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Flexible Ducting Systems; Hard Ducting Floor Systems; Horizontal Or Vertical Discharge; Extension Box Discharge - Atwood 8516 Technical Lnstallation Manual

8500-lv series
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Table of Contents
1.
2.
a
4.
E
.
Horizontally installed furnaces
-
using side duct options
-
must
have a minimum of one duct
from
both
lelt
and right side of casing
FLEXIBLE
DUCTING SYSTEMS
When designing flexible duct systems:
.
Avoid
sharp
bends or crushed ducts.
.
Stretch all ducts
and
run them directly
to
outlets, keeping quantity
and angles of bends to a minimum.
Remove knockout plates from desired outlets.
Attach
a
duct adapter to each opening by inserting flange over
casing,
locking the
tab
into casing slot and turning adapter
90"
Attach
and secure lour-inch flexible ducts to adapters.
Run ducts to desired location
within
RV, secure to registers.
Additional ducting may be needed
to
maintain correct static
pressure.
HARD
DUCTING FLOOR SYSTEMS
When
designing
hard ducting systems:
o
Undersized ducting
will
cause high
temperature
limiting.
.
Oversized ducting will cause inadequate air flow
from
registers.
.
When
hard ducting
is
1-112"
in depth, an additional flex duct may
be
needed
to
maintain installation duct
static
requirements.
.
DO NOT install
floor
registers within
2
feet
of return air openings.
-
See ducting option from casing top
and
bottom areas. These
options can
be
with flex ducting or by hard ducting installations.
Hard ducting can be
sealed
using an optional gasket and plenum
plate kits. See parts
list.
HORIZONTAL
OR
VERTICAL
DISCHARGE
Figure
6
Units can be installed as bottom/top or
vertical
bottom discharge
systems.
Remove bottom / top discharge or side
cover
plate, these ducting
options
must be connected to
a
ducting system.
lnsure sealing of all joints
when
use of
a
gasket and plenum plate
for
hard ducting configurations.
Other methods of sealing furnace to the floor are acceptable as long
as clearances and seals meet requirements of clearances and
temperature.
Fasten plenum plate over floor
cutout.
lf
a
gasket and plenum plate
is
not used seal furnace
to
hard duct
system
making sure
seal
is
airtight.
Position gasket on plenum over hole opening.
Set furnace on
gasket;
make sure
gasket
remains in position.
Additional ducting can be used to maintain correct static pressure or
as desired.
EXTENSION
BOX
DISCHARGE
INSIDE
WALL
Figure
7
A
plenum plate may be used for top
or
bottom discharge
installation.
A casing extension box adds 6" of depth to furnace casing. To order
see parts
list.
Remove three knockouts
from
rear of furnace.
Place extension box with foam gasket against
furnace,
making sure
the three openings are enclosed within
extension
box. With
extension box held in place, secure
with
lwo
112"
sheet metal
screws
not provided.
3.
Fasten plenum plate over cutout.
4.
Position gasket on plenum plate.
5.
Set
furnace
on
gasket;
make sure
gasket
remains in position.
6.
Fasten extension box to floor
with
1i4"
sheet
metal screws or
staples.
7.
Additional ducting can be used
to
maintain correct static pressure or
as desired.
FLEX
ADAPTER PLATE
Figure
8
A flex adapter may be used to provide more flexibility
for
alignment
of discharge opening on hard duct systems. This system can be
used on all models
installed
horizontally or
vertically
providing
ducting
from
rear of furnace
without
using side
ducts.
Use of
a
flexible mounting plate kit
is
available. See parts
list.
Remove
three
knockouts
from
rear of furnace.
lnstall duct
adapters
in each opening.
Place flex adapter plate with foam tape
against
hard ducting making
sure openings line
up.
1.
2.
1.
J.
4.
5.
6.
7.
Floor cutout dimensions
B
c
D
E
18"
1t2"
5"
to
114"
Floor cutout dimensions
A
B
c
D
8-1t2
s-'t/2"
6-1t4"
1t4"

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