Mitsubishi Electric PLA-SP71BA.UK Service Manual
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Mitsubishi Electric PLA-SP71BA.UK Service Manual

Mitsubishi Electric PLA-SP71BA.UK Service Manual

Split-type, heat pump air conditioners split-type, air conditioners
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS

SERVICE MANUAL

Indoor unit
[Model Name]
PLA-SP71BA
PLA-SP100BA
PLA-SP125BA
PLA-SP140BA
Model name
indication
INDOOR UNIT
ON/OFF
TEMP
WIRELESS REMOTE
CONTROLLER
[Service Ref.]
PLA-SP71BA.UK
PLA-SP100BA.UK
PLA-SP125BA.UK
PLA-SP140BA.UK
WIRED REMOTE
CONTROLLER
Note:
• 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 ................ 4
4. SPECIFICATIONS ......................................... 11
5. NOISE CRITERION CURVES ....................... 13
6. OUTLINES AND DIMENSIONS ..................... 14
7. WIRING DIAGRAM ........................................ 15
9. TROUBLESHOOTING ................................... 17
10. SPECIAL FUNCTION .................................... 33
11. DISASSEMBLY PROCEDURE ...................... 41
PARTS CATALOG (OCB565)
May 2014
No. OCH565

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Summary of Contents for Mitsubishi Electric PLA-SP71BA.UK

  • Page 1: Table Of Contents

    May 2014 No. OCH565 SERVICE MANUAL Indoor unit [Service Ref.] Note: [Model Name] • This manual describes service PLA-SP71BA.UK PLA-SP71BA data of the indoor units only. • RoHS compliant products have <G> mark on the spec PLA-SP100BA.UK name plate. PLA-SP100BA PLA-SP125BA.UK...

  • Page 2: Reference Manual

    REFERENCE MANUAL OUTDOOR UNIT’S SERVICE MANUAL Service Ref Service Manual No. OCH561 SUZ-SA71VA.TH OCB561 OCH566 PUHZ-SP100/120/140V(Y)HA OCB566 OCH565...

  • 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. In case of using the existing pipes for R22, be careful with If other refrigerant (R22 etc.) is used, chlorine in refrige- the followings.

  • Page 4: Parts 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 R410A refrigerant.

  • Page 5: Wireless Remote Controller

    3-2. WIRELESS REMOTE CONTROLLER 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. display SET TEMP.
  • Page 6 3-3. WIRED REMOTE CONTROLLER <PAR-31MAA> Wired remote controller function Function : Supported : Unsupported Body Product size H × W × D (mm) 120 × 120 × 19 Full Dot LCD Backlight Energy-saving Energy-saving operation schedule Automatic return to the preset temperature Restriction Setting the temperature range restriction Function...

  • Page 7: Basic Mode

    Room Set temp. Cool Auto Mode Temp. 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. <Full mode> <Basic 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 Filter information Error information Weekly timer Energy saving...
  • Page 9 Main menu list Setting and display items Setting details Vane · Louver · Vent. Use to set the vane angle. (Lossnay) • 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 Setting and display items Setting details Initial setting Display Make the settings for the remote controller related items as necessary. details Clock: The initial settings are "Yes" and "24h" format. Temperature: Set either Celsius (°C) or Fahrenheit (°F). Room temp. : Set Show or Hide. Auto mode: Set the Auto mode display or Only Auto display.

  • Page 11: Specifications

    SPECIFICATIONS Service Ref. PLA-SP71BA.UK Mode Cooling Heating Power supply (phase, cycle, voltage) Single phase, 50Hz, 230V Input 0.07 0.06 Running current 0.51 0.43 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 0.050...
  • Page 12 Service Ref. PLA-SP140BA.UK Mode Cooling Heating Power supply (phase, cycle, voltage) Single phase, 50Hz, 230V Input 0.16 0.15 Running current 1.07 1.00 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 0.120 Airflow (Low-Medium2-Medium1-High)

  • Page 13: Noise Criterion Curves

    NOISE CRITERION CURVES PLA-SP71BA.UK PLA-SP100BA.UK 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...

  • Page 14: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PLA-SP71BA.UK PLA-SP100BA.UK PLA-SP125BA.UK PLA-SP140BA.UK Unit: mm Ceiling hole 20~45 20~45 860~910 Detail connecting of branch duct(Both aspects) Fresh air Suspension bolt pitch intake hole Cut out hole Remote controller terminal block Indoor unit/Outdoor unit Branch duct hole...

  • Page 15: Wiring Diagram

    WIRING DIAGRAM PLA-SP71BA.UK PLA-SP100BA.UK PLA-SP125BA.UK PLA-SP140BA.UK [LEGEND] SYMBOL NAME SYMBOL NAME <Table 1> SW1 (MODEL SELECTION) INDOOR CONTROLLER BOARD FAN MOTOR CN2L CONNECTOR (LOSSNAY) VANE MOTOR MODELS Manufacture/Service CN32 CONNECTOR (REMOTE SWITCH) TERMINAL BLOCK (Indoor unit Power (option)) 1 2 3 4...

  • Page 16: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PLA-SP71BA.UK PLA-SP100BA.UK PLA-SP125BA.UK PLA-SP140BA.UK 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)

  • Page 17: Troubleshooting

    TROUBLESHOOTING 9-1. TROUBLESHOOTING <Check code display by self-diagnosis and actions to be taken for service (summary)> Present and past check 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 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> [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 flash pattern Approx. 2.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.
  • Page 20 • If the unit cannot be operated properly after test run, refer to the following table to find the cause. Symptom Cause Wired remote controller LED 1, 2 (PCB in outdoor unit) •For about 2 minutes following power-on,op- For about 2 After LED 1, 2 are lighted, LED 2 is PLEASE WAIT minutes after...
  • Page 21 9-3. SELF-DIAGNOSIS ACTION TABLE Check code Abnormal point and detection method Countermeasure Cause Room temperature thermistor (TH1) Defective thermistor Check resistance value of thermistor. 1 ~ 3 The unit is in 3-minute resume characteristics 0ºC···15.0k prevention mode if short/open of Contact failure of connector 10ºC····...
  • Page 22 Check code Abnormal point and detection method Countermeasure Cause Freezing/overheating protection is (Cooling or drying mode) (Cooling or drying mode) operating 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 Low-load (low temperature) prevention mode if pipe <liquid or...
  • Page 23 Check code Abnormal point and detection method Countermeasure Cause Condenser/ Evaporator temperature 1 Defective thermistor thermistor (TH5) characteristics 1~ Check resistance value of thermistor. The unit is in 3-minute resume protection Contact failure of connector For characteristics, refer to (P1) above. Check contact failure of connector (CN44) on mode if short/open of thermistor is (CN44) on the indoor controller...
  • Page 24 Abnormal point and detection method Countermeasure Check code Cause Indoor/outdoor unit communication 1 Contact failure, short circuit or, * Check LED display on the outdoor control error (Signal receiving error) circuit board. (Connect A-control service miswiring (converse wiring) of 1 Abnormal if indoor controller board tool, PAC-SK52ST.) indoor/outdoor unit connecting cannot receive any signal normally for 6...
  • Page 25 Abnormal point and detection method Countermeasure Cause Check code Abnormal refrigerant circuit When this error occurs, be sure to replace Abnormal operation of 4-way During Cooling, Dry, or Auto Cooling the 4-way valve. valve operation, when the following are Check refrigerant pipes for disconnection or Disconnection of or leakage in regarded as failures when detected for leakage.
  • Page 26 9-4. TROUBLESHOOTING OF PROBLEMS 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. 1 Power supply of rated voltage is not supplied to out 1 Check the voltage of outdoor power door unit.
  • Page 27 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 28: 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 29 9-6. HOW TO CHECK THE PARTS PLA-SP71BA.UK PLA-SP100BA.UK PLA-SP125BA.UK PLA-SP140BA.UK Parts name Check points Room temperature Disconnect the connector then measure the resistance with a tester. thermistor (TH1) (At the ambient temperature of 10 : to 30 :) Pipe temperature...
  • Page 30 9-6-1. Thermistor < Thermistor for lower temperature > <Thermistor Characteristic graph> Room temperature thermistor (TH1) Thermistor for Pipe temperature thermistor/liquid (TH2) lower temperature Condenser/evaporator temperature thermistor (TH5) Thermistor R =15kΩ ± 3% Fixed number of B=3480 ± 2% Rt=15exp { 3480( 273+t 0˚C 15 kΩ...
  • Page 31 9-7. TEST POINT DIAGRAM Indoor controller board PLA-SP71BA.UK PLA-SP100BA.UK PLA-SP125BA.UK PLA-SP140BA.UK CN3G Connect to the auto grille LED3 Vane motor output (MV) controller board (CN3G) Transmission (Indoor/outdoor) 12V pulse output 13V pulse output CN90 Connect to the wireless CN2L remote controller board...
  • Page 32 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. The black square (■) indicates a switch position Jumper wire ( : Short : Open) Jumper wire Setting by the dip switch and jumper wire Remarks Functions...

  • Page 33: Special Function

    SPECIAL FUNCTION 10-1. HOW TO PERFORM THE UP/DOWN OPERATION OF THE AIR INTAKE GRILLE 10-1-1. Setting up the lowering distance of air intake grille Unit You can set up 8 different stages of lowering distance for Decorative the air intake grille according to the set up location if desired. panel Note that, as a factory default, the decorative panel will automatically stop at 1.6 m from the ceiling surface.
  • Page 34 10-1-3. How to perform the up/down operation using wired remote controller (PAR-31MAA) Maintenance menu 1 Select "Maintenance" from the Main menu, and press the button. Auto descending panel Manual vane angle Select "Auto descending panel" with the F1 or F2 button, and press the button.
  • Page 35 10-2. OPERATION (AUTO DESCENDING PANEL: PLP-6BAJ) (1) Normal operation 1 UP/DOWN Wire 1b Air intake grille is raised/lowered by UP/DOWN UP/DOWN commands of UP and DOWN. Machine 2 Machine 1 Air intake grille does not move under the state of no-load detection or obstacle detection. Air intake grille stops automatically at the set lowering distance from the ceiling level.
  • Page 36 10-3. ELECTRICAL CIRCUIT (Controller board and wiring diagram (Panel)) 10-3-1. Dip SW 22 type SW22 Panel Indoor unit (WHT) LS21 CN3G CN90 (WHT) (BLK) CN2G (BLK) CN3G (BLK) FUSE CN22 (BLU) CN2F (BLK) CNAC (WHT) CN2E LS21 (RED) CN2C CN2B (WHT) GRN/YLW (WHT)
  • Page 37 10-3-3. Check point of trouble <LED (SW22 type) /LED2 (SW2 type) display> Turn OFF : No power supply Blink : Storage detection switch ON (short) One blink : Storage detection switch OFF (open) Two blinks : Tension detection switch OFF (open) <controller board>...
  • Page 38 10-5. ROTATION FUNCTION (AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION) 10-5-1. Operation (1) Rotation function (and Back-up function) • Outline of functions · Main and sub unit operate alternately according to the interval of rotation setting. Main and sub unit should be set by refrigerant address. (Outdoor Dip switch setting) Refrigerant address "00"...
  • Page 39 • System constraint · This function is available only in cooling mode. Ex.) Set temp. by R/C = 20°C [2nd stage cut-in function]··· Request code number "322~324" Set point = 26°C When request code number is “323”. Room temp. ] Set point Room temp.
  • Page 40 (2) Setting method of each function by wired remote controller (PAR-31MAA) 1 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 41: Disassembly Procedure

    DISASSEMBLY PROCEDURE PLA-SP71BA.UK PLA-SP100BA.UK PLA-SP125BA.UK PLA-SP140BA.UK 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 42 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Coil plate Photo 3 6. Removing the fan and fan motor (MF) (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 43 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Photo 8 10. 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 44 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN New publication, effective May 2014 Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Specifications are subject to change without notice. Distributed in May 2014 No.OCH565 Made in Japan...

This manual is also suitable for:

Pla-sp100ba.ukPla-sp125ba.ukPla-sp140ba.ukPla series

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