4-1 COMPRESSOR
4-1-1 Role
The compressor inhales low temp. and low pressure gas
evaporated from Evaporator of the Refrigerator, and
condenses this gas to high temp. and high pressure gas,
and then plays delivering role to Condenser.
4-1-2 Composition
The Compressor is Composed of Compressor Apparatus
compressing gas, Compressor Motor moving Compressor
Apparatus and Case protecting Compressor Apparatus
and Motor.
There are PTC-Starter, and Over Load Protector in the
Compressor outside. On the other hand, because the
Compressor consists of 1/1000mm processing precision
components and is sealed after producing without dust or
humidity, deal and repair with care.
4-1-3 Note to Use
1. Be careful not to allow over voltage and over current.
2. No Strike
If applying forcible power or strike (dropping or careless
dealing), poor operation and noise may occur.
3. Use proper electric components appropriate to the
Compressor.
4. Note to Keep Compressor.
If Compressor gets wet in the rain and rust in the pin of
Hermetic Terminal, poor operation and poor contact may
cause.
5. Be careful that dust, humidity, and flux due to welding
don't inflow in Compressor inside in replacing
Compressor. Dust, humidity, and flux due to welding
which inflows to Cylinder may cause lock and noise.
4-2 PTC-STARTER
4-2-1 Composition of PTC-Starter
1. PTC (Positive Temperature Coefficient) is no-contact
semiconductor starting device which uses ceramic
material and the material consists of BaTiO
3
.
2. The higher the temperature is, the higher resistance
value becomes . These features are used as starting
device of Motor.
4-2-2 Role of PTC-Starter
1. PTC is attached to Hermetic Compressor used for
Refrigerator, show case and starts Motor.
2. Compressor for household refrigerator applies single
phase induction Motor.
For normal operation of single-phase induction motor, in
the starting operation flows in both main coil and sub
coil. After the starting is over, the current is cut off in sub
coil. The proper features of PTC play the above all roles.
So, PTC is used as a starting device of motor.
4-2-3 PTC-Applied Circuit Diagram
According to Starting Method of Motor
4-2-4 Motor Restarting and PTC Cooling
1. For restarting after power off during normal Compressor
Motor operation, plug the power cord after 5 min. for
pressure balance of Refrigerating Cycle and PTC
cooling.
2. During normal operation of Compressor Motor, PTC
elements generate heat continuously. Therefore,
if PTC isn't cooled for a while after power off, Motor can't
operate again.
4-2-5 Relation of PTC-Starter and OLP
1. If power off during operation of Compressor and power
on before PTC is cooled, (instant shut-off within 2 min.
or reconnect a power plug due to misconnecting),
PTC isn't cooled and a resistance value grows. As a
result, current can't flow to the sub-coil and Motor can't
operate and OLP operates by flowing over current in
only main-coil.
2. While the OLP repeats on and off operation about 3-5
times, PTC is cooled and Compressor Motor performs
normal operation.
If OLP doesn't operate when PTC is not cooled,
Compressor Motor is worn away and causes circuit-
short and fire. Therefore, use a proper fixed OLP without
fail.
4-2-6 Note to Use PTC-Starter
1. Be careful to over voltage and over current.
2. No Strike
Don't apply a forcible power or strike.
3. Keep apart from any liquid.
If liquid such as oil or water inflows into PTC,
PTC materials may break due to insulation breakdown
of material itself.
4. Don't change PTC at your convenience.
Don't disassemble PTC and mold. If damaging to
outside of PTC-Starter, resistance value alters and poor
starting of compressor motor may cause.
5. Use a properly fixed PTC.
OVERLOAD PROTECTOR
-
PTC
-
5
-
6
-
C
-
S
-
M
-
S
-
M
-
MOTOR
-
HERMETIC
-
TERMINAL
-
PTC STARTER
-
RSIR
-
COMPRESSOR
-
3
-
Figure 18
4. ADJUSTMENT
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