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Mitsubishi Electric PLA Series Service Manual
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Mitsubishi Electric PLA Series Service Manual

Indoor unit
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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Indoor unit
[Model names]
[Service Ref.]
PLA-ZRP35BA.UK
PLA-ZRP35BA
PLA-ZRP50BA.UK
PLA-ZRP50BA
PLA-ZRP60BA.UK
PLA-ZRP60BA
PLA-ZRP71BA.UK
PLA-ZRP71BA
PLA-ZRP125BA.UK
PLA-ZRP125BA
PLA-ZRP140BA.UK
PLA-ZRP140BA
Model name
indication
INDOOR UNIT
ON/OFF
TEMP
WIRELESS REMOTE
CONTROLLER
TEMP.
ON/OFF
WIRED REMOTE
CONTROLLER
CONTENTS
1. REFERENCE MANUAL ................................... 2
2. SAFETY PRECAUTION ................................... 3
3. PART NAMES AND FUNCTIONS ................... 4
4. SPECIFICATIONS ........................................... 12
5. NOISE CRITERION CURVES ......................... 14
6. OUTLINES AND DIMENSIONS ...................... 16
7. WIRING DIAGRAM ......................................... 17
9. TROUBLESHOOTING .................................... 19
10. SPECIAL FUNCTION ..................................... 35
11. DISASSEMBLY PROCEDURE ....................... 45
PARTS CATALOG (OCB535)
November 2012
No. OCH535
NOTE:
• This manual describes
only service data of the
indoor units.
• RoHS compliant prod-
ucts have <G> mark on
the spec name plate.

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  • Page 1: Table Of Contents

    SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS November 2012 No. OCH535 SERVICE MANUAL Indoor unit [Model names] [Service Ref.] PLA-ZRP35BA.UK PLA-ZRP35BA NOTE: • This manual describes only service data of the PLA-ZRP50BA.UK PLA-ZRP50BA indoor units. • RoHS compliant prod- ucts have <G>...

  • Page 2: Reference Manual

    REFERENCE MANUAL OUTDOOR UNIT’S SERVICE MANUAL Service Ref. Service Manual No. PUHZ-ZRP35/50VKA PUHZ-ZRP60/71VHA OCH527/OCB527 PUHZ-ZRP125/140VKA PUHZ-ZRP125/140YKA OCH535...

  • 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 a vacuum pump with a reverse flow check Use new refrigerant pipes. valve.

  • Page 4: Part Names And Functions

    Unit Gravimeter [3] Service tools Use the below service tools as exclusive tools for R410A refrigerant. Tool name Specifications Gauge manifold · Only for R410A · Use the existing fitting specifications . (UNF1/2) · Use high-tension side pressure of 5.3MPa·G or over. Charge hose ·...
  • Page 5 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-30MAA / PAR-31MAA> Wired remote controller function * The functions which can be used are restricted according to the model. : Supported : Unsupported PAR-30MAA / PAR-31MAA Function PAR-21MAA Slim City multi Body Product size H × W × D (mm) 120 ×...
  • Page 7 The main display can be displayed in two different modes: "Full" and "Basic". The factory setting is "Full". To switch to the "Basic" mode, change the setting on the Main display setting. <Full mode> <Basic mode> * All icons are displayed for explanation. Cool Set temp.
  • 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 fi ve different settings. Use to turn ON / OFF the louver. •...
  • 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 factory 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 3-4. WIRED REMOTE CONTROLLER <PAR-21MAA> “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 12: Specifications

    SPECIFICATIONS Service Ref. PLA-ZRP35BA.UK Mode Cooling Heating Power supply (phase, cycle, voltage) Single phase, 50Hz, 230V Input 0.04 0.03 Running current 0.28 0.25 External finish (Panel) Munsell 6.4Y 8.9/0.4 Heat exchanger Plate fin coil Fan (drive) Turbo fan (direct) Fan motor output 0.050 Airflow (Low-Medium2-Medium1-High) /min(CFM)
  • Page 13 Service Ref. PLA-ZRP71BA.UK Mode Cooling Heating Power supply (phase, cycle, voltage) Single phase, 50Hz, 230V Input 0.05 0.04 Running current 0.45 0.41 External finish (Panel) Munsell 6.4Y 8.9/0.4 Heat exchanger Plate fin coil Fan (drive) Turbo fan (direct) Fan motor output 0.120 Airflow (Low-Medium2-Medium1-High) /min(CFM)

  • Page 14: Noise Criterion Curves

    NOISE CRITERION CURVES PLA-ZRP35BA.UK PLA-ZRP50BA.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 CONTINUOUS NOISE NOISE...
  • Page 15 PLA-ZRP125BA.UK PLA-ZRP140BA.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 CONTINUOUS NOISE NOISE 1000 2000 4000...

  • Page 16: Outlines And Dimensions

    OUTLINES AND DIMENSIONS PLA-ZRP35BA.UK PLA-ZRP50BA.UK PLA-ZRP60BA.UK PLA-ZRP71BA.UK PLA-ZRP125BA.UK PLA-ZRP140BA.UK Ceiling hole Unit: mm 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 connecting terminal block Branch duct hole 14- 2.8...

  • Page 17: Wiring Diagram

    WIRING DIAGRAM PLA-ZRP35BA.UK PLA-ZRP50BA.UK PLA-ZRP60BA.UK PLA-ZRP71BA.UK PLA-ZRP125BA.UK PLA-ZRP140BA.UK [LEGEND] SYMBOL NAME SYMBOL NAME INDOOR CONTROLLER BOARD FAN MOTOR CN2L CONNECTOR (LOSSNAY) VANE MOTOR CN32 CONNECTOR (REMOTE SWITCH) TERMINAL BLOCK (Indoor unit Power (option)) CN41 CONNECTOR (HA TERMINAL-A) TERMINAL BLOCK (INDOOR/OUTDOOR CONNECTING LINE) TERMINAL BLOCK (REMOTE CONTROLLER CN51 CONNECTOR (CENTRALLY CONTROL)

  • Page 18: Refrigerant System Diagram

    REFRIGERANT SYSTEM DIAGRAM PLA-ZRP35BA.UK PLA-ZRP50BA.UK PLA-ZRP60BA.UK PLA-ZRP71BA.UK PLA-ZRP125BA.UK PLA-ZRP140BA.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) Strainer (#50) Distributor...

  • Page 19: Troubleshooting

    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 20 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 21 • 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 22 • On 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. • If the unit cannot be operated properly after test run, refer to the following table to find the cause. Symptom Cause Wired remote controller...
  • Page 23 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 1 Defective thermistor 1–3 Check resistance value of thermistor. Room temperature thermistor (TH1) 1 The unit is in 3-minute resume characteristics...
  • Page 24 Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is oper- (Cooling or drying mode) (Cooling or drying mode) ating 1 Clogged filter (reduced airflow) 1 Check clogs of the filter. 1 Freezing protection (Cooling mode) 2 Short cycle of air path 2 Remove blockage.
  • Page 25 Abnormal point and detection method Countermeasure Error 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. 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 Error Code Cause 1 Contact failure, short circuit or, Indoor/outdoor unit communication * Check LED display on the outdoor control circuit board. (Connect A-control service error (Signal receiving error) 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 27 Abnormal point and detection method Countermeasure Error Code Cause Abnormal refrigerant circuit 1 When this error occurs, be sure to replace 1 Abnormal operation of 4-way During Cooling, Dry, or Auto Cooling the 4-way valve. valve operation, when the following are 2 Check refrigerant pipes for disconnection or 2 Disconnection of or leakage in regarded as failures when detected for...
  • Page 28 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 29 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 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-ZRP35BA.UK PLA-ZRP50BA.UK PLA-ZRP60BA.UK PLA-ZRP71BA.UK PLA-ZRP125BA.UK PLA-ZRP140BA.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 ~30 ) Pipe temperature Normal Abnormal thermistor/liquid(TH2)
  • Page 32 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 =15k' ± 3% Fixed number of B=3480 ± 2% Rt=15exp { 3480( 273+t 15k' 9.6k'...
  • Page 33 9-7. TEST POINT DIAGRAM Indoor controller board PLA-ZRP35BA.UK PLA-ZRP50BA.UK PLA-ZRP60BA.UK PLA-ZRP71BA.UK PLA-ZRP125BA.UK PLA-ZRP140BA.UK LED3 Transmission (Indoor/outdoor) CN3G Connect to the auto grille controller board (CN3G) CN90 13V pulse output Connect to the wireless remote controller board Vane motor output (MV) (CNB) 12V pulse output CN4Y...
  • Page 34 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 Functions Remarks...

  • Page 35: 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 * As a factory default, the decorative panel will automatically stop at 1.6 m from the ceiling level.
  • Page 36 10-1-2. How to perform the up/down operation using wireless remote controller Ensure that the air-conditioner is not running. Warning: • Otherwise, it may cause an injury or a failure. 1) Ensure that the air-conditioner is not running. 2) Press the "Down" button to lower the air intake grille. * By default, the air intake grille will automatically stop at a lowering distance of 1.6 m from the ceiling level.
  • Page 37 10-1-4. How to perform the up/down operation using wired remote controller (PAR-21MAA) ■General Operation * Raise or lower all the air intake grilles managed by the remote controller at the same time. Install the remote controller in a place where you can observe all the air-conditioners. Otherwise, the lowering grille may make contact with something and cause damage to it.
  • Page 38 ■ Up/down operation with the individual specified air-conditioner (when used in combination with Mr. SLIM model) * Raise or lower the air intake grille of the specific air-conditioner that you select from all that are managed by that remote controller. 1) Ensure that the air-conditioner is not running.
  • Page 39 10-2. OPERATION (AUTO DESCENDING PANEL: PLP-6BAJ) (1) Normal operation 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 40 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) CN2B CN2C (WHT) GRN/YLW (WHT)
  • Page 41 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 42 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 43 • 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 44 (3) Rotation and back up operation PAR-30MAA/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 •...

  • Page 45: Disassembly Procedure

    DISASSEMBLY PROCEDURE PLA-ZRP35BA.UK PLA-ZRP50BA.UK PLA-ZRP60BA.UK PLA-ZRP71BA.UK PLA-ZRP125BA.UK PLA-ZRP140BA.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 46 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 47 OPERATING PROCEDURE PHOTOS & ILLUSTRATIONS Photo 8 10. Removing the drain pump (DP) and float switch (FS) (1) Remove the drain pan. (See Photo 6) Float switch (2) Cut the hose band and remove the hose. (3) Remove the drain pump assembly (3 screws and 2 hooks). Hose band (4) Remove the drain pump (3 screws).
  • Page 48 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN CCopyright 2012 MITSUBISHI ELECTRIC CORPORATION New publication, effective Nov. 2012 Distributed in Nov. 2012 No.OCH535 Specifications are subject to change without notice. Made in Japan...
  • Page 49 Related Links Model Number: PLA-ZRP60BA PAC-SH51SP-E Installation Manual PLA-ZRP35-140 Service Manual OCH535 PLA-ZRP35-140 Parts Catalog OCB535 PLA-ZRP35-140 Instruction Book PLA-ZRP35-140 Installation Manual BH79D045K05 PLA-ZRP35-100 Declaration of Conformity PLA-ZRP & PLA-RP Installation Manual (RG79D506K04)

This manual is also suitable for:

Pla-zrp35baPla-zrp50baPla-zrp60baPla-zrp71baPla-zrp125baPla-zrp140ba ... Show all

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