Mooney M20R - System (R-134 A) Evacuation Procedure

MOONEY AIRCRAFT
CORPORATION
M20R SERVICE AND MAINTENANCE MANUAL
2.
Remove,
if
required,
any
enclosures
or
access
CAUTION
doors
to
expose
all
tubing,
hoses,
fittings,
etc.
to
the
Vent
system
~pressure
very
slowly
to
assure
that
compressor-condenser
module/evaporator
modul~.
compressor
oil
is
not
vented with the
nitrogen.
Do
not
let
air
enter
the
system.
3.
Verify
all aircraft and/or
ground
power
is
OFF1
16. Close manifold
valve.
4.
Remove
service
port
caps
from AIC
system.
Access
to
service
ports
is
through
Avionics
Bay
acess
parlel,
LH
2152-00 SYSTEM R-134a EVACUATION AND
side
of
Tailcone.
CHARGING
PROCEDURE
5. Close all
manifold
gauge
valves and
verify
hose
connections
are
tight.
Charging
the
refrigerant (R-134a)
system
is
required
on
new
system
installations,
after
an
accidental
line
break,
6. Connect R-134a
refrigerant
charging
manif0ld.
R-
component
failure
or
when
the
system
has excessive
1345
service
gauges
contain
quick-connect
to
leaks. Due
to
the chemical
nature
of the
refrigerant,
every
minimize
refrigerant
loss. To
install
q
push
precaution
must
be
taken
to
protect
the service
person
on
firmly
until
locked
(a
"clicking"
sound is
Hold
from accidental
exposure
to
the
refrigerant.
See service
grip
ring
and
pull
to
remove
quick-connect
fittings.j
precautions
in Section
21-59-00.
Only
R-134a
refrigerant
7. Connect
yellow
charging
hose
to
a
regulat$d
dry
must
be used
or
damage
to
the
system
will
result.
Over-
nitrogen
source,
charging
the
system
with
refrigerant
and/or oil will also
result in
system
damag
e
or
red uctio
n
in
performance
and
NOTE
service life.
An
adapter
is
required
to
connect
yellowcha~ing
nitroge
2152-01
SPECIAL
TOOLS AND/OR
EQUIPMENT
REQUIRED
8.
Regulate nitrogen
source
to
a
pressure
of
20~
PSIG
maximum.
The
following
tools
and
equipment
are
required
to
charge
the
refrigerant
system:
CAUTION
Do
not
exceed 200 PSIG
nitrogen
pressure
dgring
1.Small hand tools and socket
set
leak check
procedure
or
damage
to
expansion
2.
Vacuum
pump,
air
or
electric
(0-30
in,
hg.)
valve
WILL
resu~
3.
Refrigerant,
R-134a,
30 Ib.
cylinder
9.
Remove
all
shrouds,
panels,
flooring
and
and
other
4. R-134a
charging
manifold,
with
gauges
and
hoses
covering
which
prevents
access
to
refrigerant
fitti/lgs
or
connections
(if required).
5.
Thermometer,
0-1500
F
10.
Verify
all
plumbing
connections
are secure.
6.
Inspection
mirror,
adjustable
11.
Slowly
open
high
pressure
(RED)
manifoldi
valve
7. Service
light
or
flashlight
and allow
system
pressure
to
increase
gradually
~ntil
a
8. Hand and
eye
protection
pressure
of
200
PSIG is
achieved.
Allow time for
s’ystem
pressure
to
equalize
across
expansion
valves
an61
note
9.
Shop
towels
final
system
pressure.
10.
Refrigerant
oil
(Ester RL-500S))
CAUTION
11.
Scale,
0-501bs.
During
this
procedure
protective
eye
wear
dnd 12.
Reclaim/recycle
cart
(R-134a)
gloves
should be
worn
to
prevent
operatorin5ury.
15. Hose
adapter (1/2
in. male Acme
to
1/4 female
Rare)
12.
Apply
soapy
leak check
fluid
to
each
connec~ion
to
2152-02 -SYSTEM
(R-134a)
EVACUATION
locate
leaks.
PROCEDURE
CAUTION
Do
not
use
any
leak
dye
in R-134a
system
ior
Prior
to
charging
the
system
with
refrigerant,
the
system
damage
to
system
may
result,
must
be evacuated for
a
minimum
of
45
minutes
to
re-
13.
Use
thread sealant
on
all male
fitting
threads;(spar-
move
air and moisture
which
can cause
the
system
to
perform
incorrectly
if
not
completely
removed from
sys-
ingly), staying
off the first
two
(2)
threads
near
s/ealing
tem.
surface.
A
light coating
of R-134a
refrigerant
oil
mClst
be
1.
Verify
power
to
system
is
OFF.
applied
to
flare
and/or
o-ring
to
prevent
metal
galling/o-
ring damage.
2. If
mo
u
ired,
perform
leak check
proced
ure
described
in Section 21-51-02.
NOTE
3. Connect
charging
manifold
to
service
ports
(ref.
Do
not
apply
oil
to
fitting
threads.
Section
21-51-02,
4
through
6.
14.
Tighten joints
as
necessary
to
stop
leaks.
4. Connect
manifold
charging (yellow)
hose
to
vacuum
pump
and
turn
pump
ON.
CAUTION
Do
not
over
tighten
piumbing
connection4.
NOTE
Stripped
threads
or
cracked flares
may
resilt.
An
adapter
may
be
required
to
allow
vacuum
pump
hookup.
15. V~th
system
leak
tight,
turn
nitrogen
sourc8
OFF;
disconnect
yellow charging
hose from
nitrogen
source
5.
Open
both valves
on
charging
hose,
quick
connect
and
slowly
release
nitrogen
pressure
to
zero,
fittings.
21-52-00
REV. 7-96
Island Enterprises