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Drain Trap and Lines
In horizontal applications, the condensate drain trap is secured to
the furnace side panel, suspending it below the furnace. A
minimum clearance of 4³⁄₄" (12.1 cm) below the furnace must be
provided for the drain trap. Additionally, the appropriate
downward piping slope must be maintained from the drain trap to
the drain location. See "Condensate Drain Trap and Lines." If the
drain trap and drain line will be exposed to temperatures near or
below freezing, adequate measures must be taken to avoid
condensate from freezing.
Leveling
Leveling ensures proper condensate drainage from the heat
exchanger and induced draft blower. For proper flue pipe
drainage, the furnace must be level lengthwise from end to end.
The furnace should also be level from back to front, or have a
slight tilt with the access doors sloping downward ³⁄₄" (1.9 cm)
lower than the back panel. The slight tilt allows the heat
exchanger condensate, generated in the recuperator coil, to flow
forward to the recuperator coil front cover.
Alternate Vent/Flue Connections
In horizontal installations, provisions for alternate flue piping are
available for counterflow furnaces with right air discharge. This
configuration allows the flue piping to be run vertically through
the furnace. See "Recommended Installation Positions"
illustrations for further details. The standard piping connections
may also be used in these positions. See "Vent/Flue Pipe and
Combustion Air Pipe" for details concerning the conversion to
the alternate vent/flue connections.
When using the horizontal alternate vent configuration, you must
use the RF000142 vent drain kit. See "Alternate Flue/Vent
Location" illustration.
NOTE: Alternate vertical piping connections cannot be used
when an upflow furnace is installed with the supply air
discharging to the right, or when a counterflow furnace is
installed with the supply air discharging to the left. In either case,
use the standard flue and combustion air piping connections.
Alternate Flue/Vent Location
A
B
C
A. Vent/Drain
B. Airflow
C. Field supplied drain hose
NOTES:
The field supplied drain hose is connected from the vent/
drain connection to the condensate drain line with a field
supplied connector.
Make a small loop in the drain hose to serve as a P-trap.
8
Alternate Electrical and Gas Line Connections
This furnace has provisions allowing for electrical and gas line
connections through either side panel. In horizontal applications,
the connections can be made either through the top or bottom of
the furnace.
Freeze Avoidance
See "Horizontal Applications and Conditions—Drain Trap and
Lines."
Furnace Suspension
If suspending the furnace from rafters or joists, us ³⁄₈" (1 cm)
threaded rod and 2" x 2" x ¹⁄₈" (5.1 cm x 5.1 cm x 3.2 mm) angle
iron as shown in the "Suspended Furnace" illustration. The length
of the rod will depend on the application and the clearances
necessary.
Suspended Furnace
A
H
G
F
E
A. ³⁄₈ " (1 cm) diameter threaded
rod (6)
B. 8" (20.3 cm) minimum clearance
between center rod and furnace
cabinet to allow for circulator
blower removal.
C. Level furnace end to end, slight
forward tilt with front 0" to ³⁄₄ "
(1.9 cm) below back.
Ductwork Requirements
Install all conditioned air plenums, ducts and air filters (if not
provided on the furnace) in accordance with NFPA 90B
Standard for the Installation of Warm Air Heating and Air-
Conditioning Systems (latest edition).
The furnace is provided with flanges for the connection of the
plenum and ducts.
All air filters must be listed as Class 2 furnace air filters.
All ductwork must be made of materials and insulated to
meet local, state and national codes. Ductwork installed
outdoors must be sealed, weatherproof and kept from
physical damage. Caulking, flashing or other means of
adequately providing a permanent weather seal should be
used where duct penetrates a building or structure opening.
A closed return duct system must be used with the return
duct connected to the furnace.
B
C
D
D. Tilt outward to allow for door
and circulator blower removal.
E. Position as close as possible to
blower deck to allow for
circulator blower removal.
F. 2" x 2" x ¹⁄₈ " (5.1 cm x 5.1 cm x
3.2 mm) angle iron (3)
G. Support nuts
H. Hold down nuts
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