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LG LRTBC1825T Service Servicing Precautions

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SERVICING PRECAUTIONS
AIR RECHARGING
IN COMPRESSOR
Test the refrigeration
system connecting
it electrically before
refilling operation. It is necessary to ascertain the function
of the motor-compressor
and identify the defects
immediately.
If defects have been found, empty the old
system of possible R-134a residue by breaking off the end
of the extension piece at its narrow point. (Figure 1)
Replace the filter and any damaged components.
Unsolder
and pull off the piece remaining inside the service tube and
then attach an complete extension with male Hansen and
at last, solder it to the same tube again. (Figure 2)
POINT TO BE BROKEN
CHARGE
TUBE
FEMALE
EXTENSION
HANSEN
i
MALE NANSEN
SERVICE
TUBE EXTENSION
SOLDERING
POINT
Figure
1
Figure
2
It is necessary
to execute the soldering operation with
valve open so that the fumes caused by oil residue can
come out freely without blowholes between
two tubes
during the heating the of the point to be soldered.
The extension
fitted with the male Hansen is connected
to
the female fitting of the vacuum pump tube. (Figure 3)
GAUGE
Figure
3
Air evacuating from the system begins as soon as the
pump starts. The refdgerafion system must be kept under
vacuum until the reading on the fow-pressure
gauge
indicates vacuum (0 absolute, -1 atm., -760 mm hg). In any
case it is advisable to keep the pump running for about 30
minutes. (Figure 3)
If considerable
leakage occurs, it will be necessary to stop
the vacuum
pump and to add a small quantity of Freon to
the system, ff vacuum should not be obtained (pressure
gauge can't fall to 1 atmosphere),
start the refrigeration
unit and find the leakage with special leak-finder.
When the
defective soldering point is visible, repair it after opening
the extension tube valve and reestablishing
the normal
outside pressure inside the group.
Because the melted alloy is sucked into the tubes and
blocks them, the pressure must be rebalancad
when
vacuum is in the system when soldering. As soon as the
vacuum operation is over, add the quantity in grams of
R-134a to the refrigeration
system. Remember
that every
system has an exact quantity of R-134a that can be added
with a tolerance of ±5 grams. (Figure 4)
TO THE R-134a CYLINDER
TOsYsTEMTHE
REFRIGE TION
f
Figure
4
Before performing this operation (if the vacuum pump and
refilling cylinder are connected), make sure that the valve
placed between the vacuum pump and the refilling tube is
closed in order to keep the Fraon for addition to the system.
(Figure 5)
FILUNG OR
VALVE TO BE OPENED
CHARGE TUBE
WHEN REFILLING
TO THE REFRIGERATION
TO THE CHARGE
SYSTEM
CYLINDER
VALVE TO BE CLOSED
AFTER VACUUM
TO THE
VACUUM
I
Figure
5
PUMP
In addition, check the graduated
scale on the cylinder for
the quantity of R-134a to be added, for example, if we
have 750 grams of Freon in the cylinder and must add 140
grams to the group, this amount will be reached when
R-134a has dropped to 610 grams, remembering that the
indicator shows a lower limit of meniscus.
Do this after
choosing the scale corresponding to the gas pressure
different scales reported as the same gas pressure
indicated by the pressure gauge on the top of the column.
To make R-134a flow into the system, open the valve
placed at the base of the cylinder connected
to the filling
tube. The amount of Freon cannot be added to the system
all at once because it may cause a blocking of motor-
compressor.
Therefore,
proceed by adding the original
quantity of about 20-30 grams and close the valve
immediately.
The pressure rises and the motor compressor
must start
sucking the gas and lowering the pressure again. Open the
valve again, maintaining
the same manner until reaching to
the quantity of R-134a established
for the system being
charged. When the system is running, the suction pressure
must be stabilized
between 0.30 to 0.6 (0.10 to 0.4)
atmosphere.
-3-

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  Summary of Contents for LG LRTBC1825T Service

  • Page 1 SERVICING PRECAUTIONS AIR RECHARGING IN COMPRESSOR vacuum operation is over, add the quantity in grams of R-134a to the refrigeration system. Remember that every Test the refrigeration system connecting it electrically before system has an exact quantity of R-134a that can be added refilling operation.
  • Page 2 2000.12. 160/120 CIRCUITDIAGRAM/SCHeMA DE MONTAGE WA_R _A_PL¥1NG'riMECON_OL OP'iION 1_._,¢co_,, ,,,,,.,=,,, _. CAUllON: Ptme mplooth_po*_ coed AVB_ISSEMB_'T: Ve_llezd6branchar Is cordm_'drnenle_ de b primrnum_. TIME Temp_ 10.5 S_ 9sec 10 se_ 11se_ . Jt _| 12se( 13se_ 14se( 15se_ =--3 r"3 6WITCH0N pART C,kPi, CIIOR pARTp,T.D STi_Ti_R PINiliIi QI_ Plde _e Cm_m_ _...
  • Page 3: Parts Identification

    2. PARTS IDENTIFICATION FREEZER COMPARTMENT Freezer Shelf (Steel or Plastic) Lamp (Optional) Freezer Door Bin General Type ice Tray (Optional) Door Cooling On the refrigerator door, Freezer Temperature the cold air passageway is Control Dial installedto supply cold air to the doorside of the refrigerator Temperature compartment.
  • Page 4 3. DISASSEMBLY 3-1 DOOR 3-2 DOOR SWITCH • Freezer Door 1. To remove the door switch, pull out it with a slotted type 1. Remove the hinge cover by pulling it upwards. driver as shown in (figure 9). 2. Disconnect the lead wire from the switch. 2.
  • Page 5 3-4 FAN AND FAN MOTOR 3-6 LAMP 1. Remove the freezer shelf. (If your refrigerator have an REFRIGERATOR ROOM LAMP Ice Maker, disassemble the Ice maker first) 2. Remove the gdlle by pulling it out and by loosening a screw. 3.
  • Page 6 4. ADJUSTMENT 4-1COMPRESSOR 4-2-3 PTC-Apptied Circuit Diagram • According to Starting Method for the Motor 4-1-1 Role The compressor intakes low temperature and low pressure gas evaporated from evaporator of the refrigerator, and OVERLOAD PROTECTOR(O.L.P) condenses this gas to high temperature and high pressure gas.
  • Page 7: Circuit Diagram

    4-30LP (OVERLOAD PROTECTOR) CONTACTING 4-3-1 Definition of OLP POINT COVER (1) OLP (OVERLOAD PROTECTOR) is attached to the Compressor and protects the Motor by cutting the current to the Motor if the temperature rises and activates the bimetal spring in the OLP. (2) When over-voltage flows to Compressor motor, the...
  • Page 8: Troubleshooting

    6. TROUBLESHOOTING 6-1 COMPRESSOR AND ELECTRIC COMPONENTS Remove the PTC- Power Source. Starter from the (Rating Voltage Compressor measure the voltage between Terminal C of Compressor Terminals 5 or 6 of PTC. 1"{ No Voltage. OLP disconnected? Replace OLP. Check connection condition, Reconnect.
  • Page 9: Defrost Timer

    6-2 PTC AND OLP Normal operation of Separate the PTC- ,.._I Observation value is Compressor Starter from eCh cte%ikcacno( tmhl_nents. I 220V/50Hz : 22D-t 30 % impossible or poor. Compressor 115V/60Hz : 6.8;Zt30% measure the 240V/50Hz : 33_Z_30% resistance between 127, 220VI60Hz : 22_._ No.
  • Page 10: Other Electric Components

    6-4 OTHER ELECTRIC COMPONENTS • Cooling is impossible doesn't run. the following Cause components. a. Thermostat _ Poor contacting gas leakage. b. Starting devices _, Shorted or broken. Poor contacting c. OLP _' or shorted. _-Coilshorted. d. Compressor coil e. Defrost 33mer _ Poor contacting Replace indicated component.
  • Page 11: Service Diagnosis Chart

    6-4 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY Cooling • Is the power cord unplugged from the outlet? - Plug to the ouUet, impossible. * Check if the power S/W is set to OFF. • Set the switch to ON. •...
  • Page 12 6-5 REFRIGERATING CYCLE • Troubleshooting Chart CAUSE STATE OF STATE OF THE TEMPERATURE THE SET EVAPORATOR OF THE REMARKS COMPRESSOR PARTIAL Freezer Low flowing sound of A little higher • Refrigerant level is low due LEAKAGE compartment Refrigerant is heard and than ambient to a leak.
  • Page 13 • General Control of Refrigerating Cycle ffEMS STANDARDS PURPOSES REMARKS UNIT Min, Pipe and Pipe: within I hour. To protect The opening time should be reduced moisture piping system Comp: within 10 minutes, to a half of the standards dudng rain Drier;...
  • Page 14: Exploded View And Replacement Parts List

    7. EXPLODED VIEW & REPLACEMENT PARTS LIST • The parts of refrigerator and the shape of each part are subject to change in different localities. • Capacitors and fuse are optional parts. GR-T622, GR-T722 • k: Optional parts -16-...
  • Page 15 -17-...
  • Page 16 -18-...