Mitsubishi Electric MSZ-DW25VF Service Manual Download

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CONTENTS

1. TECHNICAL CHANGES ······························2

2. PART NAMES AND FUNCTIONS ··················3

3. SPECIFICATION ········································4

4. NOISE CRITERIA CURVES ··························5

5. OUTLINES AND DIMENSIONS ·····················6

6. WIRING DIAGRAM ·····································7

7. REFRIGERANT SYSTEM DIAGRAM ·············8

8. SERVICE FUNCTIONS ································9

9. MICROPROCESSOR CONTROL ················ 11

10. TROUBLESHOOTING ······························· 15

11. DISASSEMBLY INSTRUCTIONS ················· 27

INDOOR UNIT

SERVICE MANUAL

No. OBH905

PARTS CATALOG (OBB905)

Models

MSZ-DW25VF

ER1

ET1

MSZ-DW35VF

ER1

ET1

MSZ-DW50VF

ER1

ET1

Outdoor unit service manual
MUZ-DW·VF Series (OBH906)

MXZ-HA∙VF Series (OBH828)

Summary of Contents for MSZ-DW25VF

Page 1: ...RAM 7 7 REFRIGERANT SYSTEM DIAGRAM 8 8 SERVICE FUNCTIONS 9 9 MICROPROCESSOR CONTROL 11 10 TROUBLESHOOTING 15 11 DISASSEMBLY INSTRUCTIONS 27 INDOOR UNIT SERVICE MANUAL No OBH905 PARTS CATALOG OBB905 Models MSZ DW25VF E1 ER1 ET1 MSZ DW35VF E1 ER1 ET1 MSZ DW50VF E1 ER1 ET1 Outdoor unit service manual MUZ DW VF Series OBH906 MXZ HA VF Series OBH828 ...

Page 2: ...he specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products We will not be held responsible for mechanical failure system malfunction unit breakdown or accidents caused by failure ...

Page 3: ...ft or left rear piping 1 5 Battery AAA for remote controller 2 2 PART NAMES AND FUNCTIONS Operation indicator lamp Remote control receiving section Horizontal vane Air inlet Front panel Air outlet Heat exchanger Emergency operation switch Remote controller Air cleaning ﬁlter V Blocking Filter option Display section Fan guard Air ﬁlter Air purifying filter OBH905 ...

Page 4: ... 45 High 37 38 40 Med 30 31 36 Low 21 22 28 Heating Super High 43 44 47 High 37 37 41 Med 30 30 34 Low 21 21 27 Fan speed Cooling Super High rpm 1 080 1 200 1 140 High 880 930 950 Med 710 730 800 Low 520 520 660 Heating Super High 1 120 1 150 1 160 High 900 900 950 Med 710 710 800 Low 500 500 670 Fan speed regulator 4 Remote controller model MS21A NOTE Test conditions are based on ISO 5151 Cooling...

Page 5: ... NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz COOLING FUNCTION SPL dB A LINE Super High FAN SPEED HEATING Test conditions Cooling Dry bulb temperature 27 C Wet bulb temperature 19 C Heating Dry bulb temperature 20 C 45 47 NC 10 MSZ DW35VF 4 NOISE CRITERIA CURVES MSZ DW50VF 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC...

Page 6: ...ared connection Ø9 52 Drain hose Insulation Ø29 Connected part Ø16 O D 232 5 69 41 799 785 7 290 120 630 49 57 80 42 43 69 57 42 7 103 130 100 5 7 225 225 80 5 80 5 61 5 59 5 340 338 41 42 249 248 21 5 3 167 157 207 5 206 5 172 14 46 Air in Installation plate Piping Drain hose Air out 11 26 Oblong hole 11 20 Oblong hole Installation plate Indoor unit Wall hole Ø65 140 57 18 OBH905 ...

Page 7: ...Konektör Terminal bloğu NOTLAR 1 Dış ünite elektronik kablolaması için dış ünite elektronik kablo devre şemasını referans alınız 2 Sadece bakır besleme kablosu kullanın 3 Sembolleri gösterir DIŞ ÜNİTEYE SİGORTA T3 15AL250V FAN MOTORU KANAT MOTORU YATAY VARİSTÖR RESİSTÖR ODA SICAKLIK TERMİSTÖRÜ BORU SICAKLIK TERMİSTÖRÜ ANA BORU SICAKLIK TERMİSTÖRÜ YARDIMCI TERMİNAL BLOĞU OBH905 ...

Page 8: ...perature thermistor RT11 Flared connection Refrigerant flow in cooling Refrigerant flow in heating Refrigerant pipe ø9 52 with heat insulator Refrigerant pipe ø6 35 with heat insulator Indoor coil thermistor RT12 Indoor coil thermistor RT13 Unit mm 7 REFRIGERANT SYSTEM DIAGRAM OBH905 ...

Page 9: ...ration 3 units operation 4 units operation No 1 unit No modification Same as at left Same as at left Same as at left No 2 unit Solder J2 Same as at left Same as at left No 3 unit Solder J4 Same as at left No 4 unit Solder both J2 and J4 How to set the remote controller exclusively for particular indoor unit After you turn the breaker ON the first remote controller that sends the signal to the indo...

Page 10: ...rt Therefore the special countermeasures are required to prevent the main voltage drop or the rush of the starting current by adding to the system that allows the units to start one by one 8 3 AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller the operation mode the set temperature and the fan speed are memorized by the indoor electronic control P C board AUTO REST...

Page 11: ...re The room temperature is approaching the set tem perature About 1 to 2 C from set temperature MSZ DW25 35VF Standby mode only during multi system operation Lit Blinking Not lit INDOOR UNIT DISPLAY SECTION TIME set buttons RESET button VANE control button Signal transmitting section Operation display section Temperature buttons OFF ON stop operate button FAN speed control button Operation select ...

Page 12: ...FF ON stop operate button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select HEAT mode with Operation select button 3 Press Temperature buttons TOO WARM or TOO COOL button to select the desired temperature The setting range is 16 31 C 1 Cold air prevention control When the compressor is not operating or is starting and the temperature of indoor heat exchanger and or the...

Page 13: ...4 VANE AUTO mode In VANE AUTO mode the microprocessor automatically determines the vane angle to make the optimum room tempera ture distribution In COOL and DRY operation In HEAT operation Vane angle is fixed to Horizontal position Vane angle is fixed to Angle 4 Horizontal position 5 STOP operation OFF and ON TIMER standby In the following cases the horizontal vane returns to the closed position a...

Page 14: ...rmal operation will start NOTE Do not press the emergency operation switch during normal operation Operation mode COOL HEAT Set temperature 24 C 24 C Fan speed Med Med Horizontal vane Auto Auto The operation mode is indicated by the Operation Indicator lamp as follows Operation Indicator lamp EMERGENCY COOL EMERGENCY HEAT STOP Lit Not lit 9 9 3 MINUTE TIME DELAY OPERATION When the system turns OFF...

Page 15: ...voltage drop caused by the battery replacement 3 Do not use the leaking batteries Press RESET button with a fine tipped object and then use the remote controller Remove the back lid and insert batteries Then reattach the back lid 10 1 CAUTIONS ON TROUBLESHOOTING 1 Before troubleshooting check the following 1 Check the power supply voltage 2 Check the indoor outdoor connecting wire for miswiring 2 ...

Page 16: ...the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller The outdoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the table of outdoor unit failure mode recall function Refer to outdoor unit service manual Make sure to check at least 2 consecutive blinking cycles 3 Repair the failure parts Yes...

Page 17: ...ics of the main indoor coil ther mistor the sub indoor coil thermistor 10 7 3 time blink 2 5 second OFF Serial signal The serial signal from outdoor unit is not re ceived for a maximum of 6 minutes Refer to 10 6 How to check miswiring and serial signal error 11 time blink 2 5 second OFF Indoor fan motor The rotational frequency feedback signal is not emitted for the 12 seconds after the indoor fan...

Page 18: ...me blink Cause Indoor unit Trouble of indoor unit control system Upper lamp 5 time blink Cause Outdoor unit Outdoor power sys tem abnor mality Upper lamp 6 time blink Cause Outdoor unit Trouble of thermistor in outdoor unit Upper lamp 7 time blink Cause Outdoor unit Trouble of outdoor con trol system Upper lamp 14 time blink or more Cause Outdoor unit Other ab normality Indoor Out door unit Troubl...

Page 19: ...m pressor stops for overcurrent protection or start up failure protection within 1 minute after start up Refer to How to check of in verter compressor Refer to outdoor unit service manual Check the stop valve 6 Outdoor thermistors Upper lamp blinks 6 time blink 2 5 second OFF The outdoor thermistors short or open circuit during the compressor operation Refer to Check of outdoor thermistor Refer to...

Page 20: ... Part temperature 10 30 C Color of the lead wire Normal RED SKY 235 255 Ω SKY SKY BLUE SKY SKY RED SKY SKY ROTOR MSZ DW25VF MSZ DW35VF OPERATION INDICATOR No Abnormal point Operation indicator lamp Symptom Condition Remedy 1 MXZ type Operation mode setting Upper lamp lights and right lamp blinks 2 5 second OFF Outdoor unit operates but indoor unit does not operate The operation mode of the each in...

Page 21: ...s pressed the voltage measured at 2 above goes 0 V DC although the indoor P C board is normal Does the voltage between CN211 and on the power P C board rise to the range of 3 to 6 V DC within 12 seconds after the emergency operation switch is pressed Replace the indoor fan motor Yes No The indoor fan motor error has occurred and the indoor fan repeats 12 second ON and 30 second OFF 3 times and the...

Page 22: ...tart type within the range of 1 m 2 Yes No Reinstall the unit away from lights Attach a filter on receiving part 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera or a camera phone It is normal if the LED of the signal transmitting section lights up when the OFF ON stop operate button on the remote controller is pressed However ...

Page 23: ...eplace the vane motor and the indoor electronic control P C board 1 The fan motor connector s lead wire is red whereas is black 2 Connect of the multimeter to fan motor connector s lead wire and to lead wire otherwise the resistance cannot be measured properly 3 Please replace the fuse after removing the indoor power P C board from the electrical box Is there approximately 5 V DC between 5 V and G...

Page 24: ... power supply is turned ON Touch CN10A and GND with multimeter probes and start the emergency operation During the emergency opera tion does DC 2V or less occur for 2 seconds between CN10A and GND on the indoor elec tronic control P C board No Does the indoor OPERATION INDICATOR lamp upper blink continuously 6 minutes after the emergency operation starts No Does the outdoor LED light up Replace th...

Page 25: ...indoor terminal block S1 and S2 Confirmation of power voltage Replace the indoor electronic control P C board 2 Be careful of the residual voltage of smoothing capacitor Replace the outdoor control P C board 2 Is there any error of the indoor outdoor connecting wire such as the damage of the wire intermediate connection poor contact to the terminal block Replace the indoor outdoor connecting wire ...

Page 26: ...he installation condition combination of specific conditions such as antennas or wiring Check the following before asking for service 1 Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave 2 Channel frequency broadcast station affected by the electromagnetic noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outd...

Page 27: ... Connector to Indoor fan motor CN211 Connector to Terminal block CN201 3 6 VDC 15 VDC GND High voltage DC 325 VDC 0 or 15 VDC Room temperature thermistor RT11 CN111 Connector to Indoor coil ther mistor RT12 RT13 CN112 Vane motor CN151 Connector to indoor power P C board CN10A 12V DC 5V DC Emergency operation switch E O SW SW1 Indoor electronic control P C board GND Timer short mode point Refer to ...

Page 28: ...locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever Detaching method of the terminal with locking mechanism The terminal which has the locking mechanism can be detached as shown below There are 2 types of the terminal with locking mechanism The terminal without locking mechanism can be ...

Page 29: ...he electrical cover and remove the electrical cover 8 Disconnect the following connectors Indoor power P C board CN211 Indoor fan motor CN201 TAB1 TAB2 Terminal block CN20A To the indoor electronic control P C board 9 Remove the upper catch of the electrical box and pull out the electrical box To attach the electrical box pass the wires connecting the indoor power P C board and the indoor electron...

Page 30: ...the back side of the control P C board holder 5 Unhook the catches of the control P C board holder and open the control P C board holder 6 Remove the indoor electronic control P C board from the control P C board holder 4 Removing the vane motor 1 Remove the panel Refer to section 1 Remove the corner box 2 Remove the control P C board holder and the electrical box Refer to section 2 3 Pull out the...

Page 31: ...connect the lead wire of the fan motor from the motor band 10 Disengage the hooks of the motor band and remove the motor band Pull out the indoor fan motor 11 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it 12 Remove the screws fixing the left side of the heat exchanger 13 Lift the heat exchanger and pull out th...

Page 32: ...hen fixing the indoor coil thermistor to the clip shape holder shape part the lead wire should point down 1 Set the indoor coil thermistor in the center of the clip shape part 2 Check the marked mounting position 3 Mount the clip shape part Position and procedure for mounting the clip shape part About the same length Copyright 2021 MITSUBISHI ELECTRIC CORPORATION Published Oct 2021 No OBH905 Made ...

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