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Mitsubishi Electric PKFY-WL04NLMU-E.TH Technical & Service Manual

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Indoor unit
[Model Name]
PKFY-WL04NLMU-E
PKFY-WL06NLMU-E
PKFY-WL08NLMU-E
PKFY-WL12NLMU-E
PKFY-WL15NLMU-E
INDOOR UNIT
[Service Ref.]
PKFY-WL04NLMU-E.TH
PKFY-WL06NLMU-E.TH
PKFY-WL08NLMU-E.TH
PKFY-WL12NLMU-E.TH
PKFY-WL15NLMU-E.TH
Model name
indication
CONTENTS
1. SAFETY PRECAUTION ······················· 2
2. PARTS NAMES AND FUNCTIONS ········ 3
3. SPECIFICATION ································ 4
4. NOISE CRITERION CURVES ··············· 6
5. OUTLINES AND DIMENSIONS ············· 8
6. WIRING DIAGRAM ··························· 12
8. MICROPROCESSOR CONTROL ········· 13
9. TROUBLESHOOTING ······················· 20
10. DISASSEMBLY PROCEDURE ············ 27
11. REMOTE CONTROLLER ··················· 31
PARTS CATALOG (TCB122)
July 2023
No. TCH122

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Summary of Contents for Mitsubishi Electric PKFY-WL04NLMU-E.TH

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS July 2023 No. TCH122 TECHNICAL & SERVICE MANUAL Indoor unit [Model Name] [Service Ref.] PKFY-WL04NLMU-E.TH PKFY-WL04NLMU-E PKFY-WL06NLMU-E.TH PKFY-WL06NLMU-E PKFY-WL08NLMU-E.TH PKFY-WL08NLMU-E PKFY-WL12NLMU-E.TH PKFY-WL12NLMU-E PKFY-WL15NLMU-E.TH PKFY-WL15NLMU-E CONTENTS 1. SAFETY PRECAUTION ······················· 2 2. PARTS NAMES AND FUNCTIONS ········ 3 3.

  • Page 2: Safety Precaution

    Indicates a parts that requires grounding. ing the safety features for these devices, or the use of accessories other than the ones that are recommended by Mitsubishi Electric may result in smoke, Indicates that caution must be taken with rotating parts. (This fire, or explosion.

  • Page 3: Parts Names And Functions

    PARTS NAMES AND FUNCTIONS 2-1. Indoor unit Filter Air intake Emergency operation switch Front Panel Operation indicator lamp Vane Louver Air outlet Remote control receiving section 2-2. Wired Remote Controller <PAR-41MAA> Wired remote controller function The functions which can be used are restricted according to each model. : Supported : Unsupported PAR-41MAA...

  • Page 4: Specification

    SPECIFICATION 3-1. SPECIFICATIONS Model PKFY-WL04NLMU-E.TH PKFY-WL06NLMU-E.TH PKFY-WL08NLMU-E.TH PKFY-WL12NLMU-E.TH PKFY-WL15NLMU-E.TH Power source 1-phase 208/230 V 60Hz Cooling capacity BTU/h 4,000 6,000 8,000 12,000 15,000 Power input 0.02 0.03 0.04 0.05 Current input 0.20 0.25 0.35 0.45 Heating capacity BTU/h 4,500 6,700...
  • Page 5 3-2. ELECTRICAL PARTS SPECIFICATIONS PKFY-WL04NLMU-E.TH PKFY-WL12NLMU-E.TH Service Ref. Symbol PKFY-WL06NLMU-E.TH PKFY-WL15NLMU-E.TH Parts name PKFY-WL08NLMU-E.TH Room temperature TH21 Resistance 32°F/15 k", 50°F/9.6 k", 68°F/6.3 k", 77°F/5.4 k", 86°F/4.3 k", 104°F/3.0 k" detection thermistor Pipe temperature TH22 Resistance 32°F/15 k", 50°F/9.6 k", 68°F/6.3 k", 77°F/5.4 k", 86°F/4.3 k", 104°F/3.0 k"...

  • Page 6: Noise Criterion Curves

    NOISE CRITERION CURVES NOISE CRITERION CURVES PKFY-WL06NLMU-E.TH SPL(dB) LINE PKFY-WL04NLMU-E.TH SPL(dB) LINE High High Medium1 Medium1 Medium2 Medium2 NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 Approximate minimum Approximate minimum audible limit on NC-20 audible limit on NC-20...
  • Page 7 PKFY-WL15NLMU-E.TH SPL(dB) LINE High Medium1 Medium2 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz TCH122...

  • Page 8: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PKFY-WL04NLMU-E.TH PKFY-WL06NLMU-E.TH PKFY-WL08NLMU-E.TH Unit: inch(mm) TCH122...
  • Page 9 PKFY-WL04NLMU-E.TH PKFY-WL06NLMU-E.TH PKFY-WL08NLMU-E.TH Unit: inch(mm) TCH122...
  • Page 10 PKFY-WL12NLMU-E.TH PKFY-WL15NLMU-E.TH Unit: inch(mm) TCH122...
  • Page 11 PKFY-WL12NLMU-E.TH PKFY-WL15NLMU-E.TH Unit: inch(mm) TCH122...

  • Page 12: Wiring Diagram

    WIRING DIAGRAM PKFY-WL04NLMU-E.TH PKFY-WL06NLMU-E.TH PKFY-WL08NLMU-E.TH PKFY-WL12NLMU-E.TH PKFY-WL15NLMU-E.TH <Fig.*1> The black square(■) indicates When attaching drain When attaching drain pump pump(option), remove a switch position. TO NEXT (option) the jumper connector Models Models INDOOR CN4F and fit the drain FLOAT SW UNIT float switch (FS).

  • Page 13: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PKFY-WL04NLMU-E.TH PKFY-WL06NLMU-E.TH PKFY-WL08NLMU-E.TH PKFY-WL12NLMU-E.TH PKFY-WL15NLMU-E.TH Pipe temperature detection thermistor/ inlet TH22 Water inlet Unit: in (mm) connection Model Manual air purge valve PKFY-WL04/06/08/12/15NLMU-E Item Pipe temperature detection thermistor/ outlet Water inlet 7/8 (22) TH23 Water outlet Water outlet...
  • Page 14 Control Mode Control Details Remarks 1. Temperature 1-1. Determining temperature adjustment function • The ON/OFF commands by the indoor unit adjustment (Function to prevent restarting for 3 minutes) thermostatic control function • Room temperature Set temperature + 2°F ···Thermo-ON are not an ON/OFF •...
  • Page 15 8-2. DRYING OPERATION <How to operate> Press ON/OFF button. Press [F1] button to display DRYING. Press [F2] [F3] button to set the set temperature. RETURN SELECT MENU HOLD <How to operate> Press POWER ON/OFF button. Press the operation MODE button to display DRYING. Press the TEMP.
  • Page 16 8-3. FAN OPERATION <How to operate> Press ON/OFF button. Press [F1] button to display FAN. RETURN SELECT MENU HOLD <How to operate> Press POWER ON/OFF button. Press the operation MODE button to display FAN. Control Mode Control Details Remarks 1. Temperature Set by remote controller.
  • Page 17 8-4. HEAT OPERATION <How to operate> Press ON/OFF button. Press [F1] button to display HEAT. Press [F2] [F3] button to set the set temperature. NOTE: The settable temperature range varies with the model of outdoor units and remote controller. RETURN SELECT MENU HOLD <How to operate>...
  • Page 18 Control Mode Control Details Remarks 2-1. Hot adjust mode "Heat Standby" will be displayed during the The fan controller becomes the hot adjuster mode for the following conditions. hot adjust mode. When starting the HEAT operation When the temperature adjustment function changes from OFF to ON. The step change When release the HEAT defrosting operation of A to B will not be...
  • Page 19 8-5. AUTO OPERATION [AUTOMATIC COOL/HEAT CHANGE OVER OPERATION] <How to operate> Press ON/OFF button. Press [F1] button to display AUTO. Press [F2] [F3] button to set the set temperature. NOTE: The settable temperature range varies with the model of outdoor units and remote controller. RETURN SELECT MENU HOLD...

  • Page 20: Troubleshooting

    TROUBLESHOOTING 9-1. HOW TO CHECK THE PARTS PKFY-WL04NLMU-E.TH PKFY-WL06NLMU-E.TH PKFY-WL08NLMU-E.TH PKFY-WL12NLMU-E.TH PKFY-WL15NLMU-E.TH Parts name Checkpoints Room temperature Disconnect the connector then measure the resistance with a multimeter. detection thermistor (TH21) (At the ambient temperature 50 to 86 °F Pipe temperature detection...
  • Page 21 Parts name Checkpoints ▪ Pressure sensor (inner water) PS1 Pressure sensor ▪ Pressure sensor (outlet water) PS2 (Optional parts) 1. Check that the pressure sensor is connected. 2. Check the pressure sensor wiring for breakage. GND(Blue) GND(RED) Connector Vout(White) Vout(Brown) CNSB Pressure 0-1.0 MPa [145 psi] Vout 0.5-4.5 V Vcc(DC5V)(Yellow)
  • Page 22 2 FCV operation Close Open Fully open valve (85 pulses) Fully close valve (770 pulses) No. of pulses Valve opening degree 9-1-3. DC Fan motor (fan motor/indoor controller board) Check method of indoor fan motor (fan motor/indoor controller board) Notes ·...
  • Page 23 9-2. FUNCTION OF DIP SWITCH PKFY-WL04NLMU-E.TH PKFY-WL06NLMU-E.TH PKFY-WL08NLMU-E.TH PKFY-WL12NLMU-E.TH PKFY-WL15NLMU-E.TH The black square ( ) indicates a switch position. Operation by switch Effective Switch Pole Function Remarks timing Thermistor Built-in remote <Intake temperature Indoor unit Address board controller detection> position <Initial setting>...
  • Page 24 The black square ( ) indicates a switch position. Effective Switch Pole Function Remarks timing Fan speed can be changed depending on SWA Address board setting. (High ceiling) Under <Initial setting> Setting operation (Standard) It follows as the left table. (Fan speed) PKFY-WL ** NLMU-E suspension...
  • Page 25 9-3. TEST POINT DIAGRAM 9-3-1. Indoor controller board (I.B) PKFY-WL04NLMU-E.TH PKFY-WL06NLMU-E.TH PKFY-WL08NLMU-E.TH PKFY-WL12NLMU-E.TH PKFY-WL15NLMU-E.TH CN105 CN2M LED1 IT Terminal M-NET transmission connecting wire Vane motor (MV) Main power supply 24 − 30 VDC (non-polar) (Indoor unit : 208 − 230V)
  • Page 26 9-3-2. PCB FOR WIRELESS REMOTE CONTROLLER (W.B), SWITCH BOARD (S.B) and LED BOARD (L.B) PKFY-WL04NLMU-E.TH PKFY-WL06NLMU-E.TH PKFY-WL08NLMU-E.TH PKFY-WL12NLMU-E.TH PKFY-WL15NLMU-E.TH PCB FOR WIRELESS SWITCH BOARD (S.B) LED BOARD (L.B) REMOTE CONTROLLER (W.B) SWE1 Emergency operation (HEAT) SWE2 CN302 REC1 Emergency operation (COOL)

  • Page 27: Disassembly Procedure

    DISASSEMBLY PROCEDURE PKFY-WL04NLMU-E.TH PKFY-WL06NLMU-E.TH PKFY-WL08NLMU-E.TH PKFY-WL12NLMU-E.TH PKFY-WL15NLMU-E.TH Be careful when removing heavy parts. NOTE: Turn OFF the power supply before assembly. OPERATION PROCEDURE PHOTOS/FIGURES 1. REMOVING THE PANEL Photo 1 (1) Insert the screwdriver to the hole at VANE LOWER shaft...
  • Page 28 OPERATION PROCEDURE PHOTOS/FIGURES 3. REMOVING THE ADDRESS BOARD, THE INDOOR Photo 4 CONTROLLER BOARD, THE WIRELESS Holder of wireless remote CONTROLLER BOARD, LED BOARD Switch board holder controller board and LED board (Holder of switch board) (1) Remove the panel and the corner box. (Refer to procedure 1) (2) Remove the front and side electrical box covers (each 2 Address board...
  • Page 29 OPERATION PROCEDURE PHOTOS/FIGURES 6. REMOVING THE INDOOR FAN MOTOR AND THE Photo 8 LINE FLOW FAN Lead wire of pipe thermistor (1) Remove the panel and the corner box. (Refer to procedure 1) Motor band (2) Remove the electrical box (Refer to procedure 2) and the nozzle assembly (Refer to procedure 4).
  • Page 30 OPERATION PROCEDURE PHOTOS/FIGURES 8. REMOVING THE HEAT EXCHANGER Photo 12 (1) Remove the panel and the corner box (Refer to procedure 1). Heat exchanger (2) Remove the electrical box (Refer to procedure 3) and the nozzle assembly (Refer to procedure 4). (3) Remove the water cover.

  • Page 31: Remote Controller

    REMOTE CONTROLLER 11-1. REMOTE CONTROLLER FUNCTIONS <PAR-41MAA> Controller interface The functions of the function buttons change depending on the screen. Refer to the button function guide that appears at the bottom of the LCD for the functions they serve on a given screen. When the system is centrally controlled, the button function guide that corresponds to the locked button will not appear.
  • Page 32 Display The main display can be displayed in two different modes: “Full” and “Basic”. The initial setting is “Full”. To switch to the “Basic” mode, change the setting on the Main display setting. (Refer to operation manual included with remote controller.) <Full mode>...
  • Page 33 Menu structure Press the button. MENU Main menu Move the cursor to the desired item with the buttons, and press the SELECT/HOLD button. Operation Vane · Louver · Vent. (Lossnay) High power Comfort Manual vane angle 3D i-See sensor Timer menu Timer ON/OFF timer Auto-OFF timer...
  • Page 34 Continue from the previous page. Maintenance menu Error information Filter information Cleaning Auto descending panel Descending operation Descending adjustment Service menu Test run menu Test run Drain pump test run Maintenance information Model name input Serial No. input Dealer information input Initialize maintenance info.
  • Page 35 Main menu list Main Setting and display items Setting details menu Operation Vane · Louver · Vent. Use to set the vane angle. (Lossnay) • Select a desired vane setting from 5 different settings. Use to turn ON/OFF the louver. •...
  • Page 36 Main Setting and display items Setting details menu Initial Basic Main/Sub When connecting 2 remote controllers, one of them needs to be designated as setting setting a sub controller. Clock Use to set the current time.　 Daylight Set the daylight saving time. saving time Administrator The administrator password is required to make the settings for the following...
  • Page 37 <PAR-SL101A-E> Controller interface Transmission area Remote controller display Set Temperature buttons OFF/ON button Mode button (Changes operation mode) Fan Speed button (Changes fan speed) Airflow button (Changes up/ down airflow direction) i-see button* Timer ON button Menu button Timer OFF button SET/SEND button Weekly timer ON/OFF button* CANCEL button...
  • Page 38 11-2. ERROR INFORMATION When an error occurs, the following screen will appear. Check the error status, stop the operation, and consult your dealer. 1. Check code, error unit, refrigerant address, model name, and serial Error information number will appear. Error code The model name and serial number will appear only if the informa- Error unit Unit#1...
  • Page 39 • Checking the error information Maintenance menu While no errors are occurring, page 2/2 of the error information can be Error information viewed by selecting "Error information" from the Maintenance menu. Filter information Errors cannot be reset from this screen. Cleaning Main menu: RETURN Cursor...
  • Page 40 11-3. SERVICE MENU Maintenance password is required 1. Select "Service" from the Main menu, and press the [SELECT/HOLD] button. Main Main menu *At the main display, the menu button and select "Service" to make the maintenance setting. Service 2. When the Service menu is selected, a window will appear asking for the pass- Service menu word.
  • Page 41 11-4. TEST RUN 11-4-1. PAR-41MAA 1. Select "Service" from the Main menu, and press the [SELECT/HOLD] button. Test run Input maintenance info. Settings Check Select "Test run" with the F1 or F2 button, and press the [SELECT/HOLD] button. Others : RETURN SELECT MENU RETURN...
  • Page 42 11-4-2. PAR-SL101A-E 1. Press the button to stop the air conditioner. • If the weekly timer is enabled ( is on), press the button to disable it ( is off). 2. Press the button for 5 seconds. • comes on and the unit enters the service mode. 3.
  • Page 43 11-5. FUNCTION SETTING 11-5-1. PAR-41MAA 1. Select ˝Service˝ from the Main menu, and press the [SELECT/HOLD] button. Settings menu Function setting Lossnay Select ˝Setting˝ from the Service menu, and press the [SELECT/HOLD] button. Service menu: MENU Cursor Select ˝Function setting˝, and press the [SELECT/HOLD] button. SELECT MENU RETURN...
  • Page 44 11-5-2. PAR-SL101A-E 1. Going to the function select mode Press the button between of 5 seconds. (Start this operation from the status of remote controller display turned off.) [CHECK] is lit and "00" blinks. (Fig. 1) Press the button to set the "50". Direct the wireless remote controller toward the receiver of the indoor unit and press the button.
  • Page 45 11-6. ERROR HISTORY 1. Select ˝Service˝ from the Main menu, and press the [SELECT/HOLD] button. Test run Input maintenance info. Settings Check Others RETURN Select ˝Check˝ with the F1 or F2 button, and press the [SELECT/HOLD] button. SELECT MENU RETURN HOLD 2.
  • Page 46 11-7. SELF-DIAGNOSIS 11-7-1. PAR-41MAA 1. Select ˝Service˝ from the Main menu, and press the [SELECT/HOLD] button. Diagnosis Self check Select ˝Check˝ from the Service menu, Remote controller check and press the [SELECT/HOLD] button. Service menu: MENU Select ˝Diagnosis˝ from the Check menu, Cursor and press the [SELECT/HOLD] button.
  • Page 47 11-7-2. PAR-SL101A-E button 1 to stop the air conditioner. 1. Press the button 3 is on), press the is off). to disable it ( button 2 for 5 seconds. 2. Press the button 5 to select the refrigerant address (M-NET address) B 3.
  • Page 48 11-8. REMOTE CONTROLLER CHECK If operations cannot be completed with the remote controller, diagnose the remote controller with this function. 1. Select "Service" from the Main menu, and Diagnosis press the [SELECT/HOLD] button. Self check Remote controller check Select "Check" from the Service menu, and press the [SELECT/HOLD] button.
  • Page 50 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU TOKYO 100-8310, JAPAN MITSUBISHI ELECTRIC CONSUMER PRODUCTS (THAILAND) CO., LTD. 700/406 MOO 7, TAMBON DON HUA ROH, AMPHUR MUANG, CHONBURI 20000 THAILAND Published: Jul. 2023. No. TCH122 Made in Thailand Specifications are subject to change without notice.

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