Upfl Ow Furnaces; Over The Floor Return Air (Non-Ducted) - Nordyne Air Conditioner / Heat Pump Air Handler Owner's Manual & Installation Instructions

4. Secure front of unit with one or more fasteners at
mounting hole(s) provided or at tie-down tab. See
Figure 21 (page 18).
5. See Electrical Wiring section (page 13) to complete
furnace installation.
Wall
Coil Air
Filters
A/C or H/P
Coil
24 3/4"
(629 mm)
Figure 13. Alcove Installation
Provide min. 235
sq. in. (1516 cm )
open free area in
front or side wall
or in top of
closet door
0" Side
Clearance
to Furnace
Cabinet
Standard Closet Installation
Provide min. 250
sq. in. (1613 cm
open free area in
front or side wall
or in top of
closet door
0" Side
Clearance
to Furnace
Cabinet
Special 1" Clearance
Figure 14. Closet Installation
12
Return Air Grille
27"
(686 mm)
56"
(1423 mm)
29"
Furnace
( 737 mm)
Front
18"Nearest
Wall or Partition
20"
(508 mm)
CLOSET DOOR
2 )
CLOSET DOOR
Upfl ow Furnaces
The following steps describe installation instructions for
an overhead supply duct system with a return air system
that can be either over the fl oor (unducted) or through
the fl oor (ducted).
NOTE: The 2 Wire Relay Control is NOT recommended
for upfl ow applications, instead, the AC/HP Relay Control
(4-7 wire) should be used when converting some models
to accept an air conditioner. Refer to the instructions
supplied with the Relay Control for further details.
NOTE: Remove refrigerant line knockouts in furnace only
when installing indoor coil from an air conditioner or heat
pump system.
Refer to instructions supplied with accessory equipment.
Over-the-Floor Return Air System (Non-Ducted)
1. If fl oor underneath furnace is made of combustible
material, locate a pan fabricated of non-combustible
material with 1" upturned fl anges under furnace return
air opening (see Figure 15).
2. Use optional upfl ow stand with fi lters or construct a
suitably braced mounting platform in closet. See Figure
16 (page 13).
3. Route 240V supply circuit(s) and 24V wiring to closet.
See Figure 21 (page 18) for appropriate locations.
4. Position optional coil cabinet onto upfl ow stand or
mounting platform and secure with three or more
fasteners.
5. Position furnace in upfl ow mode onto coil cabinet and
secure with two or more fasteners.
6. Use optional upfl ow duct connector or fi eld supplied
connector to attach furnace to overhead supply duct.
See Figure 16.
7. Install return air grille in closet preferably at same
level as upfl ow stand or below mounting platform. See
Figure 15.
NOTE: Be sure to provide an adequate free return air area
as described in the Closed-Off Spaces section(page 7).
Coil Cabinet
Air Filter
Braced
Mounting
Platform
Front
Grille
Figure 15. Over-the-Floor Return Air System
WALL
FLOOR
Non-combustible
Pan or
Enclosure