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Service Manual

Current (A) 11 10 Conditions 220V 10 220V 9 Indoor:DB27 C/WB19 C 9 8 Outdoor:DB35 C/WB24 C 8 Indoor air flow:super High 7 Pipe length:7.5m 7 230V 6 6 5 230V 5 240V 4 4 Conditions 3 3 Indoor:DB20 C/WB15 C 2 240V 2 Outdoor:DB7 C/WB6 C Indoor air flow:super High 1 1 Pipe length:7.5m 0 0 0 10 20 30 40 50 60 70 80 90 0 10 20 30 40 50 60 70 80 90 100 110120 Compressor speed (rps) Compressor speed (rps) Current (A) 11 Capacity ratio (%) 105 110 100 95 90 100 90 85 80 75 80 70 70 65 Conditions 60 Conditions Indoor:DB27 C/WB19 C Indoor:DB20 C/WB15 C 60 Indoor air flow:super High 50 Indoor air flow:super High 55 Pipe length:7.5m Pipe length:7.5m 50 40 32 33 34 35 36 37 38 39 40 41 42 43 15 10 5 0 5 7 10 Outdoor temp.( C) Outdoor temp.( C) Capacity ratio (%)

70 Outdoor side noise 45 Indoor side noise when blowing 60 LNINV3510 Noise/dB(A) 40 35 LNINV3510 LNINV2610 Noise/dB(A) 50 40 LNINV2610 30 30 Low Middle High Supper High Indoor fan motor rotating speed 20 0 20 40 60 80 100 Compressor frequency/hz

131 542 172 43 43 Φ55 Φ55 143 80

Indoor unit Outdoor unit Gas pipe side Valve 4-Way valve Discharge Heat exchanger (evaporator) Liquid pipe side Suction Heat exchanger (condenser) Valve Strainer Capillary Strainer COOLING HEATING

ROOM TEM.SENSOR 0 0 RT1 ROOM CAP JUMP TUBE TEM.SENSOR RT2 TUBE AP2 DISP-1 DISPLAY AP1 CN1 CN2 DISP-2 AC-L L1 L1 N COM-OUT L-OUT K4 W1 BU W2 BK W3 BN W4 YEGN XT1 N(1) 2 3 BN YEGN BU BU BK BN YEGN POWER L N OUTDOOR UNIT EVAPORATOR PE PGF PG SWING-UD HEALTH-L HEALTH-N M FAN MOTOR M SWING MOTOR(U.D) RD BU COOL PLASMA GENERATOR YEGN PE

INDOOR UNIT M 4YV COMP HEAT-N1 (COMP) HEATER EH1 SAT 0 RT3 RT2 0 RT1 0 YEGN BU PE PE W3 E COMU AC-L1 N1 OVC-COMP XT1 N(1) 2 3 L1 W2 W4 W1 L1 W12 RD CN2 W9 BU N3 N2 COMP YEGN E U W V L2 L2 L2 W7 W6 W5 PE W8 COMP-U COMP-V COMP-W BU RD AP1 LX-2 LX-1 AC-L2 W11 W10 L OG WH 4V OFAN1 PE FAN BK BN BU BK BN YEGN YE TUBE TEM.SENSOR TEM.SENSOR EXHAUST OUTROOM TEM.SENSOR L3 L3 HEAT-L HEAT-N2 EH2 HEATER (CHASSIS)

11 10 9 8 7 6 13 12 14 5 4 3 2 1

6 10 7 8 9 11 4 15 5 3 1 14 12 13 2

1 ON/OFF Button 2 MODE Button 3 +/- Button 4 FAN Button 1 2 5 6 Button CLOCK Button 3 4 6 5 7 8 TIMER ON/TIMER-OFF Button X-FAN Button 8 7 10 9 12 11 9 10 11 TEMP Button TURBO Button LIGHT Button 12 SLEEP Button Operation mode Auto mode Cool mode Dry mode Fan mode Heat mode Clock Sleep mode Temp. display type :Set temp. :Indoor ambient temp. :Outdoor ambient temp. Up&down swing Set fan speed Send signal X-fan mode Set temperature Turbo mode Set time TIMER ON/TIMER OFF Child lock Light AUTO COOL DRY FAN HEAT

Auto no display (horizontal louvers stops at current position)

no display

1 3 4 2 5 Signal sender Cover of battery box Battery Reinstall Remove

Heating angle O(0 ) Cooling angle O(0 ) L1 A1 L B1 A C1 B D1 C D

Space Space to the ceiling At least 15cm Space to the wall At least 15cm Space to the wall At least 15cm Space to the obstruction At least 300cm to the floor At least 250cm Space to the wall At least 30cm Space to the obstruction At least 50cm Space to the obstruction At least 30cm At least 200cm Space to the obstruction Space to the obstruction At least 50cm Drainage pipe

Start installation Preparation before installation Read the requirements for electric connection select installation location Prepare tools Select indoor unit installation location Select outdoor unit installation location Install wall-mounting frame, drill wall holes Connect pipes of indoor unit and drainage pipe Connect wires of indoor unit Install the support of outdoor unit (select it according to the actual situation) Fix outdoor unit Install drainage joint of outdoor unit (only for cooling and heating unit) Bind up pipes and hang the indoor unit Make the bound pipes pass through the wall hole and then connect outdoor unit Connect pipes of outdoor unit Connect wires of outdoor unit Neaten the pipes Vacuum pumping and leakage detection Check after installation and test operation Finish installation Note: this flow is only for reference; please find the more detailed installation steps in this section.

Wall Space to the wall above 150mm Left Φ55 Rear piping hole Mark in the middle of it Level meter Space to the wall above 150mm Wall Right Φ55 Rear piping hole Pipe joint Union nut Pipe Torque wrench Indoor pipe Open-end wrench Union nut Pipe Insulating pipe Indoor Outdoor Φor Φ Outlet pipe Drain hose Drain hose Outlet pipe Tape Right Rear right Left Rear left Left Right Drain hose Cut off the hole Insulating pipe

Panel Screw Wiring cover Indoor unit Indoor and outdoor power cord Gas pipe Band Liquid pipe Drain hose connection wire sleeve Connection pipe Drain hose Band Indoor power cord Wiring Cover N(1) 2 3 blue black brown yellow green outdoor unit connection Fig.2 Indoor Wall pipe Outdoor Sealing gum Upper hook Lower hook of wall-mounting frame

Handle N(1) 2 3 yellowgreen blue black brown At least 3cm above the floor Foot holes Foot holes Liquid valve Liquid pipe gas pipe gas valve Drain vent Drain hose Pipe joint Union nut Chassis Outdoor drain joint handle screw U-shaped curve Drain hose Wall indoor unit connection The drain hos can't raise upwards

The drain hose can't be fluctuant The drain hose can't be fluctuant The water outlet can't be fluctuant The water outlet can't be placed in water Liquid valve Gas valve Refrigerant charging vent Nut of refrigerant Charging vent Piezometer Valve cap Inner hexagon spanner Lo Vacuum pump Hi Close Open

Trip of breaker or The breaker trips at once when it is set to ON. Measure insulation resistance to ground to see if there is any leakage. Air conditioner can not start up blow of fuse The air conditioner does not react after it is powered ( after the plug is inserted, the buzzer does not sound and the remote startup has no response) The breaker trips in few minutes when it is set to ON. No power Power plug is not well plugged in and poor connection. Fuse of controller burnt out The transformer connection is loose or has bad contact or the transformer has malfunction. The circuit or the part of the air conditioner has malfunction. They heat and break the insulation and lead to short circuit or creepage. Measure the insulation resistance or eliminate the malfunction one by one. If the breaker itself has malfunction, then replace the breaker. Check power supply circuit. Check if the plug is properly plugged in and make the loose contact firm. Change controller fuse Fasten the wiring; measure the output voltage of the transformer, if it is incorrect, change the transformer. Controller is broken Check remote controller Remote controller is short of power Change batteries The remote controller does not receive signals (after it is powered, the buzzer will sound, unless it has malfunction) Remote controller malfunction Receiver loose or poor connection Receiver is broken First, press the manual switch button AUTO,if there is no response,check based on the above methods. If it runs normally after pressing the button, check again whether the installation position and the connection wire of the reception head is correct. If it is correct,then replace the receiver or the remote controller. Power voltage is too low Check the voltage. If it is lower than 10% of the rated voltage, check the cause, improve the power supply condition and add the stabilized voltage power supply.

Improper set of temperature Adjust set temperature If cooling (heating) load is proper Check the forecasted load of cooling (heating) Malfunction of refrigerant flow The refrigerant has leakage or is insufficient Leakage between the high pressure and the low pressure inside the compressor Malfunction of four-way valve Check and fill the leakage, then vacuumize it and supplement the refrigerant as required Replace the compressor Replace the four-way valve Local block of capillary Replace the capillary Poor COOL(HEAT) operation Judge whether the system is blocked by observing the condensation of evaporator and the pressure value of the high Blockage of cooling system pressure manometer and take measures to deal with the system. Heat insulation for the connection Make sure that heat insulation for the thick and thin pipes pipes of the indoor unit and the outdoor unit is bad. is good. Heat insulation must also be provided for the joint andthe exposed part of the copper pipe. Block of outdoor heat exchanger the heat Clean the dust accumulated on the surface of exchanger. Air circulation is insufficient Air filter were blocked Fan speed was set too slow Fan rotation speed becomes low Clean the filter To set the fan speed to high or middle speed Capacitor Replace the capacitor damage Motor damage Replace the motor The installation position of the outdoor unit is not appropriate. Good ventilation must be provided for the installation position of the outdoor unit. The outdoor temperature is too high. The air tightness is not enough. People come in and out too frequently. There are heating devices indoors. Properly install the rainproof plate or the sunproof plate. If the maximum cool air still can not meet the requirement, it is suggested to replace the air conditioner. Keep certain air tightness indoors, try not to use electricalappliance with large quantity of heat

The torque of the swing motor is not enough The swing fan does not run. Wrong connection The controller is damaged(ic2003 is damaged, the swing relay can not close, etc) First, check whether the connection is wrong. If no, replace the parts In cool, heat mode, the outdoor unit and compressor will not run. Controller malfunction (IC2003 broken, creepage of parallel capacitor of relay loop, relay is broken etc.) Wire loose or wrong connection Improper setting of temperature Change controller Correctly wire according to the drawing Adjust setting temp. Water leakage Drainage pipe blocked or broken Wrap of refrigerant pipe joint is not close enough. Change drainage pipe Re-wrap and make it tight. Fan of indoor unit contacts other parts Adjust fan location Foreign object in indoor unit Take out the foreign object Abnormal sound and shake Compressor shakes too much Touch of pipeline of outdoor unit Touch of inner plates Adjust support washer of compressor, and tighten loosen screws Separate the touching pipeline. 1. Tighten connect screw. 2. Stick absorbing clay between plates. Louver of outdoor unit touched outer case. Adjust location of louver. Abnormal sound inside compressor Change compressor

Display Method of Indoor Unit Indicator Display (during Malfunction NO. Dual-8 blinking, ON 0.5s and OFF Name Code 0.5s) Display Operation Cool Heating Display Method of Outdoor Unit Indicator has 3 kinds of display status and during blinking, ON 0.5s and OFF A/C status 0.5s Yellow Red Green Indicator Indicator Indicator Indicator Indicator Indicator Possible Causes 1 High pressure protection of system E1 OFF 3s once During cooling and drying operation, except indoor fan operates, all loads stop operation. During heating operation, the complete unit stops. Possible reasons: 1. Refrigerant was superabundant; 2. Poor heat exchange (including and bad radiating environment ); Ambient temperature is too high. 2 3 4 Antifreezing protection System block or refrigerant leakage High discharge temperature protection of compressor E2 E3 E4 twice 3 times 4 times 3 times 7 times and blink 9 times During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. The Dual-8 Code Display will show E3 until the low pressure switch stop operation. During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating operation, all loads stop. 1. Poor air-return in indoor unit; 2. Fan speed is abnormal; 3. Evaporator is dirty. 1.Low-pressure protection 2.Low-pressure protection of system 3.Low-pressure protection of compressor Please refer to the malfunction analysis (discharge protection, overload). 5 Overcurrent protection E5 5 times 5 times During cooling and drying operation, compressor and outdoor fan stop while indoor fan operates. During heating operation, all loads stop. 1. Supply voltage is unstable; 2. Supply voltage is too low and load is too high; 3. Evaporator is dirty. 6 Communication Malfunction E6 6 times OFF During cooling operation, compressor stops while indoor fan motor operates. During heating operation, the complete unit stops. Refer to the corresponding malfunction analysis. 7 High temperature resistant protection E8 8 times 6 times During cooling operation: compressor will stop while indoor fan will operate. During heating operation, the complete unit stops. Refer to the malfunction analysis (overload, high temperature resistant). 8 EEPROM malfunction EE 15 times 11 times During cooling and drying operation, compressor will stop Replace outdoor control panel AP1 while indoor fan will operate; During heating operation, the complete unit will stop 9 Limit/ decrease frequency due to high temperature of module EU 6 times 6 times All loads operate normally, while operation frequency for compressor is decreased Discharging after the complete unit is de-energized for 20mins, check whether the thermal grease on IPM Module of outdoor control the radiator is inserted tightly. If its no use, please replace control panel AP1. 10 Malfunction protection of jumper cap C5 15 times Wireless remote receiver and button are effective, but can not dispose the related command 1. No jumper cap insert on mainboard. 2. Incorrect insert of jumper cap. 3. Jumper cap damaged. 4. Abnormal detecting circuit of mainboard.

NO. Malfunction Name Display Method of Indoor Unit Indicator Display (during Dual-8 blinking, ON 0.5s and OFF Code 0.5s) Display Operation Cool Heating Display Method of Outdoor Unit Indicator has 3 kinds of display status and during blinking, ON 0.5s and OFF 0.5s Yellow Red Green Indicator Indicator Indicator Indicator Indicator Indicator A/C status Possible Causes 11 Gathering refrigerant F0 1 times 1 times When the outdoor unit receive signal of Gathering refrigerant,the system will be forced to run under cooling mode for gathering refrigerant Nominal cooling mode 12 Indoor ambient temperature sensor is open/short circuited F1 once During cooling and drying operation, indoor unit operates while other loads will stop; during heating operation, the complete unit will stop operation. 1. Loosening or bad contact of indoor ambient temp. sensor and mainboard terminal. 2. Components in mainboard fell down leads short circuit. 3. Indoor ambient temp. sensor damaged.(check with sensor resistance value chart) 4. Mainboard damaged. 13 Indoor evaporator temperature sensor is open/short circuited F2 twice AC stops operation once reaches the setting temperature. Cooling, drying: internal fan motor stops operation while other loads stop operation; heating: AC stop operation 1. Loosening or bad contact of Indoor evaporator temp. sensor and mainboard terminal. 2. Components on the mainboard fall down leads short circuit. 3. Indoor evaporator temp. sensor damaged.(check temp. sensor value chart for testing) 4. Mainboard damaged. 14 15 16 17 Outdoor ambient temperature sensor is open/short circuited Outdoor condenser temperature sensor is open/short circuited Outdoor discharge temperature sensor is open/short circuited Limit/ decrease frequency due to overload F3 F4 F5 F6 3 times 4 times 5 times for 6 times and blink 6 times and blink 5 times and blink 7 times and blink 3 times During cooling and drying operating, compressor stops while indoor fan operates; During heating operation, the complete unit will stop operation During cooling and drying operation, compressor stops while indoor fan will operate; During heating operation, the complete unit will stop operation. During cooling and drying operation, compressor will sop after operating for about 3 mins, while indoor fan will operate; During heating operation, the complete unit will stop after operating for about 3 mins. All loads operate normally, while operation frequency for compressor is decreased Outdoor temperature sensor hasnt been connected well or is damaged. Please check it by referring to the resistance table for temperature sensor) Outdoor temperature sensor hasnt been connected well or is damaged. Please check it by referring to the resistance table for temperature sensor) 1.Outdoor temperature sensor hasnt been connected well or is damaged. Please check it by referring to the resistance table for temperature sensor) 2.The head of temperature sensor hasnt been inserted into the copper tube Refer to the malfunction analysis (overload, high temperature resistant) 18 Decrease frequency due to overcurrent F8 8 times and blink once All loads operate normally, while operation frequency for compressor is decreased The input supply voltage is too low; System pressure is too high and overload

NO. Malfunction Name Display Method of Outdoor Display Method of Indoor Unit Unit Indicator has 3 kinds of Indicator Display (during display status and during Dual-8 blinking, ON 0.5s and OFF blinking, ON 0.5s and OFF Code 0.5s) 0.5s Display Operation Cool Heating Yellow Red Green Indicator Indicator Indicator Indicator Indicator Indicator A/C status Possible Causes 19 Decrease frequency due to high air discharge F9 9 times and blink twice All loads operate normally, while operation frequency for compressor is decreased Overload or temperature is too high; Malfunction of electric expansion valve (EKV) 20 Limit/ decrease frequency due to antifreezing FH 2 times 2 times and blink 4 times All loads operate normally, while operation frequency for compressor is decreased Poor air-return in indoor unit or fan speed is too low 21 Voltage for DC bus-bar is too high PH 11 times and blink 13 times 1. Measure the voltage of position L and N on wiring board (XT), if the During cooling and drying voltage is higher than 265VAC, turn operation, compressor will stop on the unit after the supply voltage while indoor fan will operate; is increased to the normal range. 2.If the AC input is normal, During heating operation, the measure the voltage of electrolytic complete unit will stop capacitor C on control panel (AP1), operation. if its normal, theres malfunction for the circuit, please replace the control panel (AP1) 22 Voltage of DC bus-bar is too low PL and blink 21 times 12 times During cooling and drying operation, compressor will stop while indoor fan will operate; During heating operation, the complete unit will stop 1. Measure the voltage of position L and N on wiring board (XT), if the voltage is higher than 150VAC, turn on the unit after the supply voltage is increased to the normal range. 2.If the AC input is normal, measure the voltage of electrolytic capacitor C on control panel (AP1), if its normal, theres malfunction for the circuit, please replace the control panel (AP1) 23 Compressor Min frequence in test state P0 (during (during blinking, blinking, ON ON 0.25s 0.25s and OFF and OFF 0.25s) 0.25s) Showing during min. cooling or min. heating test 24 Compressor rated frequence in test state P1 (during (during blinking, blinking, ON ON 0.25s 0.25s and OFF and OFF 0.25s) 0.25s) Showing during nominal cooling or nominal heating test 25 Compressor maximum frequence in test state P2 (during (during blinking, blinking, ON ON 0.25s 0.25s and OFF and OFF 0.25s) 0.25s) Showing during max. cooling or max. heating test

NO. Malfunction Name Display Method of Outdoor Display Method of Indoor Unit Unit Indicator has 3 kinds of Indicator Display (during display status and during Dual-8 blinking, ON 0.5s and OFF blinking, ON 0.5s and OFF Code 0.5s) 0.5s Display Operation Cool Heating Yellow Red Green Indicator Indicator Indicator Indicator Indicator Indicator A/C status Possible Causes 26 Compressor intermediate frequence in test state P3 (during (during blinking, blinking, ON ON 0.25s 0.25s and OFF and OFF 0.25s) 0.25s) Showing during middle cooling or middle heating test 27 Overcurrent protection of phase current for compressor P5 15 times During cooling and drying Refer to the malfunction operation, compressor will stop analysis (IPM protection, loss while indoor fan will operate; of synchronism protection and During heating operation, the overcurrent protection of phase complete unit will stop current for compressor. operation. 28 Charging malfunction of capacitor PU 17 times During cooling and drying operation, compressor will stop Refer to the part three charging while indoor fan will operate; malfunction analysis of capacitor During heating operation, the complete unit will stop 29 Malfunction of module temperature sensor circuit P7 18 times During cooling and drying operation, compressor will stop while indoor fan will operate; Replace outdoor control panel AP1 During heating operation, the complete unit will stop 30 Module high temperature protection P8 19 times During cooling operation, compressor will stop while indoor fan will operate; During heating operation, the complete unit will stop After the complete unit is deenergized for 20mins, check whether the thermal grease on IPM Module of outdoor control panel radiator is inserted tightly. If its no use, please replace control panel AP1. 31 Decrease frequency due to high temperature resistant during heating operation H0 10 times All loads operate normally, while operation frequency for compressor is decreased Refer to the malfunction analysis (overload, high temperature resistant) 32 Static dedusting protection H2 twice 33 Overload protection for compressor H3 3 times 8 times During cooling and drying 1. Wiring terminal OVC-COMP operation, compressor will stop is loosened. In normal state, the while indoor fan will operate; resistance for this terminal should During heating operation, the be less than 1ohm. complete unit will stop 2.Refer to the malfunction analysis ( operation. discharge protection, overload)

NO. 34 35 Malfunction Name System is abnormal IPM protection Display Method of Outdoor Display Method of Indoor Unit Unit Indicator has 3 kinds of Indicator Display (during display status and during Dual-8 blinking, ON 0.5s and OFF blinking, ON 0.5s and OFF A/C status Possible Causes Code 0.5s) 0.5s Display Operation Cool Heating Yellow Red Green Indicator Indicator Indicator Indicator Indicator Indicator During cooling and drying operation, compressor will stop Refer to the malfunction analysis while indoor fan will operate; H4 (overload, high temperature 4 times 6 times During heating operation, the resistant) complete unit will stop operation. During cooling and drying Refer to the malfunction operation, compressor will stop analysis (IPM protection, loss while indoor fan will operate; H5 of synchronism protection and 5 times 4 times During heating operation, the overcurrent protection of phase complete unit will stop current for compressor. operation. 36 Module temperature is too high H5 5 times 10 times 37 38 39 Internal motor (fan motor) do not operate Desynchronizing of compressor PFC protection H6 H7 HC 11 times 7 times 6 times 14 times Internal fan motor, external fan motor, compressor and electric heater stop operation,guide louver stops at present location. During cooling and drying operation, compressor will stop while indoor fan will operate; During heating operation, the complete unit will stop operation. 1. Bad contact of DC motor feedback terminal. 2. Bad contact of DC motor control end. 3. Fan motor is stalling. 4. Motor malfunction. 5. Malfunction of mainboard rev detecting circuit. Refer to the malfunction analysis (IPM protection, loss of synchronism protection and overcurrent protection of phase current for compressor. During cooling and drying operation, compressor will stop while indoor fan will operate; Refer to the malfunction analysis During heating operation, the complete unit will stop operation. 40 Outdoor DC fan motor malfunction L3 23 times and blink 14 times Outdoor DC fan motor DC fan motor malfunction or malfunction lead to compressor system blocked or the connector stop operation, loosed 41 power protection L9 20 times 9 times compressor stop operation and Outdoor fan motor will stop 30s latter, 3 minutes latter fan motor and compressor will restart To protect the electronical components when detect high power 42 43 Indoor unit and outdoor unit doesn't match Failure startup LP LC 19 times 11 times 16 times compressor and Outdoor fan motor can t work Indoor unit and outdoor unit doesn't match During cooling and drying operation, compressor will stop while indoor fan will operate; Refer to the malfunction analysis During heating operation, the complete unit will stop operation.

NO. Malfunction Name Display Method of Indoor Unit Display Method of Outdoor Unit Indicator Display (during Indicator has 3 kinds of display Dual-8 blinking, ON 0.5s and OFF status and during blinking, ON Code 0.5s) 0.5s and OFF 0.5s Display Operation Cool Heating Yellow Red Green Indicator Indicator Indicator Indicator Indicator Indicator A/C status Possible Causes 53 Normal communication continously 54 Defrosting once (during blinking, twice ON 10s and OFF 0.5s) Defrosting will occur in heating mode. Compressor will operate while indoor fan will stop operation. Its the normal state

Turn on the unit and wait 1 minute Use DC voltmeter to measure the voltage on the two ends of electrolytic capacitor Voltage higher than 200V? Y Fault with the voltage testing circuit on control panel AP1 Replace the control panel AP1 N Measure the AC voltage between terminal L and N on wiring board XT(power supply) Voltage within 210VAC~250VAC? N Shut down the power and repair the power supply to restore the range 210VAC~250VAC power on and restart the unit If the fault is eliminated? Y Y Shut down the power and wait 20 minutes; or use DC voltmeter to measure the voltage on the two ends of capacitor, until the voltage is lower than 20V N Check the connection of reactor (L in the Electrical Wiring Diagram) If the wiring of reactor Lis normal? N Connect the reactor Laccording to Electrical Wiring Diagram correctly Re-energize and turn on the unit If the fault is eliminated? Y Y Replace the control panel AP1 N End

Energize and switch on IPM protection occurs after the machine has run for a period of time? Y Use AC voltmeter to measure the voltage between terminal L and N on the wiring board XT) If the voltage between terminal L and N on wiring board XT is within 210VAC~250VAC? N Check the supply voltage and restore it to 210VAC~250VAC Y Refer to the Electrical Wiring Diagram and check if the connection between AP1 and COMP is loose and if the connection order is correct. Y Please confirm: 1. If the indoor and outdoor heat exchangers are dirty? If they are obstructed by other objects which affect the heat exchange of indoor and outdoor unit. 2. If the indoor and outdoor fans are working normally? 3. If the environment temperature is too high, resulting in that the system pressure is too high and exceeds the permissible range? 4. If the charge volume of refrigerant is too much, resulting in that the system pressure is too high? 5. Other conditions resulting in that the system pressure becomes too high. Voltage between the two ends of celectrolytic capacitor is higher than 250V N Stop the unit and disconnect the power supply. Then, check the connection of capacitor C2 according to Electrical Wiring Diagram. Remove the wires on the two ends of capacitor C2. Then, use capacitance meter to measure the capacitor C2. Verify as per the Parameters Sheet. If capacitor C2 is failed? N If there is any abnormality described above? N Y Restart the unit. Before protection occurs, use DC voltmeter to measure the voltage between the two ends of electrolytic capacitor on control panel AP1 The connection of capacitor C2 is loose. Stop the unit and disconnect the power supply. Wait 20 minutes, or use DC voltmeter to measure the voltage between the two ends of capacitor C2, until the voltage is lower than 20V Replace the capacitor C2. Then, energize and start the unit. Replace the control panel AP1 Y N Take corrective actions according to Technical Service Manual, and then energize and start the unit. Replace the control panel AP1 N Y N If the unit can work normally? Reconnect the capacitor C2 according to Electrical Wiring Diagram. Then, Restart the unit. If the unit can work normallv? If the unit can work normally? N If the unit can work normally? N Y Y Y Y If the connection between AP1 and COMP is unsecure or the connection order is wrong? Y Connect the control panel AP1 and compressor COMP correctly according to the Electrical Wiring Diagram. Then, energize and start the unit. If the unit can work normally? Y Use ohmmeter to measure the resistance between the three terminals on compressor COMP, and compare the measurements with the compressor resistance on Service Manual. Use ohmmeter to measure the resistance between the two terminals of compressor COMP and copper tube. If the resistance is normal? N Resistance higher than 500MΩ? Y Replace the compressor COMP N Replace the control panel AP1 END

Overheat and high temperature protection Is outdoor ambient temperature higher than 53? Y Normal protection, please operate it after the outdoor ambient temperature is normalized. N 20 minutes after the complete unit is powered off. Is heat dissipation of the indoor unit and outdoor unit abnormal? Y Improve the heat dissipation environment of the unit N Does the outdoor fan work normally? N 1. Check if the fan terminal OFAN is connected correctly 2. Resistance between any two terminals is measure by an ohm gauge and should be less than 1K Ohm. Y Replace the control panel AP1 Replace the fan capacitor C1 Replace the outdoor fan End

Power on the unit Is stop time of the compressor longer than 3 minutes? N Restart it up after 3 minutes Y Does startup fail? Y Are the wires for the compressor connected correctly? Is connection sequence right? N Connect the wires as per the connection diagram Y Replace the control panel AP1 N If the fault is eliminated? N Replace the compressor Y End

Out of step occurs once the unit is powered on. Out of step occurs in operation Is stop time of the compressor longer than 3 minutes? Is the outdoor fan working normally? Check if the fan terminal OFAN is connected correctly Replace the fan capacitor C1 Is the outdoor unit blocked by foreign objects? Remove foreign objects Replace the outdoor fan Are the wires for the compressor connected correctly? Is connection sequence right? Is the connection made in clockwise direction? Replace the control panel AP1 Connect the wires correctly Replace the control panel AP1 If the fault is eliminated? If the fault is eliminated? Replace the compressor Replace the compressor End End

20 minutes after the complete unit is powered off Is the terminal FA for the electronic expansion valve connected correctly? Connect the wires correctly Resistances between the first four pins close to the terminal hole and the fifth pin are almost the same, less than 100 ohm. Replace the electronic expansion valve If the fault is eliminated? Replace the control panel AP1 If the fault is eliminated? Coolant leakage, refilling the coolant End

Start Check wiring of the reactor (L) of the outdoor unit and the PFC capacitor Whether there is any damage or short-circuit? Y Replace it as per the wiring diagram and reconnect the wires If the fault is eliminated? N Remove the PFC capacitor and measure resistance between the two terminals. N Is the resistance around zero? Y The capacitor is short circuited and the capacitor should be replaced Restart the unit If the fault is eliminated? Y N Disconnect the terminals for the reactor and measure the resistance between the two terminals of the reactor by an ohm gauge N Whether there is any damage or short-circuit? Y Replace the reactor Restart the unit If the fault is eliminated? Y N Replace the control panel AP1 N Y End

Start Y Did the equipment operate normally before the failure occurs? N Check the wiring of the indoor and outdoor units with reference to the wiring diagram Check wiring inside of the indoor and outdoor units Y N Is the connection right? N The AP1 voltage detection circuit is at fault Y Are wires broken? Correctly connect the corresponding wires for the indoor and outdoor units with reference to the wiring diagram N If the fault is eliminated? N Check the communication circuit of the outdoor unit If the fault is eliminated? The communication circuit is abnormal Y Replace the main board AP1 of the outdoor unit N If the fault is eliminated? Replace the main board of the indoor unit N Y Y End Y

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Steps Procedure 1.Remove the filter 1 Open the panel. panel 2 Loosen the clasp of the filter. clasp 3 Push the filter inward and then raise it to remove it. filter 2.Remove horizontal louver 1 Remove axile bush of horizontal louver. axile bush

Steps Procedure 2 Bend the horizontal louver slightly to remove it. horizontal louver 3.Remove front panel 1 Slide the rotor shaft out of the groove. Remove the front panel. rotor shaft front panel 4.Remove electric box cover 2 1 Remove the screws fixing the electric box cover 2. screw

Steps Procedure electric box cover 2 Remove the electric box cover2. 5.Remove front case 1 Open the screw cap on the front case. Remove the screws fixing the front case. screws clasps 2 Loosen the left, middle and right clasps. front case left middle right 3 Remove the front case.

Steps Procedure 6.Remove vertical louver 1 Loosen the clasps connecting vertical louver with bottom case. clasps 2 Remove the vertical louver. vertical louver 7.Remove electric box Heat exchanger thermistor 1 Disconnect the indoor pipe temperature sensor. screw 2 Remove the screw of the electric box. screws Ground Wire 3 Remove the screws at the joint of ground wire and evaporator.

Steps Procedure 4 Remove the clasp connecting electric box cover and electric box. Remove electric box cover. clasp fan motor signal wire 5 Disconnect the connecting wire of the motor. 6 Disconnect the connecting wire of the step motor. connector of step motor 7 Remove the screw fixing the display. Remove the display. Screw electric box 8 Remove the electric box.

Steps Procedure 8.Remove press plate of connecting pipe screw Pipe Clamp Auxiliary Piping 1 Remove the screw fixing the press plate of the connecting pipe. Pipe Clamp 2 Remove the press plate of the connecting pipe. 9.Remove the evaporator 1 Remove the 3 screws at the joint of the evaporator and bottom case. screws Auxiliary Piping 2 Adjust the pipe of evaporator.

Steps Procedure 3 Remove the evaporator. Heat Exchanger 10.Remove cross flow blade and motor Step Motor 1 Remove the screws fixing the step motor. Remove the step motor. 2 Remove the screws fixing the press plate of the motor. Remove the motor. Motor Press Plate Cross Flow Fan 3 Remove cross flow blade and motor. Fan Motor

Steps Procedure 4 Remove ring of bearing. Ring of Bearing O-Gasket sub-assy of Bearing 5 Remove the screws at the joint of cross flow blade and motor. Remove the motor. Cross Flow Fan Fan Motor

Steps Procedure 1.Remove big handle 1 Before disassembly. 2 Remove the connection screw fixing the big handle and then remove the handle. handle 2. Remove top cover top panel Remove connection screws connecting the top cover plate with the front panel and the right side plate, and then remove the top panel.

Steps Procedure 3.Remove grille axial flow blade and front panel Remove connection screws between the front grille and the front panel. Then remove the front grille. Remove connection screws connecting the front panel with the chassis and the motor support, and then remove the front panel. Remove the nut fixing the blade and then remove the axial flow blade. axial flow blade grille panel 4.Remove right side plate right side plate Remove connection screws connecting the right side plate with the valve support and the electric box. Then remove the right side plate. 5.Remove electric box subassembly Remove screws fixing electric box cover, and then remove the electric box cover.cut off the tieline, pull out all wiring terminals and remove all connection wires, and then separate connection wires and electric box.remove screws connecting electric box and middle isolation sheet, motor support, and then remove the electric box. electric box subassembly

Steps Procedure 6.Remove 4-way valve assy Unscrew the fastening nut of the 4-way valve assy coil and remove the coil. Wrap the 4 way Valve Assy with wet cotton and unsolder the 4 weld spots connecting the 4-way valve assy to take it out.(note: Refrigerant shouldbe discharged firstly.) Welding process should be as quickly as possible and keep wrapping cotton wet all the time. Be sure not to burn out the lead-out wire of compressor. 4-way valve assy 7.Remove motor and motor support Remove the 4 tapping screws fixing the motor. Pull out the lead-out wire and remove themotor. Remove the 2 tapping screws fixingthe motor support. Lift motor support to re-move it. motor support motor 8.Remove the isolation sheet Remove the screws fixing the isolation sheet and then remove the isolation sheet. isolation sheet

Steps Procedure 9.Remove the valves Remove the 2 screws fixing the gas valve and unsolder the welding point between the gas valve and the air-return pipe to remove the gas valve. Remove the 2 screws fixing the liquid valve and unsolder the welding joint connecting the liquid valve to the Y-type pipe to remove the liquid valve. liquid valve gas valve 10.Remove compressor Remove the foot nuts on the compressor and then remove the compressor. compressor

6HUYLFH 0DQXDO Steps Procedure 3.Remove grille right side plate and front panel Remove connection screws between the front grille and the front panel. Then remove the front grille. Remove connection screws connecting the front panel with the chassis and the motor support, and then remove the front panel. Remove connection screws connecting the right side plate with the valve support and the electric box. Then remove the right side plate. right side plate panel grille 4.Remove electric box subassembly Remove screws fixing electric box cover, and then remove the electric box cover.cut off the tieline, pull out all wiring terminals and remove all connection wires, and then separate connection wires and electric box.remove screws connecting electric box and middle isolation sheet, motor support, and then remove the electric box. electric box subassembly 5.Remove axial flow blade and Reactor Remove the nut fixing the blade and then remove the axial flow blade. Remove the screws fixing the reactor and then remove the reactor. axial flow blade Reactor,QVWDOODWLRQ DQG 0DLQWHQDQFH

Steps Procedure 6.Remove motor and motor support Remove the 4 tapping screws fixing the motor. Pull out the lead-out wire and remove themotor. Remove the 2 tapping screws fixingthe motor support. Lift motor support to re-move it. motor motor support 7.Remove 4-way valve assy Unscrew the fastening nut of the 4-way valve assy coil and remove the coil. Wrap the 4 way Valve Assy with wet cotton and unsolder the 4 weld spots connecting the 4-way valve assy to take it out.(note: Refrigerant shouldbe discharged firstly.) Welding process should be as quickly as possible and keep wrapping cotton wet all the time. Be sure not to burn out the lead-out wire of compressor. 4-way valve assy 8.Remove the isolation sheet Remove the screws fixing the isolation sheet and then remove the isolation sheet. isolation sheet

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