Mitsubishi Electric CITY MULTI PKFY-WL18NKMU-E Technical & Service Manual
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Mitsubishi Electric CITY MULTI PKFY-WL18NKMU-E Technical & Service Manual

Split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
TECHNICAL & SERVICE MANUAL
Indoor unit
[Model Name]
PKFY-WL18NKMU-E
PKFY-WL24NKMU-E
PKFY-WL30NKMU-E
INDOOR UNIT
[Service Ref.]
PKFY-WL18NKMU-E.TH
PKFY-WL24NKMU-E.TH
PKFY-WL30NKMU-E.TH
CONTENTS
1. SAFETY PRECAUTION ······················ 2
3. SPECIFICATION ································ 4
4. NOISE CRITERION CURVES ··············· 6
5. OUTLINES AND DIMENSIONS ············ 7
6. WIRING DIAGRAM ···························· 9
8. MICROPROCESSOR CONTROL ········ 10
9. TROUBLESHOOTING ······················ 17
10. DISASSEMBLY PROCEDURE ··········· 24
11. REMOTE CONTROLLER ·················· 28
PARTS CATALOG (TCB121)
July 2023
No. TCH121

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Summary of Contents for Mitsubishi Electric CITY MULTI PKFY-WL18NKMU-E

  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS July 2023 No. TCH121 TECHNICAL & SERVICE MANUAL Indoor unit [Model Name] [Service Ref.] PKFY-WL18NKMU-E PKFY-WL18NKMU-E.TH PKFY-WL24NKMU-E PKFY-WL24NKMU-E.TH PKFY-WL30NKMU-E PKFY-WL30NKMU-E.TH CONTENTS 1. SAFETY PRECAUTION ······················ 2 2. PARTS NAMES AND FUNCTIONS ······· 3 3. SPECIFICATION ································ 4 4.

  • 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 Front Panel Air valve Emergency operation switch Louver Vane Remote control receiving section Air outlet 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-WL18NKMU-E.TH PKFY-WL24NKMU-E.TH PKFY-WL30NKMU-E.TH Power source 1-phase 208/230 V 60Hz Cooling capacity BTU/h 18,000 24,000 30,000 Power input 0.04 0.05 0.07 Current input 0.46 0.56 0.76 Heating capacity BTU/h 20,000 27,000 34,000 10.0 Power input 0.04 0.05 0.07 Current input 0.40...
  • Page 5 3-2. ELECTRICAL PARTS SPECIFICATIONS PKFY-WL18NKMU-E.TH Service Ref. PKFY-WL24NKMU-E.TH Symbol Parts name PKFY-WL30NKMU-E.TH Room temperature TH21 Resistance 30°F/15.8 k", 50°F/9.6 k", 70°F/6.0 k", 80°F/4.8 k", 90°F/3.9 k", 100°F/3.2 k" detection thermistor Pipe temperature TH22 Resistance 30°F/15.8 k", 50°F/9.6 k", 70°F/6.0 k", 80°F/4.8 k", 90°F/3.9 k", 100°F/3.2 k" detection thermistor/Inlet Pipe temperature TH23...

  • Page 6: Noise Criterion Curves

    NOISE CRITERION CURVES NOISE CRITERION CURVES PKFY-WL18NKMU-E.TH SPL(dB) PKFY-WL24NKMU-E.TH LINE SPL(dB) LINE High High NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 NC-20 NC-20 Approximate minimum Approximate minimum audible limit on audible limit on continuous noise continuous noise 1000 2000 4000...

  • Page 7: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: Inch(mm) TCH121...
  • Page 8 DETAILS OF WATER PIPE TCH121...

  • Page 9: Wiring Diagram

    WIRING DIAGRAM When attaching drain pump TB15 TO MA-REMOTE (option) When attaching drain CONTROLLER pump(option), remove DC8.7-13V FLOAT SW the jumper connector TO NEXT CN4F CN4F and fit the drain INDOOR float switch (FS). UNIT PULL TH21 TH22 TH23 TO OUTDOOR UNIT HBC/ HYDRO UNIT ME REMOTE FUSE(15A)

  • Page 10: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM Pipe temperature detection thermistor/ inlet TH22 Water inlet connection Unit: inch(mm) Water flow Model Manual air purge valve PKFY-WL18/24/30NKMU-E.TH Item Pipe temperature detection thermistor/ outlet Water inlet 7/8 (22) TH23 Water outlet Water outlet 7/8 (22) connection Water flow Heat exchanger Room temperature...
  • Page 11 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 12 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 13 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 14 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 15 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 16 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 17: Troubleshooting

    TROUBLESHOOTING 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 thermistor/inlet (TH22) Abnormal Normal Refer to “9-1-1. Thermistor”. Pipe temperature detection Open or short 4.3 to 9.6 kΩ...
  • Page 18 Parts name Checkpoints Pressure sensor ▪ Pressure sensor (inner water) PS1 (Optional parts) ▪ Pressure sensor (outlet water) PS2 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 19 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 20 9-2. FUNCTION OF DIP SWITCH Operation by switch Effective Switch Pole Function Remarks timing Thermistor<Room temperature> Built-in remote controller Indoor unit Address board position Filter clogging detection Provide Not provide <Initial setting> Filter cleaning sign 2,500 hr 100 hr 1 2 3 4 5 6 7 8 9 10 Fresh air intake Not effective Not effective...
  • Page 21 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> operation Setting (Standard) (Fan speed) It follows as the left table. PKFY-WL ** NKMU-E suspension (Silent)
  • Page 22 9-3. TEST POINT DIAGRAM 9-3-1. Indoor controller board (I.B) CN105 CN2M LED1 IT Terminal M-NET transmission connecting wire Vane motor (MV) Main power supply 24 − 30 VDC (non-polar) (Indoor unit : 220 − 240V) 12 VDC pulse output CN8A Linear expansion valve(LEV) 12 VDC pulse output (OPTION)
  • Page 23 9-3-2. PCB FOR WIRELESS REMOTE CONTROLLER (W.B) CN301 Connect to the indoor controller board (I.B) 9-3-3. SWITCH BOARD (S.B) SWE1 SWE2 Emergency operation (HEAT) Emergency operation (COOL) CN303 Connect to INDOOR CONTROLLER BOARD ( I.B ) CNRU 9-3-4. Address board (A.B) SW12 Address setting 10s digit Mode selection...

  • Page 24: Disassembly Procedure

    DISASSEMBLY PROCEDURE NOTE: Turn OFF the power supply before disassembly. : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. Be careful when removing heavy parts. OPERATION PROCEDURE PHOTOS/FIGURES 1. REMOVING THE PANEL Photo 1 Front grille Screws (1) Press and unlock the knobs on both sides of the front grille...
  • Page 25 OPERATION PROCEDURE PHOTOS/FIGURES 3. REMOVING THE ELECTRICAL BOX Photo 5 Fixture Connect for ground (1) Remove the panel and the corner box. (Refer procedure to 1) (2) Remove the screw and hook of address board case. (3) Remove the front and side electrical box covers (each 1 screw).
  • Page 26 OPERATION PROCEDURE PHOTOS/FIGURES 6. REMOVING THE INDOOR FAN MOTOR AND THE Photo 8 LINE FLOW FAN (1) Remove the panel and the corner box. (Refer to procedure 1) Lead wire of pipe thermistor (2) Remove the electrical box (Refer to procedure 2) and the nozzle assembly (Refer to procedure 4).
  • Page 27 OPERATION PROCEDURE PHOTOS/FIGURES 8. REMOVING THE HEAT EXCHANGER AND LEV 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 cut.

  • Page 28: 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 29 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 30 Menu structure Press the button. Main menu 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 31 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 32 Main menu list Main Setting and display items Setting details menu Operation Vane · Louver · Vent. Use to set the vane angle. • Select a desired vane setting from 5 different settings. (Lossnay) Use to turn ON/OFF the louver. •...
  • Page 33 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 34 <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 35 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 se- Error information rial number will appear. Error code The model name and serial number will appear only if the informa- Error unit...
  • Page 36 • 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 37 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 Service maintenance setting. 2. When the Service menu is selected, a window will appear asking for the pass- Service menu word.
  • Page 38 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 39 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 40 11-5. FUNCTION SETTING 11-5-1. PAR-41MAA Settings menu 1. Select ˝Service˝ from the Main menu, and press the [SELECT/HOLD] button. 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 41 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 42 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 43 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 44 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 45 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 46 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. TCH121 Made in Thailand Specifications are subject to change without notice.

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