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Mitsubishi Electric PCA-A24KA Service Manual

Pca series ceiling suspended
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS

SERVICE MANUAL

Indoor unit
[Model names]
PCA-A24KA
PCA-A30KA
PCA-A36KA
PCA-A42KA
INDOOR UNIT
TEMP.
REMOTE CONTROLLER
[Service Ref.]
PCA-A24KA
PCA-A30KA
PCA-A36KA
PCA-A42KA
Model name
indication
ON/OFF
CONTENTS
1. REFERENCE MANUAL ................................... 2
2. SAFETY PRECAUTION ................................... 3
3. PART NAMES AND FUNCTIONS .................... 4
4. SPECIFICATIONS ............................................ 6
5. NOISE CRITERION CURVES .......................... 8
6. OUTLINES AND DIMENSIONS ....................... 9
7. WIRING DIAGRAM ......................................... 11
9. TROUBLESHOOTING ................................... 13
10. SPECIAL FUNCTION ..................................... 28
11. DISASSEMBLY PROCEDURE ....................... 31
PARTS CATALOG (OCB455)
March 2009
No. OCH455
NOTE:
• This manual describes only
service data of the indoor
units.
• RoHS compliant products
have <G> mark on the
spec name plate.

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Summary of Contents for Mitsubishi Electric PCA-A24KA

  • Page 1: Table Of Contents

    March 2009 No. OCH455 SERVICE MANUAL Indoor unit [Model names] [Service Ref.] NOTE: • This manual describes only PCA-A24KA PCA-A24KA service data of the indoor units. PCA-A30KA • RoHS compliant products PCA-A30KA have <G> mark on the spec name plate.

  • Page 2: Reference Manual

    REFERENCE MANUAL 1-1. OUTDOOR UNIT’S SERVICE MANUAL Model name Service Ref. Service Manual No. PUZ-A18/24/30/36/42NHA3 PUZ-A18/24/30/36/42NHA3 PUZ-A18/24/30/36/42NHA3-BS PUZ-A18/24/30/36/42NHA3-BS PUY-A18/24/30/36/42NHA3 PUY-A18/24/30/36/42NHA3 PUY-A18/24/30/36/42NHA3-BS PUY-A18/24/30/36/42NHA3-BS PUZ-HA30/36NHA2 PUZ-HA30/36NHA2 OCH426 OCB426 1-2. TECHNICAL DATA BOOK Series (Outdoor unit) Manual No. PUZ-A•NHA3(-BS) PUY-A•NHA3(-BS) OCS14 PUZ-HA•NHA2 OCS15...

  • 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 Use new refrigerant pipes. Do not use refrigerant other than R410A. If other refrigerant (R22 etc.) is used, chlorine in refrige- rant can cause deterioration of refrigerant oil etc.

  • Page 4: Part Names And Functions

    [2] Additional refrigerant charge When charging directly from cylinder · Check that cylinder for R410A on the market is syphon type. · Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.) Unit Gravimeter [3] Service tools Use the below service tools as exclusive tools for R407C refrigerant.

  • Page 5: Wired Remote Controller

    Wired remote controller “Sensor” indication Display Section Displayed when the remote controller sensor is used. Day-of-Week For purposes of this explanation, Shows the current day of the week. all parts of the display are shown as lit. During actual operation, only Time/Timer Display the relevant items will be lit.

  • Page 6: Specifications

    SPECIFICATIONS 4-1. SPECIFICATIONS PCA-A24KA Service Ref. 1 phase, 60Hz, 208/230V Power supply(phase, cycle, voltage) Max. Fuse Size Min.Circuit Ampacity External finish White Munsell 6.4Y 8.9/0.4 Heat exchanger Plate fin coil Fan(drive) Sirocco fan (direct) Fan motor output 0.095 Fan motor 0.54...
  • Page 7 Service Ref. PCA-A42KA Power supply(phase, cycle, voltage) 1 phase, 60Hz, 208/230V Max. Fuse Size Min.Circuit Ampacity External finish White Munsell 6.4Y 8.9/0.4 Heat exchanger Plate fin coil Fan(drive) Sirocco fan (direct) Fan motor output 0.160 F.L.A Fan motor 0.97 Dry: 23-25-27-29(810-885-955-1025) /min(CFM) Airflow(Low-Medium2-Medium1-High) Wet: 21-23-25-27(740-810-885-955)

  • Page 8: Noise Criterion Curves

    NOISE CRITERION CURVES PCA-A24KA NOTCH SPL(dB) LINE PCA-A30KA 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 HEARING FOR NC-20 NC-20 CONTINUOUS...

  • Page 9: Outlines And Dimensions

    OUTLINES AND DIMENTIONS PCA-A24KA PCA-A30KA Unit: inch (mm)
  • Page 10 PCA-A36KA PCA-A42KA Unit: inch (mm)

  • Page 11: Wiring Diagram

    WIRING DIAGRAM PCA-A24KA PCA-A30KA PCA-A36KA PCA-A42KA [LEGEND] SYMBOL NAME SYMBOL NAME INDOOR CONTROLLER BOARD TERMINAL BLOCK (INDOOR/OUTDOOR CONNECTING LINE) TB5,TB6 TERMINAL BLOCK (REMOTE CONTROLLER CN2L CONNECTOR (LOSSNAY) CN24 TRANSMISSION LINE) CONNECTOR (BACK-UP HEATING) CN30 CONNECTOR (LLC) ROOM TEMP. THERMISTOR CN32 CONNECTOR (REMOTE SWITCH) (32ºF / 15kΩ, 77ºF/ 5.

  • Page 12: Refrigerant System Diagra

    REFRIGERANT SYSTEM DIAGRAM PCA-A24KA PCA-A30KA PCA-A36KA PCA-A42KA 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)

  • Page 13: Troubleshooting

    TROUBLESHOOTING 9-1. TROUBLESHOOTING <Error code display by self-diagnosis and actions to be taken for service (summary)> Present and past error codes are logged and displayed on the wired remote controller or controller board of outdoor unit. Actions to be taken for service and the trouble reoccurrence at field are summarized in the table below. Check the contents below before investigating details.
  • Page 14 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 15 • 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 sec. 0.5 sec. 0.5 sec. 0.5 sec.
  • 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. (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 17: Self-Diagnosis Action Table

    Note: Refer to the manual of outdoor unit for the details of display 9-3. SELF-DIAGNOSIS ACTION TABLE such as F, U, and other E. Abnormal point and detection method Countermeasure Error Code Cause Room temperature thermistor (TH1) Defective thermistor – Check resistance value of thermistor.
  • Page 18 Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is work- (Cooling or drying mode) (Cooling or drying mode) 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 prevention Low load (low temperature) mode if pipe <liquid or condenser/evapo-...
  • Page 19 Abnormal point and detection method Countermeasure Error Code Cause Pipe temperature thermistor/ Defective thermistor – Check resistance value of thermistor. Condenser-Evaporator (TH5) characteristics For characteristics, refer to (P1) above. Check contact failure of connector (CN44) on The unit is in 3-minute resume protec- Contact failure of connector the indoor controller board.
  • Page 20 Abnormal point and detection method Countermeasure Error 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 “main.” Abnormal if remote controller could not other to sub. find blank of transmission path for 6 sec- (In case of 2 remote con- onds and could not transmit.

  • Page 21: Troubleshooting By Inferior Phenomena

    9-4. TROUBLESHOOTING BY INFERIOR PHENOMENA Note: Refer to the manual of outdoor unit 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 22 Note: Refer to the manual of outdoor unit for the detail of remote controller. Phenomena Cause Countermeasure (2)LED2 on indoor controller board • When LED1 on indoor controller board is also blinking. Check indoor/outdoor unit connecting wire is blinking. Connection failure of indoor/outdoor unit connecting for connection failure.

  • Page 23: 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 24 9-6. HOW TO CHECK THE PARTS PCA-A24KA PCA-A30KA PCA-A36KA PCA-A42KA Parts name Check points Room temperature Disconnect the connector then measure the resistance using a tester. thermistor (TH1) (At the ambient temperature 50 F~86 F) Liquid pipe thermistor (TH2) Normal...
  • Page 25 9-6-1. Thermistor <Thermistor Characteristic graph> <Thermistor for lower temperature> Room temperature thermistor (TH1) Thermistor for Pipe temperature thermistor/liquid (TH2) lower temperature Condenser/evaporator temperature thermistor (TH5) Thermistor R =15k ± 3% Fixed number of B=3480 ± 2% t( )Rt=15exp { 3480( 273+t T-32 273+...
  • Page 26 9-7. TEST POINT DIAGRAM Indoor controller board PCA-A24KA PCA-A30KA PCA-A36KA PCA-A42KA LED3 CN90 Transmission Connect to the wireless remote (Indoor/outdoor) controller board (CNB) Vane motor output (MV) CN4Y 12V pulse output i-see sensor (option) CN6Y Model selection sensor motor (option)
  • Page 27 Setting by the dip switch and jumper wire Remarks Functions For service board Model settings Service board MODELS 1 2 3 4 5 PCA-A24KA 1 2 3 4 5 PCA-A30KA Capacity settings 1 2 3 4 5 PCA-A36KA 1 2 3 4 5 PCA-A42KA Pair number <Initial setting>...

  • Page 28: Special Function

    SPECIAL FUNCTION 10-1. Rotation Function (and back-up function, 2nd stage cut-in function) 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. w Main and sub unit should be set by refrigerant address. (Outdoor Dip switch setting) Refrigerant address "00"...
  • Page 29 System constraint · This function is available only in cooling mode. Ex.) Set temp. by R/C = 20:(68°F) [2nd stage cut-in function]··· Request code number "322~324" Set point = 26:(79°F) When request code number is “323”. Room temp. Set point Room temp.
  • Page 30 (2) Setting method of each function by wired remote controller B: Refrigerant address C: Data display area D: Request code display area 1. Stop operation( ). 2. Press the button ( ) for 3 seconds so that [Maintenance mode] appears on the screen ( ). TEST After a while, [00] appears in the refrigerant address number display area.(at 3.

  • Page 31: Disassembly Procedure

    DISASSEMBLY PROCEDURE PCA-A24KA PCA-A30KA PCA-A36KA PCA-A42KA Be careful when removing heavy parts. (Photo: PCA-A36KA) OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 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 32 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 3. Removing the room temperature thermistor (TH1) Photo 4 (1) Remove the air intake grille. (See Figure 1,2) Casing (2) Remove the screw from the beam and remove the beam. (See Photo 1) (3) Remove 2 screws from the electrical cover, and remove the electrical cover.
  • Page 33 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 5. Removing the fan (3 connection) Photo 9 (1) Remove the air intake grille. (See Figure 1,2) (2) Remove the screw from the beam and remove the beam. (See Photo 1) (3) Remove 2 screws from the electrical cover, and remove the electrical cover.
  • Page 34 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Photo 12 7. Removing the vane motor (1) Remove the air intake. (See Figure 1,2) Connector (2) Remove the right side panel. (See Figure 3) Vane motor and cover (3) Remove the connector of vane motor. (4) Remove 2 screws of vane motor cover, then remove vane motor.
  • Page 35 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Photo 18 10. Removing the thermistors/Liquid pipe (TH2) and con- denser/evaporator (TH5) (1) Remove the air intake grille. (See Figure 1, 2) (2) Remove the left and right side panels. (See Figure 3) (3) Remove the under panel. (See Photo 14) (4) Remove the drain pan.
  • Page 36 Vane HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN New publication, effective Mar. 2009 Specifications subject to change without notice CCopyright 2009 MITSUBISHI ELECTRIC ENGINEERING CO., LTD. Distributed in Mar. 2009 No.OCH455 PDF 7 Made in Japan...

This manual is also suitable for:

Pca-a36kaPca-a30kaPca-a42ka

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