Home

SERVICE MANUAL

1. Deleting the memorized abnormal condition After repairing the unit recall the failure mode again according to Setting up the failure mode recall function mentioned above Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted Release the failure mode recall function according to Releasing the failure mode recall function mentioned above NOTE 1 Make sure to release the failure mode recall function once it is set up otherwise the unit cannot operate properly 2 If the abnormal condition is not deleted from the memory the last abnormal condition is kept memorized 3X2 Blinking pattern when the indoor unit is abnormal Blinking at 0 5 Blinking at 0 5 2 5 second OFF second interval 2 5 second OFF second interval 4 gt lt gt lt gt lt OFF it gt it gt gt Beeps Repeated cycle Repeated cycle Repeated cycle t A 3 Blinking pattern when the outdoor unit is abnormal Blinking at 0 5 Blinking at 0 5 2 5 second OFF 3 second ON second interval 2 5 second OFF 3 second ON second interval E at e 4 a q OFF gt oOo gt No beep
2. Y Does the unit operate for 10 minutes or more Ce showing thermistor abnormality Dr Replace the inverter F C board Yes OK Cause is poor contact Thermistor Connector Pin No Defrost Between CN641 pin1 and pin2 Discharge temperature Between CN641 pin3 and pin4 Fin temperature Between CN642 pin1 and pin2 Inverter P C board Ambient temperature Between CN643 pin1 and pin2 Outdoor heat exchanger temperature Between CN644 pin1 and pin3 Check of coil First of all measure the resistance of R V coil to check if the coil is defective Refer to 10 4 x In case CN721 is disconnected or coil is open voltage is generated between the terminal pins of the connector although no signal is being transmitted to R V coil Check if CN721 is connected Unit operates COOL mode even if it is set to HEAT mode Disconnect connector CN61 between the compressor and the Is there 230 VAC between CN7210 and intelligent power module Turn ON the power supply and press EMERGENCY OPERATION Switch twice HEAT mode Yes Replace the 4 way valve A Replace the inverter on the inverter P C board 3 minutes No IPC board after the power supply is turned ON Unit operates HEAT mode even if it is set to COOL mode Disconnect connector CN61 between the compressor and the intelligent power module Is there 230 VAC between CN7210
3. ag 88 165 420 2 160 8 Qa i rccte a 2 9 380 amp 150 2 5 145 75 340 SS 9140 135 300 130 125 260 120 6870 75 80 85 90 95 100 105 F 6870 75 80 85 90 95 100 105 F Outdoor ambient temperature Outdoor ambient temperature MUZ FE12NA PSIG 580 540 PSIG a 500 180 175 460 170 o 2 o 165 indoor DB temperature F Es 420 2160 o 155 80 380 8 150 145 340 9140 core 135 300 130 70 125 260 120 6870 75 80 85 90 95 100 105 F 6870 75 80 85 90 95 100 105 F Outdoor ambient temperature Outdoor ambient temperature Heating Data is based on the condition of outdoor humidity 7596 Air flow should be set to High speed Data is for heating operation without any frost MUZ FEO9NA PSIG PSIG 400 170 75 380 PG 160 0 360 ger 75 150 dev 70 340 Uo 65 140 21920 2 130 Ki 5 a ON 2 300 8 S o 5 120 5 2 280 ON
4. peras ak UN emu MCU MA LU es s TE OVER SUPPLY 1 1 ES ho Tw phase Go INVERTER P C BOARD chup 49321999 116 o 913 15 99 000000 a re NT NOTES VERG ME EE B a as a spe x TB2 1 About the indoor side electric 3 4 x RED From INDOOR UNIT wiring refer to the indoor t t t 6 53 CONNECTING WIRES unit electric wiring diagram T64 RT68 T65 RTG for servicing MF INDOOR UNIT 2 Use copper conductors only Sl CONNECTING WIRES For field wiring LEV 308 230 1 phase 60Hz SYMBOL NAME SYMBOL NAME SYMBOL NAME CT CURRENT TRANSFORMER L62 CMC COIL RTGB OUTDOOR HEAT EXCHANGER C61 C62 C63 SMOOTHING CAPACITOR LEV EXPANSION VALVE COIL TEMP THERMISTOR 0861 0865 DIODE MODULE MC COMPRESSOR 2 TERMINAL BLOCK DSA SURGE ABSORBER MF FAN MOTOR TR821 SWITCHING POWER TRANSISTOR F701 F801 F901 FUSE T3 15AL250V PTC64 PTC65 CIRCUIT PROTECTION T801 TRANSFORMER H DEFROST HEATER OPTION PARTSI RT61 DEFROST THERMISTOR X63 X64 X66 RELAY 10800 INTELLIGENT POWER DEVICE RT62 DISCHARGE TEMP THERMISTOR 2154 REVERSING VALVE COIL IPM 1C932 INTELLIGENT POWER MODULE RT64 FIN TEMP THERMISTOR 26H HEATER PROTECTORIOPT ION PARTS L61 REACTOR RT65 AMBIENT TEMP THERMISTOR 6 REFRIGERANT SYSTEM DIAGRAM MUZ FEO9NA MUZ FE12NA Unit inc
5. 0 0 9 o df o une pressor 500 J 5 ES LDU SS y zum PP S HAC 208 230 V LDV T pt 220 QE EN LDW Om Paes Iu PU gl E INI be appi CIR s ENDO MI Be 4 O ao 0 X s RE at P DEN B cm D I QC INDE SIS Pede ULP 2 op SES 84 epu Ld p EN Le LZ Ng 0 1 8 is QD i gi DON PUR e 44 8 88 oo 5 od Qu v 5 LED LEV Jumper wire for Jumper wire ait eg 5 2 3 connector changing defrost for pre heat OL 2 f 29 5 59 EI Boy CN724 setting JS control setting Front side of unit 22 EDN 9 er 22 JK sgg ST 5 Se FES 25 ox co 2ga 9 O 22 gu cp PSS 52 500 SES LE g coz 7 OES 35 g 250 2900 og 6 sx 5 Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat exchanger temperature thermistor RT68 Fin temperature thermistor RT64 200 Le ELS ALL LL LLL RE ess EWERSEEN Discharge temperature thermistor RT62 0 ESSE ES EST AAAI I A 0 0 Mi 0 4 14 32 50 68 86 104 a 32 50 68 86 104 122 140 158 176 Temperature F Temperature F Temperature F Resistance kQ Resistance kQ 29 11 DISASSEMBLY INSTRUCTIONS Terminal with locking mechanism Detaching points The terminal which has the l
6. RED RED ORN YLW BRN BRN BLU 37 540 20 10 5 TROUBLESHOOTING FLOW A How to check inverter compressor Disconnect the connector CN61 between em and the intelligent power module IPM Y Check the voltage between terminals e See 10 5 Check of open phase Y Are the voltages balanced No Replace the inverter P C board Yes Check the compressor eM See 10 5 Check of compressor Check of open phase e With the connector between the compressor and the intelligent power module disconnected activate the inverter and check if the inverter is normal by measuring the balance of voltage between the terminals Output voltage is 50 130 V The voltage may differ according to the tester lt lt Operation method Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit TEST RUN OPERA TION Refer to 7 6 Measurement point at 3 points BLK U WHT V BLK U RED W WHT V RED W Measure AC voltage between the lead wires at 3 points NOTE 1 Output voltage varies according to power supply voltage 2 Measure the voltage by analog type tester 3 During this check LED of the inverter P C board flashes 9 times Refer to 10 6 1 O Check of compressor Refer to 10 5
7. Refer to 10 5 How to check in verter compressor eCheck stop valve 3 time flash 2 5 seconds OFF Discharge tempera ture overheat protec4 tion Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if dis charge temperature thermistor reads 212 F 100 C or less 3 minutes later Check refrigerant circuit and refrig erant amount Refer to 10 5 Check of LEV 4 time flash 2 5 seconds OFF Fin temperature P C board tem perature thermistor overheat protection Temperature of fin temperature thermistor on the heat sink exceeds 167 176 F 75 80 C or temperature of P C board temperature thermistor on the inverter P C board exceeds 158 167 F 70 75 C Check around outdoor unit Check outdoor unit air passage Refer to 10 5 Check of outdoor fan motor 5 time flash 2 5 seconds OFF High pressure pro tection Temperature of indoor coil thermistor exceeds 158 F 70 C in HEAT mode Temperature of outdoor heat exchanger tempera ture thermistor exceeds 158 F 70 C in COOL mode Check refrigerant circuit and refrig erant amount Check stop valve 8 time flash 2 5 seconds OFF Compressor syn chronous abnormal ity The waveform of compressor current is distorted Reconnect connector of compres Sor Refer to 10 5 How to check in verter compressor 10 time flash 2 5 secon
8. 1 The location of LED is illustrated at the right figure Refer to 10 6 1 2 LED is lighted during normal operation The flashing frequency shows the number of times the LED blinks after every 2 5 second OFF Flashing Example When the flashing frequency is 2 2 5 second OFF 0 5 second ON wa 0 5 second ON 18 Check refrigerant circuit and refrig erant amount Refer to 10 5 Check of LEV Refer to 10 5 Check of outdoor thermistors Inverter P C board Parts side LED Flashing Symptom LED indication Abnormal point Condition Condition Remedy Outdoor unit operates 7 time flash 2 5 seconds OFF Low discharge tem perature protection Temperature of discharge temperature thermistor has been 122 F 50 C or less for 20 minutes Refer to 10 5 Check of LEV Check refrigerant circuit and refrig erant amount 8 time flash 2 5 seconds OFF PAM protection PAM Pulse Ampli tude Modulation The overcurrent flows into IGBT Insulated Gate Bipolar tran sistor TR821 or the bus bar voltage reaches 320 V or more PAM stops and restarts This is not malfunction PAM protec tion will be activated in the following cases 1 Instantaneous power voltage drop Short time power failure 2 When the power supply voltage is high 9 time flash 2 5 seconds OFF Inverter check mode The connector of compressor is disconnected invert
9. 4 Pull out the defrost thermistor from its holder See Photo 6 5 Pull out the outdoor heat exchanger temperature thermistor from its holder See Photo 6 6 Pull out the ambient temperature thermistor from its holder 31 Photo 3 Screws of the relay panel Photo 4 Inverter assembly Inverter P C board Screw of the T B support Heat sink T B support Screw of the ground wire Photo 5 R V coil Discharge temperature thermistor OPERATING PROCEDURE PHOTOS 5 Removing outdoor fan motor Photo 6 Outdoor heat 1 Remove the cabinet and panels Refer to 1 exchanger tempera 2 Disconnect the connectors for outdoor fan motor ture thermistor 3 Remove the propeller nut See Photo 7 4 Remove the propeller See Photo 7 5 Remove the screws fixing the fan motor See Photo 7 6 Remove the fan motor Removing the compressor and 4 way valve 1 Remove the cabinet and panels Refer to 1 2 Remove the inverter assembly Refer to 2 3 Recover gas from the refrigerant circuit NOTE Recover gas from the pipes until the pressure gauge shows 0 PSIG Defrost thermistor 4 Detach the welded part of the suction and the discharge pipe connected with compressor 5 Remove the nuts of compressor legs 6 Remove the compressor Photo 7 Screws of the outdoor fan motor 7 Detach the welded part of pipes connected with 4 way Y valve See Photo 8 Photo 8 Propeller Propeller nu
10. Expansion valve ON the power supply Preparation of the remote controller While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button First release RESET button And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 1 Y 1 Regardless of normal or abnormal condition a short beep Expansion valve operates in full opening direction Ie mittoc once de signalis received Y Do you hear the expansion valve click click oM 7 Do you feel the expansion valve vibrate Yes on touching it No Y Is LEV coil properly fixed to Properly fix the LEV coil to the expansion valve the expansion valve No Yes Measure each voltage between connector pins of CN724 on the inverter P C board Y 1 Pin Pin Does the resistance of LEV 2 Pin Pin have the characteristics ves gt 3 Pin Pin pee the inverter P C Refer to 10 4 4 Pin No Is there about 3 5 VAC between each NOTE Measure the voltage by an analog tester Replace the LEV coil este Yes
11. Replace the expansion valve NOTE After check of LEV do the undermentioned operations 1 Turn OFF the power supply and turn ON it again 2 Press RESET button on the remote controller 25 D Check of inverter P C board Check the outdoor fan motor Refer to 10 5 0 Y T the fuse F901 blown on the in verter P C board Yes No y Inverter P C board Check the connection of the connectors Solder side CN932 of the outdoor fan motor If the connection is poor make it correct CN932 Operate the outdoor unit by starting EMERGENCY OPERATION Check the LED indication on the in Check the remedy following LED verter P C board N indication Does the LED flash 10 times Refer to 10 3 Yes 10 time flash Replace the inverter P C board lt 26 How to check miswiring and serial signal error Tum OFF the power supply E Y Is there rated voltage in the power supply No Check the power supply Y Yes Turn ON the power supply Y No lt Is there rated voltage between outdoor terminal block 51 and S2 Check the wiring yres Press EMERGENCY OPERATION switch once Y Does the OPERATION INDICATOR lamp light up Confirmation of the power to the indoor unit No Yes OUR Y Is there any misw
12. Check of compressor winding N Replace the compressor Is the compressor normal pes Refer to 10 5 Check of compressor operation time No Refer to 10 5 Check of compressor start failure Does the compressor operate continuously Yes D Check of compressor winding e Disconnect the connector CN61 between the compressor and intelligent power module and measure the resistance be tween the compressor terminals Measurement point gt gt at 3 points BLK WHT BLK RED Measure the resistance between the lead wires at 3 points WHT RED lt lt Judgement gt gt Refer to 10 4 o O verre Abnormal short Infinite Abnormal open NOTE Be sure to zero the ohmmeter before measurement E Check of compressor operation time lt lt Judgement gt gt eConnect the compressor and activate the inverter Then measure 0 second the time until the inverter stops due to over current lt lt Operation method gt gt 1 second Abnormal Start heating or cooling operation by pressing EMERGENCY Eon failure diseno OPERATION switch on the indoor unit 2 seconds prnpreseorwinding sH n TEST RUN OPERATION Refer to 7 6 Abnormal lt lt Measurement gt gt Stating dete lock out Measure the time from the start of compressor to the stop of Starting defect compressor due to overcurrent Abnormal Poor contact 10 seconds Outdoor P C board d
13. Indoor 80 FDB 67 FWB Outdoor 95 FDB 75 FWB Indoor 70 FDB 60 FWB Outdoor 17 FDB 15 FWB Rated frequency Rated frequency Maximum frequency Test condition 3 4 Indoor air condition F Outdoor air condition F Test i Dry bulb Wet bulb Dry bulb Wet bulb A 2 Cooling Steady State at rated compressor Speed B 2 Cooling Steady State at rated compressor Speed 80 67 95 75 80 67 82 65 SEER 1 Cooling Steady State Cooling at minimum compressor Speed 80 67 82 65 F 1 Cooling Steady State at minimum compressor Speed E V Cooling Steady State at Intermediate compressor Speed k5 H1 2 Heating Steady State at rated compressor Speed H3 2 Heating at rated compressor Speed 1 Heating Steady State Heating at minimum compressor Speed H1 1 Heating Steady State at minimum compressor Speed H2 V Heating at Intermediate compressor Speed 5 80 67 67 53 5 80 67 87 69 70 60 47 43 70 60 17 15 70 60 62 70 60 47 70 60 35 3 amp 5 At Intermediate compressor Speed Cooling rated compressor speed minimum compressor speed 3 minimum compressor speed OPERATING RANGE 1 POWER SUPPLY Rated voltage Guaranteed voltage V 208 230 V Min 187 208 230 Max 253 Outdoor unit 1 phase 60 Hz 2 OPERATION Intake air temperature F Condition Indo
14. Power consumption Cooling 1 580 160 650 930 160 960 Rated Minimum Maximum Heating 47 1 710 150 2 250 950 150 2 250 Power consumption Rated Heating 17 2 1 730 1 780 EER 1 SEER x3 Cooling 15 5 26 0 12 9 23 0 Heating 10 0 10 6 Heating x1 4 50 4 20 V phase Hz 208 230 1 60 Max fuse size time delay A 15 Min circuit ampacity A 12 Fan motor F L A 0 56 SNB130FQAH R L A 8 6 Compressor LRA 10 8 Refrigeration oil cc Model 450 NEO22 Refrigerant control Linear expansion valve Cooling dB A Sound level 31 Heating dB A Defrost method Reverse cycle W 31 1 2 D 11 1 4 H 21 5 8 80 External finish M unsell 3Y 7 8 1 1 Remote controller Wireless type Control voltage by built in transformer 12 24 Refrigerant piping Not supplied Refrigerant pipe size Liquid 1 4 0 0315 Min wall thickness Gas 3 8 0 0315 Indoor Flared Connection method Outdoor Flared Between the indoor amp Height difference 40 outdoor units Piping length 65 Refrigerant charge R410A NOTE Test conditions are based on ARI 210 240 3 amp 1 Rating conditions Heating 3X2 Heating Indoor 70 FDB 60 FWB Outdoor 47 FDB 43 FWB Cooling
15. defective parts Deleting the memorized abnormal condition After repairing the unit recall the failure mode again according to Setting up the failure mode recall function 10 2 1 Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted Release the failure mode recall function according to Releasing the failure mode recall function men tioned above NOTE 1 Make sure to release the failure mode recall function once it is set up otherwise the unit cannot operate properly 2 If the abnormal condition is not deleted from the memory the last abnormal condition is kept memorized 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 4 ie eg e e st ee Muir dp OFF gt lt gt gt 14 51 4 o o la i Beeps pie No beep Beeps pie Repeated cycle Repeated cycle Repeated cycle 16 3 Outdoor unit failure mode table POWER lamp Indoor unit Abnormal point Failure mode protection LED indication Outdoor P C board Condition Indoor outdoor unit failure mode recall function Outdoor unit failur
16. 2 110 260 3 at o 100 NS 0 58 2 90 220 200 80 180 70 160 60 140 50 120 40 15 10 5 10 15 20 25 30 35 40 45 50 55 60 6570 15 10 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Outdoor ambient temperature Outdoor ambient temperature MUZ FE12NA PSIG PSIG 400 70 3E 380 e 60 70 360 sar 75 65 e 50 340 oe 70 doso 65 40 o 320 KA g 30 TON S E 300 5 120 a 2110 ge 2 260 p 100 5 5 58Hz amp 90 58 2 220 200 80 180 70 160 60 140 50 120 40 15 10 5 10 15 20 25 30 35 40 45 50 55 60 6570 F 15 10 5 10 15 20 25 30 35 40 45 50 55 60 6570 Outdoor ambient temperature Outdoor ambient temperature 10 2 7 4 STANDARD OPERATION DATA MSZ FE09NA MSZ FE12NA Cooling Heating Cooling Heating Capacity 9 000 10 900 12 000 13 600 SHF 0 76 0 73 Input 0 580 0 710 0 930 0 950 Rated frequency 34 42 51 52 5 Indoor unit MSZ FE09NA MSZ FE12NA Power supply 208 230 1 60 Input 0 018 0 024 0 024 0 030 Fan motor current 0 19 0 17 0 25 0 23 0 25 0 23 0 32 0 29 Outdoor unit MUZ FE09NA MUZ FE12NA Electrical circuit Power supply 208 230 1 60 Input 0 562 0 686 0 906 0 920 Comp current 2 38 2 15 2 98 2 70 4 05 3 66 4 12 3 72 Fan motor current 0 35 0 32 Condensing pressure 376 355 402 392 Suction pressure 154 108 148 104 Discharge temperature E 142 145 160 158 Condensing temperature 112 108 117 115 Suction temp
17. Changes for the Better MITSUBISHI ELECTRIC SPLIT TYPE AIR CONDITIONERS OUTDOOR UNIT SERVICE MANUAL R410A No OBH543 Models Indoor unit service manual MSZ FE NA Series OBH542 CONTENTS 1 TECHNICAL CHANGES 2 2 PART NAMES AND FUNCTIONS 2 3 SPECIFIGATION S 3 4 OUTLINES AND DIMENSIONS 5 5 WIRING DIAGRAM 6 REFRIGERANT SYSTEM DIAGRAM 6 SU SS CLE ER C sn 7 8 ACTUATOR 13 9 SERVICE FUNCTIONS 14 10 TROUBLESHOOTING enn 14 11 DISASSEMBLY INSTRUCTIONS 30 PARTS CATALOG OBB542 TM NOTE S RoHS compliant products have G mark on the spec name plate e 1 TECHNICAL CHANGES MUZ FEO9NA MUZ FE12NA 1 New model 2 PART NAMES AND FUNCTIONS MUZ FEO9NA MUZ FE12NA Airinlet Drain hose D Airoutlet C Drain outlet Outdoor unit model MUZ FEO9NA SPECIFICATION MUZ FE12NA Capacity Cooling 1 9 000 2 800 9 000 12 000 2 800 12 000 Rated Minimum Maximum Heating 47 1 10 900 3 000 18 000 13 600 3 000 21 000 Capacity Rated Heating 17 3 amp 2 12 500 13 600
18. F 100 C or less 3 minutes later eCheck refrigerant circuit and refrigerant amount Refer to 10 5 Check of LEV High pressure Temperature of indoor coil thermistor exceeds 158 F 70 C in HEAT mode Temperature of defrost thermistor exceeds 158 F 70 C in COOL mode Check refrigerant circuit and refrigerant amount eCheck stop valve Fin temperature P C board temperature 7 time flash 2 5 seconds OFF Temperature of fin temperature thermistor on the inverter P C board exceeds 167 176 F 75 80 C or temperature of P C board temperature thermistor on the inverter P C board exceeds 158 167 F 70 75 C eCheck around outdoor unit eCheck outdoor unit air passage Refer to 10 5 D Check of outdoor fan motor 8 time flash 2 5 seconds OFF Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start up Refer to 10 5 D Check of outdoor fan motor Refer to 10 5 0 Check of inverter P C board 9 time flash 2 5 seconds OFF Nonvolatile memory data 5 time flash 2 5 seconds OFF Nonvolatile memory data cannot be read properly Replace the inverter P C board 10 time flash 2 5 seconds OFF Discharge temperature Temperature of discharge temperature thermistor has been 122 F 50 C or less for 20 minutes Refer to 10 5 Check of LEV Check refrigerant circuit and refrigerant amount 11
19. K gt To activate the pre heat control cut the JK wire of the inverter P C board Refer to 10 6 1 NOTE When the inverter P C board is replaced check the Jumper wires and cut solder them if necessary 10 TROUBLESHOOTING MUZ FEO9NA MUZ FE12NA 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 miswiring 2 Take care of the following during servicing 1 Before servicing the air conditioner be sure to turn OFF the main unit first with the remote controller then after con firming the horizontal vane is closed turn off the breaker and or disconnect the power plug 2 Be sure to turn OFF the power supply before removing the front panel the cabinet the top panel and the electronic control P C board 3 When removing the electrical parts be careful of the residual voltage of smoothing capacitor 4 When removing the electronic control P C board hold the edge 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 TROL gt 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
20. and Turn ON the power supply and on the inverter P C board minutes press EMERGENCY OP RATION after the power supply is turned ON switch once COOL mode No Replace the 4 way valve Replace the inverter Yes P C board 23 D Check of outdoor fan motor Disconnect CN932 from the inverter P C board an measure the resistance of the outdoor fan motor 9 Is the outdoor fan motor normal Refer to 10 4 No Replace the outdoor fan motor Yes Replace the inverter P C board J Check of power supply Disconnect the connector CN61 between compressor and intelligent power module Turn ON power supply and press EMERGENCY OPERATION switch Y Does POWER lamp on the indoor gt unit light up No Yes y s there voltage 260 325 VDC between DB61 and DB61 on Sc the inverter P C board Yes Refer to 10 6 1 E Check the electric parts in main circuit Rectify indoor outdoor connecting wire Yes Is there voltage 208 230 VAC between the indoor terminal Replace the indoor electronic control P C block S1 and S2 No board Dose LED on the inverter P C board light up or flash Refer No to 10 6 1 260 325VDC hee If light up OK If flash refer to 10 3 OF Inverter P C board Solder side 24 Check of LEV
21. ard A Turn OFF inverter controlled lighting equipment Turn OFF the power supply and then turn ON again Press EMERGENCY OPERATION Switch Reinstall either the unit or the light away from each other Attach a filter on remote control receiv ing section Is serial signal error indicated 6 minutes later of the indoor unit 27 N Electromagnetic noise enters into sets or radios Is the unit grounded No Ground the unit Yes Is the distance between the antennas and the indoor unit within 9 91 ft or is the distance between the antennas and Yes the outdoor unit within 9 91 ft No Extend the distance between the antennas and the indoor unit and or the antennas and the outdoor unit radios and the indoor unit within 3 28 Extend the distance between the TV sets and or ft or is the distance between the TV radios and the indoor unit or the TV sets or sets or radios and the outdoor unit Yes radios and the outdoor unit within 9 91 ft Is the distance between the TV sets or No Are the antennas damaged Is the coaxial cable damaged Replace or repair the antenna Is there any poor contact in the anten Yes Replace or repair the coaxial cable na wiring Is the indoor outdoor connecting wire Extend the distance between the indoor outdoor of the air conditioner and the wirin
22. beep is emitted once the signal is received Does POWER lamp on the indoor unit blink at the interval of Indoor unit is normal 0 5 seconds But the outdoor unit might be abnormal because there are some abnor Blinks Either indoor or outdoor unit is abnormal Beep is emit No malities that can not be recalled with this way ted at the same timing as the blinking of POWER lamp OFF Confirm if outdoor unit is abnormal according to the detailed outdoor x2 unit failure mode recall function Refer to 10 2 2 Yes Judgment of indoor outdoor abnormality Before blinking does POWER lamp stay ON for 3 seconds Stays ON for 3 seconds without beep The outdoor unit is abnormal es 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 3 Pas Releasing the failure mode recall function y Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Press RESET button of the remote controller y Repair the defective parts
23. door intake air DB temperature F Heating MUZ FE09NA MUZ FE12NA 12 Airflow 381 CFM 6570 75 PS Airflow 420 CFM 65 OQ E ad 75 e SE gt 10 314 5 g3 9o 12 ga 5 8 gr NE 10 Er o Sk D x 8 6 c 4 S 4 a 3 E 5 2 2 2 8 c 51 0 2 z 75 8 0 9 5 08 amp S 08 5S Poo ss E 5206 p eta 8 oe vw 0 5 a ox 8 04 NOM 0 4 nd 03 0 2 02 0 1 0 15 5 5 15 25 35 45 55 15 5 5 15 25 35 45 55 Outdoor intake air WB temperature F Outdoor intake air WB temperature F This value of frequency is not the same as the actual frequency in operating Refer to 7 5 and 7 6 for the relationships between frequency and capacity 7 3 CONDENSING PRESSURE Cooling Data is based on the condition of indoor humidity 50 95 Air flow should be set to High speed MUZ FEO9NA PSIG 580 540 o PSIG a 500 180 d 175 gt 460 170 DB
24. ds OFF Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds after outdoor fan start up Refer to 10 5 Check of outdoor fan motor Refer to 10 5 Check of inverter P C board 12 time flash 2 5 seconds OFF Each phase current of compressor Each phase current of compressor cannot be detected nor mally Refer to 10 5 How to check in verter compressor 13 time flash 2 5 seconds OFF DC voltage DC voltage of inverter cannot be detected normally Refer to 10 5 How to check in verter compressor Outdoor unit operates 1 time flash 2 5 seconds OFF Frequency drop by current protection Current from power outlet is nearing Max fuse size The unit is normal but check the following 3 time flash 2 5 seconds OFF Frequency drop by high pressure pro tection Temperature of indoor coil thermistor exceeds 131 F 55 C in HEAT mode compressor frequency lowers Check if indoor filters are clogged Check if refrigerant is short Check if indoor outdoor unit air cir culation is short cycled Frequency drop by defrosting in COOL mode Indoor coil thermistor reads 46 F 8 C or less in COOL mode compressor frequency lowers 4 time flash 2 5 seconds OFF Frequency drop by discharge tempera ture protection Temperature of discharge temperature thermistor exceeds 232 F 111 C compressor frequency lowers NOTE
25. e 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 The compressor starts with operational frequency The fan speed of the indoor unit is High This operation continues for 30 minutes In order to release this operation press the EMERGENCY OPERATION switch twice or once or press any button on the remote controller 7 2 PERFORMANCE CURVE Cooling MUZ FE09NA MUZ FE12NA SHF at rating condition 0 76 SHF at rating condition 0 73 9 9 Airflow 307 Airflow 350 In 13 15 doo Indoor tar r j 14 j aj Ez 12 lake aj We Be 1 Fl WB ten 3 E Sratur ga Ure g 12 F S210 s E 59 9 n ge 1 71 SX s 67 Sg X 10 er 7 63 9 2 95 a amp 12 og B o xm 5 se n i eM LA 63 ss 1869 8g 0 a 63 A Cg oor i 5 06 5 09 8 8 a 0 5 0 7 65 75 85 95 105 115 E 65 75 85 95 105 115 Outdoor intake air DB temperature F Out
26. e mode recall function None Normal Outdoor power system Overcurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started Reconnect connectors Refer to 10 5 How to check inverter compressor Check stop valve Q Discharge temperature thermistor Defrost thermistor 1 time flash every 2 5 seconds Fin temperature thermistor 3 time flash 2 5 seconds OFF P C board temperature thermistor 4 time flash 2 5 seconds OFF Ambient temperature thermistor 2 time flash 2 5 seconds OFF Thermistor shorts or opens during compressor running Refer to 10 5 G Check of outdoor thermistors Defective outdoor thermistors can be identified by checking the blinking pattern of LED Overcurrent 11 time flash 2 5 seconds OFF Large current flows into intelligent power module Reconnect compressor connector Refer to 10 5 How to check inverter compressor eCheck stop valve Compressor synchronous abnormality Compressor start up failure protection 12 time flash 2 5 seconds OFF Waveform of compressor current is distorted Reconnect compressor connector Refer to 10 5 How to check inverter compressor Discharge temperature Temperature of discharge temperature thermistor exceeds 241 F 116 C compressor stops Compressor can restart if discharge temperature thermistor reads 212
27. efect Disconnected connector Abnormal Refrigerant circuit defect Closed valve 10 minutes F Check of compressor start failure Confirm that 1 4 is normal Electrical circuit check 1 Contact of the compressor connector including CN61 2 Output voltage of inverter P C board and balance of them See 10 5 3 Direct current voltage between DB61 and on the inverter P C board V 4 Voltage between outdoor terminal block 51 52 Does the compressor run for 10 seconds or Check the refrigerant circuit more after it starts Yes Check the stop valve After the compressor is heated with a drier does the compressor start x1 No Replace the compressor Yes Compressor start failure Activate pre heat control Meat the compressoriwith Refer to 9 2 PRE HEAT CONTROL SETTING ader forabout 20 minutes Do not recover refrigerant gas while heating Heating part Check of outdoor thermistors Disconnect the connector of thermistor in the outdoor P C board see below table and measure the resistance of thermistor r s the thermistor normal Refer to 10 6 1 5 Replace the thermistor except RT64 When RT64 is Yes abnormal replace the inverter P C board Y Reconnect the connector of thermistor Turn ON the power supply and press EMERGENCY OPERATION switch
28. er check mode starts 19 Check if the connector of the com pressor is correctly connected Refer to 10 5 How to check in verter compressor 10 4 TROUBLE CRITERION OF MAIN PARTS MUZ FEO9NA MUZ FE12NA Part name Check method and criterion Defrost thermistor RT61 Ambient temperature thermistor RT65 Outdoor heat ex changer temperature thermistor RT68 Measure the resistance with a tester Refer to 10 6 Test point diagram and voltage 1 Inverter P C board the chart of thermistor Discharge tem perature thermistor RT62 Fin temperature thermistor RT64 Measure the resistance with a tester Before measurement hold the thermistor with your hands to warm it up Refer to 10 6 Test point diagram and voltage 1 Inverter P C board the chart of thermistor Compressor Measure the resistance between terminals using a tester Winding temperature 4 104 F 20 40 C 1 52 2 17 Q Outdoor fan motor Measure the resistance between lead wires using a tester Part temperature 14 104 F 10 40 C Color of lead wire RED BLK BLK WHT WHT RED V coil 2154 Measure the resistance using a tester Part temperature 14 104 F 10 40 C Normal 0 97 1 38 kQ Expansion valve coil LEV Measure the resistance using a tester Part temperature 14 104 F 10 40 C Color of lead wire Normal WHT
29. erature 53 36 53 34 Comp shell bottom temperature 144 128 146 129 Ref pipe length 25 Refrigerant charge 410 2 10 9 oz 80 80 67 67 59 58 56 55 Fan speed High 1 020 1 120 Airflow High 307 Wet 350 Wet 95 95 Refrigerant circuit Intake air temperature Discharge air temperature Indoor unit Intake air temperature Fan speed Airflow Outdoor unit 11 7 5 CAPACITY AND INPUT CORRECTION BY INVERTER OUTPUT FREQUENCY Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 15 2 0 E 2 9 3 0 S 5 1 E 510 S 5 5 5 E Beo o o 1 o 5 205 9 05 2 9 8 3 8 510 So a a c 150 Hz 100 150 Hz 0 50 100 150 Hz 0 50 100 150 Hz The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor Correction of Cooling capacity Correction of Cooling total input Correction of Heating capacity Correction of Heating total input 1 5 1 5 15 2 2 g 9 9 p o 5 o E s 5 5 1 0 1 0 S 1 0 9 5 9 5 5 61 205 9 05 P05 8 5 9 5 a o TR o 10 150 Hz 50 100 150 Hz 50 100 150 Hz 0 50 100 150 Hz The ope
30. g of connecting wire of the air conditioner and the wir the antennas close Yes ing of the antennas Even if all of the above conditions are fulfilled the electromagnetic noise may enter depending on the electric field strength or the installation condition combination of specific conditions such as antennas or wiring Check the followings before asking for service Devices affected by the electromagnetic noise TV sets radios FM AM broadcast shortwave Channel frequency broadcast station affected by the electromagnetic noise Channel frequency broadcast station unaffected by the electromagnetic noise Layout of indoor outdoor unit of the air conditioner indoor outdoor wiring grounding wire antennas wiring from antennas receiver Electric field intensity of the broadcast station affected by the electromagnetic noise Presence or absence of amplifier such as booster Operation condition of air conditioner when the electromagnetic noise enters in 1 Turn OFF the power supply once and then turn ON the power supply In this situation check for the electromagnetic noise 2 Within 3 minutes after turning ON the power supply press OPERATE STOP ON OFF button on the remote controller for power ON and check for the electromagnetic noise 3 After a short time 3 minutes later after turning ON the outdoor unit starts running During operation check for the elec tromagnetic noise 4 Press OPERATE STOP ON OFF button on t
31. h 4 way valve Refrigerant pipe 03 8 with heat insulator Muffler Outdoor heat exchanger temperature Stop valve N thermistor with service port Outdoor RT68 Flared connection Discharge heat temperature i exchanger thermistor Ambient temperature thermistor RT65 Defrost thermistor RT61 Capillary tube O D 0 118 1 0 0 071 x 23 5 8 93 0 x 01 8 x 600 Strainer Flared connection Expansion 100 Stop valve valve with strainer R V coil heating ON cooling OFF Capillary tube 0 118 I D 0 079 Refrigerant pipe 21 4 x 97A with heat insulator 03 0 x 55 x 240 Refrigerant flow in cooling Refrigerant flow in heating MAX REFRIGERANT PIPING LENGTH and MAX HEIGHT DIFFERENCE Refrigerant piping ft Piping size O D in Model i i oce Max Ang Max ui difference Liquid MUZ FEO9NA MUZ FE12NA 65 40 3 8 1 4 Indoor unit Max Height difference B Max Length A Outdoor unit ADDITIONAL REFRIGERANT CHARGE R410A oz NOTE Refrigerant piping exceeding 25 ft requires additional refrigerant charge according to the calculation Refrigerant piping length one way ft 30 40 50 60 Model Outdoor unit precharged MUZ FEO9NA MUZ FE12NA 2 lb 9 oz 1 62 4 86 8 10 11 34 Calculation X oz 1 62 5 oz ft x Refrigerant piping
32. he 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 28 10 6 TEST POINT DIAGRAM AND VOLTAGE 1 Inverter P C board MUZ FEOONA MUZ FE12NA Smoothing Smoothing Smoothing itor capacitor capacitor F701 Back side of unit DB61 701 260 325 63 C62 C61 250 V3 15 A AC 208 230 V Fuse F801 250 V 3 15A RV coil LES CN721 dresa us 208 230 VAC es JEN E EU Vs ROB PI SE THEME es Ks Fuse F901 i 250 V 3 15 0 2 d n d ba ra isaL250v m 79 ri o oji 9 Output to q v ot 5 g 5 drive com Hs 2 1 Ph odho 8
33. i Beeps RT No beep Da Repeated cycle Repeated cycle i Repeated cycle 15 2 Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal Confirm if outdoor unit is abnormal according to the following procedures Y Confirm that the remote controller is in the failure mode recall function With the remote controller headed towards the indoor unit press TOO COOL or TOO WARM button to adjust the set temperature to 77 F 25 C x1 x1 Regardless of normal or abnormal condition 2 short beeps are emitted as the signal is received Y Does POWER lamp on the indoor unit blink at the interval of 0 5 seconds Blinks The outdoor unit is abnormal Beep is emitted at the same timing as the blinking of POWER OFF lamp X2 Yes Blinks The outdoor unit is abnormal Check the blinking pattern and confirm the abnormal point with the out door unit failure mode table 10 2 3 Make sure to check at least two consecutive blinking cycles X2 The outdoor unit is normal Releasing the failure mode recall function Release the failure mode recall function by the following procedures Turn OFF the power supply and turn it ON again Release the failure mode recall function accord Press RESET button of the remote controller ing to the left mentioned procedure Y Repair the
34. indication is flashing on and off before starting service work 2 Before servicing check that the connector and terminal are connected properly 3 When the electronic control P C board seems to be defective check the copper foil pattern for disconnection and the components for bursting and discoloration 4 Refer to 10 2 and 10 3 14 10 2 FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once Even though LED indication listed on the troubleshooting check table 10 3 disappears the memorized failure details can be recalled 1 Flow chart of failure mode recall function for the indoor outdoor unit Operational procedure The cause of abnormality cannot be found because the abnormality does not recur Setting up the failure mode recall function Y Turn ON the power supply Preparation of the remote controller While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time press RESET button First release RESET button And release the other two buttons after all LCD in operation display section of the remote controller is displayed after 3 seconds Y Press OPERATE STOP ON OFF button of the remote controller the set temperature is displayed with the remote controller headed towards the indoor unit 1 y 3X1 Regardless of normal or ab normal condition a short
35. iring E A z poor contact or wire Is serial signal error indicated 6 minutes disconnection of the Correct them later No Yes indoor outdoor connect Yes ing wire No lt y A X1 Miswiring may damage indoor electronic control P C Y board during the operation Turn OFF the power supply Check once more if the indoor outdoor connecting wire is not miswiring Short circuit outdoor terminal block S2 Be sure to confirm the wiring is correct before the opera tion starts X3 Be sure to check this within 3 minutes after turning ON After 3 minutes LED blinks 6 times Even when the and S3 x1 inverter P C board or the outdoor electronic control P C Y board is normal LED blinks 6 times after 3 minutes Turn ON the power supply Is the bus bar voltage of the inverter P C board or the outdoor electronic control P C board normal Refer to TEST POINT DIAGRAM AND VOLTAGE in this manual No Yes Y Does the LED on the inverter P C board or the outdoor electronic control P C Replace the inverter P C board or the outdoor board repeat 3 6 second OFF and 0 8 second ON quick blinking x3 No electronic control P C board 2 Lighted Yes in rad X2 Be careful of the residual voltage of smoothing Y lighted capacitor Turn OFF the power supply Remove the short circuit between outdoor terminal block S2 and S3 Y Replace the indoor electronic control P C bo
36. late OPERATING PROCEDURE PHOTOS 2 Removing the inverter assembly inverter P C board 1 Remove the cabinet and panels Refer to 1 2 Disconnect the lead wire to the reactor and the following connectors Inverter P C board CN721 R V coil CN932 Fan motor CN641 Defrost thermistor and discharge temperature ther mistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor CN724 LEV 3 Remove the compressor connector CN61 4 Remove the screws fixing the relay panel See Photo 3 5 Remove the inverter assembly See Photo 4 6 Remove the screw of the ground wire and screw of the T B support See Photo 4 7 Remove the inverter P C board from the inverter assembly 3 Removing R V coil 1 Remove the cabinet and panels Refer to 1 2 Remove the R V coil See Photo 5 4 Removing the discharge temperature thermistor defrost thermistor outdoor heat exchanger tempera ture thermistor and ambient temperature thermistor 1 Remove the cabinet and panels Refer to 1 2 Disconnect the lead wire to the reactor and the following connectors lt Inverter P C board gt CN721 R V coil CN932 Fan motor CN641 Defrost thermistor and discharge temperature ther mistor CN643 Ambient temperature thermistor CN644 Outdoor heat exchanger temperature thermistor 3 Pull out the discharge temperature thermistor from its hold er See Photo 5
37. length ft 25 NOTE Refrigerant piping exceeding 25 ft requires additional refrigerant charge according to the calculation 7 DATA MUZ FEO9NA MUZ FE12NA 7 1 PERFORMANCE DATA 1 COOLING CAPACITY Indoor air Outdoor intake air DB temperature F 85 95 105 SHC TPC TC SHC TPC TC SHC 71 6 5 063 9 7 6 1 0 68 9 0 5 6 MUZ FEO9NA 67 7 74 0 60 9 0 68 065 84 64 63 8 8 8 1 0 58 8 5 7 6 062 77 69 71 8 2 0 94 7 7 101 72 MUZ FE12NA 67 9 5 0 89 8 8 0 96 8 1 63 10 5 0 85 9 7 0 92 8 9 NOTE 1 IWB Intake air wet bulb temperature TC Total Capacity x103Btu h SHC Sensible Heat Capacity x10 Btu h TPC Total Power Consumption kW 2 SHC is based on 80 F of indoor Intake air DB temperature 2 COOLING CAPACITY CORRECTIONS Refrigerant piping length one way ft 25 std 40 65 IWB MUZ FEO9NA MUZ FE12NA 1 0 0 954 0 878 3 HEATING CAPACITY Indoor air Outdoor intake air WB temperature F 5 25 35 43 TC TPC TC TPC TPC 75 7 9 0 66 9 4 0 73 0 77 MUZ FEO9NA 70 8 2 0 64 9 6 0 71 0 75 65 8 6 0 62 0 69 0 73 75 9 9 0 86 0 96 1 00 MUZ FE12NA 70 i 0 84 0 93 0 98 65 0 81 0 91 0 96 NOTE 1 IDB Intake air dry bulb temperature TC Total Capacity x103Btu h TPC Total Power Consumption kW 2 Abov
38. ocking mechanism can be detached as shown below There are two types refer to 1 and 2 of the terminal with locking mechanism The terminal without locking mechanism can be detached by pulling it out Check the shape of the terminal before detaching 1 Slide the sleeve and check if there is a locking lever or not 2 The terminal with this connector has the locking mechanism Slide the sleeve Hold the sleeve and the terminal while pull out the terminal pushing the locking slowly lever Connector 11 1 MUZ FEO9NA MUZ FE12NA NOTE Turn OFF power supply before disassembling OPERATING PROCEDURE PHOTOS 1 Removing the cabinet Photo 1 1 Remove the screw fixing the service panel See Photo 1 2 Pull down the service panel and remove it See Photo Screws Screw of the 1 of the top cabinet Screws of 3 Remove the screws fixing the conduit cover See the top panel Photo 2 4 Remove the conduit cover See Photo 2 5 Disconnect the power supply wire and indoor outdoor connecting wire 6 Remove the screws fixing the top panel See Photo 1 Screw of 8 Remove the screws fixing the cabinet 9 Remove the cabinet 10 Remove the screws fixing the back panel 11 Remove the back panel Photo 2 7 Remove the top panel See Photo 1 service panel Screw of the conduit cover Screws of Service the cabinet panel Conduit cover 2 Conduit p
39. or Outdoor WB DB Standard temperature 67 95 Maximum temperature 73 Minimum temperature 57 14 Maximum humidity Standard temperature 60 47 Heating Maximum temperature 67 75 Minimum temperature 60 Cooling 4 OUTLINES AND DIMENSIONS MUZ FEO9NA MUZ FE12NA Unit inch REQUIRED SPACE Basically open 4 inch or more without any obstruction in front 15 3 4 Drain hole 61 5 8 and on both sides of the unit e u Air in 7 Air in c 7 X Air out or Morg 2 3 8 x 13 16 Oval hole 7 8 Open two sides of left handle right or rear side 21 5 8 Liquid pipe 1 4 flared Gas pipe 3 8 flared 11 1 32 y 2 5 7 8 3i 11 29 32 6 23 32 siste 19 1716 J 31 1 2 2 23 32 20022 2 RED BLK_ BLK 161 Tn d raw na mcm 2 ur ae ORN PERDRE RE BLK Es aK BK P l1 1 EP 2 I Es 2 _8 HH 0865 rA 1 1 WOPTIN PARTS I SS ap
40. r of compres Sor Refer to 10 5 How to check in verter compressor Check stop valve Outdoor thermistors Discharge temperature thermistor fin temperature thermistor defrost thermistor outdoor heat exchanger temperature ther mistor P C board temperature thermistor or ambient tempera ture thermistor shorts or opens during compressor running Refer to 10 5 Check of outdoor thermistors Outdoor control sys tem Nonvolatile memory data cannot be read properly POWER lamp of the indoor unit lights up or flashes 7 times Replace inverter P C board 6 time flash 2 5 seconds OFF Serial signal The communication fails between the indoor and outdoor unit for 3 minutes Refer to 10 5 How to check miswiring and serial signal error 11 time flash 2 5 seconds OFF Stop valve Closed valve Closed valve is detected by compressor current Check stop valve 14 time flash 2 5 seconds OFF Outdoor unit Other abnormality Outdoor unit is defective Refer to 10 2 2 Flow chart of the detailed outdoor unit failure mode recall function Outdoor unit stops and restarts 3 min utes later is repeated 2 time flash 2 5 seconds OFF Overcurrent protec tion Large current flows into intelligent power module X When overcurrent protection occurs within 10 seconds after compressor starts compressor restarts after 15 seconds Reconnect connector of compres Sor
41. rational frequency of compressor Th operational frequency of compressor The operational frequency of compressor The operational frequency of compressor 7 6 HOW TO OPERATE FIXED FREQUENCY OPERATION Test run operation Press EMERGENCY OPERATION switch to start COOL 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 58 Hz in HEAT mode Indoor fan operates at High speed After 30 minutes test run operation finishes and EMERGENCY OPERATION starts operation frequency of compressor var ies To cancel test run operation EMERGENCY OPERATION press EMERGENCY OPERATION switch or any button on remote controller aRWN 12 8 ACTUATOR CONTROL MUZ FEO9NA MUZ FE12NA 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 OFF ON Outdoor fan motor OFF 8 2 R V COIL CONTROL OFF Heating eres ee ee ON Cooling dr de glue deat hn OFF Dry eee rice dace OFF NOTE The 4 way valve reverses for 5 seconds right before start up of the compressor COOL HEAT 5 seconds 5 seconds ON M Compres
42. sor mes R V coil OFF Outdoor fan ON L S VENE dx OFF motor 8 3 RELATION BETWEEN MAIN SENSOR AND ACTUATOR Actuator Sensor Purpose Outdoor RV coil Indoor fan Compressor fan motor motor Discharge temperature thermistor Protection Cooling Coil frost prevention Heating High pressure protection Cooling High pressure protection Heating Defrosting Q Indoor coil temperature thermistor Defrost thermistor Fin temperature thermistor Protection Outdoor heat exchanger temperature thermistor High pressure protection Ambient temperature thermistor Low ambient temperature operation 13 9 SERVICE FUNCTIONS MUZ FEO9VA MUZ FE12VA 9 1 CHANGE IN DEFROST SETTING Changing defrost finish temperature JS To change the defrost finish temperature cut solder the JS wire of the outdoor inverter P C board Refer to 10 6 1 Jumper Defrost finish temperature Soldered o o Initial setting 41 F 5 C Cab 50 F 10 C 9 2 PRE HEAT CONTROL SETTING PRE HEAT CONTROL When moisture gets into the refrigerant cycle it may interfere the start up of the compressor at low outside tempera ture The pre heat control prevents this interference The pre heat control turns ON when outside temperature is 68 F 20 C or below When pre heat control is turned ON compressor is energized About 50 W lt J
43. t Welded parts of 4 way valve s MITSUBISHI ELECTRIC CORPORATION HEAD OFFICE TOKYO BLDG 2 7 3 MARUNOUCHI CHIYODA KU TOKYO 100 8310 JAPAN Copyright 2009 MITSUBISHI ELECTRIC CO LTD Distributed in Jul 2009 No OBH543 5 New publication effective Jul 2009 Made in Japan Specifications subject to change without notice
44. time flash 2 5 seconds OFF DC voltage 8 time flash 2 5 seconds OFF DC voltage of inverter cannot be detected normally Each phase current of compressor 9 time flash 2 5 seconds OFF Each phase current of compressor cannot be detected normally Refer to 10 5 5 How to check inverter compressor 12 time flash 2 5 seconds OFF Overcurrent Compressor open phase 10 time flash 2 5 seconds OFF Large current flows into intelligent power module IPM The open phase operation of compressor is detected The interphase short out occurs in the output of the intelligent power module IPM The compressor winding shorts out Reconnect compressor connector Refer to 10 5 How to check inverter compressor 14 time flash 2 5 seconds OFF Stop valve Closed valve 14 time flash 2 5 seconds OFF Closed valve is detected by compressor current Check stop valve NOTE Blinking patterns of this mode differ from the ones of Troubleshooting check table 10 3 17 10 3 TROUBLESHOOTING CHECK TABLE Symptom LED indication Abnormal point Condition Condition Remedy Outdoor unit does not oper ate 1 time flash every 2 5 seconds Outdoor power sys tem Overcurrent protection stop is continuously performed 3 times within 1 minute after the compressor gets started or failure of restart of compressor has repeated 24 times Reconnect connecto

SERVICE MANUAL

Contents

Download Pdf Manuals

Related Search

Related Contents