Air Requirements; Combustion Air - Coleman 7600 Service Manual

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13.
14.
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INSTALLATION
INSTRUCTIONS
ll.
Slide the furnace
out
of
the
closet
or
alcove and
lay
it
on its
btrck.
Rernove
the nuts
I'rom
the studs around
the
flue
at the
top of
the furnace.
To
remove
the
burner
from the
furnace,
remove
the
six
screws
from the plate behind the
control
valve
that
lastens
it
to
the
furnace.
'filt
the
burner
end
down
out of the heat
exchanger
and withdraw
burner
from
combustion
air
tube.
Remove
the nuts lrom the
studs
that are
located
inside the combustion
air tube
and
at its very
back.
Remove
the
mid-panel
that
separates
the
upper
and lower
areas
of
the furnace.
Remove
the cover plate from the electrical
control
box.
Remove
the
two
screws
in
the
control box
that
are
located
along the side nearest
the furnace
wall.
Remove
the internal
front
panel
of
the lurnace
by
removing
the
screws
from around
its
sides. Lift
both the
furnace's
internal panel and the heat
ex-
changer
out of
the furnace body.
Remove
the
screw
from the view plate
on
the
internal panel and
detach
the panel from the
heat
11.
exchanger.
19.
lnstall the new heat
exchanger, gaskets and
other
lurnace parts
by
using
the
above procedures
in
re-
verse order.
20. Use
the
installation instructions
lor
correct
pro-
cedure
in
re-installing the furnace.
AIR
REQUIREMENTS
The proper operation
of any Mobile Home furnace
is
dependent
upon
satisfying
the
requirements
for
four
types
of
air.
l.
Comhustion
air
As
seen
in
the cut-a-way
vlew
of the PRESIDENTIAL
furnace,
combustion
air
is
supplied to the
burner through the roof
jack.
Down the
back of the furnace
to an
area
below the combustion
chamber.
Primary air
for combustion is drawn
into'
the
venturi of
the
burner by the
action of
gas velocity
(aspiration)
in
the
venturi. This air and gas mixture
is
thoroughly mixed
in
the mixing
chamber
and
discharged
upward against
the
flame spreader where
it
is ignited by the
pilot.
Combustion is completed
with
the
addition of
secon-
dary
air around the outside
of the burner into
the
combustion
chamber.
The hot products
of combustion then rise
in
the
heat
exchanger and pass
to the
outside
through the flue
and roof jack. All
combustion
air is
taken
from
the
outside resulting
in a
system
referred
to
as
sealed
combustion.
See
Figure 8
.
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Figure
8.