Hitachi RAC-25JX4 Service Manual Download Page 74

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Ð 79 Ð

This model uses DC Fan Motor which has a controller circuit built in the Motor.

This DC Fan Motor will rotate by control voltage apply to Vsp input. (Voltage range:1.7 to 7V DC)

Motor will output FG pulse by following this motor revolution.

indoor microcomputer.

This PWM control signal will convert to Vsp voltage by smoothing circuit (R242 & C209)

rotation speed.

DC Fan Motor circuit has to match the Fan Motor revolution with instructed revolution. Such as...

FG feedback:Faster Instruction:Slower ... Decrease pulse width

FG feedback:Slower Instruction:Faster ... Increase pulse width

FG pulse is also used for Fan Motor failure detection.

Microcomputer will monitor FG pulse 30 seconds after start the fan motor. If there is no signal detected,

it will consider that the Fan Motor was malfunction and stop the operation. In this case, LD302 on control

R107 and IC4 are used for Fan Motor over current.

Vsp high :Faster ;

Vsp low :slower ;

Vsp lower than 1.7V :stop

P.W.B. will blink 12 times. (Fan Motor lock detected)

FG pulse will feed back to Outdoor microcomputer 15 .

Outdoor microcomputer will output PWM control signal from 75 by following the instruction from

Fan motor will start to rotate when Vsp was proceeding over than 1.7V, and generate FG pulse by

10. Outdoor DC Fan Motor control circuit

Summary of Contents for RAC-25JX4

Page 1: ... 0 1 1 123 0 1 1 123 04 55 6 76 6 8 1 1 1 1 1 6 6 6 6 1 1 1 1 1 68 6 6 9 9 9 6 76 6 6 1 18 1 1 1 6 6 68 6 6 1 1 1 1 1 6 6 6 8 9 9 9 0 ...

Page 2: ...uring instruments for use in repairs or inspection should be accurately calibrated in advance 7 In installing the unit having been repaired be careful to prevent the occurrence of any accident such 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 grounding termina...

Page 3: ...d 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 a metal plate with ...

Page 4: ...king 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 Bare copper wire for body earth Metal plate of Al stainless steel etc Working table Resistor 1M9 1 2W Earth wirte Staple soldering iron Grounding wire Screw stop at the screwed part using a rag plate ...

Page 5: ...ccasion that the cooling and heating operation does not start for 3 minutes it is not abnormal and this is the result of the operation of IC delay circuit This IC delay circuit ensures that there is no danger of blowing fuse or damaging parts even if operation is restarted accidentally 5 This room air conditioner should not be used at the cooling operation when the outside temperature is below 10 ...

Page 6: ...WITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL 40W DC350V NO NO NO ATC092SD A8JT 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 870g RAS 25JX4 RAS 35JX4 RAC 25JX4 RAC 35JX4 25W DC35V NO NO Ñ NO NO NO NO NO YES NO NO NO NO ...

Page 7: ...ndle the power cable pull it put something on it heat it process it or put it between things Breakage of the power cable may result Use of a damaged cable may cause an electrical shock or a fire Do not put objects like thin rods into the panel of blower and suction side because the high speed fan inside may cause danger OFF PROHIBITION CONNECT EARTH LINE PROHIBITION PROHIBITION PROHIBITION PROHIBI...

Page 8: ...s set to ÒOperate Two Way Air ExchangeÓ How to open the front panel refer to page 10 If the remote controller does not work due to battery failure press this switch to start and stop operation This temporary operation will be at the most recent setting mode The unit will immediately go into automatic operation once power is switched on Turn off the circuit breaker or pull out the power plug if the...

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Page 16: ...evice will turn off at 11 00 p m The setting of turn off time is now complete Point the signal window of the remote controller toward the indoor unit and press the RESERVE button The ON mark starts lighting instead of blinking and the RESERVED sign lights A beep occurs and the TIMER lamp lights on the indoor unit Example The device will turn on early so that the preset temperature be almost reache...

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Page 21: ... operation heating cooling and dehumidifying operation when the heating cooling and dehumidifying of the device are combined is combined with the two way air exchange operation Page 18 When the air temperature outside the room is more than about 30 C or less than about 3 C the fresh air in does not operate to prevent dew condensation on the two way air exchange fan and hose and to save energy If t...

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Page 23: ... 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 as the heating operation is stopped the microcomputer checks frost accumulated in the indoor unit and instructs the unit to perform automatic defrosting if necessary Shows preheating or defrosting operation is underway As the protective circuit...

Page 24: ...binet 60 166 6 5 47 Wireless remote controller 60 28 Drain hose About 114 About 400 About 70 Power cord Connecting cable Drain cap connection port Narrow pipe φ6 35 Wide pipe φ9 52 Drain When piping is drawn from the left side exchange the drain hose for the drain cap 200 390 200 70 70 Vertical air deflector 47 47 36 60 16 70 80 MODEL RAS 25JX4 RAS 35JX4 INDOOR UNIT ...

Page 25: ...TDOOR UNIT 208 23 26 841 750 841 750 Handle Air suction 10 10 330 310 Drain hole Drain hole 500 125 12 35 Fixing hole Notch for anchor bolt for 2 φ8 0 bolt Holed for anchor bolt 2 φ12 16 slots for φ8 0 bolt Handle 202 335 288 27 5 19 5 10 91 548 528 5 19 5 162 5 50 Air outlet Rear side Air suction Unit mm ...

Page 26: ... 3 95 5 RED WHT YEL 35V 5V 0V 0 5V FG MODEL NAME RATING APPLICABLE MODELS REVERSING VALVE COIL 135 20 ûC RAC 25JX4 RAC 35JX4 REACTOR L1 13 mH 0 224 RAC 25JX4 RAC 35JX4 REACTOR L2 25 5 mH 0 37 RAC 25JX4 RAC 35JX4 FILM CAPACITOR 45 µF RAC 25JX4 RAC 35JX4 RAS 25JX4 RAS 35JX4 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...

Page 27: ...s 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 0 76 2M 0 63 U V W M M M WHITE WHITE COMPRESSOR YELLOW YELLOW RED RED FRONT SIDE OF OUTDOOR UNIT RAC 25JX4 RAC 35JX4 ATC092SD A8JT 750W DC 270 320 V Compressor Motor Specifications ...

Page 28: ...D RED RED BLK BLK GRY GRY WHT YEL BLU RED RED ＭＣＮ１１ＣＮ１ＣＮ４ＣＮ２ＭＣＮ１０３ＣＮ９３ＣＮ８ＣＮ５ＭＭ２３１９４ＣＮ７ＣＮ３ＣＮ８ＣＮ9 ＣＮ２ＡＢＤＣ１０１１１２３４５６７８９ＣＮ６ＴＥＳＴ BRN BLU LINE CORD GRN YEL HEAT EXCHANGER THERMISTOR GAS SENSOR INDICATING P W B SWITCH INDICATING RECIEVER ROOM TEMPERATURE THERMISTOR CONTROL P W B WIRELESS REMOTE CONTROL THERMAL FUSE 102 INDOOR FAN MO...

Page 29: ...tomatic two way air exchange Self clean Door shut Ð Ð Ð Ð Ð Ð Ð Auto mode Heating mode Door open Fan speed selection Fresh air in during sleep mode Off timer On timer Two way air exchange Room temperature down Room temperature up Door shut Ð Door open Ð Ð Ð Door shut Ð Ð D11 D10 D9 D8 Door open Hour up Hour down Door shut Door open Ð Door shut Ð D7 Key matrix table Remote Control RAR 3E1 1 0 6 ...

Page 30: ... １１６ＷＲ７６２１０ＫＣ０３０５１１６ＷＲ７６４１０Ｋ１０Ｋ５１１６Ｗ０３０１Ｋ５１１６Ｗ０３３ＣＣＣＣＣＣＣＣＣＣＣＣＣＲ９１１Ｒ９１２Ｒ９１４Ｒ９１５Ｒ９１６Ｒ９１７Ｒ９１８Ｒ９１９Ｒ９２１Ｒ９２２Ｒ９２３Ｒ９２４２７Ｋ３０Ｋ５５１１０Ｗ１１６Ｗ０１４０２９７５０５６０５５１８Ｗ１８Ｗ０１００１１０２４１１６Ｗ５６８Ｋ２１１６Ｗ１１６Ｗ２００７１４Ｗ５０６８１００５１１６Ｗ０４２０４３１１６Ｗ５３３Ｋ１００...

Page 31: ...２５Ｃ０１５０００１ＣＣ０１Ｃ２１９Ｃ０００１０００１０１Ｃ２５Ｃ２１８０１０００１ＣＣ０１２５Ｃ２２４ＣＣＣ２２２ＣＲＣ２２０Ｃ３０４Ｃ２５ＣＣＣＣ５０ＣＣ６０１５０５０ＣＣＣＣ６０５Ｃ６０３Ｃ５０１Ｃ５０ＣＣＣ５０２Ｃ５０Ｃ５０４Ｃ５０３Ｃ５０ＣＣ５０５Ｃ５０６ＭＭＭＭＭＭＣ１００ＣＲＭ００１Ｃ１１０ＭＲＲＣ０１２２５０２５０００１００１ＣＣ０１３ＣＡＣＡＣＰＰＡＣ４７０ｐ４７０ｐ４７０ｐＣ８ ...

Page 32: ...mote control towards the receiver on the indoor unit and change the address from A to B with the address changing switch Close the rear cover of the remote control and operate the remote control ordinarily to confirm that the address changing has been successfully made When carrying out the above procedures the power switch of indoor units of which setting is to remain unchanged should be set to Ò...

Page 33: ...Ð 33 Ð MODEL RAS 25JX4 RAS 35JX4 MAIN P W B MARKING ON P W B COMPONENT SIDE SOLDERING SIDE ...

Page 34: ...NENT SIDE VIEW COMPONENT SIDE SOLDERING SIDE COMPONENT SIDE VIEW MODEL RAS 25JX4 RAS 35JX4 COMPONENT SIDE SOLDERING SIDE RECEIVING AND DISPLAY P W B MARKING ON P W B SWITCHING P W B MARKING ON P W B DIRT SENSOR GAS SENSOR P W B MARKING ON P W B ...

Page 35: ...Ð 35 Ð COMPONENT SIDE MODEL RAC 25JX4 RAC 35JX4 POWER P W B MARKING ON P W B ...

Page 36: ...Ð 36 Ð MAIN P W B MARKING ON P W B COMPONENT SIDE SOLDERING SIDE MODEL RAC 25JX4 RAC 35JX4 ...

Page 37: ...r AX 7T10 INDOOR UNIT OUTDOOR UNIT POWER RELAY POWER SWITCH Inrush current Protection 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 ...

Page 38: ...AS 25JX4 RAS 35JX4 41 43 43 43 49 45 Room temperature Silent Silent Operates at Silent regardless of the room temperature Set to Silent in modes other than when the compressor stops Air Purifier OFF OFF OFF OFF ON ON ON ON ...

Page 39: ...00 min 1 CJKMAX TY1 2600 min 1 3200 min 1 CBEMAX TY1 2450 min 1 2700 min 1 CSZMAX TY1 2300 min 1 2400 min 1 SDMAX 2300 min 1 2400 min 1 SDRPM 1800 min 1 1800 min 1 WMIN 1050 min 1 1050 min 1 CMINHI 1800 min 1 1800 min 1 CMIN 1800 min 1 1800 min 1 DMIN 1450 min 1 1450 min 1 STARTMW 60 Seconds 60 Seconds STARTMC 90 Seconds 90 Seconds STARTMD 90 Seconds 90 Seconds DWNRATEW 80 80 DWNRATEC 80 80 SHIFTW...

Page 40: ...2 2 3 442 3 5 63 7 8 9 8 6 7 5 3 442 8 2 19 8 112 1 8 442 99 8 5 1 2 1 2 1 2 112 6 7 63 7 5 3 5 5 5 812 5 8 2 5 3 1 5 812 3 AA 9 6 7 6 7 1 3 5 4 5 0 0 4 B 6 7 5 CD 3 E 6 7 5 FG 3 5 8 2 3 G 6 7 63 7 5 5 DH 3 I H ...

Page 41: ... 0 0 0 1 0 0 2 3 0 0 2 4 0 2 4 0 5 0 367 0 183 5 0 61 8 1 9 9 1sec 0 3 1 0 0 0 1 0 0 2 4 2 3 0 0 0 0 0 3 2 4 0 367 0 0 5 A B 6 C 6 2 3 0 1 D D 1 D D 0 0 E 3 2 ...

Page 42: ... 9 In ÒUltra LoÓ fan mode if indoor temperature is lower than 18 C indoor fan will stop If indoor temperature is higher than 18 C 0 33 C fan will continue in ÒUltra LoÓ mode During Hotkeep or Defrost mode fan will continue in ÒUltra LoÓ mode 10 During Hot Dashed when room temperature reaches set temperature SFTDSW compressor rpm is actual rpm x DWNRATEW Temperature Calculated difference compressor...

Page 43: ... and fresh air in operations are performed At this time the operation lamp is lit 6 ÒAutomatic Two Way Air ExchangeÓ is inhibited for 8 hours after sleep operation reservation is made 7 ÒAutomatic Two Way Air ExchangeÓ setting will be cancelled automatically after 14 days have elapsed since the setting is made Notes 1 When the sleep operation including 1 more timer operation is performed while the...

Page 44: ...eheating 15min and above Auto fresh defrosting Stop Hi or Lo Hi or Lo 15sec 10sec 1sec 13sec 30sec 1sec 3min 1min 60sec 60sec 30sec 30sec Room temperature 1hr 3 5hr 3hr 1hr 0 5hr Set to continuous operation One more timer inhibited One more timer monitoring Max 4hrs S S Lo See basic operation See basic operation Notes 1 The sleep operation starts when the sleep button is pressed 2 When the sleep b...

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Page 46: ... 0 1 0 2 3 4 0 1 5 3 4 2 3 4 0 1 1 5 3 4 6 7 7 6 7 7 8 5 5 ...

Page 47: ... 9kHz square 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 buzzerÕs sound GND VOUT C211 R212 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 S...

Page 48: ...utput from pin 15 22 of microcomputer As the microcomputerÕs outputs change as shown in Fig 4 2 the coils of the auto sweep motor is excite to turn the Micro computer pins Step width 10ms Horizontal air deflectors 1 19 20 21 22 1 2 3 4 5 6 7 8 15 16 17 18 Table 4 1 Auto sweep Motor Rotation Rotation angle per step û Time per step ms 0 0882 10 Horizontal air deflectors Ventilation Damper Fig 4 2 Mi...

Page 49: ...ing cable improper connection the thermal fuse built in the terminal block will burnt to shut off the 12 V line and stop the operation of the indoor unit Then the outdoor unit cannot be communicated with the indoor unit and a communication error occurs the outdoor LD301 will blink 9 times stop all operations Fig 6 1 Fig 5 1 Microcomputer External ROM SCL SDA 0V 0V 0V 5V 5V 5V C401 R404 R403 27 26 ...

Page 50: ...hich 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 unit will come in th...

Page 51: ...rol Ventilation fan PWM signal Microcomputer pin is a command instruction to the ventilation fan motor This signal is converted into analog voltage inside the ventilation fan motor to operate it If width of PWM signal is made wider analog voltage becomes higher and the motor rotation speed becomes faster as shown in Fig 8 2 When the motor is rotating normally the ventilation abnormality detection ...

Page 52: ...Due to the characteristics of the sensor it takes up to some several minutes before the temperature of the inner heater rises and the conditions of the gas sensing element become stable Time varies depending upon how the sensor is used When the Dirt Sensor detects the dirtiness of the air the resistance value of the sensor changes and the voltage of the Dirt Sensor Input of the microcomputer IC501...

Page 53: ...quipped with the rectification diode DC fan motor control circuit and the circuits around the micro computer which take various controls POWER P W B This P W B is equipped with the noise filter ICP power circuit interface circuit smoothing capacitor expansion valve control circuit and four way valve control circuit HARMONICS IMPROVEMENT CIRCUIT This circuit is composed of the capacitor at the bott...

Page 54: ...L2 The DB3 L1 C023 and L2 shape waveform of the input current 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 2 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 curre...

Page 55: ...b electrical noise generated during 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 wonÕt operate properly 6 SA1 and VS1 to VS3 These surge absorber and varistors absorb external power surge such as induced thunder Be sure to...

Page 56: ... circuit in the indoor unit consists of a comparator and transistor The interface signal from the outdoor unit on the DC 35V line is supplied to C821 where DC components are eliminated and is then shaped by the comparator The shaped signal is detected by diode amplified by amp and output to pin of the indoor microcomputer Fig 3 2 shows the waveforms at each component when data is transferred from ...

Page 57: ...Ð 62 Ð Fig 3 1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate with each other Fig 3 1 ...

Page 58: ... ...

Page 59: ...munications waveforms Leader 100ms 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...

Page 60: ...osis 1 Self diagnosis 0 LSB Outside temperature 0 LSB Compressor during operation Compressor command speed 0 LSB Compressor minimum rotation speed 0 LSB Compressor minimum rotation speed 1 Compressor minimum rotation speed 2 Compressor minimum rotation speed 3 Compressor minimum rotation speed 4 MSB Compressor command speed 1 Compressor command speed 2 Compressor command speed 3 Compressor command...

Page 61: ...e intelligent power module and its peripheral circuit The three transistors on the positive e side are called the upper arm and the three transistors on the negative d side the lower arm Fig 4 1 Intelligent power module circuit U is ON V is ON IP limitter ...

Page 62: ... Fig 4 3 shows voltage waveform at each point shown in Figs 4 1 and 4 4 First half of upper arm is chopper second half is ON and first half of lower arm is chopper second half is ON Return diode Point A Fig 4 4 When power is supplied U UÐ because of that U is chopped current flows as shown below 1 When U transistor is ON U transistor U coil V coil VÐ transistor DC current detection resistor Point ...

Page 63: ...at point B only when U transistor and VÐ transistor is ON the current waveform at point B becomes intermittent waveform as shown in Fig 4 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 Table 4 1 Ip peak current cut LD301 Blinks 2 times Blinks 3 times Blinks 4 times LD301 LD301 Self diagnosis Se...

Page 64: ...ile the inverter is driving the IPM outputs the Fail In this step the Q501 is turned on and the input signal of the upper arm is also shut off through the D501 and D502 so that all signals to the IGBT are shut off This signal is also distributed to two time signal into stand by state 3 minutes after this state the micro computer outputs the drive signal and restarts the operation signal immediatel...

Page 65: ...driver circuit and as well as DC 35V are produced by switching power circuit Switching power circuit performs voltage conversion effectively by switching transistor IC1 to convert DC 330V voltage to high frequency of about 20kHz to 200kHz AC220 230V C008 C013 C015 C007 C012 C014 R43 R44 ZD02 5 Power Circuit for P W B Microcomputer Fig 5 1 ...

Page 66: ...Check the removed loads If any error is found in this step the power circuit has any failure Replace the power P W B A short circuited load may cause an output error not only in the load but also in the others Be sure to check all outputs of the loads Be sure to wait 15 minutes or more in order to discharge all the remaining voltage in the circuit to connect disconnect the wiring other wise the co...

Page 67: ...ir 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 Since the compressor reliability is related with its curve All of OVL operation values were programmed into E...

Page 68: ...flowing to Detection resistor R245 and C217 average the voltage This compares this input with the set value and if the input exceeds the set value it enters overload control status the set value the microcomputer decreases the rotation speed of the compressor and reduces the load Fig 6 3 1 IS OVL voltage is then input to IC4 pin 5 and supplied to microcomputer pin 60 The microcomputer Fig 6 3 show...

Page 69: ... 0 0 10 2 0 3 4 45 45 0 0 10 6 7 8 9 7 7 0 7 3 5 3 7 2 3 7 7 2 ...

Page 70: ...rise and 12V line voltage reaches 10 9V an reset voltage input to pin 48 of microcomputer is set to Hi Reset voltage will be hold ÒHiÓ until the 12V line voltage drops to 9 90V even though the power shuts down Fig 6 7 Fig 6 8 6 2 Reset Circuit MAIN P W B Microcomputer RESET OUT RESET 56 48 C204 0V R252 1 0V 8 2 3 IC5 1 2 5V D208 R287 C215 R284 R286 C215 R285 C226 R292 R289 R288 0V 0V 0V 0V 12V 12V...

Page 71: ...frosting control 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 the operation status outdoor fan on off etc in the dehumidifying mode The following sho...

Page 72: ...n checking the Reversing valve control circuit measure the voltage between the terminals of the connector of CN2 Measurement timing is for approximately 1 second just before starting the compressor 2 times If the measurement result shown in the table below cannot be obtained failure of Reversing valve control circuit board can be suspected When the voltage is measured after connecting Reversing va...

Page 73: ...B 12 V output Use a 4 phase coil and feed power to the phases 1 and 2 then switch over the filed poles to control the opening of the valve The reference between conducting phase switch over direction and the open close direction are shown in Table 9 1 When the power is turned on approx 0 9 V is applied to the CN15 and the pins 1 to 4 and when no power is supplied 12 V is applied When the power is ...

Page 74: ...struction 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 control R107 and IC4 are used for Fan Motor over current Vsp high Faster Vsp low slower Vsp lower than 1 7V...

Page 75: ... growing inside of outdoor unit by snowing unit will be restart again after a while In case of Ò Fan Lock StopÓ even though the DC Fan Motor is rotating 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 comm...

Page 76: ...h MED to LOW while the temperature 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 s...

Page 77: ...ry before 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 functio...

Page 78: ...n adjust the temperature within a range of 3 C by pressing the ÒRoom TemperatureÓ 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 capabilit...

Page 79: ... 0 0 1 0 1 2 2 3 1 4 1 4 1 5 4 6 5 3 78 8 3 78 9 8 8 2 3 45 67 0 ...

Page 80: ...gh 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 Control P W B Voltage at point A Ground voltage Grounding 350V Point B 0V line Power inlet ...

Page 81: ...or each circuit part of the outdoor unit be sure to discharge the smoothing capacitors 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 TAB3 GRAY and TAB4 RED terminals on the main P W B as shown in the figure below in ...

Page 82: ...ｓＴｈｅｎｔｈｅｅｌｅｃｃｏｖｕｓｈａｌｌｂｅｉｎｓｅｒｔｅｄＡＢＣＤ The lower projection of electrical parts shall be sure to be hooked in cabinet When installing the parts use caution not to pinch any code between the part and cabinet Screw for fix wire of earth Screw for fix electrical parts ＣＮ７ＣＮ３ＣＮ８ＣＮ２ＩｎｄｉｃａｔｉｎｇＰＷＢ at switch ＩｎｄｉｃａｔｉｎｇＰＷＢａｔｄｉｓｐｌａｙｐａ ...

Page 83: ... 0 1 2 0 1 3 4 1 6 3 72 32 3 8 3 72 2 32 6 9 2 32 72 312 8 12 3 31 3 8 8 13 12 72 3 7 3 7 12 12 4 3 7 4 3 7 ...

Page 84: ... THE SUPPORT FUNCTION OF FAILURE DIAGNOSIS 01 2 3 4 1 2 5 1 2 6 5 6 5 6 7 4 ...

Page 85: ... 0 1 2 1034 5 6 7 8 6 9 8 6 8 6 0 1 2 534 5 8 6 9 8 6 7 0 1 2 ...

Page 86: ...at exchanger 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 IC401 abnormal 1 2 3 4 5 6 10 times 3 times 1 time 2 times 13 times 2sec 2sec 2sec 2sec 2sec 1 9 times 2sec TROUBLESHOOTING WHEN TIMER LAMP BLINKS MODEL RAS 25JX4 RAS 35JX4 MODEL RAS 25JX4 RAS 35JX...

Page 87: ...mes 2 sec 13 times 2 sec Reference the outdoor self diagnosis lamp blinks to perform the trobleshooting CAUTION 1 If the indoor unit does not work at all check the connection error or disconnection of F cable 2 If the interface circuit is failed from the time the power is turned on failure indication by lamp blinking on the indoor unit cannot be made For diagnosis of interface circuit use the self...

Page 88: ...Ð 93 Ð IPM INTELLIGENT POWER MODULE SELF DIAGNOSIS LAMPS SERVICE SWITCH LD301 LD302 LD303 MODEL RAC 25JX4 RAC 35JX4 ...

Page 89: ...s lamp status again Check outdoor electrical parts Check the refrigerating 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 ...

Page 90: ...rrect Is the compressor running Check if the connecting 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 ins...

Page 91: ... the power cable power switch and terminal board and repair any defective part Check the indoor outdoor 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 being generated between terminals C and D on the indoor unit terminal board Is the microcomputer reset...

Page 92: ... operation 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 ...

Page 93: ... ICP1 will be open again Replace the terminal 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 ...

Page 94: ... 0 1 2 0 3 4 0 4 5 5 5 3 3 3 2 6 3 4 2 7 4 0 4 8 8 8 8 ...

Page 95: ... 0 1 1 2 3 3 ...

Page 96: ...ng the test card The 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 ÒBuzzÓ 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 bu...

Page 97: ...ing System Configuration of Outdoor Unit Electrical Parts Control P W B M board Contains a rectifier circuit and inverter module their controlling microcomputer and microcomputer peripheral control circuits The board incorporates high and low current sections Power P W B P board Contains a switching power circuit noise filter power factor improvement circuit etc The switching power circuit supplie...

Page 98: ...vement capacitor Designed to improve power factor To replace the capacitor remove the power P W B and then 1 Remove two screws fastening the capacitor seat 2 Slide the capacitor seat in the direction of the arrow Sliding Direction ...

Page 99: ... that other parts may also 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 b...

Page 100: ... P W B Is the fan operating An error occurs 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 control 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 al...

Page 101: ...AB 1 TAB 2 TAB 3 TAB 4 TAB 5 TAB 6 TAB 11 TAB 12 reactor and C023 yellow green connected properly Connect properly Replace the power P W B Possible causes inclu de Power relay malfunction EDefective microcomputer terminal Yes Yes Yes No No No Is AC220 230V being output at terminals A and B on the terminal board ...

Page 102: ... being output between terminals C and D Normal DC32V Ð 39V Standby DC18V Ð 23V Is DC35V being output at both ends of R35 Connect CN 3 and CN4 Connect properly Replace the power P W B Defective SW power supply Replace the power P W B NF coils IF coils etc may be broken Check the interface circuit and replace the control P W B if needed No No No No No Yes Yes Yes Yes Yes ...

Page 103: ...forgetting to connect after servicingÓ 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 he P W B and schematic diagrams Yes Yes Yes No No No No ...

Page 104: ...lter Check the outdoor unit for defective shielding LD301 blinks 4 times Failure of switching Is the 15V power supply output normal Power P W B display Is the intelligent power module IPM normal Inverter section The intelligent power module may be defective Replace the control P W B See ÒSystem Power Module DiagnosisÓ With CN3 and CN4 disconnected is the 15V output between Ò15VÓ and Ó15 0VÓ on the...

Page 105: ...trol P 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 control P W B Make sure again that connectors are connected securely Perform final operation check Yes Yes Yes No No ...

Page 106: ... and seal refrigerant 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 ...

Page 107: ...link 4 times Be sure to push the service switch for a second again to stop the forced cool operation 1 Connect the large dia pipe side and small dia pipe side service valve using a pipe Parts to be prepared 1 Reducing union 2 8Ó 6 35 mm 3 8Ó 9 52 mm 2 Copper pipe 2 8Ó and 3 8Ó Connect the small diameter service value and the large diameter service valve using the reducing union and copper pipe as ...

Page 108: ...rcuit diagram of the device Circuit diagram of the module Terminals symbol mark of the module See next page for measuring value using multimeter Collector Emitter IPM Intelligent Power Module DIAGNOSIS SSM1001MA ...

Page 109: ...ts battery connection inside note Sometimes it may misjudge as OK because of low conductivity when power module was damaged as disconnect mode In this case please check the resistance by reversing the probe polarity and consider OK when it was low resistance Also it is OK if the resistance was as same as the other phases U V W Driver circuit internal IC 15V will not be generated when the internal ...

Page 110: ...Place your hands on both sides of the front cover and remove while pulling in the direction of the arrow 2 When the front panel is fully opened with both hands push the right arm to the inside to release it and while closing the front panel slightly put it out forward 3 Pull out the pre filters on the right and left 4 Remove the air purifying unit 2 pieces by pulling out while pushing up with both...

Page 111: ...ator towards you while lifting it up and detach the claw on the lower side of the bearing cover 3 Remove the pipe cover on the right side of the evaporator 4 Remove the fan motor holder lock screw and detach the claw of the holder by pushing the lower side of the holder upwards 5 Loosen the fan lock screw and remove the fan 6 Remove the fan motor by rotating it towards you 1 Hold the both sides of...

Page 112: ...remove the cover from the hook 5 Pull the right side of the front cover a little and pull up the left side to remove it from the hook 6 Remove each connector and earth cable from the lead wire 7 Remove four lock screws from the main P W B and pull two support hooks at the front side to remove the P W B 8 Pull three support hooks at the rear side of the Power P W B to remove the P W B Support hooks...

Page 113: ...ODEL RAS 25JX4 RAS 35JX4 44 43 12 38 1 5 3 6 4 8 10 11 9 7 28 2 37 16 17 13 30 36 35 31 33 62 61 72 64 65 66 70 67 68 69 60 49 48 47 51 46 45 50 27 63 40 29 24 26 23 25 39 57 58 18 59 20 21 71 20 22 56 55 19 42 41 15 14 34 ...

Page 114: ...IPE COVER RIGHT COVER GAS SENSOR HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWWSI425 HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS 25YH4 HWRAS 25YH4 HWRAS D10EX HWRAS 25YH4 HWRAS D10EX HWRAS 25YH4 HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS 25YH4 HWRAS D10EX HWRAS 25YH4 HWRAS 25YH4 HWRAS D10EX HWRAS D10EX HWRAS D10E...

Page 115: ...LENT STRAINER SUPPLY AIR HOOD REPELLENT STRAINER ELBOW JOINT AIR DUCT CASE AIR CLEANING FILTER HEAT INSULLATOR SHEET 220 350 2 5t HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX HWRAS D10EX 48 49 ...

Page 116: ...Ð 121 Ð OUTDOOR UNIT MODEL RAC 25JX4 RAC 35JX4 30 46 44 47 42 43 45 31 41 38 36 37 35 39 34 32 32 40 25 26 27 28 29 5 33 51 21 19 23 24 22 1 49 48 50 4 3 2 15 12 16 10 11 54 53 14 13 7 20 17 18 52 9 ...

Page 117: ...P COVER SERVICE VALVE COVER HWRAC D10EX HWRAC D10EX HWRAC 25YH4 HWRAC 25YH4 HWRAC D10EX HWRAC D10EX HWRAC D10EX HWRAC E08H HWRAC 25YH4 HWRAC E08H HWRAC D10EX HWRAC 25YH4 HWRAC D10EX HWRAC E08H HWRAC D10EX HWRAC 25YH4 HWRAC 25YH4 HWRAC 25YH4 HWRAC D10EX HWRAC 25YH4 HWRAC 25YH4 HWRAC 25YH4 HWRAC 25YH4 HWRAC 25YH4 HWRAC D10EX HWRAC 25YH4 HWRAC 25YH4 HWRAC D10EX HWRAC 25YH4 HWRAC 25YH4 HWRAC 25YH4 HWR...

Page 118: ...uring instruments for use in repairs or inspection should be accurately calibrated in advance 7 In installing the unit having been repaired be careful to prevent the occurrence of any accident such 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 grounding termina...

Page 119: ... 0 1 1 123 0 1 1 123 04 55 6 76 6 8 1 1 1 1 1 6 6 6 6 1 1 1 1 1 68 6 6 9 9 9 6 76 6 6 1 18 1 1 1 6 6 68 6 6 1 1 1 1 1 6 6 6 8 9 9 9 0 ...

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Hitachi RAC-25JX4, Service Manual

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