SERVICE MANUAL OUTDOOR UNIT MUZ-GA25VA - MUZ-GA25VA - MUZ-GA25VA - MUZ-GA25VA - MUZ-GA35VA - MUZ-GA35VA - MUZ-GA25VA(H)- MUZ-GA25VAH E4 MUZ-GA25VAH -

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1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS Revision:C MUZ-A5VA(H)- Please void OB79 REVISED EDITION-B. E4 has been added. OUTDOOR UNIT SERVICE MANUAL HFC utilized R40A. OB79 REVISED EDITION-C Wireless type Models E MUZ-A5VA - E MUZ-A5VA - E MUZ-A5VA - E4 MUZ-A5VA - E MUZ-A5VA - E MUZ-A5VA - E MUZ-A5VAH - E MUZ-A5VAH E MUZ-A5VAH E4 MUZ-A5VAH - E MUZ-A5VAH - MUZ-A5VAH - E Indoor unit service manual MSZ-A VA Series (OB78) MSZ-CB VA Series (OB44) CONTENTS. TECHNICAL CHANES 4. PART NAMES AND FUNCTIONS 8. SPECIFICATION 9 4. NOISE CRITERIA CURVES 5. OUTLINES AND DIMENSIONS 6. WIRIN DIARAM 7. REFRIERANT SYSTEM DIARAM 9 8. PERFORMANCE CURVES 9. ACTUATOR CONTROL 9 0. SERVICE FUNCTIONS 0. TROUBLESHOOTIN 0. DISASSEMBLY INSTRUCTIONS 5. PARTS LIST RoHS PARTS LIST 58 NOTE: RoHS compliant products have <> mark on the spec name plate. For servicing of RoHS compliant products, refer to the RoHS Parts List.

2 Revision:A Alternative inverter P.C.board has been added(refer to -7.. Inverter P.C.board (Alternative)). FUSE F90 has been equipped to MUZ-A5. Model 6. Wiring diagram -6.N Check of inverter P.C.board MUZ-A5VA MUZ-A5VAH change change MUZ-A5VA MUZ-A5VAH Change Change E model has been added. Quick clean kit has been removed. Revision:B MUZ-A5VA(H)- E has been added. -. Failure mode recall function has been changed. RoHS PARTS LIST has been added. Revision:C MUZ-A5VA(H)- E4 has been added. Solenoid valve coil has been removed. (MUZ-A5VA- E :Serial. 605T~, MUZ-A5VAH- E :Serial T~)

3 TECHNICAL CHANES MUZ-A09YV - E MUZ-A5VA - E MUZ-A09YVH - MUZ-A5VAH - E.Indication of capacity has been changed.(btu base kw base).control method between indoor and outdoor unit has been changed..power supply method has been changed (change to supply from outdoor unit). 4.Terminal block for power supply has been added. 5.Power P.C. board has been changed. 6.Inverter P.C. board has been changed. 7.Refrigerant circuit has been changed. Compressor has been changed.(knb07fbvh KNB065FDTH) LEV has been removed and capillary tube has been added. Bypass circuit for low outside temperature operation has been added. Specification and position of muffler have been changed. Path of outdoor heat exchanger has been changed. 4-way valve and R.V. coil have been changed. Stop valve has been changed. 8.Fan motor has been changed. (AC) 9.Shape of grille has been changed. 0.Shape of service panel has been changed..shape of propeller has been changed..quick Clean Kit has been added..symbol on terminal block has been changed (to S/S/S). MUZ-AYV - E MUZ-A5VA - E MUZ-AYVH - MUZ-A5VAH - E.Indication of capacity has been changed.(btu base kw base).control method between indoor and outdoor unit has been changed..power supply method has been changed (change to supply from outdoor unit). 4.Terminal block for power supply has been added. 5.Power P.C. board has been changed. 6.Inverter P.C. board has been changed. 7.Refrigerant circuit has been changed. Compressor has been changed.(knb09faah KNB07FDVH) Specification and position of muffler have been changed. Path of outdoor heat exchanger has been changed. 4-way valve and R.V. coil have been changed. Stop valve has been changed. 8.Fan motor has been changed.(ac DC) 9.Shape of grille has been changed. 0.Shape of service panel has been changed..shape of propeller has been changed..quick Clean Kit has been added..symbol on terminal block has been changed (to S/S/S). MUZ-A5VA - E MUZ-A5VA - E MUZ-A5VAH - E MUZ-A5VAH - E MUZ-A5VA - E MUZ-A5VA - E MUZ-A5VAH - MUZ-A5VAH - E.Quick clean kit has been removed. MUZ-A5VA - E MUZ-A5VA - E MUZ-A5VAH - MUZ-A5VAH - E.Capillary tube for heating has been added..solenoid valve coil has been removed.(a5va- E :Serial. 605T~, A5VAH- E :Serial T~) MUZ-A5VA - E MUZ-A5VA - E4 MUZ-A5VAH - MUZ-A5VAH - E4.Refrigerant circuit has been changed..solenoid valve coil has been removed.

4 INFORMATION FOR THE AIR CONDITIONER WITH R40A REFRIERANT This room air conditioner adopts HFC refrigerant (R40A) which never destroys the ozone layer. Pay particular attention to the following points, though the basic installation procedure is same as that for R air conditioners. As R40A has working pressure approximate.6 times as high as that of R, 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 R40A refrigerant during storage and installation, since it is more susceptible to contaminations than R. For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R40A. (Refer to. Refrigerant piping.) 4 Composition change may occur in R40A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent composition change. Refrigeration Refrigerant oil New refrigerant Refrigerant R40A Composition (Ratio) HFC-: HFC-5 (50%:50%) Refrigerant handling Pseudo-azeotropic refrigerant Chlorine t included Safety group (ASHRAE) A/A Molecular weight 7.6 Boiling point (:) -5.4 Steam pressure [5:](Mpa).557 Saturated steam density [5:](Kg/K) 64 Combustibility n combustible ODP w 0 WP w 70 Refrigerant charge method From liquid phase in cylinder Additional charge on leakage Possible Kind Incompatible oil Color n Smell n w :Ozone Destruction Parameter : based on CFC- w :lobal Warmth Parameter : based on CO Previous refrigerant R R (00%) Single refrigerant Included A n combustible as phase Possible Compatible oil Light yellow n Compressor New Specification Current Specification The incompatible refrigeration oil easily separates from refrigerant and is in the upper layer inside the suction muffler. Raising position of the oil back hole enables to back the Since refrigerant and refrigeration oil are compatible each, refrigeration oil goes back to the compressor through the lower position oil back hole. refrigeration oil of the upper layer to flow back to the compressor. Suction muffler Suction muffler Compressor Oil back hole Refrigeration oil Compressor Oil back hole Refrigerant Refrigeration oil /Refrigerant NOTE : The unit of pressure has been changed to MPa on the international system of units(si unit system). The conversion factor is: (MPa [auge]) =0.(kgf/f [auge]) 4

5 Conversion chart of refrigerant temperature and pressure (MPa [auge]) R40A Saturated liquid pressure R NOTE : The unit of pressure has been changed to MPa on the international system of units(si unit system). The conversion factor is: (MPa [auge]) =0.(kgf/f [auge]) (:).Tools dedicated for the air conditioner with R40A refrigerant The following tools are required for R40A refrigerant. Some R tools can be substituted for R40A tools. The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other refrigerant being charged into the unit. Cap size has been changed from 7/6 UNF with 0 threads to / UNF with 0 threads. R40A tools Can R tools be used? Description R40A has high pressures beyond the measurement range of existing auge manifold gauges. Port diameters have been changed to prevent any other refrigerant from being charged into the unit. Charge hose as leak detector Hose material and cap size have been changed to improve the pressure resistance. Dedicated for HFC refrigerant. Torque wrench 6.5 mm and 9.5 mm.7 mm Flare tool Flare gauge New Clamp bar hole has been enlarged to reinforce the spring strength in the tool. Provided for flaring work (to be used with R flare tool). Vacuum pump Provided to prevent the back flow of oil. This adapter enables you to use New adapter vacuum pumps. Electronic scale for It is difficult to measure R40A with a charging cylinder because the New refrigerant charging refrigerant bubbles due to high pressure and high-speed vaporization : t Substitutable for R40A : Substitutable for R40A.Refrigerant piping Specifications Use the refrigerant pipes that meet the following specifications. Pipe For liquid For gas Outside diameter mm Wall thickness 0.8 mm 0.8 mm 0.8 mm Insulation material Heat resisting foam plastic Specific gravity Thickness 8 mm Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a thickness less than 0.8mm, as the pressure resistance is insufficient. 5

6 Flaring work and flare nut Flaring work for R40A pipe differs from that for R pipe. For details of flaring work, refer to Installation manual FLARIN WORK. Pipe diameter mm Dimension of flare nut R40A 7 6 R 7 4.Refrigerant oil Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces. 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 refrigeration 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 Liquid pipe as pipe Service port Stop valve Outdoor unit auge manifold valve (for R40A) Charge hose (for R40A) Refrigerant gas cylinder for R40A with siphon Refrigerant (liquid) Electronic scale for refrigerant charging 6

7 PART NAMES AND FUNCTIONS MUZ-A5VA MUZ-A5VA MUZ-A5VAH MUZ-A5VAH Air inlet (back and side) Piping Drain hose Air outlet Drain outlet ACCESSORIES MUZ-A5VA - E MUZ-A5VA - E MUZ-A5VAH - E MUZ-A5VAH - E MUZ-A5VA - E MUZ-A5VA - E MUZ-A5VA - E4 MUZ-A5VA - E MUZ-A5VAH - E MUZ-A5VAH - E MUZ-A5VAH - E4 MUZ-A5VAH - E Drain socket Quick clean kit 7

8 SPECIFICATION Outdoor model MUZ-A5VA MUZ-A5VAH MUZ-A5VA MUZ-A5VAH Capacity Electrical data Function Power supply Capacity Rated frequency(min.-max.) Dehumidification Air flow Power outlet Running current Power input Power factor Starting current Compressor motor current Fan motor current Coefficient of performance(c.o.p) Model Output Winding resistance(at 0:) Model Compressor Fan motor Special remarks Winding resistance(at 0:) Dimensions WOHOD Weight Sound level Fan speed(high/low, High/Med./Low) Fan speed regulator Refrigerant filling capacity(r40a) Refrigeration oil (Model) kw r/h K /h A A W % A A A W " " mm kg db(a) rpm kg cc Cooling Single phase 0V,50Hz.5 (0.9-.0). ( ).4, KNB065FDTH 500 U-V.88 U-W.88 V-W.88 RA6V-AB WHT-BLK 47 BLK-RED 8 800o550o Heating 0 (NEO) Cooling Single phase 0V,50Hz.5 (.0-.9).0, , NOTE : Test conditions are based on ISO 55 Cooling : Indoor Dry-bulb temperature 7:Wet-bulb temperature 9: Outdoor Dry-bulb temperature 5:Wet-bulb temperature(4:) Heating : Indoor Dry-bulb temperature 0:Wet-bulb temperature 5: Outdoor Dry-bulb temperature 7: Wet-bulb temperature 6: Refrigerant piping length (one way): 5m Measured under rated operating frequency KNB07FDVH 550 U-V.5 U-W.5 V-W.5 RC0J50-AL WHT-BLK 7.5 BLK-RED 7.5 RED-WHT o550o / /80/ Heating 4.0 ( ), , (NEO) 8

9 Specifications and rating conditions of main electric parts Model Item MUZ-A5VA MUZ-A5VAH MUZ-A5VA MUZ-A5VAH Current transformer Current transformer (CT) (CT76, CT78) ETA9Z59BZ ETQ9Z7AY Smoothing capacitor (C6A, C6B, C6C) V Diode module Fuse Fuse (DB6, DB65) (F6) (F7, F80) D5XB60 50V 0A 50V.5A Fuse ( F90 w) 50V.5A Defrost heater Intelligent power module (H) (IPM) 0V 0W PS44-A-0 0V 0W Expansion valve coil (LEV) CAM-MDME VDC Reactor Current-detecting resistor Current-detecting resistor (L6) (R6) (R8) 0A.0mH 45m" 5W ( element) 5m" 5W Current-limiting resistor (R64A, R64B) 0" 5W Terminal block Relay Relay (TB,TB) (X6) (X64) P 5NB-a 4A-A-PS Relay (X66) 5NB-a 5NB-a Relay R.V. coil Solid state relay Solenoid valve coil (X69) (S4) (SR6) (R) 5NB-a(for E / E / E ) SHF-4-0W5 MC-0PL FQ-08-RK (for E / E / E w) STF-0AJ50 Heater protector (6H) Open 45: Open 45: Outdoor fan motor thermal fuse Open 5: w Refer to Revision A. w MUZ-A5VA- E (Serial. ~6050T) MUZ-A5VAH- E (Serial. ~ T) 9

10 4 NOISE CRITERIA CURVES MUZ-A5VA MUZ-A5VAH MUZ-A5VA MUZ-A5VAH FUNCTION SPL(dB(A)) LINE COOLIN 46 HEATIN 46 FAN SPEED High Med. FUNCTION SPL(dB(A)) LINE COOLIN 47 HEATIN 48 Test conditions Cooling : Dry-bulb temperature 5: Wet-bulb temperature (4:) Heating : Dry-bulb temperature 7: Wet-bulb temperature 6: 90 OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR APPROXIMATE THRESHOLD OF HEARIN FOR CONTINUOUS NOISE BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-40 NC-0 NC-0 Test conditions Cooling : Dry-bulb temperature 5: Wet-bulb temperature (4:) Heating : Dry-bulb temperature 7: Wet-bulb temperature 6: 90 OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR APPROXIMATE THRESHOLD OF HEARIN FOR CONTINUOUS NOISE BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-40 NC-0 NC-0 OUTDOORUNIT m MICROPHONE 0

11 5 OUTLINES AND DIMENSIONS MUZ-A5VA MUZ-A5VA MUZ-A5VAH MUZ-A5VAH Unit: mm 400 Air in Drain hole [4 (MUZ-A5/A5VA) Drain hole [ (MUZ-A5/A5VAH) REQUIRED SPACE 00mm or more Basically open 00mm or more without any obstruction in front and on both sides of the unit. 00mm or more Air in Bolt pitch for installation 04~5 00mm or more 50mm or more. holes 0X Air out Service panel Open two sides of left, right, or rear side. Handle 550 Liquid refrigerant pipe joint Refrigerant pipe (flared) [ Service port as refrigerant pipe joint Refrigerant pipe (flared) [ Bolt pitch for installation 800

12 6 WIRIN DIARAM MUZ-A5VA- MUZ-A5VA- MUZ-A5VA- E E E (Serial. ~6050T) BLK L6 TAB6 BLK BLK R64A F6 TAB6 WHT L6 L6 0V~ R64B TB WHT BLU RED S U U DB6 CT76 P W BLK WHT RED CN6 LD-U LD-V S V TAB6 X64 MC RED F80 N C6C C6A C6B LD70 LD-W S -4V W R6 T80 BLK CT 4 V CT78 IPM BLU NR6 NR64 TO INDOOR UNIT CONNECTIN WHT LD69 CN7 X6 F7 TB CIRCUIT BREAKER DSA6 L IC80 TB800 S4 TR8 CN77 C65 SR6 RN N MF LDE ~/N 0V 50Hz RN/YLW INVERTER P.C. BOARD R8 DB65 CN9 X69 PE POWER SUPPLY LDY R CN64 CN64 CN64 4 CN60 POWER P.C. BOARD 5 4 CN77 CN76 CN RN RT65 RT6 RT6 RT64 WHITE BLU RED NOTE:. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring). Symbols below indicate. /: Terminal block, : Connector NAME CURRENT-DETECTIN RESISTOR CURRENT-LIMITIN RESISTOR SOLID STATE RELAY TERMINAL BLOCK SWITCHIN POWER TRANSISTOR TRANSFORMER RELAY R.V. COIL SOLENOID VALVE COIL SYMBOL SYMBOL L6 L6,L6 MC MF NR6,NR64 RT6 RT6 RT64 RT65 NAME SYMBOL R6,R8 CURRENT TRANSFORMER CT,CT76,CT78 R64A,R64B C6A,C6B,C6C SR6 TB,TB TR8 T80 X6,X64,X69 S4 R NAME REACTOR CMC COIL COMPRESSOR OUTDOOR FAN MOTOR(INNER FUSE) VARISTOR DEFROST THERMISTOR DISCHARE TEMPERATURE THERMISTOR FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR SMOOTHIN CAPACITOR OUTDOOR FAN CAPACITOR DIODE MODULE SURE ABSORBER FUSE (T0AL50V) FUSE (T.5AL50V) INTELLIENT POWER DEVICE INTELLIENT POWER MODULE C65 DB6,DB65 DSA6 F6 F7,F80 IC80 IPM

13 MUZ-A5VA- E MUZ-A5VA- E4 (Serial. 605T~)

14 MUZ-A5VAH- E MUZ-A5VAH- E (Serial. ~ T) MUZ-A5VAH- E L6 BLK BLK BLK TAB6 R64A F6 TAB6 WHT TB WHT BLU RED S 0V~ U BLK WHT LD-U LD-V U DB6 L6 L R64B W CT76 P S RED RED V F80 MC C6C LD-W N C6B C6A LD70 X64 TAB6 S -4V CN6 CT 4 NR64 NR6 TO INDOOR UNIT CONNECTIN W V WHT IPM CT78 R6 T80 BLK BLU LD69 TB800 X6 CN7 F7 TB CIRCUIT BREAKER L S4 IC80 DSA6 TR8 CN77 N SR6 C65 RN ~/N 0V 50Hz MF LDE RN/YLW INVERTER P.C. BOARD DB65 R8 X69 PE CN9 POWER P.C. BOARD POWER SUPPLY LDY R CN7 X66 RED CN60 CN64 CN64 CN BLK BLK BLK BLK CN75 CN77 CN76 YLW 4 6 H 6H BLK BLK RN BLK RT65 RT6 RT6 RT64 RED BLU WHITE NOTE:. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring). Symbols below indicate. /: Terminal block, : Connector NAME CURRENT-LIMITIN RESISTOR SOLID STATE RELAY TERMINAL BLOCK SWITCHIN POWER TRANSISTOR TRANSFORMER RELAY R.V. COIL SOLENOID VALVE COIL HEATER PROTECTOR SYMBOL R64A,R64B SR6 TB,TB TR8 T80 X6,X64,X66,X69 S4 R 6H NAME REACTOR CMC COIL COMPRESSOR OUTDOOR FAN MOTOR(INNER FUSE) VARISTOR DEFROST THERMISTOR DISCHARE TEMPERATURE THERMISTOR FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR CURRENT-DETECTIN RESISTOR SYMBOL L6 L6,L6 MC MF NR6,NR64 RT6 RT6 RT64 RT65 R6,R8 NAME SYMBOL CURRENT TRANSFORMER CT,CT76,CT78 SMOOTHIN CAPACITOR OUTDOOR FAN CAPACITOR DIODE MODULE SURE ABSORBER FUSE (T0AL50V) FUSE (T.5AL50V) DEFROST HEATER INTELLIENT POWER DEVICE INTELLIENT POWER MODULE C6A,C6B,C6C C65 DB6,DB65 DSA6 F6 F7,F80 H IC80 IPM 4

15 MUZ-A5VAH- E MUZ-A5VAH- E4 (Serial T~) 5

16 MUZ-A5VA ~/N 0V 50Hz 0V~ CIRCUIT BREAKER POWER SUPPLY -4V S S S L N TB WHT TB PE BLU RED RN/YLW F6 WHT TAB6 TAB6 NR64 NR6 R64B TAB6 R64A TO INDOOR UNIT CONNECTIN LDE L6 DSA6 L6 CT X64 X6 CN7 BLK S4 6 L6 BLK LD70 LD69 TB800 DB6 DB65 R8 C6A C6B C6C F80 R6 T80 IC80 INVERTER P.C. BOARD P N U V W CT76 IPM CT78 CN74 LD-U LD-V LD-W 6 BLK WHT RED RED LEV CN6 W BLK MC WHT U V RN BLK RN F7 4 BLU TR8 WHITE BLU RED POWER P.C. BOARD 4 CN LDY CN9 CN MF CN64 CN64 CN64 4 RT65 RT6 RT6 RT64 SYMBOL CT,CT76,CT78 C6A,C6B,C6C DB6,DB65 DSA6 F6 F7,F80 IC80 IPM LEV NAME CURRENT TRANSFORMER SMOOTHIN CAPACITOR DIODE MODULE SURE ABSORBER FUSE (T0AL50V) FUSE (T.5AL50V) INTELLIENT POWER DEVICE INTELLIENT POWER MODULE EXPANSION VALVE COIL SYMBOL L6 L6,L6 MC MF NR6,NR64 RT6 RT6 RT64 RT65 NAME REACTOR CMC COIL COMPRESSOR OUTDOOR FAN MOTOR VARISTOR DEFROST THERMISTOR DISCHARE TEMPERATURE THERMISTOR FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR SYMBOL R6,R8 R64A,R64B TB,TB TR8 T80 X6,X64 S4 NAME CURRENT-DETECTIN RESISTOR CURRENT-LIMITIN RESISTOR TERMINAL BLOCK SWITCHIN POWER TRANSISTOR TRANSFORMER RELAY R.V. COIL NOTE:. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring). Symbols below indicate. /: Terminal block, : Connector C N7 7 C N7 6 C N7 5 6

17 MUZ-A5VAH TAB6 R64A F6 TAB6 WHT TB S 0V~ R64B WHT BLU RED C N7 7 S C N7 6 S C N7 5 L6 BLK BLK BLK U BLK WHT LD-U LD-V U DB6 L6 L6 CT76 P W RED RED V F80 MC C6C LD-W N C6B C6A LD70 X64 TAB6-4V CN6 CT 4 NR64 NR6 TO INDOOR UNIT CONNECTIN W V WHT IPM CT78 R6 T80 BLK BLU LD69 TB800 TB CIRCUIT BREAKER CN74 X6 L LEV 6 F7 IC80 S4 DSA6 TR8 RN N CN7 ~/N 0V 50Hz LDE RN/YLW 6 POWER P.C. BOARD R8 INVERTER P.C. BOARD CN7 LDY X66 4 DB65 PE POWER SUPPLY 7 RED CN64 CN64 CN64 4 CN9 CN9 4 5 CN BLK BLK BLK BLK YLW H 6H 4 5 BLK BLK BLK RT65 RT6 RT6 RT64 RN BLU WHITE RED MF NOTE:. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring). Symbols below indicate. /: Terminal block, : Connector NAME CURRENT-LIMITIN RESISTOR TERMINAL BLOCK SWITCHIN POWER TRANSISTOR TRANSFORMER RELAY R.V. COIL HEATER PROTECTOR SYMBOL R64A,R64B TB,TB TR8 T80 X6,X64,X66 S4 6H NAME REACTOR CMC COIL COMPRESSOR OUTDOOR FAN MOTOR VARISTOR DEFROST THERMISTOR DISCHARE TEMPERATURE THERMISTOR FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR CURRENT-DETECTIN RESISTOR SYMBOL L6 L6,L6 MC MF NR6,NR64 RT6 RT6 RT64 RT65 R6,R8 NAME SYMBOL CURRENT TRANSFORMER CT,CT76,CT78 SMOOTHIN CAPACITOR DIODE MODULE SURE ABSORBER FUSE (T0AL50V) FUSE (T.5AL50V) DEFROST HEATER INTELLIENT POWER DEVICE INTELLIENT POWER MODULE EXPANSION VALVE COIL C6A,C6B,C6C DB6,DB65 DSA6 F6 F7,F80 H IC80 IPM LEV

18 BLK SYMBOL CT,CT76,CT78 C6A,C6B,C6C DB6,DB65 DSA6 F6 F7,F80,F90 IC80 IPM,IC9 LEV SYMBOL L6 L6,L6 MC MF NR6,NR64 RT6 RT6 RT64 RT65 SYMBOL R6,R8 R64A,R64B TB,TB TR8 T80 X6,X64 S4 NAME CURRENT TRANSFORMER SMOOTHIN CAPACITOR DIODE MODULE SURE ABSORBER FUSE (T0AL50V) FUSE (T.5AL50V) INTELLIENT POWER DEVICE INTELLIENT POWER MODULE EXPANSION VALVE COIL NAME REACTOR CMC COIL COMPRESSOR OUTDOOR FAN MOTOR VARISTOR DEFROST THERMISTOR DISCHARE TEMPERATURE THERMISTOR FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR F90 IC9 CN9 4 5 CN9 CN64 CN64 4 CN RN F6 TAB6 RT6 RT6 RT64 TAB6 RT65 NOTE:. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring). Symbols below indicate. /: Terminal block, : Connector NAME CURRENT-DETECTIN RESISTOR CURRENT-LIMITIN RESISTOR TERMINAL BLOCK SWITCHIN POWER TRANSISTOR TRANSFORMER RELAY R.V. COIL LDE CT 4 NR6 BLU U C N7 C N7 6 W C N7 4 TB800 CN60 45 POWER P.C. BOARD INVERTER P.C. BOARD F7 X6 DSA6 S4 CN7 BLK WHT LD-U LD-V U DB6 NR64 CT76 P RED RED V F80 C6C CN6 LD-W N C6B C6A LD70 RN W L6 TAB6 BLK BLK L6 L6 R64B R64A V CT78 WHT IPM R6 C N7 IC X MUZ-A5VA walternative inverter P.C. board T80 LD69 TR8 R8 DB65 LDY BLK 0V~ -4V CIRCUIT BREAKER S S S L TB TB WHT BLU RED WHT TO INDOOR UNIT CONNECTIN ~/N 0V 50Hz POWER SUPPLY N PE RN/YLW MC WHITE BLU RED LEV MF 8

19 MUZ-A5VAH walternative inverter P.C. board TAB6 R64A F6 TAB6 WHT TB S 0V~ R64B WHT BLU RED S S C N7 7 CT 4 C N7 6 C N7 5 L6 BLK BLK BLK U BLK WHT LD-U LD-V U DB6 L6 L6 CT76 P W RED RED V F80 MC C6C LD-W N C6B C6A LD70 X64 TAB6-4V CN6 NR64 NR6 TO INDOOR UNIT CONNECTIN W V WHT IPM CT78 R6 BLK T80 BLU LD69 TB800 TB CIRCUIT BREAKER 6 LEV 4 C N7 X6 F7 L F90 IC80 S4 DSA6 TR8 RN N CN7 ~/N 0V 50Hz LDE RN/YLW IC9 INVERTER P.C. BOARD 6 R8 DB65 POWER P.C. BOARD PE POWER SUPPLY LDY CN7 4 X66 RED CN9 CN64 CN64 CN64 CN CN BLK BLK BLK BLK YLW H 6H 4 5 BLK BLK BLK MF RT65 RT6 RT6 RT64 RN BLU WHITE RED NOTE:. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring). Symbols below indicate. /: Terminal block, : Connector NAME CURRENT-LIMITIN RESISTOR TERMINAL BLOCK SWITCHIN POWER TRANSISTOR TRANSFORMER RELAY R.V. COIL HEATER PROTECTOR SYMBOL R64A,R64B TB,TB TR8 T80 X6,X64,X66 S4 6H NAME REACTOR CMC COIL COMPRESSOR OUTDOOR FAN MOTOR VARISTOR DEFROST THERMISTOR DISCHARE TEMPERATURE THERMISTOR FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR CURRENT-DETECTIN RESISTOR SYMBOL L6 L6,L6 MC MF NR6,NR64 RT6 RT6 RT64 RT65 R6,R8 NAME SYMBOL CURRENT TRANSFORMER CT,CT76,CT78 SMOOTHIN CAPACITOR DIODE MODULE SURE ABSORBER FUSE (T0AL50V) FUSE (T.5AL50V) DEFROST HEATER INTELLIENT POWER DEVICE INTELLIENT POWER MODULE EXPANSION VALVE COIL C6A,C6B,C6C DB6,DB65 DSA6 F6 F7,F80,F90 H IC80 IPM,IC9 LEV 9

20 7 REFRIERANT SYSTEM DIARAM MUZ-A5VA - E MUZ-A5VA - E MUZ-A5VAH - MUZ-A5VAH - E Unit:mm Refrigerant pipe [9.5 (with heat insulator) Muffler 4-way valve Flared connection Stop valve (with service port) Discharge temperature thermistor RT6 Muffler Compressor Defrost thermistor RT6 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Refrigerant pipe [6.5 (with heat insulator) Stop valve (with strainar) Capillary tube [.0 [ Check valve Solenoid valve Capillary tube [.0 [ Strainer #00 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating MUZ-A5VA - E MUZ-A5VAH - E Unit:mm Refrigerant pipe [9.5 (with heat insulator) Muffler 4-way valve Flared connection Stop valve (with service port) Discharge temperature thermistor RT6 Muffler Compressor Defrost thermistor RT6 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Refrigerant pipe [6.5 (with heat insulator) Capillary tube [.0 [ Stop valve (with strainar) Check valve Solenoid valve Capillary tube [.0 [ Capillary tube [.0 [ Check valve Strainer #00 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating 0

21 MUZ-A5VA - E4 MUZ-A5VAH - E4 Unit:mm Refrigerant pipe [9.5 (with heat insulator) Muffler 4-way valve Flared connection Stop valve (with service port) Discharge temperature thermistor RT6 Muffler Compressor Defrost thermistor RT6 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Refrigerant pipe [6.5 (with heat insulator) Stop valve (with strainar) Capillary tube [.0 [ Capillary tube [.0 [ Check valve Strainer #00 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating MUZ-A5VA MUZ-A5VAH Refrigerant pipe [9.5 (with heat insulator) Muffler 4-way valve Unit:mm Flared connection Stop valve (with service port) Discharge temperature thermistor RT6 Muffler Compressor Defrost thermistor RT6 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Refrigerant pipe [6.5 (with heat insulator) Capillary tube [.0 [.0 40 Stop valve (with strainar) Expansion valve Muffler Strainer #00 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating

22 MAX. REFRIERANT PIPIN LENTH and MAX. HEIHT DIFFERENCE Model MUZ-A5VA MUZ-A5VAH MUZ-A5VA MUZ-A5VAH Refrigerant piping : m Max. length Max. Height difference A B 0 Piping size O.D : mm as Liquid Indoor unit Max. Height difference B Max. length A Outdoor unit ADDITIONAL REFRIERANT CHARE (R40A:g) Model MUZ-A5VA MUZ-A5VAH MUZ-A5VA MUZ-A5VAH Outdoor unit precharged m 0 6m 0 7m 0 Refrigerant piping length (one way) 8m 9m 0m m m m 90 Calculation : Xg=0g/m (Refrigerant piping length (m) 5) NOTE: Refrigerant piping exceeding 7m requires additional refrigerant charge according to the calculation m 70 5m 00 0m 450

23 8 PERFORMANCE CURVES MUZ-A5VA MUZ-A5VA MUZ-A5VAH MUZ-A5VAH The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions. Since operating conditions vary according to the areas where these units are installed, the following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve. () UARANTEED VOLTAE 98 ~ 64V, 50Hz () AIR FLOW Air flow should be set at MAX. () MAIN READINS () Indoor intake air wet-bulb temperature : C WB () Indoor outlet air wet-bulb temperature : C WB () Outdoor intake air dry-bulb temperature : C DB (4) Total input: W (5) Indoor intake air dry-bulb temperature : C DB (6) Outdoor intake air wet-bulb temperature : C WB (7) Total input : W Indoor air wet/dry-bulb temperature difference on the left side of the following chart shows the difference between the indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service. } } Cooling Heating How to measure the indoor air wet-bulb / dry-bulb temperature difference. Attach at least sets of wet and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least sets of wet and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high.. Attach at least sets of wet and dry-bulb thermometers to the outdoor air intake. Cover the thermometers to prevent direct rays of the sun.. Check that the air filter is cleaned. 4. Open windows and doors of room. 5. Press the EMERENCY OPERATION switch once (twice) to start the EMERENCY COOL (HEAT) MODE. 6. When system stabilizes after more than 5 minutes, measure temperature and take an average temperature minutes later, measure temperature again and check that the temperature does not change. INDOOR UNIT OUTDOOR UNIT Wet and dry-bulb thermometers Wet and dry-bulb thermometers 8-. Capacity and input curves Indoor air Wet-bulb temperature difference (degree) Indoor intake air Wet-bulb temperature (:) Indoor intake air Wet-bulb temperature (:) MUZ-A5VA MUZ-A5VAH Rated frequency 65Hz MUZ-A5VA MUZ-A5VAH Rated frequency 88Hz Outdoor intake air Dry-bulb temperature (:) Outdoor intake air Dry-bulb temperature (:)

24 Indoor air Dry-bulb temperature difference (degree) Indoor intake air Dry-bulb temperature (:) Indoor intake air Dry-bulb temperature (:) MUZ-A5VA MUZ-A5VAH Rated frequency 85Hz MUZ-A5VA MUZ-A5VAH Rated frequency 96Hz Outdoor intake air Wet-bulb temperature (:) Outdoor intake air Wet-bulb temperature (:) NOTE:The above broken lines are for the heating operation without any frost and defrost operation. Capacity correction factors 8-. Capacity and input correction by operational frequency of compressor MUZ-A5VA MUZ-A5VAH Correction of Cooling capacity Input correction factors MUZ-A5VA MUZ-A5VAH Correction of Cooling total input Capacity correction factors MUZ-A5VA MUZ-A5VAH Correction of Heating capacity Correction of Heating total input (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor Input correction factors MUZ-A5VA MUZ-A5VAH MUZ-A5VA MUZ-A5VAH MUZ-A5VA MUZ-A5VAH MUZ-A5VA MUZ-A5VAH MUZ-A5VA MUZ-A5VAH Correction of Cooling capacity.5 Correction of Cooling total input.5 Correction of Heating capacity.0 Correction of Heating total input.0 Capacity correction factors Input correction factors Capacity correction factors (Hz) (Hz) (Hz) (Hz) The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor The operational frequency of compressor Input correction factors Test run operation (How to operate fixed-frequency operation). Press EMERENCY OPERATION switch to COOL or HEAT mode (COOL : Press once, HEAT : Press twice).. Test run operation starts and continues to operate for 0 minutes.. Compressor operates at rated frequency in COOL mode or 58Hz in HEAT mode. 4. Indoor fan operates at High speed. 5. After 0 minutes, test run operation finishes and EMERENCY OPERATION starts (Operation frequency of compressor varies). 6. To cancel test run operation (EMERENCY OPERATION), press EMERENCY OPERATION switch or any button on remote controller. 4

25 8-4. Outdoor low pressure and outdoor unit current COOL operation Both indoor and outdoor unit are under the same temperature/humidity condition. Operation : TEST RUN OPERATION (refer to 8-.) Dry-bulb temperature(:) Relative humidity(%) (kgf/f [auge]) (MPa [auge]) 4.4 MUZ-A5VA MUZ-A5VAH (kgf/f [auge]) (MPa [auge]) 4.4 MUZ-A5VA MUZ-A5VAH Outdoor low pressure. 65Hz ( C) (%) Ambient temperature( C) Ambient humidity(%) Outdoor low pressure Hz ( C) (%) Ambient temperature( C) Ambient humidity(%) 4 MUZ-A5VA MUZ-A5VAH 6 MUZ-A5VA MUZ-A5VAH Outdoor unit current(a) Hz Outdoor unit current(a) Hz ( C) (%) Ambient temperature( C) Ambient humidity(%) ( C) (%) Ambient temperature( C) Ambient humidity(%) HEAT operation Condition : Dry bulb temperature ( C) Wet bulb temperature ( C) Indoor Outdoor Operation : Test run operation (refer to 8-.).0 MUZ-A5VA MUZ-A5VAH 4.0 MUZ-A5VA MUZ-A5VAH Outdoor unit current (A) Hz Outdoor unit current (A) Hz (:) Ambient temperature( C) (:) Ambient temperature( C) 5

26 PERFORMANCE DATA COOL operation Rated frequency 65Hz MUZ-A5VA MUZ-A5VAH CAPACITY:.5(kW) SHF:0.79 INPUT:640(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature 6

27 PERFORMANCE DATA COOL operation Rated frequency 65Hz MUZ-A5VA MUZ-A5VAH CAPACITY:.5(kW) SHF:0.79 INPUT:640(W) OUTDOOR DB(:) INDOOR INDOOR DB (:) WB (:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature 7

28 PERFORMANCE DATA COOL operation Rated frequency 88Hz MUZ-A5VA MUZ-A5VAH CAPACITY:.5(kW) SHF:0.76 INPUT:080(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature 8

29 PERFORMANCE DATA COOL operation Rated frequency 88Hz MUZ-A5VA MUZ-A5VAH CAPACITY:.5(kW) SHF:0.76 INPUT:080(W) OUTDOOR DB(:) INDOOR INDOOR DB (:) WB (:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature 9

30 PERFORMANCE DATA HEAT operation MUZ-A5VA MUZ-A5VAH Rated frequency 85Hz CAPACITY:.(kW) INPUT:760(W) OUTDOOR WB(:) INDOOR DB(:) Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT MUZ-A5VA MUZ-A5VAH Rated frequency 96Hz CAPACITY:4.0(kW) INPUT:055(W) OUTDOOR WB(:) INDOOR DB(:) Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT NOTE Q:Total capacity (kw) INPUT:Total power input (W) DB : Dry-bulb temperature WB : Wet-bulb temperature 0

31 9 ACTUATOR CONTROL MUZ-A5VA MUZ-A5VA MUZ-A5VAH MUZ-A5VAH 9-. 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 5 seconds after the compressor has stopped running. Compressor Outdoor fan motor ON OFF ON OFF 5 seconds 5 seconds 9-. R.V. coil control Heating ON Cooling OFF Dry OFF NOTE: The 4-way valve reverses for 5 seconds right before start-up of the compressor. <COOL> <HEAT> 5 seconds 5 seconds ON Compressor OFF R.V.coil ON OFF ON or OFF ON or OFF Outdoor fan ON motor OFF 9-. Relation between main sensor and actuator Sensor Discharge temperature thermistor Indoor coil temperature thermistor Defrost thermistor Fin temperature thermistor Ambient temperature thermistor Purpose Compressor Protection Cooling : Coil frost prevention Heating : High pressure protection Cooling : High pressure protection Heating : Defrosting Protection Cooling : Low ambient temperature operation Heating : Defrosting (Heater) Actuator LEV Outdoor fan motor R.V. coil w w w w w w Indoor fan motor Defrost heater Solenoid valve w MUZ-A5VA MUZ-A5VAH w MUZ-A5VA- E / E / E (Serial. ~6050T) MUZ-A5VAH- E / E / E (Serial. ~ T) w

32 0 SERVICE FUNCTIONS MUZ-A5VA MUZ-A5VA MUZ-A5VAH MUZ-A5VAH CHANE IN DEFROST SETTIN <JS> When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to -7-.) JS Jumper wire soldered (Initial setting) none (cut) MUZ-A5VA 5: 8: Defrost finish temperature MUZ-A5VAH MUZ-A5VA 8: 5: 5: 8: MUZ-A5VAH 8: 5: TROUBLESHOOTIN MUZ-A5VA MUZ-A5VA MUZ-A5VAH MUZ-A5VAH -. Cautions on troubleshooting. Before troubleshooting, check the following: ) Check the power supply voltage. ) Check the indoor/outdoor connecting wire for mis-wiring.. Take care of the following during servicing ) 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. ) 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. ) 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. Lead wiring Housing point. Troubleshooting procedure ) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is flashing on and off before starting service work. ) Before servicing check that the connector and terminal are connected properly. ) 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 -., -. and -4.

33 -. 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 (-4.) 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.. Flow chart of failure mode recall function for the indoor/outdoor unit 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. <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 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. W Does the left lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? Blinks: Either indoor or outdoor unit is abnormal. Beep is emitted at the same timing as the blinking of the left lamp of OPERATION INDICATOR lamp. W Judgment of indoor/outdoor abnormality (Blinks) Before blinking, does the left lamp of OPERATION INDICATOR lamp stay ON for seconds? Stays ON for seconds (without beep): The outdoor unit is abnormal. (OFF) W. Regardless of normal or abnormal condition, a short beep is emitted once the signal is received. Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnormalities that can't be recalled with this way. Confirm if outdoor unit is abnormal according to the detailed outdoor unit failure mode recall function.(refer to -.) The indoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the indoor unit failure mode table (Refer to indoor unit service manual.) Make sure to check at least two consecutive blinking cycles. W The outdoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to -.). Make sure to check at least two consecutive blinking cycles. W Releasing the failure mode recall function Release the failure mode recall function by the following procedures. Turn OFF the power supply and turn it ON again. Press RESET button of the remote controller. Repair the defective parts. Deleting the memorized abnormal condition After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" 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 EMERENCY OPERATION switch so that the memorized abnormal condition is deleted. 4Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above. te.make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly..if the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. W. Blinking pattern when the indoor unit is abnormal:.5-second OFF Blinking at 0.5- second interval.5-second OFF Blinking at 0.5- second interval ON OFF Beeps Repeated cycle Beeps Repeated cycle Beeps Repeated cycle W.Blinking pattern when the outdoor unit is abnormal: Blinking at second OFF -second ON second interval.5-second OFF -second ON Blinking at 0.5- second interval ON OFF beep Repeated cycle Beeps beep Repeated cycle Beeps Repeated cycle

34 . 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. With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 5:. W W. Regardless of normal or abnormal condition, short beeps are emitted as the signal is received. Does left lamp of OPERATION INDICATOR 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 the left lamp of OPERATION INDICATOR lamp. W (Blinks) (OFF) The outdoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to -..). Make sure to check at least two consecutive blinking cycles. W 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. Press RESET button of the remote controller. Release the failure mode recall function according to the left mentioned procedure. Repair the defective parts. Deleting the memorized abnormal condition After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" 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 EMERENCY OPERATION switch so that the memorized abnormal condition is deleted. 4Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above. te. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly.. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. W.Blinking pattern when outdoor unit is abnormal:.5-second OFF -second ON Blinking at 0.5- second interval.5-second OFF -second ON Blinking at 0.5- second interval ON OFF beep Repeated cycle Beeps beep Repeated cycle Beeps Repeated cycle 4

35 . Outdoor unit failure mode table NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (-4.). POWER lamp (Indoor unit) OFF -time flash.5 seconds OFF -time flash.5 seconds OFF 4-time flash.5 seconds OFF 5-time flash.5 seconds OFF 6-time flash.5 seconds OFF 7-time flash.5 seconds OFF 8-time flash.5 seconds OFF 9-time flash.5 seconds OFF 0-time flash.5 seconds OFF -time flash.5 seconds OFF -time flash.5 seconds OFF 4-time flash.5 seconds OFF Abnormal point (Failure mode / protection) ne (rmal) Outdoor power system Discharge temperature thermistor Defrost thermistor Fin temperature thermistor P.C. board temperature thermistor Ambient temperature thermistor Overcurrent Compressor synchronous abnormality ( Compressor start-up failure protection) Discharge temperature High pressure Fin temperature/ P.C. board temperature Outdoor fan motor nvolatile memory data Discharge temperature DC voltage Each phase current of compressor Overcurrent Compressor open-phase Outdoor unit (Other abnormality) LED indication (Outdoor P.C. board) -time flash every.5 seconds -time flash.5 seconds OFF 4-time flash.5 seconds OFF -time flash.5 seconds OFF -time flash.5 seconds OFF -time flash.5 seconds OFF 7-time flash.5 seconds OFF 5-time flash.5 seconds OFF 8-time flash.5 seconds OFF 9-time flash.5 seconds OFF 0-time flash.5 seconds OFF Condition Correspondence When it consecutively occurs times that the compressor stops for overcurrent protection within minute after stat-up. When thermistor shorts or opens during compressor running. Reconnect connectors. Refer to -6.A"How to check inverter/ compressor". Check stop valve. Refer to -6."Check of outdoor thermistors". Defective outdoor thermistors can be identified by checking the blinking pattern of LED. When 4A(MUZ-A5VA,MUZ-A5VAH)/ 4A (MUZ-A5VA,MUZ-A5VAH) current flow into intelligent power module. When waveform of compressor current is distorted. When temperature of discharge temperature thermistor exceeds 6:, compressor stops. Compressor can restart if discharge temperature thermistor reads 00: or less minutes later. Reconnect compressor connector. Refer to -6.A"How to check inverter/ compressor". Check stop valve. Reconnect compressor connector. Refer to -6.A"How to check inverter/ compressor". Check refrigerant circuit and refrigerant amount. Refer to -6.L"Check of LEV". When temperature of indoor coil thermistor exceeds 70: in HEAT mode. When defrost thermistor exceeds 70: in COOL mode. When temperature of fin temperature thermistor on the inverter P.C. board exceeds 8 :(MUZ-A5VA, MUZ-A5VAH)/ 8:(MUZ-A5VA,MUZ-A5VAH), or temperature of P.C. board temperature thermistor on the inverter P.C. board exceeds 8:(MUZ-A5VA, MUZ-A5VAH)/ 85:(MUZ-A5VA,MUZ-A5VAH). When outdoor fan has stopped times in a row within 0 seconds after outdoor fan start-up. When nonvolatile memory data cannot be read properly. Check refrigerant circuit and refrigerant amount. Check stop valve. Check around outdoor unit. Check outdoor unit air passage. Refer to -6.I"Check of outdoor fan motor". Refer to -6.I"Check of outdoor fan motor. Refer to -6.N"Check of inverter P.C. board". Replace the inverter P.C. board. When temperature of discharge temperature thermistor has been 50: or less for 0 minutes. When DC voltage of inverter cannot be detected normally. When each phase current of compressor cannot be detected normally. When 4A(MUZ-A5VA,MUZ-A5VAH)/ 4A (MUZ-A5VA,MUZ-A5VAH) 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. When the inverter P.C. board is defective. Refer to -6.L"Check of LEV". Check refrigerant circuit and refrigerant amount. Refer to -6.A"How to check inverter/ compressor". Reconnect compressor connector. Refer to -6. A"How to check inverter/ compressor". Replace the inverter P.C. board. Indoor/outdoor unit failure mode recall function Outdoor unit failure mode recall function 5

36 -. Instruction of troubleshooting Start If blinking of OPERATION INDICATOR lamp cannot be checked, it can be checked with failure mode recall function. Indoor unit operates. Outdoor unit doesn't operate. Indoor unit operates. Outdoor unit doesn't operate normally. Indoor unit doesn't receive the signal from remote controller. OPERATION INDICATOR lamp on the indoor unit is flashing on and off. Outdoor unit operates only in Test Run operation. (Refer to 8-.) Outdoor unit doesn't operate even in Test Run operation. (Refer to 8-.) Unit doesn't operate normal operation in COOL or HEAT mode. Indoor unit operates, when EMERENCY OPERATION switch is pressed. Indoor unit doesn't operate, when EMERENCY OPERATION switch is pressed. Check room temperature thermistor. Refer to "Test point diagram and voltage". Refer to -6.A "How to check inverter/ compressor". Refer to -6.H "Check of R.V. coil". Refer to "Check of remote controller and receiver P.C. board".. Check indoor / outdoor connecting wire. (Check if the power is supplied to the indoor unit.). Refer to "Check of indoor electronic control P.C. board and indoor fan motor". Refer to indoor unit service manual. (MUZ-A5/5) All lamps Flash on and off at 0.5-second intervals Cause: Indoor unit The horizontal vane is not installed correctly. Left lamp Flash on and off at 0.5-second intervals Cause: Indoor/ Outdoor unit Mis-wiring or trouble of serial signal. Left lamp -time flash Cause: Indoor unit Trouble of room temperature/ indoor coil thermistor Left lamp -time flash Cause: Indoor unit Trouble of indoor fan motor Left lamp 4-time flash Cause: Indoor unit Trouble of indoor unit control system Left lamp 5-time flash Cause: Outdoor unit Outdoor power system abnormality Left lamp 6-time flash Cause: Outdoor unit Trouble of thermistor in outdoor unit Left lamp 7-time flash Cause: Outdoor unit Trouble of outdoor control system Left lamp 4-time flash Cause: Outdoor unit Other abnormality Refer to "Check of installation of the horizontal vane". Refer to -6.O "How to check of mis-wiring and serial signal error. Check room temperature thermistor and indoor coil thermistor. Refer to "Test point diagram and voltage". Refer to "Check of indoor fan motor". Replace the indoor electronic control P.C. board. Refer to -6.A "How to check inverter/ compressor". Refer to -6. "Check of outdoor thermistors". Replace inverter P.C. board or outdoor control electronic control P.C. board. Check -.. "Flow chart of the detailed outdoor unit failure mode recall function." 6

37 -4. Troubleshooting check table NOTE. The location of LED is illustrated at the right figure. Refer to LED is lighted during normal operation. Inverter P.C. board (Parts side) Flashing LED. Symptom LED indication Abnormal point/ Condition Condition Correspondence Outdoor unit does not operate -time flash every.5 seconds Outdoor power system Outdoor thermistors Outdoor control system When it consecutively occurs times that the compressor stops for overcurrent protection within minute after start-up. When discharge temperature thermistor, fin temperature thermistor, defrost thermistor, P.C. board temperature thermistor or ambient temperature thermistor shorts or opens during compressor running. When nonvolatile memory data cannot be read properly. (When POWER lamp of the indoor unit lights up or flashes 7-time.) Check stop valve. Reconnect connector of compressor. Refer to -6.A "How to check inverter/ compressor". Refer to -6. "Check of outdoor thermistors". Replace inverter P.C. board 'Outdoor unit stops and restarts minutes later' is repeated 6-time flash.5 seconds OFF 4-time flash.5 seconds OFF -time flash.5 seconds OFF -time flash.5 seconds OFF Serial signal Outdoor unit (Other abnormality) Overcurrent protection Discharge temperature overheat protection When the communication fails between the indoor and outdoor unit for minutes. When outdoor unit is defective. When 4A(MUZ-A5VA,MUZ-A5VAH)/ 4A(MUZ-A5VA, MUZ-A5VAH) current flows into intelligent power module. When temperature of discharge temperature thermistor exceeds 6:, compressor stops. Compressor can restart if discharge temperature thermistor reads 00: or less minutes later. Refer to -6.O "How to check miswiring and serial signal error. Refer to -.. Flow chart of the detailed outdoor unit failure mode recall function. Check stop valve. Reconnect connector of compressor. Refer to -6.A "How to check inverter/compressor". Check refrigerant circuit and refrigerant amount. Refer to -6.L "Check of LEV" time flash.5 seconds OFF 5-time flash.5 seconds OFF Fin temperature /P.C. board temperature thermistor overheat protection High pressure protection 8-time flash.5 seconds OFF Compressor synchronous abnormality When temperature of fin temperature thermistor on the heat sink exceeds 8:(MUZ-A5VA,MUZ-A5VAH)/ 8: (MUZ-A5VA,MUZ-A5VAH) or temperature of P.C. board temperature thermistor on the inverter P.C.board exceeds 8:(MUZ-A5VA,MUZ-A5VAH)/ 85:(MUZ-A5VA, MUZ-A5VAH). When indoor coil thermistor exceeds 70: in HEAT mode. When the defrost thermistor exceeds 70: in COOL mode. When the waveform of compressor current is distorted. Check around outdoor unit. Check outdoor unit air passage. Refer to -6.I "Check of outdoor fan motor". Check refrigerant circuit and refrigerant amount. Check stop valve. Reconnect connector of compressor. Refer to -6.A "How to check inverter/compressor". 0-time flash.5 seconds OFF -time flash.5 seconds OFF -time flash.5 seconds OFF Outdoor fan motor Each phase current of compressor When outdoor fan has stopped times in a row within 0 seconds after outdoor fan start-up. When each phase current of compressor cannot be detected normally Refer to -6.I "Check of outdoor fan motor. Refer to -6.N "Check of inverter P.C. board. Refer to -6.A "How to check inverter/compressor". DC voltage When DC voltage of inverter cannot be detected normally. Refer to -6.A "How to check inverter/compressor" Outdoor unit operates -time flash.5 seconds OFF -time flash.5 seconds OFF 4-time flash.5 seconds OFF Frequency drop by current protection Frequency drop by high pressure protection Frequency drop by defrosting in COOL mode Frequency drop by discharge temperature protection When current from power outlet exceeds 5.A(MUZ-A5VA, MUZ-A5VAH)/ 6.A(MUZ-A5VA,MUZ-A5VAH), compressor frequency lowers. When temperature of indoor coil thermistor exceeds 55: in HEAT mode, compressor frequency lowers. When indoor coil thermistor reads 8: or less in COOL mode, compressor frequency lowers. When temperature of discharge temperature thermistor exceeds :, 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. Check refrigerant circuit and refrigerant amount. Refer to -6.L "Check of LEV". Refer to -6. "Check of outdoor thermistors" Outdoor unit operates 7-time flash.5 seconds OFF 8-time flash.5 seconds OFF 9-time flash.5 seconds OFF Low discharge temperature protection PAM protection PAM: Pulse Amplitude Modulation Inverter check mode When temperature of discharge temperature thermistor has been 50: or less for 0 minutes. When the overcurrent flows into IBT(Insulated ate Bipolar transistor : TR8) or when the bus-bar voltage reaches 0V or more, PAM stops and restarts. When the connector of compressor is disconnected, inverter check mode starts. Refer to -6.L "Check of LEV". Check refrigerant circuit and refrigerant amount. This is not malfunction. PAM protection will be activated in the following cases; Instantaneous power voltage drop (Short time power failure) When the power supply voltage is high. Check if the connector of the compressor is correctly connected. Refer to -6.A "How to check inverter/ compressor". The flashing frequency shows the number of times the LED blinks after every.5-second OFF. (Example) When the flashing frequency is. 0.5-second ON 0.5-second ON ON OFF.5-second OFF.5-second OFF 7

38 -5. Trouble criterion of main parts MUZ-A5VA MUZ-A5VA MUZ-A5VAH MUZ-A5VAH Part name Defrost thermistor (RT6) Ambient temperature thermistor (RT65) Discharge temperature thermistor (RT6) Fin temperature thermistor (RT64) Compressor(MC) Measure the resistance with a tester. Check method and criterion Refer to -7. "Test point diagram and voltage",. "Inverter P.C. board", the chart of thermistor. Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. Refer to -7. "Test point diagram and voltage",. "Inverter P.C. board", the chart of thermistor. Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 40 C) U-V U-W V-W MUZ-A5VA MUZ-A5VAH.58 " ~.0" rmal MUZ-A5VA MUZ-A5VAH.8 " ~.66 " Figure WHT RED BLK W V U Outdoor fan motor(mf) INNER FUSE (Only MUZ-A5VA/H) 0 5i 5 : CUT OFF R.V. coil(s4) Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 40 C) rmal Color of the lead wire MUZ-A5VA MUZ-A5VA MUZ-A5VAH MUZ-A5VAH 9 " ~ 74 " 6 " ~ 04 " WHT BLK BLK RED RED WHT " ~ 4 " " ~ 4 " " ~ 4 " Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 40 C) rmal MUZ-A5VA MUZ-A5VAH MUZ-A5VA MUZ-A5VAH.6 k" ~.6 k".0 k" ~.55 k" MUZ-A5VA MUZ-A5VA MUZ-A5VAH MUZ-A5VAH WHT RED BLK W FUSE V U BLK RED WHT Expansion valve coil(lev) MUZ-A5VA MUZ-A5VAH Measure the resistance with a tester. (Part temperature : 0 C ~ 40 C) Color of the lead wire WHT RED RED ORN YLW BRN BRN BLU rmal 8 " ~ 50 " WHT6 RED ORN4 LEV YLW5 BRN BLU Defrost heater(h) Measure the resistance with a tester. (Part temperature -0 C ~ 40 C) rmal " ~ 48 " Solenoid valve coil (R) MUZ-A5VA- E / E / E (Serial. ~6050T) MUZ-A5VAH- E / E / E (Serial. ~ T) Measure the resistance with a tester. (Part temperature -0 C ~ 40 C) rmal,0 " ~,580 " 8

39 -6. Troubleshooting flow When OPERATION INDICATOR lamp flashes 5-time. Outdoor unit does not operate. A How to check inverter/ compressor Disconnect the connector (CN6) between compressor and the intelligent power module (IPM). Check the voltage between terminals. See -6.B Check of open phase. Are the voltages balanced? Check the resistance of the intelligent power module. See -6.C 'Check of intelligent power module'. Check the compressor. See -6.D Check of compressor. Is the resistance infinite? (0~several ") Replace the inverter P.C. board. B Check of open phase Replace the inverter P.C. board and compressor. 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 5V << Operation method>> Start cooling or heating operation by pressing EMERENCY OPERATION switch on the indoor unit. (Test run operation : refer to 8-.) <<Measurement point>> at points BLK (U)-WHT (V) BLK (U)-RED (W) WHT(V)-RED (W) w Measure AC voltage between the lead wires at points. Inverter P.C. board (Parts side) LED Flashing NOTE. Output voltage varies according to power supply voltage.. Measure the voltage by analog type tester.. During this check, LED of inverter P.C. board flashes 9 times. 9-time flash.5-second OFF C Check of intelligent power module Measure the resistance between the terminals on the intelligent power module. <<Measurement point>> at 6 points BLK-WHT, WHT-BLK BLK-RED, RED-BLK WHT-RED, RED-WHT ohmmeter indication " X rmal (infinite) <<Judgement>> Infinite ["] rmal 0~dozens of Abnormal (short) " X Abnormal (0~dozens of ") 9

40 D Check of compressor Refer to -6.E "Check of compressor winding". Is the compressor normal? Replace the compressor. Refer to -6.F "Check of compressor operation time". Does the compressor operate continuously? Is the compressor operation time more than 0 seconds? Replace the compressor. Ok Check the refrigerant circuit. E Check of compressor winding Disconnect the connector (CN6) between the compressor and intelligent power module, and measure the resistance between the compressor terminals. <<Measurement point>> at points BLK-WHT BLK-RED WHT-RED <<Judgement>> Refer to -5. 0["] Abnormal [short] Infinite["] Abnormal [open] w Measure the resistance between the lead wires at points. NOTE. Be sure to zero the ohmmeter before measurement.. Winding resistance for each phase at 0:. Refer to.specification. F Check of compressor operation time Connect the compressor and activate the inverter. Then measure the time until the inverter stops due to over current. <<Operation method>> Start heating or cooling operation by pressing EMERENCY OPERATION switch on the indoor unit. (Test run operation : Refer to 8-.) <<Measurement>> Measure the time from the start of outdoor fan running to the stop of compressor due to over current. <<Judgement>> For reference 0~0 seconds Abnormal (compressor short or poor contact) (compressor lock-out) 0 seconds~5 minutes Abnormal (refrigerant circuit defect) more than 5 minutes rmal 0 second 0 seconds 5 minutes Outdoor fan starts Abnormal (Compressor winding short or layer short) (Compressor connector poor contact) (Compressor lock-out) Abnormal (Refrigerant circuit defect, etc.) rmal 40

41 When OPERATION INDICATOR lamp flashes 6-time. The thermistors in the outdoor unit are abnormal. Check of outdoor thermistors Defrost thermistor RT6 Disconnect the connectors CN64, CN64 and CN64 from the inverter P.C. board. (Check the characteristics of each thermistor.) Measure the resistance between CN64 and. Discharge temperature thermistor RT6 H Measure the resistance between CN64 and 4. Fin temperature thermistor RT64 Measure the resistance between CN64 and. Ambient temperature thermistor RT65 Measure the resistance between CN64 and. Check of R.V. coil Is the resistance of thermistor normal? (Refer to -7..) Replace the thermistor except RT64. In case that RT64 is abnormal, replace the inverter P.C. board, since RT64 is combined with the inverter P.C. board. Reconnect the connectors CN64, CN64 and CN64. Turn ON the power supply and press EMERENCY OPERATION switch. Replace the inverter P.C. board. Does the unit operate 0 minutes or more? OK. (Cause is poor contact.) w First of all, measure the resistance of R.V. coil to check if the coil is defective. Refer to -5. w In case CN7 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 CN7 is connected. Unit operates COOL mode even if it is set to HEAT mode. Disconnect connector (CN6) between the compressor and intelligent power module. Turn ON the power supply and press EMERENCY OPERATION switch twice (HEAT mode). Is there 0V AC between CN7 and on the power P.C.board minutes after the power supply is turned ON? Replace the power P.C. board. Replace the 4-way valve. CN7 Unit operates HEAT mode even if it is set to COOL mode. Power P.C. board (Soldered side) Disconnect connector (CN6) between the compressor and the intelligent power module. Turn ON the power supply and press EMERENCY OPERATION switch once (COOL mode). Is there 0V AC between CN7 and on the power P.C. board minutes after the power supply is turned ON? Replace the power P.C. board. Replace the 4-way valve. 4

42 Outdoor fan motor does not operate. I Check of outdoor fan motor MUZ-A5VA MUZ-A5VAH Check the resistance of fan motor. (Refer to -5.) Is the resistance of fan motor normal? Replace the outdoor fan motor. Disconnect the connector CN77 on the power P.C. board. Disconnect the connector (CN6) between compressor and power transistor module. Turn ON the power supply and press the EMERENCY OPERATION switch. Does the left lamp of OPERATION INDICATOR lamp on the indoor unit light up? minutes after, is there voltage 0V AC between CN77 and on the power P.C. board? Replace the outdoor fan motor. Replace the power P.C. board. 4

43 Outdoor fan motor does not operate. I Check of outdoor fan motor MUZ-A5VA MUZ-A5VAH Is the resistance between each terminal of outdoor fan motor normal? (Refer to -5.) Disconnect CN9 from the inverter P.C. board. Inverter P.C. board (Solder side) CN9 CN9 Turn ON the power supply. ( Fixed to either 5V or 0V DC) Rotate the outdoor fan slowly by hand, and measure the voltage of CN9 (Measurement of feedback output). Between (+) and 5(-) Between (+) and 5(-) Between (+) and 5(-) Does the voltage between each terminal repeat 5V and 0V DC by turns? Does the outdoor fan rotate smoothly? Replace the outdoor fan motor. Check the inverter P.C. board. (Refer to -6. N) Inverter does not operate. J Check of power supply Disconnect the connector (CN6) between compressor and intelligent power module. Turn ON power supply and press EMERENCY OPERATION switch. Rectify indoor/ outdoor connecting wire. Does the left lamp of OPERATION INDICATOR lamp on the indoor unit light up? Is there voltage 0V AC between the indoor terminal block S and S? Replace the indoor electronic control P.C. board. Is there voltage 80V ~ 70V DC between DB6 (+) and DB6 ( ) on the inverter P.C. board? (Refer to -7..) Check the electric parts in main circuit. Dose LED on the inverter P.C. board light up or flash? (Refer to -7..) If light up,ok. If flash, refer to -4. DB6 Replace the inverter P.C. board. 80V~70V DC Inverter P.C. board (Solder side) 4

44 Outdoor unit does not operate at all, or stops immediately due to overcurrent. K Check of current-limiting resistor When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly. Is the resistance of current-limiting resistor (R64A or R64B) on the power P.C. board normal? (rmal resistance : 5' i5%) Turn ON the power supply and press EMERENCY OPERATION switch. Does LED on the inverter P.C. board light up? Replace the power P.C. board or the inverter P.C. board. Replace the power P.C. board. Does the rush current limiting relay(x64) work properly? (rmally it closes second after outdoor unit power ON.) Replace the inverter P.C. board or the compressor. 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. Heating/Cooling does not work sufficiently. L Check of LEV (Expansion valve) 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 except the set temperature in operation display section of the remote controller is displayed after 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. W Expansion valve operates in full-opening direction. W. Regardless of normal or abnormal, a short beep is emitted once as the signal is received. Do you hear the expansion valve "click, click "? Do you feel the expansion valve vibrate on touching it? Ok Is LEV properly fixed to the expansion valve? Properly fix the LEV to the expansion valve. Does the resistance of LEV have the characteristics? (Refer to -5.) Replace the LEV. Measure each voltage between connector pins of CN74 on the inverter P.C. board..pin(-) Pin(+).Pin4(-) Pin(+).Pin5(-) Pin(+) 4.Pin6(-) Pin(+) Is there about ~5V AC between each? NOTE: Measure the voltage by an analog tester. Replace the inverter P.C. board. Replace the expansion valve. NOTE : After check of LEV, do the undermentioned operations.. Turn OFF the power supply and turn ON it again.. Press RESET button on the remote controller. 44

45 Outdoor base gets frozen. M Check of defrost heater <MUZ-A5VAH MUZ-A5VAH> Check the following points before checking electric continuity. ) Does the resistance of ambient temperature thermistor have the characteristics? Refer to -7.. ) Is the resistance of defrost heater normal? Refer to -5. ) Does the heater protector remain conducted (not open)? 4) Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors? In HEAT mode, for more than 5 minutes, let the ambient temperature thermistor continue to read 5: or less, and let the defrost thermistor continue to read -: or less. NOTE: In case both thermistors are more than the above temperature, cool them with cold water etc... CN76 Is there 0V AC between CN7 and on the power P.C. board? Refer to -7.. Is the voltage between CN76 (+)-(-) on the power P.C. board 0V DC? Refer to -7.. Replace the inverter P.C. board. problem of the power P.C. board. Replace the power P.C. board. CN7 6H H 0V AC Outdoor fan motor does not operate, or stops immediately after starting up. N Check of inverter P.C. board MUZ-A5VA MUZ-A5VAH Check the outdoor fan motor. Refer to-6.i. Check the connection of the connectors. (CN9, CN9) of outdoor fan motor. If the connection is poor, make it correct. Inverter P.C.board (Solder side) CN9 CN9 Operate the outdoor unit by starting EMERENCY OPERATION. Check the LED indication on the inverter P.C. board. Does the LED flash 0-time? Check the corresponding parts following LED indication. (Refer to -4.) (0-time flash) Replace the inverter P.C. board. 45

46 Outdoor fan motor does not operate, or stops immediately after starting up. N Check of inverter P.C. board MUZ-A5VA MUZ-A5VAH walternative inverter P.C. board Check the outdoor fan motor. (Refer to-6.i.) Is the fuse (F90) blown on the inverter P.C. board? Check the connection of the connectors. (CN9, CN9) of outdoor fan motor. If the connection is poor, make it correct. Inverter P.C.board (Solder side) CN9 CN9 Operate the outdoor unit by starting EMERENCY OPERATION. Check the LED indication on the inverter P.C. board. Does the LED flash 0-time? Check the corresponding parts following LED indication. (Refer to -4.) (0-time flash) Replace the inverter P.C. board. 46

47 When unit cannot operate neither by the remote controller nor by EMERENCY OPERATION switch. Indoor unit does not operate. When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn t operate. O How to check mis-wiring and serial signal error (when outdoor unit does not work) Turn OFF the power supply. Is there rated voltage in the power supply? Turn ON the power supply. Check the power supply. Is there rated voltage between outdoor terminal block S and S? Check the wiring. Press EMERENCY OPERATION switch once. Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit> Is serial signal error indicated 6 minutes later? Is there any mis-wiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire? Correct them. A Inverter P.C.board (Parts side) LED B Turn OFF the power supply. Check once more if the indoor/outdoor connecting wire is not mis-wiring. Short-circuit outdoor terminal block S and S. W Turn ON the power supply. W. 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. W.Be sure to check this within minutes after turning ON. After minutes, LED blinks 6 times. Even when the inverter P.C.board is normal, LED blinks 6 times after minutes. Blinking A Turn OFF inverter-controlled lighting equipment. Turn OFF the power supply and then turn ON again. Press EMERENCY OPERATION switch. Is serial signal error indicated 6 minutes later? B Reinstall either the unit or the light each other away. Attach a filter on remote control receiving section of the indoor unit. Does the LED on the inverter P.C. board repeat ".6-second-OFF and 0.8-second-ON quick blinking"? W Turn OFF the power supply. Remove the short-circuit between outdoor terminal block S and S. Turn ON the power supply. Is there amplitude of 0 to 0V DC between outdoor terminal block S and S? <Confirmation of serial signal> Is there rated voltage between indoor terminal block S and S? <Confirmation of power voltage> Be sure to release the failure-mode recall function after checking. Refer to indoor unit service manual. Replace the indoor electronic control P.C. board. (Lighted or not lighted) Replace the inverter P.C. board or the outdoor electronic control P.C.board. W W 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? 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? Replace the indoor/outdoor connecting wire. Replace the indoor/outdoor connecting wire. 47

48 When the cool air does not blow out from the indoor unit in Low Outside Temperature Operation, or the condensed water drops from the indoor unit. P Operation check of the solenoid valve. MUZ-A5VA- E / E / E (Serial. ~6050T) MUZ-A5VAH- E / E / E (Serial. ~ T) Set the failure mode recall function.(refer to -.) Do you hear the operation sound (click sound) of the solenoid valve every 5 seconds? The solenoid valve is normal. Correct the connection. Are the connectors for solenoid valve coil firmly connected without disconnection or loose connection? Check the ambient temperature thermistor (RT65) in the outdoor unit. (Refer to -6.) Disconnect CN9 and measure the voltage between CN9 and using tester. Trouble of the solenoid valve or solenoid valve coil. Does it repeat to go 0V and 0VAC at 5 second interval? Replace the solenoid valve. Measure the resistance of solenoid valve coil. Is the resistance normal? (Refer to -5) Are the cords between CN76, CN77 on the outdoor power P.C. board and CN75 on the outdoor inverter P.C. board firmly connected without disconnection or loose connection? Correct the connection. Replace the solenoid valve coil. Measure the voltage between CN75 8(+) and (ND) on the inverter P.C. board. Does it repeat to go 0V and VDC at 5 second interval? Replace the inverter P.C. board. Replace the power P.C. board. 48

49 Q Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the antennas and the indoor unit within m, or is the distance between the antennas and the outdoor unit within m? Extend the distance between the antennas and the indoor unit, and/or the antennas and the outdoor unit. Is the distance between the TV sets or radios and the indoor unit within m, or is the distance between the TV sets or radios and the outdoor unit within m? Extend the distance between the TV sets and/or radios and the indoor unit, or the TV sets or radios and the outdoor unit. Are the antennas damaged? Is the coaxial cable damaged? Is there any poor contact in the antenna wiring? Replace or repair the antenna. Replace or repair the coaxial cable. Is the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas close? Extend the distance between the indoor/outdoor connecting wire of the air conditioner and the wiring 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 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. )Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic noise. )Within 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. )After a short time ( 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. 49

50 -7. Test point diagram and voltage. MUZ-A5VA MUZ-A5VA MUZ-A5VAH MUZ-A5VAH. Inverter P.C. board Back side of unit DB6 80V ~ 70V DC (+) (-) Output to drive compressor (LDV,LDW,LDU) Smoothing capacitor (C6C) FUSE (F80) Smoothing capacitor (C6B) Smoothing capacitor (C6A) (+) (+) (+) 45V 5ND MUZ-A5VA,MUZ-A5VAH Rotational frequency feedback signal of outdoor fan motor (CN9) LED monitor lamp Jumper wire for change in defrost setting (JS) Front side of unit Connecting wire with power P.C. board (CN75) 0V AC DB6 LEV connector (CN74) Defrost thermistor/rt6 (CN64) Discharge temperature thermistor/rt6 (CN64) Ambient temperature thermistor /RT65 (CN64) Fin temperature thermistor/rt64 (CN64) Output to drive outdoor fan motor (CN9) } MUZ-A5VA MUZ-A5VAH Connector for indoor/outdoor communication (CN60) Resistance(k") Fin temperature thermistor(rt64) Temperature(:) Resistance(k") Defrost thermistor(rt6) Ambient temperature thermistor(rt65) Temperature(:) 50 Resistance(k") Discharge temperature thermistor(rt6) Temperature(:)

51 -7. Test point diagram and voltage MUZ-A5VA MUZ-A5VA MUZ-A5VAH MUZ-A5VAH. Inverter P.C. board (Alternative) Back side of unit DB6 80V ~ 70V DC (+) (-) 0V AC DB6 Smoothing capacitor (C6C) Smoothing capacitor (C6B) Smoothing capacitor (C6A) FUSE (F80) FUSE (F90) LED monitor lamp Output to drive compressor (LDW, LDV, LDU) (+) (+) (+) 45V 5ND MUZ-A5VA,MUZ-A5VAH Rotational frequency feedback signal of outdoor fan motor CN9) Jumper wire for change in defrost setting (JS) Front side of unit Connecting wire with power P.C. board (CN75) LEV connector (CN74) Discharge temperature thermistor/rt6 (CN64) Defrost thermistor/rt6 (CN64) Fin temperature thermistor/rt64 (CN64) Ambient temperature thermistor /RT65 (CN64) Output to drive outdoor fan motor (CN9) } MUZ-A5VA MUZ-A5VAH Connector for indoor/ outdoor communication (CN60) Resistance(k") Fin temperature thermistor(rt64) Temperature(:) Resistance(k") Defrost thermistor(rt6) Ambient temperature thermistor(rt65) Temperature(:) 5 Resistance(k") Discharge temperature thermistor(rt6) Temperature(:)

52 MUZ-A5VA MUZ-A5VA MUZ-A5VAH MUZ-A5VAH. Power P.C. board MUZ-A5VA- E / E / E (Serial. ~6050T) Back side of unit MUZ-A5VAH- E / E / E (Serial. ~ T) Solenoid valve coil (CN9) Varistor Varistor 0V AC (NR6) (NR6) Varistor (NR64) Front side of unit 0V AC MUZ-A5VA MUZ-A5VAH Output to drive outdoor Fan motor(cn77) 0V AC R.V.coil(CN7) 0V AC Connecting wire with inverter P.C.board (CN76) FUSE (F7) 0V AC Heater connector (CN7) } MUZ-A5VAH MUZ-A5VAH 5

53 DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types ( Refer to () and ()) 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. () Slide the sleeve and check if there is a locking lever or not. () The terminal with this connector has the locking mechanism. Sleeve Locking lever Slide the sleeve. Pull the terminal while pushing the locking lever. Connector Hold the sleeve, and pull out the terminal slowly. MUZ-A5VA MUZ-A5VAH MUZ-A5VA MUZ-A5VAH OPERATIN PROCEDURE. Removing the cabinet () Remove the screw fixing the service panel. (See Photo.) () Pull down the service panel and remove it. (See Photo.) () Disconnect the power supply and indoor/outdoor connecting wire. (4) Remove the screws fixing the top panel. (See Photo.) (5) Remove the top panel. (See Photo.) (6) Remove the screws fixing the cabinet. (7) Remove the cabinet. (8) Remove the screws fixing the back panel. (9) Remove the back panel. Photo Screws of the top panel Screws of the cabinet PHOTOS Screws of the top panel Photo Back panel Screw of the service panel Direction to remove Screws of the cabinet Service panel Hooks Screws of the cabinet 5

54 OPERATIN PROCEDURE. Removing the inverter assembly, inverter P.C. board and power P.C. board () Remove the top panel, cabinet and service panel. (Refer to.) () Disconnect the power supply and indoor/outdoor connecting wire and remove the back panel. (Refer to.) () Disconnect the ground wires (See Photo.), the lead wire to the reactor and the following connectors; <Power P.C. board> CN7 (4-way valve) CN77 (Fan motor) MUZ-A5VA/A5VAH CN7 (Defrost heater) MUZ-A5/A5VAH CN9 (Solenoid valve coil) MUZ-A5VA- E / E / E (Serial. ~6050T) MUZ-A5VAH- E / E / E (Serial. ~ T) <Inverter P.C. board> CN9,CN9 (Fan motor) MUZ-A5VA/A5VAH CN64 (Defrost thermistor and discharge temperature thermistor) CN64 (Ambient temperature thermistor) CN74 (LEV) MUZ-A5VA/A5VAH (4) Remove the compressor connector (CN6). (5) Remove the screws fixing the relay panel. (See Photo.) (6) Remove the inverter assembly. (See Photo.) (7) Disconnect all connectors and lead wires on the inverter P.C. board. (See Photo 4.) (8) Remove the inverter P.C. board from the inverter assembly. (9) Remove the screw fixing the power P.C. board. (See Photo 4.) (0) Disconnect all connectors and lead wires on the power P.C. board. () Remove the power P.C. board from the inverter assembly. Photo Photo 4 Heat sink PHOTOS Screws of the relay panel Inverter P.C. board Power P.C. board Screws of the ground wires. Removing R.V. coil () Remove the top panel, cabinet and service panel. (Refer to.) () Disconnect the power supply and indoor/outdoor connecting wire and remove the back panel. (Refer to.) () Remove the inverter assembly. (Refer to.) (4) Remove the R.V. coil. (See Photo 5.) 4. Removing the discharge temperature thermistor and defrost thermistor () Remove the top panel, cabinet and service panel. (Refer to.) () Disconnect the power supply and indoor/outdoor connecting wire and remove the back panel. (Refer to.) () Remove the inverter assembly. (Refer to.) (4) Pull out the discharge temperature thermistor from its holder. (See Photo 5.) (5) Pull out the defrost thermistor from its holder. (See Photo 6.) Photo 5 Screw of the power P.C. board R.V. coil 54 Discharge temperature thermistor

55 OPERATIN PROCEDURE PHOTOS 5. Removing outdoor fan motor () Remove the top panel, cabinet and service panel. (Refer to.) () Disconnect the power supply and indoor/outdoor connecting wire and remove the back panel. (Refer to.) () 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. Photo 6 6. Removing the compressor and 4-way valve () Remove the top panel, cabinet and service panel. (Refer to.) () Disconnect the power supply and indoor/outdoor connecting wire and remove the back panel. (Refer to.) () Remove the inverter assembly. (Refer to.) (4) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 kg/cm (0 MPa). (5) Detach the 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.) Photo 7 Defrost thermistor Screws of the outdoor fan motor Propeller Photo 8 Welded parts of 4-way valve 55