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Leveling
Proper leveling of the furnace must be provided to insure proper
drainage of the condensate from the furnace. The furnace must be
1
level to within
/
² from front to back and from side to side for upflow
4
and downflow installations or top to bottom for horizontal installa-
tions.
Vent and Combustion Air Connections
On the Dual Certified furnace, the vent and combustion air pipes
attach to the furnace through the top panel for the upflow and hori-
zontal installations. For the downflow installation, the vent and
Horizontal Furnace Installation
This furnace can be installed horizontally in an attic, basement,
crawl space, alcove, or suspended from a ceiling in a basement or
utility room . See Figure 4. Do not install furnace on its back or in
the reverse airflow positions as safety control operation will be ad-
versely affected.
Typical Horizontal Installation
Figure 4
Inlet Pipe (not used on Single Pipe model)
Vent
Pipe
NOTE: 6² ² ² ² bottom clearance required for condensate trap.
3. Combustion & Ventilation Air
For Single Pipe Installation
!
CARBON MONOXIDE POISONING HAZARD
Failure to provide adequate combustion and ventilation
air can result in death and/or personal injury.
Use methods described here to provide combustion and
ventilation air.
Furnaces require ventilation openings to provide sufficient air for
proper combustion and ventilation of flue gases. All duct or open-
ings for supplying combustion and ventilation air must comply with
National Fuel Gas Code, NFPA54/ANSI Z223.1, 2002 (or current
edition) and applicable provisions of local building codes.
This furnace can NOT be common vented or connected to any type
B, BW or L vent or vent connector, nor to any portion of a factory--
built or masonry chimney. If this furnace is replacing a previously
common-vented furnace, it may be necessary to resize the existing
vent and chimney to prevent oversizing problems for the other re-
maining appliance(s). See "Venting and Combustion Air Check" in
this section. This furnace MUST be vented to the outside.
440 01 1020 02
combustion air pipes attach to the furnace through the alternate
locations on the furnace side panels.
Note: On the Direct Vent furnace, the vent pipe attaches to the fur-
nace through the side panels. The combustion air pipe attaches to
the top panel or to the alternate location on the side panel.
On the Single Pipe furnace, the vent pipe attaches to the furnace
through the furnace side panels.
Note: Repositioning of the combustion blower is required for the
vent pipe connection to the furnace through the "right side" panel.
See "Vent and Combustion Air Piping" section for further details.
If the furnace is to be suspended from the floor joists in a crawl
space or the rafters in an attic, it is necessary to use steel pipe
straps or an angle iron frame to rigidly attach the furnace to prevent
movement. These straps should be attached to the furnace with
sheet metal screws and to the rafters or joists with bolts. The pre-
ferred method is to use an angle iron frame bolted to the rafters or
joists. (Take caution to allow door panels to be removed for mainte-
nance)
If the furnace is to be installed in a crawl space, consult local codes.
A suitable concrete pad or blocks are recommended for crawl
space installation on the ground.
NOTE: 6² bottom clearance required for condensate trap.
Thirty (30) inches between the front of the furnace and adjacent
construction or other appliances MUST be maintained for service
clearance.
Keep all insulating materials clear from louvered door. Insulating
Condensate
materials may be combustible.
Trap
The horizontal furnaces may be installed directly on combustible
wood flooring or supports as long as all required furnace clear-
ances are met. See Figure 4.
This furnace MUST NOT be installed directly on carpeting or tile or
other combustible material other than wood flooring or supports.
For horizontal installation over a finished living space. A field fabri-
25--23--34
cated auxiliary drain pan with drain pipe is required to prevent dam-
age by overflow due to blocked condensate drain.
Air Openings and Connecting Ducts
Confined Space Installation
NOTE: A confined space is defined as an area with less than 50
cubic feet per 1,000 BTUH input rating for all gas appliances
installed in the area.
Requirements
1.
Total input rating for all non direct vent gas appliances MUST
be considered when determining free area of openings.
2.
Connect ducts or openings directly to outside.
3.
When screens are used to cover openings, they MUST be
1
no less than
/
² mesh.
4
4.
The minimum dimension of rectangular air ducts MUST
NOT be less than 3².
5.
When sizing grille or louver, use the free area of opening. If
free area is NOT stamped or marked on grill or louver, as-
sume a 20% free area for wood and 60% for metal.
1.
Provide confined space with sufficient air for proper com-
bustion and ventilation of flue gases using horizontal or verti-
cal ducts or openings.
7
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