Mitsubishi Electric CITY MULTI PCFY Series Technical & Service Manual

Ceiling suspended r410a

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Technical & service manual (48 pages)

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

Series PCFY

Indoor unit

[Model names]

[Service Ref.]

PCFY-P15NKMU-ER2.TH

PCFY-P15NKMU-E

PCFY-P24NKMU-ER2.TH

PCFY-P24NKMU-E

PCFY-P30NKMU-ER2.TH

PCFY-P30NKMU-E

PCFY-P36NKMU-ER2.TH

PCFY-P36NKMU-E

INDOOR UNIT

R410A

CONTENTS

10. REMOTE CONTROLLER ..................... 35

Model name

indication

No. TCH131

REVISED EDITION-A

Revision:

• Some descriptions have

been revised in REVISED

EDITION-A

TCH131 is void.

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

2. PART NAMES AND FUNCTIONS .......... 4

3. SPECIFICATION ..................................... 5

4. OUTLINES AND DIMENSIONS .............. 9

5. WIRING DIAGRAM ............................... 12

6. REFRIGERANT SYSTEM DIAGRAM ........ 13

7. MICROPROCESSOR CONTROL ............... 14

8. TROUBLESHOOTING .......................... 21

9. DISASSEMBLY PROCEDURE ............. 29

PARTS CATALOG (TCB131)

January 2025

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Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS January 2025 No. TCH131 REVISED EDITION-A TECHNICAL & SERVICE MANUAL Series PCFY R410A Indoor unit [Model names] [Service Ref.] Revision: PCFY-P15NKMU-ER2.TH • Some descriptions have PCFY-P15NKMU-E been revised in REVISED EDITION-A PCFY-P24NKMU-ER2.TH TCH131 is void. PCFY-P24NKMU-E PCFY-P30NKMU-ER2.TH PCFY-P30NKMU-E...
Page 2: Safety Precaution
SAFETY PRECAUTION Cautions for units utilizing refrigerant R410A Use a vacuum pump with a reverse flow check Do not use the existing refrigerant piping. valve. The old refrigerant and lubricant in the existing piping Vacuum pump oil may flow back into refrigerant cycle and contains a large amount of chlorine which may cause the that can cause deterioration of refrigerant oil, etc.
Page 3: Cautions For Service
[1] Cautions for service (1) Perform service after collecting the refrigerant left in the unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. (4) When performing service, install a filter drier simultaneously. Be sure to use a filter drier for new refrigerant.
Page 4: Part Names And Functions
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-41MAA> <PAC-YT53CRA> The functions which can be used are restricted according to each model. : Supported : Unsupported PAR-41MAA Function PAC-YT53CRA...
Page 5: Specification
SPECIFICATION 3-1. SPECIFICATIONS Service ref. PCFY-P15NKMU-ER2.TH PCFY-P24NKMU-ER2.TH PCFY-P30NKMU-ER2.TH PCFY-P36NKMU-ER2.TH Power source 1-phase 208/230V 60Hz Cooling capacity *1 kW 10.6 ( Nominal ) *1 Btu/h 15 , 000 24 , 000 30 , 000 36 , 000 Power input 0.03 0.04 0.09 0.11 Current input...
Page 6: Electrical Parts Specifications
3-2. ELECTRICAL PARTS SPECIFICATIONS Service Ref. PCFY-P30NKMU-ER2.TH Symbol PCFY-P15NKMU-ER2.TH PCFY-P24NKMU-ER2.TH PCFY-P36NKMU-ER2.TH 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 250V 6.3A FUSE...
Page 7 3-4. NOISE CRITERION CURVES PCFY-P15NKMU-ER2.TH PCFY-P24NKMU-ER2.TH External static pressure : 0Pa External static pressure : 0Pa Power source : 208/230V, 60Hz Power source : 208/230V, 60Hz High Middle2 High Middle2 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 8 3-5. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS ■ PCFY-P15NKMU-ER2.TH 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 9: Outlines And Dimensions
OUTLINES AND DIMENSIONS PCFY-P15NKMU-ER2.TH Unit : inch(mm) TCH131A...
Page 10 PCFY-P24NKMU-ER2.TH Unit : inch(mm) TCH131A...
Page 11 PCFY-P30NKMU-ER2.TH Unit : inch(mm) PCFY-P36NKMU-ER2.TH TCH131A...
Page 12: Wiring Diagram
WIRING DIAGRAM PCFY-P15NKMU-ER2.TH PCFY-P24NKMU-ER2.TH PCFY-P30NKMU-ER2.TH PCFY-P36NKMU-ER2.TH TCH131A...
Page 13: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM PCFY-P15NKMU-ER2.TH PCFY-P24NKMU-ER2.TH PCFY-P30NKMU-ER2.TH PCFY-P36NKMU-ER2.TH Refrigerant flow in cooling Refrigerant flow in heating Strainer (#100 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 temparature thermistor TH21...
Page 14: Microprocessor Control
MICROPROCESSOR CONTROL INDOOR UNIT CONTROL 7-1. COOL OPERATION <How to operate> 1 Press ON/OFF button. 2 Press [F1] button to display COOL. 3 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 15 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 16: Drying Operation
7-2. DRYING OPERATION <How to operate> 1 Press ON/OFF button. 2 Press [F1] button to display DRYING. 3 Press [F2] [F3] button to set the set temperature. RETURN SELECT MENU HOLD <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display DRYING. 3 Press the TEMP.
Page 17: Fan Operation
7-3. FAN OPERATION <How to operate> 1 Press ON/OFF button. 2 Press [F1] button to display FAN. RETURN SELECT MENU HOLD <How to operate> 1 Press POWER ON/OFF button. 2 Press the operation MODE button to display FAN. Control Mode Control Details Remarks 1. Temperature Set by remote controller.
Page 18: Heat Operation
7-4. HEAT OPERATION <How to operate> 1 Press ON/OFF button. 2 Press [F1] button to display HEAT. 3 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 19: Control Mode
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. 1 When starting HEAT operation 2 When the temperature adjustment function changes from OFF to ON. The step change 3 When release the HEAT defrosting operation of A to B will not be...
Page 20: Auto Operation [Automatic Cool/Heat Change Over Operation]
7-5. AUTO OPERATION [AUTOMATIC COOL/HEAT CHANGE OVER OPERATION] <How to operate> 1 Press ON/OFF button. 2 Press [F1] button to display AUTO. 3 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 21: Troubleshooting
TROUBLESHOOTING 8-1. HOW TO CHECK THE PARTS PCFY-P15NKMU-ER2.TH PCFY-P24NKMU-ER2.TH PCFY-P30NKMU-ER2.TH PCFY-P36NKMU-ER2.TH Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. thermistor (TH21) (At the ambient temperature 50_F~86_F) Liquid pipe thermistor (TH22) Normal Abnormal (Refer to the next page for a detail.) Gas pipe thermistor 4.3k"~9.6k"...
Page 22 8-1-1. Thermistor <Thermistor characteristic graph> < Thermistor for lower temperature > Room temperature detection thermistor (TH21) Thermistor for Pipe temperature detection thermistor/liquid (TH22) lower temperature Pipe temperature detection thermistor/gas (TH23) Thermistor R =15kΩ ± 3% Fixed number of B=3480 ± 2% Rt=15exp { 3480( 273+(t-32)/1.8 30°F...
Page 23 <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 Note: Φ2...
Page 24 8-1-3. 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 25 8-2. 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 26 Operation by switch Effective Switch Pole Function Remarks timing How to set address <Initial setting> SW11 SW12 SW11 1s digit Example : If address is "3", remain SW12 SW11 address SW12 (for over 10) at "0", and match setting SW11 (for 1 to 9) with "3". SW12 10s digit Before...
Page 27 The black square (■) indicates a switch position. Operation by switch Effective 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 28: Test Point Diagram
8-3. TEST POINT DIAGRAM 8-3-1. Indoor controller board PCFY-P15NKMU-ER2.TH PCFY-P24NKMU-ER2.TH PCFY-P30NKMU-ER2.TH PCFY-P36NKMU-ER2.TH LED2 CN3M CN2A Power supply for MA-Remote controller Connect to the terminal block (TB5) Connect to the therminal block (TB15) (M-NET transmission connecting wire) (MA-Remote controller connecting wire) : 24-30 VDC (non-polar) 1-2 : 8.7-13 VDC (non-polar) SW21...
Page 29: Disassembly Procedure
DISASSEMBLY PROCEDURE PCFY-P15NKMU-ER2.TH PCFY-P24NKMU-ER2.TH Be careful when removing heavy parts. PCFY-P30NKMU-ER2.TH PCFY-P36NKMU-ER2.TH (Photo: PCFY-P36NKMU-ER2.TH) OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 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 30 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 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 31 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 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 32 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Photo 12 7. Removing the vane motor (1) Remove the air intake. (See Figure 1, 2) Vane motor and cover Connector (2) Remove the right side panel. (See Figure 3) (3) Remove the connector of vane motor. (4) Remove 2 screws of vane motor cover , then remove vane motor.
Page 33 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 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 34 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Photo 21 13. Removing the heat exchanger and LEV (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 (white) from the indoor controller board.
Page 35: Remote Controller
REMOTE CONTROLLER 10-1. 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 36: Room Temperature
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 37 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 38 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 39 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 40 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 41: Controller Interface
<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 42: Backlit Lcd
<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 43: 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, model name, and seri- Error information al number will appear. Error code The model name and serial number will appear only if the informa- Error unit...
Page 44 • 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 45: Service Menu
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 maintenance setting. Service 2. When the Service menu is selected, a window will appear asking for the pass- Service menu word.
Page 46: Test Run Operation
10-4. TEST RUN 10-4-1. 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 47 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 48: Function Setting
10-5. FUNCTION SETTING 10-5-1. 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 49 10-5-2. 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. 10-1) Press the button to set the ˝50˝. Direct the wireless remote controller toward the receiver of the indoor unit and press the button.
Page 50: Error History
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 51: Self-Diagnosis
10-7. SELF-DIAGNOSIS 10-7-1. 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 52 10-7-2. PAR-SL101A-E 1. Press the button 1 to stop the air conditioner. is on), press the button 3 to disable it ( is off). 2. Press the button 2 for 5 seconds. 3. Press the button 5 to select the refrigerant address (M-NET address) B of the indoor 4.
Page 53: 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, 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 54 HEAD OFFICE : TOKYO BLDG., 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: Jan. 2025. No. TCH131 REVISED EDITION-A Published: Nov. 2023. No. TCH131 Made in Thailand Specifications are subject to change without notice.

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Mitsubishi Electric CITY MULTI PCFY Series Technical & Service Manual

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