7. Working principle
The cooling unit applies the theory of phase-transition cooling this way: the gaseous refrigerant
is expelled out of the compressor
,
in high temperature and high pressure
,
enters into
condenser
，
cooled forcibly and liquefied in modest temperature and still high pressure
，
then
goes through the throttling devices such as capillary or expansion valve to become liquid in
lower temperature and lower pressure when it flows into evaporator
，
afterwards
，
it returns
to the condenser by phasechange absorbing the heat of inside enclosure. This reciprocating
circulation guarantees the reliable working environment.
8. Maintenance/care
As
the
maintenance
-
free
cooling
device
，
the
unit
has
been
strictly
tested
before
ex
.
Factory and
all
performance
passed
the
international
certification
.
The
fan
of
ball
bearing
has
a
lifespan
up to
30
，
000
hour
.
The
filter
mesh
is
recommended
to
use
in
case
of
dense
dusts
and
clean
at
twice every
month
.
Turn
off
the
power
if
the
cooling
unit
is
kept
long
not
for
use
.
The
power
must
be
switched
off
in
the
period
of
maintenance
/
care
.
9. Quality warranty
All
the
cooling
units
in
normal
use
(
Refer
to
4
.
Safety
notes
)
shall
be
granted
with
a
year
of free
maintenance
.
During
the
valid
warranty
，
the
faulty
unit
will
be
returned
to
factory
or handled
on
the
site
for
repairs
.
The
product
is
only
limited
to
the
purpose
of
cooling
down
the
enclosure
;
otherwise
Leizig shall
take
on
no
responsibility
for
the
losses
caused
by
any
misconnection
to
power
or
incorrect operations
(
see
regular
operations
).
Electrical
circuit
drawings.
HTTP://WWW.LEIZIG.COM
18
Low pressure
liquid
Low pressure
bapor
Temperature
sensing pack
Expasion valve/capillary
High pressrue
liquid
High pressrue
vapor
Evaporator
Compressor
Condenser
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