LG LRTPC2031NI, LRTPC1831NI Owner’s Manual

SERVICING PRECAUTIONS
AIR RECHARGING IN COMPRESSOR Test the refrigeration system connecting itelectrically 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)
POINT TO BE BROKEN
SERVICE TUBE EXTENSION
Figure 1
It is necessary to execute the soldering operation with
vane 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. "me extension fitted with the male Hansen is connected to the female fitting of the vacuum pump tube. (Figure 3)
CHARGE TUBE FEMALE EXTENSION HANSEN
,_ MALE HANSEN
SOLDERING POINT
Figure 2
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 -+5grams. (Figure 4)
TO THE R-134a CYLINDER
_, _ TOTHE REFRIGERATION
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)
FILLING OR VALVE TO BE OPENED CHARGE TUBE WHEN REFILLING
SYSTEM
I Figure 4
iS=
GAUGE
Air evacuating from the system begins as soon as the
pump starts. The refrigeration system must be kept under
vacuum until the reading on the low-pressure gauge
indicates vacuum (0 absolute, -1 arm., -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. If vacuum should not be obtained (pressure
gauge can't fall to 1 atmosphere), start the refdgeration
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 rebalanced when
vacuum is in the system when soldering. As soon as the
TO THE REFRIGERATION TO THE CHARGE SYSTEM CYLINDER
VALVE TO BE CLOSED AFTER VACUUM
TO THE VACUUM _ 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 mater-
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-
160/120
CIRCUITDIAGRAM _su._._lcomoL
_,_.._'_ERMOSTAT DEFRC_,TIMER
_: , _ fl"_nIhewal =eJet.
I. U. __,.
8 I I i- -- _ _ / =: _'Jli_ SW1 SW2 8W3 TIME
. . . I_ I !F I i- OFF OFF OFF 10.SsliC
e" II I I Ii I _ ,I _ T _ _'",_- _ i= OFF ON OFF 10SeC
! I ! i =-', I , I ! ON ON OFF11111_I
_; i i it !-:__...,=! _"! !
" I I I I _ OFF OFF ON 12
a;l_-:='l _Wl r__i_--_'l i [_'" _l'K c_eReaim BK ON OFF ON 13sec
I-J , I_ _clli_l = =r---- ---, OFF ON ON 14sec
L_4=.Fp_t I I , 'RD 3 ; , C
. LIWP.FpAR1.,C.llp/i:llO_l,1.AEI=LU6.l_pE,EiiR114piil_l._10 i_ _ Op1XlltpiCtT(Ill iliRCLirr SWITCHOFF "i" 2 3
1_48_,4H.Q_ 8Ug,JECT_10C_r4Q_IN[_'_RE_IT_, __J _
WI.I:'M.III_ BL:BLUE RD:RED eY:GRkYPURPLEYL:_tJ.OW BO:BRI6HTORkN_
BK:BIJ_ BN:BROWNPR:PURPLE_:F1NK GN:GR_N 3854JD1046C
_. D _ i BK
......... , -_ : _ , ON ON ON 15see
,"_ :Reue unptuothepo_r cord
$W1 _ SWI
2. PARTS IDENTIFICATION
FREEZER
COMPARTMENT
Freezer Shelf
Automatic Ice Maker
tce Cube Box
Lamp
Freezer Door Bin
Freezer Temperature
Control Dial
REFRIGERATOR
COMPARTMENT
Temperature
Control Dial
Lamp
Shelves
Egg Box
Snack Corner
Crisper
Used to keep fruits
and vegetables
fresh and crisp.
Base Grille
Push the gdlle toward
the refngerator
untilit snaps
intoplace.
Door Cooling
On the refrigerator door,
the cold air passageway is
installedto supply coldair to the doorsideof
the refrigerator
compa_ment. Egg Tray
Can Server
Dairy Corner Can Storage
Adjustable Door Bin
Refrigerator Door Rack
__ Leveling Screw
(Inside)
-5-
3. DISASSEMBLY
3-1 DOOR
Freezer Door
1=Remove the hinge cover by pulling it upwards.
2. Loosen hexagonal boltsfixing the upper hinge to the
body and liftthe freezer door.
HINGE COVER
BOLT
HINGE
Figure 6
3. Pull out the door gasket to remove from the door foam
assembly.
3-2 DOOR SWITCH
1. To remove the door switch, pull out it with a slotted type driver as shown in (figure 9).
Disconnect the lead wire from the switch.
LEAD WIRE
Figure 9
3-3 THERMOSTAT 1, Remove Control Box-R by loosening 2 screws attach_l to
ceiling of Refrigeratoroompartrnent (Figure 10)
2. Separate the thermostat and dial knob F,
3. Remove the thermostat by disconnecting the lead wire.
_ GASKET
Figure 7
Refrigerator Door
1. Loosen hexagonal bolts attaching the lower hinge to the
body to remove the refrigerator door only.
LOWER HINGE
Figure 8
2. Pull out the door gasket to remove from the door foam
assembly.
Figure 10
-6-
3-4 FAN AND FAN MOTOR
1, Remove the freezer shelf. (If your refrigerator have an
Ice Maker, disassemble the Ice maker first)
2. Remove the grille by pulling it out and by loosening a screw.
3. Remove the Fan Motor assembly by loosening 4 screws
and disassemble the shroud.
4. Pull out the fan and separate the Fan Motor and Bracket.
3-6 LAMP
REFRIGERATOR ROOM LAMP
Figure 16-1
SHROUD
Figure 12
3-5 DEFROST CONTROL ASSEMBLY
Defrost control assembly consists of Defrost Thermostat
and FUSE-M.
Defrost Thermostat functions to defrost automatically and it is attached to metal side of the Evaporator and senses
Temp.
Fuse-M is a safety device for preventing over-heating of the Heater when defrosting,
At the temperature of 770C, it stops the emission of heat
from the Heater.
1. Pull out the grille assembly.
2. Separate the connector connected with the Defrost Control assembly and replace the Defrost Control
assembly after cutting the Tie Wrap. (Figure 14)
SHROUD-F
DEF-THERMO
3-6-1 Refrigerator room lamp
1. Unplug the power cord from the outlet.
2. Remove refrigerator shelves.
3. Release the hooks on beth ends of the lamp shield and pull the shield downward to remove it.
4. Turn the lamp eeuntemlockwise.
5. Assemble in reverse order of disassembly. Replacement bulb must be the same specification as odginal.
(Max 40 W)
FREEZER ROOM LAMP
Figure 16-2
3-6-2 Freezer room lamp
1. Unplug refrigerator or d_sconnect power.
2. Reach behind light shield to remove bulb.
3. Replace bulb with a 25-watt appliance bulb,
4. Plug in refrigerator or reconnect power.
3-7 CONTROL BOX-R
1. First, remove all shelves in the refrigerator and Cor_rel Box-R by loosening 2 screws.
Figure 13
FUSE-M
HOLDER FUSE Figure 14
COVER LAMP_@ Figure 17
2. Remove the Control Box-R by pulling it downward.
3. Disconnect the lead wire on the right position and seperate timer, themostat, Lamp socket, etc.
-7-
4. ADJUSTMENT
4.1COMPRESSOR
4-1-1 Role
The compressor intakes low temperature and low pressure
gas evaporated from evaporator of the refrigerator, and condenses this gas to high temperature end high pressure
gas, and then plays delivering role to condenser,
4-1-2 Composition The compressor includes overload protection. The PTC
starter and OLP (overload protector) are outside the compressor. Since the compressor is manufactured to
tolerances of 1 micron, and is sealed in a dust - and
moisture - free environment, use extreme caution when repairing it.
4-1.3 Note for Usage
(1) Be careful not to allow over-vottage and over-current. (2) No Strike
If applying forcible power or strike (dropping or careless handling), poor operation and noise may occur.
(3) Use proper electric components appropriate to the
Compressor.
(4) Note to Keep Compressor.
If Compressor gets wet in the rain and rust in the pin of Hermetic Terminal, the result may be poor operation
and poor contact may cause.
(5) Be careful that dust, humidity, and welding flux don't
contaminate the compressor inside when replacing the Compressor. Dust, humidity, and flux due to welding
which contaminates the cylinder may cause iockage and noise.
4-2 PTC-STARTER
4-2-1 Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is a no-contact
semiconductor starting device which uses ceramic
matedal consisting of BaTiO3.
(2) The higher the temperature is, the higher the resistance
value. These features ere used as starting device for the Motor.
4-2-2 Role of PTC-Starter (1) PTC is attached to Hermetic Compressor used for
Refrigerator, Show Case, and starting Motor.
(2) Compressor for household refrigerator applies to
sfagio-phase induction Motor. For normal operation of the single-phase induction
motor, in the starting operation flows in both main coil and sub-coil. After the starting is over, the current in subooil is cut off. The proper features of PTC play all the above roles. So, PTC is used as a motor starting
devise.
4-2-3 PTC-Applied Circuit Diagram
According to Starting Method for the Motor
OVERLOAD PROTECTOR(O L.P)
@ c
I- -_-C- q = _"_ COMPRESSOR ' ' "_ MOTOR
PTC STARTER HERMETIC
RSIR
4-2-4 Motor Restarting and PTC Cooling (1) For restarting after power off during normal
Compressor Motor operation, plug the power cord after 5 rain. for pressure balance of Refrigerating Cycle and PTC cooling.
(2) During normal operation of the Compressor Motor, PTC
elements generate heat continuously. Therefore,
if PTC isn't cooled for a while after the power has been shut off, the motor witi not restart.
42-5 Relation of PTC-Starter and OLP
(1) If the power is off during operation of Compressor and
the power is on before the PTC is cooled, (instant shut- off within 2 tufa. or unplugging and reconnecting), the
PTC isn't cooled and a resistance value grows. As a
result, current can't flow to the sub-coil, the Motor can't operate, and the OLP operates by flowing over currant
in only in the main-coil.
(2) While the OLP repeats on and off operation about 3-5
times, PTC is cooled and Compressor Motor performs
normal operation. If DIP doesn't operate when PTC is not cooled,
Compressor Motor is worn away and causes circuit- short and fire. Therefore, always use a properly
attached OLR
4-2-6 Note to Use PTC-Starter (1) Be careful not to allow over-voltage and over-current.
(2) Do not strike
Don't apply a forcible power or strike,
(3) Keep apart from any liquid.
If liquid, such as oil or water away enters the PTC, PTC materials may fail due to insutation breakdown of
the material itself.
(4) Don't change PTC at your convenience.
Don't disassemble PTC and case. If the exterior to the PTC-starter is damaged, resistance value is altered and
it may cause poor starting of the compressor motor may
cause.
(5) Use a propedy attached PTC.
TERMINAL
Figure 19
-8-
4-30LP (OVERLOAD PROTECTOR)
4-3-1 Definition of OLP (1) OLP (OVERLOAD PROTECTOR) is attached to the
Compressor and protects the Motor by cutting the current to the Motor if the temperature dses and
activates the bimetal spring in the OLP.
(2) When over-voltage flows to Compressor motor, the
Bimetal works by heating the heater inside the OLP,
and the OLP protects Motor by cutting off current which
flows to the Compressor Motor.
4-3-2 Role of the OLP
(1) The OLP is attached to the Hermetic Compressor used
for the Refrigerator and prevents the Motor Coil from
being started in the Compressor.
(2) Do not turn the Adjust Screw of the OLP in any way for
normal operation of the OLR (Composition and connection diagram of OLP)
5. CIRCUIT DIAGRAM
CIRCUITDIAGRAM
"iI_E_OSTAT DEFFIOST.TIMER
CONTACTING POINT
ADJUST
SCREW
COVER
BIMETAL
BIMETAL
HEATER
WATERSUPPLYI_"riMECONTROLoPnoN ]
Figure 21
-9-
S_TCHNO
SWITCHOFF 2 3
SW1 SW2SW3
TIME
10.5s< 9se(
10se
11se 12se
13se 14s_
15se
3854,,ID1046C
6. TROUBLESHOOTING
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
Remove the PTC-
[_ Power Source.
Starter from the Compressor and
measure the voltage between Terminal C of
Compressor and Terminals 5 or 6 of PTC.
__ (Rating Voltage YES
±10%)? I "[_
]_No Voltage.
Applied voltage isn't
-]_| in the range of Rating L Voltage ±10%.
Check the I-_ Check the resistance
Motor M-S in Motor
resistance of I-[ among M-C, S-C and
Compressor. Compressor.
Check the _ Check the resistance
PTC-Starter. PTC-Starter.
resistance of I [ of two terminals in
[_ a regular OLR _, 130 sec. in forcible OLP
Check OLR
1= £
I--_[ Check if applying _'_ OLP works w_hin __O._ YEs i _[_
,_ OLP disconnected?
to use a regular Advise the customer I [_
transformer.
,Es
NO Replace
YES
I I I operation by turning Replace OLR
I I instant power on and
Replace OLR
C°%ceonect nh
L_ Reconnect. I
PTC-Starter.
1I°" f
NO
starting state, starting voltage after 5 the voltage of Rating
[5_ Check _ Measure minimum _ C°mponents start in _ O'K" I
min. for balancing cycle Voltage ±10% pressure and cooling the below. r_
PTC. NO
-10-
6-2 PTC AND OLP
Normal operation of In -_,
Compressor is
impossible or poor.
/
Separate the PTC- _1 Star_er from
Compressor and measure the
resistance between No. 5 and 6 of PTC- Starter with a Tester or
(Figure 21)
r
Observation value is ,_1
220VI50Hz : 22_)±30% 115V/6OHz : 6.8_+-30% 240V/50Hz : 33_2+-30%
127,220VI6OHz : 22{_
±30%
The resistance value _.=1 is 0 or several
hundred Q.
/
-I
r
Check another I
electric components. I
Starter
Replace PTC- I
6-3 DEFROST TIMER
Normal operation of
the Defrost Timer is
impossible.
I No defrosting.
I Poor cooling.
Wheatstone Bridge.
.J Separate the OLP from I YES_[
")'[ Compressor and check I "1
the resistance value
between two terminals I I | of OLP with a Tester. / (Figure 22)
the point of tirst click
r Position the Cam Shaft to
F Next, position the Cam
F No. 1 (brown) and
sound and check the current flowing between
terminals No. t(brown) and No. 2(bright orange).
Shaft to the point of second click sound and
check the current flowing between terminals
No. 4 (black) (Figure 23).
The value is =o.
electric components.
Check another I
Replace OLF_
F_Figure
21_igure 22
--_ The resistance is _,.
0_2orvariable.
._The resistanceis
220V/50Hz : 20K.q
._The resistance is about
115VI60Hz : 7.8K.Q
_ Replacethe
DefrostT_mer. I
_ Replace the
Defrost Timer. I
I_t Check the another I
electric components, I
--}_ Turn the Cam Shaft.
"_ with holding the Cam
Shake about 3 times
Shaft and Body softly.
-11 -
> Replace the
Defrost Timer. I
t--H I
Figure 23
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