Daewoo DSC-1245FL User manual

DAEWOO
WALL MOUNTED SPLIT-TYPE AIR CONDITIONERS
SERVICE MANUAL No.20160824
Models
DSC-1245FL
DSC-1285FL
DSC-1285FLH
CONTENTS
1. IMPORTANT NOTICE
2. PRODUCT DIMENSIONS
3. REFRIGERATION CYCLE DIAGRAM
4. OPERATION DETAILS
5. WIRING DIAGRAM
6. EXPLOSION VIEW AND PART LISTS
7. PRECAUTION
8. NAMES OF PARTS
9. INSTALLATION
10. TROUBLE SHOOTING
11. DISASSEMBLY PROCEDURE

Air Conditioner Service Manual
1. IMPORTANTNOTICE
This service manual is intended for use by individuals possessing adequate
backgrounds of electrical, electronic and mechanical experience. Any
attempt to repair the appliance may result in personal injury and property
damage. The manufacturer or seller cannot be responsible for the
interpretation of this information, nor can it assume any liability in
connection with its use.
The information, specifications and parameters are subject to change due to
technical modification or improvement without any prior notice. The
accurate specifications are presented on the nameplate label.
How to order spare parts
To have your order filled promptly and correctly, please furnish the
followinginformation:
6
Model No. with Indoor or Outdoor
7
Part No. in the Explosion View
8
Part Name
9
The quantity you ordered
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Air Conditioner Service Manual
2. PRODUCT DIMENSIONS
Indoor Unit:
Outdoor Unit:
Model A B C D E F G H I J K
12K
770
240
180
700
552
256
439
302
277.8
48
55
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Air Conditioner Service Manual
10
3. REFRIGERATION CYCLE DIAGRAM
Cooling only
Heat pump
Capillary
Compressor
Accumulator
Heat exchange
(condenser)
Heat exchange
(Evaporator)
2-way valve
Liquid side
3-way valve
Gas side
Cooling
Heating
Gas side
3-way valve
Liquid side
2-way valve
Heat exchange
(Evaporator) Heat exchange
(condenser)
Accumulator Compressor
4-way valve
Capillary Assembly
Check valve
3

Note: Each mode and relevant function will be further specified in following pages.
4.Operation Details
Remote controller
1
2
4
3
5
6
9
7
MODE button
ECO button
FAN SPEED button
TEMP UP button
TIMER button
SLEEP button
TEMP DOWN button
To select the mode of operation.
In cooling mode,press this button ,the temperature
will increase 2 on the base of setting temperature:
In heating mode, press this button, the temperature
will decrease 2 on the base of setting temperature.
To switch the conditioner on and off.
To select the fan speed of auto/low/mid/high.
To set automatic switching-on/off.
Increase the temperature or time by 1 unit.
To activate the function SLEEP .
Decrease the temperature or time by 1 unit.
Air Conditioner Service Manual
Remote Control
The remote controller is not presetting as Cooling Only Air Conditioner or Heat Pump by manufacturer.
Each time after the remote controller replace batteries or is energized, the arrowhead will flashes on the front of
Heat or Cool on LCD of the remote controller.
User can preset the remote controller type depending on the air conditioner type you have purchased as
follows:
Press any button when the arrowhead flashes on the front of Cool , Cooling Only is set.
Press any button when the arrowhead flashes on the front of Heat , Heat Pump is set.
If you don t press any button within 10 seconds, the remote controller is preset as Heat Pump automatically.
Note :
If the air conditioner you purchased is a Cooling Only one, but you preset the remote controller as Heat Pump, it
doesn t bring any matter. But if the air conditioner you purchased is a Heat Pump one, and you preset the
remote controller as Cooling Only, then you CAN NOT preset the Heating operation with the remote controller.
8DISPLAY button
In cooling mode, press this button, the unit will give
the maximum cooling temperature with 16
In heating mode, press this button, the unit will give
the maximum heating temperature with 31 .
9
SWING button
10
To activate or deactivate of the movement of the
DEFLECTORS .
12
HEALTH button
To switch - on /off HEALTHY funtion.
It is a button
which controls the ionizer or plasma generator only
for inverter type.
9
3
4
2
1
8
5
67
5
9
10
11
9
ON/OFF button
11
To LED display (if present)switch on/off the
ECO
12
TURBO button
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Air Conditioner Service Manual
Electronic controller
NOTES:
RT-------Room Temperature.
IPT------Indoor Pipe Temperature.
ST------indoor Setting Temperature.
OPT---Outdoor Pipe Temperature.
CRT---Compensated Room Temperature
1. Automatic mode
1) The initial RT determines A/C working mode and the setting temperature (ST), the mode is
determined effective only once unless A/C shut-down and then re-started. If from other mode
switches to automatic mode (including mode conversion after shutdown), it should be that the
compress stop more than 3 min then temperature judgment and automatic mode are conducted (it
can conduct immediately from fan mode switched to automatic, the indoor fan stops, three minutes
later the response is made and start up). Within 3 min, the output as: Showing the room
temperature, indoor fans starts (or anti-cold airflow), the outdoor fan stops;
With auto re-start controller, once being turned off or in case of an accidently power cut, the A/C is able to
retain and restore the original mode when being turned on or the power supply is resumed, if the auto
restart function activated. power-off after power-on; while if the auto restart function isn’t activated,
the A/C enters standby state.
Heat pump
Mode
Initial RT
Initial ST
Cooling
RT≥26°C
23°C
Dry
26°C
＞
RT≥20°C
7°C
Heating
RT
＜
20°C
23°C
Cooling-only
Mode
Initial RT
Initial ST
Cooling
RT≥26°C
23°C
Dry
26°C
＞
RT≥20°C
7°C
Ventilating
RT
＜
20°C
－
Under automatic mode (including from automatic converted into Dry mode), when A/C received the
temperature UP or DOWN signals from the remote controller, the setting temperature (ST)
adjusts
correspondingly to the current room temperature plus or minus 1°C, the automatic regulating
temperature range is ± 2°C.
2. Cooling mode
1) The control of the compressor
a. When RT－ST≥1°C，the compressor is running.
b. When RT－ST＜－1°C，the compressor stops.
c. When－1°C≤RT－ST＜1°C, the compressor keeps its original state.
2) Outdoor fan motor and the compressor run simultaneously (except for defrosting).
3) The control of indoor fan motor:
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Air Conditioner Service Manual
a. Indoor fan motor can operate by automatic, low, middle, or high airflow speed circularly.
b. Indoor fan motor automatic airflow speed control, it works as shown in Figure 1:
Hi
Mid
Lo
RT－ST 1°C 2°C 4°C
Figure 1 Cooling automatic airflow
When the temperature changing leads the fan speed variation, the switch can only be made orderly,
and in every grade of air flow speed should run 1 minute at least.
3. Dry mode
While select to this mode, the air conditioner operates for 3 minutes according to cooling mode firstly
(ST set at 7°C), and then takes the detected backflow air temperature minus 2°Cas a new set
temperature (the lowest temperature: 5°C) and runs according to cooling mode, indoor fan operates at
low-speed, at this moment the setting operation of fan speed invalid but Swing adjustable.
4. Heating mode
On the Heating mode, the room temperature (RT) is compensated (CRT), after that, the room
temperature displayed on the LED is CRT=RT-3°C.
1) The control of the compressor
a. When ST－CRT≥1°C，the compressor is running.
b. When ST－CRT＜-1°C，the compressor stops.
c. When -1°C≤ST－CRT＜1°C, the compressor keeps its original state
2) Outdoor fan motor and the compressor run simultaneously (except for defrosting)
3) The control of indoor fan motor:
a. Indoor fan motor can operate by automatic, low, middle, or high airflow speed circularly.
b. Indoor fan motor automatic airflow speed control, it works as shown in Figure 2:
Figure 2 Heat automatic airflow
When the temperature changing leads the fan speed variation, the switch can only be made orderly,
and every grade of air flow speed should run 1 minute at least.
4) Vane motor control: run as set state.
5) 4-way valve control:
a. Under heating mode, the four-way valve maintains well-connected status (including the
compressor stops on set condition, except for the defrosting process)
b. When the mode switches into the heating mode or A/C start-up, four-way valves will open 5
Seconds before the compressor starts; while the mode exits from the heating mode or A/C turn off,
Hi
Mid
Lo
ST
－
CRT
1°C
2
°C
4
°C
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Air Conditioner Service Manual
the four-way valve will close 2min later after shut-down the compressor.
6) Defrosting function:
During defrosting, once mode changing, economic operation or temperature setting signals received, the
buzzer and display will make response immediately, but the other operations won’t implement until
defrosting finished;
During defrosting, the signals of On-Off, Timing, Sleep, Fan speed and/or Swing can respond, but the
Fan speed and/or Swing should be in accordance with operation for Cold Air Prevention.
Except the above signal processing during defrosting, no other signals will deal with, only a voice of
buzz for response.
During defrosting, electrical heating (optional function) stops compulsively.
Defrosting Enter and Exit program:
Option 1
：
with jumper JC
The condition of enter defrosting: run into defrosting once any of condition 1, 2, and/or 3 met.
Condition 1：As shown in figure 3
Definition:
The following conditions a, b and c all required to meet:
a. IPT1 settles for IPT1＝IPTmax－△IPT
b. t5≥50min（running time t5≥50min（the compressor runs cumulatively）,t5 is removable，and could
be less than t1）
c. IPT＜40°C，and lasts 2min。
Running into defrosting on condition 1, the first running time of set defrosting is F (8min); after running a
defrosting cycle, the defrosting time should be determined and adjusted.
Figure 3
Condition 2: When running time is more than or equal to 120 min (compressor is running
accumulatively), the indoor temperature is less than 35°C for 2 min sustained. Running into defrosting
under condition 2, defrosting time set is 8 min.
Condition 3: After the compressor is operating for 20min continuously, the indoor pipe temperature is
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Air Conditioner Service Manual
less than 23°C (cold air prevention wind temperature) when the fan stops running (including
temperature dropping when compressor operating, not including the compressor’s starting up course),
and the machine runs into defrosting according to any one condition as below.
Running into defrosting under condition 3, defrosting time set is 10 min.
a) Running into the first defrosting in 20 min after start-up.
b) The interval from last defrosting equivalent to or more than 50 min (stopping the compressor or the
machine in standby is allowed in the meantime).
Option 2: Without Jumper JC, and no OPT outdoor sensor
when the compressor runs for 45 min (accumulated), if the indoor coil temperature is less than 40°C for
2 min, the machine runs into defrosting, and lasts for 3min, otherwise when the compressor
runs for 120 min (accumulated), the machine runs into defrosting automatically and last for 10 min.
Option 3: Without jumper JC, but with OPT outdoor sensor
While heating, when the temperature of condenser is lower than E °C (-4°C), and the compressor runs
for 45 min (accumulated), then the machine runs into defrosting and lasts for 10 min.
Option 4. On heating, while the outdoor fan motor stopped but the compressor operated
accumulative totally 30min, then the machine runs into defrosting and last for 8 min. if the accumulative
totally less than 30min, but accord with one of the condition option 1-3 then the machine runs into
defrosting at the option 1-3 and the accumulative total time restarts from 0.
Conditions for quitting defrosting
(1) The quitting conditions for option 1, option 2 and 4, the machine quits from defrosting if any one
below condition met.
6
a. Defrosting time is over.
7
b. When it runs in defrosting for three minutes, the IPT indoor coil temperature rises 15°C or above
from the bottom point.
(2) The quitting conditions for option 3.
When OPT ≥ 20°C or defrosting for more than 10 min, then quit from defrosting.
(3) Defrosting process shown in Figure 4
Figure 4 Defrosting process
7) Auxiliary electric heating function (optional)
(1) The default condition is automatic on/off the electric heating function.
Compressor Relay
ON
OFF ON
ON
OFF
OFF
ON
ON
ON
OFF
39S 19S 5S
t
4-way Valve
Outdoor Fan
The indoor fan runs in anti-cold wind modle
Defrosting time MAX 12 Min
ON
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Air Conditioner Service Manual
(2) The conditions of auxiliary electric heating works (all the following conditions must be met)
a. the compressor runs for more than 3min；
b. indoor fan runs normally；
c. not in defrosting state;
d. auxiliary electric heating is turned off for more than 30s。
e. ST-RT≥0°C;
f. RT﹤25°C;
g. IPT≤43°C;
(3)The conditions of stopping auxiliary electric heating(any one of the following conditions met, the
state stops)
a. the compressor stops
b. RT≥27°C;
c. IPT≥50°C
d. indoor fan stops。
e. running into sleeping function
5. Fan mode
1) Indoor fan motor is running at setting speed (the speed same as heating mode).
2) Vane motor control: running according to the setting condition.
3) The outdoor unit doesn’t work under fan mode.
6. Sleeping mode
1) Under sleep mode, the indoor fan motor running at low speed, except the power light and sleep light
are ON, timer lights ON/OFF according to the setting state, running light OFF. LED will be OFF after
displaying 30S.
2) Temperature control:
6
(1) While changing from Cool mode to Sleep mode, one hour later, the operation Temp.=ST＋1°C，
another one hour later, the operation Temp.=ST＋2°C，after then the temperature has no changed
anymore.
7
(2) When changing from Heating mode to Sleep mode, one hour later, the operation Temp.= ST-1°C，
another one hour later, the operation Temp.=ST-2°C，after then no changed anymore.
3) The machine will automatically shut up after running 10 hours under sleep mode.
When Timer ON and Sleep mode are implemented at the same time, the Sleep mode can not be
functioned.
7. Timer function
The timer can preset between 10min to 24h, when the time set less than “10” hours, the displayed time
shown by 0.5 hour as the unit, when the time set more than or equal to “10” hours, the displayed time
shown by 1 hour as the unit.
8. Emergency switch (ON/OFF)
1) When stand-by, to operate by pressing the emergency switch as follows:
Press the emergency switch within 3 seconds, release emergency switch while the buzzer rings once,
the machine goes into Cooling mode. If the buzzer rings twice while release emergency switch,
Heating mode is selected. To press the Emergency switch while A/C is on, the buzzer rings once and
then A/C will shut down.
2) The machine runs mandatorily as selected mode within 30min when Emergency operated,
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Air Conditioner Service Manual
meanwhile indoor fan motor runs in high-speed, and stepping vane swinging as well. 30min later the
A/C goes into automatic mode under the same operation manner, the set temperature to be 23°C, and
the rotate speed of indoor fan motor automatic control, stepping vane swinging all the way.
3) To press the emergency button when the A/C goes on operation, then the machine runs into
stand-by.
4) Under emergency operation, the function of compressor’s time-delay protection, Anti-frosting
protection in cooling mode, Overheating protection in heating mode, sensor fault protection and defrost
operate are effective.
5) Under emergency operation, once effective signal from remote controller received, the A/C
exits form of emergency mode without delay, and operates according to the setting value from remote
controller immediately.
9. Auto-restart function
1) The PCB retains the setting parameters in case of power off. When the power supply is resumed,
the machine, which has been started up the power-off memory function, is able to restore into the
original running state automatically.
To press the emergency button and power on the unit, and hold on for10 seconds, The buzzer
2) will ring three times, after this operation, the auto restart function activated.
3) To close auto restart function while it is activated, repeat process as above 2), the buzzer will ring
four times.
10. Protection / Failure code
10.1 Protection
1) Compressor’s protection:
a. The PCB which with Auto-restart function, once it is activated, the compressor goes along 3min
delay protection when power on, otherwise the compressor without this protection even when the PCB
is power-on.
b. The compressor’s 3 min interval protection: the compressor can’t start-up until it stops 3 min later.
(except for the defrosting process).
c. ．Afterthe compressorstarted,it’soperationstateremains the samewithin3minevenwhenST,RTvariation.
2) Anti-frosting protection of indoor evaporator (Cooling mode):
If IPT≤0°Cdetected in consecutive 3 min, compressor and outdoor fan motor to be stopped operation,
indoor fan motor runs at high-speed forcibly; if IPT≥5°Cdetected 3min later, then outdoor fan motor
and compressor will start up, and indoor fan motor restores to it’s original state.
3) Overheating protection (Heating mode):
If IPT≥55°C, the outdoor fan motor: OFF.
If IPT≥65°C, the compressor: OFF, and indoor fan motor runs at
high-speed forcibly.
When IPT≤48°C, the outdoor fan motor and the compressor start up, indoor fan motor restores to it’s
original state.
4) Cold air prevention (Heating mode):
This function is intend to prevent cold air from being discharged when the heating operation starts or when
defrosting.
a. When running into the heating mode, once the compressor fails to comply with the start-up
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Air Conditioner Service Manual
conditions, the fan speed is regulated according to the coil temperature within 2 min, 2 min later the
indoor fan motor stops. If the compressor starts up within 2 min, then operating according to Figure 5.
Under heating process, while the compressor stop (including stopping for protection), the fan motor’s
operation (including stopping the indoor fan motor) is regulated according to the coil temperature within
1min, 1min later the fan will be stopped forcibly.
b. When the indoor fan motor running at a low-speed under cold air prevention operation, once
auxiliary electric heating works, the vane immediately withdraws from the cold air prevention location
and turn back to normal vane angle. While auxiliary electric heating stops, indoor fan motor goes on to
run at low-speed accordingly, the vane turns to cold air prevention location
Figure 5 Cold air prevention
10.2 Failure code
The following table shows the fault protections.
When failures happens, the PCB alarms and buzzer rings three times, Failure code shows on
display board, and the PCB operates protection procedures.
Failure code: For the machine with LED display (88), the code shows on LED, for machine without
LED, the code reflects by the running light.
Failure
Running Light Flash
LED Display (88)
RT Sensor Failure
Once / cycle
E1
IPT Sensor Failure
Twice / cycle
E2
Indoor Fan Motor Failure
6 times / cycle
E6
While failure happens, the code displayed statically, if there are several failure codes reported at the
same time, then failure codes appears by turns every eight seconds correspondingly.
6
a. Sensor’s failure protection: when the sensor tested temperature out of the range ---
50°C≤T≤110°C, sensor failure is determined.
Once RT and/or IPT sensor failure appears, the compressor stops, and indoor and outdoor fan motors
shut off. Remote controller doesn’t response to any signal except for
shutdown. During failure the
machine can run in fan mode. After the failure is settled, the PCB restores to standby status.
7
b. Failure protection of Indoor PG fan motor: If there is no feedback signal of rotated speed within 5s,
Set fan speed
Temperature dropping
Temperature rising
Stop the fan motor
Stop the fan motor
25°C
34°C
27°
23°C
Set fan speed
32°
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Air Conditioner Service Manual
the indoor fan motor stops, meanwhile, the compressor, outdoor fan motor, four-way valve and/or
auxiliary electric heater etc. also cut down.
The indoor fan motor restarts again 10 seconds later, if still there is no feedback signal of rotated speed
within 5 seconds, the A/C stops and goes into indoor fan motor failure protection, buzzer rings three
times, and running light flashes at6 times per 8 seconds. Once there is feedback signal while the failure
recovery, the failure will relieve automatically.
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Air Conditioner Service Manual
5. WIRING DIAGRAM
MODEL: DSC-1245FL DSC-1285FL
INDOOR UNIT:
¦È
OUTDOOR UNIT
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Air Conditioner Service Manual
MODEL: DSC-1285FLH
INDOOR UNIT:
OUTDOOR UNIT
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Air Conditioner Service Manual
6. EXPLOSION VIEW AND PARTS
EXPLOSION VIEW
Mode: DSC-1245FL DSC-1285FL DSC-1285FLH
INDOOR UNIT:
22
27
23
25
19
18
17
16
15
14
13 12 11 10 98
7
6
543
2
1
24
20
26
21
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Air Conditioner Service Manual
MODEL: DSC-1245FL DSC-1285FL
OUTDOOR UNIT:
10 11 12 13
9
86
75
17
14 15 16 18 19
24
23
22
21
20
432
25
1
26
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Air Conditioner Service Manual
MODEL: DSC-1285FLH
OUTDOOR UNIT:
11 12 13
9
10
8
765
18
14 15
17
16
20
19
21
22
24
23
25
432
26
1
27
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Air Conditioner Service Manual
PARTS LIST
Indoor unit:
Model: DSA-1285FL DSA-1885FL DSA-2485FL
No. Part No. Part Name Q’ty Remark
1
Installation Plate
1
2
Base
1
3
Vertical Vane Assembly
2
4
Cross Fan
1
5
Bearing Mount
1
6
Evaporator
1
7
Face Frame
1
8
Screw Cover
2
9
Air Filter
2
10
Display PCB Box
1
11
Display PCB
1
12
Front Panel
1
13
Vane
1
14
Power Supply Cord
1
15
Cable Clamp
1
16
Main PCB
1
17
Electrical Box
1
18
Transformer
1
19
Indoor Sensor Assembly
1
20
Sensor Holder
1
21
Indoor Motor
1
22
Indoor Motor Cover
1
23
Drainage Hose
1
24
Vane Motor
1
25
In And Out Pipe Fixer
1
26
Remote Controller
1
Not shown in Explosion view
27
Remote Controller Supporter
1
28
Indoor Carton
1
29
Left Foam
1
30
Right Foam
1
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Air Conditioner Service Manual
Outdoor unit:
Model: DSC-1245FL DSC-1285FL
No.
Part No.
Part Name
Q’ty
Remark
1
Grille
1
Optional
2
Top Cover
1
3
Condenser
1
4
Outdoor Motor Supporter
1
5
Outdoor Motor
1
6
Propeller Fan
1
7
Left Grille Supporter
1
8
Front Plate
1
9
Fan Guard
1
10
Capillary Assembly
1
11
Compressor And It Accessories
1
12
Discharge Pipe
1
13
Suction Pipe
1
14
Base
1
15
Two-way Valve
1
16
Valve Supporter
1
17
Three-way Valve
1
18
Right Plate
1
19
Electrical Box Cover
1
20
Capacitor Strip
1
21
Cable Clamp(
φ
8)
1
22
Terminal
1
23
Compressor Capacitor
1
24
Fan Motor Capacitor
1
25
Electrical Parts Box
1
26
Partition plate
1
27
Base Carton
1
Not shown in the Explosion view.
28
Cabinet Carton
1
29
Base Foaming
1
30
Cover Forming
1
19