Mitsubishi Electric PCA-A24KA4 Service Manual Download Page 2

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OUTDOOR UNIT’S SERVICE MANUAL

REFERENCE MANUAL

Model name

Service Ref.

Service Manual No.

PUZ-A18/24/30/36/42NHA4

OCH481

OCB481

PUZ-A18/24/30/36/42NHA4-BS

PUY-A18/24/30/36/42NHA4

PUY-A18/24/30/36/42NHA4-BS

Radio frequency interface

Wired remote controller

IR wireless remote controller

RF thermostat

Remote controller (Optional parts)

COOL

DRY

AUTO

FAN

HEAT

ON/OFF

TEMP.

Summary of Contents for PCA-A24KA4

Page 1: ...EM DIAGRAM 13 9 TROUBLESHOOTING 14 10 SPECIAL FUNCTION 28 11 DISASSEMBLY PROCEDURE 31 ON OFF TEMP COOL DRY AUTO FAN HEAT Indoor unit Model names Service Ref PCA A24KA4 PCA A24KA4 PCA A30KA4 PCA A30KA4 PCA A36KA4 PCA A36KA4 PCA A42KA4 PCA A42KA4 November 2010 NOTE This manual describes only service data of the indoor units RoHS compliant products have G mark on the spec name plate PARTS CATALOG OCB...

Page 2: ...NHA4 OCH481 OCB481 PUZ A18 24 30 36 42NHA4 BS PUZ A18 24 30 36 42NHA4 BS PUY A18 24 30 36 42NHA4 PUY A18 24 30 36 42NHA4 PUY A18 24 30 36 42NHA4 BS PUY A18 24 30 36 42NHA4 BS Radio frequency interface Wired remote controller IR wireless remote controller RF thermostat Remote controller Optional parts COOL DRY AUTO FAN HEAT ON OFF TEMP ...

Page 3: ...ed 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 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 If large a...

Page 4: ...er of syphon stood vertically Refrigerant is charged from liquid phase 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 of 5 09MPa G or over 3 Electronic scale 4 Gas leak detector Use the detector for R134a R407C or R410A 5 Adaptor for r...

Page 5: ...ature 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 Te...

Page 6: ...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 7: ...32 1 280 50 3 8 680 26 3 4 230 9 1 16 32 71 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 output Fan motor Airflow Low Medium2 Medium1 High External static pressure Operation control Thermostat Noise level Low Medium2 Medium1 High Field drain pi...

Page 8: ...3 680 26 3 4 230 9 1 16 38 84 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 output Fan motor Airflow Low Medium2 Medium1 High External static pressure Operation control Thermostat Noise level Low Medium2 Medium1 High Field drain pipe O D Dimensi...

Page 9: ... 0 0002 μbar NOTCH High Medium1 Medium2 Low SPL dB 41 39 37 35 LINE 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 μbar NOTCH High Medium1 Medium2 Low SPL dB 43 41 39 37 LINE 90 80 70 60 50 40 30 20 10 63 125 250 500 100...

Page 10: ... be clogged because of dust 8 Ceiling Electrical box 3 5 FRONT VIEW 11 16 18 4 3 4 121 Φ 4 1 5 1 6 Φ 1 2 5 7 1 2 190 3 76 4 7 8 124 18 1 8 461 1 13 16 46 6 9 3 16 233 2 NOTES 1 Use M10 or W3 8 screw for anchor bolt 2 Please be sure when installing the drain pump option parts refrigerant pipe will be only upward DEFROST STAND BY lamp Emergency operation switch Cooling Receiver Operation lamp Emerge...

Page 11: ...37 7 1 2 190 1 16 1 10 1 4 260 1 16 2 When electrical box is pulled down 2 15 16 75 2 1 1 2 38 7 4 3 3 8 85 3 3 8 86 15 1 4 387 2 Electrical box Air intake 59 3 4 1518 26 3 4 680 18 3 4 476 57 182 85 7 3 16 3 3 8 2 1 4 In case of wireless remote controller and i see sensor Optional Parts Emergency operation switch Heating Operation lamp Receiver Emergency operation switch Cooling DEFROST STAND BY ...

Page 12: ...L SELECTION See table 1 SWITCH CAPACITY CODE See table 2 CONNECTOR EMERGENCY OPERATION FAN MOTOR VANE MOTOR DRAIN PUMP DRAIN FLOAT SWITCH TERMINAL BLOCK INDOOR OUTDOOR CONNECTING LINE TERMINAL BLOCK REMOTE CONTROLLER TRANSMISSION LINE ROOM TEMP THERMISTOR 32 F 15kΩ 77 F 5 4kΩ DETECT PIPE TEMP THERMISTOR LIQUID 32 F 15kΩ 77 F 5 4kΩ DETECT COND EVA TEMP THERMISTOR 32 F 15kΩ 77 F 5 4kΩ DETECT MF FUSE...

Page 13: ...mperature thermistor TH5 Room temperature thermistor TH1 Refrigerant flow in cooling Refrigerant flow in heating Strainer 50 Strainer 50 Heat exchanger Refrigerant GAS pipe connection Flare Refrigerant LIQUID pipe connection Flare REFRIGERANT SYSTEM DIAGRAM 8 PCA A24KA4 PCA A30KA4 PCA A36KA4 PCA A42KA4 ...

Page 14: ...ooting 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 Reset error code ...

Page 15: ... 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 16: ...er of 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 CN4F open 5 P5 PA Drain pump error Forced compressor s...

Page 17: ...ected 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 followi...

Page 18: ...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 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 control...

Page 19: ...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 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 Check operatin...

Page 20: ...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 21: ...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 22: ...ctor 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 ...

Page 23: ...ote 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 controller 2 When you activate emergency operation of the...

Page 24: ...mperature of 68 F 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 68 F 86 F Abnormal Open or short Red Yellow Red Blue Red Orange Red White Connector Normal 250 Normal Turn on the indoor unit with the black plastic tape ...

Page 25: ... Do not pull out the connector CNMF for the motor with the power supply on It causes trouble of the indoor controller circuit board and fan motor Self check Symptom The indoor fan cannot turn around Yes NG Wiring contact check Contact of fan motor connector CNMF Power supply check Remove the connector CNMF Measure the voltage in the indoor controller circuit board TEST POINT VDC between 1 and 4 of...

Page 26: ...ump output DP 208 230V AC option 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 IR wireless remote controller FUSE 6 3A 250V CNMF Fan motor DC 294 325V DC15V VCC Voltage between pins of C955 15VDC Same as of CNMF CN44 Pipe temperature thermistor L...

Page 27: ...e table on the left in the table indicates the jumper line 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 For product Spare parts Indoor controller board type JP3 1 2 3 4 5 ON OFF Service board MODELS PCA A24KA4 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 ON OFF PCA A30KA4 ON OFF PCA A36KA4 PCA A42KA...

Page 28: ...on Outline 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 grou...

Page 29: ...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 contents ...

Page 30: ... the 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 button Example When the current setting is Setting No 2 Re...

Page 31: ...rical cover and remove the electrical cover 4 Remove 2 screws from the electrical box and pull the electrical box downward Temporarily secure the electrical box using 2 hooks in the back of electrical box 5 Disconnect the connectors on the indoor controller board Removing the electrical box 6 Disconnect the wires from the terminal blocks and pull out the electrical box See Photo 2 Removing the ind...

Page 32: ... 1 screw 4 8 PT See Photo 1 3 Remove 2 screws from the electrical cover and remove the electrical cover 4 Remove 2 screws from the electrical box and pull the electrical box downward 5 Temporarily secure the electrical box using 2 hooks in the back of electrical box 6 Remove the lower casing while pressing the 4 catches of the casing right side of the fan motor See Photo 6 7 Loosen the 2 set screw...

Page 33: ...cover 4 Remove 2 screws from the electrical box and pull the electrical box downward Temporarily secure the electrical box using 2 hooks in the back of electrical box 5 Remove 2 screws from the left side beam and remove the beam See Photo 9 6 Loosen 2 set screws 2 hexagon set screws of connect ing joint See Photo 5 7 Remove 3 lower casings while pressing each 4 catches of the casing See Photo 6 8 ...

Page 34: ...emove the right side panel See Figure 3 3 Remove the connector of vane motor 4 Remove 2 screws of vane motor cover then remove vane motor Photo 12 Screws Connector Vane motor and cover Photo 13 Under panel fixing screws 9 Removing the drain pan 1 Remove the air intake grille See Figure 1 2 2 Remove the side panel right and left See Figure 3 3 Remove the under panel See Photo 13 Remove the screws o...

Page 35: ...thermistor TH5 Pipe cover Pipe cover fixing screws Pipe cover fixing screws See Photo 15 Fastener Photo 18 Liquid pipe temperature thermistor TH2 12 Removing the Auto vane 1 Remove the intake grille See Figure 1 2 2 Remove the right side panel See Figure 3 3 Remove the vane motor and cover See Photo 12 4 Slide the auto vane to the vane motor side 5 Remove 2 axes from each vane support pushing the ...

Page 36: ...hoto 18 9 Remove the pipe thermistors TH2 and TH5 from each holder See Photo 19 10 Remove the pipe band fixing screw and remove the pipe band See Photo 22 11 Remove 2 screws from the heat exchanger and remove the heat exchanger Photo 22 Pipe band fixing screw Pipe band Heat exchanger fixing screws Heat exchanger Vane Photo 23 Heat exchanger CCopyright 2010 MITSUBISHI ELECTRIC ENGINEERING CO LTD Di...

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