Hitachi RAC-50NH5 Service Manual Download Page 4

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– 2 –

Metal plate
(of Al. stainless steel, etc.)

Working table

Resistor 1M

Ω

(1/2W)

Earth wire

Staple

Bare copper wire
(for body earth)

Fig. 3 Grounding of the working table

(6) Use a three wire type soldering iron including a grounding wire.

Use a high insulation mode (100V, 10M

Ω

or higher) when ordinary iron is to be used.

(7) In checking circuits for maintenance, inspection, or some others, be careful not to have the test probes

of the measuring instrument shortcircuit a load circuit or the like.

Soldering iron

Grounding wire

Screw stop at the screwed
part using a rag plate

Fig. 4 Grounding a solder iron

➤

Summary of Contents for RAC-50NH5

Page 1: ...L ONLY RAK 50NH5 RAC 50NH5 RAK 50NH5 REFER TO THE FOUNDATION MANUAL SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT ROOM AIR CONDITIONER JANUARY 2006 Refrigeration Air Conditioning Division INDOOR UNIT OUTDOOR UNIT RAC 50NH5 W A kW B T U h W A kW B T U h W H D kg RAK 50NH5 RAC 50NH5 DC INVERTER WALL TYPE TYPE MODEL POWER SOURCE TOTAL INPUT TOTAL AMPERES CAPACITY TOTAL INPUT TOTAL AM...

Page 2: ...6 Tools and measuring instruments for use in repairs or inspection should be accurately calibrated in advance 7 In installing the unit having been repaired be careful to prevent the occurence 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 gr...

Page 3: ...arts Even 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 1MΩ 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 ...

Page 4: ...g iron including a grounding wire Use a high insulation mode 100V 10MΩ or higher when ordinary iron is to be used 7 In checking circuits for maintenance inspection or some others be careful not to have the test probes of the measuring instrument shortcircuit a load circuit or the like Soldering iron Grounding wire Screw stop at the screwed part using a rag plate Fig 4 Grounding a solder iron ...

Page 5: ...casion 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: ... SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL RAK 50NH5 35W NO NO NO NO NO NO NO NO YES NO NO NO NO YES IC YES 40 W NO NO NO YES YES 3 0A G4A NO NO YES NO 450NR YES YES IC NO 1400g WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE UNIT PIPES MAX 20m REFRIGERANT CHARGING VOLUME Refrigerant 410A RAC 50NH5 JU1013D ...

Page 7: ... 5 CAUTION Figure showing the Installation of Indoor and Outdoor unit about 1 6m about 0 9m Connection Horizontally perpendicular to the unit ...

Page 8: ...he unit Without a circuit breaker the danger of electric shock exists Do not install near location where there is flammable gas The outdoor unit may catch fire if flammable gas leaks around it Please ensure smooth flow of water when installing the drain hose CAUTION PRECAUTIONS DURING SHIFTING OR MAINTENANCE PRECAUTIONS DURING OPERATION Avoid an extended period of direct air flow for your health W...

Page 9: ...unt of heat in the room is above the cooling or heating capability of the unit for example more people entering the room using heating equipments and etc the preset room temperature cannot be achieved This appliance is not intended for use by young children or infirm persons unless they have been adequately supervised by a responsible person to ensure that they can use the appliance safely Young c...

Page 10: ...le the lamp lights To re start an indoor unit which was operated later stop the indoor unit which was operated first or later and reset the type of operation then perform operation again One unit Heating Other unit Cooling Dehumidifying Circulating fan Adjusting the Number of Indoor Units Decrease the number of indoor units to be operated especially when it is very hot or cold or when you want to ...

Page 11: ...about once every one hour when frost forms on the heat exchanger of the outdoor unit for 5 10 minutes each time TIMER LAMP This lamp lights when the timer is working TEMPORARY SWITCH TEMPORARY SWITCH Press Temporary Switch Non conductor Stick TEMPORARY SWITCH Use this switch to start and stop when the remote controller does not work Use non conductor stick example toothpick By pressing the tempora...

Page 12: ...PERATURE buttons Use these buttons to raise or lower the temperature setting Keep pressed and the value will change more quickly TIME button Use this button to set and check the time and date RESET buttons FUNCTION selector Use this button to select the operating mode Every time you press it the mode will change from AUTO to HEAT to DEHUMIDIFY to COOL and to FAN cyclically FAN SPEED selector This ...

Page 13: ...eep Press the button again to stop operation You can raise or lower the temperature setting as necessary by maximum of 3 C Press the temperature button and the temperature setting will change by 1 C each time The preset temperature and the actual room temperature may vary somewhat depending on conditions The display does not indicate the preset temperature in the AUTO mode If you change the settin...

Page 14: ...t first and varies to MED or LOW automatically when the preset temperature has been reached HI Economical as the room will become warm quickly But you may feel a chill at the beginning MED Fan speed slow LOW Fan speed slower Set the desired room temperature with the TEMPERATURE buttons the display indicates the setting The temperature setting and the actual room temperature may vary somewhat depen...

Page 15: ...temperature setting The function will stop the indoor unit will stop emitting air as soon as the room temperature becomes lower than the setting temperature Set the desired room temperature with the TEMPERATURE button the display indicates the setting The range of 20 26 C is recommended as the room temperature for dehumidifying Press the START STOP button Dehumidifying operation starts with a beep...

Page 16: ...ED Fan speed slow LOW Fan speed slower Set the desired room temperature with the TEMPERATURE button the display indicates the setting The temperature setting and the actual room temperature may vary some how 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...

Page 17: ... setting temperature is large fan starts to run at HI speed After room temperature reaches the preset temperature the cooling operation which changes the fan speed and room temperature to obtain optimum conditions for natural healthful cooling will be performed For the cooling operation FAN OPERATION You can use the device simply as an air circulator Use this function to dry the interior of the in...

Page 18: ...EL button The RESERVED sign goes out with a beep and the TIMER lamp turns off on the indoor unit 1 Set the current month and day with the TIMER control button 1 Press the OFF TIMER button The OFF mark blinks on the display 1 Press the ON TIMER button the ON mark blinks on the display 2 Set the turn off time with the TIMER control button Press the RESERVE button 3 Press the ON TIMER button so that ...

Page 19: ...th the TIMER control button The setting of turn off time is now complete Example The device will turn off at 11 00p m Example The device will turn on at 7 00 a m The setting of the turn on time is now complete 4Set the turn on time with the TIMER control button 5 Point the signal window of the remote controller toward the indoor unit and press the RESERVE button The ON mark starts lighting instead...

Page 20: ...ller The TIMER lamp lights with a beep from the indoor unit When the sleep timer has been set the display indicates the turn off time Example If you set 3 hours sleep time at 11 38 p m the turn off time is 2 38 a m 2 Press the SLEEP button and set the sleep timer The device will be turned off by the sleep timer and turned on by on timer How to Cancel Reservation Point the signal window of the remo...

Page 21: ...sleep timer can not be set If you set the sleep timer after the off on off or off on timer has been set the sleep timer becomes effective instead of the off on off or off on timer set earlier You can not set other timer during sleep timer operation After sleep timer time is up and when press sleep button again the sleep timer will be set as last setting Sleep timer effective only once NOTE ...

Page 22: ...usting range shown on the right When the operation is stopped the horizontal air deflector moves and stops at the position where the air outlet closes Vertical Vertical about 15 about 60 about 45 about 30 When cooling dehumidifying When heating CAUTION In Cooling operation do not keep the horizontal air deflector swinging for a long time Some dew may form on the horizontal air deflector and dew ma...

Page 23: ...e old batteries 2 Install the new batteries The direction of the batteries should match the marks in the case 1 Do not use new and old batteries or different kinds of batteries together 2 Take out the batteries when you do not use the remote controller for 2 or 3 months CAUTION Push and pull to the direction of arrow ...

Page 24: ...with your wake up time in the morning This will enable you to enjoy a comfortable room temperature Please use the timer effectively Dusty air filter will reduce the air volume and the cooling efficiency To prevent from wasting electric energy please clean the filter every 2 weeks Please pay attention to the room temperature and air flow direction when operating the unit for baby children and old f...

Page 25: ...e used for a long period of time please switch off the power from the mains If the power from mains remains ON the indoor unit still consumes about 8W in the operation control circuit even if it is in OFF mode Warning To protect the whole unit during lightning please stop operating the unit and remove the plug from the socket OFF Interference From Electrical Products Caution To avoid noise interfe...

Page 26: ... structure In case of removing the air cleansing filters please follow the above procedures The cooling capacity is slightly weakened and the cooling speed becomes slower when the air cleansing filters are used So set the fan speed to HIGH when using it in this condition Air cleansing filters are washable and reusable up to 20 times by using vacuum cleaner or water rinse under running tap water Ty...

Page 27: ...g tap water and gently brush it with soft bristle brush Allow filters to dry in shade Re insert the air cleansing filter to the filter frame Set the filter with FRONT mark facing front and slot them into the original state After attaching the filters push the front panel at three arrow portions as shown in figure and close it Do not wash with hot water at more than 40 C The filter may shrink When ...

Page 28: ...he front panel with both hands to detach and attach it CAUTION Do not splash or direct water to the body of the unit when cleaning it as this may cause short circuit Never use hot water above 40 C benzine gasoline acid thinner or a brush because they will damage the plastic surface and the coating Removing the Front Panel When the front panel is fully opened with both hands push the right arm to t...

Page 29: ...QUALIFIED SERVICE PERSONAL EITHER EVERY HALF YEARLY OR YEARLY CONTACT YOUR SALES AGENT OR SERVICE SHOP Is the earth line disconnected or broken Is the mounting frame seriously affected by rust and is the outdoor unit tilted or unstable Is the plug of power line firmly plugged into the socket Please ensure no loose contact between them Air Blow Cleaning and maintenance must be carried out only by q...

Page 30: ...ng noise of refrigerant in the refrigerating cycle 2 Slight rubbing noise from the fan casing which is cooled and then gradually warmed as operation stops The odor will possibly be emitted from the room air conditioner because the various odor emitted by smoke foodstuffs cosmetics and so on sticks to it So the air filter and the evaporator regularly must be cleaned to reduce the odor Please contac...

Page 31: ...ly Companies are to be observed Minimum Maximum Minimum Maximum Indoor Dry bulb C 21 32 20 27 Wet bulb C 15 23 12 19 Outdoor Dry bulb C 21 43 2 21 Wet bulb C 15 26 1 15 Note Avoid to use the room air conditioner for cooling operation when the outside temperature is below 21 C 70 F The recommended maximum and minimum operating temperatures of the hot and cold sides should be as below Cooling Heatin...

Page 32: ... 30 CONSTRUCTION AND DIMENSIONAL DIAGRAM ...

Page 33: ... 31 CONSTRUCTION AND DIMENSIONAL DIAGRAM FOR OUTDOOR MODEL RAC 50NH5 ...

Page 34: ...ON 16 7 62 1 20 0 68 0 OFF 16 0 60 8 20 7 69 3 ON 24 7 76 5 28 0 82 4 OFF 24 0 75 2 28 7 83 7 ON 32 7 90 9 36 0 96 8 OFF 32 0 89 6 36 7 98 1 M RED BLK WHT YEL BLU 35V 5V 0V 0 5V FG MODEL RAK 50NH5 POWER SOURCE DC 5V 35V DC360V OUTPUT 25W 40W 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 360V BLK 0V WHT 15V M...

Page 35: ...0 C 68 F 75 C 167 F RESISTANCE VALUE 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 replace the compressor 2M 1 05 2M 1 28 U V W M M M WHITE YELLOW RED RAC 50NH5 JU1013D ...

Page 36: ...8 WHT CN15 WHT CN13 CN11 5 5 CN12 CN12 RED GRY 2A FUSE ICP RELAY R008 R007 3A FUSE 25A FUSE C006 R001 BLK GRN WHT WHT BRN RED BLK CONNECTING CORD BRN RED BLK BLK GRN RED BLK WHT YEL BLU POWER CIRCUIT TERMINAL BOARD GRN YEL L N C D SINGLE PHASE AC220 230V 50Hz GRN YEL THERE ARE SOME LEAD WIRES WHICH HAVE SPIRAL STRIPES WITH WHITE IN ADDITION TO THE ORIGINAL COLOR CN2 RED MAIN P W B REVERSING VALVE ...

Page 37: ...G40 P40 P41 P42 P43 P00 P01 P02 P03 P10 P11 P12 P13 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 BEEP P20 P30 P31 NCVL C1 VL C2 VL C3 XC IN XC OUT VDD X OUT X IN RESET CARR P23 P22 P21 VSS IC 1 M3455OM6A 504FP LCD 1 C8 50v 1u K 1 D3 RB425D 1 2 K2K3 K4 K5 P10 P11 P12 K6 K7 K8 K9 K10 K11K12 K18 K17 K15 K16 K13 K14 D0 D1 D2 D3 R1 100k SW1 R2 P 100k R3 100k R4 100k R5 Q1 2SC3443 or 2SC2982 R6 R7 R9 D2 D1 D1 D2 EL 1L...

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Page 41: ... 44 MODEL RAK 50NH5 RECEIVING P W B MARKING ON P W B COMPONENT SIDE SOLDERING SIDE ...

Page 42: ... 45 MAIN P W B ...

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Page 45: ... 51 Table 1 Mode data file RAK 50NH5 LABEL NAME VALUE 6200 Ð 6250 Ð 52 Ð 6 Ð 57 Ð 58 Ð 5 0 Ð 355 Ð 2700 Ð 20 Ð 2 Ð Ð 3 33 0 33 8 9 1 00 145 260 ...

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Page 51: ...1 2 INDOOR UNIT SINGLE ENDED UNION 1 2 R O S S E R P M O C SERVICE VALVE 1 4 ELECTRIC EXPANSION VALVE STRAINER STRAINER HEATING OUTDOOR UNIT REVERSING VALVE SUCTION TANK SERVICE VALVE 1 2 R O S S E R P M O C SERVICE VALVE 1 4 ELECTRIC EXPANSION VALVE STRAINER STRAINER SINGLE ENDED UNION 1 4 INDOOR UNIT SINGLE ENDED UNION 1 2 SINGLE ENDED UNION 1 4 ...

Page 52: ... 64 N O I T C N U F G N I W S O T U A ...

Page 53: ... 65 RAK 50NH5 ...

Page 54: ...ion Microcomputer Buzzer output BZ1 12V 0V R721 30 1 16 BZ When the buzzer sounds an approx 3 9kHz square signal is output from buzzer output pin of the microcomputer 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 buzzerís sound 12V R1 0V 0V 13 RECEIVER I P Microcomputer R211 R...

Page 55: ...tor Table 4 1 shows the rotation angle of horizontal air deflectors Table 4 1 Auto sweep Motor Rotation Rotation angle per step Time per step ms 0 0882 10 Horizontal air deflectors Microcomputer pins Step width Horizontal air deflectors 10ms Horizontal air deflectors 15 16 17 18 1 2 3 4 5 6 7 8 Fig 4 2 Microcomputer Output Signals 10 11 8 9 12 0V 7 6 5 4 18 17 16 Microcomputer IC711 C711 C712 C713...

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Page 57: ...reheating activation value and the rating and maximum speed of the compressor etc to their initial values Data of self diagnosis mode is stored in IC401 or IC402 data will not be erased even when power is turned off Fig 7 1 Microcomputer External ROM SCL SDA 0V 0V 0V 5V 5V 5V C401 IC401 E2 PROM 4 0 4 R 3 0 4 R 27 26 1 2 3 4 8 7 6 5 ...

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Page 69: ...ing to IC901 Reference If the power circuit for P W B seems to be faulty 1 Make sure that 5V and 12V on the control P W B upper arm U V and W and the lower arm power voltage are the specified values 2 When only the 5V output is low REG 1 regulator faulty 5V 0V shorted output is too high or REG 1 is abnormal 3 When 12V and 5V are abnormal The following defects can be considered 1 Fan operation powe...

Page 70: ... 82 ...

Page 71: ... 83 6 Rotor magnetic pole position detection circuit Ð Ð Ð Ð ...

Page 72: ... 84 7 Drive Circuit ...

Page 73: ... 85 Low speed rotation mode High speed rotation mode ...

Page 74: ... 86 8 HIC and Peripheral Circuits ...

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Page 76: ... 88 1 ...

Page 77: ... 89 2 5 ...

Page 78: ... 90 Ð Ð Ð Ð ...

Page 79: ... 91 9 Temperature Detection Circuit ...

Page 80: ... 92 10 Reset Circuit Ò Ó Ò Ó Ò Ó Ð ...

Page 81: ... 93 Ð 11 Outdoor DC Fan Motor control circuit Ð Ð ...

Page 82: ...ing inside of outdoor unit by snowing It may make ÒFan Lock StopÓ 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 ÒFan Lock StopÓ even though the DC Fan Motor is rotating correctly the possible casue is Fan Motor problem or PQ102 on board or control board problem Stop after the Fan motor runs 2 minutes Fan Motor may be br...

Page 83: ... 95 12 Power Factor Control Circuit ...

Page 84: ... 96 ...

Page 85: ... 97 AUTO FRESH DEFROSTING AUTO OPERATION NICE TEMPERATURE RESERVATION INFRARED REMOTE CONTROL ÒNice Ó ÒNice Ó ÒNice Ó Q7 A7 Q8 A8 Q9 A9 Q10 A10 A11 Q12 A12 Q13 A13 Q14 A14 Q11 ...

Page 86: ... 98 OTHERS Q15 A15 Q16 A16 Q17 A17 Q18 A18 Q19 A19 ...

Page 87: ... 99 TROUBLE SHOOTING Model RAK 50NH5 RAC 50NH5 M ...

Page 88: ...each part of circuit in indoor unit electrical parts disconnect red gray lead wire connected from diode stack to system power module SPM2 to prevent secondary trouble Be sure to discharge smoothing capacitor Do not use a soldering iron with transformer If one is used thermal fuse inside transformer will be blown DISCHARGE PROCEDURE AND POWER SHUT OFF METHOD FOR POWER CIRCUIT WARNING As shown above...

Page 89: ...es Yes Yes No No No Normal No No Timer lamp Press the service switch for 1 sec Does the compressor operate After checking be sure to press the service switch to stop the operation Check the refrigerating cycle Check the outdoor electrical parts Check the indoor electrical parts Check to see whether the F cable is connected incorrectly or disconnected See Out door unit self diagnosis lamp lighting ...

Page 90: ...ta read from IC401 or IC402 is incorrect 1 Reversing valve defective 2 Heat exchanger thermistor disconnected only in the heating mode Note The malfunction mode is entered the 3rd time this abnormal indication appears read every 3 minutes Electrical parts in the outdoor unit 1 Indoor interface circuit 2 Outdoor interface circuit Please check at the outdoor electrical led lamp blinking LD301 and re...

Page 91: ... 103 SELF DIAGNOSIS LIGHTING MODE ...

Page 92: ... generated between terminals C and D on the terminal board Are control voltages 12V 5V being generated normally Check according to the proper method for checking the power circuit No No No No Y es Y es Do the air deflectors perform initial operation when the power supply is turned on and off Check the indication P W B connection cord and light receiving unit No No Is the microcomputer reset input ...

Page 93: ...eck outdoor electrical parts and repair any defective parts around the outdoor interface transmitting circuit Check the indoor interface transmitting circuit Replace IC801 Check outdoor electrical parts and repair any defective parts around the outdoor interface transmitting circuit Is the indoor transmitting signal being generated at Q801 s collector No No Yes Yes 0V Approx 35V 38kHz Approx 2Vp p...

Page 94: ... check The microcomputer fan PWM output pin is Hi Yes Yes Yes Yes No Yes Yes Yes No No Yes No No Set to the Hi fan mode The operation lamp lights once and goes out in 5 10 seconds Disconnect CN10 and set to the fan mode again Replace the indoor fan motor The operation lamps lights once and goes out in 5 10 seconds Check to see if shorting etc has occurred in the P W B pattern Check to see if the i...

Page 95: ...less than 1W Blown open if it is 1W or more Replace ICP1 Check if shorting has occurred in the air deflector motor If these are defective ICP1 will be open again Replace REG2 Check the 5V line if the 5V line is shorted ICP1 will be open again No No Replace IC111 Perform final operation check No Replace ICP2 Check if shorting has occurred in fan motor circuit and 35V interface circuit If these are ...

Page 96: ...rd The sensible area should flash in orange when you operate the remote control unit if it is good Ultra redray test card Sensible area Within 2 cm Check functions again If it does not work replace the remote controller Within 15 cm AM radio Check the LED D1 with a multimeter Replace the battery Install the battery in the correct polarity Y es Y es No No No Y es Does the radio buzz noisily Is batt...

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Page 98: ...o r t n o c e h t y a l e r e c a f r e t n i g n i e b V 0 1 t s a e l t a e g a t l o v a s I t c a t n o c e h t n e e w t e b d e t a r e n e g y a l e r e c a f r e t n i f o s l a n i m r e t t i u c r u c e c a f r e t n i e h t k c e h C s e Y s e Y o N o N s e Y e v i t c e f e d e b y a m 0 1 9 C d n a 7 0 9 D e h t n e e w t e b n o i t c e s e v i t c e f e d a s i e r e h T n o y l p ...

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Page 101: ...n e l u d o m r e w o p t u p n i P I r e t u p m o c o r c i m e h t s I l a m r o n l a n g i s n i p y l l a m r o N 7 1 V 5 x o r p p a s i l a m r o n t i u c r i c t e s e r e h t s I r e t u p m o c o r c i m y l l a m r o N n i p 8 4 V 5 x o r p p a s i s t r a p e v i t c e f e d y n a e c a l p e R s t r a p e v i t c e f e d y n a e c a l p e R s t r a p e v i t c e f e d y n a e c a l ...

Page 102: ...L lamp lit If the lamp is lit it does not indicate fault but the unit is overload status Recheck cord etc of the system power module If they are disconnected connect them securely If abnormality continues replace the system power module Overvoltage defect system power module faulty 15 times blinking Yes No ...

Page 103: ...in the same condition as above The compressor is defective 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 ...

Page 104: ...e of digital tester since built in battery is set in reverse direction and terminals are reversed CAUTION If inner circuit of system power module is disconnected open the indicator of tester will not swing and this may assumed as normal In this case if indicator swings when and terminals are connected in reverse of diagram below it is normal Furthermore compare how indicator swings at U V and W ph...

Page 105: ... 117 HOW TO OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNIT HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY ...

Page 106: ...E Collector Emitter PGU PGV PGW NGU NGV NGW U V W P1 P2 U N1 L2 L1 W V Circuit diagram of the device excepting the reflux diode Circuit diagram of the module Terminals symbol mark of the module See next page for measuring value using tester ...

Page 107: ...Front c over 1 After removing two screws pull the center of the front cover forward and release the claws 2 Hold the front cover at both lower sides and pull them forward to remove Fig 3 Reception indication P W B Main P W B Support hook 3 Main P W B and Reception Indication P W B 1 Remove each connector from the lead wire 2 Remove the four P W B supports from the main P W B 3 Pull the support hoo...

Page 108: ...rews from the upper and lower bearing covers 4 Remove the locking hook of the lower bearing cover from the Cabinet Fig 6 5 Remove two lock screws from the fan motor holder 6 Pull up the evaporator by holding it at the lower side Insert a screwdriver through the space between the evaporator and drain chute and loosen the fan lock screw to remove the fan and fan motor Fig 7 Lower bearing cover Cabin...

Page 109: ... 121 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAK 50NH5 ...

Page 110: ...4 917 1 TERMINAL PMRAS 260GHA 001 1 THERMISTOR ASSY BOARD 20 PMRAK 50NH5 001 1 P W B MAIN 21 PMRAS 25YH4 922 2 1 P W B RECEIVER 25 PMRAS 25YH 4 926 1 DRAIN PAN ASSY 28 PMRAS 25YH 4 929 1 AUTO SWEEP MOTOR 32 PMRAS 25YH4 933 1 FRONT COVER ASSEMBLY 35 PMRAS 25YH4 936 1 FRONT PANEL 36 PMRAS 25YH 4 937 1 AIR FILTER R 37 PMRAS 25YH 4 938 1 AIR FILTER L 38 PMRAS 25YH 4 939 1 LOW COVER 39 PMRAS 25YH 4 940...

Page 111: ... 123 ...

Page 112: ...REACTOR 17 PMRAC 50YH5 901 1 P W B MAIN 20 PMRAC 40CNH2 901 1 SYSTEM POWER MODULE 22 PMRAC 25NH4 913 1 TERMINAL BOARD 23 PMRAC 19SH4 901 1 THERMISTOR OUTSIDE TEMPERATURE 24 PMRAC 40CNH2 917 1 PROPELLER FAN 26 PMRAC 40CNH2 918 1 SUPPORT FAN MOTOR 27 PMRAC 40CNH2 919 1 FAN MOTOR 40W 28 PMRAC 40CNH2 904 1 CABINET 29 PMRAC 40CNH2 921 1 NET 30 PMRAC 40CNH2 922 1 TOP COVER 31 PMRAC 50NH4 910 1 SIDE PLAT...

Page 113: ...RAK 50NH5 RAC 50NH5 HITACHI PM NO 0302E Printed in Malaysia ...

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