Venting - Lennox SL280UHNV Installation Instructions Manual

This reverse flow of the flue gas may result in incomplete
combustion and the formation of carbon monoxide gas.
This toxic gas might then be distributed throughout the
house by the furnace duct system.
In upflow applications, the return air can be brought in
through the bottom or either side of the furnace. If a fur-
nace with bottom return air is installed on a platform, make
an airtight seal between the bottom of the furnace and
the platform to ensure that the unit operates properly and
safely. Use fiberglass sealing strips, caulking, or equiva-
lent sealing method between the plenum and the furnace
cabinet to ensure a tight seal. If a filter is installed, size the
return air duct to fit the filter frame.

Venting

A 4-inch diameter flue transition is factory-installed on the
combustion air inducer outlet of all models.
The SL280UHNV series units are classified as fan-assist-
ed Category I furnaces when vertically vented according
to the latest edition of National Fuel Gas Code (NFPA 54
/ ANSI Z223.1) in the USA. A fan-assisted Category I fur-
nace is an appliance equipped with an integral mechan-
ical means to either draw or force combustion products
through the combustion chamber and/or heat exchanger.
The SL280UHNV is not approved for use with horizontal
venting.
NOTE - Use these instructions as a guide. They do not
supersede local codes. This furnace must be vented ac-
cording to all local codes these installation instructions,
and the provided venting tables in these instructions
The venting tables in this manual were extracted from the
National Fuel Gas Code (NFPA 54 / ANSI Z223.1) and are
provided as a guide for proper vent installation. Proper
application, termination, construction and location of vents
must conform to local codes having jurisdiction. In the ab-
sence of local codes, the NFGC serves as the defining
document.
Refer to the tables and the venting information contained
in these instructions to properly size and install the venting
system.
IMPORTANT
Once the venting system is installed, attach the
"Disconnected Vent" warning sticker to a visible area
of the plenum near the vent pipe. See Figure 15. The
warning sticker is provided in the bag assembly. Order
kit 66W04 for additional stickers.
WARNINg
Asphyxiation hazard. The exhaust vent for this furnace
must be securely connected to the furnace flue transition
at all times.
VENT PIPE
(min. 6" length)
FLUE TRANSITION
COLLAR
"DISCONNECTED VENT"
Use self-drilling sheet metal screws or a mechanical fas-
tener to firmly secure the vent pipe to the round collar of
the flue transition. If self-drilling screws are used to attach
the vent pipe, it is recommended that three be used. Drive
one self-drilling screw through the front and one through
each side of the vent pipe and collar. Install the first vent
connector elbow at a minimum of six inches (152 mm)
from the furnace vent outlet. See Figure 15.
Venting Using a Masonry Chimney
The following additional requirements apply when a lined
masonry chimney is used to vent this furnace. Masonry
chimneys used to vent Category I central furnaces must
be either tile-lined or lined with a listed metal lining sys-
tem or dedicated gas vent. Unlined masonry chimneys
are prohibited. See Figure 16 and Figure 17 for common
venting.
A chimney with one or more sides exposed to the outside
of the structure is considered to be an exterior chimney.
An exterior masonry chimney that is not tile-lined must be
lined with B1 vent or a listed insulated flexible metal vent.
An exterior tile-lined chimney that is sealed and capped
may be lined with a listed uninsulated flexible metal vent.
If the existing chimney will not accommodate a listed met-
al liner, either the chimney must be rebuilt to accommo-
date one of these liners or an alternate approved venting
method must be found.
Insulation for the flexible vent pipe must be an encapsu-
lated fiberglass sleeve recommended by the flexible vent
pipe manufacturer. See Figure 16.
Page 13
VENT CONNECTION UPFLOW
AND HORIZONTAL POSITION
"DISCONNECTED VENT"
WARNING
STICKER
WARNING
STICKER
FLUE
TRANSITION
VENT PIPE
(min. 6" length) COLLAR
FIgURE 15