MU09TW MU12TN MU15TN MU17TN

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1 SPLIT-TYPE AIR CONDITIONERS SERVICE MANUAL Wireless type Models (W) MSTN (W) MS5TN (W) MS7TN (W) MU09TW MUTN MU5TN MU7TN No. OB74 CONTENTS MSTN MS5TN MS7TN INDOOR UNIT MU5TN MU7TN OUTDOOR UNIT Remote controller. FEATURES OB74-. TECHNICAL CHANGES OB74-. PART NAMES AND FUNCTIONS OB SPECIFICATIONS OB DATA OB OUTLINES AND DIMENSIONS OB WIRING DIAGRAM OB REFRIGERANT SYSTEM DIAGRAM OB74-9. MICROPROCESSOR CONTROL OB74-0. SERVICE FUNCTIONS OB74-. TROUBLESHOOTING OB74-. DISASSEMBLY INSTRUCTIONS OB74-4. PARTS LIST OB OPTIONAL PARTS OB74-57 The Slim Line. From Mitsubishi Electric. TM C LIST ED R LIST ED R

2 FEATURES MU09TW MUTN LCD wireless remote controller MSTN MS5TN MS7TN MU5TN MU7TN Models Cooling capacity SEER 8,500Btu/h 0. MSTN,00/,600Btu/h./. MS5TN 4,00/4,600Btu/h 0.5/0.5 MS7TN 5,900/6,00Btu/h 0./0. I FEEL CONTROL IN OUR LCD WIRELESS REMOTE CONTROLLER WITH ON/OFF PROGRAM TIMER Mitsubishi Electric s new wireless remote controller incorporates a number of advanced features that provide even greater control and ease-to-use. It has a liquid crystal display which indicates such information as mode, fan speed and temperature selected as well as the programmed ON/OFF timer. It is also equipped with I Feel Control, a unique Mitsubishi Electric feature that allows the user to adjust the temperature to exactly the level he or she wants simply by tapping the button that describes present conditions : Too Cool or Too Warm. The optimum temperature set this way is then memorized for immediate recall whenever the air conditioner is used again. Select desired air flow direction. REMOTE-CONTROL OPERATION MODE Using the remote controller, you can select from five airflow settings to match room layout and the location of people. Also, you can set the vane to swing automatically. SWING AUTO-RESTART FUNCTION The auto restart function restarts the equipment automatically when power is restored following an outage. Operation resumes in the mode in which the equipment was running just before the outage. HIGH PERFORMANCE ROTARY COMPRESSOR The advanced design of Mitsubishi Electric s powerful and energy efficient rotary compressor results in lower operating costs and longer service life. OB74-

3 TECHNICAL CHANGES MS09NW. Indoor unit has changed. Remote controller has changed. MSNN MSTN. Remote controller has changed.. Union size of connect pipe for gas has changed. MS5NN MS5TN MS7NN MS7TN. Remote controller has changed. MU09NW MU09TW. Outdoor unit has changed. MUNN MUTN. Outdoor unit has changed. MU5NN MU5TN MU7NN MU7TN. Only model name has changed. OB74-

4 5 6 PART NAMES AND FUNCTIONS INDOOR UNIT Deodorizing filter(option) (gray sponge type) Grille Air inlet MSTN MS5TN MS7TN Air cleaning filter(option) (white bellows type) Front panel Air filter Remote control receiving section Horizontal vane Vertical vanes Remote controller Operation section (When the front panel is opened) Emergency operation switch Operation indicator lamp Receiving section MSTN MS5TN MS7TN MSTN MS5TN MS7TN Emergency operation switch ACCESSORIES MSTN MS5TN MS7TN Installation plate Installation plate fixing screw 4 x 5 mm(0.6 x 0.98 in.) Remote controller mounting hardware Fixing screw for.5 x 6 mm(0.4 x 0.6 in.) (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) OB74-4

5 OUTDOOR UNIT MU09TW MUTN MU5TN MU7TN Air inlet (back and side) Air inlet (back and side) Piping Drain hose Air outlet Air outlet Drain outlet OB74-5

6 REMOTE CONTROLLER MSTN MS5TN MS7TN Signal transmitting section Operation display section PM OPERATE /STOP (ON /OFF)button ON/OFF TOO WARM TOO COOL AM TEMPERATURE buttons Open the front lid. CLOCK PM AM ON/OFF TOO WARM TOO COOL FAN SPEED CONTROL button OPERATION SELECT button RESET button I FEEL COOL FAN DRY MODE FAN STOP VANE START HR. MIN. RESET CLOCK OFF-TIMER button ON-TIMER button HR. button MIN. button (TIME SET button) CLOCK SET button VANE CONTROL button OB74-6

7 W D H W D H W A A A A 4 SPECIFICATIONS Item Cooling capacity Power consumption EER [SEER] Model Btu/h 8, [0.] MSTN,00/,600,00/,0./. [./.] INDOOR UNIT MODEL MSTN External finish Power supply V, phase, Hz White 5,, 60 Max. fuse size (time delay)/ Disconnect switch 5 Min. ampacity Fan motor Airflow Low Med. High FAN Dry F.L.A CFM Moisture removal COOL Dry(Wet) CFM pt./h 66(8)-9(84)-7(6). 60(4)-95(4)-45(9). Sound level Low-Med.-High db(a) Cond. drain connection O.D. in. 5/8 in. -/ 9-5/6 Dimensions in. 7-/ 7-/ in. 0-5/6-5/8 Weight lb. 0 OUTDOOR UNIT MODEL External finish Power supply V, phase, Hz MU09TW 5,, 60 Munsell 5Y7/ MUTN 08/0,, 60 Max. fuse size (time delay) 5 Min. ampacity Fan motor F.L.A Compressor Model Winding resistance (at 68 F)" RH0WGJT C-R 0.85 C-S. RH67NHDT C-R.6 C-S. R.L.A Refrigerant control Sound level L.R.A db(a) Capillary tube in. 0-/ 0-/4 Dimensions in. 0-/ 0-/6 in. -/4 -/4 Weight REMOTE CONTROLLER Control voltage (by built-in transformer) REFRIGERANT PIPING Pipe size (Min. wall thickness) lb. 7 Wireless type V DC Not supplied (optional parts) Connection method Between the indoor & outdoor units Refrigerant charge (R) Refrigerant oil (Model) Notes : Test conditions are based on ARI 0/40 : Rating conditions (cooling) Indoor : 80-FDB, 67-FWB, Outdoor : 95-FDB, (75-FWB) : Rating conditions (cooling) Indoor : 80-FDB, 67-FWB, Outdoor : 8-FDB, 65-FWB Operating Range Liquid Gas Indoor Outdoor Height difference Piping length in. in. ft. ft. oz. /8 (0.085) Ib. oz. 9. (MS56) /4 (0.065) 84 Flared Flared Max. 5 Max. 49 / (0.085) Ib. 9 oz. 6. (MS56) Cooling Maximum Minimum Indoor intake air temperature 95-FDB, 7-FWB 67-FDB, 57-FWB Outdoor intake air temperature 5-FDB 67-FDB OB74-7

8 W D H W D H W A A A A Item Model MS5TN MS7TN Cooling capacity Power consumption EER [SEER] Btu/h 4,00/4,600,70/, /0.4 (0.5/0.5) 5,900/6,00,570/,600 0./0. (0./0.) INDOOR UNIT MODEL MS5TN MS7TN External finish Power supply V, phase, Hz White 5,, 60 Max. fuse size (time delay)/disconnect switch 5 Min. ampacity Fan motor F.L.A Airflow Low Med. High Dry CFM Moisture removal Wet CFM pt./h Sound level Low-Med.-High db(a) Cond. drain connection O.D. in. 5/8 in. 9-5/6 Dimensions in. 7-/ in. -5/8 Weight OUTDOOR UNIT External finish Power supply lb. V, phase, Hz MU5TN Munsell 5Y7/ 08/0,, 60 MU7TN Max. fuse size (time delay) 0 Min. ampacity Fan motor F.L.A Compressor Model Winding resistance (at 68 F)" RH07NHDT C-R.68 C-S.78 RHNHDT C-R.65 C-S.67 R.L.A Refrigerant control Sound level L.R.A db(a) Capillary tube in. -7/6 Dimensions in. -7/6 in. -/6 Weight REMOTE CONTROLLER Control voltage (by built-in transformer) REFRIGERANT PIPING Pipe size Liquid (Min. wall thickness) Gas Indoor Connection method Outdoor Between the indoor Height difference & outdoor units Piping length Refrigerant charge (R) Refrigerant oil (Model) Notes : Test conditions are based on ARI 0/40 lb. in. in. ft. ft. oz. 9 Ib. 4 oz. Wireless type V DC Not supplied (optional parts) /4 (0.065) 5/8 (0.05) Flared Flared Max. 5 Max (MS56) : Rating conditions (cooling) Indoor : 80-FDB, 67-FWB, Outdoor : 95-FDB, (75-FWB) : Rating conditions (cooling) Indoor : 80-FDB, 67-FWB, Outdoor : 8-FDB, 65-FWB Operating Range 97 Ib. Cooling Maximum Minimum Indoor intake air temperature 95-FDB, 7-FWB 67-FDB, 57-FWB Outdoor intake air temperature 5-FDB 67-FDB OB74-8

9 A 0 MAX. REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE Model Additional piping Max. length : ft. Outside diameter Piping size : in. Gas Liquid Minimum Wall thickness Outside diameter Minimum Wall thickness Length of connecting pipe : in. Indoor unit Outdoor unit MU09TW MSTN MUTN MS5TN MU5TN MS7TN MU7TN 49 [ /8 [ / [ 5/ [ / Gas :6-5/6 Liquid : 9-/6 Gas : Liquid : 0 MAX. HEIGHT DIFFERENCE Indoor unit w Height difference should be within 5ft regardless of which unit, indoor or outdoor position is high. w Max. Height difference 5ft Additional Piping Max. length A Outdoor unit OB74-9

10 5 DATA 5-. PERFORMANCE DATA ) COOLING CAPACITY MSTN MS5TN MS7TN MU09TW MUTN MU5TN MU7TN (5V) Indoor air Outdoor intake air DB temperature ( F) Model IWB ( F) TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC (08V) Indoor air Outdoor intake air DB temperature ( F) Model IWB ( F) TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC MSTN MS5TN MS7TN (0V) Indoor air Outdoor intake air DB temperature ( F) Model IWB ( F) TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC MSTN MS5TN MS7TN Notes. IWB : Intake air wet-bulb temperature. TC : Total Capacity (x0 Btu/h), SHC : Sensible Heat Capacity (x0 Btu/h) TPC : Total Power Consumption (kw). SHC is based on 80 Fof indoor intake air DB temperature. ) COOLING CAPACITY CORRECTIONS Model Refrigerant piping length (one way) 5ft (std) 40ft 49ft MSTN MS5TN MS7TN OB74-0

11 5-. PERFORMANCE CURVE NOTE : A point on the curve shows the reference point. Curves in graph of MS(MU)/5/7TN shows curves under 0V AC. As for curves under 08V AC, refer to PERFORMANCE DATA on page 0. MU09TW Cooling SHF at rating condition = 0.70 Airflow = 6CFM Bypass Factor = 0.6 MSTN MUTN 6 Cooling SHF at rating condition = 0.7 Airflow = 9CFM Bypass Factor = 0.7 Total power consumption (kw) Total capacity ( o0 Btu/h) Indoor intake air WB temperature (-F) Indoor intake air WB temperature (-F) Total power consumption (kw) Total capacity ( o0 Btu/h) 4 0 Indoor intake air WB temperature (-F) Indoor intake air WB temperature (-F) Outdoor intake air DB temperature (-F) Outdoor intake air DB temperature (-F) MS5TN MU5TN MS7TN MU7TN 8 Cooling SHF at rating condition = 0.65 Airflow = 67CFM Bypass Factor = 0. 0 Cooling SHF at rating condition = 0.65 Airflow = 47CFM Bypass Factor = 0. Total power consumption (kw) Total capacity ( o0 Btu/h) 6 4 Indoor intake air WB temperature (-F) Indoor intake air WB temperature (-F) Outdoor intake air DB temperature (-F) Total power consumption (kw) Total capacity ( o0 Btu/h) Indoor intake air WB temperature (-F) Indoor intake air WB temperature (-F) Outdoor intake air DB temperature (-F) OB74-

12 5-. Condensing pressure Data is based on the condition of indoor humidity 50%. Air flow should be set at High. A point on the curve shows the reference point. MU09TW (PSIG) (PSIG) 00 Condensing pressure Indoor DB temperature Suction pressure Indoor DB temperature MUTN ( F) Outdoor ambient temperature ( F) Outdoor ambient temperature (PSIG) 00 Condensing pressure Indoor DB temperature Suction pressure (PSIG) Indoor DB temperature ( F) Outdoor ambient temperature Outdoor ambient temperature 04( F) OB74-

13 MU5TN Data is based on the condition of indoor humidity 50%. Air flow should be set at High. A point on the curve shows the reference point. (PSIG) 0 00 Condensing pressure Indoor DB temperature (PSIG) Suction pressure Indoor DB temperature ( F) Outdoor ambient temperature ( F) Outdoor ambient temperature MU7TN (PSIG) 0 00 Condensing pressure Indoor DB temperature Suction pressure (PSIG) Indoor DB temperature ( F) Outdoor ambient temperature ( F) Outdoor ambient temperature OB74-

14 A A A 5-4. STANDARD OPERATION DATA Model MSTN MS5TN MS7TN Item Unit Cooling Cooling Cooling Cooling Capacity Btu / h 8,500,00/,600 4,00/4,600 5,900/6,00 Total SHF Input kw /..7/.40.57/.60 INDOOR UNIT MODEL MSTN MS5TN MS7TN Power supply (V, phase, Hz) 5,, 60 5,, 60 5,, 60 5,, 60 Input kw Fan motor current Electrical circuit OUTDOOR UNIT MODEL MU09TW MUTN MU5TN MU7TN Power supply (V, phase, Hz) 5,, 60 08/0,, 60 08/0,, 60 08/0,, 60 Input kw /.08./.5.56/.546 Comp. current / / /6.4 Fan motor current / Condensing pressure PSIG Suction pressure PSIG Discharge temperature F Refrigerant circuit Condensing temperature Suction temperature F F Comp. shell bottom temp F Ref. pipe length ft Refrigerant charge (R) Ib. oz. Ib. 9 oz. Ib. 4 oz. Ib. Intake air temperature DB F WB F Indoor unit Discharge air temperature DB F WB F Fan speed (High) rpm 890,00,00,90 Airflow (High) CFM 6(Wet) 9(Wet) 67(Wet) 47(Wet) Outdoor unit Intake air temperature Fan speed DB WB F F rpm / / /900 Airflow POWER SUPPLY INDOOR UNIT 5V 60Hz [, wires INDOOR UNIT CFM 5V 60Hz [, wires 985 MS/5/7TN INDOOR UNIT 974/,04 5V 60Hz [, wires,4/,40 MS/5/7TN INDOOR UNIT,88/,94 SIGNAL WIRE wires V DC DISCONNECT SWITCH SIGNAL WIRE wires V DC 5V 60Hz [, wires SIGNAL WIRE wires V DC DISCONNECT SWITCH SIGNAL WIRE wires V DC 5V 60Hz [, wires 5V 5V 60Hz [, wires 5V 60Hz [, wires 08/0V 60Hz [, wires 08/0V 60Hz [, wires OUTDOOR UNIT OUTDOOR UNIT OUTDOOR UNIT OUTDOOR UNIT Both wirings can be applied to all MODELS. Outline of MUTN is as same as one of MU09TW. Control voltage Power supply voltage to serial signal circuit is V DC. Voltage between + and -- on in-out terminal block will be V DC peak. OB74-4

15 OPERATING RANGE () POWER SUPPLY Model Rating Guaranteed Voltage Indoor unit MSTN MS5TN 5V 60Hz [ Min. 0V 5V Max. 7V MS7TN MU09TW Outdoor unit MUTN MU5TN MU7TN 08/0V 60Hz [ Min. 98V 08V 0V Max. 5V () OPERATION Function Condition Intake air temperature DB (-F) Indoor WB (-F) DB (-F) Outdoor WB (-F) Standard temperature Cooling Maximum temperature Minimum temperature Maximum humidity 78% 5-6. OUTLET AIR SPEED AND COVERAGE RANGE Model MSTN MS5TN MS7TN Mode FAN COOL FAN COOL FAN COOL FAN COOL Function Dry Dry Wet Dry Wet Dry Wet Dry Wet Air flow (CFM) Air speed (ft./sec.) Coverage range (ft.) The air coverage range is the figure up to the position where the air speed is ft./sec., when air is blown out horizontally from the unit properly at the High speed position. The coverage range should be used only as a general guideline since it varies according to the size of the room and furniture arranged in the room ADDITIONAL REFRIGERANT CHARGE (R(oz.)) Model Outdoor unit precharged (up to 5ft.) 5ft. Refrigerant piping length (one way) 0ft. 5ft. 40ft. 45ft. 49ft. MSTN MS5TN MS7TN MU09TW MUTN MU5TN MU7TN Ib. oz. Ib. 9 oz. Ib. 4 oz. Ib. 0.5 (/).06 ().59 (/). ().54 (5/) CALCULATION : Xoz. = 0.5/ 5oz./ft. x (Additional Piping Length-5) ft. OB74-5

16 6 OUTLINES AND DIMENSIONS INDOOR UNIT -/6-5/6 6-5/8 Installation plate Indoor unit 9-/8-5/8 /8-5/8 0-/6 /6 Unit : inch -/4 -/6 -/6 4-5/8 0-5/6 -/ Air in /4 or more 7-7/6 Wall hole [-9/6 /6 Installation plate { Liquid line [/4 9-/6 Gas line [/8 6-5/6 Insulation [-7/6 O.D [/6 I.D -/4-5/6 4-/4 /4 6-/ -5/6-5/8 Drain hose [5/8 (Connected part O.D) Air out -/6 Insulation [-/8 6-/8 Wireless remote controller MU09TW MUTN OUTDOOR UNIT REQUIRED SPACE Outdoor unit 4 in. or more 4 in. or more 4 in.or more 6 in. or more 4-9/ -/4 Air in Air in -9/ 0-/ -7/ -9/ Service panel Lock nut 4 in. or more Connector Drainage holes [-5/6 5-5/ 4-/ Airout / Service panel Grounding terminal Conduit cover NOTE: Do not wire V DC and 5V AC in same conduit hole. -/4 0-/4 6-/ -7/ 4-5- Liquid refrigerant pipe joint Refrigerant pipe (flared) [/4 / -9/6 4-/6 9-/ 0-/ -9/ 4-/ Gas refrigerant pipe joint Refrigerant pipe (flared) [/8 (MU09TW) [/ (MUTN) OB74-6

17 MSTN MS5TN MS7TN INDOOR UNIT 9-/6 -/8-9/6 4holes 7/6 O /6 Indoor unit 5-7/8 5-/ 8-9/6 /6 7-/6 7-/6 7-/4-7/8-5/6 /4 6-/8 4 in. Unit : inch -5/8 9-5/6 Installation plate Wall hole [-5/6 Air in 7-/ /6 Installation plate { 0-/6 0 /8 -/6 Liquid line [ 5/6 9-/6 Gas line [/ 6-5/6 Insulation [ -5/6 O.D [ -/8 I.D -5/6 0-/ 7-/ Air out Drain hose [ 5/8 Insulation [ -/8 MU5TN MU7TN OUTDOOR UNIT Wireless remote controller 9-/4-7/ -/8 Drainage hole [5/8 Air in -/ -/4 /6 Air in -7/6 -/6-9/6 4 in. 4 in. Drainage holes [-5/6 Air out -5/6 -/6 0 in. Service panel 4 in. Liquid refrigerant pipe joint -/6 Refrigerant pipe (flared) [/4 Lock nut -/ /6 7-/6 9-/6-7/6 6-/6-5/6-5/6 OB /6 0 5 Gas refrigerant pipe joint Rfrigerant pipe (flared) [5/8 Connector Conduit cover NOTE: Do not wirev DC and 5V AC in same conduit hole.

18 7 WIRING DIAGRAM INDOOR UNIT MODEL WIRING DIAGRAM TO OUTDOOR UNIT CONNECTING WIRES V DC FROM OUTDOOR UNIT CONNECTING WIRES POWER SUPPLY 5V phase 60Hz ( ) W TB - + N L YLW VLT BLK RED CN 5 CN0 CN0 TAB LD0T HIC TRANS F NR SR4 ELECTRONIC CONTROL P.C. BOARD C CN CN CN CN RT RT BLK GRY YLW BRN WHT RED MF TO OUTDOOR UNIT CONNECTING WIRE 5 5 W A disconnect may be required by local code. MV POWER MONITOR, RECEIVER P.C.BOARD REMOTE CONTROLLER SYMBOL SYMBOL SYMBOL NAME NAME NAME C F INDOOR FAN CAPACITOR FUSE (A) MV NR VANE MOTOR VARISTOR SR4 TB SOLID STATE RELAY TERMINAL BLOCK HIC MF MU09TW DC / DC CONVERTER INDOOR FAN MOTOR (INNER FUSE) OUTDOOR UNIT MODEL WIRING DIAGRAM GROUND POWER SUPPLY 5V phase 60Hz TO INDOOR UNIT CONNECTING WIRES 5V Phase 60Hz FROM INDOOR UNIT CONNECTING WIRES V DC FROM INDOOR UNIT CONNECTING WIRE RT RT 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 TB GRN/YLW N L TB L N ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR RED + VLT YLW BLK RED BLK 5C NO 5C COM WHT WHT C C RED MC S BLK C RED BLK WHT RED BLK WHT R MF SG79J0H0 SYMBOL NAME SYMBOL NAME SYMBOL NAME C C COMPRESSOR CAPACITOR OUTDOOR FAN CAPACITOR NOTE:. About the indoor side electric wiring, refer to the indoor unit electric wiring diagram for servicing.. Use copper conductors only.(for field wiring). Symbols below indicate; : Terminal block, : Connector OB74-8 MC MF COMPRESSOR (INNER PROTECTOR) OUTDOOR FAN MOTOR (INNER PROTECTOR) TB,TB 5C TERMINAL BLOCK COMPRESSOR CONTACTOR VG79B009H0

19 MSTN MS5TN MS7TN INDOOR UNIT TO OUTDOOR UNIT CONNECTING WIRES V DC FROM OUTDOOR UNIT CONNECTING WIRES POWER SUPPLY 5V phase 60Hz ( ) TO OUTDOOR UNIT CONNECTING WIRE W TB - YLW + N L BRN VLT BLK RED DSAR MODELS WIRING DIAGRAM CN0 CN 0 CN0 TAB CN 5 5 CN 04 F CN 0 HIC TRANS 5 NR CN CN LDCOM LDC C LDC LDFH SR44 LDFL SR4 LDFM SR4 ELECTRONIC CONTROL P.C. BOARD RT RT WHT ORN RED BLK 4 YLW 5 BLU WHT ORN RED BLK YLW BLU BRN GRN/YLW MF GRN/YLW DISPLAY P.C.BOARD W A disconnect may be required by local code. MV AUTO RESTART ASSY RECEIVER P.C.BOARD REMOTE CONTROLLER SYMBOL SYMBOL SYMBOL NAME NAME NAME C INDOOR FAN CAPACITOR MF INDOOR FAN MOTOR (INNER FUSE) RT INDOOR COIL THERMISTOR DSAR F HIC MUTN SURGE ABSORBER FUSE (A) DC / DC CONVERTER OUTDOOR UNIT GROUND POWER SUPPLY 08/0V phase 60Hz TO INDOOR UNIT CONNECTING WIRES 5V Phase 60Hz FROM INDOOR UNIT CONNECTING WIRES V DC FROM INDOOR UNIT CONNECTING WIRE VANE MOTOR VARISTOR ROOM TEMPERATURE THERMISTOR 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 MODEL WIRING DIAGRAM TB GRN/YLW L N L TB L N + _ BLK RED VLT YLW BLU RED 5C OB74-9 NO COM 5C NOTE:. About the indoor side electric wiring, refer to the indoor unit electric wiring diagram for servicing.. Use copper conductors only.(for field wiring). Symbols below indicate; : Terminal block, : Connector MV NR RT SR4~SR44 SOLID STATE RELAY TB TERMINAL BLOCK WHT WHT C RED BLU WHT C C RED MC S BLK R RED BLK MF WHT VG79B05H0 SYMBOL NAME SYMBOL NAME SYMBOL NAME C COMPRESSOR CAPACITOR MC COMPRESSOR(INNER PROTECTOR) TB,TB TERMINAL BLOCK C OUTDOOR FAN CAPACITOR MF OUTDOOR FAN MOTOR(INNER PROTECTOR) 5C COMPRESSOR CONTACTOR VG79B00H0

20 MU5TN MU7TN OUTDOOR UNIT GROUND POWER SUPPLY 08/0V phase 60Hz FROM INDOOR UNIT CONNECTING WIRES 5V Phase 60Hz FROM INDOOR UNIT CONNECTING WIRES V DC MODELS WIRING DIAGRAM TB GRN/YLW L N L L TB N + - RED VLT YLW BLK BLU 5C RED NO COM 5C WHT C C RED S BLK BLU WHT ORN RED 4 C MC BLK WHT ORN RED R MF FROM INDOOR UNIT CONNECTING WIRE SYMBOL NAME SYMBOL NAME SYMBOL NAME C COMPRESSOR CAPACITOR MF OUTDOOR FAN MOTOR (INNER PROTECTOR) 5C COMPRESSOR CONTACTOR C OUTDOOR FAN CAPACITOR TB TERMINAL BLOCK MC COMPRESSOR (INNER PROTECTOR) TB TERMINAL BLOCK NOTES:. About the indoor side electric wiring, refer to the indoor unit electric wiring diagram for servicing.. Use copper conductors only.(for field wiring) SG79B999H0. Symbols below indicate; :Terminal block, :Connector OB74-0

21 8 REFRIGERANT SYSTEM DIAGRAM INDOOR UNIT Unit:inch MU09TW OUTDOOR UNIT Refrigerant pipe /8 (option) (with heat insulator) Stop valve with service port Indoor heat exchanger Indoor coil thermistor RT Flared connection Service port Fusible plug Service port Compressor Outdoor heat exchanger Room temperature thermistor RT Strainer Muffler Flared connection Stop valve Refrigerant pipe /4 (option) (with heat insulator) Capillary tube O.D. 0. o I.D o -5/8 Flow of refrigerant MSTN INDOOR UNIT Refrigerant pipe / (option) (with heat insulator) MUTN OUTDOOR UNIT Indoor heat exchanger Indoor coil thermistor RT Distributor Flared connection Stop valve with service port Service port Fusible plug Service port Outdoor heat exchanger Room temperature thermistor RT Muffler Compressor Flared connection Refrigerant pipe /4 (option) (with heat insulator) O.D. 0. o I.D o -5/8 Capillary tube Stop valve Strainer Flow of refrigerant OB74-

22 MS5TN MS7TN INDOOR UNIT MU5TN MU7TN OUTDOOR UNIT Refrigerant pipe 5/8 (option) (with heat insulator) Stop valve with service port Indoor heat exchanger Indoor coil thermistor RT Distributor Flared connection Service port Fusible plug Service port Outdoor heat exchanger Accumulator Room temperature thermistor RT Muffler Compressor Flared connection MU5 O.D. 0. o I.D o -5/8 MU7 O.D. 0. o I.D o 7-9/6 Capillary tube Refrigerant pipe /4 (option) (with heat insulator) Stop valve Strainer Flow of refrigerant OB74-

23 9 MICROPROCESSOR CONTROL MSTN MS5TN MS7TN MU09TW MUTN MU5TN MU7TN 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. WIRELESS REMOTE CONTROLLER Signal transmitting section Operation display section PM OPERATE /STOP (ON /OFF)button ON/OFF TOO WARM AM TOO COOL TEMPERATURE buttons CLOCK PM AM ON/OFF TOO WARM TOO COOL FAN SPEED CONTROL button OPERATION SELECT button RESET button I FEEL COOL FAN DRY MODE FAN STOP VANE START HR. MIN. RESET CLOCK OFF-TIMER button ON-TIMER button HR. button MIN. button (TIME SET button) CLOCK SET button VANE CONTROL button INDOOR UNIT DISPLAY SECTION Operation Indicator lamp The operation indicator located at the right side of the indoor unit indicates the operation state. The following indication applies regardless of shape of the indicatior. Operation Indicator lighted not lighted Indication Operation state Difference between target temperature and room temperature This shows that the air conditioner is operating to reach the target temperature. Please wait until the target temperature is obtained. This shows that the room temperature is approaching the target temperature. OB74- Approx. 4 F or more Approx. 4 F or less

24 9-. I FEEL CONTROL OPERATION () Press OPERATE/STOP(ON/OFF) button on the remote controller. OPERATION INDICATOR lamp of the indoor unit will turn on with a beep tone. () Press OPERATION SELECT button to set I FEEL CONTROL Then a beep tone is heard. () The operation mode is determined by the room temperature at start-up of the operation. Initial room temperature more than 77-F 55-F to 77-F mode COOL mode of I FEEL CONTROL DRY mode of I FEEL CONTROL Once the mode is fixed, the mode will not change by room temperature afterwards. Under the ON-TIMER operation, the mode is determined according to the room temperature at set time the operation starts. When the system is stopped with the OPERATE/STOP(ON/OFF) button 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. Operation time chart 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 or more, the operation mode is determined by the room temperature at startup of the operation. Operation time chart Example Previous operation COOL mode of I FEEL CONTROL or COOL mode Restart COOL or DRY 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. Mode Initial room temperature Initial set temperature COOL mode of I FEEL CONTROL DRY mode of I FEEL CONTROL 79-F or more 77-F to 79-F 55-F to 77-F 75-F Initial room temperature minus 4-F Initial room temperature minus 4-F w w When the system is restarted with the remote controller, the system operates with the previous set temperature regardless of the room temperature at restart. The set temperature is calculated by the previous set temperature. OB74-4

25 (5) TEMPERATURE buttons In I FEEL CONTROL mode, set temperature is decided by the microprocessor based on the room temperature. In addition, set temperature is 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 ~4 degrees( F) TOO WARM To lower the set temperature ~4 degrees( F) 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. Fan speed Initial temperature difference Room temperature minus set temperature : 4 degrees or more High Room temperature minus set temperature : Between and 4 degrees Med. Room temperature minus set temperature : less than degree Low Difference between room temperature and set temperature during operation 4 deg. 7 deg. deg. deg.. Coil frost prevention Temperature control <MS09> When the indoor coil thermistor RT reads 9-F or below for 5 minutes, the coil frost prevention mode starts. <MS/5/7> When the indoor coil thermistor RT reads 0-F or below, 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 the compressor stops for 5 minutes. After that, if RT still reads below 9-F (MS09) or below 0-F (MS/5/7) this mode is prolonged until the RT reads over 9-F (MS09) or 0-F (MS/5/7). 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 79-F. 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 79 F. However, when two of the above conditions (b.and c.) are satisfied again. Time accumulation is resumed. Compressor and Outdoor fan motor OFF ON OFF ON Indoor fan motor ON (continuously at set speed) OB74-5

26 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 temperature. By such controls, amount of air flow of indoor unit will be reduced in order to lower humidity without much room temperature drop.. Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button. 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 4-F as initial set temperature. Indoor fan and outdoor fan operate in the same cycle as the compressor. When the room temperature is 7-F 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 7-F. 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. 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 59 ~ 89-F 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. OB74-6

27 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 TEMPERATURE) 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 55-F or below FAN OPERATION () Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone. () Select FAN mode with the OPERATION SELECT button. () Select the desired fan speed. When AUTO,it becomes Low. Only indoor fan operates. Outdoor unit does not operate. F F 9-5. FAN MOTOR CONTROL<MS09> () Rotational frequency feedback control The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with the target rotational frequency (High, Med., Low) the microprocessor controls SR4 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 lamp flashes on and off to show the fan motor abnormality. (Refer to page 4.) 9-6. AUTO VANE OPERATION () 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. AUTO 4 5 Horizontal Middle Downward Swing OB74-7

28 () 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. (POWER ON/OFF) (b) When the vane control is changed 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. In FAN operation Vane angle is fixed to Angle 4. (5) STOP (operation OFF) and ON-TIMER standby When the following cases occur, the 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 in standby. (6) Dew prevention During COOL or DRY operation at vane Angle 4 or 5 when the compressor cumulative operation time exceeds hour, the vane angle automatically changes to Angle for dew prevention. (7) SWING MODE By selecting SWING mode with the VANE CONTROL button, the horizontal vane swings vertically. The remote controller displays. OB74-8

29 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 TIMER MONITOR, so set the current time correctly with CLOCK SET button. () Press ON/OFF TIMER buttons 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 (TIMER SET 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. (Example ) The current time is :00 AM. The unit turns off at :00 PM, and on at 6:00 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. OB74-9

30 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 0 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 0 minutes of test run operation the system shifts to EMERGENCY COOL MODE with a set temperature of 75 F. The fan speed shifts to Med. speed. The coil frost prevention works even in emergency operation. 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 again 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. The following indication applies regardless of shape of the indicator. OPERATION INDICATOR lamp Press once <Cool> EMERGENCY OPERATION switch Press once again <Stop> MSTN MS5TN MS7TN EMERGENCY OPERATION switch OB74-0

31 0 SERVICE FUNCTIONS MSTN MS5TN MS7TN 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. (Refer to page 9 or 40.) 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-. 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 indoor unit number. 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 press the OPERATE/STOP(ON/OFF)button twice or times at first. After finish remodelling, put back the batteries then press the RESET button. Table 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, press the RESET button. unit operation No 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 No. unit No. unit No. unit No. 4 unit How to set the remote controller exclusively for particular indoor unit After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote controller for the indoor unit. The indoor unit will only accepts the signal from the remote controller that has been assigned to the indoor unit once they are set. The setting will be cancelled if the breaker has turned off, or the power supply has shut down. Please conduct the above setting once again after the power has restored. OB74-

32 0-. AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed are memorized by controlled the indoor electronic control P.C. board(ms09) the auto restart assembly(ms/57). When the main power is turned off and then turned back on, the unit restarts automatically in the memorized set conditions approximately after minutes. How to release AUTO RESTART FUNCTION Turn off the main power for the unit. Pull out the indoor electronic control P.C. board and the display P.C.board. (Refer to page 4 or 45.) <MS09> Solder the Jumper wire or the Resistor 0 ž to the JR07 on the indoor electronic control P.C.board. (Refer to page 9.) <MS/5/7> Disconnect the AUTO RESTART ASSY from CN04, and solder the Jumper wire to JHA on the indoor electronic control P.C. board. (Refer to page 40.) Operation If the main power (5V 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.) MS09 MS/5/7 C C CN0 CN CN0 JHA CN IC0 IC5 CN CN SW CN5 IC0 RA0 BZ CN0 CN0 SW CN CNCN5 CN04 JR07 NOTE: The operation settings are memorized when 0 seconds have passed after the indoor unit was operated with the remote controller. If the 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 power 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. OB74-

33 TROUBLESHOOTING MSTN MS5TN MS7TN MU09TW MUTN MU5TN MU7TN -. 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, first be sure to turn off the remote controller to stop the unit, and then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug. ) 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 discoloration. 4) When troubleshooting, refer to the flow chart and the check table on page How to replace batteries Weak batteries may cause the remote controller malfunction. In this case, the remote controller can be repaired only by the battery replacement. To operate the remote controller normally, replace the batteries in the following order. This remote controller has the RESET button. After refilling new batteries, press the RESET button with tip end of ball point pen or the like, and then use the remote controller. Remove the front lid and replace batteries. Press the RESET button. Then re-attach the front lid. 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. OB74-

34 -. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn t operate. Outdoor unit operates in only Test Run mode. Check room temperature thermistor. Outdoor unit doesn t operate even in Test Run mode. Refer to D Check of outdoor unit on page 8. Indoor unit doesn t receive the signal from remote controller. Refer to B Check of remote controller and receiver P.C. board on page 7. <MS/5/7> When the remote controller is pressed or when the EMERGENCY OPERATION switch is pressed,the indoor fan does not rotate with OPERATION INDICATOR lamp on. OPERATION INDICATOR lamp on the indoor unit is flashing on and off. -time flash.5-second OFF <MS09> -time flash.5-second OFF Indoor unit doesn t receive the signal from remote controller. Also, operation indicator lamp doesn t flash, when the emergency operation switch is pressed. Refer to C Check of indoor electronic control P.C. board on page 8. Cause:Indoor unit -time-room temperature/indoor coil thermistor trouble. -time-indoor fan motor trouble Refer to A Check of indoor fan motor on page 6.. Troubleshooting check table The following indication applies regardless of shape of the indicatior. flashing Check indoor coil thermistor. Refer to Test point diagram and voltage on page 9 or 40. Flashing of the OPERATION INDICATOR lamp (on the left-hand side) Operation Indicator indicates possible abnormalities. The OPERATION INDICATOR lamp (on the left-hand side) is lighted during normal operation. Before taking measures make sure that the symptom reappears, for accurate troubleshooting. Self check table Abnormal NO. Indication Symptom Detect method point Check room temperature. Refer to Test point diagram and voltage on page 9 or 40. Check point Indoor coil thermistor Room temperature thermistor -time flash.5-second OFF Outdoor unit does not run. Detects Indoor coil/room temperature thermistor short or open circuit every 8 seconds during operation. Check resistance of thermistor. Re-connect connector. Check indoor electric P.C. board. Indoor fan motor <MS09> -time flash.5-second OFF Indoor fan repeats seconds ON and minutes OFF. When the indoor fan breaks, the fan 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. OB74-4

35 MSTN MS5TN MS7TN MU09TW MUTN MU5TN MU7TN. Trouble criterion of main parts Part name Check method and criterion Room temperature thermistor(rt) Indoor coil thermistor(rt) Compressor (MC) Measure the resistance with a tester. (Part temperature 50 F ~ 86 F) Normal 8k" ~ 0k" Abnormal Open or short-circuit Measure the resistance between the terminals with a tester. (Part temperature 4 F ~ 04 F) C-R C-S MU09 0.7~.0".0~.4" Normal MU MU5 MU7.9~.4".4~.9".4~.8".7~.4".4~.0".~.9" Abnormal Open or short-circuit Figure WHT P RED BLK Measure the resistance between the terminals with a tester. (Part temperature 50 F ~ 86 F) Indoor fan motor(mf) Motor part Sensor part WHT-BLK BLK-RED Measure the voltage Power ON. BRN-YLW YLW-GRY Normal MS09 76~8 " 70~76 " Normal MS ~ 5.5V (When fan revolved one time) 0V 5V 0V (Approx.) Abnormal Remain 0V or 5V Abnormal Open or short-circuit MS09 MAIN WHT RED AUX. BLK FUSE YLW GRY BRN Motor part WHT-BLK BLK-YLW YLW-BLU BLU-BRN BRN-RED Normal MS/5 MS7 65~7" 5~57" 8~0" 0~" 4~6" 4~5" 5~7" 5~6" 8~" 5~9" Abnormal Open or short-circuit MS/5/7 AUX. YLW AUX. BLU AUX. AUX.4 BRN RED ORN BLK MAIN FUSE WHT Outdoor fan motor(mf) Measure the resistance between the terminals with a tester. (Part temperature4 F ~ 04 F) WHT-BLK BLK-RED MU09 54~67" 58~7" Normal MU 6~4" 5~64" MU5/7 0~6" 97~0" Abnormal Open or short-circuit MU09/ AUX. RED MU5/7 AUX. RED P P BLK WHT BLK MAIN MAIN ORN WHT Vane motor(mv) Measure the resistance between the terminals with a tester. (Part temperature 50 F ~ 86 F) MS09 8 ~ 06" Normal MS/5/7 BRN- other one RED- other one 58 ~ 88" Abnormal Open or short-circuit MS09 RED YLW BRN MS/5/7 PNK ROTOR ORN GRN ROTOR ORN RED YLW BLU OB74-5 P:INNER PROTECTOR

36 A Check of indoor fan motor Indoor fan does not operate. Turn OFF the power supply. Check connector (Fan motor) visually. No Are lead wires connected? Yes Is soldered point of the connector correctly soldered? No Re-connect the lead wires. Disconnect lead wires from connector (Fan motor). Measure resistance between lead wires No. and No. and then No. and No. (MS09) No. and No.4 and then No. and No.4 (MS/5/7) Yes { } Re-solder it. Is resistance 0 (short circuit) or (open circuit)? No (others) MS/5/7 Replace the indoor electronic control P.C. board. Yes ( 0 or ) MS09 Insert screwdriver into air outlet and rotate indoor fan (motor) slowly for revolution or more, and measure voltage between CN -. Repair or replace the indoor fan motor. No Does voltage repeat 0V DC and more than 5V DC? Yes OB74-6

37 B Check of remote controller and receiver P.C. board Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote controller. Switch on the remote controller Is LCD display on remote controller displayed? Yes Remove batteries, then set them back and press the RESET button. Check if the unit operates with the remote controller. No (not clear) Replace the batteries.(refer to page.) wcheck the remote controller is exclusive for this air conditioner. win case of replacing the receiver P.C. board of, replace the indoor electronic control P.C. board with it because they are unified. Does the unit operate with remote controller? No Turn a radio to AM and press switch on remote controller. OK Yes Is noise heard from radio? No Replace the remote controller. Yes Are there any fluorescent lights of inverter or rapid-start type within the range of.8ft.? Yes Re-install the unit away from lights. Attach a filter on receiving part. No MS/5/7 MS09 Connect properly. No Is the connector connecting receiver P.C. board and indoor electronic control P.C. board properly connected? Yes Replace the receiver P.C. board. Replace the power monitor, receiver P.C. board with the indoor electronic control P.C. board. No Does the unit receive signal of ON/OFF with the remote controller and emit a beep tone? OK Yes Connect properly. No Is auto restart assembly properly connected? Yes Replace the auto restart assembly. No Does the unit receive signal of ON/OFF with remote controller and emit a beep tone? Yes OK Replace the indoor electronic control P.C. board. No Does the unit receive signal of ON/OFF with remote controller and emit a beep tone? Yes OK OB74-7