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Mitsubishi Electric PLFY Series 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 names]
PLFY-WL06NEMU-E
PLFY-WL08NEMU-E
PLFY-WL12NEMU-E
PLFY-WL15NEMU-E
PLFY-WL18NEMU-E
PLFY-WL24NEMU-E
PLFY-WL30NEMU-E
PLFY-WL36NEMU-E
PLFY-WL48NEMU-E
Grille model
[Model name]
PLP-41EAEU
Model name
indication for
MAIN UNIT
INDOOR UNIT
[Service Ref.]
PLFY-WL06NEMU-E.TH
PLFY-WL08NEMU-E.TH
PLFY-WL12NEMU-E.TH
PLFY-WL15NEMU-E.TH
PLFY-WL18NEMU-E.TH
PLFY-WL24NEMU-E.TH
PLFY-WL30NEMU-E.TH
PLFY-WL36NEMU-E.TH
PLFY-WL48NEMU-E.TH
Model name
indication for GRILLE
REVISED EDITION-A
Revision:
• Some descriptions have been
revised in REVISED EDITION-A.
TCH124 is void.
CONTENTS
1. SAFETY PRECAUTION .......................... 2
3. SPECIFICATIONS ................................... 4
4. 4-WAY AIRFLOW SYSTEM .................. 10
6. WIRING DIAGRAM ............................... 14
9. TROUBLESHOOTING .......................... 22
10. DISASSEMBLY PROCEDURE ............. 29
11. REMOTE CONTROLLER ...................... 36
PARTS CATALOG (TCB124)
August 2023
No. TCH124

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  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS August 2023 No. TCH124 REVISED EDITION-A TECHNICAL & SERVICE MANUAL Indoor unit [Model names] [Service Ref.] PLFY-WL06NEMU-E PLFY-WL06NEMU-E.TH Revision: • Some descriptions have been PLFY-WL08NEMU-E PLFY-WL08NEMU-E.TH revised in REVISED EDITION-A. TCH124 is void. PLFY-WL12NEMU-E PLFY-WL12NEMU-E.TH PLFY-WL15NEMU-E PLFY-WL15NEMU-E.TH PLFY-WL18NEMU-E...

  • 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 Drain pipe Air outlet Filter Outlet pipe Inlet pipe Signal receiver (Option) i-see Sensor (Option) Model name indication Model name indication for GRILLE for MAIN UNIT Vane Air intake (Intake grille) 2-2. WIRED REMOTE CONTROLLER <PAR-41MAA> <PAC-YT53CRA> The functions which can be used are restricted according to each model.

  • Page 4: Specifications

    SPECIFICATIONS 3-1. SPECIFICATIONS Model PLFY-WL06NEMU-E.TH PLFY-WL08NEMU-E.TH PLFY-WL12NEMU-E.TH PLFY-WL15NEMU-E.TH PLFY-WL18NEMU-E.TH Power source 1-phase 208/230 V 60Hz Cooling capacity BTU/h 6,000 8,000 12,000 15,000 18,000 (Nominal) Power input 0.03 0.04 Current input 0.26 0.29 0.33 0.35 0.40 Heating capacity BTU/h 6,700 9,000 13,500 17,000 20,000...
  • Page 5 Model PLFY-WL24NEMU-E.TH PLFY-WL30NEMU-E.TH PLFY-WL36NEMU-E.TH PLFY-WL48NEMU-E.TH Power source 1-phase 208/230 V 60Hz Cooling capacity BTU/h 24,000 30,000 36,000 48,000 (Nominal) 10.6 14.1 Power input 0.04 0.05 0.08 0.11 Current input 0.40 0.46 0.66 1.05 Heating capacity BTU/h 27,000 34,000 40,000 54,000 (Nominal) 10.0 11.7...
  • Page 6 3-2. ELECTRICAL PARTS SPECIFICATIONS PLFY-WL06NEMU-E.TH PLFY-WL08NEMU-E.TH PLFY-WL24NEMU-E.TH PLFY-WL30NEMU-E.TH Service Ref. PLFY-WL12NEMU-E.TH PLFY-WL15NEMU-E.TH PLFY-WL36NEMU-E.TH PLFY-WL48NEMU-E.TH Symbol Parts name PLFY-WL18NEMU-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" thermistor Inlet pipe thermistor 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" Outlet pipe thermistor TH23 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"...
  • Page 7 3-4. NC CURVES PLFY-WL06NEMU-E.TH SPL(dB) LINE PLFY-WL08NEMU-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 NC-20 Approximate minimum audible limit on NC-20 audible limit on continuous noise continuous noise 1000 2000 4000...
  • Page 8 PLFY-WL18NEMU-E.TH SPL(dB) LINE PLFY-WL24NEMU-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 NC-20 audible limit on audible limit on continuous noise NC-20 continuous noise 1000 2000 4000 8000 1000...
  • Page 9 PLFY-WL48NEMU-E.TH SPL(dB) LINE High Medium1 Medium2 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum NC-20 audible limit on continuous noise 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz TCH124A...

  • Page 10: Way Airflow System

    4-WAY AIRFLOW SYSTEM 4-1. PLACEMENT OF THE AIR OUTLETS • For this grille, the blowout direction comes in 11 patterns. Also, by setting switch on the controller board to the appropriate settings, you can adjust the airflow and speed. Select the settings from Table1 according to the location in which you want to install the unit.
  • Page 11 4-2. BRANCH DUCT HOLE AND FRESH AIR INTAKE HOLE At the time of installation, use the duct holes (cut out) located at the positions shown in following diagram, as and when required. • A fresh air intake hole for the optional multi-functional casement can also be made. Note: The figures marked with * in the drawing below represent the dimensions of the main unit excluding those of the optional multi-functional casement.
  • Page 12 4-4. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS PLFY-WL06/08/12/15/18/24/30/36/48NEMU-E Taking air into the unit Multi-functional casement + Standard filter 50(20) 50(20) 2 - inlet -50(-20) -50(-20) -100(-40) 1 - inlet -100(-40) -150(-60) -200(-80) -150(-60) [CMM] [CMM] [CFM] [CFM] Airflow rate Airflow rate Multi-functional casement + High efficiency filter How to read curves...

  • Page 13: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: inch (mm) TCH124A...

  • Page 14: Wiring Diagram

    WIRING DIAGRAM TCH124A...

  • Page 15: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM Pipe temperature detection thermistor/ inlet TH22 Water inlet connection Water flow Manual air purge valve Pipe temperature detection thermistor/ outlet TH23 Water outlet connection Water flow Heat exchanger Room temperature detection thermistor TH21 WATER PIPE CONNECTION SIZE Unit: inch (mm) Model name PLFY-WL06/08/12/15/18NEMU-E...
  • Page 16 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 17 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 18 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 19 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 20 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 21 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 22: Troubleshooting

    TROUBLESHOOTING 9-1. HOW TO CHECK THE PARTS Parts name Checkpoints Room temperature Disconnect the connectors, then measure the resistance with a multimeter. detection thermistor (TH21) (At ambient temperatures of 50°F ~ 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 23 Parts name Checkpoints i-see Sensor Turn the power ON while the i-see Sensor connector is connected to the CN4Z on indoor controller board. A communication between the indoor controller board and i-see Sensor board is made to detect the connection. Normal: When the operation starts, the motor for i-see Sensor is driven to rotate the i-see Sensor.
  • Page 24 9-1-2. Flow control valve 1) Summary of flow control valve (FCV) operation The FCV is operated by a stepping motor, which operates by receiving a pulse signal from the indoor control board. The FCV position changes in response to the pulse signal. Indoor control board and FCV connection Flow control valve Control board...
  • Page 25 Pressure sensor (inner water) PS1 Pressure sensor (outlet water) PS2 1) Check that the pressure sensor is connected. 2) Check the pressure sensor wiring for breakage. 9-1-3. Drain pump Drain pump Purple Black 1. Check if the drain float switch works properly. 2.
  • Page 26 9-2. FUNCTION OF DIP SWITCH The black square (■) indicates a switch position. Operation by switch Effective Switch Pole Function Remarks timing Thermistor Built-in remote <Room temperature detection> Indoor unit controller position Indoor controller board Filter clogging detection Provided Not provided <Initial setting>...
  • Page 27 Operation by switch Effective Switch Pole Function Remarks timing SW11 Indoor controller board 1s digit Address setting <Initial setting> address should be done setting when M-NET SW12 remote controller is 10s digit being used. Before address setting power supply This is the switch Indoor controller board to be used when <Initial setting>...
  • Page 28 9-3. TEST POINT DIAGRAM Indoor controller board TB15 MA-Remote controller connecting wire Vane motor output 1–2: 8.7–13 VDC (non-polar) 12 VDC pulse SW21 Number of air outlets and height of M-NET transmission connecting wire the ceiling 24–30 VDC (non-polar) SW14 LED2 Branch No.

  • Page 29: Disassembly Procedure

    DISASSEMBLY PROCEDURE : Indicates the visible parts in the photos/figures. : Indicates the invisible parts in the photos/figures. Be careful when removing heavy parts. OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the filter Figure 1 Knob Air intake grille (1) Slide the knob of air intake grille toward the arrow to open the air intake grille.
  • Page 30 OPERATING PROCEDURE PHOTOS/FIGURES 4. Removing the room temperature thermistor (TH21) Photo 3 (1) Remove the electrical box cover. (See Photo 1 and 2) Room temperature (2) Disconnect the connector CN20 (Red) from the indoor detection thermistor controller board. Indoor controller board (3) Remove the room temperature thermistor with its holder.
  • Page 31 Be careful when removing heavy parts. OPERATING PROCEDURE PHOTOS/FIGURES Bell mouth fixing screws 6. Removing the electrical box Photo 6 (1) Remove the electrical box cover (See Photo 1 and 2) and the connectors (Refer to procedure 5). (2) Remove the electrical box fixing screws (M5×10: 2 Bell mouth screw).
  • Page 32 OPERATING PROCEDURE PHOTOS/FIGURES 8. Removing the fan motor (MF) Photo 10 (1) Remove the turbo fan. (See Photo 8 and refer to Nuts and washers procedure 7) Rubber mounts (2) Remove the lead cover (tapping screw 4×10: 2 screws). (See Photo 10) (3) Loosen the 2 clamps.
  • Page 33 OPERATING PROCEDURE PHOTOS/FIGURES 10. Removing the drain pan Photo 13 (1) Remove the electrical box. (See photo 3 and refer to procedure 6) Drain pan (2) Remove the bell mouth (tapping screw 4×10 : 2 screws). (See Photo 6) (3) Remove the drain pan (screw M5×10: 4 screws). Drain pan Drain pan fixing screws...
  • Page 34 OPERATING PROCEDURE PHOTOS/FIGURES 12. Removing the drain pump (DP) Photo 15 (1) Remove the drain pan. (Refer to procedure 10) Float switch (2) Cut the hose band and remove the hose. Drain pump (3) Loosen the clamp of the drain pump. (4) Remove the drain pump (tapping screw 4×10: 2 screws/2 hooks).
  • Page 35 OPERATING PROCEDURE PHOTOS/FIGURES 13. Removing the float switch (FS) Photo 16 (1) Remove the drain pan. (Refer to procedure 10) Do not hold this floating part (2) Loosen the clamp of the drain pump. (See Photo 15) when lifting; Doing so will cause malfunction.

  • Page 36: 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 37 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 38 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 39 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 40 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 41 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 42 <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 43 <PAC-YT53CRAU> Note: The phrase "Wired remote controller" in this manual refers only to the PAC-YT53CRAU. If you need any information for the other remote controller, please refer to either the installation manual or initial setting manual which are included in remote controller's box.
  • Page 44 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 45 • 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 46 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 47 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 48 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 49 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 50 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. 11-1) button to set the ˝50˝. Press the Direct the wireless remote controller toward the receiver of the indoor unit and press the...
  • Page 51 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 52 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 53 11-7-2. PAR-SL101A-E button 1 to stop the air conditioner. 1. Press the is on), press the button 3 to disable it ( is off). button 2 for 5 seconds. 2. Press the button 5 to select the refrigerant address (M-NET address) B 3.
  • Page 54 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 56 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 Issued: Aug. 2023. No. TCH124 REVISED EDITION-A Published: Jul. 2023. No. TCH124 Made in Thailand Specifications are subject to change without notice.

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