Hitachi RAC-E10H2 Service Manual Download Page 59

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Main P.W.B.

HIC

O.H. thermistor

DEF. thermistor

Outdoor temperature

thermistor

Microcomputer

AX-8V10

DEF

Outdoor

temperature

C302

R303

R306

R302

R305

C303

C304

R304

R301

CN8

CN9

+5V

CN10

Fig. 6-12

R303 Voltage

(V)

Table 6-2

CN2

D701

−

35V

−

12V

Ⅰ

6-5. Reversing valve control circuit

●

In this unit, reversing valve control circuit turns ON/OFF the power to the reversing valve coil by

opening/closing the reversing valve relay.

●

Opening/closing of relay will differ depending on the operation condition. (In the cooling cycle,

reversing valve relay is normally ON (close).)

●

Table 6-3 shows the circuit operation of each operation mode. If the following result is not obtained,

reversing valve control circuit may be defective.

Table 6-3

Point

Operation mode

Cooling In normal cooling operation

In normal heating operation
In defrosting operation

approx. 35 V

12V

0V (not fixed)

Heating

Between Pin 29

of microcomputer and 0V

Between Pin 32 of HIC

and 0V

Between 1 and 3 CN2

Main P.W.B.

Reversing

valve

Reversing valve

relay coil

(RL5)

HIC

Fig. 6-13

Microcomputer

Reversing valve relay

RL5

- 63 -

Summary of Contents for RAC-E10H2

Page 1: ...UIT OPERATION 37 SERVICE CALL Q A 67 TROUBLE SHOOTING 70 PROCEDURE FOR DISASSEMBLY AND REASSEMBLY 94 PARTS LIST AND DIAGRAM 96 CONTENTS AW NO 0015E RAS E10H2 RAC E10H2 RAS E10H2 RAC E10H2 RAS E10H2 RAC E10H2 W A kW B T U h W A kW B T U h W H D kg DC INVERTER WALL TYPE TYPE MODEL POWER SOURCE TOTAL INPUT TOTAL AMPERES CAPACITY TOTAL INPUT TOTAL AMPERES CAPACITY DIMENSIONS mm NET WEIGHT COOLING HEAT...

Page 2: ...uch as electrical shock leak of current or bodily injury due to the drop of any part 8 To check the insulation of the unit measure the insulation resistance between the power cord plug and To check the insulation of the unit measure the insulation resistance between the power cord plug and T grounding terminal of the unit The insulation resistance should be 1MΩ or more as measured by a 500V DC meg...

Page 3: ...ds should be handled in the same way 2 When any part is handled uncovered in counting packing and the like the handling person must always use himself as a body earth Make yourself a body earth by passing one M ohm earth resistance through a ring or bracelet 3 Be careful not to touch the parts with your clothing when you hold a part even if a body earth is being taken 4 Be sure to place a part on ...

Page 4: ...rcuits 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 Bare copper wire for body earth Metal plate of Al stainless steel etc Working table Resistor 1MΩ 1 2W Earth wirte Staple Fig 3 Grounding of the working table soldering iron Grounding wire Screw stop at the screwed part using a rag plate 2 ...

Page 5: ...is occasion that the cooling and heating operation does not start for 3 minutes it is not abnormal and this is the result of the operation of IC delay circuit This IC delay circuit ensures that there is no danger of blowing fuse or damaging parts even if operation is restarted accidentally 5 This room air conditioner should not be used at the cooling operation when the outside temperature is below...

Page 6: ...H TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL 40 W NO NO NO ASC092CD YES YES 3 0A G4A NO NO YES NO 450NR YES YES IC NO WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE UNIT PIPES MAX 20m REFRIGERANT CHARGING VOLUME Refrigerant 410A RAC E10H2 820g RAS E10H2 PWM DC35V NO NO NO NO NO NO NO YES NO NO NO NO YES IC YES YES 4 ...

Page 7: ...ket where this cab k le is plugged In addition wire the cable with some allowances to prevent the cable from stretching Not doing so will cause an electrical shock heat generation or fire PROHIBITION Do not put objects like thin rods into the panel of blower and suction side because the high speed fan inside may cause danger an inside may cause danger an inside ma Do not bundle the power cable pul...

Page 8: ...idifying operation is performed warm air blows RAC E14H2 RAC E10H2 5 INDOOR UNIT INDICATIONS TIMER LAMP Orange This lamp lights when the timer is working FILTER LAMP Green FILTER LAMP Green FIL When the device is operated for a total of about 200 hours the FILTER FILTER FIL lamp lights indicates that it is time to clean the filter The lamp goes out when the AUTO SWING button is pressed while the o...

Page 9: ...ut 3 minutes unless you turn the power switch off and on or unplug the power cord and plug it in again This is to protect the device and does not indicate a failure If you press the FUNCTION selector button during operation the device may stop for about 3 minutes for protection AUTO HEAT DEHUMIDIFY COOL FAN FAN SPEED LOW MED HI SLEEPING STOP CANCEL START RESERVE START STOP TIME TIMER SET TIMER SEL...

Page 10: ...ost forms on the heat exchange of the outdoor unit for 5 10 minutes each time During defrosting operation the operation lamp blinks in cycle of 3 seconds on and 0 5 second off The maximum time for defrosting is 20 minutes If the piping length used is longer than usual frost will likely to form 9 DEHUMIDIFYING OPERATION Use the device for dehumidifying when the room temperature is over 16 C When it...

Page 11: ...EMPERATURE TEMPERA buttons the display indicates the setting The temperature setting and the actual room temperature may may ma vary somewhat depending on conditions 3 As the settings are stored in memory in the remote controller you only have to press the STAR STAR ST T STOP button next time 11 Press the STAR STAR ST T STOP button Fan operation starts with a beep Press the button again to stop op...

Page 12: ...t time setting press the TIME button twice The setting of the current time is now complete AM PM PM PM Example The current time is 1 30p m 2 Set the turn off time with the TIMER control button PM 3 Point the signal window of the remote controller toward the indoor unit and press the RESERVE button The OFF mark starts lighting instead of flashing and the RESERVED sign lights A beep occurs and the T...

Page 13: ...ard 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 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 dew may drop w may ...

Page 14: ...2 CLEANING OF FRONT PANEL ONT PANEL ONT P Remove the front panel and wash with clean water Wash it with a soft sponge After using neutral detergent wash thoroughly with clean water When front panel is not removed wipe it with a soft dry cloth Wipe the remote controller thoroughly with a soft dry cloth Wipe the water thoroughly If water remains at indicators or signal receiver of indoor unit it cau...

Page 15: ...the fan speed sets to LOW regardless of the preset speed The remote controller display indication will remain unchanged even with the LOW setting TIMER PROGRAMMING SLEEP TIMER OPERATION PROHIBITION 19 REGULAR INSPECTION PLEASE CHECK THE FOLLOWING POINTS EVERY EITHER HALF YEARLY YEARLY YEARL OR YEARLY YEARLY YEARL CONTAC CONTAC CONT T YOUR SALES A YOUR SALES A Y GENT SHOULD YOU NEED ANY HELP YOU NE...

Page 16: ...hanges due to power variations according to room temperature changes Mist is generated as the air within the room is suddenly cooled by conditioned air Water Water W generated during defrosting operation evaporates and steam is emitted Caused as the smells and particles of smoke food cosmetics etc present in room air become attached the unit and blown off into the room again Defrosting is underway...

Page 17: ...Mounting plate Wireless remote controller Cabinet 280 50 22 60 60 190 400 70 70 190 Vertical air deflector Drain Drain hose Drain cap connection port When piping is drawn from the left side exchange the drain hose for the drain cap Narrow pipe φ6 35 Wide pipe φ9 52 About 370 About 108 About 70 Power cord Connecting cable 30 56 17 5 81 5 47 47 147 210 47 5 60 11 60 5 47 15 ...

Page 18: ...700 498 7 30 Fixing hole Holed for anchor bolt 2 ø12x16slots for ø8 0 bolt Notch for anchor bolt for 2 ø8 bolt 100 500 Drain hole 9 9 282 300 68 768 768 Air suction Air outlet Air suction 100 100 Service space Rear side 150 More than More than More than 200 More than 400 OUTDOOR UNIT 16 ...

Page 19: ...5 OFF 32 0 89 6 35 3 95 5 RED WHT YEL 35V 5V 0V 0 5V FG MODEL NAME RATING APPLICABLE MODELS REVERSING VALVE COIL 135Ω 20 C RAC E10H2 REACTOR L1 13 mH 0 224Ω RAC E10H2 REACTOR L2 25 5 mH 0 37Ω RAC E10H2 FILM CAPACITOR 45 µF RAC E10H2 RAS E10H2 POWER SOURCE DC 5V 35V OUTPUT 25W 40W Control circuit built in BLU BLUE YEL YELLOW BRN BROWN WHT WHITE GRY ORN ORANGE GRN GREEN RED RED BLK BLACK PNK VIO VIO...

Page 20: ... 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 2M 1 40 2M 1 15 U V W M M M WHITE WHITE COMPRESSOR YELLOW YELLOW RED RED FRONT SIDE OF OUTDOOR UNIT RAC E10H2 ASC092CD 800W DC 220 350 V Compressor Motor Specifications 18 ...

Page 21: ...ＡＰＡＣＩＴＯＲ３７５μＦ２ＩＣＰＲＥＬＡＹＰＯＷＥＲＲＥＬＡＹＲ００７３ＡＦＵＳＥＣ０１１Ｌ１０１Ｃ００３Ｃ００２Ｃ００１ＶＳ１ＳＡ１１５ＡＦＵＳＥＷＨＴＹＥＬＯＲＮＢＬＵＢＲＮＲＥＤＤＩＯＤＥＳＴＡＣＫＤＢ１ＳＷＩＴＣＨＩＮＧＰＯＷＥＲＳＵＰＰＬＹＷＨＴＢＬＫＲＥＤＲＥＤＲＥＤＲＥＤＧＲＹＧＲＹＧＲＹＧＲＹＢＬＫＢＬＫＥＸＰＡＮＳＩＯＮＶＡＬＶＥＥＬＥＣＴＲＩＣＢＬＫＷＨＴＢＲＮＲＥＤＧＲＮ１ＲＥＶＥＲＳＩＮＧＶＡＬＶＥＯＶＥＲＨＥＡＴＴＨＥＲＭＩＳＴＯＲＤＥＦＲＯＳＴＴＨＥＲＭＩＳＴＯＲＩＮＤＯＯＲＵＮＩＴＴＥＲＭＩＮＡＬＢＯＡＲＤＤＩＯＤＥＳＴＡＣＫＴＥＲＭＩＮＡＬＢＯＡＲＤＴＨＥＲＭＩＳＴＯＲＢＬＫＷＨＴＧＲＮＹＥＬＢＲＮＲＥＤＩＮＤＯＯ...

Page 22: ...42 SEG41 SEG40 P40 P41 P42 P43 P00 P01 P02 P03 P10 P11 P12 P13 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 BEEP P20 P30 P31 NCVL C1 VL C2 VL C3 XC IN XC OUT VDD X OUT X IN RESET CARR P23 P22 P21 VSS IC 1 M3455OM6A 504FP LCD 1 C8 50v 1u K 1 D3 RB425D 1 2 K2K3 K4 K5 P10 P11 P12 K6 K7 K8 K9 K10 K11K12 K18 K17 K15 K16 K13 K14 D0 D1 D2 D3 R1 100k SW1 R2 P 100k R3 100k R4 100k R5 Q1 2SC3443 or 2SC2982 R6 R7 R9 D2 D1 ...

Page 23: ... 21 RAS E10H2 MODEL Control P W B Auto sweep motor Indicating P W B Light receiving unit ...

Page 24: ...０１Ｒ２５６５Ｖ０Ｖ０ＶＣ２１３Ｒ２５５Ｑ２０５Ｒ２５４Ｒ２５７Ｃ２１４６０Ｖ５ＶＲ２６１Ｃ２１６Ｒ２６０Ｒ２５９Ｒ２６２Ｒ２６３４ＩＣ５１２Ｄ２０６Ｒ２５８５ＶＲ６０１Ｒ６０２Ｒ６０３１２Ｖ１１２３２１３７６５４１１１０Ｃ６０８Ｒ６０８Ｒ６０９Ｒ６１０Ｒ６１１Ｃ６０４Ｃ６０３Ｃ６０２Ｃ６０１Ｒ６０４Ｒ６０５Ｒ６０６Ｒ６０７１４９８ＩＣ３Ｒ６１２Ｒ６１３Ｄ２０８Ｃ２２５Ｒ２８７０ＶＣ２２６１０Ｖ１２Ｖ０ＶＲ２８４Ｒ２９２０ＶＣ２１５８５ＶＲ２８６Ｒ２８８Ｒ２８９０Ｖ０Ｖ０ＶＲ２６８Ｑ２０４５Ｖ０Ｖ１２Ｖ５ＶＣ２００Ｃ２０１２６２３２５２５２４２８２７４６４７４５４４３１３０２０２１２...

Page 25: ...tection circuit HARMONICS IMPROVEMENT CIRCUIT IPM Rotor magnetic pole position detection circuit lp ld ls Buzzer circuit Indicating lamp Indoor Outdoor interface circuit DC fan moter drive circuit Microcomputer clock circuit Indoor DC fan moter Overheat thermistor Defrost thermistor Outdoor temperature thermistor Indoor Outdoor interface circuit Reversing valve coil Power circuit Reset circuit Out...

Page 26: ... 27 button MODEL RAS E10H2 BASIC MODE 29 31 31 31 35 33 ...

Page 27: ...1 CMAX 3200 min 1 CMAX2 3200 min 1 CSTD 2900 min 1 CKYMAX 2700 min 1 CJKMAX 2500 min 1 CBEMAX 2300 min 1 WMIN 2200 min 1 CMIN 2200 min 1 STARTMC 90 Seconds DWNRATEW 80 DWNRATEC 60 SHIFTW 2 00 C SHIFTC 1 33 C CLMXTP 30 00 C YNEOF 25 00 C TEION 5 00 C TEIOF 9 00 C SFTDSW 1 00 C DFTIM1 43 Minutes DFTIM2 60 Minutes ...

Page 28: ...minutes 5 During normal cooling mode compressor maximum rpm CMAX will maintain for 60 minutes if indoor temperature is lower than CLMXTP No time constrain if indoor temperature is higher than CLMXTP 6 7 When fan is set to Med compressor rpm will be limited to CJKMAX 8 When fan is set to Lo compressor rpm will be limited to CBEMAX 9 During Cool Dashed when room temperature reaches set temperature 1...

Page 29: ... is cleared 1 33 C 0 66 C Notes 1 The operation is done assuming as the preset temperature room temperature at the time 2 C 2 The indoor fan is operated in the Lo mode During thermo OFF indoor fan will be OFF for 5 3 When the operation is started by the themostat turning ON the start of the indoor fan is delayed 32 seconds after the start of compressor operation 4 The compressor is operated forced...

Page 30: ...rature SFTDSW ii Thermo off 3 During Hot Dashed operation thermo off temperature is set temperature with shift value 3 C After thermo off operation continue in Fuzzy control mode 4 Compressor minimum ON time and OFF time is 3 minutes 5 During normal heating mode compressor maximum rpm WMAX will maintain for 120 minutes if indoor temperature is higher than 18 C No time limit constrain if outdoor te...

Page 31: ...resh defrosting 5 Auto refresh defrosting cannot be engaged within 15 minutes after operation is started or defrosting is finished Sleep Lo Notes 1 The sleep operation starts when the sleep button is pressed 2 When the sleep button is set the maximum compressor speed is limited to WBEMAX and the indoor fan is set to sleep Lo 3 The indoor fan speed does not change even when the fan speed mode is ch...

Page 32: ... 36 REFRIGERATING CYCLE DIAGRAM MODEL RAS E10H2 RAC E10H2 φ9 52 φ8 0 φ8 0 φ7 0 φ6 35 φ6 35 φ4 76 φ9 52 φ8 0 φ8 0 φ7 0 φ6 35 φ6 35 φ4 76 SUCTION TANK SUCTION TANK ...

Page 33: ...ON ON ON 5V voltage rises and reaches 4 4V 4 4V 4 4V pin 1 of IC521 is set to Hi At this time the microcomputer starts operation When power OFF voltage drops and reaches 4 2V 4 2V 4 2V pin 1 of IC521 is set to Low This will RESET the microcomputer Power OFF Power ON Reset enter at 4 2V Reset release at 4 4V Voltage Voltage Voltage supply to pin 2 of IC521 Voltage at pin 7 of microcomputer 5 0V Fig...

Page 34: ...quare signal is output from buzzer output pin 30 of the microcomputer After the amplitude of this signal has been set to 12Vp p by IC711 it is applied to the buzzer The piezoelectric element in the buzzer oscillates to generate the buzzer s sound GND VOUT C212 C211 R212 0V 0V 0V R211 0V ZD141 R141 R611 C611 0V RECEIVER I P Microcomputer 13 BZ1 R721 12V IC711 Microcomputer Buzzer output 16 1 30 BZ ...

Page 35: ...ite to turn the rotor Table 4 1 shows the rotation angle of horizontal air deflectors Microcomputer 18 17 16 15 11 10 12 6 7 5 13 4 IC711 12V CN4 Rotor Auto sweep motor for horizontal air defectors Micro computer pins Step width 10ms Horizontal air deflectors 15 16 17 18 1 2 3 4 5 6 7 8 Table 4 1 Auto sweep Motor Rotation Rotation angle per step Time per step ms 0 0882 10 Horizontal air deflectors...

Page 36: ...C DC converter and the 35 V power supply from the outdoor unit to generate 12 V control power which drives the stepping motor during the operation In addition use the regulator IC 121 to generate 5 V power required for driving the micro computer and controlling fan motor If the terminal block was overheated due to a connecting cable improper connection the thermal fuse built in the terminal block ...

Page 37: ...pulse of the speed which is input into the pin 14 on the micro computer This pulse is equivalent to a frequency of 12 60 speed Example 1000 min 1 x 12 60 200 Hz The micro computer monitors the frequency and adjusts command speed stopped temporarily as fan lock error After 10 seconds restart the output of the pulse If fan lock error is detected twice within 30 minutes all units are stopped and the ...

Page 38: ...rent When the current runs through the L1 is taken for I1 and the current runs through the L2 is taken for I2 as shown in Fig 1 2 I1 becomes an input current to the capacitor which peak value was crushed by the L1 and I2 becomes a resonance current which causes the LC resonance using the L2 and C023 By combining the I1 and I2 the input current from the main power shapes a waveform shown in the rig...

Page 39: ...ring operation of compressor and also absorb external noise entering from power line to protect electronic parts Be sure to connect the earth cable between the indoor unit and the outdoor unit Otherwise the noise filter circuit won t operate properly 6 SA1 and VS1 to VS3 These surge absorber and varistors absorb external power surge such as induced thunder Be sure to connect the earth cable betwee...

Page 40: ...on the outdoor microcomputer is designed so that it cannot receive a signal while it is outputting a request signal The receiving circuit in the indoor unit consists of a comparator and transistor The interface signal from the outdoor unit on the DC 35V line is supplied to C821 where DC components are eliminated and is then shaped by the comparator The shaped signal is detected by diode amplified ...

Page 41: ...１４Ｒ２５６ＲＲ２５５Ｃ２１３Ｄ２０６Ｒ２５７Ｒ２５４Ｑ２０５ Ⅰ Ｃ５１２５ＶＲ２６３３５１４４８８２８８２７ Micro Computer HIC TERMINAL BOARD Communications from indoor microcomputer to outdoor microcomputer Communications from outdoor microcomputer to indoor microcomputer Fig 2 1 Indoor Outdoor interface circuit ５５ Fig 2 1 shows the interface circuit used for the indoor and outdoor microcomputer...

Page 42: ...in 50 Pin 49 Fig 2 2 Voltages Waveforms of Indoor Outdoor Microcomputers Outdoor to Indoor Communications Fig 2 3 Voltages Waveforms of Indoor Outdoor Microcomputers Indoor to Outdoor Communications Outdoor microcomputer Pin 48 Pin 51 Indoor microcomputer Pin 50 Pin 49 Outdoor microcomputer Pin 48 Pin 51 Indoor microcomputer Pin 50 Pin 49 Outdoor microcomputer Pin 48 Pin 51 Indoor microcomputer Pi...

Page 43: ...0ms Leader 100ms When reset approx 100ms When reset approx 10ms 35 V 34 V 36 V 0 7 0 7 7 7 0 33 3ms 3 2 1 NO 0 Bit No 0 7 0 7 0 7 0 7 Bit No 0 3 2 1 33 3ms 33 3ms 33 3ms Transmit receive switching time 4 95ms 33 3ms 33 3ms Outdoor message Indoor message 33 3ms 33 3ms 0 Character No 1 frame 100ms 33 3ms 8 4 95ms 371 35ms 2 Indoor microcomputer to outdoor microcomputer HIC 2 Indoor microcomputer to ...

Page 44: ...n bit Capacity code 0 LSB Capacity code 1 Capacity code 2 Capacity code 3 MSB During forced operation Defrost request signal Self diagnosis 1 Self diagnosis 0 LSB Outside temperature 0 LSB Actual compressor rotation speed 0 LSB Compressor command speed 0 LSB Compressor minimum rotation speed 0 LSB Compressor minimum rotation speed 1 Compressor minimum rotation speed 2 Compressor minimum rotation s...

Page 45: ... ３Ｌ２ＤＢ３Ｒ００８Ｃ０２２Ｃ０２１Ｃ１００Ｒ００１ Intelligent power module U coil V coil W coil DC compressor motor Fig 3 1 System power module circuit U is ON V is ON 3 Intelligent power module circuit IPM circuit Fig 3 1 shows peripheral circuits of intelligent power module IPM In the diagram U V and W are called the upper arm U V and W the lower arm 49 ...

Page 46: ... U transistor is ON U transistor U coil V coil V transistor transistor DC current detection resistor Point B Fig 3 3 2 When U transistor is OFF by inductance of motor coil U coil V coil V transistor transistor V Time W T V U V Upper arm transistor Lower arm transistor W W U E F E F W W V V Fig 3 2 Switching order of power module Fig 3 3 Voltage waveform at each point U transistor chopped Chopping ...

Page 47: ...rrent waveform at point B 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 y using DC current Id y Table 3 1 Ip peak current cut LD301 Blinks 2 times Blinks 3 times Blinks 4 times LD301 LD301 Self diagnosis Self diagnosis lamp and mode Abnor...

Page 48: ...rter drives and the peak current is detected IPM outputs Fail signal Pin 24 Active Lo and lower arm IGTB is forcibly turned off inside IPM at the same time At this time all microcomputer signals of upper and lower arms are shut off by IC9 and D501 ４６５２３１３３４４３３２２３３３３３１３３５５Ｒ００１６ Ⅰ ＰＭＨ Ⅰ Ｃ７８９１１００１１７２１１１４５０Ｖ Ⅰ Ｃ９Ｃ２０２５ＶＲ５０７Ｒ５０８Ｒ５０９Ｄ５ ...

Page 49: ... 5V 0V V W U U 15V 0V U V W V W V W 5V 0V V W U U 15V 0V U V W V W V W Fig 4 2 Fig 4 3 In low speed operation In high speed operation Drive signal at point A Internal drive signal of IGBT Drive signal at point A Internal drive signal of IGBT 120 120 120 120 120 53 ...

Page 50: ...g 5 1 peripheral circuits and IPM driver circuit and as well as DC 35V are produced ell as DC 35V are produced ell as DC 35V by switching power circuit Switching power circuit performs voltage conversion effectively by switching transistor IC1 to convert DC 330V voltage to high frequency of about 20kHz to 200kHz AC220 230V C012 C013 14 54 ...

Page 51: ... power circuit is normal Check the removed loads If any error is found in this step the power circuit has any failure Replace the MAIN P Replace the MAIN P Replace the MAIN W P W P B A short circuited load may cause an output error not only in the load but also in the others Be sure to check all outputs of the loads k all outputs of the loads k all outputs of the loads Be sure to wait 15 minutes o...

Page 52: ... ６６４４４４７７７２２４４４１１２２５ 6 Peripheral circuits of microcomputer Fig 6 1 shows the microcomputer and its peripheral circuits Table 6 1 shows the basic operation of each circuit block and Fig 6 2 shows the system configuration IPM Intelligent Power Module Detection resistor DC current DC voltage Fig 6 1 Peripheral circuits of microcomputer Table 6 1 Circuit block Peak current cutoff ci...

Page 53: ...3 shows the peak current cutoff circuit and waveforms at each section Voltage at point Voltage at point Main P W B HIC Outdoor microcomputer Ip cut circuit detects instantaneous large current and operates to protect various parts such as IPM by stopping inverter When current exceeding 25A flows as shown in the diagram voltage at point A detected by detection resistor is divided by R906 and R905 an...

Page 54: ...m air conditioner system through the current sensor CT1 in order to keep the maximum rating of components by reading total operating current ID OVL is watching and limits the compressor current through the detection resistor which is built in IPM in order to control the compressor reliability reliability reliability Since the compressor reliability is related with its curve All of OVL operation va...

Page 55: ...alues which vary according to the rotation speed When the DC current level exceeds the set value the microcomputer enters the overload control state The set Value is determined by the amplification of the voltage amp circuit Amplification high DC current low Amplification low DC current high Fig 6 7 2 ID OVL Fig 6 5 The filter consisting of R245 and C217 removes high harmonic frequencies from the ...

Page 56: ... DC voltage multiplied by DC current R247 R248 R249 are provided to perform the same overload judgement even when the voltage varies It is required to maintain the start current DC current constant to smooth the start of the DC motor of the compressor RAC E10H2 uses software to control the start current The start current varies when supply voltage varies This control method copes with variations i...

Page 57: ...e and 5V line voltages rise and 12V line voltage reaches 10 9V an reset voltage input to pin 7 of microcomputer is set to Hi Reset voltage will be hold Hi until the 12V line voltage drops to 9 90V even though the power shuts down Fig 6 10 Fig 6 11 HIC Microcomputer RESET OUT RESET 19 7 C204 0V R252 1 0V 8 2 3 IC5 1 2 5V D208 R287 C215 R284 R286 C225 R285 C226 R292 R289 R288 0V 0V 0V 0V 12V 12V lin...

Page 58: ...ol During defrosting operation the microcomputer transfers the defrosting condition command to the indoor microcomputer via the circuit interface transfers it to the indoor unit thus controlling the compressor rotation speed according to the value set at the EEPROM in the indoor unit and switching switching s the operation status outdoor fan on off etc in the dehumidifying mode The follo The follo...

Page 59: ...ally ON close Table 6 3 shows the circuit operation of each operation mode If the following result is not obtained reversing valve control circuit may be defective Table 6 3 Point Operation mode Cooling In normal cooling operation In normal heating operation In defrosting operation approx 35 V approx 35 V 0V Hi 0V Hi 12V Lo 0V not fixed Heating Between Pin 29 of microcomputer and 0V Between Pin 32...

Page 60: ...ve Microcomputer Valve 4 Valve 3 Valve 2 Valve 1 Electric expansion valve is driven by B 12V Opening of the valve is controlled by feeding power to 1 or 2 phases of the 4 phase coil to switch the polarity of the coil The relation between the conducting phase switching direction and open close direction is as shown below When the power is turned on approx 0 9 V is applied to CN15 pins 1 to 4 when n...

Page 61: ... feedback Slower Instruction Faster Increase pulse width FG pulse is also used for Fan Motor failure detection Microcomputer will monitor FG pulse 30 seconds after start the fan motor If there is no signal detected it will consider that the Fan Motor was malfunction and stop the operation In this case LD302 on main R107 and IC4 are used for Fan Motor over current Vsp high Faster Vsp low Vsp low V ...

Page 62: ...or unit by snowing unit will be restart again after a while In case of Fan Lock Stop even though the DC Fan Motor is rotating correctly correctly correctly the possible cause in Fan Motor problem or control board problem Stop after the Fan motor runs 2 minutes Fan Motor may be broken Caution Please take care for the electrical shock by high voltage of DC Fan Motor power source which is common with...

Page 63: ... is preset at 30 Check if the indoor heat exchanger is frosted Wait for 3 4 minutes until it is defrosted If the air conditioner operates in cooling mode when it is cold the evaporator may get frosted It occurs during defrost ing Wait for 5 10 minutes until the condenser is defrosted At the beginning of heating the fan speed remains LOW for 30 seconds If HIGH is selected it switches to LOW and aga...

Page 64: ...fore stopping operation At this point fan speed is automatic This is because Nice temperature reservation function is operating This function starts operation earlier so the preset temperature is reached at the preset time Operation may start maximum 60 minutes before the preset time It does not work It works only during cooling and heating This is because Nice temperature reservation function is ...

Page 65: ...st the temperature within a range of 3 C by pressing the Room Temperature button If the temperature is 1 C higher than the auto preset temperature 1 C will appear If the temperature is 1 C lower than the auto preset temperature 1 C will appear heard when operation is started When operation is started the compressor rotation speed goes to maximum to increase the heating or cooling capability so noi...

Page 66: ...round it Don t forget that high voltage as noted in the figure above may apply to the oscilloscope Remember that voltage of 175 V is applied to the 0V line on the P W B or the like as shown in the right diagram Indoor Controller Outdoor Controller Power Switch Point 400 F I P M Compressor motor Point line Control P W B Main P W B Voltage at point A Ground voltage Grounding 350V Point B 0V line Pow...

Page 67: ... smoothing capacitors Discharge Procedure 1 Turn off the power of the indoor unit or pull out the power supply plug 2 After power is turned off wait for 10 minutes or more Then remove electrical parts cover and apply soldering iron of 30 to 75 W for 15 seconds or more to TAB05 and R001 TAB05 and R001 T terminals on the main P W P W P B as shown in the figure below in order to dischargevoltage in s...

Page 68: ...ctors from the CN1 heat exchange thermistor CN4 stepping motor and CN10 fan motor 3 Remove two lock screws 4 Remove the electrical parts in the direction of arrow Removing control P W B W B W 1 Remove the connectors from the CN2 and CN3 2 Remove the P W B from the P W B support MODEL RAS E10H2 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS ELEC COVER P W B SUPPORTER P W B SUPPORTER P W B SUPPORTER P W...

Page 69: ...edance When a probe such as a multimeter circuit causing the ICP1 blowout and Q111 failure 4 During power feeding to the P W B do not remove and insert the CN10 fan motor connector 2 The CN3 power supply and CN10 fan motor are the connectors with lock mechanism Press the lock with your fingers to unlock and remove the connector 3 When checking the voltage and waveform do not connect the probes to ...

Page 70: ...modes only the retry operation is repeated without lamp indication Failure modes that will repeat a retry operation without the indoor unit lamp indication are as follows OH thermistor temperature rise Outdoor unit communication error Power voltage abno wer voltage abno wer v rmal Less frequent defects The LD301 indicates a mode of failure detected on the outdoor unit side by blinking frequency li...

Page 71: ...hanger thermistor disconnected only in the heating mode Note The malfunction mode is entered the 3rd time this abnormal indication appears read every 3 minutes Electrical parts in the outdoor unit 1 Indoor interface circuit 2 Outdoor Outdoor unit electrical components For details operate again using remote comtroller and check from self diagnosis display of outdoor unit interface circuit 1 Room th...

Page 72: ...ＥＸＰＯＳＥＤＴＯＤＩＲＥＣＴ１ＯＵＴＤＯＯＲＵＮＩＴＩＳＥＸＰＯＳＥＤＴＯＤＩＲＥＣＴ１ＳＵＮＬＩＧＨＴＯＲＩＴＳＡＩＲＦＬＯＷＢＬＯＣＫＥＤ４ＴＨＥＶＯＬＴＡＧＥＩＳＥＸＴＲＥＭＥＬＹＬＯＷ６ＴＩＭＥＳＯＨＴＨＥＲＭＩＳＴＯＲＴＥＭＰＲＩＳＥ７ＴＩＭＥＳＴＨＥＲＭＩＳＴＯＲＡＢＮＯＲＭＡＬ１ＴＨＥＲＭＩＳＴＯＲ２ＣＯＮＮＥＣＴＩＯＮＯＦＴＨＥＲＭＩＳＴＯＲＤＥＦＥＣＴＩＶＥ３ＴＨＥＲＭＩＳＴＯＲＣＩＲＣＵＩＴ８ＴＩＭＥＳ１ＬＥＡＫＯＦＲＥＦＲＩＧＥＲＡＮＴ２ＣＯＭＰＲＥＳＳＯＲ１３ＴＩＭＥＳ１０ＴＩＭＥＳＥＸＡＭＰＬＥＯＦＢＬＩＮＫＩＮＧ５ＴＩＭＥＳ２ＳＥＣＬＩＧＨＴＳＦＯＲ０２５ＬＩＧＨＴＳＦＯＲ０２５ＳＥＣＡＴＩＮＴＥＲＶＡＬＳＥＣＡＴＩＮＴＥＲＶ...

Page 73: ...frigerating cycle Normal No Yes Check the drive circuit IMP using the PRD checker Check the position sensor circuit With the unit set in the operating state press the start stop button Does the unit operate for approximately 2 seconds the LD303 coming on and then stop due to a failure of switching the lamp blinking 4 times OUTDOOR UNIT LD303 LD302 LD301 MAIN P W B SERVICE SWITCH HIC IPM 77 ...

Page 74: ...ing cable connected incorrectly inserted incompletely or disconnected Not running Running Open the outdoor unit and observe the self diagnosis lamp LD301 Count how many times the lamp blinks Blinks other than 1 time Blinks 1 time Can the unit be operated using the outdoor unit service switch See the nameplate on the outdoor unit for operating instructions Check the outdoor electrical parts Check t...

Page 75: ...door unit connection cable and correct any defective section wrong connection incomplete insertion Is AC220 230V being generated between terminals A and B on the outdoor unit terminal board Is DC35V or 20V being generated between terminals C and D on the indoor unit terminal board Is the microcomputer reset input pin 7 Hi Is the microcomputer clock signal generated normally Is DC35V is being gener...

Page 76: ...ation check Are pulse signals output at microcomputer pins 15 18 when auto swing is turned on in the fan mode Replace the microcomputer Is a voltage over 15 or below 10V being generated on the 12V line No No No No Perform final operation check output at pin 24 is 1 5V Check IC711 If it is normal replace the air deflector motor Replace IC111 3 Air deflector does not move others are normal Yes Yes Y...

Page 77: ... board Insert the connection cable securely Replace IC121 Check if a short occurs in the 5V line If the 5V line is shorted ICP1 will be open again Check to see if the connection cables are disconnected or reversed If normal check the outdoor unit P W B Has the terminal board thermal fuse blown open Replace Q111 and IC111 Is DC5V being generated Perform final operation check When the unit is not in...

Page 78: ...e sensible area should flash in orange when you operate the remote control unit if it is good Ultra redray test card Sensible area Within 2 cm Check functions again If it does not work replace the remote controller Buzz Within 15 cm AM radio Check the LED D1 with a multimeter Replace the battery Install the battery in the correct polarity Yes Yes No No No Yes Does the radio buzz noisily Is battery...

Page 79: ...o be defective Replace defective parts Is the power circuit normal See the description on power circuit for details Is the switching power circuit OK Has the 3A fuse blown Check to see if C and D cables are connected correctly If reversed or incompletely inserted correct the cable connection Replace any defective parts If the 3A fuse has blown the varistor 2 etc may also be defective With the pipi...

Page 80: ...after the fan operates for 2 minutes Is the voltage between 4 and 6 at CN24 normal Normally the voltage is above approx DC1 7V Connect the connector Remove any obstructions Replace the fan motor and main P W B Is the voltage between 4 and 7 at CN24 normal Check to see if the voltage is within 2 5V 0 5V using a tester In effect the output voltage is alternately switched between 5V and 0V Replace th...

Page 81: ...erminals A and B on the terminal board Apply AC220 230V Check the interior wiring TAB05 TAB11 reactor and C023 yellow green connected properly Connect properly Replace the main P W B Possible causes include Power relay malfunction Defective microcomputer terminal Yes Yes Yes No No No 85 ...

Page 82: ... Is DC35V being output between terminals C and D Normal DC32V 39V Is DC35V being output at both ends of R35 Connect properly Replace the main P W B Defective SW power supply Replace the main P W B NF coils IF coils etc may be broken Check the interface circuit and replace the main P W B if needed No No No No Yes Yes Yes Yes 86 ...

Page 83: ...ting to connect after servicing Is the continuity of the thermistor normal Is the thermistor circuit normal Connect the thermistor Replace the thermistor Replace parts in the thermistor circuit Check continuity of pattern and lead wires according to the P W B and schematic diagrams Yes Yes Yes No No No No 87 ...

Page 84: ...lter Check the outdoor unit for defective shielding LD301 blinks 4 times Failure of switching Is the 15V power supply output normal Main P W B display Is the intelligent power module IPM normal Inverter section The intelligent main module may be defective Replace the main P W B See System Power Module Diagnosis With CN3 and CN4 disconnected is the 15V output between 15V and 15 0V on the main P W B...

Page 85: ... W B LD301 blinks 1 time Reset stop However the unit always resets and stops just after power is supplied this does not indicate a fault Is the reset circuit normal Normally pin 7 of CN18 is approx 5V Replace the main P W B Make sure again that connectors are connected securely Perform final operation check Yes Yes Yes No No 89 ...

Page 86: ...If the compressor checker for an inverter type air conditioner is available re check using it JUDGING BETWEEN GAS LEAKAGE AND COMPRESSOR DEFECTIVE Blinking off Time until the lamp lights Approx 10 seconds Approx 10 seconds Approx 10 seconds Within Approx 30 seconds Compressor Compressor Gas leakage Possible malfunctioning part LD301 Self diagnosis lamp Lighting mode Blinks 2 times Blinks 3 times B...

Page 87: ...mall dia pipe side service valve using a pipe Parts to be prepared 1 Reducing union 2 8 6 35 mm 3 8 9 52 mm 2 Copper pipe 2 8 and 3 8 Connect the small diameter service value and the large diameter service valve using the reducing union and copper pipe as shown on the right Charge refrigerant of 300g The operation method is the same as How to operate using the connector to servicing the outdoor un...

Page 88: ...ule Terminal symbols of power module 6 PGU 12 PGV 18 PGW 21 NGU 22 NGV 23 NGW 24 Fail signal 31 P 32 U 33 V 34 W 35 N NGW NGV NGU PGW PGV PGU P U V W ＬＩＮ２ＦＯＬＩＮ３ＨＳＨＩＮＬＯ３３４ＬＯ１ＬＩＮ１ＨＳＨＯＨＯＨＩＮＨＩＮＨＯ３３ＬＯ２ＨＳ３２ N 28 26 24 22 20 18 16 12 10 6 4 1 27 25 35 34 33 32 31 N W V U P 23 21 15 13 9 7 3 ２４３５２３２２２１１８１２６３１ Model 92 ...

Page 89: ...s performed it is normal When a digital multimeter is used and terminals will be reversed since the orientation of built in battery is inverted Note If internal circuit of power module is disconnected open and pointer of the mutimeter does not swing it may be assumed to be normal If the pointer swings when and terminals are connected in reverse it is normal Compare swing statuses for U V and W pha...

Page 90: ...ng two screws pull the center of the front cover forward and release the claws 2 Hold the front cover at both lower sides and pull them forward to remove Fig 3 Indicating P W B Control P W B Support hook 3 Control P W P W P B and Indicating P W B 1 Remove each connector from the lead wire P W B 3 Pull the support hook at the upper side of the indication lamp of the Indicating P W B Fig 4 Procedure...

Page 91: ... screws 2 locations and radiation fin fixing screws 5 locations and remove the P W B from the support 1 Electrical Parts 1 Remove the upper cover fixing screws and lift the cover to remove it 2 Remove the service valve cover 3 Remove the terminal plate cover 4 Remove the right side cover 3 Remove the screws from the upper and lowerbearing covers 4 Remove the locking hook of the lower bearingcover ...

Page 92: ...INDOOR UNIT MODEL RAS E10H2 1 39 13 9 17 38 18 14 12 11 10 23 20 15 16 37 36 35 34 33 41 40 32 19 22 43 21 29 30 25 31 24 26 42 28 27 7 6 2 3 4 8 PARTS LIST AND DIAGRAM 96 ...

Page 93: ...SWICHI 20 1 P W B MAIN 21 HWRAS 25YH4 922 1 P W B INDICATION 22 HWRAS 25YH4 923 1 CONNECTING CORD 12PIN 23 HWRAS 25YH4 924 1 ELECTRIC PARTS COVER 24 HWRAS 25YH4 925 1 COVER TERMINAL 25 HWRAS 25YH5 907 1 DRAIN PAN 26 HWRAS 25YH5 908 1 HORIZONTAL AIR DEFLECTOR 27 HWRAS 25YH4 928 2 DEFLECTOR SUPPORT 28 HWRAS 25YH4 929 1 AUTO SWEEP MOTOR 29 HWRAS 25YH4 930 1 DRAIN CAP 30 HWRAS 25YH4 931 1 HEAT INSULAT...

Page 94: ...OUTDOOR UNIT MODEL RAC E10H2 2 19 18 50 4 3 6 17 20 12 16 8 13 14 7 35 36 39 25 33 30 40 38 35 29 41 51 39 36 46 44 37 27 45 32 31 47 42 10 5 9 43 1 24 23 22 21 28 98 ...

Page 95: ...PORT 22 HWRAC E10H2 915 1 FAN MOTOR 47W 1 4kg 23 HWRAC 25YH4 923 1 PROPELLER FAN 24 HWRAC 25YH4 924 1 NUT PROPELLER FAN 25 HWRAC E10H2 916 1 SIDE COVER L HWRAC E10H2 917 27 1 FRONT COVER 28 HWRAC E10H2 918 1 DISCHARGE GRILL 29 HWRAC E10H2 919 1 ELECTRIC PARTS PLATE 30 HWRAC E10H2 920 1 ELECTRIC PARTS COVER 31 HWRAC E10H2 921 1 TERMINAL PLATE 32 HWRAC 25YH4 932 2 TERMINAL BOARD 2P 33 HWRAC E10H2 92...

Page 96: ...UIT OPERATION 37 SERVICE CALL Q A 67 TROUBLE SHOOTING 70 PROCEDURE FOR DISASSEMBLY AND REASSEMBLY 94 PARTS LIST AND DIAGRAM 96 CONTENTS AW NO 0015E RAS E10H2 RAC E10H2 RAS E10H2 RAC E10H2 RAS E10H2 RAC E10H2 W A kW B T U h W A kW B T U h W H D kg DC INVERTER WALL TYPE TYPE MODEL POWER SOURCE TOTAL INPUT TOTAL AMPERES CAPACITY TOTAL INPUT TOTAL AMPERES CAPACITY DIMENSIONS mm NET WEIGHT COOLING HEAT...

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Hitachi RAC-E10H2, Service Manual

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