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REFRIGERATOR

MODEL:HS-455LWEN(D)-W1

Instruction Manual

Important Safety Notice

The Maintenance Manual is only for the use of maintenance personnel with certain experience and

background in electrical, electronic and mechanical field.

Any attempt to repair main devices may lead to personal injury and property loss.

Manufacturers or distributors are not responsible for the content of the Manual and interpretation

thereof.

Midea Refrigerators

Technical Maintenance Manual

Copyright @2016

All rights reserved. Replication of all or part of the Manual in any forms shall not be allowed without

written approval by the Overseas Sales Corporation of Midea Refrigerators.

Contents

1.SAFETY WARNING CODE ......................................................................................................... 1

1.1WARNING FOR OPERATION SAFETY ................................................................................................... 1

1.2SAFETY INSTRUCTION FOR REFRIGERANT ......................................................................................... 4

2.DESCRIPTION FOR PRODUCT FEATURES ............................................................................ 5

3.INSTALLATION AND COMMISSIONING ................................................................................ 6

3.1HANDLING ....................................................................................................................................... 6

3.2DISASSEMBLY (NONE) ...................................................................................................................... 6

3.3 INSTALLATION LOCATION ................................................................................................................ 6

3.4 LEVELING OF THE REFRIGERATOR .................................................................................................... 7

3.5CHANGE THE DOOR OPENING DIRECTION .......................................................................................... 7

3.6 INSTALLATION OF HANDLE .............................................................................................................. 9

3.7 INSTALLATION OF DOOR LOCK（NONE） ...................................................................................... 10

3.8 ADJUSTMENT TO LEVEL THE DOOR（NONE） ............................................................................... 10

3.9 ADJUSTMENT TO SHELVES（NONE） ............................................................................................ 10

4.TERMS ........................................................................................................................................ 10

4.1 DEFINITION OF MODEL(NONE) ...................................................................................................... 10

4.2LOCATION OF NAMEPLATE .............................................................................................................. 10

5.PRODUCT SPECIFICATION .................................................................................................... 11

5.1 TYPESPECIFICATION(NONE) ........................................................................................................... 11

5.2 ELECTRICAL PARAMETERS ............................................................................................................. 11

5.3REFRIGERATING TEMPERATURE ...................................................................................................... 11

5.4DEFROSTING PARTS ........................................................................................................................ 11

5.5CIRCUIT DIAGRAM.......................................................................................................................... 12

6.INTERNAL VIEW AND DIMENSION ...................................................................................... 13

6.1MAIN PARTS AND THEIR NAMES ...................................................................................................... 13

6.2EXTERNAL DIMENSION ................................................................................................................... 13

7.REFRIGERATING PIPING SYSTEM AND CIRCULATING ROUTE OF COOLING AIR .. 15

7.2CIRCULATING ROUTE OF COOLING AIR ............................................................................................ 16

8. DISMANTLING OF PARTS ...................................................................................................... 17

8.1 PARTS ON THE DOOR ...................................................................................................................... 17

8.2PARTS INSIDE THE REFRIGERATOR .................................................................................................. 17

8.3LIGHT SYSTEM ............................................................................................................................... 18

8.4AIR DUCT AND FAN MOTOR ............................................................................................................. 19

8.5EVAPORATOR AND TEMPERATURE SENSING SYSTEM ....................................................................... 19

8.6COMPRESSOR CASE ........................................................................................................................ 20

8.7DISPLAY AND MAIN CONTROL PANEL .............................................................................................. 21

8.8 BAR COUNTER(NONE) ................................................................................................................... 22

8.9 WATER DISPENSER ......................................................................................................................... 22

8.10 ICE MAKER(NONE) ...................................................................................................................... 23

9. FUNCTION AND OPERATION9.1 OPERATION PANEL ........................................................................... 24

9.2 BUTTON......................................................................................................................................... 24

9.3 DISPLAY SCREEN ........................................................................................................................... 24

9.4 DISPLAY ........................................................................................................................................ 24

IF NO FAILURE OCCURS, THE CURRENT OPERATION GEAR WILL BE DISPLAYED.9.5 档位设定 SETTING

OF THE GEAR ....................................................................................................................................... 24

9.6 SUPER COOL .................................................................................................................................. 25

9.7 FAULT CODE AND SOLUTIONS ........................................................................................................ 25

9.8DEFROSTING FUNCTION ................................................................................................................. 25

9.9TEST MODE..................................................................................................................................... 26

9.10SELF-DIAGNOSIS .......................................................................................................................... 27

10.CIRCUIT DESCRIPTION10.1 POWER SUPPLY .................................................................................... 27

10.2DOOR TRIP TEST CIRCUIT .............................................................................................................. 28

10.3TEMPERATURE TEST CIRCUIT ........................................................................................................ 28

10.4FAN MOTOR CIRCUIT OF THE FREEZING CHAMBER ........................................................................ 29

10.5REFRIGERATOR FAN MOTOR CIRCUIT (NONE) ............................................................................... 29

10.6CONDENSING FAN MOTOR CIRCUIT (NONE) .................................................................................. 29

10.7DAMPER MOTOR CIRCUIT (NONE) ................................................................................................ 29

10.8RESISTANCE VALUE OF THE SENSOR (R/T) .................................................................................... 29

11.TROUBLESHOOTING METHOD........................................................................................... 31

11.1 NO REFRIGERATION ..................................................................................................................... 31

11.2 COMPRESSOR FAILURE................................................................................................................. 32

11.3 UNDERCOOLING(ELECTRONIC TEMPERATURE-CONTROL)............................................................ 32

11.4 FAN FAILURE ................................................................................................................................ 33

11.5NOISE ........................................................................................................................................... 33

11.6 LIGHTS INSIDE THE REFRIGERATOR DON’T LIGHT UP .................................................................... 34

12. FIGURES AND DETAILS OF REPAIR PARTS(DOCUMENTS ARE PROVIDED

SEPARATELY) ............................................................................................................................... 35

12.1 FIGURE ........................................................................................................................................ 35

12.2 LIST OF PARTS AND COMPONENTS ................................................................................................ 35

13APPENDIX: ...................................................................................................................................... 35

13.1ELECTRICAL SCHEMATIC DIAGRAM ............................................................................................. 35

13.2REFRIGERATOR MAINTENANCE TOOLING AND EQUIPMENT AND MATERIAL .................................. 35

1

1.Safety Warning Code

1.1Warning for operation safety

4

1.2Safety instruction for refrigerant

5

2.Description for product features

This product is provided with following features:

(The picture is only for reference, and specific appearance and configuration are subject to the real

product)

1) Full air-cooling and frost-free design

2) Display control board is located on the door

3) Magnetically control switch

4) Electronic temperature control system with more accurate temperature control.

6

3.Installation and commissioning

3.1Handling

1) Protecttherefrigeratorinmovingit

Sameasshownasleftphoto,pleasemoveitbyhandcartwi

thcushion

2) Removeallpackingmaterialsandbottomcushion,then

moveintohouseforplacement

3) Aftermovingittoappropriatelocation,waitfor2hoursbe

forepoweron.

3.2Disassembly (None)

The refrigerator door needs to be dismantled if it cannot enter the room in the whole.

3.3 Installation location

Location that is easy for ventilation shall be

chosen to facilitate heat dissipation, enhance

its performance and reduce the energy

consumption.

7

3.4 Leveling of the refrigerator

If the refrigerator cannot be placed steadily,

adjust the footing to level it.

3.5Change the door opening direction

1、Remove the hinge cover and plates from the

top of refrigerator

2、Pull out the fast connector of door signal

wire, remove the upper hinge screw, then

remove the upper hinge

3、Pull out the door ,remove the bottom hinge

8

4、Reversal the bottom hinge, Unscrew the

hinge pin from the bottom hinge and move it to

the other side(a), then secure the bottom hinge to

the bottom left side of the refrigerator

5、Remove the door block from the bottom, right

side of the door and attach it to the other side.

6、Install the door and the signal to other side,

connect the terminal and install upper hinge(a),

lid the upper hinge cover and the door end cap

9

3.6 Installation of handle

Note: Figures in the user manual are only for reference. The actual product may differ slightly.

The refrigerator must be disconnected from the source of electrical supply before attempting the

installation of accessory.

Schematic diagram of handle installation Design sketch of installed handle

1） Remove the insert pin ①

①

2)Adjust the handle ③ to the installing hole

and tighten screw ②.

②③

3)Cover the nut cap ④ of handle hole

④

(Pictures and objects are not consistent, in order to prevail in kind)

10

3.7 Installation of door lock（None）

3.8 Adjustment to level the door（None）

3.9 Adjustment to shelves（None）

4.Terms

4.1 Definition of model(None)

4.2Location of nameplate


product)

Lable

11

5.Product specification

5.1 typespecification(None)

5.2 Electrical parameters

Product Name CE-BC350WE-ST

Product Code 22031010001501

Name Item Type Specification

Compresso

r

Compressor / D53CY1

Starter PTC QP2-15

Overload protector OLP 3TM129NF1/TB35-120

Winding resistance of

compressor wiring terminal

44.8Ω±7%

26.7Ω±7%

Variable frequency driver

board / /

Motor

Fan motor of the refrigerating

chamber DC12V/≤3W

Ventilation door of the

refrigerating chamber / /

Condensation fan / /

Lights

inside the

refrigerato

r

Lights inside the freezing

chamber / /

Lights inside the refrigerating

chamber LED

DC12V

Switch of the refrigerator door / DC12V

5.3Refrigerating temperature

Temperature tolerance ≤ 2°C

Compartment The highest (oC) Lowest (

oC)

Freezing / /

Refrigerating 9 1

Variable temperature / /

5.4Defrosting parts

Defrosting period Initial defrosting period Normal defrosting period

Temperature is lower than 0 oC 6~24 hours

Defrosting sensor / /

Thermal fuse / /

12

Defrosting heater in freezing chamber / /

5.5Circuit diagram

13

6.Internal view and dimension

6.1Main parts and their names


product)

1.Magnetically controlled switch

2.Air duct components in refrigerating

chamber

3.Glass shelve

4.Air duct components in refrigerating

chamber

5.Cover plate of crisper

6.Crisper for fruit and vegetable

7.Regulating foot

8.Big bottle frame in refrigerating chamber

9. Small bottle frame in freezing chamber

10. Water tank assembly

6.2External dimension

Front view Side view

14

Down view Open Door

Maximum open angle of door（135°）


15

product)

7.Refrigerating piping system and circulating route of cooling air

Compressor →Condenser →Anti-condensation tube →Dry filter → Capillary tube

→ Evaporator → Regenerator → Suction tube → Compressor

(The picture is only for reference, and specific appearance and configuration are subject to the

real product)

16

7.2Circulating route of cooling air


product)

17

8. Dismantling of parts

8.1 Parts on the door

Door seal

Door seal is installed into door liner groove.

1) Open the refrigerator door.

2) Take the door seal out of door liner.

Door tray

Lift up the bottle frame and take it out from the door

liner of the refrigerator.

8.2Parts inside the refrigerator

Refrigerator Fruit box cover

Removethecrispercoverofref.compartementaccordingto

belowsteps:

1） takeoutthecrisperfirstly;

2） Pulloutthecrispercovercompletely

Shelves

18

1） Pull out the partition plate completely.

2） Lift it up and take it out from the refrigerator.

Ice tray None

Refrigerator tray None

Drawer None

8.3Light system

Light

Light of the refrigerating chamber is located at the

upper air duct component

1） Pull out the upper air duct component of the

refrigerator chamber

2） Remove the control panel of light

Light switch

The magnetically control switch is located on upper

beam of refrigerator

1）Open the cover of upper beam by tools, remove the

magnetically control switch

19

8.4Air duct and fan motor

Air duct components in freezer chamber

All accessories in the freezer chamber should be

dismantled before removing the air duct components.

1） Remove 2 screws on the cover plate of the

refrigerator air duct using a cross screwdriver;

2） Pull out the connector terminal of the fan motor;

3） pull out the cap of the refrigerator upper air duct,

and then remove the 2 screw of the refrigerator

upper air duct components

4） Pull out the connector

Fan motor

1） Tear off the kraft paper tape

2） Remove the fan motor from the air duct component

3） Replace

the fan motor, the reverse operation for assembly

Damper assembly None

8.5Evaporator and temperature sensing system

Evaporator in freezing chamber

20

1） Remove the air duct components in freezer chamber.

2） Disconnect all connectors.

3） Remove the welding on inlet and outlet tubes.

Ambient temperature sensor

Before remove the sensor, the freezer duct assembly

should be removed

1） Remove the air duct assembly from the freezer.

2） Remove the sensor.

Ambient temperature sensor None

Freezer sensor None

8.6Compressor case

Rear cover and compressor case None

Condenser fan moto None

No rear cover None

Terminal box of the compressor None

Standby condenser None

Piping system in the compressor case

1.Compressor 5.Dry filter

21

2.Exhaust transition pipe

3.Condenser

4.Anti-condensationg tube

6.Capillary

7.Suction pipe

8.Return transition pipe

Starter and protector of the compressor

1. Remove the screws

1） Two screws outside

2） One screw inside

2. Remove the clipping strip

Slowly pull it out

3. Remove the protective cover

1）Pry the protective cover slowly from the upper part,

2）Pull it out and remove it.

4. Remove the starter and protector

Unplug the starter and protector (you can use a

screwdriver to pry it slowly)

5. The reverse process can complete installation. /

8.7Display and main control panel

Display control board

22

1) Use vacuum cap to pull the control panel

outwards

2) Disconnect the connector of display control

board, remove it

Main control board

Main control board is located in the top of the

refrigerator

1) Remove the main control board screw with a

Phillips screwdriver

2) Disconnect the connector of main control

board, remove it

8.8 Bar counter(None)

Disassembly and installation of bar counter None

Disassembly and installation bar doorseal None

8.9 Water dispenser

Disassembly and installation of water tank

23

Disassembly and installation of water valve

Disassembly and installation of getting water cap

component

8.10 Ice maker(None)

Disassembly and installation of ice maker None

Disassembly and installation of water system None

Disassembly and installation ice machine sensor None

24

9. Function and operation

9.1 Operation panel

See figure below for buttons and display arrangement of human-machine interface:

Gear 5

Gear 4

Gear 3

Gear 2

Gear 1

Super cool

Gear set button

9.2 Button

SET：Gear set button

9.3 Display screen

1 Super cool 2 Gear 1——2℃

3 Gear 2——3℃ 4 Gear 3——4℃ 5 Gear 4——6℃

6 Gear 5——8℃

9.4 Display

At the first time of power-on, the display screen (including button light) will be bright for 3 seconds and then press the middle gear to show operation

Normal operation display When failure occurs, the corresponding LED light group will display fault code (circular

display);

If no failure occurs, the current operation gear will be displayed.

9.5 Setting of the gear

Press the gear setting button “SET” once, the gear will be changed once; 15 seconds after setting

the gear, the refrigerator will be running in accordance with the set value.The gear can be set to:

(The set temperature will be reduced by 1°C and it can be set circularly)

4 gear 5gear 3 gear 2 gear 1 gear Super cool

26

2.If power failure occurs abruptly to the Compressor and the defrosting sensor in freezing chamber

is less than 0 o

C after powering on, then first conduct defrosting once. If more than 0 o

C, then

defrosting is not needed.

After that, conduct defrosting according to using condition and ambient temperature in a period

between 6 and 24 hours as per the accumulative operation time of the Compressor.

9.9Test mode

Test

module

Test

items Testing Method Expected result

Test

Mode

Enter Test

Mode

Keep pressing the SET button

for 5 seconds and release

LED indicators on quick cool and Gear 1, 2, 3, 4

light up and flicker in the frequency of 0.5s, then

the refrigerator enters into test mode

After entering into test mode,

if no button is pressed within

15 seconds

then the refrigerator will exit the test mode and

return to normal operation mode

Select to

enter into

forced

cooling

mode

Enter into test mode and press

button for the first time

LED indicators on Gear 1, 2 and quick cool light

up and other LED indicators light off, then the

compressor and the fan will start working

In forced cooling mode, if no

button is pressed within 36

hours,



Select to

enter into

forced

defrosting

mode


button for the second time

LED indicators on Gear 2, 3 and 4 light up and

other LED indicators light on, then the

compressor and the fan will stop working, The

heater open, refrigerator into forced frost

In forced defrosting mode,

when the defrosting sensor

reach a temperature of 8°C and

the defrosting heater has been

working for 3 minutes,



In forced defrosting mode, if

the temperature of defrosting

sensor is always lower than

8°C and the compressor has

been stop working more than 5

hour.



Select to

exit the

test mode


button for the third time



27

9.10Self-diagnosis

Conditions for entering into this mode

When the power is on for the first time, here is no sensor failure and the defrost sensor

temperature is equal to or more than 0°C.

Self-diagnosis process

1. Defrost heater is on for 2 seconds and off for 2 seconds;

2.The fan is on for 10 seconds and off for 2 seconds;

3.The refrigerator is refrigerating for 20 minutes. (The compressor fans are all on)

Exit out of self-diagnosis

1、

1.Stop self-diagnosing and turn into normal mode;

2.Failure occurs to the sensor during self-diagnosis and exit out of self-diagnosis mode;

3.Set forced defrosting function during self-diagnosis.

10.Circuit description10.1 Power Supply

The AC input power is reduced in voltage by SMPS control chip and filtered off wave by the

inductance-capacitance filter, then output the DC 12V power which will mainly power the relay

that controls strong current. Relay is used to control the strong current loaded switches of

compressor, ice maker and defrost heater. The DC 12V power will output stable 5V electricity

after passing through the adjustor 7805, to power for the main control chip and thus monitor the

temperature changes in refrigerator.

28

10.2Door trip test circuit

The door switch input circuit is used to detect the refrigerator door open or not the circuit module.

Chip I/O PORT port. by testing the continuous high level + 5V to determine whether the door is

open. And then drive the relevant load

10.3Temperature test circuit

It’s conducted by the sensor, making use of the characteristics that resistance value reduces as the

temperature increases, and the thermistor that has temperature coefficient of resistance in medium

temperature.

The characteristic that resistance value reduces as the temperature increases is deemed to have

negative slope or negative temperature coefficient (NTC), and such thermistor is called as NTC

thermistor. The resistance value changes sensitively with temperature and typically changes 7% ~

29

3% per degree centigrade. Sensor used in the refrigerator is NTC thermistor.

There is following computing formula for the sensor:

Sampling voltage / reference voltage = R1 / (RNTC + R1)

AD value / reference AD value = R1 / (RNTC + R1)

The reference voltage is 5V, RNTC is the resistance value of the sensor, R1 is R31\R32\R33 in

schematic diagram that is 5.1K

10.4Fan motor circuit of the freezing chamber

The fan in the freezing chamber is running when the compressor is operating. Check 12V and

FAN to see if there is a voltage of 12V. When in normal operation, the fan is in low level and the

voltage between 12V and FAN is more than 11V. If there’s no voltage when the compressor is in

operation, fan motor or electric control panel can be replaced.

10.5Refrigerator fan motor circuit (None)

10.6Condensing fan motor circuit (None)

10.7Damper motor circuit (None)

10.8Resistance value of the sensor (R/T)

Tx(℃) R（KΩ） Tx(℃) R（KΩ） Tx(℃) R（KΩ） Tx(℃) R（KΩ） Tx(℃) R（KΩ）

-30 33.81 -15 14.31 0 6.495 15 3.141 30 1.617

-29 31.85 -14 13.55 1 6.175 16 2.999 31 1.55

-28 30.01 -13 12.83 2 5.873 17 2.865 32 1.486

-27 28.29 -12 12.16 3 5.587 18 2.737 33 1.426

-26 26.68 -11 11.52 4 5.315 19 2.616 34 1.368

30

-25 25.17 -10 10.92 5 5.06 20 2.501 35 1.312

-24 23.76 -9 10.35 6 4.818 21 2.391 36 1.259

-23 22.43 -8 9.82 7 4.589 22 2.287 37 1.209

-22 21.18 -7 9.316 8 4.372 23 2.188 38 1.161

-21 20.01 -6 8.841 9 4.167 24 2.094 39 1.115

-20 18.9 -5 8.392 10 3.972 25 2.005 40 1.071

-19 17.87 -4 7.968 11 3.788 26 1.919 41 1.029

-18 16.9 -3 7.568 12 3.613 27 1.838 42 0.9885

-17 15.98 -2 7.19 13 3.447 28 1.761 43 0.9506

-16 15.12 -1 6.833 14 3.29 29 1.687 44 0.914

31

11.Troubleshooting Method

11.1 No refrigeration

32

11.2 Compressor failure

11.3 Undercooling(Electronic temperature-control)

33

11.4 Fan failure

11.5Noise

34

11.6 Lights inside the refrigerator don’t light up

35

12. Figures and details of repair parts(Documents are provided

separately)

12.1 Figure

12.2 List of parts and components

13Appendix:

13.1Electrical Schematic Diagram

13.2refrigerator maintenance tooling and equipment and material

Tooling

No. Name Photo Main Usage

36

1 Phillips screwdriver

screw assemble and disassemble

2 slotted screwdriver/scraper

screw and rivet assemble and

disassemble

3 Socket spanner 5/16″

hinge and compressor screw

assemble and disassemble

4 Sucker

display panel and air duct

cover disassemble

5 Allen wrench（2.8~4mm）

handle assemble and

disassemble

6 Vise grip pliers

sealing process tube

7 Pipe cutter

pipe cutting

37

8 Knife

assistive tool

9 Nipper pliers

assistive tool

10 Capillary tube scissors

Shear capillary

Equipment


1 Vacuum pump

vacuum pumping

2 Electronic scale

weighing refrigerant/gas

3 High pressure nitrogen with

piezometer

pipe and cooling

system(condenser, evaporator,

etc) impurities clean

38

4 Soldering gun

heating and welding

5 Quick coupling

connection process

pipeline,vacuumorchargerefriger

antwillbeused.

6 hand leak detector

welding point leakage detect, if

no, use soap-suds

material


1 Process pipeline

Chargetherefrigerant

2 Dry filter

Involving a system failure to be

replaced

3 Copper welding rod

tube welding

4 Refrigerant/gas

Add refrigerant to the system

39

5 Sealing tape

door fixing for reversible door option