Mitsubishi Electric PKA-AL12NL-U1 Service Manual
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Mitsubishi Electric PKA-AL12NL-U1 Service Manual

Mitsubishi Electric PKA-AL12NL-U1 Service Manual

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SPLIT-SYSTEM HEAT PUMP
SERVICE MANUAL
Indoor unit
[Model Name]
PKA-AL12NL
PKA-AL18NL
INDOOR UNIT
WIRELESS REMOTE
CONTROLLER
(Option)
[Service Ref.]
PKA-AL12NL-U1
PKA-AL18NL-U1
ON
RETURN SELECT
MENU
HOLD
OFF
WIRED REMOTE CONTROLLER
(Option)
R454B
CONTENTS
1. REFERENCE MANUAL ······················ 2
2. SAFETY PRECAUTION ······················ 2
4. SPECIFICATIONS ······························ 9
5. NOISE CRITERION CURVES ············· 10
6. OUTLINES AND DIMENSIONS ·········· 11
7. WIRING DIAGRAM ·························· 12
9. TROUBLESHOOTING ······················ 14
10. FUNCTION SETTING ······················· 29
11. SPECIAL FUNCTION ······················· 30
12. DISASSEMBLY PROCEDURE ··········· 32
13. REMOTE CONTROLLER ·················· 36
PARTS CATALOG (OCB858)
July 2024
No. OCH858

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Summary of Contents for Mitsubishi Electric PKA-AL12NL-U1

  • Page 1: Table Of Contents

    SPLIT-SYSTEM HEAT PUMP July 2024 No. OCH858 SERVICE MANUAL R454B Indoor unit [Model Name] [Service Ref.] PKA-AL12NL-U1 PKA-AL12NL PKA-AL18NL-U1 PKA-AL18NL CONTENTS 1. REFERENCE MANUAL ······················ 2 2. SAFETY PRECAUTION ······················ 2 3. PARTS NAMES AND FUNCTIONS ······· 8 4. SPECIFICATIONS ······························ 9 5.

  • Page 2: Reference Manual

    REFERENCE MANUAL OUTDOOR UNIT’S SERVICE MANUAL Model name Service Ref. Service manual No./Parts catalog No. PUZ-AK12/18NL PUZ-AK12/18NL-U1 OCH871 / OCB871 PUY-AK12/18NL PUY-AK12/18NL-U1 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 3 2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilizing refrigerant R454B 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 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: Specifications

    SPECIFICATIONS Service Ref. PKA-AL12NL-U1 Mode Cooling Heating Power supply (phase, voltage, cycle) 1-phase, 208/230 V, 60 Hz 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 (in.) 898 (35-11/32) mm (in.)

  • Page 10: 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 11: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: in. (mm) OCH858...

  • Page 12: Wiring Diagram

    WIRING DIAGRAM OCH858...

  • Page 13: 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) OCH858...

  • Page 14: 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 15 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 16 • 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. ●...
  • Page 17 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 18 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 19 Abnormal point and detection method Countermeasure Check code Cause Pipe temperature thermistor/ – Check resistance value of thermistor. Condenser-Evaporator (TH5) 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 20 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 21 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 22 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 23 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 24: 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 controller malfunctions, the emergency operation can be done using the emergency buttons on the grille.

  • Page 25: How To Check The Parts

    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 26: Test Point

    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. (It causes trouble of the indoor controller circuit board and fan motor.) Self check Symptom: The indoor fan cannot rotate.

  • Page 27: Test Point Diagram

    9-7. TEST POINT DIAGRAM Indoor controller board CNP Drain pump output CN2L – : 13 VDC Connector (option) (LOSSNAY) CNMF LED1: Power Connect to the supply (I.B) fan motor (MF) – : 294-325 VDC – : 15 VDC – : 0–6.5 VDC CN105 IT Terminal CN01...
  • Page 28 9-8. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the DIP switch and the jumper wire on the indoor controller board. ■ The black square ( ) indicates a switch position. Switch Functions Setting by the DIP switch and jumper wire Remarks Jumper wire MODELS...

  • Page 29: 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 30: 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 31 • System constraint · This function is available only in cooling mode. [2nd stage cut-in function]··· Request code number "322–324" 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 32: Disassembly Procedure

    DISASSEMBLY PROCEDURE NOTE: Turn OFF the power supply before disassembly. Be careful when removing heavy parts. 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 slide the VANE LOWER shaft (2 places each).
  • Page 33 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 34 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 35: Removing The Heat Exchanger

    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 36: 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 37: 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 38: 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 39 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 40 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 41 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 42: 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 43: 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 se- Error information rial 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 Refrigerant leak info Main menu: RETURN...

  • Page 45: 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 46: 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 47 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 48 13-5. FUNCTION SETTING 13-5-1. PAR-42MAAUB Settings menu 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 49 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 50: 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 51: 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 52 13-7-2. PAR-SL101A-E 1. Press the button 1 to stop the air conditioner. is on), press the button 3 is off). to disable it ( 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

    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 54 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 55: 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 56 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2024 MITSUBISHI ELECTRIC CORPORATION Published: Jul. 2024 No.OCH858 Specifications are subject to change without notice. Made in Japan...

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