Mitsubishi Electric MSZ-HE09NA Service Manual Download Page 9

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MSZ-HE09NA MSZ-HE12NA MSZ-HE15NA MSZ-HE18NA

Unit: inch

Indoor

heat

exchanger

Flared connection

Room temperature
thermistor
RT11

Flared connection

Refrigerant pipe ø3/8 (

MSZ-HE09/12NA

)

ø1/2 (

MSZ-HE15/18NA

)

(with heat insulator)

Refrigerant pipe ø1/4
(with heat insulator)

Indoor coil

thermistor

RT12 (main)

Indoor coil

thermistor

RT13 (sub)

Refrigerant flow in cooling

Refrigerant flow in heating

REFRIGERANT SYSTEM DIAGRAM

MSZ-HE24NA

Indoor

heat

exchanger

Flared connection

Room temperature
thermistor
RT11

Flared connection

Refrigerant pipe ø5/8
(with heat insulator)

Refrigerant pipe ø3/8
(with heat insulator)

Indoor coil

thermistor

RT12 (main)

Indoor coil

thermistor

RT13 (sub)

Refrigerant flow in cooling

Refrigerant flow in heating

OBH685

Summary of Contents for MSZ-HE09NA

Page 1: ...UNCTIONS 10 8 MICROPROCESSOR CONTROL 12 9 TROUBLESHOOTING 16 10 DISASSEMBLY INSTRUCTIONS 32 No OBH685 SPLIT TYPE AIR CONDITIONERS INDOOR UNIT Outdoor unit service manual MUZ HE NA Series OBH686 NOTE RoHS compliant products have G mark on the spec name plate PARTS CATALOG OBB685 MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA MSZ HE24NA Models MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA ...

Page 2: ...at 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 OBH685 ...

Page 3: ...ration indicator lamp Remote control receiving section Emergency operation switch E O SW Horizontal vane Air outlet Air filter Air inlet Heat exchanger Front panel Air cleaning filter Anti Allergy Enzyme Filter optioin Display section 2 PART NAMES AND FUNCTIONS OBH685 ...

Page 4: ...tion Air outlet Horizontal vane Heat exchanger MSZ HE24NA ACCESSORIES Model MSZ HE09 12 15 18NA MSZ HE24NA Installation plate 1 1 Attachment screws for the installation plate 4 25 mm 5 7 Battery AAA for the remote controller 2 2 Wireless remote controller 1 1 Felt tape For left or left rear piping 1 1 Air cleaning filter 2 2 OBH685 ...

Page 5: ...NA MSZ HE18NA MSZ HE24NA Power supply V phase Hz 208 230 1 60 Max fuse size time delay Disconnect switch A 15 20 Min circuit ampacity A 1 0 Fan motor F L A 0 76 Airflow Super High High Med Low COOL Dry Wet CFM 533 420 335 272 498 385 300 237 533 420 339 275 498 385 304 240 629 544 470 388 562 486 420 347 HEAT Dry CFM 463 367 304 247 512 431 339 275 629 544 470 360 Moisture removal pt h 2 7 4 6 5 1...

Page 6: ...rature 67 57 14 Maximum humidity 78 Heating Standard temperature 70 60 47 43 Maximum temperature 80 67 75 65 Minimum temperature 70 60 4 5 3 1 OPERATING RANGE 1 POWER SUPPLY Rated voltage Guaranteed voltage V Indoor unit 208 230 V 1 phase 60 Hz Min 187 208 230 Max 253 Model Mode Function Airflow CFM Air speed ft s Coverage ft MSZ HE09NA HEAT Dry 406 20 6 29 5 COOL Dry 321 16 3 23 5 Wet 286 14 5 21...

Page 7: ... ø3 8 16 15 16 Flared connection ø3 8 HE09 12NA ø1 2 HE15 18NA Drain hose Insulation ø1 1 8 O D Connected part ø5 8 O D 4 OUTLINES AND DIMENSIONS MSZ HE24NA 42 7 8 3 16 43 5 16 1 3 4 9 3 8 10 3 16 1 8 11 8 7 8 8 7 8 5 1 16 9 7 16 11 1 16 1 3 4 1 15 16 19 3 4 17 5 16 7 27 32 7 27 32 4 3 8 2 9 16 2 1 2 3 33 1 8 7 1 8 2 9 16 2 9 16 1 3 16 2 1 2 2 9 16 2 5 8 2 1 2 12 13 16 1 8 3 15 16 4 7 8 6 5 16 4 5...

Page 8: ...8 MSZ HE09NA MSZ HE12NA MSZ HE15NA MSZ HE18NA 5 WIRING DIAGRAM MSZ HE24NA OBH685 ...

Page 9: ... Indoor coil thermistor RT12 main Indoor coil thermistor RT13 sub Refrigerant flow in cooling Refrigerant flow in heating 6 REFRIGERANT SYSTEM DIAGRAM MSZ HE24NA Indoor heat exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe ø5 8 with heat insulator Refrigerant pipe ø3 8 with heat insulator Indoor coil thermistor RT12 main Indoor coil thermistor RT13 su...

Page 10: ...peration 3 units operation 4 units operation No 1 unit No modification Same as at left Same as at left Same as at left No 2 unit Solder J1 Same as at left Same as at left No 3 unit Solder J2 Same as at left No 4 unit Solder both J1 and J2 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 in...

Page 11: ...t 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 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 AUTO RESTART FUNCTION automatically starts operation in the same mode ju...

Page 12: ...ng section Operation display section Temperature buttons ON OFF operate stop button Fan speed control button Operation select button Timer mode select button ECONO COOL button 8 1 COOL OPERATION 1 Press OPERATE STOP ON OFF button OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone 2 Select COOL mode with OPERATION SELECT button 3 Press TEMPERATURE buttons TOO WARM or TOO COOL but...

Page 13: ...h the high pressure protection works The indoor fan operates following the cold air prevention control This mode continues until the temperature of indoor heat exchanger falls 3 Defrosting Defrosting starts when the temperature of 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 u...

Page 14: ...s operation select a different mode or press one of the following buttons in ECONO COOL operation ECONO COOL or VANE CONTROL button 8 5 TIMER OPERATION 1 How to set the timer 1 Press OPERATE STOP ON OFF button to start the air conditioner 2 Press TIMER MODE SELECT button to select the operation OFF TIMER ON TIMER TIMER RELEASE Each time this button is pressed the timer mode is changed in sequence ...

Page 15: ...y operation In the test run or emergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until EMERGENCY OPERATION switch is pressed once or twice or the unit receives any signal from the remote controller In the latter case normal operation will start NOTE Do not press EMERGENCY OPERATION switch during normal operation 8 7 3 MINUTE TIME DELAY OPERATION When ...

Page 16: ...ERATION INDICATOR lamp is flashing ON and OFF before starting service work 2 Before servicing check that the connector and terminal are connected properly 3 When the 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 9 2 9 3 and 9 4 4 How to replace batteries Weak batteries may cause the ...

Page 17: ... mode table Refer to 9 2 2 Make sure to check at least two consecutive blinking cycles 2 Releasing the failure mode recall function Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller The outdoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the ...

Page 18: ...of the main indoor coil ther mistor the sub indoor coil thermistor 9 7 3 time flash 2 5 second OFF Serial signal The serial signal from outdoor unit is not re ceived for a maximum of 6 minutes Refer to 9 6 How to check miswiring and serial signal error 11 time flash 2 5 second OFF Indoor fan motor The rotational frequency feedback signal is not emitted for 12 seconds after the indoor fan motor is ...

Page 19: ...n motor Upper lamp Flash ON and OFF at 0 5 second intervals Cause Indoor Outdoor unit Miswiring or trouble of serial signal Upper lamp 2 time flash Cause Indoor unit Trouble of room temperature indoor coil thermistor Upper lamp 3 time flash Cause Indoor unit Trouble of indoor fan motor Upper lamp 4 time flash Cause Indoor unit Trouble of indoor unit control system Upper lamp 5 time flash Cause Out...

Page 20: ...sh 2 5 second OFF It cannot properly read data in the nonvolatile memory of the indoor electronic control P C board Replace the indoor electronic control P C board 5 Outdoor power sys tem Upper lamp flashes 5 time flash 2 5 second OFF It consecutively occurs 3 times that the com pressor stops for overcurrent protection or start up failure protection within 1 minute after start up Refer to How to c...

Page 21: ... control P C board for the chart of thermistor Indoor fan motor MF Check 9 6 MSZ HE09 12 15 18NA Vane motor MV Measure the resistance between the terminals with a tester Temperature 50 86 F 10 30 C Color of the lead wire Normal RED BLK 223 268 Ω MSZ HE24NA Horizontal vane motor MV Measure the resistance between the terminals with a tester Part temperature 50 86 F 10 30 C Color of the lead wire Nor...

Page 22: ...C 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 2 to 6 VDC 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 Measure the voltage between CN211 and while the f...

Page 23: ...he voltage between CN211 and If more than 12 seconds passes after EMERGENCY OPERATION switch is pressed the voltage measured at 2 above goes 0 VDC although the indoor P C board is normal Does the voltage between CN211 and on the indoor electronic control P C board rise to the range of 3 to 6 VDC within 12 seconds after EMERGENCY OPERATION switch is pressed Replace the indoor fan motor Yes The indo...

Page 24: ... the unit operates with the remote controller Yes No Turn ON a radio to AM and press OP ERATE STOP ON OFF button on the remote controller 1 Is noise heard from radio Yes No Replace the remote controller Are there any fluorescent lights of inverter or rapid start type within the range of 3 28 ft 1m 2 Yes No Reinstall the unit away from lights Attach a filter on receiving part Measure the voltage be...

Page 25: ... on the indoor power P C board No Is the resistance of resistor R111 approxi mately 4 Ω No Replace the indoor power P C board the indoor terminal P C board and the indoor fan motor Replace the indoor electronic control P C board Measure the resistance of the vane motor coil Refer to 9 5 Short circuit Replace the vane motor and the indoor electronic control P C board 1 The fan motor connector s lea...

Page 26: ...easure the resistance between CN211 and of the indoor fan motor connector Short circuit Replace the indoor fan motor Short circuit Replace the horizontal vane motor and the indoor electronic control P C board Turn OFF the power supply Check both parts side and pattern side of the indoor electronic control P C board visually Replace the varistor NR11 and fuse F11 3 Are the varistor NR11 burnt and t...

Page 27: ...e inverter P C board repeat 3 6 second OFF and 0 8 sec ond ON quick blinking 3 Yes No Lighted or not lighted Replace the inverter P C board 2 2 Be careful of the residual voltage of smoothing capacitor Is there amplitude of 10 to 20 VDC between the indoor terminal block S2 and S3 Confirmation of serial signal Yes Check the wiring If there are any error of the indoor outdoor connecting wire such as...

Page 28: ...s Correct them No A Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Bridge the outdoor terminal block S2 and S3 1 B 1 Miswiring may damage indoor electronic control P C board during the operation Be sure to confirm the wiring is correct before the opera tion starts Turn ON the power supply Does the LED on the inverter P C board repeat 3 6 second OFF...

Page 29: ... strength or the installation condition combination of specific conditions such as antennas or wiring Check the followings 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...

Page 30: ...gh voltage DC 15 VDC 3 6 VDC 0 6 V Timer short mode point JPG JPS Refer to 7 1 Room temperature thermistor RT11 CN111 Indoor coil thermistor RT12 RT13 CN112 Vane motor CN151 Connector to Indoor power P C board CN10A 12 VDC 5 VDC To disable Auto restart function solder the Jumper wire to JR07 Refer to 7 3 Emergency operation switch E O SW SW1 2 Indoor electronic control P C board GND Room temperatu...

Page 31: ...place the fuse after removing the indoor terminal P C board from the electrical box Power monitor receiver SW P C board Fuse F11 Varistor NR11 Terminal block Indoor fan motor CN211 294 325 VDC GND high voltage DC 15 VDC 3 6 VDC 0 or 15 VDC Resistor R111 To disable Auto restart function solder the Jumper wire to JR07 Refer to 7 3 Timer short mode point JPG JPS Refer to 7 1 Vane motor CN151 5 VDC 12...

Page 32: ... there is a locking lever or not 2 The terminal with this connector has the locking mechanism Slide the sleeve Pull the terminal while pushing the locking lever Hold the sleeve and pull out the terminal slowly Connector Sleeve Locking lever Terminal with locking mechanism Detaching points The terminal which has the locking mechanism can be detached as shown below There are two types refer to 1 and...

Page 33: ...d holder and remove the indoor electronic con trol P C board 11 Remove the room temperature thermistor from the indoor electronic control P C board Photo 2 Photo 3 3 Remove the indoor power P C board the indoor terminal P C board and the electrical box 1 Remove the panel Refer to 1 and the corner box 2 Remove the indoor outdoor connecting wire Refer to 2 2 5 3 Remove the ground wire connected to t...

Page 34: ...out the drain hose from the nozzle assembly and remove the nozzle assembly Photo 4 5 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to 4 2 Remove the screws of the horizontal vane motor unit 3 Disconnect the connector from the horizontal vane motor 4 Remove the screws of the horizontal vane motor 5 Remove the horizontal vane motor from the horizontal vane motor unit Screws o...

Page 35: ... motor band 6 Release the hooks of the motor band Remove the motor band Pull out the indoor fan motor 7 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Refer to Photo 8 8 Remove the screws fixing the left side of the heat exchanger 9 Lift the heat exchanger and pull out the line flow fan to the lower left Photo ...

Page 36: ...nitor receiver holder and pull out the power monitor receiver SW P C board 9 Disconnect all the connectors on the indoor electronic control P C board and unhook all lead wires 10 Remove the screw of the terminal block on the indoor terminal P C board 11 Remove the indoor terminal P C board and the indoor electronic control P C board 3 Removing the indoor electrical box 1 Remove the panel Refer to ...

Page 37: ...6 Pull out the drain hose from the nozzle assembly and remove the nozzle assembly 7 Remove the vane motors Refer to 5 Photo 4 5 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to 4 2 Remove the screws of the horizontal vane motor unit and pull out the horizontal vane motor unit 3 Disconnect the connector from the horizontal vane motor 4 Remove the screws of the horizontal van...

Page 38: ...band 8 Release the hooks of the motor band Remove the motor band Pull out the indoor fan motor 9 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Photo 7 10 Remove the screws fixing the left side of the heat exchanger 11 Lift the heat exchanger and pull out the line flow fan to the lower left Photo 6 Photo 7 Phot...

Page 39: ...ked position Do not pull the lead wire when removing the indoor coil thermistor Holder shape Clip shape When fixing the indoor coil thermistor to the clip shape holder shape part the lead wire should point down 1 Set the indoor coil thermistor in the center of the clip shape part 2 Check the marked mounting position 3 Mount the clip shape part Position and procedure for mounting the clip shape par...

Page 40: ... ELECTRIC CORPORATION Distributed in Feb 2014 No OBH685 Made in Japan New publication effective Feb 2014 Specifications are subject to change without notice HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN ...

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