Haier HRF-488FR/A Parts Manual

Parts & Service Manual

Top Mounted Refrigerator

Model:

HRF-488FR/A

MARCH 2013

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MODEL HRF-488FR/A(BCD-409WD)

Part1.Specifications

Model HRF-488FR/A

BCD-409WD
Cavity Supply(V/Hz) 220-240~/50
Power Consumption(kW•h/year)
Unit Dimensions (WDH)(cm) 76.3 X 158.8X71.4
Unit Weight(Kg) 100
Box Dimensions(WDH)(cm) 84.5 X 162X79
Box Weight(Kg) 107
Box Cubic(Cubic Feet) 45.1
Container Quantity(40’Hc) 41

Specifications are subject to change without prior notice.

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Part3. Principle of Electric Control

Schematic Circuit Diagram

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Brief Description of Control Principle

HRF-488ER/A is the forced air cooling refrigerator with two doors.
A mechanical type of all the control is generally adopted. The
thermostat directly controls the start and stop of compressor, and
hence the refrigerator temperature.

Low Temperature Compensation in the above schematic diagram,
When the ambient is below the set temperature, the switch will be
closed and the heating will work, thus ensuring the normal start, and
operation of refrigerator at lower ambient temperature, in such case,
the freezer compartment temperature can reach a good point.

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ice maker (preparative)

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power cable

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Part6. Troubleshooting and Repair

6.1 Normal Phenomena—Not Troubles for Refrigerators

In a domestic refrigerator, there is not only a complicated electric control
system, but also a refrigerating system that is difficult to discern whether it is in
a good working condition. Both the systems are related and affect each other. If
a certain part of a refrigerator works abnormally .Its refrigerating efficiency will
decrease, operation properties will become unstable, or even it cannot be used
normally for those serious cases.

Refrigerators are generally of larger volume, once troubles appear, to send them
to a service department is really a tough thing, if such is the case, the user will
always be in suspense, sometimes, normal phenomena will be erroneously
regarded as troubles. Therefore, before we deal with the topics of frequently
occurring troubles of refrigerators and their remedies, we should firstly give a
brief account of some normal phenomena which are not troubles .In case any
one of such phenomena occurs, there is no need to worry about it, and the user
can use it at total ease.

1). When the compressor of a refrigerator has just stopped running, a rumbling
sound can be heard from inside its evaporator. This is a sound caused by the
flowing of refrigerant in the evaporator tubing. Because the pressure difference
is still greater after the compressor has just stopped running, the refrigerant will
flow for a certain time; therefore, this sound is a normal phenomenon.

2). A click sound can often be heard from the refrigerator. This is a normal
sound produced by the pull-in or release of the armature of a current deadweight
start relay when starting the compressor .The compressor motor will produce a
slight and uniform sound while it is running. This sound is not easy to be heard
in the daytime, but of course it can be heard distinctly at night.

3).The compressor consists of an electric motor and a compressing
apparatus .During its normal operation ,the motor’s stator core and windings

will rise to a temperature in the range of 100
the piston and cylinder of the compressing mechanism can also reach as above
100
radiates to the air through the compressor casing ,therefore ,its casing is

due to the heat produced when compressing refrigerant .Most of the heat

~110 ,and the temperature of

generally at a temperature between 85
summer when the ambient temperature is higher .All these are normal
phenomena .

~90 ,it is very hot ,particularly in

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4). For the forced air cooling refrigerator, a kind of irregular crack sound can be
often heard when the compressor is running for a certain period of time or has
just stopped its running. The stress relief due to expansion and contraction
causes this sound when temperature changes, and will not affect the normal
application of refrigerator.

6.2 Common Troubles in Refrigerators and Their Remedies

Causes for troubles occurring in refrigerators are closely related to the quality of
components and workmanship in assembling by manufacturers as whether
refrigerators are properly used and maintained .The parameters generally used to
express the working conditions of a refrigerator include the temperature inside
the refrigerator, operation rate, electric power consumption, noise level, and
other functional indexes .If any one of these parameters is beyond its
permissible range, this indicates that there is a fault or trouble in the refrigerator.

During the whole service life of a refrigerator, the probability of troubles
occurring within a union time is called its failure rate. Making a comparison
between the control circuit system of a refrigerator and its refrigerating system,
we can find that the failure rate of the former is higher, and that of the
thermostat is the highest. In troubleshooting, the first thing you must do is to
determine where the trouble comes from --- the control system or the
refrigerating system. There is general no trouble indicating instrument mounted
on the domestic refrigerator, locations and natures of troubles should be
determined according to their respective features, therefore, experience in
servicing is very important to troubleshooting. Service technicians with rich
experience can correctly locate them and take reasonable remedy measures
based on their comprehensive analysis of trouble characteristics as well as
operating conditions for various kinds of refrigerators.

Three Essentials for Checkup

1) Look

a) Check the tubing of refrigerating system for cracks and various welding
points for leaks; if leakage occurs, an oil stain can be seen definitely .
b) Check the suction and exhaust pressure values (high pressure and low
pressure) of compressor to see whether they are normal.
c) Check the conditions of frost attached to its evaporator and gas return
tube .It is abnormal if frost has formed on part of the evaporator or there is no

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frost attached to it. (This criterion is not applicable to the evaporator of
refrigerator compartment.)
d) Pay attention to the speed of temperature drop inside both the
refrigerator compartment and freezer compartment .It is abnormal if the speed
of temperature drop is obviously slower than the corresponding normal speed.
e) Check the environment to see whether it is suitable for placing a
refrigerator.
f) Check refrigerator door seal, case, and table surface and heat insulation
layer.

2) Listen

a) Listen to the noises produced when the compressor is running
Hums from a fully enclosed aggregate unit is the sound caused by overload
indicating that the motor cannot be started normally, meanwhile, a clattering
sound can be heard from inside the start relay, which is produced because the
start contacts cannot be released normally whistling sound is caused by the high
pressure gas flowing out of the crack of the pressure tube inside the compressor,
and clucks are the sound of striking after the suspended spring inside the
compressor has broken.
During the normal operation of compressor, a slight and uniform hum sound
due to undulation of electric current can be heard generally, this is a normal
phenomenon. However, if it sounds like “tong, tong…”, i.e., an impact sound
inside the compressor, this means that a large quantity of wet vapor of
refrigerant or refrigerating oil has come into the compressor cylinder; if it
sounds like “dang, dang…”, a striking sound of metal parts inside the
compressor ,this means that some moving parts have loosened (note to
differentiate this sound from those formed during starting or stopping the
compressor).
b) Listen to the sound caused by the flowing of gas in the evaporator
Open the refrigerator door while the compressor is in operation , incline your
ear and listen attentively the gas flow sound inside the evaporator .If it sounds
like gentle whistling accompanied by a sound similar to water flowing ,this is
the sound produced by the normal circulation of refrigerant within the
evaporator .In case only the gas flowing sound can be heard and there is no
water flowing sound ,this indicates that the refrigerant has already percolated .If
neither the flowing sound nor the gas sounds from the evaporator can be
heard ,this means that the filter or capillary has been clogged .

3) Touch and Feel

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a) Feel the compressor when running ,its temperature should be generally
less than 90

in the normal state (it may exceed 90 in case of running for a

longer period of time ).
b) After the compressor has operated normally for 5~10 minutes, touch
and feel the condenser, the temperature of its upper part should be higher than
that of its lower part (or its right part is hotter than its left part, depending on the
type of condenser coil), this indicates that the refrigerant is circulating. If the
condenser is not hot, this means the leakage of refrigerant, In case the condenser
radiates heat for only several minutes and then cools down, this means that the
filter and capillary have been clogged. As for the forced air cooling condenser,
hot air will be blown out of it; this means that the system is out of order.
c) Feel the filter’s temperature. During the normal operation of
refrigerating system, the temperature on the filter’s surface should be a little
higher than the ambient temperature; if you touch it with your hand, you will
have a sense of slight heat. In case dew condensation appears due to the fact that
its temperature is obviously lower than the ambient temperature, this means that
most meshes of its screen has been clogged, resulting in an obstructed flowing
of refrigerant, thus causing a drop in temperature due to throttling.
d) Feel the temperature of exhaust gas from the refrigerating system .the
exhaust gas should be very hot and this is the normal working state. For those
refrigerator with enclosed type of compressor refrigerating system, no frost or
dew drop will from on the gas suction tube, otherwise, there is something wrong
in the system (Frosting and dew condensation may appear for a very short time
period when just starting the machine, this is a normal phenomenon).

Because a refrigerator is a combination of several components, they are related
and have influence on each other .In case an abnormal phenomenon has been
found through the above-mentioned checkups, you need not to make a hasty
conclusion based on only one abnormal phenomenon .It is advisable to find out
two or more abnormal phenomenon, or conduct troubleshooting
comprehensively with the aid of instruments or other ways, because several
kinds of troubles may share a common abnormal phenomenon, and two or more
abnormal phenomena may occur simultaneously due to a certain trouble .With
this method , you can reject some suspicious troubles and finally make a correct
judgment .

6.3 Analysis of Troubles and Troubleshooting

A. Poor Refrigerating Effect

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The so-called “poor refrigerating effect “ refers to the fact that the refrigerator
can operate and refrigerator normally, but the temperature in the refrigerator
cannot drop to the prescribed value under the stipulated working conditions. In
view of there are many causes for this phenomenon, we are going to discuss and
analyze it in the following 7 aspects:

1) Leakage of refrigerant
Analysis of Trouble
The leakage of refrigerant in the system will result in an insufficient
refrigerating capacity, the resulting phenomena are its lower gas suction
pressure and exhaust pressure as well as higher exhaust gas temperature. The
exhaust tube feels rather hot, and a continuous gas flowing sound louder than
usual can be heard at the outlet of the capillary, and no frost or a smaller
quantity of loose frost appears on the evaporator. After shut down, the balance
pressure in the system is usually lower than the saturation pressure
corresponding to the same ambient temperature.

Remedy
In case there is leakage of refrigerant from the system, do not hurry to recharge
it with refrigerant, manage to find out leak points immediately, and make a note
of from where it leaks ---welding points and parts. After having them repaired,
recharge refrigerant.
There are so many joints and sealed surfaces in a refrigerator, accordingly, quite
a lot potential leak points do exist in the system. In troubleshooting, pay
attention to those parts that are liable to leak, check main connection points for
oil seepage and tubing for cracks. If there is no severer leak point, charge the
system with nitrogen and detect leak points with the commonly adopted method,
repair them, evacuate, charge the system with refrigerant, and then turn on the
refrigerator to make a test run.

2) Too much refrigerant charged into the system

Analysis of Trouble
a) In case the amount of refrigerant charged into the system exceeds its
nominal capacity, the superfluous refrigerant will of course take some space of
the evaporator, thus reducing its heat-dissipation area and hence the
refrigerating efficiency of the system. The abnormal phenomena caused by this
reason are as follows: the gas suction and exhaust pressures are generally higher
than their respective normal values, the temperature of its condenser is higher
and the electric current of the compressor rises, loose frost forms on the

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