Samsung MC18AC2-09 Service Manual Download Page 1

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SERVICE

Manual

ROOM AIR CONDITIONER

INDOOR UNIT

MC18AC2-09
MC19AC2-07
MC19AC2-12
MC24AC2-12

OUTDOOR UNIT

MC18AC2X

MC19AC2X

MC24AC2X

CONTENTS

AIR CONDITIONER

1. Precautions

2. Product Specifications

3. Operating Instructions and

Installation

4. Disassembly and Reassembly

5. Troubleshooting

6. Exploded Views and Parts List

7. Block Diagrams

8. PCB Diagrams

9. Wiring Diagrams

10. Schematic Diagrams

DB98_06187A(2)_cover 2/19/03 2:51 PM Page 3

Summary of Contents for MC18AC2-09

Page 1: ...UTDOOR UNIT MC18AC2X MC19AC2X MC24AC2X CONTENTS AIR CONDITIONER 1 Precautions 2 Product Specifications 3 Operating Instructions and Installation 4 Disassembly and Reassembly 5 Troubleshooting 6 Exploded Views and Parts List 7 Block Diagrams 8 PCB Diagrams 9 Wiring Diagrams 10 Schematic Diagrams ...

Page 2: ...on cord and avoid tap ping into a power cord This practice may result in malfunction or fire 6 After completing repairs and reassembly check the insulation resistance Procedure Prior to applying power measure the resistance between the power cord and the ground terminal The resistance must be greater than 30 megaohms 7 Make sure that the grounds are adequate 8 Make sure that the installation condi...

Page 3: ...MEMO Samsung Electronics 1 2 ...

Page 4: ...eller 30 2Row 24Step A 280 B 280 A RAC12131 9622 B RAC12131 9622 2 05 6 995 1 763 0 9 6 39 830 3 7 3 15 790x245x165 31 1x9 64x6 50 7 7 ø6 35x5 ø9 52x5 ø18 0x2 Resin Cross flw 22 2Row 12Step 3 5 11 942 3 009 1 5 8 42 1 170 5 1 3 15 790x245x165 31 1x9 64x6 50 7 7 ø6 35x5 ø9 52x5 ø18 0x2 Resin Cross flow 22 2Row 12Step 5 55 18 937 4 772 55 2 000 8 8 880x638x310 34 65x25 1x12 2 60 Rotary A G4A080JU1EP...

Page 5: ...245 165 790 Air in Front view Remote control Air out Installation plate 22 45 115 Samsung Electronics 2 2 2 2 Dimensions 2 2 1 Indoor Unit Unit mm ...

Page 6: ...2 3 Samsung Electronics Product Specifications Unit mm 2 2 2 Outdoor Unit Front view Rear view 660 880 340 638 310 MC18AC2X MC19AC2X Unit mm Front view Rear view 660 1000 340 798 310 MC24AC2X ...

Page 7: ... Pressure kg cm 2 G 40 30 6 22 5 27 19 21 5 14 6 MC19AC2 07 10 9 8 7 3 20 30 Outdoor drybulb temperature deg C Low Pressure kg cm 2 G 40 30 6 22 5 27 19 21 5 14 6 MC18AC2 09 10 9 8 7 3 20 30 Outdoor drybulb temperature deg C Low Pressure kg cm 2 G 40 30 6 22 5 27 19 21 5 14 6 MC19AC2 12 MC24AC2 12 ...

Page 8: ... automatically after a period of six hours The Off Timer enables you to switch off the air conditioner automatically after a given period of time that is from 30 minutes to 24 hours To cancel the Off Time press the Set Cancel button The ON Timer enables you to switch on the air conditioner automatically after a given period of time that is from 30 minutes to 24 hours To cancel the On Time press th...

Page 9: ...e But if you pressed the TURBO button in DRY or FAN mode that is changed with AUTO mode automatically 5 SLEEP MODE Sleep mode is available only in COOL mode The operation will stop after 6 hours The setting temperature is automatically raised by 1 C each 1hour When the temperature has been raised by total of 2 C that temperature is maintained 6 FAN SPEED Manual 3 step Auto 4 step Fan speed automat...

Page 10: ...e air conditioner is turned ON at a specified time using OFF TIMER The air Conditioner is turned OFF at a specified time using ON TIMER Only timer LED lights on OFF TIMER Both timer and operation LED lights on 10 SELF Diagnosis 11 BUZZER SOUND Whenever the ON OFF button is pressed or whenever change occurs to the condition which is set up or select the compulsory operation mode buzzer is sounded b...

Page 11: ... light Install a separate sunblind if exposed to direct sun light 2 Make sure that you install the outdoor unit in area allowing good air moment not amplifying noise or vibration especially to avoid disturbing neighbors Fix the unit firmly if it is mounted in a high place 3 Make sure that you install the outdoor unit in area providing good ventilation and which is not dusty It must not be blocked ...

Page 12: ...A Indoor unit gas leak test check point Tape vinyl Piping Indoor unit B Drain hose installation Cut the piping hole sloped slightly Piping Liquid 1 4 Clamper tube Piping Gas 3 8 Installation plate Installation tube Pipe connection Vinyl tape Screw Putty Drain hose Piping may be laid to the rear left right or down Right Rear Down Rear Left 3 1 1 2 3 4 5 6 7 8 9 10 2 Remote control 125mm or more 125...

Page 13: ...ot project by more than 20mm 4 Determine the positions of the wooden uprights to be attached to the window frame 5 Attach the wooden uprights to the window frame in a manner appropriate to the weight of the indoor unit 6 Using tapped screws attach the installation plate to the wooden uprights as illustrated in the last figure opposite On delivery the indoor unit is loaded with an inert gas All thi...

Page 14: ...he assem bly cable into the outdoor unit refer to page 3 8 3 2 2 d Installing and Connecting the Indoor Unit Drain Hose Care must be taken when installing the drain hose for the indoor unit to ensure that any conden sation water is correctly drained outside When passing the drain hose through the 65mm hole drilled in the wall check that none of the following situations occur To install the drain h...

Page 15: ...ected to the outdoor unit The assembly cable connecting the indoor unit to the outdoor unit The power cable connecting the auxiliary circuit breaker to the outdoor unit 1 Remove the terminal board cover on the side of the outdoor unit 2 Connect the assembly cable to terminals 1 to 5 and connect the power cable to terminals A to B Each wire is labelled with the corresponding terminal number Ensure ...

Page 16: ...a grounding electrode Specifications of grounding electrode 1 When an existing grounding terminal is avilable Grounding wire of ø1 6mm or larger solid wire or 2mm2 or larger standard wire Terminal used exclusively for grounding Carbon plastic Steel core PVC insulated wire 2mm2 x3 5m green Terminal M4 Grounding resistance less than 100 ohms existing grounding electrode Grounding screw hole ...

Page 17: ...t please recheck that pressure is staloilization Close the valve of the low pressure side of manifold gauge clockwise Remove the hose of the low pressure side of manifold gauge 7 Check for gas leakage 6 At this time especially check for gas leakage from the 3 way valve s stem nuts and from the service port cap 5 Set valve cork of both liquid side and gas side of packed valve to the open position 2...

Page 18: ... Low pressure checking mode Press the ON OFF switch for 5 second All lamps blink on the indoor unit 7 Stop operation of the air conditioner 9 Close the cap of each valve 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 5 Check the pressure indicated by the pressure gauge low pressure side Refer to Low pressur...

Page 19: ...as Side 160 300 500 200 350 550 Fixing Torque Final Torque Torque kg cm Connection Pipe Length 5m Max 5 10m Air Purge Method Refer to the detailed Air Purge Procedure Refrigerant Adjustment Unnecessary Add 10g of refrigerant R410A Add as liquid state for every 1m Air Purge Method Purge air using a vacuum pump Refrigerant Quantity refer to specification sheet Add 10g of refrigerant R410A Add as liq...

Page 20: ...ed to the outdoor unit At this time cover the valve of the outdoor unit and the other pipe using a cap or vinyl plug to avoid foreign material entering 6 Make sure you do not bend the connection pipes in the middle and store together with the cables 7 Move the indoor and outdoor units to a new location 8 Remove the mounting plate for the indoor unit and move it to a new location 2 Way Valve 3 Way ...

Page 21: ...MEMO Samsung Electronics 3 14 ...

Page 22: ...er 3 Contract the second finger to the left and right handle and pull to open the inlet grille 4 Take the left and right filter out 5 Loosen one of the right fixing screw and separate the terminal cover 6 Loosen three fixing screws of front grille 7 Pull the upper left and right of discharge softly for the outside cover to be pulled out 8 Pull softly the lower part of discharge and push it up Caut...

Page 23: ...in hose from the extension drain hose 2 Pull tray drain out from the back body 1 Do 1 and 2 3 above 2 Loosen two fixing earth screws of right side 3 Separate the connection pipe 4 Separate the holder pipe at the rear side 5 Loosen the three fixing screws of right and left side 6 Lifting the heat exchanger up a little to push the up side for separation from the indoor unit 1 Do 1 2 3 4 above 2 Loos...

Page 24: ...ove 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 1 Do Procedure 1 above 2 Remove the nut flange Turn to the right to remove as it is a left turned screw 3 Disassemble the propeller fan MC18AC2X MC19AC2X MC24C2X MC18AC2X MC19AC2X MC24AC2X ...

Page 25: ...MEMO Samsung Electronics 4 4 ...

Page 26: ...mpressor stops intermittently in a COOL mode or DRY mode and fan speed of the indoor unit decreases It indicates power is on The LED stops blinking if the operation ON OFF button on the remote control unit is pushed In happens after a delay of 3 minutes when the compressor is reoperated The same phenomenon occurs when a power is on As a phenomenon that the compressor is reoperated after a delay of...

Page 27: ...l Is voltage at 10 terminal of the Micom normal 0VDC Is voltage at 9 terminal of the Micom normal 5VDC Is rating voltage 10 range applied to the primary side of the BD71 Check linkage between power cord and terminal tap Check fuse Is 325VDC appear in the secondary side of BD71 Replace SMPS PARTS YES NO YES NO YES YES YES NO YES YES YES DC5V 10ms 250ns NO NO OK YES YES YES YES NO NO YES Normal Refe...

Page 28: ...re After unplugging out the power cord should be reconnected within five seconds Does the STD lamp Green blink Does the Solid State Relay SS71 work properly Is the supply voltage of the fan motor sufficient Test rod location PCB CN72 Condition Fan operate about AC 180V Normal voltage pin 3 and 5 YES YES YES NO NO NO Check as in the procedure NO power parts Refer to page 5 2 Microcomputer is out of...

Page 29: ...onds Does the STD lamp blink YES YES NO NO NO NO YES YES Outdoor unit is out of order Power relay is out of order Power relay should be replaced PCB should be checked Microcomputer is out of order PCB should be checked Room temperature sensor is out of order Check as in the procedure No Power parts Refer to page 5 2 Is the room sensor normal register 10 C 20 C 30 C 17 96kΩ 12 09kΩ 8 3kΩ Does the t...

Page 30: ...cord and plug in again in approx 5 seconds Is STD lamp blinking Does operation start when swing button of the remote control unit pushed Voltage at pin 58 61 of micom ICO4 change Squarewave Voltage at pin 13 16 of IC06 ULN2003AFW change Squarewave UP DOWN louver motor is faulty Driver IC06 ULN2003AFW is faulty Micom IC04 is faulty Normal Check as in the procedure No Power parts Refer to page 5 2 A...

Page 31: ... module is faulty Q601 C4375Y or Q602 C1623Y is faulty IR LED CL 1L5EU is faulty sound heard from the indoor unit when ON OFF button on the remote control unit pushed Voltage of battery less than 2 5V Remote Control Unit LCD display status of REMOCON normal Voltage at PIN 30 of Remocon Micom change Voltage at collector of Q601 or Q602 change Voltage at pin 26 of micom IC04 change INDOOR UNIT Micom...

Page 32: ... its substrate So if a circuit board is roughly handled such lead wires and parts will be easily broken or damaged by bending or shock 5 When soldering the lead wires of any new part be sure to polish them using an emery paper or the like before solding them Since the lead wires of any new part are covered with an oxide film solder cannot adhere to the lead wires if not polished 6 When soldering a...

Page 33: ...voltage at BD71 rating voltage 10 range 2 DC voltage at BD71 about 325 v 10 3 DC voltage at IC02 IN GND DC12 v OUT GND DC5 v 4 Voltage waveform at Q201 collector GND squarewave Voltage check 1 check voltage of IC06 pin 10 pin 8 relay on 0 7 v relay off 12 v 2 Voltage at terminal block N1 1 rating voltage Causes Voltage over Indoor unit fan motor short circuit SMPS circuit is faulty SMPS circuit is...

Page 34: ... to 5V Normal At ambient temperature 10 C 30 C Abnormal OΩ open or short Measure resistance between red wire and each terminal Normal Approx 300Ω at ambient temperature 20 C 30 C Abnormal OΩ open or short Ambient temperature 15 C 20 C 25 C 30 C 35 C 40 C Resistance of 14 68 12 09 10 8 31 6 94 5 83 thermistor KΩ between Voltage Gray Orange 0 5V 4 5V Yellow Orange 5V Between Newmotech Wellng Jingjia...

Page 35: ...g up the model option with remocon Note In case the wrong letter has been selected continue to press the button until the correct letter appears 1st If the first stage number appears on the display proceed to the second stage 2nd Every time the and button and each continue to appear 3rd Whenever pressing the 1 2 button the number increase from 0 9 0123456789 and A b C d E F each time If the first ...

Page 36: ...tep 4 Pressing the ON OFF button When pressing the operation ON OFF key with the direction of remote controller for unit the sound Ding or Diriring is heard and the first LED lamp on the left side is flickering at the same time then the input of option is completed If the diriring sound isn t heard try again pressing the ON OFF button Step 5 Unit operation test run First Remove the battery from th...

Page 37: ...Troubleshooting Samsung Electronics 5 12 Table of the option code MODEL MC18AC2 09 MC19AC2 07 MC19AC2 12 MC24AC2 12 OPTION CODE 020000 10021D 020000 1000D9 020000 100340 020000 100340 ...

Page 38: ...MEMO Samsung Electronics 5 13 ...

Page 39: ...rts List 6 1 Indoor Unit 19 16 14 24 9 7 23 4 3 5 6 21 22 8 12 17 18 25 13 4 13 3 13 2 13 13 1 11 10 2 1 15 20 1 20 5 20 4 20 20 6 20 6 1 20 2 20 3 You can search for the updated part code number through the ITSELF URL http itself sec samsung co kr ...

Page 40: ...0251K GRILLE AIR INLET GUARD AIR FILTER ASS Y CLEANER FILTER COVER TERMINAL ASSY PANEL FRONT SPACER EVAP LOW SPACER EVAP UP COVER U BEND ASSY CROSS FAN BOLT SPECIAL MOTOR FAN IN THERMISTOR WIRE ASSY ASSY CONTROL IN ASSY PCB MAIN TERMINAL BLOCK CLAMP CABLE ASSY DISPLAY SWITCH PCB CONNECT WIRE PCB ASSY BACK BODY ASSY HOLDER MOTOR HOLDER PIPE CONNECT WIRE DISPLAY CONNECT WIRE PCB PLATE HANGER ASSY TR...

Page 41: ...Samsung Electronics 6 3 6 2 Outdoor Unit 12 11 6 9 2 10 7 8 14 15 17 17 1 17 6 13 13 1 13 6 16 16 1 16 4 3 4 5 1 MC18AC2X ...

Page 42: ...FRONT GUARD FAN ASSY BASE OUT FAN PROPELLER MOTOR FAN BASE MOTOR GUARD COND ASSY PARTITION ASSY CABI SIDE RH ASSY COVER CONTROL ASSY CABI UPPER ASSY COND UNIT GUIDE SCREEN ROTARY COMPRESSOR NUT FLANGE NUT WASHER COVER TERMINAL GASKET GROMMET ISOLATOR OLP TUBE DISCHARGE A TUBE DISCHARGE B ASSY VALVE TUBE SUCTION A TUBE SUCTION B ASSY TUBE CAPI A ASSY TUBE CAPI B ASSY CONTROL OUT C OIL C OIL CASE CO...

Page 43: ...Samsung Electronics 6 5 12 11 6 9 2 10 7 8 14 15 17 17 1 17 6 13 13 1 13 6 3 4 5 1 16 16 1 16 4 MC19AC2X Exploded Views and Parts List ...

Page 44: ...SSY BASE OUT FAN PROPELLER MOTOR FAN BASE MOTOR GUARD COND ASSY PARTITION ASSY CABI SIDE RH ASSY COVER CONTROL ASSY CABI UPPER ASSY COND UNIT GUIDE SCREEN ROTARY COMPRESSOR ROTARY COMPRESSOR NUT FLANGE NUT WASHER COVER TERMINAL GASKET GROMMET ISOLATOR OLP OLP TUBE DISCHARGE A TUBE DISCHARGE B ASSY VALVE TUBE SUCTION A TUBE SUCTION B ASSY TUBE CAPI A ASSY TUBE CAPI B ASSY CONTROL OUT C OIL C OIL C ...

Page 45: ...Exploded Views and Parts List Samsung Electronics 6 7 12 11 8 17 17 1 17 6 13 13 1 13 6 14 2 10 15 16 16 1 16 4 9 9 1 9 2 1 3 4 7 6 5 MC24AC2X ...

Page 46: ...C124JU1EL 2 13 1 DB60 30018A NUT FLANGE PI0 8 M5 2 13 2 DB60 30028A NUT WASHER HEX 2C M8 6 13 3 DB63 10165D COVER TERMINAL PBT 2 5 2 13 4 DB63 20002A GASKET EPDM T0 8 2 13 5 DB73 00067A GROMMET ISOLATOR NR 40 6 13 6 DB35 00015V OLP RAC12128 9622 2 14 DB62 01356A TUBE DISCHARGE A ASS Y 1 15 DB62 01357A TUBE DISCHARGE B ASS Y 1 16 DB99 00261A ASSY VALVE ASS Y 1 16 1 DB62 01354A TUBE SUCTION A ASS Y ...

Page 47: ...cs 6 9 6 3 Remote Control PCB Box 6 3 1 ASS Y Remote DB93 00251K 1 2 4 5 6 3 7 Parts List No 1 2 3 4 5 6 7 Description INLAY LCD CASE TOP LCD KEY RUBBER ASS Y PCB REMOCON CASE LOW BATTERY COVER Q TY 1 1 1 1 1 1 1 Remark ...

Page 48: ...AY PCB CONNECTOR WIRE PCB U D HOLDER CLAMP IN SEAL CONTROL SIDE SEAL H CONTROL FRONT SCREW MACHINE CABLE CLAMP SCREW TAPPING Specification DB61 00160A DB93 01018A DB65 00078A DB93 00927A DB39 00147A DB61 00219A DB72 10191T DB72 00127V 6001 000929 DB65 10074E 6002 000234 Remark 6 3 2 ASS Y CONTROL IN DB93 01223C 6 4 Indoor Control Unit ...

Page 49: ...MEMO Samsung Electronics 6 11 ...

Page 50: ...ng Cycle Block Diagram INDOOR UNIT OUTDOOR UNIT 2 way valve 3 way valve Capillary tube T1 T2 Gas side Cooling Gas leak check point Liquid side A B Compressor B Compressor A Heat exchanger Condenser Heat exchanger Evaporator Cross fan Cross fan Propeller fan ...

Page 51: ...Samsung Electronics 8 1 8 PCB Diagrams 8 1 ASS Y MAIN PCB DB93 01018A TOP PATTERN ...

Page 52: ...IC VOLT REGULATOR IC PHOTO COUPLER FR DIODE T V S VARISTOR RESONATOR CERAM IC SW TRANS FILTER NOISE COIL RELAY POWER BUZZER HOLDER FUSE FUSE FUSE CONNECTOR HEADER CONNECTOR HEADER CONNECTOR HEADER CONNECTOR HEADER CONNECTOR HEADER CONNECTOR HEADER C FILM C AL C AL C AL C ELEC C CERAMIC C CHIP C CHIP C CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP R CHIP RELAY MINIATURE...

Page 53: ...Samsung Electronics 8 3 8 2 ASS Y MAIN PCB DB93 01018A BOTTOM PATTERN ...

Page 54: ...MIC DIODE SWITCHING R CARBON JUMP CONNECTOR WAFER CONNECTOR WIRE Specification 64 5x53 KSM 713TH5 KPT 1105A 102K 104Z IN4148 470 1 2W 5 10mm SMAW200 05 UL1007 AWG 26 1 1 1 1 1 1 3 2 1 1 Location No RM01 SW01 C01 C02 D01 R01 R02 R03 J01 CN02 CN01 Q TY Remark 8 3 ASS Y DISPLAY PCB DB93 00927A 8 4 ASS Y CENTER DISPLAY DB93 00859A ...

Page 55: ...MEMO Samsung Electronics 8 5 ...

Page 56: ...Samsung Electronics 9 1 9 Wiring Diagrams 9 1 Indoor Unit ...

Page 57: ...Samsung Electronics 9 2 9 2 Outdoor Unit ...

Page 58: ...9 3 Samsung Electronics MEMO ...

Page 59: ...Samsung Electronics 10 1 10 Schematic Diagrams 10 1 Indoor Unit ...

Page 60: ...MEMO 10 2 Samsung Electronics ...

Page 61: ...ou need more information please see the service website Itself Solution Integrated technology supporting electronic library http itself sec samsung co kr Copyright 2002 By Samsung Electronics Co Ltd All rights reserved This manual may not in whole or in part be copied photocopied reproduced translated or converted to any electronic or machine readable from without prior written permission of Samsu...

Page 62: ...ELECTRONICS Samsung Electronics Co Ltd Feb 2003 Printed in Korea Code No DB98 06187A 2 ...

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