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Mitsubishi Electric PLA-SM71EA.UK Service Manual
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Mitsubishi Electric PLA-SM71EA.UK Service Manual

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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Indoor unit
[Model Name]
[Service Ref.]
PLA-SM71EA.UK
PLA-SM71EA
PLA-SM100EA.UK
PLA-SM100EA
PLA-SM125EA.UK
PLA-SM125EA
PLA-SM140EA.UK
PLA-SM140EA
Grille model
[Model Name]
[Service Ref.]
PLP-6EA
PLP-6EA
PLP-6EAL
PLP-6EAL
PLP-6EAJ
PLP-6EAJ
PLP-6EALM
PLP-6EALM
Model name
indication for
MAIN UNIT
INDOOR UNIT
OCH683
PLP-6EAR1
PLP-6EALR1
CONTENTS
1. REFERENCE MANUAL ................................... 2
2. SAFETY PRECAUTION ................................... 3
3. PARTS NAMES AND FUNCTIONS ................. 9
4. SPECIFICATIONS ........................................... 14
5. NOISE CRITERION CURVES ......................... 16
6. OUTLINES AND DIMENSIONS ...................... 17
7. WIRING DIAGRAM ......................................... 18
Model name
indication for GRILLE
9. TROUBLESHOOTING .................................... 20
10. SPECIAL FUNCTION ..................................... 35
11. DISASSEMBLY PROCEDURE ....................... 41
R32/R410A
Notes:
• This manual describes ser-
vice data of the indoor units
only.
• RoHS compliant products
have <G> mark on the spec
name plate.
PARTS CATALOG (OCB683)
December 2017
No. OCH683

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  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS December 2017 No. OCH683 SERVICE MANUAL R32/R410A Indoor unit [Model Name] [Service Ref.] PLA-SM71EA.UK Notes: PLA-SM71EA • This manual describes ser- PLA-SM100EA.UK PLA-SM100EA vice data of the indoor units PLA-SM125EA.UK only. PLA-SM125EA •...

  • Page 2: Reference Manual

    REFERENCE MANUAL OUTDOOR UNIT’S SERVICE MANUAL Model Name Service Ref. Service Manual No. SUZ-SA71/100VA3 SUZ-SA71/100VA3.TH PUHZ-SP100/125/140YKA PUHZ-SP100/125/140YKA.TH OCH/OCB671 PUHZ-SP125/140VKA PUHZ-SP125/140VKA.TH OCH683...

  • Page 3: Safety Precaution

    SAFETY PRECAUTION MEANINGS OF SYMBOLS DISPLAYED ON THE UNIT This mark is for R32 refrigerant only. Refrigerant type is written on nameplate of outdoor unit. WARNING Read the OPERATION MANUAL carefully before operation. Service personnel are required to carefully read the OPERATION MANUAL and INSTALLATION MANUAL before operation. Further information is available in the OPERATION MANUAL, INSTALLATION MANUAL, and the like.
  • Page 4 [1] Warning for service (1) Do not alter the unit. (2) For installation and relocation work, follow the instructions in the Installation Manual and use tools and pipe components specifically made for use with refrigerant specified in the outdoor unit installation manual. (3) Ask a dealer or an authorized technician to install, relocate and repair the unit.
  • Page 5 [4] Cautions for unit using R32 refrigerant Basic work procedures are the same as those for conventional units using refrigerant R410A. However, pay careful attention to the following points. (1) Information on servicing (1-1) Checks on the Area Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of ignition is minimized.
  • Page 6 (3) Repair to intrinsically Safe Components Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that this will not exceed the permissible voltage and current permitted for the equipment in use. Intrinsically safe components are the only types that can be worked on while live in the presence of a flammable atmos- phere.
  • Page 7 a) Become familiar with the equipment and its operation. b) Isolate system electrically. c) Before attempting the procedure, ensure that: • mechanical handling equipment is available, if required, for handling refrigerant cylinders; • all personal protective equipment is available and being used correctly; •...
  • Page 8 Unit Electronic weighing scale [5] Service tools Use the below service tools as exclusive tools for R32/R410A refrigerant. Refer to the spec name plate on outdoor unit for the type of refrigerant being used. Tool name Specifications Gauge manifold · Use the existing fitting specifications . (UNF1/2) ·...

  • Page 9: Parts Names And Functions

    PARTS NAMES AND FUNCTIONS Drain pipe 3-1. INDOOR UNIT Air outlet Filter Liquid pipe Gas pipe Signal receiver (Option) Vane Air intake (Intake grille) OCH683...
  • Page 10 3-2. WIRELESS REMOTE CONTROLLER (Option) The functions which can be used are restricted according to each model. Transmission area Not available Remote controller display Battery replacement indicator Set Temperature buttons OFF/ON button Mode button (Changes operation mode) Fan Speed button (Changes fan speed) Airflow button (Changes up/down airflow direction) i-see button Timer ON button...
  • Page 11 3-3. Wired remote controller (Option) PAR-32MAA The functions which can be used are restricted according to each model. The main display can be displayed in 2 different modes: "Full" and "Basic." Display The initial setting is "Full." 1 Operation mode Indoor unit operation mode appears here.
  • Page 12 Menu structure Press the button. MENU Move the cursor to the desired item with the buttons, and press the button. Main menu SELECT 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 13 Setting and display items Setting details Vane · Louver · Vent. Use to set the vane angle. • Select a desired vane setting from 5 different settings. (Lossnay) Use to turn ON/OFF the louver. • Select a desired setting from "ON" and "OFF." Use to set the amount of ventilation.

  • Page 14: Specifications

    SPECIFICATIONS Service Ref. PLA-SM71EA.UK Mode Cooling Heating Power supply (phase, cycle, voltage) Single phase, 50Hz, 230 V Input 0.04 0.04 Running current 0.27 0.25 External finish (Grille) Munsell 1.0Y 9.2/0.2 Heat exchanger Plate fin coil Fan (drive) o No. Turbo fan (direct) o 1 Fan motor output 0.05...
  • Page 15 Service Ref. PLA-SM140EA.UK Mode Cooling Heating Power supply (phase, cycle, voltage) Single phase, 50Hz, 230 V Input 0.10 0.10 Running current 0.66 0.64 External finish (Grille) Munsell 1.0Y 9.2/0.2 Heat exchanger Plate fin coil Fan(drive) o No. Turbo fan (direct) o 1 Fan motor output 0.120 K/min...

  • Page 16: Noise Criterion Curves

    NOISE CRITERION CURVES PLA-SM71EA.UK NOTCH SPL(dB) LINE PLA-SM100EA.UK 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 17: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PLA-SM71EA.UK PLA-SM100EA.UK PLA-SM125EA.UK PLA-SM140EA.UK Unit: mm OCH683...

  • Page 18: Wiring Diagram

    WIRING DIAGRAM PLA-SM71EA.UK PLA-SM100EA.UK PLA-SM125EA.UK PLA-SM140EA.UK [LEGEND] <Table 1> SW1 (MODEL SELECTION) SYMBOL NAME SYMBOL NAME MODELS Manufacture/Service INDOOR CONTROLLER BOARD TERMINAL BLOCK (INDOOR/OUTDOOR 1 2 3 4 5 6 PLA- CN2L CONNECTOR (LOSSNAY) CONNECTING LINE) SM.EA CN32 CONNECTOR (REMOTE SWITCH)

  • Page 19: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PLA-SM71EA.UK PLA-SM100EA.UK PLA-SM125EA.UK PLA-SM140EA.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...

  • Page 20: 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 or controller 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 21 Refer to the following tables for details on the check codes. [Output pattern A] Beeper sounds Beep Beep Beep Beep Beep Beep Beep 1 st 2 nd 3 rd n th 1 st 2 nd OPERATION · · · Repeated INDICATOR lamp blinking pattern...
  • Page 22 • 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 • For about 2 minutes after power-on,operation of the For about 2 minutes after power-on PLEASE WAIT remote controller is not possible due to system startup.
  • Page 23 Note: 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. 9-3. SELF-DIAGNOSIS ACTION TABLE Please refer to the outdoor unit's service manual for the details. Abnormal point and detection method Countermeasure Check code...
  • Page 24 Abnormal point and detection method Countermeasure Check code Cause 1 Malfunction of drain pump 1 Check if drain pump works. Drain pump lock protection operation 2 Clogged drain pump 1 Error postponement, if drain pump stops 2 Check if drain pump works. 3 Contact failure of connector for 5 seconds continuously while drain 3 Check contact failure of connector CNP...
  • Page 25 Abnormal point and detection method Countermeasure Check code Cause 1 Defective thermistor Pipe temperature thermistor/ characteristics 1–3 Check resistance value of thermistor. Condenser-Evaporator (TH5) For characteristics, refer to (P1) above. 1 The unit is in 3-minute resume protec- 2 Contact failure of connector 2 Check contact failure of connector (CN44) tion mode if short/open of thermistor is (CN44) on the indoor controller...
  • Page 26 Abnormal point and detection method Countermeasure Check code Cause 1 Contact failure, short circuit or, Note: Check LED display on the outdoor control Indoor/outdoor unit communication circuit board. (Connect A-control service miswiring (converse wiring) of error (Signal receiving error) 1 Abnormal if indoor controller board tool, PAC-SK52ST.) indoor/outdoor unit connecting cannot receive any signal normally for 6...
  • Page 27 Abnormal point and detection method Countermeasure Check code Cause 1 Defective fan motor 12 Refer to "9-6-2. DC Fan Motor (FAN Fan motor trouble 2 Defective indoor controller board MOTOR/INDOOR CONTROLLER BOARD)". Abnormal refrigerant circuit 1 Abnormal operation of 4-way 1 When this error occurs, be sure to replace During Cooling, Dry, or Auto Cooling valve...
  • Page 28 9-4. TROUBLESHOOTING OF PROBLEMS Note: Refer to the outdoor unit's service manual for the detail of remote controller. Phenomena Cause Countermeasure (1) LED2 on indoor controller board is off. • When LED1 on indoor controller board is also off. 1 Power supply of rated voltage is not sup- 1 Check the voltage of outdoor power supply plied to outdoor unit.
  • Page 29 Note: Refer to the outdoor unit's service manual for the detail of remote controller. Phenomena Cause Countermeasure • When LED1 on indoor controller board is also blinking. Check indoor/outdoor unit connecting wire (2) LED2 on indoor controller board Connection failure of indoor/outdoor unit connecting for connection failure.
  • Page 30 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 31 9-6. HOW TO CHECK THE PARTS PLA-SM71EA.UK PLA-SM100EA.UK PLA-SM125EA.UK PLA-SM140EA.UK Parts name Check method and criterion Room temperature Measure the resistance with a tester. thermistor (TH1) (Parts temperature 10 to 30°C) Pipe temperature Abnormal Normal thermistor/liquid (TH2) Opened or short-circuited 4.3 to 9.6 k"...
  • Page 32 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% Rt=15exp { 3480( 273+t 15 k"...
  • Page 33 9-7. TEST POINT DIAGRAM Indoor controller board PLA-SM71EA.UK PLA-SM100EA.UK PLA-SM125EA.UK PLA-SM140EA.UK Vane motor (MV) Connect to wired remote controller 12 V pulse output 10.4-14.6 V DC Model selection CN90 J41, J42 Connect to the wireless remote controller board (CNB) Jumper wire (Pair No.
  • Page 34 9-8. FUNCTIONS OF DIP SWITCH AND JUMPER WIRE Each function is controlled by the DIP switch and the jumper wire on the indoor controller board. The black square (■) indicates a switch position Jumper wire ( : Short : Open) Jumper wire Setting by the DIP switch and jumper wire Functions...

  • Page 35: Special Function

    SPECIAL FUNCTION 10-1. OPERATION (AUTOMATIC FILTER ELEVATION GRILLE: PLP-6EAJ) (1) Normal operation String 1b 1 UP/DOWN UP/DOWN UP/DOWN Air intake grille is raised/lowered by Machine 1 Machine 2 commands of UP and DOWN. Air intake grille does not move under the state of no-load detection or obstacle detection.
  • Page 36 10-2. ELECTRICAL CIRCUIT (Controller board and wiring diagram (Panel)) 10-2-1 DIP SW LED4 LED2 [ LEGEND ] SYMBOL NAME [EMERGENCY OPERATION] ELEVATION PANEL CONTROLLER BOARD 1. If the wireless remote controller for ELEVATION PANEL is faulty or lost, operation LED ORANGE LED2 (INTAKE GRILLE CONDITION (See table *1)) will be possible using the emergency up/down switch at the wireless signal receiver...
  • Page 37 10-3. TROUBLESHOOTING • Check the following points. Problem Possible Reason Corrective Action Intake grille does not function Air-conditioner is running. Stop running the air-conditioner and try again. After recovering from power failure, try again. Power failure. with operation of the remote Batteries are not inserted into the wireless remote Install or replace the battery.
  • Page 38 10-4. ROTATION FUNCTION (AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION) 10-4-1. Operation (1) Rotation function (and Back-up function) • Outline of functions · Main and sub unit operate alternately according to the interval of rotation setting. Note: 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: [2nd stage cut-in function]··· Request code number "322–324" Set point = 26: When request code number is “323”. Room temp. ] Set point Room temp.
  • Page 40 (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 41: Disassembly Procedure

    DISASSEMBLY PROCEDURE PLA-SM71EA.UK PLA-SM100EA.UK PLA-SM125EA.UK PLA-SM140EA.UK Be careful when removing heavy parts. OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Knob Air intake grille 1. Removing the filter (1) Slide the knob of air intake grille toward the arrow to Figure 1 Grille open the air intake grille.
  • Page 42 OPERATING PROCEDURE PHOTOS 4. Removing the room temperature thermistor (TH1) Photo 3 (1) Remove the electrical box cover. (See Photo 1 and 2) (2) Disconnect the connector CN20 (Red) from the indoor Electrical box Thermistor (TH1) controller board. Indoor controller (3) Remove the room temperature thermistor with its CN20 board...
  • Page 43 Be careful when removing heavy parts. OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Bell mouth fixing screws 6. Removing the electrical box Photo 5 (1) Remove the electrical box cover (See Photo 1 and 2) and the connectors (Refer to procedure 5). Bell mouth (2) Remove the electrical box fixing screws (M5×10: 2 screw).
  • Page 44 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 9. Removing the panel Figure 4 (1) Remove the electrical box fixing cover. (See Photo 1) Corner panel (2) Disconnect the connector for vane motor (CNV: White). Screw (Refer to procedure 5) (3) Loosen the 4 corner panel fixing screws (tapping screw ①...
  • Page 45 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS 11. Removing the pipe temperature/liquid thermistor (TH2) Photo 13 and condenser/evaporator temperature thermistor (TH5) (1) Remove the drain pan (Refer to procedure 10) and loosen the 2 clamps of the coil plate. (See Photo 9) (2) Remove the coil plate (tapping screw 4×10: 2 screws).
  • Page 46 OPERATING PROCEDURE PHOTOS Do not hold this floating part Photo 15 13. Removing the float switch (FS) when lifting; Doing so will cause (1) Remove the drain pan. (Refer to procedure 10) malfunction. (2) Loosen the clamp of the drain pump. (See Photo 14) (3) Remove the float switch (tapping screw 4×10: 1 screw/1 hook).
  • Page 47 OCH683...
  • Page 48 HEAD OFFICE : TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2017 MITSUBISHI ELECTRIC CORPORATION Published: Dec. 2017 No.OCH683 Specifications are subject to change without notice. Made in Japan...
  • Page 49 Related Links Model Number: PLA-SM125EA PLA-SM R32 Inverter Product Information Sheet PLA-SM-R32 Inverter Product Information Sheet PLA-SM125-140EA Declaration of Conformity PLA-SM71-140EA Installation Manual (RG79F077K04) PLA-SM71-140EA Instruction Book (RG79F077H03) PLA-SM71-140EA Parts Catalogue (OCB683) PLA-SM71-140EA Service Manual (OCH683)

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