Side-Wall Direct Venting; Air For Combustion; General; Contaminated Combustion Air - Dettson OLR105A12D Mode D'emploi

Flue pipe sizing
The following table is an excerpt from the Installation Code
and indicates the permitted flue sizes and minimum base
temperatures for circular flues in chimneys with a thermal
resistance of less than R6 (6 ft
Where a new appliance, burner, or chimney is installed,
chimney vent sizes and maximum flue gas temperatures
shall comply with Table 2 (measured at the chimney
connector with the barometric damper shut, after 5 minutes
of operation).
CAUTION
When the furnace (chimney installation) is vented
together with other combustion appliances such as a
water heater, the allowable venting materials for use
with those appliances must be investigated ("L"-vent,
etc.).
WARNING
POISONOUS CARBON MONOXIDE GAS HAZARD.
Never install a hand operated damper in the vent pipe.
However, any Underwriters
electrically operated automatic type vent damper may be
installed if desired. Be sure to follow the instructions
provided with vent damper. Read and follow all
instructions in this section.
Failure to properly vent this furnace or other appliances
can result in death, personal injury and/or property
damage.
Note: Thermal resistance values for typical chimneys are as
follows:
•hr •°F / Btu): Clay-lined masonry, A-vent
2
R2 (2 ft
•hr •°F / Btu): Metal liner in clay-lined masonry
2
R3 (3 ft
•hr •°F / Btu): Metal or clay-lined masonry with
2
R6 (6 ft
R4.5 (4.5 ft
between liner and masonry (e.g. 2"
of expanded mica or 1 3/8" of high
density glass fibreboard.)
Applying Table 2
Total input rating of all
connected appliances
kW BTU/h USGPH
21 70000 0.50
27 91000 0.65
31 105000 0.75
36 119000 0.85
41 140000 1.00
51 175000 1.25
Heat Recovery Ventilation Systems (HRVS) are gaining in
popularity. HRVS are not designed to supply combustion air.
If not properly balanced, a serious negative pressure
condition could develop in the dwelling.
•hr •°F / Btu).
2
Laboratories listed
•hr •°F / Btu) insulation
2
Table 2 :
Inside diameter of flue
Min. Max.
7.62 cm (3") 12.70 cm (5")
7.62 cm (3") 12.70 cm (5")
10.16 cm (4") 12.70 cm (5")
10.16 cm (4") 12.70 cm (5")
10.16 cm (4") 15.24 cm (6")
10.16 cm (4") 15.24 cm (6")
If a furnace with a 0.60 USGPH nozzle is to be connected to
a 6.1 m (20') tall clay-lined masonry chimney, the thermal
resistance of this type of chimney is R2, (which is less than
R6). The actual firing rate at 156 psig is 1.25 x .60 = .75
USGPH. Therefore this table shall apply as follows:
a. The minimum size permitted shall be 10.16 cm (4") in.
inside diameter;
b. The maximum size permitted shall be 12.70 cm (5")
inside diameter;
c. The minimum base temperature shall be about 160°C
(320°F).
2.4.3

Side-wall direct venting

The furnace is approved with a direct vent system. The
system includes a vent terminal model VTK-53 or VTK-64
and an isolated flex vent IFV-310, IFV-315, IFV-320, IFV-
410, IFV-415 or IFV-420 model. Please refer to installation
instructions accompanying the venting system for details.
2.5

AIR FOR COMBUSTION

POISONOUS CARBON MONOXIDE GAS HAZARD.
Comply with NFPA or CSA standards for the installation
of Oil Burning Equipment and applicable provisions of
local building codes to provide combustion and
ventilation air.
Failure to provide adequate combustion and ventilation
air can result in death or personal injury.
2.5.1

General

Oil furnaces must have an adequate supply of combustion
air. It is common practice to assume that older homes have
sufficient infiltration to accommodate the combustion air
requirements for the furnace. However, home improvements
such as new windows, doors, and weather stripping have
drastically reduced the volume of air infiltration into the
home.
Home air exhausters are common. Bathroom and kitchen
fans, power vented clothes dryers and water heaters all tend
to create a negative pressure in the home. Should this occur
the chimney becomes less and less effective and can easily
downdraft.
Flue pipe sizing
Minimum base temperature according to chimney height :
11' 20'
149°C (300°F) 204°C (400°F)
135°C (275°F) 171°C (340°F)
127°C (260°F) 160°C (320°F)
121°C (250°F) 149°C (300°F)
107°C (225°F) 149°C (300°F)
116°C 240°F) 135°C (275°F)
2.5.2

Contaminated Combustion Air

Installations in certain areas or types of structures will
increase the exposure to chemicals or halogens which may
harm the furnace. These instances will require that only
outside air be used for combustion. The following areas or
types of structures may contain or be exposed to certain
substances, potentially requiring outside air for combustion:
6
WARNING
28'
279°C (535°F) 385°C (725°F)
221°C (430°F) 279°C (535°F)
193°C (380°F) 246°C (475°F)
179°C (355°F) 221°C (430°F)
185°C (365°F) 221°C (430°F)
160°C (320°F) 185°C (365°F)
36'