SERVICE MANUAL MUZ-GA50VA - MUZ-GA60VA- MUZ-GA60VA - MUZ-GA60VA - MUZ-GA71VA - MUZ-GA71VA - E2 OUTDOOR UNIT. No. OB389 REVISED EDITION-F

Transcription

1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS Revision F: MUZ-A60VA- E3 has been added. Please void OB389 REVISED EDITION-E. OUTDOOR UNIT SERVICE MANUAL Wireless type Models E MUZ-A50VA - E MUZ-A60VA - E2 MUZ-A60VA - E3 MUZ-A60VA - E MUZ-A7VA - MUZ-A7VA - E2 HFC utilized R40A. OB389 REVISED EDITION-F CONTENTS Indoor unit service manual MSZ-A VA Series (OB388). TECHNICAL CHANES 3 2. PART NAMES AND FUNCTIONS 6 3. SPECIFICATION 6 4. NOISE CRITERIA CURVES 7 5. OUTLINES AND DIMENSIONS 8 6. WIRIN DIARAM 9 7. REFRIERANT SYSTEM DIARAM 2 8. PERFORMANCE CURVES 5 9. ACTUATOR CONTROL SERVICE FUNCTIONS 27. TROUBLESHOOTIN DISASSEMBLY INSTRUCTIONS PARTS LIST RoHS PARTS LIST 54 NOTE: RoHS compliant products have <> mark on the spec name plate. For servicing of RoHS compliant products, refer to the RoHS Parts List. Contents of SERVICE FUNCTIONS(0) have been removed.

2 Revision A : RoHS PARTS LIST has been added. Failure mode recall function(-2.) has been changed. Check of HPS(-6.H) has been corrected. Revision B: Compressor has been changed. (MUZ-A50/60VA) Previous New Model SNB30FLDH SNB30FLDH PARTS LIST number E E RoHS PARTS LIST number E E Revision C: MUZ-A60/7VA- E2 have been added. Check of outdoor thermistors(-6.f) has been corrected. Contents of SERVICE FUNCTIONS(0) have been removed as these models do not have the functions. Revision D: PARTS LIST and RoHS PARTS LIST have been changed. Revision E: REFRIERANT SYSTEM DIARAM has been changed for MUZ-A60VA- E2. Revision F: MUZ-A60VA- E3 has been added. 2

3 TECHNICAL CHANES MUZ-A8YV - E MUZ-A50VA - E MUZ-A24YV - E MUZ-A60VA - E MUZ-A26YV - MUZ-A7VA - E.Indication of capacity has been changed.(btu base kw base) 2.Outdoor electronic control P.C. board has been changed. 3.ise filter P.C. board has been changed. 4.Length of fan motor lead wire has been changed. 5.Shape of relay panel has been changed. 6.Signal of terminal block has been changed. MUZ-A60VA - E MUZ-A60VA - E2.Compressor has been changed. (SNB30FLDH SNB30FLEH) 2.Outdoor electronic control P.C. board has been changed. MUZ-A60VA - MUZ-A7VA - E2 E MUZ-A60VA - E3.Compressor has been changed. (SNB30FLEH SNB30FBH) 2.Outdoor electronic control P.C. board has been changed. 3.Refrigerant circuit has been changed. MUZ-A7VA - E2.Outdoor electronic control P.C. board has been changed. 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 R22 air conditioners. As R40A has working pressure approximate.6 times as high as that of R22, some special tools and piping parts/ materials are required. Refer to the table below. 2 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 R22. 3 For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R40A. (Refer to 2. 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-32: HFC-25 (50%:50%) Refrigerant handling Pseudo-azeotropic refrigerant Chlorine t included Safety group (ASHRAE) A/A Molecular weight 72.6 Boiling point (:) -5.4 Steam pressure [25:](Mpa).557 Saturated steam density [25:](kg/K) 64 Combustibility n combustible ODP w 0 WP w2 730 Refrigerant charge method From liquid phase in cylinder Additional charge on leakage Possible Kind Incompatible oil Color n Smell n w :Ozone Depletion Potential : based on CFC- w2 :robal Warming Potential : based on CO 2 Previous refrigerant R22 R22 (00%) Single refrigerant Included A n combustible as phase Possible Compatible oil Light yellow n 3

4 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, 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]) =0.2(kgf/f [auge]) Conversion chart of refrigerant temperature and pressure (MPa [auge]) R40A Saturated liquid pressure R22 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]) =0.2(kgf/f [auge]) (:).Tools dedicated for the air conditioner with R40A refrigerant The following tools are required for R40A refrigerant. Some R22 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 20 threads to /2 UNF with 20 threads. R40A tools Can R22 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 6.35 mm and 9.52 mm 2.7 mm and 5.88mm 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 R22 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 4

5 2.Refrigerant piping Specifications Use the refrigerant pipes that meet the following specifications. Pipe Outside diameter mm Wall thickness Insulation material For liquid For gas mm 0.8 mm 0.8 mm.0 mm 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 (6.35, 9.52, 2.7),.0 mm (5.88). Never use any pipe with a thickness less than 0.8 mm (6.35, 9.52, 2.7),.0 mm (5.88), as the pressure resistance is insufficient. 2 Flaring work and flare nut Flaring work for R40A pipe differs from that for R22 pipe. For details of flaring work, refer to installation manual FLARIN WORK. Pipe diameter mm Dimension of flare nut R40A R Refrigeration 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, capacity 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. Union Stop valve Indoor unit Refrigerant gas cylinder operating valve Liquid pipe as pipe Service port 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 5

6 2 PART NAMES AND FUNCTIONS MUZ-A50VA MUZ-A60VA MUZ-A7VA Air inlet (back and side) Piping ACCESSORIES Drain socket 2 Drain cap [33 2 Drain hose Air outlet Drain outlet 3 SPECIFICATION Outdoor model MUZ-A50VA MUZ-A60VA MUZ-A7VA Capacity Electrical data Function Power supply Capacity Rated frequency(min.-max.) Dehumidification Air flow(high/low) Power outlet Running current Power input Power factor Starting current Compressor motor current Fan motor current Model Output Winding resistance(at 20:) Model Winding resistance(at 20:) Dimensions WOHOD Weight Sound level(high/low) Fan speed(high/low) Fan speed regulator Refrigerant filling capacity(r40a) Refrigeration oil(model) kw r/h K /h A A W % A A A Coefficient of performance(c.o.p) Compressor Fan motor Special remarks W " " mm kg db rpm kg Cooling Heating Single phase 230V,50Hz 5.0( ) 5.9( ) 2.5 2,940/,650 2,940/2, , SNB30FLDH or SNB30FLDH 850 U-V 0.45 W-U 0.45 V-W 0.45 RC0J60-AA -WHT 5.2 WHT-RED 5.2 RED o850o330 53/5 800/480 NOTE : Test conditions are based on ISO 55. Cooling : Indoor DB 27: WB 9: Outdoor DB 35: WB (24:) Heating : Indoor DB 20: WB 5: Outdoor DB 7: WB 6: Refrigerant piping length (one way): 5m Measured under rated operating frequency NEO22 7.0, /53 800/620 E E2 E3 Cooling Single phase 230V,50Hz 6.0( ) 3.0 2,940/, , SNB30FLDH or SNB30FLDH SNB30FLEH SNB30FBH 850 U-V 0.45 W-U 0.45 V-W 0.45 RC0J60-AA -WHT 5.2 WHT-RED 5.2 RED o850o330 53/5 800/ NEO22 Heating 6.8(0.9-8.) 2,940/2, , /53 800/620 Cooling Heating Single phase 230V,50Hz 7.( ) 3.8 2,940/,650 2,940/2, ,360 2, TNB220FMCH,300 U-V.4 W-U.4 V-W.4 RC0J60-AA -WHT 5.2 WHT-RED 5.2 RED o850o330 53/5 800/ NEO22 8.( ) 55/53 800/620 6

7 Specifications and rating conditions of main electric parts Item Model MUZ-A50VA MUZ-A60VA MUZ-A7VA Smoothing capacitor Current transformer Current transformer Fuse Fuse Fuse Intelligent power module High pressure switch Intelligent power module Reactor Expansion valve coil Power factor controller Resistor Resistor Resistor Solenoid coil relay Terminal block Terminal block Relay R.V. coil (CB,2,3) (CT,2) (CT6) (F64) (F80) (F9) (HC930) (HPS) (IPM) (L) (LEV) (PFC) (R64A,B) (R937A,B) (RS~4) (SSR6) (TB) (TB2) (X64) (2S4) V ETQ9Z68AY ETQ9Z53AY 250V 2A 250V 3.5A 250V A PS266-RZ ACB-DB56(for ) E3 PS2244-A 340µH 20A DC 2 V PS5259-A 0" 0W." 2W 2% 0.04" 7W TLP3506 3P 3P 4A AC 220 ~ 240 V ACB-DB56 4 NOISE CRITERIA CURVES MUZ-A50VA MUZ-A60VA MUZ-A7VA 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-30 NC-20 FAN SPEED FUNCTION SPL(dB(A)) LINE COOLIN 53 High HEATIN 55 Test conditions Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:) Heating : Dry-bulb temperature 7: Wet-bulb temperature 6: MICROPHONE OUTDOOR UNIT m 7

8 5 OUTLINES AND DIMENSIONS MUZ-A50VA MUZ-A60VA MUZ-A7VA REQUIRED SPACE Unit: mm mm or more Open as a rule 500 mm or more if the front and both sides are open 00 mm or more 200 mm or more if there are obstacles to both sides Open as a rule 500 mm or more if the back, both sides and top are open 350 mm or more Service panel Liquid refrigerant pipe joint Refrigerant pipe (flared) [6.35 (MUZ-A50/60) [9.52 (MUZ-A7) as refrigerant pipe joint Refrigerant pipe (flared) [2.7 (MUZ-A50) [5.88 (MUZ-A60/7) 8

9 6 WIRIN DIARAM MUZ-A50VA MUZ-A60VA - E MUZ-A60VA - E2 R64B WHT BLU LDE2 CN92 YLW BRN RN/YLW NOISE FILTER P.C.BOARD TO INDOOR UNIT CONNECTIN 230V~ TB2 S 2-24V S3 3 CN6 RED CN CN3 2 PFC POWER SUPPLY ~/N 230V 50Hz CIRCUIT BREAKER RT65 R64A NR64 CN RS RS2 RS3 RS4 LD9 POWER BOARD RN RT64 F80 RED WHT CB CB2 CB3 BLU WHT BLU NF ELECTRONIC CONTROL P.C.BOARD L IPM CT2 CT U RY PNK ORN BLU YLW RED WHT RED HC930 RN RN BLU BLU SSR6 CN CN795 6 CN4 2 W 3 CN60 S2 TAB CT6 2 X CN CN702 2 CN70 LD2 3 LD CN80 CN LDE F9 F64 TB L N PE TAB2 2S4 TAB4 2 RED RED S 3 4 YLW R 7 2 CN CN2 2 CN903 2 CN5 RT6 RT62 RT68 LEV T80 R937A R937B CN932 V V WHT W MC U MF SYMBOL NAME CB~3 SMOOTHIN CAPACITOR CT, 2 CURRENT TRANSFORMER CT6 CURRENT TRANSFORMER F64 FUSE (T2AL 250V) F80 FUSE (T3.5AL 250V) FUSE (TAL 250V) F9 HC930 INTELLIENT POWER MODULE IPM INTELLIENT POWER MODULE L REACTOR LEV EXPANSION VALVE COIL SYMBOL NAME MC COMPRESSOR MF RT6 RT62 OUTDOOR FAN MOTOR NOISE FILTER NF NR64 VARISTOR PFC R64A,B RESISTOR POWER FACTOR CONTROLLER R937A, B RESISTOR RS~4 RESISTOR DEFROST THERMISTOR DISCHARE TEMPERATURE THERMISTOR SYMBOL NAME RT64 FIN TEMPERATURE THERMISTOR RT65 AMBIENT TEMPERATURE THERMISTOR RT68 OUTDOOR HEAT EXCHANER TEMPERATURE THERMISTOR T80 TRANSFORMER SSR6 SOLENOID COIL RELAY TB TERMINAL BLOCK TB2 TERMINAL BLOCK X64 RELAY 2S4 R.V. COIL NOTES:.About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing. 2.Use copper conductors only (for field wiring). 3.Symbols below indicate. :Terminal block :Connector 9

10 MUZ-A60VA - E3 0

11 MUZ-A7VA X64 3 R64A R64B TAB4 RED 2 3 L 4 RED YLW WHT BLU LDE2 CN92 CN902 2 CN903 2 YLW BRN NOISE FILTER P.C.BOARD TO INDOOR UNIT CONNECTIN 230V~ TB2 S 2-24V RN/YLW S3 3 CN6 RED CN CN3 2 PFC POWER SUPPLY ~/N 230V 50Hz CIRCUIT BREAKER RED HPS RED RT65 NR64 CN RS RS3 RS2 RS4 LD9 POWER BOARD RN RT64 F80 RED WHT CB CB2 CB3 BLU WHT BLU NF ELECTRONIC CONTROL P.C.BOARD CN68 2 IPM CT2 CT U RY PNK ORN BLU YLW RED WHT RED HC930 RN RN BLU BLU SSR6 CN CN795 6 CN4 2 W 3 CN60 S2 TAB CT CN CN702 2 CN70 LD2 3 LD CN80 CN LDE F9 F64 TB L N PE TAB2 2S4 R S CN2 2 CN5 RT6 RT62 RT68 LEV T80 R937A R937B CN932 V V WHT W MC U MF SYMBOL NAME CB~3 SMOOTHIN CAPACITOR CT, 2 CURRENT TRANSFORMER CT6 CURRENT TRANSFORMER F64 FUSE (T2AL 250V) F80 FUSE (T3.5AL 250V) F9 FUSE (TAL 250V) HC930 INTELLIENT POWER MODULE HPS HIH PRESSURE SWITCH IPM INTELLIENT POWER MODULE L REACTOR LEV EXPANSION VALVE COIL SYMBOL NAME MC COMPRESSOR MF RT6 RT62 RT64 OUTDOOR FAN MOTOR NOISE FILTER NF NR64 VARISTOR POWER FACTOR CONTROLLER PFC R64A,B RESISTOR R937A, B RESISTOR RS~4 RESISTOR DEFROST THERMISTOR DISCHARE TEMPERATURE THERMISTOR FIN TEMPERATURE THERMISTOR SYMBOL NAME RT65 AMBIENT TEMPERATURE THERMISTOR RT68 OUTDOOR HEAT EXCHANER TEMPERATURE THERMISTOR SOLENOID COIL RELAY T80 TRANSFORMER SSR6 TB TERMINAL BLOCK TB2 TERMINAL BLOCK X64 RELAY 2S4 R.V. COIL NOTES:.About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing. 2.Use copper conductors only (for field wiring). 3.Symbols below indicate. :Terminal block :Connector

12 7 REFRIERANT SYSTEM DIARAM MUZ-A50VA MUZ-A60VA - E Unit:mm Refrigerant pipe [2.7 (MUZ-A50VA) (with heat insulator) [5.88 (MUZ-A60VA) 4-way valve Muffler #00 Flared connection Stop valve (with service port) Discharge temperature thermistor RT62 Defrost thermistor RT6 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Refrigerant pipe [6.35 (with heat insulator) Stop valve Strainer Receiver #00 Capillary tube [3.6 [ Compressor LEV Strainer #00 Outdoor heat exchanger temperature thermistor RT68 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating MUZ-A60VA - E2 Unit:mm Refrigerant pipe [5.88 (with heat insulator) 4-way valve Oil separator Capillary tube [.8 [ Flared connection Stop valve (with service port) Strainer Defrost #00 thermistor RT6 Discharge temperature thermistor RT62 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Refrigerant pipe [6.35 (with heat insulator) Strainer Receiver #00 Stop valve Capillary tube [3.6 [ Compressor LEV Strainer #00 Outdoor heat exchanger temperature thermistor RT68 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating 2

13 MUZ-A60VA - E3 Unit:mm Refrigerant pipe [5.88 (with heat insulator) 4-way valve Muffler #00 Flared connection Stop valve (with service port) Discharge temperature thermistor RT62 High-pressure switch Defrost thermistor RT6 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Refrigerant pipe [6.35 (with heat insulator) Stop valve Strainer Receiver #00 Capillary tube [3.6 [ Compressor LEV Strainer #00 Outdoor heat exchanger temperature thermistor RT68 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating MUZ-A7VA Refrigerant pipe [5.88 (with heat insulator) Capillary tube [.8 [ Oil separator High-pressure 4-way valve switch Unit:mm Flared connection Stop valve (with service port) Strainer Defrost #00 thermistor RT6 Discharge temperature thermistor RT62 Outdoor heat exchanger Ambient temperature thermistor RT65 Flared connection Refrigerant pipe [9.52 (with heat insulator) Strainer Receiver #00 Stop valve Capillary tube [3.6 [ Compressor LEV Strainer #00 Outdoor heat exchanger temperature thermistor RT68 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating 3

14 MAX. REFRIERANT PIPIN LENTH and MAX. HEIHT DIFFERENCE Model MUZ-A50VA MUZ-A60VA MUZ-A7VA Refrigerant piping : m Max. length Max. Height difference A B 30 5 Piping size O.D : mm as Liquid Indoor unit Max. Height difference B Refrigerant Piping Max. length A Outdoor unit ADDITIONAL REFRIERANT CHARE(R40A : g) Model Outdoor unit precharged 7m 0m Refrigerant piping length (one way) 5m 20m 25m 30m MUZ-A50VA MUZ-A60VA, Calculation : Xg=20g/m (Refrigerant piping length (m) 7) Model Outdoor unit precharged 7m 0m Refrigerant piping length (one way) 5m 20m 25m 30m MUZ-A7VA 2, ,265 Calculation : Xg=55g/mo(Refrigerant piping length(m)-7) NOTE : Refrigerant piping exceeding 7m requires additional refrigerant charge according to the calculation. 4

15 8 PERFORMANCE CURVES MUZ-A50VA MUZ-A60VA MUZ-A7VA The standard 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 ~ 264V, 50Hz (2) AIR FLOW Air flow should be set at MAX. (3) MAIN READINS () Indoor intake air wet-bulb temperature : C WB } Cooling (2) 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 this page and 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. } Heating How to measure the indoor air wet-bulb / dry-bulb temperature difference. Attach at least 2 sets of wet and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 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. 2. Attach at least 2 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 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 (:) MSZ-A50VA MUZ-A50VA at Rated frequency MSZ-A60VA MUZ-A60VA at Rated frequency MSZ-A7VA MUZ-A7VA at Rated frequency Outdoor intake air Dry-bulb temperature (:) Outdoor intake air Dry-bulb temperature (:) 5

16 Indoor air Dry-bulb temperature difference (degree) Indoor intake air Dry-bulb temperature (:) Indoor intake air Dry-bulb temperature (:) MSZ-A50VA MUZ-A50VA at Rated frequency MSZ-A60VA MUZ-A60VA at Rated frequency MSZ-A7VA MUZ-A7VA at Rated frequency 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 AND INPUT CORRECTION BY OPERATIONAL FREQUENCY OF COMPRESSOR MUZ-A50VA.5 Correction of Cooling capacity Correction of Cooling total input.5.5 Correction of Heating capacity Correction of Heating total input.5 Capacity correction factors Input correction factors Capacity correction factors Input 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 MUZ-A60VA.5 Correction of Cooling capacity Correction of Cooling total input.5.5 Correction of Heating capacity Correction of Heating total input.5 Capacity correction factors Input correction factors Capacity correction factors Input 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.5 MUZ-A7VA Correction of Cooling capacity Correction of Cooling total input.5.5 Correction of Heating capacity Correction of Heating total input.5 Capacity correction factors Input correction factors Capacity correction factors Input 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 6

17 8-3. TEST RUN OPERATION (How to operate fixed-frequency operation). Press EMERENCY OPERATION switch to COOL or HEAT mode (COOL : Press once, HEAT : Press twice). 2. 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 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 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Both indoor and outdoor unit are under the same temperature/humidity condition. 2 Operation : TEST RUN OPERATION (refer to 8-3.) Dry-bulb temperature(:) Relative humidity(%) 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]) =0.2(kgf/f [auge]) MUZ-A50VA (kgf/f [auge])(mpa [auge]) MUZ-A50VA Outdoor low pressure Outdoor unit current(a) ( C) ( C) (%) (%) Ambient temperature( C) Ambient humidity(%) Ambient temperature( C) Ambient humidity(%) MUZ-A60VA (kgf/f [auge]) (MPa [auge]) MUZ-A60VA Outdoor low pressure Outdoor unit current(a) ( C) ( C) (%) (%) Ambient temperature( C) Ambient humidity(%) Ambient temperature( C) Ambient humidity(%) MUZ-A7VA MUZ-A7VA (kgf/f [auge]) (MPa [auge]) Outdoor low pressure Outdoor unit current(a) ( C) ( C) (%) (%) Ambient temperature( C) Ambient humidity(%) Ambient temperature( C) Ambient humidity(%) 7

18 HEAT operation Condition : Dry bulb temperature ( C) Wet bulb temperature ( C) Indoor Outdoor Operation : TEST RUN OPERATION (refer to 8-3.) 0.0 MUZ-A50VA Outdoor unit current (A) (:) Ambient temperature( C) 6.0 MUZ-A60VA 2.0 MUZ-A7VA Outdoor unit current (A) Outdoor unit current (A) (:) Ambient temperature( C) (:) Ambient temperature( C) 8

19 PERFORMANCE DATA COOL operation at Rated frequency MSZ-A50VA : MUZ-A50VA CAPACITY:5.0(kW) SHF:0.65 INPUT:460(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

20 PERFORMANCE DATA COOL operation at Rated frequency MSZ-A50VA : MUZ-A50VA CAPACITY:5.0(kW) SHF:0.65 INPUT:460(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

21 PERFORMANCE DATA COOL operation at Rated frequency MSZ-A60VA : MUZ-A60VA CAPACITY:6.0(kW) SHF:0.64 INPUT:930(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

22 PERFORMANCE DATA COOL operation at Rated frequency MSZ-A60VA : MUZ-A60VA CAPACITY:6.0(kW) SHF:0.64 INPUT:930(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 at Rated frequency MSZ-A7VA : MUZ-A7VA CAPACITY:7.(kW) SHF:0.63 INPUT:2420(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

24 PERFORMANCE DATA COOL operation at Rated frequency MSZ-A7VA : MUZ-A7VA CAPACITY:7.(kW) SHF:0.63 INPUT:2420(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

25 PERFORMANCE DATA HEAT operation at Rated frequency MSZ-A50VA : MUZ-A50VA CAPACITY:5.9(kW) INPUT:630(W) OUTDOOR WB(:) INDOOR DB(:) Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT MSZ-A60VA : MUZ-A60VA CAPACITY:6.8(kW) INPUT:940(W) OUTDOOR WB(:) INDOOR DB(:) Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT MSZ-A7VA : MUZ-A7VA CAPACITY:8.(kW) INPUT:2450(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 25

26 9 ACTUATOR CONTROL MUZ-A50VA MUZ-A60VA MUZ-A7VA 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 ON OFF ON OFF 5 seconds 5 seconds 9-2. 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 Relation between main sensor and actuator. Sensor Discharge temperature thermistor Purpose Protection Compressor Actuator Outdoor LEV fan motor R.V. coil Indoor coil temperature thermistor Defrosting Protection Defrost thermistor Defrosting Fin temperature thermistor Protection Outdoor heat exchanger temperature Protection Ambient temperature thermistor Protection 26

27 0 SERVICE FUNCTIONS Contents of SERVICE FUNCTIONS have been removed. TROUBLESHOOTIN MUZ-A50VA MUZ-A60VA MUZ-A7VA -. CAUTIONS ON TROUBLESHOOTIN. Before troubleshooting, check the following ) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 2. 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, then after confirming the horizontal vane is closed, turn OFF the breaker and / or disconnect the power plug. 2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board. 3) When removing the electrical parts, be careful to the residual voltage of smoothing capacitor. 4) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components. 5) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. 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. 2) Before servicing check that the connector and terminal are connected properly. 3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration. 4) When troubleshooting, refer to -2., -3. and

28 -2. FAILURE MODE RECALL FUNCTION Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though LED indication listed on the troubleshooting check table (-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. <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. 2 First, release RESET button. And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds. Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 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. W2 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 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 -2.2) 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. W2 The outdoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to -2.3). 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. 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. 2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 3Press 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. NOTE.Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly. 2.If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. W2. Blinking pattern when the indoor unit is abnormal: 2.5-second OFF Blinking at 0.5- second interval 2.5-second OFF Blinking at 0.5- second interval ON OFF Beeps Repeated cycle Beeps Repeated cycle Beeps Repeated cycle W3.Blinking pattern when the outdoor unit is abnormal: Blinking at second OFF 3-second ON second interval 2.5-second OFF 3-second ON Blinking at 0.5- second interval ON OFF beep Repeated cycle Beeps beep Repeated cycle Beeps Repeated cycle 28

29 2. Flow chart of the detailed outdoor unit failure mode recall function Operational procedure The outdoor unit might be abnormal. Confirm if outdoor unit is abnormal according to the following procedures. Confirm that the remote controller is in the failure mode recall function. With the remote controller headed towards the indoor unit, press TOO COOL or TOO WARM button to adjust the set temperature to 25:. W W. Regardless of normal or abnormal condition, 2 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. W2 (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 -2.3.). Make sure to check at least two consecutive blinking cycles. W2 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. 2Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. 3Press 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. NOTE. Make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly. 2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. W2.Blinking pattern when outdoor unit is abnormal: 2.5-second OFF 3-second ON Blinking at 0.5- second interval 2.5-second OFF 3-second ON Blinking at 0.5- second interval ON OFF beep Repeated cycle Beeps beep Repeated cycle Beeps Repeated cycle 29

30 3. Outdoor failure mode table The left lamp of OPERATION INDICAOR lamp(indoor unit) OFF 2-time flash Abnormal point (Failure mode / protection) ne (rmal) Outdoor power system LED indication (Outdoor P.C. board) LED LED Lighting Lighting Condition Overcurrent protection stop is continuously performed 3 times within minute after the compressor gets started, or when converter protection stop or bus-bar voltage protection stop is continuously performed 3 times within 3 minutes after start-up. Correspondence Check the connection of the compressor connecting wire. Refer to -4.E "How to check inverter / compressor". Check the stop valve. Indoor/outdoor unit failure mode recall function 3-time flash Discharge temperature thermistor Defrost thermistor Ambient temperature thermistor Fin temperature thermistor P.C. board temperature thermistor Outdoor heat exchanger temperature thermistor Lighting Lighting Lighting Once Once Twice Lighting 3 times Lighting 4 times Lighting 9 times Thermistor shorts or opens during compressor running. Refer to -6.F "Check of outdoor thermistors". Replace the outdoor electronic control P.C. board. Refer to -6.F "Check of outdoor thermistors". 4-time flash 5-time flash Overcurrent Discharge temperature Once oes out Lighting Lighting 28A current flows into intelligent power module. Discharge temperature exceeds 6 C during operation. Compressor can restart if discharge temperature thermistor reads 00: or less 3 minutes later. Reconnect compressor connector. Refer to -6.E "How to check inverter/ compressor." Check the stop valve. Check refrigerant circuit and refrigerant amount. Refer to -6.D "Check of LEV". 6-time flash High pressure Lighting Lighting High-pressure is detected with the high-pressure switch (HPS) during operation. Check refrigerant circuit and refrigerant amount. Check the stop valve. The outdoor heat exchanger temperature exceeds 70:during cooling or the indoor gas pipe temperature exceeds 70: during heating. 7-time flash Fin temperature P.C. board temperature 3 times oes out 4 times oes out The fin temperature exceeds 87: during operation. The P.C. board temperature exceeds 70: during operation. Check around outdoor unit. Check outdoot unit air passage. Refer to -6. "Check of outdoor fan motor". 8-time flash Outdoor fan motor Lighting Lighting Failure occurs continuously 3 times within 30 seconds after the fan gets started. Refer to -6. "Check of outdoor fan motor". 9-time flash 0-time flash nvolatile memory data Discharge temperature Lighting 5 times Lighting Lighting nvolatile memory data cannot be read properly. The frequency of the compressor is kept 80Hz or more and the discharge temperature is kept under 39: for more than 20 minutes. Replace the outdoor electronic control P.C. board. Check refrigerant circuit and refrigerant amount. Refer to -6.D "Check of LEV". 30

31 The left lamp of OPERATION INDICATOR lamp(indoor unit) -time flash Abnormal point (Failure mode / protection) Communication error between P.C. boards LED indication (Outdoor P.C. board) LED LED 2 Lighting 6 times Condition Communication error occurs between the electronic control P.C. board and power board for more than 0 seconds. The communication between boards protection stop is continuously performed twice. Correspondence Check the connecting wire between outdoor electronic control P.C. board and power board. Indoor/outdoor unit failure mode recall function Current sensor Zero cross detecting circuit Converter Lighting 7 times 5 times oes out 5 times oes out A short or open circuit is detected in the current sensor during compressor operating. Current sensor protection stop is continuously performed twice. Zero cross signal cannot be detected while the compressor is operating. The protection stop of the zero cross detecting circuit is continuously performed 0 times. A failure is detected in the operation of the converter during operation. Replace the power board. Check the connecting wire among electronic control P.C. board, noise filter P.C. board and power board. Replace the power board. Bus-bar voltage () Bus-bar voltage (2) weven if this protection stop is performed continuously 3 times, it does not mean the abnormality in outdoor power system. 5 times 6 times oes out oes out The bus-bar voltage exceeds 400V or falls to 200V or below during compressor operating. The bus-bar voltage exceeds 400V or falls to 50V or below during compressor operating. NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (-4.). 3

32 -3. INSTRUCTION OF TROUBLESHOOTIN 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 8-3.) Outdoor unit doesn't operate even in Test Run operation. (Refer to 8-3.) 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.E "How to check inverter/ compressor". Refer to -6.C "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.) 2. Refer to "Check of indoor electronic control P.C. board and indoor fan motor". Refer to indoor unit service manual. Left lamp Flash on and off at 0.5-second intervals Cause: Indoor/ Outdoor unit Mis-wiring or trouble of serial signal. Left lamp 2-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 -6.B "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.E "How to check inverter/ compressor". Refer to -6.F "Check of outdoor thermistors". Replace inverter P.C. board or outdoor electronic control P.C. board. Check "Flow chart of the detailed outdoor unit failure mode recall function." 32

33 -4. TROUBLESHOOTIN CHECK TABLE. Symptom Outdoor unit does not operate. Indication LED(Red) LED2(Yellow) Abnormal point / Condition Lightning Twice Outdoor power system Condition Overcurrent protection stop is continuously performed 3 times within minute after the compressor gets started, or when converter protection stop or bus-bar voltage protection stop is continuously performed 3 times within 3 minutes after start-up. Correspondence Check the connection of the compressor connecting wire. Refer to -6.E "How to check inverter/compressor". Check the stop valve. 2 Lightning 3 times Discharge temperature thermistor A short circuit is detected in the thermistor during operation, or an open circuit is detected in the thermistor after 0 minutes of compressor start-up. Refer to -6.F "Check of outdoor thirmistor". 3 Lightning 4 times Fin temperature thermistor P.C board temperature thermistor Ambient temperature thermistor A short or open circuit is detected in the thermistor during operation. A short or open circuit is detected in the thermistor during operation. Refer to -6.F "Check of outdoor thirmistor". Replace the outdoor electronic control P.C. board. 4 Lightning 5 times Outdoor heat exchanger temperature thermistor A short circuit is detected in the thermistor during operation, or an open circuit is detected in the thermistor after 5 minutes (in cooling) and 0 minutes (in heating) of compressor start-up. Refer to -6.F "Check of outdoor thirmistor". Defrost thermistor A short circuit is detected in the thermistor during operation, or an open circuit is detected in the thermistor after 5 minutes of compressor start-up. 5 Lightning 6 times Serial signal The communication fails between the indoor and outdoor unit for 3 minutes. Refer to -6.B "How to check mis-wiring and serial signal error" 'Outdoor unit stops and restarts 3 minutes later' is repeated. Lightning 7 times nvolatile memory data The nonvolatile memory data cannot be read properly. Replace the outdoor electronic control P.C. board. Lightning 8 times Current sensor Current sensor protection stop is continuously performed twice. Replace the power board. Lightning Lightning Twice times 2 times oes out Communication error between P.C. boards Zero cross detecting circuit IPM protection Lock protection The communication protection stop between boards is continuously performed twice. The protection stop of the zero cross detecting circuit is continuously performed 0 times. Overcurrent is detected after 30 minutes of compressor start-up. Overcurrent is detected within 30 minutes of compressor start-up Check the connecting wire between outdoor electronic control P.C. board and power board. Check the connecting wire among outdoor electronic control P.C. board, noise filter P.C. board and power board. Reconnect compressor connector. Refer to -6.E "How to check inverter/compressor". Check the stop valve. Check the power module (PAM module) times oes out 4 times oes out 5 times oes out Discharge temperature protection Fin temperature protection P.C. board temperature protection High-pressure protection Discharge temperature exceeds 6:during operation and compressor stops. Compressor can restart if discharge temperature thermistor reads 00: or less 3 minutes later. The fin temperature exceeds 87: during operation. The P.C. board temperature exceeds 70: during operation. High-pressure is detected with the high-pressure switch (HPS) during operation. The outdoor heat exchanger temperature exceeds 70: during cooling or indoor gas pipe temperature exceeds 70: during heating. Check the amount of gas and refrigerant circuit. Refer to -6.D "Check of LEV". Check refrigerant circuit and refrigerant amount. Refer to -6. "Check of outdoor fan motor". Check the amount of gas and the refrigerant circuit. Check stop valve times oes out 9 times oes out Lighting 2 times Converter protection Bus-bar voltage protection () Bus-bar voltage protection (2) Communication between P.C. boards protection Zero cross detecting circuit protection A failure is detected in the operation of the converter during operation. The bus-bar voltage exceeds 400V or falls to 200V or below during compressor operating. The bus-bar voltage exceeds 400V or falls to 50V or below during compressor operating. Replace the power board. Replace the power board. 3 times oes out Outdoor fan motor Failure occurs continuously 3 times within 30 seconds after the fan gets started. Refer to -6. "Check of outdoor fan motor". Lighting 8 times Current sensor protection A short or open circuit is detected in the current sensor during compressor operating. Replace the power board. Lighting times Communication error occurs between the outdoor electronic control P.C. board and power board for more than 0 seconds. Zero cross signal cannot be detected while the compressor is operating. Check the connecting wire between outdoor electronic control P.C. board and power board. Check the connecting wire among outdoor electronic control P.C. board, noise filter P.C. board and power board. NOTE. The location of LED is illustrated at the right figure. Refer to LED is lighted during normal operation. The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF. (Example) When the flashing frequency is second ON Outdoor electronic control P.C. board(parts side) LED2 LED Lighting 0.5-second ON ON OFF 2.5-second OFF 2.5-second OFF 33

34 Symptom Outdoor unit operates. Indication LED(Red) LED2(Yellow) Abnormal point / Condition Once Twice Lighting Lighting Primary current protection Secondary current protection High-pressure protection Defrosting in cooling Condition The input current exceeds 5A. The current of the compressor exceeds 5A. The indoor gas pipe temperature exceeds 45: during heating. The indoor gas pipe temperature falls 3: or below during cooling. Correspondence These symptoms do not mean any abnormality of the product, but check the following points. Check if indoor filters are clogged. Check if refrigerant is short. Check if indoor/outdoor unit air circulation is short cycled times Lighting Discharge temperature protection The discharge temperature exceeds 00: during operation. Check refrigerant circuit and refrigerant amount. Refer to -6.D "Check of LEV". Refer to -6.F "Check of outdoor thermistors" times Lighting Low discharge temperature protection The frequency of the compressor is kept 80Hz or more and the discharge temperature is kept under 39: for more than 20 minutes. Refer to -6.D "Check of LEV". Check refrigerant circuit and refrigerant amount times Lighting Cooling high-pressure protection The outdoor heat exchanger temperature exceeds 58: during operation. This symptom does not mean any abnormality of the product, but check the following points. Check if indoor filters are clogged. Check if refrigerant is short. Check if indoor/outdoor unit air circulation is short cycled. 25 Outdoor unit operates 9 times Lighting Inverter check mode The unit is operated with emergency operation switch Lighting Lighting rmal

35 -5. TROUBLE CRITERION OF MAIN PARTS MUZ-A50VA MUZ-A60VA MUZ-A7VA Part name Defrost thermistor (RT6) Ambient temperature thermistor (RT65) Outdoor heat exchanger temperature thermistor (RT68) Measure the resistance with a tester. Check method and criterion Refer to -7. Test point diagram and voltage,. Outdoor electronic control P.C. board, the chart of thermistor. Figure Discharge temperature thermistor (RT62) Fin temperature thermistor (RT64) Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. Refer to -7. Test point diagram and voltage,. Outdoor electronic control P.C. board, the chart of thermistor. Compressor Measure the resistance between terminals using a tester. (Winding temperature : -0 C ~ 40 C) A50/60VA 0.40 Ω ~ 0.49 Ω rmal A60VA- E Ω ~.06 Ω A7VA.29 Ω ~.49 Ω V WHT W RED U Measure the resistance between lead wires using a tester. (Part temperature : -0 C ~ 40 C) Outdoor fan motor Color of lead wire RED - - WHT WHT - RED rmal 3.4 Ω ~ 6.4 Ω RED U (W) WHT V (V) W (U) Measure the resistance using a tester. (Part temperature : -0 C ~ 40 C) R. V. coil MUZ-A60VA- E3.32 kω ~.62 kω rmal Other models 2.6 kω ~ 3.3 kω Linear expansion valve Measure the resistance using a tester.(part temperature : -0 C ~ 40 C) Color of lead wire WHT - RED RED - ORN YLW - BRN BRN - BLU rmal 37.4 Ω ~ 53.9 Ω WHT RED ORN LEV YLW BRN BLU High pressure switch (HPS) MUZ-A60VA- E3 MUZ-A7VA Pressure 3.7 ± 0.5 MPa Close MPa Open 35

36 -6. TROUBLESHOOTIN FLOW Outdoor unit does not operate. A Check of power supply Check the connecting of parts of main power supply circuit. Turn ON power supply. Is there voltage of 230V AC in the power supply terminal block? Check the power supply cable. Is the output voltage from the noise filter P.C. board 230V AC? Is fuse (F64) blown? Replace the noise filter P.C. board. Replace the fuse. Is the input voltage to the power board 230V AC? Replace the reactor. Is the input voltage to the outdoor electronic control P.C. board 325V DC? Replace the power board. Replace the outdoor electronic control P.C. board. 36

37 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 every 0.5-second. Outdoor unit doesn t operate. B 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 S2? 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 B Turn OFF the power supply. Check once more if the indoor/outdoor connecting wire is not mis-wiring. Short-circuit outdoor terminal block S2 and S3. 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. W3.Be sure to check this within 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. Even when the inverter P.C.board or the outdoor electronic control P.C.board is normal, LED blinks 6 times after 3 minutes. Outdoor electronic control P.C. board (Parts side) Lighted 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 LED2 LED 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 or the outdoor electronic control P.C.board repeat "3.6-second-OFF and 0.8-second-ON quick blinking"? W3 Turn OFF the power supply. Remove the short-circuit between outdoor terminal block S2 and S3. Turn ON the power supply. Is there amplitude of 0 to 20V DC between outdoor terminal block S2 and S3? <Confirmation of serial signal> Is there rated voltage between indoor terminal block S and S2? <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. W2 W2 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. 37

38 The cooling operation or heating operation does not operate. C Check of R.V. coil When heating operation does not work.. Disconnect the lead wire leading to the compressor minutes after turning ON the power supply, start EMERENCY OPERATION in HEAT mode. Is there voltage of 230V AC between pin and pin 2 at connector CN92? W Turn OFF power supply of indoor and outdoor unit.. Turn OFF power supply of indoor and outdoor unit, and disconnect the connector CN78 in the outdoor electronic control P.C. board minutes after turning ON the power supply, start EMERENCY OPERATION in HEAT mode. Disconnect the connector CN92 in noise filter P. C. board. Is there normal resistance to R.V. coil? Replace the 4-way valve. Replace the R.V. coil. Is there voltage 2V DC between the connector CN78 pin 5 (+) and pin 3 (-)? Replace the noise filter P.C. board. Replace the electronic control P.C. board. When cooling operation does not work.. Disconnect the lead wire leading to the compressor minutes after turning ON the power supply, start EMERENCY OPERATION in COOL mode. Is there voltage of 230V AC between pin and pin 2 at connector CN92? W Replace the 4-way valve. W If the connector CN92 is not connected or R.V. coil is open, voltage occurs between terminals even when the control is OFF.. Turn OFF power supply of indoor and outdoor unit, and disconnect the connector CN78 in the outdoor electronic control P.C. board minutes after turning ON the power supply, start EMERENCY OPERATION in COOL mode. Is there voltage 2V DC between the connector CN78 pin 5 (+) and pin 3 (-)? Replace the noise filter P.C. board. Replace the outdoor electronic control P.C. board. 38

39 When cooling, heat exchanger of non-operating indoor unit frosts. When heating, non-operating indoor unit gets warm. D Check of LEV Turn ON power supply to the outdoor unit after checking LEV coil is mounted to the LEV body securely. Is "click - click" sound heard? Or, do you feel vibration of the LEV coil with hands? Disconnect the connector CN795. Is there normal resistance to LEV coil? Replace the LEV coil. rmal Replace the outdoor electronic control P.C. board. When OPERATION INDICATOR lamp flashes 5-time. When heating, room does not get warm. When cooling, room does not get cool. E How to check inverter/ compressor Disconnect the terminal of the compressor. 3 minutes after turning ON the power supply, start EMERENCY OPERATION. Measure the voltage between each lead wire leading to the compressor. U () - V (WHT) V (WHT) - W (RED) W (RED) - U () Is there output voltage? Is output balanced? W After the outdoor fan starts running, wait for minute or more before measuring the voltage. The output voltage values have the tolerance of i20%. Is the input voltage to the outdoor electronic control P.C. board 370V or more? Replace the power board. Turn OFF power supply of indoor and outdoor unit, and measure the compressor winding resistance between the compressor terminals. Is the resistance between each terminal normal? Reconnect the lead wire of compressor, and turn ON power supply to indoor and outdoor unit. 3 minutes later, start EMERENCY OPERATION. Replace the compressor. Clarify the causes by counting time until the inverter stops. 0 to 0 seconds: compressor rare short 0 to 60 seconds: compressor lock 60 seconds to 5minutes: refrigerant circuit defective 5 minutes or more: normal 39

40 When OPERATION INDICATOR lamp flashes 6-time. When thermistor is abnormal. F Check of outdoor thermistors Disconnect the connector in the outdoor electronic control P.C. board or the outdoor power board (see below table), and measure the resistance of thermistor. Is the thermistor normal? (Refer to -7..) Reconnect the connector CN66, CN663 and CN3. 3 minutes after turning ON the power supply, start EMERENCY OPERATION. Replace the thermistor.w W When RT64 is abnormal, replace the outdoor power board. Does the unit operate for 0 minutes or more without showing thermistor abnormality? rmal Replace the outdoor electronic control P.C. board. Thermistor Defrost Discharge temperature Outdoor heat exchanger temperature Ambient temperature Fin temperature Symbol RT6 RT62 RT68 RT65 RT64 Connector, Pin. Between CN66 pin and pin2 Between CN66 pin3 and pin4 Between CN66 pin7 and pin8 Between CN663 pin and pin2 Between CN3 pin and pin2 Board Outdoor electronic control P.C. board Outdoor power board Fan motor does not operate or stops operating shortly after starting the operation. Check of outdoor fan motor Check the connection between the connector CN93 and CN932. Is the resistance between each terminal of outdoor fan motor normal? Disconnect CN932 from outdoor electronic control P.C. board, and turn ON the power supply. Rotate the outdoor fan motor manually and measure the voltage of CN93. Between (+) and 5(-) Between 2(+) and 5(-) Between 3(+) and 5(-) (Fixed to either 5V or 0V DC) Replace the outdoor DC fan motor. Does the voltage between each terminal become 5V DC and 0V DC repeatedly? Does the outdoor fan motor rotate smoothly? Replace the outdoor electronic control P.C. board. 40

41 When the operation frequency does not go up from lowest frequency. H Check of HPS MUZ-A60VA- MUZ-A7VA E3. Disconnect the connector CN68 in the electronic control P.C. board. 2. Check the resistance of HPS minute after the outdoor unit power supply was turned OFF. Check the resistance between each terminal. 0" Infinity Replace HPS. Reconnect CN68. Turn ON power supply to the indoor and outdoor unit. 3 minutes later, start EMERENCY OPERATION. Is HPS protection displayed immediately after compressor starts? rmal Replace the electronic control P.C. board. 4

42 I 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, 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 3m? 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) 2.Channel, frequency, broadcast station affected by the electromagnetic noise 3.Channel, frequency, broadcast station unaffected by the electromagnetic noise 4.Layout of ; indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, earth 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. 2)Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for power ON, and check for the electromagnetic noise. 3)After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the 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. 42

43 :08 PM Page TEST POINT DIARAM AND VOLTAE. Outdoor electronic control P.C. board Defrost thermistor (RT6) Ambient temperature thermistor (RT65) Fin temperature thermistor (RT64) Outdoor heat exchanger temperature thermistor (RT68) MUZ-A60VA MUZ-A7VA Temperature (;) ( ( ( ) ( (+) ( ) (+) (+) ( ) (+) ( ( ( ( ( 5V DC pulse wave 5V ND CN93 ( CN V AC Temperature (;) ( To fan motor Temperature (;) LEV 50 0 CN78 40 Outdoor heat exchanger temperature thermistor (RT68) 30 ( 20 ( ( 0 Defrost thermistor (RT6) Discharge temperature thermistor (RT62) ( V DC Ambient temperature CN663 thermistor (RT65) CN70 Signal transmission (To power board) 5V DC pulse wave CN795 2V DC pulse wave Resistance (k') 600 Resistance (k') 80 CN66 Resistance (k') Discharge temperature thermistor (RT62) 700 ND (power board) ( )Rush current relay ( )R.V. coil MUZ-A50VA CN702 ND Signal reception (From power board) 5V 5V DC pulse wave 5V OB389F--2qxp LED LED 2 CN80 325V DC ~ 370V DC Input F80 FUSE 250V 3.5A ( ( CN68 High pressure switch MUZ-A60VA- E3 MUZ-A7VA V AC Input ( CN60 Serial signal Room A 5~0V DC

44 2. ise filter P.C. board MUZ-A50VA MUZ-A60VA MUZ-A7VA CN90 To electronic control P.C. board CN902 To power board CN903 To power board { { 230V AC Input CN92 R.V. coil 230V AC { 230V AC Output { 230V AC Output NR64 VARISTOR F64 FUSE 250V 2A F9 FUSE 250V A 44

45 3. Outdoor power board MUZ-A50VA MUZ-A60VA MUZ-A7VA Connect to the compressor Voltage among phases: 5V to 80V V DC Output (Red) (+) ( ) 3 (White) Connect to the earth CN2 Connect to the controller board (+)-5( ): Signal transmission (To electronic control P.C. board) 5V DC pulse wave (+)2-5( ): Zero cross signal 3-4 : t used (+)6-5( ): 5V (+)7-5( ): 5V CN3 Fin temperature thermistor RT64 ) Signal reception (From electronic control P.C. board) 5V DC pulse wave CN5 Primary current detection (Connect to the noise filter) Connect to the compressor Voltage among phases: 5V to 80V Connect to the earth V DC Output (Red) (+) ( ) 3 (White) CN2 Connect to the controller board (+)-5( ): Signal transmission (To electronic control P.C. board) 5V DC pulse wave (+)2-5( ): Zero cross signal 3-4 : t used (+)6-5( ): 5V (+)7-5( ): 5V CN3 Fin temperature thermistor RT64 ) Signal reception (From electronic control P.C. board) 5V DC pulse wave CN5 Primary current detection (Connect to the noise filter) 45

46 2 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 (2)) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. () Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the locking mechanism. Sleeve Locking lever Slide the sleeve. 2Pull the terminal while pushing the locking lever. Connector Hold the sleeve, and pull out the terminal slowly. MUZ-A50VA MUZ-A60VA MUZ-A7VA OPERATIN PROCEDURE. Removing the cabinet () Remove the screws of the service panel. (2) Remove the screws of the top panel. (3) Remove the screw of the valve cover. (4) Remove the service panel. (5) Remove the top panel. (6) Remove the valve cover. (7) Disconnect the power supply and indoor/ outdoor connecting wire. (8) Remove the screws of the cabinet. (9) Remove the cabinet. (0) Remove the screws of the back panel. () Remove the back panel. Photo Screws of the cabinet NOTE : These photos are MUZ-A7VA. Other models are almost the same as MUZ-A7VA. PHOTOS Screw of the top panel Photo 3 Screw of the motor support Photo 2 Screws of the cabinet Screw of the service panel Screws of the back panel Screws of the cabinet Screws of the top panel Set screws of the back panel Screw of the valve cover 46

47 OPERATIN PROCEDURE 2. Removing the inverter assembly, inverter P.C. board and power board () Remove the top panel, cabinet and service panel. (Refer to.) (2) Remove the back panel.(refer to.) (3) Disconnect the following connectors; <Electronic control P.C. board> CN93 and CN932 (Fan motor) CN795 (LEV) CN66 (Discharge temperature thermistor, defrost thermistor and outdoor heat exchanger temperature thermistor) CN663 (Ambient temperature thermistor) CN68 (High pressure switch) (A60VA- E3, A7VA) <ise filter P.C. board> CN92 (R.V coil) (4) Remove the compressor connector. (5) Remove the screws fixing the relay panel. (6) Remove the inverter assembly. (7) Disconnect all connectors and lead wires on the electronic control P.C. board. (8) Remove the electronic control P.C. board from the inverter assembly. (9) Remove the screws fixing the power board assembly. (0) Disconnect all connectors and lead wires on the power board. () Remove the power board from the inverter assembly. (2) Disconnect all connectors and lead wires on the noise filter P.C. board. (3) Remove the noise filter P.C. board from the inverter assembly. PHOTOS Photo 4 Screws of the power board assembly Screws of the relay panel 3. Removing R.V. coil () Remove the top panel, cabinet and service panel. (Refer to.) (2) Remove the back panel. (Refer to.) (3) Disconnect the following connectors; <ise filter P.C. board> CN92 (R.V coil) (4) Remove the R.V. coil. (Photo 9) 47

48 OPERATIN PROCEDURE 4. Removing the defrost thermistor, discharge temperature thermistor, outdoor heat exchanger temperature thermistor and ambient temperature thermistor () Remove the top panel, cabinet and service panel. (Refer to.) (2) Remove the back panel. (Refer to.) (3) Disconnect the following connectors; <Electronic control P.C. board> CN66 (Discharge temperature thermistor, defrost thermistor and outdoor heat exchanger temperature thermistor) CN663 (Ambient temperature thermistor) (4) Pull out the defrost thermistor from its holder. (Photo 6) (5) Pull out the discharge temperature thermistor from its holder. (Photo 5) (6) Pull out the outdoor heat exchanger temperature thermistor from its holder. (Photo 6) (7) Pull out the ambient temperature thermistor from its holder. (Photo 6) Photo 5 Photo 6 PHOTOS Discharge temperature thermistor Outdoor heat exchanger temperature thermistor Ambient temperature thermistor Defrost thermistor 5. Removing outdoor fan motor () Remove the top panel, cabinet and service panel. (Refer to.) (2) Remove the back panel. (Refer to.) (3) Disconnect the following connectors; <Electronic control P.C. board> CN93 and CN932 (Fan motor) (4) Remove the propeller. (5) Remove the screws fixing the fan motor. (6) Remove the fan motor. Photo 7 Propeller Screws of the outdoor fan motor 48

49 OPERATIN PROCEDURE 6. Removing the compressor and 4-way valve () Remove the top panel, cabinet and service panel. (Refer to.) (2) Remove the back panel. (Refer to.) (3) Remove the inverter assembly. (Refer to 2.) (4) Recover gas from the refrigerant circuit. NOTE: Recover gas from the pipes until the pressure gauge shows 0 kg/cm 2 (0 MPa). (5) Detach the welded part of the suction and the discharge pipe connected with compressor. (Photo 9) (6) Remove the compressor nuts. (7) Remove the compressor. (8) Detach the welded part of 4-way valve and pipe. (Photo 8) Photo 8 PHOTOS Welded parts of 4-way valve Photo 9 R.V. coil Welded part of the discharge pipe Welded part of the suction pipe 7. Removing the reactor () Remove the top panel. (Refer to.) (2) Disconnect the reactor lead wire. (3) Remove the screws of the reactor, and remove the reactor. Photo 0 Screws of the reactor 49