Kenmore 4666812 - Air Recharging in Compressor

SERVICING
PRECAUTIONS
|arn
necnaRGrNG rN
coMPREssoR
./Test
the
relrigeration
syslem
connecting
it electrically
before
refilling
operalion.
ll is necessary
to ascertain
the function
of th€ motor-compressor
and
identily
the
defects
immedialely, ll
defects have
been found,
empty the
old
syslom
of
possiue
R-l34a residue
by breaking
off
the end
of
lhe
exlenslon
piece
at its narrow
point.
(Figure
1)
Replace
lhe
filter
and
any
damaged
components.
Unsolder
and
pull
olf
lhe
piece
remaining
inside
the service tube
and
lhen
allach an complete
extension with
male Hansen
and
tl
laal,
solder
it to the same
tube
again.
(Figure
2)
ll ls necessary
lo €xecute
the
soldering
operation
with
valve
open
so lhal the fumes
caused
by
oil
residue
can
como
oul
freely wilhoul
blowholes
between
two
tubes
durlng the
heating
the of lhe
point
to
be soldered.
The extension litted
with the
male Hansen
is
connected
to
lhc
female
litting of
the
vacuum pump
tube.
(Figure
3)
Air evacuating
from
the sysiem
begins
as soon as
lhe
pump
starls. The refrigeration
system must
be kept
under
vacuum
until lhe reading
on the
low-pressure gauge
indicales
vacuum
(0
absolute,
-1
atm.,
.760
mm hg)
in
any
case it is advisable
to keep
the
pump
running
for
about
30
minutes.
(Figure
3)
In case
that a considerable leakage
occurs
it will
be
necessary
to stop the vacuum
pump
and to add
asmall
quantity
of
Freon
to the system,.if
vacuum
should not
be
obtained
(pressure
gauge
can't fall
to
1
atmosphere),
start
the refrigeration
unit and find
the leakage with
the
special
leak-finder.
When the
delective
soldering
point
is visible,
re-do
it
after opening the extension
tube valve
and
reestablishing
the
normal
outside
pressure
inside
the
group.
Because
the melted allgy is
sucked into
the tubes and
block them, the
pressure
must
be rebalanced
when
vacuum
is in
the system in
soldering. As
soon as the
TO THE
R-134A
CYLINDER
TO THE
REFRIGERATION
SYSTEM
Flgure 4
Iaclum
operation
is
over,
add
the
quantity
in
grams
of
R-134a
to
the refrigeration
system.
RemehOei
that
every
system
has
an
exact
quantity
of R-134a
with
a tolerance
of
t5
grams
that
can be added.
(Figure
4)
Before
performing
this operation
(if
the vacuum
pump
and
refilling
cylinder
are connected),
make
sure
that'the ialve
placed
between
the vacuum
pump
and
the refilling
tube are
closed
in order
to keep
the Freon
for
addition
to
tFe system.
(Figure
5)
In
addition,
check
the
graduated
scale
on
the cylinder lor
the
quantity
ol
R-13a to
be added,
for
example, if we
have
750
grams
ol Freon
in
the
cylinder
and must
add 140
grams
to the
group,
lhis
amount
will be reached
when
R-134a
hasdropped
to 610
grams,
remembering
that
the
indicator
shows
a lower
limit
of
meniscus.
Do
this
after
choosing
the
scale
corresponding
to
the
gas pressure
different
scales
reported
as the same
gas
pressure
indicated
by
the
pressure
gauge
on
the top of
the
column.
To make
R-134a
flow
into
the
system, open
the
valve
placed
at the
base
of the
cylinder
and connected
to the
filling
tube. The
amount
of
Freon cannot
be added
to the
system all
at once
because
it may
cause
a blocking of motor-
compr€ssor.
Therefore,
proceed
by
adding
the original
quantity
of about
20-30
grrams
and
close
the
valrre
immediat€ly.
The
pressure
rises
and
the
motor compressor
must
start
sucking
the
gas
and lowering
the
pressure
again. Regulate
the
valve
again,
maintaining
the same
manner
until
-
reaching
to the
quantity
of R-134a
established
for the
system
being charged.
When
the
system is running,
the
suction
pressure
musl
be
stabilized
between
0.30 to.
0.6(0.10
to 0.4) atmosphere.
CHARGE TUBE
EXTENSION
MALE
HANSEN
SERVICE
TUBE
EXTENSION
SOLDERING
POINT
Flgure
1
Figure 2
FEMALE
HANSEN
I
v
FILLING
OR
VALVE
TO
BE
OPENEO
CHABGE
TUBE
WHEN
REFILLING
TO
THE
CHABGE
CYLINDER
VALVE
TO
BE CLOSED
AFTER
VACUUM
Flgure
5
-3-