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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
MODEL: GR-359/399
CONTENTS
SAFETY PRECAUTIONS ....................................................................................................................................................... 2
SERVICING PRECAUTIONS.................................................................................................................................................. 3
SPECIFICATIONS................................................................................................................................................................... 4
PARTS IDENTIFICATION ....................................................................................................................................................... 5
REPLACEMENT OF DOOR OPENING TYPE ....................................................................................................................... 6
DISASSEMBLY.................................................................................................................................................................... 7-8
DOOR................................................................................................................................................................................... 7
DOOR SWITCH.................................................................................................................................................................... 7
FAN AND FAN MOTOR ........................................................................................................................................................ 7
DEF' CONTROL ASM .......................................................................................................................................................... 8
LAMP.................................................................................................................................................................................... 8
ADJUSTMENT................................................................................................................................................................... 9-10
COMPRESSOR.................................................................................................................................................................... 9
PTC-STARTER ..................................................................................................................................................................... 9
OLP (OVER LOAD PROTECTOR) ..................................................................................................................................... 10
CIRCUIT DIAGRAM.............................................................................................................................................................. 10
TROUBLESHOOTING ..................................................................................................................................................... 11-16
COMPRESSOR AND ELECTRIC COMPONENTS ........................................................................................................... 11
PTC AND OLP.................................................................................................................................................................... 12
ANOTHER ELECTRIC COMPONENT ............................................................................................................................... 13
SERVICE DIAGNOSIS CHART.......................................................................................................................................... 14
REFRIGERATING CYCLE ............................................................................................................................................ 15-16
MICOM FUNCTION & PCB CIRCUIT EXPLANATION ................................................................................................... 17-34
EXPLODED VIEW .......................................................................................................................................................... 35-38
REPLACEMENT PARTS LIST ............................................................................................................................................ 39-
SAFETY PRECAUTIONS
Please read the following instructions before servicing your
refrigerator.
1. Check the set for electric losses. 8. When tilting the set, remove any materials on the set,
2. Unplug prior to servcing to prevent electric shock. especially the thin plates(ex. Glass shelf or books.)
3. Whenever testing with power on, wear rubber gloves to 9. When servicing the evaporator, wear cotton gloves.
prevent electric shock. This is to prevent injuries from the sharp evaporator
fins.
4. If you use any kind of appliance, check regular current,
voltage and capacity. 10. Leave the disassembly of the refrigerating cycle to a
specialized service center. The gas inside the circuit
5. Don't touch metal products in the freezer with wet
may pollute the environment.
hands. This may cause frostbite.
11. When you discharge the refrigerant, wear the
6. Prevent water from following onto electric elements in
protective safety glasses or goggle for eye safety.
the mechanical parts.
12. When you repair the cycle system in refrigerator, the
7. When standing up after having checked the lower
work area is well ventilated.
section of the refrigerator with the upper door open,
Especially if the refrigerant is R600a, there are no fire
move with care to avoid hitting the upper door.
or heat sources. (No smoking)
-2-
TUBE LOKRING
LOKRING JOINT
Figure 23. LOKRING
ASSEMBLY JAWS
BOLT
TOOL
Figure 24. LOKRING TOOL
- 17 -
SERVICING PRECAUTIONS
Features of refrigerant (R600a) After the refrigerant (R600a) is completely discharged, repair any
· Achromatic and odor less gas. defective parts and replace the dryer. At any case you must use the
· Flammable gas and the ignition (explosion) at 494°C. LOKRING for connecting or replacing any part in the cycle (No Fire,
· Upper/lower explosion limit: 1.8%~8.4%/Vol. No Welding). Connect the Schrader valve to pump with the coupler.
And then turn the pump on for vacuum state (Figure 3). Let the
Features of the R600a refrigerator pump run until the low-pressure gauge indicates the vacuum (gauge
· Charging of 60% refrigerant compared with a R134a model pressure 0, absolute pressure -1atm or -760mmHg). Recommended
· The suction pressure is below 1bar (abs) during the operation. vacuum time is 30 min. Charge the N2 gas in order to check for
· Because of its low suction pressure, the external air may leakage from welding points and the LOKRING. If leakages are
flow in the cycle system when the refrigerant leak, and it found, repair the defects and repeat the vacuum process.
causes malfunction in the compressor.
· The displacement of compressor using R600a must be at
least 1.7 times larger than that of R134a.
· Any type of dryer is applicable (XH-5, 7, 9).
· The EVAPORATOR or any other cycle part that has TO THE
welding joint is hidden in the foam. (If not hidden inside, VACUUM
PUMP
the whole electric parts must be tested with the
PRESSURE
LEAKAGE TEST according to the IEC Standard.) GAUGE
· The compressor has label of the refrigerant R600a. Figure 3
· Only the SVC man must have an access to the system.
Installation place After the system is completely vacuumed, fill it with the refrigerant
· Must be well ventilated. R600a up to what has been specified at your refrigerator Name
· Must be 20 m3 or larger. Plate. The amount of refrigerant (R600a) must be precisely
· Must be no-smoking area. measured within the error of ±2g by an electron scale (Figure 4).
· No ignitable factors must be present.
Utilities If you use the manifold connected with both the refrigerant
· Refrigerant cylinder (MAX NET 300g) (R600a) cylinder and the vacuum pump simultaneously,
make sure the pump valve is closed (Figure 5).
L
· Manometer
· Vacuum pump (600 /min)
REFRIGERANT
· Piercing Clamp (R600a)
· Quick coupler CHARGING HOSE
· Hoses (5m-1EA, 1m-3EA) COUPLE
· LOKRING
· Portable Leakage detector (3g/year)
· Nitrogen cylinder (for leakage test)
· Concentration gauge THROTTLE
VALVE
Make sure before Servicing
· Refrigerant Figure 4 WEIGH SCALE
Confirm the refrigerant by checking Name Plate and the label
on the compressor, after opening the COVER ASSY,
FILLING OR VALVE TO BE OPENED
BACK-M/C. CHARGE TUBE WHEN REFILLING
· If the refrigerant is R600a, you must not weld or apply a
heat source.
TO THE TO THE CHARGE
Air Recharging in Compressor REFRIGERATION CYLINDER
Before refilling the refrigerant, you must perform the test according SYSTEM
to Chapter 5 (TROUBLESHOOTING CHART). When the defects VALVE TO BE CLOSED
are found, you must discharge the residual refrigerant (R600a) in AFTER VACUUM
the outdoor. For discharging the refrigerant R600a, break the
narrow portion of tube extension by hand or with a pipe cutter as TO THE VACUUM PUMP Figure 5
shown in Figure 1. Leave it for 30min in outside to stabilize the
pressure with ambient. Then, check the pressure by piercing the Connect the charging hose (that is connected to the refrigerant
dryer part with piercing pliers. If the refrigerant is not completely (R600a) cylinder) to the Schrader valve installed on the service
discharged, let the refrigerator alone for more 30min in outside. tube. Then, charge the refrigerant (R600a) by controlling the
Throttle valve. When you do so, do not fully open the Throttle valve
POINT TO BE CHARGE TUBE
because it may make damage to the compressor. Gradually charge
BROKEN EXTENSION the refrigerant (R600a) by changing open and close the Throttle
Valve (5g at each time). The charging hose must use a one-way
valve to prevent the refrigerant refluence. Close the Schrader valve
cap after the refrigerant (R600a) is completely recharged.
SCHRADER VALVE
SERVICE TUBE
(ONE-WAY VALVE) After you completely recharge the refrigerant (R600a), perform the
EXTENSION LOKRING leakage test by using a portable leakage detector or soapy water.
Figure 1 Figure 2 Test the low pressure (suction) parts in compressor off time and
high pressure parts in compressor on time. If the leakages are
found, restart from the refrigerant (R600a) discharging process and
Attach the service tube installed with a Schrader valve (one-way repairs defects of leaks.
valve) by using the LOKRING (Figure 2). Then, connect the
Schrader valve (one-way valve) to the pump that is connected to After the leakage test, check the temperature of each parts of the
the discharging hose leading to the outside. When discharging the cycle. Check with hands if the CONDENSER and the case (HOT-
residual refrigerant, repeat 3 cycle that includes 3min of the pump LINE pipe) that is contacted to the door gasket are warm. Confirm
running->pump off->30sec of the compressor running. that frost is uniform distributed on the surface of the EVAPORATOR.
-3-
SPECIFICATIONS
1.Ref. No: GR-399
ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS
DIMENSIONS (mm) 595(W)X626(D)X1880(H) Transparent Shelf(3 EA)
NET WEIGHT (kg) 74 REFRIGERATOR Vegetable Container(2 EA)
COOLING SYSTEM Fan Cooling COMPARTMENT Vegetable Container Cover(1 EA)
TEMPERATURE REFRIGERATOR Knob Dial Chilled Container(1 EA)*
CONTROL
FREEZER Button Dairy Pocket Cover(1 EA)
Full Automatic Egg Tray(2 EA)
DEFROSTING SYSTEM DOOR POCKET
Heater Defrost Little Pocket(5 EA)
Pre-Coated Metal
DOOR FINISH Bottle Pocket(1 EA)
or Vinyl Coated Metal
OUT CASE Painted Steel Sheet FREEZER Tray Drawer(4 EA)
INNER CASE ABS COMPARTMENT Ice Tray(1 EA)
INSULATION Polyurethane Foam COMPRESSOR PTC Starting Type
DEFROSTING DEVICE Heater, Sheath & Heater, Cord-L EVAPORATOR Fin Tube Type
REFRIGERANT R600a(54g) CONDENSER Side & Wire Condenser
LUBRICATION OIL FREOL S10(280 cc) * Optional Parts
2.Ref. No: GR-359
ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS
DIMENSIONS (mm) 595(W)X626(D)X1710(H) Transparent Shelf(2 EA)
NET WEIGHT (kg) 69 REFRIGERATOR Vegetable Container(2 EA)
COOLING SYSTEM Fan Cooling COMPARTMENT Vegetable Container Cover(1 EA)
TEMPERATURE REFRIGERATOR Knob Dial Chilled Container(1 EA)*
CONTROL
FREEZER Button Dairy Pocket Cover(1 EA)
Full Automatic Egg Tray(1 EA)
DEFROSTING SYSTEM DOOR POCKET
Heater Defrost Little Pocket(3 EA)
Pre-Coated Metal
DOOR FINISH Bottle Pocket(1 EA)
or Vinyl Coated Metal
OUT CASE Painted Steel Sheet FREEZER Tray Drawer(4 EA)
INNER CASE ABS COMPARTMENT Ice Tray(1 EA)
INSULATION Polyurethane Foam COMPRESSOR PTC Starting Type
DEFROSTING DEVICE Heater, Sheath & Heater, Cord-L EVAPORATOR Fin Tube Type
REFRIGERANT R600a(54g) CONDENSER Side & Wire Condenser
LUBRICATION OIL FREOL S10(280 cc) * Optional Parts
-4-
PARTS IDENTIFICATION
Freezer Temperature
Control Egg Tray(1 or 2)
Removable Rotatable
Glass Shelf(2 or 3) Door Basket
(3 or 5)
Lamp
Multi-air Flow Duct
Fresh Meat Keeper
(Optional)
Utility Corner
Refrigerator (movable)
Temperature Control
Vegetable Drawer
Used to keep fruits Bottle Holder
and vegetables, etc.
fresh and crisp.
Ice Cube Tray
L
2 Bottle
Door Basket
Freezer
Compartment
Removable
Plinth
Leveling Screw
NOTE : This is a basic model. The shape of refrigerator is subject to change.
-5-
REPLACEMENT OF DOOR OPENING TYPE
1. PRECAUTION 2) Separating screw 10 and remove the center hinge 11
1) Before reversing the door, first of all, you should take and the refrigerator door 12 . Move the position of cap 13 .
out food and accessories like shelves or trays which are Move the position of bracket door 16 and screw 17 .
not fixed in the refrigerator. 3) Move the position of upper hinge pin 14 , and cap 15 .
2) Use Torque Wrench or Spanner to fix or remove the bolt. Assemble the refrigerator door 12 . Assemble center
3) Don't lay the refrigerator down in working with it, it will hinge 11 and bolt 10 . Assemble freezer door 21 .
cause to get out of order. Assemble the lower hinge , bolt and lower cover .
4) Be careful not to drop the door in disassembling or
assembling the freezer or the refrigerator door.
14
2. HOW TO REVERSE THE DOORS
1) Seperate screw and remove lower cover and move
cap lower cover . And, seperate screw , lower hinge
, and remove pin . Separating the freezer door in
opening, and more the position the cap . 21
Move the position of bracket door and screw .
7
6
5
4 15
21
3
8
9
1
2
12
11
12
10
13 11 10
16
17
21
5
4
1 2
-6-
DISASSEMBLY
1 DOOR 2 DOOR SWITCH
q Freezer Door 1) Loosen four screws in upper part and disconnect top
1) Loosen 2 screws and pull the Lower Cover. cover.
2) Loosen hexagonal bolts fixing the lower hinge to the 2) Disconnect Lead Wire from switch.
body to remove the freezer door only. 3) Disengage hook behind the switch by pressing it with
hands.
Lower Hinge
Bolt
Figure 6
Figure 9
3) Pull out the Door Gasket to remover from the
Door Foam Assy, F.
GASKET
3 REFRIGERATOR ROOM LAMP
1) Remove the Cover Lamp, R by pulling with a '' type
driver.
2) Remove the Lamp by turning.
Figure 7
q Refrigerator Door
1) Loosen hexagonal bolts fixing the center hinge(Hinge,C)
to the body to remove the refrigerator door only.
Figure 10
3) After removing the lamp, you must check
the O-RING, which is made by rubber and prevent
electric spark, in the socket.
Hinge, C
Bolt
Figure 8
2) Pull out the Door Gasket to remove from the
Door Foam Assy, R.
-7-
4 FAN AND FAN MOTOR 6 DAMPER CONTROL
1) Remove freezer drawers. 1) Remove the Cover Lamp, R and loosen 2 screw.
2) Remove two cap, screws and loosen two screws in Grille Fan. 2) Pull the Control Box, R and separate the lead wire
3) Pull out the Grille Fan and Shroud, F. housing.
4) Disconnect the housing of lead wire. 3) Remove the Cover Lamp, R.
5) Separate the Fan Assy. 4) Separate the Insulation Multi Duct and Control Box, R.
6) Losse 2 screw fixed to the Bracket. 5) Disassemble the Knob.
7) Pull out Shroud, F remove the Fan Motor Assy. 6) Separate the Damper Control and Control Box, R.
8) Separate the Motor Bracket and Rubber. 7) Separate the Damper Control and Resistor.
8) Disconnect the lead wire.
FAN MOTOR
REFRIGERATOR ROOM LAMP
SHROUD
GUIDE FAN
FAN
GRILLE
Figure 11
Figure 13
5 DEFROST CONTROL ASSY
Defrost Control Assy consists of Thermistor and Fuse, Melting.
Thermistor functions to defrost automatically and it is attached to 7 HEATER, SHEATH & HEATER, CORD-L
metal side of the Evaporator and senses temperature. In this refrigerator, Heater, Sheath & Heater, Cord-L are
Fuse, Melting is a kind of safety device for preventing overheating used for defrosting heater. During heating, the temperature
of the Heater when defrosting. of heater rises about 300~350°C. Therefore, be careful not
to burn while servicing.
At the temperature of 72°C, it stops the emission of heat from the
Heater. 1) After removing the Grille and Shroud, separate the
Heater, Sheath by disconnecting the connectors.
1) Pull out the Shroud, F after removing the Grille.
2) Exchanged Heater, Sheath and connected the housing.
2) Separate the connector connected with the Defrost Control
Assy and replace new one.
Thermister Heater, Cord-L
Fuse, Melting
Figure 12
Heater, Sheath
Figure 14
3) If the Heater, Cord-L is defected, disconnect the
connectors, and separate the Heater, Cord-L with
Long Nose.
4) Replace and assembly the Heater, Cord-L and connect
the connectors.
-8-
ADJUSTMENT
1 COMPRESSOR 3) PTC-Applied Circuit Diagram
1) Role q According to Starting Method for the Motor
The compressor intakes low temperature and low pressure
gas evaporated from Evaporator of the Refrigerator, and OVERLOAD
condenses this gas to high temperature and high pressure PROTECTOR(O.L.P)
gas, and then plays delivering role to Condenser.
2) Composition C
The Compressor is Composed of Compressor Apparatus COMPRESSOR
PTC
compressing gas, Compressor Motor moving Compressor S MOTOR
Apparatus and Case protecting Compressor Apparatus M
and Motor. There is Relay Assy (one set of PTC-Starter S
S M
and Over Load Protector (OLP)) in Compressor. On the 3 M
other hand, because the Compressor consists of
1/1000mm processing precision components and is sealed HERMETIC
after production in absence of dust or humidity, deal and PTC STARTER
TERMINAL
repair with care. RSIR
3) Note for Usage RELAY ASSY Figure 19
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike
If applying forcible power or strike (dropping or careless 4) Motor Restarting and PTC Cooling
dealing), poor operation and noise may occur. (1) For restarting after power off during normal
(3) Use proper electric components appropriate to the Compressor Motor operation, plug the power cord after
Compressor. 5 min. for pressure balance of Refrigerating Cycle and
(4) Note to Keep Compressor. PTC cooling.
If Compressor gets wet in the rain and rust in the pin of (2) During normal operation of the Compressor Motor, PTC
Hermetic Terminal, the result may be poor operation elements generate heat continuously. Therefore,
and poor contact may cause. if PTC isn't cooled for a while after the power has been
shut off, Motor can't operate again.
(5) Be careful that dust, humidity, and flux welding don't
inflow in the Compressor inside in replacing the 5) Relation of PTC-Starter and OLP
Compressor. Dust, humidity, and flux due to welding (1) If the power is off during operation of Compressor and
which inflows to Cylinder may cause lockage and noise. the power is on before the PTC is cooled, (instant shut-
off within 2 min. or reconnect a power plug due to
misconnecting), the PTC isn't cooled and a resistance
value grows. As a result, current can't flow to the sub-
2 PTC-STARTER coil and the Motor can't operate and the OLP operates
1) Composition of PTC-Starter by flowing over current in only in the main-coil.
(1) PTC (Positive Temperature Coefficient) is a no-contact (2) While the OLP repeats on and off operation about 3-5
semiconductor starting device which uses ceramic times, PTC is cooled and Compressor Motor performs
material and this material consists of BaTiO3. normal operation.
(2) The higher the temperature is, the higher becomes the If OLP doesn't operate when PTC is not cooled,
resistance value. These features are used as starting Compressor Motor is worn away and causes circuit-
device for the Motor. short and fire. Therefore, use a properly fixed OLP
without fail.
2) Role of PTC-Starter
(1) PTC is attached to Hermetic Compressor used for 6) Note to Use PTC-Starter
Refrigerator, Show Case and starts Motor. (1) Be careful not to allow over-voltage and over-current.
(2) Compressor for household refrigerator applies to (2) No Strike
single-phase induction Motor. Don't apply a forcible power or strike.
For normal operation of the single-phase induction (3) Keep apart from any liquid.
motor, in the starting operation flows in both main coil If liquid such as oil or water away enter the PTC,
and sub-coil. After the starting is over, the current in PTC materials it may break due to insulation breakdown
subcoil is cut off. The proper features of PTC play all of the material itself.
the above roles. So, PTC is used as a motor starting (4) Don't change PTC at your convenience.
device.
Don't disassemble PTC and mold. 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 properly fixed PTC.
-9-
CIRCUIT DIAGRAM
NOTE : 1. This is a basic diagram and specifications vary in different localities.
- 10 -
TROUBLESHOOTING (Mechanical Part)
1 COMPRESSOR AND ELECTRIC COMPONENTS
Power Remove the Relay Assy (Rating Voltage YES
1 Source. from the Compressor ±10%)? 2
and measure the voltage
between Terminal C of
Compressor and
Terminals M or S of
Relay Assy
No Voltage. 5
Applied voltage isn't Advise the customer
in the range of Rating to use a regular 5
Voltage ±10%. Trans.
Check the Check the resistance YES
2 3
resistance of among M-C, S-C and
Motor M-S in Motor NO Replace Compressor.
Compressor. Compressor. 3 4 5
YES
Check the Check the resistance of 4
3 resistance of two terminals in PTC-
NO Replace
PTC-Starter. Starter. Relay Assy 5
YES
OLP works within YES
Check if applying 5
4 Check OLP.
a regular OLP. 30 sec. in forcible
OLP operation by NO Replace
turning instant power Relay Assy
on and off.
Check Measure minimum Components start in YES
5 starting state. starting voltage after 5 the voltage of Rating O.K.
min. for balancing cycle Voltage ±10% below.
pressure and cooling the
PTC. NO
1
- 11 -
2 RELAY ASSY (PTC AND OLP)
Normal operation of Observation value is Check another
Compressor is Separate the Relay Assy 220V/50Hz : 22±30% electric
impossible or poor. from Compressor and 115V/60Hz : 6.8±30% components.
measure the resistance 240V/50Hz : 33±30%
between M and S with a 127, 220V/60Hz :
Tester or Whistone Bridge. 22±30%
(Figure 21)
Replace
The resistance value is 0
Relay Assy.
or serveral hundreds .
The value is .
Separate the Relay Assy YES Check another
from the Compressor and electric components.
check the resistance value
between two terminals of
OLP with a Tester. NO
(Figure 22)
Replace Relay Assy.
T
L N
2
C C
M S M S 3 2
Figure 21 Figure 22
- 12 -
3 ANOTHER ELECTRIC COMPONENTS
w Cooling is impossible
Compressor Check if current flows to
doesn't run. the following Cause.
components.
a. Thermistor Poor contacting.
b. Starting devices Shorted or broken.
c. OLP Poor contacting
or shorted.
d. Compressor coil Coil shorted.
Poor contacting Replace
e. Circuit Parts
or shorted. each component.
Running state of Check a starting
Low voltage. Raise the voltage.
Compressor is poor. voltage.
Check if current flows Poor contacting Replace
to starting devices. and broken. each component.
Check current flowing
in sub-coil of Shorted.
Compressor.
Check capacity of OLP. Lack of capacity.
The items described Coil of motor Replace
above are normal. Compressor. the compressor.
w Cooling ability is poor
Fan motor Check current flowing
in SWITCH, DOOR. Poor contacting.
doesn't run.
Replace
each component.
Check current flowing in the
MOTOR[MECH], FAN. Coil is shorted.
Much frost are sticked Check current flowing Replace
Shorted.
to the EVAPORATOR. of the following each component.
components.
· THERMISTOR
· FUSE, MELTING
Check current flowing Replace
of the following the Heater, Sheath
components. Defect on
· HEATER, SHEATH Heater, Cord-L Replace
· HEATER, CORD-L the Heater, Cord-L
- 13 -
4 SERVICE DIAGNOSIS CHART
COMPLAINT POINTS TO BE CHECKED REMEDY
Cooling is · Is the power cord unplugged from the outlet? · Plug to the outlet.
impossible. · Check if the power switch is set to OFF. · Set the switch to ON.
· Check if the fuse of power switch is shorted. · Replace a regular fuse.
· Measure the voltage of power outlet. · If voltage is low, wire newly.
Cooling ability · Check if the set is placed close to wall. · Place the set with the space of about 10cm.
is poor. · Check if the set is placed close to stove, gas · Place the set apart from these heat
· cooker and direct rays. · appliances.
· Is the ambient temperature high or · Make the ambient temperature below.
· the room door closed?
· Check if put in is hot. · Put in foods after cooled down.
· Did you open the door of the set too often · Don't open the door too often and close
· or check if the door is closed up? · it firmly.
· Check if the Damper Control is set to "cold-position". · Set the control to mid-position.
Foods in the · Is foods placed in cooling air outlet? · Place foods in high temperature section.
Refrigerator · (Front Part)
are frozen. · Check if the control is set to "cold-position". · Set the control to "mid-position".
· Is the ambient temperature below 5°C? · Set the control to "warm-position".
Dew or ice · Is liquid food stored? · Seal up liquid foods with wrap.
forms in the · Check if put in is hot. · Put in foods after cooled down.
chamber of · Did you open the door of the set too · Don't open the door too often and close
the set. · often or check if the door is closed up. · it firmly.
Dew forms · Check if ambient temperature and humidity · Wipe dew with a dry cloth. This occurrence
in the Exterior Case. of surroumcling air are high. · is solved naturally in low temperature and humidity.
· Is there gap in the door packed? · Fill up the gap.
Abnormal · Are the set positioned in a firm and even place? · Adjust the Adjust Screw, and position
noise generates. · in the firm place.
· Are any unnecessary objects set · Remove the objects.
· in the back side of the set?
· Check if the Tray Drip is not firmly fixed. · Fix it firmly on the original position.
· Check if the cover of mechanical room · Place the cover at the original position.
· in below and front side is taken out.
To close the door · Check if the door packing is dirty · Clean the door packing.
is not handy. · with filth such as juice.
· Is the set positioned in a firm and even place? · Position in the firm place and adjust the
· Adjust Screw.
· Is too much food putted in the set? · Keep foods not to reach the door.
Ice and foods · Check if the inside of the set is dirty. · Clean the inside of the set.
smell unpleasant. · Did you keep smelly foods without wrapping? · Wrap smelly foods.
· It smells of plastic. · The new products smells of plastic, but it is
· eliminated after 1-2 weeks.
q In addition to the items described left, refer to the followings to solve the complaint.
Replace the
Check if dew forms in Defrosting
Components of
the Freezer. is poor.
defrosting circuit.
Check Refrigerating The cycle
Repair the cycle.
Cycle. is faulty.
The operation of
Check the Replace the
the Damper
Damper Control Damper Control
Control is poor.
- 14 -
5 REFRIGERATING CYCLE
w Troubleshooting Chart
TEMPERATURE
STATE OF STATE OF THE
CAUSE OF THE REMARKS
THE SET EVAPORATOR
COMPRESSOR
PARTIAL Freezer room and Low flowing sound of A little high · A little Refrigerant
LEAKAGE Refrigerator Refrigerant is heard and more than · discharges.
don't cool frost forms in inlet only ambient · Normal cooling is possible
LEAKAGE
normally. temperature. · when injecting of Refrigerant
· the regular amount.
WHOLE Freezer room and Flowing sound of Refrigerant Equal to ambient · No discharging of Refrigerant.
LEAKAGE Refrigerator is not heard and frost isn't temperature. · Normal cooling is possible
don't cool formed. · when injecting of Refrigerant
normally. · the regular amount.
PARTIAL Freeze room and Flowing sound of Refrigerant A little high · Normal discharging of
CLOGGED BY DUST
CLOG Refrigerator is heard and frost forms more than · refrigerant.
don't cool in inlet only. ambient · The capillary tube is faulty.
normally. temperature.
WHOLE Freezer room and Flowing sound of Refrigerant Equal to ambient · Normal discharging of
CLOG Refrigerator is not heard and frost isn't temperature. · Refrigerant.
don't cool. formed.
MOISTURE Cooling operation Flowing sound of Refrigerant Low than · Cooling operation restarts
CLOG stops periodically. is not heard and frost melts. ambient · when heating the inlet of
temperature · capillary tube.
COMPRESSION
COMP- Freezer and Low flowing sound of A little high · The pressure of high
DEFECTIVE
RESSION Refrigerator Refrigerant is heard and than ambient · pressure part in
don't cool. frost forms in inlet only. temperature. · compressor is low.
NO COMP- No compressing Flowing sound of Refrigerant Equal to ambient · No pressure of high pressure
RESSION operation. is not heard and no frost. temperature. · part in the compressor.
w Leakage Detection
q Observe discharging point of refrigerant which may be in the oil discharging part in the compressor and hole of evaporator.
Whether frost
Whether Compressor YES forms or not in Whether oil
runs or not. Evaporator. No frost leaks or not.
or forms
in inlet only
Frost formed normally
Observe the discharged
Normal amount amount of Refrigerant.
No or much amount
YES
Faulty Inject Refrigerant to Compressor
Moisture Clog. and check cooling operation.
Compressor.
Check Compressor Clogged by dust. Gas leakage.
Frost formed normally (Check the leakage point)
- 15 -
w General Control of Refrigerating Cycle
NO. ITEMS CONTENTS AND SPECIFICATIONS REMARKS
WELDING (1) H 30
ROD (1) · Chemical Ingredients · Recommend H34 containing 34% Ag in the
(1) · Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20% · Service Center.
(1) · Brazing Temperature: 710~840°C
1 (2) Bcup-2
(1) · Chemical Ingredients
(1) · Cu: About 93%
(1) · P: 6.8~7.5%
(1) · The rest: within 0.2%
(1) · Brazing Temperature: 735~840°C
FLUX (1) · Ingredients and how to make · Make amount for only day. (1)
(1) ··Borax 30% · Holding period: 1 day
(1) ··Borax 35% · Close the cover of container to prevent dust
2 (1) · Fluoridation kalium: 35% · putting in the FLUX.
(1) · Water: 4% · Keep it in a stainless steel container.
(1) · Mix the above ingredients and boil until
(1) · they are transformed into liquid.
LOKRING (1) Both of the tube is inserted up to the stop. · For a hermetically sealed metal/metal
(Figure 23,24) (2) Both of the LOKRING is pushed up to the stop connection, the tube ends have to be clean.
(3) The bending point is not too close to the · LOKPREP is distributed all of out-surface of
3 joint ending. · the tube ends.
(4) During the assembly it is important that
both ends remain completely within the
joint.
DRIER (1) Assemble the drier within 30min. · Don't keep the drier in a outdoors because
ASM (1) after unpacking. · humidity damages to it.
4 (2) Keep the unpacked drier at the temperature
of 80~100°C.
VACUUM (1) When measuring with pirant Vacuum · Apply M/C Vacuum Gauge without fail.
(1 )gauge the charging M/C, vacuum · Perform vacuum operation until a proper
(1 )degree is within 1 Torr. · vacuum degree is built up.
(2) If the vacuum degree of the cycle inside is · If a proper vacuum degree isn't built up,·
(2) 10 Torr. below for low pressure and 20 Torr. · check the leakage from
(2) for high pressure, it says no vacuum · the Cycle Pipe line part and
5 (2) leakage state. · Quick Coupler Connecting part.
(3) Vacuum degree of vacuum pump must be
(3) 0.05 Torr. below after 5 min.
(4) Vacuum degree must be same to the
value described item (2) above for more than
20 min.
DRY AND (1) The pressure of dry air must be more
AIR han 12~16kg/cm2
(2) Temperature must be more than
6 NITROGEN
-20~-70°C.
GAS (3) Keep the pressure at 12~6kg/cm2 also
when substituting dry air for Nitrogen Gas.
NIPPLE (1) Check if gas leaks with soapy water. · Check if gas leaks from joint of the
7 AND (2) Replace Quick Coupler in case of leakage. · Coupler.
COUPLER
PIPE (1)· Put all Joint Pipes in a clean box and
8 (1)· cover tightly with the lid so that dust or
(1)· humidity is not inserted.
- 16 -
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
This description is made for GR-349, 389SQ. Please refer to overall PCB circuits for other models.
1 FUNCTION EXPOSITION
1) FUNCTION
(1) The refrigerator starts from optimum condition when electric power is first on. But the operation condition changes "Mid"
¨ "Mid/Max" ¨ "Max" ¨ "Min" ¨ "Min/Mid" ¨ "Mid" whenever pressing the FREEZE TEMP button.
(2) It returns to "Mid" conditions if power off and on again.
VACATION FREEZE TEMP QUICK FREEZE
NOTCH Min Min/ Mid Mid/ Max
Mid Max
TEMP(°C) -15 -16.5 -18 -19.5 -22
ROOM FREEZER
2) QUICK FREEZER
(1) Function to raise the freezing speed by operating the COMP successively. As pressing the QUICK FREEZE button, the
QUICK FREEZE LED is displayed. Then after 3 hours' successive operation of COMP, the QUICK FREEZING function
will be released.
(2) Defrosting During the QUICK FREEZING operates as follow.
When the QUICK FREEZING time is below 90 minutes, defrost and then operate the QUICK FREEZING for the
remaining time. When the QUICK FREEZING time is over 90 minutes, defrost and then operate the QUICK FREEZING
for 2 hours
(3) If QUICK FREEZE button is pressed during defrosting, the QUICK FREEZE LED is lit up. But the QUICK FREEZING
operates for 3 hours after 7 minutes from the end of defrosting.
(4) If VACATION button is pressed during the QUICK FREEZING, the QUICK FREEZING LED function is released.
(5) If power off during the QUICK FREEZING and power on again, the QUICK FREEZING function is released.
3) VACATION FUNCTION
(1) Function for Energy Saving. As pressing the VACATION button, the VACATION LED is displayed and this function is
operated.
(2) Freezer Compartment is not kept by compressor at the notch displayed but at -13°C± differential.
(3) Defrosting and Fan control is same as normal operation.
(4) If QUICK FREEZE button is pressed during the VACATION FUNCTION, VACATION FUNCTION is released.
(5) If power off during the VACATION FUNCTION and power on again, the VACATION FUNCTION is released.
- 18 -
4) DOOR OPENING ALARM
(1) When the REFRIGERATOR DOOR is opened and won't be closed after 1 minute from the its opened, BUZZER sounds
to notify it.
(2) At frist, BUZZER sounds three times at each intervals of 0.5 second. Then makes a 0.5 second ON/OFF alarm three
times at intervals of 30 seconds.
(3) If the REFRIGERATOR door closed during ALARM, it is released.
REFRIGERATOR
DOOR CLOSE OPEN CLOSE OPEN CLOSE
three three three
times times times
BUZZER
within 1 minute 30 30
1 minute seconds seconds
5) DISPLAY BUTTON RING
(1) If display function button(FREEZE TEMP, QUICK FREEZE, VACATION) of the front of the TOP COVER is pushed,
BUZZER rings with