Hitachi RAC-18WEF Service Manual Download Page 43 | Manualshive

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WARNING

DISCHARGE, PROCEDURE AND POWER SHUT OFF METHOD FOR

POWER CIRCUIT

Caution

Discharge Procedure

RAC-18/25/35WEF

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 (20)

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

in smoothing capacitor.

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.

RAC-50WEF

SOLDERING IRON (30 TO 75W)

LEAD WIRE

SOLDERING IRON (30 TO 75W)

LEAD WIRE

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Summary of Contents for RAC-18WEF

Page 1: ...son Controls Hitachi Air Conditioning Wuhu Co Ltd JCH WH FOR SERVICE PERSONNEL ONLY RAC 25WEF RAC 35WEF RAC 18WEF RAC 25WEF RAC 35WEF RAC 50WEF REFER TO THE FOUNDATION MANUAL CONTENTS SPECIFICATIONS 6 CONSTRUCTION AND DIMENSIONAL DIAGRAM 9 MAIN PARTS COMPONENT 11 WIRING DIAGRAM 13 BLOCK DIAGRAM 16 REFRIGERATING CYCLE DIAGRAM 17 PROCEDURE FOR DISASSEMBLY AND REASSEMBLY 20 DESCRIPTION OF MAIN CIRCUI...

Page 2: ...ug b ok c l b b c cmb uuo b ub g guud b c foum gf bkbuc dugk fm uys kbgy uo b cs j dk d o ob c cmb l g lg c g umbuy cmb d fokgcd cmb o dcs hbgfo b cmb d fokgcd bfdfcg ub jbcvbb cmb l vb u lkow g w o d w cb hd gk cmb o dc mb d fokgcd bfdfcg ub fm ok jb V h b gf hbgfo b j g hbwwb mb d dcdgk k ugcd d fcgkkgcd foum gf vd vs k cmb cmb fm ok jb umbuyb jbd w fg b b owm c foll c cmb blgd b o dc gwgd dc df...

Page 3: ...WORKING STANDARDS FOR PREVENTING BREAKAGE OF SEMICONDUCTORS 1 Scope 2 Object parts 3 Items to be observed in handling Fig 1 Conductive container Fig 2 Body earth Ω 3 ...

Page 4: ... Fig 4 Grounding a solder iron Ω Ω Fig 3 Grounding of the working table 4 ...

Page 5: ... CAUTION 5 ...

Page 6: ...SPECIFICATIONS 47W DC120 280V RAC 18 25WEF RAC 35WEF 530g 700g 930g RAC 50WEF UK DX1U 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: ...ted 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 above 100mm above 300mm above 50mm give clearance as wide as possible above 200mm above 200mm Maximum pipe length 20m Minimum pipe length 3m The cle...

Page 9: ...lue 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 OUTDOOR UNIT More than 200 Air outlet 530 720 660 500 81 27 35 60 660 More than More than Drain hole 300 34 50 20 317 8 MODEL RAC 18 25 35WEF 9 ...

Page 10: ...ure ventilation 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 200 More than More than 300 600 345 299 202 163 5 589 92 59 792 877 55 57 190 147 12 11 Drain hole Drain hole Drain hole MODEL RAC 50WEF 10 ...

Page 11: ...n Motor Specifications RAC 18 25 35 50WEF RAC 18 25 35 50WEF RAC 18 25 35 50WEF RAC 18 25 35WEF RAC 50WEF DC 120 280V 47W THERMOSTAT Room temperature Thermistor BLU BLUE YEL YELLOW BRN BROWN WHT WHITE GRY GRAY ORN ORANGE GRN GREEN RED RED BLK BLACK PNK PINK VIO VIOLET Ω ȍ ȍ 11 ...

Page 12: ...COMPRESSOR MOTOR CAUTION Compressor Motor Specifications RAC 18 25 35WEF RAC 50WEF 840W 1350W 220 350 V 220 350 V 2M 2 167 2M 1 354 GSD088SKQA6JK6 GTD130UKQA8JT6 RAC 18 25 35WEF RAC 50WEF 12 ...

Page 13: ...WIRING DIAGRAM RAC 18 25 35 50WEF MODEL WIRING DIAGRAM EE0022422A L N 3 2 1 ON DEMAND RELAY PWB USE ONE CIRCUIT OF A B DRIVE CIRCUIT FOR FAN MOTOR DRIVE CIRCUIT FOR COMPRESSOR 13 ...

Page 14: ...RAC 18 25 35WEF 14 ...

Page 15: ...RAC 50WEF 15 ...

Page 16: ...lve Outdoor Fan motor Is Ip Id Ip Id AX 18J811 V110 series Outdoor DC fan motor drive circuit Compressor motor Compressor drive circuit OUTDOOR UNIT Power source 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 Indoor unit 16 ...

Page 17: ...MODEL RAC 18 25WEF 5KNGPEGT 5KNGPEGT 5KNGPEGT 5KNGPEGT Indoor unit Indoor unit 17 ...

Page 18: ...MODEL RAC 35WEF Indoor unit Indoor unit Silencer Silencer Silencer Silencer 18 ...

Page 19: ...MODEL RAC 50WEF Indoor unit Indoor unit Silencer Silencer Silencer Silencer Silencer Silencer 19 ...

Page 20: ...ide cover Radiation fin fixing screw P W B fixing screw 6 7 8 right side cover terminal cover valve cover RAC 18 25 35WEF MODEL RAC 50WEF OUTDOOR UNIT MODEL OUTDOOR UNIT 1 Electrical parts 1 Remove the service value cover lock screws and lower the cover to remove it 2 Remove the top cover lock screw and raise the cover to remove it Fig 5 Fig 6 3 Remove the terminal plate cover cover to remove it G...

Page 21: ... line Fig 7 Fig 9 Fig 10 Fig 11 Fig 12 6 Set the electrical box upside down 7 Remove each connector and earth cable from the lead wire Then remove the electrical box take the wire out of the clamp the terminal block screw earth line line clip inductance line 2 The P W B 1 Remove the the electrical box cover detents detents 2 Remove the P W B from the support detents 21 ...

Page 22: ...L N 300 330 Main parts L N C021 C022 4 0V 5 1 RAC 18 25 35WEF 500 5 22 ...

Page 23: ...2 Power circuit Low voltage 23 ...

Page 24: ...V DC5V 001 C002 C003 C006 C007 C011 C013 C014 NF1 1 2 4 JUMPER 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 REG 1 J6 JUMPER J32 JUMPER J32 JUMPER J20 J7 1 JUMPER J20 JUMPER J26 B 12V J25 B 0V 24 ...

Page 25: ...C230V CN2 1 CN2 4 0V AC230V Usual heating Defrost HIC 35 pin 0V This model reversing valve control used to 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 ...

Page 26: ...5 5 1 78 7 5 1 HIC P W B 78 79 40 41 42 8 3 8 3 8 79 8 3 78 26 ...

Page 27: ... 9 36 38 39 37 27 ...

Page 28: ... 28 ...

Page 29: ... 6 70 90 29 ...

Page 30: ...L N 300 330 L N RAC 50WEF IGBTs 30 ...

Page 31: ...300 330 C021 C022 610 450V 31 ...

Page 32: ...2 Power circuit Low voltage Power supply for Comp driver circuit of compressor and fan motor IGBT action 32 ...

Page 33: ...C5V 001 C002 C003 C006 C007 C011 C013 C014 NF1 1 2 B 12V 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 REG 1 J9 6 JUMPER J138 JUMPER J139 JUMPER J111 JUMPER J133 J130 B 0V J138 JUMPER J138 JUMPER 33 ...

Page 34: ...C230V CN2 1 CN2 4 0V AC230V Usual heating Defrost HIC 35 pin 0V This model reversing valve control used to 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 ...

Page 35: ...5 5 1 78 78 5 1 8 3 78 79 8 3 HIC P W B 78 79 40 41 42 8 3 35 ...

Page 36: ... 9 36 38 39 37 36 ...

Page 37: ... 37 ...

Page 38: ... 6 70 90 38 ...

Page 39: ...ting the temperature higher than room temperature on the remote controller To improve the dehumidification efficiency performs quiet fan operation Therefore the air is cold and it is not a malfunction It sets to perform dehumidifying operation by setting the temperature slightly lower than remote controller setting 3 3 39 ...

Page 40: ... 40 ...

Page 41: ...Q1 Q2 Q3 A1 A3 A2 Wireless remote Control ...

Page 42: ...TROUBLE SHOOTING Warning Warning Inspection instructions 2 Φ 2 Φ MODEL RAC 18 25 35 50WEF RAC 50WEF RAC 18 25 35WEF 500 610 42 ...

Page 43: ...g iron of 30 to 75 W for 15 seconds or more to IPM 24 and IPM 20 terminals on the main P W B as shown in the figure below in order to discharge voltage in smoothing capacitor 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 RAC 50WEF SOLDERING IRON 30 TO 75W...

Page 44: ... 44 ...

Page 45: ...Troubleshooting support Ĉ ǂ ǂ ǂ ǂ ǂ ǂ Ć 45 ...

Page 46: ... START NORMAL F4 2A FUSE BLOWN CHECK OUTDOOR FAN MOTOR REACTOR CONNECTOR HALF INSERTION CHECK REACTOR CONNECTOR CONNECTING CABLE MISCONNECTION CHECK CONNECTING CABLE NO POWER SUPPLY AT TERMINAL L N CHECK POWER CABLE THERMISTOR CONNECTOR HALF INSERT INSERT CONNECTOR SECURELY COMMUNICATION CIRCUIT ABNORMAL CHANGE ODU CONTROLLER F CABLE MISS CONNECTION DISCONNECTIN CHECK THE F CABLE CONDUCT OUTDOOR F...

Page 47: ...troubleshooting of outdoor electric parts and refrigerating cycle After turning on the power perform air purification by remote control If there is not the air purifier and operating function setting to 32 by the remote control and operate in the cooling mode đ 2 47 ...

Page 48: ... LD301 blinking frequency each 0 25 second please check it carefully 48 ...

Page 49: ... 49 ...

Page 50: ... 50 ...

Page 51: ... RAC 42 50WEF only have 51 ...

Page 52: ...CHECKINGTHE REFRIGERATING CYCLE 52 ...

Page 53: ... 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 30 sec elapses 3 When the LD301 is blinks 9 times if you press the te...

Page 54: ... Do not operate for 5 minutes or more HOW O O TO OPERATE A A THE OUTDOOR UNIT INDEPENDENTLY L L 1 1 RAC 18 25 35WEF RAC 50WEF 54 ...

Page 55: ...GRAM OUTDOOR UNIT 36 10 28 21 25 31 29 35 22 32 9 5 35WEF 5 18 25WEF 33 1 20 19 17 18 23 40 41 39 18 25WEF 38 2 24 26 27 28 34 37 15 6 16 4 3 14 6 35WEF 13 43 39 35WEF 18 25WEF MODEL RAC 18 25 35WEF 11 12 7 8 44 30 42 55 ...

Page 56: ...EV COV ZU 35 1 T COVERZU 36 1 DRAIN PIPE 37 1 TERMINAL COVER 38 1 SOUND PROOF COVER ASS Y 39 HWRAC 35WEF A03 1 SOUND PROOF COVER ASS Y 40 1 SOUND PROOF COVER ASS Y 41 1 SOUND PROOF COVER ASS Y 42 1 COIL REVERSING VALVE 43 1 SIDE COVER R 44 1 FUSE 15A HWRAC 18WED A08 HWRAC 50WED A03 HWRAC 50WED A07 HWRAC 18WEB A33 HWRAC 18WED A07 HWRAC 18WED A01 HWRAC 18WED A02 HWRAC 18WED A03 HWRAC 18WEB A04 HWRAC...

Page 57: ...OUTDOOR UNIT MODEL RAC 50WEF PARTS LIST AND DIAGRAM 29 41 44 40 38 39 37 17 15 18 13 14 12 11 10 46 33 19 20 21 24 23 22 28 30 32 25 47 42 34 48 31 43 45 3 8 5 6 7 16 4 27 36 26 35 9 57 ...

Page 58: ... FAN MOTOR 23 HWRAC 50WEC A12 1 PROPELLER FAN 24 HWRAC 50NX2 A25 1 NUT PROPELLER FAN 25 HWRAC 50NX2 A26 1 SIDE COVER L 26 HWRAC 50NX2 A27 1 HANDLE 27 HWRAC 50WEF A01 1 FRONT COVER 28 HWRAC 50WEC A14 1 DISCHARGE GRILL 29 HWRAC 50WEA A14 1 EARTH PLATE 30 HWRAC E14H3 914 1 THERMISTOR OUTDOOR TEMPERATURE 31 HWRAC 50WEF A02 1 SIDE COVER R 32 HWRAC 18WSPA A24 1 TC COVER 33 HWRAC 50WEC A15 1 H SHEET 34 H...

Page 59: ...RAC 18WEF RAC 25WEF RAC 35WEF RAC 50WEF JCH WH NO 0132E 59 ...

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