Contact
the
alternate
power
supply
manufacturer
for
specifications and details.
7
VENTING AND COMBUSTION
AIR PIPING
WARNING
CARBON-MONOXIDE POISONING HAZARD
Failure to follow instructions could result in severe
personal injury or death due to carbon-monoxide
poisoning, if combustion products infiltrate into the
building.
Check that all openings in the outside wall around
the vent (and air intake) pipe(s) are sealed to prevent
infiltration of combustion products into the building.
Check that furnace vent (and air intake) terminals are
not obstructed in any way, regardeless of outdoor
conditions.
WARNING
Corrosive or contaminated air may cause failure of parts
containing flue gas, which could leak into the living
space. Air for combustion must not be contaminated by
halogen compounds, which include fluoride, chloride,
bromide and iodide.
These elements can corrode
the heat exchanger and burner cabinet component.
This conditions would shorten the furnace life.
Air
contaminants are found in aerosol sprays, detergents,
bleaches, cleaning solvents, salts, air fresheners, and
other household products. Do not install the furnace in
a corrosive or contaminated atmosphere. Make sure all
combustion and circulating air requirements are met, in
addition to all local codes and ordinances.
7.1
GENERAL
These furnaces are certified as either direct vent (two pipe) or
non-direct vent (single pipe).
If this furnace replaces a furnace that was connected to a vent
system or chimney, the vent may need to be re-sized.
An abandoned masonry chimney may be used as a raceway
for properly insulated and supported combustion air (when
applicable) and vent pipes. If more than one furnace is installed,
they must have their own set of combustion air and vent pipes
and be terminated individually. 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 of 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.
For Canadian Installations, field supplied PVC venting materials
must be UL S636 listed. This requirement does not apply to the
combustion air pipe.
Below are important information that needs to be considered
when installing the venting system:
• The vent pipe and combustion air pipe must of be the
same diameter.
• Slope horizontal vent piping upward a minimum of 1/4"
per foot of run so that condensate drains toward the
furnace.
• Support horizontal vent piping at least every five feet. No
sags or dips are permitted.
• The vent pipe and combustion air pipe must terminate on
the same building side.
• Provide
the
space
with
sufficient
air
for
proper
combustion using permanent pipe (direct-vent) or
opening(s) directly communicating with the outdoors (non
directe vent).
• Insulate all vent runs through unconditioned spaces
where below-freezing temperatures are expected with 1"
thick medium-density, foil-faced fiberglass. (In Canada,
per the vent manufacturer’s instructions)
• For runs where condensate could accumulate and freeze
(including vent termination), wrap the vent pipe with
self-regulating 5 Watt heat tape. The heat tape must
be U.L./CSA. listed and installed per the manufacturer’s
instructions.
• The combustion air and exhaust terminations must be at
least 12” above grade/expected level of snow.
• Ensure the location of the combustion air inlet with
respect to the exhaust vent terminal complies with Figure
29 and local codes.
7.2
DIRECT VENT
When this furnace is installed as a direct vent (2 pipes) furnace,
no special provisions for combustion air are required.
Direct vent installations require a dedicated combustion air and
exhaust vent piping. The system is only using outside air for
combution.
The vent and combustion air pipe can terminate vertically,
through the roof or horizontaly through and outside wall. Refer
to figures for approved termination.
Penetration throught a roof requires appropriate sealing and
proper flashing.
In Canada
, refer to manufacturer’s instructions for supporting
ULC S636 venting. ABS can be used for the combustion air
pipe.
7.3
NON DIRECT VENT
All air for combustion comes directly to the furnace from a
space that is well ventilated with outdoor air (such as an attic or
crawlspace). In addition, other gas appliances installed in the
space with the furnace may require outside air for combustion.
The combustion air pipe cannot be terminated in attics or
crawlspaces that uses ventilation fans designed to operate
during the heating season. If ventilation fans are present in
these areas, the combustion pipe must terminate outdoors as a
direct vent (2 pipe) system.
18
Summary of Contents for C105-2-V
Page 24: ...Figure 29 Direct vent clearance 23 ...
Page 25: ...Figure 30 Other than Direct vent clearance 24 ...
Page 32: ...Figure 31 Dimensions 31 ...
Page 33: ...Figure 32 Two Stage ECM Wiring diagram 32 ...
Page 36: ...Figure 33 Exploded view Cxx 2 V part 1 35 ...
