Samsung AC024KNZDCH/AA, AC042KNZDCH/AA, AC030KNZDCH/AA, AC036KNZDCH/AA, AC048KNZDCH/AA Service Manual

AHU SERIES CONTENTS

SYSTEM AIR CONDITIONER

AHU SERIES

1. Precautions

2. Product Specifications

3. Disassembly and Reassembly

4. Troubleshooting

5. PCB Diagram and Part List

6. Wiring Diagram

7. Reference Sheet

INDOOR UNIT OUTDOOR UNIT

Model :

AC018KNZDCH/AA
AC024KNZDCH/AA
AC030KNZDCH/AA
AC036KNZDCH/AA
AC042KNZDCH/AA
AC048KNZDCH/AA
AC054KNZDCH/AA

AC018JXADCH/AA
AC024JXADCH/AA
AC030JXADCH/AA
AC036JXADCH/AA
AC042JXADCH/AA
AC048JXADCH/AA
AC054KXADCH/AA

Section 0

Samsung Electronics 1

Contents

1. Precautions ........................................................................................................ 1-1

1-1 Precautions for the Service.............................................................................................................................. 1-1

1-2 Precautions for the Static Electricity and PL ............................................................................................. 1-1

1-3 Precautions for the Safety ................................................................................................................................ 1-1

1-4 Other ........................................................................................................................................................................ 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 .................................................................................................................... 2-4

2-3-1 Accessories ................................................................................................................................................. 2-4

3. Disassembly and Reassembly .......................................................................... 3-1

3-1 Indoor unit ..................................................................................................................................................... 3-2

3-2 Outdoor Unit ................................................................................................................................................. 3-7

4. Troubleshooting ............................................................................................... 4-1

4-1 Indoor Display Error and Check Method ................................................................................................... 4-1

4-1-1 Indoor unit LED lamp display at error detecting ........................................................................ 4-1

4-1-2 Wired Remocon Error Display ............................................................................................................ 4-2

4-2 Troubleshooting by symptoms ..................................................................................................................... 4-4

4-2-1 Indoor temperature sensor (open/short) ...................................................................................... 4-4

4-2-2 Eva in and out sensor (open/short) .................................................................................................. 4-5

4-2-3 Fan error ...................................................................................................................................................... 4-13

4-2-4 Terminal Block's Terminal Fuse(Open) ........................................................................................... 4-14

4-2-5 Outdoor's service valve(Clog)

4-2-6 EEPROM error

4-2-7 Option error

4-3 Setting the indoor unit option code ........................................................................................................... 4-12

4-3-1 Setting an indoor unit address and installation option .......................................................... 4-12

4-4 Items to be checked first .................................................................................................................................. 4-23

5. PCB Diagram and Parts List.............................................................................. 5-1

5-1 Indoor Unit ............................................................................................................................................................. 5-1

5-1-1 MAIN PCB Diagram ................................................................................................................................. 5-1

5-2 Outdoor Unit ......................................................................................................................................................... 5-3

5-2-1 MAIN PCB .................................................................................................................................................... 5-3

5-2-2 SUB PCB ....................................................................................................................................................... 5-5

5-2-3 MAIN PCB .................................................................................................................................................... 5-6

5-2-4 INVERTER PCB ........................................................................................................................................... 5-7

5-2-5 EMI PCB........................................................................................................................................................ 5-9

2 Samsung Electronics

Contents

6. Wiring Diagram ................................................................................................. 6-1

6-1 Indoor Unit ............................................................................................................................................................. 6-1

6-2 Outdoor Unit ......................................................................................................................................................... 6-3

7. Reference Sheet ................................................................................................ 7-1

7-1 Refrigerating Cycle Diagram .......................................................................................................................... 7-1

7-2 Index of Model Name ........................................................................................................................................ 7-2

7-2-1 Indoor Unit ................................................................................................................................................. 7-2

7-2-2 Outdoor Unit ............................................................................................................................................. 7-3

Samsung Electronics 1-1

1-1 Precautions for the Service

ƒ Use the standard parts when replacing the electric parts.

– Confirm the model name, rated voltage, rated current of the electric parts.

ƒ Repair the disconnection of HARNESS securely when repairing the break down.

– If there is any connection error, it causes an abnormal noise and incorrect operation.

ƒ In case that you assemble or disassemble the products with laying it on the side, do work on the work cloth.

– If not, the exterior of products can be scratched.

ƒ Remove dust and foreign materials from harness, connection part, and inspection part thoroughly when repairing the break down.

– It protects the danger of fire such as tracking and short.

ƒ Tighten tightly the service valve of outdoor unit and the cap of charging valve with a monkey spanner.

ƒ Check the assembly status of parts after repairing the break down.

– It should be same as the status before repairing.

1-2 Precautions for the Static Electricity and PL

ƒ As the PCB power terminal has a weakness for the static electricity, pay attention to it during the repair and measurement.

– Work with insulation gloves during the repair and measurement of PCB.

ƒ Check the distance between the product and the other electronic appliances such as TV, video, and audio. It should be over 2m.

– If not, it causes a bad picture quality or a noise.

ƒ Repairing the products by consumer should be strictly prohibited.

– There is a danger of electric shock or fire due to incorrect disassembly.

1-3 Precautions for the Safety

ƒ Do not pull any electric wires and do not touch an auxiliary power switch with a wet hand.

– There is a danger of electric shock or fire.

ƒ In case any wire or power plug has been damaged, replace it to eliminate any possible danger.

ƒ Do not bend the power cord by force and do not put any heavy object on the power cord.

– There is a danger of electric shock or fire.

ƒ Do not use multi socket.

– There is a danger of electric shock or fire.

ƒ Ground the product if necessary.

– Be sure to ground the product if there is any danger of electric leakage due to water or moisture.

ƒ Be sure to turn off the auxiliary power switch or pull out the power plug during replacement or repair of electric parts.

– There is a danger of electric shock.

ƒ In case the product will not be in use for a long time, the battery of remote control should be kept separately.

– Leakage of inside fluid can cause break down of remote control.

1. Precautions

1-1 Precautions for the Service

Precautions

1-2 Samsung Electronics

1-4 Others

ƒ Never store or load the air conditioner upside down or sideways to prevent the damage to the compressor.

ƒ Young children or infirm persons should be always supervised when they use the air conditioner.

ƒ Max current is measured according to IEC standard for safety.

ƒ Current is measured according to ISO standard for energy efficiency.

ƒ When installing, make sure there is no leakage. When recovering the refrigerant, ground the compressor first before removing the

connection pipe. If the refrigerant pipe is not properly connected and the compressor works with the service valve open, the pipe
inhales the air and it makes the pressure inside of the refrigerant cycle abnormally high. It may cause explosion and injury.

ƒ Pump Down Procedure (When removing the product)

- Turn on the air conditioner and select Cool mode to run the compressor for 3 minutes.

- Release the valve caps on High and Low pressure side.

- Use L wrench to close the valve on the high pressure side.

- Approximately 2 minutes after, close the valve on the low pressure side.

- Stop operation of the air conditioner.

- Disconnect the pipes.

Samsung Electronics 2-1

2. Product Specifications

2-1 The Feature of Product

Ŷ Built-in Duct Type

After installed, the air conditioner can be harmonized with a room interior.

Ŷ High Performance & Energy Saving

With the advanced BLDC inverter technology, it makes a room cool with highly energy saving and arises the efficiency of
air conditioner.

Ŷ Long Piping (Length & Height)

It can give the benefit to the installers and aries the reliability of the air conditioner.

Ŷ Long Ambient Operation (In Low Temperature)

It can arise the reliability and the capacity of the air conditioner, especially operated in low temperature.

Ŷ Eco-friendly Product (Lead-Free, RoHS, WEEE)

2-2 Samsung Electronics

Product Specifications

Samsung Electronics 2-3

2-2 Product Specifications

ITEM

AC018KNZDCH/AA
AC018JXAD CH/AA

AC024KNZDCH/AA
AC024JX ADCH/AA

AC030KNZDCH/AA
AC030JX ADCH/AA

AC036KNZDCH/AA
AC036JX ADCH/AA

AC042KNZDCH/AA
AC042JX ADCH/A A

AC048KNZDCH/AA
AC048J XADCH/A A

AC054KNZDCH/AA
AC054K XADCH/A A

IMAGE

Indoor Unit

Outdoor Unit

Power Supply

1Φ, 208-230V, 60Hz 1Φ, 208-230V, 60Hz 1Φ, 208-230V, 60Hz 1Φ, 208-230V, 60Hz 1Φ, 208-230V, 60Hz 1Φ, 208-230V, 60Hz 1Φ, 208-230V, 60Hz

Performance Cooling/Heating

Btu/h 18,000 / 20,000 24,000 / 27,000 30,000 / 32,000 36,000 / 40,000 42,000 / 47,000 48,000 / 53,000 54,000 / 60,000

Power Consumption Cooling/Heating

kW 1.60 / 2.00 2.18 / 2.64 2.95 / 2.82 3.16 / 3.62 4.14 / 4.22 5.00 / 4.95 6.72 / 5.80

EER/COP Cooling/Heating

Btu/hW 11.25 / 10 11.01 / 10.23 10.17 / 11.35 11.39 / 11.05 10.14 / 11.14 9.6 / 10.71 8.04 / 10.34

Energy Grade

Energy Grade (C) SEER 20.1 SEER 19.5 SEER 19.6 SEER 19.0 SEER 18.4 SEER 18.0 SEER 17.1
Energy Grade (H) HSPF 10.5 HSPF 11.5 HSPF 10.4 HSPF 10.2 HSPF 9.6 HSPF 9.7 HSPF 9.0

Operation Current Cooling/Heating

A 7.1 / 8.7 9.8 / 11.6 13.0 / 12.3 14.1 / 15.8 18.0 / 18.3 21.3 / 21.6 28.7 / 24.7

Noise

(Cooling / Heating)

Indoor Unit

dBA 38 / 38 41 / 41 41 / 41 42 / 42 42 / 42 43 / 43 45 / 45

Outdoor Unit

dBA 48 / 48 50 / 50 50 / 52 49 / 51 51 / 53 53 / 55 56 / 56

Size

Net Dimension

(WxHxD)

Indoor Unit

mm 445 x 1,092 x 533 445 x 1,092 x 533 533 x 1,219 x 533 533 x 1,219 x 533 622 x 1,492 x 552 622 x 1,492 x 552 622 x 1,492 x 552

Outdoor Unit

mm 880 x 638 x 310 94 0 x 998 x 330 940 x 998 x 330 9 40 x 1,210 x 330 940 x 1,210 x 330 940 x 1,210 x 330 940 x 1420 x 330

Shipping

Dimension

(WxHxD)

Indoor Unit

mm 493 x 1,135 x 665 493 x 1,135 x 665 590 x 1,305 x 665 590 x 1,305 x 665 676 x 1,588 x 695 676 x 1,588 x 695 676 x 1,588 x 695

Outdoor Unit

mm 1,023 x 730 x 413 995 x 1,096 x 426 995 x 1,096 x 426 995 x 1,388 x 426 995 x 1,388 x 426 995 x 1,388 x 426 995 x 1598 x 426

Weight

Net

Indoor Unit

kg 44. 5 44.5 56.0 56.0 74.0 74.0 74.0

Outdoor Unit

kg 45.0 64.5 70.0 88.0 88.0 88.0 96.0

Shipping

Indoor Unit

kg 49.0 49.0 62.0 62.0 80.0 80.0 80.0

Outdoor Unit

kg 48 .0 69.5 74.0 98.0 98.0 98.0 106.0

Connecting Pi pe

Liquid

mm 6.35 (1/4") 6.35 (1/4") 9. 52 (3/8") 9.52 (3/8") 9.52 (3/8") 9. 52 (3/8") 9.52 (3/8")

Gas

mm 12.7 (1/2") 15.88 (5/8") 15.88 (5/8") 15.88 (5/8") 15.88 (5/8") 15.88 (5/8") 19.05 (3/4")

Refrigerant (R410A)

g 1300 2100 2600 2800 2800 2800 3500

Additional Refrigerant (R410A)

g/m 10 10 22 33 33 33 33

Standard

m 7.5 7.5 7.5 7.5 7.5 7.5 7.5

Extension Length (Maximum)

m 3 0 50 50 75 75 75 75

Extension Length (Elevation)

m 20 30 30 30 30 30 30

Option Code

Product Option

01E06C-105020­27343B-370005

01E06C-105020-274750-

370005

01E06C-105020­275A64-370005

01E06C-105020-276470-

370005

01E06C-105020­277D8C-370005

01E06C-105020­278CA0-370005

01E06C-105020­27A0B4-370005

Installation Option

020000-100000-200000-

300000

020000-100000-200000-

300000

020000-100000-200000-

300000

020000-100000-200000-

300000

020000-100000-200000-

300000

020000-100000-200000-

300000

020000-100000-200000-

300000

2-4 Samsung Electronics

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Installation manual - 1

Essential Offer

(Indoor Unit)

Card Warranty - 1

Cap Drain DB63-10355C 3

Essential Offer
(Outdoor Unit)

Drain Plug DB67-00806A 1

Rubber Leg DB73-20134A 4

Manual Install DB68-05462A 1

2-3 Specifications of optional items

2-3-1 Accessories

Samsung Electronics 3-1

Item Remarks

+SCREW DRIVER

Adjustable Wrench

(8mm, 10mm, 13mm)

M6, M8 Hex Wrench

QNecessary Tools

3. Disassembly and Reassembly

3-2 Samsung Electronics

No Parts Procedure Remark

1 FRONT VIEW 1) Stop the operation of the air conditioner

and disconnect the main power supply.

2 Control-BOX 1) Loosen 11 of the front screw(CCW) and

detach the Cabinet Front Up.

2) Disconnect the Connector Wire that is
connected to the indoor unit's PBA

3) Unscrew the 1 fixed screws on middle of
the PBA and 4 fixed PBA HOLDER, and
disassemble the PBA from the indoor
unit.
(Use + Screw Driver)

3-1 Indoor Unit

QV-AHU

- AC018/024/030/036/042/048/054KNZDCH/AA

Disassembly and Reassembly

Samsung Electronics 3-3

No Parts Procedure Remark

3 DRAIN PAN 1) Loosen 11 of the front screw(CCW) and

detach the Cabinet Front Down.

2) Loosen 2 of the Left side screw(CCW).

3) Loosen 5 of the front screw(CCW) and
detach the 2 Bracket drain and 1 Bracket
Low

4) Pull the Heat Exchanger and Drain.

5) Detach the Drain from indoor Unit.

Disassembly and Reassembly

3-4 Samsung Electronics

No Parts Procedure Remark

4 Heat Exchanger 1) Loosen 11 of the front screw(CCW) and

detach the Cabinet Front Down.

2) Loosen 2 of the Left side screw(CCW).

3) Loosen 5 of the front screw(CCW) and
detach the 2 Bracket drain and 1 Bracket
Low.

4) Disconnect the Connector Wire that is
connected to the Heat Exchanger.

5) Pull the Heat Exchanger and Drain.

6) Detach the Heat Exchanger.

Disassembly and Reassembly

Samsung Electronics 3-5

No Parts Procedure Remark

5 FAN & MOTOR 1) Loosen 11 of the front screw(CCW) and

detach the Cabinet Front Down.

2) Loosen 6 of the Front screw(CCW) and
detach the Bracket.

3) Disconnect the Connector Wire that is
connected to the Motor.

5) Pull the A'ssy Fan Blower.

Disassembly and Reassembly

3-6 Samsung Electronics

No Parts Procedure Remark

6) Loosen 4 of the screw and 1 nut on the
CASE and Detach the motor and fan.

Disassembly and Reassembly

Samsung Electronics 3-7

No Parts Procedure Remark

1 common work 1) loosen 1 pcs screw of cover control,and

detach it.

2) loosen 5 pcs screws on both right and
left cabniet side edges and to detach the
cover-top

3) Loosen 7 screwsxed to disassemble
cabi-front , and detach it.

AC018JXADCH

3-2 Outdoor Unit

Disassembly and Reassembly

3-8 Samsung Electronics

No Parts Procedure Remark

common work 4) loosen 7 screws to disassemble the cabi-

right ,and detach it.

5) loosen 2 screws to disassemble steel-bar.

6) loosen 3 screws to disassemble cabi-left.

Disassembly and Reassembly

Samsung Electronics 3-9

No Parts Procedure Remark

2 fan&motor 1) loosen 1 screw as indication and detached

the fan.

2) loosen 4 pcs motor screws and disconnect
the wire betwwen assy control out and motor.

3) loosen 2 pcs bracket-motor screw and
detach it.

Disassembly and Reassembly

3-10 Samsung Electronics

No Parts Procedure Remark

3 assy control out 1) lossen xing 1 screw from cover -control

2) detach several connections from assy con­trol out, take out assy control out.

4 Heat exchanger 1) Release the refrigerant at rst

2) Looosen xing screw on both side.

3) disaessembly the pipes in both inlet and
outlet with welding torch.

4) detach the heat exchanger.

Disassembly and Reassembly

Samsung Electronics 3-11

No Parts Procedure Remark

5 compressor 1) disconnect the compressor lead wire .

2)disassembly the felt comp sound.

loosen the 3 bolts at the bottom of

Disassembly and Reassembly

3-12 Samsung Electronics

No Parts Procedure Remark

1 Cabi Front RH

You must turn o the Power before

disassembly.

1) Unscrew and remove two mounting screw
in the Cabinet Front RH. (Use +Screw Driver)

2 Cabi Top 1) Unscrew and remove 9 screws

on each side of the Cabinet-Top.
(Use +Screw Driver)

3 Cabi Install Front 1) Unscrew and remove 1 screw

in the Cabinet-Install Front.
(Use +Screw Driver)

AC024JXADCH, AC030JXADCH

Disassembly and Reassembly

Samsung Electronics 3-13

No Parts Procedure Remark

4 Guard Cond 1) Pull the sensor from Guard Cond.

2) Unscrew and remove 4 screws

in the Guard Cond.
(Use +Screw Driver)

5 Cabi Back RH 1) Pull the sensor from Cabi Back RH.

2) Unscrew and remove 4 screws

on each side of the Cabinet Back RH.
(Use +Screw Driver)

Disassembly and Reassembly

3-14 Samsung Electronics

No Parts Procedure Remark

6 Cabi Install Back 1) Unscrew and remove 1 screw

in the Cabinet-Install Back.
(Use +Screw Driver)

7 Cabi Front LF 1) Unscrew and remove 10 screws

in the Cabinet-Front LF.
(Use +Screw Driver)