Allied Air A80UH1E Installation Instructions Manual page 14

These series units are classified as fan assisted 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 furnace is an appliance
equipped with an integral mechanical means to either draw
or force combustion products through the combustion
chamber and/or heat exchanger. This unit 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
according 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
absence 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 23. The
warning sticker is provided in the bag assembly. Order
kit 66W04 for additional stickers.
Asphyxiation hazard. The exhaust vent for this
furnace must be securely connected to the furnace flue
transitiion at all times.
Vent Connection
Figure 23
Page 14 of 34
WARNING
Use self drilling sheet metal screws or a mechanical fastener
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. See Figure 23.
Install the first vent connector elbow at a minimum of six
inches (152 mm) from the furnace vent outlet. See Figure
23.
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
system or dedicated gas vent. Unlined masonry chimneys
are prohibited. See Figures 24 and 25 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 metal
liner, either the chimney must be rebuilt to accommodate
one of these liners or an alternate approved venting method
must be found.
Insulation for the flexible vent pipe must be an encapsulated
fiberglass sleeve recommended by the flexible vent pipe
manufacturer.
Common Venting Using Metal Lined
NOTE 1: Refer to the provided venting tables for installations.
Refer to the capacity requirements shown in the provided venting
tables.
Issue 1624
Masonry Chimney
Figure 24
507330-01