4 Continue to operate unit for the time being if the cause is not ascer...

Page 16: ...refrigerant address of the indoor unit for the self diagnosis Note Set refrigerant address using the outdoor unit s DIP switch SW1 For more information see the outdoor unit installation manual If an air conditioner error occurs the indoor unit s sensor emits an intermit tent buzzer sound the operation lamp blinks and the error code is output It takes 3 seconds at most for error code to appear The ...

Page 17: ... times IR wireless remote controller Wired 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 open 5 P5 PA Drain pump error Forced compressor stop due to...

Page 18: ...onnected 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 foll...

Page 19: ...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 Turn the power on and check restart after inserting connector again 4 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 def...

Page 20: ...ange 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 defective Cooling or drying mode 1 Check clogs of the filter 2 Remove blockage 4 Refer to 9 6 5 Check outdoor fan motor 67 Check operating condition of refrigerant circuit...

Page 21: ...he number of connecting remote control ler max 2 units When the above mentioned problem of 1 3 are not applied 4 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 66 is dis played n...

Page 22: ...nt 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 1 Defective indoor controller board 1 Replace indoor controller board E1 or E2 Remote controller control board 1 Abnormal if data cannot be read nor mally from the nonvolatile memory of the remote controller control board Error ...

Page 23: ... of wire or connec tion failure of connector 3 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 1 Weak batteries of IR wireless remote controller 2 Contact failure of connector CNB on IR wireless remote controller board Insert failure 3 Contact failur...

Page 24: ... 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 IR wireless signal receiver board However if the indoor unit microprocessor 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 cooli...

Page 25: ...ture 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 disassemble corner panel with ...

Page 26: ...SE on indoor controller 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 f...

Page 27: ...C CNV Vane motor output MV 12V pulse output SWE Emergency operation Jumper wire J41 J42 Pair No setting for IR wireless remote controller FUSE 6 3A 250V CNMF Fan motor 1 4 DC 294 325V 5 4 DC15V 6 4 DC0 6 5V 7 4 Stop DC0 or 15V Operation DC7 5V 0 15V pulse VSP Voltage between pins of C626 DC0V FAN stop DC1 6 5V FAN operation Same as 6 4 of CNMF VFG Voltage between PC6722 and C955 Same as 7 4 of CNM...

Page 28: ...per wire is disco nnected There is no jumper JP1 because these models have the cond eva temperature thermistor TH5 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 BA4 Service PLA A12BA4 MODELS ON OFF 1 2 3 4 5 Service PLA A30BA4 MODELS ON OFF 1 2 3 4 5 PLA A18BA4 ON OFF 1 2 3 4 5 PLA A36BA4 ON OFF 1 ...

Page 29: ...ontroller 10 1 1 Operation 1 Rotation function and Back up function Outline of functions Operating the unit of main and sub alternately according to the interval setting Rotation function wThe 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 occurs to one unit the o...

Page 30: ...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 31: ... 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 the current setting ...

Page 32: ... 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 indoor controller board 4 Remo...

Page 33: ...o 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 Refer ...

Page 34: ...9 Drain pump Hose band Float switch Drain pump assembly fixing screw Drain pump fixing screw Float switch fixing screw 10 Removing the heat exchanger 1 Remove the 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...

Page 35: ...35 ...

Page 36: ... MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN CCopyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distributed in Nov 2010 No OCH482 Made in Japan New publication effective Nov 2010 Specifications subject to change without notice ...

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