Hitachi RAK-15QEF Service Manual Download Page 56 | Manualshive

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Wireless remote control

I tried to change the setting with

the "room temperature" button of

the remote control unit in vain.

Q1

A1

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.

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Summary of Contents for RAK-15QEF

Page 1: ...OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT RAK 18REF RAC 18WEF RAK 25REF RAK 25REFC RAC 25WEF RAC 35WEF RAK 35REF RAK 35REFC RAK 50REF RAK 50REFC RAC 50WEF KW B T U h KW B T U h W 780 660 60 780 660 60 780 660 60 780 792 91 H 280 530 280 530 280 530 280 600 D 215 278 55 215 278 55 215 278 55 215 299 47 MODEL POWER SOURCE TOTAL INPUT W TOTAL AMPERES A CAPACITY COOLING HEATING TO...

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: ...SPECIFICATIONS 38W DC340 V RAK 15QEF RAK 18REF RAK 25REF RAK 35REF RAK 50REF RAK 25REFC RAK 35REFC RAK 50REFC 6 ...

Page 7: ...K 25 35 50REFC above 50mm above 50mm above 50mm about 300mm about 450mm must not bend The indoor piping should be insulated with the enclosed insulation pipe If the insulator is insufficient please use commercial products 2300 mm or more Be sure to completely seal any gap with putty 7 ...

Page 8: ...ection before you can start it again Signal Transmission MODE selector Button Use this button to select the operating mode Every time you press this button the mode will change from AUTO HEAT DEHUMIDIFY COOL and FAN cyclically Page 3 ECO Button Use this button to set the ECO mode Page TIMER OFF Button Select the turn OFF time Page TIMER ON Button Select the turn ON time Page POWERFUL Button Press ...

Page 9: ...etting HEAT DEHUMIDIFY COOL or FAN Press the FAN SPEED button to select AUTO HIGH MED LOW or SILENT Press the ON OFF button Operation starts with a beep Press the button again to stop operation Set the desired room temperature with the TEMPERATURE buttons the display indicates the setting The temperature setting and the actual room temperature may vary depending on conditions 1 2 3 Set the desired...

Page 10: ...o select SILENT or LOW fan speed 1 2 5 COOLING OPERATION Use the device for cooling when the outdoor temperature is 10 to 46 C If humidity is very high over 80 indoors some dew may form on the air outlet grille of the indoor unit Press the MODE selector button so that the display indicates COOL As the settings are stored in memory in the remote controller you only have to press the ON OFF button n...

Page 11: ...op or operation Room temperature is set at 10 đ and heating operation starts Set t et et he desired room temperature with the TEMPERATURE buttons Temperature range can be set between 10 đ and 16 đ SET TEMPERATURE is displayed on the LCD Press the STOP button Change to other Operation Mode 1 2 START CANCEL 8 operation the air conditioner performs at maximum power By pressing POWERFUL button during ...

Page 12: ...utton the operation will stop lamp on the indoor unit turns off 2 1 Precautions for Use Do not open windows or doors during frost wash operation Water will condense on the air deflector and Do not open or remove the front panel during Frost Wash operation It may cause injury or malfunction Frost Wash operation does not wash away all dust and dirt If the air conditioner is continuously running Fros...

Page 13: ... The direction of the batteries should match the marks in the case 1 Do not use new and old batteries or different kinds of batteries together 2 Take out the batteries when you do not use the remote controller for 2 or 3 months CAUTION CAUTION 2 1 Adjust the airfl ow upward and downward According to operation the horizontal air defl ector is automatically set to the proper angle suitable for each ...

Page 14: ...igerant other than the one indicated on the outdoor unit R32 when installing Using other refrigerants may cause trouble or damage to the unit and personal injury moving or repairing O O O t t h h h e e r r w w i i s s e e t t t h h h i i s s m m a a y y r r r e e e s s s u u l l t t t i i n n n R32 Please read the Safety Precaution carefully before operating the unit to ensure correct usage of the...

Page 15: ... operated especially when it is very hot or very cold or when you want to reach the preset temperature quickly Stopped indoor units When an indoor unit is operated in the cooling heating or dehumidifying mode in one room the sound of refrigerant flow may be heard from a stopped indoor unit or a stopped indoor unit may become warm This is because the indoor unit returns refrigerant to the outdoor u...

Page 16: ...oughly with a soft dry cloth Wipe the water thoroughly If water remains at indicators or signal receiver of indoor unit it causes trouble CAUTION Do not splash or direct water to the body of the unit when cleaning it as this may cause short circuit Never use hot water above 40 C benzine gasoline acid thinner or a brush because they will damage the plastic surface and the coating 3 MAINTENANCE AT B...

Page 17: ...ture suitable s Have horizontal air deflectors been adjusted to their correct positions according to the operation mode selected s Are the air inlets or air outlets of indoor and outdoor units blocked s Is the fan speed LOW or SILENT When it does not operate When it does not cool well When it does not heat well If the remote controller is not transmitting a signal Remote controller display is dim ...

Page 18: ...orates and steam is emitted Caused as the smells and particles of smoke food cosmetics etc present in room air become attached the unit and blown off into the room again Defrosting is underway as the heating operation is stopped the microcomputer checks frost accumulated in the outdoor unit and instructs the unit to perform automatic defrosting if necessary Shows preheating or defrosting operation...

Page 19: ...F More than 50mm More than More than 50mm 50mm More than Service space 2300mm INDOOR UNIT RAK 18 25 35REF RAK 25 35REFC 12 7 RAK 50REF RAK 50REFC 440mm 534mm 780mm 65mm 450mm 445mm 220mm 123mm 85mm 60mm 80mm 22mm 32 5mm 123mm 280mm 42 5mm 184mm 59mm 45mm 115mm 15mm 215 780 304 347 70 73 47 47 5 60 280 5 0 6 203 273 284 284 19 ...

Page 20: ... COMPONENT FAN MOTOR THERMOSTAT Room temperature Thermistor M RAK 15QEF RAK 18 25 35 50REF RAK 18 25 35 50REFC RAK 15QEF RAK 18 25 35 50REF RAK 18 25 35 50REFC DC 340V 340V 0V 15V 0 65V RED BLK BLU WHT YEL 38W 20 ...

Page 21: ...WIRING DIAGRAM MODEL RAK 15QEF RAK 18 25 35 50REF RAK 18 25 35 50REFC 21 ...

Page 22: ...WIRING DIAGRAM OF THE PRINTED WIRING BOARD Remote controller RAR 7PE1 22 ...

Page 23: ...CIRCUIT DIAGRAM MODEL RAK 15QPE RAK 18 25 35 50REF RAK 25 35 50REFC AX 17H725 ...

Page 24: ...BLOCK DIAGRAM MODEL RAK 15QEF RAK 18 25 35 50REF RAK 25 35 50REFC Humidity Sensor AX17H725V13 Frost wash 24 ...

Page 25: ...31 33 29 MODEL RAK 15QPE RAK 18 25 35 50REF RAK 25 35 50REFC 25 ...

Page 26: ...8 00 28 00 28 00 28 00 28 00 DASDNS 27 00 27 00 27 00 27 00 26 00 NORUPH 45 00 45 00 45 00 45 00 45 00 NORDNH 36 00 36 00 40 00 40 00 38 00 NORUPL 36 00 36 00 37 00 37 00 37 00 NORDNL 33 00 33 00 33 00 33 00 33 66 NORUPS 33 00 33 00 33 00 33 00 33 00 NORDNS 30 00 30 00 30 00 30 00 30 00 PDCIN2 50 00 50 00 50 00 50 00 50 00 PDCOF2 45 00 45 00 45 00 45 00 48 00 DNZKON 15 00 15 00 15 00 15 00 15 00 D...

Page 27: ... 30min 30min 30min 30min 30min frzcln_blnce_tm_8u 8min 8min 8min 8min 8min frzcln_souf1_tm_8u 3min 3min 3min 3min 3min frzcln_souf2_tm_8u 8min 8min 8min 8min 8min frztm1_short_8u 25min 25min 25min 25min 25min frztm1_long_8u 25min 25min 25min 25min 25min clntim_def2_8u 3min 3min 3min 3min 3min clntim_wam1_frz1_8u 5min 5min 5min 5min 7min clntim_stp1_frz1_8u 3min 3min 3min 3min 3min clntim_suf1_frz1...

Page 28: ...0 80 80 80 DWNRATEC_M 60 60 60 60 70 SHIFTW_M 3 3 3 3 3 SFTSZW_M 3 3 3 3 3 SHIFTC_M 0 66 0 66 0 66 0 66 0 66 SHIFTD_M 0 0 0 0 0 CLMXTP_M 33 33 33 33 33 YNEOF_M 25 25 25 25 25 SFTDSW_M 1 1 1 1 1 TEION_M 2 2 2 2 2 TEIOF_M 6 9 9 9 6 FWSS_M 350min 1 350min 1 350min 1 350min 1 350min 1 FWSOY_M 450min 1 450min 1 450min 1 450min 1 450min 1 FWS_M 10min 1 10min 1 10min 1 10min 1 10min 1 FWKAF_M 790min 1 79...

Page 29: ...ration 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 30 C No time constrain if indoor tem perature is higher than CLMXTP 6 When fan is set to Hi compressor rpm will be limited to CSTD 7 When fan is set to Med compressor rpm will be limite...

Page 30: ...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 operation is...

Page 31: ...e 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 Lo silent Thermo OFF Thermo...

Page 32: ...led 6 If the differential the room temperature the temperature setting is the differential 3 after powerful setting the compressor s maximum speed during powerful operation will be set to SDMAX Then the differential reduce the differential 2 33 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 33: ...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 compresso...

Page 34: ... 1 The first inhibit time after operation start is set to DFTIM_FST 2 From the second 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 34 ...

Page 35: ...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 befo...

Page 36: ...Preheating judgment Preheating released Indoor fan Hi Med Lo Ultra Lo Outdoor fan Operation lamp Reversing valve cooling on mode 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 ECO button Cooling 0 66 Dehumidifying 0 66 Heating 0 66 Set temperature Current restrict Compressor sp...

Page 37: ... indoor humidity are suitable for the Frost Wash Area A B in Fig 3 4 Frost Wash auto start 4 When the Frost Wash is stopped during Frost Wash operation the unit automatically restart Frost Wash at the next operation stop 5 Before the Frost period start the outdoor temperature 16 Or before the defrosting period finish the heat exchanger temperature 0 The Heating period will not running Fan period 1...

Page 38: ...MODEL RAK 15QEF RAK 18 25 35REF RAK 25 35REFC 38 ...

Page 39: ...MODEL RAK 50REF RAK 50REFC 39 ...

Page 40: ...isassembly and Reassembly INDOOR UNIT Be sure to hold the front panel with both hands to detach and attach it 3 Fig 1 1 After 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 RAK 15QEF RAK 18 25 35 50REF RAK 25 35 50REFC 1 2 Push Arm S Claw Claw Claw Claw Claw crew Screw Screw cover Terminal cover 4 Tangenti...

Page 41: ...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 42: ...DESCRIPTION OF MAIN CIRCUIT OPERATION MODEL RAK 15QEF RAK 18 25 35 50REF RAK 25 35 50REFC 42 ...

Page 43: ...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 44: ...evolution 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 and 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 Name Test p...

Page 45: ...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 46: ... 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 15QPE only RAK 15QEF un se 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...

Page 47: ...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 48: ...10 10 10 10 10 DSW1 48 ...

Page 49: ...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 50: ...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 51: ...or 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 indicat...

Page 52: ...RL1 RL1 RL2 52 ...

Page 53: ...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 53 ...

Page 54: ...than room temperature on the remote controller To improve the dehumidification efficiency performs quiet fan operation Therefore the air is cold and it is not a malfunction It sets to perform dehumidifying operation by setting the temperature slightly lower than remote controller setting 3 3 MODEL RAK 15QEF RAK 18 25 35 50REF RAK 25 35 50REFC 54 ...

Page 55: ... 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 56: ...e button of the remote control unit in vain Q1 A1 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 ...

Page 57: ... connectors from the CN3 2 Remove the P W B from the P W B support P W B SUPPORTER P W B SUPPORTER STRUCTURE OF AN INDOOR UNIT ELECTRIC PARTS Removing electrical parts 1 Remove the electrical parts cover 2 Remove the connectors from the CN4 heat exchange thermistor CN9 CN15 stepping motor CN2 fan motor and CN21 Eco sensor FIXTURE SCREW FIXTURE SCREW FIXTURE SCREW ELECTRICAL COVER RAK 15QEF RAK 18 ...

Page 58: ...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 59: ...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 60: ...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 61: ... ERROR CODE 1 Set the remote to OFF 2 Press MODE button on the remote control to set it to mode 3 Press TEMPERATURE button of the remote control and set the room temperature on the remote control to 32 4 Hold down press TEMPERATURE button for about 2 seconds then press the ON OFF button 5 Transmission sign lights up with beep from indoor unit simultaneously and the error code will be displayed 6 U...

Page 62: ...OF MUTUAL INTERFERENCE Cut Attention Remove the battery before cutting Do not cut with electricity a Other indoor circuit breakers should be disconnected b Remore the back cover of the remote control c Cut the jumper as shown below d Press Reset button e Corresponding to the room electrical box dial code 6 to dial on f Please use the remote cotrol to check the available models of corresponding ind...

Page 63: ...pped Temporary operation SW Press and hold the 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 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 64: ...ON OFF ON OFF ON OFF 3 and page 3 8 9 64 ...

Page 65: ...DISPLAY OPERATION MODE SETTING ON OFF 65 ...

Page 66: ... FAN SPEED POWERFUL FAN SPEED POWERFUL HOW TO CHANGE THE INTERMITTENT FAN CONTROL SETTING 66 ...

Page 67: ...Fan speed during thermo oﬀ Ultra low Set fan speed When auto fanspeed is set the fan speed is low NOTE 1 3 POWERFUL ECO HOW TO CHANGE THE FAN SPEED IN COOLING MODE DURING THERMO OFF 67 ...

Page 68: ...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 69: ...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 70: ...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 71: ...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 72: ...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 73: ...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 74: ...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 75: ...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 76: ...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 77: ...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 78: ... 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 79: ...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 80: ...PARTS LIST AND DIAGRAM 2 1 10 26 33 3 4 5 32 12 21 23 24 25 30 29 16 15 14 28 31 27 34 9 8 6 13 11 20 22 35 19 17 18 20 7 INDOOR UNIT MODEL RAK 15QEF RAK 18 25 35 50REF RAK 25 35 50REFC 37 36 80 ...

Page 81: ...1 S COVER L 33 1 S COVER R 34 1 MOUNTING PLATE 35 1 RE H0LDER 36 1 SENSOR 37 1 PIPE COVER HWRAK 18PED A27 HWRAK 18REF A10 HWRAK 18RPE A05 HWRAK 18REF A11 HWRAS E10H3 919 HWRAK 18REF A04 HWRAK 50REF A02 HWRAK 18PED A09 HWRAK 18REF A07 HWRAK 18REF A08 HWRAK 18REF A09 HWRAK 18RPE A04 HWRAK 18PED A25 HWRAK 18PED A26 HWRAS E10H3 921 HWRAK 18REF A06 HWRAS 25YH4 A28 HWRAK 18PED A19 HWRAK 18PED A20 HWRAK ...

Page 82: ...JCH WH NO 0131E RAK 15QEF RAK 18REF RAK 25REF RAK 50REF RAK 25REFC RAK 35REFC RAK 35REF RAK 50REFC 82 ...

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