Hitachi RAC-18WPD Service Manual Download Page 86

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4. Failure phenomenon: The fan motor will not stop.

Situation

I have conducted the stop operation on the product by remote control, but the indoor fan motor will not stop.

(It stopped about 10 minutes later.)

Estimated failure locations

Indoor fan motor

Fan motor drive circuit

Diagnosis flow

Initiating troubleshooting

Yes

Replace the "indoor fan motor".

Replace the "indoor electrical parts".

Run the product by remote control and then stop it.
(Reproduce the failure phenomenon.)
Is the voltage between pins

and

of the fan motor

connector (CN2) below 1.5 V? (Take measurements
while the failure phenomenon is present.)

Summary of Contents for RAC-18WPD

Page 1: ...ingle outdoor unit Multi outdoor unit Indoor unit KW B T U h KW B T U h W 750 65 792 85 H 548 600 D 288 27 5 299 47 MODEL POWER SOURCE TOTAL INPUT W TOTAL AMPERES A CAPACITY COOLING HEATING TOTAL INPUT W TOTAL AMPERES A CAPACITY DIMENSIONS mm 1 120 300 1 700 32 5 NET WEIGHT TYPE DC INVERTER 1 PHASE 50Hz 220 230V 5 10 4 88 4 20 1 70 5 00 14 330 5 800 17 060 18 430 5 800 20 470 5 99 5 73 1 317 500 2...

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: ...SSOR POWER RELAY POWER SWITCH TEMPORARY SWITCH SERVICE SWITCH TRANSFORMER VARISTOR NOISE SUPPRESSOR THERMOSTAT REMOTE CONTROL SWITCH LIQUID CRYSTAL WITHOUT REFRIGERANT BECAUSE COUPLING IS FLARE TYPE PIPES NO NO NO NO NO NO YES NO NO YES IC YES 30W DC325 V 3 15A NO TVR10471 YES RAK 15QPD RAK 18RPD RAK 25RPD RAK 35RPD RAK 42RPD RAK 50RPD REFRIGERANT CHARGING VOLUME 6 ...

Page 7: ...with the enclosed insulation pipe If the insulator is insufficient please use commercial products Be sure to completely seal any gap with putty 2300 mm or more Maximum pipe length 20m Minimum pipe length 3m Figure showing the installation of lndoor unit MODEL Plug RAK 18RPD RAK 15QPD RAK 25RPD RAK 42RPD RAK 35RPD RAK 50RPD 7 ...

Page 8: ...e position of the switch otherwise will cause damage to the Main PCB 1 0kW 1 0kW 1 0kW 1 5kW 1 5kW 1 5kW SWITCH POSITION CAPACITY SELECTION NOTE FACTORY default setting is at 1 5kW capacity This setting is applicable for RAK 15QPD only SWITCH SETTING TO SELECT 1 5kW OR 1 0kW CAPACITY 8 ...

Page 9: ...r a long time take the batteries out The batteries will last for approximately 1 year However if the remote controller display begins to fade and degradation of reception performance occurs within a year replace both batteries with new size AAA LR03 alkaline The attached batteries are provided for the initial use of the system The usable period of the batteries may be short depending on the manufa...

Page 10: ...l may be shorter This unit can be ﬁ xed on a wall using the ﬁ xture provided Before ﬁ xing it make sure the indoor unit can be controlled from the remote controller Handle the remote controller with care Dropping it or getting it wet may compromise its signal transmission capability After new batteries are inserted into the remote controller the unit will initially require approximately 10 seconds...

Page 11: ...tion will change when the room temperature varies However the mode of operation will not change when indoor unit is connected to multi type outdoor unit VARIOUS FUNCTIONS Auto Restart Control If there is a power failure operation will be automatically restarted when the power is resumed with previous operation mode and airﬂ ow direction As the operation is not stopped by remote controller If you i...

Page 12: ...peration the operation lamp blinks in a cycle of 3 seconds on and 0 5 second off The maximum time for defrosting is 20 minutes However if the indoor unit is connected to multi type outdoor unit the maximum time for defrosting is 15 minutes If the piping length used is longer than usual frost is likely to form 1 2 3 Defrosting 8 DEHUMIDIFYING OPERATION Dehumidifying Function When the room temperatu...

Page 13: ...on does not start if the temperature setting is higher than the current room temperature even though the OPERATION lamp lights The cooling function will start as soon as user set the temperature below the current room temperature 10 FAN OPERATION AUTO SWING OPERATION User can use the device simply as an air circulator VERTICAL SWING HORIZONTAL SWING START STOP 1 2 Press the MODE selector so that t...

Page 14: ...just before defrost operation when the air conditioner is running in HEATING operation After auto restart POWERFUL operation is cancelled and previous operation shall start For multi model connections POWERFUL operation may not function depending on operation conditions 12 SILENT OPERATION By pressing SILENT button during AUTO HEATING DEHUMIDIFYING COOLING or FAN operation the fan speed will chang...

Page 15: ...t temperature automatically and by limiting the maximum power consumption value 14 ECO OPERATION O By pressing the ECO button during AUTO HEATING DEHUMIDIFYING or COOLING operation the air conditioner performs the ECO operation 1 Q To start ECO operation Q To cancel ECO operation O Press ECO button during operation is displayed on the LCD A beep sound is emitted from indoor unit and the ECO lamp o...

Page 16: ...ain the unit will operate in previous mode During Leave Home operation fan speed and horizontal air deﬂ ector position cannot be changed By pressing Leave Home button implementation of Weekly Timer or Once Timer is cancelled In case of power supply shut down after autorestart all setting for number of days operation will be reset and unit shall be in continuous operation POWERFUL SILENT and ECO op...

Page 17: ...ncel Reservation Point the signal window of the remote controller towards the indoor unit and press CANCEL button and ON or OFF set time goes out with a beep and the TIMER lamp on the indoor unit turns off NOTE User can set only one of the OFF timer ON timer or ON OFF timer If WEEKLY TIMER already set by setting the ONCE TIMER ONCE TIMER operation is prioritized When ONCE TIMER operation is comple...

Page 18: ...is possible to select Mode A or Mode B For each mode up to 6 programs can be set per day In total a maximum of 42 programs can be set for a week for each mode If calendar and clock are not set the reservation setting for WEEKLY TIMER cannot be set If calendar and clock are not set correctly WEEKLY TIMER will not operate correctly Reservation for calendar and clock shall be set ﬁ rst before operati...

Page 19: ...ime and program number 6 shall have the latest time If the setting time is the same Priority will be given to the latest reservation contents CAUTION If the remote controller is left idle and SEND button is not pressed within 3 minutes after reservations have been made all current reservations will be lost WEEKLY TIMER OPERATION 22 How to select Mode A or Mode B of WEEKLY TIMER setting 1 Press WEE...

Page 20: ...lamp lights up If TIMER lamp does not light up Press SEND button again Reservation data will not change if SEND button is not pressed Step 3 Copy and cancel the reservation schedule NOTE If there is no reservation data copying data from one day to another day cannot be done 1 2 3 4 5 6 8 WEEKLY TIMER OPERATION 24 Step 3 Copy and cancel the reservation schedule How to delete WEEKLY TIMER data Delet...

Page 21: ... retrieved from indoor unit To check monthly power consumption Press INFO button Temperature will be displayed for 10 seconds Direct the remote controller towards the receiver of indoor unit within 2 meters in front of indoor unit and press INFO button Wait for 2 seconds for signal transmission Once received the current calendar and clock check whether they are correct or not by pressing CLOCK but...

Page 22: ... will remain This indicates that COOLING and DEHUMIDIFYING mode operation is locked When pressing MODE button or will be displayed Method to unlock COOLING and DEHUMIDIFYING modes including FAN operations Press ECO and SILENT buttons simultaneously for about 5 seconds when the remote controller is OFF All operation mode symbols will appear on the display for about 10 seconds After that operation m...

Page 23: ...button The deflector s will start to swing up and down is displayed on the LCD Press AUTO SWING VERTICAL button again The deflector s will stop in the current position disappeared from the LCD ƽ ƽ CAUTION When operating the unit in cooling operation with the air deflector facing down and moving automatically for a long period of time water will be condensed on the air deflector and drips down occa...

Page 24: ...24 ...

Page 25: ...25 ...

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Page 27: ... earth line has been con nected correctly Check to see if the mounting frame has rusted ex cessively or if the outdoor unit has tilted or become unstable WHEN ASKING FOR SERVICE CHECK THE FOLLOWING POINTS CONDITION CHECK THE FOLLOWING POINTS 27 ...

Page 28: ...Contact your sales agent immediately if the following phenomena should occur Notes 28 ...

Page 29: ...More than More than 50mm 50mm More than Service space 2300mm INDOOR UNIT 440mm 534mm 780mm 65mm 450mm 445mm 220mm 123mm 85mm 60mm 80mm 22mm 32 5mm 123mm 280mm 42 5mm 184mm 59mm 45mm 115mm 15mm 230 780 304 347 70 73 47 47 5 60 280 60 5 203 273 284 284 19 3 60 220 4 RK 15QPD RAK 18 25 35RPD Wide pipe 12 7 RAK 42 50RPD 29 ...

Page 30: ... R U O S R E W O P T U P T U O DC 325V W 0 3 Control circuit built in M WHT RED YEL 0 6 5V 0V V 15V BLU BLK 325 L E D O M THERMOSTAT MODEL IC OPERATION MODE T A E H L O O C 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 15QPD RAK 18...

Page 31: ...WIRING DIAGRAM RAK 15QPD RAK 18RPD RAK 25RPD RAK 35RPD RAK 42RPD RAK 50RPD 31 ...

Page 32: ...WIRING DIAGRAM OF THE PRINTED WIRING BOARD Remote controller RAR 6N1 Reset carbon SW SWB SW10 Carbon SW RAR 6N1 Only for RAR 5E2 32 ...

Page 33: ...CIRCUIT DIAGRAM MODEL RAK 15QPD 33 ...

Page 34: ...CIRCUIT DIAGRAM MODEL RAK 18 25 35 42 50RPD 34 ...

Page 35: ...microcomputer Stepping motor drive circuit Wireless remote controller Wireless receive Reset circuit Control Power circuit Room temperature thermistor Heat exchanger thermistor Oscillator clock circuit Indoor Outdoor interface circuit Indoor DC fan motor send circuit BLOCK DIAGRAM MODEL RAK 15QPD RAK 18RPD RAK 25RPD RAK 35RPD RAK 42RPD RAK 50RPD Outdoor unit 1 2 3 35 ...

Page 36: ...㪅㪀㩷㪫㪿㪼㩷㪽㪸㫅㩷㫊㫇㪼㪼㪻㩷㫀㫊㩷㪺㫆㫅㫋㫉㫆㫃㫃㪼㪻㩷㪹㫐㩷㫋㪿㪼㩷㪿㪼㪸㫋㩷㪼㫏㪺㪿㪸㫅㪾㪼㫉㩷㫋㪼㫄㫇㪼㫉㪸㫋㫌㫉㪼㪒㩷㫋㪿㪼㫆㫍㪼㫉㫃㫆㪸㪻㩷㪺㫆㫅㫋㫉㫆㫃㩷㫀㫊㩷㪼㫏㪼㪺㫌㫋㪼㪻㩷㪸㫊㩷㫀㫅㩷㫋㪿㪼㩷㪽㫆㫃㫃㫆㫎㫀㫅㪾㩷㪻㫀㪸㪾㫉㪸㫄㪑㩷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㵰㫌㫃㫋㫉㪸㪄㪣㫆㵱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...

Page 37: ... 1 900 min 1 900 min 1 900 min 1 900 min 1 900 min 1 900 min 1 53F PKOU_W_M 400 min 1 400 min 1 400 min 1 400 min 1 400 min 1 400 min 1 400 min 1 541 FZZY_GN_M 1 1 1 1 1 1 1 543 FZZYTM_M 2min 2min 2min 2min 2min 2min 2min 544 DWNRATEW_M 80 80 80 80 80 80 80 545 DWNRATEC_M 60 60 60 60 60 70 70 55C SHIFTW_M 0 00 0 00 0 00 0 00 0 00 0 00 0 00 55D SFTSZW_M 0 00 0 00 0 00 0 00 0 00 0 00 0 00 564 SHIFTC...

Page 38: ... 0 00 3 00 3 00 SHIFTC 0 00 0 00 0 00 0 00 0 00 CLMXTP 30 00 30 00 30 00 30 00 30 00 TEION 2 00 2 00 2 00 2 00 2 00 TEIOF 6 00 6 00 6 00 6 00 6 00 SFTDSW 1 00 1 00 0 66 0 66 0 66 DFTIM OTP0 43 Minutes 43 Minutes 43 Minutes 43 Minutes 43 Minutes DFTIM OTP5 43 Minutes 43 Minutes 43 Minutes 43 Minutes 43 Minutes DFTIM OTP10 43 Minutes 43 Minutes 43 Minutes 50 Minutes 50 Minutes FCAUT L 0 66 0 66 0 66...

Page 39: ... 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 i...

Page 40: ...tion 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 operati...

Page 41: ...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 a...

Page 42: ... 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 differential...

Page 43: ...rpm WMAX will maintain for 120 minutes 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 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 or Silent ...

Page 44: ...d time onwards the inhibit time is set according to the time required for defrosting Reverse cycle operation time DEFCOL DEFTIM_COL is set Reverse cycle operation time DEFCOL The time corresponding to outdoor tempera ture is set 㻢 Silent button WSZMAX CSZMAX Compresson speed Indoor fan Outdoor fan 8 WUD L L 0HG RZ RZ 6LOHQW 6 8OWUD R SILENT Notes Can t set POWERFUL and SILENT at the same time 44 ...

Page 45: ...If the sleep timer is set during powerful operation the powerful operation will be canceled 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 b...

Page 46: ... 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 FCLN_WAM_P FCLN_SDF_P CLNCMP 46 ...

Page 47: ...i Defrost signal Preheating judgment Preheating released Indoor fan Hi Med Lo Ultra Lo Outdoor fan Operation lamp Reversing valve Hi or Lo Deceleration period Reverse cycle period 20 MAX 20 MAX Reverse cycle period 3 MAX Preheating Preheating released Stop 15 or more Auto fresh defrosting Hi or Lo ...

Page 48: ...NDOOR UNIT OUTDOOR UNIT INDOOR UNIT MODEL RAK 15QPD RAK 18RPD RAK 25RPD RAK 35RPD RAK 42RPD RAK 50RPD Outdoor unit Outdoor unit 1 2 RAK 42 50RPD RAK 15QPD RAK 18 25 35RPD 1 2 RAK 42 50RPD RAK 15QPD RAK 18 25 35RPD 48 ...

Page 49: ...fter removing the screw of fixing the terminal cover hold the handle of terminal cover and remove it Indicating P W B Control P W B Support hook 1 2 Push Arm Claw 4 T T Tangential air flow fan and fan motor 1 Loosenthefanlockscrew 2 Press the fan motor cover 2 fixed pawl and remove from the right to 1 Push the end of the right side arm outward to release the tab 2 Move the left side arm outward to...

Page 50: ...tion 3 Pull fan motor out of the remove the right 6 Remove the fan and bearing from the left 5 Stepping motor 1 The FC guide frame fixed claw right side press Remove the FC guide from the rear 2 Remove the stepping motor screws and take off the stepping motor Fig 6 Fig 7 Fig 8 Fig 9 Fig 10 Fig 11 4 Remove the screws from the upper and lower 5 Remove the locking hook of the lower bearing Cabinet be...

Page 51: ...it and rectified and smoothed by DB1 and C003 to become a DC current 325 V It is then supplied to indoor fan motor drive circuit and switching power circuit The switching power circuit as controlled by IC001 drives the primary winding of the transformer T001 to produce a specified voltage at the output winding The output ter 5 minal pin of IC001 has a switching voltage But it changes in voltage pe...

Page 52: ...m 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 pin of IC501 supply voltage and 㽼 pin of microcompu...

Page 53: ...per revolution of the motor shaft By counting the pulse rate the microcomputer recognizes the motor speed thereby performing feedback control Typical circuit waveform 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 The circuit check For test Na...

Page 54: ...put from buzzer output pin 32 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 The piezoelectric element in the buzzer oscillates to generate the buzzer s 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 While...

Page 55: ...stored in IC531 data will not be erased even when power is turned off Fig 6 1 6 Initial Setting Circuit IC531 1 0 1 5 1 5 1 0 531 Fig 6 2 Initial Setting Circuit IC531 and IC532 For RAK 15QPD only When power is supplied the microcomputer reads the data in IC531 and IC532 E PROM and sets the 2 preheating activation value and the rating and maximum speed of the compressor etc to their initial values...

Page 56: ...m temperature the voltage of point becomes as it is shown in Fig 8 2 Microcomputer Room Temperature Thermistor Voltage of point V 㷄 Room temperature Room temperature input Fig 8 1 Fig 8 2 䃢 A 0V 0V 5V 2 0 1 0 10 20 30 40 3 4 5 10 R402 C403 R407 91 9 Heat Exchanger Thermistor Circuit Heat exchanger temperature is noticed inside the room 1 Preheating 2 Low temperature defrosts at cooling and dehumid...

Page 57: ...10 10 10 10 10 DSW1 57 ...

Page 58: ...modulated 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 pa...

Page 59: ...ne leftˉ Vertical vane leftˉ Vertical vane leftˉ Lateral vaneˉ Lateral vaneˉ Lateral vaneˉ Lateral vaneˉ Microcomputer Fig 12 1 9 9 1 36 35 34 33 1 9 0 0 12 Stepping motor drive circuit 61 60 59 58 Horizontal sweep motor Vertical sweep motor Each stepping motor runs as excited in 1 or 2 phases at 100 PPS or 200 PPS The excitation pattern passes the microcomputer and then the driver IC and excites ...

Page 60: ...d sensor will be in operation And a low voltage output from the infrared sensor P W B will be magnified by the amplifier comparator and be transformed the digital signal to microcomputer IC601 The infrared sensor output is Hi when the activity level is not detected On the contrary output is Lo If the connector CN21 is not inserted it will be considered as no infrared sensor and no self diagnosis i...

Page 61: ...RL1 RL1 RL2 61 ...

Page 62: ...Load side is a high voltage line please be careful from electric shock and install the Indica on Lamp as near as possible to the Relay Kit The maximum length of the wiring cable should be below 100m 62 ...

Page 63: ...th 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 there is any frost conduct defrosting and then stop operating A1 A1 The pr...

Page 64: ... 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 ad ust 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 brea...

Page 65: ... time The timer cannot be set unless it is set to the current time A1 When set to the current time setting the reading blinks for about 3 minutes Wireless remote control I set the sleep timer during operation But the indoor fan will not run it will not produce wind wind intensity will not change Q5 I tried to change the setting with the room temperature button of the remote control unit in vain Q6...

Page 66: ...l parts cover 2 Remove the connectors from the CN4 heat exchange thermistor CN9 CN15 stepping motor CN2 fan motor and CN21 Eco sensor Removing control P W B 1 Remove the connectors from the CN3 2 Remove the P W B from the P W B support CN16 STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS RAK 15QPD RAK 18RPD RAK 25RPD RAK 35RPD RAK 42RPD RAK 50RPD FIXTURE SCREW FIXTURE SCREW FIXTURE SCREW ELECTRICAL COV...

Page 67: ...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 orcibly 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 Detac...

Page 68: ...oor or outdoor communications 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 ailure modes can be checked by both the blinking of the lamp of the indoor unit and the display of the r...

Page 69: ...nit 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 intermissi...

Page 70: ...68 70 ...

Page 71: ...e only 012 00 Indoor interface circuit broken and outdoor units 1 Indoor interface circuit Outdoor interface circuit broken 1 Outdoor interface circuit 020 00 ECO sensor unit defective Short circuit ECO sensor circuit ...

Page 72: ...pped Temporary 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 Press and hold the shown in the right figure for 5 sec When performing the forced cooling operation turn the power off once If you press and hold the switch for 5 sec or longer th...

Page 73: ...37 and page 38 73 ...

Page 74: ...Please set the DIP switch No 6 to ON accordingly Refe to page r RAR 6N1 RAR 6N2 RAR 6N3 RAR 6N4 RAR 6N5 57 74 ...

Page 75: ...57 75 ...

Page 76: ...76 ...

Page 77: ... 䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭䇭 B C E F 㺢 F 䌖 B GH E H C J E 77 ...

Page 78: ... 䇭䇭 G FK 㺢 F L M C B C M C E C B H C E B M C E C B M C 78 ...

Page 79: ...e sunshine operating hours 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 diagno...

Page 80: ...Check 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 ǂǂǂ...

Page 81: ...ngle 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 t...

Page 82: ...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 83: ...it 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 har...

Page 84: ...s 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 the...

Page 85: ...e of the indoor unit blinking Yes Yes Yes No No No Check for failures according to the self diagnosis display Did 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 r...

Page 86: ...timated 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 presen...

Page 87: ...nt 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 88: ...inks 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 t...

Page 89: ... 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 voltag...

Page 90: ...om errors Yes Yes Yes Yes No No No No Correct the F cable connection Is the CN 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 the elec...

Page 91: ... 12 21 23 24 25 30 29 16 15 14 28 31 27 34 9 8 6 7 13 43 11 22 35 19 17 18 2 20 39 42 40 41 INDOOR UNIT MODEL PARTS LIST AND DIAGRAM RAK 15QPD RAK 18RPD RAK 25RPD RAK 35RPD RAK 42RPD RAK 50RPD 36 38 Accessory Part SPX CFH25 45 91 ...

Page 92: ...N BOX 18 HWRAK 18PED A15 1 LED COVER 19 HWRAK 18PED A16 1 FC GUIDE 20 HWRAK 18RPD A09 1 M COVER 21 HWRAK 18PSPA 919 1 DRAIN CAP 22 HWRAK 18RPD A10 1 DRAINAGE PIPE 23 HWRAK 18PED A18 1 STEPPING MOTOR 24 HWRAS 25YH4 A28 2 DEFLECTOR SUPPORT 25 HWRAK 18PED A19 1 HORIZONTAL AIR DEFLECTOR 26 HWRAK 18PED A20 2 AIR FILTER 27 HWRAK 18RPD A11 1 FRONT PANEL 28 HWRAK 35RPC 906 1 REMOTE CONTROL ASS Y 29 HWRAK ...

Page 93: ...RAK 15QPD RAK 18RP RAK 25RP D D RAK 35RP RAK 42RP D D RAK RPD 50 JCH WH NO 0108E 93 ...

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Hitachi RAC-18WPD, Service Manual

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