SERVICE MANUAL MU-A09YV - E1 MU-A09YV - MU-A12YV - E1 HFC. Wireless type Models SPLIT-TYPE, AIR CONDITIONERS. No. OB330 R410A CONTENTS.

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1 SPLIT-TYPE, AIR CONDITIONERS Revision A: MU-A2YV - E can be connected to MCF-A2WV - E. Please void OB330. SERVICE MANUAL Wireless type Models E MU-A07YV - E MU-A09YV - MU-A2YV - E HFC utilized R40A No. OB330 REVISED EDITION-A CONTENTS Indication of model name MU-A07YV - E MU-A09YV - E MU-A2YV - E. TECHNICAL CHANGES 2 2. PART NAMES AND FUNCTIONS 5 3. SPECIFICATION 5 4. NOISE CRITERIA CURVES 6 5. OUTLINES AND DIMENSIONS 7 6. WIRING DIAGRAM 7 7. REFRIGERANT SYSTEM DIAGRAM 8 8. PERFORMANCE CURVES 9 9. TROUBLESHOOTING DISASSEMBLY INSTRUCTIONS 23. PARTS LIST 26 NOTE: This service manual describes technical data of outdoor units. As for indoor units MSC-A07YV - E, MSC-A09YV - E and MSC-A2YV - E, refer to the service manual OB329. As for indoor unit MCF-A2WV - E, refer to the service manual OB338.

2 Revision A: MU-A2YV - E can be connected to MCF-A2WV - E. SPECIFICATION and PERFORMANCE CURVES have been added. TECHNICAL CHANGES MU-A07WV- MU-A09WV-. Outdoor heat exchanger has changed. 2. Outdoor fan motor has changed. (RA6V23-FC RC6V20-AC) MU-A2WV- E E E MU-A07YV- MU-A09YV- MU-A2YV-. Outdoor heat exchanger has changed. 2. Outdoor fan motor has changed. (RA6V33-DC RA6V33-FC) E E E INFORMATION FOR THE AIR CONDITIONER WITH R40A REFRIGERANT This room air conditioner adopts an 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 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. Refrigerating Refrigerant oil New refrigerant Refrigerant R40A Composition (Ratio) HFC-32: HFC-25 (50%:50%) Refrigerant handling Pseudo-azeotropic refrigerant Chlorine Not 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 Non combustible ODP w 0 GWP w2 730 Refrigerant charge method From liquid phase in cylinder Additional charge on leakage Possible Kind Incompatible oil Color Non Smell Non w :Ozone Destruction Parameter : based on CFC- w2 :Global Warmth Parameter : based on CO 2 Previous refrigerant R22 R22 (00%) Single refrigerant Included A Non combustible Gas phase Possible Compatible oil Light yellow Non 2

3 Compressor New Specification Current Specification The incompatible refrigerating 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 refrigerating oil are compatible each, refrigerating oil backs to the compressor through the lower position oil back hole. refrigerating oil of the upper layer to flow back to the compressor. Suction muffler Suction muffler Compressor Oil back hole Refrigerating oil Compressor Oil back hole Refrigerant Refrigerating 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]) =0.2(kgf/f [Gauge]) Conversion chart of refrigerant temperature and pressure (MPa [Gauge]) 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 [Gauge]) =0.2(kgf/f [Gauge]) (:).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 Gauge manifold No gauges. Port diameters have been changed to prevent any other refrigerant from being charged into the unit. Charge hose Gas leak detector No No Hose material and cap size have been changed to improve the pressure resistance. Dedicated for HFC refrigerant. Torque wrench Yes 6.35 mm and 9.52 mm No 2.7 mm Flare tool Flare gauge Yes 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 No : Not Substitutable for R40A Yes : Substitutable for R40A 3

4 2.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. 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 FLARING WORK. Pipe diameter Dimension of flare nut mm R40A 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 refrigerating 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. R Union Stop valve Indoor unit Liquid pipe Gas pipe Outdoor unit Refrigerant gas cylinder operating valve Service port Gauge manifold valve (for R40A) Charge hose (for R40A) Refrigerant gas cylinder for R40A with siphon Refrigerant (liquid) Electronic scale for refrigerant charging 4

5 2 PART NAMES AND FUNCTIONS OUTDOOR UNIT MU-A07YV - E MU-A09YV - E MU-A2YV - E Air inlet (back and side) Piping Drain hose Air outlet Drain outlet 3 SPECIFICATION Capacity Electrical data Capacity Dehumidification Outdoor air flow Power outlet Running current Power input Auxiliary heater Power factor Starting current Compressor motor current Fan motor current kw R/h K /h A A W A(kW) % A A A Coefficient of performance(c.o.p) Model Output W Winding " resistance(at 20:) Model Winding " resistance(at 20:) Dimensions WOHOD mm Weight kg Sound level db Fan speed rpm Fan speed regulator Refrigerant filling kg capacity (R40A) Refrigerating oil (Model) cc Compressor Fan motor Special remarks Outdoor model Outdoor unit power supply MU-A07YV - E Single phase 230V,50Hz , RN092VHSHT 600 C-R 3.87 C-S 6.4 RC6V20-AC WHT-BLK 40 BLK-RED o540o (NEO22 ) MU-A09YV - E Single phase 230V,50Hz 2.55., RN099VHSHT 700 C-R 3.40 C-S 4.56 RC6V20-AC WHT-BLK 40 BLK-RED o540o (NEO22 ) MU-A2YV - E Indoor unit MSC-A2YV - E Single phase 230V,50Hz 3.5.7, , RN35VHSHT 900 C-R 2.79 C-S 3.36 RA6V33-FC WHT-BLK 223 BLK-RED o540o (NEO22) MU-A2YV - E Indoor unit MCF-A2WV - E Single phase 230V,50Hz 3.5.5, , RN35VHSHT 900 C-R 2.79 C-S 3.36 RA6V33-FC WHT-BLK 223 BLK-RED o540o (NEO22) NOTE: Test conditions are based on ISO 55. Cooling : Indoor DB27 C WB9 C Outdoor DB35 C WB24 C Indoor-Outdoor piping length : 5m 5

6 4 NOISE CRITERIA CURVES MU-A07YV- E MU-A09YV- E FUNCTION COOL SPL(dB(A)) 45 LINE MU-A2YV- E FUNCTION COOL SPL(dB(A)) 49 LINE 90 Test conditions, Cooling : DB27: WB9: 90 Test conditions, Cooling :DB35: WB24: OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC-70 NC-60 NC-50 NC-40 NC-30 NC-20 OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC-70 NC-60 NC-50 NC-40 NC-30 NC-20 BAND CENTER FREQUENCIES, Hz BAND CENTER FREQUENCIES, Hz OUTDOORUNIT m MICROPHONE 6

7 5 OUTLINES AND DIMENSIONS MU-A07YV - E MU-A09YV - E MU-A2YV - E OUTDOOR UNIT 320 Air in REQUIRED SPACE 00mm or more 00mm or more 00mm or more Unit: mm Air in Drainage 3holes [ Air out 400mm or more 350mm or more Service panel 540 Liquid refrigerant pipe joint Refrigerant pipe (flared) [ Gas refrigerant pipe joint Refrigerant pipe (flared) [9.52 (MU-A07/A09YV) [2.7 (MU-A2YV) 6 WIRING DIAGRAM MU-A07YV - E MU-A09YV - E MU-A2YV - E OUTDOOR UNIT TO INDOOR UNIT CONNECTING 2V CIRCUIT BREAKER POWER SUPPLY ~/N 230V 50Hz MODELS WIRING DIAGRAM PE TB2 2 TB L N WHT BLK BRN BLU GRN/YLW 52C 52C NO COM BRN WHT WHT C2 DSAR C WHT BLU RED 2 3 RED S BLK WHT BLK RED C MC MF R SYMBOL NAME SYMBOL NAME SYMBOL NAME C COMPRESSOR CAPACITOR MC COMPRESSOR(INNER PROTECTOR) TB,TB2 TERMINAL BLOCK C2 OUTDOOR FAN CAPACITOR OUTDOOR FAN MOTOR 52C COMPRESSOR CONTACTOR MF DSAR SURGE ABSORBER (INNER FUSE/INNER PROTECTOR) NOTE:. 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 7

8 7 REFRIGERANT SYSTEM DIAGRAM MU-A07YV - E MU-A09YV - E Unit:mm OUTDOOR UNIT Refrigerant pipe [9.52 (with heat insulator) Stop valve (with service port) Muffler Flared connection Outdoor heat exchanger Compressor Flared connection Strainer #00 Refrigerant pipe [6.35 (with heat insulator) Capillary tube [3.0x[.4x900 Refrigerant flow in cooling MU-A2YV - E OUTDOOR UNIT Refrigerant pipe [2.7 (with heat insulator) Unit:mm Flared connection Stop valve (with service port) Muffler Outdoor heat exchanger Compressor Flared connection Stop valve Strainer #00 Refrigerant pipe [6.35 (with heat insulator) Capillary tube [3.0x[.4x550 Refrigerant flow in cooling 8

9 MAX. REFRIGERANT PIPING LENGTH Refrigerant piping Model Max. length : m A MU-A07YV - E 20 MU-A09YV - E MU-A2YV - E 25 Piping size O.D : mm Gas Liquid Length of connecting pipe : m Indoor unit Outdoor unit Gas 0.43 Gas 0 Liquid 0.5 Liquid 0 MAX. HEIGHT DIFFERENCE Indoor unit Height difference should be within 0m regardless of which unit, indoor or outdoor position is high. w Max. Height difference 0m Refrigerant Piping Max.length A Outdoor unit ADDITIONAL REFRIGERANT CHARGE(R40A : g) Model Outdoor unit precharged 7m Refrigerant piping length (one way) 0m 5m 20m 25m MU-A07YV - E MU-A09YV - E MU-A2YV - E PERFORMANCE CURVES Calculation : Xg=20g/m x(a-7)m MU-A07YV - E MU-A09YV - E MU-A2YV - 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 98~264V (2) AIR FLOW Air flow should be set at MAX. (3) MAIN READINGS () Indoor intake air wet-bulb temperature : CWB } (2) Indoor outlet air wet-bulb temperature : CWB Cooling (3) Outdoor intake air dry-bulb temperature : CDB (4) 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. 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 EMERGENCY OPERATION switch once to start the EMERGENCY COOL 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. 9

10 INDOOR UNIT OUTDOOR UNIT Wet-and dry-bulb thermometers Wet-and dry-bulb thermometers 8-.CAPACITY AND THE INPUT CURVES MSC-A07YV - E MU-A07YV - E MSC-A09YV - E MU-A09YV - E MSC-A2YV - E MU-A2YV - E MCF-A2WV - E MU-A2YV - E 8-2.OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOL operation Both indoor and outdoor unit are under the same temperature/humidity condition. Dry-bulb temperature Relative humidity(%) ➁ Air flow should be set at MAX. 3 The unit of pressure has been changed to MPa on the international system of units(si unit system). The conversion factor is : (MPa[Gauge]) =0.2(kgf/f[Gauge] ) (kgf/f[gauge])(mpa[gauge]) MU-A07YV - E V Outdoor low pressure Outdoor unit current (A) 3 2 MU-A07YV - E 230V (:) (%) Ambient temperature( C) Ambient humidity(%) (%) 35(:) Ambient temperature( C) Ambient humidity(%)

11 (kgf/f[gauge])(mpa[gauge]) Outdoor low pressure MU-A09YV - E V (:) (%) Ambient temperature( C) Ambient humidity(%) Outdoor unit current (A) 4 MU-A09YV - E 230V (%) 35(:) Ambient temperature( C) Ambient humidity(%) (kgf/f[gauge])(mpa[gauge]) 3.3 Outdoor low pressure MU-A2YV - E MU-A2YV - E (Indoor unit : MSC-A2YV - E ) (Indoor unit : MSC-A2YV - E ) 230V Outdoor unit current (A) V (:) (%) Ambient temperature( C) Ambient humidity(%) (:) (%) Ambient temperature( C) Ambient humidity(%) (kgf/f[gauge])(mpa[gauge]) Outdoor low pressure MU-A2YV - E MU-A2YV - E (Indoor unit : MCF-A2WV - E ) (Indoor unit : MCF-A2WV - E ) 230V Outdoor unit current (A) V (:) (%) Ambient temperature( C) Ambient humidity(%) (:) (%) Ambient temperature( C) Ambient humidity(%)

12 PERFORMANCE DATA COOL operation (230V) MSC-A07YV - E : MU-A07YV - E CAPACITY : 2.3(KW) SHF : 0.74 INPUT : 75(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 2

13 PERFORMANCE DATA COOL operation (230V) MSC-A07YV - E : MU-A07YV - E CAPACITY : 2.3(KW) SHF : 0.74 INPUT : 75(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

14 PERFORMANCE DATA COOL operation (230V) MSC-A09YV - E : MU-A09YV - E CAPACITY : 2.55(KW) SHF : 0.70 INPUT : 795(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 4

15 PERFORMANCE DATA COOL operation (230V) MSC-A09YV - E : MU-A09YV - E CAPACITY : 2.55(KW) SHF : 0.70 INPUT : 795(W) OUTDOOR DB(:) INDOOR DB(:) INDOOR 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 5

16 PERFORMANCE DATA COOL operation (230V) MSC-A2YV - E : MU-A2YV - E CAPACITY : 3.5(KW) SHF : 0.66 INPUT : 40(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q :Total capacity (kw) SHF :Sensible heat factor DB :Dry-bulb temperature SHC :Sensible heat capacity (kw) INPUT :Total power input (W) WB :Wet-bulb temperature 6

17 PERFORMANCE DATA COOL operation (230V) MSC-A2YV - E : MU-A2YV - E CAPACITY : 3.5(KW) SHF : 0.66 INPUT : 40(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q :Total capacity (kw) SHF :Sensible heat factor DB :Dry-bulb temperature SHC :Sensible heat capacity (kw) INPUT :Total power input (W) WB :Wet-bulb temperature 7

18 PERFORMANCE DATA COOL operation (230V) MCF-A2WV - E : MU-A2YV - E CAPACITY :3.5(KW) SHF :0.70 INPUT :60(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q :Total capacity (kw) SHF :Sensible heat factor DB :Dry-bulb temperature SHC :Sensible heat capacity (kw) INPUT :Total power input (W) WB :Wet-bulb temperature 8

19 PERFORMANCE DATA COOL operation (230V) MCF-A2WV - : MU-A2YV - E CAPACITY :3.5(KW) SHF :0.70 INPUT :60(W) OUTDOOR DB(:) INDOOR INDOOR DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q :Total capacity (kw) SHF :Sensible heat factor DB :Dry-bulb temperature SHC :Sensible heat capacity (kw) INPUT :Total power input (W) WB :Wet-bulb temperature 9

20 9 TROUBLESHOOTING MU-A07YV - E MU-A09YV - E MU-A2YV - E 9-. Cautions on troubleshooting. Before troubleshooting, check the following: ) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 2. Take care the following during servicing. ) Before servicing the air conditioner, be sure to first turn off the remote controller to stop the unit, and then after confirming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug. 2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board. 3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components. 4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. Lead wiring Housing point 20

21 9-2. Instruction of troubleshooting MU-A07YV - E MU-A09YV - E MU-A2YV - E 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. Outdoor unit doesn't stop even if indoor unit stops. Indoor unit operates, when the EMERGENCY OPERATION switch is pressed. Indoor unit doesn't operate, when the EMERGENCY OPERATION switch is pressed. Check room temperature thermistor. Refer to "Test point diagram and voltage". Check of wiring diagram of outdoor unit on page 7. Refer to "Check of remote controller and receiver P.C. board".. Check indoor / outdoor connecting wire. 2. Refer to "Check of indoor electronic control P.C. board". MSC type Flash on and off at 0.5-second intervals Cause: Wrong setting of switch (SW2-2) on the electronic control P.C. board. Refer to A "Check of MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER " (When outdoor unit doesn't operate.) on page time flash Cause: Indoor unit Trouble of room temperature/ indoor coil thermistor Check room temperature thermistor and indoor coil thermistor. Refer to "Test point diagram and voltage". MSC type 3-time flash Cause: Indoor unit Trouble of indoor fan motor Refer to "Check of indoor fan motor". MCF type 4-time flash Cause: Indoor unit Trouble of indoor unit control system Replace the indoor electronic control P.C. board. As for indoor unit MSC type, refer to service manual OB329. As for indoor unit MCF type, refer to service manual OB338. W.<The case of the trouble of the serial signal> When the power is turned off and then turned on again, the indication shows the trouble of mis-wiring. 2

22 9-3. Trouble criterion of main parts MU-A07YV - E MU-A09YV - E MU-A2YV - E Part name Compressor (MC) INNER PROTECTOR MU-A07/A09YV 50i 5 C OPEN 90i0 C CLOSE MU-A2YV 55i 5 C OPEN 90i0 C CLOSE Check method and criterion Measure the resistance between the terminals with a tester. (Coil wiring temperature 0 C ~ 40 C) Normal MU-A07YV MU-A09YV MU-A2YV C-R C-S 3.4~4.8Ω 5.4~6.63Ω 2.99~3.67Ω 4.02~4.92Ω 2.46~3.0Ω 2.96~3.63Ω Abnormal Open or short-circuit Figure WHT C P AUX. MAIN S R BLK RED Outdoor fan motor (MF) INNER PROTECTOR MU-A07/A09YV 30i 5 C OPEN 83i5 C CLOSE INNER FUSE MU-A2YV 45i 2 C CUT OFF Measure the resistance between the terminals with a tester. (Coil wiring temperature 0 C ~ 40 C) Color of lead wire WHT-BLK BLK-RED Normal MU-A07/A09YV MU-A2YV 36 ~ 443Ω 96 ~ 24Ω 38 ~ 468Ω 20 ~ 246Ω Abnormal Open or short-circuit MU-A07/A09YV MAIN AUX. P BLK REDWHT MU-A2YV MAIN AUX. FUSE BLK REDWHT P INNER PROTECTOR Indoor unit MSC type When OPERATION INDICATOR lamp flashes 0.5-second intervals. Outdoor unit doesn t operate. A Check of MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER Start Turn OFF the power supply (indoor / outdoor unit). Set switch (SW2-2) on the indoor electronic control P.C. board to MU type. w Yes Does the unit operate? No Refer to the "Instruction of troubleshooting." OK w Set the switch (SW2-2) on indoor electronic control P.C. board to MU type, when the outdoor unit is MU type. If the setting is MUH or MXZ type, the unit does not work. Refer to 9-4. MU & MUX TYPE / MUH& MXZ TYPE SWITCH OVER AND AUTO RESTART FUNCTION on service manual OB

23 0 DISASSEMBLY INSTRUCTIONS <"Terminal with lock mechanism" Detaching points> In case of terminal with lock mechanism, detach the terminal as shown below. There are two types ( Refer to () and (2)) of the terminal with lock mechanism. The terminal with no lock mechanism can be removed by pulling it out. Check the shape of the terminal and work. () Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector is a terminal with lock 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. MU-A07YV - E MU-A09YV - E MU-A2YV - OUTDOOR UNIT E OPERATING PROCEDURE. Removing the cabinet () Remove the screws of the top panel. (2) Remove the screw of the service panel. (3) Remove the screws of the cabinet. (4) Remove the screws of the front panel and motor support. (5) Remove the service panel, and remove the screw from the insides. (6) Remove the top panel. (7) Remove the cabinet. Photo PHOTOS Screws of the front panel and motor support Photo 3 Screws of the service panel Screws of the top panel Screws of the cabinet Screws of the cabinet Service panel Photo 2 Screws of the top panel Screws of the cabinet 23

24 OPERATING PROCEDURE PHOTOS 2. Removing the electrical parts () Remove the service panel and the cabinet.(refer to.) (2) Remove the following parts. Compressor capacitor (C) Outdoor fan capacitor (C2) Terminal block Photo 4 Relay panel Compressor capacitor Screws Contractor Terminal block Screw Outdoor fan capacitor 3. Removing the propeller and the outdoor fan motor () Remove the cabinet. (Refer to.) (2) Remove the propeller nut. (3) Remove the propeller. NOTE : Loose the propeller in the rotating direction for removal. When attaching the propeller, align the mark on the propeller and the motor shaft cut section. Set the propeller in position by using the cut on the shaft and the mark on the propeller. (4) Remove lead clamps and disconnect the outdoor fan motor connector. (5) Remove screws fixing the fan motor. (6) Remove the outdoor fan motor. Photo 5 Propeller nut Screws of the outdoor fan motor Hook Lead clamps Outdoor fan motor connector Propeller Screws of the outdoor fan motor Outdoor fan motor 24

25 OPERATING PROCEDURE 4. Removing the compressor () Remove the cabinet. (Refer to.) (2) Remove the relay panel. (3) Remove the soundproof felt. (4) Remove the terminal cover on the compressor. (5) Disconnect lead wires from the glass terminal of the compressor. (6) Recover gas from the refrigerant circuit. (7) Disconnect the welded part of the discharge pipe. (8) Disconnect the welded part of the suction pipe. (9) Remove nuts fixing the compressor. (0) Remove the compressor. NOTE Before using a burner, reclaim gas from the pipes until the pressure gauge shows 0 kg/cm 2 (0 MPa). Use the burner under the condition that gas can be recovered even when the inner pressure rises by heat. Photo 6 Glass terminal Compressor Discharge pipe PHOTOS Suction pipe Compressor set nuts Terminal cover 25