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Mitsubishi Electric PCA Series Service Manual

Indoor unit
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Table of Contents

L T Y TE
HEAT U
SERVICE MANUAL
Indoor unit
[Model Name]
[Service Ref.]
PCA-A24KA7.TH
PCA-A24KA7
PCA-A30KA7.TH
PCA-A30KA7
PCA-A36KA7.TH
PCA-A36KA7
PCA-A42KA7.TH
PCA-A42KA7
INDOOR UNIT
WIRED REMOTE
CONTROLLER
(Option)
o e
COOL
DRY
AUTO
FAN
HEAT
IR WIRELESS REMOTE
CONTROLLER (Option)
CONTENTS
1. REFERENCE MANUAL ................................... 2
2. SAFETY PRECAUTION ................................... 3
3. PARTS NAMES AND FUNCTIONS ................. 5
4. SPECIFICATIONS ........................................... 10
5. NOISE CRITERION CURVES ......................... 12
6. OUTLINES AND DIMENSIONS ...................... 13
7. WIRING DIAGRAM ......................................... 15
9. TROUBLESHOOTING ................................... 17
e
10. FUNCTION SETTING ..................................... 31
t o
11. SPECIAL FUNCTION ..................................... 32
12. DISASSEMBLY PROCEDURE ....................... 36
PARTS CATALOG (OCB638)
October 2016
No. OCH638
Notes:
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Summary of Contents for Mitsubishi Electric PCA Series

  • Page 1: Table Of Contents

    L T Y TE HEAT U October 2016 No. OCH638 SERVICE MANUAL Indoor unit [Model Name] [Service Ref.] Notes: es o PCA-A24KA7.TH t o t e PCA-A24KA7 PCA-A30KA7.TH o t e PCA-A30KA7 PCA-A36KA7.TH PCA-A36KA7 PCA-A42KA7.TH PCA-A42KA7 CONTENTS 1. REFERENCE MANUAL ........2 2.

  • Page 2: Reference Manual

    REFERENCE MANUAL OUTDOOR UNIT SERVICE MANUAL o e N e Re U A2 3 NHA U A2 3 NHA U A3 2N A U A3 2N A U A2 3 NHA U A2 3 NHA U A3 2N A U A3 2N A OCH 3 UY A2 3 NHA...

  • 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 the following tools specifically designed for Use new refrigerant pipes. use with R410A refrigerant.
  • Page 4 [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) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them. [2] Additional refrigerant charge When charging directly from cylinder (1) Check that cylinder for R410A on the market is a syphon type.

  • Page 5: Parts Names And Functions

    PARTS NAMES AND FUNCTIONS 3-1. Indoor Unit Louver Air outlet Vane Filter (Inside of Air intake) Air intake 3-2. 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.
  • Page 6 Display The main display can be displayed in 2 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.) ...
  • Page 7 Menu structure Press the button. MENU Main menu Move the cursor to the desired item with the buttons, and press the SELECT button. Vane · Louver · Vent. (Lossnay) High power Timer ON/OFF timer Auto-OFF timer Weekly timer Restriction Temp. range Operation lock Energy saving Auto return...
  • 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 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 3-3. 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

    SPECIFICATIONS PCA-A24KA7.TH Service Ref. Power supply(phase, cycle, voltage) 1 phase, 60 Hz, 208/230 V Max. Fuse Size Min.Circuit Ampacity External finish White Munsell 6.4Y 8.9/0.4 Heat exchanger Plate fin coil Fan(drive) o No. Sirocco fan (direct) o 3 0.095 Fan motor output Fan motor 0.54 F.L.A...
  • Page 11 Service Ref. PCA-A42KA7.TH Power supply(phase, cycle, voltage) 1 phase, 60 Hz, 208/230 V Max. Fuse Size Min.Circuit Ampacity External finish White Munsell 6.4Y 8.9/0.4 Heat exchanger Plate fin coil Fan(drive) o No. Sirocco fan (direct) o 4 Fan motor output 0.160 Fan motor F.L.A...

  • Page 12: Noise Criterion Curves

    NOISE CRITERION CURVES PCA-A24KA7.TH PCA-A30KA7.TH NOTCH SPL(dB) LINE 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 NC-20 HEARING FOR NC-20 CONTINUOUS CONTINUOUS NOISE NOISE...

  • Page 13: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PCA-A24KA7.TH PCA-A30KA7.TH Unit: inch (mm) OCH638...
  • Page 14 PCA-A36KA7.TH PCA-A42KA7.TH Unit: in (mm) OCH638...

  • Page 15: Wiring Diagram

    WIRING DIAGRAM PCA-A24KA7.TH PCA-A30KA7.TH PCA-A36KA7.TH PCA-A42KA7.TH SYMBOL NAME SYMBOL NAME INDOOR CONTROLLER BOARD TERMINAL BLOCK (INDOOR/OUTDOOR CONNECTING LINE) TERMINAL BLOCK (REMOTE CONTROLLER CN2L CONNECTOR (LOSSNAY) TRANSMISSION LINE) CN24 CONNECTOR (BACK-UP HEATING) CN32 CONNECTOR (REMOTE SWITCH) ROOM TEMP. THERMISTOR CN41 CONNECTOR (HA TERMINAL-A) CN51 PIPE TEMP.

  • Page 16: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PCA-A24KA7.TH PCA-A30KA7.TH PCA-A36KA7.TH PCA-A42KA7.TH 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) Strainer Distributor with strainer 1/2...

  • Page 17: Troubleshooting

    TROUBLESHOOTING 9-1. TROUBLESHOOTING 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 18 9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER 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> IR wireless remote controller [Procedure] 1.
  • Page 19 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 Approx.
  • Page 20 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 21 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 22 Check code Abnormal point and detection method Cause Countermeasure Freezing/overheating protection is work- (Cooling or drying mode) (Cooling or drying mode) 1 Check clogs of the filter. 1 Clogged filter (reduced airflow) 1 Freezing protection (Cooling mode) 2 Short cycle of air path 2 Remove shields.
  • Page 23 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 24 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 25 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 26 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 control- ler malfunctions, the Emergency Operation can be done using the emer- gency buttons on the grille.
  • Page 27 9-6. HOW TO CHECK THE PARTS PCA-A24KA7.TH PCA-A30KA7.TH PCA-A36KA7.TH PCA-A42KA7.TH Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. (At the ambient temperature 50 to 86 Pipe temperature Normal Abnormal Condenser/evaporator " temperature thermistor Open or short Vane motor (MV) Measure the resistance between the terminals with a tester.
  • Page 28 9-6-1. Thermistor Room temperature thermistor (TH1) Thermistor for Pipe temperature thermistor/liquid (TH2) lower temperature Condenser/evaporator temperature thermistor (TH5) " Thermistor R =15 k ± 3% Fixed number of B=3480 ± 2% t( )Rt=15exp { 3480( 273+t T-32 273+...
  • Page 29 9-7. TEST POINT DIAGRAM Indoor controller board PCA-A24KA7.TH PCA-A30KA7.TH PCA-A36KA7.TH PCA-A42KA7.TH LED3 CN2L CN90 Transmission Connector (LOSSNAY) Connect to the IR wireless (Indoor/outdoor) remote controller board (CNB) Vane motor output (MV) CN4Y 12 V pulse output i-See sensor (option) CN6Y Model selection sensor motor (option) Capacity setting...
  • Page 30 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. PCA-A24KA7.TH PCA-A30KA7.TH PCA-A36KA7.TH PCA-A42KA7.TH The black square ( ) indicates a switch position. Jumper wire ( : Short : Open) Jumper wire...

  • Page 31: 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 32: 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 33 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 34 (2) Rotation and back up operation PAR-3xMAA ("x" represents 0 or later) 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...
  • Page 35 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 >...

  • Page 36: Disassembly Procedure

    DISASSEMBLY PROCEDURE PCA-A24KA7.TH PCA-A30KA7.TH Be careful when removing heavy parts. PCA-A36KA7.TH PCA-A42KA7.TH (Photo: PCA-A36KA7) 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 37 OPERATING PROCEDURE PHOTOS 3. Removing the room temperature thermistor (TH1) Photo 4 (1) Remove the air intake grille. (See Figure 1, 2) Casing (2) Remove the beam by removing 1 screw (4 8 PT) (See Photo 1) (3) Remove 2 screws from the electrical cover, and remove the electrical cover.
  • Page 38 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 beam by removing 1 screw (4 8 PT) (See Photo 1) (3) Remove 2 screws from the electrical cover, and remove the electrical cover.
  • Page 39 OPERATING PROCEDURE PHOTOS Photo 12 7. Removing the vane motor (1) Remove the air intake. (See Figure 1, 2) Connector Vane motor and cover (2) Remove the right side panel. (See Figure 3, 4) (3) Remove the connector of vane motor. (4) Remove 2 screws of vane motor cover, then remove vane motor.
  • Page 40 OPERATING PROCEDURE PHOTOS Photo 17 10. Removing the pipe temperature thermistor/liquid (TH2) and the condenser/evaporator temperature thermistor (TH5) (1) Remove the air intake grille. (See Figure 1, 2) (2) Remove the left and right side panels. (See Figure 3, 4) (3) Remove the under panel.
  • Page 41 OPERATING PROCEDURE PHOTOS Photo 21 13. Removing the heat exchanger (1) Remove the air intake grille. (See Figure 1, 2) (2) Remove the left and right side panels. (See Figure 3, 4) (3) Remove the under panel. (See Photo 13) (4) Remove the drain pan.
  • Page 42 HEAD OFFICE : TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2016 MITSUBISHI ELECTRIC CORPORATION Published: Oct. 2016 No.OCH638 Made in Japan Specifications are subject to change without notice.

This manual is also suitable for:

Pca-a42ka7Pca-a36ka7Pca-a24ka7Pca-a30ka7

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