Raytheon Beech Baron E55 - Air Conditioning System (TE-1119, TE-1125 and After;

RayCheon
nircraft
Company
BARON
55
AND
58
SHOP MANUAL
AIR
CONDITIONING
SYSTE~1
(TE-
I
1 1
9
TE-
1
125
AND
AFTER;
TH-873,
TH-895
AND
AFTER)
NOTE
On
serials
TE-1119,
TE-1125
and
After
and TH-873
thru TH-1744
the
refrigerant
used
on
the
original
installation
is R-12.
On serials TH-1745
and
After
the
refrigerant
used
is R-l
34a.
The
optional
air
conditioning
system
is
a
recirculating
air-cooling-refrigerant
system
controlled
by
two
switches
located
on
the
left
subpanel.
The
on/off air-conditioner
switch
engages
the
compressor
clutch circuit
and
the hi/lo
evaporator
blower
switch
controls
the
output
of
the
forward and
the aft
evaporator
blowers
(refer
to
Figure
5).
The
1
system
is
wired
through
the
landing
gear
downlimit switch
and
the left
landing
gear
safety
switch. If
the air
conditioning
is
in
operation
and
the
airplane
is
on
the
ground,
power
through
the
left
landing
gear
safety
switch
causes
the
condenser
air
scoop
to
fully
open.
At the
same
time,
power
through
the
landing
gear
downlimit
switch
causes
the
condenser
blower
to
operate.
With the
airplane
airborne and
the
landing
gear
retracted.
the
power
through
the
left
landing
gear
safety
switch
causes
the
air
scoop
to
partially
close
to
a
flight
position.
The
landing
gear
downlimit
switch
is
opened,
removing
any
power
from
the
condenser
blower
for
in-flight
conditions.
Two
pressure-sensing
switches and
a
high
pressure
relief
valve
protect
the
air
conditioning
system
from
operating
any
time the
pressure
within the air
conditioning
system
falls outside
the
normal
operating
range.
Both
pressure
sensing
switches
are
wired
to
a
common
5
ampere
fuse located
on
the
left
nacelle.
The
high
pressure
switch
and
relief valve
are
incorporated
into
the
system
to
protect
against
a
high
pressure
condition.
The
high
pressure
relief
valve is
located in
the
left nacelle
in
the
pressure
discharge
line
immediately
before
it
enters
the
condenser.
It
is
set to
bleed
off
excess
pressure
in
the event
pressure
exceeds
450
psi.
The
high
pressure
switch is located
in
the
left
nacelle
in
the
pressure
line
and is
set
to
activate
at
375
5
psj.
When
the
switch is
activated,
the
5
ampere
fuse
is
shorted
through
a
resistor
to
ground
and
power
is
removed
from
the
compressor
magnetic
clutch. The
high
pressure
switch
will
automatically
reset
when
the
pressure
drops
to
250 25
psi
but
further
operation
of
the
compressor
cannot
be
obtained until
the
cause
of
the
high
pressure
has
been
isolated
and
repaired
and the
5
ampere
fuse
has been
replaced.
The
low
pressure
switch
is
also located
in the
left
nacelie
and
is
installed
in
the
suction
line. This
switch is
designed
to
actuate
when
the
pressure
drops
to
7
1
psi.
When
this
switch
is
actuated,
the
5
ampere
fuse
common
to
both
I
high
and low
pressure
switches
is
again
shorted
through
a
resistor
to
ground
and
power
is
removed
from
the
compressor
magnetic
clutch. Further
operation
of
the
compressor
cannot
be obtained
until the
air
conditioning
has
I
been
serviced
or
repaired
and
the
5
ampere
fuse is
replaced.
E20
SECTION
10
JuPnaS2~:Page
21