Unconditioned Spaces; Closed-Off Spaces; Filtering Methods - Downfl Ow Furnaces; Non-Ducted Return Air - Nordyne Air Conditioner / Heat Pump Air Handler Owner's Manual & Installation Instructions

Unconditioned Spaces

All duct work passing through unconditioned space must
be properly insulated to minimize duct losses and prevent
condensation. Use insulation with an outer vapor barrier.
Refer to local codes for insulation material requirements

Closed-Off Spaces

Living space not served by, and closed off from the return air
ducts to the furnace (by doors, sliding partitions, and other
means) must be provided with permanent, uncloseable
openings in the doors or partitions to allow air to return to
the furnace from all parts of the home. Return air grilles,
with a minimum open area of one square inch for every
fi ve square feet of living space closed off from the furnace,
must be provided in the door or room partition.
Filtering Methods - Downfl ow Furnaces

Non-Ducted Return Air

For unducted return air systems, either the optional grille
and frame assembly or the optional wall mount grille is
recommended.
Without A/C or H/P uncased coil:
• Use the fi lter supplied with the furnace; ensure that
the fi lter is installed mat side down between the fi lter
retainer and furnace top. See Figure 2.
With A/C or H/P uncased coil:
• Use the optional coil fi lters; the fi lter supplied with the
furnace is not used; REMOVE AND DISCARD THIS
FILTER.

With optional coil housing:

• See coil cabinet instructions for specifi c fi ltering methods.

Ducted Return Air

For ducted return air systems with air conditioners or heat
pumps, either providing an access panel in the duct or
using the optional coil cabinet (Figure 3) is recommended.
The duct system must be properly sized to account for
any additional external static pressure produced from the
chosen fi ltering method.

Without optional coil housing:

• Install a fi lter with a minimum unrestricted medium area
of 324 in 2 in the duct above the coil that is accessible
for monthly cleaning or replacement by homeowner.
With optional coil housing:
• Install a fi lter with a minimum unrestricted medium area
of 324 in 2 in the duct above the coil that is accessible
for monthly cleaning or replacement by homeowner.
Filtering Methods - Upfl ow Furnaces
Non-Ducted Return Air
Furnaces may be installed with unducted or ducted return
air. For unducted systems with air conditioners or heat
pumps, the following optional equipment is recommended:
upfl ow stand, coil cabinet, upfl ow duct connector, and
wall mount grille.
Grille
Furnace Filter
(not used with
A/C or H/P)
Figure 2. Grille Support Frame & Grille Assembly
Cabinet
Insulation
Figure 3. Upfl ow Coil Cabinet
Without optional upfl ow stand:
• Install a fi lter with a minimum unrestricted medium area
of 324 in 2 below the coil cabinet/furnace assembly that
is accessible for monthly cleaning or replacement by
the homeowner
With optional upfl ow stand:
• Stand (Figure 4, page 8) must use two fi lters: one is
supplied with the stand and the other MUST be removed
from the furnace and placed in the stand. See instructions
supplied with the upfl ow stand for additional details.
Ducted Return Air
For ducted systems with air conditioners or heat pumps,
the following optional equipment is recommended: coil
cabinet and upfl ow duct connector.
• Install a fi lter with a minimum unrestricted medium area
2
of 324 in below the coil cabinet/furnace assembly that
is accessible for monthly cleaning or replacement by
the homeowner
Frame
Fasteners (4)
Top of
Furnace
29"
(737 mm)
7