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2. ircuit diagram 2 1 Electronic control c 2 Outdoor uni AO jen L1nONIO 3AING YOLOW 4 az zeca 55 iE E H soor vii ayes 6 ng d oro ves AOA AGH AZL ASLO Im Ph H 5 MP AO RENE Buimojjoj eyy sessoidxe 901 550108 d 1 6wod ydee jo u3 s ey d1nowio NOUddH PI 40001 1109819 103dSNI 1N3uN O N31H3AN LINDAI AVM ie EHI x01 i ieu 09 t lt P YA Ls ze de A
3. 12KHR N 12KHR N 1 2 Display circuit diagram COM2 COMI 50301 5 at 51 Jet fat er f 491 a 52 2 a2 fer 2 92 _ s J L 2 2 pa EZ BI Sa zs ies e ssa s S R8IN S R sz z z z E R g WM szg LL LL ele STSTETSTS he sie ee els R Y00a1N0 2 282 yw R amod S Z amro AL Tmi 10 s SES wm nad zE z aS T GENIE ES 1 St 92 won a wl 1 1 zT uel av pat 8 Nowo g Qu i zc S 3 5 8 5 SYM SIC g ig 1 4 L 8 F i 8 CN17 CN18 vOE an Qn TOE an LOE qn 12KHR N 1 3 Printed wiring board For 2KHN model main PWB From cluster unit From fan motor From horizontal louver motor To vertical louver motor left To vertical louver m
4. C2 1 AUTO mode AUTO obliquely downward AUTO D D HEAT mode AUTO AUTO D D D D obliquely downward downward COOL DRY mode AUTO obliquely upward obliquely downward AUTO gt D D D COOL mode The open panel will be set obliquely downward for 10 minutes and then shift to obliquely upward to deliver cool air to the ceiling HEAT mode The open panel will be set obliquely backward when outlet air tempera ture is low and then shift to obliquely downward when outlet air becomes warm 7 DRY mode The open panel will be set obliquely upward 2 11 TIPS ABOUT AIR FLOW DIRECTION E When outlet air temperature is low 48 12KHR N 1 17 2 Horizontal air flow direction Press the HORIZONTAL AIR FLOW but ton to set the desired air flow direction GD Dn ORS CO CO CD V C2 4 CD ZIN x SWING CAUTION Never attempt to adjust the open panel and the lou vres manually Manual adjustment of the open panel and the louvres can cause the unit to malfunction 10 minutes later m3 When outlet air becomes warm LA 12KHR N 1 18 Difference of operation in Auto and Manual modes In the Auto mode the temperature setting is automatically determined based on the outside air temperature In additio
5. tup 12KHR N Function Operation Self diagnosis result display Description Detection period Reset condition Indoor Indoor Outdoor unit unit unit error display 26 Compressor rota Compressor stops if there is no Compressor operat Operation OFF or ON Yes 3 Yes Yes tion error at 120 input of position detection signal ing at 120 energizing energizing from compressor or input is abnormal 27 Outdoor unit DC fan Operation stops if there is no When outdoor unit Operation OFF or ON Yes 1 Yes Yes error input of rotation pulse signal from fan is in operation outdoor unit fan motor for 30 sec onds 28 PAM overvoltage Compressor stops if DC voltage is When in operation Operation OFF or ON Yes 1 Yes Yes error 400 V or higher 29 PAM clock error When power source frequency At compressor star Compressor contin None Yes Yes cannot be determined at startup tup when in opera ues operation with or when power source clock can tion out stopping not be detected for 1 continuous second at startup 1 The outdoor unit restarts four times before the indoor unit error is displayed complete shutdown 2 A single error judgment results in the display of the indoor unit error complete shutdown 3 The outdoor unit restarts eight times before the indoor unit error is displayed complete shutdown 2 AIR TO AIR HEAT PUMP OPERAT
6. 1i0 n 3 80 4 Heat exchange thermistor t TH2 Orange 25 C resistance 4 431 kQ 60 d o o Tester Tester o Room temperature g 40 4 thermistor TH1 Yellow 2 25 C resistance 10 kQ c 20 4 0 10 0 10 20 30 40 2 Outdoor unit thermistor temperature characteristics Connecto Connecto CN8 CN8 10 10 nh 500K4 o 40K4 O Resistance 400K Tester M Resistance atog Tester esistance KQ 30K4 44 57 In case of TH2 heat exchanger thermistor 2 Resistance at 25 C Resistance at 25 C 52 76 kQ 20Kk4 4 431 kQ 200K TH2 TH5 5 8K 3 06K 100K 4 2 28K 10K 1 72K 0 T T T T T 0 T T T T T 20 0 20 60 80 100 120 20 0 20 40 60 gt Temperature C gt Temperature C TH2 Heat exchanger thermistor TH3 Outdoor air temperature thermistor TH4 Suction thermistor TH5 2 way valve thermistor TH1 Compressor thermistor Thermistor No Connector Color 1 No 2 Red 3 No 4 Orange Outdoor air temperature thermistor TH3 No 5 6 Green 7 9 Before measuring resistance Compressorithermistor TH No disconnect connectors from PWB Heat exchanger thermistor TH2 No Suction thermistor TH4 No 7 No 8 Black 2 way valve thermistor TH5 No
7. Compressor Cold air preven Cold air preven tion tion deactivates too soon and cold air discharges operates at low speed or stops and frequency does not increase tion deactivates too slow tion does not deactivate and indoor unit fan does not rotate 12KHR N 2 Outdoor unit Item Mode Control opera When resis Short circuit When resis Open circuit tion tance is low tance is high temperature temperature judged higher judged lower than actual than actual Compressor Cooling Expansion valve Compressor Compressor high Layer short cir Outdoor unit ther chamber ther Dehumidifying control and com operates but temperature error cuit or open cir mistor open cir mistor TH1 Heating pressor protection room does not indication cuit may result in cuit error become cool or compressor in indication warm expansion normal operation valve is open Heat exchanger Cooling Outdoor unit heat Compressor Outdoor unit ther Normal operation Outdoor unit ther thermistor TH2 Dehumidifying exchanger over operates at low mistor short cir mistor open cir heat prevention speed or stops cuit error cuit error indication indication Heating Expansion valve Defrosting opera Outdoor unit ther Defrosting opera Outdoor unit ther control tion is not acti mistor short cir tion is activated mistor open cir Defrosting vated as needed
8. HW drive employs a bootstrap system and provides power to the upper phase IC The 15 V power supply for the lower phase IC is provided by the control printed circuit board PCB 4 1 1 Brief explanation of bootstrap system single power drive system To supply power to the upper phase IC the microcomputer IC1 turns ON the lower phase IGBT LU LV LW This results in a charging current that flows to the electrolytic capacitor of each upper phase IC input and charges the bootstrap capacitor with a 15 V current The power supply for the subsequent stages is charged while the lower phase IGBT is ON in ordinary compressor drive control Initial charge period Tee Charging current group P Vcc mo e Bootstrap capacitor i 1 Y HU HV HW EE A V 4 HVIC ES UVW A High voltage withstanding we 0 high speed recovery diode 3 i Ln K A N side LU LV LW IGBT 1 1 3 LVIC E EA we o N GND Bootstrap circuit 2 16 12KHR N 4 1 2 DC overcurrent detection circuit When a current of about 25 A or higher flows through the shunt resistance R49 on the control printed circuit board PCB the voltage at this resis tance is input to IPM CIN pin 15 Then the gate voltage of the lower phase IGBT LU LV LW inside the IPM turns OFF to cut off the overcurrent At the same time an L output of more the
9. Louvre angle fan speed I Select circuit m Wireless preheat Model select Y Serial I O circuit e Indoor outdoor control signal I O e Unit unit wiring AC power and serial signals Auto restart circuit e Test run circuit Test run forced operation Auxiliary mode Auxiliary mode button ON OFF Power on circuit Self diagnostics fault diagnosis lt m Cluster generator drive circuit m Cluster generator Louver motor drive circuit Horizontal How direction control Horizontal louver motor Louver motor drive circuit Vertical right How direction control Vertical louver motor right T 7 Louver motor drive circuit Vertical left How direction control Vertical louver motor left 1 LED Drive circuit LED display 12KHR N 2 Outdoor unit CPU Unit unit wiring AC power TNA and serial signals AC clock circuit ja 15A protection Pulse amplitube modulation circuit IGBT oN 20 Power supply circuit Smoothing Power factor Filter protection circuit converter circuit circuit CPU oscillator circuit PED 3 15A DC overvoltage detection circuit protection Outdoor fan drive circuit gt Outdoor fan oN r l 4 way valve relay drive circuit m 4
10. on the printed circuit board 1 25 2 Setting not memorized PCB the auto restart function can be disabled Timer setting 2 Explanation of cluster circuit The cluster unit generates cluster ions which are circulated throughout the room by the air flow created by the blower fan indoor unit fan motor in the air to air heat pump unit 1 When microcomputer output turns H the IC13 output changes to Lo turning ON the SSR1 and applying 100 V to the cluster unit for the gener ation of cluster ions positive and negative ions AC230V Microcomputer output R16 Cluster unit _ 3 Outline of PAM circuit 3 1 PAM Pulse Amplitude Modulation The PAM circuit varies the compressor drive voltage and controls the rotation speed of the compressor The IGBT shown in the block diagram charges the energy electromotive force generated by the reactor to the electrolytic capacitor for the inverter by turning ON and OFF Overvoltage detection circuit AC clock detection circuit Microcomputer IC 1 PAM drive circuit block diagram When the IGBT is ON an electric current flows to the IGBT via the reactor L5 and diode bridge DB2 When the IGBT turns OFF the energy stored while the IGBT was ON is charged to the voltage doubler capacitor via the diode bridge DB1 As such by varying the ON OFF duty of the IGBT the output voltage is varied 2 13 12KHR N DB1 TY Stored energy IG
11. MLB395 DC motor Indoor fan motor capacitor Transformer FUSE1 QFS GA078JBZZ 250V 3 15A 2 Outdoor Unit DESCRIPTION MODEL REMARKS Compressor DA111A1F22F DC motor Outdoor fan motor MLB078 DC motor Outdoor fan motor capacitor Fu4 QFS GA064JBZZ 250V 1A Fu3 QFS GA051JBZZ 250V 2A Fu2 QFS GA052JBZZ 250V 3 15A Fu1 QFS CA001JBZZ 250V 20A Fu5 6 QFS CA002JBZZ 250V 15A CHAPTER 2 OF CIRCUIT AND OPERATION 1 BLOCK DIAGRAMS 1 Indoor unit CPU DC power supply circuit 12KHR N Rectification circuit Fan motor PWM control circuit Indoor fan motor Rotation pulse input circuit Fan motor pulse detect AG clock circuit Remote controller signal reception circuit Wireless remote control operation Buzzer drive circuit Audible operation confirmation CPU reset circuit AC power 3 15A Fuse CPU oscillator circuit Room temp detect circuit Room temp thermistor Heat exchanger pipe thermo circuit Heat exchanger pipe thermistor EEPROM
12. N 3 Caution in checking printed circuit boards PWB 3 1 Non insulated control circuit The GND terminals of the low voltage circuits control circuits for microcomputer and thermistors and drive circuits for expansion valve and relays on the control printed circuit board PWB are connected to the compressor drive power supply 320 VDC negative terminal Therefore exercise utmost caution to prevent electric shock If a measuring instrument used for the test is grounded its chassis ground has the same electric potential as the 0 V probe Since non insulated cir cuits have the following voltage potential difference from the ground connection of the grounding wire results in a short circuit between the 0 V line and the ground thus allowing an excessive current to flow to the tester to cause damage If the sheaths of the thermistor lead wires or expansion valve lead wires inside the outdoor unit become damaged due to pinching by the front panel or other metal parts or contacting a pipe a high voltage can flow and destroy the circuits To prevent these problems carefully conduct assembly work Outdoor unit circuits Terminal board Reactor Point E 1 I T AR E 00 i AC230V TN 1 IPM M T 7 Compressor motor Ground 0 V line Point F 2 Do not touch the cabinet or bring metal parts into contact with the
13. circuit sequence AC voltage waveform Clock iGBT ON el 1 0 25 2 3mS 3 2 2 AC clock zero cross judgment The clock circuit determines the time from one rising point of the clock waveform to the next rising point The detected clock waveform is used to judge the power source frequency 50 Hz The zero cross of the AC voltage is judged as the rising of the clock waveform as shown in the diagram above 3 2 3 IGBT ON start time delay time B Basedon the zero cross of the AC voltage the IGBT turns ON after a delay time set according to the power source frequency 3 2 4 IGBT ON time C After the above delay time the IGBT turns ON to supply a current to the reactor The ON time of the IGBT determines the amount of energy level of DC voltage rise supplied to the reactor DC voltage level in each operation mode varies depending on external load conditions Cooling operation 260 to 280 V Heating operation 260 to 290 V 2 14 3 3 PAM protection circuit To prevent excessive voltage of PAM output from damaging the IPM and electrolytic capacitor as well as the control printed circuit board PCB this circuit monitors the PAM output voltage and turns off the PAM control signal and PAM drive immediately when an abnormal voltage output is generated At the same time it shuts off the compressor operation The PAM output voltage is distributed to pin 4 of the comparator IC8 If t
14. continu tion valve rises above ous minutes during cooling or 10 C dehumidifying operation Indoor unit heat Operating frequency lowers if When in heating Automatic reset after None Yes Yes exchanger over indoor unit heat exchanger tem operation safety period 180 heat shutdown perature exceeds overheat tem sec perature during heating operation Compressor stops if indoor unit heat exchanger temperature exceeds overheat temperature for 60 seconds at minimum fre quency Overheat temperature setting value indoor unit heat exchanger thermistor temperature about 45 to 54 C Outdoor unit heat Operation frequency lowers if out When in cooling or Automatic reset after None Yes Yes exchanger over door unit heat exchanger temper dehumidifying opera safety period 180 heat shutdown ature exceeds about 55 C during tion sec cooling operation Compressor stops if outdoor unit heat exchanger temperature exceeds about 55 C for 120 sec onds at minimum frequency Compressor dis Operating frequency lowers if When compressor is Automatic reset after None Yes Yes charge overheat temperature of compressor in operation safety period 180 shutdown chamber thermistor TH1 falls sec below about 110 C Compressor stops if temperature of compressor chamber ther mistor TH1 remains at about 110 C for 120 seconds in cooling operation or 60 seconds in heat ing operation at minimum fre quency Dehumidifying oper Compre
15. cuit error unnecessarily cuit error and frost accumu indication and room does indication lates on outdoor not become warm unit expansion expansion valve valve is closed is open Outside air tem Auto Operation mode Cooling mode is Outdoor unit ther Heating mode is Outdoor unit ther perature ther judgment activated even if mistor short cir activated even if mistor open cir mistor TH3 room tempera cuit error room tempera cuit error ture is low indication ture is high indication Cooling Operation not Normal operation Outdoor unit ther Normal operation Outdoor unit ther Dehumidifying affected mistor short cir mistor open cir cuit error cuit error indication indication Heating Rating control Defrosting opera Outdoor unit ther Defrosting opera Outdoor unit ther Defrosting tion is activated mistor short cir tion is not acti mistor open cir unnecessarily cuit error vated and frost cuit error indication accumulates on indication outdoor unit Suction pipe ther Cooling Expansion valve Compressor Outdoor unit ther Frost accumu Outdoor unit ther mistor TH4 Dehumidifying control operates but mistor short cir lates on evapora mistor open cir room does not cuit error tor inlet section cuit error become cool indication and room does indication expansion valve not become cool is open expansion valve is closed Heating Expansion valve Compressor Outdoor unit ther Frost
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17. 12KHR N SERVICE MANUAL SPLIT TYPE AIR TO AIR HEAT PUMP MODEL 12K HR N In the interests of user safety Required by safety regulations in some countries the set should be restored to its original condition and only parts identical to those specified should be used CONTENTS CHAPTER 1 SPECIFICATION UNIT INDEPENDENTLY eee 1 SPECIFICATION een 5 GENERAL TROUBLESHOOTING CHART 3 6 2 EXTERNAL 6 MALFUNCTION PARTS CHECK METH 3 WIRING DIAGRAM ee BP sss emm eere 4 ELECTRICAL PARTS ee 7 OUTDOOR UNIT CHECK METHOD 8 TROUBLESHOOTING GUIDE CHAPTER 2 EXPLAMATION OF CIRCUIT AND OP ERATION CHAPTER 4 REFRIGERATION CYCLE 1 BLOCK DIAGRAMS eee 1 FLOW FOW REFRIGERANT 2 MICROCOMPUTER CONTROL SYSTEM 2 3 2 STANDARD 3 eterne et 3 TEMPERATURE AT EACH PART AND PRESSURE IN 3 WAY CHAPTER 3 FUNCTION AND OPERATION OF PRO 4 PERFORMANCE CURVES TECTIVE PROCEDURES 1 PROTECTION DEVICE FUNCTIONS AND CHAPTER 5 DISASSEMBLING PROCEDURE OPERATIONS vereer 1 DISASSEMBLY OF INDOOR UNIT 2 AIR TO AIR HEAT PUMP OPERATION IN 2 DISASSEMBLY OF OUTDOOR UNIT THERMISTOR ERROR eee 3 THERMISTOR TEMPERATURE CH
18. 9 No 10 Yellow 12KHR N 4 HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY 1 Cooling in 40 Hz fixed mode To operate the outdoor unit independently short circuit the sections indicated by arrows in the diagram below with an adapter and apply 220 240 VAC between 1 and N on the terminal board of the outdoor unit This allows the outdoor unit to be operated in cooling mode independently Do not operate the outdoor unit in this condition for an extended period of time 5 GENERAL TROUBLESHOOTING CHART 1 Indoor unit does not turn on Short circuit negative terminal of capacitor C33 and jumper wire JP16 using IC clip etc Main cause Inspection method Normal value condition Remedy Cracked PWB Check visually There should be no cracking in Replace PWB Cracked pattern PWB or pattern Open circuit in FU1 Check melting of FU1 There should be no open circuit Replace PWB 250 V 3 15 A 2 Indoor unit fan does not operate Main cause Inspection method Normal value condition Remedy Open circuit in heat exchanger thermistor TH2 in heating oper ation Measure thermistor resistance dismount for check 1 Replace thermistor There should be no open circuit or faulty contact Replace thermistor Disconnected heat exchanger thermistor TH2 in heating oper ation Inspect connector on PWB Check t
19. AR Parts Guide ACTERISTICS ciini 4 HOW TO OPERATE THE OUTDOOR Parts marked with A are important for maintaining the safety of the set Be sure to replace these parts with specified ones for maintaining the safety and performance of the set El This document has been published to be used for after sales service only The contents are subject to change without notice 12KHR N CHAPTER 1 SPECIFICATION 1 SPECIFICATION 1 12KHR N MODEL INDOOR UNIT OUTDOOR UNIT ITEMS 12KHR N Rated cooling capacity Min Max kW 3 5 0 9 4 0 Rated heating capacity Min Max kW 4 6 0 9 6 5 Moisture removal at cooling Liters h 1 2 Electrical data Phase Single Rated frequency Hz 50 Rated voltage V 220 240 Rated current Cool A 4 2 0 9 5 7 Min Max Heat A 5 0 0 9 7 4 Rated input Cool W 920 200 1250 Min Max Heat W 1075 160 1700 Power factor xx Cool 96 95 Heat 96 92 Maximum operating current A 9 6 Compressor Type Hermetically sealed rotary type Model DA111A1F22F Oil charge 450cc Ester oil VG74 Refrigerant system Evaporator Louver Fin and Grooved tube type Condenser Corrugate Fin and Grooved tube type Control Expansion valve Refrigerant R410A 1180g De lce system Micro computer controled reversed systems Noise level High dB A 40 47 at co
20. BK BLACK GR GRAY BL BLUE RE RED BROWN WH WHITE YELLOW OR ORANGE wi GREEN YELLOW G Y GREEN YELLOW LOWER VERTICAL LEFT Op an BK BLACK BR BROWN WH WHITE OR ORANGE PIPE TA oel RIG HORIZONTAL FAN MOTOR INVERTER AIR CONDITIONER LED INDICATION FOR SELF DIAGNOSIS Em Ta Bining NO Abnormal Contents BOARD 1 Jort circuit of the outdoor thermistor 9 Overheat of the compressor Open circuit of the outdoor thermistor Abnormal AC current 2 5 6 DC over current 7 8 Abnormal wire connection 9 Abnormal thermistor of four way valve 10 EEPROM error of outdoor unit UNIT TO UNIT CORD 11 Abnormal outdoor fan motor 12 Thermal fuse error of outdoor unit 13 Abnormal compressor rotation 14 Abnormal PAM voltage and clock signal Jort circuit of serial signal line Al 17 Open circuit of serial signal line 9 Al normal fan motor of indoor unit 20 EEPROM error of indoor unit Indication of the abnormal condition LED indicator will blink ifthe set is in abnormal condition CAUTION CAUTION Te voltage is high 9 10 electrolytic capacitor on outdoor unit For maintenance discharge at C9 10 to prevent electric shock In case that fuse FUS has been fused the voltage is kept high at 9 10 TIRE THERMISTOR
21. BT LL NM I iF ij Jt This circuit brings the operating current waveform closer to the waveform of commercial power supply voltage to maintain a high power factor 3 2 High power factor control circuit Because of the capacitor input when the PAM circuit is OFF the phase of the current waveform deviates from the voltage waveform as shown below To prevent this deviation a current is supplied during the periods indicated by O in the diagram To determine the length of period to supply a current the zero cross timing of the AC input voltage is input to the microcomputer via the clock circuit The power source frequency is also determined at the same time The IGBT turns ON after the time length determined by the zero cross point to supply a current to the IGBT via the reactor This brings the current waveform closer to the voltage waveform in phase As described above the ON OFF operation of the IGBT controls the increase decrease of the compressor power supply voltage DC voltage to improve the compressor efficiency and maintain a high power factor by keeping the current phase closer to that of the supply voltage AC voltage waveform AC voltage waveform AC current waveform i Zero cross detection lt AC current waveform IGBT ON period AC voltage and current waveforms when PAM is OFF AC voltage and current waveform when PAM is ON 3 2 1 Detailed explanation of PAM drive
22. COMP TEMP 420V TH2 OR THERMISTOR HEAT EXCHANGER TEMP TH3 GN THERMISTOR OUTDOOR TEMP THERMISTOR SUCTION TEMP TSO LF 750uF LN 420V LED INDICATION SELF DIAGNOSIS ON OUTDOOR UNIT TED BLINKING ZA DANGER HIGH VOLTAGE No LED Indication pattern Abnormal comments No LED Indication pattern Abnormal comments g zt Mam TUUS 9 T O x Stimes Abnormal Thermistor or four way vane mpm E The micro computer s GND line which ile Abnormal signal ine 8 O x 10times EEPROM error 9 uc lashing 3 times for 2 second control the thermistor etc share the Ox Time Short circuit of the Thermistor 9D x11 times Abnormal outdoor fan motor Tons poing error same ine af an line Do mt touch 310x_ 2times Overheat error compressor and cycle 10 gt 12times Thermalfuse error of terminal board DOT iti alate s d 4 O x 5times Open circuit of the Thermistor TIO x times Rotation error ofthe compressor on may resul In electrical SOCS Nazar S OQ x times Abnormal DC current or compressor lock Wo o o o o o not earth oscilloscope etc as it SQ x 7times Abnormal AC current 12 0 x 14 times Abnormal PAM voltage and PAM clock may become damaged 4 ELECTRICAL PARTS 1 Indoor unit DESCRIPTION MODEL REMARKS Indoor fan motor
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24. ION IN THERMISTOR ERROR 1 Indoor unit Item Mode Control opera When resis Short circuit When resis Open circuit tion tance is low tance is high temperature temperature judged higher judged lower than actual than actual Room tempera Auto Operation mode Cooling mode is Cooling mode is Heating mode is Heating mode is ture thermistor judgment activated evenif activatedin most activated evenif always activated TH1 room tempera cases room tempera ture is low ture is high Cooling Frequency control Room becomes Air conditioner Room does not Compressor does too cold operates in full become cool not operate power even when set temperature is reached Dehumidifying Room tempera Normal operation Room tempera Normal operation Room tempera ture memory ture is stored in ture is stored in Frequency control memory as memory as 31 0 C and com 18 5 C and com pressor does not pressor does not stop operate Heating Frequency control Room does not Hot keep status Room becomes Air conditioner become warm results immedi too warm operates in full ately after opera power even when tion starts set temperature is Frequency does reached not increase above 30 Hz 40 Hz Heat exchanger Cooling Freeze preven Indoor unit evap Indoor unit evap Compressor Compressor does thermistor TH2 Dehumidifying tion orator may orator may stops occasion not operate freeze freeze ally Heating Cold air preven Cold air preven
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26. accumu Outdoor unit ther control operates but mistor short cir lates on expan mistor open cir room does not cuit error sion valve outlet cuit error become warm indication section and room indication expansion valve does not become is open warm expansion valve is closed 2 way valve ther Cooling Expansion valve Frost accumu Outdoor unit ther Compressor Outdoor unit ther mistor TH5 Dehumidifying control lates on indoor mistor short cir operates but mistor open cir unit evaporator cuit error room does not cuit error and room does indication become cool indication not become cool expansion valve expansion valve is open is closed Heating Operation not Normal operation Outdoor unit ther Normal operation Outdoor unit ther affected mistor short cir cuit error indication mistor open cir cuit error indication 12KHR N 3 THERMISTOR TEMPERATURE CHARACTERISTICS 1 Indoor unit thermistor temperature characteristics Figure 1 Temperature properties of indoor thermistors Thermistor Signal Color Room temperature Room temperature TH1 Yellow thermistor TH1 CN10 D Heat exchange TH2 Orange Heat exchange thermistor TH2 CN11 1 To measure the resistance first remove kQ the soldering as shown at right 100 4 TH1 TH2 CN0 eni
27. cabinet Reason The oscilloscope chassis ground has the same electric potential as the 0 V probe The entire electronic control section of the outdoor unit has a voltage potential difference from the ground as shown in the above diagram When the oscilloscope is set up the 0 V line and the ground voltage ground will be short circuited resulting in an excessive current flow to cause damage to the oscilloscope or indoor electric circuits 3 19
28. case of a serial short circuit the air to air heat pump contin ues operating without a malfunction code display The malfunction information is stored in memory and can be recalled later and shown on display N The self diagnostic memory can be recalled and shown on the dis play by stopping the operation and holding down AUX button for more than 5 seconds The content of self diagnosis malfunction mode is indicated by a flashing number For details refer to the troubleshooting section 1 15 2 Outdoor unit If a malfunction occurs LED1 on the outdoor unit flashes in 0 2 sec ond intervals as shown below Example Compressor high temperature abnormality ON M 1sec 1sec 0 6 sec 1 16 Information about auto mode In the AUTO mode the temperature setting and mode are automati cally selected according to the room temperature and outdoor temper ature when the unit is turned on Modes and Temperature Settings 0 10 18 28 434 temp C Cool Cool 25 C 26 C 29 Dr Room fem 21 Heat 22 C indoor temp C figures in are temperature settings During operation if the outdoor temperature changes the temperature settings will automatically slide as shown in the chart 2 10 1 17 Adjusting the air flow direction 1 17 1 Vertical air flow direction Press the VERTICAL AIR FLOW button to set the desired air flow direction
29. ce outdoor unit PWB assembly Power supply voltage is too low Measure power supply voltage during startup 2301410 VAC 50 Hz Make sure that power supply volt age is 200 V or higher Compressor lock eTemp fuse of terminal is error eEEEPROM error eAC Over current error Supply current and touch com pressor cover sound absorbing material to check if operation starts See Diagnosis Function and dis play mode on page 3 13 Compressor should start nor mally Malfunction display section 0 0 Compressor should start nor mally Apply external impact to com pressor Replace compressor eReplace terminal eReplace outdoor unit PWB eReplace outdoor unit PWB 9 Operation stops after a few minutes and restarts and this process repeats Main cause Inspection method Normal value condition Remedy Dried up electrolytic capacitor Measure 320VDC line voltage 300 V or higher Replace electrolytic capacitor Layer short circuit in expansion valve coil Measure resistance 46 3Q in each phase at 20 C Replace coil CAUTION If fuse FU1 FU4 FU5 outdoor unit control circuit board is blown be careful of charging voltage in inverter electrolytic capacitor C9 C10 To discharge stored electricity unplug the power cord and connect the plug of a soldering iron 230VAC 50W between the positive and negative terminals of inverte
30. d within range specified in manual Explain appropriate handling to user Open circuit or short circuit in wir ing of light receiving section Check if wires of light receiving section are caught Wires of light receiving section should not have any damage caused by pinching Replace wires of light receiving section Light receiving unit is defective Check signal receiving circuit measure voltage between termi nals 8 and 10 9 and 10 of con nector CN17 Tester indicator should move when signal is received Replace PWB 12KHR N Main cause Inspection method Normal value condition Remedy Dew condensation on light receiv ing unit Check for water and rust Signal should be received within range specified in manual Take moisture proof measure for lead wire outlet of light receiving section 5 Louvers do not move Main cause Inspection method Normal value condition Remedy Caught in sliding section Operate to see if louvers are caught in place Louvers should operate smoothly Remove or correct catching sec tion Disconnected connector CN13 CN16 CN19 on relay PWB lou ver motor side Inspect connectors Connectors or pins should not be disconnected Install correctly Contact of solder on PWB connector section on PWB Check visually There should not be solder con tact Corr
31. dependent of the location of rotor detecting the phase difference between driving voltage phase and line current phase flowing in motor coil and controls the modulation rate data to get the phase difference at the best efficiency 2 18 12KHR N CHAPTER 3 FUNCTION AND OPERATION OF PROTECTIVE PROCEDURES 1 PROTECTION DEVICE FUNCTIONS AND OPERATIONS Function Operation Self diagnosis result display Description Detection period Reset condition Indoor Indoor Outdoor unit unit unit error display Indoor unit fan lock Operation stops if there is no When indoor unit fan Operation OFF or ON x2 Yes None input of rotation pulse signal from is in operation indoor unit fan motor for 1 minute Indoor unit fan rota Operation stops if rotation pulse When indoor unit fan Operation OFF or ON 2 Yes None tion speed error signal from indoor unit fan indi is in operation cates abnormally low speed about 300 rpm or slower Indoor unit freeze Compressor stops if temperature When in cooling or Automatic reset when None None prevention remains below 0 C for 4 minutes dehumidifying opera heat exchanger tem tion perature rises above freeze prevention temperature 2 C or higher 2 way valve freeze Compressor stops if temperature When in cooling or Automatic reset when None Yes Yes prevention of outdoor unit 2 way valve dehumidifying opera temperature of 2 way remains below 0 C for 10
32. difying or heating operation is shut down but the outdoor unit fan continues operation for 50 seconds before it stops 1 11 Defrosting 1 11 1 Reverse defrosting The defrost operation starts when the compressor operating time exceeds 20 minutes during heating operation as shown below and the outside air temperature and the outdoor unit heat exchanger tem perature meet certain conditions When the defrost operation starts the indoor unit fan stops The defrost operation stops when the out door unit heat exchanger temperature rises to about 13 C or higher or the defrosting time exceeds 10 minutes 20 min or more 20 min or more 20 min or more L Start of heating operation Defrosting Defrosting Max 10 min Max 10 min 1 12 ON timer The ON timer can be activated by pressing the ON timer button When the ON timer is activated the operation start time is adjusted based on fuzzy logic calculations 1 hour before the set time so that the room temperature reaches the set temperature at the set time 1 13 OFF timer The OFF timer can be activated by pressing the OFF timer button When the OFF timer is set the operation stops after the set time When this timer is set the compressor operating frequency lowers for quieter operation and the room temperature is gradually varied after one hour reduced 1 C three times max 3 C in heating or increased 0 3 C three times max 1 C in cooling or dehumidify
33. e of displaying two digits right of the decimal point 0 019 5 Expansion valve check Measure expansion valve coil resis Each phase 46 30 at 20 C Replace expansion valve tance 6 Final check Turn off power and connect compres Compressor should operate nor Replace control PWB Sor cords to compressor Operate air conditioner Measure DC voltage between IPM pins 20 and 24 mally 320 VDC or higher Replace outdoor unit thermistor Replace compressor in case of compressor lock 3 11 12KHR N 2 Troubleshooting of outdoor unit electric components Check 220 240VAC input voltage D LED light NO Check 320VDC Short circuit in DC fan motor pes Ignt between IPM pins Short circuit in IPM 20 and 24 Short circuit in diode bridge YES Blown fuse Defective electrolytic capacitor Wire disconnection PWB pattern damage Short circuit in PAM IGBT Q5 Check switching Defective switching power supply circuit power supply Malfunction of 3 terminal regulator IC4 IC1 output of 12 VDC Short circuit in expansion valve coil 15 VDC Malfunction of transistor array IC7 Solder contact or other problems Check 5 VDC output Malfunction of 3 terminal regulator IC4 IC1 YES Microcomputer oscillator error Malfunction of microcomputer reset IC Malfunction of microcomputer NO Malfunction of serial signal circuit 2 Does LED fashi Check wiring between indoor and outdoor units YES 3 12 12KHR
34. ect contacting section 6 There is noise in TV radio Main cause Inspection method Normal value condition Remedy Grounding wires not connected properly Check grounding wire connec tions Grounding wires should be con nected properly Connect grounding wires prop erly TV radio is placed too close to outdoor unit Check distance between TV radio and outdoor unit If TV radio is placed too close it may become affected by noise Move TV radio away from outdoor unit Other than above Check for radio wave interfer ence 7 Malfunction occurs Main cause Inspection method Normal value condition Remedy Malfunction caused by noise Check for radio wave interfer ence 8 Compressor does not start Main cause Inspection method Normal value condition Remedy Erroneous inter unit connection Check wiring between indoor and outdoor units Terminal board 1 N 220 240 VAC 50 Hz Terminal board 2 serial signal Correct wiring Damaged IPM Check IPM continuity See IPM check method on page 3 10 Replace IPM Dried up electrolytic capacitor Check electrolytic capacitor See Inverter electrolytic capaci tor C9 C10 check method on page 3 9 Replace electrolytic capacitor Blown outdoor unit fuse Check 20A fuse Check 15A fuse Fuse should not be blown Replace fuse diode bridge Replace fuse Repla
35. error frequency is 50 Hz or higher and in operation outdoor AC current is about 2 0 A or lower 13 Thermistor installa Compressor stops if high and low 3 minutes after com Operation OFF or ON Yes 1 Yes Yes tion error or 4 way values of temperatures detected pressor startup valve error by outdoor unit heat exchanger thermistor TH2 and 2 way valve thermistor TH5 do not match operating cycle 14 Compressor high Compressor stops if compressor When in operation Operation OFF or ON Yes 1 Yes Yes temperature error chamber thermistor TH1 exceeds about 114 C or if there is short circuit in TH1 15 Outdoor unit heat Compressor stops if there is At compressor star Operation OFF or ON Yes 1 Yes Yes exchanger ther short circuit in outdoor unit heat tup mistor short circuit exchanger thermistor TH2 error 16 Outdoorunitoutside Compressor stops if there is At compressor star Operation OFF or ON Yes 1 Yes Yes air temperature short circuit in outdoor unit out tup thermistor short cir side air temperature thermistor cuit error TH3 17 Outdoor unit suction Compressor stops if there is At compressor star Operation OFF or ON Yes 1 Yes Yes thermistor short cir short circuit in outdoor unit suc tup cuit error tion thermistor TH4 18 Outdoor unit 2 way Compressor stops if there is At compressor star Operation OFF or ON Yes 1 Yes Yes valve thermistor short circuit in outdoor unit 2 way tup shor
36. hermistor installation con dition Thermistor should not be discon nected Install correctly 3 Indoor unit fan speed does not change Main cause Inspection method Normal value condition Remedy Remote control is not designed to allow fan speed change in several operation mode Check operation mode Fan speed should change except during dehumidifying operation ventilation light dehumidifying operation internally normal oper ation Explain to user 4 Remote control signal is not received Main cause Inspection method Normal value condition Remedy Batteries at end of service life Measure battery voltage 2 5 V or higher two batteries in series connection Install new batteries Batteries installed incorrectly Check battery direction As indicated on battery compart ment Install batteries in indicated direc tion Lighting fixture is too close or Fluorescent lamp is flickering in the room Turn off light and check Signal should be received when light is turned off Change light position or install new fluorescent lamp Sevick light Hitachi is used in the room Check room lights Signal may not be received sometimes due to effect of Sevick light Replace light or change position Operating position angle are inappropriate Operate within range specified in manual Signal should be receive
37. his voltage exceeds the ref erence voltage at pin 5 of the IC8 the output of the comparator IC8 reverses from H to L and it is input to pin 38 of the microcomputer IC1 to halt the PAM drive The protection voltage level is as follows 3 3 1 Details of troubleshooting procedure for PAM 1 PAM shutdown due to error 15V e R112 R114 215K 12KHR N Overvoltage detection R115 a IC1 ab R116 if y 1K ov During abnormal voltage output pag 1 When the DC voltage detection circuit sends a signal exceeding the specified voltage to the microcomputer DC voltage of 400 V or higher detection circuit input voltage of about 8 4 V or higher IC8 pin 4 When an error is detected PAM IGBT turns OFF Compressor turns OFF All units shut down completely when the error occurs four times 2 When the outdoor unit clock waveform differs from the specified value immediately before the PAM IGBT turns ON When there is no clock waveform input When a clock signal of other specified power source frequency 50 Hz is input When an error is detected PAM IGBT does not turn ON Compressor operates normally Complete shutdown does not occur 2 PAM error indication In case of error 1 An error signal is sent to the indoor unit as soon as an error is generated Malfunction No 14 0 is indicated when the error code is called out by the indoor unit s se
38. hortage y YES Does LED1 indicate Replace outdoor unit PWB rotation error NO NO Y Normal Replace compressor CAUTION Please take care for electrical shock when you work to change defective parts or disconnect wires of defective application The outdoor unit has energy changed for a while even after unplugging the power supply cord After changing the part or unit please retry check procedure from the beginning 12KHR N 2 Procedure for determining defective expansion valve Measure resistance in expansion valve coil ormal resistance between red terminal of expansion valve lead wire and each terminal about 46Q at 20 C LED red Checker Insert checker shown at left into connector CN12 on control PWB and operate air conditioner SS eS 5 6K 5 6K 5 6K 5 6K Do LEDs on checker light in orderly sequence lighting of 1 LED gt lighting of 2 LEDs NO Replace control PWB 6 5 4 3 2 1 Connector J S T XAP 06V 1 Terminal SXA 001T P0 6 Thermistors in normal condition If frost accumulates on 2 way valve after 10 to 20 minutes of cooling operation then thermistors with yellow and black lead wires may be defective Check these thermistors Defective thermistor Y Replace expansion Replace thermist
39. ing operation so that the room temperature remains suitable for comfortable sleeping Heating operation Set temperature 34 1 C 1 Activation of 1 hour Max Max Timer setting OFF timer later 1 5 hours 2 hours reached later later Cooling dehumidifying operation 0 3 C ose tte Euer 3 Set temperaturer i 1 1 l I I I I 1 I Activation of 1 hour Max Max Timer setting OFF timer later 1 5 hours 2 hours reached later later 1 14 Power ON start If a jumper cable is inserted in the location marked with HAJP on the indoor unit control printed circuit board control PCB connecting the power cord to an AC outlet starts the air to air heat pump in either cool ing or heating mode which is determined automatically by the room temperature sensor When a circuit breaker is used to control the ON OFF operation please insert a jumper as described above 1 15 Self diagnostic malfunction code display 1 15 1 Indoor unit 1 When a malfunction is confirmed a flashing malfunction code num ber is displayed to indicate the type of malfunction When the air to air heat pump is in non operating condition holding down AUX button for more than 5 seconds activates the malfunc tion code display function The operation continues only in the case of a serial open circuit and the main relay turns off after 30 seconds if the open circuit con dition remains In the
40. ion signal actual PWM waveform output timing is determined Since it does not use a filter circuit the detection accuracy is high The microcomputer performs internal processing to cancel spike voltage during the regenerative process Furthermore even if the induced voltage is low position detection is still possible thus allowing sensor less operation at low rotation speed in the ini tial stage of operation This reduces the starting current and improves the IPM reliability Terminal voltage waveform Reference voltage 1 2 of DC voltage Spike voltage cancelled Comparator output waveform Position signal waveform 6 180 Energizing Control This is the control system to moderate the speed by the current phase difference for higher efficiency and lower noise of the compressor The current phase difference control is the control system paid attention to the interrelation between efficiency and phase gap generated by the applied voltage of motor and current in the coil of motor as shown in the figure below Motor voltage Motor current gt F Difference of current Efficiency Best timing and voltage peak Voltage Current phase difference Concept chart of the current phase difference control This control is the V F drive system in
41. ion stops temporarily in order to prevent freezing When the temperature of the indoor unit heat exchanger rises to 2 C or higher after about 180 seconds the compressor restarts and resumes normal operation 1 4 Outdoor unit 2 way valve freeze prevention control If the temperature of the outdoor unit 2 way valve remains below 0 C for 10 consecutive minutes during cooling or dehumidifying operation the compressor operation stops temporarily in order to prevent freez ing When the temperature of the 2 way valve rises to 10 C or higher after about 180 seconds the compressor restarts and resumes normal operation 12KHR N 1 5 Indoor unit overheat prevention control During heating operation if the temperature of the indoor unit heat exchanger exceeds the indoor unit heat exchanger overheat preven tion temperature about 45 to 54 C which is determined by the operat ing frequency and operating status the operating frequency is decreased by about 4 to 15 Hz Then this operation is repeated every 60 seconds until the temperature of the indoor unit heat exchanger drops below the overheat protection temperature Once the temperature of the indoor unit heat exchanger drops below the overheat protection temperature the operating frequency is increased by about 4 to 10 Hz every 60 seconds until the normal oper ation condition resumes If the temperature of the indoor unit heat exchanger exceeds the over heat protection temperatu
42. k compressor NO 2 3 way valve closed Refrigerant shortage y YES Does LED1 indicate Replace outdoor unit PWB rotation error NO NO Y Normal Replace compressor 7 OUTDOOR UNIT CHECK METHOD After repairing the outdoor unit conduct the following inspection procedures to make sure that it has been repaired completely Then operate the compressor for a final operation check 3 10 1 Checking procedures 12KHR N No Item Check method Normal value condition Remedy 1 Preparation Disconnect compressor cords white orange red 3 wires from compres sor terminals and connect simulated load lamp used as load Operate air conditioner in cooling or heating test operation mode 2 Inverter DC power supply Measure DC voltage between IPM 320 VDC Replace control PWB voltage check pins 20 and 24 Replace diode bridge Correct soldered section of Fas ten tabs BT1 2 5 6 10 11 JPL1 2 5 6 on control PWB Repair solder cracks 3 IPM circuit check Check that 3 lamps load light Each voltage should be normal Replace control PWB Check position detection voltage 15 All 3 lamps load should light with V 5 V on control PWB same intensity 4 Compressor check Measure compressor coil resistance Resistance value at 20 C 0 65Q Correct connections at compres for each phase of U V and W sor terminals Use multi meter or digital tester capa Replace compressor bl
43. lf diagnosis function The LED on the outdoor unit flashes 14 times when an error is generated The LED continues flashing in the 14 time cycle even after the compressor stops operating The LED turns off data is deleted from the memory when the outdoor unit power is turned off In case of error 2 An error signal is sent to the indoor unit as soon as an error is judged Malfunction No 14 1 is indicated when the error code is called out by the indoor unit s self diagnosis function The LED on the outdoor unit flashes 14 times when an error is judged The LED on the outdoor unit flashes in normal pattern when the compressor stops operating Compressor OFF from remote control When a user complains that the air to air heat pump does not provide sufficient cool air or warm air In addition to conventional error generating reasons there is a possibility that the PAM IGBT does not turn ON even if the compressor is operating In that case the DC voltage does not rise even though the compressor is operating Check items Clock circuit check PAM IGBT check Fuse Fu6 open circuit check 2 15 12KHR N 4 Explanation of IPM drive circuit The IPM for compressor drive is made by Mitsubishi Electric The power supply for the IPM drive and the shunt resistance for overcurrent detection are provided outside the IPM 4 1 IPM drive power supply circuit The power supply for the upper phase IGBT HU HV
44. n the air to air heat pump oper ation differs from the operation in the Manual mode as explained below 1 18 1 Difference relating to set temperature Auto mode Manual mode Cooling Heating Dehumidifying Cooling Heating Dehumidifying Temperature Automatic temperature setting based on outside air tem Can be changed Can be changed Automatic setting setting perature Can be changed within 2 C using remote con between 18 and 32 C between 18 and 32 C Can be changed method trol using remote control using remote control within 2 C 1 19 Dehumidifying operation control ZONE COM FAN If the room temperature is 26 C or higher when dehumidifying opera PRESSOR tion starts the dehumidifying operation provides a low cooling effect in Hot keep When AUTO accordance with the room temperature setting automatically deter room temperature Ultra soft mined based on the outside air operation The setting value is the reaches setting tem OFF Lower than Fan same as the set temperature for cooling operation in the auto mode perature speed soft If the room temperature is lower than 26 C when dehumidifying opera SOFT tion starts the dehumidifying operation minimizes the lowering of the LOW Keep the setting room temperature HIGH 1 20 Self Clean operation Heating or Fan operation and Cluster operation are performed simulta neously The judgment of whether Heating or Fa
45. n 20us is generated from IPM Fo pin 14 and this results in an L input to overcurrent detection input pin 34 of the microcomputer IC1 and turns OFF the PWM signal output IC1 pins 51 through 56 to the IGBT gate r sd SET Protection circuit status RESET Lower phase Internal IGBT gate About 25 A L SC a1 Output current Ic A 2 Sense voltage relative to shunt resistance Delay by CR time constant circuit More than 20 4 s Error output Fo IPM Shunt resistance K K AK R49 Overcurrent gt N 5V e e IC1 NW 64 IPM overcurrent CiN detection circuit FO ov t 6 60 2 17 12KHR N 5 120 energizing control digital position detection control This control system detects the digital position detection signal and adjusts the rate of acceleration deceleration accordingly The motor s induced voltage waveform is input to the comparator in the form of PWM switched pulse waveform and a position detection signal is generated as a reference voltage equaling 1 2 of 280 VDC However since there is no induced voltage waveform when the PWM waveform is OFF the microcomputer performs internal processing so that detection is enabled only when it is ON Based on the detected posit
46. n operation is used is based on the outside air temperature at 3 minutes after the start of internal cleaning The operation stops after 40 minutes The air to air heat pump shows the remaining minutes 40 39 gt 38 3 gt 2 1 Heating operation Fan operation 24 C Outside air temperature 1 21 Plasmacluster lon function The Plasmacluster lon generator inside the air conditioner will release positive and negative plasmacluster ions into the room Approximately the same numbers of positive and negative ions released into the air will reduce some airborne mold During operation press the PLASMACLUSTER button ton tt The remote control will display 7 The blue PLASMACLUSTER lamp on the unit will light up TO CANCEL Press the PLASMACLUSTER button again The PLASMACLUSTER lamp on the unit will turn off NOTE Use of the PLASMACLUSTER operation will be memo rized and it will be activated the next time you turn on the air conditioner To turn off the PLASMACLUSTER lamp press the DIS PLAY button To perform the PLASMACLUSTER operation in FAN only mode press the PLASMACLUSTER button while the unit is not operating The mode symbol of the remote control will go off and the fan speed can not be set to AUTO 1 22 Hot keep If the room temperature is in the Hot keep zone during heating the compressor is turned off to prevent overheating 0 60 Set temperature 1 23 Win
47. oling Low dB A E Soft dB A 27 Fan system Drive Direct drive Air flow quantity High m3 min 9 3 322 at cooling Low m3 min 7 6 Soft m3 min 5 2 Fan Cross flow fan Propeller fan Connections Refrigerant coupling Flare type Refrigerant tube size Gas Liquid 3 8 1 4 Drain piping mm O D 16 Others Safety device Compressor Thermal protector Fan motors Thermal fuse Fuse Micro computer control Air filters Polypropylene net Washable Net dimensions Width mm 790 780 Height mm 260 540 Depth mm 290 265 Net weight kg 11 36 NOTE The conditions of star marked item are based on EN14511 12KHR N 290 Unit mm 2 EXTERNAL DIMENSION 1 Indoor unit _ 1118 5 22 0 sup vce 666 165 167 5 265 14 58 798 540 780 2 Outdoor unit TL 12KHR N 3 WIRING DIAGRAM 1 Indoor unit WIRING DIAGRAM _ INDOOR UNIT RD RED 2 Outdoor unit WIRING DIAGRAM lt CC632 1 TERMINAL INDOOR BOARD UNIT V 1 POWER SUPPLY SINGLE PHASE
48. or assembly valve assembly 3 Diode bridge check method Turn off the power and let the inverter electrolytic capacitor C9 C10 discharge completely Then use a tester and check continuity When using a digital tester the and tester lead wires in the table must be reversed Needle type tester Normal resistance value 6 XO oats O O 45 B several MQ Value in is for digital tester 4 Inverter electrolytic capacitor C9 C10 check method Turn off the power let the inverter electrolytic capacitor C9 C10 discharge completely and remove the capacitor from the control printed circuit board PWB First check the case for cracks deformation and other damages Then using a needle type tester check continuity Determination of normal condition The tester needle should move on the scale and slowly returns to the original position The tester needle should move in the same way when polarities are reversed When measurement is taken with the polarities reversed the tester needle exceeds the scale range Therefore let the capacitor discharge before measurement 12KHR N 5 IPM check method Turn off the power let the large capacity electrolytic capacitor C10 discharge completely and dismount the IPM Then using a tester check leak current between C and E When using a digital tester the and tester lead
49. otor right ur n Bes ee HOHHH Bes x SnAgCu q From sensor PWB From pipe thermistor relay connector For 2KHN model sensor PWB O COPS se 15 He CUm rO To main PWB 12KHR N For 2KHN model connection PWB From hang From panel From panel From display From display From panel From panel From hang motor left motor left SW left PWB black PWB yellow SW right motor right motor right tu 1 cheog2 1602 a 1CN03 41 C608 2 1 CNBOT 10805 5 Md EEE BCN603 O msn MEN ere egen Reb O S i n BCN602 To main PWB To main PWB To main PWB To main PWB For 2KHN model display PWB To connection PWB FSCY ME eK7 _ OPHONANSBZZ AN 5 12KHR N
50. ow the overheat protection temperature 100 C Once the temperature of the compressor drops below the overheat protection temperature the operating frequency is increased by about 4 to 10 Hz every 60 seconds until the normal operation condition resumes If the temperature of the compressor exceeds the overheat protection temperature for 120 seconds in cooling operation or 60 seconds in heating operation at minimum operating frequency the compressor stops operating and then restarts after about 180 seconds and the abovementioned control is repeated 1 8 Startup control When the air to air heat pump starts in the cooling or heating mode if the room temperature is 2 C higher than the set temperature in cool ing operation or 3 5 C lower in heating operation the air to air heat pump operates with the operating frequency at maximum Then when the set temperature is reached the air to air heat pump operates at the operating frequency determined by fuzzy logic calculation then enters the normal control mode after a while 12KHR N 1 9 Peak control If the current flowing in the air to air heat pump exceeds the peak con trol current the operation frequency is decreased until the current value drops below the peak control current regardless of the frequency control demand issued from the indoor unit based on the room temper ature 1 10 Outdoor unit fan delay control The compressor stops immediately after cooling dehumi
51. r electrolytic capacitor C9 C10 12KHR N 6 MALFUNCTION PARTS CHECK METHOD 1 Procedure for determining defective outdoor unit IPM compressor The following flow chart shows a procedure for locating the cause of a malfunction when the compressor does not start up and a DC overcurrent indi cation error occurs Connect power cord to AC outlet Check 220 240 VAC between 1 and N on outdoor unit PWB Replace outdoor unit PWB YES No NO Is LED1 on outdoor Does LED remain iit LOM Check 320 VDC between NO Disconnect CN3 lead _ LED1 is flashing unit flashing pins IPM 20 and 24 wires of FAN motor YES YES YES YES Replace FAN motor y NO Using remote control Serial signal error FUSE and 12 V 15 V Disconnect CN12 operate air conditioner Check inter unit wiring 18V on PWB expansion valve so that compressor Check indoor and starts outdoor unit PWBs YES y LED1 is still off Y Replace outdoor unit PWB Compressor starts up Immediately after startup Replace expansion valve a ES LED1 is flashing LNO Replace outdoor unit PWB y YES Does LED1 indicate Replace outdoor unit DC overcurrent error PWB Check compressor NO 2 3 way valve closed Refrigerant s
52. re for 60 seconds at minimum operating fre quency the compressor stops operating and then restarts after about 180 seconds and the abovementioned control is repeated 1 6 Outdoor unit overheat prevention control During cooling operation if the temperature of the outdoor unit heat exchanger exceeds the outdoor unit heat exchanger overheat preven tion temperature about 55 C the operating frequency is decreased by about 4 to 15 Hz Then this operation is repeated every 60 sec onds until the temperature of the outdoor unit heat exchanger drops to about 54 C or lower Once the temperature of the outdoor unit heat exchanger drops to about 54 C or lower the operating frequency is increased by about 4 to 10 Hz every 60 seconds until the normal operation condition resumes If the temperature of the outdoor unit heat exchanger exceeds the out door unit heat exchanger overheat protection temperature for 120 sec outdoor temperature gt 40 C e 60 sec outdoor temperature lt 40 C at minimum operating frequency the compressor stops operating and then restarts after about 180 seconds and the abovementioned con trol is repeated 1 7 Compressor overheat prevention control If the temperature of the compressor exceeds the compressor over heat prevention temperature 110 C the operation frequency is decreased by about 4 to 10 Hz Then this operation is repeated every 60 seconds until the temperature of the compressor drops bel
53. ssor stops if outside air When in dehumidify Automatic reset when None Yes Yes ation temporary temperature thermistor is lower ing operation outside air tempera stop than about 16 C during dehumidi ture rises above fying operation 16 C DC overcurrent Compressor stops if DC current When compressor is Operation OFF or ON Yes 1 Yes Yes error of about 25 A or higher flows in in operation IPM 12KHR N Function Operation Self diagnosis result display Description Detection period Reset condition Indoor Indoor Outdoor unit unit unit error display 9 AC overcurrent Operating frequency lowers if out When compressor is Operation OFF or ON Yes 1 Yes Yes error door AC current exceeds peak in operation control current value outdoor stops if compressor AC current exceeds peak control current value at minimum frequency 10 AC overcurrent Indoor and outdoor units stop if When compressor is Replacement of Yes 2 Yes Yes error in compressor outdoor AC current exceeds in non operation defective parts such OFF status about 3 A while compressor is in as IPM non operation status 11 AC maximum cur Compressor stops if coutdoor When compressor is Operation OFF or ON Yes 1 Yes Yes rent error current exceeds 17 A in operation 12 AC current defi Compressor stops if operating When compressor is Operation OFF or ON Yes 1 Yes Yes ciency
54. start control Once the compressor stops operating it will not restart for 180 sec onds to protect the compressor Therefore if the operating compressor is shut down from the remote control and then turned back on immediately after the compressor will restart after a preset delay time The indoor unit will restart operation immediately after the ON switch is operated on the remote control Compressor operation Compressor ON Compressor can Compressor remains OFF turn ON for 180 seconds A gt A4 OFF operation on operation on Compressor ON remote control remote control 1 2 Cold air prevention control When the air to air heat pump starts up in heating mode the indoor unit fan will not operate until the temperature of the indoor unit heat exchanger reaches about 23 C in order to prevent cold air from blow ing into the room Also the indoor unit fan operates at low speed until the temperature of the indoor unit heat exchanger reaches about 38 C so that people in the room will not feel chilly air flow Indoor unit heat exchanger temperature Set fan speed 38 C OO nn 35 C Indoor unit fan at low speed 23 C 21 C Indoor unit fan in non operation 1 3 Indoor unit heat exchanger freeze prevention control If the temperature of the indoor unit heat exchanger remains below 0 C for 4 consecutive minutes during cooling or dehumidifying opera tion the compressor operat
55. t circuit error valve thermistor TH5 19 Outdoor unit heat Compressor stops if there is At compressor star Operation OFF or ON Yes 1 Yes Yes exchanger ther open circuit in outdoor unit heat tup mistor open circuit exchanger thermistor TH2 error 20 Outdoor unit outside Compressor stops if there is At compressor star Operation OFF or ON Yes 1 Yes Yes air temperature open circuit in outdoor unit out tup thermistor open cir side air temperature thermistor cuit error TH3 21 Outdoor unit suction Compressor stops if there is At compressor star Operation OFF or ON Yes 1 Yes Yes thermistor open cir open circuit in outdoor unit suc tup cuit error tion thermistor TH4 22 Outdoor unit 2 way Compressor stops if there is At compressor star Operation OFF or ON Yes 1 Yes Yes valve thermistor open circuit in outdoor unit 2 way tup open circuit error valve thermistor TH5 23 Outdoor unit dis Compressor stops if there is At compressor star Operation OFF or ON Yes 1 Yes Yes charge thermistor open circuit in outdoor unit dis tup open circuit error charge thermistor TH1 24 Serial signal error Compressor stops if outdoor unit When in operation Reset after reception None None None cannot receive serial signal from of serial signal indoor unit for 30 seconds 25 Compressor star Compressor stops if compressor At compressor star Operation OFF or ON Yes 3 Yes Yes tup error fails to start up
56. ter cool Cooling operation is available during the winter season by the built in winter cool function Lower limit of outdoor temperature range is 10 C DB When the outside air temperature is low the outdoor unit fan operates at slower speed NOTE Built in protect device may work when outdoor temperature falls below 21 C DB depending on conditions 1 24 10 C OPERATION Heating operation with 10 C set temperature will be performed 1 Press the MODE button of Remote controller and select HEAT mode 2 Press the ON OFF button to start HEAT operation 3 Press the 10 C button The remote control will display 10 C TO CANCEL Press the 10 C button again 1050 operation will also be cancelled when the operation mode is changed or when the unit is turned off NOTE 10 C operation will not be available with heating operation auto matically selected by AUTO mode 1 25 Auto restart When power failure occures after power is recovered the unit will automatically restart in the same setting which were active before the power failure 1 25 1 Operating mode Cool Heat Dry Temperature adjustment within 2 C range automatic operation Temperature setting Fan setting Air flow direction 2 12 12KHR N Power ON OFF Full power setting Automatic operation mode setting Internal cleaning Swing louvre 1 25 3 Disabling auto restart function By removing cutting jumper 8 JP8
57. way valve LAM 15A DC overcurrent detection circuit protection m Power transistor module drive circuit Power transistor module e haak Serial I O circuit m CPU reset circuit Position detection circuit Y Compressor mac overcurrent detection circuit Current transformer ed Compressor thermo circuit Compressor thermistor Heat exchanger pipe thermo circuit Heat exchanger pipe thermistor Outdoor temp thermo circuit gt EEPROM It 3 Outdoor temperature thermistor LED drive circuit LED Test mode circuit Expansion valve drive circuit Suction temp thermo circuit Expansion valve Suction pipe thermistor 2 way valve temp thermo circuit 2 way valve thermistor Terminal board Terminal fuse circuit Terminal board Terminal fuse 2 MICROCOMPUTER CONTROL SYSTEM 1 Indoor unit 1 1 Electronic control circuit diagram sem a2 Joz a Jaz 2 o
58. wires in the table must be reversed Needle type tester Normal resistance value Needle type tester Normal resistance value iu P N oo U several MQ V several V Ww Ww Values in are for digital tester 5 1 IPM internal circuit diagram Connect power cord to AC outlet Check 220 240 VAC between 1 and N on outdoor unit PWB Replace outdoor unit PWB YES No NO Is LED1 on outdoor e Does LED1 remain lit unlit Check 320 VDC between INO Disconnect CN3 lead __ LED1 is flashing unit flashing pins IPM 20 and 24 wires of FAN motor YES YES YES YES Replace FAN motor Y 1 NO Using remote control Serial signal error FUSE and 12 V 15 V 5 Disconnect CN12 operate air conditioner Check inter unit wiring 18V on PWB expansion valve so that compressor Check indoor and starts outdoor unit PWBs YES y LED is still off Y Replace outdoor unit PWB Compressor starts up Immediately after startup Replace expansion valve LED1 is flashing BN Replace outdoor unit PWB y YES Does LED1 indicate Replace outdoor unit DC overcurrent error PWB Chec

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