website http://www.lgservice.com e-mail http://www.lgeservice.com/techsup.html Universal System Air Conditioner SERVICE MANUAL CAUTION • BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. • ONLY FOR AUTHORIZED SERVICE PERSONNEL.
Ceiling Suspended ........................115 VI. Functional Description Ceiling Cassette Type........................118 Ceiling Duct Type ........................120 Ceiling & Floor...........................126 Outdoor Units VII. Explode View and Replacement Parts List Indoor Units ..........................139 Outdoor Units ..........................148 Panel Assembly, Front .......................152 2 Universal System Air Conditioner...
Safety Precautions Safety Precautions To prevent injury to the user or other people and property damage, the following instructions must be followed. I Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications. This symbol indicates the possibility of death or serious injury.
Page 4
• There is risk of fire or electrical • There is risk of fire or electric • There is risk of fire, failure of the shock. shock. product, or electric shock. 4 Universal System Air Conditioner...
Page 5
Safety Precautions Do not store or use flammable gas or com- If strange sounds, or small or smoke comes bustibles near the product. from product. Turn the breaker off or discon- nect the power supply cable. • There is risk of fire or failure of product. •...
Page 6
(outdoor units) the air inlet or outlet while the product is oper- ated. • There is risk of personal injury and failure of product. • There are sharp and moving parts that could cause personal injury. 6 Universal System Air Conditioner...
Introduction • Model Number Nomenclature Indoor unit A T N H 4 8 6 D L F C Serial Number Functions A : Basic B : Low Ambient C : Plasma Filter E : Elevation Grille F : Elevation Grille + Plasma Filter H : Plasma Filter + Low Ambient L : Nano Plasma M : Nano Plasma + Elevation Grille...
Ceiling Cassette 4-way 1. Features & Benefits I Convenience • Auto elevation grille(Accessory) • Tele control(Optional) • LCD wired remote control • Group control • Central control(Accessory) • Weekly progam I Cleanness • Plasma air purifying system • Hygienic and easy to clean filter I Easy Installation •...
Page 12
- It provides you ease of control. Air conditioner can be switched on/off by the telephone. It saves time & energy. In Advance by Telephone In case of Going out Before Coming Home... Without Turning off the Air Conditioner... 12 Universal System Air Conditioner...
Ceiling Cassette 4-way Child Lock Function -It prevents the children or others from tampering with the control buttons. Unit can be controlled by the wireless remote controller. This can be easily set by pressing timer key & Min key simultaneously. After child lock is set, pressing any key will display CL on the LCD for 3 seconds and all the keys will be ineffective.
Central Room.For Setting Temperature, Fan Speed and other sub functions, access the respec- tive LCD wired remote controller of each unit. ❈ Sub PI485(with wire assembly) should be pur- Controller Controller Controller chased as optional. 14 Universal System Air Conditioner...
Ceiling Cassette 4-way 2. List of Functions ATNH366DLFC ATNH426DLFC ATNH486DLFC ATNH606DLFC Category Function [UT36 NDC] [UT42 NDC] [UT48 NDC] [UT60 NDC] Air supply outlet Airflow direction control (left & right) Airflow direction control (up & down) Auto Auto Auto Auto Auto swing (left &...
- Outdoor Temperature 7°C(44.6°F) DB / 6°C(42.8°F) WB Piping Length - Interconnecting Piping Length 7.5m - Level Difference of Zero. 2. Cooling/heating capacity of indoor unit can be different when it is connected to other type outdoor. 16 Universal System Air Conditioner...
PTC HEATER INUT CN-REMO REMOTE CONTROL CN-GRILL GRILL CONTROL CN-CC CENTRAL CONTROL CN-PIPE2 DISCHARGE PIPE SENSOR CN-ROOM ROOM SENSOR CN-PIPE1 PIPE SENSOR CN-HVB AIR CLEANER CN-UD1 STEP MOTOR CN-UD2 STEP MOTOR CN-LR1 STEP MOTOR CN-LR2 STEP MOTOR 18 Universal System Air Conditioner...
Used to set the current time and clear the setting time. ❈ Display temperature can be different from actual room temperature if the remote controller is installed at the place where sun-rays are falling directly or the place nearby heat source. 20 Universal System Air Conditioner...
Page 21
Ceiling Cassette 4-way I Wireless Remote Controller (optional) This air-conditioner is equipped with wired remote controller basically. But if you want to be available with wireless remote controller, you pay for it. 1. START/STOP BUTTON Operation starts when this button is pressed and stops when the button is pressed again.
• Do not install the unit near the door way. • Keep proper distances, of the unit, from ceiling, fence, Unit:cm floor, walls and other obstacles as shown in figure. • The indoor unit must have the maintenance space. Floor 22 Universal System Air Conditioner...
Ceiling Cassette 4-way 8.2 Ceiling opening dimensions and hanging bolt location • The dimensions of the paper pattern for installation are the same as those of the ceiling opening dimensions. Ceiling Ceiling board Level gauge TE Model TF Model TD Model 600 (Ceiling opening) 790 (Ceiling opening) 875 (Ceiling opening)
[Air inlet side view] controller cord Control box cover fitting screw(2 units) Terminal Block in Indoor 1(L) 2(N) Connected to outdoor unit WARNING Make sure that the screws of the terminal are free from looseness. 24 Universal System Air Conditioner...
Ceiling Cassette 4-way 8.4 Installation of Decoration Panel Before installing the decoration panel, The decoration panel has its installation always remove the paper template. direction. 1. Temporarily fix two decoration panel fixing screws (hexagon M5 screw) on the unit body. (Tighten by amount 10mm in length.) The fixing screws (hexagon M5 screw) are included the indoor unit box.
• Vibration of a magnetic switch, damage on the contact point there of, fuse breaking, disturbance to the normal function of a overload protection device. • Proper starting power is not given to the compressor. 26 Universal System Air Conditioner...
Ceiling Cassette 4-way 9. Accessories Standard Accessories Washer for Insulation for (Other) Clamp Clamp metal Name Drain hose hanging backet fitting Quantity 1 EA 1 EA 8 EA 8 EA 1 SET • Paper pattern for installation • Owner's manual •...
Ceiling suspended 1. Features & Benefits Natural CHAOS wind • It swings at an angle, thus minimizing the difference in indoor temperatures and allowing air in every corner of the room. Auto air flow direction (up&down) Horizontal • The air flow direction can be adjusted as desired by using the remote controller.
• Option: Model name & price are different according to options, and assembled in factory with main unit. • Accessory: Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. 30 Universal System Air Conditioner...
42k, 48k, 60k Ø 9.52 Ø 19.05 VK Chassis 1350 1255 More than Anchor nut 70cm Ceiling 320mm Washer Suspension bolts Suspension bolt More than 30cm More than 70cm Suspension bolts Spring washer Hangen Max. Washer 12mm 32 Universal System Air Conditioner...
Ceiling suspended 5. Wiring Diagrams AVNH-KL AVNH-LL CONNECTOR NUMBER LOCATION CONNECTOR NUMBER LOCATION CN-POWER AC POWER SUPPLY CN-TH2 DISCHARGE PIPE SENSOR CN-MOTOR BLDC FAN MOTOR OUTPUT CN-TH1 PIPE AND ROOM SENSOR CN-D/PUMP DRAIN PUMP OUTPUT CN-HVB AIR CLEANER CN-AC/DC AC/DC CONNECTION CN-DOOR STEP MOTOR CN-DISPLAY...
Ceiling suspended 7. Operating Instructions I Remote Control Operation The Remote Controller transmits the signals to the system. 1. START/STOP BUTTON Operation starts when this button is pressed and stops when Signal transmitter the button is pressed again. 2. OPERATION MODE SELECTION BUTTON Used to select the operation mode.
Unit should be installed for horizontal discharge appli- cation only. CASE 1 POSITION OF SUSPENSION BOLT • Apply a joint-canvas between the unit and duct to absorb unnecessary vibration. (Unit:mm) 320 160 Dimension Chassis VL Chassis 1750 1655 VK Chassis 1350 1255 36 Universal System Air Conditioner...
Page 37
Ceiling suspended CASE 2 Suspension bolts • Install the unit leaning to a drainage hole side as a fig- Spring ure for easy water drainage. washer Max. 12mm Washer POSITION OF CONSOLE BOLT • A place where the unit will be leveled and that can support the weight of the unit.
6. Knock out the pipe hole from the left side-cover with side conver the help or nipper/plier. 7. Knock hole on right side-cover only if right side is selected for water drain. Knock the hole 38 Universal System Air Conditioner...
Ceiling suspended 8.4 Mounting the anchor Nut & Bolt(Ceiling Mounting) MOUNTING THE ANCHOR NUT AND BOLT • Prepare 4 suspension bolts. (Each bolts length should be same.) Anchor nut • Measure and mark the position for the Suspension Ceiling bolts and the piping hole. Washer Suspension •...
Page 40
• The inclination should be less thanr or euql to 1° or in between 10 to 20mm inclined in drain direction as shown in fig. Ceiling 10~20mm Drain hose Ceiling 10~20mm Side of view • The unit must be declined to the bottomside of the unit when finished installation. Ceiling 5~10mm 40 Universal System Air Conditioner...
Ceiling Concealed Duct 8.6 Checking the Drainage 1. Set the air direction louvers up-and-down to the posi- tion(horizontally) by hand. To check the drainage. 1. Pour a glass of water on the evaporator using a ket- tle. 2. Ensure the water flows through the drain hose of the indoor unit without any leakage and goes out the drain exit.
• Vibration of a magnetic switch, damage on the contact point there of, fuse breaking, disturbance to the normal func- tion of a overload protection device. • Proper starting power is not given to the compressor. 42 Universal System Air Conditioner...
Ceiling suspended 9. Accessories Standard Accessories Washer for Insulation for (Other) Name Clamp metal Drain hose Clamp hanging backet fitting Quantity 1 EA 1 EA 8 EA 6 EA 1 set • Owner's manual • Installation manual Shape for gas pipe for liquid pipe Optional Accessories(For Unit) Item...
Ceiling Concealed Duct 1. Features & Benefits I Easy Installation • Compact & light design • (Linear E.S.P Control) • High head drain pump(700mm, Accessory) I Comfort & Reliability • Low noise design • 2-Thermistor control(Main body & Remote control) •...
Page 46
Ceiling Concealed Duct LG’s High Technology provide Easy and Low cost Design of Duct work Generally, when External Static Pressure increases air volume decreases. But by controlling the phase of motor while installing the product E.S.P. is controlled from 8~10 mmAq linearly. E.S.P. control provides required constant air volume irrespective of ESP change.
Ceiling Concealed Duct 2. List of Functions ABNH366GLAC ABNH426RLAC ABNH486RLAC ABNH606RLAC Category Function [UB36 NGC] [UB 42 NRC] [UB48 NRC] [UB60 NRC] Air supply outlet Airflow direction control (left & right) Airflow direction control (up & down) Auto swing (left & right) Auto swing (up &...
- Outdoor Temperature 7°C(44.6°F) DB / 6°C(42.8°F) WB Piping Length - Interconnecting Piping Length 7.5m - Level Difference of Zero. 2. Cooling/heating capacity of indoor unit can be different when it is connected to other type outdoor. 48 Universal System Air Conditioner...
CN-D/PUMP DRAIN PUMP OUTPUT CN-REMO REMOTE CONTROL CN-DISP RF-REMOTE CONTROL CN-ROOM ROOM SENSOR CN-FLOAT FLOAT SWITCH INUT CN-AIRC AIR CLEAN CN-ZONE ZONE CONTROL OUTPUT CN-PTC PTC HEATER CN-CC CENTRAL CONTROL OUTPUT CN-OUT VENTILATION /ELECTRIC HEATER 50 Universal System Air Conditioner...
Slide switch for ceiling height (4) Close the rear cover and check if it works normally. CAUTION Select the position after checking duct work and E.S.P of the unit. • • Maunfactured in the position F-H. 52 Universal System Air Conditioner...
Page 53
Ceiling Concealed Duct How to Set E.S.P? Procedure of RPM change: Ex) External Static pressure is 4mmAq for Model Name "ABNH246HLAB". • To protect the unit, compressor is designed to be off during E.S.P. setting. Push the "On/Off" button. AUTO SWING OPERATION SET TEMP FAN SPEED SUB FUNCTION...
Page 54
Value other than that in table will not give the combinations of airflow & ESP which are mentioned in the table. 2. Table 7-1 is based at 230V. According to the fluctuation of voltage, air flow rate varies. 54 Universal System Air Conditioner...
Page 55
Ceiling Concealed Duct Table 7-2 Static Pressure(mmAq) Setting Model Name Step Value CMM(CFM) High 42(1483) 40(1413) 38(1342) 35.5(1254) 33.5(1183) 32(1130) ABNH366GLAC 39(1377) 37(1307) 35(1236) 33(1165) 31(1095) 29(1024) 34(1201) 32.5(1148) 31(1095) 29.5(1042) 27(954) 26.5(936) High 44.5(1572) 43.4(1533) 41(1448) 39.4(1402) 37.5(1324) 36.4(1286) ABNH426RLAC 41(1448) 40.2(1420) 37.6(1328) 35(1236) 33.8(1194) 32.7(1155)
Used to cancel the timer. ❈ Display temperature can be different from actual room temperature if the remote controller is installed at the place where sun-rays are falling directly or the place nearby heat source. 56 Universal System Air Conditioner...
Page 57
Ceiling Concealed Duct I Optional Function • Wireless Remote Controller This air-conditioner is equipped with wired remote controller basically. But if you want to have the wireless remote controller, you pay for it. 1. FAN Operation Button Signal transmitter Used to circulate room air without cooling or heat- Transmits the signals to the signal receptor.
• The place where the unit is not affected by an electrical noise. • The place where air circulation in the room will be good . • There should not be any heat source or steam near the unit. 58 Universal System Air Conditioner...
Page 59
Ceiling Concealed Duct 9.2 Ceiling dimension and hanging bolt location I Installation of Unit Install the unit above the ceiling correctly. CASE 1 POSITION OF SUSPENSION BOLT • Apply a joint-canvas between the unit and duct to absorb unnecessary vibration. •...
Page 60
4) In Australia, the length of power supply cord measured from the entry of the power supply cord to the middle of live pin on the power plug should be over 1.8m. 60 Universal System Air Conditioner...
Page 61
Ceiling Concealed Duct 9.4 Insulation THERMAL INSULATION All thermal insulation must comply with local requirement. INDOOR UNIT Union for liquid pipe Thermal insulator for refrigerant pipe (Local supply) Thermal insulator for Refrigerant pipe and thermal piping(Local supply) insulator(Local supply) Hose crip for thermal insulator (Local supply) Overlap with thermal Thermal insulator for refrigerant pipe...
Page 62
B ≥ 2C C ≥ 2 x SP SP = External Pressure (mmAq) 1/50~1/100 1/50~1/100 Ex) External Pressure U-Trap = 10mmAq Drain Pipe A ≥ 70mm B ≥ 40mm MAX 700mm C ≥ 20mm Drain Pump 62 Universal System Air Conditioner...
Ceiling Concealed Duct 10. Accessories Standard Accessories Screws for Insulation for Clamp (Other) Name Clamp metal Drain hose duct flanges fitting Quantity 1 EA 1 EA 1 set 6 EA 1 set • Owner's manual • Installation manual • Washers(8 pcs.) Shape for gas pipe for liquid pipe...
3Ø, 380-415, 50Hz AUUW488C AUUW608C • Indoor Unit Matching LG’s system consist of one outdoor unit which can match with three different indoor units as individ- ual system. The indoor units are ceiling cassette, ceiling concealed duct and ceiling & floor types.
Page 66
100 : 100,000 Btu/h 30 : 30,000 Btu/h 36 : 36,000 Btu/h 48 : 48,000 Btu/h Model Type W : Inverter Heat Pump H : Heat Pump Indicates that this is a R410A outdoor unit 66 Universal System Air Conditioner...
- Indoor Temperature 20°C(68°F) DB / 15°C(59°F) WB - Outdoor Temperature 7°C(44.6°F) DB / 6°C(42.8°F) WB Piping Length - Interconnecting Piping Length 7.5m(25ft) - Level Difference of Zero. 2. Due to our policy of innovation some specifications may be changed without notification. 68 Universal System Air Conditioner...
Inverter SINGLE A 2. Dimensional Drawings AUUW368C/ AUUW368C1 4-holes for anchor bolts (Unit: mm) Number Name Descripition Liquid side service valve(mm) Ø6.35 Gas side service valve(mm) Ø15.88 Air discharge grill Control Cover 70 Universal System Air Conditioner...
Page 71
Inverter SINGLE A AUUW42/48/608C 4-hole for anchor bolts Control cover Liquid side 3-way valve Gas side 3-way valve Model AUUW42/48/608C Dimensions 1,165 1,135 Ø9.52 Ø19.05 Service Manual 71...
Inverter SINGLE A 5. Electric Characteristics Unit Power Compressor Model Type Voltage Voltage range AUUW368C1 [UU37WE] 7.76 21.1 0.13 AUUW368C [UU37W UEC] Min : 352 380~415 inverter AUUW428C Maxi :457 9.12 26.0 0.18 [UU43W UHC] AUUW488C 10.99 29.7 0.18 [UU49W UHC] AUUW608C 11.00 35.0...
0°C, Intermittent operation due to the operation the cooling capacity can be dropped and conditions (indoor/outdoor temperature humidity, operation characteristics can be slightly and load) can cause different. the heating capacity to drop. 76 Universal System Air Conditioner...
Inverter SINGLE A 7. Installation 7.1 Select the best location • If a roof is built over the unit to prevent direct sunlight or rain exposure, make sure that heat radiation from the condenser is not restricted. • Do not place animals and plants in the path of the warm air. •...
Page 78
• Capacity is based on standard length and maximum allowance length is on the basis of reliabili- • Improper refrigerant charge may result in abnormal cycle. • Oil trap should be installed every 10 meters. 78 Universal System Air Conditioner...
Troubleshooting Guide III. Troubleshooting Guide Self-diagnosis Function .................80 Cycle Troubleshooting Guide ................81 Electronic Parts Troubleshooting Guide ............82 General Information..................87 Service Manual 79...
Troubleshooting Guide 2. Cycle Troubleshooting Guide Trouble analysis 1. Check temperature difference between intake and discharge air, and operating current. Temp. difference : approx. 0°C All amount of refrigerant leaked out. Current : less than 80% of Check refrigeration cycle. rated current Temp.
2) The output voltage of power power transfomer. transformer. 3) DC12V 3) Replace IC01D. 3) IC01D(7812) 4) DC5V 4) Replace IC02D. 4) IC02D(7805) 5) The voltage of micom pin 29 5) Replace IC01A. 5) IC01A(KIA7036) : DC4.5V↑ 82 Universal System Air Conditioner...
Page 83
Troubleshooting Guide Product doesn't operate with the remote controller. Trouble 2 Turn on main power. While the compressor has been stopped, the compressor does not operate owing to the delaying function for 3 minutes after stopped. When the compressor stopped Indoor Fan is driven by a low speed. At this point the wind speed is not controlled by the remote controller.
Page 84
DC 5V DC 0V Between IC01M(No. 11) and DC 1V↓ DC 12V Turn off main power. Check the electrical wiring diagram of Outdoor side. Check the open or short of connecting wires between Indoor and Outdoor. 84 Universal System Air Conditioner...
Page 85
Troubleshooting Guide When indoor Fan does not operate. Trouble 4 Turn off main power. Check the connection of CN-FAN. Check the Fan Motor. Check the Fuse(AC250V, T2A). Check the related circuit of indoor Fan Motor. • The pin No. of micom and the part for driving SSR.(Q01M) •...
Page 86
MICOM - Between of IC01M - Between of IC01M If there are no problems after above checks. • Confirm the assembly condition that are catching and interfering parts in the link of the vertical louver 86 Universal System Air Conditioner...
Troubleshooting Guide 4. General Information I Error Indicator (Indoor) • The function is to self-diagnosis air conditioner and express the troubles if there is any trouble. • Error mark is displayed on display window of indoor units and wired-remote controller, and LED of outdoor unit control board.
Page 88
3 times (Main micon <-> Sub micom) 5 times 25 sec DC Link Low voltage Error 6 times CT Sensor Open/Short Error A/D Option Error 7 times 8 times 25 sec Comp over current Error 88 Universal System Air Conditioner...
Page 89
Troubleshooting Guide 1) Troubleshooting CH01, CH02, CH06 Display Title Cause of error Check point & Normal condition code • Open / Short Normal resistor : 10KΩ/ at 25°C (Unplugged) Indoor air sensor • Soldered poorly Normal voltage : 2.5Vdc / at 25°C (plugged) •...
Page 90
3. Check the volt. Of main PCB power source. (DC 12V, DC 5V) ¡ Repair or Change the main PCB. 4. Check the installation of wired remote controller. (Noise interference) ¡ Adjust the state of installation 90 Universal System Air Conditioner...
Page 91
Troubleshooting Guide 3) Troubleshooting CH04 Display Title Cause of error Check point & Normal condition code • The connection of wire(Drain pump/ Float switch) • Drain pump power input. (220V) Drain pump • Float switch Open. • Drain tube installation. / Float switch (Normal : short) •...
Page 92
* CH05 is displayed at indoor unit, CH53 is displayed at outdoor unit. 6. If all indoor unit is displayed CH05 but outdoor PCB not display CH53 : Check the CN_COM and CN_POWER is correctly connected. 92 Universal System Air Conditioner...
Page 93
Troubleshooting Guide 5) Troubleshooting CH21 Display Title Cause of error Check point & Normal condition code • An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W • Instant over current DC PEAK •...
Page 94
Check the IPM (Measuring after Comp connector disconnect) 1) Test mode set diode mode( Measuring method A Measuring method B Measuring method Terminal N W V N W V 0.4~0.6V 0.4~0.6V RD(+) BK(-) 0.4~0.6V 0.4~0.6V RD(+) BK(-) 0.4~0.6V 0.4~0.6V 94 Universal System Air Conditioner...
Page 95
Troubleshooting Guide 6) Troubleshooting CH22 Display Title Cause of error Check point & Normal condition code Malfunction of compressor Blocking of pipe Max. C/T Over current Low voltage input Refrigerant, pipe length, blocked, … Check Point 1. Check the power source.(200~240V) 2.
Page 96
1. Check the Tab1 connection condition. (Refer to outdoor wiring diagram) 2. Check the CN_COIL(IN), CN_COIL(OUT) connection condition. 3. Check the DC Link voltage at not operating(260V ) 4. Check the DC Link voltage at Comp operating(500V ) 96 Universal System Air Conditioner...
Page 97
Troubleshooting Guide 8) Troubleshooting CH24, CH25 Display Title Cause of error Check point & Normal condition code • Check the connection of “CN_Press”. • Low / High press Press S/W Open • Check the components. S/W open. Check the power source. •...
Page 98
2. Check the connection condition of Comp. U,V,W wire. 3. Check the connection condition of CN_IPM(P), CN_IPM(N). 4. Check the comp resistor and insulation resistance . 5. Check the IPM. 6. Check the pressure of refrigerant. 7. Check the Service Valve Open. 98 Universal System Air Conditioner...
Page 99
Troubleshooting Guide 10) Troubleshooting CH32 Display Title Cause of error Check point & Normal condition code • Check the discharge pipe sensor for INV. • Check the install condition for over load. D-pipe (Inverter) • Discharge sensor • Check the leakage of refrigerant. temp.
Page 100
• The voltage of "C01N" Is 4.0Vdc(25A) . Figure 1. Figure 2. DC 2.5V Check Point 1. Check the input voltage.(200~240V) 2. Check the voltage of C01N at not operating.(0V) 3. Check the voltage of Figure2. red point at not operating.(2.5V) 100 Universal System Air Conditioner...
Page 101
Troubleshooting Guide 12) Troubleshooting CH41, CH44, CH45, CH46, CH47, CH65 Display Title Cause of error Check point & Normal condition code • Open / Short • Normal resistor : 200KΩ / at 25°C (Unplugged) D-pipe sensor (Inverter) • Soldered poorly •...
Page 102
Max. single indoor unit capacity AUUW368C AUUW368C1 AUUW428C AUUW488C AUUW608C Check Point • CH 60 • CH 51 1. Check the insertion condition of EEPROM. 1. Check the indoor unit capacity. 2. Check the poor soldering 102 Universal System Air Conditioner...
Page 103
Troubleshooting Guide 14) Troubleshooting CH54 Display Title Cause of error Check point & Normal condition code • 3-phase wrong wiring of • Abnormal Main PCB 3-phase wrong wiring outdoor unit (Reverse • No connection of CN_Phase of main outdoor unit Phase /omission of •...
Page 104
Down Check Point • CH 62 • CH 61 1. Check the fan is locked. 1. Check the install condition for over load. (Refrigerant, Pipe length, Blocked, …) 2. Check the sensor of heat sink. 104 Universal System Air Conditioner...
Page 105
Troubleshooting Guide 16) Troubleshooting CH67, CH105 Display Title Cause of error Check point & Normal condition code Outdoor fan • Check the fan condition. • Outdoor fan is not oper- lock • Check the fan connector ating • Communication error Communication error •...
Electronic Control Device IV. Electronic Control Device Ceiling Cacsette Type...................107 Ceiling Duct Type..................108 Celing Suspended ..................109 Outdoor Unit....................110 106 Universal System Air Conditioner...
Speed Speed Speed Swirl Swing Control Vane 2 Vane 2, 4 is almost vane closed while vane1, 3 is opened. Vane 1, 3 and vane 2,4 turn over minutely Vane 1 Vane 3 Vane 4 118 Universal System Air Conditioner...
Ceiling Cassette Type Heating Mode Operation The unit will operate according to the setting by the remote controller and the operation diagram is shown as following. Indoor unit 35°C Heat-Exchanger temperature 32°C 29°C 21°C 17°C Intake Air Temperature 3min Low fan during 10sec Setting Temperature +4°C(Unit Sensing) +2°C(Remo Sensing)
Intake Air Temperature SET TEMPERATURE +0.5°C (Thermo. ON) SET TEMPERATURE -0.5°C (Thermo. OFF) More than More than 3 minutes 3 minutes Selecting Selecting Selecting INDOOR FAN fan speed fan speed fan speed COMPRESSOR 120 Universal System Air Conditioner...
Page 121
Ceiling Duct Type Heating Mode Operation The unit will operate according to the setting by the remote controller and the operation diagram is shown as following. Indoor unit 40°C Heat-Exchanger temperature 33°C 30°C 27°C 20°C Intake Air Temperature 3min Low fan during 10sec Setting Temperature +4°C(Unit Sensing) +2°C(Remo Sensing)
Page 122
• The indoor fan does not rotate until the indoor unit Hex-Exchanger temperature reaches 27°C. • The operation diagram is as following. Indoor unit Heat-Exchanger temperature 33°C 27°C 20°C 1min 1min Compressor Outdoor fan Setting fan Setting fan Indoor fan spped spped 4way Valve 122 Universal System Air Conditioner...
Ceiling & Floor Ceiling & Floor The function of main control Soft-Dry Operation • The indoor fan speed is automatically set to the low, so the shift of the indoor fan speed is impossible because of already being set to the best speed for Dry Operation by microcontroller control. Cooling Mode Operation •...
Page 124
While the indoor Heat-Exchanger temperature is higher than 35°C, fan operates at low speed, when it becomes lower than 35°C fan stops. For eluminating latent heat-loss, fan operates at low speed for 10 seconds periodically. 124 Universal System Air Conditioner...
Page 125
Ceiling & Floor Hot-Start Control • The indoor fan does not rotate until the indoor unit Hex-Exchanger temperature reaches 21°C. • The operation diagram is as following. Indoor unit Heat-Exchanger temperature 32°C 21°C 17°C 1min Compressor Outdoor fan Setting fan Setting fan Indoor fan spped...
Step_base Long piping Comp. Step compensation by setting long piping ∆Step_TAO step compensation by TAO (Outdoor temp.) ∆Step_TAI step compensation by TAI (Indoor temp.) ∆Step_DTAI Step Compensation of temperature difference Indoor Temp. and Setting Temp. 126 Universal System Air Conditioner...
Page 127
Outdoor Units Target frequency step (Step_base) exceeds maximum step, the Step_base value follows the maximum step value. The compressor get the minimum step in case Step_base value is lower than the minimum step of operating capacity. Compressor operation range Control Capacity Inverter Compressor...
: T target > Tout - LEV pulse down : T target < Tout 4) LEV pulse change Value 8 pulse (P1-P0 > 4°C) 4 pulse (4°C ≥P1-P0 > 3°C) 2 pulse (3°C ≥P1-P0 > 1°C) 128 Universal System Air Conditioner...
Outdoor Units 1.4 Fan control Control logic of outdoor fan depends on Outdoor temperature. (1) Single fan model (2) Two fan model(36k) Step_Fan Fan (A) Fan (B) Step_Fan Fan A High High High High Outdoor Cooling Single FAN Cooling two FAN temperature Step_Fan + 2 41°C...
Outdoor Units 2. Special control 2.1 Defrost control 2.1.1 Starting to the defrosting operation 1) Defrost operation will be start when the conditions below are matched a) Accumulation time of operation and the period after completion of defrost = 35 min. b) After 10 minutes from re-starting the compressor .In case of being over 35 minutes of accumulated operating time, defrosting operation starts after 10 minutes.
2) After defrost and oil returning operation, the continuous running time is resetted. 2.3.2 Operation Process 1) EEV-Full open, Hot gas bypass valve-On 2) Compressor Step-70Hz (Option) 3) Reversing valve-Off(Process of Off/On, follows defrost operating.) 4) Outdoor Fan-Low step 132 Universal System Air Conditioner...
Page 133
Outdoor Units 2.4 Sump heating control 2.4.1 Inverter compressor sump heating fuction : A function protecting inverter compressor from damages, by increasing oil viscosity in low outdoor temperature. For the control,compressor operates in low frequencies. Operating condition :in case of the following 3 conditions are fulfilled at the same time. - Outdoor temperature, D-pipe temperature, Heat sink temperature : below 0°C, OD temp.
System will stop if this situation occurs 5 times in 1 hour and error code will be generated. D-Pipe temp Toff(105)°C T2(95)°C T1(90)°C 5 Hz 5 Hz COMP Down Down Expansion Stop control Pulse Up Pulse Up valve 134 Universal System Air Conditioner...
Page 135
Outdoor Units 3.1.2 Discharge pipe control for constant compressor 1) There can be two situations (a) Sensor is failed (error code for sensor failure will be generated) (b) Abnormal high temperature discharge temperature (error code for high discharge will be generated) Both cases unit will stop.
Page 136
And after 3 min turn on the compressor and check the current again. b) If CT2 occurs 5 times in 1 hour,stop the operation and shows Self-Diagnosis Error Mode 22 Model cooling heating CT 2 (CT 1) (CT 1) 48~60k 136 Universal System Air Conditioner...
Page 137
Outdoor Units 3.3 Inverter Protection control(2) 3.3.1 Function : Power module failure protection by checking the temperature of heat sink. There is a temperature sensor for checking the heat sink temperature. 3.3.2 Heat sink sensor failure error Short Check : if temperature ≥130°C Open Check : if temperature <...
Page 138
Exploded View & Replacement Parts List VII. Exploded View & Replacement Parts List Indoor Unit ....................139 Outdoor Unit ....................148 Panel Assembly, Front .................152 138 Universal System Air Conditioner...
Exploded View & Replacement Parts List Panel Assembly, Front PT-HDA1/C1 146811 268712 152312 135314 135802 137211 152 Universal System Air Conditioner...
Page 153
Exploded View & Replacement Parts List Parts List Part No. LOCATION DESCRIPTION CODE PT-HDA1 PT-HDC1 137211 PANEL ASSEMBLY,FRONT(INDOOR) 3721A10106X 3721A10106Z 135314 GRILLE ASSY INLET 3531A10066A 3531A10066A 152312 FILTER ASSY,AIR CLEANER 5231A10004A 5231A10004A 146811 MOTOR ASSEMBLY,STEP 4681A20055A 4681A20055A 268712 PWB(PCB) ASSEMBLY,DISPLAY 6871A20096J 6871A20096J 135802...