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Hitachi RAK-18NH6, Service Manual

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Hitachi RAK-18NH6 Service Manual Download Page 38

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Please note:
On switching on the equipment, particularly when the room light is dimmed, a slight brightness fluctuation
may occur. This is of no consequence.
The conditions of the local Power Supply 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
-10

°

C (14

°

F).

The recommended maximum and minimum operating temperatures of the hot and cold sides
should be as below:

Cooling

Heating

Summary of Contents for RAK-18NH6

Page 1: ...AL DIAGRAM 38 MAIN PARTS COMPONENT 39 WIRING DIAGRAM 40 CIRCUIT DIAGRAM 43 PRINTED WIRING BOARD LOCATION DIAGRAM 45 BLOCK DIAGRAM 47 BASIC MODE 49 REFRIGERATING CYCLE DIAGRAM 63 AUTO SWING FUNCTION 65 DESCRIPTION OF MAIN CIRCUIT OPERATION 66 SERVICE CALL Q A 71 PARTS LIST AND DIAGRAM 81 RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 COOLING HEATING 780 280 220 RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 RAK ...

Page 2: ... 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 grounding terminal of the unit The insulation resistance should be 1M or mo...

Page 3: ...of parts Even rejected goods should be handled in the same way Fig 1 Conductive Container 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 bo...

Page 4: ... the screwed part using a rag plate Soldering iron Grounding wire Fig 4 Grounding a soldering iron Use a high insulation mode 100V 10M 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 Metal plate of aluminium stainless steel etc Stapl...

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: ... MICROPROCESSOR POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 35W NO NO NO NO NO NO NO NO YES NO NO NO NO YES IC YES WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE UNIT PIPES REFRIGERANT CHARGING VOLUME Refrigerant 410A ...

Page 7: ... 2 81 8 14 7 50 99 47 13 5 2 5 1 00 3 10 8 540 3 415 10 585 750 200 880 3 33 3 44 3 16 99 38 8 5 5 40 1 50 5 90 18 430 5 120 20 130 1 795 200 1 980 3 01 8 30 7 60 99 52 2 5 1 10 3 20 8 540 3 756 10 927 690 200 970 3 62 3 17 2 90 99 36 7 3 6 50 0 9 8 1 22 180 3 070 27 640 1 970 155 2 100 3 30 9 00 8 30 99 4 7 13 5 3 4 1 10 4 40 11 610 3 756 15 024 870 200 1 120 3 91 3 99 3 66 99 39 8 5 7 2 1 50 7 2...

Page 8: ... 1160 200 1280 1780 200 1960 1190 200 1300 1310 200 1450 1650 200 1820 1795 200 1980 1650 200 1820 1730 200 1900 2 6 2 4 3 6 3 3 5 3 4 9 8 2 7 5 5 5 5 0 6 0 5 5 7 6 6 9 8 2 7 6 7 6 6 9 7 9 7 3 2 50 1 10 3 20 3 90 1 10 4 70 4 80 1 10 5 80 6 50 1 10 7 20 2 50 2 50 1 50 5 20 2 40 3 80 1 50 6 30 2 30 4 50 1 50 7 20 2 00 5 00 1 50 7 20 3 40 3 40 1 50 7 20 3 15 3 85 1 50 7 20 750 200 1050 1145 200 1380 ...

Page 9: ...5 RAK 35NH5 RAF 35NH5 RAD 35NH5 RAI 35NH5 1 8 2 5 2 5 2 5 2 5 3 5 3 5 3 5 3 5 1 00 2 50 1 00 2 80 1 00 2 80 1 00 2 80 1 00 2 80 1 00 3 90 1 00 3 90 1 00 3 90 1 00 3 90 1 10 3 20 1 10 4 70 1 10 4 70 1 10 4 70 1 10 4 70 1 10 5 80 1 10 5 80 1 10 5 80 1 10 5 80 8 12 11 17 11 17 11 17 11 17 16 24 16 24 16 24 16 24 9 11 14 18 14 18 14 18 14 18 17 22 17 22 17 22 17 22 Be sure to connect two indoor units ...

Page 10: ... 15 12 15 11 14 14 18 1 8 1 8 1 8 1 8 2 5 2 5 1 8 2 5 3 5 5 0 2 5 3 5 2 5 3 5 4 0 5 0 means indoor units cooling capacity class 1 Marking needs flare adapter 9 52 12 7D Part No TA261D 4 001 2 Suitable room size is determined based on the conditions below Climate is in the temperate zone like Tokyo Japan For usual residential use Smaller figure is for light construction which means light thermally ...

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Page 12: ... 11 ...

Page 13: ... 12 ...

Page 14: ... 13 ...

Page 15: ...anger 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 A R N I N G Should abnormal situation ...

Page 16: ...ount 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 ...

Page 17: ...panel Indoor unit indicators Light indicator showing the operating condition Refer page 15 Horizontal deflector Vertical deflector Air Outlet Refer page 26 Remote controller Send out operation signal to the indoor unit So as to operate the whole unit Refer page 16 WIDTH mm 780 MODEL RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 HEIGHT mm 280 DEPTH mm 220 MODEL NAME AND DIMENSIONS ...

Page 18: ...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 19: ...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 20: ...th a beep 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 ...

Page 21: ...ed is HI at 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 some...

Page 22: ...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 23: ...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 24: ...re and 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 ...

Page 25: ...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 26: ...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 27: ...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 28: ...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 29: ...ge shown on the right When the operation is stopped the horizontal air deflector moves and stops at the position where the air outlet closes 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 may drop RESET Adjustment of the conditioned air in the upward and downward directions The horizontal air ...

Page 30: ...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 31: ...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 32: ...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 33: ...Cleaning and maintenance must be carried out only by qualified service personal Before cleaning stop operation and switch off the power supply CAUTION CAUTION Do not bend the air cleansing and deodorizing filter as it may cause damage to the structure NOTE In case of removing the air cleansing and deodorizing filters please follow the above procedures The cooling capacity is slightly weakened and ...

Page 34: ...dry in shade 3 Re insert the air cleansing and deodorizing 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 CAUTION Do not wash with hot water at more than 40 C The filter may shrink When washing it shake off moisture completely and dr...

Page 35: ...ith 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 HITACHI DC INVERTER When the front panel is fully opened with both hands push the right arm ...

Page 36: ...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 37: ...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 38: ...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 10 C 14 F The recommended maximum and minimum operating temperatures of the hot and cold sides should be as below Cooling Heatin...

Page 39: ... 38 MODEL RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 47 5 60 205 220 ...

Page 40: ...ODEL IC OPERATION MODE COOL HEAT 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 MODEL RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 POWER SOURCE DC 5V 35V OUTPUT 25W 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 M RED BLK WHT...

Page 41: ... 40 WIRING DIAGRAM MODEL RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 INDOOR UNIT ...

Page 42: ...52 51 50 49 48 47 46 45 44 43 41 42 65 66 67 68 69 70 71 72 74 75 77 78 79 80 73 76 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 24 23 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 SEG32 SEG33 SEG34 SEG35 SEG19 SEG18 SEG17 SEG16 SEG15 SEG14 SEG13 SEG12 SEG11 SEG10 SEG9 SEG8 SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 SEG0 SEG43 SEG42 SEG41 SEG40 P40 P41 P42 P43 P00 P01...

Page 43: ...CIRCUIT DIAGRAM MODEL RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 43 ...

Page 44: ... 45 RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 PRINTED WIRING BOARD LOCATION DIAGRAM ...

Page 45: ... 46 MODEL RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 RECEIVING P W B MARKING ON P W B ...

Page 46: ...er HIC AX 6M01 Trip signal synthesis circuit L N RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 SPM2 Outdoor unit Terminal board Indoor microcomputer AX 7R11 Wireless receive circuit Filter Operation Timer Auto sweep motor for Air deflector LCD wireless Heat exchanger thermistor Room temperature thermistor Reset circuit Initial setting circuit Temporary switch Indoor microcomputer AX 7R11 Indoor 2 Outdoo...

Page 47: ...ed for the first indoor unit the next indoor unit will then start to heat Also if cooling or dehumidifying is automatically selected for the first indoor unit the next indoor unit will also start to cool or dehumidify One unit Heating Other unit Cooling Dehumidifying Circulating fan Notes 1 Refer to the PWRITE ZU data for the constants expressed by capital alphabet letters in the drawing 2 The spe...

Page 48: ...ON_M 2 C 2 C 2 C 2 C 14F TEIOF_M 9 C 9 C C C 157 CMNLMT_M 0 min 1 0 min 1 0 min 1 0 min 1 178 FWSS_M 500 min 1 500 min 1 500 min 1 500 min 1 179 FWSOY_M 600 min 1 600 min 1 700 min 1 700 min 1 17A FWS_M 720 min 1 750 min 1 820 min 1 820 min 1 17B FWKAF_M 840 min 1 850 min 1 920 min 1 920 min 1 17C FWL_M 840 min 1 850 min 1 920 min 1 920 min 1 17D FWAH_M 940 min 1 1050 min 1 1120 min 1 1120 min 1 1...

Page 49: ... 53 ...

Page 50: ... 55 ...

Page 51: ... 57 Dehumidifying Dehumidifying Sleep Operation ...

Page 52: ... 59 4 4 ...

Page 53: ... 61 ...

Page 54: ... 63 REFRIGERATING CYCLE DIAGRAM RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 ...

Page 55: ...ervice valve 1 4 Service valve 3 8 Service valve 3 8 Single ended union 3 8 Single ended union 3 8 Single ended union 1 4 Indoor heat exchanger Air Flow Air Flow Indoor heat exchanger Single ended union 1 4 Charge port 1 2 Charge port 1 2 Service valve 1 4 Electric expansion 1 valve Electric expansion 2 valve Strainer Strainer Strainer Silencer Scroll Compressor ...

Page 56: ... 65 RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 ...

Page 57: ... 66 RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 ...

Page 58: ... 67 ...

Page 59: ... 68 ...

Page 60: ... 69 ...

Page 61: ... 70 ...

Page 62: ... 71 MODEL RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 ...

Page 63: ... 72 ...

Page 64: ... 73 ...

Page 65: ... 74 RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 ...

Page 66: ... 75 ...

Page 67: ... 76 2 ...

Page 68: ... 77 5 ...

Page 69: ... 78 ...

Page 70: ... 79 RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 ...

Page 71: ... 80 ...

Page 72: ... 81 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 ...

Page 73: ... 1 TERMINAL BOARD 2P 18 PMRAS 260GHA 001 1 THERMISTOR ASSEMBLY 20 PMRAK 18NH6 001 1 P W B MAIN 21 PMRAS 25YH4 922 1 P W B RECEIVER 25 PMRAS 25YH4 926 1 DRAIN PAN 28 PMRAS 25YH4 929 1 AUTO SWEEP MOTOR 32 PMRAK 18NH6 002 1 FRONT COVER ASSEMBLY 35 PMRAK 18NH6 003 1 FRONT PANEL 36 PMRAK 18NH6 004 1 AIR FILTER R 37 PMRAK 18NH6 005 1 AIR FILTER L 38 PMRAS 25YH4 939 1 LOWER COVER 39 PMRAS 25YH4 940 1 MOU...

Page 74: ... 1 TERMINAL BOARD 2P 18 PMRAS 260GHA 001 1 THERMISTOR ASSEMBLY 20 PMRAK 25NH6 001 1 P W B MAIN 21 PMRAS 25YH4 922 1 P W B RECEIVER 25 PMRAS 25YH4 926 1 DRAIN PAN 28 PMRAS 25YH4 929 1 AUTO SWEEP MOTOR 32 PMRAK 18NH6 002 1 FRONT COVER ASSEMBLY 35 PMRAK 18NH6 003 1 FRONT PANEL 36 PMRAK 18NH6 004 1 AIR FILTER R 37 PMRAK 18NH6 005 1 AIR FILTER L 38 PMRAS 25YH4 939 1 LOWER COVER 39 PMRAS 25YH4 940 1 MOU...

Page 75: ... 1 TERMINAL BOARD 2P 18 PMRAS 260GHA 001 1 THERMISTOR ASSEMBLY 20 PMRAK 35NH6 001 1 P W B MAIN 21 PMRAS 25YH4 922 1 P W B RECEIVER 25 PMRAS 25YH4 926 1 DRAIN PAN 28 PMRAS 25YH4 929 1 AUTO SWEEP MOTOR 32 PMRAK 18NH6 002 1 FRONT COVER ASSEMBLY 35 PMRAK 18NH6 003 1 FRONT PANEL 36 PMRAK 18NH6 004 1 AIR FILTER R 37 PMRAK 18NH6 005 1 AIR FILTER L 38 PMRAS 25YH4 939 1 LOWER COVER 39 PMRAS 25YH4 940 1 MOU...

Page 76: ... 1 TERMINAL BOARD 2P 18 PMRAS 260GHA 001 1 THERMISTOR ASSEMBLY 20 PMRAK 50NH6 001 1 P W B MAIN 21 PMRAS 25YH4 922 1 P W B RECEIVER 25 PMRAS 25YH4 926 1 DRAIN PAN 28 PMRAS 25YH4 929 1 AUTO SWEEP MOTOR 32 PMRAK 18NH6 002 1 FRONT COVER ASSEMBLY 35 PMRAK 18NH6 003 1 FRONT PANEL 36 PMRAK 18NH6 004 1 AIR FILTER R 37 PMRAK 18NH6 005 1 AIR FILTER L 38 PMRAS 25YH4 939 1 LOWER COVER 39 PMRAS 25YH4 940 1 MOU...

Page 77: ...HITACHI PM NO 0355E Printed in Malaysia RAK 18NH6 RAK 25NH6 RAK 35NH6 RAK 50NH6 ...

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