Samsung AS18A0RCF User manual

SERVICE Manual
SPLIT TYPE AIR CONDITIONER
AS18A9(0)RCF
AS18A9(0)RCFD
AS24A1(2)RC
AS24A1(2)RCD
Indoor Unit
US18A9(0)RCF
US18A9(0)RCFD
US24A1(2)RC
US24A1(2)RCD
Outdoor Unit
EDB98-15775A(4)
AS18A9(0)RCF SM_E_15775 3/10/05 7:16 PM Page 43

2
The following safety precautions must be taken when using your air conditioner.
WARNING
Risk of electric shock. • Can cause injury or death. • Disconnect all remote electric
power supplies before servicing, installing or cleaning. • This must be done by the
manufacturer or its service agent or a similar qualified person in order to avoid a
hazard.
Safety Precautions
◆The unit should not be installed by the user. Ask the dealer or authorized
company to install the units except room air conditioners for the U.S.A and
Canada area.
◆If the unit is installed improperly, water leakage, electric shock or fire may
result.
◆The air conditioner must be installed in accordance with national wiring
regulations and safety regulations wherever applicable.
◆Mount with the lowest moving parts at least 8.2ft(2.5m) above the floor or
grade level. (If applicable)
◆The manufacturer does not assume responsibility for accidents or injury
caused by an incorrectly installed air conditioner. If you are unsure about
installation, contact an installation specialist.
◆When installing the built-in type air conditioner, keep all electrical cables
such as the power cable and the connection cord in pipe, ducts, cable
channels e.t.c to protect them against liquids, outside impacts and so on.
I
NSTALLING THE UNIT
◆If the power cord of this air conditioner is damaged, it must be replaced by
the manufacturer, its service agent or similarly qualified persons in order to
avoid a hazard.
◆The unit must be plugged into an independent circuit if applicable or
connect the power cable to the auxiliary circuit breaker. An all pole
disconnection from the power supply must be incorporated in the fixed
wiring with a contact opening of >3mm.
◆Do not use an extension cord with this product.
◆If the unit is equipped with a power supply cord and a plug, the plug must
be accessible after installation.
◆This appliance must be installed accordance with the national wiring
regulations.
POWER SUPPLY LINE,
FUSE OR CIRCUIT
BREAKER
AS18A9(0)RCF SM_E_15775 3/10/05 7:15 PM Page 2

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AIR CONDITIONER
SPLIT TYPE
Contents
DISASSEMBLE AND REASSEMBLE
1. Indoor unit
2. Outdoor unit
4
8
TROUBLESHOOTING
1. Items to be checked first
2. Abnormal diagnosis by symptom
3. Replace PCB module
15
16
21
ASSEMBLY DRAWING AND PART’S LIST
1. Indoor unit
2. Outdoor unit
3. PCB Box
22
24
28
WIRING DIAGRAM
1. Indoor unit
2. Outdoor unit
38
39
36
SCHEMATIC DIAGRAM
1. Indoor unit 40
REFRIGERATING CYCLE BLOCK DIAGRAM 29
SET UP THE OPTION CODE 12
ΙΙ
ΙΙΙΙ
ΙΙΙΙΙΙ
ΙΙΛΛ
ΛΛ
ΛΛΙΙΙΙΙΙ
ΙΙΧΧ
PERFORMANCE CURVE 30
ΛΛ ΙΙ
PCB DIAGRAM
1. Main PCB
ΛΛ ΙΙΙΙ
AS18A9(0)RCF SM_E_15775 3/10/05 7:15 PM Page 3

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Disassemble and reassemble
1 Indoor unit
Stop operation of the air conditioner and remove the power cable before repairing the unit.
No. Part Procedure Remark
Front Panel
11) Stop the operation of the air conditioner
and block the main power.
2) Separate the tape from the front panel.
3) Contract the second finger to the left,
and right handle. And pull the inlet grille
to open.
4) Take the left and right filter out.
5) Loosen one of the right screw and
separate the terminal cover.
6) Loosen three screws of front grille.
*Taking off the deodorizing and
Electrostatic filter out. (Option)
ΙΙ
If y u disassemble the heat exchanger, y u must pump d wn at first.
AS18A9(0)RCF SM_E_15775 3/10/05 7:15 PM Page 4

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No. Part Procedure Remark
Assembly Tray
Drain
21) Separate the drain hose from the
extension drain hose.
2) Take the display PCB out.
(Center of the indoor unit)
3) Pull tray drain out from the back body.
7) Pull the upper left and right of discharge
softly so that the outside cover is
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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Disassemble and reassemble (Continued)
ΙΙ
No. Part Procedure Remark
Electrical
Parts
(Main PCB)
Heat
Exchanger
3
4
1) Take out all the connector of PCB
on the upper part.
2) Separate the outdoor unit connection wire
from the terminal block.
3) If you pull out the main PCB up, it will be
taken out.
1) Loosen two ground screws at the right
side.
2) Separate the connection pipe.
3) Separate the bush body at the upper
side and holder at the rear side.
4) Loosen the two screws at the left side.
5) Lift the heat exchanger up a little to push
the upper side to separate it from the
indoor unit.
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No. Part Procedure Remark
Fan Motor and
Cross Fan
51) Loosen two screws and separate the
motor holder.
2) Loosen the screw of fan motor.
(By use of M3 wrench)
3) Separate the fan motor from the fan.
4) Separate the fan from the left holder
bearing.
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Disassemble and reassemble (Continued)
ΙΙ
2 Outdoor unit
No. Part Procedure Remark
Common Work
11) Loosen the fixing screws and separate
the cover control.
2) Separate the connection wire from the
terminal block.
3) Loosen the fixing screws and separate
the upper cabinet.
4) Loosen the fixing screws and separate
the front cabinet.
5) Loosen two screws and pull up the
control box.
6) Loosen the nut on the terminal cover
and open it.
7) Separate the comp lead wire.
■ US18A9(0)RCF/US18A9(0)RCFD
❊ The designs and shape are subject to change according to the model.
AS18A9(0)RCF SM_E_15775 3/10/05 7:15 PM Page 8

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No. Part Procedure Remark
Fan and Motor
2
3
8) Loosen the fixing screws and separate
the cabinet side.
[US18A9(0)RCF]
Loosen the fixing screws and separate
the cabinet side LF and RH.
[US18A9(0)RCFD]
1) Remove the nut flange
(Turn to the clockwise).
2) Separate the fan.
3) Loosen four screws to separate
the motor.
1) Release the refrigerant at first.
2) Disassemble the inlet and outlet
pipe by welding.
3) Loosen the fixing screws of the heat
exchanger.
4) Separate the heat exchanger.
5) Loosen three bolts of the compressor.
6) Separate the compressor.
Heat Exchanger
and compressor
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No. Part Procedure Remark
Common Work
11) Loosen the fixing screws and separate
the cover control.
2) Separate the connection wire from the
terminal block.
3) Loosen the fixing screws and separate
the upper cabinet.
4) Loosen the fixing screws and separate
the front cabinet.
5) Loosen three screws and pull up the
control box.
6) Separate the terminal cover and
separate the comp lead wire.
■ US24A1(2)RC/US24A1(2)RCD
Disassemble and reassemble (Continued)
ΙΙ
❊ The designs and shape are subject to change according to the model.
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No. Part Procedure Remark
Fan and Motor
Heat Exchanger
and compressor
2
3
7) Loosen the fixing screws and separate
the cabinet side.
[US24A1(2)RC]
Loosen the fixing screws and separate
the cabinet side LF and RH.
[US24A1(2)RCD]
1) Loosen the fixing bolt and separate
the fan.
2) Loosen four fixing bolts to separate
the motor.
1) Release the refrigerant at first.
2) Disassemble the inlet and outlet pipe
by welding.
3) Loosen the fixing screws of the heat
exchanger.
4) Separate the heat exchanger.
5) Loosen four bolts of the compressor.
6) Separate the compressor.
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Set up the option code
ΙΙΙΙ
The method for setting up the model option with the remote control
◆ It is necessary to set up option codes after replacing the main PCB with service parts.
Make sure that you can set up option codes of the remote control after replacing the main PBA.
Otherwise, the unit won’t be working properly and all LED lamps on display will be flickering.
1. Remove the battery from the remote control.
2. Press the temperature button simultaneously and insert the battery again.
3. Make sure the remote control display shown as .
Step 1 Preparing for the remote control to the main PCB option set.
Step 2 Preparing for the remote control option set.
NN
NNoo oott ttee ee
1) If the first number is , it is correct. Otherwise, press the button
until appears.
2) When pressing the button ~ on the display, select one of them.
3) When pressing the button ~ on the display, select one of them.
4) When pressing the button ~ on the display, select one of them.
5) When pressing the button ~ on the display, select one of them.
6) When pressing the button ~ on the display, select one of them.
In case that the wr ng letter has been selected; c ntinue t press the butt n until the
c rrect letter appears.
1. If the number “ ”appears on the display, proceed to the second stage.
2. Every time you press the 1) and 7) button, “ ” and “ ” continue to appear.
3. Every time you press the 2), 3), 4), 5), 6), 8), 9), 10), 11), 12) button, the number increases
from ~ ( , , , , , , , , , ) and , , , , , in order.
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Press the button for the “ ” mode and the display will be shown as .
Press the button for the “ ” mode and the display will be shown as .
Step 3 Reconfirming the option set after completing
Example : 000000-1700b7
7) If the first number is , it is correct. Otherwise, press the button
until appears.
8) When pressing the button ~ on the display, select one of them.
9) When pressing the button ~ on the display, select one of them.
10) When pressing the button ~ on the display, select one of them.
11) When pressing the button ~ on the display, select one of them.
12) When pressing the button ~ on the display, select one of them.
NN
NNoo oott ttee ee
1 Remove the battery from the remote control.
2. Insert the battery into the remote control.
3. Press the (On/Off) button in the direction of the remote control for set.
Step 5 Testing the unit
When pressing the (On/Off) button in the direction of the remote control for unit,
it sounds beep or ringing and the first LED(STANDARD) lamp on the left side is
flickering at the same time, then the input option is completed. If it doesn’t sound
ringing, try again by pressing the (On/Off) button.
Step 4 Pressing the (On/Off)button
Err r m de
1. If all lamps of the indoor units are flickering, plug out and in again and press the
(On/Off) button again.
2. If the unit doesn’t work properly or all lamps are continuously flickering after setting the option
code, check that the option code is set properly for its own model.
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Set up the option code (Continued)
ΙΙΙΙ
A table of the option code
Model
AS18A9RCF/AS18A9RCFD
AS18A0RCF/AS18A0RCFD
AS24A1RC/AS24A1RCD
AS24A2RC/AS24A2RCD
09000-1A0201
08000-1A0201
09000-1A0340
08000-1A0340
Option code
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Troubleshooting
ΙΙΙΙΙΙ
1 Items to be checked first
1) The input voltage should be voltage rating within ±10% range.
The air conditioner may not operate properly if the voltage is out of this range.
2) Is the connection cable linking the indoor unit and the outdoor unit properly?
The indoor unit and the outdoor unit shall be linked by six 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) When a problem occurs due to the contents illustrated in the table below, it is not a symptom related
to the malfunction of the air conditioner.
4) Indoor unit observes operation condition of the air conditioner and displays self diagnosis on the
display panel.
No.
Operation of air conditioner
The STD operation indicator, LED blinks when a
power plug of the indoor unit is plugged in at first.
1It indicates power is on. The LED stops blinking if the
operation On/Off button on the remote control is pushed.
In the Cool mode, the compressor does not operate
at a room temperature higher than the setting
temperature while the indoor fan operates.
2
3
4
5
It happens after three minutes when the compressor is
reoperated. The same phenomenon occurs when a power
is on. As a phenomenon that the compressor is
reoperated after three minutes, the indoor fan is adjusted
automatically with reference to a temperature of the air.
The Fan speed operating is not allowed in the Auto
or Dry mode.
The speed of the indoor fan is set to LL in the Dry mode.
The Fan speed is five steps are selected automatically in
the Auto mode.
Compressor stops operating intermittently in the Dry
mode.
The compressor is controlled automatically in the Dry
mode depending on the room temperature and humidity.
The compressor stops intermittently in the Cool or
Dry mode, and the 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 from
freezing depending on the inside/outside air temperature.
Explanation
NO. Display
STD LED blinking (1Hz)
TIMER LED blinking (1Hz)
STD and TIMER LED blinking (1Hz)
BIO LED blinking (1Hz)
STD, BIO and TIMER LED blinking(1Hz)
All LED blinking(1Hz)
1
2
3
4
5
6
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 450rpm)
EEPROM Error
Option Error (Option error wasn’t setup or option data error)
Self Diagnosis
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Troubleshooting (Continued)
ΙΙΙΙΙΙ
2 Abnormal diagnosis by symptom
1. No Power - Initial diagnosis
1. No Power - Initial diagnosis
1) Checklist :
(1) Is input voltage normal? (voltage rating within ±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 input voltage of DC regulator IC KA7805 (IC02) 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
display normal?
Remove the power cord and plug it in
again in approx. five seconds
Does the lamp blink?
Does it start operating when
you push the On/Off button
on the remote control?
Is transmission display of the
remote control unit blinking?
Does the ‘beep’ sound from the
main unit?
Is DC voltage of the PCB module
normal?
Are voltages of #8 (IC04 : compressor),
#6(IC04 INdoor fan) of Micom normal? :
5VDC is voltage of #60 (IC04 : indoor fan)
of Micom normal?
Is voltage of #33 terminal of Micom (IC04)normal?
0VDC
Is voltage of #18 terminal of Micom (IC04)normal?
5VDC
Is voltage rating within ±10%
range applied to the between
#1 and #3 of CN78
Check linkage between
a power cord and
a terminal tap
Check fuse
Does 11~12.5VDC appear
in the input side of the DC
regulator ic ka7805(ic02)?
Replace
PCB module
Refer to page 21
YES
YES
NO YES
NO
YES
YES
YES
NO
YES
YES
YES
DC5V
10ms
10ms
250ns
NO
NO
OK
YES
YES
YES
YES
NO
NO
YES
Normal
Refer to remote control
unit abnormal diagnosis
Replace the PCB module
Refer to page 21
Is output voltage of ICO2 normal?
Check connections
of compressor
outdoor fan
and indoor fan
Are voltages of RY71(Compressor)
and RY72(outdoor fan) normal?
DC12V Is voltage of SS71(indoor fan)?
Replace RY71,
RY72 and
SS71
NO
NO
NO
Is voltage output terminal of
D101~D105(IN4007) normal?
Replace ICO2
Replace PCB module
Refer to page 21
Replace IN4007
Replace
Micom
Is voltage of #52 terminal of
Micom (IC04) normal?
Are voltages of #48 and #49 of
Micom (IC04)normal?
NO
NO
NO
YESNO
NO
NO
YES
OK
Is operation normal?
Replace resonator (X501)
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2. When the Indoor Unit Fan Does Not Operate - Initial Diagnosis
2. When the Indoor Unit Fan Does Not Operate - Initial Diagnosis
1) Checklist :
(1) Is the indoor unit fan motor properly connected with the connector (CN73)?
(2) Is the AC voltage correct?
(3) Is HALL IC in the indoor fan motor properly connected with the connector (CN43)?
(4) Is the running capacitor properly connected with PCB board?
2) Troubleshooting procedure
After unplugging out, the power cord should
be reconnected within five seconds.
Does the STD lamp(Orange) blink?
Does the Solid State Relay(SS71) work
properly?
Is the supply voltage of the fan
motor sufficient?
Test rod location
PCB CN73 Condition
Fan operate about AC
180V
Normal
voltage
pin #3 and #5
YES
YES
YES
NO
NO
NO
Check as the procedure “No power”
Refer to page”16”
Micom is abnormal
PCB is
abnormal
Replace the PCB
module
Refer to page21
Replace MFC
Replace Fan motor
Fan motor
is abnormal.
MFC is abnormal
YES
-
Test rod location
+
SS71- SS71- 12V
Normal
Voltage
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18
Troubleshooting (Continued)
ΙΙΙΙΙΙ
3. When the Outdoor Unit Does Not Operate - Initial Diagnosis
3. When the Outdoor Unit Does Not Operate - Initial Diagnosis
1) Checklist :
(1) Is input voltage normal? (voltage rating within ±10% range)
(2) Is the set temperature of the remote control higher than room temperature in the Cool mode?
(3) Is the POWER IN connector (CN78) linked correctly?
(4) Is the outdoor unit properly connected with the terminal black connector(Refer to page 5)?
2) Troubleshooting procedure
After unplugging out, the power cord
should be reconnected within five seconds.
Does the STD lamp blink?
YES
YES
NO
NO
YES
NO
NO
NO
YES Outdoor unit is
abnormal.
Power relay
is abnormal.
Replace the
Power relay
Replace the PCB module
Refer to page 21
PCB is abnormal.
Check PCB
Room temperature sensor is
abnormal.
Check PCB
and room
temperature
sensor
Check as the procedure "No Power"
Refer to page 16
Is the room sensor registered normal?
50°F(10°C) 68°F(20°C) 86°F(30°C)
17.96k Ω12.09k Ω8.3k Ω
Does the timer lamp blink during operation ?
Is the power relay RY71 operated by adjusting
the room temperature?
Is voltage rating within ±10% range applied relay
between CN 78 1 and 3 ?
21
1
3
12
3
YES
Test rod location
+
IC06 Pin #6
-
GND
Condition
RY71 ON
Normal
Voltage
DC 4.8V
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4. When the UP/DOWN Louver Motor Does Not Operate - Initial Diagnosis
4. When the UP/DOWN Louver Motor Does Not Operate - Initial Diagnosis
1) Checklist :
(1) Is input voltage normal? (voltage rating within ±10% range)
(2) Is the UP/DOWN louver motor properly connected with the connector (CN61)?
2) Troubleshooting procedure
Remove the power cord and plug it in again in approx. five seconds
Does the STD lamp blink?
Does it start operating when you push the swing
button of the remote control?
Is voltage of #1 ~ #4 of Micom (ICO4)
changed?(Squarewave)
Is voltage of pin#10, #11 IC05 (KID65003),
#15 and #16 changed? (squarewave)
The UP/DOWN louver motor is abnormal.
Driver IC06 (KID65003) is abnormal.
Micom (IC04) is abnormal.
Normal
Check as the procedure
"No Power". Refer to page 16
NO
NO
NO
YES
YES
YES
NO
YES
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Troubleshooting (Continued)
ΙΙΙΙΙΙ
5. When the remote control does not operate - lnitial Diagnosis
5. When the remote control does not operate - lnitial Diagnosis
1) Troubleshooting procedure
Remove the power cord and plug it in again approx. five Seconds
Does the STD lamp blink? Check as the procedure “No Power”
Refer to page16
Normal
Replace the battery
LCD is abnormal.
Replace button
Micom is abnormal.
Receiver module is abnormal.
Q601(C4375Y) or Q602(C1623Y) is
abnormal. IR LED(CL-1L5EU) is
abnormal.
The melody sounds from the indoor unit when you
push the On/Off button on the remote control.
Is voltage of battery less than 2.5V (Remote Control Unit)?
Is LCD display status of the remote control normal?
Is voltage of #30 of remote control of Micom (IC04) changed?
Is voltage at collector of Q601 or Q602 changed?
Is voltage of #26 of Micom (IC04) changed (Indoor unit)?
Micom (IC04) is abnormal.
Does the transmission display lamp blink when you
push the On/Off button on the remote control?
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
AS18A9(0)RCF SM_E_15775 3/10/05 7:15 PM Page 20