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12F INVERTER SERIES

1. 27 Operation CharacteristiCS anar anneer ennn ensnansnnnensnanenensnsennenennnenennnnesnnesnanenenannnennnennnanennnneennnnennnnennen 31 8 Electronic FUNCTION PE 32 8 1 AbbreviatiOn 2 ver reet ven eene ee ee e e ot O OOOO AA AA 32 9 2 Display furiction 5 nne nent etn miet 32 BS MaIN Protecton unne AR PEOR ON EE xxr ccs 33 8 4 Operation Modes and Aiden AE ak 36 9 Troubleshooting einen us e na uc esi m 52 931 Indoor Unit Error Display er e ee aaa AW ARA 52 9 2 Diagnosis and Solution re eter rr ER RR REL DERE e Fu e Re ale dean 53 1 Precaution 1 1 Safety Precaution WB To prevent injury to the user or other people and property damage the following instructions must be followed Incorrect operation due to ignoring instruction will cause harm or damage m Before service the unit be sure to read this service manual at first 1 2 Warning gt Installation Do not use defective or underrated circuit breaker Use this appliance on a dedicated circuit There is risk of fire or electric shock M For electrical work contact the dealer seller a qualified electrician or an authorized service center Do not disassemble or repair the product there is risk of fire or electric shock B Always ground the product There is risk of fire or electric shock m Install the panel and the cover of co
2. KFU 12HRFN1 QRC8W KFU 12HRDN1 QRC8GW KFU 18HRFN1 QRC8W KFU 18HRFN1 QRC8GW KFU 18HRFN1 QRDOGW KFU 24HRFN1 QRC8W KFU 24HRDN1 QRC8GW KFU 24HRFN1 QRDOGW KFU 18HRFN1 QRC8GW Am Him 163 c 65 3 2 Outdoor Unit More than 30cm gt More than 30cm ZA More than 60cm More than 200cm More than 60cm Service space 4 a 11 Air inle V Air inlet j c gt Model W D H Wi A B KOB 09HFN1 QRC8W 780 250 540 843 549 276 KOB 09HFN1 QRDOGW 780 250 540 843 549 276 KOB 12HFN1 QRC8W 780 250 540 843 549 276 KOB1 12HFN1 QRDOGW 780 250 540 843 549 276 KOC 18HFN1 QRC4W 760 285 590 823 530 290 KOC1 18HFN1 QRC8GW 760 285 590 823 530 290 KOZ 18HFN1 QRDOGW 810 310 558 874 549 325 KOF 24HFN1 QRC8W 845 320 700 908 560 335 KOF 24HFN1 QRC8GW 845 320 700 908 560 335 KOF 24HFN1 QRDOGW 845 320 700 9
3. Fmax T4FREMAX5 Fmax T4FREMAX6 Fmax T4FREMAX7 Meanwhile the maximum frequency is limited by the indoor fan speed Indoor fan speed Maximum frequency High speed turbo function No limit Silent mode Fixed at F3 If users switch on AC by remote controller the compressor will run at the Fmax frequency for 7 minutes according to the outdoor ambient temp During the 7 minutes the frequency limitation is active 7 minutes later the compressor running frequency will be controlled as below 37 T1 Ts 3 5 A 30 e 25 While the zones of A B C are corresponding to different compressor running frequency Note When T1 Ts keeps in the same temp zone for 3 minutes the compressor will run as the below rules A Increase the frequency to 3 grade higher until to B E Increase the frequency to 2 grade higher until to FREMAX F G Increase the frequency to 1 grade higher until to FREMAX H Keep the current frequency I Decrease the frequency to 1 grade lower until to F1 J Run at FI for 1h if T1 Ts 2 the compressor will stop Meanwhile the compressor running frequency is limited by the current T4 CoolT4Zone5l 50 49 CoolT4Zone4l 45 44 CoolT4Zone3l 41 40 33 CoolT4Zone2l 32 42 8 4 2 2 Outdoor fan running rules 38 Cooling T4 4 A 28 26 25 23 2
4. 1 Connect the charge hose to the charging cylinder open the 2 way valve and the 3 way valve Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure the liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 23 3 Put the charging cylinder onto the electronic scale and record the weight 4 Operate the air conditioner at the cooling mode 5 Open the valves Low side on the charge set and charge the system with liquid refrigerant 6 When the electronic scale displays the proper weight refer to the table disconnect the charge hose from the 3 way valve s service port immediately and turn off the air conditioner before disconnecting the hose 7 Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N m Be sure to check for gas leakage 6 5 Adding the refrigerant after running the system for many years z Indoor unit EN Liquid side 2 TZ Gas side Le Check valve JN Charging cylinder J Electronic scale Procedure 1 Connect the charge hose to the 3 way service port open the 2 way valve and the 3 way valve Co
5. OUTDOOR AMBIENT T4 TEMPERATURE SENSOR CT CONDENSER TEMPERATURE SENSOR YELLOW REACTOR 4 COMPRESSOR v a ye TO INDOOR UNIT POWER SUPPLY 18 6 Installation Details 6 1 Wrench torque sheet for installation Outside diameter Torque Additional tightening torque mm inch N cm N cm 6 35 VA 1500 153kgf cm 1600 163kgf cm 9 52 3 8 2500 255kgf cm 2600 265kgf cm 912 7 Vo 3500 357kgf cm 3600 367kgf cm 015 9 5 8 4500 459kgf cm 4700 479kgf cm 919 4 6500 663kgf cm 6700 683kgf cm 6 2 Connecting the cables The power cord of connect should be selected according to the following specifications sheet Nominal cross sectional area mm 0 75 Rated current of appliance gt 3 and lt 6 gt 6 and lt 10 gt 10 and lt 16 1 5 216 and x25 2 5 The cable size and the current of the fuse or switch are determined by the maximum current indicated on the nameplate which located on the side panel of the unit Please refer to the nameplate before selecting the cable fuse and switch 6 3 Pipe length and the elevation The pipe length and refrigerant amount Pipe size Standard Max Additional ES Elevation refrigerant KFU 09HRDN1 QRC8W KOB 09HFN1 QRC8W KFU 09HRDN1 QRC8GW KOB 09HFN1 QRDOGW so 09 52 KFU 12HRFN1 QRC8W KOB 12HFN1 QRC8W KFU 12HRDN1 QRC8GW KOB1 12HFN1 QRDOGW KFU 18HRFN1 QRC8W KOC 18HFN1 QRC4W KFU 24HRFN1 QRDOGW KOF 24HFN1 QRDOGW 5 10
6. Refrigerant charging Outdoor unit Y zast Indoor unit Y T UZZ2N Liquid side ZN Gas side sz Le Check valve Charging cylinder 3 Electronic scale Procedure 1 Connect the charge hose to the charging cylinder open the 2 way valve and the 3 way valve Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the weight 4 Open the valves Low side on the charge set and charge the system with liquid refrigerant If the system cannot be charge with the specified amount of refrigerant or can be charged with a little at a time approximately 150g each time operating the air conditioner in the cooling cycle however one time is not sufficient wait approximately 1 minute and then repeat the procedure 5 When the electronic scale displays the proper weight disconnect the charge hose from the 3 way valve s service port immediately If the system has been charged with liquid refrigerant while operating the air conditioner turn off the air conditioner
7. 24HRFN1 QRDOGW 202032891104 NOTE If used as MONO unit for the standby control needs the cross section area of cable connected to L 1 1 2 N must be sufficient for the maximum system current The maximum system current is equal to the sum of indoor unit and outdoor unit rated current If used as MULTI unit L 1 on the terminal block does not need to be connected OPTIONAL 1 1 Y G 1 1 SWIMG MOTORI SWIMG MOTOR2 OPTIONAL O CNA CNIOA DISPLAY BOARD TEMPERATURE SWR INDOOR WIRING DIAGRAM KFU 24HRDN1 QRC8GW SWING 202032991132 af RELAY ASSISTANT BOARD OPTIONAL ELECTRONIC DIR OR ANION GENERATOR VERTICAL SWING MOTOR CN1_COMP 2 COMP m ION Or EE 2 BLUE BLACK 5 otes This symbol indicates the element is optional actual shape shal be preval T2 OUTDOOR UNIT EE DISPLAY BOARD NOTES 1 The Functions In The Rectangle Are Available For Particular Air condition 2 If used as MONO unit for the standby control needs the cross section area of cable connected to L 1 1 2 N must be sufficient for the maximum system current The maximum system current is equal to the sum of indoor unit and outdoor unit rated current If used as MULTI unit L 1 on the terminal block does not need to be connected 5 2 Outdoor Unit KO
8. 3 way valve 2 Air purging by refrigerant NX S Outdoor unit vave N 1 Confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge set and a charging cylinder to the service port of the 3 way valve 3 Air purging Open the valves on the charging cylinder and the charge set Purge the air by loosening the flare nut on the 2 way valve approximately 45 for 3 seconds then closing it for 1 minute repeat 3 times After purging the air use a torque wrench to tighten the flare nut on the 2 way valve 4 Check the gas leakage 22 Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2 way valve approximately 45 until the gauge indicates 0 3 to 0 5 Mpa 6 Disconnect the charge set and the charging cylinder and set the 2 way and 3 way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems 7 Mount the valve stems nuts and the service port cap Be sure to use a torque wrench to tighten the service port cap to a torque 18N m Be sure to check the gas leakage 3 Adding the refrigerant if the pipe length gt 5m Outdoor unit zT wa SUA e m N HE Check valve Charging cylinder Z Electronic scale Procedure
9. 4 Rotate the fan by hand measure the voltage of pin1 5 pin 2 5 and pin 3 5 in feedback signal connector If any voltage is not positive voltage fluctuation the fan motor must has problems and need to be replaced Index2 1 Indoor AC Fan Motor Power on and set the unit running in fan mode at high fan speed After running for 15 seconds measure the voltage of pinl and pin2 If the value of the voltage is less than 100V 208 240V power supply or 50V 115V power supply the PCB must has problems and need to be replaced 57 Input Terminal b Red 1 Black 2 White White 3 oH D Black J b e i 2 Indoor or Outdoor DC Fan Motor control chip is in fan motor Power on and when the unit is in standby measure the voltage of pinl pin3 pin4 pin3 in fan motor connector If the value of the voltage is not in the range showing in below table the PCB must has problems and need to be replaced DC motor voltage input and output NO Color Signal Voltage 1 Red Vs Vm 280V 380V 2 ses Black GND OV 4 White Vee 14 17 5V 5 Yellow Vsp 0 5 6 6 Blue FG 14 17 5V 58 9 2 5 Open circuit or short circuit of temperature sensor diagnosis and solution E4 E5 F1 F2 F3 Check the connections between temperature No Correct the connections sensor and PCB Are the connections good Yes
10. PCB v v Power on Is the error extinguished Power on Is the error extinguished No No Y Y Change the indoor main PCB Change the outdoor main PCB 54 9 2 3 Zero crossing detection error diagnosis and solution E2 Check if the connections and No power supply is normal Correct the connections Turn on the unit when the power supply is good Yes Indoor main PCB is defective Replace indoor main PCB 9 2 4 Fan speed has been out of control diagnosis and solution E3 F5 Shut off the power supply and turn it on 5 seconds later Is it still displaying Ne the error code Yes Shut off the power supply The unit operates normally Find out the cause and have it solved For example check rotate the fan by hand Does it rotate properly No Yes Check the wires of fan motor Are all the No whether the fan is blocked or the bearing is broken Correct the connections connections good Yes Y If the Check whether the fan Replace the fan malfunction is motor is normal through No m still existing motor index 1 replace the j main PCB No Yes Replace the Check whether the main PCB is mai PE NOo The normal through index 2 Ser malfunction is solved Yes 55 Index 1 1 Indo
11. multi meter Table 1 Some frequently used R T data for T1 T2 T3 and T4 sensor s s s 5 aus 255 207 wes 126 s sz as 24 Table 2 Some frequently used data for 5 sensor to Ts 5 s o e o PResiance vane 1416 ee eo gt jar Resistance value KQ Temperature Spec Code 2170032300844 2170032400254 2170032800645 2170033000486 KFU O9HRDN1 QRC8 KFU 12HRFN1 QRC8 KFU 18HRFN1 QRC8 KFU 24HRFN1 QRC8 ode W W W 66 Compressor DA108X1C 23EZ DA108X1C 23EZ DA130M1C 31FZ DA150S1C 20FZ WZDK20 38G WZDK30 38G WZDK58 38G Indoor fan motor RPG20E Cx 50 Outdoor fan WZDK35 38G WZDK35 38G H WZDK35 38G H WZDK50 38G motor x X 5 67 Code 270032300888 270032400274 270032800688 270032900557 Wosk KFU 09HRDN1 QRC8 KFU 12HRDN1 QRC8 KFU 18HRFN1 QRC8 KFU 24HRDN1 QRC8 ode GW GW GW GW Compressor ASN108D22UEZ ASN108D22UEZ DA130M1C 31FZ DA150S1C 20FZ WZDK30 38G Indoor fan motor RPG20E RPG20E x RPG45C Outdoor fan WZDK36 38G W WZDK36 38G W WZDK36 38G W WZDK50 38G motor X X X X Code 2T0032800695 270032900561 KFU 18HRFN1 QRDO KFU 24HRFN1 QRDO Model GW GW Compressor DA130M1C 31FZ DA150S1C 20FZ WZDK30 38G WZDK58 38G Indoor fan moto
12. stove etc There is risk of fire or electric shock Turn the main power off when cleaning or maintaining the product There is risk of electric shock B When product is not be used for a long time disconnect the power supply plug or turn off the breaker There is risk of product damage or failure or unintended operation M care to ensure that nobody could step on or fall onto the outdoor unit This could result in personal injury and product damage CAUTION B Always check for gas refrigerant leakage after installation or repair of product Low refrigerant levels may cause failure of product B Install the drain hose to ensure that water is drained away properly A bad connection may cause water leakage B Keep level even when installing the product It can avoid vibration of water leakage m Do not install the product where the noise or hot air from the outdoor unit could damage the neighborhoods It may cause a problem for your neighbors B Use two or more people lift and transport the product B Do not install the product where it will be exposed to sea wind salt spray directly It may cause corrosion on the product Corrosion particularly on the condenser and evaporator fins could cause product malfunction or inefficient operation gt Operational M Do not expose the skin directly to cool air for long time Do not sit the draft M Do not use the product for special purposes such as preserving foods
13. will stop and the LED will display the failure 8 3 5 Inverter module protection The Inverter module has a protection function about current voltage and temperature If these protections happen the corresponding code will display on indoor unit and the unit will stop working 8 3 6 Indoor fan delayed open function When the unit starts up the louver will be active immediately and the indoor fan will open 10s later If the unit runs in heating mode the indoor fan will be also controlled by anti cold wind function 8 3 7 Compressor preheating functions Preheating permitting condition If T4 outdoor ambient temperature lt 3 C and the machine connects to power supply newly or if T4 lt 3 C and compressor has stopped for over 3 hours the compressor heating cable will work Preheating mode A weak current flow through the coil of compressor from the wiring terminal of the compressor then the compressor is heated without operation Preheating release condition If T4 gt 5 C or the compressor starts running the preheating function will stop 8 3 8 Sensor protection at open circuit and breaking disconnection When there s one temperature sensor in malfunction the air conditioner will display error code and will not stop immediately to avoid the case that the air conditioner is in urgent need For KFU 09HRDN1 QRC8GW KFU 12HRDN1 QRC8GW KFU 18HRFN1 QRC8GW 33 KFU 18HRFN1 QRDOGW KFU 24HRDN1 QRC8GW KFU 24HRF
14. works of art etc It is a consumer air conditioner not a precision refrigerant system There is risk of damage or loss of property M Do not block the inlet or outlet of air flow M Use a soft cloth to clean Do not use harsh detergents solvents etc There is risk of fire electric shock or damage to the plastic parts of the product M Do not touch the metal parts of the product when removing the air filter They are very sharp B Do not step on or put anything on the product outdoor units m Always insert the filter securely Clean the filter every two weeks or more often if necessary A dirty filter reduces the efficiency of the air conditioner and could cause product malfunction or damage M Do not insert hands or other objects through air inlet or outlet while the product is operated B Do not drink the water drained from the product m Use a firm stool or ladder when cleaning or maintaining the product Be careful and avoid personal injury m Replace the all batteries in the remote control with new ones of the same type Do not mix old and new batteries or different types of batteries There is risk of fire or explosion B Do not recharge or disassemble the batteries Do not dispose of batteries in a fire They may burn of explode m liquid from the batteries gets onto your skin or clothes wash it well with clean water Do not use the remote of the batteries have leaked 2 Function Model Names of I
15. xx 90 46 For KFU O9HRDN1 QRC8GW KFU 12HRDN1 QRC8GW models on Compressor off on 4 way valve off on Outdoor fan off XX 10s 1 05 no longer than 10m 308 xx 20 For KFU 18HRFN1 QRC8GW KFU 24HRDN1 QRC8GW models KFU I8HRFN1 QRDOGW KFU 24HRFN1 QRDOGW and on Compressor off on 4 way valve off on Outdoor fan off XX 10s 10s no longer than 10m 305 xx 20 47 8 4 3 5 Evaporator coil temperature protection 2 of TEstop Decrease TEdown Hold Resume Off Compressor stops Decrease Decrease the running frequency to the lower level Hold Keep the current frequency Resume No limitation for frequency 8 4 4 Auto mode This mode can be chosen with remote controller and the setting temperature can be changed between 17 30 C In auto mode the machine will choose cooling heating or fan only mode according to AT AT T1 Ts AT gt 1 C Cooling 1 lt AT lt 1 C Fan only Indoor fan will run at auto fan of the relevant mode The louver operates same as in relevant mode If the machine switches mode between heating and cooling the compressor will keep stopping for 15 minutes and then choose mode according to T1 Ts If the setting temperature is modified the machine will choose running function again 8 4 5 Drying
16. 08 560 335 4 Refrigerant Cycle Diagram INDOOR OUTDOOR 4 CHECK VALVE LIQUID SIDE Heating Model only 4 gt 2 WAY VALVE H T3 Condenser 1009007 temp sensor CAPILIARY TUBE H HEAT EXCHANGE EVAPORATOR HEAT T1 Room temp T4 Ambient 0 EXCHANGE sensor temp sensor CONDENSER T2 Evaporator temp sensor NEM I ni GAS SIDE 2 Y z nq NORWAY VALVE eM SWAY VALVE Accumulator Compressor T5 Discharge temp sensor gom 4 COOLING 4 HEATING 11 5 Wiring Diagram 5 1 Indoor Unit KFU 09HRDN1 QRC8W KFU 09HRDN1 QRC8GW 202032591215 NOTE If used as MONO unit for the standby control needs ti cross section area of cable connected to A 1 2 N must be sufficient for the maximum system current The maximum system current is equal to the sum of indoor unit and outdoor unit rated current If used as MULTI unit L 1 on the terminal block does not need to be connected LAN LN SWIMG MOTOR t OPTIONAL OPTIONA i Wire Contoller HEATER O 2 DISPLAY BOARD L IN AC N SEGR s EN OG WIT DR 8981 56 OUTDOOR UNIT KFU 12HRFN1 QRC8W KFU 12HRDN1 QRC8GW KFU 18HRFN1 QRC8W KFU 18HRFN1 QRC8GW KFU 18HRFN1 QRDOGW KFU 24HRFN1 QRC8W KFU
17. 2 20 19 17 While A B C means different fan speed of outdoor unit 8 4 2 3 Indoor fan running rules In cooling mode indoor fan runs all the time and the speed can be selected as high medium low auto and silent When the compressor is running the indoor fan is controlled as below Setting Fan Tt Ts Actual fan speed speed H H H G t Ee eb pee L L L D WH 39 The auto fan acts as below rules T1 Ts 6 0 5 0 4 0 2 5 1 0 4 8 4 2 4 Condenser temperature protection H H L 0 75 L H L 0 5 L H L 0 25 L L 55 C lt T3 lt 60 C the compressor frequency will decrease to the lower level until to and then runs at F1 If T3 54 C the compressor will keep running at the current frequency 3 52 the compressor will not limit the frequency and resume to the former frequency T3 gt 60 C for 5 seconds the compressor will stop until T3 lt 52 8 4 2 5 Evaporator temperature protection T2 lt 0 C the compressor will stop and restart when T2 gt 5 0 C ST2 4 C the compressor frequency will be limited and decreased to the lower level 4 C lt T2 lt 7 C the compressor will keep the current frequency T2 gt 7 C the compressor frequency will not be limited 40 8 4 3 Heating Mode 8 4 3 1 Compressor running rules The maximum operation frequency of the compressor after starting submit
18. 25 40 Indoor unit Indoor unit Outdoor unit Caution The capacity test is based on the standard length and the maximum permissive length is based on the system reliability The oil trap should be installed per 5 7 meters 20 6 4 Installation for the first time Air and moisture in the refrigerant system have undesirable effects as below Pressure in the system rises Operating current rises Cooling or heating efficiency drops Moisture in the refrigerant circuit may freeze and block tubing Water may lead to corrosion of parts in the refrigerant system Therefore the indoor units and the pipes between indoor and outdoor units must be leak tested and evacuated to remove gas and moisture from the system Gas leak check Soap water method Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit connections by a soft brush to check for leakage of the connecting points of the piping If bubbles come out the pipes have leakage 1 Air purging with vacuum pump Indoor unit Liquid side 7 Outdoor unit 7 Ve zy S Nu a way A x gt E NS L3 Close p ED al gt Gas side 3 ai Three way valve Manifold valve Close Compound meter_ P ESE E 3 le j Pressure N H P E t gauge Nr m P Hand
19. 4 Check the gas leakage Check the flare connections for gas leakage 26 5 Discharge the refrigerant Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the 2 way valve approximately 45 until the gauge indicates 0 3 to 0 5 Mpa 6 Disconnect the charge set and the charging cylinder and set the 2 way and 3 way valves to the open position Be sure to use a hexagonal wrench to operate the valve stems 7 Mount the valve stems nuts and the service port cap Be sure to use a torque wrench to tighten the service port cap to a torque 18N m Be sure to check the gas leakage 6 7 Re installation while the outdoor unit need to be repaired 1 Evacuation for whole system Indoor unit Liquid side Outdoor unit ama way wie O r3 pen UZAN Gas ER E CH k 8 1 Vacuum pump Procedure 1 Confirm that both the 2 way and 3 way valves are set to the opened position 2 Connect the vacuum pump to 3 way valve s service port 3 Evacuation for approximately one hour Confirm that the compound meter indicates 0 1Mpa 4 Close the valve Low side on the charge set turn off the vacuum pump and confirm that the gauge needle does not move approximately 5 minutes after turning off the vacuum pump 27 5 Disconnect the charge hose from the vacuum pump 28 2
20. B O9HFN1 QRC8W REACTOR AMBIENT HEAT EXCHANGER 202037391294 SENSOR SENSOR OPTIONAL OLP TEMP SENSOR DISCHARGE SENSOR E YELLOW CN100 04 LNA RED Aa OPTIONAL BLUE EEN 1 4 WAY aem aeg CN6 CN4 CN15 6 OH YIG 9 OUTDOOR rc eee P 4 2 POWER SUPPLY INDOOR UNIT SDN HEATER 1 CN3 Q L HEATER 2 OPTIONAL HEATER KOB O9HFN1 QRDOGW 202037391377 HOSSJHdNOJ REACTOR R8525L HEAT EXCHANGER A oe INDOOR UNIT POWER SUPPLY KOB 12HFN1 QRC8W KOC 18HFN1 QRC4W 202037391220 eine TEMP SENSOR i i a ee CE KFR26W BP3 PFC 120 D 13 MP 2 foo JO Om is used in OPTIONAL it 2 1 OUTDOOR WIRING DIAGRAM KOB1 12HFN1 QRDOGW KOZ 18HFN1 QRDOGW KOC1 18HFN1 QRC8GW OPTIONAL amarasi 1 EXPANSIVE VALVE DISCHARGE SENSOR AMBIENT SENSOR WHITE HEAT EXCHANGER SENSOR OPTIONAL BLACK OLP TEMP SENSOR 202037391376 NOTE Four way valve is used in the eme KOF 24HFN1 QRC8W KOF 24HFN1 QRDOGW KOF 24HFN1 QRC8GW 202038090849 ELECTRONIC EXPANSIVE
21. B will detect the voltage of power supply and adjust the compressor running frequency to protect the 50 system In the first 10 seconds after power on this protection is inactive When this protection happens it will last 3 minutes and then the PCB will detect the power supply voltage again 51 9 Troubleshooting 9 1 Indoor Unit Error Display Operation lamp Display LED STATUS x Indoor unit EEPROM parameter error RTT Indoor outdoor units communication error Zero crossing signal detection error only for m 3 times MS12FU 09HRDN1 QRC8W MS12FU 09HRDN1 QRC8GW MS12FU 12HRDN1 QRC8GW MS12F 24HRDN1 QRC8GW a ba Indoor fan speed has been out of control Open circuit or short circuit of indoor room temperature T1 5 times sensor Open circuit or short circuit of evaporator coil temperature 6 times T2 sensor 7 times Refrigerant Leakage Detection Open circuit or short circuit of outdoor ambient T4 2 times temperature sensor Open circuit or short circuit of condenser coil temperature m 3 times F2 T3 sensor Open circuit or short circuit of compressor discharge T5 m 4 times F3 temperature sensor me Fo ermes e eo pu nme High temperature protection of compressor top diagnosis and solution Only for KFU 24HRFN1 QRC8W 3 times KFU 24HRFN1 QRDOGW and KFU 24HRDN1 QRC8GW models yw 5 times w Inverter compressor drive
22. Check the resistance value of the sensor via tablet Yes Replace indoor or outdoor POB and table 2 is it normal No Replace the sensor check if the problem happen again 59 9 2 6 Refrigerant Leakage Detection diagnosis and solution EC Shut off the power supply and turn it on 5 seconds later Is it still displaying the error code Yes Check if T2 sensor is well Is there cool air blowing ER fixed Correct the installation out from indoor air outlet or replace T2 sensor Does the problem remain again ne Yes i i Is there any leakage Especially Replace indoor PCB the connection parts such as the gas valve and the liquid valve Yes No Repair the leakage and gt p l recharge the refrigerant Is there any block ing Such as the capillary or the welded points of the pipes Yes Y Clear the blocking 60 9 2 7 IPM malfunction or IGBT over strong current protection diagnosis and solution P0 Cort connection y Yes gt replace the wires and error and if the wires and connectors connectors are broken No Correct the installation Check if the IPM installed correctly No gt tighten the screws and apply silicon grease Yes Y IPM continuity check Check if the Replace the IPM board or replace IPM
23. K AIS A INSTRUKCJA OBS UGI urz dze klimatyzacyjnych KAISAI 12F INVERTER SERIES Service Manual 2013 12FSI A 1310 GY LA CONTENTS 1 Precautlon ect eee teet dein az EA wu Dec daan Jock elei LUE Ls ad sad ace aces a ee 3 Erie sarai nine 3 1 2 Warning nnee nea a e ty ee einen a da aea aepo etas 3 zx giai a PARE Roi EP DD IN 7 RSS 8 Sol Indoor nit e RR Rt tok Rt e e id ie aval he 8 3 2 Outdoor RN m m T ater 10 4 Refrigerant Cycle Diagram anar e eare a aaa asa 11 5 Wining EPEN tected 12 Indoor UA scs eec EEEE a BAZA NAK 12 5 2 QOUtdo r ea a a ne 15 6 Installation Details c E ennn na 19 6 1 Wrench torque sheet for installation neen eenereenneenenseneeneeeeneenenneeveneeeenneenensnervenn 19 6 2 Gonnecing Ine CABIES WAP bebe LL en 19 6 3 and the elevatione oet tee tee eee t ee eret e va S evt e eese ges 20 6 4 Installatiori for the first time E ee ee d e e aad ets 21 6 5 Adding the refrigerant after running the system for many years 24 6 6 Re installation while the indoor unit need to be 25 6 7 Re installation while the outdoor unit need to be
24. N1 QRDOGW models Fault temp Operation in cooling Operation in heating mode sensor drying and fan only mode T1 Run supposed T1226 C Run supposed T1226 C medium fan speed high fan speed T2 Normal During the first 1 minute of compressor operation indoor fan shuts off After that indoor fan runs at medium fan speed for 1 minute and then resume to the setting fan speed TS Run with compressor 3 minutes defrosting every 40 minutes when 4 lt 7 2 frequency X 14 minutes defrosting every 90 minutes when T427 C T4 Run supposed T4 50 C Run supposed 4 15 TP Run supposed T4 50 C Run supposed T4 15 C For other models Fault temp Operation in cooling drying Operation in heating mode sensor and fan only mode T1 Run supposed T1226 C high Run supposed T1226 C medium fan speed fan speed T2 Refer to table 1 Refer to table 2 Run with compressor 3 minutes defrosting every 40 minutes when T4 7 C frequency X F14 2 minutes defrosting every 90 minutes when T427 C T4 Run supposed T4 50 C Run supposed 4 15 TP Run supposed T4 50 C Run supposed 4 15 1 Tt v lt 12 20 a 25 18 23 lt F12 Indoor fan 1 minute lt F4 30 minutes on 3 off 1 minute medium fan minutes off speed then the setting fan speed table 1 KE 8 4 9 Refrigerant leakage detection This function is only active in cooling mode It can better prevent the compress
25. arts up and keeps running mark the minimum value of from the 109 minutes to 15 minutes as T30 DIf the compressor cumulate running time is up to 29 minutes and T3 lt TCDII T30SUBT3ONE 130 2 If the compressor cumulate running time is up to 35 minutes and T3 TCDD T30SUBT3TWO 130 3 If the compressor cumulate running time is up to 29 minutes and T3 lt TCDI3 for 3 minutes 4 If the compressor cumulate running time is up to 120 minutes and T3 lt 15 C Condition of ending defrosting If any one of the following items is satisfied the defrosting will finish and the machine will turn to normal heating mode T3 rises to be higher than TCDEI T3 keeps to be higher than TCDE2 C for 80 seconds The machine has run for 10 minutes in defrosting mode 45 Defrosting action For KFU O9HRDN1 QRC8W KFU 12HRFN1 QRC8W models Frequency FrequencyF 16 on Compressor off on 4 way valve off on Outdoor fan off on Indoor fan off 10s Indoor fan breeze 10s XX 10s no longer than 10m 308 xx 60 For KFU 18HRFN1 QRC8W KFU 24HRFN1 QRC8W mocels Frequency F3 Frequency F16 on Compressor off on 4 way valve off on Outdoor fan off on Indoor fan off 10s Indoor fan breeze 10s XX no longer than 10m 305
26. before disconnecting the hose 6 Mounted the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N m 29 Be sure to check for gas leakage 30 7 Operation Characteristics For the models with low temperature cooling system Temperature j Cooling operation Heating operation Drying operation Mode Room temperature gt 17 s30 C gt 10 C 0 50 15 C 50 C Outdoor temperature 15 C 30 C 0 C 50 C CAUTION 1 If the air conditioner is used beyond the above conditions certain safety protection features may come into operation and cause the unit to operate abnormally 2 The room relative humidity should be less than 80 If the air conditioner operates beyond this figure the surface of the air conditioner may attract condensation Please set the vertical air flow louver to its maximum angle vertically to the floor and set HIGH fan mode 3 The optimum performance will be achieved during this operating temperature zone 31 8 Electronic function 8 1 Abbreviation 1 2 T3 T4 5 Indoor room temperature Coil temperature of evaporator Coil temperature of condenser Outdoor ambient temperature Compressor discharge temperature 8 2 Display function 8 2 1 Icon explanation on indoor display board Signal receiver ION indication lamp optional function This lamp illuminates when C
27. er uses timer off function in sleep mode or sleep function in timer off mode if the timing is less than 7 hours sleep function will be cancelled when reaching the setting time If the timing is more than 7 hours the machine will not stop until reaches the setting time in sleep mode 8 4 9 Auto Restart function The indoor unit is equipped with auto restart function which is carried out through an auto restart module In case of a sudden power failure the module memorizes the setting conditions before the power failure The unit will resume the previous operation setting not including swing function automatically after 3 minutes when power returns If the memorization condition is forced cooling mode the unit will run in cooling mode for 30 minutes and turn to auto mode as 24 setting temp If AC is off before power off and AC is required to start up now the compressor will have 1 minute delay when power on Other conditions the compressor will have 3 minutes delay when restarts 8 4 10 8 C Heating optional In heating operation the preset temperature of the air conditioner can be as lower as 8 C which keeps the room temperature steady at 8 C and prevents household things freezing when the house is unoccupied for a long time in severe cold weather 8 4 11 Frequency limitation protection VOLT RST1 ADD VOLT LIM1 ADD VOLT RST2 ADD VOLT LIM FREQ1 ADD VOLT LIM2 ADD VOLT LIM FREQ2 ADD The PC
28. error O light X off flash 52 9 2 Diagnosis and Solution 9 2 1 EEPROM parameter error diagnosis and solution E0 Shut off the power supply and turn it on 5 seconds later Is it still displaying the error code Yes If the EEPROM chip is welded on main PCB replace the main PCB directly Otherwise check No Correct the connection whether the EEPROM chip plugged in main PCB well Yes Replace the indoor main PCB EEPROM a read only memory whose contents can be erased and reprogrammed using a pulsed voltage 53 9 2 2 Indoor unit and outdoor unit communication protection error diagnosis and solution E1 Power off then turn on the unit 5 seconds later reconnect the power wire ls the error still displaying after several minutes Yes Check all the wirings between indoor and outdoor indoor main PCB and outdoor main PCB following the wiring diagram Are all the wirings connected correctly Yes Measure Vs is it moving alternately between positive value and negative value No Vs is the voltage between S and N of outdoor unit Yes v Is the wiring to the indoor main PCB connected correctly v Is the wiring to the outdoor main PCB connected correctly Yes Yes Y Change the outdoor main PCB Change the indoor main
29. he machine will turn on automatically when reaching the setting time 8 4 7 3 Timer off The machine will turn off automatically when reaching the setting time 8 4 7 4 Timer on off The machine will turn on automatically when reaching the setting on time and then turn off automatically when reaching the setting off time 8 4 7 5 Timer off on The machine will turn off automatically when reaching the setting off time and then turn on automatically when reaching the setting on time 8 4 7 6 The timer function will not change the AC current operation mode Suppose AC is off now it will not start up firstly after setting the timer off function And when reaching the setting time the timer LED will be off and the AC running mode has not been changed 8 4 7 7 The setting time is relative time 49 8 4 8 Sleep function mode 8 4 8 1 Operation time in sleep mode is 7 hours After 7 hours AC quits this mode and turns off 8 4 8 2 Operation process in sleep mode is as follow When cooling the setting temperature rises IC be lower than 30 C every one hour 2 hours later the setting temperature stops rising and indoor fan is fixed as low speed When heating the setting temperature decreases 1 C be higher than 17 C every one hour 2 hours later the setting temperature stops rising and indoor fan is fixed as low speed Anti cold wind function has the priority 8 4 8 3 Timer setting is available 8 4 8 4 When us
30. il to FREMAX F G Increase the frequency to 1 grade higher until to FREMAX H Keep the current frequency I Decrease the frequency to the 1 grade lower until to F1 J Run at F1 for lh if TI Ts AT gt 6 the compressor will stop Meanwhile the compressor running frequency is limited by the current 42 HeatT4Zone4l 15 14 i HeatT4Zone3l 9 0 HeatT4Zone2l 6 0 HeatT4Zone1l 8 4 3 2 Outdoor fan running rules Heating A 14 t 21 E 19 18 16 15 13 12 10 A In heating mode indoor fan can be selected as high medium low auto and silent The anti cold wind function is preferential The running rules of anti cold wind function depend on both T1 and T2 that is more comfortable control 8 4 3 3 Indoor fan running rules When the compressor is running the indoor fan is controlled as below 43 fee HHS mn H H H G 7 n l If the compressor stops caused by the room temperature rising the indoor fan will be forced to run 127 seconds with breeze During this period the anti cold wind is disabled Auto fan action in heating mode T1 Ts F v 0 0 1 0 s H L 0 2 L p H L 0 44L i H L 0 6 L e H L 0 6 L 50 H L 0 6 6 0 H L 0 8 L 6 5 H 44 8 4 3 4 Defrosting mode Condition of defrosting If any one of the following items is satisfied AC will enter the defrosting mode After the compressor st
31. ir flow system of indoor and outdoor units are obstructed No Turn off the power supply and turn it on 10 minutes later Yes Check if the unit can start normally Yes Check if the refrigerant charge volume is normal Yes v Refrigerant system is blocked such as capillary or welded point of pipes Yes Clear up the air inlet and outlet or the heat exchanger of indoor and outdoor units No Check if all the connection especially the connection of OLP Over Load No Correct the connection Protector sensor is good Yes Y Measure the resistance between the two ports of No Replace the OLP the OLP Is it zero Yes Replace the outdoor control PCB Recharge the correct refrigerant volume 63 9 2 11 Inverter compressor drive error diagnosis and solution P4 aan Corect connection o Compre y Yes gt replace the wires and error and if the wires and connectors connectors are broken No Correct the installation Check if the IPM installed correctly No gt tighten the screws and apply silicon grease Yes Y IPM continuity check Check if the Replace the IPM board or replace IPM terminal resistance values are No the main if the IPM board and uniform mai
32. le Lo Handle Hi Y ues Charge hose Charge hose A gf pump c U KL S Vacuum J C TE Vacuum pump 1 Completely tighten the flare nuts of the indoor and outdoor units confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge hose with the push pin of handle lo to the 3 way valves gas service port 3 Connect the charge hose of handle hi connection to the vacuum pump 4 Fully open the handle Lo of the manifold valve 21 5 Operate the vacuum pump to evacuate 6 Make evacuation for 30 minutes and check whether the compound meter indicates 0 1 Mpa If the meter does not indicate 0 1 after pumping 30 minutes it should be pumped 20 minutes more If the pressure can t achieve 0 1Mpa after pumping 50 minutes please check if there are some leakage points Fully close the handle Lo valve of manifold valve and stop the operation of the vacuum pump Confirm that the gauge needle does not move approximately 5 minutes after turning off the vacuum pump 7 Turn the flare nut of the 3 way valves about 45 counterclockwise for 6 or 7seconds after the gas coming out then tighten the flare nut again Make sure the pressure display in the pressure indicator is a little higher than the atmosphere pressure Then remove the charge hose from 3 way valve 8 Fully open the 2 way valve and 3 way valve and securely tighten the cap of the
33. lean Air feature is activated DEFROST indication lamp For cooling amp heating models only Lights up when the air conditioner starts defrosting automatically or when the warm air control feature is activated in heating operation OPERATION indication lamp This lamp illuminates when the air conditioner is in operation TIMER indication lamp Lights up during Timer operation imi 1 jm 0 lt Temperature indicator Displays the temperature settings when the air conditioner is operational Displays the malfunction code 32 8 3 Main Protection 831 Time delay at restart for compressor 1 minute delay for the 1 time start up and 3 minutes delay for others 8 3 2 Temperature protection of compressor top The unit will stop working when the compressor top temp protector cut off and will restart after the compressor top temp protector restart 8 3 3 Temperature protection of compressor discharge When the compressor discharge temp is getting higher the running frequency will be limited as below rules Compressor discharge temp T5 gt 115 C for 5s compressor stops and restarts up till 5 lt 90 110 lt T5 lt 115 C decrease the frequency to the lower level every 2 minutes 105 lt T5 lt 110 C keep running at the current frequency T5 105 no limit for frequency 8 3 4 Fan Speed is out of control When Indoor Fan Speed keeps too low 300RPM for certain time the unit
34. mode 8 4 5 1 Indoor fan speed is fixed at breeze and can t be changed The louver angle is same as in cooling mode 8 4 5 2 Compressor running rules 48 F1 8 4 5 3 Low indoor room temperature protection In drying mode if room temperature is lower than 10 C the compressor will stop and not resume until room temperature exceeds 12 C 8 4 5 4 Evaporator anti freezing protection condenser high temperature protection and outdoor unit frequency limit are active and the same as that in cooling mode 8 4 5 5 The outdoor fan operates the same as in cooling mode 8 4 6 Forced operation function 8 4 6 1 Enter forced operation function When the machine is off pressing the touch button will carry the machine to forced auto mode If pressing the button once again within 5 seconds the machine will turn into forced cooling mode In forced auto forced cooling or any other operation mode pressing touch button will turn off the machine 8 4 6 2 In forced operation mode all general protections and remote control are available 8 4 6 3 Operation rules Forced cooling mode The compressor runs at F2 frequency and indoor fan runs as breeze After running for 30 minutes the machine will turn to auto mode as 24 setting temperature Forced auto mode The action of forced auto mode is the same as normal auto mode with 24 C setting temperature 8 4 7 Timer function 8 4 7 1 Timing range is 24 hours 8 4 7 2 Timer on T
35. n PCB are integrated together Yes Check if the outdoor fan runs Refer to the solution of fan speed has been out of control PE 5 d No malfunction Find out the cause and have it solved Yes Check if the compressor resistance No Replace the compressor values are uniform Yes Y Replace the outdoor main PCB if the main PCB and IPM are separate 64 Safety Electricity power is still kept in capacitors even the power supply is shut off Do not forget to discharge the electricity power in capacitor Electrolytic Capacitors HIGH VOLTAGE CAUTION Connect discharge resistance 1000 40W or soldering iron plug between terminals of the electrolytic capacitor on the contrary side of the outdoor PCB Discharging position Discharging period 10 seconds or more Plug of 1 soldering iron A Note picture above is only for reference The plug of your side may be different Main parts check 1 Temperature sensor checking Disconnect the temperature sensor from PCB measure the resistance value with a tester T Tester 65 0 N Q Temperature Sensors Room temp T1 sensor Indoor coil temp T2 sensor Outdoor coil temp T3 sensor Outdoor ambient temp T4 sensor Compressor discharge temp T5 sensor Measure the resistance value of each winding by using the
36. ndoor Outdoor Units Capacity Indoor units Outdoor units KFU O9HRDN1 QRC8W KOB 09HFN1 QRC8W i KFU 09HRDN1 QRC8GW KOB 09HFN1 QRDOGW KFU 12HRFN1 QRC8W KOB 12HFN1 QRC8W MUN KFU 12HRDN1 QRC8GW KOB1 12HFN1 QRDOGW KFU 18HRFN1 QRC8W KOC 18HFN1 QRC4W 18k KFU 18HRFN1 QRC8GW KOC1 18HFN1 QRC8GW KFU 18HRFN1 QRDOGW KOZ 18HFN1 QRDOGW KFU 24HRFN1 QRC8W KOF 24HFN1 QRC8W 24k KFU 24HRDN1 QRC8GW KOF 24HFN1 QRC8GW KFU 24HRFN1 QRDOGW KOF 24HFN1 QRDOGW Filter 2 ways of drainage O Killer Of Formaldehyde lonizer O Louver Position Memory Function Silver Ico Filter O Refrigerant Leakage Detect Vitamin Filter O Self diag Function 3M HAM Filter O Hydrophilic Aluminum Fin Bio Filter O Anti rust Cabinet Golden Fin O Valve Protection Cover 1W Standby O PTC Heating Belt O O optional function 7 Compressor Crankcase Heater O 3 Dimension 3 1 Indoor Unit COLL JG
37. nnect the charge hose to the valve at the bottom of the cylinder If the refrigerant is R410A make the cylinder bottom up to ensure liquid charge 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air be careful of the liquid refrigerant 3 Put the charging cylinder onto the electronic scale and record the weight 4 Operate the air conditioner at the cooling mode 5 Open the valves Low side on the charge set and charge the system with liquid refrigerant 24 6 When the electronic scale displays the proper weight refer to the gauge and the pressure of the low side disconnect the charge hose from the 3 way valve s service port immediately and turn off the air conditioner before disconnecting the hose 7 Mount the valve stem caps and the service port Use torque wrench to tighten the service port cap to a torque of 18N m Be sure to check for gas leakage 6 6 Re installation while the indoor unit need to be repaired 1 Collecting the refrigerant into the outdoor unit R Noe Indoor unit yn DN Liquid side A H N 7 C way se ESA me V C 25 Close Procedure 1 Confirm that both the 2 way and 3 way valves are set to the opened position Remove the valve stem caps and confirm that the valve stems are in the opened position Be sure t
38. not touch operation the product with wet hands M Do not place a heater or other appliance near the power cable There is risk of fire and electric shock M _ Do not allow water to run into electrical parts It may cause fire failure of the product or electric shock B Do not store or use flammable gas or combustible near the product There is risk of fire or failure of product M Do not use the product in a tightly closed space for a long time Oxygen deficiency could occur When flammable gas leaks turn off the gas and open a window for ventilation before turn the product on m If strange sounds or smoke comes from product turn the breaker off or disconnect the power supply cable There is risk of electric shock or fire m Stop operation and close the window in storm or hurricane If possible remove the product from the window before the hurricane arrives There is risk of property damage failure of product or electric shock 4 B Do not open the inlet grill of the product during operation Do not touch electrostatic filter if the unit is so equipped There is risk of physical injury electric shock or product failure B When product is soaked contact an authorized service center There is risk of fire or electric shock M Be caution that water could not enter the product There is risk of fire electric shock or product damage B Ventilate the product from time to time when operating it together with a
39. ntrol box securely There is risk of fire of electric shock m Always install a dedicated circuit and breaker Improper wiring or installation may cause fore or electric shock m Use the correctly rated breaker of fuse There is risk of fire or electric shock B Do not modify or extend the power cable There is risk of fire or electric shock B Donot install remove or reinstall the unit by yourself customer There is risk of fire electric shock explosion or injury B Be caution when unpacking and installing the product Sharp edges could cause injury be especially careful of the case edges and the fins on the condenser and evaporator For installation always contact the dealer or an authorized service center B Do not install the product on a defective installation stand sure the installation area does not deteriorate with age If the base collapses the air conditioner could fall with it causing property damage product failure and personal injury M Do not let the air conditioner run for long time when the humidity is very high and a door or a window is left open M Take care to ensure that power cable could not be pulled out or damaged during operation There is risk of fire or electric shock m Donot place anything on the power cable There is risk of fire or electric shock B _ Do not plug or unplug the power supply plug during operation There is risk of fire or electric shock M _ Do
40. o use a hexagonal wrench to operate the valve stems 2 Connect the charge hose with the push pin of handle lo to the 3 way valves gas service port 3 Air purging of the charge hose Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and then close it quickly 4 Set the 2 way valve to the close position 25 5 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0 1 6 Set the 3 way valve to the closed position immediately Do this quickly so that the gauge ends up indicating 0 3 to 0 5Mpa Disconnect the charge set and tighten the 2 way and 3 way valve s stem nuts Use a torque wrench to tighten the 3 way valves service port cap to a torque of 18N m Be sure to check for gas leakage 2 purging by the refrigerant Indoor unit Y NN Liquid side Charging cylinder Procedure 1 Confirm that both the 2 way and 3 way valves are set to the closed position 2 Connect the charge set and a charging cylinder to the service port of the 3 way valve Leave the valve on the charging cylinder closed 3 Air purging Open the valves on the charging cylinder and the charge set Purge the air by loosening the flare nut on the 2 way valve approximately 45 for 3 seconds then closing it for 1 minute repeat 3 times After purging the air use a torque wrench to tighten the flare nut on the 2 way valve
41. or AC Fan Motor Measure the resistance value of each winding by using the tester Red b Input Terminal N Red 1 2 gt White White 3 LV VV 2 Outdoor or indoor DC Fan Motor control chip is in fan motor Measure the resistance value of each winding by using the tester If any resistance value is zero the fan motor must have problems and need to be replaced N LLL 1 3456 3 Outdoor or indoor DC Fan Motor control chip is in on PCB For WZDK36 38G W WZDK40 38G W 1 UW 1 Release the UVW connector Measure the resistance of U V U W V W If the resistance is not equal to each other the fan motor must has problems and need to be replaced Otherwise go to step 2 56 For other motors Feedback 1 5 5 5 NO 1 2 3 4 5 Color Orange Grey White Pink Black Signal Hu Hv Hw Vee GND Color Red Blue Yellow Signal W V U 2 Release the UVW connector Measure the resistance of U V U W V W If the resistance is not equal to each other the fan motor must has problems and need to be replaced Otherwise go to step 2 3 Power on and when the unit is in standby measure the voltage of pin4 5 in feedback signal connector If the value is not 5V change the PCB Otherwise go to step 3
42. or being damaged by refrigerant leakage or compressor overload Open condition Define the evaporator coil temp T2 of the compressor just starts running as Tcool In the beginning 5 minutes after the compressor starts up if 2 lt Tcool 2 C does not keep continuous 4 34 seconds and this situation happens 3 times the display area will show EC and AC will turn off 8 4 10 Zero crossing detection error protection only for KFU 09HRDN1 QRC8W KFU 09HRDN1 QRC8GW KFU 12HRDN1 QRC8GW KFU 24HRDN1 QRC8GW If AC detects time interval is not correct for continuous 240s the unit will stop and the LED will display the failure The correct zero crossing signal time interval should be between 6 13ms 35 8 4 Operation Modes and Functions 8 4 1 Fan mode 1 Outdoor fan and compressor stop 2 Temperature setting function is disabled and no setting temperature is displayed 3 Indoor fan can be set to high med low auto 4 The louver operates same as in cooling mode 5 Auto fan T1 24 6 0 i Fi 5 a H L 0 75 L 455 b H L O 5 L 5 H L 0 25 L n 1 0 A 36 8 4 2 Cooling Mode 8 4 2 1 Compressor running rules The maximum operation frequency of compressor after starting submits to following rule T4 50 49 45 44 41 40 33 32 30 29 22 20 m Fmax T4FREMAX1 Fmax T4FREMAX2 Fmax T4FREMAX3 Fmax T4FREMAX4
43. r X CX Outdoor fan WZDK40 38G W 1 WZDK50 38G motor Xx Note The motor marked means DC fan motor with control chip in the PCB while the one marked sx means DC fan motor with control chip in the fan motor 2 Compressor checking Measure the resistance value of each winding by using the tester Blue Red Blue Black Red Blue Input Terminal Blue 4 Red 2 Black 3 110 2079 Blue Resistance Value 1 770 2079 68 DA108X1C 23EZ DA130M1C 31FZ DA150S1C 20FZ ASN108D22UEZ 1 50 20 C 3 IPM continuity check Turn off the power let the large capacity electrolytic capacitors discharge completely and dismount the IPM Use a digital tester to measure the resistance between P and UVWN UVW and N Digital tester Normal resistance value Red Black N Several Digital tester Normal resistance value Black U co V N Several MQ W 4 Indoor AC Fan Motor Measure the resistance value of each winding by using the tester Input Terminal anes N Red 1 Black 2 gt White White 3 l Position Resistance Value Black Red 4300 8 20 C 1680 8 20 C White Black 3700 8 20 C 1410 8 20 C 69
44. s to the following rule T4 t 4 34 Off 33 28 Fmax T4FREHEATMAXI 27 25 Fmax T4FREHEATMAX2 24 A Fmax T4FREHEATMAX3 18 Fmax T4FREHEATMAX4 1 Fmax T4FREHEATMAX5 Fmax T4FREHEATMAX6 Fmax T4FREHEATMAX7 Fmax T4FREHEATMAX8 Fmax T4FREHEATMAX9 0 Fmax F21 3 4 Fmax F22 7 8 Fmax F23 11 12 Fmax F24 Y 15 16 Fmax F25 41 Meanwhile the maximum frequency 15 limited by the indoor fan speed Indoor fan speed Maximum frequency High speed 8 degree heating turbo function No limit Medium speed FHeatMaxMidFan Low speed sleep mode FHeatMaxLowFan Silent mode Fixed at F3 If users switch AC by remote controller the compressor will run at the Fmax frequency for 7 minutes according to outdoor ambient temp During the 7 minutes the frequency limitation is active 7 minutes later the compressor running frequency will be controlled as below 1 4 i 45 0 J B LJ A CUN 2 0 D PONE ae 0 5 A While the zones of A B C are corresponding to different compressor running frequency AT 0 C as default Note When T1 Ts keeps in the same temp zone for 3 minutes the compressor will run as the below rules A Increase the frequency to 3 grade higher until to FREMAX B E Increase the frequency to 2 grade higher unt
45. terminal resistance values are No the main if the IPM board and uniform main PCB are integrated together Yes Checkitthe outdoor fan june Refer to the solution of fan speed has been out of control o malfunction Find out the cause and have it solved Yes Check if the compressor resistance values are uniform Yes Replace the compressor Replace the outdoor main PCB if the main PCB and IPM are separate 61 9 2 9 Over voltage or too low voltage protection diagnosis and solution P1 Check if the power supply is No normal Yes Check if all the connections No and wires are good Yes Power on and when the unit is in standby check if the voltage between P and N is around 310V or 340V or 380V For different kinds of units the voltage differs No Disconnect the unit with power supply and try to restart the unit when power supply gets normal Correct the connections or replace the wires Consult with technical engineer to get definite value Then start up the unit measure the voltage between P and N Is it in 220V 400V Yes Y Replace outdoor mainl PCB Replace the IPM board if it is separate with main PCB 62 9 2 10 High temperature protection of compressor top diagnosis and solution P2 Check if the a

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