Camus Hydronics DFH500, Installation, Operation And Service Manual

Page: 11 / 53

8
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. 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 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 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.
2.1.5 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
Exhaust Vent for Use for DynaFlame Non-condensing
Category lll Installations
1 Corrosion resistant stainless steel single wall.
2 Al 294Cor equivalent, single or double wall.
Exhaust Vent for Use for DynaFlame Condensing
Category ll or lV Installations
1 AL294Cor equivalent, Single or Double Wall.
2 “BH” type.
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
5
Single wall,
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.
2.1.7 INLET CAP FOR ROOFTOP TERMINATION
The air inlet cap consists of two 90° elbows installed at the
point of termination for the air inlet pipe. The first 90° elbow
is installed on the rooftop at the highest vertical point of the
air inlet pipe and turned horizontal; the second 90° elbow is
screened and is installed on the horizontal outlet of the first
elbow and turned down. A 90° elbow and a 90° street elbow
may be used to make this assembly. If a straight piece of
pipe is used between the two elbows, it should not exceed
6" (150mm) in length.
2.1.8 LOCATION OF A ROOFTOP AIR INLET AND
VENT CAPS
•
The point of termination for the combustion air inlet cap
MUST be at least 3 feet (0.91M) below the point of flue
gas termination (vent cap) if it is located within a 5 foot
(1.5M) radius of the flue outlet. Use care to ensure that
the 90° elbow assembly is properly installed on the air
inlet pipe.
•
The termination point of the combustion air inlet cap
must be installed at least 3 feet (0.91M) above the
rooftop and above normal snow levels.
•
The vent cap assembly MUST be listed by nationally
recognized agencies.
•
The combustion air cap and vent cap MUST be located
on the same roof top surface and in the same pressure
zone