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BCD-230W 260W Service Manual

Printed at April 23, 2002

Principle, structure and performance

1.1

Principle and structure

Rongshida refrigerator comprise 3 parts,
refrigeration system, electricity component and
cabinet assembly.

1.1.1

Refrigeration system

It is a vapor compression refrigeration system
filled with R134a refrigerant. Under the action of
compressor, R134a keep cycling within a hermetic
piping, absorbing heat from evaporator and
eliminating heat from condenser, and thus to get
cold. The refrigeration system generally include
the following components:

a)

Compressor: It is a hermetic
reciprocating compressor. The
stock orientation of compressor
should be upright as the figure
show.

Condenser: It is installed on both sides in the
inner of cabinet. The function of that is to cool
the refrigerant vapor down and liquefied it
through natural air convection.

Evaporator: Which is installed inside of the
refrigerator. The function of that is to
evaporate R134a and make cold for
refrigerator.

Capillary: Which is a long and slim copper
tube used to throttle the refrigerant.

Drier-filter: Which is set before the capillary
to absorb the remained water molecules and
filter the mechanic remainders in order to
prevent capillary from blocked up by foreign
substance or iced up by water molecules.

Heat exchanger: its function is improving the
refrigeration efficiency through the heat
exchange between the suction line and
capillary tube to sub-cool the refrigerant liquid
in capillary and overheat the refrigerant vapor
in suction line.

Accumulator: It is located at the outlet of the
evaporator to prevent the refrigerant liquid
rushing into the cylinder of the compressor.

Anti-dew tube: It is set around the edge of
freezer door at the inside of the cabinet foam.
The warm refrigerant gas with the higher
pressure run through it, heat the cabinet
around it, and keep from the build up of the
dew around the door.

Piping: All components of
refrigeration system are connected by
tubes, which include suction tube,
discharge tube, and connection tube,
etc.

Refrigerant: R134a is used in this refrigerator.
Through the refrigerant phase change in the
system, the refrigerator will be cooled down.

Lubricant oil: the lubricant oil ISO22 is used
in this refrigerator. The function of it is
lubricating the surface and cooling down the
temperature of the moving parts in the
compressor.

Refrigeration cycle of this refrigerator is shown as
figure:
Compressor (1)

Left condenser (2)

Anti-dew

tube (3)

Right condenser (4)

Drier-filter (5)

Capillary(6)

Evaporator(7)

Accumulator (8)

Heat Exchanger(9)

Compressor(1)

1.1.2