MUH-24RV - MSH-30RV -

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1 SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS SERVICE MANUAL Wireless type Models Refer to the Service Manual OB85 REVISED EDITION C when MSH-8RV- E is connected with MXZ-NV- E or MXZ-NV- E as multi system units. Refer to the Service Manual OB7 REVISED EDITION-B when MSH-8RV- E is connected with MXZ-RV- E as multi system units. Refer to the Service Manual OB54 when MSH- 8RV- E is connected with MXZ-SV- E as multi system units. E MSH-8RV - (WH) E MUH-8RV - E MSH-RV - (WH) E MUH-RV - MSH-RV - (WH) MUH-RV - E E. OB7 CONTENTS MSH-8RV - E MSH-RV - E. TECHNICAL CHANGES. PART NAMES AND FUNCTIONS. SPECIFICATION 6 4. NOISE CRITERIA CURVES 8 5. OUTLINES AND DIMENSIONS 0 6. WIRING DIAGRAM 7. REFRIGERANT SYSTEM DIAGRAM 7 8. PERFORMANCE CURVES 9. MICROPROCESSOR CONTROL 6 0. SERVICE FUNCTIONS 50. TROUBLESHOOTING 5. DISASSEMBLY INSTRUCTIONS 7. PARTS LIST OPTIONAL PARTS 88

2 TECHNICAL CHANGES MSH-8NV - E4 MSH-8RV - MSH-NV - E MSH-RV -. Remote controller has changed. SLEEP MODE function has removed. ECONO COOL operation has added. SWING button is removed, but SWING MODE function is available by VANE CONTROL button. MSH-RV - New model MUH-8NV - E4 MUH-8RV -. Outdoor model name has changed. MUH-NV - E MUH-RV -. Outdoor deicer P.C. board has changed.. Ball valve has changed to stop valve.. Thermostat has changed to ambient temperature thermistor. MUH-RV - New model E E E E E E PART NAMES AND FUNCTIONS INDOOR UNIT MSH-8RV - E MSH-RV - E Air cleaning filter (option) (White bellows type) Grille Air inlet MSH-RV - E Deodrizing filter (option) (Gray sponge type) Front panel Air filter Vertical vanes Operation section Emergency operation switch Remote control receiving section Horizontal vane Remote controller Display section the grille is open) MSH-8RV- E MSH-RV- E,(When MSH-8RV- MSH-RV- E E Operation indicator lamp Receiving section MSH-RV- E MSH-RV- E Operation indicator lamp Emergency operation switch Operation Indicator Receiving section

3 OUTDOOR UNIT MUH-8RV - E MUH-RV - E MUH-RV - E Air inlet (back and side) Piping Air inlet Air outlet Drainage hose Air outlet Drain outlet ACCESSORIES Indoor unit Installation plate Installation plate fixing screw 4 o 5 mm Remote controller mouting hardware 4 Fixing screw for o.5 o.6 mm (Black) 5 Battery (AAA) for remote controller 6 Wireless remote controller 7 Felt tape (Used for left or left-rear piping) Outdoor unit MSH-8RV- MSH-RV- 6 E E MSH-RV- E 7 MUH-8RV- E MUH-RV- E MUH-RV- E 8 9 Drain socket Drain cap { Drain cap {6 6

4 REMOTE CONTROLLER MSH-8RV - E MSH-RV - E Signal transmitting section Operation display section PM OPERATE /STOP (ON /OFF)button ON/OFF TOO WARM AM TOO COOL TEMPERATURE buttons Open the front lid. CLOCK PM AM ON/OFF TOO WARM TOO COOL VANE CONTROL button OPERATION SELECT button ECONO COOL button RESET button I FEEL COOL HEAT DRY MODE ECONO COOL FAN VANE RESET CLOCK STOP START HR. MIN. FAN SPEED CONTROL button OFF-TIMER button ON-TIMER button HR. button MIN. button (TIME SET button) CLOCK SET button 4

5 REMOTE CONTROLLER MSH-RV - E Signal transmitting section Operation display section PM OPERATE /STOP (ON /OFF)button ON/OFF TOO WARM AM TOO COOL TEMPERATURE buttons Open the front lid. CLOCK PM AM ON/OFF TOO WARM TOO COOL VANE button (Horizontal vane button) OPERATION SELECT button ECONO COOL button WIDE VANE button (Vertical vane button) I FEEL COOL HEAT DRY MODE ECONO COOL FAN VANE WIDE VANE LONG RESET CLOCK STOP START HR. MIN. FAN SPEED CONTROL button OFF-TIMER button ON-TIMER button HR. button MIN. button (TIME SET button) CLOCK SET button LONG button RESET button 5

6 SPECIFICATION wrefer to the Service Manual OB85 REVISED EDITION C when MSH-8RV- E is connected with MXZ-NVor E MXZ-NV- E as multi system units. Refer to the Service Manual OB7 REVISED EDITION-B when MSH-8RV- E is connected with MXZ-RVas E multi system units. Refer to the Service Manual OB54 when MSH-8RV- E is connected with MXZ-SV- E as multi system units. Capacity Electrical data Indoor model Function Power supply Capacity Dehumidification Air flow(high) Power outlet Running current Power input Auxiliary heater Power factor Starting current Fan motor current Coefficient of performance(c.o.p) Fan motor Special remarks Capacity Electrical data Compressor Fan motor Special remarks Model Winding resistance(at:) Dimensions WOHOD Weight Air direction Sound level (High) Fan speed (High) Fan speed regulator Thermistor RT(at5:) Thermistor RT(at5:) Outdoor model Air flow Compressor motor current Fan motor current Model Output Winding resistance(at:) Model Winding resistance(at:) Dimensions WOHOD Weight Sound level (High) Fan speed (High) Fan speed regulator Refrigerant filling capacity(r) Refrigerating oil (Model) Thermistor RT6(at0:) Thermistor RT6(at0:) kw r/h K /h A A W A(kW) % A A " mm kg db rpm k" k" K /h A A W " " mm kg db rpm kg cc k" k" NOTE:Test conditions are based on JIS C 96. Cooling : Indoor DB 7 C / WB 9 C Outdoor DB 5 C / (WB C) MSH-8RV - E Cooling Heating Single phase -0V, 50Hz ,0-, RA4V7-EF WHT-BLK 8.8 BLK-RED 50.5,05OO , MUH-8RV - E,4-, PH-6VPET,600 C-R.0 C-S.04 RA6V50-OG WHT-BLK 6.4 BLK-RED.0 850o605o ,980-, (MSN).8 6 w MSH-8RV - E Cooling Heating Single phase -0V, 50Hz RA4V7-EF WHT-BLK 8.8 BLK-RED 50.5,05OO , MUH-8RV - E Heating : Indoor DB C / WB 5.5 C Outdoor DB 7 C / WB 6 C MSH-RV - E Cooling Heating Single phase -0V, 50Hz ,7-, RA4V7-EE WHT-BLK 8. BLK-RED 50.5,05OO ,0 0 0 MUH-RV - E,640-, NH-47VMDT,0 C-R 0.96 C-S.07 RA6V85-AA WHT-BLK 6.7 BLK-YLW. YLW-RED o850o ,470-,580,0 (MSN).8.8

7 Capacity Electrical data Indoor model Function Power supply Capacity Dehumidification Air flow(high) Power outlet Running current Power input Auxiliary heater Power factor Starting current Fan motor current Coefficient of performance(c.o.p) Fan motor Special remarks Capacity Electrical data Compressor Fan motor Special remarks Model Winding resistance(at:) Dimensions WOHOD Weight Air direction Sound level (High) Fan speed (High) Fan speed regulator Thermistor RT(at5:) Thermistor RT(at5:) Thermistor RT(at5:) Outdoor model Air flow Compressor motor current Fan motor current Model Output Winding resistance(at:) Model Winding resistance(at:) Dimensions WOHOD Weight Sound level(high) Fan speed(high) Fan speed regulator Refrigerant filling capacity(r) Refrigerating oil (Model) Thermistor RT6(at0:) Thermistor RT6(at5:) Thermistor RT6(at0:) kw R/h K /h A A W A(kW) % A A " mm kg db rpm k" k" k" K /h A A W " " mm kg db rpm kg cc k" k" k" NOTE:Test conditions are based on JIS C 96. Cooling : Indoor DB 7 C / WB 9 C Outdoor DB 5 C / (WB C) Cooling ,0-,460 MSH-RV - E Single phase -0V, 50Hz RC4V40-AA WHT-BLK 8. BLK-RED 59.0,00O5O , MUH-RV - E,880-, NH-56VNHT,700 C-R 0.66 C-S.58 RA6V75-AA WHT-BLK 6.8 BLK-YLW 55.9 YLW-RED.0 870o850o ,0 (MSN) Heating : Indoor DB C / WB 5.5 C Outdoor DB 7 C / WB 6 C Heating ,5-,560 7

8 4 NOISE CRITERIA CURVES MSH-8RV- E MSH-RV- E NOTCH SPL(dB(A)) LINE NOTCH SPL(dB(A)) LINE High 4 High 45 OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR Test conditions, Cooling : Dry-bulb temperature 7: Wet-bulb temperature 9: Heating : Dry-bulb temperature : Wet-bulb temperature 5.5: APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-40 NC- NC- OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR Test conditions, Cooling : Dry-bulb temperature 7: Wet-bulb temperature 9: Heating : Dry-bulb temperature : Wet-bulb temperature 5.5: APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-40 NC- NC- MUH-8RV- E MUH-RV- E NOTCH SPL(dB(A)) LINE NOTCH SPL(dB(A)) LINE High 5 High 5 OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR Test conditions, Cooling : Dry-bulb temperature 5: Wet-bulb temperature : Heating : Dry-bulb temperature 7: Wet-bulb temperature 6: APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-40 NC- NC- 8 OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR Test conditions, Cooling : Dry-bulb temperature 5: Wet-bulb temperature : Heating : Dry-bulb temperature 7: Wet-bulb temperature 6: APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-40 NC- NC-

9 MSH-RV- E NOTCH SPL(dB(A)) LINE High 47 OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR Test conditions, Cooling : Dry-bulb temperature 7: Wet-bulb temperature 9: Heating : Dry-bulb temperature : Wet-bulb temperature 5.5: APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE MUH-RV- E BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-40 NC- NC- NOTCH SPL(dB(A)) LINE High 55 OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR Test conditions, Cooling : Dry-bulb temperature 5: Wet-bulb temperature : Heating : Dry-bulb temperature 7: Wet-bulb temperature 6: APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-50 NC-40 NC- NC- 9

10 5 MSH-8RV - E MSH-RV - E INDOOR UNIT OUTLINES AND DIMENSIONS holes Indoor unit Unit: mm Installation plate 90 5 Installation plate Wall hole [75 Air in { Liquid line [8-0.5m Gas line [-m Insulation [50 O.D [8 I.D Air out Drain hose [6 Insulation [ Power supply cord Lead to right m Lead to left m Wireless remote controller MUH-8RV - E OUTDOOR UNIT Drainage hole [ Air in 00mm or more 00mm or more 00mm or more 8 90 Air in mm or more 50mm or more Drainage holes [ Air out 50 Service panel Liquid refrigerant pipe joint Refregerant pipe (flared) [ Gas refregerant pipe joint Refregerant pipe (flared) [5.88 0

11 MSH-RV - E Unit: mm INDOOR UNIT Installation plate Indoor unit Wall hole [ Air in 5 5 Installation plate { Liquid line [ m Gas line [ 9-m Insulation [ 50 O.D [ I.D Air out Drain hose [ 6 (Connected part O.D) Insulation [ 8 Wireless remote controller

12 MUH-RV- E MUH-RV- E OUTDOOR UNIT Air intake 7 Outdoor Unit-Necessary surrounding clearance 0 Unit: mm Air intake te:allow adequate 0 upper clearance Front opening Air outlet Terminal block for power line(muh-rv only) Terminal block for indoor and outdoor unit connection Service space Outlet guide installation hole Handle for moving Handle for moving Service panel A Refrigerant-pipe flared connection [5.88 Refrigerant-pipe flared connection [ Drain hole [ o Oval holes (standard bolt M0) Bottom piping hole Knock out hole for front piping (refrigerant,drainage and wiring) Knock out hole for right piping (refrigerant,drainage and wiring) Side air intake 7 95 Outdoor Unit-Necessary surrounding clearance (Concentrated installation) The upper side must be open. R R R max Knock out holes for power line -[7 Handle for moving Drain hole [ -U-shaped notched holes A Rear fresh air intake 8 95 Rear piping hole 00 0 For 0 units or less Standard bolt length 65 Front right piping holesdetail figures

13 6 WIRING DIAGRAM MSH-8RV - E INDOOR UNIT TO OUTDOOR UNIT CONNECTING V MODEL WIRING DIAGRAM L TB BRN BRN RED HIC IC4 CN RT SYMBOL C DSAR F F HIC POWER SUPPLY CORD ~/N -0V 50Hz PE CIRCUIT BREAKER FOR MULTI SYSTEM TO OUTDOOR UNIT CONNECTING MUH-8RV - E OUTDOOR UNIT N BLU 4 CN 5C BLU CN 0-0V~ F BLU WHT TRANS CN BLU BLU 4 F L V N NAME INDOOR FAN CAPACITOR SURGE ABSORBER FUSE (.5A) THERMAL FUSE (9;) DC/DC CONVERTER DSAR GRN/YLW GRN/YLW SYMBOL IC4 MF MV NR RT LD CN 0 CN 5 MV DISPLAY P.C. BOARD MODEL WIRING DIAGRAM 5 CN 0 RECEIVER P.C. BOARD NAME HYBRID IC INDOOR FAN MOTOR (INNER FUSE) VANE MOTOR VARISTOR ROOM TEMPERATURE THERMISTOR NOTES:.About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring).symbols below indicate. : Terminal block : Connector FROM INDOOR UNIT CONNECTING TB V -0V~ N RED BLU WHT WHT RT6 F6 ELECTRONIC CONTROL P.C. BOARD CN X6 REMOTE CONTROLLER NR C CN7 CN66 CN7 CN7 TAB TAB IC88 TRANS NR6 S4 BLK BLK DEICER P.C. BOARD BRN YLW GRY WHT RED BLK MF RT SYMBOL NAME RT INDOOR COIL TEMPERATURE THERMISTOR TB TERMINAL BLOCK 5C CONTACTOR SR6 X6 5C VLT VLT C65 4 CN7 RED WHT BLK VG79B0H0 RED ORN WHT BLK 4 MF GRN/YLW DSAR WHT BLU NO 5C COM C WHT RED BLK S C MC R SYMBOL C C65 DSAR F6 IC88 NAME COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE (A) DC/DC CONVERTER SYMBOL MC MF NR6 RT6 SR6 NAME COMPRESOR (INNER PROTECTOR) OUTDOOR FAN MOTOR (INNER PROTECTOR) VARISTOR DEFROST THERMISTOR SOLID STATE RELAY SYMBOL TB X6 S4 5C NOTES:.About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring).symbols below indicate. : Terminal block : Connector NAME TERMINAL BLOCK R.V. COIL RELAY R.V. COIL COMPRESSOR CONTACTOR SG79J004H0

14 MSH-RV - E INDOOR UNIT TO OUTDOOR UNIT CONNECTING TB V MODEL WIRING DIAGRAM N BLU BLU CN -0V~ F BLU WHT BLU L POWER SUPPLY CORD ~/N -0V 50Hz PE BRN CIRCUIT BREAKER GRN/YLW RED WHT DSAR GRN/YLW LD CN 0 WHT CN 5 MV 5 DISPLAY P.C. BOARD CN 0 RECEIVER P.C. BOARD 4 5C F HIC TRANS ELECTRONIC CONTROL P.C. BOARD REMOTE CONTROLLER NR IC4 C CN CN CN CN 4 BRN YLW GRY WHT RED BLK RT RT MF SYMBOL C DSAR F F HIC NAME INDOOR FAN CAPACITOR SURGE ABSORBER FUSE (.5A) THERMAL FUSE (9;) DC/DC CONVERTER NOTES:.About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing..use copper conductors only. (For field wiring).symbols below indicate. : Terminal block : Connector MUH-RV - E OUTDOOR UNIT FROM INDOOR UNIT CONNECTING V TB N -0V~ WHT GRN/YLW DSAR SYMBOL IC4 MF MV NR RT MODEL WIRING DIAGRAM RT6 CN66 X6 X5 WHT BLU CN66 RT6 T6 BLU WHT CZ 5C SR6 SR6 YLW WHT NAME HYBRID IC INDOOR FAN MOTOR (INNER FUSE) VANE MOTOR VARISTOR ROOM TEMPERATURE THERMISTOR BLK WHT ORN RED RED ORN C YLW BLK WHT MF CN7 X6 COM NO X5 TAB5 COM F6 NO NR6 CN7 5 DEICER P.C. BOARD C A A 5C 4 CN7 RED BLK WHT RED BLU WHT SYMBOL NAME RT INDOOR COIL THERMISTOR TB TERMINAL BLOCK 5C CONTACTOR VG79B0H0 NOTES:.Use copper conductors only (For field wiring). SG79J8H0.Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers (,N,)..Symbols below indicate. :Terminal block, :Connector S4 BLU S C MC R SYMBOL CZ C C DSAR F6 MC MF NR6 RT6 RT6 SR6 SR6 TB T6 X5 X6 S4 5C NAME CZ SURGE ABSORBER COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE (.5A) COMPRESSOR (INNER PROTECTOR) OUTDOOR FAN MOTOR (INNER PROTECTOR) VARISTOR DEFROST THERMISTOR AMBIENT TEMPERATURE THERMISTOR SOLID STATE RELAY SOLID STATE RELAY TERMINAL BLOCK TRANSFORMER CONTACTOR R. V. COIL RELAY R. V. COIL COMPRESSOR CONTACTOR

15 MSH-RV - E MODEL WIRING DIAGRAM INDOOR UNIT TO OUTDOOR UNIT CONNECTING V -0V~ TB N L RED BLU BRN GRN/YLW CN 5 5 CN 0 CN TAB CN 0 HIC TRANS F NR C SR4 4 CN ELECTRONIC CONTROL P.C. BOARD 4 CN CN RT RT BLK GRY YLW BRN WHT RED CN RT MF MV MV MV DISPLAY P.C.BOARD RECEIVER P.C.BOARD REMOTE CONTROLLER SYMBOL C F HIC MF MV NAME INDOOR FAN CAPACITOR FUSE(.5A) DC/DC CONVERTER INDOOR FAN MOTOR(INNER PROTECTOR) VANE MOTOR(HORIZONTAL) SYMBOL MV NR RT RT RT NAME VANE MOTOR(VERTICAL) VARISTOR ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR (MAIN) INDOOR COIL THERMISTOR (SUB) SYMBOL SR4 TB NAME SOLID STATE RELAY TERMINAL BLOCK NOTE:. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.. Use copper conductors only. (For field wiring). Symbols below indicate. /: Terminal block, : Connector SG79J48H0 5

16 MUH-RV - E OUTDOOR UNIT CIRCUIT BREAKER TB L POWER SUPPLY ~ /N -0V 50Hz TO INDOOR UNIT CONNECTING V -0V~ MODEL WIRING DIAGRAM N TB N L PE GRN/YLW DSAR WHT BLU WHT BLU BRN RT6 CN66 X6 RT6 RT6 BLU T6 LEV 6 YLW BLK WHT ORN RED RED ORN C YLW BLK WHT MF CN66 CN7 CN7 CN7 SR6 X5 SR6 X6 COM NO X5 TAB5 COM F6 NO A A 5C NR6 DEICER P.C. BOARD WHT WHT CZ 5C C 5 CN7 WHT RED BLK S4 RED BLU WHT S C MC BLU R SYMBOL NAME SYMBOL NAME SYMBOL NAME CZ C C DSAR F6 LEV MC CZ SURGE ABSRBER COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR SURGE ABSORBER FUSE(.5A) EXPANSION VALVE COIL COMPRESSOR (INNER PROTECTOR) MF NR6 RT6 RT6 RT6 SR6 SR6 OUTDOOR FAN MOTOR (INNER PROTECTOR) VARISTOR DEFROST THERMISTOR DISCHARGE TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR SOLID STATE RELAY SOLID STATE RELAY TB TB T6 X5 X6 S4 5C TERMINAL BLOCK TERMINAL BLOCK TRANSFORMER CONTACTOR R.V. COIL RELAY R.V. COIL COMPRESSOR CONTACTOR NOTE. Use copper conductors only (For field wiring).. Since the indoor and outdoor unit connecting wires have polarity, connect them according to the numbers (,N, L).. Symbols below indicate. /: Terminal block, : Connector SG79J49H0 6

17 7 REFRIGERANT SYSTEM DIAGRAM Unit:mm MSH-8RV - E MUH-8RV - E INDOOR UNIT Refrigerant pipe [5.88 (with heat insulator) Muffler 4- way valve OUTDOOR UNIT Indoor heat exchanger Indoor coil thermistor RT Distributor Flared connection Stop valve (with service port) Strainer Defrost thermistor RT6 Outdoor heat exchanger Room temperature thermistor RT Accumulator Compressor Flared connection Refrigerant pipe[6.5 (with heat insulator) Strainer Stop valve Capillary tube [.0o[.0o500 Capillary tube [.0o[.6o750 ( pcs) R.V. coil Heating ON Cooling OFF Check valve Refrigerant flow in cooling Refrigerant flow in heating Unit:mm MSH-RV - E INDOOR UNIT Refrigerant pipe [5.88 (with heat insulator) Muffler 4- way valve MUH-RV - E OUTDOOR UNIT Indoor heat exchanger Indoor coil thermistor RT Distributor Flared connection Stop valve (with service port) Strainer Outdoor heat exchanger Room temperature thermistor RT Flared connection Refrigerant pipe [9.5 (with heat insulator) Stop valve Strainer Accumulator Check valve Capillary tube [.0X[.0X50 Check valve Compressor Capillary tube [.0X[.6X50 Capillary tube [4.0X[.4X0 Discharge pressure regulator open.5 kgf/f Refrigerant flow in cooling Refrigerant flow in heating Defrost thermistor RT6 Ambient temperature thermistor RT6 R.V. coil Heating ON Cooling OFF 7

18 Unit:mm MSH-RV - E MUH-RV - E INDOOR UNIT Refrigerant pipe [5.88 (with heat insulator) 4-way valve Strainer OUTDOOR UNIT Muffler Indoor heat exchanger Indoor coil thermistor RT(main) Indoor coil thermistor RT(sub) Flared connection Stop valve (with service port) Discharge thermistor RT6 Defrost thermistor RT6 Outdoor heat exchanger Room temperature thermistor RT Strainer Flared connection Refrigerant pipe [9.5 (with heat insulator) Stop valve Accumulator Strainer Check valve Capillary tube [4. [.0 50 Compressor Capillary tube [4. [.0 50 LEV Strainer Ambient temperature thermistor RT6 R.V. coil heating ON cooling OFF Refrigerant flow in cooling Refrigerant flow in heating MAX. REFRIGERANT PIPING LENGTH Model Refrigerant piping Max. length : m A Piping size O.D : mm Gas Liquid Length of connecting pipe : m Indoor unit Outdoor unit MSH-8RV - E MUH-8RV - E MSH-RV - E MUH-RV - E Gas Liquid 0.5 Gas 0 Liquid 0 MSH-RV - E MUH-RV - E MAX. HEIGHT DIFFERENCE Indoor unit wmax. Height difference: 5m (MSH-8/RV)/ 5m (MSH-RV) Refrigerant Piping Max. Length A Outdoor unit w Height difference should be within 5m (MSH-8/RV) / 5m (MSH-RV) regardless of which unit, indoor or outdoor position is high. 8

19 ADDITIONAL REFRIGERANT CHARGE(R : g) Model Outdoor unit precharged 7m Refrigerant piping length (one way) 0m 5m MSH-8RV - E MUH-8RV - E, Calculation : Xg=50g/m (Refrigerant piping length (m) 7) Model Outdoor unit precharged 7m Refrigerant piping length (one way) 0m 5m MSH-RV - E MUH-RV - E, Calculation : Xg=65g/m (Refrigerant piping length (m) 7) Model MSH-RV - E MUH-RV - E Outdoor unit precharged,0 7m 0m Refrigerant piping length (one way) 5m m 5m m Calculation : Xg=65g/mo(Refrigerant piping length(m)-7) 9

20 8 PERFORMANCE CURVES MSH-8RV - E MUH-8RV - E MSH-RV - E MUH-RV - E MSH-RV - MUH-RV - 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 ~ 4V, 50Hz () AIR FLOW Air flow should be set at MAX. () MAIN READINGS () Indoor intake air wet-bulb temperature : CWB () Indoor outlet air wet-bulb temperature : CWB () Outdoor intake air dry-bulb temperature : CDB (4) Total input: W (5) Indoor intake air dry-bulb temperature : CDB (6) Outdoor intake air wet-bulb temperature : CWB (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. How to measure the indoor air wet-bulb/dry-bulb temperature difference. Attach at least sets of wet-and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least sets of wet-and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high.. Attach at least sets of wet-and dry-bulb thermometers to the outdoor air intake. Cover the thermometers to prevent direct rays of the sun.. Check that the air filter is cleaned. 4. Open windows and doors of room. 5. Press the EMERGENCY OPERATION switch once(twice) to start the EMERGENCY COOL(HEAT) MODE. 6. When system stabilizes after more than 5 minutes, measure temperature and take an average temperature minutes later, measure temperature again and check that the temperature does not change. INDOOR UNIT OUTDOOR UNIT } } Cooling Heating Wet-and dry-bulb thermometers Wet-and dry-bulb thermometers MSH-8RV - E MSH-RV - E MSH-RV - E

21 MSH-8RV - E MSH-RV - E MSH-RV - E NOTE:The above curves are for the heating operation without any frost. 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(%) Air flow should be set at MAX. The unit of pressure has been changed to MPa on the international system of units(si unit system). The conversion factor is : (MPa [Gauge]) =0.(kgf/f [Gauge]) (kgf/f[gauge])(mpa[gauge]) MUH-8RV - E MUH-8RV - E Outdoor low pressure V-0V Outdoor unit current (A) V-0V (kgf/f[gauge])(mpa[gauge]) Outdoor low pressure (%) 5(:) (%) Ambient temperature( C) Ambient temperature( C) Ambient humidity(%) Ambient humidity(%) MUH-RV - E V-0V Outdoor unit current (A) MUH-RV - E V 0V 5(:) 0. Ambient temperature( C) Ambient humidity(%) Ambient temperature( C) Ambient humidity(%)

22 (kgf/f[gauge])(mpa[gauge]) Outdoor low pressure MUH-RV - E -0V Ambient temperature( C) Ambient humidity(%) 5(:) (%) HEAT operation Condition indoor:dry bulb temperature.0 C Wet bulb temperature 4.5 C Outdoor:Dry bulb temperature 7,5, C Wet bulb temperature 6,,4.5 C Outdoor unit current(a) Outdoor unit current (A) MUH-RV - E V 70 Ambient temperature( C) Ambient humidity(%) MUH-8RV - E V-0V V 5(:) (%) (:) Ambient temperature( C) MUH-RV - E Outdoor unit current (A) 0 9 V 0V Ambient temperature( C) 9 MUH-RV - E V Outdoor unit current(a) (:) Ambient temperature( C) 0V

23 MSH-8RV - : MUH-8RV - (V) E E CAPACITY : 5.(KW) SHF : 0.66 INPUT : (W) INDOOR DB(:) INDOOR WB(:) OUTDOOR DB(:) 7 5 Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT PERFORMANCE DATA COOL operation 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 CAPACITY : 5.(KW) SHF : 0.66 INPUT : (W) INDOOR DB(:) INDOOR WB(:) OUTDOOR DB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 46 Q SHC SHF INPUT MSH-8RV - : MUH-8RV - (V) E E PERFORMANCE DATA COOL operation 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 5 MSH-8RV - : MUH-8RV - (0V) E E CAPACITY : 5.(KW) SHF : 0.66 INPUT : (W) INDOOR DB(:) INDOOR WB(:) OUTDOOR DB(:) 7 5 Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT PERFORMANCE DATA COOL operation 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

26 CAPACITY : 5.(KW) SHF : 0.66 INPUT : (W) INDOOR DB(:) INDOOR WB(:) OUTDOOR DB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 46 Q SHC SHF INPUT MSH-8RV - : MUH-8RV - (0V) E E PERFORMANCE DATA COOL operation 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

27 7 MSH-RV - : MUH-RV - (V) E E CAPACITY : 6.0(KW) SHF : 0.65 INPUT : 7(W) INDOOR DB(:) INDOOR WB(:) OUTDOOR DB(:) 7 5 Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT PERFORMANCE DATA COOL operation 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

28 CAPACITY : 6.0(KW) SHF : 0.65 INPUT : 7(W) INDOOR DB(:) INDOOR WB(:) OUTDOOR DB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 46 Q SHC SHF INPUT MSH-RV - : MUH-RV - (V) E E PERFORMANCE DATA COOL operation 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

29 9 MSH-RV - : MUH-RV - (0V) E E CAPACITY : 6.0(KW) SHF : 0.65 INPUT : 750(W) INDOOR DB(:) INDOOR WB(:) OUTDOOR DB(:) 7 5 Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT PERFORMANCE DATA COOL operation 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

30 CAPACITY : 6.0(KW) SHF : 0.65 INPUT : 750(W) INDOOR DB(:) INDOOR WB(:) OUTDOOR DB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT 46 Q SHC SHF INPUT MSH-RV - : MUH-RV - (0V) E E PERFORMANCE DATA COOL operation 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

31 PERFORMANCE DATA COOL operation MSH-RV - E : MUH-RV - E (V) CAPACITY : 8.(KW) SHF : 0.6 INPUT : 0(W) OUTDOOR INDOOR INDOOR 5 7 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 DB(:)

32 PERFORMANCE DATA COOL operation MSH-RV - E : MUH-RV - E (V) CAPACITY : 8.(KW) SHF : 0.6 INPUT : 0(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

33 PERFORMANCE DATA COOL operation MSH-RV - E : MUH-RV - E (0V) CAPACITY : 8.(KW) SHF : 0.6 INPUT : 460(W) OUTDOOR DB(:) INDOOR INDOOR 5 7 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

34 PERFORMANCE DATA COOL operation MSH-RV - E : MUH-RV - E (0V) CAPACITY : 8.(KW) SHF : 0.6 INDOOR INDOOR DB(:) WB(:) INPUT : 460(W) OUTDOOR DB(:) 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 46

35 PERFORMANCE DATA HEAT operation MSH-8RV - E : MUH-8RV - E (V) CAPACITY : 5.4(KW) INPUT : 980(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 (0V) CAPACITY : 5.4(KW) INPUT : 70(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 MSH-RV - E : MUH-RV - E (V) CAPACITY : 6.(KW) INPUT : 70(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 (0V) CAPACITY : 6.(KW) INPUT : 580(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 MSH-RV - E : MUH-RV - E (V) CAPACITY : 9.6(KW) INPUT : 5(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 (0V) CAPACITY : 9.6(KW) INPUT : 560(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

36 9 MICROPROCESSOR CONTROL MSH-8RV - E MUH-8RV - E MSH-RV - E MUH-RV - E MSH-RV - E MUH-RV - E WIRELESS REMOTE CONTROLLER MSH-8RV - E Signal transmitting section MSH-RV - E MSH-RV - E Signal transmitting section Operation display section PM OPERATE /STOP (ON /OFF)button ON/OFF TOO WARM AM TOO COOL Operation display section PM TEMPERATURE buttons OPERATE /STOP (ON /OFF)button ON/OFF TOO WARM AM TOO COOL TEMPERATURE buttons ON/OFF TOO WARM TOO COOL VANE CONTROL button OPERATION SELECT button ECONO COOL button RESET button MODE ECONO COOL INDOOR UNIT DISPLAY SECTION Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state. FAN VANE The following indication does not depend on the shape of lamp. Operation Indicator I FEEL HEAT COOL DRY RESET CLOCK STOP START HR. MIN. FAN SPEED CONTROL button OFF-TIMER button ON-TIMER button HR. button MIN. button (TIME SET button) CLOCK SET button lighted not lighted VANE button (Horizontal vane button) OPERATION SELECT button ECONO COOL button WIDE VANE button (Vertical vane button) RESET button I FEEL HEAT ON/OFF COOL DRY MODE ECONO COOL TOO WARM FAN VANE CLOCK WIDE VANE LONG RESET CLOCK AM PM TOO COOL STOP START HR. MIN. FAN SPEED CONTROL button OFF-TIMER button ON-TIMER button HR. button MIN. button (TIME SET button) CLOCK SET button LONG button Once the operation mode are set, the same operation mode can be repeated by simply turning the OPERATE/STOP (ON/OFF) button ON. Indoor unit receives the signal with a beep tone. When the system turns off, -minute time delay will operate to protect system from overload and compressor will not restart for minutes. Indication Operation state This shows that the air conditioner is operating to reach the target temperature. Please wait unit the target temperature is obtained. This shows that the room temperature is approaching the target temperature. Difference between target temperature and room temperature Approx. : or more Approx. : or less 9-. I FEEL CONTROL ( ) OPERATION () Press OPERATE/STOP (ON/OFF) button on the remote controller. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. () Select I FEEL CONTROL mode with the OPERATION SELECT button. () The operation mode is determined by the room temperature at start-up of the operation. 6 Initial room temperature 5: or more :to 5: less than : Mode COOL mode of "I FEEL CONTROL" DRY mode of "I FEEL CONTROL" HEAT mode of "I FEEL CONTROL"

37 Once the mode is fixed, the mode does not change by room temperature afterwards. Under the ON-TIMER ( ) operation, mode is determined according to the room temperature at the set time the operation starts. When the system is stopped on the remote controller, and restarted within hours in I FEEL CONTROL ( ) mode, the system operates in previous mode automatically regardless of the room temperature. Example Previous operation COOL mode of I FEEL CONTROL or COOL mode Restart COOL mode of I FEEL CONTROL When the system is restarted after hours and more, the operation mode is determined by the room temperature at start-up of the operation. Example Previous operation COOL mode of I FEEL CONTROL or COOL mode Restart COOL or DRY or HEAT mode of I FEEL CONTROL that determined by room temperature at start-up of the operation. (4) The initial set temperature is decided by the initial room temperature. Model Initial room temperature Initial set temperature COOL mode of "I FEEL CONTROL" DRY mode of "I FEEL CONTROL" HEAT mode of "I FEEL CONTROL" : or more 5: to : : to 5: : Initial room temperature minus : Initial room temperature minus : less than : : When the system is restarted with the remote controller, the system operates with the previous set temperature regardless of room temperature at restart. The set temperature is calculated by the previous set temperature. (5) TEMPERATURE buttons In I FEEL CONTROL ( ) mode, set temperature is decided by the microprocessor based on the room temperature. In addition, set temperature can be controlled by TOO WARM or TOO COOL buttons when you feel too cool or too warm. Each time the TOO WARM or TOO COOL button is pressed, the indoor unit receives the signal and emits a beep tone. Fuzzy control When the TOO COOL or TOO WARM button is pressed, the microprocessor changes the set temperature, considering the room temperature, the frequency of pressing TOO COOL or TOO WARM button and the user s preference to heat or cool. So this is called Fuzzy control, and works only in I FEEL CONTROL mode. In DRY mode of I FEEL CONTROL, the set temperature doesn t change. TOO COOL To raise the set temperature ~ degrees( C) TOO WARM To lower the set temperature ~ degrees( C) 7

38 9--. COOL mode of I FEEL CONTROL. Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button. In AUTO the fan speed is as follows. Initial temperature difference Fan Speed Room temperature minus set temperature : degrees or more High Room temperature minus set temperature : Between and.7 degrees Med. Room temperature minus set temperature : less than degree Low Difference between room temperature and set temperature during operation deg. 4deg. deg..7deg.. Coil frost prevention Temperature control When the indoor coil thermistor RT reads C or below(msh-8/rv)/ RT or RT reads - C or below(msh-rv), the coil frost prevention mode starts immediately. However, the coil frost prevention doesn t work for 5 minutes since the compressor has started. The indoor fan operates at the set speed and the compressor stops for 5 minutes. After that, if RT still reads below C(MSH-8/RV)/ RT or RT still reads below- C(MSH-RV) this mode prolonged until the RT reads over C(MSH-8/RV)/ RT or RT still reads over- C(MSH-RV). Time control When the three conditions as follows have been satisfied for hour and 45 minutes, compressor stops for minutes. a. Compressor has been continuously operating. b. Indoor fan speed is Low or Med. c. Room temperature is below C. When compressor stops, the accumulated time is cancelled and when compressor restarts, time counting starts from the beginning. Time counting also stops temporarily when the indoor fan speed becomes High or the room temperature exceeds C. However, when two of the above conditions (b.and c.) are satisfied again. Time accumulation is resumed. Operation chart Example Compressor Outdoor fan OFF ON OFF ON Indoor fan ON (continuously at set speed). Outdoor fan speed control <MSH-/RV only> Outdoor fan speed is controlled according to the temperature of ambient temperature thermistor RT6. Outdoor fan Low operation : When the outside temperature decreases to 8 C(MSH-RV)/ C(MSH-RV) or less. Until the outside temperature goes to C(MSH-RV)/ 7 C(MSH-RV) or more. Outdoor fan High operation : Until the outside temperature decreases to 8 C(MSH-RV)/ C(MSH-RV) or less. When the outside temperature goes to C(MSH-RV)/ 7 C(MSH-RV) or more. Ambient temperature Outdoor fan speed thermistor RT6 temperature High Low 8: : (MSH-RV) : 7: (MSH-RV) NOTE. : If the temperature of RT6 reads from 8: to :(MSH-RV)/ from :to 7:(MSH-RV) at the air conditioner starting outdoor fan speed is High. NOTE. : <MSH-RV only> When indoor fan speed is Low except HEAT operation mode and the outside temperature is 9: or less, the outdoor fan operates at Low. Outdoor fan Low operation is cancelled according to the following conditions( or ): When the operation is not changed and the outside temperature goes to : or more. When the operation is changed. (Change to HEAT operation mode / Change of the indoor fan speed) 4. Discharge temperature protection <MSH-RV only> The compressor is controlled by the temperature of discharge temperature thermistor RT6 for excess rise protection of compressor discharge pressure. Compressor When the temperature of discharge temperature thermistor RT6 goes to : or more, the compressor is turned OFF. After minutes since the compressor has been turned OFF, if the temperature of discharge temperature thermistor RT6 becomes 00: or less, the compressor is turned ON DRY mode of I FEEL CONTROL The system for dry operation uses the same refrigerant circuit as the cooling circuit. The compressor and the indoor fan are controlled by the room temperature. By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease. 8

39 . Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button. However, in AUTO fan operation, fan speed becomes Low.. The operation of the compressor and indoor/ outdoor fan Compressor operates by room temperature control and time control. Set temperature is controlled to fall C from initial room temperature. Indoor fan and outdoor fan operate in the same cycle as the compressor. When the room temperature is C or over: When the thermostat is ON, the compressor repeats 8 minutes ON and minutes OFF. When the thermostat is OFF, the compressor repeats 4 minutes OFF and minute ON. When the room temperature is under C. When the thermostat is ON, the compressor repeats minutes ON and minutes OFF. When the thermostat is OFF, the compressor repeats 4 minutes OFF and minute ON. Operation time chart Example ON ON Thermostat OFF OFF ON ON ON Indoor fan OFF OFF OFF ON ON ON Outdoor fan Compressor OFF OFF OFF 8 min. min. 4 min. min.. Coil frost prevention The operation is as same as coil frost prevention during COOL mode of I FEEL CONTROL. Indoor fan operates at the set speed and the compressor stops for 5 minutes, because protection(coil frost prevention) has the priority. However, when coil frost prevention works while the compressor is not operating, it s speed becomes Low. 4. Outdoor fan control <MSH-/RV only> Outdoor fan control is as same as one of COOL mode of I FEEL CONTROL HEAT mode of I FEEL CONTROL. Indoor fan speed control () In AUTO the fan speed is as follows. Initial temperature difference Fan speed Set temperature minus room temperature: degrees or more High Set temperature minus room temperature: Between and degrees Med. deg. 4deg. Set temperature minus room temperature: less than degree Low () Cold air prevention control deg..7deg. The fan runs at set speed when the indoor coil thermistor RT temperature exceeds C. The fan operates Low when the temperature of indoor coil thermistor RT is below 8 C. But the fan stops when the indoor fan operates at Very Low and the room temperature is 5 C or less. Indoor coil thermistor RT temperature Released Cold Air Prevention 8: : Fan speed Set speed Very Low or stop Difference between room temperature and set temperature during operation NOTE : If the temperature of RT reads from 8 C to C at the air conditioner starting and also after defrosting, this control works. () Warm air control. When compressor starts in heating operation or after defrosting, the fan changes the speed due to the indoor coil thermistor RT temperature to blow out warm air. After releasing of cold air prevention, when the indoor coil thermistor RT temperature is 7 C or above, the fan speed shifts to the set speed, and when the fan speed is changed by the remote controller, the fan speed is the set speed. When the indoor coil thermistor RT temperature is less than 7 C, the fan speed is controlled by time as below. 9

40 <Time condition> <Indoor fan speed> less than minutes Low minutes to 4 minutes Med. 4 minutes or more High The upper limit of the fan speed is the set speed. If the thermostat turns off, this operation changes to flow soft control. (4) Flow soft control After the thermostat turns off, the indoor fan operates at Very Low. NOTE : When the thermostat turns on, the fan operates at the set speed. Due to the cold air prevention control, the fan does not start at set speed until the indoor coil thermistor RT reads C or more.. Outdoor fan speed control <MSH-/RV only> Outdoor fan speed is controlled according to the temperature of ambient temperature thermistor RT6. Outdoor fan Low operation : Until the outside temperature decreases to C(MSH-RV)/ C(MSH-RV). When the outside temperature goes to 4 C(MSH-RV)/ 8 C(MSH-RV) or more. Outdoor fan High operation :When the outside temperature decreases to C(MSH-RV)/ C(MSH-RV) or less. Until the outside temperature goes to 4 C(MSH-RV)/ 8 C(MSH-RV). Low. High pressure protection <MSH-8/RV> : : 4: (MSH-RV) 8: (MSH-RV) During heating operation, the outdoor fan motor is controlled by the temperature of indoor coil thermistor RT for excess rise protection of compressor discharge pressure. (MSH-8RV) Outdoor fan OFF : 60 C Outdoor fan ON : 56 C (MSH-RV) Outdoor fan OFF : 5 C Outdoor fan ON : 48 C High pressure protection chart Example Indoor coil thermistor RT temperature (MSH-8RV) 60 C (MSH-RV) 5 C (MSH-8RV) 56 C (MSH-RV) 48 C Ambient temperature thermistor RT6 temperature High pressure protection Released (MSH-8RV) 56: 60: (MSH-RV) 48: 5: Outdoor fan speed Outdoor fan OFF ON High Outdoor fan motor turn OFF Outdoor fan motor turn ON Outdoor fan motor ON OFF ON OFF NOTE During high pressure protection and for 4 minutes and 5 seconds after high pressure protection, defrosting of outdoor heat exchanger is not detected by the defrost thermistor RT6. NOTE When connected to MXZ-NV- E, MXZ-NV- E, MXZ-RV- E or MXZ-SV- E outdoor unit, the indoor unit send the data for the temperature to the outdoor unit according to the indoor coil thermistor RT temperature. For the further information, refer to the service manual.ob85 REVISED EDITION C (Outdoor unit: MXZ-NV- E or MXZ-NV- E ),.OB7 REVISED EDITION-B(Outdoor unit: MXZ-RV- E ) or.ob54 (Outdoor unit: MXZ-SV- E ). <MSH-RV> During heating operation, the outdoor fan and the compressor are controlled by the temperature of indoor coil thermistor RT for excess rise protection of compressor discharge pressure. Outdoor fan When the temperature of indoor coil thermistor RT goes to 55: or more, the outdoor fan is turned OFF. When the temperature of indoor coil thermistor RT becomes to 5: or less, the outdoor fan is turned ON. Compressor When the temperature of indoor coil thermistor RT goes to 75: or more, the compressor is turned OFF. minutes after the compressor is turned OFF and if the temperature of indoor coil thermistor RT becomes 75: or less, the compressor is turned ON. NOTE : During the high pressure protection and for 0 seconds after high pressure protection, defrosting of outdoor heat exchanger is not detected by the defrost thermistor RT6. 4. Discharge temperature protection <MSH-RV only> Discharge temperature protection is as same as during COOL mode of I FEEL CONTROL. 40

41 5. Defrosting Defrosting of outdoor heat exchanger is controlled by deicer P.C. board, with detection by the defrost thermistor RT6. () Starting conditions of defrost When all conditions of a) ~ c) are satisfied, the defrosting operation starts. a) Under the heat operation, the compressor cumulative operation time exceeds 40 minutes without the defrosting operation working. b) The defrost thermistor RT6 reads - C or less. c) After releasing the high pressure protection 4 minutes and 5 seconds(msh-8/rv)/ 0 seconds(msh-rv) have elapsed. () Releasing conditions of defrost When the condition d) or e) is satisfied, the defrosting operation stops. d) The defrost thermistor RT6 reads C(MSH-8/RV)/ C(MSH-RV) or more. e) The defrosting time exceeds 0 minutes. () Defrosting time chart Defrost thermistor RT6 : or more(msh-rv) : or more(msh-8/rv) -: or less Outdoor 5C contactor(compressor) ON OFF X6 (R.V. coil) ON OFF sec. 5 sec. sec. 5 sec. SR6 Outdoor fan ON OFF (MSH-/RV) (MSH-8RV) Defrost counter ON OFF Max 0 min. Indoor fan ON Very Low OFF NOTE Horizontal Indoor vane Set position NOTE When the indoor coil thermistor RT reads above 8 C, indoor fan operates at Very Low for seconds. When the indoor coil thermistor RT reads 8 C or less, the indoor fan stops. NOTE Refer to the Service Manual OB85 REVISED EDITION C when MSH-8RV- E is connected with MXZ-NV- E or MXZ-NV- E as multi system units. Refer to the Service Manual OB7 REVISED EDITION-B when MSH-8RV- E is connected with MXZ-RV- E as multi system units. Refer to the Service Manual OB54 when MSH-8RV- E is connected with MXZ-SV- E as multi system units. 4

42 6. 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. NOTE Refer to the Service Manual OB85 REVISED EDITION C when MSH-8RV- E is connected with MXZ-NV- E or MXZ-NV- E as multi system units. Refer to the Service Manual OB7 REVISED EDITION-B when MSH-8RV- E is connected with MXZ-RV- E as multi system units. Refer to the Service Manual OB54 when MSH-8RV- E is connected with MXZ-SV- E as multi system units. (COOL / DRY) (HEAT) 5 sec. 5 sec. Compressor R.V. coil Outdoor fan ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF 9-. COOL ( ) OPERATION () Press OPERATE/STOP (ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. () Select COOL mode with the OPERATION SELECT button. () Press the TEMPERATURE buttons. (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 6 ~ C. Indoor fan continues to operate regardless of thermostat s OFF-ON at set speed. Coil frost prevention is as same as COOL mode of I FEEL CONTROL. 9-. DRY ( ) OPERATION () Press OPERATE/STOP (ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. () Select DRY mode with the OPERATION SELECT button. () The microprocessor reads the room temperature and determines the set temperature. Set temperature is as shown on the right chart. Thermostat (SET TEMP.)does not work. The other operations are same as DRY mode of I FEEL CONTROL. (4) DRY operation will not function when the room temperature is C or below HEAT ( ) OPERATION () Press OPERATE/STOP (ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. () Select HEAT mode with the OPERATION SELECT button. () Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 6 ~ C. (4) Indoor fan speed control, high pressure protection, defrosting, R.V. coil control are the same as HEAT mode of I FEEL CONTROL. 4

43 9-5. INDOOR FAN MOTOR CONTROL () Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feed back the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (High, Med., Low), the microprocessor controls IC4(MSH-8/RV)/ SR4(MSH-RV) and adjusts fan motor electric current to make the current rotational frequency close to the target rotational frequency. With this control, when the fan speed is switched, the rotational frequency changes smoothly. Rotational frequency High Med. Low High time () Fan motor lock-up protection When the rotational frequency feedback signal has not output for seconds, (or when the microprocessor cannot detect the signal for seconds) the fan motor is regarded locked-up. Then the electric current to the fan motor is shut off. minutes later, the electric current is applied to the fan motor again. During the fan motor lock-up, the OPERATION INDICATOR Indicator lamp flashes on and off to show the fan motor abnormality. (Refer to page 55 or 56.) 9-6. AUTO VANE OPERATION. Horizontal vane () Vane motor drive These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. V) transmitted from indoor microprocessor. () The horizontal vane angle and mode changes as follows by pressing the VANE CONTROL button(msh-8/rv)/ VANE button(msh-rv). AUTO 4 5 Horizontal Middle Downward Swing () Positioning The vane is once pressed to the vane stopper below to confirm the standard position and then set to the desired angle. Confirming of standard position is performed in case of follows. (a) When the OPERATE/STOP (ON/OFF) button is pressed. (b) When the vane control is changed from AUTO to MANUAL. (c) When the SWING is finished. (d) When the test run starts. (e) When the power supply turns ON. (4) VANE AUTO ( ) mode In VANE AUTO mode, the microprocessor automatically determines the vane angle and operation to make the optimum room-temperature distribution. In COOL and DRY operation Vane angle is fixed to Angle. ➁ In HEAT operation Vane angle is fixed to Angle 4. 4

44 (5) STOP (operation OFF) and ON-TIMER standby. When the following cases occur, the horizontal vane returns to the closed position. (a) When the OPERATE/STOP (ON/OFF) button is pressed (POWER OFF). (b) When the operation is stopped by the emergency operation. (c) When the ON-TIMER is on standby. (6) Dew prevention During COOL or DRY operation at Vane Angle 4 or 5 when the cumulative operation time of compressor exceeds hour, the vane angle automatically changes to Angle for dew prevention. (7) SWING MODE ( ) By selecting SWING mode with the VANE CONTROL button (MSH-8/RV) / VANE button (MSH-RV), the horizontal vane swings vertically. The remote controller displays. (8) Cold air prevention in HEAT operation When any of the following conditions occurs in HEAT operation, the vane angle changes to Angle automatically to prevent cold air blowing on users. Compressor is not operating. ➁ Defrosting is performed. ➂ Indoor coil thermistor RT reads : or below. ➃ Indoor coil thermistor RT temperature is raising from C or below, but it does not exceed 8:. Indoor coil thermistor RT temperature Released Horizontal vane Set position Cold Air Prevention Angle : 8: NOTE: If the temperature of RT reads from : to 8: at the air conditioner starting, this control works. (9) ECONO COOL ( ) operation (ECONOmical operation) When the ECONO COOL button is pressed in COOL mode, set temperature is automatically set C higher than that in COOL mode. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(tp(w )). SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher than that in COOL mode, the air conditioner can keep comfort. As a result, energy can be saved. ECONO COOL operation is cancelled when the ECONO COOL button is pressed once again or VANE CONTROL button(msh-8/rv)/ VANE button(msh-rv) is pressed or LONG button(msh-rv only) is pressed or change to other operation mode. NOTE : ECONO COOL operation does not work in COOL mode of I FEEL CONTROL. SWING operation w Tp : Value of RT (MSH-8/RV) Minimum value of indoor coil thermistor (main) RT and indoor coil thermistor (sub) RT (MSH-RV) In swing operation of ECONO COOL operation air flow is initially blew out upward(levelly). According to the temperature of indoor coil thermistor Tp(w ) at starting of this operation, next downward blow time is decided. Then when the downward blow has been finished, next upward blow time is decided. For initial 0 minutes the swing operation is performed in table G~H for quick cooling(but G : Tp(w ) is : or less). Also, after 0 minutes when the difference of set temperature and room temperature is more than :, the swing operation is performed in table D~H for more cooling(but D: Tp(w ) is : or less). The air conditioner repeats the swing operation in various cycle as follows. Temperature of Tp(w ) Downward blow time (sec.) Upward(level) blow time (sec.) A B C D E F G H 5 C or less 5 C to 7 C 7 C to 8 C 8 C to C C to C C to C C to C more than C

45 (0) LONG MODE ( ) <MSH-RV only> By pressing the LONG button fan speed becomes faster than setting fan speed on the remote controller, and the horizontal vane moves to the position for LONG mode. The remote controller displays. LONG mode is cancelled when the LONG button is pressed once again or the VANE button is pressed or ECONO COOL button is pressed in COOL mode. In the following example, the vertical vane is set to (front.). COOL / DRY HEAT Fan speed : Faster Solid arrow : When the LONG mode is used. Dotted arrow : When the LONG mode is not used.. Vertical vane <MSH-RV only> () Vane motor drive This model is equipped with a stepping motor for the vertical vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. V) transmitted from microprocessor. () The vertical vane angle and mode change as follows by pressing the WIDE VANE button. 4 SWING 5 6 () Positioning The vane is once pressed to the vane stopper to confirm the standard position and then set to the desired angle. Confirming of standard position is performed in case of follows. (a) When the OPERATE/STOP(ON/OFF) button is pressed (POWER ON/OFF). (b) When the SWING is started or finished. (c) When the power supply turns ON. (4) SWING MODE ( ) By selecting SWING mode with the WIDE VANE button, the vertical vane swings horizontally. The remote controller displays. The vane moves right and left in the width of Angle 4 repeatedly. (5) WIDE MODE ( ) By selecting WIDE mode with the WIDE VANE button, indoor fan speed becomes faster than setting fan speed on the remote controller (W). The remote controller displays. NOTE : The position of vane angle, angle 4 and angle 5 are different in COOL operation and HEAT operation. W Indoor fan speed becomes faster than setting fan speed on the remote controller even when or is selected. Horizontal AIR FLOW blowing range About 00- COOL and DRY About 50- HEAT 45

46 9-7. TIMER OPERATION. How to set the timer () Press OPERATE/STOP (ON/OFF) button to start the air conditioner. () Check that the current time is set correctly. NOTE : Timer operation will not work without setting the current time. Initially AM0:00 blinks at the current time display of TIME MONITOR, so set the current time correctly with CLOCK SET button. () Press TIMER CONTROL button to select the operation. ON-TIMER button... AUTO START operation (ON timer) OFF-TIMER button... AUTO STOP operation (OFF timer) (4) Press HR. and MIN. button to set the timer. Time setting is 0-minute units. HR. and MIN. button will work when or mark is flashing. These marks disappear in minute. After setting the ON timer, check that OPERATION INDICATOR lamp of the indoor unit lights. NOTE : Be sure to place the remote controller at the position where its signal can reach the air conditioner even during TIMER operation, or the set time may deviate within the range of about 0 minutes. NOTE : Reset the timer in the following cases, or the set time may deviate and other malfunctions may occur. A power failure occurs. The circuit breaker functions.. Cancel TIMER setting can be cancelled with the ON/OFF TIMER buttons. To cancel the ON timer, press the ON-TIMER button. To cancel the OFF timer, press the OFF-TIMER button. TIMER is cancelled and the display of set time disappears. PROGRAM TIMER The OFF timer and ON timer can be used in combination. and display shows the order of the OFF timer and ON timer operation. (Example ) The current time is 8:00 PM. The unit turns off at :00 PM, and on at 6:00 AM. (Example ) The current time is :00 AM. The unit turns on at 5:00 PM, and off at 9:00 PM. PM PM AM PM NOTE : TIMER setting will be cancelled by power failure or breaker functioning. 46

47 9-8. EMERGENCY-TEST OPERATION In case of test run operation or emergency operation, use the EMERGENCY OPERATION switch on the front of the indoor unit. Emergency operation is available when the remote controller is missing, has failed or the batteries of remote controller run down. The unit will start and the OPERATION INDICATOR lamp will light. The first minutes of operation is the test run operation. This operation is for servicing. The indoor fan speed runs at High speed and the system is in continuous operation. (The thermostat is ON.) After minutes of test run operation the system shifts to EMERGENCY COOL / HEAT MODE with a set temperature of C. The fan speed shifts to Med. speed. The coil frost prevention works even in emergency operation, and defrosting too. In the test run or emergency operation, the horizontal vane operates in VANE AUTO ( ) mode. Emergency operation continues until the EMERGENCY OPERATION switch is pressed once or twice or the unit receives any signal from the remote controller. In case of latter normal operation will start. NOTE : Do not press the EMERGENCY OPERATION switch during normal operation. MSH-8RV - E MSH-RV - E The following indication does not depend on the shape of lamp. OPERATION INDICATOR lamp Press once Press again Press once again <Cool> <Heat> <Stop> EMERGENCY OPERATION switch MSH-RV - E EMERGENCY OPERATION switch 47

48 9-9. LEV control <MSH-RV only> LEV (Expansion valve) is controlled by Thermostat ON commands given from the unit. Basic specification General operation Controlled range Drive speed Opening set Stop of indoor unit Remote controller ON Power ON (Breaker ON) Approximate for minutes since compressor has started. From approximate minutes to approximate minutes (for minutes) since compressor has started. After minutes passed since compressor has started. At thermostat OFF At thermostat ON At remote controller OFF Minimum : 54 pulse, Maximum : 500 pulse ~ 90 pulse / second The setting is always in opening direction. (When closing LEV, open the LEV to adjust to set opening after closing the LEV at once.) Opening in stop : 50 pulse LEV opening is set to becomes 500 pulse after minutes passed. LEV positioning (LEV is closed completely at once) LEV is positioned. However, afterwards, LEV is not positioned at the first remote controller ON. Opening is set by the initial opening. (Initial opening is set according to each operation modes and outer temperature conditions.) Opening is set by standard opening. (Standard opening is set according to each operation modes and outer temperature conditions.) LEV opening is corrected to be once every minutes so that discharge temperature becomes the target discharge temperature. (When the discharge temperature is lower than target one : LEV is corrected in closed direction, when the discharge temperature is higher than target one : LEV is corrected in opening direction.) Opening in stop : 50 pulse LEV is set to the initial opening after about minutes passed. Same as the starting of compressor operation Opening in stop : 50 pulse LEV is set so that the opening is opened completely at the speed of 4 pulse every 5 seconds in opening after about minutes passed. () LEV opening correction by discharge temperature The LEV opening is corrected according to the temperature difference between target discharge temperature (Tb) and actual discharge temperature (Ta). The LEV correction is used properly for two kinds according to the LEV opening status at operation off. Rank Opening immediately before having stopped last time Ta (:) more than Tb+0 Tb+5 to Tb+0 Tb+ to Tb+5 Tb- to Tb+ Tb-5 to Tb- Tb-0 to Tb-5 less than Tb-0 00 pulse or less Cooling / Heating pulse or more Cooling / Heating NOTE : Discharge temperature : Ta, Target discharge temperature : Tb 48

49 When the temperature difference RT between indoor coil thermistor (main) RT and indoor coil thermistor (sub) RT in the indoor unit is : or more for a fixed time at cool or dry operation, the target discharge temperature is changed. After the temperature is changed, when temperature difference RT is : or more, the target temperature is changed again. The LEV opening is controlled based on the changed target discharge temperature and the temperature difference RT. Ta (:) more than Tb+0 Tb+5 to Tb+0 Tb+ to Tb+5 Tb- to Tb+ Tb-5 to Tb- Tb-0 to Tb-5 less than Tb-0 less than : NOTE : Discharge temperature : Ta, Target discharge temperature : Tb RT : or more and less than : : or more The target discharge temperature (Tb) is set according to the operation mode or the unit status as follows Operation mode HEAT COOL (rmal) COOL ( RT is less than :, or RT is :or more and less than :.) COOL ( RT is :or more.) NOTE : Target discharge temperature : Tb Tb (:) NOTE : When the discharge temperature (Ta) is 50: or less on the cool operation, or is 49: or less on heat operation, LEV opening is set in 54 pulse. When this state continues for minutes, the compressor is stopped and restarts in minutes. When the compressor is stopped, the indoor unit indicates the abnormality of refrigerant system and stops. (OPERATION INDICATOR lamp is 0-time flashing on and off.) () LEV time chart LEV opening Power ON Opening completely Remote Operation controller ON Standard opening Initial opening Thermostat OFF Operation Standard opening Thermostat ON Initial opening Remote controller OFF Opening completely Remote controller ON Standard opening Initial opening Operation Positioning Opening in stop Opening in stop Positioning NOTE : Opening increases and decreases to be in the target discharge temperature during operation. Time 49

50 0 SERVICE FUNCTIONS MSH-8RV - E MUH-8RV - E MSH-RV - E MUH-RV - E MSH-RV - E MUH-RV - E 0-. COMPULSORY DEFROSTING MODE FOR SERVICE By short circuit of the connector JP607 and R85(MSH-8RV)/ JPG and R87(MSH-/RV) on the outdoor deicer P.C. board, defrosting mode can be accomplished regardless of the defrost interval restriction. (Refer to page 69 or 70.) Defrost thermistor RT6 must read below - C. 0-. CHANGE IN DEFROST SETTING MUH-8RV <JPC> When the JPC wire of the deicer P.C. board is cut, the defrost interval time will be changed. <JPE> When the JPE wire of the deicer P.C. board is cut, the defrost temperature will be changed. (Refer to page 69.) MUH-/RV <JRF> When the JRF wire of the deicer P.C. board is cut, the defrost interval time will be changed. <JRG> When the JRG wire of the deicer P.C. board is cut, the defrost temperature will be changed. (Refer to page 70.) Model Jumper wire Change point JPC Defrost interval time changes from 40 minutes to 5 minutes. MUH-8RV - E Defrost start temperature changes from -: to 0:. JPE Defrost finish temperature changes from : to 0:. Model Jumper wire Change point JRF Defrost interval time changes from 40 minutes to 5 minutes. MUH-RV - E Defrost start temperature does not change.(-.0:) MUH-RV - E JRG Defrost finish temperature changes from : to 5:.(MSH-RV) Defrost finish temperature changes from : to 5:.(NSH-RV) 0-. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS the electronic control P.C. board. The time will be shortened as follows. Set time : minute -second Set time : minute -second (It takes minutes for the compressor to start operation. However, the starting time is shortened by short circuit of JPG and JPS.) 0-4. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION A maximum of 4 indoor units with wireless remote controllers can be used in a room. In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be modified according to the number of the indoor unit. How to modify the remote controller P.C. board Remove batteries before modification. The board has a print as shown below : NOTE : For remodelling, take out the batteries and push the OPERATE/STOP(ON/OFF)button twice or times at first. After finish remodelling, put back the batteries then push the RESET button. The P.C. board has the print J and J. Solder J and J according to the number of indoor unit as shown in Table. After modification, push the RESET button. 50

51 Table. unit. unit. unit. 4 unit unit operation modification units operation Same as at left Solder J units operation Same as at left Same as at left Solder J 4 units operation Same as at left Same as at left Same as at left Solder both J and J NOTE : At power supply failure or installation, indoor unit deletes the memory about remote controller. When the power supply is turned on and indoor unit receives the first signals from the remote controller, the remote controller number is designated as the indoor unit number. Therefore at and after the second time indoor unit accepts the remote controller of the initial setting number. At setting - error, turn the power supply off to cancel the individual operation and then turn the power supply on to restart the setting AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are memorized by the indoor electronic control P.C.board. The AUTO RESTART FUNCTION sets to work the moment power has restored after power failure.then, the unit will restart automatically. However if the unit is operated in I FEEL CON- TROL mode before power failure, the operation is not memorized. In I FEEL CONTROL mode, the operation is decided by the initial room temperature. How to set AUTO RESTART FUNCTION Turn off the main power for the unit. Pull out the electronic control P.C. board and the display P.C.board. MSH-8/RV MSH-RV (Refer to page 7 or 7.) C Cut the RESISTOR JR06 (MSH- IC4 8/RV) / JR07 (MSH-RV) on the indoor electronic control P.C.board. CN (Refer to page 67 or 68.) 5C CN C CN TAB CN CN CN CN IC0 RA0 BZ CN0 SW CNCNCN IC0 RA0 SW CN5 CN0 CN5 IC5 JR06 Operation If the main power (-0V AC) has been cut, the operation settings remain. After the power is restored, the unit restarts automatically according to the memory.(however, it takes at least minutes for the compressor to start running.) NOTE The operation settings are memorized when 0 seconds have passed after the remote controller was operated with the remote controller. If main power is turned off or a power failure occurs while AUTO START/STOP timer is active,the timer setting is cancelled. If the unit has been off with the remote controller before power failure, the auto restart function does not work as the power button of the remote controller is off. To prevent breaker off due to the rush of starting current, systematize other home appliances not to turn on at the same time. When some air conditioners are connected to the same supply system, if they are operated before power failure, the starting current of all the compressors may flow simultaneously at restart. Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current by adding to the system that allows the units to start one by one. 5 JR07

52 TROUBLESHOOTING MSH-8RV - E MUH-8RV - E MSH-RV - E MUH-RV - E MSH-RV - E MUH-RV - E -. Cautions on troubleshooting. Before troubleshooting, check the following: () Check the power supply voltage. () Check the indoor/outdoor connecting wire for mis-wiring.. Take care the following during servicing. () Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug. () Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board. () When removing the 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. Troubleshooting procedure () First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is flashing on and off before starting service work. () Before servicing check that the connector and terminal are connected properly. () If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discolouration. (4) When troubleshooting, refer to the flow chart on page 5 or 54 and the check table on page 55 or How to replace batteries Weak batteries may cause the remote controller malfunction. In this case, replace the batteries to operate the remote controller normally. Remove the front lid and insert batteries. Then reattach the front lid. Press the RESET button with tip end of ball point pen or the like, and then use the remote controller. Insert the negative pole of the batteries first. Check if the polarity of the batteries are correct. RESET button NOTE. :. If the RESET button is not pressed, the remote controller may not operate correctly.. In these illustrations remote controller of MSH-8/RV- E. NOTE. : INFORMATION FOR MULTI SYSTEM AIR CONDITIONER (OUTDOOR UNIT : MXZ-NV- E MXZ-NV- E MXZ-RV- E MXZ-SV- E ) Multi system air conditioner (Outdoor unit MXZ-NV- E MXZ-NV- E MXZ-RV- E MXZ-SV- E ) can connect two or more indoor units with one outdoor unit. According to the capacity, two or more units can operate simultaneously. When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and the other for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor units that will start the operation later cannot operate, indicating as shown in the figure below. In this case, please set all the indoor units to the same operation mode. Operation Indicator lighted When indoor units starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max. 0 minutes) to blow out the warm air. In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flowing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it. 5 flashing

53 -. Instruction of troubleshooting MSH-8RV 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 operate even in Test Run operation. Unit doesn't operate normal operation in COOL or HEAT mode. 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" on page 67. Refer to D "Check of outdoor unit" on page 60. Refer to F "Check of R.V. coil" on page 6. Refer to B "Check of remote controller and receiver P.C. board" on page 59.. Check indoor / outdoor connecting wire.. Refer to C "Check of indoor electronic control P.C. board" on page 60. Flash on and off at 0.5-second intervals Cause: Indoor/ Outdoor unit Mis-wiring -time flash Cause: Indoor/ Outdoor unit Trouble of serial signal -time flash Cause: Indoor unit Trouble of room temperature/ indoor coil thermistor -time flash Cause: Indoor unit Trouble of indoor fan motor 6-time flash Cause: Outdoor unit Trouble of thermistor in outdoor unit Refer to G "How to check mis-wiring and serial signal error(when outdoor unit doesn't work)" on page 64. W. Check room temperature thermistor and indoor coil thermistor. Refer to "Test point diagram and voltage" on page 67. Refer to A "Check of indoor fan motor" on page 59. Refer to J "Check of outdoor thermistor" on page 66. 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. 5

54 MSH-/RV 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 operate even in Test Run operation. Outdoor unit doesn't stop even if indoor unit stops. Unit doesn't operate normal operation in COOL or HEAT mode. 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" on page 67 or 68. Refer to D "Check of outdoor unit" on page 6 or 6. Refer to E "Check of outdoor unit" on page 6. Refer to F "Check of R.V. coil" on page 6. Refer to B "Check of remote controller and receiver P.C. board" on page 59.. Check indoor / outdoor connecting wire.. Refer to C "Check of indoor electronic control P.C. board" on page 60. Flash on and off at 0.5- second intervals Cause: Indoor/ Outdoor unit Mis-wiring MSH-RV only -time flash Cause: Outdoor / Indoor unit Trouble of serial signal -time flash Cause: Indoor unit Trouble of room temperature/ indoor coil thermistor -time flash Cause: Indoor unit Trouble of indoor fan motor MSH-RV only 4-time flash Cause: Indoor unit Trouble of indoor unit control system 6-time flash Cause: Outdoor unit Trouble of thermistor in outdoor unit 7-time flash Cause: Outdoor unit Trouble of outdoor control system MSH-RV only 0-time flash Cause: Outdoor unit Trouble of low discharge temperature protection Refer to H "How to check mis-wiring (When outdoor unit doesn't work)" on page 65. Refer to G "How to check miswiring and serial signal error (When outdoor unit doesn't work)" on page 64. W Check room temperature thermistor and indoor coil thermistor. Refer to "Test point diagram and voltage" on page 67 or 68. Refer to A "Check of indoor fan motor" on page 59. Replace the indoor electronic control P.C. board. Refer to J "Check of outdoor thermistor" on page 66. Replace the deicer P.C. board. 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. Refer to I "Check of LEV" on page

55 . Troubleshooting check table MSH-8RV The following indication does not depend on the shape of lamp. flashing Operation Indicator Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible abnormalities. The OPERATION INDICATOR lamp (on the left-hand side) is lighting during normal operation. Before taking measures, make sure that the symptom reappears, for accurate troubleshooting. Self check table Abnormal NO. point Indication Symptom Detect method Check point Mis-wiring Serial signal 0.5-second ON 0.5-second OFF -time flash Outdoor unit does not run. When serial signal stops for 4 to 5 seconds after st on of 5C relay by POWER turning on. When serial signal from outdoor unit stops for 4 to 5 seconds. Check wiring (visual check and conductivity check). Check indoor electronic control P.C.board. Check outdoor DEICER P.C. board. Check electrical parts..5-second OFF Indoor coil thermistor Room temperature thermistor -time flash.5-second OFF Outdoor unit does not run. Detect Indoor coil/room temperature thermistor short or open circuit every 8 seconds during operation. Check resistance of thermistor. Re-connect connector. Check indoor electronic control P.C.board. Indoor fan motor -time flash.5-second OFF Indoor fan motor repeats seconds ON and minutes OFF. When the indoor fan breaks, the fan motor keeps stopping. When rotational frequency feedback signal is not emit during -second indoor fan operation. Disconnect connector CN and then check connector CN - to make sure rotational frequency feedback signal of.5v or over exists. Check indoor electronic control P.C. board. Check indoor fan motor. Re-connect connector. 6-time flash 4 Defrost thermistor.5-second OFF Outdoor unit does not run When the defrost thermistor shorts or opens after the compressor start-up. Check outdoor DEICER P.C. board. Check resistance of thermistor. Re-connect connector. 5 Outdoor power system 5-time flash.5-second OFF Outdoor unit does not run When the compressor operation is continuously three times Check the inverter output. interrupted by over current Check the compressor. protection within minute after start-up, it stops operation. 6 Outdoor control P.C. board 7 8 Outdoor refrigerant system error MXZ-NV MXZ-RV only Outdoor control P.C. board 7-time flash 0-time flash Operation Indicator lighted flashing.5-second OFF.5-second OFF.5-second OFF Outdoor unit does not run Outdoor unit does not run Outdoor unit runs but the indoor unit does not run. When it cannot properly read data in the nonvolatile memory Check the outdoor control P.C.board. of the outdoor control P.C.board. When the compressor operation has been interrupted by Amount of gas. LEV protection continuously 5 Check the outdoor control P.C. board. minutes, the compressor stops Contact of LEV board connectors. operation. When the operation mode of each indoor unit is differently set to COOL(includes DRY) and HEAT at same time, the operation mode of indoor unit that has operated at first has the priority. Unify the operation mode. The indication is shown only when the indoor unit connects with the outdoor unit MXZ-NV- E, E, MXZ-RV- E and MXZ-SV- E 55

56 MSH-/RV The following indication does not depend on the shape of lamp. flashing Flashing of the OPERATION INDICATOR lamp (on the left-hand side) indicates possible Operation Indicator abnormalities. The OPERATION INDICATOR lamp (on the left-hand side) is lighting during normal operation. Before taking measures, make sure that the symptom reappears, for accurate troubleshooting. Self check table. Abnormal point Mis-Wiring Serial signal MSH-RV only Indoor coil thermistor Room temperature thermistor Indoor fan motor 0.5-second ON 0.5-second OFF -time flash.5-second OFF -time flash -time flash Operation indicator lamp Symptom Detection method Checkpoint.5-second OFF.5-second OFF Outdoor unit does not operate. Outdoor unit does not operate. Indoor fan repeats seconds ON and minutes OFF. When the indoor fan breaks, the fan keeps stopping. minutes after power supply turns ON, when serial signal is not received. When serial signal from outdoor unit stops for 4 to 5 seconds. Detect Indoor coil/room temperature thermistor short or open circuit every 8 seconds during operation. When rotational frequency feedback signal is not emitting during -second indoor fan operation. Refer to H "How to check mis-wiring " on page 65. Refer to G "How to check mis-wiring and serial signal error" on page 64. Refer to the characteristics of main indoor coil thermistor, sub indoor coil thermistor, and room temperature thermistor on page 67 or 68. Refer to A "Check of indoor fan motor" on page Indoor control system MSH-RV only 4-time flash.5-second OFF Outdoor unit does not operate. When it cannot properly read data in the nonvolatile memory of the indoor electronic control P.C. board. Replace the indoor electronic control P.C. board. 5 Outdoor thermistor 6-time flash.5-second OFF Outdoor unit does not operate. <Thermistor short> Thermistors are abnormal when they short after compressor start-up. <Thermistor open> Thermistors are abnormal when they open after compressor start-up. However, discharge temperature thermistor is abnormal when open circuit is detected more than 0 minutes after compressor start-up. Shortage of refrigerant Replace the deicer P.C. board. Refer to J "Check of outdoor thermistor" on page Outdoor control system 7-time flash.5-second OFF Outdoor unit does not operate. When it cannot properly read data in the nonvolatile memory of the deicer P.C. board, outdoor unit stops [and restarts minutes later(msh-rv only).] Replace the deicer P.C. board. 7 Low discharge temperature protection MSH-RV only 0-time flash.5-second OFF Outdoor unit does not operate. When discharge temperature has been 50: or less on cool operation, or has been 49: or less on heat operation for minutes. Refer to I "Check of LEV" on page 66. Check refrigerant circuit and refrigerant amount. NOTE : When the indoor unit has started operation and the above detection method has detected an abnormality (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with the OPERATION INDICATOR lamp flashing. 56

57 . Trouble criterion of main parts MSH-8RV - E MUH-8RV - E MSH-RV - MUH-RV - E Part name Room temperature thermistor (RT) Indoor coil thermistor (RT) Defrost thermistor (RT6) Check method and criterion Measure the resistance with a tester. (Part temperature 0 C ~ C) rmal 8kΩ ~ kω Measure the resistance with a tester. (Part temperature 0 C ~ 40 C) rmal 5kΩ ~ 60kΩ Abnormal Open or short-circuit Abnormal Open or short-circuit Figure Ambient temperature thermistor (RT6) MSH-RV only Measure the resistance with a tester. (Part temperature 0 C ~ 40 C) rmal 5kΩ ~ 60kΩ Abnormal Open or short-circuit Compressor (MC) Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 40 C) C-R C-S MSH-8RV 0.90Ω ~.Ω.79Ω ~.Ω rmal MSH-RV 0.84Ω ~.04Ω.8Ω ~.Ω Abnormal Open or short-circuit S WHT C P ~ AUX MAIN RED R BLK Indoor fan motor (MF) Motor part Measure the resistance between the terminals with a tester. (Part temperature0 C ~ C) WHT-BLK BLK-RED Measure the voltage Power ON. rmal 76Ω ~ 9Ω 0Ω ~ Ω Abnormal Open or short-circuit FUSE MAIN AUX Sensor part BRN-YLW YLW-GRY rmal 4.5 ~ 5.5V (When fan revolved one time) 0V 5V 0V (Approx.) Abnormal Remain 0V or 5V BLK BRN YLW GRY RED WHT Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 40 C) MSH-8RV MAIN AUX Outdoor fan motor (MF) WHT-BLK BLK-RED BLK-YLW YLW-RED rmal MSH-8RV MSH-RV 0Ω ~ Ω 55Ω ~ 68Ω 97Ω ~ Ω Ω ~ Ω 55Ω ~ 68Ω Abnormal Open or short-circuit P BLK RED ORN WHT MSH-RV MAIN AUX. AUX. P C BLK YLW RED ORN WHT Vane motor (MV) Measure the resistance between the terminals with a tester. (Part temperature0 C ~ C) rmal 58 ~ 88Ω Abnormal Open or short-circuit PNK ORN RED YLW ROTOR BLU 57 P :INNER PROTECTOR

58 MSH-RV - E MUH-RV - E Part name Room temperature thermistor(rt) Indoor coil thermistor (RT(main), RT(sub)) Defrost thermistor (RT6) Discharge temperature thermistor(rt6) Ambient temperature thermistor(rt6) Compressor(MC) Indoor fan motor(mf) Outdoor fan moter(mf) Horizontal vane motor(mv) Vertical vane motor(mv) R.V. coil(s4) LEV(Expansion valve) Check method and criterion Measure the resistance with a tester. (Part temperature 0 C ~ C) rmal 8 k" ~ k" Measure the resistance with a tester. (Part temperature 0 C ~ 40 C) Measure the resistance with a tester. (Part temperature 0 C ~ 40 C) Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 40 C) Terminal C R C S Color of lead wire WHT BLK BLK RED rmal 0.58 " ~ 0.7 ".9 " ~.70 " Abnormal Open or short-circuit Measure the resistance with a tester. Before measurement, hold the thermistor with your hands to warm it up. (Part temperature 0 C ~ 40 C) Motor part Sensor part rmal 5 k" ~ 60 k" rmal k" ~ 800k" rmal 5 k" ~ 60 k" Abnormal Open or short-circuit Abnormal Open or short-circuit rmal " ~ 44 " 5 " ~ 65 " Abnormal Open or short-circuit Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ C) Abnormal Open or short-circuit Measure the voltage power ON. Color of lead wire rmal Abnormal BRN YLW YLW GRY 4.5 ~ 5.5V (When fan revolved one time) 0V 5V 0V (Approx.) Remain 0V or 5V Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 40 C) Color of lead wire rmal Abnormal WHT BLK 55.4 " ~ 67.7 " Open or BLK YLW 49. " ~ 60. " short-circuit YLW RED.9 " ~ 8.0 " Measure the resistance between the terminal with a tester. (Part temperature0 C ~ C) rmal 8" ~ 6 " Abnormal Open or short-circuit Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 40 C) rmal.67 k" ~.8 k" Abnormal Open or short-circuit Measure the resistance with a tester. (Part temperature : 0 C ~ 40 C) Color of lead wire rmal WHT RED RED ORN. " ~ 7.0 " YLW BRN BRN BLU Abnormal Open or short-circuit Abnormal Open or short-circuit WHT C BLK Figure P AUX. MAIN S RED ORN RED BRN YLW GRY R BLK YLW RED WHT BLK YLW REDORNWHT PNK WHT6 RED ORN4 P MAIN AUX. MAIN AUX.AUX. C ROTOR YLW5 P LEV BRN BLU BLU P :INNER PROTECTOR 58

59 A Check of indoor fan motor Indoor fan motor doesn t operate. Turn OFF the power supply. Check connector CN visually. Are lead wires connected? Is soldered point normal? Re-solder it. Re-connect the lead wires. Disconnect lead wires from connector CN on the indoor electronic control P.C. board. Measure resistance between lead wires. and.4 and then. and.(msh-8/rv). {. and.4 and then. and.4(msh-rv). Is resistance 0 (short circuit) or (open circuit)? ( 0 or ) (others) Insert screwdriver into air outlet to rotate indoor fan motor slowly for revolution or over, and measure voltage between.(+) and.(-) on CN. Repair or replace the indoor fan motor. Does voltage repeat 0V DC and 5V DC? Replace the indoor electronic control P.C. board. B Check of remote controller and receiver P.C. board Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn t operate with the remote controller. w Check if the remote controller is exclusive for this air conditioner. Switch on the remote controller. Is LCD display on the the remote controller visible? (not clear) Replace the batteries.(refer to page 5.) Remove the batteries, then set them back and press the RESET button. Check if the unit operates with the remote controller. Does the unit operate with the remote controller? Turn on a radio to AM and press switch on the remote controller. OK Is noise heard from radio? Replace the remote controller. Are there any fluorescent lights of inverter or rapid-start type within the range of m? Re-install the unit away from lights. Attach a filter on receiving part. Measure the voltage between receiver P.C. board connector.(+) and. (MSH-8RV) / CN.(+) and.(-) (MSH-/RV) when the remote controller button is pressed. Is the voltage approx. 4V DC? (5V or 0V DC) Replace the indoor electronic control P.C. board. Replace the receiver P.C. board. 59

60 C Check of indoor electronic control P.C. board The unit doesn t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn t light up by pressing the EMERGENCY OPERATION switch. Check the both parts side and pattern side of indoor electronic control P.C. board visually. MSH-8/RV MSH-RV Varistor (NR) Turn OFF the power supply. Remove indoor fan motor connector CN and vane motor connector CN5 from the indoor electronic control P.C. board and turn ON the power supply. CN F L N Fuse (F) Does the unit operate with the remote controller? Does the OPERATION INDICATOR lamp light up by pressing the EMERGENCY OPERATION switch? Terminal block Indoor electronic control P.C. board Turn OFF the power supply. Replace the vane motor. Is winding resistance of vane motor 0 "? Be sure to check both resistance. Is winding resistance of fan motor 0 "? Replace the fan motor. Turn OFF the power supply. Replace the fuse. Is fuse(f) blown? Be sure to check both fuse and varistor in any case. Is varistor(nr) burnt? Replace the varistor. (MSH- 8/RV) (MSH-RV) Measure the resistance between CN on the indoor electronic control P.C. board and N on the terminal block with the tester. Replace the indoor electronic control P.C. board. Is resistance approx. 0"? ( ) Replace the fuse (F). D Check of outdoor unit Compressor and or outdoor fan motor doesn t operate. MSH-8RV Start Press the EMERGENCY OPERATION switch. -minute time delay works. Test run operation operates for minutes. Check the voltage to the terminal block of outdoor unit. Is there -0V AC to the terminal block between - N? Check the outdoor DEICER P.C.board at first, then check the outdoor fan motor and the compressor. Check the voltage to the terminal block of indoor unit. Is there -0V AC to the terminal block between - N? Check the continuity of indoor and outdoor unit connection. Replace the indoor electronic control P.C. board. 60

61 MSH-RV Start Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch. -minute time delay works. Test run operation operates for minutes. Compressor doesn't operate. Is there 5V DC between J0 + - J40 on the deicer P.C. board? w Is there -0V AC between CN7 - on the deicer P.C. board? w Replace the deicer P.C. board. Make the connection of wiring correct. Is there -0V AC between A-A on the compressor contactor(5c)? Replace the deicer P.C. board. Is there -0V AC between /T on the compressor contactor(5c) and N on the outdoor terminal block? Is there -0V AC between /L on the compressor contactor(5c) and N on the outdoor terminal block? Make the connection of wiring correct. Check the compressor. Replace the compressor contactor(5c). Outdoor fan motor doesn't operate. Is there 5V DC between J0 + - J40 on the deicer P.C. board? w Is there -0V AC between CN7 - on the deicer P.C. board? w Replace the deicer P.C. board. Make the connection of wiring correct. Is there -0V AC between CN7 - or - on the deicer P.C. board? w Replace the deicer P.C. board. Check the outdoor fan motor. Refer to page 57. w Refer to page 70. 6

62 MSH-RV Turn ON the power supply. Is there -0V AC to between L-N on the outdoor terminal block? Check the outdoor power supply and connection of wiring. Compressor does not operate. Is there 5V DC between J0 + - J40 on the deicer P.C. board? w Is there -0V AC between CN7 - on the deicer P.C. board? w Make the connection of wiring correct. Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch. Replace the deicer P.C. board. minutes after the power supply turns ON, is there -0V AC between A-A on the compressor contactor? Is there -0V AC between /T on the compressor contactor(5c) and N on the outdoor terminal block? Replace the deicer P.C. board. Is there -0V AC between /L on the compressor contactor(5c) and N on the outdoor terminal block? Make the connection of wiring correct. Check the compressor. Replace the compressor contactor(5c). Outdoor fan motor does not operate. Is there 5V DC between J0 + - J40 on the deicer P.C. board? w Is there -0V AC CN7 - on the deicer P.C. board? w Make the connection of wiring correct. Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch. Replace the deicer P.C. board. Is there -0V AC between CN7 - or - on the deicer P.C. board? w Replace the deicer P.C. board. Check the outdoor fan motor. Refer to page 58. w Refer to page 70. 6

63 E Check of outdoor unit <MSH-/RV only> Compressor and / or outdoor fan motor doesn t stop. Turn OFF the power supply. After seconds, turn ON the power supply again. Operate the unit in COOL or HEAT mode by pressing the EMERGENCY OPERATION switch. 4 Operate the unit for minute or more and stop it by pressing the EMERGENCY OPERATION switch again. After seconds, does compressor stop? Ok Is there -0V AC between A-A on the compressor contactor? Replace the deicer P.C. board. Is there -0V AC between /T on the compressor contactor and N on the outdoor terminal block? Replace the compressor contactor. Make the connection of wiring correct. After seconds, does outdoor fan motor stop? Replace the deicer P.C. board. Ok F Check of R.V. coil Unit operates COOL mode even if it is set to HEAT mode. w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit. Disconnect the TAB5 on the deicer P.C. board. Turn ON the power supply and operate the indoor unit in HEAT mode by pressing the EMERGENCY OPERATION switch. After minutes, is there -0V AC between CN7 - on the deicer P.C. board? Replace the R.V. coil. Replace the deicer P.C. board. Unit operates HEAT mode even if it is set to COOL mode. w First, measure the resistance of R.V. coil to confirm it is disconnected or is not short-circuit. Disconnect the TAB5 on the deicer P.C. board. Turn ON the power supply and operate the indoor unit in COOL mode by pressing the EMERGENCY OPERATION switch. After minutes, is there -0V AC between CN7 - on the deicer P.C. board? Replace the deicer P.C. board. Replace the R.V. coil. 6

64 G How to check mis-wiring and serial signal error <MSH-8/RV only> Outdoor unit doesn t operate. Start. Turn OFF the power supply.. Turn ON the power supply.. Press the EMERGENCY OPERATION switch. Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self-check to be displayed in seconds. min. later, when 5C contactor turns ON, what self-check result is displayed on OPERATION INDICATOR lamp on the indoor unit? Serial signal error is indicated. (0.5-sec.ON,.5-sec.OFF) Repair wiring. Is there mis-wiring, poor contact, or wire disconnection? Mis-wiring is indicated.(0.5-sec.on, 0.5-sec.OFF). Turn OFF the power supply and disconnect in-out connecting wire on the indoor side.. Short-circuit between indoor terminal block N and.. Turn ON the power supply and press the EMERGENCY OPERATION switch. Is there V DC between both ends of R when 5C contactor turns ON? ( By tester, the stylus is between 0 ~ V. ) Replace the indoor electronic control P.C. board.. Turn OFF the power supply.. Re-connect in-out connecting wire.. Turn ON the power supply. minutes later, when the EMERGENCY OPERATION switch is pressed and 5C contactor turns ON, is there -0V AC between the outdoor terminal block - N? Rectify in-out connecting wire. Is there 5V DC between J8 -J9 + (MSH-8RV)/ J0 + -J40 (MSH-RV) on the deicer P.C. board? Refer to page 69 or 70. Check and rectify the fuse and the varistor on the outdoor deicer P.C. board. Is there 0V DC between both ends of R60 on the deicer P.C. board? Refer to page 69 or 70. (By tester, the stylus is between 5 ~0V) Replace the deicer P.C. board. Rectify in-out connecting wire. While the serial signal error is indicated, 5C contactor alternates ON for about 0 seconds and OFF for minutes. Measure the voltage when 5C contactor is ON. 64

65 H How to check mis-wiring Outdoor unit doesn t operate. <MSH-RV only> w Short circuit of JPG and JPS on the indoor electronic control P.C. board enables self -check to be displayed in seconds. Start Turn ON the power supply. Press once EMERGENCY OPERATION switch. After minutes, mis-wiring is indicated (0.5-second ON, 0.5-second OFF) on OPERATION INDICATOR lamp on indoor unit.w Make them sure. Is this mis-wiring, poor contact, or wire disconnection?. Turn OFF the power supply and disconnect only terminal block of in-out connecting wire on indoor side.. Short-circuit terminal block N- by lead wire.. Turn ON the power supply and press once EMERGENCY OPERATION switch. Is there V DC between both ends of PS on the indoor electronic control P.C. board? ( By tester, the stylus is between 0 ~ V. ) Turn OFF the power supply. Disconnect the lead wire that terminal block N- is short-circuited. Connect ON in-out connecting wire. Replace the indoor electronic control P.C. board. Turn ON the power supply. Is there -0V AC between L-N on the outdoor terminal block? Is there 5V DC between J0 + -J40 - on the deicer P.C. board?(refer to page 70.) During EMERGENCY OPERATION, is there 0V DC between both ends of R60on the deicer P.C. board? (Refer to page 70.) (By tester, the stylus is between 5 ~0V) Replace the deicer P.C. board. Check the outdoor power supply and connection of wiring. Replace the deicer P.C. board. Make the wiring between CN7 on the deicer P.C. board and outdoor terminal block correct. (Refer to page 70.) 65

66 I Check of LEV (Expansion valve) <MSH-RV only> Heating/ Cooling doesn't operate. During pressing OPERATION SELECT button on remote controller, press RESET button. First, release RESET button. (Confirm all displays of remote controller.) Then release OPERATION SELECT button. During pressing OPERATION SELECT button on remote controller, press RESET button. First, release RESET button. With remote controller set toward the indoor unit, press OPERATE/ STOP(ON/ OFF) button and confirm one beep tone. LEV operates in full-opening direction. C CLOCK AMPM AMPM (Confirm all displays of remote controller.) Then release OPERATION SELECT button. Do you hear LEV "click, click "? Do you touch LEV and feel it vibrate? Ok Characteristics of LEV coil Is LEV coil properly fixed to the body? Does the resistance of LEV coil have the characterictics? Properly fix LEV coil to the body. Replace the deicer P.C. board. LEV (CN7) WHT RED RED ORN YLW BRN BRN BLU Resistance. " ~ 7.0 " Replace the LEV coil. NOTE : After check of LEV, do the undermentioned operations.. Turn OFF the power supply of the unit and turn ON again.. Press the RESET button on the remote controller. J Check of outdoor thermistor Thermistors in the outdoor unit are abnormal. w Disconnect the connectors CN66 and/ or CN66 from the deicer P.C. board. (Check the characteristics of each thermistor.) Defrost thermistor(rt6) Measure resistance between CN 66 and. Turn OFF the power supply. <MSH-RV only> Discharge temperature thermistor(rt6) Measure resistance between CN 66 and. Does the resistancs of thermistor have the characteristics on page 69 or 70? Connect CN66 and CN66. Turn ON the power supply and press the EMERGENCY OPERATION switch. Replace the deicer P.C. board. Does the unit operate 0 minutes or more? <MSH-/RV only> Ambient temperature thermistor(rt6) Replace the thermistor. Ok W. Measure resistance between CN 66 and 4. W. It is thought defective contact of the connector. 66

67 TEST POINT DIAGRAM AND VOLTAGE MSH-8RV - E MSH-RV - E Indoor electronic control P.C. board Fan motor power supply Fuse(F) 50V AC.5A } Power supply input -0V AC + C44 } 5V DC C44 Room temperature thermistor(rt) Indoor coil thermistor(rt) Timer short mode point (JPS, JPG) (Refer to page 50.) Emergency operation switch JPG V DC +} JP4 R 0~V DC How to set Auto restart function Cut the Resistor JR06. (Refer to page 5.) Resistance(k") P.C.board 67

68 TEST POINT DIAGRAM AND VOLTAGE MSH-RV - E Indoor electronic control P.C. board Fan motor power supply } Power supply input -0V AC + } 5V DC Fuse (F) 50V AC.5A PS Room temperature thermistor(rt) Indoor coil thermistor(rt(main)) Indoor coil thermistor(rt(sub)) Emergency operation switch Timer short mode point (JPS, JPG) (Refer to page 50.) + } V DC Indoor coil thermistor(rt(main), RT(sub)) Room temperature thermistor (RT) How to set Auto restart function Cut the Resistor JR07. (Refer to page 5.) Resistance(k") 68

69 MUH-8RV - E Outdoor deicer P.C. board Outdoor fan motor -0V AC } R.V. coil -0V AC } R60 5~0V DC(Refer to page 64.) + } -0V AC } CN66 - Defrost thermistor (RT6) (Refer to page 66.) } Fuse A/50V Defrost interval time short pin (JP607,R85) (Refer to page 50.) + J9 J8} 5V DC (Refer to page 64.) + } V DC + } 5C V DC Jumper wire for change in defrost setting (JPC, JPE) (Refer to page 50.) 69

70 MUH-RV - E MUH-RV - E Outdoor deicer P.C. board Defrost thermistor (RT6) Ambient temperature thermistor (RT6) Resistance(k") Temperature(:) Resistance(k") Discharge temperature thermistor(rt6) Temperature(:) CN66 - Defrost thermistor (RT6) (Refer to page 66.) <MSH-RV only> CN66 - Discharge temperature thermistor (RT6) (Refer to page 66.) CN66-4 Ambient temperature thermistor (RT6) (Refer to page 66.) LEV connector (CN7) Fan motor connector (CN7) Varistor (NR6) } R.V. coil (CN7) Defrost interval time short pin(jpg, R87) (Refer to page 50.) J0 + 5V DC J40 (Refer to page 6, 6 or 65.) } Jumper wire for change in defrost setting (JRF, JRG) (Refer to page 50.) + + } V DC Fuse.5A / 50V Varistor (NR6) } CN7- -0V AC (Refer to page 6 or 6.) } R60 0V DC (Refer to page 64 or 65.) 70

71 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 ()) 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. () The terminal with this connector is a terminal with lock mechanism Sleeve Locking lever Slide the sleeve. Pull the terminal while pushing the locking lever. Connector Hold the sleeve, and pull out the terminal slowly. -. MSH-8RV - E MSH-RV - INDOOR UNIT OPERATING PROCEDURE E PHOTOS. Removing the front panel () Remove the screw caps at the down of the front panel. Remove the screws. () Pull the panel down to your side slightly and unhook the catches at the top. Photo Front panel Screws. Removing the electronic control P.C. board, the receiver P.C. board and the display P.C. board () Remove the front panel. (Refer to ) () Remove the electrical cover. () Remove the screw of the terminal cover. (4) Remove the screw of the terminal block. (5) Unhook the catch of the lamp holder. (6) Remove the receiver holder and the receiver P.C. board. (7) Remove the screw of the ground wire. (8) Disconnect all the connectors and all the lead wires on the electronic control P.C. board. (9) Remove the electronic control P.C. board and display P.C. board. Photo Screw of the ground wire Indoor coil thermistor Screw of the terminal block Indoor electronic control P.C. board Lamp holder Display P.C. board Receiver P.C. board Receiver holder 7

72 OPERATING PROCEDURE. Removing the electrical box () Remove the front panel. (Refer to ) () Remove the electrical cover. () Disconnect the connector of the indoor coil thermistor. (4) Disconnect the motor connector (CN and CN) and the vane motor connector (CN5) on the electronic control P.C. board. (5) Remove the screw of the electrical box, remove the electrical box. Photo PHOTOS Screw of the electrical box 4. Removing the indoor fan motor and the line flow fan () Remove the front panel. () Remove the electrical box. () Unhook the catches on the both sides of the nozzle assembly. (4) Remove the nozzle assembly. (5) Remove the screws of the bearing support. (6) Remove the screw of the heat exchanger unhook the catch. (7) Lifting the heat exchanger, remove the bearing support. (8) Loose the screw fixing the line flow fan, remove the line flow fan. (9) Remove the screws of the motor band, remove the fan motor. Photo 4 Catch Screw of the heat exchanger Screw of the bearing support Heat exchanger Photo 5 Indoor fan motor Screws of the motor band Line flow fan Screw of the motor band 7

73 -. MSH-RV - E INDOOR UNIT OPERATING PROCEDURE. Removing the front panel () Remove the screws caps of the front panel. Remove the screws. () Pull the panel down to your side slightly and unhook the catches at the top. Photo PHOTOS Front panel Screws. Removing the electronic control P.C. board, the receiver P.C. board and the display P.C. board () Remove the front panel. (Refer to ) () Remove the screw of the electrical cover. Remove the electrical cover. () Remove the screw of the V.A. clamp. Remove the V.A. clamp. (4) Remove the screw of the terminal block. (5) Remove the screw of the ground wire. (6) Disconnect all the connectors and all the lead wires on the electronic control P.C. board. (7) Remove the R.L holder. (8) Remove the electronic control P.C. board. (9) Open the R.L holder, remove the receiver P.C. board and the display P.C. board. Photo Screws of the ground wire R.L holder Screw of the terminal block Receiver P.C. board Fan motor connectors Vane motor connector Indoor electronic control P.C.board Screw of the electrical cover Screw of the V.A. clamp 7

74 OPERATING PROCEDURE. Removing the electrical box () Remove the front panel. (Refer to ) () Remove the electrical cover. (Refer to ) () Disconnect the connector of the indoor coil thermistor. (4) Disconnect the motor connector (CN and CN) and the vane motor connector (CN5) on the electronic control P.C. board. (5) Remove the screw of ground wire. (6) Remove the fan motor lead wire and indoor coil thermistor from the electrical box. (7) Remove the lead wire of vane motor from the bottom of electrical box. (8) Remove the screw fixing the electrical box, remove the electrical box. Photo PHOTOS Screws of the ground wire Screw of the electrical cover Screw of the electrical box 4. Removing the vane motor () Remove the front panel. (Refer to ) () Remove the electrical cover. (Refer to ) () Remove the lead wire of vane motor.(refer to ) (4) Remove the R.L. holder. (5) Pull out the drain hose from the nozzle assembly, remove the nozzle assembly. (6) Remove the screws of the vane motor, disconnect the connector. (7) Remove the vane motor. Photo 5 Screw of the vane motor Photo 4 Vane motors Screws of the vane motor Vane motor 5. Removing the line flow fan and the indoor fan motor () Remove the front panel. (Refer to ) () Remove the electrical box. (Refer to ) () Pull out the drain hose from the nozzle assembly, remove the nozzle assembly. (4) Remove the water cut. (5) Slide the hole cover, remove the hole cover. (6) Remove the hexagon socket set screw from the line flow fan. (7) Remove the screws fixing the fan motor, remove the fan motor. (Be careful not to drop the fan motor because it is heavy.) (8) Remove the screws fixing the left side of the heat exchanger. (9) Lifting the left side of the heat exchanger. (0) Remove the line flow fan. Photo 8 Hole cover Photo 6 Screws fixing the left side of the heat exchanger Photo 7 Indoor coil thermistor Water cut Screws fixing the fan motor 74

75 -. MUH-8RV - E OUTDOOR UNIT OPERATING PROCEDURE PHOTOS. Removing the cabinet () Remove the screws of the cabinet. () Hold the down of the cabinet on the both side to remove the cabinet. Photo Photo Screws Screws Service panel. Removing the deicer P.C. board () Remove the service panel and the cabinet. () Disconnect all the connectors and the terminals on the deicer P.C. board. () Remove the deicer P.C. board. Photo Screws Deicer P.C. board Compressor capacitor Red lead wire White lead wire Black lead wire Terminal block 75

76 OPERATING PROCEDURE PHOTOS. Removing the outdoor fan motor () Remove the cabinet. (Refer to ) () Disconnect the connector remove the clamp of fan motor lead wire. () Remove the propeller fan nut and remove the propeller fan. (4) Remove screws fixing the fan motor. Photo 4 propeller fan Set screws of the outdoor fan motor Lead clamps Outdoor fan motor Propeller fan nut Set screws of the outdoor fan motor 4. Removing the compressor () Remove the cabinet. (Refer to ) () Remove the soundproof felt. () Remove the terminal cover on the compressor. (4) Remove the electrical assembly. (Refer to ) (5) Recover gas from the refrigerant circuit. (6) Disconnect the welded part of the discharge pipe. (7) Disconnect the welded part of the suction pipe. (8) Remove nuts fixing the compressor. (9) Remove the compressor. Photo 5 Discharge pipe Terminal cover Suction pipe Compressor Compressor nuts 76

77 -4. MUH-RV - E MUH-RV - OUTDOOR UNIT OPERATING PROCEDURE. Removing the cabinet () Remove the screws of the top panel and the top panel. () Remove the screw of the service panel. To remove the service panel, pull it down toward you and unhook the catches on the both sides. () Remove the screw of the cover panel. To remove the cover panel. (4) Remove the screws of the cabinet. Open the cabinet to a 45-degree angle. Then lift it and unhook the catches to remove. E NOTE: These photos use MUH-RV - E. MUH-RV - E is almost the same as MUH-RV - E. Photo PHOTOS Screws of the top panel Top panel Cabinet Service panel Cover panel Photo Screws of the cabinet. Removing the deicer P.C. board () Remove the top panel, the service panel and the cover panel. () Disconnect all the connectors and the terminals on the deicer P.C. board. () Remove the deicer P.C. board. Photo Terminal blocks Deicer P.C. board Compressor contactor. Removing the propeller fan and the outdoor fan motor () Remove the cabinet. (Refer to ) () Remove the propeller fan nut and the propeller fan. NOTE:Loose the propeller fan in the rotating direction for removal. When attaching the propeller fan, align the mark on the propeller fan and the motor shaft cut section. Set the propeller fan in position by using the cut on the shaft and the mark on the propeller fan. () Remove the screws and the outdoor fan motor and the connectors. Remove the outdoor fan motor. Photo 4 Propeller fan Propeller fan nut Motor support Separator support plate Separator Valve bed 77

78 OPERATING PROCEDURE PHOTOS 4. Removing the heat exchanger and compressor () Remove the screws of the rear panel. Remove the screws of the valve bed and the valve bed. (The valve bed is fixed by the catches on the right and left sides. Lift it to remove.) Open the rear panel to the rear to remove. NOTE : All panels are fixed by catches, and must be removed by up and down. () Remove the screws of the side panel and the side panel. () Remove the screws of the rear guard and the rear guard. (4) Remove the screws of the separator support plate and the separator support plate. (5) Remove the screws of the motor support and the motor support. (6) Remove the relay panel. Disconnect the fan motor lead wires. (7) Remove the soundproof felt. (8) Remove the screws of the separator and the separator. (9) Recover gas from the refrigerant circuit. (0) Remove the screws of the heat exchanger and the heat exchanger. Detach the welded part of pipe. () Remove the nuts of the compressor and the compressor. Detach the welded part of the suction pipe and the discharge pipe. Photo 5 Rear panel Screws Photo 6 Screws Rear guard Heat exchanger Side panel Accumulator Photo 7 Stop valve Compressor Sound proof felt 78

79 PARTS LIST MSH-8RV - E (WH) MSH-RV - E (WH) -. INDOOR UNIT STRUCTURAL PARTS -. INDOOR UNIT HEAT EXCHANGER 8 4 Optional parts (Seeback cover.) INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. NO. Part. Part Name Symbol in Wiring Diagram MSH-8RV- (WH) E INSTALLATION PLATE E0 4 4 BOX(WH) E FRONT PANEL ASSEMBLY(WH) 4 E GRILLE(WH) 5 E SCREW CAP(WH) 6 E AIR FILTER 7 E LAMP PANEL(WH) Q'ty/unit E MSH-RV- (WH) E Remarks Including 4,5 PCS/SET -. INDOOR UNIT HEAT EXCHANGER E0 4 6 E E E INDOOR HEAT EXCHANGER UNION(LIQUID) UNION(LIQUID) UNION(GAS) {6.5 {9.5 {

80 MSH-8RV - E (WH) MSH-RV - E (WH) -. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 6 SLEEVE BEARING 5-4. ACCESSORY AND REMOTE CONTROLLER PART Part numbers that are circled are not shown in the illustration. Symbol NO. Part. Part Name in Wiring Diagram E0 4 E E E E0 4 5 E E0 8 7 E0 4 E E0 95 E E E0 8 8 E E E E0 4 0 E0 0 E E0 8 9 E E0 7 8 E0 5 8 E0 9 8 E0 8 8 E INDOOR COIL THERMISTOR 8 LINE FLOW FAN SLEEVE BEARING BEARING MOUNT DRAIN HOSE NOZZLE(WH) VANE(WH) INDOOR COIL THERMISTOR VANE MOTOR POWER SUPPLY CORD POWER SUPPLY CORD TERMINAL BLOCK TERMINAL BLOCK ROOM TEMPERATURE THERMISTOR RECEIVER P. C. BOARD ELECTRONIC CONTROL P.C. BOARD ELECTRONIC CONTROL P.C. BOARD INDOOR FAN MOTOR INDOOR FAN MOTOR FAN MOTOR RUBBER MOUNT DISPLAY P.C. BOARD VARISTOR FUSE THERMAL FUSE THERMAL FUSE SURGE ABSORBER SURGE ABSORBER 9 0 ROOM TEMPERATURE THERMISTOR -. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS RT MV TB TB RT MF MF NR F F F DSAR DSAR Q'ty/unit MSH-8RV- E MSH-RV- (WH) (WH) E AUTO RESTART AUTO RESTART RA4V7 - RA4V7 - PCS/SET.5A 9: 9: Remarks -4. ACCESSORY AND REMOTE CONTROLLER PART E E REMOTE CONTROLLER REMOTE CONTROLLER HOLDER 80

81 MUH-8RV - E -5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS DEFROST THERMISTOR Part numbers that are circled are not shown in the illustration NO Part. E0 40 E0 4 E0 4 5 E0 9 6 E E E E E E E E0 4 5 E E E0 44 E E E0 440 E E E E E E0 8 8 E0 64 Part Name BACK PANEL CABINET GRILLE OUTDOOR HEAT EXCHANGER PROPELLER FAN MOTOR SUPPORT COMPRESSOR RUBBER SET COMPRESSOR BASE STOP VALVE(GAS) STOP VALVE(LIQUID) SERVICE PANEL 4-WAY VALVE COMPRESSOR CAPACITOR OUTDOOR FAN MOTOR TERMINAL BLOCK DEICER P.C. BOARD DEFROST THERMISTOR COMPRESSOR CONTACTOR CAPILLARY TUBE CAPILLARY TUBE FUSE R.V. COIL SURGE ABSORBER CHECK VALVE Symbol in Wiring Diagram MC C MF TB RT6 5C F6 S4 DSAR Q'ty/unit MUH-8RV- 4 E Remarks 4RUBBERS/SET PH-6VPET {5.88 { /4V AC RA6V50-4P {.0 { {.0 { V / A 8

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