Hitachi RAK-15QPC Service Manual Download Page 58

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If a cable poorly inserted in the indoor terminal board or some other failure overheats the terminal board and the

temperature fuse of the terminal board blows out, the power to the indoor communication circuit will be shut down to stop

the communications function. (In that case, the failure will be displayed by the timer lamp blinking 3 times.)

If communication fails between the indoor and outdoor units for some reason, the product will give a self-diagnosis

display either by "the timer lamp blinking 3 times" or "the timer lamp blinking 12 times" depending on the cause.

Indoor and outdoor communications are conducted by using lines 2 and 3 of F cable. Line 2 of F cable is shared with a

transmission channel that powers the outdoor unit.

Data communicated between the indoor and outdoor units are outputted from the microcomputer as serial signals and are

transmitted as demodulated by a 30 kHz carrier wave. (Both the indoor and outdoor microcomputers directly output a signal
demodulated at 30 kHz.)

< Typical communication waveform >

Signal between F cables 1 and 2

< Enlarged waveform >

Fig. 11-2

Fig. 11-1

Signal sent by indoor microcomputer

１Ｖ／

DIV

Signal sent by outdoor microcomputer

ˋ',

Signals sent by indoor and outdoor
microcomputers

ˋ',

Signal between F cables and

5ms.

／

DIV

5ms.

／

DIV

ˋ',

The unit is receiving a signal that it sent
(it is not used particularly as a signal).

Outdoor
reception
circuit

Outdoor
transmission
circuit

Outdoor
microcomputer

Inverter circuit

Indoor unit side

Outdoor unit side

Outdoor

reception
input

Outdoor

transmission
output

Indoor transmission circuit

Indoor unit reception circuit

Indoor/outdoor communication

chopper output (30kHz)

Indoor transmission output

Indoor reception input

Indoor microcomputer (IC601)

Indoor side

Microcomputer
transmission signal

Microcomputer
reception signal

Microcomputer
transmission signal

Microcomputer
reception signal

Outdoor side

Approx.
200 ms.

Check

5ms.

／

DIV

5ms.

／

DIV

C302

11. Indoor/outdoor communication circuits

3 3

1 1

2 2

30 kHz demodulated waveform

Summary of Contents for RAK-15QPC

Page 1: ...50 PC P PC PC RAK 18RPC RAK 15QPC RAK 25RPC RAR 6N1 1010 RAK 15QPC RAK 18RPC RAK 25RPC RAC 18WPC RAC 25WPC RAM 33NP2B o o o RAM 40NP2B o o o RAM 53NP2B o o o RAM 53NP3B o o o RAM 68NP3B o o o RAM 70NP4B o o o RAM 90NP5B o o o RAM 110NP6B o o o Single outdoor unit Multi outdoor unit Indoor unit RAK 18RPC RAK 15QPC RAK 25RPC HHAW NO 0099E INDOOR UNIT SPECIFICATIONS 6 HOW TO USE 9 CONSTRUCTION AND DI...

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: ...ROPROCESSOR 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 REFRIGERANT CHARGING VOLUME Refrigerant 410A NO NO NO NO NO NO YES NO NO YES IC YES 30W DC325 V 3 15A NO 450NR R YES RAK 15QPC RAK 18RPC RAK 25RPC 6 ...

Page 7: ...0 0 3 t u o b a about 450mm d n e b t o n t s u m The indoor piping should be insulated 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 RAK 25RPC Plug 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 15QPC 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: ...eflector 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 s 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 occasionally T...

Page 24: ...24 ...

Page 25: ...RAK 15QPC RAK 18RPC RAK 25RPC 25 ...

Page 26: ...RAK 35RPC RAK RPC RAK 15QPC RAK 18RPC RAK 25RPC 50 26 ...

Page 27: ...27 ...

Page 28: ...28 ...

Page 29: ...re than 50mm More than More than 50mm 50mm More than 2300mm Service space 19 3 60 220 4 PC RAK 18RPC RAK 25RPC 780 310 450 225 18 556 115 164 95 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 29 ...

Page 30: ... C 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 15QPC RAK ...

Page 31: ...WIRING DIAGRAM RAK 15QPC RAK 18RPC RAK 25RPC 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 5 5 027 21752 6 1 RAK 15QPC POWER FOR CLEANNESS 33 ...

Page 34: ...CIRCUIT DIAGRAM MODEL 5 5 027 21752 6 1 RAK 18RPC RAK 25RPC POWER FOR CLEANNESS 34 ...

Page 35: ...peration Timer Indoor 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 MODEL RAK 15QPC RAK 18RPC RAK 25RPC Outdoor unit 1 2 3 35 ...

Page 36: ...㫌㫃㫋㫉㪸㪄㪣㫆㩹㩷㪸㪾㪸㫀㫅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...

Page 37: ...n 1 460 CMIN_M 900min 1 900min 1 900min 1 900min 1 462 DMIN_M 900min 1 900min 1 900min 1 900min 1 463 PKOU_M 400min 1 400min 1 400min 1 400min 1 465 FZZY_GN_M 1 1 1 1 467 FZZYTM_M 2min 2min 2min 2min 468 DWNRATEW_M 80 80 80 80 469 DWNRATEC_M 60 60 60 60 480 SHIFTW_M 0ć 0ć 0ć 0ć 481 SFTSZW_M 0ć 0ć 0ć 0ć 488 SHIFTC_M 0ć 0ć 0ć 0ć 48C SHIFTD_M 0ć 0ć 0ć 0ć 44A CLMXTP_M 33ć 33ć 33ć 33ć 4B4 YNEOF_M 24ć 2...

Page 38: ...FTDSW DFTIM OTP0 VALUE 43 Minutes 43 Minutes 1 00 1 00 DFTIM OTP5 DFTIM OTP10 43 Minutes 43 Minutes 43 Minutes 43 Minutes 4600 min 1 4600 min 1 4600 min 1 4600 min 1 3200 min 1 3200 min 1 0 00 FCAUT L 0 66 0 66 FCAUT H 2 00 2 00 SFTDSC 0 66 0 66 OFTMPC 1 00 1 00 DASUPHH 43 00 45 00 DASDNHH 39 00 41 00 DASUPH 38 00 40 00 DASDNH 33 33 35 33 DASUPL 33 00 35 00 DASDNL 28 00 28 00 DASUPS 28 00 28 00 DA...

Page 39: ...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 indoor tem perature...

Page 40: ...he 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 operation is ended the s...

Page 41: ... 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 are 3 minutes for ...

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: ...20 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 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...

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: ...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㫀㫆㪻㪩㪼㫍㪼㫉㫊㪼㩷㪺㫐㪺㫃㪼㩷㫇㪼㫉㫀㫆㪻㪉㪇㩾㩷㪤㪘㪯㪅㪉㪇㩾㩷㪤㪘㪯㪅㪊㩾㩷㪤㪘㪯㪅㪧㫉㪼㪿㪼㪸㫋㫀㫅㪾㪧㫉㪼㪿㪼㪸㫋㫀㫅㪾㩷㫉㪼㫃㪼㪸㫊㪼㪻㪪㫋㫆㫇㪈㪌㩾㩷㫆㫉㩷㫄㫆㫉㪼㪘㫌㫋㫆㩷㪽㫉㪼㫊㪿㩷㪻㪼㪽㫉㫆㫊㫋㫀㫅㪾㪟㫀㩷㫆㫉㩷㪣㫆 RAK 15QPC RAK RPC 25 47 ...

Page 48: ...MODEL RAK 15QPC RAK 18RPC RAK 25RP Outdoor unit Outdoor unit OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT INDOOR UNIT C 48 ...

Page 49: ...and pull them forward to remove Fig 2 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 2 1 Screw Terminal cover Screw cover Fig 1 Screw 1 Push the end of the right side arm outward to release the tab 2 Mo...

Page 50: ...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 motorholder 5 Pull up the evaporator by holding it at the lowerside Insert a screwdriver through the spacebetween the evaporator and drain chute and loosen the fan lock screw to remove the fanand fan motor Lower bearing cover Cabinet 18 25PPC only have one 1 4 50...

Page 51: ... 5 V respectively 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 ...

Page 52: ...t 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 pin...

Page 53: ...eform 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 from...

Page 54: ...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 7HILE...

Page 55: ...e is 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 15QP 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 R901 R904 R641 R907 R908 R694 R902 R695 R741 R740 R642 DSW1 DSW1 R903 R905 R906 57 ...

Page 58: ...l 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 use...

Page 59: ...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 Vertical vane leftˉ Vertical vane leftˉ Vertical vane leftˉ Vertical vane leftˉ Lateral vaneˉ Lateral vaneˉ Lateral vaneˉ Lateral vaneˉ Microcomputer Fig 12 1 9 9 1 1 9 0 0 12 Stepping motor drive circuit 61 60 59 58 Horizontal swee...

Page 60: ...l 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 there is any frost conduct defrosting and then stop operating A1...

Page 61: ...r 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 bre...

Page 62: ... 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 63: ...ectrical parts 1 Remove the electrical parts cover 2 Remove the connectors from the CN4 heat exchange thermistor CN9 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 hree FIXTURE SCREW ELECTRICAL COVER RAK 15QPC RAK 18RPC RAK 25RPC 63 ...

Page 64: ...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 65: ...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 Failure modes can be checked by both the blinking of the lamp of the indoor unit and the display of the ...

Page 66: ...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 67: ...68 67 ...

Page 68: ...e only 9 mes sigle only 012 00 12 mes Indoor interface circuit broken communica on error between indoor and outdoor units 1 Indoor interface circuit Outdoor interface circuit broken 1 Outdoor interface circuit 68 ...

Page 69: ...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 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 co...

Page 70: ...37 and page 38 70 ...

Page 71: ...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 71 ...

Page 72: ...5 72 7 ...

Page 73: ...73 ...

Page 74: ... 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 74 ...

Page 75: ... 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 75 ...

Page 76: ...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 77: ...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 78: ...le 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 tak...

Page 79: ...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 80: ...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 81: ...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 82: ...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 83: ...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 84: ...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 85: ...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 86: ... 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 87: ...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 88: ...RTS LIST AND DIAGRAM INDOOR UNIT MODEL 1 10 29 37 3 9 4 5 38 39 8 6 7 13 11 12 18 25 21 22 2 20 26 27 42 19 28 34 33 35 16 17 15 14 30 41 40 32 31 36 43 RAK 15QPC RAK 18RPC RAK 25RPC 23 24 46 24 45 44 88 ...

Page 89: ... HWRAS E10H3 919 1 PIPE COVER 22 HWRAS K10HCG 912 1 DRAIN PAN ASS Y 23 HWRAS 25YHA5 A02 1 VERTICAL AIR DEFLECTOR 24 HWRAS 25YHA5 A22 1 VERTICAL AIR DEFLECTOR 25 HWRAS E10H3 921 1 DRAINAGE PIPE 26 HWRAK 18PSPA 910 1 STEPPING MOTOR 27 HWRAS 25YH4 A28 2 DEFLECTOR SUPPORT 28 HWRAS E10HA 901 1 HORIZONTAL AIR DEFLECTOR 29 HWRAS E10H3 924 1 AIR FILTER 30 HWRAK 25PPA 901 1 FRONT PANEL AS 31 HWRAK 18PPB 90...

Page 90: ...RAK 15QPC HHAW NO 0099E RAK 18RP RAK 25RP C C 90 ...

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Hitachi RAK-15QPC, Service Manual

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