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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 gasses 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 either be of double
wall construction, or be of single wall construction insulated with 1" of
insulation.
CAUTION
When the furnace (chimney installation) is co-vented
with other combustion appliances such as a water
heater, the allowable venting materials (i.e. L -Vent etc.)
for use with those appliances should also be
investigated.
Flue pipe sizing:
The following table is an except from the installation code and
indicates permitted flue sizes and minimum base temperatures for
circular flues in chimney with thermal resistance less than R6 (6 ft
•°F / Btu). Where a new appliance, burner, or chimney is installed,
chimney vent sizes and flue-gas temperatures (measured at the
chimney connector with the barometric damper shut, if applicable,
after 5 minutes of operation) shall comply with the table #2.
Total input rating of all
connected appliances
kW
kBtu/h
21
70
27
91
31
105
36
119
41
140
51
175
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 ventor using the new DV -2000™ venting system with the high
static pressure Beckett AFII and Riello 40-BF oil burners. Outdoor
combustion air must be directly connected to the burner of the
DV-2000™ venting system w ill not function.
The notable characteristics of the DV-2000™ system are as follows:
1.
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.
2.
One hole of minimal size (6") is required to be cut in the side-
wall, and the terminal is designed to fit through a minimum 2 X 8
joist space.
3.
Incorporates a vent blockage safety shutdown system. If the vent
or intake opening ever becomes partially or fully blocked, the
burner will shut down before a #1 smoke occurs.
4.
The intake and vent circuits within the terminal can be accessed
for cleaning.
There are 3 main components to the DV -2000™ system; the VTK vent
terminal kit, the IFV insulated flexible venting material and the field-
supplied 3" PVC or ABS intake piping.
6
2
Flue inside diameter (in)
USGPH
Min.
0.50
3
0.65
3
0.75
4
0.85
4
1.00
4
1.25
4
NOTES: Thermal resistance values for typical chimneys are as
follows:
•hr •°F / Btu):
2
R2 (2 ft
•hr •°F / Btu):
2
R3 (3 ft
•hr •°F / Btu):
2
R6 (6 ft
Applying the Table:
If a furnace with 0.60 USGPH nozzle is to be connected to a 20 ft. tall
clay-lined masonry chimney, the thermal resistance of this chimney
type is R2, which is less than R6. The actual firing rate at 156 psig is
1.25 x .60 = .75. Therefore this table shall apply as:
The minimum size permitted shall be 4 in. inside diameter.
The maximum size permitted shall be 5 in. inside diameter.
•hr
The minimum base temperature shall be about 320ºF.
TABLE # 2
Minimum base temperature (ºF)
Max.
11
5
300
5
275
5
260
5
250
6
225
6
240
!
Poison carbon monoxide gas hazard
Even though the flexible venting is insulated, it
cannot be run through an unheated space.
To do so could cause residual condensation inside
the stainless steel liner, which may eventually
perforate the liner and allow vent gasses to enter
the dwelling.
Vent terminal kits – DV-2000™:
The certified standard vent terminal kit is Model No. VTK-1 or VTK-2,
and is suitable for installation in walls up to 14" thick. An alternate kit,
Model VTK-1-DW or VTK-2-DW is available to accommodate walls up
to 25" thick. Both kits contain the following items to complete the hook-
up to the venting and furnace:
1
Terminal
2
Sealing Clamps
1
Side-wall Venting Breech Plate
2
Sealing Strips
1
Inner Wall Plate
1
Pressure Control with Tubing
clay-lined masonry, A-vent
metal liner in clay-lined
Masonry
metal or clay-lined masonry
•hr •°F / Btu)
2
with R4.5 (4.5 ft
insulation between liner and
masonry (e.g. 2 in. of
expanded mica or 1 3/8 in. of
high density glass fibreboard.)
for chimney height (ft) of :
20
28
400
535
340
430
320
380
300
355
300
365
275
320
WARNING
WARNING
36
725
535
475
430
430
365
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