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Panasonic NN-8508 - Page 12

Panasonic NN-8508
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NN-8508,
NN-8558
NN-8808,
NN-8858
NN-8808P.
5.
Baking
and
Broiling
Control
FLAT
HEATER
In
this
concept
two
(2)
flat
heaters
are
used.
Located
one
on
top
and
one
on
bottom
of
oven
cavity,
they
operate
alternately
to
provide
the
necessary
heat.
The
heater
consists
of
flat
heater
wire
insulated
be-
tween
two
mica
plates
similar
to
that
of
a
toaster.
The
digital
programmer
circuit
controls
the
alternating
ON-OFF
time
of
upper
and
lower
heater
in
order
to
control
the
oven
cavity
tempera-
ture,
see
fig.
10A
and
11.
:
(A)
After
the
start
pad
is
tapped
with
the
desired
bake
or
broil
program-
me
selected,
an
18V
DC
signal
comes
out
of
the
digital
programmer
circuit
and
is
applied
to
the
coil
of
power
relay
C
and
D
alternately.
(B)
When
power
relay
C
energizes,
power
source
voltage
(120V
AC)
is
applied
to
the
upper
heater
and
oven
temperature
starts
increasing.
(C)
When
the
power
relay
C
is
deenergized,
upper
heater
turns
off
and
when
power
relay
D
is
energized,
the
lower
heater
tums
on.
In
this
way,
the
upper
and
lower
heater
tum
on
alternately
until
the
selected
oven
temperature
is
obtained.
(D)
When
the
oven
reaches
the
selected
temperature,
the
digital
prog-
rammer
circuit
senses
the
temperature
through
oven
temp
sensor
and
stops
supplying
18V
DC
signal
to
the
power
relays
C
and
D
resulting
in
turn
off
of
upper
and
lower
heaters.
After
the
heaters
have
been
turned
off,
the
oven
temperature
will
continue
to
increase
a
while
then
decrease
as
shown
in
Fig.
11.
(E)
When
the
oven
temperature
drops
below
selected
temperature,
the
digital
programmer
circuit
senses
the
oven
temperature
and
starts
supplying
18V
DC
to
the
coils
of
power
relays
C
and
D
alternately
again.
NOTE
1:
ON-OFF
time
of
upper
heater
and
lower
heater
vary
depending
on
the
selected
oven
temperature
as
shown
in
Fig.
10A.
When
baking
Is
selected
with
temperature
setting
of
200-450°F,
off
period
of
both
heaters
is
also
programmed
while
oven
temper-
ature
is
lower
than
selected
temperature,
as
shown
in
Fig.
10A
and
11.
NOTE
2:
When
Broil
cooking
feature
is
selected,
oven
temperature
is
determined
automatically
as
shown
in
Fig.
10B.
Baking
and
Broiling
START
OVEN
TEMP
OVEN
TEMP
UPPER
HEATER
(POWER
RELAY
C)
LOWER
HEATER
(POWER
RELAY
D)
NOTE
3:
ON-OFF
time
of
upper
heater
and
lower
heater
vary
depending
on
the
selected
oven
temperature.
(See
Fig.
11A.)
ie
SELECTED
OVEN
TEMP
Heater
ON-OFF
Time
for
Preheat,
Baking,
Broiling
ON
TIME
OF
|
ONTIMEOF
|
OFF
TIME
OF
UPPER
HEATER
}
LOWER
HEATER)
BOTH
HEATERS
renee]
|
ries
05
Broiling
Temperature
:
CATEGORY
OVEN
TEMP
.
Fig.
108
MAINTAINED
OVEN
TEMP.
NOTE
4:
TU
----
ON
time
of
upper
heater
TL
----
ON
time
of
lower
heater
TF
----
OFF
time
of
both
heaters
Fig.
11

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