F96CTN and G96CTN (Series A): Installation, Start-up, Operating, Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
31
Non-Direct Vent (1-pipe) System
In a non direct-vent (1-pipe) system, all air for combustion is taken from
the area adjacent to furnace, and all flue products are discharged to
outdoor atmosphere. Air for combustion must be supplied as described
in the Air For Combustion and Ventilation Section. Do not use an
abandoned chimney to supply outside air to the furnace. See
references to vent clearances required by National code authorities.
A combustion air pipe to the outdoors is not required for a single-pipe
vent system. A 12-in. (304 mm) long pipe with a 2-in. (51 mm) tight
radius 90 degree elbow is
required
to be attached to the combustion air
pipe adapter on the furnace. See
. This short inlet air pipe helps to
ensure stable combustion, as well as allow for sound attenuation. To aid
sound attenuation, point the inlet air pipe away from occupants. An extra
elbow and/or five feet of pipe may be used to accomplish the sound
attenuation function.
A13305
Fig. 41 – Combustion Air and Vent Pipe Termination for Direct Vent (2-Pipe) System
Table 11 – Vent Termination Kit for Direct Vent (2-pipe) Systems
NOTICE
!
OPTIONAL VENTING BELOW THE FURNACE
The venting system may be positioned below the furnace
ONLY
IF the
factory accessory External Vent Trap Kit is used. The External Vent
Trap Kit is only approved for PVC/ABS DWV venting systems.
CAREFULLY FOLLOW THE INSTRUCTIONS PROVIDED
WITH THE EXTERNAL VENT TRAP KIT FOR LAYING OUT
THE VENTING SYSTEM AND THE DRAIN SYSTEM.
The
instructions included with this furnace
DO NOT APPLY
to vent
systems that are located below the furnace.
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the instructions outlined below for each appliance
being placed into operation could result in carbon monoxide poisoning
or death.
The instructions included with this furnace
DO NOT APPLY
to vent
systems that are located below the furnace.
CAREFULLY FOLLOW
THE INSTRUCTIONS PROVIDED WITH THE EXTERNAL
VENT TRAP KIT FOR LAYING OUT THE VENTING SYSTEM
AND THE DRAIN SYSTEM
when all or part of the venting system is
placed below the furnace.
Proper configuration of the venting and drain system is critical when
placing all or part of the venting system below the level of the furnace.
VENT GASSES COULD BE RELEASED FROM THE
DRAINAGE SYSTEM
if the instructions provided with the External
Vent Trap Kit are not followed.
Vent and Combustion
Air Pipe Diameters
Approved Two-Pipe Termination Fittings
Allowable Concentric
Vent Kit
1 1/2-in. (38 mm)
2-in. (51 mm)
2 1/2-in.
(64 mm)
3-in.
(76-mm)
4-in.
(102 mm)
1 1/2-in. (38 mm)
No
Yes
No
No
No
2-in. (51 mm)
2-in. (51 mm)
No
Yes
No
No
No
2-in. (51 mm)
2 1/2-in. (64 mm)
No
No
No
Yes
No
2-in. (51 mm)
3-in. (76 mm)
3-in. (76-mm)
No
No
No
Yes
No
3-in. (76 mm)
4-in. (102 mm)
No
No
No
Yes
Yes
3-in. (76 mm)
LQPPIRULQPP
12 in. (305mm) min. separation
between bottom of combustion
air and bottom of vent (Typ.)
LQPPIRULQPP
