Hitachi RAK-18NH6AS Service Manual Download Page 39 | Manualshive

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CIRCUIT DIAGRAM

MODEL RAK-18NH6A, RAK-25NH6A, RAK-35NH6A, RAK-50NH6A

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Summary of Contents for RAK-18NH6AS

Page 1: ...COMPONENT 34 WIRING DIAGRAM 35 CIRCUIT DIAGRAM 37 PRINTED WIRING BOARD LOCATION DIAGRAM 39 BLOCK DIAGRAM 43 BASIC MODE 45 REFRIGERATING CYCLE DIAGRAM 59 AUTO SWING FUNCTION 61 DESCRIPTION OF MAIN CIRCUIT OPERATION 62 SERVICE CALL Q A 67 PARTS LIST AND DIAGRAM 77 RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A COOLING HEATING 780 280 220 RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH...

Page 2: ...r 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 grounding terminal of the unit The ins...

Page 3: ...ing 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 1M 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 ...

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: ...OCESSOR POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A 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 ...

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Page 11: ...ITY CAUTION Before setting the switch make sure to turn OFF power supply and then set the position of the switch otherwise will cause damage to the Main PCB 1 2kW 1 8kW SWITCH POSITION CAPACITY SELECTION NOTE FACTORY default setting is at 1 8kW capacity ...

Page 12: ... cleansing lters are washable and can be use in 1 year time Type number for this air cleansing lter is SPX CFH20 Please use this number for ordering when you want to renew it Air cleansing lter should be cleaned every month or sooner if noticeable loading occurs When used overtime it may loose its deodorizing function For maximum performance it is recommended to replace it every 1 year depending o...

Page 13: ...out 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 Use this switch to start and stop when the remote controller does not work Use non conductor stick example toothpick By pressing the temporary switch the operation is done in previously set operation mode When the opera...

Page 14: ...de 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 Heating 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 ...

Page 15: ... of electric shock exists l Do not install near location where there is flammable gas The outdoor unit may catch fire if flammable gas leaks around it l Please ensure smooth flow of water when installing the drain hose CAUTION PRECAUTIONS DURING OPERATION l Avoid an extended period of direct air flow for your health W A R N I N G l Do not insert a finger a rod or other objects into the air outlet ...

Page 16: ...r will condense on the air deflector and drips down occasionally This will wet your furniture Therefore do not operate under such condition for a long time l If the amount 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 l This appliance is not intende...

Page 17: ...s Use these buttons to raise or lower the temperature setting Keep pressed and the value will change more quickly l TIME button Use this button to set and check the time and date l RESET buttons l 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 l FAN SPEED selector This determi...

Page 18: ...mer mode is set n As the settings are stored in memory in the remote controller you only have to press the START STOP button next time Press the FUNCTION selector so that the display indicates the AUTO mode of operation l When AUTO has been selected the device will automatically determine the mode of operation HEAT COOL or DEHUMIDIFY depending on the current room temperature However the mode of op...

Page 19: ...wer 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 depending on conditions Press the START STOP button Heating operation starts with a beep Press the button again to stop operation n As the settings are stored in memory in the remote controller you only have to press the START...

Page 20: ...top the indoor unit will stop emitting air as soon as the room temperature becomes lower than the setting temperature l The preset room temperature may not be reached depending on the number of people present in the room or other room conditions 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...

Page 21: ...W Fan speed slower SILENT Fan speed ultra 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 temperatu...

Page 22: ...n starts to run at HI speed l 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 indoor unit at the end of summer...

Page 23: ...imer and ON OFF timer ON Timer Time l The device will turn on at the designated times TIME OFF TIMER ON TIMER RESERVE CANCEL AM PM STOP Start AM Start Stop AM Start Stop PM PM AM PM 1 Press the OFF TIMER button The OFF mark blinks on the display 3 Press the ON TIMER button so that the OFF mark lights and the ON mark blinks 1 Press the ON OFF button so that the OFF mark blinks 2 Set the turn off ti...

Page 24: ...rol 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 of flashing and the RESERVED sign lights A beep occurs and the TIMER lamp lights on the indoor unit 2Set the turn on time with the TIMER control button Example The device will turn off at 10 30 p m and it will be turned on at 7 00 a m The settings of...

Page 25: ...yed on the remote controller 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 s...

Page 26: ...s of batteries together 2 Take out the batteries when you do not use the remote controller for 2 or 3 months CAUTION CIRCUIT BREAKER When you do not use the room air conditioner set the circuit breaker to OFF TEMPORARY SWITCH If the remote controller does not work due to battery failure press this switch to start and stop operation This temporary operation will be at the setting made most recently...

Page 27: ...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 28: ...achieved When the indoor unit is not to be 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 Electrica...

Page 29: ... filters push the front panel at three arrow portion as shown in figure and close it 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 filter as it may cause damage to the structure NOTE In case of removing the air cleansing filters please follow the above proc...

Page 30: ...ir filter and air cleans ing filter using vacuum cleaner If there is too much dust air filter only rinse under running tap water and gently brush it with soft bristle brush Allow filters to dry in shade 3 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 ...

Page 31: ...to hold the 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...

Page 32: ...or unstable Is the plug of power line firmly plugged into the socket Please ensure no loose contact between them Cleaning and maintenance must be carried out only by qualified service personal Before cleaning stop operation and switch off the power supply CAUTION Confirm 3 MAINTENANCE AT BEGINNING OF LONG OFF PERIOD Running the unit setting the operation mode to FAN and the fan speed to HI for abo...

Page 33: ... 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 contact your sales agent immediately if the air conditioner still fails to operate normally after the above inspections Inform your agent of the model of your unit production...

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Page 35: ... 50NH6A THERMOSTAT MODEL 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 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A 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 BLA...

Page 36: ... 35 WIRING DIAGRAM MODEL RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A INDOOR UNIT ...

Page 37: ...pen Door shut Door open Door shut Door open Door shut P21 P23 P22 Input Off timer Sleep Start stop Start stop Operation mode select Auto swing P25 On timer Time setting Fan speed selection Fan speed selection P26 Reservation Hour up Temperature up Auto swing P27 Cancel Hour down Temperature down P28 ...

Page 38: ...PRINTED WIRING BOARD LOCATION DIAGRAM MODEL RAK 18NH6AS RAK 18NH6A 39 ...

Page 39: ...CIRCUIT DIAGRAM MODEL RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A 41 ...

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Page 41: ...or 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 dehu midify 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 speed ...

Page 42: ...700 min 1 700 min 1 184 FWS_M 720 min 1 720 min 1 750 min 1 820 min 1 820 min 1 185 FWKAF_M 800 min 1 840 min 1 850 min 1 920 min 1 920 min 1 186 FWL_M 750 min 1 840 min 1 850 min 1 920 min 1 920 min 1 187 FWAH_M 800 min 1 940 min 1 1050 min 1 1120 min 1 1120 min 1 188 FWH_M 800 min 1 940 min 1 1050 min 1 1120 min 1 1120 min 1 18A FWHH_M 1030 min 1 1030 min 1 1170 min 1 1250 min 1 1250 min 1 18B F...

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Page 45: ... 53 Dehumidifying Dehumidifying Sleep Operation ...

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Page 48: ... 59 REFRIGERATING CYCLE DIAGRAM RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A ...

Page 49: ... 60 REFRIGERATING CYCLE DIAGRAM RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A ...

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Page 55: ...ROM and sets the preheating activation value and the rating and maximum speed of the compressor etc to their initial values Fig 8 1 SW2 will act as a program selector for IDR 2kW and 1 8kW When switch is turn to position 1 8kW IC401 will be selected as 1 8kW mode When switch is turn to position 1 2kW IC402 will be selected as 1 2kW mode ...

Page 56: ... 67 MODEL RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A ...

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Page 59: ... 70 RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A 2 sec 2 sec 2 sec 2 sec 2 sec 2 sec 2 sec 0 35 0 35 connecting cable ...

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Page 64: ... 75 RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A ...

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Page 66: ... 77 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A ...

Page 67: ...S 25YH4 S17 1 TERMINAL BOARD 2P 18 PMRAS 260GHA R01 1 THERMISTOR ASSEMBLY 20 PMRAK 18NH6AS R01 1 P W B MAIN RECEIVER 25 PMRAS 25YH4 S26 1 DRAIN PAN ASSY 28 PMRAS 25YH4 S29 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 950 1 LOWER COVER 39 PMRAS 25YH4 S40 1 MOUNTING PLA...

Page 68: ...S 25YH4 S17 1 TERMINAL BOARD 2P 18 PMRAS 260GHA R01 1 THERMISTOR ASSEMBLY 20 PMRAK 18NH6A R01 1 P W B MAIN RECEIVER 25 PMRAS 25YH4 S26 1 DRAIN PAN ASSY 28 PMRAS 25YH4 S29 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 950 1 LOWER COVER 39 PMRAS 25YH4 S40 1 MOUNTING PLAT...

Page 69: ...S 25YH4 917 1 TERMINAL BOARD 2P 18 PMRAS 260GHA R01 1 THERMISTOR ASSEMBLY 20 PMRAK 25NH6A R01 1 P W B MAIN RECEIVER 25 PMRAS 25YH4 S26 1 DRAIN PAN ASSY 28 PMRAS 25YH4 S29 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 950 1 LOWER COVER 39 PMRAS 25YH4 S40 1 MOUNTING PLAT...

Page 70: ...S 25YH4 S17 1 TERMINAL BOARD 2P 18 PMRAS 260GHA R01 1 THERMISTOR ASSEMBLY 20 PMRAK 35NH6A R01 1 P W B MAIN RECEIVER 25 PMRAS 25YH4 S26 1 DRAIN PAN ASSY 28 PMRAS 25YH4 S29 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 950 1 LOWER COVER 39 PMRAS 25YH4 S40 1 MOUNTING PLAT...

Page 71: ...S 25YH4 S17 1 TERMINAL BOARD 2P 18 PMRAS 260GHA R01 1 THERMISTOR ASSEMBLY 20 PMRAK 50NH6A R01 1 P W B MAIN RECEIVER 25 PMRAS 25YH4 S26 1 DRAIN PAN ASSY 28 PMRAS 25YH4 S29 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 950 1 LOWER COVER 39 PMRAS 25YH4 S40 1 MOUNTING PLAT...

Page 72: ...HITACHI PM NO 0489E Printed in Malaysia RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A ...

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