Mitsubishi Electric MR. Slim SEZ-KD25VAQ Technical & Service Manual Download Page 33

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6-6. TROUBLE CRITERION OF MAIN PARTS

Room temperature
thermistor
(TH1)

Condenser/evaporator
temperature thermistor
(TH5)

Measure the resistance with a tester.
(Part temperature 10

C ~ 30

Pipe temperature
thermistor/liquid
(TH2)

Wiring diagram

Check method and criterion

Part name

Normal

Ω

~20k

Ω

Abnormal

Opened or short-circuited

Motor

Board with build-in motor

Current detecting resistor

Regulator

Hall IC

Motor winding

Power

device

Pre

driver

Vm (Power supply for motor)

Vcc (Power supply for control)

Vsp (Speed command voltage)

PG (Pulse output for rotation)

GND

HWE1008B.qx 12.10.10 14:07 Page 31

Summary of Contents for MR. Slim SEZ-KD25VAQ

Page 1: ...P AIR CONDITIONERS TECHNICAL SERVICE MANUAL Model name Indoor unit Model name Indoor unit SEZ KD25VAQ SEZ KD35VAQ SEZ KD50VAQ SEZ KD60VAQ SEZ KD71VAQ Series SEZ 2012 INDOOR UNIT WIRED REMOTE CONTROLLER option ON OFF TEMP ...

Page 2: ......

Page 3: ...1 PART NAMES AND FUNCTIONS 2 2 SPECIFICATIONS 4 3 OUTLINES AND DIMENSIONS 17 4 WIRING DIAGRAM 19 5 REFRIGERANT SYSTEM DIAGRAM 20 6 TROUBLESHOOTING 21 7 DISASSEMBLY PROCEDURE 33 CONTENTS ...

Page 4: ...R TEST TEMP MENU BACK DAY MONITOR SET CLOCK ON OFF Set Temperature buttons Down Up Timer Menu button Monitor Set button Mode button Return button Set Time buttons Back Ahead Timer On Off button Set Day button Opening the door Start Stop button Fan Speed button Filter button return sign button Test Run button Service button Clear button Airflow Up Down button Louver button Operation button To prece...

Page 5: ...onding timer is set Up Down Air Direction indica tor The indicator shows the direc tion of the outcoming airflow One Hour Only indicator Displayed if the airflow is set to Low and downward during COOL or DRY mode Operation varies according to model The indicator goes off after one hour at which time the airflow di rection also changes Room Temperature display Shows the room temperature Louver disp...

Page 6: ...sory Min size of wire Amperage of wire breaker 19 to 30 67 to 86 17 to 28 63 to 83 230V 50Hz 0 04 0 39 Sirocco fan x 2 5 15 35 50 DC blushless motor 0 096 Direct driven 5 5 7 0 9 0 Galvanized 200 x 700 x 700 7 7 8 x 27 9 16 x 27 9 16 18 1 6 1 8 15 ø6 35 ø1 4 Flare ø9 52 ø3 8 Flare O D 32 1 9 32 23 26 30 Polystyrene foam Polyethylene foam Urethane foam PP Honeycomb fabric washable Fuse 250V 6 3A Cr...

Page 7: ...e of wire Amperage of wire breaker 19 to 30 67 to 86 17 to 28 63 to 83 230V 50Hz 0 07 0 63 Sirocco fan x 3 5 15 35 50 DC blushless motor 0 096 Direct driven 10 0 12 5 15 0 Galvanized 200 x 900 x 700 7 7 8 x 35 7 16 x 27 9 16 23 1 6 1 8 15 ø6 35 ø1 4 Flare ø12 7 ø1 2 Flare O D 32 1 9 32 30 34 37 Polystyrene foam Polyethylene foam Urethane foam PP Honeycomb fabric washable Fuse 250V 6 3A Cross fin A...

Page 8: ...r 20 CD B 68 FD B Outdoor 7 CD B 6 CW B 45 FD B 43 FW B 1 Cooling Heating capacity indicates the maximum value at operation under the following condition Refrigerant piping diameter R410A Noise level Low Mid High measured in anechoic room Heat exchanger Terminal block Power outlet A Accessory Min size of wire Amperage of wire breaker 19 to 30 67 to 86 17 to 28 63 to 83 Cooling Heating 230V 50Hz 0 ...

Page 9: ...APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 µbar BAND CENTER FREQUENCIES Hz SEZ KD25VAQ External static pressure 50Pa High Middle 33 SPL dB 29 Low 25 LINE 50 60Hz NOTCH 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC ...

Page 10: ... 4000 8000 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 µbar BAND CENTER FREQUENCIES Hz SEZ KD35VAQ External static pressure 50Pa High Middle 35 SPL dB 31 Low 25 LINE 50 60Hz NOTCH 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 5...

Page 11: ... 4000 8000 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 µbar BAND CENTER FREQUENCIES Hz SEZ KD50VAQ External static pressure 50Pa High Middle 39 SPL dB 36 Low 32 LINE 50 60Hz NOTCH 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 5...

Page 12: ...0 4000 8000 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 µbar BAND CENTER FREQUENCIES Hz SEZ KD60VAQ External static pressure 50Pa High Middle 39 SPL dB 36 Low 32 LINE 50 60Hz NOTCH 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC ...

Page 13: ...RESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB 0 dB 0 0002 µbar BAND CENTER FREQUENCIES Hz SEZ KD71VAQ External static pressure 50Pa High Middle 42 SPL dB 37 Low 32 LINE 50 60Hz NOTCH 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC 60 NC 50 NC 40 NC 30 NC 20 NC 70...

Page 14: ...nal static pressure Pa SEZ KD25VAQ External static pressure 5Pa 220 240V 50 60Hz Middle Low High Rated point Limit 0 10 20 30 40 50 60 70 80 4 5 6 7 8 9 10 Airflow rate m3 min External static pressure Pa SEZ KD25VAQ External static pressure 50Pa 220 240V 50 60Hz Middle Low High Limit Rated point 0 10 20 30 40 50 60 70 80 4 5 6 7 8 9 10 Airflow rate m3 min External static pressure Pa SEZ KD25VAQ Ex...

Page 15: ...SEZ KD35VAQ External static pressure 5Pa 220 240V 50 60Hz Middle Low High Limit Rated point 0 20 10 30 40 50 60 70 80 External static pressure Pa Airflow rate m3 min SEZ KD35VAQ External static pressure 50Pa 220 240V 50 60Hz 6 7 8 9 10 11 12 Middle Low High Limit Rated point 0 20 10 30 40 50 60 70 80 External static pressure Pa SEZ KD35VAQ External static pressure 35Pa 220 240V 50 60Hz 6 7 8 9 10 ...

Page 16: ...irflow rate m3 min 0 40 30 20 10 8 9 10 11 12 13 14 15 16 Middle Low High Limit Rated point External static pressure Pa SEZ KD50VAQ External static pressure 50Pa 220 240V 50 60Hz Airflow rate m3 min 8 9 10 11 12 13 14 15 16 0 10 20 30 40 50 60 70 80 Middle Low High Limit Rated point External static pressure Pa SEZ KD50VAQ External static pressure 35Pa 220 240V 50 60Hz Airflow rate m3 min 8 9 10 11...

Page 17: ...rate m3 min 9 10 11 12 13 14 15 16 17 18 19 0 40 30 20 10 Middle Low High Limit Rated point External static pressure Pa SEZ KD60VAQ External static pressure 50Pa 220 240V 50 60Hz Airflow rate m3 min 9 10 11 12 13 14 15 16 17 18 19 0 10 20 30 40 60 70 50 80 Middle Limit Rated point Low High External static pressure Pa SEZ KD60VAQ External static pressure 35Pa 220 240V 50 60Hz Airflow rate m3 min 9 ...

Page 18: ...ate m3 min 0 40 30 20 10 11 12 13 14 15 16 17 18 19 20 21 Middle Low High Limit Rated point External static pressure Pa SEZ KD71VAQ External static pressure 50Pa 220 240V 50 60Hz Airflow rate m3 min 21 20 19 18 17 16 15 14 13 12 11 0 10 20 30 40 50 80 70 60 Middle Low High Limit Rated point External static pressure Pa SEZ KD71VAQ External static pressure 35Pa 220 240V 50 60Hz Airflow rate m3 min 0...

Page 19: ...sion bolt hole 4 14X30 Slot Air filter Control box 2XE 2 9 2X2 2 9 L 2 9 Knockout hole 27 Indoor outdoor connecting line Knockout hole 27 Remote controller transmission line 10 170 57 15 20 100 100X E 1 F 30 D Duct 625 Suspension bolt pitch 90 A 23 B Suspension bolt pitch C 23 677 700 25 100 23 150 Duct 116 70 270 102 25 49 10 88 100 100XJ K 88 12 12 37 100 20 157 5 20 H 200 37 Note1 Use M10 screw...

Page 20: ... from the direction of the arrow B Access door 4 Fig 1 Fig 3 Fig 2 Fig 4 Fig 5 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 1 When a space ...

Page 21: ...ITCH CONNECTOR LOSSNAY R B I B CN32 REMOTE CONTROLLER BOARD INDOOR CONTROLLER BOARD SW2 SW1 TB4 TERMINAL BLOCK INDOOR OUTDOOR CONNECTING LINE SYMBOL EXPLANATION CN2L CONNECTOR HA TERMINAL A CN51 LED1 CN41 CONNECTOR CENTRALLY CONTROL POWER SUPPLY I B DSA FUSE AC250V 6 3A FUSE TB6 X1 AUX RELAY VARISTOR ZNR01 02 MS 3 1 3 5 3 1 1 4 5 6 7 3 4 1 2 4 2 3 1 1 3 2 4 1 2 3 TB6 R B 1 2 X1 DC310 340V RECTIFY ...

Page 22: ...TH2 Distributor Condenser evaporator temperature thermistor TH5 Room temperature thermistor TH1 Refrigerant flow in cooling Refrigerant flow in heating Strainer 50 Strainer 50 Heat exchanger Refrigerant GAS pipe connection Flare Refrigerant LIQUID pipe connection Flare ...

Page 23: ...7 Indoor outdoor unit communication error P4 Drain sensor error P5 Drain pump error P6 Freezing Overheating protection operation EE Communication error between indoor and outdoor units P8 Pipe temperature error E0 E3 E5 Remote controller transmission error E1 E2 Remote controller control board error Fb Indoor unit control system error memory error etc E9 Indoor outdoor unit communication error Tra...

Page 24: ...ection Correct operation For description of each LED LED1 2 3 provided on the indoor controller refer to the following table LED1 power for microcomputer Indicates whether control power is supplied Make sure that this LED is always lit LED2 power for remote controller Indicates whether power is supplied to the remote controller This LED lights only in the case of the indoor unit which is connected...

Page 25: ...essor overcurrent interruption When compressor locked Abnormal high discharging temperature 49C worked insufficient refrigerant Abnormal high pressure 63H worked Overheating safeguard operation Abnormal temperature of heat sink Outdoor unit fan protection stop Compressor overcurrent interruption Abnormal of power module Abnormality of super heat due to low discharge temperature Abnormality such as...

Page 26: ...roller LED 3 communication between indoor and outdoor units AUTO RESTART FUNCTION Indoor controller board This model is equipped with the AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller the operation mode set temperature and the fan speed are memorized by the indoor controller board The auto restart function sets to work the moment the power has restored after p...

Page 27: ...ics refer to P1 above 2 Check contact failure of connector CN44 on the indoor controller board Refer to 6 5 Turn the power on again and check restart after inserting connector again 4 Check pipe liquid temperature with remote controller in test run mode If pipe liquid temperature is extremely low in cooling mode or high in heating mode refrigerant circuit may have defective 5 Check pipe liquid tem...

Page 28: ...tor is defective Indoor controller board is defective 5 Defective outdoor fan control 6 Overcharge of refrigerant 7 Defective refrigerant circuit clogs 8 Bypass circuit of outdoor unit is defective Cooling or drying mode 1 Check clogging of the filter 2 Remove shields 4 Refer to 6 7 DC Fan motor FAN MOTOR INDOOR CONTROLLER BOARD 5 Check outdoor fan motor 67 Check operating condition of refrigerant...

Page 29: ...s not the above mentioned problem of 1 3 4 Diagnose remote controllers a When RC OK is displayed Remote controllers have no problem Turn the power off and on again to check If abnormality generates again replace indoor controller board b When RC NG is displayed Replace remote controller c When RC E3 is displayed d When ERC 00 06 is displayed c d Noise may be causing abnormality If the unit is not ...

Page 30: ...ircuit board to transmit signals Error Code Abnormal point and detection method Cause Countermeasure Fb Indoor controller board Abnormal if data cannot be read normally from the nonvolatile memory of the indoor controller board 1 Defective indoor controller board 1 Replace indoor controller board E1 or E2 Remote controller control board 1 Abnormal if data cannot be read normal ly from the nonvolat...

Page 31: ...oard is defective 2 LED2 on indoor controller board is blinking When LED1 on indoor controller board is also blinking Connection failure of indoor outdoor unit connecting wire When LED1 is lit 1 Mis wiring of remote controller wires Under twin triple indoor unit system 2 or more indoor units are wired together 2 Refrigerant address for outdoor unit is wrong or not set Under grouping control system...

Page 32: ...or transmission 0 24VDC CNMF Fan motor output 1 4 310 340 VDC 5 4 15 VDC 6 4 0 6 5 VDC 7 4 Stop 0 or 15 VDC Run 7 5 VDC 0 15 pulse CNP Drain up mechanism output 200VAC CN2L LOSSNAY CN90 Wireless remote controller 1 VFG Voltage on the side of PC672 and C955 Same with the voltage between 7 and 4 of CNMF VCC Voltage between the C955 pins 15 VDC Same with the voltage between 5 and 4 of CNMF Vsp Voltag...

Page 33: ...C 30 C Pipe temperature thermistor liquid TH2 Wiring diagram Check method and criterion Part name Normal 8kΩ 20kΩ Abnormal Opened or short circuited Motor Board with build in motor Current detecting resistor Regulator Hall IC Motor winding Power device Pre driver Vm Power supply for motor Vcc Power supply for control Vsp Speed command voltage PG Pulse output for rotation GND ...

Page 34: ...tor CNMF Measure the voltage in the indoor controller circuit board TEST POINT 1 VDC between 1 and 4 of the fan connector VDC DC310 340V TEST POINT 2 VCC between 5 and 4 of the fan connector VCC DC15V Wiring recovery Replace drain pump DP Replace indoor controller board Replace the fan motor Replace indoor controller board I B Replace fan motor MF Replace indoor controller board Replace the fan mo...

Page 35: ...ve it 2 Thermistor Intake air 1 Remove the control box cover according to the procedure in section 1 1 Pull out the thermistor holder B and thermis tor C on the control box A Fig 1 Fig 2 SEZ KD VA model only KD71VA L model only B C Fig 3 DISASSEMBLY PROCEDURE 7 Exercise caution when removing heavy parts ...

Page 36: ...on of the arrow 1 2 Remove the fixing screws on the bottom plate D E to remove it 2 Removing the drainpan 1 Pull out the drain pan in the direction of the arrow 1 Note Drain the water out of the drain pan before removing it To avoid dew condensation use insulated screws in the places marked with circles in Fig 6 D E a a a a a Tab Fig 4 Fig 5 Insulation material E Fig 6 ...

Page 37: ...ng the Heat exchanger cover 1 Remove the four fixing screws on the heat exchanger cover F to remove it 3 Removing the thermistor 1 Remove the thermistor G from the thermistor holder H on the copper tube Thermistor size Liquid pipe ø8mm Condenser evaporator ø6mm F Fig 7 G H Fig 8 Exercise caution when removing heavy parts ...

Page 38: ... screws to take the top half of the fan casing off Fig 12 Exercise caution when removing heavy parts 2 Removing the fan casing bottom half 1 Squeeze the tabs on the fan casing to remove it in the direction of arrow 2 a a Tab Fig 10 5 Fan and fan motor 1 Removing the filter and the bottom plate 1 Push down the tab on the filter and pull out the filter in the direction of the arrow 1 2 Remove the fi...

Page 39: ...emove it 7 Heat exchanger 1 Remove the drain pan according to the proce dure in section 3 2 Remove the heat exchanger cover according to the procedure in section 4 2 3 Removing the cover 1 Remove the two fixing screws on the cover L to remove it 4 Removing the Heat exchanger 1 Remove the fixing screws on the heat exchanger M to remove it L Fig 15 M Fig 16 Exercise caution when removing heavy parts...

Page 40: ...http Global MitsubishiElectric com HWE1008B New publication effective Sep 2012 Specifications subject to change without notice ...

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