Home

SERVICE MANUAL

Contents

1.
2.
3. L L D D A ANGFR 003 3 2 DURNG STOP LD303 GOES OFF 112 AOTMALFUKTON SWITCH OFF MAIN POWER D0 NOT TOUCH THE SCREWS z WHEN STOPPED WITH POWER PWBs POWER CIRCUITHIC ETC SUPPLY THE OUTDOOR THE SYSTEM POWER Rue ror s UNT AT LEAST 10 MINUTES ODULE WHEN THE UNIT 15 BEFORE START THE TURNED HIGH VOLTAGE PEA CURRENT erect SERVICING WORK STILL REMAIN EVEN AFTER 2218 ini A POSITION DETECTION SIGNAL POWER MODULE THE UNIT IS TURNED OFF W SPEED IS NOT INPUT DURING OPERATION COMPRESSOR T B TIMES _ M
4. REACTOR MOUNTING BOARD YEL YEL A AXIAL HIC HYBRID IC BOARD SPM 2 R RADIAL RI R2 M MAIN BOARD RAE a ERNAL 2095 common dg POWER RELAY 812 DIODE STACK P1 e COMPRESSOR MOTOR E YEL RA O COMPONENT o IN RUSH R007 R008 Up wt d N CERAMIC 8 gt 22 Z om ELECTROLYTIC 5 RESISTORS RESISTORS CAPACITORS LEDS COILS m Reo WHT WHT zz 32323 MARKI RATING mRKIRATNG JEJS wn 8 NZ 1109909 R 5 R W W es MODEL 5 288 Um EP 3P ROOT 470K 5 2 A M R308 3 01K V6 C Hijos 007 001 C P M LTDGZA RED LOOT FBAOZMAZS0 2 5 i 9 6 15 8 R002 22 515 H R309 5 C002 0 01 Loca BE lo 1002 _ FBA04MA450 GREEN2 ov fm 9 R005 169K ts v4 A M R30 54K M C003 0 68 1003 1015 20132 1 p L002 1 2 R
5. MAIN PWB RE I EE Se TES PRANIE Oe a DOE pO RENE NR IEEE XE TTE guck ES x a 0901 L901 poo R K 35V INDOOR FAN MOTOR 21V d 21912 y S M TE INAL SS lt gt 0v BOARD 0901 gt zi 0 Ll 2 i oq e gt R911 I A ania AT 1 121 R913 I NOTES RESISTOR 1 0 MOUNT OHN 54 0112 TT N10 ETATO CAPAC TOR Eweo lt a gt ofp EN E o Poo For MOU K 2i alg d 1 amp 4 C CERAMIC CAPACITOR 27K 5 1 10 A R500 10K 5 1 10 A R657 10K 5 1 10 A R830 1K 5 1 10 C B 0 2 zL sk su D ELECTOLITIC CAPACITOR 112 5 o a mese iz 8 lt gt xj 9152 EE FORM AS BELOW R113 0 3 5 1 R A R502 0 5 1 10 A R660 5 1 10 C B R901 1 1 10 C B 4 HAND INSERT Z gt REG Ras 0903 m R i C SURFACE MOUNTING R114 750
6. 9 e oj 22 3 TIMER LAMP PANEL AS I pem LED6 GREEN m joooo og ooroo 25222922992 EE a TIMER LAMP Fig 1 Fig 2 No Timer indicator flashing mode Reason for display Section of estimated fault Four way valve faulty A 1 Four way valve faulty 1 29M Once E E B IR low 2 Disconnection in heat exchange 9 9 9 9 9 thermistor only during heating Outdoor unit forced operation Service SW in outdoor electrical parts 2 25 M Twice The outdoor unit is in forced operation or turned ON undergoing balancing after forced operation Indoor outdoor interface faulty 1 Indoor interface circuit 3 5 3 times The interface signal from the outdoor unit has 2 Outdoor interface circuit been interrupted Outdoor electrical assembly defective Please check at the outdoor electrical T ed lamp blinking LD301 and refer to 4 Pee 4 times self diagnosis lighting mode for outdoor unit Abnormal water level detection 1 Drain stopped up 5 i i 2 sec 6 times All stop when the float switch has been activated 2 Drain pump 3 Float switch Drain pump forced operation 1 Indoor P W B Main
7. DC brushless motor for compressor alo A P Ww w e 86 83 64 85 47 9 5V C608 12V 5 sl8I81 a mE a c TTE 6 24 5 C605 3 R605 5 C606 R606 5 C607 8607 o L 3i 82525 O Y 0V HIC No power Upper arm power Lower arm power supplied ON supplied ON supplied K 60 120 60 120 60 Induced voltage Vd 150 330 U phase terminal voltage B reference voltage 1 2Vd Detection point Spike voltage Comparing process Pole position detection signal Drive signal W 30 21 Fig 6 1 Rotor magnetic pole position detection circuit and voltage waveform at each point To detect U phase voltage at point is produced by driving motor induced voltage signal voltage at point and 1 2 voltage of Vd voltage at point and comparing with comparator e produced by delaying 30 from fall waveform For V phase and W phase in the same way as above drive signals are produced from voltages at point D and point Phases are shifted by 120 and 240 respectively comparing with U phase 275 V phase and W phase voltage at point D and voltage at point are produced in the same way as above Voltage at point is taken into indoo
8. 6 HITACHI HOW TO SET THE SLEEP TIMER 4 Indication Sleep timer 1 hour 2 hours 3 hours 7 hours Sleep timer off J 4 N Sleep Timer The device will continue working for the designated number of hours and then turn off Press the SLEEP button indoor unit will produce a beep The timer information will be displayed on the remote controller N A Example Setting 3 hours sleep time How to Cancel Reservation Press the CANCEL button The RESERVED sign goes out with a beep 16 Explanation of the sleep timer The device will control the FAN SPEED and room temperature automatically so as to be quiet and good for people s health NOTE e f you set the sleep timer after the off or on timer has been set the sleep timer becomes effective instead of the off or on timer set earlier You can not set other timer during sleep timer operation e After sleep timer time is up and when press sleep button again the sleep timer will be set as last setting e Sleep timer effective only once vam CIRCUIT BREAKER When you do not use the room air conditioner set the circuit breaker to OFF
9. Self diagnosis lamps LD303 302 301 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 continue normal operation when the electrical parts are normal or it will repeat operating for approx one minute and stop due to overload power limit cut or it will operate in the overload status Be sure to push the service switch again to stop the forced cool operation HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY C 1 Connect the large dia pipe side and small dia pipe side service valves using a pipe Parts to be prepared b Outdoor unit Connect the small diameter Compressor 1 Reducing union service value and the large Large dia service valve 2 8 6 35mm diameter service valve using the Reversing 1 2 12 7mm i i i val Reduci reducing and Copper Pipe vee LL and 3 8 2 Copper pipe 2 8 and 1 2 as shown on the right 3 Shorting leads __ Copper pipe 2 leads approx 10 cm long 2 8 with alligator clip or IC clip m DA Small diameter service valve minutes Charge re
10. Z 8 X SWE EE 5 00 ON J8 0EJEUD wio jenas Jejndujooouotru JOOPU OIH 65 Serial Communications Data 1 Outdoor message 2134 516 7 000000 1 Fan 7 step request 1 Compressor minimum rotation speed 4 MSB Compressor minimum rotation speed 3 Compressor minimum rotation speed 1 Compressor minimum rotation speed 2 Compressor minimum rotation speed 0 LSB 2134 516 7 1 OVL up 15 20 Actual compressor rotation speed 5 MSB Actual compressor rotation speed 4 Actual compressor rotation speed 2 Actual compressor rotation speed 3 Actual compressor rotation speed 1 2345670 Actual compressor rotation speed 0 LSB 1 Compressor during operation Compressor during operation Compressor command speed 7 MSB Compressor command speed 6 Compressor command speed 5 Compressor command speed 4 Compressor command speed 3 2131415670 Compressor command speed 2 1 Compressor command speed 1 Compressor command speed 0 LSB Outside temperature 7 MSB Outside temperature 6 Outside t
11. Indoor fan Ultra Lo Operation lamp Max WMAX 7 NOTE 11 Rating WSTD Wid E 3000 E 0 H Ema l gt gt ultra Hi 15sec Hi gt 15580 Hi Hi Outdoor fan Em Reversing valve heating on model Em Compressor speed 150sec Delay 150sec Delay 150sec Delay 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 rpm WMAX will maintain for 120 minutes if indoor temperature is higher than 18 C No time limit constrain if indoor temperature is lower than 18 C and outdoor temperature is lower than 2 C During Hotkeep or Def
12. eui Seu esnj v eui Jl sued Aue op d u lt S A uonoeuuoo e qeo 1081109 J 12000 dwel duie sisouBeip jjes eu sisouDeip jjes eui pip MOH Anuepuedepur jun Joopino aui MOH eui Buip1oooe un uid 1581 81 NO AS uid pue ussm eq SSI VE Guleq AG SI MO eui S e qeo pue 9 J8U18UM ees 0 sued anioajap Aue 104 uo uonduosep aui ees euuou Jewod S 918 jemod 16 5 siojloedeo 5 42616 JO SUeA aq osje sued 19410 yeu seu lewu eui SI N pue 1 paijddns Buleq SI jeuuouge 10 ON 98 Kelas Boe alu eui Uep oS 1281000 10 osje pu eui uo Ajddns samod Jo 1ndino Az L
13. asnd 109 JAMO APIS siojsisueJ 9914 pue eui epis y uo 101 15 94 eyeudued pue 5 y SMOUS g BH e 67 e DC 260 360V is input to system power module and system power module switches power supply current according to rotation position of magnet rotor The switching order is as shown in Fig 3 2 At point U is ON is ON circuit in Fig 3 1 At point U is chopped OFF is ON circuit in Fig 3 4 N w gt y U DYA V gt Vt IN U JA v w Upper arm transistor Lower arm Time transistor E B Fig 3 2 Switching order of power module e Upper arm transistor is controlled to ON OFF by 3 3kHz chopper signal Rotation speed of the compress is proportional to duty ratio ON time ON time OFF time of this chopper signal e Time T in Fig 3 2 shows the switching period and relation with rotation speed N of the compressor is shown by formula below N 60 2 X 1 T e Fig 3 3 shows voltage waveform at each point shown 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 U transistor chopped U transistor ON Voltage at 260V 360V Chopping period Chopping period 300u se
14. 109 MODEL RAD 25NH7A PART NO RAD 25NH7A Q TY UNIT PARTS NAME PMRAD 28MX DRAIN PAN PMRAMD 350BW FAN MOTOR SUPPORT RUBBER PMRAMD 350BW SPECIAL SCREW PMRAD 28MX DRAIN PUMP PMRAMD 350BW DRAIN HOSE ASSY PMRAMD 350BW FLOAT SWITCH PMRAD 18NH7 CYCLE ASSY PMRAS 10C8M BULB SUPPORT PMRAD 32CNH2 SIROCCO FAN PMRA 353B FAN BOLT PMRAD 32CNH2 FAN MOTOR 20W 1kg PMRAMD 40GX THERMISTOR HEAT PMRAD 28MX THERMISTOR TEMPERATURE PMRAD 25NH7A P W B MAIN PMRACA010KX2 FERITE CORE 935 PMRAM 90QH5 TERMINAL BOARD 2P PMRAD 18NH7A REMOTE CONTROL ASSEMBLY PMRAMJ 250BW INSULATOR PIPE PMRAD 28MX INSULATOR PIPE 236L PMRAD 18NH7 UPPER PLATE 2 PMRAD 25QH4 UPPER PLATE 1 PMRAD 28QH1 FAN MOTOR SUPPORT PMRAD 25QH4 BASE FAN MOTOR PMRAD 18NH7 FILTER PMRAD 28MX DRAIN PIPE PMRAS5645TWU DRAIN CAP PMRAS 287AX UNION 2 PMRAS 287AX UNION 3 110 MODEL RAD 35NH7A PART NO RAD 35NH7A Q TY UNIT PARTS NAME PMRAD 28MX R01 DRAIN PAN PMRAMD 350BW R03 FAN MOTOR SUPPORT RUBBER PMRAMD 350BW R04 SPECIAL SCREW PMRAD 28MX R02 DRAIN PUMP PMRAMD 350BW R05 DRAIN HOSE ASSY PMRAMD 350BW R11 FLOAT SWITCH PMRAD 18NH7 R01
15. FM 15V FM 15V P ov i a t t o R107 2 Vec 5 w iD NJ Y z 8 o x PWM control oltage V 9 ud 5 A 7 FG Pulse 5 R102 A CN6 Z FM 0V 5V 77 3 72 0 d Ap7V 1 DC Fan motor with control board Y 5V PQ102 R108 48 Y o a t FM 0V OV Y Microcomputer 33 3KHz amp R283 T2 R246 ov 2 C219 NW R 6 69 R297 pum lt ovy R298 Fa puse input C209 Fig 11 1 This model uses DC Fan Motor which has a controller circuit in the Motor This DC Fan Motor will rotate by control voltage apply to Vsp input Voltage range 1 7 to 7V DC Vsp high Faster Vsp low slower Vsp lower than 1 7V stop Motor will output FG pulse by following this motor revolution Outdoor Microprocessor will output PWM control signal from FMCHOP terminal by following the instruction from indoor Microprocessor This PWM control signal will convert to Vsp voltage by smoothing circuit Q101 amp RC filter 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 to Outdoor Microprocessor through PQ102 PQ102 is the isolator between Mic
16. 24 BACK SUCTION 1 PA 117 5 129 5 252 5 p n o k e 8 g amp 4 8 H Tine 5 a 1 47 288 18 18 028TP HOLE 117 5 18 382 19 627 2 3 2 8TP HOLE 319 5 319 5 y ui gt iD 10 e 41 334 334 3 92 8TP HOLE DISCHARGE 3 92 8TP HOLE 78 300 2 300 75 12 13 LT 1 59 o 27 292 8TP HOLE x 5 1 9 3 62 8TP HOLE 7 2 92 8TP HOLE 75 300 300 75 BOTTOM SUCTION A t 2 182 5 288 i a gt er 1 p E g AN 117 5 _he 382 hd A 388 246 9 92 8TP HOLE 303 206 7 2 02 8TP HOLE 2237 Z x 285 2 d oe Corm e ES 91 6 5 5e cr Cautions 1 Use insulated pipes for both large and small diameters
17. sev lt gt J 0821 D gt R127 Not mount R538 1K 5 1 10 C B R743 110 5 A 917 1 4 J 2 gt 2 2 ST 7 H M R128 10K 5 1 10 C A 8539 XX Not mount 8744 130 5 1 10 Hone R541 3 9K 5 1 4 R745 130 5 1 10 A 919 10K 1 1 10 A M R201 5 1K 5 118 A R746 130 5 892012 21K 1 1 10 A 21V BELG R202 5 iK 5 1 10 A R601 1K 5 A R921 12K 5 1 10 B a R203 2k 5 C A 8602 10K 5 1 10 120 5 R931 5 A 2 5 0932 SJ R204 5 1K 5 A R607 10k 5 1710 B 120k 5 R932 10K 5 1 10 A L801 R812 AN 4 8902 0v DRAIN PUMP R205 2 7K 5 1 8 C A R608 10K 5 1 10 B R805 120K 5 1 10 C B L MOTOR R609 tok 5 io C 120 5 1 10 B tok 5 1 10 A CN6 lie 0803 1932 R807 4 5 1 10 B 1102 1K 5 C A 10 6 2 2 1933 R931 D R301 12 7K 1 1 10 A R612 10K 5 1 105 A R810 680 5 1 10 C 21103 10K 5 1 10 A lt gt lt gt AAU R302112 7K 1 1710 A R620 5 1 10 R81
18. Transmission Sign The transmission sign blinks when a signal has been send TEMPERATURE Button Room temperuture setting Value will change quicker when keep pressing FAN SPEED Button This determines the fan speed Every time you press this button the intensity of circulation will change from amp AUTO to amp HI Z MED to LOW to SILENT This button allows selecting the optimal or preferred fan speed for each operation mode CANCEL Button Cancel timer reservation Precautions for Use Do not put the remote controller in the following places e Under direct sunlight e In the vicinity of a heater e Handle the remote controller carefully Do not drop it on the floor and protect it from water Once the outdoor unit stops it will not restart for about 3 minutes unless you turn the power switch off and on or unplug the power cord and plug it in again This is to protect the device and does not indicate a failure e f you press the FUNCTION selector button during operation the device may stop for about 3 minutes for protection 10 VARIOUS FUNCTIONS Auto Restart Control e If there is a power failure operation will be automatically restarted when the power is resumed with previous operation mode As the operation is not stopped by remote controller e f you intend not to continue the operation when the power is resumed switch off the power supp
19. MOUNT NOTMOUNT FORMMZOUNT 12742 C A 7 T 11041000 50 0 C jap Est Not mount L743 CHIP JUMPER A 081102 110511000 50 C 55 4 PH 4P 0523 0 1 25 CQ A 1106 47 25 D R A BUZZER L801 82518 101M 00 H500aA C A M 7 6 ov z cs24 0 1 25 A MODEL 1 ciio 0 1 25 EE 6541 100 50 per R 1932 BLNIIA601SPT 45000 2A A 12 5 1933 BLWLIAGOISPT 45000 24 A i 601 0 1 25 sy 5V WEEKLY TIMER L1101 EXCELSA35 A 12 O 81110 CONNECTOR L1102EXCELSA35 ATA w MOUNT MOUNT mne u 01102 555 lake NO FORM REMARK Nou mo DE foron Fon DIODE 9 PH 4P TOP WHITE H ROOM THERMISTOR A kywpoll MODEL MOUNT M nO 600 Dan xA 3P vV2 ivory DRAIN PUMP A 0101 mE g p 5 ZR 8P TOP 105 SEL2710K H LINK Oe QE 2 5 Gon IVORY EEPROM TEST 5 uw R 0111 01256 et 6 ZR 6P IVORY C FLASH A LD6 SEL2710E R A 0401 05184 gt LCP 0402 KDS4148U I PHTOP
20. Yes Does outdoor electrical part LD301 blink nine times No Yes Is the indoor outdoor unit communication signal superimposed on 35V DC of connection wires C and D 38kHz Approx 2Vp p Approx PF 35V ov Is the indoor transmitting signal being generated at Q801 s collector 38kHz Approx 2Vp p Transmission waveform Approx 35V m D ov Yes Does LD303 switch off several second after it lights Check outdoor electrical parts and repair any defective parts around the outdoor interface transmitting circuit Check the indoor interface transmitting circuit Replace IC801 Check outdoor electrical parts and repair any defective parts around the outdoor interface transmitting circuit Check outdoor electrical parts and repair any defective parts Perform final operation check 95 3 Only indoor fan does not operate other is normal Yes Yes Is approx 20 V DC generated between pins blue and red of Is 5 V DC generated between pins Replace indoor fan motor CN 10 when operated at high fan blue and yellow of CN10 speed during cooling Check disconnection etc of lead wires Are pulses of approx 33 Vp p generated at the collectors of Q901
21. 106 M54567P M C923 180 10 D R M PF RE R289 nel C HiCheos 128 C924 50 Fuser JUMPER AJM OH THERMISTOR R290 1 16 C_ HIC 1608 F001 250VTLNC25A M 250V25A R110 1 28KOHM 5 pem R291 116 608 M1 AX 8T 0 HIC 2002 2051 250 M 750 B100 10 R292 116 C HIC 4608 F101 2051 250 2 M 250V 2A 4400Ks150K XA 2P R293 146 HIC 1608 DEF THERMISTOR R297 SURGE PROTECTORS 9KOHM 5 R295 1716 C HIC hoos e _ z RELAYS B0 25 3400 2 Ue EIO MARK BLUE 1608 OUTDOOR TEMPERATURE _ R298 Wi C HiCheos VARSTORT 450120 M MARK MODEL THERMISTOR R299 1 16 C HiCheo8 VARSTOR2 4508120 P mpm R351433K0rM2 450NR12D TP TM POWER RELAY RLZ G4A TA PE M H 4 sep R300 eC HiCheoa xs RAY TH TW INTERFACE R RLA FTR F3AAOZZE H M R301 IG 608 IN RUSH R RL3 FTR F3AAO ZE H M R302 1 16 C HIC R303 1716 C R304 176 chos SWITCH R305 1 16 HCheos 6 1 16 C HIC 608 R307 1 16 C HIC 1608 M DEL 1 5 0612875 TRIM 35 eS BLOCK DIAGRAM MODEL RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A RAC 25NH5 RAC 35NH5 RAC 50NH5 Wired remote control gt Wired remote control receiver circuit INDOOR UNIT P
22. Notes 1 If the room temperature is cooling preset temperature 1 33 or less after 30 seconds from starting the operation the operation is done assuming as the preset temperature room temperature at the time 2 C The indoor fan is operated in the Lo mode During thermo OFF indoor fan will be OFF for 5 minutes and ON for 1 minute 2 3 When the operation is started by the themostat turning ON the start of the indoor fan is delayed 32 seconds after the start of compressor operation 4 The compressor is operated forcedly for 3 minutes after operation is started 5 The minimum ON time and OFF time of the compressor are 3 minutes 47 Basic Heating Operation Heating set temperature remote control set temperature Dash period TWMAX Fan speed set to auto Start Start stop switch Start Thermo OFF Preheat released Preheating judgment Ultra Hi 30sec 30sec 30sec 30sec 30sec 30sec 30sec gt 1 gt lt gt 10sec 10sec gt uia 30sec gt lt aida H 15sec 15sec H Control by Control gt lt Control by Control by I Control by gt heat exchanger temperature heat exchanger temperature heat exchanger temperature 10sec heat exchanger temperature heat exchanger temperature H lt lt Thermo judgment Defrost signal 5 min Preheating released
23. gt WHITE i STEPS MOTOR MO p EL RATED FORM 0 0403 05181 e pi M 9 XH 4P TOP BLACK H ICP1 ocP2E 20 A CDI 1 2 CCP2E 50 2 0A A 0821 KDS4148U B 0V gt CNIO TOP IVORY H 17D MOTOR A 0901 LFBOL C A SWITCH 0902 p1FL20u B STEPPING PH 8P WHITE H RECEIVING INDICATION PWB A SYMBOL NO 0932 09184 mm CN12 2 TOP WHITE H 35V POWER SUPPLY A 089 CN18 XA 2P TOP IVORY H FLOAT SWITCH A m i BACK 5V Swa ssh Geno 77 ape A B 8 H 7 CN1101 PA 6P TOP WHITE H H LINK A DRAIN PUMP SIDE HO RL GNi102 PA 4P TOP WHITE WIRED A LEE a PI static PC110I1 TLP421BL 5555912000 H A Beg Presse PC1L0QTLP421BL 9 eu INSTALLATION CNB USATI Not mount PH 10P W WHT 33 CIRCUIT DIAGRAM MODEL RAC 25NH5 RAC 35NH5 RAC 50NH5
24. Hicheos R922 JUMPER M C812 0 01 RAC 5ONH ONLY m R258 116 C R923 AIM MARK MODEL RED 0206 8 R259 i6 C R924 L TES 127 REVERSING R260 1 16 HIC 608 R925 207 HTM VALVE RF FUSER R261 176 C C901 001 K CHM R262 146 C HIC R263 146 C C903 20 25 D R M E R264 146 C HICheos 0102 12521 1 265 1 16 HIC t608 C905 1000P 2K C P R266 176 C906 470 50 701 1 521 1 R267 116 LCS C907 800p 50 C R M R268 to C HIC 125 RP C908 01 50 __ MARK MODEL lE emo 30 5o OVOVOVOV RZ76 176 C Hicho 10901 STR FGS23 M 220 25 DR VARIABLE RESISTOR R277 146 C 912 330 25 D R M PF 31 R278 116 C C93 RATING R279 146 C HIC 94 470 6 D R M PF 5 P005RD08 C915 120 16 D R M Lxv VR1 2000 300mV M R281 146 C HiCheos REG2 ISEO12N M C916 04 50 ELECTRIC R282 C HIC eos R283 1 16 C HIC t608 ICZ S24C02BF J TB HIC C918 0 001 EXPANSION R284 1716 C HiCh os 163 NJM2901M TE1 HIC C919 4 FUSE VALVE E ec He eos IC4 NJM2904M TE3 S 921 0 2 4 HiCheos 15 NJM2903V TEH S PF gjel R287 CHIC eos C922 01 50 Cc RIM MARK MODEL 35 8 OV R288 146 C
25. 25 CONSTRUCTION AND DIMENSIONAL DIAGRAM FOR OUTDOOR MODEL RAC 25NH5 RAC 35NH5 852 lt gt 1 280 26 28 750 76 6 K 56 165 s 5 c A O O SS mic 50 LO ULL i i IM a LL lo Juda Fa I 27 NE a Y 195 095 MODEL RAC 50NH5 340 22 298 20 gt lt 64 104 gt gt KE gt M M Handle Handle ae l AL 7 s Yo E Air suction Air outlet 201 grille Holes for anchor bolt 2 012 S 258 gt Fixing hole 507 lt x Notch for anchor bolt 2 012 Notchs 2796 lt gt 100 N More than Service space MAIN PARTS COMPONENT THERMOSTAT Thermostat Specifications ODEL RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A THERMOSTAT MODEL IC OPERATION MODE HEAT TEMPERATURE C F FAN MOTOR INDICATION 14
26. 3500 CMAX 2700 min 2700 4400 5500 CSTD 2450 min 2450 4000 5500 CKYMAX_TY1 2200 min 2200 3500 3500 CJKMAX 1800 min 1800 2800 2700 min CBEMAX 1600 min 1600 2200 2000 min WMIN 1500 min 1500 1500 min 1800 min CMIN 1500 min 1500 1500 min 1800 min STARTMC 60 Seconds 60 Seconds 60 Seconds 60 Seconds DWNRATEW 80 80 80 80 DWNRATEC 80 80 80 80 SHIFTW 5 00 C 5 00 C 5 00 C 5 00 C SHIFTC 1 66 C 1 66 C 1 66 C 1 66 C CLMXTP 30 00 C 30 00 C 30 00 C 30 00 C YNEOF 20 00 C 20 00 C 20 00 C 20 00 C TEION 0 00 C 0 00 C 0 00 C 0 00 C TEIOF 9 00 C 9 00 C 9 00 C 9 00 C 41 Table 2 ATCMAX Basic Cooling Operation Temperature Calculated difference compressor rpm 1 66 2265 min 2 2435 min 2 33 2600 min 2 66 2765 min sags oa 3 2935 mme 3 33 3100 min 3 66 3265 min 4 3435 Fan nodis tcs 4 33 3600 4 66 3765 min switch 3935 min Thermo judgment 4100 min 4265 min 4435 min 4600 min mem Engaged in the set fan speed in cases other than auto fan speed 4765 4935 min 5100 min 5265 5435 5600 5765 min 5935 6100 6265 6435 6600 6765 Outdoor fan 6935 m
27. 853 4 ee 122 100 10 R A C804 3 Not mount 0541 2601266P ml LOA 6505 x LTER 4 MT NET cies ocv og eie au SUR OSCILLATOR _ e 16501 SELECT pp R647 5 12V WHT 0127 Not mount 6822 10009 50 aeoo kTA15045 E o p E L FREQ FORM 5 G 5v 351 W ESET AX AU WOCON ID SETI 2e LAW y PHPORARY 01321 01 25 c ESE co RES1 CSTLIOMHZ10MHz R A 0401 TASH INPUT OEE 6 1 R R656 o X A 24 0 01 8 C A ZENER DIODE EEPROM 6 4 5382 1 0 FAN HIGH POWER 0 P p0 gt 101103 node 201 100 10 per R A 6825 0 1 2 bwen FoRMMOUNT A 525 5 8657 y F TEST R401 CLOCK HOT KEEP B9 94 NZ Qe 2 AMA CIRCUIT 58 gt B8 Z 20111806 2UJN2 cla 8402 s e K 0202 i R658 8146 8743 1143 e E TIE 302 0 1 25 B c901 330 6 EF R A a722 KRC402E c Zoi21PTZ204 B EE z gt M R745 8742 L742 6303 0 1 25 cm B c903 i000P 50 68 aao1 KRc402E c a ZDI31 PLz6 A 2 N R522 gt Sess REWOCON 17 OPERATION ao 4 AAA A a 4 GND R500 TA jst 760 R652 RMY Lll
28. in the fan operation mode Are collectors of Q903 approx Replace Q901 O Vv Replace L901 Replace Q903 Are microcomputer fan PWM Yes i or are pulses output in the fan operation mode No Replace micro computer Perform final operation check 4 Indoor fan speed does not change other is normal Yes Has the fan been stopped by Are microcomputer fan PWM remote control outputs micro computer pins 64 Hi Are the collectors of Q903 approx Replace micro computer Replace Q903 Replace Q901 Replace micro computer Perform final operation check 96 5 All systems stop from several seconds to several minutes after operation is started all indicators are also off Set to the Hi fan mode The operation lamp lights once and goes out in 5 10 seconds 42 Yes Disconnect CN10 and set to the fan mode again The operation lamp lights once and goes out in 5 10 seconds Check to see if shorting etc has occurred in the P W B pattern Check to see if the indoor fan is touching the chassis etc If it does repair Can the indoor fan be lightly turned by hand Set the power switch to off to check Replace the indoor fan motor 97 CHECKING THE OUTDOOR UNIT ELECTRICAL PARTS MODEL RAC 25NH5 RAC 35NH5 RAC 50NH5 osje 219 9064 L L
29. 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 P C boards or the like on which the parts mentioned in 1 and 2 of this paragraph are equipped Items to be observed in handling 1 Use a conductive container for carrying and storing of parts Even rejected goods should be handled in the same way A conductive polyvinyl bag IC Conductive sponge Fig 1 Conductive Container 2 When any part is 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 careful not to fail to turn off power when you repair the printed circuit board At the same time try to repair the printed circuit board on a grounded metal plate Body earth Elimik conductive band Clip for connection with a 1MO grounding wire Fig 2 Body Earth 6 Use a three wire type soldering iron includ
30. 4 04 0 1 25 6904 0 1 25 0 a802 KRA302E c Zo201MTZJ278 OD 0201 T 0521 1 INDOOR FAN RPM FEEDBACK FLASH INPUT 5je KI 04037 OOO 2 ered f i EE Z TM Ex c305 1 16 a803 2SC3441E c s 70541JRD22UNN2 m al ODA 5 RE ot n P34 DEFLECTOE EFLEGTOER ES I BE RT 0651 2 2 C401 0 1 25 C P C A 909 10 16 D VX R 0821 4075 A ZD901 UDZ 15B 6 B ZR 8P W 5 gt 10401 S WIN SUB col E Lu C916 Not mount NDUCT ZR OP 4 4 4 4 5 m 8651 0901 2SJ245S Bd d d v allel S S 6932 1 16 06 a902 2502462L0 B SYWBOLJMODEL RATED Form MOUNT 0v Pese p eal E L oy 2T 0v C501 0 1 25 C C B 0903 25 3360 B 1101 106 820 82 8 1 34 H A z le je je je E E E SPO uu C502 0 1 25 C F B BIB EI 10P 0932 2505209 A L111RCH108 561 5608 0 44 H A y y y YA YV V Y T 3 K x 2 WHT 0505 0 1 25 jc C C11011000P 50 C 0933 KTC4075E A L501 cHIP c B ES le E 2222 n 25 110211000 50 CHIP JUMPER L741 0 JUMPER C A o ose e 2525 0122 n 01108 0 1 25 D C B
31. HOW TO USE THE AIR CONDITIONER EFFECTIVELY An average room temperature setting is probably the best for you as well as being economical Excessive cooling or heating is not recommended for health reasons High electricity bills may also result e Close the curtains or blinds to prevent heat from flowing into or escaping the room as well as to make more effective use of electricity 2 At intervals the doors and windows should be opened to let fresh air in A CAUTION sure the room is ventilated when operating the air conditioner at the same time as other heating appliances 3 Using the timer is recommended before going to sleep or going out 4 The following must never be used for cleaning the indoor and outdoor units Benzine thinner and scrub can damage plastic surfaces or coating Hot water above 40 C can shrink the filter and deform plastic parts 5 Do not block the air intake and air outlet Do not block the air outlets and intakes of the indoor and outdoor units with curtains or other obstacles which could degrade air conditioner performance and cause unit failure 18 THE IDEAL WAYS OF OPERATION Suitable Room Temperature A Warning Freezing temperature is bad for health and a waste of electric power Ventilation N A Caution Do not close the room for a long period of time Occasionally open the door and windows to allow the
32. 08 HCsze 905 100 fo ORM w TRANSISTORS MODEL 1335 S 0 vom js zl AML 07 22 56 m U gt 2 2 3216 x ROT 8 8 ABIDE 554 i R521 10K HIC reos MARK MEE SV E EB ONG wem i CNT GRY R522 10K 5 0101 254673 R M JUMPERS _ 5209001 J MN CT 10P RES bahet Aches R523 K C HiCheos C201 0047 25 __ 0102 5 R M 4 1 FM 0V uu R196 K HIC os 6524 10K 1 6 HiCheos C204 0 047 25 _ C C HCheos 0103 2SC3246 RIM MARK MODEL 102 C205 22 Rf R197 1 5 R525 10K 5 6 C205 1 BO D RIM vr sort Wg 20401 R198 Hicj os 8526 HCheos C206 0 047 5 HChos WZ EXIST AIM R106 P 23 lt lt DDD 0 5 0 0 42 40 40 99 4 40 R199 5 1 16 C HIC 1608 R531 54K 5 116 HIC 1608 C207 01 25 C C 2SC2462LC JW3 NONE AIM 0 OV OV 5y 12V 6532 5 1K 526 1 16 HiCh os C208 0 047 25 C C JUMPER C 5 R533 5 5 HiCheos C209 0 047 ps C C wH R200 me C Hicheos R534 54K xvi C Hicheos C210 00047 50 C
33. 4 Z V 4 V Sound wave E boc Se gt NN Fig 2 2 Buzzer Operation 55 3 Room Temperature Thermistor Circuit e Fig 3 1 shows the room temperature e The voltage depends on the room thermistor circuit temperature as shown in Fig 4 2 5V Room temperature thermistor R305 Room temp input Voltage at 0 10 20 30 40 Room temperature C Fig 3 2 4 Heat exchanger temperature thermistor circuit 5V Heat exchanger temperature thermistor Microcomputer R306 Heat exchanger temperature input Fig 4 1 e The circuit detects the indoor heat un exchanger temperature and controls the following 1 Preheating 2 Low temperature defrosting during cooling and dehumidifying operation 3 Detection of the reversing valve 5 non operation heat exchanger temperature thermistor open The voltage at depends on the heat exchanger temperature as shown in Fig 4 1 10 0 10 20 30 40 Heat exchanger temperature C Fig 4 2 56 5 Initial Setting Circuit IC401 e When power is supplied the microcomputer reads the data in 401 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 in IC401 data will not be erased even when power is tu
34. 59 Model RAC 25NH5 RAC 35NH5 RAC 50NH5 1 BOARD Power Circuit REACTOR POWER P W B TERMNAL di Te H 5 STACK 25A FUSE NF COIL1 COIL POWER RELAY 88 al rrr 18 at ABSORBER BST R007 5 ICP RELAY i 1 TB2 4 1 1 me 5 DIODE STACK 2 RC2 E 002 gom B 8 cois 0008 gt z Fig 1 1 e This circuit full wave rectifies 220 240V AC applied between terminals L and N and boosts it to a required voltage with the active module to create a DC voltage The voltage becomes 260 360V when the compressor is operated 1 Active module The active filter consisting of a reactor and switching element eliminates higher harmonic components contained in the current generated when the compressor is operated and improves the power factor Diode stacks These rectify the 220 240V AC from terminals L and N to a DC power supply Reference In case of malfunction or defective connection Immediately after the compressor starts it may stop due to abnormally low speed active error etc The compressor may continue to operate normally but the power factor will decrease the operation current will increase a
35. Off timer during stop Change in reserved time 2 Srart stop switch 2 Reserve switch gm Cancel switch 5 On timer Operation temp Timer tam a Change in reserved time during operation Start stop switch Reserve switch Cancel switch Operation lamp ___ Off gt On Timer lamp On gt Off Timer memory oa ON Og OFF Ong OFF Off gt On timer On gt Off timer On gt Off timer Off gt On timer during operation during stop Changes from Hi to Med or Changes between Lo and Med Set to ultra Lo Lo Med ultra Hi or stop depending on the room temperature Operating mode is judged by room temperature and outdoor temperature Lo depending on room depending on the room temperature time and heat exchange temperature Set to stop if the room temperature is 18 C in the Lo i i ina i 1 Judging by outdoor temperature temperature Temperature division Fan speed ultra Lo mode other than during preheating cooling is recovered at 18 33 C 1 ging Operating mode is judged by outdoor temperature Division 1 Lo When the compressor is running at maximum speed Only when the mode is not restricted by this judgment the judgment by room temperature in the next paragraph Ternperature set Division 2 Lo during hot dash or when recovered from defrosting left will be performed
36. When it does not cool well e 15 the air flow of the outdoor unit obstructed When it does not hot well Are the doors or windows opened or is there any source of heat in the room Is the set temperature suitable Notes e In quiet or stop operation the following phenomena may occassionally occur but they are not abnormal for the operation 1 Slight flowing noise of refrigerant in the refrigerating cycle 2 Slight rubbing noise from the fan casing which is cooled and then gradually 4 warmed as operation stops The odor will possibly be emitted from the room air conditioner because the various odor emitted by smoke foodstuffs cosmetics and so on sticks to it So the air filter and the evaporator regularly must be cleaned to reduce the odor m e Please contact your sales agent immediately if the air conditioner still fails to operate normally after the above inspections Inform your agent of the model of your unit production number date of installation Please also inform him regarding the fault e Power supply shall be connected at the rated voltage otherwise electronic component of the unit will be broken or could not reach the specified capacity 22 Please note On switching on the equipment particularly when the room light is dimmed a slight brightness fluctuation may occur This is of no consequence The conditions of the local Power Supply Companies are to be observed
37. 1 o dE Check to see whether the F cable is connected incorrectly woa 0 or disconnected EES u DN uu ol Normal II X ILI JI Self diagnosis lamps Service switch 10303 302 301 Does LD301 blink one time Repeats 0 25 second on and 2 second off Blinking other than One time blinking one time Press the service switch for 1 sec Does the compressor operate TN After checking be sure to press the service switch to stop the operation No See ET door unit self diagnosis lamp lighting mode Z Soe C Check the refrigerating cycle Check the outdoor electrica paris check the indoor electrical pars 93 Yes CHECKING INDOOR UNIT ELECTRICAL PARTS 1 Power does not come on no operation No No Is DC 35V being generated between Is AC 220 240V AC being generated terminals C and D on the terminal between terminals and on the gt ara Meu Praia and board outdoor unit terminal board p y part Is DC 35V being generated between Yes Check the indoor outdoor unit terminals C and D on the outdoor connection cable and correct any defective section wrong connection incomplete insertion reversed No Check the outdoor unit power circuit and repair the defective section unit terminal board No Are control voltages 12V 5V Check according to the proper
38. 35 3 20 2 92 5 70 5 24 9 20 8 40 kW 1 80 0 9 2 5 2 50 0 9 3 0 3 50 0 9 4 0 5 0 0 9 5 6 CAPACITY B T U h 6 150 3 070 8 540 8 540 3 070 10 240 11 950 3 070 13 660 17 070 3 070 19 120 TOTAL INPUT W 690 155 1 050 970 155 1 400 1 700 155 1 920 2 300 155 2 530 TOTAL AMPERES A 3 20 2 92 4 50 4 10 7 84 7 19 10 60 9 70 kW 2 50 0 9 3 2 3 50 0 9 5 0 4 80 0 9 6 6 6 0 0 9 7 5 CAPACITY B T U h 8 540 3 070 10 930 11 950 3 070 17 070 16 390 3 070 22 530 20 490 3 070 25 610 750 750 750 750 750 850 DIMENSIONS 235 235 570 235 570 650 mm 400 400 280 400 280 298 NET WEIGHT 19 19 38 19 38 60 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT ROOM AIR CONDITIONER INDOOR UNIT OUTDOOR UNIT MAY 2008 Refrigeration amp Air Conditioning Division 10 Any inflammable thing should never LR x ted 11 SAFETY DURING REPAIR WORK In order to disassemble and repair the unit in question be sure to disconnect the power cord plug from the power outlet before starting the work If it is necessary to replace any parts they should be replaced with respective genuine parts for the unit and the replacement must be effected in correct manner according to t
39. 6 i 7 times When the knob of drain pump test switch at Indoor P W B main slide to test position Room thermistor or heat exchanger Room thermistor 7 thermistor is faulty 2 Heat exchanger thermistor s i E 9 times When room thermistor or heat exchanger thermistor is opened circuit or short circuit DC fan motor overcurrent detection Indoor fan locked 8 i 10 times Overcurrent in indoor DC fan motor has been 2 Indoor fan motor detected 3 Indoor P W B Main X 5 401 data reading fault C401 faulty 9 LE 13 times There was error in the data read from 1 401 Hf Lights for 0 35 sec at interval of 0 35 lt Cautions gt 1 the interface circuit is faulty when power is supplied the self diagnosis display will not be displayed 2 f the indoor unit does not operate at all check to see if the connecting cable is connected or disconnected 3 To check operation again when the timer lamp is blinking you can use the remote control for operation except for mode mark 1 91 SELF DIAGNOSIS LIGHTING MODE MODEL RAC 25NH5 RAC 35NH5 RAC 50NH5
40. 8 1 the basic operations of each circuit block and Fig 8 2 the system configuration Detection Resistor R24 AW DC Current SPM2 HIC 41 9 92 F cr 8 ov ov Direct Current P2 20 O DC260 380V EN E 22 wor ite 71 MAIN PW B C205 ov HIC 6869 6D EMR 2 ca is 8 Y ov OV 5V s 6 a R245 2 7 AM 0 d 577 R248 15 8 u e 2 ov l 5V ag 4 MICROCOMPUTER N E ila 0104 8005 R222 G tt T2829 w Y OV M Fig 8 1 Microcomputer and Peripheral Circuits Table 8 1 Circuit block Basic operation Detects DC current flowing power module and during overcurrent instantaneous value flows stops upper lower arm drive circuits and also produces lp signal by which drive signal output is stopped Peak current cutoff circuit Compares voltage detected amplified and input to HIC with set voltage value in Set value circuit microcomputer and controls overload when set value exceeds input voltage Voltage amplifier Voltage amplifies DC current level detected by the detection resistor and inputs circuit this to microcomputer Internal or external overload is judged in microcomputer Reset circuit Produces reset
41. CYCLE ASSY PMRAS 10C8M R03 BULB SUPPORT PMRAD 32CNH2 S06 SIROCCO FAN PMRA 353B R04 FAN BOLT PMRAD 32CNH2 05 FAN MOTOR 20W 1kg PMRAMD 40GX R02 THERMISTOR HEAT PMRAD 28MX R05 THERMISTOR TEMPERATURE PMRAD 35NH7A S01 P W B MAIN PMRAC4010KX2 508 FERITE CORE 935 PMRAM 90QH5 901 TERMINAL BOARD 2P PMRAD 18NH7A R02 REMOTE CONTROL ASSEMBLY PMRAMJ 250BW R09 INSULATOR PIPE PMRAD 28MX R09 INSULATOR PIPE 236L PMRAD 18NH7 S03 UPPER PLATE 2 PMRAD 25QH4 S04 UPPER PLATE 1 PMRAD 28QH1 S07 FAN MOTOR SUPPORT PMRAD 25QH4 01 FAN MOTOR PMRAD 18NH7 002 FILTER PMRAD 28MX R03 DRAIN PIPE PMRAS5645TWU R08 DRAIN CAP PMRAS 287AX S01 UNION 2 PMRAS 287AX 502 UNION 3 MODEL RAD 50NH7A PART NO RAD 50NH7A Q TY UNIT PARTS NAME PMRAD 28MX DRAIN PAN PMRAMD 350BW FAN MOTOR SUPPORT RUBBER PMRAMD 350BW SPECIAL SCREW PMRAD 28MX DRAIN PUMP PMRAMD 350BW DRAIN HOSE ASSY PMRAMD 350BW FLOAT SWITCH PMRAD 50NH7 CYCLE ASSY PMRAS 10C8M BULB SUPPORT PMRAD 32CNH2 SIROCCO FAN PMRA 353B FAN BOLT PMRAD 32CNH2 FAN MOTOR 20W 1kg PMRAMD 40GX THERMISTOR HEAT PMRAD 28MX THERMISTOR TEMPERATURE PMRAD 50NH7A P W B MAIN PMRAC4010KX2
42. Note e Avoid to use the room air conditioner for cooling operation when the outside temperature is below 21 70 F The recommended maximum and minimum operating temperatures of the hot and cold sides should be as below Cooling Heating Minimum Maximum Minimum Maximum Dry bulb C 21 32 20 27 Indoor Wet bulb C 15 23 12 19 Dry bulb C 21 43 2 21 Outd ebd Wet bulb C 15 26 15 CONSTRUCTION AND DIMENSIONAL DIAGRAM FOR INDOOR MODEL RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A Unit mm Electric box wired remote controller Length 15m Possible to move Right side Hanger 70 Use for hanging unit 8 T 1281 LO gt 621 9 1 x He N e N nls J 7 FELL 19 5 B e t Drain hose r T o I s oret ed gcc m 1 D 4 SURE eo 4 20 T 35 750 gt lt gt 790 Narrow pipe 96 35 Wide pipe 99 52 Wide pipe 912 7 1 Lu FT Rh gt A 3 amp m 5
43. RN1402 NONE AIM d i 608 I 1 R201 116 C Hicheos R535 54 lt 5 1 6 C Hicjteos C21 0 047 25 25C2462LC A EXE 7 R202 nel C HiCheos R536 5 1K 46 Hicheos C212 0 047 o C C JW8 EXIST AIM 810704 R05 V 1 lt R605 R203 1 16 C HIC C213 0 047 25 C C HIC JW9 NONE AIM W S Sz 12V Y 5V R204 A76 C C214 0 068 H C C 1440 CHP JUMPER HC 0 2 Ts t TR R205 1 6 C HiCheos R601 2K xw C Hich os C215 0 047 25 IC C 25C2462L oV oV 22 1 R206 6 C HiCheos 6602 2k 59 1 6 HiCheos C216 0 0047 50 C 608 2SC2462L QN SLE s g 2 lt d R207 16 C HiCheos R603 2K Hicheos 27 22 63 D C wx 2SC2462L 12V 12V 57 QV R607 R208 6 C HiCheos R604 100 6 Hicheos 28 01 16 CTC 2524621 T ME Le 4 R209 ane C HiCheos R605 100 5 Hicheos C219 22 so D C HK wx 2SC2462L DI6DES 801 cat POWER cT uNRSH E n lt T R210 Hicheos R606 100 C Hicheos C220 0 047 25 C 2SC2462L e I lt RLA ZIM con 2 3 current sa ru L R211 HiCheos R607 100 C Hicheos C221 01 25 C MARK MODEL BOIS R212 ael C HiCheos R608 402K 196 B 6 C Hicheos 6222 04 6 C Hicheo 5 5 BN
44. a al elel lz 5 GEO S lo TESTS lo 101 0 22 50 r R A 6620 0 125 00 2569518 a rorttJw2340w 3 Hans EJE Jej e F LZ A 4 HGH PRESSURE 2102 63 per R 0651 0 1 25 66 C 0112 2505209 a Reezkiarsosapi lt y gt 81103 630 B 0113 2505209 1840 1 824 04 T O ZTR alo ag 0v 1 i 111 2 2 10 68 A 6711 0 11 25 A 0114 Not mount S z E E E I E E X T 6112 1000 50 0 8 A 0115 15045 A 10501 7 20 aA ROOM THERMISTOR 88 ES z es EIE C1101 601 61130 047 25 C D C A R 250 10 0 2 ez zm E ZIE EE le EE 0116 KRC402E B25 50 3950K 2 e e AUTO C114 220 35 D PF R A 1 a E S ie 45802 RESTART 1671 1 106500 A N RT mam 8646 8641 CANCEL C801 150P C B 9201 256246216 c a 1680 1 5 53 sz 2l Bia gt s EE UST W E 116 Not mount 0802 0 22 5 F R A 9202 25 112150 A 10901KIA393F cle d KE ONE FLASH INPUT Ed 7 L0 INDICATION PWB e DROS LEK E PERE ANE E 41 L 1 5 BE
45. are connected in reverse of diagram below it is normal Furthermore compare how indicator swings at U V and W phases If indicator swings the same way at each point it is normal 107 MODEL RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A PARTS LIST AND DIAGRAM INDOOR UNIT 108 MODEL RAD 18NH7A PART NO RAD 18NH7A Q TY UNIT PARTS NAME PMRAD 28MX DRAIN PAN PMRAMD 350BW FAN MOTOR SUPPORT RUBBER PMRAMD 350BW SPECIAL SCREW PMRAD 28MX DRAIN PUMP PMRAMD 350BW DRAIN HOSE ASSY PMRAMD 350BW FLOAT SWITCH PMRAD 18NH7 CYCLE ASSY PMRAS 10C8M BULB SUPPORT PMRAD 32CNH2 SIROCCO FAN PMRA 353B FAN BOLT PMRAD 32CNH2 FAN MOTOR 20W 1kg PMRAMD 40GX THERMISTOR HEAT PMRAD 28MX THERMISTOR TEMPERATURE PMRAD 18NH7 P W B MAIN PMRACA010KX2 FERITE CORE 935 PMRAM 90QH5 TERMINAL BOARD 2P PMRAD 18NH7A REMOTE CONTROL ASSEMBLY PMRAMJ 250BW INSULATOR PIPE PMRAD 28MX INSULATOR PIPE 236L PMRAD 18NH7 UPPER PLATE 2 PMRAD 25QH4 UPPER PLATE 1 PMRAD 28QH1 FAN MOTOR SUPPORT PMRAD 25QH4 BASE FAN MOTOR PMRAD 18NH7 FILTER PMRAD 28MX DRAIN PIPE PMRAS5645TWU DRAIN CAP PMRAS 287AX UNION 2 PMRAS 287AX UNION 3
46. 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 for heating This does not indicate a fault TROUBLE SHOOTING Model DANGER 1 Remember that the OV line is biased to 155 170V in reference to the ground level Also note that it takes about 10 minutes until the voltage fall after the power switch is turned off DANGER When using an oscilloscope never ground it Don t forget that high voltages as noted above may apply to the oscilloscope Outdoor unit P W B i ll A III I RAC 25NH5 RAC 35NH5 RAC 50NH5 PRECAUTIONS FOR CHECKING Powe
47. method being generated normally for checking the power circuit Do the air deflectors perform initial Yes Check the indication P W B operation when the power supply is connection cord and light receiving turned on and off unit No Is the microcomputer reset input Check the reset circuit and repair pin 7 Hi any defective section Yes Is the microcomputer clock signal No Replace the microcomputer and 10MHz at pin 9 2 being po OSCillator generated normally Yes Replace the P W B Main Perform final operation check 94 2 Outdoor unit does not operate but receives remote infrared signal Set to room temperature 16 C in the cooling mode or to 32 C in the heating mode and press the start stop button Remove the outdoor unit cover and electrical parts cover and check self diagnosis lamp LD301 Self diagnosis lamps LD303 302 301 Does LD301 blink one time Repeats 0 25 second on and 2 second off Check the room temperature thermistor if it is defective replace it lt Normal values gt 10 C approx 20k2 25 C approx 10kQ 30 C gt approx 8kQ Check the heat exchanger thermistor if it is defective replace it lt Normal values gt 10 gt approx 20kQ 25 C gt approx 10kQ 30 C approx 8kQ
48. sleep Lo 3 30 minutes after the sleep key is set the sleep shift of temperature starts and upper shift is made at least 6 times If 25 C is not reached after 6 shifts shifts repeat unit 25 C is reached 4 The sleep shift upper value of set temperature is 28 C 5 After 6 hours a shift down to the initial set temperature is made at a rate of 0 33 C 5 min 6 If the operation mode is changed during sleep operation the set temperature is cleared and shift starts from the point when switching is made 7 The indoor fan speed does not change even when the fan speed mode is changed 8 When operation is stopped during sleep operation the set temperature when stopped as well as the time continue to be counted 9 If the set lime is changed during sleep operation all data including set temperature time etc is cleared and restarted 10 If sleep operation is canceled by the cancel key or sleep key all data is cleared 45 Dehumidifying 30sec Room temperature judgement Room temperature Cooling preset temperaure Room temperature judgement Start Stop Switch Operation lamp 5 Thermostat judgement sid res ean p Y 9 Lo mmm Hi 15 sec Delay gl 15 sec 15 sec Med E Reversing valve po Outdoor fan rotation speed Compressor
49. 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 50 F 6 This room air conditioner the reverse cycle should not be used when the outside temperature is below 15 5 F 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 SPECIFICATIONS RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A RAC 25NH5 RAC 50NH5 RAC 35NH5 FAN MOTOR 20W FAN MOTOR CAPACITOR NO FAN MOTOR PROTECTOR NO COMPRESSOR JU1012D JU1013D COMPRESSOR MOTOR CAPACITOR OVERLOAD PROTECTOR OVERHEAT PROTECTOR FUSE for MICROPROCESSOR POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL REFRIGERANT CHARGING UNIT 11509 14009 VOLUME Refrigerant 410A PIPES MAX 20m WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE Indoor unit installation A CAUTION Always install the indoor unit at level If the indo
50. the following energy charges the primary windings of the transformer Energy LI 2 Here L Primary inductance Current when is off This energy discharges to the secondary windings during power off That is C910 C911 C912 C914 is charged according to the turn ratio of each winding e Atthe start an overcurrent flows to IC901 because of the charged current at C910 C911 C912 C914 e The drain current at 901 generates a voltage across R906 If it exceeds the IC901 base voltage it sets the 901 gate voltage to e R906 limits the gate voltage to prevent excessive collector current from flowing to IC901 Reference If the power circuit for P W B seems to be faulty 1 Make sure that 5V and 12V on the control P W B upper arm U V and W and the lower arm power voltage are the specified values 2 When only the 5V output is low REG 1 regulator faulty 5V OV shorted output is too high or REG 1 is abnormal 3 When 12V and 5V are abnormal The following defects can be considered Fan operation power rush prevention relay shorting in relay etc 2 Microcomputer is abnormal G REG 1 regulator is abnormal etc Shorting on primary circuits When shorting occurs in the secondary circuits there is no abnormality in the primary circuits because of overcurrent protection The voltage rises when an opening occurs in the primary circuits or the feedback system is abnormal 4 When 15V and 17V are ab
51. voltage Trip signal Modulates chopper signal to drive signal and stops according to presence ab synthesis circuit sence of Ip signal or reset signal 76 DC 260V 360V O 5V Reset circuit Reset Voltage Chopper signal c eo synthesis circuit signal Chopper Drive Circuit Peak current cut off circuit Over load external gt 5 setting circuit a o S E IP signal DC 5 Current 8 evel Current amplified Fig 8 2 e The following describes the operations of each circuit in detail 1 Peak current cut off circuit Fig 8 3 Peak Current Cut off Circuit and Waveforms at Each Section DC current Id 21 27A for RAC 50NH5 Drive signal Power module DC current j Been gt resistor Voltage at point 1 05V 1 35V for RAC 50NH5 Voltage at point B SPM2 Main P W B Negative Terminal HIC ee nec 2 CN14 current fe Oe ay LG ee ER 2 w 6 OHO 8 3 u C1 1 8 I Outdoor Kii F microcomputer 4 ANN 9 l A I e Lo 1 d x I l M Detection I resistor as E ov Fig 8 3 e The lp cut off cir
52. 09 52 912 7 REVERSING VALVE 912 7 q 012 7 012 7 ELECTRIC EXPANSION VALVE SERVICE VALVE 1 4 06 35 s 912 7 06 35 SINGLE ENDED 26 STRAINER STRANWER UNION 1 4 CHARGING PIPE 53 REFRIGERATING CYCLE DIAGRAM MODEL RAD 50NH7A RAC 50NH5 COOLING DEHUMIDIFYING DEFROSTING OUTDOOR UNIT SERVICE VALVE INDOOR UNIT 1 2 SINGLE ENDED 2 UNION 1 2 012 ce SUCTION 912 7 o TANK 08 0 9 aS SS REVERSING 4 S LATO VALVE Le e 5 912 7 t I II S e 35 912 7 gt w 06 35 LU Liss z NS Z q ELECTRIC Y EXPANSION VALVE GI TJ SERVICE VALVE 1 4 e UJ 0625 _ AGS STRAINER 2 et 96 35 SINGLE ENDED 69 0 STRAINER HEATING OUTDOOR UNIT SERVICE VALVE INDOOR UN
53. 0CNH2 FAN MOTOR 40W PMRAC 40CNH2 CABINET PMRAC 40CNH2 NET PMRAC 40CNH2 TOP COVER PMRAC 50NH4 SIDE PLATE R PMRAC 50NH4 STRAINER PIPE PMRAC 50NH4 STRAINER COND PMRAC 40CNH2 SIDE PLATE L PMRAC 40CNH2 GRILL PMRAC 25NH4 EXPANSION VALVE 116 HITACHI RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A PM NO 0420E RAC 25NH5 RAC 35NH5 RAC 50NH5 Printed in Malaysia
54. 1 2K 5 1 10 R1104 5 1 10 A MO W R303 10K 5 1 10 A R621 10K 1 1 10 A R812 39 5 1 8 C B R1105 10K 5 1 10 A RESET R305 5 1 10 A R641 10K 5 1 10 C A R813 39 5 1 8 C R1106 1 5 1 4 A FLASH R306 5 1 10 A R642 10K 5 i 10 A R821 5 1 10 R1107 620 5 1 8 B 4 0 R307 5 1 10 A R643 10K 5 1 10 A R822 10K 1 1 10 C B R1108 2K 5 1 10 B A 1 5V R644 10K 5 mio a Ra23 1 1 10 Rios ik 5 A 5 401 390 5 1 10 A 88248 25 1 1 10 C B 81110 620 5 178 0v O a zi R402 390 5 1 10 A 46 1k 5 C R825 1 C 1111 2k 5 1 1 C B Bi R128 e R403 5 IK 5 hizio A 8647 1K 5 1 10 a 26 ik 5 1 10 R1112 560 5 1 10 B 0 R404 5 IK 5 A resi 1K 5 C R827 R652 100 5 110 R828 1 1 A st R656 10K 5 1 10 A R829 5 IK 5 1 10 A qs ae ASK Hr N HG PPP MOUNT MOUNT PRANSISTOR B25 50 3950K12 LA o A mmm MOL HF TYPE FORM Soc BYMBOLL o rrr Spe MODEL rom sor bwex O WIS
55. 18 33 C wireless remote controller E Set to ultra Hi when the compressor is running at maximum speed during hot dash or when 9 recovered from defrosting Judging operating mode change during operation Continuous judgment 16 1 a Conditions for judgment any of the followings temperature S The mode is reviewed at every interval time Med Operates at Med regardless of Same as at left Set to Med in modes other than when the Set to ultra Lo Lo Med or stop depending on the room temperature and time Set to When auto operation is started again before 1 hour has elapsed since the operation was stopped the room temperature compressor stops stop if the room temperature is 18 C in the ultra Lo mode other than during preheating b Judging method cooling is recovered at 18 33 C 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 Lo Operates at Lo regardless of the Same as at left Set to Lo in modes other than when the Set to ultra Lo Lo or stop depending on the room temperature and time Set to stop if and each type of shift value e g by remote controller preset temperature correction value powerful shift value etc room temperature compressor stops the room temperature is 18 C in the ultra Lo mode other than during preheating cooling is Current
56. 5 0 1 aw 2 C 3kQ 1 1609 1 100kQ 1 16W 1 C R6 R8 10kQ 1 16W 1 16W Symbol Specification bec Se Fo C1 F 16v F 2 22pF 50V 22pF 50V C4 1uF 16V F 2 31 CIRCUIT DIAGRAM MODEL RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A
57. 5 1 8 A R511 10K 5 1 10 A R661 10K 5 1 10 C B R902 82K 5 1 10 B a 5 d E S R RADIAL INSERT R115 560 5 1 8 A 8512 10K 5 5 A 8903 8 25k 1 B 24 a IN OUT 2 athe gt 5V e A AXIAL INSERT R117 68K 5 A R515 10K 5 C A R663 5 liio A R904 58 c exi x EY Y gt 5 5 R118 75K 2 A R664 5 8905 12 7k 1 V 2 gt i gt 0516 R119 6 98 1 1710 A R522 1K 5 1 10 C 665 1K 5 C B 8906 1K 1 B 5V XA 2P 2120 Not mount R531 10K 5 1 10 B O Ry BH R907 2 7K 5 B 6121 0 56 5 1 4 A 8532 1k 5 C B 5 A 1 ik 5 A XH 3P V2 8122 100 5 1 10 C A 8533 10K 5 1 10 B R912 47 5 sio A WHT E FLOAT SWITCH R123 33K 5 1 10 6 A R534 5 1 10 B R913 iK 5 174 B x 2 2 5 R124 100 5 1 10 C A R535 10K 5 1 10 B R72213 5 t 10 C B R914 1 5 1 4 C B ab 10801 M 3 R125 ARH Not mount R536 1k 5 1 10 B R741 110 5 C A R915 ik 5 1 4 et 821 EP 22 R126 Not mount 742 110 5
58. 8 5 1 ha 0906 1144148 AIM C605 0 001 50 HICJ1608 CN16 D907 RN3Z N HIM 0 R241 ve Hicheoe R906 039 5 2 606 0 001 50 C CNI7___ 0 175487 4 M 0908 49 6 ATM R242 R907 680 5 C607 0 001 50 C 1 175487 1 0909 4936 ATM R243 1 16 C HIC 608 R908 27 5 M 4 A M C608 0 047 25 C C 1608 0910 RK36 AIM R244 1 16 C HIC 608 R909 27 M 4 A M DIN A M R245 1 16 C HIC R910 62 59 2 A M D912 1184148 AIM R246 anel C HiCheos R9M 43K C801 05 50 F R M SW R247 R912 270 152 C802 0 022 50 i NORMAL R248 116 HiCh os R913 C803 0 01 2 lv R249 Hicheos R914 47K C804 0 01 D3SBAG0 HIM R250 R915 JUMPER A M C805 68 50 D R M PF POR R251 HiCheos R916 15K 806 0 5 50 MULTIPLEXER SELECTION 3 yy 3 R252 anel C 897 33 5 C807 0 01 M AS den R253 16 HICh os R918 1 M C808 0 01 2 LIE M R254 146 C HiCheos R919 3K 5 M C809 0 15 50 75 8 R290 R255 116 HiCh os R920 680 5 1 4 C810 PHOTOCGUPLERS 5 RB R291 R256 16 C Hicheos 8921 can 0 01 RAC SONHG ONLY qc R226 R257
59. 8CTR R535 1550906 R225 116 R709 Va CONNECTORS D205 HSM2838CTR HC R536 5y R226 1 16 C HIC R710 10K 596 1 41 M ILU 0206 HSM2838CTR R227 tej C HiCheos R711 C404 100 25 D R M VR 0 R228 116 C HIC 608 R712 MARK MODEL 0208 HSM2838CTR HIC SWITCHNG C909 35V EPROM ZZ R229 1 16 C HIC C404 100 25 D R M PF 0209 HSM2838C TR TRANS 19 Sel R230 146 C HIC 1608 C405 01 6 C C CN2 B2P3 VR R epa gt A R231 R801 39 5 14 A M C406 01 50 __ 857 238 H M He EPROM R232 Hicheos R802 39 CN8 _ B028 XASK N H 5702 N448 ____ 9 6 CN nem R233 anel C HiCheos R803 3K C408 01 B02B XAEK 1 M T P R234 146 C HIC BO2B XARK 1 M 6266 0 Q R235 1 16 HIC 1608 0 353297 5 0902 1N4148 AIM R236 Hicheos R901 200K 5 V2 A M C 01 0 00068 50 C C CN 2 B2P3 VH M 0903 RMPGOGG ATM RZE 5 12 R237 Hicheos R902 200K V2 A M C602 0 00068 50_ C C HIC CN 0 175487 5 M D904 RMPGO6G ATM R238 anel C Hicheos R903 820K 5 A M C603 00068 50 C C HIC 1 353797 0 M D905 4128 ATM pm R239 1 16 C R904 820K 596 1 2 M C604 _ 0 00068 50 C C HIC CN15 06
60. 9 59 3 20 4 68 8 16 14 3 58 3 21 0 69 1 INDICATION 22 9 73 7 28 4 83 1 24 22 3 72 7 29 0 84 1 INDICATION 30 9 88 1 36 4 97 7 32 Fan Motor Specifications MODEL RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A 59 3 58 3 73 7 72 7 88 1 87 1 30 3 87 1 37 0 98 8 RAC 25NH5 RAC 35NH5 50 5 POWER SOURCE 0 35V DC360V OUTPUT 20W 40W CONNECTION BLU BLUE GRY GRAY BLK BLACK YEL YELLOW BRN ORN ORANGE GRN PNK PINK VIO 27 BROWN WHT WHITE GREEN RED RED VIOLET COMPRESSOR MOTOR Compressor Motor Specifications MODEL RAC 25NH5 RAC 35NH5 50 5 COMPRESSOR MODEL JU1012D JU1013D PHASE SINGLE RATED VOLTAGE AC 220 240 V RATED FREQUENCY 50 Hz POLE NUMBER CONNECTION RESISTANCE VALUE Q WHITE RED YELLOW 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 color has been changed conspicuously replace the compressor 28 WIRING DIAGRAM MODEL RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A RAC 25NH5 RAC 35NH5 RAC 50NH5 BLU BLUE YEL YELLOW BRN BROWN WHT WHITE GRY GRA
61. AC 25CNH2 PROPELLER FAN PMRAC 25NH4 SUPPORT FAN MOTOR d PMRAC 40CNH2 FAN MOTOR 40W PMRAC 51CA1 CABINET co PMRAC 51CA1 NET W PMRAC 51CA1 TOP COVER W PMRAC 25NH4 SIDE PLATE R PMRAC 25NH4 STRAINER PMRAC 25NH4 STRAINER COND PMRAC 25NH4 SIDE PLATE R PMRAC 09CHA1 GRILL W PMRAC 25NH4 EXPANSION VALVE 114 MODEL RAC 35NH5 o PART NO RAC 35NH5 Q TY UNIT PARTS NAME PMRAC 25NH4 COMPRESSOR KPNT1 PUSH NUT RAC 2226H COMPRESSOR RUBBER PMRAC 25NH4 CONDENSER PMRAC 50YHA1 REVERSING VALVE PMRAC 25NH4 ELECTRICAL EXPANSION COIL PMRAC 25NH4 VALVE 2S PMRAC 25NH4 VALVE 3 O N PMRAC 40CNH2 THERMISTOR OH PMRAC 25NH4 OVERHEAT THERMISTOR SUPPORT PMRAC 25NH4 OVERLOAD RELAY COVER gt PMRAC 40CNH2 THERMISTOR DEFROST PMRAC 50YHA1 COIL REVERSING VALVE PMRAC 18SH4 REACTOR N PMRAC 35NH5 P W B MAIN e PMRAC 25NH4 SYSTEM POWER MODULE PMRAC 40CNH2 DIODE STACK D25VB60 n2 25 4 TERMINAL BOARD 4 W PMRAC 40CNH2 THERMISTOR OUTS
62. AKE SURE THE DC eDO NOT TOUCH ANY OTHER 2 a FAL TOSWICH FROW NTC o SISTER POWER MODULE VOLTAGE LEVEL AT PARTS EXCEPT THE SERVICE MEASURING POSITION SWITCH WHEN SERVICE R P AND IN IS LESS OPERATION IS CONDUCTED MEN DONI OR NS row Acces THAN 10V 5 TIMES LOWER LMT THe LOWER RPM LMT O TE VOLTAGE 5 EXTREMELY LOW OH THERMSTOR THERMISTOR IS OPERATING LEAK OF REFRIGERANT COMPRESSOR SELF OAGNOSS LIGHTING MODE LIT FA BLNKNG pm e naar dT ABNORMAL LIL SAF SHORTED CONNECTION OF THERMSTOR IS FAULTY DID Mil 7 5 lo THERHSTOR CRCUT NO ACCELERATION ABOVE THE LEAK OF REFRIGERANT 3 A b PETALS HECK NI ae LOWER LMT OF THE ROTATION b COMPRESSOR 1 2 L T I KD C D CABLE 15 REVERSED COMMINCATON COMMUNICATION BETWEEN DISCONNECTED f DOOR UNT AND OUTDOOR 1 DURING OPERATION 10305 LIGHTS H 9 TIMES ERROR UNT ARE INTERRUPTED ADEM POWER SUPPLY VOLTAGE 15 mcn EE 5 Bes are sn INSERTED 7 UTDOOR FAN RPM 15 NOT MOTOR OVERLOAD 0 s ZE ie ROTATE AS INTENDED RPM MOTOR CIRCUIT sg 3 EEPROM READING MICROCOMPUTER CANNOT p R e THS SHOWS READ THE DATA IN EEPROM 2 UNDER OVERLOAD CONDITION MALFUNCTION CINE COWERTER OVER VOLTAGE 15 DETECTED O SYSTEM POWER MODULE THE ROTATION SPEED 15 respec 8 SYSTEM POWER MODULE E CONTROLLED AUTOMATI
63. Aup AG 0 2 Bi se peeds uj eseud 10 JOjsisueJ y eAup si jeddouo AG 0 01 SI 9 1ndno 1ndino jeubls aseyd uoee si AS 0 Z Z ul uwous se 1 peeds 9 J Low speed High speed rotation mode wi Drive signal at point A Drive signal at point Fig 7 2 rotation mode 120 120 lt 120 120 LT l j Ww Drive signal at point Drive signal at point i Fig 7 3 75 8 HIC and Peripheral Circuits e Fig 8 1 shows the micro computer and its peripheral circuits Table
64. CALLY 07577 N ORDER PROTECT THE 3 EXAMPLE OF M 2 LIGHTS FOR 025 SEC COMPRESSOR BLINKING 5 TIMES Z AT INTERVAL OF 0 25 SEC a OW WIRING BLACK GRY GRAY COMPRESSOR TIOR BLU BLUE RED RED EMPERA LY n BRN BROWN WHT WHITE GRY HERMISTOR GRN GREEN YEL YELLOW 9 f ORY DEFROST we e HERMISTOR SERVICE COLLECT REFRIGERANT FROM INDOOR rower 00 Klan OPERATION UNIT AND STORE AT OUTDOOR UNT fis PROBE Z ANS REACTOR lt 10502 NB Ed NB 1 SWITCH OFF THE MAIN POWER SUPPLY AND THEN SWITCH IT ON AGAIN gt NB WAIT FOR 1 MINUTE p 5 NT Nt 2 PRESS AND HOLD THE SERVICE SWITCH FOR 1 SECOND TO START OUTDOOR ro V UNIT IN COOLING OPERATION IN ORDER TO PREVENT PARTS FROM DAMAGE Jo 20 2 DO NOT OPERATE THE OUTDOOR UNIT FOR MORE THAN 5 MINUTES DIODE GRY RED 3 PRESS AND HOLD THE SERVICE SWITCH FOR 1 SECOND TO STOP THE STACK SERVICE OPERATION 4 REPEAT STEP 1 TO 3 IF SERVICE OPERATION NEED TO BE REPEATED Ct ELECTRIC EXPANSION EASURING POSITION OF DC VOLTAGE Pf EASURING POSITION OF DC VOLTAGE M PWBs WIL ML 2 SYSTEM POWER MODULE HC al WR WR u ud REVERSNG VALVE 2 ap FUSE SURGE rh Asl AN P WB BK TN E i _ Bd THERE ARE SOME LEAD WIRES TERMINAL N 0 WHICH HAVE SPIRAL ST
65. DC 35V line via L801 and C802 of indoor interface circuit Fig 2 3 shows the voltages 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 62 e Fig 2 1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate with each other 5V R803 OPEN I IF transmit 1 D R804 500 C802 i 2 77 0801 MICROCOMPUTER R822 R824 R826 R829 cil ica P D821 R827 W IF receive VF OV 22 W agz R830 C824 input SDI me a e C8227 IC801 3 LO D101 r 8 7 B Y 7 OV OV ov ov o s 4 LLL D Terminal board Indoor P W B Outdoor P W B Hc ee S i m as EZ Quem Terminal board 35V A IF transmit oV output 00 3 4 1801 R801 C801 R802 Q801 1 AM C809 MICROCOMPUTER OV Interface 12V IF receive pe input SDI HJM OV 1 C807 nn C806 C810 C812 C808 NFCOIL2 OV ec L802 ia Communications from outdoor microcomputer to indoor microcomputer 6 Co
66. FERITE CORE 935 PMRAM 90QH5 TERMINAL BOARD 2P PMRAD 18NH7A REMOTE CONTROL ASSEMBLY PMRAMJ 250BW INSULATOR PIPE PMRAD 28MX INSULATOR PIPE 236L PMRAD 18NH7 UPPER PLATE 2 PMRAD 25QH4 UPPER PLATE 1 PMRAD 28QH1 FAN MOTOR SUPPORT PMRAD 25QH4 BASE FAN MOTOR PMRAD 18NH7 FILTER PMRAD 28MX DRAIN PIPE PMRAS5645TWU DRAIN CAP PMRAS 287AX UNION 2 PMRAS 287AX UNION 4 112 MODEL RAC 25NH5 z o PART NO RAC 25NH5 Q TY UNIT PARTS NAME PMRAC 25NH4 COMPRESSOR KPNT1 PUSH NUT RAC 2226H COMPRESSOR RUBBER PMRAC 25NH4 CONDENSER PMRAC 50YHA1 REVERSING VALVE PMRAC 25NH4 ELECTRICAL EXPANSION COIL PMRAC 25NH4 VALVE 2S PMRAC 25NH4 VALVE 38 O S PMRAC 40CNH2 THERMISTOR OH PMRAC 25NH4 OVERHEAT THERMISTOR SUPPORT PMRAC 25NH4 OVERLOAD RELAY COVER PMRAC 40CNH2 THERMISTOR DEFROST PMRAC 50YHA1 COIL REVERSING VALVE PMRAC 18SH4 REACTOR N PMRAC 25NH5 P W B MAIN e PMRAC 25NH4 SYSTEM POWER MODULE PMRAC 40CNH2 DIODE STACK D25VB60 PMRAC 25NH4 TERMINAL BOARD 4P W PMRAC 40CNH2 THERMISTOR OUTSIDE TEMPERATURE R PMR
67. G W ovova R288 5 R213 1 16 HiCheos R609 4 02K 1 B 6 C HiCheos C223 0 01 50 C C HcCheos 251214 17 001 12936 2 8 151g mM R 001 11 R214 1716 HiC eos R610 4 02K HiC eos C224 0 01 50 C C 0102 4148 AIM BTS lo 0 8 40907 0 ESD R215 ael C HiCheos ROM 4 02K h HiCh os C225 0 01 50 C Hicheos D103 114148 82 TS MTE 0209 50 R216 C HC C226 01 Hicheos 0706 D104 114148 ATM gt Pmj ES E R217 1 16 C HIC C227 2200p 50 C C HiCHeo8 0105 1144148 AIM 95 D 7 3 t R5 gt P R283 0507 R218 1716 HiC eos R701 75K 5 1 2 A M D106 RED NF COIL NF COL3 R219 Hicheos R702 10K M 0801 250121477 R TERMINAL 1803 800 70 3 R220 HiCheos R703 470 Gor 01 C R221 146 C C302 07 16 C C D201 HSM2838CTR 0 RL R222 1 16 C R706 10k_ 5 1 4 A M C303 01 16 C C chos 0202 HSM2836CTL ov pei R534 R525 0505 R223 116 HiC eos R707 10K 6 C304 01 16 C C HICh608 D203 HSM2836CTL C HIC 0203 LH R526 R224 1 46 C HiCheos R708 C305 01 16 C C HICJ o8 0204 HSM283
68. IDE TEMPERATURE R PMRAC 25CNH2 PROPELLER FAN PMRAC 25NH4 SUPPORT FAN MOTOR PMRAC 40CNH2 FAN MOTOR 40W PMRAC 51CA1 CABINET PMRAC 51CA1 NET W PMRAC 51CA1 TOP COVER PMRAC 25NH4 SIDE PLATE R 25 4 STRAINER W PMRAC 25NH4 STRAINER COND PMRAC 25NH4 SIDE PLATE R PMRAC 09CHA1 GRILL W PMRAC 25NH4 EXPANSION VALVE 115 MODEL RAC 50NH5 PART NO RAC 50NH5 Q TY UNIT PARTS NAME PMRAC 50NH4 COMPRESSOR KPNT1 PUSH NUT RAC 2226HV COMPRESSOR RUBBER PMRAC 50NH4 CONDENSER PMRAC 50YHA1 REVERSING VALVE PMRAC 25NH4 ELECTRICAL EXPANSION COIL PMRAC 50NH4 VALVE 2S PMRAC 50NH4 VALVE 4S PMRAC 40CNH2 THERMISTOR OH PMRAC 25NH4 OVERHEAT THERMISTOR SUPPORT PMRAC 25NH4 OVERLOAD RELAY COVER PMRAC 40CNH2 THERMISTOR DEFROST PMRAC 50YHA1 COIL REVERSING VALVE PMRAC 18SH4 REACTOR PMRAC 50YH5 P W B MAIN PMRAC 40CNH2 SYSTEM POWER MODULE PMRAC 40CNH2 DIODE STACK D25VB60 PMRAC 25NH4 TERMINAL BOARD 4P PMRAC 19SH4 THERMISTOR OUTSIDE TEMPERATURE PMRAC 40CNH2 PROPELLER FAN PMRAC 40CNH2 SUPPORT FAN MOTOR PMRAC 4
69. IT P aa SINGLE ENDED 3 1 UNION 1 2 012 7 HT s E SUCTION 12 7 28 0 S TANK 5 d REVERSING 2 VALVE UY q 227 B M ZZ I PU Q mS Om 0 66 35 912 7 gt 24 1 lt 06 35 NS Sy ELECTRIC A EXPANSION VALVE U SERVICE VALVE SL iy 1 4 06 35 STRAINER 2 2 26 35 SINGLE ENDED 09 0 STRAINER 54 1 Receiver Circuit 5V R419 AV rs Wireless input R611 2 Light receiving O e 43 unit 4 T q een Microcomputer V 7 C405 V ov Fig 1 1 e The light receiver unit receives the infrared signal from the wireless remote control option part The receiver amplifies and shapes the signal and outputs it 2 Buzzer Circuit Microcomputer Buzzer output 30 gt W lt 0722 asisas l Fig 2 1 Buzzer Circuit e When the buzzer sounds an approx 3 9kHz square signal is output from buzzer output pin Go of the microcomputer After the amplitude of this signal has been set to 12Vp p by a transistor it is applied to the buzzer The piezoelectric element in the buzzer oscillates to generate the buzzer s sound Metal diaphragm Pizoelectric element VLLLL LL A
70. O06 1 R311 10K m HiCheos 004 LTD67A c Hc RED 1004 1AX03615 03171 M 8 6 VH 2p R007 100 6 R32 100 5 6 C HiCheoe 005 p JAFUSE R008 100 5 10 H BENT C006 4 koo F H M L801 T002 HIM PED luy o 7 B R010 C007 0 01 RAC 5ONH4 ONLY 1802 _ FBAO4MAZ50__ A M ROT R401 00 5 M C008 0 01 RAC 5ONH4 ONLY 1803 CM204 A M mS 19 ei C009 01150 ZENER_DIODES 804 CM137 ATM I A R002 F101 100 ps0 DRIM 21 QW 000 007 RMT TAM con 400 250__ D MARK MODEL 582 1901 BLOTRNT A M 5 R102 0 01 FA 1902 JUMPER ATM 72 R103 14 ATM R501 xw HiCheos 001 CRIM 1903 JUMPER AIM 05 0 3 008 R104 R502 6 HiCheos Cot4 0 01 C R M I R105 M R503 HiCheos 005 001 c RIM PCN01906 03161 H M 4 R106 R504 5 6 HZ12CPTK 1 TMHA010 HIM R107 2 M R505 5 716 C HZ12CPTK R108 1 R506 5 H 16 C Hicheos C101 0 082 630 FH BV R507 54K 5 8 C102 OSCILLATOR 11 RTZ M R508 5 1K 5 8 HC526 003 07 50 CIRM g Iz F R13 M R509 5 1K 5 C004 1000 50 C R M lt g Jon RTZ IA M R50 5K 6
71. R920 C918 w 4 C908 L 1 i T Y 8 5 0906 3 PQ g je 2 ce C924 3 38 R922 i Fig 4 1 Power circuit for P W B ine oV e In the power circuit for P W B power supply for microcomputer peripheral circuits and system power module driver circuit and as well as DC 35V are produced by switching power circuit e Switching power circuit performs voltage conversion effectively by switching transistor IC901 to convert DC 330V voltage to high frequency of about 20kHz to 200kHz e Transistor IC901 operates as follows 1 Shifting from OFF to ON e DC about 330V is applied from smoothing capacitors C010 and C011 in the control power circuit With this power current flows to pin of IC901 R903 and R904 and IC901 starts to tum ON Since voltage in the direction of arrow generates at point at the same time current passing through R910 and D903 is positive fed back to IC901 70 2 During ON e The drain current at IC901 increases linearly During this period the gate voltage and current become constant because of the saturation characteristics of the transformer 3 Shifting from ON to OFF e This circuit applies a negative feedback signal from the 12V output When the voltage across C919 reaches the specified value REG2 turns and current flows to PQ2 1 0 This turns the secondary circuits on sets IC901 pin to Hi and turns IC901 off 4 During OFF e While 901 is on
72. RAD 18NH7A RAD 25NH7A RAC 25NH5 HITACHI RAD 35NH7A RAC 35NH5 RAD 50NH7A RAC 50NH5 SERVICE MANUAL TECHNICAL INFORMATION FOR SERVICE PERSONNEL ONLY REFER TO THE FOUNDATION MANUAL CONTENTS SPECIFICATIONS TTTTTYTqT 4 HOW TO USE nennen 6 CONSTRUCTION AND DIMENSIONAL DIAGRAM 24 MAIN PARTS COMPONENT 27 WIRING DIAGRAM YT en nnn 29 CIRCUIT DIAGRAM YY tne 31 een BLOCK DIAGRAM nnn 37 RAD 35NH7A BASIC MODE 39 RAD 50NH7A REFRIGERATING CYCLE DIAGRAM m 53 DESCRIPTION OF MAIN CIRCUIT OPERATION 55 Al SERVICE CALL Q amp 87 TROUBLE SHOOTING 90 PARTS LIST AND DIAGRAM Y 108 RAC 25NH5 RAC 35NH5 RAC 50NH5 SPECIFICATIONS DC INVERTER DUCT TYPE INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT RAD 25NH7A RAC 25NH5 RAD 35NH7A RAC 35NH5 TYPE INDOOR UNIT OUTDOOR UNIT RAD 50NH7A RAC 50NH5 INDOOR UNIT RAD 18NH7A MODEL POWER SOURCE 1 PHASE 50 Hz 220 240V 1 PHASE 50 Hz 220 240V 1 PHASE 50 Hz 220 240V 1 PHASE 50 Hz 220 240V TOTAL INPUT W 560 155 850 695 155 1 050 1 240 155 1 280 2 000 155 2 060 TOTAL AMPERES A 2 56 2
73. RIPES 1 OARD 4 WITH WHITE IN ADDITION TO SERVICE SWITCH T l THE ORIGINAL COLOR Jen wm fem SCREW DANGER OF ELECTRIC SHOCK CONNECTING CORD 92 CHECKING THE INDOOR OUTDOOR UNIT ELECTRICAL PARTS AND REFRIGERATING CYCLE Model RAC 25NH5 RAC 35NH5 RAC 50NH5 Unit does not operate Yes Open electrical cover of indoor unit Timer lamp ES See Troubleshooting when the timer lamp Does the timer lamp on the indoor unit blink blinks Refer page 92 No Remove the terminal cover and check the voltage Set to room temperature 16 C in the cooling between terminal and terminal D mode or to 32 C in the heating mode and press the start stop button Is approx DC 33 to 37V being generated Is the polarity correct No Yes Does the operation lamp on the indoor unit gt ligh link start to light or blin Yes Is the compressor in the outdoor unit operating Yes No Remove the outdoor unit cover and electrical parts cover and check self diagnosis lamp LD301 fo h F 5
74. RSA Med a Outdoor temperature 2 27 C Restricted to cooling Division 3 Md I b Outdoor temperature 16 C Restricted to heating Division 4 Med se 27 66 2 Judging by room temperature Compressar stopped 1 The indoor fan also stops when the Operating mode at start up is judged initial judgment for minutos compressor is in stop status Conditions for judgment any of the followings 1 Runs at Hi until first thermo to auto When auto operation is started after 1 hour has elapsed since the operation was stopped im off after operation is started Med When auto operation is started after the previous manual mode operation S 2 Runs at Lo when thermo is Lo When the operating mode is switched to auto while operating at manual mode je off b Judging method 8 Room temperature 25 3 C Cooling pan Hi Operates at Hi regardless of the Set to ultra Hi when the Set to Hi in modes other than when the Set to ultra Lo Lo Med Hi ultra Hi or stop depending on the room temperature and Room temperature lt 25 3 Heating Cooling o room temperature compressor runs at maximum compressor stops time Set to stop if the room temperature is 18 in the ultra Lo mode other than during 3 C is the fine adjustment value from the 25 C 8 speed and to in other modes preheating cooling is recovered at
75. SI 91941 eq 0160 pue 06 SOA eal t LGH SsoJoe jndino ASE Od SI ON JInouno eui Y29049 Jo speura AOL 15281 12 S Ke i JO 109 epis eui SI 105 W eoenelu SOA 1ndino si AG 86 66 pue 9 ye AGE SI 1018 9 OWI 6 S UII 10601 99 pue YD8U9 eui S sued 24 Jojsiueu eui EJEWIOU 10451 Jo y S 24 Buloises eq ue qoud eu EWIOUQE JOJSIUWJBU pe19euuoosip Z S UIq 10207 J0j2euuoo eui S eui JOBUUOD 100 pue peel jo y99uO sued Aue eoejda
76. Y ORN ORANGE GRN GREEN RED RED OUTDOOR UNIT BLK BLACK PNK PINK 719 VIOLET COMPRESSOR DV WHT YEL REO UVW CONNECTING TERMINAL HEAT SE EXCHANGER THERMISTOR ROOM TEMP THERMISTOR TERNAL O BRN RED a E 25 x ECH BLK AC 220 240V 50Hz GRNAYELI FAN MOTOR DRAIN M PUMP MOTOR N WIRELESS LIGHT 7 REMOTE CONTROL 5 GRN YEL 00000000 0000 12345678 1234 C1 M2 JN WHT 29 CIRCUIT DIAGRAM Wired Remote Control LCD oe Xe X7 Xe XS X4 XSX2X0 Pr Ga 56955352559 o O 12V RED R1 For Wired SEG8 O Wired output SEG15 2 vas 3 5 5 2 P21 SEG17 BR 1X2 OV BLACK For Wired 1 M34552G8HFP OTPMICON 34552 4 116 MASKMICON Symbol Specification LCD LCD S3WA H 0 pecification For B425D enner diode ZD1 2 3 Capacitor 7 100uF 63V vV 2 3 2 3 N 97 3 2 3 I E 3 ip ransistor Symbol Specification Form Q1 25015285 Size of Resistor and C Capacitor 3 3216 Size 2 2125 Size 1 1608 Size Resonators Symbol Specification C RO02RX 32 768kHz CSTCC3 64MGOH6 3 64MHz Resistor Specification Size 1
77. a is cleared Compressor speed DFTIM3 DFTIM1 Outdoor temperature Notes 1 The first inhibit time after operation start is set to DFTIM1 2 From the second time onwards the inhibit time is set according to the time required for defrosting Reverse cycle operation time gt DEFCOL DFTIM1 is set Reverse cycle operation time DEFCOL The time corresponding to outdoor tempera ture is set 51 REFRIGERATING CYCLE DIAGRAM MODEL RAD 18NH7A RAD 25NH7A RAC 25NH5 RAD 35NH7A RAC 35NH5 COOLING DEHUMIDIFYING DEFROSTING OUTDOOR UNIT 09 52 OMPRESSOR C REVERSING I ELECTRIC EXPANSION VALVE SERVICE VALVE 3 8 INDOOR UNIT SINGLE ENDED UNION 3 8 10 A 99 012 7 645 52 96 35 SERVICE VALVE 1 4 06 35 012 7 06 35 f SINGLE ENDED TRAINER UNION 1 4 S 96 35 RAINER 15 CHARGING PIPE HEATING OUTDOOR UNIT SERVICE VALVE INDOOR UNIT 09 52 38 SINGLE ENDED 1 UNION 3 8 CH 9 0 SUCTION Q
78. ation speed programmed in the microcomputer software with the DC current value Microcomputer ction resistor O To power module 1 5 negative terminal OVL judgement oY with respect to Motor control externally set process Q R24 1 value Judgement OVL according to the rotation speed A D converter Voltage amp circuit Internal judgement Rotation speed data Selects data according to the rotation speed and DC voltage OVL start current data Fig 8 4 Overload Control System Configuration A D DC voltage converter DC current Judgement value according to the rotation speed internal judgement value Rotation speed Fig 8 5 1 Overload external judgement circuit e Fig 8 1 The filter consisting of R245 and C217 removes high harmonic components from the voltage generated by the current flowing to Detection resistor R245 and C217 average the voltage This voltage is then input to IC4 pin 5 is then amplified and supplied to microcomputer pin 69 The microcomputer compares this input with the internally set value and if the input exceeds the set value it enters overload control status e Fig 8 7 shows the rotation speed control When the voltage at pin 60 of the microcomputer exceeds the set value the microcomputer decreases the rotation speed of the compressor and reduces the load regardless of the r
79. c Upper arm transistor ON Current at Fig 3 3 Voltage waveform at each point e When power is supplied Ut U7 because of that Ut is chopped current flows as shown below 1 When Ut transistor is ON Ut transistor U coil V coil V transistor DC current detection resistor Point Fig 3 1 2 When Ut transistor is OFF by inductance of motor coil U coil V coil V transistor Return diode Point Fig 3 4 68 260V 360V DC current Id detection resistor System Power Module 2 Fig 3 4 Power module circuit U is ON is ON DC compressor motor e Since current flows at point 6 only when U transistor is ON the current waveform at point 6 becomes intermittent waveform as shown in Fig 3 3 Since current at point is approximately 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 detective self diagnosis lamps on the control P W B may indicate as shown below 7 oi AN Hee 5 O 2 Self diagnosis lamps P W B Main LD303 302 301 Fig 3 5 Table 3 1 Self diagnosis Self diagnosis lamp and mode Ip peak current cut LD301 Blinks 2 times Abnormal low speed rotation LD301 Blink
80. circuit together with the peripheral elements e 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 e The set Value is determined by the amplification of the voltage amp circuit e Amplification high DC current low e Amplification low DC current high 270 e R500 R253 detect the DC voltage at the power circuit The microcomputer receives a DC voltage 260 380V HIC G and applies correction to the overload set value so the DC current is low high when the DC voltage is high low 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 Amplification low DC voltage low DC current high Amplification 8 5 times DC voltage 260V 8 Amplification high DC voltage high DC current low G Rotation speed Fig 8 8 lt During start current control gt It is required to maintain the start current DC current constant to smooth the start of the DC motor for the compressor RAC 25NH5 RAC 35NH5 RAC 50NH5 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 transisto
81. cuit detects an instantaneous excessive current and stops inverter to protect parts such as SPM2 etc e As shown in diagram if current exceeding 21A 27A for 50 5 flows voltage at point recognized by detecting resistor is input to of SPM2 HIC and voltage divided by R41 and R43 is input to pin 9 of IC1 Since threshold of IC1 is exceeded in this case Lo signal is input from pin 8 Voltage at point When Lo signal is input to of microcomputer microcomputer stops drive output e When drive output from microcomputer is stopped all drive output goes Hi and microcomputer is initialized to enter drive signal standby mode 3 minutes later microcomputer outputs drive signal again to start operation 77 2 Overload control circuit OVL control circuit e 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 e Fig 8 4 shows the overload control system configuration and Fig 8 5 is a characteristic diagram of overload judgement values There are two judgement methods external judgement which compares the externally set value with the DC current value regardless of the rotation speed and internal judgement which compares the set value that varies according to the rot
82. door unit e Communication signal from outdoor microcomputer to indoor microcomputer At first outdoor microcomputer will send a request signal SDO to indoor microcomputer A high frequency IF signal approx 38 KHz is generated and modulated by the request signal SDO inside the outdoor microcomputer then output to pin 43 of microcomputer This modulated IF signal is output to pin 60 of HIC and amplified by amp 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 9 of the indoor microcomputer Fig 2 2 shows the voltages at each component when data is transferred from the outdoor microcomputer to the indoor microcomputer e Communication signal from indoor microcomputer to outdoor microcomputer The request signal SDO generates by indoor microcomputer is output to pin 60 and amplifies by C801 IF signal approx 38 kHz is generated by comparator then modulate by the request signal from pin 60 of indoor microprocessor This modulated IF signal is then amplified and superimposed to
83. ds to the Self Fine Simes Aimes 5 times Slime Btimes power module again and operate the gt gt air conditioner LD301 Within Time until the Approx Approx lamp lights 5 ab seconds Possible malfunctioning Compressor part Is the self diagnosis lamp mode as Blinking shown on the right mpressor Gas c leakage 9 YES Normal 0 39 0 98 MPaG 4 10 kg cm G Stop to operate and check gas pressure in balancing mode Gas leaking less than 4kg cm G When the less than 0 39 MPaG 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 Checking the system power module Perform a final check of operation 104 HOW TO OPERATE USING THE SERVICE SWITCH THE OUTDOOR UNIT MODEL RAC 25NH5 RAC 35NH5 RAC 50NH5 1 Turn off the power supply to outdoor unit and then turn on again 2 Remove the electrical box cover 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 Service switch forced cooling mode is set by pressing for 1 second or more and stopped by pressing again Electrical Box Cover RAC 25NH5 RAC 35NH5
84. e This smoothes averages the voltage rectified by the diode e When inrush protective resistor is stack2 A DC voltage is generated in the same way as in defective diode stack may Fig 1 3 malfunction As a result DC voltage Voltage between side of C010 and side of C011 is about is not generated and no operation can 330V be done b C001 to C012 to C015 C007 C008 NF COIL1 COIL absorb electrical noise generated during operation of compressor and also absorb external noise entering from power line to protect electronic parts 6 Surge absorber Varistor 1 2 3 absorbs external power surge 7 Inrush protective resistor R007 R008 This works to protect from overcurrent when power is turned on 64 4 2 Indoor Outdoor Interface Circuit e The interface circuit superimposes an interface signal the DC 35V line supplied from the outdoor unit to perform communications between indoor and outdoor units This circuit consists of a transmiting circuit which superimposes an interface signal transmit from the microcomputer on the DC 35V line and a transmiting circuit which detects the interface signal on the DC 35V line and outputs it to the microcomputer e Communications are performed by mutually transmiting and receiving the 4 frame outdoor request signal one frame of which consists of a leader of approx 100 ms start bit 8 bit data and stop bit and the command signal with the same format transmit from the in
85. emperature 5 Outside temperature 3 21345670 Outside temperature 4 Outside temperature 2 1 Outside temperature 1 Outside temperature 0 LSB Compressor ON Reversing valve 2 way valve 2134 56 70 Fan 2 MSB 1 Fan 1 Fan 0 LSB Self diagnosis 3 MSB Self diagnosis 2 Self diagnosis 1 Self diagnosis 0 LSB Defrost request signal 2345670 During forced operation 1 0 Multi bit 1 0 O 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 0 170 1 01 0 1 011 01 0 11 0 Capacity code 3 MSB Capacity code 2 Capacity code 1 Capacity code 0 LSB Indoor in operation bit 213456700 Operation mode 2 MSB 1 Operation mode 1 0 Operation mode 0 LSB 1 0 1 0 1 0 1 0 O O O O 1 0 1 0 1 0 0 1 0 O O 1 0 1 0 1 0 1 09 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 Character No Contents Data 66 2 Indoor message Character No Contents Data 109 JO OW 105591909 od ircui 3 Power Module C 0 0 9 NO NO S N L E 614 09 eulwie 19414 N 1 as 2 iw uono loid juauno 8004 O 2009 I
86. entrance of J Do Not Forget To Clean The Air Filter Dusty air filter will reduce the air volume and the cooling efficiency To prevent from wasting electric energy please clean the filter every 2 weeks It is possible to reduce heat entering the room through windows Install curtain or blinds gt At night please use the OFF or ON timer operation mode together with your wake up time in the morning This will enable you to enjoy a comfortable room temperature Please use the timer effectively Effective Usage Of Timer 19 Please Adjust Suitable Temperature For Baby And Children Please pay attention to the room temperature and air flow direction when operating the unit for baby children and old folks who have difficulty in movement Sl FOR USER S INFORMATION The Air Conditioner And The Heat Source The Room A Caution If the amount of heat in the room is above the cooling capability of the air conditioner for example more people entering the room using heating equipments and etc the preset room temperature cannot be achieved Not Operating For A Long Time When the indoor unit is not to be used for a long er period of time please switch off the power from the 4 mains If the power from mains remains the sw R indoor unit still consumes about 8W in the operation 2 control circuit eve
87. er of dy lt cooling heating or dehumidifying mode in indoor units to be operated We M the room the sound of refrigerant flow may especially when it is very x be heard from stopped indoor unit or a hot or cold or when you stopped indoor unit may become warm want to reach the present This is because the indoor unit returns temperature quickly 97 refrigerant to the outdoor unit to be ready for operation 2 Ne NAMES AND FUNCTIONS OF EACH PART INDOOR UNIT Air outlet Filter Air inlet MODEL NAME AND DIMENSIONS Electrical box Wired Remote controller MODEL WIDTH mm HEIGHT mm DEPTH mm 8NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A 750 235 400 NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT This controls the operation function and timer setting of the room air conditioner START STOP Button Press this button to start operation Press it again to stop operation FUNCTION Button Use this button to select the operating mode Every time you press it the mode will change from AUTO to HEAT to DEHUMIDIFY and to COOL cyclically SLEEP Button Use this button to set the sleep timer r Page 16 Reserve Button Timer setting reservation OFF TIMER Button Select the turn OFF time ON TIMER Button Select the turn ON time
88. er than CLMXTP When fan is set to compressor rpm will be limited to CKYMAX TY1 When fan is set to Med compressor rpm will be limited to CJKMAX When fan is set to Lo compressor rpm will be limited to CBEMAX During Cool Dashed when room temperature reaches set temperature 1 C compressor rpm is actual rom x DWNRATEC 43 Cooling Defrost TEIOF TEION Cooling defrost signal temperature Hi Indoor fan See basic operation See basic operation gt Outdoor fan 15sec Lo Lo Reversing valve heating on mode Compressor speed Balance period 3min Cooling Sleep Operation Final set temperature Cooling dehumidifying set temperature sleep shift Example 2 25 C or more after 6 shifts Example 1 Limited to 28 C T Example 3 25 C is not reached after 6 shifts 28 C shift upper limit Cooling dehumidifying set 2 5hr temperature Remote control set temperature SHIFTC Set to 7 hours Sleep key Operation lamp Timer lamp Indoor fan Hi M 599 basic operation Lo sleep Outdoor fan Lo 1 Horizontal air spy deflector Horizontal Facing down Maximum speed Compressor speed Notes 1 The sleep operation starts when the sleep key is pressed 2 When the sleep key is set the maximum compressor speed is limited and the indoor fan is set to
89. ere is too much dust use neutral detergent After using neutral detergent wash with clean water and dry in the shade Filter Indoor unit 3 Install the filters Gently insert back the filter into the holders A CAUTION e Do not wash with hot water at more than 40 C The filter may shrink e When washing it shake off moisture completely and dry it in the shade do not expose it directly to the sun The filter may shrink e Do not operate the air conditioner with the filter removed Dust may enter the air conditioner and cause trouble 21 REGULAR INSPECTION PLEASE CHECK THE FOLLOWING POINTS BY QUALIFIED SERVICE PERSONAL EITHER EVERY HALF YEARLY OR YEARLY CONTACT YOUR SALES AGENT OR SERVICE SHOP 1 Is the earth line disconnected or broken Is the mounting frame seriously affected by rust and is the 2 outdoor unit tilted or unstable 3 Is the plug of power line firmly plugged into the socket Please ensure no loose contact between them AFTER SALE SERVICE AND WARRANTY WHEN ASKING FOR SERVICE CHECK THE FOLLOWING POINTS CONDITION CHECK THE FOLLOWING POINTS e Is the fuse all right When it does not operate e the voltage extremely high or low e ls the circuit breaker ON e Was the air filter cleaned e Does sunlight fall directly on the outdoor unit
90. erve button OFF TIMER reserved with a signal received sound beep e The OFF Mark starts lighting instead of blinking ON TIME setting e Select the ON TIMER by pressing the ON Button e At the beginning of setting time 6 hours was set e Setting time will change according to the below sequence 0 5 hour interval 0 551 051 55 49 5 710 X 112 1 The value change quicker if you keep pressing the button 1 hour interval Press the D Reserve button e ON TIMER reserved with a signal received sound beep e The 1 ON Mark starts lighting instead of blinking CANCELLATION of Timer Reservation Press the Cancel button e As the time settings are stored in remote controller memory you only have to press the Reserve button in order to use the same setting next time 15 Operation stop at setting time 3t O J _IHr 53503 A Cz 6 0 HITACHI Operation will temperature at setting time The starting time may different depend on the room temperature and set temperature start for setting 5503 A Cs c CEJ HITACHI
91. es prohibition 9 Indicates the instructions that must be followed e Please keep this manual after reading PRECAUTIONS DURING INSTALLATION e Do not reconstruct the unit Water leakage fault short circuit or fire may occur if you reconstruct the unit by yourself A e Please ask your sales agent or qualified technician for the installation of your unit Water leakage short circuit or fire may occur if you install the unit WARNING by yourself e Please use earth line Do not place the earth line near water or gas pipes lightning conductor or the earth line of telephone Improper installation of earth line may cause electric shock e A circuit breaker should be installed depending on the mounting site of the A unit Without a circuit breaker the danger of electric shock exists e Do not install near location where there is flammable gas The outdoor unit CAUTION may catch fire if flammable gas leaks around it e Please ensure smooth flow of water when installing the drain hose e Should abnormal situation arises like burning smell please stop operating the unit and turn off the circuit breaker Contact your agent Fault short circuit or fire may occur if you continue to operate the unit under abnormal situation e Please contact your agent for maintenance Improper self maintenance may cause electric shock and fire e Please contact your agent if you need to remove and reinstall the un
92. eset time has been reached Does Nice temperature reservation It does not work It works only during cooling function operate during dehumidifying and heating This is because Nice temperature reservation function is operating The start time varies according to the load of room Since load varies greatly during heating the operation start time is corrected so it will vary each day Even if the same time is preset the operation start time varies Has the clock been set Timer cannot be set unless the clock has been set The current time display The current time disappears When the current time is disappears soon in approx 10 seconds The set the display flashes for time set display has priority approx 3 minutes The timer has been programmed Is the current time past the preset time but the preset time disappears When the preset time reaches the current time it disappears 87 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 This is because the cool wind prevention function is operating and does not indicate a fault 88 The heat
93. frigerant of 300g after vacuuming gt 1 Do not operate for more than 5 The operation method is the same as How to operate using the connector to servicing the outdoor unit 1 The charging amount of 300g is equivalent to the load in normal operation 105 SYSTEM POWER MODULE DIAGNOSIS Circuit diagram of O Collector the device excepting the e reflux diode BASE 9 Emitter o e e Circuit diagram of the module PGUO 00 O WO NGUO NGVO NGWO N1 P2 U mark of the module o rh X See next page for measuring value using tester 1 Terminals symbol lt lt jm 2 Bac 12 11 106 HOW TO CHECK SYSTEM POWER MODULE Checking system power module using tester Set tester to resistance range X 100 If indicator does not swing in the following conductivity check the system power module is normal In case of digital tester since built in battery is set in reverse direction and terminals are reversed Z CAUTION If inner circuit of system power module is disconnected open the indicator of tester will not swing and this may assumed as normal In this case if indicator swings when and terminals
94. he 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 be placed about the location of installation O 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
95. in Reversing valve heating on mode Room temperature ATCMAX Ultra Hi Indoor fan Operation lamp Rating Compressor rotation speed Note 1 See the data in Table 1 on page 43 for each constant in capital letters in the diagrams Notes 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 7 larger than WMAX Cool Dashed will release when i a maximum 25 minutes is lapsed and ii room temperature is lower than set temperature 3 C thermo off and iii when room temperature has achieved setting temperature 1 C then maximum Cool Dashed time will be revised to 20 minutes And iv indoor fan is set to Lo and Med fan mode and v change operation mode During Cool Dashed operation thermo off temperature is set temperature with shift value 3 C After thermo off operation continue in Fuzzy control mode Compressor minimum ON time and OFF time is 3 minutes During normal cooling mode compressor maximum rpm CMAX will maintain for 60 minutes if indoor temperature is lower than CLMXTP No time constrain if indoor temperature is high
96. ing a grounding wire Metal plate of aluminium stainless steel etc Working table Resistor of 1 MQ 1 2W Staple le 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 high insulation mode 100V 10MQ or higher when ordinary iron is to be used 7 In checking circuits for maintenance inspection or some others be careful not to have the test probes of the measuring instrument shortcircuit a load circuit or the like A CAUTION 1 n 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 preventing 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 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
97. it Electric shock or fire may occur if you remove and reinstall the unit yourself improperly e If the supply cord is damaged it must be replaced by the special cord obtainable at authorized service parts centers PRECAUTIONS DURING OPERATION e Avoid an extended period of direct air flow for your health e Do not insert a finger a rod or other objects into the air outlet or inlet As the fan is rotating at a high speed it will cause injury Before cleaning be sure to stop the operation and turn the breaker OFF e Do not use any conductor as fuse wire this could cause fatal accident QZ ZNWPE gt Q 8 e During thunder storm disconnect and turn off the circuit breaker PRECAUTIONS DURING OPERATION e The product shall be operated under the manufacturer specification and not for any other intended use AN e Do not attempt to operate the unit with wet hands this could cause fatal CNY accident 2792 NNI e When operating the unit with burning equipments regularly ventilate the _ room to avoid oxygen insufficiency Do not direct the cool air coming out from the air conditioner panel to face household heating apparatus as this may affect the working of apparatus such as the electric kettle oven etc e Please ensure that outdoor mounting frame is always stable firm and without defect If not the outdoor unit may collapse and cause danger e Do not splash or direct wa
98. ll be activated and will stop operation if the drain pump is faulty or drain hose is stopped up disabling drainage causing the drain level to rise abnormally e When the float switch is activated the timer indicator will flash six times Note that the float switch will also be activated disabling operation if the connector of float switch has defective contact or is connected incompletely 58 10 High static pressure switch Full duct type and semi duct type Main P W B r il CL 6 1 8 p 108 3 2 h g Y999100022 Wa 0 Static pressure sw Normal High Drain pump test drive sw Fig 10 1 e For full duct type and semi duct type set the high to HIGH STATIC PRESSURE e f not set to HIGH there will be reduction of cooling and heating capacities 11 Wired remote control receiver circuit 5 V 12V A i Tal 01102 EB gt 2 PH 4P Wired input R1109 cc um T WHT f 13 E 4 4 Microcomputer Y Wired remote SK control ler e c ge e In wired remote control receiver circuit the signal will transmit to micro computer 3 by using photocoupler PC101
99. ll become warm quickly But you may feel a chill at the beginning MED Fan speed slow LOW Fan speed slower 6 6 HITACHI Dr Dn SILENT Fan speed ultra slower Set the desired room temperature with the TEMPERATURE buttons the display indicates the setting The temperature setting and the actual room temperature may vary somewhat depending on conditions lt Press the 0 START STOP button Heating operation starts with a beep Press the button again to stop operation As the settings are stored in memory in the remote controller you only 0 have to press the D START STOP button next time HITACHI 12 DEHUMIDIFYING OPERATION Use the device for dehumidifying when the room temperature is over 16 C When it is under 15 C the dehumidifying function will not work a E 1 Press the FUNCTION selector so that the display indicates DEHUMIDIFY The FAN SPEED is set at LOW or SILENT Set the desired room temperature with the TEMPERATURE button the display indicates the setting 2 og The range of 20 26 C is recommended as the room temperature for dehumidifying o 4 HITACHI START Press
100. ly When you switch on the circuit breaker the operation will be automatically restarted with previous operation mode Note 1 If you do not require Auto Restart Control please consult your sales agent or OFF by remote control 2 Auto Restart Control is not available when Timer or Sleep Timer mode is set AUTOMATIC OPERATION The device will automatically determine the mode of operation HEAT COOL or DEHUMIDIFY depending on the current room temperature The selected mode of operation will change when the room temperature varies A N Press the FUNCTION selector so that the display indicates the AUTO mode of operation When AUTO has been selected the device will automatically determine 1 the mode of operation HEAT COOL DEHUMIDIFY depending the current room temperature However the mode of operation will not change when indoor unit connected to multi type outdoor unit f the mode automatically selected by the unit is not satisfactory manually change the mode setting heat dehumidify cool or fan START Press the START STOP button Operation starts with a beep N STOP Press the button again to stop operation P the settings are stored in memory in the remote controller you only have to press the 1 START STOP button next time lt Whe
101. ly cooling recovered at 18 33 C The fan speed is controlled by the heat exchanger temperature the Room temperature Final preset temperature 3 C Change to heating overload control is executed as in the following diagram Room temperature gt Final preset temperature 3 C Continue cooling Heat exchanger temperature Currently heating AEON Room temperature Final preset temperature 2 C Change to cooling 9 Room temperature Final preset temperature 2 C Continue heating Med with overload Lo Basic operation of Performs only fan operation at the See page 47 See page 51 See page 53 3 C Cooling temperature controller speed regardless of the room T temperature Starisio switch Heating final preset temperature 2 Sleep operation Enters sleep operation after set Same as at left Same as at left Same as at left Same as at left with sleep button ON as on the left See page 49 See page 51 See page 55 Performs the sleep operation of each operation mode Action during sleep operation Lo sleep operation 39 Table 1 Mode data file RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A LABEL NAME VALUE WMAX 4400 min 4400 min 5500 5100 WMAX2 4500 min 4500 min 5600 5100 WSTD 3500 min 3500 min 4950 5100 WBEMAX 3000 2800 2800
102. ly does not operate during dehumidifying The circulation stops occasionally during Heating mode When the fan speed is set at HIGH or MED the flow is actually Weak Heating operation stops while the temperature is preset at 30 Compressor may not operate when room temperature is 10 C or less It also stops when the humidity is preset humidity or less It occurs during defrost ing Wait for 5 10 minutes until the condenser is defrosted At the beginning of heating the fan speed remains LOW for 30 seconds If HIGH is selected it switches to LOW and again to MED after additional 30 seconds If temperature is high in the outdoor heating operation may stop to protect internal devices 86 AUTO FRESH DEFROSTING After the ON OFF button is pressed Auto Fresh Defrosting is carried out the to stop heating the outdoor unit is system checks the outdoor heat exchanger still working with the OPERATION and defrosts it as necessary before stopping lamp lighting operation Fan speed does not change when fan speed selector is changed At this point fan speed is automatic during auto operation This is because Nice temperature reservation function is operating This function starts operation earlier so the preset temperature is reached at the preset time Operation may start maximum 60 minutes before the preset time When on timer has been programmed operation starts before the pr
103. mmunications from indoor microcomputer to outdoor microcomputer Fig 2 1 Indoor outdoor interface Circuit 63 Outdoor HIC Pin Pin 69 Indoor microcomputer Pin Pin DC 35V line SE 5V OV ELS V 100ms Leader 33ms 1 frame Fig 2 2 Voltages Waveforms of indoor Outdoor Microcomputers Outdoor to Indoor Communications Outdoor Pin Pin 69 Indoor microcomputer Pin Pin DC 35V line oV LI L J U switching time 4 95ms 33ms Transmit receive 1 frame 55 Fig 2 3 Voltages Waveforms of indoor Outdoor Microcomputers Indoor to Outdoor Communications 64 S pue 0 s eu 0 Jopee L 0 ON Hd 5 suce suige p swig xo1dde 2 L 0 euin Buryojims jasal U YM ON 2 AI9581 100pu gt 100pino 2 014 0 4 0 4 0 ON suig e swe ee suoi xoidde z 0 Jopee 19501 ueuM
104. mputer judges that the compressor is overheated and stops operation e 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 e During defrosting operation the microcomputer transfers the defrosting condition command to the indoor microcomputer via the circuit interface e The microcomputer always reads the outdoor temperature via a thermistor microcomputer 62 and 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 dry mode The following shows the typical values of outdoor temperature in relation to the voltage Table 9 1 Outdoor temperature C Microcomputer pin 5 voltage V Reference When the thermistor is open in open status or is disconnected microcomputer pins 62 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 pf 10 Reset Circuit Main HIC P W B Microcom
105. n if it is in OFF mode When Lightning Occurs Warning To protect the whole unit during lightning please stop operating the unit and remove the plug from the socket Interference From Electrical Products ami lt gt Inverter type fluorescent lamp A Caution To avoid noise interference please place the indoor unit and its remote controller at least 1m away from electrical products To prevent interference place at least 1m away 20 MAINTENANCE A WARNING e Before cleaning stop unit operation with the remote controller and turn off the circuit breaker CAUTION e Do not expose the unit to water as it may cause an electric shock e For cleaning inside the air conditioner consult your sales agent e Avoid using detergent when cleaning the heat exchanger of the indoor unit Unit failure may result e When cleaning the heat exchanger with a vacuum cleaner make sure to wear gloves so as not to injure your hands on the heat exchanger fins 1 AIR FILTER Clean the air filter as it removes dust inside the room Be sure to clean the filter once every two weeks so as not to consume electricity unnecessarily PROCEDURE 1 Pull the filter toward the center until it detached from the holders Then take it out from holders Pull refer to diagram 1 2 Remove dust from the filter using a vacuum cleaner If th
106. n the AUTO fan speed mode is set in the cooling heating operation d N e The fan speed will automatically change according to the temperature of discharged air e When the difference of room temperature and setting temperature is large fan starts to run at HI speed e When the room temperature reaches setting temperature fan speed changes to LOW automatically For the heating operation e When the difference of room temperature and setting temperature is large fan starts to run at HI speed For the cooling operation e After room temperature reaches the preset temperature the cooling operation which changes the fan speed and room temperature to obtain optimum L conditions for natural healthful cooling will be performed Z es HEATING OPERATION e Use the device for heating when the outdoor temperature is under 21 C When it is too warm over 21 C the heating function may not work in order to protect the device e In order to keep reliability of the device please use this device above 15 C of the outdoor temperature N Press the FUNCTION selector so that the display indicates HEAT Set the desired FAN SPEED with the FAN SPEED button the display indicates the setting AUTO The fan speed is HI at first and varies to MED or LOW or SILENT automatically when the preset temperature has been reached HI Economical as the room wi
107. nd the overcurrent breaker of the household power board will probably activate In case of active module faulty or defective connection Although the compressor continues to operate normally the power factor will decrease the operation current will increase and the overcurrent breaker of the household power board will probably activate Reference If diode stack 1 is faulty the compressor may stop due to Ip anbormally low speed etc immediately after it starts or it may not operate at all because no DC voltage is generated between the positive and negative terminals If diode stack 1 is faulty be aware that the 25A fuse might also have blown If diode stack 2 is faulty DC voltage may not be generated and the compressor may not operate at all Also be aware that the 3A fuse might have blown 60 3 Smoothing capacitor C501 C502 C503 This smoothes averages the voltage rectified by the diode stacks lt Notes gt Smoothing capacitor C501 is not available for model RAC 25NH5 and RAC 35NH5 Smoothing Capacitors SPM2 Fig 1 2 e Be careful to avoid an electric shock as a high voltage is generated Also take care not to cause a short circuit through incorrect connection of test equipment terminals The circuit board could be damaged I I 1 I I I 1 DC voltage approx 260 360V during operation eu Fig 1 3 4 Smoothing capacitor C010 C011 Referenc
108. normal D908 D909 or drive circuit is abnormal 5 When all voltage are abnormal IC901 R906 etc are possibly abnormal If 12901 is abnormal be aware that other components such as the power module REG regulator etc are possibly defective When the switching power supply seems to be abnormal the voltage between 901 pin to be measured at the leads of R904 and R903 and 901 pin 5 to be measured at R906 lead may be between 11 and 16V This is because the protection circuit of IC901 is operating 5 Reversing valve control circuit I F 35V Reversing valve FUSE RESISTOR DC voltmeter or tester MICROCOMPUTER Fig 5 1 e Reversing valve control circuit can switch reversing valve ON OFF according to instruction from indoor microcomputer depending on the operation condition shows in Table 5 1 Voltage at each point in each operation condition is approximately as shown below when measured by tester When collector voltage of Q701 is measured Table 5 1 Operation condition Collector voltage of Q701 Cooling General operation of Cooling About 35V In normal heating operation About 0 8V MAX rotation speed instructed Heating by indoor microcomputer after About 0 8V defrost is completed Defrosting About 35V Dehumidifying Sensor dry About 35V ED 6 Rotor magnetic pole position detection circuit System power module
109. oldering iron with transformer If one is used thermal fuse inside transformer will be blown As shown above apply soldering iron to metal Soldering Z parts receptable inside the sleeve iron corresponding to P1 and 1 terminals of system power module Do this with smoothing capacitors kept connected By removing red gray lead wire from diode stack power supply can be shut off corresponding to and System power module terminals of system power module RAC 25NH5 RAC 35NH5 SPM2 Smoothing capacitors RAC 50NH5 SPM2 Smoothing capacitors O O O O O O O xd TROUBLESHOOTING WHEN TIMER LAMP BLINKS Model RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A Perform troubleshooting according to the number of times the indoor timer lamp and outdoor LD301 blink SELF DIAGNOSIS LIGHTING MODE Model RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A Remark If using wired remote controller electrical cover have to be opened so that timer lamp at indoor p w b can be seen as Fig 1 If using wireless remote controller optional part no need to open electrical cover Refer the timer lamp at panel as Fig 2
110. or unit is inclined water may leak Be sure to completely seal any gap with putty e The connecting pipe no matter big or small should all be insulated with insulation pipe and then wrapped with vinyl tape The insulator will deteriorate if it is not wrapped with tape a GG ill lf f 4 The indoor piping should be insulated with the enclosed insulation pipe lf the insulator is insufficient please use commercial products Drain pipe must be installed separately Insulate indoor part of pipe to prevent condensation Electrical Air outlet box Wired Remote controller Filter Air inlet Height difference and Piping length of Indoor and Outdoor unit are different by Outdoor unit Please refer to the installation manual in Outdoor unit gt SAFETY PRECAUTION AB Please read the Safety Precaution carefully before operating the unit to ensure correct usage of the unit Pay special attention to signs of Warning and Caution The Warning section contains matters which if not observed strictly may cause death or serious injury The Caution section contains matters which may result in serious consequences if not observed properly Please observe all instructions strictly to ensure safety e The sign indicate the following meanings Make sure to connect earth line O The sign in the figure indicat
111. ost 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 Notes The sleep operation starts when the sleep key is pressed When the sleep key is set the maximum compressor speed is limited to WSTD 2000 2 and the indoor fan is set to sleep Lo 30 minutes after the sleep key is set the sleep shift of set temperature starts The maximum sleep shift of set temperature is 5 C and the minimum is 12 C If the operation mode is changed during sleep operation the changed operation mode is set and sleep control starts The indoor fan speed does not change even when the fan speed mode is changed Lo When defrosting is to be set during sleep operation defrosting is engaged and sleep operation is restored after defrosting When operation is stopped during sleep operation the set temperature when stopped as well as the time continue to be counted If the set time is changed during sleep operation all data including set temperature time etc is cleared and restarted 10 If sleep operation is canceled by the cancel key or sleep key all dat
112. otation speed commanded by the indoor microcomputer 78 Detection Resistor R24 ANY DC Current Direct Current N1 P2 DC 260 380V o SPM2 BV 001 C205 MAIN P W B 68 68 6 50 38 18 oV 0v 5V 48 R245 1 w d m 8248 L A Microcomputer S ya O ov Is 5V pn a 0104 R005 R222 bw n 68 w 61 Is R221 0218 ov S JE Y o Y ov 0v ov ov Fig 8 6 Voltage at microcomputer pin Rotation speed of compressor Commanded rotation speed Actual rotation speed Deceleration Acceleration Deceleration Acceleration le gt lt gt gt lt Fig 8 7 2 Voltage amp circuit e The voltage amp circuit amplifies the DC current level detected by the detection resistor after being converted to a voltage and supplies it to the microcomputer Receiving this 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 e The filter consisting of R245 and C217 removes high harmonic components from the voltage generated from the DC current flowing to the detection resistor and supplies it to IC4 pin s IC4 forms a non inverting voltage amp
113. ower source L 19 50Hz 220 240V Magnetic relay OUTDOOR UNIT Outdoor DC fan motor _SPM2 i ACT Power circuit Power module Room temperature thermistor Heat exchanger thermistor Static pressure select switch Drain pump test switch gt Temporary switch Initial setting circuit gt Indoor microcomputer AX 7X20 Reset circuit H link uul DC compressor motor 2 DC fan motor drive circuit DC fan motor drive circuit Wireless remote control Option parts Wireless remote control receiver circuit NZ EM Indoor fan motor 1 DC35V Micro computer clock circuit a O pat Reversing valve coil N Outdoor Inrush current l unit Protection circuit Terminal board DC current signal Rotor magnetic pole position detection circuit Peak current cut off circuit gt c Buzzer circuit Overload control O ti circuit peration gt Indicating lamp Timer gt Voltage amplification circuit Over heat thermistor gt Stepping motor Defrost thermistor M Drain pump motor Outdoor tempe
114. problem Stop after the Fan motor runs 2 minutes Fan Motor may be broken Caution 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 due to the built in control circuit in Fan Motor 84 12 Power Factor Control Circuit Power factor is controlled to almost 100 Effective use of power With IC in ACT module control is performed so that input current waveform will be similar to waveform of input voltage input current V input voltage Effective voltage area Effective voltage area Invalid power area Even if voltage is applied current does not flow Assuming the same current capacity 20A power can be used about 10 effective comparing with curent use power factor of 9096 and maximum capacity is thereby improved 85 SERVICE CALL Q amp Model RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A COOLING MODE The compressor has stopped suddenly during cooling operation Check if the indoor heat exchanger is frosted Wait for 3 4 minutes until it is defrosted Sound of running water is heard from indoor unit during dehumidifying If the air conditioner operates in cooling mode when it is cold the evaporator may get frosted Normal sound when refrigerant flows in pipe Compressor occasional
115. puter C107 Fig 10 1 e The reset circuit initializes the microcomputer program when Power is ON or OFF Low voltage at pin 48 resets the microcomputer and HI activates the microcomputer e Fig 10 1 shows the reset circuit and Fig 10 2 shows waveform at each point when power is turned on and off e When power is turned on 12V line and 5V line voltages rise and 12V line voltage reaches 10 9V and reset voltage input to pin 68 of microcomputer is set to Hi e Reset voltage will be hold Hi until the 12V line voltage drops to 9 90V even though the power shuts down 12V line 12 6 5V line Power is ON Voltage V Reset voltage Time 12V line 12 LL 62 o 55 5V 5 6 ine Reset voltage 0 Time Fig 10 2 82 11 Outdoor DC Fan Motor control circuit System power module O 8 T 8 U amp FREE Power supply for DC fan motor from smoothing 2 w capacitor in system power module 8 9 7 GOO OODOOE _ LU cL pa A Main P W B 1 2A FUSE CETERO X Motor coil f 2 C101 i x
116. r source 10220 240 50Hz System power module 2 Power module Compressor motor i ACT Module Indoor unit electric parts rr Control L MAIN P W B Across a b 0V line Across 8 ground Across b OV line ground approx 260 360V approx 155 170V approx 155 170V Always keep your hands and metallic things away from the enclosure of the oscilloscope DANGER Don t install the ground Oscilloscope LUI JA e TII 89 DISCHARGE PROCEDURE AND POWER SHUT OFF METHOD FOR POWER CIRCUIT Caution AN e Voltage of about 300 330V is charged between both ends of smoothing capacitors WARNING e During continuity check for each part of circuit in indoor unit electrical parts disconnect red gray lead wire connected from diode stack to system power module SPM2 to prevent secondary trouble Be sure to discharge smoothing capacitor 1 Turn OFF the Power supply to the outdoor unit 2 After power is turned off wait for 10 minutes or more Then remove electrical parts cover and apply soldering iron of 30 to 75W for 15 seconds or more to P2 and N1 terminals on system power module in order to discharge voltage in smoothing capacitor 3 Remove receptable of red gray lead wire connected to system power module from diode stack before performing operation chech of each circuit Do not use a s
117. r unit microcomputer switching timing to U transistor from W transistor is produced by delaying 30 from rise waveform ignoring spike voltage In addition switching timing to U transistor from W transistor is YOLOW 405535 ircui 7 Drive C Fig 7 1 shows the drive circuit The circuits for U phase V phase and W 1 2 ANy vod LN diNO9 phase have the same Configuration 6 1 MON 7100 SSS Se ra x 5 Hare NON mO i l ONN WO ty ta t j OBINO5 P I OM 806 FIND 200 T MON i gere T 4 OFF 49 x 9 TT den GOGH 9 amp N 3 n 9 0 194 d Ns 2 i lo LOSH M 8 182 19 M iN NIY Md 2 O eseud JO SISUEJ y SI AGL 0 01 SI pue O indui s 1ndjno n jo esneoeq 1eddouo ou eseud uoee 10 12 0 1ndno si euis e
118. rature thermistor I CIC gt gt Indoor Outdoor interface circuit ZA p ns 227 D D lt gt Trip signal synthesis circuit Upper arm drive circuit Peak current cut off Lower arm z drive circuit lt I lt 2 5 Q g 6 Ur Electric Self diagnosis circuit Expansion valve gt Electric Expansion valve drive circuit Clock circuit gt Relay drive circuit Power circuit Indoor unit Power circuit P W B Reset circuit 37 BASIC MODE MODEL RAD 18NH7A RAD 25NH7A RAD 35NH7A RAD 50NH7A Qperation mode i Dehumidifying dehumidityi tion by th i Fan Cooling me nee button only not including Heating Auto that engaged by the dehumidify button Basic operation of start stop switch Start Stop Start Stop Start stop switch Operation tamp Start stop switch m B u Operation tamp Cancel switch P Operation temp Off timer Timer tamp Timer memory d
119. rned off 5V C401 R404 3 Microcomputer 7 SCL 6 SDA 1 401 E2PROM ov Fig 5 1 6 Temporary Switch INDICATION P W B OPtion 5V 5V Micro computer R601 C2 ANN t t 48 HA input Temporary M1 GLI M 8 Aa Switch 1 R602 C601 CN9 I 0 oV IL 4 g Temporary Switch 2 Lote Fig 6 1 e The temporary switch is used to operate the air conditioner temporarily when the wireless remote control is lost or faulty 57 7 Drain pump drive circuit When cool or dehumidifying operation pin 68 of the micro computer goes Hi Q333 and Q932 turn on and the drain pump drive Drain pump motor Micro computer L933 R931 Drain pump 68 PO AAA R932 8 Drain pump trial run switch 5V R533 R534 Drain pump Microcomputer I p trial run SW normally Hi OV e This switch forcibly turns the drain pump on When the drain pump trial run switch is turned on the timer indicator will blink seven times and no remote signal will be accepted 9 Float switch 5V 4 FLOAT SW OF t NW R620 Microcomputer R539 C620 R621 CN16 oV OV oV Normally Hi 4 5V e This is a float type switch that monitors the drain level of drain pan The switch wi
120. roprocessor circuit and DC Fan Motor circuit which 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 Microprocessor 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 control PWB will blink 12 times Fan Motor lock detected R107 and 124 are used for Fan Motor over current 83 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 when 2A Fuse was burned Please replace both DC Fan Motor and 2A Fuse together 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 of Fan Lock Stop even though the DC Fan Motor is rotating correctly the possible casue is Fan Motor problem or PQ102 on board or control board
121. rost mode indoor operation lamp will blink at interval of 3 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 C When fan is set to Med or Lo compressor rpm will be limited to WBEMAX 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 or outdoor temperature is lower than 5 C compressor rpm is WMAX2 11 During Hot Dashed when room temperature reaches set temperature SFTDSW compressor rpm is actual rom x DWNRATEW Table 3 ATWMAX Temperature difference Calculated compressor rpm 1 66 1965 min 2 2135 min 2 33 2300 2 66 2465 3 2635 min 3 33 2800 min 2965 min 3135 min 3300 3465 min 3635 min 3800 3965 min 4135 min 4300 4465 4635 min 4800 4965 5135 min 5300 min 5465 5635 min 5800 5965 6135 min 6300 min 6465 Notes 6635 min 1 See the data in Table 1 on page 43 for each constant in capital let
122. rs so the current flows to the motor windings as shown in Fig8 9 2 Varies the turn ON time of the W transistor according to the DC voltage level and the start is controlled so the start current is approx 10A as shown in Fig 8 10 Power module DC current DC 260 360V Detection resistor Chopper duty high 5 o DC voltage low DC voltage 280V S2 DC voltage high ZO 1 1 20 DC voltage start current 15 Set value 10 Fe o 5 a Time Fig 8 10 80 9 Temperature Detection Circuit HIC 45V O H thermistor Normal 2 7V or less Over heat 2 7V or more Reset 2 3V or less O H F Microcomputer DEF thermistor oV Normal 2 4V or more Over heat 2 4V or less Reset 2 9V or more Outdoor temperature 5V thermistor Refer to the table 10 1 Outdoor temperature Fig 9 1 e The Over heat thermistor circuit detects the temperature at the surface of the compressor head the Defrost thermistor circuit detects the defrosting operation temperature e A thermistor is a negative resistor element which has the characteristics that the higher lower the temperature the lower higher the resistance e When the compressor is heated the resistance of the Over heat thermistor becomes low and voltage at pin 62 of microcomputer is increased e Microcomputer compares the voltage present at pin with the internal set value if it is exceeded the set value microco
123. s 3 times Switching incomplete LD301 Blinks 4 times e Simplified check of power module Lighting mode when operated with compressor leads disconnected 1 Disconnect connector of 3 pole WHT YEL RED lead wire connecting to compressor located at the lower part of electric parts box 2 Set to compressor operation state other than FAN mode and press Start stop switch of remote control 3 If normal operation continues for more than 1 minute LD303 lights power module is considered normal Refer to other item troubleshooting page 94 for independent checking of power module 69 4 Power Circuit for P W B e Fig 4 1 shows the power circuit for P W B and waveform at each point Switching transformer T1 ud 0909 85V MIS I j Diode stack 2 ain R914 RC2 i R902 i haw 17V L 8915 0908 1902 8 R901 C901 wp n Ton ines 0911 49 of le 15 R002 sz ib R917 0909 oV w 5 i 0 D903 R910 i 4 5V LT 57 za 5 L 9 49 s 4 2838 0910 5 R D95 S amp T 13 e e e e 4 i
124. sons unless they have been adequately supervised by a responsible person to ensure that they can use the appliance safely e Young children should be supervised to ensure that they do not play with the appliance MULTI AIR CONDITIONER With this multi air conditioner several indoor units can be connected to one outdoor unit to be driven You can operate the required number of indoor units N Combination of Operations When operation mode is selected You cannot operate the indoor units in the following combinations e The indoor unit which is switched on first continues to operate but other indoor units which is switched One unit Other unit on later does not operate while the lamp lights Cooling e Tore start an indoor unit which was operated later Heatin Dehumiditvin stop the indoor unit which was operated first or 9 ying later and reset the type of operation then perform Circulating fan j operation again During automatic operation e When heating operation is automatically selected for the first indoor unit the next indoor unit will then start to heat Also if cooling or dehumidifying is automatically selected for the first indoor unit the next indoor unit will also start to cool or dehumidify A 9 E Adjusting the Number of Indoor SE Stopped Indoor Units Units 2 When indoor unit is operated the Decrease the numb
125. temperature has been reached Economical as the room will become cool quickly HITACHI MED Fan speed slow LOW Fan speed slower SILENT Fan speed ultra slower Set the desired room temperature with the TEMPERATURE button the display indicates the setting The temperature setting and the actual room temperature may vary some how depending on conditions Press the O START STOP button Cooling operation starts with a beep Press the button again to stop operation The START Cooling function does not start if the temperature setting is higher than the current room temperature even though the O 9 OPERATION lamp lights The cooling function will start as soon as you set the temperature below the current room temperature As the settings are stored in memory in the remote controller you only have to press the O START STOP button next time 145 TIMER RESERVATION ON Timer and OFF Timer are available OFF TIME setting Select the OFF TIME by pressing the Button e Setting time will change according to the below sequence when you press the button 0 5 hour interval 1 hour interval p R 0 5 41 011 5 gt gt 9 54 10 X 11 212 OFF The value change quicker if you keep pressing the button Press the 1 Res
126. ter to the body of the unit when cleaning it as this may cause short circuit e Do not use any aerosol or hair sprays near the indoor unit This chemical can adhere on heat exchanger fin and blocked the evaporation water flow to drain pan The water will drop on tangential fan and cause water splashing out from indoor unit high speed fan inside the unit may cause danger o 8 e Please switch off the unit and turn off the circuit breaker during cleaning the e Turn off the circuit breaker if the unit is not to be operated for a long period Q 8 e Do not climb on the outdoor unit or put objects on it e Do not put water container like vase on the indoor unit to avoid water dripping into the unit Dripping water will damage the insulator inside the unit and causes short circuit e When operating the unit with the door and windows opened the room humidity is always above 8096 and with the air deflector facing down or moving automatically for a long period of time water will condense on the air deflector and drips down occasionally This will wet your furniture Therefore do not operate under such condition for a long time e If the amount of heat in the room is above the cooling or heating capability of the unit for example more people entering the room using heating equipments and etc the preset room temperature cannot be achieved e This appliance is not intended for use by young children or infirm per
127. ters in the diagrams 49 Reversing Valve Defrosting Heating Sleep Operation 15 or more Auto fresh defrosting Final set Initial for heati temperature nitial set temperature for heating 0 33 C sleep shift heating set temperature sleep shift Over defrosting inhibit period Example when set Heating set temperature temperature is low Remote control set temperature min12 ap NM 0 5hr 1hr 1hr 4 5hr gt lt gt lt 3hr Fan speed Start Stop Switch Set to Hi Defrost signal Preheating judgment o Lo Med Lo 10sec Ultra Lo Indoor fan Set to 7 hours Sleep key E Outdoor fan Operation lamp Operation lamp Timer lamp Reversing valve heating on mode Reverse cycle period Reverse cycle period Hi Med See basic operation Deceleration period TDF TDF TDF 411 421 lt Indoor fan 12min Max 3min Max in 12min Max gt J gt lt gt Lo sleep See basic WMAX i Outdoor fan operation WMAX2 p Horizontal air a deflector Shut 0 Horizontal Facing down Notes 1 The defrosting inhibit period is set as shown in the diagram below When defrosting has finished once the inhibit period is newly set based on the outdoor temperature when the compressor was started During this period the defr
128. the START STOP button Dehumidifying operation STOP starts with a beep Press the button again to stop operation 7 As the settings are stored in memory in the remote controller you only have to press the D START STOP button next time CG r 6853 A GD DIY oO HITACHI Dehumidifying Function When the room temperature is higher than the temperature setting The device will dehumidify the room reducing the room temperature to the preset level When the room temperature is lower than the temperature setting Dehumidifying will be performed at the temperature setting slightly lower than the current room temperature regardless of the temperature setting The function will stop the indoor unit will stop emitting air as soon as the room temperature becomes lower than the setting temperature COOLING OPERATION Use the device for cooling when the outdoor temperature is 10 43 C If indoor humidity is very high 80 some dew may form on the air outlet grille of the indoor unit Press the FUNCTION selector so that the display indicates COOL Set the desired FAN SPEED with the FAN SPEED button the display indicates the setting AUTO The FAN SPEED is HI at first and varies to MED or LOW or SILENT automatically when 2 the preset
129. u EJEWJOU S 24 34 OW 8 10287 Jamod eui eoejdou eui S 21 peeds j euuouqy LOE pue pea sued Aue eoejdey lewiou BY S pue SO ewou Jamod 5 su Jamod 5 991 S OU p SUNG 0601 ou S9A lewiou 1 5 JO pue 6vSH ZPSH LrGH 09 ev S Syulg 0841 syed Jo IND JOMO jemod uieis s syed Mau Aununuoco 2 SOSH 1015 1941 HO u sued EJEWJOU n9119 eui S 9 eu L 9 LOE 101 1 yeu ans exei sued Aue ewou 19581 BU S sued Aue eoe deH eui woad ewou SI e
130. ui jou 14 peijddns si samod snf 58015 pue 51959 HUN y U8A8MOH si 87 uid dojs jesay si AfewuoN lewuou jeubis indui dl S e sued Aue 5 0 pue 2799 GOGH SOK ewou BU S SOA ainpow ewou Ino lueINo Jamod ujejs s eui 5 5 SI au z 10287 102 POWER CIRCUIT Phenomenon 1 lt Rotation speed does not increase gt Recheck cord etc of the system power module If they are disconnected connect them securely Is the DC voltage at least 350V Yes Is the OVL lamp lit If the lamp is lit it does not abnormality continues replace the system power module indicate fault but the unit is overload status Overvoltage defect system power module faulty 15 times blinking 103 JUDGING BETWEEN GAS LEAKAGE AND CHECKING THE REFRIGERATING CYCLE Gowpressor DEFECTIVE 1 Troubleshooting procedure No operation No heating No cooling Lighting mode Connect U V W phase lea

Download Pdf Manuals

Related Search

Related Contents

Pond Aerator  SOFT DENTURE LINER MATÉRIAU SOUPLE DE  

Copyright © All rights reserved. Failed to retrieve file