Midea HD-676REWN User manual

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Service Manual
BMF No Frost Series
Applicable Models
Product Models
Applicable Models
HD-676REWN
UR-BCD520WE1-SQ
22031020006862
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............................................................................................................................................... 6
2.1WARNING FOR OPERATION SAFETY ........................................................................................................................... 6
2.2 SAFETY INSTRUCTION FOR REFRIGERANT................................................................................................................. 8
3. INSTALLATION AND COMMISSIONING............................................................................................................ 9
3.1 HANDLING................................................................................................................................................................... 9
3.2 DOOR DISASSEMBLY ANDASSEMBLY ........................................................................................................................ 9
3.3 INSTALLATION LOCATION ............................................................................................................................................ 9
3.4 LEVELING OF THE REFRIGERATOR........................................................................................................................... 10
3.5 LEFT OR RIGHT OPEN DOOR REVERSAL................................................................................................................... 10
3.6 INSTALLATION OF HANDLE（NONE）...................................................................................................................... 11
3.7 INSTALLATION OF DOOR LOCK（NONE）................................................................................................................ 11
4. MAIN PARTS AND EXTERNAL DIMENSION....................................................................................................12
4.1 MAIN PARTS.............................................................................................................................................................. 12
4.2 EXTERNAL DIMENSION ............................................................................................................................................. 13
4.3 MIDEA PRODUCT SERIAL NUMBER AND LOCATION ................................................................................................... 14
5. ELECTRIC CONTROL SYSTEM.........................................................................................................................15
5.1 ELECTRICAL PARTS PARAMETERS............................................................................................................................ 15
5.2CIRCUIT DIAGRAM .................................................................................................................................................... 17
5.3 MAIN PCB TERMINAL CONNECTION DIAGRAM......................................................................................................... 18
6. REFRIGERATION SYSTEM................................................................................................................................19
6.1 REFRIGERATION SYSTEM WORKING PRINCIPLE....................................................................................................... 19
6.2 COOLING PIPELINE AND DRAIN PIPE INSIDE THE CABINET........................................................................................ 19
6.3 CIRCULATING ROUTE OF COOLING AIR..................................................................................................................... 20
6.4WELDING POINTS IN CHAMBERS OR FOAM LAYER.................................................................................................... 20
6.5WELDING POINT IN THE COMPRESSOR CASE........................................................................................................... 21
7. DISMANTLING OF PARTS..................................................................................................................................22
7.1 PARTS ON THE DOOR................................................................................................................................................ 22
7.2 PARTS INSIDE THE REFRIGERATOR .......................................................................................................................... 22
7.3 LIGHT SYSTEM.......................................................................................................................................................... 23
7.4AIR DUCT COMPONENTS REFRIGERATING CHAMBER AND FAN MOTOR.................................................................... 26
7.5AIR DUCT COMPONENTS IN FREEZING CHAMBERAND FAN MOTOR.......................................................................... 27
7.6 EVAPORATOR AND DEFROST SYSTEM...................................................................................................................... 29
7.7 COMPRESSOR CASE ................................................................................................................................................ 30
7.8 DISPLAY CONTROL BOARD ....................................................................................................................................... 35
7.9 MAIN CONTROL BOARD ............................................................................................................................................ 36
8. TEMPERATURE SENSING SYSTEM.................................................................................................................38

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8.1 POSITION OF SENSORS............................................................................................................................................ 38
8.2 REPLACEMENT OF SENSORS ................................................................................................................................... 38
8.3 SENSOR WITHOUT TERMINAL REPLACEMENT .......................................................................................................... 40
8.4 SENSOR R/TTABLE.................................................................................................................................................. 41
9. FUNCTION AND OPERATION............................................................................................................................42
9.1 DISPLAY OPERATION PANEL ..................................................................................................................................... 42
9.2 DISPLAY.................................................................................................................................................................... 42
9.3 TEMPERATURE SETTING........................................................................................................................................... 42
9.4 OPEN DOORALARM.................................................................................................................................................. 43
9.5 FUNCTION SELECTION............................................................................................................................................. 43
9.6 ERROR CODE AND SOLUTIONS................................................................................................................................. 43
9.7 DEFROSTING FUNCTION MODE ................................................................................................................................ 44
9.8 TEST MODE............................................................................................................................................................... 44
9.9 DEMO MODE（NONE）........................................................................................................................................... 45
9.10 BACKUP DATA FOR POWER FAIL ............................................................................................................................. 45
10. COMPRESSOR ..................................................................................................................................................46
10.1 COMPRESSOR ON AND OFF CONTROL SPECIFICATIONS........................................................................................ 46
11. TROUBLESHOOTING METHOD......................................................................................................................47
11.1 NO COOLING (AIR COOLING-ELECTRONIC)............................................................................................................ 47
11.2 NO WORKING OF COMPRESSOR............................................................................................................................. 49
11.3 INSIDE FROSTING,NO DEFROSTING....................................................................................................................... 50
11.4 INSIDE FROSTING,NO DEFROSTING-MAINTENANCE GUIDELINES.......................................................................... 51
11.5 LIGHT IS NOT ON..................................................................................................................................................... 52
11.6 FAN FAILURE........................................................................................................................................................... 53
11.7 DEFECTIVE DEFROST CIRCUIT ............................................................................................................................... 53
11.8 NOISE..................................................................................................................................................................... 54
11.9AIR DUCT NOT OPERATED....................................................................................................................................... 54
11.10 ICE MAKERNOT MAKE ICE（OPTION）................................................................................................................ 55
12. PRODUCT EXPLODED VIEW AND SPARE PARTS LIST.............................................................................56

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1. Significant update notes (None)

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2. Safety Warning
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. A grounding 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. Installation and commissioning
3.1 Handling
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 hou
rs before power on.
3.2 Door Disassembly and Assembly
When the whole refrigerator cannot enter the room, the door can be disassembled, then
assembled after entering separately.
3.3 Installation location
Installation location
Please select a ventilated place to place the refrigerator,
and reserve space according to the recommended size
in the picture, which is conducive to heat dissipation,
performance improvement and energy consumption
reduction.

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3.4 Leveling of the refrigerator
Leveling of the refrigerator
If the refrigerator cannot be placed steadily, adjust the
footing to level it. Turn the feet clockwise to raise the
refrigerator; turn the feet counterclockwise to lower the
refrigerator.
3.5 Left or right open door reversal
Door reversal
1) Unplug your refrigerator and remove all food from the
door shelves. Remove all food from the inner door liner.
2) Remove the left cover plate and the right top hinge
cover, then unscrew screws and remove the right top
hinge. Keep the screws to reuse.
3)Lift the refrigerator door up and away from your
refrigerator.
4 )Dismantle the sleeves from the top right of doors and
hole cap from top left of doors, and assemble them on
the other side.
5) Remove the refrigerator door stopper and self-locking
block on the right, take out the left self-locking block and
stopper from the accessory bag in the refrigerator and
installed on the left of door.

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6) Remove the center hinge, remove the center hinge shaft
with a slotted screw driver, install hinge shaft on opposite
side of the hinge and install the hinge to the left of the box.
Put down the refrigerate door on the middle hinge
vertically, then take out the top hinge and cover of other
side from accessory bag, assemble top hinge , hinge
cover and hole cover.
3.6 Installation of handle（None）
3.7 Installation of door lock（None）

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4. Main parts and external dimension
4.1 Main parts
(The picture is only for reference, and specific appearance and configuration are subject to the real
product)

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Freezer chamber
Refrigerator chamber
❻Air duct assembly of freezer room
❼Top drawer of freezer
❽Drawer under freezer
❾Adjustable foot
❶Lamp box component
❷Air duct assembly of refrigerator room
❸Glass shelf of refrigerator room
❹Glass shelf of refrigerator room
❺Vegetable crisper
❿small tray in refrigerator room
⓫large tray in refrigerator room
4.2 External dimension
Description
Code
Size (mm)
Height to Top of Case
A
1686
Width
B
750
Depth w/Cabinet
C
670
Depth w/Door
D
705
Depth w/Handle
E
/
Depth (Door open 90 deg. w)
F
1315
Depth (Door open 135 deg. w)
G
1303
Width (Door open 135 deg. w)
H
1275
(The picture is only for reference)

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4.3 Midea product serial number and location
1）Product Serial Number —Including order number, production date and other information. When the
product occur problem, it needs to be recorded or photographed and provided to us.
2）Paste location
Some products also have S/N on the lower part of the right side of the Cabinet.

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5. Electric control system
5.1 Electrical parts parameters
Applicable Model
HD-676REWN
Product Model
UR-BCD520WE1-SQ
Product code
22031020006862
Rated Voltage
115V 60Hz
Item
Specification
Refrigerant
R600a
Compressor
EZ75H1Y
(Part : 11101010002225)
Starting device type
Fixed Speed
The COP of compressor
1.80 (W/W)
The max cooling capacity of
compressor
156 W
Winding resistance of compressor
wiring terminal (20℃)
Rmc:5.05Ω±7%
Rsc:4.43Ω±7%
Rms = Rmc + Rsc
Winding resistance picture
Starter(PTC)
QP2-4R7
(Part co: 12031000001063)
Overload protector(OLP)
DRB31T61A1
(Part co : 12031000001312)
Integrate PTC+OLP
None
Variable frequency driver board
None
Capacitor
10μF、250V
Power filter (EMI)
None
Power reactor (EU EMC)
None
Motor
Fan motor of the freezing chamber
DC12V/≤3.5W
Fan motor of the refrigerating
chamber
None
Electric damper
DC12V
Electric damper heater
0.5W
Lights
Lights inside the top of refrigerating
chamber
LED DC12V
Lights inside the freezing chamber
LED DC12V

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Others Lights
None
Switch of the light
■Mechanical switch
□Magnetism control switch
Defrosting parts
Defrosting sensor
NTC B3839 ( B5/25=3839K±2% )
Fuse in freezing chamber
115V、77(0 ～-5) ℃
Defrost heater in freezing chamber
115V、200W

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5.2 Circuit diagram
F: Freezer R: Refrigerator AMB: Ambient temperature

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5.3 Main PCB terminal connection diagram
Connecting terminals
Connecting terminals
1+2.Power supply
3. Compressor
4. Freezing defrost heater
5. LED of freezing chamber
6. Display control panel
7.Fan of freezing chamber
8. Electric damper heater
9. Electric damper
10. LED of refrigeration chamber
11. Ambient temperature sensor
12. Freezing temperature sensor
13. Refrigeration temperature sensor
14. Freezing defrost sensor
15.Freezing light switch
16.Refrigeration light switch

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6. Refrigeration system
6.1 Refrigeration system working principle
❶Compressor→❷Right condenser→❸Anti-condensation tube→❹Left Condenser→❺Dry
filter→❻Capillary tube→❼Evaporator→❽Suction tube→❶Compressor
6.2 Cooling pipeline and drain pipe inside the cabinet

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6.3 Circulating route of cooling air
6.4 Welding points in chambers or foam layer
1) Welding points on freezer evaporator
Welding point
Pipe outer diameter (mm)
1-Freezer capillary and inlet of evaporator
Copper pipe: Φ6
Aluminum pipe:
Φ6.35
2-Heat transition tube and outlet of evaporator
Copper pipe: Φ6
Aluminum pipe:
Φ6.35