Hitachi RAC-18WPC Service Manual Download Page 29 | Manualshive

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Hitachi RAC-18WPC Service Manual Download Page 29

WARNING

Do not use a soldering iron with
transformer: Otherwise, thermal fuse
inside transformer will be blown.

DISCHARGE, PROCEDURE AND POWER SHUT OFF METHOD FOR
POWER CIRCUIT

Caution

Voltage of about 350 V is charged between the terminal of smoothing capacitors.
During continuity check for each circuit part of the outdoor unit, be sure to discharge the smoothing
capacitors.

Discharge Procedure

RAC-18/25WPC

1. Turn off the power.
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 IPM(24

) and IPM(

terminals on the main P.W.B. as shown in the figure below, in order to discharge voltage
in smoothing capacitor.

LEAD WIRE

SOLDERING IRON (30 TO 75W)

20)

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Summary of Contents for RAC-18WPC

Page 1: ...C 25WPC OUTDOOR UNIT OUTDOOR UNIT OUTDOOR UNIT RAC 18W RAC 25W KW B T U h KW B T U h W 660 60 660 60 H 530 530 D 278 35 278 35 MODEL POWER SOURCE TOTAL INPUT W TOTAL AMPERES A CAPACITY COOLING HEATING TOTAL INPUT W TOTAL AMPERES A CAPACITY DIMENSIONS mm 3 12 2 97 2 00 0 90 2 50 8 530 3 070 10 580 580 250 970 2 50 0 90 27 5 27 5 3 20 3 49 3 34 11 600 3 070 15 010 880 250 1 250 NET WEIGHT Kg TYPE DC...

Page 2: ... DANGER 2 ...

Page 3: ... 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 pla...

Page 4: ...rcuits for maintenance inspection or some others be careful not to have the test probes of the measuring instrument short circuit 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 wire Staple Fig 3 Grounding of the working table soldering iron Grounding wire Screw stop at the screwed part using a rag plate 4 ...

Page 5: ...d re start in a moment there is occasion that the cooling and heating operation does not start for 3 minutes it is not abnormal and this is the result of the operation of IC delay circuit This IC delay circuit ensures 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...

Page 6: ...TCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL NO NO NO YES INTERNAL YES G4A 1A NO NO YES YES YES IC NO WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE UNIT PIPES MAX 20m REFRIGERANT CHARGING VOLUME Refrigerant 410A RAC 18WPC ASD084SFNA7JK1 RAC 25WPC MIN 3m 47W DC120 380V 950g 15A 2A 3A 3 15A YES 450NR ERZVA431 R 6 ...

Page 7: ...all be insulated with insulation pipe and then wrapped with vinyl tape The insulator will deteriorate if it is not wrapped with tape The connection of insulated drain hose Inner diameter 16mm Please use insulated drain hose for the indoor piping commercial product The clearances of the unit from top left right and front are specified in figure below At least threeoftheabovesides must be open air M...

Page 8: ...ntilation flue 2 The connecting pipe should all the insulated with insulation pipe 3 Piping length is within 20m 4 Height d fferent of the piping between the indoor unit and outdoor unit s ould be within 10m h i MODEL RAC 18WPC RAC 25WPC More than 200 Air outlet 530 720 660 500 81 278 35 60 660 More than More than Drain hole 300 34 50 20 317 8 ...

Page 9: ...P A G N I T A R E M A N BLU BLUE YEL YELLOW BRN BROWN WHT WHITE GRY GRAY ORN ORANGE GRN GREEN RED RED BLK BLACK PNK PINK VIO VIOLET RAC 18 25WPC THERMOSTAT Room temperature Thermistor CONNECTION MODEL E C R U O S R E W O P T U P T U O V 0 8 3 0 2 1 C D W 7 4 WHT V BLK W M M M RED U RAC 18 25WP REACTOR 15 mH 250 m MAX 20 C C 9 ...

Page 10: ...en operated for a long time with the capillary tubes clogged or crushed or with too little refrigerant check the color of the refrigerating machine oil inside the compressor If the color has been changed conspicuously replace the compressor U V W M M WHITE YELLOW RED RAC ASD084SFNA7JK1 18 25WPC U V 75 2M 0 74 2M 0 88 100 240 V M RAC 18 25WPC RED W 10 ...

Page 11: ...WIRING DIAGRAM RAC 18 25WPC 11 ...

Page 12: ...MODEL RA C 18 25WPC 12 ...

Page 13: ...AX 12C872 Outdoor DC fan motor drive circuit Compressor motor Compressor drive circuit BLOCK DIAGRAM OUTDOOR UNIT Power source 1 O 230V 50Hz Outdoor microcomputer Indoor Outdoor interface circuit Power circuit Control power circuit Reset circuit Overheat thermistor Defrost thermistor Outdoor temperature thermistor Oscillator clock circuit L N MODEL RAC 18 25WPC Indoor unit 13 ...

Page 14: ...MODEL RAC 18 25WPC Indoor unit Indoor unit 14 ...

Page 15: ...screws 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 Radiation fin fixing screw P W B fixing screw Fig 1 MODEL RAC 18 25WP OUTDOOR UNIT 7 6 7 8 C 4 right side cover terminal cover valve cover Procedure for Disas...

Page 16: ...L N 300 330 Main parts L N C021 C022 375 420V R 15 AC 18 25WPC DESCRIPTION OF MAIN CIRCUIT OPERATION 16 ...

Page 17: ...trol IC ICI switching transformer 1 B 12V Power supply for electrical expansion valve 2 16V Power supply for IPM driver circuit of compressor and fan motor IGBT action 3 12V Power supply for 4 way valve relay power relay inrush current relay motor current amplification 4 5V Power supply for microcomputer peripheral circuits 17 ...

Page 18: ...2V DC5V 001 C002 C003 C004 C005 C011 C013 C014 NF1 1 2 5 8 L105 JUMPER D110 EARTH L104 JUMPER D110 EARTH L103 JUMPER D110 EARTH R120 B 12V R120 B 0V B 12V O P Expansion valve Main parts 1 2 2 3 0 5V 1 5V 1 0V 15 5 2 5V 1 0V 13 18 ...

Page 19: ...o control the relay ON OFF of the revesing valve and also control the coil of the reversing valve ON OFF The relay ON OFF has different type when in the different operation mode You can see each operation mode as fllows If the reaversing valve not connected or all the condition not the same as follow it may be something wrong with the reversing valve circuit micon 4 1 RL3 RL3 coil 11 34 4 Reversin...

Page 20: ...5 5 1 10 11 12 74 74 70 70 74 75 5 1 HIC P W B 74 70 75 20 ...

Page 21: ...6 Electric expansion valve circuit 48 47 46 45 13 14 15 16 4 3 2 1 68 67 66 65 5 14 12 10 7 6 1 8 6 1 6 2 21 ...

Page 22: ...2A Fuse DC300 330V 7 7 1 22 ...

Page 23: ...2A DC300 330V 23 ...

Page 24: ...ng the product will run for 30 seconds with a slight wind When set to strong wind the product will begin with a slight wind operation producing a weak wind for 30 seconds and then switch to strong wind A2 A3 When heating is conducted despite the high outdoor temperature the product may stop to protect its equipment The auto fresh defrost should be working When stopped the product will check its ou...

Page 25: ...ivate a preliminary operation for 1 minute At that time heating will cause the operation lamp to blink This is not a sign of a breakdown A5 The room structure air stream or other factor may cause a gap between the room temperature setting and actual room temperature If there is any difference between the setting and the room temperature adjust the temperature setting to match the living space to a...

Page 26: ...with the ON timer If the end time of the sleep timer is past the time set with the ON timer you cannot make that setting A4 Is the time not past the reserved time The set time disappears when the current time reaches the reserved time A3 The current time disappears 10 seconds later The timer set display is given priority A2 Have you set the product to the current time The timer cannot be set unles...

Page 27: ...idification and the air conditioner is in a pause The product will begin again to run within about 3 minutes The product will run with the wind speed set to a quiet state A5 The temperature setting field on the remote control unit displays ć or ć The remote control unit will give no display in response to a push of the vertical vane button The remote control unit displays nothing The product will ...

Page 28: ...ope will be subjected to voltages as illustrated in the figure above Warning Warning Do not under any circumstances get your hand or metal part into contact with the cabinet Danger Do not install a grounding Inspection instructions Power supply Power circuit Control circuit Control circuit Indoor fan motor Outdoor Electrical Indoor Electrical 1 2 3 L N 0V line Power circuit Compressor motor Voltag...

Page 29: ...uity check for each circuit part of the outdoor unit be sure to discharge the smoothing capacitors Discharge Procedure RAC 18 25WPC 1 Turn off the power 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 IPM 24 and IPM terminals on the main P W B as shown in the figure below in order to dischar...

Page 30: ...ll destroy it Be on guard When reconnecting it insert it securely all the way home All the receptacles for connecting tab terminals are with a locking mechanism Forcibly pulling any such receptacle without unlocking it will destroy it Be on guard When reconnecting it insert it securely all the way home Pinch the locking mechanism with your fingers and pull it out unlocked Other instructions 1 Deta...

Page 31: ...for several days you can read the failure modes and check them thereby detecting the less frequent failure phenomena Failure modes can be checked by both the blinking of the lamp of the indoor unit and the display of the remote control liquid crystal display The failure mode detected on the outdoor unit side is displayed by blinking the LD301 Detecting a failure will stop the outdoor unit and keep...

Page 32: ...SELF DIAGNOSIS LIGHTING MODE MODEL RAC 18 25WPC 32 ...

Page 33: ...ing capacitor Replace the outdoor electrical parts Is the power circuit normal For details see the page on the power circuit Is the 3 A fuse blown out Replace the outdoor electrical parts in the case of an abnormality in the power circuit normal Just in case put the power on one The LD301 will not go on and the power circuit is normal Replace the outdoor electrical parts in the case of an abnormal...

Page 34: ... abnormality in the communication circuit Correct the abnormal location Abnormality in equipment other than the electrical parts The LD301 blinks once Reset stopped If the indoor unit is either of the following states it will blink once Ionmist in progress 2 hours before the ON timer Turn the power back on run the product either by remote control or by using the forcible cooling switch and check t...

Page 35: ...n abnormality in the thermistor detection circuit Check the OH thermistor for wire breaks and short circuits Replace the OH thermistor Check if the OH thermistor is not loose or poorly inserted Connect the OH thermistor Normal Normal Normal Normal Normal Review the freezing cycle Refrigerant leakage or other reason is conceivable If reviewing the freezing cycle does not correct the problem replace...

Page 36: ...imit cut When cooling Is the heat exchanger of the outdoor unit clogged up Is there shelter around When heating Is the heat exchanger or filter of the indoor unit clogged up Is the freezing cycle abnormal Remove the cause of the problem Correct the abnormal location Since the compressor load was heavy the product was stopped Yes No No No Yes Yes Clear up the causation Does the service valve open N...

Page 37: ...tart again This is not a sign of a failure in the outdoor fan motor or outdoor electrical parts After restarting the product will run continuously It stops Check the outdoor fan motor For details see the page on the outdoor fan motor or the instruction plate on the lid of the electrical parts Is the outdoor fan motor abnormal Fan motor abnormal Replace the outdoor fan motor Fan motor normal Replac...

Page 38: ... Replace it 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 mod...

Page 39: ... or longer the self check diagnosis starts In this case turn the power off and start the procedure from 1 again For the initialization of the expansion valve it may take 1 min until the operation starts after the power turns on confirm that the LD301 changes to blinking 9 times communication error 2 Confirm that the LD301 blinks once from the terminal side of the outdoor unit Afterwards when about...

Page 40: ...st switch is over turn off the breaker and set the connectors back HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY 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 valve and the large diameter service valve using the reducing union and copper ...

Page 41: ...37 10 28 31 21 25 32 30 36 29 22 33 9 5 34 1 20 19 17 18 23 2 41 24 26 27 35 38 15 6 16 4 3 43 14 11 12 13 MODEL RAC 18 25WPC OUTDOOR UNIT 44 7 8 42 39 40 41 ...

Page 42: ... 38 1 TERM COVER 39 1 SOUND PROOF COVER ASS Y 40 1 SOUND PROOF COVER ASS Y 41 1 SOUND PROOF COVER ASS Y 42 1 SOUND PROOF COVER ASS Y 43 1 COIL REVERSING VALVE 44 1 SIDE COVER R HWRAC 18WPC A07 PARTS NAME HWRAC 18WEB A04 HWRAC 18WEB A07 HWRAC 18WEB A08 HWRAC 18WEB A33 HWRAC K10HCG A14 HWRAC K10HCG A12 30 HHAW PARTS NO NO Q TY U NIT HWRAC K10HCG A01 HWRAC 18WEB A02 HWRAC 18WEB A03 HWRAC 18WPC A02 HW...

Page 43: ...HITACHI HHAW NO 0 E RAC 18WPC RAC 25WPC 10 0 0 43 ...

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