14
11.1 Reuse Existing Refrigerant Lines
For
retrofit
applications
,
where
the
existing
refrigerant
lines
will
be
used
,
the
following
precautions
should
be
taken
:
Ensure
that
the
refrigerant
lines
are
the
correct
size
.
Refer
to
Section
2
.
2
listed
and
Table
5
.
1
.
Ensure
that
the
refrigerant
lines
are
free
of
leaks
,
acid
,
and
oil
.
!
CAUTION
If
using
existing
refrigerant
lines
make
certain
that
all
joints
are
brazed
,
not
soldered
.
Section
12
.
Refrigerant
Line
Routing
12
.
1
Precautions
Important
:
Take
precautions
to
prevent
noise
within
the
building
structure
due
to
vibration
transmission
from
the
refrigerant
lines
.
For
Example
:
When
the
refrigerant
lines
have
to
be
fastened
to
floor
joists
or
other
framing
in
a
structure
,
use
isolation
type
hangers
.
Isolation
hangers
should
also
be
used
when
refrigerant
lines
are
run
in
stud
spaces
or
enclosed
ceilings
.
Where
the
refrigerant
lines
run
through
a
wall
or
sill
,
they
should
be
insulated
and
isolated
.
Isolate
the
lines
from
all
ductwork
.
Minimize
the
number
of
90
º
turns
.
Comply
with
National
,
State
,
and
Local
Codes
when
isolating
line
sets
from
joists
,
rafters
,
walls
,
or
other
structural
elements
.
Note
:
The
manufacturer
recommends
installing
only
approved
matched
indoor
and
outdoor
systems
.
All
of
the
manufacturer
'
s
split
systems
are
A
.
H
.
R
.
I
.
rated
only
with
TXV
indoor
systems
.
Some
of
the
benefits
of
installing
approved
matched
indoor
and
outdoor
split
systems
are
maximum
efficiency
,
optimum
per
-
formance
and
the
best
overall
system
reliability
.
Section 11. Refrigerant Lines Insulation
Imporant:
The Suction Line must always be
insulated DO NOT allow
the
Liquid
Line
and
Suction
Line
to
come
in
direct
(
metal
to
metal
)
contact
.
Suction
Line
Liquid
Line
Insulation
