Hitachi RAC-10WECI Service Manual Download Page 73 | Manualshive

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TROUBLE SHOOTING

Note that the 0 V line of the
outdoor electrical parts and
the primary power circuit of
the indoor electrical parts
have voltages to ground as
illustrated in the right-hand
figure.

When conducting a check
with an oscilloscope or
something similar, do not
ground the oscilloscope.
Note that the oscilloscope
will be subjected to voltages
as illustrated in the figure
above.

Warning

Warning

Inspection instructions

Do not under any
circumstances get your
hand or metal part into
contact with the cabinet.

Danger!!!

Do not install
a grounding.

Power supply

P

ow

er circuit

Control circuit

Control circuit

Indoor fan motor

Outdoor Electrical

Indoor Electrical

1

2

3

L
N

0V line

P

o

w

er circuit

Compressor
motor

Voltage between each
part and ground

Potential at

points

Potential at

points

320V

Potential at points

1

Φ

230V 50Hz

375 F

Power supply

P

ow

er circuit

Control circuit

Control circuit

Indoor fan motor

Outdoor Electrical

Indoor Electrical

1

2

3

L
N

0V line

P

o

w

er circuit

Compressor

motor

1

Φ

230V 50Hz

500 F

3

0V line

MODEL

RAC-18/25/35/50WEC
RAC-10/14/20WECI

RAC-50WEC
RAC-20WECI

RAC-18/25/35WEC
RAC-10/14WECI

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Summary of Contents for RAC-10WECI

Page 1: ...RCE TOTAL INPUT W TOTAL AMPERES A CAPACITY COOLING HEATING TOTAL INPUT W TOTAL AMPERES A CAPACITY 1 090 250 1 460 DIMENSIONS mm 1 560 500 2 100 3 19 3 05 2 00 0 90 2 50 6 820 3 070 8 530 620 250 970 2 50 0 90 3 20 3 62 3 46 7 5 24 5 7 5 24 5 7 5 27 5 40 8 530 3 070 10 920 880 250 1 250 NET WEIGHT Kg TYPE DC INVERTER 1 PHASE 50Hz 220 230V 1 PHASE 50Hz 220 230V 1 PHASE 50Hz 220 230V 1 PHASE 50Hz 220...

Page 2: ... DANGER ...

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: ...ircuits 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 ...

Page 5: ...nd 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 th...

Page 6: ...G4A 1A NO NO YES YES 450NR ERZVA431 YES YES IC NO WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE UNIT PIPES MAX 20m REFRIGERANT CHARGING VOLUME Refrigerant 410A 950g NO NO NO NO NO 3 15A NO YES NO YES 450NR NO YES IC YES NO ASG133CDNB7AT 1250g ASD084SFNA7JK1 MIN 3m 30W DC325V 4 W DC120 380V 15A 2A 3A 3 15A R 25A 2A 3A 3 15A YES INTERNAL 720g 5 RAK 18PEC RAK 25PEC RAK 35PEC RAK 50PEC RAK 25PECC...

Page 7: ...ated 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 Be sure to completely seal any gap with putty 2 300 mm or more The clearances of the unit from top left right and front are specified in figure bel...

Page 8: ... 10m s The connecting pipe no matter big or small should 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 above 100mm above 300mm above 50mm give clearance as wide as possible above 20...

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Page 12: ...own and also set to the desired angle using the AUTO SWING button If the AUTO SWING button is pressed once the horizontal air deflector swings up and down If the button is pressed again the deflector stops in its current position Several seconde about 6 seconds may be required before the deflector starts to move The adjusting range of the horizontal air deflector is shown on the right When the ope...

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Page 16: ...UWK O L Q H K DV E HHQ FR Q Q HFWHG FR UUHFWO K HFN WR VHH L I WK H P R X Q WL Q J IUDP H K DV UX VWHG H FHVVL YHO R U L I WK H R X WG R R U X Q L W K DV WL O WHG R U E HFR P H X Q VWDEO H 1 6 1 2 5 6 5 9 7 2 2 1 3 2 1 7 6 2 1 7 2 1 7 2 2 1 3 2 1 7 6 ...

Page 17: ... R Q WDFW R X U VDO HV DJ HQ W L P P HG L DWHO L I WK H IR O O R Z L Q J S K HQ R P HQ D VK R X O G R FFX U 1 R WHV ...

Page 18: ... 95 280 50 5 42 5 590 66 5 47 5 80 80 65 37 5 65 60 70 mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm MODEL RAK 18PEC RAK 25PEC RAK 35PEC RAK 50PEC INDOOR UNIT RAK 25PECC RAK 35PECC RAK 50PECC RAK 10PECI RAK 14PECI RAK 20PECI RAK 18 25 35PEC RAK 25 35PECC RAK 10 14PECI 12 7 RAK 50PEC RAK 50PECC RAK 20PECI 140 55 16 8 140 140 88 ...

Page 19: ...ng 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 18WEC RAC 25WEC RAC 35WEC OUTDOOR UNIT More than 200 Air outlet 530 720 660 500 81 5 3 7 2 60 660 More than More than Drain hole 300 34 50 20 317 8 RAC 10WECI RAC 14WECI ...

Page 20: ...on allow at least 2 sides of space around the unit ensure 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 MODEL RAC 50WEC RAC 20WECI ...

Page 21: ... ON 15 3 59 54 16 7 62 06 OFF 15 0 59 00 16 7 62 06 ON 23 3 73 94 24 7 76 46 OFF 23 0 73 40 24 7 76 46 ON 31 3 88 34 32 7 90 86 OFF 31 0 87 80 32 7 90 86 TEMPERATURE C F INDICATION 16 INDICATION 24 INDICATION 32 RAK 18PEC RAK 25PEC RAK 35PEC RAK 50PEC RAK 25PECC RAK 35PECC RAK 50PECC RAK 10PECI RAK 14PECI RAK 20PECI RAK 18 25 35 50PEC RAK 25 35 50PECC RAK 10 14 20PECI RAC 18 25 35 50WEC RAC 10 14 ...

Page 22: ...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 ASD084SFNA7JK1 ASG133CDNB7AT 75 220 350 V 4 7 0 M 2 8 8 0 M 2 4 2 M 2 0 2 M 2 M RAC 50WEC RAC 20WECI RAC 18 25 35WEC RAC 10 14WECI WHITE COMPRESSOR YELLOW RED U V W YELLOW V RED W WHITE U RAC 50WEC RAC 20WECI RAC 18 25 35WEC RAC 10 14W...

Page 23: ... WIRING DIAGRAM RA RAC 18 25 35WEC C E P 0 5 5 3 5 2 8 1 K RAC 5 W EC 0 RAK 25 35 50PECC RAK 10 14 20PECI RAC 10 14WECI RAC 20WECI ...

Page 24: ...WIRING DIAGRAM OF THE PRINTED WIRING BOARD Remote controller RAR 5 F1 L H Reset key JSW1 A B changeover Round for solder ...

Page 25: ... 5 5 027 21752 6 1 CIRCUIT DIAGRAM POWER FOR CLEANNESS MODEL RAK 18 25 35 50PEC RAK 25 35 50PECC RAK 10 14 20PECI ...

Page 26: ...MODEL RA C 18 25 35 W EC RAC 10 14WECI ...

Page 27: ...MODEL RAC 50WEC RAC 20WECI ...

Page 28: ...amp Vertical sweep motor Horizontal sweep motor Operation Timer Indoor microcomputer Stepping motor drive circuit Outdoor microcomputer Wireless remote controller Wireless receive Reset circuit Control Power circuit Room temperature thermistor Heat exchanger thermistor Oscillator clock circuit Indoor Outdoor interface circuit Indoor Outdoor interface circuit Power circuit Indoor DC fan motor Contr...

Page 29: ...㩷㫎㪿㪼㫅㩷㫋㪿㪼㫉㫄㫆㩷㫀㫊㩷㫆㪽㪽㪅㩷㪀㪦㫇㪼㫉㪸㫋㪼㫊㩷㪸㫋㩷㵰㪣㫆㵱㩷㫉㪼㪾㪸㫉㪻㫃㪼㫊㫊㩷㫆㪽㩷㫋㪿㪼㩷㫉㫆㫆㫄㩷㫋㪼㫄㫇㪼㫉㪸㫋㫌㫉㪼㪅㪩㫌㫅㫊㩷㪸㫋㩷㵰㫌㫃㫋㫉㪸㪄㪣㫆㵱㩷㫎㪿㪼㫅㩷㫋㪿㪼㫉㫄㫆㩷㫀㫊㩷㫆㪽㪽㪅㩷㪦㫇㪼㫉㪸㫋㪼㫊㩷㪸㫋㩷㵰㪪㫀㫃㪼㫅㫋㵱㩷㫉㪼㪾㪸㫉㪻㫃㪼㫊㫊㩷㫆㪽㩷㫋㪿㪼㩷㫉㫆㫆㫄㩷㫋㪼㫄㫇㪼㫉㪸㫋㫌㫉㪼㪅㪩㫌㫅㫊㩷㪸㫋㩷㵰㫌㫃㫋㫉㪸㪄㪣㫆㵱㩷㫎㪿㪼㫅㩷㫋㪿㪼㫉㫄㫆㩷㫀㫊㩷㫆㪽㪽㪅㩷㪦㫇㪼㫉㪸㫋㪼㫊㩷㪸㫋㩷㵰㪤㪼㪻㵱㩷㫉㪼㪾㪸㫉㪻㫃㪼㫊㫊㩷㫆㪽㩷㫋㪿㪼㩷㫉㫆㫆㫄㩷㫋㪼㫄㫇㪼㫉㪸㫋㫌㫉㪼㪅㪩㫌㫅㫊㩷㪸㫋㩷㵰㫌㫃㫋㫉㪸㪄㪣㫆㵱㩷㫎㪿㪼㫅㩷㫋㪿㪼㫉㫄㫆㩷㫀㫊㩷㫆㪽㪽㪅㩷㪹㫌㫋㫋㫆㫅㪹㫌㫋㫋㫆㫅㪹㫌㫋㫋㫆㫅㪹㫌㫋㫋㫆㫅㪹㫌㫋㫋㫆㫅㪹㫌㫋㫋㫆㫅㪹㫌㫋㫋㫆㫅㪧㪛㪚㪠㪥㪉㪧㪛㪚㪦㪝㪉㩹㪤㪼㪻㩹㪃㩹㪣㫆㩹㩹㪪㫀㫃㪼㫅㫋㩹㩹㪤㪼㪻㩹㪃㩹㪣㫆㩹㩹...

Page 30: ...32 00 DASUPL 33 00 35 00 35 00 31 00 DASDNL 28 00 28 00 28 00 29 00 DASUPS 28 00 28 00 28 00 28 00 DASDNS 27 00 27 00 27 00 26 00 NORUPH 45 00 45 00 45 00 45 00 NORDNH 36 00 40 00 40 00 38 00 NORUPL 36 00 37 00 37 00 37 00 NORDNL 33 00 33 00 33 00 33 66 NORUPS 33 00 33 00 33 00 33 00 NORDNS 30 00 30 00 30 00 30 00 PDCIN2 50 00 50 00 54 00 50 00 PDCOF2 45 00 45 00 48 00 48 00 DNZKON 15 00 15 00 15 ...

Page 31: ...nd Med fan mode and v change operation mode 3 During Cool Dashed operation thermo off temperature is set temperature with shift value 3 C After thermo off operation continue in Fuzzy control mode 4 Compressor minimum ON time and OFF time is 3 minutes 5 During normal cooling mode compressor maximum rpm CMAX will maintain for 60 minutes if indoor temperature is lower than CLMXTP No time constrain if...

Page 32: ...ration wil cancel the powerful operation 5 If the sleep timer is set during powerful operation the powerful operation will be canceled 6 When the powerful operation is set the fan speed will be set to HIGH and the compressor s maximum speed will be set to CMAX2 during powerful operation The compressor s lower limit speed is CKYMIN_PW 7 The fan speed increases by FNUPPW_C 8 After the powerful opera...

Page 33: ...2 The indoor fan is operated in the Lo mode During thermo OFF indoor fan will be OFF for 5 minutes and ON for 1 minute 3 When the operation is started by the themostat turning ON the start of the indoor fan is delayed 32 seconds after the start of compressor operation 4 The compressor is operated forcedly for 3 minutes after operation is started 5 The minimum ON time and OFF time of the compressor...

Page 34: ...d 6 If the differential the room temperature the temperature setting is the differential 3 ć after powerful setting the compressor s maximum speed during powerful operation will be set to SDMAX Then the differential reduce the differential 2 33 ć during powerful operation the compressor s speed will be set to SDRPM If the differential the room temperature the temperature setting is the differentia...

Page 35: ...es No time limit constrain if room temperature is 18 or less and outdoor temperature is 2 or less 6 During preheating or defrosting or auto fresh defrosting mode indoor unit operation lamp will blink at interval of 2 seconds ON and 1 second OFF 7 When heating mode starts it will enter into preheating mode if indoor heat exchanger temperature is less than YNEOF 0 33 8 When fan is set to Med or Lo o...

Page 36: ... is set Reverse cycle operation time DEFCOL The time corresponding to outdoor tempera ture is set Reversing valve defrosting 㩿ᥦᚱㅢ㔚䋩㪦㫍㪼㫉㩷㪻㪼㪽㫉㫆㫊㫋㫀㫅㪾㩷㫀㫅㪿㫀㪹㫀㫋㩷㫇㪼㫉㫀㫆㪻㪪㫋㪸㫉㫋㪆㪪㫋㫆㫇㩷㪹㫌㫋㫋㫆㫅㪝㪸㫅㩷㫊㫇㪼㪼㪻㩷㫊㪼㫋㩷㫋㫆㩷㩹㪟㫀㩹㩷㪛㪼㪽㫉㫆㫊㫋㩷㫊㫀㪾㫅㪸㫃㪧㫉㪼㪿㪼㪸㫋㫀㫅㪾㩷㫁㫌㪻㪾㫄㪼㫅㫋㪧㫉㪼㪿㪼㪸㫋㫀㫅㪾㩷㫉㪼㫃㪼㪸㫊㪼㪻㪠㫅㪻㫆㫆㫉㩷㪽㪸㫅㪟㫀㪤㪼㪻㪣㫆㪬㫃㫋㫉㪸㪄㪣㫆㪦㫌㫋㪻㫆㫆㫉㩷㪽㪸㫅㪦㫇㪼㫉㪸㫋㫀㫆㫅㩷㫃㪸㫄㫇㪩㪼㫍㪼㫉㫊㫀㫅㪾㩷㫍㪸㫃㫍㪼㩿㪿㪼㪸㫋㫀㫅㪾㩷㩹㫆㫅㩹㩷㫄㫆㪻㪼㪀㪟㫀㩷㫆㫉㩷㪣㫆㪛㪼㪺㪼㫃㪼㫉㪸㫋㫀㫆㫅㩷㫇㪼㫉㫀㫆㪻㪩㪼㫍㪼㫉㫊㪼㩷㪺㫐㪺㫃㪼㩷㫇㪼㫉...

Page 37: ...anceled 7 When the powerful operation is set the fan speed will be set to HIGH and the compressor s maximum speed will be set to WMAX2 during powerful operation The compressor s lower limit 8 After the powerful operation is ended the system automatically operates with the previous settings speed is WKYMIN_PW used before the powerful operation the powerful operation Perform Leave Home operation acc...

Page 38: ...ECO ECO button Cooling 0 66ć Dehumidifying 0 66ć Heating 0 66ć Set temperature Current restrict Compressor speed Notes Can t set POWERFUL and ECO at the same time During FAN operation can t set ECO ...

Page 39: ... MODEL RAK 18 25PEC RAK 25PECC RAK 10PECI RAC 18 25WEC RAC 10WECI 5KNGPEGT 5KNGPEGT 5KNGPEGT 5KNGPEGT ...

Page 40: ... MODEL RAK 35PEC RAK 14PECI RAC 35WEC RAC 14WECI 5KNGPEGT 5KNGPEGT 5KNGPEGT 5KNGPEGT RAK 35PECC ...

Page 41: ... MODEL RAK 50PEC RAK 20PECI RAC 50WEC RAC 20WECI １２１２１２１２ RAK 50PECC ...

Page 42: ... the indicating P W B and pull out the P W B forward Fig 3 Procedure for Disassembly and Reassembly INDOOR UNIT Be sure to hold the front panel with both hands to detach and attach it 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 Shaft Hole Screw Terminal cover Screw cover 3 Fig 1 Sc...

Page 43: ...al 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 2 Remove the screw from the upper and lower bearing covers 3 Remove the locking hook of the lower bearing cover from the Cabinet Remove two lock screws from the fan motor holder Pull up the evaporator by holding it at the l...

Page 44: ...e it Fig 11 3 Remove the front cover lock screw 4 Lower the right side of the front cover and pull it forward Then 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 Fig 1 6 Remove each connector and earth cable from the lead wire Then remove the electrical box MODEL RAC 50WE 2 C RAC 20WECI ...

Page 45: ...ely The primary 18 5 V is supplied to the drive circuit of the indoor fan motor the 12 V is supplied to each vane motor and to the drive circuits of the cleaning unit driving motor and other equipment and the 8 5 V is adjusted to a stable 5 V by the 3 terminal regulator IC IC101 IC103 and supplied to the microcomputer peripheral circuit If a failure in a part or circuit has produced an abnormal cu...

Page 46: ...put is Lo for resetting and Hi for heating Waveform of each part when switching ON the power and when shutting down is shown in the Fig 2 2 After switching ON the power 㽲 pin of IC501 supply voltage and 㽼 pin of microcomputer becomes Hi when DC5V line rises and reaches approximately 4 4V or higher Then resetting will be cancelled and microcomputer starts operating After shutting down the power 㽲 p...

Page 47: ...veform Voltage at pin 5 of microcomputer between 0 V and pin 5 FG voltage of fan motor between pins 㽵 and 㽸 of CN2 When slow 700min 1 1 7ms When fast 1200min 1 1 7ms 5V 5V When slow 700min 1 7 1ms When fast 1200min 1 15V 15V 4 2ms 1300min 1 2 1V 5 4V Fig 3 1 Fig 3 2 0 9 1 Indoor fan motor 9 96 9 9 5 5 5 5 5 5 4 3 5 9 9 5 5 5 5 5 4 4 3 3 1 9 Primary 325V Primary 18 5V Power siganl of indoor fan fro...

Page 48: ... IS OUTPUT FROM BUZZER OUTPUT PIN OF THE MICRO computer After the amplitude of this signal has been set to 12Vp p by a transistor IT IS APPLIED TO THE BUZZEr 4HE PIEZOELECTRIC ELEMENT IN THE BUZZER OSCILLATES TO GENERATE THE BUZZERgS SOUND R640 C632 The indoor fan motor and drive circuit are connected to the primary power supply They therefore have voltage to ground Guard against electric shocks 7...

Page 49: ...stor Circuit Heat exchanger temperature is noticed inside the room 1 Preheating 2 Low temperature defrosts at cooling and dehumidification operation time 3 Not working of reversing valve or detection of opening of heat exchange thermistor is controlled According to heat exchange temperature the voltage of point becomes as it is shown in Fig 9 2 Heat exchanger thermistor Microcomputer Heat exchange...

Page 50: ...10 10 10 10 10 R901 R904 R641 R907 R908 R694 R902 R695 R741 R740 R642 DSW1 DSW1 R903 R905 R906 ...

Page 51: ... demodulated at 30 kHz Typical communication waveform Signal between F cables 1 and 2 Enlarged waveform Fig 11 2 Fig 11 1 F E D G H D Signal sent by indoor microcomputer １Ｖ DIV 9 G Signal sent by outdoor microcomputer ˍ ˋ 9 9 H E Signals sent by indoor and outdoor microcomputers ˍ ˋ 9 9 F Signal between F cables and 5ms DIV 5ms DIV ˍ ˋ 9 9 The unit is receiving a signal that it sent it is not used...

Page 52: ...ounterclockwise as viewed from the shaft side 4 terminal 3 terminal 2 terminal 1 terminal 5 ms or 10 ms Fig 12 2 Each stepping motor runs as excited in 1 or 2 phases at 100 PPS or 200 PPS The excitation pattern passes the microcomputer IC601 and then the driver IC and excites the coil of each stepping motor Fig 12 1 12 Stepping motor drive circuit ...

Page 53: ...L N 300 330 Main parts C021 C022 375 420V L N 15 MODEL RAC 18 25 35WEC RAC 10 14WECI ...

Page 54: ...ntrol 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 ...

Page 55: ...C12V 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 ...

Page 56: ... 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 follow it may be something wrong with the reversing valve circuit micon 4 1 RL3 RL3 coil 11 34 4 Revers...

Page 57: ...5 5 1 10 11 12 74 74 70 70 74 75 5 1 HIC P W B 74 70 75 ...

Page 58: ...6 Electric expansion valve circuit 48 47 46 45 13 14 15 16 4 3 2 1 68 67 66 65 RED 14 12 10 7 6 1 8 6 1 6 2 ...

Page 59: ...2A Fuse DC300 330V 7 7 1 ...

Page 60: ...2A DC300 330V ...

Page 61: ...L N 300 330 L N MODEL RAC 50WEC RAC 20WECI ...

Page 62: ...300 330 C021 C023 500 450V 16V R249 33 ACT IP CUT 30 ...

Page 63: ...ntrol 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 ...

Page 64: ...DC12V 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 R418 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 1 0 4 C ...

Page 65: ... 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 follow it may be something wrong with the reversing valve circuit micon 4 1 RL3 RL3 coil 11 4 Reversing...

Page 66: ...5 5 1 74 74 70 70 74 75 5 1 HIC P W B 40 41 42 74 70 75 ...

Page 67: ...6 Electric expansion valve circuit 5 13 14 15 16 4 3 2 1 68 67 66 65 RED 14 12 10 7 6 1 8 6 1 6 2 22 23 24 2 ...

Page 68: ...2A Fuse DC300 330V 7 1 7 ...

Page 69: ...2A DC300 330V ...

Page 70: ... a slight fan speed When set to strong fan speed the product will begin with a slight fan speed operation producing a weak fan speed for 30 seconds and then switch to strong 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 outdoor unit for frost and if ...

Page 71: ...tor 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 comfortable temperature A4 The difference between the thermometer temperature setting and room temperature will change the rotation speed of the compressor This is not a sign of a b...

Page 72: ... change Q5 I tried to change the setting with the room temperature button of the remote control unit in vain Q6 A6 You cannot make this setting when the product is in air purification mode Moreover you cannot set the product to a desired setting when quick laundry or dew control is being performed with the auto or quick dehumidification button This occurs when the room temperature and humidity hav...

Page 73: ... get your hand or metal part into contact with the cabinet Danger Do not install a grounding 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 Voltage between each part and ground Potential at points Potential at points 320V Potential at points 1Φ230V 50Hz 375 F Power supply Power circui...

Page 74: ...utdoor unit be sure to discharge the smoothing capacitors Discharge Procedure LEAD WIRE MAIN P W B 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 2 and IPM terminals on the main P W B as shown in the figure below in order to discharge voltage in smoothing capacitor ...

Page 75: ... parts 1 Remove the electrical parts cover 2 Remove the connectors from the CN4 heat exchange thermistor CN15 stepping motor and CN2 fan motor 3 Remove t lock screws Removing control P W B 1 Remove the connectors from the CN3 2 Remove the P W B from the P W B support STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS CN16 FIXTURE SCREW hree ELECTRICAL COVER RAK 18 25 35 50PEC RAK 25 35 50PECC RAK 10 14 20...

Page 76: ...will 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 De...

Page 77: ...ations is in a failure The product stores 5 last stored failure modes There is a function for deleting memory Once you clear the memory and run the product 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 c...

Page 78: ...unit is blinking troubleshoot the product while referring to the table below 2 If you wish to try another operation while the lamp is blinking operate the START STOP button on the remote control unit twice The first push will reset the indoor microcomputer while the second will activate the product Self diagnosis display function indoor side display An example of 5 time blinking 2 second intermiss...

Page 79: ...SELF DIAGNOSIS LIGHTING MODE MODEL RAC 18 25 35WEC RAC 10 14WECI ...

Page 80: ...SELF DIAGNOSIS LIGHTING MODE MODEL RAC 50WEC RAC 20WECI ...

Page 81: ...rary operation SW How to stop the operation Press and hold the Temporary operation SW again Or stop the operation using the remote controller During the forced cooling operation the Timer indicator blinks twice When performing the forced cooling operation turn the power off once If you press and hold the switch for 5 sec or longer the forced cooling operation starts To stop the forced cooling oper...

Page 82: ...ours and other factors of the day so that the phenomenon may not be able to be identified at the time of a repair service visit In that case too use the self diagnosis memory function Ć2 The outdoor self diagnosis display overload lower limit cut and OH thermistor heat up can be identified only when you are using the self diagnosis lamp of the outdoor unit and the self diagnosis memory function of...

Page 83: ...ǂǂCheck 3 Is the compressor of the outdoor unit running Yes No If you responded No to Check 2 ǂǂǂCheck 4 Does the emergency operation switch work Yes No First check the failure phenomenon and status and then move on to elaborate diagnosis Initiating troubleshooting No Yes Turn off the power wait at least 5 seconds turn it back on and observe the way the horizontal vanes move for about 30 seconds ǂ...

Page 84: ...gle phase 3 wire power supply If the 3 15 A fuse has blown out eliminate the cause of the fuse blowout Otherwise there will occur another fuse blowout If the 3 15 A fuse has blown out due to an abnormally high voltage to the power supply the varistor VA001 will deteriorate and become destroyed as well On a repair service visit due to the failure phenomenon of The power will not become turned on ta...

Page 85: ...ls Instruct your users to use new alkaline batteries Does the remote control unit have a sufficient battery capacity If the liquid crystal display becomes extremely faded when a remote control signal is sent replace the batteries No Press the reset switch of the remote control unit then conduct another operation check Has the product worked Yes Instruct your users to be sure to press the reset swi...

Page 86: ...unit output usually shows a noise waveform as shown in ǂthe right hand figure In the case of slight jamming this kind of waveform ǂwill not cause practical problems However intense degrees of jamming ǂwill disable the reception of remote control signals When the fluorescent lamp is old and is flickering it may cause disorders ǂin the reception of remote control signals Actions proposed 1 Make it h...

Page 87: ...ses coming from other electrical products Turn on and off the electrical products turn off the power and turn on the power and check their effects on the reception of remote control signals For products whose operating states change check the effects of each state Actions proposed Change the location relationship between the air conditioner and the target products Use a different wall outlet for t...

Page 88: ...the self diagnosis lamp LD301 of the outdoor unit blink once or become turned off Check for failures according to the self diagnosis display Remove the connector CN4 of the room temperature thermistor and heat exchanger thermistor and measure the thermistor resistance Did the reading roughly agree with the resistance values indicated in the right hand figure Replace the room temperature and heat e...

Page 89: ...Estimated failure locations Indoor fan motor Fan motor drive circuit Diagnosis flow Initiating troubleshooting Yes Replace the indoor fan motor No Replace the indoor electrical parts Run the product by remote control and then stop it Reproduce the failure phenomenon Is the voltage between pins ĺ and ļ of the fan motor connector CN2 below 1 5 V Take measurements while the failure phenomenon is pres...

Page 90: ...ent before inserting it into the terminal board securely Detach the connector CN3 from the terminal board temperature fuse and check the temperature fuse for continuity Is the resistance almost 0 No Yes Initiating troubleshooting Replace the indoor electrical parts Replace the terminal board 6 Timer lamp blinking blinking twice 7 Timer lamp blinking blinking three times Estimated failure locations...

Page 91: ...links 9 times and the product will not run Estimated failure location 䊶 Loose connector wire break or short circuit in the room temperature thermistor heat exchanger thermistor Cautions 䊶 Starting the product by remote control will initiate failure detection Merely turning on the power will not activate the failure detection function Diagnosis flow Initiating troubleshooting Yes Yes No No Correct ...

Page 92: ...n the indoor fan motor Indoor fan motor mechanically locked Indoor fan motor Indoor fan motor drive circuit Diagnosis flow Initiating troubleshooting No No No No No No No Yes Yes Yes Remove the cause of the mechanical lock Is the indoor fan motor connector CN2 securely inserted Is it free of wire breaks Correct the connector and wiring For 2 to 3 seconds after startup by remote control did a volta...

Page 93: ...ree from errors Yes Yes Yes Yes No No No No Correct the F cable connection Is the CN27 securely inserted into the outdoor board Correct the connector Press the START STOP button on the remote control unit and start the product Are terminals 1 and 2of the terminal board of the electrical parts of the outdoor unit subjected to 㶎Take measurements within 3 minutes after remote control operation Check ...

Page 94: ...hing 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 abnorma...

Page 95: ...unication 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 the blinking frequency of...

Page 96: ...l parts in the case of an 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 c...

Page 97: ...an 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 replac...

Page 98: ... limit 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...

Page 99: ...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 Replace the outdoor electrical parts in the case of an a...

Page 100: ...rear cover Remove screws 3PC Remove screws 3PC 2 Short the JSW1 or J1 ON PCB according to diﬀerent supplier For dis nguishing them we a ached diﬀerent type label in the ba ery case as below J1 RAR 5F1 RAR 5F1 1 JSW1 Type label RAR 5F1 1 Type label RAR 5F1 ...

Page 101: ... to Heating Shift mode Screen 4 NOTE 1 There are total of 7 shift values ranging from 3 to 3 2 The displayed shift value and symbol on the remote controller display will be disappear after 10 seconds 3 The changed shift value will remain unchanged after turned off the power 4 If 0 is displayed on the remote controller display it indicates the shift value is now at the initial setting Decrease 3㷄 f...

Page 102: ...e 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 mo...

Page 103: ... 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 30...

Page 104: ...tch 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 1 4 6 35 mm 3 8 9 52 mm 2 Copper pipe 1 4 and 3 8 Connect the small diameter service valve and the large diameter service valve using the reducing union and copper pipe a...

Page 105: ...PARTS LIST AND DIAGRAM INDOOR UNIT MODEL 2 1 10 28 35 3 9 4 5 36 8 6 7 13 11 12 24 21 22 23 20 25 26 18 19 5 27 32 31 33 16 17 15 14 30 38 34 29 37 RAK 18 25 35 50PEC RAK 25 35 50PECC RAK 10 14 20PECI ...

Page 106: ...2 94 2 94 2 2 9 0 18 4 18 4 4 2 9 0 6 10 18 4 7 2 2 18 4 4 0 2 0 55 4 0 2 4 0 2 2 56 22 0 1614 614 5722146 14 106 4 614 4 6 4 4106 2 0 5 4 16 10641 55 4106 18 4 6 18 4 55 2 5 18 4 4 5 18 4 1706 0 2 6 4 4 94 5 94 5 94 252 94 5 94 5 94 5 94 5 94 5 94 5 94 5 94 5 94 5 94 5 94 2 94 2 94 2 94 5 94 42 94 5 94 5 94 5 94 2 94 5 94 5 94 5 94 5 94 5 94 5 94 5 94 5 94 252 94 5 94 252 94 5 94 5 94 2 94 5 94 5...

Page 107: ... 94 2 94 2 94 2 2 9 0 18 4 18 4 4 2 9 0 6 10 18 4 7 94 5 2 2 18 4 4 0 2 0 55 4 0 2 4 0 2 2 56 22 0 1614 614 5722146 14 106 4 614 4 6 4 4106 2 0 5 4 16 10641 55 4106 18 4 6 18 4 55 2 5 18 4 4 5 18 4 1706 0 2 6 4 4 94 2 94 2 94 2 94 5 94 5 94 5 94 5 94 5 94 5 94 42 94 5 94 5 94 5 94 5 94 2 94 5 94 5 94 5 94 5 94 5 94 5 94 5 94 5 94 5 94 252 94 5 94 252 94 5 9 2 465 01 94 2 94 5 94 5 94 252 94 5 94 5...

Page 108: ... 㧕 4 2 4 2 4 2 2 9 0 18 4 18 4 4 2 9 0 6 10 18 4 7 94 5 2 2 18 4 4 0 2 0 55 4 0 2 4 0 2 2 56 22 0 1614 614 5722146 14 106 4 614 4 6 4 4106 2 0 5 4 16 10641 55 4106 18 4 6 18 4 55 2 5 18 4 4 5 18 4 1706 0 2 6 4 4 94 5 94 5 94 5 94 5 94 2 94 5 94 5 94 5 94 5 94 5 94 5 94 5 94 5 94 5 94 252 94 5 94 252 94 5 94 5 94 5 94 5 94 5 94 5 94 42 94 2 94 2 94 2 94 5 9 2 465 01 94 5 94 5 94 5 94 252 94 5 94 5 ...

Page 109: ...1 29 35 22 32 9 5 35WEC 5 18 25WEC 33 1 20 19 17 18 23 40 42 41 35WEC 41 18 25WEC 39 18 25WEC 38 2 24 26 27 28 45 34 37 15 6 16 4 3 43 11 12 14 6 35WEC 13 35WEC 13 44 7 8 39 35WEC 18 25WEC MODEL RAC 18 25 35WEC RAC 10 14WECI 18 25WEC ...

Page 110: ... 4 6 4 0 1 4 2 94 9 6 5 0 4 74 614 75 94 9 94 94 9 2 9 0 75 5722146 2 9 18 4 176 114 6 4 5614 6 4 5614 176 114 6 2 8 18 7 6 18 4 7 4 0 2 2 6 4 0 18 4 5170 2411 18 4 55 94 5170 2411 18 4 55 5170 2411 18 4 55 94 9 5170 2411 18 4 55 5170 2411 18 4 55 1 4 8 45 0 8 8 5 18 4 4 75 94 9 94 9 94 94 9 94 94 9 94 94 94 94 9 94 94 9 94 95 94 94 94 0 94 94 94 94 94 94 9 94 94 9 94 94 94 94 9 94 94 9 94 94 9 94...

Page 111: ...34 43 44 42 21 9 6 4 19 20 8 7 22 17 18 15 14 16 13 10 11 39 12 52 5 38 32 23 24 25 28 27 26 33 31 35 37 29 48 30 40 46 47 53 54 36 41 55 49 50 51 45 56 OUTDOOR UNIT MODEL RAC 50WEC RAC 20WECI ...

Page 112: ...4156 94 0 6 4 5614 5722146 94 5 1 4 8 45 0 8 8 94 9 1 2 05 10 8 8 94 9 2 46 6 10 94 952 4 614 94 9 0 1614 5722146 94 0 1614 94 9 2412 4 0 94 0 076 2412 4 0 94 0 5 18 4 94 0 0 94 9 4106 18 4 94 9 76 94 9 5 4 4 94 9 46 2 6 94 6 4 5614 176 114 6 2 4 674 94 0 5 18 4 4 94 952 6 18 4 94 9 94 9 6 4 0 18 4 94 5 612 18 4 94 0 5 48 8 8 18 4 94 0 75 55 94 0 75 94 0 4 0 2 2 94 9 64 2 465 2 6 94 9 64 2 465 18 ...

Page 113: ...93E RAK 18PEC RAC 18WEC RAK 35PEC RAC 35WEC RAK 50PEC RAC 50WEC RAK 25PEC RAC 25WEC RAK 35PECC RAC 35WEC RAK 50PECC RAC 50WEC RAK 25PECC RAC 25WEC RAK 14PECI RAC 14WECI RAK 20PECI RAC 20WECI RAK 10PECI RAC 10WECI ...

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