Camus Hydronics DFH/W1100 Installation, Operation And Service Manual - page 14
9
equivalent feet (30.5 m) in length. Depending on diameter
and centreline radius subtract from 7 to 19 feet per 90
°
elbow using published data.
Subtract half this value for
each 45° elbow.
•
The flue may terminate either vertically at the roof top or
horizontally on a THRUWALL. See the information about
the specific vent termination location for recommended
location and clearances.
2.1.3
CATEGORY II AND CATEGORY IV VENTING
A Category II or IVventing system for the flue products is
required on all condensing models (DynaFlame® with CHRM).
A Category IIventing system operates with a negative
pressure in the vent.
The Category IVventing system operates withpositive
pressure generated by the internal combustion air fan which
operates the combustion process and also exhausts the flue
products from the building.
•
The Category II flues from multiple appliances can be
combined into a common vent, this special venting system
must be engineered by venting manufacturer and to be
approved by local authority.
•
The Category IV flues from multiple appliances CAN NOT
be combined into a common vent.
•
The Category IV flue must be a dedicated stack.
•
The Category IV Flue appliance must have all vent joints
and seams sealed gas-tight
•
The flue products in the vent system will be cooled below
their dew point and form condensate in the flue and must
use AL29-4C material.
•
The flue from a Category II and IV vent system must have
a condensate drain with provisions to properly collect,
neutralize and dispose of any condensate that may occur.
2.1.4
VENTING GUIDELINES FOR CATEGORY II
AND/OR IV VENTING
•
The installed length of the Positive pressure flue from the
appliance to the point of termination, outside of the
building, must not exceed a maximum of 100
equivalent feet (30.5M) in length. Depending on
diameter and centerline radius subtract from 7 to 19 feet
per 90° elbow using published data. Subtract half this
value for each 45° elbow.
•
For Category IV site conditions exceeding 100 equivalent
feet an engineered vent system approved by the local
authority will be required.
•
The flue may terminate either vertically at the roof top or
horizontally on a THRUWALL. See the information about
the specific vent termination location for recommended
location and clearances.
2.1.5
APPROVED VENTING MATERIALS
Exhaust Vent for Use for DynaFlame® Non-condensing
Category l Installations
1
“B” type.
2
Stainless Steel Single Wall (required when operating
appliance at low fire for long periods).
3
“C” Vent. (Canada ONLY)
4
Equivalent or higher rated than above
Exhaust Vent for Use for DynaFlame® Non-
condensing Category lll Installations
1
Corrosion resistant stainless steel single wall.
2
AL29-4C or equivalent, single or double wall.
Exhaust Vent for Use for DynaFlame® Condensing
Category ll or lV Installations
1
AL29-4Cor equivalent, Single or Double Wall.
2
“BH” type.
Vent material selection for condensing and near
condensing applications
Camus® condensing and near condensing boilers/water
heaters are category II or IV appliances and the exhaust
vent material must be UL/ULC listed for use with category
IV appliances operating under positive pressure in
condensing flue gas service.
Currently, manufactured prefabricated UL/ULC listed vents
of AL29-4C or 316L stainless steel must be used with the
Camus® condensing and near condensing boiler/water
heaters.
When selecting vent material take into consideration that
appliances installed near a corrosive or potentially
corrosive air supply must be isolated from it or they will
suffer damage to the appliance and the venting system.
The corrosion resistance of AL29-4C is typically higher
than that of 316L. Always choose the venting system
which best satisfies the requirements of the application.
This recommendation does not supersede local codes
or the provision of the B149 in Canada or the National
Fuel Gas Code in the United States
Intake Air (Supply Air, or Fresh Air) Piping
1
PVC Non Foam Core Pipe.
2
CPVC (Chlorinated Polyvinyl Chloride).
3
ABS (Acrylonitrile-Butadiene-Styrene).
4
Single wall, galvanized, stainless steel
Single wall vent pipes are to be insulated 5 feet from wall
toward the interior of the building to minimize external
sweating.
2.1.6
VENT TERMINATION CLEARANCES
•
Do not terminate the vent in a window well, stairwell,
alcove, courtyard or other recessed area. The vent
cannot terminate below grade. The bottom of the vent
terminal shall be located at least 12 inches (30cm)
above grade and above normal snow levels. In all
cases the appliance shall be installed in accordance
with local codes.
•
To avoid a blocked flue condition, keep the vent
cap/terminal clear of snow, ice, leaves, debris, etc.
•
Flue gases from this appliance may contain large
amounts of water vapour that will form a white plume
in winter. Plume could obstruct a window view.
•
Flue gas condensate can freeze on exterior walls or
on the vent cap. Frozen condensate on the vent cap
can result in a blocked flue condition. Some
discoloration to exterior building surfaces can be
expected. Adjacent brick or masonry surfaces should
be protected with a rust resistant sheet metal plate.