Samsung AS12A2VC User manual

SERVICE Manual
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
INDOOR UNIT
AS12A2VC
AS09A2VA
AS07A2VA
OUTDOOR UNIT
US12A2VC
US09A2VA
US07A2VA
E DB68-00040A(3)
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1. Installation
1-1 Refrigerant Refill Procedure
Refill an air-conditioner with refrigerant when refrigerant has been leaked at installing or using
1. Purge air(for new installation only).
3. Connect the tank to refill with Refrigerant
4. Set the unit to cool operation mode.
7. Stop operation of the air conditioner.
9. Close the cap of each valve.
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.
5. Check the pressure indicated by the pressure gauge(low
pressure side).
* Standard pressure is should be 64~78kg/cm2in a
reqular, 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.
8. Close the 3-way valve, disconnect the pressure gauge,
and open the 3-way valve again.
R-22
Suspension hook
High
pressure
gauge
Hand
wheel
Finger tight
fittings
Connected to
high pressure
side
Charging
line
For mounting
other and of
hose when
not in use
Compound
gauge
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1-2 “Pump down” Procedure
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 cable.
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 enter-
ing.
5. Disconnect the pipe connected to the out-
door unit.
At this time, cover the valve of the out-
door 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.
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.
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 air conditioner.
7. Close the cap of each valve.
2 Turn the 3-way valve clockwise to close and connect a pres-
sure gauge(low pressure side) to the service valve, and open
the 3-way valve again.
2-Way Valve
3-Way Valve
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2. Disassembly and Reassembly
2-1 Indoor Unit
Stop operation of the air conditioner and remove the power cable before repairing the unit.
No Parts Procedure Remark
1Front Grille 1) Stop the air conditioner operation and block the
main power.
2) Seperate 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 seper-
ate 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.
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.
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No Parts Procedure Remark
Ass’y Tray Drain.
Electrical Parts
(Main PCB)
Heat Exchanger
1) Do “1”, above.
Separate the drain hose from the extension
drain hose.
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”, above
2) Take all the connector of PCB upper side out.
3) Separate the outdoor unit connection wire from
the terminal block.
4) If pulling the Main PCB up. it will be taken out.
(Separate the TRANS hook. it before).
1) Do “1” and “2”, “3”, above
2) Loosen two fixing earth screws of right side.
3) Separate the connection pipe.
4) Separate the bush body at the upper side and
holder at the rearside.
5) Loosen the two fixing screws of left side.
6) Lifting the heat exchanger up a little to push the
up side for separation from the indoor unit.
2
3
4
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No Parts Procedure Remark
Fan Motor and
Cross Fan 1) Do “1” “2” ”3” “4”, above.
2) Loosen the fixing three 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.
5
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2-2 Outdoor Unit
No Parts Procedure Remark
Common Work
Fan and Motor
1) Loosen the fixing screw and separate the cover
E-parts.
2) Separate the connection wire from the terminal
block.
3) Loosen three fixing screws and separate the
upper cabinet.
4) Loosen the two fixing screws of Ass'y E-part.
5) Loosen seven fixing screws and separate the
side cabinet.
1) Do “1”, above.
2) Loosen two fixing screw, of the front cabinet.
3) Push the brackets of the outer cover to sepa-
rate the protection mesh from the rear side of front
cabinet.
1
2
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No Parts Procedure Remark
Heat Exchanger
Compressor
4) Remove the nut flange (Turn to the right to
remove, as it is a left hand screw)
5) Separate the fan.
6) Loosen four fixing screws to separate the motor.
1) Do “1”, above.
2) Loosen three fixing screws of left and right side.
3) Disassemble the inlet and outlet pipe by weld-
ing.
4) Separate the heat exchanger.
1) Do “1”, above.
2) Open the terminal cover of compressor and
unscrew the connection terminal.
3) Disassemble the inlet and outlet pipe of com-
pressor by welding.
4) Disassemble the inlet and outlet pipe of con-
denser by welding
5) Loosen the three bolts of the lower part.
6) separate the compressor.
3
4
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3. Troubleshooting
3-1 Items to be checked first
1) Is the voltage of the power correct?
The input voltage shall be the rating vlotage ±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 5 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 relat-
ed to the malfunction of the airconditioner.
4) Indoor unit observes operation condition of the air conditioner, and displays self diagnosis details
on the display panel.
NO Operation of air conditioner
1 The COOL operation indication LED (Green) 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.
3 Fan speed setting is not allowed in AUTO or DRY mode.
4 Compressor stops operation intermittently in DRY mode.
5 Timer LED only of the indoor unit lights up and the air condi-
tioner does not operate.
6 The compressor stops intermittently in a COOL mode or DRY
mode, and fan speed of the indoor unit decreases.
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 reop-
erated. 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 fan is set to LL 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 and humidity.
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 blinking (1Hz)
2 TIMER LED blinking (1Hz)
3 OPERATING and TIMER LED blinking (1Hz)
4 FAN LEA blinking (1Hz)
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 spead is Below 38Orpm)
Self Diagnosis
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3-2 Fault Diagnosis by Symptom
3-2-1 No Power(completely dead)-Initial diagnosis
1) Checklist :
(1) Is input voltage normal? (the rating voltage ±10% range.)
(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? (11VDC-12.5VDC)
(5) Is output voltage of DC regulator IC KA7805 (IC02) normal? (4.5VDC-5.5VDC)
2) Troubleshooting procedure
Replace PCB
display
Is DC voltage of PCB dis-
play normal?
Remove power cord and plug in again
in approx. 5 seconds
Is operation lamp blinking?
Does operation start when
run/stop button on the remote controller
unit pushed?
Is transmission display of the remote
controller unit blinking?
Is "beep"sound heard from the main
unit?
Is DC voltage of the PCB module
normal?
Are voltages of #62 (compressor), #60(4
way valve) and #61 (outdoor fan) of the
micom normal? 5VDC
Is voltage of #63 (indoor fan) of the
micom normal?
Is voltage at #32 terminal of the Micom normal?
0VDC
Is voltage at #64 terminal of the Micom normal?
5VDC
Is the rating voltage ±10%
range applied to the
primary side of the power
transformer?
•Check linkage between
power cord and
terminal tap
•Check fuse
Is 14~18VAC appear in
the secondary side of the
power transformer?
Replace power
transformer
YES
NO YES
NO
YES
YES
YES
NO
YES
YES
YES
DC5V
10ms
10ms
100ns
NO
NO
OK
YES
YES
YES
YES
NO
NO
YES Normal
Refer to remote control
unit fault diagnosis
Replace PCB
module.
Is output voltage of ICO2 normal?
Check connections
compressor 4-way
valve, outdoor fan and
indoor fan.
Are voltages at RY71(Compressor)
RY73(4-way valve) and SY72(outdoor fan)
normal? DC12V
Is voltage at SS71(indoor fan)
Replace
RY71, RY73,
RY72 and
SS71
NO
NO
NO
Is voltage output terminal of
D101~D105(IN4007) normal?
Replace ICO2
Check PCB pattern.
Replace main PCB.
Replace IN4007
Replace
micom
Is voltage at #25 terminal of the micom
normal?
Are voltage at #30 and #31 of the
micom normal?
NO
NO NO
YES
NO
NO
NO
YES
OK
Is operation normal?
Replace resonator (X501)
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