Installation guide
H.
EVACUATING
LINE
SET
AND
INDOOR
COIL
The
unit
is
shipped
with
a
factory
refrigerant
charge.
The
liquid
line
and
suction
line
service
valves
have
been
closed
after
final
testing
at
the
factory.
Do
not
disturb
these
valves
until
the
line
set
and
indoor
coil
have
been
evacuated
and
leak
checked,
or
the
charge
in
the
unit
may
be
lost.
NOTE:
Do
not
use
any
portion
of
the
factory
charge
for
purging
or
leak
testing.
The
factory
charge
is
for
filling
the
system
only
after
a
complete
evacuation
and
leak
check
has
been
performed.
CAUTION
PRODUCT
DAMAGE
HAZARD
Failure
to
follow
this
caution
may
result
in
product
damage.
A
Never
use
the
outdoor
unit
compressor
as
a
vacu-
um
pump.
Doing
so
may
damage
the
compressor.
Line
set
and
indoor
coil
should
be
evacuated
using
the
recommended
deep
vacuum
method
of
500
microns.
If
deep
vacuum
equipment
is
not
available,
the
alternate
triple
evacuation
method
may
be
used
by
following
the
specified
procedure.
If
vacuum
must
be
interrupted
during
the
evacuation
procedure,
always
break
vacuum
with
dry
nitrogen.
Deep
Vacuum
Method
The
deep
vacuum
method
requires
a
vacuum
pump
capable
of
pulling
a
vacuum
to
500
microns
and
a
vacuum
gauge
capable
of
accurately
measuring
this
vacuum
level.
The
deep
vacuum
method
is
the
most
positive
way
of
assuring
a
system
is
free
of air
and
water.
Watch
the
vacuum
gauge
as
the
system
is
pulling
down.
The
response
of
the
gauge
is
an
indicator
of
the
condition
of
the
system
(refer
to
Figure
8).
With
no
leaks
in
the
system,
allow
the
vacuum
pump
to
run
for
30
minutes
minimum
at
the
deep
vacuum
level.
Deep
Vacuum
Gauge
Response
Figure
8
and
System
Conditions
5000
—
4500
—
4000
—
3500
—
LEAK
IN
SYSTEM
8
3000
4
&
2500
—
oO
5
2000
4
=
VACUUM
TIGHT
4500
TOO
WET
4000
TIGHT
500
DRY
SYSTEM
T T T T T T T T
0
1
2
3 4 5
66
7
MINUTES
Triple
Evacuation
Method
The
triple
evacuation
method
should
only
be
used
when
system
does
not
contain
any
water
in
liquid
form
and
vacuum
pump
is
only
capable
of
pulling
down
to
28
inches
of
mercury
(711mm
Hg).
Refer
to
Figure
9
and
proceed
is
as
follows:
1.
Pull
system
down
to
28
inches
of
mercury
(711mm
Hg)
and
allow
pump
to
continue
operating
for
an
additional
15
minutes.
2,
Close
manifold
valves
or
valve
at
vacuum
pump
and
shut
off
vacuum
pump.
3.
Connect
a
nitrogen
cylinder
and
regulator
to
system
and
fill
with
nitrogen
until
system
pressure
is
2
psig.
4.
Close
nitrogen valve
and
allow
system
to
stand
for
1
hour.
During
this
time,
dry
nitrogen
will
diffuse
throughout
the
system
absorbing
moisture.
5.
Repeat
this
procedure
as
indicated
in
Figure
9.
6.
After
the
final
evacuate
sequence,
confirm
there
are
no
leaks
in
the
system.
If
a
leak
is
found,
repeat
the
entire
process
after
repair
is
made.
Figure
9
Triple
Evacuation
Sequence
EVACUATE
v
BREAK
VACUUM
WITH
DRY
NITROGEN
WAIT
EVACUATE
ih
BREAK
VACUUM
WITH
DRY
NITROGEN
v
WAIT
v
EVACUATE
v
CHECK
FOR
TIGHT,
DRY
SYSTEM
(IF
IT
HOLDS
DEEP
VACUUM)
v
CHARGE
SYSTEM
428
01
5103
02