Air Distribution Systems; Duct Connector Selection - Nordyne M3RL 060A AW Installation Instructions Manual

DUCTED RETURN AIR
M3furnaces w ithmodel n umbers ending inAW
or BWarefactoryconfigured for the returnair
to flow throughthe front Iouvered door.The
returnairmayalsobeattached to eithersideor
the top of the furnacecabinetusing a field
installed kit.RefertoTable10fortheNORDYNE
ductedreturnkitP/Nnumber. T helocation and
sizeof the sideandtop returnair connections
areshown in Figure 1.Thefiltersizefortheside
return airis20"x20"x 1".Fortopreturn thefilter
size is 24" x 16"x 1".
M3 furnaceswith modelnumbersendingin
BWTarefactoryconfigured forthe returnairto
enterthe top of the furnace.
AIR DISTRIBUTION SYSTEMS
For proper air distribution, the supply duct
system must be designed so that the static
pressure measured external to the furnace
does not exceed the listed static pressure
rating shown on the furnace rating plate.
Three typical distribution systems are illus-
trated in Figure 2. Location, size, and number
of registers should be selected on the basis of
best air distribution and floor plan of the home.
DUCT CONNECTOR SELECTION
PLATINUM SERIES
a. For Platinum ready construction use
the 14" round plenum, p/n: 903896.
NON=PLATINUM SERIES
a.
b.
Determine depth of floor cavity from
surface of floor to top of supply air duct
(See Figure 3).
Select appropriate model from Table 5
which matches X-dimension of the floor
cavity. To maximize air delivery, re-
move reducer "C" (see Figure 5) to
obtain the largest open area that will fit
the duct/floor construction.
MOUNTING
PLATE
FLOOR
OPENING
REAR WALL
SUPPLY AIR DUCT
FUEL
LINE
HOLES
Figure 8. Mounting Plate
BEND CONNECTOR TABS
UNDER DUCT OPENING
Finger Tabbed
Duct Connectors
Screw
Down
Duct Connectors
MOUNTING
PLATE
SCREWS
CONNECTION
Platinum Series
Figure 9. Duct Connector Types
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