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DISCHARGE
DUCT
FLANGE
NO
Horizontal
Furnaces
(onnect
supply-air
&ct
to supply
air opening
on ftm_ace
The
supply-air
duct attachment
must
ONLY
be connected
to ftmaace
supply/outlet
or air conditioning
coil casing (when used)
DO NOT
cut main f_rnace
casing to attach supply
side air duct, humidifier,
or other accessories.
All accessories
MUST
be connected
external
to fhrnace
main casing.
I
I
210 °
.....................
MIN
Fig. 23--Duct
Flanges
YES
YES
A93029
Flexible
connections
should
be
used
between
ductwork
and
_;,/rnace to prevent
transmission
of vibration
Ductwork
passing
through
unconditioned
space
should
be
insulated
to
enhance
system
perforn_ance.
When
air
conditioning
is use&
a vapor
barrier
is recommended.
Maintain
a l-in. clearance
fi'om comhustible
materials
to supply air
ductwork
fbr a distance
of 36 in. horizontally
fiom the t_urnace. See
NFPA
90B or local
code fbr _hrther requirements.
For a fhmace
not equipped
with a cooling
coil, the outlet duct shall
be provided
with a removable
access
panel. This opening
shall be
accessible
when the ft,.mace is installed
and shall be of such a size
that the heat exchanger
can be viewed
%r possible
openings
using
light assistance
or a probe
can be inserted
for sampling
the air
stream.
The cover
attachment
shall prevent
leaks.
DU(TWORK
ACOUSTICAL
TREATMENT
Metal
duct systems
that do not have a 90 degree
elbow
and 10 fi
of main
&ct
to the first
branch
rake-off
may
require
internal
acoustical
lining
As an ahernative,
fibrous
ductwork
may be used
if constructed
and installed
in accordance
with the latest edition
of
SMACNA
construction
standard
on fibrous
glass
ducts
Both
acoustical
lining
and fibrous
ductwork
shall
comply
with NFPA
90B as tested
by UL Standard
181%r
(lass
1 Rigid
air ducts.
SUPPLY
AIR (ONNECTIONS
L pflow
Furnaces
Connect
supply-air
duct
to 3/4-in
flange
on _hrnace
supply-air
outlet. The supply-air
duct attachment
must ONLY
be connected
to fbrnace
supply-/outlet-air
duct flanges
or air conditioning
coil
casing
(when
used)
DO NOT
cut main
fhmace
casing
to attach
supply
side air duct, humidifier,
or other accessories.
All accesso-
ries MUST
be connected
external
to ft_rnace main casing
Downflow
Furnaces
(onnect
supply-air
duct
to supply-air
opening
on t_urnace. The
supply-air
duct attachment
must
ONLY
be connected
to t'umace
supply/outlet
or air conditioning
coil casing
(when
used),
when
installed
on non-comhustible
material.
When installed
on comhus-
tible
material,
supply-air
duct attachment
nmst
ONLY
be con-
nected
to an accesso_-
subbase
or _i_ctory approved
air condition-
ing coil casing.
DO NOT cut main fhmace
casing to attach supply
side
air duct,
humidifier,
or other
accessories.
All
accessories
MUST
be connected
external
to fi/rnace
main casing.
--9
2O
RETETRN AIR (ONNECTIONS
The
t:t_rnace
and
its remm
air system
shall
be
designed
and
installed
so that negative
pressure
created
by the air circulating
fan
cannot
a£f_ct another
appliance's
air supply or act to mix products
of combustion
with circulating
air, and that the air circulating
fan
of the fhrnace,
if installed
in an enclosure
communicating
with
another
fhel-burning
appliance
not of the direct-vent
type, shall be
operable
only when
any door or panel covering
an opening
in the
ft_rnace fan compartment
or in a return
air plenum
on ducts is in
the closed
position.
FIRE
HAZARD
A failure
to %11ow this warning
could result
in fire, personal
Jr{jury, or death
Never
connect
return-air
ducts
to the back
of the t'umace
Return-air
duct connections
on ftm_ace
side(s)
pem_itted
in
upflow
applications
only
Upflow
Furnaces
The
return-air
duct must
be connected
to bottom,
sides (left or
right),
or a combination
of bottom
and side(s)
of main
furnace
casing as shown in Fig
2 Bypass
humidifier
may be attached
into
unused
side remm
air portion
of the furnace
casing.
DO NOT
connect
any portion
of return-air
duct to back of furnace
casing.
Downflow
and Horizontal
Furnaces
The
return-air
duct
must
be
connected
to return-air
opening
provided
as shown in Fig. 2 DO NOT cut into casing sides or back
to attach any portion
of return-air
duct
Bypass
humidifier
connec-
tions
should be made
at ductwork
or coil casing
sides exterior
to
ft_rnace
Step
5--FHter
Arrangement
FIRE,
CARBON
MONOXIDE
AND POISONING
HAZARD
Failure
to %11ow this warning
could
result
in fire, personal
injury,
or death
Never
operate
unit without
a filter
or with
blower
access
panel removed.
Factory-supplied
washable
framed
filters
are shipped
in blower
comparm_ent
Determine
location
%r
filter
and relocate
filter
retaining
wire if necessaD-
See Table 4 to determine
correct
filter
size
%r
desired
filter
location.
Table
4 indicates
filter
size,
location,
and quantity-
shipped
with
this _hmace.
See Fig. 2 for
location
and size of bottom
and side return-air
openings.
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