Daewoo Frs U20 Service Manual

70
Remarks
●Refrigerant is erupting rapidly from the compressor to circulate pipes, so pipe shaking noise
can make to some degree.
●In case compressor vibration is sent to a pipe directly, apply vibration absorber rubbers to welding
points of the pipe and comp. or to a much bent point on the pipe.
Start
Separate the touching
pipes, if any. NY
Apply cushion material between
Comp. base and Tray drip. YN
Move or change the points of
vibration absorber rubbers on
the pipes to reduce the shaking. YN
Attach a...

71
Door switch is soaked with
water or there is water in
the switch ?
PCB input is OK ?
Start
Change the door switch.
NY
Repair any disconnection
of wires and defective
Door switch. Y
Connector insertion to
Main PCB is OK ?N
Repair the defective
connection.
Y
Door switch itself is 
OK ?N
Change the switch.
NY
Check it up.
Door switch is pushed 
well ?
Y
Attach a thin pad on the
door liner or change the
door assembly.
Check if interior light is ON.
N
9-5. Door 
9-5-1. Door Opening Alarm Continues though...

72
10-1. Summary of Heavy Repair
* Installation should be conducted in accordance with
the standard installation procedure. (Leave space of
more than 5 cm from the wall for compressor
compartment cooling fan mounted model.) Transportation
and
installation* Copper brush, Rag, Tool box * Remove flux from the silver weld joints with soft 
brusher wet rag. (Flux may be the cause of corrosion
and leaks.)
*Clean tools and store them in a clean tool box
or in their place. Compressor
compartment
and tools...

73
1) Nitrogen only should be used when cleaning inside of cycle pipes
inside and sealing.
2) Check leakage with an electronic leakage tester.
3) Be sure to use a pipe cutter when cutting pipes.
4) Be careful not the water let intrude into the inside of the cycle. Others.1) Weld under nitrogen atmosphere in order to prevent oxidation
inside a pipe. (Nitrogen pressure : 0.1~0.2 kg/cm2.) Nitrogen blowing
welding.1) Be sure to replace drier when repairing pipes
and injecting refrigerant. Replacement of...

74
1) Remove residual refrigerant more than 5 minutes later after
turning off the refrigerator. ( If not, compressor oil may leak inside.)
2) Remove retained refrigerant slowly by cutting first high pressure
side (drier part) with a nipper and then cut low pressure side. 1. Removal of residual
refrigerant.Precautions Items
10-3. Practical Work for Heavy Repair
* When replacing a drier:
Weld ①and②parts by blowing nitrogen (0.1~0.2kg/cm2) to high
pressure side after assembling a drier.
* When replacing a...

75
* Pipe Connection
Connect a red hose to the high pressure side and a blue hose
to the low pressure side.
* Vacuum Sequence
Open ①,②valves and evacuate for 40 minutes.
Close valve ①. 3.Vacuum degassing.Precautions Items
* Charging sequence
1) Check the amount of refrigerant supplied to each model after
completing vacuum degassing.
2) Evacuate bombe with a vacuum pump.
3) Measure the amount of refrigerant charged.
- Measure the weight of an evacuated bombe with an electronic scale.
- Charge refrigerant...

76
Precautions Items
4) Refrigerant Charging
Charge refrigerant while operating a compressor as shown above.
5) Pinch a charging pipe with a pinch-off plier after completion of charging.
6) Braze the end of a pinched charging pipe with copper brazer and take
a gas leakage test on the welded parts. 4.Refrigerant charging.
BombeCompressorEvaporator
CondenserDryer Hot Pipe
* Take a leakage test on the welded or suspicious area with an
electronic leakage tester. 5. Gas-leakage test
* Check each pipe is...

77
10-5. Brazing Reference Drawings.
▶Welding Point
●
■Copper Welding (Ag 5%)7 Points
3 Points Silver Welding (Ag 35%)
Hot Pipe
F
REvaporator
CondenserI-Pipe
Accumulator
Suction Pipe
Dryer
Capi-Tube
Pipe Suc Conn
Pipe Conn B
Compressor
▶Flow of Refrigeration Cycle
Compressor
Pipe Conn. BWire-Con. Pipe
Hot PipeDryer
Capillary Tube
EvaporatorAccumulator
Pipe Suction Conn
Suction Pipe
HighLow
 

78
11-1. Installation Preparation
11. INSTALLATION GUIDE
Check if the refrigerator can pass
a doorway or enter a door first. 
Dimensions( including Door Handles)
(Width*Depth*Height)     
903mm X 734.5mm X 1790mm
Find a suitable place to install
Sufficient space from refrigerator back to the
※wall for free air ventilation※Avoid direct sunlight.
Once the installation place is ready follow the installation instructions.
If surround temperature of refrigerator is low (below 10℃)), 
foods can be frozen or...

79
11-2. If the refrigerator can not enter the door
Removing Freezer Door 
1
※Remove front bottom cover first, if it is attached.
Remove front bottom cover first,
Pull out the left collar of the 
coupling first, then hold the 
coupling and pull out the left 
water tube.2Unscrew top hinge cover with a
screw driver.
Remove the hinge cover.3Turn top hinge bolt
counterclockwise . 
Disconnect the harness wires.
4Lift up the front of hinge to remove. 
( After the hinge is removed the
door can fall down...