Hitachi RAC-25FPA Service Manual Download Page 78

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TROUBLE SHOOTING

MODEL RAC-25FPA, RAC-35FPA

PRECAUTIONS FOR CHECKING

WARNING

Always keep your hands
and metallic things away
from the cabinet.

DANGER!

Don't install
the ground
line.

When using an
oscilloscope, never
ground it.
Don't forget that high
voltage as noted in
the figure above may
apply to the
oscilloscope.

Remember that
voltage of 175 V is
applied to the 0V line
on the P.W.B. or the
like as shown in the
right diagram.

Indoor Controller

Outdoor Controller

Point

375 F

I.P.M.

Compressor
motor

Point

line

Control
P.W.B.

Main

P.W.B.

Voltage at point A

Ground voltage

350V

Point B (0V line)

Power

Summary of Contents for RAC-25FPA

Page 1: ...tachi Household Appliances Wuhu Co Ltd OUTDOOR UNIT RAF 25RPA RAF 35RPA INDOOR UNIT ĆAfter installation 760 600 235 14 760 600 235 14 750 91 Ć 288 47 Ć RAF 25RPA TYPE MODEL POWER SOURCEǂǂ TOTAL INPUT W TOTAL AMPERES A CAPACITY kW h U T B TOTAL INPUT W TOTAL AMPERES A CAPACITY W k h U T B W DIMENSIONS mm ǂ H D g k T H G I E W T E N DC INVERTER ǂǂ 11 942 3 753 14 330 1 050 250 1 800 COOLING HEATING ...

Page 2: ... DANGER 2 ...

Page 3: ... 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 pla...

Page 4: ...rcuits 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 4 ...

Page 5: ...ion 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 the outside temperature is below 10 C 14...

Page 6: ...SFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REFRIGERANT CHARGING VOLUME R410A UNIT PIPES MAX 20m SPECIFICATIONS REMOTE CONTROL SWITCH LIQUID CRYSTAL YES NO RAF 25RPA RAF 35RPA NO NO NO NO YES NO NO NO NO YES IC RAC 25 RAC 35 YES YES 3 15A G4A 1A NO YES NO 450NR WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE NO NO NO 20W DC35V ASD102CK A7JK YES YES IC 1120g FPA FPA 47W DC120 380V MIN 5m 870g 6...

Page 7: ... to ensure ventilation ue Maximum pipe length 20m Minimum pipe length 5m Indoor unit installation Direction of Piping Piping con guration may be in three different directions direct rear piping right downward piping and right sideways piping Above 100mm Above 150mm Above 200mm Procure locally Be sure to completely seal any gap with putty Drain pipe Must be installed separately Insulate indoor part...

Page 8: ...use the high speed fan inside may cause danger s Do not bundle the power cable pull it put something on it heat it process it or put it between things Breakage of the power cable may result Use of a damaged cable may cause an electrical shock or a fire PROHIBITION PROHIBITION 3 WARNING PRECAUTIONS DURING OPERATION s Do not use any conductor as fuse wire this could cause fatal accident PROHIBITION ...

Page 9: ...ts during operation During heating the operation indicator may blink blowing very lightly or totally stopping under the following conditions 1 During preheating heating operation For about 2 3 minutes after start up 2 During defrosting heating operation Defrosting will be performed about once an hour when frost forms on the heat exchanger of the outdoor unit for 5 10 minutes each time If the pipin...

Page 10: ... the room Consult the shop if that is the case ƽ If the remote controller signals happen to operate another appliance move that appliance to somewhere else or consult the service shop ƽ When the remote controller is not in use please close the slide cover to prevent failure 7 PREPARATION BEFORE OPERATION Ƶ To set calendar and clock 1 Press RESET button when first time setting Year blinks 2 Press T...

Page 11: ...lector Button This determines the fan speed Every time you press this button the ange from AUTO HIG H MED LOW SILENT This button allows optimal or preferred fan speed for each operation mode 䇆䇆䇆䇆 airflow rate will ch selection of This indicates the room temperature selected current time timer status function and airflow rate selected mode p 18 9 MODE SELECTOR AUTO HEAT DEHUMIDIFY COOL FAN FAN S...

Page 12: ...atically determine the mode of operation HEAT or COOL depending on the current room temperature The selected mode of operation 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 Ƶ Auto Restart Control ƽ If there is a power failure operation will be automatically restarted when the pow...

Page 13: ...ture fan speed will be changed to lower speed to obtain optimum room temperature condition for natural healthy cooling START STOP 1 3 AUTO HIGH MED LOW SILENT 2 12 DEHUMIDIFYING OPERATION Ƶ Dehumidifying Function ƽ When the room temperature is higher than the temperature setting The device will dehumidify the room reducing the room temperature to the preset level When the room temperature is lower...

Page 14: ... deflectors swinging or in the lower position in the case of vertical auto swing for a long time It may cause dew condensation on the deflectors Press AUTO SWING VERTICAL button The deflector s will start to swing up and down is displayed on the LCD Press AUTO SWING VERTICAL button again The deflector s will stop in the current position disappeared from the LCD ƽ ƽ Vertical When heating about 50 W...

Page 15: ...ed on the LCD POWERFUL operation ends in 20 minutes Then the system automatically operates with the previous settings used before POWERFUL operation Press POWERFUL button again POWERFUL operation stops disappears from the LCD ƽ r O n o t t u b P O T S T R A T S s s e r P ƽ ƽ 17 SILENT OPERATION ƽ By pressing SILENT button during AUTO HEATING DEHUMIDIFYING COOLING or FAN operation the fan speed wil...

Page 16: ... operation days will stop blinking ƽ Press CANCEL button to reset number of operation days or to have continuous operation Ƶ To cancel LEAVE HOME operation ƽ Press START STOP button Or ƽ Press LEAVE HOME button again ƽ Change to other operation mode by pressing MODE button NOTE ƽ After reaching the set number of operation days for Leave Home or by pressing the Leave Home button again ƽ During Leav...

Page 17: ...ƽ 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 ƽ User can set only one of the OFF timer ON timer or ON OFF timer ƽ If WEEKLY TIMER already set by setting the ONCE TIMER ONCE TIMER operation ONCE TIMER operation is complete WEEKLY TIMER operation will ...

Page 18: ...Ƶ To set SLEEP TIMER and ON TIMER The air conditioner will be turned off by ECO SLEEP TIMER and turned on by ON TIMER 1 Set the ON TIMER 2 Press SLEEP button and set ECO SLEEP TIMER Direct the remote controller towards the indoor unit and press CANCEL button ƽ OFF off time number of hour ON and ON TIMER set time disappear from the remote controller display ƽ A beep sound emitted from indoor unit a...

Page 19: ...A or Mode B 2 Set a program 3 Select the desired day of the wekk 25 5 Press ON OFF TIMER button to select ON TIMER or OFF TIMER reservation 6 Press TIME button to set time reservation 7 Press TEMP or button to set temperature reservation 8 Press OK button The reservations are set Day program number ON reservation setting temperature will light up will be continuously blinks If reservation is not c...

Page 20: ...n for activation ƽ After auto restart WEEKLY TIMER operation is cancelled Need to set WEEKLY TIMER operation for activation 1 2 1 WEEKLY TIMER OPERATION Step 2 Select Mode A or Mode B and activate or deactivate WEEKLY TIMER 3 27 Ƶ How to copy and paste Editing the reservation schedule is easy by copying data from one day to another day 1 Press WEEKLY button to select Mode A or Mode B 2 Press WEEKL...

Page 21: ...o start editing the reservation schedule 3 Press DAY button to select a day of the week to edit 4 Press DELETE button for about 10 seconds Reservations for all program numbers will be deleted ƽ If press for a short time reservation for one program number will be deleted 5 After deleting press SEND button while directing the remote controller towards the indoor unit for about 3 seconds Timer lamp o...

Page 22: ... the receiver of indoor unit within 2 31 OPERATION MODE LOCK The remote controller can be set to fix the HEATING mode including FAN COOLING mode including FAN and DEHUMIDIFYING mode including FAN operations Ƶ Method to lock HEATING mode including FAN operation Press ECO and POWERFUL buttons simultaneously for about 5 seconds when remote controller is OFF and will be displayed for about 10 seconds ...

Page 23: ... SWITCH 1 AIR FILTER Clean the air filter as it removes dust inside the room Be sure to clean the filter once every two weeks so as not to consume electricity unnecessarily PROCEDURE MAINTENANCE Open the front panel s To open the front panel use the remote controller to stop unit operation Then press at the top left and right corners of the front panel s Grasp the left and right sides of the front...

Page 24: ... using a soft sponge s When the air conditioner is to be cleaned without removing the front panel clean both the body and remote controller with a dry soft cloth s Wipe off water completely If water remains on the display section or light receiver section this could cause a malfunction CAUTION s Do not splash or direct water to the body of the unit when cleaning it as this may cause short circuit ...

Page 25: ... i M n o i s s i m e t s i M During heating the operation indicator blinks and air blow stops If the remote controller is not transmitting a signal Remote controller display is dim or blank 35 Heating Capability s This room air conditioner utilizes a heat pump system that absorbs exterior heat and brings it into a room to be heated As the ambient temperature gets lower heating capability will also...

Page 26: ...table s Foreign matter or water accidentally enters the unit interior s The power cord gets excessively hot or its insulation is torn or stripped s 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 s Please contact your sales agent immediately if the air conditioner still...

Page 27: ...llation make sure that the infrared receiver and indicator are not blocked 5 Pipes can be laid out from the right bottom or rear when the unit is viewed from front 6 Keep the clearance shown by for installation 7 For built in installation keep the vertical deflector at top air outlet as flat as possible If it is inclined too much heat will be trapped in the unit which could cause faulty room tempe...

Page 28: ... anchor bolt 2 φ12 16 slots for φ8 0 bolt Handle 202 335 288 27 5 19 5 10 91 548 528 5 19 5 162 5 50 Air outlet Rear side Air suction Unit mm More than 200 28 NOTE 1 For outdoor unit installation allow at least 2 sides of space around the unit ensure ventilation 2 The connecting pipe should all the insulated with insulation pipe 3 Piping length is within 20m 4 Height d fferent of the piping betwee...

Page 29: ...BLUE YEL YELLOW BRN BROWN WHT WHITE GRY GRAY ORN ORANGE GRN GREEN RED RED BLK BLACK PNK PINK VIO VIOLET 15 0 23 3 23 0 31 3 31 0 24 7 25 3 32 7 33 3 M WHT RED YEL 0 5V 0V 35V 5V BLU BLK 25W 47W 16 7 1 RAF 25RPA RAF 35RPA RAF 35 AF 35 RAC 35FPA 120 380V BLK 0V WHT 15V M RED RPA THERMOSTAT Room temperature Thermistor FG MAIN ELECTRIC COMPONENTS FOR OUTDOOR UNIT S L E D O M E L B A C I L P P A G N I ...

Page 30: ... 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 DC 220 350 V U V W M M M WHITE RED 5RS102ZBC21 YELLOW 30 WHITE U RED W YELLOW V ...

Page 31: ...ǂ RAF 25RPA RAC 25FPA ǂ OUTDOOR UNIT RAF 35RPA RAC 35FPA 9 CAUTION The marked parts are very important ones for safety NOTE 1 Connecting cable 1 5mm dia x2 C D line is used for the connection 31 ...

Page 32: ...WIRING DIAGRAM OF THE PRINTED WIRING BOARD Remote controller RAR 5E2 32 ...

Page 33: ...MODEL RAF 25RPA RAC 35RPA 33 ...

Page 34: ...MODEL RAC 25FPA RAC 35FPA 34 ...

Page 35: ...tting circuit Reset circuit Temporary switch Wireless remote control C D C D Outdoor microcomputer AX 12C820 OUTDOOR UNIT POWER RELAY Inrush current Protection circuit HARMONICS IMPROVEMENT CIRCUIT IPM Rotor magnetic pole position detection circuit lp ld ls Overheat thermistor Defrost thermistor Outdoor temperature thermistor Indoor Outdoor interface circuit Reversing valve coil Power circuit Rese...

Page 36: ...t Lo or Stop depending on the room temperature and time Set to Stop if the room temperature is 18 in the Silent mode other than during preheating cooling is recovered at 18 33 The fan speed is controlled by the heat exchanger temperature the overload control is executed as in the following diagram Heat exchanger temperature KAFON KAFOF Med with overload Lo On On Off Set to Silent Lo Med Hi ultra H...

Page 37: ...SHIFTW 0 33 0 33 SFTSZW 0 33 0 33 SFTOYW1 0 66 0 66 SHIFTC SHIFTD CMNLMT 2000 min 1 min 1 TEION 2 00 2 00 TEIOF 9 00 9 00 DFTIM COL 35 min 35 min DFTIM FST 43 min 43 min DFTIM OTP0 43 min 43 min DFTIM OTP5 50 min 50 min DFTIM OTP10 50 min 50 min TDF411 40 sec 60 sec TDF412 20 sec sec TDF413 sec 60 sec DFRPM3 2200 min 1 min 1 STARCPDL 2000 min 1 min 1 STARCPDH 2000 min 1 2000 min 1 STARCPD2 200 min...

Page 38: ...d Med fan mode and v change operation mode 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 ...

Page 39: ...39 ...

Page 40: ...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 41: ...41 ...

Page 42: ...maintain for 120 minutes if indoor temperature is higher than 18 C No time limit constrain if indoor temperature is lower than 18 C and outdoor temperature is lower than 2 C 6 During Hotkeep or Defrost mode indoor operation lamp will blink at interval of 3 seconds ON and 0 5 second OFF 7 When heating mode starts it will enter into Hotkeep mode if indoor heat exchanger temperature is lower than YNE...

Page 43: ... 1 The first inhibit time after operation start is set to DFTIM_FST 2 From the second time onwards the inhibit time is set according to the time required for defrosting Reverse cycle operation time DEFCOL DEFTIM_COL is set Reverse cycle operation time DEFCOL The time corresponding to outdoor tempera ture is set 43 ...

Page 44: ...44 ...

Page 45: ...fan Cooling 0 66ć Dehumidifying 0 66ć Heating 0 66ć Set temperature Current restrict Compressor speed Notes 8 WUD L L 0HG RZ 6LOHQW 8OWUD R Can t set POWERFUL and ECO at the same time During FAN operation can t set ECO SILENT Notes Can t set POWERFUL and SILENT at the same time 45 ...

Page 46: ...RAF 25RPA RAC 25FPA COOLING CYCLE INDOOR UNIT OUTDOOR UNIT HEATING CYCLE INDOOR UNIT OUTDOOR UNIT 46 ...

Page 47: ...RAF 35RPA RAC 35FPA COOLING CYCLE INDOOR UNIT OUTDOOR UNIT HEATING CYCLE INDOOR UNIT OUTDOOR UNIT 47 ...

Page 48: ...WKH ILOWHUV XVLQJ D YDFXXP FOHDQHU IWHU XVLQJ QHXWUDO GHWHUJHQW ZDVK ZLWK FOHDQ ZDWHU DQG GU LQ VKDGH WWDFK WKH ILOWHUV ORVH WKH IURQW SDQHO 7R FORVH WKH IURQW SDQHO SUHVV WKH XSSHU FHQWHU SDUW RI WKH IURQW SDQHO 3UHVV DW WKH WRS OHIW DQG ULJKW FRUQHUV RI WKH IURQW SDQHO 5HPRYLQJ 3UHVV DW WKH WRS OHIW DQG ULJKW FRUQHUV RI WKH IURQW SDQHO 2 72 167 1 5 029 7 5217 3 1 H VXUH WR XVH ERWK KDQGV WR JUDV...

Page 49: ...YHU IROORZ WKH DERYH SURFHGXUH LQ UHYHUVH RUGHU 0DNH VXUH WKH KRRNV DW WKH IURQW FRYHU WRS VXUIDFH DUH VHFXUHO LQVHUWHG LQWR WKH FDELQHW 5HPRYH WKH IURQW SDQHO 5HPRYH WKH IURQW FRYHU 5HPRYH WKH ERWWRP VFUHZV DQG WRS VFUHZV 3XOO WKH IURQW FRYHU DSSUR LPDWHO PP WRZDUG RX 49 ...

Page 50: ... 7 1 3 5HPRYH WKH IURQW SDQHO DQG WKH IURQW FRYHU 5HPRYH WKH LQGLFDWLQJ 3 FDVH 6 5 5 0 5HPRYH WKH IURQW SDQHO DQG WKH IURQW FRYHU 5HPRYH WKH IL LQJ VFUHZV RI WKH GLVFKDUJH IUDPH DQG WKHQ SXOO RXW WKH GLVFKDUJH IUDPH WRZDUG RX 50 ...

Page 51: ... 75 3 576 6 5HPRYH WKH IURQW SDQHO DQG WKH IURQW FRYHU 5HPRYH WKH IL LQJ VFUHZV RI WKH HOHFWULFDO SDUWV FDVH 6FUHZ 6FUHZ OHFWULFDO SDUWV FDVH 51 ...

Page 52: ... DUH WKH IL DWLRQ RI HYDSRUDWRU DUH UHPRYHG 7KH WDE ZKHUH WKH OHIW VLGH RI HYDSRUDWRU LV IL HG LV UHPRYHG YDSRUDWRU LV OLIWHG XS DQG UHPRYHG 7ZR VFUHZV WKDW LV WKH IL DWLRQ RI IDQ PRWRU VXSSRUW LV UHPRYHG DQG IDQ PRWRU VXSSRUW LV UHPRYHG 7KH WDQJHQWLDO DLU IORZ IDQ DQG IDQ PRWRU DUH IL HG ZLWK VFUHZ 3OHDVH ORRVHQ VFUHZ ZKHQ RX UHPRYH 52 ...

Page 53: ... 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 08A392_12_RAS_35FH6_83 92_E MODEL RAC 25 35FPA 53 ...

Page 54: ...ated using three terminal regulator IC121 1 Power circuit DESCRIPTION OF MAIN CIRCUIT OPERATION RAF 25RPA RAF 35RPA C133 Q111 R114 Q113 Q112 R111 R115 C113 C116 R112 ZD111 R116 R117 C111 Q116 R124 R121 R122 R123 Q115 C112 IC111 8 L751 R631 L752 R752 C132 ZD131 M CN10 1 2 3 4 5 6 C131 C751 C621 R751 Motor Indoor Fan IN OUT GND D121 0V ZD121 R118 C103 35V 35V 0V ICP2 C115 L111 C114 D111 R119 ICP1 C1...

Page 55: ... 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 IC521 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 ...

Page 56: ... motor as instruction voltage number of rotations The relationship between the voltage of point and number of rotations becomes as shown in Fig 3 The gap may arise depending on the condition of unit The feedback pulse of number of rotation is outputted from the fan motor and input to micro computer pin 68 The frequency of this pulse is 12 60 of the number of rotations Ex 1000min 1 12 60 200Hz The ...

Page 57: ...IFIES AND SHAPES THE SIGNAL AND OUTPUTS IT 7 2 33 INPUT ICROCOMPUTER R6 2 6 6 6OUT 6OO GND 66 6 1 2 2 UZZER IRCUIT 2ECEIVE IRCUIT 57 When the buzzer sounds an approx 3 9kHz square signal is output from buzzer output pin 83 of the micro computer After the amplitude of this signal has been set to 12Vp p by a transistor it is applied to the buzzer The piezoelectric element in the buzzer oscillates to...

Page 58: ... R734 54 5V 6 Initial Setting Circuit IC401 7 Temporary Switch Circuit R301 5V R305 C302 90 1 2 3 4 5 0 0 10 20 30 40 8 Room Temperature Thermistor Circuit A room temperature thermistor circuit is shown in Fig 8 1 According to room temperature the voltage of point becomes as it is shown in Fig 8 2 Microcomputer Room Temperature Thermistor Voltage of point V Room temperature Room temperature input ...

Page 59: ...10 10 10 10 R921 R924 R642 R544 R542 R610 R922 DSW1 DSW1 R923 R541 R543 100 59 ...

Page 60: ...１５ＡＦＵＳＥＶＳ１Ｒ００３ＡＢＲＥＡＣＴＯＲＴＡＢ３１３ｍＨ１０Ａ２５５ｍＨ５Ａ２５０２５０ＶＳ２Ｌ００１ＳＡ１Ｃ０１３Ｃ０１４Ｃ０１２Ｌ００２ＩｎｒｕｓｈｃｕｒｒｅｎｔｒｅｌａｙＰｏｗｅｒｒｅｌａｙＣ０１１ＪＷ００１ＤＢ６０２ＤＢ６０１Ｒ６０３３１５ＡＦＵＳＥＲ００７ＲＬ１ＲＬ２ＤＢ１ＢＬＵＥＢＬＵＥ２０ｍｍ２０ｍｍ０５ｍｍ０５ｍｍ０５ｍｍＷＨ００２ＷＨ００４ＷＪ３ＧＲＮＢＧＲＮＡＢＲＮＡＢＲＮＢＷＪ...

Page 61: ...oltage Together with suppressing the electrical noise generated at the time of compressor operation the external noise entering via the power supply line is absorbed as well protecting the electronic parts of the system 5 SA1 VS1 VS2 VS5 This operates to suppress external surges from indirect lightning etc This smoothes the voltage rectified for operating the compressor When the input voltage is t...

Page 62: ...is found in this step the power circuit is normal Check the removed loads If any error is found in this step the power circuit has any failure Replace the power circuit for P W B A short circuited load may cause an output error not only in the load but also in the others Be sure to check all outputs of the loads Be sure to wait 15 minutes or more in order to discharge all the remaining voltage in ...

Page 63: ...gnal while it is outputting a request signal The receiving circuit in the indoor unit consists of a comparator and transistor The interface signal from the outdoor unit on the DC 35V line is supplied to C321 where DC components are eliminated and isthen shaped by the comparator The shaped signal is detected by diode amplified by amp and output to pin 51 of the indoor microcomputer Fig 3 2 shows th...

Page 64: ...0 R327 D321 R320 IC301 2 2 IC301 1 2 R328 R329 5V R336 R334 C324 6 5 7 3 8 4 2 1 R321 C321 C332 L301 CJ301 C333 C334 C335 0V R335 5V R332 R333 Q334 IF Transmission IF Reception Ｌ８０２Ｌ００３Ｃ８０３０ＶＤ８０１１２ＶＣ８０４Ｃ８０５Ｃ８０６Ｌ８０１Ｃ８０８Ｃ８０９Ｃ８１０Ｃ８０１Ｒ８０２Ｑ８０１Ｒ８０３０ＶＣ８１１５ＶＲ８０４ＲＬ３Ｃ８０２Ｒ８０１Ｌ８０３Ｌ８０４０Ｖ３５Ｖ５Ｖ２３Ｌ８１０Ｒ８０ ...

Page 65: ...tdoor Microcomputers Outdoor to Indoor Communications Fig 3 3 Voltages Waveforms of indoor Outdoor Microcomputers Indoor to Outdoor Communications Pin Indoor microcomputer Pin Pin 35V DC line Outdoor microcomputer Pin Pin Indoor microcomputer Pin Pin 35V DC line 0V 5V 0V 0V 35V 44 44 62 52 51 62 52 51 65 ...

Page 66: ...ne voltage reaches 10 9V an reset voltage input to pin of microcomputer is set to Hi Reset voltage will be hold Hi until the 12V line voltage drops to 9 90V even though the power shuts down Fig 4 1 Fig 4 2 12V line Power is ON Voltage V Power is OFF Voltage V 5V line 10 9V Time Time 9 9V Reset voltage Reset voltage 12V line 5V line 12 6 0 12 6 0 １２ＶＣ２８１０ＶＩＣ５２２Ｒ２８５Ｒ２８２Ｃ２８２ ...

Page 67: ...puter transfers the defrosting condition command to the indoor microcomputer via the circuit interface The microcomputer always reads the outdoor temperature via a thermistor microcomputer pin an transfers it to the indoor unit thus controlling the compressor rotation speed according to the value set at the EEPROM in the indoor unit and switching the operation status outdoor fan on off etc in the ...

Page 68: ...mately as shown in Table 6 1 when measured by multimeter Operation condition Collector voltage of D401 Cooling General operation of Cooling In normal heating operation Defrosting Sensor dry MAX rotation speed instructed by indoor microcomputer after defrost is completed Heating Dehumidifying About 35V About 35V About 35V About 0V About 0V Table 6 1 ＲＬ５４３２１ REVERSING VALVE Ｄ４０１ＣＮ２ＲＬ５...

Page 69: ...n of the CN15 to with a multimeter If no change is found around 0 9 V or 12V in this step the expansion valve or the microcomputer has failure The logic waveform during the operating of the expansion valve is shown in Fig 7 2 7 Electric expansion valve control circuit 1 2 3 4 5 6 7 8 VALVE CLOSE 8 7 6 5 4 3 2 1 VALVE OPEN 12V 0 9V 50ms 75ms 200ms 1 ON OFF OFF OFF 2 ON ON OFF OFF 3 OFF ON OFF OFF 4...

Page 70: ...RRENT Id The external fan motor is controlled by the outdoor microcomputer This outdoor fan motor estimates the actual speed based on the DC current flowing to R741 it then adjusts this value as necessary so that it becomes the speed corresponding to the operation command transmitted from the indoor unit In addition overcurrent detection and other fault detection is performed based on the DC curre...

Page 71: ...g inside of outdoor unit by snowing It may make Fan Lock Stop by strong wind ex 17m sec or above against the Fan rotation In this case unit will be restart again after a while In case of Fan Lock Stop even though the DC Fan Motor is rotating correctly the possible cause in Fan Motor problem or control board problem Stop after the Fan motor runs 2 minutes Fan Motor may be broken Caution Please take...

Page 72: ...uit U is ON V is ON 9 Intelligent power module circuit IPM circuit Fig 9 1 shows peripheral circuits of intelligent power module IPM In the diagram U V and W are called the upper arm U V and W the lower arm L004 C600 R603 R008 C031 72 ...

Page 73: ...lled to ON OFF by 2 5kHz 5kHz chopper signal Rotation speed of the compressor is proportional to duty ratio ON time ON time OFF time of this chopper signal Time T in Fig 9 2 shows the switching period and relation with rotation speed N of the compressor is shown by formula below N 60 2 X 1 T Fig 9 3 shows voltage waveform at each point shown in Figs 9 1 and 9 4 First half of upper arm is chopper s...

Page 74: ...B becomes intermittent waveform as shown in Fig 3 Since current at point B is approximately proportional to the input current of the air conditioner input current is controlled by using DC current Id detection resistor Reference If power module is defected self diagnosis lamps on the MAIN P W B may indicate as shown below Table 9 1 Fig 9 5 9 R008 C031 74 ...

Page 75: ...ng the fan speed remains LOW for 30 seconds If HIGH is elected it switches to LOW and again to MED after additional 30 seconds Heating operation stops while the temperature is preset at 30 If temperature is high in the outdoor heating operation may stop to protect internal devices Normal sound when refrigerant flows in pipe To improve the dehumidification efficiency performs quiet fan operation Th...

Page 76: ...76 When does Nice temperature reservation Q4 A4 not work In case of weekly timer operation has been preset Nice temperature reservation not work ...

Page 77: ... 3 3 1 77 ...

Page 78: ...oscilloscope never ground it Don t forget that high voltage as noted in the figure above may apply to the oscilloscope Remember that voltage of 175 V is applied to the 0V line on the P W B or the like as shown in the right diagram Indoor Controller Outdoor Controller Point 375 F I P M Compressor motor Point line Control P W B Main P W B Voltage at point A Ground voltage 350V Point B 0V line Power ...

Page 79: ...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 capacitor ＷＨＴ ...

Page 80: ... If tester probe etc touches gate G gate drive circuit and 0V line Q111 will be turned on continuously over current will flow and ICP1 may be blown causing trouble in Q111 When switching waveform of Q111 is to be observed measure gate G and drain D with source S as base point 2 CN3 Power CN10 Fan Motor are connectors with lock mechanism Release lock with finger before disconnecting 3 Do not touch ...

Page 81: ...0 35 sec at interval of 0 35 sec When the timer lamp on the display section of the indoor unit blinks refer to the following table Lamp blinking mode Main defective Reversing valve defective Forced operation of outdoor unit Indoor Outdoor interface defective Outdoor defective indication Indoor sensor defective IC401 defective Abnormal rotating numbers of DC fan motor Interface voltage error 3 Time...

Page 82: ...SELF DIAGNOSIS LIGHTING MODE MODEL RAC 25 A RAC 35 A FP FP 82 ...

Page 83: ...ke note that this function may not work when not following the above procedures If it does not work switch OFF the power and try again If nothing is stored in the memory the lamp does not blink even if re indication operation is carried out After carrying out re indication operation the remote controller operation will not be accepted once the data has been cleared To carry out normal operation sw...

Page 84: ... Error code 05 Outdoor error 01 OH thermistor temperature rise When reading diagnosis memory only Error code 06 Outdoor error 01 Abnormal outdoor thermistor Error code 07 Outdoor error 01 Acceleration defective Error code 08 Outdoor error 01 Communication error When reading diagnosis memory only Error code 09 Outdoor error 01 Abnormal power source When reading diagnosis memory only Error code 10 O...

Page 85: ...s 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 of the...

Page 86: ...ck 3 Is the compressor of the outdoor unit running Yes No If you responded No to Check 2 ǂǂǂCheck 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 ǂǂǂǂǂC...

Page 87: ...rder Before work check the power supply voltage An abnormal voltage may be being supplied in some rare occasions due to a defect in the indoor wiring a wire break in the neutral wire of the single 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 hi...

Page 88: ...truct 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 switch af...

Page 89: ... 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 hard...

Page 90: ...ses 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 for t...

Page 91: ...imer lamp orange 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 Di...

Page 92: ...ocations Indoor fan motor Fan motor drive circuit Diagnosis flow Initiating troubleshooting Yes Replace the indoor fan motor No Replace the indoor electrical unit Run the product by remote control and then stop it Reproduce the failure phenomenon Is the voltage between pins connector CN10 below 1 1 V Take measurements while the failure phenomenon is present 2 and 4 of the fan motor 92 ...

Page 93: ...nal board temperature fuse ensure that the F cable to be inserted into the terminal board has the appropriate dimension for peeling the insulation sheathing and that the insertion region is unbent before inserting it into the terminal board securely 6 Timer lamp blinking blinking twice 7 Timer lamp blinking blinking three times Situation This is not a sign of a breakdown The timer lamp blinks one ...

Page 94: ...ks 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 con...

Page 95: ...flow Initiating troubleshooting No No No No No No No s e Y s e Y Yes Yes s e Y s e Y Yes Remove the cause of the mechanical lock Is the indoor fan motor connector CN10 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 voltage of about 1 7 3 8V occur between pins and Replace the indoor electrical unit Replace the in...

Page 96: ...roubleshooting Is the F cable connection free from errors Yes Yes Yes Yes No No No No Correct the F cable connection Is the CN30 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 A and B of the terminal board of the electrical parts of the outdoor unit subjected to 220 230V AC Take measurements ...

Page 97: ... any P W B disconnect all the cables including ground wires Removing the P W B s Fig A Open these support latches to remove the P W B Screw Cooling fins Earth screw Remove the earth screw from the electrical box Lead wire Remove screws fastening the lead wires which are connected to the terminal board and remove the lead wires from the terminal board Terminal board 3 4 Open these support latches t...

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Page 102: ...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 mode Blinks 2 times Blinks 3 times B...

Page 103: ...ay also be defective Replace defective parts Is the power circuit normal See the description on power circuit for details Is the switching power circuit OK Has the 3 15A fuse blown Check to see if C and D cables are connected correctly If reversed or incompletely inserted correct the cable connection Replace any defective parts If the 3 15A fuse has blown the varistor etc may also be defective Wit...

Page 104: ...ormal Are there no abnormalities related to fuses and other protection parts Adjust the input voltage to 220 to 230 V and restart Was the operation normal Replace the main P W B No No Yes No No Yes Yes Yes No LD301 blinks 13 times EEPROM error Replace the main P W B 104 ...

Page 105: ...the 2A fuse blown Is 16V being generated Check voltage both between CN18 and on the main P W B If no output voltage is present on the main P W B replace the main P W B Connect the connector Remove any obstructions Replace the fan motor and main P W B Yes No No No Yes No No Yes Yes Yes 105 ...

Page 106: ...operly Connect properly Replace the fan motor Replace the main P W B Possible causes include Power relay malfunction Defective microcomputer Yes Yes Yes Yes Yes No No No No No LD 301 blinks 11 times Outdoor fan error Is there a strong wind Confirm if restart is performed Operate after restart Stop Check the outdoor fan motor For details refer to the page about the outdoor fan motor Is there an abn...

Page 107: ...the indoor timer lamp blinks Check the indoor electrical parts Emplace the outdoor electrical parts in the case of an abnormality in the communication correction after a self check Is the connector CN30 securely inserted You may have forgotten to make the Insert the connector CN30 and condct a double check circuit Blinks 3 times Blinks 12 times pull out CN30 Normal 107 ...

Page 108: ... the thermistor connector disconnected The problem may be forgetting to connect after servicing Is the continuity of the thermistor normal Connect the thermistor Replace the thermistor Replace parts in the Yes Yes Yes No No No control P W B 108 ...

Page 109: ... 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 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 The LD301 blinks 6 times OH thermistor heat up The LD301 blinks ...

Page 110: ...resets and stops just after power is supplied this does not indicate a fault Is the reset circuit normal Normally pin of CN18 is approx 5V Replace the main P W B Make sure again that connectors are connected securely Perform final operation check Yes No 110 ...

Page 111: ...HE TEST SWITCH THE OUTDOOR UNIT Be sure to push the test switch for a second again to stop the forced cool operation 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 cop...

Page 112: ...g mode of the self diagnosis lamp Mounting location of the self diagnosis lamp When you start the selfcheck please confirm that the pin 25 pin 33 do not short with the pin 26 pin 29 pin 32 of the IPM WARNING 112 ...

Page 113: ...38 39 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAF 25 35RPA 113 ...

Page 114: ...114 HWRAF 50NX2 A14 HBOARD AS ...

Page 115: ... 1 4 2 17 14 18 12 15 10 6 16 46 33 45 7 8 13 3 22 9 27 30 29 25 24 23 21 19 20 41 44 43 38 36 37 34 42 35 31 32 26 28 39 40 OUTDOOR UNIT MODEL RAC 25 35FPA 115 ...

Page 116: ...4 4 614 18 4 5 4 1 6 4 5 4 1 6 4 5 5 5 1 0 1614 9 MI 5 2412 4 0 5 076 2412 4 0 5 5 18 4 5 0 5 4106 18 4 5 5 4 4 5 64 2 465 2 6 5 64 2 465 18 4 5 2 2 0 4 5 6 4 0 1 4 2 5 6 5 0 4 74 614 5 3 5 3 5 5722146 2 9 5 5 7 5 18 4 176 114 6 4 5614 5 6 4 5614 176 114 6 2 4 674 5 5 18 4 4 5 6 4 0 18 4 5 4 8 1 2 1 6 5 5 48 8 8 18 4 5 75 55 5 5 7 6 4 1 2 2 7 5 4 1 6 1 0 2 9 219 4 2 465 0 01 3 6 70 6 9 2 465 01 0 ...

Page 117: ...RAF 25RPA RAC 25FPA RAF 35RPA RAC 35FPA HHAW NO 0069E 117 2 ...

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Summary of Contents for RAC-25FPA

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Hitachi RAC-25FPA, Service Manual, Page: 78 / 117

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Summary of Contents for RAC-25FPA

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