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SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SPLIT-TYPE, AIR CONDITIONERS
SERVICE MANUAL
Indoor unit
[Model Name]
PKA-M35LA2
PKA-M35LA2-ER
PKA-M35LA2-ET
PKA-M50LA2
PKA-M50LA2-ER
PKA-M50LA2-ET
PKA-M35LAL2
PKA-M35LAL2-ER
PKA-M35LAL2-ET
PKA-M50LAL2
PKA-M50LAL2-ER
PKA-M50LAL2-ET
TCH068.indd 1
TCH068.indd 1
[Service Ref.]
PKA-M35LA2.TH
PKA-M35LA2-ER.TH
PKA-M35LA2-ET.TH
PKA-M50LA2.TH
PKA-M50LA2-ER.TH
PKA-M50LA2-ET.TH
PKA-M35LAL2.TH
PKA-M35LAL2-ER.TH
PKA-M35LAL2-ET.TH
PKA-M50LAL2.TH
PKA-M50LAL2-ER.TH
PKA-M50LAL2-ET.TH
INDOOR UNIT
September 2021
R32/R410A
CONTENTS
1. REFERENCE MANUAL ······················· 2
2. SAFETY PRECAUTION ······················· 2
3. PARTS NAMES AND FUNCTIONS ········ 8
4. SPECIFICATIONS ······························ 9
5. NOISE CRITERION CURVES ············· 10
6. OUTLINES AND DIMENSIONS ··········· 11
7. WIRING DIAGRAM ··························· 12
9. TROUBLESHOOTING ······················· 14
10. FUNCTION SETTING ························ 29
11. SPECIAL FUNCTION ························ 30
12. DISASSEMBLY PROCEDURE ············ 32
13. REMOTE CONTROLLER ··················· 36
PARTS CATALOG (TCB068)
No. TCH068
1/10/2564 9:00:26
1/10/2564 9:00:26
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Related Manuals for Mitsubishi Electric Mr.SLIM PKA-M35LA2
Summary of Contents for Mitsubishi Electric Mr.SLIM PKA-M35LA2
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Page 1: Table Of Contents
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SPLIT-TYPE, AIR CONDITIONERS September 2021 No. TCH068 SERVICE MANUAL R32/R410A Indoor unit [Model Name] [Service Ref.] PKA-M35LA2.TH PKA-M35LA2 PKA-M35LA2-ER.TH PKA-M35LA2-ER PKA-M35LA2-ET.TH PKA-M35LA2-ET PKA-M50LA2.TH PKA-M50LA2 PKA-M50LA2-ER.TH PKA-M50LA2-ER PKA-M50LA2-ET.TH PKA-M50LA2-ET PKA-M35LAL2.TH PKA-M35LAL2 PKA-M35LAL2-ER.TH PKA-M35LAL2-ER PKA-M35LAL2-ET.TH PKA-M35LAL2-ET PKA-M50LAL2.TH PKA-M50LAL2 PKA-M50LAL2-ER.TH PKA-M50LAL2-ER... -
Page 2: Reference Manual
REFERENCE MANUAL OUTDOOR UNIT’S SERVICE MANUAL Model name Service manual No. Parts catalog No. PUHZ-ZRP35VKA2 OCH635A PUHZ-ZRP50VKA2 OCB635A PUHZ-ZRP71VHA2 PUHZ-ZRP100V(Y)KA3 OCH645D PUHZ-ZRP140V(Y)KA3 OCB645C PUHZ-ZRP200YKA2 OCH647 PUHZ-P200YKA2 OCB647A PUHZ-P100V(Y)KA OCH670B PUHZ-P140V(Y)KA OCB670 PUZ-ZM35VKA2 OCH751 PUZ-ZM50VKA2 OCB751 PUZ-ZM71VHA2 PUZ-ZM100V(Y)KA2 OCH771 PUZ-ZM140V(Y)KA2 OCB771 PUZ-ZM200YKA2 PUZ-M100V(Y)KA2 OCH773... - Page 3 2-2. CAUTIONS RELATED TO NEW REFRIGERANT Cautions for units utilising refrigerant R32/R410A Precautions during the repair service. Preparation before the repair service. • Prepare the proper tools. • Do not perform the work involving the electric parts • Prepare the proper protectors. with wet hands.
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Page 4: Cautions For Service
[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 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; • the recovery process is supervised at all times by a competent person; •...
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Page 8: Service Tools
Unit Electronic weighing scale [5] Service tools Use the below service tools as exclusive tools for R32/R410A refrigerant. Tool name Specifications · Use the existing fitting specifications . (UNF1/2) Gauge manifold · Use high-tension side pressure of 5.3MPa·G or over. Charge hose ·... -
Page 9: Specifications
SPECIFICATIONS Service Ref. PKA-M35LA2(-ER/ET).TH PKA-M50LA2(-ER/ET).TH PKA-M35LAL2(-ER/ET).TH PKA-M50LAL2(-ER/ET).TH Mode Cooling Heating Power supply (phase, voltage, cycle) Single phase, 230V, 50Hz Input 0.04 0.03 Running current 0.35 0.30 External finish (Panel) Munsell 0.7PB 9.2/0.4 Heat exchanger Plate fin coil Fan Fan (drive) × No. Line flow fan (direct) ×... -
Page 10: Noise Criterion Curves
NOISE CRITERION CURVES 5-1. SOUND LEVELS Sound level at anechoic room : Low-Middle2-Middle1-High Model Sound level dB (A) Main unit PKA-M35/50LA(L) 34 - 37- 40 - 43 Wall 1.0m Measurement location * Measured in anechoic room. 5-2. NOISE CRITERION CURVES LINE High Medium 1... -
Page 11: Outlines And Dimensions
OUTLINES AND DIMENSIONS Unit: mm TCH068 TCH068.indd 11 TCH068.indd 11 1/10/2564 9:00:29 1/10/2564 9:00:29... -
Page 12: Wiring Diagram
WIRING DIAGRAM TCH068 TCH068.indd 12 TCH068.indd 12 1/10/2564 9:00:30 1/10/2564 9:00:30... -
Page 13: Refrigerant System Diagram
REFRIGERANT SYSTEM DIAGRAM Strainer (#50) Heat exchanger Refrigerant GAS pipe connection (Flare) Thermistor TH2 Refrigerant flow in cooling (Pipe temperature/liquid) Refrigerant flow in heating Thermistor TH5 (Cond./ Eva.temperature) Refrigerant LIQUID pipe connection (Flare) Thermistor TH1 (Room temperature) Strainer (#100) Distributor with strainer (#100/#50) TCH068 TCH068.indd 13... -
Page 14: 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 15: Error Code
9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER Refer to "13-7. SELF-DIAGNOSIS" to search for the error history. Error code [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... - Page 16 Notes: 1. If the beeper does not sound again after the initial 2 beeps to confirm the self-check start signal was received and the OPERATION INDICATOR lamp does not come on, there are no error records. 2. If the beeper sounds 3 times continuously “beep, beep, beep (0.4 + 0.4 + 0.4 seconds)” after the initial 2 beeps to confirm the self-check start signal was received, the specified refrigerant address is incorrect.
- Page 17 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. Please refer to the out- 9-3. SELF-DIAGNOSIS ACTION TABLE door unit's service manual for the details. Abnormal point and detection method Countermeasure Check code...
- Page 18 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 19 Abnormal point and detection method Countermeasure Check code Cause Pipe temperature thermistor/ Condenser-Evaporator (TH5) 1–3 Check resistance value of thermistor. 1 Defective thermistor For characteristics, refer to (P1). 1 The unit is in 3-minute resume protec- characteristics 2 Check contact failure of connector (CN44) tion mode if short/open of thermistor is 2 Contact failure of connector on the indoor controller board.
- Page 20 Abnormal point and detection method Countermeasure Check code Cause Remote controller transmission error(E3)/signal receiving error(E5) 1 2 remote controllers are set as 1 Set a remote controller to main, and the 1 Abnormal if remote controller could not “main.” other to sub. find blank of transmission path for 6 sec- (In case of 2 remote con- onds and could not transmit.
- Page 21 Abnormal point and detection method Countermeasure Check code Cause Forced compressor stop 1 Drain pump trouble 1 Check the drain pump. (due to water leakage abnormality) 1 The unit has a water leakage abnor- 2 Defective drainage 2 Check whether water can be drained. mality when the following conditions, a) ·...
- Page 22 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 • 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 23 Note: Refer to the outdoor unit's service manual for the detail of remote controller. Phenomena Cause Countermeasure (2)LED2 on indoor controller board • When LED1 on indoor controller board is also blinking. is blinking. 1 Connection failure of indoor/outdoor unit connecting 1 Check indoor/outdoor unit connecting wire wire for connection failure.
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Page 24: 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 controller malfunctions, the emergency operation can be done using the emergency buttons on the grille. -
Page 25: How To Check The Parts
9-6. HOW TO CHECK THE PARTS Parts name Checkpoints Room temperature Disconnect the connector then measure the resistance with a multimeter. thermistor (TH1) Pipe temperature Refer to “9-6-1. Thermistor”. thermistor/liquid(TH2) Condenser/evaporator temperature thermistor (TH5) Vane motor (MV) Measure the resistance between the terminals with a multimeter . (At the ambient temperature 25°C) Normal Sky Blue Sky Blue... - Page 26 9-6-2. DC Fan motor (fan motor/indoor controller circuit board) Check method of DC fan motor (fan motor/indoor controller circuit board) 1 Notes · High voltage is applied to the connector (CNMF) for the fan motor. Pay attention to the service. ·...
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Page 27: Test Point Diagram
9-7. TEST POINT DIAGRAM Indoor controller board CNP Drain pump output CN2L 1–3: 13 VDC Connector (option) (LOSSNAY) CNMF LED1: Power Connect to the supply (I.B) fan motor (MF) 1–3 : 310–340 VDC 4–3 : 15 V DC 5–3 : 0–6.5 VDC CN105 6–3 : 0 or 15 VDC IT Terminal... - Page 28 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 Setting by the DIP switch and jumper wire Functions Remarks MODELS...
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Page 29: Function Setting
FUNCTION SETTING UNIT FUNCTION SETTING BY THE REMOTE CONTROLLER Each function can be set as necessary using the remote controller. The setting of function for each unit can only be done by the remote controller. (1) Functions available when setting the unit number to "Grp." Refer to the service manual that comes with each outdoor unit. -
Page 30: Special Function
SPECIAL FUNCTION 11-1. ROTATION FUNCTION(AND BACK-UP FUNCTION, 2ND STAGE CUT-IN FUNCTION) Connect optional wired remote controller through Terminal Block kit (PAC-SH29TC-E) to PKA type. 11-1-1. 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. - Page 31 • System constraint · This function is available only in cooling mode. Ex.) Set temp. by R/C = 20: [2nd stage cut-in function]··· Set point = 26: Room temp. ] Set point Room temp. < Set point -4: Start operation Sub unit start operation Sub unit stop Main...
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Page 32: Disassembly Procedure
DISASSEMBLY PROCEDURE Be careful when removing heavy parts. NOTE: Turn OFF the power supply before assembly. OPERATION PROCEDURE PHOTOS/FIGURES 1. REMOVING THE PANEL Photo 1 VANE UPPER shaft VANE UPPER Front panel (1) Insert the driver to the hole at VANE LOWER shaft and VANE LOWER VANE LOWER shaft slide the VANE LOWER shaft (2 places each). - Page 33 OPERATION PROCEDURE PHOTOS/FIGURES 3. REMOVING THE INDOOR CONTROLLER BOARD, Photo 4 THE WIRELESS REMOTE CONTROLLER BOARD Holder of wireless remote Switch board holder AND THE LED BOARD controller board and LED board (Holder of switch board) (1) Remove the panel and the corner box. (Refer to procedure 1) (2) Remove the front and side electrical box covers (each 2 screw).
- Page 34 OPERATION PROCEDURE PHOTOS/FIGURES 6. REMOVING THE INDOOR FAN MOTOR AND THE Photo 8 LINE FLOW FAN Lead wire of pipe thermistor (1) Remove the panel and the corner box. (Refer to procedure 1) (2) Remove the electrical box (Refer to procedure 2) and the Motor band nozzle assembly (Refer to procedure 4).
- Page 35 OPERATION PROCEDURE PHOTOS/FIGURES 8. REMOVING THE HEAT EXCHANGER Photo 12 (1) Remove the panel and the corner box (Refer to procedure 1). (2) Remove the electrical box (Refer to procedure 2) and the Heat exchanger nozzle assembly (Refer to procedure 4). (3) Remove the water cover.
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Page 36: Remote Controller
REMOTE CONTROLLER 13-1. REMOTE CONTROLLER FUNCTIONS <PAR-41MAA> 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 37 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>...
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Page 38: Menu Structure
Menu structure Main menu Press the button. Move the cursor to the desired item with the buttons, and press the button. Operation Vane · 3D i-See · Vent. (Lossnay) High power Comfort Manual vane angle 3D i-See sensor Vertical air direction Horizontal air direction Timer menu Timer... - Page 39 Continue from the previous page. Maintenance menu Error information Filter information Cleaning Auto descending panel Descending operation Descending adjustment Service menu Test run menu Test run Drain pump test run Maintenance information Collect model names and serial No. Model name input Serial No.
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Page 40: Main Menu List
Main menu list Main Setting and display items Setting details menu Operation Vane · 3D i-See · Vent. Vane: Use to set the vertical air direction. (Vane.Vent. (Lossnay)) Louver: Use to set the horizontal air direction. 3D i-See sensor: This setting is available only for the air conditioners that support easy setting function of motion sensing air direction. -
Page 41: Maintenance
Main Setting and display items Setting details menu Initial Basic Main/Sub When connecting 2 remote controllers, one of them needs to be designated as setting setting a sub controller. Clock Use to set the current time. Daylight Set the daylight saving time. saving time Administrator The administrator password is required to make the settings for the following... -
Page 42: Controller Interface
<PAR-SL97A-E> Controller interface Transmission area Transmission indicator Remote controller display Timer indicator *For explanation purposes, all of the items that appear in the display are shown. *All items are displayed when the Reset button is pressed. Operation areas ON/OFF button Temperature setting buttons Fan Speed button (Changes fan speed) Timer Off button... - Page 43 <PAR-SL101A-E> Controller interface Transmission area Remote controller display Set Temperature buttons OFF/ON button Mode button (Changes operation mode) Fan Speed button (Changes fan speed) Airflow button (Changes up/ i-see button* down airflow direction) Timer ON button Menu button Timer OFF button SET/SEND button Weekly timer ON/OFF button* CANCEL button...
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Page 44: Error Information
13-2. ERROR INFORMATION When an error occurs, the following screen will appear. Check the error status, stop the operation, and consult your dealer. 1. Check code, error unit, refrigerant address, date and time of occur- Error information rence, model name, and serial number will appear. Error code The model name and serial number will appear only if the informa- Error unit... - Page 45 • Checking the error information Maintenance menu While no errors are occurring, page 2/2 of the error information can be Error information viewed by selecting ˝Error information˝ from the Maintenance menu. Filter information Errors cannot be reset from this screen. Cleaning Main menu: Cursor...
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Page 46: Service Menu
13-3. SERVICE MENU Maintenance password is required 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Main Main menu *At the main display, the menu button and select ˝Service˝ to make Service the maintenance setting. 2. When the Service menu is selected, a window will appear asking for the pass- Service menu word. -
Page 47: Test Run Operation
13-4. TEST RUN 13-4-1. PAR-41MAA 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Test run Input maintenance info. Settings Check Select ˝Test run˝ with the F1 or F2 button, and press the [ ] button. Others 2. - Page 48 13-4-2. PAR-SL97A-E Measure an impedance between the power supply terminal block on the outdoor unit and ground with a 500 V Megger and check that it is equal to or greater than 1.0 MΩ. TEST RUN 1. Turn on the main power to the unit. TEST RUN 2.
- Page 49 13-5. FUNCTION SETTING 13-5-1. PAR-41MAA Settings menu 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Function setting Rotation setting Select ˝Setting˝ from the Service menu, and press the [ ] button. Service menu: Select ˝Function setting˝, and press the [ ] button.
- Page 50 Pattern 2 Function setting Ref. address 4. Toggle through the pages with the F3 or F4 button. Grp. (1/8) Mode 1 Mode 2 Mode 3 5. Select the mode number with the F1 or F2 button, and then press the [ Mode 4 button.
- Page 51 13-5-2. PAR-SL97A-E Functions can be selected with the wireless remote controller. Function selection using wireless remote controller is available only for refriger- ant system with wireless function. Refrigerant address cannot be specified by the wireless remote controller. [Flow of function selection procedure] The flow of the function selection procedure is shown below.
- Page 52 13-5-3. PAR-SL101A-E 1. Going to the function select mode Press the button between of 5 seconds. (Start this operation from the status of remote controller display turned off.) [CHECK] is lit and ˝00˝ blinks. (Fig. 1) Press the button to set the ˝50˝. Direct the wireless remote controller toward the receiver of the indoor unit and press the button.
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Page 53: Rotation Setting
13-6. ROTATION SETTING Setting method of each function by wired remote controller Settings menu Function setting ■ PAR-41MAA Rotation setting 1. Stop operation Service menu: Select "Service" from the Main menu, and press the [ ] button. Cursor Select "Settings" with the F1 or F2 button, and press the [ ] button. -
Page 54: Error History
13-7. ERROR HISTORY 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Test run Input maintenance info. Settings Check Others Select ˝Check˝ with the F1 or F2 button, and press the [ button. Select ˝Error history˝ with the F1 or F2 button, and press the [ ] button. - Page 55 5. Preliminary error history Preliminary error hist. Select "Preliminary error hist." from the Error history menu, and press Error Unt# dd/mm/yy the [ ] button. 32 preliminary error history records will appear. Error history menu: Delete Page 4 records are shown per page, and the top record on the first page indi- cates the latest error record.
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Page 56: Self-Diagnosis
13-8. SELF-DIAGNOSIS 13-8-1. PAR-41MAA 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Diagnosis Self check Select ˝Check˝ from the Service menu, Remote controller check and press the [ ] button. Service menu: Select ˝Diagnosis˝ from the Check menu, Cursor and press the [ ] button. - Page 57 13-8-2. PAR-SL97A-E 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> Refrigerant [Procedure] address display 1. Press the CHECK button twice. CHECK •...
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Page 58: Remote Controller Check
13-9. REMOTE CONTROLLER CHECK If operations cannot be completed with the remote controller, diagnose the remote controller with this function. 1. Select ˝Service˝ from the Main menu, Diagnosis and press the [ ] button. Self check Remote controller check Select ˝Check˝ from the Service menu, and press the [ ] button. - Page 59 13-10. SMOOTH MAINTENANCE 1. Select ˝Service˝ from the Main menu, and press the [ ] button. Check menu Error history Diagnosis Smooth maintenance Request code Select ˝Check˝ with the F1 or F2 button, and press the [ ] button. Service menu: Cursor Select ˝Smooth maintenance˝...
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Page 60: Request Code
■ Refrigerant address Single refrigerant system Multi refrigerant system (group control) In the case of single refrigerant system, the refrigerant address Up to 16 refrigerant systems (16 outdoor units) can be con- is ˝00˝ and no operation is required. nected as a group by 1 remote controller. To check or set the Simultaneous twin, triple units belong to this category refrigerant addresses. - Page 61 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN MITSUBISHI ELECTRIC CONSUMER PRODUCTS (THAILAND) CO., LTD. 700/406 MOO 7, TAMBON DON HUA ROH, AMPHUR MUANG, CHONBURI 20000 THAILAND Published: Sep. 2021. No. TCH068 Specifications are subject to change without notice.
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