Raytheon Beech Baron E55 - Page 461

Rslytheon
Airt~raft
Company
BARON
55
AND
58
SHOP
MANUAL
PRECA
UTIONAR
Y
SER
VICE
R/IEASURES
IWARNlnG
WARNING
Due to
the
air
quality
control
regulations
enacted in the United
States,
R-12
and
R-134a
refrigerant
cannot
be
vented
into
the
atmosphere,
When
performing
maintenance
on
the
air
conditioning
system
where
R-12
or
R-134a
can
escape
from the
system,
evacuate
the
system
with
a
recovery
or
recycle
servicing
unit
that will
salvage
the
refrigerant,
A
face
shield should
be
worn
when
performing
maintenance
on
the
lines
because
refrigerant
coming
in
contact
with
the
eyes
can
cause
loss of
sight.
Do
not
smoke
when
servicing
the
system
with
R-12
or
R-134a because
it
converts
to
a
highly
toxic
gas
when
exposed
to
an
open
flame.
Before
any
service is
attempted
which
requires
opening
of
refrigeration plumbing
or
units,
the
person
doing
the
work
should
be
thoroughly
familiar
with
instructions
on
servicing
the
system.
These instructions
should
be
followed
very
carefully
when
performing
the
tasks that
will maintain this
system
in
a
proper
functioning
order.
The
major
n~asons
for
these
measures are
for
safety
and
to
prevent
dirt
and
moisture
from
entering
the
system.
Dirt
contaminants
may
cause
leaky
valves
or wear
in
the
compressor.
Moisture
may
not
only
freeze
into ice
at
expansion
valves,
but
can
also
cause
the formation of
hydrochloric
or
hydrofluoric
acids in the
system.
All
subassemblies
are
shipped
sealed
and
dehydrated.
They
are
to
remain
sealed
until
just
prior
to
making
connections.
They
should
be
at
room
temperature
before
uncapping.
(This prevents
condensation
of
moisture
from
the
air
that
enters
the
system.)
If for
any
reason
caps
are
removed,
but
the
connections
are
not
made,
then
the
tubes and other
parts
should
not
remain
unsealed
for
more
than
15
minutes. If
the
time
period
is
longer,
reseal
the
connections.
All
precautions
should be
taken
to
prevent
damage
to
fittings
or
components.
Even
minute
damage
to
a
connection
could
cause
it
to
leak.
Any fitting getting
grease
or
dirt
on
them should be
wiped
clean
with
a
cloth
dampened
with
alcohol.
Do
not
use
chlorinated
solvents such
as
trichlorethylene
for
a
cleaning
agent,
for
they
are a contaminant.
If
dirt,
grease
or
moisture
gets
inside
pipes
and
cannot
be
removed,
the
pipe
will
have
to
be
replaced.
Use
a
small
amount
of
clean
refrigerant
oil
on
all tube
joints
and
dip
the
O-ring
in
this
oil
before
assembling
the
joint
to
help
ensure
a
leak-proof
joint.
Use oil
(35,
Consumable Materials
Chart,
Section
2)
for
this
purpose
on
airplanes
TH-1
thru
TH-1744.
RL 100S oil
(67,
Consumable Materials
Chart,
Section
2)
is used
on
airplanes
TH-1745
and
After.
NOTE
The
receiver-dryer
is the last
assembly
to
be
connected.
This is
necessary
to
ensure
maximum
moisture
protection
of
the
refrigeration
system.
a.
This
is
a
high
pressure
system.
When
disconnecting
a
refrigerant
line,
the
system
must
be
discharged
with
a
recovery
or
recycle
servicing
unit.
b.
Whenever
a
refrigerant
line
is
disconnected,
purge
the entire
system
with
a
vacuum
pump
operating
at
the
125
micron
level.
E20
SECTION 10Page
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