Gas side
Liquid side
Cap
Hexagonal wrench
2-way valve
(Open)
3-way valve
(Close)
C
Evacuation
Soap w
ater method
Re
mo
ve t
he c
ap
s fro
m th
e 2-w
ay a
nd 3
-w
ay
va
lv
es
.
Re
mo
ve
th
e s
erv
ic
e-p
ort
ca
p fr
om
th
e 3
-w
ay
va
lv
es
.
To o
pe
n th
e 2-w
ay v
alv
e tu
rn t
he v
alv
e ste
m
co
un
te
rc
lo
ck
wis
e ap
pro
xim
ate
ly 9
0°, w
ait f
or
ab
ou
t 2~
3 se
c, a
nd c
lo
se i
t.
Ap
ply
a s
oa
p w
ate
r o
r a
liq
uid
ne
utr
al
de
te
rg
en
t
on
th
e in
do
or
un
it
co
nn
ec
tio
n o
r o
utd
oo
r u
nit
co
nn
ec
tio
ns
by
a s
oft
bru
sh
to
ch
ec
k fo
r
le
ak
ag
e o
f th
e c
on
ne
cti
ng
po
in
ts
of
th
e p
ip
in
g.
If
bu
bb
le
s c
om
e o
ut,
th
e p
ip
es
ha
ve
le
ak
ag
e.
(1
)
(2
)
(3
)
(4
)
(5
)
Connect the
charge hose
end described
in the
preceding steps
to the
vacuum pump
to
evacuate the
tubing and
indoor unit.
Confirm the
"Lo" knob
of the
manifold valve
is
open. Then,
run the
vacuum pump.
The operation
time for
evacuation varies
with
tubing length
and capacity
of the
pump. The
following table
shows the
time required
for
evacuation.
Required time
for evacuation
when 30
gal/h
vacuum pump
is used
If tubing
length is
less
than 10m
(33 ft)
10 min.
or more
15 min.
or more
If tubing
length is
longer
than 10m
(33 ft)
When the
desired vacuum
is reached,
close the
"Lo" knob
of the
manifold valve
and stop
the
vacuum pump.
D
Finishing the job
With a
service valve
wrench, turn
the valve
stem
of liquid
side valve
counter-clockwise to
fully
open the
valve.
Turn
the valve
stem of
gas side
valve
counter-clockwise to
fully open
the valve.
Loosen the
charge hose
connected to
the gas
side
service port
slightly to
release the
pressure, then
remove the
hose.
Replace the
flare nut
and its
bonnet on
the gas
side
service port
and fasten
the flare
nut securely
with an
adjustable wrench. This process is very important to
prevent leakage
from the
system.
Replace the
valve caps
at both
gas and
liquid side
service valves
and fasten
them tight.
This completes
air purging
with a
vacuum pump.
The air
conditioner is
now ready
to test
run.
Indoor unit
Outdoor unit
Lo
Hi
Manifold valve
Vacuum pump
Pressure
gauge
Open
Close
AIR PURGING
INSTALL
ATION
19
