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SPLIT-SYSTEM HEAT PUMP
SERVICE MANUAL
Indoor unit
[Model Name]
PLA-A12BA6
PLA-A18BA6
PLA-A24BA6
PLA-A30BA6
PLA-A36BA6
PLA-A42BA6
Model name
indication
INDOOR UNIT
ON/OFF
TEMP
IR WIRELESS REMOTE
CONTROLLER
(Option)
[Service Ref.]
PLA-A12BA6
PLA-A18BA6
PLA-A24BA6
PLA-A30BA6
PLA-A36BA6
PLA-A42BA6
WIRED REMOTE
CONTROLLER
(Option)
December 2014
No. OCH581
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 ...... 5
4. SPECIFICATIONS ............................... 11
5. NOISE CRITERION CURVES ............. 13
6. OUTLINES AND DIMENSIONS ............ 15
7. WIRING DIAGRAM ............................. 16
8. REFRIGERANT SYSTEM DIAGRAM ...... 17
9. TROUBLESHOOTING ........................ 18
10. SPECIAL FUNCTION ......................... 32
11. DISASSEMBLY PROCEDURE ........... 35
PARTS CATALOG (OCB581)
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Table of Contents
Related Manuals for Mitsubishi Electric Mr.Slim PLA-A12BA6
Summary of Contents for Mitsubishi Electric Mr.Slim PLA-A12BA6
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Page 1: Table Of Contents
SPLIT-SYSTEM HEAT PUMP December 2014 No. OCH581 SERVICE MANUAL Indoor unit [Model Name] [Service Ref.] Notes: • This manual describes service PLA-A12BA6 PLA-A12BA6 data of the indoor units only. • RoHS compliant products have PLA-A18BA6 <G> mark on the spec name PLA-A18BA6 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-3C24/30NA MXZ-3C24/30NA OBH702/OBB702 MXZ-3C24/30NAHZ MXZ-3C24/30NAHZ MXZ-4C36NA MXZ-4C36NA MXZ-5C42NA MXZ-5C42NA MXZ-8C48NA MXZ-8C48NA OCH573 OCB573 MXZ-4C36NAHZ... -
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 the 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.
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Page 5: Parts Names And Functions
PARTS NAMES AND FUNCTIONS Drain pipe Filter Air outlet Liquid pipe Gas pipe i-see sensor (option) Vane Air intake (Intake grille) OCH581... - Page 6 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 7 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 8 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 9 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 10 IR wireless remote controller (Option) display CHECK TEST RUN 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 11: Specifications
SPECIFICATIONS Service Ref. PLA-A12BA6 Power supply (phase, cycle, voltage) Single phase,60 Hz, 208/230 V Max. Fuse Size Min. Circuit Ampacity External finish (Panel) Munsell 6.4Y 8.9/0.4 Heat exchanger Plate fin coil Fan (drive) o No. Turbo fan (direct) o 1 Fan motor output 0.05 Fan motor... - Page 12 Service Ref. PLA-A30BA6 Power supply (phase, cycle, voltage) Single phase, 60 Hz, 208/230 V Max. Fuse Size Min. Circuit Ampacity External finish (Panel) Munsell 6.4Y 8.9/0.4 Heat exchanger Plate fin coil Fan (drive) o No. Turbo fan (direct) o 1 Fan motor output 0.05 Fan motor...
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Page 13: Noise Criterion Curves
NOISE CRITERION CURVES PLA-A12BA6 PLA-A18BA6 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 HEARING FOR NC-20 NC-20 CONTINUOUS CONTINUOUS NOISE NOISE... - Page 14 PLA-A36BA6 PLA-A42BA6 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 HEARING FOR NC-20 NC-20 CONTINUOUS CONTINUOUS NOISE NOISE 1000 2000 4000...
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Page 15: Outlines And Dimensions
OUTLINES AND DIMENSIONS INDOOR UNIT PLA-A12BA6 PLA-A18BA6 PLA-A24BA6 PLA-A30BA6 PLA-A36BA6 PLA-A42BA6 Unit: in (mm) Ceiling hole 25/32 to 1-25/32(20~45) 33-27/32 to 35-13/16(860~910) 25/32 to 1-25/32(20~45) 31-7/8(810) Detail connecting of Branch duct(Both aspects) Fresh air Suspension bolt pitch 6-5/16 intake hole (160) (100) (100) -
Page 16: Wiring Diagram
WIRING DIAGRAM INDOOR UNIT PLA-A12BA6 PLA-A18BA6 PLA-A24BA6 PLA-A30BA6 PLA-A36BA6 PLA-A42BA6 [LEGEND] SYMBOL NAME SYMBOL NAME INDOOR CONTROLLER BOARD FAN MOTOR CN2L VANE MOTOR CONNECTOR (LOSSNAY) CN24 CONNECTOR<BACK-UP HEATING> TERMINAL BLOCK (INDOOR/OUTDOOR CONNECTING LINE) TERMINAL BLOCK (REMOTE CONTROLLER CN30 CONNECTOR<LLC> TB5,TB6 TRANSMISSION LINE) CN32 CONNECTOR (REMOTE SWITCH) -
Page 17: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM PLA-A12BA6 PLA-A18BA6 PLA-A24BA6 PLA-A30BA6 PLA-A36BA6 PLA-A42BA6 Strainer (#50) Heat exchanger Refrigerant GAS pipe connection (Flare) Thermistor TH5 (Cond./ Eva. temperature) Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection (Flare) Thermistor TH2 Pipe temperature (Liquid) Thermistor TH1 (Room temperature) Strainer (#50) -
Page 18: 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 19 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> ■IR wireless remote controller [Procedure] 1.
- Page 20 • 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 21 • On IR wireless remote controller The continuous buzzer sounds from receiving section of indoor unit. Blink of operation lamp • On wired remote controller 1 Check code displayed in the LCD. (Refer to the previous page, 1 check code.) •...
- Page 22 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 23 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 24 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) characteristics For characteristics, refer to (P1) above. 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 25 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 26 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 1 The vane is not downward during defrosting and heat 1 Normal operation (The vane is set to performance failure preparation and when the thermostat is OFF in HEAT horizontal regardless of remote control.)
- Page 27 9-5. EMERGENCY OPERATION 9-5-1. When IR wireless remote controller troubles 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 28 9-6. HOW TO CHECK THE PARTS PLA-A12BA6 PLA-A18BA6 PLA-A24BA6 PLA-A30BA6 PLA-A36BA6 PLA-A42BA6 Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. thermistor (TH1) (At the ambient temperature of 50 to 86˚F [10 to 30˚C]) Pipe temperature Normal Abnormal...
- Page 30 9-7. TEST POINT DIAGRAM Indoor controller board PLA-A12BA6 PLA-A18BA6 PLA-A24BA6 PLA-A30BA6 PLA-A36BA6 PLA-A42BA6 CN90 LED3 CN2L Connect to the IR wireless Transmission Connector (LOSSNAY) Vane motor output (MV) remote controller board (Indoor/outdoor) 12 V pulse output (CNB) CN4Y Model selection i-see sensor CN6Y i-see sensor motor output...
- Page 31 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 indoor controller board. PLA-A12BA6 PLA-A18BA6 PLA-A24BA6...
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Page 32: 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 · Operating the unit of main and sub alternately according to the interval setting. (Rotation function) Note: The setting of main/sub unit depends on the refrigerant address. - Page 34 (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 •...
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Page 35: Disassembly Procedure
DISASSEMBLY PROCEDURE PLA-A12BA6 PLA-A18BA6 PLA-A24BA6 PLA-A30BA6 PLA-A36BA6 PLA-A42BA6 Be careful when removing heavy parts. OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 1. Removing the air intake grille Figure 1 (1) Slide the knob of air intake grille toward the arrow 1 to Filter open the air intake grille. - Page 36 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 5. Removing the fan and fan motor (MF) Coil plate Photo 3 (1) Remove the electrical box. (See Photo 2) (2) Remove the bell mouth (3 screws). (See Photo 2) (3) Remove the turbo fan nut. (4) Pull out the turbo fan.
- Page 37 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Photo 8 9. Removing the drain pump (DP) and float switch (FS) (1) Remove the drain pan. (See Photo 6) (2) Cut the hose band and remove the hose. Float switch (3) Remove the drain pump assembly (3 screws and 2 hooks). (4) Remove the drain pump (3 screws).
- Page 38 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN New publication, effective Nov. 2014 CCopyright 2014 MITSUBISHI ELECTRIC CORPORATION Specifications are subject to change without notice. Distributed in Nov. 2014 No.OCH581 Made in Japan...