5.
UNIT LOCATION
The lurnace shallbeappropnately located to the supply and
retum air dIstribution system. (See "AIR DISTRIBUTION".
Page9)Sides and backof the furnace maybeeoclosed
by
wall framing. (See "Minimum Clearances: Table7.and
Figures 3 through 5.)
The furnace installationisonly ,ntended for free air retum
Ihmugh the furnace door louvers. DO NOT connect a dueled
returna"sySlem directlytothe fumace. Improper installalion
may create a hazard and damage equIpment, as wellasvoid
all warranties.
Furnace maybe InstalledoncombustiblefloOring when
USing
5elles-458 Duct Connectors (see Table10and FIgures 10·
17).
6.
MINIMUM CLEARANCES
Th,s heat",," apphance mustbeInstalled
WIth
clearances
not
less than the minImUms shownInTable7.ThIS
heatIng
appliance mustbeInstalled
With
ample clearance
lor
easy
acceSStothe air lilter. blower assembly. burner assembly.
controls, and vent connections.
Minimum
furnace
clearancestocombustible
materialS
shallbeIn
accordance
with
Ihe
furnace
rallng
plate.
General clearances are as
follows:
a.
All IOstallat,ons; Back (0"), SIdes (0"). Top (6"), Duct
(0") and Roof Jack/Pipe (0")
b Alcove installations (see Ftgure
31:
minImum
18"
clearance at tront of turnace shall be provided lor
future sel\llcing. Aremovable accesspanel should be
III
ALL
MODELS
CLOSET
ALCOVE
Front
'"
""
Back
0"
0"
Sides
0"
0"
Roof
Jack/Pipes
0"
0"
Top
'"
'"
Plenum
Sides
0"
0"
Top
and
SidesofDuct
0"
0"
BottomofDUCI
WIthin
0"
0"
installed between top01the "..mace door
I'ame
and
the cell,ng
c. Closet installatIons
mUSI
use a Iouve'ed door
haVIng
a minImum free area of 235
sq,
on.
when Iocaled
S"
from fumace
l$a<>
Figure
4),
For
speCIal
clearance
between
1,"
and 6". reqUIrements are a louvered door
wllh a minimumof250 sq
,n
Iree a'ea.
With
the
openmgsInthe closet
Ooor
<mectlyinhne
wnh the
louveredopeOlngs
,n
thefurnacedoo' ,Afuliy louvered
c10sel
door mayoeuse<J
(Sa<>
Figure
51.
A CAUTION:
HAZARD
OF
ASPHYXIATION:
Negative
pressure
Inside
the
closet,
with
closet
door
closed
and
the
furnace
blower
operating
on
high
speed,
shall
be
no
more
negative
than
minus
0,05
Inch
water
column.
7.
RETURN AIR PROVISIONS
U.S.A. home manufactures shall comply W'lh ali of the
follOWIng
condilionsto have
U.L
acceptanceof ceilingorm·
floor return all systems for
clOSe!
Installed forced air heanng
appliances;
---
/
..
".
,
•
,,~
..
•
a Regardlessofthe location. the returnairopening mto
Ihe closet shall notbeleSS
lhan specliiedinlhe
appliance's I,stlng
b Meansshallbe provldedlOpreVenl lnadvenentclosure
by
a Ilat oblect placed ove' the returna"opening
whenItIS
located In Ihe lloor of Ihecloset (versus lhe
ven>eal
fronl or Side walil
c,
The cross"sechonal area01the relurn
dUCI
system
leading into the closet, when located in the floo,
Or
ceiling shall notbeless than 250 square ,nches.
d The total hee area ot open,ngs ,n the
Hoor
or ceiling
reglslersservingtne relurn airductsystem must be
at
least 352 sq.in.
AI
leasl one reglste, should
be
Iocaledwhereitisnotlikely
10becoveredby carpellng.
boxes and olhe,oblects,
Figure2.Ove",11
Dimensions
NORDYNE - manufaClUreroflntertherm
Bnd
Miller
products