Download Mitsubishi Mr.Slim MS24WN Service manual
Transcript
OB311--1.qxp 04.1.13 9:53 AM Page 1 Revision: ● PARTS LIST have been partially modified. ● Please void OB311. SPLIT-TYPE, AIR CONDITIONERS No. OB311 REVISED EDITION-A SERVICE MANUAL Wireless type Models MS24WN (W) · MU24WN CONTENTS 1. FEATURES ·························································3 2. PART NAMES AND FUNCTIONS······················4 3. SPECIFICATION·················································6 4. DATA···································································8 5. OUTLINES AND DIMENSIONS ·······················12 6. WIRING DIAGRAM ··········································14 7. REFRIGERANT SYSTEM DIAGRAM ··············15 8. MICROPROCESSOR CONTROL ····················16 9. SERVICE FUNCTIONS ····································25 10. TROUBLESHOOTING······································27 11. DISASSEMBLY INSTRUCTIONS·····················40 12. PARTS LIST······················································44 13. OPTIONAL PARTS ······················BACK COVER INDOOR UNIT Indication of model name MS24WN Remote controller OUTDOOR UNIT Indication of model name MU24WN The Slim Line. From Mitsubishi Electric. TM C L IST ED US OB311--1.qxp 04.1.13 9:53 AM Page 2 Revision: • Parts No. has been changed due to the color change of outdoor unit parts. WHITE➔NEW WHITE (Brighter) • Capillary tube has been added to parts list. Model Page MU24WN 47 Part name CAPILLARY TUBE (TAPER PIPE) [0.14X[0.09X1-31/32 Part number E02 784 936 OB311--1.qxp 04.1.13 9:53 AM 1 Page 3 FEATURES MS24WN MU24WN LCD wireless remote controller Model Cooling capacity SEER MS24WN 22,800 Btu/h 10.5 “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 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. 3 OB311--1.qxp 2 04.1.13 9:53 AM Page 4 PART NAMES AND FUNCTIONS INDOOR UNIT MS24WN Grille Air inlet Deodorizing filter (option) (Gray sponge type) Air cleaning filter (option) (White bellows type) Front panel Remote control receiving section Horizontal vane Air filter Remote controller Vertical vane Display section Operation section (When the grille is opened) Operation indicator lamp Operation Indicator Emergency operation switch Receiving section ACCESSORIES MS24WN 1 2 3 4 5 6 7 Installation plate Installation plate fixing screw 4 x 25 mm(0.16 x 0.98 in.) Remote controller holder Fixing screw for 3 3.5 x 16 mm(0.14 x 0.63 in.) (Black) Battery (AAA) for remote controller Wireless remote controller Felt tape (Used for left or left-rear piping) OUTDOOR UNIT MU24WN 4 1 7 1 2 2 1 1 OB311--1.qxp 04.1.13 9:53 AM Page 5 REMOTE CONTROLLER MS24WN Signal transmitting section Operation display section PM OPERATE/ STOP (ON/ OFF)button AM TOO ON/OFF WARM TOO COOL TEMPERATURE buttons Open the front lid. CLOCK PM AM TOO ON/OFF WARM VANE button (Horizontal vane button) TOO COOL FAN STOP VANE START OFF-TIMER button I FEEL COOL FAN FAN SPEED CONTROL button DRY ON-TIMER button MODE WIDE VANE HR. OPERATION SELECT button LONG MIN. HR. button MIN. button (TIME SET button) RESET CLOCK CLOCK SET button WIDE VANE button (Vertical vane button) LONG button RESET button 5 OB311--1.qxp 04.1.13 9:53 AM 3 Page 6 SPECIFICATION Model Item ❈1 Cooling capacity Btu/h Power consumption ❈1 W EER ❈1 [SEER] ❈2 INDOOR UNIT MODEL External finish Power supply Max. fuse size (time delay)/ Disconnect switch A Min. ampacity A Fan motor F.L.A FAN Dry CFM Airflow Low—Med.—High COOL Dry(Wet) CFM pt./h Moisture removal Sound level Low-Med.-High dB(A) in. Cond. drain connection O.D. W in. Dimensions D in. H in. Weight lb. OUTDOOR UNIT MODEL External finish Power supply Max. fuse size (time delay) A Min. ampacity A Fan motor F.L.A Model Winding resistance (at 68˚F) Ω Compressor R.L.A L.R.A Refrigerant control Sound level dB(A) W in. Dimensions D in. H in. Weight lb. REMOTE CONTROLLER Control voltage (by built-in transformer) REFRIGERANT PIPING Pipe size Liquid in. (Min. wall thickness) Gas in. Indoor Connection method Outdoor Between the indoor Height difference ft. & outdoor units Piping length ft. Refrigerant charge (R22) oz. Refrigerant oil (Model) MS24WN 22,800 2,170 10.5 (10.5) MS24WN White 115V 60Hz 1[ 15 1.1 0.82 431-491-565 402(346)-484(417)-565(487) 7.6 39-43-47 5/8 43-5/16 8-15/16 12-13/16 40 MU24WN Munsell 5Y7/1 208/230V 60Hz 1[ 3 wires 25 22 0.87 PH33NPBT C-R 0.84 C-S 2.09 16 58 Linear expansion valve 55 34-1/4 11-5/8 33-1/2 152 Wireless type 12V DC Not supplied (optional parts) 3/8 (0.0285) 5/8 (0.0315) Flared Flared Max. 25 Max. 50 4 Ib. 5 oz. 27.9 (MS32N1) Notes : Test conditions are based on ARI 210/240 ❈1 : Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, (75˚FWB) ❈2 : Rating conditions (cooling) — Indoor : 80˚FDB, 67˚FWB, Outdoor : 82˚FDB, 65˚FWB Operating Range Cooling Maximum Minimum Indoor intake air temperature Outdoor intake air temperature 95˚FDB, 71˚FWB 115˚FDB 67˚FDB, 57˚FWB 67˚FDB 6 OB311--1.qxp 04.1.13 9:53 AM Page 7 MAX. REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE Piping size : in. Additional piping Max. length : ft. A Model MS24WN MU24WN 50 Gas Length of connecting pipe : in. Liquid Minimum Outside Minimum Outside Wall Wall diameter thickness diameter thickness [ 5/8 0.0315 [ 3/8 0.0285 Indoor unit Outdoor unit Gas : 16-15/16 Liquid : 19-11/16 Gas : 0 Liquid : 0 MAX. HEIGHT DIFFERENCE Indoor unit w Height difference should be within 25ft. regardless of w Max. Height which unit, indoor difference 25ft. or outdoor position is high. Additional Piping Max. length A Outdoor unit 7 OB311--1.qxp 04.1.13 9:53 AM Page 8 DATA 4 4-1. PERFORMANCE DATA 1) COOLING CAPACITY MS24WN MU24WN (208V/ 230V) Indoor air Model IWB (˚F) MS24WN Outdoor intake air DB temperature(˚F) 85 75 95 105 115 TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC TC SHC TPC 71 27.9 13.9 1.93 26.1 13.0 2.12 24.5 12.2 2.28 22.8 11.3 2.40 21.0 10.4 2.50 67 26.4 16.7 1.82 24.6 15.5 2.01 22.8 14.4 2.17 21.2 13.4 2.30 19.5 12.3 2.41 63 24.9 19.0 1.74 23.0 17.6 1.92 21.4 16.4 2.07 19.5 14.9 2.21 17.8 13.6 2.30 Notes 1. I WB : Intake air wet-bulb temperature. TC : Total Capacity (x103 Btu/h), SHC : Sensible Heat Capacity (x103 Btu/h) TPC : Total Power Consumption (kW) 2. SHC is based on 80˚F of indoor intake air DB temperature. 2) COOLING CAPACITY CORRECTIONS Refrigerant piping length (one way) Model MS24WN 25ft. (std.) 40ft. 50ft. 1.0 0.954 0.923 4-2. PERFORMANCE CURVE MS24WN MU24WN Cooling SHF at rating condition = 0.63 Airflow = 487CFM Bypass Factor = 0.16 30 Total power consumption (kW) Total capacity ( ✕10 Btu/h) 28 26 24 22 208V/230V Ind oor inta ke air WB tem per 20 atu 18 re ( °F) 71 67 63 16 2.6 208V/230V 2.4 2.2 re 2.0 1.6 ke or ndo inta ) (°F p em Bt 1.8 tu era 71 67 63 W air I 1.4 65 70 75 80 85 90 95 100 105 110 115 Outdoor intake air DB temperature (°F) 8 OB311--1.qxp 04.1.13 9:53 AM Page 9 4-3. Condensing pressure Data is based on the condition of indoor humidity 50%. Air flow should be set at High. MU24WN (PSIG) 300 86 80 75 70 (PSIG) 100 260 re 90 atu r pe 240 B rD tem Suction pressure Condensing pressure 280 oo Ind 220 200 180 160 68 70 mperature Indoor DB te 80 86 80 70 75 70 60 50 75 80 85 90 95 100 40 68 70 104(°F) Outdoor ambient temperature 9 75 80 85 90 95 Outdoor ambient temperature 100 104(°F) OB311--1.qxp 04.1.13 9:53 AM Page 10 4-4. STANDARD OPERATION DATA Model MS24WN Unit Cooling Btu / h 22,800 SHF — 0.63 Input kW 2.17 Item Capacity Total INDOOR UNIT MODEL MS24WN Power supply 115V 60Hz 1[ Input kW 0.071 A 0.62 Fan motor current Electrical circuit OUTDOOR UNIT MODEL MU24WN Power supply 208/230V 60Hz 1[ Input kW 2.099 A 9.36/ 8.30 Comp. current Fan motor current A 0.67/0.71 Condensing pressure PSIG 250 Suction pressure PSIG 71 ˚F 174 Refrigerant Condensing temperature circuit Suction temperature ˚F 115 ˚F 48 Comp. shell bottom temp ˚F 158 Ref. pipe length ft. 25 Refrigerant charge (R22) — 4 Ib. 5 oz. DB ˚F 80 WB ˚F 67 DB ˚F 51 WB ˚F 50 Fan speed (High) rpm 1,280 Airflow (High) CFM 487(Wet) DB ˚F 95 WB ˚F — Fan speed rpm 750/820 Airflow CFM 1,589/1,765 Discharge temperature Intake air temperature Indoor unit Discharge air temperature Intake air temperature Outdoor unit POWER SUPPLY MS24WN ✻ Control voltage •Both wirings can be applied. INDOOR UNIT 115V 60Hz 1[, 2wires INDOOR UNIT Disconnect switch OUTDOOR UNIT SIGNAL WIRE 2 wires 12V DC OUTDOOR UNIT SIGNAL WIRE 2 wires 12V DC 115V 60Hz 1[, 2 wires 115V 208/230V 60Hz 1[, 3 wires 208/230V 60Hz 1[, 3 wires 10 Power supply voltage to serial signal circuit is 12V DC. Voltage between 1 + and 3 -on in-out terminal block will be 12V DC peak. OB311--1.qxp 04.1.13 9:53 AM Page 11 4-5. OPERATING RANGE (1) POWER SUPPLY Model Rating Guaranteed Voltage Indoor unit MS24WN 115V 60Hz 1[ Outdoor unit MU24WN 208/230V 60Hz 1[ Min. 103V 115V Max. 127V Min. 198V 208V 230V Max. 253V (2) OPERATION Intake air temperature Function Outdoor Indoor DB (˚F) WB (˚F) DB (˚F) WB (˚F) Standard temperature 80 67 95 — Maximum temperature 95 71 115 — Minimum temperature 67 57 67 — Condition Cooling — 78% Maximum humidity 4-6. OUTLET AIR SPEED AND COVERAGE RANGE Model Mode Function MS24WN FAN COOL Dry Wet Air flow (CFM) 565 487 Air speed Coverage (ft./sec.) range (ft.) 20.1 34.2 17.2 29.4 ● The air coverage range is the figure up to the position where the air speed is 1 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. 4-7. ADDITIONAL REFRIGERANT CHARGE (R22(oz.)) Model MS24WN MU24WN Outdoor unit precharged (up to 25ft.) 25ft. 30ft. 35ft. 40ft. 45ft. 50ft. 4 lb. 5 oz. 0 0.81 1.62 2.43 3.24 4.05 Refrigerant piping length (one way) CALCULATION : Xoz. = 0.81/ 5oz./ft. x (Additional Piping Length-25) ft. 11 OB311--1.qxp 04.1.13 9:53 AM 5 Page 12 OUTLINES AND DIMENSIONS MS24WN Unit: inch INDOOR UNIT 3-7/8 6-13/16 16-5/16 1-7/8 16-5/16 3-7/8 1/8 1-7/8 10-1/16 42-1/16 6-13/16 Wall hole [ 2-15/16 8-7/8 3/16 43-5/16 12-13/16 Installation plate { Air in 2-3/16 31-1/8 9-15/16 Air out 3/4 6-3/8 2-5/16 Wireless remote controller 12 8-15/16 Liquid line [ Gas line [ Insulation [ [ 3/8 19-11/16 3/4 16-15/16 1-15/16 O.D 1-1/4 I.D Drain hose [ 5/8 (Connected part O.D) Insulation [ 1-1/8 5/16 Indoor unit 12-3/8 Installation plate Page 13 MU24WN OUTDOOR UNIT Unit: inch Outdoor Unit-Necessary surrounding clearance 7-7/8 1-9/16 1-1/16 13 14-1/4 Air intake Air intake Front opening 9/16 Air outlet Note:Allow adequate 13/32 upper clearance 13/32 Terminal block for power line 34-1/4 13/32 Terminal block for indoor and outdoor unit connection 11-7/8 19-11/16 5-29/32 7-9/32 19-11/16 11/16 7-9/32 19-11/16 04.1.13 9:53 AM Service space Outlet guide installation hole Handle for moving Service panel Handle for moving 4-1/8 1-5/16 2-1/16 Refrigerant-pipe flared connection [3/8 Knock out hole for front piping (refrigerant,drainage and wiring) 2-3/8 2-1/2o7/8 Oval holes (standard bolt M10) Refrigerant-pipe flared connection [5/8 1-3/4 33-1/2 21-3/4 17-17/32 20-5/8 1-5/8 1-3/4 1-9/16 17-23/32 18-7/18 20-5/8 7-1/18 17-3/8 A 2-3/8 4-3/4 Knock out holes for power line 2-[1-1/16 Knock out hole for right piping (refrigerant,drainage and wiring) Drain hole [1-5/16 Bottom piping hole 2-U-shaped notched holes Drain hole [1-5/16 9/32 A Handle for moving 11-5/8 15/16 Side air intake Conduit hole Rear fresh air intake R1 Outdoor Unit-Necessary surrounding clearance (Concentrated installation) The upper side must be open. 3/ 3-1/8 16 /4 11/16 13/32 7-7/8 4 R1 1/2 For 10 units or less 39-3/8 13 1 max. Rear piping hole 3-3/4 3/1 6 15/16 1-5/16 5-7/16 NOTE: Do not wire12V DC and 115V AC in same conduit hole. R1 OB311--1.qxp Standard bolt length 2-9/16 Front right piping holesdetail figures OB311--1.qxp 04.1.13 9:53 AM 6 Page 14 WIRING DIAGRAM MS24WN INDOOR UNIT ( MODEL WIRING DIAGRAM 4 3 2 1 CN201 TO OUTDOOR UNIT CONNECTING WIRES 12V DC FROM OUTDOOR UNIT CONNECTING WIRES POWER SUPPLY 115V 1 phase 60Hz TO OUTDOOR UNIT CONNECTING WIRE TB 3+ ORN w 1- VLT N BLK L1 ) HIC1 1 2 3 4 CN 151 CN 102 15 MV2 MV2 MV1 CN 101 SR141 CN211 CN 3 3 DISPLAY P.C.BOARD RECEIVER P.C.BOARD NAME REMOTE CONTROLLER SYMBOL NAME SYMBOL MV1 VANE MOTOR(HORIZONTAL) RT12 INDOOR COIL THERMISTOR(MAIN) FUSE(3.15A) MV2 VANE MOTOR(VERTICAL) RT13 INDOOR COIL THERMISTOR(SUB) DC/DC CONVERTER NR11 VARISTOR INDOOR FAN MOTOR (INNER PROTECTOR) RT11 ROOM TEMPERATURE THERMISTOR C11 INDOOR FAN CAPACITOR F11 HIC1 MF MF RT11 ELECTRONIC CONTROL P.C. BOARD 111 w A disconnect may be required by local code. SYMBOL 1 3 4 C11 TAB12 BLK GRY YLW BRN WHT RED 3 CN 121 TRANS RED RT12 CN112 NR11 F11 RT13 NAME SOLID STATE RELAY SR141 TERMINAL BLOCK TB NOTE:1. About the outdoor side electric wiring, refer to the outdoor unit electric wiring diagram for servicing. 2. Use copper conductors only.(For field wiring) 3. Symbols below indicate; : Terminal block, : Connector LEV CN662 1 - X52 2 CN724 1 1 RED ORN C2 3 CN711 2 SR61 TAB52 X52 BLK L1 NO F61 1 3 NR61 T61 CN730 5 OUTDOOR ELECTRONIC CONTROL P.C. BOARD N RED WHT 1 BLU GRN/YLW GROUND 7 ORN VLT BLU RED BLU NAME 3 COM L2 SYMBOL 4 N TB1 L1 POWER SUPPLY 208/230V 1 phase 60Hz 5 BLK WHT + RED TO INDOOR UNIT CONNECTING WIRES 115V 1 phase 60Hz 6 6 TB2 3 BLU FROM INDOOR UNIT CONNECTING WIRE FROM INDOOR UNIT CONNECTING WIRES 12V DC MF RT62 RT63 BLK WHT ORN RED MU24WN MODEL WIRING DIAGRAM OUTDOOR UNIT SG79J618H02 RED A2 DSAR SYMBOL 52C NAME 52C C1 A1 SYMBOL C 2 RED S MC R BLK NAME C1 COMPRESSOR CAPACITOR MF OUTDOOR FAN MOTOR(INNER PROTECTOR) TB2 TERMINAL BLOCK C2 OUTDOOR FAN CAPACITOR NR61 VARISTOR T61 TRANSFORMER SURGE ABSORBER RT62 DISCHARGE TEMPERATURE THERMISTOR X52 COMPRESSOR AUXILIARY RELAY F61 FUSE(3.15A) RT63 AMBIENT TEMPERATURE THERMISTOR 52C COMPRESSOR CONTACTOR LEV EXPANSION VALVE COIL SR61 MC COMPRESSOR(INNER PROTECTOR) DSAR TB1 SOLID STATE RELAY TERMINAL BLOCK NOTE:1. About the indoor side electric wiring, refer to the indoor unit electric wiring diagram for servicing. 2. Use copper conductors only.(For field wiring) 3. Symbols below indicate; : Terminal block, : Connector 14 SG79J606H02 OB311--1.qxp 04.1.13 9:53 AM 7 Page 15 REFRIGERANT SYSTEM DIAGRAM Unit: inch MS24WN INDOOR UNIT MU24WN OUTDOOR UNIT Refrigerant pipe [5/8 (with heat insulator) Indoor heat exchanger Indoor coil thermistor RT12(main) Strainer #100 Stop valve (with service port) Flared connection Indoor coil thermistor RT13(sub) SERVICE PORT Discharge temperature thermistor RT62 SERVICE PORT Outdoor heat exchanger FUSIBLE PLUG Room temperature thermistor RT11 Accumulator Compressor Capillary tube O.D.0.16✕I.D.0.09✕7-7/8 (Upper path) Strainer #50 Flared connection LEV Stop valve Ambient temperature thermistor RT63 Capillary tube O.D.0.16✕I.D.0.09✕3-15/16 (Lower path) Strainer #100 Capillary tube O.D.0.14✕I.D.0.09✕1-31/32 Refrigerant pipe [3/8 (with heat insulator) Refrigerant flow in cooling 15 OB311--1.qxp 8 04.1.13 9:53 AM Page 16 MICROPROCESSOR CONTROL MS24WN MU24WN WIRELESS REMOTE CONTROLLER Once the operation mode is 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, 3-minute time delay will operate to protect system from overload and compressor will not restart for 3 minutes. Signal transmitting section Operation display section PM AM OPERATE/ STOP (ON/ OFF)button TOO ON/OFF WARM TOO COOL TEMPERATURE buttons 8-1. “I FEEL CONTROL” ( Initial room temperature CLOCK 77-F or more PM AM TOO ON/OFF WARM more than 55-F, less than 77-F TOO COOL FAN SPEED CONTROL button VANE button (Horizontal vane button) FAN STOP VANE START FAN DRY ON-TIMER button MODE WIDE VANE HR. OPERATION SELECT button LONG MIN. HR. button MIN. button (TIME SET button) RESET CLOCK CLOCK SET button WIDE VANE button (Vertical vane button) LONG button RESET button INDOOR UNIT DISPLAY SECTION Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state. • The following indication applies regardless of shape of the indicator. Operation Indicator mode COOL mode of “I FEEL CONTROL“ DRY mode of “I FEEL CONTROL” ● Once the mode is fixed, the mode does not change by room temperature afterwards. OFF-TIMER button I FEEL COOL ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button on the remote controller. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select “I FEEL CONTROL”( ) mode with the OPERATION SELECT button. (3) The operation mode is determined by the room temperature at start-up of the operation. ● Under the ON-TIMER ( ) operation, the 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 2 hours in “I FEEL CONTROL” ( ) mode, the system operates in previous mode automatically regardless of the room temperature. Operation timer chart Example Previous operation COOL mode of “I FEEL CONTROL” or COOL mode lighted Restart COOL mode of “I FEEL CONTROL” not lighted Indication Operation state Difference between set 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. Approx. 4-F or more This shows that the room temperature is approaching the target temperature. Approx. 4-F or less When the system is restarted after 2 hours and more, the operation mode is determined by the room temperature at start-up of the operation. Operation timer chart Example Previous operation COOL mode of “I FEEL CONTROL” or COOL mode 16 Restart COOL or DRY mode of “I FEEL CONTROL” that determined by room temperature at start-up of the operation. OB311--1.qxp 04.1.13 9:53 AM Page 17 (4) The initial set temperature is decided by the initial room temperature. Mode COOL mode of "I FEEL CONTROL" DRY mode of "I FEEL CONTROL" Initial room temperature Initial set temperature 79-F or more 75-F 77-F to 79-F Initial room temperature minus 4-F ❈1 more than 55-F, less than 77-F Initial room temperature minus 4-F w 1 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. (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 2~4 degrees(°F) TOO WARM … To lower the set temperature 2~4 degrees(°F) 8-1-1. COOL mode of “I FEEL CONTROL” 1. Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button. Difference between room In AUTO the fan speed is as follows. temperature and set temFan speed perature during operation Initial temperature difference Room temperature minus set temperature : 3 degrees or more········································High Room temperature minus set temperature : Between 2 and 3 degrees····························Med. 4 deg. Room temperature minus set temperature : less than 2 degree······································· Low 2 deg. 3 deg. 2. Coil frost prevention 1 Temperature control When the indoor coil thermistor RT12 or RT13 reads 30°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 and the compressor stops for 5 minutes. After that, if RT12 or RT13 still reads below 30°F this mode prolonged until the RT12 and RT13 reads over 30°F. 2 Time control When the three conditions as follows have been satisfied for 1 hour and 45 minutes, compressor stops for 3 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. 17 OB311--1.qxp 04.1.13 9:53 AM Operation chart Example Compressor Outdoor fan Indoor fan Page 18 ON ON OFF OFF ON (continuously at set speed) 3. Discharge temperature protection The compressor is controlled by the temperature of discharge temperature thermistor RT62 for excess rise protection of compressor discharge pressure. • Compressor When the temperature of discharge temperature thermistor RT62 goes to 248°F or more, the compressor is turned OFF. After 3 minutes since the compressor has been turned OFF, if the temperature of discharge temperature thermistor RT62 becomes 212°F or less, the compressor is turned ON. 8-1-2. 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. 1. 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. 2. 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 from initial room temperature. Indoor fan and outdoor fan operate in the same cycle as the compressor. • When the room temperature is 73°F or over: When the thermostat is ON, the compressor repeats 8 minutes ON and 3 minutes OFF. When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON. • When the room temperature is under 73°F. When the thermostat is ON, the compressor repeats 2 minutes ON and 3 minutes OFF. When the thermostat is OFF, the compressor repeats 4 minutes OFF and 1 minute ON. Operation time chart Example ON Thermostat ON OFF OFF Indoor fan OFF OFF ON Outdoor fan Compressor OFF OFF ON OFF 8 min. ON ON ON ON OFF 3 min. 4 min. 1 min. 3. 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 5minutes, 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. 18 OB311--1.qxp 04.1.13 9:53 AM 8-2. COOL ( Page 19 ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select COOL mode with the OPERATION SELECT button. (3) Press TEMPERATURE buttons. (TOO WARM or TOO COOL button) to select the desired temperature. The setting range is 59 ~ 89°F. w Indoor fan continues to operate regardless of thermostat’s OFF-ON at set speed. w Coil frost prevention is as same as COOL mode of “I FEEL CONTROL”. ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select DRY mode with the OPERATION SELECT button. (3) 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 55°F or below. 8-4. FAN( d )OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns ON with a beep tone. (2) Select FAN mode with the OPERATION SELECT button. Only indoor fan operates. Outdoor unit does not operate. Set temperature and initial temperature in DRY mode -F 95 86 Set temperature 8-3. DRY ( 77 68 59 50 50 59 68 77 Initial room temperature 86 95 -F 8-5. FAN MOTOR CONTROL (1) 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, SR141 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. High High Med. Low (2) Fan motor lock-up protection When the rotational frequency feedback signal has not output for 12 seconds, (or when the microprocessor cannot detect the signal for 12 seconds) the fan motor is regarded locked-up. Then the electric current to the fan motor is shut off. 3 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 29.) 19 OB311--1.qxp 04.1.13 9:53 AM Page 20 8-6. AUTO VANE OPERATION 1. Horizontal vane (1) Vane motor drive This model is equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of the motor are controlled by pulse signals (approx. 12V) transmitted from microprocessor. (2) The horizontal vane angle and mode change as follows by pressing the VANE button. AUTO Horizontal Middle Downward Swing (3) 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 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 horizontal vane angle and operation to make the optimum room-temperature distribution. 1 In COOL and DRY operation Vane angle is fixed to Angle 1. 2 In FAN operation Vane angle is fixed to Angle 4. (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 compressor cumulative operation time exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention. (7) SWING MODE ( ) By selecting SWING mode with the VANE button, the horizontal vane swings vertically. The remote controller displays “ ”. (8) LONG MODE ( ) By pressing the LONG button indoor 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 “ when the LONG button is pressed once again or the VANE button is pressed. 20 ”. LONG mode is cancelled OB311--1.qxp 04.1.13 9:53 AM Page 21 • In the following example, the vertical vane is set to (front.). COOL / DRY FAN Fan speed : Faster Solid arrow : When the LONG mode is used. Dotted arrow : When the LONG mode is not used. 2. Vertical vane (1) 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. 12V) transmitted from indoor microprocessor. (2) The vertical vane angle and mode changes as follows by pressing the WIDE VANE button. 1 2 4 3 SWING 5 6 Air flow direction Air flow blowing range (3) 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 under following conditions. (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 “ ”. Horizontal AIR FLOW blowing range About 100- W Indoor fan speed becomes faster than setting fan speed on the remote controller even when or is selected. 8-7. TIMER OPERATION 1. How to set the timer (1) Press OPERATE/STOP(ON/OFF) button to start the air conditioner. (2) 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. (3) 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) 21 OB311--1.qxp 04.1.13 9:53 AM Page 22 (4) Press HR. and MIN. button (TIME set button) to set the timer. Time setting is 10-minute units. HR. and MIN. button will work when “ ” or “ ” mark is flashing. These marks disappear in 1 minute. After setting the ON timer, check that OPERATION INDICATOR lamp of the indoor unit lights. NOTE1 :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 10 minutes. NOTE2 :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. 2. 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 2) The current time is 11:00 AM. (Example 1) The current time is 8:00 PM. The unit turns on at 5:00 PM, and off at 9:00 PM. The unit turns off at 11:00 PM, and on at 6:00 AM. PM PM AM PM NOTE : TIMER setting will be cancelled by power failure or breaker functioning. 8-8. 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 30 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 30 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 EMERGENCY OPERATION switch 22 Press once <Cool> Press once again <Stop> OB311--1.qxp 04.1.13 9:53 AM Page 23 8-9. LEV control General operation Basic specification LEV (Expansion valve) is controlled by “Thermostat ON” commands given from the unit. Controlled range Minimum : 54 pulse, Maximum : 500 pulse Drive speed 30 ~ 90 pulse / second Opening set The setting is always in opening direction. (To close the LEV, it is closed to the pulse smaller than the one which is set finally. Then the LEV is opened to the final setting pulse.) Stop of indoor unit Opening in stop : 150 pulse ➔ LEV opening is set to becomes 500 pulse after 3 minutes passed. Remote controller ON LEV positioning (LEV is closed completely at once) Power ON (Breaker ON) LEV is positioned. However, afterwards, LEV is not positioned at the first remote controller ON. Approximate for 2 minutes since compressor has started. Opening is set by the initial opening. (Initial opening is set according to each operation modes and outer temperature conditions.) From approximate 2 minutes to approximate 13 minutes (for 11 minutes) since compressor has started. Opening is set by standard opening. (Standard opening is set according to each operation modes and outer temperature conditions.) After 13 minutes passed since compressor has started. LEV opening is corrected to be once every 2 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.) At thermostat OFF Opening in stop : 150 pulse ➔ LEV is set to the initial opening after about 3 minutes passed. At thermostat ON Same as the starting of compressor operation At remote controller OFF Opening in stop : 150 pulse ➔ LEV is set so that the opening is opened completely at the speed of 4 pulse every 5 seconds in opening after about 3 minutes passed. (1) 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). 1 The LEV correction is used properly for two kinds according to the LEV opening status at operation off. Opening immediately before having stopped last time Rank 100 pulse or less (Pulse) 100 pulse or more (Pulse) Ta (F-) Cooling Cooling more than Tb+18 5 20 Tb+9 to Tb+18 2 10 Tb+4 to Tb+9 1 2 Tb-4 to Tb+4 0 0 Tb-9 to Tb-4 -1 -2 Tb-18 to Tb-9 -2 -5 less than Tb-18 -5 -10 NOTE : Discharge temperature : Ta, Target discharge temperature : Tb 23 OB311--1.qxp 04.1.13 9:53 AM Page 24 2 When the temperature difference RT between indoor coil thermistor (main) RT12 and indoor coil thermistor (sub) RT13 in the indoor unit is 4deg. 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 6deg. 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. RT Ta (F-) less than 4deg. (Pulse) 4deg. or more and less than 6deg. (Pulse) 6deg. or more (Pulse) more than Tb+18 20 60 60 Tb+9 to Tb+18 10 20 20 Tb+4 to Tb+9 2 10 10 Tb-4 to Tb+4 0 0 0 Tb-9 to Tb-4 -2 -2 -2 Tb-18 to Tb-9 -5 -5 -5 less than Tb-18 -10 -10 -10 NOTE : Discharge temperature : Ta, Target discharge temperature : Tb The target discharge temperature (Tb) is set according to the operation mode or the unit status as follows. Operation mode Tb (-F) COOL (Normal) COOL ( RT is less than 4deg., or COOL ( RT is 6deg or more.) 171 RT is 4deg. or more and less than 6deg..) 144 136 NOTE : Target discharge temperature : Tb NOTE : When the discharge temperature (Ta) is 122°F or less on the cool operation LEV opening is set in 54 pulse. When this state continues for 20 minutes, the compressor is stopped and restarts in 3 minutes. When the compressor is stopped, the indoor unit indicates the abnormality of refrigerant system and stops. (OPERATION INDICATOR lamp is 10-time flashing on and off.) (2) LEV time chart LEV opening Open Close Opening Power ON completely Operation Remote ➔ controller ON Standard opening Initial opening Positioning Thermostat OFF Remote Opening ➔ Remote controller completely controller ON Operation OFF Standard opening Thermostat ON Operation Standard opening Initial opening Initial opening Opening in stop Opening in stop Positioning NOTE : Opening increases and decreases to be in the target discharge temperature during operation. 24 Time OB311--1.qxp 04.1.13 9:53 AM 9 Page 25 SERVICE FUNCTIONS MS24WN 9-1. 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 37.) Set time : 1 minute ➔ 1-second Set time : 3 minute ➔ 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is shortened by short circuit of JPG and JPS.) 9-2. 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 3 times at first. After finish remodelling, put back the batteries then press the RESET button. The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1. After modification, press the RESET button. Table 1 1 unit operation 2 units operation 3 units operation 4 units operation No. 1 unit No modification Same as at left Same as at left Same as at left No. 2 unit – Solder J1 Same as at left Same as at left No. 3 unit – – Solder J2 Same as at left No. 4 unit – – – Solder both J1 and J2 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. 25 OB311--1.qxp 04.1.13 9:53 AM Page 26 9-3. 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 the indoor electronic control P.C. board. When the main power is turned off and then turned back on, the unit restarts automatically in the memorized set conditions approximately after 3 minutes. How to release “AUTO RESTART FUNCTION” 1 Turn off the main power for the unit. 2 Pull out the indoor electronic control P.C. board and the display P.C.board. (Refer to page 40.) 3 Solder the Jumper wire or the Resistor 220Ω to the JR07 on the indoor electronic control P.C.board. (Refer to page 37.) Operation 1 If the main power (115V AC) has been cut, the operation settings remain. 2 After the power is restored, the unit restarts automatically according to the memory. (However, it takes at least 3 minutes for the compressor to start running.) C11 CN 21 1 CN201 SW1 RA102 CN151 CN121 CN112 CN111 TAB12 IC101 IC152 JR07 NOTE: •The operation settings are memorized when 10 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, 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. (time delay) 26 OB311--1.qxp 04.1.13 9:53 AM 10 Page 27 TROUBLESHOOTING MS24WN MU24WN 10-1. Cautions on troubleshooting 1. Before troubleshooting, check the following: 1) Check the power supply voltage. 2) Check the indoor/outdoor connecting wire for mis-wiring. 2. Take care the following during servicing. 1) 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. 2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board. 3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components. 4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. Lead wiring Housing point 3. Troubleshooting procedure 1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is flashing on and off before starting service work. 2) Before servicing check that the connector and terminal are connected properly. 3) If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration. 4) When troubleshooting, refer to the flow chart on page 28 and the check table on page 29. 4. 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. 1 Remove the front lid and insert batteries. Then reattach the front lid. 2 Press the RESET button. 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. 27 OB311--1.qxp 04.1.13 9:53 AM Page 28 10-2. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn't operate. w1. 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. 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 37. Refer to D "Check of outdoor unit" on page 33. Refer to E "Check of outdoor unit" on page 34. Refer to B "Check of remote controller and receiver P.C. board" on page 31. 1. Check indoor / outdoor connecting wire. 2. Refer to C "Check of indoor electronic control P.C. board" on page 32. Flash on and off at 0.5second intervals Cause: Indoor/ Outdoor unit • Mis-wiring 2-time flash Cause: Indoor unit • Trouble of room temperature/ indoor coil thermistor 3-time flash Cause: Indoor unit • Trouble of indoor fan motor 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 10-time flash Cause: Outdoor unit • Trouble of low discharge temperature protection Refer to F "How to check mis-wiring (When outdoor unit doesn't oper ate)" on page 35. Check room temperature thermistor and indoor coil thermistor. Refer to "Test point diagram and voltage" on page 37. Refer to A "Check of indoor fan motor" on page 31. Replace the indoor electronic control P.C. board. Refer to H "Check of outdoor thermistor" on page 36. Replace the deicer P.C. board. Refer to G "Check of LEV" on page 36. 28 OB311--1.qxp 04.1.13 9:53 AM Page 29 1. Troubleshooting check table • The following indication applies regardless of shape of the indicator. 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 lighted during normal operation. Before taking measures, make sure that the symptom reappears for accurate troubleshooting. Self check table No. Abnormal point Operation indicator lamp Symptom 0.5-second ON Outdoor unit does not operate. 1 Mis-Wiring Detection method Checkpoint 3 minutes after power supply turns ON, when serial signal is not received. • Refer to F "How to check mis-wiring" on page 35. Detect Indoor coil/room temperature thermistor short or open circuit every 8 seconds during operation. • Refer to the characteristics of main indoor coil thermistor, sub indoor coil thermistor, and room temperature thermistor on page 37. When rotational frequency feedback signal is not emitting during 12-second indoor fan operation. • Refer to A "Check of indoor fan motor" on page 31. 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. <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 10 minutes after compressor start-up. • Replace the deicer P.C. board. Refer to H "Check of outdoor thermistor" on page 36. • Reconnect the connector. When it cannot properly read data in the nonvolatile memory of the deicer P.C. board, outdoor unit stops. • Replace the deicer P.C. board. When discharge temperature has been 122°F or less on cool operation, or is 120°F or less on heat operation for 20 minutes. • Refer to G "Check of LEV" on page 36. • Check refrigerant circuit and refrigerant amount. 0.5-second OFF Indoor coil thermistor 2 Room temperature thermistor 2-time flash Outdoor unit does not operate. 2.5-second OFF Indoor fan repeats 12 seconds ON and 3 minutes OFF. When the indoor fan breaks, the fan keeps stopping. 3-time flash 3 Indoor fan motor 2.5-second OFF 4-time flash 4 Indoor control system Outdoor unit does not operate. 2.5-second OFF 6-time flash 5 Outdoor unit does not operate. Outdoor thermistors 2.5-second OFF 7-time flash 6 Outdoor unit does not operate. Outdoor control system 2.5-second OFF 10-time flash Low discharge 7 temperature protection Outdoor unit does not operate. 2.5-second OFF 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 on and off. 29 OB311--1.qxp 04.1.13 9:53 AM Page 30 2. Trouble criterion of main parts MS24WN MU24WN Check method and criterion Measure the resistance with a tester. (Part temperature 50˚F ~ 86˚F) Normal 8 k" ~ 20 k" Indoor coil thermistor (RT12(main), RT13(sub)) Ambient temperature thermistor(RT63) 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 32˚F ~ 104˚F) Normal 120 k" ~ 800k" Abnormal Open or short-circuit Measure the resistance with a tester. (Part temperature 14˚F ~ 104˚F) Normal 5 k" ~ 60 k" Abnormal Open or short-circuit Measure the resistance between the terminals with a tester. (Part temperature 14˚F ~ 104˚F) INNER PROTECTOR 320i 9-F OPEN 198i20-F CLOSE Terminal C–R C–S INNER PROTECTOR 275i 9-F OPEN 187i27-F CLOSE Outdoor fan motor(MF) INNER PROTECTOR 293i14-F OPEN 190i27-F CLOSE Horizontal vane motor(MV1) Vertical vane motor(MV2) Normal 0.74 " ~ 0.91 " 1.84 " ~ 2.26 " WHT C P AUX. MAIN Abnormal Open or short-circuit R S BLK RED Measure the resistance between the terminals with a tester. (Part temperature 50˚F ~ 86˚F) Color of lead wire WHT – BLK BLK – RED Normal 35 " ~ 39 " 65 " ~ 71 " Abnormal Open or short-circuit WHT MAIN RED AUX. BLK P Color of lead wire BRN – YLW YLW – GRY Normal 4.5 ~ 5.5V (When fan revolved one time) 0V➔5V➔0V (Approx.) GRY BRN Remain 0V or 5V Measure the resistance between the terminals with a tester. (Part temperature 14˚F ~ 104˚F) Abnormal Color of lead wire Normal WHT – BLK 51 " ~ 62 " Open or short-circuit BLK – RED 50 " ~ 61 " Measure the resistance between the terminal with a tester. (Part temperature 50°F ~ 86°F) Abnormal Open or short-circuit Normal 282" ~ 306 " YLW Abnormal BLK AUX. RED ORN MAIN WHT RED ROTOR YLW BRN GRN WHT6 Abnormal Open or short-circuit RED1 LEV ORN4 YLW5 Measure the resistance with a tester. (Part temperature : 14˚F ~ 104˚F) Normal Color of lead wire WHT – RED RED – ORN 30.3 " ~ 37.0 " YLW – BRN BRN – BLU 1 2 3 P ORN LEV(Expansion valve) 1 2 3 Measure the voltage power ON. Sensor part Indoor fan motor(MF) Motor part Compressor(MC) BLU3 Discharge temperature thermistor(RT62) Figure BRN2 Part name Room temperature thermistor(RT11) P :INNER PROTECTOR 30 OB311--2.qxp 04.1.13 10:01 AM Page 31 When OPERATION INDICATOR lamp flashes 3-time. Indoor fan motor doesn’t operate. Turn OFF the power supply. Check connector CN211 visually. A Check of indoor fan motor No Are lead wires connected? Yes Is soldering point of the connector correctly soldered? No Resolder it. Yes Reconnect the lead wires. Disconnect lead wires from connector CN211 on the indoor electronic control P.C. board. Measure resistance between lead wires : No.1 and No.4 and then No.3 and No.4. Is resistance 0 (short circuit) or ∞ (open circuit)? Yes ( 0 or ∞ ) No (others) Repair or replace the indoor fan motor. Turn ON the power supply. Stop it if the unit operate. Insert screwdriver into air outlet to rotate indoor fan motor slowly for 1 revolution or over, and measure voltage between No.2(+) and No.3(-) on CN121. No Does voltage repeat 0V DC and 5V DC? Yes Replace the indoor electronic control P.C. board. Indoor unit operates by pressing the EMERGENCY OPERATION switch, but doesn’t operate with the remote controller. B Check of remote controller and receiver P.C. board wCheck if the remote controller is exclusive for this air conditioner. Switch on the remote controller. Is LCD display on the remote controller displayed? No Replace the batteries.(Refer to page 27.) (not clear) Yes 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? No Turn on a radio to AM and press switch on the remote controller. Yes No OK Replace the remote controller. Is noise heard from radio? Yes Are there any fluorescent lights of inverter or rapid-start type within the range of 1m? Yes ● Reinstall the unit away from lights. ● Attach a filter on receiving part. No Measure the voltage between receiver P.C. board connector CN301 No.1(+) and No.3(-) when remote controller button is pressed. Yes Is the voltage approx. 4V DC? No(5V or 0V DC) Replace the receiver P.C. board. 31 Replace the indoor electronic control P.C. board. OB311--2.qxp 04.1.13 10:01 AM Page 32 The unit doesn’t operate with the remote controller. Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch. C Check of indoor electronic control P.C. board Check the both “parts side”and “pattern side” of indoor electronic control P.C. board visually. Varistor (NR11) Turn OFF the power supply. Remove indoor fan motor connector CN211 and vane motor connector CN151 from the indoor electronic control P.C. board and turn ON the power supply. Fuse (F11) Does the unit operate with the remote controller? Does the OPERATION INDICATORE lamp light up by pressing the EMERGENCY OPERATION switch? Indoor electronic control P.C. board No Yes Turn OFF the power supply. Replace the vane motor. Turn OFF the power supply. Yes Is winding resistance of vane motor 0 "? Yes No Be sure to check both resistance. Is winding resistance of fan motor 0 "? Replace the fuse. No Is fuse(F11) blown? Replace the indoor electronic control P.C. board. Be sure to check both fuse and varistor in any case. Is varistor(NR11) burnt? Yes Yes Replace the fan motor. No Replace the varistor. 32 No OB311--2.qxp 04.1.13 10:01 AM Page 33 Compressor and / or outdoor fan doesn’t operate. D Check of outdoor unit Turn ON the power supply. Is there 208/230V AC between L1 - L2 on the outdoor terminal block? No Check the outdoor power supply and connection of wiring. Yes Compressor does not operate. Is there 5V DC between J101 + - J401 on the outdoor electronic control P.C. board? w1 Yes No No Make the connection of wiring correct. Yes Operate the unit in COOL mode by pressing the EMERGENCY OPERATION switch. 3minutes after the power supply turns ON, is there 208/230V AC between A1-A2 on the compressor contactor(52C)? Yes Is there 208/230V AC between 2/T1 on the compressor contactor(52C) and L2 on the outdoor terminal block? Yes Is there 208/230V AC between CN730 1-3 on the outdoor electronic control P.C. board? w1 Replace the outdoor electronic control P.C. board. No No Check the compressor. Replace the outdoor electronic control P.C. board. Is there 208/230V AC between 1/L1 on the compressor contactor(52C) and L2 on the outdoor terminal block? Yes No Make the connection of wiring correct. Replace the compressor contactor. Outdoor fan motor does not operate. Is there 5V DC between J101 + - J401 on the outdoor electronic control P.C. board? w1 No Yes No Make the connection of wiring correct. Yes Operate the unit in COOL mode by pressing the EMERGENCY OPERATION switch. Is there 208/230V AC between CN711 2-3 on the outdoor electronic control P.C. board? w1 Is there 208/230V AC between CN730 1-3 on the outdoor electronic control P.C. board? w1 Replace the outdoor electronic control P.C. board. No Replace the outdoor electronic control P.C. board. Yes Check the outdoor fan motor. Refer to page 30. w1 Refer to page 38. 33 OB311--2.qxp 04.1.13 10:01 AM Page 34 Compressor and / or outdoor fan motor doesn’t stop. E Check of outdoor unit 1 Turn OFF the power supply. 2 After 30 seconds, turn ON the power supply again. 3 Operate the unit in COOL mode by pressing the EMERGENCY OPERATION switch. 4 Operate the unit for 1 minute or more and stop it by pressing the EMERGENCY OPERATION switch again. After 30 seconds, does compressor stop? No Yes Is there 208/230V AC between A1-A2 on the compressor contactor(52C)? Yes Ok Replace the outdoor electronic control P.C. board. After 30 seconds, does outdoor fan motor stop? No Replace the outdoor electronic control P.C. board. Yes Ok 34 No Is there 208/230V AC between 2/T1 on the compressor contactor(52C) and L2 on the outdoor terminal block? Yes Replace the compressor contactor(52C). No Make the connection of wiring correct. OB311--2.qxp 04.1.13 10:01 AM Page 35 When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second. Outdoor unit doesn’t operate. F How to check mis-wiring Start Turn OFF the power supply. Turn ON the power supply. No Rectify the wiring. Is the power voltage to terminal blocks of indoor/outdoor units normal? Yes Turn ON the EMERGENCY OPERATION switch. (any mode possible) After 3 minutes that power supply has been turned on, does the compressor start operating? Yes No Correct the mis-wiring. No Is the terminal blocks 1 and 3 on the indoor unit properly connected to their counter parts on outdoor unit? Yes Turn OFF the power supply. Check by using checking mode. 1Disconnect indoor/outdoor wiring (at indoor terminal blocks 1 and 3) 2Short circuit between indoor terminal blocks 1 and 3. Turn ON the power supply. 3While pressing the OPERATION SELECT button and the TOO COOL button on the remote controller, press the RESET button on the remote controller. 4Release the RESET button on the remote controller. (After 3 seconds, LCD on the remote controller displays all signs.) Press the OPERATE/STOP(ON/OFF) button on the remote controller to send signal. Make sure the unit emits a beep tone. No Replace the indoor electronic control P.C. board. ❈ Does the OPERATION INDICATOR lamp on the indoor unit flash on? Yes Replace the outdoor electronic control P.C.board. ❈ Before the unit resumes normal operation. •Release the checking mode by pressing the RESET button on the remote controller, and then send the unit signal to stop operation. •Turn OFF the power supply to indoor/outdoor units. •Get indoor terminal blocks 1 and 3 opened, and reconnect indoor/ outdoor wiring. sure to turn OFF the power supply to [ ❈ Be ] indoor/outdoor units in replacing P.C. board. 35 OK OB311--2.qxp 04.1.13 10:01 AM Page 36 When OPERATION INDICATOR lamp flashes 10-time. Cooling doesn’t operate. G Check of LEV (Expansion valve) 1 During pressing the OPERATION SELECT button and the TOO COOL button on the remote controller, press the RESET button. 2 First, release the RESET button. (After 3 seconds, confirm all displays of the remote controller.) 3 Then release the OPERATION SELECT button. 1 During pressing the OPERATION SELECT button and the TOO COOL button on the remote controller, press RESET button. 2 First, release the RESET button. With remote controller set toward the indoor unit, press the OPERATE/ STOP(ON/ OFF) button and confirm one beep tone. (After 3 seconds, confirm all displays of the remote controller.) 3 Then release the OPERATION SELECT button. ˚F CLOCK AMPM LEV operates in full-opening direction. Do you hear LEV "click, click·······"? Do you touch LEV and feel it vibrate? AMPM Yes Ok No Is LEV coil properly fixed to the body? No Properly fix LEV coil to the body. Yes Does the resistance of LEV coil have the characteristics? No Yes Characteristics of LEV coil LEV (CN724) Replace the LEV coil. Replace the outdoor electronic control P.C. board. Resistance WHT–RED RED–ORN YLW–BRN NOTE : After check of LEV, do the undermentioned operations. 1. Turn OFF the power supply of the unit and turn ON again. 30.3 " ~ 37.0 " 2. Press the RESET button on the remote controller. BRN–BLU When OPERATION INDICATOR lamp flashes 6-time. Thermistors in the outdoor unit are abnormal. H Check of outdoor thermistor w Disconnect the connectors CN662 from the outdoor electronic control P.C. board. (Check the characteristics of each thermistor.) Discharge temperature thermistor(RT62) Measure resistance between CN 662 1 and 2. Turn OFF the power supply. Ambient temperature thermistor(RT63) Replace the outdoor electronic control P.C. board. Does the resistance of thermistor have the characteristics on page 38? No Measure resistance between CN 662 3 and 4. Yes Connect CN662. Turn ON the power supply and press the EMERGENCY OPERATION switch. No Does the unit operate 10 minutes or more? Yes Ok W1. Replace the thermistor. W1. It is thought defective contact of the connector. 36 OB311--2.qxp 04.1.13 10:01 AM Page 37 TEST POINT DIAGRAM AND VOLTAGE MS24WN Indoor electronic control P.C. board Varistor(NR11) } Fan motor power supply } Power supply input 115V AC + Fuse (F11) 250V AC 3.15A } 5V DC Room temperature thermistor(RT11) Indoor coil thermistor(RT12(main)) Indoor coil thermistor(RT13(sub)) R132 Emergency operation switch Timer short mode point (JPS, JPG) (Refer to page 25.) + } Receiver P.C. board 12V DC Room temperature thermistor (RT11) Indoor coil thermistor[RT12(main), RT13(sub)] Auto restart function Solder the Jumper wire or the Resistor 220Ω to the JR07. (Refer to page 26.) 32 50 68 86 104 122 140 F 37 OB311--2.qxp 04.1.13 10:01 AM Page 38 MU24WN Outdoor electronic control P.C. board Ambient temperature thermistor (RT63) 100 Discharge temperature thermistor(RT62) 900 Resistance(k") 800 700 600 Resistance(k") 90 80 70 60 50 40 500 400 30 300 20 200 10 100 0 32 50 68 86 104 122 140 158 176 194 212 230 248 Temperature(-F) CN662 1-2 Discharge temperature thermistor (RT62) (Refer to page 36.) 0 -4 14 32 50 68 86 104 Temperature(-F) CN662 3-4 Ambient temperature thermistor (RT63) (Refer to page 36.) LEV connector (CN724) Fan motor connector (CN711) + } 12V DC Fuse (F61) 3.15A / 250V J101 + 5V DC J401 (Refer to page 33.) } } CN7301-3 208/230V AC (Refer to page 33.) 38 OB311--2.qxp 04.1.13 10:01 AM Page 39 RELAY OPERATION MS24WN COMPRESSOR CONTACTOR • EACH MODE MODE COOL & COOL mode of I FEEL CONTROL THERMOSTAT 52C CONTACTOR ON ON AUTO or set speed OFF OFF OFF for 2 min. after unit starts operation DRY & DRY mode of I FEEL CONTROL FAN INDOOR FAN SPEED ON Repeat of 8 min. ON/ 3min. OFF operation or 2 min. ON/3 min. OFF operation OFF Repeat of 4 min. OFF/ 1 min. ON operation OFF OFF AUTO or set speed AUTO or set speed links with 52C CONTACTOR AUTO or set speed NOTE : Once the compressor is OFF, “3-minute time delay circuit” works at next start-up. • COIL FROST PREVENTION MODE THERMOSTAT 52C CONTACTOR ON OFF for 5 min. After that, OFF is prolonged until indoor coil thermistor reads termination temperature. COOL & COOL mode of I FEEL CONTROL DRY & DRY mode of I FEEL CONTROL 39 INDOOR FAN SPEED AUTO or set speed AUTO or set speed OB311--2.qxp 11 04.1.13 10:01 AM Page 40 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 (1) and (2)) of the terminal with lock mechanism. The terminal with no lock mechanism can be removed by pulling it out. Check the shape of the terminal and work. (1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector is a terminal with lock mechanism. Sleeve Locking lever 1Slide the sleeve. 2Pull the terminal while pushing the locking lever. 1Hold the sleeve, and pull out the terminal slowly. Connector 11-1. MS24WN INDOOR UNIT PHOTOS OPERATING PROCEDURE 1. Removing the front panel (1) Remove the screw caps of the front panel. Remove the screws. (2) Pull the panel down to your side slightly and unhook the catches at the top. Photo 1 Front panel Screws 2. Removing the electronic control P.C. board, the receiver P.C. board and the display P.C. board NOTE : In case of removing only indoor electronic control P.C. board work (2) and (3) are not necessary. (1) Remove the front panel. (Refer to 1.) (2) Remove the R.L holder from the bottom of electrical box. (3) Open the R.L holder, remove the receiver P.C. board and the display P.C. board. (4) Remove the screw of the electrical cover and the electrical cover. (5) Pull out indoor electronic control P.C. board slightly. (6) Disconnect all the connectors on the electronic control P.C. board. (7) Remove the electronic control P.C. board. Photo 2 Indoor electronic control P.C.board Screw of the electrical cover R.L Screw of holder the corner box 40 Receiver P.C. board OB311--2.qxp 04.1.13 10:02 AM Page 41 OPERATING PROCEDURE PHOTOS 3. Removing the electrical box (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Disconnect the connector of the indoor coil thermistor (CN112), the fan motor connector (CN211 and CN121) and the vane motor connector (CN151) on the electronic control P.C. board. (4) Remove the screw of ground wire. (5) Remove the fan motor lead wire, indoor coil thermistor and ground wire from the electrical box. (6) Remove the lead wire of vane motor from the bottom of electrical box. (7) Remove the screw of corner box and corner box. (Photo 2) (8) Remove the screw of conduit cover and conduit cover. (9) Remove the screws fixing the conduit plate. (10) Pull out the conduit plate and the indoor/ outdoor unit connecting wire. (11) Remove the lock nut from the connector of indoor/ outdoor connecting wire. (12) Remove the screw fixing the electrical box, remove the electrical box. 4. Removing the vane motor (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical cover. (Refer to 2.) (3) Remove the lead wire of Photo 5 vane motor. (Refer to 3.) (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 3 Screws of the ground wire Fan motor connectors Indoor coil thermistor connector Vane motor connector Screw of the electrical box Screws of the conduit plate Screw of the conduit cover Photo 4 Vane motors Screws of the vane motor Vane motor 5. Removing the line flow fan and the indoor fan motor (1) Remove the front panel. (Refer to 1.) (2) Remove the electrical box. (Refer to 3.) (3) 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.) Photo 8 (8) Remove the screws fixing the left side of the heat exchanger. (9) Lift the left side of the heat exchanger. (10) Remove the line flow fan. Photo 6 Screws fixing the left side of the heat exchanger Photo 7 Indoor coil thermistor Water cut Screws fixing the fan motor Hole cover 41 Screws of the vane motor OB311--2.qxp 04.1.13 10:02 AM Page 42 11-2. MU24WN OUTDOOR UNIT OPERATING PROCEDURE PHOTOS 1. Removing the cabinet (1) Remove the screws of the top panel and the top panel. (2) 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. (3) 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. Photo 1 Screws of the top panel Photo 2 Discharge pipe Cover panel Screw of the service panel Suction pipe Screws of the cabinet 2. Removing the outdoor electronic control P.C. board (1) Remove the top panel, the service panel and the cover panel. (2) Disconnect all the connectors and the terminals on the outdoor electronic control P.C. board. (3) Remove the outdoor electronic control P.C. board. Relay panel Fan motor connector Photo 3 Outdoor electronic control P.C. board Compressor contactor Terminal blocks 3. Removing the propeller and the outdoor fan motor (1) Remove the cabinet. (Refer to 1.) (2) Remove the propeller nut and the propeller. NOTE:Loose the propeller in the rotating direction for removal. When attaching the propeller, align the mark on the propeller and the motor shaft cut section. Set the propeller in position by using the cut on the shaft and the mark on the propeller. (3) Remove the lead clamps and disconnect the outdoor fan motor connector. (Photo 3) (4) Remove the screws of the outdoor fan motor and the outdoor fan motor. Photo 4 Screws Lead of the clamps fan motor Screw of the side panel Screws of the valve bed Propeller Propeller nut Screw of the side panel Screws of the motor support 42 Screw of the separator support plate Screw of the separator OB311--2.qxp 04.1.13 10:02 AM Page 43 OPERATING PROCEDURE PHOTOS 4. Removing the heat exchanger and compressor (1) 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. (2) Remove the screws of the side panel and the side panel. (Photo 4) (3) 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. (Photo 4) (5) Remove the screws of the motor support and the motor support. (Photo 4) (6) Remove the relay panel. (Photo 3) (7) Remove the fan motor lead wire from lead clamps. (Photo 4) (8) Remove the soundproof felt. (9) Remove the screws of the separator and the separator. (10) Recover gas from the refrigerant circuit. (11) Remove the heat exchanger. Detach the welded part of pipe. (12) Remove the nuts of the compressor and the compressor. Detach the welded part of the suction pipe and the discharge pipe. (Photo 2) Photo 5 Screws of the rear guard Screws of the rear panel Screws of the rear guard Photo 6 Heat exchanger Accumulator Photo 7 Screw of the separator Stop valve Compressor Soundproof felt 43 OB311--2.qxp 12 04.1.13 10:02 AM Page 44 PARTS LIST MS24WN (W) 12-1. INDOOR UNIT STRUCTURAL PARTS 12-2. INDOOR UNIT HEAT EXCHANGER 1 2 10 3 8 4 Optional parts (See back cover.) CATCH 5 SCREW CAP 11 12 6 7 12-1. INDOOR UNIT STRUCTURAL PARTS Part number that is circled is not shown in the illustration. NO. 1 2 3 4 5 6 7 8 9 Part No. E02 E02 E02 E02 E02 E02 E02 E02 E02 527 527 527 408 527 527 527 527 530 970 234 000 142 067 010 100 975 007 Part Name Symbol in Wiring Diagram Q'ty/unit MS24WN (W) 1 1 1 4 3 1 2 1 1 INSTALLATION PLATE BOX (W) FRONT PANEL ASSEMBLY (W) CATCH SCREW CAP (W) GRILLE (W) AIR FILTER CORNER BOX RIGHT LAMP PANEL Remarks Including No.4,5,6 4PCS/ SET 3PCS/ SET 12-2. INDOOR UNIT HEAT EXCHANGER 1 1 1 10 E02 527 620 INDOOR HEAT EXCHANGER 11 E02 527 666 UNION (GAS) 12 E02 527 667 UNION (LIQUID) 44 {5/8 {3/8 OB311--2.qxp 04.1.13 10:02 AM Page 45 MS24WN (W) 12-4. ACCESSORY AND REMOTE CONTROLLER 12-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS 20 1 19 23 24 2 3 SLEEVE BEARING 4 12 18 11 ROOM TEMPERATURE THERMISTOR 5 6 13 14 10 7 FUSE 8 9 VARISTOR 15 16 17 12-3. INDOOR UNIT FUNCTIONAL PARTS AND ELECTRICAL PARTS Part numbers that are circled are not shown in the illustration. NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Part No. E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 527 408 001 408 527 527 527 784 784 527 784 448 408 527 528 527 784 527 545 527 528 529 302 509 504 702 235 040 041 382 385 034 300 303 303 333 329 468 452 308 375 307 034 034 Part Name Symbol in Wiring Diagram LINE FLOW FAN BEARING MOUNT SLEEVE BEARING DRAIN HOSE NOZZLE ASSEMBLY VANE UPPER (W) VANE LOWER (W) F11 FUSE NR11 VARISTOR VANE CRANK SET MF INDOOR FAN MOTOR ASSEMBLY MV2 VANE MOTOR (VERTICAL) MV1 VANE MOTOR (HORIZONTAL) MOTOR BAND DISPLAY P.C. BOARD RECEIVER P.C. BOARD ELECTRONIC CONTROL P.C. BOARD RT11 ROOM TEMPERATURE THERMISTOR TB TERMINAL BLOCK RT12, RT13 INDOOR COIL THERMISTOR VANE MOTOR SUPPORT SET(RIGHT) VANE MOTOR SUPPORT SET(LEFT) Q'ty/unit MS24WN (W) 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 12-4. ACCESSORY AND REMOTE CONTROLLER 1 1 23 E02 784 426 REMOTE CONTROLLER 24 E02 527 083 REMOTE CONTROLLER HOLDER 45 Remarks 3.15A RC4W33 Including RUBBER MOUNT RIGHT & LEFT UP & DOWN AUTO RESTART Including No.16 OB311--2.qxp 04.1.13 10:02 AM Page 46 MU24WN 12-5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS 30 31 9 29 1 28 2 3 4 5 6 27 26 7 25 8 19 11 A B 18 12 2 13 9 15 16 17 24 14 10 20 46 21 22 23 OB311--2.qxp 04.1.13 10:02 AM Page 47 MU24WN 12-5. OUTDOOR UNIT STRUCTURAL PARTS, ELECTRICAL PARTS AND FUNCTIONAL PARTS Part numbers that are circled are not shown in the illustration. NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 Part No. E02 E02 E02 E02 E02 E07 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E07 E07 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 E02 813 528 527 784 214 070 813 813 819 784 528 527 527 784 527 527 001 012 474 813 813 480 481 784 784 544 128 784 813 813 814 527 784 262 527 784 297 309 630 301 501 508 290 232 009 521 493 640 506 900 662 661 641 641 642 245 006 374 374 351 340 353 383 451 522 523 249 515 382 936 936 936 Part Name Symbol in Wiring Diagram TOP PANEL RT62, RT63 THERMISTOR OUTDOOR HEAT EXCHANGER MF OUTDOOR FAN MOTOR PROPELLER PROPELLER NUT BASE CABINET HANDLE FAN GUARD LEV EXPANSION VALVE COIL EXPANSION VALVE COMPRESSOR RUBBER SET MC COMPRESSOR STOP VALVE (LIQUID) STOP VALVE (GAS) SERVICE PORT SERVICE PORT FUSIBLE PLUG SERVICE PANEL COVER PANEL TB1 TERMINAL BLOCK TB2 TERMINAL BLOCK C2 OUTDOOR FAN CAPACITOR COMPRESSOR CONTACTOR 52C COMPRESSOR CAPACITOR C1 SURGE ABSORBER DSAR OUTDOOR ELECTRONIC CONTROL P.C. BOARD REAR PANEL REAR GUARD SIDE PANEL MOTOR SUPPORT F61 FUSE CAPILLARY TUBE CAPILLARY TUBE CAPILLARY TUBE (TAPER PIPE) 47 Q'ty/unit MU24WN 1 1 1 1 1 1 1 1 3 1 1 1 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Remarks NEW WHITE(Brighter) DISCHARGE, AMBIENT RA6N66- NEW WHITE(Brighter) NEW WHITE(Brighter) NEW WHITE(Brighter) NEW WHITE(Brighter) 4RUBBERS/SET PH33NPBT {3/8 {5/8 NEW WHITE(Brighter) NEW WHITE(Brighter) 4P (FIGURE A) 4P (FIGURE B) 5.0+/440VAC 35+/370VAC NEW WHITE(Brighter) NEW WHITE(Brighter) NEW WHITE(Brighter) 250V/3.15A {0.16✕{0.09✕7-7/8 {0.16✕{0.09✕3-15/16 {0.14✕{0.09✕1-31/32 OB311--2.qxp 13 04.1.13 10:02 AM Page 48 OPTIONAL PARTS 13-1. REFRIGERANT PIPES The air conditioner has flared connections its on indoor and outdoor sides. Please use the optional extension pipe as follows. Model Part No. Pipe length MAC-860PI MAC-861PI MAC-862PI MAC-863PI MAC-864PI MS24WN MU24WN 13-2. AIR CLEANING FILTER 10ft. 16ft. 23ft. 33ft. 49ft. , Pipe size A-Gas(in.) B-Liquid(in.) Crosssection Outside Wall Outside Wall diameter thickness diameter thickness 5/8 0.0315 3/8 0.0285 Additional refrigerant Insulation charge (in.) R22(oz.) C 1-7/32 D 1-1/16 0 1.3 3.9 ● AIR CLEANING FILTER removes fine dust of 0.01 micron from air by means of static electricity. ● Normal life of AIR CLEANING FILTER is 4 months. However, when it becomes dirty, replace it as soon as possible. ● Clogged AIR CLEANING FILTER may reduce the air conditioner capacity or cause frost on the air outlet. ● DO NOT reuse AIR CLEANING FILTER even if it is washed. ● DO NOT remove or attach AIR CLEANING FILTER during unit operation. Model Part No. MS24WN MAC-1700FT Air cleanig filter (White bellow type) 13-3. DEODORIZING FILTER ● DEODORIZING FILTER removes ammonia and hydrogen sulphide emitted from tobacco, and odor of pets. ● Clean DEODORIZING FILTER every two weeks. If the filter is particularly dirty, clean the filter more often. ● For cleaning, soak the filter in warm water for a while, and then wash and rinse it. Dry the filter in the shade thoroughly. ● When the filter color is still dark even after cleaning, replace the filter with a new one. Replace the filter at least once a year. Model Part No. MS24WN MAC-2200DF ● DEODORIZING FILTER and AIR CLEANING FILTER can be attached on either side. Deodorizing filter (Gray sponge type) . CCopyright 2003 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD. Distributed in Jan. 2004. No. OB311 REVISED EDITION-A 6 Distributed in Mar. 2003. No. OB311 17 New publication, effective Jan. 2004 Specifications subject to change without notice. 3400 Lawrenceville Suwanee Road ● Suwanee, Georgia 30024 Toll Free: 800-433-4822 ● Toll Free Fax: 800-889-9904 www.mrslim.com Specifications are subject to change without notice.