Home

SERVICE MANUAL

Contents

1. CN8 12V CN10 S XA 6P Top Temperature fuse of terminal board 3 9 Meo 6 102 Built in terminal board L101 2 15 Indoor To Fan M
2. MODEL RAC 18YH6 RAC 25YH6 COMPRESOR MORTOR Mounting form PCB SET MAIN P W B A Axialinsertion M MAIN P W B R Radialinsertion H HIC 80ARD 15A FUSE L101 RL1 H Handinsertion G Ch face mounting 5 S ln addit ken surface mounting EN RESISTER RESISTER CAPACITOR _ CAPACITOR _ TRANSISTORS cnt SYMBOL 2 2 SYMBOL wislelz s SYMBOL SYMBOL SYMBOL MODEL 2 5 PK6P WHT seo HEB S sao AE un 5 lt 5 XI EEG F monn E Eu nac n p R02 PIT 3k 596 1 4 A M 38 ene IMs 14 22 KRE soo ami mos Rave 100 cos 1800 50 es ces zz O Roa oss w zs r NENNEN n n m
3. JOMOg epnjoui sesneo 15504 q Md eui eoejdeu BU Addy S A l doid pejyoeuuoo pue 40 9 9J L q V1 S08V L S A uo g pue y s eululJ9 1e jndino Buieq 0 29 SI ON eDe1oA K ddns 18 wod eAnoejeqg SOU OL SHUIIQ LOE 78 pepeeu Md y eoe doJ pue NOD 499u2 UexyoJq eq S IOO 4 SJIOO JN q Md au eoejdeu A ddns amod MS 2 90 eui eoejdau piedoud 1 5 ON SOK GEY JO Spue yoq Bulag AGEDA SI ON SOK ABE ACEO EWON G pU indino Bulaq AGEDA SI SO pis yun 100pul uo 1ndino Bu q AGE SI i Api edoud pejoeuuoo e qeo Burjeuuoo 94 S S A UOIEOIUNWWWOD Seul 6 SHUIIG 10607 _ 79 suJeJDeip 94 peaj pue jo 5 JojsiulJeu y Ul sued eoe deu BU eoe deu JOJSIWUIBU 991 JOBUUOD lt 99A 10 99UU0D JO SILJAU eui S ewou
4. Main P W B HIC 9 6 RAD 4 5 SHT 4 E 2 o H3 Eleciric 2 E dc Microcomputer expansion O ul BN 26 Edi SE CNI5 A cao DOB IC6 ANS 62 wei XA 6P 6 6 9 R 56 Valve 2 222 T R295 CE B OV R296 e Electric expansion valve is driven by B 12V Opening of the valve is controlled by feeding power to 1 or 2 phases of the 4 phase coil to switch the polarity of the coil e The relation between the conducting phase switching direction and open close direction is as shown below When the power is turned on approx 0 9 V is applied to CN15 pins 1 to 4 when no power is supplied approx 12 V is applied When the power is reset expansion valve performs initial operation for 5 to 10 seconds During initial operation measure pins 1 to 4 of CN15 using multimeter If no change is found around 0 9 V or 12V expansion valve or microcomputer is defective Fig 6 15 shows logic waveform during the operation of expansion valve Table 6 4 2 5 5 8 we ON ON OFF OFF ON 6 vern OFF ON ON orr OFF 6 owed OFF oFF ON ON ON OFF OFF sw OFF OFF OFF ON ON ON Operation mode 15253456578 VALVE CLOSE 857565554321 VALVE OPEN Connector Pin No
5. soyesodend y pue eu og SyOIIS uO OS pue 2 synispoo exouis aui eg 550 941 sdols uonejedo u u pue p oo2 SI ue y esiou Buiqqnu ys 2 e oKo y Ul esiou 14616 4 uomneJedo y JO 1nq nooo jeuoispe55o pu uuou ud eui 6uluuns eui Buiddois 10 jeinb S ON JOYCOIG BU 40 Joj q 5 5 au xoeuo eui Ag p yyu p eq ues y enjeu eui sy syuliq ejdsip eui uo YAWIL pedduis 10 u10 s S4 JO 40y oArsseoxe 5196 p109 Jou9Qjui jun y Aj ejuepiooe JO 4 e qeis 100 SI uoiws 94 be Allu nb u SMOG 9SnJ y JO JJO S YJIMS 94 4n220 pjnous J 12210 Ajereipeuuuui jueDe 12e1uoo pue no 40
6. yOOUS eoujoeje ue esneo os JON BuiuojeJis ejqeo jueA aJd seouewo e eui s ejqeo siu 1990s y eoueijdde eui spee jou op 10 ejqeo uoisuajxe ue eq eo y 12euuoo JOU uyeeu JNOA 10 Jo ue V yun y pue eAouilaJ Ji JO YOOUS 21299 un BU pue sanowa peeu ji INOA J9e U0D pue YOOUS 21 esneo jjes JedoJduu eoueuejureui JO INOA 19e1uoo esee g Uonenjs jeuuouqe aso y JO 11045 nej INOA 19891UO2 BU UN JO y pue y dois eseejd jjeurs yi esue uonentiis pinoys AONVNALNIVIN YO SNILdIHS SNIGNG SNOILNVOSAYd pee S sjueuoduJoo eoujoeje esneo seoJnos jeujo JO BSN yL pesn si 05 A08Z2 eseud 5 e
7. 5901931534 ONILSALAY 195 JO BY JO peeisur d js eui 195 ueeq seu Jo uo JO BU UBYM d js eui 1es J iun JOOPU 9y uo yo suun H3NWI 1 C eui pue d q e 5906 3534 uollnq JAONVYD eui ssaJd pue BU JO eUBIS y JUIOY 01 MOH 1xeu 00 9 1e peuoeai 1souJ e eJnje1eduie 1eseJd y yeu os uo pue ure 92 12 sinou 2 ul Jo y eseo SIU U zi C l 104 El w gt d ls au Jes pue uollnq 43375 sseJd J q uo pue 19 1 dee s eui peuun aq 94 deals gez Sr euim OU urd 82 11 H 7 p deejs sino es gt 1 YE 9 3 C3 I Jo uJn y ejdsip eui 195 ueeq sey dee s eui u yM JOOPU eui deeq 5146 H3IALL 941 eui uo uoneuuojJur 94 43375 eui sseud pue yun JOOPU BU
8. esnj WG 941 JI eui eJojeq eu Buljgesip payenyoe yo uin auns eg 1991109 PUB O Seulu SI UonoejoJd 1ueunoJeno s ddns jewod MS 941 JO y A iedoud 199141025 g pu je A0EZ 02ZOV S uonesedo euuouqe JO uonejedo ON 13 LINN AOOGLNO ONDIO3HO 76 y JOJOW ugy y pue AS ueemjeq payoums Ajeyeusayye SI 1ndino y ul 19 s 1 e Duisn AG OFAG Z SI y ees o YOOYD ewou I 2 pue y ueewjeq eui S pue JOJOW UP y 5 Aue J0129Uu09 y 199uuoo AZ Oq xoidde e oge SI eui lewiou 1 9 pue ueewjeq eui S seinuiuJ 2 JO ue y Jeye sJno90 JOE Uy Bunei do ue eui S SOA ou UO peueeJos xIs AQ G pue AG ueemjeq pue y uo 9 pue 8LNO ueemjeq uloq x29u2 paeau AGL SI 2019 pue vL eu e eH amp pe xyoo 1Je jedoud y S JOJO YOO UPS cL SHUG f f
9. u 195 WOO 5 u uAA ay ay uo PUNO SI 10 1snp j jnsoJ ABW 10 YOOYS ue JOU 10 5 UY SNOILONN4 19490S y jou si au 94908 u Ajaindes si y J ees 42945 ui do d sun ay speeoxe WOOL e ui 1lu s id y Anfu 10 asdejjoo pinoa senipiqede 5 Bu Jipiuinu q pue 5 e qeisun ONINHVM 10 seu u JI 10 9AISSOO v y jo peeue eAno9jje pepueujuJoo8i SI peuoeai eq jou 1esaJd eui pesn JO WOO eui 899 9J0J8q exe ACW y yey OS WOO ue s 941 sun siy oj NOLLIGIHOHd JOOPU 84 0 aq pjnous uo opjsnesun 5 si F mo Aluixoid in UD Jod Buneeu sun y j BuiseeJoep sun
10. JO 11045 eDexeo y JONIJSUODI JOU oq NOILVTIVLSNI 9 SNOILNVOAdd Buipeei saye siy day esee d eq snu ey SUOONASU sejeoipu sufis jo eu sBuiue ui eui ejeoipui sufis eu SNINYVM V uolliqiuoid sejeoipur y siu Q Ajejes eJnsue 215 suononuisur eAJesqo esee d A iedoud jou seouenbesuoo snoies ur YOIUM surejuoo uonoes uonne Anfu snoues yyeap esneo Aew 2135 peAJesqo jou JI U9IUA Ssuiejuoo uornoes 94 uonneo Ww pue V JO SUBIS eroeds Aed y 1084109 UN eui 810jeq Ajjnjoseo LS eui peas esee d NOILNVOsAdd ALAAVS ASN OL 88c OSZ QHASE OVY 8vG 809 012 082 O 9HASESVH 9HASZ SYY 9HA8L SVH HLd3G LHOI3H HLGIM 33ON pue uod
11. M F gre in tn Engaged in the set fan speed in cases other than auto fan speed Operation lamp G _____ Am I 1 min Max Z a Rating 3000 LL 2min 30sec 7 2min 30sec Temperature set for cooling and dehumiditying value set by remote control 4 2600 min 3000 Compressor rotation speed Outdoor fan Reversing valve cooling 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 2 larger than CMAX 2 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 3 During Cool Dashed operation thermo off temperature is set temperature with shift value 3 C After thermo off operation continue in Fuzzy control mode 4 Compressor minimum ON time and OFF time is 3 minutes 5 During normal cooling mode compressor maximum rpm CMAX will maintain for 60 minutes if indoor temperature is lower than CLMXTP No time const
12. eui 5 eAoqe eut Burwood Aj euuou oi sire 15 JO y ui ejdoed eui UO Buipuedep Dunes 5 y nuBi s eijnjejeduia wool enjoy ay uoeai jou 5900 o senunuoo eui oi peuoiiMs s JO ueui pue p ddols si uoneJedo sejejedo JOSUas 1eeuaid 10 eui sy i dwel NOLIVu3dO 941 SI uonejedo Bunsouj p 10 Aesseoeu BunsoJjep woad y pue Joopino 1504 S499uo y 5 si Bune u y se si y olul pue eui UI 95910 219 5297500 sejorued pue au se pasney SI weas pue eui uuu peuornipuoo Aq ju
13. s d eu sesa uome1jedo en eA 19612 u uey eunjejeduios y sdois uonejedo enjeA 1eDJe y uey 19 0 seuiooeq eanjejeduje WOO y 0 91 JO 2 9 SI Dunes y ugy JAMO s YOIUM ved Saye DuiAjipiuunueq BulAjipiwinyeq SIU 128195 0 1012e es NOILONN 4 94 esn ueo osje e qe re e s 94 10 99 9S NOILONNA y esn se jd y JUeM ueuM 94015 uol nq 4015 1918 eui 55 NLHV1S yJOM Jou s op q33dS 941 AlleolIeuuolne 18 195 S q33dS 34L ASIGINNHAG O sejeoipui Aejdsip eui 1291 os 10120 5 94 55 IHOWLIH YJOM JOU uonounj eui 2 91 Jepun S ueuM 091 1340 S y Bul Jipiuunu p esf NOI1VH340 INIASIGINNHAG 01 IM 150 uey si pesn eui Ssejnuiu OZ SI JO euin eu puooes pue uo spuooes ul
14. y Bung yeis gt eJnjrej 9jeoipur jou op 941 Im spunos 22 10 BuissiH peeds ug eui S 4 Pe 490 q SHUN Joopino pue JO JO ou uomeJedo y suonisod JOM ey OU Sp UIUM 1284100 u q 510 e uozuou BACH OOD 100 SBOP U u A 9 qeuns 195 y S 1SnD pe xoo q OU S eui ejdsip n9 Aue oq y peeds 1eseJd Jo 0 sies peeds eui jeu 5 amod y S Saye deejs y s 440 NO 24 passed s 43315 U H NO 49489Jq OU S jou seop ueuM SjuDi 400pui y jo HJNIL 94 NOJ JO eDejoA eui S pue si e jun ypu asn eui S ssejun si euin 195 y jou UN y P
15. mE ______ RED TERMINAL TERMINAL BOARD D BOARD EL L BR x INDOOR INDOOR UNIT UNIT 19 CIRCUIT DIAGRAM MODEL RAS 18YH6 RAS 25YH6 XH3P Top Control P W B
16. uonejedo y uoee 0 G JO yun JOOPINO eui Jo 1eeu y UO 1504 UBYM noy ue eouo pewWJOLed eq iw Bunsouj d uolinq dOLS LHVLS D eui sseJd Ajuo ui ui 5 sv m uoneJedo dojs uoynq ssaJg d q e 40157 spes uonejedo dOLS 1HVLS eu ssexa LHWLS uo Buipu d p jenjoe y pue Dunes 941 ay ejdsip 3Hn1vH3dWal 9ui eui 18S IHOVLIH Buluu B q au ye Iuo e jaa yng Ayyoinb WOO ay se e9IUIOUOOJ IH INO U9IUM y JO y peedsuejeu OLNY eui Ae dsip eui 03385 NV4 eut qaads NV4 eui 195 1v3H sojeoipui ejdsip eui 120 OS 10129 5 94 SSaJg IHOVLIH eJnjejeduue JOOPINO y JO N G e oqe siu esn
17. y 1sn pe Buiooo 10 eyeudojdde aui 12eJes Jeuonipuoo eui seDBueuo Apuenbesqns eui j JoWUOW 1 jeeu aui 01 5 eui pejsn pe seu 3y ueuM JedoJd au uano BOIASP eut 151 S OLNV ueuM WOO 1ueJJno y uo Buipu d p 1002 JO WAH uoneJedo jo eui pajosjas seu OLNY ueuM eui Aejdsip eui 120 os 10 98 S NOILONN 4 94 sseJd IHOVLIH S MLA e1nje1eduJue y UBYM pap j s eaunjye1eduJe WOOL eniur y uo Buipuedep 1009 10 IVWAH y AjjeoNeWOINe 941 NOI1Vd34d0 JILVNOLNY JOS SI d S JO OWI jou SI olluoo 2 s jes eseejd ueiseyu anba Jou op L 30N pue SnolA 1d YUM
18. 1ueseJd y 40 2IA D BU 195 UBD Ceo Ae dsip uo syullq 440 uonnq 43 1 1 330 eui sseJg TAONVO AAYASSY YAWIL NO 330 NI 2 qd W d W NA NS 4 H soueyeg y Z N 7 t 95 jueuno HLNOW AVG ANIL H3NI1 pue eui 199 L yuon 3 13S 0L _ 10 Suluouu e 10 2 JO 4 eui BSN JOU op eui eye Z Jo spur 10 s n yeq pjo pue MoU esn ou od MOE JO 0 pue usng V vy eseo eui ul SyJeW eui pjnous eui Jo eu 1 MAU y eisu Seuemeq pio eui no pue y ui UMOUS se 19409 y SAOWAY 93110891009 3101438 FHL NI S3IH311V8 39NVH9X3 OL MOH oSv 1108 eden u uAA 209 261 moge E9I149A ueuM pexy1euJ pex1euJ sI eui 10 s y 104 eu eu 1snlpe y eui 1sn pe 10 99 J D y JO
19. shall I TT r ae oza l acorz Po riran me Ras z201 e 2 a wee TT Fe _ _____ L1 LLLL Rae 2 a wee TT coos oe oso 155 a w w paso faluja C1 Sp seen ess alles L T r sr nee al osi _ 2 L r ETAT FECI a m roszl acorz al wae n vu R001 Hoar ere S E E E E foar L s amna TT Rooz 2 2 1111 REESE E ETT ERI echte ede Por pp REUS IDEE ds H HH Roos seo 1 T 375 a urs w Roos spa swa ooze ars holo else T TT TT 2006 ix Rao 100 w so EE E 2007 100 sw i reos weal cis I TT Roos z ok s LIS 0 82 8 11 ero T TT 4 _______ __ eere eee i mor s k anlal aluh mas wre T LLELLLL T TT Moor Moon mor ax mpa a w e mas wre S ER a s ww fie
20. 57 6 7 Outdoor DC Fan Motor control circuit Motor coil RC Filter aa aaa aaa MAIN P W B 1A FUSE noO T DH 7 a ad 15V C100 e Yl Z lt i Qs lore eu 5 C C i i i gt PWM control voltage x wi T CN24 X 7 A Control Board Ap TV B CH DC fan motor with control board 5V Ww AT EE i xr d 7 R105 24 HIC i C2085 r Microcomputer 5 V es R283 O ot 1 FAN Id 46 31 oO Y 1244 T _ O20 Tasas m pA EMC HOP OV R298 Tren 53 60 e M FG PULSE INPUT pero b UT RE A M au ee RAC RE ANAS ERR tU UM LL ELE e I DU MD t m This model uses DC Fan Motor which has a controller circuit built in the Motor This DC Fan Motor will rotate by control voltage apply to Vsp input Voltage range 1 7 7V DC Vsp high Faster Vsp low slower Vsp lower than 1 7 stop Motor will output FG pulse by following this motor revolution Outdoor microcomputer will output PWM control signal from by following the instruction from indoor microcomputer This PWM control signal will convert to Vsp voltage by smoothing circuit R242 amp C209 Fan motor will start to rotate when Vsp was proceeding over than 1 7V and generate FG pulse by rotation speed FG pulse will feed back
21. eui Aj iqeijoa d y eui 198101d o jou y 1340 OO SI 1 U UAA Jepun si y JO eui 951 NOI1VH3d0 9NIIV3H 0 p ds ue y ejnjejeduua Sy uomnejedo y 104 e1njejeduuo s d eui IH u slue s uonejedo z uq 1461 Alan 195918 y sy Jo y peeds ue 941 y 104 uone1edo Duneeu Burooo y ul Jes s peeds o1 v ueuM uoneJedo dois sseJjg deeq SEIS qOLS LHVLS D 941 sseJg 40157 aan 1seDuouis eu iH amp uognq Q33dS 94 sseJgd einb AION I lI NV3 sojeoipui ejdsip eui Jeu os 1012 95 NOILONf1J 94 SS ld IHOVLIH JeuJuJns JO pue y 1e JOOPU y JO 1017910 u o
22. 505 inu 135 H Oscillator L752 16080 025 R124 100 5 1 16W 042 C R506 10K 2807 4 3K 5 1 16W 038 C UT C621 Circuit s Model Drawing s Z Switch CN12 7 125 30K 5 1 16W 029 C R507 10K C 8621 1K 59 t 100 033 C R810 680 5 x C631 1000P 50V C 047 C Symbol MELICA Circuit s Model Drawing 761 16080 025 C132 0 tn 25V C 045 C LS R126 30K 5 1 180 029 C R508 10K C R631 1K 5 1 8 012 C R811 2K 5 TETTE T C651 0 10 25 045 C ENS umper RES 1 057051010653 0MHz 107 R nit No ds L762 1608601 025 C R127 5 1K x 596 160 040 C R509 10K C R641 10 5 1 16W 030 1 R812 39 X596 AU C711 0 1g 25V C 045 C Circuit s Use Dau Buzzer SW1 EVQP07K SW 132 H L763 16080 025 CN15 PH 5P Top BLK 124 H 8131 5 1K 596 1 80 020 C R510 10K R642 1K 033 R813 39 5 C712 0 045 C Symbol Don t Use 2 part s 0 5 L764 16080 025 C R141 2 7 5 1 10W 015 511 10K R651 033 C TOE E C713 0 140 25V C 045 JW101 Use 608 ME Model R512 10K C R652 100K 042 R821 1K 5 1 160 033 C Xu C751 tev C os JW601 Use 1608 l E ln Zener Diode 801 100 55mAl111 C R513 10K C R653 1K 033 R822 10K 1 1 108 017 C C801 150P 50V C 048 C JW
23. No Yes Check the refrigerating cycle In the event of overload limit cut or OH thermistor temperature rise use the self diagnosis memory function because such failure may evade detection due to Check the outdoor ambient temperature variations or other factors electrical parts J Check the indoor q electrical parts 71 CHECKING THE INDOOR UNIT ELECTRICAL PARTS 1 Power does not come on no operate Is AC220 230V being generated Is AC220 230V being generated at between terminals A and B on the _ outlet eae i real 2 indoor unit terminal board pias Yes Check the power cable power switch and terminal board and x repair any defective part Is DC35V or 20V being generated Is AC220 230V being generated between terminals C and D on the between terminals A and B on the outdoor unit terminal board indoor unit terminal board Check the indoor outdoor unit connection cable and correct any Yes defective section wrong connection incomplete insertion Is DC35V is being generated between terminals C and D on the outdoor unit terminal board J Are and D connection cables Connect the cables correctly Check the outdoor unit power circuit and repair any defective part generated normally N 12V line 12V or 7V 9 5V line 5V Check according to the proper method for checking the power circuit x Yes Yes Do the air deflect
24. 2 approx DC 235V x PL ROO3 Detection resistor G5 0e j R004 ROO N DC current P R906 SE R613 S 5r c Microcomputer OV OV R612 62 va 5V ES N C ov ov 151 p 5V T N R248 c R245 61 14 tT SE 1 4 N N 5V OV OV OV a S er R222 OV d 29 6015 009 ROOS e 77 2 o O ov m tx OV OV OV OV R287 D208 19 STANDBY output R284 R286 O lt Fig 6 1 Peripheral circuits of microcomputer Table 6 1 Detects DC current flowing into power module and when over current Peak current cutoff circuit instantaneous value flows stops lower arm drive circuit and creates lp signal to stop microcomputer at the same time Protects compressor by judging overload status based on input current DC current and DC voltage Reset circuit Creates reset voltage Overload control circuit 49 Reset voltage 9 Reset circuit approx DC 235 V Chopper 6 DC voltage signal T had S Compressor or Dividing resistor gt Drive circuit 5 gt motor o Input current 5 2 Ip signal Peak current cutoff circuit DC current Detection _ _ __ _ Fig 6 2 Detailed description for the operation of each circuit is given here 6 1
25. y JO MOPUIM CUBIS 11 99915 uay pue 5 Jo Jequunu y 10 HUIYJOM 84 aw d S Jo d S Jeuui d S sinouy sinoug sinou z lt nou IHOVLIH 5 se y pue uogung 43315 G y sseJg euin jueuno y 10 seDed eui ees 195 10U SI 1I JI 151 YE JUNI eui 198 d3INI1 d331S AHL 13S 01 MOH epe B Jo4e98Jq y 40 UN 10 y YO YOUMS UN y JO ouA eui Kup pue aui UO pey 1noqe JO IH peeds uej eui pue NvJ uonejedo y Dunes Aq yun y uny 330 SNOT dO S NINNIS38 LV SONVNALNIVIN ji inooo jne4 eii INOYWM eui eje1edo u0q Mullus ACW eu UNS BU 11 JOU op epeus y y pue suNnjsioW exeus 41 uSuM Buneoo eui pue eoeyns onsejd esneoeq ulus 991 5 0 ULY Je JOU USEM JOU p 10 Jeuuiu auljoseb euizueq J91eM NOILQVO V 11045 esneo siy se yun y y 1942M JO use ds
26. Air suction Fixing hole for anchor bolt 2 012x16slots for 28 0 bolt Notch for anchor bolt for 2 08 bolt 300 25 v More than 200 More than LO 010 4 16 MAIN PARTS COMPONENT THERMOSTAT Thermostat Specifications 7 65 7 3 66 7 TEMPERATURE 26 7 80 1 F 27 3 81 1 34 7 94 5 35 3 95 5 FAN MOTOR Fan Motor Specifications MODEL RAS 18YH6 RAS 25YH6 RAC 18YH6 RAC 25YH6 POWER SOURCE DC 5V 35V DC 140 350V 25W 35V 0 E OV WHT CONNECTION YEL BLU Control circuit built in BLU BLUE YEL YELLOW BRN BROWN WHT WHITE GRY GRAY ORN ORANGE GRN GREEN RED RED BLK BLACK PNK PINK VIO VIOLET MAIN ELECTRIC COMPONENTS FOR OUTDOOR UNIT NAME RATING APPLICABLE MODELS REVERSING VALVE COIL 135 Q 20 C RAC 18YH6 25YH6 REACTOR L1 13 mH 0 224 Q RAC 18YH6 25YH6 REACTOR L2 25 5 mH 0 37 Q RAC 18YH6 25YH6 FILM CAPACITOR 45 uF RAC 18YH6 25YH6 7 COMPRESSOR MOTOR Compressor Motor Specifications COMPRESSOR TYPE ASCO92CD POWER SOURCE DC 270 350 V OUTPUT 800W WINDING RESISTANCE 0 YELLOW COMPRESSOR FRONT SIDE OF OUTDOOR UNIT ACAUTION When the refrigerating cycle has been operated for a long time with the capillary tubes clogged or crushed or with too little refrigerant check the color of the refrigerating machine oil inside the compressor If the
27. Bit No B Character No ____ D NO S A NO S N Jewod 5 614 1 55 Od M 103 2009 AV13H e 19 R008 N C022 O 35103 aavoa E l I 1011 4 JeMod 1ueBi Jolu We JAMO 3U M pue A wue Jeddn eu M pue eui ul einpouu Jamod JO smous e 614 n3119 Intelligent power module switches power supply current according to position of the compressor motor rotor The switching order is as shown in Fig 3 2 At point Ut is ON V is ON circuit in Fig 3 1 At point U is chopped OFF V is ON circuit in Fig 3 4 vt wt yt ID D a _ Upper arm WA i x I U ee V W x y Lower arm transistor SU U Fig 3 2 Switching order of power module Upper arm transistor is controlled to ON OFF by 2 5kHz 5kHz chopper signal Rotation speed of the compressor is proportional to duty ratio ON time ON time OFF time of this chopper signal Time T in Fig 3 2 shows the switching period and relation with rotation soeed N of the compressor is shown by formula below N 60 2 X 1 T Fig 3 3 shows voltage waveform at each point shown
28. ST 13M LNOG uepiooe jeze esneo p no2 siy 19M eui ereJedo 1dujerie 100 W Koueroynsui WOO eui sjueuudinbe Buiuunq eui Bunejedo ueuM esn pepueiui Aue 10 JOU pue eui pado eq j eus eu yns aunydnu e jou Aq peseajJoui eq ues 5 eJds e sy spun Joopino pue JOOPU uloq jo y JO eq JOU pinous Jeujo pue sued y uanj JO do y 12euuoosip uuois uepiooe Jeze esneo siy am asn se esn jou NOILVdsdO SNIGNG SNOILNVOAdd NOILNVO V SNINHVM V esneo peeds uDiu eui esneoeq epis pue eui exi sjoefgo 1nd jou liie s JO YOOYS eoujoeje ue esneo jo asn jnsaJ ejqeo y jo sBuiui y 1nd JO sseooud y yeay uo 1nd 4 jind ejqeo eod y ejpung Jou JO
29. ay 5141 jues si euBIS e UBIS uoissiusueJ OY u uA 99 MOPUIM SIU ubis 55 5 jeubig E N AAIGINNHAG M L7 7 RINE CE N IHOVLIH e IHOVLIH ejeuedo pue puodsai spuooes 0 uinb i y BU MAU Ayyjiqedeo uoissiuisueJ jeubis sy 10 YUM y Je o4juoo y eq ULI yun JOOPU y ens y p piAoid By uo eq yun 514 eq 10 5 y seseo eulos eq ojuoo Jo eBuei y si 100pui J 5 SI 241 jun JOOPU y jo eui SIU YATIOULNOO ALOWSY SNOILINAA SNOLWWA LuWd H9V3 40 SNOIL NN ANY S3IAVN 3y ui Juaseid ejdoed u uo eq jou
30. eui SNOISN3INIQ ANY 3IAVN 13000 So es 1no yse eseo d A u 1 jue uay M dej Buluuni sapun esuu 1972M JO edid pue usnq eui apis u jo uonoes 19401 Aq saw 02 dn pue ejqeusew Burzuopoep pue uo Bunu si jun PESCA 5 amp 5 euu uonog 9UJ J4 pesn ole ul ezoeJj esneoeq yun ac EM uod 519 Buizuopo p pue 5 JOOPINO y JO uod urep eui JOU OG 2 1 SS z peeds buljooo y pue peuexeew Anubis si eu enp l e eureJl JO ejesuepuoo uomnejedo ul qT VE UMOP syed 2 y 0 spuooes 5 pue sepis uloq sii 09 OL 40 Buluan m T ff Aq y pue eui a JO uej y Pun pei JO 8 Duunp si dols u uAA gt 9UJ84J 19 l J BY 55 Buiziiopo p pue y Durgoen y JOOP NO y Inoqv HA s y sepis pue Sl
31. os TQ MICROCOMPUTER GREEN 3m 4 1003 1002 SWITCHING POWER SUPPLY Main parts 1 DB2 The DB2 rectifies the AC voltage The possible causes for the DB2 failure are as follows The 15 A fuse may be blown out or the IPM for the main PW B may have a failure In such a case check the 15 A fuse for blowout and replace the main P W B if necessary DB3 L1 C023 and L2 The 083 L1 C023 and L2 shape waveform of the input current When the current runs through the L1 is taken for 1 and the current runs through the L2 is taken for I2 as shown in Fig 1 2 1 becomes an input current to the capacitor which peak value was crushed by the L1 and I2 becomes a resonance current which causes the LC resonance using the L2 and C023 By combining the 11 and 12 the input current from the main power shapes a waveform shown in the right side of Fig 1 3 indicating that the waveform is similar to sine wave The more the waveform is similar to the sine wave the lower the harmonic current becomes If the C023 has any failure the protection unit activates and the C023 in open mode In such a case replace the failed parts DB3 L1 l Is A r gt l C023 L2 lo Fig 1 2 Fig 1 3 35 3 C021 and C022 This smoothes the voltage rectified for operating the compressor When the input voltage is taken for the sine wave as shown in the top of Fig 1 4 itis rectified by the DB2 and becomes the waveform as show
32. 2 WAIT 1 MINUTE AT LEAST 4 PRESS THE SERVICE SWITCH WHICH IS ON THE PWB MORE THAN 1 SECOND SERVICE OPERATION WILL BE STARTED TO STOP THIS OPERATION PRESS THE SERVICE SWITCH AGAIN MORE THAN 1 SECOND TO RESUME TO NORMAL OPERATION CUT THE POWER SOURCE ONCE THEN ON AGAIN N ORDER TO PROTECT THE DAMAGE OF COMPRESSOR DO NOT OPERATE MORE THAN 5 MINUTES WITH SERVICE VALVE CLOSE PEAK CURRENT CUT ABNORMAL LOW SPEED ROTATION SWITCHING FAILURE OVERLOAD LOWER LIMIT CUT TEMP RISE THERMISTOR ABNORMAL 5 ERROR NORMAL OWER URCE EEPROM READ MAIN P W B 7 mus SERVICE SWITCH 69 OH THERMISTOR DETAILS ROTATION TIME THE ROTATION SPEED 15 AUTOMATICALLY CONT ROLLED TO PROTECT THE COMPRESSOR IN THE OVERLOAD CONDITION MICROPROCESSOR WAS REBOOTED IT 15 NORMAL WHEN POWER SW HAS BEEN TURNED ON COMPRESSOR PEAK CURRENT WAS BEYOND MAXIMUM LIMIT LOST THE COMPRESSOR ROTOR POSITION SWITCHING FROM LOW FREQUENCY SYNC START TO POSITION DETECTION OPERATION FAILURE OVERLOAD PROTECTION FUNCTION IS REQUESTING LOWER SPEED THAN MINIMUM SPEED OF COMPRESSOR COMPRESSOR OVERHEAT WAS DETECTED BY OH THERMISTOR ABNORMAL THERMISTOR VALUE OPEN OR SHORT WAS DETECTED COMPRESSOR WAS NOT ACCELERATED MORE THAN MINIMUM SPEED COMMUNICATIONS BETWEEN NDOOR UNIT AND OUTDOOR UNIT ARE INTERRUPTED ABNORMAL POWER SOURCE WAS DETECTED OUTD
33. a x AG LN aig ar 5 G G a o m OV Os FM ROTATION NO FB 24 DC FAN OUTPUT OV Micro Computer Fig 6 1 First 35V power which operates the indoor unit is generated by the power source section of the outdoor unit and supplied to the indoor unit through the C and D lines of the connecting cable Second use the DC DC converter and the 35 V power supply from the outdoor unit to generate 12 V control power which drives the stepping motor during the operation In addition use the regulator IC 121 to generate 5 V power required for driving the micro computer and controlling fan motor If the terminal block was overheated due to a connecting cable improper connection the thermal fuse built in the terminal block will burnt to shut off the 12 V line and stop the operation of the indoor unit Then the outdoor unit cannot be communicated with the indoor unit and a communication error occurs the outdoor LD301 will blink 9 times stop all operations 33 7 Fan Motor Drive Circuit Micro computer DC fan motor output DC fan motor Speed feedback Voltage at point Waveform T1 Low speed T2 High speed Voltage at point B Waveform Voltage at point Waveform e Forthe point A 15 7 kHz PWM pulse will be output from the pin on the micro computer as shown in Fig 7 2 The pulse range will vary with different command speed e The pulse is converted into the analog voltage by the
34. 514 BSF ue se jduuis eu BSN UBD NOILVH3d0 NWA uolinq dOLS LHVLS D eui sseJd Ajuo y ui ui 5 eui sv m ejnjejeduue WOO 1ueJno eui 9y 1es se uoos se yes M uonounj eu 81461 dwe NOI LVH3dO eui yBnou ue e WOO uano eui 40157 uey J uBiu si y 5 JOU seop uonounj N LHV1S y dois urepe ay 55 d q e ses uongejedo 4015 1915 eui 55914 Suomnpuoo uo Buipuedep woo jenjoe y pue Dunes 941 eui seyeoipu 3univH3dW3l Ou eui 18S IHOVLIH 8J0 AN A xoinb 000 IM S 24 seu 1eseJd eui u uA pue 45112 S 03385 941 OLNY Q Bumes y eui uollnq q33dS q33dS NVJ eui 19S 1007 sojeoipui ejdsip 120 OS 10129
35. e M wy Bees zu CURRENT SELECT iesu cuRRENT SELET ED dio i Se RESET REMOTE CONTROL D SELB 4 S V SDASCLRES OV Indicating P W B lerle pale REMOTE CONTROL D SELHGt 242 pei STSTS L5 4 AX 7R13 POWERFUL 0 TT CN6 CLOCK KEEP rla 9 OSCILLATION gt PH 11P Top NMII 5V pa C ELLTER raid R51 5V12V Terminal for EEPROM TX SPO WIRELESS INPUT _ c OPERATION 439 CZ 12P To data writing L FM ROTATION NO F8 I gt 9S1 9141 Heat Exchng 8 s 2 5 S m R651 pees 1 z 2 ires 34 E E T s Room Temp 9 V m E cm Ed FE m aa Test SWEEP1 AUTO swEEp2 Z Eeprow S z eo L bd x co 5 gt 5 278111218 lis v 9 ne te i 5V 4 5 E s 5 OV O To SDA ERE 12012 124 23124 128 LILI 313 1764 SCL IG 4 y y 8 20 Be 8767 763 C402 Vour Light receiving yoy i RES Ed WWW 7 6 4 Ouni o rr R766 L762 LD202 Timer IRR OV CD ES p AAN A 6 7 R765 L761 p M GND LE 0201 Operatidn e BEEN AAA OY Y OV O 10203 Filter CN7 I T L O i c2 2 GI D XH 4P Top BLK 5 E SW I Room temp s 3 1 Terminal M2 3 0 Temporary Sw R701 2 AAN R211 V OV CN2 CZ 12P S
36. eui ISNP Jo nJ SI eu eseo AluBnoiuoul eui 470 9 Saye y os Ag y eJns UO 99 YOS UUM ediM parowa JOU SI ueuM HH iv L jenou aBuods YOS e USPAA pue eui A ddns eui dois Buiue 5 euosJed eoriues Aq paleo eq snu pue TANVd LNOtid dO Z Nouunvo Y J9NVN31NIVIN _ 12 UO SI eui UBYM AJLA 8U JO SION esiou sew 11615 se yons Bulbueyo uidi sue yun 1oopui esioN seDueuo eunjejeduie enp 5122 2 JO spuedxe y SION esiou Buiyeenbs esiou Bulyjsny pejsn pe SI punos JO edid eui ui esiou 1ueJeDujeu sp q s jun 94 uoieJedo gt sdojs pue eseoj gd Buuedeud si jun au
37. piezeu yoous 21 icine um id daay oj j0sseJdujoo eseoJoul eui uoneniis Jo pejoeuuoosip si eui quee enois e sn jou 4205 Ul OSI Ayjiqedeo samoj sjeD X p lsni sey owed y J 925 2945 1294109 jueiquie eui sy eq WOOL suq pue yeay squosqe ey uieis s e sezi n SIUL u q sey s yun eu JI 295 o 42942 NOILNYV ARRAS E d ea IO9VLNOO A1HV3A HO SLNIOd SNIMOT1O4 AHL MOAHO 3S V3 ld NOIL93dSNI HV 1093H NOILVINHOJNI e s lueduuoo Ajddns 220 y JO suomnipuoo eu eouenbesuoo JO SI SIU n290 sseujuDuq 14645 2 si 146 y enoed y uo 5 uo 9jou 5 y wiy os e 5 Jo y jo uae noA suonoedsuri aui Jaye Ajjeuuou oe1eJedo 0 5112 15 eui jueDe INOA 122 02 esee d eui
38. 5V voltage rises and reaches 4 4V pin of IC521 is set to Hi At this time the microcomputer starts operation When power OFF voltage drops and reaches 4 2V pin of IC521 is set to Low This will RESET the microcomputer _ 30 2 Receiver Circuit 12V Q141 1201 R212 S R141 20141 VDD C212 _ C211 OV OV OV E 43 RECEIVER I P V R211 R611 dd C611 PH Microcomputer GND OV OV Fig 2 1 IRR light receiver unit receives the infrared signal from the wireless remote controller The receiver amplifies and shapes the signal and outputs it 3 Buzzer Circuit Microcomputer Buzzer output 80 Fig 3 1 Buzzer circuit When the buzzer sounds an approx 3 9 2 square signal is output from buzzer output pin GO 22 of the microcomputer After the amplitude of this signal has been set to 12Vp p by IC711 it is Metal diaphragm Pizoelectric element applied to the buzzer The piezoelectric element in _ the buzzer oscillates to generate the buzzer s pu qe m sound 4 x SAP V V Sound wave TP lt NN i i k gt d Fig 3 2 Buzzer Operation 3j 4 Auto Sweep Motor Circuit 12V Auto sweep motor for horizontal air defectors Microcomputer Fig 4 1 Fig 4 1 shows the Auto sweep motor drive circuit the signals shown in Fig 4 2 are output from pin 5 8 of microcomputer Micro computer pins Step width 10ms Horizontal ai
39. B58 6 3 Reset Circuit lt t Microcomputer ed N c c er een E d LO o e N c c R288 Fig 6 10 The reset circuit initializes the microcomputer program when Power is ON from OFF Low voltage at pin 7 resets the microcomputer and HI activates the microcomputer Fig 6 10 shows the reset circuit and Fig 6 11 shows waveform at each point when power is turned on and off When power is turned on 12V line and 5V line voltages rise and 12V line voltage reaches 10 9V an reset voltage input to pin 7 of microcomputer is set to Hi Reset voltage will be hold Hi until the 12V line voltage drops to 9 90V even though the power shuts down 12V line 12r 10 9V Z O gt o S gt 6 5V line a 5 Reset voltage Time 12V line 12 Power is OFF Voltage V O 5V line Reset voltage 0 Time Fig 6 11 54 6 4 Temperature Detection Circuit O H thermistor v e o 304 5V R301 Y DEF thermistor OV Microcomputer r 1 AX 8V11 R305 e 303 5V R302 Y Outdoor temperature oV thermistor ANI eum 1 OV ___ gt G3 R306 Outdoor N temperature C302 R303 Y Fig 6 12 The Over heat thermistor circuit detects the temperature at the surface of the compressor head the Defrost thermistor circuit detects
40. R751 and C751 and applied to the fan motor as the speed command voltage Fig 7 3 shows the relation between the voltage at the Speed point and the speed Some differences will occur min due to the condition of the unit e The fan motor outputs the feedback pulse of the speed 0 1 2 3 4 5 which is input into the pin 4 on the micro computer This Voltage at point V pulse is equivalent to a frequency of 12 60 speed Fig 7 3 Example 1000 min 1 x 12 60 200 Hz The micro computer monitors the frequency and adjusts the output pulse range of the pin so as to keep the command speed e fthefeedback pulse is 100 min 1 or less due to a locked fan motor or failure the fan output will be stopped temporarily as fan lock error After 10 seconds restart the output of the pulse If fan lock error is detected twice within 30 minutes all units are stopped and the unit will come in the failure mode The timer lamp will blink 10 times 1400 34 MODEL RAC 18YH6 RAC 25YH6 1 Power circuit This circuit is to convert the power from AC which is provided from the terminal A and B to DC voltage And produces an AC current which does not exceed the harmonic amplitude limit of the IEC61000 3 2 When the compressor is stopped the AC voltage becomes about 300 V and while the compressor operates it is about 280 V TERMINAL MAIN P W B e _ GRAY S2 AES E DEDE 3 6 L1 BLUE L1 e
41. au SI WOO y ey JO y 104 uonipuoo Jepun 10 op 810J8J8U eunyuJnj 4no 19M 514 umop NOLIgIHOHd sdp pue jojoejjep y uo esuepuoo poued e ed JO umop Hure pue 08 5 SI Ayipiuuny Wood eui pue JOOP y y ueuM uo s o qo JO y uo quuip 10 oq JO Sjue d y JO SI Se BU Jepun Jo s uejd aoed JOU 4oous 21 esneo pue 1uesaJd eq eyes eouie 3 lun JOOPU uo SLA ES Se uons Jeure1uoo J8 eM e eoejd JO PUN eui YSeM 100 oq esneo pue sdejjoo JOOPINO y 40 J 199Jep pue aiqeis si ewes Joopino ey eseej d eui se uons snyesedde y 1 Aew siu se pjouesnou soe 1euomnipuoo Jre HUILWOD jooo eu JOSIP JOU SNOILNYOJHd 7 AAYASEO A1LOIHLS 1
42. 1 Micro Computer lt j MAIN SUPPLY ON OFF In the power circuit for power supply for microcomputer peripheral circuits and IPM driver circuit and as well as DC 35V are produced by switching power circuit Switching power circuit performs voltage conversion effectively by switching transistor IC1 to convert DC 330V voltage to high frequency of about 20kHz to 200kHz 47 The voltage specification of the power circuit is as follows lt Check points gt Output Voltage Main load points Potential failure modas Spec 11 13 MAIN PW B 25 12V ger J28 OV p LD301 blinks 3 or 4 times then stops 5V 4 5 6V MAIN P W B J20 5V display J28 0V display The unit won t operate MAIN P W B error B 12V 11 16V Expansion valve R25 B 12V display R25 B 0V display LD301 blinks 5 times Expansion valve error 14 17 V DC fan motor CN24 4 15V display 06 side LD301 blinks 3 times MAIN P W B J5 15 0V display or 4 times or 12 times 33 5 38V Indoor unit electrical parts R23 C 35V display R23 D OV display Indoor unit won t operate Terminal C D Terminal C blown line Terminal D red line Indoor Outdoor miss Reversing valve CN2 conection e Check each voltage If each voltage meets the voltage specification above the power circuit is normal f any error is found after checking remove all loads and recheck each voltage I
43. 10199 Jop y JO pue Woy pue y p114 eui epis 1u6IH eui epis ye pue eui peuonipuoo eui 1sn pe pue eui Ul UMOUS 10129 Jep 991 pue 1J eui 0 eui jo jueunsn py doup pue jezuozuoy y UO BWOS Huo e 10 DuiDuiws 10799449P 2 eui d y 1ou op u NOILNVS Y Sesoj 1e ino y y 1e sdojs pue JOJO9 JEp jejuoziuuou eui peddois s eui ueuM juBu y uwous e6ues Bunsn pe y uiui 10129jJep ejuozuou eui esf 0 SEIS 10 2 y e10jeq peuinbeJ eq spuooes jnoqe spuooes e1eA egS uonisod 1u uno sil sdojs 10199Jjep y s uoynq au j uwop pue dn sBuiws eyuozuou eu eouo passaud si OLNY _ uogng ONIMS O1nv C X eui ejDue eui 1es osje pue A snonunuoo umop pue dn eq ued J0 99 Jop 941 uoneJedo e qeiins jedoud eu 01195 si 10129 Jep 0210 94 du ui y
44. 2 2 ff l cos 560 77 2 cows ___ DIC114YSA M co i pee ___ _ 1 cos 25 n core ooz lul a a a 1 UR tata PET od i mina 10 330 25 0 2 1 2 R283 A v 16 o1 80 7 i d m R10 reps al w 31 RN2207 Ez 11 Dep 31 c21 o olcl aR mez RN2207 c23 470 RN2207 JE mu e Rer mu E I C008 C013 YE Isl lt 1 HH 22H 1 H49 4 H 4 AS 11040 ___ __ TT IIT a ve Dr Pati SYMBOL SYMBOL _ j SW TRANS euo zz paw 1 LI LLLLTT 1104 J Cee J TITI per sss METRE IEEE Ds fw west us __ TIT T oss w w es AH R24 I EI EM ET SI EIER wa E R25 27 ho lt poz 1 4 Eier oos ione pnm Ezra peee CIT RN c 1 C002 0 4 ve gt alu __ oo ox eve I4 wu __ es TIT T1 LLELLLIL p az ___ _ Per
45. 20 REACTOR2 21 FAN MOTOR SUPPORT 22 FAN MOTOR 47W 1 4kg 23 PROPELLER FAN 24 NUT PROPELLER FAN 25 SIDE COVER L 27 FRONT COVER 28 DISCHARGE GRILL 29 ELECTRIC PARTS PLATE 30 ELECTRIC PARTS COVER 31 TERMINAL PLATE 32 TERMINAL BOARD 2P 33 HEAT SINK REGURATOR1 35 FUSE 15A 36 FUSE 3A 37 VARISTOR 38 P W B MAIN 39 FUSE 1A 40 SUPPORT P W B 41 CAPACITOR 45 F 200V 42 COVER OUTDOOR THERMISTOR 43 HWRAC DIOEX A17 1 THERMISTOR OUTDOOR TEMP 44 SIDE COVER R 45 TERMINAL COVER 46 TOP COVER 47 SERVICE VALVE COVER 50 DRAIN PIPE 51 HWRAC E10H2 A29 1 COVER CAPACITOR O0 IN O O1 09 92 HITACHI RAS 18YH6 RAC 18YH6 AW NO 0019E RAS 25YH6 RAC 25YH6
46. 25YH6 RAC 25YH6 COOLING DEHUMIDIFYING DEFROSTING i OUTDOOR UNIT INDOOR UNIT 49 52 48 0 Silencer 8 0 pte J lt C C Service valve Reversing 3 8 Single ended union valve lt d Oz 9 52 ON CE 7 ES 8 FL v n Charge port 6 35 Electric Expansion valve 6 35 Service valve Single ended 1 4 union m 66 35 1 4 6 35 h 3 Strainer 6 35 HEATING OUTDOOR UNIT INDOOR UNIT 49 52 Silencer o Service valve Reversing 3 8 Single ended union valve m 9 52 3 9 9 52 8 LE H N Charge port T 1 1 2 9 52 8 0 6 35 Electric Expansion valve m 6 35 Service valve FSI e andea mm 1 4 union ny 46 35 1 4 96 35 beeper 4 Strainer 8 Strainer 1146 35 29 DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAS 18YH6 RAS 25YH6 1 Reset Circuit NORMAL HI RESET LO e Microcomputer H552 C521 C522 C524 IC521 OV Fig 1 1 Power OFF Power ON a d Voltage Voltage supply to pin of 10521 Reset release at 4 4V Reset enter at 4 2V Voltage Voltage at 7 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
47. 95 94 SSaJg IHOVLIH eui JO y uo eulos 5 08 1 yy AJOA SI J eer 91 01 SI 100pino By UBYM JO esf NOI1VH340 9NI1009 uul 1xeu y esn oj si uollnq 3AH3S3H I y sseJd e eu y ui ui paJojs eu Sy 80U819J9J 2 S BSNeDAQ 151 12 euin 1ueJno eui 18S 440 JJO NO pue sAem eq OU ejejduioo MOU seuil jjo uo uin ure 00 1e uo peuini Ajduuis Bu Ajipiuunu p pue 104 HL w FAS we 00 7 1e peuoeai eq ainyesodwe LIL w s d eui os UO u u pue o wd 02 0 1e UN y Buile u 104 1 4 gig EP boi E ejduiex3 1 Fig Fus LIT nu Q lt J Wa IL yun JOOPU uo 51461 eu pue 5 d q y 51401 q3AH3S3U pue jo pe lsu Bugy i seis NO SUL 3 AH3S3U ssesd pue uollnq 041009 94 UN BU ejoulaJ BU JO MOPUIM eu
48. Check to see if the connection cables are at pin 5 relative to OV at disconnected or reversed pin 3 of CN3 If normal check the outdoor unit Is 12V or 7V being output ls ICP4 normal ae Replace ICP1 Check if the air Normal if it is less than 10 Blown open if it is 100 more deflector motor is shorted and IC111 0111 C114 20121 are defective Yes If shorted defective ICP1 will be Normal open again at relative to OV at of C114 Yes Open Has the terminal board Replace the terminal board thermal fuse blown open gt Insert the connection cable securely No Replace 0111 and IC111 Replace IC121 Check if a short Is DC5V being generated occurs in the 5V line If the 5V line is shorted ICP1 will be open again Perform final operation check x1 When the unit is not in operation the voltage across the 35V line may drop to 20V X2 When the unit is not in operation the voltage across the 12 V line may drop to 7V 74 CHECKING THE REMOTE CONTROLLER Is battery polarity correct Install the battery in the correct polarity Is the battery check sign flashing Replace the battery Turn on an AM radio bring the remote control switch within 15 cm of the radio and press the ON OFF button Check the LED D1 with Does the radio buzz noisily a multimeter Check the indoor unit signal receiving P W B If itis good
49. N v Spuooes 01 ul Ajjeonewojne 1eeddesip slue1s uoneoripur liM uoneoipui eun euj y uonnq uol nq uollnq 3INI L INIL ss id r JUBIND y 195 195 48uJl 4 JO NO Puke 1 1 Jeuun J JO 24 Jo euo AjUO 19S UBD BON un 9y uo yo suuni dwel YAWIIL C pue deeq jno seob uBis 3534 eur uollnq 133ONVO eui ssaJd pue BU JO eUBIS y JUIOY 5 MOH Bulyoyims 7 jo eouenbes y sejeoipur y Buueedde ou Mis yey euin s d O pan lt XX PON 2 y 1e 152 sino5o 991 To DE Y por y 1e uo pue Jo UO au uollnq syuljg xeu NO 1 84 9 999 I eursseud Syullq c pue 5161 440 uognq 440 eui y yey os 04109 H3INIL 94 os YAWIL 941 sseJg eun o un eui 195 Z 440 ss iq L 19 L 440 NO s uun peyeubisap Ae dsip eui y uo un M SOIASP 941 uo NO eu uonng lt H3WIL NO 941 Sseld
50. check the main P W B AM radio You can check the remote control switch by other methods as explained 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 75 Mullq LOEaT dwe sisouDeip jjes eui PIP MOH sisouDeip jjes y BBS YOUMS Joopino eui y eui 9D g pue eui eq osje J uwo q sn3 019 Z JOJSICA OU seu esnj ve eui JI ON v 9U MO HulyoUMS eui S eui 1991105 S SoA JO J pejoeuuoo q pue J ees 2949 uid 1591 81 NO AS uld pue AG S Sued eAnosjep Aue eoe deu S Ie19p 104 N3119 J mod uo uonduosep ees eui S O18 Ndl Ssouoedeo Bululoouus asny ve ZSA Jo1sueA sued soejdey syed 1940 0
51. eoejdeu AG xoidde si 81 0 JO O ewou 1950 eui S ewou Ndl eui S Ji SO ne jou s op Siul p llddns si samod Jaye 191180018 pue 9591 SAemje yun au dois 19594 OU Seul SHUG 10201 82 JUDGING BETWEEN GAS LEAKAGE AND CHECKING THE REFRIGERATING CYCLE COMPRESSOR DEFECTIVE 1 Troubleshooting procedure No operation No heating No cooling Lighting mode su IO ee A 2 times 3 times 4 times 5 times 6 times Stimes power module again and operate the Within Approx Time until the Approx 10 seconds Approx 46 lamp lights E seconds seconds Possible malfunctioning Compressor part Is the self diagnosis lamp mode as YY Blinking o shown on the right Outdoor air temperature CC 50 Gas leakage Compressor YES R410 A The values above are the theoretical ones Normal Stop to operate and check the gas Checking the IPM main P W B pressure in balancing mode Error Gas leaking self diagnosis lamp lights in the same condition as above Gas leaks Repair and seal refrigerant The compressor is defective Replace it and seal refrigerant If the compressor checker for an inverter type air conditioner is available re check using it Perfor
52. 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 effected 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 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 Any inflammable thing should never be placed about the locati
53. signal on the DC 35V line to perform communications between indoor and outdoor units This circuit consists of a transmitting circuit which superimposes an interface signal transmit from the microcomputer on the DC 35V line and a circuit which detects the interface signal on the DC 35V line Communications are performed alternatively transmitting and receiving 2 1 Communication signal from outdoor microcomputer to indoor microcomputer At first outdoor microcomputer will send a request signal SDO to indoor microcomputer 38 KHz of carrier signal is generated and modulated by the request signal SDO from the outdoor microcomputer pin This signal is superimposed to DC 35V line via C801 and L801 To prevent erroneous reception the outdoor microcomputer is designed so that it cannot receive a signal while it is outputting a request signal The receiving circuit in the indoor unit consists of a comparator and transistor The interface signal from the outdoor unit on the DC 35V line is supplied to C821 where DC components are eliminated and is then shaped by the comparator The shaped signal is detected by diode amplified by amp and output to pin of the indoor microcomputer Fig 2 2 shows the waveforms at each component when data is transferred from the outdoor microcomputer to the indoor microcomputer 2 2 Communication signal from indoor microcomputer to outdoor microcomputer The request signal 500 generates by indoor microcomputer is ou
54. speed Compressor Notes 1 The operation is done assuming as the preset temperature room temperature at the time 2 C 2 The indoor fan is operated in the Lo mode During thermo OFF indoor fan will be OFF for 5 minutes and ON for 1 minute 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 Dehumidifying Sleep Operation Cooling Defrost Set to 7 hours Indoor heat exchange temperature gt Sleep button SZ Operation lamp d Timer lamp ZZ Remote control See basic operation Outdoor fan O lo 15sec ERN j Shut o p T _ Indoor fan Hi operation Facing down O Notes The sleep operation starts when the sleep button is pressed When the sleep button is set the indoor fan is set to sleep Lo The indoor fan speed does not change even when the fan speed mode is changed If sleep operation is canceled by the cancel button or sleep button all data is cleared Compressor speed Compressor speed Table 3 Compressor rom Basic Heating Operation Temperature Calculated difference compressor with shift value 2200 min 2600 Heating set temperature Eee control set tem
55. 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 5 This room air conditioner should not be used at the cooling operation when the outside temperature is below 10 C 14 F 6 This room air conditioner the reverse cycle should not be used when the outside temperature is below 15 C 5 If the reverse cycle is used under this condition the outside heat exchanger is frosted and efficiency falls 7 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 MODEL FAN MOTOR FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR COMPRESSOR COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR OVERHEAT PROTECTOR o O m gt O 2 FUSE for MICROPROCESSOR POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL UNIT REFRIGERANT CHARGING VOLUME Refrigerant 410A PIPES MAX 20m RAS 18YH6 RAC 18YH6 RAS 25YH6 RAC 25YH6 PWM DC35V 4 ASCO92CD 0 N N N G N N N NO Z O
56. support 65 Removing the indicating P W B 1 Remove the connector from the CN2 on the control P W B 2 Remove the upper hook from the indicating P W B lock resin pull the P W B forward little and remove it Other Cautions 1 Cautions concerning ICP IC Protector 1 Use due caution for short circuit in servicing Short circuit will open the ICP immediately 2 When the ICP opens remove the cause of this phenomenon and replace the ICP If the remedy is improper the ICP may open again 35V line O ICP2 Indoor unit fan motor 12V Power circuit 12V line O ICP1 5V Power circuit dile ZD121 20V Zener Diode 2 The CN3 power supply and CN10 fan motor are the connectors with lock mechanism Press the lock with your fingers to unlock 2 remove the connector Press here Unlock Lock 3 When checking the voltage and waveform do not connect the probes to the forbidden areas show below Touching them may cause the ICP1 blowout and Q1 11 failure Pw OV 35 V line S Source D Drain G Gate Forbidde Forbidden area Gate G to 0 V n area OV The Q111 is aMOS FET and its gate terminal is a high impedance When a probe such as a multimeter is contacted with the gate the Q111 may have the continuous ON state to supply overcurrent in the circuit causing the ICP1 blowout and Q1 11 failure When checking the switching waveform of the Q111 set
57. the source S to the base and measure the gate and drain 4 During power feeding to the P W B do not remove and insert the CN10 fan motor connector Failure to do so may cause overcurrent to the fan motor and P W B s micro computer IC and the like and a failure may occur To remove or insert the CN10 be sure to shut off the power 66 THE SUPPORT FUNCTION OF FAILURE DIAGNOSIS Self diagnosis indication function e The timer lamp indicates a mode of failure detected lt Indicating a failure on the indoor on the indoor or outdoor unit side by blinking unit side gt frequency A failure detected on the outdoor unit side will be indicated by the timer lamp blinking 4 times after a retry operation has been performed several times Note In some failure modes only the retry operation is repeated without lamp indication lt Failure modes that will repeat a retry operation without the indoor unit lamp indication are as follows gt OH thermistor temperature rise Outdoor unit communication error Power voltage abnormal Less frequent defects Indicating a failure on the outdoor unit side gt The LD301 indicates a mode of failure detected on the outdoor unit side by blinking frequency Upon failure detection the outdoor unit will shut down and the LD301 continues to blink until the unit is reset In the event of communication errors the LD301 continues to blink until communication is restore
58. y R104 7 5k 21 R105 4 7K D901 12042 Al M 110 H 52 8106 10K 0902 12042 Al M 110 A 53 lecze R107 H M D903 12042 Al M 110 H 55 iss _ 0 8 _ 8 mm ram ZENER ZENER DIODE FFE EE 1 H4 H HH TERMINAL BOARD 4 CIC w T ve Hr ___ __ FEE ESE EEE 8 unis po TS 01055 LL reat o EE LLL T SEPTA 4 LL E DEI 4 eem wf C umasa wama wila a pd E Sie eh qas 4 cns w ec 0 vs jenem usos I T eum P G Ea Es s ISIS EX de seras Sa RE eee ie TEE 3 ACT ON OFF Jol ZH ekk e Dn I TL TT LI er f ve a ua lel a 5 EEPROM T LT T LT rete wes LI sua eds s va vi C A TN TH CT aes mi E rir Bg ee LLLI wel J ITT LIT Dum b one OO z ee ee et Bi EE HRE gt NAM T EUR LT T TT LI or I T i tur G e se vain sur Qe LT LT TITI esos os en ve A miu ep o LED lt lt 5 T LT T TT LI pe
59. yey aye s 99JJ pjouesnou 19M Duisneo pue JOOPU y sdoJp ujed eui u PUNO 1 Aue J esou urep y JO MOJ uloouus eunsue eseejd suoddns eui Buloeds e uyw peuoddns e qejns yi punose syed 526 JI pun 100pino 941 w lt seb ejqeuuuie j si 2194 uomeoo y esu jou oq s six YOOUS JO eui noullAA eu jo eus eui uo Buipuedep pej eisu eq 5 V NOLLNVO V syne sedid 1eddoo uexouq ul SIU 20 195 y esn eins eg 0045 ANITHISV4 I93NNO asneo Aew yea JO Jo uup y JO sedid sep 10 yes y eoejd 10 esn sp q JJesano Ag eui j e1su JO 11095 eDeyxee wun eui UBIDIUYOS 10 yse esee g Aq yun eu
60. 10 51 eui S SOA ewou Jojsiuueu y JO eui S BuloiA1 s Jaye 12euuoo ue qoJd ay JeuuJouqe S uul 7 SHUIIQ 10201 80 3y y uo A0 S ASI SI pejoeuuoosip sisoubeiq Jewog 5 88S x SPA eui eoe deu eAnpejep eq e npouu eu YNO PUE END 01095 JOLIOAU ewou lt ewou 1ndino y S AG 94 S SO Buipjeius 104 JOOPINO eui 2949 x JO 10J 8u 499u2 x SI e oAo y J 995 o 499u2 x JEWJOU y ui Sued OU S peeds SOU SHUI 10207 Sesu JojsiuJeul HO y eJnjeJeduJo eu 9 SHUG 81 Ajainoes pojoeuuoo 5 yeu suns oouo eui eui eui By
61. 12 PIPE SET OUT 13 UPPER COVER 14 SPRING 15 TERMINAL BOARD 2P 16 TERMINAL BOARD 2P 17 POWER SUPPLY CORD 18 THERMISTOR ASS Y 19 POWER SWICHI 20 P W B MAIN 21 25 4 22 1 P W B INDICATION 22 CONNECTING CORD 12PIN 23 ELECTRIC PARTS COVER 24 COVER TERMINAL 25 DRAIN PAN 26 HORIZONTAL AIR DEFLECTOR 27 DEFLECTOR SUPPORT 28 AUTO SWEEP MOTOR 29 DRAIN CAP 30 HEAT INSULATOR PIPE 31 DRAIN HOSE 32 FRONT COVER ASS Y 33 COVER EARTH 34 COVER SWICHI 35 FRONT PANEL 36 AIR FILTER R 37 AIR FILTER L 38 COVER LOWER R 39 MOUNTING PLATE 40 REMOCON SUPPORT 41 SCREW ASS Y 42 REMOTE CONTROL ASS Y 43 COVER ELECTRIC 5 90 MODEL RAC 18YH6 RAC 25YH6 OUTDOOR UNIT 91 OUTDOOR UNIT PARTS No NO RAC 18YH6 RAC 25YH6 Q TY PARTS NAME HWRAC E10H2 A01 1 IBASE COMPRESSOR 800W 8 0kg COMPRESSOR RUBBER PUSH NUT CONDENSER REVERSING VALVE WITH COIL SERVICE VALVE ASSEMBLY ELECTRIC EXPANSION VALVE SOUND PROOF COVER ASSEMBLY 10 O L R COVER 12 CONNECTING CORD COMPRESSOR 13 _______ 1 __ A08 1 THERMISTOR DEFROST 14 THERMISTOR SUPPORT 16 COIL ELECTRIC EXPANSION VALVE 17 PARTITION WITH HEAT INSULATOR 18 REARCTOR COVER 19 REACTOR1
62. 31715 joued 1014 91 yun y 1snp 1ue eJd SNOILVIIGNI LINN ULT LINN YOOUNI LuWd HOW 30 SNOILINAS ANY S3IAVN 1uVd HOW 30 SNOIL NN ANY S3IAVN e qejreA e 5 MOT pue q33dS NVJ sseJgd uo Buipuedep enjoe y pue 1 jasad 94 uoee 9 4 A pue ejnjeJeduue eui SS ld 2 92 JO Aq 5 se Dunes ay J8MO JO 95121 ueo noA uolnq dOLS 1HVLS eui sseJd Ajuo ui ui eu sy m AOLS N IHOVLIH uoneJedo dois y SS ld e sueis uoneJedo dOLS 1HVLS 99 58914 009 yeoy y 51 5 ou SI y su 1esaJud 0 2 8 s uomejedo Buuojuoul y 5 eui
63. 5 eq uone4edo y y uo YOUMS u uAA A ddns eui 40 YOUMS peuunsei si amod y UBYM uodo y JOU 1 e1oulaJ q peddois jou s y sv pue uomnejedo snoiA 1d 5 si y UBUM 5 amod SI 191 J 0000 Jo seinuiu noqe dois Aew ONIMS OLNW anje e ejeoipui JOU SBOP pue 991 98101d o SI SIU HO19313S ee urepe ul y 135 pue p109 Jamod y Bnjdun 10 uo pue yo uo1iMs y ss un JO 50 100 Sdojs 9200 dOLS 1HVIS J9 8M 1 1991010 4 d3S3u 1HVLS pue uo jou oq nje4eo eui ejpueH J8jeou OU sce UJ H seoe d y eui ind jou oq NN 9Sf 10J suonneoaJd aaaas C uongAJes9gJ SUI UO WING 139NVO uoneAJesaJ Dunies eui uonnq 3AH3S3H NO uun 94 pajos H3WLL NO 440 un y Pas H3NW
64. 5 045 C L201 0 2 110 C CN3 XA 8P Top 118 H R116 R403 5 1K 5 C R551 10K 5 1 108 041 C R765 390 59 1 18 027 C s C507 0 10 25V C 045 C er MT CEE PT NE D4031 188355 095 lc se lemme Se L501 10 O25 CN4 PH 5P Top 119 H R117 68K 5 1 16W 024 C R404 5 IK 5 C R552 1K x596 1 108 033 C R766 390 59 1 40W 026 C ann veda C521 0 10 25V C 045 C AX JR13 CN5 Pi 2P Top Un use H 118 75K 2 1 180 021 C R767 390 5 1 16N 027 EP nm EM cis C522 0 220 10V C 057 C EX LED TAP 6 PH 11P Top 120 H 2119 6 8k x 296 1 16W 022 C 5011 1M IT je gt C523 0 1 25 045 C Circuit s Model 2 men ieee L701 BM14501 0 2 110 C CN7 XH 4P Top BLK 121 H Tm C524 0 tn 25 C 045 Ic Symbol 5821 155355 095 c CETT 125 H 6121 0 56 5 1 4 008 C R503 10K C R602 10K x596 t 108 030 C R804 120K 596 1 8 039 C a S LD201 HLMF K305 H R122 100 X596 1 16W 042 C 2504 10K C 2805 120K 5 1 160 031 C UE TT mE HIS C601 0 14 25V C 045 C LD202 HLMF K405 Orange H 1751 16080 025 CN10 XA 6P Top 122 H R123 33K X596 1 16W 043 C R505 10K C R611 _ 1K 5 1 0 006 A R806 120K 596 1 16W 031 C TE 7 T Suet C611 1000P 50V C 047 0203
65. 801 1608 Circuit s Model 2 R514 10K R654 10 5 1 80 032 C R823 10K 1961 1008 017 C C802 0 154 50V F 063 R Sensor Unit Symbol R211 1 5 11 160 033 C R515 10K C R655 5 1 16W 030 C R824 8 25K x 196 1 40W 019 C C803 ERES Circuit s Model ZD111 RD6 2UJN2 101 R212 47 5 016 c 516 10K C frese 1K 5 W 033 C nRe25 10K 1 0017 C ar m T S C804 182731 Over Current Protecter R517 10K C R826 1 59 1 100 033 C mm aT TW C821 0 01 50 061 R Circuit sl Mode Rating 2 IRR RPM6938 V4 130 H 20121 220 098 301112 7K 196 1 18 018 C R518 10K C R701 1K X596 17160 033 C R827 3K 5 184 037 C 822 1000P 50V C 047 C Symbol Currents j Thermistor ZD131 RLZ6 099 C R302 12 7K 1 1 18W 018 C R519 10K C R721 3 3K 5 t 10 036 C R828 10K 1 1 40W 030 C C823 0 0470 25V C 056 C I CP 1 CCP2E 20 0 IMP WX NALE ZD141 RD5 6UJN2 100 R303 10K 5 1 16W 030 C R520 10K C 27312 7K 5 1 6 007 R829 5 1 5 1 10 040 C ea eae C824 0 010 50V C 055 C I CP2 CCP2E 50 2 0 utehl es R521 10K R732 10K x596 t 108 030 C R830 1 5 t 80N 006 A a c825 0 t1u 25V C 045 Roon Ta C402 Thermistor RREL4587 127 H
66. BDis eui 1 G euin y 196 r ejojduuoo MOU si BUI eu jo Buas eu 00 7 Je eq eunjejedujel Hl 10 195910 y os uo uni 94 T TU NA 4 ps e iun JOOPU uo sjufij 941 pue 5 d q y 51461 upis Q3AH3S3U Q ey pue jo peeisur BunuBii seis NO 94 uollnq 3 3534 sseud pue UN JOOPU BU B OWA BU jo MOPUIM euDis eui 1 04 uoing eut uym eun 105 a eje duioo MOU SI jjo uunj jo Buas 941 _ Udo L 1e UN eu LL 4 JOOpu 51461 dwel H3INILL pue 5 y sluBil Ug 4 3534 jo Bugy i suels 440 34L 3 3534 sseJd pue UN BU ejoulaJ BU euDis u 1 04 eut eun jo um 195 er MOU SI SUI jue4uno y Jo funes eu urdog SI w jua uino said Gules GEN 4 5 INIL sseud Buim s Li eui YOOYD OL ae 9 o Butusej jo
67. BLOCK DIAGRAM MODEL RAS 18YH6 RAC 18YH6 RAS 25YH6 RAC 25YH6 INDOOR UNIT OUTDOOR UNIT Power source 18 50Hz 220 230V POWER N HARMONICS acu POWER RELAY mECTIFIER lt gt IMPROVEMENT IPM CIRCUIT Inrush current Protection circuit DC compressor motor Rotor magnetic pole position detection circuit Wireless receive Ip Remote controller ae circuit Filt i Hoom temperature E ilter thermistor gt Indicating lamp en imer Is Heat exchanger Overheat thermistor thermistor Auto sweep motor for Air deflector Outdoor microcomputer AX 8V11 Relay drive circuit Defrost thermistor Outdoor temperature thermistor Electric expansion valve oM Indoor Outdoor Indoor Outdoor control circuit n gt lt O Buzzer circuit Temporary switch interface circuit Initial setting circuit TERM DC fan motor drive Reversing valve coil circuit Reset circuit M Indoor DC em Reset circuit clock DC35V ED BASIC MODE MODEL RAS 18YH6 RAS 25YH6 Fan Cooling Basic operation of start stop button Off gt On On gt Off timer Timer functions Changes from to Med or Lo depending on room temperature Temperature set
68. EwweLeHoId u q sey u uauM JO 51 ejdsip NOILVY3sdO YSAWIL d3a31S ONINNVYDO d yeubis e 10 SI y 1994100 y Ajuejod eui S peeu s n yeq eui suonipuoo y Aea jim Aoede spun eui MOT 24 ApuDi s samo Aupiqedeo sun eui MOT amp eut SLNIOd SNIMOT104 AHL 3423HO NOWIGNOD si Q JO sn p le u si WoO eui Jaye uoneJedo eui JO peeds Ue IH Z eui yum Buunp 334 JO OU YUM usej Aew 1 10 09 ay Buung SLNIOd 1O3HO 32IAH3S HOS 9NDISV N3HM Eee eee isse O JIM eui OS YIOM BU 49 si eui uollnq 2 eui ALNVHUVM 33835 S31VS H313V pefeidsip eq ay Ajuo pue spuooes 0 ul HO BU eui 9X905 y pue pue uoljesedo 5
69. HITACHI RAS 18YH6 RAC 18YH6 RAS 25YH6 RAC 25YH6 REFER TO THE FOUNDATION MANUAL SERVICE MANUAL TECHNICAL INFORMATION CONTENTS SP CIFICATIONS x 4 H TO u 5 CONSTRUCTION AND DIMENSIONAL DIAGRAM 15 MAIN PARTS COMPONENT 17 Wine pie z 19 RAS 18YH6 O pp Q 20 RAS 25YH6 BEGOK DIAGRAM u 22 23 REFRIGERATING CYCLE DIAGRAM 29 DESCRIPTION OF MAIN CIRCUIT OPERATION 30 SERVICE DAL Q 60 TROUBLE SHOOTING erm 63 PROCEDURE FOR DISASSEMBLY AND REASSEMBLY 87 PARTS DIST AND DIAGRAM 89 RAC 18YH6 RAC 25YH6 SPECIFICATIONS DC INVERTER WALL TYPE COOLING 8 530 3 070 10 580 TOTAL INPUT W A 2928 BEANS TOTAL AMPERES A 2 93 2 81 4 45 4 26 kW 2 50 0 90 3 20 3 40 0 90 4 40 capacity LK B T U h 8 530 3 070 10 920 11 600 3 070 15 010 700 68 700 68 DIMENSIONS 280 mm x X b m aew 266 48 NET WEIGHT kg x After installation SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOH IMPROVEMENT ROOM AIR CONDITIONER INDOOR UNIT OUTDOOR UNIT DECEMBER 2006 Hitachi Household Appliances Wuhu Co Ltd 10 11 SAFETY DURING REPAIR WORK In order to disassemble and repair the unit in question be sure to disconnect the power cord plug
70. IL 344O eui 195 o suollnq eseu esf uollnq 5NIAS OLNV 10129Jes q33dS NVA AjeoioAo Nv4 4 pue 1009 01 ASIGININHAG O 1L v3H OLAV Woy eui y sseJd eui 199Jes uollnq siy esf 10199 9S NOILONNSA punoj si uonejedo eulos u uA JO peoejdai seuenmeq 99 Jaye uojing siu sseJg 19534 ejep pue euin eui pue 195 0 uojng siy esf uonnq Ajyoinb enjeA eui pue eui J9M0 10 esieJ SUO ING 8599 esf 3un1vH3dWa l dee s y 195 0 514 esf 49315 apow 10 peeds ue 10 y smoje siu 01 2 IH amp o1 OLNV Q JO uopnq siy 55910 nok eum A1944 p ds eui siu 10199195 13345 NVA 1O 9 J p ejuozuou y Jo ejBue y 5NIMS OLNV uoneJ4edo dois sseJg uonejedo 11215 0 uollnq 51 ssaJg uonng dOLS LYVLS pejoejes Jo pue snes Ow
71. MIOA SI Jeuun eui UYM 51461 siu L im dINV 1 YAWNIL y 0 jun JOOPU eui peuipiunuep eui suweg _ EISE y n SOINUIW Q L G 104 Joopino 9504 inno aly 9HA8L OVH y JO jeeu y uo 501 u UA Jnoy ue peuuojed eq P LINN H00 01n0 Bunga 2 dn 1noqe 104 unng L j abed seseo iun y ejeJedo eui u NOIJVH3dO 94L em se og JOOPU eui uone4edo no pues uone4edo Buunp 51461 dwej siy L 19 O11u09 NOIL VH3dO Qenno 4 MAREA Sl pers 10199 Jop 40129 Jop y pesseJd si ONIMS O1 V Cu ay 5206 duie eu eui HOLIMS H3MOd eDed uonipuoo y Guiwous 44817 euin S Jey 5146 duue H3 114 sunoy 10 00 1 Jo 610 2 10 SI By
72. O Z W O O O O ES 4A O O ES O S 2 1 O O Z YES Y YES Y Z O O Z O YES IC YES IC ES NO WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE x D eouei dde y yum op Adu ey eansue eq 5 Ajayes eouei dde siy asn Adu yey eunsue e qisuodsai e Aq pasiAsedns Ajeyenbepe u q Ady ss un 10 ueJpjiuo Aq esn 10J p pu luli jou s siu nsa Aew suing pue edid eui uonoj JOU oq HONOL LNOG 196 yun JOOPINO eui JO pue eoeyns apno eui yono _ 012294 yoous dup ureip y Hojo 10 sued onsejd y 10 Ajeno e Buisn ueDe sajes uo jauuosjed pezuouine Aq eq snu yun Ajeroedse eoueidde siu eq woo asaid y 219 pue sjueuudinbe woo y do d y Ayjiqedeo 10
73. OOR FAN RPM IS NOT ROTATE AS INTENDED RPM MICROCOMPUTER CANNOT READ THE DATA IN EEPROM MI DURING OPERATION LD303 RED LIGHTS COMPRESSOR OPERATION OPERATION OVERLOAD ME NE 1 OVERLOAD 2 OVERLOAD 3 2 DURING STOP NOT MALFUNCTION THIS SHOWS AN OVERLOAD PROTECTION STATUS NOT MALFUNCTION L0303 RED GOES OFF NORMAL STOPPED BY THERMOSTAT Mom MBSEEONSTQON STOP OR CONTROLLER OMAIN P W B OMAIN P W B COMPRESSOR OMAIN P W B COMPRESSOR OMAIN P W B COMPRESSOR Q OUTDOOR UNIT I EXPOSED TO DIRECT SUNLIGHT OR ITS AIRFLOW BLOCKED OFAN MOTOR OMAIN P W B THE VOLTAGE 15 EXTREMELY LOW OLEAK OF REFRIGERANT OCOMPRESSOR COH THERMISTOR CIRCUIT MAIN P W B OTHERMISTOR CONNECTION OF THERMISTOR DEFECTIVE OTHERMISTOR CIRCUIT COLEAK OF REFRIGERANT COMPRESSOR OCABLE 15 WRONG CONNECTED CABLE IS OPEN INTERFACE CIRCUIT OF BETWEEN INDOOR UNIT AND OUTDOOR UNIT ABNORMAL POWER SOURCE CABLE 15 WRONG CONNECTED MAIN P W B OFAN MOTOR FAN MOTOR CIRCUIT OMAIN P W B ese FOR 0 25 SEC AT INTERVAL OF 0 25 SEC OUTDOOR UNIT Remove the compressor connector MAIN P W B Nu a a T mie E QD Yo x TT iji He er p l i 052 55555555554 SERVICE SWITCH If your first attempt e Check the drive state press the start stop for the unit to re the PRD checker rails wan skin as With the uni
74. On timer during operation during stop 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 ultra Lo mode other than during preheating cooling is recovered at 18 33 C When the compressor is running at maximum speed In modes other than during hot dash or when recovered from defrosting left Heat exchanger Hi or ultra HI temperature fan speed set to auto Set to ultra Lo Lo Med Hi ultra Hi or stop depending on the room temperature and time Set to stop if the room temperature is 18 C in the ultra Lo mode other than during preheating cooling is recovered at 18 33 C Set to ultra Hi when the compressor is running at maximum speed during hot dash or when recovered from defrosting Set to ultra Lo Lo Med or stop depending on the room temperature and time Set to stop if the room temperature is 18 C in the ultra Lo mode other than during preseating cooling is recovered at 18 33 C Set to Lo in modes other than when the compressor stops Set to ultra Lo Lo or stop depending on the room temperature and time Set to stop if 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 by the heat exchanger temperatur
75. Peak current cutoff circuit Fig 6 3 shows the peak current cutoff circuit and waveforms at each section DC current Id 2 25A f Voltage at point 0 6V Voltage at point Outdoor microcomputer e lp cut circuit detects instantaneous large current and operates to protect various parts such as IPM by stopping inverter e When current exceeding 25A flows as shown in the diagram voltage at point A detected by detection resistor is divided by R906 and R905 and then input to IPM pin 26 Since this exceeds threshold value IMP pin is set to Lo voltage at point B When Lo signal is input to pin 15 of microcomputer microcomputer will stop drive output and self diagnosis lamp will enter a 2 time blinking mode When peak current is detected IPM holds lower arm output off status for a fixed period approx 4 msec and then enters drive signal standby mode Microcomputer outputs drive signal 3 minutes later to restart operation 50 6 2 Overload control circuit OVL control circuit Overload control is to decrease the speed of the compressor and reduce the load when the load on the air conditioner increases to an overload state in order to protect the compressor electronic components and power breaker Overloads are judged by comparing the DC current level and set value Fig 6 4 shows the overload control system configuration and Fig 6 7 is a characteristic diagram on overload judgement values There are two ty
76. Pin 60 1 9 5 0V e C A A A APA 5 OV 100ms 33ms Leader 1 frame Fig 2 2 Voltages Waveforms of Indoor Outdoor Microcomputers Outdoor to Indoor Communications Outdoor microcomputer Pin n oOo vV MOULIN AS 0V Indoor microcomputer Pin 0 ay j 5V OV E ee Ge NAME OV 4 95ms 33ms Transmit receive 1 frame switching time Fig 2 3 Voltages Waveforms of Indoor Outdoor Microcomputers Indoor to Outdoor Communications 39 v c 13 KENNEN 9 NE AQ S s pue 0 P S y ueuM SUJJOJOAEM SUONedUNWWOD 0 ON 19 suig6 y swig euin DuiuojiMs 19591 u uAA 9AI929J fAlUuSUeJ Joopu OIH Joopjno jejnduuoooJoru JOOPU Z 0 Z 0 ON 4 SWOOL SWOOL 5 00 Jopee 0 Jopee 19591 ueuM ON J9joeJeu2 SUGE L LE SUIG6 QX SWE EE 8 00 OIH 100pino L Buunp 4 suoneoiunuiuo jenes 40 Serial Communications Data 1 Outdoor message Fast feed 1 10000 for commercial test Fast fe
77. U EL SMOJQ peijddns si je od y ueuM 99 10 uos jo Buruan Aq pares s 94 BuuiM pue PU ae iM y ui peuinsuoo puDi s si amod JOU si yun eui pue uo s ejs y J uomejedo BuiAjipiuunuep 10 pue peuuojied Joopul Y Jejew eui SUIG 81 uonejedo Buneeu ueuM 9504 inno QHASE OVY poled e 10 10 si eui eui opis Sm Jo JeuiuJa yey Mod ino 10 eui UINL peuoiiws SI amod eouo uorejedo jeyeipeuuuu IM 1ueoe JSOW SIUL J JOU S Op 1 ejoujeJ eui dois pue PEIS YMS siu e E HOLIMS AHVHOdIN3 L s pis pue 1 pue Buidid ae peuuojied SI Bui IIpiuunu p 10 Buijooo Buunp GuyAypunyap 10 uaum BUI
78. aring covers 4 Remove the locking hook of the lower bearingcover from the i Cabinet 9 bearing cover 7 Remove P lock which binds lead wires Le d 8 Set the electrical box upside down 2 Z Lower bearing cover Cabinet Fig 6 5 Remove two lock screws from the fan motorholder 6 Pull up the evaporator by holding it at the lowerside Insert a screwdriver through the spacebetween the evaporator and drain Fig 10 chute andloosen the fan lock screw to remove the fanand fan motor 9 Remove P W B fixing screws 2 locations and radiation fin fixing screws 5 locations and remove the P W B from the support Radiation fin fixing screw lt OUTDOOR UNIT gt MODEL RAC 18YH6 RAC 25YH6 1 Electrical Parts 1 Remove the upper cover fixing screws and lift the cover to remove it 2 Remove the service valve cover 3 Remove the terminal plate cover 4 Remove the right side cover P W B fixing screw Fig 11 88 PARTS LIST AND DIAGRAM gt EO VD lt gt MODEL RAS 18YH6 RAS 25YH6 INDOOR UNIT 89 INDOOR UNIT PARTS NO NO RAS 18YH6 RAS 25YH6 PARTS NAME HWRAS 25YH5 A20 1 ICABINET VERTICAL AIR DEFLECTOR L VERTICAL AIR DEFLECTOR R FAN MOTOR 25W 1 1kg TANGENTIAL AIR FLOW FAN FAN SUPPORT ASS Y FAN COVER FAN MOTOR SUPPORT EVAPORATOR ASS Y 11 PIPE SET IN
79. ature arrives at the preset indoor temperature and the air conditioner unit is temporarily stopped Within about 3 minutes the fan starts rotation 2 When the unit operates at LOW air speed it continues to operate at the same speed When automatic operation is performed the preset temperature won t be indicated However you can adjust the temperature within a range of 8 C by pressing the Room Temperature button If the temperature is 1 C higher than the auto preset temperature 4 1 C will appear If the temperature is 1 C lower than the auto preset temperature v 1 C will appear The heat exchanger temperature 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 fo
80. color has been changed conspicuously replace the compressor 18 WIRING DIAGRAM A CAUTION COMPRESSOR BLU BLUE ORN ORANGE MODEL RAS 18YH6 RAC 18YH6 RAS 25YH6 RAC 25YH6 BLK BLACK RED RED BRN BROWN WHT WHITE GRN GREEN YEL YELLOW GRY GRAY The marked parts very important ones for safety OUTDOOR UNIT OUTDOOR 0 LY FAN MOTOR A FUSE gt INDOOR UNIT a DIODE STACK SINGLE PHASE AC220 230V 50H 7 POWER A TERMINAL CONNECTING i 082 T E i THERMISTOR SWITCH CORD n ys Rez As n mm REVERSING VALVE 4 x oTo x 3 oA __ BLK BROWN s BLACK o BLACK BLUE 2 11 WHITE _ B WHITE _ _ oo 5 LINE GREEN amp YELLOW THERMAL DEFROST THERMISTOR ds EUSE 102 C GREEN amp YELLOW or recs ER C BROWN BROWN O am gay OUTDOOR TEMP GRY THERMISTOR CN8 CN3 x MAIN P W B RI IP RELAY x eicauger GRAY CONTROL THERMISTOR GRAY D WB CNA M AUTO SHEEP WHITE MOTOR x x x x x ROOM TEMP CN10 THERMISTOR lt HA b 0013 INDIGATING AN Ne CN6 CN7 008 EXPANSION VALVE owe CN2 12845678990 1234 C1C2M1M2 WIRELESS REMOTE CONTROL FAN MOTOR SWITCHING 22 POWER 2 SUPPLY 641
81. d 67 TROUBLESHOOTING WHEN TIMER LAMP BLINKS Model RAS 18YH6 RAS 25YH6 Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink SELF DIAGNOSIS LIGHTING MODE Model RAS 18YH6 RAS 25YH6 Blinking of Timer lamp Reason for indication Reversing valve defective 1 When the indoor heat exchanger 2 temperature is too low in the heating mode or it is too high in the Reversing valve defective Heat exchanger thermistor disconnected 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 is under forced Electrical parts in the outdoor unit operation When the outdoor unit is in forced operation or balancing operation after forced operation Indoor outdoor interface defective 1 Indoor interface circuit 3 times When the interface signal from the 2 Outdoor interface circuit outdoor unit is interrupted Outdoor unit electrical components Outdoor unit electrical components defetive For details operate again using When the same error mode is detected remote comtroller and check from 8 times within 30 minutes from outdoor self diagnosis display of outdoor 4 times unit electrical components unit However when error is detected 8 times within two hours only for outdoor thermistor Room thermistor or heat exchanger Room thermistor therm
82. e the overload control is executed as in the following diagram Heat exchanger temperature Med with overload Lo See page 26 See page 27 Same as at left See page 28 Same as at left See page 26 Judging operating mode change during operation Continuous judgment Operating mode is judged by room temperature and outdoor temperature 1 Judging by outdoor temperature Operating mode is judged by outdoor temperature Only when the mode is not resticted by this judgment the judgment by room temperature in the next paragraph will be performed a Outdoor temperature 2 27 Restricted to cooling b Outdoor temperature lt 16 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 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 e Room temperature 25 C 3 C Cooling e Room temperature lt 25 C 3 C Heating 3 C is the fine adjustment value from the remote controller c Cooling Heating 16 C 27 Outdoor temperature a Conditions for judgment any of the followings The mode is reviewed at every interval time When auto operation is started a
83. ed 1 1000 for commercial test Rotary reversing valve being ON Outdoor new communication bit Fan 7 step request Actual compressor rotation speed 7 MSB Actual compressor rotation speed 6 f 710 112133415 67 Actual compressor rotation speed 5 Actual compressor rotation speed 5 6 7 0 12 3 4 5 6 Actual compressor rotation speed 3 Actual compressor rotation speed 1 0 1 0 1 0 1 0 4 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 4 0 0 1 1 0 O 1 0 1 0 1 Actual compressor rotation speed 1 Outside tempere During forced operation 2 3 ___ 5 sr 1 0712 34 5670 12134 Character No 4 Bit No Contents Data fo fo 2 Indoor message 41 Compressor minimum ramon speedy io Compressor minimum ran speed Compressor minimum ramon sped 7 cwm 5 4 1 Compressor command speed Compressor commana speed 158 _ 1 0 4 0 1 0 1 0 1 0 1 0 1 0 1 0 4 0 1 0 1 0 1 0 1 0 11 0 1 0 1 0 Main power ON request Quick heating a eri _ cos Capacty _ Capacity code Ls Indoor imoperation bt LO LO Operation mode 2 MSB Operation mode 1 1 Operation mode O LSB 1 0 11 0 1 01 00 0 o o 1 0 1 0 1 0 o 1 0 0 0
84. es if indoor temperature is higher than 18 C No time limit constrain if outdoor temperature is lower than 4 C During Hotkeep or Defrost mode indoor operation lamp will blink at interval of 0 5 seconds ON and 0 5 second OFF When heating mode starts it will enter into Hotkeep mode if indoor heat exchanger temperature is lower than YNEOF 0 33 When fan is set to Lo compressor rpm will be limited to WBEMAX When fan is set to Med compressor rpm will be limited to WJKMAX In Ultra Lo fan mode if indoor temperature is lower than 18 C indoor fan will stop If indoor temperature is higher than 18 C 0 33 C fan will continue in Ultra Lo mode During Hotkeep or Defrost mode fan will continue in Ultra Lo mode 10 During Hot Dashed when room temperature reaches set temperature SFTDSW compressor rpm is actual rom x DWNRATEW 2 3 4 5 Se 27 Heating Sleep Operation Reversing Valve Defrosting Over defrosting inhibit period Fan spee ed Start Stop button a Hi pu Z 2222222222 Preheating judgment wm 22 7 777 J mm zm M De mmm e AAAA i 2222 OO OOOO R GRA on mc m i e Sleep button Remote control Sleep Deceleratio period tory m mino Him Bo j UT Notes 1 The defrosting inhibit period is set as shown in the diagram be
85. et value the microcomputer decreases the rotation speed of the compressor and reduces the load Judgment value according to rotation speed internal judgment value DC current Rotation speed Fig 6 7 _ 52 H003 R004 R608 R6183 detect the DC voltage at the power circuit The microcomputer receives DC voltage and applies correction to the overload set value so the DC current will be low when the DC voltage is high Since the load level is indicated by the DC voltage multiplied by DC current R247 R248 R249 are provided to perform the same overload judgement even when the voltage varies DC voltage Low DC current High DC voltage 260V DC voltage High DC current Low DC current 0 Rotation speed Fig 6 8 3 Start current control It is required to maintain the start current DC current constant to smooth the start of the DC motor of the compressor RAC 18YH6 RAC 25YH6 uses software to control the start current The start current varies when the supply voltage varies This control method copes with variations in the voltages as follows 1 Turns on the power module s U and V transistors so the current flows to the motor windings as shown in Fig 6 9 2 Varies the turn ON time of the U transistor according to the DC voltage level and the start is controlled so the start current is approx 10A IPM Compressor motor DC Voltage N resistor Fig 6 9
86. f no error is found in this step the power circuit is normal Check the removed loads If any error is found in this step the power circuit has any failure Replace the MAIN P W B A short circuited load may cause an output error not only in the load but also in the others Be sure to check all outputs of the loads Be sure to wait 15 minutes or more in order to discharge all the remaining voltage in the circuit to connect disconnect the wiring other wise the components may be damaged e he failures of the loads are as follows Failed Possible causes Criterion output 35V Reversed connection of the cable Connect the cable correctly Electrical part for the indoor unit has Hemove the connection cable and measure the a failure voltage If the voltage is correct check the electrical parts for the indoor unit Short circuited reversing valve Hemove the CN2 and measure the voltage If the voltage is correct check the reversing valve DC fan motor error Hemove the CN24 and measure the voltage If the voltage is correct check the DC fan motor Also check the main P W B 1A fuse for blow out in this step 12V 5V Main P W B error Check the main P W B 48 6 Peripheral circuits of microcomputer Fig 6 1 shows the microcomputer and its peripheral circuits Table 6 1 shows the basic operation of each circuit block and Fig 6 2 shows the system configuration IPM Intelligent Power Module DC voltage
87. for cooling Thermo judgement Compressor Hi Compressor stopped forcibly for 3 minutes Runs at until first thermo off after operation is started Runs at Lo when thermo is off Set to ultra Hi when the compressor runs at maximum speed and to Hi in other modes Same as at left Same as at left See page 25 Same as at left e See page 26 Operates at Hi regardless of the room temperature Fan speed mode indoor fan Operates at Med regardless of the room temperature Operates at Lo regardless of the room temperature Basic operation of temperature controller Performs only fan operation at the set speed regardless of the room temperature start stop button Operation lamp Enters sleep operation after set as on the left Action during sleep operation Lo sleep operation Sleep operation with sleep button ON Dehumidifying dehumidifying operation by the function select button only not including Heating auto that engaged by the dehumidify button Start Stop Start Stop Start stop button Operation lam Start stop Reserve button Cancel button Operation lamp Timer lamp Timer memory Off timer during stop Change in reserved time Srart stop Reserve button Cancel button Operation lamp Timer lamp Change in reserved time On timer during operation Off gt On timer On gt Off timer On gt Off timer Off gt
88. function starts operation earlier so the preset temperature is reached at the preset time Operation may start maximum 60 minutes before the preset time It does not work It works only during cooling 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 Has the clock been set Timer cannot be set unless the clock has been set When the current time is set the display flashes for approx 3 minutes Is the current time past the preset time When the preset time reaches the current time it disappears When the Sleep timer is set during operation 1 The indoor fan won t rotate No air comes from the unit 2 The air speed won t change The preset temperature is not indicated on the remote control OTHERS 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 1 The temper
89. g 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 In the fan Auto mode the unit detects the heat exchange temperature When the temperature becomes low the fan speed changes from HIGH through MED to LOW This is not an error The anti cool air function shows this phenomenon 60 AUTO FRESH DEFROSTING After the ON OFF button is pressed to stop heating the outdoor unit is still working with the OPERATION lamp lighting Fan speed does not change when fan speed selector is changed during auto operation When on timer has been programmed operation starts before the preset time has been reached Does Nice temperature reservation function operate during dehumidifying Even if the same time is preset the operation start time varies Timer cannot be set The current time display disappears soon The timer has been programmed but the preset time disappears The current time disappears in approx 10 seconds The time set display has priority 61 Auto Fresh Defrosting is carried out the system checks the outdoor heat exchanger and defrosts it as necessary before stopping operation At this point fan speed is automatic This is because Nice temperature reservation function is operating This
90. gain 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 temperature S Final preset temperature Room temperature gt Final preset temperature Currently heating Room temperature Final preset temperature Room temperature lt Final preset temperature 0 2 C Change to heating 2 C Continue cooling 3 C Change to cooling 3 C Continue heating Cooling Heating final preset temperature Same as at left Performs the sleep operation of each operation mode 53 24 Table 1 Mode data file Lo RAS 18YH6 RAS 25YH6 2700 min Table 1 Thermo judgment Thermo judgment O Basic Cooling Operation ATCMAX CLMXTP Room temperature Thermo judgment oom temperature Outdoor Thermo judgment O temperature Thermo judgment Er ee Table 2 Compressor rpm Calculated compressor TPM with shift value Start stop button Start Wiwa 2200 Thermo judgment S __ Ee j j j H SEN Indoor fan Ep 0
91. ide Board In _ _ _ Capacitor _ Transistor Diode I C Coil TIR i o T 11 gt o NE Ll ju o Tu as m T T it i i a ni a r ae icin E Powe 2 E ee Power fiain 5 B Power itat i 2 Numa nias Circuit s Numerical E Draving Gs Mode minda Circuit s Model s TTE Model Draving s Z Model o LI mol Value SW tse mhol Value S 5 Symbol Value nih Symbol Value 5 Wi Value B Symbol Value niih Symbol part s No zs arts bl 2 Syntol ats tle Circuit sNumerical Rating Drawing s 2 Circuits Model ants Ri11 27 59 R305 1 5 C R 22 10 5 11 1601 030 C 875112 7K 59 2 Symbol ts Woes t s Nol 2 112 30K 5 R306 1K 5 C C502 0 14 25V C 045 C Q802 RN2102 080 C D D L101 82u 1 H CN1 PH 2P Top 116 1 145 C R62 10K 5 iml 009 TA C102 R 9112 28C5209H 074 C CI EOM boo E oe 111 D1FS6 092 IC121 LF50CDT 083 Jaz moms R114 750x596 1 8W 010 C 401 390 5 10 5 1 009 A C505 0 1 25 C 045 C 0821 28C4738GR 073 22 8539 111 560 0 6 113 CN2 1D Sii mr vs Fs E C104 0 tu 25V C 045 Jc 0114 RN1102 078 C 401 HN1D03FU 093 C401 24C04BFJ 084 C i R115 560 5 1 BI 011 C R402 390 5 C qi toe l C506 0 1 2
92. in Figs 3 1 and 3 4 First half of upper arm is chopper second half is ON and first half of lower arm is chopper second half is ON UT transistor chopped U transistor ON Voltage at 280V 300V lt Chopping period x Chopping period 208 sec ON Upper arm transistor Current at Fig 3 3 Voltage waveform at each point When power is supplied Ut V because of that Ut is chopped current flows as shown below 1 When UT transistor is ON U transistor gt U coil V coil V transistor DC current detection resistor Point B Fig 3 3 2 When Ut transistor is OFF by inductance of motor coil U coil V coil V transistor U diode gt Point Fig 3 4 43 O x COMPRESSOR y x MOTOR He x aK HK VOLTAGE 55 x lt lt lt T o tod 6 x E 9 5 C100 C110 x U W CN1 TS AES AKA PK6P C RESISTOR f T Fig 3 4 Power module circuit U is OFF V is ON Since current flows at point only when U transistor and V transistor are ON the current waveform at point B becomes intermittent waveform as shown in Fig 3 3 Since current at point B is ap
93. istor is fault Heat exchanger thermistor When room thermistor or heat exchanger thermistor is opened circuit or short circuit Over current detection at the DC fan Indoor fan locked motor Indoor fan motor HEL 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 IC401 IC402 abnormal HL 13 times when data read from 1C401 or IC402 is incorrect Lights for 0 35 sec at interval of 0 35 sec lt Cautions gt If the interface circuit is faulty when power is supplied the self diagnosis display will not be displayed N If the indoor unit does not operate at all check if the connecting cable is connected to the outdoor unit 3 To check operation again when the timer lamp is blinking you can use the remote control for operation except for mode mark X1 68 SELF DIAGNOSIS LIGHTING MODE MODEL RAC 18YH6 RAC 25YH6 SELF DIAGNOSTS LIGHTING MODE A BLINK OOH N DANGER DC350V THE POWER SOURCE AND WAIT MORE THAN 10 MINUTES BEFORE SERVICE WORK DO NOT TOUCH THE OTHER COMPONENTS WHEN OPERATING THE SERVICE SWITCH SERVICE OPERATION RESET PROCEDURE OF REFRIGERANT PUMP STOP DOWN OR INDEPENDENT OPERATION OF OUTDOOR UNIT 1 CUT OFF THE POWER SOURCE ONCE THEN ON AGAIN
94. jou oq NOILNVS Y esoJo pue u uwous se 31y ye jeued ay usnd 5191 eui ejeis y 1015 Bupe eui 18S INO 1nd A jnuBi s s ou y eui pue y 1iesur 5 pue yun y 4945 y episui eui uue JUHU eui usnd spueu sue 1 6 pue eui JO seus eui AO N peuedo si jeued y ueuA epeus eui Ap 4 Aubno40ui 1 esuu pue USEM snp YONW OO SI 81991 JI Husn 141 u SNP 1u0J4 eui uoejop spuey uloq Jeued eui ains eg leued y eui pue jnjoJeo jeued eui uedo sesneo Joopul JO JO SJOjeoipul je sureuJa8J J9 eM dYNds00 d AjUBnosou eunpeooJd eui eui ULAJ eg novo esiou YUN panpa Kup os e Ajoedeo Buiooo eui pue
95. low 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 2 If the difference between the room and outdoor temperature is large when defrosting is finished the maximum compressor speed WMAX or WMAX2 can be continued for 120 minutes maximum 3 The defrosting period is 12 minutes maximum 4 When operation is stopped during defrosting it is switched to auto refresh defrosting 5 Auto refresh defrosting cannot be engaged within 15 minutes after operation is started or defrosting is finished Upper limit WBEMAX 1 The sleep operation starts when the sleep button is pressed When the sleep button is set the maximum compressor speed is limited to WBEMAX and the indoor fan is set to sleep Lo The indoor fan speed does not change even when the fan speed mode is changed Sleep Lo When defrosting is to be set during sleep oepration defrosting is engaged and sleep operation is restored after defrosting Notes Setting Defrosting Inhibit Period DFTIM2 DFTIM1 5 C 0C Outdoor temperature Notes 1 The time is set according to the outdoor temperature when it is between 0 C and 5 C 2 DFTIM1 is used when the outdoor temperature 2 O C 3 DFTIM2 is used when the outdoor temperature 5 5 C 28 REFRIGERATING CYCLE DIAGRAM MODEL RAS 18YH6 RAC 18YH6 RAS
96. m a final check of operation HOW TO OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNIT MODEL RAC 18YH6 RAC 25YH6 1 Turn off the power switch 2 Remove the electrical box cover 3 Turn on the power switch 4 After waiting for 30 seconds push the service switch for a second LD303 red will light and the unit will operate in the forced cooling mode at this time Never operate the unit for more than 5 minutes LD301 LD302 D303 Service switch LD303 LD302 MAIN P W B LD301 sue TR __ 019 9 p Wees o el x re PY a IPM HIC SERVICE SWITCH Cautions 1 If interface signal DC 35V terminals C and D are not connected when the outdoor unit is in forced cool mode the outdoor unit defect indicator LD301 will blink 9 times during operation to indicate communication error 2 If checking is done with the compressor connector disconnected the unit will stop and LD301 will blink 4 times Be sure to push the service switch for a second again to stop the forced cool operation HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY 1 Connect the large dia pipe side and small dia pipe side service valve using a pipe Outdoor unit 1 Reducing union 2 8 6 35 mm Large dia service valve 3 8 9 52 mm 2 Copper pipe 2 8 and 3 8 Connect the small diameter service value and the large diameter service valve using the reducing union and copper pipe as shown
97. n in the middle of Fig 1 4 After that the voltage is smoothed by the C021 and C022 and becomes the waveform shown in the bottom of Fig 1 4 DB1 and C41 The DB1 rectifies the input voltage and the C41 smoothes it for the control power supply If the units above have any failure the control power supply won t operate In such a case replace the main Smoothed Voltage OV C001 to C011 L101 and L102 They absorb electrical noise generated during Fig 1 4 operation of compressor and also absorb external noise entering from power line to protect electronic parts Be sure to connect the earth cable between the indoor unit and the outdoor unit Otherwise the noise filter circuit won t operate properly SA1 and VS1 to VS3 These surge absorber and varistors absorb external power surge such as induced thunder Be sure to connect the earth cable between the indoor unit and the outdoor unit Otherwise the surge absorber and the varistors won t operate R002 and R007 The resistor R002 protects the rush current when the power is turned on while the resistor ROO7 protects the rush current when the compressor starts When the R002 has any failure the control power supply won t operate When the ROO7 has any failure and a strong rush current is generated the DB2 C021 or C022 may be damaged 36 2 Indoor Outdoor Interface Circuit The interface circuit superimposes an interface
98. oltage 1 19 1 69 Reference When the thermistor is open in open status or is disconnected microcomputer pins 69 63 64 are approx OV when the thermistor is shorted they are approx 5 V and LD301 blinks seven times However an error is detected only when the OH thermistor is shorted in such a case the blinking mode is entered 12 minutes after the compressor starts operation 55 6 5 Reversing valve control circuit e In this unit reversing valve control circuit turns ON OFF the power to the reversing valve coil by opening closing the reversing valve relay e Opening closing of relay will differ depending on the operation condition In the cooling cycle reversing valve relay is normally ON close e Table 6 3 shows the circuit operation of each operation mode If the following result is not obtained reversing valve control circuit may be defective Table 6 3 Point Between Pin 29 Between Pin 82 of HIC Er Between 1 and 3 CN2 paralon mode non and OV and 2 2 In normal cooling operation approx 35V approx 35V V In normal heating operation ff OV not fixed Heati 9 Im defrosting operato approx 35 V Reversing Main P W B M Reversing valve relay RL5 D 0V 2 _ _ E E E HIC Reversing valve relay coil RL5 Microcomputer 56 6 6 Electric expansion valve control circuit
99. on of 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 relative 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 boards or the like on which the parts mentioned in 1 and 2 of this paragraph are equipped ltems 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 gt Conductive sponge ram x Fig 1 Conductive Container 2 When any partis handled uncovered in counting packing and the like the handling person must always use himself as a body earth Make yourself a body earth by passing one M ohm earth resistance through a ring or bracelet 3 Be careful not to touch the parts with your clothing when you hold a part even if a body earth is being taken 4 Be sure to place a part on a metal plate with grounding 5 Be carelul not to fail to turn off power when you repair the printed circuit board At the same time tr
100. on the right Reducing union 1 2 8 3 8 a Copper pipe 2 8 Charge refrigerant of 300g oN Do for than 5 Small diameter service valve minutes The operation method is the same as How to operate using the connector to servicing the outdoor unit x1 The charging amount of 200g is equivalent to the load in normal operation 84 IPM Intelligent Power Module DIAGNOSIS Collector Circuit of 1 device Internal circuit diagram of module Terminal symbols of power module See next page for measuring value using multimeter Fail signal 85 Diagnosis procedure for power module using multimeter Inverter section Set the multimeter to resistance range of X 100 If X 100 is not provided measure with the range of x 1 to X 100 If the pointer does not swing when the following continuity check is performed it is normal When a digital multimeter is used and terminals will be reversed since the orientation of built in battery is inverted Note If internal circuit of power module is disconnected open and pointer of the mutimeter does not swing it may be assumed to be normal If the pointer swings when and terminals are connected reverse it is normal Compare swing statuses for U V and W phases If the statuses at all 3 points are the same it is normal 86 Procedure for Disassembly and Reas
101. ors perform initial operation when the power supply is Check the wireless light receiving unit Is the control voltage being turned on after off N No Is the microcomputer reset input Check the reset circuit and repair pin Hi any defective section Yes No Is the microcomputer clock signal Replace the microcomputer and 10MHz at pins 10 and 4 being oscillator generated normally J LYes Replace the control PW B Perform final operation check X1 When not in operation the unit will enter into a low power standby state possibly causing a voltage drop to the 12V and 35V lines as shown below 25 20V 12V 7 70 2 Indoor fan does not operate others are normal Yes Yes Can the fan be stopped by remote The microcomputer fan PWM control output at pin 4 is 1 5V No No Replace the microcomputer Replace the fan motor Replace the microcomputer Perform final operation check 3 Air deflector does not move others are normal No Are microcomputer pins 5 8 when auto swing is turned on in the fan mode Replace the microcomputer Yes Yes Is a voltage over 15 or below 10V being generated on the 12V line Replace IC111 Check IC711 If it is normal replace the air deflector motor Perform final operation check 732 4 Check the control P W B power circuit Is 35V or 20V being output
102. otor aS JW101 pos 0131 39 ed SET O te ds 0121 C133 i a T Note amp IC121 ex LO on ae ae aem T _ ms 1 Type of Capacitor BRN gt e Fen Film Capacitor e GNG x l je ce m Qus Ceramic Capacitor RED O fo x D X ves Electrolytic Capacitor e e e 12V 2 Symbol of the parts list is ower Switch CDr e e as follow s CN3 5V L CN4 PH 5P Top eri Symbol Shape BRN 2 Axial Earth gt 2 0821 R830 3 R Radial _ Screw i D821 R827 WW 4 Manual S C821 R821 tm o od C Chi i 5 5V 5 Auto sweep motor o ES 10801 TO d E 82 oi BZ1 9 e o 5V Se Buzzer OTO R522 L 8 see 15 V N E 19 OV Vv 2 54 63 62 61 50 S3 58 51 54 58 54 53 54 51 50 14 OV R654 CN12 zl E 2 E s 35V CN f Fed 1 15 2 E E 2 8 z 2 655 1 Totg smells les mE S C601 i gt f UST FE zi E 1407 7048 AUTO R731 a 3 Heat exchanger gt a Jel fet Elle ee 5 E moema wa rl S 5 Thermistor NE d AV 18018 Le e OUTSIDE TXD nig We R307 4 2 OUTSIDE RAD PH 2P Top 1 1 Rost Mir CNIS
103. otor runs 2 minutes Fan Motor may be broken Caution gt Please take care for the electrical shock by high voltage of DC Fan Motor power source which is common with compressor when you are servicing this unit You can not confirm the coil and wiring of Motor directly due to the built in control circuit in Fan Motor 59 SERVICE CALL amp A Model RAS 18YH6 RAC 18YH6 RAS 25YH6 RAC 25YH6 COOLING MODE The compressor has stopped suddenly during cooling operation Fan speed is not switched over during dehumidifying operation Cool air comes from the unit during dehumidifying operation 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 When Auto fan mode is set the indoor fan speed changes from HIGH through MED to LOW Check if the indoor heat If the air conditioner operates exchanger is frosted in cooling mode when it is Wait for 3 4 minutes cold the evaporator may get until it is defrosted frosted Fans speed is normally set to LOW during dehumidifying operation To have an operation with high dehumidifying effect the unit operates at low fan speed As a result cool air comes from the unit This phenomenon is not a fault It occurs during defrost ing Wait for 5 10 minutes until the condenser is defrosted At the beginning of heatin
104. perature T NA N 7 NS LL OFF ilti Fan lw Set to auto Stop Start Stop Start stop button ta Thermo i relied Preheating judgment TWMAX es 7 oro n 2 M udi _ Preheat released mmm _ ES Indoor fan n sit 15sec 15sec JR 1 ort by Bii pe we DEBES heat exchanger temperature 2222 D m er sa heat exchanger temperature 10sec Pe heat Stanger temperature es TET Ultra e 1 min WMAX2 Max WM aE L lim Outdoor fan WSTD Wtd 3000 AX Rating E Compressor speed WMIN Notes 1 Condition for entering into Hot Dashed mode When fan set to Hi or Auto mode and i Indoor temperature is lower than 18 C and ii outdoor temperature is lower than 10 C and iii Temperature difference between indoor temperature and set temperature has a corresponding compressor rpm calculated value in Table 3 larger than WMAX Hot Dashed will release when i Room temperature has achieved the set temperature SFTDSW ii Thermo off During Hot 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 heating mode compressor maximum rom WMAX will maintain for 120 minut
105. pes of control which has named IS OVL and ID OVL IS OVL is limiting the whole input of this room air conditioner system through the current sensor CT 1 in order to keep the maximum rating of components by reading total operating current ID OVL is watching and limits the compressor current through the detection resistor which is built in IPM in order to control the compressor reliability Since the compressor reliability is related with its speed the ID OVL value is also linked with the compressor speed Fig 6 7 shows an ID OVL limitation curve All of OVL operation values were programmed into EEPROM memory Compressor Microcomputer EEPROM Motor current ID Y A D Detection converter resistor Y Motor Amplifier control process converter Detection transformer CT 1 Whole current IS Fig 6 4 Overload Control System 51 DC 235 V ia eo R003 Detection resistor 26 Q4 R004 ROOI N DC current j G9 OV OV R612 Vd 5V oo N 62 _ O x OV OV _ 5 5 ip 5V N 19 e 5 Ov N R248 A R245 si 6D la 42 N miles IC4 CN CN S x 5V OV es ov ov EE _ R222 29 6015 OV 009 0001 ROO5 co e z EN OV a O V OV 1 IS OVL Fig 6 5 The voltage amp circuit amplifies the DC current level detected by the detection transformer CT 1 Receiving this
106. ppns s WOO dU uiui eui se s ISIN UOISSIWA 15114 seDueuo WOO amod enp esiou ueDe 1no jnsuoo s rejep 104 10199 09 pesuepuoo ui pejejnunooe peu yeu HulAyipiuunysp esiou no Buiwojq pue esou eui juesaud ui HUIYONS ue JO SION peddois si ji yun 84 esiou uolyesado CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS 18YH6 RAS 25YH6 INDOOR UNIT Unit mm Service space 780 Front panel Cabinet air diflector 190 400 190 Drain gt When piping is drawn from the left side exchange the drain hose for the drain Drain cap connection port About 370 70 Narrow pipe 26 35 lt Power Wide pipe 29 52 Connecting cable 17 5 About 108 i 47 47 30 60 22 60 81 5 Vertical air deflector gt 15 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAC 18YH6 RAC 25YH6 OUTDOOR UNIT Unit mm VS cee ct TT T ORG EHI NEC RU t ee Air suction
107. proximately proportional to the input current of the air conditioner input current is controlled by using DC current Id detection resistor Reference If power module is defected self diagnosis lamps on the MAIN P W B may indicate as shown below D303 Table 3 1 Self diagnosis lamp Self diagnosis nd qnoda Blinks 2 Ip peak current cut LD301 imes MAIN P W B Abnormal low speed LD301 Blinks 3 rotation times Switching incomplete LD301 Blinks d times 44 JOINAWODOIOI JOJOW JosseJdujo x x x x PA x x x ui llinq O eAup pue eoi ep eAup JOLIOAU pue 691 1nus Sue pue Jaddn JejnduuoooJotUJ SIU V euin eu Wid episur SI g 9 Jamo pue 07 jeuBis jre4 s ndjno Ndl 51 yead pue J91J9AUI BU uoneJedo p ds uBiu urejqo e 1ndino s op p Ul UMOUS se u ndino si eAup peeds uBiu je yun ueuM eseud uoee 189 eui O Ndl 99 AGL 0 peueAuoo s euis AS A0 2 814 ul uwous se eu si p ds sejeJedo yun
108. r zo sss A wr LL 1 mm om Oy Qn T TT I reo 2 14 LL 1 a rn 2 CT 4P d e LT LT T ET eos LL munam u 5 C T E l P ET ES MEA weet LCC esos ass w ss Losos suma __ 114 esos roo iss 4 woe LL EL LL I RATING OH THERMISTOR EN R110 1 28 0 5 B100 110 Lo 4 NN l an R245 5 76 M 16 _____ DEF THERMISTER B 2 L E ee j T T LLLI rir r TAB TERMINAL trill _ pound do pu um Sow LLLLLLd Lo sos IBE JII T 5 _ 11 P T TI TT l T ruler Fue mre 10 Em s tg tH bz 4 1 _______ allel Ano 4 LL LLLLI 1 _____ 1 seo a wil ha R E A _ 88 uen weas ma j ROVA 1 oe ie T EIE wj 4 LI rules e eu a Pines 4 L T Pie ie 4 IST ru loot 5 cd 4 LI mu Mid 460 E 4 CITT muu pue E cS mE C E S MEE UE E 080 __ _ x OUTDOOR UNIT ELECTRIC ASSEMBLY U SC ene ee te ER iste UU U s 2 UU 4 CITT DL LLLLLL L T TIT TITI 21
109. r deflectors gt a Fig 4 2 Microcomputer Output Signals As the microcomputer s outputs change as shown in Fig 4 2 the coils of the auto sweep motor is excite to turn the rotor Table 4 1 shows the rotation angle of horizontal air deflectors Table 4 1 Auto sweep Motor Rotation MN Rotation angle per step Time per step ms Horizontal air deflectors 0 0882 32 5 Initial Setting Circuit IC401 e When power is supplied the microcomputer reads the data 12401 IC402 E7PROM and sets the preheating activation value and the rating and maximum speed of the compressor etc to their initial values e Data of self diagnosis mode is stored IC401 12402 data will not be erased even when power is turned off Microcomputer IC401 or IC402 E2PROM ov Fig 5 1 6 Power Supply 12V 102 THERMAL FUSE 35V Built in rigs ore CN10 terminal board m 6 gt E mE an otor eQ oe BIZ ATE u _ IM L111 ICP1 JW101 IA M P e i R114 2 S ES 9115 L 0113 JELE o e 2 N LM o x ue Q112 Cp 48 Dw 2 z R115 t _ _ e 7 2 s 5 y Ha o k lt ed VEZ ts B x M o 8 E GNG o 3
110. r heating This does not indicate a fault TROUBLE SHOOTING RAC 18YH6 25YH6 PRECAUTIONS FOR CHECKING Indoor Controller Outdoor Controller Power Switch oj motor Hemember that voltage of 175 V is applied to the OV line on the P W B or the like as shown in the right diagram 4 Ground voltage 4 Point line Grounding Always keep your hands and metallic things away N WARNING from the cabinet DANGER Don t install When using an the ground oscilloscope never u line ground it Don t forget that high voltage as noted in the figure above may apply to the oscilloscope A DISCHARGE PROCEDURE AND POWER SHUT OFF METHOD FOR POWER CIRCUIT Caution e Voltage of about 350 V is charged between the terminal of smoothing capacitors 375uF x 2 e During continuity check for each circuit part of the outdoor unit be sure to discharge the smoothing Capacitors Discharge Procedure 1 Turn off the power of the indoor unit or pull out the power supply plug 2 After power is turned off wait for 10 minutes or more Then remove electrical parts cover and apply soldering iron of 30 to 75 W for 15 seconds or more to 5 and R001 terminals on the main P W B as shown in the figure below in order to discharge voltage in smoothing Capacitor Do not u
111. rain if indoor temperature is higher than CLMXTP 6 When fan speed setting on remote control is or Auto mode and both room and outdoor temperatures data based on out door unit meet temperature judgment Off shown in the table 1 the compressor rpm will be limited to CKYMAX 7 When fan is set to Med compressor rpm will be limited to CJKMAX 8 When fan is set to Lo compressor rpm will be limited to CBEMAX 9 During Cool Dashed when room temperature reaches set temperature 1 C compressor rpm is actual rom x DWNRATEC 25 Cooling Sleep Operation Dehumidifying Operation Room temperature 1 hr l Set to 7 hours Cooling preset Sleep button 1 temperaure a _____ Operation meh ZZ Remote control Sleep ON PLU ee basic Med 2 Indoor fan operation EE pep h 3 Outdoor tn RR _________________ Horizontal air shut deflector Horizontal Reversing valve Facing down 4 Cooling on model Compressor speed n The sleep operation starts when the sleep button is pressed When the sleep button is set the maximum compressor speed is limited to CBEMAX and the indoor fan is set to sleep Lo The indoor fan speed does not change even when the fan speed mode is changed If sleep operation is canceled by the cancel button or sleep button all data is cleared STARCP rotation
112. se a soldering iron with transformer Otherwise thermal fuse inside transformer will be blown IN Vega 19 LEAD WIRE LF SOLDERING IRON 30 TO 75W 64 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAS 18YH6 25YH6 r ELEC COVER TRAY Removing electrical parts 1 Remove the electrical parts cover 2 3 Remove two lock screws 4 FIXTURE SCREW Remove the connectors from the heat exchange thermistor CN4 stepping motor and CN10 fan motor When installing the parts use caution not to pinch any code between the part and cabinet Remove the electrical parts in the direction of arrow CN2 PWB SUPPORTER PWB SUPPORTER ou CN8 N KU m oO Core PWB SUPPORTER PL I US 4 else v SUPPORTER SAN MN A INDICATING PWB HOLDER Sacre d ade 2 HOOK INDICATING PWB Removing control P W B 1 Remove the connectors from the CN2 and CN3 2 Remove the P W B from the P W B
113. sembly INDOOR UNIT RAS 18YH6 RAS 25YH6 1 Front Panel 1 Pull up the washable panel by holding it at both lower sides with both hands 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 Support wet ep m ses 3 Control P W B and Indicating P W B 1 Remove each connector from the lead wire 2 Remove the four P W B supports from the control P W B 3 Pull the support hook at the upper side of the indication lamp of the indicating P W B and pull out the PW B forward A ANC Control P W B TA DI fill I Tr o e EIR Indicating P W B Fig 4 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 Q j N ESS Z 75 SSS S Fig 3 87 4 Tangential air flow fan and fan motor 1 Remove two screws locking the drain pan 5 Remove the electrical box fixing screws and GND wire fixing 2 Press to lower the hook at the center of theunit a little and pull the screw claw forward to removethe drain pan 6 Remove the terminal plate fixing screw 9 DON ILZES e x 2777 7 A 77 11182 2 X Z HB KI 227259 CAH ZITA 22 222 lt 3 Remove the screws from the upper and lowerbe
114. t set in the operating circuit IPM using button y start and check the Does the unit operate for Check the position self diagnosis lamp approximately 2 seconds the sensor circuit status again LD303 coming on and then stop due to a failure of switching the lamp blinking 4 times Check the refrigerating cycle Check outdoor electrical parts 70 CHECKING THE INDOOR OUTDOOR UNIT ELECTRICAL PARTS AND REFRIGERATING M M Yes Trouble shoot according to the s ine indoor unit timer lamp blinking self diagnosis lighting mode J Run the unit using the following remote controller settings In the cooling season set the temperature to 16 C in the cooling mode Open the indoor unit and check the voltage between pins Nos 1 and 3 of CN3 on the indoor unit control P W B Normal DC35V 32 38V In the heating season set the temperature to 32 C in the heating mode Does the operation lamp light or blink a Is the voltage correct Red V Yes V No Yes Is the compressor running Check if the connecting cable connected incorrectly inserted Running Not running incompletely or disconnected Open the outdoor unit and observe the self diagnosis lamp LD301 Count how many times the lamp blinks Blinks other than 1 time Blinks 1 time Can the unit be operated using the outdoor unit service switch See the nameplate on the outdoor unit for operating Instructions
115. the defrosting operation temperature A thermistor is a negative resistor element which has the characteristics that the higher lower the temperature the lower higher the resistance When the compressor is heated the resistance of the Over heat thermistor becomes low and voltage to a pin 69 of microcomputer is increased Microcomputer compares the voltage at pin 69 with the internal set value if it is exceeded the set value microcomputer judges that the compressor is overheated and stops operation When frost forms on the outdoor heat exchanger the temperature at the exchanger drops abruptly Therefore the resistance of the Defrost thermistor becomes high and the voltage at pin 63 of microcomputer drops If this voltage becomes lower than the set value stored inside the microcomputer starts defrosting control During defrosting operation the microcomputer transfers the defrosting condition command to the indoor microcomputer via the circuit interface The microcomputer always reads the outdoor temperature via a thermistor microcomputer pin 64 an transfers it to the indoor unit thus controlling the compressor rotation speed according to the value set at the EEPROM in the indoor unit and switching the operation status outdoor fan on off etc in the dehumidifying mode The following shows the typical values of outdoor temperature in relation to the voltage Table 6 2 Outdoor temperature C 10 0 10 20 30 40 R303 V
116. the microcomputer converts it to a digital signal and compares it with the internal data to judge whether or not overload control is required lt During overload control gt The filter consisting of R245 and C217 removes high harmonic components from the voltage generate from the DC current flowing to the detection resistor and supplies it to 124 pin 5 IC4 forms a non inverting voltage amp circuit together with the peripheral elements The microcomputer stores the set values which vary according to the rotation speed When the DC current level exceeds the set value the microcomputer enters the overload control state The set Value is determined by the amplification of the voltage amp circuit Amplification high DC current low Amplification low current high Rc Fig 6 6 Voltage at microcomputer pin Command rotation speed Actual rotation speed Rotation speed of compressor 2 ID OVL Fig 6 5 The filter consisting of R245 and C217 removes high harmonic frequencies from the voltage generated by the current flowing to Detection resistor R245 and C217 average the voltage This voltage is then input to 1 4 pin 5 and supplied to microcomputer pin 60 The microcomputer compares this input with the set value and if the input exceeds the set value it enters overload control status Fig 6 6 shows the rotation speed control When the voltage at pin of the microcomputer exceeds the s
117. to Outdoor microcomputer 63 DC Fan Motor circuit has to match the Fan Motor revolution with instructed revolution Such as FG feedback Faster Instruction Slower Decrease pulse width FG feedback Slower Instruction Faster Increase pulse width FG pulse is also used for Fan Motor failure detection Microcomputer will monitor FG pulse 30 seconds after start the fan motor If there is no signal detected it will consider that the Fan Motor was malfunction and stop the operation In this case LD302 on main P W B will blink 12 times Fan Motor lock detected R107 and IC4 are used for Fan Motor over current 58 lt Reference gt When operation stop with LD301 blinks 12 times it may be caused by faulty DC fan motor In this case please check CN6 and CN12 connection first It makes Fan Motor Lock also if those connectors are in misconnection DC Fan Motor has broken invites 1A Fuse burned Please replace both DC Fan Motor and 1A Fuse together It will makes Fan Lock Stop when something has disturb the Fan rotation by inserting materials into propeller fan or ice has growing inside of outdoor unit by snowing It may make Fan Lock Stop by strong wind ex 17m sec or above against the Fan rotation In this case unit will be restart again after a while In case Fan Lock Stop even though the DC Fan Motor is rotating correctly the possible cause in Fan Motor problem or control board problem Stop after the Fan m
118. tput to pin 69 and amplifies by Q801 I F signal approx 38 kHz is generated by comparator then modulated by the signal from pin 69 of indoor microprocessor This modulated I F signal is then amplified and superimposed to DC 35V line via L801 and C802 of indoor interface circuit Fig 2 3 shows the waveforms at each component when data is transferred from outdoor microcomputer to indoor microcomputer The circuit operation of the outdoor receiving circuit is same as indoor receiving circuit 37 Fig 2 1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate with each other CONTROL R830 WS ESET E EE UI ar OV 49 I F RECEPTION Micro C801 Computer OV 5V TERMINAL gt BOARD oH Tu o 50 I F TRANSMISSION JW80 1 Or E OV oV ON 1 _________________________________________________ OUTDOOR UNIT MAIN P W B 65V z 35V C801 7 R802 Micro Computer Y I F TRANSMISSION C802 OV 800 Interface relay I F RECEPTION SDI OV N O o D L802 5 TERMINAL 6 BOARD NF COIL 2 nud IC5 1 2 Communications from indoor microcomputer to outdoor microcomputer Communications from outdoor microcomputer to indoor microcomputer Fig 2 1 Indoor Outdoor interface circuit 38 5V Outdoor microcomputer Pin 48 OV Pin61 a X 5V OV Indoor microcomputer
119. y e ejnpo A JOMOY YING AHp pue 99 SOIASP eAup e eAup SMOUS BI JINDAID SALIG P 45 In low speed operation 120 4 120 120 lt 120 120 V ut W V U W See ee ees v sv haha H nn vw Rp i ae gasses a ae hi i N L MRRUE md aug ac MN vata Mim mim Wal co Fig 4 2 Drive signal at point A V W Internal drive signal of IGBT c In high speed operation 120 120 M 120 x 120 44 120 V U W V W V U W ITT TIT IT E H E Sua TL FF 7 HN w Fig 4 3 Drive signal at n A Internal drive signal of IGBT 46 5 Power Circuit for P W B Fig 5 1 shows the power circuit for PW B AC220 230V o C D ail 161 ST STR L472 a 9 DBI A R41 T DL Lpp A sth TRANS 020 4 35V 005 R23 C31SR45SR46 14415 i D OV R01 i 17 021 15V bi Peo Z 16 AD31 18 12V 15 0V Fig 5
120. y to repair the printed circuit board on a grounded metal plate Body earth Elimik conductive band Clip for connection with a 1MQ grounding wire d Fig 2 Body Earth 6 Use a three wire type soldering iron including a grounding wire Metal plate of aluminium stainless steel etc Resistor of 1 MQ 1 2W Staple lt 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 10M or higher when ordinary iron is to be used 7 In checking circuits for maintenance inspection or some others be careful not to have the test probes of the measuring instrument shortcircuit a load circuit or the like A CAUTION 1 In quiet operation or stopping the running slight flowing noise of refrigerant in the refrigerating cycle is heard occasionally but this noise is not abnormal for the operation 2 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 3 The room air conditioner does not start automatically after recovery of the electric power failure for prevent ing fuse blowing Re press START STOP button after 3 minutes from when unit stopped 4 If the room air conditioner is stopped by adjusting thermostat or missoperation and re

Download Pdf Manuals

Related Search

Related Contents

Pioneer AVH-P7600D Car Video System User Manual    3x Magnification. Digital Zoom to 6x.  Worldwide Lighting W83147C28 Instructions / Assembly  Xerox ColorQube 8700 User's Manual  Manual Art 13218.indd  CONCIERGE CC5000-22SET UP and INSTALLATIONGUIDE    Manuale dell`hardware  KM-4050/KM-5050 使用説明書  

Copyright © All rights reserved. Failed to retrieve file