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SERVICE MANUAL

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1. C 25CNH11 for compressor 5 ah MP6501 Fuse 15A Noise filter coi Stick relay Power module 55889 go PM NE Varistor 1 ai R T 2 T Surge UAW Ts 1 GRN Absorber 8 S Inrush current 5 t s v 9 S protection d Varistor 3 i om ED WaT 5 9 o 1804 Power relay A 061 060 2 8 50 pote GA pue mh ma SC 063 2 0 yore 0 8 0 Fre m 8 0 i Mak ce iun 6 0 13 0 5 Oy d NY 7 8 C65 zz M61 5V 5 e
2. e ROOM HEAT EXCHANGER ROOM TEMPERATURE THERMISTOR THERMSTOR S lw 6 4 ei 885 EE wv nv RY 5 760 E OOM o0Q9O00l 19 90 Eod 5v MAIN P W B 0 0 5 Pu AO gt 12V t M Ee gt 5V em gt 0 3D 2 mim N CO Y V ys _ 16401 ite 5 0 OV OV OV 3 E PROM a 25 m 0 TERMINAL BOARD S D iis OSSCLATOR D 42 m L 4 G En Asn Ax LINE CORD pos BOARD gH ia 5V R205 7 y Te E 70202 Haly ai RP TUER OV O 0202 A 8x POWER SWITCH S 4 17 RES E amp B amp CRB a 02 z 208 EE g ZR 4P i sy Oe SL 826 lt 1 7 25 R401 lt 23 PG HA QU i FAN PUM OUTPUT lt 25i EUN IC1 lt br IER lt 75 12 NDICATION P W B 2 INDICATION 1
3. SPEED AUTO Press the FUNCTION selector so that the display indicates FAN Press the FAN SPEED button START Press the START STOP button Fan operation starts with STOP 2 beep Press the button again to stop operation 2 lt ES Note In the fan operation mode only display of FAN SPEED setting will change by pressing FAN SPEED button the actual fan speed cannot be changed directly from to LOW mode When the AUTO fan speed mode is set in the cooling heating operation For the heating operation 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 cooling operation M e When the difference of room temperature and setting temperature is large fan starts to run at HI speed e After room temperature reaches the preset temperature the cooling operation which changes the fan speed and room temperature to obtain optimum conditions for natural healthful cooling will be performed 15 HOW TO SET THE Time Day Month 1 Set the current month and TIME DAY After you change the day with the TIMER control MONTH batteries button current ti
4. l 45 Discharge grill Vertical air deflector 450 fe Horizontal air 45 deflector MODEL RAC 25CNH11 570 Air outlet Handle Viewed from P for 065 mm pipe 2 Line cord Connecting cable Cabinet 6 5 59 When piping is drawn horizontally exchange the drain hose for the drain cap Narrow pipe 26 35 Wide pipe 29 52 53 236 10 Handle 20 482 gt T 1 517 illi Air inlet MAIN PARTS COMPONENT THERMOSTAT Thermostat Specifications MODEL RAS 25CNH1 1 THERMOSTAT MODEL IC TEMPERATURE C F FAN MOTOR INDICATION 16 17 6 16 6 61 8 INDICATION 24 25 6 78 1 INDICATION 32 Fan Motor Specifications MODEL 33 6 RAS 25CNH1 1 6 92 90 6 24 6 7 32 6 RAC 25CNH1 1 RATED VOLTAGE DCO 35V DC230V OUTPUT 20W 20W CONNECTION RED YELLOW 5V BLUE YELLOW RESISTANCE VALUE Q 30 COMPR
5. Reverse bias Current at point current Fig 7 3 Waveform of Transistor Base Current Reverse Current at Point e R507 is used to charge C501 initally e The operation is the same for B and C phases 76 2 Lower Arm Drive Circuit e Fig 7 4 shows the lower arm drive circuit The circuit configuration is completely the same for phases A B and C Power module A phase B phase lu C phase 112 D411 0412 Fig 7 4 e When 69 of the micro computer goes Lo Hi a photocoupler between 601 pins 1 and 2 turns on and current flows to terminal 1 R601 PQ601 R604 power module s BUT terminals Ew terminals D602 D601 terminal k and drives the lower arm transistors Fig 7 4 e The signals which turn on or off according to the position detection signals are output from pins 636469 of the micro computer in the same way as in the upper arm drive circuit and are input to pins 1 of photocouplers P601 and 602 via driver e No chopper signal is input to the lower arm drive circuit Power module phase phase 1 R417 W w C phase e a w D411 0412 CN28 C411 Fig 7 5 e When pin 5 of the micro computer goes Hi Lo a photocoupler between PQ601 pins 1 and 2 turn off and reverse bias current flows to C411 power m
6. NET WEIGHT SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT ROOM AIR CONDITIONER INDOOR UNIT OUTDOOR UNIT JANUARY 2003 H A P M 10 Any inflammable thing should never 25 Sa 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 the instructions in the Service Manual of the unit If the contacts of electrical parts are defective replace the electrical parts without trying to repair them After completion of repairs the initial state should be restored Lead wires should be connected and laid as in the initial state Modification of the unit by user himself should absolutely be prohibited Tools and measuring instruments for use in repairs or inspection should be accurately calibrated in advance In installing the unit having been repaired be careful to prevent the occurence of any accident such as electrical shock leak of current or bodily injury due to the drop of any part To check the insulation of the unit measure the insulation resistance between the power cord plug and grounding terminal of the unit The insulation resistance should be
7. NO gt Is a AC 220V voltage generated between terminals A and B of the terminal board in the outdoor unit YES V Is the air conditioner operated by pressing the temporary operation switch NO YES gt ves Is a DC 35V voltage generated between terminals C and D of the terminal board in the outdoor unit gt Check power cord power switch and terminal board Repair defective parts gt Check the indoor outdoor connection cable and correct the abnormal state wrong connection poor insertion etc YES 4 Are jumper cables C and D connected in reverse NO YES gt Correct the connection Check the power circuit and peripherals and correct the defective parts Check the remote controller Refer to Checking the remote controller Is there poor contact of CN2 disconnec tion of leads etc Replace the remote controller Correct the lead wires connection of the connector Replace the light receiving unit YES Does the timer lamp blink 13 times when the breaker is turned ON NO NO Is the control voltage generated normally gt Is DC 12V voltage being generated at both ends of C102 YES Is micro computer reset input pin D set
8. ADJUSTING THE AIR DEFLECTOR D 2 Adjustment of the conditioned air in the upward and downward directions The horizontal air deflector is automatically set to the proper angle suitable for each operation The deflector can be swung up and down continuously and also set to the desired angle using the AUTO SWING button e If the AUTO SWING button is pressed once the horizontal air deflector swings up and down If the button is pressed again the deflector stops in its current position Several seconds about 6 seconds may be required before the deflector starts to move e Use the horizontal air deflector within the adjusting range shown on the right e When the operation is stopped the horizontal air deflector moves and stops at the position where the air outlet closes CAUTION e In Cooling operation do not keep the horizontal air deflector swinging for a long time Some dew may form on the horizontal air deflector and some dew drops may fall from it Adjustment of the conditioned air to the left and right Hold the vertical air deflector as shown in the figure and adjust the conditioned air to the left and right 20 When cooling dehumidifying When heating HOW TO EXCHANGE THE BATTERIES IN THE REMOTE CONTROLLER old batteries Remove the cover as shown in the f
9. Fig 4 1 Auto Sweep Motor Circuit Horizontal air deflectors e Fig 4 1 shows the Auto sweep motor drive circuit the signals shown in Fig 4 2 are output from pins 08 67 of the micro computer Horizontal air deflectors 10ms Micro computer pins Step width Horizontal air deflectors 7 8 Fig 4 2 Micro computer Output Signals e As the micro computer s outputs change as shown in Fig 4 2 the core of the auto sweep motor is excited to turn the rotor Table 4 1 shows the rotation angle of horizontal air deflectors Table 4 1 Auto sweep Motor Rotation Rotation angle per step Time per step ms Horizontal air deflectors 0 0879 10 57 5 Room Temperature Thermistor Circuit e Fig 5 1 shows the room temperature e The voltage at depends on the room thermistor circuit temperature as shown in Fig 5 2 5V Micro computer Room temperature thermistor Room temp input Voltage at 0 10 20 30 40 Room temperature Fig 5 2 6 Heat exchanger temperature thermistor circuit 5V Heat exchanger temperature thermistor Micro computer Heat exchanger temperature input ov ov Fig 6 1 detects the indoor heat 5 M exchanger temperature and controls the following 1 Preheating 2 Low temperature defrosting 6 during cooling and dehum
10. When the set temperature has been changed in the AUTO operation mode the operation mode is decided from the next operation according to the changed set room temperature for example If the set room temperature was lowered by 2 C in cooling operation each mode will operate in the following conditions Cooling Room temperature is higher than about 25 Dehurnidifying Room temperature is about 21 C 25 C Heating room temperature is lower than 219 The Nice temperature reservation is working correctly It starts working enough to reach the preset temeprature at the reserved time It will turn on up to 80 minutes earlier than the reserved time No it is impossible This works only in the cooling and heating operation 89 Even when the reserved time is the same the system turns on at a different time The Nice temperature reservation is working correctly The turn on time varies depending on the conditions of the room In the heating operation since the system calculates and corrects the starting time to reach the preset temperature at the reserved time under the current The present time display is turned off too soon The reserved time is erased though the timer was set In the auto fan speed mode the fan speed changes over between Hi Med and Lo The noise from the outdoor gets louder at the start of operation The noise of the outdoor unit changes from time to t
11. iL Super Hi mode operation is done during Cool dash operation with the compressor rotating at maximum speed and Hi mode operation is done in other modes Operation mode is changed to one of Lo Med Hi Super Hi and Stop according to the room temperature and time Super Hi operation is done when the compressor rotates at maximum or when recovering from defrosting Med mode operation is done regardless of the room temperature Operation mode is changed to one of Lo Med and Stop according to the room temperature and time Lo mode operation is done regardless of the room temperature Lo mode and Stop mode are repeated according to the compressor operation 32 Start Stop switch Compressor Lo Operation mode is changed to one of Lo and Stop according to the room temperature and time The fan speed is controlled by the heat exchanger temperature and overload control is done as shown below Heat exchanger temp KAFON KAFOF Overload Lo Basic mode of the temperature control Refer to page 45 Note 1 Refer to data in Page 41 Table 1 and 2 for each constant shown by capital letters in the diagram Refer to page 49 Refer to page 51 and 53 The following operation mode is set depending on the room temperature when the operation is started However in the auto cooling mode the Cool rhythm operation starts when the r
12. 4000 4000 2500 2500 2450 min 1950 mint 1950 DMIN 1950 min SDMAX 2500 min SDRPM 2150 min SHIFTW 1 33 C SHIFTC 0 C Table 3 Room temp shift value Table 2 Room temp shift value SFTRZM 2 0 C YNEOF 24 C TEION 5 C TEIOF 9 C TDSFNP 5 C 30 40 TDF411 57 sec TDF412 Above value 37 sec TDF413 Above value 0 sec TDF421 60 sec TDF422 3900 TDF431 75 sec SITUA 0 3 SITUB 5 67 C SFTDSW 1 33 C KAFON 48 C KAFOF 42 C Basic operation of Start stop switch Start Stop Operation lamp switch Start Stop Start Stop Start stop switch gy Reserve switch m m Cancel switch OFF timer Operation lamp Timer lamp Timer memory na OFF tim Start stop switch Reserve switch Cancel switch ON timer Operation lamp Timer lam Timer memory U Reserved time change ON timer in the operation mode Timer operation Voltage set value Heating Normal SHIFTW Super Lo AFWSS 9 8V Operation mode Shift value Operation mode Fan speed tap Label name Cooling Normal SHIFTC Lo AFWS 16 6V dehumidifying Cool Rhythm SFTRZM Overload AFWKAF 19 1V Heating Med AFWL 19 1V
13. 71 wv 2 HON To um 1 H7 5V S D 6 66 0501 0502 pu 2j 5 0 062 A 5 0 27 20 g 7 0 oF 20 82 G H 5 R201 mp OS i D g Test pn Gym 5V el m9 ON12 14 ov 095 ov 0503 054 F pu 9 EM 19 E dM 3 H gt 05 0 Em 8 7 8 T CN26 5 1 XH 9P 5 T w i 0902 E 2 2 3 Bl me 2 86 056 T ad iow 5 8 gt 5 G m QANA 0203 I gt 12 B NW 7 8 A 0 91 8 8 XH 2P lp ter x 4 22 6 R605 D thermistor 5 DU 1 y R308 0 ov R603 LU LD304 2 7 E R606 He 10302 bi 5 1 zm D601 060222 i LS e E e 3 Service 529 g 88 ov C601 o amp Kup Dj R309 0 0 4 ho R62 ROA tO CN16 R63 9 K Rever 2 vie co is com 9 ROM 91 VH 5 At 912 ov R915 Lo 95 t 912 Coi bVbV 89 T 0908 R918 Mise i BRN gt ov 3 Interface relay ol EAR 170 709 En OMe 490 4 erminal i ard GN 9 75 ur Mr VF GND R917 fg ov V e 6 A F 6 gt 5V Q HOH gt wv 2 gt 5V 21 CN25 i7 N26 9 A BLOCK DIAGRAM MODEL RAS 25CNH11 RAC 25CNH11 Power module INDOOR UNIT OUTDOOR UNIT Outdoor DC
14. YES Are indoor outdoor communication signals superimposed on the DC 35V of connection cable C D 36kHz approx 2Vp p Approx asy n OV Is an indoor transmiting signal gener ated at the collector of Q801 36kHz approx 2Vp p transmitting Approx 4V ov Perform a final check of operation 99 NO gt NO gt NO gt YES 4 Check the room temperature thermis tor and replace if it is defective Normal value 20jC gt approx 12 50 25jC gt approx 10k Q 30jC gt approx 8k Q Check the heat exchanger thermistor and replace if it is defective Normal value 20jC gt approx 12 50 25jC approx 10k Q 30jC approx 8k Q Check the electrical parts in the out door unit and repair defective parts around the outdoor interface trans mitting circuit Check the indoor interface transmit ting circuit and repair defective parts Check the electrical parts in the out door unit and repair defective parts around the outdoor interface trans mitting circuit Check the electrical parts in the out door unit and repair defective parts 4 Only the indoor unit fan does not operate other functions are normal YES E Replace the indoor unit fan motor Check whether the P W B pattern is shorted and replace REG2 Replace Q903 Replace L901 set to Hi or is the pulse waveform Replace Q904 output when operat
15. lt 6s a amp i lt 9 8 Dey Y VT C V S lt Dis Gun m 19 575 SIDETYPE Bi ps 7 Ur ee A D 9 d 8705 E 5 STEPPING REEN Q Pa O 2 MY EB B 8 8 MOTOR 3 3 5 Belge 2 RIO I Y 1 2 R793 D R702 J VVV DY ty ISN I lt 0 onn P PO D SV AN Le en Ley n e tea FJ ay ao DEED IE LA LE LM Y tuu 6 OPERATION TER 7 _ OV OV d HA C1 ID d 5 mo cp om 5 m R609 SHORT RANGE Ga M 88 _ M2 M OV ou OV RESISTOR CAPACITOR TRANSISTOR 1 0 ese R102 mios sow 17104 Rios 1 0 Eoi s 1104 es 1104 2 7K 5 1164 mw i16 R206 R208 5 5 sd EN 5 ESI 1596 210 21 302 303 K oo olo oo 8206 8208 5 820 RB 12k Es 8302 R303 Lo y R307 R308 12 7 R309 Ee EN 0 z 1 16W 1 16W resistance TeLERANCE Pener 8310 12 7 1 1 10 5 R312 5 l1 ll L R401 340 5 iziew 84021 340 5 1 164 R403 340 5 1 164 8404
16. 25 1757 0404 2503624 Lo C301 C933 DI DE Dior 640 6140 201 HSM2838C L qoc C4940 C942 401 HSM2838C D403 HSM2836C ae 401 DiFSO 0902 LFBO OSCILLATOR MODEL 8004 4 COIL SYMBOL RATED VALUE 1101 820 1 3 102 550uH 0 6A_ Lao 450uH 1 54 IC SI L IF HIC RREA3725 IR701 RRZL1816 LED SYMBeL MeDEL ceLeR_ pe LD702 SLR 332DC3F ORANGE LD703 SLR 342YC3F YELLeW ZENNER DIODE SYMBeL MeDEL 2101 PTZ5 1 20201 RZL24 20202 RZLIO r 35 DC brushless motor CIRCUIT DIAGRAM
17. 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 voltage Trip signal Modulates chopper signal to drive signal and stops according to presence ab synthesis circuit sence of lp signal or reset signal 78 Reset voltage mm Trip signal synthesis circuit Chopper signal DC current Reset Signal Chopper signal Outdoor micro computer DC 260V 290V Ip signal interrupt signal Overload external N set value circuit DC current level Power module photocoupler AX 8E21 Drive signal DC current R806 Fig 8 2 e The following describes the operations of each circuit in detail 1 Peak current cut Ip off circuit Fig 8 3 shows the Peak Current Cut off Circuit and Waveforms at Each Section DC current Id 18A 5 1 1 1 D Voltage at point 0 9V Normal Hi DC current _ Micro AY R806 computer current detection 8 21 OV resistor Micro c
18. Self diagnosis lamp Self diagnosis and mode Blinks 2 eak current cut p p LD301 imes LD301 Red E LD302 Red Self diagnosis lamps LD303 Red Abnormal low speed Blinks 3 rotation 0301 times Blinks 4 Switching incomplete LD301 times Blinks 10 Switching incomplete LD301 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 on page 91 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 2 DS 0 5 12 Pe 2 4062 9012 0 fuse 063 2 POF E i E R805 12V 5V AC 220V OV gt 5V C711 R62 25 __ 64 l l F 35V E gt F GND uum C712 R63 Ch Fig 4 1 Power circuit for PW B e In the power circuit for P W B power v
19. to Hi YES Does micro computer clock pins 5 6 oscillate normally Replace the control P W B YES YES Is a DC 12V voltage generated between and of REG2 YES Is a DC 5V voltage generated between and of REG2 255404 401 Check that there is no abnormality such as a pattern short on the P W B heating of parts etc and replace REG1 If the output is 15V or more it is also abnormal Replace it NO gt NO NO gt Check that there is no abnormality such as a pattern short on the P W B heating of parts etc and replace REG2 Check the reset circuit and repair defective parts Replace the micro computer and oscillator Perform a final check of operation 98 3 The outdoor unit does not operate remote control command can be received Does LD301 of outdoor electrical parts blink 9 times Is LD701 turned OFF within several ten seconds after it is lit Does LD701 light when the heating operation is done with the tempera ture set to 32 using the remote controller YES Does LD701 light when the cooling operation is done with the timpera ture set to 16jC using the remote controller
20. 0 Reversing Valve Heating ON mode 1 2 Conditions to start Cool dash operation are as follows When the operation starts with the AUTO or Hi fan speed or when the fan speed is changed to Hi during cooling operation if the temperature difference between the room temperature with the compressor rotating at maximum speed and the preset temperature is ATCMAX refer to Table 1 or more Cool dash will start Conditions for releasing Cool dash operation compressor maximum rotation speed period are as follows Cool dash has been continued for 25 minutes The room temperature reaches the cooling preset temperature including cooling shift value 1 C and then the room temperature gt preset temperature 0 66 C is reached after the fixed rotation period has elapsed The thermostat is turned OFF Ehen Cool dash is released by above 1 PI control starts without operating for fixed rotation period The thermostat OFF temperature during Cool dash operation is cooling preset temperature including cooling shift value 3 C and after the thermostat is turned OFF Cool dash is finished and PI control starts The minimum ON time of the compressor is 3 minutes and minimum OFF time is also 3 minutes The compressor speed in the fixed rotation period after releasing Cool dash maximum speed is the minimum speed CMIN The time limit to keep the maximum speed CMAX of the compressor in the normal cooling opera
21. 1MQ or more as measured by 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 25 4 installation 12 2 Check the grounding to see whether it is proper or not and if it is found improper connect the grounding terminal to the earth WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS 1 Scope The standards provide for items to be generally observed in carrying and handling semiconductors in relative manufacturers during maintenance and handling thereof They apply the same to handling of abnormal goods such as rejected goods being returned Object parts 1 Micro computer 2 Integrated circuits IC 3 Field effect transistors FET 4 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 y
22. Hi AFWH 27 7V Super Hi AFWHH 27 7V Lo AFCS 16 0V AFCL 18 7V Cooling Hi AFCH 20 9V Super Hi AFCHH 20 9V Lo AFDS 16 0V Dehumidifying AFDL 18 7V Super Lo AFDSS 15 0V Note 1 Refer to data in Table 1 and 2 for constants shown by capital letters in Table 3 Operation mode Cooling Dehumidifying Heating Auto Changes to Med or Lo from Hi according to the room temperature Room temp Cooling preset temp Thermostat judgement Compressor is forced stopped for 3 min Operation continues in Hi mode until the thermostat turns off for the 1st time Super Hi is set during Cool dash operation with the compressor rotating at maximum speed 2 Operates in Lo mode when the thermostat is OFF Operation mode is changed to one of Super lo Lo Med Hi Super Hi and Stop according to the room temperature time and heat exchanger temperature When the heat exchanger temperature becomes 18 or less except for the preheating operation mode Stop is set The operation recovers at 18 66 C Compressor rotates at maximum speed during Hot dash Other than on left operation or when recovered from defrosting Heat exchanger temp 42 66 37 66 32 66 27 66 Super Hi Hi Med 5 o o E
23. as shown below HITACHI Indication Sleep timer hour 2 hours 3 hours 7 hours Sleep timer off gt 4 E Sleep Timer The device will continue working for the designated number of hours and then turn off e SLEEP Point the signal window of the remote controller toward the indoor unit and press the SLEEP button The timer information will be displayed on the remote controller The TIMER lamp lights with a beep from the indoor unit When the sleep timer has been set the display indicates the turn off time IIE Example you set 3 hours sleep 45 Loc time at 11 38 p m the turn off l H time is 2 38 a m Sleep The device will be turned off by the sleep timer timer and turned on by on timer 1 Set the ON timer 2 Press the SLEEP button and set the sleep timer qe For heating O i In this case the device will turn off Lu 4 in 2 hours at 1 38 a m and turn on early so that the preset temperature will be almost reached LL at 6 00 next morning J How to Cancel Reservation Point the signal window of the remote controller toward the indoor unit and press the O CANCEL button The RESERVED sign goes out with a beep and the TIMER lamp turns off on the indoor unit 18 Explanation of the sleep timer The device will control the FAN SPEED and
24. avoid noise interference please place the indoor unit and its remote controller at least 1m away from 4 prevent electrical products interference place at least 1m away cm 2 Na J 23 ATTACHING THE AIR CLEANSING AND DEODORIZING FILTERS Before installation be sure to stop the operation by using the remote controller 1 Open the front panel e Pull up the front panel holding it at both sides by both hands Front panel Remove the filter e Push the filter upward to release the claws Front cover and pull out the filter Air filter Claws Claws 8 places 3 Attaching the air cleansing and deodorizing filters to the filter e Attach the air cleansing and deodorizing filters to the frame by gently compress its both sides and release after insertion into filter frame L Make sure the FRONT is facing back side A CAUTION Do not bend the air cleansing and deodorizing filter as it may cause damage to the structure V Ss 4 Attach the filter Attach the filter by ensuring that the surface written FRONT is facing front After attaching the filter push the front panel at three arrow por
25. 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 Voltage between U transistor chopped U transistor ON and I5 260V 380V Chopping period Chopping period Upper arm transistor current at Fig 3 3 Voltage waveform at each point e When power is supplied Ut 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 When U transistor is OFF by inductance of motor coil U coil V coil V transistor Return diode Point Fig 3 4 68 Power module DC compressor motor DC current Id mew 1 detection resistor MP6501 Fig 3 4 Power module circuit Ut is ON V is ON e Since current flows at point B only when U transistor is ON the current waveform at point B becomes intermittent waveform as shown in Fig 3 3 Since current at point B 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 Table 3 1 Control P W B
26. fan motor Power switch STE Magnetic relay ES Power source 10 50Hz 220V Inrush current Protection circuit DC compressor motor DC current signal Rotor magnetic pole position detection circuit Trip signal Upper arm synthesiz circuit drive circuit Peak current cut off circuit Wireless receive circuit LCD wireless Peak current cut off Lower arm drive circuit Buzzer circuit circuit Room temperature thermistor Voltage amplification circuit Operation EE Indicating lamp Timer Dehumidifying Over heat thermistor Defrost thermistor Outdoor temperature thermistor Auto sweep motor for Air deflector Indoor Outdoor interface circuit Overload control Outdoor micro computer 8E21 i Heat exchanger pM Self diagnosis circuit temperature thermistor Indoor micro computer AX 7J03 Indoor Outdoor Temporary switch interface circuit Initial setting circuit DC fan motor drive mE circuit Relay drive circuit nm Reversing valve coil Clock circuit Power circuit Power circuit Reset circuit Indoor unit P W B Watch dag Micro computer clock Indoor fan motor circuit _ 39 BASIC MODE MODEL RAS 25CNH1 1 Operation mode Table 1 Cooling Dehumidifying Heating RAS 25CNH11 Data Source Required value of file name unit side 5400 4700
27. if indicator swings when and terminals 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 111 CHECKING THE REFRIGERATING CYCLE COMPRESSOR DEFECTIVE or AND Troubleshooting procedure No operation No heating No coolin Lighting mode Blinks Blinks Blinks Blinks Blinks Blinks 2times 3 times 4times 5times 6times 8 times Connect U V W phase leads to the power module again and operate the air conditioner LD302 Within ae approx i Approx Time until the 2 3 seconds 10 lamp lights ere seconds Possible malfunctioning Compressor ICompressor part Is the self diagnosis lamp mode as shown on the right 7 Blinking 1 Lit YES Normal 0 39 0 98MPaG 4 10kg cm G Stop to operate and check the gas Checking the power module pressure in balancing mode Gas leakage When the Less than 0 39MPaG self diagnosis lamp Less than 4kg cm G 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 Perform a final check of operation 112 PARTS LIST AND DIAGRAM MODEL RAS 25CNH11 MODE
28. it with a soft sponge After using neutral detergent wash thoroughly with clean water e When front panel is not removed wipe it with a soft dry cloth Wipe the remote controller thoroughly with a soft dry cloth e Wipe the water thoroughly If water remains at indicators or signal receiver of indoor unit it causes trouble Method of removing the front panel Be sure to hold the front panel with both hands to detach and attach it Removing the Front Panel Arm Projection Hole e When the front panel is fully opened with e Move the projections of the left and right both hands push the right arm to the inside arms into the Flanges in the unit and to release it and while closing the front panel securely insert them into the holes slightly put it out forward 90 CAUTION e Do not splash or direct water to the body of the unit when cleaning it as this may cause short circuit e Never use hot water above 40 benzine gasoline acid thinner or a brush because they will damage the plastic surface and the coating 26 CAUTION Cleaning and maintenance must be carried out only by qualified service personal Before cleaning stop operation and switch off the power supply 3 MAINTENANCE AT BEGINNING OF LONG OFF PERIOD e Run the unit by settin
29. temperature reaches 18 0 66 C Super Low fan operation will start again However during preheating or preheating after defrosting Super Low fan operation will not stop even if room temperature drops below 18 C Note 1 Refer to data in Table 1 in page 41 for each constant shown by capitital letters in the diagram 2 means minute and means second ex 30 50 in the diagram Reversing valve defrost More than 15 AUTO FRESH DEFROST k gt k More than DFTIM p m Fan speed Start Stop switch Hi setting Stop Defrost signal Preheating judgement Preheating OFF m Hi M Indoor fan sd Lo 4p n Super Lo L gt 13 Outdoor fan Lo o Operation laine Reversing valve Power ON mode in heating Defrost 30 Defrost Deceleration Period Ed period period Max 12 31 Max 3 3 Max 12 TDF TDF TDF 411 412 41 WMAX 3000 2400 1950 SGMNRP 0 Note DFTIM However first inhibit period is fixed at 40 ninutes The DEFROST inhibit period is DFTIM After DEFROST is completed defrost signal is not accepted for If the temperature difference between the room temperature and set temperature is great after the DEFROST is completed compressor can keep maximum rotation speed WMAX for up to 120 minuets com pleted DEFROST period is a maximum 12 minutes When o
30. thermostat OFF temperature during HOT dash operation is heating preset temperature including heating shift value SFTDSW 3 C and after the thermostat is turned OFF Hot dash is finished and the PI control starts 4 The minimum ON time of the compressor is 3 minutes and minimum OFF time is also 3 minutes 5 The compressor speeds in the fixed speed perids 1 and 2 after releasing the Hot dash maximum rotation Wtd1 and Wtd2 are determind as in Table 2 depending on the maximum rotation holding time td 6 The time limit to hold the maximum rotation WMAX of the compressor in the normal heating operation other than Hot dash is within 60 minutes when the room temperature is 18 C or more If the room temperature is less than 18 there is no time limit 7 During initial cycle operation preheating operation defrosting including balancing operation after defrosting or AUTO FRESH defrosting the operation lamp will blink at intervals of one second 8 Preheating operation is determined as follows preheating comes on when heat exchanger temperature lt YNEOF 0 66 C when operation is started with start stop switch preheating mode is released when heat exchanger temperature YNEOF Rotation speed of compressor is limited to the value of Rating for Heating WSTD 2000 2 or less in Low fan operation mode 10 In Super Low fan operation mode when room temperature drops below 18 indoor fan operation will stop When room
31. transfer output of the interface 84 11 Reset Circuit HIC 1 ZD301 Micro computer AX 8E21 Normal Hi Reset Lo Fig 11 1 Reset circuit performs initial setting of the microcomputer program before power is turned on Microcomputer resets program with reset voltage set to Lo and program can be operated with Hi Fig 11 1 shows the reset circuit and Fig 11 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 7 2V Zenor voltage of ZD501 ZD301 is turned ON Q2 and are turned ON and reset voltage input to pin 47 of microcomputer is set to Hi By 20501 reset voltage maintains input of pin 47 at Lo until Voo of microcomputer rises to 5V to obtain operable status e When power is shut off and potential of 12V is lowered ZD501 is shifted to OFF However since reset voltage is feed back to Q2 by R4 Q2 maintains ON state until 12V line voltage drops to about 7 6V This prevents reset voltage from chattering due to voltage change in 12V line 12V line 6 5V line Power is ON Voltage V Reset voltage Time 12V line Power is OFF Voltage V Reset voltage Fig 11 2 85 REFRIGERATING CYCLE DIAGRAM OUTDOOR UNIT SERVICE VALVE INDOOR UNIT 3 8 SINGLE ENDED UNION 3 8 COMPRESSOR SUCTION TANK REVERSING VA
32. 01 and C202 removes high harmonic components from the voltage generated from the DC current flowing to the detection resistor and R205 and C206 average the voltage and supplies it to OP1 pin s OP1 forms a non inverting voltage amp circuit together with the peripheral elements e The micro computer stores the set values which vary according to the rotation speed as shown in Fig 8 8 When the DC current level exceeds the set value the micro computer enters the overload control state The compressor motor is controlled in the same way as in external judgement described previously e The set Value is determined by the amplification of the voltage amp circuit Amplification high DC current low Amplification low DC current high 8 1 R229 R230 R231 detect the DC voltage at the power circuit The micro computer receives a DC voltage 210 300V via HIC 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 R229 R230 R231 are provided to perform the same overload judgement even when the voltage varies Amplification low DC voitage low DC current high Amplification 8 times DC current 260v t 5 Amplification high DC voltage high DC current low 0 0 Rotation speed Fig 8 8 During start current control gt It is required to maintain the sta
33. 013 FUSE 3A gt 32 2 909 FUSE 15A n2 PMRAC 25CNH11 906 CAPACITOR 80uF 420V PMRAS 07CH2 006 TERMINAL BOARD 2P 116 HITACHI RAS 25CNH11 RAC 25CNH11 PM NO 0164E Printed in Malaysia
34. 3 C 7 Controlled by heat exchanger temperature by heat by heat y exchanger temperature by heat 7 Lo 10 2 r 9 gt exchanger exchanger a exchanger 1250 4 66 C Super Lo temperature temperature A temperature 1350 5 00 C mm Reversing valve 1400min 5 33 C 1450min 5 66 C Operation lamp 1550min 6 00 C 1600min 6 33 C Maximum t EE ER 1650min 6 66 C Maximum WMAX 2 Fixed rotation c period 1 0 Rated value WSTD Fixed rotation 5 Wtd 2 3000 o WMIN 0 Outdoor fan Note 1 Conditions for starting Hot dash operation are as follows When the operation starts from the AUTO or fan speed or when the fan speed is changed to Hi during heating operation If the temperature difference between the room temperature with the compressor rotating at maximum speed and the set temperature is TWMAX refer to Table 2 and present room temperature is 10 C or less Hot dash will start 2 Conditions for releasing Hot dash operation compressor maximum rottion speed period are as follows D The limit time for compressor maximum speed operation is exceeded room temperature reaches the heating preset temperature including heating shift value SFTDSW The thermostat is turned OFF When Hot dash is released by above PI control starts without operating fixed speed periods 1 and 2 3 The
35. 3 DIODE AN R2 gi AN 0 Be YELLOW BLUE 5 YELLOW Reo p DICTOS RUSH CURRENT WF ame b Pp PROTECTION AN SMOOTHING AN 9 BROWN RED RCI CAPACITOR BLACK DIODE MIN ERE DIODE 1000F GRAY STACK A ae WHITE 6 WHITE D On 0 DC FAN MOTOR CONTROL MAIN A D GREEN 2A FUSE eis R DISCHARGE P W B WITCHIN SWITCHING 50m0 RESISTANCE L FAN MOTOR POWER CONTROLLER wi SUPPLY 1 ou RED WHITE b e WHITE um J GRAY mE YELLOW GRAY GRAY OUTDOOR TE NREVMALIE COIL TEMPERATURE DEFROST THERMISTOR THERMISTOR VELO BROWN i COMPRESSOR AWHITE A MOTOR 33 CIRCUIT DIAGRAM MODEL RAS 25CNH11 INDOOR FAN MOTOR
36. 340 5 1 16 8405 5 1K 25 17164 8406 5 1K 25 1 16W 8407 5 1 16w 8408 25 1 16w 404 5 1 16W R410 25 1 16w ee 8601 25 1 164 86031 10 5x 1 16w 8606 5x 1 16 8607 0K 5 1 16W 8608 5 Ji i6w Reoq IK 5 1 16 T uL T l1 5 58 ee p T SYMBOL RESISTANCE TOLERANCE alo e a 0 a w a 2 2 2 2 2 aja NJN eio N j Ww MIM Ww co RA AX e n c 0838688 lt m r Em lt lt H R a R a Q Ww w w 20 2 0 1004 50 103 0 ca e c p 0 201 33 107 2 206 0 10 257 aja Q lt 21 lt 210 ojo e OJOJOO N ojo JN B 30 302 303 ca JE 0401 0 10 257 601 0 1u 25v a 0 6702 1000 507 c N ca ca e wow 803 804 c 805 F C806 c C807 F 0403
37. ESSOR MOTOR Compressor Motor Specifications MODEL RAC 25CNH1 1 COMPRESSOR MODEL GR20DR2F PHASE SINGLE RATED VOLTAGE AC 220 240 V RATED FREQUENCY 50 Hz POWER SOURCE FOR COMPRESSOR Vcc max 360V POLE NUMBER CONNECTION RESISTANCE VALUE Q ORANGE CAUTION 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 31 WIRING DIAGRAM MODEL RAS 25CNH11 RAC 25CNH1 1 Indoor unit AC 220V 50HZ X ue BOARD CONNECTING CABLE BROWN BROWN M BLUE N BLUE 5 A BLACK A BLACK GREC POWER SWITCH FUSE 76 C WHITE 5 YELLOW ROC MSS NS BROWN C BROWN E HEAT EXCHANGER Dj BOARD GREEN 7 YELLOW CN10 ROOM RED INDOOR FAN MOTOR THERMISTOR LIGHT TERMINAL BOARD RECEIVING i CN2 CN4 CONNECTING UNIT STEPPING MOTOR WIRELESS 123 1234 REMOTE CONTROL 4 EA RED zi E SINE GREEN 10 YELLOW TIE CAUTION The marked parts are very important ones for safety Outdoor unit FUSE pig STICK RELAY 1
38. G INITIALIZE DOWNWARD MAIN SWITCH OFF DURING OPERATION EACH MODE STOP DURING SWINGING DURING INITIALIZING ONE SWING CLOSING AIR DEFLECTOR DOWNWARD 0 UPWARD INITIALIZE AT NEXT OPERATION CHANGE OF OPERATION DURING OPERATION EACH MODE STOP INITIALIZING CONDITION OF EACH MODE DURING SWINGING STOP SWINGING AND MODE BECOMES INITIALIZING CONDITION DESCRIPTION MAIN CIRCUIT OPERATION Model RAS 25CNH11 1 Reset Circuit 35V 5V 5V 12V 5V Q202 NORMAL gt RESET gt LO COMPUTER Fig 1 1 Voltage 35V DC line DAY I 2 4 4 i 5V DC line BV i Base of Q201 AME 4 PowerisON Power is OFF Collector of Q202 Fig 1 2 e The reset circuit initializes the program when power is supplied or power is restored following a power failure e RESET Lo or SET activates the micro computer e Fig 1 2 shows the waveforms in each circuit when power is ON and OFF e When the power is supplied the voltages on the 35V and 5V DC lines rise and when the 35V DC line becomes approx 24V ZD201 turns on and the voltage at the base of Q201 rises to turn Q201 on Since the collector of Q201 goes Lo at this time Q202 turns on and the reset input of the micro computer goes Hi The 5V DC line has already been 5V at this time and the
39. HITACHI RAS 25CNH11 SERVICE MANUAL RAC 25CNH11 TECHNICAL INFORMATION REFER TO THE FOUNDATION MANUAL FOR SERVICE PERSONNEL ONLY CONTENTS SPECIFICATION 4 SAFETY PRECAUTION do DM ML MEE 6 EL h HOW TOUSE ene ene ee ae 8 f CONSTRUCTION AND DIMENSIONAL DIAGRAM 29 MAIN PARTS COMPONENT 30 RAS 25CNH11 WIRING DIAGRAM ueniet 33 CIRCUIT DIAGRAM eir etre 35 BLOCK DIAGRAM 39 55555 BASIC MODE 41 gt AUTO SWING FUNCTION 54 EE 655555 DESCRIPTION OF MAIN CIRCUIT OPERATION 55 1 REFRIGERATING CYCLE DIAGRAM 86 gt SEAVICE CALUO esee ee 87 RAC 25CNH11 TROUBLE SHOOTING a a 91 SPECIFICATIONS PARTS LIST AND DIAGRAM seats areca 113 WALL TYPE INDOOR UNIT OUTDOOR UNIT MODEL RAS 25CNH11 RAC 25CNH11 POWER SOURCE 10 220V 50Hz TOTAL INPUT 910 190 1 150 COOL 1 250 160 1 350 HEAT TOTAL AMPERES RATED MAX 4 20 3 85 COOL 5 75 5 25 HEAT 2 50 0 90 2 80 8 870 3 070 9 550 3 60 0 90 4 00 12 280 3 070 13 650 TYPE COOLING CAPACITY HEATING CAPACITY DIMENSIONS
40. IN CAUTION BE SURE TO CHECK THAT POWER SWITCH IS TURNED OFF BEFORE SERVICING NOTE 1 LD301 BLINKING 9 TIMES MODE OCCURS NOT ONLY BECAUSE INTERFACE CIRCUIT OF COMMUNICATIONS ERROR BUT ALSO WHEN FALL SIGNAL IS SENT TO INDOOR UNIT 8 TIMES WITHIN 30 MINUTES CHECK WHETHER OR NOT DEHUMIDIFYING LAMP ON INDOOR UNIT IS BLINKING SERVICE ONLY BLINKS WHEN LOW FREQUENCY SYNC STARTS 5 OUTDOOR P W B OPERATION 8 SERVICE SWITCH THE FORCED COOLING OPERATION ON AND OFF ARE REPEATED AT BLINKING INTERVAL OF 0 25 SEC IN BLINKING 2 DURING STOP 0903 RED GOES OFF NORMAL INDOOR THERMOSTAT OFF STOP MAIN OPERATION OFF NOT MALFUNCTION CONTROL P W B POWER CIRCUIT MICROCOMPUTER ETC 0 POWER MODULE 2 COMPRESSOR 38 CONTROL P W B POWER MODULE RESSOR CONTROL P W B DRIVE CIRCUIT POSITION DETECTION CIRCUIT ETC POWER MODULE 2 COMP RESSOR CONTROL P W B DRIVE CIRCUIT POSITION DETECTION CIRCUIT ETC OUTDOOR UNIT IS EXPOSED TO DIRECT SUNLIGHT OR ITS AIRFLOW BLOCKED 2 MOTOR 3 FAN MOTOR CIRCUIT 1 LEAK OF REFRIGERANT 2 COMPRESSOR 3 THERMISTOR CIRCUIT OH THERMISTOR 2 CONNECTION OF THERMISTOR DEFECTIVE 3 THERMISTOR CIRCUIT 1 LEAK OF REFRIGE RANT 2 COMPRESSOR INCORRECT CONNECTION OF CABLES 2 DISCONNECTION OF CABLE 3 INDOOR OUTDOOR IN
41. ING CORD AIR INLET BACK LEFT SIDE AIR OUTLET MODEL NAME AND DIMENSIONS MODEL WIDTH mm HEIGHT mm DEPTH mm RAS 25CNH1 1 745 248 175 RAC 25CNH1 1 700 570 210 y OPERATION INDICATOR POWER SWITCH INDOOR UNIT INDICATORS TEMPORARY SWITCH Use this switch to start and stop when the remote controller does not work e By setting the temporary switch the operation is done in previously set operation mode e When the operation is done using the temporary switch after the power source is turned off and turn on again the operation is done in automatic mode OPERATION LAMP This lamp lights during operation The OPERATION LAMP flashes in the following cases during heating 1 During preheating For about 2 3 minutes after starting up 2 During defrosting Defrosting will be performed about once an hour when frost forms on the heat exchanger of the outdoor unit for 5 10 minutes each time TIMER LAMP This lamp lights when the timer is working SIGNAL RECEIVER There will be a beep sound when this receiver receives signal from remote controller NAMES AND FUNCTIONS OF REMOTE CONTROL UNIT REMOTE CONTROLLER This controls the operation of the indoor unit The range of control is about 7 meters If ind
42. L RAS 25CNH11 PART NO RAS 25CNH11 z o Q TY UNIT PARTS NAME PMRAS 25CNH2 001 CABINET PMRAS 25CNH2 002 LOW COVER PMRAS 25CNH2 003 20W MOTOR PMRAS 25CNH2 004 TANGENTIAL FLOW FAN PMRAS 25CNH2 005 P BEA ASSEMBLY PMRAS 25CNH2 006 BEARING COVER PMRAS 25CNH2 007 FAN MOTOR SUPPORT PMRAS 25CNH2 008 ELECTRICAL COVER PMRAS 25CNH2 009 DRAIN PAN ASSEMBLY d o Il NI OD oO amp PMRAS 25CNH2 010 DRAIN HOSE PMRAS 25CNH2 011 FRONT COVER ASS Y PMRAS 25CNH2 MOUNTING PLATE PMRAS 25CNH2 REMOTE CONTROL gt PMRAS 25CNH2 EVAPORATOR PMRAS 25CNH2 UNION 2 PMRAS 5100C UNION 3 N PMRAS 25CNH2 STEP MOTOR PMRAS 25CNH2 REMOTE CONTROL HOLDER pare PMRAS 25CNH2 FILTER PMRAS 25CNH2 CAP PMRAS 25CNH2 PIPE SUPPORT PMRAS 07CH2 TERMINAL BOARD 2P co PMRAS 10C6M SWITCH POWER PMRAS 25CNH1 1 P W B MAIN PMRAS 25CNH2 THERM FUSE PMRAS 25CNH2 THERMISTOR 114 MODEL RAC 25CNH11 e 4 AQ 115 MODEL RAC 25CNH11 PART NO RAC 25CNH1 1 z o Q TY UNIT PARTS NAME RA 226 015 O L R COVE
43. LVE HEATING CAPILLARY SINGLE ENDED CHEK UNION 1 4 VALVE HEATING CAPILLARY HEATING OUTDOOR UNIT SERVICE VALVE INDOOR UNIT rz 3 8 SINGLE ENDED m UNION 3 8 S 5 SUCTION 2 TANK REVERSING VALVE Ss HEATING CAPILLARY THD IL SINGLE ENDED T CHEK pop UNION 1 4 PIPE VALVE HEATING CAPILLARY 86 SERVICE CALL Q amp MODEL RAS 25CNH11 RAC 25CNH11 Cooling operation The compressor has stopped suddenly during cooling operation Cool air is blown in the dehumidifying mode The operation is not stopped when the preset room temperature is changed higher us ing the remote controller during dehumidifying operation Though the preset room temperature is set higher than actual room temperature using the remote controller dehumidifying operation is done Check if frost has formed on the indoor unit heat exchanger Wait 3 4 minutes until it is If the air conditioner operates in the cooling mode when it is cold frost may form on the heat defrosted exchanger of the indoor unit The fan speed is fixed at Lo in the dehumidifying mode This is for higher dehumudifying efficiency It is not a maifunction The de
44. MODEL RAS 25CNH11 RAC 25CNH1 1 usd Does the timer or dehumidifying lamp on See when the timer lamp the indoor unit blink J chock ne outaoor erecricatpans 0 the outdoor electrical chock ne outaoor erecricatpans 0 Set to room temperature 16 C in the cooling mode or to 32 C in the heating Dehumidifying mode and press the start stop button lamp Remove the decorative cover and electrical parts cover and check the pin voltages of CN3 brown and red wires Pin 5 35 V 3 OV Does the operation lamp on the indoor unit start to light or blink i No 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 Service switch Is approx 35V DC being generated Is the polarity correct No Yes Check to see whether the F cable is connected incorrectly 9 or disconnected Does LD301 blink one time Normal Repeats 0 25 second on and 2 second off Blinking other One time blinking than one time Set the service switch on the outdoor unit to cooling Does the compressor operate After Yes checking be sure to return the service switch to normal See Outdoor unit self diagnosis lamp lightin
45. R RA 226 016 COVER SUPPORT PMRAC 05CV 901 FAN MOTOR SUPPORT PMRAC 25CNH2 901 20W MOTOR PMRAC 25CNH2 902 PROPELLER FAN PMRAC 25CNH11 904 CABINET PMRAC 05CV 905 ELECTRICAL COVER ASSEMBLY PMRAC 05CV 906 SIDE PLATE R Od k PMRAC 05CV 907 SIDE PLATE L PMRAC 05CV 908 HANDLE PMRAC 05CV 909 GRILL 25 11 905 INVERTER COMPRESSOR gt RAC 2226HV 805 COMPRESSOR RUBBER k KPNT1 001 PUST NUT PMRAC 25CNH2 905 CONDENSER N PMRAC 07CHV1 904 2S VALVE PMRAC 05CV 914 3S VALVE pare PMRAC 07CHV1 920 REVERSING VALVE PMRAC 07CHV1 921 COIL REVERSING VALVE PMRAC 07CHV1 922 CHECK VALVE PMRAC 25CNH2 906 5 PMRAC 25CNH2 907 SILENT COVER PMRAC 25CNH2 908 THERMISTOR NJ PMRAC 25CNH2 909 THERMISTOR OH SUPPORT 25 2 910 THERMISTOR PMRAC 25CNH2 911 THERMISTOR SUPPORT co PMRAC 25CNH11 903 SMOOTHING CAPACITOR 100042 420V e PMRAC 25CNH11 902 COIL ASSEMBLY REACTOR k PMRAC 25CNH2 914 DIODE STACK PMRAC 25CNH11 901 MAIN PMRAS 5100C
46. TERFACE CIRCUIT WHEN STOPPED WITH POWER RESET NORMAL WHEN POWER HAS BEEN TURNED ON OVERCURRENT IS DETECTED RESET STOP PEAK CURRENT CUT ABNORMAL LOW SPEED ROTATION SWITCHING FAILURE OVERLOAD LOWER LIMIT CUT OH FIN THERMISTOR TEMP RISE THERMISTOR ABNORMAL POSITION DETECTION SIGNAL IS NOT INPUT DURING OPERATION SWITCHING FROM LOW FREQUENCY SYNC START TO POSITION DETECTION OPERATION FAILURE UNDER THE LOWER LIMIT OF ROTATION SPEED WITH OVERLOAD CONTROL CIRCUIT OPERATED OH THERMISTOR OR FIN THERMISTOR IS OPERATED THERMISTOR IS OPEN OR SHORTED OH OUTER TEMPERATURE DEF THERMISTOR NO ACCBLERATION OVER THE LOWER LIMIT OF THE ROTATION SPEED COMMUNICATIONS STOPPED ACCELERATION DEFECTIVE COMMUNICA TIONS ERROR ABNORMAL 1 POWER VOLTAGE 2 CONNECTION OF REACTOR POWER VOLTAGE IS ABNORMALLY LOW 2 SEC OF LIGHTS FOR 0 25 SEC AT INTERVAL OF 0 25 SEC 97 Is AC 220V voltage being generated between terminals A and B of the terminal board NO gt Is 220V voltage being generated at power outlet NO Check power outlet and breaker and repair defective parts YES YES 5 Is DC 35V voltage generated between terminals C and D of the terminal board
47. TION selector so that the display indicates HEAT Set the desired FAN SPEED with the 4 FAN SPEED button the display indicates the setting AUTO The fan speed is at first and varies to MED automatically when the preset temperature has 2 been reached as the room will become warm quickly But you may feel a chill at the beginning MED Quiet LOW More quiet Set the desired room temperature with the TEMPERATURE buttons the display indicates the setting em 3 pes The range of 18 22 is recommended as the lI room temperature for heating If the temperature setting is 20 the room temperature will be controlled at around 20 C temperature setting and the actual room temperature may vary somewhat depending on conditions Press the 1 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 have to press the D START STOP button next time 12 DEHUMIDIFYING OPERATION Use the device for dehumidifying when the room temperature is over 16 When it is under 15 the dehumidifying function will not work HITACHI Press the START STOP button Dehumidifying operation starts with a beep Press th
48. When the thermostat is turned OFF the shifting of the preset temperature in Cool rhythm operation is done 47 Basic heating operation Table 1 Speed specification during fixed rotation period Sid y Atd Hot dash time Wid Less than 10 minutes 2150min 1700min 9 o 10 minutes to less than 20 minutes 3150min 2500min 9 S 20 minutes or more 4150 3300min Preset temperature for heating SHIFTW 18 C Table 2 ATWMAX Max speed WMAX Preset temp including Min speed WMIN shift temp 650 1 66 C AUTO fan mode is setting 750 2 00 C mm 5 stop Barm 233C Start Stop Switch Thermostat Thermostat OFF 850min 2 66 C Thermostat judgement F Hw Defrost signal 3 max ES Thermostat OFF reneating release Preheating judgement Preheating released g 1000min 3 33 C Super Hi 30 30 30 1050 3 66 C ELI Hi I d m 1150 4 00 Indoor an Med gt 15 45 a 15 Controlled by heat 15 Controlled alla 75 1200min 4 3
49. YPE P 105 VK1 5m P 108 VK1 8m The Length of Indoor Unit Connecting Cord about 0 9m about 1 6m Cut away shaded portion and finish the edge of the opening so that there is no burr Direction of Piping Horizontally 77771200 perpendicular ZA SITTER ESS to the unit lt There are 3 directions allowed namely horizontally perpendicular to the unit vertically down from right horizontally out from right Don t form the piping downward at the left of the unit Dimension of Mounting Stand of the outdoor unit unit mm mounting stand Pus above 100mm 3 above 300mm above 200mm above 50mm when A installed on the ceiling of balcony Figure showing the Installation of Indoor and Outdoor Unit Be sure to completely above 50mm seal any gap with putty E eo o gt o 5 e above 100mm above 100mm N Used in horizontal piping 2 500mm or more must not bend about 0 45m The indoor piping should be insulated with the enclosed insulation pipe If the insulator is insufficient please use commersial products Maximum pipe length 8m e The difference in height between the indoor and outdoor unit should be kept below 5m The connecting pipe no matter big or small should all be 3 ab
50. ad on the air conditioner increases to an overload state in order to protect the compressor electronic components and power breaker e Overloads are judgement 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 rotation speed programmed in the micro computer software with the DC current value AX 8E21 Micro computer To power module 5 negative terminal 5 Judgement OVL o Silay t with respect to Motor control externa y externally set process R806 value circuit Valid External judgement Voltage amp circuit Internal judgement Detection resistor Judgement OVL according to the rotation Speed Rotation speed data Selects data according DC voltage 71 to the rotation speed and DC voltage 1 1 1 1 1 OVL start current data 1 1 1 Fig 8 4 Overload Control System Configuration External judgement value DC current Judgement value according to the rotation speed internal judgement value Rotation speed Fig 8 5 1 Overload external judgement circ
51. as been selected the device will automatically determine the mode of operation HEAT COOL or DEHUMIDIFY depending on the initial room temperature Press the D START STOP button Operation starts with a beep Press the button again to stop operation E W As the settings are stored in memory in the remote controller you only have to press the START STOP button next time You can raise or lower the temperature setting as necessary by maximum of Press the temperature button and the temperature setting will change by 1 C each time The preset temperature and the actual room temperature may vary somewhat depending on conditions The display does not indicate the preset temperature in the AUTO mode If you change the setting the indoor unit will produce a beep J Initial room temperature Function Temperature setting FAN SPEED HI at start MED or LOW Over 27 C gt COOL 27 after the preset temperature is reached Slightly lower than the dodi DERMMIDIEY room temperature d HI at start MED or LOW Under 23 23 after the preset temperature is reached edes HEATING OPERATION e Use the device for heating when the outdoor temperature is under 21 C When it is too warm over 21 the heating function may not work in order to protect the device Press the FUNC
52. ater 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 80 and with the air deflector facing down or moving automatically for a long period of time water will condense on the air deflector and drips down occasionally This will wet your furniture Therefore do not operate under such condition for a long time elf 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 NAMES AND FUNCTIONS OF EACH PART INDOOR UNIT Air filter To prevent dust from coming into the indoor unit Refer page 25 HIT Jl VI Indoor unit indicators Light indicator showing the operating condition Refer page 9 Front panel Air Inlet Horizontal deflector e Vertical deflector Air Outlet Refer page 20 Remote controller Send out operation signal to the indoor unit So as to operate the whole unit Refer page 10 DRAIN PIPE Condensed water drain to outside CONNECT
53. data is transferred from the outdoor microcomputer to the indoor microcomputer e Indoor micro computer to outdoor micro computer The communications from the indoor micro computer to the outdoor micro computer are the same Fig 2 3 shows the voltages and waveforms at each circuit 64 e Fig 2 1 shows the interface circuit used for the indoor and outdoor micro computers to communicate with each other C801 R802 C802 computer IF transmit Outdoor P W B Inpoor P W B pr o V F35V 43 4 0 5V 1O 1701 R702 4 ER IF transmit C701 R703 Output 500 Micro OV computer AX 8E21 5V po IF receive OV a R704 G D 709 dn C706 Noise filter C710 coil Ov OV C708 GND Communications from indoor micro computer to outdoor micro computer Communications from outdoor micro computer to indoor micro computer Fig 2 1 Indoor outdoor interface Circuit 65 Outdoor HIC 9 5 MEL S 5V HU di Indoor micro computer 5 5V oV 9 Pin 5 5V MV vw s 2 1 100 ms 33ms Leader 1frame Fig 2 2 Voltages Waveforms of indoor Outdoor Micro computers Outdoor to Indoor Communications Outdoor Pin 5V OV 5 Pin 5V T yU ui Indoor micro c
54. dule pe PQ501 922 R504 R507 os 7 A phase e vate D502 cso1 PQ501 PC922 R508 v d B phase Devt D503 D504 2 C502 PQ503 PC922 R508 R509 w p 1 C phase 0505 0506 A cso Fig 7 1 Forward Current at point A current Oa Fig 7 2 Forward Current Waveform at Point 4 e When pin of HIC goes Hi Lo a photocoupler between PQ501 pins 1 and 2 turns on and current flows to terminal d R501 PQ501 R504 power module s But terminals Eu terminals D502 D501 terminal e and drives the upper arm transistors Fig 7 2 e As described in the rotor magnetic pole position detecting circuit the upper arm drive circuit supplies current to the bases of the transistors on the power module s positive side which turn on or off according to the position detection signals The signals according to the position detection detection signals are output from pins Q3 and of the micro computer and are input to pins 2 of photocouplers PQ501 PQ503 via driver 75 e When of HIC 1 then goes Lo photocoupler between 2 pins turns off and the reverse bias current flows to C501 power module s Eu terminals But terminals R504 PQ501 Switching incomplete to cut off the upper arm transistors Fig 7 3 D401 D402 Power module
55. e button again to stop operation Press the FUNCTION selector so that the display indicates DEHUMIDIFY The FAN SPEED is set at LOW automatically The FAN SPEED button does not work Set the desired room temperature with the TEMPERATURE button the display indicates the setting Ll The range of 20 26 C is recommended as the L de E E room temperature for dehumidifying V As the settings are stored in memory in the remote controller you only have to press the START STOP button next time 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 13 COOLING OPERATION Use the device for cooling when the outdoor temperature is 22 42 C If in doors humidity is very high 8096 some dew may form on the air outlet grille of the indoor unit HITACHI Press the FUNCTION selector so that the display indicates COOL Set the desired FAN SPEED wit
56. efective gt 15 the power module normal Replace the power module LD301 Blinks 7 times Thermistor abnormal Perform continuity check of the leads and pattern according to the P W B diagram and circuit dia gram Is the micro computer drive circuit Repl i PS HIC normal eplace defective parts Is the connector of the thermistor YES disconnected Be careful not to forget to re connect after servicing Connect the thermistor connector Is the continuity of thermistor normal Replace the thermistor YES Perform continuity check of the leads and pattern according to the P W B diagram and circuit diagram Replace parts in the thermistor Is the thermistor circuit normal circuit 801 LD301 Blinks 6 times OH thermistor temperature rises LD301 Blinks 5 times Overload lower limit cut LD301 Blinks 4 times Switching failure LD301 Blinks 3 times Abnormally low rotation speed Leakage of refrigerant or compressor defective Are position detection circuit and drive circuit PS HIC normal Replace parts in the thermistor circuit Replace defective parts Replace the power module Replace defective parts Check the continuity of replaced parts Perform continuity check of the leads and pattern accordin
57. er OFF TIMER button Select the turn OFF time ON TIMER button Select the turn ON time RESERVE button Time setting reservation C5 AUTO CANCEL button Cancel time reservation HEAT DEHUMIDIFY Precautions for Use a Do not put the remote controller in the following places o Under direct sunlight SLEEPING e In the vicinity of a heater STOP CANCEL 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 ME cord and plug it in again TIMER SET This is to protect the device and does not indicate a failure TIMER SELECTOR S Honen f you press the FUNCTION selector button during operation the p OTR device may stop for about 3 minutes for protection x AUTO SWING 10 AUTOMATIC OPERATION varies The device will automatically determine the mode of operation HEAT COOL or DEHUMIDIFY depending on the initial room temperature The selected mode of operation will not change when the room temperature HITACHI Condition of Automatic Operation Press the FUNCTION selector so that the display indicates the AUTO mode of operation When AUTO h
58. eration 7 Operation completely stops within a few seconds minutes after starting All displays also go off Check if pattern of P W B is not short circuit Is it possible to turn indoor fan by hand easily turn power switch off Check if indoor fan is touching the chassis before checking etc If it is correct it Replace indoor fan 101 CHEKCING THE REMOTE CONTROL SWITCH Is battery polarity right Install the battery in the right polarity Yes Does transmission mark light for an in stant when the button is pressed Replace the battery Turn on an AM radio bring the remote control switch within 15 cm of the radio and press the Start Stop switch Does the radio buzz noisily Check the LED D1 with a multimeter Yes Within 15 cm Check the remote control signal receiving P W B If itis good check the main P W B AM radio Check functions again If it does not work replace the remote control switch 102 You can check the remote control switch by other methods as explained below 1 Using a video monitor Connect a video camera to a TV and aim at the remote control switch If infrared rays are emitted from the switch you will see a flash in violet on the monitor screen Video camera Remote control switch 2 Using a Checker You can make a checker by yourself Its circuit diagram is shown below Regulated p
59. et only one of the OFF timer ON timer and ON OFF timer 16 2 Press the TIME button Pos C ly Un s M MI Example The current time is 1 30 p m 3 Set the current time with the TIMER control button 4 Press the C TIME button again The time indication starts lighting instead of flashing sl The time indication will disappear e PON b automatically in 10 second sn PAUCA SIE To check the current time setting PM IL press the TIME button twice The setting of the current time is now complete p x 2s the turn off time with the 3 Point the signal window of the remote controller toward the indoor unit and TIMER control button press the RESERVE button ge The OFF mark starts lighting instead of flashing and the sign RESERVED 5 HB lights A beep occurs and the C TIMER lamp lights on the indoor unit Vj i an Q Example The device will turn off at 11 00p m The setting of turn off time is now complete J N 25 the turn on time with the TIMER control button 3 Point the signal window of the remote controller toward the indoor unit and press the RESERVE button The ON mark starts lighting instead of flashing and the RESERVED sign lights A beep occurs and the C TIMER lamp lights on the indo
60. g mode Check the refrigerating cycle Check the outdoor electrical parts Check the indoor electrical parts 94 TROUBLE SHOOTING WHEN THE TIMER and DEHUMIDIFYING LAMP BLINKS MODEL RAS 25CNH11 Perform trouble shooting according to the number of times the timer lamp on the display of the indoorunit blinks Blinking made of timer lamp Reason of indication Possible caues 2 times 5 sec Ha 10times 5 13 times Reversing valve defective When the indoor heat exchanger temperature is too low in the heating mode or it is too high in the cooling mode Outdoor unit forced operation When the outdoor unit is in forced operation or balancing operation after forced operation Indoor unit outdoor unit interface defective When the interface signal from the outdoor unit is interruppted Outdoor unit electrical components defective When the same error mode is detected 8 times within 30 minutes from outdoor unit electrical components However when error is detected 8 times within two hours only for outdoor thermistor Over current detection at the DC fan motor When over current is detected at the DC fan motor of the indoor unit 401 data reading error When data read from IC401 is incorrect lights for 0 5 sec at intervals of 0 5 sec blinks 9 times connection once again 95 1 Reversing valve defective 2 Heat exchan
61. g or dehumidifying operation is set the unit performs heat running operation for 1 minute In the heating operation the operation lamp blinks for this period is not malfunction 90 TROUBLE SHOOTING Model RAS 25CNH11 RAC 25CNH11 PRECAUTIONS FOR CHECKING Power source from an indoor unit 1 220V 50Hz c Outdoor unit electric parts 1 Remember that the OV line is biased to 155 170V in reference to the ground level Compressor Indoor unit motor j lectri t Also mote that it _ parts takes about 10 minutes until the voltage fall after the power switch is turned off Across 8 b 0V line approx 311 260V Across a ground approx 1311V Across 6 OV line ground approx 311V Always keep your hands and metallic things away from the enclosure of the DANGER oscilloscope Don t install the ground Oscilloscope 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 91 DISCHARGING CAPACITORS 1 Turn off the indoor unit s power switch or unplug the power cord and wait for a minute or so 2 Open the cover of the electric parts compartment Discharge electricity from smoothing capacitors 1 000uF by connecting the leads of a soldering iron of 30 75W to the terminals provided for this purpose Continue discharging for more than 15 seco
62. g the operation mode to io COOL the temperature to 32 and the fan speed lt to HI for about half a day a fine day and dry the whole of the unit Air e Switch off the power plug 1 Ne P REGULAR INSPECTION PLEASE CHECK THE FOLLOWING POINTS BY QUALIFIED SERVICE PERSONAL EITHER EVERY HALF YEARLY OR YEARLY CONTACT YOUR SALES AGENT OR SERVICE SHOP N 1 Q9 Is the earth line disconnected or broken Ca 5 F 2 Is the mounting frame seriously affected by rust and is the 2 id outdoor unit tilted or unstable Is the plug of power line firmly plugged into the socket 3 Please ensure no loose contact between them V J 07 AFTER SALE SERVICE AND WARRANTY WHEN ASKING FOR SERVICE CHECK THE FOLLOWING POINTS CONDITION CHECK THE FOLLOWING POINTS e 15 the fuse all right When it does not operate e the voltage extremely high or low e 5 the circuit breaker ON Was the air filter cleaned Does sunlight fall directly on the outdoor unit Is the air flow of the outdoor unit obstructed Are the doors or windows opened or is there any source of heat in the room e 15 the set temperature suitable When it does not cool well When it does not hot well S Notes e quiet operation or stopping the operation the following phenomena may occassionally occur but the
63. g 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 N e Do not attempt to operate the unit with wet hands this could cause fatal GNE accident e When operating the unit with burning equipments regularly ventilate the 3 3 Q Y room to avoid oxygen insufficiency e e Do not direct the cool air coming out from the air conditioner panel to face household heating apparatus as this may affect the working of apparatus such as the electric kettle oven etc e Please ensure that outdoor mounting frame is always stable firm and without defect If not the outdoor unit may collapse and cause danger e Do not splash or direct water to the body of the unit when cleaning it as this may cause short circuit e Do not use any aerosol or hair sprays near the indoor unit This chemical can adhere on heat exchanger fin and blocked the evaporation water flow to drain pan The water will drop on tangential fan and cause water splashing out from indoor unit 2 e Please switch off the unit and turn off the circuit breaker during cleaning the e high speed fan inside the unit may cause danger e Turn off the circuit breaker if the unit is not to be operated for a long period 69 8 e Do not climb on the outdoor unit or put objects on it e Do not put w
64. g to the P W B diagram and circuit dia gram 601 LD301 Blinks 2 times Peak current cut LD301 Blinks 1 times Reset stop Is the power module normal Replace the power module YES Is the drive circuit normal Replace defective parts YES Are R804 CHOP HIC and peripheral Circuits normal Is IP input signal of the micro Replace defective parts computer normal Pin 2 of the micro computer is approx 5V in the normal state Is the reset circuit normal Pin the micro computer is i 5V in the normal state Replace detective parts Operate the air conditioner again Does it operate normally Perform a final check of operation Method for diagnosis of power module COLECTER Circuit diagram of the device excepting the reflux diode EMITER Circuit diagram of the module Terminals symbol mark of the module See next page for measuring value using tester 110 How to check Power module Checking power module using tester Set tester to resistance range x100 If indicator does not swing in the following conductivity check the power module is normal In case of digital tester since built in battery is set in reverse direction and terminals are reversed If inner circuit of power module is disconnected open the indicator of tester will not swing and this may assumed as normal In this case
65. ger thermistor disconnected only in the heating mode Electrical parts in the outdoor unit 1 Indoor unit interface circuit 2 Outdoor unit interface circuit 1 Indoor unit fan motor 2 Outdoor unit electrical components For details operate again using remote controller and check from self diagnosis display of outdoor unit 1 Indoor unit fan lock 2 Indoor unit fan motor 3 Indoor unit control P W B 401 abnormal If the interface circuit is defective when the power is turned ON the self diagnosis indication is not displayed When indoor unit is performing self diagnosis operation shown above self diagnosis lamp of the outdoor unit If the indoor unit cannot be operated at all check the connection of the F cable reverse connection or dis When timer lamp or dehumidifying lamp blinks remote control can be used to operate for checking operation 2 Outdoor unit judging between electrical parts of the condensing unit and refrigerating cycle MODEL RAC 25CNH1 1 Remove the compressor Connecting connector Compressor connecting connector d E S E 40 D S Q o o pun a E E YW 4 on E e Check the drive circuit If checking cannot be Set to the operation mode and using the drive checker LE Bs rua pios press the Start Stop Switch e Power module later re start check the Does t
66. h ends of R802 the control P W B using a tester etc 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 Fig 1 3 connection of test equipment terminals The circuit board could be damaged DC voltage approx 260 290V during operation 4 Smoothing capacitor This smoothes averages the voltage rectified by the diode stacks A DC voltage is generated in the same way as in Fig 1 3 5 C805 C808 C812 C813 1804 NF These 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 3 These absorbs external power surge 7 Inrush protective resistor R807 This works to protect from overcurrent when power is turned on R807 Short circuit Overcurrent flows in rush protection ON mode Open Overcurrent flows with power relay turned ON damaged each time power relay is turned ON Diode stack and 15A fuse deteriorate Reference gt e When inrush protective resistor is defective diode stack may malfunction As a result DC voltage is not generated and no operation can be done 63 2 Indoor Outdoor Interface Circuit e interface circuit superimposes an interface signal on the 36V DC line supplied from the outdoor unit to perfom communications between indoor and outdoor units This ci
67. h the FAN SPEED button the display indicates the setting ty AUTO The FAN SPEED is at first and varies to MED automatically when the preset temperature has been reached lt Economical as the room will become cool quickly MED Quiet LOW More quiet 4 Press the D START STOP button Cooling operation starts with a beep Press the button again to stop operation The cooling function does not start if the temperature setting is higher than the current room temperature even though the D OPERATION lamp lights The cooling function will start as soon as you set the temperature below the current room temperature lt Set the desired room temperature with the TEMPERATURE button the display indicates the setting HITACHI 7 1 The range of 25 28 is recommended as the lec room temperature for cooling If the temperature setting is 27 C the room temperature will be controlled at around 27 C n Mi The temperature setting and the actual room temperature may vary some how depending on conditions Ne As the settings stored memory in the remote controller you only have to press the D START STOP button next time 14 FAN OPERATION You can use the device simply as an air circulator Use this function to dry the interior of the indoor unit at the end of summer HITACHI
68. he Fan current detection circuit 35V line current is detected by R906 R915 and input to fan current detection pin Microcomputer detects overcurrent comparing it with the current judgment value corresponding to the fan rotation speed 59 PWM output Voltage at Voltage at J Output voltage E Fig 8 2 Fan Motor Set Wind Velocity and DC Voltage between blue and red Characteristics Fan Speed Connector blue red voltage V Rotation Speed min o 2 oc lt HEATING SS 9 8 714 S 16 6 950 OVERLOAD 19 1 1 040 LO 19 1 1 040 HI 27 7 1 350 SUPER HI 27 7 1 350 COOLING S 16 0 930 LO 18 7 1 020 HI 20 9 1 100 SUPER HI 20 9 1 100 DEHUMIDIFYING 60 9 12V Power Circuit 35V R101 12V Fig 9 1 e DC 35V supplied from the outdoor unit is controlled by switching of regulator 1 and is smoothed by D102 L102 and C102 to produce 12V e Output voltage is divided by R102 and R103 and input to output dividing pin 5 to control switching so that output voltage is 12V Waveform at Waveform at Out put Voltage Fig 9 2 61 Model RAC 25CNH11 1 Power Circuit SET eee ee Diode stack Reactor board I Surge Inrush current absorber 59 protection relay Power modu
69. he operation starts about 1 e Check the position detection circuit Normal 3 Check the Refrigerating cycle lighting condition of the min or more LD 303 lights is self diagnosis lamp again mormal No Check the electrical parts in the condensing unit 96 MODEL RAC 25CNH11 3 LIGHTING MODE IN THE OPERATION WITH COMPRESSOR LEAD DISCONNECTED SELPDIAGNOSIS LIGHTING MODEM LIT LHI NAME DETAILS MAIN CHECK POINT 1 DISCONNECT THE CONNECTORS OF THE LEAD CONNECTED TO THE COMPRESSOR 2 SET TO THE OPERATION MODE AND PRESS THE START STOP SWITCH 3 WHEN THE OPERATION ABOUT NORMALLY LD 303 LIGHTS THE ELECTRICAL PARTS IN THE OUTDOOR UNIT ESPECIALLY POWER MODULE CAN BE THOUGHT TO BE NORMAL 1 DURING OPERATION LD303 RED LIGHTS NORMAL OPERATION COMPRESSOR OPERATION NOT MALFUNCTION SERVICE TO COLLECT REFRIGERANT OR TO OPERATE OUTDOOR OPERATION UNIT INDEPENDENTLY TURN OFF POWER SWITCH OF THE INDOOR UNIT ONCE THEN TURN OFF AGAIN AND OVERLOAD OVERLOAD 3 THE ROTATION SPEED IS AUTOMATICALLY CONT ROLLED TO PROTECT THE COMPRESSOR IN THE OVERLOAD CONDITION THIS SHOWS AN OVERLOAD NOT MALFUNCTION SET THE SERVICE SWITCH TO COOL SIDE COOLING CYCLE IS SET TO OPERATE UNIT AGAIN BE SURE TO RETURN SERVICE SWITCH TO NORMAL AND TURN OFF POWER SWITCH THEN TURN IT ON AGA
70. humidifying mode operates as follows by comparing the preset room temperature and the actual room temperature D When room temperature gt preset room temperature operation is done according to the preset room temparature of the remote controller When room temperature preset room temperature regardless of the preset room temperature a temperature slightly lower than the actual room temperature automativally becomes the set temperature Sin Q4 is the case of above 2 it is not possible to operate using the room temperature control Turn off using the Start Stop switch once set the preset room temperature again then turn on using the Start Stop switch This is the case of in 4 A temperature slightfy lower than the actual room temeprature becomes the set temperature and the dehumidifying operaion is done if possible 87 Heating operation The circulation stops occasionally during the This occurs during defrosting Walt for 5 10 minutes heating operation until the outdoor unit is defrosted Even when the fan speed is set to Hi or At the begining of the heating operation the fan speed is the operation starts in the Lo mode held to Lo for 30 seconds If Hi is selected operation is done at Lo first then Med for 30 seconds and then is switched to Hi Heating operation stops when the If the external temperature is too high heating operation set temperatu
71. idifying operation 3 Detection of the reversing valve 2 non operation or heat exchanger temperature thermistor open The voltage at depends on the heat exchanger temperature as shown in Fig 6 2 10 0 10 20 30 40 Heat exchanger temperature Fig 6 2 58 7 Temporary Switch 12V TEMPORARY SWITCH SW701 MICRO COMPUTER OV Fig 7 1 e The temporary switch is used to operate the air conditoner temporarily when the wireless remote control is lost or faulty e The air conditioner operates in the previous mode at the previously set temperature However when the power switch is set to OFF it starts automatic operation 8 DC Fan Motor Drive Circuit e Fig 8 1 shows the indoor DC fan motor drive circuit Micro computer Indoor DC Fan motor Output divider 8 Fan current detection Terminal board D Fig 8 1 e The circuit produces the fan motor drive voltages 8 33V from 35V DC supplied from the outdoor unit and controls the fan motor speed Q903 is switched on and off according to the signal at fan PWM output pin to control the voltage which is smoothed by D901 L901 and C901 to drive the fan motor e The output voltage is divided by R901 and R903 and is input to divided voltage output the micro computer controls the fan PWM output so the output voltage is set to the specified value The chopper frequency of the fan PWM output is 15 7 2 e In t
72. igure and take out the Push and pull to the direction of arrow v 2 Install the new batteries N The direction of the batteries should match the marks in the C case P CAUTION 1 Do not use new and old batteries or different kinds of batteries together 2 Take out the batteries when you do not use the remote controller for 2 or 3 months TEMPORARY SWITCH remote controller does not work Use this switch to start and stop when the io SWITCH e By setting the temporary switch the operation is done in previously set operation mode e When the operation is done using the temporary switch after the power source is turned off and turn on again the operation is done in automatic mode 3 POWER SWITCH 21 THE IDEAL WAYS OF OPERATION Warning Freezing temperature is bad for health and a waste of electric power Suitable Room Temperature It is possible to reduce heat entering the room through windows P Ventilation Caution Do not close the room for a long period of time Occasionally open the door and windows to allow the entrance of 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 In
73. ime The room temperature differs from the preset temperature set by the room temperature control The air does not come out immediately after starting operation conditions the operating time is defferent every day Has the present time been set If the clock is not set the timer cannot be set The present time display When the present time is set appears for about 10 seconds the display blinks for about 3 The timer set display has minutes priority The reserved time may have been passed When the present time reaches the reserved time the reserved time is erased This is not a problem The In the Auto fan speed mode System automatically controls the system detects the heat the fan speed to protect the exchange temperature and blowing out of cold air automatically changes the fan Speed to Hi Med and Lo when the temperature is low This is not a problem Since the compressor is operated at full speed to increase heating cooling capacity when starting operation it gets louder This is not a problem The speed of the compressor varies depending of the temperature difference between the preset temperature of the thermostat and the room temperature The room temperature may differ from the preset temperature due to the structure of the room air flow condition etc Ifthere is a difference adjust the preset temperature to obtain the optimum room temperature After the power is turned on when the heatin
74. ing to the humidity judgement when the thermostat is turned OFF When the operation is started by the themostat turning ON the start of the indoor fan is delayed 32 seconds after the start of compressor operation The compressor is operated forcedly for 3 minutes after operation is started The miniumu ON time and OFF time of the compressor are 3 minutes 49 COOL RHYTHM Room temp Minimum Minimum Minimum Minimum Final Preset temperature 5 ne 5 min sis Minimum 5 min _5 min 5 min gt 5 Minimum 5 5 5 min M Cooling Preset temperature normal Cooling Preset temperature rhythm 0 66 0 33 Thermostat judgement Hi Referto the basic Indoor fan Med Lo Outdoor fan Lo Compressor rotation Speed Note Cool rhythm operation starts during the cooling operation in the AUTO operation mode not during Cool dash and when the room temperature is the preset temperature 0 66 or less In Cool rhythm operation the temperature rising period is 10 minutes minimum and also temperature falling period is 10 minutes minimum The Cool rhythm operation is not done during Nice temperature Sleep and Cool dash operations In Cool rhythm operation PI control is done and the compressor rotation speed limit is the same as in normal operation
75. ion mode NO Replace the micro computer Perform a final check of operation 4 The fan speed of the indoor unit fan cannot be changed other functions are normal YES Replace the micro computer Replace Q904 Replace Q903 Replace the micro computer Is a voltage of DC25V 35V generated Is a voltage of DC 5V generated be between pins 7 Blue and 9 Red tween pins CD Blue and 9 Yellow of CN10 when operated in the of CN107 HIGH fan speed mode Is a pulse of about 33Vp p generated at the callector of Q904 in the fan op eration mode Is the voltage collector of Q904 ap prox OV at this time Is the fan PWM Pulse Width Modula tion output pin 87 of micro computer YES gt YES Is the voltage collector of Q904 ap prox OV The fan cannot be stopped by the re Is the fan PWM output pin 67 of the micro computer set to Hi mote controller Perform a final check of operation 100 6 air deflector cannot be moved other functions are normal NO Are pulse signals output at pins 2 of micro computer when the auto air deflection is set to ON in the fan operation mode Replace the micro computer YES 15 a voltage of 15V or more generat E Replace REGI E ed between 1 and 12V line of Check 501 and if there is no abnor REG2 NO mality replace the auto sweep motor Perform a final check of op
76. is OFF Each coil C61 C67 is charged according to the winding ratio 203 turns ON Q2 to bypass Q1 base current during ON period to fix value of voltage in the direction of arrow For example when applied voltage to Q1 is high voltage in the direction of arrow will rise and current bypassing to Q2 is increased Overcurrent flows at Q1 due to charged current at C61 C67 when starting operation When ZD3 reaches On voltage as a result of the voltage generated in the direction of arrow by Q1 collector current Q2 is turned ON and Q1 base current is bypassed e By limiting base current with Q2 Q1 is prevented from allowing too much collector current to flow EP lt Reference gt e When power circuit for is estimated as abnormal 1 Check that power voltages of 5V 12V on the control PW B and also power voltage of upper arm U V and W and lower arm are specified values PQ601 603 Check 5V 50 5 12V and O 5V 8 a Test pin 11 using test pin 4 Check as follows to measure power voltage of upper mo HIC d arm U V W and lower arm drive circuit a U phase of upper arm A g Apply terminal of tester to pin 8 of PQ501 8 Apply terminal of tester to 7 of PQ502 e 0291 b V phase of upper arm Apply terminal of tester to pin of PQ501 Apply terminal of tester to pin 7 of PQ502 W pha
77. le DC voltage DC current detection detection circuit circuit e Thiscircuit full wave rectifies 220V AC applied between terminals A B to produce a DC voltage of 220 x 2 310V at the positive and negative terminals However 105211001771 eT TS rs o e The following describes the main parts components 1 Reactor and power capacitor Reference gt The filter consisting of a reactor and power e lfthe reactor is faulty or the connection is defective capacitor removes high harmonics the compressor may stop due to abnormality in components from the current containing line voltage etc immediately after it is started high harmonics occurring when the compressor is operating to improve the Reference power factor When diode become defective the compressor may 2 Diode stacks stop due to abnormality in line voltage etc These rectify the 220V AC from terminal immediately qd it started or no operation may boards A and B to a DC power supply be done asa DC voltage is not generated between the positive and negative terminals e When diode stack becomes defective check whether the 15A fuse has blown 62 3 Smoothing capacitor This smoothes averages the voltage rectified by the diode stacks VD DC valtage Fig 1 2 DC voltmeter or teste same as oscilloscop PRO Reference gt VD e voltage can be measured by connecting bot
78. me day month p n NIZ NIZ wb Ne at the present time 4 1 Press the OFF TIMER button The 7 OFF mark blinks RESERVE on the display AM CANCEL Gre gt 2000 You can set the device to turn off e he device will turn on at the designated times CUTEM TS 1 Press the 1 ON TIMER button the ON mark blinks on the display gt ON OFF Timer 1 Press the ON OFF button so that the OFF switching operations 2 Set the turn off time with the TIMER control 3 Press the 12 TIMER button so that the ee mark blinks button CO OFF mark lights and Press the RESERVE the ON mark blinks button nean The device will turn on off and off PM f LI ELI on at the designated times _ The switching occurs first at the eui ll Lt i preset time that comes earlier 05 arrow mark appearing on the Qa 4 O gt 1 i display indicates the sequence of 71 AN 71 AM How to Cancel Reservation button Point the signal window of the remote controller toward the indoor unit and press the O CANCEL The RESERVED sign goes out with a beep and the TIMER lamp turns off on the indoor unit NOTE You can s
79. micro computer starts operation e When power is OFF the voltage on the 35V DC line drops and when it is approx 24V ZD201 turns off Q201 and Q202 turn off and the reset input of the micro computer goes Lo to reset it 55 2 Receive Circuit 12V R709 20701 710 LIGHT RECEIVING 18 Wireless input UNIT Micro computer Fig 2 1 e The Light receiving unit receives an infrared signal from the wireless remote control The receiver amplifies and shapes the signal and outputs it 3 Buzzer Circuit 12V Micro computer R801 82 BZ1 9 1 Buzzer output 21 HW 9805 NEN PEUT P Y OV Fig 3 1 Buzzer Circuit e When the buzzer sounds an approx 3 9kHz square signal is output from buzzer output pin of the micro computer After the amplitude of this signal has been set to 12Vp p by a transistor it is applied to the buzzer Metal diaphragm Pizoelectric element The piezoelectric element in the buzzer oscillates to generate the 1 2222221 buzzer s sound LO LL cx Pommes d V gt 4 V Sound wave 2 Fig 3 2 Buzzer Operation 56 4 Auto Sweep Motor Circuit 12V Z iis Auto sweep motor for horizontal air deflectors Micro computer EN Exc Lee 5 00000 o o1 1 1 1 1 1 OV
80. n Detection Circuit 12V 30 25 go 96 gs S g Voltage at point about 230V Voltage at point 2 Voltage at p Voltage at point Voltage at point o B transis transis transis C transis tor ON tor ON tor ON tor ON Fig 6 1 Rotor magnetic pole position detection circuit and voltage waveform at each part e Motor induced voltage signal voltage at point is phase shifted by 90 by passing lowpass filter consisting of R101 R104 and C101 to make triangular wave voltage at point B In HIC 3 phases of this triangular wave are synthesized to produce composite wave voltage at point C This composite wave becomes a triangular wave with period of 1 3 times compared with original triangular wave e Voltages at points B and C are compared by comparator to make voltage at point Voltage at point D is taken into microcomputer and timing of switching from transistor to W transistor is made by rising waveform and timing of switching from V transistor to W transistor is made by failling waveform e For other 2 phases V phase and W phase the operation is the same and phases are shifted by 120 and 240 respectively compared with U phase waveform 74 7 Drive Circuit 1 Upper Arm Drive Circuit e Fig 7 1 shows the upper arm drive circuit The circuit configuration is completely the same for phases A B and C Power mo
81. n by capital letters in the diagram 45 Dehumidifying Cooling defrost Indoor unit heat exchager temperature 30 Room temperature judgement Room temperature Cooling preset i Thermostat temperature judgement Thermostat OFF gt Med Refer to the basic operation Room temperature judgement Indoor fan Lo 15 sec 30 sec Outdoor fan Ee Start Stop Switch g 1 Operation lamp minimum 3 min Humidity judgement Low humidity Thermostat judgement High humidity _ i Compressor rotation Hi 5 min min ON 6 min min ON gt Spend Hi A Outdoor fan Med Note 1 Compressor stop time is 3 minutes minimum Lo Reversing valve Indoor fan rotation speed Note 1 Refer to data in page 41 Table 1 for each constant shown by capital letters in the diagram Compressor 30 seconds after the operation is started when the room temperature is cooling preset temperature 1 33 C or less 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 OFF for 5 minutes and ON for 1 minute at high humidity or OFF for 6 minutes and ON for 1 minute at low humidity repeatedly accord
82. nds The smoothing capacit F Cabel 22 single lead ors 1 000uF are charged to about 340V Don t forget to discharge them before Soldering iron of 30 75W attempting access to electric parts Do not use a soldering iron with built in transformer the fuse Both ends 4 built in the transformer of R802 would blow out DC voltmeter or tester same as in case of oscilloscope CUTTING OFF POWER SUPPLIED TO THE POWER CIRCUIT Remove the receptacle of the gray brown lead wire connected to the smoothing Before checking capacitor from control P W B before performing operation check of each point in the electric parts of the circuit outdoor unit disconnect the power line of the power circuit to cut off supply power This is necessary to protect the parts When checking conductivity at each point of circuit in electrical parts of outdoor unit to prevent secondary trouble disconnect gray black lead wire connected to smoothing capacitor from control P W b in order to shut off power to the power module before checking Connect side of C516 and 5V using clip at this time If this is not done there will be no drive output LED310 blinking 10 times mode is set 92 sure to replace the rainproof cover after checking rainwater would enter if it is not installed 93 R inproof cover transparent CHECKING THE INDOOR OUTDOOR UNIT ELECTRICAL PARTS AND REFRIGERATING CYCLE
83. near by it is recommend to stop the operation and to disconnect the power cord plug from the power outlet for safety 3 Ifthe room air conditioner is stopped by setting the temperature or mis operation and then re started in a moment cooling operation does not start for 3 minutes it is not abnormal and this is the result of the operation of IC delay circuit This IC delay circuit ensures that there is no danger of blowing fuse or damaging parts even if operation is restarted accidentally 4 This room air conditioner should not be used at the cooling operation when the outside temperature is below 20 5 When the operation knob is set to COOL from another position IC delay circuit functions and stops the compressor for the first 3 minutes which is not an abnormal phenomenon SPECIFICATIONS MODEL RAS 25CNH1 1 RAC 25CNH 1 1 FAN MOTOR FAN MOTOR CAPACITOR FAN MOTOR PROTECTOR COMPRESSOR GR20DR2F COMPRESSOR MOTOR CAPACITOR NO OVERLOAD PROTECTOR OVERHEAT PROTECTOR FUSE POWER RELAY STICK RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR REMOTE CONTROL SWITCH LIQUID CRYSTAL NO THERMOSTAT NO FUSE CAPACITY 16A INRUSH WITHSTAND TYPE K 690g REFRIGERANT CHARGING VOLUME Refrigerant 22 690g for piping set of 5 8m WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE T
84. normal other parts such as power module HIC regulator could be defective eO 5 Reversing valve control circuit I F 35V HIC Reversing valve DC voltmeter or tester Fig 5 1 Since the reversing valve is differential pressure system even when reversing valve is ON collector voltage of Q701 is about 0 8V normally compressor rotation speed instructed by indoor microcomputer exceeds 3300min signal at pin 4 of microcomputer changes and collector voltage of Q701 will be about 36V This does not indicate trouble When rotation speed is reduced under 2700 collector voltage of 0701 will fall to about 0 8V again To measure voltage connect terminal of tester to D701 anode and terminal to D line on the terminal board e By reversing valve control circuit you can switch reversing valve ON OFF according to instruction from indoor microcomputer and depending on operation condition 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 36V 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 22782 6 Rotor Magnetic Pole Positio
85. odorizing filters using d vacuum cleaner If there is too much dust rinse under running tap water and gently brush it with soft bristle brush Allow filters to s dry in shade Air cleansing and Air filter deodorizing filter INSTALLATION METHOD 3 Re insert the air cleansing and deodorizing 4 t fillers to the filter frame Set the filter with FRONT mark facing front and slot them into the original state Y e After attaching the filter push the front panel at three arrow portions as shown in figure and close it NOTE e Air cleansing and deodorizing filter should be cleaned every month or sooner if noticeable loading occurs When used overtime it may loose its deodorizing function For maximum performance it is recommended to replace it every 3 6 months depending on application requirements J 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 use detergent on the air cleansing and deodorizing filter as some detergent may deteriorate the filter electrostatic performance 25 2 Washable Front Panel e Remove the front panel and wash with clean water Wash
86. odule s terminals terminals R604 601 to cut off the lower arm transistors Fig 7 5 e R607 is used to charge C601 initally e The operation is the same for B and phases e When the peak current cut off function operates HIC 1 pins become 0 PQ501 PQ503 and PQ601 PQ603 turn off and the upper lower arm drive circuits stop e when a reset signal is applied HIC pins 7 and 62 become open PQ501 PQ503 and PQ601 PQ603 turn off and the upper lowerarm drive circuits stop UNA 8 HIC and Peripheral Circuits e Fig 8 1 shows the micro computer and its peripheral circuits Table 8 1 the basic operations of each circuit block and Fig 8 2 the system configuration HIC 1 Power module positive 5 terminal 1 R229 R230 ETT R231 0V Micro computer bu AX 8E21 ZD301 R232 Normal Hi RESET 2 at Reset Lo 87 Normal Hi 0 0 POR z 02 Y 5V Power moule negative R201 terminal R806 Current detection Resistor oV Normal C206 To upper arm drive circuit Cool Fig 8 1 Micro computer AX 8E21 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 1 signal by which drive signal output HIC 83 88 from microcomputer is stopped
87. oltage for microcomputer peripheral circuits and power module drive and as well as DV35V are produced by switching power circuit e Switching power circuit performs voltage conversion effectively by switching transistor Q1 to convert DC270V voltage to high frequency of about 20kHz to 70kHz e Transistor Q1 operates as follows 1 Shifting from OFF to ON e DC about 270V is applied from smoothing capacitors C810 and C811 in the control power circuit With this power current flows to base of transistor Q1 via R1 and Q1 starts to rurn ON Since voltage in the direction of arrow generates at point C at the same time current passing through R5 R6 and D2 is positive fed back to Q1 70 2 During ON period e Collector current of Q1 is increased directly In this period base current is fixed by saturation characteristic of transformer 3 Shifting from ON to OFF e In this circuit feed back negative is applied from 12V output When voltage between both ends of C65 reaches the specified value M51 is turned ON and current flows between pin 1 and 2 of P151 secondary side is turned ON current flows to base of Q2 via R9 and D4 Q2 is turned ON and Q1 base current is bypassed to turn Q1 OFF 4 During OFF period e During Q1 ON period energy as shown below is charged at primary winding of transformer and is discharged to each secondary coil during OFF period Energy LI 2 L Primary inductance Current when Q1
88. omputer Upper arm Drive circuit Voltage at pin 9 Voltage at point Lower arm Drive circuit Fig 8 3 Peak current cut off circuit and Waveforms at Each Section e cut off circuit detects an instantaneous large current and stops drive output signal to protect parts such as power module etc e As shown in the figure when current exceeding 18A flows voltage at point detected by detection resistor is input to terminal of COM A If it exceeds terminal voltage which is the set value output pin voltage point B of COM A changes from Lo to Hi Thus Q1 is turned ON to stop drive curcuit and at the same time voltage at point changes from Hi to Lo to send Ip signal to 22 of microcomputer observed by pin of HIC and microcomputer stops drive e Onthe other hand terminal voltage is pulled up by R1 and DC current becomes Even when voltage at point returns to OV power is not supplied current value of zero Output is temporarily held in Hi state since voltage at terminal is high memory function e Just before drive signal is output the next time Microcomputer switches pin 23 from Hi to Lo observed by pin 8 of so that terminal voltage lt terminal voltage to release memory function and return to initial state 79 2 Overload control circuit OVL control circuit e Overload control is to decrease the speed of the compressor and reduce the load when the lo
89. omputer 64 Pin GERE OV Q9Pin Mw 4 955 33ms Transmit receive iframe switching time Fig 2 3 Voltages Waveforms of indoor Outdoor Micro computers Indoor to Outdoor Communications 66 NO S A NO S N Jewog L E 614 l 99UP SIS9J 199 o9p JO1O0 N 105591909 109 M 2180 fejeJ xons 109 1 9SION vsi asna i 91 5 21 1M0 BU APIS y uo siojsisueJ pue jeddn eui pej eo epis 0 y uo 101 15 9914 eu SNo eeudued sy pue 19 od eui swous 1 e 3 Power Module Circu 67 e DOC 230V is input to power module and 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 E Ut is ON is ON circuit in Fig 3 1 At point Ut is chopped OFF is ON circuit in Fig 3 4 V Ut Upper arm transistor Lower arm w U v wo u Time transistor Fig 3 2 Switching order of power module e Upper arm transistor is controlled to ON OFF by 3 2kHz chopper signal Rotation speed of the compress is proportional to duty ratio ON time ON time OFF time of this chopper signal
90. oom temperature becomes the preset temperature 0 66 C after the Dash operation is completed Preset temperature cooling 27 C Fan speed mode AUTO Preset temperature for dehumidifying Room temp at operation start 2 Fan speed mode Lo Room temp at start of operation C Preset temperature or heating 23 C Fan speed mode AUTO Heating Dehumidifying Cooling Note 1 Mode is not changed after the operation is started 2 The preset temperature be changed within 3 C using the room temp control button A V For example if the preset temperature for cooling is increased by 2 C to change it to 29 C the preset temperature for heating is also changed to 25 C Also the operation mode selected from the room temperature at the start of operation is judged based on the changed value 43 BASIC COOLING OPERATION Preset temperature for cooling SHIFTC Start stop switch Room temp ZNTCMAX Fan speed auto setting Stop Thermostat Thermostat judgement OFF Super Hi Hi Indoor unit fan Med Lo Super Lo Operation lamp Maximum CMAX Rated speed CSTD Compressor rotation speed Outdoor fan 3000 Minimum CMIN Fixed rotation period
91. oor lighting is controlled electronically the range of control may be shorter This unit can be fixed on a wall using the fixture provided Before fixing it make sure the indoor unit can be controlled from the remote controller HITACHI Signal emitting window transmission sign Point this window toward the indoor unit when controlling it cH The transmission sign blinks when a signal is sent Display This indicates the room temperature selected current time timer status function and intensity of circulation selected START STOP button Press this button to start operation Press it again to stop operation SLEEP button Use this button to set the sleep timer TEMPERATURE buttons Use these buttons to raise or lower the temperature setting Keep pressed and the value will change more quickly TIME button Use this button to set and check the time and date RESET buttons FUNCTION selector Use this button to select the operating mode Every time you press it the mode will change from AUTO to HEAT to DEHUMIDIFY to COOL and to FAN cyclically FAN SPEED selector This determines the fan speed Every time you press this button the intensity of circulation will change from AUTO to HI to MED to LOW during the FAN mode from to MED to LOW AUTO SWING button Controls the angle of the horizontal air deflector TIMER control Use this button to set the tim
92. or unit AV MC gt la Example m AM 71 AM ey m The device will automatically turn on earlier so that the preset nnn O 11 temperature be reached at 7 00 a m The setting of the turn on time is now complete 4 set the turn on time with the 5 Point the signal window of the remote controller toward the indoor unit and TIMER control button press the RESERVE button The ON mark starts lighting instead of flashing and the RESERVED sign pum lights A beep occurs and the C TIMER lamp lights on the indoor unit PM Lf ELI SE Ly Q i y n The device will turn off at 10 30 p m and then automatically v NI L4 4 turn on earlier so that the preset temperature can be reached i O 1 at 7 00 a m ass The settings of the turn on off times are now complete AM M 11 9 e The timer be used three ways off timer on timer and ON OFF OFF ON timer Set the current time at first because it serves as a reference e As the time settings are stored in memory in the remote controller you only have to press the RESERVE button in order to use the same settings next time ex HOW TO SET THE SLEEP TIMER Set the current time at first if it is not set before see the pages for setting the current time Press the SLEEP button and the display changes
93. ourself 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 P di Clip for connection with 1MQ grounding wire Fig 2 Body Earth EM 6 Use a three wire type soldering iron including a grounding wire Metal plate of aluminium stainless steel etc Working table Resistor of 1 1 2W Earth wire Bare copper wire for body earth Fig 3 Grounding of the working table Soldering iron Grounding wire Screw stop at the screwed part using a rag plate Fig 4 Grounding a soldering iron Use a high insulation mode 100 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 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
94. ove 100mm insulated with insulation pipe and then wrapped with vinyl tape The insulator will give clearance deteriorate if it is not wrapped as wide as possible with tape P connection of insulated drain 55555552555 72 RSS K inner diameter o 16mm 5 Please use insulated drain hose 9 for the indoor piping commercial product SAFETY PRECAUTION e Please read the Safety Precaution carefully before operating the unit to ensure correct usage of the unit Pay special attention to signs of 44 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 e Make sure to connect earth line The sign in the figure indicates prohibition Q Indicates the instructions that must be followed Please keep this manual after reading PRECAUTIONS DURING INSTALLATION e Do not reconstruct the unit Water leakage fault short circuit or fire may occur if you reconstruct the unit by yourself e Please ask your sales agent or qualified technician for the installation of your unit Water leakage short circuit or fire may occur if you ins
95. ower supply DC5V Electrolytic capacitor 100410 3 2 1kn 1 4W Carbon resistor i Light receiving unit i ov O H 66V 2 4 9 Viewed from the Light receiving unit terminal side 3 Using the test card Ultra redray test card Ni 2 i 2 cm Sensible area The sensible area should flash in orange when you operate the remote control unit if is good 103 The air conditioner does not operate at ail or cannot be operated correctly Is 220V supplied to the terminal Is chattering sound of relay heard Is the 15A fuse normal Is the power circuit normal Refer to the power circuit for detals YES YES NO Is 35V being applied between C and D Because of reverse connection of C D line chattering occurs at I F re z Correct connection of C D line Be careful since the other parts could also be defective hen the 15A fuse is blown Mainly diode stack smoothing capacitor power modure etc Replace defective parts LLHNOSZ OVH 13aow un JOOPINO y syed eui SOI Is 3A fuse normal may be defective Is switching power circuit normal 9 gt Replace defective parts fuse has been blown Q1 switching transfo
96. peration is stopped during DEFROST the mode switches to AUTO FRESH DEFROST AUTO FRESH DEFROST does not work within 15 minutes after the operation is started or after DEFROST is Note 1 Refer to data in Table 1 on page 41 for each constant shown in capital letters in the diagram 2 In the diagram O attached to the top right of number mean minute O means second ex 30 53 157 AUTO SWING FUNCTION INPUT SIGNAL PRESENT CONDITION OPERATION OPERATION MODE AIR DEFLECTOR OPERATING SPECIFICATION REFERENCE KEY INPUT EACH MODE STOP ONE SWING CLOSING AIR DEFLECTOR DOWNWARD UPWARD INITIALIZE AT NEXT OPERATION DURING ONE SWING STOP AT THE MOMENT DURING OPERATION AUTO COOL COOL FAN AUTO DRY DRY START SWINGING DOWNWARD UPWARD DOWNWARD DURING SWINGING STOP AT THE MOMENT AUTO HEAT HEAT CIRCULATOR START SWINGING DOWNWARD UPWARD DOWNWARD DURING SWINGING STOP AT THE MOMENT THERMO ON INTERNAL FAN ON THERMO OFF INTERNAL FAN OFF DURING OPERATION AUTO DRY DRY AUTO HEAT HEAT CIRCULATOR TEMPORARY STOP START SWING AGAIN DURING SWINGING STOP SWINGING TEMPORARILY SWING MODE IS CLEARED IF SWING COMMAND IS TRANSMITTED DURING TEMPORARY STOP MAIN SWITCH ON COOL FAN DRY STOP DURING ONE SWING INITIALIZE DOWNWARD UPWARD HEAT CIRCULATOR STOP DURING ONE SWIN
97. rcuit consists of a transmiting circuit which superimposes an interface signal transmit from the micro computer on the 35V DC line and a transmiting circuit which detects the interface signal on the 35V DC line and outputs it to the micro computer 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 indoor unit e Outdoor micro computer to indoor micro computer Request signal output from IF transmitting output pin 4 of outdoor microcomputer input to transmitting circuit Transmitting circuit and receiving circuit of the outdoor unit are provided inside HIC Transmitting circuit intermits high frequency oscillation circuit of about 36kHz with comparator according to the request signal This high frequency signal is applified by the transistor and is ourput from HIC pin then superimposed with DC 35V line via C701 and L701 To prevent mis operation outdoor microcomputer does not accept receive signal whil outputting request signal The receiving circuit of the indoor unit consists of COMA The interface signal from the outdoor unit whose DC component is cut from DC35V line at C801 is waveform shaped and rectified amplified in HIC then input to receive input pin of indoor microcomputer Fig 2 2 shows the voltages at each component when
98. re is 30 C may stop to protect the unit After the Start stop switch is pressed to stop heating operation the outdoor units still operates with the Operation lamp lit Auto fresh defrosting is carried out The system checks the outdoor unit and defrosts it if necessary before stop ping operation vo XY XV 88 Auto operation In the auto operation mode the fan speed cannot be changed using the fan speed selector switch How is operation mode decided in AUTO operation Is it possible to adjust room temperature in the AUTO operation mode Nice temperature reservation When ON timer is set the system starts woring earlier than the reserved time Is it possible to use the Nice temperature reservation in the dehumidifying operation The auto fan speed mode is set automatically The following conditions are set automatically In the cooling mode Room temperature is set to 27 C In the dehumidifying mode Temperature is set to a value slightly lower than present room temperature In the heating mode Room temperature is set to 23 C You can raise set room temperature up to 3 by using A or lower it up to 3 C by using 6 v Automatically Heating Cooling or Dehumidifying is chosen according to the room temperature Cooling Room temperature is higher than about 27 C Dehumidifying Room temperature is about 23 27 Heating Room temperature is tower than 23 C
99. rmer ZD3 etc Operate the outdoor unit according to the Operation of the outdoor unit indepndently What condition does the self disgnosis lamp indicate NO Are cords for connecting terminal Securely insert them if loosened or disconnected LD301 Blinking 10 times board reactor diode smoothing Half voltage error capacitor etc connected correctly YES Is power circuit of compressor normal Refer to Power circuit for details LD301 Blinks 9 times Is DC 35V output at C and D termi nals DC 33V 40V is output in the normal state Communications error 90r lt Is there DC35V output at both ends of C67 There are defective parts between brown red jumper wire and C D line Interface relay Coil terminal Contact terminal Is DC 12V applied to both ends of the control side coil terminals of the interface relay Is a voltage 10V or more generat ed between the connection termi nals of the interface relay UU Check the interface circuit There are defective parts between the 12V output of the switching power supply on the control P W B and the interface relay Also check the solder touch etc YES Replace the interface relay 2101 LD301 Blinks 8 times Acceleration d
100. room temperature automatically so as to be quiet and good for people s health You can set the sleep timer to turn off after 1 2 3 or 7 hours The FAN SPEED and room temperature will be controlled as shown below Operation with the sleep timer Function Operation The room temperature will be 5 C controlled 5 C below the 1 Heating temperature and the FAN SPEED will be set to LOW setting 30 minutes after the Sleeptimerset halite setting of the sleep timer 2 hours later 30 minutes later later 1 hour later 3 hours later The room temperature will be 2 Cooling controlled 2 C above the temperature and the FAN POE SPEED will be set to LOW later and setting 30 minutes after the Sleep a a a setting of the sleep timer timer set 1 2 hours 7 hours later dehumidifying later 30 minutes later hours later Fan The settings of room temperature and circulation are varied T NOTE e If date or current time is not set sleep timer can not be set e f you set the sleep timer after the off on off or off on timer has been set the sleep timer becomes effective instead of the off on off or off on timer set earlier e 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 19
101. rt current DC current constant to smooth the start of the DC motor for the compressor The RAC 25CNH11 uses software to control the start current The start current varies when the supply voltage varies This control method copes with variations in the voltages as follows 1 Turns on the power module s U and V transistors so the current flows to the motor windings as shown in Fig 8 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 8A as shown in Fig 8 10 Power module DC current DC 260 290V Chopper duty high DC voltage low 2 DC voltage 260V 2 x DC voltage high 52 1 a 8 DC voltage start current lt Set value 2 5 4 2 4 Time 4 Start Fig 8 10 82 9 Trip Signal Synthesis Circuit e Fig 9 1 shows the trip signal synthesis circuit This circuit is provided to stop the drive signal etc according to whether or not the 1 cut signal or reset signal is present HIC 1 20301 Micro computer AX 8E21 Normal Hi Reset Lo S R223 gt Oe Mc 2 3 5 J PQ501 R N 2 R PQ502 22 AW PQ503 ov R226 5 w PQ601 R227 AW PQ602 R228 3 A PQ603 ae OMO A Q2 Ip Cut off SY Ov Fig 9 1 Trip Sigmal Syn
102. se of upper arm CAUTION Apply terminal of tester to pin of PQ503 PQ501 503 DC voltmeter Apply O terminal of tester to 7 of PQ503 or tester When measuring drive d voltage if short circuited between pins it could be Apply terminal of tester to pin 8 of PQ601 damaged Appl terminal of tester to pin 7 of PQ602 4 pply 7 8 1 CAUTION CAUTION For PQ501 503 and Be careful not to short circuit by touching of PQ601 603 apply tester terminals etc terminal to pin 8 C terminal to pin 7 If short circuited between pins it could be damaged Fig 4 2 2 Abnormal only when output of 5V voltage has decreased Regulator 1 is abnormal short circuited between 5V and OV or output too high 3 When 12V and 5V voltage are abnormal 1 Mainly 2 Fan operation power or inrush current protective relays short circuit inside relay etc 3 HIC abnormal Regulator 1 abnormal etc Primary side short circuited When secondary side is short circuited primary side is normal because of overcurrent protective device Voltage rise when primary side is open feed back system abnormal 4 When each phase of upper arm U V W or lower arm power is abnormal D61 D65 RC61 62 or drive circuit is abnormal 5 When all voltages are abnormal Q210 ZD201 R205 etc may be abnormal X Be careful if Q201 is ab
103. stall curtain or blinds J Effective Usage Of Timer At night please use the OFF or ON timer operation mode together with your wake up time in the morning This will enable you to enjoy a comfortable room temperature Please use the timer effectively Please Adjust Suitable Temperature For Baby And Children Please pay attention to the room temperature and air flow direction when operating the unit for baby children and old folks who have difficulty in movement 20 FOR USER S INFORMATION The Air Conditioner And The Heat Source In The Room 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 period of time please switch off the power from the mains If the power from mains remains ON the indoor unit still consumes about 8W in the operation control circuit even if it is in OFF mode When Lightning Occurs To protect the whole unit during lightning please B stop operating the unit and remove the plug from the socket Warning 4 K Interference From Electrical Products Inverter type fluorescent lamp Caution To
104. tall WARNING the unit 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 circuit breaker should be installed depending on the mounting site of the unit Without a circuit breaker the danger of electric shock exists e Do not install near location where there is flammable gas The outdoor CAUTION unit 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 unit Electric shock or fire may occur if you remove and reinstall the unit yourself improperly PRECAUTIONS DURING OPERATION Avoid an extended period of direct air flow for your health e Do not put objects like thin rods into the panel of blower and suction side because the high speed fan inside may cause danger e Do not use any conductor as fuse wire this could cause fatal accident 2 2 2 Q F e Durin
105. thesis Circuit e Table 9 1 shows to which circuits the various modulation signals are transferred For example the chopper signal is only transferred to the upper arm transistor drive circuit and the reset signal is transferred to the micro computer and upper and lower arm transistor drive circuits e On the other hand pins 89 2 of the HIC 1 change from Lo to Hi alternately and supply the voltage to PQ501 PQ503 and PQ601 PQ603 e The chopper signal from the micro computer is inverted by Q1 and turns PQ501 PQ502 or PQ503 ON or OF to which voltage is applied at a high frequency to supply curent thus transferring the upper arm drive signal e When the reset voltage is Lo the base of Q2 goes Lo to turn Q2 OFF and also stops the operation current of PQ601 PQ603 to switch OFF the lower arm drive signal With the upper arm transistor drive circuit the base of Q1 goes Lo and the micro computer stop supplying a voltage to PQ501 PQ503 thus switching OFF the drive signal e The peak current cut off Ip cut signal fixes the base of Q1 and Q2 in the upper lower arm transistor drive circuits at Lo to switch OFF the drive signal in the same way as when the reset voltage is Lo Table 9 1 Circuits to which trip signals are transferred Chopper signal Start current limit signal Peak current cut off signal Q O Reset signal Q 82 10 Temperature Detection Circuit HIC O
106. tion other than Cool dash is within 60 minutes when the room temperature is CLMXTP or less the room temperature is more than CLMXTP there is no time limit When the fan speed setting of the remote control is Med the maximum compressor speed is CJKMAX When the fan speed setting of the remote control is Lo the maximum compressor rotation speed is COZMAX When the fan speed setting of the remote control is Hi and both the room temperature and external temperature data from the outdoor unit satisfy the dewing condition shown in Table 2 the maximum compressor speed is CKYMAX This control is effective only when external temperature data is provided Table 1 ATCMAX Note Max speed CMAX Min speed CMIN Room temp Preset temp including shift 650 1 66 C Table 2 Dewing condition judgement value Item 750 2 00 C 800min 2 33 C Dewing condition ON Dewing condition OFF 850min 2 66 C 950min 3 00 C 1000min 3 33 C 1050min 3 66 C 1150min 4 00 C 1200min 4 33 C 1250min 4 66 C 1350min 5 00 C 1400min 5 33 C 1450min 5 66 C 1550min 6 00 C 1600min 6 33 C 1650min 6 66 C External temp Room temp Dewing condition ON Dewing condition OFF 1 Refer to data in page 41 Table 1 for each constant show
107. tions as shown in figure and close it S amp S NOTE In case of removing the air cleansing and deodorizing filters please follow the above procedures The cooling capacity is slightly weakened and the cooling speed becomes slower when the air cleansing and deodorizing filters are used So set the fan speed to HIGH when using it in this condition Air cleansing and deodorizing filters are washable and reusable up to 20 times by using vacuum cleaner or water rinse under running tap water Type number for this air cleansing filter is lt SPX CFH5 gt Do not operate the air conditioner without filter Dust may enter the air conditioner and fault may occur 24 MAINTENANCE A CAUTION Before the cleaning stop operation and disconnect the power supply 4 AIR FILTER Clean the air filter as it removes dust inside the room In case the air filter is full of dust the air flow will decrease and the cooling capacity will be reduced Further noise may occur Be sure to clean the filter following the procedure below PROCEDURE REMOVING METHOD 1 Open the front panel and remove the filter amp e Gently lift and remove the air cleansing and deodorizing filters from the air filter frame 2 e Vacuum dust from the air filter and air 2 cleansing and de
108. uit e The filter consisting of R320 and C1 removes high harmonic components from the voltage generated by the current flowing to R806 R2 and C304 average the voltage This voltage is then input to pin and amplified and is supplied to micro computer 42 which is comparedwith the voltage at pin 3 If the voltage at 2 is higher than that at 43 the micro computer enters the overload control mode e Fig 8 7 shows the rotation speed control When the voltage at pin of HIC exceeds the set value at pin HIC 8 the micro computer decreases the rotation speed of the compressor and reduces the load regardless of the rotation speed commanded by the indoor micro computer 80 Power module positive o HIC 1 Micro computer AX 8E21 R205 R201 DC current O R806 Voltage at HIC Voltage at HIC Rotation speed of compressor Commanded rotation speed Actual rotation speed _ Acceleration Deceleration Acceleration 2 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 micro computer Receiving this the micro computer converts it to a digital signal and compares it with the internal data to judge whether or not overload control is required During overload control gt e The filter consisting of R2
109. ver heat 45V thermistor Normal 2 7V or less Over heat 2 7V or more Reset 2 3 or less 45 7 Q Over heat R301 T Pied log Micro computer rmistor m OV Normal 2 4V more USES Defrost 2 4V or less Reset 2 9V or more CNS mim 18 5 Defrost R302 OV Fig 10 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 5V is divided by the over heat thermistor and R301 and the voltage at pin 47 of HIC e HIC the voltage at pin 47 and the set value stored inside and when it exceeds the set value the micro computer 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 48 of HIC drops If this voltage becomes lower than the set value stored inside the micro computer starts defrosting control e During defrosting operation the micro computer transfers the defrosting condition command to the indoor microcomputer via the SDO pin IF
110. y are not abnormal for the operation 1 Slight flowing noise of refrigerant in the refrigerating cycle Slight rubbing noise from the fan casing which is cooled and then 2 4 gradually warmed as operation stops y e e The odor will possibly be emitted from the room air conditioner because the various odor emitted by smoke foodstuffs cosmetics and so on sticks to it So the air filter and the evaporator regularly must be cleaned to reduce the odor A 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 Power supply shall be connected at the rated voltage otherwise the unit will be broken or could not reach the specified capacity 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 28 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS 25CNH11 1 Mounting plate 59 Air suction grill 173 VIEWED FROM BACK PIPE LEAD OUT About 280 About 290 Top air suction grill Wireless remote controller Front cover

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