Warnings And Safety Precautions - LG LTN16385PL Service Manual

SAFETY AND SERVICE PRECAUTIONS
SAFETY PRECAUTIONS
Please read before start your service refrigerator:
1. Disconnect your refrigerator before start the service in
order to prevent electric discharge
2. Check visually there's no a gas leakage or short circuit in
the refrigerator
3. In case of realize tests with the connected refrigerator,
use rubber gloves to prevent any accident
4. If you use any appliance, verify voltage and capacity
regularly
5. Don't touch metallic parts with humid hands, they could
be adhered
6. Make sure there's no water drain to electric or metallic
parts
7. When the freezer door is open and you're checking the
low part, be careful when you lift. You head could be hited.
8. Remove all the glasses, metal u other freely parts when
you tilt the refrigerator.
9.When servicing the evaporator, wear gloves
to prevent injuries from the sharp evaporator
fins.
SERVICE CAUTIONS
Refrigerant Charge to Compressor
Test compressor operation before recharge the refrigerant,
this is important in order to detect immediately failures and
assure compressor motor reliability.
If the failure has been localized, clean possible R-134a
remnants' in the system breaking the end of the compressor
service tube in the thinnest part. As shown in Fig. #1
Change the filter and any other damaged part. Disjoint and
pull away the rest of the service tube. Put a new tube
extension in the Hansen male connector. Weld the new
tube. (See Fig. #2)
Breaking point
Service Tube Extension
Fig. # 1
Extension tube
(load)
Con.
Hen.
Hansen
male
connector
Welding point
Fig. # 2
- 3 -
It's necessary to realize the welding process with the
opened valve to allow the freely output of gasses from oil.
Use a female connector to join the new tube extension and
the Hansen connector with the vacuum pump. (See Fig. #3)
Vacuum
pump
Fig. # 3
The vacuum process to the system starts as soon as the
pump starts to work. The refrigerator system must be
maintained under vacuum until the low pressure meter
indicate Absolute 0 or -1 atm, -760 mmhg (See Fig. #3) In any
case, the pump must not be working for more than 30
minutes.
In case of leakage and the vacuum couldn't be realized, it's
necessary to apply a small amount of Freon to the system. If
the vacuum isn't achieved (the lower pressure meter doesn't
indicate Absolute 0 or -1 atm, -760 mmhg) turn on the
refrigerator and try to localize the leakage with a leakage
locator. If you identify a welding failure, open the valve to
normalize the interior pressure with the same exterior
pressure before welding. The molten solder could be
suctioned o expelled and block the cycle tubes if the vacuum
system isn't stabilized.
As soon as the vacuum process finish, charge the correct
refrigerant R-134a gram amount in the system. Remember,
each system use an exact R-134a amount with a tolerance of
±5 grams. (See Fig. #4)
Fig. # 4
Pressure
gauge
Cylinder of R-134a
Refrigeration
System