User manual MITSUBISHI MSC-A09YV - SERVICE MANUAL

SPLIT-TYPE, AIR CONDITIONERS SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS HFC utilized No. OB329 SERVICE MANUAL Wireless type Models R410A MSC-A07YV MSC-A09YV MSC-A12YV - E1 (WH) (WH) (WH) E1 E1 CONTENTS 1. TECHNICAL CHANGES ····································3 2. PART NAMES AND FUNCTIONS······················3 3. SPECIFICATION·················································5 4. NOISE CRITERIA CURVES ·······························6 5. OUTLINES AND DIMENSIONS ·························7 6. WIRING DIAGRAM ············································8 7. REFRIGERANT SYSTEM DIAGRAM ················8 8. MICROPROCESSOR CONTROL ······················9 9. SERVICE FUNCTIONS ····································17 10. TROUBLESHOOTING······································19 11. DISASSEMBLY INSTRUCTIONS·····················26 12. PARTS LIST······················································28 Indication of model name MSC-A07YV MSC-A09YV MSC-A12YV - E1 E1 E1 NOTE: ·This manual describes technical data of indoor units. ·As for outdoor units MU-A07/A09/A12YV - E1 , refer to the service manual OB330. ·As for outdoor units MUH-A07/A09/A12YV - E1 , refer to the service manual OB331. ·As for outdoor units MUX-A10/A19/A20/A25/A26WV - E1 , refer to the service manual OB307 REVISED EDITION-A. ·As for outdoor units MUX-A22WV - E1 , refer to the service manual OB318. ·As for outdoor units MXZ-A18/A26/A32WV - E1 , refer to the service manual OB319. 1 TECHNICAL CHANGES MSC-A07WV- E1 MSC-A07YV- E1 MSC-A09WV- E1 MSC-A09YV- E1 MSC-A12WV- E1 MSC-A12YV- E1 1. Design of front panel has changed. 2. Air filter has changed to the catechin air filter. 2 PART NAMES AND FUNCTIONS MSC-A07YV - E1 MSC-A09YV - E1 MSC-A12YV - E1 INDOOR UNIT Air cleaning filter (white bellows type) Front panel Air inlet Panel Catechin air filter (With deodorizer) to Breaker Power supply cord Remote control receiving section Air outlet Vertical vanes Fan Horizontal vane Remote controller Operation section (When the front panel is opened) Display section Operation indicator lamp Emergency operation switch Remote control receiving section 3 MSC-A07YV- E1 MSC-A09YV- E1 MSC-A12YV- E1 ACCESSORIES 1 Installation plate 2 Installation plate fixing screw 4 o 25 mm 3 Remote controller holder 4 Fixing screw for 3 3.5 o 16 mm 5 Battery (AAA) for remote controller 6 Wireless remote controller 7 Felt tape (Used for left or left-rear piping) 8 Air cleaning filter 1 5 1 2 2 1 1 1 REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE /STOP (ON /OFF)button AM PM TOO ON/OFF WARM TOO COOL TEMPERATURE buttons Open the front lid. Indication of remote controller model is on back. CLOCK PM AM TOO ON/OFF WARM TOO COOL FAN SPEED CONTROL button I FEEL COOL HEAT /FAN FAN VANE DRY STOP START HR. MIN. / MODE OPERATION SELECT button ECONO COOL ECONO COOL button RESET button RESET CLOCK OFF-TIMER button ON-TIMER button HR. button MIN. button (TIME SET button) CLOCK SET button VANE CONTROL button 4 3 SPECIFICATION Indoor model Function Indoor unit power supply MSC-A09YV - E1 MSC-A12YV - E1 MSC-A07YV - E1 Heating Heating Cooling Heating Cooling Cooling Single phase Single phase Single phase 230V,50Hz 230V,50Hz 230V,50Hz 474/372 w/276 w 510/420 w /342w 474/384 w/306w 588/456 w/342w 582/444 w/324w 606/498 w/396w 10 10 10 0.17 0.17 0.19 35 35 40 90 90 92 0.17 0.17 0.19 RC4V19-LA RC4V19-LA RC4V19-KA WHT-BLK 413 WHT-BLK 413 WHT-BLK 316 BLK-RED 334 BLK-RED 334 BLK-RED 299 815O278O244 815O278O244 815O278O244 9 9 10 5 5 5 36/31w /25 w 36/31 w /25 w 36/31w /25 w 39/32w/25 w 40/33w/26 w 39/33w/26 w 900/750w/600 w 950/820 w /700 w 900/770w/650w 1,050/870w/700w 930/760w/600w 960/830w/700 w 3 3 3 10 10 10 10 10 10 KP1A or KG3A KP1A or KG3A KP1A or KG3A Capacity Air flow(High/Med.w/Low w) Power outlet Running current Power input Power factor Fan motor current Model Winding resistance(at 20:) Dimensions WOHOD Weight Air direction Sound level(High/Med.w/Loww ) Fan speed(High/Med.w/Loww ) Fan speed regulator Thermistor RT11(at 25:) Thermistor RT12(at 25:) Remote controller model Fan motor Electrical data Special remarks K /h A A W % A " mm kg dB rpm k" k" NOTE: 1. Test conditions are based on ISO 5151. Cooling : Indoor DB27°C WB19°C Heating : Indoor DB20°C Outdoor DB35°C WB24°C OutdoorDB 7°C/WB 6°C Indoor-Outdoor piping length 5m 2.Remote controller model KP1A and KG3A are the same in terms of specification. W Reference value 5 4 NOISE CRITERIA CURVES E1 FAN SPEED FUNCTION High COOL HEAT SPL(dB(A)) 36 LINE MSC-A07YV- MSC-A09YV- E1 FAN SPEED FUNCTION High COOL HEAT SPL(dB(A)) 36 39 LINE Test conditions, Cooling : DB27: Heating : DB20: 90 WB19: WB -: 90 Test conditions. Cooling : DB27: Heating : DB20: WB19: WB -: OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR 70 NC-70 OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR 80 80 70 NC-70 60 NC-60 60 NC-60 50 NC-50 50 NC-50 40 NC-40 40 NC-40 30 NC-30 30 NC-30 20 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE 20 NC-20 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC-20 10 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz 10 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz MSC-A12YV- E1 FAN SPEED FUNCTION High COOL HEAT SPL(dB(A)) 40 39 LINE Test conditions, Cooling : DB27: 90 WB19: OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR 80 70 NC-70 60 NC-60 50 NC-50 40 NC-40 INDOORUNIT WALL 1m NC-30 30 0.8m 20 APPROXIMATE TERESHOLD OF HEARING FOR CONTINUOUS NOISE NC-20 10 63 125 250 500 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz MICROPHONE 6 5 OUTLINES AND DIMENSIONS Unit: mm INDOOR UNIT Installation plate 231.5 2.5 41 81.5 326 326 81.5 242 7 or more 5 Air in Indoor unit 783 42 Wall hole [65 815 Installation plate 278 { 90 110 244 Liquid line [6.35-0.5m Gas line [9.52-0.43m Insulation [37 O.D [21 I.D Drain hose [16 (Connected part O,D) Insulation [28 58 162 19 Power supply cord Lead to right 1.0m Lead to left 0.3m Air out Wireless remote controller MSC-A12YV - E1 INDOOR UNIT Installation plate 218.5 41 2.5 326 326 81.5 242 7 or more 5 Installation plate Air in 783 Indoor unit 81.5 Wall hole [65 815 278 { 90 110 244 Liquid line [6.35-0.5m Gas line [9.52-0.43m Insulation [37 O.D [21 I.D 30 60 606 149 58 162 19 Power supply cord Lead to right 1.0m Lead to left 0.3m Air out Drain hose [16 (Connected part O,D) Insulation [28 Wireless remote controller 7 42 258 17.5 161.5 30 60 606 149 161.5 271 4.5 MSC-A07YV - E1 MSC-A09YV - E1 81.5 133.5 6 WIRING DIAGRAM MSC-A09YV - E1 MSC-A12YV - E1 MODELS WIRING DIAGRAM BRN RED BLU WHT BLK CN LD103 151 MSC-A07YV - E1 INDOOR UNIT TO OUTDOOR TB UNIT L CONNECTING BRN FOR 3 MUH OR MXZ TYPE N 12V FOR MU OR MUX TYPE 12V POWER SUPPLY CORD ~/N 230V 50Hz 2 1 BLU TAB12 CN201 3 2 1 CN202 2 1 CN 101 CN 112 RT12 RT11 3 BLK GRY YLW BRN WHT RED T11 NR11 CN 111 CN 121 C11 F11 SR141 1 3 5 1 2 3 MF 4 5 6 CN211 ELECTRONIC CONTROL P.C. BOARD GRN 5 5 POWER MONITOR, RECEIVER P.C.BOARD REMOTE CONTROLLER GRN/YLW PE MV CIRCUIT BREAKER SYMBOL C11 F11 MF MV NAME SYMBOL NR11 RT11 RT12 SR141 VARISTOR NAME ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR SOLID STATE RELAY SYMBOL TB T11 NAME TERMINAL BLOCK TRANSFORMER INDOOR FAN CAPACITOR FUSE(3.15A) INDOOR FAN MOTOR (INNER FUSE) VANE MOTOR 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 7 REFRIGERANT SYSTEM DIAGRAM MSC-A09YV - E1 Refrigerant pipe [9.52 (with heat insulator) MSC-A07YV - E1 INDOOR UNIT MSC-A12YV - E1 INDOOR UNIT Unit:mm Refrigerant pipe [12.7 (with heat insulator) Indoor heat exchanger Indoor coil thermistor RT12 Flared connection Indoor heat exchanger Indoor coil thermistor RT12 Flared connection Room temperature thermistor RT11 Room temperature thermistor RT11 Flared connection Flared connection Refrigerant flow in cooling Refrigerant pipe [6.35 (with heat insulator) 8 Refrigerant flow in cooling Refrigerant pipe [6.35 (with heat insulator) 8 MICROPROCESSOR CONTROL MSC-A07YV - E1 MSC-A09YV - E1 MSC-A12YV - E1 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, 3-minute time delay will operate to protect system from overload and compressor will not restart for 3 minutes. WIRELESS REMOTE CONTROLLER Signal transmitting section INDOOR UNIT DISPLAY SECTION Operation Indicator lamp The operation indicator at the right side of the indoor unit indicates the operation state. Operation display section OPERATE /STOP (ON /OFF)button AM PM · The following indication does not depend on the shape of lamp. TOO ON/OFF WARM TOO COOL Operation Indicator TEMPERATURE buttons lighted not lighted Open the front lid. Indication Operation state Difference between target temperature and room temperature CLOCK PM AM TOO ON/OFF WARM TOO COOL FAN SPEED CONTROL button I FEEL COOL HEAT /FAN FAN VANE DRY STOP START HR. MIN. / MODE OPERATION SELECT button ECONO COOL ECONO COOL button RESET button RESET CLOCK OFF-TIMER button ON-TIMER button HR. button MIN. button (TIME SET button) CLOCK SET button VANE CONTROL button 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. Approx. 2 : or more Approx. 2 : or less 8-1. COOL ( ) 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 16 ~ 31°C Difference between room temperature and set tem1. Thermostat control perature during operation Thermostat is ON or OFF by difference between room temperature and set temperature Initial temperature difference Thermostat Room temperature minus set temperature : 0.3 : or more················································ON Room temperature minus set temperature : less than -0.3 :············································OFF Set temperature -0.3 : 0.3 : 2. Indoor fan speed control Indoor fan operates continuously at the set speed by FAN SPEED CONTROL button regardless of thermostat's OFF-ON. Difference between room In Auto the fan speed is as follows. temperature and set temFan speed Initial temperature difference perature during operation Room temperature minus set temperature : 1.7 degrees or more·······························High Room temperature minus set temperature : Between 1 and 1.7 degrees···················Med. 3 deg. Room temperature minus set temperature : less than 1 degree··································Low 1 deg. 1.7 deg. 9 3. Coil frost prevention x Temperature control When the indoor coil thermistor RT12 reads 4°C or below(MSC-A07/A09YV) / 0°C or below(MSC-A12YV) for 5 minutes, the coil frost prevention mode starts. The indoor fan operates at the set speed and the compressor stops for 5 minutes. After that, if RT12 still reads below 4°C (MSC-A07/A09YV) / 0°C (MSC-A12YV), this mode is prolonged until the RT12 reads over 4°C (MSC-A07/A09YV) / 0°C (MSC-A12YV). y Time control When the three conditions as follows have been satisfied for 1 hour and 45 minutes, the compressor stops for 3 minutes. The indoor fan operates at the set speed. a. Compressor has been continuously operating. b. Indoor fan speed is Low or Med. c. Room temperature is below 26°C. When compressor stops, the accumulated time is cancelled. 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 26°C. However, when two of the above conditions (b.and c.) are satisfied again, time accumulation is resumed. Operation chart Example ON Compressor Outdoor fan OFF OFF ON Indoor fan ON ( continuously at set speed) Set temperature and : initial room temperature in dry mode 35 30 Set temperature 25 20 15 8-2. DRY ( ) 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. DRY operation will not function when the room temperature is 13°C or below. (4) When DRY operation functions the fan speed is lower than COOL operation except at (fan speed) Low. 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. 10 10 15 20 25 30 Initial room temperature 35 : Difference between room temperature and set tem1. Thermostat control perature during operation Thermostat is ON or OFF by difference between room temperature and set temperature. Initial temperature difference Thermostat Set temperature Room temperature minus set temperature : 0.3 : or more················································ON Room temperature minus set temperature : less than -0.3 :············································OFF -0.3 : 0.3 : 2. Indoor fan speed control Indoor fan operates at the set speed by FAN SPEED CONTROL button. In Auto fan speed becomes Low. 3. The operation of the compressor and indoor / outdoor fan Compressor operates by room temperature control and time control. Indoor fan and outdoor fan operate in the same cycle as the compressor. q When the room temperature is 23°C 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. q When the room temperature is under 23°C. 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. 10 Operation time chart Example Thermostat OFF ON OFF ON ON Indoor fan OFF ON Outdoor fan Compressor OFF 8 min. OFF OFF ON OFF ON OFF ON ON 3 min. 4 min. 1 min. 4. Coil frost prevention The operation is as same as coil frost prevention during COOL operation.(Refer to 8-1.3.) However when coil frost prevention works while the indoor fan is OFF, its speed becomes set speed. 8-3. FAN ( ) 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. (3) Select the desired fan speed. When AUTO, it becomes Low. Only indoor fan operates. Outdoor unit does not operate. 8-4. HEAT ( ) OPERATION (1) Press OPERATE/STOP(ON/OFF) button. OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone. (2) Select HEAT 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 16 ~ 31°C. Difference between room temperature and set tem1. Thermostat control perature during operation Thermostat is ON or OFF by difference between room temperature and set temperature. Set temperature Initial temperature difference Thermostat -0.3 deg. Room temperature minus set temperature : less than -0.3 :··············································ON Room temperature minus set temperature : 0.3 : or more·················································OFF 0.3 deg. 2. Indoor fan speed control (1) 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 Set temperature minus room temperature: 1.7 degrees or more·············································· High Set temperature minus room temperature: Between 1 and 1.7 degrees ·································· Med. Set temperature minus room temperature: less than 1 degree················································· Low Difference between room temperature and set temperature during operation 3 deg. 1 deg. 1.7 deg. (2) Cold air prevention control 1 When the compressor is not operating, (1) if the temperature of indoor coil thermistor RT12 is 0°C or less, the fan stops. (2) if the temperature of indoor coil thermistor RT12 is more than 0°C, the fan operates at Very Low. 2 When the compressor is operating, (1) if the temperature of RT12 is 22°C or more, the fan operates at set speed. (2) if the temperature of RT12 is less than 22°C and (1) if the temperature of room temperature thermistor RT11 is 15°C or less, the fan stops. (2) if the temperature of room temperature thermistor RT11 is more than 15°C, the fan operates at Very Low. Released Cold Air Prevention Fan speed Set speed Very Low or stop 18: 22: NOTE : If the temperature of RT12 reads from 18°C to 22°C at the air conditioner stating and also after defrosting, this control works. 11 (3) Warm air control. When the following any condition of 1 (a. ~ c.) and the condition of 2 are satisfied at the same time, warm air control works. 1 a.) When outdoor unit starts operating in HEAT mode. b.) When cold air prevention has been released. c.) When defrosting has been finished 2 When the temperature of indoor coil thermistor RT12 is less than 37°C. When warm air control works, the fan speed changes as follows to blow out warm air gradually. Gradation of fan speed in initial less than 2 minutes 2 minutes to 4 minutes more than 4 minutes Low Med. High The upper limit of the fan speed in MANUAL is the set speed. The upper limit of the fan speed in AUTO is the speed decided by indoor fan speed control.(Refer to 8-4.2.(1).) When the temperature of RT12 has been 37°C or more, or when the set speed has been changed, this control is released and the fan speed is the set speed. NOTE: As for high pressure protection, defrosting and R.V. coil control, refer to service manual for outdoor unit. 8-5. "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 "I FEEL CONTROL"( ) mode with the OPERATION SELECT button. (3) The operation mode is determined by the initial room temperature at start-up of the operation, as shown on the right table. Initial room temperature MU & MUX type MUH &MXZ type 25: or more 25: or more Mode COOL mode of "I FEEL CONTROL" DRY mode of "I FEEL CONTROL" HEAT mode of "I FEEL CONTROL" more than13:, 23:or more, less than 25: less than 25: less than 23: q Once the mode is fixed, the mode does not change by room temperature afterwards. q Under the ON-TIMER ( ) operation, mode is determined according to the room temperature at set time the operation starts. q 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 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 2 hours and more, the operation mode is determined by the room temperature at start-up of the operation. Operation time chart Restart Example COOL or DRY or HEAT mode of "I FEEL Previous operation CONTROL" that deterCOOL mode of mined by room tem"I FEEL CONTROL" perature at start-up of the operation. or COOL mode 12 (4) The initial set temperature is decided by the initial room temperature. Initial room temperature MU & MUX type 26: or more 25: or more, less than 26: MUH & MXZ type 26: or more 25: or more, less than 26: 23: or more, less than25: less than 23: Mode Initial set temperature 24: g1 Initial room temperature minus 2: Initial room temperature minus 2: 26: COOL mode of "I FEEL CONTROL" DRY mode of "I FEEL CONTROL" HEAT mode of "I FEEL CONTROL" more than 13:, less than 25: g1 When the system is restarted with the remote controller, the system operates with the previous set temperature regardless of the room temperature at restart. (5) TEMPERATURES 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. q 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 1~2 degrees(°C) TOO WARM ... To lower the set temperature 1~2 degrees(°C) 8-5-1. COOL mode of "I FEEL CONTROL" 1. Thermostat control Thermostat control is as same as COOL OPERATION.(8-1.1.) 2. Indoor fan speed control Indoor fan speed control is as same as COOL OPERATION.(8-1.2.) 3. Coil frost prevention Coil frost prevention is as same as COOL OPERATION.(8-1.3.) 8-5-2. DRY mode of "I FEEL CONTROL" 1. Thermostat control Thermostat control is as same as DRY OPERATION.(8-2.1.) 2. Indoor fan speed control Indoor fan speed control is as same as DRY OPERATION.(8-2.2.) 3. The operation of the compressor and indoor/outdoor fan The operation of the compressor and indoor/outdoor fan is as same as DRY OPERATION.(8-2.3.) 4. Coil frost prevention Coil frost prevention is as same as DRY OPERATION.(8-2.4.) 8-5-3. HEAT mode of "I FEEL CONTROL" 1. Thermostat control Thermostat control is as same as HEAT OPERATION.(8-4.1.) 2. Indoor fan speed control Indoor fan speed control is as same as HEAT OPERATION.(8-4.2.) NOTE: As for high pressure protection, defrosting and R.V. coil control, refer to service manual for outdoor unit. 13 8-6. 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 Med. Low High (2) Fan motor lock-up protection When the rotational frequency feedback signal is 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 21.) 8-7. AUTO VANE OPERATION (1) 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. 12V) transmitted from indoor microprocessor. (2) The horizontal vane angle and mode changes as follows by pressing the VANE CONTROL button. (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. (b) When the vane control is changed from AUTO to MANUAL. (c) When the SWING is finished. (d) When the test run starts. (e) When the power supply turns ON. (4) VANE AUTO ( ) mode In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room-temperature distribution. 1 In COOL and DRY operation Vane angle is fixed to Angle 1. 2 In FAN operation 2 In HEAT operation Vane angle is fixed to Angle 4. (5) Dew prevention During COOL or DRY operation at Vane Angle 4 or 5 when the cumulative operation time of compressor exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention. (6) SWING MODE ( ) By selecting SWING mode with the VANE CONTROL button, the horizontal vane swings vertically. The remote controller displays " ". 14 (7) Cold air prevention in HEAT operation When any of the following conditions occurs in HEAT operation, the horizontal vane angle changes to Angle 1 automatically to prevent cold air blowing on users. x Compressor is not operating. Defrosting is performed. Indoor coil thermistor RT12 reads 24: or below. Indoor coil thermistor RT12 temperature is raising from 24°C or below, but it does not exceed 28:. Indoor coil thermistor RT12 temperature Released Cold air prevention 24: 28: Horizontal vane Set position Angle 1 NOTE : If the temperature of RT12 reads from 24°C to 28°C at the air conditioner stating , this control works. (8) ECONO COOL ( ) operation (ECONOmical operation) When the ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher than that in COOL mode. Also the horizontal vane swings in various cycle according to the temperature of indoor heat exchanger(RT12). SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher than that in COOL mode, the air conditioner can keep comfort. As a result, energy can be saved. ECONO COOL operation is cancelled when the ECONO COOL button is pressed once again or VANE CONTROL button is pressed or operation mode is changed. NOTE : ECONO COOL operation does not work in COOL mode of "I FEEL CONTROL". SWING operation In swing operation of ECONO COOL operation mode, the initial air flow direction is adjusted to "Horizontal". According to the temperature of indoor coil thermistor RT12 at starting of this operation, next downward blow time is decided. Then when the downward blow has been finished, next upward blow time is decided. For initial 10 min. the swing operation is performed in table G~H for quick cooling. Also, after 10 min. when the difference of set temperature and room temperature is more than 2 degrees, the swing operation is performed in table D~H for more cooling. The air conditioner repeats the swing operation in various cycle as follows. Temperature of indoor coil thermistor RT12 A B C D E F G H 15°C or less 15°C to 17°C 17°C to 18°C 18°C to 20°C 20°C to 21°C 21°C to 22°C 22°C to 24°C more than 24°C Downward blow time (sec.) 2 5 8 11 14 17 20 23 Horizontal blow time (sec.) 23 20 17 14 11 8 5 2 8-8. 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 TIME MONITOR, so set the current time correctly with CLOCK SET button. (3) Press ON or OFF TIMER buttons to select the operation. " " " button... AUTO START operation (ON timer) " button... AUTO STOP operation (OFF timer) 15 (4) Press HR. and MIN. 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. q A power failure occurs. q The circuit breaker functions. 2. Cancel TIMER setting can be cancelled with the ON or OFF TIMER buttons. (" To cancel the ON timer, press the " " button. To cancel the OFF timer, press the " " button. TIMER is cancelled and the display of set time disappears. " or " ") PROGRAM TIMER q The OFF timer and ON timer can be used in combination. q" " and " " display shows the order of the OFF timer and ON timer operation. (Example 1) The current time is 8:00 PM. (Example 2) The current time is 11:00 AM. The unit turns off at 11:00 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. 8-9. 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 [/ HEAT] MODE with a set temperature of 24°C. The fan speed shifts to Med. speed. The coil frost prevention works even in emergency operation [, and defrosting too]. In the test run or emergency operation, the horizontal vane operates in VANE AUTO ( ) mode. Emergency operation continues until the EMERGENCY OPERATION switch is pressed once again (MU-A07/A09/A12YV, MUX-A10/A19/A20/A22/A25/A26WV)/once or twice (MUH-A07/A09/A12YV, MXZ-A18/A26/A32WV) 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 does not depend on the shape of lamp. OPERATION INDICATOR lamp Press once Press again Press once again EMERGENCY OPERATION switch w Heat is available only in MUH-A07/A09/A12YV and MXZ-A18/A26/A32WV. 16 9 SERVICE FUNCTIONS MSC-A07YV - E1 MSC-A09YV - E1 MSC-A12YV - E1 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 25.) Set time : 1 minute 1-second Set time : 3 minutes 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 number of the indoor unit. How to modify the remote controller P.C. board Remove batteries before modification. The board has a print as shown below : Remote controller model : KP1A J2 J1 Remote controller model : KG3A J2 NOTE : 1. 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. 2. Remote controller model KP1A and KG3A are the same in terms of specification. J1 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 No. 1 unit No. 2 unit No. 3 unit No. 4 unit 1 unit operation No modification ­ ­ ­ 2 units operation Same as at left Solder J1 ­ ­ 3 units operation Same as at left Same as at left Solder J2 ­ 4 units operation Same as at left Same as at left Same as at left 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. 17 9-3. REMOTE CONTROLLER (How to set the type) This remote controller setting needs to be switched according to the type of air conditioner (COOL & HEAT or COOL ONLY). If the setting is incorrect, the air conditioner does not operate normally. Therefore, check if the setting corresponds to the type of air conditioner. If not, correct the setting as shown below. Slide switch Type COOL & HEAT COOL ONLY The position of the slide switch 9-4. MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER AND AUTO RESTART FUNCTION 1. MU & MUX TYPE / MUH & MXZ TYPE SWITCH OVER SW2-1 sets the AUTO RESTART FUNCTION ON / OFF. The indoor units for MU & MUX type and MUH & MXZ type SW2-2 switches over the MU & MUX type / MUH & MXZ type. are common specifications. Set switch according to the When the units are shipped from the factory, SW2 is as follows. type of outdoor unit. The units are set for SW2-1: AUTO RESTART FUNCTION ON MUH & MXZ type when they are shipped from the factory. SW2-2: MUH & MXZ type } How to switch over MU & MUX TYPE / MUH & MXZ TYPE ! Turn off the main power for the unit. @ Pull out the electronic control P.C. board, and change switch(SW2-2) on the indoor electronic control P.C. board according to the type of outdoor unit as following figures. 1 C1 F11 TAB12 L101 C N 1 21 CN201 CN202 CN112 FRONT CN121 CN151 Outdoor unit MU & MUX type Set 2 switch upside. Outdoor unit MUH & MXZ type Set 2 switch downside. IC101 SW1 12 12 SW2 SW2 connected on the terminal block, the unit does not operate normally. ·If a ground is incorrect, it may cause an electric shock. 2. AUTO RESTART FUNCTION When the indoor unit is controlled with the remote controller, the operation mode, set temperature, and the fan speed are memorized by the indoor electronic control P.C.board. The "AUTO RESTART FUNCTION" sets to work the moment power has restored after power failure.Then, the unit will restart automatically. However if the unit is operated in "I FEEL CONTROL" mode before power failure, the operation is not memorized. In "I FEEL CONTROL" mode, the operation is decided by the initial room temperature. "AUTO RESTART FUNCTION" is ON when the units are shipped from the factory. How to release "AUTO RESTART FUNCTION" ! Turn off the main power for the unit. @ Pull out the electronic control P.C. board, and change switch(SW2-1) on the indoor electronic control P.C. board as following figures. AUTO RESTART AUTO RESTART FUNCTION ON FUNCTION OFF Set 1 switch downside. Set 1 switch upside. 12 12 SW2 12 12 SW2 NOTE:·If the indoor-outdoor connecting wire is incorrectly 1 2 SW2 1 2 SW2 12 12 Operation ! If the main power (230V 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 3 minutes for the compressor to start running.) NOTE ·The operation settings are memorized when 10 seconds have passed after the remote controller was operated. ·If main power is cut 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 appliance not to turn on at the same time. ·When some air conditioners are connected to the same supply system, if they are operated before power failure, the starting current of all the compressors may flow simultaneously at restart. Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current by adding system that allows the units to start one by one. 18 10 TROUBLESHOOTING MSC-A07YV - E1 MSC-A09YV - E1 MSC-A12YV - E1 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, be sure to first turn off the remote controller to stop the unit, and then after confirming the horizontal vane is closed, turn off the breaker and/or disconnect the power plug. 2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board. 3) When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components. 4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires. Lead wiring Housing point 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) 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. 3) When troubleshooting, refer to the flow chart on page 20 and the check table on page 21. 4. How to replace batteries Weak batteries may cause the remote controller malfunction. In this case, replace the batteries to operate the remote controller normally. 2 Press the RESET button. 1 Remove the front lid and insert batteries. Then reattach the front lid. / HE /FA AT N /