Mitsubishi Electric PKA Series Service Manual Download

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SERVICE MANUAL

Notes:
• Added
PKA-M35HA-ER,
PKA-M50HA-ER,
PKA-M35HAL-ER, and
PKA-M50HAL-ER
in REVISED EDITION-A.

CONTENTS

1. REFERENCE MANUAL................................... 2

2. SAFETY PRECAUTION................................... 3

3. PARTS NAMES AND FUNCTIONS................. 8

4. SPECIFICATIONS........................................... 13

5. NOISE CRITERION CURVES......................... 14

6. OUTLINES AND DIMENSIONS...................... 15

7. WIRING DIAGRAM......................................... 16

8. REFRIGERANT SYSTEM DIAGRAM............ 18

9. TROUBLESHOOTING.................................... 19

10. FUNCTION SETTING.................................... 35

11. SPECIAL FUNCTION .....................................36

12. DISASSEMBLY PROCEDURE.......................38

Indoor unit
[Model Name] [Service Ref.]

PARTS CATALOG (OCB660)

INDOOR UNIT

PKA-M35HA

PKA-M35HA-ER

PKA-M50HA

PKA-M50HA-ER

PKA-M35HAL

PKA-M35HAL-ER

PKA-M50HAL

PKA-M50HAL-ER

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

No. OCH660

REVISED EDITION-A

November 2018

R32/R410A

OCH660 is void.

Summary of Contents for PKA Series

Page 1: ...STEM DIAGRAM 18 9 TROUBLESHOOTING 19 10 FUNCTION SETTING 35 11 SPECIAL FUNCTION 36 12 DISASSEMBLY PROCEDURE 38 Indoor unit Model Name Service Ref PARTS CATALOG OCB660 INDOOR UNIT PKA M35HA PKA M35HA PKA M35HA ER PKA M35HA ER PKA M50HA PKA M50HA PKA M50HA ER PKA M50HA ER PKA M35HAL PKA M35HAL PKA M35HAL ER PKA M35HAL ER PKA M50HAL PKA M50HAL PKA M50HAL ER PKA M50HAL ER SPLIT TYPE HEAT PUMP AIR COND...

Page 2: ...M140YKA OCH707 OCB707 PUHZ ZRP35 50VKA2 PUHZ ZRP71VHA2 PUHZ ZRP35 50VKA2 ER ET PUHZ ZRP71VHA2 ER ET OCH635 OCB635 PUHZ ZRP100VKA3 PUHZ ZRP140VKA3 PUHZ ZRP100YKA3 PUHZ ZRP140YKA3 PUHZ ZRP100VKA3 UK PUHZ ZRP140VKA3R1 UK PUHZ ZRP100YKA3R1 UK PUHZ ZRP140YKA3R2 UK OCH645 OCB645 PUHZ ZRP200YKA3 PUHZ ZRP200YKA3 OCH680 OCB680 PUHZ P200YKA3 PUHZ P200YKA3 UK OCH679 OCB679 PUHZ SHW112VHA PUHZ SHW112YHA PUHZ ...

Page 3: ...auge Gauge manifold Torque wrench Gas leak detector Charge hose Tools for R32 R410A Contamination inside refrigerant piping can cause deterio ration of refrigerant oil etc In case of reconnecting the refrigerant pipes after detaching make the flared part of pipe re fabricated Ventilate the room if refrigerant leaks during operation If refrigerant comes into contact with a flame poisonous gases wil...

Page 4: ...t pipes 12 When performing brazing work be sure to ventilate the room sufficiently Make sure that there are no hazardous or flammable materials nearby When performing the work in a closed room small room or similar location make sure that there are no refriger ant leaks before performing the work If refrigerant leaks and accumulates it may ignite or poisonous gases may be released 13 Do not instal...

Page 5: ...he Refrigeration Equipment Where electrical components are being changed they shall be fit for the purpose and to the correct specification At all times the manufacturer s maintenance and service guidelines shall be followed If in doubt consult the manufacturer s technical department for assistance The following checks shall be applied to installations using flammable refrigerants The charge size ...

Page 6: ...e conventional procedures shall be used However for flammable refrigerants it is important that best practice is followed since flammability is a considera tion The following procedure shall be adhered to remove refrigerant purge the circuit with inert gas evacuate purge again with inert gas open the circuit by cutting or brazing The refrigerant charge shall be recovered into the correct recovery ...

Page 7: ...to cylinders ensure that only appropriate refrig erant recovery cylinders are employed Ensure that the correct number of cylinders for holding the total system charge are available All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant i e special cylinders for the recovery of refrigerant Cylinders shall be complete with pressure relief valve and as...

Page 8: ...tting specifications UNF1 2 Use high tension side pressure of 5 3MPa G or over 2 Charge hose Use pressure performance of 5 09MPa G or over 3 Electronic weighing scale 4 Gas leak detector Use the detector for R32 or R410A 5 Adaptor for reverse flow check Attach on vacuum pump 6 Refrigerant charge base 7 Refrigerant cylinder Top of cylinder R32 or R410A refrigerant Cylinder with syphon 8 Refrigerant...

Page 9: ...splays 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 display display FAN SPEED display indicates which fan speed has been selected display The vertical direction of airflow is indicated display Blinks when model is selected display display CHECK and TEST RUN display indicate that the unit is being checked or test run dis...

Page 10: ...ll icons are displayed for explanation 5 6 1 2 3 4 Press to turn ON OFF the indoor unit 1 ON OFF button This lamp lights up in green while the unit is in operation It blinks while the remote controller is starting up or when there is an error Press to save the setting Main display Press to change the operation mode Main menu Press to move the cursor down Press to return to the previous screen Main...

Page 11: ... Weekly timer Restriction Maintenance Initial setting ON OFF timer Auto OFF timer Temp range Operation lock Manual vane angle Main Sub Timer Main display Contrast Display details Auto mode Administrator password Language selection Service Input maintenance info Function setting Check Self check Maintenance password Remote controller check Test run Clock Auto descending panel Menu structure Filter ...

Page 12: ...unctions cannot be operated Maintenance Auto descending panel Use to lift and lower the auto descending panel Optional parts Manual vane angle Use to set the vane angle for each vane to a fixed position 3D i see Sensor Use to set the following functions for 3D i see Sensor Air distribution Energy saving option Seasonal airflow Initial setting Main Sub When connecting 2 remote controllers one of th...

Page 13: ... O D mm inch 16 5 8 Dimensions W mm inch 898 35 3 8 D mm inch 249 9 13 16 H mm inch 295 11 5 8 Weight kg lbs 13 29 INDOOR UNIT Service Ref PKA M50HA PKA M50HA ER PKA M50HAL PKA M50HAL ER Mode Cooling Heating Power supply phase voltage cycle Single phase 230V 50Hz Input kW 0 04 0 03 Running current A 0 40 0 30 External finish Panel Munsell 1 0Y 9 2 0 2 Heat exchanger Plate fin coil Fan Fan drive No...

Page 14: ...0m 1 0m Measurement location Model Wall Main unit 5 1 SOUND LEVELS 5 2 NOISE CRITERION CURVES 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 55 0 60 0 65 0 70 0 63 125 250 500 1k 2k 4k 8k NC 60 NC 50 Octave band pressure level dB 0dB 20μPa Approximate minimum audible limit on continuous noise NC 40 Octave band center frequencies Hz NC 20 NC 30 High Low ...

Page 15: ...t rear piping C 8 B Size Refrigerant pipe 6 35 Flared connection 1 4F Refrigerant pipe 12 7 Flared connection 1 2F 16 O D 1 Liquid pipe 2 Gas pipe 3 Drain hose Knockout hole for right piping Right side Mount board 21 8 0 20 32 7 53 5 66 128 5 153 5 231 5 273 2 449 281 193 5 180 3 278 3 167 140 115 0 174 213 238 394 449 253 5 232 5 203 5 178 5 166 103 5 91 78 5 116 41 28 5 16 0 372 3 356 3 327 5 29...

Page 16: ...16 OCH660A WIRING DIAGRAM 7 PKA M35HA PKA M50HA PKA M35HA ER PKA M50HA ER ...

Page 17: ...17 OCH660A 17 PKA M35HAL PKA M50HAL PKA M35HAL ER PKA M50HAL ER ...

Page 18: ...istor 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 REFRIGERANT SYSTEM DIAGRAM 8 PKA M35HA PKA M50HA PKA M35HAL PKA M50HAL PKA M35HA ER PKA M50HA ER PKA M35HAL ER PKA M50HAL ER ...

Page 19: ...scertain the cause of the trouble according to 9 4 TROUBLESHOOTING OF PROBLEMS The trouble is not reoccurring Logged 1Consider the temporary defects such as the work of protection devices in the refrigerant circuit including compressor poor connection of wiring noise etc Re check the symptom and check the installation environment refrigerant amount weather when the trouble occurred matters related...

Page 20: ...nd refrigerant address 00 blinks Check that the remote controller s display has stopped before continuing 2 Press the TEMP buttons Select the 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 3 Point the remote controller at the sensor on the indoor unit an...

Page 21: ...nsor error 12 13 14 Others Other errors Refer to the technical manual for the outdoor unit Output pattern A Errors detected by indoor unit Wireless remote controller Wired remote controller Symptom Remarks Beeper sounds OPERATION INDICATOR lamp blinks Number of times Check code 1 P1 Intake sensor error 2 P2 Pipe TH2 sensor error P9 Pipe TH5 sensor error 3 E6 E7 Indoor outdoor unit communication er...

Page 22: ...e LED 2 blinks once Incorrect wiring between indoor and outdoor units incorrect polarity of S1 S2 S3 Remote controller wire short On the wireless remote controller with condition above following phenomena take place No signals from the remote controller can be received Operation lamp is blinking The buzzer makes a short ping sound Note Operation is not possible for about 30 seconds after cancellat...

Page 23: ...ard 1 3 Check resistance 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 TEST POINT DIAGRAM 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 h...

Page 24: ...ive 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 shields 4 Refer to 9 6 HOW TO CHECK THE PARTS 5 Check outdoor fan motor 67 Check operating condition of refrigeran...

Page 25: ...e remote controllers main if there is no problem with the action above 3 Check wiring of remote controller Total wiring length maximum 500 m Do not use cable with 3 or more cores The number of connecting indoor units maximum 16 units The number of connecting remote control ler maximum 2 units When it is not the above mentioned problem of 1 3 4 Diagnose remote controllers a When RC OK is displayed ...

Page 26: ...mit signals 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 The check code in the parenthesis indicates PAR 33MAA model Remote controller control board 1 Abnormal if data cannot be read nor mally from the nonvolatile memory of the remote controller contr...

Page 27: ...t switch 4 Contact failure of float switch connector 5 Dew condensation on float switch Drain water trickles down lead wire Drain water ripples due to filter clogging 6 Extension piping connection difference at twin triple or quadruple system 7 Miswiring of indoor outdoor connecting at twin triple or quadruple system 8 Room temperature thermistor liquid pipe temperature thermis tor detection is de...

Page 28: ...onnecting wire for miswiring When 220 240 V AC is detected check 4 below 4 Check the fuse on indoor controller board Check the wiring connection If no problem is found indoor controller board is defective 1 Check the voltage of indoor power supply terminal block L N When 220 240 V AC is not detected check the power supply wiring When 220 240 V AC is detected check 2 below 2 Check that there is no ...

Page 29: ...ailure 1 Check the connection of remote con troller wires in case of twin triple indoor unit system When 2 or more indoor units are wired in one refrigerant system connect remote controller wires to one of those units 2 Check the setting of refrigerant address in case of grouping control system If there are some units whose refrigerant addresses are 0 in one group set one of the units to 0 using S...

Page 30: ...r unit operates as follows 1 Indoor fan is running at high speed 2 Drain pump is working option 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 ...

Page 31: ...3 Fixed number of B 3480 2 Rt 15exp 3480 0 15 k 10 9 6 k 20 6 3 k 25 5 4 k 30 4 3 k 40 3 0 k Thermistor for lower temperature 1 273 t 1 273 9 6 1 Thermistor Parts name Check points Room temperature thermistor TH1 Pipe temperature thermistor liquid TH2 Condenser evaporator temperature thermistor TH5 Disconnect the connector then measure the resistance with a tester Refer to 9 6 1 Thermistor Vane mo...

Page 32: ...ing of SWE Set SWE to OFF if it is set to ON Is there contact failure Is the voltage normal Does the voltage repeat 0 V DC and 15 V DC Indoor controller board fuse check 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 1 VDC between 1 and 4 of the fan connector VDC 310 340 V D...

Page 33: ...ut 220 240 V AC option FUSE 3 15 A 250 V SWE Emergency operation connector CN105 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 3 220 240 V AC LED1 Power supply I B LED2 Power supply R B LED3 Transmission Indoor outdodr CN3C Transmission Indoor outdodr 0 24 V DC ...

Page 34: ...air 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 MODELS SETTING PKA M HA L MODELS SETTING PKA M35HA L PKA M50HA L ON OFF 1 2 3 4 5 ON OFF 1 2 3 4 5 ON OFF 1 2 3 4 5 Jumper wire Short Open The black square indicates a switch position 9...

Page 35: ...setting the unit number to 00 Refer to the service manual that comes with each outdoor unit 2 Functions available when setting the unit number to 01 03 or AL 07 in case of wireless remote controller Function Settings Mode No Setting No Initial setting Setting Filter sign 100 Hr 07 1 2500 Hr 2 No filter sign indicator 3 Fan speed Silent 08 1 Standard 2 High ceiling 3 Fan speed during the cooling th...

Page 36: ...function and Back up function Outline of functions Main and sub unit operate alternately according to the interval of rotation setting 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 an error occurs to one unit another unit will start operation Back up function System constraint This function is...

Page 37: ...on OFF Monitoring the request code of current setting Setting 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 functi...

Page 38: ...t and right side as shown in the figure 1 3 Push it up then pull down the lower side of 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 o...

Page 39: ...procedure 2 2 Remove the room temp thermistor TH1 see Photo 3 3 Remove the electrical 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...

Page 40: ... to the lower left Photo 9 Photo 10 7 Removing the vane motor 1 Remove the nozzle assembly Refer to procedure 5 2 Remove the screws of the vane motor unit and pull out the vane motor unit 3 Remove the screws of the vane motor unit cover 4 Remove the vane motor from the vane motor unit 5 Disconnect the connector from the vane motor 8 Removing the pipe temperature thermistor liquid TH2 and cond eva ...

Page 41: ...oom temperature thermistor 1 Remove the front panel Refer to procedure 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 ...

Page 42: ... 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN CCopyright 2017 MITSUBISHI ELECTRIC CORPORATION Issued Nov 2018 No OCH660 REVISED EDITION A Published Mar 2017 No OCH660 Made in Japan Specifications are subject to change without notice ...

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