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DISCHARGING SYSTEM
The
pressurized refrigerant
gas
Ul
side system
must
be
discharged
to
a
pressure
approaching
atmospheric
pressure
prior
to
evacuating
refrigerant
inside system
This
operation
should
be made
to
permit
safe
re
oval
when
replacing
system
components
I
Close
high
and
low
pressure
valves of manifold gauge
fully
2
Connect
two
charging
hoses of
manifold
gauge
to
their
respective
service
valves
3
Open
both manifold
gauge
valves
slightly
and
slowly discharge refriger
ant
from system See
Figure
AC
17
Note
Do
not
allow
refrigerant
to
rush
out
Otherwise compressor oil
will
be
discharged
along
with
re
frigerant
AC735
Fig
AC 17
Discharging system
Caution
Protect
fingers
with cloth
against
frostbite
by refrigerant
when
connecting
the
charging
hose
to
the
service
valve
or
disconnecting
it therefrom
Air
Conditioning
EVACUATING
SYSTEM
1
Connect
high
and
low pressure
charging
hoses of manifold gauge
to
their
respective
service
valves of sys
tern
and d
ischarge
refrigerant
from
system
Refer
to
Discharge System
2
When
refrigerant
has
been
dis
charged
to
a
pressure
approaching
at
mospheric
pressure
connect
center
charging
hose
to
a
vacuum
pump
3
Close
both
valves of manifold
gauge
fully
Then
start
vacuum
pump
4
Open
low pressure valve and suck
old
refrigerant
from
ystem
See
Figure
AC 18
S
When
low pressure gauge
reading
has
reached
to
approximately
500
mm
Hg
20 in
Hg
slowly
open
high
pressure valve
See
Figure
AC
19
6
When pressure inside system
has
dropped
to
710
mm
Hg
28
in
Hg
fully
close both
of
valves of manifold
gauge
and stop
vacuum
pump
Let
stand
it
for
5
to
10
minutes in
this
state
and
confirm that the
reading
does
not
rise
Notes
a
The low
pressure
gauge reads lower
by
2S
mm
Hg
I in
Hg
per
a
300
m
1 000 ft elevation Perform
evacu
ation
according
to
the
following
table
Elevation
m
ft
Vacuum of
system
mm
Hg
in
Hg
0
0
300
I
000
600 2 000
900
3
000
710 28
68S
27
660 26
635
25
Note
Values show
readings
of the
low pressure gauge
AC
12
b The
rate
of ascension of the
low
pressure gauge should be
less than
2S
mm
Hg
I
in
Hg
in five
min
utes
If
the
pressure
rises
or
the
specified
negative
pressure
can not
be obtained
there
is
a
leak
in the
system
In this
case
immediately charge
system with
refrigerant
and
repair
the leak
de
scribed
in
the
following
I
Confirm
that
both
valves
of
manifold gauge
are
fully
closed and
then disconnect
center
charging
hose
from
vacuum
pump
2
Connect
center hose
to
can
tap
in
place
of
vacuum
pump
Attach
refrigerant
can
to
can
tap
and
pass
refrigerant
to
manifold
gauge
3
Loosen the connection of
center
fitting
of manifold gauge
to
purge
air
from
center
hose
4
Open
low
pressure valve of mani
fold
gauge
and
charge
refrigerant
into
system After
one can
about 0
4
kg
I
Ib
of
refrigerant
has been
charged
into
system
close low pressure valve
5
Check
for
refrigerant
leakage
with
a
leak detector
Repair
any leak
ages
found
Refer
to
Checking
for
Leaks and
Refrigerant
Leaks
6
Confirm
that
both
valves
of
manifold gauge
are
fully
closed and
then
change
center
charging
hose from
can
tap
to
vacuum
pump
7
Open
high
and
low pressure
valves and operate
vacuum
pump
to
suck
refrigerant
from system
When
the
pressure
in
system has
dropped
to
710
mm
Hg
28
in
Hg
fully
close
both valves of manifold
gauge
7
The
above
operation completes
evacuation
of
system
Next
charge
refrigerant
Refer
to
Charging Refrig
erant
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