BD-478A
BD-478A
Freezer
Service Manual
BD-478A
●Features
●Door lock for safety storage
●High pressure foam cover for efficient Temperature
preservation.
●Adjustable thermostat.
●Superior insulation.
●Efficient defrosted storage
●Designed for cafeterias restaurants and hotels
Haier Group
Manual No.:BD-478A Edition:20051201
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Contents
1. Contents……………………………………………………………………….……1
2. Product Code Illumination and Series Introduction……………………………
3. Features …………………………………………………………………………... 3
4. Specifications………………………………………………………………………4
5. Safety Precautions(including Warning and Cautions)………………………...5
6. Net Dimension……………………………………………………………… …....7
7. Installation and Accessory Parts ………………………………………………. 8
8. Parts and Functions …………………………………………………………… 12
9. System Flow Chart………………………………………………………………13
10. Function Schedule……………………………………………………………… 14
11. Circuit Diagram ………………………………………………………………… 15
12. Maintenance Service and Trouble Shooting
1. System Troubleshooting…………………………………………………16
2. Common freezer problems………………………………………………28
3. Service and technical requirements of R134a freezer ……………… 30
4. Application and maintenance of freezer ……………………………… 33
5. Procedure and tools required for evacuation and Charging …………38
6. Freezers Noise…………………………………………………………… 40
7. National Standard for noise………………………………………………49
8. Measuring technology of freezer performance parameter……………51
13. Exploded View……………………………………………………………………58
14. List of Parts………………………………………………………………………59
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PRODUCT CODE ILLUMINNATION AND SERIES INTRODUCTION
Product Code Illumination and Series Introduction
B D -- □ □
A B C D
A: The first letter of “FREEZER” in Chinese spelling.
B: The first letter of “FREEZER” in Chinese spelling.
C: Capacity. (Unit: litre).
D: Improve Series Number.
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Features
●Door lock for safety storage
●High pressure foam cover for efficient Temperature
preservation.
●Adjustable thermostat.
●Superior insulation.
●Efficient defrosted storage
FEATURES
●Designed for cafeterias restaurants and hotels
● Low power consumption 20% less than the other similar
freezers
● Imported high quality compressor and condenser, large
freezing capacity, 1.5 times more then regular freezers
Freezing quick and deep freeze functions are 2 times faster then
regular freezers
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Specifications
Model BD-388A BD-478A
SPECIFICATIONS
Capacity (L)
Power Supply (V/Hz)
Unit Dimension (W*D*H)
Unit Weight (Kg)
Box Dimensions (W*D*H)
Box Weight (Kg)
Container Quantity (40HC’)
388 478
220V~ /50Hz 220V~ /50Hz
1420*715*810 1690*715*810
72 78
1495*765*870 1765*765*870
84 91
66 57
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SAFETY PRECAUTIONS
Safety Precautions
Read all of the instructions before using this appliance. When using
this appliance, always exercise basic safety precautions, including the
following:
1. Use this appliance only for its intended purpose as described in this
uses and care guide.
2. This freezer must be properly installed in accordance with the
installation section. Instructions before it is used, See grounding
instructions in the installation section.
3. Never unplug your freezer by puling on the power cord, Always
grasp the plug firmly and pull straight out from the outlet.
4. Repair or replace immediately, all electric service cords that have
become frayed or otherwise damaged, Do not use a cord that
shows cracks or abrasion damage along its length, the plug or the
connector end.
5. Unplug your freezer before cleaning or before making any repairs,
Note: If for any reason this product requires service, we strongly,
recommend that a certified technician perform the service.
6. If your old freezer is not being used, we recommend that you
remove the door and leave the shelves in place; this will reduce the
possibility of danger to children.
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SAFETY PRECAUTIONS
Safety Precautions
7. This freezer should not be recessed or built-in an enclosed
Cabinet. It is designed for freestanding installation only
8. Do not operate your freezer in the presence of explosive fumes.
9. Do not refreeze foods, which have been thawed completely.
10.Do not use any electrical device or any sharp instrument in
defrosting your freezer.
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Net Dimension
H
a
NET DIMENSION
H
L
W
Model BD-388A BD-478A
Unit Dimension (W*D*H)
Dimension (Door open)
1420*715*810 1690*715*810
1420*715*1470 1690*715*1470
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INSTALLATION AND ACCESSORY PARTS
Installation and Accessory Parts
Unpacking Your Freezer
1.Remove all packaging material; this includes the foam base and all adhesive
tape holding the freezer accessories inside and outside.
2.Inspect and remove any remains of packing, tape or printed materials before
powering on the freezer.
Adjusting Your Freezer
1.Your freezer is designed for freestanding installation only. It should not be
recessed or built-in.
2.Place the freezer on a floor strong enough to support it fully loaded.
3.When moving the freezer, never tilt it more than a 45-degree angle. This could
damage the compressor and the sealed system.
4.If the freezer is tilted let it stand in an upright position for at least 24 hours prior
to plugging. This is to allow the refrigerant to settle.
·Proper Air Circulation
l To assure your freezer works at the maximum efficiency it was designed for,
you should install it in a location where there is proper air circulation,
l Plumbing and electrical connections.
l The following are recommended clearances around the freezer:
Sides…………..2”(50mm)
Top. ……………2”(50mm)
Back…………..2”(50mm)
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INSTALLATION AND ACCESSORY PARTS
Installation and Accessory Parts
l Do not over fill freezer for proper internal air circulation.
Electrical Requirement
l Make sure there is a suitable power Outlet (220V) with proper grounding to
power the freezer.
l Avoid the use of cutting off the third grounding , this is a dangerous practice
since it provides no effective grounding for the freezer and may result in
shock hazard.
Install Limitations
l Do not install your freezer in any location not properly insulated or heated e.g.
garage etc,
l Select a suitable location for the freezer on a hard even surfaces away from
direct sunlight or heat source e.g. radiators, baseboard heaters, cooking
appliances etc, Any floor unevenness should be corrected.
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Operating Your Freezer
INSTALLATION AND ACCESSORY PARTS
Installation and Accessory Parts
Once the freezer is in its proper place, plug it in an electrical outlet having 220
volts.
Set the temperature, on the temperature contrail knob.”1”being the warmest and
“6”being the coldest. Initially set the temperature on”3”. Place food inside the
freezer After using the freezer for 24 hours set the freezer to your desired
setting.
In case you unplug your freezer or experience an electrical outage, allow 5
Minutes before plugging it back in.
(Note: If the freezer has been placed in a horizontal or tilted position for any
period of time wait 24 hours before plugging the unit in.)
Adjustable temperature dial:
Your freezer will automatically maintain the temperature level you select. The
temperature level you select. The temperature control dial has 6 settings plus
0.”1”is the warmest,”6”is the coldest. Turning the dial to 0 stops cooling the
freezer. Set the dial to “3”and allow 24 hours to pass before adjusting the
temperature to your needs.
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INSTALLATION AND ACCESSORY PARTS
Installation and Accessory Parts
Food Storage Basket
Your Freezer has 1 or 2 removable basket. It allows you to store food more
accessibly or you can remove it if not needed.
Defrosting and Draining The Freezer
·Defrost whenever the frost becomes 5MM thick. Never use a sharp or
metallic instrument to remove the frost as it may damage the cooling
coils.(A punctured coil will void the warranty)
·Turn the temperature control to 0 position and unplug the unit. For draining,
place a tray beneath the outer drain plug. Pull out the drain dial and rotate it
so that the arrow points down ward. This will let the water flow out into the
tray.
·Remove the drain plug from the inside of the freezer. Defrosting usually
takes a few hours. To defrost faster keep the freezer door open. When done,
push the drain dial in and turn the arrow to the up position. Re-plug the
drain plug inside the freezer compartment. Note: monitor the container
under the drain to avoid overflow.
·Wipe the interior of the freezer and replace the electrical plug in the
electrical outlet.
·Rest the temperature control to the desired setting.
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System Flow Chart
SYSTEM FLOW CHART
The refrigeration system of direct cooling single-system freezers
belongs to the category of a single-temperature and single-control
refrigerating system with only one evaporator and is controlled by a
single temperature control.
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FUNCTION SCHEDULE
Function Schedule
Set the temperature, on the temperature contrail knob.”1”being the
warmest and “6”being the coldest. Initially set the temperature on”3”.
Place food inside the freezer .After using the freezer for 24 hours set
the freezer to your desired setting.
In case you unplug your freezer or experience an electrical outage,
allow 5
minutes before plugging it back in.
(Note: If the freezer has been placed in a horizontal or tilted position for
any period of time wait 24 hours before plugging the unit in.)
Adjustable temperature dial:
Your freezer will automatically maintain the temperature level you
select. The temperature level you select. The temperature control dial
has 6 settings plus 01.”1”is the warmest,”6”is the coldest. Turning the
dial to 0 stops cooling the freezer. Set the dial to “3”and allow 24 hours
to pass before adjusting the temperature to your needs.
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Circuit Diagram
Brief description of principle about BD-318A/428A:
CIRCUIT DIAGRAM
Brief description of principle about Thermostat:
When the temperature in the freezer is higher and reaches the
value for starting the machine, the thermostat will be closed, the
compressor will run; When the temperature in the freezer is lower and
reaches the value for closing the machine, the thermostat will be open,
thus the compressor will be stop running.
MAINTENANCE SERVICE AND TROUBLE SHOOTING
Maintenance Service and Trouble Shooting
12.1 System Trouble shooting
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12.1.1 Servicing freezer
(1)Check the whole circuit of freezer, if there are wire connections
came off, any wires broken, or a short circuit.
(2) Check the insulation of the whole freezer. At normal situation,
the resistance is greater than 2 mebohms; if it is less than 2
mebohms, please make a further check of the freezer resistance.
Set the voltmeter to R1 Ohm position, put the two voltmeter leads
pencils into L and N terminals respectively, watch the indication
of odometer. The normal value is several Ohm to tens of ohm. If
the resistance is zero, means that there is a short in the freezer
circuit or there is a short caused by a bad compressor or fan
motor. The reason should be found out and repaired. If the
resistance is too big or infinite, this means that there is broken
circuit, please check and solve it.
After the above checks, the freezer will not have any
electrical problem and you can switch power on for further
completely check.
MAINTENANCE SERVICE AND TROUBLE SHOOTING
Maintenance Service and Trouble Shooting
12.1.2 Reasons of electricity leakage of freezer
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(1) Leakage of compressor: mainly because of serious vibration,
the motor coil of compressor contacts with the shell, the coat of
enameled wire will come off some where and connect with shell.
Other reasons may be over voltage, insufficient of voltage,
adverse circumstances (temperature too high, ventilation and
heat radiation to bad) for freezer, thermal protection unit out of
order, etc. They will make the motor coil over temperature,
insulation material loose, insulation is damaged then electricity
will occur.
(2) Leakage of motor connection terminals: the connection
terminals of fully enclosed compressor are made from high
temperature soda glass sintered ceramics, around the terminals
are filled with a high polymer. The terminals and insulation
material must have the same linear expansion coefficient, the for
requirement between terminals and the shell is more than 0.5
million ohm. The reason of terminal leakage is that soda glass is
broken or there are conductive materials such as water, dirt, etc.,
adhered to terminals.
MAINTENANCE SERVICE AND TROUBLE SHOOTING
Maintenance Service and Trouble Shooting
If electricity leakage occurs outside the compressor, please use
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tetra chloromethane or alcohol to clean it. If the leakage occurs in
the inner of compressor, it needs to be changed.
(3) Leakage of temperature controller: because of too long a
period of service or too high temperature, or too much dirt, or too
high humidity, there may be electricity leakage. If it has been
defined that there is leakage of temperature controller, please
change.
(4) Leakage of starting relay: during mounting and repairing,
screw of relay lead is easy to contact the shell and leakage will
then occur. If you suspect the relay is bad, check it. If there is
leakage, please make the connections again and leave a piece of
insulation paper under the screw.
(5) Leakage of fan: because of too high humidity of freezer
environment or a bad fan controlling unit, the fan is burned after
long time operation and thus causes leakage. Using voltammeter
to measure the insulation resistance between each respective
connection terminal and the freezer body, if the resistance is too
little, means there is leakage caused by humidity; if the resistance
Is zero, means the fan coil is burned or short-circuited. Please
change the fan.
MAINTENANCE SERVICE AND TROUBLE SHOOTING
Maintenance Service and Trouble Shooting
12.1.3 Troubleshooting observation
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(1) At normal operation conditions, the temperature around the
surface of freezer evaporator is nearly the same; the thickness of
frost layer is similar. If there is no frost at the surface of
evaporator (bed type freezer at all of its inner wall), or only a small
part at the upper, conclusion can be made that the operation of
refrigeration system is not normal, the refrigerant is insufficient or
there is leakage.
(2) Check the system tubing and make sure there is no leakage,
especially at the joint connections. Refrigerant has good
permeability, and it also contains a little refrigerant oil. If there is
leak, there will be traces of oil at the leak points.
12.1.4 Troubleshooting by sounds
(1) When the freezer is working normal, high-pressure liquid
refrigerant flows into the low-pressure evaporator via
acapillarytube, a gas flowing sound and water flowing sound can
be heard. Open the freezer door and access to the evaporator, you
can hear the sound. If there is no sound or there is sound a little
now and then, there must be leakage of system refrigerant or
insufficient charge.
MAINTENANCE SERVICE AND TROUBLE SHOOTING
Maintenance Service and Trouble Shooting
(2) After switching on power, Listen to the running sound of the
compressor whether it is normal or not. Whether or not hear
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