SERVICE MANUAL MFZ-KA25VA - MFZ-KA35VA - MFZ-KA35VA - E1. Wireless type Models FLOOR-TYPE, HEAT PUMP AIR CONDITIONERS. No.

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1 FLOOR-TYPE, HEAT PUMP AIR CONDITIONERS SERVICE MANUAL Wireless type Models MFZ-KAVA - MFZ-KA3VA - E E. OB409 MFZ-KA0VA - E Indication of model name MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - E NOTE: This service manual describes technical data of the indoor units. As for outdoor units SUZ-KAVA.TH, SUZ-KA3VA.TH, SUZ- KAVAH.TH, SUZ-KA3VAH.TH and SUZ-KA0VA.TH refer to service manual OC3. As for outdoor units MXZ-3A4VA- E, MXZ-4A7VA- E and MXZ-4A80VA- E, refer to service manual OB377. As for outdoor unit MXZ-8A40VA, refer to service manual OC36. CONTENTS. PART NAMES AND FUNCTIONS. SPECIFICATION 4 3. NOISE CRITERIA CURVES 6 4. OUTLINES AND DIMENSIONS 7. WIRING DIAGRAM 8 6. REFRIGERANT SYSTEM DIAGRAM 8 7. PERFORMANCE CURVES 9 8. SERVICE FUNCTIONS 9 9. TROUBLESHOOTING 0. DISASSEMBLY INSTRUCTIONS 3. PARTS LIST 39. OPTIONAL PARTS 43

2 PART NAMES AND FUNCTIONS INDOOR UNIT MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - E Vertical vane Air outlet Front grille Fan guard Horizontal vane Panel Catechin air filter Air cleaning filter (Anti-Allergy Enzyme Filter, blue bellows type) Remote controller Damper Air outlet Vertical vane Air inlet Display and operation section (When the front grille is opened) Operation indicator lamp Emergency operation switch Air outlet selection switch Remote control receiving section ACCESSORIES Drain hose Remote controller holder Fixing screw for 3. o.6 mm (Black) Pipe cover Band Battery (AAA) for remote controller Indoor unit mounting bracket Fixing screw for 7 4 o mm Wood screw for the indoor unit fixation Washer of 9 Felt tape (Used for left or left-rear piping) Wireless remote controller Air cleaning filter MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - E 4 4

3 MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - E REMOTE CONTROLLER Signal transmitting section Operation display section OPERATE/STOP (ON/OFF) button Temperature buttons Open the front lid. Indication of remote controller model is on back (This diagram shows an overall view.) FAN SPEED CONTROL button OPERATION SELECT button ECONO COOL button i save button OFF-TIMER button ON-TIMER button TIME SET buttons FORWARD button BACKWARD button RESET button CLOCK SET button VANE CONTROL button 3

4 SPECIFICATION Indoor model MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - E Capacity Electrical data Fan motor Special remarks Function Power supply Air flow(super High) Air flow(highw/med.w/loww) Power outlet Running current Power input Auxiliary heater Power factor Fan motor current Model (Upper) Model (Lower) Dimensions WOHOD Weight Air direction Sound level(super High) Sound level(highw/med.w/loww) Fan speed(super High) Upper Fan speed(highw/med.w/loww) Fan speed(super High) Fan speed(highw/med.w/loww) Fan speed regulator Thermistor RT(at :) Thermistor RT(at :) Thermistor RT3(at :) Thermistor RT4(at :) Thermistor RT(at :) Remote controller model Lower K /h K /h A A W A(kW) % A mm kg db(a) db(a) rpm rpm rpm rpm k" k" k" k" k" Cooling Heating Cooling Heating Cooling Single phase Single phase 30V,0Hz 30V,0Hz W/ 348W/ 88W 46W/ 37W/ 300W 444W/ 366W/ 300W 468W/ 37W/ 3W W/ 474W/ 46W RC0J30-GA RC0J30-HA 700O600O W/ 7W/ W 33W/ 8W/ 3W 38W/ 8W/ W 39W/ 3W/ 3W,080,00,30,030,80,60 940W/ 800W/ 700W 870W/ 740W/ 630W 970W/ 830W/ 70W 890W/ 740W/ 60W,40W/,00W/ 940W,070W/ 930W/ 80W 880,00 930,030,080,60 740W/ 60W/ 0W 870W/ 740W/ 630W 770W/ 680W/ 70W 890W/ 740W/ 60W 940W/ 80W/ 740W,070W/ 930W/ 80W KM0G NOTE : Test conditions are based on ISO Cooling : Indoor Dry-bulb temperature 7:Wet-bulb temperature 9: Outdoor Dry-bulb temperature 3:Wet-bulb temperature 4: Heating : Indoor Dry-bulb temperature 0:Wet-bulb temperature : Outdoor Dry-bulb temperature 7:Wet-bulb temperature 6: Refrigerant piping length (one way): m w Reference value Measured under rated operating frequency RC0J30-GA RC0J30-HA 700O600O KM0G Single phase 30V,0Hz RC0J30-GA RC0J30-HA 700O600O KM0G Heating W/ 8W/ 444W 4

5 Capacity Electrical data Compressor Fan motor Special remarks Outdoor model Function Power supply Capacity Rated frequency(min.~max.) Dehumidification Air flow(high/loww) Starting current Compressor motor current Fan motor current Model Output Winding resistance(at 0:) Model Winding resistance(at 0:) Dimensions WOHOD Weight Sound level Fan speed(highw/loww, Highw/Medw/Loww) Fan speed regulator Refrigerant filling capacity(r40a) Refrigerating oil (Model) Thermistor RT6 (at 0:) Thermistor RT6 (at 00:) Thermistor RT64 (at 0:) Thermistor RT6 (at :) Thermistor RT6 (at :) Thermistor RT6 (at 00:) Thermistor RT64 (at 0:) Thermistor RT6 (at :) Thermistor RT68 (at :) kw r/h K /h A A A Coefficient of performance (C.O.P) Specifications and rating conditions of main electric parts W " " mm kg db rpm kg cc k" k" k" k" k" k" k" k" k" SUZ-KAVA(H).TH SUZ-KA3VA(H).TH SUZ-KA0VA.TH Indoor model Indoor model Indoor model MFZ-KAVA- E MFZ-KA3VA- E MFZ-KA0VA- E Cooling Heating Cooling Heating Cooling Heating Single phase 30V,0Hz Single phase 30V,0Hz Single phase 30V,0Hz. ( ) 3.4 (0.9 -.) 3. ( ) 4.0 (0.9-6.) 4.8 ( ) 6.0( )..7.,890 /,746,08 /,06,896 /,668,96 /,36,940 /.60w,940 /,0w KNB073FDVH 0 KNB09FCAH 60 SNB30FLDH 80 U-V.3 U-W.3 U-V 0.49 U-W 0.49 U-V 0.4 U-W 0.4 V-W.3 RC0J0-AL WHT-BLK 37. BLK-RED 37. RED-WHT o0o8 33 V-W 0.49 RC0J0-AL WHT-BLK 37. BLK-RED 37. RED-WHT o0o8 37 V-W 0.4 PM8H60-UB WHT-BLK. BLK-RED. RED-WHT. 840o80o w/70w 880w/80w/60w 840w/760w 880w/800w/630w 800/480w 800/60w (NEO) NOTE : Test conditions are based on ISO Cooling : Indoor Dry-bulb temperature 7:Wet-bulb temperature 9: Outdoor Dry-bulb temperature 3:Wet-bulb temperature 4: Heating : Indoor Dry-bulb temperature 0:Wet-bulb temperature : Outdoor Dry-bulb temperature 7:Wet-bulb temperature 6: Refrigerant piping length (one way): m w Reference value Measured under rated operating frequency (NEO) (NEO) Item Fuse Damper lock motor Right Damper lock motor Left Horizontal vane motor Damper motor Varistor Model (F) (ML) (ML) (MV) (MV) (NR) MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - E T3.AL 0V V 300" V 300" V 300" V 300" ERZV4D47

6 3 NOISE CRITERIA CURVES MFZ-KAVA - E Test conditions, Cooling : Dry-bulb temperature 7: Wet-bulb temperature 9: Heating : Dry-bulb temperature 0: Wet-bulb temperature : 90 OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE FAN SPEED Super High FUNCTION COOLING HEATING SPL(dB(A)) BAND CENTER FREQUENCIES, Hz LINE NC-70 NC-60 NC-0 NC-40 NC-30 NC-0 Test conditions, Cooling : Dry-bulb temperature 7: Wet-bulb temperature 9: Heating : Dry-bulb temperature 0: Wet-bulb temperature : 90 OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR MFZ-KA3VA - E APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE FAN SPEED Super High FUNCTION COOLING HEATING SPL(dB(A)) BAND CENTER FREQUENCIES, Hz LINE NC-70 NC-60 NC-0 NC-40 NC-30 NC-0 MFZ-KA0VA - E FAN SPEED FUNCTION SPL(dB(A)) LINE Super High COOLING HEATING Test conditions, Cooling : Dry-bulb temperature 7: Wet-bulb temperature 9: Heating : Dry-bulb temperature 0: Wet-bulb temperature : 90 OCTAVE BAND SOUND PRESSURE LEVEL, db re MICRO BAR APPROXIMATE THRESHOLD OF HEARING FOR CONTINUOUS NOISE BAND CENTER FREQUENCIES, Hz NC-70 NC-60 NC-0 NC-40 NC-30 NC-0 INDOOR UNIT MICROPHONE WALL m m 6

7 4 OUTLINES AND DIMENSIONS MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - E INDOOR UNIT Unit : mm 4-[6 Hole Installation plate Indoor unit More than 00mm Air out 00 More than 00mm More than 00mm 600 Air out Air in 8 96 Gas pipe, 3:[9.(flared)3/8 0:[.7(flared)/ Liquid pipe [6.3(flared)/ drain

8 WIRING DIAGRAM MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - E INDOOR UNIT TO OUTDOOR UNIT CONNECTING GRN 30V~ -4V LD04 CN RT TB S S RT RT3 RT4 RT LS S3 LS CN TBR 30V~ S TO OUTDOOR UNIT CONNECTING -4V S S3 MODELS WIRING DIAGRAM BLK BLU RED CN TAB306 3 CN CN CN X CN Y BLK WHT CN CN0 F NR LD 0(A) WHT 6 RED DISP REC P.C.BOARD 3 CN0 6 CN MV ML F NR CN DB DB 3 CN0 MV ML INDOOR ELECTRONIC CONTROL P.C. BOARD LD03 CN T LD 0(T) T MF CN 3 4 MF CN CN CN CN INDOOR ELECTRONIC CONTROL P.C. BOARD RED BLK WHT YLW BLU RT3 RT RT MF MV INTERLOCK SWITCH(FAN) POWER MONITOR RECEIVER P.C.BOARD GRNSW P.C. BOARD SYMBOL DB F LS LS MF MF ML 6 NAME DIODE STACK FUSE (T3.AL0V) DAMPER LIMIT SWITCH (OPEN) DAMPER LIMIT SWITCH (CLOSE) UPPER INDOOR FAN MOTOR LOWER INDOOR FAN MOTOR DAMPER LOCK MOTOR (RIGHT) SYMBOL ML MV MV NR RT RT RT3 NAME DAMPER LOCK MOTOR (LEFT) HORIZONTAL VANE MOTOR DAMPER MOTOR VARISTOR ROOM TEMPERATURE THERMISTOR INDOOR COIL THERMISTOR (MAIN ) INDOOR COIL THERMISTOR (SUB) NOTE:. About the outdoor side electric wiring refer to the outdoor unit electric wiring diagram for servicing.. Use copper conductors only. (For field wiring) 3. Symbols below indicate. /: Terminal block, : Connector REFRIGERANT SYSTEM DIAGRAM SYMBOL RT4 TR T NAME INDOOR COIL THERMISTOR (MAIN ) INDOOR COIL THERMISTOR (MAIN 3) TRANSFORMER MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - E INDOOR UNIT Refrigerant pipe [9. (MFZ-KA/3VA) Refrigerant pipe [.7 (MFZ-KA0VA) (with heat insulator) Unit : mm Indoor heat exchanger Indoor coil thermistor RT (main) Distributor Flared connection Indoor coil thermistor RT, RT4, RT (main) RT3 (sub) Room temperature thermistor RT Flared connection Refrigerant flow in cooling Refrigerant flow in heating 8 Refrigerant pipe [6.3 (with heat insulator)

9 7 PERFORMANCE CURVES MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - E The standard data contained in these specifications apply only to the operation of the air conditioner under normal condition. Operating conditions vary according to the areas where these units are installed. The following information has been provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve. () GUARANTEED VOLTAGE () AIR FLOW Air flow should be set at MAX. (3) MAIN READINGS COOLING () Indoor intake air wet-bulb temperature : W.B. C () Indoor outlet air wet-bulb temperature : W.B. C (3) Outdoor intake air dry-bulb temperature : D.B. C (4) Total input : W HEATING () Indoor intake air dry-bulb temperature : D.B. C () Indoor outlet air dry-bulb temperature : D.B. C (3) Outdoor intake air wet-bulb temperature : W.B. C (4) Total input : W Indoor air wet/dry-bulb temperature difference on the side of the following chart shows the difference between the indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service. How to measure the indoor air wet-bulb/dry-bulb temperature difference. Attach at least sets of wet-and-dry-bulb thermometers to the indoor air inlet as shown in the figure, and at least sets of wet-and-dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed is high.. Attach at least sets of wet-and-dry-bulb thermometers to the outdoor air inlet. Cover the thermometers to prevent direct rays of the sun. 3. Check that the air filter is cleaned. 4. Open windows and doors of the room.. Press the EMERGENCY OPERATION switch once to start the COOL(HEAT) MODE. 6. When system stabilizes after more than minutes, measure temperature and take an average temperature minutes later, measure temperature again and check that the temperature does not change. INDOOR UNIT Wet and dry-bulb thermometers OUTDOOR UNIT FRONT VIEW Wet-and dry-bulb thermometers BACK VIEW Indoor air Wet-bulb temperature difference (degree) Indoor intake air Wet-bulb temperature (:) Indoor intake air Wet-bulb temperature (:) MFZ-KAVA - E SUZ-KAVA(H).TH Rated frequency 7Hz MFZ-KA3VA - E SUZ-KA3VA(H).TH Rated frequency 77Hz MFZ-KA0VA - E SUZ-KA0VA.TH Rated frequency 7Hz Outdoor intake air Dry-bulb temperature (:) Outdoor intake air Dry-bulb temperature (:) 9

10 Indoor air Dry-bulb temperature difference (degree) Indoor intake air Dry-bulb temperature (:) Indoor intake air Dry-bulb temperature (:) MFZ-KAVA - E SUZ-KAVA(H).TH Rated frequency 80Hz MFZ-KA3VA - E SUZ-KA3VA(H).TH Rated frequency 74Hz MFZ-KA0VA - E SUZ-KA0VA.TH Rated frequency 79Hz Outdoor intake air Wet-bulb temperature (:) Outdoor intake air Wet-bulb temperature (:) NOTE:The above curves are for the heating operation without any frost. SUZ-KAVA(H).TH Correction of Cooling capacity. SUZ-KAVA(H).TH SUZ-KAVA(H).TH SUZ-KAVA(H).TH Correction of Cooling total input Correction of Heating capacity Correction of Heating total input.0.0. Capacity correction factors (Hz) The operational frequency of compressor Input correction factors (Hz) The operational frequency of compressor Capacity correction factors (Hz) The operational frequency of compressor Input correction factors (Hz) The operational frequency of compressor SUZ-KA3VA(H).TH SUZ-KA3VA(H).TH SUZ-KA3VA(H).TH SUZ-KA3VA(H).TH Correction of Cooling capacity. Correction of Cooling total input Correction of Heating capacity Correction of Heating total input.0.0. Capacity correction factors (Hz) The operational frequency of compressor Input correction factors (Hz) The operational frequency of compressor Capacity correction factors (Hz) The operational frequency of compressor Input correction factors (Hz) The operational frequency of compressor Capacity correction factors Correction of Cooling capacity SUZ-KA0VA.TH SUZ-KA0VA.TH SUZ-KA0VA.TH SUZ-KA0VA.TH (Hz) The operational frequency of compressor Input correction factors Correction of Cooling total input (Hz) The operational frequency of compressor OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT Capacity correction factors 0 Correction of Heating capacity (Hz) The operational frequency of compressor Input correction factors Correction of Heating total input (Hz) The operational frequency of compressor <How to operate fixed-frequency operation (Test run operation)>. Press the EMERGENCY OPERATION switch or the Test button to COOL or HEAT mode.. Test run operation starts and continue to operate for 30 minutes. 3. Compressor starts at rated frequency in COOL mode or 8Hz in HEAT mode. 4. Indoor fan operates at High speed.. After 30 minutes, test run operation finishes and EMERGENCY OPERATION starts. 6. To cancel test run operation (EMERGENCY OPERATION), press the EMERGENCY OPERATION switch or the ON/OFF button on remote controller. NOTE : The unit of pressure has been changed to MPa on the international system of units (SI unit system). The conversion factor is: (MPa [Gauge]) =0.(kgf/f [Gauge])

11 OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENT COOLING operation Both indoor and outdoor unit are under the same temperature/humidity condition. Air flow : High speed 3 Operational frequency : 7Hz (SUZ-KAVA(H).TH) 77Hz (SUZ-KA3VA(H).TH) 7Hz (SUZ-KA0VA.TH) Dry-bulb temperature Relative humidity(%) SUZ-KAVA(H).TH (kgf/f [Gauge]) (MPa [Gauge]) 4.4 SUZ-KA3VA(H).TH (kgf/f [Gauge]) (MPa [Gauge]) 4.4 SUZ-KA0VA(H).TH (kgf/f [Gauge]) (MPa [Gauge]) 4.4 Outdoor low pressure Hz Outdoor low pressure Hz Outdoor low pressure Hz ( C) (%) Ambient temperature( C) Ambient humidity(%) ( C) (%) Ambient temperature( C) Ambient humidity(%) ( C) (%) Ambient temperature( C) Ambient humidity(%) Outdoor unit current(a) SUZ-KAVA(H).TH 3. 7Hz Outdoor unit current(a) SUZ-KA3VA(H).TH 77Hz Outdoor unit current(a) SUZ-KA0VA.TH 7Hz ( C) (%) Ambient temperature( C) Ambient humidity(%) ( C) (%) Ambient temperature( C) Ambient humidity(%) ( C) (%) Ambient temperature( C) Ambient humidity(%) HEATING operation Condition indoor: Dry bulb temperature 0.0 C Wet bulb temperature 4. C Condition outdoor: Dry bulb temperature,7,,0.0 C Wet bulb temperature,6,,4. C 3.0 SUZ-KAVA(H).TH 4. SUZ-KA3VA(H).TH 6.0 SUZ-KA0VA.TH Outdoor unit current (A)..0 8Hz Outdoor unit current (A) Hz Outdoor unit current (A)..0 8Hz. 0 0 (:) Ambient temperature( C) (:) Ambient temperature( C) (:) Ambient temperature( C)

12 PERFORMANCE DATA COOLING operation Rated frequency 7Hz MFZ-KAVA - E / SUZ-KAVA.TH, SUZ-KAVAH.TH CAPACITY :.(kw) SHF : 0.66 INPUT : 80(W) OUTDOOR DB(:) INDOOR INDOOR 7 30 DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature

13 PERFORMANCE DATA COOLING operation Rated frequency 7Hz MFZ-KAVA - E / SUZ-KAVA.TH, SUZ-KAVAH.TH CAPACITY :.(kw) SHF : 0.66 INPUT : 80(W) OUTDOOR DB(:) INDOOR INDOOR DB (:) WB (:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature 3

14 PERFORMANCE DATA COOLING operation Rated frequency 77Hz MFZ-KA3VA - E / SUZ-KA3VA.TH, SUZ-KA3VAH.TH CAPACITY : 3.(kW) SHF : 0.6 INPUT : 090(W) OUTDOOR DB(:) INDOOR INDOOR 7 30 DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature 4

15 PERFORMANCE DATA COOLING operation Rated frequency 77Hz MFZ-KA3VA - E / SUZ-KA3VA.TH, SUZ-KA3VAH.TH CAPACITY : 3.(kW) SHF : 0.6 INPUT : 090(W) OUTDOOR DB(:) INDOOR INDOOR DB (:) WB (:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature

16 PERFORMANCE DATA COOLING operation Rated frequency 7Hz MFZ-KA0VA - E / SUZ-KA0VA.TH, SUZ-KA0VAH.TH CAPACITY : 4.8(kW) SHF : 0.63 INPUT : 0(W) OUTDOOR DB(:) INDOOR INDOOR 7 30 DB(:) WB(:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature 6

17 PERFORMANCE DATA COOLING operation Rated frequency 7Hz MFZ-KA0VA - E / SUZ-KA0VA.TH, SUZ-KA0VAH.TH CAPACITY : 4.8(kW) SHF : 0.63 INPUT : 0(W) OUTDOOR DB(:) INDOOR INDOOR DB (:) WB (:) Q SHC SHF INPUT Q SHC SHF INPUT Q SHC SHF INPUT NOTE Q : Total capacity (kw) SHF : Sensible heat factor DB : Dry-bulb temperature SHC : Sensible heat capacity (kw) INPUT : Total power input (W) WB : Wet-bulb temperature 7

18 PERFORMANCE DATA HEATING operation MFZ-KAVA- E / SUZ-KAVA(H).TH CAPACITY : 3.4(kW) INPUT : 83(W) INDOOR -0 DB(:) Q INPUT Q INPUT Q Rated frequency 80Hz 0 INPUT OUTDOOR Q WB(:) INPUT Q INPUT Q INPUT Q INPUT MFZ-KA3VA- E / SUZ-KA3VA(H).TH CAPACITY : 4.0(kW) INPUT : 00(W) Rated frequency 74Hz OUTDOOR WB(:) INDOOR DB(:) Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT Q INPUT MFZ-KA0VA- E / SUZ-KA0VA.TH CAPACITY : 6.0(kW) INPUT : 860(W) INDOOR -0 DB(:) Q INPUT Q INPUT Q Rated frequency 79Hz 0 INPUT OUTDOOR Q INPUT WB(:) Q INPUT Q INPUT Q INPUT NOTE Q:Total capacity (kw) INPUT:Total power input (W) DB : Dry-bulb temperature WB : Wet-bulb temperature 8

19 8 SERVICE FUNCTIONS MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - E 8-. TIMER SHORT MODE For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board. The time will be shortened as follows. (Refer to 9-7.) Set time : -minute -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.) 8-. 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, both the P.C. boards of remote controller and the electronic control P.C. boards 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 : KM0G NOTE : For remodelling, take out the batteries and push the OPERATE/STOP(ON/OFF) button twice or 3 times at first. After finish remodelling, put back the batteries then press the RESET button. J J The P.C. board has the print J and J. Solder J and J according to the number of indoor unit as shown in Table. After modification, press the RESET button. Table. unit. unit. 3 unit. 4 unit unit operation modification units operation Same as at left Solder J 3 units operation Same as at left Same as at left Solder J 4 units operation Same as at left Same as at left Same as at left Solder both J and J Table How to modify the electronic control P.C. board Turn OFF the power supply before modification. Cut off JR0 and JR06 on the electronic control P.C. board according to the number of indoor unit as shown in Table. (Refer to 9-7.) Indoor electronic control P.C.Board. unit. unit. 3 unit. 4 unit JR0 modification Cut off JR0 modification Cut off JR0 JR06 modification modification Cut off JR06 Cut off JR06 Fuse (F) VARISTOR (NR) R JR0 JR06 IC0 CNX CNY CT CN CN CN CN NOTE : After modification, turn ON the power supply and with the remote controller headed towards the indoor unit, press the OPERATE/STOP(ON/OFF) button. If one or two beeps is heard from the indoor unit, modification is completed correctly. 9

20 8-3. 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. The AUTO RESTART FUNCTION sets to work the moment power has restored after power failure. Then, the unit will restart automatically. Operation If the main power 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.) How to release AUTO RESTART FUNCTION Turn off the main power for the unit. Solder the Jumper wire to JR07 on the indoor electronic control P.C. board. (Refer to 9-7.) F CN CN CN3 CN06 JR07 IC0 CN CN C T CN CN CN NOTE: The operation settings are memorized when 0 seconds have passed after the indoor unit was operated with the remote controller. If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is cancelled. If the unit has been off with the remote controller before power failure, the auto restart function does not work as the power button of the remote controller is off. To prevent breaker tripping 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 to the system that allows the units to start one by one. 0

21 9 TROUBLESHOOTING MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - E 9-. Cautions on troubleshooting. Before troubleshooting, check the following: ) Check the power supply voltage. ) Check the indoor/outdoor connecting wire for mis-wiring.. Take care the following during servicing. ) Before servicing the air conditioner, be sure to turn off the unit first with the remote controller, and then after confirming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug. ) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the electronic control P.C. board. 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 ) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is flashing on and off before starting service work. ) Before servicing check that the connector and terminal are connected properly. 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 9-., 9-3. and How to replace batteries Weak batteries may cause the remote controller malfunction. In this case, replace the batteries to operate the remote controller normally. Remove the front lid and insert batteries. Then reattach the front lid. Press RESET button with tip end of ball point pen or the like, and then use the remote controller. Insert the negative pole of the batteries first. Check if the polarity of the batteries are correct. RESET button NOTE :. If RESET button is not pressed, the remote controller may not operate correctly.. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced. This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the battery replacement. INFORMATION FOR MULTI SYSTEM AIR CONDITIONER OUTDOOR UNIT : MXZ series Multi system air conditioner can connect two or more indoor units with one outdoor unit. Unit won t operate in case the total capacity of indoor units exceeds the capacity of outdoor units. Do not connect indoor units beyond the outdoor unit capacity. Operation indicator lamp flashes as shown in the figure below. When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and the other for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor units will start the operation later cannot operate, indicating as shown in the figure below. In this case, please set all the indoor units to the same operation mode. OPERATION INDICATOR Lighted (Green) Blinking (Green or Orange) t lighted Blinking green : Standby for normal operation Blinking orange : Standby for i-save operation When indoor units start operation while the defrosting of outdoor unit is being done, it takes a few minutes (max. 0 minutes) to blow out the warm air. In heating operation, even though the indoor unit is not in operation, the room may get warm or the sound of refrigerant flowing may be heard. This is not a malfunction. The refrigerant continuously into it causes this.

22 9-. Failure mode recall function Outline of the function This air conditioner can memorize the abnormal condition which has occurred once. Even though OPERATION INDICATOR lamp indication listed on the troubleshooting check table (9-4.) disappears, the memorized failure details can be recalled. This mode is very useful when the unit needs to be repaired for the abnormality which doesn't recur.. Flow chart of failure mode recall function for the indoor/outdoor unit Operational procedure The cause of abnormality cannot be found because the abnormality doesn't recur. Setting up the failure mode recall function Turn ON the power supply. While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds. Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. W While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds. W. Regardless of normal or abnormal, a short beep is emitted once as the signal is received. Does the left lamp of OPERATION INDICATOR lamp on the indoor unit blink at the interval of 0. seconds? Blinks: Either indoor or outdoor unit is abnormal. Beep are emitted at the same timing as the blinking of the left lamp of OPERATION INDICATOR lamp. W Judgment of indoor/outdoor abnormality (Blinks) Before blinking, does the left lamp of OPERATION INDICATOR lamp stay ON for 3 seconds? Stays ON for 3 seconds (without beep): The outdoor unit is abnormal. The indoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the indoor unit failure mode table (9-..). Make sure to check at least two consecutive blinking cycles. W (OFF) Indoor unit is normal. But the outdoor unit might be abnormal because there are some abnormalities that are not memorized in the indoor unit. Confirm if outdoor unit is abnormal according to the flow chart of the detailed outdoor unit failure mode recall function. The outdoor unit is abnormal. Check the blinking pattern, and confirm the abnormal point with the outdoor unit failure mode table (Refer to outdoor unit service manual). Make sure to check at least two consecutive blinking cycles. W 3 Releasing the failure mode recall function Release the failure mode recall function by the following procedures. (AorBC) AWith the remote controller headed towards the indoor unit, press any button that is not used in this failure mode recall function (e.g. TIMER button). BTurn OFF the power supply and turn ON it again. CPress RESET button of the remote controller. As for outdoor units, refer to service manual OC3, OB377 or OC36. Repair the defective parts. Deleting the abnormal memorized condition After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall function" mentioned above. Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. W 3Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted. 4Release the failure mode recall function according to "Releasing the failure mode recall function" mentioned above. te.make sure to release the failure mode recall function once it's set up, otherwise the unit cannot operate properly..if the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized. W. Blinking pattern when the indoor unit is abnormal:.-second OFF Blinking at 0.- second interval.-second OFF Blinking at 0.- second interval ON OFF Beeps Repeated cycle Beeps Repeated cycle Beeps Repeated cycle W 3.Blinking pattern when the outdoor unit is abnormal: Blinking at 0.-.-second OFF 3-second ON second interval.-second OFF 3-second ON Blinking at 0.- second interval ON OFF beep Repeated cycle Beeps beep Repeated cycle Beeps Repeated cycle

23 . Indoor unit failure mode table NOTE:Blinking patterns of this mode differs from the ones of Troubleshooting check table(9-4.). Left lamp of Right lamp of OPERATION OPERATION INDICATOR lamp INDICATOR lamp Abnormal point (Failure mode) Check point Countermeasure t lighted t lighted rmal -time flash every 0.-second t lighted Room temperature thermistor When the room temperature thermistor short or open circuit is detected every 8 seconds during operation. Refer to the characteristics of the room temperature thermistor (9-7.). -time flash.-second OFF t lighted Indoor coil thermistor (Main, and sub) When the indoor coil thermistor short or open circuit is detected every 8 seconds during operation. Refer to the characteristic of the main, indoor coil thermistor and the sub indoor coil thermistor (9-7.). 3-time flash.-second OFF t lighted Serial signal error When the serial signal from the outdoor unit is not received for a maximum of 6 minutes. Refer to 9-6.D "How to check miswiring and serial signal error". -time flash.-second OFF t lighted -time flash every 0.-second Indoor fan motor (Upper) Indoor fan motor (Lower) When the rotational frequency feedback signal is not emitted during -second the indoor fan operation. Refer to 9-6 A- "Check of indoor fan motor (Upper)" Refer to 9-6 A- "Check of indoor fan motor (Lower)" -time flash.-second OFF 3-time flash.-second OFF 4-time flash.-second OFF t lighted t lighted t lighted Indoor control system Indoor coil thermistor (Main 3) Damper When it cannot be read properly data in the nonvolatile memory of the indoor electronic control P.C. board. When the indoor coil thermistor short or open circuit is detected every 8 seconds during operation. When the damper is not located at the designated position. Replace the indoor electronic control P.C. board. Replace to the characteristic of the main 3 indoor coil thermistor (9.7.). Refer to 9-6.E "Check of damper". 3

24 9-3. Instruction of troubleshooting Start Indoor unit operates. Outdoor unit doesn't operate. Indoor unit operates. Outdoor unit doesn't operate normally. Indoor unit doesn't receive the signal from remote controller. OPERATION INDICATOR lamp on the indoor unit is flashing on and off. Outdoor unit operates in only Test Run operation. w Outdoor unit doesn't operate even in Test Run operation. w Unit doesn't operate normal operation in COOL or HEAT mode. Indoor unit operates, when EMERGENCY OPERATION switch is pressed. Indoor unit doesn't operate, when EMERGENCY OPERATION switch is pressed. If blinking of OPERATION INDICATOR lamp cannot be checked, it can be checked with failure mode recall function. w "Test Run operation" means the operation within 30 minutes after EMERGENCY OPERATION switch is pressed. Check room temperature thermistor. Refer to 9-7. "Test point diagram and voltage". Refer to "How to check inverter/ compressor". Refer to "Check of R.V. coil". Refer to 9-6.B "Check of remote controller and receiver P.C. board".. Check indoor / outdoor connecting wire. (Check if the power is supplied to the indoor unit.). Refer to 9-6.C "Check of indoor electronic control P.C. board and indoor fan motor". As for outdoor units, refer to service manual OC3, OB377 or OC36. Left lamp Flash on and off at 0.-second intervals Cause: Indoor/ Outdoor unit Mis-wiring or trouble of serial signal Left lamp -time flash Cause: Indoor unit Trouble of room temperature/ indoor coil thermistor Left lamp 3-time flash Cause: Indoor unit Trouble of indoor fan motor Left lamp 4-time flash Cause: Indoor unit Trouble of indoor unit control system Left lamp -time flash Cause: Outdoor unit Outdoor power system abnormality Left lamp 6-time flash Cause: Outdoor unit Trouble of thermistor in outdoor unit Left lamp 7-time flash Cause: Outdoor unit Trouble of outdoor control system Left lamp 4-time flash Cause: Outdoor unit Other abnormality Left lamp -time flash Cause: Indoor unit Trouble of damper Refer to 9-6. D "How to check the mis-wiring and serial signal error (when outdoor unit doesn't work)". Check room temperature thermistor and indoor coil thermistor. Refer to 9-7. "Test point diagram and voltage". Refer to 9-6. A-, A- "Check of indoor fan motor". Replace the indoor electronic control P.C. board. Refer to "How to check the inverter/ compressor". Refer to "Check of outdoor thermistors". Replace the inverter P.C. board or the outdoor electronic control P.C. board. Check "Flow chart of the detailed outdoor unit failure mode recall function." Refer to 9-6. E "Check of damper". 4

25 9-4. Troubleshooting check table OPERATION INDICATOR t lighted NOTE : Before taking measures, make sure that the symptom reappears for accurate troubleshooting. Self check table Lighted Blinking Flashing of OPERATION INDICATOR lamp (left-hand side lamp) indicates abnormalities.. Abnormal point Mis-Wiring or serial signal Left lamp flashes. 0.-second ON 0.-second OFF Operation indicator lamp Symptom Check point Contermeasure Indoor unit and outdoor unit do not operate. When the serial signal from the outdoor unit is not received for a maximum of 6 minutes. Refer to 9-6.D "How to check mis-wiring and serial signal error". Outdoor control system Left lamp lights up Outdoor unit does not operate. When it cannot properly read data in the nonvolatile memory of the inverter P.C. board or of the outdoor electronic control P.C. board. Check the blinking pattern of the LED on the inverter P.C. board or the outdoor electronic control P.C. board. 3 Indoor coil thermistor Room temperature thermistor Left lamp flashes. -time flash.-second OFF Indoor unit and outdoor unit do not operate. When the indoor coil or the room temperature thermistor is shorts or opens circuit. Refer to 9-7.the characteristics of indoor coil thermistor, and the room temperature thermistor. 4 Indoor fan motor Left lamp flashes. 3-time flash.-second OFF Indoor unit and outdoor unit do not operate. When the rotational frequency feedback signal is not emitted during the indoor fan operation. Refer to 9-6.A-, A- "Check of indoor fan motor" Indoor control system Outdoor power system.-second OFF Left lamp flashes. 6-time flash Outdoor thermistors Outdoor control system Other abnormality Indoor damper Left lamp flashes. 4-time flash Left lamp flashes. -time flash Left lamp flashes. 7-time flash Left lamp flashes. 4-time flash.-second OFF.-second OFF Left lamp flashes. -time flash.-second OFF.-second OFF.-second OFF Indoor unit and outdoor unit do not operate. Indoor unit and outdoor unit do not operate. Indoor unit and outdoor unit do not operate. Indoor unit and outdoor unit do not operate. Indoor unit and outdoor unit do not operate. Indoor unit and outdoor unit do not operate. When it cannot properly read data in the nonvolatile memory of the indoor electronic control P.C. board. The compressor stops 3 times consecutively for over current protection or start-up failure protection within minute after start-up. When the outdoor thermistors short or open circuit during the compressor operation. When it cannot properly read data in the nonvolatile memory of the inverter P.C. board or of the outdoor electronic control P.C. board. An abnormality other than above mentioned is detected. When the damper is not located at the designated position. Replace the indoor electronic control P.C. board. Refer to "Check of inverter/ compressor". Refer to service manual OC3, OB377 or OC36. Check the stop valve. Refer to "Check of outdoor thermistor". Refer to service manual OC3, OB377 or OC36. Replace the inverter P.C. board or the outdoor electronic control P.C. board. Refer to service manual OC3, OB377 or OC36. Confirm the abnormality in detail using the failure mode recall function. Refer to service manual OC3, OB377 or OC36. Refer to 9-6.E "Check of damper". NOTE : When the indoor unit has started operation and the above failures are detected (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR lamp flashing.

26 OPERATION INDICATOR Lighted Blinking t lighted Flashing of OPERATION INDICATOR lamp (right-hand side lamp) indicates abnormality. OPERATION INDICATOR lamp (left-hand side lamp) is lighted.. Abnormal point MXZ type Operation mode setting.-second OFF Operation indicator lamp Symptom Check point Countermeasure Right lamp flash Outdoor unit operates but indoor unit does not operate. When the operation mode of the each indoor unit is differently set to COOL(includes DRY) and HEAT at the same time, the operation mode of the indoor unit that has operated at first has the priority. Unify the operation mode. Refer to service manual OB377. NOTE : When the indoor unit has started operation and the above failures are detected (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR lamp flashing. 9-. Trouble judgement criteria of main parts MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - E Part name Room temperature thermistor (RT) Indoor coil thermistor (RT(MAIN), RT3(SUB)) Check method and criteria Measure the resistance with a tester. (Part temperature 0 C ~ 30 C) rmal 8 k" ~ 0 k" Abnormal Open or short-circuit Figure Indoor fan motor (Upper) (MF) Check 9-6. A-. Indoor fan motor (Lower) (MF) Check 9-6. A-. Damper lock motor Right (ML) Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 30 C) Color of the lead wire BRN-other one rmal 3" ~ " Abnormal Open or short-circuit Damper lock motor Left (ML) Horizontal vane motor(mv) Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 30 C) Color of the lead wire BRN-other one Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 30 C) Color of the lead wire BRN-other one rmal 3" ~ " rmal 3" ~ " Abnormal Open or short-circuit Abnormal Open or short-circuit RED YLW BRN ROTOR ORN GRN Horizontal vane motor(mv) Measure the resistance between the terminals with a tester. (Part temperature 0 C ~ 30 C) Color of the lead wire BRN-other one rmal 8" ~ 306" Abnormal Open or short-circuit 6

27 9-6. Troubleshooting flow When the left lamp of OPERATION INDICATOR lamp flashes 3 times and the right lamp of OPERATION INDICATOR lamp is not lighted. Indoor fan does not operate. A -. Check of indoor fan motor (upper) The indoor fan motor error has occurred, and the indoor fan doesn't operate. Turn OFF the power supply. Pay careful attention to the high voltage on the fan motor connector CN. Is there anything that interferes the rotation of the line flow fan? Remove the object and adjust the line flow fan. Turn ON the power supply, wait seconds or more, and then press EMERGENCY OPERATION switch. Measure the supply voltage as follows within seconds after EMERGENCY OPERATION switch is pressed. If more than seconds passes by, turn OFF the power supply and turn ON it again, then measure the voltage. w ) Measure the voltage between CN (+) and 3(-). ) Measure the voltage between CN (+) and 3(-). wif more than seconds passes after EMERGENCY OPERATION switch is pressed, the voltage mentioned in above ) goes 0V DC although the indoor electronic control P.C. board is normal. Is there 3V DC between CN (+) and 3 (-), and does the voltage between CN (+) and 3(-) rise to the range between 3 and 6V DC within seconds after EMERGENCY OPERATION switch is pressed? Replace the indoor fan motor. Fuse (F) VARISTOR (NR) Indoor electronic control P.C.Board JR0 JR06 IC0 Replace the indoor electronic control P.C. board. R CT CNX CNY CN CN CN CN The indoor fan motor error has occurred, and the indoor fan repeats "-second ON and 30-second OFF" 3 times, and then stops. Measure the voltage between CN 6(+) and 3(-) while the fan motor is rotating. Is 0V DC or V DC held unchanged? (Changed) Replace the indoor electronic control P.C. board. (Unchanged) Replace the indoor fan motor. 7

28 When the left lamp of OPERATION INDICATOR lamp flashes 3 times and the right lamp of OPERATION INDICATOR lamp flashes ON and OFF every 0.-second. Indoor fan does not operate. A -. Check of indoor fan motor (lower) The indoor fan motor error has occurred, and the indoor fan doesn't operate. Turn OFF the power supply. Is there anything that interferes the rotation of the line flow fan? Remove the object and adjust the line flow fan. Pay careful attention to the high voltage on the fan motor connector CN. Turn ON the power supply, wait seconds or more, and then press EMERGENCY OPERATION switch. Measure the supply voltage as follows within seconds after EMERGENCY OPERATION switch is pressed. If more than seconds passes by, turn OFF the power supply and turn ON it again, then measure the voltage. w ) Measure the voltage between CN (+) and 3(-). ) Measure the voltage between CN (+) and 3(-). wif more than seconds passes after EMERGENCY OPERATION switch is pressed, the voltage mentioned in above ) goes 0V DC although the indoor electronic control P.C. board is normal. Is there 3V DC between CN (+) and 3 (-), and does the voltage between CN (+) and 3(-) rise to the range between 3 and 6VDC within seconds after EMERGENCY OPERATION switch is pressed? Replace the indoor fan motor. Fuse (F) VARISTOR (NR) Indoor electronic control P.C.Board JR0 JR06 IC0 Replace the indoor electronic control P.C. board. R CT CNX CNY CN CN CN CN The indoor fan motor error has occurred, and the indoor fan repeats "-second ON and 30-second OFF" 3 times, and then stops. Measure the voltage between CN 6(+) and 3(-) while the fan motor is rotating. Is 0V DC or V DC held unchanged? (Changed) Replace the indoor electronic control P.C. board. (Unchanged) Replace the indoor fan motor. 8

29 Indoor unit operates by pressing EMERGENCY OPERATION switch, but does not 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 the LCD display on the the remote controller visible? (not clear) Replace the batteries. (Refer to 9-.4.) Remove the batteries, then set them back and press RESET button. (Refer to 9-.4.) Check if the unit operates with the remote controller. Does the unit operate with the remote controller? Turn on a radio to AM and press switch on the remote controller. OK Is noise heard from radio? Replace the remote controller. Are there any fluorescent lights of inverter or of rapid-start type within the range of m? Reinstall the unit away from lights. Attach a filter on receiving part. Replace the indoor electronic control P.C. board. 9

30 The unit cannot be operated with the remote controller. Also, OPERATION INDICATOR lamp does not light up by pressing EMERGENCY OPERATION switch. C Check of indoor electronic control P.C. board and indoor fan motor Turn OFF the power supply. Remove indoor fan motor connector CN/ CN and vane motor connector CN/ CN from the indoor electronic control P.C. board and turn ON the power supply. Turn OFF the power supply. Measure the resistance between CN/ CN 3 and 4 of the indoor fan motor connector. Short/ open circuit: Replace the indoor fan motor. Does the unit operate with the remote controller? Does OPERATION INDICATOR lamp light up by pressing EMERGENCY OPERATION switch? Turn OFF the power supply. Measure the resistance of the horizontal vane motor coil. Refer to 9-. Short/ open circuit: Replace the horizontal vane motor and the indoor electronic control P.C. board. Replace the varistor(nr) and fuse(f). Turn OFF the power supply. Check both parts side and pattern side of the indoor electronic control P.C. board visually. Are the varistor(nr) burnt and the fuse(f) blown? Be sure to check both the fuse and the varistor in any case. Is the fuse(f) blown only? Measure the resistance between (+) and 3(-) of the indoor fan motor connector (to CN / CN on the indoor electronic control P.C. board). w, w w. The fan motor connector's lead wire is red, whereas 3 is black. w. Connect "+" of the tester to fan motor connector's lead wire, and "-" to 3 lead wire, otherwise the resistance cannot be measured properly. Is the resistance M' or more? Replace the fuse (F). Replace the fuse (F) and the indoor fan motor. Measure the cement resistance R on the indoor electronic control P.C. board. Is the resistance approx. 4'? Replace the indoor electronic control P.C. board and the indoor fan motor. Indoor electronic control P.C. Board Replace the indoor electronic control P.C. board. Fuse (F) VARISTOR (NR) JR0 JR06 IC0 R CNX CNY C T CN CN CN CN 30

31 When the left lamp of OPERATION INDICATOR lamp flashes ON and OFF in every 0.-second. Outdoor unit does not operate. D How to check mis-wiring and serial signal error Turn OFF the power supply. Is there rated voltage of 30V AC in the power supply? Turn ON the power supply. Check the power supply. Is there 30V AC between outdoor terminal block S and S? Check the wiring. Press EMERGENCY OPERATION switch once. Does the left lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power supply to the indoor unit> Is the serial signal error indicated 6 minutes later? Is there any mis-wiring, poor contact, or wire disconnection of the indoor/outdoor connecting wire? Make them sure. A B Turn OFF the power supply. Check once again if the indoor/outdoor connecting wire is not wrongly connected. Short-circuit the outdoor terminal block S and S3. W Turn ON the power supply of the outdoor unit. W. Mis-wiring may damage indoor electronic control P.C. board during operation. Be sure to confirm the wiring is correct before the operation starts. Inverter P.C.board (Parts side) LED In 3 minutes after turning ON the power supply of the outdoor unit, does the LED on the inverter P.C. board repeat quick blinking "3.6-second-OFF and 0.8-second-ON"? Be sure to check above in 3 minutes after turning ON. After 3 minutes, LED blinks 6 times. When the inverter P.C. board is normal, LED also blinks 6 times after 3 minutes. (Lighting) Replace the inverter P.C. board. W W Be careful to the residual voltage of smoothing capacitor. Blinking A Turn OFF inverter-controlled lighting equipment. Turn OFF the power supply and then turn ON it again. Press EMERGENCY OPERATION switch. Remove the short-circuit between outdoor terminal block S and S3. Is there amplitude of 0 to 0V DC between outdoor terminal block S and S3? <Confirmation of serial signal> Is there any error of the indoor/outdoor connecting wire, such as the damage of the wire, intermediate connection, poor contact to the terminal block? Replace the indoor/outdoor connecting. Is the serial signal error indicated 6 minutes later? B Reinstall either the unit or the light away from the other. Attach a filter on receiving section of the indoor unit. Is there 30V AC between outdoor terminal block S and S? <Confirmation of power voltage> Be sure to release the failure-mode recall function after checking. As for outdoor units, refer to service manual OC3, OB377 or OC36. Replace the indoor electronic control P.C. board. Is there any error of the indoor/outdoor connecting wire, such as the damage of the wire, intermediate connection, poor contact to the terminal block? Replace the indoor/outdoor connecting. 3

32 When the left lamp of OPERATION INDICATOR lamp flashes -time. Indoor unit and outdoor unit do not operate. E Check of damper After performing the check, make sure to release the failure mode recall function. Turn OFF the power supply. Is there anything that interferes the opening or closing movement of the damper? Remove the object. Turn ON the power supply. < Set up the failure mode recall function > Turn ON the power supply. While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds. While pressing both OPERATION SELECT button and TOO COOL button on the remote controller at the same time, press RESET button. First, release RESET button. And release the other two buttons after all LCD except the set temperature in operation display section of the remote controller is displayed after 3 seconds. Press OPERATE/STOP(ON/OFF) button of the remote controller (the set temperature is displayed) with the remote controller headed towards the indoor unit. W W. Regardless of normal or abnormal, a short beep is emitted once as the signal is received. With the remote controller headed towards the indoor unit, press VANE CONTROL button. Does the damper open and close? (rmally, the damper opens and closes each time VANE CONTROL button is pressed.) Fuse (F) VARISTOR (NR) Indoor electronic control P.C.Board JR0 JR06 IC0 Turn OFF the power supply. Measure the resistance according to 9-..Measure the resistance of the damper lock motors (ML, ML)..Measure the resistance of the damper motor (MV). Make the damper open by pressing VANE CONTROL button. R CNX CNY CT CN CN CN CN Replace the motor that indicates the abnormal value. Is the resistance value normal each? Replace the indoor electronic control P.C. board. ) Measure the voltage between CNX (+) and (-). ) Measure the voltage between CNY (+) and 3(-). ) Is there 0V DC between CNX (+) and (-)? ) Is there V DC between CNY (+) and 3(-)? Make the damper close by pressing VANE CONTROL button. ) ) Replace either or both damper limit switches (open, close) as follows. ) : Replace the damper limit switch (open). ) : Replace the damper limit switch (close). ) Measure the voltage between CNX (+) and (-). ) Measure the voltage between CNY (+) and 3(-). ) ) Is there V DC between CNX (+) and (-)? ) Is there 0V DC between CNY (+) and 3(-)? Replace the indoor electronic control P.C. board. ) Replace either or both damper limit switches (open, close) as follows. ) : Replace the damper limit switch (open). ) : Replace the damper limit switch (close). 3

33 F Electromagnetic noise enters into TV sets or radios Is the unit earthed? Earth the unit. Is the distance between the antennas and the indoor unit within 3m, or is the distance between the antennas and the outdoor unit within 3m? Extend the distance between the antennas and the indoor unit, or the antennas and the outdoor unit. Is the distance between the TV sets or radios and the indoor unit within m, or is the distance between the TV sets or radios and the outdoor unit within 3m? Extend the distance between the TV sets or radios and the indoor unit, or the TV sets or radios and the outdoor unit. Are the antennas damaged? Is the coaxial cable damaged? Is there any poor contact in the antenna wiring? Replace or repair the antenna. Replace or repair the coaxial cable. Is the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas in close? Extend the distance between the indoor/outdoor connecting wire of the air conditioner and the wiring of the antennas. Even if all of the above conditions is fulfilled, the electromagnetic noise may enter, depending on the electric field strength or the installation condition (combination of specific conditions such as antennas or wiring). Check the followings before asking for service..devices affected by the electromagnetic noise TV sets, radios (FM/AM broadcast, shortwave).channel, frequency, broadcast station affected by the electromagnetic noise 3.Channel, frequency, broadcast station unaffected by the electromagnetic noise 4.Layout of ; indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, grounding wire, antennas, wiring from antennas, receiver.electric field intensity of the broadcast station affected by the electromagnetic noise 6.Presence or absence of amplifier such as booster 7.Operation condition of air conditioner when the electromagnetic noise enters in. )Turn OFF the power supply once, and then turn ON the power supply. In this situation check for the electromagnetic noise. )Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller for power ON, and check for the electromagnetic noise. 3)After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the electromagnetic noise. 4)Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the indoor/outdoor communication still runs on. In this situation check for the electromagnetic noise. After checking the above, consult the service representative. 33

34 } 9-7. Test point diagram and voltage MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - Indoor electronic control P.C. board E FUSE (F) 3.A 0V Power supply input 30V AC Varistor NR Room temperature thermistor RT V DC Indoor coil thermistor RT4 (MAIN ) Indoor coil thermistor RT3 (SUB) Indoor coil thermistor RT (MAIN ) Indoor coil thermistor RT (MAIN 3) Release of Auto reset function Solder the Jumper wire to JR07. (Refer to 8-3.) } Timer short mode point JPG, JPS (Refer to 8-.) Display, receiver P.C. board FAN/FAN Emergency change switch operation switch Emergency operation switch Horizontal vane motor CN Damper lock motor Right CN Damper motor CN Damper lock motor Left CN 6over V DC 3-6V DC 4V DC 3 30V DC Indoor fan motor (Upper) CN JR0 JR06 Modification point for individual operation (Refer to 8-.) GND DC V DC 6over V DC 3-6V DC 4V DC 3 30V DC Indoor fan motor (Lower) CN Indoor coil thermistor [RT,RT4,RT (MAIN), RT3 (SUB)] Room temperature thermistor (RT) Resistance (k") Temperature (:) 34

35 0 DISASSEMBLY INSTRUCTIONS <"Terminal with locking mechanism" Detaching points> The terminal which has the locking mechanism can be detached as shown below. There are two types ( Refer to () and ()) of the terminal with locking mechanism. The terminal without locking mechanism can be detached by pulling it out. Check the shape of the terminal before detaching. () Slide the sleeve and check if there is a locking lever or not. () The terminal with this connector has the locking mechanism. Sleeve Locking lever Slide the sleeve. Pull the terminal while pushing the locking lever. Connector Hold the sleeve, and pull out the terminal slowly. MFZ-KAVA - E MFZ-KA3VA - E MFZ-KA0VA - INDOOR UNIT OPERATING PROCEDURE E PHOTOS. Removing the panel () Push both sides of the upper part of the front grille and pull the front grille open, and then remove the front grille from the panel. (See Photo.) () Remove the screws of the panel. (See Photo.) (3) Open the horizontal vane and push the left, right and middle of the upper part of the panel, and pull the panel toward you. (See Photo.) (4) Lift up the panel and remove it from the box. Photo Push Grille Push Photo Horizontal vane Screws of the panel Push Push Push 3

36 OPERATING PROCEDURE. Removing the electronic control P.C. board and the display receiver P.C. board () Remove the panel. (Refer to.) () Remove the screw of the electrical cover, and then the electrical cover. (See Photo 3.) (3) Remove the screw of the ground wires under the electrical box, and then the ground wires. (See Photo 4.) (4) Remove the screw of the ground wires connected to the indoor fan motor (lower), and then the ground wires. (See Photo 4.) () Remove the screw of the ground wires connected to the indoor heat exchanger, and then the ground wires. (See Photo 4.) (6) Unhook the lamp cover from the catch. (See Photo 4.) (7) Open the lamp cover and pull out the display receiver P.C. board. (8) Remove the screw of the ground wires connected to the electronic control P.C. board, and then the ground wires. (See Photo 4.) (9) Pull the electronic control P.C. board slightly toward you from the electrical box, and disconnect all the connectors on the electronic control P.C. board. (0) Pull out the electronic control P.C. board from the electrical box. Photo 3 Photo 4 PHOTOS Lamp cover Screw of the electrical cover Screw of the ground wires Screw of the electrical box 3. Removing the electrical box () Remove the panel. (Refer to.) () Remove the electrical cover. (Refer to.) (3) Remove the ground wires from the electrical box. (Refer to.) (4) Remove the ground wires connected to the indoor fan motor and the ones connected to the indoor heat exchanger. (Refer to.) () Remove the screw of the electrical box. (See Photo 4.) (6) Disconnect the following connectors on the electronic control P.C. board.(see Photo.) Fan motor connectors < CN, CN > Horizontal vane motor connector < CN > Damper motor connector < CN > Display receiver P.C. board connectors < CN06, CN > Indoor coil thermistor connectors < CN, CN3 > Room temperature thermistor connector < CN > Damper limit switch connectors < CNX, CNY > (7) Unhook the electrical box from the upper catch and pull out the electrical box from the box. Photo Indoor coil thermistor connector CN3 Display receiver P.C. board connector CN06 Display receiver P.C. board connector CN Horizontal vane motor connector CN Damper motor connector CN Fan motor connector CN Fan motor connector CN 36

37 OPERATING PROCEDURE PHOTOS 4. Removing the horizontal vane motor unit () Remove the panel. (Refer to.) () Remove the screws of the horizontal vane motor unit and pull out the horizontal vane motor unit. (See Photo 6.) (3) Disconnect the connector from the horizontal vane motor unit. Photo 6 Screw of the horizontal vane motor unit. Removing the indoor fan motor (upper) () Remove the panel. (Refer to.) () Remove the electrical box. (Refer to 3.) (3) Remove the nozzle (upper). (See Photo 7.) (4) Unhook the water cover from the catches and remove the water cover. (See Photo 7.) () Removing the screw of the motor band, and then the motor band. (See Photo 8.) (6) Remove the line flow fan and the indoor fan motor (upper) from the box. Photo 7 zzle <Upper> Water cover Photo 8 Screw of the motor band 37

38 OPERATING PROCEDURE PHOTOS 6. Removing the damper lock motor, the damper motor and the damper limit switch () Remove the panel. (Refer to.) () Remove the screws of the nozzle assembly (lower). (See Photo 9.) (3) Remove the drain hose from the nozzle assembly (lower) and pull out the nozzle assembly (lower) toward you. (4) Remove the tape fixing the lead wires of the damper motor and the damper lock motor from the nozzle assembly <lower>. (See Photo 0.) () Remove the screws of the damper lock motor. (See Photo and.) (6) Lift the nozzle slightly and remove the lock shaft from with in the nozzle and remove the damper lock motors (ML, ML). (7) Remove the screws of the damper motor support, and then the damper motor support. (8) Remove the screws of the damper motor, and then the damper motor from the damper motor support. (9) Disconnect the connector from the damper motor. (0) Remove the damper limit switches (LS, LS). Photo 9 Screw of the nozzle Photo 0 Screw of the nozzle Drain hose Lead wires of the damper motor and the damper lock motor 7. Removing the indoor fan motor (lower) () Remove the panel. (Refer to.) () Remove the nozzle assembly (lower) and the drain hose. (Refer to 6.) (3) Remove the screw of the ground wire of the indoor fan motor (lower), and then the ground wire. (See Photo 3.) (4) Remove the screw of the motor band, and then the motor band. (See Photo 3.) () Remove the line flow fan and the indoor fan motor (lower) from the box. Photo Screw of the damper motor support Screw of the damper motor support Screws of the damper motor Screws of the damper lock motor (Left) Photo 3 Photo Screw of the motor band Screw of the ground wire Screws of the damper lock motor (Right) 38