Mitsubishi Electric Mr. SLIM PLA Series Service Manual

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SPLIT-SYSTEM HEAT PUMP

SERVICE MANUAL

Indoor unit

[Model Name]

PLA-A12EA7

PLA-A18EA7

PLA-A24EA7

PLA-A30EA7

PLA-A36EA7

PLA-A42EA7

Grille model

[Model Name]

PLP-41EAEU

Model name

indication for

MAIN UNIT

ON/OFF

TEMP

IR WIRELESS REMOTE

CONTROLLER

(Option)

TCH070A.indd 1

[Service Ref.]

PLA-A12EA7R1.TH

PLA-A18EA7R1.TH

PLA-A24EA7R1.TH

PLA-A30EA7R1.TH

PLA-A36EA7R1.TH

PLA-A42EA7R1.TH

Model name

indication for GRILLE

INDOOR UNIT

RETURN SELECT

HOLD

OFF

WIRED REMOTE

CONTROLLER

(Option)

February 2022

No. TCH070

REVISED EDITION-A

Revision:

• OUTLINES AND DIMENSIONS

have been revised in REVISED

EDITION-A.

• Some descriptions have been

modified.

TCH070 is void.

Notes:

• This manual describes service data

of the indoor units only.

CONTENTS

1. REFERENCE MANUAL ........................ 2

2. SAFETY PRECAUTION ........................ 3

3. PARTS NAMES AND FUNCTIONS ...... 6

4. SPECIFICATIONS ............................... 15

5. NOISE CRITERION CURVES ............. 17

6. OUTLINES AND DIMENSIONS ............ 19

7. WIRING DIAGRAM ............................. 20

8. REFRIGERANT SYSTEM DIAGRAM ...... 21

9. TROUBLESHOOTING ........................ 22

10. FUNCTION SETTING ......................... 37

11. SPECIAL FUNCTION .......................... 38

12. DISASSEMBLY PROCEDURE ........... 42

PARTS CATALOG (TCB070)

7/2/2565 16:46:44

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Summary of Contents for Mitsubishi Electric Mr. SLIM PLA Series

Page 1: Table Of Contents
SPLIT-SYSTEM HEAT PUMP February 2022 No. TCH070 REVISED EDITION-A SERVICE MANUAL Indoor unit [Model Name] [Service Ref.] PLA-A12EA7R1.TH PLA-A12EA7 Revision: PLA-A18EA7R1.TH • OUTLINES AND DIMENSIONS PLA-A18EA7 have been revised in REVISED PLA-A24EA7R1.TH EDITION-A. PLA-A24EA7 • Some descriptions have been PLA-A30EA7R1.TH modified.
Page 2: Reference Manual
REFERENCE MANUAL OUTDOOR UNIT SERVICE MANUAL Service Manual No. Model Name Service Ref. Parts Catalog No. MXZ-3C24/30NA2, MXZ-4C36NA2 MXZ-3C24/30NA2-U1, MXZ-4C36NA2-U1 OBH702H MXZ-3C24/30NAHZ2 MXZ-3C24/30NAHZ2-U1 OBB702E MXZ-5C42NA2 MXZ-5C42NA2-U1 MXZ-4C36NAHZ2 MXZ-4C36NAHZ2-U1 MXZ-5C42NAHZ2 MXZ-5C42NAHZ2-U1 OCH730A MXZ-8C48NA2, MXZ-8C48NAHZ2 MXZ-8C48NA2-U1, MXZ-8C48NAHZ2-U1 OCB730A MXZ-8C60NA2 MXZ-8C60NA2-U1 PUZ-A12/18/36/42NK7(-BS) PUZ-A12/18/36/42NK7(-BS) PUZ-A24/30NHA7(-BS) PUZ-A24/30NHA7(-BS) OCH636D...
Page 3: Safety Precaution
SAFETY PRECAUTION 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. 2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilising refrigerant R410A Use the following tools specifically designed for Use new refrigerant pipes. use with R410A refrigerant.
Page 4 [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 5 [2] Cautions for service (1) Perform service after recovering 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 6: Parts Names And Functions
PARTS NAMES AND FUNCTIONS 3-1. INDOOR UNIT Drain pipe Air outlet Filter Liquid pipe Gas pipe Signal receiver i-see Sensor (Option) (Option) Model name Model name indication for Vane indication for GRILLE MAIN UNIT Air intake (Intake grille) TCH070A TCH070A.indd 6 TCH070A.indd 6 7/2/2565 16:46:45 7/2/2565 16:46:45...
Page 7 3-2. Wired Remote Controller <PAR-40MAA> 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 8 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 9 Main menu Press the button. MENU Move the cursor to the desired item with the buttons, and press the button. SELECT Operation Vane · Louver · Vent. (Lossnay) High power Comfort Manual vane angle 3D i-See sensor Timer menu Timer ON/OFF timer Auto-OFF timer Weekly timer...
Page 10 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 11 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 12 Setting and display Main menu Setting details items 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 13 3-3. IR WIRELESS REMOTE CONTROLLER (Option) PAR-FL32MA CHECK TEST RUN display CHECK and TEST RUN display indicate that the unit is being checked or test-run. display MODEL SELECT Blinks when model is selected. display Lights up while the signal is transmitted to the indoor unit when the button is pressed.
Page 14 3-4. IR WIRELESS REMOTE CONTROLLER (Option) PAR-SL100A-E Transmission area Not available Remote controller display Battery replacement indicator 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...
Page 15: Specifications
SPECIFICATIONS Service Ref. PLA-A12EA7R1.TH Power supply (phase, cycle, voltage) Single phase, 60 Hz, 208/230 V Max. Fuse Size Min Circuit Ampacity External finish (Panel) PLP-41EAEU: Munsell 1.0Y 9.2/0.2 Heat exchanger Plate fin coil Fan (drive) × No. Turbo fan (direct) × 1 Fan motor output 0.05 Fan motor...
Page 16 Service Ref. PLA-A30EA7R1.TH Power supply (phase, cycle, voltage) Single phase, 60 Hz, 208/230 V Max. Fuse Size Min Circuit Ampacity External finish (Panel) PLP-41EAEU: Munsell 1.0Y 9.2/0.2 Heat exchanger Plate fin coil Fan (drive) × No. Turbo fan (direct) × 1 Fan motor output 0.12 Fan motor...
Page 17: Noise Criterion Curves
NOISE CRITERION CURVES PLA-A12EA7R1.TH PLA-A18EA7R1.TH NOTCH SPL(dB) LINE NOTCH 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 APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR HEARING FOR NC-20 NC-20 CONTINUOUS CONTINUOUS NOISE NOISE...
Page 18 PLA-A36EA7R1.TH PLA-A42EA7R1.TH NOTCH SPL(dB) LINE NOTCH 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 APPROXIMATE THRESHOLD OF THRESHOLD OF HEARING FOR HEARING FOR NC-20 NC-20 CONTINUOUS CONTINUOUS NOISE NOISE 1000 2000 4000...
Page 19: Outlines And Dimensions
OUTLINES AND DIMENSIONS PLA-A12EA7R1.TH PLA-A18EA7R1.TH PLA-A24EA7R1.TH PLA-A30EA7R1.TH PLA-A36EA7R1.TH PLA-A42EA7R1.TH Unit: inch (mm) TCH070A TCH070A.indd 19 TCH070A.indd 19 7/2/2565 16:46:48 7/2/2565 16:46:48...
Page 20: Wiring Diagram
WIRING DIAGRAM PLA-A12EA7R1.TH PLA-A18EA7R1.TH PLA-A24EA7R1.TH PLA-A30EA7R1.TH PLA-A36EA7R1.TH PLA-A42EA7R1.TH [LEGEND] SYMBOL NAME SYMBOL NAME INDOOR CONTROLLER BOARD TERMINAL BLOCK (INDOOR/OUTDOOR CN2L CONNECTOR (LOSSNAY) CONNECTING LINE) CN32 CONNECTOR (REMOTE SWITCH) TERMINAL BLOCK (REMOTE CONTROLLER TB5, TB6 CN41 CONNECTOR (HA TERMINAL-A) TRANSMISSION LINE) CN51 CONNECTOR (CENTRALLY CONTROL) ROOM TEMP.
Page 21: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM PLA-A12EA7R1.TH PLA-A18EA7R1.TH PLA-A24EA7R1.TH PLA-A30EA7R1.TH PLA-A36EA7R1.TH PLA-A42EA7R1.TH Strainer (#50) Heat exchanger Refrigerant GAS pipe connection (Flare) Condenser/evaporator temperature thermistor (TH5) Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection (Flare) Pipe temperature thermistor/liquid (TH2) Room temperature thermistor (TH1) Strainer (#50) Distributor...
Page 22: Troubleshooting
TROUBLESHOOTING 9-1. TROUBLESHOOTING <Check code displayed by self-diagnosis and actions to be taken for service (summary)> Present and past check codes are logged, and they can be displayed on the wired remote controller and control board of out- door unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summa- rized in the table below.
Page 23 9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER <In case of trouble during operation> When a malfunction occurs to air conditioner, both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop. < Malfunction-diagnosis method at maintenance service> ■IR wireless remote controller PAR-FL32MA [Procedure] 1.
Page 24 • Refer to the following tables for details on the check codes. [Output pattern A] Beeper sounds Beep Beep Beep Beep Beep Beep Beep OPERATION · · · Repeated INDICATOR lamp blink pattern Approx. 2.5 s 0.5 s 0.5 s 0.5 s 0.5 s Approx.
Page 25 • On IR wireless remote controller The continuous buzzer sounds from receiving section of indoor unit. Blink of operation lamp • On wired remote controller 1 Check code displayed in the LCD. (Refer to the previous page, 1 check code.) •...
Page 26 Note: Errors to be detected in outdoor unit, such as codes starting with F, U or E (excluding E0 to E7), 9-3. SELF-DIAGNOSIS ACTION TABLE are not covered in this document. Please refer to the outdoor unit service manual for the details. Check code Abnormal point and detection method Cause...
Page 27 Check code Abnormal point and detection method Cause Countermeasure Drain overflow protection operation 1 Malfunction of drain pump 1 Check if drain-up machine works. 1 Suspensive abnormality, if drain float 2 Defective drain 2 Check drain function. switch is detected to be underwater for 1 Clogged drain pump 3 Remove drain float switch connector CN4F minute and 30 seconds continuously with...
Page 28 Check code Abnormal point and detection method Cause Countermeasure Pipe temperature 1 Slight temperature difference 1–4 Check pipe <liquid or condenser/ <Cooling mode> between indoor room evaporator> temperature with room Detected as abnormal when the pipe tem- temperature and pipe <liquid temperature display on remote con- perature is not in the cooling range 3 min- or condenser/evaporator>...
Page 29 Check code Abnormal point and detection method Cause Countermeasure Forced compressor stop 1 Drain pump trouble 1 Check the drain pump. 2 Drain defective 2 Check whether water can be drained. (due to water leakage abnormality) • Drain pump clogging 1 The unit has a water leakage abnormality •...
Page 30 Check code Abnormal point and detection method Cause Countermeasure Indoor/outdoor unit communication 1 Contact failure, short circuit or, Check LED display on the outdoor control error (Signal receiving error) circuit board. (Connect A-control service miswiring (converse wiring) of 1 Abnormal if indoor controller board tool, PAC-SK52ST.) indoor/outdoor unit connecting cannot receive any signal normally for 6...
Page 31 9-4. TROUBLESHOOTING BY INFERIOR PHENOMENA Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena Cause Countermeasure (1)Upward/downward vane 1 The vane is not downward during defrost- 1 Normal operation (The vane is set to hori- performance failure ing and heat preparation and when the zontal regardless of remote control.)
Page 32 9-5. EMERGENCY OPERATION 9-5-1. When IR wireless remote controller troubles or its battery is exhausted When the remote controller cannot be used When the batteries of the remote controller run out or the remote control- ler malfunctions, the emergency operation can be done using the emer- gency buttons on the grille.
Page 33 9-6. HOW TO CHECK THE PARTS PLA-A12EA7R1.TH PLA-A18EA7R1.TH PLA-A24EA7R1.TH PLA-A30EA7R1.TH PLA-A36EA7R1.TH PLA-A42EA7R1.TH Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. thermistor (TH1) (At the ambient temperature of 50 to 86˚F [10 to 30˚C]) Pipe temperature Normal Abnormal...
Page 34 9-6-1. Thermistor <Thermistor characteristic graph> <Thermistor for lower temperature> Room temperature thermistor(TH1) Thermistor for Pipe temperature thermistor/liquid(TH2) lower temperature Condenser/evaporator temperature thermistor(TH5) Thermistor R =15 k" ± 3% Fixed number of B=3480 ± 2% t(:)Rt=15exp { 3480( 273+t T(˚F)Rt=15exp { 3480( T-32 273+ 32˚F...
Page 35 9-7. TEST POINT DIAGRAM Indoor controller board PLA-A12EA7R1.TH PLA-A18EA7R1.TH PLA-A24EA7R1.TH PLA-A30EA7R1.TH PLA-A36EA7R1.TH PLA-A42EA7R1.TH LED2 CN90 CN4Z Power supply Connect to the wireless i-see Sensor (Sensor) (Wired remote controller) remote controller board (CNB) Connect to wired remote controller Vane motor (MV) 10.4-14.6 V DC 12 V pulse output CN5Y...
Page 36 9-8. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the DIP switch and the jumper wire on indoor controller board. PLA-A12EA7R1.TH PLA-A18EA7R1.TH PLA-A24EA7R1.TH PLA-A30EA7R1.TH PLA-A36EA7R1.TH PLA-A42EA7R1.TH ■ The black square ( ) indicates a switch position. Jumper wire ( : Short : Open)
Page 37: Function Setting
FUNCTION SETTING 10-1. UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER Each function can be set as necessary using the remote controller. The setting of function for each unit can only be done by the remote controller. (1) Functions available when setting the unit number to 00 Refer to the service manual that comes with each outdoor unit.
Page 38: Special Function
SPECIAL FUNCTION 11-1. ROTATION FUNCTION (AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION) 11-1-1. Operation (1) Rotation function (and Back-up function) Outline of functions • Main and sub unit operate alternately according to the interval of rotation setting. Note: Main and sub unit should be set by refrigerant address. (Outdoor DIP switch setting) Refrigerant address "00"...
Page 39 • System constraint · This function is available only in cooling mode. Ex.) Set temp. by R/C = 68°F [20:] [2nd stage cut-in function]··· Request code number "322–324" Set point = 79°F [26:] When request code number is “323”. Room temp. ] Set point Room temp.
Page 40 (2) How to send a request code Press the [ ] button. Main Main menu Select "Service" with the and press the [SELECT] button. Service RETURN SELECT MENU HOLD Enter the current maintenance password (4 numerical digits). • Move cursor to the digit you want to change with the button.
Page 41 11-2. BACK-UP HEATING FUNCTION 11-2-1. Operation The back-up heater turns ON when both of the following conditions have been satisfied: A) When the room temperature has not risen after the heater ON delay time has passed. Note: The heater ON delay time starts when the condition of “set temperature − room temperature > 1°F [0.5:]” has been satisfied. B) Set temperature −...
Page 42: Disassembly Procedure
DISASSEMBLY PROCEDURE PLA-A12EA7R1.TH PLA-A18EA7R1.TH PLA-A24EA7R1.TH PLA-A30EA7R1.TH PLA-A36EA7R1.TH PLA-A42EA7R1.TH 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. (See Figure 1.) Grille (2) Pull down the lever of the air intake grille to remove the filter.
Page 43 OPERATING PROCEDURE PHOTOS/FIGURES Photo 3 4. Removing the room temperature thermistor (TH1) (1) Remove the electrical box cover. (See Photo 1 and 2.) Thermistor (TH1) (2) Disconnect the connector CN20 (Red) from the indoor Electrical box controller board. Indoor controller CN20 (3) Remove the room temperature thermistor with its holder.
Page 44 Be careful when removing heavy parts. OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the electrical box Photo 6 Bell mouth fixing screws (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 screws).
Page 45 OPERATING PROCEDURE PHOTOS/FIGURES Nuts and washers Photo 10 8. Removing the fan motor (MF) Rubber mounts (1) Remove the turbo fan. (See Photo 7 and refer to procedure 8.) (2) Remove the lead cover (tapping screw 4×10: 2 screws). (See Photo 10.) (3) Loosen the 2 clamps.
Page 46 OPERATING PROCEDURE PHOTOS/FIGURES Photo 13 10. Removing the drain pan (1) Remove the electrical box. (See photo 3 and refer to 7.) 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 47 OPERATING PROCEDURE PHOTOS/FIGURES 12. Removing the drain pump (DP) Photo 15 (1) Remove the drain pan. (Refer to procedure 10) (2) Cut the hose band and remove the hose. Float switch (3) Loosen the clamp of the drain pump. Drain pump (4) Remove the drain pump (tapping screw 4×10: 2 screws/2 hooks).
Page 48 OPERATING PROCEDURE PHOTOS/FIGURES Photo 17 14. Removing the heat exchanger (1) Remove the drain pan. (Refer to procedure 10.) Coil support fixing screw (2) Remove the piping cover (tapping screw 4×10: 3 Heat exchanger fixing screws screws). (3) Remove the coil plate (tapping screw 4×10: 2 screws). Coil support (4) Remove the heat exchanger fixing screws (tapping screw 4×10: 2 screws).
Page 49 TCH070A.indd 49 TCH070A.indd 49 7/2/2565 16:46:56 7/2/2565 16:46:56...
Page 50 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 : Feb. 2022 No. TCH070 REVISED EDITION-A Published: Oct. 2021. No. TCH070 Specifications are subject to change without notice.

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Mitsubishi Electric Mr. SLIM PLA Series Service Manual

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