Samsung MC26AC2X Service manual

DB98_11868A(1)_cover 3/3/03 11:16 AM Page 3

ROOM AIR CONDITIONER

INDOOR UNIT

MC26AC2-07

MC26AC2-12

OUTDOOR UNIT

MC26AC2X

SERVICE Manual

AIR CONDITIONER

1. Precautions

CONTENTS

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_11868A(1)_1 3/3/03 11:17 AM 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.

4. Power Cord: Prior to repair, check the power cord and replace it if necessary.

5. Avoid using an extension cord, and avoid tapping 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 conditions are satisfactory.

Relocate the unit if necessary.

9. Keep children away from the unit while it is being repaired.

10. Be sure to clean the unit and its surrounding area.

Fig. 1-1 Avoid Dangerous Contact

Fig. 1-2 No Tapping and No Extension Cords

Fig. 1-3 No Kids Nearby!

Samsung Electronics

Fig. 1-4 Clean the Unit

1-1

DB98_11868A(1)_1 3/3/03 11:17 AM Page 1-2

M E M O

1-2 Samsung Electronics

DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-1

2. Product Specifications

2-1 Table

Model

Item

Type

Cooling

Performance

Power

Dehumidifying

Air volume

Noise

Power

Power Consumption

Operating Current

Starting Current

Power Cord (Option)

Connection Cable (Option)

Fuse Capacity

Outer

Dimension

Weight

W x H x D

Refrigerant pipe

Liquid

Gas

Drain hose

Type

A mm inch kg

OD(mm)xL(m)

OD(mm)xL(m)

OD(mm)xL(m) kW

BTU/h

Kcal/h

\ /h m 3 /min dB

ø-V-Hz

W

A

A

Size Model name

Compressor

Capacitor

Blower

Motor

Type

Rated output

Type

Motor

Type

Rated output

Heat exchanger

Refrigerant control unit

Freezer oil capacity

W

W cc

Refrigerant to charge(R410A)

Protection device

Cooling test condition

Maximum operation condition

INDOOR UNIT

MC26AC2-07

2.05 x 2

6,995 x 2

1,763x2

0.9

6

39

1,250

5.5

3.15

790 x 245 x 165

31.1 x 9.64 x 6.50

7.7

ø6.35 x 5

MC26AC2

INDOOR UNIT

MC26AC2-12

Wall-Mounting Multi Split

3.5

11,942

3,009

1.5

8

42

1-220-240V~, 50Hz

1,210

5.4

30

2.5 x 3core

1.0 x 4core

3.15

790 x 245 x 165

31.1 x 9.64 x 6.50

7.7

ø6.35 x 5

OUTDOOR UNIT

MC26AC2X

7.6

25,932

6,535

-

-

60

2,460

10.9

-

880 x 638 x 310

34.65 x 25.1 x 12.2

60

-

ø9.52 x 5

ø18.0 x 2

-

-

-

ø9.52 x 5

ø18.0 x 2

-

-

-

-

-

Rotary

A : G8C124JU1EL

B : G8C124JU1EL

A : 35µF 450VAC

B : 35µF 450VAC

-

-

Resin

Cross-flow

22

2Row 12Step

-

-

Resin

Cross-flow

22

2Row 12Step

A/B-Unit : Capillary tube

A : 1,060, B : 1,060

Steel

Propeller

74

2Row 36Step

-

A : 500

B : 500

A-Unit : 920g, B-Unit : 970g

-

A : RAC12128-9622

B : RAC12128-9622

Indoor unit : DB27˚C WB19˚C Outdoor unit : DB35˚C WB24˚C

Indoor unit : DB32˚C WB23˚C Outdoor unit : DB43˚C WB26˚C

Samsung Electronics 2-1

DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-2

2-2 Dimensions

2-2-1 Indoor Unit

(Unit : mm)

Air out

Air in

(Front view)

790

165

(Remote control)

45 22

Installation plate


DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-3

2-2-2 Outdoor Unit

(Front view)

660

1000 340

(Rear view)

Product Specifications

(Unit : mm)


DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-4

2-3 Pressure Graph

■ MC26AC2-07

■

11

10

9

8

7

20 30

Outdoor drybulb temperature [deg C]

30.6/22.5

27/19

21.5/14.6

40

■ MC26AC2-12

■

10

9

8

7

6

20

30.6/22.5

27/19

21.5/14.6

30

Outdoor drybulb temperature [deg C]

40


DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-5

3. Operating Instructions and Installation

3-1 Operating Instructions

3-1-1 The Feature of Key in remote controller

NO

1

NAMED OF KEY

FUNCTION OF KEY

Power On/Off button to start and stop airconditioner or timer set up.

2

3

(UP)

(DOWN)

Temp. up button. To increase the temperatute by the pressing the temperature button.

Temp. down button. To decrease the temperature by the pressing the temperature button.

Each time you press this button

Mode is changed in the following order : Auto Mode

: Cool Mode

: Dry Mode

: Fan Only

4

Press until the appearance. The air condition cools the room as quickly as possible. After 30minutes, the air, the airconditioner is reset automatically to the previous mode.

Press until the appearance. The sleep timer can be used when you are cooling your room to switch the air conditioner off automatically after a period of six hours.

Each time you press this button,

FAN SPEED is changed in the following order.

5

6

7

8

Adjust air flow vertically.

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 the (Set/Cancel) button.

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.

To select the 5 way function with the remote control, press the 5 way button one or more times until the desired mode is selected.

Each time you press the 5 way button.

9

Each 5 way indicator on the indoor unit comes on in order.


DB98_11868A(1)_1 3/3/03 11:17 AM 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

Tr<24°C+

∆

T

Compressor ON

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. COOL MODE : The unit operates according to the difference between the setting and room temperature.

(18°C~30°C)

3. DRY MODE : Has 3 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 set 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 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 automatically varies depending on both the difference between setting and the room temperature.

7. COMPULSORY OPERATION :

For operating the air conditioner without the remote controller.

*AUTO : The operating is the same function that AUTO MODE in the remote controller. And each time you press the button the 5WAY function is changed as follow. STD ➝ NATURE ➝ POWER ➝

SAVING ➝ SILENCE ➝ POWER OFF

❊ STD(standard)( ) : General operation Mode

❊ NATURE( ) : The unit is operated according to health pattern control

❊ POWER( ) : The unit is operated in powerful state

❊ SAVING( ) : The unit is operated in power saving state

❊ SILENCE( ) : The unit is operated quietly

Each mode has Auto, Cool and SLEEP operation designed in advance.


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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.

9. 24-Hour ON/OFF Real Setting Timer. :

The 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

Check Point

LED DISPLAY

STD NATURE POWER SAVING SILENCE TIMER

Indoor unit room temperature sensor error(open or short)

Indoor unit heat exchanger temperature sensor error(open or short)

Indoor fan mal function

EEPROM error

Option error(option wasn’t set up or option data error)

: LED blinking : LED off

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 "beep".


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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.

3. Make sure that you install the indoor unit in an area where there is no source of heat or vapor nearby.

4. Make sure that you install the indoor unit in an area from which hot or cool air is spread evenly in a room.

5. Make sure that you install the indoor unit in an area away from TVs, audio units, cordless phones, fluorescent lighting fixtures and other electrical appliances

(at least 1 meter).

6. Make sure that you install the indoor unit in an area which provides easy pipe connection with the outdoor unit, and easy drainage for condensed water.

7. Make sure that you install the indoor unit in an area which is large enough to accommodate the measurements shown in figure on the next page.

3-2-1(b) Outdoor Unit

1. Make sure that you install the outdoor unit in area not exposed to the rain or direct sun 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 neighbours.

(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 by any obstacle affecting the airflow near the air inlet and the air outlet.

4. Make sure that you install the outdoor unit in area free from animals or plants.

5. Make sure that you install the outdoor unit in area not blocking the traffic.

6. Make sure that you install the outdoor unit in area easy to drain condensed water from the indoor unit.

7. Make sure that you install the outdoor unit in area which provides easy connection within the maximum allowable length of a coolant pipe(10 meters).

Note

1. Add 10 grams of refrigerant (R410A) for every

1 meter if the pipe length exceeds the standard pipe length of 5 meters.

2. Maintain a height between the indoor and outdoor units of less than 3 meters.

8. Make sure that you install the outdoor unit in an area which is large enough to accommodate the measurements shown in figure on the next page.

3-2-1(c) Remote Control Unit

1. Make sure that you install the remote control unit in an area free from obstacles such as curtains etc, which may block signals from the remote control unit.

2. Make sure that you install the remote control unit in an area not exposed to direct sunlight, and where there is no source of heat.

3. Make sure that you install the remote control unit in an area away from TVs, audio units, cordless phones, fluorescent lighting fixtures and other electrical appliances (at least 1 meter).

Caution :

It is harmful to the air conditioner if it is used in the following environments: greasy areas (including areas near machines), salty areas such as coast areas, areas where sulfuric gas is present such as hot spring areas. Contact your dealer for advice.


DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-9

B Drain hose installation


3-2-2 Installation diagram of indoor unit and outdoor unit

A Indoor unit gas leak test check point

Indoor unit

Piping

1

3

2

Tape vinyl

Piping may be laid to the rear, left, right or down .

Right

Rear

Down Rear

Left

125mm or more

Cut the piping hole sloped slightly

6

5

125mm or more

B

A 7

Remote control

100mm or more

600mm or more

4

100mm or more

Outdoor unit check point

A-UNIT

B-UNIT

10

Samsung Electronics

1

2

3

4

5

Piping (Liquid) 1/4"

Piping (Gas) 3/8"

Installation tube

Vinyl tape

Putty

6

7

8

9

10

Clamper tube

Installation plate

Pipe-connection

Screw

Drain hose

3-5

DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-10


3-2-2(a) Fixing the Installation Plate

(Unit : mm)

252

Installation plate

Pipe hole

(ø65mm)

275

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.

2. If you are fixing the indoor unit to a… Then follow

Steps…

Wall

Window frame

3.

4 to 6.

3. Fix the installation plate to the wall in a manner appropriate to the weight of the indoor unit.

If you are mounting the plate on a concrete wall with anchor bolts, the anchor bolts must not project by more than 20mm.

90 140

(Unit : mm)

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.

3-2-2(b) Purging the Unit

On delivery, the indoor unit is loaded with an inert gas. All this gas must therefore be purged before connecting the assembly piping. To purge the inert gas, proceed as follows.

Unscrew the caps at the end of each pipe.

Result : All inert gas escapes from the indoor unit.

• To prevent dirt or foreign objects from getting into the pipes during installation, do NOT remove the caps completely until you are ready to connect the piping.


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3-2-2(c) Connecting the Assembly Cable.

Indoor unit

1 2 3 E Earth terminal

Outdoor unit

1

1

(L)

2 3

2

(N)

3

COM

Earth terminal

E

E

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. Remove the screw securing the connector cover.

4. Pass the assembly cable through the rear of the indoor unit and connect the assembly cable to terminals N1 to 1.

• Each wire is labelled with the corresponding terminal number.

5. Firmly fix the ass’y cable with clamp wire holder.

6. Pass the other end of the cable through the 65mm hole in the wall.

7. Replace the connector cover, carefully tightening the screw.

8. Close the front grille.

9. For further details on how to plug the other end of the assembly 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 condensation 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.

The hose must

NOT slope upwards.

The end of the drain hose must NOT be placed in water.

Do NOT bend the hose in different directions.

To install the drain hose, proceed as follows.

5cm less

Keep a clearance of at least 5cm between the end of the hose and the ground.

Do NOT place the end of the drain hose in a hollow.

1. If necessary, connect the 2-metre extension to the drain hose.

2. If you are using the extension, insulate the inside part of the extension drain hose with a shield.

3. Pass the drain hose under the refrigerant piping, taking care to keep the drain hose tight.

4. Pass the drain hose through the hole in the wall, making sure that it is sloping downwards, as shown in the illustrations above.

Shield

The hose will be fixed permanently into position once the whole installation has been tested for gas leaks;

Drain hose Extension drain hose


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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.

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 therminals A to B.

√ Each wire is labelled with the corresponding terminal number.

√ Ensure the wire number of the indoor unit and the terminal number of the outdoor unit.

3 Connect the earth wires to the earth terminals.

√ Refer to the page opposite for further details on how to check that earthing is correct.

4 Replace the terminal board cover, carefully tightening the screw.

5 Connect the power cable to the auxiliary circuit breaker.

Outdoor unit

Terminal Block

3

COM

1

(L)

2

(N)

3

COM

3

COM

2

(N)

1

(L)

2

(N)

Indoor Unit

MC26AC2-12

MC26AC2-07

A B

E

Earth terminal

Circuit Breaker

(Main Power cable)

Outdoor Unit

MC26AC2X

1 2 3 5

Earth terminal

1 2 3

Assembly cable

1 2 3

Indoor unit 1 2 3

A-unit

MC26AC2-12

5 1 2 3

Earth terminal

1 2 3

B-unit

MC26AC2-07

5

Earth terminal

1 2 3 5

Earth terminal

5 1 2 3

Earth terminal

1 2 3

C-unit

MC26AC2-07

5

Earth terminal


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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 larger<solid wire>or 2mm 2 or larger <standard wire>)

Terminal used exclusively for grounding

Grounding resistance: less than 100 ohms

(existing grounding electrode)

Grounding screw hole

2. Use of a grounding electrode.

• Specifications of grounding electrode.

Carbon plastic Steel core

PVC-insulated wire(2mm 2 x3.5m), green Terminal, M4


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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.

Outdoor unit

A

B

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 staloilization.

- 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.

6. And mount the service port cap to 3-way valve.

Valve stem

B

(liquid)

A

(gas)

Indoor unit

Gas pipe side C

Liquid pipe side D

Vacuum Pump

Stem cap

3-10

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.

Samsung Electronics

DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-15


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.

3. Connect the tank to refill with Refrigerant

4. Set the unit to Low pressure checking mode.

* Press the ON/OFF switch for 5 second.

* All lamps blink on the indoor unit.

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

* Refer to Low pressure graph.

Compound gauge

For mounting other end of hose when not in use

INDOOR

A-UNIT

INDOOR

B-UNIT

INDOOR

C-UNIT

Suspension hook

High pressure gauge

Hand wheel

Finger tight fittings

Connected to high pressure side

Vacuum pump

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.

R410A

7. Stop operation of the air conditioner.

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

9. Close the cap of each valve.


DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-16


3-2-2(h) Refrigerant Adjustment

Class

Connection

Pipe Length

Air-Purge

Method

For installation

Refrigerant

Adjustment

5m Max.

5~10m

Refer to the detailed Air-Purge

Procedure

Unnecessary

Add 10g of refrigerant

R410A(Add as liquid state) for every 1m.

Air-Purge

Method

Purge air using a vaccum pump

For service

Refrigerant

Quantity refer to specification sheet

Add 10g of refrigerant

R410A(Add as liquid state) for every 1m.

3-2-2(i) Flare nut fixing torque

Outer diameter

ø 6.35 (Liquid Side)

ø 9.52 (Gas Side)

ø 12.7 (Gas Side)

Torque (kg-cm)

Fixing Torque Final Torque

160 200

300 350

500 550


DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-17


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-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-Way Valve

3. Set the unit to cool operation mode.

(Check if the compressor is operating.)

4. Turn the 2-way valve clockwise to close.

Valve Stem

(liquid)

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

(gas)

2-Way Valve

3-Way Valve

Stem cap

6. Stop operation of the air conditioner.

7. Close the cap of each valve.

Relocation of the air conditioner

• Refer to this procedure when the unit is relocated.

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

2. Remove the power cord.

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

4. 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.

Relocation of the air conditioner

5. 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.

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 locatioon.

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


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M E M O


DB98_11868A(1)_1 3/3/03 11:17 AM 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

1

Parts Procedure

Front Grille 1) Stop the air conditioner operation and block the main power.

2) Separate tape of front panel upper.

Remark

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.

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.

Samsung Electronics

8) Pull softly the lower part of discharge and push it up.

Caution;

Assemble the front panel and fix the hooks of left and right.

4-1

DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-20

Disassembly and Reassembly

No

2

3

Parts

Ass’y Tray

Drain.

Electrical Parts

(Main PCB)

Procedure

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.

1) Do “1”, “2” above.

Separate the drain hose from the extension drain hose.

2) Pull tray drain out from the back body.

4 Heat

Exchanger

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.

5 Fan Motor and

Cross Fan

1) Do “1”, “2”, ”3”, “4” above.

2) Loosen the fixing two screws and separate the motor holder.

3) Loosen the fixing screw of fan motor.

(By use of M3 wrench)

4) Separate the fan motor from the fan.

5) Separate the fan from the left holder bearing.

Remark


DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-21

4-2 Outdoor Unit

No

1

Parts

Cabinet

Procedure

1) Turn off the unit and remove the power cable.

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.

2) Remove the nut flange.

(Turn to the right to remove as it is a left turned screw)

3) Disassemble the propeller fan.

Remark


DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-22

M E M O


DB98_11868A(1)_1 3/3/03 11:17 AM 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.

Otherwise the airconditioner may not operate properly.

3) When a problem occurs due to the contents illustrated in the table below it is a symptom not related to the malfunction of the airconditioner.

NO Operation of air conditioner

1 The STD operation indication LED blinks when a power plug of the indoor unit is plugged in for the first time.

2 In a COOL operation mode, the compressor does not operate at a room temperature higher than the setting temperature that the IN DOOR FAN should operate.

Explanation

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

3 minutes, the indoor fan is adjusted automatically with reference to a temperature of the air blew.

3 Fan speed setting is not allowed in AUTO or DRY mode.

4 Compressor stops operation intermittently in DRY mode.

The speed of the indoor fan is set to LL in DRY mode.

Fan speed is 5 steps is selected automatically in AUTO mode.

Compressor operation is controlled automatically in DRY mode depending on the room temperature and humidity.

5 Timer LED only of the indoor unit lights up and the air conditioner does not operate.

Timer is being activated and the unit is in ready mode.

The unit operates normally if the timer operation is cancelled.

6 The compressor stops intermittently in a COOL mode or DRY mode, and fan speed of the indoor unit decreases.

The compressor stops intermittently or the fan speed of the indoor unit decreases to prevent inside/outside air frozen depending on the inside/outside air temperature.

4) Indoor unit observes operation condition of the air conditioner, and displays self diagnosis details on thedisplay panel.

NO Display

1 STD LED blinking (1Hz)

2 TIMER LED blinking (1Hz)

3 STD and TIMER LED blinking (1Hz)

4 BIO LED blinking (1Hz)

5 STD, BIO and TIMER LED blinking(1HZ)

6 All LED blinking(1HZ)

Self Diagnosis

Restore from power failure (input initial power)

Indoor unit Room sensor Error (open or short)

Indoor unit heat exchanger temperature sensor Error (open or short)

Indoor fan malfunctioning (for speed is Below 450rpm)

EEPROM Error

Option Error (option wasn’t setup or option data error)


DB98_11868A(1)_1 3/3/03 11:17 AM 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. 5 seconds

Replace

YES

PCB display

•Check linkage between power cord and terminal tap

•Check fuse

Is 325VDC appear in the secondary side (+, -)

NO of “BD71”

YES

NO

Is DC voltage of PCB display normal?

NO

Is rating voltage ±10% range applied to the primary side(~,~) of the “BD71”

NO

NO

Is operation lamp blinking?

YES

Does operation start when

ON/OFF button on the remote controller unit pushed?

NO

Is transmission display of the remote controller unit blinking?

YES

Is "beep"sound heard from the main unit?

YES

Is DC voltage of the PCB module normal?

YES

Are voltages of #33 (compressor), of the micom normal? 5VDC

Is voltage of #32 (indoor fan) of the micom normal?

DC5V

Replace

SMPS PARTS

NO

Is voltage at #10 terminal of the Micom normal?

0VDC

Is voltage at #9 terminal of the Micom normal?

5VDC

YES NO

YES

NO

NO

YES

Normal

Refer to remote control unit fault diagnosis

Replace PCB module.

Are voltages at RY71(Compressor) normal?

DC12V Is voltage at SS71(indoor fan)

YES

Check connections compressor and indoor fan.

NO

Replace

RY71 and SS71

Is voltage at #3 terminal of the micom normal?

Is output voltage of ICO2 normal?

YES NO

Check PCB pattern.

Replace main PCB.

Replace ICO2

10ms

YES NO

Is voltage output terminal of

PC814(PC02) normal?

NO

Are voltage at #11 and #12 of the micom normal?

YES NO

Replace resonator (X301)

YES

Is operation normal?

OK Replace PC814(pc02)

NO Replace micom

YES

250ns

OK


DB98_11868A(1)_1 3/3/03 11:17 AM Page 4-1

Troubleshooting

5-2-2 When the power is not applied(Outdoor unit)

(1) Is the voltage of the power normal? (The rating voltage ±10% range)

(2) Is the power line in good contact?

(3) Are the primary (CN71) and secondary (CN11) connectors of the power trans in good contact?

(4) Is the power voltage of the IC01 (KA7812) normal? (DC11.5V~DC12.5V)


Turn off the power, and then turn on the power in five minutes.

YES

Does the power of the IC01(KA7812) match with the voltage of DC12V?

YES

Is the F701(3.15A) fuse blown?

YES

Is the secondary voltage of the trans normal?

(AC15V~AC25V)

NO

NO

NO

YES

Is the first voltage of the trans normal?

the rating voltage ±10% range

NO

YES

Is the rectifying diode(D101~D104) normal?

YES

Is the voltage at both ends of the C102 electrolytic condenser in the range of DC16~DC25V?

Is the voltage at both ends of the C104 electrolytic condenser DC12V?

NO

NO

YES

Is the IC01(KA7812) normal?

End

YES

NO

Normal operation

Replace the fuse

Replace the trans

Replace the trans

Check and replace the rectifying diode

Replace the C102 and C104.

Replace the IC01


DB98_11868A(1)_1 3/3/03 11:17 AM Page 4-2

Troubleshooting

5-2-3 When the Indoor Unit Fan Does Not Operate. (Initial Diagnosis)

1) Checklist :

(1) Is the indoor unit fan motor properly connected with the connector (CN72)?

(2) Is the AC voltage correct?

(3) Is HALL IC in indoor fan motor properly connected with the connector (CN42)?

(4) Is the running capacitor (CR71) properly connected with PCB board?


After unplugging out the power cord should be reconnected within five seconds.

YES

Does the STD lamp(Green) blink?

YES

NO Check as in the procedure “NO power parts”

Refer to page 5-2.

Does the Solid State Relay(SS71) work properly?

Test rod location

Normal

Voltage

+ -

SS71SS71-

YES

12V

NO

Microcomputer is out of order.

Is the supply voltage of the fan motor sufficient?

Test rod location

Normal voltage

PCB CN72 Condition pin #3 and #5 about AC 180V Fan operate

YES

NO PCB is out of order.

MF-C is out of order

PCB should be replaced.

Replace MFC

Fan motor is out of order.

Fan motor should be replaced.


DB98_11868A(1)_1 3/3/03 11:17 AM Page 4-3

Troubleshooting

5-2-4 When the Outdoor Unit Does Not Operate. (Initial Diagnosis)

1) Checklist :

(1) Is input voltage normal? (The rating voltage ±10% range)

(2) Is the set temperature of the remote control higher than room temperature in COOL mode?

(3) Is the POWER IN connector (terminal-tab) linked correctly?

(4) Is the outdoor unit properly connected with the TERMINAL BLOCK connector(5P)?


(1) Checking procedures for the indoor unit.


Does the operating lamp blink

YES

Does the timer lamp blink during operation ?

NO

NO

YES

Check as in the procedure "No Power parts"

Refer to page 5-2.

Room temperature sensor is out of order

@ PCB should be checked.

Is the power relay RY71 operated by adjusting the room temperature?

NO !

Test rod location

+ -

Normal

IC1 Pin No.63

IC1 Pin No.62

GND

GND

NO

RY73 ON

RY72 ON

DC 4.8V

DC 4.8V

1) Is the rating voltage ±10% range applied relay between

Terminal Tap(TB71) and RY 71 terminal No #

2) Is the rating voltage ±10% range applied relay between

Terminal Tap(TB71) andCN 71 terminal No !

YES #

YES


Power relay is out of order

PCB should be checked.

Power relay should be replaced.

A Room operation

“A”Compreessor or outdoor fan-motor replaced

! NO

@ NO

Is the room sensor normal register?

10°C

17.96k

Ω

20°C

12.09k

Ω

YES #

30°C

8.3k

Ω

B Room or C Room operating

Proceed to the checking points for the outdoor unit.


DB98_11868A(1)_1 3/3/03 11:17 AM Page 4-4

Troubleshooting

(2) Procedures for checking the outdoor unit.

Turn off the power, and then turn on the power in 5 seconds.

YES

Does the compressor operate in 2 minutes after the relay (RY71) is activated at the indoor unit after 3 minutes?

YES

Does the photo coupler (IC02, IC03) corresponding to the indoor units (B & C) operate?

YES

NO

NO

Normal

Check and replace the relevant

IC (IC02, IC03).

Is the DC voltage applied to both ends of the C901?

(1) Is the voltage DC6V when either of the indoor units (B & C) is turned on?

(2) Is the voltage DC8V when both of the indoor units are turned on?

YES

NO

• Check and replace the resistance

(R901, R928, R931) and diode (D907, D908).

• Check and replace the electrolytic condenser (C901)

(1) Does the N01 pin output of the IC04 maintain "Low"?

(2) Does the N014 pin output of the IC04 maintain "High"?

When either of the indoor units (B & C) is turned on.

(3) Does the N014 pin output of the IC04 maintain "Low"?

When both of the indoor units (B & C) is turned on.

NO

YES

(1) Is the NO3 pin voltage of the IC04 DC5V?

(2) Is the NO12 pin voltage of the IC04 DC7V?

NO

• Check and replace the

IC04.

• Check and replace the resistance.

(R902, R903,R905, R906)

Does the No7 pin output of the IC04 maintain "Low"?

YES

NO

Is the No.5 pin voltage of the IC04 DC5V?

NO Check and replace the

R913, R915 and IC04.

Is the voltage at both ends of the C903 DC10V?

YES

NO Check and replace the

R911, D901, and C903.

Are the Q901, and 904 in "Turn-off" condition?

Are the Q902, Q903 and Q905 in "Turn-on" condition?

YES

Does the operation of the Q701 lead to activation of the compressor relay (RY71)?

YES

Replace the "B" compressor.

NO

NO

Check and replace each transistor

Check and replace the Q701 and relay.

(Resistance at both ends of the relay: About 150)


DB98_11868A(1)_1 3/3/03 11:17 AM Page 4-5

Troubleshooting

5-2-5 When the Outdoor Unit Does Not Operate. (Initial Diagnosis)

1) Checklist :


(2) Is the set temperature of the remote control higher than room temperature in COOL mode?

(3) Is the POWER IN connector (CN71) linked correctly?

(4) Is the outdoor unit properly connected with the TERMINAL BLOCK connector((N1), 1)?



Does the STD lamp blink

YES

Does the timer lamp blink during operation ?

NO

#

NO

YES !

Check as in the procedure "No Power parts"

Refer to page 5-2.

Room temperature sensor is out of order

@


Is the power relay RY71 operated by adjusting the room temperature?

NO

Test rod location

+ - Condition

Normal

Voltage

IC4 Pin No.33 GND RY71 ON DC 4.8V

NO



Is rating voltage ±10% range applied relay between Terminal block

NO(N1) and No !

YES

Power relay is out of order

10°C

17.96k

Ω

!

YES NO

@

Is the room sensor normal register?

20°C

12.09k

Ω

YES

#

30°C

8.3k

Ω

Outdoor unit is out of order.

Power relay should be replaced.


DB98_11868A(1)_1 3/3/03 11:17 AM Page 4-6

Troubleshooting

5-2-6 When the UP/DOWN Louver Moter Does Not Operate. (Initial Diagnosis)

1) Checklist :


(2) Is the UP/DOWN louver motor properly connected with the connector (CN61)?


Remove power cord and plug in again in approx. 5 seconds.

Is STD lamp blinking?

YES

Does operation start when swing button of the remote control unit pushed?

NO

Voltage at pin #58 ~ #61 of micom (ICO4) change?(Squarewave)

YES

Volatge at pin #13 ~ #16 of IC06 (ULN2003AFW) change?(Squarewave)

YES

UP/DOWN louver motor is faulty.

NO

Check as in the procedure "No Power parts".

Refer to page 5-2.

YES

Normal

NO

NO

Micom (IC04) is faulty.

Driver IC06 (ULN2003AFW) is faulty.

5-2-7 In the mode, When there is no cool air current. Check this first;

(1) Is the set temperature of Remote Control lower than room temperature in Cool mode?

(2) Is the Indoor PCB properly connected with the CN71 connector?

After training on, the Cooling operation should start in five minutes.

NO

Is the number #33 of Micom (IC04) DC 5.0 V?

YES

Is the number checking #10 of IC06 (ULN2003AFW) LOW?

YES

NO

NO

Normal

Abnormal Micom

Abnormal IC06

RY01 or Cable Check.

5-8

PCB should be replaced.

Samsung Electronics

DB98_11868A(1)_1 3/3/03 11:17 AM Page 4-7

Troubleshooting

5-2-8 If Operation By Remote Control Unit Is Impossible. (Initial Diagnosis)

Remove power cord and plug in again approx. 5 Seconds

Is operation lamp blinking?

YES

“ “ sound heard from the indoor unit when ON/OFF button on the remote control unit pushed?

NO

Voltage of battery less than 2.5V (Remote Control Unit)?

NO

LCD display status of REMOCON normal?

YES

Transmission display lamp ( ) blinking when

ON/OFF button on the remote control unit pushed?

YES

Voltage at PIN #30 of Remocon Micom change?

YES

Voltage at collecter of Q601 or Q602 change?

YES

NO

Check as in the procedure “NO Power parts”.

Refer to page 5-2.

YES

Normal

YES

NO

NO

NO

Replace battery.

LCD is faulty.

Replace button.

Micom is faulty.

NO

Q601(C4375Y) or Q602(C1623Y) is faulty.

IR LED(CL-1L5EU) is faulty.

NO

Voltage at pin #26 of micom (IC04) change (INDOOR UNIT)?

YES

Micom (IC04) is faulty.

Receiver module is faulty.


DB98_11868A(1)_1 3/3/03 11:17 AM Page 4-8

Troubleshooting

5-2-9 When the SV-BY is Malfunctioning (Outdoor Unit)

1) Checklist :

(1) Is the SV1 under normal operating condition?

(2) Is the voltage of the power normal? (the rating voltage ±10% range)

(3) Is the connector (CN76) of the SV-BY in good contact?

(4) Is the resistance at both ends of the solenoid about 1.4k

Ω

?

2) Checking procedures

(1) When either of the indoor units (B & C) is turned on

Turn off the outdoor power, and then turn on the power in 5 seconds.

YES

Does the SV-BY operate when either of the indoor units is turned on?

NO

Is the voltage of DC6V applied to both ends of the C901?

YES

(1) Does the No14 pin output of the IC04 maintain "High"?

(2) Does the No1 pin output of the IC04 maintain "Low"?

YES

YES

NO

NO

Normal

• Check and replace the relevant IC (IC02, IC03).

• Check and replace the resistance (R901, R928, R931), and diode (D907, D908).

(1) Is the No12 pin voltage of the IC04 DC7V?


YES

NO

• Check and replace the IC04.


(R902, R903, R905, R906).

Are the Q906, and Q907 in "turn-on" condition?

Is the Q908 in "turn-off" condition?

YES

Is the No8 pin output of the IC04 in "High" condition?

YES

NO


NO

Is the No10 pin voltage of the IC04 DC7V?

YES

NO


• Check and replace the resistance (R922, R924).

Does the operation of the Q702 lead to activation of the SV-BY relay (RY72)?

YES

Replace the SV-BY

NO Check and replace the Q702 and relay.

(Resistance at both ends of the relay: 400

Ω

)


DB98_11868A(1)_1 3/3/03 11:17 AM Page 5-1

Troubleshooting

(2) When all of the indoor units (B & C) are turned off


YES

Is the SV1 turned off after operating for about 2 minutes when all of the indoor units (B & C) are turned off?

NO


(2) Does the No1 pin output of "Low"?

YES

NO

NO

Normal

(1) Is the No.12 pin voltage of the IC04 DC7V?

(2) Is the No.3 pin voltage of the IC04 DC5V?

YES

NO


• Check and replace the IC04 maintain resistance

(R902, R903,R905, R906).

Is the voltage at both ends of the C901 0V?

YES

NO

• Check and replace the

IC02-IC03.

• Check and replace the C901.

Are the Q906 and Q908 in "turn-on" condition?

Is the Q907 in "turn-off" condition?

YES

NO



NO


NO


• Check and replace the R922, and R924.

YES

Is the voltage charged to the C904 above DC7V?

YES

The "High" condition should be maintained for about 2 minutes until the voltage of about DC7V or higher is applied to the C904.

NO

Check and replace the R920 and R921.

Check and replace the C904.

Does the No8 pin output of the IC04 change from "High" to "Low"?

NO

IC04 Check and replace

YES

The output is changed from "High" to "Low" when charging to the C904 is completed.

Does the turning on and then turning off of the Q702 lead to turning off of the SV-BY relay (RY72)?

YES

Replace the SV-BY solenoid.

NO Check and replace the Q702 and relay.

(Resistance at both ends of the relay: 400

Ω

)


DB98_11868A(1)_1 3/3/03 11:17 AM Page 5-2

Troubleshooting

5-2-10 When the SV-B is malfunctioning

1) Checklist :

(1) Is the SV-B under normal operating condition?


(3) Is the SV-B connector (CN75) in good contact?


Ω

?


Turn off the outdoor power, and then turn it on after 5 seconds

YES

Does the SVA operate when the room B among the indoor unit room B and room C is turned on?

YES

NO

NO

Does the photo-coupler (IC02) for the room B among the indoor unit room B and room C operate?

YES

NO

Is the voltage of about DC5V or above applied to both ends of the C905?

YES


YES

! Is the 14th pin output of the IC04 maintained at

"High" level?

@ Is the Ist pin output of the IC04 maintained at

"Low" level?

Normal operation

Check and replace the photo coupler (IC02)

• Check and replace the R929 and R930

• Check and replace the C905

NO

NO

• Check and replace the R901, R928 and D908


NO

! Is the voltage of the 12th pin for the IC04 about DC7V?

@ Is the voltage of the 3rd pin of the IC04 about DC5V?

NO

•Check and replace the IC04

•Check and replace the resistance(R902,

R903,R905,R906)

YES

YES

Are the Q906, Q907, and Q909 under turn on condition, and is the Q908 under "turn off" condition?

YES

NO

Check and replace the relevant transistor

Is the Q703 turned. on, indicating the operating of the SV-B relay (RY73)?

YES

Replace the SV-B solenoid valve

NO Check and replace the D905, D909, and Q703 relay

(Coil resistance at both ends of the relay:about 400

Ω

)


DB98_11868A(1)_1 3/3/03 11:17 AM Page 5-3

Troubleshooting

5-2-11 When the SV-C is malfunctioning

1) Checklist :

(1) Is the SV-C under normal operating condition?


(3) Is the SV-C connector (CN74) in good contact?


Ω

?


Turn off the outdoor power, and then turn it on after 5 seconds

YES

Does the SVB operate when the room C among the indoor unit room B and room C is turned on?

YES

NO

Does the photo-coupier (IC03) for the room C among the indoor unit rooms B and room C operate?

YES

NO

Normal operation

Check and replace the photo coupler(IC03)


YES

NO • Check and replace the R932, and R933



YES

NO • Check and replace the R901, R931, and D907


! Is the output of the 14th pin of the IC04 maintained a "Hight" level?

@ Is the output of the lst pin of the I04 maintained at "Low" level?

NO

! Is the voltage of the 12th pin of the IC04 about DC7V?

@ Is the voltage of the 3rd pin of the IC04 about DC5V?

YES

YES

Are the Q906, Q907 and Q909 turned on with the Q908 being turned off?

YES

NO

NO

• Check the

IC04


(R902, R903,

R905, R906)

Check and replace the relevant transistor

Is the Q704 turned on, indicating the operating condition of the SV-C relay (RY74)?

YES

Replace the SV-C solenoid valve

NO Check and replace the D906, D910, and Q704 relay

(Coil resistance at both ends of the relay : about 400

Ω

)


DB98_11868A(1)_1 3/3/03 11:17 AM Page 5-4

Troubleshooting

5-2-12 When the SV-B and SV-C are malfunctioning with all of the indoor units

(B & C) turned off

(1) Are the SVA and SVB under normal operating condition?


(3) Are the SV-B (CN75) and SV-C (CN74) connectors in good contact?


Ω

?

5-14


YES

Are the SVA and SVB operate turned off after operating for about 2 minutes when all of the indoor units (B & C) are turned off?

YES

NO



YES

NO

Normal



YES

Is the voltage at both ends of the C901 0V?

YES

NO

NO



(R902, R904, R905 R906).

• Check and replace the IC02, and IC03.


Are the Q906 and Q908 in "turn-on" condition?

Are the Q907 and Q909 in "turn-off" condition?

YES


YES

NO

NO

Check and replace each transistor.


YES

NO • Check and replace the IC04.

• Check and replace the R922, and R924.

The "High" condition should be maintained for about 2 minutes until a voltage of above DC7V is charged to the C904.

Do the SVA and SVB operated when the Q703, and Q704 are turned on?

NO • Check and replace the D903, D905, D906 and Q703 Q704.

• Check and replace the SVA and SVB solenoid.

YES

Is the voltage charged to the C904 above DC7V?

YES

NO • Check and replace the R920 and R921.


Is the No8 pin output of the

IC04 changed from "High" to "Low"?

NO

IC04 Check and replace

YES The output is changed from "High" to "Low" when the charging to the C904 is completed.

Are the SV-B and SV-C relays (RY73, 74) turned off when the Q703 and Q704 are turned off.

YES

Replace the SV-B and SV-C solenoids.

NO

• Check and replace the Q703, and Q704.

• Check and replace the relay when necessary.

(Resistance at both ends of the relay: About 400

Ω

)

Samsung Electronics

DB98_11868A(1)_1 3/3/03 11:17 AM Page 5-5

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. When repairing any part on a work bench, be sure to place an insulative sheet on the bench and always keep the sheet surface neat without any metal fragments. If any such fragment touches a part, a secondary trouble will possibly be caused in the part.

3. Before replacing any parts, be sure to turn off the power supply. If such replacement is done with the power supply kept on, an electric shock, short circuit or destruction of a part may result.

4. During replacement or repair of a part, carefully handle it : The printed circuit board has fine lead wires (jumper wires) and glass-made parts (diode) on 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 any part, care should be exercised not to apply any high-wattage soldering iron to the part for a long time.

Some parts are of so low a heat resistance that they may be broken or have the properties changed if a soldering iron is so applied (Otherwise, the pattern may possibly be separated and raised).

7. The heat of the soldering iron should be transfered to the entire object to be soldered. If the solder pieces are not well fused due to insufficient transfer of the heat from the soldering iron, no satisfactory electrical continuity can be assured even if the soldered objects appear well connected to each other.

8. The solder used should be limited to a minimum. If excessive solder is used, it will cause inter-pattern contact, which may cause malfunction of the circuit.

5-3-2 Procedure

The parts should be replaced in the following procedure.

Check for any faulty part.

Detach the faulty part.

Replace it with a new part.

Check the operation of the new part.

The repair is completed.


DB98_11868A(1)_1 3/3/03 11:17 AM Page 5-6

Troubleshooting

5-3-3 Detailed Procedure

No.

1

2

3

Malfunction

Pull out the power plug from the AC terminal and confirm the fuse on the PCB assembly

Checking point (symptoms)

1. Is the broken(open)?

Turn the power on.

Set the TURBO mode

Voltage check

1. AC 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

Voltage over

Causes

Indoor unit fan motor short-circuit

SMPS circuit is faulty


PC02, R202-R205


IC06 is faulty

RY71 is faulty


DB98_11868A(1)_1 3/3/03 11:17 AM Page 5-7

5-4 Fault Diagnosis of Major Parts

Parts

Temp.Sensor

Heat ex. Sensor

Indoor Fan Motor

Diagnosis

Measure resistance with a tester.

Normal 8K

Ω

~27K

Ω at ambient temperature (+0°C ~ +30°C)

Abnormal

∞

, O

Ω

… open or short

Measure resistance between terminals (CN72) with a tester

Normal At ambient temperature (10°C ~ 30°C) between

Red, Yellow

Red, Blue

Resistance

190±10 Ω

170±10

Ω

Outdoor Fan Motor

Abnormal

∞

, O

Ω

… open or short

Measure the voltage between ground and signal wire of the fan motor

Normal between

Gray, Orange

Yellow, Orange

Voltage

0.5V~4.5V

5V

Abnormal

Normal

Abnormal if voltage does not change from 0V to 5V.

At ambient temperature (10°C ~ 30°C) between

Red, Blue

Red, White

Resistance

100±10

Ω

130±10

Ω

Stepping Motor

(UP/DOWN swing motor)

Abnormal

∞

, O

Ω

… open or short

Measure resistance between red wire and each terminal.

Abnormal ∞ , O Ω … open or short


DB98_11868A(1)_1 3/3/03 11:17 AM Page 5-8

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

1 st Remove the battery from the remocon.

2 nd Press the temperature raise/down button simultaneously and insert the battery again.

3 rd Make sure the remocon display shown as .

Step 2 : Second stage preparation of the remocon option set.

❈ Note ; In case the wrong letter has been selected, continue to press the button until the correct letter appears.

1 st

2 nd

3 rd

If the first stage number “ ” appears on the display, proceed to the second stage.

Every time the

!

and

& button, “ ” and “ ” each continue to appear.

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 number is , it is correct otherwise press appear.

@ When pressing the select one of them.

button ~ until appear on the display,

# When pressing the select one of them.

$ When pressing the select one of them.

% When pressing the select one of them.

button button button

~

~

~ appear on the display, appear on the display, appear on the display,

^ When pressing the select one of them.

button ~ appear on the display,


DB98_11868A(1)_1 3/3/03 11:17 AM Page 5-9

Troubleshooting

! If the first number is , it is correct otherwise press appear.

@ When pressing the select one of them.

# When pressing the select one of them.

$ When pressing the select one of them.

% When pressing the select one of them.

^ When pressing the select one of them.

button button button button button

~

~

~

~

~ until appear on the display, appear on the display, appear on the display, appear on the display, appear on the display,

Step 3 : Reconfirming option set after completion

(in case of ex. 020000-170351)

After pressing

After pressing selector for the mode, the display shown as selector for the mode, the display shown as .

.

Step 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 the remote controller.

Second, Re-insert the battery into the remote controller.

Third, Press ON/OFF key with the direction of remote controller for set.

• Error Mode

1 st If all lamps of indoor unit are flickering, Plug out and plug in again and pressing ON/OFF key to retry.

2 nd If the unit is not working properly or all lamps are continuously flickering after setting the option code, see if the correct option code is set up for it’s model.


DB98_11868A(1)_1 3/3/03 11:17 AM Page 5-10

Troubleshooting

<Table of the option code>

MODEL

MC26AC2-07

MC26AC2-12

OPTION CODE

020000-1000D9

020000-100340


DB98_11868A(1)_1 3/3/03 11:17 AM Page 5-11

M E M O


DB98_11868A(1)_2 3/3/03 11:21 AM Page 1-2

6. Exploded Views and Parts List

6-1 Indoor Unit

20-1

20-5

20-3

20-4

20

20-6

20-6-1

20-2

16

19

14

13

15

10

13-1

11

13-2

13-3

13-4

17 18

12

8

22

24

21

9

6

5

7

23

4

3

25

2

1

6-1

You can search for the updated part code number through the ITSELF.

URL : http://itself.sec.samsung.co.kr

Samsung Electronics

DB98_11868A(1)_2 3/3/03 11:21 AM Page 2-1

Exploded Views and Parts List

■ Parts List

No.

CODE NO Description

24

25

DB93-00927A

DB39-00147A

DB94-00056G

DB94-00104A

DB61-00165A

DB39-00146A

DB39-00147A

DB70-00036A

DB94-00058L

DB94-00062E

DB66-00127A

DB66-00128A

DB66-00128B

DB63-00082A

DB95-20138A

DB31-10129A

DB64-00354A

DB63-00064A

DB95-00287G

DB63-00067A

DB92-00248A

DB67-00051A

DB67-00032A

DB63-00083A

DB94-00040F

DB60-20011A

DB31-00033A

DB32-00020A

DB93-01223C

DB93-01018A

DB65-00078A

DB65-10074E

DB93-00859A

DB61-40251A

DB67-60030A

DB96-01123K

DB96-01441A

DB94-40003A

DB93-00251K

20

20-1

20-2

20-3

20-4

20-5

20-6

20-6-1

20-7

21

22

23

16

17

18

19

13-4

13-5

14

15

13

13-1

13-2

13-3

9

10

11

12

7

8

5

6

3

4

1

2

GRILLE-AIR INLET

GUARD-AIR FILTER

ASS´Y-CLEANER FILTER

COVERTER-TEMINAL

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 TRAY DRAIN

ASSY DRAIN-HOSE

BLADE-H

BLADE-V,A

BLADE-V,B

SCREEN-SAFETY WIRE

ASSY-MOTOR STEPPING

MOTOR-STEPPING

ASSY DISPLAY

HOLDER-SENSOR

SPRING-SENSOR

ASSY EVAP-UNIT(EVAPORATOR ASSY)

ASSY CYCLE IN(EVAPORATOR ASSY)

RUBBER BEARING

ASSY REMOCON

Samsung Electronics

MC26AC2-12

1

1

6

1

1

3

1

1

1

1

1

1

1

1

1

1

1

-

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

2

Q’TY

MC26AC2-07

1

1

6

1

1

3

1

1

1

1

1

1

1

1

1

1

1

1

1

1

-

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

2

Remark

6-2

DB98_11868A(1)_2 3/3/03 11:21 AM Page 2-2


6

1

3

10

4

5

7

13(13-1~13-6)

12

18

11

19(19-1~19-7)

14

15

16(16-1)

8

2

9(9-1~9-2)

17(17-1~17-4)


DB98_11868A(1)_2 3/3/03 11:21 AM Page 2-3

Exploded Views and Parts List

■ Parts List

No.

CODE NO Description Specification

13-6 DB35-00015V

14

15

DB62-01416A

DB62-01417A

16 DB96-02103A

16-1 DB95-00403A

17 DB99-00282A

17-1 DB62-01414A

17-2 DB62-01415A

17-3 DB96-02113A

17-4 DB96-02114A

17-4-1 DB95-00403B

17-4-2 DB95-00403C

18 DB32-10018E

19 DB93-01623A

19-1 2301-001379

19-2 2501-001237

19-3 DB26-10063C

19-4 DB61-00585A

19-5 DB61-00584B

19-6 DB65-40072C

19-7 PE-M3000-02

1

2

3

4

5

DB90-01006A

DB90-20207A

DB67-00140A

DB31-00103A

DB90-00967A

6

7

8

DB63-30027C

DB94-50041E

DB90-10574E

9 DB90-40120B

9-1 DB63-10434B

ASSY CABI FRONT

ASSY BASE OUT

FAN PROPELLER

MOTOR FAN

ASSY BKT MOTOR

ASS'Y

ASS'Y

AS+G/F20%,D460

OSM-606SRC

ASS'Y

GUARD COND

ASSY PARTITION

ASSY CABI SIDE

SC-90073T

ASS'Y

ASS'Y

ASSY COVER ASS'Y

COVER PP

9-2 DB63-10433B

10

11

DB90-00569A

DB96-02273A

COVER CONTROL

ASSY CABI UPPER

ASSY COND

12 DB63-30110J SCREEN GUARD

13 G8C124JU1EL ROTARY COMPRESSOR

13-1 DB60-30018A

13-2 DB60-30028A

13-3 DB63-10165D

13-4 DB63-20002A

13-5 DB73-00067A

NUT FLANGE

NUT WASHER

COVER TERMINAL

GASKET

GROMMET ISOLATOR

PP

ASS'Y

ASS'Y

P.E.H 100%

G8C124JU1EL

PI0.8,M5

HEX,2C,M8

PBT,2.5

EPDM,T0.8

NR 40°

OLP

TUBE DISCHARGE A

TUBE DISCHARGE B

ASSY TUBE BY PASS

ASSY SOLENOIDE COIL

ASSY VALVE

TUBE SUCTION A

TUBE SUCTION B

ASSY TUBE CAPI A

ASSY TUBE CAPI B

ASSY SOLENOIDE COIL

ASSY SOLENOIDE COIL

THERMISTOR OUT

ASSY CONTROL OUT

C-OIL

C-OIL

TRANS POWER

CASE PCB

CASE CONTROL OUT

TERMINAL BLOCK

ASSY PCB PARTS

RAC12128-9622

ASS'Y

ASS'Y

ASS'Y

ASS'Y

ASS'Y

ASS'Y

ASS'Y

ASS'Y

ASS'Y

ASS'Y

ASS'Y

103AT

ASS'Y

4uF,450V

35uF,450V

DC17,AC230,400mA

ABS

SGCC-M,T0.8

ASS'Y

ASS'Y

Samsung Electronics

Q’TY

MC26AC2X

Remark

1

1

1

2

1

1

1

1

1

1

1

1

1

1

1

1

2

1

1

1

1

2

6

2

2

6

1

1

1

1

2

1

1

1

1

1

1

1

1

1

1

6-4

DB98_11868A(1)_2 3/3/03 11:21 AM Page 2-4

6-3 ASS’Y Remote Control : DB93-00251K

3

7

4

1

2

■ Parts List

No

5

6

7

3

4

1

2

Description

INLAY LCD

CASE TOP

LCD

KEY RUBBER

ASS'Y PCB REMOCON

CASE LOW

BATTERY COVER

5

Q’TY

1

1

1

1

1

1

1

6

Remark


DB98_11868A(1)_2 3/3/03 11:21 AM Page 2-5

6-4 ASS’Y Control In : DB93-01223C

■ Parts List

No

9

10

7

8

11

5

6

3

4

1

2

Description

HOLDER CONTROL

ASSY MAIN PCB

TERMINAL BLOCK ASSY

ASS'Y DISPLAY PCB

CONNECTOR WIRE PCB U/D

HOLDER CLAMP IN

SEAL CONTROL SIDE

SEAL H/CONTROL FRONT

SCREW MACHINE

CABLE CLAMP

SCREW TAPPING

Samsung Electronics

Specification

DB61-00160A

DB93-01018A

DB65-00078A

DB93-00927A

DB39-00147A

DB61-00219A

DB72-10191T

DB72-00127V

6001-000929

DB65-10074E

6002-000234

Remark

6-6

DB98_11868A(1)_2 3/3/03 11:21 AM Page 2-6

M E M O


DB98_11868A(1)_2 3/3/03 11:21 AM Page 2-7

7. Block Diagrams

7-1 Refrigerating Cycle Block Diagram

INDOOR UNIT OUTDOOR UNIT


DB98_11868A(1)_2 3/3/03 11:21 AM Page 2-8

8. PCB Diagrams

8-1 ASS’Y MAIN PCB : DB93-01018A

■ TOP PATTERN


DB98_11868A(1)_2 3/3/03 11:21 AM Page 2-9

PCB Diagrams

■ Parts List

Description

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.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

45

46

47

42

43

44

48

49

50

51

52

53

54

55

No

28

29

30

31

23

24

25

26

27

20

21

22

16

17

18

19

13

14

15

9

10

11

12

6

7

4

5

8

1

2

3

35

36

37

38

32

33

34

39

40

41

Specification

120x93

KS88C4632

ULN2003AFW

93LC56B-I/SN

TLP181

MMST2907A

2SC2412K

DTA114EKA

DF06S

BZX84-C11

BZX84-C3V6

G3MB202PL

TNY255P

KA78L05

KA7533Z

PC814

UG2B

ST02D-200

INR14D561K-BS

10MHZ

JT1916

HP1-P10 / NFP-1010

5mH/50mA

UKH-12S

CBE2220BA

FB58

250V, 3.15A

250V, 1A

YW396-05AV WHT

YW396-05AV BLU

SMW200-10 WHT

SMW200-5PWHT

SMW300-3P WHT

SMW200-4P WHT

1.2µF, 450V

SD 1000µF, 25

47µF, 50V

470µF, 16V

SD 6.8µF/450V

SDE 2G 222M

CS2012Y5V104Z500NR

CS2012Y5V103Z500NR

CS2012X7R102K500NR

MCR18EZHJ224

MCR18EZHJ104

MCR10EZHF6801

MCR10EZHJ103

MCR10EZHJ682

MCR10EZHJ472

MCR10EZHJ102

MCR10EZHJ561

MCR10EZHJ471

MCR10EZHJ331

MCR10EZHJ221

F3AA012E

Location No.

L101

RY71

BZ61

F701

F701

F702

CN72

CN71

CN91

PC02

D101

CD11

VA71

X301

ST11

FT71

BD71

ZD12

ZD11

SS71

IC01

IC02

IC03

IC04

IC05, IC06

IC51

PC01

Q603

Q201, Q401, Q601, Q602

Q901, Q902

CN61

CN42

CN41

CR71

C104

C601

C107

C101, C109

C103

C102, C105, C106, C108, C201, C202, C301, C402,

C403, C501, C502, C503, C504, C901

C203, C204, C401

C404

R102, R103, R104

R202, R203, R204, R205

R404, R406

R206, R501, R502, R503, R602, R609, R610, R902

R402

R108, R603, R901

R201, R207, R208, R301, R401, R403, R408, R601,

R607, R608

R606

R105, R604, R605

R405, R407

R106, R107

RY72, RY73


DB98_11868A(1)_2 3/3/03 11:22 AM Page 2-10

PCB Diagrams

■ BOTTOM PATTERN


DB98_11868A(1)_2 3/3/03 11:22 AM Page 2-11

8-2 PCB OUTDOOR UNIT : PE-M3000-02


DB98_11868A(1)_2 3/3/03 11:22 AM Page 2-12

PCB Diagrams

■ Parts List

No.

Description

CN77

CN78

PC31~PC33

X501

C105

C103

C101

VA71~75

DS71

FT71

IC01

IC02

F701

F701

TB71

OPJ2

CN70

RY71

IC04

RY72~74, 77, 78

IC01

IC01

-

J01-J09

OP01

C304~306

C501~505, C201, C301~303,

C401, C404, C102, C403

D101~D104

R510~513, 403

R304-306, R403

R301~R303

R201

R401

R402

R701~R704,R701~R706

PCB BOARD

Q301~303

IC03

IC05

CN11

CN41

CN71

CN72

CN73

CN74

JUMP-WIRE

JUMP-WIRE

C-CERAMIC

C-CERAMIC

C-CERAMIC

DIODE-RECT

R-CARBON

R-CARBON

R-CARBON

R-CARBON

R-CARBON

R-CARBON

R-CARBON

PCB-MAIN

TR

RESET IC

IC-DRIVE

CON-HEAD

CON-HEAD

CONNECTOR-WAFE

CONNECTOR-WAFE

CONNECTOR-WAFE

CONNECTOR-WAFE

CONNECTOR-WAFE

CONNECTOR-WAFE

PHOTO-COUPLER

CERAMIC-RESONATOR

C-ELEC

C-ELEC

C-ELEC

VARISTOR

DISCHARGE

NOISE-FILTER

PIN-HOUSING

POWER-RELAY

IC-MCU

RELAY

HEAT-SINK

SCREW-TAPPING

IV-VOLT REGU

IC-VOLT REGU

FUSE

FUSE-HOLDER

TERMINAL TAP

JUMP-WIRE

8-5

Specification

PI 0.6 SN T 52MM

PI 0.6 SN T 52MM

50V 103Z

50V 104Z

50V 104Z

1N4007

RD 1/8 T 10K-J

RD 1/8 T 10K-J

RD 1/8 T 10K-J

RD 1/8 T 1K-J

RD 1/8 T 330-J

RD 1/8 T 6.8K-F

RS 2 T 51K-J

FR-1 197*330

KSR1002

KA7533Z

KID650003AP

SMW250-03 RED

SMW250-02 WHT

YW396-03AV WHT

YW396-03AV BLU

YW396-03AV YEL

YW396-03AV RED

YW396-05AV WHT

YW396-05AV BLU

PC814A

10.0MHZ

25V 470µF

25V 2200µF

35V 1000µF

14D 471

DSA362MA

HP1-P16

YDW236-01

DI1U(12V)

MB89635PSH-XXXX

JQ1A-12V

25MM

PH 3 L6 AB FEFZY

KA7812

KA7805

AC250V 3.15A 20MM

FH51H 7.5A

YTR-250

PI0.6SM T52MM

Q’TY

9

1

3

13

4

11

Remark

1

1

1

1

1

1

1

1

1

3

1

6

1

1

1

1

1

3

1

5

1

1

1

1

1

1

1

-

1

1

1

1

1

1

1

5

Samsung Electronics

DB98_11868A(1)_2 3/3/03 11:22 AM Page 2-13

8-3 ASS’Y DISPLAY PCB : DB93-00927A

7

8

5

6

9

10

3

4

1

2

■ Parts List

No Descrption

PCB-DISPLAY

MODULE REMOCON

TACT SWITCH

C-CERAMIC

C-CERAMIC

DIODE SWITCHING

R-CARBON

JUMP

CONNECTOR WAFER

CONNECTOR WIRE

Location No.

RM01

SW01

C01

C02

D01

R01, R02, R03

J01

CN02

CN01

Specification

64.5x53

KSM-713TH5

KPT-1105A

102K

104Z

IN4148

470 1/2W 5%

10mm

SMAW200-05

UL1007, AWG#26

Q’TY

3

2

1

1

1

1

1

1

1

1

Remark

8-4 ASS’Y CENTER DISPLAY : DB93-00859A


DB98_11868A(1)_2 3/3/03 11:22 AM Page 2-14

M E M O


DB98_11868A(1)_2 3/3/03 11:22 AM Page 2-15

9. Wiring Diagrams

9-1 Indoor Unit


DB98_11868A(1)_2 3/3/03 11:22 AM Page 2-16



DB98_11868A(1)_2 3/3/03 11:22 AM Page 2-17

10. Schematic Diagrams

10-1 Indoor Unit


DB98_11868A(1)_2 3/3/03 11:22 AM Page 2-18

Application date

UPDATE LOG SHEET

Page Part# Note(Cause & Solution) S/Bulletin#

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.

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

Samsung Electronics Co., Ltd.

Printed in Korea.

DB98_11868A(1)_cover 3/3/03 11:16 AM Page 2

ELECTRONICS

© Samsung Electronics Co., Ltd. Mar. 2003.

Printed in Korea.

Code No. DB98-11868A(1)

Samsung MC26AC2X Service manual

ROOM AIR CONDITIONER

INDOOR UNIT

MC26AC2-07

MC26AC2-12

OUTDOOR UNIT

MC26AC2X

SERVICE Manual

AIR CONDITIONER

1. Precautions

CONTENTS

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

1. Precautions

Samsung Electronics

1-1

1-2 Samsung Electronics

2. Product Specifications

2-1 Table

Samsung Electronics 2-1

2-2 Dimensions

2-2-1 Indoor Unit

2-2 Samsung Electronics

2-2-2 Outdoor Unit

Samsung Electronics 2-3

2-3 Pressure Graph

■ MC26AC2-07

■ MC26AC2-12

2-4 Samsung Electronics

3. Operating Instructions and Installation

3-1 Operating Instructions

3-1-1 The Feature of Key in remote controller

Samsung Electronics 3-1

3-1-2 Name & Function of Key in remote controller

3-2 Samsung Electronics

Samsung Electronics 3-3

3-2 Installation

3-2-1 Selecting Area for Installation

3-2-1(a) Indoor Unit

3-2-1(b) Outdoor Unit

3-2-1(c) Remote Control Unit

3-4 Samsung Electronics

3-2-2 Installation diagram of indoor unit and outdoor unit

Samsung Electronics

3-5

3-2-2(a) Fixing the Installation Plate

3-2-2(b) Purging the Unit

3-6 Samsung Electronics

3-2-2(c) Connecting the Assembly Cable.

3-2-2(d) Installing and Connecting the Indoor Unit Drain Hose

Samsung Electronics 3-7

3-2-2(e) Outdoor unit installation

GAS LEAK TEST

WIRING CONNECTION

3-8 Samsung Electronics

Grounding

Samsung Electronics 3-9

3-2-2(f) Air-Purge Procedure

3-10

Samsung Electronics

3-2-2(g) Refrigerant Refill

Vacuum pump

Samsung Electronics 3-11

3-2-2(h) Refrigerant Adjustment

3-2-2(i) Flare nut fixing torque

3-12 Samsung Electronics

3-2-2(j) "Pump down" Procedure

Samsung Electronics 3-13

3-14 Samsung Electronics

4. Disassembly and Reassembly

4-1 Indoor Unit

Samsung Electronics