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Carrier 58SC Application Data

Carrier 58SC
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within
the
space
containing-the
fu'i'&ace.
A
positive
seal
must
be
made
between
the
furnace
base
and
platform
or
return-air
duct
connections.
Even
a
slight
leak
can
create
a
negative
pressure
condition
in
a
confined
closet
or
basement
and
affect
combustion.
If
necessary,
seal
the
furnace
base-to-floor
opening
with
fiberglass
or
other
approved
material.
Furnaces
with
side-connected
returns
should
use
the
factory-supplied
bottom
closure,
properly
sealed.
For
complete
combustion
and
ventilation,
the
furnace
requires
approximately
20
cu
ft
of
air
for
every
1000
Btuh
of
gas
consumed.
Thus,
for
each
1000
Btuh
of
gas
con¬
sumed,
a
total
of
20
cu
ft
of
air
must
be
supplied.
For
a
100,000-Btuh
gas
furnace,
this
equals
2000
cu
ft
of
air
per
hour
(100
x
20)
or
33
cu
ft
of
air
per
minute
(2000
f-
60).
In
the
past,
the
infiltration
of
outside
air
assumed
in
heat
loss
calculations
(one
air
change
per
hour)
was
sufficient.
However,
current
construction
methods
using
more
insu¬
lation
and
vapor
barriers,
tighter
fitting
and
gasketed
doors
and
windows,
or
weatherstripping,
and
the
presence
of
fuel-burning
fireplaces
and
household
exhaust
fans
require
positive
introduction
of
outside
air.
Use
of
exhaust
fans,
kitchen
ventilation
systems,
clothes
dryers
and
fireplaces
may
create
conditions
that
require
special
attention
to
avoid
unsatisfactory
furnace
operation.
Exhaust
fans
and
range
hoods
can
handle
from
60
to
300
cfm
(or
more).
Gas
and
electric
clothes
dryers
remove
even
more
air.
Use
of
multiple
appliances
requires
special
mandatory
provisions
for
positive
intro¬
duction
of
outside
air.
This
makeup
air
requirement
is
several
times
that
required
by
the
furnace
and
must
be
replaced,
in
addition
to
the
air
required
by
the
furnace.
A
CAUTION
Combustion
air
must
come
from
a
source
not
con¬
taminated
by
halogens,
which
include
fluorides,
chlorides,
bromides
and
iodides.
These
elements
are
found
in
aerosols,
detergents,
bleaches,
cleaning
solvents,
salts,
air
fresheners
and
other
household
products.
Vapors
from
these
products
are
highly
corrosive
to
gas-fired
furnaces,
even
in
extremely
low
concentrations
—
as
low
as
1/2
part
per
million.
When
such
contaminants
are
present,
outside
air
must
be
ducted
separately
to
the
furnace
room.
Requirements
for
combustion
and
ventilation
air
depend
upon
whether
furnace
is
located
in
a
confined
or
unconfined
space.
An
unconfined
space
is
defined
as
a
space
where
volume
is
not
less
than
50
cu
ft
per
1000
Btuh
of
the
total
input
rating
of
all
appliances
installed
in
that
space.
Rooms
directly
open
(no
doors)
to
the
space
in
which
the
appliances
are
installed
are
considered
a
part
of
the
unconfined
space.
A
confined
space
is
defined
as
a
space
with
volume
less
than
50
cu
ft
per
1000
Btuh
of
the
total
input
ratings
of
all
appliances
in
that
space.
Furnaces
in
Confined
Spaces
(Typical
Furnace
Closet)
ALL
AIR
FROM
INSIDE
BUILDINGS
—
The
con¬
fined
space
shall
be
provided
with
2
permanent
openings,
one
beginning
within
12
in.
of
the
top
and
one
beginning
within
12
in.
of
the
bottom
of
the
enclosure.
Each
opening
shall
have
a
minimum
free
area
of
one
sq
in.
per
1000
Btuh
of
the
total
input
rating
of
all
equipment
in
the
enclo¬
sure,
but
not
less
than
100
sq
inches.
The
openings
must
freely
communicate
with
other
interior
areas
served
by
the
furnace,
of
sufficient
volume
so
that
the
combined
volume
of
all
spaces
meets
the
criteria
for
an
unconfined
space.
This
can
be
accomplished
through
either
per¬
manent
openings
or
louvered
doors.
In
addition,
if
the
building
is
of
unusually
tight
con¬
struction,
there
shall
be
one
permanent
opening
commu¬
nicating
directly
with
outdoors.
This
opening
shall
have
a
minimum
free
area
of
one
sq
in.
per
5000
Btuh
of
total
input
rating
of
all
equipment
in
the
enclosure.
Ducts
shall
be
used
to
convey
makeup
air,
and
shall
be
of
the
same
cross-sectional
area
as
the
free
area
of
the
openings
to
which
they
connect.
This
duct
should
be
connected
to
the
cold
air
return
of
the
heating
system.
The
minimum
dimension
of
the
rectangular
air
ducts
should
not
be
less
than
3
inches.
See
Fig.
1.
If
furnace
is
installed
on
a
raised
platform
to
provide
a
return-air
plenum,
and
return
air
is
taken
directly
from
the
hallway
or
space
adjacent
to
the
furnace,
all
air
for
combustion
must
come
from
the
outside,
as
prescribed
in
paragraph
below.
ALL
AIR
FROM
OUTDOORS
—
The
confined
space
shall
be
provided
with
2
permanent
openings,
one
com¬
mencing
within
12
in.
of
the
top
and
one
commencing
within
12
in.
of
the
bottom
of
the
enclosure.
These
open¬
ings
shall
communicate
directly,
or
by
ducts,
with
out¬
doors.
See
Fig.
2.
a.
When
communicating
with
the
outdoors
through
horizontal
ducts,
each
opening
shall
have
a
minimum
free
area
of
one
sq
in.
per
2000
Btuh
of
the
total
rated
input
of
all
equipment
in
the
enclosure.
If
vertical
ducts
or
openings
with
louvers
and
grilles
are
used,
each
opening
or
duct
shall
have
a
minimum
free
area
of
one
sq
in.
per
4000
Btuh
of
the
total
rated
input
of
all
equipment
in
the
enclosure.
b.
When
ducts
are
used,
they
shall
be
of
the
same
cross-
sectional
area
as
the
free
area
of
the
openings
to
which
they
connect.
The
minimum
dimension
of
rectangular
air
ducts
shall
not
be
less
than
3
inches.
Furnaces
in
Unconfined
Spaces
(Basements,
Large
Equipment
Rooms,
etc.)
—
If
the
uncon¬
fined
space
is
within
a
building
of
unusually
tight
con¬
struction,
air
for
combustion,
ventilation
and
dilution
of
flue
gases
shall
be
obtained
from
outdoors
or
from
spaces
freely
communicating
with
the
outdoors.
A
permanent
opening,
or
openings,
having
a
total
free
area
of
not
less
than
one
sq
in.
per
5000
Btuh
of
total
input
rating
for
all
equipment
shall
be
provided.
A
duct
may
be
used
to
con¬
vey
makeup
air
from
the
outdoors
and
shall
be
of
the
same
cross-sectional
area
as
the
free
area
of
the
openings
to
which
it
connects.
The
duct
may
be
connected
to
the
cold
air
return
of
the
heating
system
only
if
it
connects
directly
to
outside
air
.
The
minimum
dimension
of
rectangular
air
ducts
shall
be
not
less
than
3
inches.
A
CAUTION
Return
air
must
not
be
taken
from
the
room,
unless
an
equal
or
greater
amount
of
air
is
supplied
to
the
room.
All
duct
connections
to
the
furnace
must
be
airtight
to
avoid
causing
a
negative
pressure
condi¬
tion
within
the
room.
Louvers
and
Grilles
—
In
calculating
the
free
area,
consideration
shall
be
given
to
the
blocking
effect
of
louvers,
grilles,
or
screens
protecting
openings.
Screens
used
must
not
be
smaller
than
1
/
4-in.
mesh.
If
the
free
area
through
a
design
of
louver
or
grille
is
known,
it
should
be
used
in
calculating
the
size
opening
required
to
provide
the
free
area
specified.
If
the
design
and
free
area
is
not
known,
assume
that
wood
louvers
will
have
20
to
25%
free
area
and
metal
louvers
and
grilles
will
have
60
to
75%
free
area.
Louvers
and
grilles
that
provide
combustion
and
dilution
air
must
be
constructed
so
they
cannot
be
closed.
©
2

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Carrier 58SC Specifications

General IconGeneral
BrandCarrier
Model58SC
CategoryFurnace
LanguageEnglish

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