Hitachi RAC-25FXB Service Manual Download Page 90

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13ー3

FIXING SCREW

CN2

CN15

CN11

CN17

CN19

CN4

CN13

Removing the indicating P.W.B.

the control P.W.B.

Removing electrical parts

1. Remove the electrical parts cover.
2. Remove the connectors from the CN4 (heat exchange

thermistor), CN15 (stepping motor), CN19 (stepping motor),
CN2 (fan motor), and CN17 (humidity thermistor).

3. Remove two lock screws.

Removing receiver

1. Remove the connectors from the CN13.

STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS

CN11

RAF-25/35/50RXB

FIXING SCREW

ELECTRICAL COVER

Summary of Contents for RAC-25FXB

Page 1: ... 1 INDOOR UNIT OUTDOOR UNIT RAC 50FXB RAC 35FXB RAC 25FXB RAF 25RXB RAF 35RXB RAF 50RXB INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT RAF 25RXB RAC 25FXB RAF 35RXB RAC 35FXB RAF 50RXB RAC 50FXB KW B T U h 750 590 215 15 750 65 548 288 27 5 34 W H D MODEL POWER SOURCE TOTAL INPUT W TOTAL AMPERES A CAPACITY KW B T U h TOTAL INPUT W TOTAL AMPERES A CAPACITY COOLING HEATIN...

Page 2: ...of any accident such as electrical shock leak of current or bodily injury due to the drop of any part 8 To check the insulation of the unit measure the insulation resistance between the power cord plug and grounding terminal of the unit The insulation resistance should be 1MΩ or more as measured by a 500V DC megger 9 The initial location of installation such as window floor or the other should be ...

Page 3: ...n rejected goods should be handled in the same way 2 When any part is handled uncovered in counting packing and the like the handling person must always use himself as a body earth Make yourself a body earth by passing one M ohm earth resistance through a ring or bracelet 3 Be careful not to touch the parts with your clothing when you hold a part even if a body earth is being taken 4 Be sure to pl...

Page 4: ...ircuits for maintenance inspection or some others be careful not to have the test probes of the measuring instrument short circuit a load circuit or the like Bare copper wire for body earth Metal plate of Al stainless steel etc Working table Resistor 1MΩ 1 2W Earth wire Staple Fig 3 Grounding of the working table soldering iron Grounding wire Screw stop at the screwed part using a rag plate ...

Page 5: ...nd re start in a moment there is occasion that the cooling and heating operation does not start for 3 minutes it is not abnormal and this is the result of the operation of IC delay circuit This IC delay circuit ensures that there is no danger of blowing fuse or damaging parts even if operation is restarted accidentally 5 This room air conditioner should not be used at the cooling operation when th...

Page 6: ...B PM No 0585E RAMͲ90NP5B PM No 0586E RAMͲ110NP6B PM No 0587E for items not described in this manual Combination table RAFͲ25RXB RAFͲ35RXB RAFͲ50RXB RACͲ25FXB RACͲ35FXB RACͲ50FXB RAMͲ33NP2B o Ͳ Ͳ RAMͲ40NP2B o o Ͳ RAMͲ53NP2B o o o RAMͲ53NP3B o o o RAMͲ68NP3B o o o RAMͲ70NP4B o o o RAMͲ90NP5B o o o RAMͲ110NP6B o o o Indoor unit Single outdoor unit Multi outdoor unit ...

Page 7: ...STAT REMOTE CONTROL SWITCH LIQUID CRYSTAL NO NO NO YES G4A 1A NO NO YES YES YES IC NO WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE UNI T PIPES MAX 30m MIN 3m MAX 20m MIN 3m REFRIGERANT CHARGING VOLUME Refrigerant 410A NO NO NO NO NO NO YES NO NO YES IC YES NO ASG133CDNB7AT 870g 1400g ASD084SFNA7JK1 RAF 25RXB RAF 35RXB RAF 50RXB RAC 50FXB RAC 35FXB RAC 25FXB 47W DC120 380V 870g 30W DC325V 3 1...

Page 8: ...rain hose Inner diameter 16mm Please use insulated drain hose for the indoor piping commercial product above 100mm above 300mm above 50mm give clearance as wide as possible above 200mm above 50 mm when installed on the ceiling of balcony above 200mm Maximum pipe length 20m Minimum pipe length 3m Plug Sheet Hanger Be sure to completely seal any gap with putty Drain pipe Must be installed separately...

Page 9: ...Inner diameter 16mm Please use insulated drain hose for the indoor piping commercial product Maximum pipe length 30m Minimum pipe length 3m Plug above 200mm above 200mm give clearance as wide as possible above 300mm above 700mm above 150mm Sheet Hanger Be sure to completely seal any gap with putty Drain pipe Must be installed separately Insulate indoor part of pipe to prevent condensation The indo...

Page 10: ...e batteries will last for approximately 1 year However if the remote controller display begins to fade and degradation of reception performance occurs within a year replace both batteries with new size AAA LR03 alkaline The attached batteries are provided for the initial use of the system The usable period of the batteries may be short depending on the manufactured date of the air conditioner Note...

Page 11: ... may be shorter This unit can be Ú xed on a wall using the Ú xture provided Before Ú xing it make sure the indoor unit can be controlled from the remote controller Handle the remote controller with care Dropping it or getting it wet may compromise its signal transmission capability After new batteries are inserted into the remote controller the unit will initially require approximately 10 seconds ...

Page 12: ...ion will change when the room temperature varies However the mode of operation will not change when indoor unit is connected to multi type outdoor unit VARIOUS FUNCTIONS Auto Restart Control If there is a power failure operation will be automatically restarted when the power is resumed with previous operation mode and airÛ ow direction As the operation is not stopped by remote controller If you in...

Page 13: ...efrosting operation the operation lamp blinks in a cycle of 3 seconds on and 0 5 second off The maximum time for defrosting is 20 minutes However if the indoor unit is connected to multi type outdoor unit the maximum time for defrosting is 15 minutes If the piping length used is longer than usual frost is likely to form 1 2 3 Defrosting 8 DEHUMIDIFYING OPERATION Dehumidifying Function When the roo...

Page 14: ...t the desired FAN SPEED with the FAN SPEED button the display indicates the setting HIGH MED LOW SILENT Press the START STOP button Fan operation starts with a beep Press the button again to stop operation EXTENDED AIRFLOW OPERATION To start Extended Airﬂow operation Press EXTENDED AIRFLOW button during operation is displayed on the LCD The airﬂow direction will automatically set according to the ...

Page 15: ...ust before defrost operation when the air conditioner is running in HEATING operation After auto restart POWERFUL operation is cancelled and previous operation shall start For multi model connections POWERFUL operation may not function depending on operation conditions 12 SILENT OPERATION By pressing SILENT button during AUTO HEATING DEHUMIDIFYING COOLING or FAN operation the fan speed will change...

Page 16: ...temperature automatically and by limiting the maximum power consumption value 14 ECO OPERATION By pressing the ECO button during AUTO HEATING DEHUMIDIFYING or COOLING operation the air conditioner performs the ECO operation 1 To start ECO operation To cancel ECO operation Press ECO button during operation is displayed on the LCD A beep sound is emitted from indoor unit and the ECO lamp on the indo...

Page 17: ...ain the unit will operate in previous mode During Leave Home operation fan speed and horizontal air deÛ ector position cannot be changed By pressing Leave Home button implementation of Weekly Timer or Once Timer is cancelled In case of power supply shut down after autorestart all setting for number of days operation will be reset and unit shall be in continuous operation POWERFUL SILENT and ECO op...

Page 18: ...el Reservation Point the signal window of the remote controller towards the indoor unit and press CANCEL button and ON or OFF set time goes out with a beep and the TIMER lamp on the indoor unit turns off NOTE User can set only one of the OFF timer ON timer or ON OFF timer If WEEKLY TIMER already set by setting the ONCE TIMER ONCE TIMER operation is prioritized When ONCE TIMER operation is complete...

Page 19: ...s possible to select Mode A or Mode B For each mode up to 6 programs can be set per day In total a maximum of 42 programs can be set for a week for each mode If calendar and clock are not set the reservation setting for WEEKLY TIMER cannot be set If calendar and clock are not set correctly WEEKLY TIMER will not operate correctly Reservation for calendar and clock shall be set Ú rst before operatin...

Page 20: ...me and program number 6 shall have the latest time If the setting time is the same Priority will be given to the latest reservation contents CAUTION If the remote controller is left idle and SEND button is not pressed within 3 minutes after reservations have been made all current reservations will be lost WEEKLY TIMER OPERATION 22 How to select Mode A or Mode B of WEEKLY TIMER setting 1 Press WEEK...

Page 21: ...amp lights up If TIMER lamp does not light up Press SEND button again Reservation data will not change if SEND button is not pressed Step 3 Copy and cancel the reservation schedule NOTE If there is no reservation data copying data from one day to another day cannot be done 1 2 3 4 5 6 8 WEEKLY TIMER OPERATION 24 Step 3 Copy and cancel the reservation schedule How to delete WEEKLY TIMER data Delete...

Page 22: ...retrieved from indoor unit To check monthly power consumption Press INFO button Temperature will be displayed for 10 seconds Direct the remote controller towards the receiver of indoor unit within 2 meters in front of indoor unit and press INFO button Wait for 2 seconds for signal transmission Once received the current calendar and clock check whether they are correct or not by pressing CLOCK butt...

Page 23: ...d will remain This indicates that COOLING and DEHUMIDIFYING mode operation is locked When pressing MODE button or will be displayed Method to unlock COOLING and DEHUMIDIFYING modes including FAN operations Press ECO and SILENT buttons simultaneously for about 5 seconds when the remote controller is OFF All operation mode symbols will appear on the display for about 10 seconds After that operation ...

Page 24: ...atch fire if flammable gas leaks around it Should abnormal situation arise like burning smell please stop operating the unit and turn off the circuit breaker Contact your fire may occur if you continue to operate the unit under abnormal situation agent Fault short circuit or 3 DEUTSCH SIAÇNARF ONAILATI HSINAPS SÊUGUTROP ЙИКССУР ENGLISH s t n a l p e h t r o f d a b s i t i s a w o l f r i a e h t ...

Page 25: ...ion mode is selected During automatic operation When heating operation is automatically selected for the first indoor unit the next indoor unit will then start to heat Also if cooling or dehumidifying is automatically selected for the first indoor unit the next indoor unit will also start to cool or dehumidify 5 HSILGNE DEUTSCH SIAÇNARF ONAILATI HSINAPS SÊUGUTROP ЙИКССУР Open the front panel s To ...

Page 26: ... button it returns to the proper angle automatically after a certain period of time In this case press AUTO SWING button to adjust the deflector to your preferred angle again 7 CIRCUIT BREAKER When you do not use the room air conditioner set the circuit breaker to OFF HOW TO USE THE AIR CONDITIONER EFFECTIVELY 1 An average room temperature setting is probably the best for you as well as being econ...

Page 27: ...turn off the circuit breaker hands on the heat exchanger fins When cleaning the heat exchanger with a vacuum cleaner make sure to wear gloves so as not to injure your Upper side filter Front side filter 9 Removing Press the hook found at the tip of the resin band installed inside the front panel s right section to remove the resin band 2 HOW TO INSTALL AND REMOVE THE FRONT PANEL 4 MAINTENANCE AT B...

Page 28: ... become unstable It could collapse or fall causing injury WHEN ASKING FOR SERVICE CHECK THE FOLLOWING S T N I O P G N I W O L L O F E H T K C E H C N O I T I D N O C Do the batteries need replacement Is the polarity of the inserted batteries correct Is the air filter blocked with dust Is the set temperature suitable Have the top and bottom air deflectors been adjusted to their correct positions ac...

Page 29: ...stable Foreign matter or water accidentally enters the unit interior The power cord gets excessively hot or its insulation is torn or stripped TIMER lamp on the indoor unit display blinks As the nature of the failure can be identified by the blinking cycle check the blinking cycle before turning off the circuit breaker Please contact your sales agent immediately if the air conditioner still fails ...

Page 30: ... 641 ø5Hole for fixing to floor 17 Drain hose 170 55 ø65standard underfloor piping hole position 466 714 345 17 272 314 56 71 150 165 215 79 ø9 Rear fixing hole for anchor bolt Ore more 150mm Or more 150mm Or more 100mm 30 Ore more 150mm Lattice door 61 81 15 115 19 3 60 220 4 Small dia pipe ø6 35 Large dia pipe RAF 50RXB ø12 7 RAF 35RXB ø9 52 RAF 25RXB ø9 52 Or more 150mm Wireless remote controll...

Page 31: ...ain hole More than 50 More than 100 More than 200 More than 300 Service space More than 200 NOTE 1 For outdoor unit installation allow at least 2 sides of space around the unit ensure ventilation flue 2 The connecting pipe should all the insulated with insulation pipe 3 Piping length is within 20m 4 Height d fferent of the piping between the indoor unit and outdoor unit s ould be within 10m h i MO...

Page 32: ...The connecting pipe should all the insulated with insulation pipe 3 Piping length is within 20m 4 Height d fferent of the piping between the indoor unit and outdoor unit s ould be within 10m h i MODEL RAC 50FXB More than 200 880 5 800 74 6 5 736 408 5 350 111 5 35 5 23 30 706 175 103 5 543 5 133 12 50 395 361 10 202 5 More than 50 More than 100 More than 700 More than 200 ...

Page 33: ...VIO VIOLET RAF 25 35 50RXB RAC 25 35 50FXB CONNECTION MODEL E C R U O S R E W O P T U P T U O DC 280V W 8 3 Control circuit built in M WHT RED YEL 0 6 5V 0V V 15V BLU BLK 280 V 0 8 3 0 2 1 C D W 7 4 WHT V BLK W M M M RED U RAC 25 35FXB REACTOR RAC 50FXB 5 3 mH 67m 15 mH 230 m MAX 20 C MODEL THERMOSTAT MODEL IC OPERATION MODE HEAT COOL ON 15 3 59 54 16 7 62 06 OFF 15 0 59 00 16 7 62 06 ON 23 3 73 9...

Page 34: ...s been operated for a long time with the capillary tubes clogged or crushed or with too little refrigerant check the color of the refrigerating machine oil inside the compressor If the color has been changed conspicuously replace the compressor U V W M M M WHITE YELLOW RED ASD084SFNA7JK1 U V W 75 2M 0 74 2M 0 88 2M 2 4 2M 2 0 RAC 25 35FXB ASG133CDNB7AT 100 240 V 220 350 V RAC 50FXB ...

Page 35: ...ＧＰＷＢＬＩＧＨＴＲＥＣＥＩＶＩＮＧＵＮＩＴＧＲＹＧＲＡＹＲＥＤＲＥＤＢＬＫＢＬＡＣＫＷＨＴＷＨＩＴＥＳＷＩＴＣＨＰＷＢ３１ＦＵＳＥＦＵ１３１５ＡＶＡ００１ｕＲ００２Ｃ００１Ｃ０１１Ｃ０１２Ｃ０１４Ｃ０１３Ｃ００２Ｃ００３ＴＨ００１ＤＢ１ＰＯＷＥＲＣＩＲＣＵＩＴＮＦ１ＣＮ２Ｍ１７４ＲＥＤＢＬＫＷＨＴＹＥＬＢＬＵＢＬＫＷＨＴＲＥＤＢＬＫＲＥＤＢＬＫＧＲＹＧＲＹＲＥＤＣＮ３２１ＣＮ４１６ＣＮ７ＨＬＩＮＫＷＩＲ...

Page 36: ...WIRING DIAGRAM OF THE PRINTED WIRING BOARD Remote controller RAR 6N4 SWB SW10 Carbon SW Reset carbon SW EXTENDED SWING 5ー2 ...

Page 37: ...26 R232 R233 2125 R321 R322 R323 R324 R325 R326 1 4 1 10 1 8 C C C C C C R122 RCR R004 HVL 3226 R101 R102 R103 1608 1608 R309 680 1005 43 46 47 7 5 MOS 3 3k 4 7k 4 3k 4 3k 5 5 5 5 5 5 R663 R664 10k 10k 5 1 16 C 5 1 16 C 10k 5 1 16 C R405 R503 5 1 16 C 300k 1005 1005 1005 1005 1005 1005 1005 1005 1005 5 1 16 C 1005 1608 1005 1005 1005 R623 10k 5 1 16 C 68 1005 R631 10k 5 1 16 C 68 1005 R632 5 1 16 ...

Page 38: ...RAC 25 35FXB MODEL 6ー2 ...

Page 39: ...RAC 50FXB MODEL 6ー3 ...

Page 40: ... motor Small SUCTION DEFLECTOR MOTOR Operation Timer Indoor microcomputer Stepping motor drive circuit Outdoor microcomputer Wireless remote controller Wireless receive Reset circuit Control Power circuit Room temperature thermistor Heat exchanger thermistor Oscillator clock circuit Indoor Outdoor interface circuit Indoor Outdoor interface circuit Power circuit Indoor DC fan motor M M M M M M M Co...

Page 41: ...d heat exchanger temperature Set to stop if the heat exchanger temperature is DNZKOF during Thermo OFF When reach at DNZKON fan speed set to ultra Lo again Set to ultra Lo Silent Lo Med Hi ultra Hi or stop depending on the room temperature time and heat exchanger temperature Set to stop if the heat exchanger temperature is DNZKOF during Thermo OFF When reach at DNZKON fan speed set to ultra Lo aga...

Page 42: ...UT_H 2 00 C 2 00 C 1 00 C FCAUT_L 0 66 C 0 66 C 0 00 C TEION 2 00 C 2 00 C 1 00 C TEIOF 9 00 C 9 00 C 9 00 C PDCIN2 50 00 C 50 00 C 50 00 C PDCOF2 44 00 C 44 00 C 44 00 C DNZKON 15 00 C 15 00 C 15 00 C DNZKOF 13 00 C 13 00 C 13 00 C DASUPHH 45 00 C 45 00 C 45 00 C DASDNHH 44 00 C 44 00 C 44 00 C DASUPH 44 00 C 44 00 C 44 00 C DASDNH 40 00 C 40 00 C 40 00 C DASUPL 40 00 C 40 00 C 40 00 C DASDNL 37 ...

Page 43: ...e 3 During Cool Dashed operation thermo off temperature is set temperature with shift value 3 C After thermo off operation continue in Fuzzy control mode 4 Compressor minimum ON time and OFF time is 3 minutes 5 During normal cooling mode compressor maximum rpm CMAX will maintain for 60 minutes if indoor temperature is lower than CLMXTP No time constrain if indoor tem perature is higher than CLMXTP...

Page 44: ...n wil cancel the powerful operation 5 If the sleep timer is set during powerful operation the powerful operation will be canceled 6 When the powerful operation is set the fan speed will be set to HIGH and the compressor s maximum speed will be set to CMAX2 during powerful operation The compressor s lower limit speed is CKYMIN_PW 7 The fan speed increases by FNUPPW_C 8 After the powerful operation ...

Page 45: ...The indoor fan is operated in the Lo mode During thermo OFF indoor fan will be OFF for 5 minutes and ON for 1 minute 3 When the operation is started by the themostat turning ON the start of the indoor fan is delayed 32 seconds after the start of compressor operation 4 The compressor is operated forcedly for 3 minutes after operation is started 5 The minimum ON time and OFF time of the compressor a...

Page 46: ...6 If the differential the room temperature the temperature setting is the differential 3 C after powerful setting the compressor s maximum speed during powerful operation will be set to SDMAX Then the differential reduce the differential 2 33 C during powerful operation the compressor s speed will be set to SDRPM If the differential the room temperature the temperature setting is the differential ...

Page 47: ...strain if room temperature is 18 or less and outdoor temperature is 2 or less 6 During preheating or defrosting or auto fresh defrosting mode indoor unit operation lamp will blink at interval of 2 seconds ON and 1 second OFF 7 When heating mode starts it will enter into preheating mode if indoor heat exchanger temperature is less than YNEOF 0 33 8 When fan is set to Med or Lo or Silent compressor ...

Page 48: ...FCLN_SUF_P P _ M A W _ N L C F CLNCMP Silent button WSZMAX CSZMAX Compresson speed Indoor fan Outdoor fan SILENT Notes Can t set POWERFUL and SILENT at the same time 8ー8 ...

Page 49: ...ul operation The compressor s lower limit 8 After the powerful operation is ended the system automatically operates with the previous settings speed is WKYMIN_PW used before the powerful operation the powerful operation Setting Defrosting Inhibit Period DFTIM_OT P5 DFTIM_OT P0 DFTIM_OTP 10 Time Outdoor temperature 10 5 C 0 C Notes 1 The first inhibit time after operation start is set to DFTIM_FST ...

Page 50: ...Outdoor fan Hi or Lo Hi or Lo Operation lamp Ultra Lo Hi 15 or more Auto fresh defrosting Stop Reverse cycle period Reverse cycle period 20 MAX Over defrosting inhibit period Start Stop button Fan speed set to Hi Defrost signal Preheating judgment Preheating released Indoor fan Hi Med Lo Ultra Lo Outdoor fan Operation lamp Reversing valve heating on mode Hi or Lo Deceleration period Reverse cycle ...

Page 51: ...35FXB MODEL COOLING CYCLE INDOOR UNIT OUTDOOR UNIT HEATING CYCLE INDOOR UNIT OUTDOOR UNIT ø8 0 ø8 0 ø12 7 Silencer Silencer Indoor heat exchanger ø7 0 ø7 0 ø7 0 ø7 0 ø12 7 Silencer ø8 0 ø8 0 ø12 7 Silencer Indoor heat exchanger ø7 0 ø7 0 ø7 0 ø7 0 ø12 7 ...

Page 52: ...G CYCLE INDOOR UNIT OUTDOOR UNIT RAF 50RXB RAC 50FXB MODEL REFRIGERATING CYCLE DIAGRAM ø8 0 ø8 0 ø12 7 Silencer Silencer Indoor heat exchanger ø7 0 ø7 0 ø7 0 ø7 0 ø12 7 Silencer ø8 0 ø8 0 ø12 7 Silencer Indoor heat exchanger ø7 0 ø7 0 ø7 0 ø7 0 ø12 7 ...

Page 53: ...er side 2 pieces total 4 pieces 4 Close the front panel To close the front panel press at the top left and right corners of the front panel Press the upper center part of the front panel to close properly 5 Upper side filter Front side filter Removing Press the hook found at the tip of the resin band installed inside the front panel s right section to remove the resin band Be sure to use both hand...

Page 54: ... front cover frame and insert Put the horizontal air deflector to the After fixed the front cover fix back all the to the cabinet screws in order Hold both sides of the lower part of front cover and pull down towards an oblique direction 4 Install the front cover 3 Remove the front cover Latch Latch Screw Screw Screw Screw Cap Upper Louver Upper Louver Horizontal Air Deflector Horizontal Air Defle...

Page 55: ...e 4 Slide the indicating P W B case to the right while removing it from the suction frame 6 ELECTRICAL PARTS CASE 1 Remove the front panel and the front cover 2 Remove the two fixing screws of the electrical parts case Suction frame fixing screws Suction frame indicating P W B indicating P W B fixing screw Electrical parts case Screw for earth Fixing screws Electrical parts case ...

Page 56: ...f Discharge frame 5 Lower the rear side of the discharge frame remove the tab on the interfit section and then pull out the discharge frame towards you 8 DISCHARGE FRAME AUTO SWEEP MOTOR Cabinet Interfit hole Discharge frame tab Discharge frame tab Rat prevention cover Light receiving unit Auto sweep motor 1 Auto sweep motor 2 Rat prevention cover screw Discharge frame fixing screws Fixation hook ...

Page 57: ...orator is lifted up and remove 4 Two screws that is the fixation of fan motor support is removed and fan motor support is removed 5 The tangential air flow fan and fan motor are fixed with screw Please loosen screw when you remove Fixation tab Evaporator Fixation screws Fan motor support fixation screws Fan motor Fan motor Fixed screw Fan motor support Tangential air flow fan ...

Page 58: ...ice valve cover 3 Remove the terminal plate cover 4 Remove the right side cover 5 Remove the electrical box fixing screws and GND wire fixing screw 6 Remove P lock which binds lead wires 8 Remove P W B fixing screws 2 locations and radiation fin fixing screws 5 locations and remove the P W B from the support 7 Set the electrical box upside down MODEL RAC 25FXB RAC 35FXB ...

Page 59: ...e cover to remove it 3 Remove the front cover lock screw 4 Lower the right side of the front cover and pull it forward Then remove the cover from the hook 5 Pull the right side of the front cover a little and pull up the left side to remove it from the hook 6 Remove each connector and earth cable from the lead wire Then remove the electrical box MODEL RAC 50FXB ...

Page 60: ...V and 8 5 V respectively The primary 18 5 V is supplied to the drive circuit of the indoor fan motor the 12 V is supplied to each vane motor and to the drive circuits of the cleaning unit driving motor and other equipment and the 8 5 V is adjusted to a stable 5 V by the 3 terminal regulator IC IC101 IC103 and supplied to the microcomputer peripheral circuit If a failure in a part or circuit has pr...

Page 61: ...input is Lo for resetting and Hi for heating Waveform of each part when switching ON the power and when shutting down is shown in the Fig 2 2 After switching ON the power pin of IC501 supply voltage and pin of microcomputer becomes Hi when DC5V line rises and reaches approximately 4 4V or higher Then resetting will be cancelled and microcomputer starts operating After shutting down the power pin o...

Page 62: ...k control Typical circuit waveform of microcomputer between 0 V and pin 45 FG voltage of fan motor between pins 4 and 7 of CN2 When slow 700min 1 1 7ms When fast 1200min 1 1 7ms 5V 5V When slow 700min 1 7 1ms When fast 1200min 1 15V 15V 4 2ms 1300min 1 2 1V 5 4V Fig 3 1 Fig 3 2 Indoor fan motor Primary 325V Primary 18 5V Power siganl of indoor fan from pin 57 of microcomputer Primary 0 V Rotation ...

Page 63: ...eception input pin of microcomputer Beep reception tone INPUT GND 66 computer After the amplitude of this signal has been set to 12Vp p by a transistor r R640 C632 The indoor fan motor and drive circuit are connected to the primary power supply They therefore have voltage to ground Guard against electric shocks ny circumstances detach or reattach a connector Any such practice would cause a high vo...

Page 64: ...mistor Circuit Heat exchanger temperature is noticed inside the room 1 Preheating 2 Low temperature defrosts at cooling and dehumidification operation time 3 Not working of reversing valve or detection of opening of heat exchange thermistor is controlled According to heat exchange temperature the voltage of point becomes as it is shown in Fig 9 2 Heat exchanger thermistor Microcomputer Heat exchan...

Page 65: ...11ー6 10 10 10 10 10 R901 R904 R641 R907 R908 R694 R902 R695 R741 R740 R642 DSW1 DSW1 R903 R905 R906 ...

Page 66: ...r and outdoor microcomputers directly output a signal demodulated at 30 kHz Typical communication waveform Signal between F cables 1 and 2 Enlarged waveform Fig 11 2 Fig 11 1 Signal sent by indoor microcomputer Signal sent by outdoor microcomputer Signals sent by indoor and outdoor microcomputers Signal between F cables and The unit is receiving a signal that it sent it is not used particularly as...

Page 67: ...uter IC601 and then the driver IC and excites the coil of each stepping motor Fig 12 1 12 Stepping motor drive circuit Some models not need to install the horizontal sweep motor VERTICAL SWEEP MOTOR1 Small SUCTION DEFLECTOR MOTOR M HORIZONTAL SWEEP MOTOR ø4 VERTICAL SWEEP MOTOR2 Big CN15 CN19 HORIZONTAL SWEEP MOTOR ø3 HORIZONTAL SWEEP MOTOR ø2 HORIZONTAL SWEEP MOTOR ø1 VERTICAL SWEEP MOTOR1 ø4 VER...

Page 68: ...11ー9 L N 300 330 A B Main parts C021 C023 500 450V RAC 25 35FXB MODEL ...

Page 69: ... control IC ICI switching transformer 1 B 12V Power supply for electrical expansion valve 2 16V Power supply for IPM driver circuit of compressor and fan motor IGBT action 3 12V Power supply for 4 way valve relay power relay inrush current relay motor current amplification 4 5V Power supply for microcomputer peripheral circuits ...

Page 70: ...C DC12V DC5V 001 C002 C003 C004 C005 C011 C013 C014 NF1 1 2 5 8 L105 JUMPER D110 EARTH L104 JUMPER D110 EARTH L103 JUMPER D110 EARTH R120 B 12V R120 B 0V B 12V O P Expansion valve Main parts 1 2 2 3 0 5V 1 5V 1 0V 15 5 2 5V 1 0V 13 ...

Page 71: ...ed to control the realy ON OFF of the revesing valve and also control the coil of the reversing valve ON OFF The realay ON OFF has different type when in the different operation mode You can see each operation mode as fllows If the reaversing valve not connected or all the condition not the same as follow it may be something wrong with the reversing valve circuit micon 4 1 RL3 RL3 coil 11 34 4 Rev...

Page 72: ...11ー13 5 5 1 10 11 12 74 74 70 70 74 75 5 1 HIC P W B 74 70 75 ...

Page 73: ...gnals Instruct your users to use new alkaline batteries Does the remote control unit have a sufficient battery capacity If the liquid crystal display becomes extremely faded when a remote control signal is sent replace the batteries No Press the reset switch of the remote control unit then conduct another operation check Has the product worked Yes Instruct your users to be sure to press the reset ...

Page 74: ...11ー15 2A Fuse DC300 330V 7 7 1 ...

Page 75: ...11ー16 2A DC300 330V ...

Page 76: ...11ー17 L N 300 330 A B MODEL RAC 50FXB ...

Page 77: ...11ー18 300 330 C021 C023 500 450V 16V R249 33 ACT IP CUT 30 ...

Page 78: ... control IC ICI switching transformer 1 B 12V Power supply for electrical expansion valve 2 16V Power supply for IPM driver circuit of compressor and fan motor IGBT action 3 12V Power supply for 4 way valve relay power relay inrush current relay motor current amplification 4 5V Power supply for microcomputer peripheral circuits ...

Page 79: ...IC DC12V DC5V 001 C002 C003 C004 C005 C011 C013 C014 NF1 1 2 5 8 L105 JUMPER D110 EARTH L104 JUMPER D110 EARTH L103 JUMPER D110 EARTH R148 B 12V B 12V O P Expansion valve Main parts 1 2 2 3 0 5V 1 5V 1 0V 15 5 2 5V 1 0V 13 1 0 4 C ...

Page 80: ...ed to control the realy ON OFF of the revesing valve and also control the coil of the reversing valve ON OFF The realay ON OFF has different type when in the different operation mode You can see each operation mode as fllows If the reaversing valve not connected or all the condition not the same as follow it may be something wrong with the reversing valve circuit micon 4 1 RL3 RL3 coil 11 4 Revers...

Page 81: ...11ー22 5 5 1 74 74 70 70 74 75 5 1 HIC P W B 40 41 42 74 70 75 ...

Page 82: ...11ー23 6 Electric expansion valve circuit 5 13 14 15 16 4 3 2 1 68 67 66 65 RED 14 12 10 7 6 1 8 6 1 6 2 22 23 24 2 ...

Page 83: ...11ー24 2A Fuse DC300 330V 7 1 7 ...

Page 84: ...11ー25 2A DC300 330V ...

Page 85: ...ars At the first of the heating the product will run for 30 seconds with a Low When set to Hi the product will begin with a Low operation producing a Med for 30 seconds and then switch to Hi A2 A3 When heating is conducted despite the high outdoor temperature the product may stop to protect its equipment The auto fresh defrost should be working When stopped the product will check its outdoor unit ...

Page 86: ... activate a preliminary operation for 1 minute At that time heating will cause the operation lamp to blink This is not a sign of a breakdown A5 The room structure air stream or other factor may cause a gap between the room temperature setting and actual room temperature If there is any difference between the setting and the room temperature adjust the temperature setting to match the living space ...

Page 87: ...ent time The timer cannot be set unless it is set to the current time A1 When set to the current time setting the reading blinks for about 3 minutes Wireless remote control I set the sleep timer during operation But the indoor fan will not run it will not produce wind wind intensity will not change Q5 I tried to change the setting with the room temperature button of the remote control unit in vain...

Page 88: ...lloscope will be subjected to voltages as illustrated in the figure above Warning Warning Power supply Power circuit Control circuit Control circuit Inspection instructions Indoor fan motor Outdoor Electrical Indoor Electrical 1 2 3 L N 0V line Power circuit Compressor motor Voltage between each part and ground Grounding voltage Potential at points Potential at points 320V Potential at points 1Φ23...

Page 89: ...ch circuit part of the outdoor unit be sure to discharge the smoothing capacitors Discharge Procedure 1 Turn off the power 2 After power is turned off wait for 10 minutes or more Then remove electrical parts cover and apply soldering iron of 30 to 75 W for 15 seconds or more to IPM 25 and IPM 33 terminals on the main P W B as shown in the figure below in order to discharge voltage in smoothing cap...

Page 90: ...lectrical parts cover 2 Remove the connectors from the CN4 heat exchange thermistor CN15 stepping motor CN19 stepping motor CN2 fan motor and CN17 humidity thermistor 3 Remove two lock screws Removing receiver 1 Remove the connectors from the CN13 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS CN11 RAF 25 35 50RXB FIXING SCREW ELECTRICAL COVER ...

Page 91: ...t will destroy it Be on guard When reconnecting it insert it securely all the way home All the receptacles for connecting tab terminals are with a locking mechanism Forcibly pulling any such receptacle without unlocking it will destroy it Be on guard When reconnecting it insert it securely all the way home Pinch the locking mechanism with your fingers and pull it out unlocked Other instructions 1 ...

Page 92: ...or or outdoor communications is in a failure The product stores 5 last stored failure modes There is a function for deleting memory Once you clear the memory and run the product for several days you can read the failure modes and check them thereby detecting the less frequent failure phenomena Failure modes can be checked by both the blinking of the lamp of the indoor unit and the display of the r...

Page 93: ...DOOR REFRIGERANT CYCLE DEFECTIVE INDOOR THERMISTOR DEFECTIVE 4 TIMES FU1 3 15A FUSE BLOWN REPLACE THE PART WHICH CAUSED BLOWING DISCONNECTION OF FU1 3 15A FUSE ACTION REPLACEMENT PARTS etc FORCED COOLING OPERATION FAILURE OF CONTROL P W B REFER TO THE SERVICE GUIDE FOR HOW TO DETERMINE THE FAILED PART OUTDOOR UNIT DEFECTIVE ABNORMAL ROTATING NUMBERS OF DC FAN MOTOR INTERFACE DEFECTIVE OUTDOOR CHEC...

Page 94: ...13ー7 91 ...

Page 95: ...13ー8 IC531 IC531 IC531 ...

Page 96: ...13ー9 SELF DIAGNOSIS LIGHTING MODE RAC 25 35FXB MODEL ...

Page 97: ...13ー10 SELF DIAGNOSIS LIGHTING MODE RAC 50FXB MODEL ...

Page 98: ... hours and other factors of the day so that the phenomenon may not be able to be identified at the time of a repair service visit In that case too use the self diagnosis memory function 2 The outdoor self diagnosis display overload lower limit cut and OH thermistor heat up can be identified only when you are using the self diagnosis lamp of the outdoor unit and the self diagnosis memory function o...

Page 99: ...k 3 Is the compressor of the outdoor unit running Yes No If you responded No to Check 2 Check 4 Does the emergency operation switch work Yes No First check the failure phenomenon and status and then move on to elaborate diagnosis Initiating troubleshooting No Yes Turn off the power wait at least 5 seconds turn it back on and observe the way the horizontal vanes move for about 30 seconds Check 1 Ha...

Page 100: ... phase 3 wire power supply If the 3 15 A fuse has blown out eliminate the cause of the fuse blowout Otherwise there will occur another fuse blowout If the 3 15 A fuse has blown out due to an abnormally high voltage to the power supply the varistor VA001 will deteriorate and become destroyed as well On a repair service visit due to the failure phenomenon of The power will not become turned on take ...

Page 101: ...gnals Instruct your users to use new alkaline batteries Does the remote control unit have a sufficient battery capacity If the liquid crystal display becomes extremely faded when a remote control signal is sent replace the batteries No Press the reset switch of the remote control unit then conduct another operation check Has the product worked Yes Instruct your users to be sure to press the reset ...

Page 102: ...g unit output usually shows a noise waveform as shown in the right hand figure In the case of slight jamming this kind of waveform will not cause practical problems However intense degrees of jamming will disable the reception of remote control signals When the fluorescent lamp is old and is flickering it may cause disorders in the reception of remote control signals Actions proposed 1 Make it har...

Page 103: ... noises coming from other electrical products Turn on and off the electrical products turn off the power and turn on the power and check their effects on the reception of remote control signals For products whose operating states change check the effects of each state Actions proposed Change the location relationship between the air conditioner and the target products Use a different wall outlet f...

Page 104: ...nge of the indoor unit blinking Yes Yes Yes No No No Check for failures according to the self diagnosis display Did the self diagnosis lamp LD301 of the outdoor unit blink once or become turned off Check for failures according to the self diagnosis display Remove the connector CN4 of the room temperature thermistor and heat exchanger thermistor and measure the thermistor resistance Did the reading...

Page 105: ...ater Estimated failure locations Indoor fan motor Fan motor drive circuit Diagnosis flow Initiating troubleshooting Yes Replace the indoor fan motor No Replace the indoor electrical parts Run the product by remote control and then stop it Reproduce the failure phenomenon Is the voltage between pins and of the fan motor connector CN2 below 1 5 V Take measurements while the failure phenomenon is pre...

Page 106: ...inserting it into the terminal board securely Detach the connector CN3 from the terminal board temperature fuse and check the temperature fuse for continuity Is the resistance almost 0 No Yes Initiating troubleshooting Replace the indoor electrical parts Replace the terminal board Estimated failure locations Outdoor unit error Please confirm the times of the LD301 blinking and then Situation The t...

Page 107: ...blinks 9 times and the product will not run Estimated failure location Loose connector wire break or short circuit in the room temperature thermistor heat exchanger thermistor Cautions Starting the product by remote control will initiate failure detection Merely turning on the power will not activate the failure detection function Diagnosis flow Initiating troubleshooting Yes Yes No No Correct the...

Page 108: ... the indoor fan motor Indoor fan motor mechanically locked Indoor fan motor Indoor fan motor drive circuit Diagnosis flow Initiating troubleshooting No No No No No No No Yes Yes Yes Remove the cause of the mechanical lock Is the indoor fan motor connector CN2 securely inserted Is it free of wire breaks Correct the connector and wiring For 2 to 3 seconds after startup by remote control did a voltag...

Page 109: ...from errors Yes Yes Yes Yes No No No No Correct the F cable connection Is the CN securely inserted into the outdoor board Correct the connector Press the START STOP button on the remote control unit and start the product Are terminals 1 and 2of the terminal board of the electrical parts of the outdoor unit subjected to Take measurements within 3 minutes after remote control operation Check the ele...

Page 110: ...oothing capacitor Replace the outdoor electrical parts Is the power circuit normal For details see the page on the power circuit Is the 3 A fuse blown out Replace the outdoor electrical parts in the case of an abnormality in the power circuit normal Just in case put the power on one The LD301 will not go on and the power circuit is normal Replace the outdoor electrical parts in the case of an abno...

Page 111: ...al parts in the case of an abnormality in the communication circuit Correct the abnormal location Abnormality in equipment other than the electrical parts The LD301 blinks once Reset stopped If the indoor unit is either of the following states it will blink once Ionmist in progress 2 hours before the ON timer Turn the power back on run the product either by remote control or by using the forcible ...

Page 112: ...cooling switch Replace the outdoor electrical parts in the case of an abnormality in the communication circuit Correct the abnormal location Abnormality in equipment other than the electrical parts The LD301 blinks once Reset stopped If the indoor unit is either of the following states it will blink once Ionmist in progress 2 hours before the ON timer Turn the power back on run the product either ...

Page 113: ...of an abnormality in the thermistor detection circuit Check the OH thermistor for wire breaks and short circuits Replace the OH thermistor Check if the OH thermistor is not loose or poorly inserted Connect the OH thermistor Normal Normal Normal Normal Normal Review the freezing cycle Refrigerant leakage or other reason is conceivable If reviewing the freezing cycle does not correct the problem rep...

Page 114: ...wer limit cut When cooling Is the heat exchanger of the outdoor unit clogged up Is there shelter around When heating Is the heat exchanger or filter of the indoor unit clogged up Is the freezing cycle abnormal Remove the cause of the problem Correct the abnormal location Since the compressor load was heavy the product was stopped Yes No No No Yes Yes Clear up the causation Does the service valve o...

Page 115: ... in the outdoor fan motor or outdoor electrical parts After restarting the product will run continuously It stops Check the outdoor fan motor For details see the page on the outdoor fan motor or the instruction plate on the lid of the electrical parts Is the outdoor fan motor abnormal Fan motor abnormal Replace the outdoor fan motor Fan motor normal Replace the outdoor electrical parts in the case...

Page 116: ...tive Replace it and seal refrigerant If the compressor checker for an inverter type air conditioner is available re check using it JUDGING BETWEEN GAS LEAKAGE AND COMPRESSOR DEFECTIVE Blinking off Time until the lamp lights Approx 10 seconds Approx 10 seconds Approx 10 seconds Within Approx 30 seconds Compressor Compressor Gas leakage Possible malfunctioning part LD301 Self diagnosis lamp Lighting...

Page 117: ...op the operation using the remote controller Temporary operation switch If you release your finger from the test switch within 1 sec to 5 sec after pressing the switch the forced cooling operation starts If you press the test switch for 5 sec or longer the self check diagnosis starts In this case turn the power off and start the procedure from 1 again For the initialization of the expansion valve ...

Page 118: ...h the test switch is over turn off the breaker and set the connectors back HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY 1 Connect the large dia pipe side and small dia pipe side service valve using a pipe Parts to be prepared 1 Reducing union 2 8 6 35 mm 3 8 9 52 mm 2 Copper pipe 2 8 and 3 8 Connect the small diameter service valve and the large diameter service valve using the reducing union and...

Page 119: ...14ー1 40 ...

Page 120: ...14ー2 Please set the DIP switch No 6 to ON accordingly Refer to page 59 ...

Page 121: ...14ー3 59 ...

Page 122: ...14ー4 ...

Page 123: ...mission sign lights up with beep from indoor unit simultaneously Beep sound pattern 1 Default setting Short beep NOTE 1 The selected fan speed will remain unchanged after the unit is turned off 2 If Timer reservation has been set it will be canceled 3 During time setting and timer setting this operation cannot be set Fan speed during thermo off Ultra low Set fan speed When auto fan speed is set th...

Page 124: ...ttent Fan Control Change Mode 2 Press ROOM TEMPERATURE setting UP DOWN buttons The intermittent pattern changed with indoor unit beep sound Transmission sign lights up with beep from indoor unit simultaneously Pattern1 Pattern2 Pattern3 NOTE 1 The indication of the selected intermittent pattern will disappear after 10 seconds 2 The selected intermittent pattern will remain unchanged after the unit...

Page 125: ...3 92 92 73 84 75 85 86 8 3 4 5 71 10 12 90 62 62 55 63 77 89 80 46 66 81 49 48 69 82 44 91 87 76 88 62 45 79 PARTS LIST AND DIAGRAM MODEL RAF 25RXB RAF 35RXB RAF 50RXB 54 56 11 64 13 901 52 67 65 23 15 15ー1 ...

Page 126: ...PLATE FILTER UP LEFT FILTER UP RIGHT FILTER LEFT FILTER RIGHT SUC DEFLECTOR MOTOR DEFLECTOR UPPER W LIGHT RECEIVING UNIT GEAR MOTOR CONNECTING ROD SCREW COVER W RAF 25RXB RAF 35RXB RAF 50RXB RAF 50A2 002 RAS N22V 005 RAS E40V2 041 RAF 50A2 028 RAS E40V2 268 RAF 50RXB 916 RAF 35RXB 901 RAS LJ22W 004 RAF 50RXB 903 RAF 50RXB 904 RAF 50RXB 905 RAF 25QXA 903 RAF 50RXB 906 RAS S40C2 036 RAF 50FX8 913 RA...

Page 127: ...MODEL RAC 25FXB RAC 35FXB 1 3 3 44 44 16 2 13 14 15 6 7 24 27 26 22 21 19 38 41 40 39 23 25 43 30 42 36 37 8 10 9 4 31 29 33 28 32 34 45 35 46 17 18 20 5 11 12 47 15ー3 ...

Page 128: ...COVER R TERMINAL COVER TOP COVER SERVICE VALVE COVER BUSH ASSEMBLY BUSH COMPRESSOR RUBBER FUSE 15A FUSE 3 15A VALVE PLATE RAC 25FXB RAC 35FXB HWRAC 25FXB A01 HWRAC 25YH4 A02 HWRAC 25YH4 A04 HWRAC 25FXA A01 HWRAC 25FXB A02 HWRAC 25FXB A03 HWRAC 25FXB A04 HWRAC 25FXB A05 HWRAC 18WSA A09 HWRAC 25FXB A06 HWRAC E08H A05 HWRAC 18WSA A10 HWRAC 18WSA A11 HWRAC D10EX A08 HWRAC 25WX8 A02 HWRAC SX10HAK A20 H...

Page 129: ...MODEL RAC 50FXB 39 40 18 9 6 4 16 17 8 55 7 19 14 15 30 10 11 13 12 35 48 5 20 21 22 25 24 23 29 28 51 26 44 27 36 42 43 49 50 32 37 45 46 56 47 41 34 38 33 31 3 52 53 54 9 15ー5 ...

Page 130: ...FUSE 3 15A SUPPORT P W B O L R COVER FIX PLATE PC SUP VALVE ZA S PIPEAS HWRAC 50WXB A01 HWRAC 50WEA A02 HWRAC 50WEA A03 HWRAC 50NX2 A04 HWRAC 50WXB A02 HWRAC 50FXB A01 HWRAC 50WEA A05 HWRAC 50WEA A06 HWRAC 50NX2 A09 HWRAC 50FXB A02 HWRAC 50FXB A03 HWRAC 50FXB A04 HWRAC 50FXB A05 HWRAC 50WEA A11 HWRAC 50WXB A04 HWRAC 50WXB A28 HWRAC 50NX2 A17 HWRAC SX10HAK A20 HWRAC E08H A09 HWRAC 50WXB A05 HWRAC 1...

Page 131: ...Printed in Japan HRT TC NO 0842E RAF 25RXB RAC 25FXB RAF 35RXB RAC 35FXB RAF 50RXB RAC 50FXB ...

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Hitachi RAC-25FXB, Service Manual

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