Datsun C210 series Manual page 482

connection
6
Also
use care
not to give
scratches
to
the
seating surface
at connections
A
small scratch
on
the
seating
surface
may
be the
cause
of gas
leakage
Before
connecting pipes
be
sure
to
give coating of compressor
oil to
the
seating
surfaces
SAFETY
PRECAUTIONS
WARNING
1
Since
direct
contact
of the
liquid
refrigerant with
your skin will
cause
frostbite
always
be careful
when
handling
the
refrigerant
Wear
gloves
or wrap a
piece
of
cloth around service
valve
to
protect
your
fingers against
frostbite
by refrigerant
If any of
the refrigerant should
get
into
your eyes when
charging
the
refrigerant splash
your eyes
with cool
water to
raise the
temperature
gradually Apply
a
protective
film
to
the eye
to
avoid infection Do
not
rub your
eyes
Consult
an
eye
specialist
AIMys
WIIr
goggles
or
glasses to
protect
your eyes when
working
around the
system
Should
re
frigerant
strike
your
body
splash
on
cool
WirIer
and
apply
a
protective
film
2 The
refrigerant
service container
has
a
safe strength
However if
handled
incorrectly
it will
ex
plode
Therefore always
follow
the instructions
on
the label In
particular never
store
it in
a
hot
location
above
520C
1260F
or drop
it from
a
high height
3 The
refrigerant
gas
is odorless
and colorless and
breathing
may
become difficult due
to
the lack
of oxygen Since the
refrigerant
gas is heavier than air and
will
lay close
to the
floor
be espe
cially
careful when
handling
it in
small
confined
spaces
Air
Conditioning
4 The
refrigerant
itself
is nonflam
mable However
a
toxic
gas
phosgene
gas is
produced
when
it
contacts
fire and
special
care
is
therefore
required
when
check
ing
for leaks in the
system
with
a
halide torch
5 Do
not steam
clean
on
the sys
tem especially condenser
sinea
excessively high
pressure
will
build up in the
system resulting
in
explosion
of the
system
The above
precautions
are essen
tial in
handling
of
Refrigerant
12 and their strict observation
requires sufficient
training
Therefore it is of first
impor
tance
that any other
personnel
than
a
well trained serviceman
should
not
be allowed
to
handle
the refrigerant
EVACUATING AND
CHARGING SYSTEM
During servicing
use
caution to
keep
air from
getting
into
refrigerant
When
air enters
the system all
refriger
ant must
be evacuated from system
prior
to charging
new
refrigerant
Air
in
refrigerant
has the
following
delete
rious
effects
I Since
the condensation
tempera
ture
ofthe
air is
extremely
low the
air
will
not
be condensed when
refrigerant
Low
pressure gauee
Compound
pressure gauge
8ack seat e d
Full
counter
c1ock wise
To
low sJde
service
vaive
AC ll
gas
is condensed in
the condenser and
the
air will thus remain
in gaseous
form
Consequently
the effective
thennal transmission
area
of condenser
for
refrigerant
gas will be reduced
and
refrigerant gas to
be
condensed
will be
reduced The pressure rise
will
become
proportional to
the volume of the air
in
system
2
When
air
and
refrigerant
are
mixed
in system
a
chemical
reaction
will be
produced
and
hydrochloric
acid which will
adver ely
affect the
aluminum
copper
iron and other
materials
in
system may
be
generated
HANDLING
MANIFOLD
GAUGE
The
pressure at
the
high
and low
sides of system should
be
measured
when evacuating and charging
refrig
erant and when
diagnosing
trouble in
the
system
The manifold gauge is
used
for these
purposes
A
manifold
gauge
has
two pressure gauges
a
low pressure
gauge
and
a
high
pressure gauge
These
gauges
are
connected
to
the
high
and
low side
service
valves of
system
through
flexible
charging
hoses The
construction
of manifold
gauge
is
shown in
Fig AC I I
When valve stem is
fUlly
screwed
the
valve
is
front seat e d
and valve
path
and the center
path
are
blocked When
valve stem is
backed off the paths
are
opened
High
preuure gauge
To
hi g h lide
service
v
l
e
l
AC243
Fig
AC ll
Mahifold
Gauge