Mitsubishi Electric PKFY Series Technical & Service Manual Download

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OCH715

LED1

Main power supply

(Indoor unit : 208/230

V AC)

CN44

Pipe temperature thermistor

: Liquid (TH22)

: Gas (TH23)

CN60

Linear expansion valve(LEV)

12 VDC pulse output

SW3

Function setting

SW22

Pair No. setting for wireless

remote controller

CN105

IT Terminal

CN32

Remote switch

CNV

Vane motor (MV1,MV2)

12 VDC pulse output

CN51

Centrally control

: Control signal

12 V DC pulse input (

: +)

: Operation indicator

12 V DC (

: +)

: Malfunction indicator

12 V DC (

: +)

CN52

Remote indicator

: Status lamp 12 V DC (

: +)

Fan motor output (SW1-5 OFF)

Thermostat ON (SW1-5 ON)

: Cooling/Dry status lamp

12 V DC (

: +)

: Heating status lamp

12 V DC (

: +)

LED2

Power supply for

MA-Remote controller

9-3. TEST POINT DIAGRAM

9-3-1. Indoor controller board

(I.B)

PKFY-P04NLMU-E.TH

PKFY-P06NLMU-E.TH

PKFY-P08NLMU-E.TH

PKFY-P12NLMU-E.TH

PKFY-P15NLMU-E.TH

PKFY-P18NLMU-E.TH

Note: The voltage range of 12 V DC in this page is between 11.5 to 13.7 V DC.

SW2

Capacity setting

CN2M

M-NET transmission connecting wire

24 − 30 VDC (non-polar)

CN4F

Drain float switch (FS) :

(OPTION)

CN2A

MA-Remote controller

connecting wire

: 8.7 − 13 VDC (non-polar)

CNRU

Connect to SWITCH BOARD

(S.B),LED BOARD (L.B)

and PCB FOR WIRELESS

REMOTE CONTRILLER (W.B)

CNP

Drain pump (DP) : (OPTION)

: 12 VDC

CND

Power supply for indoor

controller board

: 208/230V AC

Fuse

T3.15AL250V

CNAD

Connect to ADDRESS BOARD (A.B)

SWE

Test run (Drain pump and

indoor

fan motor)

CN20

Room temperature

thermistor (TH21)

CNMF

Connect to the Fan motor (MF)

: 294/325 VDC

: 15 VDC

: 0 VDC (FAN stop)

1 − 6.5 VDC (FAN operation)

CN24

External heater

Summary of Contents for PKFY Series

Page 1: ...OOTING 27 10 DISASSEMBLY PROCEDURE 35 Indoor unit Model Name Service Ref INDOOR UNIT R410A Model name indication PARTS CATALOG OCB715 No OCH715 March 2020 SPLIT TYPE HEAT PUMP AIR CONDITIONERS PKFY P04NLMU E PKFY P04NLMU E TH PKFY P06NLMU E PKFY P06NLMU E TH PKFY P08NLMU E PKFY P08NLMU E TH PKFY P12NLMU E PKFY P12NLMU E TH PKFY P15NLMU E PKFY P15NLMU E TH PKFY P18NLMU E PKFY P18NLMU E TH Note This...

Page 2: ...ure enters into refrigerant cycle that can cause deterioration of refrigerant oil or malfunction of com pressor If large amount of mineral oil enters that can cause deterio ration of refrigerant oil etc Do not use the existing refrigerant piping The old refrigerant and lubricant in the existing piping contains a large amount of chlorine which may cause the lubricant deterioration of the new unit U...

Page 3: ...er of syphon stood vertically Refrigerant is charged from liquid phase Electronic weighing scale Unit 3 Service tools Use the below service tools as exclusive tools for R410A refrigerant No Tool name Specifications 1 Gauge manifold Only for R410A Use the existing fitting specifications UNF1 2 Use high tension side pressure of 768 7 PSIG 5 3MPa G or over 2 Charge hose Only for R410A Use pressure pe...

Page 4: ...turn to the preset temperature Restriction Setting the temperature range restriction Function Operation lock function Weekly timer ON OFF timer High Power Manual vane angle Some functions may not be available depending on model types Wired remote controller function The functions which can be used are restricted according to each model Filter Air intake Vane Air outlet Louver Front Panel Remote co...

Page 5: ...d does not perform its function except for the ON OFF button 6 ON OFF lamp 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 7 Function button F1 Main display Press to change the operation mode Menu screen The button function varies with the screen 8 Function button F2 Main display Press to decrease temperatur...

Page 6: ... explanation Basic mode 4 Appears when the Weekly timer is enabled 5 Appears while the units are operated in the energy save mode Will not appear on some models of indoor units 6 Appears while the outdoor units are operated in the silent mode This indication is not available for CITY MULTI models 7 Appears when the built in thermistor on the remote controller is activated to monitor the room tempe...

Page 7: ...Manual vane angle ON OFF timer Auto return Clock Main Sub Temp range Auto OFF timer Schedule Daylight saving time Clock Administrator password Operation locked 3D i See sensor High power Vane Louver Vent Lossnay Comfort Timer Energy saving Basic setting Display setting Operation setting Restriction Weekly timer OU silent mode Timer menu Main display Display details Contrast Brightness Language sel...

Page 8: ...me input Function setting Error history Maintenance password Dealer information input Error information Test run menu Maintenance information Filter information Cleaning Settings menu Check menu Other menu Auto descending panel Descending operation Self check Descending adjustment Remote controller check Continue from the previous page Not all functions are available on all models of indoor units ...

Page 9: ...d when the ON OFF timer is enabled OU silent mode 1 Use to set the time periods in which priority is given to quiet operation of outdoor units over temperature control Set the Start Stop times for each day of the week Select the desired silent level from Normal Middle and Quiet Energy saving Restriction Temp range 2 Use to restrict the preset temperature range Different temperature ranges can be s...

Page 10: ...or information when an error occurs Check code error source refrigerant address unit model manufacturing number contact information dealer s phone number can be displayed The unit model manufacturing number and contact information need to be registered in advance to be displayed Filter information Use to check the filter status The filter sign can be reset Cleaning Auto descending panel Use to lif...

Page 11: ...erature buttons Weekly timer ON OFF button Set Time button Sets the time Airflow button Changes up down airflow direction Mode button Changes operation mode Timer ON button Timer OFF button OFF ON button Fan Speed button Changes fan speed SET SEND button CANCEL button Up Down buttons Menu button i see button Reset button Remote controller display Transmission area 3D i See sensor Air distribution ...

Page 12: ...asured in anechoic room dB A 22 24 26 28 22 26 29 31 22 27 31 35 Insulation material Polyethylene sheet Air filter PP Honeycomb Protection device Fuse Refrigerant control device LEV Connectable outdoor unit R410A CITY MULTI Diameter of refrigerant pipe Liquid in mm 1 4 6 35 Gas in mm 1 2 12 7 Field drain pipe size in mm I D 5 8 16 Standard attachment Installation Manual Instruction Book Optional p...

Page 13: ...fm 152 191 244 297 222 261 304 353 240 293 360 438 Noise level Low Mid2 Mid1 High measured in anechoic room dB A 24 31 37 41 29 34 37 40 31 36 41 46 Insulation material Polyethylene sheet Air filter PP Honeycomb Protection device Fuse Refrigerant control device LEV Connectable outdoor unit R410A CITY MULTI Diameter of refrigerant pipe Liquid in mm 1 4 6 35 Gas in mm 1 2 12 7 Field drain pipe size ...

Page 14: ...ed to 250V 20A M1 M2 S Rated to 250V 20A 1 2 Rated to 250V 10A Pipe temperature detection thermistor liquid Pipe temperature detection thermistor gas Room temperature detection thermistor Fuse Indoor controller board Fan motor with thermal fuse Vane motor Upper Linear expansion valve Power supply terminal block Transmission terminal block DC12V Stepping motor drive Port 3 32 P04 7 64 P06 08 12 15 ...

Page 15: ...se PKFY P06NLMU E NC 60 NC 50 NC 40 NC 20 NC 30 NC 70 BAND CENTER FREQUENCIES Hz OCTAVE BAND SOUND PRESSURE LEVEL dB 0dB 0 0002μbar 10 20 30 40 50 60 70 80 90 63 125 250 500 1000 2000 4000 8000 Approximate minimum audible limit on continuous noise PKFY P08NLMU E NC 60 NC 50 NC 40 NC 20 NC 30 NC 70 BAND CENTER FREQUENCIES Hz OCTAVE BAND SOUND PRESSURE LEVEL dB 0dB 0 0002μbar 10 20 30 40 50 60 70 80...

Page 16: ... 50 NC 40 NC 20 NC 30 NC 70 BAND CENTER FREQUENCIES Hz OCTAVE BAND SOUND PRESSURE LEVEL dB 0dB 0 0002μbar 10 20 30 40 50 60 70 80 90 63 125 250 500 1000 2000 4000 8000 Approximate minimum audible limit on continuous noise PKFY P18NLMU E NC 60 NC 50 NC 40 NC 20 NC 30 NC 70 BAND CENTER FREQUENCIES Hz OCTAVE BAND SOUND PRESSURE LEVEL dB 0dB 0 0002μbar ...

Page 17: ...GHT BACK PIPING WALL HOLE Ø2 61 34 Ø75 FOR LEFT BACK PIPING B C POWER SUPPLY TERMINAL BLOCK TRANSMISSION TERMINAL BLOCK MA REMOTE CONTROLLER TERMINAL BLOCK EMERGENCY OPERATION SWITCH HEAT UNDER PIPING CUT OUT AREA UNDER PIPING CUT OUT AREA REFRIGERANT PIPE DRAIN PIPE REFRIGERANT PIPE DRAIN PIPE EMERGENCY OPERATION SWITCH COOL RECEIVER B DETAILS OF CUT OUT FOR PIPING HOLE A D C AUTO VANES LOUVERS M...

Page 18: ...LLATION PLATE REQUIRED SPACE INDOOR UNIT AIR INLET AIR OUTLET INSTALLATION PLATE POWER SUPPLY TERMINAL BLOCK TRANSMISSION TERMINAL BLOCK MA REMOTE CONTROLLER TERMINAL BLOCK UNDER PIPING CUT OUT AREA UNDER PIPING CUT OUT AREA REFRIGERANT PIPE DRAIN PIPE REFRIGERANT PIPE DRAIN PIPE LEFT PIPING CUT OUT AREA REFRIGERANT PIPE DRAIN PIPE RIGHT PIPING CUT OUT AREA REFRIGERANT PIPE DRAIN PIPE RECEIVER OPE...

Page 19: ...ION MA REMOTE CONTROLLER TERMINAL BLOCK POWER SUPPLY SW2 SW3 SW22 SWE CAPACITY CODE MODE SELECTION PAIR NO SETTING FAN DRAIN PUMP TEST MODE SWITCH DRAIN PUMP DP MV1 VANE MOTOR UPPER L B LED BOARD LED1 LED2 NOTES 1 At servicing for outdoor unit always follow the wiring diagram of outdoor unit 2 In case of using MA Remote controller please connect to TB15 Remote controller wire is non polar 3 In cas...

Page 20: ... PKFY P08NLMU E TH PKFY P12NLMU E TH PKFY P15NLMU E TH PKFY P18NLMU E TH MICROPROCESSOR CONTROL 8 How to operate 1 Press POWER ON OFF button 2 Press the operation MODE button to display COOL 3 Press the TEMP button to set the set temperature NOTE The set temperature changes 1 F when the or button is pressed one time Cooling 67 to 87 F How to operate 1 Press ON OFF button 2 Press F1 button to displ...

Page 21: ...e other than COOLING 2 Fan By the remote controller setting switch of 4 speeds Auto Type Fan speed notch 4 speeds Auto type Auto When Auto is set fan speed is changed depending on the value of T Room temperature Set temperature 3 Drain pump 3 1 Drain pump control The drain pump will always run when the unit is in COOL or DRY mode Regardless of the thermo ON OFF Whenever the operation is changed ov...

Page 22: ...ture TH21 Dry thermo ON Room temperature Set temperature 2 F Dry thermo OFF Room temperature Set temperature Room temperature 3 minutes passed since starting operation Dry thermo ON time min Dry thermo OFF time min Thermostat signal Room temperature T1 Over 64 F ON T1 83 F 9 3 83 F T1 79 F 7 3 79 F T1 75 F 5 3 75 F T1 3 3 OFF Unconditional 3 10 Below 64 F Dry thermo OFF 1 2 Anti freeze control No ...

Page 23: ...e water when the float switch control judges the sensor is in the water 2 2 Float switch control Float switch control judges whether the sensor is in the air or in the water by turning the float switch ON OFF In the water Detected that the float switch is ON for 15 seconds In the air Detected that the float switch is OFF for 15 seconds Operates as it would in COOL operation 3 Vane up down vane cha...

Page 24: ...marks 1 Temperature adjustment function 1 1 Determining temperature adjustment function Function to prevent restarting for 3 minutes Room temperature Set temperature 2 F Thermo ON Room temperature Set temperature Thermo OFF 2 Fan By the remote controller setting switch of 4 speeds Auto Type Fan speed notch 4 speeds Auto type When Auto is set fan speed is changed depending on the value of T Set tem...

Page 25: ...tion changes to OFF the indoor fan operates in Extra low 2 4 Heat defrosting mode The indoor fan stops 3 Drain pump 3 1 Drain pump control The drain pump turns ON for the specified amount of time when any of the following conditions has been satisfied 1 ON for 3 minutes after the operation mode is switched from COOL or DRY to another operation mode FAN 2 ON for 6 minutes after the float switch is ...

Page 26: ...assed 2 COOL mode HEAT mode Room temperature Set temperature 3 F or 3 minutes have passed 3 COOL mode Operates as it would in COOL operation 4 HEAT mode Operates as it would in HEAT operation 8 6 WHEN UNIT IS STOPPED CONTROL MODE Control Mode Control Details Remarks 1 Drain pump 1 1 Drain pump control The drain pump turns ON for the specified amount of time when any of the following conditions has...

Page 27: ...han open Other than short State of moving part UP DOWN Normal Short Open Short Sky Blue Sky Blue Red Sky Blue 7 9 10 6 8 Connector CNV pin No M 1 2 3 4 5 6 LEV White Yellow Orange Blue Red Brown CN60 Sky Blue 10 10 10 10 Vane motor Lower MV2 Measure the resistance between the terminals with a tester At the ambient temperature 25 Normal 300 26 3 5 4 Red Sky Blue 5 3 Red Sky Blue 5 2 Red Sky Blue 5 ...

Page 28: ...oller board and the linear expansion valve Note Since the number of the connector at the controller board side and the relay connector are different follow the color of the lead wire 9 1 1 Thermistor 9 1 2 Linear expansion valve Thermistor characteristic graph Room temperature detection thermistor TH21 Pipe temperature detection thermistor liquid TH22 Pipe temperature detection thermistor gas TH23...

Page 29: ...lace the defective fan motor Is the voltage normal Is there contact failure No Yes Yes No Check the operation of fan Complete Fail OK OK Check the operation Is the fuse normal Yes Notes High voltage is applied to the connector CNMF for the fan motor Pay attention to the service Do not pull out the connecter CNMF for the motor with the power supply on It causes trouble of the indoor controller boar...

Page 30: ...closed completely and if there is any leaking detecting tempera ture of the thermistor will go lower If the detected temperature is much lower than the temperature indicated in the remote controller it means the valve is not closed all the way It is not necessary to exchange the linear expansion valve if the leakage is small and not affecting normal operation Thermistor Liquid pipe Linear expansio...

Page 31: ...ovided Not provided 3 Filter sign indication 2 500 hr 100 hr 4 Air intake 1 Not effective Not effective 5 Remote indication switching Thermo ON signal indication Fan output indication 6 Humidifier control Fan operation at Heating mode Thermo ON operation at heating mode 7 Air flow set in case of heat thermo OFF Low 2 Extra low 2 8 Setting air flow 1 Depends on SW1 7 9 Auto restart function Effecti...

Page 32: ...oller Setting for indoor unit Wireless remote controller pair number Setting operation Fig 1 A 1 Press the button 1 to stop the air conditioner 2 Press the button 2 3 Check that function No 1 is displayed and then press the button 3 The Screen display setting screen will be displayed Fig 2 Pair No changing operation Fig 2 B 1 Press the button 4 2 Each time the button 4 is pressed the pair No 0 3 c...

Page 33: ...r 9 3 TEST POINT DIAGRAM 9 3 1 Indoor controller board I B PKFY P04NLMU E TH PKFY P06NLMU E TH PKFY P08NLMU E TH PKFY P12NLMU E TH PKFY P15NLMU E TH PKFY P18NLMU E TH Note The voltage range of 12 V DC in this page is between 11 5 to 13 7 V DC SW2 Capacity setting CN2M M NET transmission connecting wire 24 30 VDC non polar CN4F Drain float switch FS OPTION CN2A MA Remote controller connecting wire ...

Page 34: ... setting 10s digit SW11 Address setting 1s digit SW14 BRANCH No SW1 Mode selection SWE1 Emergency operation HEAT SWE2 Emergency operation COOL REC1 Receiving unit LED1 Operating indicator GREEN LED2 Standby for Hearting ORANGE CN301 Connect to INDOOR CONTROLLER BOARD I B CNRU CN303 Connect to INDOOR CONTROLLER BOARD I B CNRU CN302 Connect to INDOOR CONTROLLER BOARD I B CNRU PCB FOR WIRELESS REMOTE...

Page 35: ...onnect the connectors below CNMF For fan motor CN44 For indoor piping 2 phase pipe and liquid pipe CN60 For LEV 4 Disconnect the connectors below CN2M For transmission CND For power supply CN2A For MA remote controller 5 Disconnect the connector for ground wire 6 Remove the screw on lower side of the electrical box See Photo 3 7 Push up the upper fixture catch to remove the box then remove it from...

Page 36: ...h VANE and VANE MOTOR AND DRAIN HOSE 1 Remove the panel and corner box Refer to procedure 1 2 Remove the electrical box covers Refer to procedure 2 3 Disconnect the vane motor connector CNV on the indoor controller board 4 Push fixture and pull out the drain hose from the nozzle assembly and remove nozzle assembly See Photo 6 Photo 4 Photo 5 Photo 6 5 REMOVING THE VANE MOTOR 1 Remove the nozzle as...

Page 37: ...nd pull out the line flow fan to the lower left When attaching the line flow fan screw the line flow fan so 4mm gap is provided between the right end of the line flow fan and the right wall of the air passage of the box Photo 9 Photo 8 7 REMOVING THE LIQUID PIPE THERMISTOR AND GAS PIPE THERMISTOR 1 Remove the panel and the corner box Refer to proce dure 1 2 Remove the electrical box covers Refer t...

Page 38: ...f the heat exchanger See Photo 10 8 Remove the heat exchanger with LEV 9 REMOVING THE ROOM TEMPERATURE THERMISTOR 1 Remove the panel and corner box Refer to procedure 1 2 Remove the electrical box covers Refer to procedure 2 3 Remove the room temperature thermistor 4 Disconnect the connector CN20 on the indoor controller board Photo 12 Photo 13 Indoor controller board Room temp thermistor TH21 Pho...

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