FULTON Vantage VTG Series Installation And Operation Manual page 40

INSTALLATION
2. Vantage boilers are not approved for venting with
other equipment. Examples include steam boilers,
water heaters, generators, and other types of Fulton
equipment.
3. A constant diameter common header is recommended.
Do not use the static regain method.
4. A minimum 1/4" rise per foot run is required for
horizontal sections.
5. Where individual stacks transition into the common
header, a 45 degree reducing tee or elbow in the
direction of flow is recommended. Straight-in or 90
degree tees must not be used.
When designing a draft system for a quantity of two or more
Vantage boilers, the following items must be considered
and addressed by the parties responsible for designing and
providing that system:
` COMMON VENTING EXHAUST BACKFLOW PREVENTION
1. When combining the exhaust vents of multiple Vantage
boilers, the system must be designed to guarantee
flue gas and exhaust will not backflow through an idle
boiler. This generally requires appropriately sizing the
common exhaust vent to maintain a slight negative
draft pressure throughout all operating conditions.
Alternative solutions may be considered provided
the solutions to prevent flue gas recirculation (FGR),
exhaust backflow, and unacceptable draft pressures
have been thoroughly evaluated by the venting
designer and supplier.
Recommended
2-34
2. Supplying combustion air with individually piped
intake vents or neutral pressure boiler room air is
recommended when venting into a common exhaust
system. For common exhaust vent applications where
combustion air intake (CAI) vents are also combined
into a common pipe, it is necessary to size the common
CAI pipe for a negligible pressure loss from the common
intake termination to the individual intake pipe.
3. Precautions must be taken to ensure that the draft
pressure at each boiler is maintained within in the
required range (refer to Table 5) throughout all
conditions while also maintaining a slight negative
draft pressure in the common exhaust header. Consider
all possible operating conditions of the exhaust system
specific to the application, including:
ƒ Low and high flue gas temperatures
ƒ Low and high ambient air temperatures
ƒ All boilers operating at their maximum input
ƒ One boiler in the system operating at the low fire
ƒ No boilers on, pre-purge and ignition
4. Consider the natural draft effects associated with
vertical exhaust vent rise. Over-draft control accessories,
such as modulating stainless steel dampers, may
be required depending on the variety of conditions
experienced in the draft system. Conversely, an
FIGURE 18 - EXHAUST VENT CONNECTION
VTG-IOM-2016-1214
rating capacity
position
Not Recommended
SECTION 2
© The Fulton Companies 2016