Raytheon Beech Baron E55 - Page 470

RayHleon
Aircraft
Company
BARON
55
AND
58
SHOP
MANUAL
FLUSHING
THE
SYSTEM
I
It
is
necessary
that the
air
conditioning
system
be
flushed
and
evacuated
when
the
system
has
been
contaminated.
The
system
can
be
flushed
by
using
AC
Flush
(69,
Consumable
Materials
Chart,
Section
2)
as a
liquid
cleaning
agent
and
dry nitrogen
as a
vapor
propellant.
Flushing
of
the
system
may
be
accomplished
as
follows:
I
WP~RNING)
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.
I
The
air
conditioning
system
is
a
high
pressure
system,
Before
disconnecting
a
refrigerant
line,
the
system
must
be
discharged
with
a
recovery
servicing
unit,
Purge
the entire
system
to
a
125
micron
level.
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.
a.
Using
the service valves
in
the
fuselage
forward
of
the main
spar, slowly
discharge
the
system
with
the
recoveryi
recycle
servicing
unit
until
all
pressure
is
bled
off.
b.
Disconnect both
hose
connections
to
the
compressor.
NOTE
When
flushing
with AC
Flush,
do
not
allow
it
to enter
the
compressor.
c.
Remove
and discard
the filter-drier.
d.
Connect the
AC Flush
connector to
the
discharge
hose
connection
and
allow
approximately
one
pound
of
the
AC Flush
to enter
the
discharge
side
of
the
condenser.
e.
Connect
the
dry nitrogen
container
at
the
same
point
with
pressure
set
between
100 and
250
psig.
Allow
pressurized
vapor
to
enter
until all
flushing
liquid
is
purged
out
of
the
inlet
to
the
filter-drier
hose
connection.
f.
Cap
both
connections.
g.
Remove
the
expansion
valves
and
clean.
h.
Using
the above
procedure,
flush and
purge
the
liquid
hose
from
the
filter-drier
to
the
expansion
valves
and
suction
hose and
evaporator.
I
i. Evacuate the
system.
Refer
to
the
EVACUATING
THE
SYSTEM
procedure.
Jun
27/03Page
32
SECTION
10
Eza