Installation guide
C.
ROUTING
AND
SUSPENDING
REFRIGERANT
LINES
Run
refrigerant
lines
as
straight
and
direct
as
possible,
avoiding
unnecessary
bends
and
turns.
Always
insulate
the
entire
suction
line.
Both
lines
should
be
insulated
when
routed
through
an
attic
or
when
routed
through
an
underground
raceway.
When
routing
refrigerant
lines
through
a
foundation
or
wall,
do
not
allow
refrigerant
lines
to
come
in
direct
contact
with
the
building
structure.
Make
openings
large
enough
so
that
lines
can
be
wrapped
with
extra
insulation.
Fill
all
gaps
with
RTV
caulk.
This
will
prevent
noise
transmission
between
the
tubing
and
the
foundation
or
wall.
Along
floor
or
ceiling
joists,
suspend
refrigerant
lines
so
that
they
do
not
contact
the
building
structure,
water
pipes,
or
ductwork.
Use
insulated
or
suspension
type
hangers.
Metal
straps
must
be
at
least
1”
(25mm)wide
to
avoid
cutting
into
the
tube
insulation.
Keep
the
liquid
and
suction
lines
separate.
Refer
to
Figure
5.
Figure
5
Routing
and
Suspending
Refrigerant
Lines
JOIST
OUTDOOR
WALL
INDOOR
WALL
a
HANGER
STRAP
CAULK
(AROUND
SUCTION
~—_¢
LIQUID
TUBE
TUBE
ONLY)
WY)
INSULATION
SUCTION
TUBE
O
oO
t
0
SUCTION
TUBE
INSULATION
1”
(25mm)
MIN
—| be
LIQUID
TUBE
THROUGH
THE
WALL
SUSPENSION
A
CAUTION
UNIT
OPERATION
HAZARD
Failure
to
follow
this
caution
may
result
in
improp-
er
product
operation.
Do
not
bury
more
than
36”
(1m)
of
line
set
under-
ground.
Refrigerant
may
migrate
to
cooler
buried
section
during
extended
periods
of
unit
shut-
down,
causing
refrigerant
slugging
and
possible
compressor
damage
at
start-up.
If
ANY
section
of
the
line
set
is
buried
under-
ground,
provide
a
minimum
6”
(152mm)
vertical
rise
at
the
service
valve.
D.
OUTDOOR
UNIT
HIGHER
THAN
INDOOR
UNIT
Proper
oil
return
to
the
compressor
should
be
maintained
with
suction
gas
velocity.
If
velocities
drop
below
1500
fom
(feet
per
minute),
oil
return
will
be
decreased.
To
maintain
suction
gas
velocity,
do
not
upsize
vertical
suction
risers.
E.
LIQUID
LINE
FILTER-DRIER
Outdoor
units
are
shipped
with
an
appropriate
filter—drier
for
installation
in
the
liquid
line.
Leave
the
plugs
in
the
tube
ends
until
the filter—drier
is
installed.
The
optimal
location
for
the
filter-drier
is
close
to
the
indoor
coil.
Heat
pump
filter-driers
are
“bi-flow’
type.
Either
end
can
be
pointed
towards
indoor
coil.
Refer
to
Figure
6.
Liquid
Line
Filter—-Drier
Figure
6
Installed
at
Indoor
Coil
Filter—Drier
Na
38-11-84
428
01
5103
02