Samsung AS-1808BR User manual

SERVICEManual
CONTENTSAIR CONDITIONER
1. Installation
2. Disassembly and Reassembly
3. Troubleshooting
4. Exploded Views and Parts List
5. Refrigerating Cycle Block Diagrams
6. Wiring Diagrams
7. Schematic Diagrams
ROOM AIR CONDITIONER
AS-1808BR
AS-2408BR
E DB68-30986A(2)

1
1. Installation
1-1 Refrigerant Refill
• Fill the airconditioner with coolant, or refill when necessary during use.
1 Purge air(for new installation only).
3 Connect the tank to refill with Refrigerant
7 Stop operation of the airconditioner.
9 Close the cap of each valve.
8 Close the 3-way valve, disconnect the
pressure gauge, and open the 3-way
valve again.
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
57~71 psi in a reqular,
high operation mode.
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.
6. Open the coolant tank and fill with coolant
until the rated pressure is reached.
* It is recommended not to pour the
coolant in too quickely, but gradually
while operating a pressure valve.
R-22
Outdoor Unit
Suspension
hook
High
pressure
gauge
Hand
wheel
Finger
tight
fittings
Connected to
high pressure
side
Compound
gauge
2-way valve 3-way valve
For mounting
other end of
hose when
not in use
Charging
line
E DB68-30986A(2)

2
1-2 "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 (B)
and the 3-way valve(A).
3 Set the unit to cool operation mode.
(Check if the compressor is operating.)
5 When the pressure gauge indicates "0"
turn the 3-way valve clockwise to close.
4 Turn the 2-way valve clockwise to close.
6 Stop operation of the airconditioner.
7 Close the cap of each 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.
Relocation of the airconditioner
•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
materal entering.
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.
For mounting
other end of
hose when
not in use
2-Way Valve 3-Way Valve
Compound
gauge
Suspension
hook
High
pressure
gauge
Hand
wheel
Finger
tight
fittings
Connected to
high pressure
side

3
2. Disassembly and Reassembly
2-1 Indoor Unit
Stop operation of the airconditioner and remove the power plug from the wall outlet before
repairing the unit
No Parts Procedure Remark
1 Front Grille 1) Stop the air conditioner operation and
block the main power.
2) Seperate the tape of front.
Panel upper.
3) Contract the second finger to the left and
right handle and pull to open the inlet
grille.
4) Take the left and right filter out.
5) Loosen one of the right fixing screw and
seperate the terminal cover.
6) Open the cover screw and loosen three fix-
ing screws of front grille.
7) Pull the upper left and right of discharge
softly for the outside cover to be pulled
out.
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
No Parts Procedure Remark
2
3
4
Filter Frame
Ass'y Tray Drain
Main PCB
1) Loosen the left and right screw of the
Holder Filter, and Separate the Holder
Filter.
1) Do 1 2 , above.
Separate the holder at the rear side of
Indoor unit.
2) Take the display PCB out.
(Center of indoor unit).
3) Loosen three fixing screws of left and
right.
4) Pull tray drain out from the back body.
1) Do " 1 2 3 ", above
2) Take all the connector of PCB (2 piece)
upper side out.

5
No Parts Procedure Remark
5
6
Heat Exchanger
Fan Motor and
Cross Fan
1) Do " 1 2 3 4 ", above.
2) Loosen the left screws of the heat
exchanger.
1) Do " 1 2 3 4 5 ", above.
2) Loosen the fixing two screws and separate
the motor holder.
3) Loosen the fixing screw of motor fan.
(By use of M3 wrench)
Separate the motor from the fan.
Separate the fan motor the left holder
bearing.
Lifting the heat exchanger up a little to
push the up side for separation from the
indoor unit

6
2-2 Outdoor Unit
No Parts Procedure Remark
1
2
Cabinet
Fan Motor &
Propeller Fan
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.
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.

7
1) The input voltage should be rating Voltage ±10% range.
The air conditioner may not operate properly if the voltage is out of this range.
2) The indoor unit and the outdoor unit shall be linked by 4 cables.
Check the terminals if the indoor unit and outdoor unit are properly linked by the same number of cables.
Otherwise the air conditioner may not operate properly.
3) If a problem occurs as described in the table below, it is a symptom not related to the malfunction of the air
conditioner.
4) Indoor unit observes operation condition of the air conditioner, and displays self diagnosis details
on the display panel.
3. Troubleshooting
3-1 Items to be checked first
NO
1
2
3
4
5
6
Operation of air conditioner
The operation indication LED (Green) blinks when a
power plug of the indoor unit is plugged in for the
first time.
• In a COOL operation mode, the compressor does not
operate at a room temperature than the setting tem-
perature that the compressor should operate.
Fan speed setting is not allowed in AUTO or DRY
mode.
Compressor stops operation intermittently in DRY
mode.
Timer LED only of the indoor unit lights up and the
air conditioner does not operate.
The compressor stops intermittently in a COOL mode
or DRY mode, and fan speed of the indoor unit
decreases.
Itindicatespowerison.TheLEDstopsblinkingif theoperation
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
• The speed of the indoor is changed automatically in DRY mode.
• Fan speed is 4 steps is selected automatically in AUTO mode.
Compressor operation is controlled automatically in DRY mode
depending on the room temperature.
Timer is being activated and the unit is in ready mode.
The unit operates normally if the timer operation is cancelled.
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.
Explanation
NO Display
1 OPERATING LED (GREEN) blinking (1Hz)
2 TIMER LED (YELLOW) blinking (5Hz)
3 OPERATING (GREEN), TIMER LED (YELLOW) blinking (5Hz)
4 FAN (GREEN) LED blinking (5Hz)
Restore from power failure (input initial power)
Temperature sensor defective (open, short)
Indoor heat exchanger sensor defective (open, short)
Indoor fan malfunction (inoperative within 15 sec
- less than 600rpm)
Self Diagnosis

8
3-2 Fault Diagnosis by Symptom
3-2-1 No Power(completely dead)-Initial diagnosis
1) Checklist :
(1) Is input voltage normal?
(2) Is AC power linked correctly?
(3) Are connections between primary side, secondary side of the power transformer
and PCB good.
(4) Is output voltage of DC regulator IC KA7812(IC01) normal? (11.5VDC-12.5VDC)
(5) Is output voltage of DC regulator IC KA7805(IC02) normal? (4.5VDC-5.5VDC)
2) Troubleshooting procedure
Y
N
Y
Y
N
N
N
N
Y
N
Y
Y
Y
N
Remove power cord and plug in again in approx. 5 seconds.
Is operating lamp lights on for
three minutes, and then goes off?
Check whether the fuse is normal? (F701)
Check whether the output voltage of the trans
is normal? (AC 15V±3V)
Check whether the DC 12V is normal?
(DC12±0.5V between "G" and "O" of the IC01)
Check whether the DC 5V is normal?
(DC 5V±0.5V between "G" and "O" of the IC02)
Check whether the display PCB is normal?
(Check the DC 5V, DC12V, wire, etc.)
Replace the assembly main PCB.
Normal
Replace the fuse (250V, 3.15A)
Replace the trans.
Replace the IC01.
Replace the IC02.
Harness check and replace
Replace the assembly display PCB
Is the harness properly connected(CN93, CN94)?

9
3-2-2 When the Indoor Unit Fan Does Not Operate. (Initial Diagnosis)
1) Checklist :
(1) Is input voltage normal?
(2) Is the indoor unit fan properly connected(CN73)?
(3) Is the starting codenser CR 71 properly soldered?
(4) Is HALL IC in indoor fan motor properly connected(CN43)?
(5) When in operation mode, does the indoor unit fan operate?
2) Troubleshooting procedure
Y
N
Y
N
Y
N
Y
Y
N
N
Y
Y
N
Remove power cord and plug in again in approx. 5 seconds.
Is operating lamp lights on for
three minutes, and then goes off?
Check whether the indoor fan turns with the operation
lamp being turned on when the start/stop button of the
remote control is pressed?
•Is a voltage of above AC 240~300V applied to both ends
of theindoor fan connector (CN73)?
•Is pin #3 of the CN43 a square wave?
Replace the indoor fan motor or fan motor capacitor.
Replace the Q401 (KSC945Y).
Replace the IC06.
Replace the SS71 (G3MB202PL).
Go to the item of "No power
parts" (Refer to page 8.)
No problem (Normal)
Is pin #63 of the micom (IC04)
a square wave?
Is pin #13 of the IC06 a square wave?
Is pin #24 of the micom (IC04)
a square wave?
Replace the micom (IC04).