Specifications

STARTING RELAY
The
starting relay
energizes
the
compressor
start winding.
When current
is
applied to the
compressor,
the magnetic
coil will raise
the relay
plunger
to
close
the
starting contacts,
thus
connecting
the
start
winding in
parallel
with the run
winding.
As the
compressor
motor
approaches
f
ull running
speed,
the
current
in the run
winding
and in the
relay
coil
decreases
and
the
plunger
drops out,
opening the
start winding
circuit. The
compressor
continues
to
operate
on the
run winding.
NOTE:
A replacement
relay
must
match
with the
compressor
windings.
lt is
important
to replace
a defective
starting
relay
with the
replacement
relay
specified
in
the
parts
manual.
and run
terminals
of the
compressor.
This
device is
connected
in
parallel
with
the
run
capacitor
and in
series with
the
compressor
start
windings.
This
will
produce
a short
circuit
across
the run
capacitor
during
the
compressor
starting
sequence,
and
full
current is
applied to
the
start winding
as
well
as
the
main
winding.
Since the
PTC
device
is temperature
sensitive,
a variance
in its temperature
causes
a change
in its
resistance.
When
current
is first
applied
to the
compressor,
the PTC
device's
low
resistance
shorts
out
the run
capacitor,
thus
producing
adequate
motor
starting torque.
As the
compressor
motor
approaches
running
speed,
the
current
through
the
PTC
device
causes the
temperature
and
resistance
of the PTC
device to increase
to
where
it
appears
to
be an
open circuit.
The
compressor
continues
to
operate
on
the run
winding
in
parallel
with the
series
combination
of the
run
capacitor
and
start
winding.
START
PTC
STARTING
DEVICE
&
RUN
CAPACITOR
OVERLOAD
PROTECTOR
,_
o
,[n
RUN
PTC
STARTING
DEVICE
OR
\
POWER
LEADS
The
PTC
solid
state
starting
push-on
component
mounted
+
CAPACITOR
LEADS
CHECKING
PTC
DEVICE
1.
Unplug
the line
cord.
2.
Discharge
the
capacitor.
3.
Remove
the
wires
from
the
pTC
device
terminals.
4.
Allow
the
PTC
device
to
cool to
room
temperature,
device is
a
to
the
start
4-17