Page 1: Table Of Contents
ROOM AIR CONDITIONER INDOOR UNIT OUTDOOR UNIT AS12A2VC US12A2VC AS09A2VA US09A2VA AS07A2VA US07A2VA SERVICE Manual AIR CONDITIONER CONTENTS 1. Installation 2. Disassembly and Reassembly 3. Troubleshooting 4. Exploded Views and Parts List 5. Refrigerating Cycle Block Diagrams 6. Wiring Diagrams 7.
Page 2: Installation
1. Installation 1-1 Refrigerant Refill Procedure Refill an air-conditioner with refrigerant when refrigerant has been leaked at installing or using 1. Purge air(for new installation only). 2. Turn the 3-way valve clockwise to close, connect the pressure gauge(low pressure side) to the service valve, and open the 3-way valve again.
Page 3 1-2 “Pump down” Procedure Pump down' shall be carried out when an evaporator is replaced or when the unit is relocated in another area. 1. Remove the caps from the 2-way valve and the 3-way valve. 2 Turn the 3-way valve clockwise to close and connect a pres- sure gauge(low pressure side) to the service valve, and open the 3-way valve again.
Page 4: Disassembly And Reassembly
2. Disassembly and Reassembly Stop operation of the air conditioner and remove the power cable before repairing the unit. 2-1 Indoor Unit Parts Procedure Remark Front Grille 1) Stop the air conditioner operation and block the main power. 2) Seperate tape of front panel upper. 3) Contract the second finger to the left, and right handle and pull to open the inlet grille.
Page 5 Parts Procedure Remark Ass’y Tray Drain. 1) Do “1”, above. Separate the drain hose from the extension drain hose. 2) Take the display PCB out. (Center of indoor unit) 3) Loosen three fixing screws of left and right 4) Pull tray drain out from the back body. Electrical Parts 1) Do “1”, “2”, above (Main PCB)
Page 6 Parts Procedure Remark Fan Motor and 1) Do “1” “2” ”3” “4”, above. Cross Fan 2) Loosen the fixing three screws and separate the motor holder. 3) Loosen the fixing screw of fan motor. (By use of M3 wrench) 4) Separate the fan motor from the fan. 5) Separate the fan from the left holder bearing.
Page 7 2-2 Outdoor Unit Parts Procedure Remark Common Work 1) Loosen the fixing screw and separate the cover E-parts. 2) Separate the connection wire from the terminal block. 3) Loosen three fixing screws and separate the upper cabinet. 4) Loosen the two fixing screws of Ass'y E-part. 5) Loosen seven fixing screws and separate the side cabinet.
Page 8 Parts Procedure Remark 4) Remove the nut flange (Turn to the right to remove, as it is a left hand screw) 5) Separate the fan. 6) Loosen four fixing screws to separate the motor. Heat Exchanger 1) Do “1”, above. 2) Loosen three fixing screws of left and right side.
Page 9: Troubleshooting
3. Troubleshooting 3-1 Items to be checked first 1) Is the voltage of the power correct? The input voltage shall be the rating vlotage ±10% range. The airconditioner may not operate properly if the voltage is out of this range. 2) Is the link cable linking the indoor unit and the outdoor unit linked properly? The indoor unit and the outdoor unit shall be linked by 5 cables.
Page 10: Fault Diagnosis By Symptom
3-2 Fault Diagnosis by Symptom 3-2-1 No Power(completely dead)-Initial diagnosis Checklist : (1) Is input voltage normal? (the rating voltage ±10% range.) (2) Is AC power linked correctly? (3) Are connections between primary side, secondary side of the power transformer and PCB good. (4) Is output voltage of DC regulator IC KA7812 (IC01) normal? (11VDC-12.5VDC) (5) Is output voltage of DC regulator IC KA7805 (IC02) normal? (4.5VDC-5.5VDC) Troubleshooting procedure...
Page 11 3-2-2 When the Indoor Unit Fan Does Not Operate. (Initial Diagnosis) Checklist : (1) Is the indoor unit fan motor properly connected with the connector (CN73)? (2) Is the AC voltage correct? (3) Is HALL IC in indoor fan motor properly connected with the connector (CN43)? (4) Is the running capacitor properly connected with the terminal? Troubleshooting procedure After unplugging out the power cord should...
Page 12 3-2-3 When the Outdoor Unit Does Not Operate. (Initial Diagnosis) Checklist : (1) Is input voltage normal?(the rating voltage ±10% range) (2) Is the set temperature of the remote control higher than room temperature in COOL mode? (3) Is the set temperature of the remote control lower than room temperature in HEAT mode? (4) Is the POWER IN connector (terminal-tab) linked correctly? (5) Is the outdoor unit properly connected with the TERMINAL BLOCK connector(5P)? Troubleshooting procedure...
Page 13 3-2-4 When the UP/DOWN Louver Motor Does Not Operate. (Initial Diagnosis) Checklist : (1) Is input voltage normal? (the rating voltage ±10% range) (2) Is the UP/DOWN louver motor properly connected with the connector (CN61)? Troubleshooting procedure Remove power cord and plug in again in approx. 5 seconds. Is operating lamp blinking? Check as in the procedure "No Power parts".
Page 14 3-2-5 If Operation By Remote Control Unit Is Impossible. (Initial Diagnosis) 1) Troubleshooting procedure Remove power cord and plug in again approx. 5 Seconds Is operation lamp blinking? Check as in the procedure “NO Power parts”. Refer to page 5-2. “...
Page 15: Exploded Views And Parts List
4. Exploded Views and Parts List 4-1 Indoor Unit...
Page 16 Parts List Q’TY Description Specification CODE NO Remark AS12A2VC AS09A2VA AS07A2VA DB64-10140A GRILLE AIR INLET DB64-70073A PANEL CENTER DISPLAY DB63-30131A GUARD AIR FILTER DB74-10091A ASS´Y FILTER CLEANER/CARBON DB63-10472B COVER TERMINAL HIPS DB92-70075E ASS´Y FRONT PANEL ASS´Y DB93-10560C ASS´Y PCB DISPLAY ASS´Y...
Page 17 4-2 Outdoor Unit 25-1...
Page 18: Parts List
Parts List Q’TY Description Specification CODE NO Remark US12A2VC US09A2VA US07A2VA DB63-00104A GUARD FAN DB60-30004A NUT FLANGE 2C SM20C M6 NTR DB67-50063A PROPELLER-FAN AS+G/F Ø405 DB31-10058C MOTOR FAN OUT AMASS020WTVA DB31-10058G ” AMASS020ZREA DB90-00032X ASS´Y FRAME ASS´Y DB90-00032Y ” ASS´Y DB94-00032X ASS´Y PARTITION ASS´Y...
Page 19 4-3 PCB Box Parts List Q’TY CODE NO Description Specification Remark AS12A2VC AS09A2VA AS07A2VA DB61-10151A CASE-CONTROL DB93-10612A Ass'y main PCB DB93-10614A Ass'y main PCB DB93-10611A Ass'y main PCB DE26-20154A Trans-power AC230V DC17V 300mA DE26-20166A Trans-Power AC125V DC17V 300mA 2306-000294 C-film...
Page 20: Refrigerating Cycle Block Diagrams
5. Refrigerating Cycle Block Diagram INDOOR UNIT OUTDOOR UNIT Capillary tube 2-way valve Liquid side Heat Heat exchanger exchanger (Evaporator) (Condenser) Gas side 3-way valve Cooling Compressor Gas leak check point Refrigerating cycle temperature and pressure STD Pressure Piping Temp(°F) Use Temp.
Page 21: Wiring Diagrams
6. Wiring Diagrams 6-1 Indoor Unit • AS12A2VC • AS09A2VA, AS07A2VA...
Page 22 6-2 Outdoor Unit...
Page 23: Schematic Diagrams
7. Schematic Diagrams 7-1 Indoor Unit AS12A2VC...
Page 24 AS09A2VA/AS07A2VA...
Page 25 ELECTRONICS...

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