Samsung AWH-1808ER User manual

ROOM AIR CONDITIONER
AWH-1808ER
SERVICE
AIR CONDITIONER CONTENTS
1. Precautions
2. Product Specifications
3. Installation and Operating
Instructions
4. Disassembly and Reassembly
5. Troubleshooting
6. Exploded Views and Parts List
7. Block Diagram
8. PCB Diagram
9. Wiring Diagram
10. Schematic Diagrams
Manual
AWH-1808ER/front 6/13/98 11:00 AM Page 1

ELECTRONICS
Samsung Electronics Co., Ltd. NOV. 1997.
Printed in Korea.
Code No. DB81-10131A
©
AWH-1808ER/front 6/13/98 11:00 AM Page 2

1. Precautions
Samsung Electronics 1-1
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
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 megohms.
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!
Fig. 1-4 Clean the Unit
AWH-1808ER-1 6/13/98 10:12 AM Page 1

2. Product Specifications
2-1 Table
Samsung Electronics 2-1
Item
Type
Dimensions:
(Width X Height X Depth)
Packing Size
(Width X Height X Depth)
Voltage:
Phase
Frequency
Operating Current
Power Consumption
Refrigerant Type
Refrigerant Charge
Cooling Capacity
EER
Net Weight
Condenser
Condenser Fan
Evaporator
Evaporator Fan
Fan Motor
Compressor(Rotary)
Overload Protect
Compressor Capacitor
Fan Motor Capacitor
Fan Speed Control
Thermo Control
OFF Timer
Unit of Measure
-
mm
mm
Volt
-
Hz
A
W
FREON
g
BTU/h
BTU/h.W
kg
Row
Type
Row
Type
W
Model
-
µF/ VAC
µF/ VAC
-
-
hr
AWH-1808ER(Cooling/Heating)
Window
660 X 420 X 695
737 X 476 X 794
220 - 240
Single
50
9.0 / 7.7
2,050 / 1,730
R-22
860
17,000 / 16,500
8.3 / 9.5
59
2 X 16
Propeller Fan
3 X 14
Blower
IC-13435SWJ5A
48B180JV1E7
MRA12016-12007
40 / 450
6 / 450
Fan speed switch (High & Low)
Thermistor
24
Remarks
(DUAL)
AWH-1808ER-1 6/13/98 10:12 AM Page 3

2-2 Dimensions
2-2-1 Main Unit
2-2-2 Remote Control
2-2 Samsung Electronics
660
420 420
695
Front view Side view
Unit : mm
Fan speed adjustment buttons
Temperature adjustment buttons Timer setting buttons
Mode selection buttons
(COOL, HEAT, FAN)
Air flow swing button
ON/OFF Buttons
AWH-1808ER-1 6/13/98 10:12 AM Page 4

3. Installation and Operating Instructions
3-1 Installation
Samsung Electronics 3-1
1. Make sure that you install the unit in an area that
provides good ventilation.
The air conditioner must not be blocked by any
obstacle affecting the air flow near the air inlet and
air outlet.
2. Make sure that you install the unit in an area which
can endure the weight and vibration of the unit.
3. Make sure that you install the unit away from heat
or vapor.
4. Make sure that you install the unit in an area where
the cooled air can be evenly spread in a room.
5. Make sure that you install the unit in an area away
from TVs, audio units, cordless phones, fluorescent
lighting fixtures and other electrical appliances.
(obtain a clearance of at least one meter)
6. Make sure that you install the unit in an area which
provides easy drainage for condensed water.
7. Make sure that you install the unit in an area not
exposed to rain or direct sunlight.
(Install a separate sunblind if exposed to direct sun-
light.)
8. Do not install the unit in an area subjected to noise
or vibration amplification which may affect your
neighbor.
(Fix the unit firmly if mounted in a high place.)
*When selecting the area for installing the unit, be sure to obtain approval of the customer.
Caution:
Do not use the air conditioner in such areas as a greasy area(including machine oil),
saline area(sea side), or sulphuric area(hot spring). When using the air conditioner in these areas,
special maintenance is required. Contact your local dealer or our service center for advice.
AWH-1808ER-1 6/13/98 10:12 AM Page 5

3-2 Function Description
3-2-1 Cooling operation mode
3-2 Samsung Electronics
Air swing button
Remote control sensor
Deice indicator
Temperature/Timer settings
Temperature indicator
Temperature adjusment button
Timer setting button
Timer indicator
Fan speed indicators
Fan speed adjust button
Operating mode indicators
(HEAT, FAN, COOL)
Mode selection button
ON/OFF button Power indicator
The compressor is turned on and off according to the ambient temperature and set temperature.
1. Compressor on and off control
• Compressor on and off control according to the ambient temperature.
*The compressor is turned off when "ambient temperature = set temperature -1˚C"
*The compressor is turned on when "ambient temperature = set temperature +1˚C"
2. Default value after power reset ➔set temperature = 24˚C
FAN SPEED = HIGH
3. Set temperature indicating (setting) range : 1˚C interval from 18˚C to 30˚C.
3-2-2 Heating operation mode
The compressor is turned on and off according to the ambient temperature and set temperature.
1. Compressor on and off control.
• Compressor on and off control according to the ambient temperature.
*The compressor is turned off when "ambient temperature = set temperature +1˚C"
*The compressor is turned on when "ambient temperature = set temperature -1˚C"
2. Default value after power reset ➔set temperature = 24˚C
FAN SPEED = HIGH
3. Set temperature indicating (setting) range : 1˚C interval from 16˚C to 30˚C.
3-2-3 Fan operation mode
1. If "Fan operation mode" signal is received from remocon or panel.
➔ the compressor is immediately turned off and only fan motor is operated at set blowing speed.
➔ it changes such as "HIGH ➔LOW ➔ HIGH"( if Fan speed is selected).
2. The initial FAN speed is set to "HIGH".
3. The set temperature can not be indicated and set.
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3-2-4 LED lamp and LED display indication in case of error detection
Samsung Electronics 3-3
ERROR OPERADTION
ROOM THERMISTOR
(OPEN OR SHORT)
INDOOR PIPE THERMISTOR
(OPEN OR SHORT)
OUTDOOR PIPE THERMISTOR
(OPEN OR SHORT)
7-SEG
LED DISPLAY
E1 displayed
E5 displayed
E6 displayed
LED LAMP DISPLAY
COOL HEAT FAN
Lamp blinking at every second (on for 0.5s and off for 0.5s)
LED lamp off
1. Set operation in case of error occurrence.
• Malfunction of each temperature sensor (open, short)
- Error mode display, warning sound.
- The operation status is off.
2. The "outdoor pipe thermistor" error mode carry out checking only during heating operation and
do nor carry out checking during and "FAN" operation.
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3-4 Samsung Electronics
3-2-5 Panel key operation
Key operational function Key Type
ON/OFF Operation start and stop TACT
*First ON = operation start, second ON = operation stop
*Continuous operation is not available.
Mode Operation mode change (in case of model option heat pump) TACT
*at every ON
- Selected as "COOL –> HEAT –> FAN". (Default=COOL)
*If operation is OFF, it is considered as an invalid key.
*Continuous operation is not available.
Fan speed Indoor fan speed setting.
*At every ON -> selected as "HIGH -> LOW -> HIGH".
*If operation is OFF, it is considered as an invalid key.
*Continuous operation is not available.
Temp. Currently displayed set temperature circulation (in case of option -> ˚C) TACT
*At every pressing, the set temperature is changed by 1˚C (cooling operation)
(24˚C -> 25˚C -> 26˚C -> 27˚C ---> 30˚C -> 18˚C -> 19˚C -> 20˚C ---> 24˚C).
*At every pressing, the set temperature is changed by 1˚C (heating operation)
(24˚C -> 25˚C -> 26˚C -> 27˚C ---> 30˚C -> 16˚C -> 17˚C -> 18˚C ---> 24˚C).
*Single and continuous operation is available.
*In case of the set temperature of 30˚C, when the "increase" key is pressed by
remocon, temperature does not increase any more and waring, sound is
generated.(cooling, heating operation) --> The panel key is circulated continuously.
*If operation is OFF, it is considered as an invalid key.
*In case of fan speed operation, it is considered as an invalid key.
Currently displayed set temperature circulation (in case of option --> ˚F)
*At every pressing, the set temperature is changed by 1˚F (cooling operation)
(75˚F -> 76˚F -> 77˚F ---> 86˚F -> 64˚F -> 65˚F -> 66˚F -> 67˚F ---> 75˚F).
*At every pressing, the set temperature is changed by 1˚F (heating operation)
(75˚F -> 76˚F -> 77˚F ---> 86˚F -> 61˚F -> 62˚F -> 63˚F -> 64˚F---> 75˚F).
*Single and continuous operation is available.
*In case of the set temperature of 86˚F, when the "increase" key is pressed by
remocon, temperature does not increase any more and warning, sound is
generated.(cooling, heating operation) --> The panel key is circulated continuously.
*If operation is OFF or fan speed, it is considered as an invalid key.
Air swing Left and right swing motor operation and stop. TACT
*Once ON = Left and right swing motor operation, Another ON = Left and right
swing motor stop.
*In case of cool blowing inhibition, it is considered as an invalid key.
(only in fan motor OFF range)
*In case of defrosting operation, it is considered as an invalid key.
(only in fan motor OFF range)
*Continuous operation is not available.
*In case of operation stop, when the fan motor is turned off it is considered
as an invalid key.
*In case of deicing operation, the left and right swing motor does not operate.
(it operates when the fan motor is being operated)
Timer Time increase by the convenient reserve (OFF TIMER) time control key. TACT
*At every pressing the time is increased by 1 hour.
(--> 01 -> 02 -> 03 -> 04 -> 05 ---> 18 -> 19 -> 20 -> 21 -> 24 -> --)
*"--" means that the convenient reserve time is not set yet.
(convenient reserve cancelled)
*Single and continuous operation is available.
*If operation is OFF, it is considered as an invalid key.
Key discription
Key name
AWH-1808ER-1 6/13/98 10:12 AM Page 8

3-5
3-2-6 LED lamp operation specifications
Samsung Electronics
LAMP name Operations specifications
ON Operation ON condition : ON
Operation OFF condition : OFF
Blinking just after resetting : Automatic stop after turning on for 0.5 s and off for 0.5s for 3 minutes(if the
operation/stop key is not pressed for 3 minutes).
COOL The mode is set to "COOL" –> ON
Others –> OFF
HEAT The mode is set to "HEAT" -> ON
Others –> OFF
FAN The mode is set to "FAN" –> ON
Others –> OFF
HIGH The fan speed is set to "HIGH" –> ON
Others –> OFF
LOW The fan speed is set to "LOW" –> ON
Others –> OFF
˚C The set temperature is displayed or set -> ON
Others –> OFF
HR During setting of the convenient reserve (OFF TIMER) time -> blinking
After setting of the convenient reserve (OFF TIMER) time -> ON
Others –> OFF
DEICE Till the "deicing" operation is completed during heating opertion -> ON
Others –> OFF
In case of (set) temperature display
-> NO. (1) 7 seg. LED display indicates temperature of the tens digit (˚C, ˚F)
-> NO. (2) 7 seg. LED display indicates temperature of the units digit (˚C, ˚F)
In case of time (OFF TIMER) display
-> NO. (1) 7 seg. LED display indicates time of the tens digit
-> NO. (2) 7 seg. LED display indicates time of the units digit
(1) (2)
AWH-1808ER-1 6/13/98 10:12 AM Page 9

Samsung Electronics
3-2-7 Resistor and voltage values table of room thermistor, indoor thermistor and
outdoor thermistor for each temperature
3-6
Temperature
[˚C]
THERMISTOR
[Kohm]
Voltage
[DC V]
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
1.670
1.729
1.791
1.855
1.922
1.992
2.065
2.141
2.220
2.303
2.390
2.480
2.574
2.672
2.775
2.882
2.994
3.111
3.234
3.362
3.496
3.635
3.780
3.932
4.091
4.257
4.432
4.614
4.806
5.007
5.217
5.438
5.669
5.912
6.167
6.435
6.716
7.012
7.322
7.649
7.993
0.715
0.737
0.759
0.782
0.806
0.830
0.855
0.881
0.908
0.936
0.964
0.993
1.023
1.054
1.086
1.118
1.152
1.186
1.221
1.258
1.295
1.333
1.371
1.411
1.451
1.493
1.535
1.578
1.623
1.668
1.741
1.761
1.809
1.857
1.907
1.957
2.008
2.060
2.113
2.167
2.221
Temperature
[˚C]
THERMISTOR
[Kohm]
Voltage
[DC V]
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
8.354
8.734
9.135
9.556
10.00
10.46
10.94
11.45
11.99
12.55
13.15
13.78
14.44
15.14
15.88
16.66
17.48
18.36
19.28
20.25
21.28
22.38
23.54
24.76
26.06
27.44
28.90
30.45
32.10
33.85
35.66
37.59
39.64
41.82
44.14
46.60
49.22
52.01
54.98
58.14
2.275
2.331
2.387
2.443
2.500
2.556
2.612
2.669
2.726
2.782
2.840
2.897
2.954
3.011
3.068
3.124
3.180
3.237
3.292
3.347
3.401
3.455
3.509
3.561
3.613
3.664
3.714
3.763
3.812
3.859
3.904
3.949
3.992
4.035
4.076
4.116
4.155
4.193
4.230
4.266
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Samsung Electronics 3-7
3-2-8 About the safety devices
1. High temperature release : If temperature of the indoor pipe thermistor increases over the specified value during heating
operation, following operation is carried out for safety of the equipment.
A condition : temperature of indoor pipe thermistor is below 47˚C
B condition : temperature of indoor pipe thermistor is between 58˚C and 63˚C
C condition : temperature of indoor pipe thermistor is over 63˚C
1) High temperature release operation OFF condition = A condition
-> compressor ON (only in THERMO ON condition)
-> fan motor speed = set fan speed and cool blowing inhibiting operation
2) High temperature release operation ON condition = B condition
-> compressor ON
-> fan motor speed = HIGH operation if it was LOW
= HIGH operation if it was HIGH
3) High temperature release operation ON condition = C condition
-> fan motor speed = set fan speed
-> compressor OFF
2. Low temperature release : If temperature of the indoor pipe thermistor decreases below the specified value during cooling
operation, following operation is carried out for safety of the equipment.
A condition : temperature of indoor pipe thermistor is below -1˚C for more than 6 minutes
B condition : temperature of indoor pipe thermistor is over 5˚C
1) Low temperature release ON condition = A condition
-> compressor OFF
-> fan motor "set fan speed"
2) Low temperature release OFF condition = B condition
-> The compressor is turned on if ON condition is satisfied after comparing the ambient temperature with the set
temperature
-> fan motor "set fan speed"
[Detailed description]
1) If temperature of indoor pipe thermistor is below -1˚C for more than 6 minutes, the fan motor continues to operate at
the set fan speed and the compressor is turned off(Low temperature release operation)
2) If temperature of the indoor pipe thermistor increases over +5˚C during low temperature release operation, normal
operation is recovered
: compressor ON, fan mtor set fan speed -> Low temperature release operation OFF
3) If temperature of indoor pipe thermistor increases over 0˚C during counting 6 minutes below -1˚C, the counter is reset.
AWH-1808ER-1 6/13/98 10:12 AM Page 11

3-8 Samsung Electronics
3. Deicing operation : If temperature of the outdoor pipe thermistor decreases below the specified value during heating opera-
tion, following operation is carried out for safety of the equipment.
OUTDOOR PIPE
Thermistor
temperature (A-Condition)
12[˚C]
-4[˚C]
100min
COUNT
ON
100min
COUNT
OFF
100min
COUNT
ON 100min 5min
ON OFF
OUTDOOR PIPE
Thermistor
temperature (B-Condition)
12[˚C]
-6[˚C]
30min
COUNT
ON
30min
COUNT
OFF
30min
COUNT
ON 30min 5min
ON OFF
OUTDOOR PIPE
Thermistor
temperature (C-Condition)
12[˚C]
-8[˚C]
10min
COUNT
ON
10min
COUNT
OFF
10min
COUNT
ON 10min 5min
ON OFF
100min below
30min below
10min below
AWH-1808ER-1 6/13/98 10:12 AM Page 12

Samsung Electronics 3-9
1) Deicing detecting condition
• If one of A, B and C conditions is satisfied, deicing operation is carried out.(AUBUC)
• If counting time is overlapped due to detection reference temperature change during counting of the deicing con-
dition, deicing operation starts when the counting time is finished first.
• The maximum counting time is 100 minutes.
- During deicing operation, the left and right swing motor is turned off and stops at the position before swing.
- If operation is turned off during deicing operation, it is finished and the compressor is turned off.
-> Deice lamp ON, fan motor OFF.
2) Display indication.
• The deice lamp is turned on additionally during deicing cycle.
• Only the deice lamp is turned off when deicing is finished.
3) In case of turning off during deicing operation.
• The compressor is turned off after finishing the deicing operation.
• The deice lamp is turned on during deicing cycle and is turned off when deicing is finished.
4) In case of changing mode to cooling operation during deicing operation.
• Cooling operation is carried out after carrying out deicing operation.
• After the compressor is turned off and 3 minutes is passed, it is restarted.
5) Load operation during deicing operation.
DEICE LED ON
DEICE TIME
CYCLE
COMPRESSOR
FAN
MOTOR
4-WAY
VALVE
ON
ON
1sec
ON
THERMO ON
COOL BLOWING INHIBITION
SET FAN SPEED
AND COOL
BLOWING
INHIBITION
OFF
OFF
OFF
2sec
1min
55sec
DEICE LED OFF
AWH-1808ER-1 6/13/98 10:12 AM Page 13

3-10 Samsung Electronics
4. Cool blowing inhibiting control : In order to inhibit cool blowing during heating operation, the fan motor is operated when
temperature of the indoor pipe thermistor is above the specified value.
• The fan motor speed is controlled according to the temperature of condition of the indoor pipe thermistor.
< Compressor OFF -> Compressor ON >
1) When the indoor pipe thermistor temperature is increasing
indoor pipe thermistor temperature = below 32˚C --> fan motor OFF
indoor pipe thermistor temperature = over 32˚C --> fan motor speed "set blower speed"
2) When the indoor pipe thermistor temperature is decreasing
indoor pipe thermistor temperature = over 30˚C --> fan motor speed "set blower speed"
indoor pipe thermistor temperature = below 30˚C --> fan motor speed "Low"
3) But if the compressor is operating, the fan motor is not turned off but is operated weakly even if the indoor pipe ther-
mistor temperature decreases.
< Compressor ON -> Compressor OFF >
Indoor pipe
thermistor
Indoor pipe
thermistor
32˚C
32˚C
31˚C
30˚C
30˚C
OFF
OFF
LOW FAN
30sec
FAN MOTOR
CONTROL
SET FAN SPEED
LOW FAN
AWH-1808ER-1 6/13/98 10:12 AM Page 14

Samsung Electronics 3-11
< Compressor ON -> Compressor OFF >
indoor pipe thermistor temperature = below 30˚C --> fan motor speed "Low"
indoor pipe thermistor temperature = over 30˚C --> fan motor OFF
30s is passed after compressor is turned off --> fan motor OFF
3-2-9 Compressor delayed operation and 4-way valve delayed operation :
The compressor is turned on after 3 minutes from power resetting or compressor turning off during cooling
or heating operation.
1) The compressor can be turned on after "3 minutes delay" from power resetting or compressor turning off.
2) The 4 way valve is turned off/on after "2 minutes and 55 seconds delay" in the on/off condition.
(during heating operation)
3) The operation is stopped after "2 minutes and 55 seconds delay" in the off condition when the 4 way valve is
turned on.
AWH-1808ER-1 6/13/98 10:12 AM Page 15

4. Disassembly and Reassembly
4-1 Compressor Replacement Flow Chart
Samsung Electronics 4-1
Locate cause of defect
Release refrigerant
Disconnect electrical wiring
from compressor
Cut refrigerant lines
from compressor
Plug disconnected lines
Replace compressor
Inspect electrical
wiring for defects,
and terminals for
correct and secure
connections
Solder discharge line
Corrective action Check refrigerant oil level
Add oil as necessary
Solder suction line Use nitrogen gas
Perform soldering function
Fill system with nitrogen gas
Check for leakage
Recharge system
Recharge system
Evacuate system
Release nitrogen gas?
Problem?
Low oil level? NY
Y N
N
Y
Leakage?
AWH-1808ER-1 6/13/98 10:12 AM Page 17

4-2 Checking the oil
4-2-1 Oil quality
4-2-2 Replacing and refilling the refrigerant oil
1. Replacing the compressor - Do not fill the system with oil as the compressor is already charged.
2. Replacing the condenser - Refill 50cc.
3. Replacing the evaporator - Refill 50cc.
4. Replacing the refrigerant - Refill 30cc.
5. The high pressure side is filled up with oil after the vacuum is completed.
6. When the refrigerant leaks, it is generally not necessary to refill the oil if the leakage is not severe.
4-2 Samsung Electronics
Fill the transparent container with 10cc of oil, and then conduct the test.
Refrigerant Cycle
Normal
Over-heated
Compressor damage
Color
Light Yellow
Brown
Dark brown
Odor
No Odor
-
Pungent oil
Remarks
Return with the system
Oil Change
Oil Change
Oil Condition
AWH-1808ER-1 6/13/98 10:12 AM Page 18

4-3 Disassembly and Reassembly Procedure
Samsung Electronics 4-3
Stop operating the air conditioner, and pull out the power cord before repair.
No. Part name Procedures Remarks
①
➁
➂
Ass'y Grill
Ass'y Cabinet
Ass'y Control
1. Hold the lower part of the grill with two
hands while pressing down on both sides of
the lower part of the cabinet, pull it forward
by about 30˚, and then lift it up for removal.
1. Remove the screws on both sides of the
cabinet to disconnect the cabinet and frame.
2. Pull the handle on the front side of the
bottom, and remove the unit from the
cabinet.
1. Remove four machine screws,
and earth wire screw.
2. Remove three lead wire assemblies and the
deice sensor from the condenser, and
remove two screw on the partition cover.
3. Take out the control box forward.
AWH-1808ER-2 6/13/98 1:15 PM Page 1

Disassembly and Reassembly
4-4 Samsung Electronics
No. Part name Procedures Remarks
➃
➄
➅
Plate-Cover
Ass'y-Evaporator
Plate-Evap Casing
1. Remove 11 screws on the plate cover.
1. Remove two screws on the left
side of the evaporator.
1. Lift up the evaporator, and remove the tray
drain.
2. Remove two screws on the bottom side,
and two screws on the left side of the
plate evap casing.
AWH-1808ER-2 6/13/98 10:27 AM Page 2