Camus Hydronics DFH/W1100 Installation, Operation And Service Manual - page 17
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2.2.1
AIR REQUIRED FOR COMBUSTION AND
VENTILATION
Provisions for combustion and ventilation air are to be in
accordance with the section for “Air for Combustion and
Ventilation”, of the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, or clause 8.2, 8.3, 8.4 of “Natural Gas and
Propane Installation Code”, CAN/CSA B149.1.2, or applicable
provisions of the local building codes.
If air is taken directly from outside the building with no duct,
provide two permanent openings:
a) Ventilation of the space occupied by fuel burning
appliance(s) or equipment shall be supplied by a
ventilation opening at the highest practicable point
communicating with the outdoors. The total cross sectional
area of the ventilation opening must be either 10% of the
net free area required for combustion air or 10 sq. in (6500
mm
2
), whichever is greater.
b) Net free area of combustion air opening shall be in
accordance with all applicable codes. In the absence of
such codes provide combustion air opening with a
minimum free area of one square inch per 7,000 Btuh
input (5.5 cm per kW) up to 1,000,000 Btuh and one
square inch per 14,000 Btuh in excess of 1,000,000 Btuh.
This opening must be ducted no higher than 18” nor less
than 6” above the floor.
c) In extremely cold climates when air supply is provided by
natural air flow from the outdoors we recommend sizing
the combustion air supply opening with a minimum free
area of not less than one square inch per 30,000 Btu/hr, of
the total rated input of the burner, provided that this does
not conflict with local codes. This opening is in addition to
the ventilation opening defined in paragraph a) above.
NOTE
Outside air openings shall directly communicate with the
outdoors.
CAUTION
Under no circumstances should the mechanical room ever
be under a negative pressure. Particular care should be
taken where exhaust fan, attic fans, clothes dryers,
compressors, air handling units, etc., may take away air
from the unit.
2.2.2
EXHAUST FANS
Any fan or equipment which exhausts air from the equipment
room may deplete the combustion air supply and/or cause a
downdraft in the venting system through a barometric damper
if installed. Spillage of flue products from the venting system
into an occupied living space can cause a very hazardous
condition that must be immediately corrected.
2.3
OUTDOOR VENTING
The DynaFlame® windproof cabinet protects the unit from
weather, when fitted with the factory supplied air intake and UL
approved vent cap (93-0298), it will be self-venting and
suitable for outdoor installation.
1. Outdoor models must be installed outdoors and must use
the Air Intake and Vent Cap supplied by Camus®
Hydronics.
2. Periodically check to ensure that air intake and vent cap
are not obstructed.
3. Locate appliance at least 3 feet away from any overhang.
4. Locate appliance at least ten feet from building air intake.
5. Avoid installation in areas where runoff from adjacent
building can spill onto appliance.
For outdoor installations, always consider the use of a
shelter such as a garden shed in lieu of direct exposure of
the appliance to the elements. The additional protection
afforded by the shelter will help to minimize nuisance
problems with electrical connections and will allow easier
servicing of the appliance under severe weather
conditions.
2.4
THRUWALL VENTING
When fitted with the factory supplied vent terminal, the
DynaFlame® can vent up to 100 equivalent feet. Elbows
can range from 7 to 19 feet in equivalent length depending
on centreline radius. Refer to table 4 for vent sizes.
Appliances may be installed with either a horizontal
sidewall vent or vertical roof top vent. Terminals differ with
each application. Horizontal lengths over 5 feet must be
installed using corrosion resistant stainless steel. Use
single wall vent and seal all joints or use pressure rated
double wall vent.
When using single wall vent, all vent connector seams and
joints must be sealed with pressure sensitive aluminium
tape or silicone sealant as specified by the vent
manufacturer. Aluminium tape must meet the provisions of
SMACNA AFTS-100-73 Standard.
When venting through unheated spaces, use venting
material which will minimize flue gas condensation inside
the vent. Provisions must be made for collecting and
disposing of any condensation which may occur. The
authorities having jurisdiction must approve venting.
Periodically check to ensure that the vent terminal is
unobstructed.
This venting system uses the appliance’s internal
combustion air fan to force the flue products out
horizontally. Vent cap and venting must be listed type
Category IV vent materials.
The DynaFlame® fan generates a positive pressure in the
flue. Combustion air is drawn from the equipment room
The THRUWALL termination caps are available from the
factory as a kit. Refer to local codes for proper installation
and location of vent terminals.
2.4.1
THRUWALL VENT CAP (14-0090) THRUWALL
INTAKE AIR CAP (14-0101)
•
The THRUWALL vent cap kit includes the wall
penetration assembly and the discharge screen
assembly.
•
The opening through the wall for installation of the
THRUWALL vent cap must provide an air space
clearance of 1 inch (2.5cm) around the flue pipe. The
diameter of the opening for installation of the
THRUWALL vent cap will be 2 inches (5cm) larger
than the nominal diameter of the installed vent pipe to
the THRUWALL vent cap. The diameter of the
opening for the air inlet cap will be the same as the
nominal size of the pipe.
•
Install the proper vent pipe to the vent cap (provided
by Camus® Hydronics).
•
Follow all requirements in the General Venting
sections for venting flue products to the outdoors.