Samsung AQ18A6RC Service Manual
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Samsung AQ18A6RC Service Manual

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See also: Installation Instructions & Owner's Manual
SERVICE
AIR CONDITIONER
E DB81-00188A(3)

ROOM AIR CONDITIONER

INDOOR UNIT
AQ24A2RC
AQ18A6RC
Manual
OUTDOOR UNIT
UQ24A2RC
UQ18A6RC
CONTENTS

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Summary of Contents for Samsung AQ18A6RC

  • Page 1: Table Of Contents

    ROOM AIR CONDITIONER INDOOR UNIT OUTDOOR UNIT AQ24A2RC UQ24A2RC AQ18A6RC UQ18A6RC 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. Schematic Diagrams...

  • 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 ÒPump downÓ 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 pressure 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 cord 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 AssÕy Tray Drain. 1) Do Ò1Ó above. Separate the drain hose from the extension drain hose. 2) Take the display PCB out. (Center of indoor unit) 3) Loosen two fixing screws of left and right 4) Pull tray drain out from the back body. Electrical Parts 1) Do Ò1Ó, Ò2Ó, above (Main PCB)
  • Page 6 Parts Procedure Remark Fan Motor and 1) Do Ò1Ó Ò2Ó Ó3Ó Ò4Ó, 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 Cabinet 1) Turn off the unit and remove the power cable 2) Remove the top cover. 3) Remove the control box cover. 4) Unplug the ass'y cable. 5) Remove the cabi-side. 6) Remove the cabi-front. * When you assemble the parts, check if the each parts and electric connectors are fixed firmly.

  • Page 8: Troubleshooting

    3. Troubleshooting 3-1 Items to be checked first 1) The input voltage should be rating voltage 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 7 cables.

  • Page 9: Fault Diagnosis By Symptom

    3-2 Fault Diagnosis by Symptom 3-2-1 No Power(completely dead)-Initial diagnosis 1) Checklist : (1) Is input voltage normal? (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 input voltage of DC regulator IC KA7805 (IC02) normal? (11VDC-12.5VDC) (5) Is output voltage of DC regulator IC KA7805 (IC02) normal? (4.5VDC-5.5VDC) Troubleshooting procedure...
  • Page 10 3-2-2 When the Indoor Unit Fan Does Not Operate. (Initial Diagnosis) 1) 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 solder part of the PCB? 2) Troubleshooting procedure After unplugging out the power cord should...
  • Page 11 3-2-3 When the Outdoor Unit Does Not Operate. (Initial Diagnosis) 1) Checklist : (1) Is input voltage normal?(rating voltage ±10% range) (2) Is the set temperature of the remote control higher than room temperature in COOL mode? (3) Is the POWER IN connector (CN78) linked correctly? (4) Is the outdoor unit properly connected with the TERMINAL BLOCK connector(6P)? Troubleshooting procedure After unplugging out the power cord should be recon-...
  • Page 12 3-2-4 When the UP/DOWN Louver Motor Does Not Operate. (Initial Diagnosis) Checklist : (1) Is input voltage normal? (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 13 3-2-6 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 ÒNO Power partsÓ. Refer to page 3-2. Ò...
  • Page 14 3-3 Replace PCB module 3-3-1 Replace PCB module Remove power cord Replace the PCB module Check the connection and plug in Does al display lamp blink or STD lamp blink? Replace another PCB module Refer to set up the Model option...

  • Page 15: Exploded Views And Parts List

    4. Exploded Views and Parts List 4-1 Indoor Unit 13-2 13-3 13-1 10-1 10-3 10-2...
  • Page 16 Parts List QÕTY Description Specification Remark CODE NO AQ24A2RC AQ18A6RC DB64-00127A GRILLE AIR INLET HIPS DB63-30150C GUARD AIR FILTER DB74-10101C CLEANER FILTER ASS«Y ASSÕY DB61-10164B CASE-CLEANER FILTER DEODORIZING FILTER POLYESTER/CARBON DB74-10082A DB74-10081A CLEANER FILTER POLYESTER/COTTON DB63-00091A COVER TERMINAL ABS(V0) DB92-00035Q ASS«Y FRONT PANEL...
  • Page 17 4-2 Outdoor Unit 4-2-1 24K BTU 13-2 14-3 14-1 15-6 14-2 15-4 12-2 15-1 12-1 13-1 15-5 15-3 15-2 17-1 17-2 17-3...
  • Page 18 Parts List(24K) QÕTY CODE NO Description Specification Remark UQ24AZRC DB90-10634A ASSÕY WELD FRONT SC-90073T DB90-20210A ASSÕY-BASE OUT SC-90073T DB67-50074A ASSÕY-FAN AS+G/F20% DB60-20020A BOLT SPECIAL M8 L25 DB31-00027F MOTOR FAN OUT OSM-906SRC DB95-20147A ASSÕY-MOTOR B/K SGCC-M DB94-50039C PARTITION SGCC-M DB75-30102F ASSÕY-CONDENSER ASSÕY DB90-40176B COVER-CONTROL...
  • Page 19 4-2-2 18K BTU 12-3 12-4 12-2 12-1 15-4 15-1 15-6 15-3 15-2 15-7 13-1 12-5 17-1 17-2 17-3 17-4...
  • Page 20 Parts List(18K) QÕTY CODE NO Description Specification Remark UQ18A6RC DB90-00260A ASSÕY-WELD FRONT SC-90073T DB90-20210B ASSÕY-BASE OUT SC-90073T DB67-50063A ASSÕY-FAN AS+G/F20% DB60-30020A NET FLANGE M6LF DB31-10119C MOTOR FAN OUT ASS035ZTEE DB61-20008C BASE-MOTOR SGCC-M DB94-00080A PARTITION SGCC-M DB75-00058A ASSÕY-CONDENSER ASSÕY DB90-40176B COVER-CONTROL ABS(V5) DB64-60160C ASSÕY-CABI BACK...
  • Page 21 4-2-3 PCB Box Parts List Description Specification QÕTY Remark ASSÕY MAIN PCB PD-TQ24A1R-00 ASSÕY THERMISTOR 103AT 240/240 ASSÕY PCB DISPLAY ASSÕY CASE CONTROL COVER DISPLAY...

  • Page 22: Refrigerating Cycle Block Diagrams

    46~54 46~54 Cooling Max over load Low temp AQ24A2RC Standard 270~327 90~97 140~158 Heating Max over load Low temp Standard 64~78 46~54 46~54 Cooling Max over load Low temp AQ18A6RC Standard 270~327 90~97 140~158 Heating Max over load Low temp...
  • Page 23 6. PCB Diagrams 6-1 Main PCB(PD-TQ24A1R-00)
  • Page 24 Parts List Specification DESIGN LOCATION Description F701 FUSE FST 250V 3.15A FH-51H 7.5A F701,F101 HOLDER-FUSE KA7805A IC02 IC-VOLT REGU CR71 C-FILM CQS 450V 2.0µF FT71 FILTER NOISE LSAO5230P 250V~2A 23mH*2 RD 1/4 TP 221-J R104,105 R-CARBON R102,103 R-CARBON RD 1/4 TP 334-J R501,902,206,508,601,604,606 R-CARBON RD 1/8 TP 103-J...

  • Page 25: Wiring Diagrams

    7. Wiring Diagrams 7-1 Indoor Unit AQ24A2RC AQ18A6RC...
  • Page 26 7-2 Outdoor Unit UQ24A2RC DIAGRAM-OUTDOOR MARK NAME MARK NAME MAGNETIC CONTACTOR TB 1,2 TERMINAL BLOCK SOLENOID COIL CRANK CASE HEATER CAPACITOR FAN MOTOR FUSE(2A,250V~) SPARK KILLER UQ18A6RC DIAGRAM-OUTDOOR MARK NAME MARK NAME MAGNETIC CONTACTOR TB1, 2 TERMINAL BLOCK SOLENOID COIL FAN MOTOR FUSE SPARK KILLER...

  • Page 27: Schematic Diagrams

    8. Schematic Diagrams 8-1 Indoor Unit...
  • Page 28 ELECTRONICS...

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