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Without a barometric damper
Due to the lack of dilution air that would ordinarily be drawn into the
barometric damper, the dew point of the flue gases is raised. To offset
the increased tendency for vent condensation, the chimney must be
lined. The liner must be insulated according to the insulating
procedure recommended by the manufacturer of the liner. Also, the
vent connector should be as short as possible and be either of double
wall construction or of single wall construction with 2.5 cm (1") of
insulation.
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.).
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
2
•hr •°F / Btu). Where a new appliance, burner, or chimney is
ft
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).
Note: Thermal resistance values for typical chimneys
are as follows:
•hr •°F / Btu):
2
R2 (2 ft
Clay-lined masonry, A-vent
•hr •°F / Btu):
2
R3 (3 ft
Metal liner in clay-lined
Masonry
2
•hr •°F / Btu):
R6 (6 ft
Metal or clay-lined masonry
with R4.5 (4.5 ft
insulation between liner and
masonry (e.g. 2" of expanded
mica or 1 3/8" of high density
glass fibreboard.)
Applying Table 2
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:
The minimum size permitted shall be 10 cm (4") in. inside diameter;
The maximum size permitted shall be 13 cm (5") inside diameter;
The minimum base temperature shall be about 160°C (320°F).
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
6
•hr •°F / Btu)
2
TABLE 2
Inside diameter of flue
Min.
Max.
7.6 cm (3")
13 cm (5")
7.6 cm (3")
13 cm (5")
10 cm (4")
13 cm (5")
10 cm (4")
13 cm (5")
10 cm (4")
15 cm (6")
10 cm (4")
15 cm (6")
1.4.3
Side-wall venting - DV-2000™
Direct Vent System
The furnace can be side-wall vented, without the use of a side-wall
power vent, with the high static pressure Beckett AFII and Riello 40-
BF oil burners. Outdoor combustion air must be directly
connected to the burner or the DV-2000™ venting system will not
function.
The notable characteristics of the DV-2000™ system are as follows:
a)
Certified to use the following materials for ducting the intake air
from the terminal to the burner: Schedule 40 PVC DWV,
Schedule 40 ABS DWV, and ASTM 2729 sewer Pipe;
One hole of minimal size 15 cm (6") is required to be cut into the
b)
side-wall, and the terminal is designed to fit through a minimum
2 x 8 joist space;
Incorporates a vent blockage safety shutdown system. If the vent
c)
or intake opening ever becomes partially or fully blocked, the
burner will shut down before a #1 smoke condition occurs;
d)
The intake and vent circuits within the terminal can be accessed
for cleaning.
There are 3 main components to the DV-2000™ system; the vent
terminal kit VTK-1 (for models OLB5-R/F, OHB5F, OLF/R105,
OUF105, NOUF105 and NOLF105) or VTK-2 (for models OLB6,
OHB6, OLR160, OUF160) and the insulated flexible venting material.
IFV3 (for models OLB5-R/F, OHB5F, OLF/R105, OUF105, NOUF105,
NOLF105) or IFV4 (for models OLB6, OHB6, OLR160, OUF160) and
the field-supplied 3" PVC or ABS intake piping.
WARNING
Poisonous carbon monoxide gas hazard.
Even though the flexible venting is insulated, it
must not be run through an unheated space.
To do so can cause residual condensation inside
the stainless steel liner. This may eventually
perforate the liner and allow vent gasses to enter
the dwelling, which can result in death, personal
injury and/or property damage.
Insulated flexible venting - DV-2000™
The certified venting materials come in 3 lengths, Model No. IFV3-15,
IFV3-23 and IFV3-30 or IFV4-15, IFV4-23 and IFV4-30 for 160 models
correspond to 15, 23 and 30' of continuous lengths of vent. The vent
construction is coaxial and incorporates a stainless steel corrugated
flexible liner surrounded by a thick insulation blanket and covered with
an outer layer of flexible corrugated aluminium sleeve to protect the
insulation. Splicing vent lengths together is prohibited. The
maximum and minimum continuous vent lengths permitted for
installation are:
1.5 m (5') minimum
9 m (30') maximum
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)
28'
36'
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)
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