Specifications

3. Remove
the
defrost
thermostat and
mounting
clip.
This is
done by squeezing
"in"
on
clip and
pulling
up to disengage.
4. Install the defrost thermostat
in the reverse order of removal.
NOTE: When
reinstalling, make sure
you
snap thermostat back into
position
with wires
facing
back
of refrigerator.
Route wires between the liquid
and suction
lines
on evaporator
before connecting.
DEFROST HEATER AND
THERMOSTAT
Side-By-Side Models
Two radiant heaters
are used
to remove
accumulated f rost f rom the treezer
evaporator
and drain
trough
during a
defrost cycle. These heaters
are
wired in
series, thus comprising the
defrost
heater
system.
The
defrost
timer
energizes
the
defrost
heater every eight hours of accumulated
compressor run time.
When the
temperature in the
thermostat area
reaches approximately
+
40o F the
thermostat contacts open the circuit to the
defrost heater.
Each defrost heater is a spiral wound
resistance wire enclosed in
a
heat
resistant
glass
tube.
One
is mounted in the
middle
of
the evaporator
behind an
aluminum shield. The
other
is mounted
just
below the evaporator.
An
ohmmeter check will determine if all
phases
of the defrost cycle are functioning
properly.
The defrost thermostat contacts
open at approximately
*
40" F and close
at approximately
+
150 F.
The
defrost
thermostat
has either a 47K
or
56K ohms
resistor
connected internally
across
the two terminals. The resistor
permits
checking the
defrost heater even
when the
evaporator
temperature is
*
150
F
or
higher.
An ohmmeter can be
used
to test
the
defrost heater and thermostat without
disassembling the treezer compartment
even if the
evaporator temperature is
+15o
F
or
higher. To
check
proceed
as
follows:
1. Disconnect the
unit from
power
source.
2. Disconnect
the
plug
from the
defrost
timer.
3.
Set
the
ohmmeter to
the R
x 1K scale
and connect the
probes
to the No. 2
and No.
3
terminals
of
the
disconnect
plug.
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