Piper Cherokee Six - Page 692

PIPER
CHEROKEE
SIX SERVICE
MANUAL
13-17.
ADDITION
OF
PARTIAL
CHARGE
TO
SYSTEM.
It is
possible
to
top off
this
system
with
refrigerant
by
the
following
method.
a.
Remove
the
access
panel
at
the
rear
of
the
cabin.
b.
Connect
a charging
hose
to a
refrigerant
cylinder
and
also
to
the
Schrader
valve
fitting
on
the
suction
line.
(Refer
to Figure
13-8.)
c.
Purge
the
charging
hose
by
allowing
a small
amount
of refrigerant
gas
to
escape
at
the
Schrader
valve
fitting.
d.
Start
the
engine
and
operate
at
1000
RPM
and
turn
the air
conditioner
on
maximum
cool.
e.
Remove
the
plastic
plug
from
the
sight
glass
in
the
top
of
the
receiver-dehydrator.
f.
With
a
low
refrigerant
charge
in
the
system,
bubbles
will
be
seen
passing
thru
the
sight.glass
when
the
system
is operating.
g.
Open
the
valve
on
the
refrigerant
cylinder.
h.
Allow
refrigerant
to
flow
into
the
system
until
the
bubbles
disappear
from
the
sight
glass.
i.
Close
the
refrigerant
valve
and
check
to
see
that
the
sight
glass
remains
clear
during
system
operation.
j.
When
the
sight
glass
stays
clear
of
bubbles,
add
an
additional
1/4
pound
of
refrigerant
to
the
system.
(Engine
should
be operating
at
1000
RPM.)
NOTE
This
should
be
done
with
OAT
at 70
°
F.
or
higher,
with
the
air
conditioner
operating.
k.
Shut
off
the
air
conditioner
and
engine.
Remove
the
charging
hose
from
the
Schrader
valve
with
care
due
to
refrigerant
remaining
in
the
line.
1.
Replace
the
access
panels.
13-18.
COMPRESSOR
SERVICE.
It
is
not
advisable
to
service
the
compressor
in
the
field
It
should
be
done
by
a qualified
shop
which
has
the
special
equipment
and
trained
personnel
required
to properly
service
the
unit.
Maintenance
to
this
unit
and
its
related
components
is limited
to
the
replacement
of
worn
drive
belt
and
magnetic
clutch.
Any
other
service
requires
removal
of
the
compressor
from
the system.
NOTE
An
important
factor
in
air
conditioning
servicing
is
cleanliness
and
care
should
be
exercised
to
prevent
dirt
or
foreign
material
from
entering
the
system.
Al
hose
and
tubing
ends
should
be
capped
immediately.
Any
lubrication
required
in
the
assembly
of
the
components
should
be
refrigerant
oil
of
the type
used
in
the
compressor.
ACCESSORIES AND UTILITIES
Issued:
8/17/72
3H2