Nordyne 045C-23ASA, Installation Instructions Manual

Page: 12 / 36

12
VENTING REQUIREMENTS
WARNING:
Upon completion of the furnace installation,
carefully inspect the entire fl ue system both
inside and outside the furnace to assure it is
properly sealed. Leaks in the fl ue system can
result in serious personal injury or death due
to exposure of fl ue products, including carbon
monoxide.
• This furnace must be vented in compliance with
the current revision of the National Fuel Gas Code
(ANSI-Z223.1/NFPA54) and the instr uctions
provided below.
Consult local codes for special
requirements.
• In Canada, venting shall conform to the requirements of
the current (CAN/CGA B149.1 or .2) installation codes.
Consult local codes for special requirements.
• Additional reference information for US and Canadian
installations can be found in the Combustion and
Ventilation Air section (page 4).
Category I Venting
This furnace is listed as a Category I vented appliance.
Category I furnaces generally operate with a slight
negative pressure (draft) and must be vented vertically or
near vertical. Additionally it is important to guard against
excessive condensation.
• Category I furnace installations must be connected to a
factory built chimney or vent complying with a recognized
standard, or a masonry or concrete chimney lined with
a lining material acceptable to the authority having
jurisdiction.
WARNING:
Venting into an unlined masonry chimney or
concrete chimney is prohibited. This may result
in improper draft and excess condensation
forming in the chimney.
• This furnace may be vented with a dedicated venting
system or common vented with other Category I
appliances. The vent system dimensions and material
must conform to the NFGC or local Codes. Generally,
this means using Type B vent pipe or a lined masonry
chimney. When consulting the vent sizing tables in the
NFGC, the MAX capacity of the vent must be greater
than the furnaces high fi re rate. The MIN capacity must
be lower than the low fi re rate. If the venting system is
inappropriate for the furnace, the venting system will need
to be modifi ed to comply with NFGC or local codes.
• The venting system should be designed to have the
minimum number of elbows or turns. All horizontal runs
shall slope upwards from the furnace at ¼ inch per
running foot of vent. Supports for the vent pipe must
be installed a minimum of every fi ve feet along the vent
run to ensure no displacement after installation.
Under
no circumstances shall any portion of the vent system
extend into or pass through any return air duct, supply
air duct, or plenum.
• Single wall vent connectors may be used under the
limited capacity ranges found in the vent sizing tables.
It is recommended that Type B double wall vent be
used for the connector whenever possible. An existing
masonry chimney should be inspected and relined if
necessary.
• In the U.S., this furnace must never be vented to
a chimney or fl ue that services a fi replace or other
appliance designed to burn solid fuel. If the furnace
vent is to be connected to a chimney serving a fi replace,
the fi replace must be sealed off from the chimney. In
Canada, common venting with a fi replace is permitted.
Consult B149.1 and your local code authority.
• Single wall metal vertical vents shall not be used for
Category I venting. The furnace vent, if metal, may be
insulated if local codes allow. Any part of the vent system,
metal vent only, not exposed to weather, but which are
exposed to temperatures below 35° F (1°C) must be
insulated to prevent condensation. All vent insulation
shall be foil backed fi berglass of one inch minimum
thickness.
• Sheet metal fasteners should be used to secure the vent
pipe to the furnace fl ue. However, the NFGC lists that
alternative vent products may be attached according to
the vent manufacturers instructions.
• When an existing furnace is removed from a vent system
serving other appliances, the existing vent system may no
longer be sized to properly vent the remaining appliances.
An improperly sized venting system can result in the
formation of condensate, leakage, or spillage. The
existing vent system should also be checked to make
sure it remains in compliance with NFGC. If it isn’t, the
vent system must be brought into compliance before
installing the furnace.