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optional equipment is recommended: upflow
stand, coil cabinet, upflow duct connector, and
wall mount grille. For ducted systems with air
conditioners or heat pumps, the following op-
tional equipment is recommended: coil cabinet
and upflow duct connector.
NOTE: Refer to the instructions supplied with
any additional accessories for further installa-
tion details.
Filtering Methods - Non-Ducted Return Air
1.
Without optional upflow stand: (see Figure 18)
-install a filter with a minimum unrestricted
medium area of 324 square inches below
the coil cabinet/furnace assembly that is
accessible for monthly cleaning or re-
placement by the homeowner
2.
With optional upflow stand: (see Figure 17)
-stand must use two filters; one is supplied
with the stand and the other MUST be
removed from the furnace and placed in
the stand - see upflow stand instructions
for additional details.
Filtering Methods - Ducted Return Air
1.
Install a filter with a minimum unrestricted
medium area of 324 square inches below
the coil cabinet/furnace assembly that is
accessible for monthly cleaning or replace-
ment by the homeowner
Applications and Furnace
Installation
NOTE: Remove refrigerant line knockouts in
furnace only when installing indoor coil of an air
conditioning or heat pump system.
Refer to instructions supplied with accessory
equipment.
Over-the-Floor Return Air System
(Non-Ducted)
1.
If floor underneath furnace is made of com-
bustible material, locate a pan fabricated of
non-combustible material with 1" upturned
flanges under furnace return air opening
(see Figure 18).
2.
Use optional upflow stand with filters or
construct a suitably braced mounting plat-
form in closet (see Figure 17 or 18).
3.
Install 240V supply circuit(s) and 24V wir-
ing to closet (see Figure 16 for appropriate
locations).
4.
Position optional coil cabinet onto upflow
stand or mounting platform and secure with
three or more fasteners.
5.
Position furnace in upflow mode onto coil
cabinet and secure with two or more fasten-
ers.
6.
Use optional upflow duct connector or field
supplied connector to attach furnace to
overhead supply duct. (see Figure 17)
7.
Install return air grille in closet preferably at
same level as upflow stand or below mount-
ing platform (see Figure 18).
NOTE: Be certain to provide an adequate free
return air area as described under Return Air
Codes and Requirements and Closed-Off
Space Requirements.
Through-the-Floor Return Air System
(Ducted)
1.
Prepare Floor Opening(s):
a. Mark floor opening(s) as shown in Fig-
ure 19. Provide minimum clearances at
rear and left side walls of closet for
installation of furnace and wiring.
b. Cut floor opening on outside edge of
marked line so that opening is slightly
larger than area marked.
c. Additional provisions may be necessary
for optional air conditioning if refrigerant
lines are installed other than at the front
of the furnace.
2.
If return air duct is made of combustible
material, locate a pan fabricated of non-
combustible material with 1" upturned
flanges under furnace return air opening.
Coil Cabinet
Air Filter
Braced
Mounting
Platform
Front
Grille
Figure 18. Over-the-Floor Return Air
System
WALL
FLOOR
Non-combustible
Pan or
Enclosure
17
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