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MONOGRAM
REFRIGERATORS
DEFROST
SYSTEM
Frost
that
has
collected
on
the evaporator
is
automatically
defrosted
by
an
electrical
heater.
After
10
hours of accumulated
compressor operation time, the
defrost
control opens the
circuit
to
the
compres~or
and
closes the
circuit
to
the
defrost
heater,
drain trough
heater
(and
on
later
models), the
fill
tube heater
for
35
minutes.
The
defrost
heater
(rated
350
watts)
and
the drain trough
heater
(rated
40
watts) remain energized
until
the
temperature
of
the evaporator
rises
to
45
0
F (approximately
10
minutes).
The
defrost
thermostat then opens the
circuit
to
the
heaters.
During the remaining time
allotted
for
the
defrost
interval,
water
is
permitted
to
drain
from
the evaporator into
the drain trough
below
the evaporator.
At
the
end
of the 35-minute
defrost
interval,
the
defrost
control opens the
contacts
for
the
defrost
circuit
and
closes the contacts
to the compressor
circuit.
After the compressor resumes
operation,
the
defrost
thermostat will
be
cooled
by
the
evaporator.
When
the evaporator
temperature drops
to
25
0
F,
the thermostat
contacts will close in preparation
for
the
next
defrost
cycle.
Defrost Control
The
defrost
control
is
located
at
the
front
of the
unit
compartment, behind the top
panel.
The
control
is
mounted
to
a
sound
baffle
which
is
attached to the
front
of
the
slide-out-chassis.
For
access
to
the
defrost
control,
the top panel
must
be
removed.
To
remove
the
defrost
control,
remove
two
screws holding the control to the
baffle,
rotate
the control out
and
disconnect the
harness connector .
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13
-
ZIS
MODELS
1:"±1
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DEFROST