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IMPORTANT INFORMATION
• This furnace must be vented in compliance with
the current revision of the National Fuel Gas Code
(ANSI-Z223.1/NFPA54). Instructions for determining
the adequacy of an installation can be found in the
current revision of the NFGC (ANSI Z223.1 / NFPA54).
Consult local codes for special requirements. These
requirements are for US installations as found in
the NFGC.
• Furnace installation using methods other than those
described in the following sections must comply
with the National Fuel Gas Code (NFGC) and all
applicable local codes.
• Requirements in Canada (B149.1) are structured
differently. 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.
• Provisions must be made during the installation
of this furnace that provide an adequate supply of
air for combustion. The combustion air from the
outside needs to be clear of chemicals that can
cause corrosion. The inlet pipe should not be placed
near corrosive chemicals such as those listed on
page
5.
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:
This furnace must not be vented with other
appliances, even if that appliance is of the
condensing type. Common venting can result
in severe corrosion of other appliances or their
venting and can allow combustion gases to
escape through such appliances or vents. Do
not vent the furnace to a fireplace chimney or
building chase.
This condensing furnace is certified for installation either as
a Direct Vent (2-pipe) or Conventional (1-pipe) appliance.
Direct Vent appliances draw combustion air from the
outdoors and vent combustion products back outside.
Installation with air taken from around the furnace is often
referred to as Conventional installation - i.e. only the vent
(exhaust) pipe is provided.
8
Another important consideration when selecting one or
two pipe installation is the quality of the Indoor air which
can sometimes be contaminated with various household
chemicals . These chemicals can cause severe corrosion
in the furnace combustion system. A 2-pipe installation
has the additional advantage that it isolates the system
from the effects of negative pressure in the house.
CAUTION:
Exhaust fans, clothes dryers, fireplaces and
other appliances that force air from the house
to the outdoors can create a negative pressure
inside the house, resulting in improper furnace
operation or unsafe conditions such as flameroll
out. It is imperative that sufficient air exchange
with the outdoors is provided to prevent
depressurization. Additional information about
testing negative pressure problems can be
found in the National Fuel Gas Code.
Air openings on top of the furnace and openings in closet
doors or walls must never be restricted. If the furnace is
operated without adequate air for combustion, the flame
roll-out switch will open, turning off the gas supply to the
burners. NOTE: This safety device is a manually reset
switch. DO NOT install jumper wires across these
switches to defeat their function or reset a switch
without identifying and correcting the fault condition. If
a switch must be replaced, use only the correct sized part
specified in the Replacement Parts List provided online.
Direct Vent Systems
Direct vent appliances draw combustion air from the
outdoors and vent combustion products back outside,
isolating the entire system from the indoor space. It is
important to make sure that the whole system is sealed
and clearances to combustibles are maintained regardless
of the installation being in a confined or unconfined space.
Conventional Vent Systems - Confined
Spaces
A confined space is an area with volume less than 50
cubic feet per 1,000 Btuh of the combined input rates of
all appliances drawing combustion air from that space.
Furnace closets, small equipment rooms and garages are
confined spaces. Furnaces installed in a confined space
which supply heated air to areas outside the space must
draw return air from outside the space and must have
the return air ducts tightly sealed to the furnace. Ducts
must have cross - sectional area at least as large as
the free area of their respective openings to the furnace
space. Attics or crawl spaces must connect freely with
the outdoors if they are the source of air for combustion
and ventilation.
The required sizing of these openings is determined by
whether inside or outside air is used to support combustion,
the method by which the air is brought to the space, and
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