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SERVICE MANUAL MUZ-A09NA MUZ-A09NA- MUZ

1. CN601 208 230V AC 60 Hz Input 7 2 9 I 9 QJ 1 J gt C804 _ 5 db 5 N REDS 5 Reo 88 RE7ARSTBRSTCRET DO Re02 3 01 RESA RESC REED g 000000000 AD A a 5 T ui 9 1
2. Output to drive outdoor fan motor Jumper wire for change Connecting wire with LEV GoGo ose in defrost setting JS power P C board connector 2 a 53 8 5 5 8 CN932 CN725 CN724 52635585 ATL 55 5 56 5 65 Front side of unit 2 18 22 Connector for indoor 3 EE 53 outdoor communication 89 93 601 LI 2 D J72 3 Defrost thermistor RT61 Fin temperature thermistor RT64 id Ambient temperature thermistor RT65 Discharge temperature thermistor RT62 Resistance kO 0 0 0 32 50 68 84 104 122 140 158 176 4 14 32 50 68 84 104 32 50 68 84 104 122 140 158 176 194 212 2 230 248 Temperature F Temperature F Temperature F 54 2 Power P C board MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA MUY A15NA MUY A17NA Back side of unit Varistor Varistor Varistor Front side of unit NR63 NR62 NR64 208 230V AC Tien MUZ 231 P V coil CN721 8 NE 208 230V AC aney
3. MSZ A09NA PSIG 420 88 400 5 PSIG pv 5 2 360 160 Indoor DB temperature F 86 2 o 155 2 340 5 3150 80 5 9145 S 320 5140 75 ee 33130 309 2125 70 a 6870 75 80 85 90 95 100 105 F 6870 75 80 85 90 95 100 105 F Outdoor ambient temperature Outdoor ambient temperature MSZ A12NA PSIG 809 460 86 2 of 74 PSIG 2 420 150 g es 145 380 12 cu o indoor DB temperature F 86 2 340 2130 5 8 8125 5 300 2120 75 5115 260 9110 70 105 220 100 95 180 90 6870 75 80 85 90 95 100 105 F 6870 75 80 85 90 95 100 105 F Outdoor ambient temperature Outdoor ambient temperature MSZ A15NA MSY A15NA PSIG 580 540 PSIG 500 86 5 75 135 5 460 130 CP 2 ar pe o 125 indoor DB temperati 89 exe 5 2 420 2120 80 D oe 9115 8 380 110 75 5 105 a ooo 340 9100 95 300 90 85 260 80 6870 75 80 85 90 95 100 105 F 6870 75 80 85 90 95 100 105 F Outdoor ambient temperature Outdoor ambient temperature MSZ A17NA
4. MSY A17NA PSIG 580 540 PSIG 2 500 8 9 8 7 135 S 460 awe 130 E sen 125 420 9 120 veo 115 Indoor DB temperature CF 86 9 380 2110 80 e 5105 340 5 100 75 95 70 300 90 85 260 80 6870 75 80 85 90 95 100 105 F 6870 75 80 85 90 95 100 105 F Outdoor ambient temperature Outdoor ambient temperature MSZ A24NA MSY A24NA PSIG 580 540 PSIG 2 500 130 125 ature F a DB temper 2 460 120 Indoor 86 5 o 115 420 2110 80 E 380 340 9 90 85 300 80 75 260 70 6870 75 80 85 90 95 100 105 F 6870 75 80 85 90 95 100 105 F Outdoor ambient temperature Outdoor ambient temperature 21 Heating Data is based on the condition of outdoor humidity 75 Air flow should be set to High speed Data is for heating operation without any frost MSZ A09NA PSIG 480 460 440 420 400 380 360 340 320 Condensing pressure 300 280 260 240 14 20 25 30 35 40 45 50 55 60 6570 F MSZ A12NA PSIG Outdoor ambient temperature 480 460 440 75 420
5. Symptom point Conditi Condition Correspondence Symp LEDi Red LED2 Vellow Abnormal point Condition M When IPM protection stop or lock protection stop is continuously Check the connection of the compressor connecting operate performed three times within 1 minute after the compressor gets wire 1 Lightning _ Twice Outdoor power system started or when converter protection stop or bus bar voltage Refer to 10 5 How to check inverter compressor protection stop is continuously performed three times within 3 Check the stop valve minutes after start up When a short circuit is detected in the thermistor during operation R T 2 Lightning 3 times peerage temperature when an open circuit is detected in the thermistor after 10 minutes Refer to 10 5 Check of outdoor thermistor ermistor of compressor start up Fin temperature ictor Lightning imas hermistor When a short or open circuit is detected in the thermistor during ROADS 3 p ion 0 m temperature operation Replace the outdoor electronic control P C board hermistor Ambient temperature When a short or open circuit is detected in the thermistor during hermistor operation h When a short circuit is detected in the thermistor during operation or Outdoor 1 when an open circuit is detected the thermistor afte
6. Releasing the failure mode recall function 4 Release the failure mode recall function by the following procedures OFF the power supply and turn it ON again Press RESET button of the remote controller Y Repair the defective parts Deleting the abnormal memorized condition CDAtter 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 Note1 Make sure to release the failure mode recall function once it s 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 Blinking pattern when the indoor unit is abnormal Blinking at 0 5 Blinking at 0 5 2 5 _ interval 2 5 _ interval gt _ Beeps Beeps Repeated cycle Repeated cycle Repeated cycle 3 Blinking pattern when the outdoor unit
7. Outdoor fan ON OFF motor 8 3 Relation between main sensor and actuator lt MUZ A09 12 15 17 gt Actuator Sensor Purpose Compressor R V coil Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Q Heating High pressure protection Q Defrost thermistor Cooling High pressure protection Q Heating Defrosting Q Fin temperature thermistor Protection Q Ambient temperature thermistor Cooling Low ambient temperature operation Q lt MUZ A24 gt Actuator Outdoor Indoor fan motor coil fan motor Sensor Purpose Compressor Discharge temperature thermistor Protection Indoor coil temperature thermistor Cooling Coil frost prevention Heating High pressure protection Defrost thermistor Defrosting Fin temperature thermistor Protection Outdoor heat exchanger temperature High pressure protection Ambient temperature thermistor _ Cooling Low ambient temperature operation 9 SERVICE FUNCTIONS MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA CHANGE IN DEFROST SETTING JS When the JS wire of the outdoor Inverter P C board is cut soldered the defrost finish temperature is changed Refer to 10 6 1 Defrost finish temperature Jumper wire MUZ A09 12NA MUZ A15 17NA solder
8. Check the inverter P C board Refer to 10 5 turn on the power supply CN931 Between D and Between 2 and Between and v Disconnect CN932 from outdoor electronic control P C board and Rotate the outdoor fan motor manually and measure the voltage of Fixed to either or OV DC A repeatedly Does the voltage between each terminal become 5V DC and 0V DC Yes v Yes Replace the outdoor DC fan motor Replace the outdoor electronic control P C board 47 No lt Does the outdoor fan motor rotates smoothly gt Inverter does not operate Check of power supply MUZ A09 12 15 17 15 17 Disconnect the connector CN61 between compressor and intelligent power module Turn ON power supply and press EMERGENCY OPERATION Rectify indoor outdoor switch connecting wire No Does the left of Is there voltage 230V AC eds between the indoor ae amp on the indoor uni terminal block 1 and electronic contro light up board Yes Is there voltage 280V 370V DC between DB61 and Yes Dose LED on the inverter Replace the inverter DB61 P C board light up or gt on the P C board inverter P C board flash Refer to 10 6 1 Refer to 10 6 1 Yes J If light up ok 22 14 280V 370V DC Check the electric
9. Yes Does the rush current Replace the power P C board limiting relay X64 work Yes properly Normally it Replace the inverter P C closes 1 second after board or the compressor outdoor unit power ON No Replace the power P C board Check other electric parts in the main circuit together in the case that the current limiting resistor is defective Outdoor unit does not operate at all or stops immediately due to overcurrent K Check of current limiting resistor MUZ A24 MUY A24 When the current limiting resistor is open the rush current limiting relay X64 may not work properly Is the resistance of current limiting Not Turn ON the power Replace the noise filter P C resistor R64A or R64B on the supply and press 27 1 d No board or the outdoor noise filter P C board normal EMERGENCY light up electronic control Normal resistance 5 5596 OPERATION switch eee baard Yes Replace the power board Does the rush current Yes 22 limiting relay X64 work electronic control properly board or power P C board or the compressor No Replace the noise filter P C board Check other electric parts in the main circuit together in the case that the current limiting resistor is defective 49 Heating Cooling does not work sufficiently 0 Check of LEV Expansion valve MUZ A09 12 15 17
10. 15 17 Turn ON th wer ly 22 controller gt This figures show about MSZ A09 12 15 17 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 in operation display section of the remote controller is displayed after 3 seconds 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 Expansion valve operates in full opening direction a MITSUBISHI ELECTRIC 1 Regardless of normal or abnormal a short beep is emitted once as the signal is received Do you feel the expansion valve vibrate on touching it Is LEV properly fixed to the Properly fix the LEV to the expansion valve expansion valve Measure each voltage between connector pins of CN724 on the inverter P C board 1 Pin Pin 2 Pin Pin 3 Pin Pin 4 Pin Is there about 3 5V AC between each NOTE Measure the voltage by an analog tester Does the resistance of LEV Yes have the characteristics Refer to 10 4 Replace the LEV No neplace the inverter P C board ves Replace the expansion valve 50 When cooling heat exchanger of non operating indoor
11. Compressor Measure the resistance between terminals using a tester Winding temperature 14 F 104 F Normal 0 390 0 490 Outdoor fan motor Linear expansion valve Measure the resistance between lead wires using a tester Part temperature 14 F 104 F Color of lead wire Normal RED BLK BLK WHT WHT RED 130 160 Measure the resistance using a tester Part temperature 14 F 104 F Normal 1 20kQ 1 55kQ Measure the resistance using a tester Part temperature 14 F 104 F Color of lead wire Normal WHT RED RED ORN YLW BRN BRN BLU 380 500 41 YLW BRN BLU 10 5 Troubleshooting flow When OPERATION INDICATOR lamp flashes 5 time Outdoor unit does not operate A How to check inverter compressor MUZ A09 12 15 17 _ MUY A15 17 Disconnect the connector CN61 between compressor and the intelligent power module IPM Y Check the voltage between terminals eem See 10 5 Check of open phase Are the voltages Check the resistance of the intelligent balanced gt power module pv See 10 5 Check of intelligent power module Yes ER Yes S the resistance Replace the inverter Check the 84 ases 2 infinite See 10 5 Check of compressor board No O se
12. 1 Ozone Destruction Parameter based on CFC 11 Global Warmth Parameter based on CO New Specification Current Specification The incompatible refrigeration oil easily separates from Since refrigerant and refrigeration oil are compatible each refrigerant and is in the upper layer inside the suction muffler refrigeration oil goes back to the compressor through the Raising position of the oil back hole enables to back the lower position oil back hole refrigeration oil of the upper layer to flow back to the compressor Suction muffler Suction muffler Compressor Compressor Oil back hole Compressor refrigeration oil Refrigerant refrigeration oil Refrigerant Conversion chart of refrigerant temperature and pressure R410A Saturated liquid pressure 22 4 14 32 50 68 86 104 122 140 F 1 Tools dedicated for the air conditioner with refrigerant The following tools are required for R410A refrigerant Some R22 tools can be substituted for R410A tools R410A tools Can R22 tools be used Description R410A has high pressures beyond the measurement range of existing gauges Hose material have been changed to improve the pressure resistance Dedicated for HFC refrigerant 1 4in and 3 8in Clamp bar hole has been enlarged to reinforce the spring strength in the tool Provided for flaring work to be used with R22 flare tool Provided to preve
13. 0 50 100 150 Hz 0 7750 100 150 2 0 77 50 100 150 Hz 0 50 100 150 The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor operational frequency of compressor 28 MUZ A17NA MUY A17NA MUZ A17NA Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 1 5 1 5 1 5 a e a o a Capacity correction factors 5 Input correction factors 5 Capacity correction factors 5 Input correction factors 5 e a 150 Hz 50 100 150 Hz 50 100 150 Hz 50 100 150 Hz The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor MUZ A24NA MUY A24NA MUZ A24NA Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 15 15 Capacity correction factors 5 Input correction factors 5 m ex 2 0 5 Input correction factors Capacity correction factors 150 Hz 100 150 Hz 0 50 100 150 Hz 50 100 150 Hz The operational frequency of compressor The poration frequency of compressor The operational frequency of compressor The operational frequency of compressor 7 7 TEST RUN OPERATION How to operate fixed frequency operation Press EMERGENCY OPERATION switch to COOL
14. Connecting wire with inverter P C board CN726 55 3 Outdoor electronic control P C board MUZ A24NA MUY A24NA Resistance Discharge temperature thermistor RT62 5 gt e 400 e 5 eo S 50 LED 1 68 84 104 122 140 176 194 122 212 230 248 Temperature F A 29 2 Se S9 9 e 88 8 5 gt 5 oie o 2011 19 18 1 180490 2918 1 aBseyosiq 2 2 35 o 5 oa SP 29 93 m 3g 5 o ZZ 33 54 a5 3 2 gS m g 5 o gt 200 Defrost thermistor RT61 Ambient temperature thermistor RT65 Fin temperature thermistor RT64 Outdoor heat exchanger temperature thermistor RT68 40 100 180 40 160 E X 140 x 120 70 Sj 100 S e 2 QD 8050 50 60 tc 40 40 20 30 0 20 32 50 68 84 104 122 140 158 176 Temperature F 10 0 2229 2729 4 14 32 10 20 30 0822 Temperature F po 22 gN I NM g s 228 og ENZ o oO es z lt 4 909 5 909
15. 3 Outdoor unit failure mode table MUZ A09 12 15 17NA MUY A15 17NA The left lamp of OPERATION INDICATOR lamp Indoor unit Abnormal point Failure mode protection LED indication Outdoor P C board Condition Correspondence 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 When it consecutively occurs 3 times that the compressor stops for overcurrent protection within 1 minute after stat up Reconnect connectors Refer to 10 5 How to check inverter compressor Check stop valve 3 time flash 2 5 seconds OFF Discharge temperature thermistor Defrost thermistor MUZ 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 When 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 4 time flash 2 5 seconds OFF Overcurrent 11 time flash 2 5 seconds OFF When 24A A09 12 26 5A A15 17 current flow into intelligent power module Reconnect compressor connector Refer to 10 5 How to check inverter compressor
16. Check stop valve Compressor synchronous abnormality Compressor start up failure protection 12 time flash 2 5 seconds OFF When waveform of compressor current is distorted Reconnect compressor connector Refer to 10 5 How to check inverter compressor 5 time flash 2 5 seconds OFF Discharge temperature When 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 refrigerant amount Refer to 10 5 D Check of LEV 6 time flash 2 5 seconds OFF High pressure When temperature of indoor coil thermistor exceeds 158 F 70 C in HEAT mode MUZ When defrost thermistor exceeds 158 F 70 C in COOL mode Check refrigerant circuit and refrigerant amount Check stop valve 7 time flash 2 5 seconds OFF Fin temperature P C board temperature 7 time flash 2 5 seconds OFF When temperature of fin temperature thermistor on the inverter P C board exceeds 180 82 A09 12 188 F 86 5 15 17 or temperature of board temperature thermistor on the inverter P C board exceeds 176 F 80 C Check around outdoor unit Check outdoor unit air passage to 10 5 D Check of outdoor fan motor 8 time flash 2 5 seconds OFF Outdoor fan motor When outdoor fan has stopped
17. MSY A15NA Item MSZ A17NA MSY A17NA Capacity Cooling 1 15 000 3 100 15 000 15 000 3 100 15 000 16 200 3 100 16 200 16 200 3 100 16 200 Rated Minimum Maximum Heating 47 18 000 3 400 20 900 20 100 3 400 20 900 Capacity Rated Heating 17 13 000 13 000 Power consumption Cooling 1 1 690 210 1 690 1 690 210 1 690 2 070 210 2 070 2 070 210 2 070 Rated Minimum Maximum Heating 47 1 790 250 2 330 2 150 250 2 330 Power consumption Rated Heating 17 1 740 1 740 EER SEER Cooling 8 9 16 0 89 160 78 16 0 78 16 0 HSPF IV V 4 Heating 82 6 7 82 6 7 COP Heating 2 2 95 2 74 OUTDOOR UNIT MODEL MUZ A15NA MUY A15NA MUZ A17NA MUY A17NA External finish Munsell 3Y 7 8 1 1 Power supply 208 2 30 1 60 V phase Hz A Max fuse size time delay 15 Min circuit ampacity A 14 Fan motor F L A 0 52 Model SNB1 30FPDH Winding resistance at 68 F Q 0 45 Compressor RLA 10 1 L R A 12 0 control Liner expansion valve 1 Cooling 50 52 Sound level dB A Heating 53 Defrost method Reverse cycle 31 1 2 Dimensions D 11 1 4 H 21 5 8 Weight 88 REMOTE CONTROLLER Wireless type Control
18. No between outdoor terminal block S2 No and S3 Confirmation of serial signal Yes Is there rated voltage between indoor terminal block S1 and S2 No lt Confirmation of power voltage gt Yes Is there any error of the indoor outdoor connecting wire such as the damage of the wire intermediate connection poor contact to the terminal block No Replace the indoor outdoor connecting wire Replace the indoor electronic control P C board Be sure to release the failure mode recall function after checking Refer to indoor unit service manual 52 Electromagnetic noise enters into TV sets or radios No Is the unit earthed gt Earth the unit Yes Is the distance between the Extend the distance between ws ig Be bs Yes the antennas and the indoor distance between the n ebd the antennas and antennas and the outdoor the outdoor unit unit within 9 91ft ne Is the distance between the TV sets or radios and the indoor unit within 3 28ft or is the distance between the TV sets or radios and the outdoor unit within 9 91ft Yes Extend the distance between the TV sets and or radios and the indoor unit or the TV sets or radios and the outdoor unit No Are the antennas damaged Is the coaxial cable damaged Is there any poor contact in the antenna wiring Replace or repair the antenna Repl
19. SHF 0 63 Input 2 88 Rated frequency 110 Electrical circuit Indoor unit MSZ A24NA MSY A24NA Power supply V phase Hz 208 230 1 60 Input 0 053 Fan motor current 0 52 0 47 Aux heater current Outdoor unit MUZ A24NA MUY A24NA MUZ A24NA Power supply V phase Hz 208 230 1 60 Input 2 827 2 297 Comp current 12 81 11 59 11 10 10 04 Fan motor current Refrigerant circuit Condensing pressure Suction pressure Discharge temperature Condensing temperature Suction temperature Comp shell bottom temp Ref pipe length Refrigerant charge R410A 80 Intake air temperature 67 56 Discharge air temperature 55 Fan speed High 1 310 Airflow High 385 Wet 95 Intake air temperature Fan speed Airflow 26 7 5 OPERATING RANGE 1 POWER SUPPLY Rated voltage Guaranteed Voltage Min 198V 208V 230V 253V Outdoor unit 208 230V 1phase 60Hz 2 OPERATION Intake air Indoor Outdoor temperature Function Condition Standard temperature Maximum temperature Cooling Minimum temperature Maximum humidity Standard temperature Heating Maximum temperature Minimum temperature 27 7 6 Capacity an
20. z 4 DA792 5 12804 9 LASS Las PLAS LALA for indoor 5 10V DC 4 Noise filter P C board MUZ A24NA MUY A24NA CN901 To electronic CN902 CN903 control To power To power board board board 208 230V AC 60Hz Input MUZ CN912 coil 208 230V AC 60Hz Output 208 230V AC 60Hz Output 208 230V AC 60Hz Output NR64 VARISTOR F64 FUSE F911 FUSE 2A 250V 1A 250V 57 5 Outdoor power board MUZ A24NA MUY A24NA Connect to the compressor Voltage among phases 5V to 180V gt PPS lt Bcoonors D 26 T sa 9 eka CB1 a 5 om Ne DE S 294 370V DC Output 93 Red 2 9 u LD2 gt coe Z 5 5 S lt lt 5m CN PM 11 RGT3N020 e 5 1 QS lt gt Connect to o amp R o7 CED lt 9 080 5 E EE RS e e Ye 0000000000 reception eY 6000000000 0000 o BOO From m electronic 5 a 90
21. 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 After checking the above consult the service representative 53 10 6 Test point diagram and voltage 1 Inverter P C board MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA MUY A15NA MUY A17NA Back side of unit 208 230V AC Smoothing capacitor Smoothing capacitor Smoothing capacitor DB61 280V 370V C63C C63B C63A DC lt T mm mm n i CUN E LED monitor lamp 5 325 Output to we 28 drive o TR mum 6 BIE ce 011 i 42 25 LDW KON 29 E 2 o Spo LDV 29 5 LDU Ho e 95 8
22. 60 seconds to 5minutes refrigerant circuit defective 5 minutes or more normal Check of open phase MUZ A09 12 15 17 MUY A15 17 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 balance of voltage between the terminals Output voltage 115V lt lt Operation method gt gt Inverter P C board Start cooling or heating operation by pressing EMERGENCY OPERATION Parts side switch on the indoor unit TEST RUN OPERATION Refer to 7 7 lt lt Measurement point gt gt LED Flashing at 3 points WHT V EE eee A Measure AC voltage between WHT V RED W the lead wires at 3 points 9 time flash NOTE 1 Output voltage varies according to power supply voltage Sososososo08080 2 Measure the voltage by analog type tester 3 During this check LED of inverter P C board flashes 9 times je emt 2 5 second OFF Check of intelligent power module MUZ A09 12 15 17 MUY A15 17 Ge Measure the resistance between the terminals on the intelligent ohmmeter indication power module Measurement point gt gt at 6 points V BLK WHT WHT BLK Normal BLK RED RED BLK WHT RED RED WHT o lt lt Judgement gt gt 2 Infinite Q Normal Y g ILM l e Abnorm
23. 70 400 65 380 360 340 58 2 Condensing pressure 320 300 280 260 240 14 20 25 30 3 MSZ A15NA PSIG 620 Outdoor ambient temperature 580 540 500 460 an oxo 420 or 380 340 300 2 Condensing pressure 260 220 180 140 100 5 40 45 50 55 60 6570 F 75 70 65 14 20 25 30 35 40 45 50 55 60 6570 F Outdoor ambient temperature PSIG 70 60 50 40 30 20 110 00 NS Suction pressure 90 8 2 80 70 60 14 PSIG 75 70 65 20 25 30 35 40 45 50 55 60 65 70 F Outdoor ambient temperature 170 75 160 150 70 65 140 A o Suction pressure 5 58Hz 5 14 PSIG 60 20 25 30 35 40 45 50 55 60 65 70 F Outdoor ambient temperature 50 40 30 20 A 110 00 90 Suction pressure 80 5
24. OUTDOOR UNIT MODEL MUZ A09NA MUZ A12NA External finish Munsell 3Y 7 8 1 1 Power supply 208 230 1 60 V phase Hz A Max fuse size time delay 15 Min circuit ampacity A 12 Fan motor F L A 0 52 Model KNBO92FPAH Winding resistance at 68 F 0 49 Compressor RLA 7 8 L R A 9 2 Refrigerant control Liner expansion valve Sound level 1 dB A 48 Defrost method Reverse cycle in 31 1 2 Dimensions in 11 1 4 in 21 5 8 Weight 82 REMOTE CONTROLLER Wireless type Control voltage by built in transformer 12 24V DC REFRIGERANT PIPING Not supplied Refrigerant pipe size Liquid 1 4 0 0315 Min wall thickness Gas 3 8 0 0315 Indoor Flared Connection method Outdoor Between the indoor Height difference amp outdoor units Piping length Refrigerant charge R410A Refrigerating oil Model NOTE Test conditions are based on ARI 210 240 heating 320 022 3 amp 1 Rating conditions cooling Indoor 80 FDB 67 FWB Outdoor 95 FDB 75 FWB Rated frequency A09 50Hz 12 heating Indoor 70 FDB 60 FWB Outdoor 47 FDB 43 FWB Rated frequency 09 61 2 12 76 Indoor 70 FDB 60 FWB Outdoor 17 FDB 15 FWB Maximum frequency A09 71Hz A12 76Hz MSZ A15NA
25. Wet bulb Dry bulb Wet bulb SEER Cooling A Cooling Steady State at rated compressor Speed 80 67 95 75 B 2 Cooling Steady State at rated compressor Speed 80 67 82 65 B 1 Cooling Steady State at minimum compressor Speed 80 67 82 65 Low ambient Cooling Steady State at minimum compressor Speed 80 67 67 53 5 Intermediate Cooling Steady State At Intermediate compressor 5 80 67 87 69 HSPF Heating Standard Rating Heating at rated compressor Speed 70 60 47 43 Low temperature Heating at rated compressor Speed 70 60 17 15 Max temperature Heating at minimum compressor Speed 70 60 62 High temperature Heating at minimum compressor Speed 70 60 47 Frost Accumulation at rated compressor Speed 70 60 35 Frost Accumulation at Intermediate compressor Speed 3 amp 5 At Intermediate compressor Speed Cooling rated compressor speed minimum compressor speed 3 minimum compressor speed 70 60 35 4 OUTLINES AND DIMENSIONS 2 MUZ A12NA MUZ A15NA Unit inch MUZ A17NA MUY A15NA MUY A17NA REQUIRED SPACE Basically open 4inch or more without any obstruction in front x
26. 03909 2 9 83404 TEENI QNO 3 BE gt 01 3 HV0H 7274 d3l8H3A z 2863 1 m 5 Mit Di 008 69 18 2592 8292 veg A PT 1 4 Or wal ral 981 E91 HT rvi eal spud 5 13103 103800 00 121800 AI 91133810 z aseud 12 00 DONI 0 11 MUY A15NA MUY A17NA YOLSTWYSHL JWL 1109 NOISNYdX3 VX 140151 4431 98 810 2313 10004 H3MOd 13911131 06621 7441 u3AHU03SNVHI ONTHOLIMS TOBL YOLSTWYSHL 1508430 39IA30 83404 IN39ITI3INT 10891 HOLSTSNVYL H3M0d ONTHOLIMS 1288 YOLSTUVA YIAN EJAN 21 3503 106 T084 2018 281 181 HOLOW 3 83840587 3985 19750 30151534 NILIWI 1 LN3HHKO GF IH 798 80553844092 310001 30010 8980 1980 40151538 9N1123130 183980 1288 7198 1109 9 881991 30119949 ONIHLOOWS 294 1 HOLSIWYSHL IN3ISAV 9918 801534 191 334035941 IN3HUDO _ 84218421 10845 1 5 WYN 108 5 201290009 0
27. 15 100 01 943 100 153 S E 1 8 Y D HOLSTWYFHL dW INJIAWY 5918 Y0LSIWHJH1 4831 NIJ FATWA NOISNVdX3 7914 31000 YJMOd 1N391T131NI 2691 Wal 1109 WA 9 7510 WOISINHJHL dW3L 510 2918 321840 3309 LNJJITIJLNI 144 79 9X 0151 1504330 1914 A052 WST 3513 1064 1084 HAWYOASNVUL SNTHOLIMS 1081 HOLSTUVA VSUN 9HN EL 3504 Ma HOILSTSNVHI H3MOd SNIHOLIMS 16881 HOLOW NVA dA 4394058 39415 19750 39018 cal 181 u0553HdN02 JINGOW 30010 8980 1980 40151538 9NILINIT 1N3HH O 8 98 VID 1109 IWI 91 491 HOLTOVdVO DNIHLOOWS 290 0690 VEO 80151538 91193130 1 9 1984 198 3019938 191 YSWHOISNYHL LNSHYND 182 1901 JAVN 108 5 108 5 5 cis con To STE i tE lt 5
28. 2222 5 BB Ju BA BB 75 22 A SAIS SLS SAIS KITS SS 7 5 717 SS 6 16 15 13 E Ss 7 8 9 10 11 12 70 MUY A24NA MUY A24NA 3 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration Part Part Name Symbol in Wiring Diagram Q ty unit MUZ A24NA MUY A24NA Remarks E02 819 297 TOP PANEL 1 E02 A53 630 OUTDOOR HEAT EXCHANGER E02 58 630 OUTDOOR HEAT EXCHANGER E02 A58 301 OUTDOOR FAN MOTOR RCO0J60 E02 851 501 PROPELLER E02 819 232 CABINET E02 819 521 FAN GUARD E02 819 009 HANDLE E02 851 290 BASE NOAR N 02 065 506 COMPRESSOR RUBBER SET 3RUBBERS SET E02 A56 900 COMPRESSOR SNB130FPDH E02 A58 661 STOP VALVE GAS 65 8 02 821 662 STOP VALVE LIQUID 1 4 E02 A49 641 SERVICE PORT 1PC SET E02 851 493 EXPANSION VALVE COIL E02 851 640 EXPANSION VALVE ES E02 A58 490 R V COIL E02 A56 961 4 WAY VALVE E02 819 650 VALVE COVER E02 819 245 SERVICE PANEL E02 935 374 TERMINAL BLOCK E02 A53 374 TERMINAL BLOCK E02 851 337 REACTOR 02 58 444 NOISE FILTER BOARD E02 A53 444
29. MC MUZ A09 12 p d MUY A15 17 Outdoor fan motor MF Measure the resistance between the terminals with a tester Part temperature 14 F 104 F Color of the lead wire Normal WHT BLK 310 410 BLK RED 310 410 RED WHT 310 410 R V 2154 MUZ Measure the resistance between the terminals with a tester Part temperature 14 F 104 F Normal 1 20 KQ 1 55 kQ Expansion valve coil LEV Measure the resistance with a tester Part temperature 14 F 104 Color of the lead wire Normal WHT RED RED ORN YLW BRN 2 BRN BLU WHTISI REDO 3 ORNE BLUB 40 MUZ A24NA Part name MUY A24NA Check method and criterion Defrost thermistor RT61 MUZ 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 3 Outdoor electronic control P C board the chart of thermistor Discharge temperature 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 3 Outdoor electronic control P C board the chart of thermistor
30. detected in the current sensor during compressor operating Current sensor protection stop is continuously performed twice Replace the power board Zero cross detecting circuit 5 times When zero cross signal cannot be detected while the compressor is operating The protection stop of the zero cross detecting circuit is continuously performed 10 times Check the connecting wire among electronic control P C board noise filter P C board and power board Converter 5 times When a failure is detected in the operation of the converter during operation Bus bar voltage 1 5 times When the bus bar voltage exceeds 400 or falls to 200V or below during compressor operating Bus bar voltage 2 Even if this protection stop is performed continuously three times it does not mean the abnormality in outdoor power System 6 times When the bus bar voltage exceeds 400V or falls to 50V or below during compressor operating Replace the power board NOTE Blinking patterns of this mode differ from the ones of Troubleshooting check table 10 3 36 10 3 Troubleshooting check table MUZ A09 12 15 17NA MUY A15 17NA LED indication Symptom Abnormal point Condition Condition Correspondence 1 time flash every Outdoor power 2 5 seconds system Outdoor unit does not operate When it consecutively occurs 3 times that the c
31. 67 MSY A17NA 63 71 MSZ A24NA 67 MSY A24NA 63 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 on 80 F of indoor intake air DB temperature 2 COOLING CAPACITY CORRECTIONS Refrigerant piping length one way ft Model 25 std 40 65 MSZ A09 12 15 17NA MSY A15 17NA MSZ A24NA MSY A24NA 17 3 HEATING CAPACITY Indoor air Outdoor intake air WB temperature F IDB 35 43 75 MSZ A09NA 70 65 75 MSZ A12NA 70 65 75 MSZ A15NA 70 65 75 MSZ A17NA 70 65 75 MSZ A24NA 70 65 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 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 2 The compressor starts up The operational frequency of the compressor The fan speed of the indoor unit is High This operation continues for 30minutes In order to relea
32. 8 1 1 Power supply V phase Hz 208 230 1 60 Max fuse size time delay A 20 Min circuit ampacity A 17 Fan motor F L A 0 93 Model SNB130FPDH Winding resistance at 68 F 0 45 Compressor RLA 10 1 L R A 16 0 Refrigerant control Liner expansion valve Sound level 1 55 Defrost method Reverse cycle 33 1 16 D Dimensions 13 33 7 16 Weight 128 REMOTE CONTROLLER Wireless type Control voltage by built in transformer 12 24VDC REFRIGERANT PIPING Not supplied Refrigerant pipe size Liquid 1 4 0 0315 Min wall thickness Gas 5 8 0 0394 Connection method Indoor Flared Outdoor Flared Between the indoor Height difference 50 amp outdoor units Piping length 100 Refrigerant charge R410A 4lb Refrigerating oil Model NOTE Test conditions are based on ARI 210 240 450 NE022 441 Rating conditions cooling Indoor 80 FDB 67 Outdoor 95 FDB 75 Rated frequency 110Hz heating Indoor 70 FDB 60 FWB Outdoor 47 FDB 43 FWB Rated frequency 101 2 2 heating Indoor 70 FDB 60 FWB Outdoor 17 FDB 15 FWB Maximum frequency 108Hz Test condition 3 4 23 78 Mode Test Indoor air condition Unit F Outdoor air condition Dry bulb
33. C BOARD E12 B13 450 OUTDOOR ELECTRONIC CONTROL P C BOARD E12 A58 233 BACK PANEL OUT E12 817 009 HANDLE E12 851 515 MOTOR SUPPORT E12 851 936 CAPILLARY TUBE TAPER PIPE 77 13 OPTIONAL PARTS 13 1 DRAIN SOCKET Model Parts No MUZ A09 12 15 17NA MUY A15 17NA MAC 851DS 13 2 DRAIN SOCKET ASSEMBLY Model Parts No MUZ A24NA MUY A24NA Copyright 2006 MITSUBISHI ELECTRIC ENGINEERING CO LTD MAC 811DS 2 MITSUBISHI ELECTRIC CORPORATION Distributed in Apr 2006 No OB451 7 New publication effective Apr 2006 Specifications subject to change without notice MITSUBISHI ELECTRIC HVAC Advanced Products Division 3400 Lawrenceville Suwanee Road e Suwanee Georgia 30024 Toll Free 800 433 4822 e Toll Free Fax 800 889 9904 www mrslim com Specifications are subject to change without notice
34. Disconnect the power supply wire and indoor outdoor con necting wire 6 Remove the screws fixing the top panel See Photo 1 7 Remove the top panel See Photo 1 8 Remove the screws fixing the cabinet 9 10 1 3 4 5 Remove the cabinet Remove the screws fixing the back panel 1 Remove the back panel Photo 2 Screw of the conduit cover Conduit cover Conduit plate Photo 1 Screws of the Screw of the cabinet Screws of the top panel Screws of the cabinet Screw of the service panel Service panel 59 OPERATING PROCEDURE 2 Removing the inverter assembly inverter P C board and power P C board 1 Remove the top panel cabinet and service panel Refer to 1 2 Disconnect the power supply and indoor outdoor connecting wire and remove the back panel Refer to 1 3 Disconnect the ground wires See Photo 3 the lead wire to the reactor and the following connectors lt Power P C board gt CN721 4 way valve coil Inverter P C board gt CN931 CN932 Fan motor CN641 Defrost thermistor and discharge temperature ther mistor CN643 Ambient temperature thermistor CN724 LEV Remove the compressor connector CN61 Remove the screws fixing the relay panel See Photo 3 Remove the inverter assembly See Photo 3 Disconnect all connectors and lead wires on the inverter P C board See Photo 4 8 Remove the inv
35. E12 56 661 STOP VALVE GAS 01 2 E12 927 662 5 VALVE LIQUID 1 4 E12 A49 245 SERVICE PANEL E12 A54 233 BACK PANEL E12 A54 640 EXPANSION VALVE E12 927 493 EXPANSION VALVE COIL E12 A56 961 4 WAY VALVE E12 A54 961 4 WAY VALVE E12 929 523 CONDENSER NET E12 A54 293 SEPARATOR E12 929 515 MOTOR SUPPORT E12 927 297 TOP PANEL E12 A54 630 OUTDOOR HEAT EXCHANGER E12 A56 630 OUTDOOR HEAT EXCHANGER E12 A51 630 OUTDOOR HEAT EXCHANGER E12 A54 301 OUTDOOR FAN MOTOR RCO0J50 E12 A49 641 SERVICE PORT Ipe SET E12 735 936 CAPILLARY TUBE 92018 10 0 071 G 0 0 G OO G 0 G 0 O O G 1G 10100100 9 73 MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA MUY A15NA MUY A17NA 2 OUTDOOR UNIT ELECTRICAL PARTS 74 MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA MUY A15NA MUY A17NA 2 OUTDOOR UNIT ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration RoHS Part No Part Name Q ty unit Symbol in Wiring MUZ A MUY A Diagram 12NA 15NA U1 U1 15NA 17NA Remarks E12 838 337 REACTOR L61 E12 A54 444 POWER P C BOARD E12 A54 490 R V COIL 2184 E12 927 306 THERMISTOR SET RT61 RT62 DEFROST DISCHARGE E12 927 308
36. If flash refer to parts in main circuit 10 3 Inverter P C board Solder side Outdoor unit does not operate LED display display OFF Check of power supply MUZ A24 MUY A24 creck the connecting of parts of main power supply Turn on power supply v Is there voltage of 208 230V AC in the No power supply terminal block Check the power supply cable Yes Is the output voltage from the noise No Replace the noise filter board 208 230V AC filler P C board Yes Is the input voltage to the power board Replace the reactor 208 230V AC Replace the reactor 1 Yes Is the input voltage to the outdoor electronic control P C board 294 325V DC Replace the power board Yes Replace the outdoor electronic control P C board 48 Outdoor unit does not operate at all or stops immediately due to overcurrent K Check of current limiting resistor MUZ A09 12 15 17 MUY A15 17 When the current limiting resistor is open the rush current limiting relay X64 may not work properly Is the resistance of current limiting Turn ON the power Yes No Replace the power P C resistor R64A or R64B on the supply and press Does LED on the inverter power board normal EMERGENCY P C board light up board or the inverter P C Normal resistance 5 5 OPERATION switch board
37. Q and thermistor Cause is poor except RT64 contact In case that Ambient RT64 is temperature thermistor RT65 abnormal replace the Measure the resistance between CN643 and inverter P C board since RT64 is combined with the inverter P C board 44 When OPERATION INDICATOR lamp flashes 6 time When thermistor is abnormal Check of outdoor thermistors MUZ A24 MUY A24 Disconnect the connector in the outdoor electronic control P C board or the outdoor power board Yes see below table and measure the resistance of thermistor Is the thermistor normal Refer to 10 6 3 No Reconnect the connector CN661 on the outdoor electronic control board and CN3 on the power board and disconnect the lead wire leading to the compressor 3 minutes after turning on the power supply start EMERGENCY OPERATION Does the unit operate for 10 minutes or more without Replace the outdoor electronic showing thermistor abnormality control P C board Yes Symbol Connector Pin No Defrost MUZ Between CN661 pin1 and pin2 Discharge temperature Between CN661 pin3 and pin4 Replace the thermistor The outdoor electronic control P C board Outdoor heat exchanger temperature Between CN661 pin7 and pin8 Ambient temperature Between CN663 pin1 and pin2 Fin temperature Between pin1 and 2 The outdoor power board Check of R
38. the failure mode recall function Release the failure mode recall function by the following procedures OFF the power supply and turn it ON again Release the failure mode recall function according Press RESET button of the remote controller to the left mentioned procedure Repair the defective parts Deleting the abnormal memorized condition 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 Note1 Make sure to release the failure mode recall function once it s 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 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 gt SLS OFF No beep Besos i Repeated cycle Repeated cycle Repeated cycle 33
39. voltage by built in transformer 12 24V DC REFRIGERANT PIPING Not supplied Refrigerant pipe size Liquid 1 4 0 0315 Min wall thickness Gas 1 2 0 0315 Indoor FI ared Connection method Outdoor Between the indoor Height difference amp outdoor units Piping length Refrigerant charge R410A Refrigerating oil Model NOTE Test conditions are based on ARI 210 240 450 022 1 Rating conditions cooling Indoor 80 208 6 Outdoor 95 FDB 75 FWB Rated frequency 15 77 2 17 89 2 heating Indoor 70 FDB 60 FWB Outdoor 47 FDB 43 FWB Rated frequency A15 78Hz A17 88Hz Indoor 70 FDB 60 FWB Outdoor 17 15 FWB Maximum frequency A15 93Hz A17 93Hz Item MSZ A24NA MSY A24NA Capacity Cooling 1 22 000 4 400 22 000 22 000 4 400 22 000 Rated Minimum Maximum Heating 47 23 200 3 600 24 400 Capacity Rated Heating 17 15 200 E Power consumption Cooling 1 2 880 290 2 880 2 880 290 2 880 Rated Minimum Maximum Heating 47 2 350 260 2 570 Power consumption Rated Heating 17 1 960 am EER 1 SEER 3 Cooling HSPF 4 Heating 7 6 16 0 7 6 16 0 8 2 6 7 COP Heating 7 2 89 OUTDOOR UNIT MODEL MUZ A24NA MUY A24NA External finish Munsell 3Y 7
40. 0 55 60 6570 F Outdoor ambient temperature 7 4 STANDARD OPERATION DATA Model MSZ A09NA MSZ A12NA Item Cooling Heating Cooling Heating Capacity 9 000 10 900 12 000 13 600 SHF 0 71 0 70 Input 0 690 1 170 1 160 Rated frequency 50 76 76 Electrical circuit Indoor unit MSZ A09NA MSZ A12NA Power supply V phase Hz 208 230 1 60 208 230 1 60 Input 0 016 0 021 Fan motor current 0 18 0 16 0 23 0 21 Aux heater current Outdoor unit MUZ A09NA MUZ A12NA Power supply V phase Hz 208 230 1 60 208 230 1 60 Input 0 674 0 844 1 149 1 139 Comp current 2 80 2 53 3 63 3 28 5 08 4 59 5 03 4 54 Fan motor current 0 37 0 34 0 37 0 34 Refrigerant circuit Condensing pressure Suction pressure Discharge temperature Condensing temperature Suction temperature Comp shell bottom temp Ref pipe length Refrigerant charge R410A Indoor unit 80 80 Intake air temperature 67 67 57 56 Discharge air temperature 56 54 Fan speed High 1 080 1 220 Airflow High 275 Wet 318 Wet Outdoor unit 95 95 Intake air temperature Fan speed Airflow 24 Model MSZ A15NA MSY A15
41. 0000067 66 X 2 299 9 5 ps aje Pci oar LD5 106 CN5 J 5V DC pulse wave CN3 CN5 Fin temperature thermistor RT64 Primary current detection Connect to the noise filter CN2 Connect to the controller board 1 5 Signal transmission To electronic control P C board 5V DC pulse wave 2 5 Zero cross signal 3 4 Not used 4 6 5 15V 7 5 15V 58 11 DISASSEMBLY INSTRUCTIONS lt Terminal with locking mechanism Detaching points gt 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 Slide the sleeve pushing the locking lever 11 1 MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA MUY A15NA MUY A17NA Pull the terminal while 2 The terminal with this connector has the locking mechanism Hold the sleeve and pull out the terminal slowly Connector OPERATING PROCEDURE PHOTOS 1 Removing the cabinet 1 Remove the screw fixing the service panel See Photo 1 2 Pull down the service panel and remove it See Photo 1 Remove the screws fixing the conduit cover See Photo 2 Remove the conduit cover See Photo 2
42. 15NA MUZ A17NA MUY A15NA MUY A17NA 1 OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration Part Symbol in Wiring Diagram Q ty unit MUZ MUY 09 12 A15NA A17NA A15NA A17NA Remarks E02 927 232 CABINET 1 1 1 1 1 1 E02 927 521 GRILLE E02 927 501 PROPELLER E02 927 290 BASE 1 1 1 1 1 1 1 1 1 1 1 1 E02 A54 900 COMPRESSOR 092 02 56 900 COMPRESSOR SNB130FPDH E02 065 506 COMPRESSOR RUBBER SET 3RUBBERS SET E02 A54 661 STOP VALVE GAS E02 56 661 STOP VALVE GAS E02 927 662 STOP VALVE LIQUID joo 245 SERVICE PANEL 233 BACK PANEL 640 EXPANSION VALVE 493 EXPANSION VALVE COIL 961 4 WAY VALVE 961 4 WAY VALVE 523 CONDENSER NET 293 SEPARATOR 515 MOTOR SUPPORT 297 TOP PANEL 630 OUTDOOR HEAT EXCHANGER 630 OUTDOOR HEAT EXCHANGER 630 OUTDOOR HEAT EXCHANGER 301 OUTDOOR FAN MOTOR RCOJ50 641 SERVICE PORT 1pc SET CAPILLARY TUBE 67 0 118 X I D 0 071 23 5 8 MUZ A09NA MUZ A12NA
43. 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 9 time flash 2 5 seconds OFF Nonvolatile memory data 5 time flash 2 5 seconds OFF When nonvolatile memory data cannot be read properly Replace the inverter P C board 10 time flash 2 5 seconds OFF Discharge temperature When temperature of discharge tempe rature thermistor has been 122 F 50 C or less for 20 minutes Refer to 10 5 D Check of LEV Check refrigerant circuit and refrigerant amount 11 time flash 2 5 seconds OFF DC voltage 8 time flash 2 5 seconds OFF When DC voltage of inverter cannot be detected normally Each phase current of compressor 9 time flash 2 5 seconds OFF When each phase current of compre ssor 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 When 24A A09 12 26 5A A15 17 current flow into intelligent power module IPM When the open phase operation of compressor is detected When the interphase short out occurs in the output of the intelligent power module IPM When the compressor winding shorts out Reconnect compressor connector Refer to 10 5 How to check inverter compressor 14 time flash 2 5 seconds OFF Out
44. 383 385 585 9 lt 5 lt lt S zt oO 5 aa lt ae ons Zuun SES ol lt lt 2114 72 LED 2 CN801 294V DC 370V DC Input F801 FUSE 3 15A 250V 9 exeo 6
45. 4NA Airflow 431CFM o ER N Total capacity X10 Btu h Total power consumption 715 25 35 45 55 Outdoor intake air WB temperature F 19 MSZ A15NA MSY A15NA SHF at rating condition 0 65 Airflow 342CFM 22 Indoor r i z take Wi 85 18 Lt temper 5 8 ture F 71 5 67 10 63 2 22 8 C 71 5 WB 67 2 Nd ndoof make 21 63 5 1 6 gt 1 4 12 o zi 65 75 85 95 105 115 Outdoor intake air DB temperature F Airflow 381CFM 65 24 70 22 ie 75 gt ex 99 82 18 eat gm 2 So oo i gt 10 5 oF 2 ve 75 19 gere 7 Jew 65 7 scd ee 8848 2 1 5 amp 14 5 1 3 i 15 25 35 45 55 Outdoor intake air WB temperature F 7 3 Condensing pressure Cooling Data is based on the condition of indoor humidity 50 Air flow should be set to High speed
46. 8 83404 1N3OIT131NI 0 62H 401515341 158 61 3514 1084 YAWYOISNVUL ONIHOLIIMS 1081 8311081 03 8012 4 U3MOd 944 A0S2 Wel 3814 794 39018 lvVNIWH3I 981 0151 79UN YAWYOISNVYEL IN3HHf2 1919 39018 lvNIWH3I 8 114 3510 YAWYOISNVYL 1 384120 7719 301515318 40109 0113 4 ONIHIOUNS E T82 108445 1O8WAS 1084 5 WIM SNTLOANNOO 8919 2918 9914 LINN HOOQNT 52 20 014 118 0120 ONT LOANNOD 85 _ HOOONT 1014 11 aseyd SAUTA INTLIINNOJ LINN Y000NI OL 1108 aseud T 1065 8006 Alddfl 4309 14 6 REFRIGERANT SYSTEM DIAGRAM MUZ A09NA MUZ A15NA MUY A15NA Unit inch MUZ A12NA MUZ A17NA MUY A17NA Refrigerant pipe 43 8 MUZ A09 12 1 2 MUZ A15 17 MUY A15 17 with heat insulator 4 way valve d Muffler 4 Stop valve with service So Outdoor Flared connection Discharge heat temperature exchanger thermistor Ambient temperature thermistor RT65 Defrost thermistor RT61 Capillary tube 0 118 0 071 23 5 8 I 93 0 x 1 8 600 Strainer Flared connection Expansion 100 valve R V coil Muter heating ON gt l cooling OFF aie a Refrigerant pipe 1 4 w
47. 8Hz 70 60 50 14 22 75 70 65 20 25 30 35 40 45 50 55 60 65 70 F Outdoor ambient temperature MSZ A17NA PSIG Condensing pressure MSZ A24NA PSIG Condensing pressure 620 580 540 500 460 420 380 340 300 260 220 180 140 100 2 75 70 65 14 20 25 30 35 40 45 50 55 60 6570 F 460 440 420 400 380 360 340 320 300 280 260 240 220 200 Outdoor ambient temperature 75 70 65 58 2 14 20 25 30 35 40 45 50 55 60 6570 F Outdoor ambient temperature PSIG 160 150 140 130 ee 120 o 100 Suction pressure o 58Hz o o a o 14 PSIG 75 70 65 20 25 30 35 40 45 50 55 60 6570 F Outdoor ambient temperature 160 150 140 75 65 130 120 o o o Suction pressure 5 eo 5 8 2 o o a o 14 23 20 25 30 35 40 45 5
48. 919 91 9418 32014 Puwa 10945 TT B T 3 BE UR E ERES ere Sea ne ne PIATE 10d SPELT mum lt 5 03908 7274 HIMOd ALUO 85101210002 190002 95072 Ng 21949 POND 142 TOON 2 11314145 10 BUIJIA AQT Y 21112818 JTUN 1OOPUI 8l 4 2 0 Jaja BULJIM 21111818 2882 quvod J d 33183A 8918 j00pU ayy 110 71 153100 seyd 2 802 5 8310 1234009 NT 48 019 123402 1109 9544 MEL SIUTA 9NLLO3NNOD EOOCNI 0 mg E een TAM 8794 12 MUZ A24NA AV YAWYOISNVUL 2 39018 IWNIW 39018 1100 1109 01043105 3A1VA 9NISH3A3U 7510 103991109 CO 2019 18016281 a RIIPUL SIOUAS C Plats 104 510 2npU02 18040295070 1215188 10 WEIGRTP 1118 91212918 IUN JOOPUT 9 0 29492 21289 APIS JOOPUT 34 SILON YOLSIWYSHL dWAL 9914 JATWA NOISNVdX3 431 YOLSIWYSHL 4431 13 7918 uo19vdu 134
49. 9NA MUZ12UN gt MUZ A12NA MUH15TN gt MUZ A15NA MUH17TN gt MUZ A17NA MUH24WN MUZ A24NA MU15TN gt MUY A15NA MU17TN gt MUY A17NA MU24WN gt MUY A24NA 1 Outdoor unit model has been changed 2 Control method between indoor and outdoor unit has been changed 3 Refrigerant has been changed R22 gt R410A 4 Fan motor has been changed AC gt DC 5 Compressor has been changed AC gt DC INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT This room air conditioner adopts HFC refrigerant R410A which never destroys the ozone layer attention to the following points though the basic installation procedure is same as that for R22 air conditioners DAs R410A has working pressure approximate 1 6 times as high as that of R22 some special tools and piping parts materials are required Refer to the table below Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and installation since it is more susceptible to contaminations than R22 For oo piping use clean pressure proof parts materials specifically designed for R410A Refer to 2 Refrigerant piping Composition change may occur R410A since it is a mixed refrigerant When charging charge liquid refrigerant to prevent composition change LLL Previous refrigerant HFC 32 HFC 125 50 50 R22 100 5 Saturated steam density 77 9 ops __________
50. AMBIENT TEMPERATURE THERMISTOR RT65 E12 A54 374 TERMINAL BLOCK TB1 2P E12 A55 374 TERMINAL BLOCK TB2 3P E12 A54 451 INVERTER P C BOARD E12 A55 451 INVERTER P C BOARD E12 A56 451 INVERTER P C BOARD E12 A57 451 INVERTER P C BOARD E12 B09 451 INVERTER P C BOARD E12 B10 451 INVERTER P C BOARD E12 B11 451 INVERTER P C BOARD 00000000000 000 E12 B12 451 INVERTER P C BOARD 75 Including heat sink and RT64 MUZ A24NA MUY A24NA 3 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS 30 29 28 3 N ZZ LES BAITS IES BB FS 7 BE FS J 2200 FS SIS ZEI 2222 5 BB Ju BA BB 75 22 A SAIS SLS SAIS KITS SS 7 5 717 SS 6 16 15 13 E Ss 7 8 9 10 11 12 76 MUY A24NA MUY A24NA 3 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration Part Part Symbol in Wiring Diagram Q ty unit MUZ A24NA U1 MUY A24NA Remarks E12 819 297 TOP PANEL 1 E12 A53 630 OUTDOOR HEAT EXC
51. ERGENCY OPERATION switch Reinstall either the unit or the light each other away Attach a filter on remote control receiving section of the indoor unit Is serial signal error indicated 6 minutes later Yes DK E Turn ON the power supply Does the LED on the inverter board or the outdoor electronic control P C board repeat 3 6 second OFF and 0 8 second ON quick blinking Yes Turn OFF the power supply Remove the short circuit between outdoor terminal block S2 and S3 Turn ON the power supply Is there amplitude of 10 to 20V DC 31 Mis wiring may damage indoor electronic control P C board during the operation Be sure to confirm the wiring is correct before the operation starts 3 Be sure to check this within 3 minutes after turning ON After 3 minutes LED blinks 6 times Even when the inverter P C 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 gt or the outdoor electronic control Lighted P C board 2 or not lighted 2 Be careful to the residual voltage of smoothing capacitor Is there any error of the indoor outdoor connecting wire such as the damage of the wire intermediate connection poor contact to the terminal block Yes Replace the indoor outdoor connecting wire
52. F 24 75 eral 5 22 DB end 8 8 2 5 ndoo 5 18 8 16 14 o E 15 25 35 45 55 This value of frequency is not the same as the actual frequency in operating Refer to 7 6 and 7 7 for the relationships Outdoor intake air WB temperature F between frequency and capacity MSZ A12NA SHF at rating condition 0 70 Airflow 318CFM 15 L 18 es lake air Wg ga 13 tempera 8 faa F sz 71 ex 67 9 63 5 1 4 oF zure C 71 5 13 Ne tempera 67 make 63 82 1 2 doof inta A 55614 8 10 8 09 o 5 65 75 85 95 105 115 Outdoor intake air DB temperature F MSZ A24NA MSY A24NA SHF at rating condition 0 63 Airflow 385CFM Total capacity X103 Btu h Total power consumption kW 65 75 85 95 105 115 Outdoor intake air DB temperature F MSZ A12NA Airflow 318CFM 22 20 18 awe ea 65 16 geen 13 am 14 cae 512 yo 5 12 10 8 5 S oF 75 13 t 70 12 os en 65 S 1 A E 1 2 14 y e os 5 1 0 5 09 8 08 5 15 25 35 45 55 Outdoor intake WB temperature F MSZ A2
53. HANGER E12 A58 630 OUTDOOR HEAT EXCHANGER E12 58 301 OUTDOOR FAN MOTOR RCO0J60 E12 851 501 PROPELLER E12 819 232 CABINET E12 819 521 FAN GUARD E12 819 009 HANDLE E12 851 290 BASE NOR N 12 065 506 COMPRESSOR RUBBER SET 3RUBBERS SET E12 56 900 55 SNB130FPDH E12 58 661 STOP VALVE GAS 65 8 12 821 662 STOP VALVE LIQUID 91 4 E12 A49 641 SERVICE PORT 1PC SET E12 851 493 EXPANSION VALVE COIL E12 851 640 EXPANSION VALVE N 5 Se es E12 58 490 R V COIL E12 56 961 4 WAY VALVE E12 819 650 VALVE COVER E12 819 245 SERVICE PANEL E12 935 374 TERMINAL BLOCK E12 A53 374 TERMINAL BLOCK E12 851 337 REACTOR E12 58 444 NOISE FILTER BOARD ke 03 E12 53 444 NOISE FILTER BOARD E12 935 309 AMBIENT TEMPERATURE THERMISTOR RT65 E12 851 308 THERMISTOR SET RT61 RT62 RT68 DEFROST DISCHARGE OUTDOOR HEAT EXCHANGER E12 A53 308 THERMISTOR SET RT62 RT68 DISCHARGI E OUTDOOR HEAT EXCHANGER E12 A58 440 POWER BOARD Including heat sink and RT64 E12 A58 450 OUTDOOR ELECTRONIC CONTROL P C BOARD E12 A53 450 OUTDOOR ELECTRONIC CONTROL P
54. LED1 T Lighting gt e 0 5 second ON Indication Symptom Abnormal point Condition Condition Correspondence SYMPIOM TED i Red LED2 Yellow Outdoor unit i i i 15A 20 operates Onie Lighting Primary current protection When the input current exceeds 15 Secondary current protection the current of the compressor exceeds 15 These symptoms do not mean any abnormality of the heck the following points High product but check uw When the indoor gas pipe temperature exceeds 113 F 45 during heating Check if indoor filters are clogged Check if refrigerant is short 21 Twice Lighting Check if indoor outdoor unit air circulation is short cycled Defrosting in cooling When the indoor gas pipe temperature falls 37 F 3 or below during MUZ cooling Discharge temperature Check refrigerant circuit and refrigerant amount 22 3 limes Lighting rol ein When the discharge temperature exceeds 212 F 100 during operation Refer to 10 5 Check of LEV Refer to 10 5 Check of outdoor thermistors When the frequency of the compressor is kept 80Hz or more and 23 4 limes Lighting on discharge tthe discharge temperature is kept under 102 F 39 C for more than 20 Refer to 10 5 0 Check of LEV temperature protection minutes Check refrigerant circuit and refrigerant amount This sympt
55. MITSUBISHI ELECTRIC SPLIT TYPE HEAT PUMP AIR CONDITIONERS OUTDOOR UNIT SERVICE MANUAL Wireless type Models MUZ A09NA MUZ AO9NA MUZ A12NA MUZ A12NA MUZ A15NA MUZ A15NA MUZ A17NA MUZ A17NA MUZ A24NA MUZ A24NA MUY A15NA MUY A17NA MUY A24NA Changes for the Better utilized R410A Indoor unit service manual MSZ A NA Series OB450 MUZ A09NA MUY A15NA MUZ A12NA MUY A17NA MUZ A15NA CONTENTS 1 TECHNICAL 2 2 PART NAMES AND FUNCTIONS 5 3 SPECIFICATION 2 ME 6 4 OUTLINES AND DIMENSIONS 10 5 WIRING gt 6 REFRIGERANT SYSTEM DIAGRAM 15 7 e 7 8 ACTUATOR CONTROL ennen 30 9 SERVICE FUNCTIONS nee eeen 31 10 TROUBLESHOOTING neen 31 11 DISASSEMBLY INSTRUCTIONS 59 66 12A PARTS 66 12 2 RoHS PARTS 72 13 OPTIONAL PARTS BACK PAGE NOTE This service manual describes technical data of the outdoor units RoHS compliant products have lt G gt mark on the spec name plate For servicing of ROHS compliant products refer to the PARTS LIST ROHS compliant Mir SUMI 1 TECHNICAL CHANGES MUZO9UN gt MUZ A0
56. MUZ A15NA MUZ A17NA MUY A15NA MUY A17NA 2 OUTDOOR UNIT ELECTRICAL PARTS 68 MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA MUY A15NA MUY A17NA 2 OUTDOOR UNIT ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration Part No Part Name Symbol in Wiring Diagram Q ty unit MUZ MUY 09 12 15 A17NA 15 17 Remarks E02 838 337 REACTOR L61 1 1 1 1 E02 A54 444 POWER P C BOARD 1 E02 A54 490 R V COIL 2184 E02 927 306 THERMISTOR SET RT61 RT62 DEFROST DISCHARGE E02 927 308 AMBIENT TEMPERATURE THERMISTOR RT65 E02 A54 374 TERMINAL BLOCK TB1 1 1 1 1 2P E02 A55 374 TERMINAL BLOCK TB2 3P E02 A54 451 INVERTER P C BOARD Including heat sink and RT64 E02 A55 451 INVERTER P C BOARD Including heat sink and RT64 E02 A56 451 INVERTER P C BOARD Including heat sink and RT64 INVERTER P C BOARD 69 Including heat sink and RT64 MUZ A24NA MUY A24NA 3 OUTDOOR UNIT STRUCTURAL PARTS ELECTRICAL PARTS AND FUNCTIONAL PARTS 30 29 28 3 N ZZ LES BAITS IES BB FS 7 BE FS J 2200 FS SIS ZEI
57. NA MSZ A15NA Mora MSZ A17NA Item Cooling Heating Cooling Heating Capacity 15 000 18 000 16 200 20 100 SHF 0 65 0 65 Input 1 69 1 79 2 07 2 15 Rated frequency 77 78 89 88 Electrical circuit Indoor unit MSZ A15NA MSY A15NA MSZ A17NA MSY A17NA Power supply V phase Hz 208 230 1 60 208 230 1 60 Input 0 030 0 030 Fan motor current 0 31 0 28 0 31 0 28 Aux heater current Outdoor unit MUT AIBNA MUZ A15NA MUT AIZNA MUZ A17NA Power supply V phase Hz 208 230 1 60 208 230 1 60 Input 1 660 1 760 2 040 2 120 Comp current 7 56 6 84 8 14 7 36 9 43 8 52 9 93 8 98 Fan motor current 0 42 0 38 0 42 0 38 Refrigerant circuit Condensing pressure Suction pressure Discharge temperature Condensing temperature Suction temperature Comp shell bottom temp Ref pipe length Refrigerant charge R410A 80 80 Intake air temperature 67 67 53 52 Discharge air temperature 52 51 Fan speed High 1 300 1 300 Airflow High 342 Wet 342 Wet 95 95 Intake air temperature Fan speed Airflow 25 Model MSZ A24NA MSY A24NA MSZ A24NA Item Cooling Heating Capacity 22 000 23 200
58. NOISE FILTER BOARD E02 935 309 AMBIENT TEMPERATURE THERMISTOR RT65 E02 851 308 THERMISTOR SET RT61 RT62 RT68 DEFROST DISCHARGE OUTDOOR HEAT EXCHANGER E02 53 308 THERMISTOR SET RT62 RT68 DISCHARGI E OUTDOOR HEAT EXCHANGER E02 A58 440 POWER BOARD Including heat sink and RT64 E02 A58 450 OUTDOOR ELECTRONIC CONTROL P C BOARD E02 A53 450 OUTDOOR ELECTRONIC CONTROL P C BOARD E02 A58 233 BACK PANEL OUT E02 817 009 HANDLE E02 851 515 MOTOR SUPPORT 83 E02 851 936 CAPILLARY TUBE TAPER PIPE 71 12 2 ROHS PARTS LIST RoHS compliant MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA MUY A15NA MUY A17NA 1 OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 15 72 MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA MUY A15NA MUY A17NA 1 OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration Q ty unit em MUZ A MUY A Part No Part Name in Wiring 3 Remarks Diagram 12NA 15NA 15NA17NA RoHS U1 U1 E12 927 232 CABINET E12 927 521 GRILLE E12 927 501 PROPELLER E12 927 290 E12 A54 900 COMPRESSOR 92 E12 A56 900 COMPRESSOR SNB130FPDH E12 065 506 COMPRESSOR RUBBER SET SRUBBERS SET E12 A54 661 STOP VALVE GAS 93 8
59. V coil MUZ A09 12 15 17 First of all measure the resistance of R V coil to check if the coil is defective Refer to 10 4 In case CN721 is not connected or R V coil is open voltage is generated between the terminal pins of the connector although any signal is not 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 CN61 between the compressor and intelligent power module Is there 208 230V AC between 7210 No Replace the Turn ON the power supply and press gt on the power P C board 3 minutes D 2 power P C board EMERGENCY OPERATION switch after the power supply is turned ON twice HEAT mode Yes Replace the 4 way valve CN721 Power P C board Soldered side Unit operates HEAT mode even if it is set to COOL mode Disconnect connector CN61 between a Is there 208 230V AC between 7210 ves TENETUR Turn ON the bower supply andress on the power P C board minutes power board EMERGENCY OPERATION switch once after the power supply is turned ON COOL mode Replace the 4 way valve 45 The cooling operation or heating operation does not operate LED display Both LED1 and LED2 lighting Check of R V coil MUZ A24 When heating operation does not work 1 Disconnect the lead wire l
60. ace or repair the coaxial cable d Is the indoor outdoor Yes Extend the distance between connecting wire of the air the indoor outdoor connecting conditioner and the wiring of wire of the air conditioner and the antennas close the wiring of the antennas Even if all of the above conditions is 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 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 5 Electric field intensity of the broadcast station affected by the electromagnetic noise 6 Presence or absence of amplifier such as booster 7 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
61. ailure occurs continuously three times within 30 seconds after the fan gets started Refer to 10 5 0 Check of outdoor fan motor 9 time flash Nonvolatile memory data Lighting 5 times When nonvolatile memory data cannot be read properly Replace the outdoor electronic control P C board 10 time flash Discharge temperature Lighting Lighting When the frequency of the compressor is kept 80Hz or more and the discharge temperature is kept under 102 F 39 C for more than 20 minutes Check refrigerant circuit and refrigerant amount e Refer 10 5 Check of LEV NOTE Blinking patterns of this mode differ from the ones of Troubleshooting check table 10 3 35 The left lamp of OPERATION INDICATOR lamp Indoor unit Abnormal point Failure mode protection LED indication Outdoor P C board Condition LED 1 LED2 Correspondence Indoor outdoor unit failure mode recall function 11 time flash Communication error between P C boards Lighting 6 times Communication error occurs between the electronic control P C board and power board for more than 10 seconds When the communication between boards protection stop is continuously performed twice Check the connecting wire between outdoor electronic control P C board and power board Current sensor Lighting 7 times When a short or open circuit is
62. al O dozens of Abnormal short O dozens of Q D Check of compressor MUZ A09 12 15 17 MUY A15 17 Refer to 10 5 Check of No compressor winding gt Replace the compressor Is the compressor normal Yes Refer to 10 5 Check of compressor operation time No operation time more than Replace the compressor Does the compressor 10 seconds operate continuously 3 Yes Yes Check the refrigerant circuit Check of compressor winding MUZ A09 12 15 17 MUY A15 17 Disconnect the connector CN61 between the compressor and intelligent power module and measure the resistance between the compressor terminals Measurement point gt gt at 3 points BLK WHT BLK RED Measure the resistance between the WHT RED lead wires at 3 points lt lt Judgement gt gt Refer to 10 4 Abnormal short Infinite O Abnormal open NOTE 1 Be sure to zero the ohmmeter before measurement 2 Winding resistance for each phase at 68 F 20 C Refer to 3 SPECIFICATION gt 43 F Check of compressor operation time MUZ A09 12 15 17 MUY A15 17 0 second Outdoor fan starts Connect the compressor and activate the inverter Then measure the Abnormal time until the inverter stops due to over current Compressor winding short or layer short lt lt Operation method gt gt Compres
63. ase current of compressor 12 time flash 2 5 seconds OFF When each phase current of compressor cannot be detected normally Refer to 10 5 How to check inverter compressor 13 time flash 2 5 seconds OFF DC voltage When DC voltage of inverter cannot be detected normally Refer to 10 5 How to check inverter compressor Frequency drop by current protection 1 time flash COGOR 2 5 seconds OFF operates When current from power outlet exceeds 9 2A A09 12 11 1A A15 17 compressor frequency lowers Frequency drop by high pressure protection 3 time flash 2 5 seconds OFF When temperature of indoor coil thermistor exceeds 131 F 55 C in HEAT mode MUZ compressor frequency lowers Frequency drop by defrosting in COOL mode When indoor coil thermistor reads 46 F 8 C or less in COOL mode compressor frequency lowers The unit is normal but check the following Check if indoor filters are clogged Check if refrigerant is short Check if indoor outdoor unit air circulation is short cycled 4 time flash 2 5 seconds OFF Frequency drop by discharge temperature protection When temperature of discharge temperature thermistor exceeds 232 F 111 C compressor frequency lowers Check refrigerant circuit and refrigerant amount Refer to 10 5 Check of LEV Refer to 10 5 Check of outdoor thermistors Outdoor unit operates Low d
64. ction 1 during compressor operating Replace the power board 1 Simes 109500 Bus bar voltage When the bus bar voltage exceeds 400V or falls to 50V or below P protection 2 during compressor operating hres ti thi 16 13 times Goes ou Outdoor fan motor pete tyes ies within st seconds aller Refer to 10 5 0 Check of outdoor fan motor Current sensor When a short or open circuit is detected in the current sensor durin 17 Lighting 8 times protection compressor 0 Replace the power board 1 Lighti 11 Communication between P C Communication error occurs between the outdoor electronic control P C Check the connecting wire between outdoor electronic control 8 ignung mes boards protection board and power board for more than 10 seconds P C board and power board Light T Zero cross detecting circuit When zero cross signal cannot be detected while the compressor is Check the connecting wire among outdoor electronic control 19 ighting 12 times protection operating board noise filter board and power board NOTE 1 The location of LED is illustrated at the right figure 2 LED is lighted during normal operation 2 5 second OFF OFF Refer to 10 6 3 0 5 second ON 2 5 second OFF The flashing frequency shows the number of times the LED blinks after every 2 5 second OFF Example When the flashing frequency is 2 38 Outdoor electronic control P C board Parts side LED2
65. d input correction by inverter output frequency MUZ A09NA Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 1 5 1 5 2 0 2 0 9 5 2 2 S 8 815 815 1 0 1 0 5 0 2 9 E 8 910 51 0 5 205 805 gt 8 8 805 205 6 S T 0 0 0 0 0 0 0 0 0 50 100 150 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 operational frequency of compressor MUZ A12NA T Correction of Cooling capacity T Correction of Cooling total input Correction of Heating capacity 4 correction of Heating total input 5 5 5 5 8 81 5 815 519 210 5 9 6 o E 21 0 5 1 0 8 9 9 3 8 205 80 5 gt 8 S 8 80 5 805 0 0 0 0 0 0 0 0 0 50 100 150 2 0 50 100 150 2 0 50 100 150 Hz 0 50 100 150 2 The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor operational frequency of compressor MUZ A15NA MUY A15NA MUZ A15NA Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 15 15 1 5 1 5 o 8 p 5 p 810 S 10 510 510 9 5 5 5 5 5 5 5 205 8 05 05 4 805 ANE o
66. detected after 30 minutes of compressor start up Refer to 10 5 How to check inverter compressor 10 Wh tis detected within 30 minutes of ected within 30 minutes of compressor s repeated Lock protection p Check the power module PAM module G Discharge temperature When temperature of discharge temperature thermistor exceeds 241 F Check the amount of gas and refrigerant circuit 11 imes protection 116 C compressor stops Compressor can restart if discharge temperature Refer to 10 5 0 Check of LEV thermistor reads 212 F 100 C or less 3 minutes later oe When the fin temperature exceeds 189 F 87 C during operation Check refrigerant circuit and refrigerant amount 12 4times Goesout B Refer to 10 5 0 Check of LEV When the board temperat ds 158 F 70 C ti protection en the P C board temperature exceeds 70 C during operation High pressure When the outdoor heat exchanger temperature exceeds 158 F 70 C Check around of gas and the refrigerant circuit 13 5 times Goes ou protection during cooling or when indoor gas pipe temperature exceeds 158 F 70 C Check of stop valve during heating MUZ i ilure i in th ion of th i 14 8 times Goes ou Converter protection pear ida is detected in the operation of the converter during Replace the power board Bus bar voltage When the bus bar voltage exceeds 400V or falls to 200V or below prote
67. door unit Other abnormality When the inverter P C board is defective Replace the inverter P C board NOTE Blinking patterns of this mode differ from the ones of Troubleshooting check table 10 3 34 MUZ A24NA MUY A24NA The left lamp of OPERATION INDICATOR lamp Indoor unit Abnormal point Failure mode protection LED indication Outdoor P C board LED 1 LED 2 Condition Correspondence Indoor outdoor unit failure mode recall function OFF Non Normal 2 time flash Outdoor power system Lighting Lighting When IPM protection stop or lock protection stop is continuously performed three times within 1 minute after the compressor gets started or when converter protection stop or bus bar voltage protection stop is continuously performed three times within 3 minutes after start up Check the connection of the compressor connecting wire Refer to 10 5 How to check inverter compressor Check the stop valve 3 time flash Discharge temperature thermistor Lighting Once Defrost thermistor MUZ Lighting Once Ambient temperature thermistor Lighting Twice Fin temperature thermistor Lighting 3 times P C board temperature thermistor Lighting 4 times Outdoor heat exchanger temperature thermistor Lighting 9 times When thermistor shorts or opens during compresso
68. e the noise filter P C board from the inverter assembly 4 5 6 7 02012 3 Removing R V coil MUZ 1 Remove the top panel cabinet and service panel 2 Remove the back panel Refer to 1 3 Remove the inverter assembly Refer to 2 4 Remove the R V coil Photo 8 Photo 4 Screws of the power board assembly Screws of the relay panel 63 OPERATING PROCEDURE PHOTOS 4 Removing the defrost thermistor MUZ discharge temperature thermistor outdoor heat exchanger temperature thermistor and ambient temperature thermistor 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 Pull out the defrost thermistor from its holder Photo 6 MUZ 5 Pull out the discharge temperature thermistor from its holder Photo 5 6 Pull out the outdoor heat exchanger temperature thermistor from its holder Photo 6 7 Pull out the ambient temperature thermistor from its holder Photo 6 Photo 5 Discharge temperature thermistor Photo 6 Outdoor heat exchanger temperature thermistor Ambient temperature thermistor thermistor for MUZ 5 8 T 28 tes 1 5 Removing outdoor fan motor 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Rem
69. eading to the compressor 2 3 minutes after turning on the power supply start EMERGENCY OPERATION in HEAT mode Is there voltage of 208 230V AC between 1 and pin 2 at connector CN912 1 Turn off power supply of indoor and outdoor unit and disconnect the connector 781 in the outdoor electronic control P C board 2 3 minutes after turning on the power supply start EMERGENCY OPERATION in HEAT mode Is there voltage 12V DC between the connector CN781 pin 5 and pin 3 Turn off power supply of indoor and outdoor unit Disconnect the connector CN912 in noise filter P C No board Is there normal resistance to R V coil No Replace the electronic control P C board Replace the R V coil Replace the noise filter P C board Replace the 4 way valve When cooling operation does not work 1 Disconnect the lead wire leading to the compressor 2 3 minutes after turning on the power supply start EMERGENCY OPERATION in COOL mode x If the connector CN912 is not connected or R V coil is open voltage occurs li between terminals even when the control is OFF Is there voltage of 208 230V AC between pin1 Replace the 4 way valve and pin 2 at connector CN912 Yes 1 Turn off power supply of indoor and outdoor unit and disconnect the connector CN781 in the outdoor electro
70. ed Initial setting 50 F 10 C 41 F 5 C none aa 55 F 13 C 46 F 8 C 10 TROUBLESHOOTING MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA MUZ A24NA MUY A15NA MUY A17NA MUY A24NA 10 1 Cautions on troubleshooting 1 Before troubleshooting check the following 1 Check the power supply voltage 2 Check the indoor outdoor connecting wire for mis wiring 2 Take care the following during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with the remote controller and then after confirming the horizontal vane is closed turn off the breaker and or disconnect the power plug 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the top panel and the electronic control P C board 3 When removing the electrical parts be careful to 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 X O v Lead wiring Housing point 3 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 w
71. erter P C board from the inverter assembly 9 Remove the screw fixing the power P C board See Photo 4 10 Disconnect all connectors and lead wires on the power P C board 11 Remove the power P C board from the inverter assembly 4 5 6 7 gt gt a 3 Removing R V coil MUZ 1 Remove the top panel cabinet and service panel Refer to 1 2 Disconnect the power supply and indoor outdoor connecting wire and remove the back panel Refer to 1 3 Remove the inverter assembly Refer to 2 4 Remove the R V coil See Photo 6 4 Removing the discharge temperature thermistor and defrost thermistor 1 Remove the top panel cabinet and service panel Refer to 1 2 Disconnect the power supply and indoor outdoor connecting wire and remove the back panel Refer to 1 3 Remove the inverter assembly Refer to 2 4 Pull out the discharge temperature thermistor from its holder See Photo 5 5 Pull out the defrost thermistor from its holder See Photo 5 PHOTOS Photo 3 Screws of the relay panel Screws of the ground wires Photo 4 Inverter Power Heat sink board P C board Screw of the power P C board R V coil Photo 5 for MUZ Discharge temperature thermistor 60 OPERATING PROCEDURE PHOTOS 5 Removing outdoor fan motor Photo 6 1 Remove the top panel cabinet and service panel Refer to 1 2 Discon
72. is Drainage hole 1 5 8 and on both sides of the unit e 5 Air in aya Air in c 4 in 14 LA 4 Mors 7 8 29 32 11 1 4 17 32 3 Open two sides of left handle 7 right or rear side 2 kd N Liquid pipe 1 4 flared 3 8 flared MUZ A09 12NA 1 i 1 2 flared MUZ A15 17NA MUY A15 17NA p Xa 8 11 29 32 6 23 32 2 19 11 16 be 31 1 2 2 23 32 Open as a rule MUZ A24NA MUY A24NA REQUIRED SPACE 20 9 32 ye hole 1 5 8 the front and both sides are open 4inch or more 8inch or more if there are obstacles to both sides 19 11 16 33 1 16 3 3 16 Open as rule 4 25742 gt 20inch or more if the back both sides and top are open 4 3 8 13 16 Oval hole Service panel A e X 23 S NS Liquid refrigerant pipe joint Refrigerant pipe flared 61 4 ZA M INNS C 7 16 15 16 6 1 28 Gas refrigerant pipe joint Refrigerant pipe flared 25 8 7 25 32 10 WIRING DIAGRAM 5 MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA BUTDTAJAS 10 207291009 12019 12411181 1120 5 09 01 18 104 ALUO 51032npuo3 184001 88 91219919 JIUN 200419 01 1819 BULIIA 211128 9
73. is abnormal T Blinking at 0 5 Blinking at 0 5 i second interval 25 3 second second interval gt 2 5 OFF a 3 second ON gt ON Wag LI LIT IPSI lt gt 47 4 4 47 4 ie No beep Beeps gt lt No beep Beeps pia Repeated cycle Repeated cycle Repeated cycle 32 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 Confirm that the remote controller is in the failure mode recall function Y 31 Regardless of normal or abnormal 2 short With the remote controller headed towards the indoor unit press TOO COOL or TOO beeps are emitted as the signal is received WARM button to adjust the set temperature to 77 F 1 Does left lamp of OPERATION INDICATOR lamp N on the indoor unit blink at the interval of 0 5 seconds OFF Blinks The outdoor unit is abnormal Beep are emitted at the same timing as the blinking of the left lamp of OPERATION INDICATOR lamp 2 Yes Blinks The outdoor unit is abnormal Check the blinking pattern and confirm the abnormal point with the Th td iti outdoor unit failure mode table Refer to 10 2 3 G oulcoor unit is normal Make sure to check at least two consecutive blinking cycles 2 Releasing
74. ischarge temperature protection 7 time flash 2 5 seconds OFF When 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 refrigerant amount 8 time flash 2 5 seconds OFF PAM protection PAM Pulse Amplitude Modulation When the overcurrent flows into IGBT Insulated Gate Bipolar transistor TR821 or when the bus bar voltage reaches 320V or more PAM stops and restarts This is not malfunction PAM protection will be activated in the following cases Instantaneous power voltage drop Short time power failure Oher the power supply voltage is igh Inverter check mode 9 time flash 2 5 seconds OFF NOTE 1 The location of LED is illustrated at the right figure 2 LED is lighted during normal operation When the connector of compressor is disconnected inverter check mode starts Refer to 10 6 1 The flashing frequency shows the number of times the LED blinks after every 2 5 second OFF Example When the flashing frequency is 2 0 5 second ON 2 5 second OFF 37 0 5 second ON Check if the connector of the compressor is correctly connected Refer to 10 5 How to check inverter compressor Inverter P C board Parts side LED Flashing 8 MUZ A24NA MUY A24NA
75. ith strainer with heat Refrigerant flow in cooling gt Refrigerant flow in heating MUZ MUZ A24NA Muffler Refrigerant pipe 65 8 with heat insulator Stop valve MY with service ms Outdoor Flared connection Discharge heat Ambient temperature gt port exchanger temperature thermistor Defrost thermistor thermistor RT65 Service q RT61 port Compressor Outdoor heat exchanger temperature ermistor Le RT68 Flared connection _ Strainer LEV strainer Receiver 100 100 R V gt heating 27 Capillary tube cooling BED pipa gin oF X 1 0 0 094 __ Refrigerant flow in cooling with heat insulator Refrigerant flow in heatin 03 6 x 2 4 50 3 15 MUY A24NA Unit inch Refrigerant pipe 5 8 Muffler with heat insulator 4 way valve 100 A1 Stop valve with service port Flared connection Discharge Ambient temperature temperature thermistor i thermistor Outdoor heat exchanger temperature thermistor RT68 Flared connection Refrigerant pipe 41 4 with heat insulator Strainer Receiver 100 Capillary tube 0 142 x 0 094 gt Refrigerant flow in cooling X 1 31 32 63 6 x 2 4 x 50 MAX REFRIGERANT PIPING LENGTH and MAX HEIGHT DIFFERENCE Refrigerant piping ft Model Max length Max Height difference A B Gas Liquid Piping
76. n cycle decreases or normal operation can be impossible However charging the liquid refrigerant all at once may cause the compressor to be locked Thus charge the refrigerant slowly Indoor unit Refrigerant gas cylinder operating valve Union Stop valve Liquid pipe Outdoor unit Gas pipe Service port Gauge manifold valve for R410A Refrigerant gas cylinder for R410A with siphon Refrigerant liquid Electronic scale for refrigerant charging 2 PART NAMES AND FUNCTIONS MUZ A09NA MUZ A15NA MUY A15NA MUZ A24NA MUZ A12NA MUZ A17NA MUY A17NA MUY A24NA Y Air inlet Air inlet back and side back and side Drain hose gonn Drain hose iii TT Drain outlet 3 SPECIFICATION 57 09 57 12 Item Capacity Cooling 9 000 5 500 9 000 12 000 5 700 12 000 Rated Minimum Maximum Heating 47 10 900 5 200 12 600 13 600 5 200 13 600 Capacity Rated Heating 17 7 700 8 300 Power consumption Cooling 690 390 690 1 170 395 1 170 Rated Minimum Maximum Heating 47 860 350 1 100 1 160 350 1 160 Power consumption Rated Heating 17 880 930 EER 1 SEER Cooling 13 0 17 0 10 3 17 0 HSPF IV V 4 Heating 8 2 6 7 8 2 6 7 COP Heating 3 71 3 44
77. n of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 31 l 3X1 Regardless of normal or abnormal a short beep is emitted once as the signal is received Does the left lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0 5 No Indoor unit is normal seconds OFF But the outdoor unit might be abnormal because there are some Blinks Either indoor or outdoor unit is abnormal abnormalities that can t be recalled with this way Beep are emitted at the same timing Contirm if outdoor unit is abnormal according to the detailed outdoor as the blinking of the left lamp of unit failure mode recall function Refer to 10 2 2 OPERATION INDICATOR lamp 2 Yes Judgment of indoor outdoor abnormality Blinks Before blinking does the left lamp of OPERATION INDICATOR lamp stay ON for 3 Yes seconds Stays ON for 3 seconds without beep The outdoor unit is abnormal The indoor unit is abnormal The outdoor unit is abnormal Check the blinking pattern and confirm the abnormal point with the indoor unit Check the blinking pattern and confirm the abnormal point with the failure mode table Refer to indoor unit service manual outdoor unit failure mode table Refer to 10 2 3 Make sure to check at least two consecutive blinking cycles 2 Make sure to check at least two consecutive blinking cycles
78. nect the power supply and indoor outdoor connecting wire and remove the back panel Refer to 1 3 Disconnect the connectors for outdoor fan motor 4 Remove the propeller nut 5 Remove the propeller 6 Remove the screws fixing the fan motor See Photo 7 7 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 Disconnect the power supply and indoor outdoor connecting wire and remove the back panel Refer to 1 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 Photo 7 shows 0 PSIG Defrost thermistor Screws of the outdoor fan motor 5 Detach the welded part of the suction and the discharge pipe connected with compressor 6 Remove the nuts of compressor legs 7 Remove the compressor 8 Detach the welded part of pipes connected with 4 way valve See Photo 8 Propeller Photo 8 Welded parts of 4 way valve 61 11 2 MUZ A24NA MUY A24NA OPERATING PROCEDURE 1 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 top panel 6 Remove the valve cover 7 Remove the screws of the cabinet 8 Remove the cabinet 9 Remove the screws of
79. nic control P C board 2 3 minutes after turning on the power supply start EMERGENCY OPERATION in COOL mode Is there voltage 12V DC between the connector CN781 pin 5 and pin 3 Replace the noise filter P C board Replace the outdoor electronic control P C board 46 Outdoor fan motor does not operate D Check of outdoor fan motor MUZ A09 12 15 17 MUY A15 17 Is the resistance between each terminal of outdoor fan motor normal Refer to 10 4 No Yes Disconnect CN932 gt from the inverter urn ON the Rotate the outdoor fan slowly by hand and measure the voltage of CN931 Measurement of feedback output Between and Between and 6 Between 6 Does the voltage between M Fixed to either 5V or OV DC gt gt P C board power supply Inverter P C board Solder side CN931 CN932 No each terminal repeat 5V and OV DC by turns Yes Does the outdoor fan ui motor Replace the outdoor fan Fan motor does not operate or stops operating shortly after starting the operation D Check of outdoor fan motor MUZ A24 MUY A24 Check the connection between the connector CN931 and CN932 Is the resistance between each terminal of outdoor fan motor normal No rotate smoothly Yes
80. nt the back flow of oil This adapter enables you to use It is difficult to measure R410A with a charging cylinder because the No Not Substitutable for R410A Yes Substitutable for R410A 2 Refrigerant piping Specifications Use the copper or copper alloy seamless pipes for refrigerant that meet the following specifications Outside diameter in Wall thickness in Insulation material 0 0315 Heat resisting foam plastic 0 0315 Specific gravity 0 045 Thickness 0 315 0394 Flaring work and flare nut Flaring work for R410A pipe differs from that for R22 pipe For details of flaring work refer to Installation manual FLARING WORK Pipe diameter Dimension of flare nut mm in 11 16 17 11 16 17 Apply the special refrigeration oil accessories packed with indoor unit to the flare and the union seat surfaces 3 Refrigerant oil 4 Air purge Do not discharge the refrigerant into the atmosphere Take care not to discharge refrigerant into the atmosphere during installation reinstallation or repairs to the refrigerant circuit Use the vacuum pump for air purging for the purpose of environmental protection 5 Additional charge For additional charging charge the refrigerant from liquid phase of the gas cylinder If the refrigerant is charged from the gas phase composition change may occur in the refrigerant inside the cylinder and the outdoor unit In this case ability of the refrigeratio
81. om does not mean any abnormality of the ing hi 7 duct but check the following points 1 2 Cooling high pressure When the outdoor heat exchanger temperature exceeds 136 F 58 C gp 24 5 times Lighting protection duii ti Check if indoor filters are clogged unng operation Check if refrigerant is short Check if indoor outdoor unit air circulation is short cycled Outdoor unit 25 operates 9 times Lighting Inverter check mode When the unit is operated with emergency operation switch 26 Lighting Lighting Normal ES 39 10 4 Trouble criterion of main parts MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA MUY A15NA MUY A17NA Part name Check method and criterion Figure Defrost thermistor RT61 MUZ Ambient temperature thermistor RT65 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 temperature thermistor RT62 Fin temperature 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 U V U W 0 43 Q 0 53 Q V W 0 39 Q 0 49 Q thermistor RT64 the chart of thermistor Measure the resistance between the terminals with a tester Part temperature 14 F 104 F WHT RED BLK Normal MUZ A15 17 Compressor
82. ompressor stops for overcurrent protection within 1minute after start up Check stop valve Reconnect connector of compressor Refer to 10 5 09 How to check inverter compressor Outdoor thermistors When discharge temperature thermistor fin temperature thermistor defrost thermistor MUZ P C board temperature thermistor or ambient temperature thermistor shorts or opens during compressor running Refer to 10 5 Check of outdoor thermistors Outdoor control System When nonvolatile memory data cannot be read properly Replace inverter P C board 6 time flash 2 5 seconds OFF serial signal When the communication fails between the indoor and outdoor unit for 3 minutes Refer to 10 5 How to check mis wiring and serial signal error Outdoor unit 14 time flash Other abnormality 2 5 seconds OFF When outdoor unit is defective Refer to 10 2 2 Flow chart of the detailed outdoor unit failure mode recall function Overcurrent protection 2 time flash 2 5 seconds OFF stops and restarts 3 minutes later is repeated When 24A A09 1 2 26 5A A15 17 current flows into intelligent power module Check stop valve Reconnect connector of compressor Refer to 10 5 How to check inverter compressor 3 time flash 2 5 seconds OFF Discharge temperature overheat protection When temperature of discharge temperature thermist
83. or exceeds 241 F 116 C compressor stops Compressor n restart if discharge temperature thermistor reads 2129 100 or less 3 minutes later Check refrigerant circuit and refrigerant amount Refer to 10 5 Check of LEV 4 time flash 2 5 seconds OFF Fin temperature P C board temperature thermistor overheat protection When temperature of fin temperature thermistor on the heat sink exceeds 180 F 82 C A09 12 188 F 86 5 C 415 17 or temperature of P C board temperature thermistor on the inverter P C board exceeds 176 F 80 C Check around outdoor unit Check outdoor unit air passage Refer to 10 5 0 Check of outdoor fan motor 5 time flash High pressure 2 5 seconds OFF oe protection When indoor coil thermistor exceeds 158 F 70 C in HEAT mode MUZ When the defrost thermistor exceeds 158 F 70 C in COOL mode Check refrigerant circuit and refrigerant amount Check stop valve 8 time flash Compressor 2 5 seconds OFF synchronous abnormality When 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 When 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 Each ph
84. or HEAT mode COOL Press once HEAT Press twice Test run operation starts and continues to operate for 30 minutes Compressor operates at rated frequency in COOL mode or 58Hz in HEAT mode Indoor fan operates at High speed After 30 minutes test run operation finishes and EMERGENCY OPERATION starts Operation frequency of compressor varies To cancel test run operation EMERGENCY OPERATION press EMERGENCY OPERATION switch or any button on remote controller 29 8 ACTUATOR CONTROL MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA MUZ A24NA MUY A15NA MUY A17NA MUY A24NA 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 Compressor Outdoor fan motor OFF 8 2 R V coil control lt MUZ A09 12 15 17 24 gt Heating dee n bus N Cooling And A mus vom Nad erik OFF Dj EEN ENE OFF NOTE The 4 way valve reverses for 5 seconds right before start up of the compressor lt COOL gt lt HEAT gt 5 seconds 5 seconds 2 ON ompressor OFF lt MUZ A09 12 15 17 gt i R V coil ON ON or OFF ON or OFF OFF Eo lt MUZ A24 gt R V coil ON ON or or
85. ork 2 Before servicing check that the connector and terminal are connected properly 3 If the electronic control P C board is supposed to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 4 When troubleshooting refer to 10 2 and 10 3 31 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 This mode is very useful when the unit needs to be repaired for the abnormality which doesn t recur 1 Flow chart of failure mode recall function for the indoor outdoor unit This figures show about MSZ A09 12 15 17 Operational procedure The cause of abnormality cannot be found because the abnormality doesn t recur Setting up the failure mode recall function Turn ON the power supply lt Preparation of the remote controller gt 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 ELECTRIC Press OPERATE STOP ON OFF butto
86. ove the inverter assembly Refer to 2 4 Remove the propeller 5 Remove the screws fixing the fan motor 6 Remove the fan motor Photo 7 Propeller Screws of the outdoor fan motor 64 OPERATING PROCEDURE 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 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG 5 Detach the welded part of the suction and the discharge pipe connected with compressor Photo 9 6 Remove the compressor nuts 7 Remove the compressor 8 Detach the welded part of 4 way valve and pipe Photo 8 PHOTOS Photo 8 A R V coil for MUZ Welded parts of 4 way valve Photo 9 Welded part of the discharge pipe Welded part of the suction pipe 7 Removing the reactor 1 Remove the top panel Refer to 1 2 Disconnect the reactor lead wire 3 Remove the screws of the reactor and remove the reactor Photo 10 Screws of the reactor 65 PARTS LIST 12 12 1 PARTS LIST non RoHS compliant MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA MUY A15NA MUY A17NA 1 OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS 15 66 MUZ A09NA MUZ A12NA MUZ A
87. r 5 minutes in 4 Lightning 5 times emperalure whenmistor cooling and 10 minutes in heating MUZ of compressor start up Refer to 10 5 Check of outdoor thermistor Defrost thermistor When a short circuit is detected the thermistor during operation or MUZ when an open circuit is detected in the thermistor after 5 minutes of compressor start up i When the communication fails between the indoor and outdoor Refer to 10 5 How to check mis wiring and serial signal 5 Lightning 6 times Serial signal unit for 3 minutes error 6 Lightning 7 times Nonvolatile memory data When the nonvolatile memory data cannot be read properly Replace the outdoor electronic control P C board 7 Lightning 8 times Current sensor Current sensor protection stop is continuously performed twice Replace the power board Communication error When the communication protection stop between boards is Check the connecting wire between outdoor electronic control signing _ between P C boards continuously performed twice P C board and power board 9 idhini 21 Zero cross detecting The protection stop of the zero cross detecting circuit is continuously Check the connecting wire among outdoor electronic control Lightning 12 circuit performed 10 times P C board noise filter P C board and power board Outdoor unit i stops and Reconnect compressor connector restarts 3 PM protection When over current is
88. r running Refer to 10 5 Check of outdoor thermistors Replace the outdoor electronic control P C board Refer to 10 5 Check of outdoor thermistors 4 time flash Over current When 28 current flow into intelligent power module Reconnect compressor connector e Refer to 10 5 How to check inverter compressor Check the stop valve 5 time flash Discharge temperature Lighting Lighting When 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 refrigerant amount Refer to 10 5 0 Check of LEV 6 time flash High pressure Lighting Lighting When the outdoor heat exchanger temperature exceeds 158 F 70 C during cooling or the indoor gas pipe temperature exceeds 158 F 70 C during heating MUZ Check refrigerant circuit and refrigerant amount Check the stop valve 7 time flash Fin temperature 3 times When the fin temperature exceeds 189 F 87 C during operation P C board temperature When the P C board temperature exceeds 158 F 70 C during operation Check around outdoor unit Check outdoor unit air passage Refer to 10 5 0 Check of outdoor fan motor 8 time flash Outdoor fan motor Lighting Lighting When f
89. rv9X HOISIWH3Hl dW3l 398VHOSIQ 2918 JINGOW d3MOd IN3OITI3INI IMS 1081 15 1504430 1914 311004 43404 IN39I 1131NI j 69H EEN 481 401515341 158 A0Sc IVIL 353 1163 EEEN 4911031409 8012 4 H3MOd 244 61 3503 1084 105119455 0151 A052 Wel 3503 794 8015153818 31114 3SION u3N8035NVHI IN3HHfO 1919 80151534 8 733 44 HAWYOSSNVUL 1 3 8910 119 301618 431 839 1V3H 8000110 8918 8055384402 IW 401129492 1005 6 189 10845 10855 108455 191230 8819 4914 19144913 100011 2 0014 6 0130 21113380 LINN 00011 1011 65 Q 110 aseyd AEC 802 SAYIN ONTLOINNOD LINA 800081 OL 894 Vat zalk 1109 88814 T 1085 8906 14415 4309 13 MUY A24NA 10138U00 TT 2019 1801291 91021pUT 51041400 BULJIM Plats 58101210102 180002 9972 11215188 10 WEIGEIP 21242918 JIUN JOOPUT 8 0 1819 BUTJIM 21112818 8 15 1001 ayy nOqV SILON 80181838 8919 5 2 1018 UIONVHOKA 1433 9000110 8914 NOISNVdX3 31 8016 1 dW3l INJIGAV 9918 u0lov3u 1 UOISINH3HI dW3l NIJ 7918 310008 H3MOd IN3OITI3INI UOISINH3HI 4431 JOUVHOSTO 2514 31000
90. se this operation press the EMERGENCY OPERATION switch twice or once or press any button on the remote controller 18 7 2 PERFORMANCE CURVE Cooling MSZ A09NA SHF at rating condition 0 71 Airflow 275CFM Total capacity X109 Btu h Total power consumption 4 75 85 95 105 Outdoor intake air DB temperature F MSZ A17NA MSY A17NA SHF at rating condition 0 65 Airflow 342CFM 24 Oor 22 in Be P take air Wg 1 Mperat 5 8 ure 2 16 ox r 71 E 14 67 12 63 8 25 CO 74 23 tem 67 2 63 maks 82 10007 5 19 5 17 8 15 65 75 85 95 105 115 Outdoor intake air DB temperature F Heating MSZ A09NA Airflow 307CFM 15 14 70 75 13 2212 LM Ox 581 09 580 55 Ri SX 8 i 2 5 oF 8 10 intake air DB temperatur 2 8209 indoor intal 65 5 0 8 8 07 w 0 6 5 15 25 35 45 55 Outdoor intake air WB temperature F Airflow 381CFM 65 70 24 Son 75 ae gt 20 99 ax ot e oS EO CN 16 89 5 77 12 5 e
91. size O D in MUZ AO9NA MUZ A12NA 3 8 1 4 MUZ A15NA MUY A15NA MUZ A17NA 1 2 1 4 MUY A17NA MUZ A24NA MUY A24NA Indoor unit Max Height difference B Max length A Outdoor unit ADDITIONAL REFRIGERANT CHARGE R410A oz Refrigerant piping exceeding 25ft requires additional refrigterant charge according to the calculation Outdoor unit Refrigerant piping length one way ft Model precharged 30 40 50 60 MUZ AO9NA MUZ A12NA 20985 MUZ A15NA MUY A15NA MUZ A17NA MUY A17NA 21 702 Calculation Xoz 1 62 50z ft x Refrigerant piping length ft 25 16 Outdoor unit Refrigerant piping length one way ft Model precharged 40 50 60 70 80 MUZ A24NA MUY A24NA Alb 3 24 5 40 7 56 9 72 11 88 Calculation Xoz 1 08 502 ft x Refrigerant piping length ft 25 NOTE Refrigerant piping exceeding 25ft requies additional refrigerant charge according to the calculation 7 DATA MUZ A09NA MUZ A12NA MUZ A15NA MUZ A17NA MUZ A24NA MUY A15NA MUY A17NA MUY A24NA 7 1 PERFORMANCE DATA 1 COOLING CAPACITY Indoor air Outdoor intake air DB 95 IWB CF 71 MSZ A09NA 67 63 71 MSZ A12NA 67 63 71 MSZ A15NA 67 MSY A15NA 63 71 MSZ A17NA
92. sor connector poor contact Start heating or cooling operation by pressing EMERGENCY Compressor lock out OPERATION switch on the indoor unit TEST RUN OPERATION Refer to 7 7 lt lt Measurement gt gt Measure the time from the start of outdoor fan running to the stop of 10 seconds compressor due to over current lt lt Judgement gt gt For reference Abnormal 0 10 Seconds Abnormal compressor short or poor contact Refrigerant circuit defect etc compressor lock out 10 seconds 5 minutes Abnormal refrigerant circuit defect 5 minutes Normal more than 5 minutes Normal When OPERATION INDICATOR lamp flashes 6 time The thermistors in the outdoor unit are abnormal Check of outdoor thermistors MUZ A09 12 15 17 MUY A15 17 Disconnect connectors CN641 CN642 and CN643 from the inverter board Defrost thermistor RT61 Check the characteristics of each thermistor Measure the resistance between 641 Q Discharge temperature thermistor RT62 Measure the resistance Replace the inverter between 641 Reconnect the P C board connectors CN641 CN642 No Is the resistance of 1 Fin temperature thermistor normal 1 65 Tum d gt Does the unit operate thermistor RT64 Refer to 10 6 1 A supply an 10 minutes or more Measure the No EMERGENCY Yes resistance OPERATION between CN642 Replace the switch OK
93. the back panel 10 Remove the back panel Photo 3 Screw of the motor support Conduit plate Screws of the back panel Set screws of the back panel PHOTOS Photo 1 Screw of the top panel Screws of the cabinet Screws of the cabinet Photo 2 Screw of the service panel Screws of the top panel Screws of the cabinet Screw of the valve cover 62 OPERATING PROCEDURE PHOTOS 2 Removing the inverter assembly inverter P C board and power board 1 Remove the top panel cabinet and service panel Refer to 1 2 Remove the back panel Refer to 1 3 Disconnect the following connectors lt Electronic control P C board gt CN931 and CN932 Fan motor CN795 LEV CN661 Discharge temperature thermistor defrost thermistor MUZ and outdoor heat exchanger temperature thermistor lt Noise filter board gt CN912 4 way valve MUZ Remove the compressor connector Remove the screws fixing the relay panel Remove the inverter assembly Disconnect all connectors and lead wires on the electronic control P C board 8 Remove the electronic control P C board from the inverter assembly 9 Remove the screws fixing the power board assembly 10 Disconnect all connectors and lead wires on the power board 11 Remove the power board from the inverter assembly 12 Disconnect all connectors and lead wires on the noise filter P C board 13 Remov
94. unit frosts When heating non operating indoor unit get warm D Check of LEV LED display LED1 LED2 Lighting Lighting MUZ A24 MUY A24 6 time Goes out Turn on power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely Is click click sound heard Yes Or do you feel vibration of the LEV coil with a hand No Disconnect the connector CN795 Yes Replace the outdoor electronic Is there normal resistance to LEV coil control P C board No Replace the LEV coil Outdoor fan motor does not operate or stops immediately after starting up Check of inverter board MUZ A09 12 15 17 MUY A15 17 the outdoor fan motor D Refer 010 5 0 Is the fuse F901 blown on Yes the inverter P C board Check the connection of the connectors 931 CN932 of outdoor fan motor If the connection is poor make it correct CN931 CN932 Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on No Check the corresponding parts the inverter P C board gt following LED indication Does the LED flash 10 times Refer to 10 3 Yes 10 times flash Replace the inverter P C board 51 When unit cannot operate neither by the remote controller nor by EMERGENCY OPERATION s
95. veral Replace the inverter P C board and compressor How to check inverter compressor ebay LEED E Lighting Lighting MUZ A24 MUY A24 Lighting Twice Twice Goes out Disconnect the terminal of the compressor 3 minutes after turning on the power supply start EMERGENCY OPERATION e After the outdoor fan starts running wait for 1 minute or more before measuring the voltage The output voltage values have the tolerance of 20 COOL HEAT Measure the voltage between each lead wire leading to the compressor U BLK V WHT V WHT W RED W RED U BLK Is voltage output on right table No 122V 187V 74V 126V 56 2 87 2 2 58 2 lt Is output balanced gt the input voltage to the outdoor electronic Replace the power board control P C board 370V or more lves Turn off power supply of indoor and outdoor unit and measure the compressor winding resistance between the compressor terminals Is the resistance between each terminal normal yes Reconnect the lead wire of compressor and turn on power supply to indoor and outdoor unit 3 minutes later starts EMERGENCY OPERATION Replace the compressor Clarify the causes by counting time until the inverter stops 010 10 seconds compressor rare short 10 to 60 seconds compressor lock
96. witch Indoor unit does not operate When OPERATION INDICATOR lamp flashes ON and OFF in every 0 5 second Outdoor unit doesn t operate How to check mis wiring and serial signal error when outdoor unit does not work C Turn OFF the power supply Is there rated voltage No the power supply Yes Turn ON the power supply Is there rated voltage between outdoor terminal block S1 and S2 Yes Check the power supply Check the wiring Press EMERGENCY OPERATION switch once v Does the left lamp of OPERATION INDICATOR lamp light up Confirmation of the power to the indoor unit Yes 15 serial signal error indicated 6 minutes later Yes lt No Is there any mis wiring No poor contact or wire disconnection of the Make them corre indoor outdoor connecting wire No v A i Inverter P C board Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not mis wiring Short circuit outdoor terminal block S2 and Heel Parts side LEDO Blinking Outdoor electronic control P C board Parts side LED2 LED1 V Lighted Blinking A Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again Press EM

SERVICE MANUAL MUZ-A09NA MUZ-A09NA- MUZ

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