Mitsubishi Electric SEZ Series Technical & Service Manual Download Page 44

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[

VII

TROUBLESHOOTING ]

- 41 -

HWE21010

6. TEST POINT DIAGRAM

SEZ-M25DA(L)2
SEZ-M35DA(L)2
SEZ-M50DA(L)2
SEZ-M60DA(L)2
SEZ-M71DA(L)2

6-1. Indoor controller board

CN01 Power supply voltage (220 - 240 VAC)

SWE Emergency

operation

J41, J42 Pair No. setting for wireless remote
controller

SW2 Capacity

setting

CN22 For MA remote controller cable
connection

(10.4 - 14.6 VDC (Between 1 and 3.))

CN51 Centralized

control

CN41 JEMA standard HA terminal A

CN4F

Float switch

CN44 Thermistor
(liquid/condenser/evaporator
temperature)

CN20 Thermistor (Inlet temperature)

CN3C Indoor-outdoor transmission

(0 - 24 VDC)

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

(200

VAC)

CN2L LOSSNAY

CN90 Wireless remote controller

(*1)

Vsp

Voltage between the C626 pins

0 VDC (with the fan stopped)

1 - 6.5 VDC (with the fan in operation)

(Same with the voltage between 6 (+)

and 4 (-) of CNMF)

SW2

CN2L

J41
J42

CN51

CN41

LED2

CN22

CN3C

CN01

FUSE (6.3A 250V)

LED3

CN90

SWE

CN105

CN44

CN4F

CN20

CNP

PC626

CNMF

LED1

HWE21010.book 41 ページ２０２１年６月２４日　木曜日　午前９時０分

Summary of Contents for SEZ Series

Page 1: ......

Page 2: ...G 1 Troubleshooting 32 1 CAUTIONS ON TROUBLESHOOTING 32 2 TROUBLESHOOTING 32 3 MALFUNCTION DIAGNOSIS METHOD BY REMOTE CONTROLLER 33 4 SELF DIAGNOSIS ACTION TABLE 36 5 TROUBLESHOOTING BY INFERIOR PHENOMENA 40 6 TEST POINT DIAGRAM 41 7 TROUBLE CRITERION OF MAIN PARTS 42 8 DC FAN MOTER FAN MOTOR INDOOR CONTROLLER BOARD 43 VIII DISASSEMBLY PROCEDURE 1 Disassembly Procedure 44 1 Control box 44 2 Thermi...

Page 3: ...HWE21010 GB HWE21010 book 2 ページ２０２１年６月２４日木曜日午前９時０分 ...

Page 4: ...ep both ends of the piping sealed until just before brazing Leave elbow joints etc in their packaging The refrigerant oil applied to flare and flange connections must be ester oil ether oil or alkylbenzene oil in a small amount If large amount of mineral oil enters that can cause deterio ration of refrigerant oil etc Charge refrigerant from liquid phase of gas cylinder Use a vacuum pump with a rev...

Page 5: ...f brazing the refrigerant pipes 12 When performing brazing work be sure to ventilate the room sufficiently Make sure that there are no hazardous or flammable materials nearby When performing the work in a closed room small room or similar location make sure that there are no refriger ant leaks before performing the work If refrigerant leaks and accumulates it may ignite or poisonous gases may be r...

Page 6: ...ents are being changed they shall be fit for the purpose and to the correct specification At all times the manufacturer s maintenance and service guidelines shall be followed If in doubt consult the manufacturer s technical department for assistance The following checks shall be applied to installations using flammable refrigerants The charge size is in accordance with the room size within which t...

Page 7: ...ional procedures shall be used However for flammable refrigerants it is important that best practice is followed since flammability is a consider ation The following procedure shall be adhered to remove refrigerant purge the circuit with inert gas evacuate purge again with inert gas open the circuit by cutting or brazing The refrigerant charge shall be recovered into the correct recovery cylinders...

Page 8: ...nders ensure that only appropriate refrigerant recovery cylinders are employed Ensure that the correct number of cylinders for holding the total system charge are available All cylinders to be used are designated for the recovered refrigerant and labelled for that refrigerant i e special cylinders for the recovery of refrigerant Cylinders shall be complete with pressure relief valve and associated...

Page 9: ...high tension side pressure of 5 3MPa G or over 2 Charge hose Use pressure performance of 5 09MPa G or over 3 Electronic weighing scale 4 Gas leak detector Use the detector for R134a R407 R410A or R32 5 Adaptor for reverse flow check Attach on vacuum pump 6 Refrigerant charge base 7 Refrigerant cylinder R32 or R410A refrigerant Cylinder with syphon 8 Refrigerant recovery equipment Electronic weighi...

Page 10: ...WE21010 GB 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 duct flange Air outlet Air inlet HWE21010 book 7 ページ２０２１年６月２４日木曜日午前９時０分 ...

Page 11: ...m temperature appears here Appears when the buttons are locked is enabled appears when the timer is disabled by the centralized control system Appears when the Weekly timer is enabled Appears while the units are operated in the energy save mode Will not appear on some models of indoor units Appears while the outdoor units are operated in the silent mode Appears when the built in thermistor on the ...

Page 12: ...D Operation settings will appear and it will stay lit for a certain period of time depending on the screen and does not perform its function except for the ON OFF button ON OFF lamp This lamp lights up in green while the unit is in operation It blinks while the remote controller is starting up or when there is an error Function button F1 Main display Press to change the operation mode Main menu Pr...

Page 13: ...mp range Operation locked Energy saving Auto return Schedule Energy data Mr SLIM only Energy data Unit time month day Data reset Operation Timer menu Energy saving Basic setting Main Sub Clock Clock Daylight saving time Administrator password Display setting Main display Black and white inversion setting Display details Contrast Brightness Language selection Operation setting Auto mode Wi Fi inter...

Page 14: ...rmation input Initialize maintenance info Settings menu Function setting Mr SLIM Function setting CITY MULTI Lossnay CITY MULTI only Rotation setting Mr SLIM only Check menu Error history menu Error history Preliminary error history Mr SLIM only Diagnosis Self check Remote controller check Smooth maintenance Mr SLIM only Request code Mr SLIM only Other menu Maintenance password Initialize remote c...

Page 15: ...terns can be set for each day Two types of weekly schedules can be set Clock setting is required Not valid when the On Off timer is enabled 1ºC increments OU silent mode Use to set the time periods in which priority is given to quiet operation of outdoor units over temperature control Set the Start Stop times for each day of the week Select the desired silent level from Normal Middle and Quiet Clo...

Page 16: ...aving time Sets the daylight saving time Display setting Main display Use to switch between Full and Basic modes for the Status display and the Main display The default setting is Full Black and white inversion setting Use to invert the colors of the display turning white background to black and black characters to white Contrast Brightness Use to adjust screen contrast and brightness Language sel...

Page 17: ...CTIONS GB HWE21010 Wireless remote controller J K LUÀRZ EXWWRQ KDQJHV XS GRZQ DLUÀRZ GLUHFWLRQ J K XZ X 2 21 EXWWRQ J K 6 7 6 1 EXWWRQ Z 8S RZQ EXWWRQV _ _ Z HHNO WLPHU 21 2 EXWWRQ J K HWE21010 book 14 ページ２０２１年６月２４日木曜日午前９時０分 ...

Page 18: ...9 16 Field drain pipe O D SEZ M25DA L 2 Galvanized sheets Plate fin coil Sirocco fan 2 0 096 5 5 7 0 9 0 194 247 318 5 25 35 50 Service Ref Mode Power supply Fan motor output Airflow Low Mid High Fan drive No Single phase 50Hz 220 240V dB A Input Mode Power supply Single phase 50Hz 220 240V Input Running Current External finish Galvanized sheets 700 27 9 16 200 7 7 8 18 40 Service Ref SEZ M35DA L ...

Page 19: ... control Thermostat Remote controller built in Fan drive No Sirocco fan 3 Fan motor output 0 096 Airflow Low Mid High 10 0 12 5 15 0 353 441 530 900 35 7 16 700 27 9 16 200 7 7 8 22 49 Service Ref SEZ M60DA L 2 dB A 29 33 36 30 34 37 31 35 38 32 36 39 Field drain pipe O D 32 1 1 4 Heat exchanger Plate fin coil Fan drive No Sirocco fan 4 Fan motor output 0 096 Mode Power supply Single phase 50Hz 22...

Page 20: ...Hz 220 240V Sirocco fan 4 Fan motor output 0 096 Airflow Low Mid High 12 0 16 0 20 0 424 565 706 Input Running Current External finish Galvanized sheets Heat exchanger Plate fin coil 1100 43 5 16 700 27 9 16 200 7 7 8 25 5 58 INDOOR UNIT dB A 29 34 39 30 35 40 31 36 41 32 37 42 Field drain pipe O D 32 1 1 4 External static pressure 5 25 35 50 Booster heater Operation control Thermostat Remote cont...

Page 21: ... NC 30 NC 20 60 0 65 0 70 0 63 125 250 500 1k 2k 4k 8k 2FWDYH EDQG SUHVVXUH OHYHO G G ȝ3D Octave band center frequencies Hz Approximate minimum audible limit on continuous noise 0 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 55 0 NC 60 NC 50 NC 40 NC 30 NC 20 60 0 65 0 70 0 63 125 250 500 1k 2k 4k 8k SEZ M25DA L 2 External static pressure 25Pa Power source 220 240V SEZ M25DA L 2 External sta...

Page 22: ...0 NC 50 NC 40 NC 30 NC 20 60 0 65 0 70 0 63 125 250 500 1k 2k 4k 8k 2FWDYH EDQG SUHVVXUH OHYHO G G ȝ3D Octave band center frequencies Hz Approximate minimum audible limit on continuous noise 0 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 55 0 NC 60 NC 50 NC 40 NC 30 NC 20 60 0 65 0 70 0 63 125 250 500 1k 2k 4k 8k SEZ M35DA L 2 External static pressure 25Pa Power source 220 240V SEZ M35DA L 2...

Page 23: ...NC 50 NC 40 NC 30 NC 20 60 0 65 0 70 0 63 125 250 500 1k 2k 4k 8k 2FWDYH EDQG SUHVVXUH OHYHO G G ȝ3D Octave band center frequencies Hz Approximate minimum audible limit on continuous noise 0 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 55 0 NC 60 NC 50 NC 40 NC 30 NC 20 60 0 65 0 70 0 63 125 250 500 1k 2k 4k 8k SEZ M50DA L 2 External static pressure 25Pa Power source 220 240V SEZ M50DA L 2 E...

Page 24: ...0 NC 50 NC 40 NC 30 NC 20 60 0 65 0 70 0 63 125 250 500 1k 2k 4k 8k 2FWDYH EDQG SUHVVXUH OHYHO G G ȝ3D Octave band center frequencies Hz Approximate minimum audible limit on continuous noise 0 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 55 0 NC 60 NC 50 NC 40 NC 30 NC 20 60 0 65 0 70 0 63 125 250 500 1k 2k 4k 8k SEZ M60DA L 2 External static pressure 25Pa Power source 220 240V SEZ M60DA L 2...

Page 25: ... 0 65 0 70 0 63 125 250 500 1k 2k 4k 8k 2FWDYH EDQG SUHVVXUH OHYHO G G ȝ3D Octave band center frequencies Hz Approximate minimum audible limit on continuous noise 0 0 5 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 55 0 NC 60 NC 50 NC 40 NC 30 NC 20 60 0 65 0 70 0 63 125 250 500 1k 2k 4k 8k SEZ M71DA L 2 External static pressure 25Pa Power source 220 240V SEZ M71DA L 2 External static pressure 5P...

Page 26: ...iddle Low Rated point Limit High Middle Low 0 10 20 30 40 50 60 70 80 4 5 6 7 8 9 10 External static pressure Pa Airflow rate m3 min SEZ M25DA L 2 External static pressure 35Pa Powersource 220 240V Rated point Limit High Middle Low 0 10 20 30 40 50 60 70 80 4 5 6 7 8 9 10 External static pressure Pa Airflow rate m3 min SEZ M25DA L 2 External static pressure 50Pa Powersource 220 240V Rated point IN...

Page 27: ... pressure 25Pa Powersource 220 240V Rated point Limit High Middle Low 0 10 20 30 40 50 60 70 80 6 7 8 9 10 11 12 External static pressure Pa Airflow rate m3 min SEZ M35DA L 2 External static pressure 35Pa Powersource 220 240V Rated point Limit High Middle Low 0 10 20 30 40 50 60 70 80 6 7 8 9 10 11 12 External static pressure Pa Airflow rate m3 min SEZ M35DA L 2 External static pressure 50Pa Power...

Page 28: ...ssure 25Pa Powersource 220 240V Rated point Limit High Middle Low 0 10 20 30 40 50 60 70 80 8 9 10 11 12 13 14 15 16 External static pressure Pa Airflow rate m3 min SEZ M50DA L 2 External static pressure 35Pa Power source 220 240V Rated point Limit High Middle Low 0 10 20 30 40 50 60 70 80 8 9 10 11 12 13 14 15 16 External static pressure Pa Airflow rate m3 min SEZ M50DA L 2 External static pressu...

Page 29: ...pressure 25Pa Power source 220 240V Rated point Limit High Middle Low 0 10 20 30 40 50 60 70 80 9 10 11 12 13 14 15 16 17 18 19 External static pressure Pa Airflow rate m3 min SEZ M60DA L 2 External static pressure 35Pa Power source 220 240V Rated point Limit High Middle Low 0 10 20 30 40 50 60 70 80 9 10 11 12 13 14 15 16 17 18 19 External static pressure Pa Airflow rate m3 min SEZ M60DA L 2 Exte...

Page 30: ...ted point Limit High Middle Low 0 10 20 30 40 50 60 70 80 11 12 13 14 15 16 17 18 19 20 21 External static pressure Pa Airflow rate m3 min SEZ M71DA L 2 External static pressure 35Pa Power source 220 240V Rated point Limit High Middle Low 0 10 20 30 40 50 60 70 80 11 12 13 14 15 16 17 18 19 20 21 External static pressure Pa Airflow rate m3 min SEZ M71DA L 2 External static pressure 50Pa Power sour...

Page 31: ...inal block Indoor outdoor connecting line Suspension bolt hole 4 14X30 Slot Air filter Control box 2XE Ø2 9 2X2 Ø2 9 L Ø2 9 Knockout hole Ø27 Indoor outdoor connecting line Knockout hole Ø27 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 ...

Page 32: ...ace Bottom of indoor unit Electric box Min 300 mm Viewed from the direction of the arrow B Access door 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 ...

Page 33: ...ng 2 Indoor and outdoor connecting wires are made with polarities make wiring matching terminal numbers S1 S2 S3 3 Symbols used in wiring diagram are Connector Terminal Relay connector Heavy dotted line Field wiring Thin dotted line Optional parts MODEL NAME SW2 SEZ M25DA L 2 SEZ M35DA L 2 SW5 ON 5 8 4 7 3 6 2 1 ON 5 8 4 7 3 6 2 1 ON 5 4 3 2 1 ON 5 4 3 2 1 SEZ M50DA L 2 SEZ M60DA L 2 SEZ M71DA L 2...

Page 34: ... SEZ M71DA L 2 Pipe temperature thermistor liquid 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 HWE21010 book 31 ページ２０２１年６月２４日木曜日午前９時０分 ...

Page 35: ...elow before investigating details Judge what is wrong and take a corrective action according to VII 1 4 SELF DIAGNOSIS ACTION TABLE Conduct troubleshooting and ascertain the cause of the trouble according to VII 1 5 TROUBLESHOOTING BY INFERIOR PHENOMENA Reset check code logs and restart the unit after finishing service There is no abnormality in electrical component controller board remote control...

Page 36: ... Z X_ 1 A J Z K B X _ XZ Z X_ X X X X X X X X X X _ 1XPEHU RI EOLQNV EHHSV LQ SDWWHUQ LQGLFDWHV WKH FKHFN J K 1XPEHU RI EOLQNV EHHSV LQ SDWWHUQ LQGLFDWHV J K X X X _ XZ Z X_ X X X X X X X X _ 1XPEHU RI EOLQNV EHHSV LQ SDWWHUQ LQGLFDWHV WKH FKHFN J K 1XPEHU RI EOLQNV EHHSV LQ SDWWHUQ LQGLFDWHV J K _ HWE21010 book 33 ページ２０２１年６月２４日木曜日午前９時０分 ...

Page 37: ...t of outdoor unit thermistors Compressor 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 discha...

Page 38: ... which is connected to the outdoor unit refrigerant address 0 Indicates state of communication between the indoor and outdoor units Make sure that this LED is always blinking LED 1 power for microcomputer LED 2 power for remote controller LED 3 communication between indoor and outdoor units For description of each LED LED1 2 3 provided on the indoor controller refer to the following table HWE21010...

Page 39: ... For characteristics refer to P1 above Check contact failure of connector CN44 on the indoor controller board Refer to VII 1 6 Turn the power on again and check restart after inserting connector again 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 Check ...

Page 40: ...tor is defective Indoor controller board is defective Defective outdoor fan control Overcharge of refrigerant Defective refrigerant circuit clogs Bypass circuit of outdoor unit is defective Cooling or drying mode Check clogging of the filter Remove shields Refer to VII 1 8 DC FAN MOTOR FAN MOTOR INDOOR CONTROLLER BOARD Check outdoor fan motor Check operating condition of refrigerant circuit Heatin...

Page 41: ...d for three minutes Error code E4 Indoor controller board cannot receive any signal from remote controller for two minutes Error code E4 Check disconnection or looseness of indoor unit or transmission wire of remote controller Set one of the remote controllers main if there is no problem with the action above Check wiring of remote controller Total wiring length max 500m Do not use cable 3 or more...

Page 42: ...se Countermeasure FB Fb Indoor controller board Abnormal if data cannot be read normally from the nonvolatile memory of the indoor controller board Defective indoor controller board Replace indoor controller board E1 or E2 6201 or 6202 Remote controller control board Abnormal if data cannot be read normal ly from the nonvolatile memory of the remote controller control board Error code E1 Abnormal ...

Page 43: ...efective 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 Mis wiring of remote controller wires Under twin triple indoor unit system 2 or more indoor units are wired together Refrigerant address for outdoor unit is wrong or not set Under grouping control system there are so...

Page 44: ...oat switch CN44 Thermistor liquid condenser evaporator temperature CN20 Thermistor Inlet temperature CN3C Indoor outdoor transmission 0 24 VDC 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 200 VAC CN2L LOSSNAY CN90 Wireless remote controller 1 Vsp Voltage between the C626 pins 0 VDC with the fan stopped 1 6 ...

Page 45: ...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 rotati...

Page 46: ...r CNMF Measure the voltage in the indoor controller circuit board TEST POINT VDC between 1 and 4 of the fan connector VDC DC310 340V TEST POINT 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 motor Is...

Page 47: ...M71DA L 2 Exercise caution when removing heavy parts 1 Removing the control box cover 1 Remove the two fixing screws on the cover A to remove it Fig 1 Fig 2 A 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 Fig 3 SEZ M DA model only M71DA L model only B C HWE21010 book 44 ページ２０２１年６月２４日木曜日午前９時０分 ...

Page 48: ...e 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 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 Fig 4 Fig 5 Fig 6 D E a a a a a Tab Insulation material E Insulation material E SEZ M35 50 60 71 SEZ M25 HWE21010...

Page 49: ...ng to the proce 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 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 Fig 7 Fig 8 F G H HWE21010 book 46 ページ２０２１年６月２４日木曜日午前９時０分 ...

Page 50: ...the direction of arrow Fig 11 2 Remove the four fan case fixing screws to take the top half of the fan casing off Fig 12 2 Removing the fan casing bottom half 1 Squeeze the tabs on the fan casing to remove it in the direction of arrow Fig 10 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 2 Remove the fixing screws ...

Page 51: ...Remove the two fixing screws on the bearing cover K to remove it K 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 Fig 15 Fig 16 L M H...

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