Mitsubishi Electric MSZ-HM09NA Service Manual Download Page 31

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1. Indoor power P.C. board

Room temperature thermistor (RT11)

Indoor coil thermistor (RT12, RT13)

Temperature (°F)

Resistance (kΩ)

32 50 68 86 104 122 140

MSZ-HM18NA MSZ-HM24NA

12V

GND

Fuse (F11)
T3.15AL250V

Varistor (NR11)

Connector to indoor electronic
control P.C. board (CN20A)

5 V DC

12 V DC

GND

Connector to Indoor fan
motor (CN211)

Resistor (R111)

approximately 4 Ω

Connector to
Terminal block
(CN201)

(+)3-6 V DC

15 V DC

(-) GND (High

voltage DC)

294/325 V DC

(+)0 or 15 V DC

Timer short
mode point
(Refer to
7-1.)

Room temperature thermistor RT11 (CN111)

Connector to
Indoor coil
thermistor
RT12, RT13
(CN112)

Vane motor
(CN151)

Connector to indoor power
P.C. board (CN10A)

12V DC

5V DC

To disable "Auto restart function",cut the
Jumper wire to JR77. (Refer to 7-3.)

Emergency
operation
switch
(E.O. SW)
(SW1)

GND

2. Indoor electronic control P.C. board

OBH746D

Summary of Contents for MSZ-HM09NA

Page 1: ...18NA U1 MSZ HM24NA U1 CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 3 3 SPECIFICATION 5 4 OUTLINES AND DIMENSIONS 7 5 WIRING DIAGRAM 8 6 REFRIGERANT SYSTEM DIAGRAM 10 7 SERVICE FUNCTIONS 11 8 MICROPROCESSOR CONTROL 13 9 TROUBLESHOOTING 17 10 DISASSEMBLY INSTRUCTIONS 32 No OBH746 REVISED EDITION D OBH746 REVISED EDITION C is void Revision D MSZ HM09 12 15NA U2 have been added ...

Page 2: ...ide adequate ventilation After stopping the operation of the air conditioner turn off the power supply breaker and pull the power plug Discharge the capacitor before the work involving the electric parts Precautions during the repair service Do not perform the work involving the electric parts with wet hands Do not pour water into the electric parts Do not touch the refrigerant Do not touch the ho...

Page 3: ... Horizontal vane Air outlet Air ﬁlter Air inlet Heat exchanger Front panel Air cleaning ﬁlter Anti Allergy Enzyme Filter option Remote controller ACCESSORIES Installation plate 1 Attachment screws for the installation plate 4 25 mm 5 Battery AAA for remote controller 2 Wireless remote controller 1 Felt tape For left or left rear piping 1 OBH746D ...

Page 4: ... controller 1 Felt tape For left or left rear piping 1 Battery AAA for remote controller 2 Remote controller Operation indicator lamp Remote control receiving section Emergency operation switch Horizontal vane Air outlet Air ﬁlter Air inlet Heat exchanger Front panel Air cleaning ﬁlter Anti Allergy Enzyme Filter option OBH746D ...

Page 5: ...trol voltage by built in transformer 12 24 V DC NOTE Test conditions are based on AHRI 210 240 Indoor model MSZ HM09NA MSZ HM12NA MSZ HM15NA Power supply V phase Hz 208 230 1 60 Max fuse size time delay Disconnect switch A 15 Min circuit ampacity A 1 0 Fan motor F L A 0 76 Airflow Super High High Med Low COOL Dry Wet CFM 399 321 237 170 364 286 201 134 533 420 335 272 498 385 300 237 HEAT Dry CFM ...

Page 6: ...ed is 1 ft s when air is blown out horizontally from the unit properly at the High speed posi tion The coverage should be used only as a general guideline since it varies accord ing to the size of the room and furniture arranged inside the room Model Mode Function Airflow CFM Air speed ft s Coverage ft MSZ HM09NA HEAT Dry 406 20 6 29 5 COOL Dry 321 16 3 23 5 Wet 286 14 5 21 0 MSZ HM12NA HEAT Dry 4...

Page 7: ...1 16 5 1 2 2 1 4 2 1 4 2 1 2 9 13 16 3 16 35 13 16 36 5 16 1 4 27 15 16 6 5 16 2 1 16 12 2 9 16 2 13 16 2 1 2 2 9 16 3 11 16 2 1 16 9 7 16 10 5 16 1 8 8 7 8 8 7 8 3 11 16 8 3 4 10 3 8 2 5 16 15 7 8 8 11 16 3 11 16 7 8 1 7 16 Oblong hole 7 16 13 16 Oblong hole Installation plate Indoor unit Wall hole Ø3 Air in Installation plate 8 1 16 15 3 16 1 5 8 8 11 16 3 1 11 16 2 9 16 2 9 16 4 1 2 5 3 4 1 4 A...

Page 8: ...8 5 WIRING DIAGRAM MSZ HM09NA U1 MSZ HM12NA U1 MSZ HM15NA U1 MSZ HM09NA U2 MSZ HM12NA U2 MSZ HM15NA U2 OBH746D ...

Page 9: ...9 MSZ HM18NA MSZ HM24NA OBH746D ...

Page 10: ...or RT12 main Indoor coil thermistor RT13 sub Refrigerant flow in cooling Refrigerant flow in heating 6 REFRIGERANT SYSTEM DIAGRAM Indoor heat exchanger Flared connection Room temperature thermistor RT11 Flared connection Refrigerant pipe ø3 8 ø9 52 MSZ HM09 12NA with heat insulator ø1 2 ø12 7 MSZ HM15NA Refrigerant pipe ø1 4 ø6 35 with heat insulator Indoor coil thermistor RT12 main Indoor coil th...

Page 11: ...24NA J2 J1 The remote controller P C board has the print J1 and J2 Solder J1 and J2 according to the number of indoor unit as shown in Table 1 After modification press the RESET button NOTE For modification take out the batteries and press the STOP OPERATE OFF ON button 2 or 3 times at first After finish modification put back the batteries then press the RESET button Table 1 1 unit operation 2 uni...

Page 12: ...h 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 just before the shut off of the main...

Page 13: ...unit is operating to reach the set temperature About 4 F 2 C or more away from set temperature The room temperature is approaching the set tem perature About 2 to 4 F 1 to 2 C from set temperature Lit Blinking Not lit 8 1 COOL OPERATION 1 Press STOP OPERATE OFF ON button OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone 2 Select COOL mode with OPERATION SELECT button 3 Press TE...

Page 14: ...ature of indoor heat exchanger becomes too high 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 ...

Page 15: ... Also the horizontal vane swings in various cycle SWING operation makes you feel cooler than set temperature So even though the set temperature is higher the air conditioner can keep comfort As a result energy can be saved ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL button is pressed or change to other operation mode 8 5 TIMER OPERATION ON OFF TIM...

Page 16: ...mergency operation the horizontal vane operates in VANE AUTO mode Emergency operation continues until the 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 the emergency operation switch during normal operation Operation mode COOL HEAT Set temperature 75 F 24 C 75 F 24 C Fa...

Page 17: ...ng ser vice work 2 Before servicing verify that all connectors and terminals are connected properly 3 When the electronic control P C board seems to be defective check for disconnection of the copper foil pattern and burnt or discolored components 4 When troubleshooting refer to 9 2 9 3 and 9 4 4 How to replace batteries Weak batteries may cause the remote controller malfunction In this case repla...

Page 18: ...ring to the table of indoor unit failure mode recall function Refer to 9 2 2 Make sure to check at least 2 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 ...

Page 19: ...stics of the main indoor coil ther mistor the sub indoor coil thermistor 9 7 3 time blink 2 5 second OFF Serial signal The serial signal from outdoor unit is not re ceived for a maximum of 6 minutes Refer to 9 6 How to check miswiring and serial signal error 11 time blink 2 5 second OFF Indoor fan motor The rotational frequency feedback signal is not emitted for 12 seconds after the indoor fan mot...

Page 20: ...ink ON and OFF at 0 5 second intervals Cause Indoor Outdoor unit Miswiring or trouble of se rial signal Upper lamp 2 time blink Cause Indoor unit Trouble of room temperature indoor coil thermistor Upper lamp 3 time blink Cause Indoor unit Trouble of indoor fan motor Upper lamp 4 time blink Cause Indoor unit Trouble of indoor unit control system Upper lamp 5 time blink Cause Outdoor unit Outdoor po...

Page 21: ...onic control P C board Replace the indoor electronic control P C board 5 Outdoor power system Upper lamp blinks 5 time blink 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 check of in verter compressor Refer to outdoor unit service manual Check the stop valve 6 Outdoo...

Page 22: ...RT12 RT13 Measure the resistance with a multimeter Refer to 9 7 Test point diagram and voltage 1 or 2 Indoor electronic control P C board for the chart of thermistor Indoor fan motor MF Check 9 6 Horizontal vane motor MV Measure the resistance between the terminals with a multimeter Part temperature 50 86 F 10 30 C Color of the lead wire Normal RED BLK 223 268 Ω BLK BLK RED BLK BLK ROTOR ROTOR OBH...

Page 23: ... C board is normal Does the voltage between CN211 and on the power P C board rise to the range of 3 to 6 V DC within 12 seconds after the emergency operation switch is pressed Replace the indoor fan motor Yes No The indoor fan motor error has occurred and the indoor fan repeats 12 second ON and 30 second OFF 3 times and then stops Measure the voltage between CN211 and while the fan motor is rotati...

Page 24: ...type within the range of 3 28 ft 1m 2 Yes No Reinstall the unit away from lights Attach a filter on receiving part Replace the indoor electronic control P C board Including the receiver 1 Look at the image of the signal transmitting section of the remote controller through the monitor of a digital camera or a camera phone It is normal if the LED of the signal transmitting section lights up when th...

Page 25: ...SZ HM09 12 15NA Replace the indoor electronic control P C board Measure the resistance of the vane motor coil Refer to 9 5 Short open 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 multimeter to fan motor connector s lead wire and to lead wire otherwise the resistance cannot be measured prope...

Page 26: ...ond ON quick blinking 3 Yes No Lit or not lit Replace the inverter P C board or the outdoor electronic control P C board 2 2 Be careful of the residual voltage of smoothing capacitor Is there amplitude of 10 to 20 V DC between 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 the damage of the wir...

Page 27: ...e the opera tion starts Turn ON the power supply Does the LED on the inverter P C board repeat 3 6 second OFF and 0 8 sec ond ON quick blinking 3 Yes No Lit or not lit Replace the inverter P C board or the outdoor electronic control P C board 2 2 Be careful of the residual voltage of smoothing capacitor Turn OFF the power supply Remove the bridge between outdoor terminal block S2 and S3 Yes 3 Be s...

Page 28: ... 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 29: ...an motor CN211 0 6 V 3 6 V DC 15 V DC GND high voltage DC 294 325 V DC Timer short mode point JPG JPS Refer to 7 1 Room temperature thermistor RT11 CN111 Indoor coil ther mistor RT12 RT13 CN112 Vane motor CN151 Connector to Indoor power P C board CN10A 12 V DC 5 V DC To disable Auto restart function solder the Jumper wire to JR07 Refer to 7 3 Emergency operation switch SW1 2 Indoor electronic cont...

Page 30: ... V DC Timer short mode point Refer to 7 1 Room temperature thermistor RT11 CN111 Indoor coil ther mistor RT12 RT13 CN112 Vane motor CN151 Connector to Indoor power P C board CN10A 12 V DC 5 V DC To disable Auto restart function solder the Jumper wire to JR07 Refer to 7 3 Emergency operation switch SW1 2 Indoor electronic control P C board GND Room temperature thermistor RT11 Indoor coil thermistor...

Page 31: ...r fan motor CN211 Resistor R111 approximately 4 Ω Connector to Terminal block CN201 3 6 V DC 15 V DC GND High voltage DC 294 325 V DC 0 or 15 V DC Timer short mode point Refer to 7 1 Room temperature thermistor RT11 CN111 Connector to Indoor coil thermistor RT12 RT13 CN112 Vane motor CN151 Connector to indoor power P C board CN10A 12V DC 5V DC To disable Auto restart function cut the Jumper wire t...

Page 32: ... there is a locking lever or not 2 The terminal with the connector shown below 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 Detaching method of the terminal with locking mechanism The terminal which has the locking mechanism can be detached as shown below There are 2 type...

Page 33: ... electronic control P C board Photo 2 Photo 3 Photo 4 3 Removing the indoor power P C board the indoor terminal P C board and the electrical box 1 Remove the panel Refer to section 1 and the corner box 2 Remove the indoor outdoor connecting wire and the indoor electric control P C board holder Refer to section 2 2 8 3 Remove the screw of the conduit cover and the con duit cover 4 Remove the screw ...

Page 34: ...ull out the drain hose from the nozzle assembly and remove the nozzle assembly Photo 5 5 Removing the horizontal vane motor 1 Remove the nozzle assembly Refer to section 5 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 u...

Page 35: ...Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it Photo 9 9 Remove the screws fixing the left side of the heat exchanger 10 Lift the heat exchanger and pull out the line flow fan to the lower left When attaching the line flow fan screw the line flow fan so 5 32 inch 4 mm gap is provided between the right end of th...

Page 36: ...ssembly OPERATING PROCEDURE PHOTOS FIGURES 1 Removing the panel 1 Remove the screw caps on the panel and remove the screws of the panel 2 Pull the panel slightly toward you and then remove the panel by pushing it upward 36 Photo 1 Screws of the panel Front panel OBH746D ...

Page 37: ...he water cover and remove the water cover 12 Remove the screw of the electrical cover and remove the electrical cover 13 Disconnect the CN211 Indoor fan motor from the indoor power P C board 14 Remove the upper catch of the electrical box and pull out the electrical box To attach the electrical box pass the wires connecting the indoor power P C board and the indoor electronic control P C board thr...

Page 38: ...k side of the control P C board holder 5 Unhook the catches of the control P C board holder and open the control P C board holder 6 Remove the indoor electronic control P C board from the control P C board holder 4 Removing the vane motor 1 Remove the panel Refer to section 1 Remove the corner box 2 Remove the control P C board holder water cover and the electrical box Refer to section 2 3 Pull ou...

Page 39: ...d and remove the motor band Pull out the indoor fan motor 8 Remove the indoor coil thermistor from the heat exchanger Install the indoor coil thermistor in its former position when assembling it 9 Remove the screws fixing the left side and upper right side of the heat exchanger 10 Lift the heat exchanger and pull out the line flow fan to the lower left When attaching the line flow fan screw the li...

Page 40: ...he indoor coil thermistor to the clip shape holder shape part the lead wire should point down 1 Set the indoor coil thermistor in the center of the clip shape part 2 Check the marked mounting position 3 Mount the clip shape part Position and procedure for mounting the clip shape part About the same length Copyright 2015 MITSUBISHI ELECTRIC CORPORATION Issued Feb 2022 No OBH746 REVISED EDITION D Is...

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