SectionVll
Systems Description
·
BEEOHCRÄFT
·
..
D\tfb~C33
Bonitnza,E33.ana-F33
On
the
C33 and E33. fresh
ram
air is picked up
through
an
intake on the rear engine baffle, passes
through
the heater
muffler. then
into
a
mixer
valve on the
forward
side of
the
firewall.
In
the
mixer
valve,
the
heated air is combined
with
a controlled qu&ntity
of
unheated
ram
air
which
enters
an
intake
on
the
right
side
of
the nose.
Air
of the desired
temperature is
·
then
ducted
from
the
mixer
valve .to
the
outlets in
the
cabin.
On the F33, fresh ram air enters an intake on
the
right
side
of the nose. passes
through
the heater
muffler,
then
into
a
mixer
valve on
the
forward
side 'of the
firewall.
In
the
mixe-r
\lalve,
the
heated air is combined
with
a controlleä
quantity
of unheated ram air picked
up
at
an intake at
the
re'ar
engine baffle. Air
of
the
desired
temperature
is
then
·
ducted
from
tHe
mixer valve to
the
outiets in the cabin.
HEATER AND DEFROSTER OPERATION
The cabin heat control is located
on
the upper
right
sub-
panel
in
the
C33 and E33 models and on
the
lower
left
subpanel
in
the
F33.
To
provide heated
air
to
the
cabin out-
lets,
pull
the CABIN HEAT control. The control regulates
the
amount
of cold air
that
is mixed
with
the
air
from
the
heater muff.
When
the control· .is·pulled
fully
out,
the
cold
air is
shut
off
and only heated air enters
the
cabin.
'
To
deliver heated
air
to
the
aft
seat outlets,
either
push
(C33, E33) or pul! (F33)
the
AFT CABIN HEAT
control
..
For
maximum
heat,
the
control is moved to
fuli
open position.
To
obtain heated air
for
defrosting
the
windshield
pul!
the
pEFryR?TcontrpLout.,lt,i;na-r:;
b,I(!
:r;i!",Ce~?ary.tQ
l(aw;0r,close
the A'F't CABIN HEAT control
to
obtain
maximum
air
flow
for defrosting.
To
close
off
all air from the heater system,
pul! the red control located at
the
extreme !eft
of
the
pilots'
lower subpanel. lt is placarded
either
VENT SHUTOFF
(C33, E33) or FIREWALL AIR {F33).
7-34
August
1982
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