15
2-4 Motor restarting and PTC cooling.
(1) To restart normal operation after a
power interruption, wait 5 minutes
to let the pressure equalize and
the PTC to cool.
(2) During normal operation, the PTC
generates heat. If it has not had
time to cool after a power
interruption, the motor will not
restart until the PTC cools.
2-5 PTC OLP Relation
(3) If power is cut off during
compressor operation and then
restored before the PTC has
cooled down, it's resistance value
increases. As a result, the current
cannot flow to the auxiliary
winding and the motor cannot start
and the OLP operates due to the
current overflow through the main
winding.
(3) While the OLP repeats the
ON/OFF operation 3~5 times, the
PTC cools and the compressor
operates normally. If the OLP
does not operate when the PTC is
hot, the compressor motor will
overheat, causing a short circuit or
possibly a fire. Therefore, use a
fail-safe OLP.
2-6 Note on using the starting PTC
(1) Be careful not to cause an
overvoltage or short circuit.
(2) Do not force or bump it.
(3) Keep the OLP dry. If water or oil
gets into the OLP, the electrical
insulation can degrade and fail.
(4) Do not replace the PTC at your
own convenience. Do not
disassemble the PTC. If the PTC's
exterior is damaged, the
resistance value changes and
may cause failure during the
stating of the compressor's motor.
Use a PTC in good condition.
3- OLP
3-1 OLP Definition
(5) The OLP is a bimetallic, heat-
sensitive switch attached to the
compressor. Its function is to
protect the motor in the event of
overheating.
(6) When an overvoltage flows to the
motor, the bimetal reacts by
heating and activating (opening)
the OLP.
3-2 OLP Function
(7) Prevents the starting to the motor
winding.
(8) Do not turn the adjustment screw
during normal OLP operation.
(OLP connection diagram)
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