Mitsubishi Electric PCFY Series Service Manual

Split-type, heat pump air conditioners

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

SERVICE MANUAL

Series PCFY

Indoor unit

[Model names]

[Service Ref.]

PCFY-L15NKMU-A

PCFY-L24NKMU-A

PCFY-L30NKMU-A

PCFY-L36NKMU-A

INDOOR UNIT

R454B

CONTENTS

1. SAFETY PRECAUTION .......................... 2

2. PART NAMES AND FUNCTIONS .......... 7

3. SPECIFICATION ..................................... 8

4. OUTLINES AND DIMENSIONS ............ 12

5. WIRING DIAGRAM ............................... 15

6. REFRIGERANT SYSTEM DIAGRAM ........ 16

7. MICROPROCESSOR CONTROL ............... 17

8. TROUBLESHOOTING .......................... 24

9. DISASSEMBLY PROCEDURE ............. 35

10. REMOTE CONTROLLER ..................... 41

PARTS CATALOG (OCB865)

Model name

indication

July 2024

No. OCH865

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Summary of Contents for Mitsubishi Electric PCFY Series

Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS July 2024 No. OCH865 SERVICE MANUAL Series PCFY R454B Indoor unit [Model names] [Service Ref.] PCFY-L15NKMU-A PCFY-L15NKMU-A PCFY-L24NKMU-A PCFY-L24NKMU-A PCFY-L30NKMU-A PCFY-L30NKMU-A PCFY-L36NKMU-A PCFY-L36NKMU-A CONTENTS 1. SAFETY PRECAUTION ......2 2. PART NAMES AND FUNCTIONS ..7 3.
Page 2 SAFETY PRECAUTION MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT This unit uses a flammable refrigerant. WARNING If the refrigerant leaks and comes in contact with fire or a heating part, it will create a harmful gas and there is risk of fire. Read the OPERATION MANUAL carefully before operation.
Page 3 [1] Warning for service (1) Do not alter the unit. (2) For installation and relocation work, follow the instructions in the Installation Manual and use tools and pipe components specifically made for use with refrigerant specified in the outdoor unit installation manual. (3) Ask a dealer or an authorized technician to install, relocate and repair the unit.
Page 4 [4] Cautions for unit using R454B refrigerant Basic work procedures are the same as those for conventional units using refrigerant R410A. However, pay careful attention to the following points: (1) Information on servicing (1-1) Checks on the area Prior to beginning work on systems containing FLAMMABLE REFRIGERANTS, safety checks are necessary to ensure that the risk of ignition is minimized.
Page 5 (5) Detection of flammable refrigerants Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used. The following leak detection methods are deemed acceptable for all refrigerant systems. Electronic leak detectors may be used to detect refrigerant leaks but, in the case of FLAMMABLE REFRIGERANTS, the sensitivity may not be adequate, or may need re-calibration.
Page 6 j) When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the equipment are removed from site promptly and all isolation valves on the equipment are closed off. k) Recovered refrigerant shall not be charged into another REFRIGERATING SYSTEM unless it has been cleaned and checked.
Page 7 PART NAMES AND FUNCTIONS 2-1. Indoor unit Louver Air outlet Vane Filter (Inside of Air intake) Air intake 2-2. WIRED REMOTE CONTROLLER <PAR-42MAAUB> <PAC-YT53CRAU> The functions which can be used are restricted according to each model. : Supported : Unsupported PAR-42MAAUB Function PAC-YT53CRAU...
Page 8 SPECIFICATION 3-1. SPECIFICATIONS Service ref. PCFY-L15NKMU-A PCFY-L24NKMU-A PCFY-L30NKMU-A PCFY-L36NKMU-A Power source 1-phase 208/230V 60Hz Cooling capacity *1 kW 10.6 *1 Btu/h ( Nominal ) 15 , 000 24 , 000 30 , 000 36 , 000 Power input 0.03 0.04 0.09 0.11 Current input...
Page 9 3-2. ELECTRICAL PARTS SPECIFICATIONS Service Ref. PCFY-L30NKMU-A Symbol PCFY-L15NKMU-A PCFY-L24NKMU-A PCFY-L36NKMU-A Parts name Room temperature TH21 Resistance 30°F/15.8kΩ, 50°F/9.6kΩ, 70°F/6.0kΩ, 80°F/4.8kΩ, 90°F/3.9kΩ, 100°F/3.2kΩ thermistor Liquid pipe thermistor TH22 Resistance 30°F/15.8kΩ, 50°F/9.6kΩ, 70°F/6.0kΩ, 80°F/4.8kΩ, 90°F/3.9kΩ, 100°F/3.2kΩ Gas pipe thermistor TH23 Resistance 30°F/15.8kΩ, 50°F/9.6kΩ, 70°F/6.0kΩ, 80°F/4.8kΩ, 90°F/3.9kΩ, 100°F/3.2kΩ Fuse FUSE 250V 6.3A...
Page 10 3-4. NOISE CRITERION CURVES PCFY-L15NKMU-A PCFY-L24NKMU-A External static pressure : 0Pa External static pressure : 0Pa Power source : 208/230V, 60Hz Power source : 208/230V, 60Hz Middle2 Middle2 High High Middle1 Middle1 70.0 70.0 65.0 65.0 60.0 60.0 NC-60 NC-60 55.0 55.0 50.0...
Page 11 3-5. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS ■ PCFY-L15NKMU-A How to read curves 50(20) Duct characteristics Curve in the at site graphs Q … Designed amount of fresh air intake -50(-20) <CMM(CFM)> A … Static pressure loss of fresh air -100(-40) intake duct system with airflow -150(-60)
Page 12 OUTLINES AND DIMENSIONS PCFY-L15NKMU-A Unit : mm (in.) OCH865...
Page 13 PCFY-L24NKMU-A Unit : mm (in.) OCH865...
Page 14 PCFY-L30NKMU-A Unit : mm (in.) PCFY-L36NKMU-A OCH865...
Page 15 WIRING DIAGRAM OCH865...
Page 16 REFRIGERANT SYSTEM DIAGRAM Refrigerant flow in cooling Refrigerant flow in heating Strainer (#50 mesh) Gas pipe thermistor TH23 Gas pipe Liquid pipe thermistor TH22 Flare connection Liquid pipe Heat exchanger Linear expansion valve Strainer1 (#50 mesh) Strainer2 (#100 mesh) Strainer (#100 mesh) Room temperature thermistor TH21 Refrigerant pipe diameter Unit : mm (in.)
Page 17 MICROPROCESSOR CONTROL INDOOR UNIT CONTROL 7-1. COOL OPERATION <How to operate> Press ON/OFF button. Press [F1] button to display COOL. 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 18 Control Mode Control Details Remarks 3. Drain pump 3-1. Drain pump control • The drain pump will always run when the unit is in COOL or DRYING mode. (Regardless of the thermo ON/OFF) • Whenever the operation is changed over to the other modes (including Stop), the drain pump will stop pumping after approximately 3 minutes.
Page 19 7-2. 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 20 7-3. 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 21 7-4. 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 22 Control Mode Control Details Remarks 2-1. Hot adjust mode "Heat Standby" will be displayed during the The fan controller becomes the hot adjust mode for the following conditions. hot adjust mode. When starting 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 23 7-5. 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 24 TROUBLESHOOTING 8-1. COUNTERMEASURES FOR ERROR DURING TEST RUN If a problem occurs during test run, a code number will appear on the remote controller (or LED on the outdoor unit), and the air conditioning system will automatically cease operating. Refer to the connected outdoor unit service manual in order to determine the nature of the abnormality and apply corrective measure.
Page 25 8-2. HOW TO CHECK THE PARTS Parts name Checkpoints Room temperature Disconnect the connector then measure the resistance with a multimeter. thermistor (TH21) (At the ambient temperature 50°F~86°F) Liquid pipe thermistor (TH22) Normal Abnormal Gas pipe thermistor (Refer to the next page for a detail.) 4.3 kΩ~9.6 kΩ...
Page 26 Parts name Checkpoint Refrigerant sensor Measure the resistance between the terminals with a multimeter. Normal Abnormal Below 10 Ω Open (10 Ω or more) After turning off the indoor unit breaker and leaving it for 5 minutes, measure the resistance value between the sensor terminals. <...
Page 27 <Output pulse signal and the valve operation> Closing a valve : 1 → 2 → 3 → 4 → 1 Output Output Opening a valve : 4 → 3 → 2 → 1 → 4 (Phase) The output pulse shifts in above order. Φ1 Φ2 Note:...
Page 28 8-2-3. DC Fan motor (fan motor/indoor controller circuit board) Check method of DC fan motor (fan motor/indoor controller circuit board) Notes · High voltage is applied to the connecter (CNMF) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNMF) for the motor with the power supply on. board and fan motor.) (It causes trouble of the indoor controller circuit Self check...
Page 29 8-2-4. Refrigerant sensor Check code Refrigerant leakage 1521/1522 (FL) Abnormal points and detection methods Causes and checkpoints Refrigerant is leaking from the air conditioner. • Refrigerant leak from air conditioner The refrigerant sensor has detected refrigerant leak. • Refrigerant leak from piping Refrigerant is leaking in the room where the alarm is beeping.
Page 30 Check code Refrigerant sensor error 5558 (FH) Abnormal points and detection methods Causes and checkpoints A refrigerant sensor has failed. • A refrigerant sensor connected to an M-IC has failed. • A Sensor and Alarm Kit connected to a branch box has failed.
Page 31 8-3. FUNCTION OF DIP SWITCH Operation by switch Effective Switch Pole Function Remarks timing Thermistor <Room temperature Built-in remote controller Indoor unit detection> position <Initial setting> Filter clogging detection Provided Not provided Filter cleaning 2,500 hr 100 hr 1 2 3 4 5 6 7 8 9 10 Note : Fresh air intake Effective...
Page 32 Effective Operation by switch Remarks Switch Pole Function timing How to set address <Initial setting> SW11 SW12 SW11 Example : If address is "3", remain 1s digit SW11 SW12 address SW12 (for over 10) at "0", and match setting SW11 (for 1 to 9) with "3". SW12 10s digit Before...
Page 33 The black square (■) indicates a switch position. Effective Operation by switch Switch Pole Function Remarks timing Setting the ceiling height Depends on the combination of SW21-1and <Initial setting> SW21-2 Setting the ceiling height SW21 Not used Not used Not used Under Function suspension...
Page 34 8-4. TEST POINT DIAGRAM 8-4-1. Indoor controller board LED2 CN3M CN2A Power supply for MA-Remote controller Connect to the terminal block (TB5) Connect to the terminal block (TB15) (M-NET transmission connecting wire) (MA-Remote controller connecting wire) : 24-30 VDC (non-polar) : 8.7-13 VDC (non-polar) SW21 Function setting...
Page 35 DISASSEMBLY PROCEDURE NOTE: Turn OFF the power supply before disassembly. Be careful when removing heavy parts. OPERATING PROCEDURE PHOTOS/FIGURES Figure 1 1. Removing the air intake grille (1) Slide the air intake grille holding knobs (at 2 or 3 loca- tions) to the rear to open the air intake grille.
Page 36 OPERATING PROCEDURE PHOTOS/FIGURES 3. Removing the room temperature thermistor (TH21) Photo 4 Casing (1) Remove the air intake grille. (See Figure 1, 2) (2) Remove the screw from the beam and remove the beam. (See Photo 1) (3) Remove 2 screws from the electrical cover, and remove the electrical cover.
Page 37 OPERATING PROCEDURE PHOTOS/FIGURES 5. Removing the fan (3 connection) (1) Remove the air intake grille. (See Figure 1, 2) Photo 9 (2) Remove the screw from the beam and remove the beam. (See Photo 1) (3) Remove 2 screws from the electrical cover, and remove the electrical cover.
Page 38 OPERATING PROCEDURE PHOTOS/FIGURES Photo 12 7-1. Removing the vane motor Connector of vane motor Screw of (1) Remove the air intake. (See Figure 1, 2) R454B sensor Vane motor and cover R454B sensor (2) Remove the right side panel. (See Figure 3) (3) Remove the connector of vane motor.
Page 39 OPERATING PROCEDURE PHOTOS/FIGURES Photo 17 10. Removing the pipe thermistors/Liquid (TH22) and Gas (TH23) (1) Remove the air intake grille. (See Figure 1, 2) (2) Remove the left and right side panels. (See Figure 3) (3) Remove the under panel. (See Photo 13) (4) Remove the drain pan.
Page 40 OPERATING PROCEDURE PHOTOS/FIGURES Photo 21 13. Removing the heat exchanger, LEV and LEV coil (1) Remove the air intake grille. (See Figure 1, 2) (2) Remove the beam. (See Photo 1) (3) Remove the electrical cover. (See Photo 1) (4) Pull the electrical box downward. (See Photo 2) (5) Disconnect the connector CN60 from the indoor con- troller board.
Page 41 REMOTE CONTROLLER 10-1. REMOTE CONTROLLER FUNCTIONS <PAR-42MAAUB> 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 42 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 43 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 44 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 RC alarm test Maintenance information Model name input Serial No. input Dealer information input Initialize maintenance info.
Page 45 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 46 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 47 <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 48 <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 49 10-2. 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 seri- Error information al number will appear. Error code 2502 Error unit...
Page 50 • 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 Cleaning Errors cannot be reset from this screen. Main menu: RETURN Cursor SELECT...
Page 51 10-3. 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 52 10-4. TEST RUN 10-4-1. PAR-42MAAUB 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 53 10-4-2. 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 54 10-5. FUNCTION SETTING 10-5-1. PAR-42MAAUB 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 55 10-6. 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 56 10-7. SELF-DIAGNOSIS 10-7-1. PAR-42MAAUB 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 57 10-7-2. PAR-SL101A-E button 1 to stop the air conditioner. 1. Press the button 3 is on), press the 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 58 10-9. 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 59 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU TOKYO 100-8310, JAPAN ©Copyright 2024 MITSUBISHI ELECTRIC CORPORATION Published: Jul. 2024 No. OCH865 Specifications are subject to change without notice. Made in Japan...

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