4. ADJUSTMENT
4-1 COMPRESSOR
4-1-1
Role
The compressor
intakes
low temperature and
low
pressure
gas
evaporaled
from
Evaporator of the
Refrigerator, and
condenses
this
gas
to high lemperature and
high
pressure
gas,
and
then
plays
delivering
role to Condenser.
4-1-2 Composition
The Compressor
is Composed
ol Compressor
Apparaius
compressing
gas,
Compressor
Motor moving Compressor
Apparatus and
Case
protecting
Compressor
Apparatus
and
Motor.
There are
PTC-Starter,
and Over Load
Protector
(OLP)
in the Compressor
outside. On
the other
hand,
because
the Compressor
consists of
1/1000mm
processing
precision
components
and is sealed atler
production
in absence
of
dust
or humidily;
deal
and repair
with
care.
4-1-3
Note for
Usage
(1)
Be careful
not to allow over-Voltage
and
over'current.
(2)
No
Strike
lf applying
fbrcible
power
or strike
(dropping
or careless
dealing),
poor
operation
and
noise may occur.
(3)
Use
proper
electric
components
appropriate
to lhe
Comprassor.
(4)
Nole
lo Keep Compressor.
lf
Compressor
gets
wet in the
rain and
rust in
the
pin
of
Hermetic
Terminal,
the
result may be
poor
operation
and
poor
contact
may cause.
t:',
(5)
Be
carelul that
dust,
humidity, and llux
welding don'l
inflow
in the Compressor
inside in replacing
the
Compressor.
Dust,
humidi$, and
flux due
to welding
which
inflows to
Cylinder
may cause
lockage
and noise.
4.2 PTC.STARTER
4-2-1 Composltlon
of PTC-Starter
(1)
PTC
(Positive
Temperature Coetficient)
is
a
no-contact
semiconduclor
starting
devioe
which
uses
ceramic
material and
this
materialconsists
of BaTiOs.
(2)
The
higher the temferature
is, the
highgr becomes
the
resistance
value. These
leatures are used
as starting
device
for
the Motor.
4-2-2
Role ot
PTG-Starter
(1)
PTC
is
attached
to
Hermetic Compressor
used
for
Refrigerator,
Show
Case and starls
Motor.
(2)
Compressor
for
household
refrigerator
applies to
single-phase
induction
Motor.
For
normal operation
of
the single'phase
induction
motor,
in the
starting
operation
flows
in both
main coil
and
sub-coil.
After
the starting
is over,
the current
in
subcoil
is cul off.
The
proper
features
of PTC
play
all
the
above
roles. So,
PTC
is used as a
molor starting
device.
4-2-3 PTC'Applied
Circuil Diagram
o
According
to Starting
Method for lhe Motor
4-2.4 Motor Restarting
and PTC Coollng
(1)
For restarting after
power
off
during normal
Compressor
Motor operalion,
plug
the
power
cord
afler
5
min. for
pressure
balance
ol
Refrigerating Cycle
and
PTC
cooling.
(2)
During
normal operation
of
the
Compressor Motor,
PTC
elemenls
generate
heat continuously.
Therefora,
if PTC isn't cooled
for a
while
after the
power
has
been
shut
otf,
Motor can't operate again.
4-2-5
Relatlon of PTG-Starter
and OLP
t
O,
fi
t
(1)
It
the
power
is off
during operation of Gompressor
and
the
power
is on before itre
pfC
is cooled,
(instant
shut-
O
,
otf
within
2
min. or reconnecl a
powor
plug
due lo
misconnecting), the
PTC isnt cooled and a
resistance
value
grows.
As a
result,
current
can't flow to the
sub-
coil
and the Motor
can't operale and the OLP operates
by
flowing over current in only
in the main-coil.
(2)
While
the
OLP repeats
on and off operation
about 3-5
times,
PTC
is cooled and Gompressor
Motor
performs
normal
operation.
tf OLP doesn't
operale
when PTC is not cooled,
Compressor
Motor
is worn away and causes circuit'
short and
fire. Therefore,
use a
properly
fixed
OLP
withoul fail.
4-2{
Note to Use
PTC-Starter
(1)
Be careful
not to
allow over-voltage and oJer-curront.
(2)
No
Strike
Don't apply
a
lorcible
power
or strike.
(3)
Keep aparl from
any
liquid.
lf
liquid
such.as
oil or
water away enter
the PTC,
PTC
materials it may break
due to
insulation breakdown
ol
the
material itself.
(4)
Don't change
PTC at
your
conv.enience.
Don't
disassemble
PTC and mold.
lf the exterior
to the
PTO-starter
is damaged,
resistance
value is altered
and
it
may
cause
poor
starting of the
compressor
motor
may
cause.
(5)
Use
a
properly
fixed
PTC.
er
COMPRESSOR
MOTOR
rl-
rCD"
Y]
pTC
STARTER
HEBMETIC
RSIR
TERMINAL
Flgure
16
-8-
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