J801X Installation Manual

8
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.
WARNING:
Upon completion of the furnace installation,
carefully inspect the entire flue system both
inside and outside the furnace to assure it is
properly sealed. Leaks in the flue system can
result in serious personal injury or death due
to exposure of flue products, including carbon
monoxide.
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 must be vented in compliance with
the current revision of the National Fuel Gas Code
(ANSI-Z223.1/NFPA54) and the instructions provided
below. Refer to the NFGC for approved vent tables.
Consult local codes for special requirements.
• 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.
• In the U.S., this furnace must never be vented to a
chimney or flue that services a fireplace or other
appliance designed to burn solid fuel. If the furnace
vent is to be connected to a chimney serving a fireplace,
the fireplace must be sealed off from 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 fire rate.
The MIN capacity must be lower than the low fire rate. If
the venting system is inappropriate for the furnace, the
venting system will need to be modified to comply with
NFGC or local codes.The minimum diameter of any
vent pipe is 4 inches.
• 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 five 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.
• 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 fiberglass of one inch
minimum thickness.
• Sheet metal fasteners should be used to secure the vent
pipe to the furnace flue. However, the NFGC states 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.
Flexible Vent Systems
Flexible venting systems are approved for use providing
they are listed for the application and meet all local Code
requirements. These systems are primarily used to line
existing masonry chimneys. They must be sized to the
application according to the sizing tables in the National
Fuel Gas Code, including the required 20% reduction in
maximum capacity.
Flexible venting systems are permitted to be used as the
vent connector. However, great care must be taken to ensure
that there are no sags in the venting system which could
accumulate condensate. The flexible vent system must be
supported at no more than 5 foot intervals and maintain a
minimum slope of ¼ inch per foot of horizontal run.