Mitsubishi Electric PCA-AK24NL Service Manual
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Mitsubishi Electric PCA-AK24NL Service Manual

Mitsubishi Electric PCA-AK24NL Service Manual

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SPLIT-SYSTEM HEAT PUMP
SERVICE MANUAL
Indoor unit
[Model Name]
PCA-AK24NL
PCA-AK30NL
PCA-AK36NL
PCA-AK42NL
INDOOR UNIT
ON
RETURN SELECT
MENU
HOLD
OFF
WIRED REMOTE
CONTROLLER
(Option)
[Service Ref.]
PCA-AK24NL-U1
PCA-AK30NL-U1
PCA-AK36NL-U1
PCA-AK42NL-U1
Model name
indication
WIRELESS REMOTE
CONTROLLER (Option)
R454B
CONTENTS
1. REFERENCE MANUAL ................................... 2
2. SAFETY PRECAUTION ................................... 3
3. PARTS NAMES AND FUNCTIONS ................. 9
4. SPECIFICATIONS ........................................... 10
5. NOISE CRITERION CURVES ......................... 12
6. OUTLINES AND DIMENSIONS ...................... 13
7. WIRING DIAGRAM ......................................... 15
9. TROUBLESHOOTING ................................... 17
10. FUNCTION SETTING ..................................... 31
11. SPECIAL FUNCTION ..................................... 32
12. DISASSEMBLY PROCEDURE ....................... 35
13. REMOTE CONTROLLER ............................... 41
PARTS CATALOG (OCB860)
July 2024
No. OCH860

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  • Page 1: Table Of Contents

    SPLIT-SYSTEM HEAT PUMP July 2024 No. OCH860 SERVICE MANUAL R454B Indoor unit [Model Name] [Service Ref.] PCA-AK24NL-U1 PCA-AK24NL PCA-AK30NL-U1 PCA-AK30NL PCA-AK36NL-U1 PCA-AK36NL PCA-AK42NL-U1 PCA-AK42NL CONTENTS 1. REFERENCE MANUAL ........2 2. SAFETY PRECAUTION ........3 3. PARTS NAMES AND FUNCTIONS ....9 4.

  • Page 2: Reference Manual

    REFERENCE MANUAL OUTDOOR UNIT SERVICE MANUAL Model Name Service Ref. Service Manual No. / Parts catalog No. PUZ-AH24/30NL PUZ-AH24/30NL-U1 OCH871/OCB871 PUY-AH24/30NL PUY-AH24/30NL-U1 PUZ-AK36/42NL PUZ-AK36/42NL-U1 OCH869/OCB869 PUY-AK36/42NL PUY-AK36/42NL-U1 PUZ-AK24/30/36/42NLHZ PUZ-AK24/30/36/42NLHZ-U1 OCH870/OCB870 Remote controller (Optional parts) Wired remote controller Wireless remote controller RETURN SELECT MENU HOLD...

  • Page 3: Safety Precaution

    SAFETY PRECAUTION MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT WARNING This unit uses a flammable refrigerant. If the refrigerant leaks and comes in contact with fire or a heating part, it will create a harmful gas and there is a risk of fire. Read the OPERATION MANUAL carefully before operation.

  • Page 4: 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 5 [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 to 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 6 (3) Repair to intrinsically safe components Intrinsically safe components must be replaced. (4) Cabling Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges or any other adverse environmental effects. The check shall also take into account the effects of aging or continual vibration from sources such as compressors or fans.
  • Page 7 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 8: Service Tools

    Unit Electronic weighing scale [5] Service tools Use the below service tools as exclusive tools for R454B refrigerant. Tool name Specifications · Only for R454B · Use the existing fitting specifications . (UNF1/2) Gauge manifold · Use high-tension side pressure of 768.7 PSIG [5.3 MPa.G] or over. ·...

  • Page 9: Parts Names And Functions

    PARTS NAMES AND FUNCTIONS Louver Air outlet Vane Filter (Inside of Air intake) Air intake OCH860...

  • Page 10: Specifications

    SPECIFICATIONS Service Ref. PCA-AK24NL-U1 Power supply (phase, cycle, voltage) 1-phase, 60 Hz, 208/230 V Max. Fuse Size Min.Circuit Ampacity External finish White Munsell 6.4Y 8.9/0.4 Heat exchanger Plate fin coil Fan (drive) × No. Sirocco fan (direct) × 3 Fan motor output 0.095...
  • Page 11 Service Ref. PCA-AK42NL-U1 Power supply (phase, cycle, voltage) 1-phase, 60 Hz, 208/230 V Max. Fuse Size Min.Circuit Ampacity External finish White Munsell 6.4Y 8.9/0.4 Heat exchanger Plate fin coil Fan (drive) × No. Sirocco fan (direct) × 4 Fan motor output 0.160 F.L.A Fan motor...

  • Page 12: Noise Criterion Curves

    NOISE CRITERION CURVES PCA-AK24NL-U1 PCA-AK30NL-U1 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 NC-20 HEARING FOR NC-20 CONTINUOUS...

  • Page 13: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PCA-AK24NL-U1 PCA-AK30NL-U1 Unit: mm (in.) OCH860...
  • Page 14 PCA-AK36NL-U1 PCA-AK42NL-U1 Unit: mm (in.) OCH860...

  • Page 15: Wiring Diagram

    WIRING DIAGRAM <Fig. 1> Caution when connecting the remote controller to the terminal block TB5 Do not connect 208/230V power supply cable. Be sure to connect the remote controller cable (0.3mm , AWG22) to the location shown in the figure. Be sure to connect VVF cables Refer to Table 1 TO OUTDOOR...

  • Page 16: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM Strainer 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 Room temperature (TH2) thermistor (TH1) Strainer Distributor with strainer 1/2 #50/#50 OCH860...

  • Page 17: 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 18 [Output pattern A] Errors detected by indoor unit Wired remote Wireless remote controller controller Symptom Remark Beeper sounds/OPERATION INDICATOR lamp blinks Check code (Number of times) Intake sensor error P2, P9 Pipe (liquid or 2-phase pipe) sensor error E6, E7 Indoor/outdoor unit communication error Float switch connector open Drain pump error...
  • Page 19 • On wireless remote controller The continuous buzzer sounds from receiving section of indoor unit. Blink of operation lamp • On wired remote controller Check code displayed in the LCD. *The check code in the parenthesis indicates PAR-42MAAUB model. ● If the unit cannot be operated properly after test run, refer to the following table to find the cause. Symptom Cause Wired remote controller...
  • Page 20 Note: 9-3. SELF-DIAGNOSIS ACTION TABLE Errors to be detected in outdoor unit, such as codes starting with F, U or E (excluding E0 to E7), 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 21 Check code Abnormal point and detection method Cause Countermeasure Freezing/overheating protection is (Cooling or drying mode) (Cooling or drying mode) working Clogged filter (reduced airflow) Check clogs of the filter. Freezing protection (Cooling mode) Short cycle of air path Remove shields. The unit is in 6-minute resume Low-load (low temperature) prevention mode if pipe <liquid or...
  • Page 22 Check code Abnormal point and detection method Cause Countermeasure Condenser/evaporator temperature Defective thermistor – Check resistance value of thermistor. thermistor (TH5) characteristics For characteristics, refer to (P1) above. The unit is in 3-minute resume protection Contact failure of connector Check contact failure of connector (CN44) mode if short/open of thermistor is (CN44) on the indoor controller on the indoor controller board.
  • Page 23 Check code Abnormal point and detection method Cause Countermeasure Remote controller transmission 2 remote controllers are set as Set a remote controller to main, and the error(E3)/signal receiving error(E5) “main.” other to sub. Abnormal if remote controller could not (In case of 2 remote con- find blank of transmission path for 6 trollers) seconds and could not transmit.
  • Page 24 9-4. TROUBLESHOOTING OF PROBLEMS Note: Refer to the outdoor unit's service manual for the detail of remote controller. Phenomena Cause Countermeasure (1) LED2 on indoor controller board • When LED1 on indoor controller board is also off. is off. Power supply of rated voltage is not supplied to out- Check the voltage of outdoor power door unit.
  • Page 25 Note: Refer to the outdoor unit's service manual for the detail of remote controller. Phenomena Cause Countermeasure (3) Upward/downward vane The vane is not downward during defrosting and heat Normal operation (The vane is set to hori- performance failure preparation and when the thermostat is OFF in HEAT zontal regardless of remote control.) mode.

  • Page 26: Emergency Operation

    9-5. EMERGENCY OPERATION 9-5-1. When wireless remote controller fails 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 27 9-6. HOW TO CHECK THE PARTS Parts name Checkpoints Room temperature Disconnect the connector then measure the resistance with a multimeter. thermistor (TH1) (At the ambient temperature 10 to 30˚C [50 to 86˚F] ) Pipe temperature thermistor/liquid (TH2) Normal Abnormal Condenser/evaporator (Refer to “9-6-1.
  • Page 28 9-6-1. Thermistor <Thermistor characteristic graph> <Thermistor for lower temperature> Room temperature thermistor (TH1) Thermistors for Pipe temperature thermistor/liquid (TH2) lower temperature Condenser/evaporator temperature thermistor (TH5) Thermistor R =15 kΩ ± 3% Fixed number of B =3480 ± 2% t(°C) ... R (kΩ) = R exp{B ( 273+t...

  • Page 29: Test Point Diagram

    9-7. TEST POINT DIAGRAM Indoor controller board LED3 Transmission (Indoor/outdoor) Vane motor output (MV) 12 V pulse output CN2L CN90 Connector to the wireless Connector (LOSSNAY) remote controller board (CNB) Model selection CN4Y i-see Sensor (option) Capacity setting CN6Y i-see Sensor motor (option) Jumper wire J41,J42 Pair No.
  • Page 30 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. ■ The black square ( ) indicates a switch position. Switch Functions Setting by the DIP switch and jumper wire Remarks Jumper wire For service board...

  • Page 31: 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 32: Special Function

    SPECIAL FUNCTION 11-1. ROTATION FUNCTION (AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION) Note that this function is not available for SUZ, MXZ, and PUMY models. 11-1-1. Operation (1) Rotation function (and Back-up function) • Outline of functions · Main and sub units operate according to the interval of rotation setting. Main and sub units should be set by refrigerant address.
  • Page 33 • System constraint · This function is available only in cool mode. [2nd stage cut-in function] Ex.) Set temp. by R/C = 20°C [68°F] Set point = 26°C [79°F] Room temp. ≥ Set point Room temp. < Set point −4°C [-8°F] When request code number is “323”.
  • Page 34 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 heater ON delay time has passed and the room temperature, which is measured every minute, has not increased three times in a row compared with the temperature before the heater ON delay time started.

  • Page 35: Disassembly Procedure

    DISASSEMBLY PROCEDURE NOTE:Turn OFF the power supply before disassembly. Be careful when removing heavy parts. : Indicates the visible parts in the photos/figures. 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 (TH1) Photo 3 (1) Remove the air intake grille. (See Figure 1, 2) Casing (2) Remove the beam by removing 1 screw (4 8 PT) (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) Photo 8 (1) Remove the air intake grille. (See Figure 1, 2) (2) Remove the beam by removing 1 screw (4 8 PT) (See × Photo 1) (3) Remove 2 screws from the electrical cover, and remove the electrical cover.
  • Page 38 OPERATING PROCEDURE PHOTOS/FIGURES Photo 11 7. Removing the vane motor (1) Remove the air intake. (See Figure 1, 2) Connector Vane motor and cover (2) Remove the right side panel. (See Figure 4, 5) (3) Remove the connector of vane motor. (4) Remove 2 screws of vane motor cover, then remove vane motor.
  • Page 39 OPERATING PROCEDURE PHOTOS/FIGURES Photo 16 10. Removing the pipe temperature thermistor/liquid (TH2) and the condenser/evaporator temperature thermistor (TH5) (1) Remove the air intake grille. (See Figure 1, 2) (2) Remove the left and right side panels. (See Figure 4, 5) (3) Remove the under panel.
  • Page 40 OPERATING PROCEDURE PHOTOS/FIGURES Photo 20 13. Removing the heat exchanger (1) Remove the air intake grille. (See Figure 1, 2) (2) Remove the left and right side panels. (See Figure 4, 5) (3) Remove the under panel. (See Photo 12) (4) Remove the drain pan.

  • Page 41: Remote Controller

    REMOTE CONTROLLER 13-1. 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: 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 43: Operation

    Menu structure Main menu Press the button. MENU Move the cursor to the desired item with the buttons, and press the button. SELECT/HOLD Operation Vane · 3D i-See · Vent. (Lossnay) High power Comfort Manual vane angle 3D i-see Sensor Timer menu Timer ON/OFF timer...
  • Page 44 Continue from the previous page. Maintenance menu Error information Filter information Cleaning Auto descending panel Descending operation Descending adjustment Refrigerant leak info Service menu Test run menu Test run Drain pump test run RC alarm test Maintenance information Collect model names and serial No. Model name input Serial No.

  • Page 45: 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. (Lossnay) Louver: Use to set the horizontal air direction. Vane · Louver · Vent. 3D i-See sensor: This setting is available only for the air (Lossnay) conditioners that support easy setting function of motion sensing air direction.
  • Page 46 Setting and display Main menu Setting details items Initial Display Main display Use to switch between "Full" and "Basic" modes for the Main display, and use setting setting to change the background colors of the display to black. Display de- Make the settings for the remote controller related items as necessary.

  • Page 47: 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 48: Error Information

    13-2. 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 serial Error information number will appear. Error code The model name and serial number will appear only if the information Error unit Unit#1...
  • Page 49 • 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 Refrigerant leak info Main menu: RETURN...

  • Page 50: Service Menu

    13-3. 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 51: Test Run Operation

    13-4. TEST RUN 13-4-1. 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 52 13-4-2. 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 53 13-5. FUNCTION SETTING Settings menu 13-5-1. PAR-42MAAUB Function setting 1. Select "Service" from the Main menu, and press the [SELECT/HOLD] button. Rotation setting RC operation setting CN24 settings Select "Setting" from the Service menu, and press the [SELECT/HOLD] button. Service menu: MENU Select "Function setting", and press the [SELECT/HOLD] button.
  • Page 54 13-5-2. 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. 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 55: Error History

    13-6. 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: Self-Diagnosis

    13-7. SELF-DIAGNOSIS 13-7-1. PAR-42MAAUB 1. Select "Service" from the Main menu, Diagnosis and press the [SELECT/HOLD] button. Self check Remote controller check Select "Check" from the Service menu, and press the [SELECT/HOLD] button. Service menu: MENU Cursor Select "Diagnosis" from the Check menu, and press the [SELECT/HOLD] button.
  • Page 57 13-7-2. 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 58: Remote Controller Check

    13-8. 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 59 13-9. SMOOTH MAINTENANCE Check menu 1. Select "Service" from the Main menu, and press the [SELECT/HOLD] button. Error history Diagnosis Smooth maintenance Request code Select "Check" with the F1 or F2 button, and press the [SELECT/HOLD] button. Service menu: MENU Cursor Select "Smooth maintenance"...

  • Page 60: Request Code

    ■ Refrigerant address Single refrigerant system Multi refrigerant system (group control) In the case of single refrigerant system, the refrigerant address Up to 16 refrigerant systems (16 outdoor units) can be con- is "00" and no operation is required. nected as a group by 1 remote controller. To check or set the Simultaneous twin, triple units belong to this category refrigerant addresses.
  • Page 61 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2024 MITSUBISHI ELECTRIC CORPORATION Published: Jul. 2024 No.OCH860 Specifications are subject to change without notice. Made in Japan...

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