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Mitsubishi Electric SEZ Series Technical & Service Manual
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Mitsubishi Electric SEZ Series Technical & Service Manual

Split-type, heat pump air conditioners
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  • Page 2: Table Of Contents

    CONTENTS I SAFETY PRECAUTION [1] Safety Precaution ........................1 1.ALWAYS OBSERVE FOR SAFETY..................1 2.CAUTIONS RELATED TO NEW REFRIGERANT ..............1 II PART NAMES AND FUNCTIONS [1] Part Names and Functions ....................... 7 III SPECIFICATIONS [1] Specifications.......................... 15 IV OUTLINES AND DIMENSIONS [1] Outlines and Dimensions......................
  • Page 3 HWE21010...

  • Page 4: I Safety Precaution

    [ I SAFETY PRECAUTION ] I SAFETY PRECAUTION [1] 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 In case that refrigerant type is R32, this unit uses a flammable refrigerant. (Risk of fire) If refrigerant leaks and comes in contact with fire or heating part, it will create harmful gas and there is risk of fire.
  • Page 5 [ I SAFETY PRECAUTION ] [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 6 [ I SAFETY PRECAUTION ] [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 7 [ I SAFETY PRECAUTION ] (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 atmo- sphere.
  • Page 8 [ I SAFETY PRECAUTION ] 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; ·...
  • Page 9 [ I SAFETY PRECAUTION ] 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 ·...

  • Page 10: Part Names And Functions

    [ II PART NAMES AND FUNCTIONS ] II PART NAMES AND FUNCTIONS [1] Part Names and Functions Indoor Unit SEZ-M25DA(L)2 SEZ-M35DA(L)2 SEZ-M50DA(L)2 SEZ-M60DA(L)2 SEZ-M71DA(L)2 Air outlet Air outlet duct flange Air inlet - 7 - HWE21010...
  • Page 11 [ II PART NAMES AND FUNCTIONS ] • Wired remote controller (Option) PAR-41MAA The functions which can be used are restricted according to each model. Display The factory 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 12 [ II PART NAMES AND FUNCTIONS ] 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 ⑤...
  • Page 13 [ II PART NAMES AND FUNCTIONS ] Menu structure Main menu Operation Vane•3D i-See•Vent.(Lossnay) High power Comfort Manual vane angle Vertical air direction Horizontal air direction 3D i-See sensor Timer menu Timer On/Off timer Auto-Off timer Weekly timer OU silent mode Night setback Energy saving Restriction...
  • Page 14 [ II PART NAMES AND FUNCTIONS ] 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. (Mr. SLIM only) Model name input Serial No.
  • Page 15 [ II PART NAMES AND FUNCTIONS ] Main menu Setting items Setting details Operation Vane•3D i-See•Vent. Vane: Use to set the vertical air direction. Louver: Use to set the horizontal air direction. (Lossnay) 3D i-See sensor: This setting is available only for the air (Vane•Vent.(Lossnay)) conditioners that support easy setting function of motion sensing air direction.
  • Page 16 [ II PART NAMES AND FUNCTIONS ] Main menu Setting items Setting details Energy Energy Schedule Set the start/stop times to operate the units in the energy-save saving saving mode for each day of the week, and set the energy-saving rate. •...
  • Page 17 [ II PART NAMES AND FUNCTIONS ] Wireless remote controller 7UDQVPLVVLRQ DUHD 1RW DYDLODEOH 5HPRWH FRQWUROOHU GLVSOD\ %DWWHU\ UHSODFHPHQW LQGLFDWRU 6HW 7HPSHUDWXUH EXWWRQV 0RGH EXWWRQ &KDQJHV RSHUDWLRQ PRGH )DQ 6SHHG EXWWRQ &KDQJHV IDQ VSHHG LVHH EXWWRQ 7LPHU 21 EXWWRQ 0HQX EXWWRQ 7LPHU 2)) EXWWRQ &$1&(/ EXWWRQ QRW DYDLODEOH ...

  • Page 18: Specifications

    [ III SPECIFICATIONS ] III SPECIFICATIONS [1] Specifications Service Ref. SEZ-M25DA(L)2 Mode Cooling Heating Power supply Single phase, 50Hz, 220-240V Input 0.043 0.043 Running Current 0.44 0.44 External finish Galvanized sheets Heat exchanger Plate fin coil Fan (drive) × No. Sirocco fan ×...
  • Page 19 [ III SPECIFICATIONS ] Service Ref. SEZ-M50DA(L)2 Mode Cooling Heating Power supply Single phase, 50Hz, 220-240V Input 0.077 0.077 Running Current 0.64 0.64 External finish Galvanized sheets Heat exchanger Plate fin coil Fan (drive) × No. Sirocco fan × 3 Fan motor output 0.096 Airflow (Low-Mid-High)
  • Page 20 [ III SPECIFICATIONS ] Service Ref. SEZ-M71DA(L)2 Mode Cooling Heating Power supply Single phase, 50Hz, 220-240V Input 0.102 0.102 Running Current 0.80 0.80 External finish Galvanized sheets Heat exchanger Plate fin coil Fan (drive) × No. Sirocco fan × 4 Fan motor output 0.096 Airflow (Low-Mid-High)
  • Page 21 [ III SPECIFICATIONS ] NOISE CRITERION CURVES SEZ-M25DA(L)2 SEZ-M25DA(L)2 External static pressure: 5Pa External static pressure: 25Pa Power source: 220-240V Power source: 220-240V 70.0 70.0 65.0 65.0 60.0 60.0 55.0 NC-60 55.0 NC-60 50.0 50.0 45.0 45.0 NC-50 NC-50 40.0 40.0 35.0 35.0...
  • Page 22 [ III SPECIFICATIONS ] SEZ-M35DA(L)2 SEZ-M35DA(L)2 External static pressure: 5Pa External static pressure: 25Pa Power source: 220-240V Power source: 220-240V 70.0 70.0 65.0 65.0 60.0 60.0 55.0 NC-60 55.0 NC-60 50.0 50.0 45.0 45.0 NC-50 NC-50 40.0 40.0 35.0 35.0 NC-40 NC-40 30.0...
  • Page 23 [ III SPECIFICATIONS ] SEZ-M50DA(L)2 SEZ-M50DA(L)2 External static pressure: 5Pa External static pressure: 25Pa Power source: 220-240V Power source: 220-240V 70.0 70.0 65.0 65.0 60.0 60.0 55.0 NC-60 55.0 NC-60 50.0 50.0 45.0 45.0 NC-50 NC-50 40.0 40.0 35.0 35.0 NC-40 NC-40 30.0...
  • Page 24 [ III SPECIFICATIONS ] SEZ-M60DA(L)2 SEZ-M60DA(L)2 External static pressure: 5Pa External static pressure: 25Pa Power source: 220-240V Power source: 220-240V 70.0 70.0 65.0 65.0 60.0 60.0 55.0 NC-60 55.0 NC-60 50.0 50.0 45.0 45.0 NC-50 NC-50 40.0 40.0 35.0 35.0 NC-40 NC-40 30.0...
  • Page 25 [ III SPECIFICATIONS ] SEZ-M71DA(L)2 SEZ-M71DA(L)2 External static pressure: 5Pa External static pressure: 25Pa Power source: 220-240V Power source: 220-240V 70.0 70.0 65.0 65.0 60.0 60.0 55.0 NC-60 55.0 NC-60 50.0 50.0 45.0 45.0 NC-50 NC-50 40.0 40.0 35.0 35.0 NC-40 NC-40 30.0...
  • Page 26 [ III SPECIFICATIONS ] INDOOR FAN PERFORMANCE AND CORRECTED AIR FLOW SEZ-M25DA(L)2 SEZ-M25DA(L)2 External static pressure: 25Pa External static pressure: 5Pa Powersource: 220-240V Powersource: 220-240V Limit Limit High High Plasma Quad Middle Connect Middle Rated point Plasma Quad Connect Rated point Airflow rate (m /min) Airflow rate (m...
  • Page 27 [ III SPECIFICATIONS ] SEZ-M35DA(L)2 SEZ-M35DA(L)2 External static pressure: 5Pa External static pressure: 25Pa Powersource: 220-240V Powersource: 220-240V Limit High Limit Rated point Middle High Plasma Quad Middle Connect Plasma Quad Connect Rated point Airflow rate (m /min) Airflow rate (m /min) SEZ-M35DA(L)2 SEZ-M35DA(L)2...
  • Page 28 [ III SPECIFICATIONS ] SEZ-M50DA(L)2 SEZ-M50DA(L)2 External static pressure: 5Pa External static pressure: 25Pa Powersource: 220-240V Powersource: 220-240V Limit Limit High High Middle Rated point Middle Plasma Quad Connect Plasma Quad Connect Rated point Airflow rate (m /min) Airflow rate (m /min) SEZ-M50DA(L)2 SEZ-M50DA(L)2...
  • Page 29 [ III SPECIFICATIONS ] SEZ-M60DA(L)2 SEZ-M60DA(L)2 External static pressure: 5Pa External static pressure: 25Pa Power source: 220-240V Power source: 220-240V Limit Limit High High Plasma Quad Middle Connect Middle Rated point Plasma Quad Connect Rated point Airflow rate (m /min) Airflow rate (m /min) SEZ-M60DA(L)2...
  • Page 30 [ III SPECIFICATIONS ] SEZ-M71DA(L)2 SEZ-M71DA(L)2 External static pressure: 5Pa External static pressure: 25Pa Power source : 220-240V Power source: 220-240V Limit High Rated point Limit Middle High Plasma Quad Connect Middle Rated point Airflow rate (m /min) Airflow rate (m /min) External static pressure must be over 25Pa when Plasma Quad Connect is equipped with SEZ-M71DA(L)2.

  • Page 31: Outlines And Dimensions

    [ IV OUTLINES AND DIMENSIONS ] IV OUTLINES AND DIMENSIONS [1] Outlines and Dimensions SEZ-M25DA(L)2 Unit : mm SEZ-M35DA(L)2 SEZ-M50DA(L)2 SEZ-M60DA(L)2 SEZ-M71DA(L)2 157.5 37 100 outlet inlet L-Ø2.9 2XE-Ø2.9 Air filter 625 (Suspension bolt pitch) Knockout hole Ø27 Suspension bolt hole (Remote controller transmission line) 4-14X30 Slot 2 Refrigerant piping flare connection (liquid)
  • Page 32 [ IV OUTLINES AND DIMENSIONS ] SEZ-M25DA(L)2 SEZ-M35DA(L)2 SEZ-M50DA(L)2 SEZ-M60DA(L)2 SEZ-M71DA(L)2 Secure enough access space to allow for the maintenance, inspection, and replacement of the motor, fan, drain pump, heat exchanger, and electric box in one of the following ways. Select an installation site for the indoor unit so that its maintenance access space will not be obstructed by beams or other objects.

  • Page 33: Wiring Diagram

    [ V WIRING DIAGRAM ] V WIRING DIAGRAM [1] Wiring Diagram SEZ-M25DA(L)2 SEZ-M35DA(L)2 SEZ-M50DA(L)2 SEZ-M60DA(L)2 SEZ-M71DA(L)2 "Set the SW5-8 to OFF when a remote controller other than INSIDE SECTION OF CONTROL BOX PAR-4·MAA/CT01MAA is connected." R.B. TRANSMISSION TB15 WIRES DC12V Optional Parts I.B.

  • Page 34: Refrigerant System Diagram

    [ VI REFRIGERANT SYSTEM DIAGRAM ] VI REFRIGERANT SYSTEM DIAGRAM [1] Refrigerant System Diagram SEZ-M25DA(L)2 SEZ-M35DA(L)2 SEZ-M50DA(L)2 SEZ-M60DA(L)2 SEZ-M71DA(L)2 Strainer Heat exchanger Refrigerant GAS pipe connection (Flare) Condenser/evaporator temperature thermistor (TH5) Refrigerant flow in cooling Refrigerant flow in heating Refrigerant LIQUID pipe connection (Flare) Pipe temperature thermistor/liquid...

  • Page 35: Troubleshooting

    [ VII TROUBLESHOOTING ] VII TROUBLESHOOTING [1] Troubleshooting 1. CAUTIONS ON TROUBLESHOOTING (1) Before troubleshooting, check the followings: Check the power supply voltage. Check the indoor/outdoor connecting wire for mis-wiring. (2) Take care the followings during servicing. Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn off the breaker.

  • Page 36: Malfunction-Diagnosis Method By Remote Controller

    [ VII TROUBLESHOOTING ] 3. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER ,Q FDVH RI WURXEOH GXULQJ RSHUDWLRQ! :KHQ D PDOIXQFWLRQ RFFXUV WR DLU FRQGLWLRQHU ERWK LQGRRU XQLW DQG RXWGRRU XQLW ZLOO VWRS DQG RSHUDWLRQ ODPS EOLQNV WR LQIRUP XQXVXDO VWRS 6HOIFKHFN! EXWWRQ 1 WR VWRS WKH DLU FRQGLWLRQHU  3UHVV WKH EXWWRQ 3 WR GLVDEOH LW...
  • Page 37 [ VII TROUBLESHOOTING ] [Output pattern A] Errors detected by indoor unit Wired remote Wireless remote controller controller Symptom Remark Beeper sounds/OPERATION INDICATOR lamp flashes Check code (Number of times) Intake sensor error Pipe (Liquid or 2-phase pipe) sensor error P2, P9 Indoor/outdoor unit communication error E6, E7...
  • Page 38 [ VII TROUBLESHOOTING ] For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table. LED 1 (power for microcomputer) Indicates whether control power is supplied. Make sure that this LED is always lit. LED 2 (power for remote controller) Indicates whether power is supplied to the remote controller.

  • Page 39: Self-Diagnosis Action Table

    [ VII TROUBLESHOOTING ] 4. SELF-DIAGNOSIS ACTION TABLE Note: Refer to the manual of outdoor unit for the details of display such as F, U, and other E. Abnormal point and detection method Countermeasure Error Code Cause Room temperature – Defective thermistor Check resistance value of thermistor.
  • Page 40 [ VII TROUBLESHOOTING ] Abnormal point and detection method Countermeasure Error Code Cause Freezing/overheating protection is (Cooling or drying mode) (Cooling or drying mode) working Clogged filter (reduced airflow) Check clogging of the filter. Freezing protection (Cooling mode) Short cycle of air path Remove shields.
  • Page 41 [ VII TROUBLESHOOTING ] Abnormal point and detection method Countermeasure Error Code Cause Abnormality of pipe temperature ther- Defective thermistor Check resistance value of thermistor. – mistor / Condenser-Evaporator (TH5) characteristics For characteristics, refer to (P1) above. Check contact failure of connector (CN44) The unit is in three-minute resume pro- Contact failure of connector on the indoor controller board.
  • Page 42 [ VII TROUBLESHOOTING ] Abnormal point and detection method Countermeasure Error Code Cause Indoor/outdoor unit communication Check LED display on the outdoor control cir- Contact failure, short circuit or, error (Signal receiving error) cuit board. (Connect A-control service tool, mis-wiring (converse wiring) of Abnormal if indoor controller board PAC-SK52ST.) indoor/outdoor unit connecting...

  • Page 43: Troubleshooting By Inferior Phenomena

    [ VII TROUBLESHOOTING ] 5. TROUBLESHOOTING BY INFERIOR PHENOMENA 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.

  • Page 44: Test Point Diagram

    [ VII TROUBLESHOOTING ] 6. TEST POINT DIAGRAM 6-1. Indoor controller board SEZ-M25DA(L)2 SEZ-M35DA(L)2 SEZ-M50DA(L)2 SEZ-M60DA(L)2 SEZ-M71DA(L)2 CN01 Power supply voltage (220 - 240 VAC) Emergency operation CN2L J41, J42 Pair No. setting for wireless remote LED3 controller Capacity setting CN90 CN22 For MA remote controller cable connection...

  • Page 45: Trouble Criterion Of Main Parts

    [ VII TROUBLESHOOTING ] 7. TROUBLE CRITERION OF MAIN PARTS SEZ-M25DA(L)2 SEZ-M35DA(L)2 SEZ-M50DA(L)2 SEZ-M60DA(L)2 SEZ-M71DA(L)2 Part name Check method and criterion Room temperature Measure the resistance with a tester. thermistor (Part temperature 10°C ~ 30°C) (TH1) Normal Abnormal Pipe temperature 8kΩ~20kΩ...

  • Page 46: Dc Fan Moter (Fan Motor/Indoor Controller Board)

    [ VII TROUBLESHOOTING ] 8. DC FAN MOTER (FAN MOTOR/INDOOR CONTROLLER BOARD) Check method of DC fan motor (fan motor / indoor controller circuit board) Notes · High voltage is applied to the connecter (CNMF) for the fan motor. Give attention to the service. ·...

  • Page 47: Disassembly Procedure

    [ VIII DISASSEMBLY PROCEDURE ] VIII DISASSEMBLY PROCEDURE [1] Disassembly Procedure SEZ-M25DA(L)2 SEZ-M35DA(L)2 SEZ-M50DA(L)2 SEZ-M60DA(L)2 SEZ-M71DA(L)2 1. Control box 1. Removing the control box cover Exercise caution when removing heavy parts. (1) Remove the two fixing screws on the cover (A) to remove it.

  • Page 48: Drainpan

    [ VIII DISASSEMBLY PROCEDURE ] 3. Drainpan 1. Removing the filter and the bottom plate Exercise caution when removing heavy parts. (1) Push up the tab on the filter, and pull out the filter in the direction of the arrow (2) Remove the fixing screws on the bottom plate (D), (E) to remove it.

  • Page 49: Thermistor (Condenser / Evaporator) (Liquid Pipe)

    [ VIII DISASSEMBLY PROCEDURE ] 4. Thermistor (Condenser / evaporator) (Liquid pipe) 1. Remove the drain pan according to the proce- Exercise caution when removing heavy parts. dure in section 3. 2. Removing the Heat exchanger cover (1) Remove the four fixing screws on the heat exchanger cover (F) to remove it.

  • Page 50: Fan And Fan Motor

    [ VIII DISASSEMBLY PROCEDURE ] 5. Fan and fan motor 1. Removing the filter and the bottom plate Exercise caution when removing heavy parts. (1) Push down the tab on the filter, and pull out the filter in the direction of the arrow (2) Remove the fixing screws on the bottom plate (J) to remove it.

  • Page 51: Bearing [M50·60·71Da(L) Model Only]

    [ VIII DISASSEMBLY PROCEDURE ] 6. Bearing [M50·60·71DA(L) model only] 1. Removing the bearing Exercise caution when removing heavy parts. (1) Remove the two fixing screws on the bearing cover (K) to remove it. Fig. 13 (2) Remove the two bearing retainer screws to remove the bearing.

This manual is also suitable for:

Sez-m25da(l)2Sez-m35da(l)2Sez-m50da(l)2Sez-m60da(l)2Sez-m71da(l)2

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