Midea HS-625FWEN User manual

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Service Manual
Upright Frz. Series
Applicable Models
Product Models
Applicable Models
HS-625FWEN
UR-BD481WE-ST
22031010002925
WHS-625FWEW1
UR-BD481WE-ST
92031010Z01401
WHS-625FWESS1
UR-BD481WE-ST
92031010Z01402
MRU17F6AWW
UR-BD481WE-ST
92031010Z01403
MU170CWBR1RC1
UR-BD481WE-ST
92031010Z01404
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 AND ASSEMBLY ........................................................................................................................ 9
3.3 INSTALLATION LOCATION ............................................................................................................................................ 9
3.4 LEVELING OF THE REFRIGERATOR........................................................................................................................... 10
3.5 LEFT OR RIGHT OPEN DOOR REVERSAL （NONE）................................................................................................ 10
3.6 INSTALLATION OF HANDLE........................................................................................................................................ 10
3.7 INSTALLATION OF DOOR LOCK（NONE）................................................................................................................ 10
4. MAIN PARTS AND EXTERNAL DIMENSION....................................................................................................11
4.1 MAIN PARTS.............................................................................................................................................................. 11
4.2 EXTERNAL DIMENSION ............................................................................................................................................. 12
4.3 MIDEA PRODUCT SERIAL NUMBER AND LOCATION ................................................................................................... 13
5. ELECTRIC CONTROL SYSTEM.........................................................................................................................14
5.1 ELECTRICAL PARTS PARAMETERS............................................................................................................................ 14
5.2 CIRCUIT DIAGRAM .................................................................................................................................................... 16
5.3 MAIN PCB TERMINAL CONNECTION DIAGRAM......................................................................................................... 17
5.4 INVERTER BOARD TERMINAL CONNECTION DIAGRAM（NONE）............................................................................. 17
6. REFRIGERATION SYSTEM................................................................................................................................18
6.1 REFRIGERATION SYSTEM WORKING PRINCIPLE....................................................................................................... 18
6.2 COOLING PIPELINE AND DRAIN PIPE INSIDE THE CABINET........................................................................................ 18
6.3 CIRCULATING ROUTE OF COOLING AIR..................................................................................................................... 19
6.4WELDING POINTS IN CHAMBERS OR FOAM LAYER.................................................................................................... 19
6.5WELDING POINT IN THE COMPRESSOR CASE........................................................................................................... 20
7. DISMANTLING OF PARTS..................................................................................................................................21
7.1 PARTS ON THE DOOR................................................................................................................................................ 21
7.2 PARTS INSIDE THE REFRIGERATOR .......................................................................................................................... 21
7.3 LIGHT SYSTEM.......................................................................................................................................................... 22
7.4AIR DUCT COMPONENTS IN REFRIGERATING CHAMBERAND FAN MOTOR (NONE).................................................. 22
7.5AIR DUCT COMPONENTS IN FREEZING CHAMBERAND FAN MOTOR.......................................................................... 23
7.6 EVAPORATOR AND DEFROST SYSTEM...................................................................................................................... 24
7.7 COMPRESSOR CASE ................................................................................................................................................ 25
7.8 DISPLAY CONTROL BOARD ....................................................................................................................................... 29
7.9 MAIN CONTROL BOARD ............................................................................................................................................ 30

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7.10 VARIABLE FREQUENCY DRIVER BOARD（NONE）................................................................................................ 31
7.11 WATER DISPENSER（NONE）............................................................................................................................... 31
8. TEMPERATURE SENSING SYSTEM.................................................................................................................32
8.1 POSITION OF SENSORS............................................................................................................................................ 32
8.2 REPLACEMENT OF SENSORS ................................................................................................................................... 32
8.3 SENSOR WITHOUT TERMINAL REPLACEMENT .......................................................................................................... 34
8.4 SENSOR R/TTABLE.................................................................................................................................................. 35
9. FUNCTION AND OPERATION............................................................................................................................36
9.1 DISPLAY OPERATION PANEL ..................................................................................................................................... 36
9.2 TEMPERATURE CONTROL......................................................................................................................................... 37
9.3 MODE SETTING......................................................................................................................................................... 37
9.4 DEFROSTING FUNCTION........................................................................................................................................... 38
9.5 OPEN DOORALARM.................................................................................................................................................. 38
9.6 ERROR CODE AND SOLUTIONS................................................................................................................................. 39
9.7 TEST MODE............................................................................................................................................................... 41
9.8 DEMO MODE............................................................................................................................................................. 42
9.9 BACKUP DATA FOR POWER FAIL ............................................................................................................................... 42
10. COMPRESSOR ..................................................................................................................................................43
10.1 COMPRESSOR ON AND OFF CONTROL SPECIFICATIONS........................................................................................ 43
10.2 INVERTER BOARD FAULTANALYSIS（NONE）....................................................................................................... 43
11. TROUBLESHOOTING METHOD......................................................................................................................44
11.1 NO COOLING (AIR COOLING-ELECTRONIC)............................................................................................................ 44
11.2 NO WORKING OF COMPRESSOR............................................................................................................................. 46
11.3 INSIDE FROSTING,NO DEFROSTING....................................................................................................................... 47
11.4 INSIDE FROSTING,NO DEFROSTING-MAINTENANCE GUIDELINES.......................................................................... 48
11.5 LIGHT IS NOT ON..................................................................................................................................................... 49
11.6 FAN FAILURE........................................................................................................................................................... 50
11.7 DEFECTIVE DEFROST CIRCUIT ............................................................................................................................... 50
11.8 NOISE..................................................................................................................................................................... 51
11.9AIR DUCT NOT OPERATED（OPTION）.................................................................................................................. 51
11.10 ICE MAKERNOT MAKE ICE（OPTION）................................................................................................................ 52
12. PRODUCT EXPLODED VIEW AND SPARE PARTS LIST.............................................................................53

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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 available AC 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 In Accordance
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 （None）
3.6 Installation of handle
Installation of handle
1）Take two handle screws, install them in the door hole
2）Alignment screw installation handle
3）Fix screws in the side hole of the handle.
Note: The wrench and screws are placed in the
appendage bag.
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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4.2 External dimension
Description
Code
Size (mm)
Height to top of Cabinet
A
1650
Width
B
830
Depth w/Cabinet
C
660
Depth w/Door
D
735
Depth w/Handle
E
794
Depth (Door open 90 deg. w)
F
1528
Depth (Door open 135 deg. w)
G
1310
Width (Door open 135 deg. w)
H
1442
(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
HS-774FWEN
Product Model
UR-BD481WE-ST
Product code
22031010002925
Rated Voltage
115V、60Hz
Item
Specification
Refrigerant
R600a
Compressor
EZ75E1A (GMCC)
(Part code : 11101010011093)
Starting device type
Fixed Speed
The COP of compressor
1.64 (W/W)
The max cooling capacity of
compressor
153 W
Winding resistance of compressor
wiring terminal (20℃)
Rmc:5.35Ω±7%
Rsc:8.01Ω±7%
Rms = Rmc + Rsc
Winding resistance picture
Starter(PTC)
8EA14C3-02
(Part code : 12031000001063)
Overload protector(OLP)
4TM302TFBYY
(Part code : 12031000001311)
Integrate PTC+OLP
None
Variable frequency driver board
None
Capacitor
8μF、250V
Power filter (EMI)
None
Power reactor (EU EMC)
None
Motor
Fan motor of the freezing chamber
DC12V、2.4 W、2020r/min
Fan motor of the refrigerating
chamber
None
Electric damper
None
Lights
Lights inside the top of refrigerating
chamber
None
Lights inside the freezing chamber
DC12V、≤6W
Others Lights
None

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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、320W

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

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5.3 Main PCB terminal connection diagram
The connecting terminals list
Connecting terminals
Connecting terminals
1+2.Power supply
3. Compressor
4. Freezing defrost heater
5.Display control panel (Internal)
6. Light switch
7. Freezing temperature sensor
8. Freezing defrost sensor
9. Ambient temperature sensor
10. LED of freezing chamber
11. Freezing fan motor
12. Display control panel(outer)
5.4 Inverter board terminal connection diagram（None）

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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
Copper pipe:
Φ6.35
2-Heat transition tube and outlet of evaporator
Copper pipe: Φ6
Copper pipe:
Φ6.35

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6.5 Welding point in the compressor case
Welding point
Pipe outer diameter (mm)
1-Inlet of right condenser tube and outlet of venting
connection tube
Steel pipe: Φ4.0
Steel pipe: Φ4.0
2-Inlet of anti-condensation tube and outlet of right condenser
tube
Steel pipe: Φ4.0
Steel pipe: Φ4.0
3-Outlet of anti-condensation tube and inlet of left condenser
tube
Steel pipe: Φ4. 0
Copper pipe: Φ4.0
4-Outlet of left condenser tube and inlet of dry filter
Steel pipe: Φ4. 0
Copper pipe: Φ5.0
5-Outlet of dry filter and inlet of freezer capillary
Copper pipe: Φ2.8
Copper pipe: Φ1.8
6-Heat transition tube and Suction connection tube
Copper pipe: Φ6.0
Copper pipe: Φ6.0
7-Suction connection pipe and compressor intake tube
Copper pipe: Φ6.0
Copper pipe:
Φ8.17
8-Compressor outlet tube and inlet of venting connection tube
Copper pipe:
Φ6.17
Steel pipe: Φ4.0
9-Compressor process tube and refrigerant filling tube
Copper pipe:
Φ8.17
Copper pipe: Φ6.0