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Mitsubishi Electric PKA-A12LA1 Service Manual
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Mitsubishi Electric PKA-A12LA1 Service Manual

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SPLIT-SYSTEM HEAT PUMP
SERVICE MANUAL
Indoor unit
[Model Name]
PKA-A12LA1
PKA-A18LA1
INDOOR UNIT
WIRELESS REMOTE
CONTROLLER
(Option)
[Service Ref.]
PKA-A12LA1
PKA-A18LA1
ON
RETURN SELECT
MENU
HOLD
OFF
WIRED REMOTE CONTROLLER
(Option)
CONTENTS
1. REFERENCE MANUAL ······················ 2
2. SAFETY PRECAUTION ······················ 2
4. SPECIFICATIONS ······························ 6
5. NOISE CRITERION CURVES ··············· 7
6. OUTLINES AND DIMENSIONS ············ 8
7. WIRING DIAGRAM ···························· 9
9. TROUBLESHOOTING ······················ 11
10. FUNCTION SETTING ······················· 26
11. SPECIAL FUNCTION ······················· 27
12. DISASSEMBLY PROCEDURE ··········· 30
13. REMOTE CONTROLLER ·················· 34
PARTS CATALOG (TCB117)
March 2023
No. TCH117

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Summary of Contents for Mitsubishi Electric PKA-A12LA1

  • Page 1: Table Of Contents

    SPLIT-SYSTEM HEAT PUMP March 2023 No. TCH117 SERVICE MANUAL Indoor unit [Model Name] [Service Ref.] PKA-A12LA1 PKA-A12LA1 PKA-A18LA1 PKA-A18LA1 CONTENTS 1. REFERENCE MANUAL ······················ 2 2. SAFETY PRECAUTION ······················ 2 3. PARTS NAMES AND FUNCTIONS ······· 5 4. SPECIFICATIONS ······························ 6 5.

  • Page 2: Reference Manual

    REFERENCE MANUAL OUTDOOR UNIT’S SERVICE MANUAL Model name Service Ref. Service manual No./Parts catalog No. PUZ-A12/18NKA7 PUZ-A12/18NKA7 OCH636/OCB636 PUY-A12/18NKA7 PUY-A12/18NKA7 PUZ-A12/18NKA8 PUZ-A12/18NKA8 PUZ-A24NHA8 PUZ-A24NHA8 OCH764/OCB764 PUY-A12/18NKA8 PUY-A12/18NKA8 PUY-A24NHA8 PUY-A24NHA8 PUZ-HA24NHA1 PUZ-HA24NHA1 OCH750/OCB750 PUZ-HA36NKA PUZ-HA36NKA SAFETY PRECAUTION 2-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected.
  • Page 3 Preparation before the repair service. Precautions during the repair service. • Prepare the proper tools. • Do not perform the work involving the electric parts • Prepare the proper protectors. with wet hands. • Provide adequate ventilation. • Do not pour water into the electric parts. •...
  • 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 Gauge manifold · Use the existing fitting specifications . (UNF1/2) · Use high-tension side pressure of 5.3MPa·G [768.7 PSIG] or over. Charge hose ·...

  • Page 6: Specifications

    SPECIFICATIONS Service Ref. PKA-A12LA1 Mode Cooling Heating Power supply (phase, voltage, cycle) Single phase, 208/230 V, 60Hz Input 0.06 0.03 Running current 0.55 0.30 External finish (Panel) Munsell 0.7PB 9.2/0.4 Heat exchanger Plate fin coil Dimensions mm (inch) 898 (35-23/64)

  • Page 7: Noise Criterion Curves

    NOISE CRITERION CURVES 5-1. NOISE CRITERION CURVES SPL(dB) LINE High Medium 1 Medium 2 NC-70 NC-60 NC-50 NC-40 NC-30 Approximate minimum audible limit on NC-20 continuous noise 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz Main unit Wall 1.0m [3.3 ft] Measurement location * Measured in anechoic room.

  • Page 8: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: inch (mm) TCH117...

  • Page 9: Wiring Diagram

    WIRING DIAGRAM TCH117...

  • Page 10: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM Strainer (#50) Heat exchanger Refrigerant GAS pipe connection (Flare) Thermistor TH2 Refrigerant flow in cooling (Pipe temperature/liquid) Refrigerant flow in heating Thermistor TH5 (Cond./ Eva.temperature) Refrigerant LIQUID pipe connection (Flare) Thermistor TH1 (Room temperature) Strainer (#100) Distributor with strainer (#100/#50) TCH117...

  • 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 or controller 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. * The check code in the parenthesis indicates PAR-41MAA model. ●...
  • Page 14 9-3. SELF-DIAGNOSIS ACTION TABLE Note: 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's service manual for the details. Abnormal point and detection method Countermeasure Check code...
  • Page 15 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 air- Check clogs of the filter. Freezing protection (Cooling mode) flow) Remove shields. The unit is in 6-minute resume preven- Short cycle of air path tion mode if pipe <liquid or condenser/ Low-load (low temperature)
  • Page 16 Abnormal point and detection method Countermeasure Check code Cause Pipe temperature thermistor/ Condenser-Evaporator (TH5) – Check resistance value of thermistor. Defective thermistor For characteristics, refer to (P1). The unit is in 3-minute resume protec- characteristics Check contact failure of connector (CN44) tion mode if short/open of thermistor is Contact failure of connector on the indoor controller board.
  • Page 17 Abnormal point and detection method Countermeasure Check code Cause Remote controller transmission error(E3)/signal receiving error(E5) 2 remote controllers are set as Set a remote controller to main, and the Abnormal if remote controller could not “main.” other to sub. find blank of transmission path for 6 sec- (In case of 2 remote con- onds and could not transmit.
  • Page 18 Abnormal point and detection method Countermeasure Check code Cause Forced compressor stop Drain pump trouble Check the drain pump. (due to water leakage abnormality) The unit has a water leakage abnormal- Defective drainage Check whether water can be drained. ity when the following conditions, a) ·...
  • Page 19 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 20 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 21 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 on the grille.
  • Page 22 9-6. HOW TO CHECK THE PARTS Parts name Checkpoints Room temperature Disconnect the connector then measure the resistance with a multimeter. thermistor (TH1) Pipe temperature Refer to “9-6-1. Thermistor”. thermistor/liquid(TH2) Condenser/evaporator temperature thermistor (TH5) Vane motor (Upper MV1) Measure the resistance between the terminals with a multimeter . (At the ambient temperature 25°C [77°F]) Sky Blue Normal...
  • Page 23 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 connector (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. (It causes trouble of the indoor controller circuit board and fan motor.) Self check Symptom : The indoor fan cannot rotate.
  • Page 24 9-7. TEST POINT DIAGRAM Indoor controller board CNP Drain pump output CN2L 1–3: 13 VDC Connector (option) (LOSSNAY) CNMF LED1: Power Connect to the supply (I.B) fan motor (MF) 1–4 : 294-325 VDC 5–4 : 15 V DC 6–4 : 0–6.5 VDC CN105 7–4 : 0 or 15 VDC IT Terminal...
  • Page 25 MODELS SETTING Model 1 2 3 4 5 6 PKA-A ・ LA1 settings MODELS SETTING 1 2 3 4 5 PKA-A12LA1 Capacity settings 1 2 3 4 5 PKA-A18LA1 <Initial setting> Wireless remote controller: 0 Control PCB setting Wireless remote...

  • Page 26: Function Setting

    FUNCTION SETTING 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 "Grp." Refer to the service manual that comes with each outdoor unit.

  • Page 27: Special Function

    SPECIAL FUNCTION 11-1. ROTATION FUNCTION(AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION) Connect optional wired remote controller through Terminal Block kit (PAC-SH29TC-E) to PKA type. 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. Main and sub unit should be set by refrigerant address.
  • Page 28 • System constraint · This function is available only in cooling mode. Ex.) Set temp. by R/C = 20°C [68°F] [2nd stage cut-in function]··· Request code number "322–324" Set point = 26°C [79°F] Room temp. ] Set point Room temp. < Set point -4°C [−7.2°F] When request code number is “323”.
  • Page 29 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 30: Disassembly Procedure

    DISASSEMBLY PROCEDURE NOTE: Turn OFF the power supply before assembly. Be careful when removing heavy parts. : Indicates the visible parts in the photos/figures. OPERATION PROCEDURE PHOTOS/FIGURES 1. REMOVING THE PANEL Photo 1 VANE UPPER shaft VANE UPPER Front panel (1) Insert the driver to the hole at VANE LOWER shaft and VANE LOWER VANE LOWER shaft...
  • Page 31 OPERATION PROCEDURE PHOTOS/FIGURES 3. REMOVING THE INDOOR CONTROLLER BOARD, Photo 4 THE WIRELESS REMOTE CONTROLLER BOARD Holder of wireless remote AND THE LED BOARD Switch board holder controller board and LED board (Holder of switch board) (1) Remove the panel and the corner box. (Refer to procedure 1) (2) Remove the front and side electrical box covers (each 2 screw).
  • Page 32 OPERATION PROCEDURE PHOTOS/FIGURES Photo 8 6. REMOVING THE INDOOR FAN MOTOR AND THE LINE FLOW FAN Lead wire of pipe thermistor (1) Remove the panel and the corner box. (Refer to procedure 1) Motor band (2) Remove the electrical box (Refer to procedure 2) and the nozzle assembly (Refer to procedure 4).
  • Page 33 OPERATION PROCEDURE PHOTOS/FIGURES 8. REMOVING THE HEAT EXCHANGER 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 34: 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 35 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 36 Menu structure Main menu Press the button. 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 37 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 38 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 39 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 40 <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 41 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 42 • 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 43 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 maintenance setting. Service 2. When the Service menu is selected, a window will appear asking for the pass- Service menu word.
  • Page 44 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 45 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 46 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 47 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 48 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 49 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 50 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 51 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 52 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 53 ■ 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 Published: Mar. 2023 No. TCH117 Made in Thailand Specifications are subject to change without notice.

This manual is also suitable for:

Pka seriesPka-a18la1

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