Mitsubishi Electric PKA-A24KA6 Service Manual

Mitsubishi Electric PKA-A24KA6 Service Manual

Wall mounted r410a
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SPLIT-SYSTEM HEAT PUMP
SERVICE MANUAL
Indoor unit
[Model Name]
PKA-A24KA6
PKA-A30KA6
PKA-A36KA6
INDOOR UNIT
ON/OFF
TEMP
IR WIRELESS REMOTE
CONTROLLER
(Option)
[Service Ref.]
PKA-A24KA6.TH
PKA-A30KA6.TH
PKA-A36KA6.TH
WIRED REMOTE
CONTROLLER
(Option)
Notes:
This manual describes service
data of the indoor units only.
RoHS compliant products
have <G> mark on the spec
name plate.
CONTENTS
1. REFERENCE MANUAL ................................... 2
2. SAFETY PRECAUTION ................................... 3
3. PARTS NAMES AND FUNCTIONS ................. 4
4. SPECIFICATIONS ........................................... 10
5. NOISE CRITERION CURVES ......................... 11
6. OUTLINES AND DIMENSIONS ...................... 12
7. WIRING DIAGRAM ......................................... 13
8. REFRIGERANT SYSTEM DIAGRAM ............ 14
9. TROUBLESHOOTING .................................... 15
10. SPECIAL FUNCTION ..................................... 29
11. DISASSEMBLY PROCEDURE ....................... 32
PARTS CATALOG (OCB584)
December 2014
No. OCH584

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Summary of Contents for Mitsubishi Electric PKA-A24KA6

  • Page 1 SPLIT-SYSTEM HEAT PUMP December 2014 No. OCH584 SERVICE MANUAL Indoor unit [Model Name] [Service Ref.] PKA-A24KA6.TH Notes: PKA-A24KA6 This manual describes service data of the indoor units only. PKA-A30KA6.TH RoHS compliant products PKA-A30KA6 have <G> mark on the spec name plate.
  • Page 2 REFERENCE MANUAL OUTDOOR UNIT SERVICE MANUAL Model Name Service Ref. Service Manual No. PUZ-A18/24/30/36NHA6 PUZ-A18/24/30/36NHA6 PUZ-A18/24/30/36NHA6-BS PUZ-A18/24/30/36NHA6-BS OCH577 PUY-A12/18/24/30/36NHA6 PUY-A12/18/24/30/36NHA6 OCB577 PUY-A12/18/24/30/36NHA6-BS PUY-A12/18/24/30/36NHA6-BS PUZ-HA30/36NHA2 PUZ-HA30/36NHA2 OCH426/OCB426 Remote controller (Optional parts) Radio frequency interface Wired remote controller IR wireless remote controller COOL AUTO HEAT...
  • Page 3 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 a vacuum pump with a reverse flow check Use new refrigerant pipes. valve.
  • Page 4: Indoor Unit

    [1] Cautions for service (1) Perform service after recovering the refrigerant left in 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 5 Wired remote controller (Option) 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 6 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 7 Menu structure Press the button. MENU Main menu Move the cursor to the desired item with the buttons, and press the button. SELECT Vane · Louver · Vent. (Lossnay) High power Timer On / Off timer Auto-Off timer Weekly timer Restriction Temp.
  • Page 8 Main menu list Setting and display items Setting details Vane · Louver · Vent. (Lossnay) Use to set the vane angle. Select a desired vane setting from ve different settings. Use to turn ON / OFF the louver. Select a desired setting from "ON" and "OFF." Use to set the amount of ventilation.
  • Page 9 IR wireless remote controller (Option) CHECK TEST RUN display CHECK and TEST RUN display indicate that the unit is being checked or test-run. MODEL SELECT display Blinks when model is selected. display Lights up while the signal is transmitted to the indoor unit when the button is pressed.
  • Page 10 SPECIFICATIONS Service Ref. PKA-A24KA6.TH 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) o No. Line flow fan (direct) × 1 Fan motor output 0.056...
  • Page 11 NOISE CRITERION CURVES PKA-A24KA6.TH PKA-A36KA6.TH PKA-A24KA SPL(dB) LINE NOTCH NOTCH SPL(dB) LINE High PKA-A30KA6.TH High PKA-A30KA 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 HEARING FOR NC-20 NC-20...
  • Page 12 OUTLINES AND DIMENSIONS PKA-A24KA6.TH PKA-A30KA6.TH PKA-A36KA6.TH Unit: in (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 13: Pka-A24Ka6

    WIRING DIAGRAM PKA-A24KA6.TH PKA-A30KA6.TH PKA-A36KA6.TH [Explanation of symbols] Symbol Name Symbol Name Indoor controller board Vane motor CN2L Connector (LOSSNAY) Fan motor CN30 Connector (LLC) Switch board CN32 Connector ( Remote switch) SWE2 Emergency operation CN41 Connector (HA terminal-A) Terminal block(Indoor unit Power (option))
  • Page 14 REFRIGERANT SYSTEM DIAGRAM PKA-A24KA6.TH PKA-A30KA6.TH PKA-A36KA6.TH 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)
  • Page 15 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 16 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> [Procedure] 1.
  • Page 17 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 18 On IR 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, check code.) If the unit cannot be operated properly after the test run, refer to the following table to find out the cause. Symptom Cause Wired remote controller...
  • Page 19 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. Abnormal point and detection method Countermeasure Check code...
  • Page 20 Abnormal point and detection method Countermeasure Check code Cause 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 21 Abnormal point and detection method Countermeasure Check code Cause Pipe temperature thermistor/ 1 Defective thermistor 1–3 Check resistance value of thermistor. Condenser-Evaporator (TH5) For characteristics, refer to (P1) above. characteristics 2 Check contact failure of connector (CN44) on 1 The unit is in 3-minute resume protec- 2 Contact failure of connector the indoor controller board.
  • Page 22: Indoor Unit

    Abnormal point and detection method Countermeasure Check code Cause Remote controller transmission 1 Set a remote controller to main, and the 1 2 remote controllers are set as error(E3)/signal receiving error(E5) other to sub. “main.” 1 Abnormal if remote controller could not (In case of 2 remote con- find blank of transmission path for 6 sec- trollers)
  • Page 23: Controller

    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 The vane is not downward during defrosting and heat Normal operation (The vane is set to performance failure preparation and when the thermostat is OFF in HEAT horizontal regardless of remote control.)
  • Page 24 9-5. EMERGENCY OPERATION 9-5-1. When IR 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 25: Pka-A24Ka6.Th

    9-6. HOW TO CHECK THE PARTS PKA-A24KA6.TH PKA-A30KA6H.TH PKA-A36KA6.TH 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] Liquid pipe thermistor...
  • Page 26 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 27 9-7. TEST POINT DIAGRAM Indoor controller board PKA-A24KA6.TH PKA-A30KA6.TH PKA-A36KA6.TH CNMF Connect to the fan motor (MF) 1–3 : 294–325 V DC 4–3 : 15 V DC 5–3 : 0–6.5 V DC 6–3 : 0 V or 15 V DC...
  • Page 28: Pka-A30Ka6.Th

    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-A24KA6.TH PKA-A30KA6.TH PKA-A36KA6.TH The black square ( ) indicates a switch position. Jumper wire Setting by the DIP switch and jumper wire...
  • Page 29 SPECIAL FUNCTION 10-1. Rotation Function (and back-up function, 2nd stage cut-in function) This function is only available when using wired remote controller. 10-1-1. 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 30 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 31 (2) Rotation and back up operation PAR-31MAA Press the button. Main Main menu Maintenance Initial setting Select "Service" with the [Cursor] buttons ( ) or the [Page] buttons ( Service ), and press the button. Main display: Cursor Page Enter the current maintenance password (4 numerical digits). Service menu Move cursor to the digit you wat to change with the button.
  • Page 32 DISASSEMBLY PROCEDURE PKA-A24KA6.TH PKA-A30KA6.TH PKA-A36KA6.TH 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 forward to remove the front grille.
  • Page 33 OPERATION PROCEDURE PHOTOS Terminal block (TB4) 3. REMOVING THE ELECTRICAL BOX 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 34 OPERATION PROCEDURE PHOTOS 6. REMOVING THE INDOOR FAN MOTOR AND THE Photo 7 Screw of the motor band LINE FLOW FAN (1) Remove the panel and the corner box. (Refer to step 1) Lead wire of pipe thermistor (2) Remove the electrical box (Refer to step 2) and the nozzle assembly (Refer to step 3).
  • Page 35 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 36 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2014 MITSUBISHI ELECTRIC CORPORATION New publication, effective Dec. 2014 Distributed in Dec. 2014 No. OCH584 Specifications are subject to change without notice. Made in Japan...
  • Page 37: Table Of Contents

    December 2014 No. OCB584 PARTS CATALOG Indoor unit [Model Name] [Service Ref.] Note: RoHS compliant products have <G> mark on the spec PKA-A24KA6.TH name plate. PKA-A24KA6 PKA-A30KA6.TH PKA-A30KA6 PKA-A36KA6.TH PKA-A36KA6 CONTENTS 1. RoHS PARTS LIST ............. 2 SERVICE MANUAL (OCH584)
  • Page 38 RoHS PARTS LIST PANEL AND HEAT EXCHANGER PARTS PKA-A24KA6.TH PKA-A30KA6.TH PKA-A36KA6.TH OCB584...
  • Page 39 RoHS PARTS LIST Q'ty/ unit Wiring Recom- Remarks Parts No. Parts Name Speci cation PKA-A KA6.TH Diagram mended (Drawing No.) Symbol Q'ty 24, 30 E12 C92 970 INSTALLATION PLATE E12 D20 234 BOX E17 B04 000 PANEL ASSEMBLY E12 408 142 CATCH 2 pcs/ set E12 C92 142 CATCH 2 pcs/ set...
  • Page 40: Rohs Parts List

    RoHS PARTS LIST FUNCTIONAL PARTS PKA-A24KA6.TH PKA-A30KA6.TH PKA-A36KA6.TH OCB584...
  • Page 41 RoHS PARTS LIST Part numbers that are circled are not shown in the illustration. Q'ty/ unit Wiring Recom- Remarks Part No. Part Name Speci cation Diagram mended PKA-A24, 30, 36 (Drawing No.) Symbol Q'ty KA6.TH G E12 C92 302 LINE FLOW FAN G E12 751 509 BEARING MOUNT G E12 001 504 SLEEVE BEARING G E12 408 702 DRAIN HOSE...
  • Page 42 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Distributed in Dec. 2014 No. OCB584 New publication, effective Dec. 2014 Made in Japan Specifications are subject to change without notice.

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