Dettson Chinook C15-M-V Instructions D'installation Et Manuel Du Propriétaire page 20

7 VENTING AND COMBUSTION
AIR PIPING
WARNING
CARBON-MONOXIDE
Failure to follow instruction 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 during all seasons.
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
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 appliance must
be sized to the minimum size allowable.
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.
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
POISONING HAZARD
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.
• The vent pipe and combustion air pipe must 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.
• Installation of self regulating 5 or 7 watt heating
cable at the termination of venting could be a
necessity if ice build up is expected. See section
7.2.
7.2 VENT/EXHAUST BLOCKAGE
DUE TO ICE BUILD UP
If outdoor design conditions are -8°F (-22°C) or
less and furnace maximum input is equal or lower
than 45 000 BTU/hr, there is a high risk of ice
blockage at the vent termination. Provision for
heating cable at the exhaust should be made
to avoid furnace shut down at the most critical
temperatures.
If your furnace has a maximum input of 45 000 BTU/hr
and if design outdoor conditions are –8°F (-22°C) or
less, this section should be thoroughly considered before
final installation of the furnace. Dettson is proud to offer
one of the most efficient furnaces (+97% AFUE) on the
market as well as being the only supplier of perfectly
sized furnace in terms of footprint and input.
energy supplied to the furnace is delivered throughout
the home for the comfort of the occupant rather than
outside. In these installations, residual energy in the
chimney/vent are minimized and flue gases are expelled
at low velocity. In some weather conditions, it leads to
condensate freeze up at the termination and the furnace
shuts down because of the ice blockage. To prevent
this phenomenon, Dettson highly suggests installing 5-
watt/ft or 7-watt/ft self-regulating heating cable at the
termination, inside of the pipe. Heating cable must be UL
listed. Dettson recommends installing cable as per figure
16. In the figure, straight venting termination is depicted,
but the insertion pattern remains for eiter of the permitted
termination.
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WARNING
The