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F96CTN and G96CTN (Series A): Installation, Start-up, Operating, Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
30
General
If this furnace replaces a furnace that was connected to a vent system or
chimney, the vent or vent connectors of other remaining appliances may
need to be re-sized. Vent systems or vent connectors of other appliances
must be sized to the minimum size as determined using appropriate table
found in the current edition of National Fuel Gas Code NFPA 54/ANSI
Z-223.1. In Canada, refer to CAN/CSA-B149.1.
An abandoned masonry chimney may be used as a raceway for properly
insulated and supported combustion-air (when applicable) and vent
pipes. Each furnace must have its own set of combustion-air and vent
pipes and be terminated individually, as shown in
(2-Pipe) system, or
for single-pipe or ventilated combustion air
option.
A furnace shall not be connected to a chimney flue serving a separate
appliance designed to burn solid fuel.
Other gas appliances with their own venting system may also use the
abandoned chimney as a raceway providing it is permitted by local code,
the current edition of the National Fuel Gas Code, and the vent or liner
manufacturer’s installation instructions. Care must be taken to prevent
the exhaust gases from one appliance from contaminating the
combustion air of other gas appliances.
Do not take combustion air from inside the chimney when using
ventilated combustion air or single-pipe vent option.
These furnaces can be vented as direct-vent (two-pipe), ventilated
combustion air or non-direct (single-pipe) vent system. Each type of
venting system is described below. Common venting between these
furnaces or other appliances is prohibited.
Materials
U.S.A.
Combustion air and vent pipe, fittings, primers, and solvents must
conform to American National Standards Institute (ANSI) standards and
American Society for Testing and Materials (ASTM) standards. See
for approved materials for use in the U.S.A. This furnace is also
CSA approved for venting with M&G DuraVent
R
PolyPro
R
or
Centrotherm InnoFlue
R
polypropylene venting systems using single
wall straight and flex, and required fittings (elbows, reducers, increasers,
connectors, adapters) only.
Canada
Special Venting Requirements for Installations in Canada, Installation in
Canada must conform to the requirements of CAN/CSA B149 code.
Vent systems
must
be composed of pipe, fittings, cements, and primers
listed to ULC S636. M&G DuraVent
R
PolyPro
R
or Centrotherm
InnoFlue
R
polypropylene venting systems are ULC S636 listed.
NOTE:
When using polypropylene venting systems, all venting
materials used, including the vent terminations must be from the same
manufacturer.
A12220
Fig. 40 – Sample Inlet Air Pipe Connection for Polypropylene
Venting Systems
Venting Systems
Direct Vent / 2-Pipe System
In a direct-vent (2-pipe) system, all air for combustion is taken directly
from outdoor atmosphere, and all flue products are discharged to outdoor
atmosphere. Combustion-air and vent pipes must terminate together in
the same atmospheric pressure zone, either through the roof (preferred)
or a sidewall. See
for references to clearances required by
National code authorities.
Ventilated Combustion Air Systems
In a ventilated combustion air option, the vent terminates and discharges
the flue products directly to the outdoors similar to a direct vent system.
See
for references to clearances required by National code
authorities.
All air for combustion is piped directly to the furnace from a space that is
well ventilated with outdoor air (such as an attic or crawl space) and the
space is well isolated from the living space or garage. Combustion air
requirements for this option are the same as the requirements for
providing outside air for combustion for a single pipe vent system. Refer
to the “Air For Combustion and Ventilation” Section.
EXAMPLE FOR
UPFLOW INSTALLATIONS.
MAY BE APPLIED TO
OTHER CONFIGURATIONS.
WARNING
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the instructions outlined below for each appliance
being placed into operation could result in carbon monoxide poisoning
or death.
For all venting configurations for this appliance and other gas
appliances placed into operation for this structure, provisions for
adequate combustion, ventilation, and dilution air must be provided in
accordance with:
U.S.A. Installations
: Section 9.3 of the current edition of NFPA
54/ANSI Z223.1, Air for Combustion and Ventilation and applicable
provisions of the local building codes.
Canadian Installations
: Part 8 of the current edition of
CAN/CSA-B149.1. Venting Systems and Air Supply for Appliances
and all authorities having jurisdiction.
NOTICE
!
RECOMMENDED SUPPORT FOR VENT
TERMINATION
It is recommended that sidewall vent terminations of over 24 inches
(0.6 M) in length or rooftop vent terminations of over 36 inches (1 M)
in length be supported by EITHER the factory accessory vent
termination kit or field-supplied brackets or supports attached to the
structure. A factory accessory vent termination kit may be used for
direct vent terminations. Termination kits are available for 2-in. or 3-in.
NOTICE
!
OPTIONAL CONFIGURATION FOR COMBUSTION
AIR INLET PIPE
In applications where there is a risk of excessive moisture entering the
combustion air inlet pipe, a moisture trap may be added to the inlet pipe
to help prevent moisture from entering the furnace from the combustion
.
When sizing venting systems, the equivalent length of the optional inlet
pipe moisture trap must be taken into account.