27
5.6
Branch
Joints
Use
U
‐
shaped
branch
joints
as
specified
on
the
construction
drawings
–
do
not
replace
U
‐
shaped
branch
joints
with
tee
joints.
To
avoid
accumulation
of
oil
in
the
outdoor
units,
outdoor
branch
joints
should
be
installed
horizontally
and
must
not
be
higher
than
the
outdoor
unit
refrigerant
outlets.
Refer
to
Figure
3
‐
5.9.
Indoor
branch
joints
may
be
installed
either
horizontally
or
vertically.
Horizontal
branch
joints
must
be
installed
at
an
angle
to
the
horizontal
not
exceeding
10°
in
order
to
avoid
uneven
distribution
of
refrigerant
and
possible
malfunction.
Refer
to
Figure
3
‐
5.8.
Figure
3
‐
5.8:
Branch
joint
orientation
Figure
3
‐
5.9:
Installation
of
outdoor
branch
joints
To
ensure
even
distribution
of
refrigerant,
a
limitation
is
placed
on
how
close
branch
joints
may
be
installed
to
bends,
other
branch
joints
and
the
straight
sections
of
piping
leading
to
indoor
units.
Refer
to
Installation
Manual,
4.6
“Branch
Joints”.
Notes
for
installers
10°
10°
A
Correct
Wrong
U-shaped branching pipe
Horizontal surface
A direction view
