Samsung AS18WJWB, AS18WJWD, AS18WJWE, AST18WJWB, AST18WJWE Service Manual

ROOM AIR CONDITIONER

INDOOR UNIT	OUTDOOR UNIT
AS18WJWB	US18WJWB
AS18WJWD	US18WJWD
AS18WJWE	US18WJWE
AST18WJWB	UST18WJWB
AST18WJWE	UST18WJWE
AS24W6WB	US24W6WB
AS24W6WE	US24W6WE
AST24W6WB	UST24W6WB
AST24W6WE	UST24W6WE
SC18ZWJ	SC18ZWJX
SC24ZW6	SC24ZW6X

SERVICE Manual

AIR CONDITIONER	CONTENTS
	1. Product Specifications
	2. Operating Instructions & Installation
	3. Disassembly and Reassembly
	4. Refrigerating Cycle Diagram
	5. Set Up the Model Option
	6. Troubleshooting
	7. Exploded Views and Parts List
	8. Block Diagram
	9. Wiring Diagram

1. Product Specifications

1-1 Table
			Model	AS18WJWB		AS24W6WB
				AST18WJWB		AST24W6WB
Item				Indoor unit	Outdoor unit	Indoor unit	Outdoor unit
Type				Wall-mounted		Wall-mounted
	Cooling		kcal/h(1)	4,000		5,050
			BTU/h(2)	18,000		24,000
	Dehumidifying		\/h		1.9		2.7
Perfor-	Air Volume	Cooling	m3/min	13.5	25	14.4	45
mance	Noise	Cooling	dB	45/43/41	58/58	46/44/42	61/61
	Energy Efficiency		BTU/Wh(1)	7.05		7.03
			BTU/Wh(2)	9.47		9.60
	Power		ø-V-Hz	1-220-60		1-220-60
	Power Consumption		kW	2.25(1)		2.85(1)
				1.9(2)		2.5(2)
	Operating Current		A	10.1(1)		13.2(1)
				8.8(2)		11.5(2)
Power	Power Factor	Cooling	%	98.0		98.0
	Starting Current		A		47		65
		Length	m		-		-
	Power Cord	Number of Core Wire			-		-
		Capacity	A		-		-
		Width x Height	mm	1,065 x 298 x 218	790 x 548 x 285	1,065 x 298 x 218	880 x 638 x 310
	Outer Dimension		inch	41.9 x 11.7 x 8.6	31.1 x 21.6 x 11.2	41.9 x 11.7 x 8.6	34.6 x 25.1 x 12.2
		x Depth
	Weight		kg	13	39	13	64
		Liquid	mm x L(m)	ø6.35 x 5		ø6.35 x 5
	Refrigerant Pipe		mm x L(m)	ø12.7 x 5		ø15.88 x 5
		Gas
	Drain Hose		D x L(mm)	ø18 x 2,000		ø18 x 2,000
Size		Type		Rotary		Rotary
	Compressor	Type		Induction Motor(PSC)		Induction Motor(PSC)
		Motor		1,950		2,670
		Rated Output
	Oil Type			SUNISO-4GSD		SUNISO-4GSD
		Type		Cross flow	Propeller	Cross flow	Propeller
	Blower	Type		steel	steel	steel	steel
		Motor	W	15	50	15	50
		Rated Output
Heat Exchanger				2R0W 16STEP	2ROW 24STEP	2R0W 16STEP	2ROW 28STEP
Refrigerant Control unit				CAPILLARY TUBE		CAPILLARY TUBE
Freezer Oil Capacity			cc	600			800
Refrigerant to Change(R22)			g	1,200		1,400
Protection Device(OLP)				MRA12068-12007		Internal
Cooling Test Condition				(1)INDOOR UNIT : DB29˚C WB19˚C		OUTDOOR UNIT : DB46˚C WB24˚C
				(2)INDOOR UNIT : DB27˚C WB19˚C		OUTDOOR UNIT : DB35˚C WB24˚C
Maximum Operation Condition				(2)INDOOR UNIT : DB32˚C WB23˚C		OUTDOOR UNIT : DB54˚C WB24˚C
Samsung Electronics							1

Table( cont.)

			Model	AS18WJWD
Item				Indoor unit	Outdoor unit
Type				Wall-mounted
	Cooling		kW		5.1
			BTU/h		18,000
	Dehumidifying		\/h		1.9
Perfor-	Air Volume	Cooling	m3/min	13.5	25
mance	Noise	Cooling	dB	45/43/41	58/58
	Energy Efficiency	Cooling	W/W		2.76
			BTU/Wh		9.73
	Power		ø-V-Hz	1-200/220-50
	Power Consumption	Cooling	kW		1.85
	Operating Current	Cooling	A		8.8
	Power Factor	Cooling	%		94
Power	Starting Current		A		42
		Length	m		-
	Power Cord	Number of Core Wire			-
		Capacity	A		-
	Outer Dimension	Width x Height	mm	1,065 x 298 x 218	790 x 548 x 285
		x Depth	inch	41.9 x 11.7 x 8.6	31.1 x 21.6 x 11.2
	Weight		kg	13	39
	Refrigerant Pipe	Liquid	mm x L(m)	ø6.35 x 5
		Gas	mm x L(m)	ø12.7 x 5
	Drain Hose		D x L(mm)	ø18 x 2,000
Size	Type				Rotary
	Compressor	Type		Induction Motor(PSC)
	Motor	Rated Output			1,895
	Oil Type			SUNISO-4GSD
	Type			Cross flow	Propeller
	Blower	Type		steel	steel
	Motor	Rated Output	W	15	50
Heat Exchanger				2R0W 16STEP	2ROW 24STEP
Refrigerant Control unit				CAPILLARY TUBE
Freezer Oil Capacity			cc		600
Refrigerant to Change(R22)			g		1,200
Protection Device(OLP)				Internal
Cooling Test Condition				NDOOR UNIT : DB27˚C WB19˚C	OUTDOOR UNIT : DB35˚C WB24˚C
Maximum Operation Condition				NDOOR UNIT : DB32˚C WB23˚C	OUTDOOR UNIT : DB54˚C WB24˚C
2					Samsung Electronics

Table( cont.)

Model

AS18WJWE

AS24W6WE

AST18WJWE

AST24W6WE

Item

SC18ZWJ

SC24ZW6

Indoor unit

Outdoor unit

Indoor unit

Outdoor unit

Type

Wall-mounted

Wall-mounted

Cooling

kW

5.1

6.8

BTU/h

18,000

24,000

Dehumidifying

\/h

1.9

2.7

Perfor-

Air Volume

Cooling

m3/min

13.5

25

14.4

45

mance

Noise

Cooling

dB

45/43/41

58/58

46/44/42

61/61

Energy Efficiency

Cooling

W/W

2.62

2.72

BTU/Wh

9.23

9.60

Power

ø-V-Hz

1-220/240-50

1-220/240-50

Power Consumption

Cooling

kW

1.95

2.5

Operating Current

Cooling

A

9.5

12

Power Factor

Cooling

%

97

91.4

Starting Current

A

40

82

Power

Power Cord

Length

m

-

-

Number of Core Wire

-

-

Capacity

A

-

-

Outer Dimension

Width x Height

mm

1,065 x 298 x 218

790 x 548 x 285

1,065 x 298 x 218

880 x 638 x 310

x Depth

inch

41.9 x 11.7 x 8.6

31.1 x 21.6 x 11.2

41.9 x 11.7 x 8.6

34.6 x 25.1 x 12.2

Weight

kg

13

39

13

64

Refrigerant Pipe

Liquid

mm x L(m)

ø6.35 x 5

ø6.35 x 5

Gas

mm x L(m)

ø12.7 x 5

ø15.88 x 5

Drain Hose

D x L(mm)

ø18 x 2,000

ø18 x 2,000

Type

Rotary

Rotary

Compressor

Motor

Type

Induction Motor(PSC)

Induction Motor(PSC)

Size

Rated Output

2,120

2,740

Oil Type

SUNISO-4GSD

SUNISO-4GSD

Type

Cross flow

Propeller

Cross flow

Propeller

Blower

Motor

Type

steel

steel

steel

steel

Rated Output

W

15

50

15

50

Heat Exchanger

2R0W 16STEP

2ROW 24STEP

2R0W 16STEP

2ROW 28STEP

Refrigerant Control unit

CAPILLARY TUBE

CAPILLARY TUBE

Freezer Oil Capacity

cc

600

900

Refrigerant to Change(R22)

g

1,100

1,450

Protection Device(OLP)

Internal

Internal

Cooling Test Condition

NDOOR UNIT : DB27˚C WB19˚C

OUTDOOR UNIT : DB35˚C WB24˚C

Maximum Operation Condition

NDOOR UNIT : DB32˚C WB23˚C

OUTDOOR UNIT : DB54˚C WB24˚C

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1-2 Pressure Graph

■ 18K BTU

Low Pressure Distribution(Cooling mode)

	10
		Indoor Temp.( C)
		DB32.4 / WB24.0
	8	DB30.6 / WB22.5
G)		DB27.0 / WB19.0
		DB24.0 / WB17.0
Low pressure(kg/cm
		DB21.0 / WB15.0
	6
	4
	2
	0
	25.0	35.0	45.0	55.0

Outdoor Temp.(DBC)

■ 24K BTU

Low Pressure Distribution(Cooling mode)

	10
		Indoor Temp.( C)
		DB32.4 / WB24.0
	8	DB30.6 / WB22.5
G)		DB27.0 / WB19.0
		DB24.0 / WB17.0
Low pressure(kg/cm
		DB21.0 / WB15.0
	6
	4
	2
	0
	25.0	35.0	45.0	55.0

Outdoor Temp.(DBC)

4	Samsung Electronics

2. Operating Instructions & Installation

2-1 The Feature of Key in remote control

No

BUTTON

FUNCTION

1

On/Off button.

Press the button to stop or run the air conditioner.

(UP)

Temperature adjustment button(UP).

To increase the temperature by the pressing the temperature button.

2

(DOWN)

Temperature adjustment button(DOWN).

To decrease the temperature by the pressing the temperature button.

Mode selection button.

: Auto Mode

: Dry Mode

Each time you press this button,

3

Mode is changed in the following order.

: Cool Mode

: Fan Mode

		Fan speed adjustment button.
		Each time you press this button, FAN SPEED is changed in the following order.
				Automatic(rotated :				)
4				Low
				Medium
				High
				Turbo(Maximum)
5		Flap button.
		It adjusts the airflow to upward and downward.
		Turbo button.
6		The air conditioner cools or heats the room as quickly as possible.
		After 30minutes, the air conditioner is reset automatically to the previous mode.
7		Energy saving button.
		If you wish to save energy when using your air conditioner, select the Energy saving
		mode with the		button.
		Sleep button.
8		The sleep timer can be used when you are cooling or heating your room to switch the air conditioner
		off automatically after a period of 6 hours.
		On Timer button.
		The On Timer enables you to switch on the air conditioner automatically after
9		a given period of time that is from 1 hour to 24 hours.
		To set the operating time, press the			button one or more times until the required
		time display.

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Operating Instructions & Installation

No	BUTTON			FUNCTION
		Off Timer button.
		The Off Timer enables you to switch off the air conditioner automatically after
10		a given period of time that is from 1 hour to 24 hours.
		To set the operating time, press the		button one or more times until the required
		time display.
		Timer Set/Cancel button.
11		After setting On Timer or Off Timer, press the			button to set it completely.
		And press the	button again to cancel On Timer or Off Timer set.
		Battery life indicator.
12		If you want to check the battery life, press the			button.
		The longer will remain the battery life.
		If one battery life indicator remains, replace new batteries.

6	Samsung Electronics

2-2 Details for Operation Property

1.AUTO MODE : In this mode, operation COOL mode is selected automatically by the difference between the setting and room temperature.

Operation Type		Room Temp.
Cool Operation	Tr ≥ Ts+1.0°C		Compressor ON
	Tr ≤ Ts		Compressor OFF

Ts : Setting temperature.

2.COOL MODE : The unit operates according to the difference between the setting and room temperature. (16°C~30°C)

3.DRY MODE : Has 4 states, each determined by room temperature.

The unit operates in DRY mode.

*Compressor ON/OFF time is controlled compulsorily (can not set up the fan speed, always breeze). *Protective function : Low temperature release. (Prevention against freeze)

4.TURBO MODE : This mode is available in AUTO, COOL, DRY, FAN MODE.

When this button is pressed at first, the air conditioner is operated "powerful" state for 30 minutes regardless of the setting temperature, room temperature.

When this button is pressed again, or when the operating time is 30 minutes, turbo operation mode is canceled and returned to the previous mode.

*But, if you press 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.

*In COOL mode : 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 : Fan speed automatically varies depending on both the difference between setting and the room temperature.

Can set up the fan speed in COOL,FAN mode.

7.COMPULSORY OPERATION :

For operating the air conditioner without the remote control.

*The operating is the same function that AUTO MODE in the remote control.

8.FLAP : BLADE-H is rotated vertically by the stepping motor.

*Flap 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.

9.SETTING THE ON/OFF TIMER. :

*ON TIMER : The On Timer enables you to switch on the air conditioner automatically after a given period of time. You can set the period of time from 1 hour to 24 hours.

*OFF TIMER : The Off Timer enables you to switch off the air conditioner automatically after a given period of time. You can set the period of time from 1 hour to 24 hours.

10.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 "beep".

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2-3 Installation

2-3-1 Before Installation

Keep the air conditioner drain hose outlet and inlet free from its surroundings.

In case of breakdown, keep the symmetry and fix it to prevent vibration.

The pipe length shall meet the standard as far as possible.

2-3-2 Installation Procedure

■Location

Install the product in an area to guarantee the best cooling effect, convenience of piping and electric work, and inexistence of vibration or wind in the vicinity.

■Wall Drilling

Drill the wall downward in a diameter of 60 to 65mm.

■Fixing Indoor Unit & Outdoor Unit

Fix the air conditioner hard enough so that it can not fall to the ground. On the roadside, the outdoor unit shall be installed 2m above ground and kept away from pedestrians to prevent direct exposure to hot wind.

■Pipe Spooling & Connecting

You shall cut the pipe straightly with a pipe cutter and grind all the burrs of the cut surface. Pipe expansion may continue until the pipe surface becomes uneven or torn apart.

Be sure to use a torque wrench to tighten pipes or flare nuts.

	<Torque & Depth>
Outer Diameter(D)	Torque(kgf.cm)	Depth(A)	D
6.35mm(1/4")	140~170	1.3mm	A
12.70mm(1/2")	380~420	2.0mm
15.88mm(5/8")	440~480	2.2mm

■Leak Test

Put an inert gas like nitrogen in the outdoor unit pipe and put soap bubbles or other test liquids on the pipe surface for the leak test.

■Drain Hose Connecting

Install the drain hose downward to drain water naturally. Be sure to pour water into the hose to check if it drains well.

■Electric & Earth Work

Electric and earth work shall meet the "Electric Facility Technology Standard" and the "Internal Wire Regulation" of the Electric Business Laws.

■Inspection & Trial Run

Upon completion of the tests, you shall make a trial run while you explain the main functions of the air conditioner to finish the installation.

8	Samsung Electronics

2-4 Installation Diagram of Indoor Unit and Outdoor Unit

1)Connect each assembly pipe to the appropriate valve on the outdoor unit and tighten the flare nut.

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)Open the valve of the low pressure side of manifold gauge counter-clockwise.

4)Purge the air from the system using vacuum pump for about 30 minutes.

-After that, please recheck that pressure is stabilization.

-Close the valve of the low pressure side of manifold gauge clockwise.

-Remove the hose of the low pressure side of manifold gauge.

5)Set valve cork of both liquid side and gas side of packed valve to the open position.

6)Mount the valve stem nuts to the 2-Way and 3-Way valve. And mount the service port cap to 3-Way valve.

7)Check for gas leakage.

-At this time, especially check for gas leakage from the 3-Way valve’s stem nuts, and from the service port cap.

Outdoor unit

A

B

A (gas)

B (liquid)

Indoor unit

Gas pipe side C

Liquid pipe side D

Vacuum Pump

Valve stem

Stem cap

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Operating Instructions & Installation

2-4-2 Refrigerant Refill(R22)

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.

3)Connect the tank to refill with refrigerant.

4)Set the unit to cool operation mode.

5)Check the pressure indicated by the pressure gauge(low pressure side).

*Standard pressure is should be 4.5~5.5kg/cm2 in a regular, high operation mode.

6)Open the refrigerant tank and fill with refrigerant until the rated pressure is reached.

*It is recommended not to pour the refrigerant in too quickly, but gradually while operating a pressure valve.

7)Stop operation of the air conditioner.

8)Close the 3-Way valve, disconnect the pressure gauge, and open the 3-Way valve again.

Compound gauge

For mounting other and of hose when not in use

9) Close the cap of each valve.

Suspension hook

High pressure gauge

Hand wheel

Finger tight fittings

Connected to high pressure side

Charging line

R22

10	Samsung Electronics

Operating Instructions & Installation

2-4-3 "Pump down" Procedure

Pump down will 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. (Check if the compressor is operating.)

4)Turn the 2-Way valve clockwise to close.

5)When the pressure gauge indicates "0" turn the 3-Way valve clockwise to close.

6)Stop operation of the air conditioner.

7)Close the cap of each valve.

3-Way Valve

2-Way Valve

Relocation of the air conditioner

•Refer to this procedure when the unit is relocated.

•Carry out the pump down procedure (refer to the details of 'pump down').

•Remove the power cord.

•Disconnect the assembly cable from the indoor and outdoor units.

•Remove the flare nut connecting the indoor unit and the pipe.

•At this time, cover the pipe of the indoor unit and the other pipe using a cap or vinyl plug to avoid foreign material entering.

•Disconnect the pipe connected 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.

•Make sure you do not bend the connection pipes in the middle and store together with the cables.

•Move the indoor and outdoor units to a new location.

•Remove the mounting plate for the indoor unit and move it to a new location.

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3. Disassembly and Reassembly

Stop operation of the air conditioner and remove the power cord before repairing the unit.

3-1 Indoor Unit

No	Parts	Procedure	Remark
1	Front Grille	1) Stop the air conditioner operation and
		shut off the main power.

2)Open the Front Grille by pulling right and left sides of the hook.

3)Loosen 1 of the right screw and detach the Terminal Cover.

4)Detach the thermistor from the Front Grille.

5) Loosen 3 fixing screws of Front Grille.

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Disassembly and Reassembly

No

Parts

Procedure

Remark

6)Unlock 3 hooks to fix Panel Front and Tray Drain.

7)Unlock 3 hooks to fix Panel Front and Back-Body.

2	Control-In	1)	Take all the connector of PCB upper side
	(Main PCB)		out. (Inclusion Power Cord)
		2)	Detach the outdoor unit connection wire
			from the Terminal Block.
		3)	Loosen 4 fixing screws of Ass'y Control-In.

3

Tray Drain

1) Pull Tray Drain out from the Back Body.

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Disassembly and Reassembly

No	Parts		Procedure	Remark
4	Heat Exchanger	1)	Loosen 2 fixing earth screws of right side.
		2)	Detach the Connection Pipe.
		3)	Detach the Holder Pipe at the rear side.

4)Loosen the 4 fixing screws of right and left side.

5)Lifting the Heat Exchanger up a little to push the up side for separation from the indoor unit.

5	Fan Motor	1)	Loosen the fixing screw.
	&	2)	Detach the Fan Motor from the Fan.
	Cross Fan	3)	Detach the Fan From the left Holder
			Bearing.

14	Samsung Electronics

3-2 Outdoor Unit

■ 18K BTU

No	Parts	Procedure	Remark
1	Common Work	1) Loosen the fixing screw of the
		Cover Control.

2)Loosen the fixing screws on right and left, back Cabinet-Side edge and a fixing screw on the Cabinet-Front lower to detach the Cabinet-Front.

3)Loosen the fixing screws of the Ass'y-Control Out.

4)Loosen the fixing screws of the Cabinet-Side RH.

5)Loosen the fixing screws of the Cabinet-Side LF.

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Disassembly and Reassembly

No	Parts		Procedure		Remark
2	Fan & Motor	1) Detach the Nut Flange.(Turn counterclock-
			wise because the screw is right-handed)
		2)	Detach the Fan.
		3)	Loosen 4 fixing screws to detach
			the Motor.
3	Heat Exchanger	1) Loosen 3 fixing screws of the Bar Steel.
		2)	Loosen 2 fixing screws on both sides.
		3)	Disassemble the pipe in both inlet and
			outlet with welding torch.
		4)	Detach the Heat Exchanger.
4	Compressor	1) Loosen the Terminal Cover nut to open the
			Terminal Cover.
		2)	Disassemble the cloth sound felt.
		3)	Disassemble the pipe in both inlet and
			outlet of the Compressor with welding
			torch.
		4)	Loosen the 3 bolts at the bottom.
		5)	Detach the Compressor.

16	Samsung Electronics

Disassembly and Reassembly

■ 24K BTU

No	Parts	Procedure	Remark
1	Common Work	1) Loosen the fixing screw of the Cover
		Control.

2)Loosen the fixing screws of the Cabinet-Upper.

3)Loosen the fixing screws of the Cabinet-Side RH.

4)Loosen the fixing screws of the Cabinet-Side LF.

5)Loosen the fixing screws of the Ass'y Control Out.

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