Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy MUZ-GA35VAH - E1

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1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SERVICE MANUAL Wireless type Models E MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - MUZ-GA35VAH - E HFC utilized R40A. OB379 Indication of model name MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - E MUZ-GA35VAH - E CONTENTS. TECHNICAL CHANGES. PART NAMES AND FUNCTIONS 6 3. SPECIFICATION 7 4. NOISE CRITERIA CURVES 9 5. OUTLINES AND DIMENSIONS 0 6. WIRING DIAGRAM 7. REFRIGERANT SYSTEM DIAGRAM 5 8. PERFORMANCE CURVES 7 9. ACTUATOR CONTROL 5 0. SERVICE FUNCTIONS 6. TROUBLESHOOTING 6. DISASSEMBLY INSTRUCTIONS PARTS LIST 48 NOTE: This service manual describes technical data of the outdoor units. As for indoor units MSZ-GAVA- E, MSZ-GA5VA- E and MSZ-GA35VA- E, refer to the service manual OB378.

2 TECHNICAL CHANGES MUZ-A09YV - E MUZ-GA5VA - E MUZ-A09YVH - MUZ-GA5VAH - E.Indication of capacity has been changed.(btu base kw base).control method between indoor and outdoor unit has been changed. 3.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.(knb073fbvh 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. 3.Symbol on terminal block has been changed (to S/S/S3). MUZ-AYV - E MUZ-GA35VA - E MUZ-AYVH - MUZ-GA35VAH - E.Indication of capacity has been changed.(btu base kw base).control method between indoor and outdoor unit has been changed. 3.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 KNB073FDVH) 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. 3.Symbol on terminal block has been changed (to S/S/S3).

3 INFORMATION FOR THE AIR CONDITIONER WITH R40A REFRIGERANT 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. 3 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-3: 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 GWP w 730 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 :Global Warmth Parameter : based on CO Previous refrigerant R R (00%) Single refrigerant Included A n combustible Gas 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 [Gauge]) =0.(kgf/f [Gauge]) 3

4 Conversion chart of refrigerant temperature and pressure (MPa [Gauge]) 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 [Gauge]) =0.(kgf/f [Gauge]) (:).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 Gauge manifold Charge hose Gas leak detector Torque wrench Flare tool Flare gauge Vacuum pump adapter Electronic scale for refrigerant charging : t Substitutable for R40A Can R tools be used? New New New Description R40A has high pressures beyond the measurement range of existing gauges. Port diameters have been changed to prevent any other refrigerant from being charged into the unit. Hose material and cap size have been changed to improve the pressure resistance. Dedicated for HFC refrigerant mm and 9.5 mm.7 mm 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). Provided to prevent the back flow of oil. This adapter enables you to use vacuum pumps. It is difficult to measure R40A with a charging cylinder because the refrigerant bubbles due to high pressure and high-speed vaporization : 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. 4

5 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 FLARING WORK. Pipe diameter mm Dimension of flare nut R40A 7 6 R 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 Gas pipe Service port Stop valve Outdoor unit Gauge manifold valve (for R40A) Charge hose (for R40A) Refrigerant gas cylinder for R40A with siphon Refrigerant (liquid) Electronic scale for refrigerant charging 5

6 PART NAMES AND FUNCTIONS MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - E MUZ-GA35VAH - E OUTDOOR UNIT Air inlet (back and side) Piping Drain hose Air outlet Drain outlet ACCESSORIES MUZ-GA5VA - E MUZ-GA35VA - E Drain socket Quick clean kit MUZ-GA5VAH - E MUZ-GA35VAH - E 6

7 3 SPECIFICATION Outdoor model MUZ-GA5VA - E MUZ-GA5VAH - E MUZ-GA35VA - E MUZ-GA35VAH - E Capacity Electrical data Function Power supply Capacity Rated frequency(min.-max.) Dehumidification Air flow Starting current Compressor motor current Fan motor current Coefficient of performance(c.o.p) Compressor Fan motor Special remarks Model Output Winding resistance(at 0:) Model Winding resistance(at 0:) Dimensions WOHOD Weight Sound level Fan speed(highw/loww, HighW/Med.W/LowW) Fan speed regulator Refrigerant filling capacity(r40a) Refrigeration oil (Model) Thermistor RT6(at 0:) Thermistor RT6(at 00:) Thermistor RT64(at 50:) Thermistor RT65(at 5:) kw r/h K /h A A A W " " mm kg db(a) rpm kg cc k" k" k" k" Cooling Single phase 30V,50Hz.5 ( ) 3. ( ).4, KNB065FDTH 500 U-V.88 U-W.88 V-W.88 RA6V-AB WHT-BLK 347 BLK-RED 8 800o550o Heating 30 (NEO) Cooling Heating Single phase 30V,50Hz 3.5 (.0-3.9) 4.0 ( ).0,058, NOTE : Test conditions are based on ISO 55 Cooling : Indoor Dry-bulb temperature 7:Wet-bulb temperature 9: Outdoor Dry-bulb temperature 35: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 w Reference value KNB073FDVH 550 U-V.53 U-W.53 V-W.53 RC0J50-AL WHT-BLK 37.5 BLK-RED 37.5 RED-WHT o550o W/750W 880W/80W/650W (NEO)

8 Specifications and rating conditions of main electric parts OUTDOOR UNIT Model Item Current transformer Current transformer (CT) (CT76, CT78) Smoothing capacitor (C63A, C63B, C63C) Diode module (DB6, DB65) Fuse (F6) Fuse (F7, F80) Defrost heater (H) Intelligent power module (IPM) Expansion valve coil (LEV) Reactor (L6) Current-detecting resistor (R6) Current-detecting resistor (R83) Current-limiting resistor (R64A, R64B) Terminal block (TB,TB) Relay (X63) Relay (X64) Relay (X66) Relay (X69) R.V. coil (S4) Solid state relay (SR6) Solenoid valve coil (R) Heater protector (6H) Outdoor fan motor thermal fuse MUZ-GA5VA - E MUZ-GA5VAH - E MUZ-GA35VA - E MUZ-GA35VAH - E ETA9Z59BZ ETQ9Z7AY V D5XB60 50V 0A 50V 3.5A 30V 30W 30V 30W PS44-A-03 CAM-MDME VDC 0A 3.0mH 45m" 5W ( element) 5m" 5W 0" 5W 3P G5NB-a G4A-A-PS G5NB-a G5NB-a G5NB-a SHF-4-0W5 G3MC-0PL FQ-08-RK Open 45: STF-0AJ503 Open 45: Open 5: 8

9 4 NOISE CRITERIA CURVES MUZ-GA5VA - E MUZ-GA5VAH - E MUZ-GA35VA - E MUZ-GA35VAH - E FUNCTION SPL(dB(A)) LINE COOLING 46 HEATING 46 FAN SPEED High Med. FUNCTION SPL(dB(A)) LINE COOLING 47 HEATING 48 Test conditions, Cooling : Dry-bulb temperature 35: 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 HEARING FOR CONTINUOUS NOISE BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-40 NC-30 NC-0 Test conditions, Cooling : Dry-bulb temperature 35: 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 HEARING FOR CONTINUOUS NOISE BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-40 NC-30 NC-0 OUTDOORUNIT m MICROPHONE 9

10 5 OUTLINES AND DIMENSIONS MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - MUZ-GA35VAH - E Unit: mm OUTDOOR UNIT 400 Air in Drain hole [4 (MUZ-GA5/GA35VA) Drain hole [33 (MUZ-GA5/GA35VAH) 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 304~35 00mm or more 350mm or more.3 holes 0X Air out 40 3 Service panel Handle Open two sides of left, right, or rear side. Liquid refrigerant pipe joint Refrigerant pipe (flared) [ Service port Gas refrigerant pipe joint Refrigerant pipe (flared) [ Bolt pitch for installation 800 0

11 6 WIRING DIAGRAM MUZ-GA5VA - E MODEL WIRING DIAGRAM OUTDOOR UNIT BLK L6 TAB63 BLK BLK F6 TAB6 WHT L6 L63 30V~ R64B TB WHT BLU RED S U U DB6 CT76 P C63A C63B C63C R64A W BLK WHT RED 3 CN6 LD-U LD-V S V MC RED F80 LD70 LD-W N TAB6 X64 NR64 NR63 CT 4 3 F7 X63 S3-4V W CT78 IPM R6 T80 BLK V BLU TO INDDOR UNIT CONNECTING WHT LD69 CN7 TB CIRCUIT BREAKER DSA6 L IC80 TB800 S4 TR8 CN77 C65 SR6 GRN N MF LDE ~/N 30V 50Hz GRN/YLW INVERTER P.C. BOARD R83 DB65 CN93 3 X69 PE POWER SUPPLY LDY R CN643 CN64 CN CN60 POWER P.C. BOARD CN77 CN76 CN GRN 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) 3. Symbols below indicate. /: Terminal block, : Connector NAME CURRENT-DETECTING RESISTOR CURRENT-LIMITING RESISTOR SOLID STATE RELAY TERMINAL BLOCK SWITCHING POWER TRANSISTOR TRANSFORMER RELAY R.V. COIL SOLENOID VALVE COIL SYMBOL R6,R83 R64A,R64B SR6 TB,TB TR8 T80 X63,X64,X69 S4 R NAME REACTOR CMC COIL COMPRESSOR OUTDOOR FAN MOTOR(INNER FUSE) VARISTOR DEFROST THERMISTOR DISCHARGE TEMPERATURE THERMISTOR FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR SYMBOL L6 L6,L63 MC MF NR63,NR64 RT6 RT6 RT64 RT65 NAME CURRENT TRANSFORMER SMOOTHING CAPACITOR OUTDOOR FAN CAPACITOR DIODE MODULE SURGE ABSORBER FUSE (T0AL50V) FUSE (T3.5AL50V) INTELLIGENT POWER DEVICE INTELLIGENT POWER MODULE SYMBOL CT,CT76,CT78 C63A,C63B,C63C C65 DB6,DB65 DSA6 F6 F7,F80 IC80 IPM

12 MUZ-GA5VAH - E OUTDOOR UNIT MODEL WIRING DIAGRAM L6 BLK BLK BLK TAB63 R64B R64A X64 F6 TAB6 WHT TB WHT BLU RED S 30V~ U BLK WHT LD-U LD-V U DB6 L63 L W CT76 P S RED RED CN6 V F80 MC C63C LD-W N C63B C63A LD70 TAB6 S3-4V CT 4 3 NR64 NR63 TO INDDOR UNIT CONNECTING 3 V WHT W IPM CT78 R6 T80 BLK BLU LD69 TB800 X63 CN7 F7 TB CIRCUIT BREAKER L S4 IC80 DSA6 TR8 CN77 N SR6 C65 GRN ~/N 30V 50Hz MF LDE POWER P.C. BOARD GRN/YLW 3 PE POWER SUPPLY R83 LDY CN60 CN643 CN64 CN INVERTER P.C. BOARD DB65 CN93 X69 R CN7 X66 RED BLK BLK BLK BLK CN75 CN77 CN76 YLW 4 6 H 6H 3 BLK BLK GRN 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) 3. Symbols below indicate. /: Terminal block, : Connector NAME CURRENT-LIMITING RESISTOR SOLID STATE RELAY TERMINAL BLOCK SWITCHING POWER TRANSISTOR TRANSFORMER RELAY R.V. COIL SOLENOID VALVE COIL HEATER PROTECTOR SYMBOL R64A,R64B SR6 TB,TB TR8 T80 X63,X64,X66,X69 S4 R 6H NAME REACTOR CMC COIL COMPRESSOR OUTDOOR FAN MOTOR(INNER FUSE) VARISTOR DEFROST THERMISTOR DISCHARGE TEMPERATURE THERMISTOR FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR CURRENT-DETECTING RESISTOR SYMBOL L6 L6,L63 MC MF NR63,NR64 RT6 RT6 RT64 RT65 R6,R83 NAME CURRENT TRANSFORMER SMOOTHING CAPACITOR OUTDOOR FAN CAPACITOR DIODE MODULE SURGE ABSORBER FUSE (T0AL50V) FUSE (T3.5AL50V) DEFROST HEATER INTELLIGENT POWER DEVICE INTELLIGENT POWER MODULE SYMBOL CT,CT76,CT78 C63A,C63B,C63C C65 DB6,DB65 DSA6 F6 F7,F80 H IC80 IPM

13 C N7 7 MUZ-GA35VA - E MODEL WIRING DIAGRAM OUTDOOR UNIT L6 BLK BLK BLK SYMBOL CT,CT76,CT78 C63A,C63B,C63C DB6,DB65 DSA6 F6 F7,F80 IC80 IPM LEV SYMBOL L6 L6,L63 MC MF NR63,NR64 RT6 RT6 RT64 RT65 U SYMBOL R6,R83 R64A,R64B TB,TB TR8 T80 X63,X64 S4 NAME CURRENT TRANSFORMER SMOOTHING CAPACITOR DIODE MODULE SURGE ABSORBER FUSE (T0AL50V) FUSE (T3.5AL50V) INTELLIGENT POWER DEVICE INTELLIGENT POWER MODULE EXPANSION VALVE COIL BLK WHT NOTE:. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring) 3. Symbols below indicate. /: Terminal block, : Connector NAME CURRENT-DETECTING RESISTOR CURRENT-LIMITING RESISTOR TERMINAL BLOCK SWITCHING POWER TRANSISTOR TRANSFORMER RELAY R.V. COIL NAME REACTOR CMC COIL COMPRESSOR OUTDOOR FAN MOTOR VARISTOR DEFROST THERMISTOR DISCHARGE TEMPERATURE THERMISTOR FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR ~/N 30V 50Hz 30V~ CIRCUIT BREAKER POWER SUPPLY L N TB PE LD-U LD-V GRN/YLW U WHITE BLU RED TAB63 R64A S S S3 TB WHT BLU RED DB6 R64B WHT NR63 L63 TO INDDOR UNIT CONNECTING GRN LDE CT76 P W RED RED CN6 V F80 MC LD-W N C63C C63B C63A LD70 X64 3 V WHT W IPM CT78 R6 T80 BLK 3 4 CT CN74 LD69 TB800 X63 LEV 6 IC80 TR8 S4 CN7 INVERTER P.C. BOARD R83 DB CN643 CN64 CN CN93 CN CN F6 GRN TAB6 POWER P.C. BOARD RT65 RT6 RT6 RT64 MF NR64 DSA6 LDY TAB6 L6 F7 C N7 5 C N7 6 BLU -4V 3

14 C N7 7 C N7 5 C N7 6 MUZ-GA35VAH - E OUTDOOR UNIT MODEL WIRING DIAGRAM BLK L6 F6 TAB6 TAB63 BLK BLK WHT WHT L6 L63 DB6 U R64B R64A P LD-U BLU CT76 LD-V F80 TAB6 V RED X64 LD70 C63A C63B C63C N W LD-W CT 4 3 R6 NR64 NR63 BLU T80 IPM CT78 F7 LD69 X63 CN74 DSA6 TB800 IC80 S4 GRN TR8 CN7 GRN/YLW LDE 6 DB65 POWER P.C. BOARD R83 INVERTER P.C. BOARD CN7 LDY BLK BLK RED X66 4 BLK BLK CN60 CN93 CN93 CN643 CN64 CN64 YLW TB S 30V~ U W BLK WHT MC RED RED CN6 S S3-4V TO INDDOR UNIT CONNECTING 3 BLK V WHT TB CIRCUIT BREAKER L LEV 6 N ~/N 30V 50Hz PE POWER SUPPLY 4 H 6H BLK BLK BLK RT65 RT6 RT6 RT64 GRN 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) 3. Symbols below indicate. /: Terminal block, : Connector NAME CURRENT-LIMITING RESISTOR TERMINAL BLOCK SWITCHING POWER TRANSISTOR TRANSFORMER RELAY R.V. COIL HEATER PROTECTOR SYMBOL R64A,R64B TB,TB TR8 T80 X63,X64,X66 S4 6H NAME REACTOR CMC COIL COMPRESSOR OUTDOOR FAN MOTOR VARISTOR DEFROST THERMISTOR DISCHARGE TEMPERATURE THERMISTOR FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR CURRENT-DETECTING RESISTOR SYMBOL L6 L6,L63 MC MF NR63,NR64 RT6 RT6 RT64 RT65 R6,R83 NAME CURRENT TRANSFORMER SMOOTHING CAPACITOR DIODE MODULE SURGE ABSORBER FUSE (T0AL50V) FUSE (T3.5AL50V) DEFROST HEATER INTELLIGENT POWER DEVICE INTELLIGENT POWER MODULE EXPANSION VALVE COIL SYMBOL CT,CT76,CT78 C63A,C63B,C63C DB6,DB65 DSA6 F6 F7,F80 H IC80 IPM LEV

15 7 REFRIGERANT SYSTEM DIAGRAM MUZ-GA5VA - E MUZ-GA5VAH - E OUTDOOR UNIT Unit:mm Refrigerant pipe [9.5 (with heat insulator) Muffler 4-way valve Flared connection Stop valve (with service port) Discharge temperatuer thermistor RT6 Muffler Compressor Defrost thermistor RT6 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Refrigerant pipe [6.35 (with heat insulator) Stop valve (with strainar) Capillary tube [3.0 [ Check valve Solenoid valve Capillary tube [3.0 [ Strainer #00 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating MUZ-GA35VA - E MUZ-GA35VAH - E OUTDOOR UNIT Refrigerant pipe [9.5 (with heat insulator) Muffler 4-way valve Unit:mm Flared connection Stop valve (with service port) Discharge temperatuer thermistor RT6 Muffler Compressor Defrost thermistor RT6 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Refrigerant pipe [6.35 (with heat insulator) Capillary tube [3.0 [.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 5

16 MAX. REFRIGERANT PIPING LENGTH Model Refrigerant piping Max. length : m A Piping size O.D : mm Gas Liquid Length of connecting pipe : m Indoor unit Outdoor unit MUZ-GA5VA - E MUZ-GA5VAH - E MUZ-GA35VA - E MUZ-GA35VAH - E Gas 0.43 Liquid 0.5 MAX. HEIGHT DIFFERENCE Indoor unit w Max. Height difference m Refrigerant Piping Max. length A Outdoor unit w Height difference should be within m regardless of which unit, indoor or outdoor position is high. ADDITIONAL REFRIGERANT CHARGE (R40A:g) Model Outdoor unit precharged 5m 6m 7m 8m Refrigerant piping length (one way) 9m 0m m m 3m 4m 5m 0m MUZ-GA5VA - E MUZ-GA5VAH - E MUZ-GA35VA - E MUZ-GA35VAH - E Calculation : Xg=30g/mo(Refrigerant piping length(m) - 5) 6

17 8 PERFORMANCE CURVES MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - MUZ-GA35VAH - E 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. () GUARANTEED VOLTAGE 07 ~ 53V, 50Hz () AIR FLOW Air flow should be set at MAX. (3) MAIN READINGS () Indoor intake air wet-bulb temperature : C WB () Indoor outlet air wet-bulb temperature : C WB (3) 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 chart on next page 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. 3. Check that the air filter is cleaned. 4. Open windows and doors of room. 5. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY 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 Indoor air Wet-bulb temperature difference (degree) Indoor intake air Wet-bulb temperature (:) Indoor intake air Wet-bulb temperature (:) MSZ-GA5VA - E MUZ-GA5VA - E MUZ-GA5VAH - E Rated frequency 65Hz MSZ-GA35VA - E MUZ-GA35VA - E MUZ-GA35VAH - E Rated frequency 88Hz Outdoor intake air Dry-bulb temperature (:) Outdoor intake air Dry-bulb temperature (:) 7

18 Indoor air Dry-bulb temperature difference (degree) Indoor intake air Dry-bulb temperature (:) Indoor intake air Dry-bulb temperature (:) MSZ-GA5VA - E MUZ-GA5VA - E MUZ-GA5VAH - E Rated frequency 85Hz MSZ-GA35VA - E MUZ-GA35VA - E MUZ-GA35VAH - E Rated frequency 96Hz Outdoor intake air Wet-bulb temperature (:) Outdoor intake air Wet-bulb temperature (:) NOTE:The above curves are for the heating operation without any frost. Capacity correction factors MUZ-GA5VA - E MUZ-GA5VAH - E Correction of Cooling capacity Input correction factors MUZ-GA5VA - E MUZ-GA5VAH - E Correction of Cooling total input Capacity correction factors MUZ-GA5VA - E MUZ-GA5VAH - E 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-GA5VA - E MUZ-GA5VAH - E MUZ-GA35VA - MUZ-GA35VAH - E E MUZ-GA35VA - E MUZ-GA35VAH - E MUZ-GA35VA - E MUZ-GA35VAH - E MUZ-GA35VA - E MUZ-GA35VAH - E 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 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT <How to operate fixed-frequency operation (Test run operation)>. Press EMERGENCY OPERATION switch to COOL or HEAT mode (COOL : Press once, HEAT : Press twice).. Test run operation starts and continues to operate for 30 minutes. 3. Compressor operates at rated frequency in COOL mode or 58Hz in HEAT mode. 4. Indoor fan operates at High speed. 5. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts (Operation frequency of compressor varies). 6. To cancel test run operation (EMERGENCY OPERATION), press EMERGENCY OPERATION switch or any button on remote controller. NOTE : The unit of pressure has been changed to MPa on the international system of units (SI unit system). The conversion factor is: (MPa [Gauge]) =0.(kgf/f [Gauge]) 8

19 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Both indoor and outdoor unit are under the same temperature/humidity condition. Air flow : High speed 3 Operational frequency : 65Hz(MUZ-GA5VA, MUZ-GA5VAH) 88Hz(MUZ-GA35VA, MUZ-GA35VAH) Dry-bulb temperature Relative humidity(%) (kgf/f [Gauge]) (MPa [Gauge]) 4.4 MUZ-GA5VA - MUZ-GA5VAH - E E (kgf/f [Gauge]) (MPa [Gauge]) 4.4 MUZ-GA35VA - MUZ-GA35VAH - E E Outdoor low pressure. 65Hz ( C) (%) Ambient temperature( C) Ambient humidity(%) Outdoor low pressure Hz ( C) (%) Ambient temperature( C) Ambient humidity(%) 4 MUZ-GA5VA - E MUZ-GA5VAH - E 6 MUZ-GA35VA - E MUZ-GA35VAH - E 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 indoor: Dry bulb temperature 0.0 C Wet bulb temperature 4.5 C Condition outdoor: Dry bulb temperature,7,5,0.0 C Wet bulb temperature,6,,4.5 C Outdoor unit current (A) MUZ-GA5VA - E MUZ-GA5VAH - E 58Hz Outdoor unit current (A) MUZ-GA35VA - E MUZ-GA35VAH - E 58Hz (:) Ambient temperature( C) (:) Ambient temperature( C) 9

20 PERFORMANCE DATA COOL operation Rated frequency 65Hz MSZ-GA5VA - E : MUZ-GA5VA - E MUZ-GA5VAH - E 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 0

21 PERFORMANCE DATA COOL operation Rated frequency 65Hz MSZ-GA5VA - E : MUZ-GA5VA - E MUZ-GA5VAH - E 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

22 PERFORMANCE DATA COOL operation Rated frequency 88Hz MSZ-GA35VA - E : MUZ-GA35VA - E MUZ-GA35VAH - E CAPACITY:3.5(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

23 PERFORMANCE DATA COOL operation Rated frequency 88Hz MSZ-GA35VA - : MUZ-GA35VA - MUZ-GA35VAH - E CAPACITY:3.5(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 3

24 PERFORMANCE DATA HEAT operation MSZ-GA5VA - E : MUZ-GA5VA - E MUZ-GA5VAH - E Rated frequency 85Hz CAPACITY:3.(kW) INPUT:760(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 MSZ-GA35VA - E : MUZ-GA35VA - E MUZ-GA35VAH - E 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 4

25 9 ACTUATOR CONTROL MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - E MUZ-GA35VAH - E 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 9-3. Relation between main sensor and actuator Sensor Discharge temperature thermistor Purpose Protection Compressor Actuator LEV Outdoor fan motor R.V. coil w Indoor fan motor Defrost heater Solenoid valve Indoor coil temperature thermistor Defrost thermistor Fin temperature thermistor Ambient temperature thermistor Cooling : Coil frost prevention Heating : High pressure protection Cooling : High pressure protection Heating : Defrosting Protection Cooling : Low ambient temperature operation w w w w w w Heating : Defrosting (Heater) w MUZ-GA35VA MUZ-GA35VAH w MUZ-GA5VA MUZ-GA5VAH 5

26 0 SERVICE FUNCTIONS MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - MUZ-GA35VAH - E CHANGE IN DEFROST SETTING <JS> When the JS wire of the outdoor Inverter P.C. board is cut/ soldered, the defrost finish temperature is changed. (Refer to -7-.) JS Jumper wire soldered (Initial setting) none (cut) MUZ-GA5VA - E 5: 8: Defrost finish temperature MUZ-GA5VAH - E MUZ-GA35VA - 8: 5: 5: 8: E MUZ-GA35VAH - 8: 5: E TROUBLESHOOTING MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - MUZ-GA35VAH - E -. Cautions on troubleshooting. Before troubleshooting, check the following: ) Check the power supply voltage. ) Check the indoor/outdoor connecting wire for mis-wiring.. Take care 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. 3) When removing the electrical parts, be careful to the residual voltage of smoothing capacitor. 4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components. 5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. Lead wiring Housing point 3. 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. 3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration. 4) When troubleshooting, refer to -., -3. and -4. 6

27 -. 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 the indoor/outdoor unit failure mode recall function 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. 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 since all LCD in operation display section of the remote controller is displayed after 3 seconds. 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 since all LCD in operation display section of the remote controller is displayed after 3 seconds. W 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 TOO COOL or TOO WARM button to adjust the set temperature to 4:. 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 sounds are emitted at the same timing of 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 3 seconds? Stays ON for 3 seconds (without beep): The outdoor unit is abnormal. (OFF) W. Regardless of normal or abnormal, a short beep is emitted once as the signal is received. Indoor unit is normal. There is a possibility that the outdoor unit is abnormal. Confirm the presence of abnormality according to the flow chart of the detailed outdoor unit failure mode recall function. The indoor unit is abnormal. Check the blinking pattern, and refer to confirm the abnormal point. Make sure to check at least two consecutive blinking cycles. W The outdoor unit is abnormal. Check the blinking pattern, and refer to confirm the abnormal point (-.3.). Make sure to check at least two consecutive blinking cycles. W3 Releasing the failure mode recall function Release the failure mode recall function by the following procedures. With the remote controller headed towards the indoor unit, press any button that is not used in this failure mode recall function (e.g. TIMER button). OR Turn OFF the power supply and turn ON it again. Press RESET button of the remote controller. As for indoor unit, refer to service manual OB378. Repair the defective parts. Deleting the abnormal condition After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above. Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. 3Release 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 Repeated cycle Beeps W3.Blinking pattern when the outdoor unit is abnormal: Blinking at second OFF 3-second ON second interval.5-second OFF 3-second ON Blinking at 0.5- second interval ON OFF beep Repeated cycle Beeps beep Repeated cycle Beeps Repeated cycle 7

28 . Flow chart of the detailed outdoor unit failure mode recall function Operational procedure There is a possibility that the outdoor unit is abnormal. Confirm the presence of abnormality according to the following procedures. Confirm that the remote controller is in the failure mode recall function. W With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 5:. W. Regardless of normal or abnormal, short beeps are emitted as the signal is received. Confirmation of abnormality presence Does the left lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0.5 seconds? W Blinks: The outdoor unit is abnormal. Beep sounds are emitted at the same timing of the blinking of the left lamp of OPERATION INDICATOR lamp. (Blinks) (OFF) The outdoor unit is abnormal. Check the blinking pattern, and refer to confirm the abnormal point(-.3.). 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. With the remote controller headed towards the indoor unit, press any button that is not used in this failure mode recall function (e.g. TIMER button). OR Turn OFF the power supply and turn ON it 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 abnormal condition After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above. Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. 3Release 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 3-second ON Blinking at 0.5- second interval.5-second OFF 3-second ON Blinking at 0.5- second interval ON OFF beep Repeated cycle Beeps beep Repeated cycle Beeps Repeated cycle 8

29 3. Outdoor unit failure mode table The left lamp of OPERATION INDICATOR lamp OFF -time flash 3-time flash 4-time flash 5-time flash 6-time flash 7-time flash 8-time flash 9-time flash 0-time flash -time flash -time flash 4-time flash Abnormal point (Failure mode) Details of abnormal point LED indication Detection method Check point rmal Outdoor power system Outdoor thermistors Overcurrent protection Refrigerant system protection High pressure protection Fin temperature/ P.C. board temperature thermistor overheat protection Outdoor fan protection Outdoor control system Low discharge temperature protection Converter control system Overcurrent protection Outdoor unit (Other abnormality) Outdoor power system Discharge temperature thermistor Defrost thermistor Fin temperature thermistor P.C. board temperature thermistor Ambient temperature thermistor Overcurrent protection Compressor synchronous abnormality ( Compressor start-up failure protection) Discharge temperature thermistor overheat protection High pressure overheat protection Fin temperature/ P.C. board temperature thermistor overheat protection Outdoor fan protection nvolatile memory data Low discharge temperature protection DC voltage Compressor each phase current Compressor open-phase protection Outdoor unit -time flash every.5 seconds 3-time flash 4-time flash -time flash -time flash -time flash 7-time flash 5-time flash 8-time flash 9-time flash 0-time flash When it consecutively occurs 3 times that the compressor stops for overcurrent protection or start-up failure protection within minute after start-up. When thermistors short or open during compressor running. When 4A(MUZ-GA5VA, MUZ-GA5VAH)/ 4A(MUZ- GA35VA, MUZ-GA35VAH) current flow into intelligent power module. When waveform of compressor current is distorted. When discharge temperature thermistor exceeds6:. When 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-GA5VA, MUZ-GA5VAH)/ 83:(MUZ-GA35VA, MUZ-GA35VAH), or temperature of P.C. board temperature thermistor exceeds 8 :(MUZ-GA5VA, MUZ-GA5VAH)/ 85: (MUZ-GA35VA, MUZ-GA35VAH). When outdoor fan has stopped within 30 seconds 3-times in a row after outdoor fan start-up, unit stops. When nonvolatile memory data cannot be read properly, unit stops. When discharge temperature has been 50: or less for 0 minutes. When DC voltage of inverter cannot be detected normally. When compressor each phase current cannot be detected normally. When 4A(MUZ-GA5VA, MUZ-GA5VAH)/ 4A(MUZ- GA35VA, MUZ-GA35VAH) 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 failure. Reconnect compressor connector. Refer to -6.A"How to check inverter/ compressor". Check stop valve. Refer to -6.G"Check of outdoor thermistors". Defective outdoor thermistors can be identified by checking the blinking pattern of LED. 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". Refer to -6.G"Check of outdoor thermistors". 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. Check refrigerant circuit and refrigerant amount. Refer to -6.L"Check of LEV". 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 9

30 -3. Instruction of troubleshooting Start 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 in only Test Run operation. w Outdoor unit doesn't operate even in Test Run operation. w Unit doesn't operate normal operation in COOL or HEAT mode. Indoor unit operates, when EMERGENCY OPERATION switch is pressed. Indoor unit doesn't operate, when EMERGENCY OPERATION switch is pressed. If blinking of OPERATION INDICATOR lamp cannot be checked, it can be checked with failure mode recall function. 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". w As for "Test run opearation", refer to indoor unit service manual OB378. As for indoor unit, refer to service manual OB378. 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 3-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 (when outdoor unit doesn't work)". 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.G "Check of outdoor thermistors". Replace inverter P.C. board. Check -.. "Flow chart of the detailed outdoor unit failure mode recall function." 30

31 -4. Troubleshooting check table NOTE. The location of LED is illustrated at the right figure. Refer to LED lights up during normal operation. Inverter P.C. board (Parts side) Flashing LED Symptom LED indication Abnormal point/ Condition Detection method Check point Outdoor unit does not operate 'Outdoor unit stops and restarts 3 minutes later' is repeated -time flash every.5 seconds NOTE: For abnormality location, refer to 'Indoor troubleshooting check table'. Refer to service manual OB37. 6-time flash 4-time flash -time flash 3-time flash Outdoor power system Outdoor thermistors Outdoor control system serial signal Outdoor unit (Other abnormality) Overcurrent protection Discharge temperature overheat protection When it consecutively occurs 3times that the compressor stops for overcurrent protection or start-up failure protection within minute 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, compressor stops. When nonvolatile memory data cannot be read properly, compressor stops. (When the left lamp of OPERATION INDICATOR lamp of indoor unit lights up or flashes 7-time.) When the communication failure between the indoor and outdoor unit for 3 minutes. When outdoor unit is failure. When 4A(MUZ-GA5VA, MUZ-GA5VAH)/ 4A(MUZ- GA35VA, MUZ-GA35VAH) current flows into intelligent power module, compressor stops and restarts 3 minutes later. When discharge temperature thermistor exceeds 6:, compressor stops. Compressor can restart if discharge temperature thermistor reads 00: or less 3 minutes later. Check stop valve. Reconnect connector of compressor. Refer to -6.A "How to check inverter/ compressor". Refer to -6.C "Check of intelligent power module". Refer to -6.G "Check of outdoor thermistors". Replace inverter P.C. board. 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". Refer to -6.C "Check of intelligent power module". Check refrigerant circuit and refrigerant amount. Refer to -6.L "Check of LEV" Outdoor unit operates Outdoor unit operates 4-time flash 5-time flash -time flash 3-time flash 4-time flash 7-time flash Fin temperature /P.C. board temperature thermistor overheat protection High pressure protection 8-time flash Compressor synchronous abnormality 0-time flash -time flash 3-time flash 8-time flash 9-time flash Outdoor fan Compressor each phase current Frequency drop by current protection Frequency drop by high pressure protection Frequency drop by defrosting in COOL mode Frequency drop by discharge temperature protection Low discharge temperature protection PAM protection PAM: Pulse Amplitude Modulation Inverter check mode When temperature of fin temperature thermistor on the heat sink exceeds 8:(MUZ-GA5VA, MUZ-GA5VAH)/ 83:(MUZ-GA35VA, MUZ-GA35VAH) or temperature of P.C. board temperature thermistor exceeds 8:(MUZ-GA5VA, MUZ-GA5VAH)/ 85:(MUZ-GA35VA, MUZ-GA35VAH), compressor stops and restarts 3 minutes later. 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. When outdoor fan has stopped within 30 seconds 3-times a row after outdoor fan start-up, unit stops. When compressor each phase current cannot be detected normally When current from power outlet exceeds 5.A(MUZ-GA5VA, MUZ-GA5VAH)/ 6.A(MUZ-GA35VA, MUZ-GA35VAH), compressor frequency lowers. When 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 discharge temperature thermistor exceeds :, compressor frequency lowers. When discharge temperature has been 50: or less for 0 minutes. When the overcurrent flows into IGBT(Insulated Gate Bipolar transistor : TR8) or when the bus-bar voltage reaches 30V or more, PAM stops and restarts. When the connector of compressor is disconnected, inverter check mode starts. 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 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". Refer to -6.C "Check of intelligent power module". 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/compresssor". DC voltage When DC voltage of inverter cannot be detected normally. Check for short time power failure by such as lightning strike. Refer to -6.A "How to check inverter/compresssor". 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.G "Check of outdoor thermistors". 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". 0.5-second ON ON OFF.5-second OFF 3.5-second OFF

32 -5. Trouble criterion of main parts MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - MUZ-GA35VAH - E Part name Defrost thermistor (RT6) Ambient temperature thermistor(rt65) Discharge temperature thermistor(rt6) Fin temperature thermistor(rt64) Compressor(MC) Check method and criterion Measure the resistance with a tester. (Part temperature 0 C ~ 40 C) rmal 5 k" ~ 55 k" Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. (Part temperature 0 C ~ 40 C) rmal 50 k" ~ 600 k" rmal 30 k" ~ 80 k" Abnormal Open or short-circuit Abnormal Open or short-circuit Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. (Part temperature 0 C ~ 40 C) Abnormal Open or short-circuit Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 40 C) rmal U-V U-W V-W MUZ-GA5VA MUZ-GA5VAH.58 " ~.03" MUZ-GA35VA MUZ-GA35VAH.8 " ~.66 " Abnormal Open or short-circuit Figure WHT RED BLK 3 W V U Outdoor fan motor(mf) INNER FUSE (Only MUZ-GA5VA/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-GA5VA MUZ-GA35VA Abnormal WHT BLK BLK RED RED WHT MUZ-GA5VAH 9 " ~ 374 " 36 " ~ 304 " MUZ-GA35VAH 3 " ~ 4 " 3 " ~ 4 " 3 " ~ 4 " Open or short-circuit Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 40 C) rmal Abnormal MUZ-GA5VA MUZ-GA35VA MUZ-GA5VAH MUZ-GA35VAH Open or short-circuit.6 k" ~.6 k".0 k" ~.55 k" MUZ-GA5VA MUZ-GA35VA MUZ-GA5VAH MUZ-GA35VAH WHT RED BLK 3 W FUSE V U BLK RED WHT Expansion valve coil(lev) MUZ-GA35VA MUZ-GA35VAH Measure the resistance with a tester. (Part temperature : 0 C ~ 40 C) Color of the lead wire rmal WHT RED RED ORN 38 " ~ 50 " YLW BRN BRN BLU Abnormal Open or short-circuit WHT6 RED ORN4 LEV YLW5 BRN BLU3 Defrost heater(h) Measure the resistance with a tester. (Part temperature -0 C ~ 40 C) rmal 333 " ~ 48 " Abnormal Open or short-circuit Solenoid valve coil (R) MUZ-GA5VA MUZ-GA5VAH Measure the resistance with a tester. (Part temperature -0 C ~ 40 C) rmal,0 " ~,580 " Abnormal Open or short-circuit 3

33 -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 [V] 5V << Operation method>> Start cooling or heating operation by pressing EMERGENCY OPERATION switch on the indoor unit. (test-run mode : refer to page 8) <<Measurement point>> at 3 points BLK (U)-WHT (V) BLK (U)-RED (W) WHT(V)-RED (W) w Measure AC voltage between the lead wires at 3 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. 3. During this check, LED of inverter P.C. board flashes 9 times. 9-time flash.5-second OFF C Check of intelligent power module Disconnect the connector (CN6) between the compressor and the intelligent power module, and 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 ") 33

34 D Check of compressor Start -6.E "Check of compressor winding". Is the compressor normal? Replace the compressor. -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 3 points BLK-WHT BLK-RED WHT-RED <<Judgement>> Refer to ["] Abnormal [short] Infinite["] Abnormal [open] w Measure the resistance between the lead wires at 3 points. NOTE. Be sure to zero the ohmmeter before measurement.. Winding resistance for each phase at 0:. Refer to 3.SPECIFICATION. Ohmmeter indication " " " X X X rmal (~several ") Abnormal (0" short) Abnormal (infinite open) WHT V RED BLK 3 W U Compressor motor 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 EMERGENCY OPERATION switch on the indoor unit. (Test-run mode) <<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) 0~60 seconds Abnormal (compressor lock-out) 60 seconds~5 minutes Abnormal (refrigerant circuit defect) more than 5 minutes rmal 0 second 0 seconds 60 seconds 5 minutes Outdoor fan starts Abnormal (Compressor winding short or layer short) (Compressor connector poor contact) Abnormal (Compressor lock-out) Abnormal (Refrigerant circuit defect, etc.) rmal 34

35 When OPERATION INDICATOR lamp flashes 6-time. The thermistors in the outdoor unit are abnormal. G Check of outdoor thermistors Defrost thermistor RT6 Disconnect the connectors CN64, CN64 and CN643 from the inverter P.C. board. (Check the characteristics of each thermistor.) Measure the resistance between CN64 and. Discharge temperature thermistor RT6 Measure the resistance between CN64 3 and 4. Fin temperature thermistor RT64 Measure the resistance between CN64 and. Ambient temperature thermistor RT65 Measure the resistance between CN643 and. Does the resistance of the thermistor have the characteristics (- 7..)? Replace the thermistor except RT64. In case of RT64, replace the inverter P.C. board. Since RT64 is combined with the inverter P.C. board. Reconnect the connectors CN64, CN64 and CN643. Disconnect the connector (CN6) between the compressor and intelligent power module. Turn ON the power supply and press EMERGENCY OPERATION switch. Replace the inverter P.C. board. Does the unit operate 0 minutes or more except RT65? Reconnect the connector or the connecting wire. H Check of R.V. coil 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 EMERGENCY OPERATION switch twice (HEAT mode). Is there 30V AC between CN7 and on the power P.C.board 3 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 EMERGENCY OPERATION switch once (COOL mode). Is there 30V AC between CN7 and on the power P.C. board 3 minutes after the power supply is turned ON? Replace the power P.C. board. Defective R.V. coil Defective 4-way valve 35

36 Outdoor fan motor does not operate. I Check of outdoor fan motor MUZ-GA5VA - E MUZ-GA5VAH - E 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 EMERGENCY OPERATION switch. Rectify indoor/ outdoor connecting wire. Does the left lamp of OPERATION INDICATOR lamp on the indoor unit light up? Is there voltage 30V AC between indoor terminal block S and S? Replace the indoor electronic control P.C. board. Indoor/ outdoor connecting wire Outdoor terminal block S3 S S Fan motor 3 3 minutes after, is there voltage 30V AC between CN77 and 3 on the power P.C. board? Replace the power P.C. board. CN77 Power P.C. board Replace the outdoor fan motor. 36

37 Outdoor fan motor does not operate. I Check of outdoor fan motor MUZ-GA35VA - E MUZ-GA35VAH - E Is the resistance between each terminal of outdoor fan motor Disconnect CN93 from the inverter P.C. board. Turn ON the power supply. Rotate the outdoor fan slowly by hand, and measure the voltage of CN93 (Measurement of feedback output). Between (+) and 5(-) Between (+) and 5(-) Between 3(+) and 5(-) Inverter P.C. board (Solder side) CN93 CN93 ( Fixed to either 5V or 0V DC) Does the voltage between each terminal become 5V and 0V DC repeatedly? Does the outdoor fan rotate smoothly? Replace the outdoor fan motor. Ok 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 EMERGENCY OPERATION switch. Rectify indoor/ outdoor connecting wire. Indoor/ outdoor connecting wire Outdoor terminal block S3 S S Does the left lamp of OPERATION INDICATOR lamp on the indoor unit light up? Is there voltage 30V AC between the indoor terminal block S and S? Replace the indoor electronic control P.C. board. Is there voltage 80V ~ 370V 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.. Ok. If flash, refer to -4. DB6 Replace the inverter P.C. board. 80V~370V DC Inverter P.C. board (Solder side) 37

38 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. Does the current-limiting resistor (R64A or R64B) on the power P.C. board short out? (rmal resistance : 5') Turn ON the power supply and press EMERGENCY OPERATION switch of the indoor unit. 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 close minutes after outdoor unit power ON.) Replace the power P.C. board or the compressor. Replace the power P.C.board. Check other electric parts in the main circuit together in the case of the defective current-limiting resistor. Heating/Cooling does not work sufficiently. L Check of LEV (Expansion valve) Turn ON the power supply. 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 since all LCD in operation display section of the remote controller is displayed after 3 seconds. 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 since all LCD in operation display section of the remote controller is displayed after 3 seconds. With remote controller set toward the indoor unit, press OPERATE/ STOP(ON/ OFF) button and confirm one beep tone. LEV operates in full-opening direction. 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? Does the resistance of LEV have the characteristics? Refer to -5. Replace the LEV. Properly fix the LEV to the expansion valve. Measure each voltage between connector pins of CN74 on the inverter P.C. board..pin3(-) Pin(+).Pin4(-) Pin(+) 3.Pin5(-) Pin(+) 4.Pin6(-) Pin(+) Is there about 3~5V AC between each? NOTE: Measure the voltage by an analog tester. 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. Replace the inverter P.C. board. Replace the expansion valve. 38

39 Outdoor base gets frozen. M Check of defrost heater <MUZ-GA5VAH MUZ-GA35VAH> 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. 3) Does the heater protector remain conducted (not open)? 4) Are both ambient temperature thermistor and circuit of defrost heater securely connected to connectors? In HEAT mode, for more than 5 minutes, let the ambient temperature thermistor continue to read 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... 3 CN76 Is there 30V AC between CN7 and 3 on the power P.C. board? Refer to -7.. Is the voltage between CN76 (+)-3(-) 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. 3 CN7 6H H 30V AC Outdoor fan motor does not operate, or stops immediately after starting up. N Check of inverter P.C. board Check the outdoor fan motor. Refer to-6.i. Check the connection of the connectors. CN93 : driving output CN93 : feedback signal Inverter P.C.board (Solder side) CN93 CN93 Make the outdoor unit operate by starting EMERGENCY OPERATION. Check the LED indication on the inverter P.C. board. Does LED indicate 0-time flash? Check the corresponding section by LED indication. (0-time flash) Outdoor fan motor protection Replace the inverter P.C. board. 39

40 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 of 30V AC in the power supply? Turn ON the power supply. Check the power supply. Is there 30V AC between outdoor terminal block S and S? Press EMERGENCY OPERATION switch. Check the wiring. Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power to the indoor unit> Is the self-check of the indoor unit displayed 6 minutes after? Serial signal error display The left lamp of OPERATION INDICATOR lamp blinks quickly. Is there any miswiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire? Make them sure. A 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 S3. W Turn ON the power supply of the outdoor unit. 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. Inverter P.C.board (Parts side) LED In 3 minutes after turning ON the power supply of the outdoor unit, does the LED on the inverter P.C. board repeat quick blinking "3.6-second-OFF and 0.8-second-ON"? Be sure to check above in 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. When the inverter P.C. board is normal, LED also blinks 6 times after 3 minutes. (Lighting) Replace the inverter P.C. board. W W Be careful to the residual voltage of smoothing capacitor. Blinking A Turn OFF inverter-controlled lighting equipment. Turn OFF the power supply and then turn ON it again. Press EMERGENCY 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 receiving section of the indoor unit. Remove the short-circuit between outdoor terminal block S and S3. Is there amplitude of 0 to 0V DC between outdoor terminal block S and S3? <Confirmation of serial signal> Is there 30V AC between outdoor terminal block S and S? <Confirmation of power voltage> Be sure to release the failure-mode recall function after checking. Replace the indoor electronic control P.C. board. As for indoor unit, refer to service manual OB378. 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. Replace the indoor/outdoor connecting. 40

41 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. Enter the failure mode recall function. Do you hear the operation sound (click sound) of the solenoid valve every 5 seconds? The solenoid valve is normal. Correct the connection. Is CN93 on the outdoor power P.C. board firmly connected without disconnection or loose connection? Check the ambient temperature thermistor (RT65) in the outdoor unit. Disconnect CN93 and measure the voltage between the pins using tester. Trouble of the solenoid valve. Does it repeat to go 0V and 30VAC at 5 second interval? Trouble of the solenoid valve itself. Measure the solenoid valve resistance. Is the resistance normal? (Open or short: abnormal) Refer to -5. Trouble of the solenoid valve coil. 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? Measure the voltage between CN75 8(+) and (GND) on the outdoor inverter P.C. board. Correct the connection. Does it repeat to go 0V and VDC at 5 second interval? Replace the power P.C. board. Replace the inverter P.C. board. 4

42 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 3m, or is the distance between the antennas and the outdoor unit within 3m? Extend the distance between the antennas and the indoor unit, 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 3m? Extend the distance between the TV sets or radios and the indoor unit, or the TV sets or radios and the outdoor unit. Is there any antennas damage by rust or something, coaxial cable damage, or poor contact such as loosing of the connectors or wire disconnection of wiring of the antennas? Replace the antennas. Replace the coaxial cable. Is the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas in 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 is fulfilled, the electromagnetic noise may enter, depending on the electric field strength or the installation condition (combination of specific conditions such as antennas or wiring). Check the followings before asking for service..devices affected by the electromagnetic noise TV sets, radios (FM/AM broadcast, shortwave).channel, frequency, broadcast station affected by the electromagnetic noise 3.Channel, frequency, broadcast station unaffected by the electromagnetic noise 4.Layout of ; indoor/outdoor unit of the air condioner, 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 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 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. 4

43 -7. Test point diagram and voltage. MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - E MUZ-GA35VAH - E. Inverter P.C. board Back side of unit DB6 80V ~ 370V DC (+) (-) Output to drive compressor (LDV,LDW,LDU) Smoothing capacitor (C63C) Smoothing capacitor (C63B) Smoothing capacitor (C63A) (+) (+) 3(+) 45V 5GND MUZ-GA35VA,MUZ-GA35VAH Rotational frequency feedback signal of outdoor fan motor (CN93) LED monitor lamp Jumper wire for change in defrost setting (JS) Front side of unit Connecting wire with power P.C. board (CN75) 30V AC DB6 LEV connector (CN74) Defrost thermistor/rt6 (CN64) Discharge temperature thermistor/rt6 (CN64) Ambient temperature thermistor /RT65 (CN643) Fin temperature thermistor/rt64 (CN64) Output to drive outdoor fan motor (CN93) } MUZ-GA35VA MUZ-GA35VAH Connector for indoor/outdoor communication (CN60) Resistance(k") Fin temperature thermistor(rt64) Temperature(:) Resistance(k") Defrost thermistor(rt6) Ambient temperature thermistor(rt65) Temperature(:) 43 Resistance(k") Discharge temperature thermistor(rt6) Temperature(:)

44 MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - MUZ-GA35VAH - E. Power P.C. board Back side of unit MUZ-GA5VA MUZ-GA5VAH Solenoid valve coil (CN93) 30V AC Varistor (NR63) Varistor (NR6) Varistor (NR64) Front side of unit 30V AC MUZ-GA5VA MUZ-GA5VAH Output to drive outdoor Fan motor(cn77) 30V AC R.V.coil(CN7) 30V AC Connecting wire with inverter P.C.board (CN76) Refer to -6.M 30V AC Heater connector (CN7) Refer to -6.M } MUZ-GA5VAH MUZ-GA35VAH 44

45 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-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - E MUZ-GA35VAH - OUTDOOR UNIT E OPERATING PROCEDURE. Removing the cabinet. () Remove the screw fixing the service panel. (See Photo.) () Pull down the service panel and remove it. (See Photo.) (3) 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 45

46 OPERATING 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.) (3) Disconnect the ground wires (See Photo 3.), the lead wire to the reactor and the following connectors; <Power P.C. board> CN7 (4-way valve) CN77 (Fan motor) MUZ-GA5VA/GA5VAH- E CN7 (Defrost heater) MUZ-GA5/GA35VAH- E CN93 (Solenoid valve coil) MUZ-GA5VA/GA5VAH- E <Inverter P.C. board> CN93,CN93 (Fan motor) MUZ-GA35VA/GA35VAH- E CN64 (Defrost thermistor and discharge temperature thermistor) CN643 (Ambient temperature thermistor) CN74 (LEV) MUZ-GA35VA/GA35VAH- E (4) Remove the compressor connector (CN6). (5) Remove the screws fixing the relay panel. (See Photo 3.) (6) Remove the inverter assembly. (See Photo 3.) (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 3 Photo 4 Heat sink PHOTOS Screws of the relay panel Inverter P.C. board Power P.C. board Screws of the ground wires 3. 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.) (3) 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.) (3) 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 46 Discharge temperature thermistor

47 OPERATING 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.) (3) Disconnect the connectors for outdoor fan motor. (4) Remove the propeller nut. (5) Remove the propeller. (6) Remove the screws fixing the fan motor. (See Photo 7.) (7) Remove the fan motor. 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.) (3) 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 47

48 3 PARTS LIST MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - MUZ-GA35VAH - E 3-. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS

49 MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - MUZ-GA35VAH - E 3-. OUTDOOR UNIT STRUCTURAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E CABINET GRILLE PROPELLER PROPELLER BASE BASE COMPRESSOR COMPRESSOR COMPRESSOR RUBBER SET STOP VALVE (GAS) STOP VALVE (LIQUID) SERVICE PANEL BACK PANEL EXPANSION VALVE EXPANSION VALVE COIL 4-WAY VALVE 4-WAY VALVE THERMO HOLDER CONDENSER WIRE NET CONDENSER NET CONDENSER NET SEPARATOR SEPARATOR MOTOR SUPPORT MOTOR SUPPORT TOP PANEL OUTDOOR HEAT EXCHANGER OUTDOOR FAN MOTOR OUTDOOR FAN MOTOR DEFROST HEATER HEATER PROTECTOR CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE CHECK VALVE SOLENOID VALVE COIL SOLENOID VALVE MC MC LEV MF MF H 6H R 3 3 Symbol. Part. Part Name in Wiring MUZ- GA5VA- Diagram E MUZ- GA35VA- E 3 Q'ty/unit MUZ- GA5VAH- E MUZ- GA35VAH- E 3 Remarks KNB065FDTH KNB073FDVH 3RUBBERS/SET {9.5 {6.35 RA6V- RC0J50- {3.0 {.0 40 {3.0 { {3.0 {

50 MUZ-GA5VA - E MUZ-GA35VA - E MUZ-GA5VAH - MUZ-GA35VAH - E 3-. OUTDOOR UNIT ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration Part. E E E E E E E E E E E E E E E E E E E Part Name REACTOR POWER P.C. BOARD POWER P.C. BOARD POWER P.C. BOARD POWER P.C. BOARD R.V. COIL R.V. COIL THERMISTOR SET AMBIENT TEMPERATURE THERMISTOR FUSE HOLDER FUSE TERMINAL BLOCK TERMINAL BLOCK INVERTER P.C. BOARD INVERTER P.C. BOARD INVERTER P.C. BOARD INVERTER P.C. BOARD FUSE VARISTOR Symbol in Wiring Diagram L6 S4 S4 RT6,RT6 RT65 F6 TB TB F7,F80 NR6,NR63,NR64 MUZ- GA5VA- E Q'ty/unit MUZ- GA5VAH- E MUZ- GA35VA- E MUZ- GA35VAH- E Remarks DEFROST, DISCHARGE 50V/0A 3P 3P Including heat sink and RT64 Including heat sink and RT64 Including heat sink and RT64 Including heat sink and RT64 50V/3.5A 50

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