TC 3520* from Index 20assi.lhg.liebherr.com/Serviceline/b2b/bab2b/Media/... · 2018. 7. 18. ·...

1 | P a g e

Appliance Documentation

TC 3520* from Index 20

TC 2620* from Index 20

Combined Fridge-Freezer No Frost

01201800SM

Remarks : * models name & Specifications changed as per actual cluster, Refrence photo only.

After Sales Service International

Service Documentation Service Manual No. 01/2018 LHI/KDT-rav/01.06.2018

2 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20

Safety Precautions :

Please read the following basic rules prior servici ng your Refrigerator :

Check if any electric leakage occurs in your Refrigerator.

To Prevent electric shock ,unplug prior to servicing.

Do not damage the mains power cable.

In case of Power on Testing, wear insulating equipments to prevent Electric shock.

Prevent water flowing to electric elements.

Keep hands/Finger away from door hinges to avoid injury.

When Bottom portion of Appliances operated, closed upper section to avoid head injury.

Special-purpose lamps (incandescentlamps, LEDs, fluorescent tubes) in the appliance serve

to illuminate the appliances are not suited for room illumination.

Any repairs or change in the appliance must be carried out by authorised servicepersonnel

only.

3 | P a g e


Contents:

1.0 Operating and control elements................. ..................................................................................6

2.0 Functions at a glance.......................... ..........................................................................................7

3.0 Parts Identification & Specification…………………………… ………………………………………8

4.0 Installation …………………………………………………………………………………….. ..............11

5.0 Assistance to Customers……………………………………………………………… ………………12

6.0 Description of the appliance................... ....................................................................................17

6.1 Sensor positions, schematic diagrams...........................................................................................18

7.0 Main components and their functions............ ...........................................................................19

7.1 Electrical components and functions..............................................................................................19

7.1.1 General.......................................................................................................................................19

7.1.2 Freezer Compartment …………………………………………………………………......................20

7.1.3 Refrigerator Compartment………………………………………………………………....................21

7.2 Refrigeration components and functions......... .........................................................................22

7.2.1 General.......................................................................................................................................22

7.2.2 RefrigeratorCompartment...........................................................................................................22

7.2.3 FreezerCompartment..................................................................................................................22

7.2.4 Principle of operation of the refrigerating system…………………………………………..............23

8.0 Disassembling instructions / replacement of par ts................................................. .................24

8.1 General.......................................................................................................................................24

8.1.1 Control panel electronics.............................................................................................................24

8.1.2 Electronic power module.............................................................................................................25

8.1.3 Top door hinge............................................................................................................................27

8.1.4 Bottom door hinge.......................................................................................................................27

8.1.5 Door Stopper...............................................................................................................................28

8.1.6 Middle Hinge...............................................................................................................................28

8.2 Refrigerator compartment....................... ....................................................................................29

8.2.1 Disassembling the Central Power Cooling Duct Assembly.........................................................29

4 | P a g e


8.2.2 Disassembling the LED & Reflector............................................................................................30

8.2.3 Refrigerator compartment air sensor..........................................................................................31

8.2.4 Re-positioning Glass Shelves.....................................................................................................32

8.2.5 Disassembling Freezer compartment plate & Shroud................................................................33

8.2.6 Evaporator sensor......................................................................................................................34

8.2.7 Fan Motor...................................................................................................................................35

8.2.8 Thermal Fuse.............................................................................................................................36

8.2.9 Disassembling Defrost Heater....................................................................................................36

8.3 Compressor Room Compartment.................... ..........................................................................37

8.3.1 Disassembling Invertor Board (VCC)..........................................................................................37

8.3.2 Disassembling Drain Tray...........................................................................................................38

8.4 Door Accessories............................... .........................................................................................38

8.4.1 Door Racks Adjustment..............................................................................................................38

8.4.2 Door Gasket Removal & Refixed................................................................................................39

9.0 Technical data................................. .............................................................................................40

9.1 General..........................................................................................................................................40

9.1.1 Sensor Resistance……………………………………………………………………….....................40

9.1.2 Freezer Compartment.................................................................................................................41

9.1.3 Refrigerator Compartment..........................................................................................................41

10.0 Service Mode.................................. ............................................................................................42 10.1 Brief survey of Service Mode.......................................................................................................42

11.0 Service Mode Error Beeps, Troubleshooting..... .....................................................................44

11.1 Table of Error Beeps....................................................................................................................44

12.0 Faults, Diagnosis & Repairing method.......... ..........................................................................45

12.1 Compressor not started ……………………………………………………………………………......45

12.2 Cooling Performance Poor……………………………………………………………………………..45

13.0 Troubleshooting............................... ..........................................................................................46

5 | P a g e


13.1 Common Problems & Solutions………………………………………………… …………………..46

13.1.2 Symptom: No Defrosting…………………………………………………………………….............46

13.1.3 Symptom: Not Starting After Power Supply……………………………………………….............46

13.1.4 Symptom: Poor cooling effect accompanied by noise……………………………………............46

13.1.5 Self-Inspection & Solutions…………………………………………………………………………..47

6 | P a g e


1.0 Operating and control elements

Freezer Slider Position Potenti ometer Position

Ambient Temperature : 32 ºC , Condition : Cycling

Potentiometer & Freezer Slider Position

Refrigerator Compartment-Minimum Freezer Compartment-Minimum

Refrigerator Compartment-Medium Freezer Compartment-Medium

Refrigerator Compartment-Maximum Freezer Compartment-Maximum

Freezer (1/2height) -12ºC to -14ºC -15ºC to -20ºC -21ºC to -24ºC

Refrigerator (1/3height)

6+/-3ºC 3+/-3ºC 1+/-2ºC

7 | P a g e


2.0 Functions at a glance

Control Electronic PCB, Potentiometer

Temperature Range

Freezer Compartment : (1/2h)

Refrigerator Compartment (1/3h)

Refrigerator Compartment maximum / Freezer Compartment maximum

-21ºC to -24ºC

1+/-2

(Ambient Temperature 32ºC )

Door Alarm Present Audible

Fan Freezer Compartment

Defrosting Freezer Compartment : Automatic

Interior Light Freezer Compartment : Not Present

Refrigerator Compartment : Present

Service Menu Present Manual

Compressor Standard

Central power Cooling Present

8 | P a g e


3.0 Parts Identification & Specification:

Cluster I – 265Ltrs.

TCb 2620/ TCr 2620/ TCss 2220

1 IceMaker and Drawer

1 Glass Shelf

Fre

ezer

4 Glass Shelves

1 Vegetable Drawer

Re

frig

era

tor

2 Medium Shelves

1 Large Shelf + Separator

2 Egg trays

1 Door Lock Ref

riger

atio

nDoo

r

2 Medium Shelves

Fre

eze

r

Do

or

Medium Shelf Glass Shelf

Ice maker

Lock

Egg Tray

Medium Shelf with separator

Large Shelf with separator

Glass Shelf

Vegetable Drawer

9 | P a g e


Cluster II – 265Ltrs.

TCb 2640/ TCr 2640/ TCss 2640

Glass Shelf

Ice maker

Glass Shelf

Vegetable Drawer

Medium Shelf

Lock

Egg Tray

Medium Shelf with separator

Large Shelf with separator

Cool Pack

Vario Safe

Spice Box

1 IceMaker and Drawer 1 Glass Shelf 1 CoolPack F

reez

er

3 Glass Shelves 1 VarioSafe down 1 Vegetable Drawer 1 Vegetable Sorting System

Ref

riger

ator

2 Medium Shelf 5 SpiceBoxes 1 Large Shelf + Separator 2 Egg trays 1 Door Lock

Ref

riger

atio

nDoo

r

2 Medium Shelves

Fre

ezer

Doo

r

10 | P a g e


Specifications: Model TC2620/2640

Total Gross: 265 Litre

Overall Dimensions: 606X732X1495mm (WXDXH)

Net/Gross weight: 57Kg /67Kg

Outer case: Leather Finished

Insulation: PU Foam

Temperature control: Freezer knob & Potentiometer

Cooling System: No Frost – Forced cooling

Refrigerant : R600a

Operating Voltage/Frequency : 220~240 V /50Hz

Input/Defrost Wattage: 68W/110W

Specifications: Model TC3620/3640

Total Gross: 346 Litre

Overall Dimensions: 606X732X1850mm (WXDXH)

Net/Gross weight: 76Kg /80Kg

Outer case: Leather Finished

Insulation: PU Foam

Temperature control: Freezer knob & Potentiometer

Cooling System: No Cooling - Forced cooling

Refrigerant : R600a

Operating Voltage/Frequency : 220~240 V /50Hz

Input/Defrost Wattage: 65W/110W

11 | P a g e


4.0 Installation:

a. Installation of Refrigerator:

The Installation of Refrigerator is an important process & must be carried out carefully &

Properly in order to achieve trouble free operation of appliance.

Following is the installation procedure for Refrige ration.

Refrigerator should be installed away from any heating appliance such as Gas

Stove or pressure cooker, Micro oven etc.

Avoid installation in open area where direct sun rays or rain would affect the efficiency and

Operation of the Refrigerator.

Ensure that the maximum ventilation is available to the condenser. Avoid installation in

compact area. If customer end space constraints, certain additional precautions are to be

taken such as providing a 200 to 300 mm high stand with a recess at the bottom to improve air

circulation.

b. Power Supply:

Advise to customer for separate socket provision which is to be used for Refrigerator only.

Supply to socket should be taken direct from main power supply source, in order to supply

more consistent supply to the Refrigerator.

Check voltage & Earthing at customer prior Refrigerator Plug in.

c. Transport:

Transport the Refrigerator upright. Read packing box the printed directions for its correct

position.

Don’t dragged the Refrigerator on floor with strips.

d. Packing Removal:

Cut the packing box strips.

Release top side adhesive tapes.

Remove top & side Thermocols.

Remove Packing box & base EPS Tray.

Inspect the Refrigerator physical & sealed system damages.

Remove all packing tapes which are fixed to internal accessories.

12 | P a g e


Refrigerator must be installed with proper ventilated area, space must be maintained as

Top side space 300mm, both side 300mm & back side 120mm (Refer user manual).

Refrigerator must be balance on shop floor proper with the help of Adjustable legs.

This will avoid the compressor making undue noise.

Fixed all accessories in their defined locations.

Keep Thermostat at Maximum position & allow to run appliance empty till 3~4 hours, which

help to stabilize the Temperature in all zones.

While the Refrigerator operating, service engineer must educate the customer for various

necessary requirements as described in user manual.

5.0 Assistance to Customers:

a. Cleaning: Exterior

Exterior must be cleaned with wet clean soft cotton.

Don’t use concentrated Soap or Chemical, which affect aesthetic look of appliances (Dull

exterior appearance).

b. Cleaning: Interior

Add ½ teaspoon Baking soda in Luke warm water & dipped clean cotton which to be used for

Interior surface & Accessories cleaning, don’t use any soap, vim, or any concentrated

Chemical.

c. Food storage:

All Fruits & Vegetables should be put inside polythene bags & kept inside vegetables tray.

Packed food products should be stored in such way that the cold air circulate around.

All liquid, semi liquid containers should be provided with airtight lids or covers.

All the frozen foods, Such as meat, beef, fish etc., and ice creams can be stored in the

Freezer.

d. Temperature Setting/Position:

Inside Temperature of Refrigerator can be controlled with the help of Freezer slider &

Potentiometer setting,

Advice to customers, please read user manual for Potentiometer.

13 | P a g e


e. Defrosting:

As natural phenomenon moisture in the air condensate on the cold surface,

So continuously frost formed inside Freezer compartment.

More frost formation inside Freezer area reducing the cooling effect inside Refrigerator &

hence reduces working efficiency.

The Frost free system automatically defrost the appliance & defrost water goes to the defrost

water tray.

f. Legs Adjustment:

Stand the Refrigerator firmly & level by rotating adjustable legs in clockwise & counter

clockwise direction.

14 | P a g e


g. Glass Shelves Adjustment:

To prevent glass Shelves from being unintentionally:

Lift the shelf slightly & draw it out forwards.

Move the shelf upward or downward depend on requirement.

Move shelf backward until it rest on back side of wall.

h. Bottle Racks Adjustment:

Lift the rack slightly & Pull it out.

Move the rack upward or downward depend on requirement up to provided rest locking

portion.

Move rack inside & slide it downward until it rest on locking portion.

15 | P a g e


i. Ice Making:

Pull outward the Ice tray from Ice maker assembly.

Fill up the ice tray with water up to water level & place it in the ice maker assembly.

Ice making time depends on defined temperature setting.

Hold twister knob & rotate in clockwise direction to dispense ice cubes into the bin.

Pull out bin to use dispensed ice cubes.

j. Door Locking:

For Locking & Unlocking door:

Push the lock key inside the lock.

Rotate it by clockwise direction to unlock & in counter clockwise direction to lock the door

(180deg- MAF).

16 | P a g e


k. Holiday Usage Guideline:

While Holiday plan Refrigerator must shut down.

Disconnect Power supply cord from socket.

Removed Freezer stored food items including Ice trays.

Clean Refrigerator & Dry.

Keep door opened condition, so outside fresh air flow inside the Refrigerator.

l. Restarting After Holiday:

Clean the Refrigerator, as explained above.

Connect Power Supply cord.

Run the Refrigerator empty at least 2~3 hours then load food.

17 | P a g e


6.0 Description of the appliance

The TC3520 &2620 is a Fridge-Freezer combination with a No Frost top Freezer Compartment. Evaporator & Refrigerator sensor used for the refrigeration control of the Freezer & Refrigerator control. Evaporator present in Freezer compartment which allow cooling in the Refrigerator compartment by forced type cooling mode. Therefore the Refrigerator compartment can be operated in conjunction with Forced Cooling through Freezer compartment Fan. Both compartment cooling control through Control knob & Potentiometer knob setting manually. The Freezer compartment cooled using Evaporator coil .The evaporator is thermally sealed off by an insulated EPS & Shroud assembly. A DC Fan motor is employed for even temperature distribution in the Refrigerator compartment. The Fan integrated with Air Return duct path. The Bottom side hot air blows up & passed the evaporator coil.

The Freezer compartment is equipped with an Evaporator coil, Fan module, Evaporator sensor, Defrost Heater & Safety Thermal fuse. The defrosting phases are initiated by way of the electronic control system by considering the compressor running time and door openings into account.

18 | P a g e


6.1 Sensor positions, schematic diagrams:

Fig.6.1/1 Fig.6.1/2

Ref Air Sensor

Freezer Sensor Main PCB

Freezer Temperature Controller

Temperature Controller Knob

-colder air to compartment

-warmer air to Evaporator

Invertor Compressor

Fan Motor

Thermal Fuse

19 | P a g e


7.0 Main components and their functions: 7.1 Electrical components and functions 7.1.1 General

Electronic Control System

Type : Mechanical Temperature Selector.

Components : Potentiometer, Power PCB.

Compressor :

Type : Standard

Function : Compressor ON- OFF depends on Potentiometer position & Refrigerator Air sensor value.

20 | P a g e


7.1.2 Freezer Compartment


Setting Range Freezer Compartment (1/2h) at Maximum Position -21ºC to -24ºC

Display Range No Digital Display.

Mechanical Temperature selector.

Functions

Defrosting

ON Conditions:

1. If at the time of power ON -Evaporator sensor is greater than +2ºc than defrost after 4hours from power is switched ON.

2. If at the time of power ON -Evaporator sensor is less than0ºc and Fridge air sensor temperature less than +8 0ºc then immediate defrost.

3. Total Elapsed time between two defrost minimum 24hours to maximum 72hours depends on number of door open and set temperature.

4. If compressor is running more than 5hours continuous then after 5hours defrost is ON.

OFF Conditions:

1. If Evaporator sensor temp is reached more than +13 0ºc then heater is OFF and then after 10 minutes (drip time) of heater OFF compressor will start.

2. If Evaporator sensor temp is not reached +13 0ºc then defrost will end by time base automatically means after 120minutes.

3. Thermal fuse blow off after 72ºc.

Sensors

Air Sensor Position: At the top of Evaporator coil, inside clip box.

21 | P a g e


7.1.3 Refrigerator Compartment


Setting Range Refrigerator compartment (1/3h) at Maximum 1+/-2ºc.

Display Range

No Digital Display.

Mechanical Temperature selector.

Sensors

Air sensor Position: At the top, inside the central power cooling.

Function: Regulate Refrigerator compartment Temperature w.r.t Pot position

Loads

Fan

Function :

Compressor Door Fan OFF Open OFF ON Closed ON OFF Opened/Closed OFF

During start up the Fan activated only after evaporator sensor reached -3ºC

Door Alarm When: If door is open, after 90 seconds.

Audible: 3beeps, if not closed then repeated again after 3 minutes.

22 | P a g e


7.2 Refrigeration components and functions 7.2.1 General



Comp ressor

Compressor Standard

Control Device Main PCB

Sensor

Refrigerator Air Sensor Position: Inside Central power cooling duct.

Type Negative Temperature coefficient (NTC).

Potentiometer

Potentiometer Variable Resistance.

Door Switch 2 Pole, Piano type.

Evaporator

Air Sensor Position: Clipped on Evaporator coil.

Type Negative Temperature coefficient (NTC).

Defrost Heater

Heater Position: Clipped on Evaporator coil bottom side.

23 | P a g e


7.2.4 Principle of operation of the refrigerating s ystem:

Note: Refrigeration cycle for reference Purpose onl y.*

24 | P a g e


8.0 Disassembly instructions / replacement of parts .

8.1 General

8.1.1 Control panel electronics Potentiometer Assembly: - As described Fig. 8.1.1/1 , - Disengage Potentiometer Assembly at the marked point.

- Disconnect & detach bus connector.

- Unlock Potentiometer PCB by removing marked screws.

Fig.8.1.1/1

25 | P a g e


8.1.2 Electronic power module Note: Pull Out the mains Plug! Electronic power module cover: - Disengage marked Locations screws & Pull Out cover after removing screws. Fig.8.1.2/1

- Disengage marked Locations screws for Earthing Removable .Fig.8.1.2/2

- Disengage the Power supply connector locking & push outward direction for removable. Fig.8.1.2/3

Fig.8.1.2/1 (Fig.8.1.2/2)

Fig.8.1.2/2

Earthing Terminal

Power Supply Connector

26 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 8.1.2 Electronic power module: Electronic Power Module PCB Connector: - As per marked location, Fig.8.1.2/1 - Disengage connectors locking by pushed at back direction & Pull Out connector upward direction. - To remove PCB with cover, disengage lock from mark location. (Fig.8.1.2/2 )

(Fig.8.1.2/1)

(Fig.8.1.2/2)

27 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 8.1.3 Top door hinge Turn Hinge Cover: - Disengage the cover in the marked direction & raise it for removal (Fig.8.1.3/1). Turn Hinge: - Undo the marked screws & remove the turn top hinge (Fig.8.1.3/2).

(Fig.8.1.3/1).

(Fig.8.1.3/2). 8.1.4 Bottom door hinge Turn Bottom Hinge: - Tilt the Refrigerator at back direction. - Undo the marked screws & remove the turn bottom hinge. (Fig.8.1.4/1). - Relocate hinge with flange prior fixed, as per marked location (Fig.8.1.4/2).

(Fig.8.1.4/1). (Fig.8.1.4/2).

28 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 8.1.5 Door Stopper Turn Door Stopper: - Tilt the Refrigerator at back direction. - Undo the marked screws & remove the turn bottom hinge. (Fig.8.1.4/1) - Undo the marked screws & remove the door stopper. (Fig.8.1.5/1)

(Fig.8.1.5/1) 8.1.6 Middle Hinge Turn Middle Hinge: - Disengage the cover in the marked direction& raise it for removal. (Fig.8.1.6/1) - Undo the marked screws & remove the turn top hinge. (Fig.8.1.3/2) - Removed Freezer door from both hinge pin & keep. - Undo the marked screws & remove the turn middle hinge. (Fig.8.1.6/1)

(Fig.8.1.6/1)

29 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 8.2 Refrigerator compartment 8.2.1 Disassembling the Central Power cooling Duct Assembly: Central Power Cooling Duct: - Disengage the Central Power cooling cover Locking at the Marked direction& Pull out it for removal. (Fig.8.2.1/1) - Undo the marked screw & remove the Central power cooling Duct. (Fig.8.2.1/2) - Swing the Central power cooling duct to the left. - Unclip the marked Air sensor connector. (Fig.8.2.1/3)

(Fig.8.2.1/1) (Fig.8.2.1/2) (Fig.8.2.1/3)

30 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 8.2.2 Disassembling the LED & Reflector: LED & Reflector: - As described in Fig.8.2.2/1 , in order to easy removal of LED & Reflector - Disengaged the LED reflector press locking as marked location “1” & shift lock as marked location “2.” (Fig.8.2.2/1)

- After lock disengaged insert small tip objects at marked location “3” & swing downward direction for easy removal. (Fig.8.2.2/1)

(Fig.10.1.2/1)

1

2

3

31 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 8.2.3 Refrigerator compartment air sensor: Air Sensor: - Procedure as described under 8.2.1 disassembling the Central Power cooling Duct Assembly. - Swing the Central power cooling duct to the left. - Unclip the marked Air sensor connector. (Ref above Fig.8.2.3/1) - Unlock the Duct EPS from the marked location & Pull out. (Fig.8.2.3/1) - Remove the marked tapes to unclip the Refrigerator Air sensor. (Fig.8.2.3/2)

(Fig.8.2.3/1) (Fig.8.2 .3/2)

Refrigerator Air Sensor

32 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 8.2.4 Re-positioning Glass Shelves: Glass Shelves: To Prevent Glass shelves from being unintentionally pulled out. (Fig.8.2.4/1) - “A” Position, Lift the shelf slightly & draw it out forwards. - “B” Position, Move the shelf upward or downward depend on requirement. - “C” Position, Move shelf backward until it rest on back side of wall.

(Fig.8.2.4/1)

A B

C

Moon Cut Glass

33 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 8.2.5 Disassembling Freezer compartment plate & Shr oud: Freezer Compartment: - Undo the marked bushes with the help of Flat tip screw driver& remove The Freezer plate. (Fig 8.2.5/1) - Opened the marked screw caps & Undo both screws. (Fig 8.2.5/2) - Hold the marked air window portion with nose plier & Pull out For shroud removal. (Fig 8.2.5/3) - Swing the Freezer shroud to the left side & disengage the marked connector for removal. (Fig 8.2.5/4)

(Fig 8.2.5/1) (Fig 8.2.5/2)

(Fig 8.2.5/3) (Fig 8 .2.5/4)

Fan motor connector

34 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 8.2.6 Evaporator sensor: Evaporator Sensor: - Procedure as described above under Fig.8.2.6/1 Disassembling Freezer compartment Plate & Shroud. - Swing the Freezer shroud to the left side. - Disengage & unlocked the marked connector. (Fig 8.2.6/1) - Unclip the Freezer Air sensor locking from the marked location & remove. (Fig 8.2.6/1)

(Fig 8.2.6/1)

Freezer Sensor

35 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 8.2.7 Disassembling Fan Motor: Fan Motor: - Procedure as described under 8.2.5 Disassembling Freezer compartment Plate & Shroud. - Swing the Freezer shroud to the left side. - Unclip the Fan motor connector & other side bracket as marked. (Fig 8.2.7/1) - Remove four side EPS Duct Paper tapes as marked & pull out upper side EPS duct portion. (Fig 8.2.7/2) - Draw Fan motor outward by holding at marked location. (Fig 8.2.7/3)

(Fig 8.2.7/1) (Fig 8.2.7/2)

(Fig 8.2.7/3)

36 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 8.2.8 Disassembling Thermal Fuse: Thermal Fuse: - Procedure as described under 8.2.5 Disassembling Freezer compartment Plate & Shroud. - Swing the Freezer shroud to the left side. - Disengage the marked connector. (Ref above Fig 8.2.8/1) - Unclip the Thermal fuse from Evaporator coil by releasing twisted wire holding.

(Fig 8.2.8/1) 8.2.9 Disassembling Defrost Heater Defrost Heater: - Procedure as described under 8.2.5 Disassembling Freezer compartment Plate & Shroud. - Swing the Freezer shroud to the left side & Disconnect. - Unlocked the marked connector & unclip from twisted wires & bracket. (Fig 8.2.9/1) - Removed the marked side support EPS Block, Raise &Swing Evaporator coil out Forward direction, ensure no stress on Joints. (Fig.8.2.9/2)

(Fig 8.2.9/1) (Fig 8.2.9/2)

Thermal fuse Connector

Thermal Fuse

Heater Connector

37 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 8.3 Compressor Room Compartment

8.3.1 Disassembling Invertor Board (VCC)

Invertor Board (VCC): - Undo Earthing screw at marked location “A” & opened Earthing

terminal. (Fig 8.3.1/1)

- Undo Invertor board & compressor fixed screw at marked location “B”.

(Fig 8.3.1/1)

- Disengage both connectors locking as marked at location “C” & “D”.

(Fig 8.3.1/1)

- Disengage Invertor board from compressor terminals by detaching

Connectors. (Fig 8.3.1/2)

(Fig 8.3.1/1) (Fig 8.3.1/2) (F ig 8.3.1/3)

A B

C D

Earthing Connector Compressor Connector

Compressor Connector

Earthing Connector

38 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 8.3.2 Disassembling Drain Tray

Drain Tray: - Undo both marked screws. (Fig.8.3.2/1)

- Swing the Auxiliary condenser pipe upward direction &raise above for easy

Removal of drain tray. (Fig.8.3.2/2)

(Fig.8.3.2/1) (Fig.8.3.2/2)

8.4 Door Accessories

8.4.1 Door Racks Adjustment

Door Racks: - To Adjust door rack

- At marked location “1”, Lift the rack slightly & Pull it out. (Fig.8.4.1/1)

- At marked location “2”, move the rack upward or downward depend

On requirement up to provided rest locking portion – “A” & “B”. (Fig.8.4.1/1)

- At marked location “3”, move rack inside & slide it downward until it rest on locking.

(Fig.8.4.1/1)

1

2

3

39 | P a g e


8.4.2 Door Gasket Removal & Refixed

Door Gasket: - Disengage the Door Gasket at 4 corners as marked locations & Pull outward for

Removal. (Fig.8.4.2/1)

- For refixed the door Gasket press it at 4 corners then press throughout

Length inside door Liner groove.

(Fig.8.4.2/1)

40 | P a g e


9.0 Technical data

9.1 General

9.1.1 Sensors Value: Refrigerator Compartment: Air Sensor.

Freezer Compartment: Evaporator sensor.

Table.13.1/1

Temperature oC Resistance value kOhm

-20oC 45.54

-15oC 34.20

-10oC 25.93

-5oC 19.83

0oC 15.30

5oC 11.89

10oC 9.32

15oC 1.35

20oC 5.85

25oC 4.68

30oC 3.77

40oC 2.49

50oC 1.68

41 | P a g e




Fan : Wattage: 2 Watts

Voltage: 12 Volts DC

Current: 0.2 Amps

Defrost Heater : Wattage: 110 Watts

Voltage: 230 Volts AC

Current: 0.5 Volts DC

Temperature Fuse: Tripping Temperature 72°C. ( Contact opened after tripping & has

to be replaced)

Interior Light : Wattage: 2 Watts

Voltage: 12 Volts DC

Current: 0.2 Amps

42 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 10.0 Service Mode

10.1 Brief survey of Test Mode

Activation of Test mode: - Disconnect Appliances from main power supply & wait for 3minutes.

- Reconnect the appliance, Turn Refrigerator compartment

Potentiometer to “Maximum” position, kept door open condition

& switch ON the appliances, 3beeps heard then close door within 30 sec.

Follow below table steps.

Step Requirement / Procedure to be done by PCB

Acknowledgement / Response

Comments Timer

Seconds (Parameter)

Entry condition

Only at the time of Power ON -Refrigerator Door open & Refrigerator Potentiometer Maximum

3 beeps

To avoid by chance entry & Ensure Door switch working

30

Confirmation

After response Refrigerator Door close within 30 sec 3 beeps

If door not closed, exit Service mode & run normal program

After Response you can open Refrigerator door

Check Voltage.

If voltage is below border5 1 beep repeat with 1 sec gap

Below 160Volts Within 220to 240Volts Above 260volts

5 If voltage is within border5 2 beeps repeat with 1 sec gap

If voltage is above border5 3 beeps repeat with 1 sec gap

Check Sensors

Check Ambient sensor & respond in case faulty - Short / Open

1 beep 1 beep – Ambient

10/20

Check Refrigerator Air sensor & respond in case faulty - Short / Open

2 beeps 2 beeps - Refrigerator Air

Check Freezer Evaporator sensor & respond in case faulty - Short / Open

3 beeps 3 beeps – Evaporator

If no fault, after 20 seconds Response & move to next check

43 | P a g e


Step Requirement / Procedure to be done by PCB

Acknowledgement / Response Comments

Timer Seconds

(Parameter)

Check LED Blink LED @1sec

Check visually blinking

After 10 sec Response & move to next check

10

Check Fan - Freezer

Give supply to Freezer Fan & beep

5 beeps Visually check Frz fan faulty

30

Check Heater Switch ON heater & beep 1 beep

Place Tong tester & measure current

60

Check Comp

Switch ON compressor for High speed & beep

1 beep Place Tong tester & measure current

60

Switch ON compressor for Low speed & beep

1 beep Place Tong tester & measure current

60

Exit Switch OFF compressor & exit Service mode & run normal prog.

20 beeps Set potentiometer for Normal use

10

44 | P a g e


11.0 Service Mode Error Beeps, Troubleshooting

11.1 Table of Error Beep

Note: Priority 1 is highest.

Priority Alarm Beeps

1 Door Alarm > 90 Sec 3

2

Sensor Failure Alarm,

( Freezer Evaporator, Refrigerator Air,

PCB Ambient )

4

4 Low Voltage Alarm < 160V 1

45 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 12.0 Faults, Diagnosis & Repairing method: 12.1. Compressor not started: - As per marked locat ion, as shown in Fig.12.1/1, Check the resistance - If resistance value (Ω) between all terminals are same, then Compressor is OK, so need to check other parts. - If resistance value between terminals differ from any one of them, Then compressor is defective & need to replace.

Note : Terminal resistance( Ω) = 8.7±7% (at 25). Fig.12.1/1 12.2 Cooling Performance Poor:

Fan motor doesn’t

run

Check Current flowing

in door switch

Check Current flowing in

the Fan motor

Poor Contact

Coil short

Parts defective or Short More Ice formed on

Evaporator

Check voltage following at

1.Evaporator sensor

2.Thermal Fuse

1.Check Heater resistance

2.Check voltage at Heater

connector

Replaced defective

Parts

Replace each

Component

Replace each

Component

Remarks: Test modes & error codes need to refer for details Faults, Diagnosis & Repairing as mentioned in above page no - 43to45.

46 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 13.0 Troubleshooting: 13.1 Common Problems & Solutions 13.1.1 Symptom: No Defrosting Check: 1. Check Service mode 2. Disengage the Freezer base plate & Freezer shroud to check all connectors properly fixed, If found OK then check output voltage 220~240V at heater connector.

3. Measure the continuity of Thermal fuse, if no continuity observed then replaced Thermal fuse.

4. Measure the resistance of the heater with the help of Multimeter. It should around 430 to 490Ω.

5. If no malfunction is found in the above checks, then test the Evaporator sensor resistance

with the help of Multimeter.

13.1.2 Symptom: Not Starting After Power Supply. Check: 1. Check the power supply connected properly. 2. Remove the main PCB cover & check connector wiring soldering open or skips. Solution: 1. If there is dry soldering or open soldering on the main PCB, resolder it with soldering gun. 2. If any connector is not connected properly then re plug it firmly. 13.1.3 Symptom: Poor cooling effect accompanied by noise. Check: 1. Check if there is abnormal noise from Freezer compartment. Disengage the Fan cover & refixed properly in order to eliminate improper fitment. 2. If Fan does not run, remove it & check if its connector are connected properly. Test if there is approximately 12VDC Voltage at connector, if not observed then Fan motor or main PCB defective. Solution: 1. Ensure Fan motor properly fix & wiring routed at its location, if problem persist then opened Fan & reinstall again 2. If main PCB or Fan motor malfunctioning then replace with prior check.

47 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 13.1.4 Self-Inspection & Solutions for frequent Cus tomers usage feedbacks

Self -Inspection & Solutions for frequent Customers usage feedbacks Customer feedbacks Root Causes Solutions Water/Moisture/Frost formation inside surface of t he Refrigerator

Moisture formation on the Refrigerators inner walls.

1. Hot & Humidity climate. 2. Door opened & closed frequently for long time. 3. Door Gasket sealing improper.

1. Accumulation of frost & water droplets accelerate in Hot & Humidity condition (Normal phenomenon). 2. Ensure proper closing by leveling refrigeration & avoid food stuffed container touch to door. 3. Don’t open door frequently for long time.

Water/Moisture/Frost formation outside surface of the Refrigerator

Water droplets or moisture formed outer surface or in between doors.

1. Hot & Humidity climate. 2. Refrigerator door gasket not sealed Properly, leakage cold air mixed with hot air & formed water droplets.

1. Natural phenomenon, water droplets &moisture disappeared as climate condition changed. 2. Ensure proper closing by leveling refrigeration & avoid food stuffed container touch to door.

Bad Smell in the Refrigerator

Bad smell coming while door opened

1.Refrigerator not clean so long time 2.Stuffed foods fall down inside Refrigerator

1.Clean the inside wall, Gasket & all plastic accessories in regular period of usage 2.Follow user manual for detail process

Abnormal Noise from Refrigerator

Beeps 1.Refrigerator compartment door is open 2.System part failure

1.Close the door 2.Run Refrigerator in Test mode - as described above & fix problem by replacing new parts

Vibration

1.The Refrigerator is not properly balance on floor 2.Accessories are not properly fix at original position 3.External objects touches to the Refrigerator

1.Adjust levelling legs for proper balancing 2.Fix accessories properly at its original position 3.Remove objects around Refrigerator

Flowing water Sound System gas circulation noise Normal - ignored

Side wall getting warm Internal condenser heat reject Normal - Provided to avoid water droplets formation on cabinet side wall

48 | P a g e

Service Manual No. 01/2018 TC2620/TC3520 from- 20 Refrigerator Working

Compressor dead or not work

1.In proper power supply 2.Refrigerator is in Defrosting cycle

1. Ensure power supply socket firmly

fixed 2.Normal - as automatic defrost in No frost refrigerator.

Freezer compartment does not work

1.Fan motor does not work due to it having loose contact or defective 2.Refrigerator door not closed properly , as Fan activated through Door switch

1. Check the Fan motor or replace defective Fan motor. 2. Closed Refrigerator door properly.

Refrigerator compartment working intermittent or runs for long period

1. Refrigerator installed place or ambient temperature high. 2. Doors opens frequently for long period. 3. Freezer slider knob setting wrong. 4. Doors gasket sealing improper, roll or magnetic property loose.

1. Normal - as inside Temperature not

achieved, so compressor run for longer period.

2. System balancing time approx. 8to 10 hrs. For proper cooling achieved.

3. Ensure Freezer slider setting as per instructions guide fix on Freezer door.

4. Turned Refrigerator Potentiometer at maximum setting to accelerate cooling effect.

5. Clean & replaced damaged gasket 6. Avoid door closing obstacles by

placing utensil properly.

TC 3520* from Index 20assi.lhg.liebherr.com/Serviceline/b2b/bab2b/Media/... · 2018. 7. 18. ·...

Documents

Transcript of TC 3520* from Index 20assi.lhg.liebherr.com/Serviceline/b2b/bab2b/Media/... · 2018. 7. 18. ·...