Samsung AC018KN4DCH User manual

1. Precautions
2. Product Specifications
3. Disassembly and Reassembly
4. Troubleshooting
5. PCB Diagram
6. Wiring Diagram
7. Reference Sheet
CONTENTSSYSTEM AIR CONDITIONER
INDOOR UNIT OUTDOOR UNIT
SYSTEM AIR CONDITIONER
CIRCULAR CASSETTE SERIES
AC018KN4DCH
AC024KN4DCH
AC030KN4DCH
AC036KN4DCH
AC042KN4DCH
AC048KN4DCH
AC018JX4DCH
AC024JX4DCH
AC030JX4DCH
AC036JX4DCH
AC042JX4DCH
AC048JX4DCH

Section 0
1
Contents
1. Precautions
..............................................................................................................................................................................................
1-1..
1-1. Precautions for the Service ......................................................................................................................................................... 1-1..
1-2. Precautions related to static electricity and PL ................................................................................................................... 1-1..
1-3. Precautions related to product safety ................................................................................................................................... 1-2..
1-4. Other precautions
.......................................................................................................................................................................... 1-2..
2. Product Specifications .................................................................................................................................................................... 2-1..
2-1. The Feature of Product ................................................................................................................................................................. 2-1..
2-2. Product Specifications
.................................................................................................................................................................. 2-2..
2-3. Specifications of optional items ............................................................................................................................................... 2-6..
2-3-1. Accessories
........................................................................................................................................................................... 2-6..
2-3-2. Wireless remote controller (AR-KH00U) ................................................................................................................... 2-7..
2-3-3. Wired remote controller (AWR-WE10N) .................................................................................................................. 2-8..
2-3-4. Filter specifications ............................................................................................................................................................ 2-9..
3. Disassembly and Reassembly
.................................................................................................................................................. 3-1..
3-1. Necessary Tools
............................................................................................................................................................................... 3-1..
3-2. Indoor Unit
........................................................................................................................................................................................ 3-2..
3-3. Outdoor Unit..................................................................................................................................................................................... 3-11
4. Troubleshooting .......................................................................................................................................................................... 4-1 .
4-1. Setting an indoor unit address and installation option .................................................................................................. 4-1..
4-1-1. The procedure of setting option.................................................................................................................................. 4-1..
4-1-2. The procedure of setting option ................................................................................................................................. 4-2..
4-1-3. Order for Setting Options (Wired Remote Controller) ........................................................................................ 4-12
4-1-4. Indoor address(MAIN/RMC)setting ............................................................................................................................ 4-13
4-1-5. Set the indoor installation options(Option to set for the installation site conditions)........................... 4-14
4-1-6. Changing the addresses and options individually............................................................................................... 4-15
4-2. Model-specific option code............................................................................................................................................................ 4-16
4-3. Items to check before diagnostics ........................................................................................................................................... 4-17
4-3-1. Test run mode and View mode .................................................................................................................................. 4-17
4-3-2. Eco Mode [Power Save Mode]...................................................................................................................................... 4-19
4-3-3.
Error code [indoor] ........................................................................................................................................................... 4-21
4-3-4. Error code [outdoor].......................................................................................................................................................... 4-22
4-3-5.Wired remote controller .................................................................................................................................................. 4-24
4-4. Troubleshooting by symptoms ................................................................................................................................................... 4-27
4-1-1. When the outdoor unit power is not ON – Initial Diagnosis : 1-phase products .................................... 4-27
4-4-2. Indoor temperature sensor error (E121) .................................................................................................................. 4-28
4-4-3. Indoor heat exchanger temperature sensor error (E122).................................................................................. 4-29
4-4-4. Indoor Fan error (E154) .................................................................................................................................................... 4-30
4-4-5. Communication error after finishing Tracking (E202)......................................................................................... 4-31
4-4-6. Indoor unit float sensor error ........................................................................................................................................
4-32
4-4-7. EEPROM circuit failure (E162) ........................................................................................................................................
4-33
4-4-8. When the outdoor unit power is not ON - Initial Diagnosis : 3-phase products ..................................... 4-34
4-4-9. Indoor/outdoor communication error (1min.) (Error Code : E202) .............................................................. 4-38
4-4-10. Communication error between outdoor unit INV ׳MAIN MICOM (1 min.)(Error Code: E203)... 4-40

Section 0
2
Contents
4-4-11. Outdoor sensor error(Error Code : E221, E231, E251, E320)............................................................................ 4-41
4-4-12.Reverse phase / Loss phase detection (3-phase outdoor unit) (Error Code : E425 )..............................
4-42
4-4-13. Compressor down due to freezing control (Error Code : E403).................................................................... 4-43
4-4-14. Outdoor unit Fan error (Error Code : E458, E475) ............................................................................................... 4-44
4-4-15. Compressor starting error / rotation error (Error Code : E461, E467).......................................................... 4-45
4-4-16. Full current error / PFC over-current error (Error Code : E462, E484)...........................................................
4-47
4-4-17. IPM IPM (Over Current) error (Error Code : E464) ................................................................................................ 4-48
4-4-18. DC LINK over-current / low-voltage error (Error Code : E466)
H/W DC_Link Over Voltage Error (Error Code : E483)
AC Input Voltage Sensor Error (Error Code : E488)...................................................................................................................................... 4-51
4-4-19. Gas leakage error(Error Code : E554)............................................................................................................................................................................. 4-52
4-4-20. Pipe blockage error(Error Code : E422)....................................................................................................................................................................... 4-54
4-4-21. Smart install mode was not carried out (Error Code : E508 )........................................................................................................... 4-55
4-4-22. Others.................................................................................................................................................................................................................................................................... 4-57
5. PCB Diagram and Parts List ........................................................................................................................................................ 5-1...
5-1. PCB Diagram
.................................................................................................................................................................................... 5-1...
5-1-1. Indoor Unit Main PCB ....................................................................................................................................................... 5-1...
5-1-2 Indoor Unit Power PCB...................................................................................................................................................... 5-3...
5-1-3. Display PCB ........................................................................................................................................................................... 5-4...
5-2. Outdoor Unit
.................................................................................................................................................................................... 5-5...
5-2-1. Main PCB ................................................................................................................................................................................ 5-5...
5-2-2. SUB PCB ................................................................................................................................................................................. 5-7...
5-2-3. MAIN PCB .............................................................................................................................................................................. 5-7...
5-2-4. INVERTER PCB ...................................................................................................................................................................... 5-9...
5-2-5. EMI PCB .................................................................................................................................................................................. 5-10.
6. Wiring Diagram .................................................................................................................................................................................... 6-1...
6-1. Indoor Unit
........................................................................................................................................................................................ 6-1...
6-2. Outdoor Unit
.................................................................................................................................................................................... 6-2...
7. Reference Sheet
................................................................................................................................................................................... 7-1...
7-1. Index for model name .................................................................................................................................................................. 7-1...
7-1-1. Indoor Unit ............................................................................................................................................................................ 7-1...
7-1-2. Outdoor Unit ........................................................................................................................................................................ 7-3...
7-1-3. Panel
........................................................................................................................................................................................ 7-3....
7-2. Refrigerating Cycle Diagram ...................................................................................................................................................... 7-4....

1-1
1. Precautions
1-1 Precautions for the Service
O Use the standard parts when replacing the electric parts.
– Confirm the model name, rated voltage, rated current of the electric parts.
O When repairing the equipment, connection of the harness parts must be firm and solid.
– A loose connection may cause noise or other malfunction.
O When assembling and disassembling the equipment while it is laid down, lay it on soft cloth.
– Otherwise it may scratch the back of the exterior of the product.
O Remove dust or dirt completely from the housing block, wiring block and service parts during repair.
– This helps prevent the danger of fire caused by tracking or short circuit.
O Fasten the valve caps of service valves and charging valves of outdoor unit as much as possible using adjustable wrenches.
O Check the status of the components’ assembly after repair service.
– The status must be the same as before the repair service.
1-2 Precautions related to static electricity and PL
OThe PCB power supply block is susceptible to static electricity. Therefore, care must be taken during repair or measuring
while the power is on.
– Wear insulation gloves for PCB repair or measuring.
OCheck whether the installation location is at least two meters away from other electronic products such as TV, video, or
audio.
– Otherwise, the video quality might be degraded or noise might be generated.
ODo not let end users repair the products themselves.
– Unauthorized disassembly might cause electric shock or fire.

1-2
1-3 Precautions related to product safety
O Do not pull the power cord and do not touch the power plug or aux power switch
with wet hands.
– It might cause electric shock or fire.
O A damaged power line or power plug must be replaced to prevent danger.
O Do not bend the power cable with excessive force, and do not place a heavy weight
on the case as it might damage the cable.
– It might cause electric shock or fire.
O Do not use multiple electric outlets.
– This might cause electric shock or fire.
O Connect the ground terminal when necessary.
– You must connect the ground terminal if you determine that there is a danger of electric
leakage due to moisture or water.
O Unplug the power cable or turn off the auxiliary power switch for electric part
replacement and repair service.
– Otherwise it might cause electric shock.
O Instruct end users to separate the batteries from the remote controllers and store
them separately when the product is not used for long time.
– Otherwise leakage from the dry cell may cause problems with the remote controller.
1-4 Other precautions
OThe pipes should have no leaks during installation, and the compressor must be stopped before removing connecting
pipes for pump down work. Operating the compressor while the service valve is open and coolant pipe is not properly
connected may cause explosion or injury due to abnormal high pressure created inside the coolant cycle as the air can be
absorbed through the pipe.
OPump Down work procedure (When uninstalling the product)
– Turn on the air conditioner, select cooling operation, and run the compressor for more than three minutes.
– Release the high pressure and low pressure valve caps.
– Close the high pressure valve completely using an L-wrench
– After about two minutes, close the low pressure valve completely.
– Stop running the air conditioner.
– Separate the connecting pipe.

2-1
□360 Cassette
□Differentiated innovation air cooling
It delivers a cool air evenly with the circular air current and provides a wide and agreeable cooling area than general ceiling
air conditioners.
□Refreshing and soft wind
It provides a horizontal air current that form natural convection instead of unpleasant direct wind.
It is consumer-friendly product that prevents the sudden effective temperature tumble.
□High quality circular design
It applied the wind direction control technology (Coanda effect) which uses the booster fan. Epoch-making circular design
that eliminates the blade.
□Eco-friendly air conditioner
It is eco-friendly air conditioner that is certified a RoHS technology as well as realize high effectiveness, low noise, super
power saving.
□Electricity savings through S- Inverter System
Apply S-inverter system that change capacity to 10~160% according to circumstance by one compressor and reduce
optimum cooling effect and unnecessary electricity consumption.
□Clearness function of four seasons high efficiency
Energy consumption and driving noise decrease more because can operate clearness function separately.
Make healthy and clean environment by bacillus exclusion function and active oxygen neutralization function that virus
doctor at air conditioner driving removes air various hazardous substances operating always..
2. Product Specifications
2-1 The Feature of Product

2-2 2-3
2-2 Product Specifications
ITEM
AC018KN4DCH
AC018JXADCH
AC024KN4DCH
AC024JXADCH
AC030KN4DCH
AC030JXADCH
AC036KN4DCH
AC036JXADCH
AC042KN4DCH
AC042JXADCH
AC048KN4DCH
AC048JXADCH
Design
Indoor Unit
Outdoor Unit
Remote Controller
Performance Cooling [Btu/h] 18000.0 24000.0 30000.0 36000.0 42000.0 48000.0
Heating [Btu/h] 20000.0 27000.0 32000.0 40000.0 47000.0 53000.0
Power Consumption Cooling [W] 1580.0 2160.0 2890.0 3000.0 4200.0 5410.0
Heating [W] 1600.0 2470.0 3060.0 3450.0 4530.0 5120.0
EER/COP Cooling [Btu/hW] 11.4 11.1 10.4 12.0 10.0 8.9
Heating [Btu/hW] 12.5 10.9 10.5 11.6 10.4 10.4
Voltage / Frequency 208-230V/60Hz 208-230V/60Hz 208-230V/60Hz 208-230V/60Hz 208-230V/60Hz 208-230V/60Hz
Operating Current Cooling [A] 7.2 9.8 13.4 13.9 18.8 23.8
Heating [A] 7.4 11.6 14.4 16.1 20.5 23.5
Noise Indoor Unit [dBA] 42 45 47 50 51 51
Outdoor Unit [dBA] 58 60 60 60 62 62
Size
Net Dimension
(WxHxD)
Indoor Unit [mm] 947*281*947 947*281*947 947*365*947 947*365*947 947*365*947 947*365*947
Outdoor Unit [mm] 880*310*638 940*330*998 940*330*998 940*330*1210 940*330*1210 940*330*1210
Shipping Dimension
(WxHxD)
Indoor Unit [mm] 990*330*990 990*330*990 990*414*990 990*414*990 990*414*990 990*414*990
Outdoor Unit [mm] 1023*413*730 995*426*1096 995*426*1096 995*426*1388 995*426*1388 995*426*1388
Weight
Net Indoor Unit [kg] 21.0 21.0 24.0 24.0 24.0 24.0
Outdoor Unit [kg] 45.0 64.5 70.0 88.0 88.0 88.0
Shipping Indoor Unit [kg] 25.0 25.0 28.5 28.5 28.5 28.5
Outdoor Unit [kg] 48.0 69.5 74.0 98.0 98.0 98.0
Harness
Specifications
Indoor Fan Motor DB31-00578D DB31-00578D DB31-00577C DB31-00577C DB31-00577C DB31-00577C
Compressor UG4T150LNBEQ UG4T200LNFE4 UG8T300LNBJU UG5T450FUEJX UG5T450FUEJX UG5T450FUEJX
Outdoor Fan Motor DB31-00642A DB31-00579A DB31-00579A DB31-00579A DB31-00579A DB31-00579A

2-4 2-5
ITEM
AC018KN4DCH
AC018JXADCH
AC024KN4DCH
AC024JXADCH
AC030KN4DCH
AC030JXADCH
AC036KN4DCH
AC036JXADCH
AC042KN4DCH
AC042JXADCH
AC048KN4DCH
AC048JXADCH
PC4NUDMAN High Pressure 4.1 4.1 4.1 4.1 4.1 4.1
Low Pressure 1.4 1.4 1.4 1.4 1.4 1.4
PANEL PC4NUDMAN PC4NUDMAN PC4NUDMAN PC4NUDMAN PC4NUDMAN PC4NUDMAN
Refrigerant Type R410A R410A R410A R410A R410A R410A
Factory Charging [g] 1300 2100 2600 2800 2800 2800
Additional Refrigerant (Over 5m, for every 5m) [g] 10 10 22 33 33 33
Basic Piping Length [m] 7.5 7.5 7.5 7.5 7.5 7.5
Max. Piping Length [m] 30 50 50 75 75 75
Max. Level Difference [m] 20 30 30 30 30 30
Option Code
0100EF-1950D8-27343B-370005
020000-100000-200000-300000
030000-100000-200000-300000
0100EF-1950D8-274750-370005
020000-100000-200000-300000
030000-100000-200000-300000
0100EF-19541A-275A64-370045
020000-100000-200000-300000
030000-100000-200000-300000
0100EF-19548C-276470-370045
020000-100000-200000-300000
030000-100000-200000-300000"
0100EF-19549D-277D8C-370045
020000-100000-200000-300000
030000-100000-200000-300000
0100EF-1954AF-278CA0-380045
020000-100000-200000-300000
030000-100000-200000-300000

2-6
2-3 Specifications of optional items
2-3-1 Accessories
Item Description Code No. Q’ty Remark
ASSY DRAIN- HOSE DB94-02719B 1
Standard / Indoor unit
Cable tie DB65-00191A 6
Seal-drain ass'y DB62-05810A 1
Seal-drain ass'y DB94-05810F 1
Seal-drain ass'y DB94-05810G 1
Indoor unit installation manual DB68-05975A
1
USER MANUAL DB68-05974A
1
BRACKET-CONDUIT DB61-05788A 1
Drain cap DB63-10355C 5
Standard / Outdoor
unit
Pipe plug DB67-00806A 2
Rubber Leg
DB67-01534A
AC018JXADCH :
DB67-01533A
4
Outdoor unit installation manual
DB6805462A
AC018JXADCH :
DB68-05138A
1
Bolt-flange 6009-001435 4
Standard / Panel
INSTALL MANUAL DB68-05903A 1

Product Specifications
2-7
Item Description Code No. Q’ty Remark
Wireless remote controller DB93-15771C 1
Optional
Batteries for remote controller
(specification: "AAA" type)
4301-000121 2
Remote controller holder DB61-06607A 1
M4×16 Screw 6002-000581 2
User’s manual DB68-05911A 1
2-3-2 Wireless remote controller (AR-KH00U)

Product Specifications
2-8
2-3-3 Wired remote controller (MWR-WE10N)
Item Description Code No. Q’ty Remark
Wired remote controller DB93-11251F 1
Optional
Cable tie DB65-10088B 2
Cable clamp DB65-10074E 3
M4×16 Screw 6002-000474 5
User's manual DB68-03732A 1
Installation manual DB68-03716A 1

Product Specifications
2-9
2-3-4 Filter specifications
Item Description Code No. Remark
FILTER-AIR DB63-03764A

3-1
Item Remark
+ Screw Driver
Monkey Spanner
(8mm, 10mm, 13mm)
M6, M8 Hex Wrench
Spanner Torque Wrench
3. Disassembly and Reassembly
3-1 Necessary Tools

3-2
3-2 Indoor Unit
No. Parts Procedure Remark
1 Panel ▶Ceiling type Panel
1) Pull up the corner 4 places of Panel and
separate it.
2) Remove the 4 screws from the corner of
Panel. (Use +Screw Driver)
3) Pull the hook of Panel and then separate the
Panel from the Indoor Unit.
1 Panel ▶Open type Panel
1) Rotate the outside Panel to counterclockwise
direction and then separate it.

Disassembly and Reassembly
3-3
No. Parts Procedure Remark
1 Panel 2) Rotate the Grille to counterclockwise
direction.
3) Remove the safety clip of Grill inside and then
separate the Panel from the Indoor Unit.
4) Pull up the Filter from the Grill and separate it.
2 Control Box 1) Reomove the 2 screws which is fixed to the
Indoor Unit upper part.(Use +Screw Driver)
2) Rotate the Guard Fan to counterclockwise
direction and separate it

Disassembly and Reassembly
3-4
No. Parts Procedure Remark
2 Control Box 3) Reomove the 1 screw which is fixed to the
Indoor Unit upper part.(Use +Screw Driver)
4) Put finger in the "PULL" marked groove and
then pull up the Cover
5) Put finger in the "PULL" marked groove and
then avoids the hook and it opens the Control
Box Cover

Disassembly and Reassembly
3-5
No. Parts Procedure Remark
2 Control Box 6) Separate the connectors from the Control Box.
7) Remove the ground screw.
(Use +Screw Driver)
3 Top Cover & Drain Pan 1) Remove the 3 screws. (Use +Screw Driver)
2) Push the hook and separate the Cover.
Damage can occur to product in case of use a
sharp tool.
3) Remove the screw which is fixed to Booster
Fan. (Use +Screw Driver)

Disassembly and Reassembly
3-6
No. Parts Procedure Remark
3 Top Cover & Drain Pan 4) Pull the Booster Fan connector and separate
the connector.
5) Remove the 4 screws. (Use +Screw Driver)
6) Push the hook and separate the Cover.

Disassembly and Reassembly
3-7
No. Parts Procedure Remark
3 Top Cover & Drain Pan 7) Remove the screw and separate the Display
Cover. (Use +Screw Driver)
8) ) Remove the 2 screws. (Use +Screw Driver)
9) Push the hook and separate the Cover.
10) Remove the 8 screws. (Use +Screw Driver)
11)Separate the Indoor Unit upper part from
the Body

Disassembly and Reassembly
3-8
No. Parts Procedure Remark
3 Top Cover & Drain Pan 12)Remove the 3 screws. (Use +Screw Driver)
13)Pull the hook that is on the side and separate
the Cover.
4 Drain Pump & Hose 1) Separate the Drain Hose from the Drain Pump.