Specifications

5.
Remove
the
PTC
device
from
the
compressor.
6.
Using
an ohmmeter,
check
the
resistance
between
the
PTC
device
terminals.
The ohmmeter
should
register
between
3 and
20 ohms.
An extreme
variance
from
between
3
and
20 ohms
indicates
a defective
PTC d'evice
which
must be
replaced.
NOTE:
WE DISCOURAGE
USING
A
VOLTMETER
TO
CHECK
THE
PERFORMANCE
OF
THE PTC
DEVICE
BECAUSE
THE TEST
RESULTS
ARE
INFLUENCED
BY
SEVERAL
FACTORS,
SUCH
AS
ITS DEPENDENCE
ON
THE LINE
VOLTAGE
TO
THE COMPRESSOR,
THE
RESPONSE
CHARACTERISTIC
OF
THE
VOLTMETER
AND THE
PTC
DEVICE
TEMPERATURE
AT
THE
TIME THE
COMPRESSOR
IS ENERGIZED.
REPLACING
PTC
DEVICE
1. Unplug
the
line cord.
2. Disconnect
the PTC device
from the
compressor
terminals.
3. Remove
the
lead wires
from
the PTC
device
terminals.
4.
Replace
the device and
reconnect
the
wires
to the
proper
terminals.
RUN
CAPACITOR
The run capacitor
is mounted adjacent
to
the compressor.
lt is electrically
connected
between
the run and
start
windings
and
in
parallel
with
the PTC
device.
The capacitor
is connected
to the
compressor
circuit
to
provide
the required
phase
difference
between
the start
and
run
windings
for running
the compressor.
CAPACITOR
FAILURES
Failure
of the capacitor
may
be caused
by
(1)
a short
circuit,
(2)
open
circuit,
(3)
a
capacitor
that is low
in capacitance.
A short
circuit
will cause
the start
windings
to be energized
in the start
mode
all
the time.
The compressor
could
start
but
the overload
protector
would
eventually
trip, and
sooner
or
later, trip
continuously.
An open
circuit
should,
under
normal
conditions,
allow
the compressor
to
start.
Under
a
heavy
running
load, however,
the
compressor
will
usually
trip
on
the
overload.
A capacitor
may
lose capacitance
by
a
loss of
its electrolytic
properties.
The
compressor
would
run under
a
light
load,
but
would trip,on
the
overload
in
high
ambient
conditions.
TESTING CAPACITOR
CAUTION:
DISCHARGE
A CAPACITOR
BEFORE
HANDLING.
SHORT
ACROSS
/TS
TERMINALS,
US/NG
A RES/STOR
WITH A
MINIMUM
RES/STANCE
OF
lOOO OHMS,
We
recommend
using
a
caPacitor
analyzer
when
testing.
Preferably
a solid
state
unit
that measures
capacitance
and
power
factor
of any capacitor,
and
has an
automatic
means of
discharging
the
capacitor
through
resistance.
4-18