Mitsubishi Electric SEZ-KD25VL Service Manual Download | Manualshive

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6-6. TROUBLE CRITERION OF MAIN PARTS
SEZ-KD25VA(L)
SEZ-KD35VA(L)
SEZ-KD50VA(L)
SEZ-KD60VA(L)
SEZ-KD71VA(L)

Room temperature
thermistor
(TH1)

Condenser/evaporator
temperature thermistor
(TH5)

Measure the resistance with a tester.
(Part temperature 10

°

C ~ 30

°

C)

Pipe temperature
thermistor/liquid
(TH2)

Wiring diagram

Check method and criterion

Part name

Normal

8k

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

HWE0711C.qx 12.10.10 14:10 Page 32

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Summary of Contents for SEZ-KD25VL

Page 1: ... TECHNICAL SERVICE MANUAL Model name Indoor unit Model name Indoor unit SEZ KD25VA L SEZ KD35VA L SEZ KD50VA L SEZ KD60VA L SEZ KD71VA L Series SEZ 2012 INDOOR UNIT WIRED REMOTE CONTROLLER ON OFF TEMP WIRELESS REMOTE CONTROLLER ON OFF TEMP ...

Page 2: ......

Page 3: ...1 PART NAMES AND FUNCTIONS 2 2 SPECIFICATIONS 5 3 OUTLINES AND DIMENSIONS 18 4 WIRING DIAGRAM 20 5 REFRIGERANT SYSTEM DIAGRAM 21 6 TROUBLESHOOTING 22 7 DISASSEMBLY PROCEDURE 34 CONTENTS ...

Page 4: ...F FILTER CHECK OPERATION CLEAR 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 but...

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: ...ler install the holder included with the remote controller on a wall and be sure to always place the remote controller in the holder after use CLOCK CHECK RESET SET TESTRUN MODE FAN VANE LOUVER min h AUTOSTART AUTOSTOP ON OFF TEMP NOT AVAILABLE MODELSELECT TESTRUN CHECK SET TEMPERATURE button SET TEMPERATURE button sets and any desired room temperature AUTO STOP AUTO START button Used for selectin...

Page 7: ...inal block Power outlet A Accessory 3 Min size of wire Amperage of wire breaker 19 to 30 67 to 86 17 to 28 63 to 83 220 240V 50 60Hz 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 Hon...

Page 8: ...ower outlet A Accessory 3 Min size of wire Amperage of wire breaker 19 to 30 67 to 86 17 to 28 63 to 83 220 240V 50 60Hz 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 fa...

Page 9: ... B 43 FW B 1 Cooling Heating capacity indicates the maximum value at operation under the following condition 3 Wired Remote Controller for VA model Wireless Remote Controller for VAL model Refrigerant piping diameter R410A Noise level Low Mid High measured in anechoic room Heat exchanger Terminal block Power outlet A Accessory 3 Min size of wire Amperage of wire breaker 19 to 30 67 to 86 17 to 28 ...

Page 10: ...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 KD25VA L 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 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 KD35VA L 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 ...

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 KD50VA L 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: ...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 KD60VA L 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 14: ...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 KD71VA L 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 7...

Page 15: ...al static pressure Pa SEZ KD25VA L 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 KD25VA L 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 KD25VA L ...

Page 16: ...EZ KD35VA L 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 KD35VA L 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 KD35VA L External static pressure 35Pa 220 240V 50 60Hz 6 7 8 9 1...

Page 17: ...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 KD50VA L 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 KD50VA L External static pressure 35Pa 220 240V 50 60Hz Airflow rate m3 min 8 9 10 ...

Page 18: ...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 KD60VA L 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 KD60VA L External static pressure 35Pa 220 240V 50 60Hz Airflow rate m3 min ...

Page 19: ...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 KD71VA L 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 KD71VA L External static pressure 35Pa 220 240V 50 60Hz Airflow rate m3 min...

Page 20: ...or outdoor connecting line Suspension 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 ...

Page 21: ... 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 of 300 mm or more is available below the unit between the unit and the ceiling Fig 1 Create access door 1 and 2 450 x ...

Page 22: ...MISSION INDOOR OUTDOOR POWER SUPPLY I B LED1 POWER SUPPLY I B CN90 CONNECTOR WIRELESS ZNR01 02 VARISTOR AUX RELAY X1 FUSE FUSE AC250V 6 3A DSA CONNECTOR CENTRALLY CONTROL CN41 CN51 CONNECTOR HA TERMINAL A CN2L NAME SYMBOL EXPLANATION SW1 SW2 INDOOR CONTROLLER BOARD CN32 I B SYMBOL SYMBOL NAME CONNECTOR LOSSNAY CONNECTOR REMOTE SWITCH SWE ARRESTER SWITCH FOR MODEL SELECTION SWITCH FOR CAPACITY CODE...

Page 23: ...tor 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 SEZ KD25VA L SEZ KD35VA L SEZ KD50VA L SEZ KD60VA L SEZ KD71VA L ...

Page 24: ...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 25: ...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 26: ...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 27: ...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 28: ...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 29: ...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 30: ...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 31: ...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 32: ...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 33: ...et temperature CN3C Indoor outdoor 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 be...

Page 34: ...ith a tester Part temperature 10 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 ro...

Page 35: ...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 36: ...ing screws on the cover A to remove 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 37: ...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 38: ...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 39: ... 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 40: ...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...

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Page 44: ...http Global MitsubishiElectric com HWE0711C New publication effective Sep 2012 Specifications subject to change without notice ...

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