REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
MODEL: GR-S552 / GR-S592
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SERVICING PRECAUTIONS
vacuum operation is over, add the quantity in grams of
Air Recharging in Compressor
R-134a to the refrigerant system. Remember that every
system has an exact quantity of R-134a with a tolerance of
±5 grams that can be added. (Figure 4)
Test the refrigeration by connecting it electrically before
refilling operation. It is necessary to ascertain the function
of the motor-compressor and identify the defects
immediately. If the defects have been found, empty the old
system of eventual 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 extension completely with male Hansen and
last, solder it to the same tube again. (Figure 2)
TO THE R-134a CYLINDER
POINT TO BE
CHARGE TUBE
BROKEN
EXTENSION
FEMALE
HANSEN
TO THE REFRIGERATION
SYSTEM
MALE HANSEN
Figure 4
SERVICE TUBE EXTENSION
SOLDERING POINT
Figure 1
Figure 2
Before performing this operation (if the vacuum pump and
refilling cylinder are connected), make sure that the valve
placed between the vacuum pump and refilling tube are
closed to keep the Freon for adding to the system. (Figure 5)
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 heating the point to be soldered.
FILLING OR
VALVE TO BE OPENED
WHEN REFILLING
CHARGE TUBE
The extension fitted with the male Hansen is connected to
the female fitting of the vacuum pump tube. (Figure 3)
TO THE REFRIGERATION
SYSTEM
TO THE CHARGE
CYLINDER
VALVE TO BE CLOSED
AFTER VACUUM
TO THE VACUUM
PUMP
Figure 5
TO THE VACUUM PUMP
PRESSURE
GAUGE
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 165
grams to the group, this amount will be reached when
R-134a has dropped to 585 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 and 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 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 making the pressure go down again.
Regulate 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 0.10 to 0.4
atmosphere.
Figure 3
Air evacuating from the system begins so 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 atm., -760 mm hg) in any
case it is advisable to keep the pump running for about 60
minutes. (Figure 3)
In case that a considerable leakage occurs and to stop the
vacuum pump will be necessary and 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
refrigeration unit and find the leakage with the special leak-
finder. When the defective soldering point is visible, re-do 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
block them, the pressure must be rebalanced when
vacuum is in the system in soldering. As soon as the
- 3 -
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1. SPECIFICATIONS
1-1 GR-S552
ITEMS
FREEZER
SPECIFICATIONS
ITEMS
FREEZER
REFRIGERATOR
SPECIFICATIONS
1 EA
114
SHELF
NET CAPACITY REFRIGERATOR
306
2 EA
( l )
TOTAL
420
VEGETABLE TRAY
EGG TRAY
Drawer Type
2 Pieces
DIMENSIONS (mm)
NET WEIGHT (kg)
755(W)
X689(D)X1777(H)
79
ICE TRAY
2 Pieces (Plastic)
1 Piece
COOLING SYSTEM
TEMPERATURE CONTROL
Fan Cooling
ICE BANK
Micom Control
Full Automatic
Heater Defrost
COMPRESSOR
EVAPORATOR
CONDENSER
REFRIGERANT
DEFROSTING DEVICE
P.T.C Starting Type
Fin Tube Type
Wire Condenser
R-134a (135g)
HEATER
DEFROSTING SYSTEM
OUT CASE
Pre Coated Metal
A B S
INNER CASE
INSULATION
Polyurethane Foam
1-2 GR-S592
ITEMS
FREEZER
SPECIFICATIONS
ITEMS
SPECIFICATIONS
1 EA
126
334
460
FREEZER
SHELF
NET CAPACITY REFRIGERATOR
REFRIGERATOR
2 EA
( l )
TOTAL
VEGETABLE TRAY
EGG TRAY
Drawer Type
2 Pieces
DIMENSIONS (mm)
NET WEIGHT (kg)
755(W)X719(D)X1777(H)
81
ICE TRAY
2 Pieces (Plastic)
1 Piece
COOLING SYSTEM
TEMPERATURE CONTROL
Fan Cooling
ICE BANK
Micom Control
Full Automatic
Heater Defrost
COMPRESSOR
EVAPORATOR
CONDENSER
REFRIGERANT
DEFROSTING DEVICE
P.T.C Starting Type
Fin Tube Type
Wire Condenser
R-134a (135g)
HEATER
DEFROSTING SYSTEM
OUT CASE
Pre Coated Metal
A B S
INNER CASE
INSULATION
Polyurethane Foam
- 4 -
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2. PARTS IDENTIFICATION
2-1 FEATURE CHART
FREEZER
COMPARTMENT
Lamp
Shelf
Freezer Temperature
Control Dial
Twisting Ice
Serve(Option)
or
Freezer Door Rack
General Type
Ice Making
REFRIGERATOR
COMPARTMENT
Deodorizer
Egg Storage Rack
Refrigerator
Temperature
Electronic Control
Fresh Meat
Lamp
Shelves
Vegetable Drawer
Used to keep fruits
and vegetables, etc.
fresh and crisp.
Leveling Screw
Base Cover
NOTE : This is a basic model. The shape of refrigerator is subject to change.
- 5 -
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3. DISASSEMBLY
3-1 DOOR
3-2 DOOR SWITCH
1. To remove the door switch, pull out it with a '—' type
driver as shown in (figure 9).
● Freezer Door
1. Remove the hinge cover by pulling it upwards.
2. Loosen hexagonal bolts fixing the upper hinge to the
body and lift the freezer door.
2. Disconnect the lead wire from the switch.
HINGE COVER
BOLT
HINGE
Figure 9
Figure 6
3-3 FAN AND FAN MOTOR
3. Pull out the door gasket to remove from the door foam
Ass'y.
1. Remove the freezer shelf.
2. Remove the Cover Lamp-F and Case Lamp by
loosening 1 screw fixed to ceiling of Inner Case.
GASKET
Figure 11
3. Remove the Grille by pulling it out.
Figure 7
4. Pull out the Shroud and remove the Fan Motor Assy by
loosening 2 screws.
5. Pull out the fan and, separate the Fan Motor, Brackets
and the Guide Fan.
● Refrigerator Door
1. Loosen hexagonal bolts fixing the lower hinge to the
body to remove the refrigerator door only.
FAN MOTOR
SHROUD
LOWER HINGE
BOLT
GUIDE FAN
FAN
GRILLE
Figure 8
Figure 12
2. Pull out the door gasket to remove from the door foam
Ass'y.
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3-5-1 Freezer room lamp
3-4 DEF' CONTROL ASSY
1. Unplug the power cord from the outlet.
Def control ASM consists of Defrost Sensor and FUSE–M.
2. Remove the room lamp lid by taking down while pulling
it forward with your hand after inserting finger into the
inside hole as shown in (figure 16).
Defrost Sensor functions to defrost automatically and it is
attached to the Evaporator and the metal side of the case
senses Temp.
3. Remove the lamp by turning it counterclockwise.
4. Assemble in reverse order of disassembly. Replacement
bulb must be the same specication as original.
Fuse-M is a kind of safety device for preventing over-
heating of the Heater when defrosting.
At the temperature of 77°C, it stops the emission of TEMP
from the Defrost Heater.
1. Pull out the shroud-F after removing the Grille Fan.
(Figure 13)
2. Separate the connectors connected with the Def Control
ASM and replace the Def Control ASM after cutting the
Tie Wrap. (Figure 14)
3-5-2 Refrigerator room lamp
1. Unplug the power cord from the outlet.
2. Remove refrigerator shelves.
3. Remove the room lamp lid by taking down while pulling
forward with your hands as shown in (figure 17).
4. Turn the lamp counterclockwise.
5. Assemble in reverse order of disassembly. Replacement
bulb must be the same specification as original.
SHROUD-F
FAN
DEF CONTROL ASM
3-6 CONTROL BOX-R
1. First, remove all shelves in the refrigerator and Control
Box-R by loosening 1 screw.
Figure 13
Figure 14
MULTI FLOW
DUCT
3-5 LAMP
FREEZER ROOM LAMP
REFRIGERATOR ROOM LAMP
Figure 18
2. Loosen 2 screws fixing the Control Box-R to the Inner
Case after detaching the cap screw.
Figure 16
Figure 17
3. Remove the Control Box-R by pulling it downward.
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4. ADJUSTMENT
4-2-3 PTC-Applied Circuit Diagram
● According to Starting Method of Motor
4-1 COMPRESSOR
4-1-1 Role
The compressor inhales low temperature and low pressure
gas evaporated from Evaporator of the Refrigerator, and
condenses this gas to high temperature and high pressure
gas, and then plays delivering role to Condenser.
OVERLOAD PROTECTOR
C
4-1-2 Composition
COMPRESSOR
MOTOR
PTC
The Compressor is Composed of Compressor Apparatus
compressing gas, Compressor Motor moving Compressor
Apparatus and Case protecting Compressor Apparatus
and Motor. There are PTC-Starter, and Over Load
Protector (OLP) in the Compressor outside. On the other
hand, because the Compressor consists of 1/1000mm processing
precision components and is sealed after producing without dust
or humidity, deal and repair with care.
5
M
S
S
M
6
3
HERMETIC
TERMINAL
PTC STARTER
RSIR
Figure 20
4-1-3 Note to Use
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike
If applying forcible power or strike (dropping or careless
dealing), poor operation and noise may occur.
(3) Use proper electric components appropriate to the
Compressor.
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 min. for pressure balance of Refrigerating Cycle and
PTC cooling.
(2) During normal operation of Compressor Motor, PTC
elements generate heat continuously. Therefore,
if PTC isn't cooled for a while after power off, Motor
can't operate again.
(4) Note to Keep Compressor.
If Compressor gets wet in the rain and rust in the pin of
Hermetic Terminal, poor operation and poor contact
may cause.
4-2-5 Relation of PTC-Starter and OLP
(5) Be careful that dust, humidity, and flux due to welding
don't inflow in Compressor inside in replacing
(1) If power off during operation of Compressor and power
on before PTC is cooled, (instant shut-off within 2 min.
or reconnect a power plug due to misconnecting),
PTC isn't cooled and a resistance value grows. As a
result, current can't flow to the sub-coil and Motor can't
operate and OLP operates by flowing over current in
only main-coil.
Compressor. Dust, humidity, and flux due to welding
which inflows to Cylinder may cause lock and noise.
4-2 PTC-STARTER
(2) While the OLP repeats on and off operation about 3-5
times, PTC is cooled and Compressor Motor performs
normal operation.
4-2-1 Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is no-contact
semiconductor starting device which uses ceramic
material and the material consists of BaTiO3.
(2) The higher the temperature is, the higher resistance
value becomes . These features are used as starting
device of Motor.
If OLP doesn't operate when PTC is not cooled,
Compressor Motor is worn away and causes circuit-
short and fire. Therefore, use a proper fixed OLP
without fail.
4-2-6 Note to Use PTC-Starter
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike
4-2-2 Role of PTC-Starter
(1) PTC is attached to Hermetic Compressor used for
Refrigerator, Show Case and starts Motor.
Don't apply a forcible power or strike.
(3) Keep apart from any liquid.
(2) Compressor for household refrigerator applies single-
phase induction Motor.
For normal operation of single-phase induction motor, in
the starting operation flows in both main coil and sub-
coil. After the starting is over, the current is cut off in
subcoil. The proper features of PTC play the above all
roles. So, PTC is used as a starting device of motor.
If liquid such as oil or water inflows into PTC,
PTC materials it may break due to insulation
breakdown of material itself.
(4) Don't change PTC at your convenience.
Don't disassemble PTC and mold. If damaging to
outside of PTC-starter, resistance value alters and poor
starting of compressor motor may cause.
(5) Use a properly fixed PTC.
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4-3 OLP (OVER LOAD PROTECTOR)
4-3-1 Definition of OLP
CONTACTING
POINT
COVER
(1) OLP (OVER LOAD PROTECTOR) is attached to
Hermetic Compressor and protects Motor by cutting off
current in Compressor Motor by Bimetal in the OLP in
case of over-rising temperature.
BIMETAL
CONTACTING
POINT
(2) When over-voltage flows to Compressor motor, Bimetal
works by heating the heater inside OLP,
HEATER
and OLP protects Motor by cutting off current which
flows to Compressor Motor.
TERMINALS
4-3-2 Role of OLP
(1) OLP is attached to Hermetic Compressor used to
Refrigerator and Show Case and prevents Motor Coil
from being started in the Compressor.
(2) Do not turn the Adjust Screw of OLP in any way for
normal operation of OLP.
BIMETAL
ADJUST
SCREW
(Composition and connection Diagram of OLP)
Figure 21
HEATER
5. CIRCUIT DIAGRAM
NOTE : 1. This is a basic diagram and specifications vary in different localities.
- 9 -
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6. TROUBLESHOOTING
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
YES
(Rating Voltage
±10%)?
Remove the PTC-Starter
from the Compressor
and measure the voltage
between Terminal C of
Compressor and
Power Source.
1
2
Terminals 5 or 6 of PTC.
YES
No Voltage.
OLP disconnected?
Replace OLP.
5
Check connection
condition.
Reconnect.
Advise the customer
to use a regular
Trans.
Applied voltage isn't
in the range of Rating
Voltage ±10%.
5
YES
Check the
resistance of
Motor
Check the resistance
among M-C, S-C and
M-S in Motor
3
5
2
3
NO
Replace Compressor.
Compressor.
Compressor.
3
4
YES
NO
Check the resistance
of two terminals in
PTC-Starter.
Check the
resistance of
PTC-Starter.
4
5
Replace
PTC-Starter.
YES
YES
Check if applying
a regular OLP.
OLP works within
30 sec. in forcible
OLP operation by
turning instant power
on and off.
5
Check OLP.
4
5
NO
Replace OLP.
NO
YES
Check
starting state.
Measure minimum
starting voltage after 5
min. for balancing cycle
pressure and cooling
the PTC.
Components start in
the voltage of Rating
Voltage ±10%
O.K.
below.
1
NO
- 10 -
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6-2 PTC AND OLP
Check another
electric components.
Normal operation of
Compressor is
impossible or poor.
Observation value is
Separate the PTC from
Compressor and
220V/50Hz : 47Ω ± 30%
220 - 240V/50Hz : 47Ω ± 30%
110 -115V/60Hz : 6.8Ω ± 30%
220V/60Hz : 47Ω ± 30%
127V/60Hz : 22Ω ± 30%
measure the resistance
between No. 5 and 6
(only RSIR Type) or No.
4 and 5 of PTC with a
Tester or Whistone
Replace
PTC.
Bridge. (Figure 22)
The resistance value is
0 or several
hundreds Ω.
The value is ∞.
YES
NO
Check another
electric components.
Separate the OLP
from Compressor and
check resistance
value between two
terminals of OLP with
a Tester. (Figure 23)
Replace OLP.
4
6
5
3
Figure 23
Figure 22
- 11 -
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6-3 ANOTHER ELECTRIC COMPONENTS
▼ Cooling is impossible
Compressor
doesn't run.
Check if current flows to
the following
Cause.
components.
a. Thermistor
Poor contacting.
b. Starting devices
c. OLP
Shorted or broken.
Poor contacting
or shorted.
d. Compressor coil
e. Circuit Parts
Coil shorted.
Replace
each component.
Poor contacting
or shorted.
Running state of
Compressor is poor.
Check a starting
voltage.
Low voltage.
Raise the voltage.
Check if current flows
to starting devices.
Poor contacting
and broken.
Replace
each component.
Check current flowing
in sub-coil of
Shorted.
Compressor.
Check capacity of OLP.
Lack of capacity.
The items described
above are normal.
Coil of motor
Compressor.
Replace
the compressor.
▼ Cooling ability is poor
Fan motor
doesn't run.
Check current flowing
in door S/W.
Poor contacting.
Replace
each component.
Check current flowing
in the Fan Motor.
Coil is shorted.
Shorted.
Replace
each component.
Check current flowing
of the following
components.
Much frost are sticked
to the EVAPORATOR.
• Def. Sensor
• FUSE-M
Check current flowing
of the following
components.
Replace
each component.
• Sheath Heater
- 12 -
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6-4 SERVICE DIAGNOSIS CHART
COMPLAINT
POINTS TO BE CHECKED
REMEDY
Cooling is
impossible.
• Is the power cord unplugged from the outlet?
• Check if the power S/W is set to OFF.
• Check if the fuse of power S/W is shorted.
• Measure the voltage of power outlet.
• Plug to the outlet.
• Set the switch to ON.
• Replace a regular fuse.
• If voltage is low, wire newly.
Cooling ability
is poor.
• Check if the set is placed close to wall.
• Check if the set is placed close to stove, gas
• cooker and direct rays.
• Place the set with the space of about 10cm.
• Place the set apart from these heat
• appliances.
• Is the ambient temperature high or
• the room door closed?
• Make the ambient temperature below.
• Check if putting in hot foods.
• Put in foods after they get cold.
• Don't open the door too often and close
• it firmly.
• Did you open the door of the set too often
• or check if the door is closed up?
• Check if the Control is set to "Min".
• Set the control to mid-position.
Foods in the
Refrigerator
are frozen.
• Are foods placed in cooling air outlet?
• Place foods in high temperature section.
• (Front Part)
• Set the Display LED to "Mid".
• Set the Display LED to "Min".
• Check if the Display LED is set to "Max".
• Is the ambient temperature below 5°C?
Dew or ice
forms in the
chamber of
the set.
• Is watery foods kept?
• Seal up watery foods with wrap.
• Put in foods after they get cold.
• Don't open the door too often and close
• it firmly.
• Check if putting in hot foods.
• Did you open the door of the set too
• often or check if the door is closed up.
Dew forms
in the Out Case.
• Check if ambient temperature and humidity
of surroumcling air are high.
• Wipe dew with a dry cloth. This happening
• is solved in low temperature and humidity
• naturally.
• Is the gap in the door packed?
• Fill up the gap.
Abnormal
noise generates.
• Is the set positioned in a firm and even place?
• Adjust the Adjust Screw, and position
• in the firm place.
• Does any unnecessary objects exist
• in the back side of the set?
• Remove the objects.
• Check if the Drip Tray is not firmly fixed.
• Check if the cover of mechanical room
• in below and front side is taken out.
• Fix it firmly on an original position.
• Place the cover at an original position.
To close the door
is not handy.
• Check if the door packing becomes dirty
• by filth such as juice.
• Clean the door packing.
• 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
smell unpleasant.
• Check if the inside of the set becomes dirty.
• Did you keep smelly foods without wraping?
• It smells plastic.
• Clean the inside of the set.
• Wrap smelly foods.
• The new products smell plastic, but it is
• removed after 1-2 weeks.
● In addition to the items described left, refer to the followings to solve the complaint.
Replace the
Components of
defrosting circuit.
Check if dew forms in
the Freezer.
Defrosting
is poor.
The cycle
is faulty.
Check Refrigerating
Cycle.
Repair the cycle.
The operation of
the Thermistor is
poor.
Check the
Thermistor
Replace the
Thermistor.
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6-5 REFRIGERATING CYCLE
▼ Troubleshooting Chart
TEMPERATURE
OF THE
COMPRESSOR
STATE OF
CAUSE
STATE OF THE
EVAPORATOR
REMARKS
THE SET
PARTIAL
LEAKAGE
Freezer and
Refrigerator
don't get cold
normally.
Low flowing sound of
Refrigerant is heard and
frost forms in inlet only
A little high
more than
ambient
• A little Refrigerant
• discharges.
• Normal cooling is possible
• when injecting Refrigerant
• of regular amount.
temperature.
WHOLE
LEAKAGE
Freezer and
Refrigerator
don't get cold
at all.
Flowing sound of Refrigerant Equal to ambient
• No discharging of Refrigerant.
• Normal cooling is possible
• when injecting Refrigerant
• of regular amount.
is not heard and frost isn't
formed.
temperature.
PARTIAL
CLOG
Freeze room and
Refrigerator
don't get cold
normally.
Flowing sound of Refrigerant A little high
• Normal discharging of
• refrigerant.
• The capillary tube is faulty.
is heard and frost forms
in inlet only.
more than
ambient
temperature.
WHOLE
CLOG
Freezer and
Refrigerator
don't get cold.
Flowing sound of Refrigerant Equal to ambient
• Normal discharging of
• Refrigerant.
is not heard and frost isn't
formed.
temperature.
MOISTURE
CLOG
Cooling operation Flowing sound of Refrigerant Low than
• Cooling operation restarts
• when heating the inlet of
• capillary tube.
stops periodically. is not heard and frost melts.
ambient
temperature
COMP-
RESSION
Freezer and
Refrigerator
don't get cold.
Low flowing sound of
Refrigerant is heard and
frost forms in inlet only.
A little high
than ambient
temperature.
• The pressure of high
• pressure part in
• compressor is low.
NO COMP- No compressing
RESSION operation.
Flowing sound of Refrigerant Equal to ambient
is not heard and no frost. temperature.
• No pressure of high pressure
• part in compressor.
▼ Leakage Detection
Observe discharging point of refrigerant which may be in oil discharging part in compressor and hole of evaporator.
Whether frost
forms or not in
Evaporator.
Whether oil leaks
or not.
Whether Compressor
runs or not.
YES
No frost or forms
in inlet only
Normal formed frost
Observe the discharging
amount of Refrigerant.
Normal amount
YES
No or much amount
Inject Refrigerant to
Compressor and check
cooling operation.
Faulty
Compressor.
Moisture Clog.
Check Comprossor
Clogged by dust.
- 14 -
Gas leakage.
(Check the leakage point)
Normal formed
frost in Evaporator
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▼ General Control of Refrigerating Cycle
NO.
ITEMS
CONTENTS AND SPECIFICATIONS
(1) H 30
(1) • Chemical Ingredients
(1) • Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20%
(1) • Brazing Temperature: 710~840°C
(2) Bcup-2
REMARKS
WELDING
ROD
• Recommend H34 containing 34% Ag in the
• Service Center.
1
(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
(1) ••Borax 30%
• Make amount for only a day.
• Holding period: 1 day
(1)
(1) ••Borax 35%
(1) • Fluoridation kalium: 35%
(1) • Water: 4%
• Close the cover of container to prevent dust
• putting in the FLUX.
• Keep it in a stainless steel container.
2
3
(1) • Mix the above ingredients and boil until
(1) • they are transformed into liquid.
DRIER
ASM
(1) Assemble the drier within 30min.
(1) after unpacking.
(2) Keep the unpacked drier at the temperature
of 80~100°C.
• Don't keep the drier in a outdoor because
• humidity damages to it.
VACUUM
(1) When measuring with pirant Vacuum
(1 )gauge of charging M/C, vacuum
(1 )degree is within 1 Torr.
• Apply M/C Vacuum Gauge without fail.
• Perform vacuum operation until a proper
• vacuum degree is built up.
(2) If the vacuum degree of the cycle inside is
(2) 10 Torr. below for low pressure and 20 Torr.
(2) for high pressure, it says no vacuum
(2) leakage state.
• If a proper vacuum degree isn't built up,•
• check the leakage from
• the Cycle Pipe line part and
4
• 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
AIR
(1) The pressure of dry air must be more
than 12~16Kg/cm2
NITROGEN
GAS
(2) Temperature must be more than
5
-20~-70°C.
(3) Keep the pressure to 12~6Kg/cm2 also
(3) when substituting dry air for Nitrogen Gas.
NIPPLE
AND
COUPLER
(1) Check if gas leaks with soapy water.
(2) Replace Quick Coupler in case of leakage.
• Check if gas leaks from connecting part of
• Coupler.
6
7
PIPE
(1)• Put all Joint Pipe in a clean box and
(1)• cover tightly with the lid so that dust or
(1)• humidity is not inserted.
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7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM
The following description is basically for GR-S552/GR-S592. For the other models, refer to the diagram of the entire PCB
circuit.
7-1 FUNCTION
7-1-1 FUNCTION
1. When the appliance is plugged in, it is set to ‘Medium’. Each time the button is pushed, it is set to
‘Medium’→‘Medium/High’→‘High’→‘Low’→‘Medium/Low’→‘Medium’ in order.
2. When the power is initially applied or restored after a power failure, it is automatically set to ‘Medium’.
Low
6
Medium/Low
4.5
Medium
Medium/High
0.5
High
-1
Temp
Control
TEMP(°C)
2.5
REFRIGERATOR
ROOM
7-1-2 CONTROL OF VARIABLE SPEED FAN IN THE FREEZER COMPARTMENT
1. Fan motor in the freezer compartment shall change from standard to high speed rpm in order to increase cooling speed
and load corresponding speed.
2. High speed rpm is only used for the initial power application and load corresponding operation. But standard rpm is used
in the general working condition.
3. When the door of freezer room or refrigerator room is opened, the fan motor is stoped immediately, then when the door is
closed, the fan motor is operated.
7-1-3 CONTROL OF DOUBLE COOLING FAN IN THE REFRIGERATOR COMPARTMENT
1. To raise the refrigerating speed, fan motor in the refrigerator compartment is operated when the door of freezer room or
refrigerator room is opened and then closed.
2. The fan motor is stoped after 20 sec. When the door is dosed.
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7-1-4 DEFROSTING
1. The defrosting is performed each time when the total running time of the compressor reaches 7 hours.
2. After the power is turned on (or restored after a power failure), the defrosting starts when the total running time of the
compressor reaches 4 hours.
3. When the temperature of the defrosting sensor reaches 10 °C or above, the defrosting stops. If the temperature does not
reach 10 °C in 2 hours after the defrosting starts, the defrosting error code is displayed.
(Refer to 7-1-6 Error Diagnostic Mode.)
4. With the defective defrosting sensor (cut or short-circuited wire), the defrosting will not be performed.
7-1-5 SEQUENTIAL OPERATION OF ELECTRIC COMPONENTS
The electric components, such as the comp, defrosting heater, and cooling fan, start sequentially to avoid the noise and
damage to the part, which may result from the simultaneous start of various components on turning the power on or after
the completion of a test.
Condition of Operation
Operating Sequence
If the temp of the defrosting
sensor is 45 °C or above
(For the initial use after the
purchase or grounding)
POWER
ON
in 0.5 sec
in 0.5 sec
COMP & COOLING FAN
ON
POWER
ON
DEFROSTING
HEATER ON
in 10 sec
DEFROSTING
HEATER OFF
If the temp of the defrosting
sensor is below 45 °C
(After a power failure or SVC)
in 0.5 sec COMP & COOLING FAN
ON
- 17 -
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7-1-6 ERROR DIAGNOSTIC MODE
1. The error diagnostic mode allows the SVC when a fault that may affect the performance of the product occurs while
operating the product.
2. Even if the function control button is pushed when an error occurs, the function will not be performed.
3. When the error is cleared while the error code is displayed due to a fault, the appliance returns to the normal condition
(Reset).
4. The error code is displayed by the refrigerator temp indication LED on the display of the refrigerator while the remaining
LEDs are off.
R1 R2 R3 R4
: ON
: OFF
Error Code Display
R1 R2 R3 R4
State of Operation with Error
NO
Error
Cause
Comp / Cooling fan Defrosting heater
Faulty refrigerator(R)
sensor (on the control
box of the refrigerator)
Cut or short-circuited wire of
refrigerator sensor
15 min ON/
15 min OFF
1.
Cut or short-circuited wire of
defrosting sensor
No defrosting
2. Faulty defrosting sensor
Cut or disconnected wire of
defrosting heater or temperature
fuse(indicated at least 2 hours
later after the error occurs)
3.
Defrosting failure
- 18 -
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7-2 PCB FUNCTION
7-2-1 POWER CIRCUIT
The secondary part of the TRANS is composed of the power supply for the display and relay drive (12Vdc) and that for the
MICOM and IC (5Vdc).
The voltage for each part is as follows.
PART
VA 1
CE 2
CE3
VOLTAGE
220 Vac
12 Vdc
5 Vdc
VA1 is a part for preventing the over voltage and noise. When 385V or higher power is applied, the inside elements are
short-circuited and broken, resulting in the blowout of the fuse in order to protect the elements of the secondary part of the
TRANS.
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7-2-2 OSCILLATION CIRCUIT
This circuit is to generate the base clock for calculating time and the synchro clock for transmitting data from and to the
inside logic elements of the IC1(MICOM). Be sure to use the authentic parts since the calculating time by the IC1 may be
changed or it will not work if the OSC1 SPEC is changed.
7-2-3 RESET CIRCUIT
The RESET circuit is for allowing all the functions to start at the initial conditions by initializing various parts including the
RAM inside the MICOM (IC1) when the power is initially supplied or the power supply to the MICOM is restored after a
momentary power failure. For the initial 10ms of power supply, ‘LOW’ voltage is applied to the MICOM RESET terminal.
During a normal operation, 5V is applied to the RESET terminal. (If a trouble occurs in the RESET IC, the MICOM will not
work.)
- 20 -
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7-2-4 LOAD DRIVE CIRCUIT
1. Load Drive Condition Check
Freezer Fan Motor
High RPM Standard RPM
No. 14
Double Cooling
Fan Motor (R-Fan)
No. 12
Defrosting
Heater
Comp
Load Type
Measurement Location (IC5)
No. 16
No. 13
No. 15
1V or below
12V
ON
Condition
OFF
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7-2-5 TEMPERATURE SENSOR CIRCUIT
The upper CIRCUIT reads REFRIGERATOR temperature and DEF-SENSOR temperature for defrosting into MICOM.
OPENING or SHORT state of each TEMPERATURE SENSOR are as follows.
SENSOR
CHECK POINT
NORMAL(-30 °C ~ 50 °C)
SHORT-CIRCUITED
OPEN
A
B
Refrigerator Sensor
Defrosting Sensor
POINT
POINT
Voltage
Voltage
0.5 V ~ 4.5 V
0 V
5 V
7-2-6 DOOR OPEN DETECTION CIRCUIT
Measurement Location
Freezer / Refrigerator Door
(Pin No.13)
Closed
Open
0V
5V
- 22 -
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7-2-7 TEMPERATURE COMPENSATION & OVERCOOLING/UNDERCOOLING COMPENSATION CIRCUIT
1. Refrigerator Temperature Compensation
Refrigerator
Resistance
(RCR1)
180 KΩ
56 KΩ
33 KΩ
18 KΩ
12 KΩ
10 KΩ
8.2 KΩ
5.6 KΩ
3.3 KΩ
2 KΩ
Temperature
Compensation
+2.5 °C
+2.0 °C
+1.5 °C
+1.0 °C
+0.5 °C
0 °C
Remark
Compensation by
raising the
temperature
Standard Temperature
-0.5 °C
Compensation by
lowering the
temperature
-1.0 °C
-1.5 °C
-2.0 °C
470 Ω
-2.5 °C
➧ Table of Temperature Compensation by adjusting the resistance (Difference with the current temperature)
E.g.) If the refrigerator compensation resistance (RCR1) is changed from 10K (the current resistance) to 18K
(the adjustment resistance), the temperature of the refrigerator rises +1.0 °C.
- 23 -
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7-2-8 KEY BUTTON INPUT & DISPLAY LIGHT ON CIRCUIT
➧ The circuit shown above is to determine whether a function control key on the operation display is pushed and to turn on
the corresponding function indication LED. The drive type is the scan type.
- 24 -
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7-3 RESISTANCE SPECIFICATION OF SENSOR
TEMPERATURE SENSOR
RESISTANCE OF REFRIGERATOR
(DEFROST) SENSOR
- 20 ˚C
- 15 ˚C
- 10 ˚C
- 5 ˚C
77 KΩ
60 KΩ
47.3 KΩ
38.4 KΩ
30 KΩ
0 ˚C
+ 5 ˚C
24.1 KΩ
19.5 KΩ
15.9 KΩ
13 KΩ
+ 10 ˚C
+ 15 ˚C
+ 20 ˚C
+ 25 ˚C
+ 30 ˚C
+ 40 ˚C
+ 50 ˚C
11 KΩ
8.9 KΩ
6.2 KΩ
4.3 KΩ
• The resistance of SENSOR has ±5% common difference.
• Measure the resistance of SENSOR after leaving it over 3 minutes in measuring temperature.
This postponing is necessary because of perceiving speed.
• Measure the F-SENSOR, SUPER FROST SENSOR, R1, R2-SENSOR after disconnect CON5 of PWB ASSY, MAIN.
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7-5 MAIN PWB ASS'Y AND PARTS LIST
7-5-1 MAIN PWB ASS'Y
1. R-B52DZ/R-B55DZ
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7-5-2 REPLACEMENT PARTS LIST
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7-5-3 PWB ASS'Y, DISPLAY AND PARTS LIST
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7-6 PWB DIAGRAM
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8. EXPLODED VIEW
▼ The parts of refrigerator and the shape of each part are subject to change in different localities.
: optional parts
*
301A
281A
401A
103B
103A
281B
281C
129A
411A
501F
501A
418A
410G*
410H*
409A
282A
406B
158B
282B
501K
158A
304A
410J
105A
317A
283B
318A
409B
310A
307A
106A
314A
308A
309A
323B
158C
104A
106A
329C
420A
327A
328A
312A
328B
319A
329D
158F
120A
315A
319C
103C
315B
315C
324A
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: optional parts
*
405C
200A
404A
405C
330B
405A
203A
205A
201A
329A
332A
212G
*
205A
212A
212C
125A
*
149A
*
125H
*
131C
*
*
149A
*
*
210B
210A
131A
136A
131A
*
136B
125A
*
*
230A
125A
*
235A
149B
233A
*
234B
149B
233B
*
*
231A
136N
136P
*
149C
*
140A
205A
*
or
241A
149C
*
244A
244C
136Q
*
136R
241C
*
154A
205A
or
241A
151A
241D
243A
243B
155K
151A
- 34 -
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