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RAK-18NH6AS SERVICE MANUAL RAK

Contents

1. XH3P Top CN 8 z i 12V 1 CN10 2 E XA 6P Top O 3 9 9 9 0 o Qf 9 6 L101 ICP2 dz Indoor aie 35V diri o Fan Motor aSa m 1 1 DIN f CE t 4 ICP1 v 3 amp 3 E R114 E Q115 ais E f T Gy xe 5 15 5 1 ME S ah Ta Note i I ec ALL i 1T e of Capaci
2. 3 Attaching the air cleansing filters to the filter e Attach the air cleansing filters to the frame by gently compress its both sides and release after insertion into filter frame Claws 4 places A CAUTION Do not bend the air cleansing filter as it may cause damage to the structure 4 Attach the filters e Attach the filters by ensuring that the surface written FRONT is facing front o After attaching the filters push the front panel at three arrow portion as shown in figure and close it NOTE o In case of removing the air cleansing filters please follow the above procedures e 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 e Do not operate the air conditioner without filter Dust may enter the air conditioner and fault may occur 28 r MAINTENANCE lt A CAUTION Cleaning and maintenance must be carried out only by qualified service personal Before cleaning stop operation and switch off the power supply 1 AIR FILTER N the filter following the procedure below PROCEDURE 1 Open the front panel and remove the filter e Gently lift and remove the air cleansing filter
3. elles i 1210 N opty zn uod abieug 8 uoiun m 8 6 YUN 100pu SE 99 ABUIENS 0 G gt D 5690 A CD 5690 5690 5690 Lele Leo 5590 Lele i O 5 yue uonong 6610 Hun 19919 6 2 LY sossaidwiog Bunsolyop BulAyipiuuinyap Buljoon VIHNOS IVE VIHNSE IVE V9HNS2IVH V9HN8L 4VH SV9OHN8L MVH INVHOVIG 3410943 SNILVH3OIHd3H 59 JaBueyoxe jeeu 100pu 5690 5690 R JOUeAS ASAA rfl 210 5590 seBueyoxe DUIS eowes JA SS i uoisuedxe 211199 1891 1o0pu 13 jeureng leureAS A 5590 U TE a 1 5 96 i 9590 S w t uoiun lt H m aoe aie Gn H SAJEN 7 i maS A 5590 uoisuedxa ouje 3 Kp 216 19UENS 20 60 O em aja 2 1 uod 961eyn 18 6 uoun 1810 papus a 6uis 9 8 Di i 46216 J US TS 690 Lolo i aS H A z t uod efeuj w e uoiun J Br 18 6 Lee LS sossaidwioy yue uopong BuneoH yun 1 VIHNOS AVH VIHNST NVH V9HN81 4VH SVIHNEL NVH INVHOVIG 3410943 SNIAVH3OIH33H
4. 5V ND e To To oloja 1 gt 1 885ET REMOTE CONTROL ID SELECT pyyj 2 fe 9 2 SDA SCL RES Display V R510 Sl tx RX O o C524 gt afes LINK sss 11e TE K PC912 n4 6 TX e 4 id m 9e 1C501 AX 7X20 owen ut Esso MC Le Y 5y PH 12P TOP ze 10 sar mou amp por mne oras dl ov ov I 4 F Er z FILTER 38 l 5y Ln gs5 osc E dui R513 5V12V 0508 gt l L Nec SEIN rry d gt CN OV M2 O gt B Cell Sf d so WIRELESS INPUT a pam rr rm CZ 12P Top T E 5 Room Temp l amp PTOA a ali Sam ROTATION NO m EIE BE d mie M 5 Q141 Test A 5 V 5 V 5V Dj ij 8 irae Egg amp 5 SP Mf seis 02 o A lt lh leel 5 14 ve Est 8 y SIEIS Ses Terminal for EEPROM pg mate mu Tele Pel fe lle jeita lal IE OO B zie dicat C1C2 o K oso nm eee e eim IBI z data writing 5 5 4 ap A SSS 2 E m Ov R141 a e la a le les la Je B B e o J x z 3 s s E E E si OO SDA 4 MA 4 Tet O 11 18 19 Ro pi Ee 3 24 s Re Ra Es 9 59 Bi B2 gt Y mE Vy Y Y Y Y Y Y SCL 3 se XA 9 x 3 TEH B R767 Vour Sensor REB 5 V R402 ea N Sin oct 3 i cod eo oo 7 6 amp Unit 9 oF etes R766 LD202 Timer E IRR ov D f 1C521 0521 Ps e stn 5 7 9 1 k GND pera lon a T z OOOG 5 8
5. Maximum speed WBEMAX Compressor speed Notes 1 The sleep operation starts when the sleep key is pressed 2 When the sleep key is set the maximum compressor speed is limited to WBEMAX and the indoor fan is set to Sleep Silent FWSOY If the operation mode is changed during sleep operation the changed operation mode is set and sleep control starts The indoor fan speed does not change even when the fan speed mode is changed Lo When defrosting is to be set during sleep operation defrosting is engaged and sleep operation is restored after defrosting When operation is stopped during sleep operation the set temperature when stopped as well as the time continue to be counted If the set time is changed during sleep operation all data including set temperature time etc is cleared and restarted If sleep operation is cancelled by the cancel key or sleep key all data is cleared There is no preset temperature shift due to time elapse NOTE 1 Referto the PWRITE ZU data for the constants expressed by capital alphabet letters in the drawing Z7 Jobueudxa ON BA uoisuedxe 9114993 JeudlS JUIS Lt z 60 1210 yeay 100pu 9590 uh L uoiun n JoBueuoxe papua a Buis 3 yeay 100pu i JV lt MOJ L N 210 2s 60 f US H 12 1 uod 96169 EN PUS 9 8
6. 60 SNIZIIVLLINI SH3INOO238 ANY ONISNIMS dOLS ONIONIMS NIYNA AGOW HOV JO ONIZITVYILINI dOlS AGOW HOVI NOILV amp 3dO SNIadna NOILVH3dO JO 39NVHO LXAN LV 3ZITVILINI AYVMAn GYVMNMOG D 4801031434 HIY 9NISO19 SNIMS 3NO ONIZITVILINI ONIYNG ONIONIMS ONIN dOlS AGOW HOVI NOILV amp 3dO ONIaNa AAO HOLIMS NIVIN QuvMNMOG D 3ZITVILINI ONIMS 3NO ONIHNA dOlS JGOLVINODUIID LWAH ayuvMdn AYYMNMOoa D 3ZIVILINI ONIMS 3NO ONIHNA dOlS AHA 1009 NO HOLIMS NIV dOLS ANVYOdNAL ONINNG GALLINSNVYL SI IQNVAWOO ONIMS 4 Q33V319 SI IAOW ONIMS AUMAVAOdANAL ONIONIMS dOLS ONIONIMS ONIN NIVOV ONIMS LYVLS dOLS UOLVINDUID 19 OLNV AHA OLNV NOILVH3dO ONI4NA 440 TIYNYIJINI NO OWYSHL NO TVNSA3ANID NO OWYSHL LNAWOW JHL LV dOLS SNISNIMS ONI4NA QHVMNMOG quvMdn Qu vMNMoOG D ONIDNIMS LYVIS HOLVINDUID 1V3H 19 OLNV LNAWOW JHL LY dOLS ONIONIMS NIYNA QNHVMNMOG auvMdn QNvMNMOG D ONIONIMS LYVLS AHA AHA OLNV 1009 1009 OLNV ONI4NA LNAWOW JHL LY dOLS ONIMS 3NO ONIHNA NOILVH3dO LXAN LV 3ZNVILINI quvMdn QHvMNMOG D 801031430 NIV ONISOTO ONIMS 3NO dOlS AGOW HOVI LAdNI A3M JONIHIIIJY
7. Hoeooo ol gt ae O O Ou O SWITCH POSITION CAPACITY SELECTION 1 24 D 19 1 2kw 1 20 1 8kw NOTE FACTORY default setting is at 1 8kW capacity SENES NAMES AND FUNCTIONS OF EACH PART INDOOR UNIT Air filter To prevent dust from coming into the indoor unit Refer Instruction manual Front panel Indoor unit indicators Light indicator showing the operating condition Refer page 12 Horizontal deflector Vertical deflector Air Outlet Remote controller Send out operation signal to the indoor unit So as to operate the whole unit Refer Instruction manual o Air cleansing filters are washable and can be use in 1 year time Type number for this air cleansing filter is lt SPX CFH20 gt Please use this number for ordering when you want to renew it e Air cleansing filter 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 on application requirements MODEL NAME AND DIMENSIONS WIDTH mm HEIGHT mmm 780 280 220 RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A Si INDOOR UNIT INDICATORS dH O 0 TEMPORARY SWITCH 000000 000000 OPERATION
8. R514 R911 R518 R913 2K R520 10K A E R915 R765 R766 R524 Circuit s Symbol J114 Use J115 J117 Over i rcuit s Model Rati 8 Symbol ode Current ICP1 CCP2E 20 c 12 7K Use AS PTZ20A es DTC114EE TL RLZ6 8A RD5 6UJN2 L Circuit s Symbol iar RREL 4587 1cP2 CCP2E 50 20A 20141 Connector Circuit s Symbol cw1 PH 2P Top CN2 CZ 12P Top p ur ese TH CN10 XA 6P Top PC911 TLP421 TP1 BL C PC912 TLP421 TP1 BL C DISPLAY PWB 39 CIRCUIT DIAGRAM MODEL RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A
9. 1 The sleep operation starts when the sleep key is pressed When the sleep key is set the indoor fan is set to sleep silent FDOY M or AFDOY The indoor fan speed does not change even when the fan speed mode is changed Compressor If the set time is changed during sleep operation all data including set temperature time etc is cleared and restarted If sleep operation is canceled by the cancel key or sleep key all data is cleared If the position of air deflector is being operated using remote control the operation will be performed at any desired position of air deflector Notes 1 If the room temperature is cooling preset temperature 1 33 C or less after 30 seconds from starting the operation the operation is done assuming as the preset temperature room temperature at the time 2 C 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 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 The compressor is operated forcedly for 3 minutes after operation is started The minimum ON time and OFF time of the compressor are 3 minutes 53 Table 3 ATCMAX Temperature Calculated difference compressor rpm 1 66 2265 min 2435 min 2600 min 2765 min T t t fi d in 1 dehumidtying value set by endis 2935 min control 4 3100 min
10. 5600 min 5765 min 5935 min 6100 min 6265 min 6435 min 6600 min 6765 min 6935 min 49 New Cool Rhythm Cooling Sleep Operation Room temperature Final set temperature Minimum Minimum Minimum Minimum idi Example 2 25 C or more after 6 shifts 5min 5min Minimum 5min 5min 5min 5min 5min 5min Minimum 5min 5min 5min Cooling dehumiditying set Example 1 Limited to 28 C lt gt lt gt lt gt lt gt lt gt pela temperature sleep shift Example 3 25 C is not reached after 6 shifts Final set temperature 28 C shift upper limit 0 66 C Cooling dehumidifying set temperature temperature set by remote OR N Y Cooling dehumidifying set 1 5hr 2 5hr control 4 SHIFTC 8 temperature Remote control set rr temperature SHIFTC 3hr Y Set to 7 hours j x V ERE Set temperature during rhythm e Sleep key S 1 33 C 6 gt temperature set by remote control SFTRZM Operation lamp M Timer lamp Thermo judgment Thermo OFFI Indoor fan Hi ed See basic operation 1 cycle Lo sleep Hi Outdoor fan Lo A y Rhythm Med lt See basic operation I ETR mmn Horizontal air su i deflector Med Horizontal Indoor fan New cool rhythm Outdoor fan Lo H45 sec
11. PMRAK 25NH6 PIPE SUPPORT PMRAS 25YH4 PMRAS 25YH4 SPRING TERMINAL BOARD 2P PMRAS 260GHA R01 THERMISTOR ASSEMBLY PMRAK 25NH6A P W B MAIN amp RECEIVER PMRAS 25YH4 26 DRAIN PAN ASSY PMRAS 25YH4 29 AUTO SWEEP MOTOR PMRAK 18NH6 002 FRONT COVER ASSEMBLY PMRAK 18NH6 003 FRONT PANEL PMRAK 18NH6 004 AIR FILTER R PMRAK 18NH6 005 AIR FILTER L PMRAS 25YH4 950 LOWER COVER PMRAS 25YH4 40 MOUNTING PLATE PMRAS 10C3M 003 REMOTE CONTROL SUPPORT PMRAK 18NH6A R02 REMOTE CONTROL ASSEMBLY 80 MODEL RAK 35NH6A PART RAK 35NH6A PMRAS 07GH4 Q TY UNIT PARTS NAME CABINET PMRAS 25YH4 FAN MOTOR PMRAS 260GA PMRAS 25YH4 TANGENTIAL AIR FLOW FAN FAN SUPPORT ASSEMBLY PMRAS 25YH4 FAN COVER PMRAS 25YH4 PMRAK 25NH5 FAN MOTOR SUPPORT CYCLE ASSY PMRAK 25NH6 PIPE SUPPORT PMRAS 25YH4 SPRING PMRAS 25YH4 TERMINAL BOARD 2P PMRAS 260GHA THERMISTOR ASSEMBLY PMRAK 35NH6A PMRAS 25YH4 P W B MAIN amp RECEIVER DRAIN PAN ASSY PMRAS 25YH4 AUTO SWEEP MOTOR PMRAK 18NH6 PMRAK 18NH6 FRONT COVER ASSEMBLY FRONT PANEL PMRAK 18NH6 AIR FILTER R PMRAK 18NH6 PMRAS 25YH4 AIR FILTER L LOWER COVER PMRAS 25YH4 MOUNTING PLATE PMRAS 1003M PMRAK 18NH6A REMOTE CONTROL SUP
12. Replace the microcomputer and 10MHz at pin 40 1 being p E generated normally Yes Replace the control P W B Perform final operation check eque 2 Only indoor fan does not operate other is normal Yes Yes Can the fan be stopped by The microcomputer fan PWM remote control output pin is Hi D No Replace the Replace the indoor fan motor Replace the No Perform final operation check 3 Air deflector does not move others are normal Are pulse signals output at Replace the microcomputer pin 15 when auto swing is turned on in the fan mode JL Yes Yes Yes Is a voltage over 15V or below 10V D gt o gt being generated on the 12V line Replace IC111 Check IC711 If it is normal replace the air deflector motor Perform final operation check 4 All systems stop from several seconds to several minutes after operation is started all indicators are also off 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 Yes Check to see if shorting etc has occurred The operation lamps lights once and goes out in 5 10 seconds L in the P W B pattern g No i F Can the indoor fan be lightly turned by hand Check to see if the indoor fan is touching Switch of main power before check the chassis etc If it does repair JL Yes Replace the indoor fan motor
13. e Wipe the water thoroughly If water remains at indicators or signal receiver of indoor unit it causes trouble Method of removing the front panel Be sure to hold the front panel with both hands to detach and attach it C Removing the Front Panel D e When the front panel is fully opened with both hands push the right arm to the inside to release it and while closing the front panel slightly put it out forward e Move the projections of the left and right arms into the Flanges in the unit and securely insert them into the holes A CAUTION it as this may cause short circuit coating e Do not splash or direct water to the body of the unit when cleaning e Never use hot water above 40 benzine gasoline acid thinner or a brush because they will damage the plastic surface and the 30 A CAUTION Cleaning and maintenance must be carried out only by gualified service personal Before cleaning stop operation and switch off the power supply 3 MAINTENANCE AT BEGINNING OF LONG OFF PERIOD e Running the unit setting the operation mode to 3 EN FAN and the fan speed to HI for about half a day lt on a fine day and dry the whole of the unit e Switch off the power plug Blow U N A REGULAR INSPECTION PLEASE CHECK THE FOLLOWING POINTS BY OUALIFIED SERVICE PERSONAL EITHER EVERY H
14. from the air filter frame 2 Vacuum dust from the air 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 e 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 o After attaching the filters push the front panel at three arrow portions as shown in figure and close it Clean the air filter as it removes dust inside the room In case the air filter is full of dust the air flow will decrease and the cooling capacity will be reduced Further noise may occur Be sure to clean A CAUTION to the sun The filter may shrink electrostatic performance o Do not wash with hot water at more than 40 C The filter may shrink o When washing it shake off moisture completely and dry it in the shade do not expose it directly e Do not use detergent on the air cleansing filter as some detergent may deteriorate the filter 29 Z 2 Washable Front Panel e Remove the front panel and wash with clean water Wash it with a soft sponge After using neutral detergent wash thoroughly with clean water e When front panel is not removed wipe it with a soft dry cloth Wipe the remote controller thoroughly with a soft dry cloth
15. ii 72 5 Check the control P W B power circuit Is DC 35V being output Is ICP2 normal Replace ICP2 Check if between cathode and Normal if it is less than 1 shorting has occurred in fan anode of D101 Blown open if it is 1 or more motor circuit and 35V interface circuit If these are defective ICP2 will be open again Is ICP1 normal Replace ICP1 Check if Is DC 12V being output Normal if it is less than 1 shorting has occurred in the Blown open if it is 1 or more air deflector motor If these are defective ICP1 will be open again Replace IC111 Perform final operation check Replace REG2 Check the 5V Is DC 5V being output i gt line if the 5V line is shorted ICP1 will be open again aoe CHECKING THE REMOTE CONTROLLER Is battery polarity correct Install the battery in the correct polarity Replace the battery Is the battery check sign flashing No V Turn on an AM radio bring the remote control switch within 15 cm of the radio and press the ON OFF button V Does the radio buzz noisily Check the LED D1 with a multimeter V Check the indoor unit signal receiving P W B If itis good check the main P W B AM radio You can check the remote control switch by other methods as expl
16. us E automatically in 10 second o To check the current time setting press the TIME button twice The setting of the current time is now complete E 2sa the turn off time with the TIMER control button b 6 ly S V cd ES E 3 Point the signal window of the remote controller toward the indoor unit and press the RESERVE button The d OFF mark starts lighting instead of flashing and the sign RESERVED lights A beep occurs and the O TIMER lamp lights on the indoor unit A Ci E b Oa 11 90 a PM 5 The setting of turn off time is now complete Example The device will turn off at 11 00p m JA N 2 set the turn on time with the 3 Point the signal window of the remote controller toward the indoor unit and TIMER control button press the RESERVE button The D ON mark starts lighting instead of flashing and the RESERVED sign lights A beep occurs and the TIMER lamp lights on the indoor unit A gt G d olin i V lt JAM ne nun a e device will turn on at 7 00 a m 2 Hu b O 9 it L The setting of the turn on time is now complete J 4 Set the turn on time with the TIMER control button L3 lt C gt Le N I I Je 5 E4 N N D D 6 O ma c3 on at 7 00 a m O The settings of the turn on off times are now complete Ogg
17. y Bl 6 E N HEE 2 8 TERMINAL EEPROM g o H DATA WRITING 5V BENE 9 a MS d i s ses Q cem mem 0v LD201 OPERATION H E pi cc LD203 FILTER Eum WO a ea cUUA RX I a SW1 0 Room TEMP THERMISTOR LENT O O MET nem lel TEMPORARY SW H LINK alt bend M R211 om 0 CZ 12P SIDE BOARD IN lo 9 3 E Numerical Value Rating Current Circuit s Symbol lt 3 5 o E NJM2340M BA50COT scan BR24L04FW 1 2 C121 H R404 R531 R804 120K rz D121 155355 D401 HN1D03FU L ee BR24L04F W BR24LO4F W AX 7X20 S80942CNMC ULN2003ANS 1C801 NJM2903M T Switch EVQPO7K SW 5595912000 gt Zener Diode RD6 2UJN2 e C102 c o 02 e L201 cmi on c lole zlolsneee r o A 10121 10401 10402 10501 C4 C4 C5 C5 7 IC 1 752 1608c 10 Oo 1K R121 0111 Q112 2SC5209H Q113 2SC5209H Q115 sn 162Y R506 10K R507 10K 651 R509 R652 R824 8 25K R510 10K R653 1K c R826 z R512 Ress 10k lt Rese 1K R828 R657 Circuit s RES1 CSTLS10MHZ Buzzer W1 N 6 JW102 1 wao joa vee ezte c
18. Cool Dashed will release when i a maximum 25 minutes is lapsed and ii room temperature is lower than set temperature 3 C thermo off and iii when room temperature has achieved setting temperature 1 C then maximum Cool Dashed time will be revised to 20 minutes And iv indoor fan is set to Lo and Med fan mode and v change operation mode During Cool Dashed operation thermo off temperature is set temperature with shift value 3 C After thermo off operation continue in Fuzzy control mode Compressor minimum ON time and OFF time is 3 minutes During normal cooling mode compressor maximum rpm CMAX will maintain for 60 minutes if indoor temperature is lower than CLMXTP No time constrain if indoor temperature is higher than CLMXTP When fan is set to Hi compressor rpm will be limited to CKYMAX When fan is set to Med compressor rpm will be limited to CUKMAX When fan is set to Lo compressor rpm will be limited to CBEMAX During Cool Dashed when room temperature reaches set temperature 1 C compressor rpm is actual rpm x DWNRATEC Table 3 ATCMAX Temperature difference Calculated compressor rpm 2265 min 2435 min 2600 min 2765 min 2935 min 3100 min 3265 min 3435 min 3600 min 3765 min 3935 min 4100 min 4265 min 4435 min 4600 min 4765 min 4935 min 5100 min 5265 min 5435 min
19. NOILVOIJIO3dS ONILVAAdO HOLO3143Q NIV AGOW NOIL V33dO 1N3S3Hd V9HNOS IVH VIHNSE NVH VIHNST NVH SVeHN8LOIVH IQON NOILONNA ONIMS OLNV IVNSIS 61 DESCRIPTION OF MAIN CIRCUIT OPERATION RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A 1 Reset Circuit NORMAL HI RESET LO e 7 RES Microcomputer R552 4 LA I BT N 3 e IC521 OV Fig 1 1 Power OFF Power ON y Voltage A l Voltage supply to pin 2 of IC521 Reset release at 4 4V Reset enter at 4 2V I I voltage Voltage at pin O of microcomputer Fig 1 2 The reset circuit initializes the microcomputer program when power is ON or OFF Low voltage at pin 7 resets the microcomputer and Hi activates the microcomputer When power ON 5V voltage rises and reaches 4 4V pin T of IC521 is set to Hi At this time the microcomputer starts operation e When power OFF voltage drops and reaches 4 2V pin 1 of IC521 is set to Low This will RESET the microcomputer 62 2 Receiver Circuit 12V Q141 Vop R141 i R211 R611 J MES Q ANN ANN e 13 RECEIVER N IRR ty O O Vout SA h e e GND amp Microcomputer V OV Fig 2 1 e The ligh
20. exchanger is frosted If the air conditioner operates in cooling mode when it is Wait for 3 4 minutes cold the evaporator may get until it is defrosted frosted Normal sound when refrigerant flows in pipe Compressor may not operate when room temperature is 10 C or less It also stops when the humidity is preset humidity or less It occurs during defrost ing Wait for 5 10 minutes until the condenser is defrosted At the beginning of heating the fan speed remains LOW for 30 seconds If HIGH is selected it switches to LOW and again to MED after additional 30 seconds If temperature is high in the outdoor heating operation may stop to protect internal devices 67 AUTO FRESH DEFROSTING After the ON OFF button is pressed Auto Fresh Defrosting is carried out the to stop heating the outdoor unit is system checks the outdoor heat exchanger still working with the OPERATION and defrosts it as necessary before stopping lamp lighting operation AUTO OPERATION Fan speed does not change when fan speed selector is changed during auto operation At this point fan speed is automatic This is because Nice temperature reservation function is operating This function starts operation earlier so the preset temperature is reached at the preset time Operation may start maximum 60 minutes before the preset time When on timer has been programmed operation starts before the preset ti
21. the following phenomena may occassionally occur but they are not abnormal for the operation 1 Slight flowing 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 e 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 V e 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 number date of installation Please also inform him regarding the fault e Power supply shall be connected at the rated voltage otherwise the unit will be broken or could not reach the specified capacity je N NOTE e If the supply cord is damaged it must be replaced by the special cord obtainable at authorized service parts centers e 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 32 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A INDOOR UNIT
22. 1 The defrosting inhibit period is set as shown in the diagram below When defrosting has finished once the inhibit period is newly set based on the outdoor temperature when the compressor was started During this period the defrost signal is not accepted If the difference between the room and outdoor temperatures is large when defrosting is finished the maximum compressor speed WMAX or WMAX2 can be continued for 120 minutes maximum The defrosting period is 20 minutes maximum When operation is stopped during defrosting it is switched to auto refresh defrosting Auto refresh defrosting cannot be engaged within 15 minutes after operation is started or defrosting is finished DFTIM1 Outdoor temperature Notes 1 2 The first inhibit time after operation start is set to DFTIM1 From the second time onwards the inhibit time is set according to the time required for defrosting Reverse cycle operation time gt DEFCOL DEFTIM1 is set Reverse cycle operation time lt DEFCOL The time corresponding to outdoor tempera ture is set Heating Sleep Operation 0 5hr Set to 7 hours Sleep key Operation lamp SLEEP on the remote controller is lit Timer lamp Hi Med Indoor fan Silent N See basic Sleep operation See basic Outdoor fan Facing up Horizontal Shut Vertical air deflector
23. 3265 min 3435 min Fan speed set to auto 3600 min 3765 min Start stop switch m 3935 min Thermo judgment Thermo OFF P 4100 min 4265 min Ultra Hi N Hi 4435 min Med 4600 min Lo Ultra Lo Engaged in the set fan speed in cases other than auto fan speed 4765 min 4935 min 5100 min 5265 min 5435 min 5600 min 5765 min 5935 min 6100 min 6265 min 6435 min E 6600 min Outdoor fan J i 6935 min Reversing valve heating on mode Basic Cooling Operation Room temperature ATCMAX Indoor fan Operation lamp Rating o o o a c R s 2 5 E E o a E o o Notes 1 Condition for entering into Cool Dashed mode When fan set to Hi or Auto mode and temperature difference between indoor temperature and set temperature has a corresponding compressor rpm calculated value in Table 3 larger than WMAX Cool Dashed will release when i a maximum 25 minutes is lapsed and ii room temperature is lower than set temperature 3 C thermo off and iii when room temperature has achieved setting temperature 1 C then maximum Cool Dashed time will be revised to 20 minutes And iv indoor fan is set to Lo and Med fan mode and v change operation mode During Cool Dashed op
24. 5 Point the signal window of the remote controller toward the indoor unit and press the RESERVE button The D ON mark starts lighting instead of flashing and the RESERVED sign lights A beep occurs and the TIMER lamp lights on the indoor unit Example The device will turn off at 10 30 p m and it will be turned e The timer may be used in three ways off timer on timer and ON OFF OFF ON timer Set the current time at first because it serves as a reference e As the time settings are stored in memory in the remote controller you only have to press the I RESERVE button in order to use the same settings next time 23 HOW TO SET THE SLEEP TIMER as shown below Set the current time at first if it is not set before see the pages for setting the current time Press the SLEEP button and the display changes HITACHI SLEEP Mode Indication n Sleep timer 1 hour gt 2 hours 3 hours 7 hours Sleep timer off io J N Sleep Timer The device will continue working for the designated number of hours and then turn off Point the signal window of the remote controller toward the indoor unit and press the SLEEP button The timer information will be displayed 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 e pU Example I
25. 550 min 550 min 550 min 550 min 550 min 164 FZZY GN M 2 2 1 5 1 5 1 5 166 FZZYTM M 4 min 4 min 4 min 4 min 4 min 172 SHIFTW M 0 C 0 C 2 2 C 2 C 173 SFTSZW M 0 C 0 C 2 2 C 2 175 SHIFTC M 1 33 1 33 C 1 33 1 33 1 33 C 176 SHIFTD M 3 33 C 3 33 C 3 83 3 33 3 33 17C TEION M 2 C 2 2 2 C 2 C 17D TEIOF M 9 C 9 9 182 FWSS_M 500 min 500 min 500 min 500 min 500 min 183 FWSOY M 600 min 600 min 600 min 700 min 700 min 184 FWS M 720 min 720 min 750 min 820 min 820 min 185 FWKAF M 800 min 840 min 850 min 920 min 920 min 186 FWL M 750 min 840 min 850 min 920 min 920 min 187 FWAH_M 800 min 940 min 1050 min 1120 min 1120 min 188 FWH M 800 min 940 min 1050 min 1120 min 1120 min 18A FWHH M 1030 min 1030 min 1170 min 1250 min 1250 min 18B FCSOY M 550 min 550 min 600 min 680 min 680 min 18C FCS M 650 min 650 min 750 min 780 min 780 min 18D FCL M 680 min 740 min 870 min 950 min 950 min 18E FCAH M 700 min 850 min 980 min 1030 min 1030 min 18F FCH M 700 min 890 min 1030 min 1170 mint 1170 min 190 FCHH M 990 min 990 min 1030 min 1200 min 1200 min 191 FDOY M 600 min 600 min 600 min 680 min 680 min 192 FDS1 M 660 min 720 min 750 min 780 min 780 min 193 FDS2 M 660 min 720 min 750 min 780 min 780 min Table 1 Fan speed by mode Table 2 Room temperature shift value Operation Fan speed mod
26. Fan speed ultra slower HITACHI 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 D START STOP button Heating operation starts with a beep Press the button again to stop operation A E As the settings are stored in memory in the remote controller you only have to press the D START STOP button next time E Defrosting Defrosting will be performed about once an hour when frost forms on the heat exchange of the outdoor unit for 5 10 minutes each time During defrosting operation the operation lamp blinks in cycle of 3 seconds on and 0 5 second off The maximum time for defrosting is 20 minutes However if it is connected to multi type outdoor unit the maximum time for defrosting is 15 minutes If the piping length used is longer than usual frost will likely to form 248 DEHUMIDIFYING OPERATION Use the device for dehumidifying when the room temperature is over 16 C When it is under 15 C the dehumidifying function will not work HITACHI N Press the FUNCTION selector so that the display indicates O DEHUMIDIFY The FAN SPEED is set at LOW or SILENT Set the desired room temperature with the TEMPERATURE button the display indicates the setting A iac The range of 20 26 C is re
27. PES 1 time heating mode or it is too high in the only in the heating mode cooling mode Note The malfunction mode is entered the 3rd time this abnormal indication appears read every 3 minutes Outdoor unit forced operation Electrical parts in the outdoor unit When the outdoor unit is in forced 2 2 times operation or balancing operation after forced operation f Indoor outdoor interface defect 1 Indoor interface circuit 3 D sec stt 3 times When the interface signal from the 2 Outdoor interface circuit outdoor unit is interrupted Outdoor electrical assembly Please check at the outdoor PR 4 times defective electrical led lamp blinking LD301 4 131 131 1 and refer to self diagnosis lighting mode for outdoor unit Room thermistor or heat exchanger 1 Room thermistor thermistor is faulty 2 Heat exchanger thermistor 5 Be sec ff 9 times When room thermistor or heat exchanger thermistor is opened circuit or short circuit Over current detection at the DC fan 1 Indoor fan locked Ex motor 2 Indoor fan motor 6 TE 10 times When over current is detected at the 3 Indoor control P W B DC fan motor of the indoor unit IC401 or IC402 data reading error 401 or IC402 abnormal 7 ER 13 times when data read from 1C401 or 1C402 is incorrect Lights for 0 35 sec at interval of 0 35 sec lt Cautions gt 1 2 3 If the interface
28. PS12 ad i SEGTO Le s KEY SWITCH i Ep amu i SEG12 63 S SEG14 K i SEG15 seen i N 3417 5 3 SEG18 68 S IC1 2 i N SEG19 59 s E i SEG20 O SEGO Q i sto L Hw M38235G6 xxxHP 2 v SEG23 A N SEG24 rule uro E SEG26 CT G come mc oc Lt via i KAA ee i alai i o i j Ho i Z SOMS i zt e 5 ior E No N EN z N i 5 bo S EN POH Oe ae a N i u i gt z e Xm i x e 9 a or L u u i JA x 9 u ul Y o o a ee E ous Se 33 ws n n 2 TT A P d R 3 PRINTED WIRING BOARD LOCATION DIAGRAM MODEL RAK 18NH6AS RAK 18NH6A l MAIN P W B jka PEN jm n0 nnn jsj j d e du a E i if Ss E d XA 6P Top o L101 INDOOR FAN MOTOR O Lm Es 2 58 gt C ci ii ir LAC LE me 28 P D ne 5 TERMINAL BOARD 12N C PH 5P T sy UN XA 3P Top ja N FA g AMETE c RT lt 1 5 LEN P 0821 EPA ime 2 S 55 FOR AUTO SWEEP 16801 5V BZ 5V BUZZER CN1 se LEUR C SIEE M e A TE FAAP TOP O E E ME HEAT EXCHANGER HRIBE 5 3 5 E WIRED REMOCON THERMISTOR a SIS tle EIE g AUTO BEIE 5 KEST O or 5 z SAGO sew ky 12 z s s um sg s R642 DIOE 550 PI SP Top BLK W sa hz 5V SDA SCL RES OV RX kus OOOO N m 1C501 AX 7X20 sy PH 12P TOP 5V 42V 0v Me n CZ 12P Top ROOM TEMP 8 g 5
29. Top air suction grill 205 E Front panel a oa a aS 13 Cabinet Mounting plate Horizontal air diflector 190 400 190 70 70 Drain C F X When piping is T TT 1 T TT LZ TE drawn from the left side 1 m exchange the drain sais hose for the drain cap Drain hose Drain cap connection port About 108 About 370 rd Narrow pipe T T J X Power cord Wide pipe Connecting cable 47 si 30 le 22 ja 81 5 Vertical air deflector 33 MAIN PARTS COMPONENT THERMOSTAT Thermostat Specifications MODEL RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A THERMOSTAT MODEL OPERATION MODE INDICATION 16 7 20 0 19 16 0 20 7 TEMPERATURE 24 7 28 0 c sp INDICATION 24 24 0 28 7 INDICATION 32 7 36 0 32 32 0 36 7 FAN MOTOR Fan Motor Specifications RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A POWER SOURCE DC 5V 35V OUTPUT 25W RED BLK WHT CONNECTION YEL BLU Control circuit built in BLU BLUE YEL YELLOW BRN BROWN WHT WHITE GRY GRAY ORN ORANGE GRN GR
30. Without a circuit breaker the danger of electric shock exists e Do not install near location where there is flammable gas The outdoor unit may CAUTION catch fire if flammable gas leaks around it e Please ensure smooth flow of water when installing the drain hose e Should abnormal situation arises like burning smell please stop operating the unit and turn off the circuit breaker Contact your agent Fault short circuit or fire may occur if you continue to operate the unit under abnormal situation e Please contact your agent for maintenance Improper self maintenance may cause electric shock and fire e Please contact your agent if you need to remove and reinstall the unit Electric shock or fire may occur if you remove and reinstall the unit yourself improperly elf the supply cord is damaged it must be replaced by the special cord obtainable at authorized service parts centers PRECAUTIONS DURING OPERATION e Avoid an extended period of direct air flow for your health e Do not insert a finger a rod or other objects into the air outlet or inlet As the fan is rotating at a high speed it will cause injury Before cleaning be sure to stop the operation and turn the breaker OFF e Do not use any conductor as fuse wire this could cause fatal accident ozZ zZ7 gt 2 e 8 e During thunder storm disconnect and turn off the circuit breaker La PRECAUTIONS DURING OPERATI
31. angle of horizontal air deflectors Table 4 1 Auto sweep Motor Rotation pe Rotation angle per step Time per step ms Horizontal air deflectors 0 0882 64 5 Room Temperature Thermistor Circuit e Fig 5 1 shows the room temperature e The voltage at depends on the room thermistor circuit temperature as shown in Fig 5 2 5V Room temperature thermistor Room temp input Voltage at V 0 10 20 30 40 Room temperature C Fig 5 2 6 Heat exchanger temperature thermistor circuit 5V Heat exchanger temperature thermistor R306 Microcomputer Heat exchanger temperature input Fig 6 1 e The circuit detects the indoor heat n M exchanger temperature and controls the following 1 Preheating 2 Low temperature defrosting during cooling and dehumidifying operation Voltage at V 3 Detection of the reversing valve non operation or heat exchanger temperature thermistor open The voltage at depends on the heat exchanger temperature as shown in Fig 6 2 10 0 10 20 30 40 Heat exchanger temperature C Fig 6 2 65 7 Initial Setting Circuit 16401 e When power is supplied the microcomputer reads the data in IC401 E PROM and sets the preheating activation value and the rating and maximum speed of the compressor etc to their initial values e Data
32. are inserted into the remote controller the unit will initially reguire approximately 10 seconds to respond to commands and operate HITACHI Foe pcs HITACHI TIETO mE e a M D 3 amp t AUTO HEAT DEHUMIDIFY 9 Signal emitting window transmission sign Point this window toward the indoor unit when controlling it The transmission sign blinks when a signal is sent Display This indicates the room temperature selected current time timer status function and intensity of circulation selected START STOP button Press this button to start operation Press it again to stop operation SLEEP button Use this button to set the sleep timer TEMPERATURE 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 A AUTO to HEAT to DEHUMIDIFY to z amp COOL and to FAN cyclically FAN SPEED selector This determines the fan speed Every time you press this button the intensity of circulation will change from amp AUTO to E HI to E MED to amp LOW to B SILENT This button allows selecting the optimal or preferred fan speed for eac
33. circuit is faulty when power is supplied the self diagnosis display will not be displayed If the indoor unit does not operate at all check to see if the connecting cable disconnected is connected or To check operation again when the timer lamp is blinking you can use the remote control for operation except for mode mark X1 70 CHECKING INDOOR UNIT ELECTRICAL PARTS 1 Power does not come on no operation No Is DC 35V being generated between Is AC 220 240V AC being generated Check AC outlet and breaker and repair any defective part between terminals L and N on the outdoor unit terminal board terminals C and D on the terminal board Is DC 35V being generated between Check the indoor outdoor unit terminals C and D on the outdoor connection cable and correct any unit terminal board defective section wrong connection incomplete insertion reversed No Are control voltages 12V 5V Check according to the proper method being generated normally for checking the power circuit Check the outdoor unit power circuit and repair the defective section Yes Do the air deflectors perform initial Yes Check the indication P W B operation when the power supply is sa connection cord and light receiving turned on and off unit No Is the microcomputer reset input Check the reset circuit and repair pin 2 Hi any defective section Yes Is the microcomputer clock signal No
34. does not start if the temperature setting is m As the settings are stored in memory in the remote controller you only have to press the D START STOP button next time Set the desired FAN SPEED with the FAN SPEED button the display indicates the setting AUTO The FAN SPEED is HI at first and varies to MED or LOW automatically when the preset temperature has been reached SI Hi Economical as the room will become cool quickly MED Fan speed slow LOW Fan speed slower N a 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 higher than the current room temperature even though the OPERATION lamp lights The cooling function will start as soon as you set the temperature below the current room temperature 790 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 Press the FUNCTION selector so that the display indicates FAN Press the FAN SPEED button HI The strongest air blow MED Fan speed slow LOW Fan speed sl
35. of self diagnosis mode is stored in IC401 data will not be erased even when power is turned off 5V 1 Microcomputer J SGL External ROM 4 6 SDA 401 E PROM oV Fig 7 1 8 Initial Setting Circuit IC401 For RAK 18NH6AS only e When power is supplied the microcomputer reads the data in IC401 and IC402 E PROM and sets the preheating activation value and the rating and maximum speed of the compressor etc to their initial values 5V BV 5V GA 401 S 5 Microcomputer 1 8KW ROM 6 ay 1 Ej amp scl au e 15 SDA External ROM 5V 5V in zz 404 1 8 CE i A o O 0408 b 8 gt ov Yov sw2 vasta 1 2KW ROM TA ov ov 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 66 SERVICE CALL Q amp A MODEL RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A COOLING MODE The compressor has stopped suddenly during cooling operation Sound of running water is heard from indoor unit during dehumidifying Compressor occasionally does not operate during dehumidifying The circulation stops occasionally during Heating mode When the fan speed is set at HIGH or MED the flow is actually Weak Heating operation stops while the temperature is preset at 30 Check if the indoor heat
36. 0 8 X Do not use thin pipes thinner than 0 7 mm Projection A mm for Flare Tool for R410A 2 Flare s Expansion Pipe Clutch Type The projection when the new flare tool is used is as follows When using the conventional flare tool be sure to secure the following projection 1 4 0 0 5 by using a gauge for projection 1 2 0 0 5 adjustment When using the conventional flare tool use a gauge for projection adjustment f Nominal Opposite Side Dimensions mm 3 Flare Nut Dimensions diameter of Flare Nuts for R410A Along with changes in the expansion pipe dimensions the opposite side 1 4 17 17 dimensions of flare nuts whose nominal diameter is 1 2 change so 3 8 22 22 that different torque wrenches must be used 1 2 26 24 X Figures in denote those for HCFC 22 3 Servicing Tools Changes in the Product and Components elin order to prevent any other refirigerant from being charged R410A model is provided with the outdoor unit whose control valve has a different service port diameter port size 7 16 UNF 20 threads per inch 1 2 UNF 20 threads per inch n order to secure larger pressure resisting strength flare expansion pipe dimensions and flare nut dimensions have been changed New Tools for R410A New tools for R410A Applicable to HCFC 22 Model Changes Gauge manifold As pressure is high it is impossible to measure by means of conventional gauge In o
37. 10A model 2 It is necessary to exercise more care to prevent the foreign matters oil moisture etc from mixing into the piping than in the case of HCFC 22 model Also when storing the piping securely seal its openings with pinching and taping etc 3 Be sure to charge the refrigerant from the liquid phase side as the liquid phase gas phase composition changes a little in the case of R410A model 4 Never use refrigerant other than R410A in an air conditioner which is designed to operate with R410A 5 If a refrigeration gas leakage occurs during servicing be sure to ventilate fully If the refrigerant gas comes into contact with fire a poisonous gas may occur 6 When installing or removing an air conditioner do not allow air or moisture to remain in the refrigeration cycle Otherwise pressure in the refrigeration cycle may become abnormally high so that a rupture or personal injury may be caused 7 After completion of service work check to make sure that there is no refrigeration gas leakage If the refrigerant gas leaks into the room coming into contact with fire in the fandriven heater space heater etc a poisonous gas may occur 2 Refrigerant Piping Materials 1 Thickness of Refrigerant Piping Although the thickness is same as that for HCFC 22 model as R410A a Pics Eli cines model features higher pressure be lameter iameter mm mm sure to confirm the thickness prior to 1 4 6 35 08 use 1 2 12 70
38. 5W FAN MOTOR CAPACITOR NO FAN MOTOR PROTECTOR NO COMPRESSOR COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR OVERHEAT PROTECTOR FUSE for MICROPROCESSOR POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL REFRIGERANT CHARGING UNIT VOLUME Refrigerant 410A WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE FEATURES 1 NEW REFRIGERANT 1 New refrigerant R410A with no harmful effect on the ozone layer Refrigerant R410A which does not damage the ozone layer was adopted instead of HCFC 22 which is planned to be phased out globally by 2020 2 New refrigerating oil The new refrigerant HFC R410A is not compatible with conventional mineral oils and no lubrication can be expected with those oils To solve this the artificial synthetic ester oil is newly adopted NEW TECHNOLOGY Cautions in relation to HFC R410A 1 Safety during Servicing This air conditioner uses the new refrigerant HFC R410A for protecting the ozone layer R410A has several different characteristic features from HCFC 22 Therefore keep the following care items during servicing for safety 1 Since the working pressure of R410A model is about 1 6 times higher than that of HCFC 22 models it becomes necessary to use part of piping materials and servicing tools exclusive for R4
39. 74 188355 Thermistor C C ICP1 CCP2E 20 0 8A 103 ICP2 CCP2E 50 2 0A 104 Circuit s Numerical Rating D z Valva H Current a Symbol 824 Circuit s Model D Symbol E PH 2P Top 116 CZ 12P Top Liii seoz 61 12p 1de BLN1148018 XA 3P Top PH 5P Top 16086J PH 12P Top RN5VD42C PA 6P Top ULN2003ANS PA 4P TOP XA 6P Top 100 4 BLO1RN141714 Circuit s Symbol E BLO1RN1A1714 Circuit s Symbol PC911 LP42i TPi BL Circuit s Model Symbol Jui s mn Yoon Temp hiit RREL4 58 127 pH PC912 TLP421 TP1 BL 41 BLOCK DIAGRAM MODEL RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A LCD wireless circuit Wireless receive Heat exchanger thermistor Temporary switch gt Initial setting circuit gt Reset circuit m Optional parts m Wired remote control circuit Wired remote control receive Weekly Timer Room temperature thermistor Indoor microcomputer AX 7X20 m gt Buzzer circuit Filter gt Indicating lamp Operation Timer Auto sweep motor for Air de
40. ALF YEARLY OR YEARLY CONTACT YOUR SALES AGENT OR SERVICE SHOP N 1 Q Is the earth line disconnected or broken F Is the mounting frame seriously affected by rust and is the outdoor unit tilted or unstable b il Is the plug of power line firmly plugged into the socket 3 e Please ensure no loose contact between them 31 AFTER SALE SERVICE AND WARRANTY WHEN ASKING FOR SERVICE CHECK THE FOLLOWING POINTS ka CONDITION CHECK THE FOLLOWING POINTS If the remote controller is not transmitting a signal e Do the batteries need replacement e ls the polarity of the inserted batteries correct Remote controller dis play is dim or blank e 5 the fuse all right e Is the voltage extremely high or low When it does not operate e Is the circuit breaker ON e 5 the setting of operation mode different from other indoor units e ls the air filter blocked with dust e Does sunlight fall directly on the outdoor unit e Is the air flow of the outdoor unit obstructed When it does not cool well i When it does not hot well o Are the doors or windows opened or is there any source of heat in the room o Is the set temperature suitable o Are the air inlets or air outlets of indoor and outdoor units blocked e Is the fan speed LOW or SILENT ya N S p Notes e In quiet operation or stopping the operation
41. EEN RED RED BLK BLACK PNK PINK VIO VIOLET 34 WIRING DIAGRAM MODEL RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A INDOOR UNIT WIRED REMOTE CONTROL WEEKLY TIMER CONNECTING CORD TERMINAL pq so G oj FROM OUTDOOR UNIT BOARD EE Ean xi M BROWN i C BROWN m MOTOR RED D RED EDO 0 em P W B MAIN oN O INDOOR YELLOW GRAY S EEPROTEST THERMISTOR 5 annissa 123456789 t2 1 23 4 5 6 N IRELESS 000000000 000 O O 0 IREMOTE CONTROLLERI 12 LINES pus INDOOR ROOM Receiver TEMPERATURE 35 N THERMISTOR CIRCUIT DIAGRAM Remote Control P25 P26 P27 P28 TRANSMITION Input OUTPUT P21 Door open Off timer On timer Reservation Cancel N i Door shut Sleep E E i P22 Door open Start stop Time setting Hour up Hour down am a i Door shut Start stop Fan speed selection Temperature up Temperature down x EN M 3 39 i P23 Door open Operation mode select Fan speed selection Auto swing v n3 1 8 3 30 i Door shut Auto swing M i o 1 NO i ON 5 i N SEG7 i W SEG8 i SEG9 PS1
42. HITACHI Inspire the Next RAK 18NH6AS RAK 18NH6A SERVICE MANUAL RAK 25NH6A TECHNICAL INFORMATION RAK 35NH6A FOR SERVICE PERSONNEL ONLY MAR SONNGA REFER TO THE FOUNDATION MANUAL HITACHI CONTENTS SPECIFICATIONS 5 HOW TO aree 11 CONSTRUCTION AND DIMENSIONAL DIAGRAM 33 MAIN PARTS COMPONENT 34 RAK 18NH6AS WIRING DIAGRAM 35 RAK 18NH6A RAK 25NH6A CIRCUIT DIAGRAM 37 RAK 35NH6A PRINTED WIRING BOARD LOCATION DIAGRAM 39 RAK 50NH6A BLOCK DIAGRAM san 43 BAGIC MODE Sti aceite 45 NOTE REFRIGERATING CYCLE 59 This manual describes only points that differ from RAF 25 35NH5 RAD 25 35NH5 RAI 25 35NH5 and AUTO SWING el RAM 55QH5 PM No 0312E for items not described DESCRIPTION OF MAIN CIRCUIT OPERATION 62 in this manual SERVICE CALL G 67 PARTS LIST AND DIAGRAM 77 SPECIFICATIONS DC INVERTER WALL TYPE INDOOR UNIT MODEL RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A POWER SOURCE 19 50 60Hz 220 240V TOTAL INPUT TOTAL AMPERES TYPE COOLING CAPACITY REFE
43. INDICATOR TEMPORARY SWITCH FILTER LAMP When the device is operated for a total of about 200 hours the FILTER lamp lights to indicate that it is time to clean the filter OPERATION LAMP This lamp lights during operation The OPERATION LAMP flashes in the following cases during heating 1 During preheating For about 2 3 minutes after starting up 2 During defrosting Defrosting will be performed 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 AN Temporary Switch S pad X Non conductor Stick C gt ee SWITCH 000000 000000 Use this switch to start and stop when the remote controller does not work Use non conductor stick example toothpick e By pressing the temporary switch the operation is done in previously set operation mode e When the operation is done using the temporary switch after the power source is turned off and turn on again the operation is done in automatic mode 12 Note e 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 n Dry bulb C Wet bulb C n Dry bulb C Wet bulb C SAFET
44. ON e The product shall be operated under the manufacturer specification and not for any other intended use e Do not attempt to operate the unit with wet hands this could cause fatal accident 1199 e When operating the unit with burning equipments regularly ventilate the 0 room to avoid oxygen insufficiency d e Do not direct the cool air coming out from the air conditioner panel to face household heating apparatus as this may affect the working of apparatus such as the electric kettle oven etc e Please ensure that outdoor mounting frame is always stable firm and without defect If not the outdoor unit may collapse and cause danger e Do not splash or direct water to the body of the unit when cleaning it as this may cause short circuit e Do not use any aerosol or hair sprays near the indoor unit This chemical can adhere on heat exchanger fin and blocked the evaporation water flow to drain pan The water will drop on tangential fan and cause water splashing out from indoor unit O e Please switch off the unit and turn off the circuit breaker during cleaning the high speed fan inside the unit may cause danger e Turn off the circuit breaker if the unit is not to be operated for a long period Do not climb on the outdoor unit or put objects on it e Do not put water container like vase on the indoor unit to avoid water dripping into the unit Dripping water will damage the insulator insid
45. PORT REMOTE CONTROL ASSEMBLY 81 MODEL RAK 50NH6A PART RAK 50NH6A PMRAS 07GH4 Q TY UNIT PARTS NAME CABINET PMRAS 25YH4 FAN MOTOR PMRAS 260GA PMRAS 25YH4 TANGENTIAL AIR FLOW FAN FAN SUPPORT ASSEMBLY PMRAS 25YH4 FAN COVER PMRAS 25YH4 PMRAS 19SH4 FAN MOTOR SUPPORT CYCLE ASSY PMRAK 25NH6 PIPE SUPPORT PMRAS 25YH4 SPRING PMRAS 25YH4 TERMINAL BOARD 2 PMRAS 260GHA R01 THERMISTOR ASSEMBLY PMRAK 50NH6A PMRAS 25YH4 R01 P W B MAIN amp RECEIVER DRAIN PAN ASSY PMRAS 25YH4 AUTO SWEEP MOTOR PMRAK 18NH6 PMRAK 18NH6 FRONT COVER ASSEMBLY FRONT PANEL PMRAK 18NH6 AIR FILTER R PMRAK 18NH6 PMRAS 25YH4 AIR FILTER L LOWER COVER PMRAS 25YH4 MOUNTING PLATE PMRAS 10C3M PMRAK 18NH6A REMOTE CONTROL SUPPORT REMOTE CONTROL ASSEMBLY 82 HITACHI RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A PM NO 0489E RA K 50N H6A Printed in Malaysia
46. R TO THE SPECIFICATION OUTDOOR TOTAL INPUT TOTAL AMPERES HEATING CAPACITY DIMENSIONS mm NET WEIGHT SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT ROOM AIR CONDITIONER INDOOR UNIT APRIL 2011 Refrigeration Air Conditioning Division 10 Any inflammable thing should never 11 SAFETY DURING REPAIR WORK In order to disassemble and repair the unit in guestion be sure to disconnect the power cord plug from the power outlet before starting the work If it is necessary to replace any parts they should be replaced with respective genuine parts for the unit and the replacement must be ef fected in correct manner according to the instructions in the Service Manual of the unit If the contacts of electrical parts are defective replace the electrical parts without trying to repair them After completion of repairs the initial state should be restored Lead wires should be connected and laid as in the initial state Modification of the unit by user himself should absolutely be prohibited Tools and measuring instruments for use in repairs or inspection should be accurately calibrated in advance 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 To check the insulation of the unit measure
47. S l 12V 7s LD203 Filter 1 S 4 9 o 9 12V i gt vid ov J a RX amp C531 Swi Room temp a Thrni ON T 1 2 11 CN M 16401 beg lt Temporary Sw PA 6P TOP 1 O OV D 12 H LINK o E R211 5 I CN2 V CZ 12P Side Board Im 1 zu ji RESISTOR Connecter Shape Circuit s Numerical Symbol Value T s C10 a Ja fa a ja ja a ja o gt 1a Ja a o a o ja o a 25V Dri i put No Numerical Ya lue Circuits Model riy 1 E Synbo pul i Nol zz DTC114EE TL org c Circvit s Wunerical E Symbol Value 7 a 0 14 m 25V DTAL14EE TL oio 25V ala f Shape 28C3441E 25V c c 2505383 c 25V 10V 25V 25V E DL L 188355 HN1D03FU 188355 28C5209H D Circuit s Model Jo Symbol S OfLD201 LR 52509 wg 25C5209H OlLD202 5LR 3320037 OlLD203 5L8 332M03T 2SA1162Y DTC114EE TL 078 Jumper s irevit s Use o phe Don t Use z 28C2462LC JW102 Use 1608 c JW601 Use 1608 C JWw801 01 1008 sp Use c p Use one ov c DTC114EE TIJ 078 c823 0 04
48. TER R PMRAK 18NH6 PMRAS 25YH4 AIR FILTER L LOWER COVER PMRAS 25YH4 MOUNTING PLATE PMRAS 10C3M PMRAK 18NH6A REMOTE CONTROL SUPPORT REMOTE CONTROL ASSEMBLY 78 MODEL RAK 18NH6A PART RAK 18NH6A PMRAS 07GH4 Q TY UNIT PARTS NAME CABINET PMRAS 25YH4 FAN MOTOR PMRAS 260GA PMRAS 25YH4 TANGENTIAL AIR FLOW FAN FAN SUPPORT ASSEMBLY PMRAS 25YH4 FAN COVER PMRAS 25YH4 PMRAS 07GH4 FAN MOTOR SUPPORT CYCLE ASSY PMRAK 25NH6 PIPE SUPPORT PMRAS 25YH4 SPRING PMRAS 25YH4 TERMINAL BOARD 2P PMRAS 260GHA THERMISTOR ASSEMBLY PMRAK 18NH6A PMRAS 25YH4 P W B MAIN amp RECEIVER DRAIN PAN ASSY PMRAS 25YH4 AUTO SWEEP MOTOR PMRAK 18NH6 PMRAK 18NH6 FRONT COVER ASSEMBLY FRONT PANEL PMRAK 18NH6 AIR FILTER R PMRAK 18NH6 PMRAS 25YH4 AIR FILTER L LOWER COVER PMRAS 25YH4 MOUNTING PLATE PMRAS 1003M PMRAK 18NH6A REMOTE CONTROL SUPPORT REMOTE CONTROL ASSEMBLY 79 MODEL RAK 25NH6A PART RAK 25NH6A Q TY UNIT PARTS NAME PMRAS 07GH4 901 CABINET PMRAS 25YH4 04 FAN MOTOR PMRAS 260GA R01 TANGENTIAL AIR FLOW FAN PMRAS 25YH4 908 FAN SUPPORT ASSEMBLY PMRAS 25YH4 909 FAN COVER PMRAS 25YH4 FAN MOTOR SUPPORT PMRAK 25NH5 CYCLE ASSY
49. Y PRECAUTION o Please read the Safety Precaution carefully before operating the unit to ensure correct usage of the unit o Pay special attention to signs of A Warning and A Caution The Warning section contains matters which if not observed strictly may cause death or serious injury The Caution section contains matters which may result in serious consequences if not observed properly Please observe all instructions strictly to ensure safety o The sign indicate the following meanings e Make sure to connect earth line S The sign in the figure indicates prohibition e Indicates the instructions that must be followed e Please keep this manual after reading PRECAUTIONS DURING INSTALLATION e Do not reconstruct the unit Water leakage fault short circuit or fire may occur if you reconstruct the unit by yourself e Please ask your sales agent or qualified technician for the installation of your unit A Water leakage short circuit or fire may occur if you install the unit by yourself WARNING Please use earth line Do not place the earth line near water or gas pipes lightning conductor or the earth line of telephone Improper installation of earth line may cause electric shock Be sure to use the specified piping set for R410A Otherwise this may result in broken copper pipes or faults e A circuit breaker should be installed depending on the mounting site of the unit A
50. ained below Using the test card Ultra redray test card Sensible area Check functions again If it does not work replace Within 2 cm the remote controller The sensible area should flash in orange when you operate the remote control unit if it is good 74 Procedure for Disassembly and Reassembly INDOOR UNIT RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A 1 Front Panel 1 Pull up the washable panel by holding it at both lower sides with both hands Fig 1 2 When the panel opens full push the inner part of the right arm into the inside and pull the panel forward while closing it gradually 2 Front cover 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 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 hook at the upper side of the indication lamp of the reception indication P W B and pull out the PW B forward Main P W B Support hook clef e Reception indication P W B Fig 4 75 4 Tangential air flow fan and fan motor 1 Remove two screws locking the drain pan 2 Press to lower the hook at th
51. ation the set temperature when stopped as well as the time continue to be counted Cooling Defrost 9 If the set lime is changed during sleep operation all data including set temperature time etc is cleared and restarted 10 If sleep operation is canceled by the cancel key or sleep key all data is cleared Indoor heat exchange temperature TEION Cooling defrost signal E Hi Med See basic operation Lo See basic operation Indoor fan j Outdoor fan ES Reversing valve heating on mode Balance period Reverse cycle period us Balance period 3min MAX 12min 3min 3000min1 fixed Lag Compressor speed 51 Dehumidifying Dehumidifying Sleep Operation 30sec Room temperature judgement Room temperature Set to 7 hours Sleep key O S E e 53 Operation lamp Cooling preset SLEEP on the remote k AME Timer lamp Room temperature judgemen Indoor fan Lo Silent Sleep Start Stop Switch Operation lamp Outdoor fan Thermostat judgement facing u Hi Vertical air Indoor fan Med in OFF 1 min ON deflector Horizontal Lo NH NH Shut Outdoor fan Med Lo Compressor speed Reversing valve Notes rotation speed
52. by the heat exchanger temperature the overload control is executed as in the following diagram Heat exchanger temperature KAFON KAFOF Med with overload Lo Basic operation of Performs only fan operation at the See page 51 See page 55 See page 57 temperature controller set speed regardless of the room temperature start stop switch e peration lamp When auto operation is started after 1 hour has elapsed since the operation was stopped When auto operation is started after the previous manual mode operation When the operating mode is switched to auto while operating at manual mode b Judging method Room temperature 23 C 3 C Cooling Room temperature lt 23 C 3 C Heating X 950 is the fine adjustment value from the remote controller Room temperature 220 9 C Judging operating mode change during operation Continuous judgment a Conditions for judgment any of the followings The mode is reviewed at every interval time When auto operation is started again before 1 hour has elapsed since the operation was stopped b Judging method Judge by setting the hysteresis on the final preset temperature The final preset temperature is the actually targeted preset temperature which is the sum of the basic preset temperature and each type of shift value e g 3 C by remote controller preset temperature correction value powerful shift value etc Currently cooling Room temperat
53. commended as the room temperature for dehumidifying 4 Press the D START STOP button Dehumidifying operation starts with a beep Press the button again to stop operation D m As the settings are stored in memory in the remote controller you only have to press the START STOP button next time HITACHI W Dehumidifying Function e When the room temperature is higher than the temperature setting The device will dehumidify the room reducing the room temperature to the preset level When the room temperature is lower than the temperature setting Dehumidifying will be performed at the temperature setting slightly lower than the current room temperature regardless of the 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 e The preset room temperature may not be reached depending on the number of people present in the room or other room conditions ald COOLING OPERATION Use the device for cooling when the outdoor temperature is 21 C 43 C If in doors humidity is very high 80 some dew may form on the air outlet grille of the indoor unit HITACHI Press the FUNCTION selector so that the display indicates COOL 2 HITACHI 3 START cooling function
54. e 1 START STOP button next time lt N You can raise or lower the temperature setting as necessary by maximum of 3 C HITACHI AN Press the temperature button and the temperature V 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 setting the indoor unit will produce a beep Ms A Press the FAN SPEED button AUTO LOW and SILENT is available E ee HEATING OPERATION e Use the device for heating when the outdoor temperature is under 21 C When it is too warm over 21 C the heating function may not work in order to protect the device e In order to keep reliability of the device please use this device above 15 C of the outdoor temperature HITACHI N Press the FUNCTION selector so that the display indicates 3 HEAT K Set the desired FAN SPEED with the FAN SPEED button the display indicates the setting AUTO The fan speed changes automatically according to the temperature of the air which blows out HI Economical as the room will become warm guickly But you may feel a chill at the beginning E MED Fan speed slow E LOW Fan speed slower A SILENT
55. e Label name Operation mode Shift value mode TEET Heating operation Fan speed AUTO Hi Med SHIFTW M Sleep FWSOY M Fan speed Lo Sleep SFTSZW_M Lo EWS M Cooling operation SHIFTC_M Heating Overload FWKAF_M Dehumidifying operation SHIFTD_M operation Med FWL_M Hi Set fan speed AUTO FWAH_M Hi Set fan speed Hi FWH_M Ultra Hi FWHH M Sleep FCSOY M Lo FCS M Cooling Med FCL M operation Hi Set fan speed AUTO FCAH M Hi Set fan speed Hi FCH M Ultra Hi FCHH M Dehumidifying Sleep FDOY M operation Lo 1 FDS1 M Lo 2 FDS2_M 47 Basic Cooling Operation Room temperature Temperature set for cooling and dehumiditying value set by remote control Fan speed set to auto Start Start stop switch Thermo judgment Thermo OFF Indoor fan Hi Med Lo Ultra Lo Engaged in the set fan speed in cases other than auto fan speed Operation lamp Rating v o a a c 2 I e S D a 9 a i o o 15sec gt Lo Outdoor fan Reversing valve heating on mode Notes 1 Condition for entering into Cool Dashed mode When fan set to Hi or Auto mode and temperature difference between indoor temperature and set temperature has a corresponding compressor rpm calculated value in Table 3 larger than WMAX
56. e center of the unit a little and pull the claw forward to remove the drain pan Fig 5 3 Remove the screws from the upper and lower bearing covers 4 Remove the locking hook of the lower bearing cover from the Cabinet Upper bearing cover Lower bearing cover 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 76 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A m Tf PART RAK 18NH6AS PMRAS 07GH4 MODEL RAK 18NH6AS Q TY UNIT PARTS NAME CABINET PMRAS 25YH4 FAN MOTOR PMRAS 260GA PMRAS 25YH4 TANGENTIAL AIR FLOW FAN FAN SUPPORT ASSEMBLY PMRAS 25YH4 FAN COVER PMRAS 25YH4 PMRAS 07GH4 FAN MOTOR SUPPORT CYCLE ASSY PMRAK 25NH6 PIPE SUPPORT PMRAS 25YH4 SPRING PMRAS 25YH4 TERMINAL BOARD 2 PMRAS 260GHA R01 THERMISTOR ASSEMBLY PMRAK 18NH6AS PMRAS 25YH4 R01 P W B MAIN amp RECEIVER DRAIN PAN ASSY PMRAS 25YH4 AUTO SWEEP MOTOR PMRAK 18NH6 PMRAK 18NH6 FRONT COVER ASSEMBLY FRONT PANEL PMRAK 18NH6 AIR FIL
57. e device will turn on at the designated times 1 94 Press the ON TIMER button the T ON mark blinks on the display N a NS D ON OFF Timer 1 Press the Cj 2 set the turn off time 3 Press the 2 ON ON OFF button so with the TIMER control TIMER button so that the Opa s that the 15 OFF mark button 15 OFF mark lights and blinks Press the J RESERVE the Tj ON mark blinks button NUS The device will turn on off and off on at the designated times The switching occurs first at the b x b gt Qu 17 77 pese time comes earlier N O n dd Om i 3d PM H e arrow mark appearing on the d l M y display indicates the sequence of a v ri an AX switching operations 7 N Bud O LI LI How to Cancel Reservation button Point the signal window of the remote controller toward the indoor unit and press the CANCEL The 6 RESERVED sign goes out with a beep and the TIMER lamp turns off on the indoor unit NOTE You can set only one of the OFF timer ON timer and ON OFF timer 99 3 Set the current time with the 4 Press the O TIME button again TIMER control button 2 Press the TIME button Example The current time is 1 30 p m The time indication starts lighting instead of flashing ST A P P N ay ri Nm The time indication will disappear gt b O
58. e the unit and causes short circuit e When operating the unit with the door and windows opened the room humidity is always above 80 and with the air deflector facing down or moving automatically for a long period of time water 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 e 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 eguipments 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 adeguately supervised by a responsible person to ensure that they can use the appliance safely e Young children should be supervised to ensure that they do not play with the appliance a5 NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT REMOTE CONTROLLER from the remote controller capability o This controls the operation of the indoor unit The range of control is about 7 meters If indoor lighting is controlled electronically the range of control may be shorter This unit can be fixed on a wall using the fixture provided Before fixing it make sure the indoor unit can be controlled o Handle the remote controller with care Dropping it or getting it wet may compromise its signal transmission o After new batteries
59. e the cooling de C capability of the air conditioner for example more 92 4 people entering the room using heating eguipments and etc the preset room temperature cannot be achieved Not Operating For A Long Time 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 When Lightning Occurs A Warning To protect the whole unit during lightning please stop operating the unit and remove the plug from the socket Ne Interference From Electrical Products lt gt lt gt A Caution Inverter type fluorescent lamp To avoid noise interference please place the indoor unit and its remote controller at least 1m away from electrical products To prevent interference place at least 1m away 27 ATTACHING THE AIR CLEANSING FILTERS A CAUTION Cleaning and maintenance must be carried out only by gualified service personal Before cleaning stop operation and switch off the power supply 1 Open the front panel AN o Pull up the front panel by holding it at both sides with both hands 2 Remove the filter e Push upward to release the claws and pull out the filter
60. ed 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 1MQ 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 place a part on a metal plate with grounding 5 Be careful not to fail to turn off power when you repair the printed circuit board At the same time try to repair the printed circuit board on a grounded metal plate Body earth Elimik conductive band Z Clip for connection with a 1MO grounding wire Fig 2 Body Earth 6 Use a three wire type soldering iron including a grounding wire Metal plate of aluminium stainless steel etc Working table Resistor of 1 MQ 1 2W Earth wire Bare copper wire for body earth Fig 3 Grounding of the working table Soldering iron Grounding wire Screw stop at the screwed part using a rag plate Fig 4 Grounding a soldering iron Use a high insulation mode 100V 10MQ 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 A CAUTION In guiet operation or stopping the running slight flowing noise of refrigerant in the refrigerating cycle
61. en the power is resumed switch off the power supply When you switch on the circuit breaker the operation will be automatically restarted with previous operation mode and airflow direction Note 1 If you do not require Auto Restart Control please consult your sales agent or OFF by remote control 2 Auto Restart Control is not available when Timer or Sleep Timer mode is set AUTOMATIC OPERATION The device will automatically determine the mode of operation HEAT COOL or DEHUMIDIFY depending on the current room temperature The selected mode of operation will change when the room temperature varies However the mode of operation will not change when indoor unit connected to multi type outdoor unit HITACHI N Press the FUNCTION selector so that the display indicates the A AUTO mode of operation When AUTO has been selected the device will automatically determine 7 the mode of operation HEAT COOL or DEHUMIDIFY depending on the current room temperature However the mode of operation will not change when indoor unit connected to multi type outdoor unit If the mode automatically selected by the unit is not satisfactory manually change the mode setting heat dehumidify cool or fan Press the 1 START STOP button START Operation starts with a beep STOP Press the button again to stop operation P m As the settings are stored in memory in the remote controller you only have to press th
62. eration thermo off temperature is set temperature with shift value 3 C After thermo off operation continue in Fuzzy control mode Compressor minimum ON time and OFF time is 3 minutes During normal cooling mode compressor maximum rpm CMAX will maintain for 60 minutes if indoor temperature is lower than CLMXTP No time constrain if indoor temperature is higher than CLMXTP When fan is set to Hi compressor rpm will be limited to CKYMAX When fan is set to Med compressor rpm will be limited to CJKMAX When fan is set to Lo compressor rpm will be limited to CBEMAX During Cool Dashed when room temperature reaches set temperature 1 C compressor rpm is actual rpm x DWNRATEC 55 Reversing Valve Defrosting 15 min or more Auto fresh defrosting p lt lt Over defrosting inhibit period 30sec gt gt Fan speed Start Stop Switch set to Hi Defrost signal Preheating judgment Preheating Hi Med Lo Ultra Lo Stop Indoor fan Outdoor fan Operation lamp 11 1 11111 AN 30sec Reversing vave P heating on mode Reverse cycle peri verse cycle period Deceleration N N 20 min Max 3min Max 3min 20 min Max re gt lt ian ial TDF421 1 min le 1min gt WMAX STARCPL o a 9 o o o g a E o o Notes
63. eration once power is switched on CIRCUIT BREAKER When you do not use the room air conditioner set the circuit breaker to OFF 25 THE IDEAL WAYS OF OPERATION Suitable Room Temperature A Warning Freezing temperature is bad for health and a waste of electric power W Ee Ventilation A Caution Do not close the room for a long period of time Occasionally open the door and windows to allow the entrance of fresh air 4 tm Nc Do Not Forget To Clean The Air Filter 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 Install curtain or blinds It is possible to reduce heat entering the room through windows A Effective Usage Of Timer At night please use the OFF or ON timer operation mode together with your wake up time in the morning This will enable you to enjoy a comfortable room temperature Please use the timer effectively Please Adjust Suitable Temperature For Baby And Children Please pay attention to the room temperature and air flow direction when operating the unit for baby children and old folks who have difficulty in movement 26 FOR USER S INFORMATION The Air Conditioner And The Heat Source In The Room A Caution PE 25 If the amount of heat in the room is abov
64. f you set 3 hours sleep 1 time at 11 38 p m the turn off l 4 P time is 2 38 a m timer 1 Set the ON timer m z The device will be turned off by the sleep timer and turned on by on timer 2 Press the SLEEP button and set the sleep timer x C q ZH For heating 30 J 6 In this case the device will turn off L H yon in 2 hours at 1 38 a m and it will ty 1010 be turned on 6 00 next morning N How to Cancel Reservation button Point the signal window of the remote controller toward the indoor unit and press the CANCEL The RESERVED sign goes out with a beep and the TIMER lamp turns off on the indoor unit 24 HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER Remove the cover as shown in the figure and take out the Push and pull to the old batteries direction of arrow Install the new batteries N The direction of the batteries should match the marks in the case J A CAUTION 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 TEMPORARY SWITCH If the remote controller does not work due to battery failure press this switch to start and stop operation o This temporary operation will be at the setting made most recently The unit will immediately go into automatic op
65. flector M lt Indoor Outdoor interface circuit circuit E DC fan motor drive Microcomputer clock circuit g Indoor DC fan motor 43 BASIC MODE Operation mode Fan Cooling Dehumidifying dehumiditying operation by the function select button only not including that engaged by the dehumidify Heating button Auto Basic operation of start stop switch Start Stop Start Stop Start stop switch Operation tamp Start stop switch m n E Timer functions Off timer Operation tamp Cancel switch Operation temp Timer tamp Timer memory Off timer during stop Change in reserved time On timer Srart stop switch Reserve switch ancel switch Operation temp Timer tam Timer memor Change in reserved time On timer during operation Off gt On On gt Off timer Start stop switch Reserve switch Cancel switch Operation lamp Timer lamp Timer memory mum eum OFF ON OFF Oh ON Off gt On timer On Off timer On gt Off timer Off gt On timer during operation i during stop Auto Changes from Hi to Med or Lo depending on room temperature Changes between Lo and Med depending on the room temperat
66. h operation mode AUTO SWING button Controls the angle of the horizontal air deflector TIMER control Use this button to set the timer OFF TIMER button Select the turn OFF time ON TIMER button Select the turn ON time RESERVE button Time setting reservation CANCEL button Cancel time reservation COOL FAN FAN SPEED SLEEPING STOP CANCEL START RESERVE START STOP TIME TIMER SET TIMER SELECTOR ON TIMER OFF TIMER XlaselGlolol ol Precautions for Use Do not put the remote controller in the following places Under direct sunlight o In the vicinity of a heater Handle the remote controller carefully Do not drop it on the floor and protect it from water Once the outdoor unit stops it will not restart for about 3 minutes unless you turn the power switch off and on or unplug the power cord and plug it in again This is to protect the device and does not indicate a failure o f you press the FUNCTION selector button during operation the device may stop for about 3 minutes for protection AUTO SWING 216 VARIOUS FUNCTIONS W Auto Restart Control o If there is a power failure operation will be automatically restarted when the power is resumed with previous operation mode and airflow direction As the operation is not stopped by remote controller o f you intend not to continue the operation wh
67. i5 Facing down Maximum speed Compressor speed Compressor speed ge Notes Notes 1 The sleep operation starts when the sleep key is pressed 1 New cool rhythm is engaged when the fan speed is auto and the room temperature is less than 2 When the sleep key is set the maximum compressor speed is limited and the indoor fan is set to sleep Lo set one plus 0 66 C in the auto operation mode or cooling mode 3 30 minutes after the sleep key is set the sleep shift of temperature starts and upper shift is made at least 6 times If 25 C 2 The minimum new cool rhythm time is 10 minutes when the temperature falls and rises is not reached after 6 shifts shifts repeat unit 25 C is reached 3 Cool rhythm is not engaged during Nice temperature Sleep operation 4 The sleep shift upper value of set temperature is 28 C 4 PI control is engaged during new cool rhythm the speed limit is the same as during normal operation 5 After 6 hours a shift down to the initial set temperature is made at a rate of 0 33 C 5 min l 5 The new cool rhythm set temperature is also shifted during thermo OFF 6 If the operation mode is changed during sleep operation the set temperature is cleared and shift starts from the point when switching is made 7 The indoor fan speed does not change even when the fan speed mode is changed 8 When operation is stopped during sleep oper
68. is heard occasionally but this noise is not abnormal for the operation When it thunders near by it is recommend to stop the operation and to disconnect the power cord plug from the power outlet for safety The room air conditioner does not start automatically after recovery of the electric power failure for preventing fuse blowing Re press START STOP button after 3 minutes from when unit stopped If the room air conditioner is stopped by adjusting thermostat or missoperation and re start in a moment there is occasion 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 This room air conditioner should not be used at the cooling operation when the outside temperature is below 10 C 14 F This room air conditioner the reverse cycle should not be used when the outside temperature is below 15 C 5 F If the reverse cycle is used under this condition the outside heat exchanger is frosted and efficiency falls When the outside heat exchanger is frosted the frost is melted by operating the hot gas system it is not trouble that at this time fan stops and the vapour may rise from the outside heat exchanger SPECIFICATIONS MODEL RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A FAN MOTOR 3
69. lude the shift values in Table 2 other indoor units which is switched on later does not operate while Heating Dehumidifying selected for the first indoor unit the next indoor unit will also start to cool or dehu the lamp lights Circulating fan 2 midify 45 MODEL RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A PROM LABEL NAME REOUIRED VALUE REQUIRED VALUE REQUIRED VALUE REQUIRED VALUE REQUIRED VALUE NO OF UNIT SIDE OF UNIT SIDE OF UNIT SIDE OF UNIT SIDE OF UNIT SIDE 0A2 RTOTSA 0 C 0 C 157 WMAX_M 3500 min 5300 min 5300 min 5000 min 5000 min 158 WMAX2 M 3500 min 5300 min 5300 min 5000 min 5000 min 159 WSTD M 2950 min 4000 min 4000 min 4000 min 4000 min 15A CMAX M 3000 min 3300 min 3300 min 4300 min 4300 min 15B CSTD M 2400 min 3250 min 3250 min 3150 min 3150 min 15C SDMAX M 2400 min 2400 min 2400 min 1550 min 1550 min 15D SDRPM M 2100 min 2100 min 2100 min 1400 min 1400 min 15F WMIN M 800 min 800 min 800 min 800 min 800 min 160 CMINHI M 800 min 800 min 800 min 800 min 800 min 161 CMIN M 1200 min 1200 min 1200 min 1200 min 1200 min 162 DMIN M 1200 min 1200 min 1200 min 1200 min 1200 min 163 PKOU M
70. me has been reached Does Nice temperature reservation It does not work It works only during cooling function operate during dehumidifying and heating This is because Nice temperature reservation function is operating The start time varies according to the load of room Since load varies greatly during heating the operation start time is corrected so it will vary each day Even if the same time is preset the operation start time varies Has the clock been set Timer cannot be set unless the clock has been set The current time display The current time disappears When the current time is disappears soon in approx 10 seconds The set the display flashes for time set display has priority approx 3 minutes The timer has been programmed Is the current time past the preset time but the preset time disappears When the preset time reaches the current time it disappears 68 The indoor fan varies among high air flow low air flow and breeze in the auto fan speed mode Heating operation Loud noise from the outdoor unit is heard when operation is started Noise from the outdoor unit occasionally changes There is a difference between the set temperature and room temperature Air does not flow immediately after operation is started 69 This is because the cool wind prevention function is operating and does not indicate a fault The heat exchanger te
71. mperature is sensed in the auto speed mode When the temperature is low the fan speed varies among high air flow low air flow and breeze When operation is started the compressor rotation speed goes to maximum to increase the heating or cooling capability so noise becomes slightly louder This does not indicate a fault The compressor rotation speed changes according to the difference between the thermostat set temperature and room temperature This does not indicate a fault There may be a difference between the set temperature and room temperature because of construction of room air current etc Set the temperature at a comfortable for the space Preliminary operation is performed for one minute when the power switch on and heating or dehumidifying is set The operation lamp blinks during this time for heating This does not indicate a fault xd TROUBLESHOOTING WHEN TIMER LAMP BLINKS Model RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink SELF DIAGNOSIS LIGHTING MODE Model RAK 18NH6AS RAK 18NH6A RAK 25NH6A RAK 35NH6A RAK 50NH6A No Blinking of Timer lamp Reason for indication Possible cause Reversing valve defect 1 Reversing valve defect When the indoor heat exchanger 2 Heat exchanger thermistor maat temperature is too low in the disconnected
72. ower Dor Dog 1 aw SILENT Fan speed ultra slower START Press the D START STOP button Fan operation starts with STOP 8 beep Press the button again to stop operation A I Td NOTIONE When the AUTO fan speed mode is set in the cooling heating operation 4 N e When the difference of room temperature and setting temperature is large fan starts to run at HI speed For the heating operation 9 After room temperature reaches the preset temperature the heating operation which changes the fan speed and room temperature to obtain optimum conditions for natural healthful heating will be performed When the difference of room temperature and setting temperature is large fan starts to run at HI speed For the cooling operation e 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 lt p HOW TO SET THE TIMER on 1 Set the 4 TIME button L RESERVE E 0 You can set the device to turn off at the preset time CANCEL T After you change the batteries TIME b 00 OFF TIMER UU VA N ON TIMER 5 T iss the G5 OFF TIMER button The 15 on the display O NZ O 0 9 90 ZIN OFF mark blinks i No e Th
73. peration is started Med 2 Runs at Lo when thermo is n off o S Hi Operates at Hi regardless of the Set to ultra Hi when the Set to Hi in modes other than when the Set to ultra Lo Lo Med Hi ultra Hi or stop depending on the room temperature and o room temperature compressor runs at maximum compressor stops time Set to stop if the room temperature is 18 C in the ultra Lo mode other than during E speed and to Hi in other modes preheating cooling is recovered at 18 33 C E Set to ultra Hi when the compressor is running at maximum speed during hot dash or when recovered from defrosting Qa n c i Med Operates at Med regardless of Same as at left Set to Med in modes other than when the Set to ultra Lo Lo Med or stop depending on the room temperature and time Set to the room temperature compressor stops stop if the room temperature is 18 C in the ultra Lo mode other than during preseating cooling is recovered at 18 33 C Lo Operates at Lo regardless of the Same as at left Set to Lo in modes other than when the Set to ultra Lo Lo or stop depending on the room temperature and time Set to stop if room temperature compressor stops the room temperature is 18 C in the ultra Lo mode other than during preseating cooling is recovered at 18 33 C The fan speed is controlled
74. rder to prevent any other refrigerant from being charged each port diameter has been changed Charge hose In order to increase pressure resistance hose materials and port size have been changed to 1 2 UNF 20 threads per inch When purchasing a charge hose be sure to confirm the port size Electronic balance for refrigerant charging As pressure is high and gasification speed is fast it is difficult to read the indicated value by means of charging cylinder as air bubbles occur Torgue wrench x nominal diam 1 2 5 8 The opposite side dimensions of flare nuts increase Incidentally a common wrench is used for nominal diameters 1 4 and 3 8 Flare tool clutch type O By increasing the clamp bar s receiving hole strengh of spring in the tool has been improved Gauge for projection adjustment Used when performing flare processing by means of conventional flare tool Vacuum pump adapter Connected to conventional vacuum pump Gas leakage detector Exclusive for HFC refrigerant e Incidentally the refrigerant cylinder comes with the refrigerant designation R410A and protector coating in the U S s ARI specified rose color ARI color code PMS 507 e Also the charge port and packing for refrigerant cylinder require 1 2 UNF 20 threads per inch corresponding to the charge hose s port size 4 Servicing work Rerfigerant recharging Q Compound Pressure pressu
75. re gauge gauge Gauge manifold 0 1MPa 6 Oh Handle Lo O O Handle Hi O Charge hose G 9 lt lt Charge hose Vacuum pump lt Ball valve adapter Vacuum pump Refrigerant cylinder O lt Scale Pd Q Charge hose Q Service valve 2 Way A C Kl o A Ball valve i O Servi O Service port Nay A CAUTION 1 Be sure to use the vacuum pump vacuum pump adapter and gauge manifold to refer to their instruction manuals beforehand 2 Ascertain that the vacuum pump is filled with oil to the level designated on the oil gauge 3 After closed the ball valve of charge hose it should be disconnected at service port side and refrigerant cylinder side at first Next after discharging the remained gas in the charge hose by opening the ball valve a little disconnect it at gauge manifold side You can prevent from being released the refrigerant suddenly by connecting the ball valve to service port And you can work with more safety Working steps 1 Connect the charge hose to outdoor unit 2 Connect the vacuum pump adapter to the vacuum pump Connect the 1 2 conversion adapter to the vacuum pump adapter Connect the charge hose to the conversion adapter Then service valve amp Ois closed 3 Connect the charge hose G to the refrigerant cylinder 4 Open the handle Lo 6 Turn ON the power
76. switch of the vacuum pump amp adapter f Run the vacuum pump in specified time 5 When the compound pressure gauge s pointer has indicated 0 1MPa place the handle Lo in the fully closed position Turn OFF the power switch of the vacuum pump amp adapter 6 Remove the charge hose Oof vacuum pump at portion a 7 Air purge of gauge manifold Open the refrigerant cylinder s valve and push the valve core at portion 8 of gauge manifold Then the refrigerant is discharge in a moment 8 Calculation of charged refrigerant amount 9 Charging of refrigeration e Open the handle Lo in a turn and charge the designated amount 10 Completion of charging 11 Be closed the valve of charge hose O 12 Run the compressor at cooling operation 13 Remove the charge hose amp eRemove the charge hose rom portion eRemove the charge hose from portion 6 14 Attach the caps 15 Gas leakage check SWITCH SETTING TO SELECT 1 8 kW OR 1 2 kW CAPACITY 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 ROM SELECT
77. t receiver unit receives the infrared signal from the wireless remote control The receiver amplifies and shapes the signal and outputs it 3 Buzzer Circuit 12V A R721 82 Bz1 Microcomputer CP Buzzer output 30 1 0 Fig 3 1 Buzzer Circuit e 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 Metal diaphragm P aic element buzzers sound ZZ LO N LU N i t 4 N V gt 4 V Sound wave D Wa H Sas j SWW Fig 3 2 Buzzer Operation 63 4 Auto Sweep Motor Circuit 12V Auto sweep motor for horizontal air defectors NT 9 KRK Oe Ce I Microcomputer v Y Fig 4 1 e Fig 4 1 shows the Auto sweep motor drive circuit the signals shown in Fig 4 2 are output from pins 15 of microcomputer Horizontal air Microcomputer pins Step width deflectors 10ms Horizontal air deflectors 1 2 3 4 5 6 6 a a Fig 4 2 Microcomputer Output Signals e Asthe microcomputer s outputs change as shown in Fig 4 2 the core of the auto sweep motor is excited to turn the rotor Table 4 1 shows the rotation
78. the insulation resistance between the power cord plug and grounding terminal of the unit The insulation resistance should be 1MQ or more as measured by a 500V DC megger The initial location of installation such as window floor or the other should be checked for being and safe enough to support the repaired unit again If it is found not so strong and safe the unit should be installed at the initial location reinforced or at a new location be placed about the location of ae 2 E installation Check the grounding to see whether it is proper or not and if it is found improper connect the grounding terminal to the earth WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS 1 Scope The standards provide for items to be generally observed in carrying and handling semiconductors in rela tive manufacturers during maintenance and handling thereof They apply the same to handling of abnormal goods such as rejected goods being returned Object parts 1 Micro computer 2 Integrated circuits IC 3 Field effect transistors FET 4 P C boards or the like on which the parts mentioned in 1 and 2 of this paragraph are eguipped Items to be observed in handling 1 Use a conductive container for carrying and storing of parts Even rejected goods should be handled in the same way A conductive polyvinyl bag IC Conductive sponge Fig 1 Conductive Container 2 When any part is handl
79. tor E i Tz El E yp p BRN An a Fionan Film Capacitor a GNG S Do a y vs m ha 2 tr Cae Ceramic Capacitor RED e S TN S WS a 5 o I D X Electrolytic Capacitor Terminal Board b 116 a a e E 12V 2 Symbol of the parts list is Nd 4 4 4 SH as follow PH 5P Top CN 3 5V XA 3P To o 4 a Symbol Shape i e 2 A Axial z aon ee E M R Radial o TA 1811 RBbT 4 H Manual R821 F C821 R8 due E Te i ay Stepping Motor C Chip we for auto sweep 1 S az ce x BZ1 5V N Buzzer N Tele 2 W R522 zi iola ee dee bes M on sn se 33 30 e b 8801 2 ja ja 92 72 ja je 15 N Pe 2 A 5V vv V VYY Yv RA CNI B4 Es br Er Bo be sa fel bs bal ps silo je OV R644 12V pt A amp EREREREREREERERE si SES MISI EIE R655 9 e PA 4P TOP o EE BE EIE B ER EE ES geafel b asjas 3 BB SE E gt os gt gt o 5 Heat exchanger SIEIRIE 8 5 j 3502 OU wae wae d 2 S Wired Remocon Thermistor 2 149 mn 8 2 3 le lz Z 5 EE ES E n mevr MY AUTO 4 TUN 5 CL mele le ES ESE eE ES vaan rd Ti 1 S GRENEN E Els 1 R306 3 vec SEIS BIE E j oursinE xp mite Zar z Y 2 12V EI ID lt lk C i m sara hal i bei x One SIS es dni om C505 ES na matte 2505 M 2 SEND PH 5P Top BLK TT SN e o o o O 6 vet CURRENT SELECT 3e m s n n mmm t R504 A
80. ure Set to ultra Lo Lo Med Hi ultra Hi or stop depending on the room temperature time and heat exchange temperature Set to stop if the room temperature is 18 C in the Operating mode is judged by room temperature and outdoor temperature 1 Judging by outdoor temperature Temperature set for cooling Thermo iudgment Compressor Med ir Operating mode is judged by outdoor temperature Only when the mode is not restricted by this judgment the judgment by room temperature in the next paragraph will be performed a Outdoor temperature 2 30 C Restricted to cooling b Outdoor temperature 9 C Restricted to heating 2 Judging by room temperature Operating mode at start up is judged initial judgment a Conditions for judgment any of the followings Temperature division Fan speed ultra Lo mode other than during preheating cooling is recovered at 18 33 C Division 1 Lo When the compressor is running at maximum speed In modes other than Division 2 Lo during hot dash or when recovered from defrosting left Division 3 Med eee Division 4 Med a 29 66 Lo Compressor stopped 1 The indoor fan also stops when the Heat exchanger fore for3 minutes is i Hi or ultra HI temperature y compressor is in stop status mia to auto 1 Runs at Hi until first thermo off after o
81. ure Final preset temperature 3 C Change to heating Room temperature gt Final preset temperature 3 C Continue cooling Currently heating Room temperature Final preset temperature 2 C Change to cooling Room temperature lt Final preset temperature 2 C Continue heating 30 C Outdoor temperature 3 C Cooling Heating final preset temperature 2 C Sleep operation Enters sleep operation after set Same as at left Same as at left Same as at left Same as at left with sleep button ON ason the left See page 53 See page 55 See page 59 Performs the sleep operation of each operation mode Action during sleep operation Lo sleep operation Combination of operations Notes When operation mode is selected S During automatic operation 1 Refer to the PWRITE ZU data for the constants expressed by capital alphabet letters in m One unit Other unit the drawing e You cannot operate the indoor units in the following combinations Cool e When heating operation is automatically selected for the first indoor unit the next 2 The speed set of rotation for the fan motor in each operation mode are as shown in Table 1 The indoor unit which is switched on first continues to operate but ooling indoor unit will then start to heat Also if cooling or dehumidifying is automatically 3 The set room temperatures in the diagram inc

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