Adjustment; Compressor; Ptc-Starter - Kenmore 4666812 Service Manual

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
r l -
rCD"
Y]
pTC STARTER
HEBMETIC
RSIR
TERMINAL
Flgure 16
- 8 -