Specifications

4. The meter should read between 42K
and 63K ohms.
The resistance is not
critical. As long as there is continuity
between
Terminals No. 2
and
3 the
def rost
heater is in operative
condition.
lf there
is no resistance reading
(open
circuit) the
defrost heater and
thermostat
must be checked individually. NOTE:
When
using
the meter
avoid
touching the
probes
since this could result in a false
reading
and misdiagnosis.
To test
the defrost heater and thermostat
when
the evaporator temperature is
*
15o
F
or below
proceed
as
follows:
1. Disconnect the
unit f
rom
power
source
and
plug
it into
a
wattmeter.
Plug wattmeter into
power
source and
manually advance the defrost timer to
the
defrost cycle. See the def
rost
timer
section for information
on
manually
advancing the timer.
The
wattmeter should read 550 to 600
watts
depending on
the
model
(total
wattage
of the divider heater, timer
motor
and defrost heater). Should the
reading
be 0
to 4.5
watts
the defrost
heater
or thermostat is
defective.
To
f urther isolate the defective
part
proceed
to Step 4.
Disconnect
unit
from wattmeter.
Follow
Steps 2,
3 and
4
of
testing
the
heater and thermostat when
the
evaporator temperature
is
above
+
150
F or higher.
6. lf the meter reads
between 42K and
63K ohms, the
defrost
thermostat
is
defective.
To use an
ohmmeter set
the meter
to R x
1K scale. lf the reading
is approximately
20 to 23 ohms, the
defrost
heater
and
thermostat
are operative.
REPLACING RADIANT
DEFROST
HEATER
To reach the
heater for replacement, it is
necessary to remove the following items:
1. Disconnect
the unit from
power
source.
2. Remove the
freezer shelves and the
lreezer
basket.
3. Remove ice tray rack, if
used. On
models with an ice maker, it must
be
removed.
4.
5.
2.
4-31
TIMER
YEL
AT
,WH
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