DB98_06187A(2)_cover 2/19/03 2:51 PM Page 3 ROOM AIR CONDITIONER INDOOR UNIT OUTDOOR UNIT MC18AC2-09 MC19AC2-07 MC19AC2-12 MC24AC2-12 MC18AC2X SERVICE MC19AC2X MC24AC2X Manual AIR CONDITIONER CONTENTS 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.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 1-1 1. Precautions 1. Warning: Prior to repair, disconnect the power cord from the circuit breaker. 2. Use proper parts: Use only exact replacement parts. (Also, we recommend replacing parts rather than repairing them.) 3. Use the proper tools: Use the proper tools and test equipment, and know how to use them. Using defective tools or test equipment may cause problems later-intermittent contact, for example. Fig. 1-1 Avoid Dangerous Contact 4.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 1-2 MEMO 1-2 Samsung Electronics
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-1 2. Product Specifications 2-1 Table MC18AC2 Model MC19AC2 MC24AC2 INDOOR UNIT OUTDOOR UNT INDOOR UNIT INDOOR UNIT OUTDOOR UNIT INDOOR UNIT OUTDOOR UNIT Item MC18AC2-09 Type MC19AC2X MC24AC2-12 MC24AC2X Wall-Mounting Multi Split Wall-Mounting Multi Split kW 2.65 5.3 2.05 3.5 5.55 3.5 7 BTU/h 9,042 18,084 6,995 11,942 18,937 11,942 23,884 Kcal/h 2,279 4,558 1,763 3,009 4,772 3,009 6,018 \/h 1.2 - 0.9 1.5 - 1.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-2 2-2 Dimensions 2-2-1 Indoor Unit (Unit : mm) (Front view) 245 Air in 790 165 Air out 115 (Remote control) 45 22 Installation plate 2-2 Samsung Electronics
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-3 Product Specifications 2-2-2 Outdoor Unit (Unit : mm) 310 ■ MC18AC2X / MC19AC2X (Rear view) 638 (Front view) 660 880 340 (Unit : mm) 310 ■ MC24AC2X (Rear view) 798 (Front view) 660 1000 Samsung Electronics 340 2-3
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-4 2-3 Pressure Graph ■ MC19AC2-07 ■ 10 2 Low Pressure [kg/cm G] 30.6/22.5 9 27/19 8 21.5/14.6 7 3 20 40 30 Outdoor drybulb temperature [deg C] ■ MC18AC2-09 ■ 10 2 Low Pressure [kg/cm G] 30.6/22.5 9 27/19 8 21.5/14.6 7 3 20 40 30 Outdoor drybulb temperature [deg C] ■ MC19AC2-12 / MC24AC2-12 ■ 10 2 Low Pressure [kg/cm G] 30.6/22.5 9 27/19 8 21.5/14.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-5 3. Operating Instructions and Installation 3-1 Operating Instructions 3-1-1 The Feature of Key in remote controller NO FUNCTION OF KEY NAMED OF KEY Power On/Off button to start and stop airconditioner or timer set up. 1 (UP) Temp. up button. To increase the temperature by the pressing the temperature button. (DOWN) Temp. down button. To decrease the temperature by the pressing the temperature button.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-6 Operating Instructions and Installation 3-1-2 Name & Function of Key in remote controller 1. AUTO MODE : In this mode, operation COOL mode is selected automatically by the room temperature of initial operation. Operation Type Cool Operation Room Temp Tr≥25°C+∆T Compressor ON Tr<24°C+∆T Compressor OFF ∆T= -1°C, -2°C, 0°C+1°C+2°C ∆T is controlled by setting temperature up/down key of remote controller * FAN SPEED : AUTO 2.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-7 Operating Instructions and Installation 8. SWING : BLADE-H is rotated vertically by the stepping motor. *Memory louver : When ON/OFF button is pressed at stop state, the BLADE-H returns to its original location which is operating state before stop *Swing Set : Press the button under the remote control is displayed on LCD the and the blades move up and down. If the one more time press the button, blades location is stop. 10.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-8 3-2 Installation 3-2-1 Selecting Area for Installation Select an area for installation that is suitable to the customer's needs. 3-2-1(a) Indoor Unit 1. Make sure that you install the indoor unit in an area providing good ventilation. It must not be blocked by an obstacle affecting the airflow near the air inlet and the air outlet. 2. Make sure that you install the indoor unit in an area allowing good air handling and endurance of vibration of the indoor unit.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-9 Operating Instructions and Installation 3-2-2 Installation diagram of indoor unit and outdoor unit A Indoor unit gas leak test check point Indoor unit Piping may be laid to the rear, left, right or down .
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-10 Operating Instructions and Installation 3-2-2(a) Fixing the Installation Plate 1. Determine the position of the pipe and drain hose hole using the right figure and drill the hole with an inner diameter of 65mm so that it slants slightly downwards. Installation plate Pipe hole (ø65mm) 2. If you are fixing the indoor unit to a… Then follow Steps… 3. Window frame 4 to 6. 3.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-11 Operating Instructions and Installation 3-2-2(c) Connecting the Assembly Cable. The outdoor unit is powered from the indoor unit via the assembly cable. If the outdoor unit is more than five metres away from the indoor unit, the cable must first be extended to a maximum of ten metres. 1. Extend the assembly cable if necessary. 2. Open the front grille by pulling on the tabs on the lower right and left sides of the indoor unit. 3.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-12 Operating Instructions and Installation 3-2-2(e) Outdoor unit installation GAS LEAK TEST Outdoor unit check point Indoor unit check point Check for gas leak from the flare nut connections with leak detector. WIRING CONNECTION Two electric cables must be connected 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.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-13 Operating Instructions and Installation Grounding (The parts for this work are optional) • A grounding terminal can be found on the outdoor unit as illustrated. 1. When an existing grounding terminal is avilable. (Grounding wire of ø1.6mm or largeror 2mm2 or larger ) Terminal used exclusively for grounding Grounding resistance: less than 100 ohms (existing grounding electrode) Grounding screw hole 2. Use of a grounding electrode.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-14 Operating Instructions and Installation 3-2-2(f) Air-Purge Procedure 1. Connect each assembly pipe to the appropriate valve on the outdoor unit and tighten the flare nut. Indoor unit Outdoor unit A Gas pipe side C B Liquid pipe side D 2. Connect the charging hose of low pressure side of manifold gauge to the packed valve having a service port (3/8” Packed valve) as shown at the figure. 3.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-15 Operating Instructions and Installation 3-2-2(g) Refrigerant Refill • Refill an air-conditioner with refrigerant when refrigerant has been leaked at installing or using. 1. Vacuum system with pump (for new installation, leakage). 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. Suspension hook High pressure gauge Compound gauge 3.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-16 Operating Instructions and Installation 3-2-2(h) Refrigerant Adjustment Class For service For installation Connection Pipe Length 5m Max. 5~10m Air-Purge Method Refrigerant Adjustment Air-Purge Method Refer to the detailed Air-Purge Procedure Unnecessary Purge air using a vacuum pump Add 10g of refrigerant R410A(Add as liquid state) for every 1m.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-17 Operating Instructions and Installation 3-2-2(j) "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 pressure gauge(low pressure side) to the service valve, and open the 3-way valve again. 3. Set the unit to cool operation mode.
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DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-19 4. Disassembly and Reassembly Stop operation of the air conditioner and remove the power cord before repairing the unit. 4-1 Indoor Unit No Parts 1 Front Grille Procedure Remark 1) Stop the air conditioner operation and block the main power. 2) Separate tape of front panel upper. 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. *Taking off the deodorizing filter.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-20 Disassembly and Reassembly No Parts 2 Ass’y Tray Drain. Procedure Remark 1) Do “1”above. 2) Take all the connector of PCB upper side out. (Inclusion Power cord) 3) Separate the outdoor unit connection wire from the terminal block. 4) If pulling the Main PCB up. It will be taken out. 3 Electrical Parts (Main PCB) 4 Heat Exchanger 1) Do “1”, “2” above. Separate the drain hose from the extension drain hose. 2) Pull tray drain out from the back body.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-21 4-2 Outdoor Unit No Parts 1 Cabinet Procedure 1) Turn off the unit and remove the power cable. Remark 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. 2 Fan Motor & Propeller Fan 1) Do Procedure “1” above.
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DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-23 5. Troubleshooting 5-1 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 3 cables. Check the terminals if the indoor unit and outdoor unit are properly linked by the same number of cables.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 2-24 5-2 Fault Diagnosis by Symptom 5-2-1 No Power (completely dead)-Initial diagnosis 1) Checklist : (1) Is input voltage normal? (2) Is AC power linked correctly? (3) Is output voltage of DC regulator IC KA78L05 (IC02) normal? (4.5VDC-5.5VDC) 2) Troubleshooting procedure Remove power cord and plug in again in approx.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 4-1 Troubleshooting 5-2-2 When the Indoor Unit Fan Does Not Operate.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 4-2 Troubleshooting 5-2-3 When the Outdoor Unit Does Not Operate.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 4-3 Troubleshooting 5-2-4 When the UP/DOWN Louver Motor Does Not Operate. (Initial Diagnosis) 1) Checklist : (1) Is input voltage normal? (2) Is the UP/DOWN louver motor properly connected with the connector (CN61)? 2) Troubleshooting procedure Remove power cord and plug in again in approx. 5 seconds. NO Is STD lamp blinking? Check as in the procedure "No Power parts". Refer to page 5-2.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 4-4 Troubleshooting 5-2-6 If Operation By Remote Control Unit Is Impossible. (Initial Diagnosis) 1) Troubleshooting procedure Remove power cord and plug in again approx. 5 Seconds NO Is operation lamp blinking? Check as in the procedure “NO Power parts”. Refer to page 5-2. YES “ “ sound heard from the indoor unit when ON/OFF button on the remote control unit pushed? YES Normal NO YES Replace battery. Voltage of battery less than 2.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 4-5 5-3 PCB Inspection 5-3-1 Cautions for Part Replacement 1. The human body carries much static electricity. Before touching a part for repair, replacement or the similar purpose, be sure to touch a grounded metallic portion by hand to let the static electricity go through the metallic portion to the earth. Especially when handling any micro computer or IC, carefully remove such static electricity before touching them. 2.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 4-6 Troubleshooting 5-3-3 Detailed Procedure No. Malfunction Checking point (symptoms) the AC terminal and confirm 1. Is the broken(open)? Voltage over ∆ 1 ∆ Pull out the power plug from Causes Indoor unit fan the fuse on the PCB assembly motor short-circuit Voltage check SMPS circuit is faulty 1. AC voltage at BD71(~,~)? ∆ SMPS circuit is faulty ∆ : rating voltage ± 10% range PC02, R202-R205 2.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 4-7 5-4 Fault Diagnosis of Major Parts Diagnosis Parts Temp.Sensor Heat ex. Sensor Indoor Fan Motor Measure resistance with a tester. Normal Abnormal Ambient temperature 15°C 20°C 25°C 30°C 35°C 40°C Resistance of thermistor[KΩ] 14.68 12.09 10 8.31 6.94 5.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 4-8 5-5 Set up the Model option The Method for Setting up the model option with remocon • It is necessary to set up option code after replacing the main-PCB as a service parts. Make sure that you can set up the option of code the remote controller after you replace the main PBA otherwise, the unit won’t be working properly and all LED lamps on display will be flickering. Step 1 : Preparing the remocon to main PCB option set 1st Remove the battery from the remocon.
DB98_06187A(2)_1 2/19/03 2:50 PM Page 5-1 Troubleshooting ! If the first number is appear. , it is correct otherwise press until @ When pressing the select one of them. button ~ appear on the display, # When pressing the select one of them. button ~ appear on the display, $ When pressing the select one of them. button ~ appear on the display, % When pressing the select one of them. button ~ appear on the display, ^ When pressing the select one of them.
DB98_06187A(2)_1 2/19/03 3:04 PM Page 5-2 Troubleshooting
5-12 MODEL OPTION CODE MC18AC2-09 020000-10021D MC19AC2-07 020000-1000D9 MC19AC2-12 020000-100340 MC24AC2-12 020000-100340 Samsung ElectronicsDB98_06187A(2)_1 2/19/03 2:50 PM Page 5-3 MEMO Samsung Electronics 5-13
DB98_06187A(2)_2 2/19/03 2:52 PM Page 1-2 6. Exploded Views and Parts List 6-1 Indoor Unit 20 20-6 20-6-1 20-1 20-4 20-5 20-3 20-2 16 19 13 13-2 13-3 13-4 17 18 13-1 14 11 15 12 10 8 22 24 25 21 9 6 5 7 4 23 3 2 1 You can search for the updated part code number through the ITSELF. URL : http://itself.sec.samsung.co.
DB98_06187A(2)_2 2/19/03 2:52 PM Page 2-1 Exploded Views and Parts List ■ Parts List No.
DB98_06187A(2)_2 2/19/03 2:52 PM Page 2-2 6-2 Outdoor Unit ■ MC18AC2X 12 10 7 5 4 11 3 1 14 13(13-1~13-6) 6 17(17-1~17-6) 15 16 (16-1~16-4) 9 2 8 6-3 Samsung Electronics
DB98_06187A(2)_2 2/19/03 2:52 PM Page 2-3 Exploded Views and Parts List ■ Parts List Q’TY No. CODE NO Description Remark Specification MC18AC2X 1 DB90-00734A ASSY CABI FRONT ASS'Y 1 1-1 DB63-00320A GUARD FAN SC-90073T 1 2 DB90-00733A ASSY BASE OUT ASS'Y 1 3 DB67-50063A FAN PROPELLER AS+G / F20%, D405 1 4 DB31-00001F MOTOR FAN IC-9630SLJ5A 1 5 DB61-20008C BASE MOTOR SGCC-M, T1.
DB98_06187A(2)_2 2/19/03 2:52 PM Page 2-4 Exploded Views and Parts List ■ MC19AC2X 12 10 7 5 4 11 3 1 14 13(13-1~13-6) 6 17(17-1~17-6) 15 9 2 16 (16-1~16-4) 8 6-5 Samsung Electronics
DB98_06187A(2)_2 2/19/03 2:52 PM Page 2-5 Exploded Views and Parts List ■ Parts List Q’TY No. CODE NO Description Remark Specification MC19AC2X 1 DB90-00734A ASSY CABI FRONT ASS'Y 1 1-1 DB63-00320A GUARD FAN SC-90073T 1 2 DB90-00733B ASSY BASE OUT ASS'Y 1 3 DB67-50063A FAN PROPELLER AS+G / F20%, D405 1 4 DB31-00001F MOTOR FAN IC-9630SLJ5A 1 5 DB61-20008C BASE MOTOR SGCC-M, T1.
DB98_06187A(2)_2 2/19/03 2:52 PM Page 2-6 Exploded Views and Parts List ■ MC24AC2X 12 6 11 10 8 7 5 4 17(17-1~17-6) 3 1 13(13-1~13-6) 14 15 2 16(16-1~16-4) 9(9-1~9-2) 6-7 Samsung Electronics
DB98_06187A(2)_2 2/19/03 2:52 PM Page 2-7 Exploded Views and Parts List ■ Parts List Q’TY No.
DB98_06187A(2)_2 2/19/03 2:52 PM Page 2-8 6-3 Remote Control & PCB Box 6-3-1 ASS’Y Remote : DB93-00251K 3 7 6 4 5 1 2 ■ Parts List 6-9 No Description Q’TY 1 INLAY LCD 1 2 CASE TOP 1 3 LCD 1 4 KEY RUBBER 1 5 ASS'Y PCB REMOCON 1 6 CASE LOW 1 7 BATTERY COVER 1 Remark Samsung Electronics
DB98_06187A(2)_2 2/19/03 2:52 PM Page 3-1 6-4 Indoor Control Unit 6-3-2 ASS’Y-CONTROL IN : DB93-01223C ■ Parts List No Description 1 HOLDER CONTROL DB61-00160A 2 ASSY MAIN PCB DB93-01018A 3 TERMINAL BLOCK ASSY DB65-00078A 4 ASS'Y DISPLAY PCB DB93-00927A 5 CONNECTOR WIRE PCB U/D DB39-00147A 6 HOLDER CLAMP IN DB61-00219A 7 SEAL CONTROL SIDE DB72-10191T 8 SEAL H/CONTROL FRONT DB72-00127V 9 SCREW MACHINE 6001-000929 10 CABLE CLAMP DB65-10074E 11 SCREW TAPPING 6002-000234
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DB98_06187A(2)_2 2/19/03 2:52 PM Page 3-5 PCB Diagrams ■ Parts List No Description Specification 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 PCB-MAIN IC-MCU IC DRIVE EEPROM PHOTO COUPLER TR SMALL SIGNAL TR SMALL SIGNAL TR DIGITAL DIODE BRIDGE ZENER ZENER SSR TR SWITCH IC VOLT REGULATOR IC PHOTO COUPLER FR-DIODE T.V.
DB98_06187A(2)_2 2/19/03 2:52 PM Page 3-6 8-2 ASS’Y MAIN PCB;DB93-01018A ■ BOTTOM PATTERN 8-3 Samsung Electronics
DB98_06187A(2)_2 2/19/03 2:52 PM Page 3-7 8-3 ASS’Y DISPLAY PCB;DB93-00927A ■ Parts List No Description Location No. Specification Q’TY 64.
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DB98_06187A(2)_2 2/19/03 2:52 PM Page 3-10 9-2 Outdoor Unit 9-2 Samsung Electronics
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DB98_06187A(2)_2 2/19/03 2:52 PM Page 3-14 UPDATE LOG SHEET Application date Page Part# Note(Cause & Solution) Use this page to keep any special servicing information. (Service Bulletin, etc.) If only parts number changes, Just change parts number directly on parts list. And if you 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.
DB98_06187A(2)_cover 2/19/03 2:51 PM Page 2 ELECTRONICS © Samsung Electronics Co., Ltd. Feb. 2003. Printed in Korea. Code No.
