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SPLIT-SYSTEM HEAT PUMP
SERVICE MANUAL
Indoor unit
[Model Name]
[Service Ref.]
PCA-A24KA6.TH
PCA-A24KA6
PCA-A30KA6.TH
PCA-A30KA6
PCA-A36KA6.TH
PCA-A36KA6
PCA-A42KA6.TH
PCA-A42KA6
INDOOR UNIT
TEMP.
ON/OFF
WIRED REMOTE
CONTROLLER
(Option)
Model name
indication
COOL
DRY
AUTO
FAN
HEAT
IR WIRELESS REMOTE
CONTROLLER (Option)
Notes:
• This manual describes only
• RoHS compliant products
CONTENTS
1. REFERENCE MANUAL ................................... 2
2. SAFETY PRECAUTION ................................... 3
3. PARTS NAMES AND FUNCTIONS ................. 4
4. SPECIFICATIONS ........................................... 10
5. NOISE CRITERION CURVES ......................... 12
6. OUTLINES AND DIMENSIONS ...................... 13
7. WIRING DIAGRAM ......................................... 15
8. REFRIGERANT SYSTEM DIAGRAM ............ 16
9. TROUBLESHOOTING ................................... 17
10. SPECIAL FUNCTION ..................................... 31
11. DISASSEMBLY PROCEDURE ....................... 34
PARTS CATALOG (OCB585)
December 2014
No. OCH585
service data of the indoor
units.
have <G> mark on the
spec name plate.
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Table of Contents
Related Manuals for Mitsubishi Electric Mr.SLIM PCA-A24KA6
Summary of Contents for Mitsubishi Electric Mr.SLIM PCA-A24KA6
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Page 1: Table Of Contents
SPLIT-SYSTEM HEAT PUMP December 2014 No. OCH585 SERVICE MANUAL Indoor unit [Model Name] [Service Ref.] Notes: PCA-A24KA6.TH • This manual describes only service data of the indoor PCA-A24KA6 units. PCA-A30KA6.TH • RoHS compliant products have <G> mark on the PCA-A30KA6 spec name plate. -
Page 2: Reference Manual
REFERENCE MANUAL OUTDOOR UNIT SERVICE MANUAL Model Name Service Ref. Service Manual No. PUZ-A18/24/30/36/42NHA6 PUZ-A18/24/30/36/42NHA6 PUZ-A18/24/30/36/42NHA6-BS PUZ-A18/24/30/36/42NHA6-BS OCH577 OCB577 PUY-A12/18/24/30/36/42NHA6 PUY-A12/18/24/30/36/42NHA6 PUY-A12/18/24/30/36/42NHA6-BS PUY-A12/18/24/30/36/42NHA6-BS PUZ-HA30/36NHA2 PUZ-HA30/36NHA2 OCH426/OCB426 PUZ-HA42NKA PUZ-HA42NKA OCH567/OCB567 MXZ-3C30NA MXZ-3C30NA OBH702/OBB702 MXZ-4C36NA MXZ-4C36NA MXZ-5C42NA MXZ-5C42NA OCH573 OCB573 MXZ-3C30NAHZ MXZ-3C30NAHZ MXZ-8C48NAHZ MXZ-8C48NAHZ Remote controller (Optional parts) -
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: Parts Names And Functions
[2] Additional refrigerant charge When charging directly from cylinder · Check that cylinder for R410A on the market is a syphon type. · Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.) Unit Gravimeter [3] Service tools... - 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 five 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. display MODEL SELECT Blinks when model is selected. display Lights up while the signal is transmitted to the indoor unit when the button is pressed.
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Page 10: Specifications
SPECIFICATIONS PCA-A24KA6.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 0.54 Fan motor F.L.A... - Page 11 Service Ref. PCA-A42KA6.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 F.L.A Fan motor...
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Page 12: Noise Criterion Curves
NOISE CRITERION CURVES PCA-A24KA6.TH PCA-A30KA6.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-A24KA6.TH PCA-A30KA6.TH Unit: in (mm) OCH585... - Page 14 PCA-A36KA6.TH PCA-A42KA6.TH Unit: in (mm) OCH585...
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Page 15: Wiring Diagram
WIRING DIAGRAM PCA-A24KA6.TH PCA-A30KA6.TH PCA-A36KA6.TH PCA-A42KA6.TH [LEGEND] SYMBOL NAME SYMBOL NAME INDOOR CONTROLLER BOARD TERMINAL BLOCK (INDOOR/OUTDOOR CONNECTING LINE) CN2L TERMINAL BLOCK (REMOTE CONTROLLER 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 16: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM PCA-A24KA6.TH PCA-A30KA6.TH PCA-A36KA6.TH PCA-A42KA6.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 <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- doorunit. 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 <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 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 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: 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 22 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 23 Abnormal point and detection method Countermeasure Check code Cause Pipe temperature thermistor/ 1 Defective thermistor 1–3 Check resistance value of thermistor. For characteristics, refer to (P1) above. Condenser-Evaporator (TH5) 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 24 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 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-A24KA6.TH PCA-A30KA6.TH PCA-A36KA6.TH PCA-A42KA6.TH Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. thermistor (TH1) (At the ambient temperature 50 to 86˚F [10 to 30˚C] ) Liquid pipe thermistor (TH2) Normal Abnormal...
- Page 28 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 =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-A24KA6.TH PCA-A30KA6.TH PCA-A36KA6.TH PCA-A42KA6.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. SW1 and SW2 are equipped only for service parts. Model setting and capacity setting are preset in the nonvolatile memory of the controller board of the unit. PCA-A24KA6.TH PCA-A30KA6.TH PCA-A36KA6.TH...
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Page 31: Special Function
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 32 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 33 (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). •...
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Page 34: Disassembly Procedure
DISASSEMBLY PROCEDURE PCA-A24KA6.TH PCA-A30KA6.TH Be careful when removing heavy parts. PCA-A36KA6.TH PCA-A42KA6.TH (Photo: PCA-A36KA6) 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 35 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 36 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 37 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 38 OPERATING PROCEDURE PHOTOS 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 39 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 40 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN New publication, effective Dec. 2014 CCopyright 2014 MITSUBISHI ELECTRIC CORPORATION Specifications are subject to change without notice. Distributed in Dec. 2014 No.OCH585 Made in Japan...