Hitachi RAC-10JH1 Service Manual Download Page 98

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LD301 blinks 6 times.

The temperature at the

OH thermistor rises.

Is the thermistor circuit

normal?

Replace parts in the

thermistor circuit.

LD301 blinks 5 times.

Overload lower limit cut.

Replace the main

.B.

Check to see if the refrigerating cycle is defective.

Check the indoor unit for clogged heat exchanger or filter

Check the outdoor unit for defective shielding.

LD301 blinks 4 times.

Failure of switching.

Is the 15V power supply

output normal?

(Power P

.B. display)

Is the intelligent power

module (IPM) normal?

(Inverter section)

The intelligent power module

may be defective.

Replace the main

.B.

See “System Power

Module Diagnosis”.

With CN3 and CN4

disconnected, is the 15V

output between

“15V” and

”15-0V” on the power

.B.?

Replace the power P

.B.

LD301 blinks 3 times.

Abnormal low speed.

Yes

※

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Summary of Contents for RAC-10JH1

Page 1: ...S 10JH1 RAC 10JH1 RAS 14JH1 RAC 14JH1 RAS 10JH1 RAS 14JH1 W A kW B T U h W A kW B T U h W H D kg RAS 10JH1 RAC 10JH1 DC INVERTER WALL TYPE TYPE MODEL POWER SOURCE TOTAL INPUT TOTAL AMPERES CAPACITY TOTAL INPUT TOTAL AMPERES CAPACITY DIMENSIONS mm NET WEIGHT 790 298 210 10 COOLING HEATING INDOOR UNIT OUTDOOR UNIT 1 PHASE 50Hz 220 230V 580 155 1 160 3 11 2 97 2 50 0 90 3 10 8 530 3 070 10 580 795 11...

Page 2: ...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 terminal of the unit The insulation resistance should be 1MΩ or more as measured by a 500V DC megger 9 The initial location of installation such as window floor or the other should be che...

Page 3: ...n rejected goods 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 pl...

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: ...casion 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 1...

Page 6: ...WITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL 40W DC350V NO NO NO EU1011E7 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 10JH1 RAS 14JH1 RAC 10JH1 RAC 14JH1 25W DC35V NO NO NO NO NO NO NO YES NO NO NO NO YES IC ...

Page 7: ...le 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 PRECAUTIONS DURING SHIFTING OR MAINTENANCE OFF PROHIBITION CONNECT EARTH LINE PROHIBITION PROHIBITION PROHIBITION PROHIBITION This sign in the figure indicates prohibition Indicates the instructions that must be followed 4 Do not ...

Page 8: ...o not cover the drain port of the outdoor unit because such water may freeze in the chilly area When the outdoor unit is hung on the ceiling install the bush and drain pipe on the drain port and drain water 6 NAMES AND FUNCTIONS OF EACH PART Exhaust Pre Filter This traps dirt and dust particles in the air while the exhaust is operating Refer to page 25 Nano Titanium Disinfecting Deodorizing Dust C...

Page 9: ...eating 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 Orange This lamp lights when the timer is working INDOOR UNIT INDICATORS 8 NAMES AND FUNCTIONS OF EACH PART Signal Emitting Window Transmission Sign Point this window t...

Page 10: ...IFIER Precautions for Use Do not put the remote controller in the following places In direct sunlight In the vicinity of a heater Handle the remote controller carefully Do not drop it on the floor and protect it from water Once the outdoor unit stops it will not restart for about 3 minutes unless you turn the power switch off and on or unplug the power cord and plug it in again This is to protect ...

Page 11: ...e the device without the pre filter If dust enters the machine this may cause it to malfunction When removing and installing the pre filter please take sufficient care not to cut your hand with the fin of the heat exchanger 9 7 8 12 11 10 CAUTION Groove AIR IN PRE FILTER EXHAUST PRE FILTER NANO TITANIUM DISINFECTING Nano Titanium Disinfecting Deodorizing Dust Collecting Fresh Air In Filter include...

Page 12: ...l selection START STOP 14 HEATING OPERATION Press the FUNCTION selector so that the display indicates HEAT Set the desired FAN SPEED with the FAN SPEED button the display indicates the setting AUTO The FAN SPEED changes automatically according to the temperature of the air which blows out HI Economical as the room will become warm quickly But you may feel a chill at the beginning MED Quiet LOW Mor...

Page 13: ...setting The temperature setting and the actual room temperature may vary somewhat depending on conditions COOLING OPERATION Set the desired FAN SPEED with the FAN SPEED button the display indicates the setting AUTO The FAN SPEED is HI at first and varies to MED automatically when the preset temperature has been reached HI Economical as the room will become cool quickly MED Quiet LOW More quiet SIL...

Page 14: ... 18 TWO WAY AIR EXCHANGE OPERATION Please refer to page 32 Understanding The Operating Mechanism Press the button The device beeps when it has received the signal and the two way air exchange starts By pressing the button the display changes as on the right The OPERATION and the Two Way Air Exchange lamps on the indoor unit indicators turns on Although the ventilated air is deodorized by the Nano ...

Page 15: ...he signal and the SELF CLEAN button on the remote controller turns on The SELF CLEAN lamp on the indoor unit indicators turns on This operates for about one hour and automatically stops The OPERATION lamp on the indoor unit indicators turns on during the self clean operation and then the SELF CLEAN lamp blinks When drying the two way air exchange fan and hose operation is performed the TWO WAY AIR...

Page 16: ...ward the indoor unit and press the CANCEL button The RESERVED sign goes out with a beep and the TIMER lamp on the indoor unit indicators turns off HOW TO SET THE SLEEP TIMER By pressing the SLEEP button the desired sleep time can be selected 1 hr 2 hrs 3 hrs or 7 hrs Monitoring The Sleep 7 hrs Monitoring operation momentarily stops cooling dehumidifying after operating for three hours and then the...

Page 17: ...NCEL 1 By configuring the Fresh Air In During Sleep Mode a fresh air in operation of blowing outside air into the room is added during the Sleep Timer operation page 22 while cooling dehumidifying This cannot be configured when heating operation 24 ADJUSTING THE AIR DEFLECTORS Adjustment of the conditioned air in the upward and downward directions The horizontal air deflector is automatically set ...

Page 18: ... dirty 5 Exhaust Pre Filter Handle 26 Wash Each of the Removed Filters with Water After washing with water please allow to drip dry If the dirt is difficult to wash off please wash with luke warm water that does not exceed 40 C Do not rub too hard when washing with water Nano Titanium Disinfecting Deodorizing Dust Collecting Fresh Air In Filter should wash and dry in the shade once in every 3 mont...

Page 19: ...he filter may shrink Don t operate the unit without filter Fault may occur if you continue 28 2 CLEANING OF FRONT PANEL AND TOP GRILL Remove the front panel and the top grill and wash with clean water Wash it with a soft sponge After using neutral detergent wash thoroughly with clean water When the front panel and the top grill are not removed wipe it with a soft dry cloth Wipe the remote controll...

Page 20: ...e clean usage please dry the interior of the Two Way Air Exchange Fan and Hose If this is the first time during the year seasons that the device is being used to cooling or dehumidifying operation please conduct one of the following maintenance procedures If this is the first time during the year seasons that the device is being used to heat please conduct one of the following maintenance procedur...

Page 21: ...ion 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 the difference in temperature between the inside and outside of the room is more than about 7 C the fresh air in does not operate to prevent dew condensation on the two way air excha...

Page 22: ... The Dirt Sensor detects cigarette smoke sprays pesticides alcohol etc The Dirt Sensor may also respond to sudden temperature changes when the cooling heating operation starts and sudden changes in airflow when doors open and close The automatic two way air exchange can be configured for two weeks at one time The AUTOMATIC TWO WAY AIR EXCHANGE is configured for two weeks after it is set with the r...

Page 23: ...enly cooled by conditioned air Steam emitted from the outdoor unit Water generated during defrosting operation evaporates and steam is emitted Odors 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 as the heating operation is stopped the microcomputer checks frost accumulated in the ...

Page 24: ...less 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 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS 10JH1 RAS 14JH1 INDOOR UNIT 22 ...

Page 25: ...NIT 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 65 19 5 10 91 548 528 5 19 5 162 5 50 Air outlet Rear side Air suction Unit mm 23 ...

Page 26: ... RED WHT YEL 35V 5V 0V 0 5V FG MODEL NAME RATING APPLICABLE MODELS REVERSING VALVE COIL 1351 20 RAC 10JH1 RAC 14JH1 REACTOR L1 13 mH 0 224Ω RAC 10JH1 RAC 14JH1 REACTOR L2 25 5 mH 0 37Ω RAC 10JH1 RAC 14JH1 FILM CAPACITOR 45 μF RAC 10JH1 RAC 14JH1 RAS 10JH1 RAS 14JH1 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 RE...

Page 27: ...rigerant check the color of the refrigerating machine oil inside the compressor If the color has been changed conspicuously replace the compressor WHITE COMPRESSOR YELLOW RED FRONT SIDE OF OUTDOOR UNIT EU1011E7 MODEL ITEM COMPRESSOR TYPE POWER SOURCE OUTPUT WINDING 75 20 RESISTANCE Ω 2M 1 300 2M 1 069 U V W M M M WHITE YELLOW RED RAC 10JH1 RAC 14JH1 800W DC 220 350 V CAUTION 25 ...

Page 28: ...ON DUMPER MOTOR VENTILATION FAN MOTOR GRN YEL BLK BLK WHT WHT BRN BRN RED RED RED BLK BLK BLK GRY GRY WHT YEL BLU RED RED ＭＣＮ１１ＣＮ１ＣＮ４ＣＮ２ＭＣＮ１０３ＣＮ９３ＣＮ８ＣＮ５ＭＭ２３１９４ＣＮ７ＣＮ３ＣＮ８ＣＮ9 ＣＮ２ＡＢＤＣ 1011 １２３４５６７８９ＣＮ６ BRN BLU LINE CORD GRN YEL HEAT EXCHANGER THERMISTOR GAS SENSOR INDICATING P W B SWITCH INDICATING RECIEVER ROOM TEMPERATURE THERMISTOR CON...

Page 29: ... Ｃ０３０５１１６ＷＲ７６４１０Ｋ１０Ｋ５１１６Ｗ０３０１Ｋ５１１６Ｗ０３３ＣＣＣＣＣＣＣＣＣＣＣＣＣＲ９１１Ｒ９１２Ｒ９１４Ｒ９１５Ｒ９１６Ｒ９１７Ｒ９１８Ｒ９１９Ｒ９２１Ｒ９２２Ｒ９２３Ｒ９２４２７Ｋ３０Ｋ５５１１０Ｗ１１６Ｗ０１４０２９７５０５６０５５１８Ｗ１８Ｗ０１００１１０２４１１６Ｗ５６８Ｋ２１１６Ｗ１１６Ｗ２００７１４Ｗ５０６８１００５１１６Ｗ０４２０４３１１６Ｗ５３３Ｋ１００５１１６Ｗ０４２Ｒ９３...

Page 30: ... ２１９Ｃ０００１０００１０１Ｃ２５Ｃ２１８０１０００１ＣＣ０１２５Ｃ２２４ＣＣＣ２２２ＣＲＣ２２０Ｃ３０４Ｃ２５ＣＣＣＣ５０ＣＣ６０１５０５０ＣＣＣＣ６０５Ｃ６０３Ｃ５０１Ｃ５０ＣＣＣ５０２Ｃ５０Ｃ５０４Ｃ５０３Ｃ５０ＣＣ５０５Ｃ５０６ＭＭＭＭＭＭＣ１００ＣＲＭ００１Ｃ１１０ＭＲＲＣ０１２２５０２５０００１００１ＣＣ０１３ＣＡＣＡＣＰＰＡＣ４７０ｐ４７０ｐ４７０ｐＣ８２０１００２５ＤＲＰＲＲＣ０１...

Page 31: ...NIT 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 Outdoor interface ...

Page 32: ...1 RAS 14JH1 BASIC MODE 32 33 33 33 36 34 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 33: ... CKYMAX TY1 2050 min 1 3000 min 1 CJKMAX TY1 1800 min 1 2200 min 1 CBEMAX TY1 1600 min 1 1700 min 1 CSZMAX TY1 1600 min 1 1700 min 1 SDMAX 1600 min 1 1700 min 1 SDRPM 1400 min 1 1400 min 1 WMIN 800 min 1 800 min 1 CMINHI 1400 min 1 1400 min 1 CMIN 1400 min 1 1400 min 1 DMIN 1400 min 1 1400 min 1 STARTMW 60 Seconds 60 Seconds STARTMC 90 Seconds 90 Seconds STARTMD 90 Seconds 90 Seconds DWNRATEW 80 8...

Page 34: ...mperature has a corresponding compressor speed calculated value in Table 2 larger than CMAX 2 Cool Dashed will release when i a maximum 25 minutes is lapsed and ii room temperature is lower than set temperature 3 thermo off and iii when room temperature has achieved setting temperature 1 then maximum Cool Dashed time will be revised to 20 minutes And iv indoor fan is set to Lo and Med fan mode and...

Page 35: ...hut Horizontal Facing down Hi Med Lo Silent Sleep Lo Outdoor fan See basic operation Lo S S One more timer monitoring Max 4 hours Horizontal air deflector Compressor speed Notes 1 When the sleep button is set the maximum compressor speed is limited to CSZMAX and the indoor fan is set to Sleep Lo FCSOY 2 The indoor fan speed does not change even when the fan speed mode is changed 3 If operation mod...

Page 36: ...ssor rpm will be limited to WSZMAX 9 In Ultra Lo fan mode if indoor temperature is lower than 18 indoor fan will stop If indoor temperature is higher than 18 0 33 fan will continue in Ultra Lo mode During Hotkeep or Defrost mode fan will continue in Ultra Lo mode 10 During Hot Dashed when room temperature reaches set temperature SFTDSW compressor speed is actual speed x DWNRATEW Temperature Calcul...

Page 37: ...selected by the remote control while exhaust and fresh air in operations are performed At this time the operation lamp is lit 6 Automatic Two Way Air Exchange is inhibited for 8 hours after sleep operation reservation is made 7 Automatic Two Way Air Exchange setting will be cancelled automatically after 14 days have elapsed since the setting is made Notes 1 When the sleep operation including 1 mor...

Page 38: ...ating cancelled Preheating cancelled Preheating cancelled Preheating cancelled Preheating cancelled Preheating 15min and above Auto fresh defrosting Stop Hi or Lo Hi or Lo 15sec 10sec 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 ...

Page 39: ...rainer Strainer Strainer Strainer Strainer Reversing valve Reversing valve Single ended union Single ended union Single ended union Single ended union Charge port Charge port COMPRESSOR Service valve Service valve Service valve Service valve Silencer Electric Expansion valve Electric Expansion valve COMPRESSOR 37 ...

Page 40: ...mputer When power ON 5V voltage rises and reaches 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 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 1 2 Fig...

Page 41: ... 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 buzzer s 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 Sound ...

Page 42: ...t from pin 15 22 of microcomputer As the microcomputer s 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 Time per step ms 0 0882 10 Horizontal air deflectors Ventilation Damper Fig 4 2 Microcom...

Page 43: ...able 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 1 2 3...

Page 44: ...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 the fai...

Page 45: ...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 sign...

Page 46: ...o 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 beco...

Page 47: ...ed 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 bottom of...

Page 48: ...e 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 current fr...

Page 49: ...ctrical 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 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 conn...

Page 50: ...uit 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 the o...

Page 51: ...Fig 3 1 shows the interface circuit used for the indoor and outdoor microcomputers to communicate with each other Fig 3 1 CONTROL P W B 49 ...

Page 52: ...V DC line 0V 5V 0V 0V 35V Outdoor microcomputer Pin Pin Indoor microcomputer Pin Pin Outdoor microcomputer Pin Pin Indoor microcomputer Pin Pin Fig 3 2 Voltages Waveforms of Indoor Outdoor Microcomputers Outdoor to Indoor Communications Fig 3 3 Voltages Waveforms of Indoor Outdoor Microcomputers Indoor to Outdoor Communications 50 ...

Page 53: ...ations 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 HIC ...

Page 54: ...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 spee...

Page 55: ...ligent power module and its peripheral circuit The three transistors on the positive side are called the upper arm and the three transistors on the negative狹狷 side the lower arm Fig 4 1 Intelligent power module circuit U is ON V is ON IP limitter E E E 53 ...

Page 56: ...ig 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 U diode Point A Fig 4 4 When power is supplied U V because of that U is chopped current flows as shown below 1 When U transistor is ON U transistor U coil V coil V transistor DC current detection resistor Point B Fig 4 1...

Page 57: ...nt B only when U transistor and V transistor are 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 Self dia...

Page 58: ...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 immediately fr...

Page 59: ...er 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 57 ...

Page 60: ...ved 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 components may b...

Page 61: ...nditioner 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 EEPROM...

Page 62: ...d supplied to microcomputer pin 60 The microcomputer Fig 6 4 shows the rotation speed control When the voltage at pin 60 of the microcomputer exceeds the set value the microcomputer decreases the rotation speed of the compressor and reduces the load Fig 6 3 shows the rotation speed control When the voltage at pin 61 of the microcomputer exceeds 61 Judgment value according to rotation speed interna...

Page 63: ...ge multiplied by DC current R247 R248 and 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 10JH1 and RAC 14JH1 use software to control the start current The start current varies when supply voltage varies This control method copes with vari...

Page 64: ...d 12V line voltage reaches 10 9V an reset voltage input to pin 48 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 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 C225 R285 C226 R292 R289 R288 0V 0V 0V 0V 12V 12V line 12V...

Page 65: ...defrosting 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 s...

Page 66: ...ondition is approximately as shown in Table 8 1 when measured by multimeter Table 8 1 Power P W B MAIN P W B Reversingvalve valve CN2 C 35V 12V R701 PQ701 D701 Q701 R705 R706 2 4 D 0V 6 6 24 CN4A CN4B Micro computer V Operation condition Cooling Heating Dehumidifying General operation of cooling In normal heating operation Defrosting Sensor dry About 0 8V About 35V About 35V About 0 8V About 0 8V ...

Page 67: ...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 reset...

Page 68: ...tion 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...

Page 69: ...owing inside of outdoor 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 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 wit...

Page 70: ... 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 again to MED ...

Page 71: ...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 72: ...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 73: ...r in does not operate to prevent dew condensation on the two way air exchange fan and hose and to save energy If the difference in temperature between the inside and outside of the room is more than about 7 C the fresh air in does not operate to prevent dew condensation on the two way air exchange fan and hose while cooling operation If the difference in temperature between the inside and outside ...

Page 74: ...ver ground 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 lin...

Page 75: ...sure to discharge the smoothing capacitors Discharge Procedure 1 Turn off the power of the indoor unit or pull out the power supply plug 2 After power is turned off wait for 10 minutes or more Then remove electrical parts cover and apply soldering iron of 30 to 75 W for 15 seconds or more to TAB3 GRAY and TAB4 RED terminals on the main P W B as shown in the figure below in order to discharge volta...

Page 76: ...d to the cover 2 Remove the connectors of CN1 Thermistor CN4 Stepping motor for auto sweep CN5 Ventilation damper motor CN9 Gas sensor CN10 Indoor fan motor and CN11 Ventilation fan motor from control P W B 3 Remove the fixing screw for electric part 2 places and earth wire then remove the electric parts In case the connector cannot be removed in the step2 above remove the securing screws for elec...

Page 77: ...P1 and ICP3 blowout and Q111 and Q911 failure 2 The CN3 power suppy and CN7 temperature fuse and CN10 fan motor and CN11 ventilation fan motor are the connectors with lock mechanism Press the lock with your fingers to unlock and remove the connector 1 Use due caution for short circuit in servicing Short circuit will open the ICP immediately 2 When the ICP opens remove the cause of this phenomenon ...

Page 78: ...unit is restarted In the event of communication errors the LD301 continues to blink until communication is restored Failure modes detected on indoor and outdoor unit sides are stored in the non volatile memory of the indoor unit These modes can be read later This memory is retained even if the power is turned off Data of the failure modes detected on the outdoor unit side is written in the memory ...

Page 79: ...tioner Turn off the power before performing ordinary operation How to redisplay the diagnosed failure modes 1 Set the power switch on the main unit to OFF 2 Set the remote controller display to the stop mode 3 Set the operation mode to cooling with the Function Selector button on the remote controller 4 Set the power switch on the main unit to ON 5 Set the temperature on the remote controller to 3...

Page 80: ...er 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 10JH1 RAS 14JH1 MODEL RAS 10JH1 RAS 14JH1 Perform ...

Page 81: ... 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 di...

Page 82: ...IPM INTELLIGENT POWER MODULE SELF DIAGNOSIS LAMPS SERVICE SWITCH LD301 LD302 LD303 SELF DIAGNOSIS LIGHTING MODE MODEL RAC 10JH1 RAC 14JH1 80 ...

Page 83: ...nosis lamp status again Check outdoor electrical parts Check the refrigerating cycle Normal No Yes Check the drive circuit IPM 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 ...

Page 84: ...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 instructions Check the outdoor electrical pa...

Page 85: ...tch 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 input pin 7 Hi Is the mic...

Page 86: ...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 87: ... 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 final...

Page 88: ...switch is set to fresh air in operation inhibited or fresh air in and exhaust operation inhibited position operation of the ventilation fan motor is limited Diagnosis flow Troubleshooting start Is the connector CN11 of the ventilation fan motor inserted securely Is there wiring disconnection Yes Yes Yes No No No Does voltage of approximately 12V exist between and pin of the connector CN11 of the v...

Page 89: ...memory Assumed points of failure Incomplete insertion of the connector of dirt sensor Gas sensor board Dirt sensor Caution Self diagnosis failure detection of dirt sensor is performed at the time when automatic two way air exchange is set Diagnosis flow Troubleshooting start Is the connector CN9 of the dirt sensor board inserted securely Is there wiring disconnection Yes No Replace dirt sensor boa...

Page 90: ...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 91: ...g System Configuration of Outdoor Unit Electrical Parts Main 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 supplies pow...

Page 92: ...t 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 90 ...

Page 93: ...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 94: ... 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 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 alternate...

Page 95: ...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 include Power relay malfunction Defective microcomputer terminal Yes Yes Yes No No No Is AC220 230V being output at terminals A and B on the terminal board 93 ...

Page 96: ...eing output between terminals C and D Normal DC32V 39V Standby DC18V 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 main P W B if needed No No No No No Yes Yes Yes Yes Yes 94 ...

Page 97: ...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 95 ...

Page 98: ...er 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 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 power P W ...

Page 99: ... 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 97 ...

Page 100: ...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 101: ...ink 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 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...

Page 102: ...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 100 ...

Page 103: ...tery 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 IC has...

Page 104: ...ab of the front cover 1 place 6 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 pullin...

Page 105: ...aporator 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 side...

Page 106: ... 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 Suppo...

Page 107: ...S 14JH1 PARTS LIST AND DIAGRAM 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 20 71 22 56 55 19 42 41 15 14 34 105 ...

Page 108: ...NDICATION 21 RAS EX36V 022 1 CONNECTING CORD 3P 22 RAS H28T 024 1 CONNECTING CORD 9P 23 RAS H28T 026 2 VERTICAL DEFLECTOR 24 RAS 14JH1 910 1 DRAIN PAN 25 RAS H28T 027 1 HORIZONTAL DEFLECTOR 26 RAS N22V 029 1 DEFLECTOR SUPPORT 27 RAS 14JH1 911 1 AUTO SWEEP MOTOR 28 RAS N22V 031 1 DRAIN CAP 29 RAS 14JH1 912 1 HEAT INSULATOR PIPE 30 RAS N28V 221 1 DRAIN HOSE 31 RAS 14JH1 913 1 FRONT COVER ASSEMBLY 33...

Page 109: ... 016 1 SUPPORT POWER SWITCH 59 RAS 14JH1 930 1 COVER TEMPORARY SWITCH 60 RAS H28T 061 1 FILTER EXHAUST 61 RAS H28T 032 1 FILTER CASE SUPPLY AIR CLEANING FILTER 62 RAS H28T 042 1 FILTER SUPPLY AIR 63 RAS H28T 051 1 PIPE SUPPORT REAR 64 RAS 14JH1 931 1 AIR DUCT 20mm 65 RAS 14JH1 932 1 AIR DUCT 25mm 66 RAS H28T 049 1 AIR DUCT 67 RAS 14JH1 933 1 JOINT AIR DUCT 68 RAS H28T 054 1 REPELLENT NET 69 RAS H2...

Page 110: ...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 13 6 8 14 7 20 17 18 52 9 OUTDOOR UNIT MODEL RAC 10JH1 RAC 14JH1 108 ...

Page 111: ...0972B 975 1 FAN MOTOR 40W 1 5kg 23 RAC 14JH1 916 1 PROPELLER FAN 24 RAC N22V 015 1 NUT PROPELLER FAN 25 RAC N28V 216 1 SIDE COVER L 26 RAC N28V 217 1 HANDLE 27 RAC 14JH1 917 1 FRONT COVER 28 RAC N28V 219 1 DISCHARGE GRILL 29 RAC 14JH1 918 1 ELECTRIC PARTS PLATE 30 RAC 14JH1 919 1 ELECTRIC PARTS COVER 31 RAC 14JH1 920 1 TERMINAL PLATE 32 ATI 0972B 986 2 TERMINAL BOARD 2P 33 RAC 14JH1 921 1 HEAT SIN...

Page 112: ...Printed in Japan TSK TC NO 0772E RAS 10JH1 RAC 10JH1 RAS 14JH1 RAC 14JH1 ...

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Hitachi RAC-10JH1, Service Manual

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