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Mitsubishi Electric Mr.SLIM PCA Series Service Manual
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Mitsubishi Electric Mr.SLIM PCA Series Service Manual

Split-type, heat pump air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Indoor unit
[Model names]
[Service Ref.]
PCA-A24KA4.TH
PCA-A24KA4
PCA-A30KA4.TH
PCA-A30KA4
PCA-A36KA4.TH
PCA-A36KA4
PCA-A42KA5.TH
PCA-A42KA5
INDOOR UNIT
TEMP.
ON/OFF
WIRED REMOTE
CONTROLLER
(Option)
Model name
indication
COOL
DRY
AUTO
FAN
HEAT
IR WIRELESS REMOTE
CONTROLLER (Option)
NOTE:
• This manual describes only
• RoHS compliant products
CONTENTS
1. REFERENCE MANUAL ................................... 2
2. SAFETY PRECAUTION ................................... 3
3. PART NAMES AND FUNCTIONS .................... 4
4. SPECIFICATIONS ............................................ 7
5. NOISE CRITERION CURVES .......................... 9
6. OUTLINES AND DIMENSIONS ...................... 10
7. WIRING DIAGRAM ......................................... 12
8. REFRIGERANT SYSTEM DIAGRAM ............ 13
9. TROUBLESHOOTING ................................... 14
10. SPECIAL FUNCTION ..................................... 28
11. DISASSEMBLY PROCEDURE ....................... 31
PARTS CATALOG (OCB501)
March 2012
No. OCH501
service data of the indoor
units.
have <G> mark on the
spec name plate.

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Summary of Contents for Mitsubishi Electric Mr.SLIM PCA Series

  • Page 1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS March 2012 No. OCH501 SERVICE MANUAL Indoor unit [Model names] [Service Ref.] NOTE: • This manual describes only PCA-A24KA4.TH service data of the indoor PCA-A24KA4 units. • RoHS compliant products PCA-A30KA4.TH have <G> mark on the PCA-A30KA4 spec name plate.
  • Page 2 REFERENCE MANUAL OUTDOOR UNIT’S SERVICE MANUAL Model name Service Ref. Service Manual No. PUZ-A18/24/30/36/42NHA4 PUZ-A18/24/30/36/42NHA4 PUZ-A18/24/30/36/42NHA4-BS PUZ-A18/24/30/36/42NHA4-BS OCH481 OCB481 PUY-A12/18/24/30/36/42NHA4 PUY-A12/18/24/30/36/42NHA4 PUY-A12/18/24/30/36/42NHA4-BS PUY-A12/18/24/30/36/42NHA4-BS PUZ-HA30/36NHA4 PUZ-HA30/36NHA4 OCH504/OCB504 PUZ-A42NHA5 PUZ-A42NHA5 PUZ-A42NHA5-BS PUZ-A42NHA5-BS OCH512 OCB512 PUY-A42NHA5 PUY-A42NHA5 PUY-A42NHA5-BS PUY-A42NHA5-BS Remote controller (Optional parts) Radio frequency interface Wired remote controller IR wireless remote controller...
  • 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 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: Indoor Unit

    [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 R410A refrigerant.
  • Page 5 Wired remote controller (Option) “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. During actual operation, only Time/Timer Display the relevant items will be lit.
  • Page 6 IR wireless remote controller (Option) CHECK TEST RUN display Indicate that the unit is being checked or test-run. MODEL SELECT display display Blinks when model is selected. Lights up while the signal is transmitted to the indoor unit when the button is pressed. Temperature setting display Indicates the desired temperature setting which is set.
  • Page 7 SPECIFICATIONS PCA-A24KA4.TH Service Ref. 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 Sirocco fan (direct) Fan(drive) Fan motor output 0.095 Fan motor 0.54 F.L.A Dry: 15-16-17-19(530-565-600-670) /min(CFM) Airflow(Low-Medium2-Medium1-High)
  • Page 8 Service Ref. PCA-A42KA5.TH 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 Fan motor F.L.A 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 9 NOISE CRITERION CURVES PCA-A24KA4.TH NOTCH SPL(dB) LINE PCA-A30KA4.TH 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 10 OUTLINES AND DIMENSIONS PCA-A24KA4.TH PCA-A30KA4.TH Unit: inch (mm) OCH501...
  • Page 11 PCA-A36KA4.TH PCA-A42KA5.TH Unit: inch (mm) 11 11 OCH501...

  • Page 12: Pca-A24Ka4

    WIRING DIAGRAM PCA-A24KA4.TH PCA-A30KA4.TH PCA-A36KA4.TH PCA-A42KA5.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) CN30 CONNECTOR (LLC) ROOM TEMP. THERMISTOR CN32 CONNECTOR (REMOTE SWITCH) (32ºF / 15kΩ, 77ºF / 5.4kΩ...
  • Page 13 REFRIGERANT SYSTEM DIAGRAM PCA-A24KA4.TH PCA-A30KA4.TH PCA-A36KA4.TH PCA-A42KA5.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 14 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 15 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> ■...
  • Page 16 • 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 17: Wired Remote Controller (Option)

    • 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 18 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 19 Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is (Cooling or drying mode) (Cooling or drying mode) opearting Clogged filter (reduced airflow) Check clogs of the filter. Freezing protection (Cooling mode) Short cycle of air path Remove blockage. The unit is in 6-minute resume prevention Low load (low temperature) mode if pipe <liquid or condenser/evapo-...
  • Page 20 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 21 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 22 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 23 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 24: Pca-A24Ka4.Th

    9-6. HOW TO CHECK THE PARTS PCA-A24KA4.TH PCA-A30KA4.TH PCA-A36KA4.TH PCA-A42KA5.TH Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. thermistor (TH1) (At the ambient temperature 50 F–86 F) Liquid pipe thermistor (TH2) Normal Abnormal Condenser/evaporator (Refer to the next page for a detail.)
  • 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-A24KA4.TH PCA-A30KA4.TH PCA-A36KA4.TH PCA-A42KA5.TH LED3 CN2L CN90 Transmission Connector (LOSSNAY) Connect to the IR wireless (Indoor/outdoor) remote controller board (CNB) Vane motor output (MV) CN4Y 12V pulse output i-see sensor (option) CN6Y Model selection sensor motor (option) Capacity setting CN105...
  • Page 27 9-8. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the dip switch and the jumper wire on control P.C. board. SW1 and SW2 are equipped only for service parts. Model setting and capacity setting are memorized in the nonvolatile memory of the control P.C. board of the unit.
  • Page 28 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. w Main and sub unit should be set by refrigerant address.
  • 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: Pca-A30Ka4.Th

    DISASSEMBLY PROCEDURE PCA-A24KA4.TH PCA-A30KA4.TH Be careful when removing heavy parts. PCA-A36KA4.TH PCA-A42KA5.TH (Photo: PCA-A36KA4) 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 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 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 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 34 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 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 35 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Photo 17 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, 4) (3) Remove the under panel. (See Photo 13) (4) Remove the drain pan.
  • Page 36 Heat exchanger Vane HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2012 MITSUBISHI ELECTRIC CORPORATION New publication, effective Mar. 2012 Specifications are subject to change without notice. Distributed in Mar. 2012 No.OCH501 Made in Japan...

  • Page 37: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS March 2012 No. OCB501 PARTS CATALOG Indoor unit [Model names] [Service Ref.] NOTE: • RoHS compliant products PCA-A24KA4.TH have <G> mark on the PCA-A24KA4 spec name plate. PCA-A30KA4.TH PCA-A30KA4 PCA-A36KA4.TH PCA-A36KA4 PCA-A42KA5.TH PCA-A42KA4 CONTENTS 1.
  • Page 38 RoHS PARTS LIST STRUCTURAL AND FUNCTIONAL PARTS (1) PCA-A24KA4.TH PCA-A30KA4.TH PCA-A36KA4.TH PCA-A42KA5.TH OCB501...

  • Page 39: Rohs Parts List

    RoHS PARTS LIST Q'ty/set Wiring Recom- Remarks Part No. Part Name Specifi cation PCA-A·KA4.TH Diagram mended PCA-A42 (Drawing No.) Symbol Q'ty KA5.TH E17 648 086 SIDE PANEL-L E17 648 809 LEG-L E17 664 252 SIDE PLATE-L E17 648 648 COIL SUPPORT-H E17 649 648 COIL SUPPORT-H E17 651 648 COIL SUPPORT-H E17 664 620 HEAT EXCHANGER...
  • Page 40 RoHS PARTS LIST STRUCTURAL AND FUNCTIONAL PARTS (2) PCA-A24KA4.TH PCA-A30KA4.TH PCA-A36KA4.TH PCA-A42KA5.TH 8 · 9 OCB501...
  • Page 41 RoHS PARTS LIST Q'ty/set Wiring Recom- Remarks Part No. Part Name Specifi cation PCA-A·KA4.TH Diagram mended PCA-A42 (Drawing No.) Symbol Q'ty KA5.TH G E17 648 500 SIROCCO FAN G E17 648 237 FAN CASING TOP+UNDER G E17 648 512 BEARING SUPPORT G E17 648 504 BEARING G E17 649 500 SIROCCO FAN G E17 648 334 MOTOR LEG...
  • Page 42 RoHS PARTS LIST ELECTRICAL PARTS PCA-A24KA4.TH PCA-A30KA4.TH PCA-A36KA4.TH PCA-A42KA5.TH Q'ty/set Wiring Recom- Remarks PCA-A24KA4.TH Part No. Part Name Specifi cation Diagram mended (Drawing No.) PCA-A30KA4.TH PCA-A42KA5.TH Symbol Q'ty PCA-A36KA4.TH G E17 518 308 THERMISTOR (ROOM) – SENSOR COVER (RG25V835G03) – ELECTRICAL BOX (BH00R345G08) G E17 664 447 CONTROLLER BOARD...
  • Page 43 OCB501...
  • Page 44 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2012 MITSUBISHI ELECTRIC CORPORATION New publication, effective Mar. 2012 Specifications are subject to change without notice. Distributed in Mar. 2012 No.OCB501 Made in Japan...

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