Midea SBS Series User manual

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Service Manual SBSSERIES
Applicable Models
Model Code
Applicable Models
HC-957WEN
UR-BCD746WE-DT
22031050000741
The picture in this service manual is only for reference, and specific appearance
and configuration are subject to the real product.
This manual mainly teaches the method, the specific work skill needs engineer to
accumulate through the daily work.

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WARNING
Important Safety Notice
There are special components used in this equipment which are important for safety. These parts are marked
by in the Schematic Diagrams, Circuit Board Diagrams, Exploded Views and Replacement Parts List. It is
essential that these critical parts should be replaced with manufacturer’s specified parts to prevent shock, fire
or other hazards. Do not modify the original design without permission of manufacturer.
WARNING
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 @2017
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.

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Contents
1. SIGNIFICANT UPDATE NOTES(NONE) .....................................................................................................5
2. SAFETY WARNING CODE..............................................................................................................................6
2.1WARNING FOR OPERATION SAFETY................................................................................................................ 6
2.2 SAFETY INSTRUCTION FOR REFRIGERANT ...................................................................................................... 8
3. TRANSPORT ...................................................................................................................................................9
3.1HANDLING..................................................................................................................................................... 9
4. INSTALLATION AND COMMISSIONING..................................................................................................... 10
4.1DOOR DISASSEMBLY ANDASSEMBLY............................................................................................................ 10
4.2INSTALLATION LOCATION .............................................................................................................................. 13
4.3LEVELING OF THE REFRIGERATOR................................................................................................................. 13
4.4LEFT OR RIGHT OPEN DOOR REVERSAL(NONE).............................................................................................. 14
4.5INSTALLATION OF HANDLE(NONE)................................................................................................................. 14
4.6INSTALLATION OF DOOR LOCK（NONE）....................................................................................................... 14
4.7ADJUSTMENT TO LEVEL THE DOOR................................................................................................................ 14
5. PRODUCT CONFIGURATION AND DIMENSION ....................................................................................... 16
5.1 MAIN PARTS AND THEIR NAMES.................................................................................................................... 16
5.2 EXTERNAL DIMENSION ................................................................................................................................ 17
5.3LOCATION OF S/N ....................................................................................................................................... 18
6. PRODUCT SPECIFICATION ........................................................................................................................ 19
6.1ELECTRICAL PARAMETERS ........................................................................................................................... 19
6.2COOLING TEMPERATURE SETTING RANGE ..................................................................................................... 20
6.3DEFROSTING PARTS .................................................................................................................................... 20
6.4CIRCUIT DIAGRAM........................................................................................................................................ 20
6.5MAIN CONTROL BOARD STRUCTURE DIAGRAM ............................................................................................... 20
6.5.1 ICE MAKER CONTROL BOARD STRUCTURE DIAGRAM................................................................................... 21
6.6ELECTRIC EXCHANGE VALVE (NONE)........................................................................................................... 21
6.7WATER VALVE.............................................................................................................................................. 22
7.REFRIGERATING PIPING SYSTEM AND CIRCULATING ROUTE OF COOLING AIR.............................. 23
7.1 REFRIGERATING PIPING SYSTEM.................................................................................................................. 23
7.2SPECIAL SOLDERING POSITION (NONE)......................................................................................................... 23
7.3CIRCULATING ROUTE OF COOLING AIR........................................................................................................... 24
8. DISMANTLING OF PARTS........................................................................................................................... 25
8.1 PARTS ON THE DOOR .................................................................................................................................. 25
8.2PARTS INSIDE THE REFRIGERATOR................................................................................................................ 25
8.3 LIGHT SYSTEM............................................................................................................................................ 26
8.4AIR DUCT COMPONENTS IN REFRIGERATING CHAMBERAND FAN MOTOR ......................................................... 27
8.5AIR DUCT COMPONENTS IN FREEZING CHAMBERAND FAN MOTOR................................................................... 28

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8.6 EVAPORATOR AND DEFROST SYSTEM........................................................................................................... 30
8.7 COMPRESSOR CASE ................................................................................................................................... 31
8.8 DISPLAY CONTROL BOARD........................................................................................................................... 36
8.9 MAIN CONTROL BOARD ............................................................................................................................... 37
8.10 BAR COUNTER(NONE) .............................................................................................................................. 37
8.11 WATER DISPENSER ................................................................................................................................... 37
8.12ICE MAKER................................................................................................................................................ 38
8.13WATER FILTER COMPONENT........................................................................................................................ 39
9.TEMPERATURE SENSING SYSTEM ........................................................................................................... 41
9.1 POSITION OF SENSORS ............................................................................................................................... 41
9.2 REPLACEMENT OF SENSORS ....................................................................................................................... 41
9.3SENSOR REPLACEMENT............................................................................................................................... 43
9.4SENSOR RESISTANCE(R/T).......................................................................................................................... 44
10. FUNCTION AND OPERATION ................................................................................................................... 45
10.1 OPERATION PANEL.................................................................................................................................... 45
10.2 DISPLAY................................................................................................................................................... 45
10.3TEMPERATURE CONTROL........................................................................................................................... 46
10.4 OPEN DOORALARM .................................................................................................................................. 46
10.5FUNCTION SELECTION............................................................................................................................... 46
10.6CONTROL OF ICE MAKER............................................................................................................................ 47
10.7 CELSIUS FAHRENHEIT CONVERSION........................................................................................................... 47
10.8FAULT CODE AND SOLUTIONS ..................................................................................................................... 47
10.9DEFROSTING FUNCTION............................................................................................................................. 50
10.10 EYE ICE MACHINE TEST MODE.............................................................................................................. 50
10.11BACKUP DATA FOR POWER FAIL................................................................................................................. 50
11. COMPRESSOR........................................................................................................................................... 51
11.1COMPRESSOR ON AND OFF CONTROL SPECIFICATIONS ................................................................................ 51
11.2VARIABLE FREQUENCY DRIVER BOARD FAULTANALYSIS................................................................................ 51
12. TROUBLESHOOTING METHOD ............................................................................................................... 52
12.1 NO COOLING(AIR COOLING-ELECTRONIC).................................................................................................. 52
12.2 NO WORKING OF COMPRESSOR................................................................................................................. 53
12.3 INSIDE FROSTING,NO DEFROSTING............................................................................................................ 53
12.4 INSIDE FROSTING,NO DEFROSTING-MAINTENANCE GUIDELINES .................................................................. 54
12.5 LIGHT IS NOT ON....................................................................................................................................... 55
12.6FAN FAILURE ............................................................................................................................................. 55
12.7DEFECTIVE DEFROST CIRCUIT .................................................................................................................... 56
12.8NOISE....................................................................................................................................................... 56
12.9AIR DUCT NOT OPERATED(ELECTRONICALLY)............................................................................................... 57
12.10ICE MAKER NOT MAKE ICE......................................................................................................................... 57
13. FIGURES AND DETAILS OF REPAIR PARTS .......................................................................................... 58

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1. Significant update notes(None)

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2. Safety Warning Code
2.1 Warning for operation safety
Important Safety Instructions
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
This symbol indicates that dangerous voltage
constituting a risk of electric shock is present
within your freezer.
This symbol indicates that there are important
operating and maintenance instructions in the
literature accompanying your freezer.
WARNING
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this appliance near water.
6) Clean only with a damp cloth.
7) Do not block any ventilation openings.
8) Install in accordance with the manufacturer’s instructions.
9) Do not install near any heat sources, such as radiators, heat registers, stoves, or
other apparatus that produce heat.
10) Do not defeat the safety purpose of the polarized or grounding-type plug.A
polarized plug has two blades with one wider than the other. Agrounding type plug has two
blades and a third grounding prong. The wide blade or the third prong are provided for your
safety. If the provided plug does not fit into your outlet, consult an electrician for replacement
of the obsolete outlet.
11) Protect the power cord from being walked on or pinched, particularly at plugs,
convenience receptacles, and the point where they exit from the appliance.
12) Do not attempt to modify or extend the power cord of this appliance.
13) Unplug this appliance during lightning storms or when it will not be used for long
periods of time.
14) Make sure that the availableAC power matches the voltage requirements of this
appliance.

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CONNECTING ELECTRICITY
Electrical Shock Hazard.
Plug into a grounded 3-prong outlet.
Do not remove the ground prong.
Do not use an adapter.
Failure to follow these instructions can
result in death, fire, or electrical shock.
WARNING
Electric Shock Hazard
Failure to follow these instructions can result in electric shock, fire, or
death.
1) WARNING–Keep ventilation openings, in both the freezer and the built-in structure,
clear of obstruction.
2) WARNING–Do not touch the interior of the freezer with wet hands. This could result
in frost bite.
3) WARNING–Do not use mechanical devices or other means to accelerate the
defrosting process, other than those recommended by the manufacturer.
4) WARNING–Do not damage the refrigerant circuit.
5)WARNING–Do not damage the refrigerant tubing when handling, moving, or using the
freezer.
6) WARNING–DANGER–Never allow children to play with, operate, or crawl inside the
freezer. Risk of child entrapment. Before you throw away your old freezer:
6-1) Take off the doors
6-2) Leave the shelves in place so that children may not easily climb inside
7) Unplug the freezer before carrying out user maintenance on it.
8) This freezer can be used by children age eight years and older and persons with
reduced physical or mental capabilities or lack of experience and knowledge if they are
given supervision or instruction concerning the use of the freezer in a safe way and
understand the hazards involved. Children should not play with the freezer. Cleaning and
maintenance should not be performed by children without supervision.
9) If a component part is damaged, it must be replaced by the manufacturer, its service
agent, or similar qualified persons in order to avoid a hazard.
10) Please dispose of the freezer according to local regulations as the freezer contains
flammable gas and refrigerant.
11) Follow local regulations regarding disposal of the freezer due to flammable
refrigerant and gas. All refrigeration products contain refrigerants, which under the
guidelines of federal law must be removed before disposal. It is the consumer's responsibility
to comply with federal and local regulations when disposing of this product.
12) This freezer is intended to be used in household and similar environments.

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13) Do not store or use gasoline or any flammable liquids inside or in the vicinity of this
freezer.
14) Do not use extension cords or ungrounded (two-prong) adapters with this freezer. If
the power cord is too short, have a qualified electrician install an outlet near the freezer. Use
of an extension cord can negatively affect the freezer’s performance.
Grounding requirement
This freezer must be grounded. This freezer is equipped with a cord having a grounding
wire with a grounding plug. The plug must be inserted into an outlet that is properly installed
and grounded.
Improper use of the grounding plug can result in a risk of electric shock. Consult a
qualified electrician or service person if the grounding instructions are not completely
understood, or if doubt exists as to whether the freezer is properly grounded.
2.2 Safety instruction for refrigerant
Explosion Hazard.
Keep flammable materials and vapors, such as gasoline, away from freezer. Failure to do so
can result in fire, explosion, or death.
Safety instruction for refrigerant
DANGER–Risk of Fire or Explosion. Flammable Refrigerant Used. To Be Repaired Only By
Trained Service Personnel. Do Not Use Mechanical Devices. Do Not Puncture Refrigerant
Tubing. CAUTION–Risk of Fire or Explosion. Flammable Refrigerant Used. Consult Repair
Manual/Owner’s Guide Before Attempting To Service This Product. All Safety Precautions
Must be Followed. CAUTION–Risk of Fire or Explosion. Dispose of Properly InAccordance
With Federal Or Local Regulations. Flammable Refrigerant Used. CAUTION–Risk of Fire or
Explosion Due To Puncture Of Refrigerant Tubing; Follow Handling Instructions Carefully.
Flammable Refrigerant Used.

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3. Transport
3.1Handling
Handling
1)Protect the refrigerator in moving it,Same as shown as
left photo, please move it by handcart with cushion
2)Remove all packing materials and bottom cushion, the
move into house for placement
3)After moving it to appropriate location, wait for 2 hours
before power on.

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4. Installation and commissioning
4.1Door Disassembly and Assembly
The refrigerator door needs to be dismantled if it cannot enter the room in the whole.
Disassembly of Freezer door
1) Use cross screwdriver to remove the screws by
anticlockwise, and then take out the protective cover.
2) Pull out the spacing guard sheet at the two ends of
water connector, and then push the locked cushion
inwards, meantime pull out water pipe.
Note: please make sure the fast connector can’t be left at
the end of water pipe of door
3) As shown as right photos, use screwdriver to remove
the 5 pcs screws, and then remove the upper hinge
cover.
1) Disconnect the 5pcs fast connectors, then use cross
screwdriver or socket spanner to remove the 2pcs
M5 screws and 1 pc grounding screw by
anticlockwise.
Note: please make sure the freezer door fit closely to
the cabinet; otherwise the refrigerator door may fall
down during above operation.

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5) Lift up the freezer door until the hinge axis separated
from the axis hole of door, then carry the door to a
suitable place.
Disassembly of refrigerator door
1) Use cross screwdriver or socket spanner to remove
the 2 pcs M5 screws by anticlockwise, and then remove
the upper hinge.
Note: please make sure the refrigerator door fit closely to
the cabinet; otherwise the refrigerator door may fall down
during above operation.
2) Lift up the refrigerator door until the hinge axis
separated from the axis hole of door, then carry the door
to a suitable place.
Assembly of freezer door
1) Put the freezer door down gently until the axis of hinge
inserted into the axis hole of door completely.

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2) Put the upper hinge on suitable position, then use
cross screwdriver or socket spanner to fix the 2 pcs M5
screws and 1 pc grounding screw by clockwise, and
connect the 6 pcs fast connectors.
3) Push the locked cushion of water connector inwards,
then insert the water pipe into the water connector to the
end, and finally assemble the spacing guard sheet.
Note: the water pipe can’t be connected incorrectly, only
the water pipes in same color can be connected
4) Assemble the protective cover and fix the screws
assembly of refrigerator door
1) Put the refrigerator door down gently until the axis of
hinge inserted into the axis hole of door completely, and
then closes the door, to make sure the refrigerator door
fit the cabinet closely.

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2) Put the upper hinge on suitable position, then use
cross screwdriver or socket spanner to fix the 2 pcs M5
screws.
3) Put the hinge cover on suitable position, and then use
the screwdriver to fix the 5 pcs screws.
4.2Installation location
Installation location
Location that is easy for ventilation shall be chosen to
facilitate heat dissipation, enhance its performance and
reduce the energy consumption.
4.3Leveling of the refrigerator
Leveling of the refrigerator

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If the refrigerator cannot be placed steadily, adjust the
footing to level it.
4.4Left or right open door reversal(None)
Door reversal
Door reversal
None
4.5Installation of handle(None)
Installation of handle
Installation of handle
None
4.6Installation of door lock（None）
Installation of door lock
Installation of door lock
None
4.7Adjustment to level the door
Adjustment to level the door（Upanddown）
1) Refrigerator door lower: loosen locking nut
counterclockwise, then rotate the adjusting nut
counterclockwise to adjust the height of door, at last
tighten the locking nut clockwise.
2) Refrigerator door higher: loosen locking nut
counterclockwise firstly, then rotate the adjusting nut
clockwise, at last tighten the locking nut clockwise.
Adjustmenttoinhomogenousaperture the door(Upanddown)

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1) Use screwdriver to remove the 5 pcs screws, and
then remove the upper hinge cover. Use screwdriver
to loosen the 2 pcs screws, right and left adjust the
upper hinge to make door aperture be
homogeneity. Put the hinge cover on suitable
position, and then use the screwdriver to fix the 5
pcs screws.
Adjustmentto plane the door (left and right)
1) Use screwdriver to remove the 5 pcs screws, and
then remove the upper hinge cover. Use screwdriver
to loosen the 2 pcs screws, front and backed just the
upper hinge to make door aperture be
homogeneity.
2) Put the hinge cover on suitable position, and then
use the screwdriver to fix the 5 pcs screws.

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5. Product configuration and dimension
5.1 Main parts and their names
(The picture is only for reference, and specific appearance and configuration are subject to the real
product)
Freezer chamber
Refrigerator chamber
1door rack
2ice tank
3shelf
45door rack
6shelf
7drawer
8shelf
9drawer
10door rack
11LED lighting
12door rack
13shelf
14door rack
15shelf
16shelf
17vegetable crisper
18shelf
19vegetable crisper
20door rack

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5.2 External dimension
Description
Code
HC-970WE
Size (mm)
Height to Top of Case
A
1775
Width
B
911
Depth w/Handle
C
860
Depth w/Handle
C1
860
Depth (Door open 90 deg. w)
D
1273
Width (Door open 90 deg. w)
E
1039
Depth (Door open 135 deg. w)
F
1226
Width (Door open 135 deg. w)
G
1560
(The picture is only for reference)

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5.3Location of S/N
Some products also have S/N on the lower part of the right side of the Cabinet.

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6. Product specification
6.1Electrical parameters
Applicable Models
HC-957WEN
Product Name
UR-BCD746WE-DT
Product Code
22031050000741
Item
Specification
Specification
Refrigerant
R600a
Compressor
DZ120V1U
Starter(PTC)
None
Overload protector(OLP)
B110-105
Integrate PTC+OLP
None
Variable frequency driver board
HGFM/220-240V(50/60)Hz
Capacitor
None
Power filter
Have
Power reactor
None
Winding resistance of compressor
wiring terminal
Rmc: 9.30Ω±5%
Rsc: 9.30Ω±5%
Rms;9.30Ω±5%
Winding resistance picture
The input power of compressor
165W
Motor
Fan motor of the freezing chamber
DC12V/≤3.5W
Electric damperof the refrigerating
chamber
DC12V 60mA
Condensation fan
DC12V 2.5W
separation the ice motor
DC12V 6W
ice output motor
DC165V
Open door motor
DC12V
Lights inside the refrigerator
Lights inside the freezing chamber
12V≤2.5W
Lights inside the refrigerating
chamber
12V≤2.5W
othersLights
5V≤1W
Switch of the refrigerator door
□Mechanical switch
■Magnetism control switch

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6.2Cooling temperature setting range
Compartment
The highest (oC)
Lowest (oC)
Freezing
-14
-22
Refrigerating
7
1
6.3Defrosting parts
electronic type
Item
Specification
Defrosting sensor
NTC B3839
Fuse
77℃
Defrost heater in freezing chamber
115V 240W
6.4Circuit diagram
F: Freezer; R: Refrigerator; FD: Freezer Defrost; C: Condensation;.A:ambient temperature
6.5Main control board structure diagram