Mitsubishi Electric MSZ-LN18VGB - E1 Service Manual Download Page 50

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Summary of Contents for MSZ-LN18VGB - E1

Page 1: ...R UNIT SERVICE MANUAL No OBH766 REVISED EDITION B CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 3 3 SPECIFICATION 4 4 NOISE CRITERIA CURVE 5 5 OUTLINES AND DIMENSIONS 7 6 WIRING DIAGRAM 8 7 REFRIGERANT SYSTEM DIAGRAM 9 8 SERVICE FUNCTIONS 10 9 MICROPROCESSOR CONTROL 12 10 TROUBLESHOOTING 22 11 DISASSEMBLY INSTRUCTIONS 39 PARTS CATALOG OBB766 NOTE RoHS compliant products have G mark on ...

Page 2: ...lure to follow the instructions TECHNICAL CHANGES 1 These models are compatible with the outdoor units with low standby power control Connecting these models to the MUZ LN VG series outdoor units enables the low standby power control Refer to the techni cal guide about the low standby power control These models may be connected to the MUZ LN VG series after once connected to the MXZ series and ope...

Page 3: ...SZ LN25VGR MSZ LN35VGW MSZ LN35VGV MSZ LN35VGB MSZ LN35VGR MSZ LN50VGW MSZ LN50VGV MSZ LN50VGB MSZ LN50VGR MSZ LN60VGW MSZ LN60VGV MSZ LN60VGB MSZ LN60VGR Installation plate 1 Installation plate fixing screw 4 25 mm 5 Wireless remote controller 1 Felt tape For left or left rear piping 1 Corner box R 4 Corner box L 4 Battery AAA for remote controller 2 Air cleaning filter Deodorizing filter black 1...

Page 4: ...Super High dB A 42 43 46 49 High 36 36 39 45 Med 29 29 35 41 Low 23 24 31 37 Silent 19 19 27 29 Heating Super High dB A 45 45 47 49 High 36 36 39 45 Med 29 29 34 41 Low 24 24 29 37 Silent 19 19 25 29 Fan speed Cooling Super High rpm 1 030 1 090 1 160 1 280 High 820 820 940 1 080 Med 700 700 820 940 Low 610 610 730 820 Silent 500 500 600 700 Heating Super High rpm 1 190 1 150 1 280 1 280 High 800 8...

Page 5: ...UNCTION SPL dB A LINE Super High FAN SPEED HEATING 46 47 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz NC 10 NOISE CRITERIA CURVE 4 COOLING FUNCTION SPL dB A LINE Super High FAN SPEED HEATING 43 45 90 80 70 60 50 40 30 20 10 63 125 250 500 1000 2000 4000 8000 NC 60...

Page 6: ...00 NC 60 NC 50 NC 40 NC 30 NC 20 NC 70 OCTAVE BAND SOUND PRESSURE LEVEL dB re 0 0002 MICRO BAR BAND CENTER FREQUENCIES Hz NC 10 MSZ LN60VGW MSZ LN60VGB MSZ LN60VGV MSZ LN60VGR Test conditions Cooling Dry bulb temperature 27 C Wet bulb temperature 19 C Heating Dry bulb temperature 20 C INDOOR UNIT WALL MICROPHONE 0 8m 1m OBH766B ...

Page 7: ...D CONNECTION ø12 7 DRAIN HOSE INSULATION ø28 CONNECTED PART ø16 O D T01 MSZ LN18 25 35 50VGV VGB VGR MSZ LN60VGV VGB VGR PIPING INSULATION ø35 O D LIQUID LINE ø6 35 0 5m FLARED CONNECTION ø6 35 GAS LINE ø9 52 0 45m FLARED CONNECTION ø9 52 DRAIN HOSE INSULATION ø28 CONNECTED PART ø16 O D T02 PIPING INSULATION ø37 O D LIQUID LINE ø6 35 0 5m FLARED CONNECTION ø6 35 GAS LINE ø9 52 0 45m FLARED CONNECT...

Page 8: ...SZ LN50VGV MSZ LN50VGB MSZ LN50VGR MSZ LN18VGW MSZ LN25VGW MSZ LN35VGW MSZ LN60VGW MSZ LN18VGV MSZ LN25VGV MSZ LN35VGV MSZ LN60VGV MSZ LN18VGB MSZ LN25VGB MSZ LN35VGB MSZ LN60VGB MSZ LN18VGR MSZ LN25VGR MSZ LN35VGR MSZ LN60VGR OBH766B ...

Page 9: ... exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe ø9 52 LN50 ø12 7 LN60 with heat insulator Refrigerant pipe ø6 35 with heat insulator Indoor coil thermistor RT12 main Indoor coil thermistor RT13 sub Refrigerant flow in cooling Refrigerant flow in heating MSZ LN18VGW MSZ LN25VGW MSZ LN35VGW MSZ LN18VGV MSZ LN25VGV MSZ LN35VGV MSZ LN18VGB MSZ LN25VGB M...

Page 10: ...e controller that first sends a signal to an indoor unit will be regarded as the remote controller for the indoor unit Once they are set the indoor unit will only receive the signal from the assigned remote controller afterwards SERVICE FUNCTIONS 8 8 3 SETTING THE INSTALLATION POSITION Be sure to set the remote controller according to the installed position of the indoor unit Installation position...

Page 11: ...ransmission of any operational data from the system until the End user registers and accepts the terms and con ditions of the Wi Fi service This Wi Fi interface should not be installed and connected to any Mitsubishi Electric system which is to provide application critical cooling or heating At the time of relocation or disposal reset the Wi Fi interface to the factory default This Wi Fi interface...

Page 12: ...ote controller Slide it down further to get to the weekly timer buttons WEEKLY TIMER set buttons TIME TIMER set buttons FORWARD button BACKWARD button RESET button i save button NIGHT MODE button SENSOR i see button VANE CONTROL button WIDE VANE button INDOOR UNIT DISPLAY SECTION Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state The...

Page 13: ...outdoor heat exchanger becomes too low The compressor stops once the indoor outdoor fans stop the 4 way valve reverses and the compressor re starts This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes 9 5 AUTO CHANGE OVER AUTO MODE OPERATION Once desired temperature is set unit operation is switched automatically between COOL and HEAT operation Mode se...

Page 14: ...pping motors for the horizontal vanes The rotating direction speed and angle of the motor are controlled by pulse signals approximately 12 V transmitted from indoor microprocessor 2 The horizontal vane angle and mode change as follows by pressing VANE CONTROL button Horizontal position 4 In COOL and DRY operation Vane angle is fixed to Horizontal position In HEAT operation Vane angle is fixed to A...

Page 15: ... and the set temperature and operates the POWERFUL mode The POWERFUL mode is cancelled automatically 15 minutes after operation starts or when POWERFUL button is pressed once again within 15 minutes after operation starts The operation mode returns to the mode prior to POWERFUL operation To cancel this operation manually select a different mode or press one of the following but tons within 15 minu...

Page 16: ...er setting a Press OFF TIMER button during operation b Set the time of the timer using TIME SET buttons and Each time FORWARD button is pressed the set time increases by 10 minutes each time BACKWARD but ton is pressed the set time decreases by 10 minutes 2 To release the timer To release ON timer press ON TIMER button To release OFF timer press OFF TIMER button TIMER is cancelled and the display ...

Page 17: ...sing adjusts the tem perature Hold down the button to change the time quickly The temperature can be set between 16 C and 31 C at COOL operation The temperature can be set between 10 C and 31 C at HEAT operation blinks Pressing selects the day of the week to be set Pressing selects the setting number E g Mon Tue Sun and 1 are selected All days can be selected NOTE The simple ON OFF timer setting i...

Page 18: ... may not be sensed A heat source and the air conditioner are more than 6 m apart A heat source does not move for a long time Do not touch the i see SENSOR This may cause malfunction of the i see SENSOR The intermittent operating sound is a normal sound produced when the i see SENSOR is moving from side to side 9 9 i see CONTROL MODE AND ABSENCE DETECTION In the i see control mode the room temperat...

Page 19: ...tion automatically changes the operation to No occupancy energy saving mode or No occupancy Auto OFF mode when nobody is in the room 9 10 AIRFLOW CONTROL MODE AIRFLOW CONTROL mode offers air conditioning according to a location of an occupant in a room detected by i see SENSOR 1 Press DIRECTION button during COOL DRY HEAT or AUTO mode to activate the AIRFLOW CONTROL mode This mode is only availabl...

Page 20: ...AT mode i save operation is 10 31 C 2 groups of setting can be saved One for COOL ECONO COOL one for HEAT 2 How to cancel operation Press i save button again i save operation can also be cancelled by pressing POWERFUL button or OPERATION SELECT button to change the operation mode The same setting is select from the next time by simply pressing i save button 9 11 NIGHT MODE OPERATION NIGHT MODE cha...

Page 21: ...Do not press EMERGENCY OPERATION switch during normal operation Operation mode COOL HEAT Set temperature 24 C Fan speed Med Horizontal vane Auto The operation mode is indicated by the Operation Indicator lamp as following Operation Indicator lamp EMERGENCY COOL EMERGENCY HEAT STOP Lit Not lit 9 16 3 MINUTE TIME DELAY OPERATION When the system turns OFF compressor will not restart for 3 minutes as ...

Page 22: ...he electronic control P C board seems to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 4 When troubleshooting Refer to 10 2 10 3 and 10 4 4 How to replace batteries Weak batteries may cause the remote controller malfunction In this case replace the batteries to operate the remote controller normally Lead wiring Connector housing Inco...

Page 23: ...MERGENCY OPERATION switch so that the memorized abnormal condition is deleted 4 Release the failure mode recall function according to Releasing the failure mode recall function men tioned above Yes Blinks No OFF NOTE 1 Make sure to release the failure mode recall function after it is set up otherwise the unit cannot operate properly 2 If the abnormal condition is not deleted from the memory the la...

Page 24: ...ote controller is set to the failure mode recall function The air purifying device or i see SENSOR might be abnormal Check if the air purifying device or i see SENSOR is abnormal according to the following procedures ON OFF Beeps Repeated cycle Repeated cycle 2 5 second OFF Blinking at 0 5 second interval Beeps Repeated cycle 2 5 second OFF Blinking at 0 5 second interval Beeps After repairing the...

Page 25: ...etween CN1T1 and GND on the electronic P C board falls significantly 0 4V 0 5ms 3 time flash Refer to 10 6 Check of AIR PURIFYING power Abnormal electric discharge error 1 When the voltage between CN1T1 and GND on the electronic P C board falls by 1 2V below the normal voltage value 2 5V 2 time flash Electrode Spark discharge Electrode Electrode 1 time flash AIR PURIFYING power control When the vo...

Page 26: ...s Cause Indoor Outdoor unit Miswiring or trouble of se rial signal POWER lamp 2 time flash Cause Indoor unit Trouble of room temperature indoor coil thermistor POWER lamp 3 time flash Cause Indoor unit Trouble of indoor fan motor POWER lamp 4 time flash Cause Indoor unit Trouble of indoor unit control system POWER lamp 5 time flash Cause Outdoor unit Outdoor power sys tem abnor mality POWER lamp 6...

Page 27: ...instruction manuals for the router and the device such as a smartphone and enable the Internet access There is a problem in communication between the air conditioner and the Wi Fi interface Check whether the air conditioner can be oper ated with a remote controller If the air conditioner does not operate Check indoor outdoor connect ing wire and the power supply Check the indoor power P C board an...

Page 28: ...rt 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 POWER lamp flashes 6 time flash 2 5 second OFF The outdoor thermistors short or open circuit during the compressor operation Refer to Check of outdoor thermistor Refer to outdoor unit service manual 7 Outdoor control s...

Page 29: ...0 7 Test point diagram and voltage Indoor electronic control P C board for the chart of thermistor Indoor fan motor MF Check 10 6 Check of indoor fan motor Vane motor MV1 HORIZONTAL Measure the resistance between the terminals with a tester Temperature 10 30 C Color of the lead wire Normal RED SKY 262 328 Ω Vane motor MV2 VERTICAL Measure the resistance between the terminals with a tester Temperat...

Page 30: ...ressed 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 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 then stops...

Page 31: ... controller Refer to 8 2 Check if the unit operates with the remote controller Does the unit operate with the remote controller Yes No OK Measure the voltage between display and receiver P C board connector CN301 No 1 and No 2 when the remote controller button is pressed Is the voltage approximately 4 V DC 5 V DC No Yes Replace the indoor electronic control P C board 1 Look at the image of the sig...

Page 32: ... P C board Measure the resistance of the vane motor coil Refer to 10 5 Short circuit Replace 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 tester 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...

Page 33: ...Does the indoor POWER lamp blink continuously 6 minutes after the emergency operation starts No Does the outdoor LED light up Replace the indoor electronic control P C board Replace the indoor electronic control P C board Replace the indoor power P C board Yes Yes Does the outdoor LED blink 6 times Yes Confirm that the thermostat is OFF and wiring is not loose No Does DC 6 V or more occur between ...

Page 34: ...e wiring Press EMERGENCY OPERATION switch once Does the indoor POWER lamp light up Confirmation of the power to the indoor unit Yes No Is serial signal error indicated 6 minutes later Yes No Is there any miswiring poor contact or wire disconnection of the indoor outdoor connect ing wire Yes Correct them No A Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not mis...

Page 35: ...re 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 No Does the LED on the outdoor control P C board repeat 3 6 second OFF and 0 8 second ON quick blinking LED indication for communication status Communication status is indicated by the LED Blinking normal communicati...

Page 36: ...1 on the indoor electronic control P C board High voltage approximately 5 8kV is generated during AIR PURIFYING power operation Pay careful attention and never touch the air purifying device and the high voltage lead part Yes No OFF Continuously blinking OFF Continuously blinking Does AIR PURIFYING lamp flash 2 time with unit stopping Turn ON the power supply Replace the indoor electronic control ...

Page 37: ...e 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 outdo...

Page 38: ...hermistor RT11 CN111 Indoor coil thermistor RT12 RT13 CN112 Indoor power P C board Indoor electronic control P C board Display and receiver P C board Switch buzzer P C board 10 7 TEST POINT DIAGRAM AND VOLTAGE 5 V DC Interlock switch CN2T1 Air purifying device CN1T1 12 V DC MSZ LN18VGW MSZ LN25VGW MSZ LN35VGW MSZ LN50VGW MSZ LN60VGW MSZ LN18VGV MSZ LN25VGV MSZ LN35VGV MSZ LN50VGV MSZ LN60VGV MSZ L...

Page 39: ...king mechanism Detaching points The terminal which has the locking mechanism can be detached as shown below There are 2 types Refer to 1 and 2 of the terminal with locking mechanism The terminal without locking mechanism can be detached by pulling it out Check the shape of the terminal before detaching DISASSEMBLY INSTRUCTIONS 11 DISASSEMBLY INSTRUCTIONS MSZ LN18VGW MSZ LN25VGW MSZ LN35VGW MSZ LN5...

Page 40: ...the front panel and the outer vanes R L horizontal 2 Remove the panel U 3 Remove the 2 screws of the panel R and pull the top of the panel R toward you to remove How to install the panel R Photos 1 2 3 1 Install the panel R from the bottom to the top 2 Install the 2 screws in the panel R Removing the panel L Photos 1 2 3 1 Remove the front panel and the outer vanes R L horizontal 2 Remove the pane...

Page 41: ...i Fi interface before installing the panel R 1 Install the panel F 2 Fasten the cable of Wi Fi interface to the part of the panel F with a cable tie 3 Stow the cable of Wi Fi interface in the area 4 Attach the Wi Fi interface so its cable side faces away from you 5 Fasten the cable of Wi Fi interface to the water cover 6 Connect the connector of Wi Fi interface CN110 to the indoor electronic contr...

Page 42: ...electronic control P C board CN1J1 DISPLAY AND i see SENSOR ASSEMBLY CN2T1 Limit switch 9 Remove the DISPLAY AND i see SENSOR ASSEMBLY Photo 7 10 Disconnect the following connector Photo 8 Indoor electronic control P C board CN110 Wi Fi interface 11 Remove the Wi Fi interface refer to 2 12 Remove the screw of the electrical box Photo 7 13 Disconnect the following connectors Photo 8 Indoor power P ...

Page 43: ...nect the earth wire LD104 from the erth plate Removing the indoor electronic control P C board and the indoor power P C board Photo 8 2 Disconnect all the connectors on the indoor electronic control P C board and the indoor power P C board 3 Remove the indoor electronic control P C board and the indoor power P C board Removing the room temperature thermistor Photo 8 2 Disconnect the following conn...

Page 44: ...ard and the interlock switch from the hook Remove the switch buzzer P C board the dis play and receiver P C board and the interlock switch Photo 9 4 Photo 9 Details of the display DISPLAY AND i see SENSOR ASSEMBLY and board in the switch holder 44 Display cover Exploded view of display cover and DISPLAY AND i see SENSOR ASSEMBLY Switch buzzer P C board display and receiver P C board Right side vie...

Page 45: ...lu minum tape on the front of the nozzle assembly Photo 11 Removing outer vane motor R horizontal Photo 12 7 Loosen the lead wires and disconnect the connector of the outer vane motor R horizontal 8 Remove the 2 screws of the outer vane motor R horizontal 9 Remove the outer vane motor R horizontal Removing outer vane motor L horizontal Photo 13 10 Loosen the lead wires and disconnect the connector...

Page 46: ... screws of the vane motor horizontal from the backside of the vane motor unit R horizon tal and remove the vane motor horizontal Removing the vane motor unit R vertical Photo 15 10 Disengage the link of the vane motor unit R vertical 11 Remove the screw indicated in and remove the vane motor unit R vertical Removing the vane motor L horizontal Photo 16 12 Disengage the link of the vane motor unit ...

Page 47: ...s of the fan motor assembly Pull the fan motor assembly slightly toward you and remove it by pulling to the right Photo 20 4 Remove the indoor coil thermistor from the heat exchanger 5 Remove the 2 screws of the hairpin holder on the left side of the heat exchanger Raise the left side of the heat exchanger and pull the line flow fan to the lower left to remove Photo 21 6 Disengage the 2 catches on...

Page 48: ...r 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 When fixing the indoor coil thermistor to the clip shape holder shape part the lead wire should point down About the same length HEAD OFFICE TOKYO BUILDING 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2016 MITSUBISHI ELECTRIC CORPORATION Is...

Page 49: ...AC 567IF B E MELCloud Interface Setup Manual JG79Y243H02 MSZ LN18 60VG Installation Manual JG79B784H15 MSZ LN18 60VG Instruction Book JG79Y371H01 MSZ LN18 60VG Parts Catalogue OBB766A MSZ LN18 60VG Service Manual OBH766B MSZ LN25 60VG Declaration of Conformity CE2017B30 ...

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