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Mitsubishi Mr.Slim MSZ-FE09NA Service manual

1. Bus bar voltage Smoothing Smoothing Smoothing DB61 capacitor capacitor capacitor Fuse F701 Back side or unit 260 325 C63 C62 C61 T3 15AL250V Fuse F801 208 230 VAC T3 15AL250V R V coil APT CN721 ry f z j E 208 230 VAC Bs ERN Bo bz Bo 1o Pa CE peels 7 E gj 2 X ee 2 o o Es Se EI Zu NI 4 Fuse 901 img ERES z2 Men RET d T3 15AL250V gro o o o ps i LS MS o to EO a li MB NE ous E e drive com p ME x E Ps pressor m 22 5 B 549 je vois 28 80420 45 9 8208 230 VAC LDU TV o B p LDV 1 BSE 5 ul 4 B 5 H oo tias a LDW 4 i 20 non 7j B St ae a Qu i B ne AT iore d o 21 DM gi o o Bo so e is D vee s sei 42 I E IH is Ro 555 fe o
2. JP715 Bus bar voltage Defrost thermistor RT61 Ambient temperature thermistor RT65 325 370 VDC Outdoor heat exchanger temperature thermistor RT68 JP30 Fin temperature thermistor RT64 00 Discharge temperature thermistor RT62 0 5 on E 2 2 o 3 E 8 j 9 AHHH g E 9 14 32 50 68 86 104 032 50 68 86 104 122 140 E 176 194 202 230 248 32 50 68 Temperature F Temperature F 35 NL Pallant 6 104 122 140 15 Temperature F 176 11 DISASSEMBLY INSTRUCTIONS 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 2 of the terminal with locking mechanism The terminal without locking mechanism can be detached by pulling it out Check the shape of the terminal before detaching 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector has the locking mechanism Slide the sleeve Hold the sleeve and GPull the terminal while pull out the terminal pushing the locking slowly lever Connector 11 1 MUZ FEO9ONA MUZ FE12NA NOTE Turn OFF power supply before disassembli
3. MUZ FE09NA PSIG PSIG 400 170 75 380 160 58 360 A 75 450 340 22 140 x 5 320 ew 130 Se o 2 QN 9 300 OS 98 wee 9120 9 2 280 P 60 2 110 Ko 9 S 100 S o 240 NS 5 90 58Hz 5220 58Hz 200 80 180 70 160 60 140 50 20 40 o 15 10 5 10 15 20 25 30 35 40 45 50 55 60 6570 F 15 10 5 10 15 20 25 30 35 40 45 50 55 60 6570 F Outdoor ambient temperature Outdoor ambient temperature MUZ FE12NA PSIG PSIG 400 170 380 160 75 75 65 360 150 340 ee 0 ave 65 140 2 320 ee 130 PN 2 300 e oO 2120 RS 5 280 SS 5110 260 ovr 2 5100 m 240 5 5 9 gt 90 9 220 58Hz 2 200 80 58Hz 180 70 160 60 140 50 120 40 15 10 5 10 15 20 25 30 35 40 45 50 55 60 6570 F 15 10 5 10 15 20 25 30 35 40 45 50 55 60 6570 F Outdoor ambient temperature Outdoor ambient temperature MUZ FE18NA PSIG PSIG 480 240 460 220 75 75 70 440 200 65 420 70 180 5 400 65 160 2 5 380 92 140 360 amp 120 340 8 100 o z 8 320 ex 2 5 8 60 Indoor DB temperature CF ON 58Hz 280 lt 0 40 58Hz K 260 S S pt EN EM 20 240 15 10 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 F 015 10 5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 F Outdoor ambient temperature Outdoor ambient temperature 13 7 4 STANDARD OPERATION DATA MSZ FE09NA MSZ FE12NA MSZ FE18NA Cooling Heating Coo
4. Piping 4 i Air outlet Drain outlet 3 SPECIFICATION 027 09 9 000 2 800 9 000 10 900 3 000 18 000 Outdoor unit model MUZ FE12NA 12 000 2 800 12 000 MUZ FE18NA 18 000 8 200 25 200 Cooling 31 Heating 47 x1 Capacity Rated Minimum Maximum 13 600 3 000 21 000 21 600 7 500 29 700 Capacity Rated Heating 17 32 12 500 13 600 19 300 Power consumption Cooling s 580 160 650 930 160 960 1 270 570 2 280 Rated Minimum Maximum Heating 47 x1 710 150 2 250 950 150 2 250 1 540 520 2 420 Power consumption Rated Heating 17 K2 1 730 1 780 2 180 EER 1 SEER 3 amp 3 Cooling 15 5 26 0 12 9 23 0 14 2 20 2 HSPF IV 34 Heating 10 0 10 6 10 3 COP Heating 31 4 50 4 20 4 11 Power supply V phase Hz 208 230 1 60 Max fuse size time delay A 15 20 Min circuit ampacity A 12 17 1 Fan motor F L A 0 56 0 93 SNB130FQAH SNB172FQKMT Compressor R L A 8 6 12 9 L R A 10 8 16 1 Refrigeration oil L Model 0 45 NEO22 0 40 FV50S Refrigerant control Linear expansion valve Cooling dB A 48 55 s Sound level 31 Heating dB A 49 55 Defrost method R
5. Cu 50 F 10 64 F 18 C 9 2 PRE HEAT CONTROL SETTING PRE HEAT CONTROL When moisture gets into the refrigerant cycle it may interfere the start up of the compressor at low outside tempera ture The pre heat control prevents this interference The pre heat control turns ON when outside temperature is 68 F 20 C or below When pre heat control is turned ON compressor is energized About 50 W lt JK gt To activate the pre heat control cut the JK wire of the inverter P C board Refer to 10 6 1 NOTE When the inverter P C board is replaced check the Jumper wires and cut solder them if necessary 10 TROUBLESHOOTING MUZ FE09NA MUZ FE12NA MUZ FE18NA 10 1 1 CAUTIONS ON TROUBLESHOOTING Before troubleshooting check the following 1 Check the power supply voltage 2 Check the indoor outdoor connecting wire for miswiring Take care of the following during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with the remote controller then after con firming 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 electrical parts be careful of the residual voltage of smoothing capacitor 4 When removing the electronic control P C board hold the edge
6. Reconnect connector of compres sor Refer to 10 5 How to check in verter compressor 10 time flash 2 5 seconds OFF Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start up Refer to 10 5 Check of outdoor fan motor Refer to 10 5 Check of inverter P C board 12 time flash 2 5 seconds OFF Each phase current of compressor Each phase current of compressor cannot be detected nor mally Refer to 10 5 How to check in verter compressor 13 time flash 2 5 seconds OFF DC voltage DC voltage of inverter cannot be detected normally Refer to 10 5 How to check verter compressor Outdoor unit operates 1 time flash 2 5 seconds OFF Frequency drop by current protection Current from power outlet is nearing Max fuse size The unit is normal but check the following 3 time flash 2 5 seconds OFF Frequency drop by high pressure pro tection Temperature of indoor coil thermistor exceeds 131 F 55 C in HEAT mode compressor frequency lowers Check if indoor filters are clogged Check if refrigerant is short Check if indoor outdoor unit air cir culation is short cycled Frequency drop by defrosting in COOL mode Indoor coil thermistor reads 46 8 or less in COOL mode compressor frequency lowers 4 time flash 2 5 seconds OFF Frequency drop by discharge tempera ture
7. lt gt Compressor OFF ON 8 2 R V COIL CONTROL OFF Heating Verses E Mes agen wake uo ON Cooling e iios ate cad lode OFF p Seite aves OFF NOTE The 4 way valve reverses for 5 seconds right before start up of the compressor COOL HEAT 5 seconds 5 seconds ON Foo Compressor i _ ON OFF H A Outdoor fan ON cams o OFF motor 8 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Actuator Sensor Purpose Outdoor gy Indoor fan Compressor fan motor motor Discharge temperature thermistor Protection Cooling Coil frost prevention Heating High pressure protection Cooling High pressure protection Heating Defrosting Q O Indoor coil temperature thermistor Defrost thermistor Fin temperature thermistor Protection Outdoor heat exchanger temperature thermistor High pressure protection Ambient temperature thermistor Low ambient temperature operation 16 9 SERVICE FUNCTIONS MUZ FE09NA MUZ FE12NA MUZ FE18NA 9 1 CHANGE IN DEFROST SETTING Changing defrost finish temperature JS To change the defrost finish temperature cut solder the JS wire of the outdoor inverter P C board Refer to 10 6 1 Defrost finish temperature MUZ FE09 12NA MUZ FE18NA Jumper Soldered Initial setting 41 F 5 C 50 F 10 C
8. v _ _ 8932 g 1 219 9 9 3 1 99 9 9t 15 9 9 ol e Lo CONNECTING WIRE 1 About the indoor side electric 9 A e ie L 33 de Fron INDOOR UNIT wiring refer to the indoor T CONNECTING WIRES unit electric wiring diagram 3 T64 G1 RTG 52 for servicing MF n INDOOR UNIT 2 copper conductors only LEV G 1 pe e CONNECTING WIRES For field wiring 208 230V SYMBOL NAME SYMBOL NAME SYMBOL NAME CURRENT TRANSFORMER L62 CMC COIL preg OUTDOOR HEAT EXCHANGER C62 C63 SMOOTHING CAPACITOR LEV EXPANSION VALVE COIL TEMP THERMISTOR 0861 0865 DIODE MODULE MC COMPRESSOR TB TERMINAL BLOCK DSA SURGE ABSORBER FAN MOTOR 21 SWITCHING POWER TRANSISTOR FOOL FUSE T3 15AL250V 6 PTC65 CIRCUIT PROTECTION T801 TRANSFORMER H DEFROST HEATERIOPTION PARTSI RT61 DEFROST THERMISTOR X63 X64 X66 RELAY 10800 INTELLIGENT POWER DEVICE RT62 DISCHARGE TEMP THERMISTOR 2154 REVERSING VALVE COIL IPM 1C932 INTELLIGENT POWER MODULE RT64 FIN TEMP THERMISTOR 26H HEATER PROTECTORIOPTION PARTS 161 REACTOR R165 AMBIENT TEMP THERMISTOR POWER SUPPLY 208 230V 1 phase 60Hz CIRCUIT xu MICHEL E es BREAKER anu TABG1 L1 POTTTRED RED tn il LOSS X b de sa al FR ITI a a 2 a ea m GRN YLW Ls vow 17
9. HOM 8 1 0 shiz TO INDOOR UNIT T all glo ee ame pall phase 6041 i LED T801 F880 F901 gt lt 492 e ex e C P rep 1 x INVERTER 53 P BOARD lez C932 2 INDOOR UNIT z 2 5 CONNECTING WIRES zd i 1 CN671 6 CN672 CN673 1 CN724 6 DC12 24V 19 MORS 2154 t SYMBOL NAME SYMBOL NAME 3 SMOOTHING CAPACITOR PTC64 FUSE T3 15AL250V CIRCUIT PROTECTION CIRCUIT PROTECTION RT61 62 RT68 RT65 FUSE T2AL250V DEFROST THERMISTOR FUSE 6 3AL250V DISCHARGE TEMP THERMISTOR FUSE T3 15AL250V FIN TEMP THERMISTOR FUSE T3 15AL250V AMBIENT TEMP THERMISTOR INTELLIGENT POWER MODULE INTELLIGENT POWER MODULE TEMP THERMISTOR OUTDOOR HEAT EXCHANGER REACTOR TBA TERMINAL BLOCK TRANSFORMER RELAY RELAY POWER FACTOR CONTROLLER 2154 REVERSING VALVE SOLENOID COIL RT64 NOTES 1 About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing 2 Use copper conductors only for field wiring 3 Symbols indicate CI Terminal block LEV 6 REFRIGERANT SYSTEM DIAGRAM MUZ FE09NA MUZ FE12NA Unit inch Refrigerant pipe 93 8 4 way valve with heat insulator Muffler Outdoor h
10. Gas pipe 6 23 32 2 3 8 13 16 Oval hole 15 3 4 5 Air in REQUIRED SPACE 23 32 2 Liquid refrigerant pipe joint Refrigerant pipe flared 3 8 Gas refrigerant Refrigerant pipe flared 2 5 8 pipe joint zii 6 6 9 2 holes 13 32 13 16 Drain hole 1 5 8 gt 31 1 2 19 11 16 16 7 16 6 7 8 Air in c handle celi W 11 29 32 5 1516 19 11 16 8 9 12 MUZ FE18NA 619 2 8 G v 5 MUZ FE09NA MUZ FE12NA WIRING DIAGRAM 2 4 2 2 o gt i 1 2 NEP EE MEME 1 zi Ue 0865 oa l 1 PARTS 1 gp SS pep eek ax oe CIRCUIT 1 MCU MA i LN PONER SUPPLY Jar re phase 1 D INVERTER BOARD 3 i cusa ensar ami I
11. If light up OK If flash refer to 10 3 260 325VDC OF Inverter P C board Solder side 28 MUZ FE18NA Disconnect the connector between compressor and intelligent power module Turn ON power supply and press EMERGENCY OPERATION switch Rectify indoor outdoor connecting wire Yes Does the upper lamp of Is there voltage 208 230 VAC Replace the indoor OPERATION INDICATOR on the No between the indoor terminal No electronic control P C indoor unit light up block 51 and S2 board jes Is there bus bar voltage 325 370 VDC between JP715 and JP30 Does LED on the inverter P C Replace the inverter on the inverter P C board Yes board light up or flash Refer No P C board Refer to 10 6 1 10 6 1 ys Check the electric parts in main circuit If LED lights up it is OK If LED flashes refer to 10 3 JP30 JP715 325 370 VDC 29 MSZ FE09NA MSZ FE18NA K Check of LEV Expansion valve MSZ EET2NA ON the power supply Preparation of the remote controller While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button First release RESET button And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds Y
12. Liquid MUZ FEO9NA MUZ FE12NA MUZ FE18NA 50 3 8 Indoor unit Max Height difference B Max Length A Outdoor unit ADDITIONAL REFRIGERANT CHARGE R4104A oz NOTE Refrigerant piping exceeding 25 ft requires additional refrigerant charge according to the calculation Refrigerant piping length one way ft 30 40 50 60 Model Outdoor unit precharged MUZ FE09NA MUZ FE12NA 2 lb 9 oz 1 62 4 86 8 10 11 34 Calculation X oz 1 08 5 oz ft x Refrigerant piping length ft 25 NOTE Refrigerant piping exceeding 33 ft requires additional refrigerant charge according to the calculation Outdoor unit Refrigerant piping length one ft precharged 50 60 70 80 MUZ FE18NA 4 Ib 3 oz 10 06 15 98 21 90 27 82 Calculation X oz 2 96 5 oz ft x Refrigerant piping length ft 33 Model MUZ FE09NA MUZ FE12NA MUZ FE18NA 7 1 PERFORMANCE DATA 1 COOLING CAPACITY Indoor air 7 DATA Outdoor intake air DB temperature F 85 95 105 IWB SHC TPC TC SHC TPC TC SHC MUZ FE09NA 71 6 5 0 63 9 7 6 1 0 68 9 0 5 6 67 7 4 0 60 9 0 6 8 0 65 8 4 6 4 63 8 1 0 58 8 5 7 6 0 62 7 7 6 9 MUZ FE12NA 71 8 2 0 94 7 7 1 01 7 2 67 9 5 0 89
13. 4 104 F 20 40 Color of lead wire RED BLK BLK WHT WHT RED Normal 11 160 V coil 2154 Measure the resistance using a tester Part temperature 14 104 F 10 40 C Normal 0 97 1 38 Expansion valve coil LEV Measure the resistance using a tester Part temperature 14 104 F 10 40 C Color of lead wire WHT RED RED ORN YLW BRN BRN BLU Normal 37 540 23 10 5 TROUBLESHOOTING FLOW How to check inverter compressor Disconnect the connector between compressor and the intelligent power module IPM Y Check the voltage between terminals prev See 10 5 Check of open phase Y Are the voltages balanced No Replace the inverter P C board Yes Check the compressor vvv See 10 5 Check of compressor Check of open phase e With the connector between the compressor and the intelligent power module disconnected activate the inverter and check if the inverter is normal by measuring the voltage balance between the terminals Output voltage is 50 130 V The voltage may differ according to the tester lt lt Operation method Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERA TION Refer to 7 6 M
14. 8 8 0 96 8 1 63 0 85 9 7 0 92 8 9 MUZ FE18NA 71 1 24 1 33 12 7 67 1 17 1 27 14 1 63 1 12 1 21 15 0 NOTE 1 IWB Intake air wet bulb temperature Total Capacity x10 Btu h SHC Sensible Heat Capacity x10 Btu h TPC Total Power Consumption KW 2 SHC is based on 80 F of indoor Intake air DB temperature 2 COOLING CAPACITY CORRECTIONS Refrigerant piping length one way ft 25 std 40 65 MUZ FEO9NA MUZ FE12NA 1 0 0 954 0 878 MUZ FE18NA 1 0 3 HEATING CAPACITY Indoor air 0 954 0 878 Outdoor intake air WB temperature F IDB F 25 35 43 TC TPC TC TPC TC TPC MUZ FE09NA 75 7 9 0 66 9 4 0 73 0 77 70 8 2 0 64 9 6 0 71 0 75 65 8 6 0 62 0 69 0 73 MUZ FE12NA 75 9 9 0 86 0 96 1 00 70 0 84 0 93 0 98 65 0 81 0 91 0 96 MUZ FE18NA 75 1 35 1 50 1 58 70 1 32 1 46 1 54 65 1 27 1 42 1 50 NOTE 1 IDB Intake air dry bulb temperature TC Total Capacity x10 Btu h TPC Total Power Consumption KW 2 Above data is for heating operation without any frost How to operate with fixed operational frequency of the compressor
15. Check stop valve 7 time flash 2 5 seconds OFF Fin temperature P C board temperature 7 time flash 2 5 seconds OFF Temperature of fin temperature thermistor on the inverter P C board exceeds 167 176 F 75 80 C or temperature of P C board temperature thermistor on the inverter P C board exceeds 158 167 F 70 75 Check around outdoor unit Check outdoor unit air passage Refer to 10 5 0 Check of outdoor fan motor 8 time flash 2 5 seconds OFF Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start up Refer to 10 5 D Check of outdoor fan motor Refer to 10 5 O Check of inverter P C board 9 time flash 2 5 seconds OFF Nonvolatile memory data 5 time flash 2 5 seconds OFF Nonvolatile memory data cannot be read properly Replace the inverter P C board MUZ FE18NA Power module 6 time flash 2 5 seconds OFF The interphase short circuit occurs in the output of the intelligent power module IPM The compressor winding shorts circuit Refer to 10 5 How to check inverter compressor 10 time flash 2 5 seconds OFF Discharge temperature Temperature of discharge temperature thermistor has been 122 F 50 C or less for 20 minutes Refer to 10 5 Check of LEV refrigerant circuit and refrigerant amount 11 time flash 2 5 seconds OFF DC voltage 8 time fla
16. Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 1 Y 1 Regardless of normal or abnormal condition a short beep Expansion valve operates in full opening direction is emitted once the signal is received y Do you hear the expansion valve click click sses 2 Do you feel the expansion valve vibrate Yes on touching it No y Is LEV coil properly fixed to Properly fix the LEV coil to the expansion valve the expansion valve No Yes Measure each voltage between connector pins of CN724 on the inverter P C board Y 1 Pin Pin Does the resistance of LEV 2 Pin Pin coil have the characteristics Yes 3 Pin Pin Pase the inverter P C Refer to 10 4 4 Pin Pin No Is there about 3 5 VAC between each NOTE Measure the voltage by an analog tester Replace the LEV coil Yes Replace the expansion valve NOTE After check of LEV do the undermentioned operations 1 Turn OFF the power supply and turn ON it again 2 Press RESET button on the remote controller 30 2 D Check of inverter P C board Check the outdoor fan motor Refer to 10 5 00 y Is the fuse F901 blown on the in verter P C board Yes No Y Check the connection of the connec
17. Refer to 10 2 2 3X1 Regardless of normal or abnormal once the signal is received Yes The indoor unit is abnormal failure mode table Refer to indoor unit service manual Make sure to check at least two consecutive blinking cycles 2 Check the blinking pattern and confirm the abnormal point with the indoor unit The outdoor unit is abnormal Check the blinking pattern and confirm the abnormal point with the outdoor unit failure mode table Refer to 10 2 3 Make sure to check at least two consecutive blinking cycles 3 Releasing the failure mode recall function Y 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 Y Repair the defective parts Deleting the memorized abnormal condition V After repairing the unit recall the failure mode again according to Setting up the failure mode recall function mentioned above Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted Release the failure mode recall function according to Releasing the failure mode recall function mentioned above NOTE 1 Make sure to release the failure mode recall function
18. antennas and the indoor unit within 9 91 ft or is the distance between the antennas and Yes the outdoor unit within 9 91 ft No Extend the distance between the antennas and the indoor unit and or the antennas and the outdoor unit radios and the indoor unit within 3 28 Extend the distance between the TV sets and or ft or is the distance between the TV radios and the indoor unit or the TV sets or sets or radios and the outdoor unit Yes radios and the outdoor unit within 9 91 ft Is the distance between the TV sets or No Are the antennas damaged Is the coaxial cable damaged Replace or repair the antenna Is there any poor contact in the anten Yes Replace or repair the coaxial cable aU UE dus ET E n na wiring 8 Is the indoor outdoor connecting wire Extend the distance between the indoor outdoor of the air conditioner and the wiring of connecting wire of the air conditioner and the wir the antennas close Yes ing of the antennas Even if all of the above conditions are fulfilled the electromagnetic noise may enter depending on the electric field 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
19. noise 3 Channel frequency broadcast station unaffected by the electromagnetic noise 4 Layout of indoor outdoor unit of the air conditioner indoor outdoor wiring grounding wire antennas wiring from antennas receiver Electric field intensity of the broadcast station affected by the electromagnetic noise Presence or absence of amplifier such as booster Operation condition of air conditioner when the electromagnetic noise enters in 1 Turn OFF the power supply once and then turn ON the power supply In this situation check for the electromagnetic noise 2 Within 3 minutes after turning ON the power supply press OPERATE STOP ON OFF button on the remote controller for power ON and check for the electromagnetic noise 3 After a short time 3 minutes later after turning ON the outdoor unit starts running During operation check for the elec tromagnetic noise 4 Press OPERATE STOP ON OFF button on the remote controller for power OFF when the outdoor unit stops but the indoor outdoor communication still runs on In this situation check for the electromagnetic noise 33 10 6 TEST did AND VOLTAGE 1 Inverter P C b MUZ FE09NA MUZ FE12NA
20. of the board with care NOT to apply stress on the components 5 When connecting or disconnecting the connectors hold the housing of the connector DO NOT pull the lead wires Incorrect Correct S S Lead wiring Housing point 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 When the electronic control P C board seems to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 4 Refer to 10 2 and 10 3 17 10 2 FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once Even though LED indication listed on the troubleshooting check table 10 3 disappears the memorized failure details can be recalled 1 Flow chart of failure mode recall function for the indoor outdoor unit Operational procedure MSZ FE09NA MSZ FE12NA MSZ FE18NA The cause of abnormality cannot be found because the abnormality does not recur Setting up the failure mode recall function 1 Turn ON the power supply lt Preparation of the remote controller gt r
21. once it is set up otherwise the unit cannot operate properly 2 If the abnormal condition is not deleted from the memory the last abnormal condition is kept memorized X2 Blinking pattern when the indoor unit is abnormal Blinking at 0 5 2 5 second OFF second interval 4 gt 4 Blinking at 0 5 2 5 second OFF second interval gt lt t Beeps 11451 OFF lt gt lt gt lt gt lt gt lt gt Beeps Beeps I Repeated cycle 3 3 Blinking pattern when the outdoor unit is abnormal Blinking at 0 5 second interval 2 5 second OFF 3 second ON No bee Repeated cycle Beeps Repeated cycle 1 2 5 second OFF X m in Hoy LE IE I pT OFF 4 5 lt 7 gt lt gt i p p 18 Repeated cycle Blinking at 0 5 3 second ON second interval No bee Beeps Repeated cycle Repeated cycle 2 Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal Confirm if outdoor unit is abnormal according to the following procedures Y Confirm that the remote controller is in the failure mode recall function With the remote controller headed towards the indoor unit press TOO COOL or TOO WARM button to adjust the set temperature to 77
22. x1 inverter P C Y Turn ON the power supply Y Is the bus bar voltage of the inverter Refer to TEST POINT DIAGRAM AND VOLTAGE in this manual P C board normal Yes Y Does the LED on the inverter P C board repeat 3 6 second OFF and 0 8 second ON quick blinking X3 No Y Lighted es or not Y lighted Turn OFF the power supply Remove the short circuit between outdoor terminal block S2 and S3 A Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again Press EMERGENCY OPERATION Switch Reinstall either the unit or the light away from each other Attach a filter on remote control receiv ing section Is serial signal error indicated 6 minutes later of the indoor unit Y Replace the indoor electronic control P C board 32 Be sure to confirm the wiring is correct before the opera Be sure to check this within 3 minutes after turning ON After 3 minutes LED blinks 6 times Even when the board or the outdoor electronic control P C board is normal LED blinks 6 times after 3 minutes No Replace the inverter P C board X2 X2 Be careful of the residual voltage of smoothing capacitor 2447 Electromagnetic noise enters into sets or radios Is the unit grounded No Ground the unit Yes Is the distance between the
23. 1 Press the EMERGENCY OPERATION switch on the front of the indoor unit and select either EMERGENCY COOL mode or EMERGENCY HEAT mode before starting to operate the air conditioner The compressor starts with operational frequency The fan speed of the indoor unit is High This operation continues for 30 minutes In order to release this operation press the EMERGENCY OPERATION switch twice or once or press any button on the remote controller 0 NY 7 2 PERFORMANCE CURVE Cooling Cooling capacity at Rated frequency g 1 5 5 S Lag Indoor intake air Wet bulb 9 temperature F 1 2 4 SE 22842 mc 76 26 911 str 75 EDS S 1 0 8 909 72 g 68 64 14 23 32 41 50 59 68 77 86 95 104 113 Outdoor intake air Dry bulb temperature F MUZ FE09NA MUZ FE12NA SHF at rating condition 0 76 SHF at rating condition 0 73 Airflow 307 Airflow 350 S 08 s 13 a 8 12 5 0 7 5 141 5 8 10 5 0 6 5 09 5 5 osp gs 05 ws 07 o 65 78 85 95 105 715 65 75 85 95 105 115 Outdoor intake air DB temperat
24. Changes for the Better MITSUBISHI Revision A ELECTRIC _ SPLIT TYPE AIR CONDITIONERS OUTDOOR UNIT SERVICE MANUAL R410A Models MUZ FE09NA MUZ FE12NA MUZ FE18NA Indoor unit service manual MSZ FE NA Series OBH542 CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND 2 3 SPECIFICATION sassuauahasassusuasauSRRERSANRARRERARARRRRERSUSEE 3 4 OUTLINES AND DIMENSIONS 5 5 WIRING DIAGRAM 6 6 REFRIGERANT SYSTEM DIAGRAM 7 7 9 8 ACTUATOR CONTROL 16 9 SERVICE FUNCTIONS 17 10 TROUBLESHOOTING eee 17 11 DISASSEMBLY INSTRUCTIONS 36 D PARTS CATALOG OBB543 MUZ FEOONA MUZ FE12NA S RoHS compliant products have lt gt mark on the spec name plate Revision A MUZ FE18NA has been added 1 TECHNICAL CHANGES MUZ FE09NA MUZ FE12NA MUZ FE18NA 1 New model 2 PART NAMES AND FUNCTIONS MUZ FE09NA MUZ FE12NA Airinlet back and side Drain hose Airoutlet Drain outlet Airinlet back and side
25. F 2 o 165 Indoor DB temperature 8 420 g 160 2 9 155 8 380 5 150 80 145 340 9 140 75 135 300 130 70 125 260 120 6870 75 80 85 90 95 100 105 F 6870 75 80 85 90 95 100 105 F Outdoor ambient temperature Outdoor ambient temperature MUZ FE18NA PSIG 480 440 PSIG o 190 86 2 400 180 80 a o 170 2 360 2 160 75 5 3 9 amp 150 70 5 320 5 140 5 Indoor DB temperature CF 280 130 120 240 6870 75 80 85 90 95 100 105 F 6870 75 80 85 90 95 100 105 F Outdoor ambient temperature Outdoor ambient temperature 12 Heating Data is based on the condition of outdoor humidity 7596 Air flow should be set to High speed Data is for heating operation without any frost
26. F 25 C x1 x1 Regardless of normal or abnormal condition 2 short beeps are emitted as the signal is received Y Does POWER lamp MSZ FE09 12NA the up per lamp of OPERATION INDICATOR lamp MSZ FE18NA on the indoor unit blink at the interval of 0 5 seconds Blinks The outdoor unit is abnormal Beep is emitted N at the same timing as the blinking of POWER 9 lamp MSZ FE09 12NA the upper lamp of OFF OPERATION INDICATOR lamp MSZ FE 18NA X2 Yes Blinks The outdoor unit is abnormal Check the blinking pattern and confirm the abnormal point with the out The outdoor unit is normal door unit failure mode table 10 2 3 Make sure to check at least two consecutive blinking cycles X2 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 Release the failure mode recall function accord Press RESET button of the remote controller ing to the left mentioned procedure Y Repair the defective parts Deleting the memorized abnormal condition After repairing the unit recall the failure mode again according to Setting up the failure mode recall function 10 2 1 Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 9 Press EMER
27. GENCY OPERATION switch so that the memorized abnormal condition is deleted 2 Release the failure mode recall function according to Releasing the failure mode recall function men tioned above NOTE 1 Make sure to release the failure mode recall function once it is set up otherwise the unit cannot operate properly 2 If the abnormal condition is not deleted from the memory the last abnormal condition is kept memorized X2 Blinking pattern when outdoor unit is abnormal Blinking at 0 5 Blinking at 0 5 2 5 second OFF 3 second ON second interval 2 5 second OFF 3 second ON second interval E ie E e Meu uua I at uy OFF 14 51 4 4 gt 4 4 j Beeps i No bee Repeated cycle Repeated cycle Repeated cycle 19 3 Outdoor unit failure mode table Indoor unit Abnormal point Failure mode protection LED indication Outdoor P C board Condition Indoor outdoor unit failure mode recall function Outdoor unit failure mode recall function OFF None Normal 2 time flash 2 5 seconds OFF Outdoor power system Overcurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started Reconnect connectors Refer to 10 5 How to check inverter compressor eCheck stop valve 3 time flash 2 5 seconds OFF Discharge temperature thermistor Defrost thermisto
28. T cine rs gna e M 5 dre pO EU NI a 38 dd We sitio uy Front side of unit Fin temperature thermistor RT64 CN642 Ambient temperature thermistor RT65 Defrost thermistor 61 641 Output to drive outdoor fan motor CN932 CN643 Outdoor heat exchanger temperature thermistor RT68 CN644 Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 600 x 2 c 8 500 5 9 3 9 400 vo iv 8 2 300 vo 200 100 50 Temperature F 68 86 104 34 LED Discharge temperature thermistor RT62 CN641 WEISEEHEKREEHE SEBEHEBEEESSEE AE E El ERCSPREHEBEE eee Se MIENNE BL 02 50 68 86 104 122 140 158 176 194 212 230 248 Temperature F LEV connector changing defrost CN724 Jumper wire for pre heat control setting JK Jumper wire for setting JS Fin temperature thermistor RT64 RE ET RE 8 0 32 50 68 86 104 122 140 158 176 Temperature F d MUZ FE18NA Fuse F62 Fuse F601 R V coil CN602 T2 0AL250V T3 15AL250V 208 230 VAC 9 Jumper wire for changing defrost setting JS Jumper wire for pre heat
29. ake air WB temperature F MUZ FE18NA Airflow 738 CFM 1 6 SS 65 1 4 12 vem 1 0 se i d x Total power consumption 15 5 5 15 25 35 45 55 65 Outdoor intake air WB temperature F This value of frequency is not the same as the actual frequency in operating Refer to 7 5 and 7 6 for the relationships between frequency and capacity 11 7 3 CONDENSING PRESSURE Cooling Data is based on the condition of indoor humidity 50 96 Air flow should be set to High speed MUZ FE09NA PSIG 580 540 PSIG 2 500 75 F 460 170 indoor DB tem erature F 86 E 88 5165 420 2160 3 ave S 8 155 SS 8 380 ww 2150 92 5 145 E eiue p G 340 we 5 140 135 70 300 130 125 260 120 6870 75 80 85 90 95 100 105 F 6870 75 80 85 90 95 100 105 F Outdoor ambient temperature Outdoor ambient temperature MUZ FE12NA PSIG 580 540 g PSIG 2 500 180 9 175 c 460 170 o
30. anel Screw of the R V coil OPERATING PROCEDURE PHOTOS 4 Removing the discharge temperature thermistor Photo 6 defrost thermistor outdoor heat exchanger tempera Outdoor heat Ambient tem ture thermistor and ambient temperature thermistor exchanger tempera perature 1 Remove the cabinet and panels Refer to 1 ture thermistor thermistor 2 Disconnect the lead wire to the reactor and the following connectors Inverter P C board CN671 Defrost thermistor discharge temperature thermis tor and outdoor heart exchanger temperature ther mistor CN672 Ambient temperature thermistor 3 Pull out the discharge temperature thermistor from its holder Photo 8 4 Pull out the defrost thermistor from its holder 5 Pull out the outdoor heat exchanger temperature thermistor from its holder 6 Pull out the ambient temperature thermistor from its holder 5 Removing outdoor fan motor 1 Remove the top panel cabinet and service panel Refer to 1 2 Disconnect the following connectors Photo 7 Inverter P C board CN931 and CN932 Fan motor 3 Remove the propeller 4 Remove the screws fixing the fan motor 5 Remove the fan motor P eomm 1 Screws of the outdoor fan motor 6 Removing the compressor and 4 way valve Photo 8 1 Remove the top panel cabinet and service panel Refer to 1 Brazed part of the Discharge temperature 2 Remove the back panel Refer to 1 discharge pipe the
31. control setting JK Signal of out Defrost thermistor door fan motor CN931 671 Discharge temperature thermistor RT62 CN671 Outdoor heat exchanger temperature thermistor LED RT68 CN671 Output to Ambient temperature drive outdoor thermistor RT65 fan motor CN672 CN932 Fin temperature thermistor RT64 Fuse F901 CN673 T3 15AL250V alle Fuse F880 T3 15AL250V LEV connector 724 allele o o o o o o 000000
32. e 56 55 56 Fan speed High 1 020 1 120 1 300 Airflow High 307 Wet 350 Wet 634 Wet Outdoor unit 95 95 95 Intake air temperature Fan speed Airflow 14 7 5 CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 1 5 1 5 2 0 9 o 25 9 g 3 0 5 8 S S 5 510 810 5 5 8 5 520 5 D 1 o 8 9 g o el o S 20s 8 05 o 5 0 Se HA 5 5 1 0 5 9 a G o m 150 Hz 100 150 Hz 0 50 100 150 Hz 50 100 150 Hz Th operational frequency of compressor The frequency of compressor operational frequency of compressor The operational frequency of compressor Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 1 5 1 5 1 5 2 5 o o 2 p o o o o 5 5 5 6 2 0 pz 9 5 519 10 5 1 0 S E 5 9 5 6 1 0 05 9 05 05 9 5 5 205 EE 10 150 Hz 50 100 150 Hz 0 50 100 150 Hz 0 50 100 150 Hz The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor Correction of Cooling capacity Correction of Co
33. e Photo 2 Screws of the Jback panel top panel Screws of the back panel Screws of the service panel Screws of the cabinet Screw of the valve cover Screws of the back panel Screws of the back panel Photo 1 Screws of the top panel Screws of the cabinet Scr ws of the cabinet Photo 3 Screws of the conduit cover 777 Conduit plate OPERATING PROCEDURE PHOTOS 2 Removing the inverter assembly inverter P C board 1 Remove the cabinet and panels Refer to 1 2 Disconnect the lead wire to the reactor and the following con nectors Inverter P C board CN602 R V coil CN931 CN932 Fan motor CN671 Defrost thermistor discharge temperature thermistor and outdoor heat exchanger temperature thermistor CN672 Ambient temperature thermistor CN724 LEV 3 Remove the compressor connector 4 Remove the screws fixing the relay panel 5 Remove the relay panel 6 Remove the earth wires and the lead wires of the inverter P C board 7 Remove the screw of the PB support 8 Remove the inverter P C board from the relay panel 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Disconnect the following connector Inverter P C board CN602 R V coil 3 Remove the R V coil 40 Photo 4 Screw of the relay panel Screws of the Inverter P C board Earth wires PB support Screws of the PB support Screws of the relay p
34. easurement point at 3 points BLK U WHT V Measure AC voltage between the lead wires at 3 points BLK U RED W WHT V RED W NOTE 1 Output voltage varies according to power supply voltage 2 Measure the voltage by analog type tester 3 During this check LED of the inverter P C board flashes 9 times Refer to 10 6 1 O Check of compressor to 10 5 Check of compressor winding y No Replace the compressor Is the compressor normal Yes Refer to 10 5 Check of compressor operation time No Refer to 10 5 Check of compressor start failure Does the compressor operate continuously Yes 24 244444002 Check of compressor winding e Disconnect the connector between the compressor and intelligent power module and measure the resistance between the compressor terminals Measurement point at 3 points BLK WHT BLK RED Measure the resistance between the lead wires at 3 points WHT RED lt lt Judgement gt gt Refer to 10 4 O Q vere Abnormal short Infinite Abnormal open NOTE Be sure to zero the ohmmeter before measurement E Check of compressor operation time lt lt Judgement gt gt e Connect the compressor and activate the inverter Then measure 0 second the time until the inverter stops due to over current lt lt Operation method gt gt 1 second W EN al
35. eat exchanger temperature Stop valve N thermistor 7 with service port Outdoor RT68 Flared connection Discharge temperature ll thermistor Ambient temperature thermistor RT65 Capillary tube O D 0 118 I D 0 071 x 23 5 8 03 0 01 8 600 Strainer Flared connection Expansion 100 Stop valve valve with strainer R V coil m heating ON cooling OFF Capillary tube Refrigerant pipe 21 4 O D 0 118 x I D 0 079x 9 7 16 with heat insulator 03 0 x 02 0 x 240 Refrigerant flow in cooling gt Refrigerant flow in heating MUZ FE18NA Refrigerant pipe 25 8 with heat insulator 4 way valve Flared connection Service Discharge temperature Service thermistor Defrost thermistor 65 Compressor Outdoor heat exchanger temperature thermistor RT68 T port T Strainer 100 Flared connection LEV Strainer 100 R V coil heating ON cooling OFF Stop valve Capillary tube 0 157 1 0 0 094x 3 15 16 Refrigerant pipe 03 8 24 0 02 4 100 Refrigerant flow coolin with heat insulator 9 9 gt Refrigerant flow heating REFRIGERANT LENGTH and HEIGHT DIFFERENCE Refrigerant piping ft Piping size O D in Model Max Length Max Height difference A B 65 40 1 4
36. emote controller at the same time press RESET button First release RESET button remote controller is displayed after 3 seconds While pressing both OPERATION SELECT button and TOO COOL button on the And release the other two buttons after all LCD in operation display section of the Y Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 1 a MITSUBISHI ELECTRIC MITSUBISHI ELECTRIC y Does POWER lamp MSZ FE09 12NA the upper lamp of OPERATION INDICATOR lamp MSZ FE18NA on the indoor unit blink at the interval of 0 5 seconds Blinks Either indoor or outdoor unit is abnormal Beep is emitted at the same timing as the blinking of POWER lamp MSZ FE09 12NA the upper lamp of OPERATION INDICATOR lamp MSZ FE18NA 2 Yes Judgment of indoor outdoor abnormality w Blinks Before blinking does POWER lamp MSZ FE09 12NA the upper lamp of OPERATION INDICATOR lamp MSZ FE18NA stay ON for 3 seconds Stays ON for 3 seconds without beep The outdoor unit is abnormal i o Indoor unit is normal But the outdoor unit might be abnormal because there are some abnor malities that can not be recalled with this way Confirm if outdoor unit is abnormal according to the detailed outdoor condition a short beep is emitted No OFF unit failure mode recall function
37. en the terminal pins of the connector although no signal is being transmitted to coil Check if CN721 MUZ FE09 12NA CN602 MUZ FE18NA is connected Unit operates COOL mode even if it is set to HEAT mode Disconnect connector between the compressor and the intelligent Is there 208 230 VAC between CN721 MUZ power module FE09 12NA CN602 MUZ FE18NA O and Replace the inverter Turn ON the power supply and on the inverter P C board 3 minutes after the P C board press EMERGENCY OPERATION power supply is turned ON Switch twice HEAT mode ee Replace the 4 way valve Unit operates HEAT mode even if it is set to COOL mode Disconnect connector between the compressor and the intelligent Is there 208 230 VAC between 721 MUZ power module FE09 12NA CN602 MUZ FE18NA and Replace the inverter Turn ON the power supply and on the inverter P C board 3 minutes after the Yes P C board press EMERGENCY OPERATION power supply is turned ON switch once COOL mode Replace the 4 way valve 26 D Check of outdoor fan motor MUZ FE09NA MUZ FE12NA Disconnect CN932 from the inverter P C board and measure the resistance of the outdoor fan motor Is the outdoor fan motor normal CE to 10 4 No Replace the outdoor fan motor Yes Replace the inverter P C board MUZ FE18NA Disconnect the connectors CN931 and CN932 from the in
38. er Photo 7 5 Remove the screws fixing the fan motor Photo 7 6 Remove the fan motor Removing the compressor and 4 way valve 1 Remove the cabinet and panels Refer to 1 2 Remove the inverter assembly Refer to 2 3 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG 4 Detach the brazed part of the suction and the discharge pipes connected with compressor 5 Remove the nuts of compressor legs 6 Remove the compressor 7 Detach the brazed part of pipes connected with 4 way valve Photo 8 Photo 8 Brazed parts of 4 way valve 38 Photo 6 Outdoor heat exchanger tempera ture thermistor Defrost thermistor Photo 7 Screws of the outdoor fan motor Propeller Propeller nut 247 11 2 MUZ FE18NA OPERATING PROCEDURE NOTE Turn OFF power supply before disassembling PHOTOS Removing the cabinet 1 Remove the screws of the service panel 2 Remove the screws of the top panel 3 Remove the screw of the valve cover 4 Remove the service panel 5 Remove the screws fixing the conduit cover Photo 3 6 Remove the conduit cover Photo 3 7 Remove the top panel 8 Remove the valve cover 9 Disconnect the power supply and indoor outdoor con necting wire 10 Remove the screws of the cabinet 11 Remove the cabinet 12 Remove the screws of the back panel 13 Remove the back panel Screws of th
39. everse cycle W 31 1 2 33 1 16 Dimensions D 11 1 4 13 H 21 5 8 34 5 8 Weight 80 119 External finish Munsell 3Y 7 8 1 1 Remote controller Wireless type Control voltage by built in transformer 12 24 Refrigerant piping Not supplied Refrigerant pipe size Liquid 1 4 0 0315 3 8 0 0315 Min wall thickness Gas 3 8 0 0315 5 8 0 0315 Connection method ioco Flared Flared Outdoor Flared Flared Between the indoor Height difference 40 50 amp outdoor units Piping length 65 100 Refrigerant charge R410A NOTE Test conditions are based on AHRI 210 240 3 amp 1 Rating conditions Cooling Indoor 80 FDB 67 FWB Outdoor 95 FDB 75 FWB Heating Indoor 70 FDB 60 FWB Outdoor 47 FDB 43 FWB x2 Heating Indoor 70 FDB 60 FWB Outdoor 17 FDB 15 FWB 2 Ib 9 oz 4 Ib 3 oz Rated frequency Rated frequency Maximum frequency Test condition X344 Indoor air condition F Outdoor air condition F Test e Dry bulb Wet bulb Dry bulb Wet bulb A 2 Cooling Steady State at rated compressor Speed B 2 Cooling Steady State at rated compressor Speed 80 67 95 75 80 67 82 65 SEER 1 Cooling Steady State Cooling at minimum compressor Speed 80 67 82 65 F 1 Cooling Steady State at minimum comp
40. ling Heating Cooling Heating Capacity 9 000 10 900 12 000 13 600 18 000 21 600 SHF 0 76 0 73 0 84 Input 0 580 0 710 0 930 0 950 1 800 2 200 Rated frequency 34 42 51 52 5 50 5 62 5 Indoor unit MSZ FE09NA MSZ FE12NA MSZ FE18NA Power supply 208 230 1 60 Input 0 018 0 024 0 024 0 030 0 058 0 19 0 17 0 25 0 23 MUZ FE09NA 0 25 0 23 0 32 0 29 MUZ FE12NA 0 56 0 51 MUZ FE18NA Fan motor current Outdoor unit Electrical circuit Power supply 208 230 1 60 Input 0 562 0 686 0 906 0 920 1 212 1 482 Comp current 2 38 2 15 2 98 2 70 4 05 3 66 4 12 3 72 4 47 4 04 5 72 5 17 Fan motor current 0 35 0 32 1 16 1 05 1 13 1 02 Refrigerant circuit Condensing pressure 376 355 402 392 373 357 Suction pressure 154 108 148 104 151 107 Discharge temperature 142 145 160 158 150 159 Condensing temperature 112 108 117 115 111 105 Suction temperature 53 36 53 34 58 41 Comp shell bottom temperature 144 128 146 129 132 136 Ref pipe length Refrigerant charge R410A Indoor unit 80 80 80 Intake air temperature 67 67 67 59 58 59 Discharge air temperatur
41. ng OPERATING PROCEDURE PHOTOS 1 Removing the cabinet Photo 1 1 Remove the screw fixing the service panel Photo 1 2 Pull down the service panel and remove it Photo 1 3 Remove the screws fixing the conduit cover Photo 2 Screws Screw of the 4 Remove the conduit cover Photo 2 ofthe top Screws of 5 Disconnect the power supply wire and indoor outdoor the top panel connecting wire 6 Remove the screws fixing the top panel Photo 1 7 Remove the top panel Photo 1 8 Remove the screws fixing the cabinet 9 Remove the cabinet 10 Remove the screws fixing the back panel 11 Remove the back panel Screw of the conduit cover Screws of Service the cabinet panel Conduit cover L Conduit plate OPERATING PROCEDURE PHOTOS 2 Removing the inverter assembly inverter P C board 1 Remove the cabinet and panels Refer to 1 2 Disconnect the lead wire to the reactor and the following connectors Inverter P C board 721 R V coil CN932 Fan motor CN641 Defrost thermistor and discharge temperature ther mistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor CN724 LEV 3 Remove the compressor connector CN61 4 Remove the screws fixing the relay panel Photo 3 5 Remove the inverter assembly Photo 4 6 Remove the screw of the ground wire and screw of the T B suppo
42. oling total input Correction of Heating capacity Correction of Heating total input 1 5 2 1 5 2 0 o 2 8 2 9 9 5 Oo 5 51 5 1 0 amp 5 1 0 S c 3 9 2 3 1 0 o S 05 8 Bos 9 ben 20 5 c c 150 Hz 0 50 100 150 Hz 0 50 100 150 Hz 0 50 100 150 Hz The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor 7 6 HOW TO OPERATE FIXED FREQUENCY OPERATION Test run operation 1 Press EMERGENCY OPERATION switch to start COOL or HEAT mode COOL Press once HEAT Press twice 2 Test run operation starts and continues to operate for 30 minutes 3 Compressor operates at rated frequency in COOL mode or 58 Hz in HEAT mode 4 Indoor fan operates at High speed 5 After 30 minutes test run operation finishes and EMERGENCY OPERATION starts operation frequency of compressor var ies 6 To cancel test run operation EMERGENCY OPERATION press EMERGENCY OPERATION switch or any button on remote controller 15 8 ACTUATOR CONTROL MUZ FE09NA MUZ FE12NA MUZ FE18NA 8 1 OUTDOOR FAN MOTOR CONTROL The fan motor turns ON OFF interlocking with the compressor ON The fan motor turns ON 5 seconds before the compressor starts up OFF The fan motor turns OFF 15 seconds after the compressor has stopped running 5 seconds 15 seconds ON
43. protec tion will be activated in the following cases 1 Instantaneous power voltage drop Short time power failure 2 When the power supply voltage is high 9 time flash 2 5 seconds OFF Inverter check mode The connector of compressor is disconnected inverter check mode starts 22 Check if the connector of the com pressor is correctly connected Refer to 10 5 How to check inverter compressor 10 4 TROUBLE CRITERION OF MAIN PARTS MUZ FE09NA MUZ FE12NA MUZ FE18NA Part name Check method and criterion Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat ex changer temperature thermistor RT68 Measure the resistance with a tester Refer to 10 6 Test point diagram and voltage 1 Inverter P C board the chart of thermistor Discharge tem perature thermistor RT62 Fin temperature thermistor RT64 Measure the resistance with a tester Before measurement hold the thermistor with your hands to warm it up Refer to 10 6 Test point diagram and voltage 1 Inverter P C board the chart of thermistor Compressor Measure the resistance between terminals using a tester Winding temperature 4 104 F 20 40 C Normal MUZ FE09 12NA MUZ FE18NA 1 52 2 17 Q 0 83 1 18 Q Outdoor fan motor Measure the resistance between lead wires using a tester Part temperature
44. protection Temperature of discharge temperature thermistor exceeds 232 F 111 C compressor frequency lowers NOTE 1 The location of LED is illustrated at the right figure Refer to 10 6 1 2 LED is lighted during normal operation The flashing frequency shows the number of times the LED blinks after every 2 5 second OFF Flashing Example When the flashing frequency is 2 2 5 second OFF 0 5 second ON m 0 5 second ON 21 Check refrigerant circuit and refrig erant amount Refer to 10 5 Check of LEV Refer to 10 5 Check of outdoor thermistors Inverter P C board Parts side MUZ FE09 LED M2NA Flashing MUZ FE 18NA LED Symptom LED indication Abnormal point Con dition Condition Remedy Outdoor unit operates 7 time flash 2 5 seconds OFF Low discharge tem perature protection Temperature of discharge temperature thermistor has been 122 F 50 or less for 20 minutes Refer to 10 5 Check of LEV Check refrigerant circuit and refrig erant amount 8 time flash 2 5 seconds OFF MUZ FE09 12NA PAM protection PAM Pulse Ampli tude Modulation The overcurrent flows into IGBT Insulated Gate Bipolar tran sistor TR821 or the bus bar voltage reaches 320 V or more PAM stops and restarts MUZ FE18NA Zero cross detect ing circuit Zero cross signal for PAM control cannot be detected This is not malfunction PAM
45. r 1 time flash every 2 5 seconds Fin temperature thermistor 3 time flash 2 5 seconds OFF P C board temperature thermistor 4 time flash 2 5 seconds OFF Ambient temperature thermistor 2 time flash 2 5 seconds OFF Thermistor shorts or opens during compressor running Refer to 10 5 Check of outdoor thermistors Defective outdoor thermistors can be identified by checking the blinking pattern of LED Overcurrent 11 time flash 2 5 seconds OFF Large current flows into intelligent power module Reconnect compressor connector Refer to 10 5 How to check inverter compressor Check stop valve Compressor synchronous abnormality Compressor start up failure protection 12 time flash 2 5 seconds OFF Waveform of compressor current is distorted Reconnect compressor connector Refer to 10 5 How to check inverter compressor Discharge temperature Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if discharge temperature thermistor reads 212 F 100 C or less 3 minutes later refrigerant circuit and refrigerant amount Refer to 10 5 Check of LEV High pressure Temperature of indoor coil thermistor exceeds 158 F 70 C in HEAT mode Temperature of defrost thermistor exceeds 158 F 70 C in COOL mode Check refrigerant circuit and refrigerant amount
46. r Start heating or cooling operation by pressing EMERGENCY C indi hort OPERATION switch on the indoor unit ompressor winding shor TEST RUN OPERATION Refer to 7 6 Coane lt lt Measurement gt gt Sanne defect Measure the time from the start of compressor to the stop of compressor due to overcurrent Abnormal 10 seconds Abnormal Refrigerant circuit defect Closed valve 10 minutes E Check of compressor start failure Confirm that 1 4 is normal Electrical circuit check 1 Contact of the compressor connector 2 Output voltage of inverter P C board and balance of them See 10 5 3 Direct current voltage between DB61 and MUZ FE09 12NA JP715 and JP30 MUZ FE18NA on the inverter P C board V 4 Voltage between outdoor terminal block 51 52 Does the compressor run for 10 seconds or Check the refrigerant circuit more after it starts Yes Check the stop valve After the compressor is heated with a drier does the compressor start x1 No Replace the compressor x1 Yes aN Heat the compressor with drier for about 20 minutes Do not recover refrigerant Refer to 9 2 PRE HEAT CONTROL SETTING gas while heating Compressor start failure Activate pre heat control Heating part Check of outdoor thermistors Disconnect the connector of
47. ressor Speed E V Cooling Steady State at Intermediate compressor Speed 3 amp 5 H1 2 Heating Steady State at rated compressor Speed H3 2 Heating at rated compressor Speed HSPF 0 1 Heating Steady State Heating at minimum compressor Speed H1 1 Heating Steady State at minimum compressor Speed H2 V Heating at Intermediate compressor Speed 2 amp 5 80 67 67 53 5 80 67 87 69 70 60 47 43 70 60 17 15 70 60 62 70 60 47 70 60 35 3 amp 5 At Intermediate compressor Speed Cooling rated compressor speed minimum compressor speed 3 minimum compressor speed OPERATING RANGE 1 POWER SUPPLY Rated voltage Guaranteed voltage V 208 230 V Min 187 208 230 253 Outdoor unit 1 phase 60 Hz 2 OPERATION Intake air temperature F Condition Indoor Outdoor WB DB Standard temperature 67 95 Maximum temperature 73 Minimum temperature 57 14 Maximum humidity Standard temperature 60 47 Heating Maximum temperature 67 75 Minimum temperature 60 Cooling Unit inch Basically open 4 inch or more REQUIRED SPACE OUTLINES AND DIMENSIONS 4 MUZ FE09NA MUZ FE12NA without any obstruction in front and on both sides of the unit Drain hole 1 5 8 Open two sides of left right or rear side 1 4 flared 13 8 flared Service panel Liquid pipe
48. rmistor 3 Remove the inverter assembly Refer to 2 4 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 kg cm 0 MPa 5 Detach the brazed part of the suction and the discharge pipes connected with compressor 6 Remove the compressor nuts 7 Remove the compressor 8 Detach the brazed parts of 4 way valve and pipes Photo 5 Brazed part of the suction pipe 42 43 s MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2009 MITSUBISHI ELECTRIC CO LTD Distributed in Sep 2010 No OBH543 REVISED EDITION A 5 New publication effective Sep 2010 Distributed in Jul 2009 No OBH543 5 De Made in Japan Specifications subject to change without notice
49. rt Photo 4 7 Remove the inverter P C board from the inverter assembly Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Remove the R V coil Photo 5 Removing the discharge temperature thermistor defrost thermistor outdoor heat exchanger tempera ture thermistor and ambient temperature thermistor 1 Remove the cabinet and panels Refer to 1 2 Disconnect the lead wire to the reactor and the following connectors Inverter P C board CN721 R V coil CN932 Fan motor CN641 Defrost thermistor and discharge temperature ther mistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor 3 Pull out the discharge temperature thermistor from its hold er Photo 5 4 Pull out the defrost thermistor from its holder Photo 6 5 Pull out the outdoor heat exchanger temperature thermistor from its holder Photo 6 6 Pull out the ambient temperature thermistor from its holder 37 Photo 3 Screws of the relay panel Photo 4 Inverter assembly Inverter P C board Screw of the T B support Heat sink T B support Screw of the ground wire Photo 5 coil Discharge temperature thermistor OPERATING PROCEDURE PHOTOS 5 Removing outdoor fan motor 1 Remove the cabinet and panels Refer to 1 2 Disconnect the connectors for outdoor fan motor 3 Remove the propeller nut Photo 7 4 Remove the propell
50. sh 2 5 seconds OFF DC voltage of inverter cannot be detected normally Each phase current of compressor 9 time flash 2 5 seconds OFF Each phase current of compressor cannot be detected normally Refer to 10 5 How to check inverter compressor 12 time flash 2 5 seconds OFF Overcurrent Compressor open phase 10 time flash 2 5 seconds OFF Large current flows into intelligent power module IPM The open phase operation of compressor is detected The interphase short circuit occurs in the output of the intelligent power module IPM The compressor winding shorts circuit Reconnect compressor connector Refer to 10 5 How to check inverter compressor 14 time flash 2 5 seconds OFF Stop valve Closed valve 14 time flash 2 5 seconds OFF Closed valve is detected by compressor current Check stop valve NOTE Blinking patterns of this mode differ from the ones of Troubleshooting check table 10 3 OPERATION INDICATOR POWER lamp MSZ FE09 12NA Upper lamp MSZ FE18NA 20 10 3 TROUBLESHOOTING CHECK TABLE Symptom LED indication Abnormal point Con dition Condition Remedy Outdoor unit does not oper ate 1 time flash every 2 5 seconds Outdoor power sys tem Overcurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started or failure of restart of compressor has repeated 24
51. thermistor in the outdoor P C board see below table and measure the resistance of thermistor Y Is the thermistor normal Refer to 10 6 1 YE 2 2 Rohs Yes Y Reconnect the connector of thermistor Turn ON the power supply and press EMERGENCY OPERATION switch Y Does the unit operate for 10 minutes or more showing thermistor abnormality D Replace the inverter board yres OK Cause is poor contact MUZ FE09NA MUZ FE12NA Thermistor Connector Pin No Defrost Between 641 pin1 and pin2 Discharge temperature Between CN641 pin3 and pin4 Fin temperature Between CN642 1 and 2 Inverter P C board Ambient temperature Between CN643 pin1 and pin2 Outdoor heat exchanger temperature Between CN644 1 pin3 MUZ FE18NA Thermistor Connector Pin No Defrost Between 671 1 and pin2 Discharge temperature Between 671 pin3 pin4 Fin temperature Between 673 1 and 2 Inverter P C board Ambient temperature Between CN672 pin1 and pin2 Outdoor heat exchanger temperature Between CN671 5 Check of R V coil First of all measure the resistance of R V coil to check if the coil is defective Refer to 10 4 In case CN721 MUZ FE09 12NA CN602 MUZ FE18NA is disconnected or coil is open voltage is generated betwe
52. times Reconnect connector of compres sor Refer to 10 5 How to check in verter compressor Check stop valve Outdoor thermistors Discharge temperature thermistor fin temperature thermistor defrost thermistor outdoor heat exchanger temperature ther mistor P C board temperature thermistor or ambient tempera ture thermistor shorts or opens during compressor running Refer to 10 5 Check of outdoor thermistors Outdoor control sys tem Nonvolatile memory data cannot be read properly POWER lamp MSZ FE09 12NA the upper lamp of OPERA TION INDICATOR lamp MSZ FE18NA of the indoor unit lights up or flashes 7 times Replace inverter P C board 6 time flash 2 5 seconds OFF Serial signal The communication fails between the indoor and outdoor unit for 3 minutes Refer to 10 5 How to check miswiring and serial signal error 11 time flash 2 5 seconds OFF Stop valve Closed valve Closed valve is detected by compressor current Check stop valve 14 time flash 2 5 seconds OFF Outdoor unit Other abnormality Outdoor unit is defective Refer to 10 2 2 Flow chart of the detailed outdoor unit failure mode recall function Outdoor unit stops and restarts 3 min utes later is repeated 2 time flash 2 5 seconds OFF Overcurrent protec tion Large current flows into intelligent power module MUZ FE09 12NA When overcurrent protection occ
53. tors CN931 CN932 of the outdoor fan motor If the connection is poor make it correct x Only for MUZ FE18NA Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the in Check the remedy following LED verter P C board No indication Does the LED flash 10 times Refer to 10 3 Yes 10 time flash Replace the inverter P C board Ri 31 How to check miswiring and serial signal error Turn OFF the power supply D Y lt Is there rated voltage in the power supply y Yes Turn ON the power supply Check the power supply Is there rated voltage between outdoor terminal block S1 and S2 No Check the wiring yres Press EMERGENCY OPERATION switch once Does the OPERATION INDICATOR lamp light up lt Confirmation of the power to the indoor unit gt No Y Yes Een Y Is there any miswiring 12 122 D poor contact or wire re signal error indicated 6 minutes No disconnection of the Yes Correct them indoor outdoor connect Yes ing wire No lt y X1 Miswiring may damage indoor electronic control P C Y board during the operation Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Short circuit outdoor terminal block S2 tion starts x3 and S3
54. ure F Outdoor intake air DB temperature F MUZ FE18NA SHF at rating condition 0 84 Airflow 634 1 5 71 a 14 67 63 13 85 12 aure OF er 11 Ac WB temp 10 indoor intake S ub 0 5 70 75 80 85 90 95 100 105 110 115 Outdoor intake air DB temperature F This value of frequency is not the same as the actual frequency in operating Refer to 7 5 and 7 6 for the relationships between frequency and capacity 10 Heating Heating capacity at Rated frequency 1 3 59 1 2 e 79 1 1 e 51 0 5 0 9 0 8 8 507 9 0 6 S 0 5 59 0 4 actor 2 2 IN E difference F NN Indoor air Dry bulb temperature 4 5 14 23 32 41 50 59 Outdoor intake air Wet bulb temperature F MUZ FE09NA MUZ FE12NA 0 9 Airflow 381 CFM Airflow 420 CFM 75 0 8 70 0 7 63 0 6 0 5 0 4 0 3 nds 0 2 0 1 0 ption eee pe M wer consum Total Total power consumption kW 15 5 5 15 25 35 45 55 65 Outdoor intake air WB temperature F 15 5 5 15 25 35 45 55 65 Outdoor int
55. urs within 10 seconds after compressor starts compressor restarts after 15 seconds Reconnect connector of compres sor Refer to 10 5 How to check in verter compressor Check stop valve 3 time flash 2 5 seconds OFF Discharge tempera ture overheat protec tion Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if dis charge temperature thermistor reads 212 F 100 C or less 3 minutes later Check refrigerant circuit and refrig erant amount Refer to 10 5 9 Check of LEV 4 time flash 2 5 seconds OFF Fin temperature board tem perature thermistor overheat protection Temperature of fin temperature thermistor on the heat sink exceeds 167 176 F 75 80 C or temperature of P C board temperature thermistor on the inverter P C board exceeds 158 167 F 70 75 C Check around outdoor unit Check outdoor unit air passage Refer to 10 5 Check of outdoor fan motor 5 time flash 2 5 seconds OFF High pressure pro tection Temperature of indoor coil thermistor exceeds 158 F 70 C in HEAT mode Temperature of outdoor heat exchanger tempera ture thermistor exceeds 158 F 70 C in COOL mode Check refrigerant circuit and refrig erant amount Check stop valve 8 time flash 2 5 seconds OFF Compressor syn chronous abnormal ity The waveform of compressor current is distorted
56. verter P C board Check the connection between the connector CN931 and CN932 Is the resistance between each ter minal of outdoor fan motor normal Refer to 10 4 155 Y No Disconnect CN932 from the inverter P C board and turn on the power supply Y Rotate the outdoor fan motor manually and measure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Y Fixed to either 5 or 0 VDC Does the voltage between each terminal become 5 and 0 N VDC repeatedly Yes Y E No Does the outdoor fan motor rotate smoothly Yes Y Replace the outdoor fan motor Replace the inverter P C board 27 J Check of power supply MUZ FE09NA MUZ FE12NA Disconnect the connector CN61 between compressor and intelligent power module Turn ON power supply and press Rectify indoor outdoor EMERGENCY OPERATION switch connecting wire Y Yes Is there voltage 208 230 Replace the indoor eT LEES No 4 between the indoor terminal No electronic control P C HIT 5 block 1 and 52 board es y Is there bus bar voltage 260 325 Does LED on the inverter P C VDC between DB61 and DB61 Replace the inverter on the inverter P C board Yes 1 up or flash Refer No P C board Refer to 10 6 1 0 10 6 1 la Check the electric parts in main circuit

Mitsubishi Mr.Slim MSZ-FE09NA Service manual

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