Hitachi RAC-18WSPA Service Manual Download Page 1

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SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

ROOM AIR CONDITIONER

INDOOR UNIT + OUTDOOR UNIT

SERVICE MANUAL

REFER TO THE FOUNDATION MANUAL

TECHNICAL INFORMATION

FOR SERVICE PERSONNEL ONLY

SPECIFICATIONS

CONTENTS

SPECIFICATIONS ------------------------------------------------------------------- 6

HOW TO USE ---------------------------------------------------------------------- 8

CONSTRUCTION AND DIMENSIONAL DIAGRAM --------------------- 27

MAIN PARTS COMPONENT --------------------------------------------------- 29

WIRING DIAGRAM ---------------------------------------------------------------- 31

CIRCUIT DIAGRAM --------------------------------------------------------------- 33

After installation

BLOCK DIAGRAM ----------------------------------------------------------------- 35

BASIC MODE ----------------------------------------------------------------------- 36

REFRIGERATING CYCLE DIAGRAM --------------------------------------- 46

--------------------------------------

DESCRIPTION OF MAIN CIRCUIT OPERATION ----------------------- 49

SERVICE CALL Q & A ---------------------------------------------------------- 66

TROUBLE SHOOTING ----------------------------------------------------------- 69

Procedure for Disassembly and Reassembly

PARTS LIST AND DIAGRAM --------------------------------------------------97

HHAW

RAS_AW_000covere

INDOOR UNIT

OUTDOOR UNIT

INDOOR UNIT

RAK-18PSPA

880)

(KW)

(B.T.U./h)

(KW)

(B.T.U./h)

780

792

780

792

780

792

280

600

280

600

280

600

218

299

218

299

218

299

8.0

MODEL

POWER SOURCE

TOTAL INPUT (W

TOTAL AMPERES (A)

CAPACITY

COOLING

HEATING

TOTAL INPUT (W

TOTAL AMPERES (A)

CAPACITY

845 (70

1350)

DIMENSIONS
(mm)

1.70-1.70

1.80 (0.50 2.80)

6,120 (1,700 9,520)

375 (65

1,620)

2.30 (0.60 4.80)

2.10-2.00

7,820 (2,040 16,320)

585 (65

2,250)

NET WEIGHT (Kg)

TYPE

DC INVERTER

1 PHASE,50HZ,220-230V

300 (

490(70

960)

3.10-3.00

3.20 (0.60 5.80)

10,880 (2,040 19,720)

4.30-4.20

830 (65

2,450

4.30-4.10

13,600 (2,040 22,440)

2.70-2.60

2.50 (0.50 3.40)

8,500 (1,700 11,560)

3.50 (0.50 4.10)

11,900 (1,700 13,940)

4.00 (0.60 6.60)

JULY 2013

Hitachi Household Appliances(Wuhu) Co., Ltd.

RAK-18PSPA/RAC-18WSPA
RAK-25PSPA/RAC-25WSPA
RAK-35PSPA/RAC-35WSPA

RAK-35PSPA

RAK-25PSPA

RAK-18PSPA

RAC-18WSPA
RAC-25WSPA
RAC-35WSPA

RAK-35PSPA

RAC-35WSPA

RAC-18WSPA

RAK-25PSPA

RAC-25WSPA

OUTDOOR UNIT

INDOOR UNIT

OUTDOOR UNIT

0073

Summary of Contents for RAC-18WSPA

Page 1: ...00 280 600 D 218 299 218 299 218 299 8 0 44 8 0 44 8 0 44 MODEL POWER SOURCE TOTAL INPUT W TOTAL AMPERES A CAPACITY COOLING HEATING TOTAL INPUT W TOTAL AMPERES A CAPACITY 845 70 1350 DIMENSIONS mm 1 70 1 70 1 80 0 50 2 80 6 120 1 700 9 520 375 65 1 620 2 30 0 60 4 80 2 10 2 00 7 820 2 040 16 320 585 65 2 250 NET WEIGHT Kg TYPE DC INVERTER 1 PHASE 50HZ 220 230V 1 PHASE 50HZ 220 230V 1 PHASE 50HZ 22...

Page 2: ... DANGER ...

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: ...asion 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 ...

Page 6: ...ARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL NO NO NO YES YES 3 15A G4A 1A NO NO YES NO NO 450NR NO WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE UNIT PIPES MAX 20m REFRIGERANT CHARGING VOLUME Refrigerant 410A RAC 18WSPA RAC 35 SPA NO NO NO NO NO NO NO YES NO NO NO NO YES IC YES RAS_AW_001 014en 1350g 1330g RAK 18PSPA RAC 25WSPA RAK 25PSPA RAK 35PSPA W MIN 5m 25W D...

Page 7: ...or unit should be kept below 10m s The connecting pipe no matter big or small should all be insulated with insulation pipe and then wrapped with vinyl tape The insulator will deteriorate if it is not wrapped with tape The connection of insulated drain hose Inner diameter 16mm Please use insulated drain hose for the indoor piping commercial product above 100mm above 200mm above 50mm give clearance ...

Page 8: ...igh speed fan inside may cause danger 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 2 Make sure to connect earth line This sign in the figure indicates prohibition Indicates the instructions that must be followed WARNI...

Page 9: ... down s In heating operation condensate or water due to defrosting will flow Do not cover the drain port of the outdoor unit because such water may freeze in the chilly area 7 0325 5 6 7 4 RAC 25WSPA RAC 35WSPA Refer page 7 NAMES AND FUNCTIONS OF EACH PART INDOOR UNIT INDICATIONS TIMER LAMP Orange This lamp lights when the timer is working OPERATION LAMP Yellow This lamp lights during operation Th...

Page 10: ...move the front panel and wash with clean water Wash it with a soft sponge After using neutral detergent wash thoroughly with clean water s When front panel is not removed wipe it with a soft dry cloth Wipe the remote controller thoroughly with a soft dry cloth s Wipe the water thoroughly If water remains at indicators or signal receiver of indoor unit it causes trouble Method of removing the front...

Page 11: ... become unstable It could collapse or fall causing injury WHEN ASKING FOR SERVICE CHECK THE FOLLOWING POINTS CONDITION CHECK THE FOLLOWING POINTS s Do the batteries need replacement s Is the polarity of the inserted batteries correct s Is the fuse all right s Is the voltage extremely high or low s Is the circuit breaker ON s Is the power plug inserted s Do you have any power cut s Is the air filte...

Page 12: ...ccording to room temperature changes Mist is generated as the air within the room is suddenly cooled by conditioned air Water generated during defrosting operation evaporates and steam is emitted Caused as the smells and particles of smoke food cosmetics etc present in room air become attached the unit and blown off into the room again Defrosting is underway as the heating operation is stopped the...

Page 13: ...me type and replace both old batteries together ƽ When the system is not used for a long time take the batteries out ƽ The 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 ƽ The attached batteries are provided for the initial use o...

Page 14: ...ion sign The transmission sign lights up when a signal is sent FAN SPEED selector 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 ...

Page 15: ...he TEMPERATURE buttons the display indicates the setting The temperature setting and the actual room temperature may vary depending on conditions START STOP 1 3 2 Set the desired FAN SPEED with the FAN SPEED button the display indicates the setting AUTO HIGH MED LOW SILENT Ƶ As the settings are stored in the memory the remote controller you START STOP button next time only have to press the of 5 E...

Page 16: ...he heating function may not work in order to protect the device ƽ Press the MODE selector button so that the display indicates HEAT Set the desired FAN SPEED with the FAN SPEED button the display indicates the setting Set the desired room temperature with the TEMPERATURE buttons the display indicates the setting The temperature setting and the actual room temperature may vary depending on conditio...

Page 17: ...y indicates the setting The temperature setting and the actual room temperature may vary depending on conditions Press the START STOP button Cooling operation starts with a beep Press the button again to stop operation The cooling function does not start if the temperature setting is higher than the current room temperature even though the OPERATION lamp lights The cooling function will start as s...

Page 18: ...e 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 11 ENGLISH AUTO SWING OPERATION Ƶ To start Vertical Auto Swing Ƶ To cancel Vertical Auto Swing NOTE ƽ During cooling and dehumidifyi...

Page 19: ...omatically However effectiveness of ECO depends on operation conditions ECO operation is an energy saving function by changing set temperature automatically and by limiting the ma x imum power consumption value ƽ 13 ENGLISH SILENT OPERATION ƽ By pressing SILENT button during AUTO HEATING DEHUMIDIFYING COOLING or FAN operation the fan speed will change to ultra slow Ƶ To start SILENT operation Ƶ To...

Page 20: ...king 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 Leave Home operation fan speed and...

Page 21: ...it and the TIMER lamp on the indoor unit lights up ON TIMER 1 Press ON TIMER button and blink on the display 2 Set the turn on time with TIME button 3 After setting direct the remote controller towards the indoor and press SEND button and set time light up instead of blinking A beep sound emitted from indoor unit and the TIMER lamp on the indoor unit lights up ON OFF TIMER ƽ The device will turn o...

Page 22: ...t operate correctly ƽ Reservation for calendar and clock shall be set rst before operating WEEKLY TIMER fi How to set a WEEKLY TIMER 1 Select Mode A or Mode B 2 Set a program 3 Select the desired day of the wekk 19 ENGLISH 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 T...

Page 23: ... 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 complete settings will not be stored in memory To continue with the reservation press buttons Follow step 3 to 8 for reservation 9 After all the reservations have been set press SEND but...

Page 24: ...ther day 1 Press WEEKLY button to select Mode A or Mode B 2 Press WEEKLY button for about 3 seconds to start editing the reservation schedule 3 Press DAY button to select a day of the week to copy 4 Press COPY PASTE button Then PASTE blinks on the display Press CANCEL button to cancel the COPY mode Normal setting mode is activated 5 Press DAY button to select a day of the week to paste 6 Press COP...

Page 25: ...transmission An error code will be displayed Call service center and inform the error code Info Function to check monthly power consumption During installation in case of power failure or breaker ON OFF ensure to set the clock and calendar for each indoor unit unit in standby mode or auto restart for single or multi connection by pressing START STOP button Failure to do the above monthly power con...

Page 26: ...ain This indicates that COOLING and DEHUMIDIFYING mode operation is locked MODE button or will be displayed Ƶ 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 mode symbol before can...

Page 27: ...CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAK 18PSPA PSPA RAK 25 RAK 35PSPA INDOOR UNIT 218 12 7 RAK 18 25 35PSPA More than 50mm More than More than 50mm 50mm More than 2300mm Service space 27 ...

Page 28: ...utdoor unit installation allow at least 2 sides of space around the unit ensure ventilation f ue 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 i h l RAC 18 25 35WSPA 28 ...

Page 29: ... 89 6 33 3 91 9 M RED BLK WHT YEL BLU 35V 5V 0V 0 5V FG MODEL S L E D O M E L B A C I L P P A G N I T A R E M A N REVERSING VALVE COIL RAC 18 25 35WSPA 400 R O T I C A P A C M L I F 嘕 F DC 35V E C R U O S R E W O P DC 120 380V W 5 2 T U P T U O 47W Control circuit built in BLU BLUE YEL YELLOW BRN BROWN WHT WHITE GRY GRAY ORN ORANGE GRN GREEN RED RED BLK BLACK PNK PINK VIO VIOLET RED BLK WHT RAS_AW...

Page 30: ...PUT 1000W REFRIGERANT R 410A APPROVED MOTOR VOLTAGE 400V MAX U V 2 23 V X 2 23 U X 2 23 X DC VOLTAGE RED X EU125XB2 WHITE U YELLOW V CAUTION When the refrigerating cycle has 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 replac...

Page 31: ...WIRING DIAGRAM CAUTION The marked parts are very important ones for safety RAK 5 2 8 1 35PSPA NOTE 1 Connecting cable 1 5mm dia x2 C D line is used for the connection A P S W 5 3 5 2 8 1 C A R ...

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

Page 33: ...CIRCUIT DIAGRAM MODEL RAK 18 25 35PSPA ...

Page 34: ...MODEL RAC 18 25 35WSPA ...

Page 35: ...orary 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 Reset circuit Outdoor DC fan motor R...

Page 36: ...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 Hi or stop depending on the room temperature time and heat exchange temp...

Page 37: ...n 1 CKYMAX 2700 min 1 2700 min 1 2700 min 1 CJKMAX 2500 min 1 2500 min 1 2500 min 1 CBEMAX 2200 min 1 2200 min 1 2200 min 1 CSZMAX 1700 min 1 1700 min 1 1700 min 1 WMIN 1100 min 1 1100 min 1 1100 min 1 CMIN 1100 min 1 1100 min 1 1100 min 1 STARTMC 90 Seconds 90 Seconds 90 Seconds DWNRATEW 80 80 80 DWNRATEC 70 70 70 SHIFTW 1 00 1 00 1 00 SHIFTC 1 33 1 33 1 33 CLMXTP 30 00 30 00 30 00 TEION 4 00 4 0...

Page 38: ... 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 i...

Page 39: ... ...

Page 40: ...2 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...

Page 41: ... ...

Page 42: ...aintain 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 YNEO...

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 㻢 ...

Page 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 ...

Page 46: ...COOLING CYCLE INDOOR UNIT OUTDOOR UNIT HEATING CYCLE INDOOR UNIT OUTDOOR UNIT MODEL A P S W 5 3 5 2 8 1 C A R A P S P 5 3 5 2 8 1 K A R 27 6 3 3 27 6 3 3 ...

Page 47: ...ward and release the claws 2 Hold the front cover at both lower sides and pull them forward to remove Fig 3 Indicating P W B Control P W B Support hook 3 Control P W B and Indicating P W B 1 Remove each connector from the lead wire 2 Remove the four P W B supports from the control P W B 3 Pull the support hook at the upper side of the indication lamp of the indicating P W B and pull out the P W B ...

Page 48: ...ver 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 Fig 10 MODEL A P S W 5 3 5 2 8 1 C A R 6 Remove each connector and earth cable from the lead wire Then remove the electrical box 5 Remove the screws that fix the bearing cover to the left of the evaporator 6 Lift the left side of the eva...

Page 49: ...nerated using three terminal regulator IC121 1 Power circuit DESCRIPTION OF MAIN CIRCUIT OPERATION 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 C102 12V 5V 0V 5V C...

Page 50: ...et 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 㽲 pin of IC521 supply voltage and 㽼 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 powe...

Page 51: ...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 m...

Page 52: ...z 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 generate the buzzer s sound ...

Page 53: ...734 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 㷄 Room temperature Room temperature input ...

Page 54: ...10 10 10 10 R921 R924 R642 R544 R542 R610 R922 DSW1 DSW1 R923 R541 R543 93 ...

Page 55: ...TERMINAL BOARD RAC 18 25 35WSPA ...

Page 56: ... ...

Page 57: ... 䌔䌅䌓䌔䇭䌓䌗䌉䌔䌃䌈䌓䌗䌓䌅䌌䌆䇭䌃䌈䌅䌃䌋䌌䋨䌁䋩䌎䋨䌂䋩䇭䇭䌃䇭䇭䌄 ...

Page 58: ...ergization only when the above test proves the product to be normal If it is abnormal it should be a lead wire break or a reversing valve failure 䊶 Voltage when measured with a tester while the reversing valve is energized at the timing for voltage measurement 㶎Hold down the test switch of the outdoor electrical parts for at least 1 second 䇭 Energization begins 1 second after the test switch is pr...

Page 59: ... ...

Page 60: ...5 Electric expansion valve circuit 22 23 24 25 12 13 14 15 5 4 3 2 34 32 30 29 RED ...

Page 61: ...3 15A Fuse Switching power source ...

Page 62: ...3 15A 3 15A DC260 360V ...

Page 63: ... V is ON 7 Intelligent power module circuit IPM circuit Fig 7 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 TERMINAL BOARDC023 C022 C021 C024 R660 R008 C032 ...

Page 64: ...olled 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 7 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 7 3 shows voltage waveform at each point shown in Figs 7 1 and 7 4 First half of upper arm is chopper ...

Page 65: ...ntermittent 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 1 7 e l b a T 7 R008 C032 C023 C024 C021 C022 Fig 7 5 ...

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Page 69: ...on 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 Voltage at point A Ground voltage 350V Point B 0V line Indoor Controller Outdoor Controller Point 400 4 F M P I Compressor motor Point line Control P W B Main P W B Power PRECAUTIONS FOR CHECKING ...

Page 70: ......

Page 71: ... any code between the part and cabinet Removing electrical parts 1 Remove the electrical parts cover 2 Remove the connectors from the CN1 heat exchange thermistor CN15 stepping motor and CN10 fan motor 3 Remove two lock screws 4 Remove the electrical parts in the direction of arrow Removing control P W B 1 Remove the connectors from the CN12 2 Remove the P W B from the P W B support STRUCTURE OF A...

Page 72: ... ...

Page 73: ... been performed several times Note In some failure modes only the retry operation is repeated without lamp indication Failure modes that will repeat a retry operation without the indoor unit lamp indication are as follows OH thermistor temperature rise Outdoor unit communication error Power voltage abnormal Less frequent defects The LD301 indicates a mode of failure detected on the outdoor unit si...

Page 74: ... To check operation again when the timer lamp is blinking you can use the remote control for operation except for mode mark 1 TROUBLESHOOTING WHEN TIMER LAMP BLINKS Model Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink SELF DIAGNOSIS LIGHTING MODE Model RAS_AW_063 082e RA RAK Lights for 0 35 sec at interval of 0 35 sec K 18 25 35PSPA 18 25 35P...

Page 75: ...SELF DIAGNOSIS LIGHTING MODE MODEL RAC 18 25 35WSPA ...

Page 76: ...77 ...

Page 77: ... ...

Page 78: ...n Check outdoor electrical parts Check the refrigerating cycle Normal No Yes Check the drive circuit IPM using the PRD checker Check the position sensor circuit With the unit set in the operating state press the cooling heativg Does the unit operate for approximately 2 seconds the LD301 coming on and then stop due to a failure of switching the lamp blinking 4 times dehvmidity button ...

Page 79: ...AK 18 25 35PSPA RAC 18 25 35WSPA R L E D O M ...

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Page 84: ...2 DQG ILQLVK 3OHDVH WXUQ 2 RQFH ZLWKRXW IDLO 1RWHV 7KLV IXQFWLRQ LV YDOLG RQO RQFH ULJKW DIWHU VZLWFKLQJ 21 WKH SRZHU DQG GRHV QRW ZRUN LI RWKHU UHPRWH FRQWUROOHU RSHUDWLRQ ZDV PDGH SULRU WR LW 7DNH QRWH WKDW WKLV IXQFWLRQ PD QRW ZRUN ZKHQ QRW IROORZLQJ WKH DERYH SURFHGXUHV I LW GRHV QRW ZRUN VZLWFK 2 WKH SRZHU DQG WU DJDLQ I QRWKLQJ LV VWRUHG LQ WKH PHPRU WKH ODPS GRHV QRW EOLQN HYHQ LI UH LQGLFD...

Page 85: ...MODEL RAC 18 25 35WSPA ...

Page 86: ...WHVW Q L D 0 3 U R R G W X R H F D O S H 5 Q L D 0 3 U R R G W X R H F D O S H 5 Q L D 0 3 U R R G W X R H F D O S H 5 ...

Page 87: ...9 V 3 V 3 Q L D 0 3 U R R G W X R H F D O S H 5 V 3 9 ...

Page 88: ... Q L D 0 3 U R R G W X R H F D O S H 5 U R W R P Q D I H F D O S H 5 Q L D 0 3 U R R G W X R H F D O S H 5 ...

Page 89: ...HU VXSSO FRQWLQXRXVO 21 RXWGRRU PLFURFRPSXWHU ZLOO NHHS VKRZLQJ GLDJQRVLV UHVXOW ZLOO 21 DQG ZLOO EOLQNV DVH I PDLQ SRZHU VXSSO 2 DW RQFH WKHQ VZLWFK 21 DJDLQ D 2XWGRRU PLFURFRPSXWHU ZLOO ZDLW WKH VHOI FKHFN FRPPDQG E SUHVVLQJ WHVW VHUYLFH VZLWFK ZLWKLQ PLQXWHV EOLQNV WLPH I WHVW VHUYLFH VLJQDO LQSXW LV QRW UHFHLYHG XQLW ZLOO UHWXUQ WR QRUPDO RSHUDWLRQ PRGH DIWHU WKLV PLQXWHV KDV ODSVHG 2 DQG EOLQ...

Page 90: ... 1 7 5 027 21752 5 ...

Page 91: ...37 ...

Page 92: ...Please set the DIP switch No 6 to ON accordingly Refe to page r 54 ...

Page 93: ...54 ...

Page 94: ... ...

Page 95: ...e 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 mo...

Page 96: ...㶎㶎 Do not operate for 5 minutes or more Model RAC 18 25 35WSPA ...

Page 97: ...PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAK 18PSPA RAK 25PSPA RAK 35PSPA ...

Page 98: ...R I A 1 8 2 S A L E N A P T N O R F 1 9 2 E L N A P K 1 0 3 Y S S A L O R T N O C E T O M E R 1 1 3 R E V O C T N O R F 1 2 3 Y S S A R E V O C T 1 3 3 P A C 2 4 3 L E B A L H 1 5 3 R R E V O C S 1 6 3 L R E V O C S 1 7 3 E T A L P G N I T N U O M 1 8 3 NO HHAW PARTS NO RAK 18PSPA RAK 25PSPA RAK 35PSPA HWRAK 18PSPA 901 HWRAK 25PEA 902 HWRAS E10H3 903 PARTS NAME Q TY UNIT HWRAK 18PSPA 902 HWRAK 18P...

Page 99: ...MODEL RAC 18 25 35WSPA 45 46 48 50 51 52 53 ...

Page 100: ... 1 4 4 P W B CONTROL ELECTRIC ASSEMBLY 1 5 4 SOUND PROOF COVER 1 6 4 FUSE 3 15A 1 7 4 HOT GAS PIPE P A C C 1 8 4 G N I R P S 1 9 4 U Z K N A T S 1 0 5 D N A B 1 1 5 H S U B B U R 1 2 5 T E E H S G 1 3 5 HWRAC 18WSPA A28 HWRAC 18WSPA A25 HWRAC 18WSPA A26 HWRAC 18WSPA A27 NO HHAW PARTS NO RAC 18WSPA RAC 25WSPA RAC 35WSPA HWRAC 18WSA A01 HWRAC 18WSA A02 HWRAC 18WSA A03 PARTS NAME Q TY UNIT HWRAC SX10...

Page 101: ... 7 RAK 18PSPA RAC 18WSPA RAK 25PSPA RAC 25WSPA HHAW NO 0073E RAK 35PSPA RAC 35WSPA ...

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Hitachi RAC-18WSPA, Service Manual

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