Venting Guidelines For Category Iand/Or Iii Venting; Category Ii And Category Iv Venting; Venting Guidelines For Category Ii And/Or Iv Venting; Approved Venting Materials - Camus Hydronics DynaFlame DFW501 Installation, Operation And Service Manual

2.1.2 VENTING GUIDELINES FOR CATEGORY I
AND/OR III 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 (30.5 m) in length. Depending on
diameter and centreline radius subtract from 7 to 19
feet per 90° elbow using published data.
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 IV venting system for the flue products is
required on all condensing models (DynaFlame with
CHRM).
A Category II venting system operates with a negative
pressure in the vent.
The Category IV venting system operates with positive
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 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 h alf
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.
2.1.5

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.
4 Equivalent or higher rated than above
9
Exhaust Vent for Use for DynaFlame Non-condensing
Category lll Installations
1
2
Exhaust Vent for Use for DynaFlame Condensing
Category ll or lV Installations
1
Subtract half 2
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
2
3
4
5
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
•
•
•
•
Corrosion resistant stainless steel single wall.
AL29-4C or equivalent, single or double wall.
AL29-4Cor equivalent, Single or Double Wall.
"BH" type.
PVC Non Foam Core Pipe.
CPVC (Chlorinated Polyvinyl Chloride).
ABS (Acrylonitrile-Butadiene-Styrene).
Single wall, galvanized
Single wall, Stainless Steel

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.