Samsung AM26A1C13 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
AM26A1C13
AM18A1C09
OUTDOOR UNIT
UM26A1C2
UM18A1C2
E DB68-31040A(5)
1-31040A(5)-CO 4/17/01 3:58 PM Page 1

1
1. Installation
1-1 Refrigerant Refill Procedure
If connecting pipe of more than 10 metres is installed, additional refrigerant should be charged by extra
metre. You don’t have to charge additional refrigerant up to 10 metres of connecting pipe.
1. Remove the valve stem cap and service port of 3-way
valve.
3. Operate the unit at the cooling mode.
4. Slowly open the valve of the low pressure side of
Manifold gauge counterclockwise until the low pressure
of manifold gauge indicates 4.8 to 5.5 kg/cm2(68 a
78psi) at the high cool operation (1-unit operation) and
the standard temperature.
It is recommend that refrigerant should be slowly put in.
If the refrigerant is put in too quickly, compressor will be
damaged.
5. Stop operation of the air conditioner.
6. Disconnect the charge hose of manifold gauge.
7. Close the cap of each valve.
2. Connect the charging hose of low pressure side of
Manifold gauge to the packed valve having a charging
port(1/2Ó Packed valve) as shown at the right figure.
• Piping length and the height
Additional refrigerant charge
(R22,g)
• When length of the pipe is
over 5u by the unit, you
should charge
the refrigerant Formulas
A-UNIT : 10gx(La-10)/m
B-UNIT : 10gx(Lb-10)/m
(La:the length of A-unit’s
pipe Lb:the length of
B-unit’s pipe)
A-UNIT 1/4Ó 1/2Ó 15m(49ft 3in) 3m(9ft 10in)
B-UNIT 1/4Ó 1/2Ó 15m(49ft 3in) 3m(9ft 10in)
A-UNIT 1/4Ó 3/8Ó 15m(49ft 3in) 3m(9ft 10in)
B-UNIT 1/4Ó 3/8Ó 15m(49ft 3in) 3m(9ft 10in)
Max.piping
length
A
Max
height
B
LIQUID GAS
Pipe Size
AM26A1C13
AM18A1C09
INDOOR
A-UNIT
INDOOR
B-UNIT
INDOOR UNIT
OUTDOOR UNIT
A
B
1- 4/17/01 4:41 PM Page 1

2
1-2 ÒPump downÓ Procedure
Relocation of the air conditioner
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.
5. Disconnect the pipe connected to the out-
door 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
location.
8. Remove the mounting plate for the indoor
unit and move it to a new location.
2-Way Valve
Cap
3-Way Valve
• Refer to this procedure when the unit is relocated.
1. Confirm that both the 2-way and 3-way valves are set to
the open position.
(1) Remove the valve stem caps.
(2) Be sure to use a hexagonal wrench to operate the Gas
side valve stems.
2. Operate the unit for 10 to 15 minutes.
3. Stop operation and wait for 3 minutes, then connect the
charge set to the service port of the 3-way valve.
(1) Connect the charge hose with the push pin to the ser-
vice port.
4. Air purging of the charge hose.
(1) Open the low-pressure valve on the charge set slightly
to air purge from the charge hose.
5. Set the liquid side 2-way valve to the closed position.
6. Operate the air conditioner at the cooling cycle and stop
operation immediately after setting the 3-way valve to the
closed position when the gauge indicates 0 kg/cm2G.
If the unit can not be operated at the Cooling Mode(weath-
er is rather cool), operate the unit at the Trubo Mode. So
that the unit can be operated.
7. Disconnect the charge set, and mount the both 3-way
valve’s stem nuts and the service port cap.
1- 4/17/01 4:41 PM Page 2

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
1Front 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 seper-
ate the terminal cover.
6) Open the cover screw and 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.
1- 4/17/01 4:41 PM Page 3

4
No Parts Procedure Remark
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 , 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 " ", 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).
2
1 2
1 2
3
4
1- 4/17/01 4:41 PM Page 4

5
No Parts Procedure Remark
Heat Exchanger
Fan Motor and
Cross Fan
1) Do " ", above.
2) Loosen the left screws of the heat exchanger.
1) Do " ", 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.
51 2 3 4
1 2 3 4 5
6
Lifting the heat exchanger up a little to
push the up side for separation from the
indoor unit
1- 4/17/01 4:41 PM Page 5

6
2-2 Outdoor Unit
No Parts Procedure Remark
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 above.
2) Remove the nut flange.
(Turn to the right to remove as it is a left turned
screw)
3) Disassemble the propeller fan.
1
1
2
<AM18A1C2>
<AM26A1C2>
<AM26A1C2>
<AM18A1C2>
1- 4/17/01 4:41 PM Page 6

7
3. Troubleshooting
3-1 Items to be checked first
1) Is the voltage of the power correct?
The input voltage shall 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 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 conditioner 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 5 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 LED 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 speed is Below 38Orpm)
Self Diagnosis
1- 4/17/01 4:41 PM Page 7

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) Is output voltage of DC regulator IC KA7812(IC01) normal? (11.5VDC-12.5VDC)
(4) 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), #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 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, outdoor
fan and indoor fan.
Are voltages at RY71(Compressor)
RY72(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
YESNO
NO
NO
YES
OK
Is operation normal?
Replace resonator (X501)
1- 4/17/01 4:41 PM Page 8

9
3-2-2 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)(CN43)?
(2) Is the AC voltage correct?
(3) Is HALL IC in indoor fan motor properly connected with the connector (CN43)?
(4) Is the running capacitor properly connected with the terminal?
2) Troubleshooting procedure
After unplugging out the power cord should
be reconnected within five seconds.
Does the operating lamp(Green) 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 AC 180V
Normal
voltage
YES
YES
YES
NO
NO
NO
Check as in the procedur ÒNO power partsÓ Refer tp
page 8.
Microcomputer is out of order.
PCB is
out of order. PCB should be
replaced.
Replace MFC
Fan motor
should be replaced.
Fan motor
is out of order.
MF-C is out of order
YES
-
Test rod location
+
SS71- SS71- 12V
Normal
Voltage
1- 4/17/01 4:41 PM Page 9