Mitsubishi Electric CITY MULTI PKFY Series Technical & Service Manual

Split-type, heat pump air conditioners

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Technical & service manual (35 pages)

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

Indoor unit

[Model Name]

PKFY-MS10VLM-E

PKFY-MS10VLM-ET

PKFY-MS15VLM-E

PKFY-MS15VLM-ET

PKFY-MS20VLM-E

PKFY-MS20VLM-ET

PKFY-MS25VLM-E

PKFY-MS25VLM-ET

PKFY-MS32VLM-E

PKFY-MS32VLM-ET

PKFY-MS40VLM-E

PKFY-MS40VLM-ET

PKFY-MS50VLM-E

PKFY-MS50VLM-ET

INDOOR UNIT

[Service Ref.]

PKFY-MS10VLM-E.TH

PKFY-MS10VLM-ET.TH

PKFY-MS15VLM-E.TH

PKFY-MS15VLM-ET.TH

PKFY-MS20VLM-E.TH

PKFY-MS20VLM-ET.TH

PKFY-MS25VLM-E.TH

PKFY-MS25VLM-ET.TH

PKFY-MS32VLM-E.TH

PKFY-MS32VLM-ET.TH

PKFY-MS40VLM-E.TH

PKFY-MS40VLM-ET.TH

PKFY-MS50VLM-E.TH

PKFY-MS50VLM-ET.TH

Model name

indication

R32

CONTENTS

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

2. PARTS NAMES AND FUNCTIONS ········ 8

3. SPECIFICATION ································ 9

4. NOISE CRITERION CURVES ············· 12

5. OUTLINES AND DIMENSIONS ··········· 14

6. WIRING DIAGRAM ··························· 16

7. REFRIGERANT SYSTEM DIAGRAM ··· 17

8. TROUBLESHOOTING ······················· 18

9. DISASSEMBLY PROCEDURE ············ 27

10. REMOTE CONTROLLER ··················· 32

PARTS CATALOG (OCB823)

August 2023

No. OCH823

Notes:

• This manual describes only

service data of the indoor units.

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Summary of Contents for Mitsubishi Electric CITY MULTI PKFY Series

Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS August 2023 No. OCH823 TECHNICAL & SERVICE MANUAL Indoor unit [Model Name] [Service Ref.] PKFY-MS10VLM-E.TH PKFY-MS10VLM-E Notes: PKFY-MS10VLM-ET.TH PKFY-MS10VLM-ET • This manual describes only service data of the indoor units. PKFY-MS15VLM-E.TH PKFY-MS15VLM-E PKFY-MS15VLM-ET.TH PKFY-MS15VLM-ET PKFY-MS20VLM-E.TH PKFY-MS20VLM-E PKFY-MS20VLM-ET.TH PKFY-MS20VLM-ET...
Page 2: Safety Precaution
SAFETY PRECAUTION MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT This mark is for R32 refrigerant only. Refrigerant type is written on nameplate of outdoor unit. WARNING Read the OPERATION MANUAL carefully before operation. Service personnel are required to carefully read the OPERATION MANUAL and INSTALLATION MANUAL before operation. Further information is available in the OPERATION MANUAL, INSTALLATION MANUAL, and the like.
Page 3: Cautions For Service
[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 R32 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 (3) Repair to intrinsically Safe Components Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible voltage and current permitted for the equipment in use. Intrinsically safe components are the only types that can be worked on while live in the presence of a flammable atmosphere.
Page 6 a) Become familiar with the equipment and its operation. b) Isolate system electrically. c) Before attempting the procedure, ensure that: • mechanical handling equipment is available, if required, for handling refrigerant cylinders; • all personal protective equipment is available and being used correctly; •...
Page 7: Service Tools
Unit Electronic weighing scale [3] Service tools Use the below service tools as exclusive tools for R32 refrigerant. Tool name Specifications Gauge manifold · Only for R32 · Use the existing fitting specifications . (UNF1/2) · Use high-tension side pressure of 5.3 MPa·G or over. Charge hose ·...
Page 8: Parts Names And Functions
PARTS NAMES AND FUNCTIONS 2-1. Indoor unit Filter Air intake Front Panel Emergency operation switch Operation indicator lamp Louver Air outlet Vane Remote control receiving section 2-2. Wired Remote Controller <PAR-41MAAB> Wired remote controller function The functions which can be used are restricted according to each model. : Supported : Unsupported PAR-41MAAB...
Page 9: Specification
SPECIFICATION 3-1. SPECIFICATIONS Model PKFY-MS10VLM-E PKFY-MS15VLM-E PKFY-MS20VLM-E PKFY-MS25VLM-E PKFY-MS10VLM-ET PKFY-MS15VLM-ET PKFY-MS20VLM-ET PKFY-MS25VLM-ET Power source 1-phase 220-240 V 50 Hz, 1-phase 220 V 60 Hz Cooling capacity (Nominal) kcal/h 1000 1500 1900 2400 BTU/h 4100 5800 7500 9600 Power input 0.02 0.02 0.02 0.03...
Page 10 Model PKFY-MS32VLM-E PKFY-MS40VLM-E PKFY-MS50VLM-E PKFY-MS32VLM-ET PKFY-MS40VLM-ET PKFY-MS50VLM-ET Power source 1-phase 220-240 V 50 Hz, 1-phase 220 V 60 Hz Cooling capacity (Nominal) kcal/h 3100 3900 4800 BTU/h 12300 15400 19100 Power input 0.04 0.04 0.05 Current input A 0.35 0.35 0.45 Heating capacity (Nominal)
Page 11: Electrical Parts Specifications
3-2. ELECTRICAL PARTS SPECIFICATIONS Service ref. PKFY-MS10VLM-(E/ET).TH PKFY-MS32VLM-(E/ET).TH PKFY-MS15VLM-(E/ET).TH PKFY-MS40VLM-(E/ET).TH Symbol PKFY-MS20VLM-(E/ET).TH PKFY-MS50VLM-(E/ET).TH PKFY-MS25VLM-(E/ET).TH Parts name Room temperature TH21 Resistance 0°C/15 kΩ, 10°C/9.6 kΩ, 20°C/6.3 kΩ, 25°C/5.4 kΩ, 30°C/4.3 kΩ, 40°C/3.0 kΩ detection thermistor Pipe temperature TH22 Resistance 0°C/15 kΩ, 10°C/9.6 kΩ, 20°C/6.3 kΩ, 25°C/5.4 kΩ, 30°C/4.3 kΩ, 40°C/3.0 kΩ detection thermistor/liquid Pipe temperature TH23...
Page 12: Noise Criterion Curves
NOISE CRITERION CURVES NOISE CRITERION CURVES PKFY-MS15VLM-(E/ET) PKFY-MS10VLM-(E/ET) NC-70 NC-70 NC-60 NC-60 NC-50 NC-50 NC-40 NC-40 NC-30 NC-30 Approximate minimum NC-20 audible limit on NC-20 Approximate minimum continuous noise audible limit on continuous noise 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz...
Page 13 PKFY-MS40VLM-(E/ET) PKFY-MS32VLM-(E/ET) 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 audible limit on continuous noise continuous noise NC-20 NC-20 1000 2000 4000 8000 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz BAND CENTER FREQUENCIES, Hz PKFY-MS50VLM-(E/ET) NC-70...
Page 14: Outlines And Dimensions
OUTLINES AND DIMENSIONS PKFY-MS10VLM-(E/ET).TH PKFY-MS15VLM-(E/ET).TH PKFY-MS20VLM-(E/ET).TH PKFY-MS25VLM-(E/ET).TH PKFY-MS32VLM-(E/ET).TH Unit: mm OCH823...
Page 15 PKFY-MS40VLM-(E/ET).TH PKFY-MS50VLM-(E/ET).TH Unit: mm OCH823...
Page 16: Wiring Diagram
WIRING DIAGRAM TO NEXT Table 1> < INDOOR UNIT The black square (■) indicates a switch position. TB15 TO MA-REMOTE PULL Models Models CONTROLLER When attaching drain pump kit (OPTION PART) DC8.7-13V 6 5 4 3 2 1 6 5 4 3 2 1 FUSE FLOAT SW (16A)
Page 17: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Refrigerant flow in cooling Refrigerant flow in heating Pipe temperature detection thermistor/gas (TH23) Gas pipe Flare Strainer (#50mesh) Pipe temperature detection thermistor/liquid (TH22) Liquid pipe Strainer Heat exchanger (#100mesh) Linear expansion valve Room temperature detection Strainer thermistor (TH21) (#100mesh) Unit: mm (inch) Gas pipe...
Page 18: Troubleshooting
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 19 8-2. HOW TO CHECK PARTS Parts name Checkpoints Room temperature Disconnect the connector then measure the resistance with a multimeter. detection thermistor (TH21) (At the ambient temperature 10 to 30°C) Pipe temperature detection thermistor/liquid (TH22) Normal Refer to “8-2-1. Thermistor”. Pipe temperature detection 4.3 to 9.6 kΩ...
Page 20 8-2-1. Thermistor <Thermistor characteristic graph> < Thermistor for lower temperature > Room temperature detection thermistor (TH21) Thermistors for Pipe temperature detection thermistor/liquid (TH22) lower temperature Pipe temperature detection thermistor/gas (TH23) Thermistor R =15 kΩ ± 3% Fixed number of B=3480 ± 2% Rt=15exp { 3480( 273+t 0°C...
Page 21 8-2-3. DC Fan motor (fan motor/indoor controller board) Check method of indoor fan motor (fan motor/indoor controller board) 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 board and fan motor.) Self check Conditions : The indoor fan cannot rotate.
Page 22 <Output pulse signal and the valve operation> The output pulse shifts in below order. Output Output Closing a valve : 1 → 2 → 3 → 4 → 1 (Phase) Opening a valve : 4 → 3 → 2 → 1 → 4 Ø1 •...
Page 23 8-3. FUNCTION OF DIP SWITCH 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> Filter clogging Provided Not provided Filter sign indication 2,500 hr...
Page 24 The black square ( ) indicates a switch position. Effective Switch Pole Function Remarks timing (High ceiling) Under Address board operation (Standard) <Initial setting> suspension It follows as the left table. (Silent) SW11 SW12 SW11 Address board 1s digit address <Initial setting>...
Page 25: Test Point Diagram
8-4. TEST POINT DIAGRAM 8-4-1. Indoor controller board (I.B) CN105 CN2M LED1 IT Terminal M-NET transmission connecting wire Vane motor (MV1,MV2) Main power supply 24 − 30 VDC (non-polar) 12 VDC pulse output (Indoor unit : 220 − 240 V) CN60 Linear expansion valve(LEV) 12 VDC pulse output...
Page 26 8-4-2. PCB FOR WIRELESS REMOTE CONTROLLER (W.B), SWITCH BOARD (S.B) and LED BOARD (L.B) 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) Connect to Receiving unit INDOOR CONTROLLER BOARD ( I.B )
Page 27: Disassembly Procedure
DISASSEMBLY PROCEDURE 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 driver to the hole at VANE LOWER shaft and VANE UPPER shaft VANE UPPER slide the VANE LOWER shaft (2 places each).Push VANE Front panel...
Page 28 OPERATION PROCEDURE PHOTOS/FIGURES 3. REMOVING THE ADDRESS BOARD, THE INDOOR Photo 4 CONTROLLER BOARD, THE WIRELESS CONTROLLER BOARD, LED BOARD Holder of wireless remote Switch board holder controller board and LED board (Holder of switch board) (1) Remove the panel and the corner box. (Refer to procedure 1) Address board (2) Remove the front and side electrical box covers (2 screws...
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) (2) Remove the electrical box (Refer to procedure 2) and the Motor band nozzle assembly (Refer to procedure 4).
Page 30 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 2) and the nozzle assembly (Refer to procedure 4). (3) Remove the water cover.
Page 31 OPERATION PROCEDURE PHOTOS/FIGURES 11. REMOVING THE R32 SENSOR Photo 16 (see the bottom) (1) Remove the panel and corner box. (Refer to procedure 1) Screw of the (2) Remove the electrical box covers. (Refer to procedure 2) R32 sensor (3) Disconnect the R32 sensor connector (CNSA) on the indoor controller board.
Page 32: Remote Controller
REMOTE CONTROLLER 10-1. REMOTE CONTROLLER FUNCTIONS <PAR-41MAAB> 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 33 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 34: Menu Structure
Menu structure Main menu Press the button. Move the cursor to the desired item with the buttons, and press the button. Operation Vane · 3D i-see · Vent. (Lossnay) High power Comfort Manual vane angle Vertical air direction Horizontal air direction 3D i-see Sensor Timer menu Timer...
Page 35 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 Refrigerant system check Maintenance information Collect model names and serial No. Model name input Serial No.
Page 36: Main Menu List
Main menu list Main Setting and display items Setting details menu Operation Vane · 3D i-see · Vent. Vane: Use to set the vertical air direction. (Vane.Vent. (Lossnay)) Louver: Use to set the horizontal air direction. 3D i-see Sensor: This setting is available only for the air conditioners that support easy setting function of motion sensing air direction.
Page 37 Main Setting and display items Setting details menu Initial Basic Main/Supervisor For a system that requires supervisor remote controller, set the remote setting setting controller to "Supervisor" from this setting. 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 38: Controller Interface
<PAR-SL97A-E> Controller interface Transmission area Transmission indicator Remote controller display Timer indicator *For explanation purposes, all of the items that appear in the display are shown. *All items are displayed when the Reset button is pressed. Operation areas ON/OFF button Temperature setting buttons Fan Speed button (Changes fan speed) Timer Off button...
Page 39 <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/ i-see button* down airflow direction) Timer ON button Menu button Timer OFF button SET/SEND button Weekly timer ON/OFF button* CANCEL button...
Page 40: Error Information
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, date and time of occur- Error information rence, model name, and serial number will appear. Error code 2502 The model name and serial number will appear only if the informa-...
Page 41 • Checking the error information While no errors are occurring, page 2/2 of the error information can be Maintenance menu viewed by selecting ˝Error information˝ from the Maintenance menu. Error information Filter information Errors cannot be reset from this screen. Cleaning Main menu: Cursor...
Page 42: Service Menu
10-3. SERVICE MENU Maintenance password is required 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Main Main menu *At the main display, the menu button and select ˝Service˝ to make Service the maintenance setting. 2. When the Service menu is selected, a window will appear asking for the pass- Service menu word.
Page 43: Test Run Operation
10-4. TEST RUN 10-4-1. PAR-41MAAB 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Test run Input maintenance info. Settings Check Others Select ˝Test run˝ with the F1 or F2 button, and press the [ ] button. 2.
Page 44 10-4-2. PAR-SL97A-E Measure an impedance between the power supply terminal block on the outdoor unit and ground with a 500 V Megger and check that it is equal to or greater than 1.0 MΩ. TEST RUN 1. Turn on the main power to the unit. TEST RUN 2.
Page 45: Function Setting
10-5. FUNCTION SETTING 10-5-1. PAR-41MAAB Settings menu 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Function setting Lossnay Select ˝Setting˝ from the Service menu, and press the [ ] button. Service menu: Cursor Select ˝Function setting˝, and press the [ ] button.
Page 46: Error History
10-6. ERROR HISTORY 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Test run Input maintenance info. Settings Check Others Select ˝Check˝ with the F1 or F2 button, and press the [ button. 2. Select ˝Error history˝ with the F1 or F2 button, and press Check menu the [ ] button.
Page 47: Self-Diagnosis
10-7. SELF-DIAGNOSIS 10-7-1. PAR-41MAAB 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Diagnosis Self check Select ˝Check˝ from the Service menu, Remote controller check and press the [ ] button. Service menu: Select ˝Diagnosis˝ from the Check menu, Cursor and press the [ ] button.
Page 48 10-7-2. PAR-SL97A-E < Malfunction-diagnosis method at maintenance service> Refrigerant [Procedure] address display 1. Press the CHECK button twice. CHECK • ˝CHECK˝ lights, and refrigerant address ˝00˝ blinks. CHECK display • Check that the remote controller's display has stopped before continuing. Temperature button TEMP...
Page 49: Remote Controller Check
10-8. 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, Diagnosis and press the [ ] button. Self check Remote controller check Select ˝Check˝ from the Service menu, Service menu: and press the [ ] button.
Page 50 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU TOKYO 100-8310, JAPAN ©Copyright 2023 MITSUBISHI ELECTRIC CORPORATION Published: Aug. 2023 No. OCH823 Made in Japan Specifications are subject to change without notice.

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Mitsubishi Electric CITY MULTI PKFY Series Technical & Service Manual

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