MSZ-A09-12YV MITSUBISHI | Alldatasheet

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1 PART NAMES AND FUNCTIONS

Installation plate fixing screw 4 o 25 mm Remote controller holder Fixing screw for 3 3.5 o 1.6 mm (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) MSZ-A09YV - MSZ-A12YV - E1 INDOOR UNIT INDOOR UNIT MSZ-A09YV - MSZ-A12YV - E1 Emergency operation switch Line flow fan Catechin air filter (With deodorizer) Air outlet Vertical vanes Air inlet to Breaker Remote control receiving section Display section Air cleaning filter (white bellows type) Front panel Power supply cord Panel Heat exchanger Horizontal vane Operation section (When the front panel is opened) Remote controller Operation indicator lamp Remote control receiving section OB327 --1qxp 04.1.8 1:41 PM Page 2

HR. MIN. AMPM CLOCK AM RESET CLOCK I FEEL COOLDRY AUTOHEAT Open the front lid. Signal transmitting section Operation display section OPERATE /STOP (ON /OFF) button TEMPERATURE buttons OPERATION SELECT button FAN SPEED CONTROL button OFF-TIMER button HR. button MIN. button (TIME SET button) ON-TIMER button RESET button ECONO COOL button VANE CONTROL button CLOCK SET button Indication of remote controller model MSZ-A09YV - MSZ-A12YV -E1 OB327 --1qxp 04.1.8 1:41 PM Page 3

1.5+ 440V 250V 3.15A 93:5A 250V MSBPC20 12V 250 " ERZV10D471 S201DH1Y JM1aN-ZTMP-DC12V 136:i3: 2A INDOOR UNIT Item Model Indoor fan capacitor Fuse Thermal fuse Vane motor Varistor Solid state relay Terminal block Contactor Indoor fan motor thermal fuse MSZ-A09YV - E1 MSZ-A12YV - E1 (C11) (F11) (F12) (MV) (NR11) (SR141) (TB) (52C) Specifications and rating conditions of main electric parts

2 SPECIFICATION

MSZ-A09YV - E1 MSZ-A12YV - E1 Indoor model Function Power supply Single phase 230V,50Hz 0.17 0.17 RC4V19-LA WHT-BLK 413 BLK-RED 334 815O278O244 KG04A Cooling W/222W 37/29W/21W 1,010/770W/540W Heating 564/402W/246W 38/30W/21W 1,110/840W/580W Single phase 230V,50Hz 0.19 0.19 RC4V19-KA WHT-BLK 316 BLK-RED 299 815O278O244 KG04A Cooling W/288W 39/31W/22W 1,030/800W/570W Heating 642/474W/312W 38/30W/22W 1,050/820W/600W Air flow(High/Med.W/LowW) Power outlet Running current ]1 Power input Rated frequency Auxiliary heater Power factor ]1 Fan motor current ]1 Model Winding resistance(at20:) Dimensions WOH OD Weight Air direction Sound level(High/Med.W/LowW) Fan speed(High/Med.W/LowW) Fan speed regulator Thermistor RT11(at25:) Thermistor RT12(at25:) Thermistor RT13(at25:) Remote controller model K /h A A W A(kW) A mm kg dB(A) rpm Electrical data Fan motor Special remarks Capacity NOTE : Test conditions are based on ISO 5151 Cooling : Indoor DB27: WB19 : Outdoor DB35: WB 24 : Heating : Indoor DB 20: WB15 : Outdoor DB 7: WB 6 : Refrigerant piping length (one way): 5m w Reference value ]1 Measured under rated operating frequency. OB327 --1qxp 04.1.8 1:41 PM Page 4

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 Test conditions, Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE COOLING FUNCTION SPL(dB(A)) LINE High FAN SPEED HEATING Heating : Dry-bulb temperature 20: Wet-bulb temperature 15: MSZ-A09YV -E1 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 APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE COOLING FUNCTION SPL(dB(A)) LINE High FAN SPEED HEATING Test conditions, Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19: Heating : Dry-bulb temperature 20: Wet-bulb temperature 15: INDOORUNIT WALL MICROPHONE 0.8m MSZ-A12YV -E1 OB327 --1qxp 04.1.8 1:41 PM Page 5

4 OUTLINES AND DIMENSIONS

MSZ-A09YV - E1 Unit : mm INDOOR UNIT 244 242 5 7 or more 110 149606 278 815 783 Power supply cord Lead to right 1.0m Lead to left 0.3m Air out Installation plate Insulation [28 Drain hose [16 (Connected part O,D) Air in Liquid line [6.35-0.5m Gas line [9.52-0.43m Insulation [37 O.D [21 I.D Wireless remote controller 162 1958 81.581.5 2.5 271 231.5 4.5 81.5 133.5 326326 Wall hole [65 Indoor unit Installation plate MSZ-A12YV - E1 Unit : mm INDOOR UNIT 244 242 218.5 258 81.581.5 2.5 17.5 161.5161.5 326326 162 1958 7 or more 110 149606 278 815 783 Power supply cord Lead to right 1.0m Lead to left 0.3m Air out Indoor unit Installation plate Wall hole [65 Installation plate Insulation [28 Drain hose [16 (Connected part O,D) Wireless remote controller Liquid line [6.35-0.5m Gas line [9.52-0.43m Insulation [37 O.D [21 I.D Air in OB327 --1qxp 04.1.8 1:41 PM Page 6

REFRIGERANT SYSTEM DIAGRAM6 MSZ-A09YV -E1 Indoor heat exchanger Flared connection Room temperature thermistor RT11 Indoor coil thermistor RT13(sub) Flared connection Refrigerant flow in cooling Refrigerant flow in heating Refrigerant pipe [9.52 (with heat insulator) Refrigerant pipe [6.35 (with heat insulator) Indoor coil thermistor RT12(main) Indoor heat exchanger Flared connection Room temperature thermistor RT11 Indoor coil thermistor RT13(sub) Flared connection Refrigerant pipe [9.52 (with heat insulator) Refrigerant pipe [6.35 (with heat insulator) Indoor coil thermistor RT12(main) INDOOR UNIT Unit:mm INDOOR UNIT MODELS WIRING DIAGRAM SYMBOL C11 F11 F12 MF MV SYMBOL NR11 RT11 RT12 RT13 SR141 SYMBOL SR142 T11 TB 52C NAME INDOOR FAN CAPACITOR FUSE (3.15A) THERMAL FUSE (93 :) INDOOR FAN MOTOR (INNER FUSE) VANE MOTOR NAME VARISTOR ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR (MAIN) INDOOR COIL THERMISTOR (SUB) SOLID STATE RELAY NAME SOLID STATE RELAY TRANSFORMER TERMINAL BLOCK CONTACTOR GRN/YLW BLK GRY YLW BRN WHT RED MF SR141 SR142 1C11 RT13 RT12 CN 112 CN 111 CN 121 151 CN 109 CN 125 CN 1R1 CN MV RT11 CN211 NR11 ELECTRONIC CONTROL P.C. BOARD F11 T11 230V~ BRNTBL N RED WHT BLU F12 BLU BLU 1

2 BLU 1

L N 12V TO OUTDOOR FOR MXZ type UNIT CONNECTING REMOTE CONTROLLER POWER MONITOR RECEIVERSAFETY DEVICE (FAN) P.C. BOARD LD103 GRN CIRCUIT BREAKER POWER SUPPLY CORD ~/N 230V 50Hz PE NOTE:1. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing. 2. Use copper conductors only. (For field wiring) 3. Symbols below indicate. /: Terminal block, : Connector MSZ-A09YV - MSZ-A12YV -E1 MSZ-A12YV -E1 INDOOR UNIT OB327 --1qxp 04.1.8 1:41 PM Page 7

7 SERVICE FUNCTIONS

7-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION A maximum of 4 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. 7-1. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board. The time will be shortened as follows. (Refer to page 18.) Set time : 1-minute Ô 1-second Set time : 3-minute Ô 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuit of JPG and JPS.) MSZ-A09YV - MSZ-A12YV -E1 No. 1 unit No. 2 unit No. 3 unit No. 4 unit 1 unit operation No modification 2 units operation Same as at left Solder J1 3 units operation Same as at left Same as at left Solder J2 4 units operation Same as at left Same as at left Same as at left Solder both J1 and J2 Table 1 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 accepts 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. How to modify the remote controller P.C. board Remove batteries before modification. The board has a print as shown below : The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table After modification, press the RESET button. NOTE : For remodelling, take out the batteries and press the OPERATE/STOP(ON/OFF) button twice or 3 times at first. After finish remodelling, put back the batteries then press the RESET button. Remote controller model : KG04A J2 7-3. 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. The “AUTO RESTART FUNCTION” sets to work the moment power has restored after power failure. Then, the unit will restart automatically. 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. OB327 --1qxp 04.1.8 1:41 PM Page 8

NOTE:

  • The operation settings are memorized when 10 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 can- celled.
  • If the unit has been off with the remote controller before power failure, the auto restart function does not works as the power button of the remote controller is off.
  • To prevent breaker off due to the rush of starting current, systematize other home appliance 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. Operation 1 If the main power (230V AC) has been cut, the operation settings remain. 2 After the power is restored, the unit restarts automatically according to the memory. (However, it takes at least 3 min- utes for the compressor to start running.) How to release “AUTO RESTART FUNCTION” 1Turn off the main power for the unit. 3Solder the Jumper wire to the JR07 on the indoor electronic control P.C.board. (Refer to page 18.) JR07 IC101 CN151SW1 CN112 CN111 CN20152C C11 CN211CN1V1 CN1R1CN121 OB327 --1qxp 04.1.8 1:41 PM Page 9

8 TROUBLESHOOTING

  1. Troubleshooting procedure 1) First, 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 abnormality indication is flashing on and off before starting service work. 2) Before servicing check that the connector and terminal are connected properly. 3) 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 discoloration. 4) When troubleshooting, refer to the flow chart on page 12 and the check table on page 13. 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. RESET button 8-1. Cautions on troubleshooting 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 2. Take care the following during servicing. 1) 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. 2) 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. 3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components. 4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. Housing pointLead wiring Insert the negative pole of the batteries first. Check if the polarity of the batteries are correct. NOTE : 1. If the RESET button is not pressed, the remote controller may not operate correctly. 2. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced. This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the battery replacement.

2 Press the RESET button with tip end of ball point

pen or the like, and then use the remote controller. 1 Remove the front lid and insert batteries. Then reattach the front lid. MSZ-A09YV - MSZ-A12YV -E1 OB327 --1qxp 04.1.8 1:41 PM Page 10

  1. How to install the horizontal vanes Upper vane Lower vane In procedures 2,3,5, and 6, lock the stoppers until they click into place. 654 321 If horizontal vanes are not installed correctly, both of the operation indicator lamps will flash. In this case, install the horizontal vanes correctly by following the procedures 1 to 6. NOTE: Before installation of the horizontal vanes, disconnect the power supply plug and/ or turn off the breaker. The holes on the insertion ends of the upper and lower horizontal vanes different shapes. Insert this end first. Upper right Lower right Insert this end first. Stopper Lock. Stopper Lock. Lock. Lock. In. Insert. Insert. In. 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. Operation indicator lamp flashes as shown in the figure below.
  • 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.
  • When indoor units starts the operation while the defrosting of outdoor unit is being done, it takes a few min- utes (max. 10 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. Lighted Flashing Operation Indicator OB327 --1qxp 04.1.8 1:41 PM Page 11

operates. Outdoor unit doesn't operate. Indoor unit doesn't receive the signal from remote controller. OPERATION INDICATOR lamp on the indoor unit is flashing on and off. Outdoor unit operates in only Test Run operation. Outdoor unit doesn't operate even in Test Run operation. Indoor unit operates, when the EMERGENCY OPERATION switch is pressed. Indoor unit doesn't operate, when the EMERGENCY OPERATION switch is pressed. Check room temperature thermistor. Refer to "Test point diagram and voltage" on page 18. Refer to "Check of inverter/ compressor". Refer to B "Check of remote controller and receiver P.C. board" on page 15. 1. Check indoor / outdoor connecting wire. (Check if the power is supplied to the indoor unit.) 2. Refer to C "Check of indoor electronic control P.C. board" on page 15. Unit doesn't operate normal operation in COOL or HEAT mode. Refer to "Check of R.V. coil". Left lamp Flash on and off at 0.5-second intervals Cause: Indoor/ Outdoor unit

  • Mis-wiring Left lamp 2-time flash Cause: Indoor unit
  • Trouble of room temp- erature/ indoor coil thermistor Left lamp 3-time flash Cause: Indoor unit
  • Trouble of indoor fan motor Left lamp 5-time flash Cause: Outdoor unit
  • Outdoor power system abnormality Left lamp 6-time flash Cause: Outdoor unit
  • Trouble of thermistor in outdoor unit Left lamp 7-time flash Cause: Outdoor unit
  • Trouble of outdoor control system Refer to D "How to check of mis-wiring (When outdoor unit doesn't work)" on page 16. Both lamps (Left and right) Flash on and off at 0.5-second intervals Cause: Indoor unit
  • The horizontal vanes are not installed correctly. Refer to E "Check of installation of the horizontal vanes" on page 17. Check room temperature thermistor and indoor coil thermis- tor. Refer to "Test point diagram and voltage" on page 18. Refer to A "Check of indoor fan motor" on page 14. Refer to "Check of inverter/ compressor". Refer to "Check of outdoor thermistor". Replace the inverter P.C. board and others. Left lamp 4-time flash Cause: Indoor unit
  • Trouble of indoor unit control system Replace the indoor electronic control P.C. board. As for outdoor unit, refer to service manual OB328 or OB319. 8-2. Instruction of troubleshooting OB327 --1qxp 04.1.8 1:41 PM Page 12

No. SymptomOperation indicator lamp Detection method Check point Left lamp flashes. 0.5-second ON 0.5-second OFF Mis-Wiring Outdoor power systemOutdoor thermistorsOutdoor control system Indoor coil thermistor 3 minutes after power supply turns ON, when serial signal is not received. When compressor has stopped due to over current protection or start-up failure protection 3 times in a row within 5 seconds after start- up. <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 thermistor is abnormal when open circuit is detected more than 10 minutes after compressor start-up. When it cannot properly read data in the nonvolatile memory of outdoor electronic control P.C. board.

  • Shortage of refrigerant
  • Replace the outdoor control P.C. board. Refer to "Check of outdoor thermistor". Refer to service manual OB328 or OB319.
  • Refer to "Check of inverter/ compressor". Refer to service manual OB328 or OB319.
  • Replace the outdoor electronic control P.C. board or inverter P.C. bpard. Refer to service manual OB328 or OB319.
  • Refer to D "How to check mis-wiring " on page 16. w3 Indoor fan motor Abnormal point Outdoor unit does not operate. Room tempera- ture thermistor Left lamp flashes. 2-time flash 2.5-second OFF Detect Indoor coil/room temperature thermistor short or open circuit every 8 seconds during operation.
  • Refer to the characteristics of indoor coil thermistor, sub indoor coil thermistor, and room temperature thermistor on page 18. Left lamp flashes. 3-time flash 2.5-second OFF Indoor fan repeats 12 seconds ON and 3 minutes OFF. When the indoor fan breaks, the fan keeps stopping. When rotational frequency feedback signal is not emit during 12-second indoor fan operation.
  • Refer to A "Check of indoor fan motor" on page 14. Left lamp flashes. 4-time flash 2.5-second OFF Indoor control system When it cannot properly read data in the nonvolatile memory of indoor electronic control P.C. board. Outdoor unit does not operate. Outdoor unit does not operate.
  • Replace the indoor electronic control P.C. board. Left lamp flashes. 5-time flash 2.5-second OFF Left lamp flashes. 6-time flash 2.5-second OFF Outdoor unit does not operate.Outdoor unit does not operate. Outdoor unit does not operate. 0.5-second ON 0.5-second OFF When the electricity is not conducted to the safety device (FAN) of the horizontal vane.
  • Refer to E "Check of installation of the horizontal vanes" on page 17. Indoor unit and outdoor unit do not operate. Attachment of the horizontal vane Both lamps flash at the same time. Operation Indicator Both lamp MXZ type Operation mode setting Lighted Flashing Outdoor unit 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 OB319. Left lamp flashes. 7-time flash 2.5-second OFF2.5-second OFF NOTE : w 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 52C and the indoor fan motor with the OPERATION INDICATOR lamp lighting. When the 52C and the indoor fan motor are turned ON again 3 minutes later and the same abnormality is detected (a second detection of the above abnormality after the power ON), the indoor electronic control P.C. board turns OFF the 52C and the indoor fan motor with the OPERATION INDICATOR lamp flashing. However, the first detection is cleared in case the power is turned OFF after the first detection. 1. Troubleshooting check table NOTE : Before taking measures, make sure that the symptom reappears for accurate troubleshooting. Self check table Operation Indicator· Flashing of the OPERATION INDICATOR lamp (on the left or both) indicates possible abnormalities.
  • The OPERATION INDICATOR lamp (on the left) is lighting during normal operation. flashing
  • The following indication applies regardless of shape of the indicator. OB327 --1qxp 04.1.8 1:41 PM Page 13
  1. Trouble criterion of main parts MSZ-A09YV - MSZ-A12YV - E1E1 Part name FigureCheck method and criterion Indoor fan motor(MF) INNER FUSE 136i 3: CUT OFF WHT – BLK BLK – RED Abnormal Open or short-circuit Normal MSZ-A09YV 303 " ~ 329 " 287 " ~ 311 " MSZ-A12YV 396 " ~ 430 " 320 " ~ 348 " Measure the resistance with a tester. (Part temperature 10˚C ~ 30˚C) Normal 8 k" ~ 20 k" Abnormal Open or short-circuit Room temperature thermistor(RT11) Indoor coil thermistor (RT12(MAIN), RT13(SUB)) Vane motor(MV) Motor partSensor part Measure the resistance between the terminals with a tester. (Part temperature 10˚C ~ 30˚C) BRN – YLW YLW – GRY Abnormal Remain 0V or 5V Normal 4.5 ~ 5.5V Measure the voltage power ON. (When fan revolved one time) 0VÔ 5VÔ 0V (Approx.) Normal BRN-other one Abnormal Open or short-circuit Measure the resistance between the terminals with a tester. (Part temperature 10°C ~ 30°C) Color of lead wire Color of lead wire BLK RED WHT GRY YLW BRN 240 " ~ 260 " Color of lead wire MAIN AUX. FUSE RED YLW BRN ORN GRN ROTOR Check of indoor fan motorA When OPERATION INDICATOR lamp flashes 3-time. Indoor fan does not operate. Turn OFF the power supply and check the connector CN 211 visually. No(others) Disconnect connector from CN 211 on indoor electronic control P.C. board. Measure resistance between lead wire 1 and 5 and then 3 and 5. Yes(0 or ∞ ) Is resistance 0"(short circuit) or ∞ (open circuit)? Replace the indoor fan motor. Replace the indoor electronic control P.C. board. CN211 Fan motor Indoor electronic control P.C. board OB327 --1qxp 04.1.8 1:42 PM Page 14

Check of indoor electronic control P.C. boardC The unit doesn’t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch. Indoor electronic control P.C. board Varistor (NR11) Indoor electronic control P.C. board Fuse (F11) 1 3CN201 F12 N Thermal fuse connector Terminal block Check both “parts side” and “pattern side” of indoor electronic control P.C. board visually. Replace the fuse. Is fuse (F11) blown? Replace the fan motor. Is winding resistance of fan motor 0 "? Is winding resistance of vane motor 0 "? No Yes No Replace the vane motor. Yes No Yes Is varistor (NR11) burnt? Replace the varistor. Yes Turn OFF the power supply. Disconnect indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P.C. board and turn ON the power supply. No Does the unit operate with the remote controller or does the OPERATION INDICATOR lamp light up by pressing the EMERGENCY OPERATION switch? Yes No Turn OFF the power supply. Turn OFF the power supply. Replace the indoor electronic control P.C. board.Measure the resistance between CN201 1 on the indoor electronic control P.C. board and N on the terminal block with the tester. Is resistance approx. 0"? Replace the fuse (F12). No Yes (∞ ) Check of remote controller and receiver P.C. board B Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote controller. wCheck if the remote controller is exclusive for this air conditioner. CN302 CN125 CN109 543 Remote controller Indoor electronic control P.C. board Power monitor receiver P.C. board Yes Yes Replace the batteries.(Refer to page 10.) Turn on a radio to AM and press switch on the remote controller. Is noise heard from radio? Are there any fluorescent lights of inverter or rapid-start type within the range of 1m? Measure the voltage between receiver P.C. board connector CN302 No.3(-) and No.5(+) when the remote controller button is pressed. Is the voltage approx. 4V DC? Replace the indoor electronic control P.C. board. Replace the receiver P.C. board. Replace the remote controller. l Reinstall the unit away from lights. l Attach a filter on receiving part. Switch on the remote controller. Is LCD display on the the remote controller visible? Remove the batteries, then set them back and press the RESET button. (Refer to page 10.) Check if the unit operates with the remote controller. Yes Does the unit operate with the remote controller? Yes OK No (not clear) Yes No No No(5V or 0V DC) No OB327 --1qxp 04.1.8 1:42 PM Page 15

When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second or flashes once. Outdoor unit doesn’t operate. Is there voltage approx. 280V DC between LD61A (+) and LD66A (–) on the inverter P.C. board? Is there approx. 230V AC between outdoor terminal block 2 and N when EMERGENCY OPERATION switch is pressed three minutes after turn OFF the power supply and then turn ON again? Is mis-wiring indicated when 52C turns ON three minutes later? w3 Replace the outdoor electronic control P.C. board. Does the OPERATION INDICATOR lamp flash quickly when OPERATE/STOP(ON/OFF) button on the remote controller is pressed? w2 Mis-wiring may damage indoor electronic control P.C. board during the operation in the left. Be sure to confirm the wiring is correct before the operation starts. w3 Replace the indoor electronic control P.C. board. w3 Be sure to release the failure-mode recall function after checking. No w3 Rectify indoor/ outdoor connecting wire. Yes A B Turn OFF the power supply and confirm that indoor/ outdoor connecting wire is correct. Short-circuit indoor terminal block N and 3. During pressing the OPERATION SELECT button and TOO COOL button on the remote controller, press the RESET button. (The above procedure allows OPERATION INDICATOR lamp to indicate the failure-mode.) w2 Open-circuit indoor terminal block N and 3, Check if there is amplitude of 5 to 20V DC between outdoor terminal block N and 3(for confirmation of serial signal) and if there is 230V AC between 2 and N. 1. Turn OFF the power supply. 2. Disconnect the connector between the compressor and the transistor module. 3.Turn ON the power supply. 4. Press the EMERGENCY OPERATION switch. Yes No Yes No Yes No Yes (light up or OFF)

  • Turn OFF inverter-controlled lighting equipment.
  • Turn OFF the power supply and then turn ON again.
  • Press the EMERGENCY OPERATION switch. A B
  • Reinstall the unit away from light.
  • Attach a filter on receiving part. Procedure of release of failure-mode

1 Press the EMERGENCY

OPERATION switch.

2 Turn OFF the power supply and

then turn ON again.

3 Press the RESET button on the

remote controller. Start No

  • Turn ON the power supply.
  • Press once EMERGENCY OPERATION switch. Is this mis-wiring, poor contact, or wire disconnection?Make them sure. Yes After three minutes, mis-wiring is indicated (0.5-second ON, 0.5-second OFF) on OPERATION INDICATOR lamp on 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 3 seconds.
  • The following indication applies regardless of shape of the indicator. Flashing Operation Indicator As for outdoor unit, refer to service manual OB328 or OB319. OB327 --1qxp 04.1.8 1:42 PM Page 16

Check of installation of the horizontal vanesE Turn OFF the power supply. Replace the thermal fuse (F12). Is resistance ∞ between the connector CN 201 1 on indoor electronic control P.C. board and the terminal block N? Yes No CN201 Indoor electronic control P.C. boardOk Start Replace the indoor electronic control P.C. board. Replace the safety device. Is the stopper of the horizontal vane locked to the indoor unit correctly? Yes No Is there resistance 0 "? Relock the stopper of the horizontal vane to the indoor unit. Refer to page 11. Yes Is the OPERATION INDICATOR lamp flashing? Yes No(∞ ) No OK Turn ON the power supply. To check the continuity of safety device, measure the resistance of connector 1 - 3 connected to CN1R1 on the indoor electronic control P.C. board. Turn OFF the power supply. Turn OFF the power supply. When both OPERATION INDICATOR lamps flash 1-time. Indoor unit and outdoor unit don’t operate. Check of thermal fuseF OB327 --1qxp 04.1.8 1:42 PM Page 17

TEST POINT DIAGRAM AND VOLTAGE MSZ-A09YV - MSZ-A12YV - Indoor electronic control P.C. board E1E1 Indoor coil thermistor [RT12 (MAIN), RT13 (SUB)] Room temperature thermistor (RT11) Temperature (:) Resistance (k") Release of Auto restart function Solder the Jumper wire to the JR07. (Refer to page 9.) CN302 Power monitor receiver P.C. board Power supply input 230V AC Varistor (NR11) Fuse F11 250V AC 3.15A Room temperature thermistor RT11 Indoor coil thermistor RT12(MAIN) RT13(SUB) Timer short mode point JPG, JPS (Refer to page 8.) Emergency operation switch Indoor fan motor 230V AC 5V DC 12V DC – } Safety device of fan by horizontal vane CN1R1 R132 J23J33 J33 J12 OB327 --1qxp 04.1.8 1:42 PM Page 18

(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector is a terminal with lock mechanism 1Slide the sleeve. 2Pull the terminal while pushing the locking lever. 1Hold the sleeve, and pull out the terminal slowly. In case of terminal with lock mechanism, detach the terminal as shown below. There are two types ( Refer to (1) and (2)) 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. <"Terminal with lock mechanism" Detaching points> Connector Sleeve Locking lever 9-1. MSZ-A09YV - MSZ-A12YV - INDOOR UNIT E1E1 OPERATING PROCEDURE PHOTOS Photo 11. Removing the panel (1) Remove the screw caps of the panel. Remove the screws. (2) Pull the panel down to your side slightly and unhook the catches at the top. 2. Removing the electronic control P.C. board and the power monitor receiver P.C. board NOTE : In case of removing only indoor electronic control P.C. board work (3) is not necessary. (1) Remove the panel. (Refer to 1.) (2) Remove the power monitor receiver P.C. board holder from the bottom of electrical box. (3) Open the power monitor receiver P.C. board holder and remove the power monitor receiver P.C. board. (4) Remove the screw of the electrical cover and the electrical cover. (6) Remove the screw of the cord clamp and the cord clamp. (7) Remove the screw of the terminal block. (8) Remove the screw of the ground wire. (9) Pull out indoor electronic control P.C. board slightly. (10)Disconnect all (except CN109, CN125) the connectors on the electronic control P.C. board. (11)Remove the electronic control P.C. board. (12)Disconnect the connector of power monitor receiver P.C. board (CN109, CN125) on the electronic control P.C. board. Terminal block fixing screw Screw of the V.A. clamp Indoor electronic control P.C. board Screw of the ground wire Power monitor receiver P.C. board holder Screw of the electrical cover Cord clamp fixing screw Photo 2 Screws of the panel OB327 --1qxp 04.1.8 1:42 PM Page 19

OPERATING PROCEDURE PHOTOS 3. Removing the electrical box (1) Remove the panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Remove the V.A. clamp. (Refer to 2.) (4) Remove the cord clamp. (Refer to 2.) (5) Remove the terminal block. (Refer to 2.) (6) Remove the screw of ground wire. (Refer to 2.) (7) Disconnect the connector of the indoor coil thermistor (CN112), the fan motor connector (CN211 and CN121), the vane motor connector (CN151) and the connector of the safety device (CN1R1) on the electronic control P.C. board. (8) Remove the fan motor lead wire and indoor coil thermistor from the electrical box. (9) Remove the lead wire of vane motor and safety device from the bottom of electrical box. (10) Remove the screw fixing the electrical box, remove the electrical box. Photo 5 Photo 3 Photo 4 Photo 7 Drain hose Screws of the left side of the heat exchanger Screws of the vane motor Photo 6 Indoor coil thermistor connector Fan motor connector Vane motor connector Hooks of the motor band Hexagon socket set screw Screw of the lead cover 4. Removing the nozzle assembly and the vane motor (1) Remove the panel. (Refer to 1.) (2) Remove the electrical box. (Refer to 3.) (3) Pull out the drain hose from the nozzle assembly, remove the nozzle assembly. (4) Remove the screws of the vane motor, disconnect the vane motor connector. (5) Remove the vane motor. 5. Removing the indoor fan motor and the line flow fan (1) Remove the panel. (Refer to 1.) (2) Remove the electrical box. (Refer to 3.) (3) Pull out the drain hose from the nozzle assembly, remove the nozzle assembly. (Refer to 4.) (4) Remove the screw of the lead cover and the lead cover. (5) Remove the lead wire of the fan motor. (6) Release the hooks of the motor band and open it slightly. (7) Loosen the hexagon socket set screw of the line flow fan. (8) Remove the screws fixing the motor bed, remove the fan motor with motor band and the motor bed. (9) Remove the screws fixing the left side of the heat exchanger. (10)Lift the left side of the heat exchanger. (11)Remove the line flow fan. Screw of the electrical box Screws of the motor bed OB327 --1qxp 04.1.8 1:42 PM Page 20

MSZ-A09YV - (WH) MSZ-A12YV - (WH) 10-1. INDOOR UNIT STRUCTURAL PARTS No. Part No. Part name Remarks Symbol in Wiring Diagram Q'ty/unit E02 749 234 E02 751 234 E02 838 000 E02 749 067 E02 838 010 E02 408 142 E02 763 100 E02 764 100 E02 749 975 E02 408 970 E02 751 970 MSZ-A09YV - E1 MSZ-A12YV - E1 E02 838 426 E02 527 083 REMOTE CONTROLLER REMOTE CONTROLLER HOLDER KG04A BOX (WH) BOX (WH) PANEL ASSEMBLY (WH) SCREW CAP FRONT PANEL (WH) CATCH CATECHIN AIR FILTER CATECHIN AIR FILTER AIR CLEANING FILTER CORNER BOX (RIGHT) INSTALLATION PLATE INSTALLATION PLATE Including No.3,4,5 2PCS/SET 2PCS/SET MAC-1300FT (WH) (WH) 10-1. INDOOR UNIT STRUCTURAL PARTS 10-2. ACCESSORY AND REMOTE CONTROLLER 7 (See page 23.) 1 (w) 9 (w) 5 6 1110 10-2. ACCESSORY AND REMOTE CONTROLLER (w) These figures show about MSZ-A12YV. OB327 --1qxp 04.1.8 1:42 PM Page 21

No. Part No. Part name Remarks Symbol in Wiring Diagram Q'ty/unit E02 001 504 E02 661 702 E02 838 235 E02 815 316 E02 838 040 E02 838 041 E02 127 382 E02 829 385 E02 749 385 E02 763 034 E02 815 468 E02 838 452 E02 839 452 E02 749 303 E02 151 308 E02 749 300 E02 751 300 E02 749 333 E02 679 375 E02 665 505 E02 151 505 E02 838 307 E02 749 302 E02 408 509 E02 751 509 E02 408 381 MSZ-A09YV- E1 MSZ-A12YV- E1 E02 749 620 E02 839 620 E02 815 666 E02 151 666 E02 151 667 INDOOR HEAT EXCHANGER INDOOR HEAT EXCHANGER UNION (GAS) UNION (GAS) UNION (LIQUID) {9.52 {9.52 {6.35 SLEEVE BEARING DRAIN HOSE NOZZLE ASSEMBLY (WH) SAFETY DEVICE VANE UPPER VANE LOWER FUSE VARISTOR VARISTOR VANE CRANK SET POWER MONITOR RECEIVER P.C. BOARD ELECTRONIC CONTROL P.C. BOARD ELECTRONIC CONTROL P.C. BOARD VANE MOTOR ROOM TEMPERATURE THERMISTOR INDOOR FAN MOTOR INDOOR FAN MOTOR MOTOR BAND TERMINAL BLOCK FAN MOTOR RUBBER MOUNT FAN MOTOR RUBBER MOUNT INDOOR COIL THERMISTOR LINE FLOW FAN BEARING MOUNT BEARING MOUNT THERMAL FUSE 3.15A AUTO RESTART AUTO RESTART RC4V19- RC4V19- 2PCS/SET 2PCS/SET 93: F11 NR11 NR12 MV RT11 MF MF TB RT12, RT13 F12 (WH) (WH) Part number that is circled is not shown in the illustration. 10-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS 10-3. INDOOR UNIT ELECTRICAL PARTS AND FUNCTIONAL PARTS MSZ-A09YV - (WH) MSZ-A12YV - (WH)E1 144 21 19 7 108 SLEEVE BEARING ROOM TEMPERATURE THERMISTOR FUSE VARISTOR 23 (W) 10-4. INDOOR UNIT HEAT EXCHANGER 10-4. INDOOR UNIT HEAT EXCHANGER 9 (W) This figure shows about MSZ-A12YV. OB327 --1qxp 04.1.8 1:42 PM Page 22

10-5. AIR CLEANING FILTER l AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity. l Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible. l Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. l DO NOT reuse AIR CLEANING FILTER even if it is washed. l DO NOT remove or attach AIR CLEANING FILTER during unit operation. MAC-1300FT Model Part No. MSZ-A09YV - MSZ-A12YV - Air cleaning filter (White bellows type) QUICK CLEAN KIT l You can sweep the surface of heat exchanger if you install the special-made brush to your vacuum cleaner. MAC-093SS-E Model Part No. MSZ-A09YV - MSZ-A12YV - Heat exchanger OB327 --1qxp 04.1.8 1:42 PM Page 23

HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO100-8310, JAPAN CC Copyright 2004 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD Distributed in Jan. 2004. No. OB327 6 Made in Japan New publication, effective Jan. 2004 Specifications subject to change without notice. OB327 --1qxp 04.1.8 1:42 PM Page 24