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SERVICE MANUAL

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1. TAB62 MF HS TA 9 TABS3 MS TB2 3 secti BRN 008 230 gt C932 8 588 NE pep N N if 0 E e 56 CN671 CN672 CN673 CN724 BLK is o9 oo 0005 ool o o ooo ooo 7 LDE2 2 2 2 2 6 19 I 5 gt lo 2154 H uo tt t E E RT61 RT62 RT68 RTGS RT64 LEV SYMBOL NAME SYMBOL NAME SYMBOL NAME SYMBOL NAME 3 SMOOTHING CAPACITOR 1 932 168 Module 5 CIRCUIT PROTECTION TBA TERMINAL BLOCK F65 F66 FUSE 6 3AL250V L REACTOR RT61 DEFROST THERMISTOR T801 TRANSFORMER F601 FUSE T3 15AL250V LED LED RT62 DISCHARGE TEMP THERMISTOR X601 RELAY F880 FUSE T3 15AL250V LEV EXPANSION VALVE COIL RT64 FIN TEMP THERMISTOR X602 RELAY F901 FUSE T3 15AL250V C COMPRESSOR RT65 AMBIENT TEMP THERMISTOR X64 RELAY IC700 16BT Module F FAN MOTOR RT68 OUTDOOR HEAT EXCHANGER 2154 REVERSING VALVE COIL IC820 DIODE Module PTC64 CIRCUIT PROTECTION EMP THERMISTOR OTES 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 Terminal block OBH584A MUZ FH15NAH CI
2. 65 70 75 80 85 90 95 100 105 F 65 70 75 80 85 90 95 100 105 F Outdoor ambient temperature Outdoor ambient temperature MUZ FH15NA MUZ FH15NAH PSIG 500 TE PSIG 180 2 400 160 Indoor DB temperature F 86 a o 80 350 3 us w 0 140 70 2 a g 300 e 5 2 250 9 100 200 80 65 70 75 80 85 90 95 100 105 F 65 70 75 80 85 90 95 100 105 F Outdoor ambient temperature Outdoor ambient temperature OBH584A v Heating Data are based on the condition of outdoor humidity 75 Air flow should be set to High speed Data are for heating operation without any frost MUZ FHO9NA MUZ FHO9NAH PSIG 450 PSIG 210 75 190 65 410 70 65 170 g eo 5 ay lt 2 370 150 e ve o SS a 0 ge 2 yd 2 130 es 2 330 8 Pe S 110 e E ix 90 290 58 5Hz 70 58 5Hz 250 50 5 15 25 35 45 55 65 75 F 5 15 25 35 45 55 65 75 F Outdoor ambient temperature Outdoor amb
3. 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 aa the inverter P C Refer to 10 4 4 Pin No Is there about 3 5 VAC between each NOTE Measure the voltage by an analog n 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 it ON again 2 Press RESET button on the remote controller OBH584A vr D Check of inverter P C board Check the outdoor fan motor Refer to 10 5 0 Y T the fuse F901 blown on the in verter P C board Yes No Y Check the connection of the connectors CN931 CN932 of the outdoor fan motor If the connection is poor make it correct Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the in verter P C board No Does the LED flash 10 times Yes 10 time flash Replace the inverter P C board lt Check the corresponding parts following LED indication Refer to 10 3 OBH584A 38
4. 3 4 5 6 Photo 13 Soundproof felt Suction pipe brazed part Discharge pipe Brazed parts of brazed part 4 way valve OBH584A S 11 2 MUZ FH15NA MUZ FH15NAH NOTE Turn OFF power supply before disassembly OPERATING PROCEDURE PHOTOS 1 Removing the cabinet Photo 1 1 Remove the screws of the service panel Screws of the top 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 6 Remove the conduit cover 7 Remove the screw of fixing the conduit plate 8 Remove the conduit plate 9 Remove the top panel 10 Remove the valve cover 11 Disconnect the power supply and indoor outdoor connect ing wire Remove the screws of the cabinet Remove the cabinet Remove the screws of the back panel 2 3 4 5 Remove the back panel 1 1 1 1 Photo 2 Screws of theitop panel Screw of the back panel Screws of the Screws of the Screws of the cabinet cabinet cabinet Photo 3 Screws of the conduit cover Photo 4 Screw of the conduit plate Screws of aN the cabinet s 7 Screw ofthe Screws ofthe Screws of the 4 5 valve cover service panel ack panel OBH584A i OPERATING PROCEDURE PHOTOS 2 Removing the inverter assembly inverter P C board Photo 5 Screw of the and relay P C boar
5. board Disconnect the connectors CN931 UN and CN932 from the inverter P C 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 No Yes Y Disconnect CN932 from the inverter P C board and turn on the power supply Rotate the outdoor fan motor manually and measure the voltage of CN931 Between 1 and 5 Between 2 and 5 Between 3 and 5 Fixed to either 5 VDC No Y Replace the outdoor fan motor OBH584A Y Does the voltage between each terminal become 5 and 0 VDC repeatedly Yes Y Does the outdoor fan motor rotate smoothly Yes Replace the inverter P C board 35 J Check of power supply Disconnect the connector between the compressor and the power module 1C700 MUZ FH09 12 IGBT module IC700 MUZ FH15 Turn ON power supply and press EMERGENCY OPERATION switch Rectify indoor outdoor connecting wire Is there voltage 208 230 VAC Replace the indoor Does the left lamp of the electronic control P C OPERATION INDICATOR lamp on No between the indoor terminal No the indoor unit light up block S1 and S2 board Yes Is there DC voltage 260 370 VDC between DB61 and DB61 MUZ FH09 12 294 370 VDC ps ER MS PC R
6. 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 Max 253 Outdoor unit 1 phase n v 60 Hz 2 OPERATION Intake air temperature F Condition Indoor Outdoor WB DB Standard temperature 67 95 Maximum temperature 73 115 Minimum temperature 57 14 Maximum humidity Standard temperature 60 47 Heating Maximum temperature 67 75 Minimum temperature 60 13 Cooling OBH584A 4 OUTLINES AND DIMENSIONS MUZ FHO9NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH Unit inch REQUIRED SPACE 1 4 in 100 mm or more when front and sides of the unit are clear Drain hole 1 21 32 MUZ FH09 12NA Drain hole 1 5 16 MUZ FHO9 12NAH 1 3 4 12 12 3 4 Bolt pitch for installation 2 When any 2 sides of left right and rear of the unit are clear Air out Service panel 718 11 16 Liquid refrigerant pipe joint Refrigerant pipe flared 1 4 e Gas refrigerant pipe joint Refrigerant pipe flared o 3 8 5 11 32 6 23 32 21 5 8 5 29 32 3 27 32 m IND H ne 1 29 32 5 15 16 9 19 11 16 Bolt pitch for installation 3
7. o ol 1i pool3 pooo o AINE cc NOTES Sa Se LE B 1 About the indoor side electric d 3 5 elg F 5 i 12 24V gt wiring refer to the indoor Jte unit electric wiring diagram RUGS 862 8762 768 0 for servicing 208 230v p INDOOR 2 Use copper conductors only MF LEV Si UIT For field wiring naa 3 Symbols indicate I 1 Terminal block SYMBOL NAME SYMBOL NAME SYMBOL NAME C61 C62 SMOOTHING CAPACITOR L61 REACTOR RTGS OUTDOOR HEAT EXCHANGER DB61 DIODE MODULE MC COMPRESSOR TEMP THERMISTOR F701 F801 F901 FUSE T3 15AL250V MF FAN MOTOR TB TERMINAL BLOCK H DEFROST HEATER OPTION PARTS PTC64 PTC65 CIRCUIT PROTECTION T801 TRANSFORMER 1C700 1C820 1950 POWER MODULE RT61 DEFROST THERMISTOR X63 X64 X66 RELAY 1 802 POWER DEVICE RT62 DISCHARGE TEMP THERMISTOR 2194 REVERSING VALVE COIL LED LED RT64 FIN TEMP THERMISTOR 26H HEATER PROTECTOR OPTION PARTS LEV EXPANSION VALVE COIL RT65 AMBIENT TEMP THERMISTOR MUZ FHO9NAH MUZ FH12NAH lel H gt on EL jew 151 BK o 0 T I LD63 RED BK BLK b I I i d F901 FEL m e BK INVER
8. CN724 LEV 3 Remove the compressor connector CN61 4 Remove the screws fixing the heat sink support and the separator b Remove the fixing screws of the terminal block support and the back panel 6 Remove the inverter assembly 7 Remove the screw of the ground wire and screw of the ter minal block support 8 Remove the heat sink support from the P C board support 9 Remove the screw of the inverter P C board and remove the inverter P C board from the P C board support Removing R V coil Photo 7 Screw of the 1 Remove the cabinet and panels Refer to 1 Heat sink Heat sink support Terminal block 2 Disconnect the following connectors P C board pepper Inverter P C board support CN721 R V coil 3 Remove the R V coil Screws of the terminal block support and the back panel Screw of the Screw of the inverter P C board ground wire OBH584A i OPERATING PROCEDURE PHOTOS 4 Removing the discharge temperature thermistor Photo 8 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 con nectors Inverter P C board CN644 Defrost thermistor and discharge temperature ther mistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor 3 Pull out the discharge temperatur
9. F MUZ FH12NAH Airflow 454 CFM 1 0 0 9 0 8 0 7 0 6 Indoor intake 0 5 0 4 air DB temperature Total power consumption kW 5 5 15 25 35 45 55 65 Outdoor intake air WB temperature F MUZ FH15NAH Airflow 497 CFM 1 5 1 3 1 1 Total power consumption KW 0 9 E perature intake air DB tem 0 7 indoor T 0 5 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 OBH584A 16 7 3 CONDENSING PRESSURE Cooling Data are based on the condition of indoor humidity 50 96 Air flow should be set to High speed MUZ FHO9NA MUZ FHO9NAH PSIG 500 490 PSIG o 190 3 400 QUO NS 170 indoor DB temperature a er gt 350 M 3 9 or 150 a E 900 5 130 2 5 250 2 110 200 90 65 70 75 80 85 90 95 100 105 F 60 65 70 75 80 85 90 95 100 105 F Outdoor ambient temperature Outdoor ambient temperature MUZ FH12NA MUZ FH12NAH PSIG 500 290 88 PSIG o 180 3 400 78 a F 86 8 160 Indoor DB temperature E 140 70 300 B 120 5 250 100 200 80
10. board cannot be received normally for 3 minutes Refer to 10 5 How to check miswiring and serial signal error Indoor outdoor communication receiving error Although the inverter P C board sends signal 0 signal 1 has been received 30 consecutive times Refer to 10 5 How to check miswiring and serial signal error Outdoor power system Overcurrent protection cut out operates 3 consecutive times within 1 minute after the compressor gets started Reconnect connectors Refer to 10 5 How to check inverter compressor eCheck stop valve Discharge temperature thermistor Defrost thermistor 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 Outdoor heat exchanger temperature thermistor 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 the power module 1 700 FH09 12 IGBT module 1C700 FH15 Reconnect compressor connector Refer to 10 5 How to check inverter compressor eCheck stop valve Compressor synchronous abnormality Compressor start
11. heater Discharge temperature thermistor Protection O Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protec tion Defrost thermistor Heating Defrosting Fin temperature thermistor Protection Ambient temperature thermistor Cooling Low ambient tempera ture operation Heating Defrosting Heater Outdoor heat exchanger tem perature thermistor MUZ FH NAH only OBH584A Cooling Low ambient tempera ture operation Cooling High pressure protec tion 21 9 SERVICE FUNCTIONS MUZ FHO9NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH MUZ FH15NA MUZ FH15NAH 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 Jumper MUZ FH09 12NA MUZ FH15NA MUZ FH09 12NAH MUZ FH15NAH Soldered Initial setting 41 F 5 C 50 F 10 C None o 50 F 10 C 64 F 18 C 9 2 PRE HEAT CONTROL SETTING MUZ FH09 12 When moisture gets into the refrigerant cycle it may interfere the start up of the compressor at low outside temperature The pre heat control prevents this interference The pre heat control turns ON when the discharge temperature thermistor is 68 F 20 C or below When the pre heat contr
12. 169 1 269 Comp current 2 32 2 10 3 01 2 72 3 60 3 26 4 06 3 67 4 46 4 03 4 87 4 40 Fan motor current 0 36 0 33 0 34 0 31 0 41 0 37 0 40 0 36 1 21 1 09 1 24 1 12 Refrigerant circuit Condensing pressure 352 323 374 340 361 391 Suction pressure 153 110 135 106 131 108 Discharge temperature 148 145 156 148 152 170 Condensing temperature 107 101 112 105 109 115 Suction temperature 64 41 56 36 52 45 Comp shell bottom temperature 129 125 137 128 135 147 Ref pipe length Refrigerant charge R410A Indoor unit 80 80 80 Intake air temperature 67 67 67 58 56 52 Discharge air temperature 55 54 51 Fan speed High 1 150 1 190 1 220 Airflow High 381 Wet 398 Wet 411 Wet Outdoor unit 95 95 95 Intake air temperature Fan speed Airflow OBH584A 7 5 CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY MUZ FHO9NA MUZ FHO9NAH Correction of Cooling capacity 2b Correction of Cooling total input Correction of Heating capacity ae Correction of Heating total input a o 0 5 Capacity correction factors o 0 0 0 0 25 50 75 100 Hz 25 50 75 100 Hz 0 25 50 75 100 Hz 0 25 50 75 100 Hz The operational frequency of compressor Th
13. 8 10 Model MUZ FH12NA MUZ FH12NAH Calculation X oz 1 62 5 oz ft x Refrigerant piping length ft 25 NOTE Refrigerant piping exceeding 25 ft requires additional refrigerant charge according to the calculation Outdoor unit Refrigerant piping length one way ft Model ode precharged 40 50 60 70 80 MUZ FH15NA MUZ FH15NAH Ib 7 oz 3 24 5 40 7 56 9 72 11 88 Calculation X oz 1 08 5 oz ft x Refrigerant piping length ft 25 OBH584A 7 DATA MUZ FHO9NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH MUZ FH15NA MUZ FH15NAH 7 1 PERFORMANCE DATA 1 COOLING CAPACITY Indoor air Outdoor intake air DB temperature F 85 95 105 IWB F SHC TPC TC SHC TC SHC 71 8 1 0 55 9 7 7 6 0 59 9 0 7 1 67 8 9 0 52 9 0 8 3 0 56 84 7 7 63 9 6 0 50 8 5 8 9 0 53 7 7 8 1 71 9 6 0 85 9 0 0 91 8 4 67 0 80 0 87 9 3 63 0 77 0 83 9 9 71 1 17 1 26 8 5 67 1 11 1 20 9 8 63 1 06 1 15 10 7 NOTE 1 IWB Intake air wet bulb temperature TC Total Capacity x10 Btu h SHC Sensible Heat Capacity x10 Btu h TPC Total Power Consumption kW 2 SHC is based 80 F of indoor Intake air DB temperature 2 COOLING CAPACITY CORRECTIONS Refrigerant piping length one way ft 2
14. P C board Replace the inverter Turn ON the power supply and 3 minutes after the power supply is turned Yes P C board press EMERGENCY OPERATION ON switch once COOL mode No Replace the 4 way valve MUZ FH15 First of all measure the resistance of R V coil to check if the coil is defective Refer to 10 4 x In case CN602 is disconnected or R V coil is open voltage is generated between the terminal pins of the connector although no signal is being transmitted to R V coil Check if CN602 is connected Unit operates COOL mode even if it is set to HEAT mode Disconnect connector between the compressor and the IGBT module Is there 208 230 VAC between CN602 1C700 and on the inverter P C board Replace the inverter Turn ON the power supply and press 3 minutes after the power supply is turned P C board EMERGENCY OPERATION switch ON twice HEAT mode Yes Replace the 4 way valve the 4 way valve Unit operates HEAT mode even if it is set to COOL mode Disconnect connector between the compressor and the IGBT module Is there 208 230 VAC between CN602 1 700 and on the inverter P C board Replace the inverter Turn ON the power supply and 3 minutes after the power supply is turned Yes P C board press EMERGENCY OPERATION ON switch once COOL mode No Replace the 4 way valve OBH584A m D Check of outdoor fan motor
15. W How to check miswiring and serial signal error Turn OFF the power supply Y Is there rated voltage Y Yes Turn ON the power supply NOTE Refer to the indoor unit service manual in the power supply No Check the power supply Y lt Is there rated voltage between the outdoor terminal block S1 and S2 No Check the wiring yres Press EMERGENCY OPERATION switch once Y Does the left lamp of OPERATION INDICATO lamp light up Confirmation of the power to the indoor unit No Yes ERE Y Is there any miswiring poor contact or wire Is serial signal error indicated 6 minutes later disconnection of the Correct them No Yes indoor outdoor connect Yes ing wire No lt Y A 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 Bridge the outdoor terminal block S2 and Be sure to confirm the wiring is correct before the opera tion starts X3 Be sure to check this within 3 minutes after turning ON After 3 minutes LED blinks 6 times Even when the S3 xd inverter P C board is normal LED blinks 6 times after 3 minutes Y Turn ON the power supply Y Is the bus bar voltage of the inverter P C board
16. We will not be held responsible for mechanical failure system malfunction unit breakdown or accidents caused by failure to follow the instructions Revision A 9 SPECIFICATION has been modified The values of COP have been modified 10 TROUBLESHOOTING has been modified 1 TECHNICAL CHANGES MUZ FHO9NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH MUZ FH15NA MUZ FH15NAH 1 New model OBH584A 2 PART NAMES AND FUNCTIONS MUZ FHO9NA MUZ FH12NA MUZ FHO9NAH MUZ FH12NAH Air inlet back and side Ht t HRQ m TRO ili Kee x Bm SUM i Air outlet Drain outlet MUZ FH15NA MUZ FH15NAH Air inlet back and side Piping Drain outlet OBH584A SPECIFICATION Outdoor unit model MUZ FH09NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH MUZ FH15NA MUZ FH15NAH Capacity Rated Minimum Maximum Cooling 1 9 000 1 700 12 000 12 000 2 500 13 600 15 000 6 450 19 000 Heating 47 1 10 900 1 600 18 000 13 600 3 700 21 000 18 000 5 150 24 000 Capacity Rated Maximum Heating 17 2 6 700 12 200 8 000 13 600 11 000 18 000 Power consumption Rated Minimum Maximum Cooling 1 560 100 1 000 870 170 1 150 1 200 410 2 200 Heating 47
17. coil CN602 208 230 VAC LEV connector CN724 LED d Defrost thermistor RT61 CN671 Discharge temperature thermistor RT62 CN671 44 Outdoor heat exchanger Ja temperature thermistor XP RT68 CN671 Ambient temperature J thermistor RT65 CN672 Fin temperature thermistor RT64 CN673 Jumper wire for changing defrost setting JS Jumper wire for pre heat control i setting JK E AE MER ELE ALL LL LLL ELS ER HE ER FEX ER ERES EE N H 032 50 68 86 104 122 140 158 176 Temperature F 11 DISASSEMBLY INSTRUCTIONS lt 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 Pull the terminal while pull out the terminal pushing the locking slowly lever 11 1 MUZ FHO9NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH Connector NOTE Turn OFF power supply before disassembly OPERATING PROCEDURE PHOTOS 1 Removing the cabinet Photo 1 1 Remove the screw fixing the service panel 2 Pull down the servic
18. 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 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 Removing outdoor fan motor 1 Remove the top panel cabinet and service panel Refer to 1 2 Disconnect the following connectors Inverter P C board CN931 and CN932 Fan motor 8 Remove the propeller 4 Remove the screws fixing the fan motor 5 Remove the fan motor 6 Removing the compressor and 4 way valve 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Remove the inverter assembly Refer to 2 4 Remove the soundproof felt 5 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG 6 Detach the brazed part of the suction and the discharge pipe connected with compressor 7 Remove the nuts fixing the compressor 8 Remove the compressor 9 Detach the brazed parts of 4 way valve and pipe Photo 4 OBH584A 2 Photo 7 Outdoor heat exchanger Ambient temperature temperature thermistor thermistor outdoor fan mo
19. 009 HEAT EXCHANGER 26H HEATER PROTECTOR H DEFROST HEATER MF FAN MOTOR EMP THERMISTOR IC7O0 IGBT Module PTC64 CIRCUIT PROTECTION TBI TB2 TERMINAL BLOCK IC820 DIODE Module PTC65 CIRCUIT PROTECTION T801 TRANSFORMER OTES 1 About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing Use copper conductors only for field wiring 3 Symbols indicate Terminal block OBH584A 6 REFRIGERANT SYSTEM DIAGRAM MUZ FHO9NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH Unit inch Refrigerant pipe 23 8 with heat insulator Away valve lt lt Outdoor heat exchanger 7 Stop mes temperature Muffler Outdoor thermistor Flared connection d heat RT68 temperature4__ Service exchanger lI Service thermistor P port pot RT62 Compressor Ambient temperature a I I Defrost Ss fel 5E Capillary O D 0 118 x II I D 0 079 x 8 9 32 Strainer Capillary tube 83 0 x 22 0 x 210 100 Flared connection O D 0 157 x N I D 0 094 x 9 7 16 LEV 04 0 x 92 4 x 240 25 Oq s eating E gt lt JUU gt lt cooling OFF Stop valve with strainar Refrigerant pipe 21 4 Refrigerant flow in cooling with heat insulator 4 f 23 gt Refrigerant flow in heating MUZ FH15NA MUZ FH15NAH Muffler Refrigerant pipe 21 2 4 way valve 100 with heat insulator Flared con
20. 1 710 110 1 470 950 280 2 300 1 300 430 3 360 Power consumption Rated Maximum Heating 17 2 600 1 440 720 1 900 1 020 2 480 EER 1 SEER 3 Cooling 16 1 30 5 13 8 26 1 12 5 22 0 HSPF IV x4 Heating NA 13 5 NA 12 5 NA 12 0 NAH 12 5 NAH 11 5 NAH 11 0 COP Heating 1 4 50 4 20 4 06 Power supply V phase Hz 208 230 1 60 Max fuse size time delay A 15 20 Min circuit ampacity A 11 16 Fan motor F L A 0 50 0 93 Compressor SNB092FQAMT SNB140FQUMT SNB172FQKMT R L A 8 2 12 0 L R A 10 3 15 0 Refrigeration oil L Model 0 35 FV50S 0 35 FV50S 0 40 FV50S Refrigerant control Linear expansion valve Sound level 1 Cooling dB A 48 49 51 Heating 49 51 55 Defrost method Reverse cycle Dimensions 31 1 2 33 1 16 11 1 14 13 W D H 21 5 8 34 5 8 Weight 83 124 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 Min wall thickness Liquid 1 4 0 0315 Gas 3 8 0 0315 1 2 0 0315 Connection method Indoor Flared Outdoor F
21. 1 1 2 2 3 4 te OBH584A MUZ FH15NA MUZ FH15NAH Unit inch REQUIRED SPACE 1 20 in 500 mm or more when front and sides of the unit are clear 16 7 16 Drain hole 1 5 8 Air in 1 9 16 13 14 3 16 Air out 2 holes 13 32 X 13 16 6 7 8 19 11 16 e gt e 2 When any 2 sides of left right and rear of the unit are clear 33 1 16 4 5 16 3 3 16 Service panel CE Liquid refrigerant pipe joint Refrigerant pipe flared o 1 4 0 A Uys 22 2 Z BZ 34 5 8 T YBN A N SS e Gas refrigerant pipe joint Refrigerant pipe flared e 1 2 7 11 16 6 1 2 3 29 32 OBH584A T 5 WIRING DIAGRAM MUZ FHO9NA MUZ FH12NA B 1 ORB SD oe BLK 063 Por WC OPTION PARTS I mi BLK INVERTER P C BOARD m aa LD6 LK BLK O CIRCUIT CM43 CMM BLU om pape MI SIPIY 5 1 0 o
22. 17 1 66 2 26 0 87 1 18 WHT RED BLK V W U Outdoor fan motor Measure the resistance between lead wires using a tester Temperature 14 104 F 10 40 C Normal Q MUZ FH09 12 MUZ FH15 Color of lead wire RED BLK BLK WHT WHT RED 29 40 12 16 WHT RED BLK W U Kea R V coil 2154 Measure the resistance using a tester Temperature 14 104 F 10 40 C Normal kQ 0 97 1 38 Expansion valve coil LEV Measure the resistance using a tester Temperature 14 104 F 10 40 C Color of lead wire Normal Q RED ORN RED WHT RED BLU RED YLW 37 54 Defrost heater OBH584A Measure the resistance using a tester Temperature 14 104 F 10 40 C Normal Q MUZ FH09 12NAH MUZ FH15NAH 349 428 376 461 30 10 5 TROUBLESHOOTING FLOW amp How to check inverter compressor and the power module 1C700 MUZ FH09 12 IGBT Disconnect the connector between the compressor module 10700 MUZ FH15 Y Check the voltage between terminals 77 See 10 5 Check of open phase Y Are the voltages balanced No Replace the inverter P C board Yes Check the compressor frees See 10 5 Check of compressor Check of open phase e With the connector between the compre
23. 5 std 40 OBH584A 3 HEATING CAPACITY Indoor air Outdoor intake air WB temperature F 25 35 43 DE UEM TC TPC TC TPC TC TPC 75 7 9 0 62 9 4 0 69 0 73 70 8 2 0 61 9 6 0 67 0 71 65 8 6 0 59 0 66 0 69 75 7 9 0 75 9 4 0 69 0 73 70 8 2 0 74 9 6 0 67 0 71 65 8 6 0 72 0 66 0 69 75 9 9 0 83 0 93 0 97 70 0 81 0 90 0 95 65 0 78 0 88 0 93 75 5 0 96 0 93 0 97 70 0 94 0 90 0 95 65 0 91 0 88 0 93 75 1 14 1 27 1 33 70 2 1 11 1 24 1 30 65 3 1 07 1 20 1 27 75 1 27 1 27 1 33 70 1 24 1 24 1 30 65 1 20 1 20 1 27 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 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 oc RO
24. AT 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 OBH584A 3 8 ACTUATOR CONTROL MUZ FHO9NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH MUZ FH15NA MUZ FH15NAH 8 1 8 2 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 i i i Compressor OFF ON Outdoor fan motor OFF R V COIL CONTROL OFF Heating Saku de Series ON Cooling Bact CA RE eae tak tae OFF Dry TECUM DUE TERCER ATI EUN OFF NOTE The 4 way valve reverses for 5 seconds right before start up of the compressor COOL HEAT 5 seconds 5 seconds ON E TNI oh EN OFF LL E Outdoor fan ON PEE OFF motor R V coil 8 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Actuator Sensor Purpose Compressor Outdoor fan motor R V coil Indoor fan motor Defrost
25. BLK RED WHT RED lt lt Judgement gt gt Refer to 10 4 0 Q teres Abnormal short Infinite Q e Abnormal open NOTE Be sure to zero the ohmmeter before measurement E Check of compressor operation time e Connect the compressor and activate the inverter Then measure the time until the inverter stops due to over current Operation method Start heating or cooling operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERATION Refer to 7 6 lt lt Measurement gt gt Measure the time from the start of compressor to the stop of compressor due to overcurrent F Check of compressor start failure Measure the resistance between the lead wires at 3 points lt lt Judgement gt gt Abnormal ane failure Compressor winding short Abnormal lock out Starting defect C 10 seconds Disconnected connector Abnormal Cle val circuit defect Closed valve Normal 10 minutes Confirm that O is normal Electrical circuit check Contact of the compressor connector and JP30 MUZ FH15 on the inverter P C board Me Voltage between outdoor terminal block S1 S2 Output voltage of inverter P C board and balance of them See 10 5 Direct current voltage between DB61 and MUZ FH09 12 JP715 y e the compressor run for 10 seconds or more a
26. Changes for the Better MITSUBISHI Revision A 3 SPECIFICATION has been modified ELECTRIC 10 TROUBLESHOOTING has been modified Please void OBH684 SPLIT TYPE AIR CONDITIONERS OUTDOOR UNIT SERVICE MANUAL f R410A Models MUZ FHO9NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH MUZ FH15NA MUZ FH15NAH Indoor unit service manual MSZ FH NA Series OBH683 CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 3 3USPECIFIGATION oe eee 4 4 OUTLINES AND DIMENSIONS 6 5 WIRING 1 8 6 REFRIGERANT SYSTEM 11 e ep nM er Os ic 0 13 8 ACTUATOR CONTROL 21 9 SERVICE FUNCTIONS 22 10 TROUBLESHOOTING enn 23 11 DISASSEMBLY INSTRUCTIONS 44 MUZ FHO9NA MUZ FHO9NAH PARTS CATALOG OBB684 MUZ FH12NA MUZ FH12NAH NOTE RoHS compliant products have G mark on the spec name plate Use the specified refrigerant only Never use any refrigerant other than that specified Doing so may cause a burst an explosion or fire when the unit is being used serviced or disposed of Correct refrigerant is specified in the manuals and on the spec labels provided with our products
27. N OBH584A bs 7 2 PERFORMANCE CURVE Cooling Cooling capacity at Rated frequency 1 5 Indoor intake air Wet bulb a S 514 J temperature F Pos SETIS 28212 358 76 Oo O 1 1 gt 75 8 1 0 8 72 I 68 64 14 23 32 141 50 59 68 77 86 9 104 113 Outdoor intake air DB temperature F MUZ FHO9NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH SHF at rating condition 0 92 SHF at rating condition 0 83 Airflow 381 CFM Airflow 398 CFM 5 08 5 E 0 7 aperture 1 0 erature D E WB e Al 0 9 63 1 Q pare indoor 63 SZ os 05 z g 07 04 06 65 75 85 95 105 115 65 75 85 95 105 115 Outdoor intake air DB temperature F Outdoor intake air DB temperature F MUZ FH15NA MUZ FH15NAH SHF at rating condition 0 7 Airflow 411 CFM S 14 71 67 13 63 2 5 e F 8 x ure C o 1 1 we Temperat 5 woke o 1 0 doo W 09 z 65 75 85 95 105 115 Outdoor intak
28. RCUIT BREAKER 501 us ed 412 ea w b E J e amp Soh erasa fe INVERTER TB2 P C BOARD sadi BRN LED 8 _H cH 880 F90 i AT S MI eS 3 o EEDE HEH GE 05 Z CN671 CN672 CN673 CN BK ale BLK BLK 5 5 7 21 1 6 1 1 p E t BLK BLK RED HH HH ole 26H BLK 1771 222 j e194 C e kt tT t cm RT61 RT62 RT68 RTGS RT64 EV H BLK jy BLK SYMBOL NAME SYMBOL NAME SYMBOL AME SYMBOL NAME CB1 3 SMODTHING CAPACITOR 1C932 I6BT Module RT61 DEFROST THERMISTOR X601 RELAY F65 FBEFUSE 6 3AL250V IL REACTOR RT62 DISCHARGE TEMP THERMISTOR X602 RELAY F601 FUSE T3 15 250 LED LED RT64 FIN TEMP THERMISTOR X64 RELAY F880 FUSE T3 15AL250V LEV EXPANSION VALVE COIL RT65 AMBIENT TEMP THERMISTOR 2154 REVERSING VALVE COIL F901 FUSE T3 15AL250V MC COMPRESSOR preg 0070
29. TER P C BOARD S ED 1062 BLK BLK um BLK CIRCUIT CN643 TB SUPPLY 0 0 2 o oM 1 o 1 o o o o o oj EL MB JOE VETE eee ria About the indoor side electric 3 41 4 EN wiring refer to the Indoor Mi K dms Rel 53 unit electric wiring diagram 3 m 2 Use copper conductors only MF LEV S1T ur For field wiring corr 3 Symbols indicate Terminal block SYMBOL NAME SYMBOL NAME SYMBOL NAME C61 C62 SMOOTHING CAPACITOR L61 REACTOR RT68 OUTDOOR HEAT EXCHANGER DB61 DIODE MODULE MC COMPRESSOR TEMP THERMISTOR F701 F801 F901 FUSE T3 15AL250V MF FAN MOTOR TERMINAL BLOCK H DEFROST HEATER PTC64 PTC65 CIRCUIT PROTECTION T801 TRANSFORMER 10100 1682 1C932 POWER MODULE RT61 DEFROST THERMISTOR X63 X64 X66 RELAY 1C802 POWER DEVICE RT62 DISCHARGE TEMP THERMISTOR 2154 REVERSING VALVE COIL LED LED RT64 FIN TEMP THERMISTOR 26H HEATER PROTECTOR LEV EXPANSION VALVE COIL RT65 AMBIENT TEMP THERMISTOR OBH584A I MUZ FH15NA CIRCUIT BREAKER E L 1 sve sl r 48 GRN YL POWER SUPPLY 208 230V 1 phase 60Hz
30. board Nonvolatile memory data 5 time flash 2 5 seconds OFF Nonvolatile memory data cannot be read properly Replace the inverter P C board Power module IC700 FH09 12 IGBT module 1 700 FH15 6 time flash 2 5 seconds OFF The interface short circuit occurs in the output of the power module 1C700 FH09 12 IGBT module 1 700 FH15 The compressor winding shorts circuit Refer to 10 5 How to check inverter compressor NOTE Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE 10 3 OBH584A 26 The left lamp of the OPERATION INDICATOR lamp Indoor unit Abnormal point Failure mode protection LED indication Outdoor P C board Condition Remedy Indoor outdoor unit failure mode recall function Outdoor unit failure mode recall function 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 eCheck refrigerant circuit and refrigerant amount O 11 time flash 2 5 seconds OFF DC voltage 8 time flash 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 co
31. d relay panel p 1 Remove the cabinet and panels Refer to 1 BS On uc 2 Disconnect the lead wire to the reactor and the following con Inverter P C Ground wires 2e SUPR nectors lt lnverter P C board gt 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 CN601 Defrost heater and heater protector MUZ FH15NAH 3 Remove the compressor connector 4 Remove the screws fixing the relay panel 5 6 Remove the relay panel Remove the ground wires and the lead wires of the inverter P C board 7 Remove the screws of the P B support 8 Remove the inverter P C board from the P B support 2 Screws of the P B support Screw of the relay panel Screw of the relay panel Photo 6 Screw of the R V coil 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 Brazed parts of 4 way valve OBH584A OPERATING PROCEDURE PHOTOS 4 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
32. e 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 OBH584A m Heating Heating capacity at Rated frequency 1 3 59 68 o _12 79 244 a 1 0 RE lt VN wer 509 e ied 29 9 wee cert 25 08 ot Y r 25 aE GE 207 s gm 2 3 Z 06 T 805 O 0 4 4 5 14 23 32 41 50 59 Outdoor intake air WB temperature F MUZ FH09NA MUZ FHO9NAH Airflow 437 CFM Airflow 437 CFM 08 65 _ 10 5 5 0 9 3 06 E 08 2 2 07 5 83 erature F 9z 0 6 s 04 ceat pB tem 5 0 0 indoor intel 05 f oor intake air DB Tee a n 0 4 P o2 5 5 15 25 35 45 55 65 5 5 15 25 35 45 55 65 Outdoor intake air WB temperature F MUZ FH12NA Airflow 454 CFM 1 2 0 9 0 6 ir DB ndoot intake air Total power consumption KW 5 5 15 25 35 45 55 65 Outdoor intake air WB temperature F MUZ FH15NA 1 50 Total power consumption KW 5 5 15 25 35 45 55 65 Outdoor intake air WB temperature F Outdoor intake air WB temperature
33. e 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 na wiring j Is the indoor outdoor connecting wire Extend the distance between the indoor outdoor of the air conditioner and the wiring of Y connecting wire of the air conditioner and the wir the antennas close es ing of the antennas No 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 following before asking for service Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave Channel frequency broadcast station affected by the electromagnetic noise Channel frequency broadcast station unaffected by the electromagnetic noise Layout of indoor outdoor unit of the air conditioner indoor outdoor wiring ground 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 pres
34. e operational frequency of compressor The operational frequency of compressor The operational frequency of compressor Input correction factors Capacity correction factors 5 EN Input correction factors MUZ FH12NA MUZ FH12NAH Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 2 0 2 2 5 o 0 5 o Capacity correction factors Input correction factors Capacity correction factors Input correction factors 0 0 0 0 0 0 0 50 P 100 Hz 0 25 50 75 100 Hz _ 0 25 50 75 100 Hz 0 25 50 75 100 Hz The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ FH15NA MUZ FH15NAH Correction of Cooling capacity a Correction of Cooling total input m Correction of Heating capacity Correction of Heating total input a o Input correction factors o a Capacity correction factors Capacity correction factors a Input correction factors 0 0 0 0 0 25 50 75 100 Hz 0 25 75 100 Hz 0 25 50 75 100 Hz 0 25 50 75 100 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 HE
35. e panel and remove it 3 Remove the screws fixing the conduit cover 4 Remove the conduit cover Photo 4 5 Remove the screw fixing the conduit plate Photo 5 6 Remove the conduit plate Screws of the top panel ii II 7 Disconnect the power supply wire and indoor outdoor I connecting wire I III MU 8 Remove the screws fixing the top panel 9 Remove the top panel 10 Remove the screws fixing the cabinet 11 Remove the cabinet 12 Remove the screws fixing the back panel 13 Remove the back panel Photo 2 e Screws of 2 the cabinet panel Screws of the Photo 3 top panel pp Screw of the Screws of the terminal block support and the back panel Direction to remove Screws of the cabinet Screws of the cabinet OBH584A m OPERATING PROCEDURE PHOTOS Screws of the Screw of the conduit cover conduit plate 2 Removing the inverter assembly inverter P C board Photo 6 1 Remove the cabinet and panels Refer to 1 Screws of the heat sink 2 Disconnect the lead wire to the reactor and the following support and the separator connectors Inverter P C board CN721 R V coil CN722 Defrost heater and heater protector MUZ FHO09 12NAH CN931 CN932 Fan motor CN641 Defrost thermistor and discharge temperature ther mistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor
36. e thermistor from its holder 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 Outdoor heat exchanger tempera ture thermistor Mill IIIIIII Defrost thermistor preme Photo 10 i L IE Avv tiit OBH584A OPERATING PROCEDURE PHOTOS 5 Removing outdoor fan motor Photo 11 1 Remove the cabinet and panels Refer to 1 Screws of the outdoor fan motor 2 Disconnect the following connectors Inverter P C board CN931 CN932 Fan motor Remove the propeller nut Remove the propeller Remove the screws fixing the fan motor Remove the fan motor 3 4 5 6 Propeller 6 Removing the compressor and 4 way valve Photo 12 1 Remove the cabinet and panels Refer to 1 2 Remove the inverter assembly Refer to 2 Remove the screws fixing the reactor Screws of Remove the reactor the reactor Remove the soundproof felt Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG 7 Detach the brazed part of the suction and the discharge pipe connected with compressor 8 Remove the nuts fixing the compressor 9 Remove the compressor 10 Detach the brazed part of pipes connected with 4 way valve
37. eplace the inverter between JP715 and JP30 Yes Refer we No P C board MUZ FH15 on the inverter P C board Refer to 10 6 1 No If light up OK Check the electric parts in main circuit If flash refer to 10 3 Yes 260 370 VDC OF Inverter P C board Solder side MUZ FH09 12 JP30 JP715 294 370 VDC MUZ FH15 OBH584A x K Check of LEV Expansion valve ON the power supply Preparation of the remote controller While pressing both OPERATION SELECT button and TEMP button on the remote controller at the same time press RESET button First release RESET button Hold down the other two buttons for another 3 sec onds Make sure that the indicators on the LCD screen lease in the right figure are all displayed Then re lease the buttons Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit X1 CEIM Mon Tue Wed Thu Fri Sat Sun SET 0 AMPM OFF AMPM 1234 dor DE DO SOHO Y Expansion valve operates in full opening direction Y X1 Regardless of normal or abnormal condition a short beep Do you hear the expansion valve click is emitted once the signal is received click mM Do you feel the expansion valve vibrate Yes on touching it
38. from No each other Attach a filter on remote control receiv ing section Is serial signal error indicated 6 minutes later Replace the indoor power P C board of the indoor Replace the indoor elec tronic control P C board Yes No unit OBH584A 39 Check of defrost heater MUZ FHO9NAH MUZ FH12NAH MUZ FH15NAH Check the following points before checking electric continuity 1 Does the resistance of ambient temperature thermistor have the characteristics Refer to 10 6 1 2 Is the resistance of defrost heater normal Refer to 10 4 3 Does the heater protector remain conducted not open 4 Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors In HEAT mode for more than 5 minutes let the ambient temperature thermistor continue to read 32 F 0 C or below and let the defrost thermistor continue to read 30 F 1 C or below NOTE In case both thermistors are more than the above temperature cool them with cold water etc Is there 208 230 VAC between CN722 D and O N yes MUZ FH09 12 CN601 and MUZ FH15 on Not the problem of the inverter P C board the inverter P C board Refer to 10 6 1 No Replace the inverter P C board Check of outdoor refrigerant circuit The unit occasionally stops when the vas The ope
39. fter it starts UE After the compressor is heated with a drier does the compressor start x1 No Yes Compressor start failure Activate pre heat control Refer to 9 2 PRE HEAT CONTROL SETTING OBH584A sd Check the refrigerant circuit Yes Check the stop valve Replace the compressor x1 Heat the compressor with a drier for about 20 minutes Do not recover refrigerant gas while heating 1 Heating part Check of outdoor thermistors Disconnect the connector of thermistor in the inverter P C board N below table and measure the resistance of thermistor Y Is the resistance of thermistor normal Refer to 10 6 1 yes Reconnect the connector of thermistor Does the unit operate for 10 minutes or more without showing thermistor abnormality No Replace the inverter P C board yes OK Cause is poor contact MUZ FH09 12 Thermistor Connector Pin No Replace the thermistor except RT64 ecc When RT64 is abnormal replace the inverter P C o board Turn ON the power supply and press EMERGENCY OPERATION switch Defrost Between CN641 pin1 and pin2 Discharge temperature Between CN641 pin3 and pin4 Fin temperature Between CN642 pin1 and pin2 Ambient temperature Between CN643 pin1 and pin2 Outdoor heat exchange
40. ge Refer to 10 5 0 Check of outdoor fan motor 5 time flash 2 5 seconds OFF High pressure pro tection Indoor coil thermistor exceeds 158 70 in HEAT mode Defrost thermistor exceeds 158 F 70 C in COOL mode eCheck refrigerant circuit and refrig erant amount eCheck stop valve 8 time flash 2 5 seconds OFF Compressor syn chronous abnormal ity The waveform of compressor current is distorted Reconnect connector of compressor Refer to 10 5 How to check inverter 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 D 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 inverter compressor 13 time flash 2 5 seconds OFF DC voltage DC voltage of inverter cannot be detected normally 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 Example When the flashing frequency is 2 I 0 5 second ON OBH584A s 0 5 second ON 2 5 second OFF 28 elt occurs with following case I
41. ient temperature MUZ FH12NA MUZ FH12NAH PSIG 450 PSIG 200 75 70 65 410 175 g PS n 5 150 370 E S a eo 2 2125 eS O 2 lt c 330 3 SSH 5 100 S 290 75 49 2 250 50 5 15 25 35 45 55 65 75 F 5 15 25 35 45 55 65 75 F Outdoor ambient temperature Outdoor ambient temperature MUZ FH15NA MUZ FH15NAH PSIG PSI 550 200 79 78 65 500 65 175 5 450 150 lt p ge a xe a 9 e 490 ve c 125 e E lt 4 2 S S g 350 100 NS 300 50 2 50Hz 250 50 5 15 25 35 45 55 65 75 F 5 15 25 35 45 55 65 75 F Outdoor ambient temperature Outdoor ambient temperature 18 OBH584A 7 4 STANDARD OPERATION DATA MSZ FHO9NA MSZ FH12NA MSZ FH15NA Cooling Heating Cooling Heating Cooling Heating Capacity 9 000 10 900 12 000 13 600 15 000 18 000 SHF 0 92 0 83 0 70 Input 0 560 0 710 0 870 0 950 1 200 1 300 Rated frequency 47 58 5 46 49 50 5 50 Electrical circuit Indoor unit MSZ FHO9NA MSZ FH12NA MSZ FH15NA Power supply 208 230 1 60 Input 0 029 0 029 0 031 Fan motor current 0 30 0 27 0 30 0 27 0 31 0 28 Outdoor unit MUZ FH09NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH MUZ FH15NA MUZ FH15NAH Power supply 208 230 1 60 Input 0 531 0 681 0 841 0 921 1
42. in the refrigerant circuit are detected based on the temperature sensed by the indoor and outdoor thermistors and the current of the compressor Check for a gas leak in a connecting piping etc eCheck the stop valve Refer to 10 5 Check of outdoor refrigerant circuit Outdoor unit stops and restarts 3 minutes later is repeated 2 time flash 2 5 seconds OFF Overcurrent protec tion Large current flows into the power module IC700 FH09 12 IGBT module 1C700 FH15 Reconnect connector of compressor Refer to 10 5 How to check inverter compressor Check stop valve 3 time flash 2 5 seconds OFF Discharge tem perature overheat protection 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 Check refrigerant circuit and refrig erant amount Refer to 10 5 Check of LEV 4 time flash 2 5 seconds OFF Fin temperature P C board tem perature thermistor overheat protection Temperature of the fin temperature thermistor on the heat sink exceeds 167 187 F 75 86 C FH09 12 167 176 F 75 80 C FH15 or temperature of P C board temperature thermistor on the inverter P C board exceeds 162 185 F 72 85 C FH09 12 158 167 F 70 75 C FH15 eCheck around outdoor unit Check outdoor unit air passa
43. lared Between the indoor amp outdoor units Height difference 40 50 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 Heating Indoor 70 FDB 60 FWB Outdoor 17 FDB 15 FWB 3 2 OBH584A 2 lb 9 OZ Ib 7 oz Test condition 5K3 3k4 Indoor air condition F Outdoor air condition F Dry bulb Wet bulb Dry bulb Wet bulb Test 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 B 1 Cooling Steady State Cooling at minimum compressor Speed 80 67 82 65 F 1 Cooling Steady State at minimum compressor Speed E V Cooling Steady State at Intermediate compressor Speed 5 H1 2 Heating Steady State at rated compressor Speed H3 2 Heating at rated compressor Speed HSPF HO 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 5 80 67 67 53 5 80 67 87 69 70 60 47 70 60 17 70 60 62 70 60 47 70 60 35 3 amp 5 At Intermediate compressor Speed
44. memorized failure details can be recalled 1 Flow chart of failure mode recall function for the indoor outdoor unit Operational procedure The cause of abnormality cannot be found because the abnormality does not recur Setting up the failure mode recall function Turn ON the power supply lt Preparation of the remote controller gt While pressing OPERATION SELECT button and TEMP button on the remote controller at the same time press RESET button First release RESET button Hold down the other two buttons for another 3 seconds Make sure that the indicators on the LCD screen shown in the right figure are all displayed Then release the but tons 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 X1 M CSET JCLOCKOON AMPM OFF AMPM X1 Regardless of normal or abnormal condition 1234 895 BB BB SBBEBB a short beep is emitted once the signal is Y received Does the left lamp of the OPERATION INDICATOR lamp on Indoor unit is normal the indoor unit blink at the interval of 0 5 seconds But the outdoor unit might be abnormal because there are some abnor Blinks Either indoor or outdoor unit is abnormal Beep is emit malities that can not be recalled with this way ted at the same timing as the blinking of the left lamp of Check if outdoor unit is abn
45. mpressor 14 time flash or more 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 4 way valve Pipe temperature 16 time flash 2 5 seconds OFF The 4 way valve does not work properly The indoor coil thermistor detects an abnormal temperature Check the 4 way valve Replace the inverter P C board Outdoor refrigerant system abnormality 17 time flash 2 5 seconds OFF Aclosed valve and air trapped in the refrigerant circuit are detected based on the temperature sensed by the indoor and outdoor thermistors and the current of the compressor eCheck for a gas leak in a connecting piping etc eCheck the stop valve Refer to 10 5 Check of outdoor refrigerant circuit NOTE Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE 10 3 OBH584A 27 10 3 TROUBLESHOOTING CHECK TABLE Symptom LED indication Abnormal point Condition Condition Remedy Outdoor unit does not op erate 1 time flash every 2 5 seconds Outdoor power sys tem Overcurrent protection cut out operates 3 consecutive times within 1 minute after the compressor gets started Reconnect connector of compres sor Refer 10 5 How to check inverter compressor Check stop valve Outdoor thermistors Discharge tempe
46. nection Discharge Ambient temperature temperature Service thermistor Defrost ihermistor pot 8162 thermistor RT65 Outdoor heat exchanger temperature thermistor Flared connection Strainer Muffler LEV Strainer 1 100 100 R V coil heating ON Capillary tube cooling Refri t pipe 21 4 was s Refri t flow i li efrigerant pipe gt gt Refrigerant flow in cooling with heat insulator d Refrigerant flow in heating OBH584A MAX REFRIGERANT PIPING LENGTH and MAX HEIGHT DIFFERENCE Refrigerant piping ft Piping size O D in Model Max Length Max Height difference A B Liquid MUZ FH09NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH MUZ FH15NA MUZ FH15NAH 1 4 Indoor unit Max Height difference B Max Length A Outdoor unit ADDITIONAL REFRIGERANT CHARGE R410A oz NOTE Refrigerant piping exceeding 25 ft requires additional refrigerant charge according to the calculation Outdoor unit Refrigerant piping length one way ft precharged 30 40 50 60 Model MUZ FH09NA MUz FHooNAH 210 9 0 3 24 5 40 Calculation X oz 1 08 5 oz ft x Refrigerant piping length ft 25 NOTE Refrigerant piping exceeding 25 ft requires additional refrigerant charge according to the calculation Outdoor unit Refrigerant piping length one way ft precharged 30 40 50 60 2 lb 9 oz 4 86
47. normal Heer o e autor Refer to TEST POINT DIAGRAM AND VOLTAGE in the outdoor service manual No service manual Yes Y Does the LED on the inverter P C board repeat M EH and 0 8 second ON quick blinking 33 No Lighted Yes s pe X2 Be careful of the residual voltage of lighted smoothing capacitor Turn OFF the power supply Remove the bridge between the outdoor terminal block S2 and S3 Turn ON the power supply Y Check the wiring If there are any error of the indoor outdoor connecting wire 2 E ato or borer VOUS indoor terminal block 51 and 2 N such as the damage of the wire intermediate connection o and or poor contact to the terminal block replace the indoor Yes outdoor connecting wire Is there amplitude of 10 to 20 VDC between the indoor terminal block S2 and S3 Confirmation of serial signal No Yes A Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again and JPG GND on the indoor electronic Y Is there 2 VDC or less between CN202 Press EMERGENCY OPERATION switch control P C board yee Y Reinstall either the unit or the light board Is there 2 VDC or less between CN202A 8 and JPG GND on the indoor electronic control P C Is there 2 VDC or less between CN202 8 and JPG GND on the indoor electronic control P C Yes board away
48. nstantaneous power voltage drop Short time power failure FH15 Refer to 10 5 Check of power supply FH15 Refer to 10 5 How to check in verter compressor Inverter P C board MUZ FH09 12NA H 1 Flashing gt W LED MUZ FH15NA H Flashing 7X LED Symptom LED indication Abnormal point Condition Condition Remedy Outdoor unit operates 1 time flash 2 5 seconds OFF Frequency drop by current protection FH09 12 When the input current exceeds approximately 10A FH09 10 5A FH12 compressor frequency lowers FH15 Current from power outlet is nearing breaker ca pacity 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 Frequency drop by defrosting in COOL mode Indoor coil thermistor reads 46 F 8 C or less in COOL mode compressor frequency lowers The unit is normal but check the following eCheck if indoor filters are clogged eCheck if refrigerant is short eCheck if indoor outdoor unit air circulation is short cycled 4 time flash 2 5 seconds OFF Frequency drop by discharge tempera ture protection Temperature of discharge temperature thermistor exceeds 232 F 111 C compressor frequency lowers eCheck refrigerant circuit and refrig erant amount Refer to 10 5 Check
49. of LEV Refer to 10 5 Check of outdoor thermistors MUZ FH09 12 5 time flash 2 5 seconds OFF Outside temperature thermistor protec tion When the outside temperature thermistor shorts or opens protective operation without that thermistor is performed Refer to 10 5 Check of outdoor thermistors 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 C 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 FH09 12 PAM protection PAM Pulse Ampli tude Modulation The overcurrent flows into PFC Power factor correction 1C820 or the DC voltage reaches 394 V or more PAM stops and restarts This is not malfunction PAM pro tection will be activated in the fol lowing cases 1 Instantaneous power voltage drop Short time power failure 2 When the power supply voltage is high MUZ FH15 Zero cross detecting circuit Zero cross signal cannot be detected elt occurs with following cases 1 Instantaneous power voltage drop Short time power failure 2 Distortion of primary voltage Refer to 10 5 D Check of power supply 9 time flash 2 5 seconds OFF Inverter check mode The connector of compressor is disconnected inverter check mode starts NOTE 1 The loca
50. ol turns ON the compressor is energized About 50 W MUZ FH15 Prolonged low load operation in which the thermostat is OFF for a long time at low outside temperature 32 F 0 C or less may cause the following troubles To prevent those troubles activate the pre heat control 1 If moisture gets into the refrigerant cycle and freezes it may interfer the start up of the compressor 2 If liquid refrigerant collects in the compressor a failure in the compressor may occur The pre heat control turns ON when the compressor temperature is 68 F 20 C or below When the pre heat control turns ON the compressor is energized About 70 W Pre heat control setting lt JK gt ON To activate the pre heat control cut JK wire of the inverter P C board OFF To deactivate the pre heat control solder 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 OBH584A 25 10 TROUBLESHOOTING MUZ FHO9NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH MUZ FH15NA MUZ FH15NAH 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 hori
51. or RT64 CN642 Signal of outdoor fan motor CN931 Ambient temperature thermistor RT65 Defrost thermistor RT61 CN641 CN643 Discharge temperature thermistor RT62 CN641 Outdoor heat exchanger temperature thermistor RT68 CN644 LEV connector CN724 Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Fin temperature thermistor RT64 00 Discharge temperature thermistor RT62 0 KT TT TET E tT A H H 4 Resistance kO Resistance kQ 0 0 0 4 14 32 50 68 86 104 32 50 68 86 104 122 140 158 176 194 212 200 248 32 50 68 86 Temperature F Temperature F Temperature F OBH584A is MUZ FH15NA MUZ FH15NAH Heater connector CN601 208 230 VAC MUZ FH15NAH Signal of out door fan motor CN931 Output to drive outdoor fan motor CN932 Fuse F901 T3 15AL250V Fuse F880 T3 15AL250V Defrost thermistor RT61 Ambient temperature thermistor RT65 0 Outdoor heat exchanger temperature thermistor RT68 Resistance kQ 041 314 32 50 68 86 104 Temperature F OBH584A SMOOA04S D I LE SELL S BB RUE RR eE A OSL 032 50 68 86 104 122 140 158 176 194 212 230 248 Temperature F 43 Resistance kQ Fuse F601 T3 15AL250V R V
52. ormal according to the detailed outdoor unit OFF the OPERATION INDICATOR lamp 2 failure mode recall function Refer to 10 2 2 Yes Judgment of indoor outdoor abnormality y Blinks Before blinking does the left lamp of the OPERATION INDI CATOR lamp stay ON for 3 seconds Stays ON for 3 seconds without beep The outdoor unit is Yes abnormal No Y Y The outdoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the outdoor unit failure mode table Refer to 10 2 3 Make sure to check at least two consecutive blinking cycles X3 The indoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to the indoor unit failure mode table Refer to indoor unit service manual Make sure to check at least two consecutive blinking cycles 7X2 lt 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 failure parts Deleting the memorized abnormal condition 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 rem
53. ote controller headed towards the indoor unit G 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 after 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 Blinking at 0 5 2 5 second OFF second interval 2 5 second OFF second interval 25 a i g n lt Sc OFF gt lt 7 401 ive O 4 ie gt a Beeps e 3 Beeps amp Beeps Repeated cycle i Repeated cycle Repeated cycle X3 Blinking pattern when the outdoor unit is abnormal MT 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 i He E se lt il i th OFF amp lt 2 4 E t 45 7 4 p No beep Beeps ba No beep lt lt 0 Repeated cycle Repeated cycle Repeated cycle OBH584A 2 Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal Check if outdoor uni
54. r temperature MUZ FH15 Thermistor Between CN644 pin1 and pin3 Connector Pin No Inverter P C board Defrost Between CN671 pin1 and pin2 Discharge temperature Between CN671 pin3 and pin4 Fin temperature Between CN673 pin1 and pin2 Ambient temperature Between CN672 pin1 and pin2 Outdoor heat exchanger temperature OBH584A Between CN671 pin5 and pin6 33 Inverter P C board Check of R V coil MUZ FH09 12 First of all measure the resistance of R V coil to check if the coil is defective Refer to 10 4 x In case CN721 is disconnected or R V coil is open voltage is generated between the terminal pins of the connector although no signal is being transmitted to R V coil Check if CN721 is connected Unit operates COOL mode even if it is set to HEAT mode Disconnect connector between the compressor and the power module Is there 208 230 VAC between CN721 1C700 and on the inverter P C board Replace the inverter Turn ON the power supply and press 3 minutes after the power supply is turned No board EMERGENCY OPERATION switch ON twice HEAT mode Yes Replace the 4 way valve the 4 way valve Unit operates HEAT mode even if it is set to COOL mode Disconnect connector between the compressor and the power module Is there 208 230 VAC between CN721 1 700 and on the inverter
55. ration started with stop valve is opened or closed during the stop valve closed and was it opened during operation Yes Yes p operation Open the stop valve and start the cooling operation again Has the operation stopped during pump down No The refrigerant gas amount may be 60 or less than the normal amount Identify where the gas is leaking from and fix the leak The operation has stopped to pre vent the diesel explosion caused by air trapped in the refrigerant circuit Close the stop valve and disconnect the power plug or turn the breaker OFF CAUTION Do not start the opera tion again to prevent hazards OBH584A 2 P Electromagnetic noise enters into TV sets or radios Is the unit grounded No Ground the unit Yes Extend the distance between the antennas and and the indoor unit within 9 91 ft 3m or is the distance between the antennas Yes and the outdoor unit within 9 91 ft 8m the indoor unit and or the antennas and the Is the distance between the antennas outdoor unit No Is the distance between the TV sets or ra dios and the indoor unit within 3 28 ft 1m Extend the distance between the TV sets and or or is the distance between the TV sets or radios and the indoor unit or the TV sets or radios and the outdoor unit within Yes radios and the outdoor unit 9 91 ft 3m No Are th
56. rature thermistor fin temperature thermistor defrost thermistor P C board temperature thermistor outdoor heat exchanger 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 The left lamp of the OPERATION INDICATOR lamp on the indoor unit lights up or flashes 7 time 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 Check connection between the in verter P C board and the relay P C board FH15 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 16 time flash 2 5 seconds OFF 4 way valve Pipe temperature The 4 way valve does not work properly The indoor coil thermistor detects an abnormal temperature Refer to 10 5 8 Check of R V coil Replace the inverter P C board 17 time flash 2 5 seconds OFF Outdoor refrigerant system abnormality A closed valve and air trapped
57. s 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 electromagnetic 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 OBH584A 10 6 TEST POINT DIAGRAM AND VOLTAGE 1 Inverter P C board MUZ FHO9NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH Smoothing Smoothing R V coil Heater connector i i i CN722 Back side of unit DB61 capacitor capacitor CN721 260 370 VDC C62 C61 208 230 VAC MUZ FH09 12NAH T Fuse F801 Fuse F701 use mee T3 15AL250V T3 15AL250V n gt Fuse F901 2 6 I dO T3 15AL250V I Rn i pad 5 ar Output to 2 v 1 drive outdoor B gt fan motor a i eee 208 230 Output to VAC drive compressor LDU ip i E LDV a TX QU ur Su i MEE ul gt mn obo sli 1 0 mR n HH as iu i i jo Ir ME gt 5 ve 4 x i a Nae eed Front side of unit Jumper wire for Jumper wire changing defrost for pre heat setting JS control setting JK Fin temperature thermist
58. ssor and the power module IC700 MUZ FH09 12 IGBT module IC700 MUZ FH15 disconnected activate the inverter and check if the inverter is normal by measuring the voltage balance between the termi nals 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 Measurement point At 3 points BLK U WHT V BLK U RED W WHT V RED W X Measure AC voltage between the lead wires at 3 points 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 winding No Replace the compressor Is the compressor normal Yes Refer to 10 5 Check of compressor 10 5 0 operation time Does the compressor operate continuously Yes No Refer to 10 5 Check of compressor start failure OBH584A i D Check of compressor winding eDisconnect the connector between the compressor and the power module 1 700 MUZ FH09 12 IGBT module IC700 MUZ FH15 and measure the resistance between the compressor terminals Measurement point At 3 points BLK WHT
59. t is abnormal according to the following procedures Y Make sure that the remote controller is set to the failure mode recall function Y With the remote controller headed towards the indoor unit press TEMP x1 Regardless of normal or abnormal condition 2 short button to adjust the set temperature to 77 F 25 C x1 beeps are emitted as the signal is received on the indoor unit blink at the interval of 0 5 seconds Does the left lamp of the OPERATION INDICATOR AN Blinks The outdoor unit is abnormal Beep is emitted at the same timing as the blinking of the left No lamp of the OPERATION INDICATOR lamp OFF X2 Yes Blinks The outdoor unit is abnormal Check the blinking pattern and identify the abnormal point by referring to ud the outdoor unit failure mode table 10 2 3 T outdoorunitis normal 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 Release the failure mode recall function accord Turn OFF the power supply and turn it ON again ing to the left mentioned procedure Press RESET button of the remote controller Y Repair the failure parts Deleting the memorized abnormal condition CD After repairing the unit recall the failure mode again according to Setting up the failure mode recall f
60. tion 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 Example When the flashing frequency is 2 OBH584A E 0 5 second ON n 0 5 second ON 2 5 second OFF 29 Check if the connector of the com pressor is correctly connected Refer to 10 5 How to check inverter compressor Inverter P C board MUZ FH09 12NA H Flashing LED MUZ FH15NA H Flashing 10 4 TROUBLE CRITERION OF MAIN PARTS MUZ FHO9NA MUZ FHO9NAH MUZ FH12NA MUZ FH12NAH MUZ FH15NA MUZ FH15NAH Part name Check method and criterion Defrost thermistor RT61 Fin temperature thermistor RT64 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Measure the resistance with a tester Refer to 10 6 Test point diagram and voltage 1 Inverter P C board for the chart of thermistor Discharge temperature thermistor RT62 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 for the chart of thermistor Compressor Measure the resistance between terminals using a tester Temperature 14 104 F 10 40 C Normal Q MUZ FH12 MUZ FH09 MUZ FH15 1 60 2
61. tor Photo 9 Brazed part of the suction pipe Soundproof felt Brazed part of the discharge pipe 16 Discharge temperature thermistor OBH584A MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2014 MITSUBISHI ELECTRIC CORPORATION Distributed in Apr 2014 No OBH684 REVISED EDITION A Distributed in Feb 2014 No OBH684 New publication effective Apr 2014 Made in Japan Specifications are subject to change without notice
62. unction 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 8 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 men tioned above NOTE 1 Make sure to release the failure mode recall function after 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 2 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 Re ag b e E ee 1 4 Nep opo i I j C I p OFF lt lt n 4 5 lt gt m be No beep Beeps MM No beep i Beeps Repeated cycle Repeated cycle Repeated cycle OBH584A 2 3 Outdoor unit failure mode table The left lamp of the OPERATION INDICATOR lamp 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 1 time flash Indoor outdoor communication receiving error Any signals from the inverter P C
63. up failure protection 12 time flash 2 5 seconds OFF Waveform of compressor current is distorted Reconnect compressor connector Refer to 10 5 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 minutes later eCheck refrigerant circuit and refrigerant amount Refer 10 5 Check of LEV High pressure Temperature indoor coil thermistor exceeds 158 F 70 C in HEAT mode Temperature defrost thermistor exceeds 158 F 70 C in COOL mode Check refrigerant circuit and refrigerant amount Check stop valve Fin temperature P C board temperature 7 time flash 2 5 seconds OFF Temperature of the fin temperature thermistor on the inverter P C board exceeds 167 187 75 86 C FH09 12 167 176 F 75 80 C FH15 or temperature of P C board temperature thermistor on the inverter P C board exceeds 162 185 F 72 85 C FH09 12 158 167 F 70 75 C FH15 eCheck around outdoor unit eCheck outdoor unit air passage Refer to 10 5 0 Check of outdoor fan motor Outdoor fan motor Outdoor fan has stopped 3 times ina row within 30 seconds after outdoor fan start up Refer 10 5 D Check of outdoor fan motor Refer to 10 5 Check of inverter P C
64. zontal 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 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 acc NS ss zd SO lt un Lead wiring Housing point Troubleshooting procedure 1 Check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality To make sure check how many times the OPERATION INDICATOR lamp is flashing on and off before starting service work 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 OBH584A en 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

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