SERVICE MANUAL MSZ-A18YV - E1 MSZ-A24YV - MSZ-A24YV - E1 INDOOR UNIT. No. OB345 REVISED EDITION-A. Models. Revision A : SPLIT-TYPE AIR CONDITIONERS

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1 SPLIT-TYPE AIR CONDITIONERS INDOOR UNIT SERVICE MANUAL Models E MSZ-A8YV - E MSZ-AYV - MSZ-A6YV - E Revision A : Parts numbers of indoor fan motor and motor band have been changed. Another type of the electronic control P.C.board (TYPE ) has been added to the original one (TYPE ). They are both compatible with MSZ-A8//6YV- E. Some descriptions have been modified. Please void OB5.. OB5 REVISED EDITION-A CONTENTS MSZ-A8YV - E MSZ-AYV - E MSZ-A6YV - E. PART NAMES AND FUNCTIONS. SPECIFICATION. NOISE CRITERIA CURVES 5. OUTLINES AND DIMENSIONS 6 5. WIRING DIAGRAM 7 6. REFRIGERANT SYSTEM DIAGRAM 8 7. SERVICE FUNCTIONS 9 8. TROUBLESHOOTING 9. DISASSEMBLY INSTRUCTIONS 0 0. PARTS LIST. OPTIONAL PARTS BACK COVER NOTE: This service manual describes technical data of the indoor unit. Refer to the service manual OB6 when MSZ-A8YV - E, MSZ-AYV - E or MSZ-A6YV - is connected with MUZ-A8YV - E, MUZ-AYV - E or MUZ-A6YV - E. Refer to the service manual OB9 when MSZ-A8YV - E, MSZ-AYV - E or MSZ-A6YV - is connected with MXZ-A6WV - E or MXZ-AWV - E as multi system units. E E

2 Use the 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 to follow the instructions. Revision A : Parts numbers of indoor fan motor and motor band have been changed. Another type of the electronic control P.C.board (TYPE ) has been added to the original one (TYPE ). They are both compatible with MSZ-A8//6YV- E. Some descriptions have been modified. PART NAMES AND FUNCTIONS INDOOR UNIT MSZ-A8YV - E MSZ-AYV - E MSZ-A6YV - E Air cleaning filter (option) (White bellows type) Catechin air filter Vertical vanes Horizontal vane Grille Air inlet To Breaker Power supply cord Remote control receiving section Remote controller Operation section (When the grille is opened) Display section Operation indicator lamp Emergency operation switch Remote control receiving section ACCESSORIES Indoor unit Installation plate Installation plate fixing screw o 5 mm Remote controller holder Fixing screw for o.5 o.6 mm (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) MSZ-A8YV - MSZ-AYV - MSZ-A6YV - 7 E E E OB5A

3 REMOTE CONTROLLER MSZ-A8YV - E MSZ-AYV - E MSZ-A6YV - E Signal transmitting section Operation display section PM OPERATE /STOP (ON /OFF)button ON/OFF TOO WARM AM TOO COOL TEMPERATURE buttons Indication of remote controller model is on back. Open the front lid. CLOCK PM AM ON/OFF TOO WARM TOO COOL VANE button (Horizontal vane button) OPERATION SELECT button ECONO COOL button WIDE VANE button (Vertical vane button) I FEEL COOL HEAT DRY MODE ECONO COOL FAN VANE WIDE VANE LONG RESET CLOCK STOP START HR. MIN. FAN SPEED CONTROL button OFF-TIMER button ON-TIMER button HR. button MIN. button (TIME SET button) CLOCK SET button LONG button RESET button OB5A

4 SPECIFICATION Refer to the service manual OB6 when MSZ-A8YV - E, MSZ-AYV - E or MSZ-A6YV - E is connected with MUZ-A8YV - E, MUZ-AYV - E or MUZ-A6YV - E. Refer to the service manual OB9 when MSZ-A8YV - E, MSZ-AYV - E or MSZ-A6YV - E is connected with MXZ-A6WV - E or MXZ-AWV - E as multi system units. Indoor model MSZ-A8YV - E MSZ-AYV - E Function Cooling Heating Cooling Heating Power supply Single phase Single phase 0V, 50Hz 0V, 50Hz Capacity Air flow(high/med. w/low w ) K /h 85/690 w/98w,0/768 w/5w,0/786 w/5w Power outlet Running current Power input Auxiliary heater Power factor Fan motor current A A W A(kW) % A Model RCV-AA RCV0-AA Winding WHT-BLK 9 WHT-BLK 8. " resistance(at 0:) BLK-RED 6 BLK-RED 59.0 Dimensions WOHOD Weight Air direction Sound level(high/med. w/low w) mm kg db,00o5o /8 w/w,00o5o /0 w/w Fan speed(high/med. w /Low w) rpm,0/90 w/70w,0/00 w/750w,0/050 w/750w Fan speed regulator Thermistor RT(at 5:) Thermistor RT(at 5:) Thermistor RT(at 5:) Remote controller model k" k" k" KP0A KP0A Electrical data Fan motor Special remarks Indoor model Function Power supply Capacity Air flow(high/med. w/low w ) K /h,0/798 w/56w,0/86 w/56w Power outlet Running current Power input Auxiliary heater Power factor Fan motor current Model A A W A(kW) % A RCV0-AA Winding WHT-BLK 8. " resistance(at 0:) BLK-RED 59.0 Dimensions WOHOD Weight Air direction Sound level(high/med. w/low w) mm kg db,00o5o /0 w/w Electrical data Fan motor Special remarks Fan speed(high/med. /Low ) Fan speed regulator Thermistor RT(at 5:) Thermistor RT(at 5:) Thermistor RT(at 5:) Cooling Remote controller model NOTE: Test conditions are based on ISO 55. Cooling : Indoor Dry-bulb temperature 7 C Wet-bulb temperature 9 C Outdoor Dry-bulb temperature 5 C Wet-bulb temperature( C) Heating : Indoor Dry-bulb temperature 0 C Wet-bulb temperature 5.5 C Outdoor Dry-bulb temperature 7 C Wet-bulb temperature 6 C Indoor-Outdoor piping length 5m w Reference value Measured under rated operating frequency. OB5A MSZ-A6YV - E Single phase 0V, 50Hz Heating w w rpm w w,0/,060 /800 w w,0/,080 /800 k" k" k" KP0A

5 Specifications and rating conditions of main electric parts INDOOR UNIT Item Model MSZ-A8YV - E MSZ-AYV - E MSZ-A6YV - E Indoor fan capacitor (C) Fuse (F) Vane motor (MV/ MV) Varistor (NR) Solid state relay (SR) Terminal block (TB) Indoor fan motor thermal fuse 5:.5+ 0V 50V.5A MP0/MP0 TNR0V5K0 S0DHN P NOISE CRITERIA CURVES MSZ-A8YV - E MSZ-AYV - E FAN SPEED SPL(dB(A)) LINE MSZ-A6YV - E FAN SPEED SPL(dB(A)) LINE OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR Test conditions, Cooling : Dry-bulb temperature 7: Wet-bulb temperature 9: Heating : Dry-bulb temperature 0: Wet-bulb temperature 5.5: APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE High BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-0 NC-0 NC-0 OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE High Test conditions, Cooling : Dry-bulb temperature 7: Wet-bulb temperature 9: Heating : Dry-bulb temperature 0: Wet-bulb temperature 5.5: BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-0 NC-0 NC-0 INDOORUNIT m WALL 0.8m MICROPHONE OB5A 5

6 OUTLINES AND DIMENSIONS MSZ-A8YV - E MSZ-AYV - E MSZ-A6YV - E INDOOR UNIT Unit: mm Installation plate Indoor unit Air in Power supply cord Lead to right.0m Lead to left.0m Air out 58 Wall hole [75 5 Installation plate Drain hose [6 (Connected part O.D) Insulation [8 { Liquid line [ m Gas line [ -0.m Insulation [ 50 O.D [ I.D for MSZ-A8/AYV { Liquid line [ m Gas line [ -0.m Insulation [ 50 O.D [ I.D for MSZ-A6YV Wireless remote controller OB5A 6

7 5 WIRING DIAGRAM MSZ-A8YV - E INDOOR UNIT TO OUTDOOR UNIT CONNECTING TB V POWER SUPPLY CORD ~/N 0V 50Hz N L BRN BLU RED BLU BRN CN 5 5 MODEL WIRING DIAGRAM CN 0 CN0 TAB CN 0 HIC TRANS F NR CN CN C SR CN CN ELECTRONIC CONTROL P.C. BOARD RT RT BLK GRY YLW BRN WHT RED 5 6 RT MF PE CIRCUIT BREAKER GRN/YLW MV MV MV DISPLAY P.C. BOARD RECEIVER P.C. BOARD REMOTE CONTROLLER SYMBOL C F HIC MF NOTES:.About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring).symbols below indicate. : Terminal block NAME INDOOR FAN CAPACITOR FUSE (.5A) DC/DC CONVERTER INDOOR FAN MOTOR (INNER FUSE) : Connector SYMBOL MV MV NR RT NAME VANE MOTOR (HORIZONTAL) VANE MOTOR (VERTICAL) VARISTOR ROOM TEMPERATURE THERMISTOR SYMBOL RT RT SR TB NAME INDOOR COIL THERMISTOR (MAIN) INDOOR COIL THERMISTOR (SUB) SOLID STATE RELAY TERMINAL BLOCK MSZ-AYV - E MSZ-A6YV - E INDOOR UNIT TO OUTDOOR UNIT CONNECTING TB V POWER SUPPLY CORD ~/N 0V 50Hz N L BRN BLU RED BLU BRN CN 5 MODELS WIRING DIAGRAM 5 CN 0 CN0 TAB CN 0 HIC TRANS F NR C SR CN ELECTRONIC CONTROL P.C. BOARD CN CN RT RT BLK GRY YLW BRN WHT RED CN RT MF PE CIRCUIT BREAKER GRN/YLW MV MV MV DISPLAY P.C. BOARD RECEIVER P.C. BOARD REMOTE CONTROLLER SYMBOL C F HIC MF MV NOTES: NAME SYMBOL NAME SYMBOL NAME INDOOR FAN CAPACITOR FUSE (.5A) DC/DC CONVERTER INDOOR FAN MOTOR (INNER PROTECTOR) VANE MOTOR (HORIZONTAL) MV NR RT RT RT VANE MOTOR(VERTICAL) VARISTOR ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR (MAIN) INDOOR COIL THERMISTOR (SUB).About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring).symbols below indicate. : Terminal block OB5A : Connector 7 SR TB SOLID STATE RELAY TERMINAL BLOCK

8 6 REFRIGERANT SYSTEM DIAGRAM MSZ-A8YV - E MSZ-AYV - E Unit:mm INDOOR UNIT Refrigerant pipe [.7 (with heat insulator) INDOOR UNIT Refrigerant pipe [5.88 (with heat insulator) Indoor heat exchanger Indoor coil RT(main) Distributor Flared connection Indoor heat exchanger Indoor coil RT(main) Distributor Flared connection Indoor coil RT(sub) Room temperature RT Indoor coil RT(sub) Room temperature RT Flared connection Flared connection Refrigerant pipe[6.5 (with heat insulator) Refrigerant pipe [6.5 (with heat insulator) MSZ-A6YV - E INDOOR UNIT Refrigerant pipe [5.88 (with heat insulator) Indoor heat exchanger Indoor coil RT(main) Flared connection Indoor coil RT(sub) Room temperature RT Strainer #50 Flared connection Refrigerant pipe [9.5 (with heat insulator) Refrigerant flow in cooling Refrigerant flow in heating OB5A 8

9 7 SERVICE FUNCTIONS MSZ-A8YV - E MSZ-AYV - E MSZ-A6YV - E 7-. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. The time will be shortened as follows. Set time : minute -second Set time : minute -second (It takes minutes for the compressor to start operation. However, the starting time is shortened by short circuit of JPG and JPS.) 7-. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION A maximum of indoor units with wireless remote controllers can be used in a room. In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be modified according to the number of the indoor unit. How to modify the remote controller P.C. board Remove batteries before modification. The board has a print as shown below : Remote controller model : KP0A J J NOTE : For modification, take out the batteries and press the OPERATE/STOP (ON/OFF) button or times at first. After finish modification, put back the batteries then press the RESET button. The P.C. board has the print J and J. Solder J and J according to the number of indoor unit as shown in Table. After modification, press the RESET button. Table. unit. unit. unit. unit unit operation modification units operation Same as at left Solder J units operation Same as at left Same as at left Solder J units operation Same as at left Same as at left Same as at left Solder both J and J 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 indoor unit will be regarded as the remote controller for the indoor unit. The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are set. The setting will be cancelled if the breaker has turned off, or the power supply has shut down. Please conduct the above setting once again after the power has restored. 7-. 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 electronic control P.C.board. Auto restart function automatically starts operation in the same mode just before the shutoff of the main power. However if the unit is operated in I FEEL CONTROL mode before power failure, the operation is not memorized. In I FEEL CONTROL mode, the operation is decided by the initial room temperature. OB5A 9

10 How to disable AUTO RESTART FUNCTION Turn off the main power for the unit. Pull out the electronic control P.C. board, the receiver P.C. board and the display P.C.board. (Refer to page 0.) Solder jumper wire to the RESISTOR JR07 on the indoor electronic control P.C. board. (Refer to page 8. and 9) Operation If the main power has been cut, the operation settings remain. After the power is restored, the unit restarts automatically according to the memory.(however, it takes at least minutes for the compressor to start running.) NOTE The operation settings are memorized when 0 seconds have passed after the indoor unit was operated with the remote controller. If main power is turned off or a power failure occurs while AUTO START/STOP timer is active,the timer setting is cancelled. If the unit has been off with the remote controller before power failure, the auto restart function does not work as the power button of the remote controller is off. To prevent breaker off due to the rush of starting current, systematize other home appliances not to turn on at the same time. When some air conditioners are connected to the same supply system, if they are operated before power failure, the starting current of all the compressors may flow simultaneously at restart. Therefore, the special counter-measures 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. OB5A 0

11 8 TROUBLESHOOTING MSZ-A8YV - E MSZ-AYV - MSZ-A6YV - E E 8-. Cautions on troubleshooting. Before troubleshooting, check the following: () Check the power supply voltage. () Check the indoor/outdoor connecting wire for mis-wiring.. Take care the following during servicing. () Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug. () Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board. () When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components. () When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. <Incorrect> <Correct> Lead wiring. Troubleshooting procedure () Check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the OPERATION INDICATOR lamp is flashing on and off before starting service work. () Before servicing check that the connector and terminal are connected properly. () If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discolouration. () When troubleshooting, refer to the flow chart on page and the check table on page.. How to replace batteries Weak batteries may cause the remote controller malfunction. In this case, replace the batteries to operate the remote controller normally. Remove the front lid and insert batteries. Then reattach the front lid. Housing point Press the RESET button with a thin instrument, and then use the remote controller. Insert the negative pole of the batteries first. Check if the polarity of the battereis is correct. RESET button NOTE :. If the RESET button is not pressed, the remote controller may not operate correctly.. Do not use the leaking batteries. INFORMATION FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT : MXZ series Multi system air conditioner can connect two or more indoor units with one outdoor unit. Unit won t operate in case the total capacity of indoor units exceeds the capacity of outdoor units. Do not connect indoor units beyond the outdoor unit capacity. When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and the other for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor units will start the operation later cannot operate, indicating as shown in the figure below. In this case, please set all the indoor units to the same operation mode. Operation Indicator Lighted When indoor units starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max. 0 minutes) to blow out the warm air. In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flowing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it. OB5A Blinking

12 8-. Instruction of troubleshooting Start Indoor unit operates. does not operate. Indoor unit operates. does not operate normally. Indoor unit does not receive the signal from remote controller. OPERATION INDICATOR lamp on the indoor unit is flashing on and off. operates in only Test Run operation. does not operate even in Test Run operation. Unit does not operate normal operation in COOL or HEAT mode. Indoor unit operates, when the EMERGENCY OPERATION switch is pressed. Indoor unit does not operate, when the EMERGENCY OPERATION switch is pressed. Check room temperature. Refer to "Test point diagram and voltage" on page 8 and 9. Refer to "Check of inverter/ compressor". Refer to "Check of R.V. coil". Refer to "Check of remote controller and receiver P.C. board".. Check indoor/ outdoor connecting wire. (Check if the power is supplied to the indoor unit.). Refer to "Check of indoor electronic control P.C. board". Flash on and off at 0.5- second interval Cause: Indoor/ Mis-wiring or trouble of serial signal -time flash Cause: Indoor unit Trouble of room temperature/ indoor coil -time flash Cause: Indoor unit Trouble of indoor fan motor -time flash Cause: Indoor unit Trouble of indoor unit control system 5-time flash Cause: Outdoor power system abnormality 6-time flash Cause: Trouble of in outdoor unit 7-time flash Cause: Trouble of outdoor control system Refer to D "How to check miswiring and serial signal error (When outdoor unit does not work)" on page 7. Check room temperature and indoor coil. Refer to "Test point diagram and voltage" on page 8 and 9. Refer to A "Check of indoor fan motor" on page 5. As for outdoor unit MUZ type, refer to service manual OB6. As for outdoor unit MXZ type, refer to service manual OB9. OB5A Replace the indoor electronic control P.C. board. Refer to "Check of inverter/ compressor". Refer to "Check of outdoor s". Replace the outdoor electronic control P.C. board.

13 . Troubleshooting check table The following indication applies regardless of shape of the indicator. Operation Indicator Lighted t lighted Flashing of the OPERATION INDICATOR lamp (the left-hand side lamp) indicates possible abnormalities. The OPERATION INDICATOR lamp (the left-hand side lamp) is lighting during normal operation. Before taking measures, make sure that the symptom reappears, for accurate troubleshooting. Self check table. Abnormal point Mis-Wiring or Serial signal Indoor coil Room temperature 0.5-second ON 0.5-second OFF -time flash Operation indicator lamp Symptom Detection method Checkpoint.5-second OFF does not operate. does not operate. minutes after power supply turns ON, when serial signal is not received. Detect Indoor coil/room temperature short or open circuit every 8 seconds during operation. Refer to D "How to check mis-wiring and serial signal error" on page 7. Refer to the characteristics of main indoor coil, sub indoor coil, and room temperature on page 8 and 9. Indoor fan motor -time flash.5-second OFF Indoor fan repeats seconds ON and minutes OFF. When the indoor fan breaks, the fan keeps stopping. When rotational frequency feedback signal is not emit during -second indoor fan operation. Refer to A "Check of indoor fan motor" on page 5. Indoor control system -time flash.5-second OFF does not operate. When it cannot properly read data in the nonvolatile memory of the indoor electronic control P.C. board. Check the indoor electronic control P.C. board. 5 Outdoor power system 5-time flash.5-second OFF does not operate. When compressor has stopped due to over current protection or start-up failure protection times in a row within 5 seconds after startup. Refer to "Check of inverter/ compressor". Refer to service manual OB6 or OB9. 6 Outdoor s 6-time flash.5-second OFF does not operate. <Thermistor short> Thermistors are abnormal when they short after compressor start-up. <Thermistor open> Thermistors are abnormal when they open after compressor start-up. However, discharge temperature is abnormal when open circuit is detected more than 0 minutes after compressor start-up. Shortage of refrigerant Replace the outdoor control P.C. board. Refer to "Check of outdoor ". Refer to service manual OB6 or OB9. 7 Outdoor control system 7-time flash.5-second OFF does not operate. When it cannot properly read data in the nonvolatile memory of outdoor electronic control P.C. board. Replace the outdoor electronic control P.C. board. Refer to service manual OB6 or OB9. 8 MXZ type Operation mode setting Operation Indicator Lighted Blinking Right lamp flashes..5-second OFF operates but indoor unit does not operate. When the operation mode of each indoor unit is differently set to COOL(includes DRY) and HEAT at same time, the operation mode of indoor unit that has operated at first has the priority. Unify the operation mode. Refer to service manual OB9. NOTE : When the indoor unit has started operation and the above detection method has detected an abnormality (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with the OPERATION INDICATOR lamp flashing. OB5A

14 . Trouble criterion of main parts MSZ-A8YV - E MSZ-AYV - E MSZ-A6YV - E Part name Room temperature (RT) Indoor coil (RT(main), RT(sub)) Indoor fan motor(mf) MSZ-A8YV INNER FUSE 5: CUT OFF MSZ-A/A6YV INNER PROTECTOR 5i 5: OPEN 86i 5: CLOSE Check method and criterion Measure the resistance with a tester. (Part temperature 0 C ~ 0 C) Motor part Sensor part rmal 8 k" ~ 0 k" Color of lead wire WHT BLK BLK RED Abnormal Open or short-circuit Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 0 C) MSZ-A8YV 8 " ~ 05 " " ~ 5 " Measure the voltage power ON. Color of lead wire BRN YLW YLW GRY rmal MSZ-A/A6YV " ~ " 5 " ~ 66 " rmal.5 ~ 5.5V (When fan revolved one time) 0V 5V 0V (Approx.) Abnormal Open or short-circuit Abnormal Remain 0V or 5V Figure MSZ-A8YV FUSE BLK BLK MAIN AUX BRN YLW GRY BRN YLW GRY RED RED WHT MSZ-A/A6YV P MAIN AUX. WHT Horizontal vane motor(mv) Vertical vane motor(mv) Measure the resistance between the terminal with a tester. (Part temperature 0 C ~ 0 C) rmal 8 " ~ 06 " Abnormal Open or short-circuit RED YLW BRN ROTOR ORN GRN P :INNER PROTECTOR OB5A

15 When OPERATION INDICATOR lamp flashes -time. Indoor fan motor does not operate. A Check of indoor fan motor Turn OFF the power supply. Check connector CN visually. Are lead wires connected? Is soldered point of the connector correctly soldered? Resolder it. Reconnect the lead wires. Disconnect lead wires from connector CN on the indoor electronic control P.C. board. Measure resistance between lead wires. and. and then. and.. w Pay enough attention to the high voltage on the fan motor connector. Is resistance 0 (short circuit) or (open circuit)? ( 0 or ) Repair or replace the indoor fan motor. (others) Turn ON the power supply. Stop it if the unit operate. Insert screwdriver into air outlet to rotate indoor fan motor slowly for revolution or over, and measure voltage between.(+) and.(-) on CN. Does voltage repeat 0 VDC and 5 VDC? Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote controller. B Check of remote controller and receiver P.C. board w Check if the remote controller is exclusive for this air conditioner. Switch on the remote controller. Replace the indoor electronic control P.C. board. Is LCD display on the the remote controller visible? (not clear) Replace the batteries.(refer to page.) Remove the batteries, then set them back and press the RESET button. Check if the unit operates with the remote controller. Does the unit operate with the remote controller? Turn on a radio to AM and press switch on the remote controller. OK Is noise heard from radio? Replace the remote controller. Are there any fluorescent lights of inverter or rapid-start type within the range of m? Reinstall the unit away from lights. Attach a filter on receiving part. Measure the voltage between receiver P.C. board connector CN0.(+) and.(-) when the remote controller button is pressed. Is the voltage approximately VDC? (5V or 0 VDC) Replace the indoor electronic control P.C. board. OB5A Replace the receiver P.C. board. 5

16 The unit does not operate with the remote controller. Also, the OPERATION INDICATOR lamp does not light up by pressing the EMERGENCY OPERATION switch. C Check of indoor electronic control P.C. board Check the both parts side and pattern side of indoor electronic control P.C. board visually. Varistor (NR) Turn OFF the power supply. Remove indoor fan motor connector CN and vane motor connector CN5 from the indoor electronic control P.C. board and turn ON the power supply. Fuse (F) Does the unit operate with the remote controller? Does the OPERATION INDICATOR lamp light up by pressing the EMERGENCY OPERATION switch? Indoor electronic control P.C. board Turn OFF the power supply. Replace the vane motor. Turn OFF the power supply. Is winding resistance of vane motor 0 "? Replace the fuse. Is winding resistance of fan motor 0 "? Replace the fan motor. Is fuse(f) blown? Is varistor(nr) burnt? Replace the indoor electronic control P.C. board. Replace the varistor. OB5A 6

17 When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. does not operate. D How to check mis-wiring and serial signal error (when outdoor unit does not work) Start Turn ON the power supply (Indoor/ outdoor unit). Press once EMERGENCY OPERATION switch. After minutes, mis-wiring is indicated (0.5-second ON, 0.5-second OFF) on OPERATION INDICATOR lamp on the indoor unit.w w Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self-check to be displayed in seconds. Correct them. Is there any mis-wiring, poor contact, or wire disconnection? w A CLOCK The following indication applies regardless of shape of the indicator. Blinking Operation Indicator C AMPM AMPM B Turn OFF the power supply (Indoor/ outdoor unit). Disconnect the indoor/ outdoor connecting wire. Short-circuit indoor terminal block N and. Turn ON the power supply (Indoor/ outdoor unit). During pressing the OPERATION SELECT button on the remote controller, press the RESET button. At first, release the RESET button. And release the OPERATION SELECT button since all LCD in operation display section of the remote controller is displayed after seconds. Transmit the signal of remote controller, pressing OPERATE/STOP (ON/OFF) button on the remote controller. (The above procedure allows OPERATION INDICATOR lamp to indicate the failure-mode.) Does the right side of OPERATION INDICATOR lamp blink quickly? w Mis-wiring may damage indoor electronic control P.C. board during the operation. Be sure to confirm the wiring is correct before the operation starts. (light up or OFF) Replace the indoor electronic control P.C. board. Release the failure mode. w Reconnect the power supply cable. Check of power supply. OB5A Remove the short-circuit between indoor terminal block N and. Reconnect the indoor/ outdoor connecting wire. Turn ON the power supply (Indoor/ outdoor unit). Press the EMERGENCY OPERATION switch. Is there amplitude of 5 to 0V DC between outdoor terminal block N and after minutes (for confirmation of serial signal)? Is there 0V AC between outdoor terminal block L and N? Is there 5V DC between CN80 and on the outdoor electronic control P.C. board? Replace the outdoor electronic control P.C. board. As for outdoor unit MUZ type, refer to service manual OB6. As for outdoor unit MXZ type, refer to service manual OB9. 7 Replace the indoor/ outdoor connecting wire. w Be sure to release the failure-mode recall function after checking. Procedure of release of failure-mode. Press the EMERGENCY OPERATION switch. Turn OFF the power supply (Indoor/ outdoor unit). Press the RESET button on the remote controller. A Turn OFF inverter-controlled lighting equipment. Turn OFF the power supply and then turn ON again (Indoor/ outdoor unit). Press the EMERGENCY OPERATION switch. After minutes, is mis-wiring indicated on OPERATION INDICATOR lamp on the indoor unit? B Reinstall either the unit or the light each other away. Attach a filter on receiving section of the indoor unit.

18 TEST POINT DIAGRAM AND VOLTAGE MSZ-A8YV - E MSZ-AYV - E MSZ-A6YV - Indoor electronic control P.C. board TYPE E w There are types of electronic control P.C. boards (TYPE/TYPE). They are both compatible with MSZ-A8//6YV. Fan motor power supply (CN) } Power supply input 0 VAC + } 5 VDC Fuse (F) 50 VAC.5A R Room temperature (RT) Indoor coil (RT(main)) CN Indoor coil (RT(sub)) Vane motor power supply (CN5) Emergency operation switch Timer short mode point (JPS, JPG) (Refer to 7-.) Receiver P.C. board + } VDC Indoor coil (RT(main), RT(sub)) Room temperature (RT) To disable Auto restart function, solder jumper wire to JR07. (Refer to 7-.) Resistance(k") OB5A 8

19 TEST POINT DIAGRAM AND VOLTAGE MSZ-A8YV - E MSZ-AYV - E MSZ-A6YV - Indoor electronic control P.C. board TYPE E Fan motor power supply (CN) } Power supply input 0 VAC Fuse (F) 50 VAC.5A + } 5 VDC VDC R { + Room temperature (RT) Indoor coil (RT (main)) Indoor coil (RT (sub)) CN To disable Auto restart function, solder jumper wire to JR07. (Refer to 7-.) Vane motor power supply (CN5) Emergency operation switch Timer short mode point (JPS, JPG) (Refer to 7-.) Receiver P.C. board Indoor coil (RT (main), RT (sub)) Room temperature (RT) CN0 Resistance (k ) OB5A 9

20 9 DISASSEMBLY INSTRUCTIONS <"Terminal with lock mechanism" Detaching points> In case of terminal with lock mechanism, detach the terminal as shown below. There are two types ( Refer to () and ()) of the terminal with lock mechanism. The terminal with no lock mechanism can be removed by pulling it out. Check the shape of the terminal and work. () Slide the sleeve and check if there is a locking lever or not. () The terminal with this connector is a terminal with lock mechanism Sleeve Locking lever Slide the sleeve. Pull the terminal while pushing the locking lever. Connector Hold the sleeve, and pull out the terminal slowly. 9-. MSZ-A8YV - E MSZ-AYV - E MSZ-A6YV - OPERATING PROCEDURE. Removing the front panel () Remove the screw caps of the front panel. Remove the screws. () Pull the panel down to your side slightly and unhook the catches at the top. E NOTE: Turn OFF power supply before disassembly. Photo PHOTOS Front panel Screws. Removing the electronic control P.C. board, the receiver P.C. board and the display P.C. board () Remove the front panel. (Refer to.) () Remove the screw of the electrical cover. Remove the electrical cover. () Remove the screws of the V.A. clamp. Remove the V.A. clamp. () Remove the screw of the terminal block. (5) Remove the screws of the earth wire. (6) Disconnect all the connectors and all the lead wires on the electronic control P.C. board. (7) Remove the R.L holder. (8) Remove the electronic control P.C. board. (9) Open the R.L holder, remove the receiver P.C. board and the display P.C. board. Photo Screws of the earth wire R.L Screw of holder the terminal block Receiver P.C. board Fan motor connectors Vane motor connector Indoor electronic control P.C. board Screw of the electrical cover Screw of the V.A. clamp OB5A 0

21 OPERATING PROCEDURE PHOTOS. Removing the electrical box () Remove the front panel. (Refer to.) () Remove the electrical cover. (Refer to.) () Disconnect the connector of the indoor coil. () Disconnect the motor connector (CN and CN) and the vane motor connector (CN5) on the electronic control P.C. board. (5) Remove the screws of earth wire. (6) Remove the fan motor lead wire and indoor coil from the electrical box. (7) Remove the lead wire of vane motor from the bottom of electrical box. (8) Remove the screw fixing the electrical box and remove the electrical box. Photo Screws of the earth wire Screw of the electrical cover Screw of the electrical box. Removing the vane motor () Remove the front panel. (Refer to.) () Remove the electrical cover. (Refer to.) () Remove the lead wire of vane motor.(refer to.) () Remove the R.L. holder. (5) Pull out the drain hose from the nozzle assembly and remove the nozzle assembly. (6) Remove the screws of the vane motor and disconnect the connector. (7) Remove the vane motor. Photo 5 Screws of the vane motor Photo Vane motors Screws of the vane motor Vane motor 5. Removing the line flow fan and the indoor fan motor () Remove the front panel. (Refer to.) () Remove the electrical box. (Refer to.) () Pull out the drain hose from the nozzle assembly and remove the nozzle assembly. () Remove the water cut. (5) Slide the hole cover and remove the hole cover. (6) Remove the hexagon socket set screw from the line flow fan. (7) Remove the screws fixing the fan motor and remove the fan motor. (Be careful not to drop the fan motor because it is heavy.) (8) Remove the screws fixing the left side of the heat exchanger. (9) Lift the left side of the heat exchanger. (0) Remove the line flow fan. Photo 8 Hole cover Photo 6 Screws fixing the left side of the heat exchanger Photo 7 Indoor coil Water cut OB5A Screws fixing the fan motor

22 0 PARTS LIST (non-rohs compliant) MSZ-A8YV - E (WH) MSZ-AYV - E (WH) MSZ-A6YV - E (WH) 0-. INDOOR UNIT STRUCTURAL PARTS 0-. INDOOR UNIT HEAT EXCHANGER CATCH 5 SCREW CAP 6 8 Optional parts (See.) INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration Part. E E0 57 E E0 08 E E E E E Part Name INSTALLATION PLATE BOX (WH) FRONT PANEL ASSEMBLY(WH) CATCH SCREW CAP (WH) GRILLE (WH) CATECHIN AIR FILTER CORNER BOX RIGHT LAMP PANEL Symbol in Wiring Diagram MSZ-A8 YV - E (WH) Q'ty/unit MSZ-A YV - E (WH) MSZ-A6 YV - E (WH) Remarks Including.,5,6 PCS/ SET PCS/ SET 0-. INDOOR UNIT HEAT EXCHANGER 0 E E E E E E INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION (GAS) UNION (GAS) UNION (LIQUID) UNION (LIQUID) {.7 {5.88 {6.5 {9.5 OB5A

23 PARTS LIST (non-rohs compliant) MSZ-A8YV - E (WH) MSZ-AYV - E (WH) MSZ-A6YV - E (WH) 0-. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS SLEEVE BEARING ROOM TEMPERATURE THERMISTOR 0-. ACCESSORY AND REMOTE CONTROLLER Part. E E E E E E E E0 7 8 E E E E F57 00 E0 8 0 E E F57 E0 57 E E E E E E E E E E E FUSE w Refer to page 8 and VARISTOR INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. Part Name LINE FLOW FAN BEARING MOUNT SLEEVE BEARING DRAIN HOSE NOZZLE ASSEMBLY (WH) VANE UPPER (WH) VANE LOWER (WH) FUSE VARISTOR VANE CRANK SET INDOOR FAN MOTOR ASSEMBLY INDOOR FAN MOTOR ASSEMBLY VANE MOTOR (VERTICAL) VANE MOTOR (HORIZONTAL) MOTOR BAND SET MOTOR BAND DISPLAY P.C. BOARD RECEIVER P.C. BOARD ELECTRONIC CONTROL P.C. BOARD w ELECTRONIC CONTROL P.C. BOARD w ELECTRONIC CONTROL P.C. BOARD w ROOM TEMPERATURE THERMISTOR TERMINAL BLOCK INDOOR COIL THERMISTOR INDOOR COIL THERMISTOR VANE MOTOR SUPPORT SET(RIGHT) VANE MOTOR SUPPORT SET(LEFT) Symbol in Wiring Diagram F NR MF MF MV MV RT TB RT, RT RT, RT 0-. ACCESSORY AND REMOTE CONTROLLER 5 E E OB5A REMOTE CONTROLLER REMOTE CONTROLLER HOLDER 8 MSZ-A8 YV - E (WH) Q'ty/unit MSZ-A YV - E (WH) MSZ-A6 YV - E (WH).5A RCV0 - Remarks Including RUBBER MOUNT RCV0 - Including RUBBER MOUNT, MOTOR BAND and MOTOR BED RIGHT & LEFT UP & DOWN Including two kinds of motor bands AUTO RESTART Including.7 AUTO RESTART Including.7 AUTO RESTART Including.7 KP0A

24 OPTIONAL PARTS AIR CLEANING FILTER AIR CLEANING FILTER removes fine dust of 0.0 micron from air by means of static electricity. rmal life of AIR CLEANING FILTER is months. However, when it becomes dirty, replace it as soon as possible. Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. DO NOT reuse AIR CLEANING FILTER even if it is washed. DO NOT remove or attach AIR CLEANING FILTER during unit operation. Model MSZ-A8YV - E MSZ-AYV - E MSZ-A6YV - E Part. MAC-700FT Air cleanig filter (White bellows type) HEAD OFFICE: MITSUBISHI BLDG.,-7-, MARUNOUCHI, CHIYODA-KU, TOKYO00-80, JAPAN C Copyright 00 MITSUBISHI ELECTRIC CORPORATION Distributed in Mar. 0..OB5 REVISED EDITION-A Distributed in Apr. 00..OB5 6 Made in Japan New publication, effective Mar. 0 Specifications are subject to change without notice.