Service manual Precaution Safety Precaution 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. Before service unit, be sure to read this service manual at first. Warning Installation There is risk of fire or electric shock.
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Service manual There is risk of electric shock. consumer air conditioner, not a precision refrigerant When the product is not be used for a long time, system. There is risk of damage or loss of property. disconnect the power supply plug or turn off the breaker.
Service manual Function Indoor unit Operation ON/OFF by remote controller Sensing by room temperature Room temperature sensor. Pipe temperature sensor. Room temperature control Maintain the room temperature in accordance with the setting temperature. Anti-freezing control in cooling (160v-253v) Work voltage Prevent the water being freezed on evaporator by sensing the evaporator pipe temperature in cooling mode High efficiency (30%)
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Service manual Outdoor unit Power relay control The unit has 3 mins delay between continuously ON/OFF operations. Low noise air flow system Bird tail propeller fan makes the outdoor unit run more quietly. Hydrophilic aluminum fin The hydrophilic fin can improve the heating efficiency at operation mode. 4 way valve control It is only operated in the heating operation mode except defrosting operation.
Service manual Operation limits Cooling operation Outdoor unit air temp.℃ DB Indoor air temp. ℃ DB Note: The chart is the result from the continuous operation under constant air temperature conditions. However, excludes the initial pull-down stage. Heating operation Outdoor unit air temp.℃ DB Indoor air temp.
Service manual Schematic diagram and Wiring diagram 7.1. Schematic diagram 7.1.1 Display board 9012 LED1 LED2 LED3 DISP2 74HC164 8LED DEF R DATA TIME Y DIGI FROM INDOOR PCB AUTO G REMOTE 47u/16V 9012 R1 102 9013 R4 221 REC1 dig.1 DISP1 d dp e...
Service manual Installation details Wrench torque sheet for installation Outside diameter Torque inch Kg.m φ6.35 φ9.52 φ12.7 φ15.88 φ19.05 Connecting the cables The power cord of connect should be selected according to the following specifications sheet. Grade Unit Pipe length and the elevation Standard Max.
Service manual Air purging of the piping and indoor unit Required tools: Hexagonal wrench; adjustable wrench; torque wrenches, wrench to hold the joints and gas leak detector. Note: The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration piping, it will affect the compressor, reduce the cooling capacity, and could lead to a malfunction of unit.
Service manual Pumping down (Re-installation) 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 to use a hexagonal wrench to operate the valve stems. 2.
Service manual Re-air purging (Re-installation) 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.
Service manual Balance refrigerant of the 2-way, 3-way valves Procedure: 1. Confirm that both the 2-way and 3-way valves are set to the open position. 2. Connect the charge set to the 3-way valve’s service port. Leave the valve on the charge set closed. Connect the charge hose with the push pin to the service port.
Service manual Evacuation Procedure: 1. Connect the vacuum pump to the charge set’s centre hose. 2. Evacuation for approximately one hour. Confirm that the gauge needle has moved toward -0.1 Mpa (-76 cmHg) [vacuum of 4 mmHg or less]. 3. 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).
Service manual Gas charging Procedure: 1. Connect the charge hose to the charging cylinder. Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the cylinder. 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).
Service manual 11. Electronic function 11.1. Display board 11.1.1. AUTO indicator This indicator illuminates when the air conditioner is in AUTO operation. 11.1.2. TIMER indicator This indicator illuminates when TIMER is set ON/OFF. 11.1.3. PRE.-DEF. Indicator (For Cooling & Heating models only) This indicator illuminates when the air conditioner starts defrosting automatically or when the warm air control feature is activated in heating mode.
Service manual 11.4.3 Auto fan at cooling mode: Condition Indoor fan speed T=Indoor Temp.-Setting Temp. Room temp. up T<1.5℃ 1.5℃<T<4℃ Mid. T>4℃ High Room temp. down T> 3℃ High 1℃<T<3℃ Mid. T<1℃ 11.4.4 Anti-freezing control to indoor evaporator at cooling mode( T: evaporator temp. ) Evaporator Temp.
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Service manual Condition Compressor Outdoor fan Room temp. up T> Ts+3 T<Ts+3 Room temp. down T< Ts+2 T>Ts+2 11.6.4. Indoor Fan actions at heating mode Indoor Fan can be set at HIGH/MID/LOW/AUTO by using a remote controller, but Anti-cold wind function prevails.
Service manual 11.7. Defrosting operation 11.7.1 Defrosting condition: 11.7.1.1. When outdoor temp. is more than 0℃, Defrosting starts when meeting one of the following conditions, a. The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more than 40 minutes, and the temperature remains consecutively -4°c for more than 3 minutes, b.
Service manual 11.9. Automatic operation mode The air conditioner automatically selects one of the following operation modes: cooling, heating or fan only according to the temp. difference between room temp. (TA) and set temp. (TS). TA—TS Operation mode TA—TS>2℃ Cooling -1℃≤TA-TS≤+2℃...
Service manual Troubleshooting 13.1 Indoor Unit Error Display Display LED STATUS EEPROM error Indoor / outdoor units communication protection Zero-crossing examination error Fan speed beyond control Open or short circuit of outdoor temperature sensor Room temperature or evaporator temperature sensor open or short circuit of Module protection Over voltage or too low voltage protection Compressor top protection against temperature...
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Service manual Disconnect the power supply, after 1 minutes, connect the power supply , turn on the unit using remote controller, does the unit work normally ? Is the connection on outdoor control board and between indoor and outdoor unit good? Does the L、 Does the led on outdoor control board bright? N connect good? Does the S wire connect reliably? Is the voltage on terminal CZ1 and CZ2 of the outdoor main PCB is 5V?
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Service manual Is connector connection good? Is voltage being applied to the fan motor? (rang 90v-160v between mid pin and N on CN1 Repair the connector. Indoor fan motor is defective Indoor PCB is defective Replace indoor fan motor. Replace indoor main PCB. 13.1.5 Display LED STATUS...
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Service manual Is connection to connector good? Repair connector Is the wires to compressor right? Check the voltage between P and N on inverter module. Is it about 380V? Test the outdoor power supply board again. Check the inverter module, If some component cracked or damaged? Inverter module damaged, replace it.
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Service manual Does compressor operate? Is the connection good? Is refrigerant circulation volume normal? Connect and test again. Is protector normal? Gas charging Replace protector Is abnormality the same after gas charging Check the outdoor main PCB Check refrigerant system (such as clogging of Replace the outdoor main PCB.
Service manual Reconnecting Replace outdoor main PCB If the problem can not be solved, replace inverter module If the problem comes to again, check wingding resistance of inverter compressor, is it 0.64 ohm? Replace inverter compressor 13.2 Diagnostic chart After energizing, no indicator is lighted and the air conditioner can’t be operated.
Service manual 13.3 Resetting phenomenon often occurs during operation (That is automatically entering to the status when power is on.) The reason is that the instantaneous voltage of main chip is less than 4.5V. Check according to the following procedure: 13.4 Operation lamp flashes and Timer lamp off Is connector connection good? Repair the connector.
Service manual 13.6 Operation lamp off and Timer lamp flashes 13.7 Operation lamp on and Timer lamp flashes EEROM error, indoor PCB is defective. 13.8 Operation lamp flashes, Timer lamp flashes This is alarm signal when the main chip can’t detect over-zero signal. When such failure occurs, the main control board must have fault.