Mitsubishi Electric PKA-A24KA8 Service Manual
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Mitsubishi Electric PKA-A24KA8 Service Manual

Mitsubishi Electric PKA-A24KA8 Service Manual

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SPLIT-SYSTEM HEAT PUMP
SERVICE MANUAL
Indoor unit
[Model Name]
PKA-A24KA8
PKA-A30KA8
PKA-A36KA8
INDOOR UNIT
WIRELESS REMOTE
CONTROLLER
(Option)
[Service Ref.]
PKA-A24KA8
PKA-A30KA8
PKA-A36KA8
ON
RETURN SELECT
MENU
HOLD
OFF
WIRED REMOTE
CONTROLLER
(Option)
REVISED EDITION-A
Revision:
• Some descriptions have been
revised in REVISED EDITION-A
TCH115 is void.
CONTENTS
1. REFERENCE MANUAL ................................... 2
2. SAFETY PRECAUTION ................................... 3
3. PARTS NAMES AND FUNCTIONS ................. 5
4. SPECIFICATIONS ............................................ 6
5. NOISE CRITERION CURVES .......................... 7
6. OUTLINES AND DIMENSIONS ........................ 8
7. WIRING DIAGRAM ........................................... 9
9. TROUBLESHOOTING .................................... 11
10. FUNCTION SETTING ..................................... 25
11. SPECIAL FUNCTION ..................................... 26
12. DISASSEMBLY PROCEDURE ....................... 29
13. REMOTE CONTROLLER ............................... 33
PARTS CATALOG (TCB115)
August 2023
No. TCH115

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Summary of Contents for Mitsubishi Electric PKA-A24KA8

  • Page 1: Table Of Contents

    SPLIT-SYSTEM HEAT PUMP August 2023 No. TCH115 REVISED EDITION-A SERVICE MANUAL Indoor unit Revision: [Model Name] [Service Ref.] • Some descriptions have been PKA-A24KA8 revised in REVISED EDITION-A PKA-A24KA8 TCH115 is void. PKA-A30KA8 PKA-A30KA8 PKA-A36KA8 PKA-A36KA8 CONTENTS 1. REFERENCE MANUAL ........2 2.

  • Page 2: Reference Manual

    REFERENCE MANUAL OUTDOOR UNIT SERVICE MANUAL Model Name Service Ref. Service Manual No. / PARTS CATALOG No. PUZ-A24/30NHA7 PUZ-A24/30NHA7 PUZ-A36NKA7 PUZ-A36NKA7 OCH636 / OCB636 PUY-A24/30NHA7 PUY-A24/30NHA7 PUY-A36NKA7 PUY-A36NKA7 PUZ-A24/30NHA8 PUZ-A24/30NHA8 PUZ-A36NKA8 PUZ-A36NKA8 OCH764 / OCB764 PUY-A24/30NHA8 PUY-A24/30NHA8 PUY-A36NKA8 PUY-A36NKA8 PUZ-HA30/36NKA PUZ-HA30/36NKA OCH750 / OCB750 PUZ-HA24NHA1...

  • 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 Precautions during the repair service. Preparation before the repair service. •...
  • 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: Parts Names And Functions

    Unit Electronic weighing scale [4] Service tools Use the below service tools as exclusive tools for R410A refrigerant. Tool name Specifications · Use the existing fitting specifications . (UNF1/2) Gauge manifold 768.7 PSIG [5.3 MPa.G] · Use high-tension side pressure of or over.

  • Page 6: Specifications

    SPECIFICATIONS Service Ref. PKA-A24KA8 Power supply(phase, cycle, voltage) 1 phase, 60Hz, 208/230V Max. Fuse Size Min.Circuit Ampacity External finish White Munsell 1.0Y 9.2/0.2 Heat exchanger Plate fin coil Fan(drive) × No. Line flow fan (direct) × 1 Fan motor output 0.069...

  • Page 7: Noise Criterion Curves

    NOISE CRITERION CURVES PKA-A24KA8 PKA-A36KA8 PKA-A24KA SPL(dB) LINE NOTCH NOTCH SPL(dB) LINE PKA-A30KA8 High PKA-A30KA High PKA-A24KAL PKA-A30KAL 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...

  • Page 8: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PKA-A24KA8 PKA-A30KA8 PKA-A36KA8 Unit: inch (mm) Top side 16-11/16(423.7) 17(431.7) Left side Right side Front side Mount board Knockout hole for left piping 9-1/2(241) 2-29/32(74) 33-21/32(855) 3/16(5) 11-5/8(295) 46-1/16(1170) Operation lamp Front side(Grille open) Knockout hole for right piping...

  • Page 9: Wiring Diagram

    WIRING DIAGRAM PKA-A24KA8 PKA-A30KA8 PKA-A36KA8 OUTDOOR UNIT TCH115A...

  • Page 10: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PKA-A24KA8 PKA-A30KA8 PKA-A36KA8 Strainer (#50) Heat exchanger Refrigerant GAS pipe connection (Flare) Refrigerant flow in cooling Pipe temperature thermistor/liquid Refrigerant flow in heating (TH2) Condenser/evaporator temperature thermistor Refrigerant LIQUID pipe connection (TH5) (Flare) Room temperature thermistor (TH1)

  • Page 11: 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 12 9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER • Refer to “13-7. SELF-DIAGNOSIS” to search for the error history. [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...
  • Page 13 • 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. (Refer to the previous page, 1 check code.) ● 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 14 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 15 Check code Abnormal point and detection method Cause Countermeasure Freezing/overheating protection is work- (Cooling or drying mode) (Cooling or drying mode) 1 Clogged filter (reduced airflow) 1 Check clogs of the filter. 1 Freezing protection (Cooling mode) 2 Short cycle of air path 2 Remove shields.
  • Page 16 Check code Abnormal point and detection method Cause Countermeasure Condenser/evaporator temperature ther- 1 Defective thermistor 1–3 Check resistance value of thermistor. For characteristics, refer to (P1) above. mistor (TH5) characteristics 2 Check contact failure of connector (CN44) 1 The unit is in 3-minute resume protec- 2 Contact failure of connector on the indoor controller board.
  • Page 17 Check code Abnormal point and detection method Cause Countermeasure Remote controller transmission 1 2 remote controllers are set as 1 Set a remote controller to main, and the error(E3)/signal receiving error(E5) “main.” other to sub. 1 Abnormal if remote controller could not (In case of 2 remote con- find blank of transmission path for 6 sec- trollers)
  • Page 18 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 19 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 20 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 controller malfunctions, the emergency operation can be done using the emergency buttons.
  • Page 21 9-6. HOW TO CHECK THE PARTS PKA-A24KA8 PKA-A30KA8 PKA-A36KA8 Parts name Check points Room temperature Disconnect the connector then measure the resistance using a tester. thermistor (TH1) (At the ambient temperature 50 to 86˚F [10 to 30˚C] Pipe temperature Normal...
  • Page 22 9-6-2. 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 23 9-7. TEST POINT DIAGRAM Indoor controller board PKA-A24KA8 PKA-A30KA8 PKA-A36KA8 CN2L CNP Drain pump output Connector 1-3: 13 VDC CNMF (LOSSNAY) (option) Connect to the fan motor (MF) 1–3 : 294–325 V DC 4–3 : 15 V DC 5–3 : 0–6.5 V DC LED1: Power 6–3 : 0 V or 15 V DC...
  • Page 24 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. PKA-A24KA8 PKA-A30KA8 PKA-A36KA8 ■ The black square ( ) indicates a switch position. Jumper wire Setting by the DIP switch and jumper wire...

  • Page 25: 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 26: Special Function

    SPECIAL FUNCTION 11-1. Rotation Function (and back-up function, 2nd stage cut-in function) This function is only available when using wired remote controller. 11-1-1. Operation (1) Rotation function (and Back-up function) Outline of functions • Main and sub units operate alternately according to the interval of rotation setting. Note: Main and sub unit should be set by refrigerant address.
  • Page 27 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 28 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°C]” has been satisfied. B) Set temperature −...

  • Page 29: Disassembly Procedure

    DISASSEMBLY PROCEDURE PKA-A24KA8 PKA-A30KA8 PKA-A36KA8 Be careful when removing heavy parts. OPERATION PROCEDURE PHOTOS & ILLUSTRATIONS 1. Removing the panel Front grille Screws Photo 1 (1) Press and unlock the knobs on both sides of the front grille and lift the front grille until it is level. Pull the hinges for- ward to remove the front grille.
  • Page 30 OPERATION PROCEDURE PHOTOS 3. Removing the electrical box Terminal block (TB4) Photo 4 (1) Remove the panel and the corner box. (Refer to step 1) (2) Remove the front and side electrical box covers (each 1 Indoor controller screw). board (I.B.) (3) Remove the indoor / outdoor connecting wire from termi- Connector nal block (TB4).
  • Page 31 OPERATION PROCEDURE PHOTOS 6. Removing the indoor fan motor and the line flow fan Photo 7 Screw of the motor band (1) Remove the panel and the corner box. (Refer to step 1) (2) Remove the electrical box (Refer to step 2) and the nozzle Lead wire of pipe thermistor assembly (Refer to step 3).
  • Page 32 OPERATION PROCEDURE PHOTOS 8. Removing the heat exchanger Photo 11 Heat exchanger Water cut (1) Remove the panel and the corner box. (Refer to step 1) (2) Remove the electrical box (Refer to step 3) and the nozzle assembly (Refer to step 4). (3) Remove the water cut.

  • Page 33: Remote Controller

    REMOTE CONTROLLER 13-1. 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 34 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 35 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 · Louver · Vent. (Lossnay) High power Comfort Manual vane angle 3D i-See sensor Timer menu Timer ON/OFF timer Auto-OFF timer...
  • Page 36 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 37 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. Use to turn ON/OFF the louver. • Select a desired setting from "ON" and "OFF." Use to set the amount of ventilation.
  • Page 38 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 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 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 se- Error information rial number will appear. Error code The model name and serial number will appear only if the informa- Error unit...
  • Page 41 • 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 42 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 43 13-4. TEST RUN 13-4-1. 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 44 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 45 13-5. FUNCTION SETTING 13-5-1. PAR-41MAA Settings menu Function setting 1. Select "Service" from the Main menu, and press the [SELECT/HOLD] button. Select "Setting" from the Service menu, and press the [SELECT/HOLD] button. Service menu: MENU Select "Function setting", and press the [SELECT/HOLD] button. SELECT MENU RETURN...
  • Page 46 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 47 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 48 13-7. SELF-DIAGNOSIS 13-7-1. PAR-41MAA 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 49 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 50 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 51 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 52 ■ 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 54 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: Aug. 2023. No. TCH115 REVISED EDITION-A Published: Apr. 2023 No. TCH115 Made in Thailand Specifications are subject to change without notice.

This manual is also suitable for:

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