Camus Hydronics DFH1100 Installation, Operation And Service Manual - page 12
9
•
Combustion air supplied from outdoors must be free of
contaminants. To prevent recirculation of flue products
in to the combustion air inlet, follow all instructions in
this section.
•
Incorrect installation and/or location of the air inlet cap
can allow flue products to be drawn back into the
appliance. This can result in incomplete combustion
and potentially hazardous levels of carbon monoxide in
the flue products. This will cause operational problems
with the appliance and if left uncorrected, will lead to
conditions that can cause personal injury or death.
2.1.9
AIR INLET DAMPER
In warmer climates, during cold weather, the use of ducted
outdoor air may result in the formation of condensation on
the interior panels of the combustion chamber. It may be
possible for this condensation to accumulate and drip out of
the appliance jacket. If this is not acceptable, it is advisable
to install a motorized combustion air damper in the
combustion air duct interlocked with the appliance’s start
circuit. In cold climates it is essential to provide a motorized
air inlet damper to control the supply of combustion air and
prevent nuisance condensation
2.1.10 MASONARY
CHIMNEY
INSULATIONS
Always follow local codes when venting this appliance into
a masonry chimney. A standard masonry chimney must
NOT be used to vent the products of combustion from the
flue of a Condensing, positive or negative pressure
appliance (Category II or IV). If a masonry chimney is to be
used, the chimney MUST use a sealed, metallic, corrosion
resistant liner system to vent flue products from this high
efficiency appliance. Sealed, metallic, corrosion resistant
liner systems (AL29-4C or equivalent, single wall or double-
wall, or flexible or rigid metallic liners) must be rated for use
with a high efficiency condensing, positive pressure vent
system. Corrosion resistant chimney liner systems are
typically made from a high grade of corrosion resistant
stainless steel such as AL29-4C or equivalent. The
corrosion resistant liner must be properly sized and fully
sealed throughout the entire length. If the flue is contained
within the masonry chimney both the top and the bottom of
the masonry chimney must be capped and sealed to
provide a dead air space around the sealed corrosion
resistant metallic liner.
Consult with local code officials to determine code
requirements or the advisability of using a masonry
chimney with a sealed corrosion resistant liner system.
2.1.11 Vertical
Venting Termination
•
Follow Category II or IV vent termination and all
General instructions.
•
The vent terminal should be vertical and exhaust
outside the building at least 2 feet (0.61M) above the
highest point of the roof within a 10 foot (3.05M) radius
of the termination.
•
The vertical termination must be a minimum of 3 feet
(0.91M) above the point of exit.
•
A vertical termination less than 10 feet (3.05M) from a
parapet wall must be a minimum of 2 feet (0.61M)
higher than the parapet wall.
2.1.12
COMBINED COMBUSTION AIR INLET
The air inlet pipes from multiple appliances can be
combined to a single common connection if the common air
inlet pipe has a cross sectional area equal to or larger than
the total area of all air inlet pipes connected to the common
air inlet pipe.
Equivalent pipe diameter = Sq Root [(d
1
)
2
+ (d
2
)
2
+ (d
3
)
2
+
(d
4
)
2
+……+ (d
n
)
2
], d, pipe diameter
Example: What is equivalent pipe diameter of three air
inlet pipes, 8" (20.3 cm), 10” (25.4 cm) and 12” (30.5
cm)
Equivalent pipe diameter = Sq Root [(8)
2
+ (10)
2
+ (12)
2
] =
Sq Root (308) = 17.5”, Select 18” (82.8 cm) diameter pipe
or larger.
The air inlet point for multiple boiler air inlets must be
provided with an exterior opening which has a free area
equal to or greater than the total area of all air inlet pipes
connected to the common air inlet. This exterior opening for
combustion air must connect directly to the outdoors. The
total length of the combined air inlet pipe must not exceed a
maximum of 100” (30.5M) equivalent feet. You must deduct
the restriction in area provided by any screens, grills or
louvers installed in the common air inlet point. Screens,
grills or louvers installed in the common air inlet can reduce
the free area of the opening from 25% to 75% based on the
materials used. Calculate and compensate accordingly for
the restriction.
2.1.13 DRAIN
TEE
Figure 2 – Drain “T” and Neutralizer Cartridge
Installation
A drain tee MUST be installed in the Condensingvent pipe
to collect and dispose of any condensate that may occur in
the vent system. The drain tee should be installed at the
point where the flue turns vertical for a roof top termination
or as one of the first fittings in a horizontal flue that will
terminate on a THRUWALL. Ensure that horizontal portions
of the vent are properly sloped to allow condensate to be
evacuated at the drain tee. Plastic drain tubing, sized per
the vent manufacturer’s instructions, shall be provided as a
drain line from the tee. The drain tubing must have a trap
provided by a 4" (10cm)-diameter circular trap loop in the
drain tubing. Prime the trap loop by pouring a small quantity
of water into the drain hose before assembly to the vent.
Secure the trap loop in position with nylon ties. Use caution
not to collapse or restrict the condensate drain line with the
nylon wire ties. The condensate drain must be routed to the