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Mitsubishi Electric PCA-A24KA, Service Manual

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24

9-6. HOW TO CHECK THE PARTS

PCA-A24KA PCA-A30KA  PCA-A36KA  PCA-A42KA

Parts name

Check points

Disconnect the connector then measure the resistance using a tester.
(At the ambient temperature 50

"

F~86

"

F)

(Refer to the next page for a detail.)

Room temperature
thermistor       (TH1)
Liquid pipe thermistor
                       (TH2)
Condenser/evaporator
temperature thermistor
                       (TH5)

Normal

4.3k

~9.6k

Abnormal

Open or short

Measure the resistance between the terminals using a tester.
(Winding temperature 68°F)

Measure the resistance between the terminals using a tester.

Drain pump (DP) (Option)

i-see sensor
(Option)

Drain float switch (FS)
(Option)

1

3

YLW

YLW

Normal

Abnormal

290

Open or short

State of moving part

Abnormal

DOWN

Other than open

UP

Normal

Open

Short

Other than short

Measure the resistance between the terminals using a tester.
(At the ambient temperature 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 using 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 on the outside of i-see sensor controller board.
i-see sensor rotates then pull out the connector of motor for i-see sensor.
With electricity being turned on, measure the power voltage between connectors with tester.

Abnormal

DC 1.857V~ 3.132V

Other than the normal

DC 0.939V~ 1.506V

(–)—

(+)

i-see sensor connector

i-see sensor (At the ambient temperature of 50°F~104°F)

NOTE

 : Be careful not to discharge static electricity into electronic device.

(+)—

(–)

Other than the normal

4 3 2 1

4 3

1

Blue BlackPink Brown

2

Black plastic tape

2

1

Moving part

4

3

Switch

Magnet

Moving
Part

Yellow

Blue

Red

Orange

White

Yellow

Blue

Red

Orange

White

Summary of Contents for PCA-A24KA

Page 1: ...UTLINES AND DIMENSIONS 9 7 WIRING DIAGRAM 11 8 REFRIGERANT SYSTEM DIAGRA 12 9 TROUBLESHOOTING 13 10 SPECIAL FUNCTION 28 11 DISASSEMBLY PROCEDURE 31 ON OFF TEMP Indoor unit Model names Service Ref PCA A24KA PCA A24KA PCA A30KA PCA A30KA PCA A36KA PCA A36KA PCA A42KA PCA A42KA March 2009 NOTE This manual describes only service data of the indoor units RoHS compliant products have G mark on the spec ...

Page 2: ...NHA3 BS OCS14 PUZ HA NHA2 OCS15 Model name Service Ref Service Manual No PUZ A18 24 30 36 42NHA3 PUZ A18 24 30 36 42NHA3 OCH OCB PUZ A18 24 30 36 42NHA3 BS PUZ A18 24 30 36 42NHA3 BS PUY A18 24 30 36 42NHA3 PUY A18 24 30 36 42NHA3 PUY A18 24 30 36 42NHA3 BS PUY A18 24 30 36 42NHA3 BS PUZ HA30 36NHA2 PUZ HA30 36NHA2 OCH426 OCB426 ...

Page 3: ...lowing tools are necessary to use R410A refrigerant Handle 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 Va...

Page 4: ...se 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 Indoor Unit PART NAMES AND FUNCTIONS 3 Air outlet Louver Vane Air intake Filter Inside of Air intake 2 Additional refrigerant charge When charging directly from cyli...

Page 5: ...mperature 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 Sectio...

Page 6: ... 41 26 1 1 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 Fie...

Page 7: ... 63 680 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 Dimen...

Page 8: ...dB 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 1...

Page 9: ...d 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 lift up mechanism option parts refrigerant pipe will be only upward DEFROST STAND BY lamp Emergency operation switch Cooling Receiver Operation lamp Eme...

Page 10: ... 16 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...

Page 11: ...R WIRELESS REMOTE CONTROLLER RECEIVING UNIT BUZZER LED OPERATION INDICATION GREEN LED PREPARATION FOR HEATING ORANGE EMERGENCY OPERATION HEAT DOWN EMERGENCY OPERATION COOL UP Notes FLOAT SW CN4F WHT When attaching drain lift up mechanism optional parts remove the jumper connector CN4F and fit the drain float switch FS When attaching drain lift up mechanism optional parts FS 1 4 1 4 1 6 I SEE SENSO...

Page 12: ...temperature 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 A24KA PCA A30KA PCA A36KA PCA A42KA ...

Page 13: ...oting 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 l...

Page 14: ...MOTE 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 refriger...

Page 15: ... 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 16: ...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 17: ...1 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 controll...

Page 18: ...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 19: ...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 20: ...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 21: ...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 22: ... 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 23: ...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 controller 2 When you activate emergency operation of the cooli...

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 using 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: ...supply I B LED3 Transmission Indoor outdoor CNP Drain pump 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 wireless remote controller FUSE 6 3A 250V CNMF Fan motor DC 294 325V DC15V VCC Voltage between pins of C955 15VD...

Page 27: ...ven in the 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 Marks in the table below 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 A24KA 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 ON OFF PCA A...

Page 28: ... 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 control system INDOOR UNIT ...

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: ...ews from the electrical 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 ...

Page 32: ... beam and remove the beam 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...

Page 33: ...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 Remove...

Page 34: ...ove 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 of ...

Page 35: ...hermistor TH5 Pipe cover Pipe cover fixing screws Pipe cover fix ing screws See Photo 15 Fastener Photo 19 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: ...o 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 2009 MITSUBISHI ELECTRIC ENGINEERING CO LTD Distr...

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